A concrete shaft hoisting apparatus

Abstract

The present application provides a kind of concrete shaft hoisting equipment, including fishing rod and concrete shaft, the top end of the fishing rod is equipped with protective assembly, the protective assembly includes rubber ring and cone plate, the bottom end of the fishing rod is equipped with fixed assembly, the fixed assembly includes support sleeve and plug rod, limit assembly is installed on the plug rod, the limit assembly includes electromagnet and stopper, the stopper is equipped with positioning assembly, the positioning assembly includes insert piece and electromagnet two, the concrete shaft hoisting equipment can prevent a large amount of soil from causing interference to subsequent concrete shaft hoisting work, while ensuring the safe operation of the equipment at the bottom of the fishing rod, ensuring the firmness of the concrete shaft, ensuring the safety of the concrete shaft, accurately inserting the plug rod into the gap of the concrete shaft, avoiding the plug rod from being unable to insert into the gap of the concrete shaft, improving the hoisting efficiency of the concrete shaft, and suitable for the hoisting of concrete shaft.

Description

Technical Field

[0001] This invention relates to the field of concrete well shaft lifting equipment technology, specifically to a concrete well shaft lifting device. Background Technology

[0002] When installing and dismantling concrete well shafts, concrete well shaft lifting equipment is often required. Patent application CN200910066211.4 discloses a multi-rope winding stage hoist, which divides the lifting container into a top lifting container and a bottom lifting container, reducing the size of the lifting container and the well shaft. A large integral universal coupling is used to connect the main shafts to balance the torque generated during deep well lifting, reducing the power of the hoist motor. The hydraulic station uses an electrically delayed two-stage braking hydraulic station for easier adjustment. Patent application CN201920735625.0 discloses a concrete well shaft lifting device that can lift the concrete well shaft by locking it from the inside without damaging it. Lifting and installation are also convenient and quick, saving manpower and time, and effectively shortening construction time. To expedite construction, accelerate progress, and improve production efficiency, existing concrete wellbore lifting equipment, based on its publicly available technical solutions, suffers from several drawbacks. Firstly, during the lifting process, soil from the inner wall of the well is easily scraped off, impacting the lifting equipment. Soil falling to the bottom also hinders subsequent lifting operations. Secondly, securing the inner wall of the well for lifting often requires significant pressure, leading to slippage or damage. Thirdly, lifting from the bottom of the well often makes it difficult to quickly locate the gap, hindering rod insertion and reducing efficiency. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a concrete well shaft lifting device to solve the problems mentioned in the background art. This invention has a novel structure, multiple functions, and is suitable for lifting concrete well shafts.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a concrete well shaft lifting device, comprising a lifting rod and a concrete well shaft, wherein a protective component is installed at the top of the lifting rod, the protective component comprising a rubber ring and a cone plate, a fixing component is installed at the bottom of the lifting rod, the fixing component comprising a support sleeve and an insert rod, a limiting component is installed on the insert rod, the limiting component comprising an electromagnet and a stop block, a positioning component is installed on the stop block, the positioning component comprising an insert plate and an electromagnet, a pushing component is installed on the lifting rod, the pushing component comprising an inclined sleeve and a clamping plate, a hydraulic component is installed at the top of the inclined sleeve, the hydraulic component comprising a sleeve and a motor, and a limiting component is installed on the inner side of the clamping plate, the limiting component comprising a sliding groove and a button.

[0005] Furthermore, an inner sleeve is threadedly installed on the outer side of the top of the lifting rod, and an outer sleeve is fitted on the outer side of the inner sleeve. The bottom of the outer sleeve is connected to the bottom of the inner sleeve by a spring.

[0006] Furthermore, the rubber ring is secured to the top of the concrete well shaft, the bottom of the cone plate is bonded to the top of the rubber ring, the top of the cone plate is bonded to the outer side of the outer sleeve, and a button is bolted to the top of the inner sleeve.

[0007] Furthermore, the support sleeve is welded around the bottom of the lifting rod, the electromagnet is bolted to the inside of the support sleeve, one end of the insertion rod is connected to the electromagnet through the spring, the other end of the insertion rod passes through the support sleeve and extends to the inner wall of the concrete well shaft, and the stop block is welded to the top of the other end of the insertion rod.

