Hoop

Abstract

The hoop comprises a plurality of clamping pieces, the two ends of each clamping piece are provided with hinge parts, the number of the clamping pieces is three or more than three, and the hinge parts between the adjacent clamping pieces are hinged through hinge pieces to form a strip-shaped chain body; the clamping piece at the head end of the strip-shaped chain body and the clamping piece at the tail end of the strip-shaped chain body are in butt joint through a connecting mechanism to form an annular hoop body. A hooping groove formed in the circumferential direction of the annular hoop body is formed in the face, facing the center of the annular hoop body, of each clamping piece; a handle is hinged to the hinged portion of the clamping piece at the head end of the strip-shaped chain body, a hooping torsional spring is hinged to the hinged portion of the clamping piece at the tail end of the strip-shaped chain body, and the hooping torsional spring comprises a connecting section hinged to the clamping piece at the tail end of the strip-shaped chain body, a spiral section connected with the connecting section and a hanging buckle section connected with the spiral section. And a hanging buckle part is arranged on the handle. The clamping device has the advantages that the clamping pieces are indirectly hinged through the hinging pieces, the degree of freedom of the clamping pieces in the hooping process is improved, and the fitting performance is improved.

Description

Technical Field

[0001] The invention relates to the field of pipeline connection accessories, in particular to a clamp. Background Art

[0002] A clamp is a connecting device for connecting grooved pipes, valves and pipeline accessories. It is used to tighten quick connectors. Generally, the connectors are equipped with gaskets, rubber, silicone and PTFE.

[0003] At present, clamps generally use multiple clamping parts that are hinged to each other, and then tightened by a buckle lock. When tightening, each clamping part is directly hinged to each other, which restricts the swing freedom of the clamping part itself, so the fit for the pipe joint is poor; specifically, the clamping groove of the clamping part is opened in an arc shape, and it can overlap with the joint when tightening within the standard diameter range. If there is an upper and lower deviation from the standard diameter range when tightening, there will be a tangent state contact (the standard clamping diameter of the clamp is larger than the joint diameter, and the middle section of the clamping groove is in single-point / line contact with the joint) or an external state contact (the standard clamping diameter of the clamp is smaller than the joint diameter, and the two ends of the clamping groove are in double-point / line contact with the joint), resulting in interference between adjacent clamping parts due to direct hinge in the external state contact, affecting the contact of a single clamp. Summary of the invention

[0004] Based on the above problems, the present invention aims to provide a clamp which can indirectly hinge a clamp through a hinge to improve the degree of freedom of the clamp when it is tightened, so as to improve the fit.

[0005] In view of the above problems, the following technical solutions are provided: a clamp comprises a plurality of clamping members, both ends of the clamping members are provided with hinged parts, the number of the clamping members is three or more, the hinged parts between adjacent clamping members are hingedly connected by the hinged parts to form a strip-shaped chain body; the clamping member at the head end of the strip-shaped chain body and the clamping member at the tail end of the strip-shaped chain body are butted together by a connecting mechanism to form an annular hoop body; a clamping groove is provided on one side of the clamping member facing the center of the annular hoop body along the circumferential direction of the annular hoop body; the clamping member at the head end of the strip-shaped chain body is hingedly connected with a handle The hinged part of the clamping piece at the tail end of the strip chain body is hinged with a tightening torsion spring, and the tightening torsion spring includes a connecting section hinged to the clamping piece at the tail end of the strip chain body, a spiral section connected to the connecting section for twisting and storing force, and a hook section connected to the spiral section for connecting to the handle, and the handle is provided with a hook part connected to the hook section; when tightening, the handle moves toward the outer wall of the clamping piece along the hinge point, so that the hook part swings with the hinge point as the center of the circle, so that the clamping piece at the head end of the annular hoop body and the clamping piece at the tail end move closer to each other, and the tightening torsion spring is tightened across the dead point position to achieve locking.

[0006] The present invention is further configured such that the hinge portion is a groove provided at a dividing surface in the clamping member, and the hinge member is in a sheet shape and is hinged in the hinge portion via a pin.

