High-sealing vacuum clamp

Abstract

The utility model relates to the technical field of fasteners, in particular to a high-sealing vacuum clamp which comprises a lower clamp and an upper clamp, a sealing mechanism is arranged on the lower clamp and comprises a rotating block, and the outer wall of the rotating block is rotationally connected with a fastening threaded rod; and a piston cavity is formed in the inner wall of the connecting sleeve, and the inner wall of the connecting sleeve is rotationally connected with a rotating nut. Through the arrangement of the sealing mechanism, when the piston plate moves towards the direction of the return spring, air in the piston cavity is extruded and enters the annular expansion air bag through the air transmission pipe, so that the annular expansion air bag tightly abuts against the fastening threaded rod in a sealing mode; the rotating nut in the connecting sleeve and the part in threaded connection with the rotating nut are sealed, so that the problems that the fastening force is reduced due to thread corrosion in a corrosive environment and the sealing performance of the vacuum clamp is invalid are solved, and the sealing stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, and particularly relates to a high-sealing vacuum clamp. Background Art

[0002] A vacuum clamp is a fastening device used to connect and seal vacuum pipelines or equipment, and is widely used in industries such as vacuum systems, semiconductor manufacturing, chemical industry, and pharmaceutical industry. It is usually fastened by bolts, nuts or other mechanical structures to provide a strong pressing force, thereby ensuring the sealing performance in a vacuum environment.

[0003] In a chemical plant, there are often corrosive gases such as chlorine and hydrogen sulfide, as well as liquids such as sulfuric acid and hydrochloric acid. These gases and liquids can quickly corrode exposed metal parts in a relatively humid environment. In a corrosive gas or liquid environment, it is a common failure reason that the threads at the connection part of the bolt and the nut are corroded, resulting in poor fastening. Rusting causes oxides to form on the thread surface. These oxides are fragile and brittle. Over time, the actual contact area of the thread decreases, and finally the bolt cannot maintain an effective fastening force. This causes the sealing performance of the vacuum clamp to decline or even fail.

[0004] In view of this, we propose a high-sealing vacuum clamp. Content of the Utility Model

[0005] The purpose of the utility model is to provide a high-sealing vacuum clamp, which solves the problem that the fastening force decreases due to thread rust in a corrosive environment, and the sealing performance of the vacuum clamp fails accordingly.

[0006] To achieve the above purpose, the utility model provides the following technical solution:

[0007] A high-sealing vacuum clamp includes a lower clamp and an upper clamp. A sealing mechanism is arranged on the lower clamp. The sealing mechanism includes: a rotating block, and the outer wall of the rotating block is rotatably connected with a fastening threaded rod; a connecting sleeve, a piston cavity is formed on the inner wall of the connecting sleeve, a rotating nut is rotatably connected to the inner wall of the connecting sleeve, a chamfered arc-shaped block is fixedly connected to the outer wall of the rotating nut, a right-angle arc-shaped block is fixedly connected to the outer wall of the rotating nut, one end of a return spring is fixedly connected to the inner wall of the piston cavity, the other end of the return spring is fixedly connected to a piston plate, a connecting contact strip is fixedly connected to the outer wall of the piston plate, a transmission air pipe is fixedly connected to the inner wall of the connecting sleeve, and an expansion annular airbag is fixedly connected to the inner wall of the connecting sleeve.

[0008] Preferably, a secondary fastening mechanism is provided on the outer wall of the connecting sleeve. The secondary fastening mechanism includes a fixing ring, the inner wall of the fixing ring is rotatably connected to a rotating ring, the middle part of a connecting spring is fixedly connected to the inner wall of the rotating ring, and fastening nuts are fixedly connected to both sides of the connecting spring.

[0009] Preferably, the outer wall of the lower clamp is hinged to the outer wall of the upper clamp, and the outer wall of the rotating block is rotatably connected to the inner wall of the lower clamp.

[0010] Preferably, the outer wall of the piston plate is in piston connection with the inner wall of the piston cavity, and the outer wall of the connecting contact strip is slidably connected to the inner wall of the connecting sleeve.

