A pipe threading device for polyethylene-lined composite pipe

Abstract

The present invention relates to a pipe threading device for a polyethylene-lined composite pipe, and belongs to the technical field of post-processing of plastic molded products. It comprises an inner liner pipe traction device, a winding device, a slide rail and a clamping device. The inner liner pipe traction device is used to drive the inner liner pipe to be threaded into the inner part of the outer sleeve. The winding device pulls the inner liner pipe traction device to move by wire. A plurality of support seats are provided on the slide rail, and the support seats are used to support the outer sleeve. The clamping device comprises two oppositely arranged extrusion blocks, which are connected to the telescopic rod of the hydraulic cylinder. The two extrusion blocks move toward each other to clamp the outer sleeve arranged therebetween. The present invention clamps the inner liner pipe by the inner liner pipe traction device, provides pulling force by the winding device, completes the threading process between the inner liner pipe and the outer sleeve, reduces labor intensity, and improves production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of post-processing of plastic molded products, and in particular relates to a pipe threading device for a polyethylene-lined composite pipe. Background Art

[0002] Polyethylene composite pipe is a pipe made of polyethylene and other materials. It is generally made of polyethylene pipe inside and covered with a metal or other non-metallic outer sleeve outside. This composite pipe is mainly used in the field of medium transportation such as petroleum, chemical or natural gas. These media come into contact with polyethylene pipes during transportation. Polyethylene pipes have strong corrosion resistance and are not easily damaged. The outer sleeve outside the polyethylene pipe mainly plays a protective role. For example, the outer sleeve made of metal can increase the hardness of the overall composite pipe and avoid bumps.

[0003] The existing pipe threading operation is to manually cut the front end of the polyethylene pipe so that it can be inserted into the outer sleeve, and then manually pull it to complete the pipe threading operation. This method is time-consuming and laborious, especially because the physical strength of the operator is limited and continuous operation cannot be achieved. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a polyethylene lined composite pipe threading device. The present invention clamps the inner liner pipe through an inner liner pipe traction device, provides tension through a winding device, completes the threading process between the inner liner pipe and the outer sleeve, reduces labor intensity, allows continuous operation, and improves production efficiency.

[0005] The technical solution adopted by the present invention to solve the problems existing in the prior art is:

[0006] A polyethylene lined composite pipe threading device comprises an inner liner pipe traction device, a winding device, a slide rail and a clamping device.

[0007] The inner liner tube traction device is used to drive the inner liner tube to pass into the outer sleeve.

[0008] The wire winding device drives the inner liner pipe traction device to move by pulling the wire.

[0009] A plurality of support seats are arranged on the slide rail, and the support seats are used for supporting the outer sleeve.

[0010] The clamping device comprises two extrusion blocks arranged opposite to each other, the extrusion blocks are connected to the telescopic rod of the hydraulic cylinder, and the two extrusion blocks move towards each other to clamp the outer sleeve arranged therebetween.

[0011] Preferably, the liner pipe traction device includes a bracket, a plurality of lower splints are fixed to the front end of the bracket through a connecting plate, the lower splints have upper splints corresponding to each other, the upper splints are connected to the lower splints in an opening and closing manner, and the rear end of the bracket is fixedly connected to the wire.

[0012] Preferably, a plurality of rollers are provided on the outer side of the bracket, and the rollers abut against the inner wall of the outer sleeve.

[0013] Preferably, the bracket is a frame structure, a plurality of limiting rings are fixed inside the bracket, the limiting rings are sleeved outside the screw, and the screw is rotatably connected to the limiting rings.

[0014] The screw rod is sleeved with a nut sleeve which is threadedly connected, the outer wall of the nut sleeve is hinged with a support rod, and the end of the support rod is rotatably connected with a roller.

[0015] The support rod is sleeved with a sliding sleeve which is slidably connected, the sliding sleeve is rotatably connected with a fixing rod, and the fixing rod is fixedly connected to the bracket.

[0016] Preferably, the nut sleeve is externally hinged with 3 to 6 support rods distributed in a ring array around its axis.

[0017] Preferably, a plurality of protrusions are provided on the end surface of the upper clamping plate facing the lower clamping plate.

[0018] Preferably, a fastening bolt is passed between the upper clamping plate and the lower clamping plate, the fastening bolt is rotatably connected to the lower clamping plate, and the fastening bolt is threadedly connected to the upper clamping plate.

