Adjustable pneumatic bellows pressure test special equipment

Abstract

The application discloses a kind of adjustable pneumatic bellows pressure test special equipment, it is related to bellows detection technical field, including workbench, sealing sleeve, sealing ring, lever arm, cylinder, pressure plate, eccentric compression block, V-shaped positioning block.In the application, eccentric compression block of movable adjustable acts on the axis on the left and right sides of sealing port, to ensure that the compression force is uniform and efficient;Can freely extend and retract and adjust the diameter of sealing surface positioning at will, can quickly position the position of sealing surface in use, prevent the impact on sealing after putting off;Can adjust the width according to the size of each size bellows sealing surface, accurately act on the sealing surface during clamping action to perform compression action;Linkage treatment is carried out to cylinder and V-shaped positioning block, adjust the position of V-shaped positioning block;The structure of sealing ring is designed, so that the sealing ring is convenient for sealing treatment to bellows of different sizes, can link up and adjust the up and down movement of cylinder and the expansion and contraction of sealing ring.

Description

A special equipment for pressure testing of adjustable pneumatic bellows Technical Field

[0001] This invention relates to the field of bellows testing technology, specifically to an adjustable pneumatic bellows pressure testing device. Background Technology

[0002] Bellows valves are frequently used in oil and gas industrial pipelines, and the core component of a bellows valve is the bellows itself. Bellows mainly include metal bellows, bellows expansion joints, bellows heat exchange tubes, diaphragms, and metal hoses. Bellows can be classified into metal bellows and non-metal bellows according to their constituent materials; and into single-layer and multi-layer bellows according to their structure. Single-layer bellows are more commonly used; multi-layer bellows offer higher strength, better durability, and lower stress. Common materials for bellows include bronze, brass, stainless steel, Monel alloy, and Inconel alloy. Before final assembly, bellows valves typically involve welding the bellows and valve stem together. This welding process can damage the bellows, such as through weld porosity, hot cracking, or stress-induced cracking; therefore, a leak test of the bellows is necessary.

[0003] The conventional experimental method involves manually screwing two steel pipes together and then inflating them to inspect the bellows. However, this method has the following significant drawbacks: the installation and disassembly speed is too slow, the seal is unstable, and the work efficiency is low. Summary of the Invention

[0004] The purpose of this invention is to provide a special device for pressure testing of adjustable pneumatic bellows, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a special device for pressure testing of adjustable pneumatic bellows, comprising a workbench, a sealing sleeve provided at the center of the bottom of the workbench, the sealing sleeve extending to the top of the workbench, a sealing ring provided on the top of the workbench outside the sealing sleeve, a lever arm movably connected to the top of the workbench outside the sealing ring, a support rod rotatably connected to one end of the lever arm, a cylinder provided on the top of the workbench outside the other end of the lever arm, a pressure plate provided above the lever arm on the output shaft of the cylinder, a push block provided on the outer wall of the lever arm below the pressure plate, a bottom of the support rod fixedly connected to the top of the workbench, and a spring provided on the outer wall of the support rod below the lever arm; eccentric clamping blocks movably connected to both sides of the sealing ring on the outer wall of the lever arm, and a V-shaped positioning block matching the sealing ring movably provided on the side of the top of the workbench away from the lever arm.

[0006] Furthermore, the top of the worktable is provided with a rotatably connected ball screw on one side of the cylinder. A movably connected screw nut is fitted onto the outer wall of the ball screw. The pressure plate is fixedly connected to the outer wall of the screw nut. A through groove is formed on the surface of the V-shaped positioning block. A rack is provided on one side of the inner wall of the through groove. A gear that meshes with the rack is provided on the top of the worktable inside the through groove. A first support plate is rotatably connected to the bottom of the ball screw inside the worktable. A second support plate is rotatably connected to the bottom of the gear inside the worktable. The first support plate is connected to the second support plate via a track. An oil reservoir is provided inside between the cylinder and the ball screw. A sealing plate is provided on the top of the inner wall of the oil reservoir. A connecting rod is provided on the top of the sealing plate. A connecting plate is provided on the top of the connecting rod. The pressure plate is fixedly connected to the connecting plate. The sealing ring has a first liquid reservoir, a second liquid reservoir, and a third liquid reservoir inside. The second liquid reservoir is located between the first liquid reservoir and the third liquid reservoir. A connecting pipe is provided between the bottom of the oil reservoir and the first liquid reservoir. Several first through holes are provided between the first liquid reservoir and the second liquid reservoir. Several second through holes are provided between the second liquid reservoir and the third liquid reservoir.

