Track circuit shunt residual voltage tester

Abstract

The utility model relates to rail transit signal equipment test technical field discloses a track circuit branch residual voltage tester, including steel rail clamp, test host computer and short -circuit simulation subassembly, steel rail clamp is provided with two groups, two groups of steel rail clamp respectively to the rail head of two tracks are clamped, and exert the simulation load, and the test host computer is provided with the branch resistance interface group of corresponding different track circuit system, and two steel rail clamps are electrically connected with the test host computer through short -circuit simulation subassembly, the utility model can switch branch resistance according to JZXC -480, 25HZ, UM71, ZPW -2000 etc. different track circuit system flexibly, and can fast detection voltage value and residual voltage value after the branch of track circuit branch, adapt to the diversification test scene.

Description

Technical Field

[0001] This utility model relates to the field of testing technology for rail transit signaling equipment, specifically a track circuit shunt residual voltage tester. Background Technology

[0002] Track circuits are signaling systems that use two steel rails as transmission lines. Their main function is to check whether a track section is occupied. When a train enters the section, the contact between the train's wheels and the two rails short-circuits the signal transmission circuit, causing the energized relay to drop, indicating that the section is occupied. When the train leaves the section, the energized relay is energized and activates, indicating that the section is free. The accuracy of track circuit occupancy and shunting safety is directly related to the safety of train operation and shunting; therefore, the electrical department must regularly inspect and test this status.

[0003] However, track circuits often experience shunt failures, and to solve such problems, specialized simulation testing tools must be used.

[0004] Chinese utility model patent CN212622781U discloses a portable track circuit shunt residual voltage tester, which includes two sets of constant pressure shunt fixtures, a data display device, and a standard shunt resistance wire. A pressure sensor is installed in each constant pressure shunt fixture. One end of the standard shunt resistance wire is detachably connected to one set of constant pressure shunt fixtures, and the other end is detachably connected to the other set. Two sets of data display devices are provided, one set fixedly mounted on one set of constant pressure shunt fixtures, and each data display device is connected to a pressure sensor on its corresponding constant pressure shunt fixture. By integrating one set of data display devices and one set of constant pressure shunt fixtures into a single structural component, the entire tester has only three structural components, reducing the number of components, simplifying the structure, and making it easier to carry and use.

[0005] The above-mentioned device has the following shortcomings in actual use:

[0006] Different track circuit types (such as JZXC-480, 25HZ, UM71, ZPW-2000 series, etc.) correspond to different standard shunt resistors (such as 0.06Ω, 0.15Ω, 0.25Ω). The above device does not have a shunt resistor selection mechanism that can match different track circuit types, and cannot flexibly switch shunt resistors according to actual test requirements.

[0007] Therefore, a track circuit shunt residual voltage tester is proposed. Utility Model Content

[0008] The purpose of this invention is to provide a track circuit shunt residual voltage tester, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a track circuit shunt residual voltage tester, comprising:

[0010] The rail clamps are provided in two sets, which clamp the rail heads of the two rails respectively and apply simulated loads.

[0011] The test host is equipped with shunt resistor interface groups corresponding to different track circuit systems.

[0012] A short-circuit simulation component is provided, through which the two rail clamps are electrically connected to the test host.

[0013] In a track circuit shunt residual voltage tester according to the present invention, optionally, the shunt resistor interface group includes a first shunt resistor interface, a second shunt resistor interface and a third shunt resistor interface, wherein the first shunt resistor interface is electrically connected to one end of a resistor with a resistance of 0.06Ω, the second shunt resistor interface is electrically connected to one end of a resistor with a resistance of 0.15Ω, and the third shunt resistor interface is electrically connected to one end of a resistor with a resistance of 0.25Ω.

[0014] In a track circuit shunt residual voltage tester according to the present invention, optionally, the test host is provided with a COM interface, and the other ends of the 0.06Ω resistor, the 0.15Ω resistor, and the 0.25Ω resistor are all electrically connected to the COM interface.

[0015] In a track circuit shunt residual voltage tester according to the present invention, optionally, a detection circuit board is provided inside the test host, and a first probe interface and a second probe interface are provided on the test host, the first probe interface and the second probe interface being electrically connected to the detection circuit board.

