A rapid hot melting device for PVC pipes

Abstract

The application provides a rapid hot melting device for PVC pipes, and belongs to the field of pipe processing equipment. The device comprises a base, the upper end of the base is provided with a fixing table and a mounting seat, the mounting seat is connected with a driving part and a protective cover, the mounting seat is connected with a discharging assembly and an extruding assembly, the inside of the extruding assembly is provided with a discharging assembly, the inside of the mounting seat is provided with a cooling cylinder, and the extruding assembly and the discharging assembly are used to improve the extruding quality. The device has the beneficial effects that: through the setting of the discharging assembly, the extruding assembly and the discharging assembly, the feeding stability and the melting extruding quality in the hot melting process of the PVC pipes can be improved, the bridge structure formed between the particles is destroyed, the PVC particles can continuously and uniformly fall, the water inlet groove, the flow guide cavity and the backflow cavity are arranged in the feeding screw rod and the extruding screw rod, the cooling cylinder and the water pump are matched to form a circulating cooling channel, the inside of the feeding cylinder is kept at a stable processing temperature, and the continuous operation stability of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of pipe processing equipment, and more specifically, to a rapid hot-melt device for PVC pipes. Background Technology

[0002] PVC is mainly composed of polyvinyl chloride, with other components added to enhance its heat resistance, toughness, and ductility. It is a popular and widely used synthetic material in the world today. Among the many PVC products, PVC pipe is a commonly used one. It has good performance and is a common auxiliary material in various industries, making production more convenient. The production process of PVC pipe requires heating polyvinyl chloride and related raw materials, and then producing PVC pipes through extrusion molding.

[0003] Existing PVC pipe hot-melt processing equipment typically employs a barrel heating system combined with screw conveying, allowing PVC granules to gradually heat up and plasticize as the screw pushes them. However, in actual processing, due to the poor flowability of PVC granules, they easily accumulate and form bridging phenomena upon entering the feeding area, preventing continuous material flow into the screw and resulting in uneven feeding, which affects the stability of the subsequent melting process. Furthermore, during continuous screw rotation and conveying, significant shear friction heat is generated between the screw and the material. When the equipment operates for extended periods, the internal temperature of the feeding barrel can rise continuously, leading to over-plasticization, thermal decomposition, or changes in melt viscosity of the PVC material, further impacting the extrusion molding quality. Therefore, inventing a rapid hot-melt device for PVC pipes to solve these problems has become a pressing issue for those skilled in the art. Summary of the Invention

[0004] To overcome the above shortcomings, the present invention provides a rapid hot-melt device for PVC pipes, which aims to solve the problems that, during the processing, PVC particles have poor fluidity and are prone to bridging, affecting the stability of the subsequent melting process, and that the temperature inside the feeding cylinder tends to rise continuously during long-term operation of the equipment, affecting the extrusion molding quality.

[0005] This invention is implemented as follows: This invention provides a rapid hot-melt device for PVC pipes, including a base, a fixed platform and a mounting base at the upper end of the base, a drive component and a protective cover connected to the mounting base, a feeding component and an extrusion component connected to the mounting base, a discharge component inside the extrusion component, and a cooling cylinder inside the mounting base. The extrusion component and the discharge component are used to improve the extrusion quality.

[0006] Preferably, the upper end of the base is fixedly connected to the fixed platform, the upper end of the fixed platform is detachably connected to the mounting base, one end of the mounting base is fixedly connected to the driving component, one end of the driving component is fixedly connected to a rotating shaft, the end of the rotating shaft away from the driving component is fixedly connected to the cooling cylinder, a water pump is fixedly connected to the inner wall of the cooling cylinder, and the rotating shaft is rotatably connected to the mounting base.

[0007] Preferably, the feeding assembly includes a feeding cylinder, which is detachably connected to the mounting base. The inside of the feeding cylinder is provided with a dispersing column, and a plurality of support rods are fixedly connected to the outer wall of the dispersing column. The support rods are fixedly connected to the inner wall of the feeding cylinder.

[0008] Preferably, the side wall of the dispersion column is provided with an installation slot, the inner wall of the installation slot is provided with a spiral groove, a top column is slidably connected to the inner wall of the installation slot, the top column has a stepped cross-section, a return spring is sleeved on the outer wall of the top column, the two ends of the return spring are fixedly connected to the inner wall of the installation slot and the side wall of the top column respectively, and a guide block adapted to slide in the spiral groove is fixedly connected to the outer wall of the top column.

