Energy-saving reaming device for geological exploration

Abstract

The invention discloses an energy-saving reaming device for geological exploration, and relates to the technical field of geological exploration. The device comprises a supporting body disc, a pinch plate supporting body and a center fixing body, a swinging reaming blade is arranged outside the center fixing body, and the angle of the reaming blade is controlled through water pressure injected into a drill rod. A piston disc, an outer side sleeve, an inner side sleeve and a thread transmission structure are arranged, so that the broaching blade is gradually unfolded; and meanwhile, stable locking of the reaming angle is achieved through cooperation of the locking limiting block and the locking limiting shaft. The device is provided with an exhaust hole, an injection hole and a one-way valve, and it is ensured that fluid pressure is effectively adjusted in the reaming process. Different from a traditional mode that the drill bit needs to be replaced many times, the device can finish reaming of different diameters only through one-time replacement, energy consumption is remarkably reduced, efficiency is improved, and the device is particularly suitable for deep well and shale gas exploitation operation.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, specifically to an energy-saving borehole enlargement device for geological exploration. Background Technology

[0002] In the application of equipment for geological exploration and shale gas extraction, drilling and reaming are crucial processes. Current drilling operations typically rely on progressively changing drill bits of different diameters to enlarge the borehole. Specifically, in the initial stage, a small-diameter borehole is drilled using a standard drill bit, and then larger-diameter drill bits are used to enlarge the borehole. Because deep wells, especially oil wells or shale gas wells, are generally quite deep, each drill bit change requires pulling the entire drill pipe to the surface for disassembly and reassembly. This process is not only complex but also consumes a tremendous amount of energy. Furthermore, frequent drill bit changes extend operation time, accelerate equipment wear, and significantly reduce construction efficiency. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: an energy-saving borehole enlargement device for geological exploration, comprising a support plate and a buckle plate support, wherein a central fixing body is fixedly installed between the support plate and the buckle plate support; at least four borehole enlargement blades are contacted and overlapped on the outer surface of the central fixing body, each borehole enlargement blade is rotatably installed between the support plate and the buckle plate support via a borehole enlargement blade pivot, and four adjusting swing arms fixedly fitted with the borehole enlargement blade pivot are rotatably installed on the opposite sides of the support plate and the buckle plate support, each adjusting swing arm is fixedly equipped with an adjusting pin, and a sealing buckle cover is fixedly installed on the opposite sides of the support plate and the buckle plate support, wherein a swing adjusting plate is rotatably fitted on the inner side of the sealing buckle cover, and a swing adjusting groove is provided on the swing adjusting plate to slide with the adjusting pin; two swing adjusting plates are coaxially fixedly fitted together via a main shaft, the main shaft being rotatably fitted at the axial center of the central fixing body.

[0004] Preferably, the buckle plate support body and the central fixing body are fixedly connected by a threaded sleeve, and the axial position of the threaded sleeve is set as a through hole to facilitate the insertion of the main shaft; wherein the adjusting pin is slidably inserted into the swing adjusting groove, so that the adjusting pin slides inside the swing adjusting groove, and the swing adjusting groove is arranged radially along the swing adjusting disc.

[0005] Preferably, a bullet-shaped body is fixedly installed on the sealing cover fixed to the support plate, and a threaded block limiting sleeve is coaxially fixed on the sealing cover fixed to the buckle plate support. A first vent hole is provided at the end of the threaded block limiting sleeve connected to the sealing cover. A threaded rod is coaxially fixed at the end of the main shaft near the threaded block limiting sleeve. The threaded rod is located inside the threaded block limiting sleeve, and a threaded block is threaded onto the threaded rod. The threaded block and the inner wall of the threaded block limiting sleeve are engaged by a spline sliding fit. A spring is fixedly installed between the threaded block and the opposite surface of the sealing cover, and the spring is wrapped around the outside of the threaded rod. A boss is provided at the top of the threaded block limiting sleeve to limit the displacement of the threaded block and prevent the threaded block from separating from the threaded block limiting sleeve. It should be noted that the pitch between the threaded rod and the threaded block is less than the length of the threaded rod itself.

