An automatic balance lifting tool

Abstract

The application discloses an automatic balance lifting tool and belongs to the technical field of lifting assembly. The automatic balance lifting tool solves the problem of difficulty in horizontal adjustment and balance of the tool when a sealing ring and a thrust washer of a man-made crystal autoclave in a limited space need to be horizontally lifted and installed. A lifting ring is arranged on a lifting rod, one end of the lifting rod is provided with telescopic legs and a first driving mechanism, the lifting rod is hingedly connected with a central support, the lifting rod is provided with a counterweight mechanism, a balance mechanism and an integrated circuit, the counterweight mechanism comprises a counterweight and a second driving mechanism, the balance mechanism comprises a displacement sensor and a sliding mechanism, the sliding mechanism comprises a sliding block and an automatic locking mechanism, and a diagonal bracing rod is hingedly connected between the sliding block and the central support. The automatic balance lifting tool is used for horizontally assembling a workpiece to be installed of a man-made crystal autoclave in a limited space, the integrated circuit controls linkage work of the telescopic legs, the counterweight mechanism and the balance mechanism, the lifting rod is automatically and accurately trimmed, the trimming efficiency is high, time and labor are saved, and safety is good.

Description

Technical Field

[0001] This invention belongs to the field of lifting and assembly technology, and more specifically, relates to an automatic balancing lifting fixture. Background Technology

[0002] Artificial crystal autoclaves are high-pressure reactors weighing several to tens of tons. The safe and precise assembly of these autoclaves has always been a challenge. When installing the sealing rings and thrust washers at both ends of the artificial crystal autoclave using a horizontal assembly method, the autoclave body is placed horizontally. Due to space constraints, vertical lifting with a gantry crane is not possible. Typically, a horizontal lifting method using a balancing hoist is required. However, ordinary balancing hoisting tools cannot automatically adjust the level, requiring operators to rely on experience to perform multiple counterweight adjustments and trial lifts. This method is time-consuming, labor-intensive, inefficient, costly, highly demanding on operator experience, and poses certain safety hazards. Summary of the Invention

[0003] The present invention provides an automatic balancing lifting fixture that automatically and accurately levels the lifting rod, with high balancing efficiency, saving time and effort, and ensuring good safety.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] This invention discloses an automatic balancing lifting fixture, comprising a boom with a lifting ring. One end of the boom is provided with a telescopic outrigger and a first drive mechanism for driving the telescopic outrigger to extend and retract. The boom is hinged to a central support, which is vertically opposite to the lifting ring. The boom is provided with a counterweight mechanism, a balancing mechanism, and an integrated circuit. The counterweight mechanism includes a counterweight and a second drive mechanism for reciprocating the counterweight along the length of the boom. The balancing mechanism includes a displacement sensor and a sliding mechanism. The sliding mechanism includes a slider and an automatic locking mechanism. The slider and the displacement sensor are arranged facing each other along the length of the boom. A diagonal brace is hinged between the slider and the central support. The power sources of the first drive mechanism, the second drive mechanism, and the automatic locking mechanism are electrically connected to the integrated circuit. The other end of the boom is provided with a mounting plate.

[0006] Furthermore, the telescopic outrigger is a U-shaped outrigger. The first and second arms of the U-shaped outrigger have vertical slots. The first drive mechanism includes a first motor. The output shaft of the first motor is fixedly mounted with a first crank arm. The tail end of the first motor is fixedly mounted with a second crank arm. A first connecting rod is provided between the first crank arm and the first arm of the U-shaped outrigger. The two ends of the first connecting rod are respectively hinged to the first crank arm and the first arm of the U-shaped outrigger. A second connecting rod is provided between the second crank arm and the second arm of the U-shaped outrigger. The two ends of the second connecting rod are respectively hinged to the second crank arm and the second arm of the U-shaped outrigger. A first screw is provided below the boom. The first screw is fitted with a first threaded sleeve. The side wall of the first threaded sleeve is provided with opposing first and second guide rods. The first guide rod and the second guide rod are slidably disposed in the slots of the corresponding first and second arms of the U-shaped outrigger.

[0007] Furthermore, the second drive mechanism includes a third motor, the output shaft of which is equipped with a third gear. The first screw is a hollow tubular structure, and a transmission spindle is rotatably sleeved inside the first screw. A fourth gear is fixedly installed at one end of the transmission spindle, and the third gear and the fourth gear mesh. A second threaded sleeve and a transmission spindle mounting seat are provided below the boom. The transmission spindle mounting seat has a transmission spindle mounting hole. The other end of the transmission spindle is fixedly inserted through the hollow second screw. The other end of the transmission spindle is fixedly passed through the second screw and rotatably connected in the transmission spindle mounting hole. The second screw spirally passes through the second threaded sleeve, and the counterweight is set on the second threaded sleeve.

[0008] Furthermore, two second threaded sleeve mounting seats are provided below the boom. The second threaded sleeve mounting seats have second threaded sleeve mounting holes. The second threaded sleeves are installed in the corresponding second threaded sleeve mounting seats. The second screw passes through the two second threaded sleeves in sequence.

[0009] Furthermore, the boom is equipped with a leg folding mechanism, which includes a second motor. The output shaft of the second motor is fixedly equipped with a first gear. A first screw mounting seat for mounting the first screw is provided below the boom. The first screw mounting seat has a first screw mounting hole. A second gear is provided at one end of the first screw. The first gear meshes with the second gear. The other end of the first screw spirally passes through the first screw sleeve and is rotatably connected in the first screw mounting hole.

[0010] Furthermore, a first screw mounting bearing is provided in the first screw mounting hole, and the other end of the first screw is spirally passed through the first screw sleeve and fixedly connected in the first screw mounting bearing. A transmission spindle mounting bearing is provided in the transmission spindle mounting hole, and the other end of the transmission spindle is fixedly passed through the second screw and fixedly connected in the transmission spindle mounting bearing.

[0011] Furthermore, a partition is provided between the first gear and the third gear, the second motor is located below the third motor, and a fifth gear meshes between the third gear and the fourth gear. The partition has an output shaft hole of the first motor, a shaft hole of the fifth gear, and a transmission spindle hole. The output shaft of the first motor, the gear shaft of the fifth gear, and the transmission spindle are respectively rotatably disposed in the corresponding output shaft hole of the first motor, the shaft hole of the fifth gear, and the shaft hole of the transmission spindle on the partition.

