Processing technology of PVC stabilizer

Abstract

The application discloses a processing technology of PVC stabilizer, which comprises the following steps: ①stabilizer raw material screening and accurate batching, ②raw material pre-drying and moisture removal treatment, ③pre-dispersion and scattering treatment, ④constant temperature activation and modification treatment, and ⑤cooling, homogenization and curing treatment; a powder dispersion device is used in the pre-dispersion and scattering treatment process step of the PVC stabilizer, the powder dispersion device comprises a base, a feeding sleeve is arranged at the upper end of the base, the base is provided with a first through hole, the feeding sleeve is provided with a second through hole, and the powder dispersion device further comprises first wires, gaps are formed between the connected two first wires; the powder dispersion device further comprises second wires, the top position of the second wires is higher than the top position of the first wires, the bottom position of the second wires is higher than the top position of the first wires, and the second wires are located between the connected two first wires; and the powder dispersion device further comprises a stirring rod, the stirring rod moves through the bottom of the first wire and stirs the first wire to make the first wire vibrate. The application provides a processing technology of PVC stabilizer, and improves the dispersion efficiency.

Description

Technical Field

[0001] This invention relates to the field of powder dispersion equipment technology, and more specifically, to a processing technology for a PVC stabilizer. Background Technology

[0002] Calcium-zinc stabilizers are core environmentally friendly heat stabilizers in PVC product processing. They can replace traditional toxic lead salt stabilizers and are widely used in the production of various PVC products such as pipes, profiles, and transparent products. However, calcium-zinc stabilizers have limited compatibility with the PVC resin matrix. If dispersion is incomplete in the early stages, agglomerated stabilizer particles will form matrix foreign particles during subsequent mixing and plasticizing processes. This results in uneven stabilizer distribution in PVC products, causing not only appearance defects such as increased haze, surface flow marks, blooming, and uneven coloring, but also uneven plasticization, creating internal stress concentration points. This significantly reduces the mechanical and thermal stability of PVC products, and in severe cases, can lead to localized "zinc burning" and resin degradation, greatly affecting product qualification rates and production stability.

[0003] Currently, the pretreatment and dispersion methods for calcium-zinc stabilizers in the industry are relatively traditional, mostly employing fixed-pore-size filter screens and high-speed stirring. Fixed-pore-size filter screens cannot adjust their pore size, and can only filter large particle agglomerates, failing to break down fine powder clusters. High-speed stirring relies on mechanical shearing for dispersion, but the effective contact area between the stirring paddle and the powder is small, and the shearing action is concentrated in a localized area. Most of the powder is only subjected to simple agitation, resulting in very low overall shearing efficiency and poor dispersion consistency, leading to high energy consumption and low processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a processing technology for PVC stabilizers to improve dispersion efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a processing technology for a PVC stabilizer, comprising the following steps: ① screening and precise batching of stabilizer raw materials, ② pre-drying and dehumidification treatment of raw materials, ③ pre-dispersion and dispersion treatment, ④ constant temperature activation and modification treatment, and ⑤ cooling, homogenization, and maturation treatment; the pre-dispersion and dispersion treatment step of the PVC stabilizer uses a powder dispersion device, which includes a base, a feed sleeve fixedly installed at the upper end of the base, a first through hole on the base, and a second through hole on the feed sleeve, the second through hole being vertically connected to the first through hole, the upper end of the second through hole being the powder feeding end; it also includes a first filament. The first thread is arranged along the left-right direction, and multiple first threads are arranged parallel to each other, with a gap between two connected first threads; it also includes a second thread, which is arranged along the left-right direction, parallel to the first thread, with its top and bottom positions higher than the top positions of the first thread, and located between two connected first threads; it also includes a lever, which can move laterally along the direction perpendicular to the length of the first thread, and when the lever moves past the bottom of the first thread, it actuates the first thread to make it vibrate.

[0006] The invention is further configured such that the diameter of the first wire and the second wire is 0.3mm-0.4mm, and the spacing between the two connected first wires is 0.2mm-0.3mm.

[0007] The invention is further configured such that the base is provided with a first groove, the first groove being located on the left and right sides of the first through hole, and the two ends of the second wire passing through the first groove; it also includes a support seat, the support seat being located on the left and right sides of the base, the bottom of the second wire abutting against the upper end surface of the support seat, and the second wire being able to roll along the upper end surface of the support seat.

