Polymerizing kettle for producing low-polymerization-degree PVC (Polyvinyl Chloride) resin

Abstract

The invention discloses a polymerization kettle for producing low-polymerization-degree PVC (Polyvinyl Chloride) resin. The polymerization kettle comprises a mounting bracket, raw materials are transversely stirred and can also be vertically stirred through the stirring assembly, a stirring rod drives a mounting plate to transversely stir, then a pull rod pulls the mounting plate below to vertically move through the magnetic adsorption effect of an electric control magnet and a magnetic adsorption block, and the raw materials are uniformly stirred. Meanwhile, a short pull rod pulls an upper mounting plate to move vertically, so that the raw materials are stirred and mixed more uniformly; the shifting plate rotates on the outer wall of the hinge, so that the shifting plate can also swing in the raw materials, and the practicability is better; the raw materials are heated while being stirred through the heating plate, meanwhile, the servo motor pulls the sliding rod to move in the inner cavity of the limiting arc groove through the connecting piece, and then the position of the heating rod is adjusted, so that the temperature difference in the raw materials is smaller, and the heat transfer efficiency of raw material heating is better.

Description

Technical Field

[0001] The invention relates to the technical field of processing equipment, in particular to a polymerization kettle for producing low-polymerization degree PVC resin. Background Art

[0002] Low-polymerization PVC resin refers to a resin with an average polymerization degree of ≤700, and ultra-low-polymerization PVC resin refers to a high-porosity special resin with an average polymerization degree of less than 600 and a viscosity number of less than 72ml / g. This type of resin has the advantages of small relative molecular mass, high apparent density, low melting and gelation temperature, low melt viscosity, good transparency, short plasticization time, and excellent processing performance. During the processing, less or no plasticizer can be added, and there will be no phenomenon of accelerated product aging due to plasticizer migration. This resin has excellent compatibility and intramolecular plasticization with other polymer materials. The products have high transparency, smooth surface, high thermal stability, and good flame retardant properties. It is a PVC resin with large dosage and wide application. It can be used alone for injection molding of various pipes and extrusion profiles and sheets, and can also be blended and modified with other resins to prepare special materials with various properties. It can also partially replace engineering plastics such as ABS and AS for electrical accessories, or replace polyester to produce transparent materials, and replace chloroacetic acid copolymer resin for electroacoustic equipment, inks and high-filled floors. In the existing production process of low-polymerization degree PVC resin, most polymerization kettles are equipped with a jacket structure so that heating or cooling can be achieved by introducing steam or cold water. However, since the jacket is located on the outer wall of the polymerization kettle, this design will form a temperature difference from the inside to the outside of the polymerization kettle when the temperature is adjusted, thereby affecting the heat transfer efficiency between the materials. Especially in the mixing process, how to ensure effective heat transfer between the materials while maintaining the low polymerization degree of the resin; When raw materials are added to an existing low-polymerization degree PVC resin polymerization kettle for stirring, the added materials will accumulate on the top or settle to the bottom, which makes it impossible to mix the raw materials efficiently and evenly. This situation puts forward higher requirements for optimizing the formula of the polymerization dispersant, adjusting the composite dispersant to achieve the best usage ratio, and ensuring the dispersion effect of the polymerization system, thereby ensuring the stability of key indicators such as the morphology, apparent density, and porosity of the PVC resin particles. Summary of the invention

[0003] The present invention provides a polymerization kettle for producing low-polymerization degree PVC resin to solve the above problems.

