Wellhead clamping device of sucker rod pneumatic slip

Abstract

The invention relates to the field of petroleum and natural gas well drilling and well repairing equipment, and provides a wellhead clamping device of a sucker rod pneumatic slip. The device comprises a supporting base, a pneumatic assembly and slips, the supporting base is composed of supporting rods, a top plate and a base, a communicating hole is formed in the middle, and the slips and the supporting rods are distributed in a staggered mode. The upper movable plate is driven by the air cylinder, and opening and closing of the slips are achieved through the connecting rod mechanism and the four-point parallel mechanism. And the annular hoop below the slips can enhance the clamping effect and realize gravity self-locking. Compared with the prior art, the four-point parallel mechanism has the remarkable advantages that the four-point parallel mechanism ensures synchronous and stable clamping of the slips, and the sucker rod is prevented from being damaged; the clamping reliability is improved through the double-stroke design; the slip blocks are modularized to facilitate replacement and maintenance; the arc-shaped groove increases the clamping force and reduces the damage to the rod body; the design of the upper slip and the lower slip can prevent failure or damage caused by clamping the centralizing block, is suitable for sucker rods with different diameters, and effectively solves many problems of an existing wellhead clamping technology.

Description

Technical Field

[0001] The invention relates to the field of oil and natural gas drilling and well repairing equipment, and in particular to a wellhead clamping device for a sucker rod pneumatic slip. Background Art

[0002] In oilfield production operations, the wellhead device is crucial for the clamping operation of the sucker rod. However, the existing wellhead clamping technology has many problems and is difficult to meet the actual needs when dealing with sucker rods with a straightening block (diameter of about 62mm) and a rod diameter of 16~25mm.

[0003] On the one hand, the currently used clamping blocks have the problem of large radial displacement during the clamping process. When moving radially, the cava is easy to clamp the righting block, which may cause damage to the device and the righting block. On the other hand, when the cava moves axially, once it encounters the righting block, it will also pose a risk of damage to the device and the righting block, seriously affecting the safety of wellhead operations and the reliability of the device.

[0004] In addition, the existing technology cannot achieve effective selective avoidance according to the characteristics of different parts of the sucker rod, and cannot achieve flexible handling of different situations, resulting in low operating efficiency and easy to cause equipment failure. Therefore, in actual operations, a new wellhead clamping technology is urgently needed.

[0005] Therefore, it is necessary to provide a wellhead clamping device for a sucker rod pneumatic slip to solve the above technical problems. Summary of the invention

[0006] In order to overcome the above problems, the present invention provides a wellhead clamping device for a sucker rod pneumatic slip.

[0007] The technical implementation scheme of the present invention is a wellhead clamping device for a sucker rod pneumatic slip, comprising a support seat, a pneumatic assembly and a slip, the support seat comprising a support rod, a top plate and a base, a connecting hole being provided in the middle of the support seat; slips are provided in the support seat along the circumference with the connecting hole as the center, at least two support rods are fixed to the inner circumference of the support seat staggered with the slips, springs are sleeved on the separated support rods, and a lower movable plate is sleeved on the support rod at the upper end of the spring; an upper movable plate is installed in the support seat above the lower movable plate, a cylinder is installed in the support seat, a power output end of the cylinder is connected to the upper movable plate and drives the upper movable plate to move up and down; the slip comprises a slip end and a slip handle; the slip handle is fixed horizontally On the outer side of the upper end of the cava end; a hinge point 1 is provided at the inner end of the cava handle, and a triple plate is hinged on the hinge point 1, and a main support hinge point and an inner push hinge point are respectively provided at the other end of the triple plate, and the inner push hinge point is located below the outer side of the main support hinge point; the main support hinge point is installed on the hinge seat on the inner side of the bottom of the lower movable plate through a pin shaft; the inner push hinge point is hinged to the upper movable plate with a connecting rod II; a hinge point 2 is provided at the outer end of the cava handle, and a connecting rod I is hinged on the hinge point 2, and an auxiliary support hinge point is provided at the other end of the connecting rod I, and the auxiliary support hinge point is installed on the hinge seat on the outer side of the bottom of the lower movable plate through a pin shaft; a four-point parallel mechanism is formed between the hinge point 1, the main support hinge point, the hinge point 2 and the auxiliary support hinge point.

