Self-expansion clamp

Abstract

The self-expansion clamp comprises a clamp body, the clamp body comprises a first semi-arc-shaped C-shaped clamp and a second semi-arc-shaped C-shaped clamp, one end of the first C-shaped clamp and one end of the second C-shaped clamp are each provided with an extension part, and the other end of the first C-shaped clamp and the other end of the second C-shaped clamp are connected through a C-shaped elastic piece so that a retractable opening can be formed in the end, provided with the extension parts, of the first C-shaped clamp and the second C-shaped clamp; the extension part of the first C-shaped clamp is hinged with a locking handle with a hanging groove; a tension spring assembly is further included, the tension spring assembly comprises two cylindrical springs which are parallel to each other and arranged in a spaced mode, one ends of the two cylindrical springs are provided with hanging lugs hinged to the outer side of the extension portion of the second C-shaped clamp respectively, and the other ends of the two cylindrical springs are provided with pull rods which extend in the axial direction of the cylindrical springs and are located on the two sides of the locking handle. The tail ends of the two pull rods are connected through a cross rod, and the cross rod is matched with the hanging groove. The connector has the advantages of being more convenient to install and lock and good in connector size adaptability.

Description

Technical Field

[0001] The invention relates to the field of pipeline connectors, and in particular to a self-expanding clamp. Background Art

[0002] A clamp (pipe clamp) is a connection device used to connect pipes, valves and pipeline accessories, and is used to tighten the connection between adjacent joints.

[0003] At present, the connection methods of clamps (pipe clamps) include bolt fastening type and buckle type, etc., and the clamps are generally double-piece, and the general double-piece clamps are often cast from zinc alloy or aluminum alloy. Although they can effectively ensure the overall strength, they greatly increase the production cost and their own weight. At the same time, since the clamps cast from zinc alloy or aluminum alloy have strong overall rigidity, they lack elastic deformation margin, and are easy to produce point contact with the joints of adjacent joints during tightening. The axial force consistency at various positions in the circumferential direction of the joint is poor, resulting in local stress concentration and deformation of the joint.

[0004] Therefore, in response to this problem, the applicant applied for a quick-release clamp on January 5, 2024, and was authorized on January 7, 2025, disclosing a first and second semi-arc C-shaped clamp, one end of the first C-shaped clamp is hinged with one end of the second C-shaped clamp, the end of the first C-shaped clamp away from the hinged end is provided with a first extension, and the end of the second C-shaped clamp away from the hinged end is provided with a second extension, the virtual plane of the first C-shaped clamp and the second C-shaped clamp is parallel to the first extension and the second extension and is located between the two; the first C-shaped clamp and the first extension facing the virtual plane of the buckling are provided with a buckling groove, the cross section of the buckling groove is trapezoidal and one side of the long side is close to the virtual plane of the buckling; the first C-shaped clamp and the first extension are integrally stamped by metal plates, and the second C-shaped clamp and the second extension are integrally stamped by metal plates. It has the advantages of simple structure, light weight and low production cost.

[0005] However, in subsequent market feedback, since the first and second C-shaped clamps are hingedly connected, they need to be manually separated in a relaxed state. In some situations where the installation space is limited and it is not conducive to two-handed operation, one-handed installation and disassembly becomes more difficult. At the same time, the locking method is more cumbersome and time-consuming. Summary of the invention

[0006] Based on the above problems, the object of the present invention is to provide a self-expanding clamp which has a simple structure, light weight, low production cost, more convenient installation and locking, and good adaptability to joint sizes.

[0007] In view of the above problems, the following technical solutions are provided: A self-expanding clamp, including a clamping body, the clamping body includes a semi-circular first C-shaped clamp and a second C-shaped clamp. One end of each of the first C-shaped clamp and the second C-shaped clamp is provided with an extension part, and the other ends of the two are connected by a C-shaped elastic sheet so that the end with the extension part forms an openable and closable opening; A locking handle with a hanging groove is hinged to the extension part of the first C-shaped clamp; It also includes a tension spring assembly, the tension spring assembly includes two cylindrical springs arranged parallel to each other and spaced apart from each other. One end of the two cylindrical springs is provided with hanging ears respectively hinged to the outside of the extension part of the second C-shaped clamp. The other ends of the two cylindrical springs are provided with pull rods extending in the axial direction of the cylindrical springs and located on both sides of the locking handle. The ends of the two pull rods are connected by a cross bar, and the cross bar is adapted to the hanging groove; When the locking handle swings along the hinge point and approaches the outer wall of the first C-shaped clamp, the hanging groove pulls the cross bar to stretch and store energy in the cylindrical spring while shrinking the opening and making the locking handle cross the dead point position to lock the first C-shaped clamp and the second C-shaped clamp.