[0009] Preferably, the feeding assembly further includes a lifting rod, one end of which is fixedly connected to the top column, and the other end of which is provided with a sliding ball. The outer wall of the lifting rod is provided with a plurality of spiral loosening plates arranged in an array, and a plurality of agitating rods arranged in an array are provided below the spiral loosening plates.

[0010] Preferably, the extrusion assembly includes a feeding cylinder with several electric heating rings inside. The feeding cylinder is fixedly connected to the mounting base. One end of the feeding cylinder is provided with an extrusion seat and an injection tip. The extrusion seat has an inner cylinder inside, and the inner cylinder is connected to an injection head. The outer wall of the injection tip is fitted with a pressure cylinder.

[0011] Preferably, the discharge assembly includes a feeding screw and an extrusion screw. The outer diameter of the extrusion screw is tapered. One end of the feeding screw is fixedly connected to the extrusion screw. The outer diameter of one end of the extrusion screw is the same as that of the feeding screw. The feeding screw is rotatably connected to the mounting base. The outer walls of the feeding screw and the extrusion screw slide against the inner wall of the feeding cylinder.

[0012] Preferably, one end of the feeding screw is fixedly connected to the cooling cylinder, and an extrusion inclined surface is provided on one side of the cooling cylinder. The extrusion inclined surface is slidably connected to the sliding ball. A reflux chamber and a water inlet groove are provided inside the feeding screw and the extrusion screw. The water inlet groove is located inside the reflux chamber, and a one-way valve plate is provided on the inner wall of the water inlet groove.

[0013] Preferably, one end of the feeding screw has a gathering cavity, which is connected to the cooling cylinder, and the inner wall of the gathering cavity is provided with a one-way valve plate.

[0014] Preferably, the end of the extrusion screw away from the feeding screw has a guide cavity, which is connected to the return cavity and the water inlet tank respectively.

[0015] The beneficial effects of this invention are: 1. This invention improves the feeding stability and melt extrusion quality of PVC pipes during the hot-melt process by setting up a feeding component, an extrusion component, and a discharge component. By setting a dispersing column, a spiral loosening plate, and a stirring rod inside the feeding cylinder, and utilizing the periodic pushing action of the extrusion inclined surface on the sliding ball during the rotation of the feeding screw, the lifting rod can generate rotational motion while moving up and down. This causes the spiral loosening plate and the stirring rod to disturb the PVC particles inside the feeding cylinder, destroying the bridging structure formed between the particles, so that the PVC particles can fall continuously and evenly, avoiding the problem of poor feeding caused by material accumulation.

[0016] 2. By cooperating with the feeding screw and the conical extrusion screw, the molten PVC material is subjected to gradually increasing compression during the extrusion process, which improves the density of the melt, reduces the gas entrainment inside the molten material, improves molding stability, and improves the molding quality of PVC pipes. Furthermore, by setting water inlet grooves, guide chambers, and return chambers inside the feeding screw and extrusion screw, and forming a circulating cooling channel with a cooling cylinder and water pump, the coolant can circulate while the screw is rotating continuously, absorbing and carrying away the heat generated by the screw, maintaining a stable processing temperature inside the feeding cylinder, and improving the stability of continuous equipment operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall left side structure of a rapid heat-melting device for PVC pipes provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall right side structure of a rapid heat-melting device for PVC pipes provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the mounting base structure of a rapid heat-melting device for PVC pipes provided by an embodiment of the present invention; Figure 4This is a half-sectional view of the feeding assembly and extrusion assembly of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the internal structure of the feeding cylinder of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the half-section structure of the dispersion column of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of the top column structure of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of a spiral chute structure for a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the material discharge assembly structure of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the connection structure between the feeding screw and the cooling cylinder of a rapid hot-melt device for PVC pipes provided by an embodiment of the present invention; Figure 11 This is a schematic diagram of the internal structure of an extrusion screw for a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention; Figure 12 This is an exploded view of a partial structure of the extrusion assembly of a rapid hot-melt device for PVC pipes provided in an embodiment of the present invention.