[0004] To achieve the above object, the present invention provides the following technical solutions: A polymerization kettle for producing low-polymerization degree PVC resin, comprising a mounting bracket, a control cabinet is mounted on the outer wall of the mounting bracket, a jacket is mounted on the inner wall of the mounting bracket, and a kettle body is mounted on the inner wall of the jacket, a heat-saturating component is mounted on the outer wall of the kettle body, an upper plate is mounted at the port of the kettle body, an isolation tank is mounted on the top of the upper plate through a fixed bracket, and a stirring component is mounted on one side of the fixed bracket and on the outer wall of the upper plate; The stirring assembly comprises a fixed shell and a limiting shell, the fixed shell is installed on the outer wall of the upper plate, the cross-section of the fixed shell is a concave structure, a stirring motor is installed on the outer wall of the fixed shell through bolts, the driving shaft of the stirring motor sequentially passes through the fixed shell and the upper plate, and one end of the driving shaft of the stirring motor extends to the inner cavity of the kettle body and is provided with a connecting sleeve, the connecting sleeve is a semicircular structure and is provided with two groups, and the connecting sleeves are fixed by bolts, a stirring rod is installed on the inner wall of the connecting sleeve, a limiting slide groove is provided on the outer wall of the stirring rod, a limiting block is installed on the inner wall of the limiting slide groove, a fixed block is slidably connected to one side of the limiting block and is located on the outer wall of the stirring rod, the fixed block is provided with two groups and is respectively arranged on the outer wall of the stirring rod from top to bottom, wherein the limiting block is slidably connected to the inner wall of the fixing block for lateral limitation, and the outer wall of the fixing block A mounting plate is installed in a circular array, and the mounting plate is inclined 45 degrees relative to the top surface of the fixed block. A limiting sleeve is installed on the outer wall of the mounting plate, and a pull rod is slidably connected to the inner wall of the limiting sleeve. A magnetic adsorption block is arranged at one end of the pull rod, and the pull rods are grouped in pairs, and the length of one group pulling the upper fixed block is longer than the length of the other group pulling the lower fixed block, and the length is 3-5cm. A hinge is installed on the outer wall of the mounting plate through bolts, and a paddle is installed at one end of the hinge. The limiting shell is provided with multiple groups symmetrically arranged on the inner wall of the upper plate, and the limiting shell is located at the inner cavity port of the kettle body. An electro-controlled magnet is arranged on the inner wall of the limiting shell, and the limiting shell is located directly above the pull rod and there is a gap between the limiting shell and the pull rod, and the electro-controlled magnet magnetically adsorbs the magnetic adsorption block. A limiting ring is arranged on one side of the fixed block and at the bottom of the stirring rod.

[0005] As a preferred solution of the present invention, a high-precision temperature sensor is embedded in the outer wall of the mounting plate, and a heating plate is embedded in one side of the high-precision temperature sensor and located on the outer wall of the mounting plate.

[0006] As a preferred solution of the present invention, baffles are installed on the opposite side walls of the upper plate through hinges, wherein a handle is installed on the outer wall of the baffle, and the baffle and the upper plate cooperate with each other to seal the port of the kettle body, and a connecting valve is installed on the base surface of the upper plate through a conduit.

[0007] As a preferred solution of the present invention, the connecting valve is located on one side of the stirring assembly, a liquid pump is installed on the outer wall of the mounting bracket, and a liquid outlet valve is installed at the bottom of the kettle body through a conduit.

[0008] As a preferred solution of the present invention, the heat equalization assembly includes a limit bracket and a mounting base plate, the limit bracket is installed at the bottom of the kettle body, a servo motor is installed on the outer wall of the limit bracket, and the drive shaft of the servo motor passes through the kettle body and extends to the inner cavity of the kettle body where a rotating disk is installed.

[0009] As a preferred solution of the present invention, spherical rotating joints are installed in an equidistant array on the outer wall of the rotating disk, and the spherical rotating joints are in an annular structure. A connecting plate is installed on the outer wall of the spherical rotating joint.

[0010] As a preferred solution of the present invention, the mounting substrate is provided with two groups and is symmetrically installed at the opposite inner cavity ports of the kettle body, and the outer wall of the mounting substrate is provided with limiting arc grooves in a circular array, wherein a sliding rod is slidably connected to the inner wall of the limiting arc groove, and a mounting shell is installed between the opposite sliding rods.

