Preparation Method and Detection Equipment for the Sand and Gravel Resistance Strength of MPVE Bellows

Abstract

The present invention discloses a preparation method and a detection device for the anti-sand and gravel strength of MPVE corrugated pipes, including the following operating steps: Step S1, prepare raw materials; Step S2, mix and stir; Step S3, vacuum feeding; Step S4, material extrusion; Step S5, material forming; Step S6, cut the material; Step S7, strength detection; Step S8, finished product packaging. The beneficial effect of the present invention is that the anti-sand and gravel strength detection device for MPVE corrugated pipes is reasonably designed, novel in structure, simple in use method and convenient to operate. The sand and gravel are poured by the material transportation structure, and the anti-sand and gravel strength of the corrugated pipe is initially detected by the free fall of the sand and gravel. After the sand and gravel are poured, the pressing plate is pushed up and down by the first hydraulic rod to press the sand and gravel, so as to further detect the anti-sand and gravel strength of the corrugated pipe, improving the accuracy of the anti-sand and gravel strength detection. According to the pressure of the first hydraulic rod, the compressive strength of the corrugated pipe is recorded.

Description

Technical Field

[0001] The present invention relates to the technical field of detecting the anti-sand and gravel strength of MPVE corrugated pipes, in particular to a preparation method and a detection device for the anti-sand and gravel strength of MPVE corrugated pipes. Background Art

[0002] A corrugated pipe refers to a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and telescoping direction. Corrugated pipes are widely used in instruments and meters. Their main use is as a measuring element of a pressure measuring instrument, which converts pressure into displacement or force. The wall of the corrugated pipe is relatively thin, with high sensitivity, and the measurement range is from dozens of pascals to dozens of megapascals. Its open end is fixed, and the sealed end is in a free state, and an auxiliary spiral spring or reed is used to increase elasticity. When working, under the action of internal pressure, it elongates along the length direction of the pipe, causing the movable end to generate a displacement related to the pressure. The movable end drives the pointer to directly indicate the magnitude of the pressure. Corrugated pipes are often combined with displacement sensors to form a pressure sensor with an electrical output. Sometimes they are also used as isolation elements. Since the expansion of the corrugated pipe requires a large volume change, its response speed is lower than that of the Bourdon tube. Corrugated pipes are suitable for measuring low pressures.

[0003] Existing ordinary PVE double-wall corrugated pipes have poor low-temperature performance, a high breakage rate during storage, transportation and construction, a small pipe diameter, and it is difficult to form pipes with a diameter above 450 mm. At the same time, they contain lead salt stabilizers, which are likely to pollute water resources and soil in the long term. Compared with pipes of the same diameter, PE winding pipes are heavier per unit meter, and the production speed is low, making it difficult to meet the needs of large-scale projects. Moreover, the end face sealing is difficult and easy to break. For the detection of the anti-sand and gravel strength of existing corrugated pipes, usually an excavator is used to lift the sand and gravel to a certain height and then pour it, and the anti-sand and gravel strength of the corrugated pipe is detected by the free-fall impact of the sand and gravel on the corrugated pipe. This detection method not only consumes manpower and material resources, but also makes the detected values inaccurate and unconvincing. In view of this, in-depth research on the above problems has led to the generation of this case. Summary of the Invention

[0004] The object of the present invention is to solve the above problems, and a preparation method and a detection device for the sand and gravel resistance strength of MPVE corrugated pipes are designed, which solve the problems that the existing ordinary PVE double-wall corrugated pipes have poor low-temperature performance, high breakage rates during storage, transportation and construction, small pipe diameters, difficult forming for pipe diameters above 450 mm, and contain lead salt stabilizers, which are prone to pollute water resources and soil in the long term. Compared with pipes of the same diameter, PE winding pipes have a heavier unit weight per meter, low production speed, and it is difficult to meet the requirements of large-scale projects. Moreover, the end face sealing is difficult and prone to breakage. In addition, for the detection of the sand and gravel resistance strength of existing corrugated pipes, usually an excavator is used to lift the sand and gravel to a certain height and then pour it, and the sand and gravel freely fall to impact the corrugated pipe to detect the sand and gravel resistance strength of the corrugated pipe. This detection method not only consumes manpower and material resources, but also makes the detected values inaccurate and unconvincing.

[0005] The technical solution of the present invention to achieve the above object is: a preparation method and a detection device for the sand and gravel resistance strength of MPVE corrugated pipes, including the following operation steps: Step S1, prepare raw materials; Step S2, mix and stir; Step S3, vacuum feeding; Step S4, material extrusion; Step S5, material forming; Step S6, cut the material; Step S7, strength detection; Step S8, finished product packaging.

