A portable tester for testing the performance of single railway freight cars

Abstract

The present invention provides a portable tester for testing the performance of a single railway freight car, which belongs to the technical field of railway freight car testing equipment. It includes a shell and a gas pipeline. The gas pipeline includes a plurality of pipe joints, and two adjacent pipe joints are spliced with each other. The shell has a placement space suitable for accommodating the gas pipeline, and one side of the shell has an opening connected to the placement space. One end of the gas pipeline is connected to the gas source through a pipeline, and the other end is connected to the joint through a pipeline. It also includes a connecting frame, a mounting plate, a supporting part, a clamping part and a fixing structure. After the pipe joint and the hexagonal prism are placed in the first receiving groove and the second receiving groove respectively, the gas pipeline can be supported and the gas pipeline can be axially limited. The clamping part can be pressed against the pipe joint by plugging the mounting plate into the connecting frame, thereby facilitating radial limitation of the gas pipeline, thereby facilitating fixing the gas pipeline in the shell. Through the above arrangement, installation is convenient and labor intensity can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of railway freight car testing equipment, and in particular relates to a portable tester for single-car performance testing of railway freight cars. Background Art

[0002] In order to ensure the assembly quality and efficiency of the railway freight car brake system, vehicle leakage detection, brake cylinder stroke adjustment and other tests are generally carried out before the vehicle single vehicle test. The detection equipment in the prior art includes a shell, a gas pipeline and a joint arranged in the shell; the air inlet of the gas pipeline is connected to the gas source through an air pipe, and the air outlet of the gas pipeline is connected to the joint through an air pipe; the joint is connected to the air inlet of the brake cylinder. During the test, by filling the air inlet of the brake cylinder with pressurized gas, the piston rod of the brake cylinder can be extended, and the length of the extended piston rod can be judged based on the length of the extended piston rod. When the extended length of the piston rod needs to be adjusted, the pressurized gas in the brake cylinder is first discharged, and then the extended length of the brake cylinder piston rod is adjusted. After adjusting the length of the brake cylinder, pressurized gas is continued to be filled into the brake cylinder, and then the extended length of the brake cylinder piston rod is observed to see whether it meets the requirements. It should be noted that the adjustment process of the brake cylinder piston rod stroke is a prior art and will not be described in detail here.

[0003] The gas line also has a downward-facing exhaust port, and solenoid valves are installed at both the gas inlet and exhaust ports. When pressurized gas is being introduced into the brake cylinder, the solenoid valve at the gas line's inlet opens, while the solenoid valve at the exhaust port closes, allowing pressurized gas from the source to flow through the gas line and into the brake cylinder. To exhaust pressurized gas from the brake cylinder, the solenoid valve at the gas line's inlet closes, while the solenoid valve at the exhaust port opens, allowing the pressurized gas in the brake cylinder to flow through the gas line and out the exhaust port.

[0004] The gas pipeline is assembled from a number of pipe joints. The outer wall of the pipe joint is fixed with a hexagonal prism for cooperating with a wrench. The hexagonal prism is fixed to the outer wall of the pipe joint, and the diameter of the hexagonal prism is larger than the diameter of the two ends of the pipe joint. After the gas pipeline is assembled, it needs to be placed in the shell. A U-shaped plate is placed around the outer wall of the gas pipeline, and the U-shaped plate is fixed to the shell with bolts, thereby fixing the gas pipeline in the shell. Since the solenoid valve at the exhaust port of the gas pipeline is located below the gas pipeline, in order to avoid blocking the solenoid valve at the exhaust port, when installing the gas pipeline, an escape space is left between the solenoid valve at the exhaust port and the bottom wall of the shell.