[0019] Preferably, a table is provided under the winding device and the slide rail, the winding device is fixedly connected to the table, the bottom of the slide rail is spaced apart from the table, one end of the slide rail facing the winding device is hinged to the table, and a pad is provided at the bottom of the end of the slide rail facing away from the winding device.

[0020] Preferably, a guide device is fixed between the slide rail and the winding device, and a threading hole is provided on the guide device. After the wire passes through the threading hole, it is connected to the inner liner tube traction device, and the threading hole is a bell-shaped mouth on the side facing the winding device.

[0021] Preferably, a second sliding rod is provided on the table top, and the hydraulic cylinder is slidably connected to the second sliding rod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The inner liner is clamped by the inner liner traction device, and the winding device provides tension to complete the threading process between the inner liner and the outer casing, thereby reducing labor intensity and improving production efficiency.

[0024] (2) The position of the roller supporting the inner liner pipe traction device and the position of the clamping device can be adjusted, and the support seat can be replaced, so that it can adapt to outer sleeves of different sizes, thereby improving the adaptability of the inner liner polyethylene composite pipe threading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 This is the first structural diagram of a polyethylene lined composite pipe threading device of the present invention.

[0027] Figure 2 This is the second structural diagram of a polyethylene lined composite pipe threading device of the present invention.

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A.

[0029] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0030] Figure 5 This is the first structural diagram of the inner liner pipe pulling device in the inner liner polyethylene composite pipe threading device of the present invention.

[0031] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0032] Figure 7 This is the second structural diagram of the inner liner pipe pulling device in the inner liner polyethylene composite pipe threading device of the present invention.

[0033] Figure 8 This is a cross-sectional view of a guide device in a polyethylene-lined composite pipe threading device of the present invention.

[0034] Fig. 9 This is a structural diagram of a cushion block in a polyethylene-lined composite pipe threading device of the present invention.

[0035] Fig.10 This is a structural diagram of a polyethylene-lined composite pipe threading device of the present invention in working state.

[0036] Fig.11 for Fig.10 A partial cross-sectional view of

[0037] Fig.12 for Fig.11 A partial enlarged view of point D in the middle.

[0038] In the figure: 1-upper clamp, 101-protrusion, 2-lower clamp, 3-fastening bolt, 4-connecting plate, 5-bracket, 6-limiting ring, 7-connector, 8-screw, 801-first handle, 9-nut sleeve, 10-support rod, 11-roller, 12-sliding sleeve, 13-fixed rod, 14-line, 15-winding device, 16-slide rail, 1601-rotating shaft, 17-first slide bar, 1701-second handle, 18-support seat, 19-guide device, 1901-threading hole, 20-extrusion block, 21-hydraulic cylinder, 22-second slide bar, 23-table, 2301-slideway, 2302-bearing seat, 24-pad, 2401-inclined surface, 2402-third handle, 25-outer sleeve, 26-inner liner, 2601-shear surface. DETAILED DESCRIPTION

[0039] The following is a further detailed description of a polyethylene lined composite pipe threading device of the present invention in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0040] A polyethylene lined composite pipe threading device, comprising Figures 1 to 12 As shown, it includes an inner liner pipe traction device, a winding device 15, a slide rail 16 and a clamping device.

[0041] The inner liner tube traction device is used to drive the inner liner tube 26 to pass into the outer sleeve 25.

[0042] The inner liner tube traction device includes a bracket 5, and a plurality of lower clamping plates 2 are fixed to the front end of the bracket 5 through a connecting plate 4. The plurality of lower clamping plates 2 are distributed in a circular array around the axis of the outer sleeve 25, and two adjacent lower clamping plates 2 are arranged at intervals.

[0043] The lower clamping plates 2 correspond to the upper clamping plates 1 one by one, and the upper clamping plates 1 are connected to the lower clamping plates 2 in an opening and closing manner. When in use, the front end of the inner liner tube 26 is first sheared to cut out a plurality of shearing surfaces 2601 arranged at intervals. The front end of the shearing surface 2601 is inserted between the upper clamping plate 1 and the lower clamping plate 2, and then the upper clamping plate 1 and the lower clamping plate 2 are closed to clamp the shearing surface 2601 therebetween.

[0044] In this embodiment, a plurality of protrusions 101 are convexly provided on the end surface of the upper clamp 1 facing the lower clamp 2, and the height of the protrusion 101 is less than the thickness of the shear surface 2601. When the upper clamp 1 and the lower clamp 2 clamp the shear surface 2601, the protrusion 101 squeezes the shear surface 2601 to increase the contact area, thereby optimizing the clamping effect. During the traction process of the inner liner tube 26, the shear surface 2601 will not fall off.

