Extrusion equipment for producing heat-resistant polyethylene pipe

Abstract

The invention discloses extrusion equipment for producing a heat-resistant polyethylene pipe, and belongs to the technical field of pipe extrusion processing. Comprising an extruder body, a feeding assembly is arranged above the extruder body, a material pressing assembly is arranged between the feeding assembly and the extruder body and comprises a material pressing cover plate, two material pressing units are symmetrically arranged on the two sides of the material pressing cover plate, and each material pressing unit comprises a mounting cover; a driving guide rail is fixedly mounted on the inner wall of the mounting cover, a connecting piece is slidably mounted on the inner wall of the driving guide rail, and a pressing plate is fixedly connected to the top of the connecting piece; the material pressing assembly is arranged above the extruder body, in the extrusion and feeding process, discharging pressing is conducted on materials, so that blocking and bridging of the materials in the discharging process are avoided, the uniformity of the discharging process is guaranteed, the uniformity of material melting and extrusion speed is improved, and the quality of extruded pipes is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe extrusion processing, in particular to an extrusion equipment for heat-resistant polyethylene pipe production. BACKGROUND

[0002] Heat-resistant polyethylene (PE-RT) pipe is widely used in high-temperature pressure systems such as floor heating and hot water transportation due to its excellent long-term heat creep resistance and impact strength. Its extrusion processing is the core link of pipe production, involving key technologies such as material plasticization, melt homogenization, and extrusion molding. Due to the characteristics of high density, low melt strength, and special crystal structure of PE-RT resin, the processing process has significantly higher requirements for temperature control, melt uniformity, and feeding stability than ordinary polyethylene (PE) pipe.

[0003] Heat-resistant polyethylene raw material particles are prone to "bridging" phenomenon (interlocking particles forming an arch-shaped blockage) during the extruder hopper feeding process due to their high density, low flowability, and electrostatic adsorption characteristics, which causes feeding interruption or fluctuation. This problem further leads to uneven melting: the discontinuous material input causes the screw to fluctuate in material consumption, and the melt temperature and pressure become unstable; which in turn causes production quality to decline and raw material waste. Therefore, it is necessary to improve. SUMMARY

[0004] The present application provides an extrusion equipment for heat-resistant polyethylene pipe production, which can solve the problem of uneven material input of the extruder in the prior art, leading to production quality decline and raw material waste.

[0005] The present application provides an extrusion equipment for heat-resistant polyethylene pipe production, which includes an extruder body, a feeding assembly is arranged above the extruder body, a pressing assembly is arranged between the feeding assembly and the extruder body, the pressing assembly includes a pressing cover plate, two pressing units are symmetrically arranged on both sides of the pressing cover plate, the pressing unit includes a mounting cover, a driving guide rail is fixedly installed on the inner wall of the mounting cover, a connecting piece is slidably installed on the inner wall of the driving guide rail, and a pressing plate is fixedly connected to the top of the connecting piece.

[0006] As a further scheme of the present application: the pressing plate includes a fixed segment and a movable segment, the fixed segment is horizontally arranged, a rotating shaft is fixedly connected to one side of the movable segment, the rotating shaft is rotatably connected to the fixed segment, a turnover motor is fixedly installed on the edge of the fixed segment close to the movable segment, and the output end of the turnover motor is fixedly connected to the rotating shaft.

[0007] As a further scheme of the present application: the connecting piece includes a connecting seat, a tension sensor is fixedly installed on the inner wall bottom of the connecting seat, a pull rod is fixedly connected to the output end of the tension sensor, a docking frame is fixedly connected to the top of the pull rod, and the top of the docking frame is fixedly connected to the bottom of the fixed segment.

[0008] As a further scheme of the present application: the length of the movable section is consistent with the height of the inner cavity of the mounting cover.

[0009] As a further scheme of the present application: the feeding assembly comprises a feeding hopper, a cover frame is fixedly installed on the top of the feeding hopper, a sliding groove is formed in the inner wall of the cover frame, and an upper cover plate is slidably connected to the inner wall of the sliding groove.