[0005] In the process of fixing the gas pipeline, at least both ends of the gas pipeline need to be fixed to ensure the stability of the gas pipeline; since a clearance space needs to be left between the gas pipeline and the bottom wall of the shell during installation, when installing one end of the gas pipeline, the other end of the gas pipeline needs to be manually lifted to ensure smooth installation; the above installation process can easily cause fatigue to the operator, and there is a safety hazard of the gas pipeline falling downwards. Summary of the Invention

[0006] The embodiment of the present invention provides a portable tester for testing the performance of a single railway freight car, aiming to solve the technical problem in the prior art that the installation of gas pipelines easily causes fatigue to operators and poses a safety hazard.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A portable tester for testing the performance of a single railway freight car is provided, comprising a housing and a gas pipeline, wherein the gas pipeline comprises a plurality of pipe joints, and two adjacent pipe joints are spliced together; the housing has a placement space suitable for accommodating the gas pipeline, and one side of the housing has an opening communicating with the placement space; one end of the gas pipeline is connected to a gas source via a pipe, and the other end is connected to the joint via a pipe; the portable tester also comprises:

[0009] a connecting frame, disposed in the shell at a side opposite to the opening, with a fixing cavity formed between the connecting frame and the inner side wall of the shell;

[0010] A mounting plate adapted to be plugged into and fitted with the connection frame; and

[0011] A support portion is fixed to a side of the mounting plate facing the opening; the support portion has a first receiving groove extending vertically through its thickness at one end facing the opening, and a sidewall of the support portion has a second receiving groove extending horizontally through its thickness; the first receiving groove is suitable for receiving a pipe joint, and the second receiving groove is suitable for receiving a hexagonal prism to axially limit the pipe joint;

[0012] There are at least two supporting parts, each of which is used to support the pipe joints at both ends of the gas pipeline; the mounting plate is provided with a connecting groove horizontally on the outer periphery of the supporting part, and the connecting groove is suitable for communicating with the fixing cavity;

[0013] The portable tester also includes a clamping portion and a fixing structure, one end of the clamping portion is hinged to the connecting groove, and the axis of the hinge is arranged in the up and down directions; the clamping portion is provided with a protrusion at the hinge, and the protrusion is suitable for rotating the clamping portion in a direction close to the pipe joint during contact with the side wall of the shell to radially limit the pipe joint; the fixing structure is suitable for immediately fixing the position of the mounting plate after the mounting plate slides into place, so that the clamping portion maintains the state of radially limiting the pipe joint.

[0014] In a possible implementation, the clamping portion is an arc-shaped structure, and the concave surface is adapted to face the pipe joint; after the mounting plate is installed in place, the end of the clamping portion facing away from the hinge is adapted to span the first accommodating groove.

[0015] In one possible implementation, the end of the protrusion facing away from the clamping portion is a bent end, and the outer wall surface of the bent end is suitable for contacting the inner wall surface of the shell; wherein, the outer wall surface of the bent end is provided with a plurality of rollers spaced apart along the up and down directions, and the rollers are rotatably matched with the bent end, and the axis is along the up and down directions; the rollers are suitable for contacting the inner wall surface of the shell.

[0016] In one possible implementation, the clamping portion is provided with a first elastic member at a hinged position, and both ends of the first elastic member are respectively connected to the clamping portion and the mounting plate; the first elastic member is used to provide torque to the clamping portion so that the clamping portion clamps the pipe joint when the pipe joint is installed with the support portion.

[0017] In a possible implementation, an abutment portion is fixedly provided on the inner wall of the shell at the position of the fixing cavity, and the abutment portion is suitable for contacting the inner side wall of the mounting plate to limit the mounting plate.

[0018] In some embodiments, an elastic pad is connected to one end of the abutting portion facing the mounting plate, and the elastic pad is suitable for contacting the inner side of the mounting plate.