[0006] Step S1: Prepare raw materials for the outer wall pipe: 53-62 parts of polyethylene resin, 5-7 parts of recycled material, 25-38 parts of fixed filler, 4-5 parts of stearic acid, 3-6 parts of desiccant, 3-5 parts of dark green masterbatch, 5-8 parts of talcum powder. Prepare raw materials for the inner wall pipe: 50-65 parts of polyethylene resin, 5-7 parts of recycled material, 25-38 parts of fixed filler, 4-5 parts of stearic acid, 3-6 parts of desiccant, 3-5 parts of dark green masterbatch, 5-8 parts of talcum powder;

[0007] Step S2: Mix the raw materials for the outer wall pipe and the raw materials for the inner wall pipe respectively. Put the raw materials prepared in Step S1 into a double mixer for mixing, which is divided into two types, inner and outer;

[0008] Step S3: Through vacuum feeding, forcibly feed the feeding machine regularly and quantitatively. The rotation speed of the feeding machine is set at 25-27 revolutions per minute. Two feeding machines feed continuously, and the set weight is 250 kg / h;

[0009] Step S4: Put the mixed material into a double-cone double-screw extruder. The rotation speed control range is: 28-32 revolutions per minute for the outer wall pipe and 17-21 revolutions per minute for the inner wall pipe. Melt and mix the material at 200-210 °C and a melt pressure of 19 MPa and extrude it through an extrusion die. The extrusion die is divided into an inner die and an outer die. Adjusting screws are provided on the inner and outer dies to adjust the wall thickness according to requirements;

[0010] Step S5: Segmentally control the shaping and traction of the pre-formed pipe blank on the forming machine, while performing the flaring forming process. The starting length of the flaring is 90 - 120 mm, and the ending length of the flaring is 350 - 370 mm. There are at least eight forming processes on the forming machine, and the forming speed is set between 400 - 6200 mm, with a speed range of 90 - 100 m / s. Cool and shape the formed pipe through a cooling machine;

[0011] Step S6: Cut the formed corrugated pipe through a cutting machine, and stack it after cutting;

[0012] Step S7: Randomly select a certain number of corrugated pipes from the produced corrugated pipes, and detect their anti-sand and gravel strength through detection equipment;

[0013] Step S8: After the corrugated pipe passes the inspection, package the finished product.

[0014] In the preparation of the outer wall pipe raw materials in Step S1: 55 - 58 parts of polyethylene resin, 6 parts of recycled material, 30 parts of fixed filler, 5 parts of stearic acid, 4 parts of desiccant, 4 parts of dark green masterbatch, 7 parts of talcum powder. In the preparation of the inner wall pipe raw materials: 60 - 65 parts of polyethylene resin, 7 parts of recycled material, 32 parts of fixed filler, 4 parts of stearic acid, 4 parts of desiccant, 3 parts of dark green masterbatch, 7 parts of talcum powder.

[0015] In Step S4, put the mixed materials into a twin-cone twin-screw extruder, and the rotation speed control range: for the outer wall pipe is 30 revolutions / min, and for the inner wall pipe is 19 revolutions / min. Melt and mix the materials at 200 - 210 °C and a melt pressure of 19 MPa and extrude through an extrusion die. The extrusion die is divided into an inner die and an outer die, and there are adjusting screws on the inner and outer dies to adjust the wall thickness according to requirements.

[0016] In Step S5, segmentally control the shaping and traction of the pre-formed pipe blank on the forming machine, while performing the flaring forming process. The starting length of the flaring is 105 mm, and the ending length of the flaring is 360 mm. There are at least eight forming processes on the forming machine, and the forming speed is set between 500 - 6000 mm, with a speed range of 100 m / s. Cool and shape the formed pipe through a cooling machine.

[0017] In Step S7, randomly select 8 - 10 corrugated pipes from the produced corrugated pipes for inspection, and the length of the corrugated pipes is 1 m. Detect their anti-sand and gravel strength through the detection equipment for the anti-sand and gravel strength of MPVE corrugated pipes.

[0018] An MPVE corrugated pipe anti-sand and gravel strength detection device, comprising: a box body, a sleeve, a movable door, a first hydraulic rod, a second hydraulic rod, a pushing plate, a pressing plate, a pair of identical lead screw modules, a cover plate, a frame electromagnet, and a material conveying structure. One end of the sleeve is fixedly installed on the rear wall surface of the box body. The movable door is installed on the box body, and one end of the movable door is movably connected to the side wall surface of the box body. The pair of lead screw modules are fixedly installed on the box body and are respectively located on both sides of the box body. The cover plate is located above the box body. The two ends of the cover plate are fixedly connected to the pair of lead screw modules. The first hydraulic rod is fixedly installed at the top end of the cover plate. The pressing plate is fixedly connected to the telescopic end of the first hydraulic rod. The bottom end of the second hydraulic rod is fixedly installed on the inner wall surface of the sleeve. The pushing plate is fixedly installed on the telescopic end of the second hydraulic rod. The material conveying structure is fixedly installed on the side wall surface of the box body.

[0019] The material conveying structure includes: a material conveying frame, a material conveying hopper, a rack, a servo motor, a driving gear, and a clamping part;

[0020] The material conveying frame is fixedly installed on the outer wall surface of the box body. The rack is fixedly installed on the material conveying frame. The servo motor is fixedly installed at the bottom end of the material conveying hopper. The driving gear is sleeved on the driving end of the servo motor and meshes with the rack. The clamping part is fixedly installed on the side wall surface of the material conveying hopper, and the other end of the clamping part is in contact with the inner wall surface of the material conveying frame.