[0007] The present invention is further configured such that a concave retreat arc surface is provided on one side of the hinged member facing the center of the annular hoop body, and the axis of the retreat arc surface is parallel to the central axis of the annular hoop body.

[0008] The present invention is further configured such that the handle is hinged to the hinged part of the clamping piece at the head end of the strip chain body by a pin; the connecting section is C-shaped as a whole and has a hook-shaped portion at the end, and the hook-shaped portion is hinged to the hinged part of the clamping piece at the tail end of the strip chain body by a pin, and the C-shaped opening of the connecting section faces the center direction of the annular hoop body.

[0009] The present invention is further configured such that the pin and the clamping member are fixed by interference fit.

[0010] The present invention is further configured such that the tightening torsion spring is formed by twisting a whole steel wire, and comprises two connecting sections arranged parallel to each other, each connecting section is connected to a spiral section, the spiral directions of the two spiral sections are opposite to each other, the ends are far away from each other and are connected by a hook section located outside the spiral turning surface of the spiral section; the hook section and the connecting section are arranged at an angle with the spiral axis of the spiral section as the center.

[0011] The present invention is further configured such that the clamping member, the handle and the hinged member are all made of metal.

[0012] The present invention is further configured such that groove walls on both sides of the clamping groove are inclined to form a V-shaped angle.

[0013] The present invention is further configured such that the clamping groove further includes a groove bottom located between groove walls on both sides.

[0014] Beneficial effects of the present invention: 1. The clamping parts are connected to each other through hinges, so that two hinge axes are formed between adjacent clamping parts, which reduces the interference between adjacent clamping parts and improves the adaptability and fit with the joint; 2. There are three or more clamping parts to effectively share the extrusion force on the joint, so that the clamping force acting on the circumferential direction of the joint is more uniform; 3. The clamping torsion spring composed of the connecting section, spiral section and hook section can use its spiral section to twist and store force when the connecting section and the hook section are stretched, so as to continuously provide reliable pre-tightening clamping force after the handle passes the dead point position and is locked. At the same time, the clamping range is increased, which is suitable for various pipeline docking with vibration; 4. The handle can be formed by extrusion and cutting of profiles; the clamping part can be made by casting or forging of aluminum alloy; the hinged part can be directly made by punching and cutting; the structure is simple and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of a ring-shaped hoop formed by tightening the strip-shaped chain body of the present invention.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the annular hoop body of the present invention in a loosened state.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the strip chain body of the present invention in the unfolded state from the first viewing angle.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the strip chain body of the present invention in the unfolded state from a second viewing angle.

[0019] Figure 5 It is a schematic diagram of the exploded three-dimensional structure of the strip chain body of the present invention.

[0020] Figure 6 It is a schematic diagram of the full cross-section three-dimensional structure of the strip chain body of the present invention.

[0021] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the clamping member of the present invention.

[0022] Meanings of the numbers in the figure: 10-clamping member; 11-hinge portion; 12-tightening groove; 121-groove wall; 122-groove bottom; 20-hinge member; 21-retractable arc surface; 30-handle; 31-hook portion; 40-tightening torsion spring; 41-connecting section; 411-hook portion; 42-spiral section; 43-hook section; 50-pin. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] refer to Figures 1 to 7 ,like Figures 1 to 7A clamp shown in the figure comprises a plurality of clamping members 10, both ends of which are provided with hinged parts 11, the number of the clamping members 10 is three or more, the hinged parts 11 between adjacent clamping members 10 are hingedly connected by hinged members 20 to form a strip-shaped chain body; the clamping member 10 at the head end of the strip-shaped chain body and the clamping member 10 at the tail end of the strip-shaped chain body are butted together by a connecting mechanism to form an annular hoop body; a clamping groove 12 is provided on one side of the clamping member 10 facing the center of the annular hoop body along the circumferential direction of the annular hoop body; the hinged part 11 of the clamping member 10 at the head end of the strip-shaped chain body is hingedly connected with a handle 30, and the clamping member 10 at the tail end of the strip-shaped chain body is connected with a handle 30. 10 The hinged portion 11 is hinged with a tightening torsion spring 40, and the tightening torsion spring 40 includes a connecting section 41 hinged to the clamping piece 10 at the tail end of the strip chain body, a spiral section 42 connected to the connecting section 41 for twisting and storing force, and a hook section 43 connected to the spiral section 42 for connecting with the handle 30, and the handle 30 is provided with a hook portion 31 connected to the hook section 43; when tightening, the handle 30 moves toward the outer wall of the clamping piece 10 along the hinge point, so that the hook portion 31 swings with the hinge point as the center of the circle, so that the clamping piece 10 at the head end of the annular hoop body and the clamping piece 10 at the tail end move closer to each other, and the tightening torsion spring 40 is tightened across the dead point position to achieve locking.

