Engine crankshaft center hole machining device

Abstract

The invention relates to the technical field of crankshaft center hole machining, and discloses an engine crankshaft center hole machining device which comprises a machining base table, a limiting mechanism is movably connected to the center of the top end of the machining base table, and positioning mechanisms are fixedly connected to the two sides of the top end of the limiting mechanism. A placing mechanism is fixedly connected to the center of the top end of the machining base table, a crankshaft assembly is placed at the top end of the placing mechanism, and the crankshaft assembly is located in the positioning mechanism; by arranging the adjusting wheel, the output bevel gear, the transmission bevel gear and the limiting plate, the adjusting wheel is rotated before a center hole is drilled, the output bevel gear is driven to rotate through the output shaft when the adjusting wheel rotates, the rotating shaft is driven to rotate through the transmission bevel gear when the output bevel gear rotates, and then the rotating sleeve and the limiting plate rotate; at the moment, the angle between the two limiting plates is changed, the balance block can be supported, the crankshaft assembly placed in the limiting plates can be preliminarily and accurately positioned, and follow-up rapid and accurate positioning is facilitated.

Description

Technical Field

[0001] This invention relates to the field of crankshaft center hole machining technology, and more specifically to an engine crankshaft center hole machining apparatus. Background Technology

[0002] The engine is hailed as the "heart" of industry, and the crankshaft is one of the key core components of the engine. The function of the crankshaft is to convert the reciprocating linear motion of the piston into rotational motion and output power to the transmission system. During high-speed rotation, the crankshaft is subjected to complex and varied periodic alternating loads, including bending stress, torsional stress and impact loads. Its manufacturing quality directly determines the engine's performance, reliability, stability and service life. In the entire crankshaft machining process chain, the machining of the center hole is the first and most crucial step. The center hole serves as the unified positioning datum for all subsequent turning, grinding, and milling processes. Its machining quality directly determines the core accuracy indicators of all critical crankshaft journals, such as coaxiality, roundness, and radial runout. Therefore, the center hole is the datum for the entire crankshaft machining process. If there is any deviation in the center hole, all subsequent finishing processes will accumulate and amplify this error, leading to the scrapping of the entire crankshaft and causing huge economic losses. Nowadays, when machining crankshafts, it is necessary to position the crankshaft. Because the crankshaft itself is relatively heavy, when positioning the crankshaft, it is necessary to first place the crankshaft on the side of the chuck, slowly move the crankshaft to the appropriate position, and then perform the precise positioning work of the crankshaft. Therefore, it is not possible to quickly rough position the crankshaft, thus reducing its overall machining efficiency. When positioning the crankshaft, it needs to be adjusted by rotating the chuck. The overall adjustment process is very slow. When machining the crankshaft after positioning, when drilling the center hole on the side of the crankshaft, there is a possibility that the crankshaft may move horizontally when it is subjected to force on the side. If the crankshaft moves, it will affect its machining accuracy. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide an engine crankshaft center hole machining apparatus to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a machining device for the center hole of an engine crankshaft, comprising a machining base, characterized in that: a limiting mechanism is movably connected to the center of the top of the machining base; positioning mechanisms are fixedly connected to both sides of the top of the limiting mechanism; a placement mechanism is fixedly connected to the center of the top of the machining base; a crankshaft assembly is placed on the top of the placement mechanism; the crankshaft assembly is located within the positioning mechanism; the placement mechanism supports the crankshaft assembly; the limiting mechanism horizontally limits the crankshaft assembly; and the positioning mechanism radially limits the crankshaft assembly.

[0005] In one preferred embodiment, the two sides of the top end of the processing base are fixedly connected with grinding assemblies, the side surfaces of the grinding assemblies are movably connected with drilling assemblies, and the grinding assemblies and the drilling assemblies can respectively polish and drill the two sides of the crankshaft assembly.

[0006] The placing mechanism comprises an adjustable wheel capable of rotating, the side surface of the adjustable wheel is fixedly connected with an output shaft, the two ends of the output shaft are fixedly connected with output bevel gears, the side surfaces of the two output bevel gears away from each other are engaged with transmission bevel gears, the side surfaces of the transmission bevel gears away from the output bevel gears are fixedly connected with rotating shafts, the side surfaces of the rotating shafts are fixedly connected with rotating sleeves, the top end of the rotating sleeve is fixedly connected with a connecting plate, and the top end of the connecting plate is fixedly connected with a limiting plate.