[0011] Preferably, one end of the air transmission pipe is communicated with the piston cavity, and the other end of the air transmission pipe is communicated with the inner wall of the expandable annular airbag.

[0012] Preferably, the number of the expandable annular airbags is two, and the two expandable annular airbags are symmetrically installed.

[0013] Preferably, the outer wall of the connecting sleeve is fixedly connected to the outer wall of the fixing ring, and the inner wall of the rotating ring is slidably connected to the outer wall of the fastening nut.

[0014] By means of the above technical solution, the present utility model provides a high-sealing vacuum clamp, which at least has the following beneficial effects:

[0015] (1) By providing a sealing mechanism in the present utility model, when the piston plate moves towards the direction of the return spring, the air in the piston cavity is squeezed at this time and enters the expandable annular airbag through the air transmission pipe, so that the expandable annular airbag tightly contacts and seals the fastening threaded rod, and the rotating nut in the connecting sleeve and the part threadedly connected therewith are sealed, avoiding the problem that the fastening force decreases due to thread corrosion in a corrosive environment and the sealing of the vacuum clamp fails, and improving the sealing stability.

[0016] (2) By providing a sealing mechanism in the present utility model, when the resistance of rotation felt by rotating the fastening threaded rod is greatly reduced, stop rotating the connecting sleeve at this time to avoid the deformation, fracture or damage of the threaded part caused by excessive fastening force, and play the role of optimal fastening, improving the sealing effect.

[0017] (3) By providing a secondary fastening mechanism in the present utility model, rotate the fastening nut to move downward, and the fastening nut applies a downward force to the rotating ring and the fixing ring through the connecting spring, and the fixing ring applies a downward force to the connecting sleeve, playing the role of secondary fastening, further improving the fastening stability of the device and also increasing the sealing of the device to be fastened. Description of the Drawings

[0018] The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of this application:

[0019] Figure 1 is a schematic structural view of the overall structure of the present utility model;

[0020] Figure 2 is a schematic structural view of the sealing mechanism in the present utility model;

[0021] Figure 3 is a schematic sectional structural view of the front view of the connecting sleeve in the present utility model;

[0022] Figure 4 is a schematic sectional structural view of the top view of the rotating nut in the present utility model;

[0023] Figure 5 is a schematic structural view of the secondary fastening mechanism in the present utility model.

[0024] In the figure: 1, lower clamp; 2, upper clamp; 3, sealing mechanism; 31, rotating block; 32, fastening threaded rod; 33, connecting sleeve; 34, piston cavity; 35, rotating nut; 36, chamfered arc-shaped block; 37, right-angled arc-shaped block; 38, return spring; 39, piston plate; 310, connecting contact strip; 311, air transmission pipe; 312, inflated annular airbag; 4, secondary fastening mechanism; 41, fixed ring; 42, rotating ring; 43, connecting spring; 44, fastening nut. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figures 1-5As shown, a technical solution provided by the utility model is: a high-sealing vacuum clamp, comprising a lower clamp 1 and an upper clamp 2, the lower clamp 1 is provided with a sealing mechanism 3, the sealing mechanism 3 comprises: a rotating block 31, the outer wall of the rotating block 31 is rotatably connected with a fastening threaded rod 32; a connecting sleeve 33, the inner wall of the connecting sleeve 33 is provided with a piston cavity 34, the inner wall of the connecting sleeve 33 is rotatably connected with a rotating nut 35, the outer wall of the rotating nut 35 is fixedly connected with a chamfered arc block 36, the outer wall of the rotating nut 35 is fixedly connected with a right-angle arc block 37, one end of a return spring 38 is fixedly connected to the inner wall of the piston cavity 34, the other end of the return spring 38 is fixedly connected with a piston plate 39, the outer wall of the piston plate 39 is fixedly connected with a connecting abutment strip 310, the inner wall of the connecting sleeve 33 is fixedly connected with a transmission air pipe 311, and the inner wall of the connecting sleeve 33 is fixedly connected with an expansion annular airbag 312. The fastening threaded rod 32 is rotated to make the fastening threaded rod 32 rotate into the clamping groove of the upper clamp 2, and then the connecting sleeve 33 is rotated to drive the connecting resistance strip 310 to rotate, and the connecting resistance strip 310 begins to resist the arc surface of the chamfered arc block 36. At this time, the force of the connecting resistance strip 310 resisting the arc surface of the chamfered arc block 36 can drive the chamfered arc block 36 to rotate, and the chamfered arc block 36 drives the rotating nut 35 to rotate, so that the rotating nut 35 moves downward under the action of the fastening threaded rod 32, so that The rotating nut 35 drives the rotating connecting sleeve 33 to move downward, and the rotating connecting sleeve 33 contacts and tightens the upper clamp 2. When the tightening force reaches a certain level, the contact force between the connecting resistance strip 310 and the arc surface of the chamfered arc block 36 increases, so that the connecting resistance strip 310 and the piston plate 39 squeeze the return spring 38, so that the connecting resistance strip 310 moves to the surface of the chamfered arc block 36. At this time, it can be clearly felt that the resistance to rotation is greatly reduced, and the rotating connecting sleeve 33 is stopped at this time.

