Polytetrafluoroethylene gasket mechanical strength detection device and use method thereof

Abstract

The invention relates to the technical field of teflon gasket mechanical strength detection, in particular to a teflon gasket mechanical strength detection device and a using method thereof.The teflon gasket mechanical strength detection device comprises a case, a pressure testing rod and a top fixing plate, the top end of the case is fixedly connected with the top fixing plate through a stand column, and the pressure testing rod is fixedly connected to the middle of the top fixing plate; the side surface of the movable end of the pressure testing rod is fixedly connected with a side rod, the lower end of the side rod is fixedly welded with a side plate, and the middle of the upper end of the case is fixedly connected with a bottom supporting mechanism; the bottom supporting mechanism comprises a fixing seat, and in the process of detecting the polytetrafluoroethylene gasket, the stability of connection between the polytetrafluoroethylene gasket and the workbench can be further improved through vacuum adsorption, so that the problem of slippage between the polytetrafluoroethylene gasket and the workbench in the detection process is avoided, and the detection accuracy is improved. And the safety degree of detection is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical strength detection of polytetrafluoroethylene gaskets, in particular to a polytetrafluoroethylene gasket mechanical strength detection device and a use method thereof. Background Art

[0002] The PTFE gasket mechanical strength test device is a test device specially designed to evaluate the mechanical strength and sealing performance of PTFE gaskets under different pressure and temperature conditions; The device simulates actual working conditions, applies specific pressure to the gasket, measures its deformation and recovery ability under pressure, and thus evaluates the compression rate and rebound rate of the gasket. This test is crucial to ensure the reliability of gaskets in the chemical, petroleum, and natural gas industries, because these industries often involve high temperature, high pressure, and corrosive media. Insufficient mechanical strength of the gasket may lead to leakage, increase safety risks and environmental pollution. Through this test, material defects and weaknesses can be discovered in time, product design can be optimized, and the durability and sealing effect of the gasket can be improved, thereby ensuring the safe operation of industrial systems and extending the life of equipment. In addition, regular mechanical strength testing is also an important part of quality control; In the mechanical strength test of polytetrafluoroethylene gasket, the polytetrafluoroethylene gasket needs to be bent. Since the surface of the polytetrafluoroethylene gasket and the test table are relatively smooth, if there is a slip problem between the polytetrafluoroethylene gasket and the test table, it is easy to injure the test personnel. Therefore, a polytetrafluoroethylene gasket mechanical strength testing device and a method of using the same are proposed to solve the above problem. Summary of the invention

[0003] The object of the present invention is to provide a polytetrafluoroethylene gasket mechanical strength testing device and a method for using the same, so as to solve the problem that the polytetrafluoroethylene gasket needs to be bent during the mechanical strength testing of the polytetrafluoroethylene gasket. Since the surfaces of the polytetrafluoroethylene gasket and the testing table are relatively smooth, if slippage occurs between the polytetrafluoroethylene gasket and the testing table, the testing personnel may be easily injured.

[0004] To achieve the above object, the present invention provides the following technical solutions: A device for detecting the mechanical strength of a polytetrafluoroethylene gasket and a method for using the device, comprising a chassis, a pressure testing rod and a top fixing plate, the top of the chassis being fixedly connected to the top fixing plate via a column, the middle of the top fixing plate being fixedly connected to the pressure testing rod, a pressure block being fixedly connected to the movable end of the pressure testing rod, a side rod being fixedly connected to the side of the movable end of the pressure testing rod, a side plate being welded and fixed to the lower end of the side rod, and a bottom supporting mechanism being fixedly connected to the middle of the upper end of the chassis; the bottom supporting mechanism comprising a fixed seat, an adjusting block being installed on the inner side of the upper end of the fixed seat via a guide rod and an adjusting mechanism, a vacuum mechanism being fixedly connected to one side of the middle upper end of the adjusting block, a mounting hole being opened on the other side of the middle upper end of the adjusting block, an arc-shaped stopper being fixedly connected to one side of the mounting hole, and an adsorption mechanism being installed inside the mounting hole; and gaskets being installed between the arc-shaped stoppers.

