[0001] The present invention relates to the field of electronic scales, and in particular to a weighing sensor assembly and a dynamic automatic checkweigher comprising same.

[0002] In the prior art, a dynamic automatic checkweigher is mainly composed of a tabletop assembly, a driving assembly, a sensor assembly, an electric cabinet, a tabletop supporting assembly and a machine frame. The apparatus is mainly used on a production line to detect whether the weight of product is qualified, i.e. , whether the weight of product is within the corresponding range of precision, and determine unaccepted products by means of the identification of weight by the system and deal with the unaccepted products.

[0003] At present, the dynamic automatic checkweigher with such a structure has the following deficiencies:

I. a strain gauge sensor is limited by its own structure, and cannot solve the stress interference to the sensor caused by internal stress of an electric motor cable;

II. the strain gauge sensor is usually of an external type and is easy to adhere to dust or other tiny impurities, such that the sensor will be interfered for the weighing after a long time, and even fail to normally weigh and calibrate the weight; and

III. the electric motor cable is usually fixed at a certain position, so the assembly process cannot be fixed, and the assembly technique also affects the cable.

[0004] In view of this, those skilled in the art would have improved the structure of the strain gauge sensor in order to overcome the foregoing technical problems.

[0005] The technical problem to be solved by the present invention is to provide a weighing sensor assembly and a dynamic automatic checkweigher comprising same, in order to overcome the deficiencies that a dynamic automatic checkweigher in the prior art cannot solve the stress interference to a sensor and is easy to adhere to dust or other tiny impurities, and the assembly process cannot be fixed.

[0006] The present invention solves the above technical problem through the following technical solution:

[0007] a weighing sensor assembly, comprising a sensor upper support plate, a separate housing, a weighing sensor, a sensor lower support plate and an electric motor cable, wherein an upper end of the separate housing is fixedly connected to the sensor upper support plate, a lower end of the separate housing is fixedly connected to the sensor lower support plate, and the weighing sensor is fixed in the separate housing; an upper portion of one end of the weighing sensor is connected to the sensor upper support plate, and a lower portion of the other end thereof is connected to the sensor lower support plate; and the electric motor cable penetrates into an upper portion of the separate housing and penetrates out of a lower portion thereof, the part of the electric motor cable located in the separate housing is a separate cable, and a gap exists between the separate cable and the weighing sensor and makes the two separated.

[0008] According to an embodiment of the present invention, the separate housing comprises an upper separate housing and a lower separate housing, the upper separate housing is fixedly connected to the sensor upper support plate, the lower separate housing is fixedly connected to the sensor lower support plate, and the upper separate housing and the lower separate housing are connected in a vertical butt joint to form a closed cavity structure.

[0009] According to an embodiment of the present invention, an upper end face of the upper separate housing is provided with a mounting slot located directly above the weighing sensor; and the upper portion of one end of the weighing sensor is provided with a first sensor gasket connected to the sensor upper support plate.

[0010] According to an embodiment of the present invention, the lower separate housing encloses an outer side face of the sensor lower support plate, and the lower portion of the other end of the weighing sensor is provided with a second sensor gasket connected to the sensor lower support plate.

[0011] According to an embodiment of the present invention, the upper separate housing is enclosed by an upper end face, a first group of front and rear surfaces, and a first side face to form an open housing structure, the lower separate housing is enclosed by a top surface, a second group of front and rear surfaces, and a second side face to form an open housing structure, and the upper separate housing is connected to the lower separate housing in a vertical cover-fit manner.

[0012] According to an embodiment of the present invention, the second group of front and rear surfaces of the lower separate housing are trapezoidal surfaces, and the top surface is connected between the second group of front and rear surfaces; the junctions of the second group of front and rear surfaces and the top surface are provided with a clamping slot; and the width of the upper separate housing is greater than or equal to that of the lower separate housing, the upper separate housing covers outside the lower separate housing, and the upper end face of the upper separate housing is clamped in the corresponding clamping slot.

[0013] According to an embodiment of the present invention, the upper portion of the upper separate housing is provided with a first cable clamping device, the lower portion of the lower separate housing is provided with a second cable clamping device, and the electric motor cable penetrates into the first cable clamping device and penetrates out of the second cable clamping device; and an initial segment electric motor cable of the electric motor cable is located outside the first cable clamping device, and a final segment electric motor cable of the electric motor cable is located outside the second cable clamping device.

[0014] According to an embodiment of the present invention, the lower separate housing is further provided with a third cable clamping device, and a sensor cable of the weighing sensor penetrates out of the third cable clamping device.

[0015] According to an embodiment of the present invention, an upper portion of an inner wall of the separate housing is provided with at least one positioning member, by which the separate cable is fixed in the separate housing.