[0025] In the above structure, the clamping members 10 are arranged into several pieces and connected to each other to form a strip chain body, which are butt-jointed and fixed between the head and tail of the strip chain body by a connecting mechanism, so that the clamping members 10 at the head and tail positions of the strip chain body gradually approach each other, thereby reducing the radial size of the annular hoop body to tighten the butt joint; since the annular hoop body is composed of several clamping members 10, adjacent ones are connected by hinges 20, so that the original one hinge point between adjacent clamping members 10 is changed to two hinge points, reducing the mutual influence between the clamping members 10, providing more fitting freedom for the clamping members 10, and dividing the tightening force equally in the circumferential direction of the joint according to the number of arc-shaped clamping members 10, while providing a better fitting effect, so that the extrusion force acting on the joint during tightening is more uniform, reducing joint deformation, and having the advantages of simple structure, convenient installation, and uniform force during tightening.

[0026] In this embodiment, the hinge portion 11 is a groove formed on a dividing surface of the clamping member 10 , and the hinge member 20 is in a sheet shape and is hinged in the hinge portion 11 via a pin 50 .

[0027] In the above structure, the sheet-shaped connecting member can reduce the slot width and improve the overall strength of the clamping member 10 .

[0028] In this embodiment, a concave retreat arc surface 21 is provided on one side of the hinge 20 facing the center of the annular hoop body, and the axis of the retreat arc surface 21 is parallel to the central axis of the annular hoop body.

[0029] In the above structure, space is given to the outer wall of the joint to avoid conflict with the outer wall of the joint.

[0030] In this embodiment, the handle 30 is hinged to the hinge part 11 of the clamping piece 10 at the head end of the strip chain body through a pin 50; the connecting section 41 is C-shaped as a whole and has a hook-shaped portion 411 at the end, and the hook-shaped portion 411 is hinged to the hinge part 11 of the clamping piece 10 at the tail end of the strip chain body through the pin 50, and the C-shaped opening of the connecting section 41 is facing the center direction of the annular hoop body.

[0031] In the above structure, the C-shaped opening of the connecting section 41 is opened when tightening, so as to further increase the tightening range and avoid interference with the clamping member 10 and the handle 30 .

[0032] In this embodiment, the pin 50 and the clamping member 10 are fixed by interference fit.

[0033] In the above structure, the handle 30, the tightening torsion spring 40 and the hinge 20 are guaranteed to swing freely while preventing the pin 50 from falling out.

[0034] In this embodiment, the tightening torsion spring 40 is formed by twisting a whole steel wire, and includes two connecting sections 41 arranged side by side, each connecting section 41 is connected to a spiral section 42, the spiral directions of the two spiral sections 42 are opposite to each other, the ends are far away from each other, and are connected by a hook section 43 located on the outside of the spiral rotation surface of the spiral section 42; the hook section 43 and the connecting section 41 are arranged at an angle with the spiral axis of the spiral section 42 as the center.

[0035] In the above structure, the connecting segments 41 arranged in parallel with each other are combined with the spiral segments 42 with opposite spiral directions, and then connected by the hook segment 43, which can effectively stabilize the force direction. The hook segment 43 and the connecting segment 41 are arranged at an angle with the spiral axis of the spiral segment 42 as the center, and the torsional effect of the torsion spring is used to ensure the clamping force.