[0011] As a preferred solution of the present invention, a heating rod is embedded in the outer wall of the mounting shell, and a temperature device is installed on the outer wall of the mounting shell, wherein the sliding rod at the bottom of the inner cavity of the kettle body is provided with a spherical rotating joint 2, and a connecting plate is connected to the outer wall of the spherical rotating joint 2, and the control cabinet is respectively connected to the servo motor, the heating rod, the temperature device, the stirring motor, the electric controlled magnet, the high-precision temperature sensor and the liquid pump through wires, and the connection method is electrical connection.

[0012] The present invention can achieve that when the device stirs the raw materials by arranging a stirring component in a polymerization kettle for producing low-polymerization-degree PVC resin, the stirring component can stir the raw materials horizontally and can also be moved vertically. The stirring rod drives the mounting plate to stir horizontally, and then the pull rod is subjected to the magnetic adsorption effect of the electric-controlled magnet and the magnetic adsorption block. The longer pull rod pulls the lower mounting plate to move vertically, and the shorter pull rod pulls the upper mounting plate to move vertically, so that the raw materials are stirred more fully and the raw materials are mixed more evenly.

[0013] The present invention can achieve that when the device stirs the raw materials by setting a stirring component, the paddle is rotated on the outer wall of the hinge, and the paddle will also swing in the raw materials, so that the stirring effect of the raw materials is better, thereby solving the problem that the raw materials cannot be mixed efficiently and evenly.

[0014] The present invention can achieve more uniform internal heating of the raw materials when the raw materials of the device are stirred by arranging a heat equalizing component. The heating plate heats the raw materials while stirring. At the same time, the servo motor pulls the sliding rod through the connecting piece to move in the inner cavity of the limiting arc groove, thereby adjusting the position of the heating rod. The control cabinet can control the heating temperature and the position of the heating rod according to the data generated by the high-precision temperature sensor and the thermometer, so that the temperature difference inside the raw materials is smaller and the heat transfer efficiency of the raw materials is better, thereby solving the problem of the jacket being located on the outer wall of the polymerization kettle. This design will form a temperature difference from the inside to the outside of the polymerization kettle when the temperature is adjusted, affecting the heat transfer efficiency between the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the kettle body of the present invention; Figure 3 It is a side view structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the structure of the stirring assembly of the present invention; Figure 5 It is a schematic diagram of the stirring rod structure of the present invention; Figure 6 It is a schematic diagram of the structure of the heat soaking assembly of the present invention; Figure 7 It is an enlarged schematic diagram of structure A of the present invention; Figure 8 It is an enlarged schematic diagram of structure B of the present invention; Fig. 9 It is an enlarged schematic diagram of the C structure of the present invention.

[0016] In the figure: 1, mounting bracket; 2, control cabinet; 3, jacket; 4, kettle body; 5, heat soaking assembly; 501, limit bracket; 502, mounting base plate; 503, servo motor; 504, rotating disk; 505, spherical rotary joint 1; 506, connecting plate; 507, limit arc groove; 508, slide bar; 509, mounting shell; 510, heating rod; 511, temperature device; 512, spherical rotary joint 2; 6, upper plate; 7, fixed bracket; 8, isolation tank; 9, stirring assembly; 901, fixed shell; 902, limit Shell; 903, stirring motor; 904, connecting sleeve; 905, stirring rod; 906, limiting slide; 907, limiting block; 908, fixing block; 909, mounting plate; 910, limiting sleeve; 911, pull rod; 912, magnetic adsorption block; 913, hinge; 914, paddle; 915, electric control magnet; 916, limiting ring; 917, high-precision temperature sensor; 918, heating plate; 10, hinge; 11, baffle; 12, handle; 13, connecting valve; 14, liquid pump; 15, liquid outlet valve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Example: See Figure 1-9 A polymerization kettle for producing low-polymerization degree PVC resin shown in the figure comprises a mounting bracket 1, a control cabinet 2 is mounted on the outer wall of the mounting bracket 1, a jacket 3 is mounted on the inner wall of the mounting bracket 1, and a kettle body 4 is mounted on the inner wall of the jacket 3, a heat equalization component 5 is mounted on the outer wall of the kettle body 4, an upper plate 6 is mounted at the port of the kettle body 4, an isolation tank 8 is mounted on the top of the upper plate 6 through a fixed bracket 7, a stirring component 9 is mounted on one side of the fixed bracket 7 and on the outer wall of the upper plate 6, baffles 11 are mounted on the opposite side walls of the upper plate 6 through hinges 10, a handle 12 is mounted on the outer wall of the baffle 11, and the baffle 11 and the upper plate 6 cooperate with each other to seal the port of the kettle body 4, a connecting valve 13 is mounted on the base surface of the upper plate 6 through a conduit, and the connecting valve 13 is located on one side of the stirring component 9, a liquid pump 14 is mounted on the outer wall of the mounting bracket 1, and a liquid outlet valve 15 is mounted on the bottom of the kettle body 4 through a conduit.