[0007] In one preferred embodiment, the crankshaft assembly comprises a central shaft journal located at the center, the two sides of the central shaft journal are fixedly connected with balance blocks, the side surfaces of the balance blocks away from the central shaft journal are fixedly connected with side shaft journals, the side surfaces of the side shaft journals away from the balance blocks are fixedly connected with cranks, the interiors of the cranks are fixedly connected with connecting rod journals, one side of the crank away from the side shaft journal is fixedly connected with a crankshaft front end, and the other side of the crank away from the side shaft journal is fixedly connected with a crankshaft rear end.

[0008] In one preferred embodiment, the side surfaces of the rotating shafts and the output shafts are movably connected with support plates, the bottom end of the support plate is fixedly connected with the top end of the processing base, and the side surface of the limiting plate is in contact with the side surface of the balance block in the crankshaft assembly.

[0009] In one preferred embodiment, the limiting mechanism comprises a servo motor providing power, the side surface of the servo motor is fixedly connected with a bidirectional screw rod, the two sides of the bidirectional screw rod are provided with mirror-symmetrical threaded grooves, the threaded grooves of the bidirectional screw rod are threadedly connected with moving plates, and the top end of each moving plate is fixedly connected with a sliding plate.

[0010] In one preferred embodiment, the top end of the sliding plate is fixedly connected with the bottom end of the positioning mechanism, and when the crankshaft assembly is placed above the placing mechanism, the positioning mechanism is located between the balance block and the crank.

[0011] In one preferred embodiment, the positioning mechanism comprises a support ring supporting and limiting, the interior of the support ring is provided with three equiangularly distributed limiting grooves, the limiting grooves of the support ring are movably connected with positioning plates, the top end of the support ring is provided with an avoiding channel through which the crankshaft assembly passes, the side surface of the positioning plate away from the support ring is fixedly connected with a magnetic plate, the interior of the magnetic plate is movably connected with a limiting rod, and the bottom end of the limiting rod is fixedly connected with an electromagnet.

[0012] In a preferred embodiment, the magnetic plate is movably connected with the side surface of the electromagnet through a fixing box, the magnetic plate and the electromagnet are located in the fixing box, and the magnetic plate can move in the fixing box, a support column is fixedly connected with the side surface of the support ring close to the fixing box, and the side surface of the support column away from the fixing box is fixedly connected with the side surface of the support ring.

[0013] Technical effects and advantages of the present application: 1、The present application is provided with an adjusting wheel, an output bevel gear, a transmission bevel gear and a limiting plate, before drilling the center hole, the adjusting wheel is rotated, the output shaft drives the output bevel gear to rotate when the adjusting wheel rotates, the transmission bevel gear drives the rotating shaft to rotate when the output bevel gear rotates, and then the rotating sleeve and the limiting plate are rotated, at this time, the angle between the two limiting plates changes, the balance block can be supported, the crankshaft assembly placed in the limiting plate can be preliminarily and accurately positioned, and subsequent rapid and accurate positioning is facilitated. 2、After the crankshaft assembly is placed above the placing mechanism, the two positioning mechanisms are located between the balance block and the crank on one side, at this time, the servo motor is started, the servo motor drives the bidirectional screw to rotate after being started, the two moving plates move away from each other when the bidirectional screw rotates, and then the two positioning mechanisms move away from each other, the two positioning mechanisms contact the crank, at this time, when the center hole is drilled, the positioning mechanism supports the crank, and horizontal movement of the crankshaft assembly is avoided when the center hole is drilled. 3、The present application is provided with a magnetic plate, an electromagnet, a positioning plate and a support ring, after the position of the crankshaft assembly is preliminarily positioned, the electromagnet is forwardly electrified, and repulsion is generated between the electromagnet and the magnetic plate, under the action of the repulsion, the magnetic plate drives the positioning plate to move away from the electromagnet, at this time, the three positioning plates move away from the electromagnet synchronously, and then the three positioning plates move towards the center of the support ring synchronously, the side journal is accurately positioned, and the crankshaft assembly is automatically and rapidly accurately positioned. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the present application.

