Rapidly-detachable arc-shaped lifting appliance capable of automatically adjusting gravity center

Abstract

The utility model belongs to the technical field of hoisting processes, and particularly relates to a quickly-detachable arc-shaped lifting appliance capable of automatically adjusting the gravity center, which comprises a hoisting unit, a rolling aligning unit, a transverse aligning unit and a lifting hook unit, the lifting unit comprises an arc-shaped lifting frame, stroke limiting safety fixing bolts fixed to the two sides of the arc-shaped lifting frame and a fixing limiting hole formed in the middle of the arc-shaped lifting frame, and arc-shaped grooves are formed in the two sides of the arc-shaped lifting frame; the rolling aligning unit comprises a sliding frame, bearing sets fixed to the two sides of the interior of the sliding frame and a stop bolt fixed to one side of the sliding frame. The transverse aligning unit comprises a carriage, end covers fixed to the two ends of the carriage and a rotating shaft arranged in the carriage. After being adjusted by each aligning structure, the center of gravity of the lifting appliance and the center of gravity of the clamp are consistent, the whole lifting appliance is moved through the control system, the lifted clamp is moved to the assembly position, and the center shaft is fixed through the fixing pin, so that rapid assembly of the clamp is realized, and the assembly accuracy is improved.

Description

Technical Field

[0001] This utility model belongs to the field of hoisting technology, and in particular relates to a quick-disassembly arc-shaped hoisting tool that can adjust its center of gravity. Background Technology

[0002] Lifting gear refers to the device used in lifting machinery to lift heavy objects. The most commonly used lifting gear for lifting packaged items is the hook and sling; others include lifting rings, lifting suction cups, clamps, and forks, which are widely used in the lifting and hoisting industry. Commonly used lifting gear includes specialized rigging such as hooks, wire ropes, and chains. To meet the daily maintenance and lifting needs of large machinery, lifting gear serves as auxiliary mechanical equipment for loading, unloading, and transferring goods. With the continuous development of my country's industrial level, the requirements for lifting gear are becoming increasingly stringent. When lifting gear and robotic arms work together, the object to be lifted needs to undergo a change in posture to ensure accurate docking. However, the position and posture of the object after lifting are affected by external forces, making precise positioning and posture changes difficult. Furthermore, it is difficult to ensure that the center of gravity of the lifting gear is consistent with the center of gravity of the object being lifted during the lifting process, which can easily cause the object to tilt during lifting. This instability in the center of gravity causes the object to swing, reducing docking accuracy and potentially causing injury to other equipment and operators.

[0003] Therefore, a self-adjusting, quickly detachable arc-shaped lifting device is proposed to solve the above problems. Utility Model Content

[0004] To address the above issues, this invention provides a self-adjusting, quickly detachable arc-shaped lifting device. The lifting unit is fixedly connected to the fixture to be lifted via travel-limiting safety bolts on both sides of the arc-shaped hanger. After lifting, the bearing assembly in the rolling self-aligning unit rolls within the arc-shaped groove, adjusting the positions of the Y and Z axes. Simultaneously, the T-shaped seat rotates on the rotating shaft, adjusting the position of the X axis. Once the centers of gravity of the lifting device and the fixture are aligned, they maintain balance. The rolling self-aligning unit is secured with stop bolts, and the connecting shaft is secured with anti-loosening screws. At this point, the entire lifting device is moved via the control system to the assembly position of the fixture to be lifted. The central shaft is then secured with a fixing pin, improving assembly accuracy.

[0005] The technical solution provided by this utility model is as follows: a self-adjusting, quickly detachable arc-shaped lifting device, which includes a lifting unit, a rolling self-aligning unit, a lateral self-aligning unit, and a hook unit. The lifting unit includes an arc-shaped frame, travel limit safety fixing bolts fixed on both sides of the arc-shaped frame, and a fixing limit hole opened in the middle of the arc-shaped frame. Arc-shaped grooves are opened on both sides of the arc-shaped frame. The lifting unit is used to lift the clamp to be installed. The travel limit safety fixing bolts on both sides of the arc-shaped frame pass through the fixing limit hole and are fixedly connected to the clamp to be installed. The lifting machinery lifts the clamp to be installed through the hook unit.

