Magnetic fixing device for hoisting machinery

Abstract

The application discloses a magnetic attraction fixing device for hoisting machinery and relates to the technical field of electromagnetic hoisting equipment. The magnetic attraction fixing device comprises a connecting frame, a magnetic attraction assembly is arranged on the inner side of the connecting frame, a hanging plate is arranged above the connecting frame, the magnetic attraction assembly comprises lifting connecting blocks and electromagnetic sucking discs, a plurality of lifting connecting blocks are arranged and horizontally distributed in the connecting frame, a plurality of electromagnetic sucking discs are arranged and respectively connected to the bottoms of the corresponding lifting connecting blocks. Since each lifting connecting block can be lifted individually, the corresponding lifting connecting block can be lowered, when the lowered lifting connecting block is lowered to be lower than the electromagnetic sucking disc at the adjacent position and the metal piece being adsorbed, the trigger rotating plate on the side wall of the lifting connecting block rebounds and opens, the power-on button switch arranged in this way is not under pressure, the electromagnetic sucking disc on the lowered lifting connecting block is automatically powered off and loses the magnetic force, the metal piece being adsorbed falls, the batch feeding control is realized, and the operation is convenient and effective.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic lifting equipment technology, and specifically to a magnetic fixing device for lifting machinery. Background Technology

[0002] Lifting equipment refers to electromechanical equipment used to handle or move heavy objects. It can lift heavy objects to a certain height and then move them a certain distance to achieve the handling of heavy objects. There are many types of lifting equipment, and electromagnetic lifting equipment is one of them. Electromagnetic lifting equipment relies on large electromagnetic adsorption components to attract magnetically attracted metal parts and then lift them up for transfer.

[0003] Existing electromagnetic lifting equipment includes a lifting assembly and an electromagnetic chuck assembly. The electromagnetic chuck assembly is installed on the lifting end of the lifting assembly. When the electromagnetic chuck assembly is energized, it generates a strong magnetic attraction force to lift and fix magnetically attracted metal parts, which are then lifted and transferred by the lifting assembly.

[0004] The shortcomings of existing electromagnetic lifting equipment are as follows: the electromagnetic chuck assembly of existing electromagnetic lifting equipment has a complete end face for adsorption. When a pile or multiple metal parts are picked up, multiple or piled metal parts can only be unloaded at the same time. It is not possible to unload multiple metal parts in batches. It can only lose the magnetic force by completely cutting off the power, so that multiple metal parts fall at the same time, or pick up metal parts one by one and transfer them one by one. In other words, it is not convenient to operate and use. Summary of the Invention

[0005] The purpose of this invention is to provide a magnetic chuck fixing device for lifting machinery, so as to solve the technical problem that the electromagnetic chuck assembly of the existing electromagnetic lifting equipment cannot remove multiple metal parts in batches, and the operation and use are not convenient enough.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution:

[0007] A magnetic fixing device for lifting machinery includes a connecting frame, with a magnetic suction component disposed on the inner side of the connecting frame; and a hanging plate disposed on the top of the connecting frame.

[0008] The magnetic suction assembly includes lifting connecting blocks and electromagnetic chucks. Multiple lifting connecting blocks are arranged horizontally within the connecting frame. Multiple electromagnetic chucks are connected to the bottom of corresponding lifting connecting blocks. Each lifting connecting block has a lifting guide rod connected to its upper end, and each lifting guide rod has a connecting sleeve fitted on its top. A linkage frame connects the connecting sleeves. An electric telescopic rod is connected to the front of each connecting sleeve, with its telescopic end penetrating the side wall of the connecting sleeve. A locking assembly is fitted between each lifting guide rod and the hanging plate, and the locking assembly engages with the telescopic end of the corresponding electric telescopic rod. The connecting frame is equipped with a lifting control assembly that connects to the connecting sleeves.

[0009] The side wall of the lifting connecting block is provided with a switch storage slot; a trigger rotating plate is provided inside the switch storage slot, and the top of the trigger rotating plate is movably connected to the inner top of the switch storage slot through a spring-loaded hinge; a power-on button switch is provided on the inner wall of the switch storage slot and is electrically connected to the corresponding electromagnetic chuck; each trigger rotating plate is provided with a limit component in cooperation with the connecting frame.