[0019] In the diagram: 1. Base; 2. Fixed platform; 3. Drive component; 4. Mounting base; 5. Feeding assembly; 51. Feeding cylinder; 52. Support rod; 53. Dispersing column; 531. Mounting slot; 532. Spiral chute; 54. Spiral loosening plate; 55. Stirring rod; 56. Sliding ball; 57. Lifting rod; 58. Return spring; 59. Top column; 591. Guide block; 6. Protective cover; 7. Extrusion assembly; 71. 72. Feeding cylinder; 73. Extrusion seat; 74. Inner cylinder; 75. Injection head; 76. Electric heating ring; 77. Pressure cylinder; 78. Injection tip; 99. Cooling cylinder; 80. Water pump; 81. One-way valve plate 1; 91. Discharge assembly; 92. Feeding screw; 93. Extrusion inclined plane; 94. Extrusion screw; 95. Gathering chamber; 96. Return chamber; 97. Water inlet tank; 98. One-way valve plate 2; 99. Guide chamber; 10. Rotary shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] Reference Figures 1-12 A rapid hot-melting device for PVC pipes includes a base 1, a fixed platform 2 and a mounting base 4 at the upper end of the base 1, a drive component 3 and a protective cover 6 connected to the mounting base 4, a feeding component 5 and an extrusion component 7 connected to the mounting base 4, a discharge component 9 inside the extrusion component 7, and a cooling cylinder 8 inside the mounting base 4. The extrusion component 7 and the discharge component 9 are used to improve the extrusion quality.

[0022] Furthermore; the upper end of the base 1 is fixedly connected to the fixed platform 2, the upper end of the fixed platform 2 is detachably connected to the mounting base 4, one end of the mounting base 4 is fixedly connected to the driving component 3, one end of the driving component 3 is fixedly connected to a rotating shaft 10, the end of the rotating shaft 10 away from the driving component 3 is fixedly connected to the cooling cylinder 8, the inner wall of the cooling cylinder 8 is fixedly connected to a water pump 81, and the rotating shaft 10 is rotatably connected to the mounting base 4; the extrusion assembly 7 includes a feeding cylinder 71, the inside of the feeding cylinder 71 is provided with several electric heating rings 75, the feeding cylinder 71 is fixedly connected to the mounting base 4, and the feeding cylinder 7 One end of the assembly 1 is provided with an extrusion seat 72 and an injection tip 77. The extrusion seat 72 is provided with an inner cylinder 73, and the inner cylinder 73 is connected to an injection head 74. The outer wall of the injection tip 77 is fitted with a pressure cylinder 76. The discharge assembly 9 includes a feeding screw 91 and an extrusion screw 92. The outer diameter of the extrusion screw 92 is tapered. One end of the feeding screw 91 is fixedly connected to the extrusion screw 92. The outer diameter of one end of the extrusion screw 92 is the same as that of the feeding screw 91. The feeding screw 91 is rotatably connected to the mounting base 4. The outer walls of the feeding screw 91 and the extrusion screw 92 slide against the inner wall of the feeding cylinder 71.

[0023] It should be noted that: the drive component 3 drives the rotating shaft 10 to rotate. Since the rotating shaft 10 is fixedly connected to the cooling cylinder 8, and one end of the feeding screw 91 is fixedly connected to the cooling cylinder 8, the drive component 3 can synchronously drive the cooling cylinder 8, the feeding screw 91, and the extrusion screw 92 fixedly connected to the feeding screw 91 to rotate when working. This causes the feeding screw 91 and the extrusion screw 92 to rotate continuously inside the feeding cylinder 71. Through the clearance fit between the feeding screw 91 and the extrusion screw 92 and the inner wall of the feeding cylinder 71, the PVC particles entering the feeding cylinder 71 are pushed to move along the feeding direction. During the PVC particle conveying process, multiple electric heating rings 75 are set inside the feeding cylinder 71, so that the feeding cylinder 71 forms multiple independent heating zones along the axial direction. Under the pushing action of the feeding screw 91, the PVC particles pass through different temperature zones in sequence, thereby achieving gradual heating and full melting. This avoids the problem of the outer layer of the PVC particles melting too early while the inside is not completely melted due to concentrated heating in a single area, thus improving the melting uniformity.

[0024] The outer diameter of the feeding screw 91 remains basically consistent, enabling it to provide a stable axial pushing force during the feeding stage, allowing the incompletely molten PVC granules to move forward continuously. The extrusion screw 92 adopts a tapered structure that gradually increases in size, and the outer diameter of the end of the extrusion screw 92 closest to the feeding screw 91 is adapted to the feeding screw 91. As the molten material enters the area of ​​the extrusion screw 92, the space inside the feeding cylinder 71 for accommodating the molten material gradually decreases due to the gradual increase in the outer diameter of the extrusion screw 92. This gradually compresses the molten PVC material, increases the density of the material, and squeezes out the air trapped inside the molten material, reducing the generation of air bubbles inside the molded pipe and improving the molding quality of the PVC pipe.