[0006] The rolling self-aligning unit includes a carriage, bearing assemblies fixed on both sides inside the carriage, and a stop bolt fixed on one side of the carriage. When the fixture position is adjusted, the stop bolt is used to fix the rolling self-aligning unit on the arc-shaped hanger to prevent the rolling self-aligning unit from moving. The bearing assemblies are respectively rolledly connected to the arc-shaped grooves opened on both sides of the arc-shaped hanger. The stop bolt is fixed in the fixed limiting hole in the middle of the arc-shaped hanger. A T-shaped seat is fixed on the carriage. The T-shaped seat is rotatably connected to the transverse self-aligning unit. The rolling self-aligning unit slides in the arc-shaped groove of the arc-shaped hanger through the bearing assemblies. This process can adjust the position of the Y-axis and Z-axis of the fixture.

[0007] The lateral self-aligning unit includes a carriage, end caps fixed at both ends of the carriage, a rotating shaft installed inside the carriage, and anti-loosening screws fixed at one end of the rotating shaft. The two ends of the rotating shaft are rotatably connected to the two ends of the carriage through rolling bearings fixed inside the end caps. A circumferential groove is provided on the side of the rotating shaft near the anti-loosening screws, and the anti-loosening screws are slidably connected to the circumferential groove. Since the bearing assembly slides in the arc-shaped groove of the arc-shaped hanger, and the two ends of the rotating shaft are rotatably connected to the rolling bearings fixed inside the end caps, the T-shaped seat moves on the rotating shaft by itself. This adjusts the position of the X-axis. After the center of gravity of the hanger and the clamp are aligned, the two are balanced, and the relevant structure can be locked to maintain this balanced state.

[0008] The hook unit includes, from the inside out, a central shaft, a transmission bearing, and a connecting seat, and also includes a lifting ring fixed to the upper end of the central shaft. The connecting seat is fixedly connected to the top of the carriage in the transverse self-aligning unit. The top of the carriage has a groove, and the bottom of the central shaft is engaged with the groove and rotatably connected to the top of the carriage through the transmission bearing.

[0009] Further improvements to the above solution: Limiting shafts are provided on both sides of the arc-shaped hanger, located between the travel limit safety fixing bolts on both sides. These limiting shafts restrict the sliding trajectory of the rolling self-aligning unit, preventing excessive movement to both ends of the arc-shaped hanger. The travel limit safety fixing bolts are push-button locking bolts, with a locking ball head at the lower end and a push-button button for controlling the locking ball head on the upper end. A rotating nut is fixed to the bottom of the arc-shaped hanger via a chain. This design prevents the rotating nut from being... The cable is designed to be securely attached to the bottom of the lifting frame as it would be lost if unscrewed. The lower end of the arc-shaped lifting frame is integrally equipped with an arc-shaped locking strip, which engages with the arc-shaped groove on the outside of the clamp to be lifted. This design further ensures the tightness of the connection between the lifting device and the clamp, improving the safety and precision of loading and unloading. The press-type locking bolt passes through the arc-shaped lifting frame and is fixedly connected to the clamp to be lifted. Before installing the clamp, the locking ball head is retracted inward by pressing the button. After the clamp and lifting device are installed, the press-type locking bolt passes through the arc-shaped lifting frame and is fixedly connected to the clamp to be lifted. Then, the locking ball head is released by pressing the button to achieve the locking purpose.

[0010] Further improvement to the above scheme: The bearing assembly is arranged on both sides of the arc-shaped hanger, and each side bearing assembly includes several bearings arranged in a matrix. The bearings are fixed to the inner side of the slide by a fixed shaft, and the slide rolls in the arc-shaped groove by the bearings.

