A method for testing the contact resistance of the whole machine of a simulated railway signal relay

Abstract

The present invention relates to a method for testing the contact resistance of a relay, in particular a method for testing the contact resistance of a whole railway signal relay. It can simulate the contact pressure and contact current of the whole machine without assembling and debugging the whole relay to test the contact resistance according to the four-wire system. Problematic contacts can be discovered in advance through this testing method, shifting the risk problem of the relay contact resistance forward, avoiding waste of the working hours for disassembling and assembling a batch of whole machines and contact units caused by the discovery of unqualified contact resistance after assembly and debugging, thereby greatly saving production costs.

Description

Technical Field

[0001] The present invention relates to a method for testing the contact resistance of a relay, in particular to a method for testing the contact resistance of a whole railway signal relay, which is applicable to the contacts of all types of railway signal relays. This method can realize the testing of the contact resistance of bare contacts by simulating the whole relay. Background Art

[0002] Railway signal relays are an important component unit of railway signal equipment, and the contact unit is the core execution part of the relay. The contact unit includes a moving contact unit and a static contact unit. The moving contact is the contact that moves together with the armature (or vane) of the relay, and the static contact is the contact that the moving contact closes with when the relay coil is energized or de-energized, which is called the static contact. Whether the contact can conduct normally directly affects railway operation safety, and the electrical characteristic that affects the normal conduction of the contact is the contact resistance. The contact resistance value must be within the standard value to ensure the normal conduction of the relay contact.

[0003] Contact resistance refers to the resistance presented at the contact when a specified current passes between the contacts of a relay under a specified pressure. At present, the contact resistance of railway signal relays can only be tested after the whole relay is assembled and debugged. When there are problems with the contacts, such as problems with the contact material or post-treatment, the contact resistance can only be measured after the whole machine is debugged, and then it will be found that there is a problem with the contact resistance. In production, there will be a quality problem, that is, after the batch of relays has been assembled and debugged, when testing the contact resistance of the relay, it is found that the contact resistance of the contact increases, and then it will be found that there are problems with the contact batch material or the contact post-treatment. This brings a lot of trouble to production and inspection. It is necessary to remove the contact part of the relay again, replace it with a new contact and weld or rivet it into the contact unit, and then reassemble it. Railway signal relays are assembled from many parts, and the production process is long, which causes a lot of losses in manpower and material resources to the manufacturing unit. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for testing the contact resistance of a whole railway signal relay, so as to discover the contact quality problems in advance, move forward the quality problem of increased contact resistance, and thus avoid the problem of increased contact resistance being discovered only after batch whole machine assembly and debugging, and avoid the loss of manpower and material resources caused by unnecessary disassembly and reassembly of the relay.

[0005] The technical solution of the present invention is as follows: It relates to a method for testing the contact resistance of a whole railway signal relay, including: a contact input and output interface unit, a low-resistance tester, an equipment operation indicator light, a leveling foot for the testing equipment, an equipment housing, and a contact force application execution unit. The equipment housing is horizontally fixed to the foundation through the leveling foot for the testing equipment. The equipment housing is divided into three layers. Among them, the middle layer is installed with and fixes the contact force application execution unit and the low-resistance tester. The contact input and output interface unit and the equipment operation indicator light are respectively fixed on the upper layer or the lower layer or both the upper and lower layers.

