A double hydraulic hydraulic anchor resistant to jamming

Abstract

The present invention relates to the technical field of hydraulic anchors, and discloses an anti-sticking double-hydraulic hydraulic anchor, which can prevent liquid from entering the anchor claw holes, improve the reliability of the hydraulic anchor, and reduce the failure risk caused by sand jamming and scale; it includes an anchor body, with an upper connector and a lower connector connected to both ends of the anchor body. A first hydraulic channel is formed in the middle of the anchor body, and multiple groups of second hydraulic channels are formed on the side of the anchor body. Each second hydraulic channel has a liquid inlet end and a liquid outlet end, and a set of anchor claw holes is provided above each group of second hydraulic channels, and a set of anchor claw structures is installed at the position of each group of anchor claw holes; the anchor claw structure includes an anchor claw part, the anchor claw part is arranged in the anchor claw hole, a shell sleeve is arranged inside the anchor claw part, and the shell sleeve is hermetically covered on the inner side of the anchor claw hole; and a pressure-receiving part connected to the anchor claw part is arranged on the shell sleeve; and a sealing part communicated with the liquid outlet end of the second hydraulic channel is installed at the connection between the shell sleeve and the anchor body, so that after the second hydraulic channel enters the liquid, the sealing part expands and seals the connection between the shell sleeve and the anchor body.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic anchors, and more particularly, to an anti-sticking double-hydraulic hydraulic anchor. Background Art

[0002] A hydraulic anchor is a downhole tool commonly used for fixing pipe strings in high-pressure operations such as downhole fracturing and acidizing in oil fields. The hydraulic anchor is connected to the operation pipe string, and high-pressure liquid is injected into the tubing. Under the action of pressure, the anchor claws provided on the hydraulic anchor move outward and anchor to the casing, playing a role in fixing the operation pipe string. The hydraulic anchor plays a key role in processes such as stratified fracturing, stratified acidizing, and stratified water injection, which is related to the success or failure of the construction.

[0003] In the prior art, hydraulic anchors are divided into two types. The first is a hydraulic anchor without a filtering structure, where the anchor claw structure is in direct contact with the liquid. The second is a hydraulic anchor with a lined slotted pipe structure, where the liquid contacts the anchor claw structure after being filtered through the slotted pipe. The problem with both of these structures is that since the liquid inevitably contacts part of the anchor claw structure, it will cause sand jamming and scale formation, resulting in the failure of the hydraulic anchor. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the above background art, and then a double-hydraulic anti-sticking hydraulic anchor is proposed.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A double-hydraulic anti-sticking hydraulic anchor includes an anchor body, with an upper connector and a lower connector connected to both ends of the anchor body. A first hydraulic channel is formed in the middle of the anchor body, and multiple groups of second hydraulic channels are formed on the side of the anchor body. The second hydraulic channels have a liquid inlet end and a liquid outlet end, and a set of anchor claw holes is provided above each group of second hydraulic channels, and a set of anchor claw structures is installed at each position of the anchor claw holes. Among them, the anchor claw structure includes an anchor claw part, which is arranged in the anchor claw hole. A shell sleeve is provided inside the anchor claw part, and the shell sleeve is hermetically covered inside the anchor claw hole to separate the anchor claw hole from the liquid. And a pressure-receiving part connected to the anchor claw part is provided on the shell sleeve, so that the pressure-receiving part is pushed by the liquid pressure to move the anchor claw part outward. And a sealing part communicating with the liquid outlet end of the second hydraulic channel is installed at the connection between the shell sleeve and the anchor body, so that after the liquid enters the second hydraulic channel, the sealing part expands and seals the connection between the shell sleeve and the anchor body, preventing the liquid from seeping into the connection between the shell sleeve and the anchor body.

