Feeding pressing arm for bending center

Abstract

The utility model discloses a feeding pressing arm for a bending center, which relates to the technical field of bending centers and comprises a C-shaped body, and a pushing unit is arranged on the C-shaped body. The pushing unit comprises a base, a rotation driving device is arranged at one end of the base, a sliding rail is arranged in the base, a synchronous belt is arranged at the output end of the rotation driving device, a connecting base is connected to the synchronous belt, a supporting plate is arranged on the connecting base, at least one guide hole is formed in the supporting plate in the length direction parallel to the sliding rail, and a first guide rod is arranged in the guide hole. One end of the first guide rod is provided with a push plate, the guide rod is sleeved with an elastic piece between the push plate and the supporting plate, the top of the push plate is provided with an induction piece, the supporting plate is provided with a mounting plate on the opposite face of the induction piece, and the mounting plate is provided with a first proximity switch; according to the plate pushing device, the purpose that plates are pushed through the pushing plate is achieved, meanwhile, the plates are effectively protected, and deformation and damage of the plates are prevented.

Description

Technical Field

[0001] This utility model relates to the field of bending center technology, and in particular to a feeding pressure arm for bending centers. Background Technology

[0002] The bending center integrates feeding, conveying, and bending functions on the basis of the original bending machine, which improves the automation of sheet metal bending and enhances bending efficiency and quality.

[0003] The existing utility model patent with announcement number CN 112893527 A and announcement date of June 4, 2021, discloses an integral structure of a flexible bending center pressure arm, including a C-shaped pressure arm, a sliding mechanism under the C-shaped pressure arm, a pressing mechanism connected to the free end above the C-shaped pressure arm, the pressing mechanism including a first driving unit, a first transmission mechanism and a pressure shaft, and a pressure bearing mechanism connected to the free end below the C-shaped pressure arm, the pressure bearing mechanism including a second driving unit, a pressure bearing shaft, a pressure bearing plate, a pressure bearing seat and a rotating base block, wherein the pressure bearing seat is fixedly connected to the C-shaped pressure arm, the rotating base block is rotatably connected to the pressure bearing seat through a bearing, and the pressure bearing shaft is fixedly connected to the rotating base block;

[0004] In this invention, the rotating base block can support a large-diameter pressure shaft, ensuring high structural strength and improving equipment lifespan and processing stability. The first transmission mechanism is also equipped with a follow-up third drive unit, which can transmit rotational motion to the pressure shaft so that the pressure shaft and the pressure plate rotate synchronously, ensuring high positional accuracy of the plate. In addition, a positioning mechanism is also provided to facilitate workers in loading and positioning the material.

[0005] However, this invention exposes a significant problem during the feeding process: during feeding, the rodless cylinder 41 drives the positioning block 43 to abut against the rear end of the plate, and then the plate is fed between the pressure shaft 23 and the pressure plate. Then, the C-shaped pressure arm slides as a whole to achieve the feeding and bending of the plate. During this process, the C-shaped pressure arm needs to cooperate with the feeding platform, which is equipped with positioning posts. When the positioning block 43 pushes the plate forward and abuts against the positioning posts, the positioning posts position the plate left and right. Then, the pressure shaft and the pressure plate clamp the plate. However, the existing problem is that after the plate is positioned by the positioning posts, the rodless cylinder continues to provide forward driving force to the positioning block 43, causing the plate to be deformed by edge squeezing or the plate to buckle upwards in the middle under the action of the positioning blocks. As a result, the plate cannot be protected during the feeding process, leading to deformation and edge damage.

[0006] Therefore, there is an urgent need for a feeding pressure arm for the bending center, which can effectively protect the sheet material during the feeding process and prevent deformation and damage to the edges.

[0007] Proximity switches are available in three-wire and two-wire configurations. Three-wire switches include PNP and NPN types. The three wires of a three-wire proximity switch are colored brown, blue, and black. In use, brown is connected to the positive power supply, blue to the negative power supply, and black to the load. For the PNP type, this creates a "switch contact" between the positive power supply and the black wire; for the NPN type, it creates a "switch contact" between the negative power supply and the black wire. Utility Model Content

[0008] To address the aforementioned technical problems, this utility model provides a feeding pressure arm for bending centers. This solves the problem that in existing pressure arms, after the sheet metal is positioned by the positioning column during the feeding process, the rodless cylinder continues to provide forward driving force to the positioning block, causing the sheet metal to be deformed at the edges or buckled upwards in the middle under the action of the positioning block. Consequently, the plate metal cannot be protected during the feeding process, resulting in deformation and edge damage.