[0019] In this embodiment, specific reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Fig. 9The stirring assembly 9 includes a fixed shell 901 and a limiting shell 902. The fixed shell 901 is installed on the outer wall of the upper plate 6. The cross section of the fixed shell 901 is a concave structure. A stirring motor 903 is installed on the outer wall of the fixed shell 901 through bolts. The driving shaft of the stirring motor 903 sequentially penetrates the fixed shell 901 and the upper plate 6, and one end of the driving shaft of the stirring motor 903 extends to the inner cavity of the kettle body 4 and is installed with a connecting sleeve 904. The connecting sleeve 904 is a semicircular structure with two groups, and the connecting sleeves 904 are fixed by bolts. A stirring rod 905 is installed, and a limiting slide groove 906 is provided on the outer wall of the stirring rod 905. A limiting block 907 is installed on the inner wall of the limiting slide groove 906. A fixed block 908 is slidably connected to one side of the limiting block 907 and is located on the outer wall of the stirring rod 905. The fixed block 908 is provided with two groups and is respectively arranged on the outer wall of the stirring rod 905 from top to bottom, wherein the limiting block 907 is slidably connected to the inner wall of the fixed block 908 for lateral limiting, and a mounting plate 909 is installed in a circular array on the outer wall of the fixed block 908, and the mounting plate 909 is inclined relative to the top surface of the fixed block 908. The outer wall of the mounting plate 909 is inclined at 45 degrees. A limiting sleeve 910 is installed on the inner wall of the limiting sleeve 910. A pull rod 911 is slidably connected to one end of the pull rod 911. A magnetic adsorption block 912 is arranged at one end of the pull rod 911. The pull rods 911 are grouped in pairs. The length of one group pulling the upper fixed block 908 is longer than the length of the other group pulling the lower fixed block 908. The length is 3-5 cm. A hinge 913 is installed on the outer wall of the mounting plate 909 through bolts. A dial plate 914 is installed at one end of the hinge 913. The limiting housing 902 is provided with multiple groups symmetrically arranged on the inner wall of the upper plate 6, and the limiting housing 90 2 is located at the inner cavity port of the kettle body 4, an electric-controlled magnet 915 is arranged on the inner wall of the limit shell 902, the limit shell 902 is located directly above the pull rod 911 and there is a gap between the limit shell 902 and the pull rod 911, and the electric-controlled magnet 915 magnetically adsorbs the magnetic adsorption block 912, a limit ring 916 is arranged on one side of the fixed block 908 and at the bottom of the stirring rod 905, a high-precision temperature sensor 917 is embedded on the outer wall of the mounting plate 909, and a heating plate 918 is embedded on one side of the high-precision temperature sensor 917 and at the outer wall of the mounting plate 909.

