A clamp

Abstract

The utility model discloses a clamp, including at least two sections of clamping part, at least one pivot part and connecting part, pivot part is located between the adjacent clamping part, and connecting part is also located between the adjacent clamping part, and with pivot part cooperation makes at least two sections of clamping part form closed structure, pivot part includes cylinder axle, first lock position part and second lock position part, first lock position part is located in the end of one of adjacent clamping part, and second lock position part is located in the end of another of adjacent clamping part, and after the first end of cylinder axle passes through receiving hole, first lock position part and second lock position part can cooperate and limit adjacent clamping part rotates around the second axis. Because first lock position part and second lock position part make two clamping parts not rotate around the second axis, the side surface and end surface of two clamping parts will automatically align, and cylinder axle is connected with one of clamping parts, first axis is perpendicular to second axis, so when locking cylinder axle, cylinder axle also will not self-rotate, and the operation is more convenient, and one hand can also operate.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and in particular to a clamp. Background Technology

[0002] In the pharmaceutical, food, and related industries, material conveying pipelines are required. These pipelines can be connected using methods such as flange connections, welding, fusion welding, and clamp connections. For large-sized material conveying pipelines, clamp connections offer advantages such as ease of operation, construction safety, and good stability. Currently used clamps generally consist of a clamp and screws and nuts located at both ends of the clamp. The clamp has through holes at both ends, and the screws pass through the through holes of adjacent clamps and are locked in place by nuts, thus achieving a tight seal between the clamp and the pipeline.

[0003] However, the existing clamps have the following drawbacks: when tightening the nut, the screw will rotate with the nut, and anti-rotation measures must be taken at the other end of the screw. Generally, it requires the cooperation of two or more people to complete the task, and it is difficult to operate by one person. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a clamp that solves the problem that existing clamps are difficult to operate with one hand.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A clamp, comprising at least two clamping sections,

[0007] It also includes at least one pivot portion and a connecting portion, the pivot portion being located between adjacent clamping portions, the connecting portion also being located between adjacent clamping portions, and cooperating with the pivot portion to form a closed structure with clamping channels in at least two clamping portions;

[0008] One of the adjacent clamping portions has a receiving hole at its end. The pivot portion includes a cylindrical shaft. The end of the cylindrical shaft is rotatably connected to the other of the adjacent clamping portions about a first axis. The beginning end of the cylindrical shaft can pass through the receiving hole, so that the clamping portion with the receiving hole can rotate about the first axis relative to the adjacent clamping portion. After the adjacent clamping portions are aligned with each other along the axial direction of the receiving hole, the beginning end of the cylindrical shaft is locked to engage the opposite ends of the adjacent clamping portions.

[0009] The cylindrical shaft has a second axis perpendicular to the first axis. The pivoting part further includes a first locking part and a second locking part. The first locking part is located at the end of one of the adjacent clamping parts, and the second locking part is located at the end of the other of the adjacent clamping parts. After the first end of the cylindrical shaft passes through the receiving hole, the first locking part and the second locking part can cooperate to restrict the adjacent clamping parts from rotating about the second axis.

[0010] The clamp of this utility model includes at least two separate clamping parts, that is, the clamping parts are independent of each other and are connected by a pivoting part or a connecting part at adjacent ends, ultimately forming a closed structure with a clamping channel to clamp the pipe fitting, and the pipe fitting is located in the clamping channel; the pivoting part allows the adjacent clamping parts to rotate relative to each other to open and close, making it easier for the clamp to be fitted onto the pipe fitting, and the connecting part can connect the ends of the adjacent clamping parts to ultimately achieve clamping of the pipe fitting.