[0009] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0010] A feeding pressure arm for a bending center includes a C-shaped body with a feeding port. A clamping unit is provided at one end of the C-shaped body near the feeding port. The clamping unit includes an upper pressure rod and a lower pressure rod arranged opposite to each other. The upper pressure rod is equipped with a drive mechanism for pressing down. A pressure head is provided at one end of the upper pressure rod near the lower pressure rod. A pressure plate is provided at one end of the lower pressure rod corresponding to the pressure head. A pushing unit is provided inside the feeding port of the C-shaped body.

[0011] The pushing unit includes a base. A rotary drive device is provided at one end of the base away from the clamping unit. A groove is formed along the length of the base, and a slide rail is provided in the groove. A synchronous belt is provided at the output end of the rotary drive device in the groove. A connecting seat is connected to the synchronous belt. A support plate is provided on the connecting seat. At least one guide hole is formed on the support plate parallel to the length of the slide rail. A first guide rod is provided in the guide hole. A push plate is provided at one end of the first guide rod. An elastic element is fitted between the push plate and the support plate. A sensing plate is provided on the top of the push plate. A mounting plate is provided on the opposite side of the support plate. A first proximity switch is provided on the mounting plate. The first proximity switch is used to detect the distance between itself and the sensing plate to control the start and stop of the rotary drive device.

[0012] Furthermore, the first proximity switch is provided with an adjustment mechanism via a mounting plate for adjusting the distance between itself and the sensing element.

[0013] Furthermore, the adjustment mechanism includes a base, on which a lead screw is rotatably mounted, and a slider is threaded onto the lead screw. The slider is connected to a mounting plate, and second guide rods are provided at both ends of the slider. The two ends of the second guide rods are connected to the base.

[0014] Furthermore, the end of the first guide rod away from the push plate is provided with a limiting member to prevent the first guide rod from disengaging from the guide hole.

[0015] Furthermore, the limiting member is a limiting ring welded to one end of the first guide rod, and the outer diameter of the limiting ring is larger than the inner diameter of the guide hole.

[0016] Furthermore, the limiting member is a limiting bolt threaded to one end of the first guide rod, and the outer diameter of the nut of the limiting bolt is larger than the inner diameter of the guide hole.

[0017] Furthermore, the limiting component is a limiting bolt threaded to one end of the first guide rod, and a limiting ring is fitted on the screw of the limiting bolt.

[0018] Furthermore, a wooden pad is glued to one side of the push plate.

[0019] Furthermore, one end of the lead screw is provided with a hexagonal drive head.

[0020] Furthermore, the rotation drive device includes a motor and a gearbox connected to the motor. The motor is connected to a control system, which includes a first contactor, a second contactor, a first intermediate relay, a second intermediate relay, a stop button, a forward rotation button, a reverse rotation button, a first proximity switch, and a second proximity switch. The first proximity switch and the second proximity switch are normally closed.

[0021] The normally open main contacts of the first contactor are used to control the on / off of the power supply for the motor in forward rotation, and the normally open main contacts of the second contactor are used to control the on / off of the power supply for the motor in reverse rotation.

[0022] The first intermediate relay includes a first coil, a first normally open contact, a first normally closed contact, and a third normally open contact;

[0023] The second intermediate relay includes a second coil, a second normally open contact, a second normally closed contact, and a fourth normally open contact;

[0024] The third normally open contact is connected in series in the power supply circuit of the first contactor coil to control the on / off of the power supply to the first contactor coil.

[0025] The fourth normally open contact is connected in series in the power supply circuit of the second contactor coil to control the on / off state of the power supply to the second contactor coil.

[0026] The forward rotation button, the normally closed contact of the first proximity switch, the first coil, and the second normally closed contact are connected in series in the control power supply, and the first normally open contact is connected in parallel with the forward rotation button.

[0027] The reversing button, the normally closed contact of the second proximity switch, the second coil, and the first normally closed contact are connected in series in the control power supply, and the second normally open contact is connected in parallel with the reversing button.

[0028] The stop button can be used to cut off the control power supply.

