Force measuring device for tread brake and tread brake

Abstract

The utility model relates to the technical field of railway vehicles, and particularly discloses a force measuring device for a tread brake and the tread brake. The force measuring device comprises a main body with a containing cavity, a force measuring element contained in the containing cavity, a first connecting structure connected to the main body and a connecting rod which is connected to the main body and is movably arranged in the axis direction of the main body relative to the force measuring element, and the first connecting structure is used for being connected with a driving rod. Part of the connecting rod is located in the containing cavity and used for making contact with the force measuring element, the connecting rod further comprises a second connecting structure located outside the containing cavity and used for being connected with the brake head, and the first connecting structure and the second connecting structure are located on the two sides of the body in the axis direction respectively. The force measuring device provided by the utility model is compact in structure, and when the driving rod and the brake head of the tread brake are connected, the thrust applied to the brake head by the driving rod can be accurately measured.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicles, in particular to a force measuring device for a tread brake and a tread brake. Background Art

[0002] Tread brakes are widely used in rail transit vehicles. Tread brakes drive the brake shoe to move toward the wheel to be braked, so that the brake shoe is pressed against the wheel tread to produce a braking effect. In order to ensure that the vehicle can stop safely, the thrust that the tread brake can output needs to meet certain requirements.

[0003] At present, the thrust of the tread brake is usually indirectly estimated based on the air pressure in the brake cylinder. Although the air pressure in the brake cylinder is approximately linearly related to the thrust that the tread brake can output, there is a certain hysteresis when the brake cylinder has air intake and return. Therefore, there may still be a large error between the thrust calculated based on the gas pressure in the brake cylinder and the actual thrust. Utility Model Content

[0004] The utility model aims to provide a force measuring device which can accurately measure the output thrust of a tread brake and a tread brake comprising the same.

[0005] To achieve the above-mentioned purpose, the utility model proposes a force measuring device for a tread brake, comprising a main body with a receiving cavity, a force measuring element received in the receiving cavity, a first connecting structure connected to the main body, and a connecting rod connected to the main body and movably arranged along the axial direction of the main body relative to the force measuring element, the first connecting structure is used to connect a driving rod, part of the connecting rod is located in the receiving cavity for contacting the force measuring element, the connecting rod also includes a second connecting structure located outside the receiving cavity for connecting to a brake shoe support, and the first connecting structure and the second connecting structure are respectively located on both sides of the axial direction of the main body.

[0006] As a further improvement of the present invention, the first connecting structure includes a tubular portion connected to the main body, a toothed portion formed at one end of the tubular portion away from the main body in the axial direction of the main body, and the tubular portion is surrounded by a mating cavity extending along the axial direction of the main body.

[0007] As a further improvement of the present invention, the first connection structure further includes a second clamping groove formed by being recessed from the outer periphery of the tubular portion.

[0008] As a further improvement of the present invention, the second connecting structure includes a connecting hole opened on the connecting rod, the axis of the connecting hole is perpendicular to the axis of the connecting rod, and a spherical portion is formed on one end of the connecting rod away from the main body in the axial direction of the main body, and the connecting hole is opened on the spherical portion.

[0009] As a further improvement of the present invention, the main body includes a shell and an end cover connected to one end of the shell, the shell and the end cover surround the accommodating cavity, the end cover is provided with a through hole for the connecting rod to pass through, and an anti-detachment structure is provided between the connecting rod and the end cover for preventing the connecting rod from detaching from the main body along the axial direction of the main body.

[0010] As a further improvement of the present invention, the anti-slip structure includes a third groove formed by a recessed outer periphery of the portion of the connecting rod located in the accommodating cavity, and a third clamping ring clamped in the third groove, wherein the diameter of the third clamping ring is larger than the diameter of the through hole.

[0011] As a further improvement of the present utility model, a first opening close to the connecting rod is formed on the end cover, a second opening corresponding to the first opening is formed on the connecting rod, and the force measuring device also includes a first clamping block arranged in the first opening and the second opening to prevent the connecting rod from rotating relative to the end cover; a third opening close to the shell is formed on the end cover, a fourth opening corresponding to the third opening is formed on the main body, and the force measuring device also includes a second clamping block arranged in the third opening and the fourth opening to prevent the end cover from rotating relative to the main body.

