Protective device for preventing leakage of movable joints in brake pipes of railway vehicles

Abstract

The present invention proposes a protective device for preventing leakage in the brake pipe joints of railway vehicles. The protective device comprises: a sealing pressure plate and a wireless air pressure sensor device, each mounted on either side of the brake pipe joint. The sealing pressure plate comprises a first protective pressure plate and a second protective pressure plate, each of which is respectively fitted onto either side of the brake pipe joint. Sealant is applied to the joint gap, and the wireless air pressure sensor device wirelessly transmits an alarm signal to an onboard alarm host when it detects a pressure value exceeding a safety threshold. The present invention utilizes a secondary sealing device at the brake pipe joint joint. After applying a special sealant to both sides of the joint, the joint is sealed with a special sealing pressure plate and secured with screws. This achieves secondary sealing of the joint gap, ensuring driving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a protective device for preventing leakage of a movable joint of a brake pipeline of a rail vehicle. Background Art

[0002] Today's railway locomotives and rolling stock are spread across the country, traveling thousands of kilometers daily. Due to the rapid fluctuations in weather conditions across the country, dampness, cold weather, and humidity often cause leaks in the brake line connections of these locomotives and rolling stock. Furthermore, due to the large number of locomotives and rolling stock, each carriage has multiple pipe joints. Once an air leak occurs in the brake line, it is difficult to locate and can endanger vehicle safety. Summary of the Invention

[0003] The object of the present invention is to solve at least one of the technical drawbacks.

[0004] Therefore, the object of the present invention is to provide a protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe.

[0005] To achieve the above-mentioned object, an embodiment of the present invention provides a protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe, comprising:

[0006] Installed on both sides of the flexible joint at the connection of the brake pipe, the protective device includes: a sealing pressure plate and a wireless air pressure sensor device, wherein,

[0007] The sealing pressure plate includes a first protective pressure plate and a second protective pressure plate, which are respectively sleeved on both sides of the flexible joint at the connection point of the brake pipe. Screw holes are respectively provided on the upper and lower parts of the first protective pressure plate and the second protective pressure plate. Sealant is applied to the gap of the flexible joint. After the first and second protective pressure plates squeeze the sealant, bolts and nuts are used to pass through the screw holes to connect the first and second protective pressure plates together and fix them on the flexible joint.

[0008] The wireless air pressure sensor device is pasted on the side of the flexible joint, and a strong adhesive tape is used to wrap the wireless air pressure sensor along the outer edge of the sealant sheet on both sides to form a vacuum state. The wireless air pressure sensor device is used to detect the pressure value at the gap of the flexible joint. When the pressure value detected exceeds the safety threshold, an alarm signal is wirelessly sent to the vehicle-mounted alarm host, wherein the alarm signal includes the unique address code of the wireless air pressure sensor device; the vehicle-mounted alarm host displays the received address code for the on-duty personnel in the vehicle to locate the leakage position of the flexible joint according to the address code, wherein each address code corresponds to a flexible joint and is used to mark the position of the flexible joint.

[0009] Furthermore, the sealant is made of single-component silicone rubber, has sealing properties, is resistant to water, gasoline, engine oil, aging, high and low temperatures, and can be vulcanized at room temperature.

[0010] Furthermore, the first protective pressure plate and the second protective pressure plate are made of nylon or metal.

[0011] Furthermore, the first protective pressure plate and the second protective pressure plate are in the form of a single-piece sealing pressure plate, and are sleeved on the outer side of the flexible joint along the radial direction.

[0012] Further, the first protective pressure plate includes: a first semicircular upper component and a first semicircular lower component, wherein the inner edge shapes of the first semicircular upper component and the first semicircular lower component both match the outer edge shape of the movable joint, the upper portion of the first semicircular upper component is provided with the screw hole, and the bottom surface is provided with a groove portion, the lower portion of the first semicircular lower component is provided with the screw hole, and the top surface is provided with a protrusion portion, and the first semicircular upper component and the first semicircular lower component are plugged into and matched with the groove portion and the protrusion portion to form the first protective pressure plate;

[0013] The second protective pressure plate includes: a second semicircular ring-shaped upper component and a second semicircular ring-shaped lower component, wherein the inner edge shapes of the second semicircular ring-shaped upper component and the second semicircular ring-shaped lower component both match the outer edge shape of the movable joint, the upper part of the second semicircular ring-shaped upper component is provided with the screw hole, and the bottom surface is provided with a protrusion, the lower part of the second semicircular ring-shaped lower component is provided with the screw hole, and the top surface is provided with a groove, and the second semicircular ring-shaped upper component and the second semicircular ring-shaped lower component are plugged into each other through the protrusion and the groove to form the second protective pressure plate.

