Lifting device

Abstract

The invention provides a lifting device which comprises a lifting component, a supporting component, a fixing component and a height adjusting component, the lifting component comprises a lifting rod and a lifting element, the lifting element is connected with one end of the lifting rod, one end of the supporting component is rotationally connected with the lifting rod, and the lifting rod can rotate around the end of the supporting component; the lifting component is rotatably connected with one end of the supporting component to adjust the height of the lifting component relative to the ground so that the lifting component can lift a target object, the fixing component is rotatably connected with the other end of the supporting component so that the direction of the lifting device can be adjusted, and the fixing component is used for being buried underground so that the whole lifting device can be fixed; one end of the height adjusting part is connected with the supporting part, the other end of the height adjusting part is connected with the other end of the hoisting rod, the length of the height adjusting part can be adjusted, and force can be applied to the hoisting rod in the height adjusting process, so that the hoisting rod rotates around the supporting part, and the height of the hoisting element relative to the ground is adjusted; therefore, the target object can be hoisted by the hoisting element.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum engineering equipment, in particular to a lifting device. Background Art

[0002] Well repair is a must in the oil industry. Well repair work usually takes 2-30 days from relocation to completion, and the work site often involves lifting of equipment and materials. The lifting equipment in the prior art is a self-propelled crane, but the well repair site is not equipped with a dedicated crane. For example, when the well site is relocated, the duty room, tool room, equipment sled, liquid storage tank, cement mixing tank, etc. require a large crane. When the well repair process is carried out normally, there will be multiple small hoists of more than 100 kilograms from time to time, and small hoists of more than 100 kilograms cannot be transported manually, such as hoisting tons of cement bags on cement mixing tanks, replacing electric pumps on liquid storage tanks, and taking and placing oil pipe blowout preventers and hydraulic tongs in equipment sleds. If self-propelled cranes are still used in the above scenarios, prominent problems will arise: 1. The waiting time from need to realization is long and the span is large, which affects the construction speed; 2. There are many related transactions and high consumption costs; 3. There are many environmental requirements for site area, hardness, visibility, etc. Summary of the invention

[0003] The present invention provides a lifting device, which can solve part of the transportation work at the well repair site, improve the construction progress of the well repair work, has low consumption cost, occupies less production area, and is more tolerant to the construction environment.

[0004] In view of this, the present invention proposes a lifting device, including: a lifting component, including a lifting rod and a lifting element, the lifting element is connected to one end of the lifting rod; a supporting component, one end of which is rotatably connected to the lifting rod; a fixing component, which is rotatably connected to the other end of the supporting component; a height adjustment component, which can adjust its own length, one end of which is connected to the supporting component, and the other end of which is connected to the other end of the lifting rod.

[0005] In some optional embodiments, the fixing component includes a fixing rod, a first reinforcement element and a second reinforcement element, and two ends of the fixing rod that are oppositely arranged in the length direction are respectively connected to the first reinforcement element and the second reinforcement element, and the second reinforcement element is rotatably connected to the supporting component.

[0006] In some optional embodiments, the supporting component and the fixing component are connected via a first rotating component.

[0007] In some optional embodiments, the first rotating component includes a bidirectional sleeve element, a first pipe section, a through-the-heart ball disk and a first hinge hoop, one end of the first pipe section is inserted into the interior of the bidirectional sleeve element, and the other end of the first pipe section passes through the through-the-heart ball disk and is connected to the first hinge hoop; the first hinge hoop is connected to the supporting component; and the bidirectional sleeve element is connected to the fixed component.

[0008] In some optional embodiments, the bidirectional sleeve element includes a first sleeve element and a second sleeve element. In the axial direction of the bidirectional sleeve element, the first sleeve element and the second sleeve element are arranged back to back, the first pipe section is inserted into the interior of the first sleeve element, and the second sleeve element is connected to the fixing component.

[0009] In some optional embodiments, the supporting component includes a second pipe section and a second hinge hoop, and the second pipe section is respectively connected to the first hinge hoop and the second hinge hoop.

[0010] In some optional embodiments, the lifting rod is provided with a third hinge hoop, and the second hinge hoop and the third hinge hoop are connected via a second rotating component.

