Endurance test equipment for automobile sealing strip

Abstract

The invention discloses durability test equipment for an automobile sealing strip, and relates to the technical field of sealing performance testing, the durability test equipment comprises a cylindrical shell, extrusion wheels are correspondingly arranged on the two sides of the cylindrical shell, the two extrusion wheels located on one side of the cylindrical shell are symmetrically arranged up and down, and an electric telescopic rod is installed on one side of each extrusion wheel. A fixing frame is connected to one end of the electric telescopic rod, tightening discs are correspondingly arranged on the two sides of the cylindrical shell, tightening ropes are wound around the tightening discs, clamping heads are installed at one ends of the tightening ropes, the extrusion wheels are driven by external torque to rotate, and rotating shafts are rotatably installed on the inner wall of the cylindrical shell in an up-down corresponding mode; a contact ball is fixedly installed outside the rotating shaft, an annular groove is formed in the middle of the contact ball, connecting shells are correspondingly and fixedly installed on the upper inner wall and the lower inner wall of the cylindrical shell, openings are formed in the bottoms of the connecting shells, and the bottoms of the connecting shells are in sliding contact with the annular groove.

Description

Technical Field

[0001] The invention relates to the technical field of sealing test, in particular to a durability test device for automobile sealing strips. Background Art

[0002] The cylinder head of the automobile engine is connected to the cylinder body through a sealing strip, which is used to prevent the high-temperature, high-pressure combustion gas in the cylinder from leaking to the outside to avoid power loss and emission pollution. When the engine is working, the gas in the cylinder generates extremely high temperature and pressure due to combustion, and the compressed air and fuel form a mixed gas, which will cause the cylinder wall and the surrounding sealing strips to frequently deform due to thermal expansion and contraction. The sealing strip needs to be tested for sealing during production and research and development to determine its service life.

[0003] The engine will produce oil when it is running, so the car sealing strip will be immersed in oil for a long time when it is used. However, the existing test methods often only test the compression deformation and oil environment. If the two are tested together, they need to be tested separately when verifying the sealing performance, which will delay the test efficiency and cannot accurately know how many times the compression will cause the sealing to be damaged. Therefore, it is necessary to design a durability test equipment for automobile sealing strips. Summary of the invention

[0004] The object of the present invention is to provide a durability test device for automobile sealing strips to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a durability test device for an automobile sealing strip, comprising a cylindrical shell, extrusion wheels are correspondingly arranged on both sides of the cylindrical shell, and the two extrusion wheels on one side of the cylindrical shell are symmetrically arranged up and down, an electric telescopic rod is installed on one side of the extrusion wheel, one end of the electric telescopic rod is connected to a fixed frame, tightening disks are correspondingly arranged on both sides of the cylindrical shell, a tightening rope is wound around the tightening disk, and a clamping head is installed on one end of the tightening rope, and the extrusion wheel is driven to rotate by an external torque. When the extrusion wheel is driven to rotate, the automobile sealing strip will translate left and right to extrude different parts of itself, simulating the frequent deformation of the cylinder wall and surrounding sealing strips due to thermal expansion and contraction when the automobile engine cylinder block is in use. When the automobile sealing strip translates to the position where the clamping head is close to the extrusion wheel, the electric telescopic rod is driven to shrink. At this time, the two clamping heads are separated from the automobile sealing strip, so the clamping heads will pass through the extrusion wheel. When the automobile sealing strip moves in parallel, its different positions will pass through the inside of the cylindrical shell. The inside of the cylindrical shell is filled with organic oil to simulate the situation that the engine will produce oil when it is running, so that the automobile sealing strip will be immersed in oil for a long time when it is used, and then the durability test of the automobile sealing strip is carried out. The tightening disk is used to provide a constant pulling force when the automobile sealing strip needs to be retracted to the position of the tightening disk, which facilitates the retraction of the clamping head and limits the feeding direction of the automobile sealing strip.

