A large-diameter drilling pressure relief device

Abstract

This invention discloses a large-diameter drilling pressure relief device, comprising: a vehicle body, a drilling unit, a feed component, a protective cover, and a collection component; a work platform is provided on the vehicle body; the drilling unit is slidably mounted on the work platform; the feed component is disposed within the work platform and connected to the drilling unit; the protective cover is slidably mounted on the work platform and covers the drilling unit, with its contact surface contacting the wall surface before the drilling unit; the collection component is disposed on the work platform and connected to the protective cover. This invention, by having the protective cover contact the wall surface first to form a relatively enclosed drilling space, allows debris to be intercepted and collected by the protective cover during subsequent drill rod operations, thereby reducing debris splashing and ensuring the safety of workers. Simultaneously, the collection component discharges debris from within the protective cover to ensure the normal operation of the drilling unit.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to a large-diameter drilling pressure relief device. Background Technology

[0002] The core function of large-diameter borehole pressure relief equipment is to change or destroy the original stress state of the rock or coal mass by drilling large-diameter holes in the rock or coal mass, thereby reducing local stress concentration and releasing accumulated energy, so as to prevent or control sudden dynamic disasters such as rock bursts and rock bursts. It is commonly used in technical fields such as mining engineering, tunnels and underground engineering.

[0003] Drilling and decompression equipment generates a large amount of debris during operation, and the flying debris can significantly affect the personal safety of workers. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a large-diameter drilling pressure relief device that reduces debris splashing.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a large-diameter drilling and pressure relief device, comprising: a vehicle body, a drilling unit, a feeding component, a protective cover, and a collecting component; The vehicle body is equipped with a work platform; The drilling unit is slidably mounted on the worktable; The feed component is disposed inside the worktable and connected to the drilling unit, and is used to drive the drilling unit to move along the length direction of the worktable. The protective cover is installed on the workbench and covers the drilling unit. Its contact surface contacts the wall surface before the drilling unit, in order to prevent debris from splashing and to collect it. The collecting component is mounted on the workbench and connected to the protective cover, and is used to discharge debris from inside the protective cover.

[0006] Furthermore, a chamber is provided inside the workbench; The collection component includes a screw conveyor, a belt drive component, and a collection bin; The collection bin is located on the workbench and connected to the chamber for storing debris; The screw conveyor is rotatably inserted into the cavity, with one end connected to the opening of the protective cover for conveying debris into the collection bin. The belt drive component is disposed between the screw conveyor and the feed component, so that the feed component drives the screw conveyor to rotate.

[0007] Furthermore, the feeding component includes a screw rotatably inserted into the worktable, a power unit, and a coupling unit; The screw is threadedly connected to the drilling unit and is used to drive the drill rod to move closer to or away from the wall surface. The power unit is mounted on the workbench, and one end of the belt transmission component is connected to the moving end of the power unit. The power unit is used to drive the screw to rotate while simultaneously driving the screw conveyor to rotate. The coupling unit is disposed between the power unit and the screw, and is used to protect the power unit.

[0008] Furthermore, the protective cover is slidably mounted on the workbench, and the workbench is also provided with a positioning cover, which is fitted onto the protective cover; The screw conveyor is telescopically mounted within the cavity to avoid interfering with the movement of the protective cover; The rear of the vehicle body is also equipped with a telescopic support rod, and a torsion spring is provided at its rotatable connection. The torsion spring is used to apply a downward rotational torque to the support rod. A transmission component is also provided between the protective cover and the positioning cover. The movable end of the transmission component is connected to the protective cover, and the other end is connected to the support rod. During the movement of the protective cover, the transmission component drives the telescopic end of the support rod to extend and contact the ground.

[0009] Furthermore, the transmission component consists of a push rod mounted on the protective cover, an oil delivery tank mounted on the positioning cover, a hydraulic plate, and an oil delivery pipe; The oil tank has a first oil chamber inside, which stores a pressure transmission medium. The hydraulic plate is slidably disposed in the first oil chamber; One end of the push rod is inserted into the first oil chamber and connected to the hydraulic plate, and is used to drive the hydraulic plate to move along the length of the oil tank. One end of the oil pipeline is connected to the first oil chamber, and the other end is connected to the support rod, for conveying the pressure transmission medium into the support rod.