[0007] Further, in the above solution, the anchor claw hole includes an inner hole, which is arranged inside the anchor body and sequentially communicates with a middle hole and an outer hole from the inside to the outside. Among them, the size of the middle hole is smaller than the size of the inner hole and the outer hole, so that the anchor claw hole forms an I-shaped structure.

[0008] Furthermore, in the above solution, the anchor claw part includes a piston which is arranged in the inner hole. A plurality of groups of first springs are circumferentially arranged between the piston and the outer wall of the inner hole. A push rod is connected to the outside of the piston. The push rod passes through the middle hole and is connected to a claw head arranged in the outer hole, so that the piston moves outward under pressure.

[0009] Furthermore, in the above solution, the anchor claw part further includes a sealing sleeve which is arranged in the middle hole and accesses the push rod. The inner diameter of the sealing sleeve matches the outer diameter of the push rod, so that the sealing sleeve tightly fits the outer wall of the push rod, and can prevent the liquid outside the claw head from leaking through the gap between the push rod and the middle hole.

[0010] Furthermore, in the above solution, the pressure-receiving part includes a guide sleeve which is horizontally and fixedly arranged on the shell sleeve. A pressure rod is slidably arranged in the guide sleeve. One end of the pressure rod extends out of the guide sleeve and is connected to a pressure-receiving plate. A telescopic sleeve is arranged between the pressure-receiving plate and the shell sleeve to cover the guide sleeve and the pressure rod, separating the guide sleeve and the pressure rod from the liquid. The other end of the pressure rod extends out of the guide sleeve and is connected to a pressure seat which is connected to the piston.

[0011] Furthermore, in the above solution, the guide sleeve is connected to the shell sleeve by welding or integrally formed therewith to improve the sealing performance between the two.

[0012] Furthermore, in the above solution, the pressure-receiving part further includes a second spring which is arranged between the pressure-receiving plate and the shell sleeve and is inside the telescopic sleeve.

[0013] Furthermore, in the above solution, the pressure-receiving part further includes a tension membrane which is fixedly covered on the inner side of the anchor claw hole and is between the pressure seat and the piston, so as to prevent the liquid from leaking from the gap between the pressure seat and the piston into the anchor claw hole. At the same time, the tension membrane can adapt to the change of the relative position between the pressure seat and the piston and always maintain the sealing effect on the gap during the pressure transmission process.

[0014] Furthermore, in the above solution, the sealing part includes a docking cover which hermetically covers the liquid outlet end of the second hydraulic channel. The docking cover is communicated with a drainage pipe. The top end of the drainage pipe is communicated with a liquid bladder which is arranged at the connection between the shell sleeve and the anchor body and wraps the shell sleeve.

[0015] Furthermore, in the above solution, an air flow channel is provided on the anchor body. The air flow channel connects each inner hole. The end of the air flow channel extends outside the upper connector and is connected to a ventilation pipe. A valve is installed on the ventilation pipe. When gas is injected into the inner hole through the ventilation pipe and the air flow channel, an elastic pressure cavity is formed inside the inner hole.

[0016] Furthermore, in the above solution, the second hydraulic channel is composed of a plurality of slits to achieve the filtration of the liquid.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Through the design of the first hydraulic channel and the second hydraulic channel, the present invention divides the liquid into two paths, and in combination with the use of the anchor claw structure, it can prevent the liquid from entering the anchor claw hole. The liquid entering the first hydraulic channel is blocked by the housing sleeve and cannot enter the anchor claw hole, separating the anchor claw hole from the liquid, playing a role in protecting the anchor claw part, preventing it from directly contacting the liquid and causing problems such as sand jamming and scale, improving the reliability and service life of the hydraulic anchor, and reducing the failure risk caused by sand jamming and scale. After the liquid enters the second hydraulic channel, the sealing part expands to seal the connection between the housing sleeve and the anchor body, further preventing the liquid from seeping in from the connection, ensuring the isolation effect between the anchor claw part and the liquid, and ensuring that the hydraulic anchor can also work stably in high-pressure and complex downhole environments.