[0016] Optionally, the track circuit shunt residual voltage tester according to the present invention further includes a first test probe and a second test probe. The tail end of the wire of the first test probe is electrically connected to the first probe interface of the test host, and the tail end of the wire of the second test probe is electrically connected to the second probe interface of the test host. The tip of the first test probe contacts one of the rail treads, and the tip of the second test probe contacts the other rail tread.

[0017] In a track circuit shunt residual voltage tester according to the present invention, optionally, the test host is equipped with a range adjustment knob for adjusting the measurement range, and the range adjustment knob is electrically connected to the detection circuit board.

[0018] In a track circuit shunt residual voltage tester according to the present invention, optionally, a second display screen is embedded on the test host, and the second display screen is electrically connected to the test circuit board.

[0019] In a track circuit shunt residual voltage tester according to the present invention, optionally, a rechargeable battery is installed inside the test host, and a power switch is installed on the test host.

[0020] In a track circuit shunt residual voltage tester according to the present invention, optionally, the short-circuit simulation component includes a first shunt wire and a second shunt wire. One end of the first shunt wire is electrically connected to the COM interface in the test host, and the other end of the first shunt wire is electrically connected to one of the rail clamps. One end of the second shunt wire is electrically connected to the shunt resistor interface group in the test host, and the other end of the second shunt wire is electrically connected to another rail clamp.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] It can flexibly switch the shunt resistor according to different track circuit systems such as JZXC-480, 25HZ, UM71, and ZPW-2000, and can quickly detect the voltage value before shunting and the residual voltage value after shunting, adapting to diverse testing scenarios. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head according to the present invention;

[0024] Figure 2 This is a schematic diagram of the rail clamp in a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head according to the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the left gripper in the track circuit constant pressure shunt residual pressure test system with a laterally adjustable piezoelectric head according to the present invention when the left gripper is open;

[0026] Figure 4 This is a schematic diagram of the left gripper in a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head.

[0027] Figure 5 A partial structural diagram of a rail clamp in a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head;

[0028] Figure 6A schematic cross-sectional view of a rail clamp for a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head.

[0029] Figure 7 for Figure 6 A magnified structural diagram of part A in the diagram;

[0030] Figure 8 This is a schematic diagram of the crossbeam structure in a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head according to the present invention.

[0031] Figure 9 This is a schematic diagram of the piezoelectric mechanism in a track circuit constant pressure shunt residual pressure testing system with a laterally adjustable piezoelectric head according to the present invention.

[0032] Figure 10 This is an exploded structural diagram of the piezoelectric mechanism in a lightweight aviation aluminum alloy track circuit test fixture of this utility model.

[0033] Figure 11 This is a schematic diagram of the test host structure in a track circuit constant pressure shunt residual pressure test system with a laterally adjustable piezoelectric head according to this utility model.

[0034] In the diagram: 100, rail clamp;

[0035] 101. Crossbeam; 1011. Mounting base; 1012. First pin hole; 1013. Second pin hole; 1014. Positioning pin hole; 1015. Slide groove; 1016. Through hole; 1017. Mounting groove;

[0036] 102. Right gripper; 1021. Positioning hole; 1022. First pin;

[0037] 103. Left gripper; 1031. First hinge hole; 1032. Second positioning hole; 1033. Second pin; 1034. Positioning pin;

[0038] 104. Force-adding mechanism;

[0039] 1041, First screw; 10411, Handle;

[0040] 1042. Second screw; 10421. Handwheel;

[0041] 1043, Housing; 10431, First Inner Cavity; 10432, Second Inner Cavity; 10433, Bearing Groove; 10434, Ball Bearing; 10435, Guide Rod; 10436, Limiting Bolt;

[0042] 1044, First piston; 1045, Second piston; 1046, Piston rod; 1047, Insulating plate; 1048, First slider;

[0043] 105. Pressure sensor;

[0044] 106. Piezoelectric mechanism; 1061. Assembly base; 10611. Arc-shaped limiting groove; 10612. Arc-shaped waist hole; 1062. Piezoelectric head; 10621. Second slider; 10622. Threaded hole; 1063. Handle bolt;

[0045] 107. First display screen; 108. Circuit board; 109. Rechargeable battery; 110. Support block;

