Blocking device for metal pipeline

Abstract

The utility model discloses a metal pipeline lower plugging device which comprises a lower plugging adapter, a double-output hydraulic driving assembly is installed on the lower plugging adapter, an inner driving rod is arranged in the double-output hydraulic driving assembly, a plugging connecting assembly is arranged at one end of the double-output hydraulic driving assembly, and a plugging assembly is arranged on the plugging connecting assembly. A wrench rod is mounted on the inner driving rod; a clamping control assembly is mounted at the other end of the dual-output hydraulic driving assembly; the blocking assembly comprises a blocking plate, a sealing rubber ring, a plate pin and a blocking connector. The plug connecting assembly comprises a shifting pin seat, a ball cage, a ball and a cylindrical pin; the plate pin is provided with an inclined groove, and after the plug connecting assembly is connected with the plug assembly, the cylindrical pin is located in the inclined groove. The lower plugging device adopts a semi-automatic operation mode, is high in operation efficiency, reduces the operation intensity, is provided with a working state mark outside, prevents misoperation, is safe and reliable, and is high in plugging reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of metal pipeline plugging, in particular to a metal pipeline plugging device. Background Art

[0002] In the process of existing pipeline maintenance, rerouting, adding branches, etc., in order not to affect the use of users on the line, the pipeline non-stop construction method is often used. Pipeline non-stop construction requires welding plugging fittings on the pipeline, and then installing gate valves, hole openers, pluggers and other equipment on the pipe fittings to complete the opening and plugging of the pipeline, and then complete the pipeline maintenance, rerouting, adding branches and other work. After these works are completed, the excavated area needs to be backfilled, and after removing the plugger, it is necessary to install a plug in the plugging pipe fitting to complete the plugging of the pipe opening, and finally cover the blind plate and backfill. In the prior art, the overall feeding method of the plugging assembly is manual. Due to the pressure in the pipeline, the manual feeding method is time-consuming and labor-intensive, and the efficiency is low. The feeding amount cannot be observed intuitively, and there is a lack of external feedback on the equipment operation status. For example, the utility model patent with authorization announcement number CN201103767Y discloses a pipeline lower plug, which includes a main shaft with a screwing end and a connecting end. The main shaft is rotatably connected to a sleeve outside the screwing end, the sleeve is fixedly connected to a lower plug coupling box, the main shaft connecting end is located in the lower plug coupling box, a lower plug connecting head is detachably connected to the connecting end, a protrusion for detachably cooperating with a plugging plate is provided on the lower plug connecting head, the protrusions are at least two arc blocks spaced apart on the same rotation radius of the lower plug connecting head, the main shaft and the sleeve are designed to be rotatably cooperating inside and outside, a protrusion for detachably cooperating with the plugging plate is provided, so that the plugging plate can be easily removed or installed, and the operation is simple, but the device adopts manual feeding, and the internal installation position cannot be accurately identified and determined, and the operation requirements for the operator are high. Utility Model Content

[0003] The utility model aims to provide a metal pipe plugging device, which adopts a semi-automatic operation mode, has high operation efficiency, reduces operation intensity, is provided with a working status mark on the outside to prevent misoperation, is safe and reliable, and has high plugging reliability.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A metal pipe lower plugging device comprises a lower plugging adapter, on which a dual-output hydraulic drive component is detachably mounted, an inner drive rod is movably arranged in the dual-output hydraulic drive component, a plugging connection component is arranged on an output end of the dual-output hydraulic drive component located in the lower plugging adapter, a plugging component is detachably arranged on the plugging connection component, the dual-output hydraulic drive component can drive the plugging component to perform vertical linear reciprocating motion to adjust the position of the plugging component; a clamping control component is fixedly mounted on the other output end of the dual-output hydraulic drive component, the clamping control component is used to drive the inner drive rod to perform vertical displacement relative to the dual-output hydraulic drive component; the plugging component is lowered into a flange seat for plugging through the dual-output hydraulic drive component and the plugging connection component.

[0006] Preferably, the blocking assembly includes a blocking plate, a sealing rubber ring arranged on the circumference of the side wall of the blocking plate, a plurality of plate pins slidably arranged on the top of the blocking plate, and a blocking joint detachably mounted on the top of the blocking plate.

