Rotary grinding device for motor punching sheet iron core

Abstract

The invention provides a motor punching sheet iron core rotating and grinding device, and relates to the technical field of motor punching sheet iron core machining, the motor punching sheet iron core rotating and grinding device comprises a conveying assembly and a grinding assembly, the conveying assembly comprises an outer-layer protection fence, a conveying belt is arranged at one end of the outer-layer protection fence, and a conveying area is arranged at the other end of the outer-layer protection fence; an opening is formed in the position, located at the front end of the conveying area, of the outer-layer protection fence, and a limiting stopper is arranged at the position of the opening. According to the iron core polishing device, a limiter is arranged, it is guaranteed that the iron core is stable when being input into the polishing assembly, when a lower arc-shaped plate ascends or descends, a lifting rod can be driven to ascend or descend, then a conveying area is driven to integrally ascend or descend, and at the moment, the central axis of the iron core and the central axis of an adjusting disc are still kept on the same straight line; therefore, the iron core input is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of motor punching core processing, and particularly relates to a rotary grinding device for motor punching cores. Background Art

[0002] The manufacture of core punching sheets is one of the important links in motor manufacturing. The workload of punching sheet manufacturing is the largest, the technical requirements are the strictest, and the requirements for the die are also the highest. It is an important factor affecting economic benefits. Therefore, it is necessary to pay attention to the research on the manufacturing process of core punching sheets and the structure of related dies.

[0003] Before the core enters the grinding assembly for processing, it needs to be conveyed and clamped by a processing fixture. However, due to the different specifications of motor punching cores, the diameters of the cores are also different. When entering the processing fixture, it often requires manual clamping by workers or adjustment of the height of the conveying equipment, which is rather troublesome. Moreover, errors are inevitable during adjustment, and it is easy to damage the conveying equipment due to misalignment of the hole diameters during core conveying. Summary of the Invention

[0004] In order to solve the technical problems in the prior art that it requires manual clamping by workers or adjustment of the height of the conveying equipment, which is rather troublesome, and errors are inevitable during adjustment, and it is easy to damage the conveying equipment due to misalignment of the hole diameters during core conveying, the present invention provides a rotary grinding device for motor punching cores.

[0005] The technical solutions provided by the embodiments of the present invention are as follows: A rotary grinding device for motor punching cores provided by an embodiment of the present invention includes a conveying assembly and a grinding assembly. The conveying assembly includes an outer protective fence. One end of the outer protective fence is provided with a conveyor belt, and the other end of the outer protective fence is provided with a conveying area. An opening is provided at the front end of the outer protective fence where the conveying area is located, and a limiter is arranged at the opening position. A propulsion assembly is arranged at the rear end of the outer protective fence where the conveying area is located, and an adsorption assembly is arranged at the output end of the propulsion assembly. The adsorption assembly is located above the conveying area. The grinding assembly includes a grinding assembly. A driving mechanism is arranged inside the grinding assembly. The grinding assembly further includes a clamping mechanism. The clamping mechanism is coaxial with the limiter and can rotate under the drive of the driving mechanism. A lead screw is arranged between the grinding assembly and the limiter, and a movable moving mechanism is arranged on the lead screw. A detachable grinding block is arranged on one side of the moving mechanism close to the axis of the clamping mechanism.

[0006] Optionally, the limiter includes an adjustment disk which is hollow. Four adjustment slots are provided at the outer edge of the adjustment disk. The adjustment slots are arranged annularly around the axis of the adjustment disk. A slidable moving rod is arranged inside the adjustment slot. One end of the moving rod close to the outer protective fence is fixedly connected with an adjustment rod. The longitudinal adjustment rod can only move vertically, and the transverse adjustment rod can only move horizontally. One end of the adjustment rod close to the center of the adjustment disk is fixedly connected with an arc-shaped plate.

[0007] Optionally, the limiter further includes a first motor which is threadedly installed on the outside of the outer protective fence. The output end of the first motor is fixedly connected with a driving gear. A toothed section is arranged on the outside of the adjustment disk. The adjustment disk is in meshing transmission with the driving gear.

[0008] Optionally, one end of the arc-shaped plate below close to the outer protective fence is fixedly connected with a lifting rod. The lifting rod is located below the conveying area which is made of elastic rubber material.