[0025] Reference Figures 5-8 Furthermore, the feeding assembly 5 includes a feeding cylinder 51, which is detachably connected to the mounting base 4. The feeding cylinder 51 has a dispersing column 53 inside, and several support rods 52 are fixedly connected to the outer wall of the dispersing column 53. The support rods 52 are fixedly connected to the inner wall of the feeding cylinder 51. The side wall of the dispersing column 53 has a mounting slot 531, and the inner wall of the mounting slot 531 has a spiral groove 532. A top column 59 is slidably connected to the inner wall of the mounting slot 531. The top column 59 has a stepped cross-section, and its outer wall is fitted with... The return spring 58 has two ends fixedly connected to the inner wall of the mounting slot 531 and the side wall of the top column 59, respectively. The outer wall of the top column 59 is fixedly connected to a guide block 591 that is adapted to slide in the spiral groove 532. The feeding assembly 5 also includes a lifting rod 57. One end of the lifting rod 57 is fixedly connected to the top column 59, and the other end of the lifting rod 57 is provided with a sliding ball 56. The outer wall of the lifting rod 57 is provided with a number of spiral loosening plates 54 arranged in an array, and a number of agitating rods 55 arranged in an array are provided below the spiral loosening plates 54.

[0026] It should be noted that during the rotation of the feeding screw 91, since one end of the feeding screw 91 is fixedly connected to the cooling cylinder 8, and a pressing inclined surface 911 is provided on one side of the cooling cylinder 8, as the feeding screw 91 continues to rotate, the pressing inclined surface 911 can periodically contact the sliding ball 56 and generate pressing force in the direction of rotation. When the pressing inclined surface 911 rotates to the position of contacting the sliding ball 56, the sliding ball 56 is pushed upward, and drives the lifting rod 57 connected to it to move upward synchronously, so that the lifting rod 57 pushes the top column 59 to move along the direction of the mounting slot 531, and at the same time causes the return spring 58 to be compressed and deformed.

[0027] Because the outer wall of the top column 59 is provided with a guide block 591, and the guide block 591 cooperates with the spiral groove 532 inside the dispersion column 53, during the axial movement of the top column 59, the guide block 591 is guided by the spiral groove 532, causing the top column 59 and the lifting rod 57 connected to it to rotate circumferentially, thereby causing the lifting rod 57 to rotate while moving up and down reciprocating; when the extrusion slope 911 continues to rotate and leaves the sliding ball 56, the extrusion force acting on the sliding ball 56 disappears, the return spring 58 releases elastic potential energy, and pushes the top column 59 and the lifting rod 57 back to the initial position. During the process, the return spring 58 enables the lifting rod 57 to form a continuous reciprocating motion, causing the spiral loosening plate 54 and the stirring rod 55 to rotate and lift synchronously. Through the above-mentioned motion, the PVC particles located inside the feeding cylinder 51 are subjected to the rotating cutting and pushing action of the spiral loosening plate 54, as well as the up-and-down disturbance action of the stirring rod 55. This causes loose gaps to be generated between the PVC particles that are piled up, destroys the bridging structure formed between the particles, and promotes the uniform falling of PVC particles towards the feeding screw 91. This avoids the problem of discontinuous feeding caused by the accumulation of PVC particles and improves the stability of the feeding process. Example

[0028] Reference Figures 9-11 Furthermore, one end of the feeding screw 91 is fixedly connected to the cooling cylinder 8, and an extrusion inclined surface 911 is provided on one side of the cooling cylinder 8. The extrusion inclined surface 911 is slidably connected to the sliding ball 56. A return cavity 94 and a water inlet 95 are provided inside the feeding screw 91 and the extrusion screw 92. The water inlet 95 is located inside the return cavity 94, and a one-way valve plate 96 is provided on the inner wall of the water inlet 95. A collection cavity 93 is provided at one end of the feeding screw 91. The collection cavity 93 is connected to the cooling cylinder 8, and a one-way valve plate 82 is provided on the inner wall of the collection cavity 93. A guide cavity 97 is provided at the end of the extrusion screw 92 away from the feeding screw 91. The guide cavity 97 is connected to the return cavity 94 and the water inlet 95 respectively.

