Reaction kettle for producing and preparing PVC (polyvinyl chloride) heat stabilizer

Abstract

The invention provides a reaction kettle for production and preparation of a PVC (polyvinyl chloride) heat stabilizer, and relates to the technical field of production and preparation of PVC heat stabilizers. The top of the lower kettle body is fixedly connected with an upper kettle cover; a motor is fixedly mounted outside the top of the upper kettle cover; a rotating shaft is mounted in the lower kettle body; the top end of the rotating shaft is connected with a driving shaft of the motor; the bottom of the rotating shaft is connected with a lower connecting shaft, six parallel connecting rods are connected outside the rotating shaft in a surrounding manner, and the ends of the parallel connecting rods are connected with stirring teeth. The stirring teeth can be flexibly moved and adjusted, so that the spacing distance among the three stirring teeth is changed, the stirring efficiency of the stirring teeth can be fully exerted, and raw materials can be more efficiently and fully stirred and mixed. The problems that most of stirring teeth of an existing reaction kettle for producing and preparing the PVC heat stabilizer are of a fixed structural design and can only rotate at a set fixed position, and the overall stirring efficiency is greatly reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of the production and preparation of PVC heat stabilizers, and particularly relates to a reaction kettle for the production and preparation of PVC heat stabilizers. Background Art

[0002] Any additive that can improve the thermal stability of polymers is called a heat stabilizer; due to the poor thermal stability of polyvinyl chloride, the vast majority of PVC stabilizers in the world are used for polyvinyl chloride, so the commonly referred to PVC stabilizer usually means the heat stabilizer of polyvinyl chloride and its copolymers; PVC heat stabilizers are mainly used for PVC and other chlorine-containing polymers. PVC stabilizers are compounded from multiple components to form compound stabilizers, such as barium-cadmium stabilizers and barium-zinc stabilizers. There are many varieties of PVC stabilizers, which are available in powder, paste, and liquid forms, and a reaction kettle is required for processing.

[0003] For example, the Chinese patent "CN103406085B A Reaction Kettle" includes a lower kettle body, an upper kettle cover with a feed inlet is installed on the lower kettle body, a stirring device is provided on the upper kettle cover, the stirring device includes a stirring shaft and a stirring frame sleeved on the stirring shaft, the stirring frame is composed of an arc-shaped stirring rod and vertical stirring rods connected to both ends of the stirring rod, and between the two vertical stirring rods, there are multiple inclined stirring paddles, and the angle a between the plate surface of the stirring paddle and the horizontal plane is 55 degrees to 65 degrees; between the two vertical stirring rods of the stirring frame, there are multiple inclined stirring paddles, so that the materials in the reaction kettle can be fully stirred and mixed evenly.

[0004] At present, for the reaction kettles used in the production and preparation of existing PVC heat stabilizers, most of their stirring teeth adopt a fixed structure design, and the stirring teeth can only rotate at a fixed position. This design has advantages such as simple structure, reliable operation, and easy maintenance. However, in actual production scenarios, it has become a bottleneck restricting the stirring effect. Since the positions of the stirring teeth are fixed, it is difficult for the materials to be fully and evenly mixed during the stirring process, resulting in a significant increase in the time-consuming of the stirring process, a great reduction in the overall stirring efficiency, and inevitably an extension of the production and preparation cycle of PVC heat stabilizers. Summary of the Invention

[0005] The present invention relates to a reaction kettle for the production and preparation of PVC heat stabilizers, which can flexibly move and adjust the stirring teeth, thereby changing the spacing between the three stirring teeth. By adjusting the specific positions of the stirring teeth, the stirring efficiency of the stirring teeth can be fully exerted, and more efficient and sufficient stirring and mixing of the raw materials can be achieved, which helps to significantly accelerate the reaction rate of the raw materials, and thus greatly shorten the operation cycle of the production and preparation of PVC heat stabilizers and improve the overall production efficiency.

