Processing method of polyvinyl chloride mute drain pipe

Abstract

The application discloses a processing method of a polyvinyl chloride mute drainage pipe and belongs to the technical field of polyvinyl chloride pipe processing. The processing method of the polyvinyl chloride mute drainage pipe comprises the following steps: step one, hot melting, raw materials are put into an extruder to be hot-melt extruded; step two, shaping, liquid raw materials hot-melt extruded by the extruder are transmitted to a shaping machine to be shaped into a double-layer middle-hole pipe; step three, cutting, a cutting machine is used to cut the pipe after shaping and solidification; step four, waste gas treatment, waste gas generated by hot melting of the raw materials is discharged into a treatment tank to be neutralized; and step five, drying, a pushing mechanism group is used to push the pipe after cutting into a drying mechanism group, and heat generated by neutralizing the waste gas is transmitted to the drying mechanism group to dry the pipe. The application can form the double-layer pipe at one time, simplifies a production process, improves production efficiency, ensures consistency and quality stability of products, and improves product quality and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PVC pipe processing, in particular to a processing method of PVC silent drainage pipe. BACKGROUND

[0002] UPVC drainage pipe is widely used in the world because of its low cost, beauty, convenient installation and maintenance, and long service life. However, it has a fatal weakness, that is, when draining, the noise is very loud, which affects the quietness of the room and sometimes wakes people up from sweet dreams. In the face of noise, UPVC core layer foaming pipe, solid wall UPVC inner spiral noise reduction pipe, hollow wall UPVC inner spiral noise reduction pipe, cyclone noise reducer, hydrophilic inner wall cyclone noise reducer, and hard polyvinyl chloride cyclone noise reduction tee joint have been developed successively.

[0003] A single-wall polyvinyl chloride silent drainage pipe (1) is disclosed in patent CN200810069249.2 on January 26, 2011. The single-wall polyvinyl chloride silent drainage pipe (1) is made of the following raw materials: PVC resin 100 parts, chlorinated polyethylene 10-20 parts, barium sulfate 150-350 parts, and a small amount of other related processing aids. In the design, the inner wall of the single-wall polyvinyl chloride silent drainage pipe (1) can be provided with an inner spiral rib (1a). Another single-wall polyvinyl chloride silent drainage pipe (1) has an axial cavity (1b) in the pipe wall. The single-wall polyvinyl chloride silent drainage pipe (1) can also have an inner spiral rib (1a) and an axial cavity (1b) in the pipe wall. The invention can reduce noise to 30-40 dB, fully meeting the requirements of the national urban area environmental noise standard GB3096-93, and the pipe wall only needs one layer. This layer of pipe wall can also meet the new noise reduction requirements and the mechanical strength requirements. Moreover, the equipment is simplified, the investment is reduced, and the cost is greatly reduced.

[0004] Currently, in order to improve the noise reduction effect of the polyvinyl chloride silent drainage pipe, a double-layer pipe made of polyvinyl chloride material is used to reduce the propagation of noise by utilizing the cavity in the double-layer pipe, thereby improving the noise reduction effect of the polyvinyl chloride silent drainage pipe. However, in the production process of the double-layer pipe, two spiral extruders are needed to extrude the inner and outer layers of the pipe, and then the outer pipe is sleeved on the inner pipe. Then, glue or secondary heating is used to make the material melt and generate adhesion, thereby adhering the two pipes. The double-layer pipe produced in this way has poor stability, and the inner and outer layers of the pipe may be separated or cracked due to vibration during transportation or use, which affects the service life and noise reduction effect of the pipe. In order to improve the stability of the pipe, a processing method of polyvinyl chloride silent drainage pipe is designed. SUMMARY

[0005] The application discloses a processing method of a polyvinyl chloride mute drainage pipe.

[0006] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0007] A processing method of a polyvinyl chloride mute drainage pipe, comprising the following steps:

[0008] Step one, hot melting, the raw materials are put into an extruder for hot melting extrusion;

[0009] Step two, plastic forming, the liquid raw materials melted by the extruder are transmitted to a plastic forming machine to form a double-layer hole pipe;

[0010] Step three, cutting, the pipe after plastic forming and solidification is cut by a cutting machine;

[0011] Step four, waste gas treatment, the waste gas generated by the hot melting of the raw materials is discharged into a treatment tank for neutralization;

[0012] Step five, drying, the pipe after cutting is pushed into a drying mechanism group by a pushing mechanism group, and the heat generated by the neutralization of the waste gas is transmitted to the drying mechanism group to dry the pipe;

[0013] Step six, the dried pipe is taken out from the drying machine.

