Extrusion forming equipment for PVC pipeline production

Abstract

The invention discloses extrusion forming equipment for PVC pipeline production, relates to the technical field of PVC pipeline injection molding, and aims at solving the problem that the masses of prepared PVC pipes at different positions are different due to the fact that uniform mixing is not achieved at the beginning. The stirring effect and the heating uniformity are improved through rotary stirring, then the first-stage mixing disc moves upwards, downward negative pressure is generated by the first-stage mixing disc, molten liquid is extruded out of a plurality of material distribution holes, meanwhile, the transfer column drives the second-stage mixing disc to rotate, and due to the fact that the molten liquid has viscosity, the molten liquid can be extruded out of the second-stage mixing disc. The second-stage mixing disc is arranged, so that solutions extruded from the material distribution holes fall off in a staggered manner under the rotation of the second-stage mixing disc, and finally, the solutions are mixed in different forms in a solution state, so that uniform mixing at the beginning is ensured, and the raw material mixing proportion deviation degree is greatly reduced in a spiral conveying stage.

Description

Technical Field

[0001] The invention relates to the technical field of PVC pipe injection molding, and in particular to an extrusion molding device for producing PVC pipes. Background Art

[0002] PVC (polyvinyl chloride) pipe injection molding is an important process for manufacturing PVC pipes. First of all, raw material preparation is the key first step. PVC resin is mixed evenly with appropriate additives (such as stabilizers, lubricants, plasticizers, etc.) in a certain proportion. These additives can improve the performance of PVC. For example, stabilizers can prevent PVC from decomposing during processing and use, and lubricants help the material flow better in the injection molding machine. Then, the mixed raw materials are placed in the barrel of the injection molding machine. The injection molding machine heats the raw materials to a molten state. Under a certain pressure, the molten PVC material is injected into the pre-designed pipe mold cavity. The shape and size of the mold determine the final shape of the PVC pipe. Then, after the cooling and curing stage, the PVC material is shaped into a pipe in the mold. Finally, the mold is opened and the molded PVC pipe is taken out. After subsequent quality inspection and simple processing, the finished PVC pipe is obtained.

[0003] Application number 202122017793.6 discloses a new type of injection molding equipment for PVC pipe processing. The driving motor drives the stirring rod to rotate, and the rotating stirring rod can be used to break up the raw materials inside the barrel. By breaking up the raw materials that have condensed into blocks inside the barrel, the raw materials inside the barrel can be prevented from being blocked and unable to fall into the interior of the injection component.

[0004] Furthermore, in a plastic injection molding machine for pipe processing disclosed with application number 202410672425.0, plastic material particles enter the heating component through a feeding component. After the fixed mold component and the movable mold component are closed, the spiral extrusion rod inside the plastic injection tube starts to rotate driven by the motor, pushing the plastic particles in the feeding component forward. The heating component increases the heat at the front end of the plastic injection tube to melt the plastic particles into uniform molten plastic. The molten plastic enters the injection extrusion cavity through the through holes at the rear end of the outflow cavity and the reflux sealing ring group.

[0005] However, in the above-mentioned prior art, the raw materials are fed through a feeding mechanism and then melted, and then the molten liquid is transported, extruded and injection molded to prepare the PVC pipe. Since the raw materials entering the heating chamber are still granular materials, the particles have a particle size and are far less contacted and mixed than the solution state. If they are not mixed evenly at the beginning, it is easy to cause a large deviation in the local raw material mixing ratio during the spiral conveying stage, which leads to different qualities of different positions of the prepared PVC pipe, affecting the factory quality of the PVC pipe.