[0011] In some optional embodiments, a fourth hinge hoop is provided at the end of the lifting rod away from the lifting element, and the height adjustment component is rotatably connected to the first hinge hoop and the fourth hinge hoop respectively.

[0012] In some optional embodiments, the height adjustment component includes a controller and a hydraulic cylinder, the hydraulic cylinder and the controller are electrically connected, and the hydraulic cylinder rotatably connects the first hinge hoop and the fourth hinge hoop respectively.

[0013] In some optional embodiments, the hydraulic cylinder is connected to the first hinge hoop via a third rotating component, and the hydraulic cylinder is connected to the fourth hinge hoop via a fourth rotating component.

[0014] Compared with the prior art, the present invention has the following technical effects:

[0015] The present application provides a lifting device, which comprises: a lifting component, a supporting component, a fixing component and a height adjusting component. The lifting component comprises a lifting rod and a lifting element. The lifting element is connected to one end of the lifting rod. One end of the supporting component is rotatably connected to the lifting rod. The lifting rod can rotate around the end of the supporting component to adjust the height of the lifting element relative to the ground, so that the lifting element can lift the target object. The fixing component is rotatably connected to the other end of the supporting component to adjust the direction of the lifting device. The fixing component is used to be buried underground to fix the entire lifting device. One end of the height adjusting component is connected to the supporting component, and the other end of the height adjusting component is connected to the other end of the lifting rod. The height adjusting component can adjust its own length. During the process of adjusting the height, the height adjusting component can apply force to the lifting rod, so that the lifting rod rotates around the supporting component, thereby adjusting the height of the lifting element relative to the ground, so that the lifting element can lift the target object. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic diagram of the structure of a lifting device provided in one embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a bidirectional sleeve element provided in one embodiment of the present invention.

[0019] in, Figures 1-2 The corresponding relationship between the reference numerals and component names in the figure is:

[0020] 1-lifting component; 11-lifting rod; 12-lifting element; 13-third hinge hoop; 14-fourth hinge hoop; 2-support component; 21-second pipe section; 22-second hinge hoop; 3-fixing component; 31-fixing rod; 32-first reinforcement element; 33-second reinforcement element; 4-height adjustment component; 41-controller; 42-hydraulic cylinder; 5-first rotating component; 51-bidirectional sleeve element; 511-first sleeve element; 512-second sleeve element; 52-first pipe section; 53-through-the-ball plate; 54-first hinge hoop. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0023] Well repair is a must in the oil industry. Well repair work usually takes 2-30 days from relocation to completion, and the work site often involves lifting of equipment and materials. The lifting equipment in the prior art is a self-propelled crane, but the well repair site is not equipped with a dedicated crane. For example, when the well site is relocated, the duty room, tool room, equipment sled, liquid storage tank, cement mixing tank, etc. require a large crane. When the well repair process is carried out normally, there will be multiple small hoists of more than 100 kilograms from time to time, and small hoists of more than 100 kilograms cannot be transported manually, such as hoisting tons of cement bags on cement mixing tanks, replacing electric pumps on liquid storage tanks, and taking and placing oil pipe blowout preventers and hydraulic tongs in equipment sleds. If self-propelled cranes are still used in the above scenarios, prominent problems will arise: 1. The waiting time from need to realization is long and the span is large, which affects the construction speed; 2. There are many related transactions and high consumption costs; 3. There are many environmental requirements for site area, hardness, visibility, etc.

[0024] The present invention provides a lifting device, which can solve part of the transportation work at the well repair site, improve the construction progress of the well repair work, has low consumption cost, occupies less production area, and is more tolerant to the construction environment.

[0025] The present invention provides a lifting device, which includes: a lifting component 1, a supporting component 2, a fixing component 3 and a height adjusting component 4, the lifting component 1 includes a lifting rod 11 and a lifting element 12, the lifting element 12 is connected to one end of the lifting rod 11; one end of the supporting component 2 is rotatably connected to the lifting rod 11; the fixing component 3 is rotatably connected to the other end of the supporting component 2; the height adjusting component 4 can adjust its own length, one end of which is connected to the supporting component 2, and the other end of which is connected to the other end of the lifting rod 11.

