A PVC stabilizer stability detection device

Abstract

This invention discloses a PVC stabilizer stability testing device, relating to the field of thermogravimetric stability testing technology. The device includes a base, a lifting component mounted on the base, a cover mounted on the lifting component, a heating module at the bottom of the cover, a microbalance installed inside the base, a support rod mounted on the microbalance, the support rod penetrating the bottom of the working tank and located directly below the heating module, and a crucible platform mounted on the top of the support rod. The cover includes an atmosphere assembly, a heat dissipation assembly, and a lifting rod. A protective assembly is mounted on the actuating end of the lifting rod, and a separation assembly is installed within the protective assembly. The heat dissipation assembly cools the heating module, shortening the waiting time and improving practicality. During forced cooling, the lifting rod lowers the protective assembly to protect the sample and crucible from being blown away, thus preventing damage or contamination of the heating module. After cooling, the crucible often sticks to the crucible platform; the separation assembly lifts the crucible to prevent sticking.

Description

Technical Field

[0001] This invention relates to the field of thermogravimetric stability testing technology, specifically a device for testing the stability of PVC stabilizers. Background Technology

[0002] PVC (also known as polyvinyl chloride, a general-purpose plastic polymerized from vinyl chloride monomers) is prone to degradation and discoloration due to heat during processing. Heat stabilizers can inhibit decomposition, delay yellowing, and improve long-term heat resistance and processing performance. They are suitable for various PVC systems, including pipes, profiles, and flexible products. Common types include lead salts, organotin compounds, calcium zinc, and rare earth stabilizers. Because they improve long-term heat resistance and processing performance and are suitable for various PVC systems, it is necessary to test their heat resistance.

[0003] When traditional thermogravimetric analyzers are cooled after use, the sample is placed in the heating chamber. If the airflow inside is increased, the sample and crucible may be blown away, damaging or contaminating the heating chamber. At the same time, after cooling, the crucible and rack of traditional thermogravimetric analyzers tend to stick together, which is a cumbersome process. Therefore, there is an urgent need for a PVC stabilizer stability testing device that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a PVC stabilizer stability testing device to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The stability testing device includes a base, a working groove is provided on the base, a constant temperature chamber is provided in the base directly below the working groove, a lifting component is provided on one side of the working groove, a cover is installed on the lifting component, a heating module is provided at the bottom of the cover, a micro balance is installed in the constant temperature chamber, a support rod is installed on the micro balance, the support rod passes through the bottom of the working groove and is located directly below the heating module, and a crucible platform is installed on the top of the support rod; The heating module includes an inner cavity and a furnace chamber; The housing is equipped with an atmosphere assembly, a heat dissipation assembly, and a lifting rod. A protective assembly is installed at the actuating end of the lifting rod, and a separation assembly is installed inside the protective assembly. The protective components include a housing, a hollow slide bar, a cover, and a hollow column; The lifting rod has a housing at its actuator end, and a hollow slide rod is installed at the bottom of the housing. One end of the hollow slide rod passes through the outer wall of the furnace and the inner wall of the inner cavity and is fitted with a cover. The cover is coaxial with the center of the support rod. A hollow column is fitted around the support rod, with a gap between the hollow column and the support rod. When testing the stability of PVC stabilizer, the lifting component is first controlled to raise the cover, then the sample to be tested is placed in the crucible and placed on the crucible platform. Finally, the cover is controlled to lower, placing the sample inside the heating module. Inert gas is introduced into the heating module through the atmosphere component until the air between the heating module and the sample is completely exhausted. During heating, the sample decomposes as the temperature rises. At this time, a trace amount of gas is used to detect the decomposition. The reduction in weight is reflected in changes in temperature and time. After the test is completed, the sample and crucible must be removed only after the heating module has cooled to room temperature. At this time, the heat dissipation component provides forced air cooling to both the inside and outside of the heating module, shortening the waiting interval and improving practicality. During forced cooling, the lifting rod drives the shell to press down the hollow slide bar, so that the cover head contacts the hollow column to form a relatively sealed space, preventing the sample and crucible from being blown away and thus damaging or contaminating the heating module. After cooling is complete, the crucible often sticks to the crucible platform. The separation component picks up the crucible to prevent sticking.

