Vacuum testing device and manufacturing method

Abstract

Embodiments of the present application provide a kind of vacuum test device and manufacturing method, it is related to vacuum experiment technical field.The vacuum test device includes vacuum box, motion shaft and loading piece.Vacuum box is used to accommodate test sample;Motion shaft is movably arranged in vacuum box, and one end of motion shaft is arranged in the interior of vacuum box, and is connected with loading piece, the other end is arranged in the exterior of vacuum box, and the outer wall of motion shaft is provided with sealing sleeve, and loading piece is used to act on test sample.Therefore, the vacuum test device is simple in structure, and the manufacturing cost is lower, and by setting sealing sleeve on motion shaft, the sealing performance of vacuum box is improved when motion shaft drives loading piece to move relative to vacuum box, so that the vacuum environment of vacuum box is stable, and the accuracy of test sample test is improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum experimental technology, and more specifically, to a vacuum testing apparatus and its manufacturing method. Background Technology

[0002] To measure the performance of structural components operating in a vacuum environment, it is usually necessary to place the components in a vacuum testing facility for testing. Existing vacuum testing facilities are typically expensive, complex in structure, and poorly economical and practical; some even have poor sealing performance. Summary of the Invention

[0003] This invention provides a vacuum testing device and its manufacturing method, which has a simple structure, low cost, good adaptability and sealing performance.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a vacuum testing apparatus, comprising a vacuum chamber, a motion shaft, and a loading component;

[0006] The vacuum chamber is used to hold the sample;

[0007] The motion shaft is movably disposed in the vacuum chamber, with one end of the motion shaft disposed inside the vacuum chamber and connected to the loading member, and the other end disposed outside the vacuum chamber. A sealing sleeve is provided on the outer wall of the motion shaft, and the loading member is used to act on the sample.

[0008] In an optional embodiment, the vacuum testing device further includes a fixing member, which is fixedly disposed on the vacuum chamber, and the motion shaft is movably disposed on the fixing member.

[0009] In an optional embodiment, a receiving cavity is provided between the inner wall and the outer wall of the fixing member, and the vacuum testing device further includes an expansion ring, which is disposed in the receiving cavity and abuts against the inner wall and the outer wall of the fixing member.

[0010] In an optional embodiment, the outer wall of the expansion ring is provided with a plurality of first mounting grooves, and each of the plurality of first mounting grooves is provided with a first elastic member, one end of the first elastic member extending out of the first mounting groove abutting against the outer wall of the fixing member.

[0011] In an optional embodiment, the inner wall of the expansion ring is further provided with a second annular mounting groove, and the second mounting groove is provided with a second annular elastic member, which is in a contracted state.

[0012] In an optional embodiment, a fixing seat is provided at one end of the fixing member that extends into the interior of the vacuum chamber, and the fixing seat is connected to the inner wall of the vacuum chamber;

[0013] The vacuum testing device also includes a sealing element, which is sleeved on the outside of the fixing element and located at the end of the fixing element that extends out of the vacuum chamber. The sealing element is fixedly connected to the outer wall of the vacuum chamber.

[0014] In an optional embodiment, the vacuum testing device further includes a pad, a pad block, and fasteners. The pad is attached to the fixed base, the fixed base has a groove, and the pad has an opening corresponding to the groove. The groove is used to accommodate the pad block, and the fasteners are sequentially inserted through the pad, the pad block, the fixed base, and the vacuum chamber.

[0015] In an optional embodiment, the vacuum testing device further includes a first clamping ring and a second clamping ring. The outer wall of the motion shaft is provided with a first slot and a second slot. The first slot and the second slot are located outside and inside the vacuum chamber, respectively. The first clamping ring is disposed in the first slot, and the second clamping ring is disposed in the second slot.

[0016] In an optional embodiment, the vacuum testing device further includes a limiting member, a threaded hole is provided on the end face of one end of the motion shaft, and a connecting part is provided on the loading member, the connecting part being threadedly engaged with the threaded hole.

[0017] The motion shaft is also provided with a through hole, which communicates with the threaded hole. The limiting member passes through the through hole and abuts against the connecting part.

