Positioning and clamping device for liquid nitrogen cooling of sealing plug and using method of positioning and clamping device

Abstract

The invention discloses a positioning and clamping device for liquid nitrogen cooling of a sealing plug and a using method thereof, and belongs to the technical field of part assembly. The inner wall of the outer shell is connected with a limiting plate, a push rod is arranged in the limiting plate in a sliding mode, the push rod is sleeved with a reset compression spring, the upper end of the push rod is connected with a pressing cap, the lower end of the push rod is connected with a push ball, clamping plates are arranged on the two sides of the push ball, and the opposite faces of the upper ends of the two clamping plates are wedge-shaped faces inclining from outside to inside. The upper ends of the two clamping plates are arranged in the outer shell through elastic assemblies. And the lower ends of the two clamping plates extend out of the outer side of the outer shell. The upper end of the reset compression spring abuts against the inner top face of the pressing cap, and the lower end abuts against the limiting plate. According to the invention, uniform contact of a cooling medium is ensured, subsequent accurate clamping is facilitated, the normal-temperature exposure time is shortened, size mismatch caused by thermal expansion and cold contraction is avoided, the interference fit assembly qualification rate and the reliability of a sealing structure are remarkably improved, and the whole-process technical optimization of cooling positioning, stable clamping and accurate assembly is realized in the whole operation process.

Description

Technical Field

[0001] The invention relates to a positioning and clamping device for liquid nitrogen cooling of a sealing plug and a use method thereof, belonging to the technical field of parts assembly. Background Art

[0002] In the field of industrial assembly, low-temperature cooling of sealing plugs of different specifications is a common technical solution for achieving interference fit assembly. However, the existing technical solution has the following technical drawbacks: 1. Cooling process control defects: During liquid nitrogen cooling operations, the sealing plug lacks effective spatial constraints within the cooling vessel, often randomly dumping at the bottom of the vessel. This results in uneven contact with the cooling medium and significantly increases the difficulty of clamping operations. 2. Insufficient clamping reliability: When using traditional manual gripping tools (such as tweezers) for pick-and-place operations, the cylindrical sealing plug is prone to slippage in low-temperature environments due to the poor match between the geometric features of the cylindrical sealing plug and the contact surface of the gripping tool, seriously affecting work continuity and operational safety. 3. Lack of assembly accuracy assurance: During the assembly stage, existing technologies are unable to achieve precise colinear positioning of the sealing plug axis and the product mounting hole axis, resulting in the plug being exposed to the normal temperature environment for a time exceeding the process-allowed window period, causing dimensional mismatch due to the thermal expansion and contraction effects of the material, and ultimately causing interference fit failure, significantly reducing the assembly qualification rate and the reliability of the sealing structure. Summary of the Invention

[0003] In order to solve the problems existing in the background technology, the present invention provides a positioning and clamping device for liquid nitrogen cooling of a sealing plug and a method for using the same.

[0004] The cam is secured to the outer wall of the housing and is adapted to engage the locking cam of the locking cam, the locking cam of the locking cam being secured to the locking cam and the locking cam of the locking cam.

[0005] Furthermore, the outer wall of the push cap is connected to the inner wall of the outer shell in a sliding and limiting manner.

[0006] Furthermore, the two splints are respectively an L-shaped V-mouth splint and an L-shaped flat splint.

[0007] Furthermore, a notch is provided on the side wall at the lower end of the outer shell, and the notch is detachably fixedly connected to the cover plate.

[0008] Furthermore, the elastic component includes a pin rod and a clamping compression spring; a plurality of horizontally arranged pin rods are slidably inserted on the lower end of the outer shell and the cover plate, the inner end of each pin rod is respectively inserted into the corresponding clamp plate, and the outer side of the inner end of each pin rod is provided with a clamping compression spring, the inner end of the clamping compression spring rests on the corresponding clamp plate, and the outer end of the clamping compression spring rests on the inner wall of the outer shell or the cover plate.

