A charging pile tension automatic winding cable mechanism

Abstract

The application discloses to the technical field of automobile charging pile, specifically a kind of charging pile tension automatic winding cable mechanism, including charging pile, protection carding component and lubricating component, the top of charging pile is equipped with top bracket, the winding steel rope is wound by the tension winding disc of winding motor drive in the device, then the cable of winding steel rope and charging gun connection is fixedly connected, when charging gun is used, operator pulls out charging gun head, then pulls winding steel rope, winding motor controls tension winding disc to pay winding steel rope, cable can be moved to vehicle with operator, otherwise cable is pulled and lifted by winding steel rope, avoid repeatedly bending and cause connection position loose and loss, in addition, during use, through protection carding component and lubricating component, rainwater and pollutants adhered to the surface of winding steel rope can be treated, the rotation stability of winding motor driven tension winding disc can be automatically maintained, and the body and mind are convenient, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of vehicle charging pile technology, specifically to an automatic tension rewinding cable mechanism for charging piles. Background Technology

[0002] Car charging piles, also known as electric vehicle charging stations, are specialized devices that provide electrical energy to electric vehicles. They are connected to the car through a power output terminal with a charging plug, converting grid power into electrical energy stored in the vehicle's battery, enabling the electric vehicle to store enough electricity to support its operation.

[0003] An existing invention, CN114347828A, discloses an electric vehicle charging pile with an automatic cable rewinding function. It includes a charging pile body, a controller installed within the charging pile body, an authentication device and a display device installed on the charging pile body, both connected to the controller. The charging pile body is connected to a charging cable and a charging plug for charging electric vehicles. One end of the charging cable is connected to the charging pile body, and the other end is connected to the charging plug. The charging pile body has a charging slot for inserting the charging plug. A rewinding device for rewinding the charging cable is installed on the charging pile body. This solution achieves cable rewinding by folding the cable within the housing using the rewinding device. However, since one end of the charging cable needs to be fixedly connected to the charging pile, prolonged use can easily damage the connection point, and repeated bending of the charging cable can affect its lifespan, posing certain safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic tension rewinding cable mechanism for charging piles to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic tension rewinding cable mechanism for charging piles, comprising:

[0006] The charging pile has a top support on top, and cable winding boxes are vertically installed on both sides of the top support. A winding motor is installed on one side of each cable winding box. A tension winding disc is rotatably installed inside the cable winding box. The tension winding disc is connected to the winding motor, and a winding steel rope is wound on the tension winding disc. The winding motor realizes the winding control of the tension winding disc on the winding steel rope.

[0007] A protective combing assembly is vertically installed at the lower end of one side of the cable winding box. The protective combing assembly includes a processing sleeve and an annular cavity disc. The winding steel rope passes through the processing sleeve. An air source pipe is provided on one side of the annular cavity disc, passing through the cable winding box and the processing sleeve. A lubrication assembly is connected to one side of the air source pipe. The lubrication assembly is connected to the winding motor to realize the self-lubricating operation of the winding motor driving rotation. The lubrication assembly includes a transfer air pipe, an oil storage box, and a one-way oil pipe.

[0008] Preferably, the processing sleeve is installed at the lower end of the cable winding box, and the upper and lower ends of the processing sleeve are both horizontally provided with first support frames. Two guide wheels are rotatably provided on each of the first support frames, and the side of the winding steel rope that passes through the processing sleeve is located between the two guide wheels.

[0009] Preferably, the annular cavity disc receiving the wound steel rope is placed on one side inside the processing sleeve, the air source pipe is connected to the annular cavity disc, and the lower end of the annular cavity disc is connected to a plurality of first air holes, which are inclined towards the wound steel rope respectively.

[0010] Preferably, a second support frame is horizontally provided below the annular cavity disk inside the processing sleeve. Two brush rollers are rotatably provided on the second support frame. The bristles on one side of the two brush rollers are in contact with both sides of the winding steel rope. A blowing pipe is connected to the side of the annular cavity disk away from the air source pipe. A second air hole is opened through the lower end of the blowing pipe. One side of the two brush rollers passes through the second support frame and is fitted with a blowing impeller. The second air hole faces the blades of the two blowing impellers.