[0018] Secondly, the present invention provides a manufacturing method for manufacturing the vacuum testing apparatus described in any of the foregoing embodiments. The manufacturing method includes:

[0019] Concrete was poured to create a vacuum chamber, and the sample was placed inside the vacuum chamber;

[0020] The inner and outer walls of the vacuum chamber are coated with a sealing material;

[0021] A sealing assembly is provided in the vacuum chamber, and a sealing sleeve is fitted onto the outer wall of the motion shaft and is movably disposed within the sealing assembly.

[0022] The beneficial effects of the vacuum testing device and manufacturing method provided in the embodiments of the present invention include: the vacuum testing device has a simple structure and low manufacturing cost, and by fitting a sealing sleeve onto the moving shaft, the sealing performance of the vacuum chamber is improved when the moving shaft drives the loading component to move relative to the vacuum chamber, thereby stabilizing the vacuum environment of the vacuum chamber and improving the accuracy of the sample test. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A perspective view of the vacuum testing apparatus provided in an embodiment of the present invention;

[0025] Figure 2 A cross-sectional view of the vacuum testing apparatus provided in an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of a partial sealing assembly provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the expansion ring structure provided in an embodiment of the present invention.

[0028] Icons: 10-Vacuum testing device; 100-Vacuum chamber; 200-Motion shaft; 210-First slot; 220-Second slot; 230-Threaded hole; 240-Through hole; 300-Loading component; 310-Connecting part; 400-Conduit; 500-Sealing assembly; 510-Fixing component; 511-Accommodating cavity; 512-Inner wall; 513-Outer wall; 514-Fixing seat; 515-Groove; 520-Expansion ring; 521-First mounting groove; 522-First elastic element; 523-Second mounting groove; 524-Second elastic element; 525-Annular groove; 530-Sealing component; 600-Fixing assembly; 610-Fastener; 700-Ring assembly; 710-First ring; 720-Second ring; 800-Limiting component; 20-Sample. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0035] With the development of materials science and technology, more and more components and equipment are operating in high vacuum environments (vacuum degree 10). 5 Pa 10 7 Vacuum environments (on the order of Pa) present unique contact challenges. For instance, the lack of oxygen and other atmospheric reactants in a vacuum causes the oxide film on metal surfaces to be quickly consumed and removed during friction, making it difficult for new oxide films to form. Consequently, the friction surfaces quickly become "exposed," leading to a rapid increase in surface temperature and altering the material's physical properties and chemical stability. Structural loading under vacuum conditions also alters many physical properties, necessitating extensive experiments in vacuum environments for the development of novel materials. However, existing vacuum testing equipment is typically expensive, complex in structure, and lacks economic practicality; some even suffer from poor sealing performance.

[0036] To resolve the above issues, please refer to [link / reference]. Figure 1 This invention provides a vacuum testing device, which is applied in the field of vacuum testing equipment technology, and is especially suitable for aerospace, high-precision machining and other fields. It has a simple structure, low cost, good adaptability and sealing performance.

[0037] Please see Figures 1 to 4 The vacuum testing device 10 includes a vacuum chamber 100, a motion shaft 200, a sealing sleeve (not shown), a loading component 300, a conduit 400, a sealing assembly 500, a fixing assembly 600, a hoop assembly 700, and a limiting component 800.

[0038] The motion shaft 200 moves relative to the vacuum chamber 100 under the driving action of the drive device (not shown), thereby driving the loading member 300 to move and act on the sample 20, such as squeezing or clamping the sample 20, to reflect the actual performance indicators of the sample 20 in a vacuum environment. This allows for the study of the stress, deformation, and damage of the sample 20 under complex environments and loads. The fixing component 600 is used to fix the sealing component 500 on the vacuum chamber 100. The sealing sleeve is set on the outer wall 513 of the motion shaft 200, and the retaining ring component 700 is set outside the sealing sleeve to fix the sealing sleeve. The limiting member 800 is set on the motion shaft 200.

[0039] In this embodiment, the vacuum chamber 100 is made by pouring concrete. A sealing and curing agent is applied to the inner and outer walls 513 of the vacuum chamber 100 to improve the sealing properties of the concrete material. The sealing coating has the function of sealing the porous structure of the concrete surface at a microscopic level and has good permeability, forming a sealing layer of a certain thickness on the concrete surface. Using concrete as the structural support ensures its sealing effect.