[0046] 200. Test host; 201. COM interface; 202. First shunt resistor interface; 203. Second shunt resistor interface; 204. Third shunt resistor interface; 205. Second display screen; 206. Gear adjustment knob; 207. Power switch; 208. First probe interface; 209. Second probe interface;

[0047] 300. First branch conductor;

[0048] 400. Second branch conductor;

[0049] 500, First test probe;

[0050] 600, Second test pen. Detailed Implementation

[0051] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0053] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0054] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] Example 1

[0056] Please see Figures 1 to 11 This utility model provides a technical solution:

[0057] A track circuit shunt residual voltage tester, characterized in that it comprises:

[0058] The rail clamp 100 is provided in two sets. The two sets of rail clamps 100 clamp the rail heads of the two rails respectively and apply simulated load.

[0059] Test host 200, the test host 200 is equipped with shunt resistor interface groups corresponding to different track circuit systems;

[0060] The short-circuit simulation component connects two rail clamps 100 to the test host 200.

[0061] Two sets of rail clamps 100 clamp the rail heads of two rails respectively, applying pressure to the rail heads to simulate the shunt state when a train is in operation. The test host 200 is electrically connected to the rail clamps 100 through a short-circuit simulation component, forming a closed loop. The shunt resistor interface group is used to connect standard shunt resistors. After the rail clamps 100 clamp the rail heads, the test host 200 injects current into the rails through the short-circuit simulation component to simulate the process of a train wheelset short-circuiting the rail circuit, thereby testing the shunt residual voltage of the rail circuit.

[0062] In this embodiment, the shunt resistor interface group includes a first shunt resistor interface 202, a second shunt resistor interface 203, and a third shunt resistor interface 204. The first shunt resistor interface 202 is electrically connected to one end of a resistor with a resistance of 0.06Ω, the second shunt resistor interface 203 is electrically connected to one end of a resistor with a resistance of 0.15Ω, and the third shunt resistor interface 204 is electrically connected to one end of a resistor with a resistance of 0.25Ω.

[0063] The shunt resistor interface group provides three standard shunt resistors: 0.06Ω, 0.15Ω, and 0.25Ω, which correspond to the test requirements of different track circuit systems or shunt states.

[0064] In this embodiment, the test host 200 is provided with a COM interface 201, and the other ends of the resistors with a resistance of 0.06Ω, 0.15Ω, and 0.25Ω are all electrically connected to the COM interface 201.

[0065] COM interface 201 serves as the common terminal for the shunt resistors, connecting the other ends of the three shunt resistors to form a unified grounding loop. When the test host 200 connects a resistor of a certain value through the shunt resistor interface group, one end of the resistor is connected to the corresponding interface, and the other end is connected to the common ground of the test host 200 through COM interface 201. This design simplifies the circuit structure, ensures that different shunt resistors share the same grounding path when switching, and avoids test errors caused by grounding differences.

[0066] In this embodiment, the test host 200 is internally equipped with a detection circuit board. The test host 200 is equipped with a first probe interface 208 and a second probe interface 209, which are electrically connected to the detection circuit board. It also includes a first test probe 500 and a second test probe 600. The tail end of the wire of the first test probe 500 is electrically connected to the first probe interface 208 of the test host 200, and the tail end of the wire of the second test probe 600 is electrically connected to the second probe interface 209 of the test host 200. The tip of the first test probe 500 contacts one of the rail treads, and the tip of the second test probe 600 contacts the other rail tread.

[0067] The detection circuit board processes the voltage signals collected by the probes. The first probe interface 208 and the second probe interface 209 are connected to the first test probe 500 and the second test probe 600, respectively. After the probes contact the rail tread, they transmit the rail surface residual pressure signal to the detection circuit board. The detection circuit board calculates the residual pressure value.

[0068] In this embodiment, the test host 200 is equipped with a range adjustment knob 206 for adjusting the measurement range, and the range adjustment knob 206 is electrically connected to the detection circuit board.

[0069] The range adjustment knob 206 is used to switch the measurement range of the detection circuit board between 200mV, 2V, and 20V to adapt to different rail surface residual pressure amplitude ranges. For example, when the rail surface residual pressure is low, such as 0.5V, a low range setting is selected to improve measurement accuracy; when the residual pressure is high, such as 10V, switching to a high range setting avoids signal overload, ensuring the accuracy and stability of the measurement results.

[0070] The detection circuit board in this embodiment uses a commercially available digital display multimeter circuit board.