[0021] The clamping part includes: a pair of identical clamping plates, a support frame, a pair of identical chutes, and a pair of identical sliders;

[0022] One end of the pair of clamping plates is fixedly connected to the side wall surface of the material conveying hopper, and the other end of the pair of clamping plates is in contact with the inner wall surface of the material conveying frame. The support frame is fixedly installed between the pair of clamping plates. The pair of chutes are embedded inside the material conveying frame. One end of the pair of sliders is fixedly installed on the other end of the clamping plates, and the other end of the pair of sliders is embedded inside the pair of chutes.

[0023] A pair of identical support parts are provided on the side wall surface of the box body. The support part includes: a base, a third hydraulic rod, a connecting block, and a support plate;

[0024] The base is fixedly installed at the bottom end of the material conveying hopper. The bottom end of the third hydraulic rod is fixedly installed on the base. The connecting block is fixedly installed on the third hydraulic rod. The support plate is fixedly installed on the telescopic end of the third hydraulic rod.

[0025] The box body is provided with a discharging part, and the discharging part includes: a discharging port, a fourth hydraulic rod and a discharging plate. The discharging port is fixedly installed at the bottom end of the box body, the fourth hydraulic rod is fixedly installed on the side wall surface of the box body, the discharging plate is located inside the box body and is fixedly connected to the telescopic end of the fourth hydraulic rod. The discharging port is rectangular, a control valve is arranged on the discharging port, and a movable plate is arranged on the discharging port. One end of the movable plate is movably installed at the front end of the discharging port.

[0026] The preparation method and detection equipment for the anti-sand and gravel strength of MPVE corrugated pipes made by using the technical scheme of the present invention are reasonably designed, novel in structure, simple in use method and convenient to operate. The sand and gravel are dumped through the material transportation structure, and the anti-sand and gravel strength of the corrugated pipe is initially detected by the free fall of the sand and gravel. After the sand and gravel dumping is completed, the pressing plate is pushed up and down by the first hydraulic rod to press the sand and gravel, so as to further detect the anti-sand and gravel strength of the corrugated pipe, improve the accuracy of the anti-sand and gravel strength detection, record the compressive strength of the corrugated pipe according to the pressure of the first hydraulic rod, and solve the problems that the existing ordinary PVE double-wall corrugated pipes have poor low-temperature performance, high breakage rate during storage, transportation and construction, small pipe diameter, difficult to form when the diameter is above 450mm, and contain lead salt stabilizers, which are easy to pollute water resources and soil in the long term. Compared with the corrugated pipes of the same diameter, the PE winding pipes have a heavier unit weight per meter, low production speed, difficult to meet the needs of large-scale projects, difficult end face sealing, easy to break, and the existing detection of the anti-sand and gravel strength of corrugated pipes usually uses an excavator to lift the sand and gravel to a certain height and then dump it, and the anti-sand and gravel strength of the corrugated pipe is detected by the free fall impact of the sand and gravel. This detection method not only consumes manpower and material resources, but also makes the detected values inaccurate and unconvincing. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the preparation method and detection equipment for the anti-sand and gravel strength of the MPVE corrugated pipe described in the present invention.

[0028] Figure 2 It is a front view structural schematic diagram of the preparation method and detection equipment for the anti-sand and gravel strength of the MPVE corrugated pipe described in the present invention.

[0029] Figure 3 It is a left view structural schematic diagram of the preparation method and detection equipment for the anti-sand and gravel strength of the MPVE corrugated pipe described in the present invention.

[0030] Figure 4 It is a right view structural schematic diagram of the preparation method and detection equipment for the anti-sand and gravel strength of the MPVE corrugated pipe described in the present invention.

[0031] Figure 5 It is a rear view structural schematic diagram of the preparation method and detection equipment for the anti-sand and gravel strength of the MPVE corrugated pipe described in the present invention.

[0032] Figure 6 It is a top view structural schematic diagram of the preparation method and detection equipment for the sand and gravel resistance strength of the MPVE corrugated pipe described in the present invention.

[0033] Figure 7 It is a top view sectional structural schematic diagram of the preparation method and detection equipment for the sand and gravel resistance strength of the MPVE corrugated pipe described in the present invention.

[0034] Figure 8 For the present invention Figure 1 A partial enlarged structural schematic diagram of the preparation method and detection equipment for the sand and gravel resistance strength of the MPVE corrugated pipe described.

[0035] Figure 9 For the present invention Figure 4 A partial enlarged structural schematic diagram of the preparation method and detection equipment for the sand and gravel resistance strength of the MPVE corrugated pipe described.

[0036] Figure 10 For the present invention Figure 7 A partial enlarged structural schematic diagram of the preparation method and detection equipment for the sand and gravel resistance strength of the MPVE corrugated pipe described.

