A kind of corrosion resistance detection equipment for plastic pipe

Abstract

The application belongs to the technical field of corrosion resistance detection equipment, and relates to a corrosion resistance detection equipment for plastic pipes. The equipment comprises an operation table, symmetrical electric push rods fixedly connected to the operation table, connecting shells fixedly connected to opposite sides of the symmetrical electric push rods, connecting pieces slidably connected in the connecting shells, tension detection modules fixedly connected in the connecting shells, U-shaped frames fixedly connected to one side of the connecting pieces away from the tension detection modules, eccentric wheels rotatably connected to the U-shaped frames, and inner supporting pieces fixedly connected to one side of the U-shaped frames away from the adjacent connecting pieces. The application seals the corrugated pipe to be detected by the inner supporting pieces at both ends, and extrudes and fixes the corrugated pipe to be detected by the eccentric wheels, so that a sealed environment is formed in the corrugated pipe to be detected. The application simulates a corrosion environment by injecting salt mist into the corrugated pipe to be detected, and evaluates the mechanical property change of the corrugated pipe before and after corrosion by combining with the tension detection method, so as to realize the evaluation of the comprehensive performance of the corrugated pipe.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of corrosion resistance detection equipment, in particular to corrosion resistance detection equipment for plastic pipes. BACKGROUND

[0002] In the application process of new material plastic pipes, especially in harsh environmental conditions, the 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. In the test, the specimen is exposed to a closed environment with high temperature, high humidity and high salt content to simulate the corrosion conditions in the ocean or salt-containing air. During the test process, changes in the material surface, such as discoloration, blistering, cracking and peeling, can be observed to judge the corrosion resistance of the material.

[0003] Corrugated pipes, as a kind of plastic pipe with special structure, are widely used in drainage systems, cable protection, automobile parts and other fields due to their good flexibility and pressure resistance. However, due to the uneven corrugated structure on the surface, the durability of corrugated pipes in corrosive environments is more challenging than that of ordinary plastic pipes.

[0004] In the prior art, the corrosion resistance detection of plastic corrugated pipes mainly relies on salt spray test, that is, the corrugated pipe is placed in a salt spray test chamber to simulate the corrosion environment, and the surface changes or mass loss are observed. However, this method can only reflect the surface corrosion of the material under static conditions and cannot evaluate the changes in mechanical properties after corrosion, especially the performance under mechanical load in actual use, lacking a comprehensive evaluation of the overall performance. SUMMARY

[0005] To solve the problems raised in the background art, the application provides a corrosion resistance detection equipment for plastic pipes.

[0006] The technical implementation scheme of the application is: a corrosion resistance detection equipment for plastic pipes, comprising an operation table, the operation table is fixedly connected with symmetrical electric push rods, the opposite sides of the symmetrical electric push rods are fixedly connected with connecting shells, the connecting shells are slidably connected with connecting pieces, the connecting shells are fixedly connected with tension detection modules, the tension detection modules are used for detecting the tension received by the connecting pieces, the side of the connecting piece away from the tension detection module is fixedly connected with a U-shaped frame, the U-shaped frame is rotatably connected with symmetrical eccentric wheels, the side of the U-shaped frame away from the adjacent connecting piece is fixedly connected with an inner support piece, the connecting piece and the adjacent inner support piece are fixedly connected with a protection piece, and the protection piece is fixedly connected with a first communication pipe.

[0007] Further, the operating table is provided with a first protective shell, which is used to cover the corrugated pipe to be detected.

[0008] Further, the first protective shell is fixedly connected with a second protective shell, which is water-absorbing paper, and the cross sections of the first protective shell and the second protective shell are both wavy.

[0009] Further, the protective member is fixedly connected with a second communication pipe, which passes through the adjacent connecting member near one end of the adjacent inner support member.

[0010] Further, the middle part of the connecting member is fixedly connected with a fixing ring, and the fixing ring is provided with an elastic sleeve, which is used to bundle the first protective shell and the second protective shell to the adjacent fixing ring.

[0011] Further, the elastic sleeve is provided with a support member.