[0012] Furthermore, the displacement sensor is a magnetostrictive displacement sensor, and the automatic locking mechanism includes a toothed clip and an electromagnet. The magnetostrictive displacement sensor and the electromagnet are fixedly mounted on the rod. A connecting hole is provided on the back side of the toothed clip, and the electromagnet is provided with a connecting rod. The free end of the connecting rod is slidably connected in the connecting hole. A spring is sleeved on the connecting rod, and the spring is located between the toothed clip and the electromagnet. The slider is provided with a serrated structure that cooperates with the toothed clip. The serrated structure of the slider is arranged facing the toothed side of the toothed clip. The slider is provided with a through hole, and the measuring rod of the magnetostrictive displacement sensor slides through the through hole.

[0013] Furthermore, the bottom surface of the boom is provided with a mounting plate, and the mounting plate is provided with two opposing L-shaped guide plates. The two L-shaped guide plates and the mounting plate respectively form a U-shaped first guide rail and a second guide rail. The slider is provided with a guide strip on the side facing away from the sawtooth structure. The guide strip of the slider is slidably connected in the first guide rail. The toothed clip is provided in the second guide rail. The distance between the back side of the toothed clip and the bottom surface of the second guide rail is greater than the tooth height of the toothed clip.

[0014] Furthermore, the top of the boom is provided with a longitudinal tie rod and a diagonal tie rod, the lifting ring is provided at the top of the longitudinal tie rod, the central support is hinged to the bottom of the boom, the longitudinal tie rod is arranged opposite to the central support, and the two ends of the diagonal tie rod are respectively connected to the top surface of the boom and the upper end of the longitudinal tie rod.

[0015] The beneficial effects of this invention are:

[0016] This application provides an automatic balancing lifting fixture for horizontal lifting and assembly of an artificial crystal autoclave in confined spaces. When using the automatic balancing lifting fixture, it is placed on a horizontal surface. The telescopic outriggers and central support support the lifting rod. The displacement sensor is at zero position. The integrated circuit is powered on, and the integrated circuit's control system instructs the first drive mechanism to extend the telescopic outriggers downwards to their maximum position, where they rest against the horizontal surface. The integrated circuit's control system then instructs the first drive mechanism to stop, and the lifting rod is in a horizontal state. The integrated circuit's control system then instructs the second drive mechanism to move the counterweight towards its initial position (e.g., the leftmost end). Once the counterweight reaches its initial position (e.g., the leftmost end), the integrated circuit's control system instructs the second drive mechanism to stop. The workpiece to be installed is then mounted on the mounting plate of the lifting rod. The integrated circuit's control system instructs the automatic locking mechanism to unlock. The integrated circuit's control system then instructs the first drive mechanism to retract the telescopic outriggers. Because the central support is hinged to the lifting rod, the counterweight moves to its initial position. Position (e.g., the leftmost end). During this process, the boom is no longer horizontal and tilts towards the direction of the telescopic outriggers (left end). The boom is in an inclined state, and the diagonal brace is hinged between the slider and the central support. The distance between the displacement sensor and the slider increases, and the displacement sensor detects information. The displacement sensor provides a continuous electrical signal to the integrated circuit, transmitting the detected information to the integrated circuit. At the same time, the integrated circuit's control system instructs the second drive mechanism to work, driving the counterweight to move towards the balance position (e.g., the right end). The boom gradually tilts to the right, and the distance between the displacement sensor and the slider decreases. According to the lever balance principle, the boom returns to a horizontal state. At this time, the telescopic outriggers are completely off the ground, and the displacement sensor returns to zero. The integrated circuit's control system instructs the first and second drive mechanisms to stop working, and the integrated circuit's control system instructs the automatic locking mechanism to work and lock. The boom completes automatic balance. The gantry crane lifts and assembles the corresponding workpieces through the lifting rings. This automatic balancing lifting fixture features automatic and precise balancing, eliminating the need for manual balancing based on experience. It boasts high balancing efficiency, saves time and labor, and offers excellent safety. It is particularly suitable for the horizontal lifting and assembly of sealing rings and thrust washers for artificial crystal autoclaves in confined spaces. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the automatic balancing lifting fixture provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A magnified view of part A;

[0020] Figure 3 This is an assembly drawing of the first screw sleeve and the first screw provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the central support and balancing mechanism provided in an embodiment of the present invention. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the central support and balancing mechanism provided in an embodiment of the present invention. Figure 2 ;

[0023] Figure 6 This is a schematic diagram of the central support and balancing mechanism provided in an embodiment of the present invention. Figure 3 ;

[0024] Figure 7 This is a schematic diagram of the structure of the automatic balancing lifting fixture with a cover provided in an embodiment of the present invention.

[0025] Figure label:

[0026] 1. Lifting rod, 2. Second screw, 3. First screw, 4. Second guide rod, 5. U-shaped support leg, 51. First leg arm, 52. Second leg arm, 53. Slot, 6. Second gear, 7. Fourth gear, 8. Second motor, 9. Partition plate, 10. First gear, 11. Fifth gear, 12. Third gear, 13. Third motor, 14. First motor, 15. Second crank arm, 16. Second connecting rod, 17. Central support, 18. Transmission spindle mounting seat, 19. Second screw sleeve mounting seat, 20. Counterweight, 21. Diagonal tie rod, 22. Lifting ring, 23. Longitudinal tie rod, 24. Mounting plate, 25. Cover plate, 26. Diagonal brace, 27. Slider, 28. Measuring rod, 29. Electromagnet, 30. Spring, 31. Connecting rod, 32. Toothed clip, 33. Magnetostrictive displacement sensor, 34. Battery, 35. First screw sleeve, 36. Mounting plate, 37. L-shaped guide plate, 38. Cover, 39. First screw mounting seat, 40. Transmission spindle, 41. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, this embodiment provides an automatic balancing lifting fixture, including a horizontally placed lifting rod 1. The lifting rod 1 is equipped with a lifting ring 23. One end of the lifting rod 1 is equipped with a telescopic outrigger and a first drive mechanism for driving the telescopic outrigger to extend and retract. The lifting rod 1 is hinged to a central support 17, which is vertically opposite to the lifting ring 23. The lifting rod 1 is equipped with a counterweight mechanism, a balancing mechanism, and an integrated circuit. The counterweight mechanism includes a counterweight 20 and a second drive mechanism that drives the counterweight 20 to reciprocate back and forth along the length direction of the lifting rod 1. The balancing mechanism includes a displacement sensor and a sliding mechanism. The sliding mechanism includes a slider 28 and an automatic locking mechanism. The slider 28 and the displacement sensor are arranged facing each other along the length direction of the lifting rod 1. A diagonal brace 27 is hinged between the slider and the central support 17. The power sources of the first drive mechanism, the second drive mechanism, and the automatic locking mechanism are electrically connected to the integrated circuit. The other end of the lifting rod 1 is equipped with a mounting plate 25. The counterweight 20 is located between the telescopic outrigger and the central support 17. The displacement sensor and slider 28 are arranged facing each other along the length of the boom 1. The detection end of the displacement sensor faces the slider 28. The slider 28 slides towards or away from the displacement sensor along the length of the boom 1. The displacement sensor and slider 28 are located at the bottom of the boom 1, with the displacement sensor located to the left of the slider 28. The mounting plate 25 is welded to the right end of the boom 1. Holes for mounting the workpiece are evenly drilled around the perimeter of the mounting plate 25. The central support 17 is hinged to the bottom of the boom 1 near the mounting plate 25. The hinge can be achieved using existing hinge seats, pins, and pin hole structures. Hinges are welded to the corresponding positions of the boom 1, central support 17, and slider 28. The telescopic outriggers are telescopically extended by a hydraulic cylinder, a pneumatic cylinder, or a crank-slider mechanism. The first and second drive mechanisms can be driven by a motor and belt / pulley, a motor and gear, or a motor and rack and pinion. The motor and integrated circuit can be powered by an external power supply or a battery 35. The automatic locking mechanism can be selected from threaded or gear engagement locking or magnetic snap-locking locking.