[0012] As a further improvement of the present invention, the fourth opening connects the accommodating cavity and the outside of the main body along the radial direction of the main body. In the axial direction of the main body, the size of the fourth opening is larger than the size of the second block. The force measuring element includes a force measuring body and a wire connected to the force measuring body, and at least part of the length of the wire extends from the fourth opening to the outside of the accommodating cavity.

[0013] As a further improvement of the present invention, a fixing structure for fixing the force measuring element to the main body is formed on the main body.

[0014] The utility model also provides a tread brake, comprising a brake shoe support and a driving structure for driving the brake shoe support to move, wherein the driving structure comprises a driving rod, a brake cylinder for driving the driving rod to move, and the above-mentioned force measuring device connecting the driving rod and the brake shoe support.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a force measuring device for a tread brake and the tread brake, wherein the force measuring device has a compact structure and can accurately measure the thrust applied by the driving rod to the brake shoe support when the driving rod and the brake shoe support of the tread brake are connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional cross-sectional structural schematic diagram of a force measuring device for a tread brake is provided for one embodiment of the utility model;

[0018] Figure 2 for Figure 1 An exploded schematic diagram of the force measuring device in FIG.

[0019] Figure 3 for Figure 2 A schematic structural diagram of the middle body and the first connecting structure;

[0020] Figure 4 for Figure 2 Structural schematic diagram of the middle end cover;

[0021] Figure 5 A sectional view of a partial structure of a tread brake provided in one embodiment of the utility model.

[0022] In the figure:

[0023] 10. Force measuring device;

[0024] 1. Main body; 11. Accommodating cavity; 12. Shell; 13. End cover; 131. Through hole; 132. First opening; 133. Third opening; 141. Third clamping groove; 142. Third clamping ring; 15. Fourth opening; 16. Fixing structure;

[0025] 2. force measuring element; 201. force measuring body; 202. wire;

[0026] 3. First connection structure; 31. Tubular portion; 32. First toothed portion; 33. Second slot; 34. Matching cavity;

[0027] 4. connecting rod; 41. second connecting structure; 411. spherical portion; 412. connecting hole; 42. second opening;

[0028] 5. The first card block;

[0029] 6. The second card block;

[0030] 20. Driving rod; 21. Blocking cover; 22. Adjusting nut; 221. First slot. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0032] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0033] like Figure 1-5 As shown, an embodiment of the utility model provides a tread brake, which includes a brake shoe support, a driving structure for driving the brake shoe support to move, and the driving structure includes a driving rod 20 and a brake cylinder for driving the driving rod 20 to move. The tread brake also includes a force measuring device 10 connecting the driving rod 20 and the brake shoe support.

[0034] The brake shoe support is connected to a brake shoe for contacting the wheel tread. When the tread brake is working, the driving rod 20 pushes the brake shoe support forward under the action of the brake cylinder, so that the brake shoe on the brake shoe support is in close contact with the wheel tread to brake the wheel. The driving rod 20 is preferably a screw rod. When the driving rod 20 moves forward under the action of the brake cylinder, it also rotates around its own axis. Since the force measuring device 10 is connected between the driving rod 20 and the brake shoe support, the force measuring device 10 can directly measure the thrust applied by the driving rod 20 to the brake shoe support.

[0035] Hereinafter, the force measuring device 10 will be mainly described, and other structures of the tread brake can refer to the prior art and will not be described in detail here.

[0036] The force measuring device 10 includes a main body 1 having a receiving cavity 11, a force measuring element 2 received in the receiving cavity 11, a first connecting structure 3 connected to the main body 1, and a connecting rod 4 connected to the main body 1 and movably arranged along the axial direction of the main body 1 relative to the force measuring element 2. The first connecting structure 3 is used to connect the driving rod 20, and part of the connecting rod 4 is located in the receiving cavity 11 for contacting the force measuring element 2. The connecting rod 4 also includes a second connecting structure 41 located outside the receiving cavity 11 for connecting to the brake shoe support. The first connecting structure 3 and the second connecting structure 41 are respectively located on both sides of the axial direction of the main body 1.