[0007] Preferably, the blocking connection assembly includes a pin seat fixedly connected to the inner driving rod, a ball cage fixedly mounted on the output end of the dual-output hydraulic driving assembly, a plurality of balls movably arranged on the ball cage and a plurality of cylindrical pins elastically mounted on the bottom of the pin seat, an annular groove for accommodating the balls is provided on the pin seat, the blocking joint is connected to the ball cage by the ball clamping, the position of the annular groove relative to the balls is controlled by the clamping control assembly, so as to realize the detachable connection between the blocking connection assembly and the blocking assembly; an oblique groove matched with the cylindrical pin is provided on the plate pin, when the blocking connection assembly is connected to the blocking assembly, the cylindrical pin is located in the oblique groove, the wrench rod is operated to rotate the inner driving rod, and the plate pin is extended or retracted outward through the cylindrical pin and the oblique groove.

[0008] Preferably, the dual-output hydraulic drive assembly includes a cylinder, a piston rod installed on the cylinder with a sliding seal, and an oil inlet and an oil outlet fixedly arranged on the cylinder, the piston rod is a hollow structure, the inner drive rod passes through the inner cavity of the piston rod, and both ends of the inner drive rod are located on the outside of the two ends of the piston rod.

[0009] Preferably, the lower blocking adapter includes a lower flange, a cylinder fixedly arranged on the top of the lower flange, and an upper cover fixedly arranged on the top of the cylinder, and sealing rings are arranged between the upper cover and the cylinder and between the lower flange and the cylinder; one end of the dual-output hydraulic drive assembly is installed on the upper cover.

[0010] Preferably, a wrench rod and a wrench block are mounted on the top end of the inner driving rod, and the wrench rod passes through the wrench block.

[0011] Preferably, a first marking ring is fixedly mounted on the top of the snap-on control assembly, and a first mark is provided on the wrench block; one end of the inner driving rod passes through the first marking ring and the locking knob; when the wrench rod drives the inner driving rod to rotate, the wrench block rotates relative to the first marking ring, and the position of the plate pin can be intuitively understood by observing the relative position between the first mark on the wrench block and the first marking ring.

[0012] Preferably, the card-connecting control assembly includes a locking nut fixedly mounted on the output end of the dual-output hydraulic drive assembly, a retaining ring fixedly mounted on the inner drive rod, a locking screw arranged on the outside of the retaining ring by friction, and a locking knob fixedly mounted on the locking screw, the locking screw is connected to the locking nut by a thread, and rotating the locking knob causes the inner drive rod to vertically displace relative to the dual-output hydraulic drive assembly.

[0013] Preferably, a second mark is provided on the locking nut, and an identification hole is provided on the locking knob, through which the second mark can be observed; during operation, the locking knob is rotated, and the connection status of the blocking component and the blocking connection component is judged according to the difference in the second mark observed through the identification hole.

[0014] Preferably, a plurality of slide grooves are provided on the plate pin, and threaded holes whose positions and numbers match those of the slide grooves are provided on the blocking plate; fastening screws are detachably mounted on the threaded holes, and the fastening screws pass through the slide grooves; a bushing is sleeved on the fastening screw, and the bushing is slidably arranged in the slide groove.

[0015] In the utility model, the dual-output hydraulic drive component is set to raise and lower the blocking component at a uniform and stable speed through the liquid pressure under the pressure of the gas without stopping the gas in the pipeline, thereby realizing semi-automatic operation, having the advantages of large carrying capacity and reducing manual labor intensity, thereby improving operation efficiency and safety.

[0016] By adjusting the rotation and height position of the inner driving rod, the state of the blocking component located inside the lower blocking adapter can be controlled. The first mark and the second mark located on the outside can clearly display the position state of the blocking component and the connection state of the blocking component and the blocking connecting component. The operator can intuitively understand the operating state of the device, prevent misoperation, and improve operating efficiency.

[0017] The connection and separation of the blocking component and the blocking connecting component can be conveniently controlled through the externally arranged card-connection control component, which facilitates the disassembly of the device, makes the connection of the blocking component stable and reliable, prevents the blocking plate from falling off due to misoperation, affects the overall operation efficiency, and improves the reliability of the operation.

[0018] After the plugging components are connected, the limit block is set to improve the stability of the plate pin connection, ensuring the reliability of subsequent plugging. The device is assembled with bolts as a whole. Different plugging adapters can be selected according to the pipeline to be operated during operation. It has good versatility and reduces the overall manufacturing cost.

