Plugging device under pressure

Abstract

The invention relates to the field of pipeline under-pressure plugging, in particular to an under-pressure plugging device, and a plugging head of the under-pressure plugging device comprises a connecting mechanism arranged at the moving end of a feeding mechanism; the oil cylinder is rotationally arranged at the bottom of the connecting mechanism, the maximum overturning angle of the oil cylinder is smaller than 90 degrees, and the oil cylinder is horizontal after being overturned by the maximum angle; the fixed connecting disc is arranged on the oil cylinder, and a telescopic rod of the oil cylinder penetrates through the fixed connecting disc; the movable connecting disc is arranged at the end part of a telescopic rod of the oil cylinder; the plugging rubber mat is arranged on the end face, facing the movable connecting disc, of the fixed connecting disc, and the outer diameter of the plugging rubber mat in the natural state is smaller than the inner diameter of the pipeline. According to the pipeline plugging device, due to the fact that the outer diameter of the plugging rubber mat in the natural state is smaller than the inner diameter of the pipeline, the plugging rubber mat can smoothly move in the pipeline without damaging the pipeline, after the plugging rubber mat is in place, the plugging rubber mat is extruded through contraction of the oil cylinder to complete effective plugging, and the plugging effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline pressure sealing, in particular to a pressure sealing device. BACKGROUND

[0002] The pipeline pressure sealing device separates the part of the pipeline that needs to be repaired by the sealing element, and various operations such as maintenance or partial replacement are performed on the pipeline without affecting the internal medium of the pipeline. This method avoids the cost and time loss caused by traditional shutdown maintenance.

[0003] Chinese patent CN104180122B discloses a plug type sealing plug for pressure oil and gas pipeline. The inner peripheral surface of the sealing plug fixing cylinder is connected with a support plate, the support plate is provided with a pin shaft corresponding to the vertical notch of the fixing cylinder, two rocker arms are symmetrically connected at both ends of the pin shaft through end shaft holes, the tail end of each rocker arm is connected with a circular plate provided with a rubber sealing ring, the circular plate is connected with a circular pressing plate provided with a rubber sealing ring, and the circular pressing plate is connected with a vertical guide plate provided with large and small guide wheels. According to the radial piston sealing principle, the sealing plug can press the rubber sealing ring into the pressure oil and gas pipeline with a pressure of 10 MPa or above, effectively seal the pipeline, avoid the complex operation and expensive cost of pipeline pressure reduction and interruption, and realize safe temporary interruption under the condition that the pipeline does not stop conveying, thereby providing a beneficial means for pipeline emergency repair.

[0004] However, the above-mentioned disclosed scheme has the following disadvantages: the rubber sealing ring and the pipeline are in interference fit, the sealing plug is difficult to enter and exit the pipeline smoothly and freely, and the sealing process is prone to be not tight or the pipeline is broken. SUMMARY

[0005] The present application aims to solve the problem of interference fit between the rubber sealing ring and the pipeline in the background art, which is prone to cause sealing not to be tight or the pipeline to be broken during the sealing process, and proposes a pressure sealing device.

[0006] The technical scheme of the present application: a pressure sealing device, comprising a pipeline and a feeding mechanism arranged on the pipeline, the pipeline is provided with an operation hole, the bottom of the feeding mechanism is provided with a sealing plug, the sealing plug is turned over after passing through the operation hole to seal the pipeline; the sealing plug comprises:

[0007] A connecting mechanism is arranged at the moving end of the feeding mechanism.

[0008] An oil cylinder is rotatably arranged at the bottom of the connecting mechanism, the maximum turning angle of the oil cylinder is less than ninety degrees, and the oil cylinder is in a horizontal state after turning to the maximum angle.

[0009] A fixed connecting disc is arranged on the oil cylinder, and the telescopic rod of the oil cylinder passes through the fixed connecting disc.

[0010] The movable connecting disc is arranged at the end of the telescopic rod of the oil cylinder;

[0011] The sealing rubber pad is arranged on the end face of the fixed connecting disc facing the movable connecting disc, and the outer diameter of the sealing rubber pad in the natural state is smaller than the inner diameter of the pipeline.

[0012] Preferably, the feeding mechanism comprises a mounting assembly arranged on the pipeline and a feeding assembly arranged on the mounting assembly.

[0013] Preferably, the mounting assembly comprises a gate valve pipe saddle arranged on the pipeline, a gate valve arranged on the gate valve pipe saddle, and a sealing box arranged on the gate valve.

[0014] Preferably, an oil cylinder nozzle is arranged on the oil cylinder, an oil pipe is arranged on the sealing box, and the oil pipe and the oil cylinder nozzle are communicated through a hose.