[0029] In summary, the beneficial technical effects of this utility model are as follows:

[0030] A pusher plate is used to abut against the rear end of the sheet material. A rotating drive device, driven by a synchronous belt, pushes the sheet material forward. During this pushing process, the other end of the sheet material is clamped between the pressure head and the pressure plate. At this point, the sheet material acts in the opposite direction to the pusher plate, reducing the distance between it and the support plate. When the first proximity switch detects that the distance between them has reached a set distance, it controls the rotating drive device to stop working. This avoids the rotating drive device continuously using the pusher plate to act on the sheet material, preventing the sheet material from buckling and being damaged by edge compression. An adjustment mechanism allows the first proximity switch to move back and forth relative to the sensing element, enabling adaptive adjustments when pushing sheet materials of different thicknesses. When pushing thin sheet materials, the first proximity switch can be moved forward, allowing the pusher plate to move backward by a small amount to reach the detected distance value. This reduces the reaction force of the elastic element on the sheet material, thus protecting the edges. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the feeding unit;

[0033] Figure 3 yes Figure 2 Enlarged schematic diagram of part A;

[0034] Figure 4 yes Figure 3 A diagram from another angle;

[0035] Figure 5 This is a schematic diagram of the control circuit connection of the feeding unit.

[0036] Reference numerals: 1. C-shaped body; 2. Feed port; 3. Upper pressure rod; 4. Pressure head; 5. Lower pressure rod; 6. Pressure plate; 7. First rotary motor; 8. First slide; 9. Connecting rod; 10. Second slide; 11. Pressing motor; 12. Second rotary motor; 13. Base; 14. Rotation drive device; 15. Slide groove; 16. Synchronous belt; 17. Connecting seat; 18. Mounting seat; 19. Support plate; 20. First guide rod; 21. Push plate; 22. Elastic element; 23. Induction plate; 24. 25. Mounting plate; 26. First proximity switch; 27. Base; 28. Lead screw; 29. ​​Slider; 30. Second guide rod; 31. Limit bolt; 32. Limit ring; 33. Hexagonal drive head; 34. Wooden pad; 35. Support frame; 36. Stop button; 37. Forward button; 38. Reverse button; 39. First coil; 40. First normally open contact; 41. Second coil; 42. Second normally open contact; 43. Second normally closed contact; 44. Second proximity switch. Detailed Implementation

[0037] The present invention will now be described clearly and completely with reference to the embodiments.

[0038] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0039] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] See appendix Figure 1-5As shown, a feeding pressure arm for a bending center includes a C-shaped body 1, wherein a feeding port 2 is provided on the C-shaped body 1, and an upper pressure rod 3 and a lower pressure rod 5 are respectively installed opposite each other at the discharge end of the feeding port 2 on the C-shaped body 1. A pressure head 4 is provided at one end of the upper pressure rod 3 near the lower pressure rod 5, and a pressure plate 6 is provided at the opposite end of the lower pressure rod 5 opposite the pressure head 4. A first slide 8 is provided at the other end of the upper pressure rod 3, and a connecting rod 9 is hinged to one end of the first slide 8. A second slide 10 is provided at the other end of the connecting rod 9. A pressure motor 11 is connected to the second slide 10 through a lead screw, and the lead screw is controlled to rotate by the pressure motor 11 during use. The second slide block 10 is pressed down by the linkage rod 9 under the action of the lead screw 27. The linkage rod 9 further drives the upper pressure rod 3 and the pressure head 4 to move closer to the pressure plate 6 through the first slide block 8 to clamp the plate. At the same time, the C-shaped body 1 is equipped with a first rotary motor 7 at the position of the upper pressure rod 3. The first rotary motor 7 is linked with the upper pressure rod 3 by a belt. Meanwhile, the lower pressure rod 5 is equipped with a second rotary motor 12. The first rotary motor 7 and the second rotary motor 12 rotate synchronously. When it is necessary to adjust the direction of the plate during bending, the first rotary motor 7 and the second rotary motor 12 can drive the pressure head 4 and the pressure plate 6 respectively to rotate the plate.