[0037] Along the axial direction of the main body 1, the connecting rod 4 can move within a certain range relative to the force measuring element 2. When the driving rod 20 pushes the brake shoe holder forward so that the brake shoe on the brake shoe holder contacts the wheel tread, one end of the force measuring element 2 contacts the connecting rod 4 and the other end contacts the main body 1. At this time, the force measuring element 2 can measure the thrust of the driving rod 20 pushing the brake shoe holder. When the driving rod 20 moves backward so that the brake shoe holder retracts, the force measuring element 2 and the connecting rod 4 can be out of contact.

[0038] The first connection structure 3 includes a tubular portion 31 connected to the main body 1 and a first toothed portion 32 formed at one end of the tubular portion 31 away from the main body 1 in the axial direction of the main body 1 . The tubular portion 31 is surrounded by a matching cavity 34 extending along the axial direction of the main body 1 .

[0039] When the first connecting structure 3 and the driving rod 20 are connected (such as Figure 5 As shown in the figure, the end of the driving rod 20 extends into the matching cavity 34, the outer periphery of the driving rod 20 is connected with a stopper 21, the outer periphery of the first connecting structure 3 is sleeved with an adjusting nut 22, the stopper 21 is located in the adjusting nut 22, the adjusting nut 22 includes a first clamping groove 221 formed by a concave arrangement on its inner peripheral surface, and a first clamping ring (not shown in the figure) can be clamped in the first clamping groove 221. In the axial direction of the driving rod 20, one end of the stopper 21 abuts against the adjusting nut 22, and the other end abuts against the first clamping ring, so that the stopper 21 and the adjusting nut 22 are connected together. The stopper 21 abuts against the first connecting structure 3, and a second tooth-shaped portion that matches the first tooth-shaped portion 32 is formed on the stopper 21.

[0040] When the driving rod 20 moves forward (i.e., the driving rod 20 is in Figure 5 In the state shown, it moves from bottom to top), it rotates synchronously with the baffle cover 21 and the adjusting nut 22, and the first connecting structure 3 does not rotate accordingly. The first tooth-shaped portion 32 and the second tooth-shaped portion can be made of wear-resistant material to effectively withstand the friction between the first connecting structure 3 and the baffle cover 21, and when the first tooth-shaped portion 32 and the second tooth-shaped portion are subjected to the friction between the first connecting structure 3 and the baffle cover 21, the position of the force measuring device 10 can float slightly in the axial direction of the driving rod 20 relative to the position of the baffle cover 21. Because the force measuring device 10 is connected to the brake shoe support, the position of the brake shoe on the brake shoe support can also float slightly in the axial direction of the driving rod 20 relative to the baffle cover 21. In this way, the brake shoe can better contact the wheel tread for braking.

[0041] An elastic member such as a disc spring (not shown in the figure) may be provided between the adjusting nut 22 and the first connecting structure 3. The elastic member is located on the side of the stop cover 21 close to the main body 1 and elastically expands and contracts along the axis direction of the driving rod 20. The two ends of the elastic member in the axis direction of the driving rod 20 respectively abut against the adjusting nut 22 and the stop cover 21, so that the adjusting nut 22 can more reliably drive the stop cover 21 to rotate synchronously. When the adjusting nut 22 is turned, the adjusting nut 22 drives the driving rod 20 to rotate through the stop cover 21, so that the driving rod 20 can move backward along its axis direction (that is, the driving rod 20 moves backward in the axis direction). Figure 5 In the state shown, the driving rod 20 is moved from top to bottom to adjust the position of the driving rod 20.

[0042] Furthermore, the first connection structure 3 also includes a second clamping groove 33 formed by a recessed outer periphery of the tubular portion 31 , in which a second clamping ring (not shown) can be clamped, and the second clamping ring can prevent the adjusting nut 22 from detaching from the first connection structure 3 .

[0043] The second connection structure 41 includes a connection hole 412 formed in the connection rod 4, the axis of the connection hole 412 is perpendicular to the axis of the connection rod 4, and a spherical portion 411 is formed at one end of the connection rod 4 away from the main body 1 along the axis direction of the main body 1, and the connection hole 412 is formed on the spherical portion 411. A pin can be inserted into the connection hole 412, and the brake shoe support and the connection rod 4 can be rotatably connected through the pin, and the brake shoe support also has a spherical groove matching the spherical portion 411. The spherical portion 411 cooperates with the spherical groove and will not affect the rotation of the brake shoe support relative to the connection rod 4 around the axis of the connection hole 412. It can be imagined that because the axis of the connection hole 412 is perpendicular to the axis of the connection rod 4, when the connection rod 4 is connected to the brake shoe support, it cannot rotate relative to the brake shoe support around the axis of the main body 1.

