Connecting and mounting device and mounting method for three-layer PE (Poly Ethylene) pipe

Abstract

The invention belongs to the technical field of three-layer PE pipes, and discloses a three-layer PE pipe bearing and mounting device and mounting method.The three-layer PE pipe bearing and mounting device comprises a sealing mechanism, and the sealing mechanism comprises a first hoop; the invention discloses a bearing and mounting method for three layers of PE pipes. The mounting method comprises the following steps that S1, firstly, a lantern ring is connected to the center position of an arc-shaped steel pipe in a sleeving mode; through cooperation of structures such as a sealing lip and a sealing strip, sealing of the connecting position of the straight steel pipe and the arc-shaped steel pipe is facilitated, the straight steel pipe moves in the direction close to the arc-shaped steel pipe, the sealing groove and the sealing strip are clamped, and the two sides of the sealing lip abut against the outer inclined groove and the inner inclined groove correspondingly; the connecting position of the steel pipe is sealed through the sealing lip, the connecting position of the first hoop and the steel pipe and the connecting position of the second hoop and the steel pipe are sealed through the first sealing ring and the second sealing ring, the sealing performance between the first sealing ring and the second sealing ring is improved through the sealing strip, the sealing performance of the connecting position is enhanced, and liquid or gas in a pipeline is prevented from leaking.

Description

Technical Field

[0001] The invention belongs to the technical field of three-layer PE pipes, and in particular relates to a receiving and installing device and an installing method for a three-layer PE pipe. Background Art

[0002] The three-layer PE pipe is composed of a steel pipe layer, an adhesive layer and a polyethylene anti-corrosion layer. In modern urban construction and renovation, the three-layer PE pipe has become the preferred material for pipeline systems such as water supply and gas transmission due to its excellent corrosion resistance, wear resistance and long service life. However, the installation process of the three-layer PE pipe, especially the connection of large-diameter pipes, has always been a difficult problem in the construction field.

[0003] Most of the existing three-layer PE pipe connection and installation devices directly weld two aligned steel pipes by welding. The quality of the anti-corrosion layer repair in the weld area is difficult to ensure, especially the fit and sealing of the heat shrink tape. Therefore, a three-layer PE pipe connection and installation device is proposed. Summary of the invention

[0004] In order to solve the problem raised in the above background technology that most of the time, when welding two aligned steel pipes directly by welding, the quality of the anti-corrosion layer repair in the weld area is difficult to ensure, especially the fit and sealing of the heat shrinkable tape, the present invention provides a three-layer PE pipe receiving and installing device and installation method.

[0005] To achieve the above object, the present invention provides the following technical solution: a receiving and installing device for a three-layer PE pipe, comprising a sealing mechanism, a positioning mechanism is arranged on the side of the sealing mechanism, a three-layer PE pipe mechanism is arranged inside the sealing mechanism and the positioning mechanism, and a buffer mechanism is arranged on the side of the sealing mechanism and the positioning mechanism;

[0006] The sealing mechanism includes a first clamp, both ends of the first clamp are fixedly connected with fixed flanges, the inner wall of the first clamp is fixedly connected with a first sealing ring, one end of the first sealing ring is fixedly connected with a clamping block, the end of the first sealing ring away from the clamping block is provided with a clamping groove, the inner wall of the first sealing ring is fixedly connected with a sealing lip, the side of the first sealing ring is slidably connected with a sealing strip, a side of the first clamp close to the sealing strip is evenly provided with a plurality of positioning holes, a side of the first clamp is fixedly connected with a buckle, one of the fixing flanges is provided with a threaded hole, and the internal thread of the threaded hole is connected with a bolt.

[0007] Preferably, the block is clamped with the slot, the buckle is L-shaped, a positioning hole is provided at the end of the buckle away from the first clamp, the size of the sealing strip is smaller than the size of the first sealing ring, the plurality of positioning holes are located on the outside of the first sealing ring, and the bolt passes through two fixing flanges.