[0027] The outer wall of the connecting sleeve 33 is provided with a secondary fastening mechanism 4, which includes a fixed ring 41, the inner wall of the fixed ring 41 is rotatably connected with a rotating ring 42, the inner wall of the rotating ring 42 is fixedly connected with the middle part of the connecting spring 43, and the two sides of the connecting spring 43 are fixedly connected with fastening nuts 44. The fastening nut 44 is rotated, and the fastening nut 44 is threadedly connected with the fastening threaded rod 32, and the fastening nut 44 is continuously rotated to move downward, and the fastening nut 44 applies a downward force to the rotating ring 42 and the fixed ring 41 through the connecting spring 43, and the fixed ring 41 applies a downward force to the connecting sleeve 33.

[0028] The outer wall of the lower clamp 1 is hinged with the outer wall of the upper clamp 2, so that the lower clamp 1 and the upper clamp 2 rotate with each other, the outer wall of the rotating block 31 is rotatably connected with the inner wall of the lower clamp 1, so that the rotating block 31 drives the fastening threaded rod 32 to rotate relative to the lower clamp 1, the outer wall of the piston plate 39 is connected with the inner wall piston of the piston cavity 34, so that the inner wall of the piston cavity 34 forms a seal, the outer wall of the connecting and contacting strip 310 is slidably connected with the inner wall of the connecting sleeve 33, so that the connecting and contacting strip 310 can stably reciprocate, one end of the transmission air pipe 311 is connected with the piston cavity 34, and the other end of the transmission air pipe 311 is connected with the inner wall of the expansion annular airbag 312. The air in the piston cavity 34 can enter the expansion annular airbag 312 through the transmission air pipe 311. The number of the expansion annular airbags 312 is two, and the two expansion annular airbags 312 are symmetrically installed. When the two expansion annular airbags 312 expand, they can simultaneously and tightly contact the fastening threaded rod 32.

[0029] The outer wall of the connecting sleeve 33 is fixedly connected to the outer wall of the fixing ring 41 , and the inner wall of the rotating ring 42 is slidably connected to the outer wall of the fastening nut 44 , so that the rotating ring 42 can move up and down relative to the fastening nut 44 .

[0030] When the high-sealing vacuum clamp of the utility model is in use, the fastening threaded rod 32 is rotated to make the fastening threaded rod 32 rotate into the clamping groove of the upper clamp 2, and then the connecting sleeve 33 is rotated to drive the connecting resistance strip 310 to rotate, and the connecting resistance strip 310 begins to resist the arc surface of the chamfered arc block 36. At this time, the force of the connecting resistance strip 310 resisting the arc surface of the chamfered arc block 36 can drive the chamfered arc block 36 to rotate, and the chamfered arc block 36 drives the rotating nut 35 to rotate, so that the rotating nut 35 moves downward under the action of the fastening threaded rod 32, so that the rotating nut 35 drives The connecting sleeve 33 is rotated to move downward, and the connecting sleeve 33 is rotated to resist and tighten the upper clamp 2. When the tightening force reaches a certain level, the resistance between the connecting resistance strip 310 and the arc surface of the chamfered arc block 36 increases, so that the connecting resistance strip 310 and the piston plate 39 squeeze the return spring 38, so that the connecting resistance strip 310 moves to the surface of the chamfered arc block 36. At this time, it can be clearly felt that the resistance to rotation is greatly reduced. At this time, the connecting sleeve 33 is stopped to avoid deformation, breakage or damage of the threaded part caused by excessive tightening force, which plays the role of optimal tightening. The sealing effect is improved.