[0008] The invention is further configured to include a pressure seat, which is capable of moving up and down and can move laterally along the length direction perpendicular to the second thread. When the pressure seat is in the lower limit position, it presses the second thread downward. In this state, the pressure seat moves laterally to make the second thread roll back and forth along the upper end face of the support seat, thereby increasing or decreasing the gap between the second thread and the first thread.

[0009] The invention is further configured such that the maximum gap between adjacent first and second wires in the direction of the line connecting the centers is 0.35 mm.

[0010] The invention is further configured such that the second wire includes ends located at both ends, the ends being located on the side of the pressure seat away from the base, and the maximum distance between the pressure seat and the upper end face of the support seat is less than the diameter of the ends.

[0011] The invention is further configured such that a slide rail is installed at the upper end of the support base, and a movable block is slidably connected to the slide rail. The movable block can move laterally along the length direction perpendicular to the second thread. The movable block is slidably connected to a pressure seat, and the pressure seat can move up and down along the inner wall of the movable block.

[0012] The invention is further configured such that the movable block has a second groove, a limiting plate is fixedly installed on the upper part of the second groove, a baffle is slidably connected to the second groove, the baffle is located below the limiting plate, a spring is installed in the second groove, the upper and lower ends of the spring abut against the limiting plate and the baffle respectively, the pressure seat includes an extension sleeve located at the top, the upper end of the extension sleeve is fixedly connected to the baffle, a third groove is provided at the top of the extension sleeve, a movable rod is slidably connected to the third groove, the movable rod includes an extension part located at the bottom, the extension part can move up and down along the inner wall of the third groove, the movable rod passes through the limiting plate and the baffle and extends out of the upper end of the movable block, the movable rod can move up and down under the action of an external driving force, the width of the extension part is greater than the groove width through which the movable rod passes through the baffle, so that the extension part can abut against the baffle and drive the baffle to move upward.

[0013] The invention is further configured to include movable blocks, which are arranged in pairs and there are two pairs of movable blocks. The two pairs of movable blocks are located on the left and right sides of the base, respectively. The two movable blocks in a pair are located on the upper and lower sides of the second thread. Multiple limiting pieces are installed between the two movable blocks in a pair. The limiting pieces are located between two adjacent second threads. The movable blocks can move laterally along the length direction perpendicular to the second thread.

[0014] The invention is further configured such that a sliding plate is slidably connected to the bottom of the base, and a lever is installed at the upper end of the sliding plate. Under the action of an external driving force, the sliding plate can move laterally along the length direction perpendicular to the first wire.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. This invention employs a double-layered, staggered, parallel arrangement of first and second filaments to form a gradient dispersion gap. Combined with the high-frequency micro-vibration of the first filament, this generates a rapid impact-cutting effect, effectively cutting stabilizer agglomerates larger than 0.2mm. The filament gap can be dynamically adjusted to below 0.1mm, significantly improving the dispersion uniformity of PVC calcium-zinc stabilizer powder and preventing subsequent quality problems in PVC products caused by uneven stabilizer dispersion, such as uneven color, zinc burning, precipitation blooming, and excessive haze. Simultaneously, it greatly increases the effective contact range between the powder and the first and second filaments, improving dispersion efficiency.

[0017] 2. The present invention is configured with a correction structure consisting of a pair of moving blocks and an ultra-thin limiting plate, which can perform bidirectional precise correction of the offset second thread, ensuring that each second thread is accurately positioned in the middle of the two first threads. At the same time, the end limiting structure prevents the thread from falling off or misaligning, ensuring that the thread arrangement is neat and the dispersion gap is uniform throughout the process, avoiding the problem of decreased dispersion accuracy caused by thread offset after long-term operation, and significantly improving the stability of equipment operation and processing consistency. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of an embodiment;

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram showing the distribution of the first filament in the embodiment;

[0021] Figure 4 This is a diagram showing the positional relationship between the first wire and the lever in the embodiment;

[0022] Figure 5 This is a cross-sectional view of the first groove in the embodiment;

[0023] Figure 6 This is a schematic diagram showing the positional relationship between the limiting piece and the second thread in the embodiment.