[0040] By pouring concrete into the vacuum chamber 100, the specific dimensions of the vacuum chamber 100 can be modified according to actual conditions, thereby expanding the application range of the vacuum testing device 10. In addition, the concrete vacuum chamber 100 can achieve a vacuum sealing technology solution with large volume, long holding time and high safety factor, and can provide a sealed, constant temperature, low magnetic field and high strength experimental environment. Furthermore, the material of the concrete sealing chamber can be changed according to actual conditions to study the sealing performance and physical and mechanical properties of the specimens under different materials.

[0041] It should be noted that the vacuum equipment can be a combination of a mechanical pump and a Roots pump. Although this type of equipment cannot precisely maintain the vacuum level within the pipeline, it is economical and convenient, and can meet basic experimental requirements. Furthermore, a bellows shut-off valve can be installed in the air duct 400 to prevent air backflow by closing the valve when the environment within the vacuum chamber 100 meets the requirements.

[0042] Furthermore, the sealing assembly 500 described above includes a retainer 510, an expansion ring 520, and a seal 530.

[0043] The fixing member 510 is fixedly installed in the vacuum chamber 100, and the motion shaft 200 is movably installed in the fixing member 510.

[0044] In this embodiment, the fixing member 510 is cylindrical, and the motion shaft 200 passes through the fixing member 510. The sealing sleeve provided on the outer wall 513 of the motion shaft 200 is in close contact with the fixing member 510 so as to realize the movement of the motion shaft 200 relative to the fixing member 510, while achieving the sealing performance of the vacuum chamber 100, ensuring the maintenance of the vacuum environment inside the vacuum chamber 100, which is beneficial to the accuracy of the test of the sample 20.

[0045] Optionally, the sealing sleeve comprises an inner rubber layer, a rubber cloth layer, and an outer rubber layer. This type of rubber material is suitable for air compression under positive pressure conditions and contact with inert gases. The sealing sleeve can be made of polytetrafluoroethylene (PTFE) to provide excellent lubricity, extremely low coefficients of dynamic and static friction, and wear resistance. The coefficient of friction between PTFE and steel is approximately 0.04, only 1 / 12 to 1 / 20 that of rubber. Therefore, using PTFE as the sealing sleeve can significantly reduce frictional resistance and ensure no crawling at low speeds. Although PTFE has elasticity, it is much less elastic than rubber, ensuring that it maintains its original size and shape during use.

[0046] Furthermore, a receiving cavity 511 is provided between the inner wall 512 and the outer wall 513 of the fastener 510, and an expansion ring 520 is disposed in the receiving cavity 511 and abuts against the inner wall 512 and the outer wall 513 of the fastener 510.

[0047] It should be noted that the fastener 510 can be made of nitrile rubber, which has good resistance to oil, water, solvents, and high-pressure oil. Furthermore, it also has good compressibility, elongation, abrasion resistance, aging resistance, airtightness, and excellent adhesion. In other words, the fastener 510 has a certain degree of deformation capability.

[0048] In this embodiment, by filling the cavity 511 of the fixing member 510 with the expansion ring 520, the expansion ring 520 abuts against the inner wall 512 and the outer wall 513 of the fixing member 510, so that the inner wall 512 of the fixing member 510 is in close contact with the motion shaft 200, thereby improving the sealing performance between the fixing member 510 and the motion shaft 200, and making the outer wall 513 of the fixing member 510 in close contact with the vacuum box 100, thereby improving the connection stability and sealing performance between the fixing member 510 and the vacuum box 100.

[0049] Alternatively, the expansion ring 520 can be made of styrene-butadiene rubber, which is obtained by copolymerizing butadiene and styrene. This type of expansion ring 520 is a low-cost, non-oil-resistant material with good water resistance and elasticity, good wear resistance and aging resistance, and good overall performance and chemical stability. It can be used in combination with natural rubber when making components.