[0011] Preferably, the processing sleeve has a buffer groove at its lower end outside the cable winding box, a buffer frame is inserted into the buffer groove, and strip grooves are opened on both sides of the processing sleeve near the buffer frame. Anti-detachment blocks are installed through one side of the buffer frame in the strip groove. Several compression springs are provided at the upper end of the buffer frame in the buffer groove. A cutting groove is vertically connected to the side of the buffer groove near the air source pipe. The cutting groove is connected to the air source pipe. A cutting plate is vertically provided on the side of the buffer frame in the cutting groove, and the width of the cutting plate is greater than the inner diameter of the air source pipe.

[0012] Preferably, the lower end of the winding steel rope through the processing sleeve is provided with a stop block, and the lower end of the stop block is provided with a cable connecting ring. When the cutting plate blocks and cuts off the air source pipe, the upper end of the stop block squeezes the buffer frame into the buffer groove.

[0013] Preferably, the cable winding box is provided with a bearing mounting seat on the side near the winding motor, and a drive spindle is provided on one side of the cable winding box. The drive spindle is inserted into the bearing mounting seat through two bearings, and one side of the drive spindle is inserted into the cable winding box. The tension winding reel is sleeved on the drive spindle.

[0014] Preferably, the tension winding reel has a keyway on one side of the drive spindle, and a sensing key bar is provided on the side of the drive spindle located in the keyway. The sensing key bar is inserted into the keyway, and a conductive slip ring is provided on one side of the cable winding box. The conductive slip ring is electrically connected to the drive spindle and is used to power the sensing element in the sensing key bar.

[0015] Preferably, the adapter air pipe is connected to the side of the air source pipe located outside the cable winding box, and the oil storage box is vertically installed on the side of the cable winding box near the adapter air pipe. The lower end of the oil storage box is provided with a combined mounting block, and the adapter air pipe is installed through the combined mounting block. One side of the combined mounting block is connected to the oil storage box and has an oil replenishment groove. The one-way oil pipe is horizontally installed on the side of the combined mounting block away from the air source pipe. One side of the one-way oil pipe is connected to the stop block. The position of the one-way oil pipe connected to the adapter air pipe is closer to the air source pipe than the oil replenishment groove. One side of the oil replenishment groove is connected to the one-way oil pipe.

[0016] Preferably, a switching piston is horizontally movable on one side of the oil replenishment groove inside the transfer air pipe. A prismatic guide rod is provided at the end of the switching piston away from the air source pipe. The prismatic guide rod passes through the transfer air pipe and is provided with a constraint block. A return spring is sleeved on the side of the prismatic guide rod inside the transfer air pipe. A docking groove is vertically opened on one side of the switching piston. Under normal conditions, the docking groove of the switching piston corresponds to the oil replenishment groove, and the switching piston blocks the one-way oil pipe. When the switching piston moves horizontally to the maximum extent to the position of the prismatic guide rod, the switching piston is misaligned with the one-way oil pipe but blocks the oil replenishment groove. An oil mist hose is connected to the upper end of the bearing mounting seat, and one side of the oil mist hose is connected to one end of the one-way oil pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This device uses a tension winding reel driven by a winding motor to wind up a steel rope. The wound steel rope is then fixedly connected to the cable connected to the charging gun. When using the charging gun, the operator pulls out the charging gun head and then pulls the winding steel rope. The winding motor controls the tension winding reel to unwind the steel rope. The cable can move with the operator towards the vehicle, or conversely, the cable is lifted by the winding steel rope, avoiding repeated bending that could cause loosening and damage to the connection. Furthermore, during use, the protective combing and lubrication components can treat rainwater and contaminants adhering to the surface of the winding steel rope. The device also automatically maintains the rotational stability of the tension winding reel driven by the winding motor. Operation is convenient, safe, and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the cable winding box installation structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the tension winding reel installation structure of the present invention;

[0022] Figure 4 This is a side sectional view of the tension winding reel connection of the present invention;

[0023] Figure 5 For the present invention Figure 4 Schematic diagram of part A;

[0024] Figure 6 This is a side sectional view of the inner connection of the sleeve in this invention;

[0025] Figure 7 For the present invention Figure 6 Schematic diagram of part B;

[0026] Figure 8 For the present invention Figure 7 Schematic diagram of part C;

[0027] Figure 9 This is a side sectional view of the connection structure of the lubrication assembly of the present invention;

[0028] Figure 10 For the present invention Figure 9 Schematic diagram of part D.