[0009] Optionally, the propulsion assembly includes a housing. A power adjustment assembly is arranged at one end of the housing away from the outer protective fence. The output end of the power adjustment assembly is connected with a threaded rod which is located inside the housing. A propulsion rod is sleeved on the outside of the threaded rod. A slider is fixedly arranged below one end of the propulsion rod close to the power adjustment assembly. A chute is fixedly arranged on the bottom inner wall of the housing. The chute is fitted with the slider. The adsorption assembly is located at one end of the propulsion rod away from the power adjustment assembly.

[0010] Optionally, the limiter and the propulsion rod are located on the same central axis.

[0011] Optionally, the power adjustment assembly includes a U-shaped plate. Connection blocks are arranged at both ends of the U-shaped plate. A second motor is connected to the middle of the U-shaped plate. The output end of the second motor is fixedly connected with a transverse bevel gear. Longitudinal bevel gears are rotatably arranged at the places where the two connection blocks are close to each other. Both longitudinal bevel gears are meshed with the transverse bevel gear. A rotating shaft is connected inside the connection block through a bearing. The rotating shaft is fixedly connected with the longitudinal bevel gear; One end of the longitudinal bevel gears close to each other is fixedly connected with a control column. The two control columns are in contact with each other. One end of the threaded rod close to the power adjustment assembly is fixedly connected with an insertion rod. The insertion rod passes through the longitudinal bevel gear and inserts into the inside of the control column. One end of the insertion rod away from the threaded rod is fixedly connected with a special-shaped block. A special-shaped groove is arranged inside the control column. The special-shaped grooves inside the two control columns are communicated. The special-shaped block is fitted with the special-shaped groove; A limiting plate is arranged at the connection part of the threaded rod and the insertion rod. A return spring is sleeved on the outside of the insertion rod. Both ends of the return spring are respectively connected with the limiting plate and the connection block close to the limiting plate.

[0012] Optionally, the adsorption component includes an adsorber fixedly connected to the push rod. At one end of the adsorber away from the push rod, several suction cups are provided. An inner cavity is formed inside the adsorber, and the suction cups communicate with the inner cavity. An outer groove is also formed inside the adsorber around the periphery of the inner cavity. Several air outlet holes are formed inside the adsorber perpendicular to the central axis direction of the inner cavity. The air outlet holes penetrate through the inner cavity and the outer groove to communicate with the outside air. An airtight ring fitting with the outer groove is arranged inside the outer groove. An adsorption spring is also arranged inside the outer groove. Two ends of the adsorption spring are respectively connected to the airtight ring and the inner wall of the outer groove.

[0013] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include: (1) A position limiter is provided in the present invention. When the adjustment disk rotates, the moving rod moves inside the adjustment groove. However, due to the limited moving direction of the adjustment rod, it can only move towards or away from the center of the adjustment disk, driving the arc-shaped plate to approach or move away from the center of the adjustment disk, thereby adjusting the size of the hole when the iron core enters the grinding component, and thus adjusting the size of the conveying hole according to the iron core with a cross-sectional radius to ensure the stability when the iron core is input into the grinding component. Moreover, when the lower arc-shaped plate rises or falls, it will drive the lifting rod to rise or fall, and further drive the entire conveying area to rise or fall. At this time, the central axis of the iron core still remains on the same straight line as the central axis of the adjustment disk, thereby ensuring the input of the iron core.

[0014] (2) By setting a power adjustment component in the present invention, when the conveying device is working normally, the power adjustment component drives the push rod to reciprocate repeatedly according to a preset program to push the iron core for processing. However, when the iron core fails to pass through the adjustment disk and contacts surrounding objects due to unexpected situations, the pressure exerted by the push rod on the iron core will damage the conveying device at this time. When the push rod is squeezed, the insertion rod moves, driving the special-shaped block to move. The special-shaped block enters the special-shaped groove inside another control column. At this time, the threaded rod rotates in reverse, and the push rod retracts to prevent the iron core from damaging the conveying device.

