Iron shaft turner

Abstract

The utility model relates to an iron shaft turner, and relates to the technical field of enameled wire production auxiliary equipment, the iron shaft turner comprises a fixing frame, an electric hoist is installed on the lower side of the fixing frame, and an electromagnet is hoisted on a lifting hook of the electric hoist. According to the trolley, through the arrangement of the iron shaft turner, the iron shaft can be directly turned over on the ground, then the iron shaft is attracted through the electromagnet, and then the iron shaft can be slowly placed on the trolley, so that the impact on the trolley can be reduced, and the service life of the trolley is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of auxiliary equipment for enameled wire production, and in particular to an iron shaft turner. Background Art

[0002] At present, when producing enameled wire, it is necessary to wind the metal wire as the processing raw material onto the iron shaft to form an iron shaft coil, and then move the iron shaft to the corresponding trolley, and then use the trolley to move the iron shaft wrapped with the metal wire to the corresponding position. Finally, the iron shaft can be unwound to realize the subsequent processing of the metal wire.

[0003] At present, the method of moving the iron shaft to the trolley is: stand the iron shaft vertically on the ground, then roll the iron shaft on the ground to the corresponding upper side of the trolley, and then use auxiliary tools such as crowbars to align the central inner hole of the iron shaft with the clamping shaft position on the trolley, and finally flip the iron shaft so that the iron shaft can be placed flat on the corresponding trolley. At the same time, the iron shaft can also be aligned and plugged with the clamping shaft position on the trolley, which is convenient for the subsequent iron shaft laying operation.

[0004] However, the iron shaft is heavy, generally 50 kg to 150 kg, and needs to be turned over and aligned with the shaft position when placed on the trolley, which causes the trolley to be subjected to a large impact force, and thus is easily damaged. Utility Model Content

[0005] The present application provides an iron shaft turner, the purpose of which is to reduce the impact of the iron shaft on the trolley when the iron shaft is installed on the trolley, reduce the possibility of damage to the trolley, and increase the service life of the trolley.

[0006] The present application provides an iron shaft flipper adopting the following technical solution:

[0007] An iron shaft turner comprises a fixing frame, an electric hoist is installed on the lower side of the fixing frame, and an electromagnet is hoisted on the hook of the electric hoist.

[0008] By adopting the above technical solution, an auxiliary device capable of transporting an iron shaft is formed by a fixed frame, an electric hoist and an electromagnet.

[0009] Specifically, when the iron shaft needs to be installed on the trolley, the iron shaft is rolled onto the rubber protective pad on the lower side of the electromagnet, and then the iron shaft is laid flat; on this basis, the electric hoist drives the electromagnet to descend, so that the electromagnet absorbs the iron shaft, and then the iron shaft is lifted up by the electric hoist, and the trolley is moved to the lower side of the iron shaft. At this time, the central inner hole of the iron shaft is vertically aligned with the clamping position on the trolley, and then the electromagnet is slowly lowered by the electric hoist, so that the iron shaft can be slowly installed on the trolley.

[0010] Therefore, the iron shaft is directly turned over on the ground and then slowly placed on the trolley, which can reduce the impact on the trolley and increase the service life of the trolley.

[0011] Optionally, the electromagnet is provided with a plurality of anti-falling components, and the plurality of anti-falling components are arranged around the electromagnet along the circumference of the electromagnet;

[0012] The anti-falling assembly comprises an extension rod and an anti-falling plate, wherein the extension rod is arranged in a vertical direction, the upper end of the extension rod is connected to the electromagnet, the lower end of the extension rod is connected to the anti-falling plate, the anti-falling plate is arranged in a horizontal direction, the anti-falling plate is rotatably connected to the extension rod, and one end of the anti-falling plate along its own length direction is extended in the direction of the electromagnet;

[0013] A reset driving member for driving the anti-falling plate to rotate is arranged between the anti-falling plate and the extension rod.

[0014] By adopting the above technical solution, firstly, a plurality of anti-fall components are arranged in the circumference of the electromagnet, and the anti-fall components include an extension rod and an anti-fall plate, one end of the extension rod is connected to the electromagnet, and the other end is connected to the anti-fall plate, and one end of the anti-fall plate in the length direction is extended toward the direction of the electromagnet.

