CN110281499B

CN110281499B - Production process of high-strength injection molding pipe fitting

Info

Publication number: CN110281499B
Application number: CN201910501574.XA
Authority: CN
Inventors: 申建
Original assignee: Anhui Yingbiao New Materials Technology Co ltd
Current assignee: Anhui Yingbiao New Materials Technology Co ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2021-05-18
Anticipated expiration: 2039-06-11
Also published as: CN110281499A

Abstract

The invention discloses a production process of a high-strength injection molding pipe fitting, which comprises the steps of material preparation, stirring, blank extrusion, vacuum shaping and fixed-length cutting; according to the invention, the tensile strength and toughness of the injection pipe fitting can be greatly improved by adding the modified polyvinyl chloride resin in the production process of the injection pipe fitting, the prepared injection pipe fitting has higher surface finish by adding the fluoroelastomer processing aid, the two are combined, the quality of the produced injection pipe fitting is effectively improved, the injection pipe fitting is extruded by using machinery instead of manpower, the components in the raw materials can be uniformly mixed with each other, the extruded blank is more uniform and fine, the whole blank extrusion process is fully automatic, the production efficiency is greatly improved, the labor intensity is effectively reduced, the rotating performance of the extrusion screw is better, the energy consumption and the loss of the extrusion screw are reduced, the connection between the end part of the discharge hopper and the storage cabinet is convenient, and the operation is convenient.

Description

Production process of high-strength injection molding pipe fitting

Technical Field

The invention belongs to the technical field of injection molding pipe fitting production, and particularly relates to a production process of a high-strength injection molding pipe fitting.

Background

Patent No. CN1186382C discloses a high-strength porous sleeve and pipe fitting made of nano-polyvinyl chloride and its production method, its main component is nano-CaCO₃Special resin for in-situ polymerization with vinyl chloride monomer, heat stabilizer, lubricant, impact modifier, processing modifier and flame retardant; the method for producing the casing comprises the following process steps in sequence: proportioning, stirring, extruding, vacuum shaping, cutting to a fixed length, inspecting, packaging and warehousing. With the development of economy, the biggest hotspot of agricultural water delivery and distribution is the wide application of novel pipes and pipe fittings. People's requirement to irrigation water utilization efficiency is higher and higher, especially the reasonable selection of pipe fitting plays crucial effect to guaranteeing the safe and stable operation of water distribution pipe network. At present, the common pipe fittings for agricultural water delivery and distribution mainly comprise three types, namely injection molding pipe fittings, metal pipe fittings and composite pipe fittings, the existing injection molding pipe fittings are formed by compounding raw materials of all components in a production process, the tensile strength is not high, the toughness is not strong, the surface smoothness is not enough, spots are easy to appear on the surface, the production quality of the injection molding pipe fittings is seriously influenced, and the injection molding pipe fittings are easy to crack due to long-term use, have short service life and increase the production cost;

the existing injection molding pipe fitting has certain defects in the production process, the production efficiency is low, extruded blanks are not uniform and small enough, components in the raw materials are not uniformly mixed, an extrusion screw is easy to damage due to long-time rotation, and the connection between a hopper and a storage cabinet is inconvenient to discharge, so that the inconvenience is brought to workers, and the labor intensity is increased.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a production process of a high-strength injection molding pipe fitting, which specifically solves the following problems:

(1) the traditional injection molding pipe fitting has insufficient tensile strength and toughness, the surface of the injection molding pipe fitting is rough, and the quality cannot be ensured;

(2) in the process of extruding ingredients, the materials cannot be extruded circularly, the extruded ingredients are insufficient in uniformity and large in particle size, and the production efficiency is low;

(3) the energy consumption and the loss of each part are large, so that the service life of each part is short, and the production cost is increased.

The purpose of the invention can be realized by the following technical scheme:

a production process of a high-strength injection molding pipe fitting specifically comprises the following steps:

preparing materials: uniformly mixing 80 parts by weight of modified polyvinyl chloride resin, 4-6 parts by weight of heat stabilizer, 3-5 parts by weight of flame retardant, 2-3 parts by weight of processing modifier, 2-4 parts by weight of lubricant and 4-8 parts by weight of fluoroelastomer processing aid to obtain a mixture a;

stirring: adding the mixture a into a high-speed stirrer, stirring, increasing the temperature to 100 ℃ at the speed of 10 ℃/min, then placing the mixture into a cooling mixer, stirring, and cooling to 40 ℃ at the speed of 5 ℃/min to obtain a mixture b;