[0037] In the figure: 1, box body; 2, sleeve; 3, movable door; 4, first hydraulic rod; 5, second hydraulic rod; 6, pushing plate; 7, pressing plate; 8, lead screw module; 9, cover plate; 10, frame electromagnet; 11, material transporting frame; 12, material transporting hopper; 13, rack; 14, servo motor; 15, driving gear; 16, clamping plate; 17, support frame; 18, sliding groove; 19, slider; 20, base; 21, third hydraulic rod; 22, connecting block; 23, support plate; 24, discharge port; 25, control valve; 26, movable plate; 27, fourth hydraulic rod; 28, discharge plate. Specific embodiments

[0038] The present invention will be specifically described below in conjunction with the accompanying drawings, as Figures 1-10As shown, the preparation method and testing equipment for the sand and gravel resistance of MPVE corrugated pipes include the following operating steps: Step S1, prepare raw materials; Step S2, mix and stir; Step S3, vacuum feeding; Step S4, material extrusion; Step S5, material forming; Step S6, cut the material; Step S7, strength testing; Step S8, finished product packaging. Step S1: Prepare the raw materials for the outer wall pipe: 53 - 62 parts of polyethylene resin, 5 - 7 parts of recycled material, 25 - 38 parts of fixed filler, 4 - 5 parts of stearic acid, 3 - 6 parts of desiccant, 3 - 5 parts of dark green masterbatch, 5 - 8 parts of talcum powder. Prepare the raw materials for the inner wall pipe: 50 - 65 parts of polyethylene resin, 5 - 7 parts of recycled material, 25 - 38 parts of fixed filler, 4 - 5 parts of stearic acid, 3 - 6 parts of desiccant, 3 - 5 parts of dark green masterbatch, 5 - 8 parts of talcum powder; Step S2: Mix the raw materials for the outer wall pipe and the inner wall pipe respectively. Put the raw materials prepared in Step S1 into a double mixer for mixing, which has two types inside and outside; Step S3: Through vacuum feeding, forcibly feed the feeder at regular intervals and in fixed quantities. The rotation speed of the feeder is set at 25 - 27 revolutions per minute. Two feeders feed continuously, and the set weight is 250 kg / h; Step S4: Put the mixed material into a double - cone double - screw extruder. The rotation speed control range is: 28 - 32 revolutions per minute for the outer wall pipe and 17 - 21 revolutions per minute for the inner wall pipe. Melt and mix the material at 200 - 210 °C and 19 MPa melt pressure and extrude it through an extrusion die. The extrusion die is divided into an inner die and an outer die. Adjusting screws are provided on the inner and outer dies to adjust the wall thickness according to requirements; Step S5: Segmentally control the shaping and traction of the basic formed pipe blank on a forming machine, and at the same time carry out the flaring forming process. The starting length of the flare is 90 - 120 mm, and the ending length of the flare is 350 - 370 mm. There are at least eight forming processes on the forming machine. The forming speed is set between 400 - 6200 mm, and the speed range is 90 - 100 m / s. Cool and shape the formed pipe through a cooler; Step S6: Cut the formed corrugated pipe through a cutting machine, and stack it after cutting; Step S7: Randomly select a certain number of corrugated pipes from the produced corrugated pipes, and test their sand and gravel resistance through testing equipment;Step S8: After the corrugated pipe is detected to be qualified, the finished product is packaged. In step S1, the raw materials for the outer wall pipe are prepared as follows: 55-58 parts of polyethylene resin, 6 parts of recycled material, 30 parts of fixed filler, 5 parts of stearic acid, 4 parts of desiccant, 4 parts of dark green masterbatch, and 7 parts of talcum powder. The raw materials for the inner wall pipe are prepared as follows: 60-65 parts of polyethylene resin, 7 parts of recycled material, 32 parts of fixed filler, 4 parts of stearic acid, 4 parts of desiccant, 3 parts of dark green masterbatch, and 7 parts of talcum powder. In step S4, the mixed materials are put into a twin-screw extruder with a conical barrel. The rotation speed control range is: 30 rpm for the outer wall pipe and 19 rpm for the inner wall pipe. The materials are melted and mixed at 200-210°C and a melt pressure of 19 MPa and then extruded through an extrusion die. The extrusion die is divided into an inner die and an outer die. Adjusting screws are provided on the inner and outer dies to adjust the wall thickness according to requirements. In step S5, the pre-formed pipe blank is sectionally controlled for shaping, traction, and at the same time, a flaring forming process is carried out. The starting length of the flare is 105 mm, and the ending length of the flare is 360 mm. There are at least eight shaping processes on the forming machine, and the shaping speed is set between 500-6000 mm, with a speed range of 100 m / s. The formed pipe is cooled and shaped by a cooling machine. In step S7, 8-10 corrugated pipes are randomly selected from the produced corrugated pipes for testing, and the length of the corrugated pipe is 1 m. The anti-sandstone strength of the MPVE corrugated pipe is detected by an anti-sandstone strength detection device for MPVE corrugated pipes, which includes: a box body 1, a sleeve 2, a movable door 3, a first hydraulic rod 4, a second hydraulic rod 5, a push plate 6, a pressing plate 7, a pair of identical lead screw modules 8, a cover plate 9, a frame electromagnet 10, and a material conveying structure. One end of the sleeve 2 is fixedly installed on the rear wall surface of the box body 1. The movable door 3 is installed on the box body 1, and one end of the movable door 3 is movably connected to the side wall surface of the box body 1. The pair of lead screw modules 8 are fixedly installed on the box body 1 and are located on both sides of the box body 1 respectively. The cover plate 9 is located above the box body 1. The two ends of the cover plate 9 are fixedly connected to the pair of lead screw modules 8. The first hydraulic rod 4 is fixedly installed at the top end of the cover plate 9. The pressing plate 7 is fixedly connected to the telescopic end of the first hydraulic rod 4. The bottom end of the second hydraulic rod 5 is fixedly installed on the inner wall surface of the sleeve 2. The push plate 6 is fixedly installed on the telescopic end of the second hydraulic rod 5. The material conveying structure is fixedly installed on the side wall surface of the box body 1. The material conveying structure includes: a material conveying frame 11, a material conveying hopper 12, a rack 13, a servo motor 14, a driving gear 15, and a clamping part;The material transporting frame 11 is fixedly installed on the outer wall surface of the box body 1. The rack 13 is fixedly installed on the material transporting frame 11. The servo motor 14 is fixedly installed at the bottom end of the material hopper 12. The driving gear 15 is sleeved on the driving end of the servo motor 14 and meshes with the rack 13. The clamping part is fixedly installed on the side wall surface of the material hopper 12, and the other end of the clamping part is in contact with the inner wall surface of the material transporting frame 11. The clamping part includes: a pair of identically structured clamping plates 16, a support frame 17, a pair of identically structured sliding grooves 18, and a pair of identically structured sliding blocks 19. One end of the pair of clamping plates 16 is fixedly connected to the side wall surface of the material hopper 12, and the other end of the pair of clamping plates 16 is in contact with the inner wall surface of the material transporting frame 11. The support frame 17 is fixedly installed between the pair of clamping plates 16. The pair of sliding grooves 18 are embedded inside the material transporting frame 11. One end of the pair of sliding blocks 19 is fixedly installed on the other end of the clamping plate 16, and the other end of the pair of sliding blocks 19 is embedded inside the pair of sliding grooves 18. A pair of identically structured support parts are provided on the side wall surface of the box body 1. The support part includes: a base 20, a third hydraulic rod 21, a connecting block 22, and a support plate 23. The base 20 is fixedly installed at the bottom end of the material hopper 12. The bottom end of the third hydraulic rod 21 is fixedly installed on the base 20. The connecting block 22 is fixedly installed on the third hydraulic rod 21. The support plate 23 is fixedly installed on the telescopic end of the third hydraulic rod 21. An unloading part is provided on the box body 1. The unloading part includes: an unloading port 24, a fourth hydraulic rod 27, and an unloading plate 28. The unloading port 24 is fixedly installed at the bottom end of the box body 1. The fourth hydraulic rod 27 is fixedly installed on the side wall surface of the box body 1. The unloading plate 28 is located inside the box body 1 and is fixedly connected to the telescopic end of the fourth hydraulic rod 27. The unloading port 24 is rectangular. A control valve 25 is provided on the unloading port 24. An activity plate 26 is provided on the unloading port 24, and one end of the activity plate 26 is movably installed at the front end of the unloading port 24.;

