Three-position switch for subway

Abstract

The utility model discloses a three-position switch for a subway, which comprises a switch base, a position switching mechanism and a self-locking mechanism, the switch base is used for installing the position switching mechanism and the self-locking mechanism, and the position switching mechanism is used for switching three position pieces of the switch at a pantograph position, a grounding position and a workshop. The self-locking mechanism is connected with the position switching mechanism, the position switching mechanism can work when the self-locking mechanism is in an unlocking state, the position switching mechanism cannot work when the self-locking mechanism is in a locking device, and the position switching mechanism comprises a plurality of compartment connecting ends. A plurality of carriages can be connected and controlled, blade contact is stable and reliable, and misoperation is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to three position switch technical field, especially use three position switch of subway. BACKGROUND

[0002] The subway three position switch plays a vital role in subway operation. The subway three position switch is similar to the traditional switch, and both are realized by changing the position of the switch contact to realize the on-off of the circuit. It can realize accurate control of the train running state and ensure the safety and stability of the train during running.

[0003] In the existing use, some three position switches are only connected with a single car, and long-term use will cause the loose connection of the blade to cause poor contact of the contact, which affects the use. In order to ensure safety and prevent misoperation, the three position switch in the subway generally has a self-locking function. The self-locking assembly currently used needs to be operated by two hands of the staff. Although the safety is ensured, the operation is relatively cumbersome. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a three position switch for subway.

[0005] The utility model adopts the technical scheme: a three position switch for subway, including switch base, position conversion mechanism and self-locking mechanism, the switch base is used for installing position conversion mechanism and self-locking mechanism, the position conversion mechanism is used for switching the switch in the pantograph position, the grounding position and the car position, the self-locking mechanism is connected with the position conversion mechanism, when the self-locking mechanism is in the unlocking state, the position conversion mechanism can work, when the self-locking mechanism is in the locking device, the position conversion mechanism cannot work, the position conversion mechanism includes a plurality of car connecting ends.

[0006] Further, the position conversion mechanism includes an upper support plate, a lower support plate, a shaft assembly and a blade assembly. The lower support plate has a through hole, and a bolt is arranged in the through hole. The bolt passes through the through hole and then passes through a support sleeve arranged below the lower support plate and cooperates with a screw hole arranged on the upper surface of the switch base to fix the lower support plate. The upper support plate is fixedly connected with the lower support plate through a pantograph terminal support column, a grounding terminal support column and a car terminal support column. The pantograph terminal support column is fixed with a pantograph terminal, the grounding terminal support column is fixed with a grounding terminal, and the car terminal support column is fixed with a car terminal. The shaft assembly is connected with the blade assembly. A plurality of blade assemblies are arranged in the space between the upper support plate and the lower support plate. The shaft assembly can control the blade assembly to realize the conversion of different positions.

[0007] Further, the blade assembly comprises a carriage terminal support column, the lower end of which is fixed with the lower support plate, and the upper end of which is fixed with the upper support plate, a plurality of carriage terminals are fixed on the carriage terminal support column, the carriage terminals are horizontally fixed on the carriage terminal support column, the outer side of the carriage terminals is the carriage electrical connection point, the inner side of the carriage terminals is rotatably connected with one side of the blade, the blade is horizontally arranged, a push plate is rotatably connected with the position close to the outer side of the middle part of the blade, one end of the push plate away from the blade is rotatably connected with a connecting block, the other end of the connecting block away from the push plate is fixed on the rotating shaft assembly, and a contact terminal is fixed on the carriage terminal support column and the other side of the blade in a corresponding position, wherein one of the contact terminals is connected with the workshop terminal;

[0008] Further, the rotating shaft assembly comprises a rotating shaft, the upper end of the rotating shaft penetrates through the upper support plate and is rotatably connected with the upper support plate, the lower end of the rotating shaft penetrates through the switch base and is rotatably connected with the switch base, the lower support plate is avoided from the rotating shaft, and the rotating shaft is not in contact with the lower support plate, a connecting arm is connected with the lower end of the rotating shaft, a handle is rotatably connected with one end of the connecting arm away from the rotating shaft, a limiting sleeve is arranged at the rotating position of the handle, and a clamping spring is fixed on the connecting arm, and the clamping spring is used for clamping the end of the handle when the handle is rotated to abut against the connecting arm;

