Grinding device and method for polyethylene pipe production

Abstract

The invention discloses a grinding device and method for polyethylene pipe production, relates to the technical field of grinding devices, and aims to solve the technical problem that in the prior art, the surface of a polyethylene pipe fitting is subjected to grinding treatment, so that the welding tightness of the polyethylene pipe fitting and an electric melting pipe fitting is insufficient, and the grinding device comprises the pipe fitting of which one end is detachably provided with a grinding mechanism; the grinding mechanism comprises a grinding assembly used for conducting spiral cutting on the surface of the end of the pipe fitting. The grinding assembly comprises an L-shaped support with a mounting groove formed in one end, a first sliding block is movably arranged in the mounting groove, a second rotary knob is rotatably mounted at the top of the first sliding block, and a second threaded rod which is in threaded fit with the second rotary knob and penetrates out of the first sliding block is arranged in the middle of the bottom of the second rotary knob. A grinding cutter is detachably mounted at the bottom end of the second threaded rod. The device has the advantage that the polyethylene pipe fitting is ground so as to improve the welding tightness of the polyethylene pipe fitting and the electric melting pipe fitting.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding devices, and more specifically, to a grinding device and method for polyethylene pipe production. Background Art

[0002] In the connection application of polyethylene pipe fittings and electrofusion pipe fittings, the quality of the fusion directly affects the overall performance of the pipeline system. The existing polyethylene pipe grinding processing technology cannot meet the requirement of improving the fusion tightness to a great extent. The current grinding methods mostly use conventional grinding wheel grinding equipment, and the grinding parameters are mainly controlled by the experience of workers during operation. In this mode, it is difficult to accurately control the grinding depth, and the grinding uniformity of the surface of the pipe fittings is poor. Moreover, the existing grinding processing only focuses on removing impurities or minor defects on the surface of the pipe fittings, and is not designed from the perspectives of fusion tightness and prestress introduction. During the fusion process, due to the lack of special structures on the surface of the pipe fittings, it is impossible to achieve close fitting with the electrofusion pipe fittings. In view of this, we propose a grinding device and method for polyethylene pipe production. Summary of the Invention

[0003] The purpose of the present invention is to provide a grinding device and method for polyethylene pipe production, so as to solve the technical problem in the prior art that the grinding treatment of the surface of polyethylene pipe fittings is likely to lead to insufficient fusion tightness with electrofusion pipe fittings.

[0004] To solve the above technical problem, the present invention provides the following technical solution: A grinding device for polyethylene pipe production, including a pipe fitting with a grinding mechanism detachably arranged at one end; The grinding mechanism includes a grinding assembly for helically cutting the surface of the end of the pipe fitting; The grinding assembly includes an L-shaped bracket with an installation groove formed inside one end. A slider one is movably arranged in the installation groove. A knob two is rotatably installed on the top of the slider one. A threaded rod two that is in threaded fit and passes through the slider one is constructed in the center at the bottom of the knob two. A grinding tool is detachably installed at the bottom end of the threaded rod two; A laser distance sensor one for measuring the distance between the knob two and its surface to determine the cutting depth of the grinding tool is arranged on the top of the slider one. A laser distance sensor two for measuring the moving distance of the slider one is arranged on the side of the inner wall of the installation groove away from the knob one. A parameter input module and a buzzer alarm for when the grinding tool descends in place and the slider one moves in place are arranged on one side of the L-shaped bracket; The pipe fitting includes a polyethylene pipe, and a filling groove and a filling part are formed on the surface of one end of the polyethylene pipe.

[0005] Preferably, one end of the L-shaped bracket is rotatably installed with a first knob. The first knob is fixedly connected to a first lead screw rotatably installed in the installation groove. The first slider is movably installed on the outer edge surface of the first lead screw. A positioning rod is fixedly arranged inside the installation groove. A shaft hole adapted to the sliding arrangement of the positioning rod is formed inside the first slider.

[0006] Preferably, a handle is fixedly arranged at the top of one side of the L-shaped bracket away from the first knob, and a fixed seat is fixedly arranged on the side of the L-shaped bracket away from the handle. A first threaded rod is fixedly arranged inside the fixed seat.