[0008] Preferably, the positioning mechanism comprises a second clamp, a second sealing ring is fixedly connected to the interior of the second clamp, a sealing groove is provided on the second sealing ring, and a plurality of positioning rods are fixedly connected to the second clamp.

[0009] Preferably, a buckle is fixedly connected to the second clamp, the size of the second clamp is the same as the size of the first clamp, the size of the second sealing ring is the same as the size of the first sealing ring, the sealing groove is located on the side of the second clamp close to the first clamp, and several positioning rods are located on the side of the second clamp close to the first clamp.

[0010] Preferably, the size of the sealing strip is adapted to the size of the sealing groove, the sealing strip and the sealing groove are clamped together, the size of the positioning rod is adapted to the size of the positioning hole, the positioning rod and the positioning hole are clamped together, the buckle on the second hoop is clamped to the buckle on the first hoop through the positioning rod, and the two buckles are combined to form a semicircular ring.

[0011] Preferably, the three-layer PE pipe structure includes a straight steel pipe and an arc-shaped steel pipe, both ends of which are respectively provided with an outer bevel groove and an inner bevel groove, and the surfaces of the straight steel pipe and the arc-shaped steel pipe are fixedly connected to the polyethylene anti-corrosion layer through an adhesive layer.

[0012] Preferably, the size of the outer bevel groove is matched with the size of the inner bevel groove, the first clamp is sleeved on the end of the straight steel pipe and the curved steel pipe with the outer bevel groove, the second clamp is sleeved on the end of the straight steel pipe and the curved steel pipe with the inner bevel groove, the first sealing ring and the second sealing ring are abutted against the surface of the straight steel pipe and the curved steel pipe, and the sealing lip is located between the outer bevel groove and the inner bevel groove.

[0013] Preferably, the buffer mechanism includes a ring, the inner wall of the ring is fixedly connected to a crash pad, the side of the ring is fixedly connected to a buffer cylinder, the interior of the buffer cylinder is slidably connected to a piston rod, the two sides of the inner wall of the buffer cylinder are respectively fixedly connected to a first spring and a second spring, the side of the piston rod away from the ring penetrates the inner wall of the buffer cylinder and extends to the outside of the buffer cylinder, and the end of the buffer cylinder away from the ring is fixedly connected to a chain.

[0014] Preferably, the two sides of the piston rod are elastically connected to the inner wall of the buffer cylinder through the first spring and the second spring respectively, the ring is sleeved on the polyethylene anti-corrosion layer on the surface of the arc-shaped steel pipe, the anti-collision pad is against the surface of the polyethylene anti-corrosion layer, and the two ends of the chain are clamped through a semi-circular ring formed by a circular ring and two buckles.

[0015] A method for installing a three-layer PE pipe is as follows:

[0016] S1. First, sleeve the collar on the center of the curved steel pipe, and place the straight steel pipe and the curved steel pipe on the bracket in the groove, then sleeve the first clamp on the end of the straight steel pipe and the curved steel pipe with the outer bevel groove, so that the sealing lip abuts against the outer bevel groove, and then turn the bolt to move the two fixing flanges in a direction close to each other through the thread, so that the inner wall of the first clamp and the inner wall of the first sealing ring abut against the surface of the straight steel pipe and the curved steel pipe, and fix the first clamp on the steel pipe. At this time, the clamping block on the first sealing ring is engaged with the clamping groove. Similarly, sleeve the second clamp on the end of the straight steel pipe and the curved steel pipe with the inner bevel groove, and then turn the bolt to abut the inner wall of the second clamp and the second sealing ring against the surface of the steel pipe, and fix it on the steel pipe;