[0029] In the diagram: 1. Charging pile; 2. Top bracket; 3. Cable winding box; 4. Winding motor; 5. Tension winding reel; 6. Winding steel rope; 7. Processing sleeve; 8. Stop block; 9. Cable connecting ring; 11. Guide wheel; 12. Annular cavity disc; 13. First air hole; 14. Air source pipe; 15. Brush roller; 16. Blowing pipe; 17. Second air hole; 18. Blowing impeller; 19. Bearing mounting seat; 20. Drive spindle; 21. Actuating keyway; 22. Sensing key bar; 23. Conductive slip ring; 24. Buffer groove; 25. Buffer frame; 26. Strip groove; 27. Cut-off plate; 28. Adapter air pipe; 29. ​​Oil storage box; 30. Combination mounting block; 31. Switching piston; 32. Prism-shaped guide rod; 33. Return spring; 34. One-way oil pipe; 35. Oil replenishment groove; 36. Connecting groove; 37. Oil mist hose. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see the appendix Figure 1-10 This application provides the following technical solutions.

[0032] Example 1: An automatic tension cable winding mechanism for a charging pile includes a charging pile 1, a top support 2 above the charging pile 1, and cable winding boxes 3 vertically mounted on both sides of the top support 2. A winding motor 4 is mounted on one side of each cable winding box 3. A tension winding reel 5 is rotatably mounted inside the cable winding box 3. The tension winding reel 5 is connected to the winding motor 4, and a winding steel rope 6 is wound on the tension winding reel 5. The winding motor 4 controls the winding of the tension winding reel 5 onto the winding steel rope 6. The lower end of the processing sleeve 7 is provided with a stop block 8, and the lower end of the stop block 8 is provided with a cable connecting ring 9. The distance between the two cable winding boxes 3 is greater than the width of the charging pile 1. The winding steel rope 6 is fixedly connected to the charging gun cable of the charging pile 1 through the cable connecting ring 9. When the operator uses the charging gun, the winding steel rope 6 is unwound, and vice versa. The connection position between the cable connecting ring 9 and the charging gun cable is in the middle, which does not affect the charging gun head being inserted into the charging pile 1. When not in use, the cable is suspended by the winding steel rope 6.

[0033] A protective combing assembly is installed to protect and comb the winding and unwinding of the coiled steel rope 6. The protective combing assembly is vertically installed at the lower end of one side of the cable winding box 3. The protective combing assembly includes a processing sleeve 7 and an annular cavity disc 12. The coiled steel rope 6 passes through the processing sleeve 7. An air source pipe 14 is installed on one side of the annular cavity disc 12, which passes through the cable winding box 3 and the processing sleeve 7. The processing sleeve 7 passes through the lower end of the cable winding box 3. The upper and lower ends of the processing sleeve 7 are equipped with first support frames horizontally. Two guide wheels 11 are rotatably installed on each of the first support frames. The side of the coiled steel rope 6 that passes through the processing sleeve 7 is located between the two guide wheels 11. The two guide wheels 11 can constrain and guide the coiled steel rope 6 to avoid excessive wear.

[0034] The annular cavity disc 12, which receives the wound steel rope 6, is placed on one side inside the processing sleeve 7. An air source pipe 14 is connected to the annular cavity disc 12. Several first air holes 13 are opened at the lower end of the annular cavity disc 12, each inclined towards the wound steel rope 6. A second support frame is horizontally positioned below the annular cavity disc 12 inside the processing sleeve 7. Two brush rollers 15 are rotatably mounted on the second support frame. The bristles on one side of each brush roller 15 contact both sides of the wound steel rope 6. A blowing pipe 16 is connected to the side of the annular cavity disc 12 away from the air source pipe 14. A second air hole 17 is opened through the lower end of the blowing pipe 16. One side of each of the two brush rollers 15 passes through the second support frame and is fitted with... When the air source pipe 14 blows high-pressure gas into the annular cavity of the annular cavity disk 12, the high-pressure gas can be ejected at high speed from the first air hole 13 and the second air hole 17. The airflow ejected from the second air hole 17 blows the two impellers 18, driving the two brush rollers 15 to rotate, thus brushing and cleaning the surface of the winding steel rope 6. This prevents contaminants or rainwater on the surface of the winding steel rope 6 from being carried into the cable winding box 3 when it is exposed to the outside, which would contaminate the tension winding disk 5 and affect the use of the sensing elements later. During this process, the high-pressure airflow at the first air hole 13 blows towards the winding steel rope 6, which can blow the contaminants or rainwater brushed on the surface of the winding steel rope 6 downwards.