[0006] The contact force application execution unit includes: a static contact clamping assembly, a servo motor, a moving contact clamping assembly, a force measurement mechanism, and a sensor mounting plate. The sensor mounting plate is a frame structure, fixedly connected to the equipment housing at the bottom. The force measurement mechanism is installed inside the frame. The moving contact clamping assembly and the static contact clamping assembly are installed on the left and right of the frame respectively. The servo motor is installed at the top of the static contact clamping assembly. The servo motor is connected to the static contact clamping assembly through a rotating mechanism. The moving contact clamping assembly on the axial side of the static contact clamping assembly rotates, so that the static contact of the static contact clamping assembly and the moving contact of the moving contact clamping assembly are in contact. The sensing unit of the force measurement mechanism is between the static contact and the moving contact. The contact pressure setting value is input through the input and output interface unit. When the reset button of the equipment operation indicator light is pressed, the servo motor drives the static contact clamping assembly to rotate to the position limited by the limit plate, placing the static contact in the static contact clamping assembly in the correct initial state and the moving contact in the correct initial state at the moving contact clamping assembly. When the start button of the equipment indicator light is pressed during operation, the static contact clamping assembly will rotate towards the moving contact clamping assembly until the moving and static contacts are in contact and the contact pressure reaches the pressure setting value. The low-resistance tester measures the contact resistance according to the four-wire method with the specified contact current, and displays the resistance value on the display screen of the contact input and output interface unit.

[0007] The force measurement mechanism includes a pressure middle rotating shaft, a pressure sensor, and a pressure spring. The pressure middle rotating shaft, the pressure sensor, and the pressure spring are fixed on the mounting frame. There are two pressure springs, respectively arranged on both sides of the mounting frame. The pressure sensor is between the two pressure springs. There is a pressure middle rotating shaft at the upper ends of the two pressure springs. The pressure middle rotating shaft moves downward under the force and is acted on by the reverse force of the two pressure springs. The bottom pressing plate of the pressure middle rotating shaft acts on the pressure sensor. When the moving and static contacts are in contact, the pressure middle rotating shaft will transmit the pressure of the pressure spring to the pressure sensor, so that the applied pressure reaches the set pressure value. At this time, the low-resistance tester will measure the contact resistance of the moving and static contacts at this time according to the four-wire method with the set contact current, and display the test result on the display screen of the contact input and output interface unit.

[0008] The described static contact clamping assembly includes: a static contact rotating arm, a static contact clip, a static contact, and a limit plate. A static contact clip extends from the upper part of the static contact rotating arm to one side. The mouth of the static contact clip is the static contact. There is a limit plate at the lower part of the static contact rotating arm. There is a rotating shaft at the upper end of the limit plate and the lower end of the static contact rotating arm. During operation, when the reset button is pressed, the static contact clamping assembly rotates to the position limited by the limit plate through the rotating shaft, opens the static contact clip, and clamps the static contact in the static contact clip. When the equipment start button is pressed, the static contact rotating arm rotates to the position of the moving contact assembly and contacts the moving and static contacts.

[0009] The described static contact clip includes an upper clip and a lower clip. The upper clip and the lower clip are independent structures. The upper clip and the lower clip are clamped on a vertical line. The static contacts are respectively clamped in the vertical position by the upper clip and the lower clip. A constant test current is applied through the upper clip, and the potential difference generated by the current is led to a low-resistance tester for testing through the lower clip.

[0010] The described moving contact clamping assembly includes: a moving contact, a moving contact positioning pin, an upper electrode, a moving contact clip, a moving contact holder, and a lower electrode. The moving contact holder is fixed on the upper surface of the mounting bracket; the moving contact holder is connected to the fixed end at the lower end of the moving contact clip through a rotating shaft. The upper end of the moving contact clip is the movable end, and the upper movable end is a spring clip. Pressing down the upper movable end makes the clip open, and releasing it makes the upper movable end clamp the moving contact tightly. The moving contact is horizontally placed at the opening position of the moving contact clip; there are an upper electrode, a moving contact, and a lower electrode at the mouth of the moving contact clip. The moving contact is positioned on the lower electrode through the moving contact positioning pin. The upper electrode and the lower electrode are respectively electrically connected to the moving contact. A constant test current is applied through the upper electrode, and the potential difference generated by the current is led to a low-resistance tester for testing through the lower electrode; when the reset button of the equipment operation indicator light is pressed, the moving contact clip is opened, the moving contact is placed on the moving contact positioning pin, and when the start button of the equipment operation indicator light is pressed, the static contact assembly will turn to the moving contact clamping assembly, making the static contact contact the moving contact until the required contact pressure is reached, and the contact resistance is measured through the low-resistance tester.