[0019] 2. Through the coordinated setting of the air flow channel, the ventilation pipe and the valve, the present invention can form an elastic pressure chamber. This design provides a reliable backup power source for the telescopic movement of the claw head, effectively compensating for the possible problems of the first spring, improving the stability and reliability of the entire device, ensuring that the claw head can normally perform telescopic movements in complex working environments, guaranteeing the normal operation of the equipment, and having a novel and ingenious structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is Figure 1 the partial enlarged schematic diagram of A in

[0022] Figure 3 is the installation position schematic diagram of the ventilation pipe;

[0023] Figure 4 is Figure 3 the partial enlarged schematic diagram of B in

[0024] Wherein: 1. Anchor body; 11. First hydraulic channel; 12. Second hydraulic channel; 13. Anchor claw hole; 131. Inner hole; 132. Middle hole; 133. Outer hole; 14. Air flow channel; 2. Upper connector; 3. Lower connector; 4. Anchor claw structure; 41. Anchor claw part; 411. Piston; 412. First spring; 413. Push rod; 414. Claw head; 415. Sealing sleeve; 42. Housing sleeve; 43. Compressed part; 431. Guide sleeve; 432. Pressure rod; 433. Pressure receiving plate; 434. Telescopic sleeve; 435. Pressure seat; 436. Second spring; 437. Tension film; 44. Sealing part; 441. Docking cover; 442. Drainage pipe; 443. Liquid sac; 5. Ventilation pipe; 51. Valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The present invention will be further described in conjunction with the drawings and embodiments:

[0026] An anti-jamming double hydraulic anchor, referring to the attached Figure 1 As shown, it includes an anchor body 1. The two ends of the anchor body 1 are connected with an upper connector 2 and a lower connector 3. A first hydraulic channel 11 is formed in the middle of the anchor body 1, and multiple groups of second hydraulic channels 12 are formed on the side of the anchor body 1. The second hydraulic channels 12 are composed of multiple slits to realize the filtration of liquid. The second hydraulic channels 12 have a liquid inlet end and a liquid outlet end, and a set of anchor claw holes 13 are provided above each group of second hydraulic channels 12, and a set of anchor claw structures 4 are installed at the positions of each group of anchor claw holes 13; wherein, the anchor claw structure 4 includes an anchor claw part 41, the anchor claw part 41 is arranged in the anchor claw hole 13, a housing sleeve 42 is arranged inside the anchor claw part 41, and the housing sleeve 42 is hermetically covered inside the anchor claw hole 13 to separate the anchor claw hole 13 from the liquid; and a pressure-receiving part 43 connected to the anchor claw part 41 is arranged on the housing sleeve 42, so that the pressure-receiving part 43 is pushed by the liquid pressure to move the anchor claw part 41 outwards; and a sealing part 44 communicated with the liquid outlet end of the second hydraulic channel 12 is installed at the connection between the housing sleeve 42 and the anchor body 1, so that after the liquid enters the second hydraulic channel 12, the sealing part 44 expands and seals the connection between the housing sleeve 42 and the anchor body 1, preventing the liquid from seeping into the connection between the housing sleeve 42 and the anchor body 1.

[0027] In the specific implementation process of the present invention, an external hydraulic system conveys liquid to the first hydraulic channel 11 in the middle of the anchor body 1 and the second hydraulic channels 12 on the side; the liquid entering the first hydraulic channel 11 cannot enter the anchor claw hole 13 due to the blockage of the housing sleeve 42, separating the anchor claw hole 13 from the liquid, playing a role in protecting the anchor claw part 41 and preventing problems such as sand jamming and water scale from occurring due to direct contact with the liquid; and the pressure-receiving part 43 arranged on the housing sleeve 42 is the part directly in contact with the liquid in the first hydraulic channel 11. When the pressure-receiving part 43 is pushed by the liquid pressure in the first hydraulic channel 11, it will cause the connected anchor claw part 41 to move outwards, extend out of the anchor claw hole 13, and then tightly grasp the well wall to realize the anchoring function; when the liquid enters the second hydraulic channel 12, the sealing part 44 will expand, thereby sealing the connection between the housing sleeve 42 and the anchor body 1, further preventing the liquid from seeping in from the connection, and ensuring the isolation effect between the anchor claw part 41 and the liquid.

