A vacuum cavity heating adsorption force dynamic testing device

Abstract

The application discloses a kind of vacuum cavity heating adsorption force dynamic testing device, it is related to heating adsorption force dynamic testing technical field, including vacuum cavity heating adsorption force machine body;Processing bin is set in the top of vacuum cavity heating adsorption force machine body, and one side is provided with vacuum pump, for the air in the cavity of vacuum cavity heating adsorption force machine body is extracted to form vacuum state;Uniform contact stress component is set in the inside of vacuum cavity heating adsorption force machine body, for the axial compression of sealing surface is dynamically pressed to realize stress uniform distribution;Vertical dynamic compensation component is set in the inside of uniform contact stress component, for increasing the vertical compression deformation area of sealing surface and dynamically compensating to fill gap adaptively;Through the radial extrusion of multiple compensation rollers to the outside of sealing washer, let the upper and lower two sealing surfaces of sealing washer more forcefully close to contact surface, sealing washer compression can be filled with groove more full.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dynamic testing of heating adsorption force, in particular to a vacuum cavity heating adsorption force dynamic testing device. BACKGROUND

[0002] The vacuum cavity heating adsorption force dynamic testing device is mainly used for studying the adsorption performance of materials under different temperatures and vacuum environments. It dynamically tests and evaluates the change of adsorption force of materials by controlling the vacuum degree, temperature and applied external force. The core part of the device is a sealed vacuum cavity. The cavity forms a low-pressure environment by evacuating the air inside through an air evacuation system, thereby simulating the external vacuum environment. The adsorption force of the material is measured in real time by sensors, which can capture the interaction force between the material and gas molecules to help evaluate the strength and change rule of the adsorption force. Dynamic testing means that the adsorption force changes over time during heating or changing the vacuum degree, and the equipment can capture these changes. Dynamic testing refers to continuously changing the vacuum degree, temperature or other environmental conditions during the experiment to observe the change of adsorption force in real time.

[0003] A sealing ring is provided in the vacuum cavity heating adsorption force dynamic testing device. The sealing ring ensures that the vacuum environment inside the cavity is not disturbed by external air and prevents the leakage of test gas. The vacuum cavity and the sealing ring are usually composed of different materials and have different coefficients of thermal expansion. The sealing ring is usually stationary inside the device. The vacuum cavity will produce slight changes in expansion and contraction state, which will cause the sealing ring to be unable to fully adapt to the changes in the surface of the cavity, thereby forming gaps in some parts. The sealing part cannot be in close contact, resulting in a loose seal. Stress is concentrated between the sealing ring and the mounting part, causing the sealing ring to concentrate pressure in the contact area in the groove after being stressed. The stress cannot be evenly dispersed. The surface of the sealing ring is depressed to different degrees due to different forces it bears. The gap cannot be dynamically compensated. SUMMARY

[0004] The purpose of the present application is to provide a vacuum cavity heating adsorption force dynamic testing device to solve the problem of stress concentration between the sealing ring and the mounting part, which causes the sealing ring to concentrate pressure in the contact area in the groove after being stressed. The stress cannot be evenly dispersed. The surface of the sealing ring is depressed to different degrees due to different forces it bears. The gap cannot be dynamically compensated.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a vacuum cavity heating adsorption force dynamic testing device, comprising;

[0006] Vacuum cavity heating adsorption force body;

[0007] A processing chamber is arranged on the top of the vacuum cavity heating adsorption force machine body, and a vacuum pump is arranged on one side of the processing chamber to extract air in the cavity of the vacuum cavity heating adsorption force machine body to form a vacuum state.

[0008] A uniform contact stress assembly is arranged in the vacuum cavity heating adsorption force machine body, and the uniform contact stress assembly comprises a pumping circular pipe, a stress lifting plate and a sealing gasket.

[0009] A vertical dynamic compensation assembly is arranged in the uniform contact stress assembly to increase the vertical compression deformation area of the sealing surface to dynamically compensate and fill the gap.

[0010] A horizontal active gathering assembly is arranged in the vertical dynamic compensation assembly to automatically apply a radial clamping force to the groove to reset the uniform contact stress assembly.

[0011] Preferably, two clamping gaskets are arranged on the top of the vacuum cavity heating adsorption force machine body to support the pipe for extracting air.