[0007] Furthermore, the outer wall of the sealing sleeve is provided with an inlet ball valve and an exhaust ball valve, and the bottom of the workbench is provided with a control switch and a pressure reducing valve. The control switch directly controls the air source of the cylinder and controls the extension and retraction of the cylinder, while the pressure reducing valve adjusts the pressure of the experimental air source entering the sealing sleeve according to different requirements.

[0008] Furthermore, the eccentric clamping block is rotatably connected to the lever arm via a connecting shaft. A torsion spring is provided between the connecting shaft and the eccentric clamping block. The inner wall of the lever arm is provided with a movable groove that matches the eccentric clamping block, ensuring that the eccentric clamping block clamps the bellows, which facilitates the subsequent clamping process of the bellows.

[0009] Furthermore, the top of the workbench is provided with a first guide groove that matches the V-shaped positioning block. The guide groove is perpendicular to the lever arm. The inner wall of the V-shaped positioning block is provided with a second guide groove that matches the gear. The second guide groove is connected to the through groove. The first guide groove and the second guide groove are parallel to each other to ensure the stability of the movement of the V-shaped positioning block and to ensure the uniformity of the force applied by the V-shaped positioning block to the corrugated pipe.

[0010] Furthermore, the workbench is provided with mounting slots that match the first support plate and the second support plate, and the workbench is provided with a mounting cavity that matches the track between the two mounting slots, providing installation and movement space for the first support plate, the second support plate, and the track.

[0011] Furthermore, the outer wall of the pressure plate is fixedly connected to the connecting plate via a first support strip, and the outer wall of the connecting plate is fixedly connected to the lead screw nut via a second support strip, ensuring that the pressure plate simultaneously drives the connecting plate and the lead screw nut to move up and down.

[0012] Furthermore, the top of the workbench is provided with an assembly groove outside the sealing ring, the inside of the oil storage cavity is provided with a vertical sliding groove, and the outer wall of the sealing plate is provided with a slider that matches the sliding groove, which can effectively enhance the stability of the movement of the sealing plate.

[0013] Furthermore, the first liquid storage chamber is located outside the third liquid storage chamber, and the height of the first liquid storage chamber is less than the height of the second liquid storage chamber, and the height of the second liquid storage chamber is less than the height of the third liquid storage chamber, thereby improving the sealing effect of the bellows.

[0014] Furthermore, the height of the first through hole is greater than the height of the connecting pipe, and the height of the second through hole is greater than the height of the first through hole, which makes the sealing ring more effective in sealing the bellows.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] 1. This invention, through the setting of a workbench, sealing sleeve, sealing ring, lever arm, cylinder, pressure plate, eccentric clamping block, and V-shaped positioning block, allows the bellows to be fitted onto the sealing ring and clamped by the cylinder and lever arm. The cylinder acts as the driving force, applying pressure to the end of the lever arm. Since the lever arm, cylinder, and sealing port cannot be installed and operate coaxially (otherwise, the bellows cannot be installed for experimentation), the lever arm is specially designed with an eccentric clamping block structure. The adjustable eccentric clamping block acts on the left and right sides of the sealing port axis, ensuring uniform and efficient clamping force. One end of the lever arm can rotate and swing along the support rod, while the other end contacts the cylinder and pressure plate, receiving the tension from the cylinder's extension and retraction. The eccentric clamping block in the middle of the lever arm clamps the bellows port, thus transmitting clamping force to the bellows sealing port, sealing the end... The clamping force is several times greater than that of the threaded engagement method. Furthermore, by controlling a pneumatic switch, the cylinder can instantly pull the lever arm to clamp the sealing port, increasing the clamping speed by more than ten times compared to the original manual engagement method. An adjustable V-shaped positioning block is designed, allowing for free extension and retraction to adjust the sealing surface diameter at any time, enabling rapid positioning of the sealing surface during use and preventing misalignment from affecting the seal. An adjustable eccentric clamping block is installed on the lever arm, allowing for width adjustment according to the size of the bellows sealing surface of various sizes, accurately acting on the sealing surface during clamping. The cylinder and V-shaped positioning block are linked together, connected by a ball screw and screw nut. The lifting and lowering of the screw nut drives the rotation of the ball screw, which in turn drives the gear. The gear meshes with the inner rack of the V-shaped positioning block, adjusting its position.