[0024] Reference numerals: Base 1, First through hole 11, First groove 12, Groove 121, Pressure plate 13, Feed sleeve 2, Second through hole 21, First thread 3, Bending part 31, Second thread 4, End 41, Support seat 5, Moving module 51, Moving head 511, Slide rail 52, Moving block 6, Second groove 61, Limiting plate 62, Spring 63, Moving rod 64, Extension part 641, Pressure seat 65, Extension sleeve 651, Third groove 6511, Baffle 66, Moving block 7, Limiting piece 71, Sliding plate 8, Toggle lever 81. Detailed Implementation

[0025] 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, and 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.

[0026] like Figures 1-6 As shown, a processing technology for a PVC stabilizer includes the following steps:

[0027] ① Stabilizer raw material screening and precise formulation: Select the corresponding type of main stabilizer and auxiliary stabilizer according to the production formula and the adaptation requirements of PVC products. Commonly used main materials include calcium zinc composite stabilizer, zinc stearate, calcium stearate, organotin stabilizer, etc. Auxiliary materials include internal and external lubricants, antioxidants, chelating agents, dispersants and other supporting additives.

[0028] Before processing, all raw materials are screened and inspected to remove those that are damp, clumpy, deteriorated, or contain excessive impurities, thus preventing ineffective materials from affecting the stabilization effect. High-precision micro-electronic weighing equipment is used for accurate batching, strictly adhering to the formula ratio. The weighing error of trace additives is controlled within ≤±0.05%, and the error of the main stabilizer is ≤±0.1%, ensuring accurate formula proportions and avoiding problems such as yellowing, decomposition, and precipitation of PVC during processing due to imbalances. After weighing, the materials are classified and properly labeled for each batch.

[0029] ② Raw material pre-drying and dehumidification treatment: PVC stabilizer powder is highly susceptible to moisture absorption. Moisture-affected materials will clump together, become unevenly dispersed, and cause problems such as bubbles, precipitation, and surface defects in products during subsequent high-temperature processing. Therefore, a special pre-drying process is required after the ingredients are prepared, in which the proportioned stabilizer mixture is put into a low-temperature drying device.

[0030] Set the drying temperature to 45~60℃ and dry at a constant temperature for 15~25 minutes, turning the material at a low speed throughout the process to ensure uniform heating and thorough removal of adsorbed moisture from the powder. After drying, quickly seal and allow to cool down to prevent secondary moisture absorption. The moisture content of the dried material must be controlled below 0.1% to meet the standards for subsequent dispersion and activation processing.

[0031] ③ Pre-dispersion and agitation treatment: The core of this step is to break up powder agglomerates and achieve preliminary uniform mixing of the main and auxiliary stabilizers, laying the foundation for subsequent activation treatment.

[0032] ④ Isothermal activation modification treatment, using a segmented isothermal activation process: The first stage is low-temperature activation at 70~80℃, stirring for 3~5 minutes, allowing the modifier to fully coat the surface of the stabilizer particles; the second stage is medium-temperature activation at 90~105℃, with the speed increased to 400~500r / min, and continuous stirring for 8~12 minutes, thoroughly activating the active groups of the stabilizer, optimizing the surface characteristics of the powder, and improving its compatibility with PVC resin. Precise temperature control is maintained throughout the process; excessively high temperatures are strictly prohibited to prevent premature stabilizer failure or oxidation.

[0033] ⑤ Cooling, homogenization, and maturation treatment: After activation, the stabilizer material retains residual heat and is prone to secondary agglomeration and activity reduction at high temperatures. It needs to be immediately transferred to a closed cooling and mixing equipment for cooling and maturation. Continuous low-speed stirring and cooling are used to uniformly reduce the material temperature to room temperature (below 30℃). During the cooling process, continuous homogenization and stirring are carried out to ensure that the components of the material are evenly distributed and there is no local segregation.

[0034] After the material has cooled, let it stand for 10-15 minutes to further stabilize the activity of the additives, eliminate internal stress during processing, and stabilize the performance of the stabilizer to avoid performance fluctuations and uneven dispersion during subsequent use.

[0035] The PVC stabilizer is then cooled, homogenized, and matured before being granulated to produce large granules.

[0036] The pre-dispersion and agitation process of PVC stabilizer uses a powder dispersion device to disperse the stabilizer (PVC calcium zinc stabilizer) and reduce agglomeration.

[0037] like Figure 1 As shown, the dispersing device includes a base 1, and a feed sleeve 2 is fixedly installed on the upper end of the base 1. The base 1 is provided with a first through hole 11, which runs vertically through the base 1. The feed sleeve 2 is provided with a second through hole 21, which runs vertically through the feed sleeve 2. The second through hole 21 is connected vertically to the first through hole 11. The upper end of the second through hole 21 is the powder feeding end, and the lower end of the first through hole 11 is the powder discharging end.