[0012] Preferably, the uniform contact stress assembly further comprises a gathering ring, a micro motor, a first gear, a second gear, a reinforcing plate, a first bearing, a support block, a second bearing, a lead screw, a third gear, an embedded rod and a vertical block.

[0013] Preferably, the micro motor is arranged on the top of the vacuum cavity heating adsorption force machine body, and the output shaft is in transmission connection with one end of the first gear.

[0014] Preferably, the first bearing is arranged on the bottom of the reinforcing plate, the lead screw is arranged between the first bearing and the second bearing, and the third gear is sleeved on one end of the lead screw.

[0015] Preferably, the stress lifting plate sleeved on the second gear and the third gear is vertically moved through the meshing connection of the second gear and the third gear, so as to increase the contact area between the sealing gasket and the vertical dynamic compensation assembly, and the stress is uniformly distributed through the axial compression of the sealing surface.

[0016] Preferably, the vertical dynamic compensation assembly comprises a plurality of L-shaped compensation plates and a plurality of compensation rollers, which are used to axially extrude the surface of the sealing gasket during vertical movement, so that the contact pressure is synchronously and adaptively increased with the medium pressure to realize dynamic self-tight sealing.

[0017] Preferably, the transverse active gathering assembly comprises a plurality of gathering bars, a plurality of return springs, a plurality of pressure applying members, a plurality of pressure distribution rods, a plurality of pressure distribution blocks and a plurality of pressure distribution plates, the plurality of return springs are arranged inside the gathering ring for supporting the end of the pressure applying member and abutting against the inner surface of the sealing gasket.

[0018] Preferably, the pressure distribution block is movably sleeved with one end of the pressure distribution rod and is fixed with one side of the pressure applying member through the pressure distribution plate, for enhancing the stability of the impact of the pressure applying member.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] In the present application, the stress lifting plate gradually rises, so that the inner surface of the sealing gasket is in full contact with the outer surface of the pumping circular pipe for pressure application. The sealing gasket is installed in the groove and has an initial pre-tightening force. When subjected to extrusion by the pumping circular pipe, pressure acts on the inner side of the sealing gasket. The pressure forces the sealing gasket to move radially. Since the medium pressure is equal everywhere on the inner side of the sealing gasket, this equal pressure uniformly supports the sealing gasket on the restraining surface of the groove. The soft sealing gasket material will also deform and fill under pressure to ensure contact and automatically compensate for the amount of wear. Through the meshing connection of the second gear and the third gear, the stress lifting plate sleeved therewith is vertically moved, thereby increasing the contact area between the sealing gasket and the vertical dynamic compensation assembly. Dynamic pressure is applied through the axial compression of the sealing surface to achieve uniform stress distribution. The sealing gasket is radially extruded by the plurality of compensation rollers, so that the upper and lower sealing surfaces of the sealing gasket are more forcefully in contact with the contact surface, and the contact area of the two is larger. After extrusion, the sealing gasket can be more fully compressed in the groove.

[0021] In the present application, the return spring plays a buffering role. When the sealing gasket is in a regular state, the return spring is compressed and always wants to return to its original state, which generates a continuous inward pushing force. Even if there is a slight obstacle during the resetting process, the continuous pushing force will always exist. When the surface of the sealing gasket is concave, the inward pushing force will slightly extrude the sealing gasket to the correct position until it is fully reset. The return spring adjusts the rigid pressure applying member into a structure that has a touch and can buffer and self-adapt, thereby safely and gently returning the sealing gasket to its original position while protecting all components from damage. After the sealing gasket is displaced, the return spring can automatically adjust the shape and force by its compression deformation, so that the pressure is evenly distributed on the side of the sealing gasket and balanced from all directions to return it to the center. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1It is a structure schematic view of the main view of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0023] Figure 2 It is a structure schematic view of the internal structure of the main body of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0024] Figure 3 It is a structure schematic view of the partial section of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0025] Figure 4 It is a structure schematic view of the uniform contact stress assembly of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0026] Figure 5 It is a structure schematic view of the vertical dynamic compensation assembly of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0027] Figure 6 It is a structure schematic view of the partial top view of the vacuum cavity heating adsorption force dynamic testing device of the application;

[0028] Figure 7 It is a structure schematic view of the B of the vacuum cavity heating adsorption force dynamic testing device of the application; Figure 4

[0029] Figure 8 It is a structure schematic view of the horizontal active gathering assembly of the vacuum cavity heating adsorption force dynamic testing device of the application.