[0010] As a further aspect of the present invention: the limiting component includes a limiting top post and a movable cavity. The movable cavity is located at the bottom of the switch storage slot, and the limiting top post is located at the inner bottom of the switch storage slot. The upper end of the limiting top post is engaged with the bottom of the corresponding trigger plate, and the lower end of the limiting top post penetrates the side wall between the limiting top post and the movable cavity. A linkage guide rod is slidably inserted on the lifting connecting block. The bottom end of the linkage guide rod is inserted into the corresponding movable cavity and connected to the bottom end of the limiting top post. A horizontal protrusion is connected to the top of the linkage guide rod. A linkage rotating component is provided at the top of the lifting connecting block. A limiting stop is provided above the connecting frame. The horizontal protrusion engages with the limiting stop through the corresponding linkage rotating component.

[0011] As a further aspect of the present invention: the linkage guide rod and the transverse protrusion are an integrated structure.

[0012] As a further aspect of the present invention: the limiting stop includes a crossbeam and a top pressing block, the crossbeam is connected between the top two sides of the connecting frame, and multiple top pressing blocks are provided and are distributed laterally on the crossbeam.

[0013] As a further embodiment of the present invention: the linkage rotating component includes a shaft frame and a rotating rod. The shaft frame is connected to the top of the lifting connecting block, and the rotating rod is rotatably connected to the top of the shaft frame via a rotating shaft. One end of the rotating rod cooperates with a corresponding transverse protrusion, and the other end cooperates with a corresponding top pressing block.

[0014] As a further aspect of the present invention, both ends of the rotating rod are spherical ends.

[0015] As a further embodiment of the present invention: the locking assembly includes a connecting slide cavity, a sliding hook plate, and a docking ring. The connecting slide cavity is located at the top of the lifting guide rod, and the side of the connecting slide cavity near the telescopic end of the electric telescopic rod is open. A linkage slider is slidably connected inside the connecting slide cavity, and a limit spring is connected between the linkage slider and the inner wall of the connecting slide cavity. The sliding hook plate is connected to the upper side of the linkage slider, and a movable opening is provided on the upper side of the connecting slide cavity, through which the sliding hook plate passes. The docking ring is connected to the bottom of the hanging plate, and the top of the sliding hook plate is horizontally inserted into the docking ring.

[0016] As a further embodiment of the present invention: the lifting control component includes connecting guide rails and drive motors. Two connecting guide rails are provided and are respectively connected to the upper two sides of the connecting frame. Each connecting guide rail is vertically rotatably connected to an adjusting screw. Two drive motors are provided and are respectively connected to the upper end of the corresponding connecting guide rail. The main shaft of the drive motor is connected to the rotating end of the corresponding adjusting screw. A connecting slider is slidably connected in both connecting guide rails. The adjusting screw passes through the corresponding connecting slider and is threadedly connected to the connecting slider. The connecting slider is connected to the linkage frame.

[0017] The beneficial effects of this invention are:

[0018] 1. The magnetic suction component of this invention is composed of multiple lifting connecting blocks and electromagnetic chucks. When it is necessary to transfer a pile of metal parts, the magnetic suction component is used to directly lift and fix the metal parts before transfer. When it is necessary to unload some metal parts or to place metal parts in batches at different locations, since each lifting connecting block can be lifted and lowered individually, the corresponding lifting connecting block can be lowered. When the lowered lifting connecting block is lower than the electromagnetic chuck and the metal parts adsorbed at the adjacent position, the trigger plate on its side wall will spring back and open. The power-on button switch is thus designed so that there is no pressure action and the electromagnetic chuck on the lowered lifting connecting block will automatically lose power and lose its magnetic force, thus facilitating the falling of the adsorbed metal parts. This achieves batch placement control and is convenient and effective in operation.

[0019] 2. This invention relies on a drive motor to rotate an adjusting screw, causing the connecting slider on the adjusting screw to rise and fall. When it is necessary for the corresponding lifting connecting block to rise and fall with the electromagnetic chuck, the electric telescopic rod on the connecting sleeve corresponding to the lifting connecting block extends. The telescopic end of the electric telescopic rod then inserts into the connecting slide cavity on the corresponding lifting guide rod, causing the sliding hook plate to separate from the docking ring on the hanging plate. This facilitates the corresponding connecting sleeve to drive the lifting guide rod to rise and fall synchronously, thus enabling the corresponding lifting connecting block to achieve lifting and falling motion. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of a partial cross-sectional view of the left side of the structure in which the lifting guide rod and the connecting sleeve are connected in this invention.