[0012] Further, the operating table is provided with symmetrically distributed electric sliding rails, the electric sliding rails are provided with electric sliding blocks, the electric sliding blocks symmetrically distributed in the electric sliding rails are fixedly connected with a first sliding frame, the first sliding frame is slidingly connected with symmetrically distributed extrusion frames, the extrusion frames are provided with symmetrically distributed transverse grooves, the operating table is provided with symmetrically distributed guide rails, the symmetrically distributed guide rails are slidingly connected with symmetrically distributed second sliding frames, the second sliding frames are fixedly connected with the adjacent connecting members, the extrusion frames clamp the adjacent second sliding frames, the second sliding frames are provided with symmetrically distributed guide grooves, the transverse grooves are limitingly and slidingly connected with sliding pins sliding along the corresponding guide grooves, and the sliding pins are fixedly connected with fixing seats for driving the elastic sleeve to deform.

[0013] Further, the extrusion frames are provided with first balls for lubrication at the positions sliding along the first sliding frame, and the second sliding frames are provided with second balls for lubrication at the positions sliding along the symmetrically distributed guide rails.

[0014] Further, the guide groove is composed of a connecting inclined groove and an arc-shaped groove, and the inclined groove and the arc-shaped groove are both used for guiding the adjacent sliding pin.

[0015] Further, the center of the circle where the arc-shaped groove is located coincides with the center of the fixing ring.

[0016] The present application has the following advantages: the present application seals the corrugated pipe to be detected by the inner support members at both ends, and uses the eccentric wheel to extrude and fix, so that a sealed environment is formed in the corrugated pipe, and the salt mist is injected into the corrugated pipe to be detected to simulate the corrosion environment, and the mechanical property change of the corrugated pipe before and after corrosion is evaluated by the tensile test method, so as to realize the evaluation of the comprehensive performance of the corrugated pipe.

[0017] Before injecting the salt fog into the to-be-detected corrugated pipe, a first protective shell and a second protective shell are arranged outside the to-be-detected corrugated pipe, and the to-be-detected corrugated pipe is caged by the first protective shell and the second protective shell, so that the detection area of the corrugated pipe is caged while the detection mode of placing the to-be-detected corrugated pipe outside in the salt fog environment is simulated, so as to ensure that the salt fog does not leak outwards after the corrugated pipe is pulled off, and thus the protection of the periphery of the detection area is realized.

[0018] After the first protective shell and the second protective shell cage the to-be-detected corrugated pipe, the two ends of the first protective shell and the second protective shell are sealed by the knot binding mode, so as to prevent the salt fog from leaking. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective structural schematic view of the present application;

[0020] Figure 2 It is a perspective structural schematic view of the present application from another angle;

[0021] Figure 3 It is a perspective structural sectional view of the first sliding frame of the present application;

[0022] Figure 4 It is a perspective structural schematic view of the electric push rod and the connecting shell of the present application;

[0023] Figure 5 It is a perspective structural sectional view of the second sliding frame of the present application;

[0024] Figure 6 It is a perspective structural sectional view of the fixed ring of the present application;

[0025] Figure 7 It is a perspective structural sectional view of the inner supporting piece of the present application;

[0026] Figure 8 It is a perspective structural schematic view of the first communication pipe and the second communication pipe of the present application;

[0027] Figure 9 It is a perspective structural sectional view of the first protective shell and the second protective shell of the present application;

[0028] Figure 10 It is a perspective structural schematic view of the position relationship between the fixed ring and the elastic sleeve of the present application;

[0029] Figure 11 It is a perspective structural schematic view of the sliding pin and the fixed seat of the present application.

[0030] Mark No. : 1 - operation platform, 2 - electric push rod, 3 - connecting shell, 4 - connecting piece, 401 - protection piece, 402 - first communication pipe, 403 - second communication pipe, 5 - tension detection module, 6 - U-shaped frame, 7 - eccentric wheel, 8 - inner support piece, 9 - first protection shell, 901 - second protection shell, 10 - fixed ring, 11 - elastic sleeve, 12 - support piece, 13 - electric sliding 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-shaped groove, 19 - sliding pin, 20 - fixed seat. DETAILED DESCRIPTION

[0031] The application will be further described below in combination with the drawings and examples.

[0032] All electrical elements in the application are electrically connected with a control terminal (not shown in the figure).