[0030] In the figure: 100, vacuum cavity heating adsorption force body; 200, processing bin; 300, vacuum pump; 311, clamping gasket; 1, uniform contact stress assembly; 101, pumping circular pipe; 102, gathering ring; 103, micro motor; 104, first gear; 105, second gear; 106, stress lifting plate; 107, sealing gasket; 108, reinforcing plate; 109, first bearing; 110, support block; 111, second bearing; 112, lead screw; 113, third gear; 114, embedded rod; 115, vertical block; 2, vertical dynamic compensation assembly; 201, L-shaped compensation plate; 202, compensation roller; 3, horizontal active gathering assembly; 301, gathering strip; 302, reset spring; 303, pressure applying piece; 304, pressure distribution rod; 305, pressure distribution block; 306, pressure distribution plate. DETAILED DESCRIPTION

[0031] ​The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0032] In order to solve the problem that the stress concentration between the sealing ring and the mounting part in the working process of the existing vacuum cavity heating adsorption force dynamic testing device causes the stress to be concentrated in the contact area in the groove after the sealing ring is stressed, the stress cannot be uniformly dispersed, the surface of the sealing ring appears different degrees of depression because of the different forces borne, and the gap cannot be compensated dynamically, the present application provides a vacuum cavity heating adsorption force dynamic testing device, as shown in Figure 1 and Figure 2 , which comprises:

[0033] a vacuum cavity heating adsorption force body 100;

[0034] a processing bin 200 arranged at the top of the vacuum cavity heating adsorption force body 100 and provided with a vacuum pump 300 on one side, for extracting air in the cavity of the vacuum cavity heating adsorption force body 100 to form a vacuum state;

[0035] a uniform contact stress assembly 1 arranged in the inside of the vacuum cavity heating adsorption force body 100, the uniform contact stress assembly 1 comprising a pumping circular pipe 101, a stress lifting plate 106 and a sealing gasket 107, the stress lifting plate 106 being arranged at the bottom of the pumping circular pipe 101 and provided with a groove at the top end, and the inside of the groove being provided with the sealing gasket 107, for dynamic pressure by axial compression of the sealing surface to realize uniform distribution of stress;

[0036] a vertical dynamic compensation assembly 2 arranged in the inside of the uniform contact stress assembly 1, for dynamic compensation by increasing the vertical compression deformation area of the sealing surface to fill the gap adaptively;

[0037] a horizontal active gathering assembly 3 arranged in the inside of the vertical dynamic compensation assembly 2, for automatically applying a radial clamping force to the groove to reset the uniform contact stress assembly 1.

[0038] First, the workpiece is placed inside the vacuum cavity heating adsorption force machine 100, the workpiece is on the heating base, the force sensor and the temperature sensor are connected and calibrated, the vacuum pump 300 is started, the processing bin 200 extracts the air inside the vacuum cavity heating adsorption force machine 100, the pressure inside the cavity is extracted to the target vacuum degree, the inside of the vacuum cavity heating adsorption force machine 100 is provided with a heating system, the heating system is started, and the vacuum cavity heating adsorption force machine 100 is controlled according to the preset temperature program, at the same time, the core dynamic data acquisition is started synchronously: the force sensor continuously measures the normal adsorption force received by the workpiece; the temperature sensor: real-time monitoring of the surface multi-point temperature of the heating base and the temperature of the workpiece; the vacuum gauge: continuously records the pressure change in the cavity, records the change curve of the adsorption force with the temperature rise, observes whether there is hysteresis and mutation, keeps at the target temperature for a period of time, measures the steady-state adsorption force, and evaluates its stability, records the hysteresis curve of the adsorption force with the temperature drop, investigates its repeatability, changes the vacuum degree under the fixed temperature, tests the relationship between the adsorption force and the pressure, after the test is completed, the software system automatically processes all the synchronous collected data, generates the "adsorption force-temperature-time" relationship curve, turns off the heating system, starts cooling to reduce the cavity temperature to the safety range, fills clean nitrogen into the cavity to restore to normal pressure, takes out the simulation workpiece, and cleans the test base and the sensor area.