[0017] S2. Then rotate the straight steel pipe so that the positioning hole on the first clamp is aligned with the positioning rod on the second clamp, and the two buckles are also aligned with each other. At this time, move the straight steel pipe in the direction close to the arc-shaped steel pipe so that the positioning hole is clamped with the positioning rod, the sealing groove is clamped with the sealing strip, and the two sides of the sealing lip are respectively against the outer bevel groove and the inner bevel groove. At the same time, the two buckles are combined to form a semicircular ring. In this process, the circular rings at both ends of the chain are clamped between the two buckles. Then, the gap between the first clamp and the first sealing ring is sealed by welding and the first clamp and the second clamp are fixed to complete the assembly of the PE pipe;

[0018] S3. Finally, the groove is backfilled. When the liquid or gas transported in the pipeline flows along the inclination direction of the sealing lip and impacts the inner wall of the arc-shaped steel pipe, it will first be absorbed by the anti-collision pad and then transmitted to the buffer cylinder on the sleeve ring, so that the piston rod slides inside the buffer cylinder and absorbs the impact force through the first spring and the second spring, while driving the chain to move and consume part of the impact force through movement, and finally transmits the remaining impact force to the buckle ring to offset the impact force on the arc-shaped steel pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention facilitates sealing of the connection between the straight steel pipe and the curved steel pipe by providing the cooperation of the sealing lip and the sealing strip. The straight steel pipe is moved toward the curved steel pipe so that the sealing groove is clamped with the sealing strip, and the two sides of the sealing lip are respectively abutted against the outer inclined groove and the inner inclined groove. The steel pipe connection is sealed by the sealing lip, and the connection between the first clamp and the second clamp and the steel pipe is sealed by the first sealing ring and the second sealing ring. The sealing strip improves the sealing between the first sealing ring and the second sealing ring. The three-level sealing greatly enhances the sealing of the connection to prevent leakage of liquid or gas in the pipeline.

[0021] The present invention facilitates the docking of the straight steel pipe and the arc steel pipe by arranging the cooperation of the first clamp and the second clamp and other structures, fixes the first clamp at the outer bevel groove end of the steel pipe, makes the sealing lip abut against the outer bevel groove, fixes the first sealing ring at the inner bevel groove end of the steel pipe, makes the first sealing ring and the second sealing ring abut against the surface of the steel pipe respectively, then rotates the straight steel pipe to align the positioning hole on the first clamp with the positioning rod on the second clamp, and the two buckles are also aligned with each other, then seals the gap between the first clamp and the first sealing ring by welding, and fixes the first clamp and the second clamp, so that the workers can undertake and install the steel pipe, and avoid the situation that the steel pipe is welded to form a heat shrink band and damage the anti-corrosion layer caused by welding between the steel pipes, and avoids the possibility of welding defects such as misalignment and non-fusion;

[0022] The present invention facilitates the absorption of impact force by arranging the cooperation of structures such as anti-collision pads and chains. When the liquid or gas in the pipeline flows from the straight steel pipe to the inside of the curved steel pipe and causes an impact on the inner wall of the curved steel pipe, the liquid or gas will first be absorbed by the anti-collision pad and then transmitted to the buffer cylinder on the collar. The impact force is absorbed by the first spring and the second spring inside the cushion cylinder, thereby reducing the burden on subsequent components and driving the chain to move and consume part of the impact force through movement. Finally, the remaining impact force is transmitted to the buckle ring to form an antagonistic force with the curved steel pipe, which offsets the impact force on the curved steel pipe, thereby preventing the impact force from causing the curved steel pipe to move away from the straight steel pipe, causing the fixation between the clamp and the curved steel pipe to loosen, thereby enhancing the stability of the connection, thereby extending the service life of the curved steel pipe and the connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the buffer mechanism of the present invention;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the sealing mechanism of the present invention;

[0026] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0027] Figure 5 A schematic diagram of the structural relationship between the positioning rod and the positioning hole of the present invention;

[0028] Figure 6 This is a schematic diagram of the structural relationship between the card block and the card slot of the present invention;

[0029] Figure 7 It is a schematic diagram of the three-layer PE pipe structure of the present invention.