[0005] As a further optimized content of the present invention, wherein: the adjustment block includes a fixed plate, a slider is fixedly connected to the bottom end of the fixed plate, a guide hole is opened on the inner side of one end of the slider, and a threaded hole is opened on the inner side of the other end of the slider.

[0006] As a further optimization of the present invention, there are two adjusting blocks, the lower ends of the two adjusting blocks are slidably connected to the fixing seat through a slider, and the slider is completely hidden inside the upper end of the fixing seat.

[0007] As a further optimized content of the present invention, wherein: the adjustment mechanism comprises a double-output shaft motor, and the main shafts at both ends of the double-output shaft motor are fixedly connected with threaded rods.

[0008] As a further optimization of the present invention, the lower end of the dual-shaft motor housing is fixedly connected to the fixed seat, the threaded rod and the slider are spirally connected through a threaded hole, a guide rod is provided on one side of the threaded rod and is slidably connected to the slider through a guide hole, and the end of the threaded rod away from the dual-shaft motor is rotationally connected to the fixed seat.

[0009] As a further optimization of the present invention, the exhaust mechanism includes an exhaust shell, a moving rod is slidably connected to the inner side of the upper end of the exhaust shell, an exhaust plate is welded and fixed to the bottom end of the moving rod, a return spring is fixedly connected to the upper end of the exhaust plate, and an exhaust hole is opened on one side of the upper end of the exhaust shell.

[0010] As a further optimization of the present invention, the outer wall of the exhaust shell is fixedly connected to the inside of the fixed plate, the return spring is arranged on the outside of the moving rod, and the upper end of the return spring is fixedly connected to the upper end of the inner cavity of the exhaust shell, the exhaust hole is arranged at the upper end of the exhaust plate, and the center point of the moving rod and the side plate is arranged on the same vertical plane.

[0011] As a further optimization content of the present invention, the adsorption mechanism includes a fixed block, a telescopic block is fixedly connected to the bottom end of the fixed block, a hemispherical rotating bead is rotatably connected to the inner side of the upper end of the fixed block, an adsorption plate is fixedly connected to the upper end of the hemispherical rotating bead, a rubber film is fixedly connected to the inner side of the upper end of the adsorption plate, and an exhaust pipe is fixedly connected to the lower end of the hemispherical rotating bead.

[0012] As a further optimization of the present invention, the exposed outer part of the exhaust pipe is arranged in a through groove opened on the side of the fixed block, the exhaust pipe is connected to the exhaust shell through an exhaust hole, the other end of the exhaust pipe is connected to the bottom of the adsorption plate through a hole groove opened inside the hemispherical rotating bead, and the bottom end of the telescopic block is fixedly connected to the bottom end of the mounting hole.