[0023] Figure 3 This is a partial structural diagram of adjacent lifting connecting blocks in this invention when they are mated together;

[0024] Figure 4 yes Figure 3 Enlarged structural diagram at point A;

[0025] Figure 5 This is a schematic diagram of the overall structure of a single lifting connecting block after it has descended in this invention;

[0026] Figure 6 yes Figure 5 A magnified structural diagram at point B in the middle.

[0027] In the diagram: 1. Connecting frame; 2. Lifting connecting block; 3. Electromagnetic chuck; 4. Lifting guide rod; 5. Horizontal frame; 6. Connecting guide rail; 7. Adjusting screw; 8. Connecting slider; 9. Drive motor; 10. Connecting sleeve; 11. Hanging plate; 12. Docking ring; 13. Sliding hook plate; 14. Movable opening; 15. Connecting slide cavity; 16. Limiting spring; 17. Linkage slider; 18. Electric telescopic rod; 19. Linkage guide rod; 20. Switch storage slot; 21. Trigger turntable; 22. Power-on button switch; 23. Limiting top column; 24. Movable cavity; 25. Shaft frame; 26. Rotating rod; 27. Top pressure block; 28. Horizontal protrusion; 29. ​​Linkage frame. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-6 As shown, a magnetic attraction fixing device for lifting machinery includes a connecting frame 1, a magnetic attraction component is provided on the inner side of the connecting frame 1, the magnetic attraction component generates magnetic force when energized, and is used to attract metal parts; a hanging plate 11 is provided above the connecting frame 1, the hanging plate 11 is fixed relative to the connecting frame 1, and connecting rings are distributed on the edge of the hanging plate 11 for connecting the lifting rope assembly of the lifting equipment, so as to facilitate lifting.

[0030] The magnetic suction assembly includes lifting connecting blocks 2 and electromagnetic chucks 3. Multiple lifting connecting blocks 2 are arranged laterally inside the connecting frame 1, with the side walls of adjacent lifting connecting blocks 2 abutting against each other. Multiple electromagnetic chucks 3 are arranged and connected to the bottom of the corresponding lifting connecting block 2. A lifting guide rod 4 is fixedly connected to the upper end of each lifting connecting block 2. A connecting sleeve 10 is fitted onto the top of each lifting guide rod 4. A linkage frame 29 connects the connecting sleeves 10. An electric telescopic rod 18 is fixedly connected to the front side of the connecting sleeve 10, and the telescopic end of the electric telescopic rod 18 penetrates the side wall of the connecting sleeve 10. Each lifting guide rod 4 is connected to the hanging plate 11. Each component is equipped with a locking assembly, which engages with the telescopic end of the corresponding electric telescopic rod 18. The locking assembly includes a connecting slide cavity 15, a sliding hook plate 13, and a docking ring 12. The connecting slide cavity 15 is located at the top of the lifting guide rod 4, with an opening on the side near the telescopic end of the electric telescopic rod 18. A linkage slider 17 is slidably connected within the connecting slide cavity 15, and a compressible limiting spring 16 connects the linkage slider 17 to the inner wall of the connecting slide cavity 15. The sliding hook plate 13 is connected to the upper side of the linkage slider 17, and a movable opening 14 is provided on the upper side of the connecting slide cavity 15, through which the sliding hook plate 13 passes. The movable port 14 and the docking ring 12 are connected to the bottom of the hanging plate 11, and the top of the sliding hook plate 13 is horizontally inserted into the docking ring 12. When the top of the sliding hook plate 13 is horizontally inserted into the docking ring 12, the opening of the connecting slide cavity 15 is aligned with the telescopic end of the electric telescopic rod 18. At this time, the lifting guide rod 4 cannot move downward, so that the lifting connecting block 2 is in the connecting frame 1, and the connecting sleeve 10 can slide longitudinally relative to the lifting guide rod 4. When it is necessary for the connecting sleeve 10 to drive the lifting guide rod 4 to move synchronously, the electric telescopic rod 18 is activated to extend, and the telescopic end of the electric telescopic rod 18 is inserted into the connecting slide cavity 15 on the lifting guide rod 4. Within 5, when the telescopic end of the electric telescopic rod 18 is inserted, it pushes against the linkage slider 17, pushing the linkage slider 17 to move laterally and compress the limit spring 16. During this process, the linkage slider 17 drives the sliding hook plate 13 to move laterally and disengage from the docking ring 12. Then the connecting sleeve 10 descends. Since the telescopic end of the electric telescopic rod 18 on the connecting sleeve 10 is inserted into the connecting slide cavity 15, it can drive the lifting guide rod 4 to descend synchronously. However, since the electric telescopic rod 18 is not activated to extend in other positions, the connecting sleeve 10 only slides down relative to the connected lifting guide rod 4. In this way, only the lifting connecting block 2 that is to be controlled to descend can drive the corresponding electromagnetic chuck 3 to descend.