[0050] Furthermore, the outer wall 513 of the expansion ring 520 is provided with a plurality of first mounting grooves 521, and each of the plurality of first mounting grooves 521 is provided with a first elastic element 522, one end of the first elastic element 522 extending out of the first mounting groove 521 abutting against the outer wall 513 of the fixing element 510.

[0051] In this embodiment, a plurality of first mounting grooves 521 are evenly arranged around the outer wall 513 of the expansion ring 520, so that a plurality of first elastic members 522 abut against the outer wall 513 of the fixing member 510.

[0052] It is understandable that the multiple first elastic elements 522 are in a compressed state within the first mounting groove 521, which on the one hand allows the expansion ring 520 to be in close contact with the inner wall 512 of the fixing member 510, and on the other hand allows the first elastic elements 522 to act on the outer wall 513 of the fixing member 510, so that the outer wall 513 of the fixing member 510 is in close contact with the vacuum box 100.

[0053] Furthermore, the inner wall 512 of the expansion ring 520 is also provided with a second mounting groove 523 in an annular shape, and a second elastic member 524 in an annular shape is provided in the second mounting groove 523. The second elastic member 524 is in a contracted state.

[0054] In this embodiment, by providing a second elastic member 524 in a contracted state in the second mounting groove 523 of the expansion ring 520, a certain contraction force is generated, which further increases the force of the expansion ring 520 on the inner wall 512 of the fixing member 510, thereby increasing the contact force of the fixing member 510 on the motion shaft 200.

[0055] Specifically, the outer wall 513 of the expansion ring 520 near the bottom end is also provided with an annular groove 525, so that the expansion ring 520 can undergo a certain degree of deformation during installation, thereby preventing the expansion ring 520 from conflicting with the fastener 510 during assembly.

[0056] Optionally, the first elastic element 522 and the second elastic element 524 can be springs.

[0057] Furthermore, a fixing seat 514 is provided at one end of the fastener 510 that extends into the interior of the vacuum chamber 100, and the fixing seat 514 is connected to the inner wall 512 of the vacuum chamber 100.

[0058] The sealing element 530 is sleeved on the outside of the fixing element 510 and is located at the end of the fixing element 510 that extends out of the vacuum chamber 100. The sealing element 530 is fixedly connected to the outer wall 513 of the vacuum chamber 100.

[0059] In this embodiment, the sealing element 530 is detachably connected to the fixing element 510 and can be engaged with the fixing element 510. By sleeved the sealing element 530 on the end of the fixing element 510 that extends outside the vacuum chamber 100, and fixing the sealing element 530 to the vacuum chamber 100, the fixing element 510 can be fixed, preventing the fixing element 510 from moving relative to the vacuum chamber 100; at the same time, since the sealing element 530 and the fixing element 510 are in close contact, the sealing performance between the fixing element 510 and the vacuum chamber 100 can be improved.

[0060] Optionally, seal 530 can be made of natural rubber, whose basic chemical composition is cis-polyisoprene, a polymer of isoprene. This type of seal 530 exhibits excellent abrasion resistance, high elasticity, tensile strength and elongation, acid and alkali resistance, and good overall performance.

[0061] Furthermore, the aforementioned fixing component 600 includes a pad (not shown), a pad block (not shown), and a fastener 610. The pad is attached to the fixing seat 514, and the fixing seat 514 has a groove 515 for accommodating the pad block.

[0062] In this embodiment, since the fastener 510 has a certain deformation capacity, when the fastener 610 acts directly on the fastener 510, the fixing seat 514 of the fastener 510 will also undergo a certain deformation under the force of the fastener 610, which is not conducive to the installation of the fastener 610.

[0063] Therefore, a hard pad is provided on the bottom surface of the fixing seat 514, which is in contact with the surface of the fixing seat 514. The pad has an opening corresponding to the groove 515. By placing the pad in the groove 515, the fastener 610 passes through the opening of the pad, the pad, the fixing seat and the vacuum box 100 in sequence, so that the fastener 610 is firmly connected to the inner wall 512 of the vacuum box 100, thereby achieving the purpose of fixing the sealing component 500.

[0064] Of course, the seal 530 is also provided with fasteners 610. By passing the fasteners 610 through the seal 530 and connecting them to the outer wall 513 of the vacuum chamber 100, the purpose of fixing the seal 530 is achieved.