[0008] Preferably, an annular hoop is provided below the slip, a circular through hole is opened at the center of the annular hoop, a chamfer is provided at the top of the circular through hole of the annular hoop, and the annular hoop is fixedly connected to the center of the base.

[0009] Preferably, the upper movable plate is evenly distributed on the circumference of the upper movable plate with upper movable plate sleeves, and the upper movable plate sleeve is fixedly connected to the upper movable plate; the lower movable plate is evenly distributed on the circumference of the lower movable plate with lower movable plate sleeves, and the lower movable plate sleeve is fixedly connected to the lower movable plate; the upper movable plate sleeve and the lower movable plate sleeve are both sleeved on the support rod, and the bottom end of the upper movable plate sleeve passes through the lower movable plate, and the top end of the lower movable plate sleeve passes through the upper movable plate.

[0010] Preferably, the auxiliary support hinge point on the connecting rod I is hinged and fixed to the bottom of the lower movable plate, the connecting rod II passes through the lower movable plate and is hinged and fixed to the bottom of the upper movable plate, the hinge point 2 of the connecting rod I is hinged and fixed to the left end of the cava frame, the other end of the connecting rod II is hinged and fixed to the inward push hinge point of the triple plate, the main support hinge point of the triple plate is hinged and fixed to the lower movable plate, the hinge point 1 at the lower end of the triple plate is hinged and fixed to the right end of the cava frame, the cava frame is hollow, and a cava block is bolted to the rightmost end of the cava frame.

[0011] Preferably, the pneumatic assembly includes a cylinder and a cylinder fixing plate; the telescopic end of the cylinder is fixedly connected to the cylinder fixing plate, and the cylinder fixing plate is fixedly connected to a side of the upper movable plate close to the lower movable plate.

[0012] Preferably, the cylinder is located between the support rods in the support seat.

[0013] Preferably, a circular through hole with the same diameter as the circular through hole of the annular hoop is opened at the center of the top plate, the base, the upper movable plate and the lower movable plate.

[0014] Preferably, the side of the slip frame above the annular hoop away from the slip block is provided with an inclined surface inclined toward the slip block, the bottom of the slip block is provided with an upwardly inclined surface, and the surface of the slip block away from the triple plate is provided with an arc groove.

[0015] Preferably, the centers of the three groups of slips above the annular hoop coincide with the center of the annular hoop.

[0016] Preferably, the wellhead clamping device of the sucker rod pneumatic slips comprises two sucker rod pneumatic slips, which are installed together up and down and the distance between the two sucker rod pneumatic slips is greater than or equal to the length of the straightening block on the sucker rod.

[0017] Compared with the prior art, the present invention has the following advantages: 1. Sucker rod pneumatic slips The four-point parallel mechanism formed by hinge point 1, main support hinge point, hinge point 2 and auxiliary support hinge point ensures the synchronization and stability of the slip during the clamping process. This design allows the slip to be evenly stressed, avoiding damage to the sucker rod due to uneven stress; in the first stroke, the slip block fits the sucker rod to complete the initial clamping; in the second stroke, the slip block is further pressed down, and an inward component of force is generated through the chamfered slope of the annular hoop, which enhances the clamping effect and realizes gravity self-locking. This double-stroke design improves the reliability and safety of clamping; the slip block is fixed to the slip frame by bolts, which is easy to replace and maintain. This modular design reduces maintenance costs and improves the durability of the device; the arc-shaped groove on the slip block increases the contact area with the sucker rod, improves the clamping force, and reduces damage to the sucker rod surface during the clamping process.