[0009] Further, the upper end of the rotating shaft is fixedly connected with a rotating strip, the upper support plate is fixed with a first micro switch, a second micro switch and a third micro switch, the rotating strip is in contact with the first micro switch when the blade is in contact with the pantograph terminal, the rotating strip is in contact with the second micro switch when the blade is in contact with the grounding terminal, and the rotating strip is in contact with the third micro switch when the blade is in contact with the workshop terminal;

[0010] Further, the blade comprises an upper contact piece, a lower contact piece, a first rotating shaft, a first spring, a second rotating shaft, a second spring, a third rotating shaft and a third spring, the first rotating shaft penetrates through the upper contact piece, the carriage terminal and the lower contact piece in sequence from top to bottom, limiting parts are arranged at the upper and lower ends of the first rotating shaft, the first spring is sleeved on the part of the first rotating shaft penetrating through the lower contact piece, the second rotating shaft penetrates through the upper contact piece, the push plate and the lower contact piece in sequence from top to bottom, limiting parts are arranged at the upper and lower ends of the second rotating shaft, the second spring is sleeved on the part of the second rotating shaft penetrating through the lower contact piece, and the third rotating shaft penetrates through the upper contact piece and the lower contact piece in sequence from top to bottom, limiting parts are arranged at the upper and lower ends of the third rotating shaft, and the third spring is sleeved on the part of the third rotating shaft penetrating through the lower contact piece;

[0011] Further, the self-locking mechanism comprises a clamping disc, a self-locking slider, a self-locking top block, a fourth spring and a fifth spring, the clamping disc is fan-shaped, the clamping disc is fixedly connected with a rotating shaft at a center, the rotating shaft can drive the clamping disc to rotate, three arc-shaped clamping grooves are uniformly arranged on the circumference of the clamping disc, the self-locking slider is slidably arranged on a switch base on one side of the clamping disc, the switch base is provided with a first sliding groove matched with the self-locking slider, the first sliding groove penetrates the switch base, the self-locking slider is connected with a clamping block matched with the arc-shaped clamping groove on one side of the upper surface of the switch base close to the clamping disc, one end of the fourth spring is connected with the self-locking slider on one side of the lower surface of the switch base close to the clamping disc, the other end of the fourth spring is fixed on the switch base, a first inclined surface is arranged on the side of the self-locking slider away from the clamping disc, a second inclined surface matched with the first inclined surface is arranged on the upper end of the self-locking top block, a self-locking clamping groove matched with the self-locking top block is arranged on the lower surface of the self-locking slider, the self-locking top block is vertically slidably arranged on the switch base, the self-locking top block is connected with the fifth spring, the other end of the fifth spring is fixed on a mounting plate, the mounting plate is below the switch base and is fixedly connected with the switch base, the self-locking top block is connected with a first hemispherical top block through a connecting rod on the side close to the clamping disc, a second hemispherical top block matched with the first hemispherical top block is arranged on the lower surface of the clamping disc, and the switch base is provided with a clearance for the connecting rod;

[0012] Further, one side of the self-locking slider on the lower surface of the switch base is connected with a handle;

[0013] Further, the limiting clamping sleeve is arranged at the connection between the handle and the connecting arm, and the handle is provided with a clearance on the side close to the handle;

[0014] Further, the lower surface of the switch base is provided with a switch state indicator, and the switch position indicator comprises a pantograph position indicator, a car position indicator and a grounding position indicator.

