Ground well joint lifting device

Abstract

The utility model relates to a ground well connector lifting device. Comprising a lifting cylinder, a lifting bracket and a lifting control assembly, the lifting support is provided with a mounting part used for being mounted on a ground well connector and a supporting part used for being supported on the ground, and the lifting air cylinder is mounted on the lifting support and can drive the lifting support to lift the ground well connector. The lifting control assembly comprises a two-position three-way valve, the inlet end of the two-position three-way valve is used for being communicated with the air outlet end of an air control box of the refueling vehicle, the first outlet end of the two-position three-way valve is used for being communicated with the end, provided with a deadman control valve, of the refueling vehicle, and the second outlet end of the two-position three-way valve is used for being communicated with a lifting air cylinder. According to the utility model, the automatic lifting operation of the ground well joint is realized, and the working intensity of operators is reduced; and on the other hand, the air source of the lifting air cylinder is automatically cut off to form interlocking when the deadman control valve is held by a hand for refueling, so that the ground well joint is effectively prevented from being lifted in the refueling process, the risk of misoperation in the refueling process is reduced, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of apron pipe network refueling ground well joint, more particularly to a ground well joint lifting device. BACKGROUND

[0002] At present, most of the large airports adopt apron pipe network refueling mode, one end of the pipeline truck refueling vehicle 4-inch ground well joint connects the apron pipe network ground well plug near the parking position, and the other end of the aircraft refueling joint connects the aircraft refueling interface to realize the aircraft refueling. The weight of the ground well joint and auxiliary facilities reaches about 35 kilograms, and at present, it is basically moved and connected by manpower. Although measures are taken at each site, the refueling personnel are required to adopt a more reasonable posture to avoid injury and be standardized, the problem is still not solved from the root, and the labor intensity of the staff is not reduced. Due to the heavy weight, the ground well valve and the ground well joint are knocked and scratched, which reduces the service life of the equipment, and the structure is relatively complex, and the working performance is unstable.

[0003] Traditionally, the lifting and butt joint of the 4-inch ground well joint depend on manpower, and the labor intensity is large, and the personnel body is damaged (the waist of the refueling personnel is damaged greatly). The traditional lifting and butt joint method cannot meet the demand of modern aviation oil for high efficiency, safety and convenience. Moreover, the existing butt joint method of the 4-inch ground well joint is easy to cause damage to the refueling equipment, and the existing ground well automatic lifting device has low stability and reliability in the use process, has the risk of human operation error, and is easy to cause accidents in the lifting process. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of poor stability and easy operation error of the existing lifting device in the prior art, and provides a ground well joint lifting device, which is stable and can effectively prevent the occurrence of misoperation in the refueling process.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] A ground well joint lifting device is provided, which comprises a lifting cylinder, a lifting support and a lifting control assembly. The lifting support is provided with a mounting portion for mounting on the ground well joint and a supporting portion for supporting on the ground. The lifting cylinder is installed on the lifting support and can drive the lifting support to lift the ground well joint. The lifting control assembly comprises a two-position three-way valve. The inlet end of the two-position three-way valve is connected with the outlet end of the gas control box of the refueling vehicle. The first outlet end of the two-position three-way valve is connected with one end of the De Dion valve of the refueling vehicle. The second outlet end of the two-position three-way valve is connected with the lifting cylinder.

[0007] The utility model provides a kind of ground well connector lifting device, install lifting device on ground well connector, realize automatic lifting ground well connector by controlling the lifting of lifting cylinder.The gas source of lifting cylinder comes from the gas control box of refueling vehicle, the inlet end of two-position three-way valve is communicated with the outlet end of refueling vehicle gas control box, the first outlet end of two-position three-way valve is communicated with one end of the dumb Dan control valve of refueling vehicle, the second outlet end of two-position three-way valve is communicated with lifting cylinder, such connection, when operator holds dumb Dan control valve and fills, the gas path of ground well connector lifting cylinder is cut off, interlock is formed, prevent the risk of misoperation in the process of filling.Dumb Dan control valve does not work, the gas source of gas control box is communicated with lifting cylinder, realizes ground well connector lifting, when filling, dumb Dan control valve works, by two-position three-way valve, the gas path of gas control box and lifting cylinder connection is cut off, gas control box is directly communicated with dumb Dan control valve, realizes interlock.The utility model provides ground well connector lifting device, by being added on existing refueling vehicle and being communicated with lifting cylinder, by the setting of two-position three-way valve, interlock is realized, can effectively avoid operator misoperation, avoid lifting ground well connector in the process of filling.