[0006] Therefore, a kind of PVC pipe production extrusion molding equipment is needed. Summary of the invention

[0007] In order to solve all or part of the above problems, the purpose of the present invention is to provide an extrusion molding equipment for PVC pipe production, so as to solve the problem that the raw materials are not mixed evenly at the beginning, which easily leads to large deviations in the local mixing ratio of raw materials during the spiral conveying stage, thus resulting in different qualities of different positions of the prepared PVC pipe.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an extrusion molding device for PVC pipe production, comprising a support table, a driving main machine is installed at one end of the side surface of the support table, a transfer shell is installed on one side of the driving main machine, a feeding mechanism 1 is installed at the upper end of the transfer shell, the lower end of the feeding mechanism 1 is connected to the inner cavity of the transfer shell, a spiral pusher is installed on the inner side of the transfer shell, one end of the spiral pusher is connected to the driving end of the driving main machine, a heating shell is installed on the transfer shell located outside the spiral pusher, an injection molding head is installed at one end of the heating shell away from the transfer shell, the injection molding head is connected to the inner side of the heating shell, the feeding mechanism 1 includes a raw material mixing bin, and a connecting shell is installed at the lower end of the raw material mixing bin A primary mixing disk is slidably arranged in the middle of the inner side of the connecting shell, and the primary mixing disk is adapted to the inner side of the connecting shell, one side of the primary mixing disk movably penetrates the connecting shell and is connected to a driving mechanism, a transfer column is connected to the middle of the primary mixing disk, a heating element is arranged on the transfer column on the upper side of the primary mixing disk, and multiple groups of heating elements are arranged, and a secondary mixing disk is rotatably installed at the lower end of the transfer column, and multiple material distribution holes are opened on the secondary mixing disk, and the middle part of the transfer column is in a threaded matching relationship with the primary mixing disk, and the driving mechanism drives the primary mixing disk to move downward to extrude the raw materials to flow out from the material distribution holes, and at the same time, the primary mixing disk drives the transfer column to rotate, thereby driving the spiral sheet, the heating element and the secondary mixing disk to rotate to mix the raw materials.

[0009] Furthermore, the upper end of the transfer column is rotatably connected to a support member arranged at the upper end of the inner side of the connecting shell, and a spiral blade is installed on the transfer column located at the lower side of the support member. The input end of the spiral blade corresponds to the output end of the raw material mixing bin, and the rotation of the spiral blade can drive the raw material to be transported downward.

[0010] Furthermore, the heating element is located between the spiral blade and the primary mixing disk, and the secondary mixing disk is located at the lower side of the primary mixing disk.

[0011] Furthermore, a thread groove is provided in the middle of the transfer column, and a ball is movably provided in the middle of the first-stage mixing disk, and the ball matches the thread groove.

[0012] Furthermore, the first-level mixing disk is provided with a plurality of guide holes, and a plug is provided at the lower end of each guide hole. A connecting column is fixedly installed at the upper end of the plug, and the upper end of the connecting column is slidably connected to the first-level mixing disk and will not fall off the first-level mixing disk when sliding downward.

[0013] Furthermore, the driving mechanism includes a connecting shell and a servo motor arranged in the middle of one side of the connecting shell, the driving end of the servo motor passes through the connecting shell, and the driving end of the servo motor located on the inner side of the connecting shell is installed with a driving gear.

[0014] Furthermore, one side of the connecting shell is fixedly connected to a feeding mechanism, one side of the driving gear is meshed with a driven driving member, and the driven driving member penetrates the connecting shell and is fixedly connected to the primary mixing disk.

[0015] Furthermore, a feeding mechanism 2 is provided on the other side of the connecting shell, and the feeding mechanism 1 has the same structural composition as the feeding mechanism 2. A driven driving member 1 and a driven driving member 2 are meshed on both sides of the driving gear, and the driven driving member 1 has the same structural composition as the driven driving member 2. The servo motor drives the driving gear to rotate and then drives the driven driving member 1 to drive, and the driven driving member 1 then drives the first-stage mixing disk on the feeding mechanism 1 to move upward, and at the same time, the driving gear can drive the driven driving member 2 to drive the first-stage mixing disk on the feeding mechanism 2 to move downward, thereby realizing preliminary mixing while realizing the alternating operation of the feeding mechanism 1 and the feeding mechanism 2.