[0006] In the first aspect of the present invention, a reaction kettle for the production and preparation of PVC heat stabilizer is provided, which specifically includes: a lower kettle body, an upper kettle cover, a motor, a rotating shaft, a lower connecting shaft, parallel connecting rods, stirring teeth, a transmission support rod, a lifting force-bearing frame, and a mixing frame; the upper kettle cover is fixedly connected to the top of the lower kettle body, and a motor is fixedly installed outside the top of the upper kettle cover; a rotating shaft is installed inside the lower kettle body, and the top end of the rotating shaft is connected to the driving shaft of the motor; the bottom of the rotating shaft is connected to the lower connecting shaft, and six parallel connecting rods are circumferentially connected to the outside of the rotating shaft, and the stirring teeth are connected to the ends of the parallel connecting rods; three transmission support rods are circumferentially connected to the outside of the lower connecting shaft, and the transmission support rods are connected to the stirring teeth; a lifting force-bearing frame is sleeved outside the rotating shaft, the end of the lifting force-bearing frame is in contact with the inner wall of the lower kettle body, and the top of the lower connecting shaft is connected to the lifting force-bearing frame; a mixing frame is installed inside the bottom of the lower kettle body, and the mixing frame is connected to the bottom of the rotating shaft.

[0007] Further, the stirring teeth are circumferentially distributed inside the lower kettle body. One end of the parallel connecting rod is rotatably connected to the rotating shaft, and the other end of the parallel connecting rod is rotatably connected to the stirring teeth. The rotating shaft is connected to three stirring teeth through the parallel connecting rods, and the stirring teeth can be moved and adjusted to change the distance between the three stirring teeth. By changing the position of the stirring teeth, the raw materials can be more efficiently stirred and mixed by the stirring teeth.

[0008] Further, the bottom of the rotating shaft is hollow, the top of the lower connecting shaft is slidably connected inside the bottom of the rotating shaft, guide sliding holes are symmetrically arranged outside the rotating shaft, sliders are symmetrically arranged at the top end of the lower connecting shaft, and the sliders are slidably connected inside the guide sliding holes provided on the rotating shaft. Through the sliding fit of the sliders and the guide sliding holes, the up and down movement of the lower connecting shaft is guided.

[0009] Further, one end of the transmission support rod is rotatably connected to the lower connecting shaft, and the other end of the transmission support rod is rotatably connected to the stirring teeth. The lower connecting shaft is connected to three stirring teeth through the transmission support rods. The motor drives the rotating shaft and the lower connecting shaft to rotate synchronously, and the rotating shaft and the lower connecting shaft drive the stirring teeth to operate through the parallel connecting rods and the transmission support rods, and the raw materials inside the lower kettle body are mixed by the stirring teeth.

[0010] Further, a support ring is arranged inside the lower kettle body, the support ring is bent up and down, both ends of the lifting force-bearing frame are in contact with the top side of the support ring, connecting grooves are symmetrically arranged inside the lifting force-bearing frame, and the ends of the sliders are inserted into the connecting grooves provided on the lifting force-bearing frame.

[0011] Further, a spring is sleeved outside the lower connecting shaft, the bottom end of the spring is in contact with the lower connecting shaft, and the top end of the spring is in contact with the bottom of the rotating shaft.

[0012] Further, when the lifting force-bearing frame drives the lower connecting shaft to move upward, the spring is stressed and contracts, and the distance between the three stirring teeth increases. When the spring pushes the lower connecting shaft to move downward, the distance between the three stirring teeth decreases. The lower connecting shaft drives the lifting force-bearing frame to rotate synchronously. When the end of the lifting force-bearing frame contacts the upward inclined surface of the support ring, the support ring pushes the lifting force-bearing frame to move upward, and the lifting force-bearing frame then drives the lower connecting shaft to move upward synchronously. The spring is gradually stressed and contracts. The lower connecting shaft drives the transmission strut to rotate outward, and the transmission strut drives the stirring teeth to move outward, increasing the distance between the three stirring teeth.

[0013] Further, the mixing frame is rotationally connected to the lower kettle body. A spline shaft is provided at the center of the mixing frame, and a spline groove is provided at the bottom of the lower connecting shaft. The spline shaft is slidably connected to the spline groove provided on the lower connecting shaft. The lower connecting shaft drives the mixing frame to rotate, and the raw materials are assisted in stirring and mixing through the mixing frame.