[0015] Therefore, when the electromagnet attracts the iron shaft, the anti-drop plate is located at the lower side of the iron shaft, so that when the electromagnet is powered off, the anti-drop plate can withstand the impact of the iron shaft. Therefore, through the cooperation of multiple anti-drop components, when the iron shaft falls from the electromagnet, the anti-drop plate can support the iron shaft and prevent the iron shaft from falling directly to the ground or the trolley, thereby causing unnecessary casualties, which can improve the safety of the device.

[0016] The anti-fall plate is rotatably connected to the extension rod and is also provided with a reset drive. Therefore, when the electromagnet attracts the iron shaft, the anti-fall plate is rotated in the vertical direction by the reset drive. At this time, there is no interference between the iron shaft and the anti-fall plate, so that the iron shaft can be attracted by the electromagnet and the iron shaft can also fall off the electromagnet. When anti-fall is needed, the anti-fall plate is rotated to the horizontal by the reset drive. At this time, the anti-fall plate will be able to support the fallen iron shaft, thereby realizing the anti-fall function.

[0017] Optionally, a support plate is provided at the lower end of the extension rod, the support plate is arranged in a horizontal direction, and the anti-fall plate is arranged on the upper side of the support plate;

[0018] One end of the anti-falling plate close to the electromagnet extends beyond one end of the supporting plate close to the electromagnet.

[0019] By adopting the above technical solution, the support plate is arranged on the lower side of the extension rod, so that the support plate can increase the strength of the anti-falling plate, and when the iron shaft falls, the support plate can support the anti-falling plate. The end of the anti-falling plate close to the electromagnet extends beyond the end of the support plate close to the electromagnet, so that only the anti-falling plate has the anti-falling function, preventing the support plate from interfering with the iron shaft.

[0020] Optionally, a return spring is provided on the extension rod, and two ends of the return spring are respectively connected to the extension rod and the anti-fall plate.

[0021] By adopting the above technical solution and setting the reset spring, after the anti-fall plate rotates, the reset spring will automatically reset the anti-fall plate so that the anti-fall plate returns to a horizontal state, so that the normal position of the anti-fall plate has an anti-fall function for the iron shaft.

[0022] Optionally, the anti-fall plate is rotatably connected to the extension rod along the middle part of its own length direction; the return spring is located on the side of the extension rod away from the electromagnet, and one end of the return spring is connected to the extension rod, and the other end of the return spring is connected to the end of the anti-fall plate away from the electromagnet.

[0023] By adopting the above technical solution, since the reset spring is arranged on the side of the extension rod away from the electromagnet, in order to allow the reset spring to be connected to the anti-fall plate, the middle part of the anti-fall plate is rotatably connected to the extension rod, so that a part of the anti-fall plate along its own length direction is located on the side of the extension rod away from the electromagnet, which provides an installation position for the reset spring.

[0024] The return spring is arranged on the side of the extension rod away from the electromagnet, thereby preventing the iron shaft from directly impacting the return spring when it falls.

[0025] Optionally, the reset drive member is located on a side of the extension rod away from the electromagnet, and one end of the reset drive member is rotatably connected to the extension rod, and the other end of the reset drive member is rotatably connected to an end of the anti-fall plate away from the electromagnet.

[0026] By adopting the above technical solution, the reset driving member is arranged on the side of the extension rod away from the electromagnet, thereby preventing the iron shaft from directly impacting the reset driving member when it falls.

[0027] Optionally, it further comprises a mounting plate, the electromagnet is mounted on the mounting plate, and the electric hoist hoists the mounting plate;

[0028] The upper end of the extension rod is provided with an adjusting driving member for driving the extension rod to move towards or away from the electromagnet;

[0029] The adjusting drive member is arranged on the mounting plate.

[0030] By adopting the above technical solution, the installation plate can be used to install the electromagnet and several anti-falling components. The setting of the adjusting driving member can adjust the distance between the extension rod and the electromagnet, and then change the size of the space surrounded by the several extension rods, so that the space can accommodate iron shafts of different sizes, so that the anti-falling component of the present application can prevent iron shafts of different sizes from falling.