[0033] The technical scheme provided in the application solves the problem in the prior art that the mechanical property change after corrosion cannot be evaluated only by relying on salt spray test by the following steps: two inner support pieces 8 are used to seal the two sides of the corrugated pipe to be detected, so as to ensure that the subsequent salt spray injection will not leak, and to ensure the controllability and sealing property of the test environment, then the eccentric wheel 7 is used to extrude the corrugated pipe to be detected, so that the two ends of the corrugated pipe to be detected remain in a sealed state, and salt spray is injected into the corrugated pipe to be detected, so as to simulate a real corrosion environment, after a specified time of salt spray reaction, the corrugated pipe is subjected to tension detection by referring to the tension detection mode, so that not only the mechanical property change of the material before and after corrosion can be evaluated, but also the change of key performance indicators such as the strength and ductility of the corrugated pipe after corrosion can be further analyzed.

[0034] Example 1

[0035] A kind of corrosion resistance detection equipment for plastic pipe, as shown in Figures 1-8 It includes operation platform 1, operation platform 1 is fixedly connected with symmetrically distributed electric push rod 2, the opposite sides of symmetrically distributed electric push rod 2 are fixedly connected with connecting shell 3, connecting shell 3 is slidably connected with connecting piece 4, connecting shell 3 is fixedly connected with tension detection module 5, tension detection module 5 is used to detect the tension received by connecting piece 4, the side of connecting piece 4 away from tension detection module 5 is fixedly connected with U-shaped frame 6, U-shaped frame 6 is rotatably connected with symmetrically distributed eccentric wheel 7, the side of U-shaped frame 6 away from adjacent connecting piece 4 is fixedly connected with inner support piece 8, connecting piece 4 and adjacent inner support piece 8 are fixedly connected with protection piece 401, protection piece 401 is fixedly connected with first communication pipe 402.

[0036] In the above scheme, the electric push rod 2 is symmetrically distributed on the left and right sides of the operation table 1, the connecting shell 3 is connected by two arc-shaped shells and a plurality of bolts, the connecting piece 4 is hollow near one side of the inner support piece 8, the inner support piece 8 is composed of a hollow pipe and a plurality of rubber sleeves, the rubber sleeves are used to increase the sealing of the hollow pipe and the to-be-detected corrugated pipe, when the to-be-detected corrugated pipe is sleeved on the outer side of the inner support piece 8, the to-be-detected corrugated pipe is fixed through the rotation of the adjacent two eccentric wheels 7, the rotation of the adjacent two eccentric wheels 7 can be driven manually or electrically, and both driving modes can be referred to the existing, the tension detection module 5 is used to detect the tension of the corrugated pipe when it is stretched, and the "tensile strength" can be obtained when the corrugated pipe is broken.

[0037] As shown in Figure 1 , Figure 3 and Figure 9 , the operation table 1 is provided with a first protective shell 9, the first protective shell 9 is used to cover the to-be-detected corrugated pipe, and a second protective shell 901 is fixedly connected in the first protective shell 9, the second protective shell 901 is water-absorbing paper, and the cross sections of the first protective shell 9 and the second protective shell 901 are both wave-shaped.

[0038] In the above scheme, the first protective shell 9 is made of silica gel, the to-be-detected corrugated pipe is covered by the first protective shell 9, so that the salt mist particles on the to-be-detected corrugated pipe will not fly out of the detection area after being broken, thereby achieving the effect of protecting the surrounding environment and the safety of the operator, and the second protective shell 901 isolates the salt mist particles to prevent the salt mist particles from splashing to the first protective shell 9.

[0039] As shown in Figures 5-8 , the second communication pipe 403 is fixedly connected in the protective piece 401, and one end of the second communication pipe 403 near the adjacent inner support piece 8 penetrates through the adjacent connecting piece 4.

[0040] In the above scheme, the second communication pipe 403 is used to transport salt mist to the outside of the to-be-detected corrugated pipe, so as to simulate the corrosion-resistant environment outside the to-be-detected corrugated pipe.

[0041] As shown in Figure 4 , Figure 5 , Figure 10 and Figure 11 , the middle part of the connecting piece 4 is fixedly connected with a fixing ring 10, the fixing ring 10 is provided with an elastic sleeve 11, the elastic sleeve 11 is used to bundle the first protective shell 9 and the second protective shell 901 to the adjacent fixing ring 10, and the elastic sleeve 11 is provided with a supporting piece 12.