[0011] The described moving contact clip rotates 90 degrees through the rotating shaft, and the horizontal position of the moving contact clip is just in good contact with the static contact.

[0012] The described moving contact holder is fixed on the upper surface of the mounting bracket. The upper surface of the mounting bracket includes a long strip-shaped opening groove. The pressure medium rotating shaft extends vertically upward to the bottom of the moving contact clip, forming a dynamic contact. The up and down movement of the pressure medium rotating shaft can make the static contact contact the moving contact until the required contact pressure is reached.

[0013] The described contact input / output interface unit includes an input keyboard, a reset button, a start button, a reset indicator light, a start indicator light, and a display screen. The input keyboard is used to set the contact current, and then the contact resistance of the moving and static contacts is measured by the four-wire method. The start indicator light conducts when the start button is pressed, and the reset indicator light conducts when the reset button is pressed. If the test result is within the specified value, it is displayed on the display screen.

[0014] The advantages of the present invention are as follows: Currently, the contact resistance test method of railway signal relays can only be measured when the contact pressure and contact current meet the requirements after the relay is assembled and debugged as a whole. However, the present invention can simulate the contact pressure and contact current of the whole machine without using the whole machine to test the contact resistance, discover the problematic contacts in advance, shift the risk of unqualified contact resistance of the relay forward, avoid the waste of batch whole machine disassembly and assembly man-hours and contact units caused by the increase in contact resistance found only after assembly and debugging, and save manpower, material resources and time.

[0015] The present invention will be further described below in conjunction with the accompanying drawings of the embodiments. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of an embodiment for simulating the whole machine test of the contact resistance of a relay in the present invention;

[0017] Figure 2 It is a schematic diagram of the force application execution mechanism 6 for simulating the whole machine test of the contact resistance of a relay;

[0018] Figure 3 It is a schematic diagram of the force application mechanism 10 for simulating the whole machine test of the contact resistance of a relay;

[0019] Figure 4 It is a schematic diagram of the static contact clamping assembly 7 for simulating the whole machine test of the contact resistance of a relay;

[0020] Figure 5 It is a schematic diagram of the moving contact clamping assembly 9 for simulating the whole machine test of the contact resistance of a relay.

[0021] In the figure: 1. Contact input / output interface unit; 2. Low-resistance tester; 3. Equipment operation indicator light; 4. Test equipment leveling feet; 5. Equipment housing; 6. Contact force application execution unit; 7. Static contact clamping assembly; 8. Servo motor; 9. Moving contact clamping assembly; 10. Force application mechanism; 11. Sensor mounting plate; 12. Pressure middle rotating shaft; 13. Pressure sensor; 14. Pressure spring; 15. Static contact rotating arm; 16. Static contact clip; 17. Static contact; 18. Limit plate; 19. Moving contact; 20. Moving contact positioning pin; 21. Upper electrode; 22. Moving contact clip; 23. Moving contact clip body; 24. Lower electrode. Detailed Embodiment

[0022] To further elaborate on the technical means adopted by the invention to achieve the predetermined purpose, the specific implementation manner, structural features, and their effects of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] As Figure 1 shown, the present invention relates to a method for testing the contact resistance of a whole railway signal relay, including: a contact input / output interface unit 1, a low-resistance tester 2, an equipment operation indicator light 3, a leveling foot 4 for the testing equipment, an equipment housing 5, and a contact force execution unit 6. The equipment housing 5 is fixedly connected to the foundation horizontally through the leveling foot 4 for the testing equipment. The equipment housing 5 is divided into three layers. Among them, the middle layer is installed with the contact force execution unit 6 and the low-resistance tester 2. The contact input / output interface unit 1 and the equipment operation indicator light 3 are respectively fixed on the upper layer or the lower layer or both the upper and lower layers.