[0031] Optionally, the adjusting drive member includes a mounting seat, which is connected to the mounting plate, a driving screw is arranged in the mounting seat, the axial direction of the driving screw is arranged along the length direction of the anti-fall plate, the driving screw is connected to the extension rod by a thread, and one end of the driving screw is coaxially connected to a driving handwheel, the driving handwheel is located on the side of the mounting seat away from the electromagnet, and the driving handwheel is located on the outside of the mounting seat.

[0032] By adopting the above technical solution, the adjusting drive component includes a mounting seat, a driving screw and a driving handwheel. The mounting seat is installed on the mounting plate, and the driving screw is connected to the extension rod by a thread, and the driving handwheel is coaxially connected to the driving screw. Therefore, when the driving screw is driven to rotate by the driving handwheel, the driving screw can drive the extension rod to move along its own axial direction, thereby satisfying the driving function of the adjusting drive component on the extension rod.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] 1. The present application can slowly place the iron shaft on the trolley through the iron shaft turner, which can reduce the impact on the trolley and increase the service life of the trolley.

[0035] 2. This application uses the anti-fall component to protect the iron shaft from falling after the electromagnet absorbs the iron shaft, thereby preventing the iron shaft from falling from the electromagnet and causing unnecessary casualties, thereby improving the safety of the use of this equipment.

[0036] 3. This application adjusts the setting of the driving member so that the anti-fall component can provide anti-fall protection for iron shafts of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the iron shaft flipper of Example 1 of the present application.

[0038] Figure 2 It is a schematic diagram of the overall structure of the iron shaft flipper of Example 2 of the present application.

[0039] Figure 3 It is a schematic diagram of the overall structure of the anti-fall assembly of Example 2 of the present application.

[0040] Figure 4It is a schematic diagram of the cross-sectional structure of the adjustment drive component of Example 2 of the present application.

[0041] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure of part A.

[0042] In the figure, 1, fixing bracket; 2, electric hoist; 3, electromagnet; 4, mounting plate; 5, anti-fall assembly; 51, extension rod; 511, make way hole; 512, rotating seat; 513, support groove; 514, isolation cavity; 515, isolation hole; 52, anti-fall plate; 521, rotating shaft; 53, support plate; 54, reset spring; 55, reset drive member; 56, adjustment drive member; 561, mounting seat; 562, drive screw; 563, drive hand wheel; 564, support rod; 565, connecting seat; 566, threaded hole; 567, isolation spring. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0044] Embodiment 1:

[0045] An iron shaft turner, referring to Figure 1 , including a fixing frame 1, the fixing frame 1 adopts a triangular structure, and one side of the fixing frame 1 is fixed to the wall. An electric hoist 2 is installed on the lower side of the fixing frame 1, and an electromagnet 3 is installed on the hook of the electric hoist 2.

[0046] The implementation principle of the embodiment of the present application is: when the iron shaft needs to be installed on the trolley, the iron shaft is rolled onto the rubber protective pad on the lower side of the electromagnet 3, and then the iron shaft is laid flat; on this basis, the electric hoist 2 drives the electromagnet 3 to descend, so that the electromagnet 3 absorbs the iron shaft, and then the iron shaft is lifted up by the electric hoist 2, and the trolley is moved to the lower side of the iron shaft. At this time, the central inner hole of the iron shaft is aligned with the clamping position of the trolley in the vertical direction, and then the electromagnet 3 is slowly lowered by the electric hoist 2, so that the iron shaft can be slowly installed on the trolley.

[0047] Embodiment 2:

[0048] An iron shaft flipper, referring to Figure 2 The difference between this embodiment and embodiment 1 is that a mounting plate 4 is provided between the electromagnet 3 and the hook of the electric hoist 2, the electromagnet 3 is fixed to the lower side of the mounting plate 4, and the upper side of the mounting plate 4 is connected to the hook of the electric hoist 2.

[0049] Reference Figure 2, a plurality of anti-falling components 5 are arranged on the lower side of the mounting plate 4, and the plurality of anti-falling components 5 are arranged around the electromagnet 3 along the circumference of the electromagnet 3. In this embodiment, four anti-falling components 5 are arranged, and the specific number is set according to actual needs.