[0031] The connecting frame 1 is provided with a lifting control component that cooperates with the connecting sleeve 10. The lifting control component includes a connecting guide rail 6 and a drive motor 9. There are two connecting guide rails 6, which are vertically connected to the upper two sides of the connecting frame 1 respectively. Each connecting guide rail 6 has an adjusting screw 7 vertically rotatably connected inside. There are two drive motors 9, which are connected to the upper end of the corresponding connecting guide rail 6 respectively. The main shaft of the drive motor 9 is connected to the rotating end of the corresponding adjusting screw 7. A connecting slider 8 is slidably connected inside each of the two connecting guide rails 6. The adjusting screw 7 passes through the corresponding connecting slider 8 and is threadedly connected to the connecting slider 8. The connecting slider 8 is connected to the linkage frame 29. When it is necessary for the connecting sleeve 10 to move up and down, the drive motor 9 is started, which drives the adjusting screw 7 to rotate. Since the connecting slider 8 is threadedly connected to the adjusting screw 7, the connecting slider 8 slides along the connecting guide rail 6, thereby driving the connecting sleeve 10 to move longitudinally through the linkage frame 29.

[0032] The side wall of the lifting connecting block 2 is provided with a switch storage slot 20. It should be noted that since multiple lifting connecting blocks 2 are distributed horizontally in the connecting frame 1, the lifting connecting blocks 2 that are directly attached to the inner walls of the two sides of the connecting frame 1 are provided with a switch storage slot 20 only on the side closest to the center of the connecting frame 1, while the lifting connecting blocks 2 distributed in the middle are provided with switch storage slots 20 on both sides.

[0033] A trigger plate 21 is fitted inside the switch storage slot 20, and the top of the trigger plate 21 is movably connected to the inner top of the switch storage slot 20 via a spring-loaded hinge. An energized push-button switch 22, electrically connected to the corresponding electromagnetic chuck 3, is installed on the inner wall of the switch storage slot 20. When the trigger plate 21 is stored in the switch storage slot 20, the connected spring-loaded hinge has a restoring force, causing the trigger plate 21 to abut against the energized push-button switch 22. The pressed energized push-button switch 22 connects the circuit of the corresponding electromagnetic chuck 3, putting it in an electrically operable state. The circuit of the electromagnetic chuck 3 also includes a manually operated start button. The manual start button switch can be activated, and multiple electromagnetic chucks 3 can be electrically connected to the same manually operated start button switch at the same time. This means that the manually operated start button switch can simultaneously energize all electromagnetic chucks 3. Only when the energized start button switch 22 is under pressure can the manually operated start button switch energize all electromagnetic chucks 3 to generate magnetic force. Furthermore, when each lifting connecting block 2 is assembled in the connecting frame 1, the trigger rotating plate 21 on each lifting connecting block 2 is squeezed and stored in the switch storage slot 20 by the pressure of the adjacent lifting connecting block 2, causing the corresponding energized start button switch 22 to be squeezed.