[0065] Optionally, the fastener 610 may be a bolt, and the number of bolts provided on the fixing seat 514 and the seal 530 is eight. By placing the medicine tube into a pre-drilled hole in the top wall of the vacuum chamber 100, and then screwing the bolt into the pre-drilled hole to break the medicine tube, a pre-tightening force is generated through the medicine inside the medicine tube, thereby fixing the bolt.

[0066] Furthermore, the aforementioned hoop assembly 700 includes a first hoop 710 and a second hoop 720. The outer wall 513 of the motion shaft 200 is provided with a first slot 210 and a second slot 220, which are located outside and inside the vacuum chamber 100, respectively.

[0067] In this embodiment, since the sealing sleeve is fitted onto the outer wall 513 of the motion shaft 200, the first clamping ring 710 is set in the first slot 210 and the second clamping ring 720 is set in the second slot 220, so that the first clamping ring 710 and the second clamping ring 720 are clamped onto the outside of the sealing sleeve, thereby increasing the stability and adhesion of the sealing sleeve on the motion shaft 200.

[0068] Furthermore, a threaded hole 230 is provided on the end face of one end of the motion shaft 200, and a connecting part 310 is provided on the loading member 300. The connecting part 310 is threadedly engaged with the threaded hole 230. The motion shaft 200 is also provided with a through hole 240, which communicates with the threaded hole 230. The limiting member 800 passes through the through hole 240 and abuts against the connecting part 310.

[0069] In this embodiment, the outer wall 513 of the connecting part 310 is provided with an external thread for extending into the threaded hole 230 to connect with the motion shaft 200. The limiting member 800 passes through the through hole 240 and abuts against the connecting part 310 provided in the threaded hole 230 to limit the connecting part 310.

[0070] It is understood that the loading element 300 can be of any shape, and no specific limitations are made on the shape and structure of the loading element 300 here.

[0071] Furthermore, the present invention also provides a manufacturing method for manufacturing the vacuum testing device 10 in the above embodiments, the manufacturing method comprising the following steps:

[0072] Step S100: Pour concrete to form a vacuum chamber 100 and place the sample 20 inside the vacuum chamber 100.

[0073] In this embodiment, a vacuum chamber 100 is constructed by pouring concrete, and a conduit 400 is connected to the vacuum chamber 100 to provide a vacuum environment for the vacuum chamber 100.

[0074] In step S200, a sealing material is applied to the inner wall 512 and outer wall 513 of the vacuum chamber 100.

[0075] In this embodiment, the sealing properties of the vacuum chamber 100, which is made of concrete, are improved by applying a sealing material to the inner wall 512 and outer wall 513 of the vacuum chamber 100. The sealing coating has the function of sealing the porous structure of the concrete surface at a microscopic level and has good permeability, thus forming a sealing layer of a certain thickness on the concrete surface of the vacuum chamber 100. The concrete serves as the structural support, ensuring its sealing effect.

[0076] Specifically, apply a primer and silane-terminated polyether sealant to the contact area between the concrete sealing box and the rubber sleeve of the concrete sealing box. Silane-terminated polyether sealant has excellent weather resistance, mechanical properties, and displacement capacity.

[0077] In addition, the vacuum chamber 100 uses a high-strength grouting material with added fly ash, steel fiber, and admixtures. The water-cement ratio used when pouring the vacuum chamber 100 is 0.125, the concrete strength grade is C70, the 28-day compressive strength reaches 73MPa, the elastic modulus of the material is 24.5GPa and the Poisson's ratio is 0.15 as measured by the MTS indoor triaxial tester, and the bulk density of the test block is 28kN / m³ as measured by weighing.

[0078] It should be noted that after the vacuum chamber 100 is manufactured, it is left to stand for a preset time. Then, a positive pressure of 5 kPa is applied to the vacuum chamber 100 using an air compressor, and soapy water is applied. If no visible leaks are found after the test, the airtightness material test can be carried out.

[0079] In step S300, a sealing assembly 500 is installed in the vacuum chamber 100, and a sealing sleeve is fitted onto the outer wall 513 of the motion shaft 200 and movably mounted on the sealing assembly 500.