[0007] Preferably, the grinding mechanism further includes an inner support assembly for supporting and fixing the inner wall of the polyethylene pipe. The inner support assembly includes an outer cylinder body with a second lead screw rotatably installed inside. One end of the second lead screw extends out of the outer cylinder body and is fixedly connected to a rotating seat. Through holes for the first threaded rod to pass through are formed inside both the second lead screw and the rotating seat. One end of the first threaded rod extends out of the second lead screw and the rotating seat and is in threaded fit connection with the outer cylinder body. A plurality of dial holes are formed in an annular array on the outer edge surface of the rotating seat.

[0008] Preferably, a plurality of limiting grooves are formed in an annular array on the outer edge surface of the outer cylinder body. A second slider is movably installed on the outer edge surface of the second lead screw. U-shaped seats are symmetrically formed on the four side surfaces of the second slider. An inner support plate one is rotatably installed between the U-shaped seats. A hollow groove is formed inside the inner support plate one.

[0009] Preferably, U-shaped plates are symmetrically formed in an annular array on the inner wall of one end of the outer cylinder body facing the rotating seat. An inner support plate two is rotatably installed between the U-shaped plates. The inner support plate two passes out of the hollow groove. The inner support plate two and the center position of the hollow groove are rotationally connected through a rotating shaft. Both the inner support plate two and one end of the hollow groove pass out of the limiting groove and are movably abutted against the inner surface of the polyethylene pipe.

[0010] Preferably, the filling groove is a groove structure formed by the intersection of a plurality of forward and reverse spiral groove bodies. The filling part is in a diamond structure. The first laser distance sensor and the second laser distance sensor are electrically connected to the parameter input module and the buzzer alarm. A semi-circular groove body is formed at the bottom end of the grinding tool.

[0011] A grinding method for the production of polyethylene pipes includes the following steps: S1. Insert the inner support assembly into one end inside the polyethylene pipe whose surface needs to be cut. Insert an external insertion rod into the dial hole and rotate it, so that the second lead screw rotates and drives the second slider to move. The movement of the second slider drives the U-shaped seat to move and pushes the inner support plate one and the inner support plate two to move relatively, so that the ends of the inner support plate one and the inner support plate two abut against the inner wall of the polyethylene pipe, realizing the support for the inner wall of the polyethylene pipe. S2. Input the axial length to be cut on the surface of the polyethylene pipe , the diameter of the polyethylene pipe , the number of spiral turns of the filling groove into the parameter input module, and calculate the total volume of the groove structure formed by the intersection of several forward and reverse spiral grooves and the total volume of the filling part through the parameter input module, and make the total volume of the filling groove equal to that of the filling part, and calculate the grinding depth of the grinding tool when it descends for grinding and the axial spacing of several forward and reverse spiral grooves of the first slider ; S3. After the calculation is completed, hold the handle and rotate it to move the grinding tool to the initial position to be cut on the surface of the polyethylene pipe, and rotate the second threaded rod by turning the second knob to drive the grinding tool to move down, and measure the distance between the second knob and the first slider through the first laser distance sensor. When the grinding tool descends in place, that is, when the grinding depth is in place, trigger the buzzer alarm to alarm, stop turning the second knob, then hold the handle and rotate it, cut the first spiral groove on the surface of the polyethylene pipe through the grinding tool, reverse-turn the second knob to make the grinding tool disengage from the first spiral groove, hold the handle and rotate it in the reverse direction to make the grinding tool reset, and then turn the second knob to rotate the second threaded rod to drive the grinding tool to move down in place; S4. Then rotate the first knob to rotate the first lead screw and drive the first slider to move, measure the distance between it and the first slider through the second laser distance sensor. When the first slider moves in place, trigger the buzzer alarm to alarm, then hold the handle and rotate it, cut the second spiral groove on the surface of the polyethylene pipe through the grinding tool, and the distance between the second spiral groove and the first spiral groove is ; reverse-turn the second knob to make the grinding tool disengage from the second spiral groove, hold the handle and rotate it in the reverse direction to make the grinding tool reset, and then turn the second knob to rotate the second threaded rod to drive the grinding tool to move down in place; S5. Then rotate the first knob to rotate the first lead screw and drive the first slider to move, measure the distance between it and the first slider through the second laser distance sensor. When the first slider moves in place, trigger the buzzer alarm to alarm, then hold the handle and rotate it, cut the third spiral groove on the surface of the polyethylene pipe through the grinding tool, and the distance between the third spiral groove and the second spiral groove is ; S6. Then hold the handle and rotate it in the reverse direction, repeat the steps in S3 above to form the first reverse spiral groove, the second reverse spiral groove and the third reverse spiral groove with an axial spacing of , so as to form a filling groove and a filling part on the surface of the polyethylene pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention forms a filling groove on the surface of a polyethylene pipe by grinding a tool. The filling groove has a groove structure formed by the intersection of a number of forward and reverse spiral grooves, and a filling part is formed on the surface of the polyethylene pipe. When the polyethylene pipe is inserted into an electrofusion fitting for welding, the filling part can promote the close fitting of the polyethylene pipe and the fitting, introduce prestress on the surface of the polyethylene pipe, effectively solve the problem of insufficient welding tightness in the prior art, greatly improve the sealing performance at the joint, and significantly reduce the risk of medium leakage.

