Corrosion resistance detection equipment for plastic pipe

Abstract

The invention belongs to the technical field of corrosion resistance detection equipment, and relates to corrosion resistance detection equipment for a plastic pipe. Comprising an operation table, symmetrically distributed electric push rods are fixedly connected to the operation table, connecting shells are fixedly connected to the opposite sides of the symmetrically distributed electric push rods, connecting pieces are slidably connected into the connecting shells, tension detection modules are fixedly connected into the connecting shells, and a U-shaped frame is fixedly connected to the side, away from the tension detection modules, of each connecting piece; the U-shaped frame is rotationally connected with eccentric wheels which are symmetrically distributed, and the side, away from the adjacent connecting piece, of the U-shaped frame is fixedly connected with an inner supporting piece. The to-be-detected corrugated pipe is sealed through the inner supporting pieces at the two ends and is extruded and fixed through the eccentric wheel, so that a sealed environment is formed in the to-be-detected corrugated pipe, the corrosion environment is simulated by injecting salt mist into the to-be-detected corrugated pipe, and the mechanical property change of the corrugated pipe before and after corrosion is evaluated by combining a tension detection method. Therefore, the comprehensive performance of the corrugated pipe is evaluated.

Description

Technical Field

[0001] This invention relates to the field of corrosion resistance testing equipment, and more particularly to a corrosion resistance testing device for plastic pipes. Background Technology

[0002] In the application of new material plastic pipes, especially under harsh environmental conditions, their corrosion resistance directly affects the service life and safety of the pipes. Salt spray corrosion test, as a widely used accelerated corrosion test method, is an important means to evaluate the corrosion resistance of new material plastic pipes. This test simulates the corrosion conditions in the ocean or salty air by exposing the sample to a closed environment with high temperature, high humidity and high salt content. During the test, changes on the material surface can be observed, such as discoloration, blistering, cracking and peeling, thereby judging the corrosion resistance of the material.

[0003] Corrugated pipes, as a type of plastic pipe with a special structure, are widely used in drainage systems, cable protection, automotive parts and other fields due to their good flexibility and pressure resistance. However, due to their uneven corrugated structure, their durability in corrosive environments is more easily challenged compared to ordinary plastic pipes.

[0004] In the existing technology, the corrosion resistance test of plastic corrugated pipes mainly relies on salt spray test, which involves placing the corrugated pipe in a salt spray test chamber to simulate a corrosive environment and observing its surface changes or mass loss. However, this method can only reflect the surface corrosion of the material under static conditions and cannot assess the changes in its mechanical properties after corrosion, especially its performance under mechanical loads in actual use. It lacks a comprehensive evaluation of overall performance. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a device for testing the corrosion resistance of plastic pipes.

[0006] The technical implementation of the present invention is as follows: a corrosion resistance testing device for plastic pipes, comprising an operating table, wherein symmetrically distributed electric push rods are fixedly connected to the operating table, and connecting shells are fixedly connected to the opposing sides of the symmetrically distributed electric push rods, wherein a connecting member is slidably connected inside the connecting shell, and a tensile testing module is fixedly connected inside the connecting shell, the tensile testing module being used to detect the tensile force on the connecting member, a U-shaped frame is fixedly connected to the side of the connecting member away from the tensile testing module, symmetrically distributed eccentric wheels are rotatably connected to the U-shaped frame, an inner support member is fixedly connected to the side of the U-shaped frame away from the adjacent connecting member, and a protective member is fixedly connected to the connecting member and the adjacent inner support member, wherein a first connecting pipe is fixedly connected inside the protective member.

[0007] Furthermore, a first protective shell is provided on the operating table, which is used to cover the corrugated pipe to be tested.

[0008] Furthermore, a second protective shell is fixed inside the first protective shell. The second protective shell is absorbent paper, and the cross-sections of both the first and second protective shells are wavy.

[0009] Furthermore, a second connecting pipe is fixedly connected inside the protective member, and one end of the second connecting pipe near the adjacent inner support member passes through the adjacent connecting member.

[0010] Furthermore, a fixing ring is fixedly connected to the middle of the connector, and an elastic sleeve is provided on the fixing ring. The elastic sleeve is used to bind the first protective shell and the second protective shell to the adjacent fixing ring.