[0028] For the above solution, referring to the attached Figure 2As shown, the anchor claw hole 13 includes an inner hole 131. The inner hole 131 is arranged inside the anchor body 1 and is sequentially connected with a middle hole 132 and an outer hole 133 from inside to outside. Among them, the size of the middle hole 132 is smaller than the size of the inner hole 131 and the outer hole 133, so that the anchor claw hole 13 forms an I-shaped structure. In the solution, the anchor claw hole 13 is designed in an I-shape, with a larger inner hole 131, a smaller middle hole 132, and a larger outer hole 133 from inside to outside. This unique structure can play a role in positioning and guiding the anchor claw part 41. The limitation of the size of the middle hole 132 makes the anchor claw part 41 stable during movement and will not have problems such as radial deviation or anchor detachment, ensuring that the anchor claw part 41 can accurately extend and retract.

[0029] For the above solution, refer to the attached Figure 2 As shown, the anchor claw part 41 includes a piston 411. The piston 411 is arranged in the inner hole 131, and a plurality of groups of first springs 412 are circumferentially arranged between the piston 411 and the outer wall of the inner hole 131. A push rod 413 is connected to the outside of the piston 411. The push rod 413 passes through the middle hole 132 and is connected to a claw head 414 arranged in the outer hole 133, so that the piston 411 moves outward under pressure.

[0030] In the solution, the piston 411 is located in the inner hole 131. Multiple groups of first springs 412 in the circumferential direction provide an inward restoring force for the piston 411. When the pressure-receiving part 43 on the housing sleeve 42 is subjected to liquid pressure, the pressure is transmitted to the piston 411, overcoming the elastic force of the first spring 412 and pushing the piston 411 to move outward. The outward movement of the piston 411 drives the push rod 413 connected thereto. Since the push rod 413 passes through the middle hole 132 and is connected to the claw head 414 in the outer hole 133, the push rod 413 transmits the movement of the piston 411 to the claw head 414, causing the claw head 414 to extend out of the outer hole 133 to achieve the anchoring action. When the liquid pressure disappears, the elastic force of the first spring 412 resets the piston 411 and the claw head 414 retracts; and the limit design of the inner hole 131 for the piston 411 and the outer hole 133 for the claw head 414 effectively avoids damage such as collision and detachment of the components caused by excessive movement (the piston 411 moves outward under the push of the liquid pressure, but the structure of the inner hole 131 limits the excessive outward movement of the piston 411, preventing the piston 411 from disconnecting from the effective connection with the push rod 413 or causing structural damage due to excessive displacement, ensuring the coordinated operation of the piston 411 and other components within a safe and controllable range; the outer hole 133 also restricts the movement of the claw head 414 with its own structure. The claw head 414 extends outward driven by the push rod 413, and the outer hole 133 limits the excessive inward retraction of the claw head 414. When the claw head 414 retracts inward under the action of the first spring 412 to the limit position set by the outer hole 133, the inner side of the claw head 414 abuts against the wall of the outer hole 133, avoiding the excessive retraction of the claw head 414 and unable to play the anchoring role normally, ensuring that the claw head 414 can be in a position range where it can work normally under any working conditions).

[0031] In addition, referring to the attached Figure 2 As shown, the anchor claw part 41 further includes a sealing sleeve 415. The sealing sleeve 415 is arranged in the middle hole 132 and is connected to the push rod 413. The inner diameter of the sealing sleeve 415 matches the outer diameter of the push rod 413, so that the sealing sleeve 415 tightly fits against the outer wall of the push rod 413, and can prevent the liquid outside the claw head 414 from leaking through the gap between the push rod 413 and the middle hole 132.