[0030] In the figure: 1. Sealing mechanism; 101. First clamp; 102. First sealing ring; 103. Block; 104. Slot; 105. Sealing lip; 106. Sealing strip; 107. Positioning hole; 108. Fixed flange; 109. Threaded hole; 110. Bolt; 111. Retaining ring; 2. Positioning mechanism; 201. Second clamp; 202. Second sealing ring; 203. Sealing groove; 204. Positioning rod; 3. Three-layer PE pipe mechanism; 301. Straight steel pipe; 302. Arc steel pipe; 303. Outer oblique groove; 304. Inner oblique groove; 305. Adhesive layer; 306. Polyethylene anticorrosion layer; 4. Buffer mechanism; 401. Ring; 402. Anti-collision pad; 403. Buffer cylinder; 404. Piston rod; 405. First spring; 406. Second spring; 407. Chain. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0032] like Figures 1 to 7 As shown, the present invention provides a three-layer PE pipe receiving and installing device, comprising a sealing mechanism 1, a positioning mechanism 2 is arranged on the side of the sealing mechanism 1, a three-layer PE pipe mechanism 3 is arranged inside the sealing mechanism 1 and the positioning mechanism 2, and a buffer mechanism 4 is arranged on the side of the sealing mechanism 1 and the positioning mechanism 2;

[0033] The sealing mechanism 1 includes a first clamp 101, both ends of the first clamp 101 are fixedly connected with a fixing flange 108, the inner wall of the first clamp 101 is fixedly connected with a first sealing ring 102, one end of the first sealing ring 102 is fixedly connected with a clamping block 103, a clamping groove 104 is provided at the end of the first sealing ring 102 away from the clamping block 103, a sealing lip 105 is fixedly connected to the inner wall of the first sealing ring 102, a sealing strip 106 is slidably connected to the side of the first sealing ring 102, a plurality of positioning holes 107 are evenly provided on the side of the first clamp 101 close to the sealing strip 106, a buckle 111 is fixedly connected to the side of the first clamp 101, a threaded hole 109 is provided on one of the fixing flanges 108, and a bolt 110 is threadedly connected to the inner surface of the threaded hole 109.

[0034] The clamping block 103 is clamped with the clamping groove 104, and the outer shape of the buckle 111 is "L"-shaped. A positioning hole 107 is provided at the end of the buckle 111 away from the first clamp 101. The size of the sealing strip 106 is smaller than that of the first sealing ring 102. Several positioning holes 107 are located on the outside of the first sealing ring 102, and the bolts 110 pass through the two fixing flanges 108.

[0035] The positioning mechanism 2 includes a second clamp 201, a second sealing ring 202 is fixedly connected inside the second clamp 201, a sealing groove 203 is opened on the second sealing ring 202, a plurality of positioning rods 204 are fixedly connected to the second clamp 201, a buckle 111 is fixedly connected to the second clamp 201, the size of the second clamp 201 is the same as the size of the second clamp 201, the size of the second sealing ring 202 is the same as the size of the first sealing ring 102, the sealing groove 203 is located on the side of the second clamp 201 close to the first clamp 101, and the plurality of positioning rods 204 are located on the side of the second clamp 201 close to the first clamp 101.

[0036] The size of the sealing strip 106 is matched with the size of the sealing groove 203, and the sealing strip 106 and the sealing groove 203 are clamped together. The size of the positioning rod 204 is matched with the size of the positioning hole 107, and the positioning rod 204 and the positioning hole 107 are clamped together. The buckle 111 on the second clamp 201 is clamped with the buckle 111 on the first clamp 101 through the positioning rod 204, and the two buckle rings 111 are combined to form a semicircular ring.