[0015] Figure 2 It is a crankshaft assembly and placing mechanism connection structure schematic view of the present application.

[0016] Figure 3 It is a crankshaft assembly and placing mechanism exploded structure schematic view of the present application.

[0017] Figure 4 It is a crankshaft assembly structure schematic view of the present application.

[0018] Figure 5 It is a placing mechanism structure schematic view of the present application.

[0019] Figure 6 It is a schematic diagram of the limiting mechanism structure of the application.

[0020] Figure 7 It is a schematic diagram of the overall structure of the positioning mechanism of the application.

[0021] Figure 8 It is a schematic diagram of the exploded structure of the positioning mechanism of the application.

[0022] The figure marks are: 1, machining base; 2, grinding assembly; 3, drilling assembly; 4, crankshaft assembly; 401, center journal; 402, balance block; 403, side journal; 404, crank; 405, connecting rod journal; 406, crankshaft front end; 407, crankshaft rear end; 5, placing mechanism; 501, adjusting wheel; 502, output shaft; 503, output bevel gear; 504, transmission bevel gear; 505, rotating shaft; 506, rotating sleeve; 507, connecting plate; 508, limiting plate; 509, supporting plate; 6, limiting mechanism; 601, servo motor; 602, bidirectional screw rod; 603, moving plate; 604, sliding plate; 7, positioning mechanism; 701, supporting ring; 702, supporting column; 703, fixed box; 704, positioning plate; 705, magnetic plate; 706, limiting rod; 707, electromagnet. DETAILED DESCRIPTION

[0023] The technical solutions in the application will be described clearly and completely below in combination with the drawings in the application, and in addition, the forms of each structure described in the following embodiments are only examples, and the engine crankshaft center hole machining device involved in the application is not limited to each structure described in the following embodiments, and all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0024] With reference to Figure 1 , Figure 2 and Figure 3 , the application provides an engine crankshaft center hole machining device, which comprises a machining base 1, a limiting mechanism 6 movably connected to the center of the top end of the machining base 1, positioning mechanisms 7 fixedly connected to the two sides of the top end of the limiting mechanism 6, a placing mechanism 5 fixedly connected to the center of the top end of the machining base 1, a crankshaft assembly 4 placed on the top end of the placing mechanism 5, the crankshaft assembly 4 being located in the positioning mechanism 7, grinding assemblies 2 fixedly connected to the two sides of the top end of the machining base 1, drilling assemblies 3 movably connected to the sides of the grinding assemblies 2, and the grinding assemblies 2 and the drilling assemblies 3 being capable of respectively polishing and drilling the two sides of the crankshaft assembly 4.

[0025] In the embodiment of the present application, the grinding assembly 2 and the drilling assembly 3 can grind and drill the two sides of the crankshaft assembly 4 respectively, so that the center hole machining work can be performed on the two ends of the crankshaft assembly 4 at the same time, thereby improving the machining efficiency of the crankshaft assembly 4.

[0026] With reference to Figure 4 , the crankshaft assembly 4 comprises a center journal 401 at the center, and balance blocks 402 are fixedly connected to the two sides of the center journal 401, side journals 403 are fixedly connected to the sides of the balance blocks 402 away from the center journal 401, cranks 404 are fixedly connected to the sides of the side journals 403 away from the balance blocks 402, connecting rod journals 405 are fixedly connected to the interiors of the cranks 404, a crankshaft front end 406 is fixedly connected to the side of one side crank 404 away from the side journal 403, and a crankshaft rear end 407 is fixedly connected to the side of the other side crank 404 away from the side journal 403.

[0027] In the embodiment of the present application, the crankshaft is composed of the center journal 401, the balance blocks 402, the side journals 403, the cranks 404, the connecting rod journals 405, the crankshaft front end 406 and the crankshaft rear end 407, and the center hole machining work needs to be performed on the crankshaft front end 406 and the crankshaft rear end 407. The present application simultaneously performs the center hole machining work on the crankshaft front end 406 and the crankshaft rear end 407, improves the machining efficiency, and does not need to rotate the crankshaft assembly 4 as a whole, so that positioning is not needed twice, and the machining precision is ensured.