[0011] The split clamping parts make the clamp installation more flexible, convenient, and adaptable. The pivoting and connecting parts enable phased assembly, making the operation more efficient. When assembling the clamp, the ends of adjacent clamping parts are first connected via the pivoting part. Specifically, the cylindrical shaft of the pivoting part is rotatably connected to the end of one clamping part, and then passes through the receiving hole at the end of the other clamping part. At this point, the two clamping parts can rotate around both a first and a second axis. Then, the cooperation of the first and second locking parts restricts the rotation of the two clamping parts around the second axis, but they can still rotate around the first axis. Adjacent clamping parts can be opened or closed with one hand. During assembly, only rough alignment is needed, and the clamping parts can rotate freely to the closed position. Simultaneously, because the rotation of the two clamping parts around the second axis is restricted, the two clamping parts do not require manual alignment in the closed position. The sides and end faces of the two clamping parts will be aligned with the first and second locking parts. Automatic alignment under the action of the positioning part facilitates the connection of the pivot or connecting part at the other end, making it suitable for one-handed operation. The cylindrical shaft, the first locking part, and the second locking part have clearly defined functions and bear forces in different directions at different stages of assembly, improving structural strength and enabling them to withstand greater impact torque and shear torque. Then, the clamp is fitted onto the pipe fitting, and the ends of the two clamping parts are connected by the connecting part to form a closed structure. Finally, the clamping force of the entire clamp on the pipe fitting is adjusted by the pivot and connecting parts to ensure that the circumferential clamping force of the clamp on the pipe fitting is balanced, which helps to avoid deformation of the pipe fitting. At the same time, since the cylindrical shaft is connected to one of the clamping parts and the first axis is perpendicular to the second axis, the cylindrical shaft will not rotate when it is locked, making operation more convenient and allowing for one-handed operation.

[0012] Preferably, the first locking part includes a protrusion, and the second locking part includes a groove. The protrusion is fixedly connected to the end of one of the adjacent clamping parts or is an integral structure. The groove is formed at the end of the other of the adjacent clamping parts. The protrusion and the groove are located in the circumferential direction of the cylindrical shaft and can be inserted to restrict the adjacent clamping parts from rotating around the second axis.

[0013] The first and second locking parts are fixed to the ends of the clamping parts, requiring no additional parts and preventing loss and malfunction. The insertion and engagement of the protrusion and groove is simple and easy to operate. Since the protrusion and groove are located circumferentially on the cylindrical shaft, after insertion, they restrict the circumferential rotation of the cylindrical shaft and the receiving hole, thereby limiting the rotation of adjacent clamping parts around the second axis. The positioning of the protrusion and groove ensures that the sides and end faces of adjacent clamping parts automatically align after insertion, facilitating subsequent operations.

[0014] Preferably, the protrusion is a non-cylindrical structure, and the groove is a non-cylindrical groove adapted to the protrusion, so that the protrusion and groove have higher guidance when inserted, making insertion easier and allowing for "fine adjustment after coarse positioning". This is more relaxed than the strict coaxiality requirements of cylindrical insertion, making it easier to operate. When the clamp is subjected to pipeline vibration or fluid impact torque, the non-arc mating surface between the non-cylindrical protrusion and groove provides a large area of ​​shear bearing, which can significantly improve the clamp's torsional performance and structural stability. In addition, compared with cylindrical or circular hole structures, non-cylindrical structures such as rectangles, trapezoids, triangles, and polygons have the advantage of being easier to process, easier to machine using milling and wire cutting, with lower processing accuracy requirements and lower costs.

[0015] Preferably, in the same pivot portion, the protrusion is located at the end of the clamping portion having the receiving hole and extends axially along the receiving hole, and the groove is located at the end of the clamping portion having the cylindrical shaft and extends along the second axis to receive the protrusion when the two clamping portions are mated.

[0016] The protrusion and receiving hole are located at the end of the same clamping part, and the extension direction of the protrusion is the same as the axial direction of the receiving hole. The groove and cylindrical shaft are located at the end of another clamping part, and the insertion direction of the groove is the same as the direction of the second axis. With this configuration, when the cylindrical shaft on one clamping part passes through the receiving hole on the other clamping part, the protrusion and groove are in a relative state. The two clamping parts only need to move a small distance along the direction of the second axis to insert the protrusion into the groove. The operation is very simple. After the protrusion and groove are inserted, the cylindrical shaft and receiving hole are also fully inserted, forming a two-way insertion fit, which has higher structural stability. After insertion, the cylindrical shaft and protrusion bear forces in different directions, which optimizes the stress state and avoids the force being concentrated on the same clamping part, preventing the single clamping part from being overloaded.