[0013] 2. The present invention introduces prestress on the surface of the polyethylene pipe through grinding processing, and the filling groove and the filling part cooperate with each other. When the polyethylene pipe is inserted into the electrofusion fitting for welding, the filling part melts and fills the filling groove. At the same time, excess material is formed by the melting and welding on the inner wall of the electrofusion fitting. The excess material is extruded from the gap on the inner wall of the electrofusion fitting under the action of pressure and is distributed at the connection position between the electrofusion fitting and the polyethylene pipe, thereby forming a further sealing effect, significantly improving the mechanical strength of the joint after welding. Compared with the traditional welding method, the connection between fittings is more firm, can better withstand pressure and external forces, greatly reduces the possibility of loosening and cracking at the joint, effectively extends the service life of the pipeline system, and comprehensively improves the overall safety.

[0014] 3. The present invention also forms a filling part on the surface of the polyethylene pipe through grinding processing, reducing the contact area between the polyethylene pipe and the inner wall of the electrofusion fitting when the polyethylene pipe is inserted, making it easier for the polyethylene pipe to be inserted into the electrofusion fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the grinding mechanism of the present invention; Figure 3 is a schematic structural diagram of the inner support assembly of the present invention; Figure 4 is a cross-sectional view of the inner support assembly of the present invention; Figure 5 is a schematic structural diagram of the grinding assembly of the present invention; Figure 6 is a top view of the grinding assembly of the present invention; Figure 7 For the present invention Figure 5 is an enlarged schematic view of the structure at A in; Figure 8 For the present invention Figure 6 is an enlarged schematic view of the structure at B in; Figure 9 is a top view of the fitting of the present invention.

[0016] Explanation of the reference numerals in the drawings: 1. Pipe fitting; 101. Polyethylene pipe; 102. Filling groove; 103. Filling part; 2. Grinding mechanism; 3. Grinding assembly; 301. L-shaped bracket; 302. Handle; 303. Fixed seat; 304. First threaded rod; 305. Installation groove; 306. First lead screw; 307. Positioning rod; 308. First knob; 309. First slider; 310. Second knob; 311. Second threaded rod; 312. Grinding tool; 4. Inner support assembly; 401. Rotating seat; 402. Dial hole; 403. Second lead screw; 404. Second slider; 405. U-shaped seat; 406. First inner support plate; 407. Hollow groove; 408. U-shaped plate; 409. Second inner support plate; 410. Outer cylinder; 411. Limit groove. Detailed implementation mode