[0016] Furthermore, the driven driving member includes a driven gear, which is meshed and connected with the driving gear. One end of the driven gear is rotatably connected to the connecting shell, and the other end of the driven gear is fixedly provided with a driving gear. A reciprocating gear ring is provided on the outer side of the driving gear, and an extension rod is fixedly installed on one side of the reciprocating gear ring, and one end of the extension rod is fixedly connected to the primary mixing disk.

[0017] Furthermore, the outer side of the driving gear is provided with a half-toothed reciprocating gear ring, and the inner side of the reciprocating gear ring is meshed with the teeth on the outer side of the driving gear.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides an extrusion molding device for PVC pipe production. The raw materials enter the raw material mixing bin for mixing. The driving mechanism drives the first-level mixing disk to move downward. At this time, the thread of the first-level mixing disk causes the transfer column to rotate, firstly driving the spiral sheet to rotate spirally to transport the raw materials from the raw material mixing bin to between the lower end of the spiral sheet and the first-level mixing disk. At the same time, the heating element heats the raw materials while stirring. The rotation and stirring not only improves the stirring effect but also improves the effect of heating uniformity. Then the first-level mixing disk moves upward. At this time, the molten liquid passes through the first-level mixing disk and falls between the first-level mixing disk and the second-level mixing disk. When the first-level mixing disk moves downward again, the first-level mixing The upper side of the disk carries out material discharge and melting simultaneously, while the lower primary mixing disk generates downward negative pressure, so that the molten liquid is squeezed out from multiple distribution holes, further improving the mixing effect in the molten liquid state. At the same time, the transfer column drives the secondary mixing disk to rotate. Since the molten liquid has viscosity, the solution squeezed out from the distribution holes falls in an interlaced manner under the rotation of the secondary mixing disk, further improving the mixing effect in the molten liquid state, and finally achieving different forms of mixing in the solution state, ensuring uniform mixing from the beginning, greatly reducing the deviation of the raw material mixing ratio in the spiral conveying stage, so that the quality of the prepared PVC pipes at different positions is the same, and the factory quality of the PVC pipes is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the extrusion molding equipment for producing PVC pipes of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal planar structure of the heating shell of the extrusion molding equipment for producing PVC pipes of the present invention;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the feeding mechanism 1 and the driving mechanism 2 of the extrusion molding equipment for PVC pipe production of the present invention;

[0023] Figure 4 Schematic diagram of the internal structure of the feeding mechanism 1 and the driving mechanism 2 of the extrusion molding equipment for PVC pipe production of the present invention Figure 1 ;

[0024] Figure 5 It is a schematic diagram of a disassembled three-dimensional structure of a feeding mechanism of an extrusion molding device for producing PVC pipes of the present invention;

[0025] Figure 6 Extrusion molding equipment for producing PVC pipes of the present invention Figure 5 A schematic diagram of the enlarged structure at point A;

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of a driven driving member 1 and a primary mixing disk of the extrusion molding equipment for producing PVC pipes of the present invention;

[0027] Figure 8 Schematic diagram of the internal structure of the feeding mechanism 1 and the driving mechanism 2 of the extrusion molding equipment for PVC pipe production of the present invention Figure 2 ;

[0028] Fig. 9 It is a schematic diagram of the internal planar structure of the feeding mechanism 1 and the driving mechanism 2 of the extrusion molding equipment for PVC pipe production of the present invention.