[0011] Furthermore, a support member is provided inside the elastic sleeve.

[0012] Furthermore, the operating table is provided with symmetrically distributed electric slide rails, each containing an electric slider. The electric sliders within the symmetrically distributed electric slide rails are collectively fixed to a first sliding frame. The first sliding frame is slidably connected to symmetrically distributed pressing frames. The pressing frames are provided with symmetrically distributed transverse grooves. The operating table is provided with symmetrically distributed guide rails. Symmetrically distributed second sliding frames are slidably connected between the symmetrically distributed guide rails. The second sliding frames are fixed to adjacent connecting members. The pressing frames hold adjacent second sliding frames in place. The second sliding frames are provided with symmetrically distributed guide grooves. The transverse grooves are slidably connected to sliding pins that slide along the corresponding guide grooves. The sliding pins are fixed to a fixing seat for driving the deformation of the tensioning sleeve.

[0013] Furthermore, the extrusion frame is provided with a first ball bearing for lubrication along the portion that slides along the first sliding frame, and the second sliding frame is provided with a second ball bearing for lubrication along the portion that slides along the symmetrically distributed guide rails.

[0014] Furthermore, the guide groove is composed of connected inclined grooves and arc-shaped grooves, both of which are used to guide adjacent sliding pins.

[0015] Furthermore, the center of the circle containing the arc-shaped groove coincides with the center of the fixed ring.

[0016] The beneficial effects of the present invention are as follows: The present invention seals the bellows to be tested by the inner support members at both ends and squeezes and fixes it with an eccentric wheel to form a sealed environment inside. It also simulates the corrosion environment by injecting salt spray into the bellows to be tested, and evaluates the changes in the mechanical properties of the bellows before and after corrosion by combining tensile testing method, so as to achieve the evaluation of the comprehensive performance of the bellows. Before injecting salt spray into the corrugated pipe to be tested, a first protective shell and a second protective shell are set on the outside of the corrugated pipe to be tested. The two shells cover the corrugated pipe to be tested, simulating the testing method of placing the outside of the corrugated pipe to be tested in a salt spray environment. At the same time, the testing area of ​​the corrugated pipe is covered to ensure that the salt spray will not leak outward after the corrugated pipe is broken, thereby achieving protection of the periphery of the testing area. After the first and second protective shells cover the corrugated pipe to be tested, the ends of the first and second protective shells are sealed by binding with rope knots to prevent salt spray leakage. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the first sliding frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the electric push rod and connecting shell of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the second sliding frame of the present invention; Figure 6 This is a three-dimensional sectional view of the fixing ring of the present invention; Figure 7 This is a three-dimensional structural cross-sectional view of the internal support member of the present invention; Figure 8 This is a three-dimensional structural diagram of the first and second connecting pipes of the present invention; Figure 9 This is a three-dimensional structural cross-sectional view of the first and second protective shells of the present invention. Figure 10 This is a three-dimensional structural diagram showing the positional relationship between the fixing ring and the elastic sleeve of the present invention; Figure 11 This is a three-dimensional structural diagram of the sliding pin and the fixed base of the present invention.

[0018] Reference numerals: 1-Operating table, 2-Electric push rod, 3-Connecting shell, 4-Connector, 401-Protective component, 402-First connecting pipe, 403-Second connecting pipe, 5-Tension detection module, 6-U-shaped frame, 7-Eccentric wheel, 8-Inner support component, 9-First protective shell, 901-Second protective shell, 10-Fixing ring, 11-Elastic sleeve, 12-Support component, 13-Electric slide rail, 14-First sliding frame, 15-Extrusion frame, 1501-Horizontal groove, 16-Guide rail, 17-Second sliding frame, 18-Guide groove, 1801-Inclined groove, 1802-Arc groove, 19-Sliding pin, 20-Fixing seat. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In this invention, all electrical components are electrically connected to the control terminal (not shown in the figure).