[0014] In order to facilitate the plastic forming of the pipe, preferably, the plastic forming machine in step two comprises a base, an outer wall plastic forming pipe fixedly connected to the base, a shunt box fixedly connected to the outer wall plastic forming pipe, a partition hole plastic forming pipe fixedly connected to the shunt box and extending into the outer wall plastic forming pipe, an inner hole plastic forming pipe fixedly connected to the shunt box and extending into the outer wall plastic forming pipe, the inner hole plastic forming pipe being coaxial with the outer wall plastic forming pipe, a pushing block slidingly connected to the outer wall plastic forming pipe and slidingly connected to the partition hole plastic forming pipe and the inner hole plastic forming pipe, a transmission shaft rotatingly connected to the inner hole plastic forming pipe, an installation block fixedly connected to the transmission shaft, a threaded block fixedly connected to the installation block, and a driving part arranged on the base, wherein an output end of the driving part is connected to the pushing block.

[0015] In order to facilitate the plastic forming of the pipe, further, the driving part comprises a first hydraulic cylinder fixedly connected to the base, an installation ring fixedly connected to an output end of the first hydraulic cylinder, a sliding groove formed in the outer wall plastic forming pipe, and a connecting end of the installation ring penetrating through the sliding groove and fixedly connected to the pushing block.

[0016] In order to facilitate the shaping of the pipeline, further, the mounting ring is fixedly connected with a rack, the shunt tank is fixedly connected with a mounting bracket, the mounting bracket is rotatably connected with a rotating shaft, the rotating shaft is provided with a transmission gear engaged with the rack, the transmission gear is connected with the rotating shaft through a ratchet mechanism, and the rotating shaft rotates synchronously with the transmission shaft through a bevel gear set.

[0017] In order to improve the shaping efficiency, preferably, a cooling mechanism is further included, which comprises: a water collecting groove with an opening at the top, the water collecting groove is arranged at the discharge end of the outer wall shaping pipe, and the water collecting groove is fixedly connected with a roller bracket; a water pump fixedly connected to the base, the input end of the water pump is fixedly connected with a first water pipe extending into the water collecting groove, the output end of the water pump is fixedly connected with a second water pipe, and the output end of the second water pipe is connected with the input end of the shunt tank.

[0018] In order to facilitate the drying of the pipeline, preferably, the drying mechanism group in step six includes a drying box fixedly connected to the side wall of the roller bracket, the two sides of the drying box are both connected with box doors through lifting and sliding, the top of the drying box is fixedly connected with a second hydraulic cylinder, the output end of the second hydraulic cylinder is fixedly connected with a connecting bracket, and the connecting bracket is fixedly connected with the two box doors.

[0019] In order to reduce pollution, preferably, the treatment tank in step four includes a tank body, the tank body is fixedly connected with a heat exchanger, and the tank body is filled with a neutralizing liquid for neutralizing exhaust gas.

[0020] In order to facilitate the transmission of exhaust gas, preferably, the installation cylinder is sequentially provided with an impeller cavity and an air cavity from top to bottom, the installation cylinder is rotatably connected with an installation shaft, the installation shaft is fixedly connected with a blade in the impeller cavity, and the installation shaft is fixedly connected with a fan blade in the air cavity, the second water pipe passes through the impeller cavity and communicates with the impeller cavity; the output end of the extruder in step one is connected with the input end of the shaping machine in step two through a connecting pipe, the connecting pipe is connected with the feeding pipe, the installation cylinder is fixedly connected to the top of the connecting pipe, the input end of the air cavity communicates with the connecting pipe, and the output end of the air cavity communicates with the tank body through an exhaust pipe.

[0021] In order to facilitate the transmission of airflow, preferably, the output end of the drying box is fixedly connected with a fan, the input end of the fan is connected with the output end of the drying box, the output end of the fan is fixedly connected with a first air pipe, the first air pipe passes through the feeding pipe and is connected with the input end of the heat exchanger, a vibrating piece is fixedly connected to the first air pipe, one end of the vibrating piece extends into the feeding pipe of the outer wall shaping pipe, and the other end extends into the first air pipe, and the output end of the heat exchanger is connected with the input end of the drying box through a second air pipe.