[0034] When it is necessary to drop the locally adsorbed metal parts, the electric telescopic rod 18 at the corresponding position can be controlled to extend and insert into the connecting slide cavity 15 on the corresponding lifting guide rod 4, thereby unlocking the top of the lifting guide rod 4. Then, the lifting guide rod 4 is driven to descend through the connecting sleeve 10. The lifting guide rod 4 then lowers along with the corresponding lifting connecting block 2 and the electromagnetic chuck 3. When the lifting connecting block 2 descends to the corresponding position and is completely lower than the adjacent electromagnetic chuck 3 and the metal parts it adsorbs, the trigger rotating plate 21 on the side wall of the lifting connecting block 2 springs back and rotates out, separating from the corresponding power-on button switch 22. Thus, the descending electromagnetic chuck 3 loses power and loses its magnetic force. At the same time, since the descending electromagnetic chuck 3 carries some of the originally adsorbed metal parts down to a certain position, it is convenient to separate them from the metal parts adsorbed in other positions. Thus, when the power is off and the magnetic force is lost, the metal parts on the descending electromagnetic chuck 3 are directly separated, thereby achieving partial unloading.

[0035] Each trigger plate 21 is fitted with a limit component in conjunction with the connecting frame 1. The limit component includes a limit top post 23 and a movable cavity 24. The movable cavity 24 is located at the bottom of the switch storage slot 20, and the limit top post 23 is located at the inner bottom of the switch storage slot 20. The upper end of the limit top post 23 abuts against the bottom of the corresponding trigger plate 21, and the lower end of the limit top post 23 penetrates the side wall between the limit top post 23 and the movable cavity 24. A linkage guide rod 19 is slidably inserted on the lifting connecting block 2, and the bottom end of the linkage guide rod 19 is inserted into the corresponding movable cavity 24. 4. It is connected to the bottom end of the limiting top column 23; the top end of the linkage guide rod 19 is fixedly connected to the horizontal protrusion 28. The linkage guide rod 19 and the horizontal protrusion 28 are an integrated structure. The top of the lifting connecting block 2 is provided with a linkage rotating component. The upper part of the connecting frame 1 is provided with a limiting stop. The horizontal protrusion 28 cooperates with the limiting stop through the corresponding linkage rotating component. The limiting stop includes a horizontal frame 5 and a top pressing block 27. The horizontal frame 5 is connected between the top two sides of the connecting frame 1. Multiple top pressing blocks 27 are provided and are horizontally distributed on the horizontal frame 5. The linkage rotating component includes The shaft bracket 25 and the rotating rod 26 are fixedly connected to the top of the lifting connecting block 2. The rotating rod 26 is rotatably connected to the top of the shaft bracket 25 via a rotating shaft. One end of the rotating rod 26 engages with the corresponding transverse protrusion 28, and the other end engages with the corresponding top pressing block 27. Both ends of the rotating rod 26 are spherical to facilitate relative sliding when in contact with the top pressing block 27 and the transverse protrusion 28. When the lifting connecting block 2 is within the connecting frame 1, one end of the rotating rod 26 abuts against the bottom of the corresponding top pressing block 27, and the other end of the rotating rod 26 rotates and tilts upwards. Furthermore, the linkage guide rod 19 is in the raised state, which is abutting against the bottom of the corresponding horizontal protrusion 28, so that the connected limiting top post 23 abuts against the bottom of the corresponding trigger rotating plate 21. In this way, even if a certain lifting connecting block 2 is lowered and offset from an adjacent position, the trigger rotating plate 21 on the side wall of the lifting connecting block 2 cannot rotate and pop out because the bottom is pressed by the limiting top post 23. This avoids the electromagnetic chuck 3 at the bottom of the lifting connecting block 2 that has not been lowered losing power and losing its magnetic force, ensuring that only the electromagnetic chuck 3 connected to the lowered lifting connecting block 2 is de-energized.