[0006] Preferably, an outer sleeve is slidably and sealingly fitted on the outer circumferential surface of the threaded block limiting sleeve, and a piston disc is fixedly fitted at the bottom end of the outer sleeve. The piston disc is also fitted on the outer circumferential surface of the threaded block limiting sleeve. An inner sleeve is fixedly installed on the threaded block, and the top end of the inner sleeve is fixedly engaged with the top end of the outer sleeve. A second vent hole is provided at the fixed connection position of the top ends of the outer sleeve and the inner sleeve.

[0007] Preferably, an intermediate outer shell is coaxially sleeved on the outer side of the threaded block limiting sleeve. The intermediate outer shell is fixed to the sealing buckle cover, and the inner wall of the intermediate outer shell slides and seals with the piston disc. A third vent hole is provided at one end of the intermediate outer shell facing the sealing buckle cover. The third vent hole is used to connect the inner and outer sides of the intermediate outer shell, and it is also connected to the first vent hole. A first injection hole is provided at the top of the intermediate outer shell. The first injection hole is connected to the top space inside the intermediate outer shell, which is divided into a top space and a bottom space by the piston disc (the intermediate outer shell is divided into a top space and a bottom space by the piston disc, and the bottom space is connected to the outside through the third vent hole).

[0008] Preferably, the intermediate outer shell and the outer sleeve are coaxially arranged and slidably sealed together. A top outer shell is coaxially fixed on the intermediate outer shell and sleeved on the outside of the outer sleeve. A locking and limiting shaft is also fixedly installed at the top end connection of the outer sleeve and the inner sleeve. The locking and limiting shaft is slidably sealed with the top end of the top outer shell. A second injection hole is provided at the top end of the top outer shell. A space is provided between the outer surface of the outer sleeve and the locking and limiting shaft and the inner wall of the top outer shell, which allows the first injection hole and the second injection hole to communicate.

[0009] Preferably, two symmetrically arranged unlocking sliding holes are provided in the radial direction of the top shell. Each unlocking sliding hole has an unlocking sliding pin inserted in a sliding seal (the two are in spline sliding fit). A locking limiting block is fixedly installed on the end of each unlocking sliding pin facing the locking limiting shaft. A locking spring is sleeved around each unlocking sliding pin. The two ends of the locking spring are fixedly fitted with the locking limiting block and the inner wall of the top shell. Multiple grooves are provided on the outer surface of the locking limiting shaft. The locking limiting block is provided with a protrusion that engages with the grooves on the locking limiting shaft to limit the movement of the locking limiting shaft in the axial direction of the top shell.

[0010] Preferably, a pressure injection connection housing is coaxially fixed on the top housing, and an exhaust chamber is provided inside the pressure injection connection housing. The locking and limiting shaft is located inside the exhaust chamber, and the exhaust chamber is connected to the outside of the pressure injection connection housing in one direction through a one-way valve. A pressure injection channel connected to the second pressure injection hole is also provided inside the pressure injection connection housing, and a connecting pressure injection chamber connected to the pressure injection channel is provided at the end of the pressure injection connection housing away from the top housing.

[0011] Compared with the prior art, the present invention has the following advantages: (1) The present invention achieves adjustable reaming blade angle by injecting water pressure into the drill pipe, eliminating the need to replace the drill bit step by step. Only one device replacement is required after the initial drilling to complete multi-stage reaming. This avoids frequent drill pipe lifting operations, fundamentally reducing energy consumption. It is particularly suitable for deep well operations such as oil wells and shale gas extraction, saving a lot of mechanical energy and labor costs; (2) The swing angle of the reaming blade in the present invention is controlled by water pressure, which can gradually expand from a small angle to a large angle, realizing the gradual expansion of the hole diameter. Compared with the traditional method that relies on fixed-specification drill bits, this device can complete the adjustment of multiple diameters in one construction, making the construction process more flexible, the reaming diameter control more precise, and meeting the needs of different geological conditions. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the exhaust chamber structure of the present invention.

[0014] Figure 3 This is a schematic diagram of the locking and limiting shaft structure of the present invention.

[0015] Figure 4 This is a schematic diagram of the piston disc structure of the present invention.

[0016] Figure 5 This is a schematic diagram of the threaded block structure of the present invention.

[0017] Figure 6 This is a schematic diagram of the structure of the swing adjustment slide of the present invention.

[0018] Figure 7 This is a schematic diagram of the central fixing body structure of the present invention.