[0029] In the figure:

[0030] 1. Support table; 2. Controller; 3. Driving host; 31. Screw pusher; 4. Transfer shell; 5. Raw material mixing bin; 51. Connecting shell; 511. Support; 52. Primary mixing disk; 521. Ball; 522. Guide hole; 523. Connecting column; 524. Blocking plate; 53. Transfer column; 54. Spiral sheet; 55. Heating element; 551. Threaded groove; 56. Secondary mixing disk; 561. Material distribution hole; 6. Unloading mechanism 2; 7. Heating shell; 8. Injection head; 9. Driving mechanism; 91. Connecting shell; 92. Servo motor; 93. Driving gear; 94. Driven drive member 1; 95. Driven drive member 2; 941. Driven gear; 942. Driving gear; 943. Reciprocating gear ring; 944. Extension rod;. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-Figure 2As shown in the figure, an extrusion molding device for PVC pipe production includes a support table 1 for supporting the entire device. At one end of the upper side of the support table 1, a driving host 3 is installed. Preferably, the driving host 3 is composed of a motor, a reducer, and a connecting shaft. On one side of the driving host 3, a controller 2 is installed by screws. The controller 2 is also installed on one side of the support table 1. The controller 2 can control the operation of the motor and the reducer. On the side of the driving host 3 away from the controller 2, a transfer shell 4 is installed. At the upper end of the transfer shell 4, a feeding mechanism 1 is installed. The lower end of the feeding mechanism 1 is communicated with the inner cavity of the transfer shell 4. The transfer shell 4 is also installed on the upper side of the support table 1 by screws. At the same time, a spiral pusher 31 is installed inside the transfer shell 4. One end of the spiral pusher 31 is axially connected to one end of the connecting shaft. On the transfer shell 4 outside the spiral pusher 31, a heating shell 7 is installed. The heating shell 7 is composed of a metal shell and heating wires arranged inside it, and is also controlled by the controller 2. At the end of the heating shell 7 away from the transfer shell 4, an injection head 8 is installed. The injection head 8 is communicated with the inside of the heating shell 7. The output end of the injection head 8 is connected to the input end of the PVC pipe mold set. The heating shell 7 and the injection head 8 are both fixedly supported by the support table 1.

[0033] As Figure 3-Figure 5 shown, the feeding mechanism 1 includes a raw material mixing bin 5 for initially mixing granular raw materials. At the lower end of the raw material mixing bin 5, a connecting shell 51 for closed material transportation is installed. In the middle of the inner side of the connecting shell 51, a first-stage mixing disk 52 for moving up and down to extrude and push the molten liquid is slidably arranged. The first-stage mixing disk 52 is adapted to the inner side of the connecting shell 51. One side of the first-stage mixing disk 52 movably penetrates through the connecting shell 51 and is connected to a driving mechanism 9. In the middle of the first-stage mixing disk 52, a transfer column 53 is threadedly connected. The transfer column 53 is divided into an upper part, a middle part, and a lower part. The upper part is located above the transfer column 53 and the upper end is rotatably connected to a support member 511 installed on the inner side of the connecting shell 51 for supporting the connecting shell 51. A spiral blade 54 is installed on the upper part below the support member 511. The input end of the spiral blade 54 corresponds to the output end of the raw material mixing bin 5. The rotation of the spiral blade 54 can drive the raw materials to be transported downward. A heating member 55 is also arranged on the upper part between the spiral blade 54 and the first-stage mixing disk 52. There are multiple groups of the heating members 55, and each group is arranged in a "soil" shape, which is beneficial to initially heating and stirring and mixing the granular raw materials. The lower part of the transfer column 53 is located below the first-stage mixing disk 52, and a second-stage mixing disk 56 is rotatably installed at the lower end of the lower part. A plurality of material distribution holes 561 are opened on the second-stage mixing disk 56. Further, the middle part of the transfer column 53 is in a threaded matching relationship with the first-stage mixing disk 52. The up and down movement of the first-stage mixing disk 52 can cause the transfer column 53 to rotate, thereby driving the spiral blade 54, the heating member 55, and the second-stage mixing disk 56 to rotate.