[0017] 2. This invention, by setting up an oil storage chamber, a sealing plate, a connecting plate, a first liquid storage chamber, a second liquid storage chamber, and a third liquid storage chamber, allows the pressure plate to move downwards, driving the support plate downwards. The support plate's downward movement, in turn, drives the connecting rod downwards, which in turn drives the sealing plate downwards. The sealing plate downwards compresses the oil in the oil storage chamber, and the oil is transported through the sealing ring of the connecting pipe box. The oil then enters the first liquid storage chamber through the connecting pipe. The oil in the first liquid storage chamber enters the second liquid storage chamber through the first through-hole, and the oil in the second liquid storage chamber enters the third liquid storage chamber through the second through-hole. The three liquid storage chambers cooperate to adjust the inner diameter of the sealing ring, and the sealing ring tightens the inner wall of the bellows. Applying a seal effectively enhances the sealing effect of the sealing ring on the bellows, and can also seal bellows of different inner diameters, ensuring the accuracy of bellows testing. When the cylinder extends, it drives the pressure plate and connecting plate to move upward, which in turn drives the sealing plate upward. The oil pressure inside the oil reservoir decreases, and the oil in the first, second, and third oil reservoirs flows back into the reservoir. The sealing ring separates from the inner wall of the bellows, facilitating the disassembly and assembly of the bellows after testing. The structure of the sealing ring is designed to make it easier to seal bellows of different sizes, and the up-and-down movement of the cylinder can be linked with the expansion and contraction of the sealing ring for adjustment. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 is a top view of the entire invention;

[0020] Figure 2 is an enlarged schematic diagram of point A in Figure 1 of this invention;

[0021] Figure 3 is a front view of the entire invention;

[0022] Figure 4 is a bottom view of the entire invention;

[0023] Figure 5 is a front sectional view of the entire invention;

[0024] Figure 6 is an enlarged schematic diagram of point B in Figure 1 of this invention;

[0025] Figure 7 is a front sectional view of the worktable of the present invention;

[0026] In the diagram: 1. Workbench; 2. Sealing sleeve; 3. Sealing ring; 4. Lever arm; 5. Support rod; 6. Spring; 7. Cylinder; 8. Pressure plate; 9. Push block; 10. Eccentric clamping block; 11. V-shaped positioning block; 12. Inlet ball valve; 13. Exhaust ball valve; 14. Control switch; 15. Pressure reducing valve; 16. Ball screw; 17. Screw nut; 18. Through groove; 19. Rack; 20. Gear; 21. Oil reservoir; 22. Sealing plate; 23. Connecting rod; 24. Connecting disc; 25. First liquid reservoir; 26. Second liquid reservoir; 27. Third liquid reservoir; 28. Connecting pipe; 29. ​​First through hole; 30. Second through hole; 31. Movable groove; 32. Assembly groove; 33. Slide groove; 34. Slider. Detailed Implementation