[0041] The C-type body 1 is equipped with a pushing unit inside the feeding port 2. The pushing unit includes a base 13 arranged along the moving direction of the sheet material. A rotary drive device 14 is installed at one end of the base 13. A slide groove 15 is opened along the length direction of the base 13. A slide rail is laid at the bottom of the slide groove 15. At the same time, a synchronous belt 16 is provided at the output end of the rotary drive device 14 inside the slide groove 15. A connecting seat 17 is connected to the synchronous belt 16. The bottom of the connecting seat 17 cooperates with the slide rail. The connecting seat 17 slides along the slide rail under the drive of the rotary drive device 14. A motor is connected to a reduction gearbox as the rotary drive device. The reduction gearbox is a self-locking type (it self-locks after the motor stops rotating, for example, some reduction gearboxes equipped with worm gear mechanisms have this function). During the control process, the start, stop, forward and reverse rotation of the corresponding rotary drive device can be controlled by controlling the start, stop, forward and reverse rotation of the motor. The motor is connected to the control system.

[0042] Furthermore, a mounting base 18 is bolted to the top of the connecting base 17. A support plate 19 is vertically mounted on the mounting base 18. The support plate 19 has four rectangular guide holes, each containing a first guide rod 20. The ends of the four first guide rods 20 furthest from the support plate 19 are connected to a push plate 21. An elastic element 22, specifically a compression spring, is fitted between the first guide rods 20 and the push plate 21 and the support plate 19. The elastic element 22 provides an elastic force to the push plate 21. A sensing plate 23 is mounted on the top of the push plate 21. Meanwhile, a mounting plate 24 is mounted on the opposite side of the sensing plate 23 on the support plate 19. A first proximity switch 25 is mounted on the mounting plate 24. During feeding, the push plate 21 abuts against the rear end of the material. Then, the rotary drive device 14 provides a forward thrust to the push plate 21 through the synchronous belt 16, pushing the plate between the upper pressure rod 3 and the lower pressure rod 5, and using the pressure head 4 and the pressure plate 6 to clamp the plate. At this time, the plate will exert a backward force on the push plate 21. When the push plate 21 is subjected to this force, it will move backward. During the movement, when the first proximity switch 25 detects that the distance between it and the sensing plate 23 has reached the set distance, it will control the rotary drive device 14 to stop pushing the material. At this time, the force exerted by the push plate 21 on the plate reaches a fixed value, which not only pushes the plate forward, but also avoids the continuous force exerted by the rotary drive device 14 on the plate, causing the edge of the plate in contact with the push plate 21 to be squeezed and deformed, effectively protecting the plate.

[0043] In addition, to accommodate the pushing of plates of different thicknesses, the first proximity switch 25 is equipped with an adjustment mechanism via the mounting plate 24 for adjusting the distance between itself and the sensing plate 23. The adjustment mechanism includes a base 26, on which a lead screw 27 is rotatably mounted. One end of the lead screw 27 has a hexagonal drive head 32, which is used to rotate the lead screw 27 with a hexagonal wrench. A slider 28 is threaded onto the lead screw 27 and connected to the mounting plate 24. Second guide rods 29 are located at both ends of the slider 28, and both ends of the second guide rods 29 are connected to the base 26. In use, when pushing thin plates, the hexagonal drive head 32 can be used to adjust the distance between the first proximity switch 25 and the sensing plate 23. The proximity switch 25 moves forward, reducing the distance between the first proximity switch 25 and the sensing plate 23. Thus, after the push plate 21 is subjected to the force of the plate, the push plate 21 only needs to move backward a small distance to reach the set detection distance. The distance the push plate 21 moves backward determines the magnitude of the force exerted by the elastic element 22 on the push plate 21. In other words, the smaller the distance the push plate 21 moves, the smaller the force exerted on the elastic element 22. At the same time, the smaller the force exerted by the push plate 21 on the thin plate, the thin plate can be pushed without deforming under this force. Conversely, when pushing a thicker plate, the distance between the first proximity switch 25 and the sensing plate 23 can be increased.

[0044] Furthermore, in order to reduce the rigidity when the push plate 21 comes into contact with the board, a wooden pad 33 is glued to one side of the push plate 21, which can effectively protect the board.