[0014] The present invention provides a reaction kettle for the production and preparation of PVC heat stabilizers, having the following beneficial effects: When the present invention is in use, flexible movement adjustment operations can be performed on the stirring teeth, thereby changing the distance between the three stirring teeth. By adjusting the specific position of the stirring teeth, the stirring efficiency of the stirring teeth can be fully exerted, realizing more efficient and sufficient stirring and mixing of the raw materials, helping to significantly accelerate the reaction rate of the raw materials, and then greatly shortening the operation cycle of the production and preparation of PVC heat stabilizers, and improving the overall production efficiency; the sliding fit structure formed by the slider and the guiding sliding hole provides a guiding effect for the up and down movement of the lower connecting shaft, and at the same time strictly limits the movement stroke of the lower connecting shaft; the motor drives the rotating shaft and the lower connecting shaft to operate synchronously. The rotating shaft and the lower connecting shaft drive the stirring teeth to perform regular movements with the synergistic effect of the parallel connecting rod and the transmission strut. The stirring teeth continuously operate inside the lower kettle body, efficiently mixing the raw materials, promoting the full blending of the raw materials and causing chemical reactions.

[0015] In addition, during the operation of the stirring teeth driven by the motor, the lower coupling shaft drives the lifting force-bearing frame to rotate synchronously; when the end of the lifting force-bearing frame contacts the upward inclined surface of the support ring, the support ring exerts an upward thrust on the lifting force-bearing frame, prompting it to move upward. This movement drives the lower coupling shaft to move upward synchronously, causing the spring to be gradually stressed and contract. The lower coupling shaft drives the transmission strut to rotate outward, and then the stirring teeth move outward, thereby increasing the spacing between the three stirring teeth; when the end of the lifting force-bearing frame contacts the downward inclined surface of the support ring, the spring begins to release the elastic force accumulated before, pushing the lower coupling shaft to move downward step by step. The movement of the lower coupling shaft drives the lifting force-bearing frame to move downward synchronously, ensuring that the end of the lifting force-bearing frame always remains in close contact with the support ring. The lower coupling shaft drives the transmission strut to rotate inward, and the transmission strut drives the stirring teeth to move inward, thereby reducing the spacing between the three stirring teeth; through the above process, the reciprocating position adjustment of the stirring teeth during rotation is realized, ensuring excellent and stable stirring effect during the production and preparation of PVC heat stabilizer.

[0016] In addition, the lower coupling shaft drives the mixing frame to rotate, and the raw materials are assisted in stirring and mixing by means of the mixing frame, thereby further accelerating the reaction rate of the raw materials; the spline shaft and the spline groove adopt a sliding fit design method. When the lower coupling shaft moves up and down reciprocally, it can still ensure that the mixing frame rotates synchronously and stably, effectively guaranteeing the continuity of the operation of the mixing frame.

[0017] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0019] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0020] In the drawings: Figure 1 The overall axonometric structural schematic diagram of the reaction kettle for the production and preparation of PVC heat stabilizer of the present application is shown; Figure 2 The overall sectional structural schematic diagram of the reaction kettle for the production and preparation of PVC heat stabilizer of the present application is shown; Figure 3 The overall axonometric structural schematic diagram of the lower kettle body of the reaction kettle for the production and preparation of PVC heat stabilizer of the present application is shown; Figure 4The schematic diagram of the connection structure of the rotating shaft, lower connecting shaft, parallel connecting rod, stirring teeth, transmission strut, lifting stress-bearing frame and spring of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown; Figure 5 The schematic diagram of the connection structure of the rotating shaft and the lower connecting shaft of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown; Figure 6 The schematic diagram of the split structure of the rotating shaft and the lower connecting shaft of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown; Figure 7 The schematic diagram of the connection structure of the parallel connecting rod, stirring teeth and transmission strut of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown; Figure 8 The axonometric structure diagram of the lifting stress-bearing frame of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown; Figure 9 The axonometric structure diagram of the mixing frame of the reaction kettle for the production of PVC heat stabilizer according to the present application is shown.

[0021] Reference signs: 1, lower kettle body; 101, support ring; 2, upper kettle cover; 3, motor; 4, rotating shaft; 401, guiding sliding hole; 5, lower connecting shaft; 501, slider; 502, spline groove; 6, parallel connecting rod; 7, stirring teeth; 8, transmission strut; 9, lifting stress-bearing frame; 901, connecting groove; 10, spring; 11, mixing frame; 1101, spline shaft. Detailed implementation manners