[0010] As a further scheme of the present application: a cover motor is fixedly installed on one side of the bottom of the cover frame, a cover gear is fixedly connected to the output end of the cover motor, a tooth groove is formed in the bottom of the upper cover plate, and the cover gear is meshingly connected with the tooth groove.

[0011] As a further scheme of the present application: the extruder body comprises a base, an extrusion guide pipe is fixedly installed on one side of the base, a spiral extrusion rod is arranged in the interior of the extrusion guide pipe, a driving motor is fixedly installed on the other side of the base, the output end of the driving motor is fixedly connected with one end of the spiral extrusion rod, and an extrusion die is fixedly installed on one end of the extrusion guide pipe.

[0012] As a further scheme of the present application: a material receiving plate is fixedly connected to the middle of the inner wall of the base, the material receiving plate is obliquely arranged on both sides, a material guide groove is concavely arranged in the middle of the material receiving plate downward, and one end of the material guide groove is correspondingly arranged with one end of the extrusion guide pipe.

[0013] As a further scheme of the present application: the extrusion die comprises a die sleeve and a die core, a die cavity is formed in the interior of the die sleeve, the die cavity comprises a contraction cavity and an output cavity, the output cavity is arranged as a circular cavity, the die core comprises an output section and a flow guide section, the output end is a cylindrical body and is arranged in the output cavity, and the flow guide section is a circular truncated cone and is arranged in the contraction cavity.

[0014] As a further scheme of the present application: a support frame is arranged in the middle of the extrusion guide pipe, a bearing sleeve ring is fixedly connected to the top of the support frame, and the bearing sleeve ring is slidably arranged with the outer wall of the extrusion guide pipe.

[0015] Compared with the prior art, the present application has the following beneficial effects: by arranging the material pressing assembly above the extruder body, the material is pressed during the extrusion feeding process, so as to avoid the blockage and bridging of the material during the discharging process, ensure the uniformity of the discharging process, improve the uniformity of the material melting and extrusion speed, and improve the quality of the extruded pipe; The material pressing assembly of this invention, by setting a connector, uses a tension sensor to detect the resistance encountered by the pressing plate during its downward movement. By comparing the resistance on both sides, it determines whether the material feeding is balanced, thus realizing the detection of the material movement state. Furthermore, by driving the pressing plates on both sides through two drive guide rails, it realizes the adjustment and control of the material feeding state. By ensuring that the length of the movable section is consistent with the height of the inner cavity of the mounting cover, it can stably cover the inner cavity of the mounting cover when the movable section is flipped vertically, thereby preventing material from entering the inner cavity of the mounting cover. The feeding assembly of the present invention, by providing a sliding top cover plate, seals the top of the feeding hopper to prevent material from escaping during extrusion. At the same time, when not in use, the feeding hopper is sealed to prevent external dust and debris from falling into the feeding hopper. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a side cross-sectional view of the present invention; Figure 3 This is a side cross-sectional view of the pressing assembly of the present invention. Figure 1 ; Figure 4 This is a side cross-sectional view of the pressing assembly of the present invention. Figure 2 ; Figure 5 This is a cross-sectional schematic diagram of the connector of the present invention; Figure 6 This is a cross-sectional schematic diagram of the extrusion die of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Extruder body; 101. Base; 102. Drive motor; 103. Spiral extrusion rod; 104. Feed hopper; 105. Cover frame; 106. Cover motor; 107. Top cover plate; 108. Extrusion guide pipe; 109. Receiving plate; 110. Extrusion die; 111. Die sleeve; 112. Die core; 2. Pressing assembly; 201. Pressing cover plate; 202. Mounting cover; 203. Drive guide rail; 204. Connector; 2041. Connecting seat; 2042. Tension sensor; 2043. Docking frame; 205. Fixed section; 206. Moving section; 207. Rotating shaft; 208. Tilting motor; 3. Supporting collar. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0019] like Figures 1 to 6 As shown in the figure, an extrusion device for producing heat-resistant polyethylene pipes is provided in an embodiment of the present invention. Please refer to [link to relevant documentation].Figure 1 , including the extruder body 1, the upper part of the extruder body 1 is provided with a feeding assembly, and the feeding assembly is provided with a pressing assembly 2 between the extruder body 1, please refer to Figure 1 and Figure 3 , the pressing assembly 2 includes a pressing cover plate 201, two pressing units are symmetrically arranged on both sides of the pressing cover plate 201, the pressing unit includes a mounting cover 202, the inner wall of the mounting cover 202 is fixedly installed with a driving guide rail 203, the inner wall of the driving guide rail 203 is slidably installed with a connecting piece 204, and the top of the connecting piece 204 is fixedly connected with a pressing plate, the present application is provided with the pressing assembly 2, which can press the material during the extrusion feeding process, so as to ensure the uniformity of the discharging process.