[0030] An automatic balancing lifting fixture based on the above structure is used for the horizontal lifting and assembly of an artificial crystal autoclave in a confined space. When using the automatic balancing lifting fixture, it is placed on a horizontal surface. The telescopic outriggers and the central support 17 support the lifting rod 1. The displacement sensor is at zero position. The integrated circuit is powered on, and the integrated circuit's control system instructs the first drive mechanism to extend the telescopic outriggers downwards to their maximum position, where they rest against the horizontal surface. The integrated circuit's control system then instructs the first drive mechanism to stop, and the lifting rod 1 is in a horizontal state. The integrated circuit's control system then instructs the second drive mechanism to move the counterweight 20 towards its initial position (e.g., the leftmost end). Once the counterweight 20 reaches its initial position (e.g., the leftmost end), the integrated circuit's control system instructs the second drive mechanism to stop. The workpiece to be installed is then mounted on the mounting plate 25 of the lifting rod. The integrated circuit's control system instructs the automatic locking mechanism to unlock. The integrated circuit's control system then instructs the first drive mechanism to retract the telescopic outriggers. Because the central support 17 is hinged to the lifting rod 1, the counterweight 20 moves to its initial position. (As shown at the far left) During this process, boom 1 is no longer horizontal and tilts towards the direction of the telescopic outrigger (left end). Boom 1 is in an inclined state, and the diagonal brace 27 is hinged between the slider 28 and the central support 17. The distance between the displacement sensor and the slider 28 increases, and the displacement sensor detects information. The displacement sensor provides a continuous electrical signal to the integrated circuit and transmits the detected information to the integrated circuit. At the same time, the integrated circuit's control system instructs the second drive mechanism to work and drive the counterweight 20 to move towards the balance position (as shown at the right end). Boom 1 gradually tilts to the right, and the distance between the displacement sensor and the slider 28 decreases. According to the lever balance principle, boom 1 tends to return to a horizontal state. At this time, the telescopic outrigger is completely off the ground, the displacement sensor is back to zero, the integrated circuit's control system instructs the first drive mechanism and the second drive mechanism to stop working, and the integrated circuit's control system instructs the automatic locking mechanism to work and lock. Boom 1 completes automatic balance. The gantry crane lifts and assembles the corresponding workpieces through the lifting ring 23. This automatic balancing lifting fixture features automatic and precise balancing, eliminating the need for manual balancing based on experience. It boasts high balancing efficiency, saves time and labor, and offers excellent safety. It is particularly suitable for the horizontal lifting and assembly of sealing rings and thrust washers for artificial crystal autoclaves in confined spaces.

[0031] As one possible implementation method, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the telescopic outrigger is a U-shaped outrigger 5. The first arm 51 and the second arm 52 of the U-shaped outrigger 5 have vertical slots 53. The first drive mechanism includes a first motor 14. The output shaft of the first motor 14 is fixedly fitted with a first crank arm, and the tail end of the first motor 14 is fixedly fitted with a second crank arm 15. A first connecting rod is provided between the first crank arm and the first arm 51 of the U-shaped outrigger 5. The two ends of the first connecting rod are respectively hinged to the first crank arm and the first arm 51 of the U-shaped outrigger 5. The second crank arm 15 and... A second connecting rod 16 is provided between the second leg arms 52 of the U-shaped support leg 5. The two ends of the second connecting rod 16 are hinged to the second crank arm 15 and the second leg arm 52 of the U-shaped support leg 5, respectively. A first screw 3 is provided below the suspension rod 1. A first threaded sleeve 36 is fitted onto the first screw 3. The side wall of the first threaded sleeve 36 is provided with opposing first guide rods and second guide rods 4. The first guide rods and second guide rods 4 are slidably disposed within the slots 53 of the corresponding first leg arms 51 and second leg arms 52 of the U-shaped support leg 5. The slots 53 are arranged along the length direction of the first leg arms 51 and second leg arms 52 of the U-shaped support leg 5, and the slots 53 of the first leg arms 51 and second leg arms 52 are arranged opposite each other. The distance between the first leg arm 51 and the second leg arm 52 of the U-shaped outrigger 5 is greater than the width of the boom 1. The boom 1 is positioned between the first leg arm 51 and the second leg arm 52 of the U-shaped outrigger 5. There is a gap between the first leg arm 51, the second leg arm 52 and the boom 1 to facilitate the raising and lowering of the U-shaped outrigger 5. The first crank arm and the second crank arm 15 are arranged opposite each other, and the first connecting rod and the second connecting rod 16 are arranged. The hinge method can adopt the existing art hinge seat, pin, and pin hole structure. Pins are welded to the lower end of the first crank arm, the upper end of the first leg arm 51 of the U-shaped support leg 5, the lower end of the second crank arm 15, and the upper end of the second leg arm 52 of the U-shaped support leg 5. Pin holes are opened at both ends of the first connecting rod and the second connecting rod 16. An annular retaining spring groove is opened on the side wall of the outer end (the other end of the welded end) of the corresponding pin. After the first connecting rod and the second connecting rod 16 are rotatably installed on the corresponding pins, retaining springs are locked in the retaining spring grooves to prevent the first connecting rod and the second connecting rod 16 from falling off. There is a gap between the first connecting rod and the first crank arm and the first leg arm 51 of the U-shaped support leg 5, and there is a gap between the second connecting rod 16 and the second crank arm 15 and the second leg arm 52 of the U-shaped support leg 5. The upper end of the first crank arm has an opening, the output shaft of the first motor 14 is interference-fitted with the opening at the upper end of the first crank arm, the tail end of the first motor 14 is welded with a pin, the upper end of the second crank arm 15 has a shaft hole, and the pin at the tail end of the first motor 14 is interference-fitted with the shaft hole at the upper end of the second crank arm 15.