[0017] Preferably, the groove is formed by two spaced protrusions at the end of the clamping part, the end of the cylindrical shaft is located between the two protrusions, the end of the cylindrical shaft has a rotating shaft, the rotating shaft extends along the first axis and is connected to the two protrusions; the groove is connected to the space where the rotating shaft is located, the processing method is simple, and it can be completed by simple cutting and drilling processes.

[0018] When the protrusion is placed in the groove, it is spaced apart from or tangential to the end of the cylindrical shaft. At this time, the cylindrical shaft is already inserted into the receiving hole, the protrusion is stationary relative to the end of the cylindrical shaft, and they do not interfere with each other. This does not affect the rotation of the cylindrical shaft and the clamping part around the first axis, ensuring that the two clamping parts can smoothly unfold and close relative to each other.

[0019] Preferably, the first end of the cylindrical shaft has a thread and is provided with a threaded cap that is threadedly connected to it. The threaded cap abuts against the clamping part to lock the opposite ends of the adjacent clamping parts. The position of the threaded cap on the cylindrical shaft is adjustable. After initial contact, it can ensure that the pivot part can rotate freely. By adjusting the position of the threaded cap on the cylindrical shaft again, the distance between the opposite ends of the two clamping parts can be adjusted, thereby adjusting the clamping force of the entire clamp on the pipe fitting.

[0020] Preferably, the end of the clamping part where the pivot is located is defined as the pivot end of the clamping part, the side of the clamping part away from the center of the clamp is the outer side, and the outer sides of the opposing surfaces of the two pivot ends are provided with a clearance angle, the angle range of which is 60-120°. When the ends of the two clamping parts approach each other and rotate around the first axis to open, the clearance angle can prevent the outer sides of the ends of the two clamping parts from interfering with each other, ensuring the free rotation of the two clamping parts; when the clamp has different numbers of clamping parts, the required opening angle of each clamping part is different, and the angle range of the clearance angle corresponds to different opening angles.

[0021] Preferably, the end of the clamping portion where the pivot portion is provided is defined as the pivot end of the clamping portion, and the end of the clamping portion where the connecting portion is provided is defined as the connecting end of the clamping portion.

[0022] A gap is provided between the opposing surfaces of adjacent pivot ends, and / or a gap is provided between the opposing surfaces of adjacent connecting ends.

[0023] The gap between the pivot end and / or the connecting end can provide a certain adjustment margin to compensate for the dimensional errors of the clamped pipe fitting or the clamping part itself. It can also be used to adjust the distance between each clamping part, thereby adjusting the clamping force of the entire clamp on the pipe fitting.

[0024] Preferably, one of the opposing faces of adjacent pivot ends is provided with a protrusion, the protrusion being located outside the axis of the cylindrical shaft and capable of abutting against the other of the opposing faces of adjacent pivot ends; and / or

[0025] One of the opposing surfaces of the adjacent connecting ends is provided with a protrusion, the protrusion being located on the side of the opposing surface away from the center of the clamp, and capable of abutting against the other of the opposing surfaces of the adjacent connecting ends.

[0026] When the clamp formed by multiple clamping parts clamps the object, the protrusions on the opposite ends of adjacent clamping parts abut against each other. At the same time, since there is still a gap on the inside, it can still fill the dimensional error. The abutting protrusions can improve the overall stability of the clamp, thereby improving the clamping stability and force uniformity.

[0027] Preferably, the end of the clamping part provided with the connecting part is defined as the connecting end of the clamping part, and the connecting part is rotatably connected to one of the connecting ends and snapped and locked to the other connecting end.