[0037] The above scheme is adopted: by setting the cooperation of the sealing lip 105 and the sealing strip 106 and other structures, it is convenient to seal the connection between the straight steel pipe 301 and the curved steel pipe 302, and the straight steel pipe 301 is moved in the direction close to the curved steel pipe 302, so that the positioning hole 107 is clamped with the positioning rod 204, the sealing groove 203 is clamped with the sealing strip 106, and the two sides of the sealing lip 105 are respectively against the outer inclined groove 303 and the inner inclined groove 304, the steel pipe connection is sealed by the sealing lip 105, the first clamp 101 and the second clamp 201 and the steel pipe connection are sealed by the first sealing ring 102 and the second sealing ring 202, and the sealing strip 106 improves the sealing between the first sealing ring 102 and the second sealing ring 202, and the three-level sealing greatly enhances the sealing of the connection to prevent liquid or gas leakage in the pipeline;

[0038] By setting the coordination of the first clamp 101 and the second clamp 201 and other structures, it is convenient to dock the straight steel pipe 301 and the arc steel pipe 302. The first clamp 101 is fixed to the end of the outer inclined groove 303 of the steel pipe, so that the sealing lip 105 is against the outer inclined groove 303, and the first sealing ring 102 is fixed to the end of the inner inclined groove 304 of the steel pipe, so that the first sealing ring 102 and the second sealing ring 202 are respectively against the surface of the steel pipe, and then the straight steel pipe 301 is rotated to make the positioning on the first clamp 101 The hole 107 is aligned with the positioning rod 204 on the second clamp 201, and the two buckles 111 are also aligned with each other. Then, the gap between the first clamp 101 and the first sealing ring 102 is sealed by welding, and the first clamp 101 and the second clamp 201 are fixed, so that the workers can easily undertake the installation of the steel pipe, and avoid the direct welding of the steel pipe, which may cause the formation of heat shrinkage bands on the steel pipe and damage the anti-corrosion layer, and avoid the possible occurrence of welding defects such as misalignment and unfusion.

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, the three-layer PE pipe mechanism 3 includes a straight steel pipe 301 and an arc-shaped steel pipe 302, and the two ends of the straight steel pipe 301 and the arc-shaped steel pipe 302 are respectively provided with an outer bevel groove 303 and an inner bevel groove 304, the surfaces of the straight steel pipe 301 and the arc-shaped steel pipe 302 are fixedly connected to the polyethylene anti-corrosion layer 306 through an adhesive layer 305, the size of the outer bevel groove 303 is adapted to the size of the inner bevel groove 304, the first clamp 101 is sleeved on one end of the straight steel pipe 301 and the arc-shaped steel pipe 302 with the outer bevel groove 303, the second clamp 201 is sleeved on one end of the straight steel pipe 301 and the arc-shaped steel pipe 302 with the inner bevel groove 304, the first sealing ring 102 and the second sealing ring 202 are against the surface of the straight steel pipe 301 and the arc-shaped steel pipe 302, and the sealing lip 105 is located between the outer bevel groove 303 and the inner bevel groove 304.

[0040] The buffer mechanism 4 includes a collar 401, an inner wall of the collar 401 is fixedly connected with an anti-collision pad 402, a side of the collar 401 is fixedly connected with a buffer cylinder 403, a piston rod 404 is slidably connected inside the buffer cylinder 403, a first spring 405 and a second spring 406 are fixedly connected to the two sides of the inner wall of the buffer cylinder 403, a side of the piston rod 404 away from the collar 401 passes through the inner wall of the buffer cylinder 403 and extends to the outside of the buffer cylinder 403, a chain 407 is fixedly connected to the end of the buffer cylinder 403 away from the collar 401, and the two sides of the piston rod 404 are elastically connected to the inner wall of the buffer cylinder 403 through the first spring 405 and the second spring 406, the collar 401 is sleeved on the polyethylene anti-corrosion layer 306 on the surface of the arc-shaped steel pipe 302, the anti-collision pad 402 is against the surface of the polyethylene anti-corrosion layer 306, and the two ends of the chain 407 are clamped with a semicircular ring formed by a circular ring and two buckles 111.