[0036] The working principle of this invention is as follows: When it is necessary to lift and transfer a pile of magnetically attractable metal parts, the entire magnetic assembly is energized to generate magnetic force, which then lifts the pile of metal parts and transfers them using lifting equipment. When it is only necessary to remove some metal parts, or to remove the fixedly attracted metal parts in batches, the electric telescopic rod 18 at the corresponding position is controlled to extend. The telescopic end of the electric telescopic rod 18 is inserted into the connecting slide cavity 15 on the lifting guide rod 4. When the telescopic end of the electric telescopic rod 18 is inserted, it pushes against the linkage slider 17, causing the linkage slider 17 to move laterally and compress the limiting spring 16. During this process, the linkage slider 17 drives the sliding hook plate 13 to move laterally and disengage from the docking ring 12, realizing the corresponding... The top of the lifting guide rod 4 is unlocked, and then the drive motor 9 is started, causing the drive motor 9 to drive the adjusting screw 7 to rotate. Since the connecting slider 8 is threadedly connected to the adjusting screw 7, the connecting slider 8 slides along the connecting guide rail 6, thereby driving the connecting sleeve 10 to move downward through the linkage frame 29. In this way, all the connecting sleeves 10 descend, and the connecting sleeve 10 corresponding to the extended electric telescopic rod 18 can drive the lifting guide rod 4 to descend synchronously because the telescopic end of the electric telescopic rod 18 is inserted into the connecting slide cavity 15. The connecting sleeves 10 in other positions only slide down relative to the connected lifting guide rod 4 because the electric telescopic rod 18 has not been activated to extend. In this way, only the lifting connecting block 2 that needs to be controlled to descend can drive the corresponding electromagnetic chuck 3 to descend.

[0037] As each lifting connecting block 2 is distributed in the connecting frame 1, the adjacent lifting connecting blocks 2 are in contact with each other, and the set trigger plate 21 is squeezed by the limit and stored in the corresponding switch storage slot 20. At this time, the corresponding power button switch 22 is pressed, so that the circuit of the corresponding electromagnetic chuck 3 is connected and in a power-on controllable state.

[0038] When the lifting connecting block 2 descends to the corresponding position and is completely lower than the adjacent electromagnetic chuck 3 and the metal parts it adsorbs, the trigger plate 21 on the side wall of the lifting connecting block 2 springs back and rotates out, separating from the corresponding power-on button switch 22. In this way, the descending electromagnetic chuck 3 loses power and loses its magnetic force. At the same time, since the descending electromagnetic chuck 3 carries some of the metal parts it originally adsorbed down to a certain position, it is convenient to separate from the metal parts adsorbed in other positions. In this way, when the power is off and the magnetic force is lost, the metal parts on the descending electromagnetic chuck 3 are directly separated, which is conducive to partial unloading.

[0039] Simultaneously, when the lifting connecting block 2 is inside the connecting frame 1, one end of the rotating rod 26 abuts against the bottom of the corresponding top pressing block 27, and the other end of the rotating rod 26 rotates and tilts up, abutting against the bottom of the corresponding horizontal protrusion 28. The linkage guide rod 19 is in the raised state, so that the connected limiting top post 23 abuts against the bottom of the corresponding trigger rotating plate 21. In this way, even if a lifting connecting block 2 adjacent to another lifting connecting block 2 falls and shifts away, the trigger rotating plate 21 on the side wall of that lifting connecting block 2 cannot rotate and pop out because its bottom is pressed by the limiting top post 23. This avoids the electromagnetic chuck 3 at the bottom of the lifting connecting block 2 that has not fallen being de-energized and losing its magnetic force, ensuring that only the electromagnetic chuck 3 connected to the falling lifting connecting block 2 is de-energized.