[0008] Furthermore, a slot is provided at the top of the other end of the insertion rod, the insert is inserted into the inner side of the slot, a connecting rod is welded to the electromagnet second, one end of the connecting rod passes through the stop block and extends to the inner side of the stop block, a button second is welded to the inner side of the stop block, the button second is located inside the other end of the connecting rod, the electromagnet second is connected to the stop block through the spring third, and the electromagnet second is welded to the top of the insert.

[0009] Furthermore, the inclined sleeve is welded to the outer side of the lifting rod, the inclined sleeve is evenly distributed on the lifting rod, the inclined sleeve is located at the top of the support sleeve, the sleeve is welded to the outer side of the lifting rod, and the motor is installed on the top of the sleeve by bolts.

[0010] Furthermore, a piston is fitted inside the sleeve, and a lead screw is fitted inside the piston. The top end of the lead screw is keyed to the output shaft of the motor, and the bottom end of the lead screw passes through the piston via a thread and is mounted on the inner wall of the bottom of the sleeve via a bearing.

[0011] Furthermore, the bottom of the sleeve is connected to the inner side of the inclined sleeve via a connecting pipe, and an inclined rod is clamped on the inner side of the inclined sleeve. The top end of the inclined rod passes through the inclined sleeve and extends to the outer side of the inclined sleeve.

[0012] Furthermore, the slide is formed on the inner side of the card plate, the other end of the inclined rod extends to the inner side of the slide, the other end of the inclined rod is connected to the inner wall of the slide by spring four, and the button three is installed on the inner side of the slide by bolts.

[0013] Furthermore, button one is connected to electromagnet one and electromagnet two via wires, button two is connected to button three via wires, and button three is connected to a motor via wires.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. When using this concrete well shaft lifting equipment, high-pressure air is introduced into the rubber ring according to the diameter of the well body, causing the rubber ring to expand to be equal to or slightly smaller than the inner diameter of the well body. The lifting rod is then moved downwards through the top of the well body until the rubber ring reaches the top of the concrete well shaft, causing the concrete well shaft to press upwards against the rubber ring. The rubber ring, through the conical plate, presses upwards against the outer sleeve, and the outer sleeve, on the outside of the inner sleeve, stretches the spring and presses the button. At this point, the rubber ring is completely locked at the top of the concrete well shaft. When the concrete well shaft is lifted upwards, the soil falling off the inner wall of the well is blocked by the conical plate and the rubber ring, thus effectively preventing soil from falling to the bottom of the well body and preventing a large amount of soil from interfering with the subsequent concrete well shaft lifting operation. At the same time, it ensures the safe operation of the equipment at the bottom of the lifting rod.

[0016] 2. When using this concrete well shaft lifting equipment, button two turns on the motor. The motor pushes the piston downward through the lead screw, and hydraulic oil enters the inside of the inclined sleeve through the connecting pipe. The inclined rod moves upward and clamps the clamping plate onto the inner wall of the concrete well shaft. After the clamping plate is clamped onto the inner wall of the concrete well shaft, the clamping plate stops moving, and the inclined rod slides in the groove, pushing the clamping plate upward. The clamping plate lifts the concrete well shaft upward. When the inclined rod presses against button three, the motor is turned off, thus avoiding damage to the concrete well shaft due to excessive pressure from the clamping plate, ensuring the safety of the concrete well shaft. After the concrete well shaft is slightly pushed upward, the insertion rod is inserted into the bottom of the concrete well shaft and blocked by the stop block, preventing the insertion rod from inserting into the inner wall of the shaft. This allows for simultaneous upward lifting of the concrete well shaft through the pressure of the clamping plate and the pulling of the insertion rod, ensuring both the secure fixing of the concrete well shaft and its safety.