[0008] The present invention is further configured such that after the locking handle crosses the dead point position, the two cylindrical springs are located within the opening between the two extension parts.

[0009] The present invention is further configured such that the winding directions of the two cylindrical springs are opposite to each other.

[0010] The present invention is further configured such that the hanging ears and the pull rods are both located on the side where the two cylindrical springs are away from each other.

[0011] The present invention is further configured such that the locking handle includes a handle body and hinge walls located on both sides of the handle body. The extension part of the first C-shaped clamp is located between the two hinge walls; The hanging groove is opened on the handle body.

[0012] The present invention is further configured such that the handle body and the hinge walls are integrally connected and formed by stamping and bending a metal plate.

[0013] The present invention is further configured such that the surfaces of the first C-shaped clamp and its extension part, and the second C-shaped clamp and its extension part facing each other are provided with tightening grooves, and the groove walls of the tightening grooves are arranged at an angle to form a V shape.

[0014] The present invention is further configured such that the first C-shaped clamp and its extension part, the second C-shaped clamp and its extension part, and the C-shaped elastic sheet are integrally connected and formed by stamping and bending a metal plate.

[0015] The present invention is further configured such that the outer wall of the C-shaped elastic sheet is provided with a concave reinforcing groove formed by stamping, and at the same time, the reinforcing groove forms a convex reinforcing rib on the inner wall of the C-shaped elastic sheet.

[0016] The present invention is further configured such that the two cylindrical springs and their hanging ears, pull rods, and cross bar are integrally formed by bending and curling a spring wire.

[0017] Advantages of the present invention: 1. The first C-shaped clamp and the second C-shaped clamp are connected by a C-shaped elastic piece. In the unloaded state, the elastic force of the C-shaped elastic piece makes the opening in an open state, prompting a space for accommodating the joint to be formed between the first C-shaped clamp and the second C-shaped clamp; 2. When unlocking, just turn the locking handle upwards in the reverse direction to make it cross the dead point position. At the same time, the first C-shaped clamp and the second C-shaped clamp move away from each other under the elastic force of the C-shaped elastic piece, making the opening open. It is applicable to narrow spaces and is also convenient for single-handed operation; 3. At the same time, the cylindrical spring has the advantages of good elastic linearity and large elongation. When the opening degrees of the first C-shaped clamp and the second C-shaped clamp are inconsistent after clamping due to joints of different sizes, dynamic compensation can be carried out through its own stretching and energy storage; 4. While ensuring the overall strength, it has the advantages of light weight and convenient processing. Description of the drawings

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the first perspective of the tightened state of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the second perspective of the tightened state of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the open state of the present invention.

[0021] Figure 4 For the present invention Figure 1 It is a schematic diagram of the fully-sectioned three-dimensional structure.

[0022] Meanings of the reference numerals in the figures: 10 - clamp body; 11 - first C-shaped clamp; 12 - second C-shaped clamp; 13 - extension part; 14 - C-shaped elastic piece; 141 - strengthening groove; 142 - strengthening rib; 15 - opening; 16 - tightening groove; 20 - locking handle; 21 - hanging groove; 22 - handle body; 23 - hinged wall; 30 - tension spring assembly; 31 - cylindrical spring; 32 - hanging ear; 33 - pull rod; 34 - cross bar. Detailed implementation manners