[0017] Example 1, as Figures 1 to 9 shown, a grinding device for the production of polyethylene pipes according to the present invention includes a pipe fitting 1 with a grinding mechanism 2 detachably arranged at one end; The grinding mechanism 2 includes a grinding assembly 3 for helically cutting the end surface of the pipe fitting 1; The grinding assembly 3 includes an L-shaped bracket 301 with an installation groove 305 formed inside one end, a first slider 309 movably arranged in the installation groove 305, a second knob 310 rotatably installed on the top of the first slider 309, a second threaded rod 311 with a threaded fit and passing through the first slider 309 centered at the bottom of the second knob 310, and a grinding tool 312 detachably installed at the bottom end of the second threaded rod 311; A first laser distance sensor for measuring the distance between the second knob 310 and its surface to determine the cutting depth of the grinding tool 312 is arranged on the top of the first slider 309, a second laser distance sensor for measuring the moving distance of the first slider 309 is arranged on one side of the inner wall of the installation groove 305 away from the first knob 308, a parameter input module and a buzzer alarm for when the grinding tool 312 descends in place and the first slider 309 moves in place are arranged on one side of the L-shaped bracket 301; The pipe fitting 1 includes a polyethylene pipe 101, and a filling groove 102 and a filling part 103 are formed on the surface of one end of the polyethylene pipe 101.

[0018] The present invention forms a filling groove on the surface of the polyethylene pipe by grinding with a grinding tool, and the filling groove is a groove structure formed by the intersection of several forward and reverse spiral grooves, and a filling part is formed on the surface of the polyethylene pipe. When the polyethylene pipe is inserted into the electrofusion pipe fitting for welding, the filling part can promote the close fit of the polyethylene pipe and the pipe fitting, and introduce prestress on the surface of the polyethylene pipe.

[0019] In an embodiment of the present invention, one end of the L-shaped bracket 301 is rotatably installed with a first knob 308. The first knob 308 is fixedly connected to a first lead screw 306 that is rotatably installed in the installation groove 305. The first slider 309 is movably installed on the outer edge surface of the first lead screw 306. A positioning rod 307 is fixedly arranged inside the installation groove 305, and a shaft hole adapted to the sliding arrangement of the positioning rod 307 is formed inside the first slider 309.

[0020] In an embodiment of the present invention, a handle 302 is fixedly arranged at the top of one side of the L-shaped bracket 301 away from the first knob 308, and a fixed seat 303 is fixedly arranged on the side of the L-shaped bracket 301 away from the handle 302. A first threaded rod 304 is fixedly arranged inside the fixed seat 303.

[0021] In an embodiment of the present invention, the grinding mechanism 2 further includes an inner support assembly 4 for supporting and fixing the inner wall of the polyethylene pipe 101. The inner support assembly 4 includes an outer cylinder 410 with a second lead screw 403 rotatably installed inside. One end of the second lead screw 403 extends out of the outer cylinder 410 and is fixedly connected to a rotating seat 401. Through holes for the first threaded rod 304 to pass through are formed inside both the second lead screw 403 and the rotating seat 401. One end of the first threaded rod 304 extends out of the second lead screw 403 and the rotating seat 401 and is in threaded fit connection with the outer cylinder 410. Dial holes 402 are formed in an annular array on the outer edge surface of the rotating seat 401.

[0022] In an embodiment of the present invention, limiting grooves 411 are formed in an annular array on the outer edge surface of the outer cylinder 410. A second slider 404 is movably installed on the outer edge surface of the second lead screw 403. U-shaped seats 405 are symmetrically formed on the four side surfaces of the second slider 404. An inner support plate one 406 is rotatably installed between the U-shaped seats 405. A hollow groove 407 is formed inside the inner support plate one 406.

[0023] In an embodiment of the present invention, U-shaped plates 408 are symmetrically formed in an annular array on the inner wall of one end of the outer cylinder 410 facing the rotating seat 401. An inner support plate two 409 is rotatably installed between the U-shaped plates 408. The inner support plate two 409 passes out of the hollow groove 407, and the inner support plate two 409 and the center position of the hollow groove 407 are rotatably connected through a rotating shaft. Both the inner support plate two 409 and one end of the hollow groove 407 pass out of the limiting groove 411 and are in movable contact with the inner surface of the polyethylene pipe 101.

[0024] In an embodiment of the present invention, the filling groove 102 is a groove structure formed by the intersection of a number of forward and reverse spiral grooves, the filling portion 103 has a diamond structure, the first laser distance sensor and the second laser distance sensor are electrically connected to the parameter input module and the buzzer alarm, and a semi-circular groove is formed at the bottom end of the grinding tool 312.