[0011] Further improvements to the above solution: The stop bolt includes a hollow crossbar and an L-shaped bolt inside the hollow crossbar. The L-shaped bolt is rotatably connected to the hollow crossbar. The hollow crossbar is fixedly connected to the side wall of the carriage by bolts. The outer end of the hollow crossbar is provided with an arc-shaped rotating end. The L-shaped bolt rotates along the arc-shaped rotating end, and locking grooves are provided on the upper and lower sides of the arc-shaped rotating end. The L-shaped bolt engages with the locking grooves. When the L-shaped bolt engages with the upper locking groove, it is used to lock the rolling self-aligning unit. When self-aligning operation is required, the L-shaped bolt is rotated to move along the arc-shaped rotating end until it is in a natural drooping state, pushing the L-shaped bolt to engage with the upper locking groove to prevent it from swinging back and forth. End caps are fixed at both ends of the carriage near the limiting shaft, and scale arrows are provided on the end caps.

[0012] Further improvement to the above solution: The anti-loosening screw includes a nut and an integrally formed irregular column under the nut. The irregular column has narrow and wide cuts on both sides of the rotating shaft. The lower end of the irregular column is an arc-shaped cut. The irregular column is engaged with the circumferential groove. The anti-loosening screw can prevent the rotating shaft from shifting or loosening.

[0013] Further improvements to the above scheme: A level is installed at the upper end of the carriage, which is used to correct the state of the clamps and lifting devices after center adjustment; the carriage has numerical scales engraved on both sides of the arc-shaped lifting frame, and the numerical scales are located at the lower end of the side of the carriage. The numerical scales are used in conjunction with the scale indicator arrows. After the center of gravity of the clamps and lifting devices is adjusted, the position of the scale indicator arrow of the rolling centering unit 2 and the numerical scale marked by the horizontal centering unit is recorded by recording the numerical scale indicated by the scale indicator arrow. This is used as a reference for subsequent lifting posture, saving lifting posture adjustment time and increasing work efficiency. A handle is fixed on the top of the numerical scale. When the clamps are installed, the handle needs to be held manually to avoid the lifting devices from swinging and improve loading and unloading efficiency.

[0014] Further improvement to the above solution: A retractable dust cover is provided at the bottom of the carriage. This dust cover is used to protect the internal structure of the transverse self-aligning unit and prevent external dust and debris from entering its interior, which could damage the rotating shaft.

[0015] Further improvements to the above solution: The lifting ring includes a circular ring, a base integrated with the circular ring, and a connecting shaft disposed below the base. A slot is provided inside the central shaft, and the connecting shaft is inserted into the slot and fixedly connected to the slot. The hook unit also includes a dust cover, which prevents external debris from entering the connecting shaft. The dust cover is fixedly connected to the upper end of the central shaft. A toothed anti-loosening screw is fixed between the base and the dust cover. A sealing ring is fixed between the dust cover and the upper end face of the connecting shaft. A sealing ring is also provided between the central shaft and the dust cover in the circumferential direction. A circumferential protrusion is provided inside the dust cover, and an annular groove is provided at a matching position on the central shaft. The circumferential protrusion engages with the annular groove.

[0016] A further improvement to the above solution: a fixing pin is provided on the side of the central shaft. After the central shaft is adjusted to the correct position, the fixing pin is inserted to fix the central shaft.

[0017] The features and beneficial effects of this utility model are:

[0018] 1. This utility model has an ingenious design and reasonable structure. By designing an arc-shaped hanger in the hoisting unit and a bearing assembly in the rolling self-aligning unit, the Y-axis and Z-axis positions can be adjusted by the self-rolling of the bearing assembly within the arc-shaped hanger. At the same time, the self-rolling of the bearing assembly within the arc-shaped hanger naturally causes the T-shaped seat to rotate on the rotating shaft, achieving the purpose of self-adjusting the X-axis position. The entire self-aligning process is completed naturally through the above-mentioned units, so the adjustment process is faster and more accurate. After the operator installs the clamp on the hoist, the self-aligning operation can be completed automatically during the hoisting process, which greatly improves safety and reduces labor.