[0017] 3. When the concrete well shaft lifting equipment is in use, after button one is pressed, both electromagnet one and electromagnet two are closed. Spring two pushes the insert rod outward to the inner wall of the concrete well shaft. Spring three pushes electromagnet two, which in turn drives the insert plate to lock onto the inner wall of the concrete well shaft. At this time, the insert rod and insert plate are located on the inner wall of the top of the bottom of the concrete well shaft. Then, the lifting rod is slightly lifted upward, and the insert plate is inserted into the gap of the concrete well shaft. This causes the connecting rod to press button two, which can effectively position the gap of the concrete well shaft. This allows the insert rod to be accurately inserted into the gap of the concrete well shaft, avoiding misalignment or failure to insert the rod into the gap, thereby improving the lifting efficiency of the concrete well shaft. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lifting rod structure of a concrete well shaft lifting device according to the present invention;

[0019] Figure 2 This is a schematic diagram of the operation of a concrete well shaft lifting device according to the present invention;

[0020] Figure 3 This is a cross-sectional view of a rubber ring in a concrete well shaft lifting device according to the present invention;

[0021] Figure 4 This is a cross-sectional view of a support sleeve for a concrete well shaft lifting device according to the present invention;

[0022] Figure 5 This is a cross-sectional view of the inclined sleeve of a concrete well shaft lifting device according to the present invention;

[0023] Figure 6 This is a cross-sectional view of the insert of a concrete well shaft lifting device according to the present invention;

[0024] Figure 7 This is a cross-sectional view of the clamping plate of a concrete well shaft lifting device according to the present invention;

[0025] In the diagram: 1. Lifting rod; 2. Concrete well; 3. Rubber ring; 4. Conical plate; 5. Inner sleeve; 6. Outer sleeve; 7. Spring 1; 8. Button 1; 9. Support sleeve; 10. Insert rod; 11. Spring 2; 12. Electromagnet 1; 13. Stop block; 14. Insert plate; 15. Electromagnet 2; 16. Connecting rod; 17. Spring 3; 18. Button 2; 19. Slanted sleeve; 20. Slanted rod; 21. Clamping plate; 22. Sleeve; 23. Motor; 24. Piston; 25. Lead screw; 26. Connecting pipe; 27. Slide groove; 28. Spring 4; 29. ​​Button 3. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0027] Please see Figures 1 to 7 This invention provides a technical solution: a concrete well shaft lifting device, comprising a lifting rod 1 and a concrete well shaft 2. A protective assembly is installed at the top of the lifting rod 1, the protective assembly including a rubber ring 3 and a cone plate 4. A fixing assembly is installed at the bottom of the lifting rod 1, the fixing assembly including a support sleeve 9 and an insert rod 10. A limit component is installed on the insert rod 10, the limit component including an electromagnet 12 and a stop block 13. A positioning component is installed on the stop block 13, the positioning component including an insert plate 14 and an electromagnet. 2.15. A pushing assembly is installed on the lifting rod 1. The pushing assembly includes a slanted sleeve 19 and a clamping plate 21. A hydraulic assembly is installed on the top of the slanted sleeve 19. The hydraulic assembly includes a sleeve 22 and a motor 23. A limiting assembly is installed on the inner side of the clamping plate 21. The limiting assembly includes a sliding groove 27 and a button 29. An inner sleeve 5 is threaded onto the top of the lifting rod 1 via its outer side. An outer sleeve 6 is fitted onto the outer side of the inner sleeve 5. The bottom of the outer sleeve 6 is connected to the bottom of the inner sleeve 5 via a spring 7. The rubber ring 3 is secured to the top of the concrete well cylinder 2. The bottom of the cone plate 4 is bonded to the top of the rubber ring 3, and the top of the cone plate 4 is bonded to the outer side of the outer sleeve 6. The top of the inner sleeve 5 is bolted with a button 8. In use, high-pressure air is introduced into the rubber ring 3 according to the diameter of the well body, causing the rubber ring 3 to expand to be equal to or slightly smaller than the inner diameter of the well body. The lifting rod 1 is then moved downward through the top of the well body until the rubber ring 3 moves to the top of the concrete well cylinder 2, causing the concrete well cylinder to press the rubber ring 3 upward. The rubber ring 3, through the cone plate 4, presses the outer sleeve 6 upward. The outer sleeve 6 stretches the spring 7 on the outside of the inner sleeve 7 and presses the button 8. At this time, the rubber ring 3 is completely secured to the top of the concrete well cylinder 2. When the concrete well cylinder 2 is lifted upward, the soil falling off the inner wall of the well is blocked by the cone plate 4 and the rubber ring 3, thus effectively preventing soil from falling into the bottom of the well body and preventing a large amount of soil from interfering with the subsequent lifting of the concrete well cylinder 2. At the same time, it ensures the safe operation of the equipment at the bottom of the lifting rod 1.