[0071] In this embodiment, a second display screen 205 is embedded on the test host 200, and the second display screen 205 is electrically connected to the test circuit board.

[0072] The second display screen 205 can display the residual voltage value and shunt resistor level information after the detection circuit board has been processed in real time.

[0073] In this embodiment, a rechargeable battery is installed inside the test host 200, and a power switch 207 is installed on the test host 200.

[0074] The rechargeable battery provides an independent power supply for the test host 200, ensuring normal operation in railway field environments without external power. The power switch 207 controls the on / off power supply to the battery. The battery typically uses high-energy-density lithium batteries, supporting continuous testing operations for several hours, and has overcharge protection to extend battery life.

[0075] In this embodiment, the short-circuit simulation component includes a first shunt wire 300 and a second shunt wire 400. One end of the first shunt wire 300 is electrically connected to the COM interface 201 in the test host 200, and the other end of the first shunt wire 300 is electrically connected to one of the rail clamps 100. One end of the second shunt wire 400 is electrically connected to the shunt resistor interface group in the test host 200, and the other end of the second shunt wire 400 is electrically connected to another rail clamp 100.

[0076] The first branch conductor 300 and the second branch conductor 400 form a closed loop: the first branch conductor 300 connects the COM interface 201 of the test host 200 to one of the rail clamps 100, and the second branch conductor 400 connects the branch resistor interface group to the other rail clamp 100. When the test host 200 selects a certain branch resistor, the current flows out from the interface of that branch resistor, through the second branch conductor 400 to the rail clamp 100, and returns to the test host 200 through the rail head, the other rail clamp 100, and the first branch conductor 300, forming a complete branch current path to simulate the process of a train wheelset short-circuiting the track circuit.

[0077] In this embodiment, both sets of rail clamps 100 include a clamping mechanism, a force-applying mechanism 104 is installed on the clamping mechanism, a force-measuring mechanism is installed at the bottom of the force-applying mechanism 104, and a piezoelectric mechanism 106 is installed at the bottom of the measuring end of the force-measuring mechanism.

[0078] The clamping mechanism includes a crossbeam 101, a right jaw 102 and a left jaw 103, with the right jaw 102 and the left jaw 103 respectively installed at both ends of the crossbeam 101;

[0079] The force multiplier mechanism 104 includes a first screw 1041, a second screw 1042, a pressure multiplier, and a first slider 1048. A groove 1015 is provided at one end of the crossbeam 101, and the first slider 1048 is slidably installed within the groove 1015. A through hole 1016 extending from top to bottom through the groove 1015 is provided on the crossbeam 101. The first screw 1041, through the first slider 1048, extends between the right gripper 102 and the left gripper 103 after being threaded through the first slider 1048. The pressure multiplier includes a housing 1043. The upper part of the housing 1043 has a first inner cavity 10431, and the lower part of the housing 1043 has a second inner cavity 10432. The cross-sectional area of ​​the second inner cavity 10432 is smaller than that of the first inner cavity 10431. The bottom of the first inner cavity 10431 is connected to the top of the second inner cavity 10432. The first piston 1044 is installed inside the first inner cavity 10431. The lower end of the second screw 1042 is threaded through the top of the housing 1043 and is rotatably connected to the first piston 1044.

[0080] A second piston 1045 is installed inside the second inner cavity 10432. A piston rod 1046 is fixedly connected to the bottom of the second piston 1045. The bottom of the piston rod 1046 slides through the bottom of the housing 1043.

[0081] The lower end of the first screw 1041 is rotatably connected to the upper end of the housing 1043.

[0082] By adopting the above technical solution, during use, rotating the first screw 1041 causes the first screw 1041 to rotate through the first slider 1048, and the first slider 1048 slides within the groove 1015. Therefore, the rotation of the first screw 1041 will drive the pressure multiplier to move up and down on the crossbeam 101, thereby adjusting the relative position of the piezoelectric mechanism 106 and the rail. When pressure needs to be applied to the rail, first rotating the first screw 1041 will drive the pressure multiplier and the piezoelectric mechanism 106 to move downward, so that the piezoelectric mechanism 106 presses against the tread surface. At this time, the pressure is 2-5 kN. Then, rotating the second screw 1042 will drive the first piston 1044 to move downward within the first inner cavity 10431, and the liquid (usually hydraulic oil) in the first inner cavity 10431 will be squeezed into the second inner cavity 10432. Because the cross-sectional area of ​​the second inner cavity 10432 is smaller than that of the first inner cavity 10431, according to Pascal's law, the pressure is equal everywhere in a closed liquid system. Therefore, a greater pressure will be generated in the second inner cavity 10432, which will push the second piston 1045 to move downward. Then, the pressure will be transmitted to the force measuring mechanism and the piezoelectric mechanism 106 below through the piston rod 1046, and finally act on the tread of the rail.

