A pneumatic capillary clamping device

Abstract

The present invention discloses a pneumatic capillary clamping device, including a cylinder, a piston, a cylinder cover, a spring, a clamping seal and a rubber ring. One end of the cylinder is locked with the cylinder cover, and the other end is an air inlet connected to a compressed air source. The air inlet end inside the cylinder is provided with a cylinder connected to the air inlet. The piston is installed in the cylinder. A locking ring is provided on the top of the piston. A tapered hole is designed in the center of the locking ring, which is connected to the piston cavity. The locking ring is connected to the bottom of the cylinder barrel through a spring, and the spring is in a stretched state. One end of the clamping seal is a clamping end, which is telescopically matched with the locking ring, and the other end is a sealing end. A rubber ring is provided between the sealing end and the cylinder cover. The capillary penetrates the cylinder cover, the rubber ring, the clamping seal, and extends into the piston. The present invention realizes two processes: automatically locking the capillary when the air source is connected and automatically releasing the capillary when the gas is disconnected, which frees up labor, shortens the test time, improves the automation of the test, and simplifies the test process.

Description

Technical Field

[0001] The invention belongs to the technical field of flow testing, and relates to a capillary flow testing device, in particular to a pneumatic capillary clamping device. Background Art

[0002] In the prior art, the test process of the capillary flow test equipment is: insert the capillary; install the locking device; connect the test gas; test; disconnect the test gas; remove the locking device; pull out the capillary. Each capillary needs to install and remove the locking device, which is cumbersome and inefficient. Therefore, changing the manual locking to automatic locking will be of great significance to improving the degree of automation and streamlining the test process. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a pneumatic clamping device for a capillary flow test device with a simple structure and efficient operation. The capillary can be automatically locked as long as the gas source is connected, and the capillary can be released when the gas source is disconnected. The test process is optimized as follows: insert the capillary; connect the test gas; test; disconnect the test gas; pull out the capillary. The two most time-consuming and cumbersome manual processes of installing and disassembling the locking device are omitted, which simplifies the test process and shortens the test time, which is of great significance to improving the test efficiency and automation.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A pneumatic capillary clamping device comprises a cylinder, a piston, a cylinder cover, a spring, a clamping seal and a rubber ring.

[0006] The cylinder barrel is a cylindrical structure, one end of which is locked with the cylinder cover, and the other end is an air inlet connected to the compressed air source. The air inlet end inside the cylinder barrel is provided with a cylinder connected to the air inlet, the bottom of the cylinder is an integrated structure with the bottom of the cylinder barrel, and a through hole is provided on the side wall of the cylinder;

[0007] The piston is installed in the cylinder, the outer diameter of the piston is matched with the inner diameter of the cylinder, a through hole is provided on the side wall of the piston, a locking ring is provided on the top of the piston, and the locking ring and the piston are an integrated structure;

[0008] The locking ring is designed with a tapered hole at its center, which is connected to the piston cavity. The tapered hole of the locking ring matches the clamping seal, and the outer diameter of the locking ring matches the clearance of the inner wall of the cylinder barrel. The locking ring is connected to the bottom of the cylinder barrel through a spring, and the spring is in a stretched state.

[0009] One end of the clamping seal is a clamping end, which is telescopically matched with a locking ring, and the other end is a sealing end. A rubber ring is arranged between the sealing end and the cylinder cover. The capillary tube runs through the cylinder cover, the rubber ring, the clamping seal, and extends into the piston.

[0010] Furthermore, the clamping end of the clamping seal is composed of at least two clamping plates, each of which has a gap, and the clamping plates have a certain resilience; the outer peripheral surface of the clamping end is conical, and the taper of the cone matches the tapered hole of the locking ring; the piston drives the locking ring to move telescopically to narrow and enlarge the gap between the clamping plates at the clamping end of the clamping seal; the narrowing of the gap between the clamping plates can lock the capillary, and the enlargement of the gap can release the capillary.