[0034] Specifically, the raw materials enter the raw material mixing bin 5 for mixing, and the driving mechanism 9 drives the primary mixing disc 52 to move downward. At this time, the thread of the primary mixing disc 52 causes the transfer column 53 to rotate, firstly driving the spiral sheet 54 to spirally rotate to transport the raw materials from the raw material mixing bin 5 to between the lower end of the spiral sheet 54 and the primary mixing disc 52. At the same time, the heating element 55 heats the raw materials while stirring them. The rotating stirring not only improves the stirring effect but also improves the effect of heating uniformity. Then, the primary mixing disc 52 moves upward. At this time, the molten liquid passes through the primary mixing disc 52 and falls into the primary mixing disc 52 and the secondary mixing disc 56. In the meantime, when the first-level mixing disk 52 moves downward again, the upper side of the first-level mixing disk 52 simultaneously discharges and melts the materials, while the lower first-level mixing disk 52 generates downward negative pressure, so that the molten liquid is squeezed out from the multiple material distribution holes 561, further improving the mixing effect in the molten liquid state. At the same time, the transfer column 53 drives the secondary mixing disk 56 to rotate. Since the molten liquid has viscosity, the solution squeezed out from the material distribution holes 561 falls in an staggered manner under the rotation of the secondary mixing disk 56, further improving the mixing effect in the molten liquid state, and finally achieving different forms of mixing in the solution state to ensure uniform mixing from the beginning.

[0035] It should be noted that since the spiral blade 54 has two fewer layers, when it rotates in the reverse direction, only the first circle will send the raw materials back upward. After the first circle, the raw materials are always located on the upper side of the spiral blade 54. When it rotates in the forward direction, the raw materials will continue to be discharged after the first circle, and it will not affect the secondary discharge.

[0036] like Figure 5-Figure 6 As shown, a thread groove 551 is provided in the middle of the transfer column 53, and the number of thread turns of the thread groove 551 is at least four. A ball 521 is movably provided in the middle of the primary mixing disk 52, and the ball 521 matches the thread groove 551. When the primary mixing disk 52 moves up and down, the ball 521 cooperates with the thread groove 551 to make the transfer column 53 rotate, thereby realizing synchronous driving of the spiral sheet 54, the heating element 55 and the secondary mixing disk 56 to rotate.

[0037] like Figure 5 and Figure 7As shown, the primary mixing disk 52 is provided with a plurality of guide holes 522 for solution circulation, and a plugging piece 524 for closing the guide hole 522 is provided at the lower end of each guide hole 522, and a connecting column 523 for guiding is fixedly installed at the upper end of the plugging piece 524, and the upper end of the connecting column 523 is slidably connected to the primary mixing disk 52 and will not fall off the primary mixing disk 52 when sliding downward, and when the primary mixing disk 52 moves upward, the plugging piece 524 is driven downward by the flow of the solution and the action of gravity. The molten liquid can flow out from between the guide hole 522 and the plugging piece 524. When the primary mixing disk 52 moves downward, the solution almost fills the upper side of the secondary mixing disk 56, thereby making the lower layer of the primary mixing disk 52 tend to be sealed. At this time, the primary mixing disk 52 moves downward, causing the solution to push the plugging piece 524 upward, so that the plugging piece 524 and the guide hole 522 fit and seal, thereby allowing the primary mixing disk 52 to push the solution downward and squeeze it out from the distribution hole 561, so that extrusion mixing can be performed.