[0083] In this embodiment, mounting bases 1011 are fixedly connected to the bottom of both ends of the crossbeam 101. One mounting base 1011 has multiple first pin holes 1012. The upper end of the right gripper 102 has a positioning insertion hole 1021 corresponding to the first pin holes 1012. The right gripper 102 is fixed to one end of the crossbeam 101 by a first pin 1022. The other mounting base 1011 has a second pin hole 1013. The upper end of the left gripper 103 has a first hinge hole 1031. The left gripper 103 is hinged to the other end of the crossbeam 101 by a second pin 1033. The top of the end of the crossbeam 101 near the second pin hole 1013 has a positioning pin hole 1014. The top of the left gripper 103 has a second positioning hole 1032. The lower end of the positioning pin 1034 passes through the positioning pin hole 1014 and can be inserted into the second positioning hole 1032.

[0084] Through the above technical solution, the right gripper 102 is fixed to the mounting base 1011 of the crossbeam 101 by multiple first pins 1022, and the left gripper 103 is hinged to the crossbeam 101 by second pins 1033, and can swing outward to fit the rail head; during installation, after the left gripper 103 is lowered, the positioning pin 1034 passes through the positioning pin hole 1014 and is inserted into the second positioning hole 1032, locking the left gripper 103 in a vertical position, which cooperates with the right gripper 102 to form a stable clamping structure, firmly clamping the rail head, and avoiding the clamp from loosening during the test, which would affect the pressure accuracy and contact effect.

[0085] In this embodiment, the first screw 1041 is tubular, and the second screw 1042 is slidably inserted into the inside of the first screw 1041.

[0086] By adopting the above technical solution, this design makes the first screw 1041 and the second screw 1042 more compact in spatial arrangement. When rotating the first screw 1041 to adjust the position of the pressure multiplier, the second screw 1042 can slide inside the first screw 1041 without affecting the normal rotation and position adjustment of the first screw 1041. At the same time, when rotating the second screw 1042 to apply pressure, because the second screw 1042 is relatively independent yet nested with the first screw 1041, it will not be obstructed by the position of the first screw 1041, ensuring the smooth operation of the force application.

[0087] In this embodiment, a bearing groove 10433 is provided on the top of the housing 1043, and the lower end of the first screw 1041 is rotatably mounted in the bearing groove 10433 through a ball bearing 10434.

[0088] In this embodiment, the force measuring mechanism includes a pressure sensor 105, a first display screen 107, and a circuit board 108. An insulating plate 1047 is fixedly connected to the bottom of the piston rod 1046. The pressure sensor 105 is fixed to the bottom of the insulating plate 1047. A mounting groove 1017 is provided at the end of the rail clamp 100 away from the left jaw 103. The circuit board 108 is fixed in the mounting groove 1017. The pressure sensor 105 is electrically connected to the circuit board 108 through a communication wire. The first display screen 107 is fixedly embedded in one side of the crossbeam 101. The first display screen 107 is electrically connected to the circuit board 108. A rechargeable battery 109 is installed in the mounting groove 1017. The rechargeable battery 109 is electrically connected to the circuit board 108.

[0089] By adopting the above technical solution, when the piston rod 1046 is subjected to pressure and transmitted downwards, the pressure sensor 105 senses this pressure signal and converts it into an electrical signal. This electrical signal is transmitted to the circuit board 108 via a communication wire. After processing and converting the signal, the circuit board 108 transmits the pressure data to the first display screen 107 for display. The operator can intuitively read the current pressure value applied to the rail from the first display screen 107. The insulating plate 1047 prevents the pressure sensor 105 from being subjected to possible external electrical interference, ensuring the accuracy of the measurement. The rechargeable battery 109 powers the entire force measuring mechanism's circuit system, allowing the test fixture to operate normally without an external power source, improving its ease of use and flexibility.

