Temporary cut-off device for pipeline

Abstract

The invention relates to a temporary pipeline cut-off device, which belongs to the technical field of thermal power generation and comprises a holder, the holder comprises a pair of holding rods arranged in parallel at intervals, two sections of threaded rods are arranged on the holding rods at intervals, and the threaded rods and the holding rods are integrally arranged; an upper cover plate, an upper blocking plate, a lower blocking plate and a base plate are sequentially arranged between the two retaining rods from top to bottom, two symmetrically-arranged moving grooves are formed in each of the upper cover plate, the upper blocking plate, the lower blocking plate and the base plate, and the retaining rods sequentially and movably penetrate through the moving grooves from top to bottom. The top end of the upper cover plate is provided with a pressing nut which is arranged on the threaded rod located at the upper end of the retaining rod in a threaded sleeving mode, the bottom end of the base plate is provided with a jacking nut which is arranged on the threaded rod located at the lower end of the retaining rod in a threaded sleeving mode, and a lifting device used for jacking the lower blocking plate is further arranged between the lower blocking plate and the base plate. According to the device, under the condition that leakage occurs in front of a primary door, a pipeline can be temporarily cut off, defects are eliminated, and stable operation of a unit is guaranteed.

Description

Technical Field

[0001] The invention relates to a temporary pipeline cutting device, belonging to the technical field of thermal power generation. Background Art

[0002] In thermal power plants, a large number of instrument pipelines are made of stainless steel pipes of DN10 and below, and there are a large number of measuring points for measuring pressure, temperature, etc. in pipelines and equipment. To ensure safety, primary and secondary doors are designed in tributary pipelines as cut-off isolation. However, due to the quality of installation welding process, long-term operation of units, overpressure of pipelines and equipment, etc., the welds of instrument pipelines, primary and secondary doors are prone to leakage. If the weld in front of the primary door of the tributary pipeline leaks, it will greatly endanger the stable operation of the unit.

[0003] At present, when a leak occurs in a primary front weld of a branch pipeline, it is usually necessary to temporarily shut down the entire unit and then repair the leaking position with welding, which not only takes a long time but also greatly affects the normal operation of the unit.

[0004] A Chinese utility model patent with publication number CN217356107U discloses a leak-proof device for pipeline sand holes, corrosion and welding defect leakage, including a welding plate, a through hole is penetrated on the welding plate and connected with the leakage point of the pipeline, a connecting pipe is fixedly arranged on the welding plate, one end of the connecting pipe is connected with the through hole, and a flange is arranged at the other end, and a valve body is arranged at the tail end of the flange.

[0005] When the above reference example is used, if the leakage port is not at the lower end, it is difficult to completely block the leaked fluid only by welding the plate, connecting pipe, flange and valve body, and the use effect is poor. Summary of the invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention designs a temporary pipeline cut-off device, which can temporarily limit the flow at the front end of the pipeline leakage point, thereby facilitating maintenance personnel to repair and weld the leaking part of the pipeline. Finally, after the unit is shut down normally, the cut-off part of the pipeline can be cut and reconnected, so that the unit will not stop running due to leakage in the branch pipeline.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A temporary pipeline cutting device comprises a retaining frame, wherein the retaining frame comprises a pair of retaining rods arranged in parallel and spaced apart, two sections of threaded rods are arranged on the retaining rods at intervals, and the threaded rods are integrally arranged with the retaining rods;

[0009] An upper cover plate, an upper blocking plate, a lower blocking plate and a pad are arranged in sequence from top to bottom between the two retaining rods, and two symmetrically arranged movable grooves are provided on the upper cover plate, the upper blocking plate, the lower blocking plate and the pad. The retaining rod moves through each movable groove in sequence from top to bottom. A clamping nut threadedly mounted on a threaded rod at the upper end of the retaining rod is arranged at the top of the upper cover plate, and a locking nut threadedly mounted on a threaded rod at the lower end of the retaining rod is arranged at the bottom of the pad. A lifting device for lifting the lower blocking plate is also arranged between the lower blocking plate and the pad.

[0010] Furthermore, a lower cover plate movably mounted between two retaining rods is provided between the tightening nut and the backing plate.

[0011] Furthermore, a top plate is arranged at the top of the lifting device, and the top plate is arranged in contact with the bottom end of the lower blocking plate.