[0013] As a further optimized content of the present invention, the following steps are included: Step I: According to the size of the detection gasket, the spacing between the adjustment blocks is adjusted: the double-output shaft motor is controlled to drive the threaded rod to rotate, and the threaded rod drives the slider to move inside the upper end of the fixed seat during the rotation process, and then the movement of the slider is used to adjust the spacing between the adjustment blocks; Step II: Place the gasket: Place the gasket between the two arc-shaped blocks for positioning. During the positioning process, ensure that the bottom end of the gasket is in close contact with the upper end of the adsorption mechanism; Step III: Conducting the test: Control the moving end of the pressure test rod to move downward. During the downward movement of the moving end of the pressure test rod, the pressure block and the side plate move downward at the same time. The pressure block applies pressure to the upper end of the gasket for testing. During this process, the side plate squeezes the moving rod. During the downward movement of the moving rod, the vacuum plate is pushed downward. During the downward movement of the vacuum plate, the bottom of the adsorption plate is vacuumed through the vacuum pipe. During the vacuuming of the bottom of the adsorption plate, the rubber film is deformed, and then the top of the adsorption plate is vacuumed. During the vacuuming of the top of the adsorption plate, the top of the adsorption plate is tightly attached to the bottom of the gasket. During the extrusion and deformation of the gasket, the adsorption plate can move along the edge of the gasket and position it. Step IV: Remove the test piece and proceed to the next set of tests: After the test is completed, the pressure test rod is reset. During this process, the reset spring pulls the vacuum plate to reset, and then replenishes gas to the bottom of the adsorption plate. During the replenishment process, the rubber film is reset to separate the adsorption plate from the gasket, and then the tested gasket is removed, and then the next gasket to be tested is placed for testing.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by providing an adsorption mechanism, during the detection of the polytetrafluoroethylene gasket, the stability of the connection between the polytetrafluoroethylene gasket and the workbench can be further improved by vacuum adsorption, thereby avoiding the problem of slipping between the polytetrafluoroethylene gasket and the workbench during the detection process, and effectively improving the safety of the detection; 2. In the present invention, the vacuum mechanism is provided, and the pressure test rod is driven downward to vacuum the inside of the adsorption plate. In the process of contact between the pressing block and the polytetrafluoroethylene gasket, the positioning of the polytetrafluoroethylene gasket is achieved, the degree of automation is high, and no external power source is required, which is more stable; 3. In the present invention, by setting up the rubber film, the normal operation of the adsorption disk can be guaranteed during the process of vacuuming the inside of the adsorption disk, and at the same time, the dust around the detection device can be prevented from entering the inside of the vacuum mechanism, thereby providing good protection for the inside of the vacuum mechanism and facilitating the cleaning of the adsorption disk at a later time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the adjustment block of the present invention; Figure 3 It is a schematic diagram of the structure of the bottom support mechanism of the present invention; Figure 4 It is a schematic diagram of the structure of the air extraction mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the adsorption mechanism of the present invention.

[0016] In the figure: 1, chassis; 2, pressure test rod; 3, pressure block; 4, side rod; 5, side plate; 6, top fixing plate; 7. Bottom support mechanism; 71. Fixed seat; 72, adjusting block; 721, fixing plate; 722, sliding block; 723, guide hole; 724, threaded hole; 73. Guide rod; 74. Adjustment mechanism; 741. Double-output shaft motor; 742. Threaded rod; 75, air extraction mechanism; 751, air extraction shell; 752, air extraction plate; 753, return spring; 754, moving rod; 755, air extraction hole; 76. arc-shaped stopper; 77. mounting hole; 78. adsorption mechanism; 781. fixed block; 782. hemispherical rotating bead; 783. adsorption plate; 784. rubber film; 785. exhaust pipe; 786. telescopic block; 8. Gasket. DETAILED DESCRIPTION

[0017] See also Figure 1-5 , the present invention provides a technical solution: A polytetrafluoroethylene gasket mechanical strength detection device and a use method thereof, comprising a chassis 1, a pressure test rod 2 and a top fixing plate 6, wherein the top of the chassis 1 is fixedly connected to the top fixing plate 6 through a column, the pressure test rod 2 is fixedly connected to the middle of the top fixing plate 6, the moving end of the pressure test rod 2 is fixedly connected to a pressure block 3, the side of the moving end of the pressure test rod 2 is fixedly connected to a side rod 4, the lower end of the side rod 4 is welded and fixed to a side plate 5, and the middle of the upper end of the chassis 1 is fixedly connected to a bottom support mechanism 7; the bottom support mechanism 7 comprises a fixed seat 71, an adjustment block 72 is installed on the inner side of the upper end of the fixed seat 71 through a guide rod 73 and an adjustment mechanism 74, one side of the middle upper end of the adjustment block 72 is fixedly connected to an exhaust mechanism 75, the other side of the middle upper end of the adjustment block 72 is provided with a mounting hole 77, one side of the mounting hole 77 is fixedly connected to an arc-shaped stopper 76, and an adsorption mechanism 78 is installed inside the mounting hole 77; a gasket 8 is installed between the arc-shaped stoppers 76.