[0039] The characteristics of this implementation scheme are the preparation method and detection equipment for the anti-sand and gravel strength of MPVE corrugated pipes, including the following operating steps: Step S1, prepare raw materials; Step S2, mix and stir; Step S3, vacuum feeding; Step S4, material extrusion; Step S5, material forming; Step S6, cut the material; Step S7, strength detection; Step S8, finished product packaging.

[0040] Step S1: Prepare the raw materials for the outer wall pipe: 53 - 62 parts of polyethylene resin, 5 - 7 parts of recycled material, 25 - 38 parts of fixed filler, 4 - 5 parts of stearic acid, 3 - 6 parts of desiccant, 3 - 5 parts of dark green masterbatch, 5 - 8 parts of talcum powder. Prepare the raw materials for the inner wall pipe: 50 - 65 parts of polyethylene resin, 5 - 7 parts of recycled material, 25 - 38 parts of fixed filler, 4 - 5 parts of stearic acid, 3 - 6 parts of desiccant, 3 - 5 parts of dark green masterbatch, 5 - 8 parts of talcum powder;

[0041] Step S2: Mix the raw materials of the outer wall pipe and the inner wall pipe respectively. Put the raw materials prepared in Step S1 into a double mixer for mixing, which is divided into two types: inner and outer;

[0042] Step S3: Through vacuum feeding, forcibly feed the feeder at regular intervals and in fixed quantities. The rotational speed of the feeder is set at 25 - 27 revolutions per minute. Two feeders feed continuously, and the set weight is 250 kg / h;