[0012] Furthermore, a clamping mechanism for clamping the retaining rods is disposed at the bottom ends of the two retaining rods, and a transverse movement mechanism for driving the two clamping mechanisms to move along the length direction of the movable groove is disposed at the bottom ends of the clamping mechanisms.

[0013] Furthermore, the transverse movement mechanism comprises a bottom plate, and two moving units are arranged on the top of the bottom plate, and the moving units comprise a plurality of parallel and spaced slide rails and a mounting plate slidably connected to each of the slide rails;

[0014] A swing rod hingedly mounted on the top of the bottom plate is provided at the middle position between the two moving units, push-pull rods are hingedly mounted at both ends of the swing rod, and the free ends of the two push-pull rods are hingedly mounted to the middle of the two mounting plates respectively;

[0015] An extension plate is integrally extended from the side of the bottom plate, a telescopic driving mechanism is installed on the top of the extension plate, and the telescopic driving mechanism is transmission-connected with a telescopic rod for driving one of the mounting plates to reciprocate along the slide rail.

[0016] Further, the clamping mechanism comprises a supporting ring plate fixedly mounted on the top of the mounting plate, an annular supporting block is rotatably mounted on the top of the supporting ring plate, and a fixing ring is fixed at intervals on the top of the annular supporting block;

[0017] The top of the support ring plate is also provided with at least three clamping units arranged in a circumferential array, and the clamping unit includes a hinge column fixedly installed on the top of the support ring plate, a transmission rod with one end hinged to the top of the hinge column and the other end rotatably connected to a clamping wheel, and a sliding sleeve block slidably sleeved on the transmission rod, the arc surface of the clamping wheel is arranged in contact with the retaining rod, and the sliding sleeve block is hinged to the fixed ring;

[0018] The top end of the supporting ring plate is also provided with a driving unit for driving the annular supporting block to rotate.

[0019] Furthermore, the driving unit includes a support member, a driving motor and a screw rod transmission-connected to the driving motor, the support member includes a support column fixed at the top of a supporting ring plate, the top of the support column is hinged with a first hinge block, the side of the annular support block is integrally extended with an extension block, the top of the extension block is hinged with a second hinge block, one end of the screw rod rotates and passes through the first hinge block, and the other end of the screw rod is threadedly passed through the second hinge block.

[0020] Furthermore, the two mounting plates are fixedly connected with an L-shaped support rod at one end away from each other, and a limiting mechanism is provided at the free end of the support rod, and the limiting mechanism comprises a lower clamping block rotatably connected to the free end of the support rod and a quantitative limiting unit arranged at the top end of the lower clamping block, and a T-slot is provided at the top end of the lower clamping block, and the quantitative limiting unit comprises a vertical rod, an upper clamping block and an eccentric connecting plate, and the eccentric connecting plate is rotatably mounted on the end of the upper clamping block away from the retaining frame, and the eccentric connecting plate is a regular polygonal structure, and the bottom end of the vertical rod is movably clamped in the T-slot, and the top end of the vertical rod extends out of the T-slot and is movably connected to the upper clamping block, and an adjusting unit for driving the upper clamping block to move up and down along the length direction of the vertical rod is installed at the top end of the upper clamping block.

[0021] Furthermore, the adjustment unit includes a movable block and an adjustment nut both movably mounted on the vertical rod, and the adjustment nut is threadedly connected to the vertical rod, and the movable block is fixedly connected to the upper clamping block and rotationally connected to the bottom end of the adjustment nut.

[0022] Furthermore, a compression strip can be detachably installed at the same position of the bottom end of the upper blocking plate and the top end of the lower blocking plate; and a plurality of pairs of additional strips of different lengths can be detachably provided at the top end of the upper cover plate.

[0023] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0024] 1. The present invention, through the setting of the retaining frame, utilizes the lifting device to push the lower blocking plate close to the upper blocking plate to achieve the clamping and intercepting of the pipeline, so that it is convenient for maintenance personnel to repair and weld the leaking part downstream of the pipeline. It is convenient and quick to push through the lifting device. At the same time, through the setting of the tightening nut and the clamping nut, the pad plate and the upper cover plate can be well supported, so that the upper blocking plate and the lower upper blocking plate can stably clamp the pipeline, effectively improving the stability of the device during use. At the same time, through the setting of the threaded rod, the position of the tightening nut and the clamping nut can be adjusted, and then the position of the pad plate and the upper cover plate as well as the upper blocking plate and the lower upper blocking plate can be adjusted, so that the device can adapt to pipelines of different diameters, effectively improving the applicability of the device.