[0032] In the above solution, the pressure-receiving part 43 includes a guide sleeve 431. The guide sleeve 431 is horizontally and fixedly arranged on the housing sleeve 42. To improve the sealing performance between the two, the guide sleeve 431 is welded to the housing sleeve 42 or the two are integrally formed. And a pressure rod 432 is slidably arranged in the guide sleeve 431. One end of the pressure rod 432 extends out of the guide sleeve 431 and is connected with a pressure-receiving plate 433. A telescopic sleeve 434 is arranged between the pressure-receiving plate 433 and the housing sleeve 42 to cover the guide sleeve 431 and the pressure rod 432, separating the guide sleeve 431 and the pressure rod 432 from the liquid. The other end of the pressure rod 432 extends out of the guide sleeve 431 and is connected with a pressure seat 435 that is connected to the piston 411;

[0033] In the solution, when the liquid pressure acts on the pressure-receiving plate 433, the pressure-receiving plate 433 drives the pressure rod 432 to slide within the guide sleeve 431 under the force, thereby transmitting the pressure to the pressure seat 435 connected to the piston 411, and finally pushing the piston 411 to move, realizing the extension action of the anchor claw part 41. The telescopic sleeve 434 is arranged between the pressure-receiving plate 433 and the housing sleeve 42, covering the guide sleeve 431 and the pressure rod 432. It can change accordingly with the expansion and contraction of the pressure rod 432. While ensuring the normal movement of the pressure rod 432, it completely separates the guide sleeve 431 and the pressure rod 432 from the liquid, preventing the liquid from seeping into the internal structure and ensuring the normal working environment of the pressure transmission components;

[0034] Among them, the pressure-receiving part 43 further includes a second spring 436. The second spring 436 is arranged between the pressure-receiving plate 433 and the housing sleeve 42 and is inside the telescopic sleeve 434. When the pressure-receiving plate 433 is impacted by an external force, the second spring 436 can absorb and buffer part of the impact force, reducing the damage to the entire pressure-receiving part 43 and related components. By buffering the impact force and adjusting the pressure, the second spring 436 helps to reduce the pressure and stress borne by the sealing structures (such as the seal between the guide sleeve 431 and the housing sleeve 42, the seal of the telescopic sleeve 434, etc.), reducing the risk of damage or leakage of the sealing part 44 components due to excessive force, and further improving the sealing performance and overall reliability of the pressure-receiving part 43. After the external force disappears, the second spring 436 uses its elastic potential energy to precisely push the pressure-receiving plate 433 back to its original position, ensuring the consistency and accuracy of each action of the device;

[0035] In addition, from the perspective of sealing performance, referring to the attached Figure 2 As shown, the pressure-receiving part 43 further includes a tension film 437. The tension film 437 is fixedly covered inside the anchor claw hole 13 and is between the pressure seat 435 and the piston 411. When the pressure seat 435 moves towards the piston 411 under the push of the pressure rod 432, the tension film 437 will be stretched under a certain tension force. Since it is between the pressure seat 435 and the piston 411, it can form a tight isolation layer to prevent the liquid from leaking from the gap between the pressure seat 435 and the piston 411 into the anchor claw hole 13. At the same time, the tension film 437 can adapt to the change in the relative position between the pressure seat 435 and the piston 411 and always maintain the sealing effect on the gap during the pressure transmission process.