[0019] In one possible implementation, the outer peripheral wall of the mounting plate contacts the inner peripheral wall of the connecting frame, and a limiting groove is provided on the inner bottom wall of the connecting frame extending through the thickness thereof in the vertical direction; the fixing structure includes:

[0020] a limiting portion, plugging and cooperating with the limiting groove in the up-down direction, with the top of the limiting portion protruding from the bottom wall of the connecting frame; and

[0021] a second elastic member, sleeved on the limiting portion, with two ends of the second elastic member respectively connected to the limiting portion and the connecting frame to provide an elastic force to the limiting portion in an up-down direction;

[0022] In which, a slope is provided on the side of the protruding end of the limiting portion facing the opening of the connecting frame, and the slope of the protruding end of the limiting portion faces the top of the connecting frame; during the plug-in connection between the mounting plate and the connecting frame, the protruding portion of the limiting portion is pressed into the limiting groove; after the mounting plate is plugged into place, the limiting groove is located on the outside of the mounting plate, and the limiting portion protrudes out of the limiting groove under the elastic force of the second elastic member and contacts the outside of the mounting plate.

[0023] In some embodiments, the limiting grooves are provided at intervals along the length direction of the connecting frame, and the fixing structures are multiple and correspond one to one with the limiting grooves.

[0024] Wherein, the portable tester further includes a connecting rod, which is horizontally arranged and connected to the plurality of limiting parts.

[0025] In an embodiment of the present application, when installing a gas pipeline, the pipe joint on the gas pipeline is placed in the first receiving groove of the support portion, and the hexagonal prism on the pipe joint is placed in the second receiving groove; then the mounting plate is plugged into the connection frame. During the insertion of the mounting plate, the protrusion on the inner side of the mounting plate contacts the inner wall surface of the shell, thereby causing the protrusion and the clamping portion to rotate around the hinge position; at this time, the clamping portion can press against the outer peripheral wall of the pipe joint, thereby facilitating radial positioning of the pipe joint and fixing the gas pipeline in the shell. After the mounting plate is plugged into place, the position of the mounting plate is fixed by a fixing structure, thereby facilitating the clamping portion to maintain a clamped state, thereby facilitating radial positioning of the pipe joint.

[0026] The portable tester for testing the performance of single railway freight cars provided by the present invention, compared to existing technologies, can support and axially limit the gas pipeline after the pipe joint and hexagonal prism are placed in the first and second receiving grooves, respectively. The mounting plate and the connecting frame are connected to each other, allowing the clamping portion to press against the pipe joint, thereby facilitating radial positioning of the gas pipeline and thus facilitating the fixing of the gas pipeline within the housing. This arrangement facilitates installation and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a portable tester for testing the performance of a single railway freight car provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle;

[0029] Figure 3 A cross-sectional view of a portable tester for testing the performance of a single railway freight car provided by an embodiment of the present invention;

[0030] Figure 4for Figure 3 A magnified schematic diagram of part B in the middle;

[0031] Figure 5 A schematic diagram of a connection frame portion of a portable tester for testing the performance of a single railway freight car provided by an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of a clamping portion of a portable tester for testing the performance of a single railway freight car provided by an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the roller portion of a portable tester for testing the performance of a single railway freight car provided by an embodiment of the present invention.