[0022] In order 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 drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 9 : Embodiment 1: The present invention provides a reactor for the production and preparation of PVC heat stabilizers, comprising: a lower kettle body 1, an upper kettle cover 2, a motor 3, a rotating shaft 4, a lower coupling shaft 5, parallel connecting rods 6, stirring teeth 7, transmission support rods 8, a lifting stress-bearing frame 9 and a mixing frame 11; the top of the lower kettle body 1 is fixedly connected to the upper kettle cover 2, and the motor 3 is fixedly installed outside the top of the upper kettle cover 2; the rotating shaft 4 is installed inside the lower kettle body 1, and the top end of the rotating shaft 4 is connected to the driving shaft of the motor 3; the bottom of the rotating shaft 4 is connected to the lower coupling shaft 5, six parallel connecting rods 6 are circumferentially connected to the outside of the rotating shaft 4, and the ends of the parallel connecting rods 6 are connected to the stirring teeth 7; three transmission support rods 8 are circumferentially connected to the outside of the lower coupling shaft 5, and the transmission support rods 8 are connected to the stirring teeth 7; a lifting stress-bearing frame 9 is sleeved on the outside of the rotating shaft 4, the end of the lifting stress-bearing frame 9 is in contact with the inner wall of the lower kettle body 1, and the top of the lower coupling shaft 5 is connected to the lifting stress-bearing frame 9; the mixing frame 11 is installed inside the bottom of the lower kettle body 1, and the mixing frame 11 is connected to the bottom of the rotating shaft 4; the stirring teeth 7 are circumferentially distributed inside the lower kettle body 1, one end of the parallel connecting rod 6 is rotatably connected to the rotating shaft 4, the other end of the parallel connecting rod 6 is rotatably connected to the stirring teeth 7, and the rotating shaft 4 is connected to the three stirring teeth 7 through the parallel connecting rod 6; the stirring teeth 7 can be moved and adjusted to change the interval distance between the three stirring teeth 7. By changing the position of the stirring teeth 7, the raw materials can be more efficiently stirred and mixed by the stirring teeth 7, the reaction rate of the raw materials can be increased, and the production and preparation operation of PVC heat stabilizers can be realized faster.

[0024] In this embodiment, the bottom of the rotating shaft 4 is hollow, the top of the lower coupling shaft 5 is slidably connected inside the bottom of the rotating shaft 4, guiding sliding holes 401 are symmetrically arranged on the outside of the rotating shaft 4, sliding blocks 501 are symmetrically arranged at the top end of the lower coupling shaft 5, and the sliding blocks 501 are slidably connected inside the guiding sliding holes 401 provided on the rotating shaft 4; Adopting the above technical solution, through the sliding fit of the sliding block 501 and the guiding sliding hole 401, the up and down movement of the lower coupling shaft 5 is guided, and the movement stroke of the lower coupling shaft 5 is limited.

[0025] In this embodiment, one end of the transmission support rod 8 is rotatably connected to the lower coupling shaft 5, the other end of the transmission support rod 8 is rotatably connected to the stirring tooth 7, and the lower coupling shaft 5 is connected to the three stirring teeth 7 through the transmission support rod 8; Adopting the above technical solution, the motor 3 drives the rotating shaft 4 and the lower coupling shaft 5 to rotate synchronously. The rotating shaft 4 and the lower coupling shaft 5 drive the stirring teeth 7 to operate through the parallel connecting rod 6 and the transmission support rod 8, and the raw materials inside the lower kettle body 1 are mixed by the stirring teeth 7, so that the raw materials are fully fused and react.