[0022] In order to facilitate the pipeline into the drying box, preferably, the pusher mechanism group includes a mounting plate fixedly connected to the side wall of the roller frame, a limiting rod slidingly connected to the mounting plate, a push plate fixedly connected to the limiting rod, and a third hydraulic cylinder fixedly connected to the mounting plate, with the output end of the third hydraulic cylinder being connected with the push plate and the fixed part.

[0023] Compared with the prior art, the application provides a processing method of a polyvinyl chloride silent drainage pipe.

[0024] 1. The processing method of the polyvinyl chloride silent drainage pipe, by completing the forming of the double-layer pipe at one time, greatly simplifies the production process, improves the production efficiency, controls the temperature and the plastic machine, ensures the consistency and quality stability of the product, and improves the product quality and reliability.

[0025] 2. The processing method of the polyvinyl chloride silent drainage pipe, through the automatic production process, can reduce manual operation, reduce labor intensity, and improve production efficiency.

[0026] 3. The processing method of the polyvinyl chloride silent drainage pipe, through the combination of the heat exchanger and the fan, can realize the recycling and reuse of waste heat, reduce the waste of energy, and improve the energy utilization efficiency.

[0027] 4. The processing method of the polyvinyl chloride silent drainage pipe, through the cooperation of the circulating gas and the vibration piece to generate vibration to remove bubbles in the molten liquid, improves the quality of the pipe, ensures the stability and consistency of the final product, promotes waste gas emission, and improves the waste gas treatment effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A three-dimensional structure schematic of a processing equipment for the processing method of the polyvinyl chloride silent drainage pipe Figure 1 ;

[0029] Figure 2 A three-dimensional structure schematic of a processing equipment for the processing method of the polyvinyl chloride silent drainage pipe Figure 2 ;

[0030] Figure 3 A structure schematic of part A of the processing method of the polyvinyl chloride silent drainage pipe Figure 2 ;

[0031] Figure 4 A structure schematic of a plastic machine for the processing method of the polyvinyl chloride silent drainage pipe Figure 1 ;

[0032] Figure 5Processing method of polyvinyl chloride mute drainage pipe Figure 4 Structure schematic diagram of middle B part

[0033] Figure 6 Processing method of polyvinyl chloride mute drainage pipe Figure 4 Structure schematic diagram of middle C part

[0034] Figure 7 Structure schematic diagram of plastic forming machine of processing method of polyvinyl chloride mute drainage pipe Figure 2

[0035] Figure 8 Processing method of polyvinyl chloride mute drainage pipe Figure 7 Structure schematic diagram of middle D part

[0036] Figure 9 Structure schematic diagram of installation cylinder of processing method of polyvinyl chloride mute drainage pipe Figure 1

[0037] Figure 10 Structure schematic diagram of installation cylinder of processing method of polyvinyl chloride mute drainage pipe Figure 2

[0038] Figure 11 Processing equipment of processing method of polyvinyl chloride mute drainage pipe

[0039] Figure 12 Flow chart of processing method of polyvinyl chloride mute drainage pipe

[0040] In the figure: 1, extruder; 2, plastic forming machine; 3, drying box; 4, processing tank; 5, installation plate; 6, base; 7, outer wall plastic tube; 8, sliding groove; 9, shunt box; 10, partition hole plastic tube; 11, pushing block; 12, installation ring; 13, first hydraulic cylinder; 14, tube hole plastic tube; 15, transmission shaft; 16, installation block; 17, thread opening block; 18, rack; 19, mounting frame; 20, rotating shaft; 21, transmission gear; 22, ratchet mechanism; 23, bevel gear set; 24, feeding pipe; 25, connecting pipe; 26, installation cylinder; 27, impeller cavity; 28, air cavity; 29, installation shaft; 30, blade; 31, fan blade; 32, water collecting tank; 33, water pump; 34, first water pipe; 35, second water pipe; 36, roller frame; 37, push plate; 38, box door; 39, second hydraulic cylinder; 40, connecting frame; 41, tank body; 42, heat exchanger; 43, fan; 44, first air pipe; 45, vibration piece; 46, second air pipe; 47, limiting rod; 48, third hydraulic cylinder; 49, exhaust pipe. ​​​DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Embodiment:

[0043] With reference to Figure 12 A processing method of a polyvinyl chloride mute drainage pipe, comprising the following steps:

[0044] Step one, hot melting, putting the raw materials into the extruder 1 to perform hot melting extrusion;