[0015] (3) An adsorption component is provided in the present invention. When the iron core is offset and squeezed, the airtight ring will move, thereby blocking the air outlet holes. At this time, the inside of the inner cavity is airtight, and the suction cups can suck the iron core after being squeezed, and then suck the iron core back when the push rod moves back. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of an overall structure provided by an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of a conveying assembly provided by an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the structure of a limiter provided by an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the structure of a propulsion assembly provided by an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the structure of a power adjustment assembly provided by an embodiment of the present invention.

[0022] Figure 6 Cross-sectional view of a longitudinal bevel gear provided by an embodiment of the present invention.

[0023] Figure 7 Schematic diagram of the structure of an adsorption assembly provided by an embodiment of the present invention.

[0024] Figure 8 Cross-sectional view of an adsorber provided by an embodiment of the present invention.

[0025] Explanation of reference numerals: 1, outer protective railing; 2, conveyor belt; 3, conveying area; 4, limiter; 401, adjustment disc; 402, adjustment groove; 403, moving rod; 404, adjustment rod; 405, arc plate; 406, lifting rod; 407, motor 1; 408, driving gear; 5, propulsion assembly; 501, housing; 502, sliding groove; 503, threaded rod; 504, propulsion rod; 505, slider; 506, limiting plate; 507, return spring; 508, insertion rod; 509, special-shaped block; 6, adsorption assembly; 601, adsorber; 602, suction cup; 603, airtight ring; 604, inner cavity; 605, adsorption spring; 606, outer groove; 607, air outlet hole; 7, power adjustment assembly; 701, U-shaped plate; 702, connecting block; 703, motor 2; 704, transverse bevel gear; 705, longitudinal bevel gear; 706, rotating shaft; 707, control column; 708, special-shaped groove; 8, grinding assembly; 801, clamping mechanism; 9, lead screw; 901, moving mechanism; 902, grinding block.

[0026] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0027] The technical solutions in the present invention will be described below in conjunction with the accompanying drawings. It should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0028] As Figures 1 to 8 shown, an embodiment of the present invention provides a rotary grinding device for a motor punching core, which includes a conveying component and a grinding component. The conveying component includes an outer protective fence 1. One end of the outer protective fence 1 is provided with a conveyor belt 2, and the other end of the outer protective fence 1 is provided with a conveying area 3. An opening is provided at the front end of the outer protective fence 1 in the conveying area 3, and a stopper 4 is arranged at the opening position. A propulsion component 5 is arranged at the rear end of the outer protective fence 1 in the conveying area 3, and an adsorption component 6 is arranged at the output end of the propulsion component 5. The adsorption component 6 is located above the conveying area 3. During the conveying process of the motor punching core, the core is first conveyed to the conveying area 3 through the conveyor belt 2, then pushed through the stopper 4 by the propulsion component 5, and then conveyed to the motor punching core grinding component.

[0029] The grinding component includes a grinding component 8. A driving mechanism is arranged inside the grinding component 8. The grinding component 8 further includes a clamping mechanism 801. The clamping mechanism 801 is coaxial with the stopper 4 and can be driven by the driving mechanism to rotate. A lead screw 9 is arranged between the grinding component 8 and the stopper 4. A movable moving mechanism 901 is arranged on the lead screw 9. A detachable grinding block 902 is arranged on one side of the moving mechanism 901 close to the axis of the clamping mechanism 801. The motor punching core is first clamped by the clamping mechanism. The lead screw 9 controls the movement of the moving mechanism 901 until the grinding block contacts the motor punching core, and then the clamping mechanism rotates under the drive of the driving mechanism, while rotating and grinding the motor punching core.

[0030] The stopper 4 includes an adjusting disk 401. The adjusting disk 401 is hollow to facilitate the core to pass through. Four adjusting grooves 402 are arranged on the outer edge of the adjusting disk 401. The adjusting grooves 402 are arc-shaped, and the distances from each part of the arc-shaped groove to the adjusting disk 401 are different. The adjusting grooves 402 are annularly arranged around the central axis of the adjusting disk 401. A slidable moving rod 403 is arranged inside the adjusting grooves 402. One end of the moving rod 403 close to the outer protective fence 1 is fixedly connected with an adjusting rod 404. The longitudinal adjusting rod 404 can only move vertically, and the transverse adjusting rod 404 can only move horizontally. One end of the adjusting rod 404 close to the center of the adjusting disk 401 is fixedly connected with an arc-shaped plate 405.