[0026] In this embodiment, a support ring 101 is arranged inside the lower kettle body 1. The support ring 101 is bent up and down. Both ends of the lifting force-bearing frame 9 are in contact with the top side of the support ring 101. Connecting grooves 901 are symmetrically arranged inside the lifting force-bearing frame 9. The end of the slider 501 is inserted into the connecting groove 901 provided in the lifting force-bearing frame 9. A spring 10 is sleeved outside the lower connecting shaft 5. The bottom end of the spring 10 is in contact with the lower connecting shaft 5, and the top end of the spring 10 is in contact with the bottom of the rotating shaft 4. When the lifting force-bearing frame 9 drives the lower connecting shaft 5 to move upward, the spring 10 is stressed and contracts, and the distance between the three stirring teeth 7 increases. When the spring 10 pushes the lower connecting shaft 5 to move downward, the distance between the three stirring teeth 7 decreases. Adopting the above technical solution, during the operation of the stirring teeth 7 driven by the motor 3, the lower connecting shaft 5 drives the lifting force-bearing frame 9 to rotate synchronously; when the end of the lifting force-bearing frame 9 contacts the upward inclined surface of the support ring 101, the support ring 101 pushes the lifting force-bearing frame 9 to move upward, and the lifting force-bearing frame 9 further drives the lower connecting shaft 5 to move upward synchronously. The spring 10 is gradually stressed and contracts. The lower connecting shaft 5 drives the transmission support rod 8 to rotate outward, and the transmission support rod 8 drives the stirring teeth 7 to move outward, increasing the distance between the three stirring teeth 7; when the end of the lifting force-bearing frame 9 contacts the downward inclined surface of the support ring 101, the spring 10 releases the accumulated force, drives the lower connecting shaft 5 to move downward gradually through the spring 10, the lower connecting shaft 5 drives the lifting force-bearing frame 9 to move synchronously, so that the end of the lifting force-bearing frame 9 is always in close contact with the support ring 101, the lower connecting shaft 5 drives the transmission support rod 8 to rotate inward, and the transmission support rod 8 drives the stirring teeth 7 to move inward, reducing the distance between the three stirring teeth 7; realizing the reciprocating adjustment effect on the position during the rotation of the stirring teeth 7, and ensuring the excellent use effect in the production and preparation of PVC heat stabilizer.

[0027] Embodiment 2, on the basis of Embodiment 1, the mixing frame 11 is rotatably connected to the lower kettle body 1. A spline shaft 1101 is arranged at the central part of the mixing frame 11, and a spline groove 502 is arranged at the bottom of the lower connecting shaft 5. The spline shaft 1101 is slidably connected to the spline groove 502 provided in the lower connecting shaft 5. Adopting the above technical solution, the lower connecting shaft 5 drives the mixing frame 11 to rotate, and the raw materials are assisted in stirring and mixing through the mixing frame 11, further improving the reaction rate of the raw materials. And through the sliding fit of the spline shaft 1101 and the spline groove 502, during the up and down reciprocating movement of the lower connecting shaft 5, the mixing frame 11 can still be driven to rotate synchronously, ensuring the continuity of the operation of the mixing frame 11.

[0028] Working principle of this embodiment: The motor 3 drives the rotating shaft 4 and the lower coupling shaft 5 to rotate synchronously. The rotating shaft 4 and the lower coupling shaft 5 drive the stirring teeth 7 to operate through the parallel connecting rod 6 and the transmission support rod 8, and the stirring teeth 7 are used to mix the raw materials inside the lower kettle body 1, so that the raw materials are fully fused and react; during the operation of the motor 3 driving the stirring teeth 7, the lower coupling shaft 5 drives the lifting force-bearing frame 9 to rotate synchronously; when the end of the lifting force-bearing frame 9 contacts the upward inclined surface of the support ring 101, the support ring 101 pushes the lifting force-bearing frame 9 to move upward, and the lifting force-bearing frame 9 then drives the lower coupling shaft 5 to move upward synchronously, and the spring 10 is gradually stressed and contracted. The lower coupling shaft 5 drives the transmission support rod 8 to rotate outward, and the transmission support rod 8 drives the stirring teeth 7 to move outward, increasing the interval distance between the three stirring teeth 7; when the end of the lifting force-bearing frame 9 contacts the downward inclined surface of the support ring 101, the spring 10 releases the accumulated force, drives the lower coupling shaft 5 to move downward gradually through the spring 10, and the lower coupling shaft 5 drives the lifting force-bearing frame 9 to move synchronously, so that the end of the lifting force-bearing frame 9 is always in close contact with the support ring 101. The lower coupling shaft 5 drives the transmission support rod 8 to rotate inward, and the transmission support rod 8 drives the stirring teeth 7 to move inward, reducing the interval distance between the three stirring teeth 7; during the rotation of the stirring teeth 7, the reciprocating adjustment effect of the position is achieved. By changing the position of the stirring teeth 7, the raw materials can be stirred and mixed more efficiently through the stirring teeth 7, increasing the reaction rate of the raw materials, and realizing the production and preparation operation of PVC heat stabilizer faster; the lower coupling shaft 5 drives the mixing frame 11 to rotate, and the raw materials are assisted in stirring and mixing through the mixing frame 11, further improving the reaction rate of the raw materials.

[0029] In this article, the following points need to be noted: 1. The attached drawings of the embodiments of the present invention only relate to the structures involved in the embodiments of the present invention, and other structures can refer to the general design.