[0008] Further, the lifting control assembly further comprises a throttle valve for controlling the lifting speed, and the throttle valve is installed on the pipeline of the lifting cylinder air inlet end. The throttle valve controls the flow through the lifting cylinder by changing the throttle section to achieve the effect of controlling the lifting speed.

[0009] Further, the lifting control assembly further comprises a hand-operated two-position five-way valve for controlling the lifting or lowering of the lifting cylinder, the air inlet end of the two-position five-way valve is communicated with the second outlet of the two-position three-way valve, the positive action exhaust port and the reverse action exhaust port of the two-position five-way valve are respectively communicated with the air inlet port and the air outlet port of the lifting cylinder. The two-position five-way valve realizes the lifting and lowering movement of the lifting cylinder, and the lifting cylinder takes air from the gas control box of the refueling vehicle, and the hand-operated two-position five-way valve is used to control the lifting of the 4-inch ground well connector by the double-acting lifting cylinder. A throttle valve is additionally installed at the hand-operated two-position five-way valve to control the lifting speed. When the operator holds the dumb Dan control valve to fill, the gas path of the 4-inch ground well connector lifting cylinder is cut off, interlock is formed, and the risk of misoperation in the process of filling is prevented.

[0010] Further, the lifting support comprises a mounting frame, a support frame and a first connecting rod; the mounting part is arranged on the mounting frame, the mounting frame is sleeved on the ground well connector through the mounting part; one end of the support frame is rotatably connected with the mounting frame, and the other end is the supporting part; one end of the first connecting rod is rotatably connected with the support frame, and the other end is connected with one end of the lifting cylinder, and the other end of the lifting cylinder is rotatably connected with the mounting frame. The mounting part of the mounting frame is fixed on the ground well connector, one end of the support frame is rotatably connected with the mounting frame, and the other end is used for supporting on the ground. When the piston rod of the lifting cylinder extends, the distance between the first connecting rod and the mounting frame gradually increases, and in this process, the support frame gradually rotates in the clockwise direction. Since one end of the support frame is connected with the mounting frame, this end connected with the mounting frame is subjected to an upward lifting force during the rotation of the support frame, thereby gradually lifting the ground well connector, and the ground well connector is automatically lifted. When the operation is completed, the cylinder operates in the reverse direction, the piston rod is retracted, one end of the supporting part of the support frame rotates counterclockwise, and the mounting frame gradually falls back to the original position.

[0011] Further, the lifting support further comprises a second connecting rod, one end of the second connecting rod is rotatably connected with the support frame, and the other end is rotatably connected with the mounting frame; one end of the first connecting rod connected with the mounting frame is located between the second connecting rod and the mounting part, and one end of the first connecting rod connected with the support frame is located between the second connecting rod and the mounting frame. Through the arrangement of the second connecting rod, the ground well connector can be subjected to a greater lifting force when the lifting cylinder extends a short distance, which can not only reduce the size of the entire lifting device, but also make the lifting and falling process more stable.

[0012] Further, the mounting frame comprises a hoop, a first support, a second support, a first crossbar and a second crossbar, two sides of the hoop are connected with the first support and the second support respectively, two ends of the first crossbar and two ends of the second crossbar are connected with the first support and the second support respectively, and the first crossbar is located between the second crossbar and the hoop; one end of the lifting cylinder is rotatably connected with the first crossbar, and one end of the second connecting rod is rotatably connected with the second crossbar. The first support and the second support are vertically arranged, the hoop, the first crossbar and the second crossbar are arranged between the first support and the second support, the hoop is used for mounting and fixing with the ground well connector, the first crossbar is used for mounting the lifting cylinder, the cylinder of the lifting cylinder is rotatably sleeved on the first crossbar through a shaft sleeve, and the piston rod of the lifting cylinder is fixedly connected with the first connecting rod; one end of the second connecting rod is hinged with the second crossbar, and the other end is hinged with the supporting part of the support frame.