[0019] In the diagram: 101-Support plate; 102-Reamer shaft; 103-Reamer; 104-Adjusting arm; 105-Adjusting pin; 106-Threaded sleeve; 107-Screw plate support; 108-Main shaft; 109-Center fixing body; 110-Sealing cover; 111-Swing adjustment plate; 112-Swing adjustment groove; 113-Threaded rod; 114-Bullet head body; 115-First vent; 116-Spring; 117-Threaded block limiting sleeve; 118-Threaded block; 119-Piston Disc; 120-Outer sleeve; 121-Inner sleeve; 122-Second vent hole; 123-Third vent hole; 124-First injection hole; 125-Intermediate housing; 126-Top housing; 127-Unlocking sliding hole; 128-Unlocking sliding post; 129-Locking spring; 130-Locking limiting block; 131-Locking limiting shaft; 132-Second injection hole; 133-Injection connecting housing; 134-Injection channel; 135-Connecting injection chamber; 136-One-way valve; 137-Vacuum chamber. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-7 The technical solution of the present invention will be further illustrated through specific embodiments.

[0021] This invention provides an energy-saving borehole enlargement device for geological exploration, comprising a support plate 101 and a snap-on support 107, with a central fixing body 109 fixedly installed between the support plate 101 and the snap-on support 107; at least four borehole enlargement blades 103 are overlapped on the outer surface of the central fixing body 109, each borehole enlargement blade 103 being rotatably mounted between the support plate 101 and the snap-on support 107 via a borehole enlargement blade pivot 102, and four borehole enlargement blades 103 are rotatably mounted on opposite sides of the support plate 101 and the snap-on support 107, respectively, in relation to the borehole enlargement blade pivot 102. 2. Fixed adjustment arms 104 are provided. Adjustment pins 105 are fixedly mounted on all adjustment arms 104. Sealing covers 110 are also fixedly mounted on the opposite sides of the support plate 101 and the buckle support 107. Swing adjustment discs 111 are rotatably mounted on the inner side of the sealing cover 110. Swing adjustment discs 111 are provided with swing adjustment grooves 112 that slide with the adjustment pins 105. The two swing adjustment discs 111 are coaxially fixedly coupled through the main shaft 108. The main shaft 108 is rotatably coupled at the axis of the central fixed body 109. The buckle support 107 and the central fixing body 109 are fixedly connected by a threaded sleeve 106, and the axial position of the threaded sleeve 106 is set as a through hole to facilitate the insertion of the main shaft 108; the adjusting pin 105 is slidably inserted into the swing adjusting groove 112, so that the adjusting pin 105 slides inside the swing adjusting groove 112, and the swing adjusting groove 112 is arranged radially along the swing adjusting plate 111. A bullet-shaped body 114 is fixedly mounted on a sealing cover 110 fixed to the support plate 101. A threaded block limiting sleeve 117 is coaxially fixed on the sealing cover 110 fixed to the buckle plate support 107. A first vent hole 115 is opened at the end of the threaded block limiting sleeve 117 connected to the sealing cover 110. A threaded rod 113 is coaxially fixed at the end of the main shaft 108 near the threaded block limiting sleeve 117. The threaded rod 113 is located inside the threaded block limiting sleeve 117. A threaded block 118 is threadedly fitted on the threaded rod 113. The threaded block 118 and the inner wall of the threaded block limiting sleeve 117 are engaged by a spline sliding fit. A spring 116 is fixedly installed between the opposite surfaces of the threaded block 118 and the sealing cover 110. The spring 116 is wrapped around the outside of the threaded rod 113. A boss is provided at the top of the threaded block limiting sleeve 117 to limit the displacement of the threaded block 118 and prevent the threaded block 118 from separating from the threaded block limiting sleeve 117. It should be noted that the pitch between the threaded rod 113 and the threaded block 118 is less than the length of the threaded rod 113 itself.