[0006] According to the above technical solution, the inner wall of the cylindrical shell is correspondingly rotatably mounted with a rotating shaft on the upper and lower sides, a contact ball is fixedly mounted on the outside of the rotating shaft, an annular groove is provided in the middle of the contact ball, a connecting shell is fixedly mounted on the upper and lower inner walls of the cylindrical shell, the bottom of the connecting shell is open, and the bottom of the connecting shell and the annular groove are in sliding contact with each other, a thin flow channel is provided inside the contact ball, and the connecting shell and the thin flow channel are interpenetrating and matched with each other. When the automobile sealing strip moves laterally, its upper and lower sides are respectively in contact with the annular grooves of the upper and lower contact balls, and the thin flow channel is used to pump chemical liquids that react with each other onto the sealing strip, and the two chemical liquids will react with each other only when cracks are generated in the sealing strip.

[0007] According to the above technical solution, a one-way valve is provided inside the thin channel, one end of the thin channel is connected with a liquid channel, an expansion channel is opened in the middle of the liquid channel, a mounting block is fixedly installed on the inner wall of the liquid channel, one side of the mounting block is connected to a spring, one end of the spring is connected to a blocking block, and the outer wall of the blocking block is in sliding contact with the inner wall of the liquid channel. When liquid is pumped, the liquid will first enter the thin flow channel, then enter the liquid channel, and finally flow out from the other end. The one-way valve is used to prevent the reverse flow of the liquid and enhance the sealing of the contact ball. When the liquid channel is not vertically downward, that is, not in close contact with the automobile sealing strip, the spring force and the pressure of liquid pumping are balanced with each other, and the blocking block just blocks the liquid channel to prevent the internal reactant from flowing out. Only when the liquid channel is vertically downward, due to the gravity of the blocking block itself, the reverse effect of the inner wall of the liquid channel is lost, and the gravity causes the blocking block to move downward a certain distance. The blocking block and the expansion channel are flush with each other. At this time, the liquid can flow out from the gap between the expansion channel and the blocking block. Therefore, the liquid channel is sealed when it is not in close contact with the automobile sealing strip. When the liquid channel is in close contact with the automobile sealing strip, the liquid is conducted to prevent the internal reactant from contacting with the engine oil inside the cylindrical shell, maintain the sealing inside the contact ball, and make the sealing detection and engine oil immersion not interfere with each other.

[0008] According to the above technical solution, one end of the connecting shell located above the cylindrical shell is connected to an upper pipeline, one end of which is connected to a reactant supply end 1, and one end of the connecting shell located below the cylindrical shell is connected to a lower pipeline, one end of which is connected to a reactant supply end 2, and pumping pumps are provided on both the upper pipeline and the lower pipeline. Reactant 1 and reactant 2 are acidic liquid and alkaline liquid that react to generate a large amount of carbon dioxide. Under normal circumstances, due to the obstruction of the automobile sealing strip, the acidic liquid and the alkaline liquid cannot contact and react. When the automobile sealing strip cracks, a conductive liquid flow channel is formed between the upper and lower parts, and the acidic liquid and the alkaline liquid are able to contact and release gas. The gas will quickly open the crack until the automobile sealing strip breaks. At this time, it can be clearly known which extrusion caused the sealing failure. Compared with the existing sealing test method, it can quickly respond to the sealing failure, closely combine the test with the detection, and improve the detection efficiency and accuracy. The pumping pump is used to pump the two reactants, and the pumped liquid will pass through the connecting shell into the inside of the thin channel.

[0009] According to the above technical solution, the inner walls of both sides of the cylindrical shell are fixed with bearing frames by welding, and one side of the bearing frame is provided with a toggle blade that rotates uniformly in a circle, and one side of the toggle blade contacts the outer walls of the upper and lower contact balls. When the automobile sealing strip moves, the contact ball will rotate, and the rotation of the contact ball will cause the toggle blade in contact with one side to be subjected to a lateral force, thereby driving the toggle blade to rotate around the rotating part on the bearing frame. The toggle blade is used to drive the oil on both sides of the sealing strip to feed and flow. Since the automobile sealing strip and the contact ball will generate heat after a long period of friction, the flow of the oil will take away part of the heat, so that the temperature of the automobile sealing strip can be cooled to prevent it from being deformed due to high temperature and thus affecting the actual detection life.

