Elevator turnover device and using method thereof

Abstract

The invention discloses an elevator turnover device and a using method thereof, and relates to the technical field of well drilling equipment, in particular to an elevator turnover device and a using method thereof, the elevator turnover device comprises a telescopic main arm, a telescopic auxiliary arm, a tong head, a main arm shaft, an auxiliary arm shaft and a turnover mechanism, and the turnover mechanism is provided with a plurality of connecting pin holes; one end of the telescopic main arm and one end of the telescopic auxiliary arm are rotatably connected with a turnover mechanism through connecting pin holes, the tong head is connected to the turnover mechanism through at least two connecting pin holes, the other end of the telescopic main arm and the other end of the telescopic auxiliary arm are connected with a main arm shaft and an auxiliary arm shaft respectively, and the telescopic main arm and the telescopic auxiliary arm drive the tong head to move when stretching out and drawing back. And the horizontal angle of the turnover mechanism is not changed. The device has the advantages that through coordinated movement of the telescopic main arm and the telescopic auxiliary arm, the position of the tong head can be flexibly adjusted, and the operation requirements of drilling tools in different postures are met. The flexibility not only improves the operation efficiency, but also reduces the dependence on the skills of operators.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and in particular to an elevator flipping device and a use method thereof. Background Art

[0002] In the field of modern oil drilling equipment, elevators are an important part of the lifting system, and their main function is to receive drilling tools. In order to adapt to drilling tools in different postures, elevators need to be equipped with a flipping mechanism. However, the traditional elevator flipping device has many shortcomings:

[0003] Traditional elevators are connected by lifting rings, and there is a linkage relationship between the flip angle and the tilt angle of the lifting ring. In order to ensure that the tilt angle of the elevator and the drilling tool angle are adapted, two mechanisms are required for linkage control. This is usually done in two ways: sensor control: high cost and high control accuracy requirements; manual visual recognition: low degree of automation and low efficiency.

[0004] In order to keep the elevator horizontal in a free state, the following methods are generally used: Reasonably design the center of gravity position to keep it horizontal, but this method is difficult to achieve in a lightweight and miniaturized offline system. Rely on springs to keep the elevator horizontal. Due to the lightweight design, it is impossible to design a suitable spring. Keep the elevator horizontal through stroke control. This method relies on the flip device to forcibly keep it horizontal and lacks adaptability.

[0005] The offline system needs to complete the work of connecting and dropping the stand in the non-wellhead area, so the elevator part must be lightweight and miniaturized. The traditional flip mechanism is large and difficult to meet this requirement.

[0006] Traditional elevator flipping devices are complicated to operate and require professional maintenance and debugging, which increases the cost of use. Due to the complex structure, traditional elevator flipping devices are prone to failure, affecting work efficiency and safety. It is difficult to maintain and replace parts of traditional elevator flipping devices, which increases downtime and maintenance costs.

[0007] In order to solve the above problems, the present invention provides an elevator flipping device, which achieves higher flexibility, lower cost, higher precision and automation by improving structure and materials, while meeting the requirements of offline systems for lightweight and miniaturization. Summary of the invention

[0008] The present invention aims to overcome the above-mentioned shortcomings of the prior art and provides an elevator flipping device and a method of using the same.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A lifting card flipping device comprises: a telescopic main arm, a telescopic auxiliary arm, a clamp head, a main arm shaft, an auxiliary arm shaft and a flipping mechanism, wherein the flipping mechanism is provided with a plurality of connecting pin holes, one end of the telescopic main arm and the telescopic auxiliary arm is rotatably connected to the flipping mechanism through the connecting pin holes, the clamp head is connected to the flipping mechanism through at least two of the connecting pin holes, the other end of the telescopic main arm is movably connected to the main arm shaft, the other end of the telescopic auxiliary arm is movably connected to the auxiliary arm shaft, the upper and lower four connection points of the telescopic main arm and the telescopic auxiliary arm form a parallelogram structure, the telescopic main arm and the telescopic auxiliary arm drive the clamp head to move when they are extended and retracted, and the horizontal angle of the flipping mechanism does not change.