[0045] Step two, shaping, transmitting the liquid raw materials hot melted by the extruder 1 into the internal shaping machine 2 to form a double-layer hole pipe;

[0046] Step three, cutting, cutting the pipe after solidification by using the cutting machine;

[0047] Step four, waste gas treatment, discharging the waste gas generated by hot melting of the raw materials into the treatment tank 4 to perform neutralization;

[0048] Step five, drying, pushing the pipe after cutting into the internal drying mechanism group by using the pushing mechanism group, and transmitting the heat generated by the neutralized waste gas to the drying mechanism group to dry the pipe;

[0049] Step six, taking out the dried pipe from the internal drying machine.

[0050] With reference to Figures 1-8, the shaping machine 2 in step two comprises: a base 6, the outer wall shaping pipe 7 is fixedly connected on the base 6, the shunt box 9 is fixedly connected on the outer wall shaping pipe 7, the shunt box 9 extends into the outer wall shaping pipe 7 and is fixedly connected with the partition hole shaping pipe 10; the pipe hole shaping pipe 14 is fixedly connected on the shunt box 9 and extends into the outer wall shaping pipe 7, and the pipe hole shaping pipe 14 is coaxial with the outer wall shaping pipe 7; the pushing block 11 is slidingly connected in the outer wall shaping pipe 7 and is slidingly connected with the partition hole shaping pipe 10 and the pipe hole shaping pipe 14; the transmission shaft 15 is rotatably connected on the pipe hole shaping pipe 14, the mounting block 16 is fixedly connected on the transmission shaft 15, and the thread opening block 17 is fixedly connected on the mounting block 16; the driving part is arranged on the base 6, the output end of the driving part is connected with the pushing block 11, and the driving part comprises the first hydraulic cylinder 13 fixedly connected on the base 6, the output end of the first hydraulic cylinder 13 is fixedly connected with the mounting ring 12, the sliding groove 8 is arranged on the outer wall shaping pipe 7, the connecting end of the mounting ring 12 passes through the sliding groove 8 and is fixedly connected with the pushing block 11, the rack 18 is fixedly connected on the mounting ring 12, the mounting frame 19 is fixedly connected on the shunt box 9, the rotating shaft 20 is rotatably connected on the mounting frame 19, the transmission gear 21 meshing with the rack 18 is arranged on the rotating shaft 20, the transmission gear 21 is connected with the rotating shaft 20 through the ratchet mechanism 22, and the rotating shaft 20 is synchronously rotated with the transmission shaft 15 through the bevel gear set 23.

[0051] The first hydraulic cylinder 13 is started, the mounting ring 12 is driven to reciprocate in the sliding groove 8 through the first hydraulic cylinder 13, so that the pushing block 11 is driven to reciprocate in the outer wall shaping pipe 7, when the pushing block 11 moves in the direction of the pipe opening of the outer wall shaping pipe 7, the rack 18 drives the transmission gear 21 to rotate, the transmission gear 21 drives the rotating shaft 20 to rotate through the ratchet mechanism 22, the rotating shaft 20 drives the transmission shaft 15 to rotate through the bevel gear set 23, the transmission shaft 15 drives the mounting block 16 to rotate, the mounting block 16 drives the thread opening block 17 to rotate, and the pushing block 11 pushes the polyvinyl chloride solution to move in the outer wall shaping pipe 7; in this process, the polyvinyl chloride material is shaped through the partition hole shaping pipe 10, the pipe hole shaping pipe 14 and the outer wall shaping pipe 7, and a pipeline with two-layer cavities is extruded; along with the movement of the pipeline in the outer wall shaping pipe 7, when the pipeline moves to the position of the thread opening block 17, the pipeline is lowered to 60-70 degrees Celsius, at this time, the pipeline is hardened and has a certain plasticity, and the rotating thread opening block 17 rotates on the inner wall of the pipeline to form a clamping groove, and cooperates with the pushing block 11 to form a spiral groove.

[0052] Compared with the traditional double-layer pipeline production process which needs to produce two pipelines respectively and then perform hot melting and jointing, the device can complete the forming of the double-layer pipeline at one time, greatly simplifies the production process and improves the production efficiency.