[0045] A fastening bolt 3 is provided between the upper clamping plate 1 and the lower clamping plate 2. In this embodiment, there are four fastening bolts 3, two on each side. The fastening bolt 3 is rotatably connected to the lower clamping plate 2, and the fastening bolt 3 is threadedly connected to the upper clamping plate 1. By rotating the fastening bolt 3, the spacing between the upper clamping plate 1 and the lower clamping plate 2 can be adjusted.

[0046] After the inner liner tube traction device is fixedly connected to the inner liner tube 26, the winding device 15 is started to start the recovery line 14, thereby pulling the inner liner tube traction device to move inside the outer tube 25. In order to prevent the inner liner tube traction device from shaking during movement, thereby causing uneven force on the inner liner tube 26. In this embodiment, a plurality of rollers 11 are provided on the outside of the bracket 5, and the rollers 11 are distributed in a circular array around the axis of the outer tube 25. The rollers 11 abut against the inner wall of the outer tube 25, and the rollers 11 support the inner liner tube traction device so that it does not shake during movement, and at the same time can reduce the friction resistance of movement.

[0047] Since the inner liner tube 26 needs to be inserted into the outer sleeves 25 of different specifications, it is necessary to ensure that the spacing between the rollers 11 is adjustable so that the inner liner tube traction device can adapt to the outer sleeves 25 of different inner diameters.

[0048] In order to achieve the above purpose, in this embodiment, the bracket 5 is a frame structure, and a plurality of limit rings 6 are fixed inside the bracket 5. The limit rings 6 are sleeved on the outside of the screw 8. The screw 8 is rotatably connected to the limit rings 6. The limit rings 6 prevent the screw 8 from axial movement.

[0049] The screw rod 8 is sleeved with a threaded nut sleeve 9, the outer wall of the nut sleeve 9 is hinged with a support rod 10, and the outside of the nut sleeve 9 is hinged with 3 to 6 support rods 10 distributed in a circular array around its axis, and the end of the support rod 10 is rotatably connected to a roller 11.

[0050] The support rod 10 is sleeved with a sliding sleeve 12 which is slidably connected. The sliding sleeve 12 is rotatably connected to a fixing rod 13 , and the fixing rod 13 is fixedly connected to the bracket 5 .

[0051] The position of the sliding sleeve 12 is fixed and can only rotate. By rotating the screw 8, the relative position between the nut sleeve 9 and the sliding sleeve 12 is adjusted, and then the angle between the support rod 10 and the screw 8 is changed, the outward extension and retraction of the roller 11 can be achieved, so that the inner liner tube traction device is suitable for outer sleeves 25 with different inner diameters.

[0052] In order to facilitate the rotation of the screw rod 8, a first handle 801 is provided at the end of the screw rod 8. In order to improve the supporting effect of the inner liner tube traction device, at least two nut sleeves 9 are sleeved on the screw rod 8, and at least two groups of rollers 11 are provided to support the inner liner tube traction device.

[0053] The winding device 15 is a prior art, and a winch with a speed reduction mechanism can be used, which is wound with a wire 14, and the inner liner traction device is pulled by the wire 14. During the pulling process, the traction force needs to be arranged along the axial direction of the outer sleeve 25. Therefore, the wire 14 is in a horizontal state at a certain distance before being connected to the inner liner traction device.

[0054] To achieve this purpose, a guide device 19 is fixed between the slide rail 16 and the winding device 15. The guide device 19 is provided with a threading hole 1901. The wire 14 passes through the threading hole 1901 and is connected to the inner liner tube traction device. The threading hole 1901 is a bell mouth on the side facing the winding device 15. After the wire 14 passes through the threading hole 1901, it is connected to the rear end connector 7 of the bracket 5 of the inner liner tube traction device in a horizontal state.

[0055] The slide rail 16 is provided with a plurality of support seats 18 for supporting the outer sleeve 25. The top surface of the support seat 18 is a semicircular arc surface, which is the same as the outer diameter of the outer sleeve 25 for easy support.

[0056] At the same time, in order to adapt to outer sleeves 25 of different sizes, the support seat 18 is detachably connected to the slide rail 16 and can slide, which is convenient for replacing support seats 18 of different specifications and placing the position of the support seat 18 according to the length of the outer sleeve 25.