[0032] The second drive mechanism includes a third motor 13, the output shaft of which is equipped with a third gear 12. The first screw 3 is a hollow tubular structure, and a transmission spindle 41 is rotatably sleeved inside the first screw 3. A fourth gear 7 is fixedly mounted on one end of the transmission spindle 41, and the third gear 12 and the fourth gear 7 mesh. A second threaded sleeve and a transmission spindle mounting seat 18 are provided below the boom 1. The transmission spindle mounting seat 18 has a transmission spindle mounting hole. The other end of the transmission spindle 41 is fixedly inserted through a hollow second screw 2, which is rotatably connected to the transmission spindle mounting hole. The second screw 2 spirally passes through the second threaded sleeve. The counterweight 20 is mounted on the second threaded sleeve. The transmission spindle 41, the first screw 3, and the second screw 2 are coaxial, and there is a gap between the outer wall of the transmission spindle 41 and the inner wall of the first screw 3. One end of the transmission spindle 41 can be connected to the fourth gear 7 by a key, and the other end of the transmission spindle 41 (such as the right end) is sleeved in the second screw 2 and can be fixed by a set screw or a key connection.

[0033] The boom 1 is equipped with a leg folding mechanism, which includes a second motor 8. A first gear 10 is fixedly mounted on the output shaft of the second motor 8. A first screw mounting seat 40 is located below the boom 1, housing the first screw 3. The first screw mounting seat 40 has a first screw mounting hole. A second gear 6 is mounted at one end of the first screw 3, meshing with the first gear 10. The other end of the first screw 3 spirally passes through the first screw sleeve 36 and is rotatably connected within the first screw mounting hole. The first screw 3 and the second gear 6 can be connected by a key. The length of the first screw 3 allows the U-shaped leg 5 to fold horizontally. The length of the second screw 2 allows the second screw sleeve to drive the counterweight 20 to move left and right along the length of the second screw 2 during the automatic balancing process, enabling the boom 1 to achieve a horizontal balance.

[0034] The displacement sensor is a magnetostrictive displacement sensor 34. The automatic locking mechanism includes a toothed clip 33 and an electromagnet 30. The magnetostrictive displacement sensor 34 and the electromagnet 30 are fixedly mounted on the rod 1. A connecting hole is provided on the back side of the toothed clip 33. The electromagnet 30 is provided with a connecting rod 32. The free end of the connecting rod 32 is slidably connected in the connecting hole. A spring 31 is sleeved on the connecting rod 32. The spring 31 is located between the toothed clip 33 and the electromagnet 30. The slider 28 is provided with a serrated structure that cooperates with the toothed clip 33. The serrated structure of the slider 28 is arranged facing the toothed side of the toothed clip 33. The slider 28 is provided with a through hole. The measuring rod 29 of the magnetostrictive displacement sensor 34 slides through the through hole. The magnetostrictive displacement sensor 34 and the electromagnet 30 can be fixedly installed at the bottom of the rod 1 near the central support 17 using screws. There is at least one electromagnet 30, such as two electromagnets 30 arranged along the length of the toothed clip 33, evenly installed on the back side of the toothed clip 33 (the side opposite to the toothed side of the toothed clip 33). A connecting rod 32 is welded to the end of the electromagnet 30 facing the toothed clip 33. The free end of the connecting rod 32 is the other end of the connecting rod 32 that is fixedly connected to the electromagnet 30. The outer diameter of the spring 31 is larger than the inner diameter of the connecting hole in the toothed clip 33. A through hole is drilled along the length of the slider 28.

[0035] The boom 1 is equipped with a battery 35, and the integrated circuit is equipped with an initialization button and an automatic balancing button. The integrated circuit, the electromagnet 30, the magnetostrictive displacement sensor 34, the first motor 14, the second motor 8, and the third motor 13 are all electrically connected to the battery 35 via wires. The battery 35 supplies power to the integrated circuit, electromagnet 30, magnetostrictive displacement sensor 34, first motor 14, second motor 8, and third motor 13, improving adaptability. The integrated circuit receives electrical signals from the magnetostrictive displacement sensor 34 and sends work / stop commands to the electromagnet 30, first motor 14, second motor 8, and third motor 13. The electrical connections between the various electrical components can adopt existing technologies and solutions.