[0020] In this embodiment, specific reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7The heat-saturating assembly 5 includes a limit bracket 501 and a mounting base plate 502. The limit bracket 501 is mounted at the bottom of the kettle body 4. A servo motor 503 is mounted on the outer wall of the limit bracket 501. The driving shaft of the servo motor 503 passes through the kettle body 4 and extends to the inner cavity of the kettle body 4. A rotating disk 504 is mounted. A spherical rotating joint 505 is mounted on the outer wall of the rotating disk 504 in an equidistant array. The spherical rotating joint 505 is in a ring structure. A connecting plate 506 is mounted on the outer wall of the spherical rotating joint 505. The mounting base plate 502 is provided with two groups of symmetrically mounted At the inner cavity port opposite to the kettle body 4, a limiting arc groove 507 is opened in a circular array on the outer wall of the mounting substrate 502, wherein a slide rod 508 is slidably connected to the inner wall of the limiting arc groove 507, and a mounting shell 509 is installed between the opposite slide rods 508, a heating rod 510 is embedded in the outer wall of the mounting shell 509, and a temperature device 511 is installed on the outer wall of the mounting shell 509, wherein the slide rod 508 at the bottom of the inner cavity of the kettle body 4 is provided with a spherical rotating joint 2 512, and the outer wall of the spherical rotating joint 2 512 is connected to a connecting plate 506.

[0021] Among them, the liquid outlet valve 15 is located on one side of the heat equalizing component 5. When the raw materials are stirred evenly, it is only necessary to open the liquid outlet valve 15 to discharge the stirred raw materials; the control cabinet 2 is connected to the servo motor 503, the heating rod 510, the temperature device 511, the stirring motor 903, the electric controlled magnet 915, the high-precision temperature sensor 917 and the liquid pump 14 through wires, and the connection method is electrical connection, so that the device is powered on, and foot pads are respectively arranged at the bottom corners of the mounting bracket 1 to make the device more stable.

[0022] The present invention is used for producing a polymerization kettle of low-polymerization degree PVC resin. When the polymerization kettle is working, baffles 11 are installed on the side walls opposite to the upper plate 6 through hinges 10, wherein a handle 12 is installed on the outer wall of the baffle 11, and the baffle 11 and the upper plate 6 cooperate with each other to seal the port of the kettle body 4. It is only necessary to pull the handle 12 to lift it, and the handle 12 drives the baffle 11 to rotate with the hinge 10 as the center point, and the baffle 11 opens, and then the raw materials to be processed are poured into the inner cavity of the kettle body 4 after proportioning, and a stirring motor 9 is installed on the outer wall of the fixed shell 901 through bolts. 03, the driving shaft of the stirring motor 903 passes through the fixed shell 901 and the upper plate 6 in sequence, and one end of the driving shaft of the stirring motor 903 extends to the inner cavity of the kettle body 4 and is installed with a connecting sleeve 904. The connecting sleeve 904 is a semicircular structure with two groups, and the connecting sleeves 904 are fixed by bolts. Under the action of the stirring rod 905 installed on the inner wall of the connecting sleeve 904, it is only necessary to turn on the switch of the control cabinet 2 to make the control cabinet 2 control the operation of the stirring motor 903, and then the driving shaft of the stirring motor 903 drives the stirring rod 905 to rotate through the connecting sleeve 904.

[0023] A limiting groove 906 is provided on the outer wall of the stirring rod 905, and a limiting block 907 is installed on the inner wall of the limiting groove 906. A fixed block 908 is slidably connected to one side of the limiting block 907 and is located on the outer wall of the stirring rod 905. The fixed block 908 is provided with two groups and is respectively arranged on the outer wall of the stirring rod 905 from top to bottom, wherein the limiting block 907 is slidably connected to the inner wall of the fixed block 908 for lateral limiting, and a mounting plate 909 is installed in a circular array on the outer wall of the fixed block 908, and the mounting plate 909 is inclined at 45 degrees relative to the top surface of the fixed block 908. When the stirring rod 905 rotates, the stirring rod 905 drives the fixed block 908 to rotate through the limiting block 907, and then the fixed block 908 drives the mounting plate 909 to rotate, so as to stir the raw materials in the inner cavity of the kettle body 4.