[0038] Combination Figures 1-3 The dispersing device also includes first threads 3, which are arranged along the left-right direction. Multiple first threads 3 are arranged parallel to each other, with gaps between connected first threads 3. Specifically, the base 1 also has a first groove 12 located on the left and right sides of the first through hole 11, extending through the base 1. Both ends of the first threads 3 pass through the first groove 12. The ends of the first threads 3 protrude from the base 1 and are bent to form bends 31. A pressure plate 13 is fixedly installed on the base 1, pressing the bends 31 against the base 1 to keep the first threads 3 fixed. Simultaneously, the first groove 12 has a recess 121 into which the lower part of the first threads 3 is inserted, with the lower outer wall of the first threads 3 fitting against the wall of the recess 121, thus ensuring the stability of the first threads 3.

[0039] like Figure 1 , Figure 4As shown, the dispersing device also includes a lever 81, which can move laterally along the length direction perpendicular to the first wire 3. When the lever 81 moves past the bottom of the first wire 3, it actuates the first wire 3, causing the first wire 3 to vibrate. Specifically, a sliding plate 8 is slidably connected to the bottom of the base 1, and a lever 81 is installed at the upper end of the sliding plate 8. The sliding plate 8 is equipped with a driving device (cylinder or screw drive device) to move laterally along the length direction perpendicular to the first wire 3 under the action of external driving force. The upper end of the lever 81 is slightly higher than the bottom of the first wire 3, specifically by a distance of approximately 0.1mm-0.2mm. The diameter of the first wire 3 is 0.3mm-0.4mm, and the material of the first wire 3 is age-hardened beryllium bronze wire or tin-phosphor bronze. Its advantages are high elastic limit, resistance to stress relaxation, and resistance to permanent stretching after being repeatedly actuated hundreds of thousands of times. It also has a fast rebound speed and a long duration of free oscillation after each actuation.

[0040] like Figure 1 , Figure 2 As shown, the dispersing device also includes a second thread 4, the length direction of the second thread 4 is arranged in the left and right direction, the second thread 4 is parallel to the first thread 3, the top position of the second thread 4 is higher than the top position of the first thread 3, the bottom position of the second thread 4 is higher than the top position of the first thread 3, and the second thread 4 is located between two connected first threads 3.

[0041] like Figure 2As shown, the dispersing device also includes a support base 5, which is located on the left and right sides of the base 1. The bottom of the second thread 4 abuts against the upper surface of the support base 5, and the second thread 4 can roll along the upper surface of the support base 5. The distance by which the second thread 4 extends out of the side wall of the base 1 is greater than the distance by which the first thread 3 extends out of the side wall of the base 1. Specifically, a slide rail 52 is installed at the upper end of the support base 5, and a moving block 6 is slidably connected to the slide rail 52. A moving module 51 is installed at the upper end of the support base 5, and the moving module 51 includes a laterally moving moving head 511, which is fixedly connected to the moving block 6. The moving block 6 can move laterally along the length direction perpendicular to the second thread 4. A pressure seat 65 is slidably connected to the moving block 6, and the pressure seat 65 can move up and down along the inner wall of the moving block 6. When the pressure seat 65 is in its lower limit position, it presses the second filament 4 downwards. In this state, the pressure seat 65 moves laterally to make the second filament 4 roll back and forth along the upper surface of the support seat 5, thereby increasing or decreasing the gap between the second filament 4 and the first filament 3. The gap between the second filament 4 and the first filament 3 is used for the passage of powder. As the gap between the second filament 4 and the first filament 3 changes, the powder is loosened, allowing the powder to continue to be conveyed downwards. At the same time, the vibration of the first filament 3 cuts the agglomerated powder, improving the dispersion of the powder and facilitating subsequent mixing. The second wire 4 has the same diameter as the first wire 3. The maximum gap between adjacent first wires 3 and second wires 4 along the line connecting their centers is 0.35 mm. The distance between two connected first wires 3 is 0.2 mm to 0.3 mm. Due to the vibration of the first wire 3, the gap between the first wire 3 and the second wire 4 can be reduced to less than 0.1 mm. Therefore, it can greatly reduce the agglomeration of powder larger than 0.2 mm in the powder. The rapid impact caused by the vibration of the first wire 3 can break up the agglomerated powder. During the vibration of the first wire 3, the powder is ejected from both sides.