[0045] In use, the push plate 21 is moved to the inner end of the feeding port 2 by rotating the drive device 14. The push plate 21 abuts against the rear end of the material. Then, the drive device 14 provides a forward thrust to the push plate 21 through the synchronous belt 16, pushing the material between the upper pressure rod 3 and the lower pressure rod 5. The pressure head 4 and the pressure plate 6 are used to clamp the material. At this time, the material will exert a backward force on the push plate 21. When the push plate 21 is subjected to this force, it will move backward. During the movement, when the first proximity switch 25 detects that the distance between it and the sensing plate 23 has reached the set distance, it will control the drive device 14 to stop pushing the material.

[0046] It should be noted that, see appendix Figure 1 The C-shaped body 1 shown has multiple support frames 34 symmetrically installed on both sides of the base 13, with the push plate 21 higher than the support frames 34. During material feeding, a feeding platform is also laid on both sides of the C-shaped body 1 through the support frames 34. The feeding platform increases the contact area with the material. The material is placed on the feeding platform and pushed forward by the push plate 21. Ball bearings are installed on the feeding platform to reduce the friction of the material movement. A positioning column is set at the front end of the feeding platform. This positioning column can be raised and lowered. When raised, it can reach above the feeding platform to stop and position the material; when lowered, it can be lowered to a height that does not affect the further forward movement of the material.

[0047] like Figure 5As shown, the control system includes a first contactor, a second contactor, a first intermediate relay, a second intermediate relay, a stop button 35, a forward rotation button 36, a reverse rotation button 37, a first proximity switch 25, and a second proximity switch 44. Both the first proximity switch 25 and the second proximity switch 44 are normally closed. The normally open main contact of the first contactor controls the on / off of the power supply to the motor during forward rotation, and the normally open main contact of the second contactor controls the on / off of the power supply to the motor during reverse rotation. The first intermediate relay includes a first coil 38, a first normally open contact 39, a first normally closed contact 41, and a third normally open contact; the second intermediate relay includes a second coil 41, a second normally open contact 42, a second normally closed contact 43, and a fourth normally open contact. The third normally open contact is connected in series in the power supply circuit of the first contactor's coil to control the on / off of the power supply to the first contactor's coil. The fourth normally open contact is connected in series in the power supply circuit of the second contactor's coil to control the on / off of the power supply to the second contactor's coil. The forward button 36, the normally closed contact of the first proximity switch 25, the first coil 38, and the second normally closed contact 43 are connected in series in the control power supply, and the first normally open contact 39 is connected in parallel with the forward button 36. The reverse button 37, the normally closed contact of the second proximity switch 44, the second coil 41, and the first normally closed contact 41 are connected in series in the control power supply, and the second normally open contact 42 is connected in parallel with the reverse button 37; the stop button 35 can be used to cut off the control power supply. Both the first proximity switch 25 and the second proximity switch 44 are three-wire PNP type. After pressing the forward button 36, the first coil 38 is energized, the first normally open contact 39 self-locks, the third normally open contact closes, the coil of the first contactor is energized, the motor forward rotation power supply is connected, the motor rotates forward, and in turn drives the rotation drive device to rotate forward, thus pushing the plate to the positioning post; after the positioning post stops the plate, the push plate 21 is pushed further back until it triggers the first proximity switch 25; after the first proximity switch 25 is triggered, the power supply to the first coil 38 is disconnected, the power supply to the motor is also disconnected, and the motor stops. When it is necessary to reset the push plate, press the reverse button 37, then the second coil 41 is energized, and at the same time the second normally open contact 42 closes to form a self-locking mechanism, the fourth normally open contact closes, and the coil of the second contactor is energized, thus the motor reverses power supply until the second proximity switch 44 is triggered and the motor stops.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape and principle of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A feeding pressure arm for a bending center, comprising a C-shaped body (1), wherein a feeding port (2) is provided on the C-shaped body (1), and a clamping unit is provided at one end of the C-shaped body (1) near the feeding port (2), the clamping unit comprising an upper pressure rod (3) and a lower pressure rod (5) arranged opposite to each other, the upper pressure rod (3) being equipped with a driving mechanism for moving the lower pressure rod (5), a pressure head (4) being provided at one end of the upper pressure rod (3) near the lower pressure rod (5), and a pressure plate (6) being provided at one end of the lower pressure rod (5) corresponding to the pressure head (4), characterized in that: The C-type body (1) is equipped with a pushing unit inside the feeding port (2); The feeding unit includes a base (13), and a rotation drive device (14) is provided at one end of the base (13) away from the clamping unit. The base (13) has a groove (15) along its length, and a slide rail is provided in the groove (15). The output end of the rotation drive device (14) is located in the groove (15) and a synchronous belt (16) is provided. A connecting seat (17) is connected to the synchronous belt (16), and a support plate (19) is provided on the connecting seat (17). At least one guide hole is provided on the support plate (19) parallel to the length direction of the slide rail. A first guide rod (20) is provided inside the hole. A push plate (21) is provided at one end of the first guide rod (20). An elastic element (22) is fitted between the push plate (21) and the support plate (19). A sensing plate (23) is provided on the top of the push plate (21). A mounting plate (24) is provided on the opposite side of the support plate (19) to the sensing plate (23). A first proximity switch (25) is provided on the mounting plate (24). The first proximity switch (25) is used to detect the distance between itself and the sensing plate (23) to control the start and stop of the rotation drive device (14).