[0025] 2. The present invention can drive the movement of the clamping mechanism and the retaining rod by the transverse movement mechanism and the clamping mechanism. The distance between the two retaining rods can be adjusted laterally by adjusting the retaining rod, so as to adapt to the clamping and interception of pipes of different sizes. At the same time, the adjustable setting of the clamping unit can drive the transmission rod to swing by adjusting the position of the annular support block, so as to adjust the distance between the clamping wheels, so that the clamping mechanism can adapt to retaining rods of different thicknesses, further improving the applicability of the device.

[0026] 3. The present invention, through the setting of the limiting mechanism, can quantitatively adjust the spacing between the upper clamping block and the lower clamping block by adjusting the position of the eccentric connecting plate, and cooperate with the clamping function of the upper blocking plate and the lower upper blocking plate, so that the upper blocking plate and the lower upper blocking plate can clamp the pipeline more stably, not only can the pipeline be intercepted stably and effectively, but also can prevent the upper blocking plate and the lower upper blocking plate from separating due to failure of the lifting device, thereby realizing double clamping and effectively ensuring the stability of the device. At the same time, the upper blocking plate and the lower upper blocking plate can be limited by a quantitative distance, so that the upper blocking plate and the lower upper blocking plate can always be maintained at a certain quantitative distance according to the placement posture of the eccentric connecting plate, so that the deformation state of the branch pipe can be kept uniform, so that the deformation of the pipeline will not affect the welding and leak repairing work at the downstream position, and the normal detection state of the measuring point at the downstream position of the pipeline can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a main structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the main structure of the cage of the present invention;

[0029] Figure 3 is a schematic diagram of the three-dimensional structure of the retaining frame of the present invention from a first viewing angle;

[0030] Figure 4 is a schematic diagram of the three-dimensional structure of the retaining frame of the present invention from a second viewing angle;

[0031] Figure 5 It is a three-dimensional structural schematic diagram of the transverse movement mechanism of the present invention;

[0032] Figure 6 is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention from a first viewing angle;

[0033] Figure 7 It is a schematic diagram of the top view of the clamping mechanism of the present invention;

[0034] Figure 8 is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention from a second viewing angle;

[0035] Fig. 9 It is a schematic diagram of the main structure of the limiting mechanism of the present invention;

[0036] Fig.10 It is a three-dimensional structural schematic diagram of the limiting mechanism of the present invention.

[0037] The accompanying drawings are marked as follows: 100, retaining frame; 200, transverse movement mechanism; 300, clamping mechanism; 400, limiting mechanism; 1, upper cover plate; 2, upper blocking plate; 3, lower blocking plate; 4, pad; 5, lower cover plate; 6, top nut; 7, clamping nut; 8, retaining rod; 9, threaded rod; 10, lifting device; 11, top plate; 12, clamping strip; 13, additional strip; 101, moving groove; 14, bottom plate; 15, slide rail; 16, mounting plate; 17, swing rod; 18, push-pull rod; 19, telescopic drive mechanism; 20. Telescopic rod; 21. Extension plate; 22. Support ring plate; 23. Drive motor; 24. Support column; 25. First hinge block; 26. Annular support block; 27. Extension block; 28. Second hinge block; 29. ​​Screw rod; 30. Articulated column; 31. Transmission rod; 32. Sliding sleeve block; 33. Clamping wheel; 34. Fixed ring; 35. Lower clamping block; 36. Support rod; 37. T-slot; 38. Block; 39. Vertical rod; 40. Upper clamping block; 41. Eccentric connecting plate; 42. Movable block; 43. Adjusting nut. DETAILED DESCRIPTION

[0038] The present invention is described in more detail below with reference to the embodiments.

[0039] Embodiment 1

[0040] See also Figure 1 The pipeline temporary cutting device of this embodiment includes a retaining frame 100, a transverse movement mechanism 200, a clamping mechanism 300 and a limiting mechanism 400.

[0041] Specifically, see Figure 2 , Figure 3 and Figure 4 The retaining frame 100 includes a pair of retaining rods 8 arranged in parallel and at intervals, and two sections of threaded rods 9 are arranged at intervals on the retaining rods 8. The threaded rods 9 are integrally arranged with the retaining rods 8.