[0034] Explanation of the accompanying drawings: 1. Shell; 11. Placement space; 12. Opening; 13. Oil-water separator; 14. Tee; 15. First air valve; 16. Second air valve; 17. Exhaust valve; 18. Pressure gauge; 19. Rotating shaft; 191. Traveling wheel; 2. Gas pipeline; 21. Pipe joint; 211. Hexagonal prism; 22. Hose; 23. First pipeline; 24. Second pipeline; 3. Connecting frame; 31. Fixing cavity; 32. Abutment portion; 33. Limiting groove; 4. Mounting plate; 41. Connecting groove; 5. Support portion; 51. First accommodating groove; 52. Second accommodating groove; 6. Clamping portion; 61. Protrusion; 611. Bending end; 612. Roller; 7. Fixing structure; 71. Limiting portion; 711. Inclined surface; 72. Second elastic member; 73. Connecting rod; 8. Door. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Please also refer to Figures 1 to 7Now, a portable tester for single-vehicle performance testing of railway freight cars provided by the present invention is described. The portable tester for testing the performance of a single railway freight car comprises a shell 1 and a gas pipeline 2, the gas pipeline 2 comprises a plurality of pipe joints 21, and two adjacent pipe joints 21 are spliced with each other; the pipe joints 21 are prior art and are not described in detail here; the shell 1 is provided with a placement space 11 suitable for accommodating the gas pipeline 2, and one side of the shell 1 is provided with an opening 12 connected to the placement space 11; one end of the gas pipeline 2 is connected to the gas source through a pipeline, and the other end is connected to the joint through a pipeline; the other end of the gas pipeline 2 can be connected to the brake cylinder through the pipeline and the joint, and the above connection method is prior art and is not described in detail here; the above pipeline is a hose 22; the portable tester also comprises a connecting frame 3, a mounting plate 4 and a support part 5; the connecting frame 3 is arranged on the side opposite to the opening 12 in the shell 1, and a fixed cavity 31 is formed between the connecting frame 3 and the inner side wall of the shell 1; the mounting plate 4 is suitable for plugging and matching with the connecting frame 3; the support part 5 is fixed to the side of the mounting plate 4 facing the opening 12; the end of the support part 5 facing the opening 12 has an upper A first accommodating groove 51 extends through its thickness in the downward direction, and the side wall of the support part 5 has a second accommodating groove 52 extends through its thickness in the horizontal direction; the first accommodating groove 51 is suitable for placing the pipe joint 21, and the second accommodating groove 52 is suitable for placing the hexagonal prism 211 to axially limit the pipe joint 21; wherein, there are at least two support parts 5, and the two support parts 5 are respectively used to support the pipe joints 21 at both ends of the gas pipeline 2; the mounting plate 4 is provided with a connecting groove 41 horizontally on the outer periphery of the support part 5, and the connecting groove 41 is suitable for communicating with the fixed cavity 31; the portable tester also includes a clamping part 6 and a fixing structure 7, one end of the clamping part 6 is hinged to the connecting groove 41, and the axis of the hinge is arranged along the up and down direction; the clamping part 6 is provided with a protrusion 61 at the hinge, and the protrusion 61 is suitable for rotating the clamping part 6 in the direction close to the pipe joint 21 during the contact with the side wall of the shell 1 to radially limit the pipe joint 21; the fixing structure 7 is suitable for fixing the position of the mounting plate 4 immediately after the mounting plate 4 slides into place, so that the clamping part 6 maintains the state of radially limiting the pipe joint 21.

[0037] In the embodiment of the present application, when installing the gas pipeline 2, the pipe joint 21 on the gas pipeline 2 is placed in the first receiving groove 51 of the support portion 5, and the hexagonal prism 211 on the pipe joint 21 is placed in the second receiving groove 52; then the mounting plate 4 is inserted into the connecting frame 3. During the insertion of the mounting plate 4, the protrusion 61 on the inner side of the mounting plate 4 contacts the inner wall surface of the shell 1, thereby causing the protrusion 61 and the clamping portion 6 to rotate around the hinge position; at this time, the clamping portion 6 can press against the outer peripheral wall of the pipe joint 21, thereby facilitating radial positioning of the pipe joint 21 and fixing the gas pipeline 2 in the shell 1. After the mounting plate 4 is inserted into place, the position of the mounting plate 4 is fixed by the fixing structure 7, so that the clamping portion 6 can maintain a clamped state, thereby facilitating radial positioning of the pipe joint 21.

[0038] Compared to the prior art, the portable tester provided by the present invention for testing the performance of single railway freight cars supports and axially limits the gas pipeline 2 after the pipe joint 21 and the hexagonal prism 211 are placed in the first and second receiving grooves 51 and 52, respectively. The mounting plate 4 is connected to the connecting frame 3 to force the clamping portion 6 against the pipe joint 21, thereby facilitating radial limiting of the gas pipeline 2 and thus facilitating securing the gas pipeline 2 within the housing 1. This arrangement facilitates installation and reduces labor intensity.