[0031] When the adjustment disc 401 rotates, the moving rod 403 moves inside the adjustment groove 402. However, due to the restricted moving direction of the adjustment rod 404, it can only move towards or away from the center of the adjustment disc 401, driving the arc-shaped plate 405 to approach or move away from the center of the adjustment disc 401, thereby adjusting the size of the hole when the iron core enters the grinding assembly, and thus adjusting the size of the conveying hole according to the iron core with a transverse radius to ensure the stability when the iron core is input into the grinding assembly.

[0032] The position limiter 4 further includes a first motor 407, which is threadedly installed on the outer side of the outer protective railing 1. The output end of the first motor 407 is fixedly connected with a driving gear 408. The outer side of the adjustment disc 401 is provided with engaging teeth, and the adjustment disc 401 is in meshing transmission with the driving gear 408.

[0033] However, with the change of the iron core size, it is necessary to ensure that the central axis remains unchanged when inputting into the motor punching iron core grinding assembly.

[0034] One end of the lower arc-shaped plate 405 close to the outer protective railing 1 is fixedly connected with a lifting rod 406. The lifting rod 406 is located below the conveying area 3. The conveying area 3 is made of elastic rubber material. When the height of the lifting rod 406 changes, the top height of the conveying area will change accordingly, and the elastic rubber material ensures that the inclination arc between it and the conveyor belt 2 remains connected when its height changes. When the lower arc-shaped plate 405 rises or falls, it will drive the lifting rod 406 to rise or fall, and further drive the whole conveying area 3 to rise or fall. At this time, the central axis of the iron core still remains on the same straight line as the central axis of the adjustment disc 401, thus ensuring the input of the iron core.

[0035] The propulsion assembly 5 includes a housing 501. One end of the housing 501 away from the outer protective railing 1 is provided with a power adjustment assembly 7. The output end of the power adjustment assembly 7 is connected with a threaded rod 503, and the threaded rod 503 is located inside the housing 501. A propulsion rod 504 is threadedly sleeved on the outer side of the threaded rod 503. One end of the propulsion rod 504 close to the power adjustment assembly 7 is fixedly provided with a slider 505 below it. A chute 502 is fixedly provided on the bottom inner wall of the housing 501, and the chute 502 is fitted with the slider 505. The adsorption assembly 6 is located at one end of the propulsion rod 504 away from the power adjustment assembly 7. When the threaded rod 503 rotates, it will drive the propulsion rod 504 to rotate. Also, due to the fitting of the slider 505 and the chute 502, it cannot rotate. Therefore, when the threaded rod 503 rotates, it will drive the propulsion rod 504 to move along the direction of the chute 502.

[0036] The position limiter 4 and the propulsion rod 504 are located on the same central axis.

[0037] The power adjustment assembly 7 includes a U-shaped plate 701. Connecting blocks 702 are arranged at both ends of the U-shaped plate 701. A second motor 703 is connected to the middle of the U-shaped plate 701. A transverse bevel gear 704 is fixedly connected to the output end of the second motor 703. Longitudinal bevel gears 705 are rotatably arranged at the places where the two connecting blocks 702 are close to each other. Both longitudinal bevel gears 705 are engaged with the transverse bevel gear 704. When the transverse bevel gear 704 rotates, the rotation directions of the two longitudinal bevel gears 705 are opposite. A rotating shaft 706 is connected to the inside of the connecting block 702 through a bearing. The rotating shaft 706 is fixedly connected to the longitudinal bevel gear 705; Control columns 707 are fixedly connected to the ends of the longitudinal bevel gears 705 that are close to each other. The two control columns 707 are in contact with each other. A plug rod 508 is fixedly connected to one end of the threaded rod 503 close to the power adjustment assembly 7. The plug rod 508 penetrates through the longitudinal bevel gear 705 and inserts into the inside of the control column 707. A special-shaped block 509 is fixedly connected to the end of the plug rod 508 away from the threaded rod 503. The cross-section of the special-shaped block 509 is a rotationally symmetric figure, and the rotation angle is very small. It can coincide with the original figure by rotating a very small angle. And a special-shaped groove 708 is arranged inside the control column 707. The special-shaped grooves 708 inside the two control columns 707 are communicated. The special-shaped block 509 is fitted with the special-shaped groove 708; When the conveying equipment is working normally, the power adjustment assembly 7 drives the push rod 504 to reciprocate according to a preset program, pushing the iron core for processing. However, when the iron core fails to pass through the adjustment disk 401 and contacts the surrounding objects due to unexpected situations, at this time, the pressure exerted by the push rod 504 on the iron core will damage the conveying equipment. When the push rod 504 is squeezed, the plug rod 508 moves, driving the special-shaped block 509 to move. The special-shaped block 509 enters the special-shaped groove 708 inside another control column 707. At this time, the threaded rod 503 rotates in the reverse direction, and the push rod 504 retracts, preventing the iron core from damaging the conveying equipment.