extruding a blank: the mixture b is added into an extruder barrel through a feeding port, wherein the feeding port is communicated with the extruder barrel, a driving motor is started to rotate, a matching chain drives an extrusion screw to rotate, the extrusion screw penetrates through a first bracket, a second bracket and a bearing sleeve, balls in the bearing sleeve promote the extrusion screw to rotate, so that a rotary pressing sheet circularly extrudes raw materials in the extruder barrel, all components in the mixture b are uniformly mixed with each other, the mixture b continuously moves rightwards along with the rotation of the rotary pressing sheet, a blank is extruded by matching with a material guide screw, a connecting rod is connected between the material guide screw and a connecting block to ensure the stability of the material guide screw in rotation, the material guide screw slides on a sliding groove through a sliding block to drive a discharging hopper to discharge the blank, the sliding block is combined with the sliding groove, and the discharging hopper can move leftwards and rightwards;

shaping a mold: injecting the extruded blank into a molding machine for molding to obtain a molded injection pipe fitting;

and (3) fixed-length cutting: and cutting the formed injection molding pipe fitting by a fixed length to obtain the injection molding pipe fittings with different specifications.

As a further scheme of the invention: the modified polyvinyl chloride resin in the material mixing step is prepared from the following raw materials in parts by weight: 4-6 parts of nano calcium carbonate, 60-72 parts of chlorinated polyvinyl chloride resin powder and 5-7 parts of polyvinyl chloride resin.

As a further scheme of the invention: in the step of batching, the heat stabilizer adopts a phosphite ester stabilizing system, the flame retardant adopts antimony trioxide, the processing modifier adopts an acrylate modifier, and the lubricant adopts one of metal soaps and stearic acid.

As a further scheme of the invention: in the step of batching, the fluoroelastomer processing aid is a fluorocarbon high polymer, comprises a fluorocarbon copolymer and a homopolymer, and is a copolymer or a homopolymer of at least one or more monomers of tetrafluoroethylene, hexafluoroethylene and vinylidene fluoride.

As a further scheme of the invention: in the stirring step, the rotating speed of the high-speed stirrer is controlled at 450r/min, and the rotating speed of the cooling mixer is controlled at 120 r/min.

As a further scheme of the invention: in the vacuum shaping step, the temperature of the shaping machine is changed twice, firstly, the temperature is controlled to rise to 150 ℃ at a constant speed of 15 ℃/min, then to rise to 240 ℃ at a constant speed of 5 ℃/min, and secondly, the temperature is controlled to fall to 30-50 ℃ at a constant speed of 25 ℃/min.

As a further scheme of the invention: when the extruder is used in the step of extruding the blank, firstly, the stirred raw materials are placed in an extruder barrel through a feeding port, wherein the feeding port is communicated with the extruder barrel, the driving motor is started to rotate, the extrusion screw is driven to rotate by matching with the chain, the extrusion screw penetrates through the first bracket, the second bracket and the bearing sleeve, the ball arranged in the bearing sleeve promotes the rotation of the extrusion screw, so that the rotary tablet is circulated in the extruder barrel to extrude the raw material, the components in the raw material are uniformly mixed with each other, and the raw materials move rightwards continuously along with the rotation of the rotary pressing sheet, and are matched with the material guide screw rod to extrude the blank, wherein a connecting rod is connected between the material guiding screw rod and the connecting block, so that the material guiding screw rod is more stable in rotation, secondly slide on the spout through the slider, drive out the hopper and discharge the blank, wherein the slider combines together with the spout, goes out the hopper and can remove about and link up with the cabinet.

The invention has the beneficial effects that:

1. in the process of preparing the mixture a, after the polyvinyl chloride resin is chlorinated, the irregularity of molecular chain arrangement is increased, the polarity is increased, the solubility of the resin is increased, and the chemical stability is increased, so that the heat resistance and the corrosion resistance of acid, alkali, salt, oxidant and the like of the material are improved.

2. In the production process of the extrusion blank of the injection molding pipe fitting, the extruder is controlled to extrude the blank to the raw materials after stirring through the control panel, utilize machinery to replace manpower to extrude, under the action of a driving motor, the cooperation chain drives the extrusion screw to rotate, make the rotatory preforming extrude the raw materials at the extruder barrel inner loop, make in the raw materials each component can the misce bene each other, the rotatory preforming can drive the raw materials and move right in the extruded, cooperation three group of tiny guide screws with the specification derive the blank, make the extrusion blank more even tiny, and the whole extrusion blank process is complete automation, the production efficiency is greatly improved, the effectual intensity of labour that reduces, therefore, the clothes hanger is strong in practicability.