[0028] After the clamp of this utility model is fitted onto the pipe fitting to be clamped, rotating the pivot part and the clamping part causes the clamping part to fit against the outer surface of the pipe fitting. At this time, the connecting ends of adjacent clamping parts are close to each other and aligned. Rotating the connecting part on one connecting end makes it clamp with the other connecting end, achieving pre-locking, and then locking to complete the clamping and fixing. The connecting part is pre-connected to one of the connecting ends, eliminating the need for bolts to pass through the two connecting ends again. Moreover, the rotation and snap-fit ​​method can prevent the connecting part from self-pinning during locking, making operation more convenient and allowing for one-handed operation.

[0029] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The clamp of this utility model includes at least two separate clamping parts, that is, the clamping parts are independent of each other and are connected by a pivoting part or a connecting part at adjacent ends, ultimately forming a closed structure with a clamping channel to clamp and fix the pipe fitting; the pivoting part allows the adjacent clamping parts to rotate relative to each other to open and close, making it easier to put the clamp on the pipe fitting, and the connecting part can connect the ends of the adjacent clamping parts to ultimately achieve clamping and fixing of the pipe fitting.

[0031] The split clamping parts make the clamp installation more flexible, convenient, and adaptable. The pivoting and connecting parts enable phased assembly, making the operation more efficient. When assembling the clamp, the ends of adjacent clamping parts are first connected via the pivoting part. Specifically, the cylindrical shaft of the pivoting part is rotatably connected to the end of one clamping part, and then passes through the receiving hole at the end of the other clamping part. At this point, the two clamping parts can rotate around both a first and a second axis. Then, the cooperation of the first and second locking parts restricts the rotation of the two clamping parts around the second axis. When the two clamping parts can still rotate around the first axis, adjacent clamping parts can be opened or closed with one hand. During assembly, only rough alignment is needed, and the clamping parts can rotate freely to the closed position. Simultaneously, because the rotation of the two clamping parts around the second axis is restricted, the two clamping parts are closed... The clamping positions do not require manual alignment. The sides and end faces of the two clamping parts will automatically align under the action of the first and second locking parts, facilitating the connection of the pivot or connecting part at the other end. This is suitable for one-handed operation. Then, the clamp is placed on the pipe fitting, and the ends of the two clamping parts are connected by the connecting part to form a closed structure. Finally, the clamping force of the entire clamp on the pipe fitting is adjusted by the pivot and connecting parts to ensure that the circumferential clamping force of the clamp on the pipe fitting is balanced, which helps to avoid deformation of the pipe fitting. At the same time, since the cylindrical shaft is connected to one of the clamping parts and the first axis is perpendicular to the second axis, the cylindrical shaft will not rotate when it is locked, making the operation more convenient and allowing for one-handed operation. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the clamp structure according to an embodiment of the present utility model;

[0034] Figure 2 This is a cross-sectional schematic diagram of the clamp according to an embodiment of the present utility model;

[0035] Figure 3 This is a side view of the pivot portion of the clamp according to an embodiment of the present utility model;

[0036] Figure 4 This is a schematic diagram of the clamping part in an embodiment of the present utility model;

[0037] Figure 5 This is a schematic diagram of the clamping part from another angle in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the clamping part from another angle in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the connecting part structure of an embodiment of the present utility model.

[0040] Explanation of reference numerals in the attached figures

[0041] 10. Clamping part; 11. Protruding plate; 12. Shaft hole; 13. Rotating shaft; 14. Clearance angle; 15. Clearance; 16. Protrusion; 17. Connecting end; 18. Pivoting end; 19. Clamping channel;

[0042] 20. Pivot section; 21. Cylindrical shaft; 22. Receiving hole; 23. Raised rib; 24. Groove; 25. Shaft hole; 26. Threaded cap;

[0043] 30. Connecting part; 31. Bolt shaft; 32. Nut head; 33. Slot. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] The clamp includes at least two clamping parts 10, at least one pivoting part 20, and a connecting part 30. The clamping parts 10 are independent of each other and are connected by the pivoting part 20 or the connecting part 30 at adjacent ends to form a closed structure for clamping the pipe fitting. The pivoting part 20 allows the adjacent clamping parts 10 to rotate relative to each other to open and close, making it easier for the clamp to be fitted onto the pipe fitting. The connecting part 30 can connect the ends of the adjacent clamping parts 10 to ultimately clamp the pipe fitting.