[0020] In order to avoid the obstruction of the pressing plate to the material falling, the pressing plate is segmented in the application, specifically, the pressing plate includes a fixed segment 205 and a movable segment 206 which can rotate relative to each other, the fixed segment 205 is horizontally arranged and fixedly connected with the connecting piece 204, one side of the movable segment 206 is fixedly connected with a rotating shaft 207, and the rotating shaft 207 is rotatably connected with the fixed segment 205. The movable segment 206 is rotatably arranged with the fixed segment 205, so that the movable segment 206 can naturally fall vertically under the action of gravity, so as to avoid the material falling from the feeding hopper 104, at this time, as shown in Figure 4 , specifically, the rotating shaft 207 is arranged at the lower part of the connecting part of the fixed segment 205 and the movable segment 206, because when the movable segment 206 is lifted and turned to be horizontal, it can be prevented from continuing to turn upward by the obstruction of the fixed segment 205, and enough pressure can be ensured when the movable segment 206 is pressed down; The edge of the fixed segment 205 close to the movable segment 206 is fixedly installed with a turnover motor 208, the output end of the turnover motor 208 is fixedly connected with the rotating shaft 207, the rotating shaft 207 is driven to rotate by the turnover motor 208, so as to adjust the posture of the movable segment 206, in this embodiment, the movable segment 206 has two position states of horizontal and vertical; the length of the movable segment 206 is consistent with the height of the inner cavity of the mounting cover 202, so that the inner cavity of the mounting cover 202 can be stably covered when the movable segment 206 is turned vertically, so as to avoid the material entering the inner cavity of the mounting cover 202.

[0021] In one embodiment, please refer to Figure 5In order to realize the detection of the material movement state, the connecting piece 204 comprises a connecting seat 2041, a tension sensor 2042 is fixedly installed at the inner wall bottom of the connecting seat 2041, a pull rod is fixedly connected to the output end of the tension sensor 2042, a docking frame 2043 is fixedly connected to the top of the pull rod, the top of the docking frame 2043 is fixedly connected with the bottom of the fixed section 205, the resistance size borne by the pressing plate during the downward movement is detected through the tension sensor 2042, and whether the material is evenly discharged is judged through the comparison of the resistance sizes on both sides.

[0022] In one embodiment, referring to Figure 1 , the feeding assembly comprises a feeding hopper 104, a cover frame 105 is fixedly installed at the top of the feeding hopper 104, a sliding groove is formed in the inner wall of the cover frame 105, and an upper cover plate 107 is slidably connected to the inner wall of the sliding groove. By setting the slidable upper cover plate 107, the top of the feeding hopper 104 is closed, so as to avoid the escape and discharge of the material during extrusion, and the feeding hopper 104 is closed when not in use, so as to prevent foreign matter from falling into the feeding hopper 104.

[0023] In one embodiment, in order to realize the automatic opening and closing operation of the upper cover plate 107, a cover motor 106 is fixedly installed at the bottom of one side of the cover frame 105, a cover gear is fixedly connected to the output end of the cover motor 106, a tooth groove is formed in the bottom of the upper cover plate 107, and the cover gear is meshedly connected with the tooth groove. The cover motor 106 drives the cover gear to rotate, and in turn drives the upper cover plate 107 to slide and displace.

