TECHNICAL FIELD

The utility model relates to the technical field of mechanical parts, in particular to a rotation auxiliary mechanism and a fastening device.

DESCRIPTION OF RELATED ART

Existing rotating components generally use a spring to achieve force balance. However, the rotating components are directly connected to the spring, and when the rotating components rotate or cooperate with other moving components, the rotating components and the moving components will come into contact with the spring, which, over time, will cause the spring to wear out and fail, damage the spring and reduce the spring force, leading to system failure.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems in the prior art, the object of the present utility model is to provide a rotation auxiliary mechanism, which can prevent a spring from contacting with other components while ensuring force balance, which reduces spring wear, and increases service life of the spring.

A first aspect of the present utility model provides a rotation auxiliary mechanism, including: a mounting base being movably connected with a rotary arm; an elastic assembly arranged on both sides of the rotary arm and including an elastic member and a movable member connected to one end of the elastic member, the other end of the elastic member being fixed, an end of the movable member away from the elastic member abutting against the rotary arm, when the rotary arm oscillates, the elastic member can be compressed by the movable member to retain the rotary arm, and when an external force applied to the rotary arm is removed, the elastic member drives the rotary arm oscillating to a predetermined position to reset.

In some embodiments, an inside wall of the mounting base is provided with a groove for installing the elastic assembly, the elastic assembly is accommodated in the groove, and the movable member is slidably installed in the groove.

In some embodiments, one end of the rotary arm extends along its radial direction to form an abutment portion that abuts against the movable member, and the abutment portion is located in the groove.

]In some embodiments, one end of the groove away from the abutment portion is closed to fix the other end of the elastic member.

In some embodiments, the abutment portion is inclined outward by a first angle based on the normal line of the outer wall of the rotary arm, and a closed end wall of the groove away from the one end of the abutment portion is inclined outward by a second angle based on the normal line of the outer wall of the rotary arm.

In some embodiments, the elastic assembly further includes a guiding mechanism, the other end of the elastic member is sleeved on the guiding mechanism and abuts against the guiding mechanism, the guiding rod of the guiding mechanism faces toward the movable member, and there is a gap between the guiding rod and the movable member. In some embodiments, the elastic assembly further includes a fixing plate provided at an end of the guiding mechanism to fix the guiding mechanism.

In some embodiments, the movable member is a bearing ball.

In some embodiments, a side wall of the rotary arm is recessed inward to form a notch at a position corresponding to the elastic assembly, so that there is a gap between the side wall of the rotary arm and the side wall of the elastic member.

A second aspect of the present utility model provides a fastening device including a feeding mechanism and a propulsion mechanism, the fastening device further including the above rotation auxiliary mechanism, the feeding mechanism includes the rotary arm with through holes passing through both ends thereof to form a feeding channel, the action of the propulsion mechanism can fasten a fastener to the target position after the fastener is transported to the target position through the feeding channel, and the movement of the propulsion mechanism toward the target position can push the rotary arm to oscillate.

Compare to prior art, the rotation auxiliary mechanism provided by the embodiment of the present utility model has the following effects: by arranging the elastic assemblies on both sides of the rotary arm, the elastic member of the elastic assembly is movably connected with the rotary arm via the movable member to transmit force, the elastic force generated by the compression of the elastic member can be used to apply a retaining force to the rotary arm after the rotary arm oscillates to the predetermined position so as to keep the rotary arm in the oscillating position, and at the same time, the above elastic force can also be used to force the rotary arm to reset; and the elastic member can be moved away from the rotary arm under the elastic force, thus effectively avoiding the contact of the rotary arm with the elastic member during the oscillation of the rotary arm, preventing the elastic member from wear, and improving the service life of the elastic member and the product. In addition, in the embodiment of the present utility model, an inclined action surface is provided to transmit elastic force, so that the elastic member is away from the rotary arm when the rotary arm oscillates, avoiding contact wear between the elastic member and the rotary arm, and further improving the service life of the elastic member.