[0027] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] As shown in Figures 1-7, an adjustable pneumatic bellows pressure testing device includes a workbench 1. A sealing sleeve 2 is located at the center of the bottom of the workbench 1, extending to the top of the workbench 1. A sealing ring 3 is located on the outside of the sealing sleeve 2 at the top of the workbench 1. A lever arm 4 is movably connected to the top of the workbench 1 outside the sealing ring 3. A support rod 5 is rotatably connected to one end of the lever arm 4. A cylinder 7 is located on the outside of the other end of the lever arm 4 at the top of the workbench 1. A pressure plate 8 is located above the lever arm 4 on the output shaft of the cylinder 7. A push block 9 is located below the pressure plate 8 on the outer wall of the lever arm 4. The bottom of the support rod 5 is fixedly connected to the top of the workbench 1. A spring 6 is sleeved on the outer wall of the support rod 5 below the lever arm 4. Movable connections are located on both sides of the sealing ring 3 on the outer wall of the lever arm 4. The eccentric clamping block 10 is provided. A V-shaped positioning block 11 matching the sealing ring 3 is movably provided on the top of the worktable 1 away from the lever arm 4. A ball screw 16 is rotatably connected to the top of the worktable 1 on the side of the cylinder 7. A screw nut 17 is movably connected to the outer wall of the ball screw 16. The pressure plate 8 is fixedly connected to the outer wall of the screw nut 17. A through groove 18 is opened on the surface of the V-shaped positioning block 11. A rack 19 is provided on one side of the inner wall of the through groove 18. A gear 20 meshing with the rack 19 is provided on the top of the worktable 1 inside the through groove 18. A first support plate rotatably connected to the bottom of the ball screw 16 inside the worktable 1 is provided. A second support plate rotatably connected to the bottom of the gear 20 inside the worktable 1 is provided. The first support plate is connected to the second support plate through a track.

[0029] The outer wall of the sealing sleeve 2 is provided with an inlet ball valve 12 and an exhaust ball valve 13. The bottom of the workbench 1 is provided with a control switch 14 and a pressure reducing valve 15. The air source is separately introduced into the control switch 14 and the pressure reducing valve 15. The control switch 14 directly controls the air source of the cylinder 7 to control the extension and retraction of the cylinder 7, while the pressure reducing valve 15 adjusts the pressure of the experimental air source entering the sealing sleeve 2 according to different requirements. The inlet ball valve 12 and the exhaust ball valve 13 are used for air intake and exhaust of the sealing sleeve 2.

[0030] The eccentric clamping block 10 is rotatably connected to the lever arm 4 via a connecting shaft. A torsion spring is provided between the connecting shaft and the eccentric clamping block 10. The inner wall of the lever arm 4 is provided with a movable groove 31 that matches the eccentric clamping block 10, ensuring that the eccentric clamping block 10 can rotate along the connecting shaft. At the same time, the torsion spring provides torsional support to the eccentric clamping block 10, ensuring that the eccentric clamping block 10 clamps the bellows, which facilitates the subsequent clamping process of the bellows. The movable groove 31 provides movement space for the eccentric clamping block 10.

[0031] The top of the workbench 1 is provided with a first guide groove that matches the V-shaped positioning block 11. The guide groove is perpendicular to the lever arm 4. The inner wall of the V-shaped positioning block 11 is provided with a second guide groove that matches the gear 20. The second guide groove is connected to the through groove 18. The first guide groove and the second guide groove are parallel to each other. The first guide groove guides the V-shaped positioning block 11 to ensure the stability of the movement of the V-shaped positioning block 11 and to ensure the uniformity of the force applied by the V-shaped positioning block 11 to the bellows. The second guide groove guides the gear 20 and can further enhance the stability of the V-shaped positioning block 11.

[0032] The workbench 1 has mounting slots that match the first support plate and the second support plate inside. The workbench 1 also has a mounting cavity that matches the track between the two mounting slots. The mounting slots provide mounting space for the first support plate and the second support plate, which can effectively ensure the installation and movement space for the first support plate and the second support plate. The mounting cavity provides installation and movement space for the track.