[0015] The utility model discloses a plurality of blade assemblies are set up, and the carriage terminal connected with the blade assembly is set up for each group of blade assemblies, the number of blade assemblies and carriage terminals is set according to the number of subway carriages, and the demand of three-position switch control multiple carriages is satisfied, the double contact plate is set up through the blade assembly, and the spring is sleeved below the contact plate, the double plate spacing is guaranteed, the blade can be stably contacted, and the stability of switch use is guaranteed, when the self-locking assembly and the clamping disc linkage need to rotate the position conversion mechanism, the staff pulls the self-locking slider, the self-locking slider moves to the self-locking top block, the first inclined plane cooperates with the second inclined plane, when the self-locking top block is clamped into the self-locking slot and completes unlocking, the clamping block leaves the arc-shaped slot at this time, then the second hemispherical top block below the surface of the clamping disc and the first hemispherical top block are contacted and make the first hemispherical top block move downward, the first hemispherical top block drives the self-locking top block downward until the self-locking top block is separated from the self-locking slot, and the self-locking slider slides under the action of the fourth spring, at this time, the position conversion mechanism is rotated to the clamping block and is clamped into the arc-shaped slot, and the self-locking is completed, when not using, the handle is attached on the connecting arm, and the clamping spring that can clamp the handle is set up on the connecting arm, and effectively prevent misoperation.

[0016] The utility model can connect control multiple carriages, and the blade contact is stable and reliable, and effectively prevents misoperation. DRAWINGS

[0017] Figure 1 It is the structure schematic drawing of the utility model.

[0018] Figure 2 It is the structure schematic drawing of the utility model pivot assembly.

[0019] Figure 3 It is the structure schematic drawing of the utility model blade assembly.

[0020] Figure 4 It is the structure schematic drawing of the utility model switch base bottom.

[0021] Figure 5 It is the structure schematic drawing of the utility model upper support plate top structure.

[0022] Figure 6 It is the schematic diagram of the utility model self-locking mechanism.

[0023] In the diagram: 1000. Switch base, 1100. Pantograph position indicator, 1200. Workshop exterior indicator, 1300. Connection position indicator, 2000. Position switching mechanism, 2100. Upper support plate, 2110. First micro switch, 2120. Second micro switch, 2130. Third micro switch, 2200. Lower support plate, 2300. Rotating shaft assembly, 2310. Rotating shaft, 2320. Connecting arm, 2330. Handle, 2340. Limiting sleeve, 2350. Snap-fit ​​spring, 2400. Blade assembly, 2410. Carriage terminal support column, 2411. Carriage terminal, 2420. Blade, 2421. Upper contact piece, 2422. Lower contact piece, 2423. First rotating shaft, 2424. First spring, 2425. Second spring, 2426. Second spring, 2427. Third rotating shaft. 2428. Third spring; 2430. Push plate; 2440. Connecting block; 2450. Contact terminal; 2500. Bolt; 2600. Support sleeve; 2700. Pantograph terminal support column; 2710. Pantograph terminal; 2800. Grounding terminal support column; 2810. Grounding terminal; 2900. Workshop terminal support column; 2910. Workshop terminal; 3000. Self-locking mechanism; 3100. Lock. 3110. Arc-shaped slot; 3120. Second hemispherical top block; 3200. Self-locking slider; 3210. Locking block; 3220. First inclined surface; 3230. Self-locking slot; 3240. Handle; 3300. Self-locking top block; 3310. Second inclined surface; 3320. Mounting plate; 3330. Connecting rod; 3340. First hemispherical top block; 3400. Fourth spring; 3500. Fifth spring. Detailed Implementation

[0024] To better understand the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, further illustrates this utility model.

[0025] like Figures 1-6 As shown, a three-position switch for subway use includes a switch base 1000, a position switching mechanism 2000, and a self-locking mechanism 3000. The switch base 1000 is used to install the position switching mechanism 2000 and the self-locking mechanism 3000. The position switching mechanism 2000 is used to switch the switch between three positions: pantograph position, contact position, and car position. The self-locking mechanism 3000 is connected to the position switching mechanism 2000. When the self-locking mechanism 3000 is in the unlocked state, the position switching mechanism 2000 can work. When the self-locking mechanism 3000 is in the locked state, the position switching mechanism 2000 cannot work. The position switching mechanism 2000 includes multiple car connection ends.