[0011] Furthermore, the flipping mechanism includes two groups, one end of the telescopic main arm is rotatably connected to the two groups of flipping mechanisms through the connecting pin hole, one end of the telescopic sub-arm is rotatably connected to the two groups of flipping mechanisms through the connecting pin hole, and the two groups of flipping mechanisms are respectively connected to both sides of the pliers head.

[0012] Further, it comprises a first connecting pin and a connecting rod system, and the flipping mechanism is rotatably connected to the clamp head through the first connecting pin;

[0013] The telescopic device is arranged in the flipping mechanism, and the telescopic device is connected to the pliers head through the connecting rod system, and is used for controlling the flipping mechanism to rotate along the first connecting pin.

[0014] Furthermore, the connecting rod system includes a first connecting rod and a second connecting rod, wherein one end of the first connecting rod is rotatably connected to the telescopic device, the other end is rotatably connected to the second connecting rod, and the middle part is rotatably connected to the flip mechanism housing;

[0015] The other end of the second connecting rod is rotatably connected to the clamp head.

[0016] Furthermore, the first connecting rod includes a front connecting rod and a rear connecting rod, and the front connecting rod and the rear connecting rod are connected at two points to form the first connecting rod.

[0017] Furthermore, it includes a sliding pin shaft, the front section connecting rod includes a side plate and a connecting plate, the front section connecting rod is assembled by two of the side plates and the connecting plate to form an "H" type structure, the side plate is provided with a middle hole and two side holes, the rear section connecting rod is provided with a middle bar hole and two side holes, the middle holes of the two side plates of the front section connecting rod are rotatably connected to one side hole of the rear section connecting rod and the flip mechanism housing through a pin shaft, and the side holes at one end of the two side plates of the front section connecting rod are connected to the middle bar hole of the rear section connecting rod through a sliding pin shaft.

[0018] Furthermore, the sliding pin matches the middle bar hole and can slide in the middle bar hole when the connecting rod system moves.

[0019] Furthermore, the telescopic device is arranged in the flip mechanism, and the flip mechanism is provided with the limit platform at the telescopic end of the telescopic device; the limit platform and / or the installation end of the telescopic device are provided with the detachable travel gasket.

[0020] Another technical solution adopted by the present invention is as follows:

[0021] A method for using an elevator flipping device comprises the following steps:

[0022] S1: When the elevator needs to move the clamp head, the clamp head is controlled to move by telescoping the telescopic main arm and the telescopic auxiliary arm;

[0023] S2: The vertical angle of the flip mechanism does not change during the movement;

[0024] S3: When the pliers head needs to be controlled to flip, the telescopic device provided in the flipping mechanism is activated, driving the first connecting rod to perform a lever movement, and then driving the second connecting rod, and the second connecting rod drives the pliers head to flip around the first connecting pin.

[0025] Another technical solution adopted by the present invention is as follows:

[0026] A method for using an elevator flipping device comprises the following steps:

[0027] D1: Calculate the travel of the telescopic mechanism, set a travel gasket on the limit platform and / or the installation end of the telescopic device, and control the maximum and minimum travel of the telescopic mechanism;

[0028] D2: When the elevator needs to move the clamp head, the clamp head is controlled to move by telescoping the telescopic main arm and the telescopic auxiliary arm;

[0029] D3: The vertical angle of the flip mechanism does not change during the movement;

[0030] D4: When the pliers head needs to be controlled to flip, the telescopic device provided in the flipping mechanism is activated, driving the first connecting rod to perform a lever movement, and then driving the second connecting rod, and the second connecting rod drives the pliers head to flip around the first connecting pin.

[0031] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0032] 1. The device can flexibly adjust the position of the clamp head through the coordinated movement of the telescopic main arm and the telescopic auxiliary arm to meet the operating requirements of drilling tools in different postures. This flexibility not only improves operating efficiency, but also reduces dependence on operator skills.

[0033] 2. Compared with traditional sensor control and manual operation, the present invention adopts a mechanical linkage system, which reduces costs and improves reliability. Since complex electronic components and control systems are reduced, maintenance costs are also reduced accordingly.

[0034] 3. Through the precisely designed connecting rod system and limit platform and / or stroke gasket, the control accuracy of the flip angle is ensured and human error is avoided. This high-precision control is essential to improve the safety and efficiency of drilling operations.