[0033] The outer wall of the pressure plate 8 is fixedly connected to the connecting plate 24 via the first support bar, and the outer wall of the connecting plate 24 is fixedly connected to the lead screw nut 17 via the second support bar, ensuring that the pressure plate simultaneously drives the connecting plate 24 and the lead screw nut 17 to move up and down.

[0034] The specific implementation method is as follows: A workbench 1, sealing sleeve 2, sealing ring 3, lever arm 4, cylinder 7, pressure plate 8, eccentric clamping block 10, and V-shaped positioning block 11 are set up. The bellows is fitted onto the sealing ring 3 and clamped by the cylinder 7 and lever arm 4. The cylinder 7 acts as the driving force, applying pressure to the end of the lever arm 4. Since the three force points—lever arm 4, cylinder 7, and sealing port—cannot be installed and operate coaxially, otherwise the bellows cannot be installed for experimentation, the lever arm 4 is specially designed with an eccentric clamping block 10 structure. The adjustable eccentric clamping block 10 acts on the left and right axes of the sealing port, ensuring uniform and efficient clamping force. One end of the lever arm 4 can rotate and swing along the support rod 5, and the other end of the lever arm 4... The end of the lever arm 4 contacts the pressure plate of the cylinder 7 and is pulled by the extension and retraction of the cylinder 7. The eccentric clamping block 10 in the middle of the lever arm 4 clamps the bellows port, so that the eccentric clamping block 10 can transmit the clamping force to the bellows sealing port, clamping the sealing port. The clamping force is at least several times greater than that of the threaded engagement method. By controlling the pneumatic switch, the cylinder can pull the lever arm 4 to clamp the sealing port instantly, which is more than ten times faster than the original manual engagement method. An adjustable V-shaped positioning block 11 is designed, which can freely extend and retract to adjust the positioning diameter of the sealing surface at any time. It can quickly position the sealing surface during use and prevent the sealing from being affected by misalignment. An adjustable eccentric clamping block 10 is installed on the lever arm 4, which can be adjusted according to the... The sealing surface width of bellows of various sizes can be adjusted to accurately apply pressure to the sealing surface during clamping. The clamping force comes from cylinder 7. During the extension and retraction of cylinder 7, pressure plate 8 moves up and down. During the downward movement of pressure plate 8, one end of lever arm 4 is pressed down by push block 9, and the other end of lever arm 4 moves down under the elastic support of spring 6, thereby driving eccentric clamping block 10 to move down and clamp the bellows. During the downward movement of pressure plate 8, lead screw nut 17 moves down. During the downward movement of lead screw nut 17, ball screw 16 rotates, causing the first support plate to rotate inside the worktable 1. The first support plate drives the second support plate through the track. The support plate rotates, and the second support plate drives the gear 20 to rotate. The gear 20 meshes with the rack 19. During the rotation of the gear 20, the rack 19 inside the through groove 18 moves. The rack 19 drives the V-shaped positioning block 11 to move. The V-shaped positioning block 11 moves toward the sealing ring 3. The V-shaped positioning block 11 and the eccentric pressing block 10 cooperate to clamp and fix the bellows at multiple points, which can effectively enhance the clamping effect of the bellows. When the cylinder 7 extends, it drives the pressure plate 8 and the lead screw nut 17 to move upward. When the lead screw nut 17 moves upward, the gear 20 moves in the opposite direction. The gear 20 drives the rack 19 to move in the opposite direction, thereby driving the V-shaped positioning block 11 away from the bellows, and then contacting the clamping treatment of the bellows.The cylinder 7 and the V-shaped positioning block 11 are linked together. The ball screw 16 and the screw nut 17 are connected. The lifting and lowering of the screw nut 17 drives the ball screw 16 to rotate. The rotation of the ball screw 16 drives the gear 20 to rotate. The gear 20 meshes with the rack 19 on the inner side of the V-shaped positioning block 11 to adjust the position of the V-shaped positioning block 11.