[0025] Embodiment 2: A grinding method for the production of polyethylene pipes, comprising the following steps: S1. Insert the inner support assembly 4 into one end of the polyethylene pipe 101 where its surface needs to be cut. Insert an external insertion rod into the dial hole 402 and rotate it, so that the second lead screw 403 rotates and drives the second slider 404 to move. The movement of the second slider 404 drives the U-shaped seat 405 to move and pushes the first inner support plate 406 and the second inner support plate 409 to move relatively, so that the ends of the first inner support plate 406 and the second inner support plate 409 abut against the inner wall of the polyethylene pipe 101, realizing the support of the inner wall of the polyethylene pipe 101. S2. Input the axial length to be cut on the surface of the polyethylene pipe 101 , the diameter of the polyethylene pipe 101 , the number of spiral turns of the filling groove 102 into the parameter input module, and calculate the total volume of the groove structure formed by the intersection of a number of forward and reverse spiral grooves and the total volume of the filling portion 103 through the parameter input module, and make the total volume of the filling groove 102 equal to the total volume of the filling portion 103, and calculate the grinding depth of the grinding tool 312 when it descends for grinding and the axial spacing of a number of forward and reverse spiral grooves of the first slider 309 ; S3. After the calculation is completed, hold the handle 302 and rotate it to move the grinding tool 312 to the initial position where the surface of the polyethylene pipe 101 needs to be cut, and rotate the second threaded rod 311 by turning the second knob 310 to drive the grinding tool 312 to move downward, and measure the distance between the second knob 310 and the first slider 309 through the first laser distance sensor. When the grinding tool 312 descends in place, that is, when the grinding depth is in place, trigger the buzzer alarm to alarm, stop turning the second knob 310, then hold the handle 302 and rotate it to cut a first spiral groove on the surface of the polyethylene pipe 101 through the grinding tool 312, reverse-turn the second knob 310 to make the grinding tool 312 disengage from the first spiral groove, hold the handle 302 and rotate it in the reverse direction to reset the grinding tool 312, and then turn the second knob 310 to rotate the second threaded rod 311 to drive the grinding tool 312 to move downward in place; S4. Then, by rotating the first knob 308, the first lead screw 306 rotates to drive the first slider 309 to move. The distance between the second laser distance sensor and the first slider 309 is measured. When the first slider 309 moves in place, the buzzer alarm is triggered. Then, hold the handle 302 and rotate it. The grinding tool 312 cuts on the surface of the polyethylene pipe 101 to form a second spiral groove with a spacing from the first spiral groove of . Reverse the rotation of the second knob 310 to disengage the grinding tool 312 from the second spiral groove. Hold the handle 302 and rotate it in the reverse direction to reset the grinding tool 312. Then, turn the second knob 310 to rotate the second threaded rod 311 and drive the grinding tool 312 to move down in place; S5. Then, rotate the first knob 308 to rotate the first lead screw 306 and drive the first slider 309 to move. The distance between the second laser distance sensor and the first slider 309 is measured. When the first slider 309 moves in place, the buzzer alarm is triggered. Then, hold the handle 302 and rotate it. The grinding tool 312 cuts on the surface of the polyethylene pipe 101 to form a third spiral groove with a spacing from the second spiral groove of ; S6. Then, hold the handle 302 and rotate it in the reverse direction, and repeat the steps in S3 to form a first reverse spiral groove, a second reverse spiral groove, and a third reverse spiral groove with an axial spacing of , thereby forming a filling groove 102 and a filling portion 103 on the surface of the polyethylene pipe 101.

[0026] In the embodiment of the present invention, the calculation methods for the grinding depth and the axial spacing are as follows: Calculate the cross-sectional area of a single spiral groove , ; Calculate the length of a single spiral groove ; Calculate the total volume of the filling portion 103 , ; Calculate the total volume of the filling groove 102 , ; Another , that is ; wherein, is the radius of the semi-circular groove at the bottom end of the grinding tool 312; Solve to obtain , .