[0042] In the above scheme, the first protective shell 9 and the second protective shell 901 are bundled to the adjacent fixed ring 10 by the shrinkage of the elastic sleeve 11, thereby isolating the first protective shell 9 and the second protective shell 901 from the outside, so that the corrugated pipe to be detected is in a closed environment, the elastic sleeve 11 is woven by hemp rope, the supporting member 12 is a wire rope with toughness, the end portions of the first protective shell 9 and the second protective shell 901 are shrunk by the tightening of the elastic sleeve 11, and the end portions of the first protective shell 9 and the second protective shell 901 contact the outer side of the adjacent fixed ring 10 after being shrunk, and the supporting member 12 is used to increase the bundling force of the elastic sleeve 11 on the end portions of the first protective shell 9 and the second protective shell 901.

[0043] As shown in Figures 1-5 , Figure 10 and Figure 11 , the operation table 1 is provided with symmetrically distributed electric sliding rails 13, the electric sliding rails 13 are provided with electric sliding blocks, the electric sliding blocks in the symmetrically distributed electric sliding rails 13 are fixedly connected together, the first sliding frame 14 is slidably connected with symmetrically distributed extrusion frames 15, the extrusion frames 15 are provided with symmetrically distributed transverse grooves 1501, the operation table 1 is provided with symmetrically distributed guide rails 16, the symmetrically distributed guide rails 16 are slidably connected with symmetrically distributed second sliding frames 17, the second sliding frames 17 are fixedly connected with the adjacent connecting members 4, the extrusion frames 15 clamp the adjacent second sliding frames 17, the second sliding frames 17 are provided with symmetrically distributed guide grooves 18, the transverse grooves 1501 are limitingly and slidably connected with sliding pins 19 which slide along the corresponding guide grooves 18, the sliding pins 19 are fixedly connected with fixing seats 20 which are used to drive the deformation of the elastic sleeve 11, the guide grooves 18 are composed of connected inclined grooves 1801 and arc grooves 1802, the inclined grooves 1801 and the arc grooves 1802 are used to guide the adjacent sliding pins 19, and the center of the circle in which the arc grooves 1802 are located coincides with the center of the fixed ring 10.

[0044] In the above scheme, the electric sliding rails 13 are symmetrically distributed on the left and right sides of the operation table 1, the transverse grooves 1501 are symmetrically distributed on the front and back sides of the extrusion frames 15, the guide rails 16 are symmetrically distributed on the front and back sides of the operation table 1, and when the sliding pins 19 slide along the adjacent inclined grooves 1801, the elastic sleeve 11 and the supporting member 12 are pulled, so that the elastic sleeve 11 and the supporting member 12 are initially shrunk, and when the sliding pins 19 slide downward along the adjacent arc grooves 1802, the elastic sleeve 11 and the supporting member 12 are further shrunk.

[0045] Working principle: when the corrugated pipe needs to be detected, the first protective shell 9 and the second protective shell 901 are compressed and sleeved to the connecting member 4 on any one side, and then the two ends of the corrugated pipe are fixed, the details are as follows:

[0046] The fixing mode of the two ends of the bellows is consistent, and the left side of the bellows is taken as an example. The user puts the bellows to be detected into the inner support 8, so that the inner support 8 seals the bellows to be detected, and then the user controls the rotation of the two adjacent eccentric wheels 7, so as to fix the bellows to be detected.