[0016] The present invention further provides a dynamic automatic checkweigher, characterized by comprising the foregoing weighing sensor assembly.

[0017] The positive improvement effects of the present invention are as follows: for the weighing sensor assembly and the dynamic automatic checkweigher comprising same according to the present invention, a new sensor housing structure is used, and with the embedded housing structure design, the interference of environmental factors such as external dust and airflow on the sensor is reduced, and the level of protection of the sensor is improved. Moreover, the components of sensor are also easier to maintain.

With the separate housing connection mode, the interferences to a final segment cable caused by the internal stress of an electric motor cable itself and the external stress are isolated, which reduces the interference to the weighing detection caused by the internal stress of the electric motor cable and an external cable, thus greatly improving the static weighing performance and the stability of dynamic weighing precision of the sensor.

[0018] The above and other features, properties and advantages of the present invention will become clearer based on the description below in conjunction with the accompanying drawings and embodiments, and the same reference numerals in the figures always represent the same features, in which:

Fig. 1 is a first exploded schematic diagram of a weighing sensor assembly according to the present invention;

Fig. 2 is a second exploded schematic diagram of the weighing sensor assembly according to the present invention;

Fig. 3 is an exploded front view of the weighing sensor assembly according to the present invention;

Fig. 4 is an exploded side view of the weighing sensor assembly according to the present invention;

Fig. 5 is a structural schematic diagram of an upper separate housing in the weighing sensor assembly according to the present invention;

Fig. 6 is a structural schematic diagram of a lower separate housing in the weighing sensor assembly according to the present invention;

Fig. 7 is an exploded top view of the weighing sensor assembly according to the present invention;

Fig. 8 is a front view of the weighing sensor assembly according to the present invention after being assembled;

Fig. 9 is a structural schematic diagram of a dynamic automatic checkweigher according to the present invention;

Fig. 10 is a schematic diagram of installation of a weighing sensor in the dynamic automatic checkweigher according to the present invention.

[0019] To make the above objectives, features and advantages of the present invention more apparent and easier to understand, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The same reference numerals used in the accompanying drawings denote identical or similar parts wherever possible. [0021] Furthermore, although the terms used in the present invention are selected from well- known common terms, some of the terms mentioned in the description of the present invention may have been selected by the applicant according to his or her determination, and the detailed meaning thereof is described in the relevant section described herein.

[0022] Furthermore, the present invention must be understood, not simply by the actual terms used but also by the meanings encompassed by each term.

[0023] FIG. 1 is a first exploded schematic diagram of a weighing sensor assembly according to the present invention. FIG. 2 is a second exploded schematic diagram of the weighing sensor assembly according to the present invention. FIG. 3 is an exploded front view of the weighing sensor assembly according to the present invention. FIG. 4 is an exploded side view of the weighing sensor assembly according to the present invention. FIG. 5 is a structural schematic diagram of an upper separate housing in the weighing sensor assembly according to the present invention. FIG. 6 is a structural schematic diagram of a lower separate housing in the weighing sensor assembly according to the present invention. FIG. 7 is an exploded top view of the weighing sensor assembly according to the present invention.

[0024] As shown in FIGS. 1 to 7, the present invention discloses a weighing sensor assembly, which comprises a sensor upper support plate 10, a separate housing, a weighing sensor 20, a sensor lower support plate 30, and an electric motor cable 40. An upper end of the separate housing is fixedly connected to the sensor upper support plate 10; a lower end of the separate housing is fixedly connected to the sensor lower support plate 30, and the weighing sensor 20 is fixed in the separate housing. An upper portion of one end of the weighing sensor 20 is connected to the sensor upper support plate 10, and a lower portion of the other end thereof is connected to the sensor lower support plate 30. The electric motor cable 40 penetrates into an upper portion of the separate housing and penetrates out of a lower portion thereof, the part of the electric motor cable 40 located in the separate housing is a separate cable 41 , and a gap exists between the separate cable 41 and the weighing sensor 20 and makes the two separated.

[0025] Certainly, in order to further ensure that the separate cable 41 is in no contact with the weighing sensor 20 to avoid interference, preferably, an upper portion of an inner wall of the separate housing can be provided with at least one positioning member, by which and the separate cable 41 is fixed in the separate housing (not shown). Herein, the separate cable 41 is formed by peeling the electric motor cable 40 and is loosely mounted in the separate housing, which can reduce the interference between cables. The separate cable 41 is enclosed in the separate housing and is separated from the weighing sensor 20, which will neither have influence on the weighing sensor 20 nor have pressure on the weighing sensor 20.

[0026] Preferably, in this embodiment, the separate housing comprises an upper separate housing 50 and a lower separate housing 60, the upper separate housing 50 is fixedly connected to the sensor upper support plate 10, the lower separate housing 60 is fixedly connected to the sensor lower support plate 30, and the upper separate housing 50 is connected to the lower separate housing 60 in a vertical butt joint to form a closed cavity structure.

