A coextrusion die for PE pipe production

Abstract

The present invention provides a coextrusion die for the production of PE pipes, belonging to the technical field of coextrusion dies. It includes an installation connecting piece, and a core die part is installed on the installation connecting piece; the core die part is used for raw material circulation; a coextrusion adjusting piece is installed on the core die part; the coextrusion adjusting piece is used for adjusting the coextrusion forming width; a drool control piece is installed on the coextrusion adjusting piece; the drool control piece is used for externally expanding and separating drool; a cleaning piece is installed on the coextrusion adjusting piece; the cleaning piece is used for fitting the drool control piece. By setting a material shortage control piece, the present invention can perform real-time pressure detection on the extruded material outside the core die main body, and the local pressure boosting method can ensure the uniformity of flow pressure and automatic control compensation; to solve the problems that the existing coextrusion die for the production of PE pipes is not convenient for automatically controlling the compensation pressure and not convenient for assisting workers to clean without stopping the machine.

Description

Technical Field

[0001] The present invention relates to the technical field of co-extrusion dies, and particularly to a co-extrusion die for the production of PE pipes. Background Art

[0002] A co-extrusion die is a device used in plastic processing. It enables two or more materials to flow along their respective independent channels, converge near the outlet, and be co-extruded to form a multi-layered structure product. When producing PE pipes, a co-extrusion die is usually used for wire processing.

[0003] Currently, the co-extrusion dies for PE pipe production mainly use fixed co-extrusion material outlets, which are difficult to adjust the co-extrusion forming width and require cumbersome die replacement. At the same time, during the actual raw material extrusion process, due to factors such as raw material quality and the blockage of the flow divider, the flow pressure in different regions of the raw material is likely to be insufficient, making it inconvenient to automatically control the compensation pressure, affecting the uniformity of the pipe forming density. Also, when extruding pipes, over time, drool will accumulate at the die outlet, affecting the surface quality of the pipes. Since the drool will stick closely to the extruded pipes, manual cleaning is extremely likely to touch and damage the newly formed pipes, making it inconvenient for auxiliary workers to clean without stopping the machine. Therefore, this application provides a co-extrusion die for PE pipe production to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a co-extrusion die for PE pipe production to solve the problems that the existing co-extrusion die for PE pipe production is inconvenient for automatically controlling the compensation pressure, affects the uniformity of the pipe forming density, and is inconvenient for auxiliary workers to clean without stopping the machine.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A co-extrusion die for PE pipe production includes an installation connection member, on which a core die part is installed; the core die part is used for raw material circulation; a co-extrusion adjustment member is installed on the core die part; the co-extrusion adjustment member is used for adjusting the co-extrusion forming width; a drool control member is installed on the co-extrusion adjustment member; the drool control member is used for expanding and separating drool; a cleaning member is installed on the co-extrusion adjustment member; the cleaning member is used for fitting with the drool control member; a circle of flow distribution control members is installed on the core die part, and the circle of flow distribution control members is used for regulating the local flow pressure; a circle of material shortage control members is installed on the core die part; the installation connection member includes: a die body and a spiral adjustment ring, the die body is provided with threads; a threaded hole is provided in the middle of the die body; a spiral adjustment ring is threadedly connected in the threaded hole of the die body; the die body is used for installation on the barrel flange.

[0007] Optionally, the installation connecting piece further includes a retaining cover fixedly installed on the spiral adjusting ring; there is a gap between the retaining cover and the spiral adjusting ring; the retaining cover is used to close the threaded hole on the die body.

[0008] Optionally, the core die part includes a core die flange fixedly installed on the die body by bolts; a circle of flow dividing strips is fixedly installed inside the core die flange, and the intervals of the circle of flow dividing strips are the same; a core die main body is fixedly installed inside the circle of flow dividing strips; both sides of the core die main body are bevel structures; a circle of threaded holes is provided on the core die flange; there is a gap between the inner side of the core die flange and the core die main body; there is a gap between the die body and the core die main body.