[0014] Furthermore, the first protective pressure plate and the second protective pressure plate are in the form of double-piece sealing pressure plates, wherein:

[0015] The first protective pressure plate includes: a first inner ring component, a first outer ring component sleeved on the outside of the first inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the first outer ring component;

[0016] The second protective pressure plate includes: a second inner ring component, a second outer ring component sleeved on the outside of the second inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the second outer ring component;

[0017] The first outer ring component is rotatably mounted on the outside of the first inner ring component, and the second outer ring component is rotatably mounted on the outside of the second inner ring component. Bolts and nuts are passed through the screw holes to connect the first outer ring component and the second outer ring component are fixed to the flexible joint.

[0018] Furthermore, the first inner ring component includes: a third semicircular upper component and a third semicircular lower component, wherein the inner edge shapes of the third semicircular upper component and the third semicircular lower component both match the outer edge shape of the movable joint, a groove portion is provided on the bottom surface of the third semicircular upper component, and a protrusion portion is provided on the top surface of the third semicircular lower component, and the third semicircular upper component and the third semicircular lower component are plugged into and fitted with the protrusion portion and the groove portion to form the first inner ring component;

[0019] The second inner ring component includes: a fourth semicircular ring upper component and a fourth semicircular ring lower component, wherein the inner edge shapes of the fourth semicircular ring upper component and the fourth semicircular ring lower component both match the outer edge shape of the movable joint, a groove portion is provided on the bottom surface of the fourth semicircular ring upper component, and a protrusion portion is provided on the top surface of the fourth semicircular ring lower component. The fourth semicircular ring upper component and the fourth semicircular ring lower component form the second inner ring component through the plug-in cooperation between the protrusion portion and the groove portion.

[0020] Furthermore, the first outer ring component includes: a fifth semicircular upper component and a fifth semicircular lower component, wherein the left side of the fifth semicircular upper component is a step portion and a side groove, the right side of the fifth semicircular upper component is a protrusion, the left side of the fifth semicircular lower component is a step portion and a side groove, and the right side of the fifth semicircular lower component is a protrusion, and the first outer ring component is formed by plugging and fitting the corresponding side grooves and protrusions; the outer edge of the first inner ring component abuts against the step portion of the first outer ring component;

[0021] The second outer ring component includes: a sixth semicircular ring upper component and a sixth semicircular ring lower component, wherein the left side of the sixth semicircular ring upper component is a step portion and a side groove, the right side of the sixth semicircular ring upper component is a protrusion, the left side of the sixth semicircular ring lower component is a step portion and a side groove, and the right side of the sixth semicircular ring lower component is a protrusion, and the second outer ring component is formed by plugging and fitting the corresponding side grooves and protrusions; the outer edge of the second inner ring component abuts against the step portion of the second outer ring component.

[0022] Furthermore, the first and second protective pressure plates are axially sleeved on the outside of the flexible joint to enclose the flexible joint. The first and second protective pressure plates are both semi-cylinders with a U-shaped cross-section, and when assembled, they enclose the flexible joint. Furthermore, the wireless air pressure sensor device includes a pressure sensor, a controller, and a wireless transmission circuit. The pressure sensor is used to detect the pressure signal at the connector gap and transmit the pressure signal to the controller. The controller analyzes the pressure signal and, when it determines that the pressure exceeds the safety threshold, wirelessly transmits an alarm signal to the vehicle-mounted alarm host via the wireless transmission device.