[0010] According to the above technical solution, one side of the cylindrical shell is connected to a Roots pump through a pipeline, one end of the Roots pump is connected to a heat exchanger, and the heat exchanger is connected to the other side of the cylindrical shell through a pipeline. The lubricating oil driven by the moving blades will flow to one side of the cylindrical shell, and will be pumped to the Roots pump through the pipeline, and will be cooled by the heat exchanger to realize the cooling cycle of the engine oil and ensure the temperature stability of the engine oil.

[0011] According to the above technical solution, through holes are provided on both sides of the cylindrical shell, and guide blocks are installed at the through holes, and sealing rings are provided on the inner walls of the guide blocks. When the automobile sealing strip moves to the outside of the cylindrical shell, it is guided by the guide blocks, and the lubricating oil on it is removed by the sealing ring to prevent the lubricating oil from being brought out of the cylindrical shell by the automobile sealing strip.

[0012] According to the above technical solution, the expansion channel in the contact ball located above the cylindrical shell is located outside the blocking block, and the expansion channel in the contact ball located below the cylindrical shell is located inside the blocking block. Since the upper reactant is pumped downward, and the lower reactant is pumped upward, the lower blocking block will always move from the liquid channel to the expansion channel when falling downward, so that the flow direction of the liquid is maintained.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing structures such as contact balls and extrusion wheels, squeezes the automobile sealing strip at both ends to simulate actual use, and then sends it into a cylindrical shell for a sealing test; when cracks occur on the automobile sealing strip, the two chemical reactants can contact and generate a large amount of gas, breaking the sealing strip to intuitively and quickly reflect the sealing failure of the sealing strip; due to the infiltration of the lubricating oil in the cylindrical shell, the equipment combines the sealing inspection link with the compression deformation and the engine oil environment, effectively simulating the actual use scenario; since the sealing test is performed synchronously after each extrusion, it can be accurately known how many times the sealing is damaged after being squeezed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of a cylindrical shell of the present invention;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the cylindrical shell of the present invention;

[0018] Figure 4 is a schematic diagram of the cross-sectional structure of the contact ball of the present invention;

[0019] Figure 5 It is a schematic diagram of the installation of the cylindrical shell of the present invention;

[0020] Figure 6 It is a schematic diagram of the installation of the toggle blade of the present invention from the side view;

[0021] Figure 7 is a top view of a cylindrical shell of the present invention;

[0022] 1. Cylindrical shell; 21. Extrusion wheel; 22. Electric telescopic rod; 23. Fixed frame; 31. Tightening disk; 32. Clamping head; 12. Rotating shaft; 13. Contact ball; 131. Annular groove; 14. Connecting shell; 15. Upper pipeline; 151. Reactant supply end 1; 16. Lower pipeline; 161. Reactant supply end 2; 17. Pumping pump; 132. Liquid channel; 133. Blocking block; 134. Spring; 135. Mounting block; 136. Fine flow channel; 137. Expansion channel; 138. One-way valve; 18. Toggle blade; 181. Bearing frame; 41. Guide block; 411. Sealing ring; 42. Roots pump; 43. Heat exchanger. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 7The present invention provides a technical solution: a durability test device for an automobile sealing strip, comprising a cylindrical shell 1, extrusion wheels 21 are correspondingly arranged on both sides of the cylindrical shell 1, and the two extrusion wheels 21 on one side of the cylindrical shell 1 are symmetrically arranged up and down, and an electric telescopic rod 22 is installed on one side of the extrusion wheel 21, and one end of the electric telescopic rod 22 is connected to a fixing frame 23, and tightening disks 31 are correspondingly arranged on both sides of the cylindrical shell 1, and a tightening rope is wound around the tightening disk 31, and a clamping head 32 is installed at one end of the tightening rope. The extrusion wheels 21 are driven to rotate by an external torque. When the sealing performance of the automobile sealing strip is tested, the automobile sealing strip is first passed through both sides of the cylindrical shell 1 and clamped by the clamping head 32, and the automobile sealing strip is squeezed by the two extrusion wheels 21. When the extrusion wheels 21 are driven to rotate, the automobile sealing strip will translate left and right to squeeze different parts of itself, and the mold In the case where the cylinder wall and the surrounding sealing strip of the automobile engine cylinder block are frequently deformed due to thermal expansion and contraction when the automobile sealing strip is used, when the automobile sealing strip is translated to the position where the clamping head 32 is close to the extrusion wheel 21, the electric telescopic rod 22 is driven to contract, and the two clamping heads 32 are separated from the automobile sealing strip, so the clamping head 32 will pass through the extrusion wheel 21. When the automobile sealing strip moves in parallel, different positions of the automobile sealing strip will pass through the inside of the cylindrical shell 1. The inside of the cylindrical shell 1 is filled with organic oil to simulate the situation that the engine produces oil when it is running, so that the automobile sealing strip will be immersed in the oil for a long time when it is used, and then the durability test of the automobile sealing strip is carried out. The tightening disk 31 is used to provide a constant pulling force when the automobile sealing strip needs to be retracted to the position of the tightening disk 31, which is convenient for the retraction of the clamping head 32, and then the feeding direction of the automobile sealing strip is limited;