[0009] Optionally, the co-extrusion adjusting piece includes an outer die fixedly installed on the core die flange by bolts; there is a gap between the outer die and the core die main body; the front end of the outer die is flush with the end of the core die main body; co-extrusion holes are provided on the outer die; threads are provided above the co-extrusion holes; the co-extrusion holes are used to externally connect the extrusion injection pipe; two width adjusting plates are slidably installed on the outer die, and the two width adjusting plates are respectively inserted into the co-extrusion holes; scale lines are respectively provided on the two co-extrusion holes; two width adjusting bolts are threadedly connected to the outer die; the end parts of the two width adjusting bolts respectively press and fit on the two width adjusting plates.

[0010] Optionally, the drooling control piece includes a circle of outward expanding sliding strips slidably inserted at the front end of the outer die; a circle of inward attracting electromagnets are fixedly installed at the tails of the circle of outward expanding sliding strips, and the inward attracting electromagnets are magnetically attracted to the inner side of the outer die; a tension spring is connected between the outward expanding sliding strips and the inner side of the outer die; a circle of baffles are fixedly installed at the ends of the circle of outward expanding sliding strips, and the ends of the circle of baffles are respectively of blade edge structures.

[0011] Optionally, the outward expanding sliding strips are obliquely installed; the circle of baffles are mutually attached, and the ends of the circle of baffles are attached to the front edge of the front end of the outer die.

[0012] Optionally, the cleaning piece includes a cleaning cover rotatably sleeved at the end of the outer die; a rubber ring is provided inside the cleaning cover, and the rubber ring inside the cleaning cover is attached to the baffle; a circle of cleaning bristles are fixedly installed on the cleaning cover, and the cleaning bristles are attached to the outer side of the baffle; the cleaning bristles are used to brush the drooling matter.

[0013] Optionally, the flow dividing control piece includes a flow dividing sliding shaft slidably inserted on the core die main body, and a flow dividing sliding block is fixedly installed at the end of the flow dividing sliding shaft, and the flow dividing sliding block is slidably installed on the core die main body; the top of the flow dividing sliding block is of an arc structure; the circle of flow dividing sliding blocks are located between the circle of flow dividing strips; the cross section of the flow dividing sliding shaft is of a T-shaped structure; the top of the flow dividing sliding block is of an arc-shaped convex structure.

[0014] Optionally, the shunt control member further includes a pull-back electromagnet fixedly installed on the mandrel body; the pull-back electromagnet is located below the shunt sliding shaft; there is a gap between the shunt sliding shaft and the pull-back electromagnet; a holding electromagnet is fixedly installed inside the mandrel body; the holding electromagnet magnetically adheres to the shunt sliding shaft.

[0015] Optionally, the material shortage regulating member includes a circle of detection pressure blocks slidably installed on the mandrel body, and a circle of detection pressure blocks are respectively aligned with a circle of shunt bars; a microswitch is fixedly installed inside each of the circle of detection pressure blocks, and a circle of microswitches are respectively electrically connected to the adjacent pull-back electromagnet and the holding electromagnet; a compression spring is fixedly installed inside each of the circle of detection pressure blocks, and the end parts of a circle of compression springs are respectively connected to the inside of the mandrel body.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above solution, by setting the installation connecting piece, it is convenient to close the pipeline when the mandrel part needs to be replaced subsequently, which can avoid the leakage caused by the fully open pipeline and the problem of raw material consolidation in the screw hole in the middle of the mold body. At the same time, this structure uses the co-extrusion adjusting piece to facilitate improving the co-extrusion molding effect. The width adjusting plate can be used to adjust the width of the co-extruded material, which can improve the flexibility of this structure in actual co-extrusion work. The adjustment method is simple and fast, and the staff can quickly adjust. At the same time, by adjusting the width of the co-extruded material, the flow rate, temperature and flow velocity of each layer of melt can be more precisely controlled.

[0018] By setting the cleaning member, it can cooperate with the drool control member to automatically clean the drool generated by the outer mold during the extrusion of the pipe, improving the pipe molding quality. At the same time, this structure adopts the drool control member to achieve cleaning without stopping the machine. It can expand obliquely outwards, attach the drool to the surface of the drool control member, which is convenient for cleaning. At the same time, when the baffle is gathered and merged, by using the way of opening the edge at its end, it fits on the edge of the outer mold, does not affect the end of the outer mold and the mandrel body to be flush, ensures that the frictional resistance of the inner and outer walls is the same when the pipe is discharged, and ensures the molding quality of this structure. At the same time, when the adopted drool control member expands, it does not affect the real-time discharge of the material, ensuring the manufacturing efficiency.