[0035] As shown in Figures 1 and 5-6, an adjustable pneumatic bellows pressure testing device is provided. Inside the workbench 1, between the cylinder 7 and the ball screw 16, there is an oil storage chamber 21. A movably connected sealing plate 22 is provided on the top of the inner wall of the oil storage chamber 21. A connecting rod 23 is provided on the top of the sealing plate 22, and a connecting plate 24 is provided on the top of the connecting rod 23. The pressure plate 8 is fixedly connected to the connecting plate 24. Inside the sealing ring 3, there are a first liquid storage chamber 25, a second liquid storage chamber 26, and a third liquid storage chamber 27. The second liquid storage chamber 26 is located between the first liquid storage chamber 25 and the third liquid storage chamber 27. A connecting pipe 288 is provided between the bottom of the oil storage chamber 21 and the first liquid storage chamber 25. Several first through holes 29 are provided between the first liquid storage chamber 25 and the second liquid storage chamber 26, and several second through holes 30 are provided between the second liquid storage chamber 26 and the third liquid storage chamber 27.

[0036] The top of the workbench 1 is provided with an assembly groove 32 on the outside of the sealing ring 3. The oil storage cavity 21 is provided with a vertical sliding groove 33. The outer wall of the sealing plate 22 is provided with a slider 34 that matches the sliding groove 33. The assembly groove 32 provides assembly space for the bellows outside the sealing ring 3. During the lifting and lowering movement of the sealing plate 22, the slider 34 moves along the sliding groove 33, which can effectively enhance the stability of the movement of the sealing plate 22.

[0037] The first liquid storage chamber 25 is located outside the third liquid storage chamber 27. The height of the first liquid storage chamber 25 is less than the height of the second liquid storage chamber 26, and the height of the second liquid storage chamber 26 is less than the height of the third liquid storage chamber 27. The first liquid storage chamber 25, the second liquid storage chamber 26, and the third liquid storage chamber 27 cooperate with each other to ensure the uniformity and stability of the force on the sealing ring 3, thereby improving the sealing effect on the bellows.

[0038] The height of the first through hole 29 is greater than the height of the connecting pipe 288, and the height of the second through hole 30 is greater than the height of the first through hole 29, ensuring that the oil in the oil storage chamber first fills the first liquid storage chamber 25, then the second liquid storage chamber 26, and finally the third liquid storage chamber 27, so that the sealing ring 3 has a better sealing effect on the bellows.

[0039] The specific implementation method is as follows: In use, by setting up an oil storage chamber 21, a sealing plate 22, a connecting plate 24, a first liquid storage chamber 25, a second liquid storage chamber 26, and a third liquid storage chamber 27, during the downward movement of the pressure plate 8, the connecting plate 24 is driven to move downward. During the downward movement of the connecting plate 24, the connecting rod 23 is driven to move downward, which in turn drives the sealing plate 22 to move downward. The sealing plate 22 squeezes the oil in the oil storage chamber 21 downward. The oil is transported through the connecting pipe 28 and the sealing ring 3. The oil enters the first liquid storage chamber 25 through the connecting pipe 28. The oil in the first liquid storage chamber 25 enters the second liquid storage chamber 26 through the first through hole 29. The oil in the second liquid storage chamber 26 enters the third liquid storage chamber 27 through the second through hole 30. The three liquid storage chambers cooperate to adjust the inner diameter of the sealing ring 3. The sealing ring 3 is adjusted to tightly seal the inner wall of the bellows, effectively enhancing the sealing effect of the sealing ring 3 on the bellows. It can also seal bellows of different inner diameters, ensuring the accuracy of bellows testing. When the cylinder 7 extends, it drives the pressure plate 8 and connecting plate 24 upwards, which in turn drives the sealing plate 22 upwards. The oil pressure inside the oil storage chamber 21 decreases, and the oil in the first, second, and third storage chambers 25, 26, and 27 flows back into the oil storage chamber 21. The sealing ring 3 separates from the inner wall of the bellows, facilitating disassembly and assembly of the bellows after testing. The structure of the sealing ring 3 is designed to make it easier to seal bellows of different sizes. The up-and-down movement of the cylinder 7 can be linked to the expansion and contraction of the sealing ring 3 for adjustment.