[0042] The movable block 6 is provided with a second groove 61. A limit plate 62 is fixedly installed on the upper part of the second groove 61. A baffle 66 is slidably connected to the second groove 61. The baffle 66 is located below the limit plate 62. A spring 63 is installed inside the second groove 61. The upper and lower ends of the spring 63 abut against the limit plate 62 and the baffle 66, respectively. The pressure seat 65 includes an extension sleeve 651 located at the top. The upper end of the extension sleeve 651 is fixedly connected to the baffle 66. A third groove 6511 is provided at the top of the extension sleeve 651. A sliding rod 64 is slidably connected to the third groove 6511. The sliding rod 64 includes an extension 641 located at the bottom. The extension 641 can move up and down along the inner wall of the third groove 6511. The sliding rod 64 passes through the limiting plate 62 and the baffle 66 and extends out of the upper end of the sliding block 6. The sliding rod 64 can move up and down under the action of an external driving force. The width of the extension 641 is greater than the width of the groove through which the sliding rod 64 passes in the baffle 66, so that when the extension 641 moves upward, it can abut against the baffle 66 and drive the baffle 66 to move upward. By moving the baffle 66, the clamping force of the pressure seat 65 on the second thread 4 is controlled. When the pressure seat 65 is slightly loosened from the second thread 4, the moving direction and position of the second thread 4 can be adjusted to compensate for the positional deviation caused by its rolling. Meanwhile, the second wire 4 includes end 41 located at both ends. The end 41 is located on the side of the pressure seat 65 away from the base 1. The maximum distance between the pressure seat 65 and the upper end face of the support seat 5 is less than the diameter of the end 41 to prevent the second wire 4 from detaching during position adjustment.

[0043] like Figure 2 , Figure 6 As shown, the specific adjustment structure includes movable blocks 7, which are arranged in pairs, with two pairs of movable blocks 7 located on the left and right sides of the base 1, respectively. The two pairs of movable blocks 7 are located on the upper and lower sides of the second thread 4. Multiple limiting plates 71 are installed between the pairs of movable blocks 7. The limiting plates 71 are sheet-like structures with a thickness of 0.1 mm, and their upper and lower ends are fixed to the upper and lower movable blocks 7. The movable blocks 7 are driven to move by a cylinder or screw drive device, enabling them to move laterally along the length direction perpendicular to the second thread 4, thereby causing the limiting plates 71 to move synchronously.

[0044] The limiting piece 71 is located between two adjacent second threads 4, such as Figure 6 As shown, the position of the limiting piece 71 roughly passes through the extension line of the axis of the first thread 3. When the position of the second thread 4 deviates from the adjustment, in Figure 6 In the indicated orientation, the left limiting piece 71 of one of the second threads 4 first pushes the second thread 4 to the initial position near the right limiting piece 71 (at this time, the right limiting piece 71 has left the position), and then pushes the second thread 4 back to the left through the right limiting piece 71, so that the second thread 4 moves to the middle position of the two first threads 3, completing the position correction. After the correction, the pressing seat 65 presses it tightly.

[0045] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A processing technology for a PVC stabilizer, characterized in that, The process includes the following steps: ① screening and precise formulation of stabilizer raw materials, ② pre-drying and dehumidification of raw materials, ③ pre-dispersion and dispersion treatment, ④ constant temperature activation and modification treatment, and ⑤ cooling, homogenization and maturation treatment. The pre-dispersion and dispersion process of PVC stabilizer uses a powder dispersion device. The powder dispersion device includes a base (1), the upper end of which is fixedly installed, and a feed sleeve (2). The base (1) is provided with a first through hole (11), and the feed sleeve (2) is provided with a second through hole (21). The second through hole (21) is connected vertically to the first through hole (11), and the upper end of the second through hole (21) is the powder feeding end. It also includes a first thread (3), the length direction of the first thread (3) is set along the left and right direction, there are multiple first threads (3) and they are set parallel to each other, and a gap is formed between two connected first threads (3); It also includes a second thread (4), the length direction of the second thread (4) is set along the left and right direction, the second thread (4) is parallel to the first thread (3), the top position of the second thread (4) is higher than the top position of the first thread (3), the bottom position of the second thread (4) is higher than the top position of the first thread (3), and the second thread (4) is located between two connected first threads (3); It also includes a lever (81) that can move laterally along the length direction perpendicular to the first thread (3). When the lever (81) moves past the bottom of the first thread (3), it actuates the first thread (3) to make the first thread (3) vibrate.