[0027] The present invention introduces prestress on the surface of the polyethylene pipe through grinding processing, and the filling groove and the filling part cooperate with each other. When the polyethylene pipe is inserted into the electrofusion fitting for welding, the filling part is welded and fills the filling groove. At the same time, excess material is formed by the welding of the inner wall of the electrofusion fitting. Under the action of pressure, the excess material is extruded from the gap on the inner wall of the electrofusion fitting and distributed at the connection position between the electrofusion fitting and the polyethylene pipe, thereby forming a further sealing effect, significantly improving the mechanical strength of the welded joint. Compared with the traditional welding method, the connection between fittings is more firm, can better withstand pressure and external forces, greatly reduces the possibility of loosening and rupture at the joint, effectively extends the service life of the pipeline system, and comprehensively improves the overall safety.

[0028] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A grinding device for the production of polyethylene pipes, characterized in that, A pipe fitting (1) with a grinding mechanism (2) detachably arranged at one end; The grinding mechanism (2) includes a grinding assembly (3) for helically cutting the end surface of the pipe fitting (1); The grinding assembly (3) includes an L-shaped bracket (301) with an installation groove (305) formed inside one end. A first slider (309) is movably arranged in the installation groove (305). A knob two (310) is rotatably installed at the top of the first slider (309). A threaded rod two (311) that is threadedly engaged and passes through the first slider (309) is constructed in the center at the bottom of the knob two (310). A grinding tool (312) is detachably installed at the bottom end of the threaded rod two (311); A first laser distance sensor for measuring the distance between the knob two (310) and its surface to determine the cutting depth of the grinding tool (312) is arranged at the top of the first slider (309). A second laser distance sensor for measuring the moving distance of the first slider (309) is arranged on one side of the inner wall of the installation groove (305) away from the knob one (308). A parameter input module and a buzzer alarm for when the grinding tool (312) descends in place and the first slider (309) moves in place are arranged on one side of the L-shaped bracket (301); The pipe fitting (1) includes a polyethylene pipe (101), and a filling groove (102) and a filling portion (103) are formed on the surface of one end of the polyethylene pipe (101).

2. The grinding device for polyethylene pipe production according to claim 1, characterized in that, A knob one (308) is rotatably installed at one end of the L-shaped bracket (301). The knob one (308) is fixedly connected to a first lead screw (306) rotatably installed in the installation groove (305). The first slider (309) is movably installed on the outer edge surface of the first lead screw (306). A positioning rod (307) is fixedly arranged inside the installation groove (305). A shaft hole adapted for the positioning rod (307) to slide through is formed inside the first slider (309).

3. A grinding device for the production of polyethylene pipes according to claim 2, characterized in that, A handle (302) is fixedly arranged at the top of one side of the L-shaped bracket (301) away from the knob one (308), and a fixed seat (303) is fixedly arranged on the other side of the L-shaped bracket (301) away from the handle (302). A threaded rod one (304) is fixedly arranged inside the fixed seat (303).

4. A grinding device for polyethylene pipe production according to claim 3, characterized in that, The grinding mechanism (2) further includes an inner support assembly (4) for supporting and fixing the inner wall of the polyethylene pipe (101). The inner support assembly (4) includes an outer cylinder (410) with a second lead screw (403) rotatably installed inside. One end of the second lead screw (403) extends out of the outer cylinder (410) and is fixedly connected to a rotating seat (401). Through holes for the threaded rod one (304) to pass through are formed inside both the second lead screw (403) and the rotating seat (401). One end of the threaded rod one (304) extends out of the second lead screw (403) and the rotating seat (401) and is threadedly engaged and connected with the outer cylinder (410). Dial holes (402) are formed in an annular array on the outer edge surface of the rotating seat (401).

5. A grinding device for polyethylene pipe production according to claim 4, characterized in that, A limiting groove (411) is formed in a circular array on the outer edge surface of the outer cylinder body (410). A second slider (404) is movably mounted on the outer edge surface of the second lead screw (403). U-shaped seats (405) are symmetrically formed on four side surfaces of the second slider (404). An inner support plate one (406) is rotatably mounted between the U-shaped seats (405). A hollow groove (407) is formed inside the inner support plate one (406).

6. The grinding device for polyethylene pipe production according to claim 5, characterized in that, U-shaped plates (408) are symmetrically formed in a circular array on the inner wall of one end of the outer cylinder body (410) facing the rotating seat (401). An inner support plate two (409) is rotatably mounted between the U-shaped plates (408). The inner support plate two (409) passes out of the hollow groove (407), and the inner support plate two (409) is rotationally connected to the central position of the hollow groove (407) through a rotating shaft. The inner support plate two (409) and one end of the hollow groove (407) both pass out of the limiting groove (411) and are movably abutted against the inner surface of the polyethylene pipe (101).

