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Title:
SAFETY DEVICE FOR A LINER PROCESSING MACHINE
Document Type and Number:
WIPO Patent Application WO/2017/198355
Kind Code:
A1
Abstract:
The invention relates to a device (3) for controlling a feeding of a wire element (4) handling an apparatus. The device (3) comprises a horizontally extending switch element (5) that is movable between a first position and a second position, a wire element (4) movable in a vertical direction by means of a motor (7) and connected the switch element (5), and a spring element (8) arranged to bias the switch element (5) in a first vertical direction. The motor (7) is operable when the switch element (5) is in its first position and non-operable when the switch element (5) is in its second position. The invention also relates to a method for controlling a feeding of a wire element (4) handling an apparatus.

Inventors:
GUSTAFSSON, Anders (Gullbergagatan 28, Malmö, 212 30, SE)
PERSSON, Patrick (Christergatan 3, Ekeby, 267 76, SE)
PRANTER, Mats (Grönalundsgatan 13 A, Limhamn, 216 16, SE)
Application Number:
EP2017/055560
Publication Date:
November 23, 2017
Filing Date:
March 09, 2017
Export Citation:
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Assignee:
CHRIS-MARINE AB (P.O Box 9025, Malmö, 200 39, SE)
International Classes:
B24B33/02; B23P6/02
Foreign References:
US4109418A1978-08-29
US3434242A1969-03-25
Attorney, Agent or Firm:
AWAPATENT AB (P.O. Box 5117, Malmö, 200 71, SE)
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Claims:
CLAIMS

1 . A device (3) for controlling a feeding of a wire element (4) handling an apparatus, comprising

a switch element (5) being rotatable about a shaft (6) and movable between a first position and a second position,

a wire element (4) movable by means of a motor (7) and connected to said switch element (5), said motor (7) being operable when said switch element (5) is in its first position and non-operable when said switch element (5) is in its second position, and

a spring element (8) arranged to bias said switch element (5), wherein said switch element (5) is in its first position when a lifting force applied to said switch element (5), via said wire element (4), is greater than the biasing force of said spring element (8) onto said switch element (5), and in its second position when said biasing force is greater than said lifting force.

2. The device (3) according to claim 1 , wherein said switch element (5) is horizontally extending and comprises a first surface (1 1 ) and a second surface (12), and a first section (13) and a second section (14).

3. The device (3) according to claim 2, wherein said wire element (4) is connected to said first surface (1 1 ) at said first section (13) of said switch element (5), and said spring element (8) is arranged to bias said second surface (12) at said second section (14) of said switch element (5), said second section (14) being located on the opposite side of said shaft (6) in relation to said first section (13).

4. The device (3) according to claim 2, wherein said wire element (4) is connected to said first surface (1 1 ) at said second section (14) of said switch element (5), said spring element (8) is arranged to bias said first surface (1 1 ) at said second section (14) of said switch element (5), and said shaft (6) is arranged in said first section (13) of said switch element (5).

5. The device (3) according to claim 1 , wherein said switch element (5) has an L-shape, said wire element (4) is connected to said first surface (1 1 ) at said first section (13) of said switch element (5), and said spring element (8) is arranged to bias said second surface (12) at said second section (14) of said switch element (5), said second section (14) being located on the opposite side of said shaft (6) in relation to said first section (13).

6. The device (3) according to any one of the preceding claims, further comprising an indicator (15) adapted to indicate when said switch element (5) is in its second position, and a control unit (16) adapted to place said motor (7) in a non-operable state based on an indication from said indicator (15).

7. The device (3) according to any one of the preceding claims, further comprising an attachment element (9) attaching said wire element (4) to said switch element (5).

8. The device (3) according to any one of the preceding claims, wherein said wire element (4) is chosen from the group consisting of a chain, a steel wire, a stiff cord or a string.

9. The device (3) according to any one of the preceding claims, further comprising a ratchet (10) movable between an idle position and a locking position, wherein said switch element (5) is fixed in its first position when said ratchet (10) is placed in its locking position.

10. An apparatus, comprising the device (3) according to any one of claims 1 -9, wherein said switch element (5) is fixed to a portion of said apparatus by means of said shaft (6). 1 1 .A liner processing machine (1 ) for maintenance of a cylinder liner

(2), comprising the device (3) according to any one of claims 1 -9.

12. The liner processing machine (1 ) according to claim 1 1 , wherein said switch element (5) is fixed to a portion of said liner processing machine (1 ) by means of said shaft (6). 13. The liner processing machine (1 ) according to claim 1 1 or 12, further comprising an indicator (15) adapted to indicate when said switch element (5) is in its second position, and a control unit (16) adapted to place said motor (7) in a non-operable state based on an indication from said indicator (15).