[0025] This design combines the extrusion deformation test with the oil immersion test. Compared with the single test in the existing technology, this test method can achieve more comprehensive results.

[0026] The inner wall of the cylindrical shell 1 is provided with a rotating shaft 12 for rotation at the upper and lower sides, and a contact ball 13 is fixedly installed on the outer side of the rotating shaft 12. An annular groove 131 is provided in the middle of the contact ball 13. A connecting shell 14 is fixedly installed on the upper and lower inner walls of the cylindrical shell 1. The bottom of the connecting shell 14 is open, and the bottom of the connecting shell 14 and the annular groove 131 are in sliding contact with each other. A thin flow channel 136 is provided inside the contact ball 13. The connecting shell 14 and the thin flow channel 136 are interconnected and matched. When the automobile sealing strip moves laterally, its upper and lower sides are respectively in contact with the annular grooves 131 of the upper and lower contact balls 13. The thin flow channel 136 is used to pump chemical liquids that react with each other onto the sealing strip. Only when cracks occur in the sealing strip will the two chemical liquids react with each other.

[0027] like Figure 4A one-way valve 138 is arranged inside the thin flow channel 136, one end of the thin flow channel 136 is connected with the liquid channel 132, and an expansion channel 137 is opened in the middle of the liquid channel 132. A mounting block 135 is fixedly installed on the inner wall of the liquid channel 132, and a spring 134 is connected to one side of the mounting block 135. A blocking block 133 is connected to one end of the spring 134. The outer wall of the blocking block 133 and the inner wall of the liquid channel 132 are in sliding contact with each other. When the liquid is pumped, the liquid will first enter the thin flow channel 136, then enter the liquid channel 132, and finally flow out from the other end. The one-way valve 138 is used to prevent the reverse flow of the liquid and enhance the sealing performance of the contact ball 13. When the liquid channel 132 is not vertically downward, that is, not in close contact with the automobile sealing strip, due to the elastic force of the spring 134 and the liquid pumping The pressures are balanced, and the blocking block 133 just blocks the liquid channel 132 to prevent the internal reactant from flowing out. Only when the liquid channel 132 is vertically downward, due to the weight of the blocking block 133 itself losing the reverse effect of the inner wall of the liquid channel 132, the gravity causes the blocking block 133 to move downward a certain distance, and the blocking block 133 and the expansion channel 137 are flush with each other. At this time, the liquid can flow out from the gap between the expansion channel 137 and the blocking block 133. Therefore, the liquid channel 132 is kept sealed when it is not in close contact with the automobile sealing strip. When the liquid channel 132 is in close contact with the automobile sealing strip, the liquid is conducted to prevent the internal reactant from contacting the engine oil inside the cylindrical shell 1, and to maintain the sealing inside the contact ball 13, so that the sealing detection and the engine oil immersion do not interfere with each other.