[0024] By installing a limiting sleeve 910 on the outer wall of the mounting plate 909, a pull rod 911 is slidably connected to the inner wall of the limiting sleeve 910, a magnetic adsorption block 912 is arranged at one end of the pull rod 911, the limiting shell 902 is located at the inner cavity port of the kettle body 4, an electric-controlled magnet 915 is arranged on the inner wall of the limiting shell 902, the limiting shell 902 is located directly above the pull rod 911 and there is a gap between the limiting shell 902 and the pull rod 911, and the electric-controlled magnet 915 magnetically adsorbs the magnetic adsorption block 912. When the stirring rod 905 drives the mounting plate 909 to rotate, the control cabinet 2 controls multiple groups of electric-controlled magnets 915 to circulate power, so that two groups of electric-controlled magnets 915 produce magnetic adsorption, and the other two groups of electric-controlled magnets 915 are electrically controlled. The magnet 915 generates magnetic repulsion. When the stirring rod 905 drives the mounting plate 909 to rotate, the mounting plate 909 drives the limiting sleeve 910 to rotate, and the limiting sleeve 910 drives the pull rod 911 to rotate. When the pull rod 911 rotates and drives the magnetic adsorption block 912 to pass directly under the electro-controlled magnet 915, the electro-controlled magnet 915 generates suction on the magnetic adsorption block 912, so that the magnetic adsorption block 912 drives the pull rod 911 to slide upward on the inner wall of the limiting sleeve 910. When the magnetic adsorption block 912 moves to another group of electro-controlled magnets 915, the electro-controlled magnet 915 generates repulsion on the magnetic adsorption block 912, so that the magnetic adsorption block 912 drives the pull rod 911 to slide downward on the inner wall of the limiting sleeve 910.

[0025] By simultaneously grouping the pull rods 911 in pairs, with one group pulling the upper fixed block 908 longer than the other group pulling the lower fixed block 908, with a length of 3-5 cm, since the pull rods 911 are grouped in pairs, it is only necessary to control the electric-controlled magnet 915 to generate magnetism for adsorption or repulsion, and the limit block 907 is slidably connected to the inner wall of the fixed block 908 for lateral limitation, so that the shorter pull rod 911 pulls the fixed block 908 above the stirring rod 905 to move vertically along the limit slide groove 906, and then the longer pull rod 911 pulls the fixed block 908 below the stirring rod 905 to move vertically along the limit slide groove 9 06 moves vertically, which can better stir the raw materials above the inner cavity of the kettle body 4, and at the same time, the raw materials settled at the bottom of the inner cavity of the kettle body 4 can also be better stirred. The pull rod 911 circulates to drive the mounting plates 909 at the upper and lower ends of the stirring rod 905 to move up and down, so that the mounting plates 909 can move up and down when stirring the raw materials. When the raw materials are stirred horizontally, they can also be stirred vertically, so that the raw materials are better mixed, thereby solving the problem that when the raw materials are added into the existing low-polymerization degree PVC resin polymerization kettle for stirring, the added materials will accumulate on the top or settle to the bottom, which makes the raw materials unable to be efficiently and evenly mixed.

[0026] A hinge 913 is installed on the outer wall of the mounting plate 909 through bolts, and a paddle 914 is installed at one end of the hinge 913. The limiting shell 902 is provided with multiple groups of paddles symmetrically arranged on the inner wall of the upper plate 6. Under the above principle, when the mounting plate 909 moves up and down, since the paddle 914 rotates on the outer wall of the hinge 913, the paddle 914 will also swing in the raw materials, so that the stirring effect of the raw materials is better, thereby solving the problem that the raw materials cannot be mixed efficiently and evenly.

