A high-efficiency heating device for plastic pipe extrusion molding

Abstract

The present invention discloses an efficient heating device for plastic pipe extrusion molding, and relates to the technical field of plastic pipe production. The efficient heating device for plastic pipe extrusion molding comprises a heating frame, a feed port is fixedly installed on the top of the heating frame, a driving device is fixedly installed on the left side of the heating frame, an extrusion shaft is fixedly installed on the output end of the driving device, and a discharge mold is fixedly installed on the right side of the heating frame. The efficient heating device for plastic pipe extrusion molding can produce plastic pipes through the discharge mold, and the temperature inside the heating frame is transferred to the port of the discharge mold through the heat-conducting metal, so that the port of the discharge mold can be heated to avoid the discharge effect affected by the excessively fast cooling speed of the discharge mold port, and the center rod can be heated through the heat-conducting pipe, so that the temperature of the center rod can be increased to avoid the temperature reduction of the center rod affecting the heating effect of the inner wall of the plastic pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic pipe production, and specifically to an efficient heating device for plastic pipe extrusion molding. Background Art

[0002] When plastic pipes are produced, extrusion molding is required. The utility model patent with the patent publication number CN211763309U relates to an efficient heating device for plastic pipe extrusion molding, including a die head, a mandrel, a profiling sleeve, and a heat insulation bracket. The mandrel is conical, the mandrel penetrates through the die head, the shape of the profiling sleeve matches the shape of the die head, the profiling sleeve is sleeved on the die head through the heat insulation bracket, and a spiral wire groove is provided on the outer wall of the profiling sleeve. The device has a simple structure, can uniformly heat the extrusion die, improves the heating efficiency, reduces the energy consumption, and improves the quality of the pipe. In the above utility model, the inner and outer contour shapes of the annular die head are designed to be the same as the outer contour shape of the mandrel, so that the wall thickness of the die head is basically the same, which is conducive to the plastic fluid being uniformly heated between the annular die head and the mandrel. However, there is no device for preheating and heating the port on the outer side close to the molding die, resulting in the unformed plastic pipe adhering to the port of the die, making the outer wall of the plastic pipe not smooth enough, thus reducing the production quality of the plastic pipe. At the same time, the position in contact with the plastic pipe is not fully heated, which also causes the inner wall of the plastic pipe to be uneven. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the present invention provides an efficient heating device for plastic pipe extrusion molding, which solves the problems raised in the above background art.

[0005] (2) Technical Solutions

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A high-efficiency heating device for plastic pipe extrusion molding, including a heating frame. A feed port is fixedly installed at the top of the heating frame. A driving device is fixedly installed on the left side of the heating frame. An extrusion shaft is fixedly installed at the output end of the driving device. A discharge die is fixedly installed on the right side of the heating frame. A preheating and heat preservation device is arranged on the surface of the discharge die. The preheating and heat preservation device includes a heat preservation sleeve. The heat preservation sleeve is fixedly installed on the outer wall surface of the discharge die. A heat-conducting metal is fixedly installed on the surface of the heat preservation sleeve. The bottom of the heat-conducting metal is fixedly installed on the surface of the heating frame. A sliding rod is installed on the inner wall of the heating frame. A central rod is fixedly installed on the surface of the sliding rod. A heat-conducting pipe is fixedly installed on the left side of the central rod. The bottom of the heat-conducting pipe is fixed to the heating frame. The heat generated by the heating frame is transferred to the inside of the heat preservation sleeve through the heat-conducting metal. The port of the discharge die can be preheated and heat-preserved through the heat preservation sleeve. The heat generated by the heating frame is transferred to the inside of the central rod through the heat-conducting pipe. The inner wall of the plastic pipe can be heated through the central rod.

[0007] Preferably, the inside of the central rod is hollow. A leveling rod is fixedly installed on the right side of the discharge die. The leveling rod is parallel to the outlet of the discharge die, so that the plastic pipe will not bend after separating from the discharge die, avoiding the surface of the plastic pipe from being not smooth due to bending when the plastic pipe solidifies without bending.