[0018] 2. Wellhead clamping device The upper and lower sucker rod pneumatic slips are used to ensure that at least one group of slips can avoid the straightening block on the sucker rod and be clamped directly on the rod body. This design effectively prevents the clamping failure or equipment damage caused by a single slip when encountering the straightening block; the chamfered slope of the annular hoop generates an inward component when the slip is pressed down, which enhances the clamping effect, realizes gravity self-locking, and improves the stability and reliability of the clamping; the upper movable plate is driven by a cylinder, and the synchronous movement of the slip is achieved through a connecting rod mechanism. Pneumatic drive has the advantages of fast response speed and high control accuracy, and is suitable for wellhead working environments with frequent operations; the cylinder is located between the support rods, with a compact structure and space saving. At the same time, the design of the upper movable plate sleeve and the lower movable plate sleeve ensures that the upper and lower movable plates do not interfere with each other during movement, improving the stability and reliability of the device; the top plate, base, upper movable plate and lower movable plate are all provided with circular through holes with the same diameter as the circular through hole of the annular hoop at the center, which ensures the passability of the sucker rod and is suitable for sucker rods of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the best structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the slip of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the cava clamping of the present invention.

[0024] Figure 6 It is a schematic diagram of the structure of the slips of the present invention when they are opened.

[0025] Figure 7 This is a working schematic diagram of clamping the sucker rod of the present invention.

[0026] The meanings of the reference numerals in the figure are as follows: 1. top plate; 2. upper movable plate; 3. lower movable plate; 401. connecting rod II; 402. triple plate; 403. slip block; 404. slip frame; 405. connecting rod I; 5. spring; 6. base; 7. cylinder; 8. support rod; 9. annular hoop; 10. upper movable plate sleeve; 11. lower movable plate sleeve; 12. cylinder fixing plate; 13. sucker rod; 41. hinge point one; 42. inner push hinge point; 43. main support hinge point; 44. hinge point two; 45. auxiliary support hinge point. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments: See also Figures 1 to 4 A wellhead clamping device for sucker rod pneumatic slips, comprising a support seat, a pneumatic assembly and slips, characterized in that the support seat comprises a support rod 8, a top plate 1 and a base 6, and a connecting hole is provided in the middle of the support seat; slips are provided in the support seat along the circumference with the connecting hole as the center, and at least two support rods 8 are fixed to the inner circumference of the support seat staggered with the slips, and springs 5 ​​are sleeved on the separated support rods 8, and a lower movable plate 3 is sleeved on the support rod 8 at the upper end of the spring 5; an upper movable plate 2 is installed in the support seat above the lower movable plate 3, and a cylinder 7 is installed in the support seat, and the power output end of the cylinder 7 is connected to the upper movable plate 2 and drives the upper movable plate 2 to move up and down; the slip comprises a slip end and a slip handle; the slip handle is horizontally fixed to the outer side of the upper end of the slip end; the inner end of the slip handle is provided with A hinge point 41 is hinged with a triple plate 402, and the other end of the triple plate 402 is respectively provided with a main support hinge point 43 and an inner push hinge point 42, and the inner push hinge point 42 is located below and outside the main support hinge point 43; the main support hinge point 43 is installed on the hinge seat on the inner side of the bottom of the lower movable plate 3 through a pin shaft; the inner push hinge point and the upper movable plate 2 are hinged with a connecting rod II401; a hinge point 2 44 is provided at the outer end of the cava handle, and a connecting rod I405 is hinged on the hinge point 2 44, and the other end of the connecting rod I405 is provided with an auxiliary support hinge point 45, and the auxiliary support hinge point 45 is installed on the hinge seat on the outer side of the bottom of the lower movable plate 3 through a pin shaft; a four-point parallel mechanism is formed between the hinge point 41, the main support hinge point 43, the hinge point 2 44 and the auxiliary support hinge point 45.