[0028] In this embodiment, the support sleeve 9 is welded around the bottom of the lifting rod 1. The electromagnet 12 is bolted to the inside of the support sleeve 9. One end of the insertion rod 10 is connected to the electromagnet 12 via a spring 11. The other end of the insertion rod 10 passes through the support sleeve 9 and extends to the inner wall of the concrete well shaft 2. The stop block 13 is welded to the top of the other end of the insertion rod 10. A slot is provided at the top of the other end of the insertion rod 10, and the insert 14 is engaged inside the slot. A connecting rod 16 is welded to iron rod 15. One end of the connecting rod 16 passes through stop block 13 and extends to the inside of stop block 13. A button 18 is welded to the inside of stop block 13. The button 18 is located inside the other end of the connecting rod 16. Electromagnet 15 is connected to stop block 13 via spring 17. Electromagnet 15 is welded to the top of insert 14. An inclined sleeve 19 is welded to the outer side of lifting rod 1. The inclined sleeves 19 are evenly distributed on lifting rod 1. 9 is located at the top of the support sleeve 9. The sleeve 22 is welded to the outer side of the lifting rod 1. The motor 23 is installed on the top of the sleeve 22 by bolts. In use, when the button 18 is pressed, both electromagnet 12 and electromagnet 25 are closed. Spring 21 pushes the insertion rod 10 outward to the inner wall of the concrete well cylinder 2. Spring 317 pushes electromagnet 215. Electromagnet 215 drives the insertion piece 14 to be clamped on the inner wall of the concrete well cylinder 2. At this time, the insertion rod 10 and the insertion piece 14 are located on the inner wall of the top of the bottom of the concrete well cylinder 2. Then, the lifting rod 1 is slightly lifted upward. The insertion piece 14 is inserted into the gap of the concrete well cylinder 2, so that the connecting rod 16 presses the button 28, which can effectively position the gap of the concrete well cylinder 2 so as to accurately insert the insertion rod 10 into the gap of the concrete well cylinder 2, avoiding misalignment or inability to insert the insertion rod 10 into the gap of the concrete well cylinder 2, thereby improving the lifting efficiency of the concrete well cylinder 2.

[0029] In this embodiment, a piston 24 is fitted inside the sleeve 22, and a lead screw 25 is fitted inside the piston 24. The top end of the lead screw 25 is keyed to the output shaft of the motor 23, and the bottom end of the lead screw 25 passes through the piston 24 via a thread and is mounted on the inner wall of the bottom of the sleeve 22 via a bearing. The bottom of the sleeve 22 is connected to the inner side of the inclined sleeve 19 via a connecting pipe 26. An inclined rod 20 is fitted inside the inclined sleeve 19, and the top end of the inclined rod 20 passes through the inclined sleeve 19 and extends to the outer side of the inclined sleeve 19. On the side, the slide groove 27 is formed inside the clamping plate 21. The other end of the inclined rod 20 extends to the inside of the slide groove 27. The other end of the inclined rod 20 is connected to the inner wall of the slide groove 27 via a spring 28. The button 29 is installed inside the slide groove 27 by bolts. The first button 8 is connected to the first electromagnet 12 and the second electromagnet 15 via wires. The second button 18 is connected to the third button 29 via wires. The third button 29 is connected to the motor 23 via wires. The second button 18 turns on the motor 23. Motor 23 pushes piston 24 downward via lead screw 25. Hydraulic oil enters the inner side of inclined sleeve 19 through connecting pipe 26. Inclined rod 20 moves upward and clamps clamping plate 21 onto the inner wall of concrete shaft 2. After clamping plate 21 is clamped onto the inner wall of concrete shaft 2, clamping plate 21 stops moving. Inclined rod 20 slides in slide groove 27 and pushes clamping plate 21 upward. Clamping plate 21 lifts concrete shaft 2 upward. When inclined rod 20 presses against button 3 29, motor 23 is turned off, thus preventing damage caused by... Excessive pressure from the clamping plate 21 on the concrete well cylinder 2 could damage it. To ensure the safety of the concrete well cylinder 2, after the concrete well cylinder 2 is slightly pushed upwards, the insertion rod 10 is inserted into the bottom of the concrete well cylinder 2 and blocked by the stop block 13, preventing the insertion rod 10 from being inserted into the inner wall of the well body. This allows the concrete well cylinder 2 to be lifted upwards simultaneously through the pressure of the clamping plate 21 and the pulling of the insertion rod 10, ensuring both the fixation of the concrete well cylinder 2 and its safety.