[0027] When the raw materials are stirred in the stirring assembly 9, a rotating disk 504 is installed on the driving shaft of the servo motor 503 that passes through the kettle body 4 and extends to the inner cavity of the kettle body 4. Spherical rotating joints 505 are installed in an equidistant array on the outer wall of the rotating disk 504, and the spherical rotating joints 505 form a ring structure. Under the action of a connecting plate 506 installed on the outer wall of the spherical rotating joint 505, the control cabinet 2 controls the servo motor 503 to operate, and the driving shaft of the servo motor 503 drives the rotating disk 504 to rotate, so that the rotating disk 504 drives the connecting plate 506 to move through the spherical rotating joint 505. At the same time, a limiting arc groove 507 is opened in a ring array on the outer wall of the mounting base plate 502, wherein a slide rod 508 is slidably connected to the inner wall of the limiting arc groove 507, and a mounting shell 509 is installed between the opposing slide rods 508. A heating rod 510 is embedded in the outer wall of the shell 509, and a temperature controller 511 is installed on the outer wall of the installation shell 509, wherein the slide bar 508 at the bottom of the inner cavity of the kettle body 4 is provided with a spherical rotating joint 2 512, and the outer wall of the spherical rotating joint 2 512 is connected to the connecting plate 506. After the above steps, when the spherical rotating joint 1 505 drives the connecting plate 506 to move, the connecting plate 506 pulls the spherical rotating joint 2 512 to move, and then the spherical rotating joint 2 512 drives the slide bar 508 to slide on the inner wall. It is only necessary to control the forward and reverse rotation of the servo motor 503 to control the movement of the connecting plate 506, and then the connecting plate 506 pulls the slide bar 508 to move on the inner wall of the limiting arc groove 507, so that the slide bar 508 drives the heating rod 510 to move in the inner cavity of the kettle body 4 through the installation shell 509.

[0028] By controlling the heating plate 918 and the heating rod 510 to heat by the control cabinet 2 at the same time, the heating plate 918 heats the center of the raw material and heats while stirring. At the same time, the control cabinet 2 can control the heating temperature and the position of the heating rod 510 according to the data generated by the high-precision temperature sensor 917 and the thermometer 511, so that the temperature difference inside the raw material is smaller and the heat transfer efficiency of the raw material heating is better, thereby solving the problem that the jacket is located on the outer wall of the polymerization kettle. This design will form a temperature difference from the inside to the outside of the polymerization kettle when the temperature is adjusted, thereby affecting the heat transfer efficiency between the materials. Especially in the mixing process, how to ensure that while maintaining a low degree of polymerization of the resin, effective heat transfer between the materials can be guaranteed.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polymerization kettle for producing low-polymerization degree PVC resin, comprising a mounting bracket (1), characterized in that: A control cabinet (2) is mounted on the outer wall of the mounting bracket (1), a jacket (3) is mounted on the inner wall of the mounting bracket (1), and a kettle body (4) is mounted on the inner wall of the jacket (3), a heat-saturating component (5) is mounted on the outer wall of the kettle body (4), an upper plate (6) is mounted at the port of the kettle body (4), an isolation tank (8) is mounted on the top of the upper plate (6) through a fixed bracket (7), and a stirring component (9) is mounted on one side of the fixed bracket (7) and on the outer wall of the upper plate (6); The stirring assembly (9) comprises a fixed shell (901) and a limiting shell (902), wherein the fixed shell (901) is mounted on the outer wall of the upper plate (6), the cross section of the fixed shell (901) is a concave structure, a stirring motor (903) is mounted on the outer wall of the fixed shell (901) via bolts, the driving shaft of the stirring motor (903) sequentially passes through the fixed shell (901) and the upper plate (6), and one end of the driving shaft of the stirring motor (903) extends to the inner cavity of the kettle body (4) and is mounted with a connecting bolt. A connecting sleeve (904) is provided, wherein the connecting sleeve (904) is a semicircular structure and is provided in two groups, and the connecting sleeves (904) are fixed to each other by bolts, a stirring rod (905) is installed on the inner wall of the connecting sleeve (904), a limiting slide groove (906) is provided on the outer wall of the stirring rod (905), a limiting block (907) is installed on the inner wall of the limiting slide groove (906), and a fixing block (908) is slidably connected to one side of the limiting block (907) and located on the outer wall of the stirring rod (905).