14. A method for controlling a feeding of a wire element (4) handling an apparatus, comprising the steps of

arranging a switch element (5) in a first position, in which a motor (7) connected to said wire element (4) is in an operable state, said switch element (5) being rotatable about a shaft (6) and connected to said wire element (4), and biased by means of a spring element (8), and

moving said switch element (5) to a second position, in which a motor (7) connected to said wire element (4) is in a non-operable state, when a lifting force applied to said switch element (5), via said wire element (4), is smaller than a biasing force of said spring element (8) onto said switch element (5).

15. The method according to claim 14, further comprising the step of sending an alarm by means of a control unit (16) based on an indication from an indicator (15) which is in communication with said switch element (5) when in its second position.

Description:
SAFETY DEVICE FOR A LINER PROCESSING MACHINE

Technical background

The invention relates to a device and a method for controlling a feeding of a wire element handling an apparatus. The invention also relates to a liner processing machine for maintenance of a cylinder liner.

Background art

In order to optimise the operational conditions of internal combustion engines and to prevent shutdowns to the largest extent possible, the operational state of the engines is checked at regular intervals. One common cause for impaired engine state or for shutdowns is that the piston rings have become worn-out or burnt and consequently need to be replaced. Experience has shown, however, that the cause may equally well be the cylinder liners which, when examined, have been found to be in a worn state or to no longer exhibit a desired surface because of depositions of soot or of abrasive or corrosive attacks on the cylinder liner walls. Attacks of this kind might be due to sulphurous fuel used to operate the engine, which in combination with steam produces sulphuric acid that condenses at predetermined temperature and pressure levels in the engine. The effects on the cylinder liner from for example corrosion attacks are localised because of the uneven distribution of cylinder oil, of gas leakage via openings, such as passages between piston rings and cylinder liner, and/or variations of the cylinder liner wall

temperature.

Cylinder liner checks are therefore extremely important to determine whether the heat stress or other damage, to which the cylinder liner has been exposed has caused the liner to deform, resulting in the liner adopting an oval shape or a trumpet shape with a larger diameter in the top section. If any defects or deviations in the cylinder liner is detected it is vital to alleviate the same as soon as possible.

When maintenance of the cylinder liner is necessary it is conventional to use a liner processing machine that is lowered into the cylinder liner by means of a wire such that the inner surface of the same can be processed. A problem that might arise during such a process is that the liner processing machine gets stuck in the cylinder liner due to the pressure applied towards the inner surface of the cylinder liner. If the feeding of the wire is continued while the liner processing machine is stuck, there is a risk of an undesired movement of the same when it comes loose from the inner surface of the cylinder liner. Such a movement could potentially injure the operator of the machine and/or damage the cylinder liner.

Summary of the invention

It is an object of the present invention to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solve at least the above mentioned problem.

According to a first aspect, these and other objects are achieved in full, or at least in part, by a device for controlling a feeding of a wire element handling an apparatus. The device comprises a switch element which is rotatable about a shaft and movable between a first position and a second position, a wire element movable by means of a motor and connected to the switch element, the motor being operable when the switch element is in its first position and non-operable when the switch element is in its second position, and a spring element arranged to bias the switch element. The switch element is in its first position when a lifting force applied to the switch element, via the wire element, is greater than the biasing force of the spring element onto the switch element, and in its second position when the biasing force is greater than the lifting force.

As long as the apparatus follows the wire element without getting stuck in the environment, the lifting force applied to the switch element will be greater that the biasing force from the spring element on the switch element. Thus, the switch element will remain in its first position and the motor will accordingly be operable. However, if the apparatus gets stuck in the environment, the lifting force from the wire element will decrease as the motor continues to feed the same. When the biasing force exceeds the lifting force, the switch element will move into its second position and thus the motor will be placed in the non-operable state. Based on the above, the feeding of the wire element will be stopped as soon as the apparatus connected thereto gets stuck in its environment.

Accordingly, if the apparatus is related to a liner processing machine, the risk of undesired movement of the same when it comes loose after being stuck to the inner surface of the cylinder liner will be eliminated.

It should be noted that the device may be attached to the apparatus in any suitable way. In one preferred embodiment, the shaft, about which the switch element is rotatable, connects the device with the apparatus. Here, the wire element is directly attached to the switch element and the spring element biasing the switch element may completely or at least partly arranged in the apparatus (as well as in the device).

The switch element may be horizontally extending and comprise a first surface and a second surface, and a first section and a second section.