[0039] Preferably, according to Figure 3 As shown in the figure, two clamping washers 311 are arranged on the top of the inside of the vacuum cavity heating adsorption force machine 100, which are used to support the pipe for extracting air.

[0040] In order to solve the problem that the sealing ring cannot completely adapt to the change of the surface of the cavity, thereby forming a gap in some parts, and the sealing part cannot be in close contact, the uniform contact stress assembly 1 is arranged to realize the filling of the groove.

[0041] Preferably, the specific working process of the uniform contact stress assembly 1 is as follows, according to Figure 4 As shown in the figure, the uniform contact stress assembly 1 further includes a gathering ring 102, a micro motor 103, a first gear 104, a second gear 105, a reinforcing plate 108, a first bearing 109, a support block 110, a second bearing 111, a lead screw 112, a third gear 113, an embedded rod 114 and a vertical block 115.

[0042] The suction round pipe 101 is movably installed between the two clamping washers 311, a micro motor 103 is fixedly installed on one side of the top of the vacuum cavity heating adsorption force body 100, a first gear 104 is in transmission connection with the output shaft of the micro motor 103, an embedded rod 114 is fixedly installed inside the vacuum cavity heating adsorption force body 100, a vertical block 115 is movably sleeved on one end of the embedded rod 114, a stress lifting plate 106 is fixedly installed on one side of the vertical block 115, a groove is formed in the top end of the stress lifting plate 106, a sealing washer 107 is arranged in the groove, a gathering ring 102 is fixedly installed on the inner surface of the stress lifting plate 106, a second gear 105 is fixedly sleeved on one end of the suction round pipe 101, the first gear 104 is in meshing connection with the second gear 105, a reinforcing plate 108 is fixedly installed on one side of one of the clamping washers 311, a first bearing 109 is fixedly installed on the bottom of the reinforcing plate 108, a supporting block 110 is fixedly installed on one side of the inner wall of the vacuum cavity heating adsorption force body 100, a second bearing 111 is fixedly installed on the top of the supporting block 110, a lead screw 112 is arranged between the first bearing 109 and the second bearing 111, a third gear 113 is fixedly sleeved on one end of the lead screw 112, the third gear 113 is in meshing connection with the second gear 105, and the stress lifting plate 106 is in threaded sleeving with the lead screw 112.

[0043] The suction round pipe 101 is arranged between the two clamping washers 311, and the inner surface of the stress lifting plate 106 is provided with the gathering ring 102.

[0044] The pumping round pipe 101 can rotate between the two clamping washers 311. By starting the micro motor 103, the first gear 104 connected with the output shaft of the micro motor 103 is driven to rotate, further driving the second gear 105 connected with the first gear 104 to rotate, so that the pumping round pipe 101 rotates circumferentially, and the third gear 113 connected with the second gear 105 is driven to rotate, and the screw rod 112 is supported by the first bearing 109 and the second bearing 111 to rotate in place, so that the stress lifting plate 106 moves radially to adjust the height of the sealing washer 107. Since the stress lifting plate 106 is threadedly sleeved with the screw rod 112, and the screw rod 112 rotates radially, the force is transmitted to the stress lifting plate 106, and the vertical block 115 vertically moves at one end of the embedded rod 114, so as to drive the stress lifting plate 106 to move upward. The inner surface of the sealing washer 107 is always in contact with the outer surface of the pumping round pipe 101, and during the upward movement of the sealing washer 107, the sealing washer 107 gradually abuts the inner surface of the pumping round pipe 101, thereby increasing the contact area between the sealing washer 107 and the pumping round pipe 101. The material of the sealing washer 107 is soft rubber. When pressed from top to bottom by hand, the sealing washer 107 will be flattened and expanded outward. The plurality of compensation rollers 202 are located on the right side of the sealing washer 107, which prevents the sealing washer 107 from being tilted out of the groove, thereby ensuring that the sealing washer 107 can always run on the right track. The plurality of compensation rollers 202 radially extrude the outer side of the sealing washer 107, so that the upper and lower sealing surfaces of the sealing washer 107 are more closely contacted with the contact surface, and the contact area between the two is larger. After extrusion, the sealing washer 107 is compressed to fill the groove more fully, reducing the gap between the sealing washer 107 and the groove, thereby increasing the sealing performance of the two.