[0010] Furthermore, a second oil chamber is provided inside the oil tank, and a flow channel is provided between the two chambers to communicate with each other. The oil pipeline is provided with an oil inlet that communicates with each oil chamber respectively. The oil tank is equipped with an oil return component, which includes a sealing block, a telescopic rod, a check valve, and a pressure valve. The sealing block is vertically and vertically disposed in the first oil chamber and corresponds to the hydraulic plate and the push rod respectively, so as to open and close the flow channel; Both the hydraulic plate and the push rod can contact the sealing block and apply a vertically upward thrust to it; The telescopic rod is telescopically mounted inside the flow channel and connected to the sealing block; The pressure valve is mounted on the positioning cover and located at the connection between the oil pipeline and the second oil chamber, and is used to control the pressure transmission medium to enter the second oil chamber. The one-way valve is located at the flow channel connection of the second oil chamber, allowing the pressure transmission medium to flow unidirectionally into the first oil chamber. Furthermore, the contact surface of the protective cover is also provided with a bonding plate to increase the contact area between the protective cover and the wall surface.

[0011] The beneficial effects of this invention are as follows: by first contacting the protective cover with the wall to form a relatively closed drilling space, during the subsequent drilling operation, the debris is intercepted and collected by the protective cover, thereby reducing debris splashing and ensuring the personal safety of the workers. At the same time, the collecting component discharges the debris inside the protective cover to ensure the normal operation of the drilling unit. Attached Figure Description

[0012] Figure 1 This is a perspective view of a large-diameter drilling pressure relief device according to the present invention; Figure 2 This is a cross-sectional view of a large-diameter drilling pressure relief device according to the present invention; Figure 3 for Figure 2 Enlarged view at point A in the middle; Figure 4 This is a structural view of the screw conveyor; Figure 5 This is a structural view of the oil return component.

[0013] In the picture: 1. Vehicle body; 11. Workbench; 111. Chamber; 2. Drilling unit; 3. Feeding component; 31. Screw; 32. Power unit; 33. Coupling unit; 4. Protective cover; 41. First elastic unit; 42. Adhesive plate; 5. Collection component; 51. Collection bin; 52. Screw conveyor; 521. Conveying section; 522. Connecting section; 53. Belt drive component; 531. Drive wheel; 532. Drive belt; 6. Positioning cover; 7. Support rod; 71. Second elastic unit; 8. Transmission component; 81. Push rod; 82. Oil tank; 821. First oil chamber; 822. Second oil chamber; 83. Hydraulic plate; 84. Oil pipe; 9. Return oil component; 91. Sealing block; 92. Telescopic rod; 93. Third elastic unit; 94. Pressure valve; 95. Check valve. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1-5 The present invention discloses a large-diameter drilling and pressure relief device, comprising: a vehicle body 1, a drilling unit 2, a feeding component 3, a protective cover 4, and a collecting component 5; The vehicle body 1 is equipped with a work platform 11; The drilling unit 2 is slidably mounted on the workbench 11 for drilling operations; The feed component 3 is installed inside the worktable 11 and connected to the drilling unit 2, and is used to drive the drilling unit 2 to move along the length of the worktable 11. The protective cover 4 is set on the workbench 11 and covers the drilling unit 2. Its contact surface contacts the wall surface before the drilling unit 2, in order to prevent debris from splashing and collect it. The collecting component 5 is mounted on the workbench 11 and connected to the protective cover 4, and is used to discharge debris from inside the protective cover 4.

[0016] In practice, the vehicle body 1 moves until the contact surface of the protective cover 4 contacts the wall, thereby forming a relatively closed space in the drilling area of ​​the wall. Then, the feed unit drives the drilling unit 2 to move closer to the wall until the drill rod of the drilling unit 2 contacts the wall and begins drilling. During the operation, the debris generated is blocked by the protective cover 4 to prevent debris from splashing. At the same time, the protective cover 4 collects the debris. Then, the collecting component 5 works and discharges the debris in the protective cover 4 to prevent the debris from accumulating and interfering with the operation of the drill rod.

[0017] In this invention, the protective cover 4 first contacts the wall to form a relatively closed drilling space. During subsequent drill rod operation, the debris is intercepted and collected by the protective cover 4, thereby reducing debris splashing and ensuring the personal safety of the workers. At the same time, the collecting component 5 discharges the debris inside the protective cover 4 to ensure the normal operation of the drilling unit 2.