[0019] 2. The design incorporates a stop bolt structure, allowing for easy fixing or loosening of the rolling self-aligning unit through a simple pushing operation, further improving loading and unloading efficiency.

[0020] 3. An anti-loosening screw structure is set up. Its irregular cylindrical design prevents displacement or loosening of the rotating shaft, improving the rationality and stability of the overall structure. Attached Figure Description

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

[0022] Figure 2 This is a top view schematic diagram of the overall structure of this utility model.

[0023] Figure 3 This is a structural schematic diagram of the hoisting unit of this utility model.

[0024] Figure 4 This is a schematic diagram showing the internal structure connection between the hoisting unit and the rolling self-aligning unit of this utility model.

[0025] Figure 5 Schematic diagram of the stop bolt

[0026] Figure 6 This is a schematic diagram of the connection between the rolling self-aligning unit and the lateral self-aligning unit of this utility model.

[0027] Figure 7 This is a schematic diagram of the anti-loosening screw of this utility model.

[0028] Figure 8 This is a cross-sectional view of the present invention.

[0029] Figure 9 for Figure 8 Enlarged view of part A in the image

[0030] Figure 10 The figure shows the location of the safety mark of this utility model.

[0031] In the diagram: 1. Lifting unit; 101. Arc-shaped hanger; 1011. Bottom end of arc-shaped hanger; 1012. Arc-shaped retaining strip; 102. Travel limit safety fixing bolt; 1021. Locking ball head; 1022. Press button; 1023. Rotating nut; 103. Fixed limit hole; 104. Arc-shaped groove; 105. Limiting shaft; 2. Rolling self-aligning unit; 201. Slide; 202. Bearing assembly; 2021. Bearing; 203. Stop bolt; 2031. Hollow crossbar; 2032. L-shaped bolt body; 2033. Bolt; 2034. Arc-shaped rotating end; 2035. Locking groove; 204. T-shaped seat; 3. Lateral self-aligning unit; 301. Carriage; 302. End cover; 303 Rotating shaft; 304, anti-loosening screw; 3041, nut; 3042, irregularly shaped cylinder; 3043, narrow cut; 3044, wide cut; 3045, arc-shaped cut; 305, circumferential groove; 306, rolling bearing; 307, level; 308, digital scale; 309, handle; 310, retractable dust cover; 4. Hook unit; 401, central shaft; 4011, slot; 402, transmission bearing; 403, connecting seat; 404, lifting ring; 4041, circular ring; 4042, base; 4043, connecting shaft; 405, dust cover; 4051, circumferential protrusion; 5. toothed anti-loosening screw; 6. sealing ring; 7. circumferential sealing ring; 8. fixing pin; 9. safety mark. Detailed Implementation

[0032] To fully describe the technical content, structural features, objectives, and effects of this utility model, the following detailed description will be provided in conjunction with the accompanying drawings.

[0033] like Figures 1 to 9 As shown, a self-adjusting, quickly detachable arc-shaped lifting device includes a lifting unit 1, a rolling self-aligning unit 2, a lateral self-aligning unit 3, and a hook unit 4. The lifting unit 1 includes an arc-shaped frame 101, travel limit safety fixing bolts 102 fixed on both sides of the arc-shaped frame 101, and a fixing limit hole 103 opened in the middle of the arc-shaped frame. Arc-shaped grooves 104 are opened on both sides of the arc-shaped frame 101.

[0034] The rolling self-aligning unit 2 includes a slide 201, bearing assemblies 202 fixed on both sides inside the slide, and a stop bolt 203 fixed on one side of the slide. The bearing assemblies 202 are rolledly connected to the arc-shaped grooves on both sides of the arc-shaped hanger. The stop bolt 203 is fixed in the fixed limiting hole in the middle of the arc-shaped hanger 102. A T-shaped seat 204 is fixed on the slide 201. The T-shaped seat 204 is rotatably connected to the transverse self-aligning unit 3.