[0023] According to an embodiment of the present invention, a protective device for preventing leakage in the brake pipe joints of railway vehicles utilizes a secondary sealing device at the joint where the brake pipe is connected. After applying a special sealant to both sides of the joint, a special sealing plate is used to seal the joint, and the seal is secured with screws. This achieves a secondary seal at the joint gap, ensuring driving safety. Furthermore, the present invention includes a pressure detection device that measures the pressure at the joint gap. Once a leak is detected, an alarm is immediately transmitted wirelessly to the on-board alarm host, allowing on-board personnel to immediately issue a warning and arrange troubleshooting, further ensuring vehicle driving safety.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0026] Figures 1a to 1d A structural diagram of a first semicircular upper component in the form of a single-piece sealing pressure plate according to an embodiment of the present invention;

[0027] Figures 2a to 2d A structural diagram of a first semicircular ring-shaped lower component in the form of a single-piece sealing pressure plate according to an embodiment of the present invention;

[0028] Figures 3a to 3d Schematic diagram of the assembly of a protective pressure plate in the form of a single-piece sealing pressure plate according to an embodiment of the present invention;

[0029] Figures 4a to 4c 2. It is a structural diagram of an inner ring component in the form of a double-piece sealing pressure plate according to an embodiment of the present invention;

[0030] Figure 5a and Figure 5b This is a structural diagram of an outer ring component in the form of a double-piece sealing pressure plate according to an embodiment of the present invention;

[0031] Figure 6 is a cross-sectional view taken along line AA of an outer ring component according to an embodiment of the present invention;

[0032] Figure 7 is a BB-cross-sectional view of an outer ring component according to an embodiment of the present invention;

[0033] Figure 8 is a CC-cross-sectional view of an outer ring component according to an embodiment of the present invention;

[0034] Figures 9a to 9f Schematic diagram of the assembly of a protective pressure plate in the form of a double-piece sealing pressure plate according to an embodiment of the present invention;

[0035] Figure 10 is a circuit diagram of a controller according to an embodiment of the present invention;

[0036] Figure 11 FIG. 4 is a circuit diagram of a wireless transmitting circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0038] The protective device for preventing leakage of a rail vehicle brake pipe joint according to an embodiment of the present invention comprises: a protective device installed on both sides of the joint at the brake pipe connection, and the protective device comprises: a sealing pressure plate and a wireless air pressure sensor device.

[0039] Specifically, the sealing pressure plate includes a first protective pressure plate and a second protective pressure plate, which are respectively sleeved on both sides of the flexible joint at the brake pipe connection. Screw holes are respectively provided on the upper and lower parts of the first protective pressure plate and the second protective pressure plate. Sealant is applied to the gap of the flexible joint. After the first protective pressure plate and the second protective pressure plate squeeze the sealant, bolts and nuts are used to pass through the screw holes to connect the first protective pressure plate and the second protective pressure plate together and fix them on the flexible joint.

[0040] In the embodiments of the present invention, the sealant utilizes a one-component silicone rubber developed by our company. It exhibits excellent sealing properties and is resistant to water, gasoline, engine oil, and aging. It vulcanizes (cures) at room temperature and is heat and low-temperature resistant (-60°C to +300°C). It also offers high-pressure resistance (no less than 9.8 MPa at temperatures of 25°C, 30°C, and 150°C). After curing, the sealant is easily disassembled, ensuring no hindrance to vehicle maintenance or component replacement. After disassembly, the cured sealant can be cleaned with a knife, leaving no residual adhesive residue on the flexible joints.

[0041] The first and second protective pressure plates are special pipe joint pressure plates, made of nylon or metal, which are strong and durable and have good sealing performance.

[0042] In an embodiment of the present invention, the first protective pressure plate and the second protective pressure plate may take one of the following forms:

[0043] (1) Single-piece sealing pressure plate form: The first protective pressure plate and the second protective pressure plate are located on both sides of the flexible joint, and the protective pressure plate on each side adopts a single-piece splicing form.

[0044] (2) Double-piece sealing pressure plate: The first and second protective pressure plates are located on both sides of the flexible joint and are radially sleeved on the outside of the flexible joint. The protective pressure plates on each side are composed of two layers, the inner and outer rings.

[0045] (3) Axial sleeve type: The first protective pressure plate and the second protective pressure plate are respectively sleeved on the outer periphery of the flexible joint along the axial direction.

[0046] The structures of these three types of sealing pressure plates are described in detail below:

[0047] (1) The first protective pressure plate and the second protective pressure plate are in the form of a single-piece sealing pressure plate, which is radially sleeved on the outer side of the flexible joint.

[0048] The first protective pressure plate includes: a first semicircular ring upper component and a first semicircular ring lower component.

[0049] like Figures 1a to 1d As shown, the inner edge shapes of the first semicircular upper component 1 and the first semicircular lower component 2 match the outer edge shape of the movable joint. The upper portion of the first semicircular upper component is provided with a screw hole 11, and the bottom surface is provided with a first groove portion 12.