[0018] It should be noted that the bottom of the protective cover 4 may be provided with a screen hole (not shown in the figure). When the cooling medium is sprayed out through the drill rod and cooled, the screen hole facilitates the discharge of the cooled medium from the protective cover 4.

[0019] It should be noted that the contact end of the protective cover 4 can be made of transparent material such as PC with good impact resistance, so that while ensuring the normal operation of the protective cover 4, it can also facilitate the staff to observe the drilling situation.

[0020] The structure and function of the vehicle body 1 and the drilling unit 2 are common knowledge to those skilled in the art, so they will not be described in detail here.

[0021] In one embodiment, the worktable 11 has a chamber 111 inside; The collection component 5 includes a collection bin 51 disposed at the end of the workbench 11 away from the wall and connected to the chamber 111, for storing debris; The chamber 111 is also equipped with a spiral conveyor 52, one end of which is rotatably connected to the inner wall of the abutment end of the protective cover 4 and located at the debris accumulation point, for conveying debris to the collection bin 51. It also includes a belt drive member 53 disposed between the screw conveyor 52 and the feed member 3, which drives the screw conveyor 52 to rotate via the belt drive member 53.

[0022] With this design, while the feed component 3 moves the drilling unit 2, the feed component 3 drives the screw conveyor 52 to rotate through the belt drive component 53, so that the screw conveyor 52 transports the impurities accumulated in the protective cover 4 to the chamber 111, until the impurities are transported to the collection bin 51 for storage. Then, the staff can uniformly process the impurities in the collection bin 51.

[0023] In one embodiment, the feed component 3 includes a screw 31 rotatably inserted in the worktable 11, the screw 31 being threadedly connected to the drilling unit 2 and used to drive the drilling unit 2 to move toward or away from the wall surface; The workbench 11 is also equipped with a power unit 32 at the end away from the wall. The moving end of the power unit 32 is connected to one end of the belt transmission component 53. The power unit 32 drives the screw 31 to rotate while driving the screw conveyor 52 to rotate. It also includes a coupling unit 33 disposed between the power unit 32 and the screw 31. When the power unit 32 drives the screw 31 to rotate, the coupling unit 33 is used to protect the power unit 32.

[0024] With this design, when the drilling unit 2 needs to be moved, the power unit 32 drives the screw 31 to rotate through the coupling unit 33, thereby moving the drilling unit 2 towards or away from the wall. At the same time, the power unit 32 drives the screw conveyor 52 to rotate through the belt drive component 53 to transport the debris in the protective cover 4 and discharge it. When the drilling unit 2 is drilling, it will encounter resistance. During the operation of the power unit 32, the coupling unit 33 ensures that the power unit 32 drives the screw conveyor 52 to rotate, while avoiding overload caused by the resistance of the drill rod during the rotation of the screw 31 driven by the power unit 32, so as to prevent damage to the power unit 32.

[0025] Preferably, the power unit 32 can be an electric motor from the prior art.

[0026] Preferably, the coupling unit 33 can be a magnetic coupling as used in the prior art.

[0027] In one embodiment, the protective cover 4 is slidably disposed on the workbench 11, and the workbench 11 is also provided with a positioning cover 6, which is sleeved on the protective cover 4; A first elastic unit 41 is also provided between the protective cover 4 and the work platform 11. The first elastic unit 41 applies an elastic force to the protective cover 4 in the direction away from the rear of the vehicle. The screw conveyor 52 includes a conveying section 521 rotatably inserted into the chamber 111 and a connecting section 522 slidably inserted into the conveying section 521 and rotatably inserted into the chamber 111 near the rear of the vehicle. One end of the belt drive member 53 is connected to the connecting section 522. The rear of the vehicle body 1 is also equipped with a telescopic support rod 7, and a second elastic unit 71 is provided between the fixed end and the telescopic end of the support rod 7, which is used to apply a pulling force to its telescopic end in the direction away from the ground. The support rod 7 is also provided with a torsion spring (not shown in the figure) at the rotatable connection. The torsion spring is used to apply a downward rotational torque to the support rod 7. A transmission component 8 is also provided between the protective cover 4 and the positioning cover 6. The movable end of the transmission component 8 is connected to the protective cover 4, and the other end is connected to the support rod 7. When the protective cover 4 retracts, it drives the support rod 7 to extend and contact the ground through the transmission component 8.