[0042] An upper cover plate 1, an upper blocking plate 2, a lower blocking plate 3 and a pad 4 are sequentially arranged between the two retaining rods 8 from top to bottom. Two symmetrically arranged moving grooves 101 are provided on the upper cover plate 1, the upper blocking plate 2, the lower blocking plate 3 and the pad 4. The retaining rod 8 moves through each moving groove 101 in sequence from top to bottom. A clamping nut 7 threadedly sleeved on a threaded rod 9 located at the upper end of the retaining rod 8 is provided at the top of the upper cover plate 1. A tightening nut 6 threadedly sleeved on a threaded rod 9 located at the lower end of the retaining rod 8 is provided at the bottom of the pad 4. A lifting device 10 for lifting the lower blocking plate 3 is also provided between the lower blocking plate 3 and the pad 4.

[0043] In this embodiment, two clamping nuts 7 and two jacking nuts 6 are provided. The clamping nuts 7 are used to support the upper cover plate 1 , and the jacking nuts 6 are used to support the lower cover plate 5 .

[0044] In this embodiment, the lifting device 10 is a hydraulic lifting device.

[0045] Specifically, when the device is in use, a retaining rod 8 is set at the upstream position of the leakage branch pipe, and then the upper cover plate 1, the upper blocking plate 2, the lower blocking plate 3 and the pad 4 are installed, and the branch pipe is located between the upper blocking plate 2 and the lower blocking plate 3, and the clamping nut 7 and the top nut 6 are screwed to adjust the distance between the upper blocking plate 2 and the lower blocking plate 3 so that the distance between the upper blocking plate 2 and the lower blocking plate 3 is just the diameter of the branch pipe. Finally, the lifting device 10 is started to make the upper blocking plate 2 and the lower blocking plate 3 close to each other and clamp the branch pipe to cut off the flow until the leakage point at the downstream position of the branch pipe can be welded normally.

[0046] Furthermore, a lower cover plate 5 movably mounted between two retaining rods 8 is provided between the tightening nut 6 and the pad 4. Specifically, two symmetrically arranged movable grooves 101 are also provided on the lower cover plate 5, and the retaining rods 8 are arranged through the movable grooves 101. The lower cover plate 5 is arranged to support the pad 4, thereby further ensuring the stability of the device.

[0047] Furthermore, a top plate 11 is arranged at the top of the lifting device 10, and the top plate 11 is arranged in contact with the bottom end of the lower blocking plate 3. The arrangement of the top plate 11 can prevent the lifting end of the lifting device 10 from having a too small force bearing area and breaking the lower blocking plate 3, thereby effectively ensuring the stability of the lifting device 10 during lifting.

[0048] Furthermore, a clamping strip 12 can be detachably installed at the same position at the bottom end of the upper blocking plate 2 and the top end of the lower blocking plate 3. The setting of the clamping strip 12 can provide a force point for the branch pipe, thereby facilitating the clamping and deformation of the branch pipe.

[0049] At the same time, two pairs of additional strips 13 of different lengths are detachably provided on the top of the upper cover plate 1. The function of the additional strips 13 is the same as that of the clamping strips 12, both of which are to provide force points for the branch pipes. In addition, there are two pairs of additional strips 13 of different lengths, which can be adapted to branch pipes of different diameters and can be reasonably selected according to needs.

[0050] Specifically, each pair of additional strips 13 is provided with two strips, and the additional strips 13 are detachably connected to the upper cover plate 1 through a clamping groove and a clamping block.

[0051] Specifically, the clamping mechanism 300 is arranged at the bottom end of the retaining rod 8 for clamping the retaining rod 8, and a transverse movement mechanism 200 is arranged at the bottom end of the clamping mechanism 300 for driving the two clamping mechanisms 300 to move along the length direction of the movable groove 101. The transverse movement mechanism 200 drives the clamping mechanism 300 to move, and then can drive the retaining rod 8 to move, adjust the distance between the two retaining rods 8, and then adapt to the clamping of branch pipes of different diameters.

[0052] There are two limiting mechanisms 400, which are respectively arranged on both sides of the clamping mechanism 300. The limiting mechanisms 400 are used to clamp the upper blocking plate 2 and the lower blocking plate 3, and limit the upper blocking plate 2 and the lower blocking plate 3 after clamping the branch pipe.