[0043] Step S4: Put the mixed material into a double - cone double - screw extruder. The rotational speed control range is as follows: for the outer wall pipe, it is 28 - 32 revolutions per minute, and for the inner wall pipe, it is 17 - 21 revolutions per minute. Melt and mix the material at 200 - 210 °C and a melt pressure of 19 MPa and extrude it through an extrusion die. The extrusion die is divided into an inner die and an outer die. Adjusting screws are provided on the inner and outer dies to adjust the wall thickness according to requirements;

[0044] Step S5: Segmentally control the shaping and traction of the formed pipe blank on a shaping machine, and at the same time carry out the flaring forming process. The starting length of the flare is 90 - 120 mm, and the ending length of the flare is 350 - 370 mm. There are at least eight shaping processes on the shaping machine. The shaping speed is set between 400 - 6200 mm, and the speed range is 90 - 100 m / s. Cool and shape the formed pipeline through a cooler;

[0045] Step S6: Cut the formed corrugated pipe through a cutting machine, and stack it after cutting;

[0046] Step S7: Randomly select a certain number of corrugated pipes from the produced corrugated pipes, and detect their anti - sand and gravel strength through a detection device;

[0047] Step S8: After the corrugated pipe passes the inspection, package the finished product;

[0048] The MPVE corrugated pipe anti-sand and gravel strength detection equipment is reasonably designed, novel in structure, simple in use method and easy to operate. It dumps sand and gravel through the material transportation structure, and initially detects the anti-sand and gravel strength of the corrugated pipe through the free fall of sand and gravel. After the sand and gravel dumping is completed, the first hydraulic rod is used to push the pressing plate to lift and press the sand and gravel, so as to further detect the anti-sand and gravel strength of the corrugated pipe, improving the accuracy of the anti-sand and gravel strength detection. According to the pressure of the first hydraulic rod, the compressive strength of the corrugated pipe is recorded, solving the problems that the existing ordinary PVE double-wall corrugated pipes have poor low-temperature performance, high breakage rates during storage, transportation and construction, small pipe diameters, difficult to form when the diameter is above 450mm, and contain lead salt stabilizers, which are easy to pollute water resources and soil in the long term. And compared with pipes of the same diameter, the PE winding pipes are heavier per unit meter in weight, and the production speed is low, making it difficult to meet the needs of large-scale projects. Moreover, the end face sealing is difficult and easy to break. And for the existing detection of the anti-sand and gravel strength of corrugated pipes, usually an excavator is used to lift the sand and gravel to a certain height and then dump it. The free fall of the sand and gravel impacts the corrugated pipe to detect the anti-sand and gravel strength of the corrugated pipe. This detection method not only consumes manpower and material resources, but also makes the detected values inaccurate and unconvincing.

[0049] Persons in this field should connect all the electrical components in this case to their adapted power supplies through wires, and should select a suitable controller according to the actual situation to meet the control requirements. For the specific connection and control sequence, the electrical connection should be completed according to the sequence of the work of each electrical component in the following working principle. The detailed connection means are well-known techniques in this field. The following mainly introduces the working principle and process, and will not explain the electrical control.

[0050] Example: In the specific implementation process, the MPVE corrugated pipe with high anti-gravel strength is produced according to the following steps. First, prepare the following raw materials: Prepare the raw materials for the outer wall pipe: 55-58 parts of polyethylene resin, 6 parts of recycled material, 30 parts of fixed filler, 5 parts of stearic acid, 4 parts of desiccant, 4 parts of dark green masterbatch, 7 parts of talc powder. Prepare the raw materials for the inner wall pipe: 60-65 parts of polyethylene resin, 7 parts of recycled material, 32 parts of fixed filler, 4 parts of stearic acid, 4 parts of desiccant, 3 parts of dark green masterbatch, 7 parts of talc powder. After the raw materials are prepared, mix the raw materials for the outer wall pipe and the raw materials for the inner wall pipe respectively. Put the prepared raw materials into a double mixer for mixing. There are two types, internal and external. Through vacuum feeding, forcibly feed the feeding machine regularly and quantitatively. The rotation speed of the feeding machine is set at 25-27 revolutions / min. The two feeding machines feed continuously, and the set weight is 250 kg / h. Then put the mixed material into a double-cone twin-screw extruder. The rotation speed control range: 30 revolutions / min for the outer wall pipe and 19 revolutions / min for the inner wall pipe. Melt and mix at 200-210 °C and 19 MPa melt pressure and extrude through an extrusion die. The extrusion die is divided into an inner die and an outer die. Adjusting screws are provided on the inner and outer dies to adjust the wall thickness according to requirements. Segmentally control the shaping and traction of the basic formed pipe blank on the shaping machine, and at the same time carry out the flaring forming process. The starting length of the flaring is 105 mm, and the ending length of the flaring is 360 mm. There are at least eight shaping processes on the shaping machine. The shaping speed is set between 500-6000 mm, and the speed range is 100 m / s. Cool and shape the formed pipe through a cooler. Cut the formed corrugated pipe through a cutting machine, and stack it after cutting. Randomly select 8-10 corrugated pipes from the produced corrugated pipes for testing, and the length of the corrugated pipe is 1 m. Detect the anti-gravel strength of the corrugated pipe through the detection equipment for the anti-gravel strength of the MPVE corrugated pipe. After the corrugated pipe passes the test, package the finished product.