[0044] In this embodiment, the main body 1 includes a shell 12 and an end cover 13 connected to one end of the shell 12. The shell 12 and the end cover 13 surround a receiving cavity 11. The end cover 13 is provided with a through hole 131 for the connecting rod 4 to pass through. An anti-detachment structure is provided between the connecting rod 4 and the end cover 13. The anti-detachment structure can prevent the connecting rod 4 from detaching from the main body 1 along the axial direction of the main body 1.

[0045] Specifically, the anti-slip structure includes a third clamping groove 141 formed by a concave arrangement on the outer circumference of the portion of the connecting rod 4 located in the receiving cavity 11, and a third clamping ring 142 clamped in the third clamping groove 141. The diameter of the third clamping ring 142 is larger than the diameter of the through hole 131, so that the connecting rod 4 cannot be separated from the main body 1 along the axial direction of the main body 1. It can be imagined that the third clamping ring 142 and the end cover 13 can form a gap in the axial direction of the main body 1, so that the connecting rod 4 can move relative to the end cover 13 along the axial direction of the main body 1.

[0046] The end cover 13 is detachably connected to the housing 12 by fasteners such as screws. The diameter of the spherical portion 411 is larger than the diameter of the through hole 131. When assembling the force measuring device 10, the connecting rod 4 must first be passed through the end cover 13, and then the third retaining ring 142 must be clamped in the third retaining groove 141. After that, the end cover 13 is connected to the housing 12 by fasteners such as screws.

[0047] The end cover 13 is provided with a first opening 132 close to the connecting rod 4, and the connecting rod 4 is provided with a second opening 42 corresponding to the first opening 132. The force measuring device 10 further includes a first block 5 disposed in the first opening 132 and the second opening 42, and the first block 5 can prevent the connecting rod 4 from rotating relative to the end cover 13 around the axis of the main body 1. The end cover 13 is provided with a third opening 133 close to the housing 12, and the main body 1 is provided with a fourth opening 15 corresponding to the third opening 133. The force measuring device 10 further includes a second block 6 disposed in the third opening 133 and the fourth opening 15, and the second block 6 can prevent the end cover 13 from rotating relative to the housing 12 around the axis of the main body 1.

[0048] With the above arrangement, the connecting rod 4 cannot rotate relative to the main body 1 around the axis of the main body 1. On this basis, as described above, when the connecting rod 4 is connected to the brake shoe support, it cannot rotate relative to the brake shoe support around the axis of the main body 1. Therefore, when the connecting rod 4 is connected to the brake shoe support, the entire force measuring device 10 cannot rotate relative to the brake shoe support around the axis of the main body 1. When the driving rod 20 drives the blocking cover 21 to rotate, the force measuring device 10 does not rotate accordingly.

[0049] It is conceivable that in order to prevent the connecting rod 4 from rotating relative to the main body 1 around the axis of the main body 1, other solutions can be adopted, for example, a limiting rod is provided that passes through the main body 1 and the connecting rod 4 along the radial direction of the main body 1.

[0050] The force measuring element 2 includes a force measuring body 201 and a wire 202 connected to the force measuring body 201. The wire 202 is used to electrically connect to a power source or a processing unit. The power source can supply power to the force measuring element 2 through the wire 202. The data measured by the force measuring element 2 can be transmitted to the processing unit through the wire 202.

[0051] Furthermore, the fourth opening 15 connects the accommodating cavity 11 and the outside of the main body 1 along the radial direction of the main body 1, and in the axial direction of the main body 1, the size of the fourth opening 15 is larger than the size of the second card block 6. In this way, the fourth opening 15 can not only be used to cooperate with the second card block 6, but also at least a partial length of the wire 202 can also extend from the fourth opening 15 to the outside of the accommodating cavity 11 to be electrically connected to the power supply or the processing unit.