2. A polymerization kettle for producing low polymerization degree PVC resin according to claim 1, characterized in that: The fixed blocks (908) are provided in two groups and are respectively provided on the outer wall of the stirring rod (905) from top to bottom, wherein the limit blocks (907) are slidably connected to the inner wall of the fixed blocks (908) for lateral limit, and mounting plates (909) are installed in a ring array on the outer wall of the fixed blocks (908), and the mounting plates (909) are inclined at 45 degrees relative to the top surface of the fixed blocks (908), and the limit sleeves (910) are installed on the outer wall of the mounting plates (909), and the inner wall of the limit sleeves (910) is slidably connected to the pull rods (911), and one end of the pull rods (911) is provided with a magnetic adsorption block (912), and the pull rods (911) are grouped in pairs, and the length of one group pulling the upper fixed block (908) is longer than that of the other group pulling the lower fixed block (908), and the length is 3-5 cm, and the outer wall of the mounting plate (909) is installed with hinges (913) through bolts; A shift plate (914) is installed at one end of the hinge (913), the limit shell (902) is provided with multiple groups symmetrically arranged on the inner wall of the upper plate (6), and the limit shell (902) is located at the inner cavity port of the kettle body (4), and an electric-controlled magnet (915) is arranged on the inner wall of the limit shell (902), the limit shell (902) is located directly above the pull rod (911) and there is a gap between the limit shell (902) and the pull rod (911), and the electric-controlled magnet (915) magnetically adsorbs the magnetic adsorption block (912), and a limit ring (916) is arranged on one side of the fixed block (908) and at the bottom of the stirring rod (905).

3. A polymerization kettle for producing low polymerization degree PVC resin according to claim 1, characterized in that: A high-precision temperature sensor (917) is embedded in the outer wall of the mounting plate (909), and a heating plate (918) is embedded in one side of the high-precision temperature sensor (917) and located on the outer wall of the mounting plate (909).

4. A polymerization kettle for producing low polymerization degree PVC resin according to claim 1, characterized in that: Baffles (11) are respectively installed on the side walls opposite to the upper plate (6) through hinges (10), wherein a handle (12) is installed on the outer wall of the baffle (11), and the baffle (11) and the upper plate (6) cooperate with each other to seal the port of the kettle body (4), and a connecting valve (13) is installed on the base surface of the upper plate (6) through a conduit.

5. A polymerization kettle for producing low polymerization degree PVC resin according to claim 4, characterized in that: The connecting valve (13) is located on one side of the stirring assembly (9), a liquid pump (14) is installed on the outer wall of the mounting bracket (1), and a liquid outlet valve (15) is installed at the bottom of the kettle body (4) through a conduit.

6. A polymerization kettle for producing low polymerization degree PVC resin according to claim 1, characterized in that: The heat-saturating component (5) comprises a limiting bracket (501) and a mounting base plate (502); the limiting bracket (501) is mounted on the bottom of the kettle body (4); a servo motor (503) is mounted on the outer wall of the limiting bracket (501); a driving shaft of the servo motor (503) passes through the kettle body (4) and extends to the inner cavity of the kettle body (4) where a rotating disk (504) is mounted.

7. A polymerization kettle for producing low polymerization degree PVC resin according to claim 6, characterized in that: Spherical rotating joints (505) are installed in an equidistant array on the outer wall of the rotating disk (504), and the spherical rotating joints (505) are in an annular structure. A connecting plate (506) is installed on the outer wall of the spherical rotating joint (505).

8. A polymerization kettle for producing low polymerization degree PVC resin according to claim 6, characterized in that: The mounting substrate (502) is provided with two groups and is symmetrically mounted at opposite inner cavity ports of the kettle body (4). The outer wall of the mounting substrate (502) is provided with limiting arc grooves (507) in a circular array, wherein a slide rod (508) is slidably connected to the inner wall of the limiting arc groove (507), and a mounting shell (509) is installed between the opposite slide rods (508).

9. A polymerization kettle for producing low polymerization degree PVC resin according to claim 8, characterized in that: A heating rod (510) is embedded in the outer wall of the installation shell (509), and a temperature device (511) is installed on the outer wall of the installation shell (509), wherein the sliding rod (508) at the bottom of the inner cavity of the kettle body (4) is provided with a second spherical rotating joint (512), and the outer wall of the second spherical rotating joint (512) is connected to a connecting plate (506), and the control cabinet (2) is respectively connected to a servo motor (503), a heating rod (510), a temperature device (511), a stirring motor (903), an electric control magnet (915), a high-precision temperature sensor (917) and a liquid pump (14) through wires, and the connection method is electrical connection.

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