[0023] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0024] Refer to Figures 1 to 4 As Figures 1 to 4A self-expanding clamp shown, comprising a clamping body 10, the clamping body 10 includes a semi-circular first C-shaped clamp 11 and a second C-shaped clamp 12, one end of each of the first C-shaped clamp 11 and the second C-shaped clamp 12 is provided with an extension portion 13, and the other ends of both are connected by a C-shaped elastic sheet 14 so that the end provided with the extension portion 13 forms an openable and closable opening 15; the extension portion 13 of the first C-shaped clamp 11 is hinged with a locking handle 20 with a hanging groove 21; further comprising a tension spring assembly 30, the tension spring assembly 30 includes two cylindrical springs 31 arranged parallel to each other and spaced apart from each other, one end of the two cylindrical springs 31 is provided with hanging ears 32 respectively hinged to the outside of the extension portion 13 of the second C-shaped clamp 12, the other ends of the two cylindrical springs 31 are provided with pull rods 33 extending in the axial direction of the cylindrical springs 31 and located on both sides of the locking handle 20, and the ends of the two pull rods 33 are connected by a cross bar 34, and the cross bar 34 is adapted to the hanging groove 21; when the locking handle 20 swings along the hinge point and approaches the outer wall of the first C-shaped clamp 11, the hanging groove 21 pulls the cross bar 34 to stretch and store the energy of the cylindrical spring 31 while shrinking the opening 15 and causing the locking handle 20 to cross the dead point position to lock the first C-shaped clamp 11 and the second C-shaped clamp 12 (refer to Figure 1 , Figure 2 , Figure 4 ).

[0025] In the above structure, the first C-shaped clamp 11 and the second C-shaped clamp 12 are connected by a C-shaped elastic sheet 14, and in the unloaded state, the opening 15 is in an open state due to the elastic force of the C-shaped elastic sheet 14 (refer to Figure 3 ), so as to form a space for accommodating a joint (not shown in the figure) between the first C-shaped clamp 11 and the second C-shaped clamp 12; when fixing, turn up the locking handle 20 and hang the cross bar 34 of the tension spring assembly 30 in the hanging groove 21, and then swing the locking handle 20 in the reverse direction to make the locking handle 20 approach the outer wall of the first C-shaped clamp 11, so as to shrink the opening 15 and clamp the joint (not shown in the figure) by the first C-shaped clamp 11 and the second C-shaped clamp 12. At the same time, the cylindrical spring 31 stretches and stores energy to ensure the stability of the clamping of the first C-shaped clamp 11 and the second C-shaped clamp 12, and at the same time, the locking handle 20 is locked after crossing the dead point position to prevent it from being unlocked in the reverse direction; when unlocking, just turn up the locking handle 20 in the reverse direction to make it cross the dead point position. At the same time, the first C-shaped clamp 11 and the second C-shaped clamp 12 are separated from each other under the elastic force of the C-shaped elastic sheet 14, so that the opening 15 is opened, which is suitable for occasions with narrow space and is also convenient for single-handed operation; at the same time, the cylindrical spring 31 has the advantages of good elastic linearity and large extension amount. When the opening degrees of the first C-shaped clamp 11 and the second C-shaped clamp 12 are inconsistent after clamping due to joints of different sizes, dynamic compensation can be carried out by its own stretching and energy storage.

[0026] In this embodiment, after the locking handle 20 crosses the dead point position, the two cylindrical springs 31 are located in the opening 15 between the two extension portions 13.

[0027] In the above structure, the overall structural layout is made more compact.

[0028] In this embodiment, the helix directions of the two cylindrical springs 31 are opposite to each other.

[0029] In the above structure, the consistency of the forces on the two cylindrical springs 31 is ensured.

[0030] In this embodiment, the lugs 32 and the pull rod 33 are both located on the side where the two cylindrical springs 31 are far away from each other.

[0031] In the above structure, it is beneficial for the two cylindrical springs 31 to approach each other within the opening 15.

[0032] In this embodiment, the locking handle 20 includes a handle body 22 and hinge walls 23 located on both sides of the handle body 22. The extension portion 13 of the first C-shaped clip 11 is located between the two hinge walls 23; the hanging groove 21 is opened at the handle body 22.

[0033] In the above structure, the hinge walls 23 are hinged to the extension portion 13 of the first C-shaped clip 11 through a hinge pin; the lug is hinged to the extension portion 13 of the second C-shaped clip 12 through a hinge pin.

[0034] In this embodiment, the handle body 22 and the hinge walls 23 are integrally connected and formed by stamping and bending a metal sheet.

[0035] In the above structure, while ensuring the overall strength, it has the advantages of light weight and convenient processing.

[0036] In this embodiment, on the surfaces of the first C-shaped clip 11 and its extension portion 13, the second C-shaped clip 12 and its extension portion 13 facing each other, there are tightening grooves 16. The groove walls of the tightening grooves 16 are arranged at an angle to form a V shape.