[0024] Among them, the contact force execution unit 6 is as Figure 2 shown, including: a stationary contact clamping assembly 7, a servo motor 8, a moving contact clamping assembly 9, a force measuring mechanism 10, and a sensor mounting plate 11. The sensor mounting plate 11 is a frame structure, fixedly connected to the equipment housing 5 at the bottom. The force measuring mechanism 10 is installed inside the frame. The moving contact clamping assembly 9 and the stationary contact clamping assembly 7 are installed on the left and right of the frame respectively. The servo motor 8 is installed at the top of the stationary contact clamping assembly 7. The servo motor 8 is connected to the stationary contact clamping assembly 7 through a rotating mechanism. The moving contact clamping assembly 9 on the axial side of the stationary contact clamping assembly 7 rotates, so that the stationary contact of the stationary contact clamping assembly 7 and the moving contact of the moving contact clamping assembly 9 are in contact. The sensing unit of the force measuring mechanism 10 is between the stationary contact and the moving contact. The contact pressure setting value is input through the input / output interface unit 1. When the reset button of the equipment operation indicator light 3 is pressed, the servo motor 8 drives the stationary contact clamping assembly 7 to rotate to the position limited by the limit plate 18, correctly placing the stationary contact 17 in the stationary contact clamping assembly 7 in its initial state and the moving contact 19 correctly in the initial state at the moving contact clamping assembly 9. During operation, when the start button of the equipment operation indicator light 3 is pressed, the stationary contact clamping assembly 7 will rotate towards the moving contact clamping assembly 9 until the stationary and moving contacts are in contact and the contact pressure reaches the pressure setting value. The low-resistance tester 2 measures the contact resistance based on the four-wire method principle through the specified current of the contact, and displays the resistance value on the display screen of the contact input / output interface unit 1.

[0025] As Figure 3As shown in the figure, a schematic diagram of the force measuring mechanism 10 is given. The force measuring mechanism 10 includes a pressure intermediate rotating shaft 12, a pressure sensor 13, and a pressure spring 14. The pressure intermediate rotating shaft 12, the pressure sensor 13, and the pressure spring 14 are fixed on the mounting bracket. There are two pressure springs 14, which are respectively arranged on both sides of the mounting bracket. The pressure sensor 13 is located between the two pressure springs 14. The upper ends of the two pressure springs 14 are provided with the pressure intermediate rotating shaft 12. When the pressure intermediate rotating shaft 12 is stressed and moves downward, under the action of the reverse force of the two pressure springs 14, the bottom pressing plate of the pressure intermediate rotating shaft 12 acts on the pressure sensor 13. When the moving and static contacts come into contact, the pressure intermediate rotating shaft 12 will transmit the pressure of the pressure spring 14 to the pressure sensor 13, so that the pressure after the moving and static contacts come into contact reaches the set pressure. At this time, the low-resistance tester 2 will measure the contact resistance of the moving and static contacts at this time by the four-wire method through the set contact current, and display the test result on the display screen of the contact input / output interface unit 1.

[0026] The static contact clamping assembly 7 is as Figure 4 shown, and includes: a static contact rotating arm 15, a static contact clip 16, a static contact 17, and a limit plate 18. A static contact clip 16 extends to one side at the upper part of the static contact rotating arm 15. The mouth of the static contact clip 16 is the static contact 17. A limit plate 18 is provided at the lower part of the static contact rotating arm 15. There are rotating shafts at the upper end of the limit plate 18 and the lower end of the static contact rotating arm 15. During operation, when the reset button of the device operation indicator light 3 is pressed, the static contact clamping assembly 7 rotates to the position limited by the limit plate 18 through the rotating shaft, opens the static contact clip 16, and clamps the static contact 17 in the static contact clip 16. When the start button of the device operation indicator light 3 is pressed, the static contact rotating arm 15 rotates to the position of the moving contact clamping assembly 9 and comes into contact with the moving and static contacts.