[0022] An outer sleeve 120 is slidably and sealingly fitted on the outer circumferential surface of the threaded block limiting sleeve 117. A piston disc 119 is fixedly fitted at the bottom end of the outer sleeve 120. The piston disc 119 is also fitted on the outer circumferential surface of the threaded block limiting sleeve 117. An inner sleeve 121 is fixedly installed on the threaded block 118. The top end of the inner sleeve 121 is fixedly engaged with the top end of the outer sleeve 120. A second vent hole 122 is provided at the fixed connection position of the top ends of the outer sleeve 120 and the inner sleeve 121. An intermediate outer shell 125 is coaxially fitted on the outer side of the threaded block limiting sleeve 117. The intermediate outer shell 125 is fixed on the sealing buckle cover 110. The inner wall of the intermediate outer shell 125 is in sliding sealing fit with the piston disc 119. A third vent hole 123 is opened at one end of the intermediate outer shell 125 facing the sealing buckle cover 110. The third vent hole 123 is used to connect the inner and outer sides of the intermediate outer shell 125. At the same time, the third vent hole 123 is also connected to the first vent hole 115. A first injection hole 124 is opened at the top of the intermediate outer shell 125. The first injection hole 124 is connected to the top space inside the intermediate outer shell 125, which is divided into a top space and a bottom space by the piston disc 119. The bottom space is connected to the outside through the third vent hole 123. The intermediate outer shell 125 and the outer sleeve 120 are coaxially arranged and slidably sealed together. A top outer shell 126 is coaxially fixed on the intermediate outer shell 125 and is sleeved on the outside of the outer sleeve 120. A locking and limiting shaft 131 is also fixedly installed at the top end connection of the outer sleeve 120 and the inner sleeve 121. The locking and limiting shaft 131 is slidably sealed with the top end of the top outer shell 126. A second injection hole 132 is provided at the top end of the top outer shell 126. A space is provided between the outer surface of the outer sleeve 120 and the locking and limiting shaft 131 and the inner wall of the top outer shell 126, which allows the first injection hole 124 and the second injection hole 132 to communicate. Two symmetrically arranged unlocking sliding holes 127 are provided in the radial direction of the top housing 126. An unlocking sliding post 128 is slidably and sealed into each unlocking sliding hole 127 (the two are in spline sliding fit). A locking limiting block 130 is fixedly installed on one end of each unlocking sliding post 128 facing the locking limiting shaft 131. A locking spring 129 is sleeved around each unlocking sliding post 128. The two ends of the locking spring 129 are fixedly fitted with the locking limiting block 130 and the inner wall of the top housing 126. Multiple grooves are provided on the outer surface of the locking limiting shaft 131. The locking limiting block 130 is provided with a protrusion that engages with the grooves on the locking limiting shaft 131 to limit the movement of the locking limiting shaft 131 in the axial direction of the top housing 126.A pressure injection connection housing 133 is coaxially fixed on the top housing 126. An exhaust chamber 137 is provided inside the pressure injection connection housing 133. The locking and limiting shaft 131 is located inside the exhaust chamber 137. The exhaust chamber 137 is connected to the outside of the pressure injection connection housing 133 through a one-way valve 136. A pressure injection channel 134 is also provided inside the pressure injection connection housing 133, which is connected to the second pressure injection hole 132. A connecting pressure injection chamber 135 is provided at the end of the pressure injection connection housing 133 away from the top housing 126, which is connected to the pressure injection channel 134.