[0038] like Figure 3-Figure 4 and Figure 8-Figure 9 As shown, further, the driving mechanism 9 includes a connecting shell 91 for protection and a servo motor 92 arranged in the middle of one side of the connecting shell 91. One side of the connecting shell 91 is fixedly connected to the unloading mechanism 1, and the other side of the connecting shell 91 is provided with the unloading mechanism 2 6. The unloading mechanism 1 and the unloading mechanism 2 6 have the same structure. The servo motor 92 is also controlled by the controller 2. The driving end of the servo motor 92 passes through the connecting shell 91, and the driving end of the servo motor 92 located on the inner side of the connecting shell 91 is installed with a driving gear 93. The two sides of the driving gear 93 are meshed with a driven driving member 1 94 and a driven driving member 2 95. The driven driving member 1 94 penetrates through the connecting shell 51 and is fixedly connected with the primary mixing disk 52. The driven driving member 1 94 and the driven driving member 2 95 have the same structure. The servo motor 92 drives the driving gear 93 to rotate and then drives the driven driving member 1 94 to drive. The driven driving member 1 94 then drives the primary mixing disk 52 on the unloading mechanism 1 to move upward. At the same time, the driving gear 93 can drive the driven driving member 2 95 to drive the primary mixing disk 52 on the unloading mechanism 2 6 to move downward, thereby realizing preliminary mixing while realizing the alternating operation of the unloading mechanism 1 and the unloading mechanism 2 6, realizing uninterrupted feeding operation and improving the pipe making speed.

[0039] like Figure 8As shown, further, the driven driving member 94 includes a driven gear 941, which is meshed with the driving gear 93, one end of the driven gear 941 is rotatably connected to the connecting shell 91, and the other end of the driven gear 941 is fixedly provided with a driving gear 942, the outer side of the driving gear 942 is provided with half of the teeth, and the outer side of the driving gear 942 is provided with a reciprocating gear ring 943, the inner side of the reciprocating gear ring 943 is meshed with the teeth on the outer side of the driving gear 942, and the reciprocating gear ring 943 is meshed with the teeth on the outer side of the driving gear 942. An extension rod 944 is fixedly installed on one side of the gear ring 943, and one end of the extension rod 944 is fixedly connected to the primary mixing disk 52. The driven gear 941 rotates to drive the driving gear 942 to rotate. When the teeth of the driving gear 942 engage with the teeth on one side of the reciprocating gear ring 943, the reciprocating gear ring 943 is driven to move upward until the teeth of the driving gear 942 engage with the teeth on the other side of the reciprocating gear ring 943, causing the reciprocating gear ring 943 to move downward, thereby realizing reciprocating movement.

[0040] It should be noted that, in the description of the present application, it should be understood that the terms "length", "thickness", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An extrusion molding device for producing PVC pipes, comprising a support table (1), a driving main machine (3) is installed at one end of the upper side of the support table (1), a transfer shell (4) is installed on one side of the driving main machine (3), a feeding mechanism 1 is installed at the upper end of the transfer shell (4), the lower end of the feeding mechanism 1 is connected to the inner cavity of the transfer shell (4), a spiral pusher (31) is installed on the inner side of the transfer shell (4), one end of the spiral pusher (31) is connected to the driving end of the driving main machine (3), a heating shell (7) is installed on the transfer shell (4) located outside the spiral pusher (31), an injection head (8) is installed at the end of the heating shell (7) away from the transfer shell (4), and the injection head (8) is connected to the inner side of the heating shell (7), characterized in that: The first material unloading mechanism comprises a raw material mixing bin (5), a connecting shell (51) is installed at the lower end of the raw material mixing bin (5), a primary mixing disc (52) is slidably arranged in the middle of the inner side of the connecting shell (51), the primary mixing disc (52) is adapted to the inner side of the connecting shell (51), one side of the primary mixing disc (52) movably penetrates the connecting shell (51) and is connected to a driving mechanism (9), a transfer column (53) is connected to the middle of the primary mixing disc (52), a heating element (55) is arranged on the transfer column (53) on the upper side of the primary mixing disc (52), and a heating element (55) is arranged on the transfer column (53) on the upper side of the primary mixing disc (52). The components (55) are provided with a plurality of groups. A secondary mixing disk (56) is rotatably mounted at the lower end of the transfer column (53). The secondary mixing disk (56) is provided with a plurality of material distribution holes (561). The middle portion of the transfer column (53) is in a threaded matching relationship with the primary mixing disk (52). The driving mechanism (9) drives the primary mixing disk (52) to move downward to extrude the raw materials to flow out from the material distribution holes (561). At the same time, the primary mixing disk (52) drives the transfer column (53) to rotate, thereby driving the spiral sheet (54), the heating component (55) and the secondary mixing disk (56) to rotate to mix the raw materials.