[0029] It should be noted that during the continuous rotation of the feeding screw 91 and the extrusion screw 92, shear friction occurs between the screw and the PVC granules, and multiple electric heating rings 75 are installed on the outside of the feeding cylinder 71 to heat the material. Therefore, the internal temperature of the feeding cylinder 71 will gradually increase. To avoid excessive plasticization, thermal decomposition, or changes in melt viscosity of the PVC material due to excessively high internal temperature of the feeding cylinder 71, a temperature sensor is installed near the extrusion end of the feeding cylinder 71. The specific detection method is existing technology and will not be described in detail (not shown in the figure). The temperature sensor is electrically connected to an external controller to detect the temperature change of the molten material area inside the feeding cylinder 71 in real time. When the temperature sensor detects that the internal temperature of the feeding cylinder 71 reaches the preset temperature value, the controller controls the water pump 81 to start, so that the coolant stored in the cooling cylinder 8 circulates. Under the pressure provided by the water pump 81, the coolant pushes the one-way valve plate 96 to open and enters the water inlet 95 formed inside the feeding screw 91 and the extrusion screw 92. Since the water inlet 95 is connected to the guide cavity 97, the coolant entering the water inlet 95 can disperse and flow along the guide cavity 97 to different areas inside the screw, so that the coolant can fully contact the internal wall of the feeding screw 91 and the extrusion screw 92, thereby absorbing the heat generated during the rotation of the screw. Subsequently, the coolant that has absorbed the heat gathers in the direction of the collection cavity 93 along the return cavity 94, and under the action of pressure, pushes the one-way valve plate 82 to open, so that the heated coolant flows back into the cooling cylinder 8. The cooling cylinder 8 can store and cool the returned coolant. The cooled coolant enters the screw again under the action of the water pump 81, thereby forming a continuous cooling process.

[0030] Because the feed screw 91 and extrusion screw 92 are pre-filled with coolant, and the inlet tank 95, guide cavity 97, and return cavity 94 form an interconnected closed circulation channel, the coolant can always flow inside the screw during the rotation of the feed screw 91 and extrusion screw 92, without affecting the screw's conveying, compression, and extrusion of PVC granules. Simultaneously, by circulating and cooling the inside of the screw, the heat accumulation generated by the screw being in a high-temperature environment for a long time can be reduced, maintaining a relatively stable processing temperature inside the feed cylinder 71, improving the uniformity of PVC granule melting, and reducing problems such as bubbles, scorching, and unstable extrusion caused by temperature fluctuations. Furthermore, in the initial working state, the cooling cylinder 8 stores coolant, and the inlet tank 95, guide cavity 97, and return cavity 94 inside the feed screw 91 and extrusion screw 92 are all pre-filled with coolant, enabling the equipment to quickly establish a cooling circulation after startup and improving the response speed to temperature changes inside the feed cylinder 71. In addition, because the cooling cylinder 8 and... The rotating shaft 10 is fixedly connected. When the driving component 3 drives the rotating shaft 10 to rotate, the cooling cylinder 8 will rotate synchronously. The water pump 81, which is located inside the cooling cylinder 8, is fixedly connected to the cooling cylinder 8, so that the water pump 81 can move synchronously with the cooling cylinder 8. There is no relative rotation between the two, so the installation stability and working reliability of the water pump 81 will not be affected by the rotation of the cooling cylinder 8. A conductive slip ring is provided between the rotating shaft 10 and the mounting base 4. The water pump 81 is powered through the conductive slip ring. Alternatively, a waterproof power supply box can be set inside the cooling cylinder 8 to power the water pump 81. The power supply method is not limited to the above description. At the same time, the cooling cylinder 8 stores coolant. The water pump 81 is located in the coolant and can continuously draw coolant. During the rotation of the cooling cylinder 8, the coolant moves synchronously with the cooling cylinder 8 under the constraint of the inner wall of the cooling cylinder 8, thereby ensuring that the water pump 81 can continuously deliver coolant to the circulating cooling channel inside the feeding screw 91 and the extrusion screw 92 to achieve continuous cooling during the screw rotation operation.

[0031] It should be noted that the specific model and specifications of electrical components such as water pumps need to be selected and determined based on the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, so they will not be described in detail here.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A rapid heat-melting device for PVC pipes, comprising a base (1), wherein a fixed platform (2) and a mounting base (4) are provided at the upper end of the base (1), and the mounting base (4) is connected to a driving component (3) and a protective cover (6), characterized in that, The mounting base (4) is connected to the feeding assembly (5) and the extrusion assembly (7). The extrusion assembly (7) is provided with a discharge assembly (9) inside. The mounting base (4) is provided with a cooling cylinder (8) inside. The extrusion assembly (7) and the discharge assembly (9) are used to improve the extrusion quality.