[0011] Furthermore, the sealing end of the clamping seal is designed as an integral unit with the clamping end, and the sealing end provides bottom support for the rebound of the clamping piece; one end of the clamping seal that cooperates with the rubber ring has an inward taper, and the inward taper is squeezed and matched with the rubber ring to seal the cylinder and lock the capillary.

[0012] Furthermore, the main structure of the sealing end is a cylinder, a through hole with a diameter larger than the outer diameter of the capillary is designed at the center of the cylinder, and the outer diameter of the cylinder is clearance-matched with the inner diameter of the cylinder.

[0013] Furthermore, the outer diameter of the rubber ring is matched and installed in the cylinder with a gap, and a through hole with a hole diameter larger than the outer diameter of the capillary is arranged in the center.

[0014] Furthermore, the cylinder is tubular, and at least one through hole is arranged on the side wall of the cylinder; the piston is a hollow structure, and at least one through hole is arranged on the side wall of the piston.

[0015] Furthermore, the cylinder cover is threadably connected to the cylinder barrel, and a through hole having a diameter larger than the outer diameter of the capillary tube is provided at the center of the cylinder cover.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention changes the power source of the capillary clamping device from manual to pneumatic, providing a pneumatic clamping device for capillary flow testing equipment that has a simple structure, is easy to process, and has efficient operation. The device realizes two processes: automatically locking the capillary when the gas source is connected, and automatically releasing the capillary when the gas is disconnected, thereby freeing up labor, shortening test time, improving the degree of test automation, and streamlining the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 Axle side schematic diagram;

[0020] Figure 3 It is a structural schematic diagram of the piston and the locking ring;

[0021] Figure 4 A schematic diagram of an axial side of a clamping end of a clamping seal;

[0022] Figure 5 A schematic diagram of the shaft side of the sealing end of a clamp seal.

[0023] Among them, 1. air inlet; 2. cylinder; 3. spring; 4. piston; 5. locking ring; 6. clamping seal; 7. cylinder barrel; 8. rubber ring; 9. cylinder head; 10. capillary; 11. clamping plate. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 1-2 As shown, a pneumatic capillary clamping device includes a cylinder 7, a piston 4, a cylinder cover 9, a spring 3, a clamping seal 6 and a rubber ring 8.

[0026] The cylinder barrel 7 is a cylindrical structure, with an external thread at one end that is locked with the internal thread of the cylinder cover 9; the other end is an air inlet 1 connected to a compressed air source. The air inlet end inside the cylinder barrel 7 is provided with a cylinder 2 connected to the air inlet 1, the cylinder 2 is tubular, the bottom of the cylinder 2 is an integral structure with the bottom of the cylinder barrel 7, and at least one through hole is provided on the side wall of the cylinder 2.

[0027] The piston 4 is installed in the cylinder 2. The outer diameter of the piston 4 is matched with the inner diameter of the cylinder 2. At least one through hole is set on the side wall of the piston 4. The piston 4 is a hollow structure. A locking ring 5 is set on the top of the piston 4. The locking ring 5 and the piston 4 are an integral structure. Figure 3 shown.

[0028] The center of the locking ring 5 is designed with a tapered hole, which is connected to the cavity of the piston 4. The tapered hole of the locking ring 5 cooperates with the clamping seal 6, and the outer diameter of the locking ring 5 cooperates with the inner wall clearance of the cylinder 7. The locking ring 5 plays a limiting role when the piston 4 cooperates with the cylinder 2. The locking ring 5 is connected to the bottom of the cylinder 7 through the spring 3, and the spring 3 is in a stretched state. The function of the spring 3 is to pull the piston 4 back to the limit position after the test gas is disconnected.

[0029] Combination Figure 1 , 2 , 4, 5, one end of the clamping seal 6 is the clamping end, which is telescopically matched with the locking ring 5, and the other end is the sealing end. A rubber ring 8 is arranged between the sealing end and the cylinder cover 9. The outer diameter of the rubber ring 8 is matched with a gap and installed in the cylinder barrel 7. A through hole with a diameter larger than the outer diameter of the capillary 10 is arranged in the center.