[0039] It should be noted that the gas pipeline 2 includes a horizontally arranged first pipeline 23 and a vertically arranged second pipeline 24. There are four second pipelines 24, each of which is connected to the first pipeline 23; three of the second pipelines 24 are arranged downward, and the last second pipeline 24 is arranged upward. One end of the first pipeline 23 is an air inlet, and the other end is an air outlet; the upward-facing second pipeline 24 can also serve as an air inlet pipeline. An oil-water separator 13 for air pressure regulation is fixedly installed in the shell 1. The oil-water separator 13 can filter the pressurized gas entering the gas pipeline 2 to meet the vehicle's air source purification requirements. The air inlet of the oil-water separator 13 is connected to the air source via a pipe, a hose 22. The air outlet of the oil-water separator 13 is provided with a tee 14. One outlet of the tee 14 is connected to a first air valve 15, which is fixed to the side wall of the housing 1, via a pipe. The other outlet of the tee 14 is connected to a second air valve 16 via a pipe, a hose 22. The outlet of the first air valve 15 is connected to the air inlet of a first pipeline 23, while the outlet of the second air valve 16 is connected to an upwardly directed second pipeline 24 via a pipe. Each of the three downwardly directed second pipelines 24 is connected to an exhaust valve 17. A pressure gauge 18 is connected to the first pipeline 23 via a hose 22. The second air valve 16 has a larger opening than the first valve 15, so the air is filled at a faster rate than the first valve 15, allowing pressurized air to be introduced into the brake cylinder at different rates. The exhaust valve 17 on the second pipeline 24 can exhaust the pressurized gas in the brake cylinder when in the open state.

[0040] In this embodiment, the inflation process of the first air valve 15 is used as an example. When the first air valve 15 is open, the second air valve 16, and all exhaust valves 17 are closed. Pressurized gas can enter the brake cylinder through the gas line 2, thereby extending the brake cylinder's piston rod. The first air valve 15 is then closed, maintaining pressure in the gas line 2 and the brake cylinder, allowing the brake cylinder's sealing performance to be tested. When the test is complete or the stroke of the brake cylinder's piston rod needs to be adjusted, the exhaust valve 17 is opened to release the pressurized gas within the brake cylinder.

[0041] For example, a rotating shaft 19 is provided at the bottom of the housing 1, and both ends of the rotating shaft 19 are rotatably provided with running wheels 191; there are two rotating shafts 19, one at each end of the bottom of the housing 1; the four running wheels 191 on the two rotating shafts 19 facilitate pushing the housing 1, thereby facilitating the movement of the housing 1 to a designated position. A door 8 is hingedly connected to one side of the housing 1 having an opening 12, which can be used to close the opening 12 of the housing 1, thereby facilitating the protection of the components within the housing 1. The first air valve 15, the second air valve 16, and the exhaust valve 17 are all solenoid valves; a controller is provided within the housing 1, which is electrically connected to the first air valve 15, the second air valve 16, and all the exhaust valves 17; a remote receiving module is provided on the controller, and the operator can transmit control signals to the remote receiving module via a remote control, thereby controlling the first air valve 15, the second air valve 16, and the exhaust valve 17 via the controller. It should be noted that the process of transmitting control signals to the remote receiving module via a remote control is prior art and will not be described in detail here. A power supply is also provided in the housing 1 , and the power supply is electrically connected to the controller, the first air valve 15 , the second air valve 16 and the exhaust valve 17 ; the power supply can supply power to the controller, the first air valve 15 , the second air valve 16 and the exhaust valve 17 .