[0035] A buffer groove 24 is provided at the lower end of the processing sleeve 7 outside the cable winding box 3. A buffer frame 25 is inserted into the buffer groove 24. Strip grooves 26 are provided on both sides of the processing sleeve 7 near the buffer frame 25. Anti-detachment blocks are provided through one side of the buffer frame 25 located in the strip groove 26. Several downward pressure springs are provided at the upper end of the buffer frame 25 located in the buffer groove 24. A cutting-off groove is vertically connected to the air source pipe 14 on the side of the buffer groove 24. The cutting-off groove is connected to the air source pipe 14. A cutting plate 27 is vertically installed on one side of the cutting groove, and the width of the cutting plate 27 is greater than the inner diameter of the air source pipe 14. When the cutting plate 27 blocks and cuts off the air source pipe 14, the upper end of the stop block 8 squeezes the buffer frame 25 into the buffer groove 24. The setting of the buffer frame 25 and the stop block 8 can limit the winding of the winding steel rope 6. At the same time, the contact between the stop block 8 and the buffer frame 25, and the elastic setting of the buffer frame 25, prevent the stop block 8 from directly colliding with the processing sleeve 7.

[0036] A bearing mounting seat 19 is provided on the side of the cable winding box 3 near the winding motor 4. A drive spindle 20 is provided on one side of the cable winding box 3. The drive spindle 20 passes through two bearings and is inserted into the bearing mounting seat 19. One side of the drive spindle 20 is inserted into the cable winding box 3. A tension winding reel 5 is fitted onto the drive spindle 20. A toggle keyway 21 is provided on the side of the tension winding reel 5 fitted onto the drive spindle 20. A sensor key bar 22 is provided on the side of the drive spindle 20 located in the toggle keyway 21. The sensor key bar 22 is inserted into the toggle keyway 21. Inside the keyway 21, a conductive slip ring 23 is provided on one side of the cable winding box 3. The conductive slip ring 23 is electrically connected to the drive spindle 20 and is used to power the sensing element in the sensing key bar 22. The sensing key bar 22 is provided with a tension sensing module. When the drive spindle 20 drives the tension winding disc 5 to rotate, the sensing module can receive the tension status of the tension winding disc 5. Through high-frequency compression sensing, it can quickly distinguish whether the winding steel rope 6 is in the winding or unwinding state, and then control the winding motor 4 to perform the winding action on the tension winding disc 5.

[0037] Example 2: Based on Example 1, a lubrication assembly is connected to one side of the air source pipe 14. The lubrication assembly is connected to the winding motor 4 to achieve self-lubricating operation of the winding motor 4. The lubrication assembly includes a transfer air pipe 28, an oil storage box 29, and a one-way oil pipe 34. The transfer air pipe 28 is connected to the side of the air source pipe 14 located outside the cable winding box 3. The oil storage box 29 is vertically installed on the side of the cable winding box 3 near the transfer air pipe 28. A combined mounting block 30 is provided at the lower end of the oil storage box 29. The transfer air pipe 28 passes through the combined mounting block 30. A... A side-through transfer air pipe 28 and an oil storage box 29 are provided with an oil replenishment groove 35. A one-way oil pipe 34 is horizontally located on the side of the combined mounting block 30 away from the air source pipe 14. One side of the one-way oil pipe 34 is connected to the three stop blocks 8. The position of the one-way oil pipe 34 connecting to the transfer air pipe 28 is closer to the air source pipe 14 than the oil replenishment groove 35. One side of the oil replenishment groove 35 is connected to the one-way oil pipe 34. After the buffer frame 25 is squeezed into the buffer groove 24 by the stop block 8, the cut-off plate 27 blocks the air source pipe 14. At this time, the high-pressure airflow sent by the air source pipe 14 can enter the transfer air pipe 28.