[0036] The first motor 14, the first crank arm, the second crank arm 15, the first connecting rod, the second connecting rod 16, the first threaded sleeve 36, the first guide rod, the second guide rod 4, and the U-shaped support leg 5 constitute the support leg telescopic mechanism of the crank-slider mechanism. The second motor 8, the first gear 10, the second gear 6, the first threaded sleeve 36, and the first screw 3 constitute the support leg folding mechanism. The third motor 13, the third gear 12, the fourth gear 7, the transmission spindle 41, the second screw 2, the second threaded sleeve, and the counterweight 20 constitute the counterweight mechanism. The magnetostrictive displacement sensor 34, the toothed clip 33, the slider 28, the electromagnet 30, the central support 17, the diagonal brace 27, the connecting rod 32, and the spring 31 constitute the balancing mechanism. Working principle of the automatic balancing lifting fixture: When using the automatic balancing lifting fixture, place the fixture on a horizontal surface. The U-shaped outriggers 5 and the central support 17 support the boom 1. The magnetostrictive displacement sensor 34 is at zero position. Pressing the initialization button of the integrated circuit, the integrated circuit control system commands the second motor 8 to start working. The second motor 8 rotates in reverse, driving the first gear 10 to rotate, which in turn drives the second gear 6 meshing with the first gear 10 to rotate, driving the first screw 3 to rotate, causing the first screw sleeve 36 to move to the left, and causing the U-shaped outriggers 5 to rotate downwards. 36 moves to the leftmost position of the first screw 3, the U-shaped support leg 5 is in a vertical position, and the integrated circuit control system commands the second motor 8 to stop working; the integrated circuit control system commands the first motor 14 to start working, the first motor 14 rotates in the opposite direction, driving the first crank arm and the second crank arm 15 to rotate downwards, driving the first connecting rod and the second connecting rod 16 to rotate downwards, driving the U-shaped support leg 5 to move downwards, the U-shaped support leg 5 descends, the first guide rod and the second guide rod 16 abut against the upper inner wall of the slot 53 of the first leg arm 51 and the second leg arm 51, the U-shaped support leg 5 descends to the maximum position. The U-shaped outrigger 5 contacts the horizontal ground for support; the integrated circuit control system commands the first motor 14 to stop working, and the boom 1 is in a horizontal state. The integrated circuit control system commands the third motor 13 to start working, and the third motor 13 rotates in the reverse direction, driving the third gear 12 to rotate, driving the fourth gear 7 meshing with the third gear 12 to rotate, driving the transmission spindle 41 to rotate, driving the second screw 2 fixed to the transmission spindle 41 to rotate, driving the second screw sleeve to move towards the initial position (such as the leftmost end), driving the counterweight 20 to move towards the initial position (such as the leftmost end), and the counterweight 20... Move to the initial position (e.g., the leftmost end), the integrated circuit control system instructs the third motor 13 to stop working; install the workpiece to be installed on the mounting plate 25 of the lifting rod; press the automatic balancing button of the integrated circuit, the integrated circuit control system instructs the electromagnet 30 to activate, the electromagnet 30 generates magnetic force to pull back the toothed clip 33, the spring 31 is compressed and stored energy, the toothed clip 33 separates from the sawtooth structure of the slider 28, the integrated circuit control system instructs the first motor 14 to start working, the first motor 14 rotates forward, driving the first crank arm and the second crank arm 15 to rotate upward.The first and second connecting rods 16 rotate upwards, causing the U-shaped support leg 5 to move upwards. The U-shaped support leg 5 rises, and the central support 17 hinges to the hanging rod 1. During this process, the torques of the hanging rods 1 on both sides of the central support 17 are unequal; the torque of the hanging rod 1 on the left side of the central support 17 is greater than that on the right side. According to the lever principle, the hanging rod 1 is no longer horizontal and tilts towards the direction of the U-shaped support leg 5 (left end). The hanging rod 1 is in an inclined state, and the diagonal brace 27 is hinged between the slider 28 and the central support 17. The measuring rod 29 of the magnetostrictive displacement sensor 34 slides through the through hole of the slider 28. The hanging rod 1 tilts towards the U-shaped support leg 5. The tilting of support leg 5 (left end) causes slider 28 to slide away from U-shaped support leg 5 (right end), increasing the distance between magnetostrictive displacement sensor 34 and slider 28. Magnetostrictive displacement sensor 34 detects this information and provides a continuous electrical signal to the integrated circuit, transmitting the detected information. Simultaneously, the integrated circuit's control system instructs the third motor 13 to start operating. The third motor 13 rotates forward, driving the third gear 12 to rotate, which in turn drives the fourth gear 7 meshing with the third gear 12 to rotate, causing the transmission spindle 41 to rotate, which in turn drives the second screw 2 to rotate, causing the second screw sleeve to move towards the equilibrium position (as shown on the right). The end of the lever moves, causing the counterweight 20 to slowly move towards the balance position (such as the right end). The boom 1 gradually tilts to the right, causing the slider 28 to slide towards the U-shaped support leg 5 (left end). The distance between the magnetostrictive displacement sensor 34 and the slider 28 decreases. According to the lever balance principle, the torque of the boom 1 on the left side of the central support 17 is equal to the torque of the boom 1 on the right side of the central support 17. The boom 1 returns to a horizontal state. At this time, the U-shaped support leg 5 is completely off the ground, the magnetostrictive displacement sensor 34 is back to zero, the integrated circuit control system commands the first motor 14 and the third motor 13 to stop working, and the integrated circuit control system commands the electromagnet 30 to disconnect. Spring 31 releases its stored elastic potential energy, pushing the toothed locking bar 33 towards the slider 28. The toothed locking bar 33 then resets and engages with the serrated structure of the slider 28, completing automatic balancing. The integrated circuit control system instructs the second motor 8 to start working. The second motor 8 rotates forward, driving the first gear 10 to rotate, which in turn drives the second gear 6 meshing with the first gear 10 to rotate, driving the first screw 3 to rotate, causing the first screw sleeve 36 to move to the right, and causing the U-shaped support leg 5 to rotate upward. The U-shaped support leg 5 folds up to avoid interference. The integrated circuit control system instructs the second motor 8 to stop working. The gantry crane then lifts the workpiece via the lifting ring 23 and performs the corresponding workpiece assembly. This automatic balancing lifting fixture has an automatic balancing function, eliminating the need for manual balancing based on experience. It offers high balancing efficiency, saves time and effort, and ensures good safety. A magnetostrictive displacement sensor 34 acts as the "eyes," sensing the balance state of the boom 1 in real time. This automatic balancing lifting fixture uses an integrated circuit as its "brain."It processes information and issues decision commands; using the outrigger extension mechanism, outrigger folding mechanism, counterweight mechanism and balancing mechanism as "hands and feet", it performs leveling action on the boom 1. The whole process realizes fully automatic closed-loop control from "initial unlocking" to "dynamic leveling" and then to "balance locking", without manual intervention, thus significantly improving the safety, efficiency and reliability of the operation. It is especially suitable for the horizontal lifting and installation of artificial crystal high pressure vessel sealing rings and thrust washers in confined spaces where vertical lifting and assembly cannot be carried out by gantry crane. In this process, the integrated circuit utilizes existing technologies and solutions. For example, after receiving the distance deviation signal between the magnetostrictive displacement sensor 34 and the slider 28, the integrated circuit's control system performs PID (proportional-integral-derivative) or other control algorithm calculations to determine the required direction, speed, and distance of movement of the counterweight 20 to eliminate the deviation. Based on the calculation results, the integrated circuit's control system sends a command to the third motor 13 of the counterweight mechanism. The output shaft of the third motor 13 drives the third gear 12 to rotate, which in turn drives the fourth gear 7 to rotate, which in turn drives the transmission spindle 41 to rotate, which in turn drives the second screw 2 to rotate, which in turn drives the second screw sleeve to rotate and move along the axial direction of the second screw 2, thus pushing the counterweight 20 to move and change the torque on one side of the counterweight 20.