[0050] Reference Figure 2 and Figure 3 The anti-falling assembly 5 includes an extension rod 51, which is arranged in the vertical direction, the upper end of which is connected to the mounting plate 4, and the lower end of which is provided with an anti-falling plate 52, which is arranged in the horizontal direction, and the length direction of the anti-falling plate 52 is arranged perpendicular to the extension rod 51. Therefore, when the iron shaft absorbed by the electromagnet 3 falls, the iron shaft will impact the anti-falling plate 52, thereby realizing the anti-falling function of the iron shaft.

[0051] Reference Figure 3 A support plate 53 is disposed at the lower end of the extension rod 51. The support plate 53 is located on the side of the extension rod 51 facing the electromagnet 3. The support plate 53 is disposed in the horizontal direction, and one end of the support plate 53 is fixedly connected to the extension rod 51. The anti-falling plate 52 is disposed on the support plate 53. And the end of the anti-falling plate 52 close to the electromagnet 3 in the length direction extends beyond the end of the support plate 53 close to the electromagnet 3.

[0052] Therefore, the setting of the support plate 53 can, on the one hand, limit the rotation angle of the anti-falling plate 52, so that the normal state of the anti-falling plate 52 is horizontal, thereby having an anti-falling function. On the other hand, the support plate 53 can also increase the strength of the anti-falling plate 52, ensuring that the anti-falling plate 52 can support the impact when the iron shaft falls.

[0053] Reference Figure 2 and Figure 3 A clearance hole 511 is provided on the side of the extension rod 51 facing the electromagnet 3, and the clearance hole 511 penetrates the extension rod 51, and the anti-fall plate 52 is plugged and matched with the clearance hole 511 along its length direction. A rotating seat 512 is provided on the side of the extension rod 51 away from the electromagnet 3, and a rotating shaft 521 is provided on the anti-fall plate 52. The rotating shaft 521 is located in the middle of the anti-fall plate 52 along the length direction of the anti-fall plate 52, and the axial direction of the rotating shaft 521 is arranged along the width direction of the anti-fall plate 52. The rotating shaft 521 is plugged and matched with the rotating seat 512, and the rotating shaft 521 is rotatably connected with the rotating seat 512, so that the anti-fall plate 52 can rotate relative to the extension rod 51 through the cooperation between the rotating seat 512 and the rotating shaft 521.

[0054] Due to the setting of the rotating connection, the anti-falling plate 52 can rotate, and then when the electromagnet 3 absorbs the iron shaft, the anti-falling plate 52 rotates to a non-horizontal state, that is, the electromagnet 3 can absorb the iron shaft. When the anti-falling plate 52 is needed to prevent falling, the anti-falling plate 52 is rotated to a horizontal state, and when the iron shaft falls, the iron shaft will impact on the anti-falling plate 52, thereby meeting the anti-falling requirement.

[0055] Reference Figure 2 and Figure 3 A return spring 54 is also provided on the side of the extension rod 51 away from the electromagnet 3. The return spring 54 is located on the upper side of the anti-fall plate 52, and one end of the return spring 54 is connected to the extension rod 51, and the other end is connected to the end of the anti-fall plate 52 away from the electromagnet 3 along its own length direction.

[0056] When the electromagnet 3 descends to absorb the iron shaft, the anti-falling plate 52 will be pushed open by the iron shaft when it contacts the iron shaft, so that the iron shaft can be absorbed by the electromagnet 3. After the electromagnet 3 absorbs the iron shaft, the anti-falling plate 52 will automatically reset under the action of the reset spring 54, so that the anti-falling plate 52 is in a horizontal state, so that the anti-falling plate 52 can prevent falling at this time.

[0057] Reference Figure 2 and Figure 3 , a reset drive member 55 is also provided on the side of the extension rod 51 away from the electromagnet 3. The reset drive member 55 adopts a cylinder or a hydraulic cylinder or a linear push rod. One end of the reset drive member 55 is connected to the extension rod 51, and the other end is connected to the end of the anti-falling plate 52 away from the electromagnet 3 along its own length direction. In this embodiment, two reset drive members 55 are provided, and the two reset drive members 55 are arranged on both sides of the anti-falling plate 52 along the width direction of the anti-falling plate 52. Therefore, the reset drive member 55 is arranged, and when the iron shaft needs to be installed on the corresponding trolley after the electromagnet 3 absorbs the iron shaft, the reset drive member 55 can rotate the anti-falling plate 52 at this time, thereby ensuring that the iron shaft can be installed on the corresponding trolley.