[0030] This concrete well shaft lifting equipment is powered by an external power source. During operation, high-pressure air is introduced into the rubber ring 3 according to the well shaft's diameter, causing the rubber ring 3 to expand to be equal to or slightly smaller than the well shaft's inner diameter. The lifting rod 1 is then moved downwards through the top of the well shaft until the rubber ring 3 reaches the top of the concrete well shaft 2, causing the concrete well shaft to press upwards against the rubber ring 3. The rubber ring 3, through the cone plate 4, presses upwards against the outer sleeve 6. The outer sleeve 6, outside the inner sleeve 7, stretches the spring 7 and presses the button 8. At this point, the rubber ring 3 is completely locked at the top of the concrete well shaft 2. When lifting the concrete well shaft 2 upwards, the soil that has fallen off the inner wall of the well is caught by the cone plate 4 and the rubber ring 6. Ring 3 blocks and effectively prevents soil from falling to the bottom of the well, preventing a large amount of soil from interfering with the subsequent lifting of the concrete well cylinder 2, while ensuring the safe operation of the equipment at the bottom of the lifting rod 1. When button 1 8 is pressed, electromagnets 1 12 and 2 15 are both closed. Spring 2 11 pushes the insert rod 10 outward to the inner wall of the concrete well cylinder 2. Spring 3 17 pushes electromagnet 2 15, which in turn drives the insert plate 14 to lock onto the inner wall of the concrete well cylinder 2. At this time, the insert rod 10 and the insert plate 14 are both located on the inner wall of the top of the bottom of the concrete well cylinder 2. Then, the lifting rod 1 is slightly lifted upward, and the insert plate 14 is inserted into the gap of the concrete well cylinder 2, so that the continuous When rod 16 presses button 18, it effectively positions the gap in the concrete well shaft 2, ensuring precise insertion of the insertion rod 10 into the gap. This prevents misalignment or failure to insert the insertion rod 10 into the gap, thus improving the lifting efficiency of the concrete well shaft 2. Button 18 activates motor 23, which pushes piston 24 downwards via screw 25. Hydraulic oil enters the inner side of inclined sleeve 19 through connecting pipe 26, causing inclined rod 20 to move upwards and clamp plate 21 onto the inner wall of the concrete well shaft 2. Once clamp plate 21 is clamped onto the inner wall of the concrete well shaft 2, it stops moving, and inclined rod 20 slides in the groove. Slide the plate 21 upwards and push it inwards. The plate 21 lifts the concrete well cylinder 2 upwards. When the inclined rod 20 presses against the button 29, the motor 23 is turned off. This prevents damage to the concrete well cylinder 2 due to excessive pressure from the plate 21, ensuring the safety of the concrete well cylinder 2. After the concrete well cylinder 2 is slightly pushed upwards, the insertion rod 10 is inserted into the bottom of the concrete well cylinder 2 and blocked by the stop block 13, preventing the insertion rod 10 from being inserted into the inner wall of the well body. This allows the concrete well cylinder 2 to be lifted upwards simultaneously by the pressure of the plate 21 and the pulling of the insertion rod 10, ensuring both the fixation of the concrete well cylinder 2 and its safety.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A concrete well shaft lifting device, comprising a lifting rod and a concrete well shaft, characterized in that: A protective assembly is installed at the top of the lifting rod, including a rubber ring and a conical plate. A fixing assembly is installed at the bottom of the lifting rod, including a support sleeve and a plug rod. A limit component is installed on the plug rod, including an electromagnet and a stop. A positioning component is installed on the stop, including a insert and an electromagnet. A pushing assembly is installed on the lifting rod, including a slanted sleeve and a locking plate. A hydraulic assembly is installed on the top of the slanted sleeve, including a sleeve and a motor. A limit component is installed on the inner side of the locking plate, including a sliding groove and a button. An inner sleeve is threaded onto the top of the lifting rod via its outer side. A button is bolted to the top of the inner sleeve. The support sleeve is welded around the bottom of the lifting rod. Electromagnet is bolted to the inner side of the support sleeve. One end of the plug rod is connected to electromagnet through spring two. A connecting rod is welded to electromagnet two, and one end of the connecting rod passes through the stop and extends to... Inside the stop block, a second button is welded. The second button is located inside the other end of the connecting rod. A second electromagnet is connected to the stop block via a third spring. The second electromagnet is welded to the top of the insert. A piston is held inside the sleeve, and a lead screw is held inside the piston. The top of the lead screw is keyed to the output shaft of the motor. The bottom of the sleeve is connected to the inside of the inclined sleeve via a connecting pipe. An inclined rod is held inside the inclined sleeve. An outer sleeve is fitted on the outer side of the inner sleeve. The bottom is connected to the bottom of the inner sleeve via spring one. The rubber ring presses the outer sleeve upward through the cone plate. The outer sleeve stretches the spring one on the outside of the inner sleeve and presses the button one. When the button one is pressed, both electromagnet one and electromagnet two are closed. Spring two pushes the insert rod outward to the inner wall of the concrete well cylinder. The connecting rod presses the button two, and the button two turns on the motor. The motor pushes the piston downward through the screw. Hydraulic oil enters the inner side of the inclined sleeve through the connecting pipe. The inclined rod moves obliquely upward and clamps the clamping plate onto the inner wall of the concrete well cylinder.