[0041] The above scheme is adopted: by arranging the anti-collision pad 402 and the chain 407 and other structures, it is convenient to absorb the impact force. When the liquid or gas in the pipeline flows from the straight steel pipe 301 to the inside of the curved steel pipe 302 and causes an impact on the inner wall of the curved steel pipe 302, it will first be absorbed by the anti-collision pad 402 and then transmitted to the buffer cylinder 403 on the collar 401, so that the piston rod 404 slides inside the buffer cylinder 403, and the impact force is absorbed by the first spring 405 and the second spring 406, thereby reducing the back The burden of the follow-up components is relieved, while driving the chain 407 to move and consume part of the impact force through movement, and finally transmitting the remaining impact force to the buckle 111, forming an antagonistic force with the arc steel pipe 302, so that the impact force on the arc steel pipe 302 is offset, avoiding the impact force causing the arc steel pipe 302 to move away from the straight steel pipe 301, causing the fixation between the clamp and the arc steel pipe 302 to loosen, thereby enhancing the stability of the connection, thereby extending the service life of the arc steel pipe 302 and the connection structure.

[0042] A method for installing a three-layer PE pipe is as follows:

[0043] S1. First, sleeve the collar 401 on the center of the curved steel pipe 302, and place the straight steel pipe 301 and the curved steel pipe 302 on the bracket in the groove, then sleeve the first clamp 101 on one end of the straight steel pipe 301 and the curved steel pipe 302 with the outer inclined groove 303, so that the sealing lip 105 abuts against the outer inclined groove 303, and then turn the bolt 110 through the thread to move the two fixing flanges 108 in a direction close to each other, so that the inner wall of the first clamp 101 and The inner wall of the first sealing ring 102 is abutted against the surface of the straight steel pipe 301 and the curved steel pipe 302, and the first clamp 101 is fixed on the steel pipe. At this time, the clamping block 103 on the first sealing ring 102 is clamped with the clamping groove 104. Similarly, the second clamp 201 is sleeved on the end of the straight steel pipe 301 and the curved steel pipe 302 with the inner inclined groove 304, and then the bolt 110 is rotated to make the inner wall of the second clamp 201 and the second sealing ring 202 abut against the surface of the steel pipe, and fix it on the steel pipe;

[0044] S2, then rotate the straight steel pipe 301 to align the positioning hole 107 on the first clamp 101 with the positioning rod 204 on the second clamp 201, and the two buckles 111 are also aligned with each other. At this time, move the straight steel pipe 301 in the direction close to the arc-shaped steel pipe 302, so that the positioning hole 107 is engaged with the positioning rod 204, the sealing groove 203 is engaged with the sealing strip 106, and the two sides of the sealing lip 105 are respectively against the outer inclined groove 303 and the inner inclined groove 304. At the same time, the two buckles 111 are combined to form a semicircular ring. In this process, the circular rings at both ends of the chain 407 are engaged between the two buckles 111, and then the gap between the first clamp 101 and the first sealing ring 102 is sealed by welding, and the first clamp 101 and the second clamp 201 are fixed to complete the assembly of the PE pipe;

[0045] S3. Finally, the groove is backfilled. When the liquid or gas transported in the pipeline flows along the inclined direction of the sealing lip 105 and impacts the inner wall of the arc-shaped steel pipe 302, it will first be absorbed by the anti-collision pad 402 and then transmitted to the buffer cylinder 403 on the ring 401, so that the piston rod 404 slides inside the buffer cylinder 403, and the impact force is absorbed by the first spring 405 and the second spring 406, while driving the chain 407 to move and consume part of the impact force through movement, and finally transmit the remaining impact force to the buckle 111, so that it offsets the impact force on the arc-shaped steel pipe 302.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-layer PE pipe receiving and installing device, comprising a sealing mechanism (1), characterized in that: A positioning mechanism (2) is arranged on the side of the sealing mechanism (1), a three-layer PE pipe mechanism (3) is arranged inside the sealing mechanism (1) and the positioning mechanism (2), and a buffer mechanism (4) is arranged on the side of the sealing mechanism (1) and the positioning mechanism (2); The sealing mechanism (1) comprises a first clamp (101), both ends of the first clamp (101) are fixedly connected with fixing flanges (108), the inner wall of the first clamp (101) is fixedly connected with a first sealing ring (102), one end of the first sealing ring (102) is fixedly connected with a clamping block (103), a clamping groove (104) is provided at the end of the first sealing ring (102) away from the clamping block (103), the inner wall of the first sealing ring (102) is fixedly connected with a sealing lip (105), the side of the first sealing ring (102) is slidably connected with a sealing strip (106), a side of the first clamp (101) close to the sealing strip (106) is evenly provided with a plurality of positioning holes (107), the side of the first clamp (101) is fixedly connected with a buckle (111), one of the fixing flanges (108) is provided with a threaded hole (109), and the inner thread of the threaded hole (109) is threadedly connected with a bolt (110).