[0027] The static contact clip 16 includes an upper clip and a lower clip. The upper clip and the lower clip are independent structures. The upper clip and the lower clip are clamped on a vertical line. The static contact 17 is respectively clamped in the vertical position by the upper clip and the lower clip. The upper clip and the lower clip on the device are opened left and right. The upper clip can be opened left or right, and the lower clip can be opened right or left.

[0028] The moving contact clamping assembly 9 is as Figure 5As shown in the figure, the moving contact clamping assembly 9 includes: a moving contact 19, a moving contact positioning pin 20, an upper electrode 21, a moving contact clip 22, a moving contact clip body 23, and a lower electrode 24. The moving contact clip body 23 is fixed on the upper surface of the mounting bracket; the moving contact clip body 23 is connected to the fixed end of the lower end of the moving contact clip 22 through a rotating shaft. The upper end of the moving contact clip 22 is a movable end, and the upper movable end is a spring clip. Pressing the upper movable end makes the clip open, and releasing it makes the upper movable end press tightly against the moving contact 19. The moving contact 19 is horizontally placed at the opening position of the moving contact clip 22; there are an upper electrode 21, a moving contact 19, and a lower electrode 24 at the mouth of the moving contact clip 22. The moving contact 19 is positioned on the lower electrode 24 through the moving contact positioning pin 20. The upper electrode 21 and the lower electrode 24 are respectively electrically connected to the moving contact 19, and the current of the contact is led to the low-resistance tester 2 through the upper electrode 21 and the lower electrode 24; press the reset button of the device operation indicator light 3 to open the moving contact clip 22, place the moving contact 19 on the moving contact positioning pin 20, press the start button of the device operation indicator light 3, and the static contact assembly 7 will turn to the moving contact clamping assembly 9, so that the static contact 17 contacts the moving contact 19 until the required contact pressure, and the contact resistance is measured through the low-resistance tester 2.

[0029] The moving contact clip 22 rotates 90 degrees through the rotating shaft, and the horizontal position of the moving contact clip 22 is just in good contact with the static contact.

[0030] The described moving contact clip body 23 is fixed on the upper surface of the mounting bracket. The upper surface of the mounting bracket includes a long strip opening groove. The middle rotating shaft 12 extends vertically upward to the bottom of the moving contact clip 22 to form a dynamic contact. The up and down movement of the middle rotating shaft 12 can make the static contact 17 contact the moving contact 19 until the required contact pressure.

[0031] The present invention will be specifically described in conjunction with the illustrations:

[0032] First, use the test equipment leveling feet 4 to level the test equipment until the pointer of the level is at the central position, then turn on the power, set the test contact pressure on the contact input and output interface unit 1, and then press the reset switch of the device operation indicator light 3. The servo motor 8 will drive the static contact clamping assembly 7 to rotate to the position limited by the limit plate 18.

[0033] Then use tweezers to open the static contact clip 16, and vertically place the static contact 17 into the static contact clip 17 with tweezers; then open the moving contact clip 22, place the moving contact 19 on the moving contact positioning pin 20 with tweezers, and then clamp it.

[0034] Press the start button of the device operation indicator light 3, and the servo motor 8 will drive the static contact clamping assembly to rotate until the static contact 17 contacts the moving contact 19. The contact method is the same as that of the whole machine contact, which is point contact. At this time, the pressure middle rotating shaft 12 will transmit the pressure of the pressure spring 14 to the pressure sensor 13, so that the pressure after the moving and static contacts contact reaches the set pressure. At this time, the low resistance tester 2 will measure the contact resistance of the moving and static contacts at this time through the four-wire method with the pre-set contact current, and display the test result on the display screen. If the test result is within the specified value, it will display qualified; if it exceeds the specified value, it will display unqualified.

[0035] The contact input and output interface unit 1 in the present invention includes an input keyboard, a reset button, a start button, a reset indicator light, a start indicator light and a display screen. The input keyboard is used to set the contact current, and then measure the contact resistance of the moving and static contacts at this time through the four-wire method. The start indicator light is turned on when the start button is pressed, and the reset indicator light is turned on when the reset button is pressed. If the test result is within the specified value, it will be displayed through the display screen.