BRIEF DESCRIPTION OF THE DRAWINGS

In figures that are not necessarily drawn to scale, the same reference signs may describe similar components in different figures. The same reference signs with suffixes or different suffixes may denote different examples of similar components. The figures generally show various embodiments by way of example rather than limitation, and are used together with the description and claims to describe the embodiments of the utility model. When appropriate, the same reference signs are used in all figures to refer to the same or similar parts. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present device or method.

FIG. 1 is a structural schematic view of the rotation auxiliary mechanism of an embodiment of the present utility model; FIG. 2 is a structural schematic view of the rotation auxiliary mechanism of the embodiment of the present utility model (without a side wall);

FIG. 3 is another structural schematic view of the rotation auxiliary mechanism of the embodiment of the present utility model;

FIG. 4 is a structural schematic view of an elastic assembly of the rotation auxiliary mechanism of the embodiment of the present utility model;

FIG. 5 is a partial sectional view of the rotation auxiliary mechanism in FIG. 1;

FIG. 6 is a structural schematic view of a fastening device of the embodiment of the present utility mode.

Reference signs:

1-mounting base, 11-mounting portion, 12-side wall, 13-groove, 131-end wall; 2-rotary arm, 21-abutment portion, 211-contact surface, 22-outer wall, 23-notch; 3-elastic assembly, 31-elastic member, 32-movable member, 33-guiding mechanism, 34-fixing plate; 10-feeding mechanism, 20-propulsion mechanism.

DETAILED DESCRIPTION OF EMBODIMENTS

In order to make the object, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be described clearly and completely in conjunction with the accompanying drawings of the embodiments of the present utility model.

Unless otherwise defined, technical terms or scientific terms used in the present utility model shall be usual meanings understood by those ordinary skilled in the art to which the present utility model belongs. "First", "second" and similar words used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and other similar words means that an element or item appearing before this word covers an element or item listed after this word and its equivalents, but does not exclude other elements or items. "Connected" or "coupled" and other similar words is not limited to physical or mechanical connection, but may include electrical connection, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate the relative position relationship. When the absolute position of a described object changes, the relative position relationship may also change accordingly.

In order to keep the following description of the embodiments of the present utility model clear and concise, detailed descriptions of known functions and known components are omitted in the present utility model.

FIGS. 1-5 are structural schematic diagrams of the rotation auxiliary mechanism of the embodiment of the present utility model. As shown in FIGS. 1-5, the embodiment of the present utility model provides a rotation auxiliary mechanism, including: a mounting base 1 being movably connected with a rotary arm 2; an elastic assembly 3 arranged on both sides of the rotary arm 2 and including an elastic member 31 and a movable member 32 connected to one end of the elastic member 31, the other end of the elastic member 31 being fixed, an end of the movable member away from the elastic member 31 abutting against the rotary arm 2, when the rotary arm 2 oscillates, the elastic member 31 can be compressed by the movable member 32 to retain the rotary arm 2, and when an external force applied to the rotary arm 2 is removed, the elastic member 31 drives the rotary arm 2 oscillating to a predetermined position to reset.

When the rotary arm 2 oscillates to the predetermined position in a first direction (for example, clockwise) under the external force, the rotary arm 2 acts on the movable member 32, the movable member 32 compresses the elastic member 31 after being forced, and an elastic force generated by the elastic member 31 reacts to the rotary arm 2 via the movable member 32, such that the external force applied to the rotary arm 2 and the elastic force generated by the elastic member 31 are in a balanced state, causing the rotary arm 2 to be retained at the predetermined position; and when the external force applied to the rotary arm 2 is removed, the elastic force of the elastic member 31 is released, and the rotary arm 2 reversely oscillates and is reset by the movable member 32, so as to return to an initial position.