[0008] Preferably, a discharge device is arranged on the surface of the heating frame. The discharge device includes a trapezoidal block. The trapezoidal block is slidably sleeved on the top of the heating frame. A transmission rod is fixedly installed at the top of the trapezoidal block. An extrusion plate is fixedly installed at the end of the transmission rod away from the trapezoidal block. An arc-shaped airbag is fixedly installed on the top of the heat preservation sleeve. A jet sleeve is fixedly installed on the surface of the heat preservation sleeve. The arc-shaped airbag is communicated with the jet sleeve through a pipeline. When the extrusion plate moves up and down, it will squeeze the arc-shaped airbag. When the arc-shaped airbag is squeezed, the gas inside the arc-shaped airbag will enter the inside of the jet sleeve through the pipeline, so that the gas will be ejected from the inside of the jet sleeve towards the direction of the discharge die. The gas can improve the forming effect of the plastic pipe. Blowing air at the discharging position can prevent the plastic pipe from adhering to the discharge die.

[0009] Preferably, the lower left side of the trapezoidal block is set as an inclined surface. A first elastic piece is arranged between the trapezoidal block and the heating frame. When the extrusion shaft rotates through the inclined surface, it can push the trapezoidal block to move.

[0010] Preferably, a separating device is provided on the surface of the discharge die. The separating device includes an arc-shaped elastic piece. The arc-shaped elastic piece is fixedly installed on the surface of the extrusion plate. A convex block is fixedly installed at the bottom of the arc-shaped elastic piece. A concave block is fixedly installed on the surface of the discharge die. When the arc-shaped elastic piece moves downward, it will contact the surface of the discharge die, causing the arc-shaped elastic piece to deform on the surface of the discharge die. When the arc-shaped elastic piece deforms, it will drive the convex block to move. When the convex block moves, it will move on the surface of the concave block, causing the convex block to impact the concave block. After the concave block is impacted, it will drive the discharge die to vibrate. By vibrating the discharge die, it can further prevent the plastic pipe from adhering to the inside of the discharge die.

[0011] Preferably, the arc-shaped elastic piece is elastic. The convex block contacts the concave block, so that when the convex block moves, it will impact the concave block.

[0012] Preferably, a sufficient heating device is provided on the surface of the extrusion shaft. The sufficient heating device is an electric push rod on the surface. The electric push rod is fixedly installed on the surface of the extrusion shaft. The output end of the electric push rod is fixedly installed with an arc-shaped plate. A through hole is provided between the upper and lower sides of the arc-shaped plate. A flap is rotatably installed on the inner wall of the through hole. A torsion spring is provided between the flap and the groove. A baffle is fixedly installed on the inner wall of the groove. When the flap moves downward, the baffle will limit the flap, making the flap unable to rotate upward. Then the arc-shaped plate and the flap will push the rubber at the center position towards the inner wall of the heating frame. When the arc-shaped plate moves upward, since the baffle cannot limit the flap, the heating effect of the plastic is improved.

[0013] Preferably, a separating plate is fixedly installed on the inner wall of the heating frame. A fixing block is fixedly installed on the side of the separating plate close to the extrusion shaft. A contact rod is fixedly installed on the right side of the extrusion shaft. The surface of the separating plate is fixedly connected to the central rod through an elastic rod. The sliding rod is slidably installed on the inner wall of the heating frame. When the extrusion shaft rotates, it will drive the contact rod to rotate. When the contact rod rotates, it will contact the fixing block. When the contact rod rotates, it will push the separating plate to deform through the fixing block. When the separating plate deforms, it will push the central rod to move through the elastic rod. The separating plate can separate the plastic so that the plastic that is not completely melted cannot move towards the discharge die, avoiding the impact on the forming effect of the plastic pipe due to incomplete melting of the plastic and preventing the separating plate from being blocked by the unmelted plastic. Since the central rod cannot move, it can prevent the inner wall of the plastic pipe from adhering to the central rod.

[0014] (III) Beneficial effects

[0015] The present invention provides an efficient heating device for plastic pipe extrusion molding. It has the following beneficial effects:

[0016] (1) For this high-efficiency heating device for plastic pipe extrusion molding, when producing plastic pipes, the plastic inside the heating frame can be heated and softened by the heating frame. When the extrusion shaft rotates, it can push the plastic towards the direction of the discharge die. Through the discharge die, plastic pipes can be produced. The temperature inside the heating frame is transmitted to the port of the discharge die through the heat-conducting metal, so that the port of the discharge die can be heated, avoiding the too-fast cooling speed of the discharge die port from affecting the discharging effect. The central rod can be heated through the heat-conducting pipe, thereby increasing the temperature of the central rod and avoiding the reduction of the central rod temperature from affecting the effect of heating the inner wall of the plastic pipe.