3. In-process of utilizing the extruder to extrude the blank, it is better to distribute the rotation performance that can make extrusion screw through distributing the ball in the bearing housing, reduce energy consumption and extrusion screw's loss, better guard action has, the slider combines together with the spout, can be convenient for install and dismantle a hopper, be convenient for go out the hopper and slide on braced frame simultaneously, make out the hopper tip can link up with between the cabinet, convenient operation, and go out the buffering dog and the braced frame pillar gomphosis of hopper right-hand member both sides, can prevent out hopper landing braced frame and can reduce the friction between hopper and the braced frame, and is comparatively practical.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a flow chart of the production process of the present invention.

FIG. 2 is a schematic view showing the overall structure of the extruder of the present invention.

FIG. 3 is a schematic view of a partial structure of an extruder in the present invention.

Fig. 4 is a top view of fig. 3 of the present invention.

Fig. 5 is a schematic structural view of the second stent of the present invention.

Fig. 6 is a schematic view of the installation of the discharge hopper of the present invention.

FIG. 1, a support frame; 2. an outer frame; 3. a feeding port; 4. a chain guard; 5. a drive motor; 6. a discharge hopper; 7. a first bracket; 8. a second bracket; 9. a carrier plate; 10. a bearing housing; 11. extruding the screw; 12. carrying out rotary tabletting; 13. a chain; 14. a joining block; 15. a material guiding screw rod; 16. a slider; 17. a connecting rod; 18. mounting a circular plate; 19. a channel; 20. a chute; 21. buffer stop block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 6, a process for producing a high-strength injection-molded pipe, the process specifically includes the steps of:

preparing materials: mixing 60 parts by weight of modified polyvinyl chloride resin, 5 parts by weight of heat stabilizer, 4 parts by weight of flame retardant, 2 parts by weight of processing modifier, 3 parts by weight of lubricant and 5 parts by weight of fluoroelastomer processing aid to prepare;

stirring: stirring the prepared raw materials in a high-speed stirrer, controlling the temperature to rise to 100 ℃ at the speed of 10 ℃/min, stirring in a cooling mixer again, and cooling to 40 ℃ at the speed of 5 ℃/min by a controller;

extruding a blank: the stirred raw materials are placed in an extruder barrel through a material inlet 3, wherein the material inlet 3 is communicated with the extruder barrel, a driving motor 5 is started to rotate, a chain 13 is matched to drive an extrusion screw 11 to rotate, the extrusion screw 11 penetrates through a first bracket 7, a second bracket 8 and a bearing sleeve 10, balls in the bearing sleeve 10 promote the extrusion screw 11 to rotate, so that a rotary pressing sheet 12 circularly extrudes the raw materials in the extruder barrel, all components in the raw materials are uniformly mixed, the raw materials continuously move rightwards along with the rotation of the rotary pressing sheet 12, and a blank is extruded through a material guide screw 15;

shaping a mold: injecting the extruded blank into a molding machine by using an injection molding mechanism for molding;

and (3) fixed-length cutting: and cutting the molded injection-molded pipe fitting by a cutting machine at a fixed length to obtain the injection-molded pipe fittings with different specifications.

Example 2

The production process of the high-strength injection molding pipe fitting comprises the following specific steps:

preparing materials: mixing 80 parts by weight of modified polyvinyl chloride resin, 6 parts by weight of heat stabilizer, 5 parts by weight of flame retardant, 3 parts by weight of processing modifier, 4 parts by weight of lubricant and 7 parts by weight of fluoroelastomer processing aid to prepare;

The modified polyvinyl chloride resin in the material mixing step is prepared from the following raw materials in parts by weight: 4-6 parts of nano calcium carbonate, 60-72 parts of chlorinated polyvinyl chloride resin powder and 5-7 parts of polyvinyl chloride resin.

In the step of batching, the heat stabilizer adopts a phosphite ester stabilizing system, the flame retardant adopts antimony trioxide, the processing modifier adopts an acrylate modifier, and the lubricant adopts one of metal soaps and stearic acid.

In the step of batching, the fluoroelastomer processing aid is a fluorocarbon high polymer, comprises a fluorocarbon copolymer and a homopolymer, and is a copolymer or a homopolymer of at least one or more monomers of tetrafluoroethylene, hexafluoroethylene and vinylidene fluoride.

In the stirring step, the rotating speed of the high-speed stirrer is controlled at 450r/min, and the rotating speed of the cooling mixer is controlled at 120 r/min.