[0013] Further, the first connecting rod is provided with two groups, the lifting cylinder is provided with two groups, and each group of the first connecting rod is connected with a group of the lifting cylinder; and the two groups of the first connecting rod are arranged in parallel and are spaced apart. The second connecting rod is provided with two groups, and the two groups of the second connecting rod are arranged in parallel and are spaced apart. The two groups of first connecting rods are located on the two sides of the ground well connector, and the two groups of second connecting rods are also located on the two sides of the ground well connector, so that the ground well connector is more balanced in stress, and the ground well connector is better and faster lifted.

[0014] Further, the support portion is provided with a roller for being supported on the ground. In an initial state, the support portion is not in contact with the ground and is suspended in the air. When the piston rod of the lifting cylinder is extended and moves, the support portion moves clockwise around the mounting frame (i.e. the hinge point of the support frame and the mounting frame), and the support portion gradually comes into contact with the ground. After contact, the support portion continues to rotate, thereby lifting the ground well connector. The roller can reduce the friction between the support portion and the ground.

[0015] Further, the mounting frame further comprises a hand-held handle. The hand-held handle is arranged to facilitate the operator to install or carry the lifting device.

[0016] Compared with the prior art, the lifting device has the following beneficial effects:

[0017] The lifting device for the ground well connector realizes automatic lifting operation of the ground well connector and reduces the working strength of the operator. On the other hand, the gas circuit is additionally arranged on the refueling vehicle and is communicated with the gas control box of the refueling vehicle to provide compressed gas for the lifting cylinder. The connection relationship between the two-position three-way valve and the gas circuit is arranged to automatically cut off the gas source of the lifting cylinder when the operator holds the Daimler control valve to refuel, thereby forming interlocking and effectively avoiding lifting of the ground well connector during refueling. The risk of misoperation during refueling is reduced, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of the lifting device of the utility model;

[0019] Figure 2 Fig. 2 is a first perspective view of the lifting device installed on the ground well connector;

[0020] Figure 3 Fig. 3 is a second perspective view of the lifting device installed on the ground well connector;

[0021] Figure 4 Fig. 4 is a structural schematic view of the entire gas circuit system of the refueling vehicle, wherein the thick solid line is a gas circuit diagram of the utility model.

[0022] In the attached diagram: 1. Lifting cylinder; 2. Two-position three-way valve; 3. Throttle valve; 4. Two-position five-way valve; 5. Mounting bracket; 6. Support frame; 7. First connecting rod; 8. Second connecting rod; 9. Clamp; 10. First bracket; 11. Second bracket; 12. First crossbar; 13. Second crossbar; 14. Roller; 15. Handle; 16. Well connector. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Example 1

[0026] This embodiment is a first embodiment of a lifting device for a well joint 16, such as... Figures 1 to 3 As shown, the device includes a lifting cylinder 1, a lifting bracket, and a lifting control assembly. The lifting bracket has a mounting part for mounting on the well joint 16 and a support part for supporting the ground. The lifting cylinder 1 is mounted on the lifting bracket and can drive the lifting bracket to lift the well joint 16. The lifting control assembly includes a two-position three-way valve 2. The inlet end of the two-position three-way valve 2 is used to connect with the outlet end of the gas control box of the refueling vehicle. The first outlet end of the two-position three-way valve 2 is used to connect with the end of the refueling vehicle equipped with a Dedemann control valve. The second outlet end of the two-position three-way valve 2 is used to connect with the lifting cylinder 1.