[0006] As a preferred technical solution, the atmosphere assembly includes a gas storage tank, a pressure regulating valve, an air inlet pipe, an exhaust port, and an exhaust passage; A gas storage tank is installed on the top of the casing, and an air inlet pipe is installed at the output end of the gas storage tank. The outlet end of the air inlet pipe passes through the side wall of the casing and the furnace. An exhaust port is opened on the working slot directly below the furnace. An exhaust channel is opened at the bottom of the exhaust port, and multiple exhaust ports are connected to the exhaust channel. When inert gas is introduced into the heating module, the gas storage tank continuously fills the furnace with inert gas through the air inlet pipe, and the stability of its input is ensured by a pressure regulating valve. Air is discharged from the exhaust port and the exhaust channel to ensure that the sample is isolated from oxygen pyrolysis and simulates oxidation aging during the heating process.

[0007] As a preferred technical solution, the heat dissipation component includes a blower unit, a make-up air branch pipe, a solenoid valve, and an air cavity; A blower unit is installed on the top of the casing, away from the gas storage tank. The output end of the blower unit is connected to the air inlet pipe. An air chamber is formed between the outer wall of the furnace and the inner wall of the inner cavity. An exhaust channel connected to the inner cavity is opened inside the casing. The air inlet pipe and the air chamber are connected by a make-up air branch pipe. Solenoid valves are installed on both the make-up air branch pipe and the output end of the blower unit. After the heating and testing are completed, the pressure stabilizing valve is closed, and the solenoid valves at the output ends of the make-up air branch pipe and the blower unit are opened. The blower unit forces air cooling both inside and outside the furnace simultaneously, increasing the airflow rate to remove heat. By sharing an exhaust end with the furnace and the atmosphere assembly, waste particles generated by sample decomposition can be removed from the inner walls of the furnace, exhaust port, and exhaust channel while accelerating cooling, thus increasing its service life.

[0008] As a preferred technical solution, the separation component includes an electric push rod and a clamping unit; An electric push rod is installed inside the shell, and a clamping unit is installed at the actuator end of the electric push rod. The clamping unit passes through the inner hole of the hollow slide rod and enters the furnace. When the cover head contacts the hollow column, the electric push rod drives the clamping unit to descend and clamp the crucible. Then, it takes the crucible and the sample away from the crucible platform together, which plays a role in protection and separation.

[0009] As a preferred technical solution, the clamping unit is an external clamping component, which includes a slide tube, a limiting groove, a piston, a return spring, a push rod, a gripper, an anti-collision groove, and an air supply component; A sliding tube is slidably installed inside a hollow sliding rod. The actuating end of an electric push rod is connected to the top of the sliding tube. A limit groove is opened inside the sliding tube near the bottom, and a piston is slidably installed in the limit groove. The piston and the bottom of the limit groove are connected by a return spring. A push rod is concentrically installed at the bottom of the piston. The diameter of the push rod is not greater than the outer diameter of the sliding tube. A gripper is symmetrically rotated at the bottom of the sliding tube. An anti-collision groove is opened between the two grippers. One end of the push rod extends out of the anti-collision groove and is hinged to the two grippers. An air supply device is installed on the top of the cover. The air supply device is connected to the sliding tube near the top end through a pipe. When the electric push rod descends, the sliding tube and the grippers descend together. At this time, the air supply device inflates the sliding tube and pushes the piston down. The push rod descends and pushes the two grippers apart, so that the distance between the grippers is greater than the diameter of the crucible. After the bottom of the grippers descends to a point slightly below the top of the crucible, the air supply device stops holding pressure and releases air. Under the action of the return spring, the push rod moves up, so that the two grippers clamp the crucible. This method will not directly or indirectly contact the microbalance, and can provide good protection.

[0010] As a preferred technical solution, the clamping unit is an inner clamping component, which includes a slide bar, a circular groove, a trapezoidal wing, and a shrinkage groove. A sliding rod is slidably installed inside a hollow sliding rod. One end of the sliding rod extends out of the hollow sliding rod and is fitted with a circular groove. Multiple contraction grooves are opened on the side wall of the circular groove, and a trapezoidal wing is installed at the bottom end of the side wall of the circular groove. When the electric push rod descends, it drives the circular groove at the end of the sliding rod to descend. The diameter of the bottom end of the circular groove should not be greater than the inner diameter of the crucible. When it contacts the crucible mouth, it squeezes the trapezoidal wing and adapts to the inner diameter of the crucible through the contraction groove. The crucible is lifted from the inside by the squeezing friction. This method will subject the micro balance to a certain force, but the structure is simple and easy to implement.