In one preferred embodiment, the wire element is connected to said first surface at the first section of the switch element, and the spring element arranged to bias the second surface at the second section of the switch element, the second section being located on the opposite side of the shaft in relation to the first section.

In another preferred embodiment, the wire element is connected to the first surface at the second of the switch element, the spring element is arranged to bias the first surface at the second section of the switch element, and the shaft is arranged in the first section of the switch element.

In yet another preferred embodiment, the switch element has an L- shape. Here, the wire element may be connected to the first surface at the first section of the switch element, and the spring element arranged to bias the second surface at the second section of the switch element, the second section being located on the opposite side of the shaft in relation to the first section.

The device may further comprise an indicator arranged above the first surface at the second section of the switch element and adapted to indicate when the switch element is in its second position, and a control unit adapted to place the motor in a non-operable state based on an indication from the indicator. Preferable, the indicator is a push button. Naturally, embodiments are available in which the control unit is left out of the equation. The switch element may for example turn off the motor directly when placed in its second position. Alternately, the switch element is in turn connected to another switch device for the same purpose.

The control unit may further be programmed to perform different types of tasks based on the information received from the indicator, such as for example triggering an alarm.

In one preferred embodiment of the invention, the first surface is a top surface of the switch element and the second surface is a bottom surface of the switch element.

The device may further comprise an attachment element attaching the wire element to the switch element, and the switch element may comprise a pin or a plate.

The wire element may be chosen from the group consisting of a chain, a steel wire, a stiff cord or a string.

The device may further comprise a ratchet movable between an idle position and a locking position, wherein the switch element is fixed in its first position when the ratchet is placed in its locking position. Such a ratchet may for example be advantageous when the wire element is about to be

connected to the attachment element or when the apparatus is stuck in relation to its environment and the operator wants to create a tension in the wire element before loosening the radial pressure from the apparatus.

According to a second aspect, the objects are achieved in full, or at least in part, by an apparatus comprising the device according to the features described above. The switch element may be fixed to a portion of the apparatus by means of the shaft.

According to a third aspect, the objects are achieved in full, or at least in part, by a liner processing machine comprising the device according to the features described above. The switch element may be fixed to a portion of the liner processing machine by means of the shaft.

The liner processing machine may further comprise an indicator arranged above the first surface at the second section of the switch element which is adapted to indicate when the switch element is in its second position, and a control unit adapted to place the motor in a non-operable state based on an indication from the indicator.

According to a fourth aspect, the objects are achieved in full, or at least in part, by a method for controlling a feeding of a wire element handling an apparatus. The method comprises the steps of arranging a switch element in a first position, in which a motor connected to the wire element is in an operable state, the switch element being rotatable about a shaft and connected to the wire element at a first section, and biased by means of a spring element at a second section, the second section being located on an opposite side of the shaft compared to the first section, and moving the switch element to a second position, in which a motor connected to the wire element is in an non-operable state, when a lifting force applied to the first section in a first vertical direction, via the wire element, is smaller than a biasing force of the spring element onto the second section of the switch element in the first vertical direction.

The method may further comprise the step of sending an alarm by means of a control unit based on an indication from an indicator which is in communication with the switch element when in its second position.

The method may further comprise the step of placing a ratchet, movable between an idle position and a locking position, in its locking position, in which the switch element is fixed in its first position.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [element, device, component, means, step, etc.]" are to be interpreted openly as referring to at least one instance of the element, device, component, means, step, etc., unless explicitly stated otherwise.

Brief description of the drawings

The above objects, as well as additional objects, features and advantages of the present invention, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, when taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is a perspective view of a liner processing machine according to one exemplary embodiment of one aspect of the invention.

Fig. 2 is an enlargement of a device according to one exemplary embodiment of one aspect of the invention.

Fig. 3a is a side view of the device in Fig. 2 when in its first position.

Fig. 3b is a side view of the device in Fig. 2 when in its second position.

Fig. 4a is a side view of the device according to another exemplary embodiment of one aspect of the invention.

Fig. 4b is a side view of the device according to yet another exemplary embodiment of one aspect of the invention. Detailed description of preferred embodiments of the invention

Fig. 1 illustrates a liner processing machine 1 according to one exemplary embodiment of one aspect of the invention. The liner processing machine 1 is especially adapted for maintenance of a cylinder liner 2. The liner processing machine 1 comprises a device 3 (see Fig. 2) for controlling a feeding of a wire element 4 which is used to move the liner processing machine 1 up and down in relation to the cylinder liner 2 during maintenance of the same. The device 3 comprises a switch element 5 which is rotatable about a shaft 6 and movable between a first position and a second position. The device 3 further comprises the wire element 4 which is movable by means of a motor 7 and which is connected to the switch element 5. The motor 7 is operable when the switch element 5 is in its first position and non- operable when the switch element 5 is in its second position. Further the device has a spring element 8 which is arranged to bias the switch element 5. Thus, it is the motor 7 that drives the wire element 4 up and down in the vertical direction. In turn, the state of the motor 7 is controlled by means of the device 3 in dependence of the position of the switch element 5.