7. A grinding device for polyethylene pipe production according to claim 6, characterized in that, The filling groove (102) is a groove structure formed by the intersection of a number of forward and reverse spiral grooves. The filling part (103) has a diamond structure. The first laser distance sensor and the second laser distance sensor are electrically connected to the parameter input module and the buzzer alarm. A semi-circular groove is formed at the bottom end of the grinding tool (312).

8. A method for a grinding device applied to the production of polyethylene pipes as described in claim 7, characterized in that, It includes the following steps: S1. Insert the inner support assembly (4) into the inner part of one end of the polyethylene pipe (101) whose surface needs to be cut. Insert an external insertion rod into the dial hole (402) and rotate it, so that the second lead screw (403) rotates and drives the second slider (404) to move. The movement of the second slider (404) drives the U-shaped seat (405) to move and pushes the inner support plate one (406) and the inner support plate two (409) to move relatively, so that the ends of the inner support plate one (406) and the inner support plate two (409) are abutted against the inner wall of the polyethylene pipe (101), realizing the support for the inner wall of the polyethylene pipe (101). S2. Input the axial length to be cut on the surface of the polyethylene pipe (101), the diameter of the polyethylene pipe (101), the number of spiral turns of the filling groove (102), into the parameter input module, and calculate the total volume of the groove structure formed by the intersection of several forward and reverse spiral grooves and the total volume of the filling part (103) through the parameter input module, and make the total volume of the filling groove (102) equal to the total volume of the filling part (103), and calculate the grinding depth of the grinding tool (312) when it descends for grinding, as well as the axial spacing of several forward and reverse spiral grooves of the first slider (309), ; S3. After the calculation is completed, hold the handle (302) and rotate it to move the grinding tool (312) to the initial position required for cutting on the surface of the polyethylene pipe (101). Then, rotate the second knob (310) to make the second threaded rod (311) rotate and drive the grinding tool (312) to move downward. Measure the distance between the second knob (310) and the first slider (309) through the first laser distance sensor. When the grinding tool (312) reaches the proper position, that is, the grinding depth is in place, trigger the buzzer alarm to sound, and stop rotating the second knob (310). Then, hold the handle (302) and rotate it to cut a first helical groove on the surface of the polyethylene pipe (101) through the grinding tool (312). Reverse-rotate the second knob (310) to disengage the grinding tool (312) from the first helical groove. Hold the handle (302) and rotate it in the reverse direction to reset the grinding tool (312). Then, rotate the second knob (310) to make the second threaded rod (311) rotate and drive the grinding tool (312) to move downward to the proper position; S4. Then, by rotating the first knob (308), the first lead screw (306) rotates to drive the first slider (309) to move. The distance between the laser distance sensor two and the first slider (309) is measured. When the first slider (309) moves in place, the buzzer alarm is triggered. Then, hold the handle (302) and rotate it. The grinding tool (312) cuts on the surface of the polyethylene pipe (101) to form a second helical groove with a distance from the first helical groove of . Reverse the rotation of the second knob (310) to disengage the grinding tool (312) from the second helical groove. Hold the handle (302) and rotate it in the reverse direction to reset the grinding tool (312). Then, turn the second knob (310) to rotate the second threaded rod (311) and drive the grinding tool (312) to move down in place; S5. Next, rotate the first knob (308) so that the first lead screw (306) rotates and drives the first slider (309) to move. Measure the distance between it and the first slider (309) with the second laser distance sensor. When the first slider (309) moves in place, trigger the buzzer alarm. Then hold the handle (302) and rotate it. Cut a third helical groove with a spacing of from the second helical groove on the surface of the polyethylene pipe (101) through the grinding tool (312); S6. Then hold the handle (302) and rotate it in the reverse direction, repeat the steps in S3 above to form a first reverse helical groove, a second reverse helical groove and a third reverse helical groove with an axial pitch of to thereby form a filling groove (102) and a filling portion (103) on the surface of the polyethylene pipe (101).

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