[0024] In one embodiment, referring to Figure 2 , the specific structure of the extruder body 1 can be implemented by referring to the technical means of the existing heat-resistant polyethylene pipe extruder. A feasible structure scheme is provided in the application. The extruder body 1 comprises a base 101, an extrusion guide pipe 108 is fixedly installed at one side of the base 101, a spiral extrusion rod 103 is arranged in the inside of the extrusion guide pipe 108, a driving motor 102 is fixedly installed at the other side of the base 101, the output end of the driving motor 102 is fixedly connected with one end of the spiral extrusion rod 103, and an extrusion die 110 is fixedly installed at one end of the extrusion guide pipe 108. The spiral extrusion rod 103 can be selected from the conventional design of the existing heat-resistant polyethylene extrusion rod, such as increasing the main rib pitch, deepening the compression section screw groove to reduce shear heat, avoiding degradation caused by high-temperature superposition, reducing the gap of the barrier section auxiliary rib, shortening the barrier zone pitch to enhance the melt homogeneity, and improving the melt elasticity. It is a prior art and will not be described here.

[0025] In one embodiment, referring to Figure 4In order to facilitate the centralized conveying of the material, the inner wall of the base 101 is fixedly connected with a material receiving plate 109 in the middle part, the two sides of the material receiving plate 109 are inclinedly arranged, and the middle part of the material receiving plate 109 is concavely arranged with a material guide groove downward, and one end of the material guide groove is correspondingly arranged with one end of the extrusion material guide pipe 108.

[0026] In one embodiment, referring to Figure 2 and Figure 6 The extrusion die 110 comprises a die sleeve 111 and a die core 112, the inside of the die sleeve 111 is provided with a die cavity, the die cavity comprises a contraction cavity and an output cavity, the output cavity is a horizontally arranged circular cavity, the die core 112 comprises an output section and a flow guide section, the output end is a cylinder and is arranged in the output cavity, the flow guide section is a circular truncated cone and is arranged in the contraction cavity, by horizontally extending the output cavity and cooperating with the output section, the effective extrusion of the heat-resistant polyethylene is realized.

[0027] In one embodiment, in order to assist in supporting the extrusion material guide pipe 108, so as to improve the position stability of the extrusion material guide pipe 108, so that the gap between the spiral extrusion rod 103 and the inner wall of the extrusion material guide pipe 108 is balanced, and then the uniformity of the material output is ensured, the middle part of the extrusion material guide pipe 108 is provided with a support frame, the top of the support frame is fixedly connected with a supporting sleeve ring 3, and the supporting sleeve ring 3 is slidingly arranged with the outer wall of the extrusion material guide pipe 108.

[0028] In use, first, the polyethylene raw material is put into the feeding hopper 104 by the external feeding device, and is received by the material receiving plate 109, at this time, the state of the pressing unit please refer to Figure 4 , that is, the movable section 206 is lowered to avoid the material, and the inner cavity of the mounting cover 202 is shielded, when the material is finished, the cover motor 106 is started to drive the cover gear to rotate, and the upper cover plate 107 is moved to close the top of the feeding hopper 104; Then the movable section 206 is driven to rotate by the overturning motor 208, so that it is gradually lifted to the horizontal position, at this time, the state of the pressing unit please refer to Figure 3 , the connecting piece 204 and the pressing plate thereon are driven by the driving guide rail 203 to move downward as a whole, and the material is pressed to move downward; the material in the extruder body 1 is heated and melted by the built-in heating device, and the spiral extrusion rod 103 is driven to rotate by the driving motor 102, so as to push the molten material, and after passing through the extrusion die 110, the material is extruded and formed; In the process of driving the connector 204 and the pressure plate on it as a whole to move downward by the driving guide rail 203, the reaction force of the material on the pressure plate will drive the abutting frame 2043 and the pull rod to move, thereby causing the reading change of the tension sensor 2042. When the readings of the two tension sensors 2042 are basically consistent, it is judged that the material distribution is normal at this time. The pressure plate is continuously driven by the driving guide rails 203 at a uniform speed. When the reading error of the two tension sensors 2042 exceeds the preset value, it is judged that the material distribution on the side with smaller reading is sparse. Then the downward pressure speed of the driving guide rail 203 on the corresponding side is increased until the readings of the two tension sensors 2042 are basically consistent. In this way, the stable material supply of the extruder body 1 is ensured, the extrusion is uniform, and the finished product quality of the polyethylene pipe is improved.