[0045] The micro motor 103 is arranged at the top of the vacuum cavity heating adsorption force machine body 100, and the output shaft is in transmission connection with one end of the first gear 104. The second gear 105 is sleeved on one end of the pumping round pipe 101. One side of one of the clamping washers 311 is fixedly provided with a reinforcing plate 108. The supporting block 110 is arranged inside the vacuum cavity heating adsorption force machine body 100.

[0046] The first bearing 109 is arranged at the bottom of the reinforcing plate 108. The second bearing 111 is arranged at the top of the supporting block 110. The screw rod 112 is arranged between the first bearing 109 and the second bearing 111. The third gear 113 is sleeved on one end of the screw rod 112. The stress lifting plate 106 is sleeved on one end of the embedded rod 114 through the vertical block 115.

[0047] It should be noted that the first bearing 109 and the second bearing 111 act as freedom restrictors, the two ends of the lead screw 112 are respectively limited by the first bearing 109 and the second bearing 111, the inner ring of the bearing is fastened with the lead screw 112, and the outer ring is fastened with the machine base, allowing the lead screw 112 to rotate around the axis, and the first bearing 109 and the second bearing 111 are respectively fixed end bearings and support end bearings.

[0048] Initially, the top of the sealing gasket 107 is in contact with the outer surface of the pumping round pipe 101, and as the lead screw 112 rotates, the stress lifting plate 106 gradually rises, allowing the inner surface of the sealing gasket 107 to be in full contact with the outer surface of the pumping round pipe 101 and applying pressure. The sealing gasket 107 is installed in the groove and has an initial pre-tightening force. When subjected to extrusion by the pumping round pipe 101, pressure acts on the inside of the sealing gasket 107, and the pressure forces the sealing gasket 107 to move radially. Since the medium pressure inside the sealing gasket 107 is everywhere equal, this equal pressure uniformly supports the sealing gasket 107 on the constraint surface of the groove. The soft sealing gasket 107 material will also deform and fill under pressure to ensure contact, automatically compensate for wear, and prolong the service life. During the movement of the stress lifting plate 106, force is transmitted to the vertical block 115, which moves up and down on one end of the embedded rod 114. Through the support of the vertical block 115 on one side of the stress lifting plate 106, the stress lifting plate 106 moves up and down more stably and at a vertical height.

[0049] To solve the problem that the inner surface of the sealing gasket 107 cannot be rolled to evenly distribute stress due to varying degrees of damage, the vertical dynamic compensation assembly 2 is provided to roll back and forth on the surface of the sealing gasket 107 during its upward movement, achieving uniform stress distribution.

[0050] Further, the specific working process of the vertical dynamic compensation assembly 2 is as follows, according to Figure 5 As shown in the figure, the vertical dynamic compensation assembly 2 includes a plurality of L-shaped compensation plates 201 and a plurality of compensation rollers 202 for axially extruding the surface of the sealing gasket 107 during its vertical movement. When the sealing gasket 107 moves upward, the plurality of compensation rollers 202 rotate on the inner surface of the sealing gasket 107, and the two are always tightly attached. The plurality of compensation rollers 202 repeatedly roll on the surface of the sealing gasket 107, the recessed part of the sealing gasket 107 is rolled flat, and at the same time, the contact pressure is synchronously and adaptively enhanced with the medium pressure, achieving dynamic self-tight sealing.

[0051] The inner surface of the pumping round pipe 101 is fixedly provided with a plurality of L-shaped compensation plates 201, one side of each of the plurality of L-shaped compensation plates 201 is fixedly provided with a compensation roller 202, and the surfaces of the plurality of compensation rollers 202 are respectively in contact with the outer surface of the sealing gasket 107, so as to comb and flatten the surface of the sealing gasket 107 subjected to close rolling.

[0052] Preferably, according to Figure 6 As shown, through the meshing connection of the second gear 105 and the third gear 113, the stress lifting plate 106 sleeved with the second gear 105 and the third gear 113 is vertically moved, and then the contact area between the sealing gasket 107 and the vertical dynamic compensation assembly 2 is increased, and the stress is uniformly distributed through the axial compression of the sealing surface.