[0090] In this embodiment, the rechargeable battery 109 is a lithium battery.

[0091] In this embodiment, the piezoelectric mechanism 106 includes a mounting base 1061 and a piezoelectric head 1062. The mounting base 1061 is fixed to the bottom of the pressure sensor 105. An arc-shaped limiting groove 10611 is formed on the lower surface of the mounting base 1061. A second slider 10621 is fixedly connected to the top of the piezoelectric head 1062. The second slider 10621 is slidably installed in the arc-shaped limiting groove 10611.

[0092] By adopting the above technical solution, the mounting base 1061 is fixed to the bottom of the pressure sensor 105, and the arc-shaped limiting groove 10611 on its lower surface provides a track for the lateral adjustment of the piezoelectric head 1062; the piezoelectric head 1062 slides in the arc-shaped limiting groove 10611 through the second slider 10621 on the top, which can realize angle adjustment, so that the piezoelectric head 1062 can be pressed vertically on the tread surface; during adjustment, the center of the piezoelectric head 1062 is aligned with the center line of the rail head tread wear mark zone, ensuring good contact between the lower surface of the piezoelectric head 1062 and the rail surface, truly simulating the contact state between the train wheelset and the rail, avoiding test errors caused by contact position deviation, and meeting the requirement of "testing all rail tread wear mark positions".

[0093] In this embodiment, an arc-shaped waist hole 10612 communicating with an arc-shaped limiting groove 10611 is provided on one side of the mounting base 1061, and a threaded hole 10622 is provided on the second slider 10621. The screw of the handle bolt 1063 passes through the arc-shaped waist hole 10612 and is threaded into the threaded hole 10622.

[0094] When adjusting the position of the piezoelectric head 1062, the handle bolt 1063 can be loosened. At this time, the second slider 10621 can slide freely within the arc-shaped limiting groove 10611, facilitating the adjustment of the piezoelectric head 1062 to a suitable position to meet different testing requirements. After the position is adjusted, the handle bolt 1063 is tightened. The screw of the handle bolt 1063 is threaded into the threaded hole 10622 on the second slider 10621, fixing the second slider 10621 in its current position, thus initially securing the piezoelectric head 1062.

[0095] In this embodiment, a handle 10411 is fixedly sleeved on the upper end of the first screw 1041, and a handwheel 10421 is fixedly connected to the top of the second screw 1042.

[0096] By adopting the above technical solution, the handle 10411 is designed to facilitate the operator to rotate the first screw 1041, and the handwheel 10421 is also designed to facilitate the operator to rotate the second screw 1042. The larger diameter of the handwheel 10421 can provide a larger lever arm, making it easier for the operator to apply pressure when rotating the second screw 1042, thereby improving the convenience and efficiency of operation.

[0097] In this embodiment, a guide rod 10435 is fixedly connected to the top of the housing 1043, and a guide hole is provided on the first slider 1048. The upper end of the guide rod 10435 is slidably inserted into the guide hole.

[0098] By adopting the above technical solution, when the first screw 1041 is rotated, causing the housing 1043 to move up and down on the crossbeam 101, the guide rod 10435 slides within the guide hole of the first slider 1048. The guide rod 10435 plays a guiding role, ensuring that the pressure multiplier maintains linear motion during movement, avoiding deviation or wobbling, making the position adjustment of the pressure multiplier more accurate, thereby improving the stability and reliability of the entire test fixture.

[0099] In this embodiment, the lower ends of the right gripper 102 and the left gripper 103 are both fixedly connected to a bearing block 110, and the top of the bearing block 110 can abut against the lower side of the rail head.

[0100] By adopting the above technical solution, when clamping the rail, the right jaw 102 and the left jaw 103 contact the underside of the rail head via the bearing block 110. The bearing block 110 is typically made of a material with high hardness, and its function is to increase the contact strength between the jaws and the rail, preventing the jaws from being damaged due to excessive force during clamping. At the same time, the bearing block 110 can more evenly transmit the clamping force of the jaws to the rail, improving the stability of clamping and ensuring that the rail remains stable when the test fixture applies pressure and performs tests, thus guaranteeing the accuracy of the test results.