[0015] Preferably, the feeding assembly comprises a main machine arranged on the sealing box, a feeding screw rod rotatably arranged on the main machine, and a main shaft slidably arranged in the main machine in the vertical direction, the bottom of the main shaft is connected with the sealing head, and a threaded hole matched with the feeding screw rod is arranged on the main shaft.

[0016] Preferably, a main shaft moving limiting sleeve is arranged at the bottom of the main machine, the inner hole of the main shaft moving limiting sleeve is non-circular, and the cross-sectional shape of one section of the main shaft is matched with the shape of the inner hole of the main shaft moving limiting sleeve.

[0017] Preferably, the connecting mechanism comprises a main plate, a guard plate arranged on both sides of the main plate, and a connecting sleeve arranged on the main plate, the connecting sleeve is connected with the moving end of the feeding mechanism, the end of the oil cylinder is rotatably connected with the bottom of the main plate, the bottom of the main plate is a main plate limiting side wall, a stopper is arranged on the right side of the bottom of the main plate limiting side wall, the oil cylinder is attached to the main plate limiting side wall after being turned to the maximum angle, and the oil cylinder is stopped by the stopper after being reversely turned to the maximum angle.

[0018] Preferably, a guide wheel arm is arranged on the end face of the movable connecting disc away from the fixed connecting disc, and a guide wheel is rotatably arranged on the guide wheel arm.

[0019] Compared with the prior art, the present application has the following beneficial technical effects: since the outer diameter of the sealing rubber pad in the natural state is smaller than the inner diameter of the pipeline, the sealing rubber pad can move smoothly in the pipeline without damaging the pipeline, and will not burst the pipeline, the effective sealing is completed by the contraction of the oil cylinder to extrude the sealing rubber pad after the sealing rubber pad is in place, and the extrusion of the sealing rubber pad can better adapt to the uneven inner wall of the pipeline, and the sealing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic diagram of one embodiment of the present application;

[0021] Figure 2It is a structural schematic view of the gate valve pipe saddle;

[0022] Figure 3 It is a structural schematic view of the main shaft movement limiting sleeve;

[0023] Figure 4 It is a structural schematic view of the plugging box;

[0024] Figure 5 It is a structural schematic view of the main shaft and the connecting sleeve;

[0025] Figure 6 It is a structural schematic view of the plugging head in the sealed state;

[0026] Figure 7 It is a structural schematic view of the plugging head in the non-sealed state;

[0027] Figure 8 It is a structural schematic view of the main plate and the guard plate.

[0028] Reference signs: 1, pipeline; 2, gate valve pipe saddle; 3, gate valve; 4, plugging box; 5, connecting sleeve; 6, main machine; 7, feeding screw rod; 8, main shaft; 9, bearing; 10, main shaft movement limiting sleeve; 11, threaded hole; 12, main plate; 13, stop block; 14, positioning jack; 15, guard plate; 16, plug-in block; 17, oil cylinder; 18, fixed connecting disc; 19, movable connecting disc; 20, plugging rubber pad; 21, main plate limiting side wall; 22, guide wheel arm; 23, guide wheel; 24, connecting rod; 25, oil cylinder nozzle; 26, oil pipe; 27, connecting hole. DETAILED DESCRIPTION

[0029] Example one

[0030] As Figures 1-6 shown, the application provides a pressure plugging device, which comprises a pipeline 1 and a feeding mechanism arranged on the pipeline 1, the pipeline 1 is provided with an operation hole, the feeding mechanism is provided with a plugging head at the bottom, the plugging head is turned over after passing through the operation hole to plug the pipeline 1; the plugging head comprises:

[0031] a connecting mechanism arranged at the moving end of the feeding mechanism;

[0032] an oil cylinder 17 rotatably arranged at the bottom of the connecting mechanism, the maximum turning angle of the oil cylinder 17 is less than ninety degrees, and the oil cylinder 17 is in a horizontal state after turning to the maximum angle;

[0033] a fixed connecting disc 18 arranged on the oil cylinder 17, and the telescopic rod of the oil cylinder 17 passes through the fixed connecting disc 18;

[0034] The movable connecting disc 19 is arranged at the telescopic rod end of the oil cylinder 17. A guide wheel arm 22 is arranged on the end face of the movable connecting disc 19 away from the fixed connecting disc 18. A guide wheel 23 is rotatably arranged on the guide wheel arm 22. The guide wheel 23 first contacts the inner wall of the bottom of the pipeline 1, then moves with small resistance and drives the oil cylinder 17 to overturn, so that the oil cylinder 17 is smoothly brought into a horizontal state.