[0053] The traditional double-layer pipeline production needs additional hot-melt joint materials, and the integrated forming method can save joint materials and reduce production costs;

[0054] In the production process of the integrated double-layer vacuum pipeline, the consistency and quality stability of the product can be ensured by controlling the temperature and the shaping machine 2 structure, thereby improving the product quality and reliability;

[0055] The automatic production process can reduce manual operation, reduce labor intensity, and improve production efficiency;

[0056] Therefore, the integrated double-layer vacuum pipeline processing method using the device can improve production efficiency, reduce costs, and improve product quality.

[0057] Reference Figure 1 , Figure 3 , Figure 4 , and the cooling mechanism includes: a water receiving groove 32 with an opening at the top, the water receiving groove 32 is arranged at the discharge end of the outer wall shaping pipe 7, and the water receiving groove 32 is fixedly connected with a roller shaft frame 36; a water pump 33 fixedly connected to the base 6, the input end of the water pump 33 is fixedly connected with a first water pipe 34 extending into the water receiving groove 32, and the output end of the water pump 33 is fixedly connected with a second water pipe 35, and the output end of the second water pipe 35 is connected with the input end of the flow divider box 9.

[0058] Start the water pump 33, the water pump 33 sucks water in the water receiving groove 32 through the first water pipe 34, then transmits it to the flow divider box 9 through the second water pipe 35, and finally sprays it into the water receiving groove 32 through the flow divider box 9. In the process of flowing in the flow divider box 9, the water absorbs the heat of the polyvinyl chloride melt to solidify and form a pipeline.

[0059] Reference Figures 1-11, the drying mechanism group of step six comprises a drying box 3 fixedly connected to the side wall of the roller frame 36, both sides of the drying box 3 are slidably connected with box doors 38, the top of the drying box 3 is fixedly connected with a second hydraulic cylinder 39, the output end of the second hydraulic cylinder 39 is fixedly connected with a connecting frame 40, the connecting frame 40 is fixedly connected with the two box doors 38, the processing tank 4 of step four comprises a tank body 41, the tank body 41 is fixedly connected with a heat exchanger 42, the tank body 41 is filled with neutralizing liquid (sodium hydroxide (NaOH), potassium hydroxide (KOH) and other alkaline substances, in this embodiment, sodium hydroxide (NaOH) is preferred, wherein HCl (g) + NaOH (aq) → NaCl (aq) + H2O (l) + heat) for neutralizing the exhaust gas, the installation cylinder 26 is sequentially provided with an impeller cavity 27 and an air cavity 28 from top to bottom, the installation cylinder 26 is rotatably connected with an installation shaft 29, the installation shaft 29 extends into the impeller cavity 27 and is fixedly connected with a leaf plate 30, the installation shaft 29 extends into the air cavity 28 and is fixedly connected with a fan blade 31, the second water pipe 35 passes through the impeller cavity 27 and communicates with the impeller cavity 27; the output end of the extruder 1 of step one is connected with the connecting pipe 25, the input end of the plastic forming machine 2 of step two is fixedly connected with a feeding pipe 24, the connecting pipe 25 is connected with the feeding pipe 24, the installation cylinder 26 is fixedly connected to the top of the connecting pipe 25, the input end of the air cavity 28 communicates with the connecting pipe 25, the output end of the air cavity 28 communicates with the tank body 41 through an exhaust pipe 49, the output end of the drying box 3 is fixedly connected with a fan 43, the input end of the fan 43 is connected with the output end of the drying box 3, the output end of the fan 43 is fixedly connected with a first gas pipe 44, the first gas pipe 44 passes through the feeding pipe 24 and is connected with the input end of the heat exchanger 42, the first gas pipe 44 is fixedly connected with a vibrating piece 45, one end of the vibrating piece 45 extends into the feeding pipe 24 of the outer wall plastic forming pipe 7, the other end extends into the first gas pipe 44, the output end of the heat exchanger 42 is connected with the input end of the drying box 3 through a second gas pipe 46, the pushing mechanism group comprises a mounting plate 5 fixedly connected to the side wall of the roller frame 36, a limiting rod 47 slidably connected to the mounting plate 5, a push plate 37 fixedly connected to the limiting rod 47, a third hydraulic cylinder 48 fixedly connected to the mounting plate 5, and the output end of the third hydraulic cylinder 48 is fixedly connected with the push plate 37.