[0030] 2. Without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0031] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A reaction kettle for the production and preparation of a PVC heat stabilizer, comprising: Lower kettle body (1), upper kettle cover (2), motor (3), rotating shaft (4), lower coupling shaft (5), parallel connecting rod (6), stirring teeth (7), transmission support rod (8), lifting force-bearing frame (9) and mixing frame (11); it is characterized in that a upper kettle cover (2) is fixedly connected to the top of the lower kettle body (1), and a motor (3) is fixedly installed outside the top of the upper kettle cover (2); a rotating shaft (4) is installed inside the lower kettle body (1), and the top end of the rotating shaft (4) is connected to the driving shaft of the motor (3); the bottom of the rotating shaft (4) is connected with a lower coupling shaft (5), six parallel connecting rods (6) are circumferentially connected outside the rotating shaft (4), and the end of the parallel connecting rod (6) is connected with stirring teeth (7); three transmission support rods (8) are circumferentially connected outside the lower coupling shaft (5), and the transmission support rod (8) is connected with the stirring teeth (7); a lifting force-bearing frame (9) is sleeved outside the rotating shaft (4), the end of the lifting force-bearing frame (9) is in contact with the inner wall of the lower kettle body (1), and the top of the lower coupling shaft (5) is connected with the lifting force-bearing frame (9); a mixing frame (11) is installed inside the bottom of the lower kettle body (1), and the mixing frame (11) is connected with the bottom of the rotating shaft (4).

2. The reaction kettle for producing and preparing PVC heat stabilizer according to claim 1, characterized in that the stirring teeth (7) are circumferentially distributed in the lower kettle body (1), one end of the parallel connecting rod (6) is rotatably connected to the rotating shaft (4), the other end of the parallel connecting rod (6) is rotatably connected to the stirring teeth (7), and the rotating shaft (4) is connected to three stirring teeth (7) through the parallel connecting rod (6).

3. The reaction kettle for producing and preparing PVC heat stabilizer according to claim 2, characterized in that the bottom of the rotating shaft (4) is hollow, the top of the lower coupling shaft (5) is slidably connected inside the bottom of the rotating shaft (4), guiding sliding holes (401) are symmetrically arranged outside the rotating shaft (4), sliding blocks (501) are symmetrically arranged at the top end of the lower coupling shaft (5), and the sliding blocks (501) are slidably connected inside the guiding sliding holes (401) provided on the rotating shaft (4).

4. The reaction kettle for producing and preparing PVC heat stabilizer according to claim 3, characterized in that one end of the transmission support rod (8) is rotatably connected to the lower coupling shaft (5), the other end of the transmission support rod (8) is rotatably connected to the stirring teeth (7), and the lower coupling shaft (5) is connected to three stirring teeth (7) through the transmission support rod (8).

5. The reaction kettle for producing and preparing PVC heat stabilizer according to claim 3, characterized in that a support ring (101) is arranged on the inner side of the lower kettle body (1), the support ring (101) is bent up and down, both ends of the lifting force-bearing frame (9) are in contact with the top side of the support ring (101), connecting grooves (901) are symmetrically arranged inside the lifting force-bearing frame (9), and the end of the sliding block (501) is inserted into the connecting groove (901) provided on the lifting force-bearing frame (9).

6. The reaction kettle for producing and preparing PVC heat stabilizer according to claim 3, characterized in that A spring (10) is sleeved outside the lower coupling shaft (5). The bottom end of the spring (10) contacts the lower coupling shaft (5), and the top end of the spring (10) contacts the bottom of the rotating shaft (4).

7. A reactor for the production and preparation of PVC heat stabilizer according to claim 6, characterized in that When the lifting force-bearing frame (9) drives the lower coupling shaft (5) to move upward, the spring (10) is stressed and contracts, and the distance between the three stirring teeth (7) increases. When the spring (10) pushes the lower coupling shaft (5) to move downward, the distance between the three stirring teeth (7) decreases.

8. A reactor for the production and preparation of PVC heat stabilizer according to claim 1, characterized in that The mixing frame (11) is rotatably connected to the lower reactor body (1). A spline shaft (1101) is provided at the central part of the mixing frame (11), and a spline groove (502) is provided at the bottom of the lower coupling shaft (5). The spline shaft (1101) is slidably connected to the spline groove (502) provided on the lower coupling shaft (5).

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