As can be seen in Fig. 2, the switch element 5 is attached to a portion of the liner processing machine 1 by means of the shaft 6. It should be noted that this is only one preferred embodiment and that other attachment possibilities between the liner processing machine 1 and the device 3 naturally also are possible. In turn, the device 3 has an attachment element 9 attaching the wire element 4 to the switch element 5. In this embodiment, the device 3 also comprises a ratchet 10 which is movable between an idle position and a locking position. The ratchet 10 is fixing the switch element 5 to stay in its first position when the ratchet 10 is placed in its locking position.

Turning to Fig. 3a and 3b, the functioning of the device 3 will be explained below.

In Fig. 3a, the device 3 is illustrated when the switch element 5 is in its first position. Here, the lifting force applied to the switch element 5, via the wire element 4 connected thereto, is greater than the biasing force applied to the switch element 5, via the spring element 8. Thus, the motor 7 which is controlling the vertical movement of the liner processing device 1 performing the maintenance of the cylinder liner 2 is operable and fully functional.

In Fig. 3b, the device 3 is illustrated when the switch element 5 is in its second position. Here, the biasing force applies by the spring element 8 is greater than the lifting force applies by the wire element 4. Thus, the motor 7 is in a non-operable state.

In this specific embodiment, the switch element 5 is a horizontally extending plate and comprises a top surface 1 1 and a bottom surface 12, and a first section 13 and a second section 14. The wire element 4 is connected to the top surface 1 1 at the first section 13, and the spring element 8 is arranged to bias the bottom surface 12 at the second section 14. The first section 13 and the second section 14 are located on opposite sides of the shaft 6. The device 3 also comprises an indicator 15 adapted to indicate when the switch element 5 is in its second position, and a control unit 16 adapted to place the motor 7 in a non-operable state based on an indication from the indicator 15.

As long as the liner processing machine 1 follows the wire element 4 without getting stuck in the liner cylinder 2, the lifting force applied to the switch element 5 will be greater that the biasing force from the spring element 8 on the switch element 5. Thus, the switch element 5 will remain in its first position (Fig. 3a) and the motor 7 will accordingly be operable. However, if the liner processing machine 1 gets stuck in the cylinder liner 2, the lifting force from the wire element 4 will decrease as the motor continues to feed the same. When the biasing force exceeds the lifting force, the switch element 5 will move into its second position (Fig. 3b). Here, the switch element 5 will enter into contact with the indicator 15 connected to the control unit 16 which in turn will place the motor 7 in a non-operable state.

Fig. 4a and 4b illustrate further exemplary embodiments of the device 3 according to the present invention.

In Fig. 4a, the wire element 4 is connected to the top surface 1 1 at a mid section of the switch element 5 and the shaft 6 is arranged in the first section 13 of the switch element 5. The spring element 8 is arranged to bias the top surface 1 1 at the second section 14 of the switch element 5. The indicator 15 is arranged below the bottom surface 12 at the second section 14 of the switch element 5 and connected to the control unit 16. The overall functioning of the device 3 is the same as described above.

In Fig. 4b, the switch element 5 has an L-shape. The wire element 4 is connected to the top surface 1 1 at the first section 13 of the switch element 5 and the spring element 8 is arranged to bias the bottom surface 12 at the second section 14 of the switch element 5. The first section 13 is located on the opposite side of the shaft 6 in relation to the second section 14. The indicator 15 is arranged in connection with the top surface 1 1 at the second section 14 of the switch element 5 and connected to the control unit 16. The overall functioning of the device 3 is the same as described above.

It is understood that other variations in the present invention are contemplated and in some instances, some features of the invention may be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly in a manner consistent with the scope of the invention.

The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims. For instance, the first and second surface of the switch element may be different surfaces. In one example, the first surface is constituted by the top surface of the switch element and the second surface is constituted by the bottom surface of the switch element.

The first and second surface of the switch element may also be the same surface. In one example, both the first and the second surface are constituted by the bottom surface of the switch element.

The motor 7 may be a part of the device 3. However, it is also possible that the motor 7 is not an actual part of the device 3 itself.