[0038] A switching piston 31 is horizontally movable inside the transfer air pipe 28, located on one side of the oil replenishment groove 35. A prismatic guide rod 32 is located at the end of the switching piston 31 furthest from the air source pipe 14. The prismatic guide rod 32 passes through the transfer air pipe 28 and is equipped with a constraint block. A return spring 33 is sleeved on one side of the prismatic guide rod 32 inside the transfer air pipe 28. A vertical docking groove 36 is opened on one side of the switching piston 31. Under normal conditions, the docking groove 36 of the switching piston 31 corresponds to the oil replenishment groove 35, and the switching piston 31 blocks the one-way oil pipe 34. When the switching piston 31 moves horizontally to the maximum extent towards the prismatic guide rod 32, the switching piston 31 is misaligned with the one-way oil pipe 34 but still blocks the oil replenishment groove 35. The upper end of the bearing mounting seat 19... An oil mist hose 37 is connected, and one side of the oil mist hose 37 is connected to one end of the one-way oil pipe 34. The airflow entering the transfer air pipe 28 pushes the switching piston 31 to move towards the position of the return spring 33. At this time, under the action of the prismatic guide rod 32 itself, the switching piston 31 will not rotate. At this time, the docking groove 36 and the oil replenishment groove 35 are misaligned, and the transfer air pipe 28 is connected to the one-way oil pipe 34. A one-way valve is provided on the side of the one-way oil pipe 34 near the oil replenishment groove 35. High-pressure airflow enters from the position of the one-way oil pipe 34 and mixes the lubricating oil stored in the one-way oil pipe 34 with high-pressure airflow. Then, it breaks through the one-way valve and is sent from the oil mist hose 37 into the bearing mounting seat 19 to lubricate the two bearings connected to the drive spindle 20.

[0039] Although embodiments of the invention 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 the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A charging pile tension automatic cable rewinding mechanism, characterized in that, include: A charging pile (1) is provided with a top support (2) above it. Cable winding boxes (3) are vertically provided on both sides of the top support (2). A winding motor (4) is provided on one side of each cable winding box (3). A tension winding disc (5) is rotatably provided inside the cable winding box (3). The tension winding disc (5) is connected to the winding motor (4), and a winding steel rope (6) is wound on the tension winding disc (5). The winding control of the winding steel rope (6) by the tension winding disc (5) is realized through the winding motor (4). The protective combing assembly is vertically installed at the lower end of one side of the cable winding box (3). The protective combing assembly includes a processing sleeve (7) and an annular cavity disc (12). The winding steel rope (6) passes through the processing sleeve (7). An air source pipe (14) is provided on one side of the annular cavity disc (12) through the cable winding box (3) and the processing sleeve (7). A lubrication assembly is provided on one side of the air source pipe (14). The lubrication assembly is connected to the winding motor (4) to realize the self-lubricating operation of the winding motor (4) driving the rotation. The lubrication assembly includes a transfer air pipe (28), an oil storage box (29), and a one-way oil pipe (34). The processing sleeve (7) is installed through the lower end of the cable winding box (3). The upper and lower ends of the processing sleeve (7) are horizontally provided with first support frames. Two guide wheels (11) are rotatably provided on the first support frames. The winding steel rope (6) is located between the two guide wheels (11) on one side of the processing sleeve (7). The annular cavity disk (12) is used to receive the wound steel rope (6) on one side inside the processing sleeve (7). The air source pipe (14) is connected to the annular cavity disk (12). The lower end of the annular cavity disk (12) is connected to a number of first air holes (13), and the number of first air holes (13) are inclined to the wound steel rope (6). The processing sleeve (7) is provided with a buffer groove (24) at the lower end outside the cable winding box (3). A buffer frame (25) is inserted into the buffer groove (24). A strip groove (26) is provided on both sides of the processing sleeve (7) near the buffer frame (25). An anti-detachment block is provided through one side of the buffer frame (25) in the strip groove (26). Several downward pressure springs are provided at the upper end of the buffer frame (25) in the buffer groove (24). A cutting groove is vertically connected to the side of the buffer groove (24) near the air source pipe (14). The cutting groove is connected to the air source pipe (14). A cutting plate (27) is vertically provided on one side of the buffer frame (25) in the cutting groove. The width of the cutting plate (27) is greater than the inner diameter of the air source pipe (14).