[0042] In some embodiments, as Figures 1 to 7 The clamping portion 6 is an arc-shaped structure, and the concave surface is adapted to face the pipe joint 21; after the mounting plate 4 is installed in place, the end of the clamping portion 6 facing away from the hinge is adapted to span the first receiving groove 51. Through the above arrangement, when the mounting plate 4 is installed, the protrusion 61 contacts the side wall inside the housing 1, and during the sliding process of the mounting plate 4, the protrusion 61 moves horizontally toward one side of the connecting frame 3, thereby causing the clamping portion 6 to rotate toward the pipe joint 21, and finally causing the clamping portion 6 to span the opening 12 of the first receiving groove 51, limiting the pipe joint 21 in the diameter direction and limiting the pipe joint 21 on the support portion 5, thereby preventing the pipe joint 21 from detaching from the support portion 5 in the front-to-back direction.

[0043] In some embodiments, as Figures 1 to 7The end of the protrusion 61 facing away from the clamping portion 6 is a curved end 611, and the outer wall surface of the curved end 611 is suitable for contacting the inner wall surface of the shell 1; wherein, the outer wall surface of the curved end 611 is provided with a plurality of rollers 612 spaced apart in the vertical direction, and the rollers 612 are rotatably engaged with the curved end 611, and the axis is along the vertical direction; the rollers 612 are suitable for contacting the inner wall surface of the shell 1. The inner wall surface of the curved end 611 is a concave surface, and the concave surface always faces the mounting plate 4. During the plugging process between the mounting plate 4 and the connecting frame 3, the rollers 612 contact the inner wall surface of the shell 1 and slide toward the edge position of the connecting frame 3, thereby enabling the clamping portion 6 to cross the first receiving groove 51 and radially limit the pipe joint 21. By rotating the rollers 612 and the inner wall surface of the shell 1, the wear of the protrusion 61 and the inner wall surface of the shell 1 can be reduced, thereby facilitating the improvement of the service life of the protrusion 61. Both sides of the clamping portion 6 are in contact with both sides of the connecting groove 41 respectively, and the protruding portion 61 is fixed at the hinge of the clamping portion 6 .

[0044] In some embodiments, as Figures 1 to 7 The clamping portion 6 is provided with a first elastic member (not shown) at the hinged position. The two ends of the first elastic member are respectively connected to the clamping portion 6 and the mounting plate 4. The first elastic member is used to provide torque to the clamping portion 6, so that the clamping portion 6 can clamp the pipe joint 21 when the pipe joint 21 is installed on the support portion 5. The first elastic member includes a torsion spring, which is mounted on the hinge shaft. The two ends of the torsion spring are respectively fixed to the clamping portion 6 and the mounting plate 4. The torsion spring can provide torque to the clamping portion 6, facilitating the clamping portion 6 to initially clamp the pipe joint 21, thereby initially limiting the diameter of the pipe joint 21.

[0045] In some embodiments, as Figures 1 to 7 An abutment portion 32 is fixedly provided on the inner wall of the housing 1 at the position of the fixing cavity 31. The abutment portion 32 is adapted to contact the inner sidewall of the mounting plate 4 to limit the position of the mounting plate 4. An elastic pad is connected to the end of the abutment portion 32 facing the mounting plate 4, which is adapted to contact the inner side of the mounting plate 4. This arrangement can limit the inner side surface of the mounting plate 4, thereby facilitating improved stability of the mounting plate 4 within the connecting frame 3. Providing the elastic pad on the abutment portion 32 can reduce wear between the abutment portion 32 and the mounting plate 4.