[0019] The plugging joint is of special shape as a whole, which saves installation space, makes the device more compact, reduces the overall size of the device, and improves the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded state of the structure of the card-connection control component of the utility model;

[0022] Figure 3 It is a top view schematic diagram of the overall structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the disassembled state of the blocking component of the utility model;

[0024] Figure 5 This is a cross-sectional schematic diagram of the plugging state of the plugging component of the utility model;

[0025] Figure 6 This is a schematic diagram of the AA section of the utility model;

[0026] Figure 7 This is a schematic diagram of the BB section of the utility model;

[0027] Figure 8 It is a schematic diagram of the partial structure decomposition state of the utility model;

[0028] In the figure: 1. lower plug adapter; 2. dual-output hydraulic drive assembly; 3. inner drive rod; 4. plug connection assembly; 5. plug assembly; 6. snap-on control assembly; 7. wrench rod; 8. wrench block; 9. first marking ring; 10. lower flange; 11. cylinder; 12. upper cover; 13. bleed valve; 20. cylinder; 21. piston rod; 22. oil inlet; 23. oil outlet; 40. pin seat; 41. ball cage; 42. ball; 43. cylindrical pin; 44. ring groove; 50. plug plate; 51. sealing rubber ring; 52. plate pin; 53. plug joint; 54. inclined groove; 55. limit block; 56. slide groove; 57. fastening screw; 58. bushing; 60. locking nut; 61. retaining ring; 62. locking screw; 63. locking knob. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings:

[0030] like Figures 1 to 8 A metal pipe lower plugging device shown includes a lower plugging adapter 1, which includes a lower flange 10, a cylinder 11 fixedly arranged on the top of the lower flange 10 by bolts, and an upper cover 12 fixedly arranged on the top of the cylinder 11 by bolts. Sealing rings are arranged between the upper cover 12 and the cylinder 11 and between the lower flange 10 and the cylinder 11, so that the connection has good sealing performance. A through hole is arranged on the upper cover 12, and one end of the dual-output hydraulic drive component 2 is installed on the upper cover 12 by bolts, and the output end of the dual-output hydraulic drive component 2 passes through the through hole and is located in the inner cavity of the cylinder 11. In one embodiment, a vent valve 13 is sealed and fixedly arranged on the cylinder 11, and the gas in the lower plugging adapter 1 can be vented through the vent valve 13 during operation.

[0031] A dual-output hydraulic drive assembly 2 is detachably mounted on the lower plugging adapter 1 by bolts. The dual-output hydraulic drive assembly 2 includes a cylinder 20, a piston rod 21 mounted on the cylinder 20 with a sliding seal, and an oil inlet 22 and an oil outlet 23 fixedly arranged on the cylinder 20. During operation, the oil inlet 22 or the oil outlet 23 is pumped with oil by a hydraulic pump and a solenoid valve to control the extension and retraction of the piston rod 21. Specifically, a travel switch can be arranged on the cylinder 20. The displacement of the piston rod 21 is controlled by adjusting the position of the travel switch, thereby achieving precise control of the displacement of the plugging assembly 5 and improving operating efficiency and accuracy.

[0032] An inner drive rod 3 is movably arranged in the dual-output hydraulic drive assembly 2. In this embodiment, the piston rod 21 is a hollow structure, and the inner drive rod 3 passes through the inner cavity of the piston rod 21. Both ends of the inner drive rod 3 are located outside the two ends of the piston rod 21. A sealing ring is arranged between the inner drive rod 3 and the piston rod 21 to improve the sealing of the connection. A wrench rod 7 is detachably installed on the top end of the inner drive rod 3 by bolts, and the inner drive rod 3 can be rotated relative to the piston rod 21 by the wrench rod 7.

[0033] A blocking connection component 4 is provided on an output end of the dual-output hydraulic drive component 2 located in the lower blocking adapter 1. The blocking connection component 4 includes a pin seat 40 fixedly connected to the end of the inner drive rod 3 by bolts, a ball cage 41 fixedly installed on the output end of the dual-output hydraulic drive component 2 by bolts, a plurality of balls 42 movably arranged on the ball cage 41 and a plurality of cylindrical pins 43 elastically installed on the bottom of the pin seat 40. An annular groove 44 for accommodating the ball 42 is provided on the pin seat 40. The blocking joint 53 is connected to the ball cage 41 by snap-fitting the ball 42. The position of the annular groove 44 relative to the ball 42 is controlled by the snap-fit ​​control component 6 to realize the detachable connection between the blocking connection component 4 and the blocking component 5. In one embodiment, four vertical stepped through holes are provided on the plugging joint 53, screws are installed in the vertical stepped through holes, an internal threaded connection hole is provided on the top of the cylindrical pin 43, the cylindrical pin 43 is connected to the screw by threads, a spring is provided between the top of the cylindrical pin 43 and the stepped through hole, when the cylindrical pin 43 is located above the inclined groove 54, the cylindrical pin 43 can enter the inclined groove 54 under the action of the spring, improving the convenience of the connection between the two. A sealing ring is provided on the ball cage 41, and the sealing ring blocks the outside of the ball 42 to prevent the ball 42 from falling.