[0017] (2) For this high-efficiency heating device for plastic pipe extrusion molding, when the extrusion shaft rotates, it can push the trapezoidal block to move the transmission rod. When the transmission rod moves, it will drive the extrusion plate to move. When the extrusion plate moves, it will squeeze the arc-shaped airbag, causing the gas inside the arc-shaped airbag to spray out from the inside of the jet sleeve. The gas sprayed out by the jet sleeve will blow towards the discharging position of the discharge die. Through the gas, the forming effect of the plastic pipe can be improved, and by blowing air towards the discharging position, the plastic pipe can be prevented from adhering to the discharge die.

[0018] (3) For this high-efficiency heating device for plastic pipe extrusion molding, when the extrusion plate moves, it will drive the arc-shaped elastic sheet to move. The arc-shaped elastic sheet will drive the convex block to move. When the arc-shaped elastic sheet contacts the surface of the discharge die, the arc-shaped elastic sheet will deform, and the convex block will move on the surface of the concave block, causing the convex block to impact the concave block. When the concave block is impacted, it will drive the discharge die to vibrate. By the vibration of the discharge die, the plastic pipe can be further prevented from adhering to the inside of the discharge die.

[0019] (4) For this high-efficiency heating device for plastic pipe extrusion molding, the electric push rod can drive the arc-shaped plate to move up and down. When the arc-shaped plate moves downward, the flap cannot rotate upward due to the limitation of the baffle by the arc-shaped plate. The arc-shaped plate and the flap will push the plastic towards the inner wall direction of the heating frame, improving the heating effect of the plastic. Through the separation plate, the plastic can be separated so that the plastic that has not been completely melted cannot move towards the direction of the discharge die, avoiding the incomplete melting of the plastic from affecting the forming effect of the plastic pipe. When the extrusion shaft rotates, it will drive the contact rod to rotate. When the extrusion rod rotates, it will contact the fixed block, causing the extrusion rod to push the separation plate to deform, avoiding the separation plate from being blocked by the unmelted plastic. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0022] Figure 3Schematic diagram of the jet sleeve structure of the present invention;

[0023] Figure 4 Schematic diagram of the separation plate structure of the present invention;

[0024] Figure 5 Schematic diagram of the arc plate structure of the present invention;

[0025] Figure 6 Schematic diagram of the cross-sectional structure of the arc plate of the present invention.

[0026] In the figure: 1. Heating frame; 2. Feed inlet; 3. Discharge mold; 4. Driving device; 5. Extrusion shaft; 61. Heat preservation sleeve; 62. Heat-conducting metal; 63. Central rod; 64. Slide bar; 65. Heat-conducting tube; 66. Flattening rod; 71. Trapezoidal block; 72. Transmission rod; 73. Extrusion plate; 74. Jet sleeve; 75. Arc-shaped airbag; 76. Arc-shaped elastic piece; 77. Convex block; 78. Concave block; 81. Electric push rod; 82. Arc plate; 83. Flap; 84. Baffle; 85. Separation plate; 86. Fixed block; 87. Contact rod; 88. Elastic rod. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figure 1-6, the present invention provides a technical solution: a high-efficiency heating device for plastic pipe extrusion molding, including a heating frame 1. A feed inlet 2 is fixedly installed at the top of the heating frame 1. A driving device 4 is fixedly installed on the left side of the heating frame 1. An extrusion shaft 5 is fixedly installed at the output end of the driving device 4. A discharge die 3 is fixedly installed on the right side of the heating frame 1. A preheating and heat preservation device is arranged on the surface of the discharge die 3. The preheating and heat preservation device includes a heat preservation sleeve 61 which is fixedly installed on the outer wall surface of the discharge die 3. A heat-conducting metal 62 is fixedly installed on the surface of the heat preservation sleeve 61. The bottom of the heat-conducting metal 62 is fixedly installed on the surface of the heating frame 1. A slide bar 64 is installed inside the heating frame 1. A central rod 63 is fixedly installed on the surface of the slide bar 64. A heat-conducting pipe 65 is fixedly installed on the left side of the central rod 63. The bottom of the heat-conducting pipe 65 is fixed to the heating frame 1. The heating frame 1 heats the plastic particles to melt them. The driving device 4 drives the extrusion shaft 5 to rotate. The extrusion shaft 5 drives the melted plastic inside the heating frame 1 to move towards the discharge die 3. The heat generated by the heating frame 1 is transferred to the inside of the heat preservation sleeve 61 through the heat-conducting metal 62. The heat preservation sleeve 61 can preheat and keep warm the port of the discharge die 3. The heat generated by the heating frame 1 is transferred to the inside of the central rod 63 through the heat-conducting pipe 65. The central rod 63 can heat the inner wall of the plastic pipe.

