A dynamic brake shoe pressure detection device

Abstract

The present invention discloses a dynamic brake shoe pressure detection device, which is fixedly clamped between the brake shoe and the brake shoe carrier. The device includes a metal top shell, a metal bottom shell, a pressure guiding body and a pressure sensor. The edge of the metal top shell is hermetically connected to the edge of the metal bottom shell, and a clamping cavity is formed between the metal top shell and the metal bottom shell. The exposed surface of the metal top shell is fixedly abutted against the inner surface of the brake shoe carrier, and the exposed surface of the metal bottom shell is fixedly abutted against the outer surface of the brake shoe. The pressure sensor and the pressure guiding body are clamped in the clamping cavity from top to bottom. Without affecting the normal use of the brake shoe and without changing the shape of the brake shoe carrier, this dynamic brake shoe pressure detection device can detect the dynamic brake shoe pressure, provide the braking force data for the rail vehicle in real time so that the driver can better control the rail vehicle, and give a real-time warning of the faults of the basic braking system to prevent the insufficient braking force or brake holding from endangering the operation safety of the rail vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicle braking systems, and particularly to a dynamic brake shoe pressure detection device. Background Art

[0002] With the development of railway transportation towards heavy haul and high speed, in order to ensure driving safety, it is inevitable to require rail vehicles to have stable and sufficient braking force. Due to the reasons of the design and structure of the basic braking system itself, failures often occur, and even accidents such as loss of braking force or brake seizure may occur. Timely grasping of the pressure received by each brake shoe during braking can, on the one hand, obtain the data of the braking force of the rail vehicle, and on the other hand, can timely detect the brake seizure fault to prevent more serious accidents from occurring.

[0003] Existing mature technologies can only detect the brake shoe pressure of rail vehicles in a stationary state, and the detection device needs to be removed after detection before the rail vehicle can be put into use. In addition, some relatively advanced technologies can detect dynamic brake shoe pressure, but the structure of the brake shoe needs to be modified, and the structure of the brake shoe on a dynamically running vehicle is not allowed to be modified. Using high-friction coefficient composite brake shoes with national standards, their size parameters are fixed, so the difficulty of modifying the brake shoe is extremely high; there are also some technologies that improve the structure of the existing brake shoe carrier to achieve the detection of dynamic brake shoe pressure. For example, a Chinese invention patent discloses a dynamic brake shoe pressure measuring device (application number: CN2017102645599), which improves the structure of the brake shoe carrier, and the impact of the improvement of the brake shoe carrier structure on driving safety cannot be evaluated temporarily. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a device that can detect the brake shoe pressure of rail vehicles under dynamic conditions without affecting the normal use of the brake shoes of rail vehicles and without changing the structure of the brake shoe carrier.

[0005] To achieve the above object, a dynamic brake shoe pressure detection device provided by the present invention is fixedly clamped between a brake shoe and a brake shoe carrier, and includes a metal top shell, a metal bottom shell, a pressure guiding body, and a pressure sensor;

[0006] The edge of the metal top shell is hermetically connected to the edge of the metal bottom shell, and a clamping cavity is formed between the metal top shell and the metal bottom shell. The exposed surface of the metal top shell is fixedly abutted against the inner surface of the brake shoe carrier, the exposed surface of the metal bottom shell is fixedly abutted against the outer surface of the brake shoe, and the pressure sensor and the pressure guiding body are clamped in the clamping cavity from top to bottom.

[0007] When the vehicle brakes, the brake shoe carrier transmits the braking pressure to the brake shoe through the dynamic brake shoe pressure detection device. The pressure guiding body transmits the braking pressure through the pressure sensor. By calculating the resistance change of the pressure detection sensor, the braking force can be obtained. In this way, the dynamic brake shoe pressure can be detected without affecting the normal use of the brake shoe and without changing the shape of the brake shoe carrier, providing real-time braking force data for the rail vehicle so that the driver can better operate the rail vehicle and giving an early warning of the basic braking system failure in real time, preventing insufficient braking force or braking locking from endangering the running safety of the rail vehicle.

[0008] In the above technical solution, the present invention can also be improved as follows.

[0009] Preferably, the pressure sensor is a multi-point thin film pressure sensor.

[0010] Preferably, the pressure guiding body includes a plurality of sheet-shaped gaskets that correspond one-to-one to the single-point pressure sensing areas of the pressure sensor.

[0011] Preferably, the outer contour of a single sheet-shaped gasket is located inside the corresponding single-point pressure sensing area.

[0012] Preferably, the surface of the metal bottom shell facing the brake shoe is provided with a heat insulation cushion layer that is directly opposite to the single-point pressure sensing area of the pressure sensor.

[0013] Preferably, the metal top shell has an arc-shaped curved surface structure adapted to the brake shoe carrier, the metal bottom shell has an arc-shaped curved surface structure adapted to the brake shoe, and the shape of the pressure sensor is adapted to the shape of the metal top shell.

[0014] Preferably, both sides of the metal bottom shell are fixedly provided with buckles for fixing the dynamic brake shoe pressure detection device on the inner side surface of the brake shoe carrier.