[0029] Among them, the slips distributed along the circumference with the connecting hole as the center in the support seat can clamp the sucker rod 13, and make the sucker rod 13 evenly stressed during the clamping process, avoiding the damage of the sucker rod 13 caused by uneven stress during the clamping process; at least two support rods 8 fixed on the circumference of the support seat are staggered with the slips, so that the slips will not be affected during the working process, thereby ensuring the stability of the device; since springs 5 ​​are sleeved on the separated support rods 8, and a lower movable plate 3 is sleeved on the support rod 8 at the upper end of the spring 5, the spring 5 can make the lower movable plate 3 evenly stressed during the working process, and the support rod 8 serves as a rigid guide rail for the upper movable plate 2, the lower movable plate 3 and the spring 5; hinge point one 41, main support hinge point 43, hinge point two The four-point parallel mechanism formed between 44 and the auxiliary support hinge point 45 is connected to the upper movable plate 2 and the lower movable plate 3, and the power output end of the cylinder 7 is connected to the upper movable plate 2 and drives the upper movable plate 2 to move up and down. The cylinder 7 drives the upper movable plate 2 to move downward and drives the cava to move horizontally until the cava and the sucker rod 13 are in contact with each other to complete the first stroke. Under the action of the spring 5, the lower movable plate 3 does not move first until the upper movable plate 2 begins to squeeze the lower movable plate 3. The cylinder 7 overcomes the elastic force of the spring to make the lower movable plate 3, the cava and the four-point parallel mechanism move downward to perform the second stroke. The four-point parallel mechanism ensures the synchronization and stability of the cava during the clamping process, avoiding damage to the sucker rod due to uneven force.

[0030] See also Figure 3 An annular hoop 9 is provided below the slip, a circular through hole is opened at the center of the annular hoop 9, a chamfer is provided at the top of the circular through hole of the annular hoop 9, and the annular hoop 9 is fixedly connected to the center of the base 6.

[0031] Among them, an annular hoop 9 is provided below the slip and fixedly connected to the center of the base 6, so that the slip can move downward into the annular hoop 9, and the chamfered slope at the top of the circular through hole of the annular hoop 9 will generate a vertical inward component of force on the slip after the slip enters the annular hoop 9, so that the four-point parallel mechanism moves laterally, encounters the straightening block, moves downward, and the lower end of the slip contacts the annular hoop and stops moving, thereby improving the clamping effect on the sucker rod 13 and completing gravity self-locking. In this process, due to the small internal force of the structure, the straightening block and the structure itself will not be damaged, and the stability and reliability of the clamping are improved.

[0032] See also Figure 1-Figure 6 The upper movable plate sleeves 10 are evenly distributed on the circumference of the upper movable plate 2, and the upper movable plate sleeves 10 are fixedly connected to the upper movable plate 2; the lower movable plate sleeves 11 are evenly distributed on the circumference of the lower movable plate 3, and the lower movable plate sleeves 11 are fixedly connected to the lower movable plate 3; the upper movable plate sleeves 10 and the lower movable plate sleeves 11 are both sleeved on the support rod 8, and the bottom end of the upper movable plate sleeves 10 passes through the lower movable plate 3, and the top end of the lower movable plate sleeves 11 passes through the upper movable plate 2.

[0033] Among them, upper movable plate sleeves 10 are evenly distributed on the circumference of the upper movable plate 2, and the bottom end of the upper movable plate sleeve 10 passes through the lower movable plate 3; lower movable plate sleeves 11 are evenly distributed on the circumference of the lower movable plate 3, and the lower movable plate sleeve 11 is fixedly connected to the lower movable plate 3, and the top end of the lower movable plate sleeve 11 passes through the upper movable plate 2 so that the upper movable plate 2 and the lower movable plate 3 do not affect each other during the movement, thereby improving the stability and reliability of the device; the upper movable plate sleeve 10 and the lower movable plate sleeve 11 are both sleeved on the support rod 8, so that the upper movable plate 2 and the lower movable plate 3 can slide smoothly under the drive of the upper movable plate sleeve 10 and the lower movable plate sleeve 11; the lower movable plate sleeve 11 contacts with the top of the spring 5, so that the force of the spring 5 is more concentrated.