[0050] like Figures 2a to 2d As shown, a screw hole 21 is provided at the lower portion of the first semicircular ring lower component 2, and a protrusion 22 is provided on the top surface. The first semicircular ring upper component and the first semicircular ring lower component are plugged into and fitted with the first groove portion 12 and the protrusion 22 to form a first protective pressure plate.

[0051] The second protective pressure plate includes: a second semicircular upper component and a second semicircular lower component, wherein the inner edge shapes of the second semicircular upper component and the second semicircular lower component both match the outer edge shape of the movable joint, the upper portion of the second semicircular upper component is provided with a screw hole, and the bottom surface is provided with a protrusion, the lower portion of the second semicircular lower component is provided with a screw hole, and the top surface is provided with a groove, and the second semicircular upper component and the second semicircular lower component are plugged into and matched with the protrusion and the groove to form the second protective pressure plate.

[0052] Figures 3a to 3d This is a schematic diagram of the assembly of a protective pressure plate in the form of a single-piece sealing pressure plate according to an embodiment of the present invention. First, the first protective pressure plate and the second protective pressure plate are assembled from four semi-circular parts, such as Figure 3a Then, the upper and lower semicircular ring parts are combined into a pressure plate, as shown in Figure 3b As shown. Figure 3c As shown in the figure, apply sealant to the gaps of the pipe joints. Figure 3d As shown, the first and second protective pressure plates on the left and right are injected with sealant and then fixed with screws.

[0053] In an embodiment of the present invention, the first semicircular upper component, the first semicircular lower component, the second semicircular upper component, and the second semicircular lower component can all extend a certain thickness along the axial direction of the pipe joint to achieve the first semicircular upper component being connected to the second semicircular upper component, and the first semicircular lower component being connected to the second semicircular lower component, wrapping the joint, thereby achieving a secondary seal at the gap of the pipe joint.

[0054] (2) The first protective pressure plate and the second protective pressure plate are in the form of double-piece sealing pressure plates, which are radially sleeved on the outer side of the flexible joint.

[0055] The first protective pressure plate includes: a first inner ring component, a first outer ring component sleeved on the outside of the first inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the first outer ring component;

[0056] The second protective pressure plate includes: a second inner ring component, a second outer ring component sleeved on the outside of the second inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the second outer ring component;

[0057] The first outer ring component is rotatably sleeved on the outside of the first inner ring component, and the second outer ring component is rotatably sleeved on the outside of the second inner ring component. Bolts and nuts are passed through the screw holes to connect the first outer ring component and the second outer ring component together and fixed on the flexible joint.

[0058] The following describes the structure of the first inner ring component, the second inner ring component, the first outer ring component, and the second outer ring component. It should be noted that the first and second inner ring components are located on the left and right sides of the flexible joint, while the first and second outer ring components are located outside the first and second inner ring components, respectively. This structure ensures a seal for the flexible joint. The first and second inner ring components are fixedly mounted on either side of the flexible joint, and then the first and second outer ring components are sleeved onto the inner ring components, allowing for flexible rotation. Screw holes are provided in the first and second outer ring components. If pipe installation is inconvenient, such as when the pipe is too close to the inner wall for screws to securely fasten the screw holes, the outer ring components can be rotated to move the screw holes outward, making it easier to secure the screw holes.

[0059] Specifically, such as Figures 4a to 4c 、 Figure 9c and Figure 9d As shown, the first inner ring component 100 includes: a third semicircular upper component 101 and a third semicircular lower component 102, wherein the inner edge shapes of the third semicircular upper component 101 and the third semicircular lower component 102 both match the outer edge shape of the movable joint, a second groove portion 120 is provided on the bottom surface of the third semicircular upper component 101, and a protrusion portion 110 is provided on the top surface of the third semicircular lower component 102. The third semicircular upper component 101 and the third semicircular lower component 102 are plugged into and fitted with the protrusion portion 110 and the second groove portion 120 to form the first inner ring component 100.

[0060] like Figure 5a to Figure 5b As shown, the first outer ring component 200 includes: a fifth semicircular upper component 201 and a fifth semicircular lower component 202, wherein the left side of the fifth semicircular upper component 201 is a step portion and a side groove 210, the right side of the fifth semicircular upper component 201 is a protrusion 230, the left side of the fifth semicircular lower component 202 is a step portion and a side groove 210, and the right side of the fifth semicircular lower component 202 is a protrusion 310. The first outer ring component is formed by plugging and fitting the corresponding side grooves and protrusions. The outer edge of the first inner ring component abuts against the step portion of the first outer ring component.