[0026] Specifically, the lifting device includes: a lifting component 1, a supporting component 2, a fixing component 3 and a height adjusting component 4. The lifting component 1 includes a lifting rod 11 and a lifting element 12. The lifting element 12 is connected to one end of the lifting rod 11. One end of the supporting component 2 is rotatably connected to the lifting rod 11. The lifting rod 11 can rotate around the end of the supporting component 2, thereby adjusting the height of the lifting element 12 relative to the ground, so that the lifting element 12 can lift the target object. The fixing component 3 is rotatably connected to the other end of the supporting component 2, thereby adjusting the direction of the lifting device. The fixing component 3 is used to be buried underground to fix the entire lifting device. One end of the height adjusting component 4 is connected to the supporting component 2, and the other end of the height adjusting component 4 is connected to the other end of the lifting rod 11. The height adjusting component 4 can adjust its own length. During the process of adjusting the height, the height adjusting component 4 can apply force to the lifting rod 11, so that the lifting rod 11 rotates around the supporting component 2, thereby adjusting the height of the lifting element 12 relative to the ground, so that the lifting element 12 can lift the target object.

[0027] In some optional embodiments, the fixing component 3 includes a fixing rod 31, a first reinforcement element 32 and a second reinforcement element 33, and the two ends of the fixing rod 31 that are oppositely arranged in the length direction are respectively connected to the first reinforcement element 32 and the second reinforcement element 33, and the second reinforcement element 33 is rotatably connected to the supporting component 2.

[0028] Specifically, the fixing rod 31 is a ground anchor, which can be a conventional type used in daily construction at the well repair site for stabilizing the derrick, placing the spray line, and fracturing the wellhead. The fixing rod 31 is in the shape of a round tube, and a conical head is set at one end of the fixing rod 31. The conical head of the fixing rod 31 is connected to the first reinforcement element 32. Optionally, the first reinforcement element 32 is a large-diameter spiral sheet, and the fixing rod 31 is threadedly connected to the first reinforcement element 32, or the fixing rod 31 is welded to the first reinforcement element 32. The first reinforcement element 32 is used to improve the stability of the fixing rod 31 during drilling force and static. The second reinforcement element 33 can be connected to the support component 2, and the second reinforcement element 33 can also enter the connecting sleeve of the ground anchor vehicle. During the relocation period, the fixing rod 31 is directly screwed into the ground using the ground anchor vehicle. The second reinforcing element 33 is formed by welding two square plates with holes drilled in the middle. The hole drilled in the middle of the second reinforcing element 33 is used to accommodate one end of the lever. Pins can be inserted into the two holes to prevent the rod from falling out, so as to ensure that the rod 31 can be put into the ground or withdrawn after use by manual rotation without an anchor truck. The rod 31 can be a conventional type used in daily construction at the well repair site for stabilizing the derrick, placing the spray line, and fracturing the wellhead. It is always available at the site and does not need to be specially processed, so that the preparation time can be shortened.

[0029] In some optional embodiments, a fourth hinge hoop 14 is provided at the end of the lifting rod 11 away from the lifting element 12 , and the height adjustment component 4 is rotatably connected to the first hinge hoop 54 and the fourth hinge hoop 14 .

[0030] Specifically, the lifting component 1 includes a lifting rod 11 and a lifting element 12, one end of the lifting rod 11 is connected to the lifting element 12, and the other end of the lifting rod 11 is connected to the fourth hinge hoop 14. The lifting element 12 is a groove hook, and the groove hook can be formed by directly welding large-diameter rings at both ends of the oil pipe coupling used in daily construction at the well repair site. The groove hook is used to hook and fix the sling, and prevent the sling from falling out through the large-diameter ring. The groove hook can also be connected to a traction rope to facilitate the lateral movement of the hoisted object.

[0031] In some optional embodiments, the supporting component 2 and the fixing component 3 are connected via a first rotating component 5 .

[0032] Specifically, the support component 2 and the fixing component 3 can rotate around the first rotating component 5, so that the direction and angle of the lifting device can be adjusted. Optionally, the range of rotation of the support component 2 and the fixing component 3 is 0 to 360 degrees.