[0034] See also Figure 3 and Figure 4 The auxiliary support hinge point 45 on the connecting rod I405 is hinged and fixed to the bottom of the lower movable plate 3, the connecting rod II401 passes through the lower movable plate 3 and is hinged and fixed to the bottom of the upper movable plate 2, the hinge point II 44 of the connecting rod I405 is hinged and fixed to the left end of the cava frame 404, the other end of the connecting rod II401 is hinged and fixed to the inward push hinge point 42 of the triple plate 402, the main support hinge point 43 of the triple plate 402 is hinged and fixed to the lower movable plate 3, the hinge point I 41 at the lower end of the triple plate 402 is hinged and fixed to the right end of the cava frame 404, the cava frame 404 is hollow, and the rightmost end of the cava frame 404 is bolted with a cava block 403.

[0035] Among them, during the action process of the first stroke of the upper movable plate 2, when the upper movable plate 2 moves, the upper movable plate 2 moves downward, pushing the connecting rod II401, driving the triple plate 402 to rotate around the main support hinge point 43, and driving the cava frame 404 through the hinge point 1 41, and the linkage connecting rod I405 rotates around the auxiliary support hinge point 45, finally forming a synchronous closing movement of the four-point parallel mechanism, realizing the clamping and positioning of the sucker rod 13 by the cava device; when the four-point parallel mechanism moves horizontally, it encounters the straightening block, and the lateral force is small, which will not damage the structure itself, nor will it damage the straightening block; the cava block 403 fixed by the bolts at the rightmost end of the cava frame 404 is easy to replace and maintain if it is damaged during work. This modular design reduces maintenance costs and improves the durability of the device.

[0036] See also Figure 2 The pneumatic assembly includes a cylinder 7 and a cylinder fixing plate 12; the telescopic end of the cylinder 7 is fixedly connected to the cylinder fixing plate 12, and the cylinder fixing plate 12 is fixedly connected to a side of the upper movable plate 2 close to the lower movable plate 3.

[0037] Among them, the telescopic end of the cylinder 7 is fixedly connected to the cylinder fixing plate 12, and the cylinder fixing plate 12 is fixedly connected to a side of the upper movable plate 2 close to the lower movable plate 3; the cylinder 7 transmits power to the upper movable plate 2, thereby providing a power source for the entire device.

[0038] See also Figure 1-Figure 3 , the cylinder 7 is located between the support rods 8 in the support seat.

[0039] The cylinders 7 are located between the support rods 8 in the support seat, and the cylinders 7 are evenly distributed on the base 6, so that the force of the cylinders 7 on the upper movable plate 2 is evenly distributed, and the structure of the device is more compact.

[0040] See also Figure 1-Figure 7 A circular through hole with the same diameter as the circular through hole of the annular hoop 9 is opened at the center of the top plate 1, the base 6, the upper movable plate 2 and the lower movable plate 3.

[0041] Among them, circular through holes with the same diameter as the circular through hole of the annular hoop 9 are opened in the centers of the top plate 1, the base 6, the upper movable plate 2 and the lower movable plate 3 to ensure the passability of the sucker rod 13 and are suitable for sucker rods 13 of different diameters.

[0042] See also Figure 3-Figure 4 The side of the slip frame 404 above the annular hoop 9 away from the slip block 403 is provided with an inclined surface inclined toward the slip block 403, the bottom of the slip block 403 is provided with an upward inclined surface, and the surface of the slip block 403 away from the triple plate 402 is provided with an arc groove.

[0043] Among them, the side of the cava frame 404 above the annular hoop 9 away from the cava block 403 is provided with an inclined surface inclined toward the cava block 403, and the bottom of the cava block 403 is provided with an upward inclined surface, which provides the necessary conditions for the cava block 403 to smoothly enter the annular hoop 9, and the arc-shaped groove on the surface of the cava block 403 away from the triple plate 402 increases the contact area between the cava block 403 and the sucker rod 13, increases the clamping force of the sucker rod 13, and reduces the damage to the surface of the sucker rod during the clamping process.

[0044] See also Figure 5 The centers of the three groups of slips above the annular hoop 9 just coincide with the center of the annular hoop 9.

[0045] The centers of the three groups of slips above the annular hoop 9 coincide with the center of the annular hoop 9, ensuring that the sucker rod 13 is always in a straight line when being clamped and dropped, and will not be damaged.