In the vacuum shaping step, the temperature of the shaping machine is changed twice, firstly, the temperature is controlled to rise to 150 ℃ at a constant speed of 15 ℃/min, then to rise to 240 ℃ at a constant speed of 5 ℃/min, and secondly, the temperature is controlled to fall to 30-50 ℃ at a constant speed of 25 ℃/min.

When the extruder is used in the step of extruding the blank, firstly, the stirred raw materials are placed in an extruder barrel through a material inlet 3, wherein the material inlet 3 is communicated with the extruder barrel, a driving motor 5 is started to rotate, a matching chain 13 drives an extrusion screw 11 to rotate, the extrusion screw 11 penetrates through a first bracket 7, a second bracket 8 and a bearing sleeve 10, balls arranged in the bearing sleeve 10 drive the extrusion screw 11 to rotate, so that a rotary pressing sheet 12 circularly extrudes the raw materials in the extruder barrel, components in the raw materials are uniformly mixed, the raw materials continuously move rightwards along with the rotation of the rotary pressing sheet 12, the blank is extruded through a material guide screw 15, wherein a connecting rod 17 is connected between the material guide screw 15 and a connecting block 14, so that the material guide screw 15 is more stable in rotation, and then slides on a sliding chute 20 through a sliding block 16 to drive a material outlet hopper 6 to discharge the blank, the sliding block 16 is combined with the sliding groove 20, and the discharging hopper 6 can move left and right to be connected with the storage cabinet.

The extruder comprises a supporting frame 1, an outer frame 2 is installed at the upper end of the supporting frame 1, a feeding port 3 is arranged at the position, close to the left end, of the outer frame 2, a machine barrel is arranged in the outer frame 2, the machine barrel is communicated with the feeding port 3, a chain protective cover 4 is installed on one side of the outer frame 2, a driving motor 5 is installed at one side of the bottom end of the chain protective cover 4, a discharging hopper 6 is installed on the supporting frame 1, the discharging hopper 6 is located at the bottom end of the right side of the outer frame 2, a first support 7 and a second support 8 are installed on two sides of the upper end of the supporting frame 1 in parallel, a bearing plate 9 is arranged at the parallel position, far away from one side of the first support 7, of the second support 8, a bearing sleeve 10 is installed at the middle position of the upper end of the bearing plate 9, and balls are distributed, An extrusion screw 11 is connected to the second bracket 8 and the bearing sleeve 10, a rotary pressing sheet 12 is arranged on the extrusion screw 11, the rotary pressing sheet 12 can circularly extrude the raw material in the extruder barrel to promote the components in the raw material to be uniformly mixed, a chain 13 is sleeved at the left end of the extrusion screw 11, and a sliding block 16 is arranged across the supporting frame 1;

no. two support 8 side intermediate positions are installed and are linked up piece 14, it is provided with installation plectane 18 all around to link up piece 14, install guide screw 15 on the installation plectane 18, be connected with connecting rod 17 between guide screw 15 and the linking piece 14, No. two support 8 are close to the bottom position and have been seted up passageway 19, braced frame 1 upper end bottom position has seted up spout 20, slider 16 combines together with spout 20, can be convenient for remove about the hopper 6, go out hopper 6 and link up with the cabinet, convenient operation, it sets up buffer stop 21 to go out hopper 6 right-hand member bilateral symmetry, can prevent out hopper 6 landing braced frame 1 and can reduce the friction between hopper 6 and the braced frame 1, better guard action has.

The working principle of the extruder is as follows: firstly, the stirred raw material is placed in an extruder barrel through a material inlet 3, wherein the material inlet 3 is communicated with the extruder barrel, a driving motor 5 is started to rotate, a chain 13 is matched to drive an extrusion screw 11 to rotate, the extrusion screw 11 penetrates through a first bracket 7, a second bracket 8 and a bearing sleeve 10, balls arranged in the bearing sleeve 10 can enable the rotation performance of the extrusion screw 11 to be better, the energy consumption and the loss of the extrusion screw 11 are reduced, a rotary pressing sheet 12 circularly extrudes the raw material in the extruder barrel, components in the raw material can be uniformly mixed with each other, the raw material continuously moves rightwards along with the rotation of the rotary pressing sheet 12, a blank is extruded through the material guide screw 15, wherein a connecting rod 17 is connected between the material guide screw 15 and a connecting block 14, the material guide screw 15 can be more stable in rotation, and then slides on a sliding chute 20 through a sliding block 16, drive out hopper 6 and discharge the blank, wherein slider 16 combines together with spout 20, can be convenient for go out the removal of hopper 6 and control, go out hopper 6 and link up with the cabinet, convenient operation, simultaneously go out the buffer stop 21 that hopper 6 right-hand member both sides were equipped with and braced frame 1 pillar gomphosis, can prevent out hopper 6 landing braced frame 1 and can reduce the friction between hopper 6 and braced frame 1, have better guard action.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.