[0021] The technical solution proposed in this invention addresses the problem that existing technologies cannot assess changes in mechanical properties after corrosion solely through salt spray testing by employing the following steps: Two internal support members 8 seal both sides of the bellows under test, ensuring no leakage during subsequent salt spray injection and guaranteeing the controllability and sealing of the test environment. Then, an eccentric wheel 7 compresses the bellows under test, maintaining a sealed state at both ends, and salt spray is injected to simulate a real corrosion environment. After a specified salt spray reaction time, a tensile test is performed on the bellows, similar to a tensile test. This approach not only assesses the changes in the material's mechanical properties before and after corrosion but also allows for further analysis of changes in key performance indicators such as strength and ductility after corrosion.

[0022] Example 1 An instrument for testing the corrosion resistance of plastic pipes, such as... Figures 1-8 As shown, it includes an operating table 1, on which symmetrically distributed electric push rods 2 are fixedly connected. Each of the symmetrically distributed electric push rods 2 has a connecting shell 3 fixedly connected to its opposite side. A connecting member 4 is slidably connected inside the connecting shell 3. A tension detection module 5 is fixedly connected inside the connecting shell 3. The tension detection module 5 is used to detect the tension on the connecting member 4. A U-shaped frame 6 is fixedly connected to the side of the connecting member 4 away from the tension detection module 5. A symmetrically distributed eccentric wheel 7 is rotatably connected to the U-shaped frame 6. An inner support member 8 is fixedly connected to the side of the U-shaped frame 6 away from the adjacent connecting member 4. The connecting member 4 and the adjacent inner support member 8 are jointly fixedly connected to a protective member 401. A first connecting pipe 402 is fixedly connected inside the protective member 401.

[0023] In the above scheme, the electric push rod 2 is symmetrically distributed on the left and right sides of the operating table 1. The connecting shell 3 is composed of two arc-shaped shells and several bolts. The connecting part 4 is hollow on the side near the inner support 8. The inner support 8 is composed of a hollow tube and multiple rubber sleeves. The rubber sleeves are used to increase the sealing between the hollow tube and the corrugated pipe to be tested. When the corrugated pipe to be tested is sleeved on the outside of the inner support 8, the corrugated pipe to be tested is fixed by the rotation of two adjacent eccentric wheels 7. The rotation of the two adjacent eccentric wheels 7 can be done manually or electrically, and both of these driving methods can refer to the existing ones. The tensile force detection module 5 is used to detect the tensile force when the corrugated pipe is stretched. The "tensile strength" is obtained only after the corrugated pipe is broken.

[0024] like Figure 1 , Figure 3 and Figure 9As shown, a first protective shell 9 is provided on the operating table 1. The first protective shell 9 is used to cover the corrugated pipe to be tested. A second protective shell 901 is fixed inside the first protective shell 9. The second protective shell 901 is absorbent paper. The cross-sections of the first protective shell 9 and the second protective shell 901 are both wavy.

[0025] In the above scheme, the first protective shell 9 is made of silicone. The first protective shell 9 covers the corrugated pipe to be tested, so that the salt spray particles on the corrugated pipe will not fly out of the testing area after it is broken, thus achieving the effect of protecting the surrounding environment and the safety of operators. The second protective shell 901 isolates the salt spray particles and prevents the salt spray particles from splashing onto the first protective shell 9.

[0026] like Figures 5-8 As shown, a second connecting pipe 403 is fixedly connected inside the protective member 401, and one end of the second connecting pipe 403 near the adjacent inner support member 8 passes through the adjacent connecting member 4.

[0027] In the above scheme, the second connecting pipe 403 is used to deliver salt spray to the outside of the corrugated pipe to be tested, thereby simulating the corrosion-resistant environment on the outside of the corrugated pipe to be tested.

[0028] like Figure 4 , Figure 5 , Figure 10 and Figure 11 As shown, a fixing ring 10 is fixedly connected to the middle of the connector 4. A tension sleeve 11 is provided on the fixing ring 10. The tension sleeve 11 is used to bind the first protective shell 9 and the second protective shell 901 to the adjacent fixing ring 10. A support member 12 is provided inside the tension sleeve 11.