[0033] In some optional embodiments, the first rotating component 5 includes a bidirectional sleeve element 51, a first pipe section 52, a through-hole ball disc 53 and a first hinge hoop 54, one end of the first pipe section 52 is inserted into the interior of the bidirectional sleeve element 51, and the other end of the first pipe section 52 passes through the through-hole ball disc 53 and is connected to the first hinge hoop 54; the first hinge hoop 54 is connected to the supporting component 2; and the bidirectional sleeve element 51 is connected to the fixing component 3.

[0034] Specifically, the through-core ball bearing plate 53 is a double-layer ball bearing structure, and the upper and lower outer protective plates of the through-core ball bearing plate 53 contact the lower plane of the first hinge hoop 54 and the upper plane of the two-way sleeve element 51 respectively. The friction resistance of the through-core ball bearing plate 53 is quite small, which is conducive to reducing the force when rotating the hoisted object. The through-core ball bearing plate 53 can be a common type that is sleeved under the top coupling of the oil pipe to reduce wear and assist rotation during daily sand flushing and drilling and grinding construction at the well repair site, so it can be used immediately and has a fast speed.

[0035] Further, the first pipe section 52 can be an N-80 thickened oil pipe. Optionally, the first pipe section 52 is a thickened oil pipe with a diameter of 73 mm, an outer diameter of the thickened oil pipe of 73 mm, an inner diameter of the thickened oil pipe of 62 mm, and a minimum yield limit of the first pipe section 52 of 550.8 MPa. One end of the 2000 mm thickened oil pipe is loaded with 2000 kg, and 2000 kg will only cause a small bend but will never break. The tons of cement bags used from time to time during construction at the well repair site, the replacement of electric pumps on the liquid storage tank, and the removal of oil pipe blowout preventers and hydraulic tongs in the equipment sled do not exceed 2000 kg. The first pipe section 52 uses a common 0.5-meter short section.

[0036] In some optional embodiments, the bidirectional sleeve element 51 includes a first sleeve element 511 and a second sleeve element 512. In the axial direction of the bidirectional sleeve element 51, the first sleeve element 511 and the second sleeve element 512 are arranged back to back, the first pipe section 52 is inserted into the interior of the first sleeve element 511, and the second sleeve element 512 is connected to the fixing component 3.

[0037] In some optional embodiments, the supporting component 2 includes a second pipe section 21 and a second hinge hoop 22 , and the second pipe section 21 is connected to the first hinge hoop 54 and the second hinge hoop 22 , respectively.

[0038] Specifically, the first pipe section 52 can be an N-80 thickened oil pipe. Optionally, the first pipe section 52 is a thickened oil pipe with a diameter of 73 mm, an outer diameter of the thickened oil pipe of 73 mm, an inner diameter of the thickened oil pipe of 62 mm, and a minimum yield limit of the first pipe section 52 of 550.8 MPa. One end of the 2000 mm thickened oil pipe is loaded with 2000 kg, which will only cause a small bend but will never break. The tons of cement bags used from time to time during the construction of the well repair site, the replacement of electric pumps on the liquid storage tank, and the removal of oil pipe blowout preventers and hydraulic tongs in the equipment sled do not exceed 2000 kg. The second pipe section 21 uses a common one-meter short section.

[0039] Furthermore, the fixing component 3 and the supporting component 2 are connected so that the ground anchor, the two-way sleeve element 51, the first pipe section 52, the through-hole ball plate 53, the first hinge hoop 54, the second pipe section 21, the second hinge hoop 22 and the third hinge hoop 13 are installed in sequence from bottom to top so that the longitudinal axis line limit is close to each other to reduce the force when rotating the hoisted object.

[0040] In some optional embodiments, the lifting rod 11 is provided with a third hinge hoop 13, and the second hinge hoop 22 and the third hinge hoop 13 are connected via a second rotating component.