[0037] In the above structure, the tightening grooves 16 at the first C-shaped clip 11 and the second C-shaped clip 12 are used to adapt to a joint (not shown in the figure), and the tightening grooves 16 of the extension portion 13 are used to enhance the rigidity of the extension portion 13.

[0038] In this embodiment, the first C-shaped clip 11 and its extension portion 13, the second C-shaped clip 12 and its extension portion 13, and the C-shaped elastic piece 14 are integrally connected and formed by stamping and bending a metal sheet.

[0039] In the above structure, while ensuring the overall strength, it has the advantages of light weight and convenient processing.

[0040] In this embodiment, the outer wall of the C-shaped elastic piece 14 is provided with a reinforcing groove 141 formed by stamping and presenting an inward concavity. At the same time, the reinforcing groove 141 forms a protruding reinforcing rib 142 on the inner wall of the C-shaped elastic piece 14.

[0041] In the above structure, the elasticity of the C-shaped spring piece 14 can be effectively improved.

[0042] In this embodiment, the two cylindrical springs 31, their lugs 32, the pull rod 33 and the cross bar 34 are integrally formed by bending and curling the spring wire.

[0043] In the above structure, the overall reliability is ensured and the production and assembly are also facilitated.

[0044] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made. These improvements and modifications made under the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A self-expanding clamp, comprising a clamping body, characterized in that: The clamping body includes a semi-circular first C-shaped clip and a second C-shaped clip. One end of each of the first C-shaped clip and the second C-shaped clip is provided with an extension part, and the other ends of the two are connected by a C-shaped elastic sheet so that the end with the extension part forms an openable and closable opening; a locking handle with a hanging groove is hinged to the extension part of the first C-shaped clip; a tension spring assembly is further included. The tension spring assembly includes two cylindrical springs arranged parallel to each other and spaced apart from each other. One end of each of the two cylindrical springs is provided with a hanging ear respectively hinged to the outside of the extension part of the second C-shaped clip. The other ends of the two cylindrical springs are provided with pull rods extending in the axial direction of the cylindrical springs and located on both sides of the locking handle. The ends of the two pull rods are connected by a cross bar, and the cross bar is adapted to the hanging groove; when the locking handle swings along the hinge point and approaches the outer wall of the first C-shaped clip, the hanging groove pulls the cross bar to stretch and store energy in the cylindrical springs, and at the same time contracts the opening and makes the locking handle cross the dead point position to lock the first C-shaped clip and the second C-shaped clip.

2. The self-expanding clamp according to claim 1, wherein: After the locking handle crosses the dead point position, the two cylindrical springs are located in the opening between the two extension parts.

3. The self-expanding clamp according to claim 1, wherein: The winding directions of the two cylindrical springs are opposite to each other.

4. The self-expanding clamp according to claim 1, wherein: The hanging ears and the pull rods are both located on the side where the two cylindrical springs are away from each other.

5. The self-expanding clamp according to claim 1, wherein: The locking handle includes a handle body and hinge walls located on both sides of the handle body. The extension part of the first C-shaped clip is located between the two hinge walls; the hanging groove is formed in the handle body.

6. The self-expanding clamp according to claim 5, characterized in that: The handle body and the hinge walls are integrally connected and are formed by stamping and bending a metal plate.

7. The self-expanding clamp according to claim 1, wherein: On the side where the first C-shaped clip and its extension part, and the second C-shaped clip and its extension part face each other, there are tightening grooves, and the groove walls of the tightening grooves are arranged at an angle to form a V shape.

8. The self-expanding clamp according to claim 7, wherein: The first C-shaped clip and its extension part, the second C-shaped clip and its extension part, and the C-shaped elastic sheet are integrally connected and are formed by stamping and bending a metal plate.

9. The self-expanding clamp according to claim 1 or 7, characterized in that: On the outer wall of the C-shaped elastic sheet, there is a reinforcing groove formed by stamping and presenting a concave shape. At the same time, the reinforcing groove forms a protruding reinforcing rib on the inner wall of the C-shaped elastic sheet.

10. The self-expanding clamp according to claim 1, wherein: The two cylindrical springs and their hanging ears, pull rods, and cross bar are integrally formed by bending and curling a spring wire.

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