[0035] 4. The present invention realizes the automatic flipping function through the built-in telescopic device and connecting rod system, which greatly improves the automation level and reduces manual intervention. This not only improves the operating efficiency, but also reduces the operating risk.

[0036] 5. Aiming at the needs of offline systems, the present invention designs a lightweight and miniaturized elevator flipping device to meet the operation requirements of non-wellhead areas. This design makes the device easier to carry and install, while reducing the space occupied.

[0037] 6. The parallelogram structure and sliding pin design ensure the stability of the flip mechanism during operation and avoid unnecessary shaking. This stability helps to improve the accuracy and safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 It is a side view structural schematic diagram of the present invention;

[0040] Figure 3 It is a schematic diagram of the structure of the present invention;

[0041] Figure 4 is a cross-sectional view of the present invention in an expanded state;

[0042] Figure 5 It is a three-dimensional cross-sectional view of the turning mechanism of the present invention;

[0043] Figure 6 is a cross-sectional view of the present invention in a closed state;

[0044] Figure 7 It is a schematic diagram of the rear end connecting rod structure of the present invention;

[0045] Figure 8 It is a schematic diagram of the front end connecting rod structure of the present invention.

[0046] Markings in the figure:

[0047] 1-first connecting pin, 2-turning mechanism, 3-clamp head, 4-telescopic device, 5-first connecting rod, 6-second connecting rod, 7-front connecting rod, 8-rear connecting rod, 9-sliding pin, 10-side plate, 11-connecting plate, 12-middle hole, 13-side hole, 14-middle strip hole, 15-limiting platform, 16-stroke gasket, 17-telescopic main arm, 18-telescopic auxiliary arm, 19-main arm shaft, 20-auxiliary arm shaft.

[0048] Specific Examples

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] Example 1

[0052] In this embodiment, if Figure 1 , 2 As shown, a lifting card flipping device comprises: a telescopic main arm 17, a telescopic auxiliary arm 18, a clamp head 3, a main arm shaft 19, a auxiliary arm shaft 20 and a flipping mechanism 2, wherein the flipping mechanism 2 is provided with a plurality of connecting pin holes, one end of the telescopic main arm 17 and the telescopic auxiliary arm 18 is rotatably connected to the flipping mechanism 2 through the connecting pin holes, the clamp head 3 is connected to the flipping mechanism 2 through at least two connecting pin holes, the other ends of the telescopic main arm 17 and the telescopic auxiliary arm 18 are respectively connected to the main arm shaft 19 and the auxiliary arm shaft 20, the relative position between the main arm shaft 19 and the auxiliary arm shaft 20 is fixed, the upper and lower four connection points of the telescopic main arm 17 and the telescopic auxiliary arm 18 form a parallelogram structure, the telescopic main arm 17 and the telescopic auxiliary arm 18 drive the clamp head 3 to move when they are extended and retracted, and the horizontal angle of the flipping mechanism 2 does not change.

[0053] The device can flexibly adjust the position of the clamp head 3 through the coordinated movement of the telescopic main arm 17 and the telescopic auxiliary arm 18 to meet the operating requirements of drilling tools in different postures.

[0054] The parallelogram structure and the design of the sliding pin 9 ensure the stability of the flipping mechanism 2 during operation and avoid unnecessary shaking.

[0055] Furthermore, the flipping mechanism 2 includes two groups, one end of the telescopic main arm 17 is rotatably connected to the two groups of flipping mechanisms 2 through a connecting pin hole, one end of the telescopic sub-arm 18 is rotatably connected to the two groups of flipping mechanisms 2 through a connecting pin hole, and the two groups of flipping mechanisms 2 are respectively connected to both sides of the clamp head 3.

[0056] In view of the requirements of the offline system, the present invention designs a lightweight and miniaturized elevator flipping device to meet the operation requirements of non-wellhead areas.

[0057] Specifically, the telescopic main arm 17 and the telescopic auxiliary arm 18 both adopt a split structure. The telescopic main arm 17 includes two arms, which are respectively connected to the two sides of the flipping mechanism 2. The telescopic auxiliary arm 18 similarly includes two arms, which are respectively connected to the two sides of the flipping mechanism 2. Their hydraulic systems are independent. After one of them fails, it can continue to work by relying on the other hydraulic device.