[0053] In the rotating process of the screw rod 112, the stress lifting plate 106 is stably driven to move upward, so that the sealing gasket 107 can be more fully contacted with the compensation roller 202, and the plurality of compensation rollers 202 can pressurize the outer surface of the sealing gasket 107.

[0054] The material of the sealing gasket 107 is soft rubber, which is pressed from top to bottom by hand and is flattened, and at the same time, it is inflated to the four directions. The plurality of compensation rollers 202 are located on the right side of the sealing gasket 107, and the function is to prevent the sealing gasket 107 from being skewed out of the groove, so as to ensure that the sealing gasket 107 can always run on the right track. Through the radial extrusion of the plurality of compensation rollers 202 to the outer side of the sealing gasket 107, the upper and lower sealing surfaces of the sealing gasket 107 are more closely contacted with the contact surface, and the contact area of the two is larger. After extrusion, the sealing gasket 107 can be more fully filled with the groove.

[0055] This process of being flattened and being more closely attached is automatically and timely occurred with the movement moment, and the elasticity of the sealing gasket 107 itself is utilized to automatically adjust. When the upper and lower pressures change, the sealing gasket 107 can automatically deform to block the gap with the most appropriate tightness. The greater the pressure is, the more tightly the sealing gasket 107 blocks.

[0056] Further, this process can squeeze out the shaking gap between the sealing gasket 107 and the groove due to wear, so as to make the movement more stable and the sealing more tight.

[0057] In order to solve the problem that the surface of the sealing ring is recessed to different degrees due to different ground forces borne, and the gap cannot be compensated dynamically, the transverse active gathering assembly 3 is arranged to automatically fill the transverse recess on the surface of the sealing gasket 107.

[0058] Further, the specific working process of the transverse active gathering assembly 3 is as follows, according to Figure 7 and Figure 8As shown, the transverse active gathering assembly 3 comprises a plurality of gathering bars 301, a plurality of return springs 302, a plurality of pressure applying members 303, a plurality of pressure distribution rods 304, a plurality of pressure distribution blocks 305 and a plurality of pressure distribution plates 306. The plurality of return springs 302 are arranged inside the gathering ring 102 for supporting the end of the pressure applying member 303 to abut against the inner surface of the sealing gasket 107.

[0059] The plurality of gathering bars 301 are connected inside the gathering ring 102. One end of each of the plurality of gathering bars 301 is fixedly installed with a return spring 302. One end of each of the plurality of return springs 302 is fixedly installed with a pressure applying member 303. One end of each of the plurality of pressure applying members 303 abuts against the outer surface of the sealing gasket 107. The plurality of pressure distribution rods 304 are fixedly installed inside the gathering ring 102. One end of each of the plurality of pressure distribution rods 304 is movably sleeved with a pressure distribution block 305. One side of each of the plurality of pressure distribution blocks 305 is fixedly installed with a pressure distribution plate 306. One side of each of the plurality of pressure distribution plates 306 is fixedly connected with one side of each of the plurality of pressure applying members 303.

[0060] The pressure distribution block 305 movably sleeves one end of the pressure distribution rod 304 and is fixed with one side of the pressure applying member 303 through the pressure distribution plate 306, for enhancing the stability of the impact of the pressure applying member 303.

[0061] The return spring 302 functions as a buffer. When the sealing gasket 107 is in a regular state, the return spring 302 is compressed and always wants to return to the original state, thus generating a continuous inward pushing force. Even if there is a slight obstacle in the return process, the continuous pushing force will always exist. When the surface of the sealing gasket 107 appears to be concave, the inward pushing force will slightly squeeze the sealing gasket 107 to the correct position until it is completely returned.

[0062] The return spring 302 adjusts the rigid pressure applying member 303 into a structure that has a touch and a buffer and is self-adaptable, so as to safely and gently return the sealing gasket 107 to the original position while protecting all components from damage.

[0063] Rigid means that the pressure applying member 303 is stationary and in a rigid state when it is closely attached to the surface of the sealing gasket 107. When a gap appears between the pressure applying member 303 and the sealing gasket 107, the pressure applying member 303 will move to the position close to the sealing gasket 107 due to the reduction of pressure by the return spring 302 and the elastic effect, which means that the pressure applying member 303 breaks the rigid state and forms a movable state.