[0019] By setting the material shortage regulating member, it can perform real-time pressure detection on the extrusion material outside the mandrel body, avoiding local pressure deficiency. At the same time, it also prevents the pressure of the material from being easily reduced after passing through the shunt bar due to the block of the shunt bar, resulting in the problem of uneven material flow pressure. Due to the local inconsistency of the raw material flow pressure between the inner and outer molds, it may lead to uneven wall thickness of the pipe. Cooperating with the shunt control member can achieve automatic control of local pressure increase, realize the regulation work, and improve the molding quality during the actual use of this structure. At the same time, the way of local pressure increase can ensure the uniformity of flow pressure and automatic control compensation, without manual adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention, and together with the specification are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0021] Figure 1 It is a schematic three-dimensional structure diagram of a co-extrusion die for PE pipe production;

[0022] Figure 2 It is a cross-sectional view of the internal structure of a co-extrusion die for PE pipe production;

[0023] Figure 3 It is a schematic diagram of the installation position of the drool control part;

[0024] Figure 4 It is a schematic three-dimensional structure diagram of the installation connecting part;

[0025] Figure 5 It is a schematic enlarged three-dimensional structure diagram of the core die part;

[0026] Figure 6 It is a schematic enlarged sectional structure diagram of the co-extrusion adjusting part;

[0027] Figure 7 For Figure 2 The enlarged view of the structure of area D in;

[0028] Figure 8 It is a schematic diagram of the installation position of the baffle;

[0029] Figure 9 For Figure 2 The enlarged view of the structure of area B in;

[0030] Figure 10 For Figure 3 The enlarged view of the structure of area G in.

[0031] Reference numerals:

[0032] 1. Installation connecting part; 101. Die body; 102. Spiral adjusting ring; 103. Cover; 2. Core die part; 201. Core die flange; 2011. Dividing strip; 202. Core die main body; 3. Co-extrusion adjusting part; 301. Outer die; 3011. Co-extrusion hole; 302. Width adjusting plate; 303. Width adjusting bolt; 4. Drool control part; 401. Outer expanding slide bar; 402. Inner retracting electromagnet; 403. Baffle; 5. Cleaning part; 501. Cleaning cover; 5011. Cleaning brush bristles; 6. Dividing flow control part; 601. Dividing flow slide shaft; 602. Dividing flow slide block; 603. Pull-back electromagnet; 604. Holding electromagnet; 7. Material shortage control part; 701. Detection pressing block; 702. Microswitch; 703. Compression spring.

[0033] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device, and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0034] The following will describe in detail a co-extrusion die for PE pipe production provided by the present invention with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0035] It should be noted that in the specification, when referring to "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc., it indicates that the described embodiment may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining an embodiment to describe a specific feature, structure, or characteristic, implementing such a feature, structure, or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0036] Generally, terms can be understood at least in part from their use in the context. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but instead, at least in part depending on the context, allowing for the existence of other factors that may not be explicitly described.

[0037] It can be understood that the meanings of "on...", "above...", and "over..." in the present invention should be interpreted in the broadest manner, such that "on..." not only means "directly on" something, but also includes the meaning of being "on" something with intermediate features or layers therebetween, and "above..." or "over..." not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intermediate features or layers therebetween.

[0038] In addition, spatial relative terms such as "under", "below", "lower part", "above", "upper part", etc. may be used in this text for convenience of description to describe the relationship between one element or feature and another or more elements or features, as shown in the drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device other than the orientation depicted in the drawings. The device may be oriented in other ways, and the spatial relative descriptors used in this text may be similarly interpreted accordingly.