[0035] The transverse self-aligning unit 3 includes a carriage 301, end caps 302 fixed at both ends of the carriage, a rotating shaft 303 disposed inside the carriage, and an anti-loosening screw 304 fixed at one end of the rotating shaft 303. The two ends of the rotating shaft 303 are rotatably connected to the two ends of the carriage 301 through rolling bearings 306 fixed inside the end caps 302. A circumferential groove 305 is provided on the side of the rotating shaft 303 near the anti-loosening screw 304, and the anti-loosening screw 304 is slidably connected to the circumferential groove 305.

[0036] The hook unit 4 includes, from the inside out, a central shaft 401, a transmission bearing 402, and a connecting seat 403, and also includes a lifting ring 404 fixed to the upper end of the central shaft 401. The connecting seat 403 is fixedly connected to the top of the carriage 301 in the transverse self-aligning unit 3. The top of the carriage 301 has a groove 306, and the bottom of the central shaft 401 is engaged with the groove 306 and rotatably connected to the top of the carriage 301 through the transmission bearing 402.

[0037] The arc-shaped hanger 101 is provided with limit shafts 105 on both sides. The limit shafts 105 are located between the travel limit safety fixing bolts 102 on both sides. The travel limit safety fixing bolts 102 are push-type locking bolts. The lower end of the push-type locking bolt is provided with a locking ball head 1021. The upper part of the push-type locking bolt is provided with a push button 1022 for controlling the locking ball head, and a rotating nut 1023 fixed on the push-type locking bolt. The rotating nut 1023 is fixedly connected to the bottom end 1011 of the arc-shaped hanger through a chain. The lower end face of the arc-shaped hanger 101 is integrally provided with an arc-shaped retaining strip 1012. The arc-shaped retaining strip 1012 engages with the arc-shaped groove on the outside of the clamp to be lifted. The push-type locking bolt passes through the arc-shaped hanger 101 and is fixedly connected to the clamp to be lifted.

[0038] The bearing assembly 202 is arranged on both sides of the arc-shaped hanger 101. Each side bearing assembly 202 includes a number of bearings 2021 arranged in a matrix. The bearings 2021 are fixed to the inner side of the slide 201 by a fixed shaft. The slide 201 rolls in the arc-shaped groove 104 through the bearings 2021.

[0039] The stop bolt 203 includes a hollow crossbar 2031 and an L-shaped bolt 2032 located inside the hollow crossbar 2031. The L-shaped bolt 2032 is rotatably connected to the hollow crossbar 2031. The hollow crossbar 2031 is fixedly connected to the side wall of the slide 201 by bolts 2033. The outer end of the hollow crossbar 2031 is provided with an arc-shaped rotating end 2034. The L-shaped bolt 2032 rotates along the arc-shaped rotating end 2034, and locking grooves 2035 are provided on the upper and lower sides of the arc-shaped rotating end 2034. The L-shaped bolt 2034 is engaged with the locking grooves 2035. The two ends of the slide 201 near the limiting shaft 105 are fixed with end caps 205. The end caps 205 are provided with scale arrows 206.

[0040] The anti-loosening screw 304 includes a nut 3041 and an integrally formed irregular column 3042 disposed below the nut 3041. The irregular column has a narrow cut 3043 and a wide cut 3044 on both sides along the rotation axis. The lower end of the irregular column 3042 is an arc-shaped cut 3045. The irregular column 3042 is engaged with the circumferential groove 305.

[0041] A level 307 is installed on the upper end of the carriage 301; the carriage 301 is engraved with numerical scales 308 along both sides of the arc-shaped hanger 101, the numerical scales 308 are located at the lower end of the side of the carriage 301, and a handle 309 is fixed on the top of the numerical scales 308.

[0042] The bottom of the carriage 301 is equipped with a retractable dust cover 310.