[0064] After the sealing gasket 107 is displaced, the return spring 302 can automatically adjust the shape and force by its compression deformation, so as to evenly distribute the pressure on the side surface of the sealing gasket 107 and balance it to the center from all directions instead of pushing it from a point.

[0065] Working principle: vacuum cavity heating adsorption force dynamic testing device is mainly used for studying the adsorption performance of materials under different temperatures and vacuum environment. It dynamically tests and evaluates the change of adsorption force of materials by controlling vacuum degree, temperature and external force. The core part of the device is a sealed vacuum cavity. The cavity forms a low pressure environment by pumping out the air inside through the air pumping system, simulating the external vacuum environment. The adsorption force of the material is measured in real time by sensors, which can capture the interaction force between the material and gas molecules, helping to evaluate the strength and change rule of the adsorption force. Dynamic testing means that the adsorption force changes over time during heating or changing the vacuum degree. The device can capture these changes. Dynamic testing refers to continuously changing the vacuum degree, temperature or other environmental conditions during the experiment, and observing the change of adsorption force in real time. The vacuum cavity heating adsorption force dynamic testing device is provided with a sealing ring. The sealing ring ensures that the vacuum environment inside the cavity is not disturbed by external air and prevents the leakage of test gas. The vacuum cavity and the sealing ring are usually composed of different materials, and their thermal expansion coefficients are different. The sealing ring is usually stationary in the device. The vacuum cavity expands and contracts locally, which causes a small change. This phenomenon causes the sealing ring to be unable to fully adapt to the change of the cavity surface, forming a gap in some parts, so that the sealing part cannot be in close contact, resulting in loose sealing. The stress concentration between the sealing ring and the mounting part causes the sealing ring to concentrate stress in the contact area in the groove after being stressed. The stress cannot be evenly distributed, and the surface of the sealing ring is depressed to different degrees due to different forces. The gap cannot be compensated dynamically. The pumping circular pipe 101 can rotate between the two clamping washers 311. By starting the micro motor 103, the first gear 104 connected with the output shaft of the micro motor 103 is driven to rotate, further driving the second gear 105 connected with the first gear 104 to rotate, so that the pumping circular pipe 101 rotates in a circle, and the third gear 113 connected with the second gear 105 is also driven to rotate. The screw rod 112 is supported by the first bearing 109 and the second bearing 111 and keeps rotating in place. Since the stress lifting plate 106 is threadedly sleeved with the screw rod 112, and the screw rod 112 keeps rotating radially, the force is transmitted to the stress lifting plate 106. The vertical block 115 moves vertically at one end of the embedded rod 114, thereby driving the stress lifting plate 106 to move upward. The inner surface of the sealing washer 107 is always in contact with the outer surface of the pumping circular pipe 101. During the upward movement, the contact area between the sealing washer 107 and the pumping circular pipe 101 is increased. The stress is uniformly distributed by dynamic pressure through the axial compression of the sealing surface. Initially, the top of the sealing washer 107 is in contact with the outer surface of the pumping circular pipe 101. As the screw rod 112 rotates, the stress lifting plate 106 gradually rises, making the inner surface of the sealing washer 107 fully contact and press the outer surface of the pumping circular pipe 101. The sealing washer 107 is installed in the groove and has an initial pre-tightening force.When subjected to extrusion with the pumping round pipe 101, pressure acts on the inside of the sealing washer 107, and the pressure forces the sealing washer 107 to move radially, and because the medium pressure is equal everywhere on the inside of the sealing washer 107, this equal pressure uniformly supports the sealing washer 107 on the constraint surface of the groove, and the soft sealing washer 107 material will also deform and fill under pressure, ensuring contact, automatically compensating for wear and tear, and prolonging the life. The material of the sealing washer 107 is soft rubber, which can be flattened by pressing it from top to bottom with the hand, and at the same time it will expand outward. Multiple compensation rollers 202 are located on the right side of the sealing washer 107, which prevent the sealing washer 107 from being skewed out of the groove, thereby ensuring that the sealing washer 107 can always be on the right track. Through the radial extrusion of the multiple compensation rollers 202 on the outside of the sealing washer 107, the upper and lower sealing surfaces of the sealing washer 107 are forced to more closely contact the contact surface, and the contact area of the two is larger. After extrusion, the sealing washer 107 can be compressed to be more full of the groove. The return spring 302 plays a buffering role. When the sealing washer 107 is in a regular state, the return spring 302 is compressed and always wants to return to its original state, which generates a continuous inward pushing force. Even if there is a small obstacle during the resetting process, this continuous pushing force will always exist. When the surface of the sealing washer 107 appears concave, this inward pushing force will slightly extrude the sealing washer 107 to the correct position until it is fully reset.