[0053] From the above description, it can be seen that the beneficial effects of the present invention are: through the setting of the retaining frame 100, the lifting device 10 is used to push the lower blocking plate 3 close to the upper blocking plate 2 to achieve the clamping and interception of the branch pipe, which can facilitate the maintenance personnel to repair and weld the leaking part of the pipeline downstream. Through the promotion of the lifting device 10, it is convenient and fast, and can well achieve the interception effect of the branch pipeline. At the same time, through the setting of the tightening nut 6 and the clamping nut 7, the gasket 4 and the upper cover plate 1 can be well supported, so that the upper blocking plate 2 and the lower upper blocking plate 2 can stably clamp the pipeline, effectively improving the stability of the device during use. At the same time, through the setting of the threaded rod 9, the position of the tightening nut 6 and the clamping nut 7 can be adjusted, and then the position of the gasket 4 and the upper cover plate 1 as well as the upper blocking plate 2 and the lower upper blocking plate 2 can be adjusted, so that the device can adapt to pipelines of different diameters, effectively improving the applicability of the device.

[0054] Compared with the existing shutdown maintenance and the setting of welding plates, connecting pipes and valve bodies, this device can not only intercept the pipeline without stopping the unit, but also facilitate maintenance personnel to repair the leaking points without affecting the detection of measuring points at the downstream position of the tributary pipeline, so that the unit can continue to operate normally. Later, wait for the unit to shut down normally, and then cut the compressed and deformed pipeline and replace it with a new one.

[0055] Embodiment 2

[0056] The pipeline temporary cutting device of this embodiment is based on the above-mentioned embodiment 1, and the overall mechanical connection relationship between the traverse mechanism 200 and the clamping mechanism 300 is further defined as follows:

[0057] See also Figure 1 and Figure 5 The transverse movement mechanism 200 includes a base plate 14, and two moving units are arranged on the top of the base plate 14. The moving units include two parallel and spaced slide rails 15 and a mounting plate 16 that is slidably connected to each slide rail 15. The mounting plate 16 is slidably installed on the top of the slide rail 15, and the slide rails 15 of the two moving units are arranged in the same direction.

[0058] A swing rod 17 hingedly mounted on the top of the base plate 14 is provided in the middle position between the two moving units, and push-pull rods 18 are hinged at both ends of the swing rod 17. The free ends of the two push-pull rods 18 are respectively hinged to the middle of the two mounting plates 16, and an extension plate 21 is integrally extended from the side of the base plate 14. A telescopic driving mechanism 19 is installed on the top of the extension plate 21. The telescopic driving mechanism 19 is transmission-connected to a telescopic rod 20 for driving one of the mounting plates 16 to reciprocate along the slide rail 15.

[0059] In this embodiment, two clamping mechanisms 300 are respectively disposed on top of two mounting plates 16 .

[0060] Specifically, after the telescopic driving mechanism 19 is started, the telescopic rod 20 can be driven to telescope, and one of the mounting plates 16 can be driven to move along the slide rail 15 through the telescopic rod 20. When the mounting plate 16 moves, the other mounting plate 16 is driven to move through the push-pull rod 18, the swing rod 17 and the other push-pull rod 18 in sequence, thereby realizing the reciprocating motion of the two clamping mechanisms 300.

[0061] See also Figure 6 , Figure 7 and Figure 8 The clamping mechanism 300 includes a support ring plate 22 fixedly mounted on the top of the mounting plate 16, an annular support block 26 is rotatably mounted on the top of the support ring plate 22, a fixing ring 34 is fixed at intervals on the top of the annular support block 26, and a retaining rod 8 is arranged at the inner circle position of the support ring plate 22 and the annular support block 26.

[0062] Among them, three clamping units arranged in a circumferential array are also provided at the top of the support ring plate 22, and the clamping unit includes a hinge column 30 fixedly installed on the top of the support ring plate 22, a transmission rod 31 with one end hinged to the top of the hinge column 30 and the other end rotatably connected to a clamping wheel 33, and a sliding sleeve block 32 slidably sleeved on the transmission rod 31, the arc surface of the clamping wheel 33 is arranged in contact with the retaining rod 8, the sliding sleeve block 32 is hinged to the fixed ring 34, and a driving unit for driving the annular support block 26 to rotate is also provided at the top of the support ring plate 22.