[0029] In the above scheme, when the elastic sleeve 11 contracts, it binds the first protective shell 9 and the second protective shell 901 to the adjacent fixing ring 10, thereby isolating the first protective shell 9 and the second protective shell 901 from the outside world, so that the corrugated pipe to be tested is in a closed environment. The elastic sleeve 11 is woven from hemp rope, and the support member 12 is a tough iron wire rope. By tightening the elastic sleeve 11, the ends of the first protective shell 9 and the second protective shell 901 are contracted, and the ends of the two will contact the outside of the adjacent fixing ring 10 after contraction. The support member 12 is used to increase the binding force of the elastic sleeve 11 on the ends of the first protective shell 9 and the second protective shell 901.

[0030] like Figures 1-5 , Figure 10 and Figure 11As shown, the operating table 1 is provided with symmetrically distributed electric slide rails 13, and electric sliders are provided inside the electric slide rails 13. The electric sliders in the symmetrically distributed electric slide rails 13 are all fixedly connected to a first sliding frame 14. The first sliding frame 14 is slidably connected to symmetrically distributed extrusion frames 15. The extrusion frames 15 are provided with symmetrically distributed transverse grooves 1501. The operating table 1 is provided with symmetrically distributed guide rails 16. Symmetrically distributed second sliding frames 17 are slidably connected between the symmetrically distributed guide rails 16. The second sliding frames 17 are fixedly connected to adjacent connecting parts 4. 15. The adjacent second sliding frame 17 is locked in place. The second sliding frame 17 is provided with symmetrically distributed guide grooves 18. The transverse groove 1501 is slidably connected to a sliding pin 19 that slides along the corresponding guide groove 18. The sliding pin 19 is fixedly connected to a fixed seat 20 for driving the deformation of the tension sleeve 11. The guide groove 18 is composed of a connected inclined groove 1801 and an arc groove 1802. Both the inclined groove 1801 and the arc groove 1802 are used to guide the adjacent sliding pin 19. The center of the circle where the arc groove 1802 is located coincides with the center of the fixed ring 10.

[0031] In the above scheme, the electric slide rails 13 are symmetrically distributed on the left and right sides of the operating table 1, the horizontal grooves 1501 are symmetrically distributed on the front and rear sides of the extrusion frame 15, the guide rails 16 are symmetrically distributed on the front and rear sides of the operating table 1, and when the sliding pin 19 slides along the adjacent inclined groove 1801, it pulls the tension sleeve 11 and the support member 12, causing the tension sleeve 11 and the support member 12 to contract initially. When the sliding pin 19 slides down along the adjacent arc groove 1802, it causes the tension sleeve 11 and the support member 12 to contract further.

[0032] Working principle: When the bellows needs to be inspected, the first protective shell 9 and the second protective shell 901 are compressed and fitted onto the connector 4 on either side. Then, both ends of the bellows are fixed, as detailed below: The fixing methods for both ends of the bellows are the same. Taking the fixing of the left side of the bellows as an example, the user puts the bellows to be tested onto the inner support 8 so that the inner support 8 can seal the bellows to be tested. Then the user controls the two adjacent eccentric wheels 7 to rotate, thereby fixing the bellows to be tested. After the bellows to be tested is fixed, the user stretches the first protective shell 9 and the second protective shell 901 so that the two ends of the first protective shell 9 and the second protective shell 901 are located outside the two fixing rings 10 respectively. At this time, the two ends of the first protective shell 9 and the second protective shell 901 are located inside the two tension sleeves 11 respectively. Then, the user controls the electric sliders on the two electric slide rails 13 through the control terminal to drive the first sliding frame 14 to move downward. The first sliding frame 14 drives the two pressing frames 15 to move synchronously and press the two adjacent sliding pins 19, so that the sliding pins 19 move obliquely downward along the adjacent inclined grooves 1801. During the movement of the sliding pins 19, the tension sleeves 11 and the support members 12 are pulled by the fixing seat 20, so that the middle of the tension sleeves 11 and the support members 12 is initially tightened (during the contraction of the two, the ends of the first protective shell 9 and the second protective shell 901 contract and fit with the adjacent fixing rings 10). As 19 continues to move, the sliding pin 19 slides from the inclined groove 1801 into the arc groove 1802. Under the combined action of the center of the circle where the arc groove 1802 is located and the center of the fixed ring 10, the sliding pin 19 drives the tension sleeve 11 and the support member 12 to stretch in the circumferential direction with the central axis of the fixed ring 10 as the reference. The tension sleeve 11 and the support member 12 are then bound to the outside of the first protective shell 9, thereby enhancing the compressive force applied to the first protective shell 9 and the second protective shell 901, thereby increasing the sealing between the first protective shell 9 and the second protective shell 901 and the adjacent fixed ring 10. The following effects are achieved by the above method: sealing and fixing both sides of the bellows to be tested, ensuring that there will be no leakage during subsequent salt spray injection, ensuring the controllability and sealing of the test environment, and then covering the bellows to be tested with the first protective shell 9 and the second protective shell 901 by binding, and placing the bellows to be tested in a sealed environment.