[0043] The lifting ring 404 includes a circular ring 4041, a base 4042 integrally formed with the circular ring 4041, and a connecting shaft 4043 disposed below the base. The central shaft 401 has a slot 4011 inside, and the connecting shaft 4043 is inserted into the slot 4011 and fixedly connected to the slot 4011. The hook unit 4 also includes a dust cover 405, which is fixedly connected to the upper end of the central shaft 401. A toothed anti-loosening screw 5 is fixed between the base 4042 and the dust cover 405. An end sealing ring 6 is fixed between the dust cover 405 and the upper end face of the connecting shaft 4043. A circumferential sealing ring 7 is also provided between the central shaft 401 and the dust cover 405. A circumferential protrusion 4051 is provided inside the dust cover 405. An annular groove is provided at a matching position on the central shaft 401, and the circumferential protrusion 4051 engages with the annular groove.

[0044] The side of the central shaft 401 is provided with a fixing pin 8 for fixing the central shaft.

[0045] The lifting rig is also marked with two safety symbols 9 to fully consider the safety and reliability of the rig and to ensure the smoothness of the lifting process to the greatest extent.

[0046] The specific operating steps of this utility model are as follows: Before installing the clamp, the rolling self-aligning unit 2 of the carriage is fixed by the stop bolt 203. The lifting machinery moves the lifting device to a suitable position. The lower end face of the arc-shaped hanger 101 is integrally provided with an arc-shaped locking strip 1012. The arc-shaped locking strip 1012 engages with the arc-shaped groove on the outside of the clamp to be lifted. Then, the two-end travel limit safety fixing bolts 102 are inserted into the clamp. During this process, pay attention to the alignment between the travel limit safety fixing bolt hole 102 on the arc-shaped hanger and the hole in the clamping device groove. By pressing the button 1022, the locking ball head 1021 is released to lock the clamp, thus completing the connection and fastening of the lifting device and the clamp to be lifted. At this time, the stop bolt 102 is released, and the lifting machinery moves the connected and fastened clamp and lifting device. During this process, the lifting unit 1... The arc-shaped hanger 101 and the bearing assembly 202 in the rolling self-aligning unit 2, under the weight of the lifting fixture, achieve self-adjustment of the Y-axis and Z-axis positions by the self-rolling of the bearing assembly 202 within the arc-shaped hanger 101. At the same time, the self-rolling of the bearing assembly 202 within the arc-shaped hanger 101 naturally causes the T-shaped seat 204 to rotate on the rotating shaft 303, achieving self-adjustment of the X-axis position. After adjustment, the rolling self-aligning unit 2 is fixed by the stop bolt 102. After the center of gravity of the lifting fixture and the clamp is adjusted, the lifting machinery moves the two connected and fixed to the equipment to be assembled. After the clamp is installed, the travel limit safety fixing bolt 102 and the stop bolt 203 are loosened, and the lifting machinery lifts the lifting fixture and separates it from the clamp, thus completing a quick and simple disassembly operation.

[0047] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A self-adjustable, quickly detachable arc-shaped lifting device, characterized in that: It includes a hoisting unit, a rolling self-aligning unit, a lateral self-aligning unit, and a hook unit. The hoisting unit includes an arc-shaped hanger, travel limit safety fixing bolts fixed on both sides of the arc-shaped hanger, and a fixing limit hole opened in the middle of the arc-shaped hanger. Arc-shaped grooves are opened on both sides of the arc-shaped hanger. The rolling self-aligning unit includes a slide, bearing assemblies fixed on both sides inside the slide, and a stop bolt fixed on one side of the slide. The bearing assemblies are rolledly connected to the arc-shaped grooves on both sides of the arc-shaped hanger. The stop bolt is fixed in the fixed limiting hole in the middle of the arc-shaped hanger. A T-shaped seat is fixed on the slide, and the T-shaped seat is rotatably connected to the transverse self-aligning unit. The lateral self-aligning unit includes a carriage, end caps fixed at both ends of the carriage, a rotating shaft disposed inside the carriage, and an anti-loosening screw fixed at one end of the rotating shaft. The two ends of the rotating shaft are rotatably connected to the two ends of the carriage through rolling bearings fixed inside the end caps. A circumferential groove is provided on the side of the rotating shaft near the anti-loosening screw, and the anti-loosening screw is slidably connected to the circumferential groove. The hook unit includes, from the inside out, a central shaft, a transmission bearing, and a connecting seat, and also includes a lifting ring fixed to the upper end of the central shaft. The connecting seat is fixedly connected to the top of the carriage in the transverse self-aligning unit. The top of the carriage has a groove, and the bottom of the central shaft is engaged with the groove and rotatably connected to the top of the carriage through the transmission bearing.