[0018] As a technical solution for further implementation of the present scheme, the adjusting block 72 includes a fixing plate 721, a slider 722 is fixedly connected to the bottom end of the fixing plate 721, a guide hole 723 is provided on the inner side of one end of the slider 722, and a threaded hole 724 is provided on the inner side of the other end of the slider 722. There are two adjusting blocks 72, and the lower ends of the two adjusting blocks 72 are slidably connected to the fixing seat 71 through the slider 722. The slider 722 is completely hidden inside the upper end of the fixing seat 71. The adjusting mechanism 74 includes a double-output shaft motor 741, and the main shafts at both ends of the double-output shaft motor 741 are fixedly connected to the threaded rod 742. Through the above arrangement, in the actual application process, the distance between the two adjusting blocks 72 can be adjusted by the double-output shaft motor 741, so that different gaskets 8 can be tested; As a technical solution for further implementation of this solution, the lower end of the housing of the double-output shaft motor 741 is fixedly connected to the fixed seat 71, the threaded rod 742 and the slider 722 are spirally connected through the threaded hole 724, a guide rod 73 is arranged on one side of the threaded rod 742 and is slidably connected to the slider 722 through the guide hole 723, and the end of the threaded rod 742 away from the double-output shaft motor 741 is rotatably connected to the fixed seat 71. Through the above arrangement, the slider 722 can be driven to move by the rotation of the threaded rod 742, so that the position of the adjustment block 72 can be adjusted, and the synchronous adjustment of the two adjustment blocks 72 can be achieved through the double-output shaft motor 741; As a technical solution for further implementation of this scheme, the exhaust mechanism 75 includes an exhaust shell 751, a moving rod 754 is slidably connected to the inner side of the upper end of the exhaust shell 751, an exhaust plate 752 is welded and fixed to the bottom end of the moving rod 754, a return spring 753 is fixedly connected to the upper end of the exhaust plate 752, and an exhaust hole 755 is opened on one side of the upper end of the exhaust shell 751. Through the above arrangement, the exhaust mechanism 75 can be used to evacuate the inside of the adsorption disk 783; As a technical solution for further implementation of this solution, the outer wall of the air extraction shell 751 is fixedly connected to the inside of the fixed plate 721, the return spring 753 is arranged on the outside of the moving rod 754, and the upper end of the return spring 753 is fixedly connected to the upper end of the inner cavity of the air extraction shell 751, the air extraction hole 755 is arranged at the upper end of the air extraction plate 752, and the center point of the moving rod 754 and the side plate 5 are arranged on the same vertical plane. The above arrangement can further improve the stability of the air extraction shell 751 after installation, and at the same time, the side plate 5 can be used to stably squeeze the moving rod 754; As a technical solution for further implementation of this solution, the adsorption mechanism 78 includes a fixed block 781, a telescopic block 786 is fixedly connected to the bottom end of the fixed block 781, a hemispherical rotating bead 782 is rotatably connected to the inner side of the upper end of the fixed block 781, an adsorption disk 783 is fixedly connected to the upper end of the hemispherical rotating bead 782, a rubber film 784 is fixedly connected to the inner side of the upper end of the adsorption disk 783, and an exhaust pipe 785 is fixedly connected to the lower end of the hemispherical rotating bead 782. Through the above arrangement, the gasket 8 can be stably positioned during the detection process of the gasket 8; As a technical solution for further implementation of the present scheme, the exhaust pipe 785 is exposed on the outside and is arranged in a through groove opened on the side of the fixed block 781. The exhaust pipe 785 is connected to the exhaust shell 751 through the exhaust hole 755. The other end of the exhaust pipe 785 is connected to the bottom end of the adsorption plate 783 through the hole groove opened inside the hemispherical rotating bead 782. The bottom end of the telescopic block 786 is fixedly connected to the bottom end of the mounting hole 77. Through the above arrangement, the stability of the gasket 8 during the detection process can be further improved.