[0052] A fixing structure 16 for fixing the force measuring element 2 to the main body 1 is also formed on the main body 1. When the fixing structure 16 fixes the force measuring element 2 to the main body 1, the force measuring element 2 will not shake in the receiving cavity 11 and its position will be more stable.

[0053] In this embodiment, the outer diameter of the force measuring element 2 is slightly smaller than the diameter of the accommodating cavity 11. The fixing structure 16 includes a threaded hole opened in the main body 1 and extending along the radial direction of the main body 1, and a threaded member threadedly connected to the threaded hole and one end of which abuts against the force measuring element 2. The threaded member can clamp the force measuring element 2 together with the side wall of the accommodating cavity 11, so that the force measuring element 2 remains fixed relative to the main body 1.

[0054] It is conceivable that the fixing structure 16 may also adopt other settings. For example, in other embodiments, the fixing structure 16 may also be a pressure block arranged in the accommodating cavity 11, which is connected to the main body 1 and presses against the side of the force measuring element 2 toward the connecting rod 4.

[0055] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0056] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A force measuring device for a tread brake, characterized in that: It includes a main body with a receiving cavity, a force measuring element received in the receiving cavity, a first connecting structure connected to the main body, and a connecting rod connected to the main body and movably arranged along the axial direction of the main body relative to the force measuring element. The first connecting structure is used to connect a driving rod, and part of the connecting rod is located in the receiving cavity for contacting the force measuring element. The connecting rod also includes a second connecting structure located outside the receiving cavity for connecting to a brake shoe support. The first connecting structure and the second connecting structure are respectively located on both sides of the axial direction of the main body.

2. The force measuring device according to claim 1, characterized in that The first connection structure includes a tubular portion connected to the main body, and a toothed portion formed at one end of the tubular portion away from the main body in the axial direction of the main body. The tubular portion surrounds a matching cavity extending along the axial direction of the main body.

3. The force measuring device according to claim 2, characterized in that The first connection structure further includes a second slot formed by being recessed from the outer periphery of the tubular portion.

4. The force measuring device according to any one of claims 1 to 3, characterized in that: The second connection structure includes a connection hole opened in the connection rod, the axis of the connection hole is perpendicular to the axis of the connection rod, and a spherical portion is formed at one end of the connection rod away from the main body in the axial direction of the main body, and the connection hole is opened on the spherical portion.

5. The force measuring device according to claim 4, characterized in that The main body includes a shell and an end cover connected to one end of the shell. The shell and the end cover are arranged to form the accommodating cavity. The end cover is provided with a through hole for the connecting rod to pass through. An anti-detachment structure is arranged between the connecting rod and the end cover to prevent the connecting rod from detaching from the main body along the axial direction of the main body.

6. The force measuring device according to claim 5, characterized in that The anti-drop structure includes a third clamping groove formed by a recessed outer circumference of a portion of the connecting rod located in the accommodating cavity, and a third clamping ring clamped in the third clamping groove, wherein the diameter of the third clamping ring is greater than the diameter of the through hole.

7. The force measuring device according to claim 5, characterized in that The end cover is provided with a first opening close to the connecting rod, the connecting rod is provided with a second opening corresponding to the first opening, and the force measuring device also includes a first blocking block arranged in the first opening and the second opening to prevent the connecting rod from rotating relative to the end cover; the end cover is provided with a third opening close to the shell, the main body is provided with a fourth opening corresponding to the third opening, and the force measuring device also includes a second blocking block arranged in the third opening and the fourth opening to prevent the end cover from rotating relative to the main body.

8. The force measuring device according to claim 7, characterized in that The fourth opening connects the receiving cavity and the outside of the main body along the radial direction of the main body. In the axial direction of the main body, the size of the fourth opening is larger than the size of the second block. The force measuring element includes a force measuring body and a wire connected to the force measuring body. At least part of the length of the wire extends from the fourth opening to the outside of the receiving cavity.

9. The force measuring device according to claim 1, characterized in that: A fixing structure for fixing the force measuring element to the main body is formed on the main body.

10. A tread brake, characterized in that: It comprises a brake shoe support and a driving structure for driving the brake shoe support to move, wherein the driving structure comprises a driving rod, a brake cylinder for driving the driving rod to move, and a force measuring device according to any one of claims 1 to 9 connecting the driving rod and the brake shoe support.

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