[0039] As Figures 1 to 10 shown, an embodiment of the present invention provides a co-extrusion die for PE pipe production, including a mounting connection member 1, on which a core die part 2 is mounted; the core die part 2 is used for raw material circulation; a co-extrusion adjustment member 3 is mounted on the core die part 2; the co-extrusion adjustment member 3 is used for adjusting the co-extrusion forming width; a drooling control member 4 is mounted on the co-extrusion adjustment member 3; the drooling control member 4 is used for expanding and separating drool; a cleaning member 5 is mounted on the co-extrusion adjustment member 3; the cleaning member 5 is used for fitting to the drooling control member 4; a circle of flow distribution control members 6 is mounted on the core die part 2, and the circle of flow distribution control members 6 is used for regulating the local flow pressure; a circle of material shortage regulating members 7 is mounted on the core die part 2; the mounting connection member 1 includes: a die body 101 and a spiral adjustment ring 102, the die body 101 is provided with threads; a threaded hole is provided in the middle of the die body 101; the spiral adjustment ring 102 is threadedly connected to the threaded hole in the die body 101; the die body 101 is used for mounting on the barrel flange.

[0040] As Figures 3 to 6As shown, the mounting connection member 1 further includes a retaining cover 103 fixedly mounted on the spiral adjustment ring 102; there is a gap between the retaining cover 103 and the spiral adjustment ring 102; the retaining cover 103 is used to close the threaded hole on the die body 101; the core mold part 2 includes a core mold flange 201 fixedly mounted on the die body 101 by bolts; a circle of flow dividing strips 2011 is fixedly mounted inside the core mold flange 201, and the intervals of the circle of flow dividing strips 2011 are the same; a core mold body 202 is fixedly mounted inside the circle of flow dividing strips 2011; both sides of the core mold body 202 are bevel structures; a circle of threaded holes is provided on the core mold flange 201; there is a gap between the inner side of the core mold flange 201 and the core mold body 202; there is a gap between the die body 101 and the core mold body 202; the co-extrusion adjustment member 3 includes an outer die 301 fixedly mounted on the core mold flange 201 by bolts; there is a gap between the outer die 301 and the core mold body 202; the front end of the outer die 301 is flush with the end of the core mold body 202; the outer die 301 is provided with co-extrusion holes 3011; there is a thread above the co-extrusion holes 3011; the co-extrusion holes 3011 are used to connect to an extruded plastic injection pipe; two width adjustment plates 302 are slidably mounted on the outer die 301, and the two width adjustment plates 302 are respectively inserted into the co-extrusion holes 3011; scale lines are respectively provided on the two co-extrusion holes 3011; two width adjustment bolts 303 are threadedly connected to the outer die 301; the end parts of the two width adjustment bolts 303 respectively press and fit on the two width adjustment plates 302. The use of the mounting connection member 1 can facilitate the closing of the pipeline when the core mold part 2 needs to be replaced subsequently, avoid leakage caused by a fully open pipeline and the problem of raw material consolidation in the middle threaded hole of the die body 101. At the same time, this structure uses the co-extrusion adjustment member 3 to facilitate the improvement of the co-extrusion molding effect. The width adjustment plate 302 can be used to adjust the width of the co-extruded material, which can improve the flexibility of this structure in actual co-extrusion work. The adjustment method is simple and fast, and the staff can quickly adjust. At the same time, by adjusting the width of the co-extruded material, the flow rate, temperature and flow velocity of each layer of melt can be more precisely controlled, ensuring the stability of the interlayer interface and improving the interlayer composite adhesion force, which helps to produce composite material products with excellent properties, such as high barrier properties, high strength, high elasticity, etc. When the core mold flange 201 is removed, the spiral adjustment ring 102 can be driven to retract by using a screwdriver to butt against the retaining cover 103, and the middle part of the die body 101 can be closed by the retaining cover 103.