[0041] Specifically, the second rotating component is a pin. The third hinge hoop 13, the second hinge hoop 22 and the third hinge hoop 13 are all short sections of the oil pipe. The third hinge hoop 13 is welded with a hinge plate, and the second hinge hoop 22 is welded with two hinge plates. The hinge plate welded by the third hinge hoop 13 is arranged between the two hinge plates welded by the second hinge hoop 22. The three hinge plates are fixed by the second rotating component. The third hinge hoop 13 can rotate around the second hinge hoop 22, so that the lifting rod 11 can rotate around the supporting component 2.

[0042] In some optional embodiments, the height adjustment component 4 includes a controller 41 and a hydraulic cylinder 42 , the hydraulic cylinder 42 and the controller 41 are electrically connected, and the hydraulic cylinder 42 rotatably connects the first hinge hoop 54 and the fourth hinge hoop 14 .

[0043] In some optional embodiments, the hydraulic cylinder 42 is connected to the first hinge hoop 54 via a third rotating component, and the hydraulic cylinder 42 is connected to the fourth hinge hoop 14 via a fourth rotating component.

[0044] Specifically, the third rotating component may be a pin. The fourth rotating component may be a pin. The first hinge hoop 54 welds two hinge plates, and the fourth hinge hoop 14 welds two hinge plates. One end of the hydraulic cylinder 42 is connected to the two hinge plates welded to the first hinge hoop 54 via a pin, and the other end of the hydraulic cylinder 42 is connected to the two hinge plates welded to the fourth hinge hoop 14 via a pin. The hydraulic cylinder 42 can adjust its own length. During the process of adjusting the height, the hydraulic cylinder 42 can apply force to the lifting rod 11, so that the lifting rod 11 rotates around the supporting component 2, thereby adjusting the height of the lifting element 12 relative to the ground, so that the lifting element 1 can lift the target object.

[0045] Furthermore, the arrangement of the hydraulic cylinder 42 and the lifting element 12 as shown in the figure can produce a balance, which is conducive to the extreme approach of the longitudinal axis between the fixed rod 31 and the third hinge hoop 13, so as to reduce the force when rotating the hoisted object. The hydraulic cylinder 42 forms a load-bearing function when the piston rod is retracted, and the cylinder diameter and weight of the hydraulic cylinder 42 will increase accordingly, but within the range of a few centimeters and a few kilograms, the labor intensity increased by the hydraulic cylinder 42 is not obvious.

[0046] In some optional embodiments, the first hinge hoop 54, the second hinge hoop 22, the third hinge hoop 13, and the fourth hinge hoop 14 are formed by directly welding hinges to the tubing coupling. The first hinge hoop 54, the second hinge hoop 22, the third hinge hoop 13, and the fourth hinge hoop 14 are 73 mm thickened tubing nipples, and the outer diameter of the coupling corresponding to the thickened tubing nipples is 93 mm, the inner diameter is 80 mm, and the length is 135 mm. The wall thickness is greater than the tubing nipples. After welding the hinges, the tensile strength test can meet the safety requirements, the welding operation is relatively easy, the work difficulty and strength of the staff can be saved, and the storage space is relatively small.

[0047] The lifting device provided by the present invention can be implemented by the following embodiments:

[0048] Preparation: Use the common oil pipe couplings at the well repair site to weld and make the first hinge hoop 54, the second hinge hoop 22, the third hinge hoop 13, the fourth hinge hoop 14, and the lifting element 12. Process and make the two-way sleeve element 51. Purchase the hydraulic cylinder 42 and the controller 41. Check and select the fixed rod 31 available at the well repair site. Drive the fixed rod 31 and the first reinforcement element 32 into the ground near the required lifting part with an anchor truck or a manual lever, and expose the second reinforcement element 33 on the fixed rod 31; check and select the through-ball plate 53 available at the well repair site; check and select the first pipe section 52, the second pipe section 21, and the lifting rod 11 available at the well repair site; check and select the hydraulic system of the well repair machine available at the well repair site, and equip it with corresponding connecting pipelines.