[0036] In this embodiment, the clamping member 10, the handle 30, and the hinged member 20 are all made of metal.

[0037] In the above structure, the clamping member 10 and the handle 30 are preferably made of aluminum alloy to reduce the overall weight; since the hinge 20 is sheet-shaped, the overall force will be more concentrated, so the hinge 20 is preferably made of steel to ensure strength.

[0038] In this embodiment, the groove walls 121 on both sides of the clamping groove 12 are inclined to form a V-shaped angle.

[0039] In the above structure, the groove walls 121 on both sides of the clamping groove 12 are adapted to the joints, and as the clamping force increases, the two joints are pushed closer to each other to achieve docking and sealing.

[0040] In this embodiment, the clamping groove 12 further includes a groove bottom 122 located between the groove walls 121 on both sides.

[0041] In the above structure, the groove bottom 122 is a plane or an arc, which can effectively reduce stress concentration and effectively reduce the radial size of the annular hoop body when the joints with the same diameter are connected.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the scope of protection of the present invention.

Claims

1. A clamp, comprising a plurality of clamping members, both ends of which are provided with hinged portions, characterized in that: There are three or more clamping pieces, and the hinged parts between adjacent clamping pieces are hinged through the hinged pieces to form a strip-shaped chain body; the clamping piece at the head end of the strip-shaped chain body and the clamping piece at the tail end of the strip-shaped chain body are connected to form an annular hoop body through a connecting mechanism; a clamping groove is provided along the circumferential direction of the annular hoop body on one side of the clamping piece facing the center of the annular hoop body; the clamping piece at the head end of the strip-shaped chain body is hinged with a handle at its hinged part, and the clamping piece at the tail end of the strip-shaped chain body is hinged with a clamping groove at its hinged part The torsion spring comprises a connecting section hinged to a clamping piece at the tail end of the strip chain body, a spiral section connected to the connecting section for twisting and storing force, and a hook section connected to the spiral section for connecting to a handle, wherein the handle is provided with a hook portion connected to the hook section; when tightening, the handle moves toward the outer wall of the clamping piece along the hinge point, so that the hook portion swings with the hinge point as the center of the circle, so that the clamping piece at the head end of the annular hoop body and the clamping piece at the tail end move closer to each other, and the tightening torsion spring is tightened across the dead point position to achieve locking.

2. A clamp according to claim 1, characterized in that: The hinged part is a groove formed on a dividing surface of the clamping part, and the hinged part is in a sheet shape and is hinged in the hinged part through a pin.

3. A clamp according to claim 1 or 2, characterized in that: A concave retreat arc surface is provided on one side of the hinged part facing the center of the annular hoop body, and the axis of the retreat arc surface is parallel to the central axis of the annular hoop body.

4. A clamp according to claim 2, characterized in that: The handle is hinged to the hinged part of the clamping piece at the head end of the strip chain body by a pin; the connecting section is C-shaped as a whole and has a hook-shaped part at the end, and the hook-shaped part is hinged to the hinged part of the clamping piece at the tail end of the strip chain body by a pin, and the C-shaped opening of the connecting section faces the center direction of the annular hoop body.

5. A clamp according to claim 4, characterized in that: The pin and the clamping piece are fixed by interference fit.

6. A clamp according to claim 1, characterized in that: The tightening torsion spring is formed by twisting a whole steel wire, and includes two connecting sections arranged side by side, each connecting section is connected to a spiral section, the spiral directions of the two spiral sections are opposite to each other, the ends are far away from each other, and are connected by a hook section located outside the spiral rotation surface of the spiral section; the hook section and the connecting section are arranged at an angle with the spiral axis of the spiral section as the center.

7. A clamp according to claim 1, characterized in that: The clamping piece, the handle and the hinged piece are all made of metal.

8. The clamp according to claim 1, characterized in that: The groove walls on both sides of the clamping groove are inclined to form a V-shaped angle.

9. A clamp according to claim 8, characterized in that: The clamping groove also includes a groove bottom located between the groove walls on both sides.

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