[0019] As a technical solution for further implementing the present scheme, the following steps are included: Step I: According to the size of the detection gasket, the spacing between the adjustment blocks 72 is adjusted: the double-output shaft motor 741 is controlled to drive the threaded rod 742 to rotate, and the threaded rod 742 drives the slider 722 to move inside the upper end of the fixed seat 721 during the rotation process, and then the movement of the slider 722 is used to adjust the spacing between the adjustment blocks 72; Step II: Placing the gasket 8: placing the gasket 8 between the two arc-shaped stoppers 76 for positioning. During the positioning process, ensure that the bottom end of the gasket 8 is in close contact with the upper end of the adsorption mechanism 78; Step III: Conducting a test: Control the moving end of the pressure test rod 2 to move downward. During the downward movement of the moving end of the pressure test rod 2, the pressure block 3 and the side plate 5 move downward at the same time. The pressure block 3 applies pressure to the upper end of the gasket 8 for testing. During this process, the side plate 5 squeezes the moving rod 754. During the downward movement of the moving rod 754, the vacuum plate 752 is pushed to move downward. During the downward movement of the vacuum plate 752, the bottom of the adsorption disk 783 is vacuumed through the vacuum pipe 785. During the vacuum treatment of the bottom of the adsorption disk 783, the rubber film 784 is deformed, and then the top of the adsorption disk 783 is vacuumed. During the vacuum treatment of the top of the adsorption disk 783, the top of the adsorption disk 783 is tightly attached to the bottom of the gasket 8. During the extrusion and deformation of the gasket 8, the adsorption disk 783 can move along the edge of the gasket 8 and position it. Step IV: Remove the test piece and proceed to the next set of tests: After the test is completed, the pressure test rod 2 is reset. During this process, the reset spring 753 pulls the vacuum plate 752 to reset, and then replenishes gas to the bottom of the adsorption disk 783. During the replenishment process, the rubber film 784 is reset to separate the adsorption disk 783 from the gasket 8, and then the tested gasket 8 is removed, and then the next gasket 8 to be tested is placed for testing.

[0020] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A polytetrafluoroethylene gasket mechanical strength testing device, comprising a chassis (1), a pressure testing rod (2) and a top fixing plate (6), characterized in that: The top of the chassis (1) is fixedly connected to a top fixing plate (6) via a column, the middle of the top fixing plate (6) is fixedly connected to a pressure test rod (2), the movable end of the pressure test rod (2) is fixedly connected to a pressure block (3), the side of the movable end of the pressure test rod (2) is fixedly connected to a side rod (4), the lower end of the side rod (4) is welded and fixed to a side plate (5), and the middle of the upper end of the chassis (1) is fixedly connected to a bottom support mechanism (7); The bottom support mechanism (7) comprises a fixed seat (71), an adjusting block (72) is installed on the inner side of the upper end of the fixed seat (71) via a guide rod (73) and an adjusting mechanism (74), a suction mechanism (75) is fixedly connected to one side of the middle upper end of the adjusting block (72), a mounting hole (77) is opened on the other side of the middle upper end of the adjusting block (72), an arc-shaped stopper (76) is fixedly connected to one side of the mounting hole (77), and an adsorption mechanism (78) is installed inside the mounting hole (77); Gaskets (8) are installed between the arc-shaped stoppers (76).

2. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 1, characterized in that: The adjustment block (72) comprises a fixing plate (721), the bottom end of the fixing plate (721) being fixedly connected to a slider (722), a guide hole (723) being provided on the inner side of one end of the slider (722), and a threaded hole (724) being provided on the inner side of the other end of the slider (722).

3. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 2, characterized in that: Two adjusting blocks (72) are provided, and the lower ends of the two adjusting blocks (72) are slidably connected to the fixing seat (71) via a sliding block (722), and the sliding block (722) is completely hidden inside the upper end of the fixing seat (71).

4. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 1, characterized in that: The adjustment mechanism (74) comprises a double-shaft motor (741), and main shafts at both ends of the double-shaft motor (741) are fixedly connected to threaded rods (742).

5. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 4, characterized in that: The lower end of the housing of the dual-output shaft motor (741) is fixedly connected to the fixing seat (71); the threaded rod (742) is spirally connected to the slider (722) via a threaded hole (724); a guide rod (73) is provided on one side of the threaded rod (742) and is slidably connected to the slider (722) via the guide hole (723); and one end of the threaded rod (742) away from the dual-output shaft motor (741) is rotationally connected to the fixing seat (71).

6. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 1, characterized in that: The exhaust mechanism (75) comprises an exhaust shell (751), a moving rod (754) is slidably connected to the inner side of the upper end of the exhaust shell (751), an exhaust plate (752) is welded and fixed to the bottom end of the moving rod (754), a return spring (753) is fixedly connected to the upper end of the exhaust plate (752), and an exhaust hole (755) is opened on one side of the upper end of the exhaust shell (751).

7. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 6, characterized in that: The outer wall of the air extraction shell (751) is fixedly connected to the inside of the fixed plate (721), the return spring (753) is arranged on the outside of the moving rod (754), and the upper end of the return spring (753) is fixedly connected to the upper end of the inner cavity of the air extraction shell (751), the air extraction hole (755) is arranged at the upper end of the air extraction plate (752), and the center point of the moving rod (754) and the side plate (5) are arranged on the same vertical plane.

8. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 1, characterized in that: The adsorption mechanism (78) comprises a fixed block (781), the bottom end of the fixed block (781) is fixedly connected to a telescopic block (786), the inner side of the upper end of the fixed block (781) is rotatably connected to a hemispherical rotating bead (782), the upper end of the hemispherical rotating bead (782) is fixedly connected to an adsorption disk (783), the inner side of the upper end of the adsorption disk (783) is fixedly connected to a rubber film (784), and the lower end of the hemispherical rotating bead (782) is fixedly connected to an exhaust pipe (785).

9. A polytetrafluoroethylene gasket mechanical strength testing device according to claim 8, characterized in that: The exposed outer portion of the exhaust pipe (785) is arranged in a through groove opened on the side of the fixed block (781); the exhaust pipe (785) is connected to the exhaust shell (751) via the exhaust hole (755); the other end of the exhaust pipe (785) is connected to the bottom end of the adsorption plate (783) via a hole groove opened inside the hemispherical rotating bead (782); and the bottom end of the telescopic block (786) is fixedly connected to the bottom end of the mounting hole (77).

10. A method for using a polytetrafluoroethylene gasket mechanical strength testing device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step I: adjusting the spacing between the adjustment blocks (72) according to the size of the detection gasket: controlling the double-shaft motor (741) to drive the threaded rod (742) to rotate, and during the rotation of the threaded rod (742), driving the slider (722) to move inside the upper end of the fixed seat (721), and then utilizing the movement of the slider (722) to adjust the spacing between the adjustment blocks (72); Step II: Placing the gasket (8): placing the gasket (8) between the two arc-shaped stoppers (76) for positioning. During the positioning process, ensure that the bottom end of the gasket (8) is in close contact with the upper end of the adsorption mechanism (78); Step III: Conducting a test: Controlling the moving end of the pressure test rod (2) to move downward. During the downward movement of the moving end of the pressure test rod (2), the pressure block (3) and the side plate (5) move downward at the same time. The pressure block (3) applies pressure to the upper end of the gasket (8) for testing. During this process, the side plate (5) squeezes the moving rod (754). During the downward movement of the moving rod (754), the air extraction plate (752) is pushed to move downward. During the downward movement of the air extraction plate (752), the bottom of the adsorption plate (783) is vacuumed through the air extraction pipe (785). During the vacuuming of the bottom of the adsorption plate (783), the rubber film (784) is deformed, and then the top of the adsorption plate (783) is vacuumed. During the vacuuming of the top of the adsorption plate (783), the top of the adsorption plate (783) is tightly attached to the bottom of the gasket (8). During the extrusion and deformation of the gasket (8), the adsorption plate (783) can move along the edge of the gasket (8) and position it. Step IV: Remove the test piece and conduct the next set of tests: After the test is completed, the pressure test rod (2) is reset. During this process, the reset spring (753) pulls the air extraction plate (752) to reset, thereby replenishing gas to the bottom of the adsorption plate (783). During the replenishment process, the rubber film (784) is reset to separate the adsorption plate (783) from the gasket (8). The gasket (8) after the test is then removed, and the next gasket (8) to be tested is placed thereon for testing.

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