[0011] As a preferred technical solution, an inner cavity is opened at the bottom of the cover, and a furnace is installed inside the inner cavity. A gap is left between the outer wall of the furnace and the inner wall of the inner cavity, and a heating wire is installed inside the furnace.

[0012] As a preferred technical solution, an exhaust gas filter unit is installed inside the base, and the exhaust gas filter unit is connected to the exhaust channel.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. After testing, this application uses a heat dissipation component to simultaneously force-cool the heating module inside and out, shortening the waiting time and improving practicality. During forced cooling, the lifting rod drives the shell to press down the hollow slide bar, so that the cover head contacts the hollow column to form a relatively sealed space, preventing the sample and crucible from being blown away and thus damaging or contaminating the heating module. After cooling is complete, the crucible often sticks to the crucible platform. The separation component picks up the crucible to avoid sticking.

[0014] 2. This application uses a blowing unit to force air cooling both inside and outside the furnace simultaneously, increasing the airflow rate to remove heat; by sharing an exhaust end between the furnace and the atmosphere assembly, waste particles generated during sample decomposition can be removed from the inner walls of the furnace, exhaust port, and exhaust channel while accelerating cooling, thus increasing its service life.

[0015] 3. In this application, the sliding tube lowers the clamps together. At this time, the gas supply unit fills the sliding tube with air and pushes the piston down. The push rod then descends and pushes the two clamps apart, so that the distance between the clamps is greater than the diameter of the crucible. After the bottom of the clamps descends to a point slightly below the top of the crucible, the gas supply unit stops holding the pressure and releases the gas. Under the action of the return spring, the push rod moves up, so that the two clamps clamp the crucible. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention; Figure 2 This is a schematic diagram of the overall second-view structure of the present invention; Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention; Figure 4This is a schematic diagram of the second cross-sectional structure of the present invention; Figure 5 This is a schematic diagram of the third cross-sectional structure of the present invention; Figure 6 This is a schematic diagram of the clamping unit structure according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the clamping unit structure according to Embodiment 2 of the present invention; Figure 8 for Figure 4 A magnified structural diagram at point A in the diagram; Figure 9 for Figure 5 A magnified structural diagram at point B in the diagram; Figure 10 for Figure 6 A magnified structural diagram at point C.

[0017] In the diagram: 1. Base; 11. Working tank; 12. Constant temperature chamber; 13. Cover; 14. Support rod; 15. Crucible platform; 2. Lifting component; 3. Heating module; 31. Inner cavity; 32. Furnace chamber; 4. Micro balance; 5. Atmosphere assembly; 51. Gas storage tank; 52. Pressure regulating valve; 53. Inlet pipe; 54. Exhaust port; 55. Exhaust channel; 6. Heat dissipation assembly; 61. Blowing unit; 62. Make-up air branch pipe; 63. Solenoid valve; 64. Air... 7. Cavity; 8. Lifting rod; 9. Protective assembly; 10. Housing; 11. Hollow slide rod; 12. Cover; 13. Hollow column; 14. Separation assembly; 15. Slide tube; 16. Limiting groove; 17. Piston; 18. Return spring; 19. Top rod; 10. Gripper; 10. Anti-collision groove; 11. Air supply component; 12. Electric push rod; 13. Slide rod; 14. Circular groove; 15. Trapezoidal fin; 16. Shrinkage groove; 17. Exhaust gas filter unit. Detailed Implementation

[0018] 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.