[0060] When the pipe is cut off by using the cutting machine, the second hydraulic cylinder 39 is started, the output end of the second hydraulic cylinder 39 is extended, the connecting frame 40 is lifted, the connecting frame 40 drives the two box doors 38 to open, then the third hydraulic cylinder 48 is started, the third hydraulic cylinder 48 drives the push plate 37 to slide, the cut-off pipe is pushed into the drying box 3, and another dried pipe in the drying box 3 is discharged at the same time (the drying box 3 can store 3-10 pipes), then the push plate 37 and the box door 38 are reset, and the plastic forming machine 2 continuously produces pipes,

[0061] In this process, the water pump 33 continues to transmit cooling water, when the cooling water through the impeller cavity 27, push the leaf plate 30 rotation, the leaf plate 30 drive installation shaft 29 rotation, installation shaft 29 drive fan blade 31 rotation, fan blade 31 suction polyvinyl chloride melt in the connecting pipe 25 spread of hydrochloric acid gas, then through the exhaust pipe 49 discharge to the tank 41 in the (NaOH) solution, then the two neutralization reaction occurs heat to heat exchanger 42 heating;

[0062] Start the fan 43, the fan 43 extraction dry box 3 in the air through the first gas pipe 44 discharge to the heat exchanger 42 in the heat exchanger 42 on the heat formed hot air, then discharge to dry box 3 in the pipe for hot air dry, accelerate pipe drying, fan 43 exhaust gas through the vibration piece 45, with the vibration piece 45 generated by friction drive vibration piece 45 vibration, vibration piece 45 generated by the vibration conduction to polyvinyl chloride melt, remove the bubbles in the melt, improve the quality of the final shaping pipe, at the same time, the bubbles in the melt is up to be extracted by fan blade 31, further improve the treatment effect of waste gas.

[0063] High degree of automation: the use of hydraulic cylinder and automatic control system, the whole process of automation operation, reduces the manual intervention, improves the production efficiency.

[0064] Energy saving: through the combination of heat exchanger 42 and fan 43, can realize the recovery and reuse of waste heat, reduces the waste of energy, improves the energy utilization efficiency.

[0065] Good environmental performance: through the waste gas treatment system, can effectively handle and purify the waste gas produced in the production process, reduces the pollution to the environment, meets the modern environmental protection requirements.

[0066] High production efficiency: the whole production line realizes the automation operation, not only improves the production efficiency, but also reduces the influence of human factors on product quality.

[0067] Production quality stability: through the vibration of the vibration piece 45 to remove the bubbles in the melt, improve the quality of the pipe, ensure the stability and consistency of the final product.

[0068] The above described, only for the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this, any skilled in the art of the technical personnel in the technical range disclosed by the present application, according to the technical scheme of the present application and the invention concept of equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A method of processing a polyvinyl chloride sound attenuation drain pipe, characterized by, It comprises the following steps: Step one, hot melt, put the raw materials into the extruder (1) for hot melt extrusion; Step two, shaping, the liquid raw material melted by the extruder (1) is transmitted to the inside of the shaping machine (2) to form a double-layer middle-hole pipeline; Step three, cutting, the pipeline after solidification is cut off by using the cutting machine; Step four, waste gas treatment, the waste gas generated by the hot melting of the raw materials is discharged into the treatment tank (4) for neutralization; Step five, drying, the cut pipeline is pushed into the inside of the drying mechanism group by the pushing mechanism group, and the heat generated by the neutralization of the waste gas is transmitted to the drying mechanism group to dry the pipeline; Step six, the dried pipeline is taken out from the inside of the drying machine; The shaping machine (2) in step two comprises: A base (6) is fixedly connected with an outer wall shaping pipe (7), the outer wall shaping pipe (7) is fixedly connected with a shunt box (9), the shunt box (9) is fixedly connected with a partition hole shaping pipe (10) extending into the outer wall shaping pipe (7); A pipe inner hole shaping pipe (14) is fixedly connected with the shunt box (9) and extends into the outer wall shaping pipe (7), the pipe inner hole shaping pipe (14) is coaxial with the outer wall shaping pipe (7); A pushing block (11) is slidingly connected in the outer wall shaping pipe (7) and slidingly connected with the partition hole shaping pipe (10) and the pipe inner hole shaping pipe (14); A transmission shaft (15) is rotatably connected with the pipe inner hole shaping pipe (14), the transmission shaft (15) is fixedly connected with a mounting block (16), and the mounting block (16) is fixedly connected with a threaded block (17); A driving part is arranged on the base (6), and an output end of the driving part is connected with the pushing block (11); The driving part comprises a first hydraulic cylinder (13) fixedly connected with the base (6), an output end of the first hydraulic cylinder (13) is fixedly connected with a mounting ring (12), a sliding groove (8) is formed in the outer wall shaping pipe (7), and a connecting end of the mounting ring (12) penetrates through the sliding groove (8) and is fixedly connected with the pushing block (11); A rack (18) is fixedly connected with the mounting ring (12), an installation rack (19) is fixedly connected with the shunt box (9), a rotating shaft (20) is rotatably connected with the installation rack (19), the rotating shaft (20) is provided with a transmission gear (21) engaged with the rack (18), the transmission gear (21) is connected with the rotating shaft (20) through a ratchet mechanism (22), and the rotating shaft (20) is synchronously rotated with the transmission shaft (15) through a bevel gear set (23).