2. The processing technology of a PVC stabilizer according to claim 1, characterized in that, The diameter of the first wire (3) and the second wire (4) is 0.3mm-0.4mm, and the distance between two connected first wires (3) is 0.2mm-0.3mm.

3. The processing technology of a PVC stabilizer according to claim 1, characterized in that, The base (1) is also provided with a first groove (12), which is located on the left and right sides of the first through hole (11), and the two ends of the second wire (4) pass through the first groove (12). It also includes a support base (5), which is located on the left and right sides of the base (1). The bottom of the second thread (4) abuts against the upper surface of the support base (5), and the second thread (4) can roll along the upper surface of the support base (5).

4. The processing technology of a PVC stabilizer according to claim 3, characterized in that, It also includes a pressure seat (65), which can move up and down and can move laterally along the length direction perpendicular to the second thread (4). When the pressure seat (65) is in the lower limit position, it presses the second thread (4) downward. In this state, the pressure seat (65) moves laterally to make the second thread (4) roll back and forth along the upper end face of the support seat (5), thereby increasing or decreasing the gap between the second thread (4) and the first thread (3).

5. The processing technology of a PVC stabilizer according to claim 3, characterized in that, The maximum gap between adjacent first wire (3) and second wire (4) in the direction of the line connecting the centers is 0.35 mm.

6. The processing technology of a PVC stabilizer according to claim 4, characterized in that, The second wire (4) includes end portions (41) located at both ends, the end portions (41) being located on the side of the pressure seat (65) away from the base (1), and the maximum distance between the pressure seat (65) and the upper end face of the support seat (5) being less than the diameter of the end portions (41).

7. The processing technology of a PVC stabilizer according to claim 4, characterized in that, The upper end of the support base (5) is equipped with a slide rail (52), and the slide rail (52) is slidably connected to a moving block (6). The moving block (6) can move laterally along the length direction perpendicular to the second thread (4). The moving block (6) is slidably connected to the pressure seat (65), and the pressure seat (65) can move up and down along the inner wall of the moving block (6).

8. The processing technology of a PVC stabilizer according to claim 7, characterized in that, The movable block (6) is provided with a second groove (61), and a limiting plate (62) is fixedly installed on the upper part of the second groove (61). A baffle (66) is slidably connected to the second groove (61). The baffle (66) is located below the limiting plate (62). A spring (63) is installed in the second groove (61). The upper and lower ends of the spring (63) abut against the limiting plate (62) and the baffle (66) respectively. The pressure seat (65) includes an extension sleeve (651) located at the top. The upper end of the extension sleeve (651) is fixedly connected to the baffle (66). A third groove (6511) is provided at the top of the extension sleeve (651). The body (6511) is slidably connected to a movable rod (64), the movable rod (64) including an extension (641) located at the bottom, the extension (641) being able to move up and down along the inner wall of the third groove (6511), the movable rod (64) passing through the limiting plate (62) and the baffle (66) and extending out of the upper end of the movable block (6), the movable rod (64) being able to move up and down under the action of an external driving force, the width of the extension (641) being greater than the width of the groove through which the movable rod (64) passes through the baffle (66), so that the extension (641) moving upward can abut against the baffle (66) and drive the baffle (66) to move upward.

9. The processing technology of a PVC stabilizer according to claim 1, characterized in that, It also includes a movable block (7), which is arranged in pairs and there are two pairs of movable blocks (7). The two pairs of movable blocks (7) are located on the left and right sides of the base (1) respectively. The two movable blocks (7) in a pair are located on the upper and lower sides of the second thread (4). Multiple limiting pieces (71) are installed between the two movable blocks (7) in a pair. The limiting pieces (71) are located between two adjacent second threads (4). The movable block (7) can move laterally along the length direction perpendicular to the second thread (4).

10. The processing technology of a PVC stabilizer according to claim 1, characterized in that, The base (1) is slidably connected to a sliding plate (8), and the lever (81) is installed at the upper end of the sliding plate (8). Under the action of an external driving force, the sliding plate (8) can move laterally along the length direction perpendicular to the first thread (3).

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