2. The feeding pressure arm for a bending center according to claim 1, characterized in that: The first proximity switch (25) is provided with an adjustment mechanism via a mounting plate (24) for adjusting the distance between itself and the sensing plate (23).

3. A feeding pressure arm for a bending center according to claim 2, characterized in that: The adjustment mechanism includes a base (26), on which a lead screw (27) is rotatably mounted, and a slider (28) is threadedly mounted on the lead screw (27). The slider (28) is connected to the mounting plate (24), and a second guide rod (29) is provided at both ends of the slider (28). The two ends of the second guide rod (29) are connected to the base (26).

4. The feeding pressure arm for a bending center according to claim 1, characterized in that: The end of the first guide rod (20) away from the push plate (21) is provided with a limiting member to prevent the first guide rod (20) from disengaging from the guide hole.

5. A feeding pressure arm for a bending center according to claim 4, characterized in that: The limiting component is a limiting ring (31) welded to one end of the first guide rod (20), and the outer diameter of the limiting ring (31) is larger than the inner diameter of the guide hole.

6. A feeding pressure arm for a bending center according to claim 4, characterized in that: The limiting component is a limiting bolt (30) threadedly connected to one end of the first guide rod (20), and the outer diameter of the nut of the limiting bolt (30) is larger than the inner diameter of the guide hole.

7. A feeding pressure arm for a bending center according to claim 4, characterized in that: The limiting component is a limiting bolt (30) threaded to one end of the first guide rod (20), and a limiting ring (31) is fitted on the screw of the limiting bolt (30).

8. A feeding pressure arm for a bending center according to claim 1, characterized in that: A wooden pad (33) is glued to one side of the push plate (21).

9. A feeding pressure arm for a bending center according to claim 3, characterized in that: One end of the lead screw (27) is provided with a hexagonal drive head (32).

10. A feeding pressure arm for a bending center according to claim 1, characterized in that, The rotation drive device (14) includes a motor and a gearbox connected to the motor. The motor is connected to the control system. The control system includes a first contactor, a second contactor, a first intermediate relay, a second intermediate relay, a stop button (35), a forward rotation button (36), a reverse rotation button (37), a first proximity switch (25), and a second proximity switch (44). The first proximity switch (25) and the second proximity switch (44) are normally closed. The normally open main contacts of the first contactor are used to control the on / off of the power supply for the motor in forward rotation, and the normally open main contacts of the second contactor are used to control the on / off of the power supply for the motor in reverse rotation. The first intermediate relay includes a first coil (38), a first normally open contact (39), a first normally closed contact (40), and a third normally open contact; The second intermediate relay includes a second coil (41), a second normally open contact (42), a second normally closed contact (43), and a fourth normally open contact; The third normally open contact is connected in series in the power supply circuit of the first contactor coil to control the on / off of the power supply to the first contactor coil. The fourth normally open contact is connected in series in the power supply circuit of the second contactor coil to control the on / off state of the power supply to the second contactor coil. The forward rotation button (36), the normally closed contact of the first proximity switch (25), the first coil (38), and the second normally closed contact (43) are connected in series in the control power supply, and the first normally open contact (39) is connected in parallel with the forward rotation button (36). The normally closed contact of the reverse button (37), the second proximity switch (44), the second coil (41), and the first normally closed contact (40) are connected in series in the control power supply, and the second normally open contact (42) is connected in parallel with the reverse button (37). The stop button (35) can be used to cut off the control power supply.

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