[0080] In this embodiment, by setting a sealing component 500 in the vacuum chamber 100 and movably setting the motion shaft 200 covered with a sealing sleeve in the sealing component 500, the sealing performance of the vacuum chamber 100 can be guaranteed while the motion shaft 200 moves relative to the vacuum chamber 100, thus ensuring that the vacuum environment inside the vacuum chamber 100 is maintained.

[0081] In summary, the embodiments of the present invention provide a vacuum testing device 10 and a manufacturing method, which has a simple structure and low manufacturing cost. Furthermore, by fitting a sealing sleeve onto the motion shaft 200, the sealing performance of the vacuum chamber 100 is improved when the motion shaft 200 drives the loading member 300 to move relative to the vacuum chamber 100, thereby stabilizing the vacuum environment of the vacuum chamber 100 and improving the accuracy of the test of the sample 20.

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection described in the claims.

Claims

1. A vacuum testing apparatus, characterized in that, Includes vacuum chamber, motion axis, and loading components; The vacuum chamber is used to hold the sample; The motion shaft is movably disposed in the vacuum chamber, with one end of the motion shaft disposed inside the vacuum chamber and connected to the loading member, and the other end disposed outside the vacuum chamber. A sealing sleeve is provided on the outer wall of the motion shaft, and the loading member is used to act on the sample. The vacuum testing device also includes a fixing component, which is fixedly mounted on the vacuum chamber, and the motion shaft is movably mounted on the fixing component; A receiving cavity is provided between the inner wall and the outer wall of the fixing member. The vacuum testing device also includes an expansion ring, which is disposed in the receiving cavity and abuts against the inner wall and the outer wall of the fixing member. The outer wall of the expansion ring is provided with a plurality of first mounting grooves, and each of the plurality of first mounting grooves is provided with a first elastic element, one end of the first elastic element extending out of the first mounting groove abutting against the outer wall of the fixing element.

2. The vacuum testing apparatus according to claim 1, characterized in that, The inner wall of the expansion ring is also provided with a second annular mounting groove, and the second mounting groove is provided with a second annular elastic element, which is in a contracted state.

3. The vacuum testing apparatus according to claim 1, characterized in that, The end of the fixing member that extends into the interior of the vacuum chamber is provided with a fixing seat, and the fixing seat is connected to the inner wall of the vacuum chamber; The vacuum testing device also includes a sealing element, which is sleeved on the outside of the fixing element and located at the end of the fixing element that extends out of the vacuum chamber. The sealing element is fixedly connected to the outer wall of the vacuum chamber.

4. The vacuum testing apparatus according to claim 3, characterized in that, The vacuum testing device further includes a pad, a pad block, and fasteners. The pad is attached to the fixed base, the fixed base has a groove, and the pad has an opening corresponding to the groove. The groove is used to accommodate the pad block, and the fasteners are sequentially inserted through the pad, the pad block, the fixed base, and the vacuum chamber.

5. The vacuum testing apparatus according to claim 1, characterized in that, The vacuum testing device further includes a first hoop and a second hoop. The outer wall of the motion shaft is provided with a first slot and a second slot. The first slot and the second slot are located outside and inside the vacuum chamber, respectively. The first hoop is disposed in the first slot, and the second hoop is disposed in the second slot.

6. The vacuum testing apparatus according to claim 1, characterized in that, The vacuum testing device also includes a limiting component, a threaded hole is provided on the end face of one end of the motion shaft, and a connecting part is provided on the loading component, the connecting part being threadedly engaged with the threaded hole; The motion shaft is also provided with a through hole, which communicates with the threaded hole. The limiting member passes through the through hole and abuts against the connecting part.

7. A method for manufacturing the vacuum testing apparatus according to any one of claims 1-6, characterized in that, The manufacturing method includes: Concrete was poured to create a vacuum chamber, and the sample was placed inside the vacuum chamber; The inner and outer walls of the vacuum chamber are coated with a sealing material; A sealing assembly is provided in the vacuum chamber, and a sealing sleeve is fitted onto the outer wall of the motion shaft and is movably disposed within the sealing assembly.

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