[0034] The plugging assembly 5 is detachably provided on the plugging connection assembly 4, and the dual-output hydraulic drive assembly 2 can drive the plugging assembly 5 to vertically and linearly reciprocate to adjust the position of the plugging assembly 5. The plugging assembly 5 includes a plugging plate 50, a sealing rubber ring 51 arranged on the circumference of the side wall of the plugging plate 50, a plurality of plate pins 52 slidably arranged on the top of the plugging plate 50, and a plugging joint 53 detachably installed on the top of the plugging plate 50. An oblique groove 54 adapted to the cylindrical pin 43 is provided on the plate pin 52. When the plugging connection assembly 4 is connected to the plugging assembly 5, the cylindrical pin 43 is located in the oblique groove 54. The operating wrench rod 7 rotates the inner driving rod 3, and the plate pin 52 is extended or retracted outward through the cylindrical pin 43 and the oblique groove 54, so as to realize the card connection or separation with the card slot of the flange seat.

[0035] The blocking plate 50 is annular in shape as a whole, and an annular groove is provided on the blocking plate 50, and a sealing rubber ring 51 is installed in the annular groove. The sealing rubber ring 51 seals the contact position between the blocking plate 50 and the flange seat. In one embodiment, four plate pins 52 are provided, and the four plate pins 52 are arranged along the circumference of the blocking plate 50. The inner and outer sides of the plate pins 52 both have arc portions, and the outer arc portion contacts the groove of the flange seat, and the inner arc portion contacts the limit block 55. A central threaded hole is provided on the top of the blocking plate 50, and the limit block 55 can be detachably installed on the top of the blocking plate 50 through the central threaded hole and bolts. The limit block 55 is used to limit the displacement of the plate pin 52 to improve the reliability and stability of the connection. A plurality of slide grooves 56 are provided on the plate pin 52, and threaded holes with the same position and number as the slide grooves are provided on the blocking plate 50. Fastening screws 57 are detachably installed on the threaded holes, and the fastening screws 57 pass through the slide grooves 56. In this embodiment, three slide grooves 56 are provided on each plate pin 52, and the slide grooves 56 are waist-shaped holes. In a preferred embodiment, a bushing 58 is sleeved on the fastening screw 57, and the bushing 58 is slidably provided in the slide groove 56. The provision of the bushing 58 can facilitate the position adjustment of the plate pin 52. A positioning cone surface is provided on the outer wall of the blocking plate 50, and the positioning cone surface can facilitate centering during installation, adapt to a certain amount of installation error, and improve installation efficiency.