[0049] Application: The controller 41 sends a command to the hydraulic cylinder 42, the piston rod of the hydraulic cylinder 42 extends, the lifting element 12 moves downward to approach the hoisting object, the lifting element 12 is connected to the hoisting object through the sling to make the piston rod of the hydraulic cylinder 42 contract, the lifting element 12 and the hoisting object move upward, the traction rope on one side of the lifting element 12 is manually tightened, the hoisting object is moved horizontally above the landing point, the piston rod of the hydraulic cylinder 42 extends, the lifting element 12 moves downward, the hoisting object is parked at the landing point, and the lifting element 12 releases the sling to complete the lifting. The maximum application range of the lifting element 12 is within 3 meters, and the general visibility does not affect the operation. The use requirements are significantly lower than those of a self-propelled crane. Two people operate once to lift in minutes.

[0050] The beneficial effects of the present invention are as follows: the lifting device is a temporary assembly on site, and the larger components are made of materials readily available on site. The device can be assembled and disassembled quickly, and the time span from the need to the realization of lifting is significantly shortened, which correspondingly increases the construction speed and reduces the consumption cost. The lifting device is novel and compact in design, occupies a small area, has fewer usage limitations, and is conducive to operation and application.

[0051] In the present invention, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting device, characterized in that: include: A lifting component (1) comprises a lifting rod (11) and a lifting element (12), wherein the lifting element (12) is connected to one end of the lifting rod (11); A supporting component (2), one end of which is rotatably connected to the lifting rod (11); A fixing component (3) rotatably connected to the other end of the supporting component (2); The height adjustment component (4) is capable of adjusting its own length, one end of which is connected to the support component (2) and the other end of which is connected to the other end of the lifting rod (11).

2. The lifting device according to claim 1, characterized in that: The fixing component (3) comprises a fixing rod (31), a first reinforcing element (32) and a second reinforcing element (33); two opposite ends of the fixing rod (31) in the length direction are respectively connected to the first reinforcing element (32) and the second reinforcing element (33); and the second reinforcing element (33) is rotatably connected to the supporting component (2).

3. The lifting device according to claim 1 or 2, characterized in that: The supporting component (2) and the fixing component (3) are connected via a first rotating component (5).

4. The lifting device according to claim 3, characterized in that: The first rotating component (5) comprises a bidirectional sleeve element (51), a first pipe section (52), a through-the-heart ball disc (53) and a first hinge hoop (54); one end of the first pipe section (52) is inserted into the interior of the bidirectional sleeve element (51), and the other end of the first pipe section (52) passes through the through-the-heart ball disc (53) and is connected to the first hinge hoop (54); The first hinge hoop (54) is connected to the supporting component (2); The bidirectional sleeve element (51) is connected to the fixing component (3).

5. The lifting device according to claim 4, characterized in that: The bidirectional sleeve element (51) comprises a first sleeve element (511) and a second sleeve element (512). In the axial direction of the bidirectional sleeve element (51), the first sleeve element (511) and the second sleeve element (512) are arranged back to back, the first pipe section (52) is inserted into the interior of the first sleeve element (511), and the second sleeve element (512) is connected to the fixing component (3).

6. The lifting device according to claim 1, characterized in that: The supporting component (2) comprises a second pipe section (21) and a second hinge hoop (22), wherein the second pipe section (21) is respectively connected to the first hinge hoop (54) and the second hinge hoop (22).

7. The lifting device according to claim 6, characterized in that: The lifting rod (11) is provided with a third hinge hoop (13), and the second hinge hoop (22) and the third hinge hoop (13) are connected via a second rotating component.

8. The lifting device according to claim 1, characterized in that: A fourth hinge hoop (14) is provided at the end of the lifting rod (11) away from the lifting element (12), and the height adjustment component (4) is rotatably connected to the first hinge hoop (54) and the fourth hinge hoop (14).

9. The lifting device according to claim 8, characterized in that: The height adjustment component (4) comprises a controller (41) and a hydraulic cylinder (42), wherein the hydraulic cylinder (42) and the controller (41) are electrically connected, and the hydraulic cylinder (42) is rotatably connected to the first hinge hoop (54) and the fourth hinge hoop (14) respectively.

10. The lifting device according to claim 9, characterized in that: The hydraulic cylinder (42) is connected to the first hinge hoop (54) via a third rotating component, and the hydraulic cylinder (42) is connected to the fourth hinge hoop (14) via a fourth rotating component.

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