[0036] The four-wire method described in the present invention is relative to the two-wire method. In the two-wire method, the current loop and the voltage measurement loop are combined into one, while in the four-wire method, the current loop and the voltage measurement loop are independently separated, which can eliminate the lead resistance and greatly improve the measurement accuracy. Low-resistance measurement is suitable for four-wire method measurement.

[0037] The above content is a further detailed description of the present invention in combination with specific implementation manners. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A method for testing the contact resistance of the whole machine of a simulated railway signal relay, including: Contact input / output interface unit (1), low-resistance tester (2), equipment operation indicator light (3), leveling feet for testing equipment (4), equipment housing (5), contact force measuring execution unit (6). The equipment housing (5) is horizontally fixed to the foundation through the leveling feet for testing equipment (4). The equipment housing (5) is divided into three layers. Among them, the middle layer is installed with the contact force measuring execution unit (6) and the low-resistance tester (2). The contact input / output interface unit (1) and the equipment operation indicator light (3) are respectively fixed on the upper layer or the lower layer or both the upper and lower layers; The contact force measuring execution unit (6) includes: static contact clamping assembly (7), servo motor (8), moving contact clamping assembly (9), force measuring mechanism (10), sensor mounting plate (11). The sensor mounting plate (11) is a frame structure, with the bottom fixedly connected to the equipment housing (5). The force measuring mechanism (10) is installed inside the frame. The moving contact clamping assembly (9) and the static contact clamping assembly (7) are installed on the left and right of the frame respectively. The servo motor (8) is installed at the top of the static contact clamping assembly (7). The servo motor (8) is connected to the static contact clamping assembly (7) through a rotating mechanism. The moving contact clamping assembly (9) on one side of the static contact clamping assembly (7) along the axial direction rotates, so that the static contact of the static contact clamping assembly (7) and the moving contact of the moving contact clamping assembly (9) are in contact. The sensing unit of the force measuring mechanism (10) is between the static contact and the moving contact. The contact pressure setting value is input through the input / output interface unit (1). When the reset button of the equipment operation indicator light (3) is pressed, the servo motor (8) drives the static contact clamping assembly (7) to rotate to the position limited by the limit plate (18), and the static contact (17) in the static contact clamping assembly (7) is correctly placed in the initial state at the static contact clamping assembly (7), and the moving contact (19) is correctly placed in the initial state at the moving contact clamping assembly. During operation, when the start button of the equipment indicator light (3) is pressed, the static contact clamping assembly (7) will rotate towards the moving contact clamping assembly (9) until the static and moving contacts are in contact and the contact pressure reaches the pressure setting value. The low-resistance tester (2) measures the contact resistance according to the four-wire method principle through the specified current of the contact, and displays the resistance value on the display screen of the contact input / output interface unit (1).

2. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 1, characterized in that: The described force measuring mechanism (10) includes a pressure intermediate rotating shaft (12), a pressure sensor (13), and a pressure spring (14). The pressure intermediate rotating shaft (12), the pressure sensor (13), and the pressure spring (14) are fixed on the mounting bracket. There are two pressure springs (14), which are respectively arranged on both sides of the mounting bracket. The pressure sensor (13) is located between the two pressure springs (14). The pressure intermediate rotating shaft (12) is at the upper ends of the two pressure springs (14). When the pressure intermediate rotating shaft (12) is subjected to a force and moves downward, under the action of the reverse forces of the two pressure springs (14), the bottom pressing plate of the pressure intermediate rotating shaft (12) acts on the pressure sensor (13). When the moving and static contacts come into contact, the pressure intermediate rotating shaft (12) will transmit the pressure of the pressure spring (14) to the pressure sensor (13), so that the applied pressure reaches the set pressure value. At this time, the low resistance tester (2) will measure the contact resistance of the moving and static contacts at this time by the four-wire method with the set contact current, and display the test result on the display screen of the contact input / output interface unit (1).

3. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 1, characterized in that: The static contact clamping assembly (7) includes: a static contact rotating arm (15), a static contact clip (16), a static contact (17), and a limit plate (18). The upper part of the static contact rotating arm (15) extends to one side to have a static contact clip (16). The mouth of the static contact clip (16) is the static contact (17). The lower part of the static contact rotating arm (15) has a limit plate (18). There is a rotating shaft at the upper end of the limit plate (18) and the lower end of the static contact rotating arm (15). During operation, when the reset button is pressed, the static contact clamping assembly (7) rotates to the position limited by the limit plate (18) through the rotating shaft, opens the static contact clip (16), and clamps the static contact (17) in the static contact clip (16). When the equipment start button is pressed, the static contact rotating arm (15) rotates to the position of the moving contact assembly (9) and comes into contact with the moving and static contacts.

4. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 3, characterized in that: The static contact clip (16) includes an upper clip and a lower clip. The upper clip and the lower clip are independent structures. The upper clip and the lower clip are clamped on a vertical line. The static contact (17) is respectively clamped in the vertical position by the upper clip and the lower clip. A constant test current is applied through the upper clip, and the potential difference generated by the current is led to the low resistance tester (2) for testing by the lower clip.

5. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 1, characterized in that: The moving contact clamping assembly (9) includes: a moving contact (19), a moving contact locating pin (20), an upper electrode (21), a moving contact clip (22), a moving contact clip body (23), and a lower electrode (24). The moving contact clip body (23) is fixed on the upper surface of the mounting bracket. The moving contact clip body (23) is connected to the fixed end of the lower end of the moving contact clip (22) through a rotating shaft. The upper end of the moving contact clip (22) is a movable end, and the upper movable end is a spring clip. Pressing the upper movable end opens the clip, and releasing it makes the upper movable end press the moving contact (19). The moving contact (19) is horizontally placed at the opening position of the moving contact clip (22). There are an upper electrode (21), a moving contact (19), and a lower electrode (24) at the mouth of the moving contact clip (22). The moving contact (19) is positioned on the lower electrode (24) through the moving contact locating pin (20). The upper electrode (21) and the lower electrode (24) are respectively electrically connected to the moving contact (19). A constant test current is applied through the upper electrode (21), and the potential difference generated by the current is led to the low-resistance tester (2) for testing through the lower electrode (24). Press the reset button of the equipment operation indicator light (3) to open the moving contact clip (22), place the moving contact (19) on the moving contact locating pin (20), and press the start button of the equipment operation indicator light (3). The stationary contact assembly (7) will turn to the moving contact clamping assembly (9) to make the stationary contact (17) contact the moving contact (19) until the required contact pressure is reached, and the contact resistance is measured through the low-resistance tester (2).

6. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 5, characterized in that: The moving contact clip (22) rotates 90 degrees through the rotating shaft, and the horizontal position of the moving contact clip (22) is in good contact with the stationary contact exactly.

7. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 5, characterized in that: The described moving contact clip body (23) is fixed on the upper surface of the mounting bracket. The upper surface of the mounting bracket includes a long strip of open slot. The pressure center rotating shaft (12) is perpendicular upward to the bottom of the moving contact clip (22) to form a dynamic contact. The up and down movement of the pressure center rotating shaft (12) can make the stationary contact (17) contact the moving contact (19) until the required contact pressure is reached.

8. The method for testing the contact resistance of the whole machine of a simulated railway signal relay according to claim 1, characterized in that: The described contact input / output interface unit (1) includes an input keyboard, a reset button, a start button, a reset indicator light, a start indicator light, and a display screen. The input keyboard is used to set the contact current, and then the contact resistance of the stationary and moving contacts at this time is measured by the four-wire method. The start indicator light is turned on when the start button is pressed, and the reset indicator light is turned on when the reset button is pressed. If the test result is within the specified value, it is displayed through the display screen.

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