[0041] As Figures 4 to 8As shown, the drooling control member 4 includes an outwardly expanding slide bar 401 that is slidably inserted around the front end of the outer mold 301; inwardly attracting electromagnets 402 are fixedly installed at the tails of the outwardly expanding slide bars 401 respectively, and the inwardly attracting electromagnets 402 are magnetically attracted to the inner side of the outer mold 301; a tension spring is connected between the outwardly expanding slide bar 401 and the inner side of the outer mold 301; baffles 403 are fixedly installed at the ends of the outwardly expanding slide bars 401 respectively, and the ends of the baffles 403 are respectively of a blade edge structure; the outwardly expanding slide bar 401 is obliquely installed; the baffles 403 are in contact with each other, and the ends of the baffles 403 are attached to the front edge of the outer mold 301; the cleaning member 5 includes a cleaning cover 501 that is rotatably sleeved on the end of the outer mold 301; a rubber ring is provided inside the cleaning cover 501, and the rubber ring inside the cleaning cover 501 is attached to the baffle 403; a circle of cleaning bristles 5011 is fixedly installed on the cleaning cover 501, and the cleaning bristles 5011 are attached to the outer side of the baffle 403; the cleaning bristles 5011 are used to brush the drooling material. By using the cleaning member 5, it can cooperate with the drooling control member 4 to automatically clean the drooling material generated when the outer mold 301 extrudes the pipe, improving the pipe forming quality. At the same time, with this structure, the drooling control member 4 can achieve cleaning without stopping the machine, can expand obliquely outwards, attach the drooling material to the surface of the drooling control member 4 for easy cleaning. At the same time, when the baffles 403 gather and merge, by using the way of opening the blade at their ends, they are attached to the edge of the outer mold 301 without affecting the alignment of the ends of the outer mold 301 and the core mold body 202, ensuring that the frictional resistance of the inner and outer walls is the same when the pipe is discharged, guaranteeing the forming quality of this structure. At the same time, when the drooling control member 4 used expands, it does not affect the real-time discharge of the material, ensuring the manufacturing efficiency. The drooling material will form defects on the surface of the extruded pipe, such as protrusions, depressions or unevenness, affecting the appearance quality of the product. As the pipe is discharged in real time, when the drooling material adheres to the edge of the baffle 403 and needs to be cleaned, control the inwardly attracting electromagnet 402 to cut off the power, no longer magnetically attracting the inner side of the outer mold 301, and cooperate with the tension spring between the outer mold 301 and the outwardly expanding slide bar 401, the outwardly expanding slide bar 401 can drive the baffle 403 to expand outwards. At this time, the inner edge diameter of the baffles 403 is larger than the extruded pipe, without affecting the real-time transportation of the pipe.

[0042] As Figures 4 to 10As shown, the flow control member 6 includes a flow dividing slide shaft 601 slidably inserted on the mandrel body 202, and a flow dividing slider 602 is fixedly installed at the end of the flow dividing slide shaft 601. The flow dividing slider 602 is slidably installed on the mandrel body 202; the top of the flow dividing slider 602 is an arc-shaped structure; a circle of flow dividing sliders 602 is located between a circle of flow dividing bars 2011; the cross-section of the flow dividing slide shaft 601 is a T-shaped structure; the top of the flow dividing slider 602 is an arc-shaped convex structure; the flow control member 6 further includes a pull-back electromagnet 603 fixedly installed on the mandrel body 202; the pull-back electromagnet 603 is located below the flow dividing slide shaft 601; there is a gap between the flow dividing slide shaft 601 and the pull-back electromagnet 603; a holding electromagnet 604 is fixedly installed inside the mandrel body 202; the holding electromagnet 604 magnetically adheres to the flow dividing slide shaft 601; the material shortage regulating member 7 includes a circle of detection pressure blocks 701 slidably installed on the mandrel body 202, and a circle of detection pressure blocks 701 are respectively aligned with a circle of flow dividing bars 2011; a micro switch 702 is fixedly installed inside each of the circle of detection pressure blocks 701, and a circle of micro switches 702 are respectively electrically connected to the adjacent pull-back electromagnet 603 and holding electromagnet 604; a compression spring 703 is fixedly installed inside each of the circle of detection pressure blocks 701, and the ends of a circle of compression springs 703 are respectively connected to the inside of the mandrel body 202. The material shortage regulating member 7 can be used to perform real-time pressure detection on the extruded material outside the mandrel body 202, avoiding local pressure deficiency, and at the same time preventing the pressure of the material from being easily reduced after passing through the flow dividing bar 2011 due to the blockage of the flow dividing bar 2011, resulting in the problem of uneven material flow pressure. Due to the local inconsistency of the raw material flow pressure between the inner and outer molds, it may cause uneven wall thickness of the pipe. This uneven wall thickness not only affects the appearance quality of the pipe, but may also reduce its mechanical properties and service life. The uneven wall thickness will naturally cause the pipe to bend after cooling, and the inconsistent flow pressure may also cause defects such as bubbles and voids inside the pipe. This structure can cooperate with the flow control member 6 to achieve automatic control of local pressure increase, and can cooperate with the material shortage regulating member 7 to achieve the regulation work, improving the forming quality during the actual use of this structure. At the same time, the method of local pressure increase can ensure the uniformity of flow pressure, automatic control compensation, without manual adjustment, avoiding the problem that it is difficult for manual to observe and detect the material between the outer mold 301 and the mandrel body 202 in the traditional way. When there is a flow pressure deficiency area, the pull-back electromagnet 603 can be controlled to be energized and the holding electromagnet 604 can be powered off. At this time, the flow dividing slider 602 can move downward and retract. At this time, the flow area here increases, which can increase the local flow pressure and improve the flow pressure uniformity to improve the subsequent pipe forming quality.