[0036] Regarding the above solution, referring to the attached Figure 2 As shown, the sealing part 44 includes a docking cover 441. The docking cover 441 is hermetically covered on the liquid outlet end of the second hydraulic channel 12, and the docking cover 441 is connected to a drainage pipe 442. The top of the drainage pipe 442 is connected to a liquid bag 443. The liquid bag 443 is arranged at the connection between the housing sleeve 42 and the anchor body 1 and wraps the housing sleeve 42;

[0037] In the solution, when there is liquid flowing out of the second hydraulic channel 12, the liquid enters the liquid sac 443 through the docking cover 441 and the drainage tube 442, causing the liquid sac 443 to expand. The expanded liquid sac 443 will tightly adhere to the connection between the housing sleeve 42 and the anchor body 1, forming a sealed space to prevent external liquid from entering the connection between the housing sleeve 42 and the anchor body 1, playing a role of sealing and isolation. In addition, the liquid sac 443 wraps the housing sleeve 42, which not only protects the housing sleeve 42 from being eroded by the external environment, but also further enhances the sealing performance of the entire sealing part 44. Even if there are tiny gaps or unevenness on the surface of the housing sleeve 42, the liquid sac 443 can fill them through its own elastic deformation to ensure the sealing effect.

[0038] In the above solution, considering that the first spring 412 may have problems during long-term use, which will affect the telescopic movement of the claw head 414. Therefore, referring to the attached Figure 3 and the attached Figure 4 As shown, an air flow channel 14 is provided on the anchor body 1. The air flow channel 14 connects each inner hole 131, and the end of the air flow channel 14 extends outside the upper connector 2 and is connected with a ventilation pipe 5. A valve 51 is installed on the ventilation pipe 5. When gas is injected into the inner hole 131 through the ventilation pipe 5 and the air flow channel 14, an elastic pressure chamber is formed inside the inner hole 131 (gas has compressibility);

[0039] In the solution, when an external force acts, the thrust of the piston 411 is greater than the pressure in the pressure chamber. At this time, the piston 411 moves outward, causing the claw head 414 to extend. When the external force disappears, the gas previously compressed in the pressure chamber begins to expand. The gas expansion will generate an outward pressure, which acts on the piston 411 and pushes the piston 411 back to the initial position, thus enabling the piston 411 to return to its original position. In the telescopic movement of the claw head 414, when the first spring 412 has problems and cannot work properly, the pressure chamber can replace the first spring 412 to play a role. This elastic pressure chamber formed based on gas pressure provides a reliable backup power source for the telescopic movement of the claw head 414, effectively making up for the possible problems of the first spring 412, improving the stability and reliability of the entire device, ensuring that the claw head 414 can normally perform telescopic movement in a complex working environment, and guaranteeing the normal operation of the equipment.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A double - hydraulic anti - jamming hydraulic anchor, comprising an anchor body (1), with an upper connector (2) and a lower connector (3) connected to both ends of the anchor body (1). A first hydraulic channel (11) is formed in the middle of the anchor body (1). It is characterized in that: Multiple groups of second hydraulic channels (12) are formed on the side of the anchor body (1). The second hydraulic channels (12) have a liquid inlet end and a liquid outlet end. And above each group of second hydraulic channels (12), there is a set of anchor claw holes (13), and a set of anchor claw structures (4) are installed at the position of each group of anchor claw holes (13); Among them, the anchor claw structure (4) includes an anchor claw part (41). The anchor claw part (41) is arranged in the anchor claw hole (13). Inside the anchor claw part (41), there is a shell sleeve (42). The shell sleeve (42) is hermetically covered on the inner side of the anchor claw hole (13) to separate the anchor claw hole (13) from the liquid. And on the shell sleeve (42), there is a pressure - receiving part (43) connected to the anchor claw part (41), so that after the pressure - receiving part (43) is subjected to liquid pressure, it pushes the anchor claw part (41) to move outwards. And at the connection between the shell sleeve (42) and the anchor body (1), there is a sealing part (44) connected to the liquid outlet end of the second hydraulic channel (12), so that after the second hydraulic channel (12) enters the liquid, the sealing part (44) expands and seals the connection between the shell sleeve (42) and the anchor body (1).