2. The concrete shaft hoisting equipment according to claim 1, characterized in that: The rubber ring is secured to the top of the concrete well shaft, the bottom of the cone plate is bonded to the top of the rubber ring, and the top of the cone plate is bonded to the outer side of the outer casing.

3. A concrete shaft hoisting device according to claim 2, characterized in that: The other end of the insertion rod passes through the support sleeve and extends to the inner wall of the concrete well shaft, and the stop block is welded to the top of the other end of the insertion rod.

4. A concrete shaft hoisting device according to claim 3, characterized in that: The other end of the insertion rod has a slot at its top, and the insert is engaged inside the slot.

5. A concrete shaft hoisting device according to claim 1, characterized in that: The inclined sleeve is welded to the outer side of the lifting rod, the inclined sleeve is evenly distributed on the lifting rod, the inclined sleeve is located at the top of the support sleeve, the sleeve is welded to the outer side of the lifting rod, and the motor is installed on the top of the sleeve by bolts.

6. A concrete shaft hoisting device according to claim 5, characterized in that: The bottom end of the lead screw passes through the piston via a thread and is mounted on the inner wall of the bottom of the sleeve via a bearing.

7. A concrete shaft hoisting device according to claim 6, characterized in that: The top of the diagonal bar passes through the diagonal sleeve and extends to the outside of the diagonal sleeve.

8. A concrete shaft hoisting device according to claim 7, characterized in that: The slide is formed on the inner side of the card plate, and the other end of the inclined rod extends to the inner side of the slide. The other end of the inclined rod is connected to the inner wall of the slide through spring four, and button three is installed on the inner side of the slide by bolts.

9. A concrete shaft hoisting device according to claim 4, characterized in that: Button 1 is connected to electromagnets 1 and 2 via wires, button 2 is connected to button 3 via wires, and button 3 is connected to a motor via wires.

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