[0027] In this embodiment, the lifting control assembly also includes a throttle valve 3 for controlling the lifting speed. The throttle valve 3 is installed on the pipeline at the air inlet end of the lifting cylinder 1. The throttle valve 3 controls the flow rate through the lifting cylinder 1 by changing the throttling cross-section, thereby controlling the lifting speed.

[0028] In the embodiment, the lifting control assembly further comprises a hand control two-position five-way valve 4 for controlling the lifting or lowering of the lifting cylinder 1, the air inlet end of the two-position five-way valve 4 is communicated with the second outlet of the two-position three-way valve 2, and the positive action exhaust port and the reverse action exhaust port of the two-position five-way valve 4 are respectively communicated with the air inlet port and the air outlet port of the lifting cylinder 1. The lifting movement of the lifting cylinder 1 is realized by the two-position five-way valve 4, the lifting cylinder 1 takes air from the air control box of the vehicle, the double-acting lifting cylinder 1 is controlled to lift the 4-inch wellhead connector 16 by the hand control two-position five-way valve, and the throttle valve 3 is additionally arranged at the hand control two-position five-way valve 4 to control the lifting speed. When the hand control valve is held to add oil, the air path of the 4-inch wellhead connector 16 lifting cylinder 1 is cut off, interlocking is formed, and the risk of misoperation during the oil adding process is prevented.

[0029] The lifting device of the wellhead connector 16 is installed on the wellhead connector 16, the lifting of the lifting cylinder 1 is controlled, and the automatic lifting of the wellhead connector 16 is realized. The air source of the lifting cylinder 1 comes from the air control box of the vehicle, the inlet end of the two-position three-way valve 2 is communicated with the air outlet end of the air control box of the vehicle, the first outlet end of the two-position three-way valve 2 is communicated with one end of the hand control valve of the vehicle, and the second outlet end of the two-position three-way valve 2 is communicated with the lifting cylinder 1. In this way, when the hand control valve is held to add oil, the air path of the 4-inch wellhead connector 16 lifting cylinder 1 is cut off, interlocking is formed, and the risk of misoperation during the oil adding process is prevented. When the hand control valve does not work, the air source of the air control box is communicated with the lifting cylinder 1, the lifting of the wellhead connector 16 is realized, when the hand control valve works during oil adding, the air path A and the air path B of the two-position three-way valve 2 are cut off, Figure 4 and the air path A and the air path C of the air control box are communicated with the hand control valve, interlocking is realized. Figure 4 The lifting device of the wellhead connector 16 provided by the utility model realizes interlocking through the setting of the air path communicated with the lifting cylinder 1 and the two-position three-way valve 2 on the existing oiling vehicle, can effectively avoid misoperation of the operator, and avoids lifting the wellhead connector 16 during the oil adding process.

[0030] The lifting device of the wellhead connector 16 provided by the utility model realizes interlocking through the setting of the air path communicated with the lifting cylinder 1 and the two-position three-way valve 2 on the existing oiling vehicle, can effectively avoid misoperation of the operator, and avoids lifting the wellhead connector 16 during the oil adding process.

[0031] Embodiment two

[0032] This embodiment is a second embodiment of the ground well connector 16 lifting device, which is similar to the first embodiment, but the difference is that in this embodiment, as shown in Figures 1 to 3 the specific structure of the lifting support is provided, which includes a mounting frame 5, a support frame 6 and a first connecting rod 7; the mounting portion is provided on the mounting frame 5, and the mounting frame 5 is sleeved on the ground well connector 16 through the mounting portion; one end of the support frame 6 is rotationally connected with the mounting frame 5, and the other end is a supporting portion; one end of the first connecting rod 7 is rotationally connected with the support frame 6, and the other end is connected with one end of the lifting cylinder 1, and the other end of the lifting cylinder 1 is rotationally connected with the mounting frame 5. The mounting portion of the mounting frame 5 is fixed on the ground well connector 16, one end of the support frame 6 is rotationally connected with the mounting frame 5, and the other end is used to support on the ground. When the piston rod of the lifting cylinder 1 is extended, the distance between the first connecting rod 7 and the mounting frame 5 gradually increases, and in this process, the support frame 6 gradually rotates in the clockwise direction. Since one end of the support frame 6 is connected with the mounting frame 5, this end connected with the mounting frame 5 is subjected to an upward lifting force during the rotation process, thereby gradually lifting the ground well connector 16, and realizing automatic lifting of the ground well connector 16. When the operation is completed, the cylinder operates in the reverse direction, the piston rod is retracted, the supporting portion of the support frame 6 rotates counterclockwise, and the mounting frame 5 gradually falls back to the original position.