[0063] Specifically, when the driving unit drives the annular support block 26 to rotate, the fixed ring 34 will also rotate synchronously. Since the sliding sleeve block 32 is hinged to the fixed ring 34, the fixed ring 34 will drive the sliding sleeve block 32 to move. When the sliding sleeve block 32 moves, the transmission rod 31 will be moved. Since one end of the transmission rod 31 is hinged to the hinge column 30, the transmission rod 31 can only swing under the joint action of the sliding sleeve block 32 and the hinge column 30. The three transmission rods 31 swing synchronously, and the retaining rod 8 can be clamped by the clamping wheel 33 to limit the retaining rod 8, so that the retaining rod 8 can remain stable during the working process, and through the mutual cooperation of the transverse movement mechanism 200, the retaining rod 8 can maintain stability at different spacings.

[0064] Furthermore, the driving unit includes a support member, a driving motor 23 and a screw rod 29 drivingly connected to the driving motor 23. The support member includes a support column 24 fixed at the top of the supporting ring plate 22. The top of the support column 24 is hinged with a first hinge block 25. An extension block 27 is integrally extended from the side of the annular support block 26. The top of the extension block 27 is hinged with a second hinge block 28. One end of the screw rod 29 rotates to pass through the first hinge block 25, and the other end of the screw rod 29 is threaded to pass through the second hinge block 28.

[0065] Specifically, the driving motor 23 is a forward and reverse motor. When the driving motor 23 drives the screw rod 29 to rotate, since the screw rod 29 is threadedly connected to the second hinge block 28, the second hinge block 28 will be driven to move by the screw rod 29, thereby driving the extension block 27 and the annular support block 26 to rotate, thereby realizing the rotation adjustment of the fixing ring 34, and the forward and reverse rotation of the driving motor 23 can realize the forward and reverse rotation of the fixing ring 34, thereby realizing the clamping or loosening of the retaining rod 8 by the clamping unit.

[0066] It can be seen from the above description that, in the face of pipes of different diameters, it is necessary to select retaining rods 8 of different diameters to ensure the clamping strength of the pipes. Through the arrangement of the transverse movement mechanism 200 and the clamping mechanism 300, the transverse movement mechanism 200 can drive the movement of the clamping mechanism 300 and then drive the retaining rod 8 to move. By adjusting the movement of the retaining rod 8, the distance between the two retaining rods 8 can be adjusted laterally, thereby adapting to the clamping and interception of pipes of different diameters. At the same time, the adjustable setting of the clamping unit can drive the transmission rod 31 to swing by adjusting the position of the annular support block 26, thereby adjusting the spacing between the clamping wheels 33, so that the clamping mechanism 300 can adapt to retaining rods 8 of different diameters, further improving the applicability of the device.

[0067] Embodiment 3

[0068] The pipeline temporary cutting device of this embodiment, based on the above-mentioned embodiment 1 or embodiment 2, further defines the overall mechanical connection relationship of the limiting mechanism 400 as follows:

[0069] See also Figure 1 , Fig. 9 and Fig.10 The ends of the two mounting plates 16 that are away from each other are fixedly connected with an L-shaped support rod 36, and a limiting mechanism 400 is set at the free end of the support rod 36.

[0070] Specifically, the limiting mechanism 400 includes a lower clamping block 35 rotatably connected to the free end of the support rod 36 and a quantitative limiting unit arranged at the top of the lower clamping block 35. A T-slot 37 is provided at the top of the lower clamping block 35. The quantitative limiting unit includes a vertical rod 39, an upper clamping block 40 and an eccentric connecting plate 41. The eccentric connecting plate 41 is rotatably installed at the end of the upper clamping block 40 away from the retaining frame 100. The eccentric connecting plate 41 is a regular hexagonal structure. The bottom end of the vertical rod 39 is movably clamped in the T-slot 37. After the top end of the vertical rod 39 extends out of the T-slot 37, it is movably connected to the upper clamping block 40, and an adjustment unit is installed at the top of the upper clamping block 40 for driving the upper clamping block 40 to move up and down along the length direction of the vertical rod 39.

[0071] In this embodiment, a clamping block 38 is movably provided at the bottom end of the T-shaped slot 37 , and the bottom end of the vertical rod 39 is fixedly connected to the clamping block 38 .

[0072] In this embodiment, a groove is provided at one end of the upper clamping block 40 away from the retaining frame 100, and the eccentric connecting plate 41 is rotatably installed in the groove, and the geometric center of the eccentric connecting plate 41 does not coincide with the installation point, so the distance between the upper clamping block 40 and the lower clamping block 35 can be adjusted by adjusting different sides of the eccentric connecting plate 41 to abut against the top surface of the lower clamping block 35. Since the size of the eccentric connecting plate 41 is fixed, the distance between the upper clamping block 40 and the lower clamping block 35 can be quantitatively adjusted, thereby achieving clamping of a quantitative distance between the upper blocking plate 2 and the lower blocking plate 3, so that when the branch pipe is clamped, it will not affect the leakage point welding work, and the measuring point downstream of the branch pipe can be detected normally.