[0029] The inside of the central rod 63 is hollow. A flattening rod 66 is fixedly installed on the right side of the discharge die 3. The flattening rod 66 is parallel to the outlet of the discharge die 3, so that the plastic pipe will not bend after being separated from the discharge die 3, avoiding bending when the plastic pipe solidifies without bending, resulting in an uneven surface of the plastic pipe.

[0030] A discharge device is arranged on the surface of the heating frame 1. The discharge device includes a trapezoidal block 71 which is slidably sleeved on the top of the heating frame 1. A transmission rod 72 is fixedly installed at the top of the trapezoidal block 71. An extrusion plate 73 is fixedly installed at the end of the transmission rod 72 away from the trapezoidal block 71. An arc-shaped airbag 75 is fixedly installed at the top of the heat preservation sleeve 61. An air jet sleeve 74 is fixedly installed on the surface of the heat preservation sleeve 61. The arc-shaped airbag 75 is communicated with the air jet sleeve 74 through a pipeline. The extrusion shaft 5 will push the trapezoidal block 71 upward. After the extrusion shaft 5 is separated from the trapezoidal block 71, the trapezoidal block 71 will be driven to move downward under the elastic force of the first elastic piece, so that the trapezoidal block 71 will drive the transmission rod 72 and the extrusion plate 73 to move downward when moving up and down. When the extrusion plate 73 moves up and down, it will squeeze the arc-shaped airbag 75. When the arc-shaped airbag 75 is squeezed, the gas inside the arc-shaped airbag 75 will enter the inside of the air jet sleeve 74 through the pipeline, so that the gas will be ejected from the inside of the air jet sleeve 74 towards the discharge die 3. The gas can improve the forming effect of the plastic pipe. Blowing air at the discharging position can prevent the plastic pipe from adhering to the discharge die 3.

[0031] The lower left side of the trapezoidal block 71 is set as an inclined plane. A first elastic sheet is arranged between the trapezoidal block 71 and the heating frame 1. When the extrusion shaft 5 rotates through the inclined plane, the trapezoidal block 71 can be pushed to move.

[0032] A separating device is arranged on the surface of the discharging die 3. The separating device includes an arc-shaped elastic sheet 76. The arc-shaped elastic sheet 76 is fixedly installed on the surface of the extrusion plate 73. A convex block 77 is fixedly installed at the bottom of the arc-shaped elastic sheet 76. A concave block 78 is fixedly installed on the surface of the discharging die 3. When the arc-shaped elastic sheet 76 moves downward, it will contact the surface of the discharging die 3, causing the arc-shaped elastic sheet 76 to deform on the surface of the discharging die 3. When the arc-shaped elastic sheet 76 deforms, it will drive the convex block 77 to move. When the convex block 77 moves, it will move on the surface of the concave block 78, causing the convex block 77 to impact the concave block 78. After being impacted, the concave block 78 will drive the discharging die 3 to vibrate. By vibrating the discharging die 3, it can further prevent the plastic pipe from adhering to the inside of the discharging die 3.

[0033] The arc-shaped elastic sheet 76 has elasticity. When the convex block 77 contacts the concave block 78, the convex block 77 will impact the concave block 78 when it moves.

[0034] A sufficient heating device is arranged on the surface of the extrusion shaft 5. The sufficient heating device includes an electric push rod 81 on its surface. The electric push rod 81 is fixedly installed on the surface of the extrusion shaft 5. The output end of the electric push rod 81 is fixedly installed with an arc-shaped plate 82. Through holes are formed between the upper and lower sides of the arc-shaped plate 82. A flap 83 is rotatably installed on the inner wall of the through hole. A torsion spring is arranged between the flap 83 and the groove. A baffle 84 is fixedly installed on the inner wall of the groove. When the electric push rod 81 moves up and down, it will drive the arc-shaped plate 82 to move up and down. When the arc-shaped plate 82 moves downward, it will drive the flap 83 to move downward. When the flap 83 moves downward, the baffle 84 will limit the flap 83, making the flap 83 unable to rotate upward. Thus, the arc-shaped plate 82 and the flap 83 will push the rubber at the center position towards the inner wall direction of the heating frame 1. When the arc-shaped plate 82 moves upward, since the baffle 84 cannot limit the flap 83, the heating effect of the plastic is improved.