[0031] When the piston plate 39 moves in the direction of the return spring 38, the air in the piston cavity 34 is squeezed at this time and enters the expansion annular airbag 312 through the air transmission pipe 311, so that the expansion annular airbag 312 tightly abuts and seals the fastening threaded rod 32, making the rotating nut 35 in the connecting sleeve 33 and the part threadedly connected thereto sealed, avoiding the problem that the fastening force decreases due to thread corrosion in the corrosive environment and the sealing performance of the vacuum clamp fails, and improving the sealing stability.

[0032] Then rotate the fastening nut 44. The fastening nut 44 is threadedly connected to the fastening threaded rod 32. Continue to rotate the fastening nut 44 to move downward. The fastening nut 44 applies a downward force to the rotating ring 42 and the fixed ring 41 through the connecting spring 43, and the fixed ring 41 applies a downward force to the connecting sleeve 33, playing a role of secondary fastening, further improving the fastening stability of the device and also increasing the sealing performance of the device to be fastened.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-sealing vacuum clamp, comprising a lower clamp (1) and an upper clamp (2), characterized in that: A sealing mechanism (3) is provided on the lower clamp (1), and the sealing mechanism (3) includes: A rotating block (31), and the outer wall of the rotating block (31) is rotatably connected to a fastening screw rod (32); A connecting sleeve (33), a piston cavity (34) is provided on the inner wall of the connecting sleeve (33), a rotating nut (35) is rotatably connected to the inner wall of the connecting sleeve (33), a chamfered arc-shaped block (36) is fixedly connected to the outer wall of the rotating nut (35), a right-angle arc-shaped block (37) is fixedly connected to the outer wall of the rotating nut (35), one end of a return spring (38) is fixedly connected to the inner wall of the piston cavity (34), the other end of the return spring (38) is fixedly connected to a piston plate (39), a connecting contact strip (310) is fixedly connected to the outer wall of the piston plate (39), a conveying air pipe (311) is fixedly connected to the inner wall of the connecting sleeve (33), and an expanding annular airbag (312) is fixedly connected to the inner wall of the connecting sleeve (33).

2. The high-sealing vacuum clamp according to claim 1, wherein: A secondary fastening mechanism (4) is provided on the outer wall of the connecting sleeve (33), and the secondary fastening mechanism (4) includes a fixing ring (41), a rotating ring (42) is rotatably connected to the inner wall of the fixing ring (41), the middle of a connecting spring (43) is fixedly connected to the inner wall of the rotating ring (42), and fastening nuts (44) are fixedly connected to both sides of the connecting spring (43).

3. A highly-sealed vacuum clamp according to claim 1, characterized in that: The outer wall of the lower clamp (1) is hinged to the outer wall of the upper clamp (2), and the outer wall of the rotating block (31) is rotatably connected to the inner wall of the lower clamp (1).

4. The high-sealing vacuum clamp according to claim 1, wherein: The outer wall of the piston plate (39) is in piston connection with the inner wall of the piston cavity (34), and the outer wall of the connecting contact strip (310) is slidably connected to the inner wall of the connecting sleeve (33).

5. The high-sealing vacuum clamp according to claim 1, characterized in that: One end of the conveying air pipe (311) is communicated with the piston cavity (34), and the other end of the conveying air pipe (311) is communicated with the inner wall of the expanding annular airbag (312).

6. The high-sealing vacuum clamp according to claim 1, characterized in that: The number of the expanding annular airbags (312) is two, and the two expanding annular airbags (312) are symmetrically installed.

7. The high-sealing vacuum clamp according to claim 2, wherein: The outer wall of the connecting sleeve (33) is fixedly connected to the outer wall of the fixing ring (41), and the inner wall of the rotating ring (42) is slidably connected to the outer wall of the fastening nut (44).

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