[0057] At least two first slide bars 17 are arranged in parallel on the slide rail 16, and a through hole is provided on the support seat 18, through which the first slide bar 17 passes. A threaded portion is provided at one end of the first slide bar 17, and a second handle 1701 is fixed at the other end, and both ends are penetrated to the outside of the slide rail 16. One end of the first slide bar 17 is slidably connected to the side wall of the slide rail 16, and the other end is threadedly connected to the side wall of the slide rail 16. When the support seat 18 needs to be replaced, the first slide bar 17 is rotated to release the threaded connection between the two, and then a part of the first slide bar 17 is pulled out to leave a space for placing the support seat 18. The support seat 18 is placed inside the slide rail 16, and then after being plugged with the first slide bar 17, it moves inside the slide rail 16. After installing a sufficient number of support seats 18, the first slide bar 17 is tightened again to be threadedly connected to the slide rail 16. Then, the support seat 18 is placed inside the slide rail 16 so that the length of the support seat 18 matches that of the outer sleeve 25.

[0058] A plurality of screws are threadedly connected on the side surface in the width direction of the slide rail 16. After the support seat 18 is in place, the screws are rotated so that the screw heads abut against the support seat 18 to ensure that the support seat 18 is fixed.

[0059] The clamping device includes two extrusion blocks 20 arranged opposite to each other, the extrusion blocks 20 are connected to the telescopic rod of the hydraulic cylinder 21, and the two extrusion blocks 20 move toward each other to clamp the outer sleeve 25 arranged therebetween. In this embodiment, at least two sets of clamping devices are provided on both sides of the slide rail 16. The horizontal cross-section of the extrusion block 20 is L-shaped, and the extrusion block 20 is clamped with the flanges at the front and rear ends of the outer sleeve 25 during the clamping process of the front and rear ends of the outer sleeve 25, further preventing the outer sleeve 25 from shifting when the inner liner 26 is inserted.

[0060] A table 23 is provided below the winding device 15 and the slide rail 16, the winding device 15 is fixedly connected to the table 23, the bottom of the slide rail 16 is spaced apart from the table 23, and a rotating shaft 1601 is protruded on both sides of one end of the slide rail 16 facing the winding device 15, and the rotating shaft 1601 is inserted into the inside of the bearing seat 2302, and the bearing seat 2302 is fixedly connected to the table 23. The hinge connection between the slide rail 16 and the table 23 is realized through the rotating shaft 1601 and the bearing seat 2302.

[0061] A pad 24 is provided at the bottom of one end of the slide rail 16 away from the winding device 15 , and the pad 24 is slidably disposed inside a slideway 2301 on the table 23 .

[0062] After the outer sleeve 25 is installed, the cushion block 24 is pulled out so that the slide rail 16 is arranged tilted so that the inner liner traction device can slide to the other end of the outer sleeve 25. Then the cushion block 24 is pushed in to ensure that the slide rail 16 moves back to a horizontal state.

[0063] In order to facilitate the insertion and withdrawal of the cushion block 24 , an inclined surface 2401 and a third handle 2402 are respectively provided at both ends of the cushion block 24 .

[0064] In order to adapt to outer sleeves 25 of different lengths, a second sliding rod 22 is provided on the table 23 , and the hydraulic cylinder 21 is slidably connected to the second sliding rod 22 .