The above-mentioned predetermined position is the maximum oscillating position of the rotary arm 2, and at this time, the elastic member 31 has the maximum compression amount.When the swivel arm 2 oscillates to the maximum oscillating position, although the swivel arm 2 can continue oscillating, the elastic member 31 cannot provide enough retaining force for the swivel arm 2 after it continues oscillating because the compression amount of the elastic member 31 has reached the maximum, then the rotary arm 2 will oscillate in the opposite direction and return to the maximum swing position. The above-mentioned predetermined position can also be any position between the initial position and the maximum oscillating position of the rotary arm 2, and within such a oscillating range, the external force applied to the rotary arm 2 and the elastic force generated by the elastic member 31 are always in the balanced state, so that the rotary arm 2 is retained in the oscillating position.

The rotation auxiliary mechanism provided by the embodiment of the present utility model has the following effects: by arranging the elastic assemblies 3 on both sides of the rotary arm 2, the elastic member 31 of the elastic assembly 3 is movably connected with the rotary arm 2 via the movable member 32 to transmit force, the elastic force generated by the compression of the elastic member 31 can be used to apply a retaining force to the rotary arm 2 after it oscillates to the predetermined position so as to keep the rotary arm 2 in the oscillating position, and at the same time, the above elastic force can also be used to force the rotary arm 2 to reset; and the elastic member 31 can be moved away from the rotary arm 2 under the elastic force, thus effectively avoiding the contact of the rotary arm 2 with the elastic member 31 during the oscillation of the rotary arm 2, preventing the elastic member 31 from wear, and improving the service life of the elastic member 31 and the product. That is, the elastic assembly 3 of the rotation auxiliary mechanism can not only interact with the rotary arm 2 through its end, but also can avoid contact with the rotary arm 2.

The rotary arm 2 is rotatably connected to the mounting base 1 via a hinge 4, and can oscillate around a central axis of the hinge 4 under a force, wherein the central axis is the oscillating center of the rotary arm 2. As shown in FIGS. 1-3, the mounting base 1 has a generally U- shaped profile, and includes a mounting portion 11 for mounting the rotary arm 2 as well as two side walls 12 extending perpendicular to the end surface of the mounting portion 11. The two side walls

12 are substantially parallel, which facilitates the rotation of the arm 2 on the one hand, and facilitates the installation of the elastic assembly 3 on the other hand. When the rotary arm 2 is in a stationary state (a free state without oscillation), the central axis of the rotary arm 2 is parallel to the central axis of the U- shaped profile.

An inside wall of the mounting base 1 is provided with a groove

13 for installing the elastic assembly 3. The elastic assembly 3 is accommodated in the groove 13 and the movable member 32 is slidably installed in the groove 13. The groove 13 is arranged along the length direction of the inside wall.

In a preferred embodiment, the side wall 12 of the mounting base

I is an arc-shaped side wall and the groove 13 is an arc-shaped groove, which facilitates the movement of the elastic assembly 3 within the groove 13, reduces the contact between the elastic assembly 3 and the side wall of the groove 13, and reduces the wear of the elastic assembly 3.

The mounting part 11 and the two side walls 12 of the U-shaped structure can be integrally formed. For example, the mounting part

II and the two side walls 12 can be formed by cutting a U-shaped opening into a circular sleeve.

The end of the rotary arm 2 close to its ocsillating center extends along its radial direction to form an abutment portion 21 that abuts against the movable member 32, and the abutment portion 21 is located in the groove 13 so that the abutment portion 21 directly abuts against the movable member 32.

As shown in FIG. 5, the abutment portion 21 is an annular abutment part, is formed by extending outward from the outer wall 22 of the rotary arm 2 in the radial direction thereof, and is inclined outward by a first angle a based on the normal line of the outer wall 22. When the elastic force Figenerated by the compression of the elastic member 31 acts on the movable member 32, since the abutment portion 21 has an inclined contact surface 211, the force transmitted to the abutting portion 21 through the movable member 32 has a component force F2 toward the radially outside of the rotary arm 2, enables the elastic member 31 to be away from the movable rotary arm 2 to prevent the two from contact.