[0028] With reference to Figure 1 , Figure 4 and Figure 5 , the placing mechanism 5 comprises an adjusting wheel 501 which can rotate, an output shaft 502 is fixedly connected to the side of the adjusting wheel 501, output bevel gears 503 are fixedly connected to the two ends of the output shaft 502, transmission bevel gears 504 are engaged with the sides of the two output bevel gears 503 away from each other, rotating shafts 505 are fixedly connected to the sides of each transmission bevel gear 504 away from the output bevel gear 503, rotating sleeves 506 are fixedly connected to the sides of the rotating shafts 505, a connecting plate 507 is fixedly connected to the top end of the rotating sleeve 506, a limiting plate 508 is fixedly connected to the top end of the connecting plate 507, support plates 509 are movably connected to the sides of the rotating shafts 505 and the output shaft 502, the bottom end of the support plate 509 is fixedly connected to the top end of the machining base 1, and the side of the limiting plate 508 is in contact with the side of the balance block 402 in the crankshaft assembly 4.

[0029] In the embodiment of the application, when the adjusting wheel 501 rotates, the output shaft 502 is driven to rotate the output bevel gear 503, the output bevel gear 503 is driven to rotate the rotating shaft 505 through the transmission bevel gear 504, and then the rotating sleeve 506 and the limiting plate 508 are rotated, at this time, the angle between the two limiting plates 508 changes, different types of balance blocks 402 can be supported, at this time, the crankshaft assembly 4 placed in the limiting plate 508 is preliminarily and accurately positioned, which is convenient for subsequent rapid and accurate positioning, and the support plate 509 can be supported to stabilize the work of the output shaft 502 and the rotating shaft 505.

[0030] Referring to Figure 3 With Figure 6 , the limiting mechanism 6 includes a powered servo motor 601, the side surface of the servo motor 601 is fixedly connected with a bidirectional screw rod 602, mirror-symmetrical screw grooves are formed on the two sides of the bidirectional screw rod 602, and a moving plate 603 is threadedly connected in each screw groove of the bidirectional screw rod 602. The top end of each moving plate 603 is fixedly connected with a sliding plate 604, the top end of the sliding plate 604 is fixedly connected with the bottom end of the positioning mechanism 7, and when the crankshaft assembly 4 is placed above the placing mechanism 5, the positioning mechanism 7 is located between the balance block 402 and the crank 404.

[0031] In the embodiment of the application, the two positioning mechanisms 7 of the application are respectively located between the balance block 402 and the crank 404 on one side. When the servo motor 601 drives the bidirectional screw rod 602 to rotate, the mirror-symmetrical screw grooves formed on the two sides of the bidirectional screw rod 602 will make the two moving plates 603 move away from each other, and then make the two positioning mechanisms 7 move away from each other. The two positioning mechanisms 7 are in contact with the crank 404, at this time, when the center hole is drilled, the positioning mechanism 7 supports the crank 404, so that the crankshaft assembly 4 does not move horizontally when the center hole is drilled.

[0032] Referring to Figure 7 With Figure 8 , the positioning mechanism 7 includes a support ring 701 for supporting and limiting, three equiangular limiting grooves are formed in the inside of the support ring 701, a positioning plate 704 is movably connected in each limiting groove of the support ring 701, a bypass channel through which the crankshaft assembly 4 passes is formed in the top end of the support ring 701, a magnetic plate 705 is fixedly connected to the side of the positioning plate 704 away from the support ring 701, a limiting rod 706 is movably connected in the inside of the magnetic plate 705, an electromagnet 707 is fixedly connected to the bottom end of the limiting rod 706, a fixed box 703 is movably connected to the side surfaces of the magnetic plate 705 and the electromagnet 707, the magnetic plate 705 and the electromagnet 707 are located in the fixed box 703, the magnetic plate 705 can move in the fixed box 703, a support column 702 is fixedly connected to the side of the fixed box 703 close to the support ring 701, and the side of the support column 702 away from the fixed box 703 is fixedly connected with the side of the support ring 701.

[0033] In the embodiment of the application, the top end of the support ring 701 is provided with a position avoiding channel through which the crankshaft assembly 4 passes, so as to facilitate the feeding and discharging of the crankshaft assembly 4. The three equi-angle distributed limiting grooves are movably connected with the positioning plates 704, so that when the electromagnet 707 is forward energized and the magnetic repulsion force is generated between the electromagnet 707 and the magnetic plate 705, the three positioning plates 704 synchronously move away from the electromagnet 707, at this time, the three positioning plates 704 synchronously move towards the center of the support ring 701, so as to accurately position the side journal 403. The application can automatically and quickly accurately position the crankshaft assembly 4.