[0058] In other embodiments, the telescopic main arm 17 and the telescopic auxiliary arm 18 are preferably controlled by a hydraulic rod, the end of which adopts a forked structure, and the forked heads are respectively connected to the two sides of the flipping mechanism 2. The advantage is that it saves costs. At the same time, the use of a hydraulic rod can make the flipping mechanism 2 run more synchronously and improve its working stability.

[0059] The elevator flipping device of the present invention is suitable for various drilling environments and operating conditions, and can provide reliable performance support regardless of land drilling or offshore drilling.

[0060] Further, it comprises a first connecting pin 1 and a connecting rod system, and the flipping mechanism 2 is rotatably connected to the clamp head 3 through the first connecting pin 1;

[0061] A telescopic device 4 is provided in the turning mechanism 2 . The telescopic device 4 is connected to the clamp head 3 through a connecting rod system and is used to control the turning mechanism 2 to rotate along the first connecting pin shaft 1 .

[0062] This design enables the flipping mechanism 2 to flexibly adjust the flipping angle of the clamp head 3 to adapt to drilling tools in different postures, thereby significantly improving the overall efficiency of the drilling operation.

[0063] Furthermore, the connecting rod system includes a first connecting rod 5 and a second connecting rod 6, one end of the first connecting rod 5 is rotatably connected to the telescopic device 4, the other end is rotatably connected to the second connecting rod 6, and the middle part is rotatably connected to the housing of the flip mechanism 2;

[0064] The end of the second connecting rod 6 is rotatably connected to the clamp head 3 .

[0065] Furthermore, the first connecting rod 5 includes a front connecting rod 7 and a rear connecting rod 8 , and the front connecting rod 7 and the rear connecting rod 8 are connected at two points to form the first connecting rod 5 .

[0066] This segmented design allows for finer angle adjustment, enhancing the versatility and adaptability of the device.

[0067] Furthermore, it includes a sliding pin shaft 9, the front section connecting rod 7 includes a side plate 10 and a connecting plate 11, the front section connecting rod 7 is assembled by two side plates 10 and the connecting plate 11 to form an "H" type structure, the side plate 10 is provided with a middle hole 12 and two side holes 13, the rear section connecting rod 8 is provided with a middle bar hole 14 and two side holes 13, the middle hole 12 of the two side plates 10 of the front section connecting rod 7 is rotatably connected to the one side hole 13 of the rear section connecting rod 8 and the outer shell of the flip mechanism 2 through a pin shaft, and the side hole 13 at one end of the two side plates 10 of the front section connecting rod 7 is connected to the middle bar hole 14 of the rear section connecting rod 8 through a sliding pin shaft 9.

[0068] This structural design simplifies the manufacturing and maintenance process and reduces production and operating costs.

[0069] Furthermore, the sliding pin 9 matches the middle bar hole 14 and can slide in the middle bar hole 14 when the connecting rod system moves.

[0070] The margin of the middle strip hole 14 is the free compensation degree after the elevator is turned over.

[0071] This design ensures the stability and precision of the turning mechanism 2 during movement, and improves the accuracy and reliability of the operation.

[0072] Furthermore, the telescopic device 4 is arranged in the flip mechanism 2, and the flip mechanism 2 is provided with a limit platform 15 at the telescopic end of the telescopic device 4; the limit platform 15 and / or the installation end of the telescopic device 4 are provided with a detachable travel gasket 16.

[0073] The setting of the limit platform 15 optimizes the space utilization, so that the turnover mechanism 2 can operate efficiently even in a limited space; the design of the stroke gasket 16 improves the control accuracy and ensures the accurate docking of the elevator and the drilling tool.

[0074] Example 2

[0075] A method for using an elevator flipping device comprises the following steps:

[0076] S1: When the elevator needs to move the clamp head 3, the clamp head 3 is controlled to move by telescoping the telescopic main arm 17 and the telescopic auxiliary arm 18;

[0077] S2: The vertical angle of the flip mechanism 2 does not change during the movement;

[0078] S3: When the pliers head 3 needs to be controlled to flip, the telescopic device 4 provided in the flipping mechanism 2 is started, driving the first connecting rod 5 to perform a lever movement, and then driving the second connecting rod 6, and the second connecting rod 6 drives the pliers head 3 to flip around the first connecting pin 1.