[0066] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions described in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A dynamic testing device for adsorption force in a vacuum chamber under heating, characterized in that, include: Vacuum chamber heating adsorption force body (100); The processing chamber (200) is located on top of the vacuum chamber heating and adsorption force machine body (100), and a vacuum pump (300) is provided on one side to extract the air from the vacuum chamber heating and adsorption force machine body (100) to form a vacuum state. The uniform contact stress assembly (1) is installed inside the vacuum chamber heating adsorption force body (100). The uniform contact stress assembly (1) includes a pumping circular tube (101), a stress lifting plate (106), and a sealing gasket (107). The stress lifting plate (106) is installed at the bottom of the pumping circular tube (101) and has a groove at its top. The sealing gasket (107) is installed inside the groove to dynamically apply pressure by axial compression of the sealing surface, thereby achieving uniform stress distribution. The vertical dynamic compensation component (2) is set inside the uniform contact stress component (1) to increase the vertical compression deformation area of ​​the sealing surface for dynamic compensation so as to adaptively fill the gap. The transverse active gathering component (3) is set inside the vertical dynamic compensation component (2) and is used to automatically apply radial clamping force to the groove to reset the uniform contact stress component (1); The top of the vacuum chamber heating adsorption force machine body (100) is provided with two clamping washers (311) for supporting the pipes used for air extraction. The uniform contact stress assembly (1) further includes a gathering ring (102), a micro motor (103), a first gear (104), a second gear (105), a reinforcing plate (108), a first bearing (109), a support block (110), a second bearing (111), a lead screw (112), a third gear (113), an embedded rod (114), and a vertical block (115). The extraction circular tube (101) is disposed between two clamping washers (311), and the inner surface of the stress support plate (106) is provided with a gathering ring (102). The micro motor (103) is set on the top of the vacuum chamber heating adsorption force machine body (100), and the output shaft is connected to one end of the first gear (104) for transmission. The second gear (105) is sleeved on one end of the pumping round tube (101) for pumping the round tube (101) to make circumferential rotation. The first bearing (109) is disposed at the bottom of the reinforcing plate (108), the lead screw (112) is disposed between the first bearing (109) and the second bearing (111), and the third gear (113) is sleeved on one end of the lead screw (112); By meshing the second gear (105) and the third gear (113), the stress support plate (106) fitted with it can be driven to move vertically, thereby increasing the contact area between the sealing gasket (107) and the vertical dynamic compensation component (2), and dynamic pressure is applied through the axial compression of the sealing surface to achieve uniform stress distribution.

2. The vacuum chamber heating adsorption force dynamic testing device according to claim 1, characterized in that: The vertical dynamic compensation component (2) includes multiple L-shaped compensation plates (201) and multiple compensation rollers (202), which are used to axially compress the surface of the sealing gasket (107) during the vertical movement, so that the contact pressure is synchronously and adaptively enhanced with the medium pressure, thereby achieving dynamic self-tightening sealing.

3. The vacuum chamber heating adsorption force dynamic testing device according to claim 1, characterized in that: The transverse active gathering component (3) includes multiple gathering bars (301), multiple return springs (302), multiple pressure-applying components (303), multiple pressure-distributing rods (304), multiple pressure-distributing blocks (305), and multiple pressure-distributing plates (306). The multiple return springs (302) are all located inside the gathering ring (102) to support the end of the pressure-applying component (303) to abut against the inner surface of the sealing gasket (107).

4. The vacuum chamber heating adsorption force dynamic testing device according to claim 3, characterized in that: The pressure dividing block (305) is movably sleeved with one end of the pressure dividing rod (304), and is fixed to one side of the pressure applying member (303) by the pressure dividing plate (306) to enhance the stability of the impact of the pressure applying member (303).

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