[0035] The sealing rubber pad 20 is arranged on the end face of the fixed connecting disc 18 facing the movable connecting disc 19. The outer diameter of the sealing rubber pad 20 in a natural state is smaller than the inner diameter of the pipeline 1. After the oil cylinder 17 is retracted, the sealing rubber pad 20 is extruded by the movable connecting disc 19 to tightly adhere to the inner wall of the pipeline 1 to achieve sealing. Specifically, the outer diameter of the sealing rubber pad 20 in a natural state is three centimeters smaller than the inner diameter of the pipeline 1, and the sealing rubber pad 20 can freely enter and exit the pipeline.

[0036] Example two

[0037] As shown in Figure 1 , Figure 6 and Figure 7 , the present application proposes a sealing device under pressure. Compared with example one, the present embodiment details the structure of the feeding mechanism.

[0038] The feeding mechanism includes a mounting assembly arranged on the pipeline 1 and a feeding assembly arranged on the mounting assembly.

[0039] The mounting assembly includes a gate valve pipe saddle 2 arranged on the pipeline 1, a gate valve 3 arranged on the gate valve pipe saddle 2, and a sealing box 4 arranged on the gate valve 3. In an optional embodiment, the gate valve pipe saddle 2 and the gate valve 3 are connected by a flange, and the gate valve 3 and the sealing box 4 are also connected by a flange. An oil cylinder nozzle 25 is arranged on the oil cylinder 17, and an oil pipe 26 is arranged on the sealing box 4. The front end of the oil pipe is connected to an adapter, which is located on the outer arm hole of the pipeline. The oil pipe 26 and the oil cylinder nozzle 25 are connected to the internal end of the adapter through a wave-shaped hose, so as to have a certain elastic force when the sealing head advances. The oil pipe 26 is connected to an oil pipe to connect a hydraulic device to drive the telescoping of the oil cylinder 17. The oil pipe 26 and the hose, and the oil cylinder nozzle 25 and the hose are connected through the adapter, and the adapter is connected in a conventional threaded connection mode.

[0040] The feed assembly includes a main machine 6 arranged on the sealing box 4, a feed screw 7 rotatably arranged on the main machine 6, and a main shaft 8 slidably arranged in the main machine 6 along the vertical direction, the bottom of the main shaft 8 is connected to the sealing head, and the main shaft 8 is provided with a threaded hole 11 that cooperates with the feed screw 7; specifically, the main machine 6 is cylindrical, and its bottom and the sealing box 4 are connected by a flange. The feed screw 7 passes through the top of the main machine 6, and the two are sealed and rotatably connected by two bearings 9. The outer end of the feed screw 7 is connected to a power mechanism, such as an output mechanism composed of a motor and a reducer, thereby driving the feed screw 7 to rotate, and the bottom part of the feed screw 7 is inserted into the threaded hole 11, and the main shaft 8 is driven up or down by the rotation of the feed screw 7. A spindle movement limit sleeve 10 is provided at the bottom of the main machine 6. The inner hole of the spindle movement limit sleeve 10 is non-circular. The cross-sectional shape of a section on the spindle 8 matches the inner hole shape of the spindle movement limit sleeve 10, so that the spindle 8 moves up and down without rotating with the feed screw 7; in this embodiment, the inner hole shape of the spindle movement limit sleeve 10 is a circle with a notch.

[0041] Example 3

[0042] like Figures 6-8 As shown, the present invention proposes a pressure sealing device. Compared with the first or second embodiment, this embodiment introduces the structure of the connecting mechanism in detail.

[0043] The connecting mechanism includes a main board 12, guard plates 15 arranged on both sides of the main board 12, and a connecting sleeve 5 arranged on the main board 12. The connecting sleeve 5 is connected to the moving end of the feed mechanism, that is, connected to the bottom of the main shaft 8. The end of the cylinder 17 is rotatably connected to the bottom of the main board 12. The bottom of the main board 12 is the main board limiting side wall 21. A stopper 13 is set on the right side of the bottom of the main board limiting side wall. Specifically, a connecting rod 24 is set at the end of the cylinder 17, a connecting hole 27 is set on the stopper 13, and a rotating shaft is set on the connecting rod 24. The rotating shaft fits in the connecting hole 27 After the oil cylinder 17 rotates and flips to the maximum angle, it sticks to the limiting side wall 21 of the main board. After the oil cylinder 17 flips in the opposite direction to the maximum angle, it is blocked by the block 13. In an optional embodiment, four positioning holes 14 are provided on the main board 12, and two plug-in blocks 16 are provided on each of the two guard plates 15. The plug-in blocks 16 are inserted into the positioning holes 14, and then the guard plates 15 and the main board 12 are welded and fixed. The main board 12 and the two guard plates 15 form a cross-shaped structure, and the movement guidance is realized in the sealing box 4 through the main board 12 and the two guard plates 15.