[0079] Example 3

[0080] A method for using an elevator flipping device comprises the following steps: D1: calculating the travel of a telescopic mechanism, setting a travel gasket 16 on a limit platform 15 or / and a mounting end of a telescopic device 4, and controlling the maximum and minimum travel of the telescopic mechanism;

[0081] D2: When the elevator needs to move the clamp head 3, the clamp head 3 is controlled to move by telescopic main arm 17 and telescopic auxiliary arm 18;

[0082] D3: The vertical angle of the flip mechanism 2 does not change during the movement;

[0083] D4: When the pliers head 3 needs to be controlled to flip, the telescopic device 4 provided in the flipping mechanism 2 is started, driving the first connecting rod 5 to perform a lever movement, and then driving the second connecting rod 6, and the second connecting rod 6 drives the pliers head 3 to flip around the first connecting pin 1.

[0084] The method of using embodiments 2 and 3 specifically comprises the following steps:

[0085] Step 1: Calculate the travel of the telescopic mechanism: When the elevator flip device is needed, first calculate the required travel length of the telescopic main arm 17 and the telescopic auxiliary arm 18 according to the specific needs of the drilling operation. This step is the key to ensure that the device can adapt to different operating environments.

[0086] Step 2: Control the telescopic device 4 to extend and retract: The operator controls the telescopic drive mechanism (such as a hydraulic cylinder or an electric push rod) on the device to extend and retract the telescopic main arm 17 and the telescopic auxiliary arm 18 according to a predetermined stroke length. During the telescopic process, the telescopic main arm 17 and the telescopic auxiliary arm 18 rotate along the connecting pin hole on the flip mechanism 2, thereby changing the position and posture of the clamp head 3.

[0087] Step 3: The turning mechanism 2 remains horizontal: During the extension and retraction of the telescopic main arm 17 and the telescopic auxiliary arm 18, the turning mechanism 2 always remains horizontal with the ground or the working platform through its internal mechanical structure and limit device, which helps to ensure the stability and accuracy of the device during operation.

[0088] Step 4: Adjust the position of the clamp head 3: With the extension and retraction of the telescopic main arm 17 and the telescopic auxiliary arm 18, the clamp head 3 will automatically adjust to a suitable position according to the preset program and parameters. The operator can understand the current position and status of the clamp head 3 by observing the indicator light or display screen on the device.

[0089] Step 5: Complete the operation task: When the clamp head 3 is adjusted to a suitable position, the operator can start to perform relevant tasks in the drilling operation, such as connecting the stand, throwing the stand, etc. During the operation, if the position or posture of the clamp head 3 needs to be further adjusted, the operator can operate it at any time through the buttons or touch screen on the control device.

[0090] Step 6: Disassembly and maintenance: After the drilling operation is completed, the operator needs to disassemble and clean the elevator flip device. If the device is found to be faulty or damaged during use, the operator needs to contact professional maintenance personnel in time for repair or replacement of parts. At the same time, in order to ensure the long-term stable operation of the device, the operator also needs to regularly perform maintenance and maintenance on it.

[0091] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention should be included in the protection scope of the invention.

Claims

1. An elevator flipping device, characterized in that: include: A telescopic main arm (17), a telescopic auxiliary arm (18), a clamp head (3), a main arm shaft (19), an auxiliary arm shaft (20) and a turning mechanism (2), wherein the turning mechanism (2) is provided with a plurality of connecting pin holes, one end of the telescopic main arm (17) and the telescopic auxiliary arm (18) are rotatably connected to the turning mechanism (2) through the connecting pin holes respectively, the clamp head (3) is connected to the turning mechanism (2) through at least two connecting pin holes, the other end of the telescopic main arm (17) is movably connected to the main arm shaft (19), the other end of the telescopic auxiliary arm (18) is movably connected to the auxiliary arm shaft (20), the upper and lower four connection points of the telescopic main arm (17) and the telescopic auxiliary arm (18) form a parallelogram structure, the telescopic main arm (17) and the telescopic auxiliary arm (18) drive the clamp head (3) to move when they are telescoped, and the horizontal angle of the turning mechanism (2) does not change.