[0033] After securing and covering the corrugated pipe to be tested, the user connects the external air supply device to the first connecting pipe 402 and the second connecting pipe 403 on the left side, and the external air extraction device to the first connecting pipe 402 and the second connecting pipe 403 on the right side. The user can choose to inject salt spray into the inside or outside of the corrugated pipe to be tested, thereby achieving corrosion resistance testing of the inside and outside of the corrugated pipe. Taking the process of injecting salt spray into the inside of the corrugated pipe as an example: the external air supply device injects salt spray into the first connecting pipe 402 on the left side to simulate a real corrosion environment. The salt spray then enters the corrugated pipe. At the same time, the external air extraction device extracts excess gas from the corrugated pipe through the first connecting pipe 402 on the right side. After the excess gas is extracted, the external air extraction device is closed, making the inside of the corrugated pipe a sealed environment. Then, no more salt spray is injected into the corrugated pipe, keeping both ends of the corrugated pipe sealed.

[0034] After the bellows has reacted with the salt spray for a specified time (this time is determined by the user), the user controls the telescopic ends of both electric push rods 2 to retract via the control terminal. This causes the telescopic ends of the electric push rods 2 to move synchronously through the connecting shell 3, along with the connecting piece 4, the second sliding frame 17, the extrusion frame 15, the end of the bellows, the end of the first protective shell 9 and the second protective shell 901, and related parts. At this time, the end of the bellows, the end of the first protective shell 9 and the end of the second protective shell 901 are all stretched. During the stretching process of the bellows end, the tension detection module 5 detects the tension. In this way, the tension of the bellows is detected.

[0035] When the bellows is broken, the tensile strength detection module 5 transmits this signal to the control terminal (at which point the tensile strength of the bellows after being corroded by salt spray has been determined). The control terminal controls the telescopic ends of the two electric push rods 2 to stop moving. Then, the bellows is covered by the first protective shell 9 and the second protective shell 901, so that the salt spray particles inside the bellows will not splash out of the detection area after it is broken. The second protective shell 901 collects the flying salt spray particles for subsequent unified cleaning or treatment.

[0036] After the bellows inspection is completed, the control terminal manipulates the extension ends of the two electric push rods 2 to extend, and moves the corresponding parts of the extension ends of the electric push rods 2 to their reset positions. Then, the control terminal manipulates the electric sliders in the two electric slide rails 13 to lift the first sliding frame 14 upward. The first sliding frame 14 moves upward, causing the sliding pin 19 to move upward along the adjacent arc groove 1802 until it reaches the uppermost side of the inclined groove 1801. Through the above actions, the tension sleeve 11 and the support member 12 are reset and the binding of the first protective shell 9 and the second protective shell 901 is released. Then, the user rotates the two adjacent eccentric wheels 7 so that they no longer fix the end of the bellows. Finally, the inspected bellows and the contaminated first protective shell 9 (and the internal second protective shell 901) can be removed together for processing. When the bellows needs to be inspected again, the above actions can be repeated.