[0058] Reference Figure 3 and Figure 4 An adjusting drive member 56 is arranged between the upper end of the extension rod 51 and the mounting plate 4, and the adjusting drive member 56 includes a mounting seat 561, and the length direction of the mounting seat 561 is arranged along the length direction of the anti-fall plate 52, and a driving screw rod 562 is installed in the mounting seat 561, and the axial direction of the driving screw rod 562 is arranged along the length direction of the mounting seat 561. The upper end of the extension rod 51 is connected to the driving screw rod 562 through a thread, and a driving hand wheel 563 is coaxially installed at one end of the driving screw rod 562. The driving hand wheel 563 is located on the side of the mounting seat 561 away from the electromagnet 3, and the driving hand wheel 563 is located on the outside of the mounting seat 561.

[0059] When the driving hand wheel 563 is turned, the driving screw rod 562 cooperates with the extension rod 51 , so that the extension rod 51 can be driven to move in a direction close to or away from the electromagnet 3 .

[0060] Therefore, by cooperating with a plurality of anti-falling components 5, the size of the space between the plurality of extension rods 51 for accommodating the iron shaft can be adjusted, thereby enabling the iron shaft flipper to be used for flipping assistance of iron shafts of different sizes.

[0061] Reference Figure 3 and Figure 4 The extension rod 51 is provided with support grooves 513 on both sides along the width direction thereof, and the support grooves 513 penetrate the extension rod 51 along the axial direction of the driving screw rod 562. Two support rods 564 are arranged at the lower side of the mounting seat 561, and the two support rods 564 are arranged at intervals along the width direction of the extension rod 51, and the length direction of the support rods 564 is arranged along the length direction of the mounting seat 561, and the two support rods 564 are fixedly connected to the mounting seat 561. The support rods 564 are arranged in a one-to-one correspondence with the support grooves 513, and the support rods 564 are plugged and matched with the corresponding support grooves 513, and the support rods 564 are slidably connected with the inner wall of the corresponding support groove 513 along the length direction thereof.

[0062] When the iron shaft falls, the extension rod 51 will be subjected to a large vertical downward impact force. At this time, the two support rods 564 can withstand the impact force, thereby reducing the impact force on the driving screw rod 562 and preventing the driving screw rod 562 from being deformed and unable to work.

[0063] Reference Figure 4 and Figure 5 An isolation cavity 514 is defined in the upper end of the extension rod 51 , and an isolation hole 515 is defined on the side of the extension rod 51 facing the driving hand wheel 563 . The isolation hole 515 penetrates the extension rod 51 along the axial direction of the driving screw rod 562 , and the isolation hole 515 is communicated with the isolation cavity 514 .

[0064] Reference Figure 5 A connecting seat 565 is inserted into the isolation cavity 514, and the connecting seat 565 is slidably connected to the inner wall of the isolation cavity 514 along the vertical direction. A threaded hole 566 is opened through the connecting seat 565, and the threaded hole 566 is connected to the isolation hole 515. The driving screw rod 562 is plugged into the threaded hole 566, and the driving screw rod 562 is connected to the inner wall of the threaded hole 566 through threads.

[0065] Therefore, the connecting seat 565 can slide in the vertical direction. At the same time, the driving screw 562 can drive the connecting seat 565 to move, and the connecting seat 565 will resist the axial movement of the extension rod 51 along the driving screw 562, thereby satisfying the driving function of the driving screw 562 on the extension rod 51.

[0066] Reference Figure 5 A plurality of isolation springs 567 are arranged between the upper side of the connecting seat 565 and the upper inner wall of the isolation chamber 514 , and between the lower side of the connecting seat 565 and the lower inner wall of the isolation chamber 514 .

[0067] Therefore, when the extension rod 51 is impacted by the iron shaft, since the connecting seat 565 is isolated from the extension rod 51 and an isolation spring 567 is provided between the connecting seat 565 and the extension rod 51, the impact of the iron shaft is entirely borne by the extension rod 51 and the mounting seat 561, and the driving screw rod 562 and the connecting seat 565 do not bear or only bear a small impact, thereby improving the service life of the driving screw rod 562.