[0009] Furthermore, the positioning unit includes a cooling plate, a positioning shaft cylinder, and an extraction shaft; a plurality of placement holes are provided on the upper surface of the cooling plate, and the middle part of the upper surface of the cooling plate is detachably fixedly connected to the positioning shaft cylinder, and the positioning shaft cylinder is detachably fixedly connected to the lower end of the vertically arranged extraction shaft.

[0010] Furthermore, the outer interference sleeve of the positioning shaft cylinder is provided with a plug positioning disk, and the upper surface of the plug positioning disk is provided with a plurality of placement holes 2, and the placement holes 2 are arranged in a one-to-one correspondence with the placement holes.

[0011] A method for using a positioning and clamping device for liquid nitrogen cooling of a sealing plug according to the present invention comprises the following steps: S1: Place the plug products in the corresponding placement hole 1 and placement hole 2 in sequence; S2: placing the positioning unit in a liquid nitrogen box for cooling for a predetermined time; S3: After cooling to a predetermined time, fix the outer shell and press the cap downward; S4: The push cap pushes the push rod downward, and the return spring is compressed; S5: The push rod drives the push ball to move downward. The push ball pushes the two splints apart from each other under the action of the wedge surface, and the clamping spring is compressed; S6: Align the space between the two splints with the corresponding plug product so that the plug product is located in the V-mouth of the V-mouth splint; S7: The force applied by the button cap is canceled, and the push ball moves upwards through the button cap under the action of the reset force of the reset spring; S8: The two clamping plates move closer to each other under the action of the clamping spring, thereby effectively clamping the plug product.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a combined structure of a cooling plate with array positioning holes and a plug positioning plate to achieve regular vertical positioning of the sealing plug during liquid nitrogen cooling, ensuring uniform contact with the cooling medium and facilitating subsequent precise clamping; 2. The present invention uses a ball-driven wedge-shaped clamping plate opening and closing mechanism with a V-shaped clamping jaw and a flat clamping jaw composite design to improve the clamping stability of the cylindrical plug in low-temperature environments and effectively prevent the risk of slipping. 3. The guiding structure composed of the positioning shaft cylinder and the extraction shaft of the present invention ensures that the axis of the plug always maintains a collinear relationship with the axis of the mounting hole, shortens the exposure time at room temperature, avoids dimensional mismatch caused by thermal expansion and contraction, and significantly improves the qualified rate of interference fit assembly and the reliability of the sealing structure. The entire operation process realizes full-process technical optimization of cooling positioning, stable clamping, and precise assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 A perspective view of the internal structure; Figure 3 yes Figure 1 A top view of Figure 4 yes Figure 3 AA section view; Figure 5 yes Figure 1 Side view of; Figure 6 yes Figure 5 JJ sectional view; Figure 7 Schematic diagram of the connection between the elastic component and the splint; Figure 8 yes Figure 7 sectional view of Figure 9 It is a structural diagram of the positioning unit; Figure 10 yes Figure 9 A top view of Figure 11 yes Figure 9 sectional view of . DETAILED DESCRIPTION

[0014] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] The cam 12 is pressed against the top of the cam 13 and the cam 14 is pressed against the top of the cam 13 so that the cam 14 can slide in the cam 16. The cam 12 is pressed against the top of the cam 13 and the cam 14 can slide in the cam 16. The upper ends of the two clamps are arranged in the outer shell 1 through elastic components; the lower ends of the two clamps extend to the outside of the outer shell 1. A protective rubber sleeve 15 is installed on the outer wall of the outer shell 1.

[0016] Furthermore, the outer wall of the push cap 3 is connected to the inner wall of the outer shell 1 in a sliding and limiting manner, thereby improving the stability of the movement of the push rod 4.

[0017] Furthermore, the two clamps are an L-shaped V-mouth clamp 6 and an L-shaped flat clamp 7. The V-mouth design improves the stability of clamping and is suitable for clamping plug products 9 of different sizes.