[0019] Example 1: As Figures 1-5 , Figure 8 and Figure 9As shown, the present invention provides a technical solution for a PVC stabilizer stability testing device. The stability testing device includes a base 1, a working groove 11 on the base 1, a constant temperature chamber 12 located directly below the working groove 11, a lifting component 2 on one side of the working groove 11, a cover 13 installed on the lifting component 2, a heating module 3 at the bottom of the cover 13, a micro balance 4 installed in the constant temperature chamber 12, a support rod 14 installed on the micro balance 4, the support rod 14 passing through the bottom of the working groove 11 and located directly below the heating module 3, and a crucible platform 15 installed on the top of the support rod 14. Heating module 3 includes an inner cavity 31 and a furnace chamber 32; The cover 13 is provided with an atmosphere component 5, a heat dissipation component 6 and a lifting rod 7. The lifting rod 7 is equipped with a protective component 8 at its actuating end, and a separation component 9 is provided inside the protective component 8. Protective component 8 includes a housing 81, a hollow slide bar 82, a cover 83, and a hollow column 84; A housing 81 is installed at the actuator end of the lifting rod 7. A hollow slide rod 82 is installed at the bottom of the housing 81. One end of the hollow slide rod 82 passes through the outer wall of the furnace 32 and the inner wall of the inner cavity 31 and is fitted with a cover 83. The cover 83 is coaxial with the center of the support rod 14. A hollow column 84 is fitted over the support rod 14, and a gap is left between the hollow column 84 and the support rod 14. When testing the stability of PVC stabilizer, the lifting component 2 is first controlled to raise the cover 13. Then, the sample to be tested is placed in the crucible and placed on the crucible platform 15. Finally, the cover 13 is controlled to lower, so that the sample is placed in the heating module 3. Inert gas is introduced into the heating module 3 through the atmosphere component 5 until the air between the heating module 3 and the sample is completely exhausted. During heating, the sample will rise with the temperature. During the decomposition process, the weight reduction, temperature, and time changes are reflected by the microbalance 4. After the test is completed, the sample and crucible must be removed only after the heating module 3 has cooled to room temperature. At this time, the heat dissipation component 6 provides forced air cooling to both the inside and outside of the heating module 3, shortening the waiting interval and improving practicality. During forced cooling, the lifting rod 7 drives the housing 81 to press down the hollow slide bar 82, so that the cover 83 contacts the hollow column 84 to form a relatively sealed space, preventing the sample and crucible from being blown away and thus damaging or contaminating the heating module 3. After cooling is complete, the crucible often sticks to the crucible platform 15. The separation component 9 picks up the crucible to prevent sticking.

[0020] The atmosphere assembly 5 includes an air tank 51, a pressure regulating valve 52, an air inlet pipe 53, an exhaust port 54, and an exhaust passage 55; A gas storage tank 51 is installed above the cover 13. An air inlet pipe 53 is installed at the output end of the gas storage tank 51. The outlet end of the air inlet pipe 53 passes through the side wall of the cover 13 and the furnace 32. An exhaust hole 54 is opened on the working groove 11 directly below the furnace 32. An exhaust channel 55 is opened at the bottom of the exhaust hole 54. Multiple exhaust holes 54 are connected to the exhaust channel 55. When inert gas is input into the heating module 3, the gas storage tank 51 continuously fills the furnace 32 with inert gas through the air inlet pipe 53. The stability of the input is ensured by the pressure regulating valve 52. Air is discharged from the exhaust hole 54 and the exhaust channel 55 to ensure that the sample is isolated from oxygen pyrolysis and simulates oxidation aging during the heating process.

[0021] The heat dissipation assembly 6 includes a blower unit 61, a make-up air branch pipe 62, a solenoid valve 63, and an air cavity 64; A blowing unit 61 is installed on the top side of the casing 13 away from the gas storage tank 51. The output end of the blowing unit 61 is connected to the air inlet pipe 53. An air chamber 64 is formed between the outer wall of the furnace 32 and the inner wall of the inner cavity 31. An exhaust channel connected to the inner cavity 31 is opened inside the casing 13. The air inlet pipe 53 and the air chamber 64 are connected by a make-up air branch pipe 62. Solenoid valves 63 are installed at the output ends of the make-up air branch pipe 62 and the blowing unit 61. When the heating and detection are completed, the pressure stabilizing valve 52 is closed, and the solenoid valves 63 at the output ends of the make-up air branch pipe 62 and the blowing unit 61 are opened. The blowing unit 61 provides forced air cooling to both the inside and outside of the furnace, increasing the airflow rate to remove heat. Alternatively, inert gas can still be used for forced cooling. Since the furnace 32 and the atmosphere assembly 5 share an exhaust end, waste particles generated by sample decomposition can be removed from the inner walls of the furnace 32, the exhaust port 54, and the exhaust channel 55 while accelerating cooling, thus increasing their service life.