[0030] The clamping end of the clamping seal 6 is composed of at least two clamping plates 11, each of which has a gap, and the clamping plates 11 have a certain resilience; the outer peripheral surface of the clamping end is conical, and the taper of the cone matches the tapered hole of the locking ring 5; the piston 4 drives the locking ring 5 to move telescopically to narrow and enlarge the gap between the clamping plates at the clamping end of the clamping seal 6; the capillary 10 can be locked when the gap between the clamping plates is narrowed, and the capillary 10 can be released when the gap is enlarged.

[0031] The sealing end of the clamping seal 6 is designed as an integral part with the clamping end, and the sealing end provides bottom support for the rebound of the clamping piece. The main structure of the sealing end is a cylinder, and a through hole with a diameter larger than the outer diameter of the capillary 10 is designed in the center of the cylinder, and the outer diameter of the cylinder is matched with the inner diameter clearance of the cylinder 7. The end of the clamping seal 6 that matches the rubber ring 8 has a concave taper, and the concave taper is squeezed and matched with the rubber ring 8 to seal the cylinder 7 and lock the capillary 10. The concave taper has two functions: one is that the concave taper is squeezed and matched with the rubber ring 8 to seal the cylinder 7 and further lock the capillary 10; the other is that it has a guiding effect on the capillary 10.

[0032] like Figure 1-2 The center of the cylinder cover 9 is provided with a through hole whose aperture is larger than the outer diameter of the capillary 10, and the insertion end of the capillary 10 is provided with a tapered hole to guide the capillary 10 and facilitate the insertion of the capillary 10. When in use, the capillary 10 passes through the cylinder cover 9, the rubber ring 8, the clamping seal 6, and extends into the piston 4.

[0033] The working process is as follows: insert the capillary 10 from the center hole of the cylinder cover 9, connect the gas source, and the compressed gas enters from the gas inlet 1. The gas pushes the piston 4 to move forward. The locking ring 5 of the piston 4 cooperates with the clamping seal 6. The locking ring 5 moves along the clamping end of the clamping seal 6. The gap between the clamping pieces 11 is reduced, and the capillary 10 is locked. The piston 4 drives the clamping seal 6 to continue to move forward. The sealing end of the clamping seal 6 squeezes the rubber ring 8. The rubber ring 8 squeezes the capillary 10 and the cylinder cover 9, producing a sealing effect on the entire cylinder 7 and further locking the capillary 10. Until the bottom surface of the piston 4 moves to the through hole of the side wall of the cylinder 2, the compressed gas enters the cylinder 7 from the through hole of the cylinder 2, and the cylinder gas is connected to the piston cavity through the through hole of the side wall of the piston 4, and is also connected to the capillary 10. At this time, the capillary 10 is in a locked and sealed state and is connected to the gas source; the spring 3 is in a stretched state.

[0034] When the gas is disconnected, the piston 4 returns to the initial position of the limit under the pulling force of the spring 3, the locking ring 5 separates from the clamping seal 6, the clamping pieces rebound, the gap between the clamping pieces expands, and the capillary 10 is released. The rubber ring 8 rebounds to release the capillary 10, and the capillary 10 can be pulled out.

[0035] In summary, the present invention realizes two processes of automatically locking the capillary when the gas source is connected and automatically releasing the capillary when the gas is disconnected, thereby freeing up manpower, shortening the test time, simplifying the test process, and improving the test efficiency.