[0073] Furthermore, the adjustment unit includes a movable block 42 and an adjusting nut 43 which are both movably mounted on the vertical rod 39, and the adjusting nut 43 is threadedly connected to the vertical rod 39. The movable block 42 is fixedly connected to the upper clamping block 40 and is rotatably connected to the bottom end of the adjusting nut 43. By rotating the adjusting nut 43, the movable block 42 and the upper clamping block 40 can be driven to move up and down, thereby adapting to the eccentric connecting plate 41 in different placement positions.

[0074] The cam 41 is a substantially parallel arrangement in which the upper and lower blocks 40 are brought into contact with each other, and the cam 42 is preferably arranged so as to prevent the cam 41 from being loosened and the upper and lower blocks 40 from being loosened.

[0075] The working principle of the present invention is as follows: after the leakage point of the pipeline is found, the retaining frame 100 is arranged at the upstream position of the pipeline leakage point, and then the clamping mechanism 300 and the transverse movement mechanism 200 are arranged at the bottom end of the retaining rod 8, and the clamping mechanism 300 clamps the retaining rod 8. After the holding rod 8 is stable, the vertical rod 39 is rotated so that the upper clamping block 40 and the lower clamping block 35 are facing the side away from the holding frame 100, and then the transverse movement mechanism 200 is adjusted to make the two holding rods 8 at a suitable distance, and then the lifting device 10 is started to make the upper blocking plate 2 and the lower blocking plate 3 close to each other for clamping, so that the pipeline is deformed to achieve flow cutoff, and then the upper clamping block 40 and the lower clamping block 35 are turned back so that the upper clamping block 40 and the lower clamping block 35 clamp the upper blocking plate 2 and the lower blocking plate 3. If the spacing between the upper blocking plate 2 and the lower blocking plate 3 is too large, the lifting device 10 continues to lift the lower blocking plate 3 until the upper clamping block 40 and the lower clamping block 35 can clamp the upper blocking plate 2 and the lower blocking plate 3. According to the diameter of different pipelines, different edges of the eccentric connecting plate 41 can be selected to press against the top surface of the lower clamping block 35 to adjust the spacing between the upper clamping block 40 and the lower clamping block 35.

[0076] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A temporary pipeline cutting device, characterized in that: The retaining frame (100) comprises a pair of retaining rods (8) arranged in parallel and spaced apart from each other, two sections of threaded rods (9) are arranged on the retaining rods (8) at intervals, and the threaded rods (9) are arranged integrally with the retaining rods (8); An upper cover plate (1), an upper blocking plate (2), a lower blocking plate (3) and a pad (4) are arranged in sequence from top to bottom between the two retaining rods (8); two symmetrically arranged movable grooves (101) are provided on the upper cover plate (1), the upper blocking plate (2), the lower blocking plate (3) and the pad (4); the retaining rod (8) is movable through each movable groove (101) in sequence from top to bottom; a clamping nut (7) threadedly sleeved on a threaded rod (9) located at the upper end of the retaining rod (8) is arranged at the top end of the upper cover plate (1); a jacking nut (6) threadedly sleeved on a threaded rod (9) located at the lower end of the retaining rod (8) is arranged at the bottom end of the pad (4); and a lifting device (10) for lifting the lower blocking plate (3) is also arranged between the lower blocking plate (3) and the pad (4).

2. A pipeline temporary cutting device according to claim 1, characterized in that: A lower cover plate (5) movably mounted between two retaining rods (8) is also provided between the tightening nut (6) and the backing plate (4).

3. A pipeline temporary cutting device according to claim 1, characterized in that: A top plate (11) is arranged at the top of the lifting device (10), and the top plate (11) is arranged in contact with the bottom end of the lower blocking plate (3).

4. A pipeline temporary cutting device according to claim 1, characterized in that: The bottom ends of the two retaining rods (8) are each provided with a clamping mechanism (300) for clamping the retaining rod (8), and the bottom ends of the clamping mechanisms (300) are provided with a transverse movement mechanism (200) for driving the two clamping mechanisms (300) to move along the length direction of the movable groove (101).