[0022] Separation assembly 9 includes an electric push rod 98 and a clamping unit; An electric push rod 98 is installed inside the housing 81. A clamping unit is installed at the actuating end of the electric push rod 98. The clamping unit passes through the inner hole of the hollow slide rod 82 and enters the furnace chamber 32. When the cover head 83 contacts the hollow column 84, the electric push rod 98 drives the clamping unit to descend and clamp the crucible. Then, it takes the crucible and the sample away from the crucible platform 15 together, which plays a role in protection and separation.

[0023] like Figure 6 and Figure 10 As shown, the clamping unit is an external clamping component, which includes a slide tube 91, a limiting groove 92, a piston 93, a return spring 931, a push rod 94, a gripper 95, an anti-collision groove 96, and an air supply component 97. A slide tube 91 is slidably installed inside the hollow slide rod 82. The actuating end of the electric push rod 98 is connected to the top of the slide tube 91. A limit groove 92 is formed inside the slide tube 91 near the bottom end. A piston 93 is slidably installed inside the limit groove 92. The piston 93 is connected to the bottom of the limit groove 92 by a return spring 931. A push rod 94 is concentrically installed at the bottom of the piston 93. The diameter of the push rod 94 is not greater than the outer diameter of the slide tube 91. A gripper 95 is symmetrically rotated at the bottom of the slide tube 91. An anti-collision groove 96 is formed between the two grippers 95. One end of the push rod 94 extends out of the anti-collision groove 96 and is hinged to the two grippers 95. An air supply component 97 is installed on the top of the cover 13. The gas supply component 97 is connected to the slide tube 91 near the top via a pipe. When the electric push rod 98 descends, the slide tube 91 and the grippers 95 descend together. At this time, the gas supply component 97 inflates the slide tube 91, pushing the piston 93 down. The push rod 94 then descends, opening the two grippers 95, so that the distance between the grippers 95 is greater than the diameter of the crucible. After the bottom of the grippers 95 descends to a point slightly below the top of the crucible, the gas supply component 97 stops holding the pressure and releases the gas. Under the action of the return spring 931, the push rod 94 moves upward, causing the two grippers 95 to clamp the crucible. This method avoids direct or indirect contact with the microbalance 4, providing better protection.

[0024] The bottom of the cover 13 has an inner cavity 31, and a furnace 32 is installed inside the inner cavity 31. There is a gap between the outer wall of the furnace 32 and the inner wall of the inner cavity 31, and a heating wire is installed inside the furnace 32.

[0025] An exhaust gas filter unit 10 is installed inside the base 1, and the exhaust gas filter unit 10 is connected to the exhaust channel 55.

[0026] Example 2: The main difference between this example and Example 1 lies in the clamping unit; like Figure 7 As shown, the clamping unit is an inner clamping component, which includes a slide bar 99, a circular groove 910, a trapezoidal wing 911, and a shrinkage groove 912. A slide rod 99 is slidably installed inside the hollow slide rod 82. One end of the slide rod 99 extends out of the hollow slide rod 82 and is fitted with a circular groove 910. Multiple contraction grooves 912 are opened on the side wall of the circular groove 910. A trapezoidal wing 911 is installed at the bottom end of the side wall of the circular groove 910. When the electric push rod 98 descends, it drives the circular groove 910 at the end of the slide rod 99 to descend. The bottom diameter of the circular groove 910 should not be greater than the inner diameter of the crucible. When it contacts the crucible mouth, it squeezes the trapezoidal wing 911 and adapts to the inner diameter of the crucible through the contraction groove 912. The crucible is lifted from the inside by squeezing friction. This method will subject the micro balance 4 to a certain force, but the structure is simple and easy to implement.