[0047] When the fixing of the bellows to be detected is completed, 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 fixed rings 10. At this time, the two ends of the first protective shell 9 and the second protective shell 901 are located in the two elastic sleeves 11, respectively. Then, the terminal control device drives the first sliding frame 14 to move downward by driving the electric sliding block on the electric sliding rail 13, and the first sliding frame 14 drives the two extrusion frames 15 to move synchronously and extrude the adjacent sliding pins 19, so that the sliding pins 19 move obliquely downward along the adjacent inclined grooves 1801. In the process of moving, the sliding pins 19 pull the elastic sleeves 11 and the supporting members 12 through the fixed seats 20, so that the elastic sleeves 11 and the supporting members 12 are preliminarily tightened in the middle part (in the process of contraction, the ends of the first protective shell 9 and the second protective shell 901 are contracted and attached to the adjacent fixed rings 10). With the continuous movement of the sliding pins 19, the sliding pins 19 slide into the arc-shaped grooves 1802 from the inclined grooves 1801. Under the action of the centers of the circles where the arc-shaped grooves 1802 are located and the centers of the fixed rings 10, the sliding pins 19 are stretched along the circumferential direction with the center axis of the fixed ring 10 as the reference, so as to drive the elastic sleeves 11 and the supporting members 12 to be stretched outside the first protective shell 9. In this way, the extrusion force applied to the first protective shell 9 and the second protective shell 901 is increased, so as to increase the sealing property between the first protective shell 9 and the second protective shell 901 and the adjacent fixed rings 10. The above-mentioned mode realizes the following effects: the two sides of the bellows to be detected are sealed and fixed, so as to ensure that the salt mist is not leaked when injected later, and the controllability and sealing property of the test environment are ensured. Then, the first protective shell 9 and the second protective shell 901 cover the bellows to be detected by the binding mode, and the bellows to be detected is in a sealed environment.

[0048] After the fixation and the cage cover of the to-be-tested corrugated pipe are completed, the user connects the external air supply device with the left first communication pipe 402 and the left second communication pipe 403, and connects the external air extraction device with the right first communication pipe 402 and the right second communication pipe 403, and the user can select to inject salt mist into the inside or the outside of the to-be-tested corrugated pipe, so as to realize the corrosion resistance detection of the inside and the outside of the to-be-tested corrugated pipe. Taking the process of injecting salt mist into the inside of the to-be-tested corrugated pipe as an example: the external air supply device injects salt mist into the left first communication pipe 402 to simulate a real corrosion environment, and the salt mist enters the corrugated pipe at the same time. Meanwhile, the external air extraction device extracts the excess gas in the corrugated pipe through the right first communication pipe 402, and closes (the external air extraction device) after the excess gas is extracted, so that the corrugated pipe is in a sealed environment, and then no salt mist is injected into the corrugated pipe, so that the two ends of the corrugated pipe are kept sealed.

[0049] After the corrugated pipe reacts with the salt mist for a specified time (the time is determined by the user), the user controls the extension and retraction ends of the two electric push rods 2 to be retracted through the control terminal, so that the extension and retraction ends of the electric push rods 2 drive the connecting piece 4, the second sliding frame 17, the extrusion frame 15, the end of the corrugated pipe, the end of the first protective shell 9 and the second protective shell 901, and the related parts to move synchronously. At this time, the end of the corrugated pipe, the end of the first protective shell 9 and the second protective shell 901 are stretched, and the tension detection module 5 detects the tension during the stretching of the end of the corrugated pipe. Through the above-mentioned way, the tension detection of the corrugated pipe is realized.

[0050] When the corrugated pipe is pulled off, the tension detection module 5 transmits the signal to the control terminal (at this time, the tensile strength of the corrugated pipe after being corroded by the salt mist is obtained), and the control terminal controls the extension and retraction ends of the two electric push rods 2 to stop moving. Then, the first protective shell 9 and the second protective shell 901 cage the corrugated pipe, so that the salt mist particles in the corrugated pipe after being pulled off do not splash out of the detection area, and the second protective shell 901 collects the splashed salt mist particles, so as to facilitate subsequent unified cleaning or processing.

[0051] When the detection of the bellows is completed, the control terminal controls the extension of the extension end of the two electric push rods 2, and moves the corresponding parts of the extension end of the electric push rod 2 to reset, and then controls the electric sliding block in the two electric sliding rails 13 to drive the first sliding frame 14 to lift upward, the first sliding frame 14 moves upward, the sliding pin 19 moves upward along the adjacent arc-shaped groove 1802 until it moves to the uppermost side of the inclined groove 1801, through the above-mentioned action, the loose sleeve 11 and the supporting part 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 adjacent two eccentric wheels 7, so that they no longer fix the end of the bellows, finally the bellows after detection and the contaminated first protective shell 9 (and the second protective shell 901 inside) are removed and handled, and when the bellows needs to be detected again, the above-mentioned action is repeated.