[0026] Specifically, the position conversion mechanism 2000 comprises an upper support plate 2100, a lower support plate 2200, a rotating shaft assembly 2300, and a blade assembly 2400. The lower support plate 2200 is provided with a through hole, and a bolt 2500 is arranged in the through hole. The bolt 2500 passes through the through hole and then passes through a support sleeve 2600 arranged below the lower support plate 2200 and cooperates with a threaded hole arranged on the upper surface of the switch base 1000 to fix the lower support plate 2200. The upper support plate 2100 is fixedly connected with the lower support plate 2200 through a pantograph terminal support column 2700, a grounding terminal support column 2800, and a car terminal support column 2900. The pantograph terminal support column 2700 is fixedly provided with a pantograph terminal 2710. The grounding terminal support column 2800 is fixedly provided with a grounding terminal 2810. The car terminal support column 2900 is fixedly provided with a car terminal 2910. The rotating shaft assembly 2300 is connected with the blade assembly 2400. A plurality of blade assemblies 2400 are arranged in the space between the upper support plate 2100 and the lower support plate 2200. The rotating shaft assembly 2300 can control the blade assembly 2400 to realize conversion of different positions. The number of blade assemblies 2400 is set according to the number of cars.

[0027] Preferably, the blade assembly 2400 comprises a car terminal support column 2410. The lower end of the car terminal support column 2410 is fixedly connected with the lower support plate 2200, and the upper end is fixedly connected with the upper support plate 2100. A plurality of car terminals 2411 are fixedly arranged on the car terminal support column 2410. The number of car terminals 2411 is the same as that of blades 2420. The number of car terminals 2411 is set according to the number of cars. The car terminals 2411 are horizontally fixed on the car terminal support column 2410. The outer side of the car terminal 2411 is a car electrical connection point. The inner side of the car terminal 2411 is rotatably connected with one side of the blade 2420. The blade 2420 is horizontally arranged. A push plate 2430 is rotatably connected with the position close to the outer side of the middle part of the blade 2420. One end of the push plate 2430 away from the blade 2420 is rotatably connected with a connecting block 2440. The other end of the connecting block 2440 away from the push plate 2430 is fixedly connected with the rotating shaft assembly 2300. A contact terminal 2450 is fixedly arranged on the other side of the blade 2420 corresponding to the car terminal support column 2900. One of the contact terminals 2450 is connected with the car terminal 2910.

[0028] Preferably, the rotating shaft assembly 2300 comprises a rotating shaft 2310, the upper end of the rotating shaft 2310 penetrates the upper support plate 2100 and is rotatably connected with the upper support plate 2100, the lower end of the rotating shaft 2310 penetrates the switch base 1000 and is rotatably connected with the switch base 1000, the lower support plate 2200 is away from the rotating shaft 2310, the rotating shaft 2310 is not in contact with the lower support plate 2200, the lower end of the rotating shaft 2310 is connected with a connecting arm 2320, the end of the connecting arm 2320 away from the rotating shaft 2310 is rotatably connected with a handle 2330, the handle 2330 is provided with a limiting sleeve 2340 at the rotating position, the limiting sleeve 2340 is used for limiting the rotation of the handle 2330, so that the handle 2330 stops rotating when the handle 2330 is rotated to be 90 degrees with the connecting arm 2320, the limiting sleeve 2340 is arranged at the connecting position of the handle 2330 and the connecting arm 2320 and is used for limiting the rotation of the handle 2330, the side of the sleeve close to the handle 2330 is away from the handle 2330, the connecting arm 2320 is fixedly connected with a clamping spring 2350, the clamping spring 2350 is used for clamping the end of the handle 2330 when the handle 2330 is rotated to be close to the connecting arm 2320, when not in use, the staff rotates the handle 2330 to be close to the connecting arm 2320, and the handle 2330 is clamped into the clamping spring 2350;

[0029] Preferably, the upper end of the rotating shaft is fixedly connected with a rotating strip, the upper support plate 2100 is fixedly connected with a first micro switch 2110, a second micro switch 2120 and a third micro switch 2130, the rotating strip is in contact with the first micro switch 2110 when the blade 2420 is in contact with the pantograph terminal 2710, the rotating strip is in contact with the second micro switch 2120 when the blade 2420 is in contact with the grounding terminal 2810, and the rotating strip is in contact with the third micro switch 2130 when the blade 2420 is in contact with the vehicle terminal 2910, the three micro switches are used for limiting the state of the three-position switch, which is convenient for the staff to observe the state of the three-position switch;