2. The three-layer PE pipe receiving and installing device according to claim 1 is characterized in that: The clamping block (103) is clamped with the clamping groove (104); the buckle (111) has an "L" shape; a positioning hole (107) is provided at one end of the buckle (111) away from the first clamp (101); the size of the sealing strip (106) is smaller than the size of the first sealing ring (102); the plurality of positioning holes (107) are located on the outside of the first sealing ring (102); and the bolt (110) passes through two fixing flanges (108).

3. The three-layer PE pipe receiving and installing device according to claim 1 is characterized in that: The positioning mechanism (2) comprises a second clamp (201), a second sealing ring (202) is fixedly connected inside the second clamp (201), a sealing groove (203) is provided on the second sealing ring (202), and a plurality of positioning rods (204) are fixedly connected to the second clamp (201).

4. The three-layer PE pipe receiving and installing device according to claim 3 is characterized in that: A buckle ring (111) is fixedly connected to the second clamp (201); the size of the second clamp (201) is the same as that of the first clamp (201); the size of the second sealing ring (202) is the same as that of the first sealing ring (102); the sealing groove (203) is located on a side of the second clamp (201) close to the first clamp (101); and a plurality of positioning rods (204) are located on a side of the second clamp (201) close to the first clamp (101).

5. The three-layer PE pipe receiving and installing device according to claim 3 is characterized in that: The size of the sealing strip (106) is matched with the size of the sealing groove (203), and the sealing strip (106) and the sealing groove (203) are clamped together. The size of the positioning rod (204) is matched with the size of the positioning hole (107), and the positioning rod (204) and the positioning hole (107) are clamped together. The buckle (111) on the second clamp (201) is clamped with the buckle (111) on the first clamp (101) through the positioning rod (204), and the two buckle rings (111) are combined to form a semicircular ring.

6. The three-layer PE pipe receiving and installing device according to claim 3 is characterized in that: The three-layer PE pipe structure (3) comprises a straight steel pipe (301) and an arc-shaped steel pipe (302), and the two ends of the straight steel pipe (301) and the arc-shaped steel pipe (302) are respectively provided with an outer inclined groove (303) and an inner inclined groove (304), and the surfaces of the straight steel pipe (301) and the arc-shaped steel pipe (302) are fixedly connected to the polyethylene anti-corrosion layer (306) through an adhesive layer (305).

7. The three-layer PE pipe receiving and installing device according to claim 6 is characterized in that: The size of the outer bevel groove (303) is matched with the size of the inner bevel groove (304); the first clamp (101) is sleeved on one end of the straight steel pipe (301) and the arc-shaped steel pipe (302) where the outer bevel groove (303) is opened; the second clamp (201) is sleeved on one end of the straight steel pipe (301) and the arc-shaped steel pipe (302) where the inner bevel groove (304) is opened; the first sealing ring (102) and the second sealing ring (202) are abutted against the surface of the straight steel pipe (301) and the arc-shaped steel pipe (302); and the sealing lip (105) is located between the outer bevel groove (303) and the inner bevel groove (304).