One end of the groove 13 away from the abutment portion 21 is closed to fix the other end (the end away from the movable member 32) of the elastic member 31. That is, in the groove 13, the elastic member 31, the movable member 32 and the abutting portion 21 are connected in sequence starting from the closed end wall 131, so that the elastic member 31 and the movable member 32 are restricted between the end wall 131 and the abutment portion 21. In this embodiment, the elastic member 31 abuts against the end wall 131, which enables the elastic member 31 and the end wall 131 to interact with each other while fixing the end of the elastic member 31 away from the movable member 32.

As shown in FIG. 5, the end wall 131 is inclined outward by a second angle b based on the normal line of the outer wall 22 to facilitate the transmission of force. Similar to the effect of the first angle a described above, when the elastic force FI generated by the compression of the elastic member 31 acts on the end wall 131 in the other direction, since the end wall 131 has an inclined contact surface, the force transmitted to the end wall 131 has a component force F ₃ toward the radially outside of the rotary arm 2, which enables the elastic member 31 to be away from the movable rotary arm 2.

The cooperation of the inclined abutment portion 21 and the inclined end wall 131 causes the two ends of the elastic member 31 to be away from the rotary arm 2 when the rotary arm 2 oscillates, so as to prevent the elastic member 31 from being contact wear with the rotary arm 2.

Since the abutment portion 21 is close to the oscillating center of the rotary arm 2 and the end wall 131 is far away from the oscillating center, when the rotary arm 2 oscillates, the rotary arm 2 oscillates with a larger oscillating amplitude at a position close to the end wall 131 and it is not easy to contact with the elastic member 31. Therefore, the first angle a is greater than the second angle b to ensure that the elastic member 31 does not contact with the outer wall 22 of the rotary arm 2 at a position close to the abutment part 21. The first angle a and the second angle b cannot be set too large, so as to prevent failing to provide sufficient radial component force for resetting the rotary arm 2. The first angle a and the second angle b are preferably 1-15°. For example, the first angle a may be 10°, and the second angle b may be 4 ⁰ . In a specific embodiment, the first angle a and the second angle b are determined according to actual condition such as the size of the elastic member 31, and is not specifically limited by the present utility model. In some embodiments, the elastic assembly 3 may further include a guiding mechanism 33. The other end (the end away from the movable member 32) of the elastic member 31 is sleeved on the guiding mechanism 33 and abuts against the guiding mechanism 33. The guiding rod of the guiding mechanism 33 faces toward the movable member 32, and there is a certain gap between the guiding rod and the movable member 32, so that the elastic member 31 has a certain expansion space.

As shown in FIG. 2, the elastic member 31 may be a spring that can be sleeved on the outer circumference of the guiding mechanism 33; as shown in FIGS. 3 and 4, the elastic member 31 may also be an elastic sleeve that can be sleeved on the outer circumference of the guiding mechanism 33. Since the spring is characterized by easy deformation, large elasticity, light weight, etc, in a specific embodiment, the elastic member 31 is preferably a spring such as a coil spring or an R-shaped spring. In other embodiments, the elastic member 31 may also be an elastic entity, which is not specifically limited by the present utility model, and the guiding mechanism 33 is inserted through the elastic entity in its axial direction.

When the elastic member 31 (such as a spring) is sleeved on the guiding mechanism 33, the elastic member 31 abuts against an end of the guiding mechanism 33 to limit the end of the elastic member 31 away from the movable member 32.

As shown in FIGS. 3-5, the elastic assembly 3 may further include a fixing plate 34 provided at an end of the guiding mechanism 33 to fix the guiding mechanism 33, thereby fixing the other end of the elastic member 31. That is, the fixing plate 34 can function to close the end wall 131 of the groove 13, and is inclined outward by the second angle b based on the normal line of the outer wall 22 of the rotary arm 2 to transmit force. By arranging the independent fixing plate 34 and the guiding mechanism 33 with an end, the elastic member 31 and the movable member 32 can be installed from the axial direction of the mounting base 1, so as to facilitate disassembly and assembly without affecting the rotary arm 2. In addition, the cooperation of the guiding mechanism 33 and the movable member 32 can ensure that the elastic member 31 does not contact with the mounting base 1, thereby further reducing the wear of the elastic member 31.