[0034] The working principle of the application is as follows: before processing, the adjusting wheel 501 is rotated, the adjusting wheel 501 drives the output shaft 502 to rotate when rotating, the output shaft 502 drives the two output bevel gears 503 on the side thereof to rotate when rotating, the two output bevel gears 503 synchronously drive the transmission bevel gear 504 to rotate when rotating, the transmission bevel gear 504 drives the rotating sleeve 506 to rotate through the rotating shaft 505 when rotating, the rotating sleeve 506 drives the limiting plates 508 to rotate through the connecting plates 507 when rotating, so as to adjust the angle between the two limiting plates 508, so that the angle is adapted to the angle of the side of the balance block 402. When the placing mechanism 5 is adjusted, the crankshaft assembly 4 is placed in the limiting plates 508 as a whole, the balance block 402 contacts the limiting plates 508 when the crankshaft assembly 4 is placed, the two positioning mechanisms 7 are respectively located between the balance block 402 and the crank 404 on each side, and the side journal 403 passes through the position avoiding channel above the support ring 701 and is located at the center position of the support ring 701. After the crankshaft assembly 4 is placed, the servo motor 601 is started and drives the bidirectional screw 602 to rotate, the bidirectional screw 602 drives the two moving plates 603 to synchronously move away or synchronously move towards when rotating, the moving plates 603 drive the positioning mechanisms 7 to move as a whole through the sliding plates 604 when moving, the positioning mechanisms 7 synchronously move away from the balance block 402 and the crank 404, so as to make the two positioning mechanisms 7 respectively contact and limit the crank 404. When the limiting mechanism 6 is adjusted, the electromagnet 707 is forward energized and the magnetic repulsion force is generated between the electromagnet 707 and the magnetic plate 705, under the action of the magnetic repulsion force, the magnetic plate 705 moves away from the electromagnet 707, the magnetic plate 705 drives the positioning plates 704 to move when moving, at this time, the three positioning plates 704 synchronously move towards the center of the support ring 701, so as to clamp and fix the side journal 403 at the center of the support ring 701, at this time, the position of the side journal 403 can be accurately fixed, so as to fix the position of the crankshaft assembly 4. When the position of the crankshaft assembly 4 is fixed, the grinding assembly 2 moves to the side surface of the crankshaft front end 406 and the crankshaft rear end 407 to grind the crankshaft front end 406 and the crankshaft rear end 407, after grinding, the drilling assembly 3 moves to the surface of the crankshaft front end 406 and the crankshaft rear end 407 after grinding, drills a center hole, can synchronously process the center hole of the crankshaft front end 406 and the crankshaft rear end 407, improves work efficiency, and when the crankshaft front end 406 and the crankshaft rear end 407 horizontally move during processing, 8 is in contact with the crank 404 and supports the crank 404, ensures that the horizontal position of the crankshaft assembly 4 does not change, after processing, the electromagnet 707 is reversely electrified, the positioning plate 704 is away from the side journal 403, the servo motor 601 controls the bidirectional screw rod 602 to reverse, at this time the positioning mechanism 7 is located between the balance block 402 and the crank 404, the processed crankshaft assembly 4 can be quickly taken out and put into a new crankshaft assembly 4.

[0035] Finally: the above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An engine crankshaft center hole machining device comprising a machining base (1), characterized in that: The top end of the machining base (1) is movably connected with a limiting mechanism (6), both sides of the top end of the limiting mechanism (6) are fixedly connected with a positioning mechanism (7), the top end of the machining base (1) is fixedly connected with a placing mechanism (5), the top end of the placing mechanism (5) is placed with a crankshaft assembly (4), the crankshaft assembly (4) is located in the positioning mechanism (7), the placing mechanism (5) supports the crankshaft assembly (4), the limiting mechanism (6) horizontally fixes and limits the crankshaft assembly (4), the positioning mechanism (7) radially fixes and limits the crankshaft assembly (4), both sides of the top end of the machining base (1) are fixedly connected with a grinding assembly (2), the side surface of the grinding assembly (2) is movably connected with a drilling assembly (3), the grinding assembly (2) and the drilling assembly (3) can respectively polish and drill the two sides of the crankshaft assembly (4).