[0033] In this embodiment, the lifting support further includes a second connecting rod 8, one end of the second connecting rod 8 is rotationally connected with the support frame 6, and the other end is rotationally connected with the mounting frame 5; one end of the first connecting rod 7 connected with the mounting frame 5 is located between the second connecting rod 8 and the mounting portion, and the other end of the first connecting rod 7 connected with the support frame 6 is located between the second connecting rod 8 and the mounting frame 5. Through the arrangement of the second connecting rod 8, the lifting cylinder 1 can be extended for a short distance to make the ground well connector 16 subjected to a greater lifting force, which can not only reduce the size of the entire lifting device, but also make the lifting and falling process more stable.

[0034] In this embodiment, a roller 14 is provided on the supporting portion for supporting on the ground. In the initial state, the supporting portion is not in contact with the ground and is suspended in the air. When the piston rod of the lifting cylinder 1 is extended, the supporting portion makes a clockwise movement with the mounting frame 5 as the center (i.e. the hinge point of the support frame 6 and the mounting frame 5), and gradually comes into contact with the ground. After contact, it continues to rotate, thereby lifting the ground well connector 16. The arrangement of the roller 14 can reduce the friction between the supporting portion and the ground.

[0035] Embodiment three

[0036] This embodiment is a third embodiment of the ground well connector 16 lifting device, which is similar to the first embodiment, but the difference is that in this embodiment, as shown in Figures 1 to 3As shown, the mounting frame 5 comprises a hoop 9, a first support 10, a second support 11, a first crossbar 12 and a second crossbar 13, the two sides of the hoop 9 are connected with the first support 10 and the second support 11 respectively, the two ends of the first crossbar 12 and the two ends of the second crossbar 13 are connected with the first support 10 and the second support 11 respectively, and the first crossbar 12 is located between the second crossbar 13 and the hoop 9; one end of the lifting cylinder 1 is rotatably connected with the first crossbar 12, and one end of the second connecting rod 8 is rotatably connected with the second crossbar 13. The first support 10 and the second support 11 are vertically arranged, the hoop 9, the first crossbar 12 and the second crossbar 13 are arranged between the first support 10 and the second support 11, the hoop 9 is used for being fixedly installed with the ground well connector 16, the first crossbar 12 is used for installing the lifting cylinder 1, the cylinder of the lifting cylinder 1 is rotatably sleeved on the first crossbar 12 through a shaft sleeve, and the piston rod of the lifting cylinder 1 is fixedly connected with the first connecting rod 7; one end of the second connecting rod 8 is hingedly connected with the second crossbar 13, and the other end is hingedly connected with the supporting part of the supporting frame 6.

[0037] In the embodiment, two groups of the first connecting rod 7 are arranged, and two groups of the lifting cylinder 1 are arranged, and each group of the first connecting rod 7 is connected with one group of the lifting cylinder 1; and the two groups of the first connecting rod 7 are arranged in parallel and at intervals. Two groups of the second connecting rod 8 are arranged, and the two groups of the second connecting rod 8 are arranged in parallel and at intervals. The two groups of the first connecting rod 7 are located on the two sides of the ground well connector 16, and the two groups of the second connecting rod 8 are also located on the two sides of the ground well connector 16, so that the ground well connector 16 is more balanced in force, and the ground well connector 16 can be lifted better and faster.

[0038] In the embodiment, the mounting frame 5 further comprises a hand-held handle 15. The hand-held handle 15 is arranged to facilitate an operator to install or carry the lifting device.