[0101] In this embodiment, a limiting bolt 10436 is threaded onto the top of the housing 1043. This design reduces the upward movement distance of the housing 1043. It should be noted that the limiting bolt 10436 must be removed when inspecting a 75kg / m rail.

[0102] In this embodiment, one end of the first branch wire 300 is electrically connected to the COM interface 201 in the test host 200, and the other end of the first branch wire 300 is electrically connected to the piezoelectric head 1062 in one of the rail clamps 100. One end of the second branch wire 400 is electrically connected to the branch resistor interface group in the test host 200, and the other end of the second branch wire 400 is electrically connected to the piezoelectric head 1062 on another rail clamp 100.

[0103] Through the above technical solution, the short-circuit simulation component connects the piezoelectric heads 1062 of the two rail clamps 100 to the test host 200 via the first shunt wire 300 and the second shunt wire 400, forming a short-circuit loop across the two rails, simulating the state of a train wheelset contacting the two rails and causing a short circuit in the track circuit. The shunt resistor interface group of the test host 200 is preset with different standard resistors of 0.06Ω, 0.15Ω, and 0.25Ω. The corresponding interface can be selected according to the track circuit type, such as 0.06Ω for JZXC-480, 0.15Ω for ZPW-2000 series, and 0.25Ω for high-speed rail type, to ensure that the short-circuit state is consistent with the resistance characteristics of the actual train wheelset. The COM interface 201 serves as a common terminal, forming a complete loop with the shunt resistor interface, enabling the test host 200 to accurately measure the residual voltage value after shunting, meeting the test standards of different track circuit types.

[0104] It is worth noting that the test host 200 in this embodiment can be selected from the following models:

[0105] CFG-D2 Track Circuit Residual Pressure Constant Pressure Tester: This model of tester can meet the requirements for testing parameters such as residual pressure of track circuits composed of rails of various grades including 43Kg / m, 50Kg / m, 60Kg / m, and 75Kg / m. It can generate 24.5KN (equivalent to 2.5 tons) of pressure, simulating the state of a pair of wheelsets of a light rail vehicle pressing on the rail. It consists of two constant pressure shunt clamps, testing instruments, and standard shunt resistance wires. The load force test error is no more than 5%, and the instrument test values ​​are stable and reliable.

[0106] The TAFL-Ⅲ type track circuit shunt residual pressure constant voltage tester features an adjustable loading and translation mechanism, allowing for flexible loading at different positions on the rail surface to simulate the shunt state of wheelsets at different rolling positions on the rail. It is suitable for both high-speed and conventional railways. It also has online testing functions for shunt current and voltage.

[0107] When using it, the specific steps are as follows:

[0108] S1. Confirm that there are no cars on the track and that the track circuit is powered. Based on the track circuit system and residual voltage standard used in the station area, select the voltage range using the range adjustment knob of the test host 200.

[0109] S2. Insert the end of the wire of the first test probe 500 into the first probe interface 208 of the test host 200, and insert the end of the wire of the second test probe 600 into the second probe interface 209 of the test host 200.

[0110] S3. Twist the first screw 1041 and the second screw 1042 on the rail clamp 100 in the opposite direction so that they are both in the uppermost position; lift the positioning pin 1034 of the left jaw 103, pry open the left jaw 103, put a set of rail clamps 100 on the rail head of one of the rails, lower the left jaw 103 so that the positioning pin 1034 is inserted into the second positioning hole 1032 to lock the left jaw 103.

[0111] S4. Slide the first slider 1048 so that the piezoelectric head 1062 is directly above the tread surface. Turn the first screw 1041 in the forward direction so that the piezoelectric head 1062 just contacts the rail head tread surface. Adjust the angle of the piezoelectric head 1062 along the arc-shaped limiting groove 10611 by the second slider 10621 so that the center of the piezoelectric head 1062 is aligned with the center line of the wear track on the rail head tread surface.

[0112] S5. Turn the first screw 1041 forward to press the piezoelectric head 1062 onto the tread surface until the first display screen 107 shows a preload of 2-5 kN; then turn the second screw 1042 forward to raise the pressure value displayed on the first display screen 107 to 24.5 kN. If the pressure value drops during the test, continue to turn the second screw 1042 to maintain the pressure.