As shown in FIGS. 2, 4, and 5, the movable member 32 is a bearing ball slidably arranged in the groove 13, which can not only act on the elastic member 31, but also make rolling contact with the abutment part 21, and transmits the elastic force of the elastic member 31 to the rotary arm 2. The abutment portion 21 has a contact surface 211 that cooperates with the movable member 32, and when the bearing ball interacts with the contact surface 211 via point-to- surface contact, the bearing ball can move relative to the contact surface 211, thereby ensuring the reliability of force transmission, and only a small amount of force is required to transmit force when interacting, which helps to keep the elastic member 31 away from the rotary arm 2. In addition, the movable member 32 can ensure that the elastic member 31 remains straight and has a definite contact point.

The side wall (outer wall 22) of the rotary arm 2 is recessed inward to form a notch 23 (recess) at a position corresponding to the elastic assembly 3, so that there is a gap between the side wall of the rotary arm 2 and the side wall of the elastic member 31, thereby preventing the elastic member 31 from contacting with the rotary arm 2 when the rotary arm 2 oscillates. That is, the oscillation of the rotary arm 2 will not affect the elastic member 31, thus reducing the wear of the elastic member 31. Since the elastic assembly 3 is installed inside the mounting base 1, other components will not affect the elastic assembly 31.

In some embodiments, it is also possible to adjust the radial size of the groove 13 extending inward from the inside wall of the mounting base 1 so that there is a gap between the side wall of the rotary arm 2 and the side wall of the elastic member 31. For example, the radial size of the elastic member 31 can be set to be smaller than that of the groove 13 to prevent the elastic member 31 from contacting with the rotary arm 2.

Fig. 6 is a structural schematic diagram of the fastening device of the embodiment of the present utility model. As shown in FIG. 6, the embodiment of the present utility model also provides a fastening device, which includes a feeding mechanism 10, a propulsion mechanism 20, and the aforementioned rotation auxiliary mechanism. The feeding mechanism 10 includes a rotary arm 2 with through holes passing through both ends thereof to form a feeding channel. After a fastener is transported to the target position through the feeding channel, the action of the propulsion mechanism 20 can fasten the fastener to the target position, and the movement of the propulsion mechanism 20 toward the target position can push the rotary arm 2 to oscillating.

When the propulsion mechanism 20 advances toward the target position and pushes the rotary arm 2 to oscillate to the predetermined position, the rotary arm 2 oscillating to the predetermined position closes the feeding channel to prevent other fasteners from falling into the target position. The propulsion mechanism 20 acts on the fastener transported to the target position such that the fastener can be quickly assembled and tightened; after the fastener is tightened, the propulsion mechanism 20 retreats, so that the external force applied to the rotary arm 2 is removed, the rotary arm 2 is reset under the action of the elastic assembly 3 and return to the initial position, the feeding channel communicates with the target position to transport the next fastener to the target position and thus to facilitate the tightening and installation of the next fastener. As the wear of the elastic member 31 is reduced, the rotary arm 2 can be retained in place, which improves the reliability of the fastening device.

As shown in FIG. 6, the mounting base 1 is arranged obliquely with respect to the propulsion mechanism 20, and when the rotary arm 2 is reset, the center axis of the rotary arm 2 is parallel to the center axis of the elastic assembly 3, and the position when the rotary arm 2 is reset is the initial position of the rotary arm 2. In this way, the rotary arm 2 can be retained in a proper position so as to prevent it from contacting with the elastic assembly 3 and facilitate to a beautiful appearance.

The above embodiments are only exemplary embodiments of the present utility model, and are not used to limit the present utility model. The scope of protection of the utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the utility model within the essence and protection scope of the utility model, and such modifications or equivalent substitutions should also be regarded as falling within the protection scope of the utility model.