[0061] That is, the structure of the fifth semicircular ring-shaped lower component 202 corresponds to that of the fifth semicircular ring-shaped upper component 201, that is, the fifth semicircular ring-shaped lower component 202 is correspondingly provided with a third groove portion 320 and a protrusion portion 310, which respectively cooperate with the protrusion portion 230 and the third groove portion 320 of the fifth semicircular ring-shaped upper component 201 to form the first outer ring component.

[0062] Figure 6AA cross-sectional view of the outer ring component according to an embodiment of the present invention. Figure 7 BB is a cross-sectional view of the outer ring component according to an embodiment of the present invention. Figure 8 2 is a CC cross-sectional view of an outer ring component according to an embodiment of the present invention.

[0063] The second inner ring component includes: a fourth semicircular ring upper component and a fourth semicircular ring lower component, wherein the inner edge shapes of the fourth semicircular ring upper component and the fourth semicircular ring lower component both match the outer edge shape of the movable joint, a groove portion is provided on the bottom surface of the fourth semicircular ring upper component, and a protrusion portion is provided on the top surface of the fourth semicircular ring lower component. The fourth semicircular ring upper component and the fourth semicircular ring lower component are plugged into and fitted with the protrusion portion and the groove portion to form the second inner ring component.

[0064] The second outer ring component includes: a sixth semicircular ring-shaped upper component and a sixth semicircular ring-shaped lower component, wherein the left side of the sixth semicircular ring-shaped upper component is a stepped portion and a side groove, the right side of the sixth semicircular ring-shaped upper component is a raised portion, the left side of the sixth semicircular ring-shaped lower component is a stepped portion and a side groove, and the right side of the sixth semicircular ring-shaped lower component is a raised portion, and the second outer ring component is formed by plugging and fitting the corresponding side grooves and raised portions; the outer edge of the second inner ring component abuts against the stepped portion of the second outer ring component.

[0065] Figures 9a to 9f Schematic diagram of the assembly of a protective pressure plate in the form of a double-piece sealing pressure plate according to an embodiment of the present invention.

[0066] like Figure 9a As shown, the two semicircular ring parts of the double sealing pressure plate outer ring are assembled. Figure 9b As shown in the figure, the two semicircles of the outer ring of the double sealing pressure plate are in a closed state. Figure 9c As shown, the inner ring of the double sealing pressure plate is assembled into two semicircular shapes. Figure 9d As shown in the figure, the two semicircles of the inner ring of the double sealing pressure plate are in a closed state. Figure 9e As shown in the figure, the inner ring component and the outer ring component are assembled with double sealing pressure plates. Figure 9f As shown, this is the effect diagram after the double sealing pressure plate is assembled.

[0067] In an embodiment of the present invention, the semicircular upper component and the semicircular lower component of the first inner ring component and the second inner ring component can extend a certain thickness along the axial direction of the pipe joint, so as to achieve the corresponding semicircular upper component being connected to the semicircular upper component, and the semicircular lower component being connected to the semicircular lower component, wrapping the joint, thereby achieving secondary sealing of the joint and the gap of the pipe joint.

[0068] (3) The first protective pressure plate and the second protective pressure plate are sleeved on the outer side of the flexible joint along the axial direction.

[0069] Specifically, the flexible joint is wrapped, and the first protective pressure plate and the second protective pressure plate are both semi-cylinders with U-shaped cross-sections, which are spliced ​​together to wrap the flexible joint.

[0070] In summary, the first and second protective pressure plates of the present invention can be sleeved on the outside of the flexible joint along the axial or radial direction of the flexible joint, and both can achieve secondary sealing of the sealing pipe of the flexible joint and the gap of the flexible joint.

[0071] The braking system of rolling stock is crucial to the safety of hundreds of thousands of people. To ensure this, a wireless air pressure sensor is bonded to the side of each brake line joint. The wireless air pressure sensor assembly is affixed to the side of the joint, and strong tape is used to wrap around the sealant sheet on both sides to create a vacuum. Any air leak will be detected by the sensor. The wireless air pressure sensor detects the pressure at the joint gap. If the pressure exceeds a safe threshold, it wirelessly sends an alarm signal to the onboard alarm host. This alarm signal includes the wireless air pressure sensor assembly's unique address code, for example, numbers 001-999.