[0027] Working principle of the invention: When testing the stability of PVC stabilizers, firstly, the lifting component 2 is controlled to raise the cover 13, then the sample to be tested is placed in the crucible and placed on the crucible platform 15. Finally, the cover 13 is controlled to lower, so that the sample is placed inside the heating module 3. Inert gas is introduced into the heating module 3 through the atmosphere component 5 until the air between the heating module 3 and the sample is completely exhausted. During heating, the sample will decompose as the temperature rises. At this time, the reduction in weight is reflected by the micro balance 4 in relation to the changes in temperature and time. After the test is completed, the sample and crucible need to be removed only after the heating module 3 has cooled to room temperature. At this time, the heat dissipation component 6 provides forced air cooling to both the inside and outside of the heating module 3, shortening the waiting interval and improving practicality. During forced cooling, the lifting rod 7 lowers the protective component 8 to protect the sample and crucible from being blown away, thereby preventing damage or contamination of the heating module 3. After cooling is completed, the crucible often sticks to the crucible platform 15. The separation component 9 is used to lift the crucible to prevent sticking.

[0028] When inert gas is introduced into the heating module 3, the gas storage tank 51 continuously introduces inert gas into the furnace 32 through the gas inlet pipe 53, and the pressure regulating valve 52 ensures the stability of the input. Air is discharged from the exhaust port 54 and the exhaust channel 55 to ensure that the sample is isolated from oxygen pyrolysis and simulates oxidation aging during the heating process.

[0029] After the heating test is completed, the pressure regulating valve 52 is closed, and the solenoid valve 63 at the output end of the air supply branch pipe 62 and the air blowing unit 61 is opened. The air blowing unit 61 simultaneously forces air cooling inside and outside the furnace, increasing the air flow rate to remove heat. Since the furnace 32 and the atmosphere component 5 share an exhaust end, while accelerating cooling, the waste particles generated by sample decomposition can be removed from the inner walls of the furnace 32, exhaust port 54 and exhaust channel 55, increasing their service life.

[0030] When heat dissipation is performed, the lifting rod 7 drives the housing 81 to press down the hollow slide rod 82, so that the cover 83 contacts the hollow column 84 to form a relatively sealed space, so that the sample and crucible will not be blown away, thereby damaging or contaminating the heating module 3.

[0031] When the cover 83 contacts the hollow column 84, the electric push rod 98 drives the clamping unit to descend and clamp the crucible, and then removes the crucible and sample together from the crucible platform 15, which plays a role in protecting and separating them.

[0032] When the electric push rod 98 descends, it causes the slide tube 91 and the grippers 95 to descend together. At this time, the air supply unit 97 pressurizes the slide tube 91 to push the piston 93 down. Then, the push rod 94 descends and pushes the two grippers 95 apart, so that the distance between the grippers 95 is greater than the diameter of the crucible. After the bottom of the grippers 95 descends to a point slightly below the top of the crucible, the air supply unit 97 stops holding the pressure and releases the air. Under the action of the return spring 931, the push rod 94 moves up, so that the two grippers 95 clamp the crucible. This method will not directly or indirectly contact the microbalance 4, and can provide better protection.

[0033] When the electric push rod 98 descends, it drives the circular groove 910 at the end of the slide rod 99 to descend. The diameter of the bottom of the circular groove 910 should not be greater than the inner diameter of the crucible. When it contacts the crucible opening, it squeezes the trapezoidal fin 911 and adapts to the inner diameter of the crucible through the shrinkage groove 912. The crucible is lifted from the inside by squeezing friction. This method will subject the micro balance 4 to a certain force, but the structure is simple and easy to implement.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A PVC stabilizer stability testing device, characterized in that: The stability testing device includes a base (1), on which a working groove (11) is provided. A constant temperature chamber (12) is provided in the base (1) directly below the working groove (11). A lifting component (2) is provided on one side of the working groove (11). A cover (13) is installed on the lifting component (2). A heating module (3) is provided at the bottom of the cover (13). A micro balance (4) is installed in the constant temperature chamber (12). A support rod (14) is installed on the micro balance (4). The support rod (14) passes through the bottom of the working groove (11) and is located directly below the heating module (3). A crucible platform (15) is installed on the top of the support rod (14). The heating module (3) includes an inner cavity (31) and a furnace chamber (32); An atmosphere assembly (5), a heat dissipation assembly (6), and a lifting rod (7) are provided on the cover (13). A protective assembly (8) is installed on the actuating end of the lifting rod (7). A separation assembly (9) is provided inside the protective assembly (8). The protective assembly (8) includes a housing (81), a hollow slide bar (82), a cover (83), and a hollow column (84). The lifting rod (7) is equipped with a housing (81) at its actuating end. A hollow slide rod (82) is installed at the bottom of the housing (81). One end of the hollow slide rod (82) passes through the outer wall of the furnace (32) and the inner wall of the inner cavity (31) and is equipped with a cover (83). The cover (83) is coaxial with the center of the support rod (14). A hollow column (84) is sleeved on the support rod (14). A gap is left between the hollow column (84) and the support rod (14).