[0037] Example 2 Based on Embodiment 1, the present invention also discloses a method for easily sliding the extrusion frame 15 along the first sliding frame 14 and the second sliding frame 17 along symmetrically distributed guide rails 16, such as... Figure 3 and Figure 4 As shown, the part of the extrusion frame 15 that slides along the first sliding frame 14 is provided with a first ball bearing for reducing frictional resistance. The first ball bearing on the extrusion frame 15 is used to make it slide easily along the first sliding frame 14. The part of the second sliding frame 17 that slides along the symmetrically distributed guide rail 16 is provided with a second ball bearing for reducing frictional resistance. The second ball bearing on the second sliding frame 17 is used to make it slide easily along the symmetrically distributed guide rail 16.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the corrosion resistance of plastic pipes, characterized in that: The device includes an operating table (1), on which symmetrically distributed electric push rods (2) are fixedly connected. Each of the symmetrically distributed electric push rods (2) is fixedly connected to a connecting shell (3) on the opposite side. A connecting piece (4) is slidably connected inside the connecting shell (3). A tension detection module (5) is fixedly connected inside the connecting shell (3). The tension detection module (5) is used to detect the tension on the connecting piece (4). A U-shaped frame (6) is fixedly connected to the side of the connecting piece (4) away from the tension detection module (5). The U-shaped frame (6) is rotatably connected to symmetrically distributed eccentric wheels (7). An inner support (8) is fixedly connected to the side of the U-shaped frame (6) away from the adjacent connecting piece (4). A protective piece (401) is fixedly connected to the connecting piece (4) and the adjacent inner support (8). A first connecting pipe (402) is fixedly connected inside the protective piece (401).

2. The corrosion resistance testing device for plastic pipes according to claim 1, characterized in that: The operating table (1) is provided with a first protective shell (9), which is used to cover the corrugated pipe to be tested.

3. A corrosion resistance testing device for plastic pipes according to claim 2, characterized in that: A second protective shell (901) is fixed inside the first protective shell (9). The second protective shell (901) is absorbent paper. The cross-sections of the first protective shell (9) and the second protective shell (901) are both wavy.

4. A corrosion resistance testing device for plastic pipes according to claim 1, characterized in that: The protective member (401) has a second connecting pipe (403) fixedly connected inside, and the end of the second connecting pipe (403) near the adjacent inner support member (8) passes through the adjacent connector (4).

5. A corrosion resistance testing device for plastic pipes according to claim 3, characterized in that: A fixing ring (10) is fixedly connected to the middle of the connector (4), and an elastic sleeve (11) is provided on the fixing ring (10). The elastic sleeve (11) is used to bind the first protective shell (9) and the second protective shell (901) to the adjacent fixing ring (10).

6. A corrosion resistance testing device for plastic pipes according to claim 5, characterized in that: The elastic sleeve (11) is provided with a support member (12).

7. A corrosion resistance testing device for plastic pipes according to claim 5, characterized in that: The operating table (1) is provided with symmetrically distributed electric slide rails (13), and electric sliders are provided in the electric slide rails (13). The electric sliders in the symmetrically distributed electric slide rails (13) are fixedly connected to a first sliding frame (14). The first sliding frame (14) is slidably connected to symmetrically distributed extrusion frames (15). The extrusion frames (15) are provided with symmetrically distributed transverse grooves (1501). The operating table (1) is provided with symmetrically distributed guide rails (16), and the symmetrically distributed guide rails (16) slide between each other. A symmetrically distributed second sliding frame (17) is connected, the second sliding frame (17) is fixedly connected to the adjacent connecting member (4), the pressing frame (15) locks the adjacent second sliding frame (17), the second sliding frame (17) is provided with symmetrically distributed guide grooves (18), the transverse groove (1501) is limited and slidably connected to a sliding pin (19) that slides along the corresponding guide groove (18), the sliding pin (19) is fixedly connected to a fixing seat (20) for driving the deformation of the elastic sleeve (11).

8. A corrosion resistance testing device for plastic pipes according to claim 7, characterized in that: The extrusion frame (15) is provided with a first ball bearing for lubrication at the part that slides along the first sliding frame (14), and the second sliding frame (17) is provided with a second ball bearing for lubrication at the part that slides along the symmetrically distributed guide rails (16).

9. A corrosion resistance testing device for plastic pipes according to claim 7, characterized in that: The guide groove (18) is composed of a connected inclined groove (1801) and an arc groove (1802), both of which are used to guide the adjacent sliding pin (19).

10. A corrosion resistance testing device for plastic pipes according to claim 9, characterized in that: The center of the circle in which the arc groove (1802) is located coincides with the center of the fixed ring (10).

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