[0048] like Figure 1 As shown, taking two clamping parts 10 in conjunction with a pivot part 20 and a connecting part 30 as an example, the pivot part 20 is located between a set of opposite ends of the two clamping parts 10, and the connecting part 30 is located between another set of opposite ends. The two clamping parts 10, together with the pivot part 20 and the connecting part 30, form a closed structure. The inner circumferential surface of the closed structure is arranged to form a clamping channel 19 for accommodating the pipe fitting. The radial cross section of the clamping channel 19 is approximately circular. The two clamping parts 10 are respectively located at two parts of the circle. The central angles of the two clamping parts 10 can be equal, both being 180°, or they can be one large and one small.

[0049] In some embodiments, if the number of clamping parts 10 is three, then two pivoting parts 20 and one connecting part 30 can be provided. The two pivoting parts 20 can be located between the two ends of one clamping part 10 and the end of the adjacent clamping part 10, respectively, so that the three clamping parts 10 can open and close relative to each other. The connecting part 30 is located between the other two ends of the adjacent clamping parts 10. The three clamping parts 10 correspond to the three parts of a circle, and the central angles of the three clamping parts 10 can be equal, all being 120°, or they can be combined in different sizes, or other combinations. The same applies to other numbers of clamping parts 10. The number of connecting parts 30 can be greater than one, which will not be elaborated here. Preferably, the number of connecting parts 30 is one, and the number of pivoting parts 20 is one less than the number of clamping parts 10, making the clamp operation more convenient.

[0050] like Figures 1 to 6 The embodiment shown illustrates the structure of the clamping part 10, the pivot part 20, and the connecting part 30 by taking two clamping parts 10 in conjunction with a pivot part 20 and a connecting part 30 as an example. In this embodiment, as... Figure 1 As shown, the end of the clamping part 10 with the pivot part 20 is defined as the pivot end 18 of the clamping part 10, and the end of the clamping part 10 with the connecting part 30 is defined as the connecting end 17 of the clamping part 10. The side closer to the center of the clamping channel 19 of the clamp is the inner side, and the side farther from the center of the clamping channel 19 of the clamp is the outer side.

[0051] like Figure 2As shown, the pivoting part 20 includes a cylindrical shaft 21. On the end of the adjacent clamping part 10 corresponding to the pivoting part 20, one end has a receiving hole 22, and the other end has a first axis O1. The end of the cylindrical shaft 21 is rotatably connected to the other end, allowing the cylindrical shaft 21 to rotate about the first axis O1. The head end of the cylindrical shaft 21 can pass through the receiving hole 22, allowing the clamping part 10 with the receiving hole 22 to rotate about the first axis O1 relative to the adjacent clamping part 10. The cylindrical shaft 21 has a connection with the first axis... The pivoting part 20, which is perpendicular to the second axis O2, also includes a first locking part and a second locking part. The first locking part is located at the end of one of the adjacent clamping parts 10, and the second locking part is located at the end of the other of the adjacent clamping parts 10. After the first end of the cylindrical shaft 21 passes through the receiving hole 22, the first locking part and the second locking part can cooperate to restrict the adjacent clamping parts 10 from rotating about the second axis. Then, after the adjacent clamping parts 10 are axially opposite each other along the receiving hole 22, the first end of the cylindrical shaft 21 is locked to engage the opposite ends of the adjacent clamping parts 10.