[0044] In conclusion, when the main shaft 8 moves forward, the connecting sleeve 5 pushes the whole sealing head to move forward, the guide wheel 23 first contacts the inner wall of the bottom of the pipeline 1, the oil cylinder 17 starts to gradually overturn, finally the oil cylinder 17 overturns to the horizontal state and contacts the limiting side wall 21 of the main plate, at this time the sealing rubber pad 20 is in the vertical state, and the axis is coincident with the axis of the pipeline 1, then the telescopic rod of the oil cylinder 17 is retracted, the sealing rubber pad 20 is extruded by the movable connecting disc 19 to expand outward so as to be tightly attached to the inner wall of the pipeline 1 to complete the sealing. Since the outer diameter of the sealing rubber pad 20 in the natural state is smaller than the inner diameter of the pipeline 1, the sealing rubber pad 20 can move smoothly in the pipeline 1, and will not damage the pipeline 1, and will not break the pipeline 1, after the sealing rubber pad 20 is in place, the effective sealing is completed by extruding the sealing rubber pad 20 to expand outward through the retraction of the oil cylinder 17, and the extrusion of the sealing rubber pad 20 can better adapt to the uneven inner wall of the pipeline 1, and the sealing effect is better.

[0045] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A pressure plugging device, comprising a pipeline (1) and a feeding mechanism arranged on the pipeline (1), wherein an operation hole is provided on the pipeline (1), and a plugging head is provided at the bottom of the feeding mechanism, and the plugging head passes through the operation hole and is turned over to plug the pipeline (1); characterized in that: The plugging head includes: A connecting mechanism, provided at the moving end of the feeding mechanism; The oil cylinder (17) is rotatably arranged at the bottom of the connecting mechanism, and the maximum turning angle of the oil cylinder (17) is less than 90 degrees. After the oil cylinder (17) turns to the maximum angle, it becomes horizontal; A fixed connecting plate (18) is arranged on the oil cylinder (17), and a telescopic rod of the oil cylinder (17) passes through the fixed connecting plate (18); A movable connecting plate (19) is arranged at the end of the telescopic rod of the oil cylinder (17); A sealing rubber pad (20) is provided on the end surface of the fixed connection disk (18) facing the movable connection disk (19); the outer diameter of the sealing rubber pad (20) is smaller than the inner diameter of the pipe (1) in a natural state; after the oil cylinder (17) contracts, the sealing rubber pad (20) is squeezed through the movable connection disk (19) so that the sealing rubber pad (20) is closely attached to the inner wall of the pipe (1) to achieve sealing.

2. The pressure plugging device according to claim 1, characterized in that: The feeding mechanism comprises a mounting assembly arranged on the pipeline (1) and a feeding assembly arranged on the mounting assembly.

3. The pressure plugging device according to claim 2, characterized in that: The installation assembly comprises a gate valve saddle (2) arranged on a pipeline (1), a gate valve (3) arranged on the gate valve saddle (2), and a sealing box (4) arranged on the gate valve (3).

4. The pressure plugging device according to claim 3, characterized in that: The oil cylinder (17) is provided with an oil cylinder mouth (25), the plugging box (4) is provided with an oil pipe (26), and the oil pipe (26) and the oil cylinder mouth (25) are communicated with each other through a hose.

5. The pressure plugging device according to claim 3, characterized in that: The feeding assembly comprises a main machine (6) arranged on a blocking box (4), a feeding screw (7) rotatably arranged on the main machine (6), and a main shaft (8) slidably arranged in the main machine (6) along a vertical direction, wherein the bottom of the main shaft (8) is connected to the blocking head, and a threaded hole (11) is provided on the main shaft (8) to cooperate with the feeding screw (7).

6. The pressure plugging device according to claim 5, characterized in that: A main shaft movement limiting sleeve (10) is provided at the bottom of the main machine (6); the inner hole of the main shaft movement limiting sleeve (10) is non-circular; and the cross-sectional shape of one section on the main shaft (8) matches the inner hole shape of the main shaft movement limiting sleeve (10).

7. The pressure plugging device according to claim 1, characterized in that: The connecting mechanism comprises a main board (12), guard plates (15) arranged on both sides of the main board (12), and a connecting sleeve (5) arranged on the main board (12); the connecting sleeve (5) is connected to the moving end of the feeding mechanism; the end of the oil cylinder (17) is rotatably connected to the bottom of the main board (12); the bottom of the main board (12) is a main board limiting side wall (21); a stopper (13) is arranged on the right side of the bottom of the main board limiting side wall; the oil cylinder (17) is attached to the main board limiting side wall (21) after being turned to a maximum angle; and is stopped by the stopper (13) after being turned in the opposite direction to the maximum angle.

8. The pressure plugging device according to claim 1, characterized in that: A guide wheel arm (22) is arranged on the end surface of the movable connecting disk (19) facing away from the fixed connecting disk (18), and a guide wheel (23) is rotatably arranged on the guide wheel arm (22).

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