[0023] The working principle of the energy-saving borehole reaming device for geological exploration disclosed in this invention is as follows: The injection chamber 135 is connected to the drill pipe, and the inside of the drill pipe is connected to the injection chamber 135 and the injection channel 134. Initially, the drill pipe carries a regular drill bit for drilling, and different sized drill bits need to be constantly changed to reach the set diameter. Traditionally, this method requires changing the drill bit one at a time. While this is acceptable for shallow wells, it becomes inefficient for very deep wells, such as oil wells, and each drill pipe pull consumes a significant amount of energy. However, with this device, only one change is needed: a regular drill bit is used for drilling, and then the device is used for reaming. Specifically, water is injected into the pressure chamber 135 and pressure channel 134 through the drill rod (the pressure of the injected water is controllable). The water pressure enters the top housing 126 through the pressure channel 134 and the second pressure hole 132. Then, under the action of pressure difference, it pushes the two unlocking sliding pins 128 (including the locking limiting blocks 130 on the unlocking sliding pins 128) to move away from the axis of the top housing 126. At the same time, the locking spring 129 is compressed. At this time, the two locking limiting blocks 130 will separate from the locking limiting shaft 131, so that the locking limiting blocks 130 no longer restrict the axial movement of the locking limiting shaft 131. Simultaneously, pressure also enters the intermediate housing 125 through the first injection hole 124, pushing the piston disc 119 towards the sealing cover 110. The movement of the piston disc 119 drives the outer sleeve 120 to move, which in turn drives the inner sleeve 121 to move (the second vent hole 122, the axial through hole of the locking limiting shaft 131, and the one-way valve 136 are all for venting and releasing the pressure when the outer sleeve 120 and the inner sleeve 121 are squeezed). The inner sleeve 121 drives the threaded block 118 to move. Since the threaded block 118 can only slide axially within the threaded block limiting sleeve 117, it drives the threaded rod 113 to rotate and compresses the spring 116. The rotation of the threaded rod 113 drives the main shaft 108 to rotate. The main shaft 108 drives the swing adjustment plate 111 to rotate. The swing adjustment groove 112 on the swing adjustment plate 111 will drive the adjustment pin 105 to move accordingly. At the same time, the adjustment pin 105 slides in the swing adjustment groove 112. The adjustment pin 105 drives the adjustment arm 104 to move. The adjustment arm 104 drives the reaming blade shaft 102 to swing. The reaming blade shaft 102 drives the reaming blade 103 to swing. All the reaming blades 103 swing synchronously. The larger the swing angle of the reaming blade 103, the larger the diameter of the hole to be enlarged. At the same time, the compression of the spring 116 is greater. Therefore, by changing the pressure of the water injected into the drill pipe, the swing angle of the reaming blade 103 can be changed, swinging from a small angle to a large angle. Each swing does not require the drill bit to be removed from the well.

[0024] After each adjustment, once the reaming blade 103 is fixed at the set angle, there is no need to continue injecting pressure into the drill pipe. Before this, the reaming blade 103 needs to be in contact with the well wall. After rotating it a certain angle, the edge of the reaming blade 103 cuts into the well wall. Then, the water pressure in the drill pipe is stopped. At this time, the two locking limiting blocks 130 are reset under the elastic force of the locking spring 129, re-limiting the axial movement of the locking limiting shaft 131. If the locking limiting shaft 131 cannot move axially, the outer sleeve 120, inner sleeve 121, piston disc 119, threaded block 118, and threaded rod 113 will not be able to move, thus locking the reaming blade 103. At this point, the reaming blade 103 can be rotated again to enlarge the well wall. Each time the diameter is enlarged, the above process only needs to be repeated (repeated step by step).

Claims

1. An energy-saving borehole enlargement device for geological exploration, characterized in that: The device includes a support plate (101) and a buckle plate support (107), with a central fixing body (109) fixedly installed between the support plate (101) and the buckle plate support (107). At least four expanding blades (103) are lapped on the outer surface of the central fixing body (109). Each expanding blade (103) is rotatably mounted between the support plate (101) and the buckle plate support (107) via an expanding blade pivot (102). Furthermore, four adjusting arms (103) are rotatably mounted on opposite sides of the support plate (101) and the buckle plate support (107), and these arms are fixedly fitted to the expanding blade pivot (102). 104), all the adjusting arms (104) are fixedly equipped with adjusting pins (105), and the back sides of the support plate (101) and the buckle plate support (107) are also fixedly installed with sealing buckle covers (110). The inner side of the sealing buckle cover (110) is equipped with a swing adjusting plate (111). The swing adjusting plate (111) is provided with a swing adjusting groove (112) that slides with the adjusting pin (105). The two swing adjusting plates (111) are fixedly connected to each other through the main shaft (108). The main shaft (108) is rotated and connected at the axis of the central fixed body (109).

2. The energy-saving borehole enlargement device for geological exploration according to claim 1, characterized in that: The buckle support (107) and the center fixing body (109) are fixedly connected by a threaded sleeve (106), and the axial position of the threaded sleeve (106) is set as a through hole to facilitate the insertion of the main shaft (108); the adjusting pin (105) is slidably inserted into the swing adjusting groove (112), so that the adjusting pin (105) slides inside the swing adjusting groove (112), and the swing adjusting groove (112) is arranged radially along the swing adjusting plate (111).