[0035] A separation plate 85 is fixedly installed on the inner wall of the heating frame 1. A fixed block 86 is fixedly installed on the side of the separation plate 85 close to the extrusion shaft 5. A contact rod 87 is fixedly installed on the right side of the extrusion shaft 5. The surface of the separation plate 85 is fixedly connected to the central rod 63 through an elastic rod 88. The sliding rod 64 is slidably installed on the inner wall of the heating frame 1. When the extrusion shaft 5 rotates, it will drive the contact rod 87 to rotate. When the contact rod 87 rotates, it will contact the fixed block 86, so that when the contact rod 87 rotates, it will push the separation plate 85 to deform through the fixed block 86. When the separation plate 85 deforms, it will push the central rod 63 to move through the elastic rod 88. Through the separation plate 85, the plastic can be separated so that the plastic that has not been completely melted cannot move towards the discharge die 3, avoiding the influence of incompletely melted plastic on the forming effect of the plastic pipe and preventing the separation plate 85 from being blocked by unmelted plastic. Since the central rod 63 cannot move, it can prevent the inner wall of the plastic pipe from adhering to the central rod 63.

[0036] During operation (or use), when producing plastic pipes, plastic particles enter the interior of the heating frame 1 through the feed port 2. The heating frame 1 heats the plastic particles to melt them. The driving device 4 drives the extrusion shaft 5 to rotate. The extrusion shaft 5 drives the melted plastic inside the heating frame 1 to move towards the discharge die 3. The heat generated by the heating frame 1 is transferred to the interior of the heat preservation sleeve 61 through the heat-conducting metal 62. The heat preservation sleeve 61 can preheat and keep warm the port of the discharge die 3. The heat generated by the heating frame 1 is transferred to the interior of the central rod 63 through the heat-conducting pipe 65. The central rod 63 can heat the inner wall of the plastic pipe. The flattening rod 66 can prevent the plastic pipe emerging from the discharge die 3 from being parallel to the discharge die 3.

[0037] When the extrusion shaft 5 rotates, it will contact the inclined surface of the trapezoidal block 71, so that the extrusion shaft 5 will push the trapezoidal block 71 to move upward. After the extrusion shaft 5 separates from the trapezoidal block 71, the trapezoidal block 71 will be driven to move downward under the elastic force of the first elastic piece. When the trapezoidal block 71 moves up and down, it will drive the transmission rod 72 and the extrusion plate 73 to move downward. When the extrusion plate 73 moves up and down, it will squeeze the arc-shaped airbag 75. When the arc-shaped airbag 75 is squeezed, the gas inside the arc-shaped airbag 75 will enter the interior of the jet sleeve 74 through the pipeline, so that the gas will be ejected from the interior of the jet sleeve 74 towards the discharge die 3.

[0038] When the pressing plate 73 moves up and down, it will drive the arc-shaped elastic piece 76 to move up and down. When the arc-shaped elastic piece 76 moves down, it will contact the surface of the discharge die 3, causing the arc-shaped elastic piece 76 to deform on the surface of the discharge die 3. When the arc-shaped elastic piece 76 deforms, it will drive the convex block 77 to move. When the convex block 77 moves, it will move on the surface of the concave block 78, causing the convex block 77 to impact the concave block 78, and the concave block 78 will drive the discharge die 3 to vibrate after being impacted;

[0039] When the electric push rod 81 moves up and down, it will drive the arc-shaped plate 82 to move up and down. When the arc-shaped plate 82 moves down, it will drive the flap 83 to move down. When the flap 83 moves down, the baffle 84 will limit the flap 83, making it impossible for the flap 83 to rotate upward. Thus, the arc-shaped plate 82 and the flap 83 will push the rubber at the center position towards the inner wall direction of the heating frame 1. When the arc-shaped plate 82 moves up, since the baffle 84 cannot limit the flap 83, the flap 83 can rotate downward, thereby reducing the movement of the plastic driven by the arc-shaped plate 82 towards the center position;