[0018] Furthermore, a notch is provided on the side wall at the lower end of the outer shell 1, and the notch is detachably fixedly connected to the cover plate 5 by positioning pins and bolts. The design of the cover plate 5 facilitates the installation of the V-shaped splint 6 and the flat splint 7. After the flat splint 7 is installed on the cover plate 5, the cover plate 5 is fixed to the outer shell 1 by positioning pins and bolts.

[0019] Furthermore, the elastic component includes a pin rod 11 and a clamping compression spring 13; a plurality of horizontally arranged pin rods 11 are slidably inserted on the lower end of the outer shell 1 and the cover plate 5, and the inner end of each pin rod 11 is respectively inserted into the corresponding clamping plate, and the outer side of the inner end of each pin rod 11 is provided with a clamping compression spring 13, and the inner end of the clamping compression spring 13 rests on the corresponding clamping plate, and the outer end of the clamping compression spring 13 rests on the inner wall of the outer shell 1 or the cover plate 5.

[0020] Furthermore, the positioning unit includes a cooling plate 16, a positioning shaft cylinder 18, and an extraction shaft 21; the cooling plate 16 is used to place the plug product 9 to be cooled in the forward direction to ensure that the plug product 9 is cooled in the vertical direction, which is convenient for the subsequent positioning and clamping of the V-neck clamp 6 and the flat clamp 7. The upper surface of the cooling plate 16 is provided with a plurality of placement holes 1 arranged in an array, and the middle part of the upper surface of the cooling plate 16 is coaxially detachably fixedly connected to the positioning shaft cylinder 18 with an n-shaped cross-section by a slotted semi-countsunk screw 20. The positioning shaft cylinder 18 is detachably fixedly connected to the lower end of the vertically arranged extraction shaft 21. The outer wall of the extraction shaft 21 is installed with a protective rubber sleeve 21.

[0021] Furthermore, the outer interference fit of the positioning shaft cylinder 18 is provided with a plug positioning disk 17, and the upper surface of the plug positioning disk 17 is provided with a plurality of placement holes 2 arranged in an array and penetrating its thickness. The placement holes 2 are arranged in a one-to-one correspondence with the placement holes. The plug positioning disk 17 can adapt to the use requirements of plug products 9 of different heights, while avoiding the problem of excessive mass caused by the thickness of the cooling disk 16.

[0022] A method for using a positioning and clamping device for liquid nitrogen cooling of a sealing plug according to the present invention comprises the following steps: S1: Place the plug product 9 in the corresponding placement hole 1 and placement hole 2 in sequence; S2: placing the positioning unit in a liquid nitrogen box for cooling for a predetermined time; S3: After cooling to a predetermined time, the outer shell 1 is fixed while pressing the cap 3 to move downward; S4: The push cap 3 pushes the push rod 4 downward, and the return spring 12 is compressed; S5: The push rod 4 drives the push ball 8 to move downward. The push ball 8 pushes the two clamps apart from each other under the action of the wedge surface, and the clamping spring 13 is compressed; S6: Align the space between the two splints with the corresponding plugging product 9 so that the plugging product 9 is located in the V-mouth of the V-mouth splint 6; S7: The force applied by the push cap 3 is canceled, and the push ball 8 is driven upward by the push cap 3 under the action of the reset force of the reset compression spring 12; S8: The two clamping plates move closer to each other under the action of the clamping compression spring 13, thereby effectively clamping the plug product 9.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0024] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A positioning and clamping device for liquid nitrogen cooling of a sealing plug, characterized by: The invention comprises a clamping unit and a positioning unit for use together, wherein the clamping unit comprises an outer shell (1), a limit plate (2), a pressing cap (3), a push rod (4), a return pressure spring (12), a push ball (8) and a clamping plate; the inner wall of the outer shell (1) is fixedly connected to the horizontally arranged limit plate (2); a vertically arranged push rod (4) slides inside the limit plate (2); a return pressure spring (12) is sleeved on the outer side of the upper end of the push rod (4); and the upper end of the push rod (4) is fixedly connected to the pressing cap (3); the return pressure spring (12) is sleeved on the outer side of the push rod (4); and the upper end of the push rod (4) is fixedly connected to the pressing cap (3); The upper end of the positioning compression spring (12) abuts against the inner top surface of the push cap (3), and the lower end of the reset compression spring (12) abuts against the limit plate (2); the lower end of the push rod (4) is detachably fixedly connected to the push ball (8), and clamps are provided on both sides of the push ball (8), and the opposing surfaces of the upper ends of the two clamps are wedge-shaped surfaces inclined from outside to inside, and the wedge-shaped surfaces are arranged in cooperation with the push ball (8), and the upper ends of the two clamps are arranged in the outer shell (1) through elastic components; the lower ends of the two clamps extend to the outside of the outer shell (1).