[0027] Further, an upper end face of the upper separate housing 50 is provided with a mounting slot 51 , and the mounting slot 51 is located directly above the weighing sensor 20.

The upper portion of one end of the weighing sensor 20 is provided with a first sensor gasket 21 , and the first sensor gasket 21 is connected to the sensor upper support plate 10. The lower separate housing 60 is enclosed on an outer side face of the sensor lower support plate 30, the lower portion of the other end of the weighing sensor 20 is provided with a second sensor gasket 22, and the second sensor gasket 22 is connected to the sensor lower support plate 30.

[0028] In particular, in this embodiment, the upper separate housing 50 is preferably enclosed by an upper end face 52, a first group of front and rear surfaces (including a first front surface 53 and a first rear surface 54) and a first side face 55 to form an open housing structure, the lower separate housing 60 is enclosed by a top surface 61 , a second group of front and rear surfaces (including a second front surface 62 and a second rear surface 63) and a second side face 64 to form an open housing structure, and the upper separate housing 50 is connected to the lower separate housing 60 in a vertical cover-fit manner.

[0029] Herein, the second group of front and rear surfaces (including the second front surface 62 and the second rear surface 63) of the lower separate housing 60 are preferably trapezoidal surfaces, and the top surface 61 is connected between the second group of front and rear surfaces (including the second front surface 62 and the second rear surface 63). The junctions of the second group of front and rear surfaces (including the second front surface 62 and the second rear surface 63) and the top surface 61 are provided with a corresponding clamping slot 65.

[0030] In order to make the connection between the upper housing and the lower housing more firm and stable, the width of the upper separate housing 50 is preferably greater than or equal to that of the lower separate housing 60, the upper separate housing 50 covers outside the lower separate housing 60, and the upper end face 52 of the upper separate housing 50 is clamped in the corresponding clamping slot 65. [0031] In addition, the upper portion of the upper separate housing 50 is provided with a first cable clamping device 56, the lower portion of the lower separate housing 60 is provided with a second cable clamping device 66, and the electric motor cable 40 penetrates into the first cable clamping device 56 and penetrates out of the second cable clamping device 66. An initial segment electric motor cable 42 of the electric motor cable 40 is located outside the first cable clamping device 56, and a final segment electric motor cable 43 of the electric motor cable 40 is located outside the second cable clamping device 66. The lower separate housing 60 is further provided with a third cable clamping device 67, and a sensor cable 23 of the weighing sensor 20 penetrates out of the third cable clamping device 67.

[0032] According to the foregoing structural description, the weighing sensor assembly according to the present invention uses the form of a separate housing, for example, the upper separate housing 50 is fixed below the sensor upper support plate 10. The electric motor 70, the initial segment electric motor cable 42 and the upper separate housing 50 are disposed above the weighing sensor 20, so as to ensure that the internal stress of the initial segment electric motor cable 42 from the electric motor 70 to the upper separate housing 50 has no interference to the weighing sensor 20.

[0033] Similarly, the lower separate housing 60 is fixed to the sensor lower support plate 30 without being in contact with the weighing sensor 20, the cable passing therein is separated, the internal separate cable is kept loosen, and both ends of the separate cable 41 are fixed by the first cable clamping device 56 and the second cable clamping device 66, which ensures that the final segment electric motor cable 43 will not interfere with the separate cable 41 in the housing and thus will not interfere with the initial segment electric motor cable 42, thereby finally ensuring the weighing precision and stability of the weighing sensor.

[0034] FIG. 8 is a front view of the weighing sensor assembly according to the present invention after being assembled.

[0035] As shown in FIG. 8, since the weighing results of the weighing sensor may be influenced by any external substance or airflow interference that may cause deformation or pressure on the weighing sensor, for the weighing sensor assembly according to the present invention, with the embedded structure design of the separate housing, the lower separate housing 60 is fixed to the sensor lower support plate 30, such that the lower separate housing 60 is neither in contact with the upper separate housing 50 nor in stress contact with the weighing sensor 20, and thus such an external weighing sensor can be protected from the interference of external dust, particles or wind. [0036] The configuration of the separate housing allows the external dust and particulate matters to be kept out of the housing while protecting the sensor, which improves the long-term weighing stability of the weighing sensor, the reliability of sensor calibration, and the convenience of daily cleaning and maintenance.

[0037] FIG. 9 is a structural schematic diagram of a dynamic automatic checkweigher according to the present invention. FIG. 10 is a schematic diagram of installation of a weighing sensor in the dynamic automatic checkweigher according to the present invention.

[0038] As shown in FIGS. 9 and 10, The present invention further provides a dynamic automatic checkweigher, characterized by comprising the foregoing weighing sensor assembly.