[0036] A clamping control assembly 6 is fixedly installed on the other output end of the dual-output hydraulic drive assembly, and the clamping control assembly 6 is used to drive the inner drive rod 3 to perform vertical displacement relative to the dual-output hydraulic drive assembly 2. In one embodiment, the clamping control assembly 6 includes a locking nut 60 fixedly installed on the output end of the dual-output hydraulic drive assembly 2 by bolts, a retaining ring 61 fixedly installed on the inner drive rod 3, a locking screw 62 arranged on the outside of the retaining ring 61 by friction, and a locking knob 63 fixedly installed on the locking screw 62 by bolts, the locking screw 62 is connected to the locking nut 60 by threads, and the locking knob 63 is rotated to make the locking screw 62 and the locking nut 60 rotate relative to each other (the operation can be assisted by fixing the wrench rod 7), thereby making the inner drive rod 3 perform vertical displacement relative to the dual-output hydraulic drive assembly 2. A second mark is provided on the locking nut 60. Specifically, the second mark is alternately arranged red and green stickers. An identification hole is provided on the locking knob 63. The operator can observe the second mark through the identification hole. When operating, the locking knob 63 is rotated, and the connection state of the blocking component 5 and the blocking connection component 4 is judged according to the difference of the second mark observed through the identification hole. In this embodiment, the second mark is an upper circle of green and a lower circle of red stickers or spray paints provided on the locking nut 60. When the device is in construction, the inner driving rod 3 is lowered, that is, the annular groove 44 is offset downward from the ball 42. At this time, the blocking joint 53 in the blocking component 5 and the ball cage 42 in the blocking connection component 4 are in a connected state through the ball 42, and the color is red when observed through the identification hole on the locking knob 63; when the device is sealed, the inner driving rod 3 is raised, that is, the annular groove 44 is aligned downward with the round through hole on the ball cage 41 for installing the ball 42, and the color of the locking knob 63 is green when observed. At this time, the blocking component 5 and the blocking connection component 4 are in a separated state, that is, when the ball cage 41 is lifted upward, the ball 42 retracts into the round through hole and the annular groove 44, and the two can be separated. In another embodiment, an adjusting bolt may be used instead of the clamping control assembly 6 to adjust the vertical displacement of the inner drive rod 3 relative to the dual-output hydraulic drive assembly 2, that is, an adjusting bolt is provided at the top of the inner drive rod 3 and penetrates through the wrench block 8, and the pin slot hole for fixing the wrench block 8 and the inner drive rod 3 is set as a waist-shaped hole, and the vertical displacement of the inner drive rod 3 relative to the dual-output hydraulic drive assembly 2 is adjusted by the adjusting bolt.

[0037] In one embodiment, a first marking ring 9 is fixedly installed on the top of the card-joined control assembly 6, and a first mark is set on the first marking ring 9. Specifically, the first mark is a red and green color painted on the outer circumferential surface of the lower half of the wrench block 8. The color is observed through the notch on the first marking ring 9. When the notch observes the color as green, the plate pin 52 on the plugging assembly 5 is inserted into the slot of the flange seat. When the notch observes the color as red, the plate pin 52 on the plugging assembly 5 is not inserted into the slot of the flange seat. The operator can intuitively see whether the plugging assembly 5 is successfully connected to the flange seat. One end of the inner drive rod 3 passes through the first marking ring 9 and the locking knob 63. A wrench block 8 is fixedly installed on the top of the inner drive rod 3 through a pin shaft, and a wrench rod 7 passes through the wrench block 8. The wrench rod 7 is vertically arranged with the inner drive rod 3, which is convenient for the operator to twist and apply force. When the wrench rod 7 drives the inner driving rod 3 to rotate, the wrench block 8 rotates relative to the first marking ring 9. By observing the relative positions of the colors on the wrench block 8, the position of the plate pin 52 can be intuitively understood, and then it can be determined whether the plate pin 52 is clamped on the flange seat.

[0038] When performing the lower plugging operation, first connect the plugging assembly 5 to the plugging connection assembly 4, then fix the lower plugging adapter 1 to the flange seat by bolts, and after the connection is completed, lower the plugging assembly 5 to a specified distance through the dual-output hydraulic drive assembly 2, so that the plugging plate 50 contacts the flange seat, rotate the wrench rod 7 to make the cylindrical pin 43 snap into the inclined groove 54, and continue to rotate the wrench rod 7 to make the plate pin 52 extend into the slot of the flange seat. After it is in place, observe through the mouth of the first marking ring 9 that the color of the first mark is green. After being snapped in place, lift it through the dual-output hydraulic drive assembly 2. If it does not move when lifted, it proves that the plugging assembly 5 has completed the plugging of the flange seat. Remove the connecting bolts between the lower plugging adapter 1 and the flange seat, turn the locking knob 63 so that the annular groove 44 is offset downward from the ball 42, lift the device to separate the plugging assembly 5 from the plugging connection assembly 4, remove the connecting bolts between the lower plugging adapter 1 and the flange seat, and then remove the plugging joint 53 separately, install the limit block 55 and the blind plate, complete the overall lower plugging operation, and repeat the above steps to continue the plugging operation.