[0046] See also Figure 7A wellhead clamping device for a sucker rod pneumatic slip comprises two sucker rod pneumatic slips, which are installed together up and down and the distance between the two sucker rod pneumatic slips is greater than or equal to the length of the straightening block on the sucker rod, and the two pneumatic slips act simultaneously.

[0047] Among them, the two sucker rod pneumatic slips are installed together up and down and the distance between the two sucker rod pneumatic slips is greater than or equal to the length of the straightening block on the sucker rod, which ensures that at least one group of slips can avoid the straightening block on the sucker rod 13. The two pneumatic slips act at the same time to ensure that there is a slip that can lock the sucker rod so that the slip can be stuck on the rod body of the sucker rod 13, preventing the clamping failure or equipment damage caused by a single slip when encountering the straightening block and the problem of a single sucker rod pneumatic slip causing the sucker rod 13 to fall into the well during operation.

[0048] During operation, firstly set two sucker rod pneumatic slips up and down, and ensure that the distance between the two sucker rod pneumatic slips is greater than the length of the sucker rod straightening block, and the two pneumatic slips act at the same time to ensure that one slip can lock the sucker rod, and then put the sucker rod into the device. Since the upper movable plate 2 is hinged and fixed to the connecting rod II401, and the lower movable connecting plate 3 is hinged and fixed to the auxiliary support hinge point 45 on the connecting rod I405, when the cylinder 7 pushes the upper movable plate 2 to move, the lower movable plate 3 is kept stationary due to the force of the spring 5, and the upper movable plate 2 moves downward, pushing the connecting rod II401, driving the triple plate 402 to rotate around the main support hinge point 43, and driving the slip frame 404 through the hinge point 141, linking the connecting rod I405 around the auxiliary support hinge point 45. Rotate to make the four-point parallel mechanism close synchronously, the cava block 403 and the sucker rod 13 fit together to complete the first stroke action, and then the cylinder 7 in the pneumatic cava of the two sucker rods continues to contract. During the contraction process, the cylinder 7 drives the upper movable plate 2 to move downward to the lower movable plate 3, and the cylinder 7 overcomes the elastic force of the spring to make the lower movable plate 3, the cava and the four-point parallel mechanism move downward to perform the second stroke action until the outer side of the cava block 403 abuts against the annular hoop 9. At this time, the second stroke action is completed and the sucker rod can be locked and fixed by its own gravity.

[0049] When the pneumatic slips are released, the above action is repeated in reverse.

[0050] The above description is only an embodiment of the present invention, and does not limit the scope of the present invention. In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached specification. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1The layout direction of the present invention is determined by the equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wellhead clamping device for a sucker rod pneumatic slip, comprising a support seat, a pneumatic assembly and a slip, characterized in that: The support seat comprises a support rod (8), a top plate (1) and a base (6), wherein a connecting hole is provided in the middle of the support seat; a slip is provided in the support seat along the circumference with the connecting hole as the center, at least two support rods (8) are fixed to the inner circumference of the support seat staggered with the slips, springs (5) are sleeved on the separated support rods (8), and a lower movable plate (3) is sleeved on the support rod (8) at the upper end of the spring (5); an upper movable plate (2) is installed in the support seat above the lower movable plate (3), and a cylinder (7) is installed in the support seat, and the power output end of the cylinder (7) is connected to the upper movable plate (2) and drives the upper movable plate (2) to move up and down; the slip comprises a slip end and a slip handle; the slip handle is horizontally fixed to the outer side of the upper end of the slip end; a hinge point (41) is provided at the inner end of the slip handle, and a triple plate (40) is hingedly connected to the hinge point (41) 2), the other end of the triple plate (402) is respectively provided with a main support hinge point (43) and an inner push hinge point (42), the inner push hinge point (42) is located below the outer side of the main support hinge point (43); the main support hinge point (43) is installed on the hinge seat on the inner side of the bottom of the lower movable plate (3) through a pin shaft; the inner push hinge point and the upper movable plate (2) are hinged by a connecting rod II (401); a hinge point II (44) is provided at the outer end of the cava handle, a connecting rod I (405) is hinged on the hinge point II (44), and an auxiliary support hinge point (45) is provided at the other end of the connecting rod I (405), and the auxiliary support hinge point (45) is installed on the hinge seat on the outer side of the bottom of the lower movable plate (3) through a pin shaft; a four-point parallel mechanism is formed between the hinge point I (41), the main support hinge point (43), the hinge point II (44) and the auxiliary support hinge point (45).