[0046] In some embodiments, as Figures 1 to 7The outer peripheral wall of the mounting plate 4 contacts the inner peripheral wall of the connecting frame 3, and a limiting groove 33 is provided on the inner bottom wall of the connecting frame 3, which penetrates its thickness in the vertical direction; the fixing structure 7 includes a limiting portion 71 and a second elastic member 72; the limiting portion 71 is plugged into the limiting groove 33 in the vertical direction, and the top of the limiting portion 71 protrudes from the bottom wall of the connecting frame 3; the second elastic member 72 is sleeved on the limiting portion 71, and the two ends of the second elastic member 72 are respectively connected to the limiting portion 71 and the connecting frame 3 to provide the limiting portion 71 with an upward The second elastic member 72 is provided with a downward elastic force. The protruding end of the limiting portion 71 is provided with an inclined surface 711 on the side facing the opening 12 of the connecting frame 3. The inclined surface 711 of the protruding end of the limiting portion 71 faces the top of the connecting frame 3. During the insertion of the mounting plate 4 and the connecting frame 3, the protruding portion 61 of the limiting portion 71 is pressed into the limiting groove 33. After the mounting plate 4 is inserted into place, the limiting groove 33 is located on the outside of the mounting plate 4. Under the elastic force of the second elastic member 72, the limiting portion 71 protrudes out of the limiting groove 33 and contacts the outside of the mounting plate 4. The bottom of the limiting portion 71 protrudes out of the limiting groove 33. The second elastic member 72 includes a spring that is sleeved around the portion of the bottom of the limiting portion 71 that protrudes out of the limiting groove 33. The two ends of the spring are respectively fixed to the limiting portion 71 and the connecting frame 3. The spring can provide an upward and downward elastic force to the limiting portion 71, so that the top of the limiting portion 71 can protrude from the bottom wall of the connecting frame 3.

[0047] For example, during the insertion of the mounting plate 4 and the connecting frame 3, the inner side of the mounting plate 4 first contacts the inclined surface 711 of the limiting portion 71. Then, during the insertion of the mounting plate 4, the mounting plate 4 presses the limiting portion 71 into the limiting groove 33. At this time, the top of the limiting portion 71 contacts the bottom of the mounting plate 4. When the inner side of the mounting plate 4 contacts the abutting portion 32, the mounting plate 4 is exposed from the limiting groove 33. At this time, the top of the limiting portion 71 protrudes from the top of the limiting groove 33 under the elastic force of the second elastic member 72, and the limiting portion 71 contacts the outer side of the mounting plate 4, thereby limiting the position of the mounting plate 4. Through the cooperation of the abutting portion 32 and the limiting portion 71, the mounting plate 4 can be fixed in the connecting frame 3. After the connecting plate is fixed in the connecting frame 3, the position of the protrusion 61 can be kept fixed, thereby facilitating the clamping portion 6 to limit the front-to-back direction of the pipe joint 21.