2. The automatic tension rewinding cable mechanism for charging piles according to claim 1, characterized in that: The processing sleeve (7) is provided with a second support frame horizontally below the annular cavity disk (12). Two brush rollers (15) are rotatably mounted on the second support frame. The brushes on one side of the two brush rollers (15) are in contact with the two sides of the winding steel rope (6). A blowing pipe (16) is connected to the side of the annular cavity disk (12) away from the air source pipe (14). A second air hole (17) is opened through the lower end of the blowing pipe (16). One side of the two brush rollers (15) is connected to the second support frame and a blowing impeller (18) is sleeved on it. The second air hole (17) faces the blades of the two blowing impellers (18).

3. The automatic tension rewinding cable mechanism for charging piles according to claim 2, characterized in that: The lower end of the winding steel rope (6) through the processing sleeve (7) is provided with a stop block (8), and the lower end of the stop block (8) is provided with a cable connection ring (9). When the cutting plate (27) blocks and cuts off the air source pipe (14), the upper end of the stop block (8) squeezes the buffer frame (25) and retracts into the buffer groove (24).

4. The automatic tension rewinding cable mechanism for charging piles according to claim 3, characterized in that: The cable winding box (3) is provided with a bearing mounting seat (19) on the side near the winding motor (4), and a drive spindle (20) is provided on one side of the cable winding box (3). The drive spindle (20) passes through two bearings and is inserted into the bearing mounting seat (19). One side of the drive spindle (20) is inserted into the cable winding box (3). The tension winding reel (5) is sleeved on the drive spindle (20).

5. The automatic tension rewinding cable mechanism for charging piles according to claim 4, characterized in that: The tension winding reel (5) has a toggle keyway (21) on one side of the drive spindle (20). The drive spindle (20) has a sensing key bar (22) on one side of the toggle keyway (21). The sensing key bar (22) is inserted into the toggle keyway (21). A conductive slip ring (23) is provided on one side of the cable winding box (3). The conductive slip ring (23) is electrically connected to the drive spindle (20) and is used to power the sensing element in the sensing key bar (22).

6. The automatic tension rewinding cable mechanism for charging piles according to claim 5, characterized in that: The transfer air pipe (28) is connected to the side of the air source pipe (14) located outside the cable winding box (3). The oil storage box (29) is vertically located on the side of the cable winding box (3) close to the transfer air pipe (28). The lower end of the oil storage box (29) is provided with a combination mounting block (30). The transfer air pipe (28) is set through the combination mounting block (30). The transfer air pipe (28) is connected to the oil storage box (29) on one side of the combination mounting block (30). An oil replenishment groove (35) is opened. The one-way oil pipe (34) is horizontally located on the side of the combination mounting block (30) away from the air source pipe (14). One side of the one-way oil pipe (34) is connected to the stop block (8) of (3). The position of the one-way oil pipe (34) connected to the transfer air pipe (28) is closer to the air source pipe (14) than the oil replenishment groove (35). One side of the oil replenishment groove (35) is connected to the one-way oil pipe (34).

7. The automatic tension rewinding cable mechanism for charging piles according to claim 6, characterized in that: A switching piston (31) is horizontally movable on one side of the oil replenishment tank (35) inside the transfer air pipe (28). A prismatic guide rod (32) is provided at the end of the switching piston (31) away from the air source pipe (14). The prismatic guide rod (32) passes through the transfer air pipe (28) and is provided with a constraint block. A return spring (33) is sleeved on one side of the prismatic guide rod (32) inside the transfer air pipe (28). A docking groove (36) is vertically opened on one side of the switching piston (31). Under normal conditions, the switching piston ( The docking groove (36) of 31) corresponds to the oil replenishment groove (35). The switching piston (31) blocks the one-way oil pipe (34). When the switching piston (31) moves horizontally to the maximum position of the prism guide rod (32), the switching piston (31) and the one-way oil pipe (34) are misaligned but the oil replenishment groove (35) is blocked. The upper end of the bearing mounting seat (19) is connected to an oil mist hose (37), and one side of the oil mist hose (37) is connected to one end of the one-way oil pipe (34).

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