[0040] Working principle of this invention:

[0041] Referring to Figures 1-7 in the instruction manual, the system comprises a worktable 1, a sealing sleeve 2, a sealing ring 3, a lever arm 4, a cylinder 7, a pressure plate 8, an eccentric clamping block 10, and a V-shaped positioning block 11. The adjustable eccentric clamping block 10 acts on the left and right axes of the sealing port, ensuring uniform and efficient clamping force. The eccentric clamping block 10 transmits clamping force to the bellows sealing port, tightening it with a clamping force several times greater than that of the threaded engagement method. Furthermore, by controlling the pneumatic switch, the cylinder can instantly pull the lever arm 4 to clamp the sealing port, increasing the clamping speed by more than ten times compared to the original manual engagement method. An adjustable V-shaped positioning block 11 is also included. The sealing surface positioning diameter can be freely extended and adjusted at any time, and the sealing surface position can be quickly positioned during use to prevent the sealing from being affected by misalignment. An adjustable eccentric clamping block 10 is installed on the lever arm 4, which can adjust the width according to the size of the bellows sealing surface of each size, and accurately act on the sealing surface to perform clamping action at any time during the clamping action. The cylinder 7 and the V-shaped positioning block 11 are linked together, and the ball screw 16 and the screw nut 17 are connected. The lifting and lowering of the screw nut 17 drives the ball screw 16 to rotate. The rotation of the ball screw 16 drives the gear 20 to rotate. The gear 20 meshes with the rack 19 on the inner side of the V-shaped positioning block 11 to adjust the position of the V-shaped positioning block 11.

[0042] Referring to Figures 1 and 5-6 in the instruction manual, by setting up an oil storage chamber 21, a sealing plate 22, a connecting plate 24, a first liquid storage chamber 25, a second liquid storage chamber 26, and a third liquid storage chamber 27, the three liquid storage chambers cooperate to adjust the inner diameter of the sealing ring 3. The sealing ring 3 tightly seals the inner wall of the bellows, which can effectively enhance the sealing effect of the sealing ring 3 on the bellows. At the same time, it can seal bellows with different inner diameters, ensuring the accuracy of bellows detection. The structure of the sealing ring 3 is designed to make it easier to seal bellows of different sizes. The up and down movement of the cylinder 7 can be linked with the expansion and contraction of the sealing ring 3 for adjustment.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A special device for pressure testing of adjustable pneumatic bellows, comprising a workbench (1), characterized in that: The workbench (1) has a sealing sleeve (2) at its bottom center, which extends to the top of the workbench (1). A sealing ring (3) is provided on the top of the workbench (1) outside the sealing sleeve (2). A lever arm (4) is provided on the top of the workbench (1) outside the sealing ring (3). A support rod (5) is fitted on one end of the lever arm (4). A cylinder (7) is provided on the top of the workbench (1) outside the other end of the lever arm (4). The output shaft of the cylinder (7) is located on the lever arm. (4) A pressure plate (8) is provided above, and a push block (9) is provided on the outer wall of the lever arm (4) below the pressure plate (8). The bottom of the support rod (5) is fixedly connected to the top of the workbench (1), and a spring (6) is sleeved on the outer wall of the support rod (5) below the lever arm (4). An eccentric clamping block (10) is provided on both sides of the outer wall of the lever arm (4) and is movably connected to the sealing ring (3). A V-shaped positioning block (11) matching the sealing ring (3) is movably provided on the side of the top of the workbench (1) away from the lever arm (4). The workbench (1) has a ball screw (16) rotatably connected to the cylinder (7) on the top. The outer wall of the ball screw (16) is fitted with a movably connected screw nut (17). The pressure plate (8) is fixedly connected to the outer wall of the screw nut (17). The surface of the V-shaped positioning block (11) has a through groove (18). A rack (19) is provided on one side of the inner wall of the through groove (18). The top of the workbench (1) has a gear (20) meshing with the rack (19) on the inner side of the through groove (18). The ball screw (16) has a first support plate rotatably connected to the bottom of the worktable (1), and the gear (20) has a second support plate rotatably connected to the bottom of the worktable (1). The first support plate is connected to the second support plate via a track. The eccentric clamping block (10) is rotatably connected to the lever arm (4) via a connecting shaft. A torsion spring is provided between the connecting shaft and the eccentric clamping block (10). The inner wall of the lever arm (4) is provided with an active groove (31) that matches the eccentric clamping block (10).