2. The double - hydraulic anti - jamming hydraulic anchor according to claim 1, characterized in that: The anchor claw hole (13) includes an inner hole (131). The inner hole (131) is arranged inside the anchor body (1) and is sequentially connected with a middle hole (132) and an outer hole (133) from the inside outwards; Among them, the size of the middle hole (132) is smaller than the size of the inner hole (131) and the outer hole (133), so that the anchor claw hole (13) forms an I - shaped structure.

3. The double - hydraulic anti - jamming hydraulic anchor according to claim 2, characterized in that: The anchor claw part (41) includes a piston (411). The piston (411) is arranged in the inner hole (131). And multiple groups of first springs (412) are arranged circumferentially between the piston (411) and the outer wall of the inner hole (131). And on the outside of the piston (411), there is a push rod (413) connected. The push rod (413) passes through the middle hole (132) and is connected to a claw head (414) arranged in the outer hole (133), so that the piston (411) moves outwards under pressure.

4. The double - hydraulic anti - jamming hydraulic anchor according to claim 3, characterized in that: The anchor claw part (41) further includes a sealing sleeve (415). The sealing sleeve (415) is arranged in the middle hole (132) and accesses the push rod (413). The inner diameter of the sealing sleeve (415) matches the outer diameter of the push rod (413), so that the sealing sleeve (415) tightly fits the outer wall of the push rod (413).

5. The double - hydraulic anti - jamming hydraulic anchor according to claim 4, characterized in that: The pressure-receiving part (43) includes a guide sleeve (431). The guide sleeve (431) is horizontally and fixedly arranged on the housing sleeve (42). A pressure rod (432) is slidably arranged in the guide sleeve (431). One end of the pressure rod (432) extends out of the guide sleeve (431) and is connected with a pressure-receiving plate (433). An expansion sleeve (434) is arranged between the pressure-receiving plate (433) and the housing sleeve (42) to cover the guide sleeve (431) and the pressure rod (432), separating the guide sleeve (431) and the pressure rod (432) from the liquid. The other end of the pressure rod (432) extends out of the guide sleeve (431) and is connected with a pressure seat (435) that is in contact with the piston (411).

6. The anti-jamming double hydraulic hydraulic anchor according to claim 5, characterized in that: The pressure-receiving part (43) further includes a second spring (436). The second spring (436) is arranged between the pressure-receiving plate (433) and the housing sleeve (42) and is inside the expansion sleeve (434).

7. The anti-jamming double hydraulic hydraulic anchor according to claim 6, characterized in that: The pressure-receiving part (43) further includes a tension film (437). The tension film (437) is fixedly covered on the inner side of the anchor claw hole (13) and is between the pressure seat (435) and the piston (411).

8. The anti-jamming double hydraulic hydraulic anchor according to claim 7, characterized in that: The sealing part (44) includes a butt joint cover (441). The butt joint cover (441) is hermetically covered on the liquid outlet end of the second hydraulic channel (12). The butt joint cover (441) is communicated with a drainage pipe (442). The top end of the drainage pipe (442) is communicated with a liquid sac (443). The liquid sac (443) is arranged at the joint of the housing sleeve (42) and the anchor body (1) and wraps the housing sleeve (42).

9. The anti-jamming double hydraulic hydraulic anchor according to claim 8, characterized in that: The anchor body (1) is provided with an air flow channel (14). The air flow channel (14) communicates each inner hole (131). The end of the air flow channel (14) extends outside the upper connector (2) and is connected with a ventilation pipe (5). A valve (51) is installed on the ventilation pipe (5). When gas is injected into the inner hole (131) through the ventilation pipe (5) and the air flow channel (14), an elastic pressure chamber is formed inside the inner hole (131).

10. The anti-jamming double hydraulic hydraulic anchor according to any one of claims 1-9, characterized in that: The second hydraulic channel (12) is composed of multiple slits.

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