2. The wellhead clamping device of the sucker rod pneumatic slip according to claim 1, characterized in that: An annular hoop (9) is provided below the slip, a circular through hole is provided at the center of the annular hoop (9), a chamfer is provided at the top end of the circular through hole of the annular hoop (9), and the annular hoop (9) is fixedly connected to the center of the base (6).

3. The wellhead clamping device of the sucker rod pneumatic slip according to claim 2, characterized in that: The upper movable plate (2) is evenly distributed with upper movable plate sleeves (10) on its upper circumference, and the upper movable plate sleeves (10) are fixedly connected to the upper movable plate (2); the lower movable plate sleeves (11) are evenly distributed with lower movable plate sleeves (11) on its upper circumference, and the lower movable plate sleeves (11) are fixedly connected to the lower movable plate (3); the upper movable plate sleeves (10) and the lower movable plate sleeves (11) are both sleeved on the support rod (8), and the bottom end of the upper movable plate sleeves (10) passes through the lower movable plate (3), and the top end of the lower movable plate sleeves (11) passes through the upper movable plate (2).

4. The wellhead clamping device of the sucker rod pneumatic slip according to claim 3 is characterized in that: The auxiliary support hinge point (45) on the connecting rod I (405) is hinged and fixed to the bottom of the lower movable plate (3), the connecting rod II (401) passes through the lower movable plate (3) and is hinged and fixed to the bottom of the upper movable plate (2), the hinge point II (44) of the connecting rod I (405) is hinged and fixed to the left end of the slip frame (404), the other end of the connecting rod II (401) is hinged and fixed to the inner push hinge point (42) of the triple-jointed plate (402), the main support hinge point (43) of the triple-jointed plate (402) is hinged and fixed to the lower movable plate (3), the hinge point I (41) at the lower end of the triple-jointed plate (402) is hinged and fixed to the right end of the slip frame (404), the slip frame (404) is hollow, and a slip block (403) is bolted to the rightmost end of the slip frame (404).

5. The wellhead clamping device of the sucker rod pneumatic slip according to claim 4, characterized in that: The pneumatic assembly comprises a cylinder (7) and a cylinder fixing plate (12); the telescopic end of the cylinder (7) is fixedly connected to the cylinder fixing plate (12), and the cylinder fixing plate (12) is fixedly connected to a surface of the upper movable plate (2) close to the lower movable plate (3).

6. The wellhead clamping device of the sucker rod pneumatic slip according to claim 5, characterized in that: The cylinder (7) is located between the support rods (8) in the support seat.

7. The wellhead clamping device of the sucker rod pneumatic slip according to claim 6, characterized in that: A circular through hole having the same diameter as the circular through hole of the annular hoop (9) is provided at the center of the top plate (1), the base (6), the upper movable plate (2) and the lower movable plate (3).

8. The wellhead clamping device of the sucker rod pneumatic slip according to claim 7, characterized in that: A side of the slip frame (404) above the annular hoop (9) away from the slip block (403) is provided with an inclined surface inclined toward the slip block (403), a bottom of the slip block (403) is provided with an inclined surface inclined upward, and a surface of the slip block (403) away from the triple plate (402) is provided with an arc-shaped groove.

9. The wellhead clamping device of the sucker rod pneumatic slip according to claim 8, characterized in that: The centers of the three groups of slips above the annular hoop (9) coincide with the center of the annular hoop (9).

10. A wellhead clamping device using the sucker rod pneumatic slips as claimed in any one of claims 1 to 9, characterized in that: The utility model comprises two sucker rod pneumatic slips, which are installed together up and down, and the distance between the two sucker rod pneumatic slips is greater than or equal to the length of the straightening block on the sucker rod.

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