2. The PVC stabilizer stability testing device according to claim 1, characterized in that: The atmosphere assembly (5) includes an air tank (51), a pressure regulator (52), an air inlet pipe (53), an exhaust port (54), and an exhaust passage (55). A gas storage tank (51) is provided above the cover (13). An air inlet pipe (53) is installed at the output end of the gas storage tank (51). The outlet end of the air inlet pipe (53) passes through the side wall of the cover (13) and the furnace (32). An exhaust hole (54) is provided on the working groove (11) directly below the furnace (32). An exhaust channel (55) is provided at the bottom of the exhaust hole (54), and multiple exhaust holes (54) are connected to the exhaust channel (55).

3. The PVC stabilizer stability testing device according to claim 2, characterized in that: The heat dissipation assembly (6) includes a blower unit (61), a make-up air branch pipe (62), a solenoid valve (63), and an air cavity (64). A blower unit (61) is installed on the top of the cover (13) away from the gas storage tank (51). The output end of the blower unit (61) is connected to the air inlet pipe (53). A wind cavity (64) is formed between the outer wall of the furnace (32) and the inner wall of the inner cavity (31). An exhaust channel connected to the inner cavity (31) is opened in the cover (13). The air inlet pipe (53) and the wind cavity (64) are connected by a supplementary air branch pipe (62). Solenoid valves (63) are installed at the output ends of the supplementary air branch pipe (62) and the blower unit (61).

4. The PVC stabilizer stability testing device according to claim 1, characterized in that: The separation assembly (9) includes an electric push rod (98) and a clamping unit; An electric push rod (98) is installed inside the housing (81). A clamping unit is installed at the actuating end of the electric push rod (98). The clamping unit passes through the inner hole of the hollow slide rod (82) and enters the furnace (32).

5. The PVC stabilizer stability testing device according to claim 4, characterized in that: The clamping unit is an external clamping component, which includes a slide tube (91), a limiting groove (92), a piston (93), a return spring (931), a push rod (94), a gripper (95), an anti-collision groove (96), and an air supply component (97). A slide tube (91) is slidably installed inside the hollow slide rod (82). The actuating end of the electric push rod (98) is connected to the top of the slide tube (91). A limiting groove (92) is opened inside the slide tube (91) near the bottom. A piston (93) is slidably installed inside the limiting groove (92). The piston (93) is connected to the bottom of the limiting groove (92) by a return spring (931). A push rod (94) is concentrically installed at the bottom of the piston (93). The diameter of the push rod (94) is not greater than the outer diameter of the slide tube (91). A gripper (95) is symmetrically rotated at the bottom of the slide tube (91). An anti-collision groove (96) is opened between the two grippers (95). One end of the push rod (94) extends out of the anti-collision groove (96) and is hinged to the two grippers (95). An air supply component (97) is installed on the top of the cover (13). The air supply component (97) is connected to the slide tube (91) near the top end by a pipe.

6. The PVC stabilizer stability testing device according to claim 4, characterized in that: The clamping unit is an inner clamping component, which includes a slide bar (99), a circular groove (910), a trapezoidal wing (911), and a shrinkage groove (912). A slide rod (99) is slidably installed inside the hollow slide rod (82). One end of the slide rod (99) extends out of the hollow slide rod (82) and is fitted with a circular groove (910). Multiple contraction grooves (912) are opened on the side wall of the circular groove (910). A trapezoidal wing (911) is installed at the bottom of the side wall of the circular groove (910).

7. The PVC stabilizer stability testing device according to claim 1, characterized in that: The bottom of the cover (13) is provided with an inner cavity (31), and a furnace (32) is installed in the inner cavity (31). There is a gap between the outer wall of the furnace (32) and the inner wall of the inner cavity (31), and a heating wire is installed inside the furnace (32).

8. The PVC stabilizer stability testing device according to claim 2, characterized in that: The base (1) is provided with an exhaust gas filter unit (10), which is connected to the exhaust channel (55).

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