8. The three-layer PE pipe receiving and installing device according to claim 6 is characterized in that: The buffer mechanism (4) comprises a collar (401), the inner wall of the collar (401) is fixedly connected with an anti-collision pad (402), the side of the collar (401) is fixedly connected with a buffer cylinder (403), the interior of the buffer cylinder (403) is slidably connected with a piston rod (404), the two sides of the inner wall of the buffer cylinder (403) are respectively fixedly connected with a first spring (405) and a second spring (406), the side of the piston rod (404) away from the collar (401) passes through the inner wall of the buffer cylinder (403) and extends to the outside of the buffer cylinder (403), and the end of the buffer cylinder (403) away from the collar (401) is fixedly connected with a chain (407).

9. The three-layer PE pipe receiving and installing device according to claim 8 is characterized in that: The two sides of the piston rod (404) are elastically connected to the inner wall of the buffer cylinder (403) through the first spring (405) and the second spring (406), respectively; the collar (401) is sleeved on the polyethylene anti-corrosion layer (306) on the surface of the arc-shaped steel pipe (302); the anti-collision pad (402) is against the surface of the polyethylene anti-corrosion layer (306); and the two ends of the chain (407) are clamped by a semicircular ring formed by a circular ring and two buckling rings (111).

10. A method for connecting and installing a three-layer PE pipe, applied to a device for connecting and installing a three-layer PE pipe according to claims 1-9, characterized in that: The installation method is as follows: S1. First, the collar (401) is sleeved on the center of the curved steel pipe (302), and the straight steel pipe (301) and the curved steel pipe (302) are placed on the bracket in the groove. Then, the first clamp (101) is sleeved on one end of the straight steel pipe (301) and the curved steel pipe (302) with the outer inclined groove (303) so that the sealing lip (105) and the outer inclined groove (303) are abutted. Then, the bolt (110) is turned to move the two fixing flanges (108) toward each other through the thread, so that the inner wall of the first clamp (101) and the inner wall of the first clamp (101) are close to each other. The inner wall of a sealing ring (102) is pressed against the surface of the straight steel pipe (301) and the curved steel pipe (302), and the first clamp (101) is fixed on the steel pipe. At this time, the clamping block (103) on the first sealing ring (102) is clamped with the clamping groove (104). Similarly, the second clamp (201) is sleeved on one end of the straight steel pipe (301) and the curved steel pipe (302) with the inner inclined groove (304). Then, the bolt (110) is rotated to press the inner wall of the second clamp (201) and the second sealing ring (202) against the surface of the steel pipe, and fix them on the steel pipe. S2, then rotate the straight steel pipe (301) so that the positioning hole (107) on the first clamp (101) is aligned with the positioning rod (204) on the second clamp (201), and the two buckles (111) are also aligned with each other. At this time, move the straight steel pipe (301) toward the arc-shaped steel pipe (302), so that the positioning hole (107) is engaged with the positioning rod (204), the sealing groove (203) is engaged with the sealing strip (106), and the sealing lip (105) is engaged with the sealing strip (106). ) are respectively abutted against the outer inclined groove (303) and the inner inclined groove (304), and at the same time, the two buckles (111) are combined to form a semicircular ring. In this process, the circular rings at both ends of the chain (407) are clamped between the two buckles (111), and then the gap between the first clamp (101) and the first sealing ring (102) is sealed by welding and the first clamp (101) and the second clamp (201) are fixed, thereby completing the assembly of the PE pipe; S3. Finally, the groove is backfilled. When the liquid or gas transported in the pipeline flows along the inclined direction of the sealing lip (105) and impacts the inner wall of the arc-shaped steel pipe (302), it will first be absorbed by the anti-collision pad (402) and then transmitted to the buffer cylinder (403) on the ring (401), so that the piston rod (404) slides inside the buffer cylinder (403) and absorbs the impact force through the first spring (405) and the second spring (406), while driving the chain (407) to move and consume part of the impact force through movement, and finally transmit the remaining impact force to the buckle (111) to offset the impact force on the arc-shaped steel pipe (302).

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