2. The extrusion molding equipment for PVC pipe production according to claim 1, characterized in that: The upper end of the transfer column (53) is rotatably connected to a support member (511) provided at the upper end of the inner side of the connecting shell (51). A spiral sheet (54) is installed on the transfer column (53) located at the lower side of the support member (511). The input end of the spiral sheet (54) corresponds to the output end of the raw material mixing bin (5). The rotation of the spiral sheet (54) can drive the raw materials to be transported downward.

3. The extrusion molding equipment for PVC pipe production according to claim 1, characterized in that: The heating element (55) is located between the spiral sheet (54) and the primary mixing disc (52), and the secondary mixing disc (56) is located at the lower side of the primary mixing disc (52).

4. The extrusion molding equipment for PVC pipe production according to claim 1, characterized in that: A thread groove (551) is provided in the middle of the transfer column (53), and a ball (521) is movably provided in the middle of the primary mixing disk (52), and the ball (521) matches the thread groove (551).

5. The extrusion molding equipment for PVC pipe production according to claim 1, characterized in that: The primary mixing disk (52) is provided with a plurality of guide holes (522), a blocking piece (524) is provided at the lower end of each guide hole (522), a connecting column (523) is fixedly mounted at the upper end of the blocking piece (524), and the upper end of the connecting column (523) is slidably connected to the primary mixing disk (52) and will not fall off the primary mixing disk (52) when sliding downward.

6. The extrusion molding equipment for PVC pipe production according to claim 1, characterized in that: The driving mechanism (9) comprises a connecting shell (91) and a servo motor (92) arranged in the middle of one side of the connecting shell (91); a driving end of the servo motor (92) passes through the connecting shell (91), and a driving gear (93) is installed at the driving end of the servo motor (92) located inside the connecting shell (91).

7. An extrusion molding device for producing PVC pipes as claimed in claim 6, characterized in that: One side of the connecting shell (91) is fixedly connected to a feeding mechanism 1, and one side of the driving gear (93) is meshed with a driven driving member 1 (94), which penetrates the connecting shell (51) and is fixedly connected to the primary mixing disk (52).

8. The extrusion molding equipment for producing PVC pipes according to claim 6, characterized in that: A second unloading mechanism (6) is disposed on the other side of the connecting shell (91). The unloading mechanism (1) and the second unloading mechanism (6) have the same structure. A driven driving member (94) and a driven driving member (95) are meshed on both sides of the driving gear (93). The driven driving member (94) and the second driven driving member (95) have the same structure. The servo motor (92) drives the driving gear (93) to rotate and then drives the driven driving member (94). The driven driving member (94) then drives the primary mixing disk (52) on the unloading mechanism (1) to move upward. At the same time, the driving gear (93) can drive the driven driving member (95) to drive the primary mixing disk (52) on the unloading mechanism (6) to move downward, thereby realizing preliminary mixing while realizing the alternate operation of the unloading mechanism (1) and the second unloading mechanism (6).

9. An extrusion molding device for producing PVC pipes as claimed in claim 7 or 8, characterized in that: The driven driving member (94) comprises a driven gear (941), the driven gear (941) is meshedly connected with the driving gear (93), one end of the driven gear (941) is rotationally connected with the connecting shell (91), and the other end of the driven gear (941) is fixedly provided with a driving gear (942), a reciprocating gear ring (943) is provided on the outer side of the driving gear (942), an extension rod (944) is fixedly installed on one side of the reciprocating gear ring (943), and one end of the extension rod (944) is fixedly connected with the primary mixing disk (52).

10. The extrusion molding equipment for producing PVC pipes according to claim 1, characterized in that: The outer side of the driving gear (942) is provided with a half-toothed reciprocating gear ring (943), the inner side of which meshes with the teeth on the outer side of the driving gear (942).

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