[0039] The above embodiments are only some descriptions of the concept and implementation of the utility model, and are not intended to limit the concept and implementation of the utility model. Under the concept of the utility model, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A metal pipe plugging device, comprising a plugging adapter, characterized in that: A dual-output hydraulic drive assembly is detachably mounted on the lower plugging adapter, an inner drive rod is movably arranged in the dual-output hydraulic drive assembly, a plugging connection assembly is arranged on an output end of the dual-output hydraulic drive assembly located in the lower plugging adapter, a plugging assembly is detachably arranged on the plugging connection assembly, the dual-output hydraulic drive assembly can drive the plugging assembly to perform vertical linear reciprocating motion to adjust the position of the plugging assembly; a snap-on control assembly is fixedly mounted on the other output end of the dual-output hydraulic drive assembly, the snap-on control assembly is used to drive the inner drive rod to perform vertical displacement relative to the dual-output hydraulic drive assembly; the plugging assembly is lowered into the flange seat for plugging through the dual-output hydraulic drive assembly and the plugging connection assembly.

2. The metal pipe plugging device according to claim 1, characterized in that: The blocking assembly comprises a blocking plate, a sealing rubber ring arranged on the circumference of the side wall of the blocking plate, a plurality of plate pins slidably arranged on the top of the blocking plate, and a blocking joint detachably installed on the top of the blocking plate.

3. The metal pipe plugging device according to claim 2 is characterized in that: The blocking connection component includes a pin seat fixedly connected to the inner driving rod, a ball cage fixedly installed on the output end of the dual-output hydraulic driving component, a plurality of balls movably arranged on the ball cage and a plurality of cylindrical pins elastically installed on the bottom of the pin seat; an annular groove for accommodating the balls is arranged on the pin seat; the blocking joint is connected to the ball cage by the ball clamping; the position of the annular groove relative to the balls is controlled by the clamping control component to realize the detachable connection between the blocking connection component and the blocking component; an oblique groove adapted to the cylindrical pin is arranged on the plate pin; when the blocking connection component is connected to the blocking component, the cylindrical pin is located in the oblique groove; the wrench rod is operated to rotate the inner driving rod, so that the plate pin is extended outward or retracted through the cylindrical pin and the oblique groove.

4. The metal pipe plugging device according to claim 1 or 3, characterized in that: The dual-output hydraulic drive assembly includes a cylinder, a piston rod installed on the cylinder with a sliding seal, and an oil inlet and an oil outlet fixedly arranged on the cylinder. The piston rod is a hollow structure, and the inner drive rod passes through the inner cavity of the piston rod. Both ends of the inner drive rod are located outside the two ends of the piston rod.

5. The metal pipe plugging device according to claim 1 or 2, characterized in that: The lower plugging adapter includes a lower flange, a cylinder fixedly arranged on the top of the lower flange, and an upper cover fixedly arranged on the top of the cylinder, and sealing rings are arranged between the upper cover and the cylinder and between the lower flange and the cylinder; one end of the dual-output hydraulic drive assembly is installed on the upper cover.

6. The metal pipe plugging device according to claim 3 is characterized in that: A wrench rod and a wrench block are mounted on the top end of the inner driving rod, and the wrench rod passes through the wrench block.

7. The metal pipe plugging device according to claim 6, characterized in that: The clamping control assembly includes a locking nut fixedly mounted on the output end of the dual-output hydraulic drive assembly, a retaining ring fixedly mounted on the inner drive rod, a locking screw arranged on the outside of the retaining ring by friction, and a locking knob fixedly mounted on the locking screw. The locking screw is connected to the locking nut by a thread, and rotating the locking knob causes the inner drive rod to vertically displace relative to the dual-output hydraulic drive assembly.

8. The metal pipe plugging device according to claim 7, characterized in that: A first marking ring is fixedly installed on the top of the clamping control assembly, and a first mark is provided on the wrench block; one end of the inner driving rod passes through the first marking ring and the locking knob; when the wrench rod drives the inner driving rod to rotate, the wrench block rotates relative to the first marking ring, and the position of the plate pin can be intuitively understood by observing the relative position between the first mark on the wrench block and the first marking ring.

9. The metal pipe plugging device according to claim 8, characterized in that: A second mark is provided on the locking nut, and an identification hole is provided on the locking knob, through which the second mark can be observed; during operation, the locking knob is rotated, and the connection status of the blocking component and the blocking connection component is judged according to the difference in the second mark observed through the identification hole.

10. The metal pipe plugging device according to claim 2 or 3, characterized in that: A plurality of slide grooves are arranged on the plate pin, and threaded holes whose positions and quantities match those of the slide grooves are arranged on the blocking plate. Fastening screws are detachably mounted on the threaded holes, and the fastening screws pass through the slide grooves. A bushing is sleeved on the fastening screw, and the bushing is slidably arranged in the slide groove.

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