2. The adjustable pneumatic bellows pressure testing equipment according to claim 1, characterized in that: The workbench (1) has an oil storage chamber (21) between the cylinder (7) and the ball screw (16). The top of the inner wall of the oil storage chamber (21) is provided with a movably connected sealing plate (22). The top of the sealing plate (22) is provided with a connecting rod (23). The top of the connecting rod (23) is provided with a connecting plate (24). The pressure plate (8) is fixedly connected to the connecting plate (24). The sealing ring (3) has a first liquid storage chamber (25), a second liquid storage chamber (26), and a third liquid storage chamber (27). The second liquid storage chamber (26) is located between the first liquid storage chamber (25) and the third liquid storage chamber (27). A connecting pipe (28) is provided between the bottom of the oil storage chamber (21) and the first liquid storage chamber (25). A number of first through holes (29) are provided between the first liquid storage chamber (25) and the second liquid storage chamber (26). A number of second through holes (30) are provided between the second liquid storage chamber (26) and the third liquid storage chamber (27).

3. The adjustable pneumatic bellows pressure testing equipment according to claim 1, characterized in that: The outer wall of the sealing sleeve (2) is provided with an inlet ball valve (12) and an exhaust ball valve (13), and the bottom of the workbench (1) is provided with a control switch (14) and a pressure reducing valve (15).

4. The adjustable pneumatic bellows pressure testing equipment according to claim 1, characterized in that: The top of the workbench (1) is provided with a first guide groove that matches the V-shaped positioning block (11). The guide groove is perpendicular to the lever arm (4). The inner wall of the V-shaped positioning block (11) is provided with a second guide groove that matches the gear (20). The second guide groove is connected to the through groove (18). The first guide groove and the second guide groove are parallel to each other.

5. The adjustable pneumatic bellows pressure testing equipment according to claim 1, characterized in that: The workbench (1) is provided with mounting slots that match the first support plate and the second support plate, and the workbench (1) is provided with a mounting cavity that matches the track between the two mounting slots.

6. The adjustable pneumatic bellows pressure testing equipment according to claim 1, characterized in that: The outer wall of the pressure plate (8) is fixedly connected to the connecting plate (24) by the first support bar, and the outer wall of the connecting plate (24) is fixedly connected to the lead screw nut (17) by the second support bar.

7. The adjustable pneumatic bellows pressure testing equipment according to claim 2, characterized in that: The workbench (1) has an assembly groove (32) on the outside of the sealing ring (3) at the top, and a vertical sliding groove (33) is provided inside the oil storage cavity (21). The outer wall of the sealing plate (22) is provided with a slider (34) that matches the sliding groove (33).

8. The adjustable pneumatic bellows pressure testing equipment according to claim 2, characterized in that: The first liquid storage chamber (25) is located outside the third liquid storage chamber (27). The height of the first liquid storage chamber (25) is less than the height of the second liquid storage chamber (26), and the height of the second liquid storage chamber (26) is less than the height of the third liquid storage chamber (27).

9. The adjustable pneumatic bellows pressure testing equipment according to claim 2, characterized in that: The height of the first through hole (29) is greater than the height of the connecting pipe (28), and the height of the second through hole (30) is greater than the height of the first through hole (29).

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