[0039] In the specific content of the above specific embodiments, any combination of technical features can be combined without contradiction, and in order to make the description concise, not all possible combinations of the above technical features are described, but as long as the combination of technical features does not exist contradiction, it should be considered as the scope of the present application.

[0040] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wellhead joint lifting device, characterized in that, The system includes a lifting cylinder (1), a lifting bracket, and a lifting control assembly. The lifting bracket is provided with a mounting part for mounting on a ground well connector (16) and a support part for supporting on the ground. The lifting cylinder (1) is mounted on the lifting bracket and can drive the lifting bracket to lift the ground well connector (16). The lifting control assembly includes a two-position three-way valve (2). The inlet end of the two-position three-way valve (2) is used to connect with the outlet end of the gas control box of the refueling vehicle. The first outlet end of the two-position three-way valve (2) is used to connect with the end of the refueling vehicle equipped with a Dedemann control valve. The second outlet end of the two-position three-way valve (2) is used to connect with the lifting cylinder (1).

2. The well joint lifting device according to claim 1, characterized in that, The lifting control assembly also includes a throttle valve (3) for controlling the lifting speed, the throttle valve (3) being installed on the pipeline at the air inlet end of the lifting cylinder (1).

3. The well joint lifting device according to claim 2, characterized in that, The lifting control assembly also includes a manual two-position five-way valve (4) for controlling the lifting cylinder (1) to rise or fall. The air inlet of the two-position five-way valve (4) is connected to the second outlet of the two-position three-way valve (2). The positive and negative exhaust ports of the two-position five-way valve (4) are connected to the air inlet and outlet of the lifting cylinder (1), respectively.

4. The well joint lifting device according to any one of claims 1 to 3, characterized in that, The lifting bracket includes a mounting frame (5), a support frame (6), and a first connecting rod (7); the mounting part is provided on the mounting frame (5), and the mounting frame (5) is sleeved on the well joint (16) through the mounting part; one end of the support frame (6) is rotatably connected to the mounting frame (5), and the other end is the support part; one end of the first connecting rod (7) is rotatably connected to the support frame (6), and the other end is connected to one end of the lifting cylinder (1), and the other end of the lifting cylinder (1) is rotatably connected to the mounting frame (5).

5. The well joint lifting device according to claim 4, characterized in that, The lifting bracket also includes a second connecting rod (8), one end of which is rotatably connected to the support frame (6) and the other end is rotatably connected to the mounting frame (5); the first connecting rod (7) is located between the second connecting rod (8) and the mounting frame (5) at one end, and the first connecting rod (7) is located between the second connecting rod (8) and the mounting part at one end.

6. The well joint lifting device according to claim 5, characterized in that, The mounting bracket (5) includes a clamp (9), a first bracket (10), a second bracket (11), a first crossbar (12), and a second crossbar (13). The two sides of the clamp (9) are connected to the first bracket (10) and the second bracket (11) respectively. The two ends of the first crossbar (12) and the two ends of the second crossbar (13) are connected to the first bracket (10) and the second bracket (11) respectively. The first crossbar (12) is located between the second crossbar (13) and the clamp (9). One end of the lifting cylinder (1) is rotatably connected to the first crossbar (12), and one end of the second connecting rod (8) is rotatably connected to the second crossbar (13).

7. The well joint lifting device according to claim 6, characterized in that, The first connecting rod (7) is provided in two sets, and the lifting cylinder (1) is provided in two sets. Each set of the first connecting rod (7) is connected to one set of the lifting cylinder (1); and the two sets of the first connecting rod (7) are spaced apart and arranged in parallel.

8. The well joint lifting device according to claim 6, characterized in that, The second link (8) is provided in two sets, and the two sets of the second link (8) are arranged at intervals and in parallel.

9. The well joint lifting device according to claim 6, characterized in that, The support is provided with rollers (14) for supporting the ground.

10. The well joint lifting device according to claim 6, characterized in that, The mounting bracket (5) also includes a carrying handle (15).

Images