[0015] Preferably, a first through hole is opened in the middle of the metal top shell, a second through hole that is coaxial and has the same shape as the first through hole is opened in the middle of the metal bottom shell, a limiting strip protruding from the top surface of the metal bottom shell is arranged in the second through hole, the pressure sensor has an avoidance hole for avoiding the limiting strip, and the limiting strip is clamped in the first through hole and can move slightly along the axial direction of the first through hole.

[0016] Preferably, the sheet-shaped gasket is made of a non-metallic material with a low thermal conductivity.

[0017] Preferably, both the metal top shell and the metal bottom shell are made of a metal material with a low thermal conductivity and a high hardness.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. Brief Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art.

[0020] Figure 1 is a schematic perspective view of a dynamic brake shoe pressure detection device according to an embodiment of the present invention;

[0021] Figure 2 is Figure 1 exploded view of;

[0022] In the drawings:

[0023] Metal top shell 1, first through hole 11, metal bottom shell 2, second through hole 21, sheet gasket 3, pressure sensor 4, single-point pressure sensing area 41, heat insulation cushion layer 5, buckle 6, limiting strip 7. Specific embodiments

[0024] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] Please refer to Figure 1 and Figure 2 , this embodiment discloses a dynamic brake shoe pressure detection device, which includes a metal top shell 1, a metal bottom shell 2, a pressure guiding body, and a pressure sensor 4.

[0026] In this embodiment, no improvement is made to the structures of the brake shoe and the brake head carrier. The dynamic brake shoe pressure detection device is fixedly clamped between the brake shoe and the brake head carrier, so as not to affect the normal use of the brake shoe and the brake head carrier.

[0027] As Figure 1 shown, the edge of the metal top shell 1 is hermetically connected to the edge of the metal bottom shell 2, and a clamping cavity is formed between the metal top shell 1 and the metal bottom shell 2. The exposed surface of the metal top shell 1 is fixedly abutted against the inner surface of the brake head carrier, and the exposed surface of the metal bottom shell 2 is fixedly abutted against the outer surface of the brake shoe. The pressure sensor 4 and the pressure guiding body are clamped in the clamping cavity from top to bottom.

[0028] When the vehicle brakes, the brake head transmits the braking pressure to the brake shoe through the dynamic brake shoe pressure detection device. The pressure guiding body transmits the braking pressure through the pressure sensor 4. By calculating the resistance change of the pressure sensor 4, the braking force can be obtained. In this way, the dynamic brake shoe pressure can be detected without affecting the normal use of the brake shoe or changing the shape of the brake head, providing the braking force data for the rail vehicle in real time so that the driver can better control the rail vehicle, warning the basic braking system failure in real time, and preventing insufficient braking force or brake holding from endangering the running safety of the rail vehicle.

[0029] In this embodiment, the pressure sensor 4 is a multi-point thin film pressure sensor, and the pressure resistance strength of the multi-point thin film pressure sensor is not less than 5 MPa to meet the requirement of the braking pressure for the range.

[0030] As Figure 2 shown, the surface of the metal bottom shell 2 facing the brake shoe is provided with a heat insulation cushion layer 5 opposite to the single-point pressure induction area 41 of the pressure sensor 4.

[0031] In this embodiment, the metal top shell 1, the metal bottom shell 2 and the heat insulation cushion layer 5 are all made of metal materials with low thermal conductivity and high hardness, such as 630 stainless steel. In this way, the heat generated during the braking of the brake shoe can be reduced from being conducted to the multi-point thin film pressure sensor, effectively protecting the multi-point thin film pressure sensor. The heat insulation cushion layer 5 is welded to the metal bottom shell 2 to form a heat insulation cushion layer 5 with extremely high stability. The multi-point thin film pressure sensor is adhered to the inner side wall of the metal top shell 1 by double-sided adhesive, which is convenient for fixing. The thickness of the metal top shell 1 and the metal bottom shell 2 is between 0.5 mm and 0.8 mm, preferably 0.5 mm. In this way, while the metal top shell 1 and the metal bottom shell 2 do not deform under the frictional force in the shear direction, the total thickness of the dynamic brake shoe pressure detection device can be reduced as much as possible.

[0032] As Figure 2 shown, the pressure guiding body includes a plurality of sheet-shaped gaskets 3 corresponding one-to-one to the single-point pressure induction area 41 of the pressure sensor 4. The sheet-shaped gaskets 3 are made of non-metallic materials with low thermal conductivity. The outer contour of a single sheet-shaped gasket 3 is located inside the corresponding single-point pressure induction area 41, that is, the specification of a single sheet-shaped gasket 3 is smaller than that of the single-point pressure induction area 41, so that the braking pressure is transmitted through the single-point pressure induction area 41. The thickness of the pressure guiding body is between 0.3 mm and 0.5 mm, preferably 0.3 mm. The sheet-shaped gaskets 3 play a role of isolation, making the pressure sensor 4 not in contact with the metal bottom shell 2, and at the same time helping to reduce the total thickness of the dynamic brake shoe pressure detection device.