[0065] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A polyethylene lined composite pipe threading device, Features: It comprises an inner liner tube pulling device, a winding device (15), a slide rail (16) and a clamping device; The inner liner tube pulling device is used to drive the inner liner tube (26) to pass into the inner part of the outer sleeve (25); The wire winding device (15) pulls the inner liner pipe traction device to move via the wire (14); A plurality of support seats (18) are provided on the slide rail (16), and the support seats (18) are used to support the outer sleeve (25); The clamping device comprises two extrusion blocks (20) arranged opposite to each other, the extrusion blocks (20) being connected to the telescopic rod of the hydraulic cylinder (21), the two extrusion blocks (20) moving towards each other to clamp the outer sleeve (25) arranged therebetween, the horizontal cross-section of the extrusion block (20) being L-shaped, and during the process of clamping the front and rear ends of the outer sleeve (25), the extrusion blocks (20) and the flanges at the front and rear ends of the outer sleeve (25) are clamped together; The inner liner tube pulling device comprises a bracket (5), a plurality of lower clamping plates (2) are fixed to the front end of the bracket (5) via a connecting plate (4), the plurality of lower clamping plates (2) are distributed in a circular array around the axis of the outer sleeve (25), and two adjacent lower clamping plates (2) are arranged at intervals; The lower clamping plates (2) correspond to the upper clamping plates (1) one by one, and the upper clamping plates (1) and the lower clamping plates (2) are connected in an opening and closing manner. When in use, the front end of the inner liner tube (26) is first sheared to cut out a plurality of shearing surfaces (2601) arranged at intervals, and the front end of the shearing surface (2601) is inserted between the upper clamping plates (1) and the lower clamping plates (2). Then, the upper clamping plates (1) and the lower clamping plates (2) are closed to clamp the shearing surfaces (2601) therebetween. After the inner liner tube traction device is fixedly connected to the inner liner tube (26), the winding device (15) is started to start to recycle the wire (14), thereby pulling the inner liner tube traction device to move inside the outer sleeve (25); A fastening bolt (3) is provided between the upper clamping plate (1) and the lower clamping plate (2), the fastening bolt (3) is rotatably connected to the lower clamping plate (2), the fastening bolt (3) is threadedly connected to the upper clamping plate (1), and the fastening bolt (3) is rotated; A plurality of rollers (11) are provided on the outer side of the bracket (5), and the rollers (11) abut against the inner wall of the outer sleeve (25); The bracket (5) is a frame-type structure. A plurality of limiting rings (6) are fixed inside the bracket (5). The limiting rings (6) are sleeved outside the screw rod (8). The screw rod (8) is rotatably connected to the limiting rings (6). The limiting rings (6) prevent the screw rod (8) from axial movement. The screw rod (8) is sleeved with a nut sleeve (9) which is threadedly connected, the outer wall of the nut sleeve (9) is hinged with a support rod (10), and the end of the support rod (10) is rotatably connected with a roller (11); The support rod (10) is sleeved with a sliding sleeve (12) which is slidably connected, the sliding sleeve (12) is rotatably connected to a fixing rod (13), and the fixing rod (13) is fixedly connected to the bracket (5); The position of the sliding sleeve (12) is fixed and can only rotate. By rotating the screw rod (8), the relative position between the nut sleeve (9) and the sliding sleeve (12) is adjusted, thereby changing the angle between the support rod (10) and the screw rod (8), so that the roller (11) can be extended and retracted, so that the inner liner tube traction device is suitable for outer sleeves (25) with different inner diameters. The support seat (18) is detachably connected to the slide rail (16), and at least two first slide bars (17) arranged in parallel are provided on the slide rail (16). A through hole is provided on the support seat (18), and the first slide bar (17) passes through the through hole. One end of the first slide bar (17) is provided with a threaded portion, and the other end is fixed with a second handle (1701). Both ends are penetrated to the outside of the slide rail (16), one end of the first slide bar (17) is slidably connected to the side wall of the slide rail (16), and the other end is threadedly connected to the side wall of the slide rail (16).

2. A polyethylene lined composite pipe threading device according to claim 1, Features: The nut sleeve (9) is externally hinged with 3 to 6 support rods (10) distributed in a ring array around its axis.

3. A polyethylene lined composite pipe threading device according to claim 1 or 2, Features: A plurality of protrusions (101) are convexly provided on the end surface of the upper clamping plate (1) facing the lower clamping plate (2).

4. A polyethylene lined composite pipe threading device according to claim 1 or 2, Features: A table top (23) is provided below the wire winding device (15) and the slide rail (16); the wire winding device (15) is fixedly connected to the table top (23); the bottom of the slide rail (16) is spaced apart from the table top (23); one end of the slide rail (16) facing the wire winding device (15) is hinged to the table top (23); and a cushion block (24) is provided at the bottom of one end of the slide rail (16) facing away from the wire winding device (15).

5. A polyethylene lined composite pipe threading device according to claim 4, Features: A guide device (19) is fixed between the slide rail (16) and the winding device (15), and a threading hole (1901) is provided on the guide device (19). The wire (14) passes through the threading hole (1901) and is connected to the inner liner tube traction device. The threading hole (1901) is formed into a bell mouth on the side facing the winding device (15).

6. A polyethylene lined composite pipe threading device according to claim 4, Features: A second sliding rod (22) is provided on the table top (23), and the hydraulic cylinder (21) is slidably connected to the second sliding rod (22).

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