[0030] Preferably, the blade 2420 comprises an upper contact piece 2421, a lower contact piece 2422, a first rotating shaft 2423, a first spring 2424, a second rotating shaft 2425, a second spring 2426, a third rotating shaft 2427 and a third spring 2428, the first rotating shaft 2423 passes through the upper contact piece 2421, the carriage terminal 2411 and the lower contact piece 2422 in turn from top to bottom, the upper and lower ends of the first rotating shaft 2423 are provided with limiting portions, the part of the first rotating shaft 2423 passing through the lower contact piece 2422 is sleeved with the first spring 2424, the second rotating shaft 2425 passes through the upper contact piece 2421, the push plate 2430 and the lower contact piece 2422 in turn from top to bottom, the upper and lower ends of the second rotating shaft 2425 are provided with limiting portions, the part of the second rotating shaft 2425 passing through the lower contact piece 2422 is sleeved with the second spring 2426, the third rotating shaft 2427 passes through the upper contact piece 2421 and the lower contact piece 2422 in turn from top to bottom, the upper and lower ends of the third rotating shaft 2427 are provided with limiting portions, the part of the third rotating shaft 2427 passing through the lower contact piece 2422 is sleeved with the third spring 2428, the first spring 2424, the second spring 2426 and the second spring 2426 are in a compressed state after installation, so as to ensure the distance between the two contact pieces and the stability of the contact pieces;

[0031] Preferably, the self-locking mechanism 3000 comprises a clamping disc 3100, a self-locking slider 3200, a self-locking top block, a fourth spring 3400, a fifth spring 3500, the clamping disc 3100 is a sector, the clamping disc 3100 is fixedly connected with the rotating shaft 2310 at the center, the rotating shaft 2310 can drive the clamping disc 3100 to rotate, three arc clamping grooves 3110 are uniformly arranged on the circumference of the clamping disc 3100, the self-locking slider 3200 is slidably arranged on the switch base 1000 on one side of the clamping disc 3100, the switch base 1000 is provided with a first sliding groove matched with the self-locking slider 3200, the first sliding groove penetrates through the switch base 1000, the self-locking slider 3200 is connected with a clamping block 3210 matched with the arc clamping groove 3110 on the side close to the clamping disc 3100 on the upper surface of the switch base 1000, one end of the fourth spring 3400 is connected with the self-locking slider 3200 on the side close to the clamping disc 3100 on the lower surface of the switch base 1000, the other end of the fourth spring 3400 is fixedly connected to the switch base 1000, a first inclined surface 3220 is arranged on the side away from the clamping disc 3100 of the self-locking slider 3200, a second inclined surface matched with the first inclined surface 3220 is arranged on the upper end of the self-locking top block, a self-locking clamping groove 3230 matched with the self-locking top block is arranged on the lower surface of the self-locking slider 3200, the self-locking top block is vertically and slidably arranged on the switch base 1000, the self-locking top block is connected with the fifth spring 3500 at the lower end, the other end of the fifth spring 3500 is fixedly connected to the mounting plate, the mounting plate is located below the switch base 1000 and is fixedly connected with the switch base 1000, a first hemispherical top block 3340 is connected with the self-locking top block on the side close to the clamping disc 3100 through a connecting rod 3330, a second hemispherical top block 3120 matched with the first hemispherical top block 3340 is arranged on the lower surface of the clamping disc 3100, and the switch base 1000 is provided with a position avoiding part for the connecting rod 3330.

[0032] Preferably, the self-locking slider 3200 is connected with a handle on one side of the lower surface of the switch base 1000.

[0033] Preferably, the lower surface of the switch base 1000 is provided with a switch state indicator and a switch position indicator, the switch state indicator comprises a pantograph position indicator 1100, a car position indicator 1200 and a grounding position indicator 1300.