[0028] like Figure 2 One end of the connecting shell 14 located above the cylindrical shell 1 is connected to an upper pipe 15, and one end of the upper pipe 15 is connected to a reactant supply end 151. One end of the connecting shell 14 located below the cylindrical shell 1 is connected to a lower pipe 16, and one end of the lower pipe 16 is connected to a reactant supply end 161. Pumping pumps 17 are provided on the upper pipe 15 and the lower pipe 16. Reactant 1 and reactant 2 are acidic liquid and alkaline liquid that react to generate a large amount of carbon dioxide. Under normal circumstances, the acidic liquid and the alkaline liquid cannot contact and react due to the obstruction of the automobile sealing strip. When cracks occur in the automobile sealing strip, a conductive liquid flow channel is formed between the upper and lower parts thereof, and the acidic liquid and the alkaline liquid come into contact and release gas, which will quickly propel the cracks open until the automobile sealing strip breaks. At this time, it can be clearly known which squeeze caused the sealing failure. Compared with the existing sealing test method, the sealing failure can be quickly responded to, and the test and detection are closely combined to improve the detection efficiency and accuracy. The pumping pump 17 is used to pump the two reactants, and the pumped liquid will pass through the connecting shell 14 and enter the inside of the thin flow channel 136;

[0029] The first and second reactants are preferably acetic acid and sodium bicarbonate, which react to generate water and a large amount of carbon dioxide, which can quickly propel the cracks open.

[0030] like Figure 6 The inner walls of both sides of the cylindrical shell 1 are fixed with bearing frames 181 by welding. One side of the bearing frame 181 is evenly provided with a toggle blade 18 that rotates in a circular motion. One side of the toggle blade 18 contacts the outer walls of the upper and lower contact balls 13. When the automobile sealing strip moves, the contact ball 13 is driven to rotate. The rotation of the contact ball 13 causes the toggle blade 18 that contacts one side thereof to be subjected to a lateral force, thereby driving the toggle blade 18 to rotate around the rotating part on the bearing frame 181. The toggle blade 18 is used to drive the oil on both sides of the sealing strip to feed and flow. Since the automobile sealing strip and the contact ball 13 generate heat after a long period of friction, the flow of the oil will take away part of the heat, so that the temperature of the automobile sealing strip can be cooled to prevent it from being deformed due to high temperature and thus affecting the actual detection life.

[0031] like Figure 7 One side of the cylindrical shell 1 is connected to a Roots pump 42 through a pipeline, one end of the Roots pump 42 is connected to a heat exchanger 43, and the heat exchanger 43 is connected to the other side of the cylindrical shell 1 through a pipeline. The lubricating oil driven by the moving blades 18 will flow to one side of the cylindrical shell 1, and will be pumped to the Roots pump 42 through the pipeline, and will be cooled by the heat exchanger 43 to realize the cooling cycle of the engine oil and ensure the temperature stability of the engine oil;

[0032] Through holes are provided on both sides of the cylindrical shell 1, and guide blocks 41 are installed at the through holes. A sealing ring 411 is provided on the inner wall of the guide block 41. When the automobile sealing strip moves to the outside of the cylindrical shell 1, it is guided by the guide block 41, and the lubricating oil on the upper side is removed by the sealing ring 411 to prevent the lubricating oil from being brought out of the cylindrical shell 1 by the automobile sealing strip.

[0033] like Figure 6 The expansion channel 137 in the contact ball 13 located above the cylindrical shell 1 is located on the outside of the blocking block 133, and the expansion channel 137 in the contact ball 13 located below the cylindrical shell 1 is located on the inside of the blocking block 133. Since the upper reactant is pumped downward and the lower reactant is pumped upward, the lower blocking block 133 will always move from the liquid channel 132 to the expansion channel 137 when falling downward, so that the flow direction of the liquid can be maintained.