2. A positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 1, characterized in that: The outer wall of the push cap (3) is connected to the inner wall of the outer shell (1) in a sliding and limiting manner.

3. The positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 1, characterized in that: The two splints are respectively an L-shaped V-shaped splint (6) and an L-shaped flat splint (7).

4. A positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 2 or 3, characterized in that: A notch is provided on the side wall at the lower end of the outer shell (1), and the notch is detachably fixedly connected to the cover plate (5).

5. The positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 4, characterized in that: The elastic component includes a pin rod (11) and a clamping compression spring (13); a plurality of horizontally arranged pin rods (11) are slidably plugged into the lower end of the outer shell (1) and the cover plate (5), the inner end of each pin rod (11) is plugged into the corresponding clamp plate, and the outer side of the inner end of each pin rod (11) is covered with a clamping compression spring (13), the inner end of the clamping compression spring (13) rests on the corresponding clamp plate, and the outer end of the clamping compression spring (13) rests on the inner wall of the outer shell (1) or the cover plate (5).

6. The positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 1, characterized in that: The positioning unit comprises a cooling plate (16), a positioning shaft cylinder (18), and an extraction shaft (21); a plurality of placement holes are provided on the upper surface of the cooling plate (16), and the middle portion of the upper surface of the cooling plate (16) is detachably fixedly connected to the positioning shaft cylinder (18), and the positioning shaft cylinder (18) is detachably fixedly connected to the lower end of the vertically arranged extraction shaft (21).

7. A positioning and clamping device for liquid nitrogen cooling of a sealing plug according to claim 6, characterized in that: The outer interference sleeve of the positioning shaft cylinder (18) is provided with a plug positioning disk (17), and the upper surface of the plug positioning disk (17) is provided with a plurality of second placement holes, and the second placement holes are arranged in a one-to-one correspondence with the placement holes.

8. A method for using the positioning and clamping device for liquid nitrogen cooling of a sealing plug according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1: Place the plug product (9) in the corresponding placement hole 1 and placement hole 2 in sequence; S2: placing the positioning unit in a liquid nitrogen box for cooling for a predetermined time; S3: After cooling to a predetermined time, the outer shell (1) is fixed while pressing the pressing cap (3) to move downward; S4: The push cap (3) pushes the push rod (4) downward, and the return spring (12) is compressed; S5: The push rod (4) drives the push ball (8) to move downward, and the push ball (8) pushes the two clamping plates apart from each other under the action of the wedge surface, and the clamping spring (13) is compressed; S6: Align the space between the two splints with the corresponding plugging product (9), so that the plugging product (9) is located in the V-mouth of the V-mouth splint (6); S7: The applied force of the push cap (3) is canceled, and the push ball (8) is driven to move upwards by the push cap (3) under the action of the reset force of the reset compression spring (12); S8: The two clamps move closer to each other under the action of the clamping compression spring (13), thereby effectively clamping the plug product (9).

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