[0028] With this design, when the abutting end of the protective cover 4 contacts the wall, the vehicle body 1 moves further towards the wall. At this time, the protective cover 4 is compressed and moves towards the support rod 7. The first elastic unit 41 is compressed, and the conveying section 521 moves with the protective cover 4, so that the connecting section 522 is inserted into the conveying section 521 to avoid the screw conveyor 52 interfering with the movement of the protective cover 4. During the movement of the protective cover 4, the support rod 7 extends through the transmission component 8 until the telescopic end of the support rod 7 abuts against the ground and applies downward pressure. At this time, the second elastic unit 71 is stretched. As the vehicle body 1 continues to move, the support rod 7 rotates. At this time, the torsion spring is compressed until the vehicle body 1 moves to the predetermined position. At this time, the support rod 7 is tilted relative to the vehicle body 1 and placed on the ground. Thus, the support force provided by the support rod 7 and the reaction force provided by the protective cover 4 pressing against the wall surface are combined to improve the stability of the vehicle body 1. At the same time, the torsion spring provides the support rod 7 with the downward rotation torque, so that the support rod 7 always abuts against the ground to avoid the support rod 7 from rotating accidentally. When the protective cover 4 no longer abuts against the wall, the first elastic unit 41 loses its constraint and moves the protective cover 4 away from the rear of the vehicle, thereby causing the protective cover 4 to reset. At the same time, the second elastic unit 71 loses its constraint and causes the telescopic end of the support rod 7 to retract and lift it off the ground. Subsequently, the corresponding torsion spring retracts to drive the support rod 7 to rotate downward until it resets.

[0029] It should be noted that the belt drive component 53 includes two synchronous pulleys respectively disposed on the moving end of the power unit 32 and the connecting section 522, and a synchronous belt connecting the two synchronous pulleys. When the power unit 32 rotates, the synchronous pulley disposed on the power unit 32 drives the other synchronous pulley on the connecting section 522 to rotate through the synchronous belt, thereby driving the screw conveyor 52 to rotate.

[0030] Preferably, the first elastic unit 41 can be a spring from the prior art.

[0031] Preferably, the second elastic unit 71 can be a tension spring as in the prior art.

[0032] In one embodiment, the transmission component 8 includes a push rod 81 disposed on the protective cover 4 near the rear end of the vehicle body 1; It also includes an oil tank 82 installed on the positioning cover 6, which has a first oil chamber 821 inside, and the first oil chamber 821 stores a pressure transmission medium. A hydraulic plate 83 is slidably disposed in the first oil chamber 821, and the connection between the hydraulic plate 83 and the first oil chamber 821 is a dynamic seal connection. The hydraulic plate 83 is used to push the pressure transmission medium. One end of the push rod 81 is inserted into the oil tank 82 and connected to the hydraulic plate 83. The connection between the push rod 81 and the first oil chamber 821 is a dynamic seal connection, which is used to drive the hydraulic plate 83 to move along the length of the oil tank 82. An oil delivery pipe 84 is also provided between the oil delivery tank 82 and the support rod 7, and one end of the oil delivery pipe 84 is connected to the first oil chamber 821 to deliver the pressure transmission medium to the support rod 7.

[0033] With this design, when the protective cover 4 retracts, the protective cover 4 drives the push rod 81 to move towards the rear end of the vehicle body 1, thereby driving the hydraulic plate 83 to push the pressure transmission medium, so that the pressure transmission medium is delivered to the support rod 7 through the oil pipe 84, thereby causing the support rod 7 to extend.

[0034] Preferably, the pressure transmission medium can be hydraulic oil, which is a technology in the prior art.