3. The energy-saving borehole enlargement device for geological exploration according to claim 2, characterized in that: A bullet-shaped body (114) is fixedly installed on the sealing buckle cover (110) which is fixed to the support plate (101). A threaded block limiting sleeve (117) is coaxially fixed on the sealing buckle cover (110) which is fixed to the buckle plate support (107). A first vent hole (115) is opened at one end of the threaded block limiting sleeve (117) which is connected to the sealing buckle cover (110). A threaded rod (113) is coaxially fixed at one end of the main shaft (108) near the threaded block limiting sleeve (117). The threaded rod (113) is located inside the threaded block limiting sleeve (117). A threaded block (118) is threadedly fitted on the threaded rod (113). The threaded block (118) and the inner wall of the threaded block limiting sleeve (117) are fitted with a spline sliding engagement. A spring (116) is fixedly installed between the opposite surfaces of the threaded block (118) and the sealing buckle cover (110). The spring (116) is wrapped around the outside of the threaded rod (113).

4. The energy-saving borehole enlargement device for geological exploration according to claim 3, characterized in that: An outer sleeve (120) is slidably sealed on the outer circumferential surface of the threaded block limiting sleeve (117). A piston disc (119) is fixedly mounted at the bottom end of the outer sleeve (120). The piston disc (119) is also mounted on the outer circumferential surface of the threaded block limiting sleeve (117). An inner sleeve (121) is fixedly installed on the threaded block (118). The top end of the inner sleeve (121) is fixedly engaged with the top end of the outer sleeve (120). A second vent hole (122) is provided at the fixed connection position of the top ends of the outer sleeve (120) and the inner sleeve (121).

5. The energy-saving borehole enlargement device for geological exploration according to claim 4, characterized in that: The outer side of the threaded block limiting sleeve (117) is coaxially fitted with an intermediate outer shell (125). The intermediate outer shell (125) is fixed on the sealing buckle cover (110). The inner wall of the intermediate outer shell (125) is slidably sealed with the piston disc (119). The intermediate outer shell (125) has a third vent hole (123) at one end facing the sealing buckle cover (110). The third vent hole (123) is used to connect the inner and outer sides of the intermediate outer shell (125). At the same time, the third vent hole (123) is also connected with the first vent hole (115). The top of the intermediate outer shell (125) has a first injection hole (124).

6. The energy-saving borehole enlargement device for geological exploration according to claim 5, characterized in that: The intermediate outer shell (125) and the outer sleeve (120) are coaxially arranged and slidably sealed. The intermediate outer shell (125) and the outer sleeve (120) are coaxially fixed on the intermediate outer shell (125). The top outer shell (126) is sleeved on the outside of the outer sleeve (120). A locking and limiting shaft (131) is also fixedly installed at the top end connection of the outer sleeve (120) and the inner sleeve (121). The locking and limiting shaft (131) is slidably sealed with the top end of the top outer shell (126). The top end of the top outer shell (126) is provided with a second injection hole (132). There is a space between the outer surface of the outer sleeve (120) and the locking and limiting shaft (131) and the inner wall of the top outer shell (126). This space allows the first injection hole (124) and the second injection hole (132) to communicate.

7. The energy-saving borehole enlargement device for geological exploration according to claim 6, characterized in that: Two symmetrically arranged unlocking sliding holes (127) are provided in the radial direction of the top housing (126). An unlocking sliding post (128) is slidably and sealed in each unlocking sliding hole (127). A locking limiting block (130) is fixedly installed on one end of each unlocking sliding post (128) facing the locking limiting shaft (131). A locking spring (129) is sleeved around each unlocking sliding post (128). The two ends of the locking spring (129) are fixedly engaged with the locking limiting block (130) and the inner wall of the top housing (126). Multiple grooves are provided on the outer surface of the locking limiting shaft (131). A protrusion is provided on the locking limiting block (130) to engage with the grooves on the locking limiting shaft (131) to restrict the movement of the locking limiting shaft (131) in the axial direction of the top housing (126).

8. The energy-saving borehole enlargement device for geological exploration according to claim 7, characterized in that: A pressure injection connection housing (133) is coaxially fixed on the top housing (126). An exhaust chamber (137) is provided inside the pressure injection connection housing (133). A locking and limiting shaft (131) is located inside the exhaust chamber (137). The exhaust chamber (137) is connected to the outside of the pressure injection connection housing (133) through a one-way valve (136). A pressure injection channel (134) connected to the second pressure injection hole (132) is also provided inside the pressure injection connection housing (133). A connecting pressure injection chamber (135) connected to the pressure injection channel (134) is provided at one end of the pressure injection connection housing (133) away from the top housing (126).

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