2. The self-adjustable, quickly detachable arc-shaped lifting device according to claim 1, characterized in that: The arc-shaped hanger is provided with limit shafts on both sides, which are located between the travel limit safety fixing bolts on both sides. The travel limit safety fixing bolts are push-button locking bolts, and the lower end of the push-button locking bolt is provided with a locking ball head. The upper part of the push-button locking bolt is provided with a push button to control the locking ball head, and a rotating nut fixed on the push-button locking bolt. The rotating nut is fixedly connected to the bottom end of the arc-shaped hanger by a chain. The lower end face of the arc-shaped hanger is integrally provided with an arc-shaped retaining strip, which engages with the arc-shaped groove on the outside of the clamp to be lifted. The push-button locking bolt passes through the arc-shaped hanger and is fixedly connected to the clamp to be lifted.

3. The self-adjustable, quickly detachable arc-shaped lifting device according to claim 1, characterized in that: The bearing assembly is arranged on both sides of the arc-shaped hanger. Each side bearing assembly includes several bearings arranged in a matrix. The bearings are fixed to the inner side of the slide by a fixed shaft. The slide rolls in the arc-shaped groove by passing through the bearings.

4. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 1, characterized in that: The stop bolt includes a hollow crossbar and an L-shaped bolt inside the hollow crossbar. The L-shaped bolt is rotatably connected to the hollow crossbar. The hollow crossbar is fixedly connected to the side wall of the slide by bolts. The outer end of the hollow crossbar is provided with an arc-shaped rotating end. The L-shaped bolt rotates along the arc-shaped rotating end, and locking grooves are provided on the upper and lower sides of the arc-shaped rotating end. The L-shaped bolt engages with the locking grooves. End caps are fixed at both ends of the slide near the limiting shaft. The end caps are provided with scale arrows.

5. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 1, characterized in that: The anti-loosening screw includes a nut and an integrally formed irregular column under the nut. The irregular column has narrow and wide cuts on both sides along the rotation axis. The lower end of the irregular column has an arc-shaped cut. The irregular column is engaged with the circumferential groove.

6. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 1 or 5, characterized in that: A level is installed at the top of the carriage; the carriage has numerical scales engraved on both sides of the arc-shaped hanger, the numerical scales are located at the lower end of the side of the carriage, and a handle is fixed above the numerical scales.

7. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 6, characterized in that: The bottom of the carriage is equipped with a retractable dust cover.

8. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 1, characterized in that: The lifting ring includes a circular ring, a base integrally formed with the circular ring, and a connecting shaft disposed below the base. The central shaft has a slot inside, and the connecting shaft is inserted into the slot and fixedly connected to the slot. The hook unit also includes a dust cover, which is fixedly connected to the upper end of the central shaft. A toothed anti-loosening screw is fixed between the base and the dust cover. A sealing ring is fixed between the dust cover and the upper end face of the connecting shaft. A sealing ring is also provided between the central shaft and the dust cover in the circumferential direction. The dust cover has a circumferential protrusion inside, and an annular groove is provided at a matching position on the central shaft. The circumferential protrusion engages with the annular groove.

9. A self-adjustable, quickly detachable arc-shaped lifting device according to claim 1 or 8, characterized in that: A fixing pin is provided on the side of the central shaft.

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