[0035] It should be noted that when the first elastic unit 41 moves the protective cover 4 away from the rear of the vehicle, the push rod 81 moves along with the protective cover 4, thereby causing the hydraulic plate 83 to actively draw the pressure transfer medium back into the first oil chamber 821. In one embodiment, the oil tank 82 is further provided with a second oil chamber 822, and a flow channel is provided between the two chambers to communicate with each other. The oil pipe 84 is provided with an oil inlet that communicates with each oil chamber respectively. The hydraulic plate 83 has an inclined surface, and the push rod 81 has an abutment surface; The oil tank 82 is equipped with an oil return component 9, which includes a lifting and lowering block 91 located in the first oil chamber 821 and at the corresponding outlet of the flow channel. The block 91 is respectively aligned with the inclined surface of the hydraulic plate 83 and the contact surface of the push rod 81, and is used to open and close the flow channel. The flow channel is provided with a telescopic rod 92, the telescopic end of which is connected to the sealing block 91 and is used to drive the sealing block 91 to move vertically up and down. A third elastic unit 93 is also provided between the fixed end and the telescopic end of the telescopic rod 92. The third elastic unit 93 applies a vertically downward elastic force to its telescopic end. It also includes a pressure valve 94 installed on the positioning cover 6 and located at the connection between the oil pipeline 84 and the second oil chamber 822, for controlling the pressure transmission medium to enter the second oil chamber 822; A one-way valve 95 is provided in the second oil chamber 822 and at the flow channel connection point to control the unidirectional flow of the pressure transmission medium in the second oil chamber 822 into the first oil chamber 821.

[0036] With this design, when the hydraulic plate 83 moves and squeezes the pressure transmission medium, the inclined surface of the hydraulic plate 83 contacts the sealing block 91 and applies a vertical upward thrust to it, thereby closing the flow channel of the sealing block 91. Subsequently, the hydraulic plate 83 continues to move, and the abutting surface of the push rod 81 contacts the sealing block 91 to prevent the sealing block 91 from moving, thereby preventing the flow channel from opening accidentally. The pressure transmission medium enters the support rod 7 through the oil supply pipe 84 and drives its telescopic end to extend. At this time, the oil pressure in the oil supply pipe 84 is less than the predetermined value of the pressure valve 94, and the pressure valve 94 prevents the pressure transmission medium from entering the second oil chamber 822. When the support rod 7 extends to the appropriate position, but the protective cover 4 has not yet moved to the appropriate position, the hydraulic plate 83 continues to move and squeeze the pressure transmission medium. At this time, the oil pressure in the oil pipe 84 increases until it exceeds the predetermined value of the pressure valve 94. At this time, the pressure transmission medium in the oil pipe 84 enters the second oil chamber 822 through the pressure valve 94, thereby storing the excess pressure transmission medium in the second oil chamber 822 without affecting the operation of the support rod 7. When the hydraulic plate 83 moves closer to the wall and separates from the sealing block 91, the third elastic unit 93 loses its constraint and drives the sealing block 91 to move downward through the telescopic rod 92. At this time, the flow channel opens, and the pressure transmission medium in the second oil chamber 822 flows back to the first oil chamber 821 through the one-way valve 95.

[0037] Preferably, the third elastic unit 93 can be a spring from the prior art.

[0038] In one embodiment, the contact surface of the protective cover 4 is further provided with an elastically deformable adhesive plate 42. When the adhesive plate 42 is squeezed, the adhesive plate 42 deforms and adheres to the wall surface to increase the contact area between the protective cover 4 and the wall surface.

[0039] With this design, when the protective cover 4 moves toward the wall, the bonding plate 42 first contacts the wall. As the protective cover 4 continues to move, the bonding plate 42 is squeezed and deformed according to the actual situation of the wall, thereby reducing the gap between the bonding plate 42 and the wall, making it fit the wall better, and further improving the stability of the protective cover 4.

[0040] Preferably, the bonding board 42 can be made of materials with high elastic deformation capacity, such as sponge and rubber, which are available in the prior art.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] Additionally, "multiple" refers to two or more.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large-diameter drilling pressure relief device, characterized in that, include: Vehicle body (1), drilling unit (2), feeding component (3), protective cover (4) and collection component (5); The vehicle body (1) is equipped with a work platform (11); The drilling unit (2) is slidably mounted on the workbench (11); The feed component (3) is disposed inside the worktable (11) and connected to the drilling unit (2), and is used to drive the drilling unit (2) to move along the length direction of the worktable (11); The protective cover (4) is set on the workbench (11) and covers the drilling unit (2). Its contact surface contacts the wall surface before the drilling unit (2) to prevent debris from splashing and to collect it. The collecting component (5) is mounted on the workbench (11) and connected to the protective cover (4) for discharging debris from the protective cover (4).