[0043] The working principle provided by the present invention is that first, the mold body 101 is threadedly connected to the barrel flange, and then the extruder barrel can discharge the material, passing between the outer mold 301 and the core mold body 202 to perform the molding work. When the outer mold 301 and the core mold body 202 need to be replaced later, when the core mold flange 201 is removed, the baffle 103 can be connected by a screwdriver to drive the spiral adjustment ring 102 to retreat, and the middle part of the mold body 101 is closed by the baffle 103. At the same time, when the actual supply line width needs to be adjusted, the two width adjustment plates 302 are slid and adjusted. After the spacing between the two width adjustment plates 302 is adjusted, the width adjustment bolts 303 are tightened respectively, and the raw material extruded in the co-extrusion hole 3011 can be co-extruded with the material extruded from the outside of the core mold body 202. As the pipe is discharged in real time, when the saliva adheres to the edge of the baffle 403, the inward electromagnet 402 is controlled to be powered off when cleaning is required, and it no longer magnetically attracts the inner side of the outer mold 301, and cooperates The tension spring between the outer mold 301 and the outward expansion slide 401, the outward expansion slide 401 can drive the baffle 403 to expand outward, and then cooperate with the rotating cleaning cover 501 to drive the cleaning bristles 5011 to brush the attachments on the cutting edge of the cleaning baffle 403; when the raw material passes through the outside of the core mold body 202, the fluid pressure will press down the detection pressure block 701, compress the compression spring 703, and press the micro switch 702. If the flow pressure decreases locally and is uneven, the local pressure is too small. At this time, under the pressure of the compression spring 703, the detection pressure block 701 can expand outward, and the micro switch 702 is no longer squeezed. At this time, the micro switch 702 can control the adjacent pullback electromagnet 603 to be energized and keep the electromagnet 604 de-energized. At this time, the diverter slider 602 can move down and retract, and the distance between the outside of the diverter slider 602 and the inside of the core mold flange 201 increases. At this time, the flow area here increases, which can increase the local flow pressure and improve the uniformity of the flow pressure.

[0044] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A co-extrusion die for the production of PE pipes, comprising a mounting connector, and a mandrel part is mounted on the mounting connector; characterized in that, The mandrel part is used for raw material circulation; a co-extrusion adjusting part is installed on the mandrel part; the co-extrusion adjusting part is used for adjusting the co-extrusion molding width; A drooling control part is installed on the co-extrusion adjusting part; The drooling control part is used for outwardly expanding and separating the drool; a cleaning part is installed on the co-extrusion adjusting part; the cleaning part is used for fitting the drooling control part; A circle of flow distribution control parts is installed on the mandrel part, and the circle of flow distribution control parts is used for regulating the local flow pressure; a circle of material shortage regulating parts is installed on the mandrel part; The installation connecting part includes: a die body and a spiral adjusting ring, the die body is provided with threads; a threaded hole is provided in the middle of the die body; a spiral adjusting ring is threadedly connected in the threaded hole of the die body; the die body is used for installing on the barrel flange; The mandrel part includes a mandrel flange fixedly installed on the die body by bolts; a circle of flow distribution strips is fixedly installed inside the mandrel flange, and the intervals of the circle of flow distribution strips are the same; a mandrel main body is fixedly installed inside the circle of flow distribution strips; both sides of the mandrel main body are inclined plane structures; a circle of threaded holes is provided on the mandrel flange; there is an interval between the inner side of the mandrel flange and the mandrel main body; there is an interval between the die body and the mandrel main body; The co-extrusion adjusting part includes an outer die fixedly installed on the mandrel flange by bolts; there is an interval between the outer die and the mandrel main body; the front end of the outer die is flush with the end of the mandrel main body; co-extrusion holes are provided on the outer die; threads are provided above the co-extrusion holes; the co-extrusion holes are used for externally connecting extrusion injection pipes; two width-adjusting plates are slidably installed on the outer die, and the two width-adjusting plates are respectively inserted into the co-extrusion holes; scale lines are respectively provided on the two co-extrusion holes; two width-adjusting bolts are threadedly connected to the outer die; the end parts of the two width-adjusting bolts respectively press and fit on the two width-adjusting plates.