[0034] The present invention is provided with structures such as contact balls and extrusion wheels, and the automobile sealing strip is extruded at both ends to simulate actual use, and then sent into a cylindrical shell for a sealing test. When cracks are generated on the automobile sealing strip, two chemical reactants can contact and generate a large amount of gas, and the sealing strip is broken to intuitively and quickly reflect the sealing failure of the sealing strip. Since it is infiltrated by the lubricating oil in the cylindrical shell, the equipment combines the sealing test link with the compression deformation and the engine oil environment, effectively simulating the actual use occasion. Since the sealing test is performed synchronously after each extrusion, it can be accurately known how many times of extrusion will cause the sealing damage.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A durability test equipment for automobile sealing strips, characterized in that: The invention comprises a cylindrical shell (1), wherein extrusion wheels (21) are correspondingly arranged on both sides of the cylindrical shell (1), and the two extrusion wheels (21) located on one side of the cylindrical shell (1) are symmetrically arranged up and down, an electric telescopic rod (22) is installed on one side of the extrusion wheel (21), and one end of the electric telescopic rod (22) is connected to a fixing frame (23), and tightening disks (31) are correspondingly arranged on both sides of the cylindrical shell (1), a tightening rope is wound around the tightening disk (31), and a clamping head (32) is installed on one end of the tightening rope, and the extrusion wheel (21) is driven to rotate by an external torque.

2. The durability test equipment for automobile sealing strip according to claim 1, characterized in that: A rotating shaft (12) is rotatably mounted on the upper and lower inner walls of the cylindrical shell (1), a contact ball (13) is fixedly mounted on the outside of the rotating shaft (12), an annular groove (131) is provided in the middle of the contact ball (13), a connecting shell (14) is fixedly mounted on the upper and lower inner walls of the cylindrical shell (1), the bottom of the connecting shell (14) is open, and the bottom of the connecting shell (14) and the annular groove (131) are in sliding contact with each other, a thin flow channel (136) is provided inside the contact ball (13), and the connecting shell (14) and the thin flow channel (136) are interpenetrating and matched with each other.

3. The durability test equipment for automobile sealing strips according to claim 2, characterized in that: A one-way valve (138) is arranged inside the thin flow channel (136); one end of the thin flow channel (136) is connected to the liquid channel (132); an expansion channel (137) is provided in the middle of the liquid channel (132); a mounting block (135) is fixedly mounted on the inner wall of the liquid channel (132); a spring (134) is connected to one side of the mounting block (135); one end of the spring (134) is connected to a blocking block (133); the outer wall of the blocking block (133) and the inner wall of the liquid channel (132) are in sliding contact with each other.

4. The durability test equipment for automobile sealing strips according to claim 3, characterized in that: One end of the connecting shell (14) located above the cylindrical shell (1) is connected to an upper pipe (15), and one end of the upper pipe (15) is connected to a reactant supply end (151). One end of the connecting shell (14) located below the cylindrical shell (1) is connected to a lower pipe (16), and one end of the lower pipe (16) is connected to a reactant supply end (161). Pumping pumps (17) are provided on both the upper pipe (15) and the lower pipe (16).

5. The durability test equipment for automobile sealing strips according to claim 4, characterized in that: The inner walls of both sides of the cylindrical shell (1) are fixed with bearing frames (181) by welding, and one side of the bearing frame (181) is provided with a shifting blade (18) that rotates evenly in a circle, and one side of the shifting blade (18) contacts the outer walls of the upper and lower contact balls (13).

6. The durability test equipment for automobile sealing strips according to claim 5, characterized in that: One side of the cylindrical shell (1) is connected to a Roots pump (42) via a pipeline, one end of the Roots pump (42) is connected to a heat exchanger (43), and the heat exchanger (43) is connected to the other side of the cylindrical shell (1) via a pipeline.

7. The durability test equipment for automobile sealing strips according to claim 6, characterized in that: Through holes are provided on both sides of the cylindrical shell (1), and guide blocks (41) are installed at the through holes. A sealing ring (411) is provided on the inner wall of the guide block (41).

8. The durability test equipment for automobile sealing strips according to claim 7, characterized in that: The expansion channel (137) in the contact ball (13) located above the cylindrical shell (1) is located outside the blocking block (133), and the expansion channel (137) in the contact ball (13) located below the cylindrical shell (1) is located inside the blocking block (133).

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