2. The rapid hot-melt device for PVC pipes according to claim 1, characterized in that, The upper end of the base (1) is fixedly connected to the fixed platform (2), the upper end of the fixed platform (2) is detachably connected to the mounting base (4), one end of the mounting base (4) is fixedly connected to the driving component (3), one end of the driving component (3) is fixedly connected to the rotating shaft (10), the end of the rotating shaft (10) away from the driving component (3) is fixedly connected to the cooling cylinder (8), the inner wall of the cooling cylinder (8) is fixedly connected to the water pump (81), and the rotating shaft (10) is rotatably connected to the mounting base (4).

3. The rapid hot-melt device for PVC pipes according to claim 1, characterized in that, The feeding assembly (5) includes a feeding cylinder (51), which is detachably connected to the mounting base (4). The feeding cylinder (51) is provided with a dispersing column (53) inside. Several support rods (52) are fixedly connected to the outer wall of the dispersing column (53), and the support rods (52) are fixedly connected to the inner wall of the feeding cylinder (51).

4. The rapid hot-melt device for PVC pipes according to claim 3, characterized in that, The side wall of the dispersion column (53) is provided with an installation slot (531), the inner wall of the installation slot (531) is provided with a spiral groove (532), the inner wall of the installation slot (531) is slidably connected with a top column (59), the top column (59) has a stepped cross section, the outer wall of the top column (59) is fitted with a return spring (58), the two ends of the return spring (58) are fixedly connected to the inner wall of the installation slot (531) and the side wall of the top column (59) respectively, and the outer wall of the top column (59) is fixedly connected with a guide block (591) that is adapted to slide in the spiral groove (532).

5. A rapid hot-melt device for PVC pipes according to claim 4, characterized in that, The feeding assembly (5) also includes a lifting rod (57), one end of which is fixedly connected to the top column (59), and the other end of which is provided with a sliding ball (56). The outer wall of the lifting rod (57) is provided with a number of arrayed spiral loosening plates (54), and below the spiral loosening plates (54) are a number of arrayed stirring rods (55).

6. A rapid hot-melt device for PVC pipes according to claim 5, characterized in that, The extrusion assembly (7) includes a feeding cylinder (71), which has several electric heating rings (75) inside. The feeding cylinder (71) is fixedly connected to the mounting base (4). One end of the feeding cylinder (71) is provided with an extrusion seat (72) and an injection tip (77). The extrusion seat (72) has an inner cylinder (73) inside. The inner cylinder (73) is connected to an injection head (74). The outer wall of the injection tip (77) is fitted with a pressure cylinder (76).

7. A rapid heat-melting device for PVC pipes according to claim 6, characterized in that, The discharge assembly (9) includes a feeding screw (91) and an extrusion screw (92). The outer diameter of the extrusion screw (92) is tapered. One end of the feeding screw (91) is fixedly connected to the extrusion screw (92). The outer diameter of one end of the extrusion screw (92) is the same as that of the feeding screw (91). The feeding screw (91) is rotatably connected to the mounting base (4). The outer walls of the feeding screw (91) and the extrusion screw (92) slide against the inner wall of the feeding cylinder (71).

8. A rapid heat-melting device for PVC pipes according to claim 7, characterized in that, One end of the feeding screw (91) is fixedly connected to the cooling cylinder (8). An extrusion inclined surface (911) is provided on one side of the cooling cylinder (8). The extrusion inclined surface (911) is slidably connected to the sliding ball (56). A reflux chamber (94) and a water inlet groove (95) are provided inside the feeding screw (91) and the extrusion screw (92). The water inlet groove (95) is located inside the reflux chamber (94). A one-way valve plate (96) is provided on the inner wall of the water inlet groove (95).

9. A rapid heat-melting device for PVC pipes according to claim 8, characterized in that, The feeding screw (91) has a gathering cavity (93) at one end, which is connected to the cooling cylinder (8). The inner wall of the gathering cavity (93) is provided with a one-way valve plate (82).

10. A rapid hot-melt device for PVC pipes according to claim 9, characterized in that, The extrusion screw (92) has a guide cavity (97) at the end away from the feeding screw (91), and the guide cavity (97) is connected to the return cavity (94) and the water inlet tank (95) respectively.

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