[0034] Working principle: in use, first pull the handle connected with the self-locking slider 3200, the handle drives the self-locking slider 3200 to move towards the self-locking top block, the first inclined surface 3220 cooperates with the second inclined surface, when the self-locking top block is clamped into the self-locking clamping groove 3230, the unlocking is completed, at this time the clamping block 3210 leaves the arc-shaped clamping groove 3110, then rotate the handle 2330, the second hemispherical top block 3120 on the lower surface of the clamping disc 3100 contacts the first hemispherical top block 3340 and makes the first hemispherical top block 3340 move downward, the first hemispherical top block 3340 drives the self-locking top block downward until the self-locking clamping groove 3230 is separated, under the action of the fourth spring 3400, the self-locking slider 3200 slides, at this time the position conversion mechanism 2000 rotates to the position clamping block 3210 clamps into the arc-shaped clamping groove 3110, the self-locking is completed; when rotating the handle 2330, first remove the handle 2330 from the clamping spring sheet 2350, rotate the handle 2330 to 90 degrees, then rotate the handle 2330, the handle 2330 drives the connecting arm 2320 to rotate, the connecting arm 2320 drives the rotating shaft 2310 to rotate, the rotating shaft 2310 drives the connecting block 2440, the connecting block 2440 rotates and pulls the push plate 2430 to rotate, because the blade 2420 is rotatably connected with the car terminal 2411 on one side and is not connected on the other end, the push plate 2430 rotates and drives the blade 2420 to rotate with the connecting part between the blade 2420 and the car terminal 2411 as the center, when the movable side of the blade 2420 contacts the pantograph terminal 2710, the connecting arm 2320 corresponds to the indication on the pantograph position indication plate 1100, when the movable side of the blade 2420 contacts the grounding position terminal, the connecting arm 2320 corresponds to the indication on the grounding position indication plate 1300, when the movable side of the blade 2420 contacts the car terminal 2910, the connecting arm 2320 corresponds to the indication on the car position indication plate 1200, after the operation is completed, rotate the handle 2330 to the position close to the connecting arm 2320 and clamp into the clamping spring sheet 2350.

[0035] The above only describes the preferred embodiments of the present application, and equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A three position switch for use in a subway, characterized in that The utility model provides a switch base, position conversion mechanism and self locking mechanism, the switch base is used for installing position conversion mechanism and self locking mechanism, position conversion mechanism is used for switch in the pantograph position, ground position and car room for three position piece conversion, self locking mechanism is connected with position conversion mechanism, when self locking mechanism is in the unlocking state position conversion mechanism can work, when self locking mechanism is in the locking device position conversion mechanism cannot work, position conversion mechanism includes a plurality of car room connecting end.

2. The three position switch for a subway according to claim 1, wherein The position conversion mechanism includes an upper support plate, a lower support plate, a rotating shaft assembly, and a blade assembly. The lower support plate has a through hole, and a bolt is arranged in the through hole. The bolt passes through the through hole and then passes through a support sleeve arranged below the lower support plate and cooperates with a screw hole arranged on the upper surface of the switch base to fix the lower support plate. The upper support plate is fixedly connected with the lower support plate through pantograph terminal support columns, grounding terminal support columns, and car room terminal support columns. The pantograph terminal support columns are fixedly connected with pantograph terminals. The grounding terminal support columns are fixedly connected with grounding terminals. The car room terminal support columns are fixedly connected with car room terminals. The rotating shaft assembly is connected with the blade assembly. A plurality of blade assemblies are arranged in the space between the upper support plate and the lower support plate. The rotating shaft assembly can control the blade assembly to realize the conversion of different positions.

3. The three position switch for a subway according to claim 2, wherein The blade assembly includes a car room terminal support column. The lower end of the car room terminal support column is fixedly connected with the lower support plate, and the upper end is fixedly connected with the upper support plate. A plurality of car room terminals are fixedly connected with the car room terminal support column. The car room terminals are horizontally fixed on the car room terminal support column. The outer side of the car room terminals is the car room electrical connection point. The inner side of the car room terminals is rotatably connected with one side of the blade. The blade is horizontally arranged. A push plate is rotatably connected with the position close to the outer side of the middle part of the blade. The end of the push plate away from the blade is rotatably connected with a connecting block. The end of the connecting block away from the push plate is fixedly connected with the rotating shaft assembly. The car room terminal support column is fixedly connected with a contact terminal at the position corresponding to the other side of the blade. One of the contact terminals is connected with the car room terminal.