[0038] A limiting plate 506 is arranged at the connection between the threaded rod 503 and the plug rod 508. A return spring 507 is sleeved on the outside of the plug rod 508. The two ends of the return spring 507 are respectively connected to the limiting plate 506 and the connecting block 702 close to the limiting plate 506.

[0039] The return spring 507 can ensure the normal operation of the equipment after the iron core is taken out.

[0040] The adsorption assembly 6 includes an adsorber 601, which is fixedly connected to the push rod 504. At one end of the adsorber 601 away from the push rod 504, several suction cups 602 are provided. The suction cups 602 are made of rubber and can deform. When the iron core does not move along the established trajectory, its contact with the adsorption assembly 6 will not be parallel contact. An inner cavity 604 is formed inside the adsorber 601, and the suction cups 602 communicate with the inner cavity 604. An outer groove 606 is also formed inside the adsorber 601 around the inner cavity 604. Several air outlet holes 607 are formed inside the adsorber 601 perpendicular to the central axis direction of the inner cavity 604. The air outlet holes 607 penetrate through the inner cavity 604 and the outer groove 606 to communicate with the outside air. An airtight ring 603 that fits with it is arranged inside the outer groove 606. The damping between the airtight ring 603 and the outer groove 606 is relatively large. An adsorption spring 605 is also arranged inside the outer groove 606. Two ends of the adsorption spring 605 are respectively connected to the airtight ring 603 and the inner wall of the outer groove 606.

[0041] When the iron core is offset and squeezed, the airtight ring 603 will move, thus blocking the air outlet holes 607. At this time, the inside of the inner cavity 604 is airtight. After being squeezed, the suction cups 602 can suck the iron core, and then suck the iron core back together when the push rod 504 moves back.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary grinding device for a motor punching core, comprising a conveying component and a grinding component. The conveying component includes an outer protective barrier (1), and is characterized in that: One end of the outer protective fence (1) is provided with a conveyor belt (2), the other end of the outer protective fence (1) is provided with a conveying area (3), an opening is formed at the front end of the outer protective fence (1) located in the conveying area (3), a stopper (4) is arranged at the opening position, a propulsion assembly (5) is arranged at the rear end of the outer protective fence (1) located in the conveying area (3), an adsorption assembly (6) is arranged at the output end of the propulsion assembly (5), and the adsorption assembly (6) is located above the conveying area (3). The grinding assembly includes a grinding assembly (8), a driving mechanism is arranged inside the grinding assembly (8), the grinding assembly (8) further includes a clamping mechanism (801), the clamping mechanism (801) is coaxial with the stopper (4) and can rotate under the drive of the driving mechanism, a lead screw (9) is arranged between the grinding assembly (8) and the stopper (4), a movable moving mechanism (901) is arranged on the lead screw (9), and a detachable grinding block (902) is arranged on one side of the moving mechanism (901) close to the axis of the clamping mechanism (801).

2. The rotary grinding device for the motor punching core according to claim 1, wherein: The stopper (4) includes an adjustment disk (401), the adjustment disk (401) is hollow, 4 adjustment grooves (402) are formed on the outer edge of the adjustment disk (401), the adjustment grooves (402) are arranged annularly around the central axis of the adjustment disk (401), a slidable moving rod (403) is arranged inside the adjustment grooves (402), one end of the moving rod (403) close to the outer protective fence (1) is fixedly connected with an adjustment rod (404), the longitudinal adjustment rod (404) can only move vertically, the transverse adjustment rod (404) can only move horizontally, and one end of the adjustment rod (404) close to the center of the adjustment disk (401) is fixedly connected with an arc-shaped plate (405).