[0113] S6. Repeat steps S3-S5 to install another set of rail clamps 100 on another rail and apply pressure to 24.5kN;

[0114] S7. The tips of the first test probe 500 and the second test probe 600 are respectively brought into contact with the tread surfaces of the two steel rails, and the second display screen 205 of the test host 200 displays the voltage value before the branch circuit.

[0115] S8. Connect one end of the first branch wire 300 to one of the piezoelectric heads 1062 and insert the other end into the COM interface 201 of the test host 200; according to the track circuit system, connect one end of the second branch wire 400 to another piezoelectric head 1062 and insert the other end into the corresponding branch resistor interface.

[0116] S9. Turn on the power switch 207 of the test host 200, and contact the tips of the first test probe 500 and the second test probe 600 with their corresponding rail treads. The second display screen 205 of the test host 200 displays the residual pressure value after the circuit is split.

[0117] S10. After the test is completed, turn the second screw 1042 in the opposite direction to reduce the pressure of the piezoelectric head 1062 to zero; turn the first screw 1041 in the opposite direction to disengage the piezoelectric head 1062 from the rail surface; lift the positioning pin 1034, pry open the left jaw 103, and remove the two sets of rail clamps 100.

[0118] S11. Turn off the test host 200 and disconnect the branch wires and test probes.

[0119] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A track circuit shunt residual voltage tester, characterized in that, include: The rail clamp (100) is provided in two sets, and the two sets of rail clamps (100) clamp the rail heads of the two rails respectively and apply simulated load; Test host (200), the test host (200) is provided with shunt resistor interface groups corresponding to different track circuit systems; The short-circuit simulation assembly connects the two rail clamps (100) to the test host (200).

2. The track circuit shunt residual voltage tester according to claim 1, characterized in that: The shunt resistor interface group includes a first shunt resistor interface (202), a second shunt resistor interface (203), and a third shunt resistor interface (204). The first shunt resistor interface (202) is electrically connected to one end of a resistor with a resistance of 0.06Ω, the second shunt resistor interface (203) is electrically connected to one end of a resistor with a resistance of 0.15Ω, and the third shunt resistor interface (204) is electrically connected to one end of a resistor with a resistance of 0.25Ω.

3. The track circuit shunt residual voltage tester according to claim 2, characterized in that: The test host (200) is provided with a COM interface (201), and the other ends of the resistor with a resistance of 0.06Ω, the other ends of the resistor with a resistance of 0.15Ω, and the other ends of the resistor with a resistance of 0.25Ω are all electrically connected to the COM interface (201).

4. The track circuit shunt residual voltage tester according to claim 3, characterized in that: The test host (200) is equipped with a test circuit board inside. The test host (200) is equipped with a first probe interface (208) and a second probe interface (209). The first probe interface (208) and the second probe interface (209) are electrically connected to the test circuit board.

5. A track circuit shunt residual voltage tester according to claim 4, characterized in that: It also includes a first test probe (500) and a second test probe (600). The end of the lead wire of the first test probe (500) is electrically connected to the first probe interface (208) of the test host (200), and the end of the lead wire of the second test probe (600) is electrically connected to the second probe interface (209) of the test host (200). The tip of the first test probe (500) contacts one of the rail treads, and the tip of the second test probe (600) contacts the other rail tread.

6. The track circuit shunt residual voltage tester according to claim 5, characterized in that: The test host (200) is equipped with a range adjustment knob (206) for adjusting the measurement range, and the range adjustment knob (206) is electrically connected to the detection circuit board.

7. A track circuit shunt residual voltage tester according to claim 4, characterized in that: The test host (200) is equipped with a second display screen (205), which is electrically connected to the test circuit board.

8. A track circuit shunt residual voltage tester according to claim 4, characterized in that: The test host (200) is equipped with a rechargeable battery and a power switch (207).

9. A track circuit shunt residual voltage tester according to any one of claims 1-8, characterized in that: The short-circuit simulation component includes a first shunt wire (300) and a second shunt wire (400). One end of the first shunt wire (300) is electrically connected to the COM interface (201) in the test host (200), and the other end of the first shunt wire (300) is electrically connected to one of the rail clamps (100). One end of the second shunt wire (400) is electrically connected to the shunt resistor interface group in the test host (200), and the other end of the second shunt wire (400) is electrically connected to the other rail clamp (100).

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