2. An engine crankshaft center bore machining apparatus as set forth in claim 1, characterized by: The crankshaft assembly (4) comprises a central shaft journal (401) located at the center, balance blocks (402) fixedly connected to the two sides of the central shaft journal (401), side shaft journals (403) fixedly connected to the side surfaces of the balance blocks (402) away from the central shaft journal (401), and cranks (404) fixedly connected to the side surfaces of the side shaft journals (403) away from the balance blocks (402).

3. An engine crankshaft center bore machining apparatus as set forth in claim 2 wherein: The inside of the crank (404) is fixedly connected with a connecting rod shaft journal (405), a crankshaft front end (406) is fixedly connected to the side surface of one side of the crank (404) away from the side shaft journal (403), and a crankshaft rear end (407) is fixedly connected to the side surface of the other side of the crank (404) away from the side shaft journal (403).

4. The apparatus of claim 1 wherein: The placing mechanism (5) comprises an adjusting wheel (501) capable of rotating, an output shaft (502) fixedly connected to the side surface of the adjusting wheel (501), output bevel gears (503) fixedly connected to the two ends of the output shaft (502), transmission bevel gears (504) meshed with the side surfaces of the two output bevel gears (503) away from each other, rotating shafts (505) fixedly connected to the side surfaces of each transmission bevel gear (504) away from the output bevel gear (503), rotating sleeves (506) fixedly connected to the side surfaces of the rotating shafts (505), connecting plates (507) fixedly connected to the top ends of the rotating sleeves (506), and limiting plates (508) fixedly connected to the top ends of the connecting plates (507).

5. An engine crankshaft center bore machining apparatus as defined in claim 4, wherein: The side surfaces of the output shaft (502) and the rotating shaft (505) are movably connected with supporting plates (509), the bottom ends of the supporting plates (509) are fixedly connected with the top end of the machining base (1), and the side surface of the limiting plate (508) is in contact with the side surface of the balance block (402) in the crankshaft assembly (4).

6. An engine crankshaft center bore machining apparatus as defined in claim 1, wherein: The limiting mechanism (6) includes a powered servo motor (601), the side of the servo motor (601) is fixedly connected with a bidirectional screw rod (602), mirror-symmetrical screw grooves are formed in the two sides of the bidirectional screw rod (602), a moving plate (603) is threadedly connected in the screw groove of the bidirectional screw rod (602), and the top end of each moving plate (603) is fixedly connected with a sliding plate (604).

7. An engine crankshaft center bore machining apparatus as defined in claim 6 wherein: The top end of the sliding plate (604) is fixedly connected with the bottom end of a positioning mechanism (7), and when the crankshaft assembly (4) is placed above the placing mechanism (5), the positioning mechanism (7) is located between the balance block (402) and the crank (404).

8. An engine crankshaft center bore machining apparatus as defined in claim 1, wherein: The positioning mechanism (7) includes a supporting ring (701) for supporting and limiting, three equiangular limiting grooves are formed in the inside of the supporting ring (701), a positioning plate (704) is movably connected in the limiting groove of the supporting ring (701), and a avoiding channel through which the crankshaft assembly (4) passes is formed in the top end of the supporting ring (701).

9. An engine crankshaft center bore machining apparatus as defined in claim 8, wherein: The side, away from the supporting ring (701), of the positioning plate (704) is fixedly connected with a magnetic plate (705), the inside of the magnetic plate (705) is movably connected with a limiting rod (706), and the bottom end of the limiting rod (706) is fixedly connected with an electromagnet (707).

10. An engine crankshaft center bore machining apparatus as defined in claim 9, wherein: The side of the magnetic plate (705) and the electromagnet (707) is movably connected with a fixing box (703), the magnetic plate (705) and the electromagnet (707) are located in the fixing box (703), the magnetic plate (705) can move in the fixing box (703), the side, close to the supporting ring (701), of the fixing box (703) is fixedly connected with a supporting column (702), and the side, away from the fixing box (703), of the supporting column (702) is fixedly connected with the side of the supporting ring (701).

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