[0039] Specifically, the dynamic automatic checkweigher according to the present invention mainly comprises the following components: an input tabletop assembly 100, a weighing tabletop assembly 200, an output tabletop assembly 300, a weighing sensor assembly 900, an input tabletop support beam 110, an output tabletop support beam 310, a machine frame assembly 400, supporting base legs 500, an electric cabinet 600, an optoelectronic component 700, and a conveying tabletop supporting assembly 800. Herein, the weighing sensor assembly 900 is the foregoing weighing sensor assembly according to the present invention.

[0040] The tabletop assemblies (the input tabletop assembly 100 and the output tabletop assembly 300) further comprise a roller, an electric motor, a belt, a moving component such as a synchronous belt, and other fixed components, and are mainly configured to ensure the smooth conveying and transition of products. A tabletop supporting member mainly supports the tabletop assemblies and ensures the structural stability of the tabletop assemblies.

[0041] The weighing sensor assembly is the foregoing weighing sensor assembly, is fixed to the machine frame assembly 400, is configured for fixing and mounting the weighing tabletop assembly 200 over the sensor assembly, and is mainly configured to detect the weight of products in a dynamic conveying state. The input tabletop support beam 110 and the output tabletop support beam 310 are fixed to two ends of a machine frame, and are used to support the input and output of a tabletop and support an adjusting assembly.

[0042] The machine frame assembly 400 is used to support the tabletop assemblies, sensor components and other assemblies to ensure the structural stability of the machine. The supporting base legs 500 are used for fixing the machine frame and adjusting the height of the machine. The electric cabinet 600 is configured to control the machine and transmit signals. The optoelectronic component 700 is used to confirm this product and detect the length of the product. The conveying tabletop supporting assembly 800 is mainly used to fixedly support the input and output of tabletops on both sides and adjust positions of the tabletops in the conveying direction and in the height direction.

[0043] In the weighing sensor according to the present invention, the initial segment electric motor cable 42 is connected to the electric motor 70, the final segment electric motor cable 43 is connected to the electric cabinet 600, and the sensor cable 23 is connected to the electric cabinet 600 to transmit sensor signals to the electric cabinet 600. The weighing sensor is fixed to the machine frame assembly 400, and the weighing tabletop assembly 200 is fixed and mounted on the weighing sensor, so as to form a weighing portion of the dynamic automatic checkweigher.

[0044] According to the above description, the weighing sensor assembly and the dynamic automatic checkweigher comprising same have the following advantages:

I. using a separate electric motor bridge structure to improve the weighing precision and stability;

II. reducing the interference of an electric motor cable to the static performance of the sensor (zero drift);

III. improving the protective performance of sensor components to reduce the interference of dust and particles to the sensor; and

IV. using an external housing structure design, which is easy to clean and maintain and also improves the appearance of the sensor and the electric motor cable.

[0045] In conclusion, for the weighing sensor assembly and the dynamic automatic checkweigher comprising same according to the present invention, a new sensor housing structure is used, and with the embedded housing structure design, the interference of environmental factors such as external dust and airflow on the sensor is reduced, and the level of protection of the sensor is improved. Moreover, the components of sensor are also easier to maintain.

[0046] With the separate housing connection mode, the interferences to a final segment cable caused by the internal stress of an electric motor cable itself and the external stress are isolated, which reduces the interference to the weighing detection caused by the internal stress of the electric motor cable and an external cable, thus greatly improving the static weighing performance and the stability of dynamic weighing precision of the sensor.

[0047] Although specific implementations of the present invention have been described above, those skilled in the art should understand that these are merely examples, and the scope of protection of the present invention is defined by the appended claims. Various alterations or modifications to these implementations can be made by a person skilled in the art without departing from the principle and essence of the present invention. However, these alterations and modifications all fall within the scope of protection of the present invention.

Reference signs list [0048]

10 Sensor upper support plate

20 Weighing sensor

30 Sensor lower support plate

40 Electric motor cable

41 Separate electric cable

50 Upper separate housing 60 Lower separate housing

51 Mounting slot 21 First sensor gasket 22 Second sensor gasket

52 Upper end face

53 First front surface

54 First rear surface

55 First side face 61 Top surface 62 Second front surface

63 Second rear surface

64 Second side face

65 Clamping slot

56 First cable clamping device

66 Second cable clamping device

42 Initial segment electric motor cable

43 Final segment electric motor cable 67 Third cable clamping device 23 Sensor cable 70 Electric motor 100 Input tabletop assembly 200 Weighing tabletop assembly

300 Output tabletop assembly Input tabletop support beam

Output tabletop support beam

Machine frame assembly

Supporting base leg

Electric cabinet

Optoelectronic assembly

Conveying tabletop supporting assembly

Weighing sensor assembly