2. The large-diameter drilling pressure relief device according to claim 1, characterized in that: The workbench (11) has a chamber (111) inside; The collecting component (5) includes a screw conveyor (52), a belt drive component (53), and a collecting bin (51); The collection bin (51) is disposed on the workbench (11) and connected to the chamber (111) for storing debris; The screw conveyor (52) is rotatably inserted into the chamber (111), with one end connected to the opening of the protective cover (4) for conveying debris to the collection bin (51). The belt drive component (53) is disposed between the screw conveyor (52) and the feed component (3), so that the feed component (3) drives the screw conveyor (52) to rotate.

3. The large-diameter drilling pressure relief device according to claim 2, characterized in that: The feeding component (3) includes a screw (31) rotatably inserted into the worktable (11), a power unit (32), and a coupling unit (33); The screw (31) is threadedly connected to the drilling unit (2) and is used to drive the drilling unit (2) to move closer to or further away from the wall. The power unit (32) is set on the workbench (11), and one end of the belt drive component (53) is connected to the moving end of the power unit (32). The power unit (32) is used to drive the screw (31) to rotate while driving the screw conveyor (52) to rotate. The coupling unit (33) is disposed between the power unit (32) and the screw (31) to protect the power unit (32).

4. The large-diameter drilling pressure relief device according to claim 2, characterized in that: The protective cover (4) is slidably disposed on the workbench (11), and the workbench (11) is also provided with a positioning cover (6), and the positioning cover (6) is sleeved on the protective cover (4); The screw conveyor (52) is telescopically disposed within the chamber (111) to avoid interfering with the movement of the protective cover (4); The rear of the vehicle body (1) is also provided with a telescopic support rod (7), and a torsion spring is provided at its rotatable connection. The torsion spring is used to apply a downward rotational torque to the support rod (7). A transmission component (8) is also provided between the protective cover (4) and the positioning cover (6). The movable end of the transmission component (8) is connected to the protective cover (4), and the other end is connected to the support rod (7). During the movement of the protective cover (4), the transmission component (8) drives the telescopic end of the support rod (7) to extend and contact the ground.

5. The large-diameter drilling pressure relief device according to claim 4, characterized in that: The transmission component (8) consists of a push rod (81) mounted on the protective cover (4), an oil tank (82) mounted on the positioning cover (6), a hydraulic plate (83) and an oil pipe (84); The oil tank (82) has a first oil chamber (821) inside, which stores a pressure transmission medium; The hydraulic plate (83) is slidably disposed in the first oil chamber (821); One end of the push rod (81) is inserted into the first oil chamber (821) and connected to the hydraulic plate (83) to drive the hydraulic plate (83) to move along the length of the oil tank (82); One end of the oil pipe (84) is connected to the first oil chamber (821), and the other end is connected to the support rod (7) for conveying the pressure transmission medium into the support rod (7).

6. The large-diameter drilling pressure relief device according to claim 5, characterized in that: The oil tank (82) is also provided with a second oil chamber (822), and the two chambers are connected by a flow channel. The oil pipe (84) is provided with an oil inlet that is connected to each oil chamber. The oil tank (82) is equipped with an oil return component (9), which includes a sealing block (91), a telescopic rod (92), a one-way valve (95), and a pressure valve (94). The sealing block (91) is vertically and vertically disposed in the first oil chamber (821) and corresponds to the hydraulic plate (83) and the push rod (81) respectively, so as to open and close the flow channel; Both the hydraulic plate (83) and the push rod (81) can contact the sealing block (91) and apply a vertically upward thrust to it; The telescopic rod (92) is telescopically disposed within the flow channel and connected to the sealing block (91); The pressure valve (94) is mounted on the positioning cover (6) and located at the connection between the oil pipeline (84) and the second oil chamber (822), and is used to control the pressure transmission medium to enter the second oil chamber (822); The one-way valve (95) is located at the flow channel connection of the second oil chamber (822), allowing the pressure transmission medium to flow into the first oil chamber (821) in one direction.

7. The large-diameter drilling pressure relief device according to claim 1, characterized in that: The protective cover (4) is further provided with a bonding plate (42) on its contact surface to increase the contact area between the protective cover (4) and the wall surface.

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