3. The rotating grinding device for the motor punching core according to claim 2, wherein: The stopper (4) further includes a first motor (407), the first motor (407) is threadedly installed on the outside of the outer protective fence (1), the output end of the first motor (407) is fixedly connected with a driving gear (408), a tooth is arranged on the outside of the adjustment disk (401), and the adjustment disk (401) is in meshing transmission with the driving gear (408).

4. A rotary grinding device for a motor punching core according to claim 2, characterized in that: One end of the lower arc-shaped plate (405) close to the outer protective fence (1) is fixedly connected with a lifting rod (406), the lifting rod (406) is located below the conveying area (3), and the conveying area (3) is made of elastic rubber material.

5. A rotary grinding device for a motor punching core according to claim 1, characterized in that: The propulsion assembly (5) includes a housing (501). One end of the housing (501) away from the outer protective barrier (1) is provided with a power adjustment assembly (7). The output end of the power adjustment assembly (7) is connected to a threaded rod (503), and the threaded rod (503) is located inside the housing (501). A propulsion rod (504) is sleeved on the outer side of the threaded rod (503). Below one end of the propulsion rod (504) close to the power adjustment assembly (7), a slider (505) is fixedly arranged. On the bottom inner wall of the housing (501), a chute (502) is fixedly arranged. The chute (502) is engaged with the slider (505). The adsorption assembly (6) is located at one end of the propulsion rod (504) away from the power adjustment assembly (7).

6. The rotary grinding device for the motor punching core according to claim 5, wherein: The position limiter (4) and the propulsion rod (504) are on the same central axis.

7. A rotary grinding device for a motor punching core according to claim 5, characterized in that: The power adjustment assembly (7) includes a U-shaped plate (701). At both ends of the U-shaped plate (701), connection blocks (702) are provided. In the middle of the U-shaped plate (701), a second motor (703) is connected. The output end of the second motor (703) is fixedly connected to a transverse bevel gear (704). At the places where the two connection blocks (702) are close to each other, longitudinal bevel gears (705) are rotatably arranged. Both of the longitudinal bevel gears (705) are engaged with the transverse bevel gear (704). Inside the connection block (702), a rotating shaft (706) is connected by a bearing. The rotating shaft (706) is fixedly connected to the longitudinal bevel gear (705). At one end where the longitudinal bevel gears (705) are close to each other, a control column (707) is fixedly connected. The two control columns (707) are in contact with each other. One end of the threaded rod (503) close to the power adjustment assembly (7) is fixedly connected to an insertion rod (508). The insertion rod (508) passes through the longitudinal bevel gear (705) and inserts into the inside of the control column (707). One end of the insertion rod (508) away from the threaded rod (503) is fixedly connected to a special-shaped block (509). Inside the control column (707), a special-shaped groove (708) is provided, and the special-shaped grooves (708) inside the two control columns (707) are communicated. The special-shaped block (509) is engaged with the special-shaped groove (708). A limiting plate (506) is arranged at the connection part of the threaded rod (503) and the insertion rod (508). A return spring (507) is sleeved on the outer side of the insertion rod (508). Both ends of the return spring (507) are respectively connected to the limiting plate (506) and the connection block (702) close to the limiting plate (506).

8. A rotary grinding device for a motor punching core according to claim 7, characterized in that: The adsorption assembly (6) includes an adsorber (601), the adsorber (601) is fixedly connected to the propulsion rod (504), several suction cups (602) are arranged at one end of the adsorber (601) away from the propulsion rod (504), a cavity (604) is formed inside the adsorber (601), and the suction cups (602) are communicated with the cavity (604). An outer groove (606) is further formed inside the adsorber (601) around the periphery of the cavity (604). Several air outlet holes (607) are formed inside the adsorber (601) perpendicular to the central axis direction of the cavity (604). The air outlet holes (607) penetrate through the cavity (604) and are communicated with the outer groove (606) and the outside air. An airtight ring (603) fitting with the outer groove (606) is arranged inside the outer groove (606). An adsorption spring (605) is further arranged inside the outer groove (606). Two ends of the adsorption spring (605) are respectively connected to the airtight ring (603) and the inner wall of the outer groove (606).

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