[0029] The above disclosure is only a few specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any changes that can be thought of by those skilled in the art shall fall within the protection scope of the present application.

Claims

1. An extrusion equipment for producing heat-resistant polyethylene pipes, characterized in that, The extruder body (1) is provided with a feeding assembly above it. A pressing assembly (2) is provided between the feeding assembly and the extruder body (1). The pressing assembly (2) includes a pressing cover (201). Two pressing units are symmetrically arranged on both sides of the pressing cover (201). The pressing unit includes a mounting cover (202). A drive guide rail (203) is fixedly installed on the inner wall of the mounting cover (202). A connector (204) is slidably installed on the inner wall of the drive guide rail (203). A pressing plate is fixedly connected to the top of the connector (204).

2. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 1, characterized in that, The pressure plate includes a fixed section (205) and a movable section (206). The fixed section (205) is horizontally arranged. A rotating shaft (207) is fixedly connected to one side of the movable section (206). The rotating shaft (207) is rotatably connected to the fixed section (205). A flip motor (208) is fixedly installed on the edge of the fixed section (205) near the movable section (206). The output end of the flip motor (208) is fixedly connected to the rotating shaft (207).

3. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 2, characterized in that, The connector (204) includes a connector (2041), a tension sensor (2042) is fixedly installed on the bottom of the inner wall of the connector (2041), a pull rod is fixedly connected to the output end of the tension sensor (2042), a docking frame (2043) is fixedly connected to the top of the pull rod, and the top of the docking frame (2043) is fixedly connected to the bottom of the fixed section (205).

4. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 2, characterized in that, The length of the movable segment (206) is consistent with the height of the inner cavity of the mounting cover (202).

5. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 1, characterized in that, The feeding assembly includes a feeding hopper (104), and a cover frame (105) is fixedly installed on the top of the feeding hopper (104). A sliding groove is provided on the inner wall of the cover frame (105), and an upper cover plate (107) is slidably connected to the inner wall of the sliding groove.

6. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 5, characterized in that, A sealing motor (106) is fixedly installed on one side of the bottom of the sealing frame (105). A sealing gear is fixedly connected to the output end of the sealing motor (106). A toothed groove is opened at the bottom of the upper cover plate (107). The sealing gear is meshed with the toothed groove.

7. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 1, characterized in that, The extruder body (1) includes a base (101), an extrusion guide pipe (108) is fixedly installed on one side of the base (101), a spiral extrusion rod (103) is provided inside the extrusion guide pipe (108), a drive motor (102) is fixedly installed on the other side of the base (101), the output end of the drive motor (102) is fixedly connected to one end of the spiral extrusion rod (103), and an extrusion die (110) is fixedly installed on one end of the extrusion guide pipe (108).

8. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 7, characterized in that, A receiving plate (109) is fixedly connected to the middle of the inner wall of the base (101). The two sides of the receiving plate (109) are inclined, and a guide groove is recessed downward in the middle of the receiving plate (109). One end of the guide groove is corresponding to one end of the extrusion guide pipe (108).

9. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 8, characterized in that, The extrusion die (110) includes a die sleeve (111) and a die core (112). The die sleeve (111) has a die cavity inside, which includes a shrinkage cavity and an output cavity. The output cavity is a circular cavity. The die core (112) includes an output section and a guide section. The output end is a cylinder and is located in the output cavity. The guide section is frustum-shaped and is located in the shrinkage cavity.

10. The extrusion equipment for producing heat-resistant polyethylene pipes as described in claim 7, characterized in that, A support frame is provided in the middle of the extrusion guide tube (108), and a supporting collar (3) is fixedly connected to the top of the support frame. The supporting collar (3) is slidably disposed with the outer wall of the extrusion guide tube (108).

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