[0072] The vehicle alarm host displays the received address code, allowing the on-duty personnel to locate the leaking joint based on the address code. Each address code corresponds to a joint and is used to mark the joint's location. In other words, each address code represents the location of a joint. By viewing the address code, the on-duty personnel can determine which joint is faulty and arrange for maintenance personnel to address the problem.

[0073] Specifically, the wireless air pressure sensor device includes: a pressure sensor, a controller and a wireless transmitting circuit, wherein the pressure sensor is used to detect the pressure signal at the gap of the connector and send the pressure signal to the controller. The controller analyzes the pressure signal. When it is judged that the pressure exceeds the safety threshold, the controller sends an alarm signal wirelessly to the vehicle alarm host through the wireless transmitting device. Figure 10 is a circuit diagram of a controller according to an embodiment of the present invention. Figure 11 FIG. 4 is a circuit diagram of a wireless transmitting circuit according to an embodiment of the present invention.

[0074] According to an embodiment of the present invention, a protective device for preventing leakage in the brake pipe joints of railway vehicles utilizes a secondary sealing device at the joint where the brake pipe is connected. After applying a special sealant to both sides of the joint, a special sealing plate is used to seal the joint, and the seal is secured with screws. This achieves a secondary seal at the joint gap, ensuring driving safety. Furthermore, the present invention includes a pressure detection device that measures the pressure at the joint gap. Once a leak is detected, an alarm is immediately transmitted wirelessly to the on-board alarm host, allowing on-board personnel to immediately issue a warning and arrange troubleshooting, further ensuring vehicle driving safety.

[0075] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0076] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments without departing from the principles and intent of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe, characterized in that: Installed on both sides of the flexible joint at the connection of the brake pipe, the protective device includes: a sealing pressure plate and a wireless air pressure sensor device, wherein, The sealing pressure plate includes a first protective pressure plate and a second protective pressure plate, which are respectively sleeved on both sides of the flexible joint at the connection of the brake pipeline. Screw holes are respectively provided on the upper and lower parts of the first protective pressure plate and the second protective pressure plate. Sealant is applied to the gap of the flexible joint. After the first and second protective pressure plates squeeze the sealant, bolts and nuts are used to pass through the screw holes to connect the first and second protective pressure plates together and fix them on the flexible joint. The first and second protective pressure plates are in the form of single-piece sealing pressure plates, which are sleeved on the outer side of the flexible joint in the radial direction; or the first and second protective pressure plates are in the form of double-piece sealing pressure plates, which are sleeved on the outer side of the flexible joint in the radial direction. The wireless air pressure sensor device is pasted on the side of the flexible joint, and a strong adhesive tape is used to wrap the wireless air pressure sensor along the outer edge of the sealant sheet on both sides to form a vacuum state. The wireless air pressure sensor device is used to detect the pressure value at the gap of the flexible joint. When the pressure value detected exceeds the safety threshold, an alarm signal is wirelessly sent to the vehicle-mounted alarm host, wherein the alarm signal includes the unique address code of the wireless air pressure sensor device; the vehicle-mounted alarm host displays the received address code for the on-duty personnel in the vehicle to locate the leakage position of the flexible joint according to the address code, wherein each address code corresponds to a flexible joint and is used to mark the position of the flexible joint.

2. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe according to claim 1, characterized in that: The sealant is made of single-component silicone rubber, has sealing properties, is resistant to water, gasoline, engine oil, aging, high and low temperatures, and can be vulcanized at room temperature.

3. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe according to claim 1, wherein: The first protective pressure plate and the second protective pressure plate are made of nylon or metal.

4. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 1, characterized in that: When the first and second protective pressure plates are in the form of single-piece sealing pressure plates and are radially sleeved on the outer side of the flexible joint, The first protective pressure plate includes: a first semicircular upper component and a first semicircular lower component, wherein the inner edge shapes of the first semicircular upper component and the first semicircular lower component both match the outer edge shape of the movable joint, the upper portion of the first semicircular upper component is provided with the screw hole, and the bottom surface is provided with a groove portion, the lower portion of the first semicircular lower component is provided with the screw hole, and the top surface is provided with a protrusion portion, and the first semicircular upper component and the first semicircular lower component are plugged into and matched with the groove portion and the protrusion portion to form the first protective pressure plate; The second protective pressure plate includes: a second semicircular ring-shaped upper component and a second semicircular ring-shaped lower component, wherein the inner edge shapes of the second semicircular ring-shaped upper component and the second semicircular ring-shaped lower component both match the outer edge shape of the movable joint, the upper part of the second semicircular ring-shaped upper component is provided with the screw hole, and the bottom surface is provided with a protrusion, the lower part of the second semicircular ring-shaped lower component is provided with the screw hole, and the top surface is provided with a groove, and the second semicircular ring-shaped upper component and the second semicircular ring-shaped lower component are plugged into each other through the protrusion and the groove to form the second protective pressure plate.

5. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 1, characterized in that: When the first protective pressure plate and the second protective pressure plate are in the form of double-piece sealing pressure plates and are radially sleeved on the outer side of the flexible joint, The first protective pressure plate includes: a first inner ring component, a first outer ring component sleeved on the outside of the first inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the first outer ring component; The second protective pressure plate includes: a second inner ring component, a second outer ring component sleeved on the outside of the second inner ring component, and screw holes are respectively provided on the upper, lower, left and right parts of the second outer ring component; The first outer ring component is rotatably mounted on the outside of the first inner ring component, and the second outer ring component is rotatably mounted on the outside of the second inner ring component. Bolts and nuts are passed through the screw holes to connect the first outer ring component and the second outer ring component are fixed to the flexible joint.

6. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 5, characterized in that: The first inner ring component comprises: a third semicircular ring upper component and a third semicircular ring lower component, wherein the inner edge shapes of the third semicircular ring upper component and the third semicircular ring lower component both match the outer edge shape of the movable joint, a groove is provided on the bottom surface of the third semicircular ring upper component, and a protrusion is provided on the top surface of the third semicircular ring lower component, and the third semicircular ring upper component and the third semicircular ring lower component are plugged into each other through the protrusion and the groove to form the first inner ring component; The second inner ring component includes: a fourth semicircular ring upper component and a fourth semicircular ring lower component, wherein the inner edge shapes of the fourth semicircular ring upper component and the fourth semicircular ring lower component both match the outer edge shape of the movable joint, a groove portion is provided on the bottom surface of the fourth semicircular ring upper component, and a protrusion portion is provided on the top surface of the fourth semicircular ring lower component. The fourth semicircular ring upper component and the fourth semicircular ring lower component form the second inner ring component through the plug-in cooperation between the protrusion portion and the groove portion.

7. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 5, characterized in that: The first outer ring component comprises: a fifth semicircular upper component and a fifth semicircular lower component, wherein the left side of the fifth semicircular upper component is a step portion and a side groove, the right side of the fifth semicircular upper component is a protrusion, the left side of the fifth semicircular lower component is a step portion and a side groove, and the right side of the fifth semicircular lower component is a protrusion, and the first outer ring component is formed by plugging and fitting the side grooves and the protrusions of the fifth semicircular shape; the outer edge of the first inner ring component abuts against the step portion of the first outer ring component; The second outer ring component includes: a sixth semicircular upper component and a sixth semicircular lower component, wherein the left side of the sixth semicircular upper component is a step portion and a side groove, the right side of the sixth semicircular upper component is a protrusion, the left side of the sixth semicircular lower component is a step portion and a side groove, and the right side of the sixth semicircular lower component is a protrusion, and the second outer ring component is formed by the plug-in fit of the side groove and the protrusion of the sixth semicircular ring; the outer edge of the second inner ring component abuts against the step portion of the second outer ring component.

8. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 1, characterized in that: The first protective pressure plate and the second protective pressure plate are axially sleeved on the outside of the flexible joint to wrap the flexible joint. The first protective pressure plate and the second protective pressure plate are both semi-cylinders with U-shaped cross-sections, which wrap the flexible joint after splicing.

9. The protective device for preventing leakage of a flexible joint of a railway vehicle brake pipe as claimed in claim 1, characterized in that: The wireless air pressure sensor device includes: a pressure sensor, a controller and a wireless transmission circuit, wherein the pressure sensor is used to detect the pressure signal at the gap of the connector and send the pressure signal to the controller. The controller analyzes the pressure signal and, when it is determined that the pressure exceeds the safety threshold, wirelessly sends an alarm signal to the vehicle-mounted alarm host through the wireless transmission circuit.

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