[0037] The first motor 14, the second motor 8, and the third motor 13 are bolted to the boom 1, which is a hollow rod. The first motor 14 and the third motor 13 are mounted on the top left end of the boom 1, while the second motor 8 is mounted inside the left end of the boom 1. To facilitate the installation of the second motor 8, holes are made on the front and rear sides of the left end of the boom 1. The output shaft of the second motor 8 is connected to the first gear 10 via a key, and the output shaft of the third motor 13 is connected to the third gear 12 via a key.

[0038] As one possible implementation, a remote control is also included, which is equipped with an initialization remote control button, an automatic balancing remote control button, and an infrared transmitter. The boom 1 is equipped with an infrared receiver that is wirelessly connected to the infrared transmitter, and the infrared receiver is electrically connected to the integrated circuit.

[0039] Pressing the initialization button on the remote control activates the first motor, instructing the U-shaped support leg 5 to rise to its highest point. The first motor then stops. The third motor 13 activates, moving the counterweight 20 to its initial position (e.g., the leftmost end). The third motor 13 then stops, allowing sufficient adjustment travel for subsequent balancing. After the assembly workpiece is installed on the mounting plate 25, pressing the automatic balancing button on the remote control activates the electromagnet 30. The electromagnet 30 generates magnetic force, pulling the toothed clip 33 back and separating it from the serrated structure of the slider. The boom 1 rotates to the left, tilting. The first motor activates, causing the U-shaped support leg 5 to descend. The third motor 13 activates, moving the counterweight 20 to the right. The boom 1 returns to a horizontal position. The electromagnet 30 disengages, and the toothed clip 33 resets and engages with the serrated structure of the slider, completing automatic balancing. Wireless control via the remote control facilitates remote operation.

[0040] As one possible implementation method, such as Figure 4 , Figure 5 , Figure 6 As shown, the bottom surface of the boom 1 is provided with a mounting plate 37, and the mounting plate 37 is provided with two opposing L-shaped guide plates 38. The two L-shaped guide plates 38 and the mounting plate 37 respectively form a U-shaped first guide rail and a second guide rail. The slider 28 is provided with a guide strip on the side facing away from the sawtooth structure. The guide strip of the slider 28 is slidably connected in the first guide rail. The toothed clip 33 is provided in the second guide rail. The distance between the back side of the toothed clip 33 and the bottom surface of the second guide rail is greater than the tooth height of the toothed clip 33.

[0041] The back end of the toothed clip 33 is located within the second guide rail composed of the L-shaped guide plate 38 and the mounting plate 37, serving a protective function. The guide strip of the slider 28 is slidably connected within the first guide rail composed of the L-shaped guide plate 38 and the mounting plate 37, serving both guiding and protective functions. The distance between the back end of the toothed clip 33 and the bottom surface of the second guide rail is greater than the tooth height of the toothed clip 33. During the process of the electromagnet 30 generating magnetic force to pull the toothed clip 33 back, it ensures that the toothed clip 33 separates from the sawtooth structure of the slider 28. The electromagnet 30 is located on the outer side of the bottom surface of the second guide rail. A connecting rod through hole is opened on the bottom surface of the second guide rail. The free end of the connecting rod 32 passes through the connecting rod through hole and is slidably connected to the connecting hole drilled on the back end of the toothed clip 33. The spring 31 is located between the toothed clip 33 and the bottom surface of the second guide rail, and the outer diameter of the spring 31 is greater than the inner diameter of the connecting rod through hole.

[0042] As one possible implementation method, such as Figure 1 , Figure 2As shown, a first screw mounting bearing is provided in the first screw mounting hole, and the other end of the first screw 3 is screwed through the first screw sleeve 36 and fixedly connected in the first screw mounting bearing. A transmission spindle mounting bearing is provided in the transmission spindle mounting hole, and the other end of the transmission spindle 41 is fixedly connected in the transmission spindle mounting bearing by passing through the second screw 2.

[0043] The first screw 3 is interference-fitted or keyed and installed in the first screw mounting bearing. The first screw 3 is rotatably connected to the first screw mounting hole of the first screw mounting seat 40 through the first screw mounting bearing. The transmission spindle 41 is interference-fitted and fixedly installed in the transmission spindle mounting bearing. The transmission spindle 41 is rotatably connected to the transmission spindle mounting hole of the transmission spindle mounting seat 18 through the transmission spindle mounting bearing. The bearing can reduce frictional resistance, make rotation smoother, reduce energy loss, extend service life, stabilize rotation, reduce vibration and off-center load, and improve the overall performance of the tooling. A second first screw mounting seat 40 is welded to the bottom of the lifting rod 1 near the position of the second gear 6. The second first screw mounting seat 40 has a first screw mounting hole. The first screw mounting bearing is interference-fitted and fixedly installed in the first screw mounting hole. The two first screw mounting bearings support the two ends of the first screw 3, so that the first screw 3 rotates smoothly and improves the stability of the tooling. A first screw mounting hole is opened at the left end of the first screw mounting seat 40 near the second screw 2, and a transmission spindle mounting hole is opened at the right end (the end near the second screw 2). The transmission spindle mounting bearing is installed in the transmission spindle mounting hole with an interference fit. The transmission spindle 41 is supported and installed by the two transmission spindle mounting bearings, so that the transmission spindle 41 can rotate smoothly and further improve the stability of the tooling.

[0044] As one possible implementation method, such as Figure 1 , Figure 2 As shown, a partition 9 is provided between the first gear 10 and the third gear 12. The second motor 8 is located below the third motor 13. A fifth gear 11 meshes between the third gear 12 and the fourth gear 7. The partition 9 has an output shaft hole of the first motor 14, a fifth gear shaft hole, and a transmission spindle shaft hole. The output shaft of the first motor 14, the gear shaft of the fifth gear 11, and the transmission spindle 41 are respectively rotatably disposed in the corresponding output shaft hole of the first motor 14, the fifth gear shaft hole, and the transmission spindle shaft hole of the partition 9.

[0045] The meshing transmission of the two large gears, the third gear 12 and the fourth gear 7, is replaced with a meshing transmission of three small gears. This three-small-gear transmission allows for a more complex transmission layout through the intermediate gear, reducing the overall size while maintaining the same transmission ratio. It allows for a smaller footprint, a more compact structure, and provides a larger transmission ratio, ensuring stable and precise transmission, smooth movement of the counterweight mechanism, and improved boom balance. The partition 9 is used to install and support the fifth gear 11.