[0040] When the extrusion shaft 5 rotates, it will drive the contact rod 87 to rotate. When the contact rod 87 rotates, it will contact the fixed block 86, causing the contact rod 87 to push the separation plate 85 to deform through the fixed block 86 when it rotates. When the separation plate 85 deforms, it will push the central rod 63 to move through the elastic rod 88.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient heating device for plastic pipe extrusion molding, comprising a heating frame (1), characterized in that: A feed port (2) is fixedly mounted on the top of the heating frame (1), a driving device (4) is fixedly mounted on the left side of the heating frame (1), an extrusion shaft (5) is fixedly mounted on the output end of the driving device (4), a discharge die (3) is fixedly mounted on the right side of the heating frame (1), a preheating and heat-insulating device is arranged on the surface of the discharge die (3), the preheating and heat-insulating device comprises a heat-insulating sleeve (61), the heat-insulating sleeve (61) is fixedly mounted on the outer wall surface of the discharge die (3), a heat-conducting metal (62) is fixedly mounted on the surface of the heat-conducting metal (62), the bottom of the heat-conducting metal (62) is fixedly mounted on the surface of the heating frame (1), a sliding rod (64) is mounted on the inner wall of the heating frame (1), a center rod (63) is fixedly mounted on the surface of the sliding rod (64), and a heat-conducting pipe (65) is fixedly mounted on the left side of the center rod (63). ), the bottom of the heat-conducting pipe (65) is fixed to the heating frame (1); the interior of the central rod (63) is hollow, and a leveling rod (66) is fixedly installed on the right side of the discharge mold (3); a discharge device is arranged on the surface of the heating frame (1), and the discharge device comprises a trapezoidal block (71), the sliding sleeve of the trapezoidal block (71) is connected to the top of the heating frame (1), a transmission rod (72) is fixedly installed on the top of the trapezoidal block (71), and an extrusion plate (73) is fixedly installed on the end of the transmission rod (72) away from the trapezoidal block (71); an arc-shaped airbag (75) is fixedly installed on the top of the insulation sleeve (61), and an injection sleeve (74) is fixedly installed on the surface of the insulation sleeve (61), and the arc-shaped airbag (75) is connected to the injection sleeve (74) through a pipeline; the extrusion shaft (5) will push the trapezoidal block (71) to move upward.

2. The high-efficiency heating device for plastic pipe extrusion molding according to claim 1 is characterized in that: The lower left portion of the trapezoidal block (71) is arranged as an inclined surface, and a first spring sheet is arranged between the trapezoidal block (71) and the heating frame (1).

3. The high-efficiency heating device for plastic pipe extrusion molding according to claim 2 is characterized in that: The surface of the discharge die (3) is provided with a disengagement device, the disengagement device comprising an arc-shaped spring piece (76), the arc-shaped spring piece (76) is fixedly mounted on the surface of the extrusion plate (73), a convex block (77) is fixedly mounted on the bottom of the arc-shaped spring piece (76), and a concave block (78) is fixedly mounted on the surface of the discharge die (3).

4. The high-efficiency heating device for plastic pipe extrusion molding according to claim 3 is characterized in that: The arc-shaped spring piece (76) is elastic, and the convex block (77) is in contact with the concave block (78).

5. The high-efficiency heating device for plastic pipe extrusion molding according to claim 4 is characterized in that: A sufficient heating device is provided on the surface of the extrusion shaft (5), and an electric push rod (81) is provided on the surface of the sufficient heating device. The electric push rod (81) is fixedly mounted on the surface of the extrusion shaft (5), and an arc plate (82) is fixedly mounted on the output end of the electric push rod (81). A through hole is provided between the upper and lower sides of the arc plate (82), and a flap (83) is rotatably mounted on the inner wall of the through hole. A torsion spring is provided between the flap (83) and the groove, and a baffle (84) is fixedly mounted on the inner wall of the groove.

6. The high-efficiency heating device for plastic pipe extrusion molding according to claim 5 is characterized in that: A separation plate (85) is fixedly mounted on the inner wall of the heating frame (1); a fixing block (86) is fixedly mounted on a side of the separation plate (85) close to the extrusion shaft (5); a contact rod (87) is fixedly mounted on the right side of the extrusion shaft (5); a surface of the separation plate (85) is fixedly connected to the center rod (63) via an elastic rod (88); and the sliding rod (64) is slidably mounted on the inner wall of the heating frame (1).

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