[0052] Embodiment 2

[0053] On the basis of embodiment 1, the application further discloses a way to make the extrusion frame 15 easily slide along the first sliding frame 14 and the second sliding frame 17 easily slide along the symmetrically distributed guide rail 16, as shown in Figure 3 and Figure 4 The part where the extrusion frame 15 slides along the first sliding frame 14 is provided with first balls for reducing frictional resistance, the first balls on the extrusion frame 15 are used to make it easily slide along the first sliding frame 14, and the part where the second sliding frame 17 slides along the symmetrically distributed guide rail 16 is provided with second balls for reducing frictional resistance, the second balls on the second sliding frame 17 are used to make it easily slide along the symmetrically distributed guide rail 16.

[0054] Finally, it should be noted that: the above-mentioned is only the preferred embodiment of the application, and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application, should be included in the protection scope of the application.

Claims

1. A corrosion resistance testing apparatus for plastic pipes, characterized by: The utility model provides an operation platform (1) is fixed with symmetrical distribution electric push rod (2), and the opposite side of symmetrical distribution electric push rod (2) is fixed with connecting shell (3), and the connecting shell (3) is slidably connected with connecting piece (4), and the connecting shell (3) is fixed with tension detection module (5), and tension detection module (5) is used for detecting the tension that connecting piece (4) receives, and the side of connecting piece (4) away from tension detection module (5) is fixed with U -shaped frame (6), and U -shaped frame (6) is rotatably connected with symmetrical distribution eccentric wheel (7), and the side of U -shaped frame (6) away from adjacent connecting piece (4) is fixed with inner support (8), and connecting piece (4) and adjacent inner support (8) are commonly fixed with protection piece (401), and the first communication pipe (402) is fixed in protection piece (401);First protection shell (9) is arranged on the operation platform (1), and first protection shell (9) is used to cover the corrugated pipe to be detected; Second protection shell (901) is fixed in first protection shell (9), and second protection shell (901) is water absorption paper, and the cross section of first protection shell (9) and second protection shell (901) is wave-shaped; Second communication pipe (403) is fixed in protection piece (401), and one end of second communication pipe (403) is passed through adjacent connecting piece (4); The middle part of connecting piece (4) is fixed with fixed ring (10), and loose sleeve (11) is arranged on fixed ring (10), and loose sleeve (11) is used for binding first protection shell (9) and second protection shell (901) to adjacent fixed ring (10); Supporting piece (12) is arranged in loose sleeve (11); The operation platform (1) is provided with symmetrical distribution electric slide rail (13), and the electric slide rail (13) is provided with an electric sliding block, and the electric sliding blocks in the symmetrical distribution electric slide rail (13) are commonly fixed with a first sliding frame (14), and the first sliding frame (14) is slidably connected with symmetrical distribution extrusion frame (15), and the extrusion frame (15) is provided with symmetrical distribution transverse grooves (1501), and the operation platform (1) is provided with symmetrical distribution guide rails (16), and the symmetrical distribution guide rails (16) are slidably connected with symmetrical distribution second sliding frames (17), and the second sliding frames (17) are fixed with adjacent connecting pieces (4), and the extrusion frame (15) clamps adjacent second sliding frames (17), and the second sliding frames (17) are provided with symmetrical distribution guide grooves (18), and the transverse grooves (1501) are limitingly and slidably connected with sliding pins (19) sliding along the corresponding guide grooves (18), and the sliding pins (19) are fixed with fixed seats (20) for driving the deformation of the loose sleeve (11). The guide groove (18) is composed of a connecting inclined groove (1801) and an arc-shaped groove (1802), and the inclined groove (1801) and the arc-shaped groove (1802) are used for guiding the adjacent sliding pins (19). The center of the circle where the arc-shaped groove (1802) is located coincides with the center of the fixed ring (10).

2. The corrosion resistance testing apparatus for plastic pipes according to claim 1, characterized in that: The part where the extrusion frame (15) slides along the first sliding frame (14) is provided with first balls for lubrication, and the part where the second sliding frame (17) slides along the symmetrically distributed guide rails (16) is provided with second balls for lubrication.

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