[0046] As one possible implementation method, such as Figure 1 , Figure 2 , Figure 7 As shown, the boom 1 is provided with a cover 39, and the first gear 10, the second gear 6, the third gear 12, the fourth gear 7, and the fifth gear 11 are disposed inside the cover 39.

[0047] The cover 39 is used to prevent dust, impurities, and moisture from entering the gear transmission area, protecting the gears, extending their service life, and ensuring normal equipment operation. It forms a barrier around the gears, preventing personnel from contacting them, reducing the risk of mechanical injuries such as pinching and entanglement, and ensuring personnel safety. The cover 39, after covering the first gear 10, second gear 6, third gear 12, fourth gear 7, and fifth gear 11, can be bolted to the end of the boom 1.

[0048] As one possible implementation method, such as Figure 4 , Figure 5 , Figure 6 As shown, the central support 17 has a mounting groove, the battery 35 is installed in the mounting groove of the central support 17, and the mounting groove is provided with a cover plate 26.

[0049] The central support 17 has a mounting slot for supporting and installing the battery 35. The battery 35 is placed in the mounting slot of the central support 17, and a cover plate 26 is placed on top to protect the battery 35. Baffles can be provided on the upper, left, and right edges of the cover plate 26. The cover plate 26 covers the central support 17, with the baffle on the upper edge of the cover plate 26 abutting against the outer upper wall of the central support 17, and the baffles on the left and right edges of the cover plate 26 abutting against the outer left and right edges of the central support 17, respectively. The cover plate 26 has multiple evenly spaced ventilation slots along its length, providing a heat dissipation channel for the battery 35.

[0050] As one possible implementation method, such as Figure 1 , Figure 7 As shown, the counterweight 20 is composed of a plurality of identical counterweight blocks 21.

[0051] The counterweight 20 consists of multiple identical square counterweight blocks 21, such as two, three, four, five, or six counterweight blocks 21. The counterweight blocks 21 are installed in a counterweight box, which is divided into multiple compartments by partitions. Each compartment corresponds to one counterweight block 21, and the counterweight blocks 21 are secured within their respective compartments. Fixing plates are welded to the left and right edges of the counterweight box, facing each other. Holes are drilled in the fixing plates, and bolts pass through them. Nuts are threaded onto the bolts. Connecting blocks are installed on the outer side of each counterweight block 21, with connecting holes drilled in them to mate with the bolts. When installing the counterweight blocks 21, they are placed within a compartment of the counterweight box, the bolts pass through the connecting holes in the counterweight blocks 21, and the nuts are tightened. The counterweight blocks 21 are securely installed within the counterweight box. The weight of the counterweight is adjusted by increasing or decreasing the number of counterweight blocks 21. The structure is simple, adjustment is convenient, and it is flexible and convenient to use when the counterweight position is adjustable.

[0052] As one possible implementation method, such as Figure 1 , Figure 2 , Figure 7 As shown, two second threaded sleeve mounting seats 19 are provided below the boom 1. The second threaded sleeve mounting seats 19 have second threaded sleeve mounting holes. The second threaded sleeves are set in the corresponding second threaded sleeve mounting seats 19. The second screw 2 passes through the two second threaded sleeves in sequence.

[0053] The second threaded sleeve mounting base 19 is used to install and support the second threaded sleeve. Two second threaded sleeve mounting bases 19 are coaxially welded to the bottom surface of the lifting rod 1. The second threaded sleeve mounting base 19 is drilled with second threaded sleeve mounting holes, and the second threaded sleeve is snapped and fixed in the corresponding second threaded sleeve mounting holes. The two second threaded sleeves form a double threaded sleeve structure, which distributes the load, effectively improves the overall rigidity and bending strength, can transport counterweights with large mass, and extends the service life.

[0054] As one possible implementation method, such as Figure 1 , Figure 7 As shown, the top of the boom 1 is provided with a longitudinal tie rod 24 and a diagonal tie rod 22. The lifting ring 23 is provided at the top of the longitudinal tie rod 24. The central support 17 is hinged to the bottom of the boom 1. The longitudinal tie rod 24 is arranged opposite to the central support 17. The two ends of the diagonal tie rod 22 are respectively connected to the top surface of the boom 1 and the upper end of the longitudinal tie rod 24.

[0055] The longitudinal tie rod 24 is positioned on the top surface of the boom 1, facing away from the central support 17. The diagonal tie rod 22, longitudinal tie rod 24, and boom 1 form a triangular stable structure, making the lifting assembly more stable. The lifting ring 23 is welded to the upper end of the longitudinal tie rod 24, and the lower end of the diagonal tie rod 22 is positioned on the top surface of the boom 1 near the U-shaped support leg 5. The lower ends of the diagonal tie rod 22 and the longitudinal tie rod 24 can be welded to the top surface of the boom 1, or diagonal tie rod mounting seats and longitudinal tie rod mounting seats can be welded to the top surface of the boom 1. Diagonal tie rod mounting holes are provided at the lower ends of the diagonal tie rod mounting seats and the longitudinal tie rod 24. The diagonal tie rod 22 and the diagonal tie rod mounting seat are fixedly connected by bolts passing through the corresponding diagonal tie rod mounting holes and nuts. The longitudinal tie rod 24 and the longitudinal tie rod mounting seat are fixedly connected by bolts passing through the corresponding longitudinal tie rod mounting holes and nuts. The diagonal tie rod 22, the longitudinal tie rod 24, and the boom 1 are detachably connected.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic balancing lifting fixture, characterized in that, The system includes a boom (1), which is equipped with a lifting ring (23). One end of the boom (1) is equipped with a telescopic outrigger and a first drive mechanism for driving the telescopic outrigger to extend and retract. The boom (1) is hinged to a central support (17), which is vertically opposite to the lifting ring (23). The boom (1) is equipped with a counterweight mechanism, a balancing mechanism, and an integrated circuit. The counterweight mechanism includes a counterweight (20) and a second drive mechanism for driving the counterweight (20) to reciprocate along the length direction of the boom (1). The balancing mechanism includes a displacement sensor and a sliding mechanism. The sliding mechanism includes a slider (28) and an automatic locking mechanism. The slider (28) and the displacement sensor are arranged facing each other along the length direction of the boom (1). A diagonal brace (27) is hinged between the slider (28) and the central support (17). The power source components of the first drive mechanism, the second drive mechanism, and the automatic locking mechanism are electrically connected to the integrated circuit. The other end of the boom (1) is provided with a mounting plate (25). The displacement sensor is a magnetostrictive displacement sensor (34). The automatic locking mechanism includes a toothed clip (33) and an electromagnet (30). The magnetostrictive displacement sensor (34) and the electromagnet (30) are fixedly mounted on the boom (1). A connecting hole is provided on the back side of the toothed clip (33). The electromagnet (30) is provided with a connecting rod (32). The free end of the connecting rod (32) is slidably connected to the connecting rod. Inside the connection hole, the connecting rod (32) is fitted with a spring (31), the spring (31) is located between the toothed clip (33) and the electromagnet (30), the slider (28) is provided with a serrated structure that cooperates with the toothed clip (33), the serrated structure of the slider (28) is arranged facing the toothed side of the toothed clip (33), the slider (28) is provided with a through hole, and the measuring rod (29) of the magnetostrictive displacement sensor (34) slides through the through hole.