[0068] The implementation principle of the embodiment of the present application is: when sucking the iron shaft, the electromagnet 3 automatically descends, and at this time the iron shaft will automatically push open the anti-fall plate 52, so that the electromagnet 3 can suck the iron shaft; after the electromagnet 3 sucks the iron shaft, the anti-fall plate 52 automatically returns to a horizontal state under the action of the reset spring 54, and at this time the anti-fall plate 52 can prevent the iron shaft from falling suddenly.

[0069] When the iron shaft needs to be placed on the trolley, the electric hoist 2 is used to make the iron shaft close to the trolley, and then the anti-fall plate 52 is rotated by the reset drive 55, so that when the electromagnet 3 is powered off, the iron shaft can fall onto the corresponding trolley.

[0070] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An iron shaft turner, characterized in that: include: A fixed frame (1), an electric hoist (2) being mounted on the lower side of the fixed frame (1), and an electromagnet (3) being mounted on the hook of the electric hoist (2); A plurality of anti-falling components (5) are arranged on the electromagnet (3), and the plurality of anti-falling components (5) are arranged around the electromagnet (3) along the circumference of the electromagnet (3); The anti-falling assembly (5) comprises an extension rod (51) and an anti-falling plate (52), wherein the extension rod (51) is arranged in a vertical direction, the upper end of the extension rod (51) is connected to the electromagnet (3), the lower end of the extension rod (51) is connected to the anti-falling plate (52), the anti-falling plate (52) is arranged in a horizontal direction, the anti-falling plate (52) is rotatably connected to the extension rod (51), and one end of the anti-falling plate (52) along its own length direction is extended in the direction of the electromagnet (3); A reset driving member (55) for driving the anti-falling plate (52) to rotate is provided between the anti-falling plate (52) and the extension rod (51).

2. The iron shaft turner according to claim 1, characterized in that: A support plate (53) is provided at the lower end of the extension rod (51), the support plate (53) is arranged in a horizontal direction, and the anti-fall plate (52) is arranged on the upper side of the support plate (53); An end of the anti-falling plate (52) close to the electromagnet (3) extends beyond an end of the supporting plate (53) close to the electromagnet (3).

3. The iron shaft turner according to claim 1, characterized in that: The extension rod (51) is provided with a return spring (54), and two ends of the return spring (54) are respectively connected to the extension rod (51) and the anti-fall plate (52).

4. The iron shaft turner according to claim 3, characterized in that: The anti-fall plate (52) is rotatably connected to the extension rod (51) along the middle of its length direction; The return spring (54) is located on a side of the extension rod (51) away from the electromagnet (3), and one end of the return spring (54) is connected to the extension rod (51), and the other end of the return spring (54) is connected to an end of the anti-fall plate (52) away from the electromagnet (3).

5. The iron shaft turner according to claim 4, characterized in that: The reset drive member (55) is located on a side of the extension rod (51) away from the electromagnet (3), and one end of the reset drive member (55) is rotationally connected to the extension rod (51), and the other end of the reset drive member (55) is rotationally connected to an end of the anti-fall plate (52) away from the electromagnet (3).

6. The iron shaft turner according to claim 1, characterized in that: It also comprises a mounting plate (4), the electromagnet (3) is mounted on the mounting plate (4), and the electric hoist (2) is used to hoist the mounting plate (4); An adjusting driving member (56) is provided at the upper end of the extension rod (51) for driving the extension rod (51) to move towards or away from the electromagnet (3); The adjusting drive member (56) is arranged on the mounting plate (4).

7. The iron shaft turner according to claim 6, characterized in that: The adjustment drive member (56) comprises a mounting seat (561), the mounting seat (561) being connected to the mounting plate (4), a driving screw rod (562) being arranged in the mounting seat (561), the axial direction of the driving screw rod (562) being arranged along the length direction of the anti-fall plate (52), the driving screw rod (562) being connected to the extension rod (51) via a thread, and one end of the driving screw rod (562) being coaxially connected to a driving hand wheel (563), the driving hand wheel (563) being located on a side of the mounting seat (561) away from the electromagnet (3), and the driving hand wheel (563) being located outside the mounting seat (561).

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