5. A pipeline temporary cutting device according to claim 4, characterized in that: The transverse movement mechanism (200) comprises a bottom plate (14), two moving units are arranged at the top of the bottom plate (14), and the moving units comprise a plurality of parallel and spaced slide rails (15) and a mounting plate (16) slidably connected to each of the slide rails (15); A swing rod (17) hingedly mounted on the top of the bottom plate (14) is provided at the middle position between the two moving units, and push-pull rods (18) are hingedly mounted at both ends of the swing rod (17), and the free ends of the two push-pull rods (18) are respectively hingedly mounted on the middle of the two mounting plates (16); An extension plate (21) is integrally extended from the side of the base plate (14), a telescopic drive mechanism (19) is installed on the top of the extension plate (21), and the telescopic drive mechanism (19) is transmission-connected to a telescopic rod (20) for driving one of the mounting plates (16) to reciprocate along the slide rail (15).

6. A pipeline temporary cutting device according to claim 5, characterized in that: The clamping mechanism (300) comprises a supporting ring plate (22) fixedly mounted on the top of the mounting plate (16), an annular supporting block (26) being rotatably mounted on the top of the supporting ring plate (22), and a fixing ring (34) being fixed at intervals on the top of the annular supporting block (26); The top of the support ring plate (22) is also provided with at least three clamping units arranged in a circumferential array, the clamping unit comprising a hinge column (30) fixedly mounted on the top of the support ring plate (22), a transmission rod (31) one end of which is hinged to the top of the hinge column (30) and the other end of which is rotatably connected to a clamping wheel (33), and a sliding sleeve block (32) slidably sleeved on the transmission rod (31), the arc surface of the clamping wheel (33) being arranged to fit the retaining rod (8), and the sliding sleeve block (32) being hinged to the fixing ring (34); A driving unit for driving the annular support block (26) to rotate is also provided at the top end of the supporting ring plate (22).

7. A pipeline temporary cutting device according to claim 6, characterized in that: The driving unit comprises a support member, a driving motor (23) and a screw rod (29) drivingly connected to the driving motor (23); the support member comprises a supporting column (24) fixed at the top end of a supporting ring plate (22); a first hinge block (25) is hingedly connected to the top end of the supporting column (24); an extension block (27) is integrally extended from the side of the annular supporting block (26); a second hinge block (28) is hingedly connected to the top end of the extension block (27); one end of the screw rod (29) rotates through the first hinge block (25); the other end of the screw rod (29) is threadedly connected through the second hinge block (28).

8. A pipeline temporary cutting device according to claim 5, characterized in that: The ends of the two mounting plates (16) that are away from each other are both fixedly connected with an L-shaped support rod (36), and the free end of the support rod (36) is provided with a limiting mechanism (400), and the limiting mechanism (400) comprises a lower clamping block (35) rotatably connected to the free end of the support rod (36) and a quantitative limiting unit arranged at the top of the lower clamping block (35), and the top of the lower clamping block (35) is provided with a T-shaped slot (37), and the quantitative limiting unit comprises a vertical rod (39), an upper clamping block (40) and an eccentric A connecting plate (41), wherein the eccentric connecting plate (41) is rotatably mounted on one end of the upper clamping block (40) away from the retaining frame (100), and the eccentric connecting plate (41) is a regular polygonal structure. The bottom end of the vertical rod (39) is movably clamped in the T-shaped slot (37), and the top end of the vertical rod (39) extends out of the T-shaped slot (37) and is movably sleeved with the upper clamping block (40), and an adjustment unit is installed at the top end of the upper clamping block (40) for driving the upper clamping block (40) to move up and down along the length direction of the vertical rod (39).

9. A pipeline temporary cutting device according to claim 4, characterized in that: The adjustment unit comprises a movable block (42) and an adjustment nut (43) both movably sleeved on the vertical rod (39), and the adjustment nut (43) is threadedly connected to the vertical rod (39), and the movable block (42) is fixedly connected to the upper clamping block (40) and rotatably connected to the bottom end of the adjustment nut (43).

10. A pipeline temporary cutting device according to claim 1, characterized in that: A compression strip (12) is detachably mounted at the same position on the bottom end of the upper blocking plate (2) and the top end of the lower blocking plate (3); and a plurality of pairs of additional strips (13) of different lengths are detachably mounted on the top end of the upper cover plate (1).

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