[0051] According to the attached drawings of the specification Figures 1-10 It can be seen that a detection device for the anti-gravel strength of an MPVE corrugated pipe manufactured according to the above method mainly includes: a box body 1, a sleeve 2, a movable door 3, a first hydraulic rod 4, a second hydraulic rod 5, a push plate 6, a pressing plate 7, a pair of identical lead screw modules 8, a cover plate 9, a frame electromagnet 10 and a material conveying structure. The connection relationship and position relationship are as follows;

[0052] One end of the sleeve 2 is fixedly installed on the rear wall surface of the box body 1. The movable door 3 is installed on the box body 1, and one end of the movable door 3 is movably connected to the side wall surface of the box body 1. A pair of screw rod modules 8 are fixedly installed on the box body 1 and are respectively located on both sides of the box body 1. The cover plate 9 is located above the box body 1, and both ends of the cover plate 9 are fixedly connected to the pair of screw rod modules 8. The first hydraulic rod 4 is fixedly installed at the top end of the cover plate 9. The pressing plate 7 is fixedly connected to the telescopic end of the first hydraulic rod 4. The bottom end of the second hydraulic rod 5 is fixedly installed on the inner wall surface of the sleeve 2. The pushing plate 6 is fixedly installed on the telescopic end of the second hydraulic rod 5. The material conveying structure is fixedly installed on the side wall surface of the box body 1.

[0053] In summary, generally speaking, when in use, open the movable door 3, place the selected corrugated pipe inside the box body 1, and place one end of the corrugated pipe inside the sleeve 2. Fix the corrugated pipe through the sleeve 2 to prevent the sleeve 2 from shifting during the detection process. Close the movable door 3, start the material conveying structure, and pour the prepared sand and gravel into the box body 1 through the material conveying structure. Conduct a preliminary strength test on the corrugated pipe through the free fall of the sand and gravel. After the sand and gravel are poured, the material conveying structure resets. Start the screw rod module 8, and drive the cover plate 9 to move up and down through the screw rod module 8. When the cover plate 9 is buckled on the top of the box body 1, start the frame electromagnet 10 to closely fit the cover plate 9 with the top of the box body 1. After fixing the cover plate 9, start the first hydraulic rod 4, drive the pressing plate 7 to lift and lower through the first hydraulic rod 4, press the sand and gravel through the pressing plate 7, and adjust the pressure of the pressing plate 7 on the sand and gravel by adjusting the telescopic length of the hydraulic rod, so as to measure the sand and gravel compressive strength of the corrugated pipe. After the detection is completed, reset the components such as the cover plate 9 and the pressing plate 7, discharge the sand and gravel to the outside of the box body 1 through the material conveying structure, open the movable door 3, start the second hydraulic rod 5, push the pushing plate 6 through the second hydraulic rod 5, and push the corrugated pipe out of the box body 1. Observe the deformation degree of the corrugated pipe. This device improves the accuracy of the sand and gravel resistance strength detection, and solves the problems that the existing ordinary PVE double-wall corrugated pipes have poor low-temperature performance, high breakage rates during storage, transportation and construction, small pipe diameters, difficult to form when the diameter is above 450mm, contain lead salt stabilizers, are easy to pollute water resources and soil in the long term, and the PE winding pipes are heavier per unit meter compared with pipes of the same diameter, and the production speed is low, it is difficult to meet the needs of large-scale projects, and the end face sealing is difficult, easy to break, and for the existing sand and gravel resistance strength detection of corrugated pipes, usually an excavator is used to lift the sand and gravel to a certain height and then pour it, and the free fall of the sand and gravel impacts the corrugated pipe to detect the sand and gravel resistance strength of the corrugated pipe. This detection method not only consumes manpower and material resources, but also makes the detected values inaccurate and unconvincing.

[0054] As a preferred solution, further, the material conveying structure includes: a material conveying frame 11, a material hopper 12, a rack 13, a servo motor 14, a driving gear 15, and a clamping portion. The material conveying frame 11 is fixedly installed on the outer wall surface of the box body 1. The rack 13 is fixedly installed on the material conveying frame 11. The servo motor 14 is fixedly installed at the bottom end of the material hopper 12. The driving gear 15 is sleeved on the driving end of the servo motor 14 and meshes with the rack 13. The clamping portion is fixedly installed on the side wall surface of the material hopper 12, and the other end of the clamping portion is in contact with the inner wall surface of the material conveying frame 11. The material hopper 12 is used to store and convey sand and gravel. Start the servo motor 14. Through the rotation of the servo motor 14, drive the driving gear 15 to rotate. Through the rotation of the driving gear 15 and the cooperation with the rack 13, drive the material hopper 12 to lift and lower. The material conveying frame 11 supports the material hopper 12, and the clamping portion strengthens the connection strength between the material hopper 12 and the material conveying frame 11.