[0048] In some embodiments, as Figures 1 to 7 A plurality of limiting grooves 33 are provided at intervals along the length of the connecting frame 3, and a plurality of fixing structures 7 are provided, each corresponding to the limiting grooves 33. The portable tester further includes a connecting rod 73, which is arranged horizontally and fixedly connected to the plurality of limiting portions 71. With this arrangement, when the mounting plate 4 needs to be removed, the connecting rod 73 can be pulled downward to cause all the limiting portions 71 to slide downward, thereby releasing the limiting portions 71 from the mounting plate 4, allowing the mounting plate 4 to slide out of the connecting frame 3.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable tester for testing the performance of a single railway freight car, comprising a housing and a gas pipeline, the gas pipeline comprising a plurality of pipe joints, with two adjacent pipe joints being spliced together; the housing having a placement space suitable for accommodating the gas pipeline, and a side of the housing having an opening communicating with the placement space; one end of the gas pipeline being connected to a gas source via a pipeline, and the other end being suitable for communicating with a brake cylinder via a pipeline; characterized in that: The portable tester also includes: a connecting frame, disposed in the shell at a side opposite to the opening, with a fixing cavity formed between the connecting frame and the inner side wall of the shell; A mounting plate adapted to be plugged into and fitted with the connection frame; and A support portion is fixed to a side of the mounting plate facing the opening; the support portion has a first receiving groove extending vertically through its thickness at one end facing the opening, and a sidewall of the support portion has a second receiving groove extending horizontally through its thickness; the first receiving groove is suitable for receiving a pipe joint, and the second receiving groove is suitable for receiving a hexagonal prism to axially limit the pipe joint; There are at least two supporting parts, each of which is used to support the pipe joints at both ends of the gas pipeline; the mounting plate is provided with a connecting groove horizontally on the outer periphery of the supporting part, and the connecting groove is suitable for communicating with the fixing cavity; The portable tester further includes a clamping portion and a fixing structure, wherein one end of the clamping portion is hingedly connected to the connecting groove, and the axis of the hinge is arranged in the vertical direction; the clamping portion is provided with a protrusion at the hinge, and the protrusion is adapted to rotate the clamping portion toward the pipe joint during contact with the side wall of the housing to radially limit the pipe joint; the fixing structure is adapted to immediately fix the position of the mounting plate after the mounting plate slides into place, so that the clamping portion maintains the state of radially limiting the pipe joint; The clamping portion is an arc-shaped structure, and the concave surface is adapted to face the pipe joint; after the mounting plate is installed in place, the end of the clamping portion away from the hinge is adapted to span the first receiving groove; The outer peripheral wall of the mounting plate contacts the inner peripheral wall of the connecting frame, and a limiting groove is provided on the inner bottom wall of the connecting frame extending through the thickness thereof in the vertical direction; the fixing structure includes: a limiting portion, plugging and cooperating with the limiting groove in the up-down direction, with the top of the limiting portion protruding from the bottom wall of the connecting frame; and The second elastic member is sleeved on the limiting portion, and two ends of the second elastic member are respectively connected to the limiting portion and the connecting frame to provide elastic force to the limiting portion in the up and down directions.

2. A portable tester for testing the performance of a single railway freight car according to claim 1, characterized in that: The end of the protrusion facing away from the clamping portion is a bent end, and the outer wall surface of the bent end is suitable for contacting the inner wall surface of the shell; wherein, the outer wall surface of the bent end is provided with a plurality of rollers at intervals along the up and down directions, and the rollers are rotatably matched with the bent end, and the axis is along the up and down directions; the rollers are suitable for contacting the inner wall surface of the shell.

3. A portable tester for testing the performance of a single railway freight car according to claim 1, characterized in that: The clamping portion is provided with a first elastic member at a hinged position, and the two ends of the first elastic member are respectively connected to the clamping portion and the mounting plate; the first elastic member is used to provide torque to the clamping portion so that the clamping portion clamps the pipe joint when the pipe joint is installed with the support portion.

4. A portable tester for testing the performance of a single railway freight car according to claim 1, characterized in that: An abutment portion is fixedly provided on the inner wall of the shell at the position of the fixing cavity, and the abutment portion is suitable for contacting the inner side wall of the mounting plate to limit the mounting plate.

5. A portable tester for testing the performance of a single railway freight car according to claim 4, characterized in that: An elastic pad is connected to one end of the abutting portion facing the mounting plate, and the elastic pad is suitable for contacting the inner side of the mounting plate.

6. A portable tester for testing the performance of a single railway freight car according to claim 1, characterized in that: The protruding end of the limiting portion is provided with a sloped surface on the side facing the opening of the connecting frame, and the sloped surface of the protruding end of the limiting portion faces the top of the connecting frame; during the plug-in connection between the mounting plate and the connecting frame, the protruding portion of the limiting portion is pressed into the limiting groove; after the mounting plate is plugged into place, the limiting groove is located on the outside of the mounting plate, and the limiting portion protrudes out of the limiting groove under the elastic force of the second elastic member and contacts the outside of the mounting plate.

7. A portable tester for testing the performance of a single railway freight car according to claim 6, characterized in that: The limiting grooves are provided at intervals along the length direction of the connecting frame, and the fixing structures are multiple and correspond one to one with the limiting grooves; Wherein, the portable tester further includes a connecting rod, which is horizontally arranged and connected to the plurality of limiting parts.

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