[0040] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A magnetic fixing device for lifting machinery, comprising a connecting frame (1), wherein a magnetic assembly is provided on the inner side of the connecting frame (1); and a hanging plate (11) is provided on the upper part of the connecting frame (1); characterized in that: The magnetic suction assembly includes a lifting connecting block (2) and an electromagnetic chuck (3). Multiple lifting connecting blocks (2) are provided and are distributed laterally inside the connecting frame (1). Multiple electromagnetic chucks (3) are provided and are respectively connected to the bottom of the corresponding lifting connecting block (2). The upper end of each lifting connecting block (2) is connected to a lifting guide rod (4). The top of each lifting guide rod (4) is fitted with a connecting sleeve (10). A linkage frame (29) is connected between the connecting sleeves (10). An electric telescopic rod (18) is connected to the front side of the connecting sleeve (10), and the telescopic end of the electric telescopic rod (18) penetrates the side wall of the connecting sleeve (10). A locking assembly is provided between each lifting guide rod (4) and the hanging plate (11), and the locking assembly cooperates with the telescopic end of the corresponding electric telescopic rod (18). A lifting control assembly that cooperates with the connecting sleeve (10) is provided on the connecting frame (1). The side wall of the lifting connecting block (2) is provided with a switch storage slot (20); a trigger rotating plate (21) is provided inside the switch storage slot (20), and the top of the trigger rotating plate (21) is movably connected to the inner top of the switch storage slot (20) through a spring hinge. A power-on button switch (22) is provided on the inner wall of the switch storage slot (20) and is electrically connected to the corresponding electromagnetic chuck (3). When the trigger rotating plate (21) is stored in the switch storage slot (20), the connected spring hinge has a spring force, and the trigger rotating plate (21) abuts against the power-on button switch (22). The pressed power-on button switch (22) connects the circuit of the corresponding electromagnetic chuck (3). Each trigger rotating plate (21) is provided with a limit component in cooperation with the connecting frame (1). The limiting component includes a limiting top post (23) and a movable cavity (24). The movable cavity (24) is located at the bottom of the switch storage slot (20). The limiting top post (23) is located at the inner bottom of the switch storage slot (20). The upper end of the limiting top post (23) is fitted to the bottom of the corresponding trigger plate (21). The lower end of the limiting top post (23) passes through the side wall between the limiting top post (23) and the movable cavity (24). A linkage guide rod (19) is slidably inserted on the lifting connecting block (2). The bottom end of the linkage guide rod (19) is inserted into the corresponding movable cavity (24) and connected to the bottom end of the limiting top post (23). A horizontal protrusion (28) is connected to the top of the linkage guide rod (19). A linkage rotating component is provided on the top of the lifting connecting block (2). A limiting stop is provided above the connecting frame (1). The horizontal protrusion (28) cooperates with the limiting stop through the corresponding linkage rotating component.

2. The magnetic fixing device for lifting machinery according to claim 1, characterized in that, The linkage guide rod (19) and the transverse protrusion (28) are an integrated structure.

3. The magnetic fixing device for lifting machinery according to claim 1, characterized in that, The limiting stop includes a cross frame (5) and a top pressing block (27). The cross frame (5) is connected between the top two sides of the connecting frame (1). Multiple top pressing blocks (27) are provided and are distributed laterally on the cross frame (5).

4. A magnetic fixing device for lifting machinery according to claim 3, characterized in that, The linkage rotating component includes a shaft frame (25) and a rotating rod (26). The shaft frame (25) is connected to the top of the lifting connecting block (2). The rotating rod (26) is rotatably connected to the top of the shaft frame (25) via a rotating shaft. One end of the rotating rod (26) cooperates with the corresponding transverse protrusion (28), and the other end cooperates with the corresponding top pressing block (27).

5. A magnetic fixing device for lifting machinery according to claim 4, characterized in that, Both ends of the rotating rod (26) are spherical.

6. A magnetic fixing device for lifting machinery according to claim 1, characterized in that, The locking assembly includes a connecting slide cavity (15), a sliding hook plate (13), and a docking ring (12). The connecting slide cavity (15) is located at the top of the lifting guide rod (4). The side of the connecting slide cavity (15) near the telescopic end of the electric telescopic rod (18) is open. A linkage slider (17) is slidably connected inside the connecting slide cavity (15). A limit spring (16) is connected between the linkage slider (17) and the inner wall of the connecting slide cavity (15). The sliding hook plate (13) is connected to the upper side of the linkage slider (17). A movable opening (14) is provided on the upper side of the connecting slide cavity (15), and the sliding hook plate (13) passes through the movable opening (14). The docking ring (12) is connected to the bottom of the hanging plate (11), and the top of the sliding hook plate (13) is horizontally inserted into the docking ring (12).

7. A magnetic fixing device for lifting machinery according to claim 1, characterized in that, The lifting control assembly includes a connecting guide rail (6) and a drive motor (9). There are two connecting guide rails (6), which are respectively connected to the upper two sides of the connecting frame (1). Each connecting guide rail (6) is vertically rotatably connected to an adjusting screw (7). There are two drive motors (9), which are respectively connected to the upper end of the corresponding connecting guide rail (6). The main shaft of the drive motor (9) is connected to the rotating end of the corresponding adjusting screw (7). Each of the two connecting guide rails (6) is slidably connected to a connecting slider (8). The adjusting screw (7) passes through the corresponding connecting slider (8), and the adjusting screw (7) is threadedly connected to the connecting slider (8). The connecting slider (8) is connected to the linkage frame (29).

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