Claims

1. A production process of a high-strength injection molding pipe fitting is characterized by comprising the following steps:

and (3) fixed-length cutting: cutting the molded injection molding pipe fitting at a fixed length to obtain injection molding pipe fittings of different specifications;

the modified polyvinyl chloride resin in the material mixing step is prepared from the following raw materials in parts by weight: 4-6 parts of nano calcium carbonate, 60-72 parts of chlorinated polyvinyl chloride resin powder and 5-7 parts of polyvinyl chloride resin;

in the batching step, a phosphite ester stabilizing system is adopted as the heat stabilizer, antimony trioxide is adopted as the flame retardant, an acrylate modifier is adopted as the processing modifier, and one of metal soap or stearic acid is adopted as the lubricant;

in the stirring step, the rotating speed of the high-speed stirrer is controlled at 450r/min, and the rotating speed of the cooling mixer is controlled at 120 r/min;

in the vacuum shaping step, the temperature of the forming machine is changed twice, firstly, the temperature is increased to 150 ℃ at a constant speed of 15 ℃/min, then the temperature is increased to 240 ℃ at a constant speed of 5 ℃/min, and secondly, the temperature is decreased to 30-50 ℃ at a constant speed of 25 ℃/min;

when the extruder is used in the blank extrusion step, firstly, the stirred raw materials are placed in an extruder barrel through a material inlet, wherein the material inlet is communicated with the extruder barrel, a driving motor is started to rotate, a chain is matched to drive an extrusion screw to rotate, the extrusion screw penetrates through a first bracket, a second bracket and a bearing sleeve, balls arranged in the bearing sleeve drive the extrusion screw to rotate, a rotary pressing sheet circularly extrudes the raw materials in the extruder barrel, components in the raw materials are uniformly mixed, the raw materials continuously move rightwards along with the rotation of the rotary pressing sheet, the blanks are extruded through the matching of a material guide screw, a connecting rod is connected between the material guide screw and a connecting block, the material guide screw is more stable in rotation, then the material discharge hopper is driven to discharge the blanks through sliding of a sliding block on the sliding chute, the sliding block is combined with the sliding chute, the discharge hopper can move leftwards and rightwards to be connected with a, the extruded blank can enter the storage cabinet through the discharge hopper;

the extruder in the extruded blank comprises a supporting frame (1), an outer frame (2) is installed at the upper end of the supporting frame (1), a feeding port (3) is formed in the position, close to the left end, of the outer frame (2), a machine barrel is arranged in the outer frame (2) and is communicated with the feeding port (3), a chain protective cover (4) is installed on one side face of the outer frame (2), a driving motor (5) is installed on one side of the bottom end of the chain protective cover (4), a discharge hopper (6) is installed on the supporting frame (1), the discharge hopper (6) is located at the bottom position of the right side of the outer frame (2), a first support (7) and a second support (8) are installed on two sides of the upper end of the supporting frame (1) in parallel, a bearing plate (9) is arranged at the parallel position of one side, away from the first support (7), a bearing sleeve (10), the rotating performance of the extrusion screw (11) can be improved, the energy consumption and the loss of the extrusion screw (11) are reduced, the extrusion screw (11) is connected with the first bracket (7), the second bracket (8) and the bearing sleeve (10) in a penetrating mode, a rotary pressing sheet (12) is arranged on the extrusion screw (11), the rotary pressing sheet (12) can extrude raw materials in an extruder barrel in a circulating mode, components in the raw materials can be uniformly mixed, a chain (13) is sleeved on the left end of the extrusion screw (11), and a sliding block (16) is installed on the supporting frame (1) in a crossing mode;

no. two support (8) side intermediate position are installed and are linked up piece (14), it is provided with installation plectane (18) all around to link up piece (14), install guide screw rod (15) on installation plectane (18), be connected with connecting rod (17) between guide screw rod (15) and linking up piece (14), No. two support (8) are close to the bottom position and have been seted up passageway (19), braced frame (1) upper end bottom position has seted up spout (20), slider (16) and spout (20) combine together, can be convenient for remove about play hopper (6), it links up with the cabinet to go out hopper (6), convenient operation, it sets up buffer stop (21) to go out hopper (6) right-hand member bilateral symmetry, can prevent out hopper (6) landing braced frame (1) and can reduce the friction between hopper (6) and braced frame (1), better guard action has.