[0033] In this embodiment, the metal top shell 1 is an arc-shaped curved surface structure adapted to the shoe carrier, the metal bottom shell 2 is an arc-shaped curved surface structure adapted to the brake shoe, and the shape of the pressure sensor 4 is adapted to the shape of the metal top shell 1, so that the distribution of each single-point pressure sensing area 41 can adapt to the contact surface between the brake shoe and the shoe carrier, so that the braking pressure is completely transmitted through the single-point pressure sensing area.

[0034] In this embodiment, buckles 6 for fixing the dynamic brake shoe pressure detection device on the inner side surface of the shoe carrier are fixedly arranged on both sides of the metal bottom shell 2. The buckles 6 are preferably S-shaped wing plate buckles adapted to the shoe carrier mounting holes, so as to facilitate quickly fixing the dynamic brake shoe pressure detection device on the shoe carrier.

[0035] As Figure 2 shown, a first through hole 11 is opened in the middle of the metal top shell 1, a second through hole 21 coaxial with and having the same shape as the first through hole 11 is opened in the middle of the metal bottom shell 2, a limiting strip 7 protruding from the top surface of the metal bottom shell 2 is arranged in the second through hole 21, the pressure sensor 4 has an avoidance hole avoiding the limiting strip 7, the limiting strip 7 is clamped in the first through hole 11 and can move slightly along the axial direction of the first through hole 11. The limiting strip 7 is preferably a metal strip with a thickness of 2 mm - 3 mm and a material of 603 stainless steel. Since the limiting strip 7 is clamped in the first through hole 11 up and down, the metal top shell 1 and the metal bottom shell 2 cannot achieve relative radial movement, which can avoid damage to the multi-point thin film pressure sensor 4 caused by the relative radial movement of the metal top shell 1 and the metal bottom shell 2.

[0036] In summary, the dynamic brake shoe pressure detection device is adapted to be installed between the brake shoe and the shoe carrier in terms of its shape. It can detect the dynamic brake shoe pressure without affecting the normal and safe operation of the rail vehicle, can provide the braking force data for the rail vehicle driver in real time so that the driver can better operate the rail vehicle, and can give an early warning of the faults of the basic braking system in time to prevent insufficient braking force or brake holding from endangering the running safety of the rail vehicle. At the same time, the dynamic brake shoe pressure detection device can also detect the rail vehicle under static conditions, realizing both dynamic and static detection.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A dynamic brake shoe pressure detection device, fixedly clamped between the brake shoe and the brake shoe holder, characterized in that, It includes a metal top shell (1), a metal bottom shell (2), a pressure guiding body, and a pressure sensor (4); The edge of the metal top shell (1) is hermetically connected to the edge of the metal bottom shell (2), and a clamping cavity is formed between the metal top shell (1) and the metal bottom shell (2). The exposed surface of the metal top shell (1) is fixedly abutted against the inner surface of the tile holder, and the exposed surface of the metal bottom shell (2) is fixedly abutted against the outer surface of the brake shoe. The pressure sensor (4) and the pressure guiding body are clamped in the clamping cavity from top to bottom; The pressure sensor (4) is a multi-point thin film pressure sensor, and the pressure guiding body includes a plurality of sheet-shaped gaskets (3) corresponding one-to-one to the single-point pressure sensing areas (41) of the pressure sensor (4); On both sides of the metal bottom shell (2), there are fixed buckles (6) for fixing the dynamic brake shoe pressure detection device on the inner side surface of the tile holder; A first through hole (11) is provided in the middle of the metal top shell (1), and a second through hole (21) coaxial and identical in shape to the first through hole (11) is provided in the middle of the metal bottom shell (2). A limiting strip (7) protruding from the top surface of the metal bottom shell (2) is provided in the second through hole (21). The pressure sensor (4) has an avoidance hole avoiding the limiting strip (7), and the limiting strip (7) is clamped in the first through hole (11) and can move slightly along the axial direction of the first through hole (11).

2. The dynamic brake shoe pressure detection device according to claim 1, wherein The outer contour of a single sheet-shaped gasket (3) is located inside the edge of the corresponding single-point pressure sensing area (41).

3. The dynamic brake shoe pressure detection device according to claim 1, wherein On the surface of the metal bottom shell (2) facing the brake shoe, there is a heat insulation cushion layer (5) facing the single-point pressure sensing area (41) of the pressure sensor (4).

4. The dynamic brake shoe pressure detection device according to claim 1, wherein The metal top shell (1) is an arc-shaped curved surface structure adapted to the tile holder, the metal bottom shell (2) is an arc-shaped curved surface structure adapted to the brake shoe, and the shape of the pressure sensor (4) is adapted to the shape of the metal top shell (1).

5. A dynamic brake shoe pressure detection device according to any one of claims 1 or 2, characterized in that, The sheet-shaped gasket (3) is made of a non-metallic material with a low thermal conductivity.

6. A dynamic brake shoe pressure detection device according to any one of claims 1 to 4, characterized in that, Both the metal top shell (1) and the metal bottom shell (2) are made of a metal material with a low thermal conductivity and a high hardness.

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