2. The automatic balancing lifting fixture according to claim 1, characterized in that, The telescopic outrigger is a U-shaped outrigger (5). The first leg arm (51) and the second leg arm (52) of the U-shaped outrigger (5) have vertical slots (53). The first drive mechanism includes a first motor (14). The output shaft of the first motor (14) is fixedly provided with a first crank arm. The tail end of the first motor (14) is fixedly provided with a second crank arm (15). A first connecting rod is provided between the first crank arm and the first leg arm (51) of the U-shaped outrigger (5). The two ends of the first connecting rod are respectively hinged to the first crank arm and the first leg arm (51) of the U-shaped outrigger (5). The second crank arm (15) is connected to the U-shaped outrigger. A second connecting rod (16) is provided between the second leg arm (52) of the leg (5). The two ends of the second connecting rod (16) are respectively hinged to the second crank arm (15) and the second leg arm (52) of the U-shaped support leg (5). A first screw (3) is provided below the rod (1). The first screw (3) is fitted with a first screw sleeve (36) that cooperates with it. The side wall of the first screw sleeve (36) is provided with a first guide rod and a second guide rod (4). The first guide rod and the second guide rod (4) are respectively slidably disposed in the slots (53) of the first leg arm (51) and the second leg arm (52) of the U-shaped support leg (5).

3. The automatic balancing lifting fixture according to claim 2, characterized in that, The second drive mechanism includes a third motor (13), the output shaft of which is provided with a third gear (12), the first screw (3) is a hollow tubular structure, a transmission spindle (41) is rotatably sleeved inside the first screw (3), a fourth gear (7) is fixedly provided at one end of the transmission spindle (41), the third gear (12) and the fourth gear (7) mesh, a second screw sleeve and a transmission spindle mounting seat (18) are provided below the boom (1), the transmission spindle mounting seat (18) is provided with a transmission spindle mounting hole, the other end of the transmission spindle (41) is fixedly inserted through the hollow second screw (2), the other end of the transmission spindle (41) is fixedly passed through the second screw (2) and rotatably connected in the transmission spindle mounting hole, the second screw (2) spirally passes through the second screw sleeve, and the counterweight (20) is provided on the second screw sleeve.

4. The automatic balancing lifting fixture according to claim 3, characterized in that, Two second threaded sleeve mounting seats (19) are provided below the boom (1). The second threaded sleeve mounting seats (19) have second threaded sleeve mounting holes. The second threaded sleeve is set in the corresponding second threaded sleeve mounting seat (19). The second screw (2) spirally passes through the two second threaded sleeves in sequence.

5. The automatic balancing lifting fixture according to claim 3, characterized in that, The boom (1) is provided with a leg folding mechanism, which includes a second motor (8). The output shaft of the second motor (8) is fixedly provided with a first gear (10). The bottom of the boom (1) is provided with a first screw mounting seat (40) for mounting the first screw (3). The first screw mounting seat (40) has a first screw mounting hole. One end of the first screw (3) is provided with a second gear (6). The first gear (10) meshes with the second gear (6). The other end of the first screw (3) spirally passes through the first screw sleeve (36) and is rotatably connected in the first screw mounting hole.

6. The automatic balancing lifting fixture according to claim 5, characterized in that, A first screw mounting bearing is provided in the first screw mounting hole. The other end of the first screw (3) is spirally passed through the first screw sleeve (36) and fixedly connected in the first screw mounting bearing. A transmission spindle mounting bearing is provided in the transmission spindle mounting hole. The other end of the transmission spindle (41) is fixedly passed through the second screw (2) and fixedly connected in the transmission spindle mounting bearing.

7. The automatic balancing lifting fixture according to claim 5, characterized in that, A partition (9) is provided between the first gear (10) and the third gear (12). The second motor (8) is located below the third motor (13). A fifth gear (11) meshes between the third gear (12) and the fourth gear (7). The partition (9) has an output shaft hole of the first motor (14), a fifth gear shaft hole, and a transmission spindle shaft hole. The output shaft of the first motor (14), the gear shaft of the fifth gear (11), and the transmission spindle (41) are respectively rotatably disposed in the output shaft hole of the first motor (14), the fifth gear shaft hole, and the transmission spindle shaft hole corresponding to the partition (9).

8. The automatic balancing lifting fixture according to claim 1, characterized in that, The bottom surface of the boom (1) is provided with a mounting plate (37), and the mounting plate (37) is provided with two opposing L-shaped guide plates (38). The two L-shaped guide plates (38) and the mounting plate (37) respectively form a U-shaped first guide rail and a second guide rail. The slider (28) is provided with a guide strip on the side facing away from the sawtooth structure. The guide strip of the slider (28) is slidably connected in the first guide rail. The toothed clip (33) is provided in the second guide rail. The distance between the back side of the toothed clip (33) and the bottom surface of the second guide rail is greater than the tooth height of the toothed clip (33).

9. The automatic balancing lifting fixture according to claim 1, characterized in that, The top of the boom (1) is provided with a longitudinal tie rod (24) and a diagonal tie rod (22). The lifting ring (23) is provided at the top of the longitudinal tie rod (24). The central support (17) is hinged to the bottom of the boom (1). The longitudinal tie rod (24) is arranged opposite to the central support (17). The two ends of the diagonal tie rod (22) are respectively connected to the top surface of the boom (1) and the upper end of the longitudinal tie rod (24).

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