[0055] As a preferred solution, further, a pair of support portions with the same structure are provided on the side wall surface of the box body 1. The support portion includes: a base 20, a third hydraulic rod 21, a connecting block 22, and a support plate 23. The base 20 is fixedly installed at the bottom end of the material hopper 12. The bottom end of the third hydraulic rod 21 is fixedly installed on the base 20. The connecting block 22 is fixedly installed on the third hydraulic rod 21. The support plate 23 is fixedly installed on the telescopic end of the third hydraulic rod 21. The third hydraulic rod 21 is supported and fixed through the cooperation of the base 20 and the connecting block 22. Start the third hydraulic rod 21. Through the telescopic movement of the third hydraulic rod 21, push the bottom end of the material hopper 12 to tilt the material hopper 12 and increase the falling speed of the sand and gravel in the material hopper 12.

[0056] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that those skilled in the art of the present technology may make to some parts thereof all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. An inspection device for the anti-sand and gravel strength of an MPVE corrugated pipe, comprising: Box body (1), sleeve (2), movable door (3), first hydraulic rod (4), second hydraulic rod (5), push plate (6), pressing plate (7), a pair of identical lead screw modules (8), cover plate (9), frame electromagnet (10) and a material conveying structure, characterized in that one end of the sleeve (2) is fixedly installed on the rear wall surface of the box body (1), the movable door (3) is installed on the box body (1), and one end of the movable door (3) is movably connected to the side wall surface of the box body (1), a pair of the lead screw modules (8) are fixedly installed on the box body (1) and are respectively located on both sides of the box body (1), the cover plate (9) is located above the box body (1), both ends of the cover plate (9) are fixedly connected to a pair of lead screw modules (8), the first hydraulic rod (4) is fixedly installed on the top end of the cover plate (9), the pressing plate (7) is fixedly connected to the telescopic end of the first hydraulic rod (4), the bottom end of the second hydraulic rod (5) is fixedly installed on the inner wall surface of the sleeve (2), the push plate (6) is fixedly installed on the telescopic end of the second hydraulic rod (5), and the material conveying structure is fixedly installed on the side wall surface of the box body (1); The material conveying structure includes: a material conveying frame (11), a material conveying hopper (12), a rack (13), a servo motor (14), a driving gear (15) and a clamping part; The material conveying frame (11) is fixedly installed on the outer wall surface of the box body (1), the rack (13) is fixedly installed on the material conveying frame (11), the servo motor (14) is fixedly installed at the bottom end of the material conveying hopper (12), the driving gear (15) is sleeved on the driving end of the servo motor (14) and meshes with the rack (13), the clamping part is fixedly installed on the side wall surface of the material conveying hopper (12), and the other end of the clamping part is in contact with the inner wall surface of the material conveying frame (11); A pair of identical supporting parts are provided on the side wall surface of the box body (1), and the supporting parts include: a base (20), a third hydraulic rod (21), a connecting block (22) and a supporting plate (23); The base (20) is fixedly installed at the bottom end of the material conveying hopper (12), the bottom end of the third hydraulic rod (21) is fixedly installed on the base (20), the connecting block (22) is fixedly installed on the third hydraulic rod (21), and the supporting plate (23) is fixedly installed on the telescopic end of the third hydraulic rod (21).

2. The testing device for the anti-sand and gravel strength of an MPVE corrugated pipe according to claim 1, characterized in that, The clamping part includes: a pair of identical clamping plates (16), a support frame (17), a pair of identical chutes (18) and a pair of identical sliders (19); One end of a pair of the clamping plates (16) is fixedly connected to the side wall surface of the material conveying hopper (12), the other end of a pair of the clamping plates (16) is in contact with the inner wall surface of the material conveying frame (11), the support frame (17) is fixedly installed between a pair of the clamping plates (16), a pair of the chutes (18) are embedded inside the material conveying frame (11), one end of a pair of the sliders (19) is fixedly installed on the other end of the clamping plate (16), and the other end of a pair of the sliders (19) is embedded inside a pair of the chutes (18).

3. The detection device for the anti-sand and gravel strength of an MPVE corrugated pipe according to claim 2, characterized in that, The box body (1) is provided with a discharging part, and the discharging part includes: a discharging port (24), a fourth hydraulic rod (27), and a discharging plate (28). The discharging port (24) is fixedly installed at the bottom end of the box body (1), the fourth hydraulic rod (27) is fixedly installed on the side wall surface of the box body (1), the discharging plate (28) is located inside the box body (1) and is fixedly connected to the telescopic end of the fourth hydraulic rod (27). The discharging port (24) is rectangular, a control valve (25) is provided on the discharging port (24), and a movable plate (26) is provided on the discharging port (24). One end of the movable plate (26) is movably installed at the front end of the discharging port (24).

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