[0036] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A pneumatic capillary clamping device, Features: It includes a cylinder barrel, a piston, a cylinder head, a spring, a clamping seal and a rubber ring. The cylinder barrel is a cylindrical structure, one end of which is locked with the cylinder head, and the other end is an air inlet connected to a compressed air source. The air inlet end inside the cylinder barrel is provided with a cylinder connected to the air inlet. The bottom of the cylinder and the bottom of the cylinder barrel are an integrated structure, and a through hole is provided on the side wall of the cylinder. The piston is installed in the cylinder, the outer diameter of the piston is matched with the inner diameter of the cylinder, the side wall of the piston is provided with a through hole, and a locking ring is provided on the top of the piston. The locking ring and the piston are an integrated structure. The locking ring is designed with a tapered hole at its center, which is connected to the piston cavity. The tapered hole of the locking ring matches with the clamping seal, and the outer diameter of the locking ring matches with the clearance of the inner wall of the cylinder. The locking ring is connected to the bottom of the cylinder through a spring, and the spring is in a stretched state. One end of the clamping seal is a clamping end, which is telescopically matched with the locking ring, and the other end is a sealing end. A rubber ring is arranged between the sealing end and the cylinder cover, and the capillary runs through the cylinder cover, the rubber ring, the clamping seal, and extends into the piston. The clamping end of the clamping seal is composed of at least two clamping sheets, each of which has a gap, and the clamping sheets have a certain resilience; the outer peripheral surface of the clamping end is conical, and the taper of the cone matches the tapered hole of the locking ring; the piston drives the locking ring to move telescopically to narrow and enlarge the gap between the clamping sheets at the clamping end of the clamping seal; the narrowing of the gap between the clamping sheets can lock the capillary, and the enlargement of the gap can release the capillary; The working process is as follows: insert the capillary from the center hole of the cylinder cover, connect the air source, and the compressed gas enters from the air inlet. The gas pushes the piston to move forward. The locking ring of the piston cooperates with the clamping seal. The locking ring moves along the guide of the clamping end of the clamping seal. The gap between the clamping pieces is reduced, and the capillary is locked. The piston drives the clamping seal to continue to move forward. The sealing end of the clamping seal squeezes the rubber ring, and the rubber ring squeezes the capillary and the cylinder cover, producing a sealing effect on the entire cylinder and further locking the capillary until the bottom surface of the piston moves to the through hole on the side wall of the cylinder. The compressed gas enters the cylinder from the cylinder through hole. The cylinder gas is connected to the inner cavity of the piston through the through hole on the side wall of the piston, and is also connected to the capillary. At this time, the capillary is in a locked and sealed state and is connected to the air source, and the spring is in a stretched state. When the gas is disconnected, the piston returns to the initial limit position under the tension of the spring, the locking ring separates from the clamping seal, the clamping pieces rebound, the gap between the clamping pieces expands, the capillary is released, the rubber ring rebounds to release the capillary, and the capillary can be pulled out.

2. A pneumatic capillary clamping device according to claim 1, Features: The sealing end of the clamping seal is designed as an integral whole with the clamping end, and the sealing end provides bottom support for the rebound of the clamping piece; one end of the clamping seal that cooperates with the rubber ring has an inward taper, and the inward taper is squeezed and matched with the rubber ring to seal the cylinder and lock the capillary.

3. A pneumatic capillary clamping device according to claim 2, Features: The main structure of the sealing end is a cylinder, a through hole with a diameter larger than the outer diameter of the capillary is designed at the center of the cylinder, and the outer diameter of the cylinder is in clearance with the inner diameter of the cylinder.

4. A pneumatic capillary clamping device according to claim 3, Features: The outer diameter of the rubber ring is matched and installed in the cylinder with a gap, and a through hole with a hole diameter larger than the outer diameter of the capillary is arranged at the center.

5. A pneumatic capillary clamping device according to claim 4, Features: The cylinder is tubular, and at least one through hole is arranged on the side wall of the cylinder; the piston is a hollow structure, and at least one through hole is arranged on the side wall of the piston.

6. A pneumatic capillary clamping device according to claim 1, Features: The cylinder cover is threadably connected to the cylinder barrel, and a through hole with a diameter larger than the outer diameter of the capillary is provided at the center of the cylinder cover.

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