2. The method of claim 1, wherein the polyvinyl chloride sound attenuation drain pipe is formed by extrusion molding. It also comprises a cooling mechanism, which comprises: A water collecting groove (32) is arranged at the top of the outer wall shaping pipe (7), and the water collecting groove (32) is arranged at the discharging end of the outer wall shaping pipe (7), the water collecting groove (32) is fixedly connected with a roller shaft frame (36); A water pump (33) is fixedly connected with the base (6), an input end of the water pump (33) is fixedly connected with a first water pipe (34) extending into the water collecting groove (32), an output end of the water pump (33) is fixedly connected with a second water pipe (35), and the output end of the second water pipe (35) is connected with the input end of the shunt box (9).

3. A method of processing a polyvinyl chloride sound drain pipe according to claim 2, characterized in that, The drying mechanism group of step six comprises a drying box (3) fixedly connected to the side wall of the roller frame (36), both sides of the drying box (3) are slidably connected with box doors (38), the top of the drying box (3) is fixedly connected with a second hydraulic cylinder (39), the output end of the second hydraulic cylinder (39) is fixedly connected with a connecting frame (40), and the connecting frame (40) is fixedly connected with the two box doors (38).

4. The method of processing a polyvinyl chloride sound drain pipe according to claim 3, wherein The processing tank (4) of step four comprises a tank body (41), the tank body (41) is fixedly connected with a heat exchanger (42), and the tank body (41) is filled with neutralizing liquid for neutralizing waste gas.

5. The method of processing a polyvinyl chloride sound drain pipe according to claim 4, wherein The mounting cylinder (26) is sequentially provided with an impeller cavity (27) and an air cavity (28) from top to bottom, the mounting cylinder (26) is rotatably connected with a mounting shaft (29), the mounting shaft (29) is fixedly connected with a vane (30) extending into the impeller cavity (27), and the mounting shaft (29) is fixedly connected with a fan blade (31) extending into the air cavity (28); the second water pipe (35) passes through and communicates with the impeller cavity (27); The output end of the extruder (1) is connected with a connecting pipe (25), the input end of the plastic forming machine (2) is fixedly connected with a feeding pipe (24), the connecting pipe (25) is connected with the feeding pipe (24), the mounting cylinder (26) is fixedly connected to the top of the connecting pipe (25), and the input end of the air cavity (28) communicates with the connecting pipe (25); the output end of the air cavity (28) communicates with the tank body (41) through an exhaust pipe (49).

6. The method of processing a polyvinyl chloride sound drain pipe according to claim 3, wherein The output end of the drying box (3) is fixedly connected with a fan (43), the input end of the fan (43) is connected with the output end of the drying box (3), the output end of the fan (43) is fixedly connected with a first air pipe (44), the first air pipe (44) passes through the feeding pipe (24) and is connected with the input end of the heat exchanger (42), the first air pipe (44) is fixedly connected with a vibrating piece (45), one end of the vibrating piece (45) extends into the feeding pipe (24) of the outer wall plastic forming pipe (7), and the other end extends into the first air pipe (44), and the output end of the heat exchanger (42) is connected with the input end of the drying box (3) through a second air pipe (46).

7. The method of claim 3, wherein the polyvinyl chloride sound attenuation drain pipe is formed by extrusion. The pushing mechanism group comprises a mounting plate (5) fixedly connected to the side wall of the roller frame (36), a limiting rod (47) slidably connected to the mounting plate (5), a push plate (37) fixedly connected to the limiting rod (47), and a third hydraulic cylinder (48) fixedly connected to the mounting plate (5), wherein the output end of the third hydraulic cylinder (48) is fixedly connected with the push plate (37).

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