4. The three position switch for a subway train according to claim 3, wherein The rotating shaft assembly includes a rotating shaft. The upper end of the rotating shaft passes through the upper support plate and is rotatably connected with the upper support plate. The lower end of the rotating shaft passes through the switch base and is rotatably connected with the switch base. The lower support plate is designed to avoid the rotating shaft. The rotating shaft does not contact the lower support plate. A connecting arm is connected with the lower end of the rotating shaft. A handle is rotatably connected with the end of the connecting arm away from the rotating shaft. A limiting sleeve is arranged at the rotating position of the handle. A clamping spring is fixedly connected with the connecting arm. The clamping spring is used to clamp the end of the handle when the handle is rotated to the position close to the connecting arm.

5. The three position switch for a subway train according to claim 4, wherein The upper end of the rotating shaft is fixedly connected with a rotating strip. A first micro switch, a second micro switch, and a third micro switch are fixedly connected with the upper support plate. The rotating strip contacts the first micro switch when the blade contacts the pantograph terminal. The rotating strip contacts the second micro switch when the blade contacts the grounding terminal. The rotating strip contacts the third micro switch when the blade contacts the car room terminal.

6. The three position switch for a subway train according to claim 3, wherein The blade comprises an upper contact sheet, a lower contact sheet, a first rotating shaft, a first spring, a second rotating shaft, a second spring, a third rotating shaft and a third spring, the first rotating shaft passes through the upper contact sheet, the carriage terminal and the lower contact sheet in sequence from top to bottom, the upper and lower ends of the first rotating shaft are provided with limiting parts, the part of the first rotating shaft passing through the lower contact sheet is sleeved with the first spring, the second rotating shaft passes through the upper contact sheet, the push plate and the lower contact sheet in sequence from top to bottom, the upper and lower ends of the second rotating shaft are provided with limiting parts, the part of the second rotating shaft passing through the lower contact sheet is sleeved with the second spring, the third rotating shaft passes through the upper contact sheet and the lower contact sheet in sequence from top to bottom, the upper and lower ends of the third rotating shaft are provided with limiting parts, and the part of the third rotating shaft passing through the lower contact sheet is sleeved with the third spring.

7. The three position switch for a subway train according to claim 4, wherein The self-locking mechanism comprises a clamping disc, a self-locking slider, a self-locking top block, a fourth spring and a fifth spring, the clamping disc is fan-shaped, the clamping disc is fixedly connected with a rotating shaft at the center, the rotating shaft can drive the clamping disc to rotate, three arc clamping grooves are uniformly arranged on the circumference of the clamping disc, the self-locking slider is slidably arranged on a switch base on one side of the clamping disc, the switch base is provided with a first sliding groove matched with the self-locking slider, the first sliding groove penetrates the switch base, the self-locking slider is connected with a clamping block matched with the arc clamping groove on one side of the upper surface of the switch base and close to the clamping disc, one end of the fourth spring is connected with the self-locking slider on one side of the lower surface of the switch base and close to the clamping disc, the other end of the fourth spring is fixed on the switch base, a first inclined surface is arranged on one side of the self-locking slider away from the clamping disc, a second inclined surface matched with the first inclined surface is arranged on the upper end of the self-locking top block, a self-locking clamping groove matched with the self-locking top block is arranged on the lower surface of the self-locking slider, the self-locking top block is vertically and slidably arranged on the switch base, the self-locking top block is connected with the fifth spring at the lower end, the other end of the fifth spring is fixed on the mounting plate, the mounting plate is below the switch base and is fixedly connected with the switch base, the self-locking top block is connected with a first hemispherical top block through a connecting rod on one side close to the clamping disc, a second hemispherical top block matched with the first hemispherical top block is arranged on the lower surface of the clamping disc, and the switch base is provided with an avoidance position for the connecting rod.

8. The three position switch for a subway train according to claim 7, wherein A handle is connected to one side of the lower surface of the self-locking slider.

9. The three position switch for a subway train according to claim 4, wherein The limiting clamping sleeve is arranged at the connection between the handle and the connecting arm, and an avoidance position is arranged on one side of the clamping sleeve close to the handle for the handle.

10. The three position switch for a subway train according to claim 1, wherein A switch state indicator is arranged on the lower surface of the switch base, and the switch position indicator comprises a pantograph position indicator, a car position indicator and a grounding position indicator.

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