2. The elevator flipping device according to claim 1, characterized in that: The flipping mechanism (2) comprises two groups, one end of the telescopic main arm (17) is rotatably connected to the two groups of the flipping mechanism (2) through a connecting pin hole, one end of the telescopic auxiliary arm (18) is rotatably connected to the two groups of the flipping mechanism (2) through a connecting pin hole, and the two groups of the flipping mechanism (2) are respectively connected to the two sides of the pliers head (3).

3. The elevator flipping device according to claim 1, characterized in that: It comprises a first connecting pin (1) and a connecting rod system, wherein the flipping mechanism (2) is rotatably connected to the pliers head (3) via the first connecting pin (1); A telescopic device (4) is provided in the flipping mechanism (2); the telescopic device (4) is connected to the pliers head (3) via the connecting rod system and is used to control the flipping mechanism (2) to rotate along the first connecting pin (1).

4. The elevator flipping device according to claim 3, characterized in that: The connecting rod system comprises a first connecting rod (5) and a second connecting rod (6); one end of the first connecting rod (5) is rotatably connected to the telescopic device (4), the other end is rotatably connected to one end of the second connecting rod (6), and the middle part is rotatably connected to the outer shell of the flip mechanism (2); The other end of the second connecting rod (6) is rotatably connected to the pliers head (3).

5. The elevator flipping device according to claim 4, characterized in that: The first connecting rod (5) comprises a front connecting rod (7) and a rear connecting rod (8), and the front connecting rod (7) and the rear connecting rod (8) are connected at two points to form the first connecting rod (5).

6. The elevator flipping device according to claim 5, characterized in that: The invention comprises a sliding pin shaft (9), the front connecting rod (7) comprises a side plate (10) and a connecting plate (11), the front connecting rod (7) is assembled by two side plates (10) and the connecting plate (11) to form an "H"-shaped structure, the side plate (10) is provided with a middle hole (12) and two side holes (13), the rear connecting rod (8) is provided with a middle bar hole (14) and two side holes (13), the middle holes (12) of the two side plates are rotatably connected to a side hole (13) of the rear connecting rod (8) and a housing of a turning mechanism (2) through a pin shaft, the side holes at one end of the two side plates are hinged to one end of the telescopic device, and the side holes (13) at the other end of the two side plates are connected to the middle bar hole (14) of the rear connecting rod (8) through the sliding pin shaft (9).

7. The elevator flipping device according to claim 6, characterized in that: The sliding pin shaft (9) matches the middle bar hole (14) and can slide in the middle bar hole (14) when the connecting rod system moves.

8. The elevator flipping device according to claim 1, characterized in that: The telescopic device (4) is arranged in the turning mechanism (2), and the turning mechanism (2) is provided with a limit platform (15) at the telescopic end of the telescopic device (4); the limit platform (15) and / or the installation end of the telescopic device (4) are provided with a detachable travel gasket (16).

9. A method for using an elevator card turning device, applied to an elevator card turning device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: When the elevator needs to move the clamp head (3), the clamp head (3) is controlled to move by telescoping the telescopic main arm (17) and the telescopic auxiliary arm (18); S2: During the movement, the vertical angle of the flipping mechanism (2) does not change; S3: When it is necessary to control the pliers head (3) to flip, the telescopic device (4) provided in the flipping mechanism (2) is activated, driving the first connecting rod (5) to perform a lever movement, thereby driving the second connecting rod (6), and the second connecting rod (6) drives the pliers head (3) to flip around the first connecting pin (1).

10. A method for using an elevator card turning device, applied to the elevator card turning device according to claim 8, characterized in that: The following steps are involved: D1: Calculate the travel of the telescopic mechanism, and set a travel gasket (16) on the mounting end of the limit platform (15) and / or the telescopic device (4) to control the maximum and minimum travel of the telescopic mechanism; D2: When the elevator needs to move the clamp head (3), the clamp head (3) is controlled to move by telescoping the telescopic main arm (17) and the telescopic auxiliary arm (18); D3: The vertical angle of the flipping mechanism (2) does not change during the movement; D4: When it is necessary to control the pliers head (3) to flip, the telescopic device (4) provided in the flipping mechanism (2) is activated, driving the first connecting rod (5) to perform a lever movement, thereby driving the second connecting rod (6), and the second connecting rod (6) drives the pliers head (3) to flip around the first connecting pin (1).

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