2. The co-extrusion die for PE pipe production according to claim 1, characterized in that, The installation connecting part further includes a retaining cover fixedly installed on the spiral adjusting ring; there is an interval between the retaining cover and the spiral adjusting ring; the retaining cover is used for closing the threaded hole on the die body.

3. The co-extrusion die for PE pipe production according to claim 1, characterized in that, The drooling control part includes a circle of outwardly expanding sliding strips slidably inserted at the front end of the outer die; a circle of inner retracting electromagnets are fixedly installed at the tails of the circle of outwardly expanding sliding strips, and the inner retracting electromagnets are magnetically attracted to the inner side of the outer die; a tension spring is connected between the outwardly expanding sliding strips and the inner side of the outer die; a circle of baffles are fixedly installed at the end parts of the circle of outwardly expanding sliding strips, and the end parts of the circle of baffles are respectively of edge structure.

4. The co-extrusion die for PE pipe production according to claim 3, characterized in that, The outwardly expanding sliding strips are obliquely installed; the circle of baffles are mutually attached, and the end parts of the circle of baffles are attached to the front edge of the outer die.

5. The co-extrusion die for PE pipe production according to claim 4, characterized in that, The cleaning part includes a cleaning cover rotatably sleeved at the end of the outer die; a rubber ring is provided inside the cleaning cover, and the rubber ring inside the cleaning cover is attached to the baffle; a circle of cleaning bristles are fixedly installed on the cleaning cover, and the cleaning bristles are attached to the outside of the baffle; the cleaning bristles are used for brushing the drool.

6. The coextrusion die for PE pipe production according to claim 1, characterized in that, The flow distribution control part includes a flow distribution sliding shaft slidably inserted on the mandrel main body, and a flow distribution sliding block is fixedly installed at the end of the flow distribution sliding shaft, and the flow distribution sliding block is slidably installed on the mandrel main body; the top of the flow distribution sliding block is an arc structure; the circle of flow distribution sliding blocks are located between the circle of flow distribution strips; the cross section of the flow distribution sliding shaft is a T-shaped structure; the top of the flow distribution sliding block is an arc convex structure.

7. The coextrusion die for PE pipe production according to claim 6, characterized in that, The flow control member further includes a pull-back electromagnet fixedly installed on the mandrel body; the pull-back electromagnet is located below the flow-dividing sliding shaft; there is a gap between the flow-dividing sliding shaft and the pull-back electromagnet; a holding electromagnet is fixedly installed inside the mandrel body; the holding electromagnet magnetically adheres to the flow-dividing sliding shaft.

8. The co-extrusion die for PE pipe production according to claim 7, characterized in that, The material shortage control member includes a circle of detection pressure blocks slidably installed on the mandrel body, and a circle of detection pressure blocks are respectively aligned with a circle of flow-dividing bars; a microswitch is fixedly installed inside each of the circle of detection pressure blocks, and each of the circle of microswitches is electrically connected to the adjacent pull-back electromagnet and holding electromagnet; a compression spring is fixedly installed inside each of the circle of detection pressure blocks, and the end parts of the circle of compression springs are respectively connected to the inside of the mandrel body.

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