[0052] Specifically, when assembling the clamps, the ends of adjacent clamping parts 10 are first connected via a pivot part 20. Specifically, the cylindrical shaft 21 of the pivot part 20 is rotatably connected to the end of one clamping part 10, and then passes through the receiving hole 22 at the end of the other clamping part 10. At this point, the two clamping parts 10 can rotate around both the first axis O1 and the second axis O2. Then, through the cooperation of the first locking part and the second locking part, the rotation of the two clamping parts 10 around the second axis O2 is restricted, but the two clamping parts 10 can still rotate around the first axis O1. Adjacent clamping parts 10 can be opened or closed with one hand. During assembly, only rough alignment is needed, and the clamping parts 10 can freely rotate to the closed position. Simultaneously, because the rotation of the two clamping parts 10 around the second axis O2 is restricted, the two clamping parts 10 do not need to be manually aligned in the closed position, and the sides and end faces of the two clamping parts 10 will... The cylinder shaft 21 automatically aligns under the action of the first and second locking parts, facilitating the connection of the pivot part 20 or the connecting part 30 at the other end, making it suitable for one-handed operation. The functions of the cylindrical shaft 21, the first locking part, and the second locking part are clearly defined, and they bear forces in different directions at different stages of assembly, improving structural strength and enabling them to withstand greater impact torque and shear torque. Then, the clamp is fitted onto the pipe fitting, and the ends of the two clamping parts 10 are connected by the connecting part 30 to form a closed structure. Finally, the clamping force of the entire clamp on the pipe fitting is adjusted by the pivot part 20 and the connecting part 30 to ensure that the circumferential clamping force of the clamp on the pipe fitting is balanced, which helps to avoid deformation of the pipe fitting. At the same time, since the cylindrical shaft 21 is connected to one of the clamping parts 10, the first axis O1 is perpendicular to the second axis O2, and the cylindrical shaft 21 will not rotate when it is locked, making operation more convenient and allowing for one-handed operation.

[0053] There are various forms of the first and second locking parts, such as the cooperation between the anti-rotation protrusion 16 and the anti-rotation groove, or the cooperation between the anti-rotation sleeve and the anti-rotation block. Figure 2 and Figure 3 In the illustrated embodiment, the first locking part and the second locking part are respectively fixed to the ends of the clamping part 10, eliminating the need for additional parts and preventing loss and failure. The first locking part includes a protrusion 23, and the second locking part includes a groove 24. The protrusion 23 is fixedly connected to the end of one of the adjacent clamping parts 10 or is an integral structure. The groove 24 is formed at the end of the other adjacent clamping part 10. The insertion and engagement of the protrusion 23 and the groove 24 is simple and easy to operate. The positioning of the protrusion 23 and the groove 24 ensures that after insertion, the sides and end faces of the adjacent clamping parts 10 are automatically aligned, facilitating subsequent operations. Figure 2 As shown, the protrusion 23 and the groove 24 are located in the circumferential direction of the cylindrical shaft 21. After the protrusion 23 and the groove 24 are inserted, a positioning point is formed that is fixed relative to the second axis O2 and simultaneously fixedly connected to the two clamping parts 10. The position of the positioning point remains unchanged, which restricts the circumferential rotation of the cylindrical shaft 21 and the receiving hole 22, thereby restricting the adjacent clamping parts 10 from rotating around the second axis.

[0054] The protrusion 23 is a non-cylindrical structure and can be rectangular, trapezoidal, triangular, polygonal, or other shapes. The groove 24 is a non-cylindrical groove 24 that matches the shape of the protrusion 23, such as... Figure 4 As shown, in this embodiment, the protrusion 23 is rectangular, and the groove 24 is a rectangular slot with three openings, facilitating the insertion of the protrusion 23 into the groove 24. The non-cylindrical protrusion 23 provides higher guidance when inserted into the groove 24, making insertion easier and allowing for "coarse positioning followed by fine adjustment," which is more lenient than the strict coaxiality requirements of cylindrical insertion, thus making operation easier. When the clamp is subjected to pipe vibration or fluid impact torque, the non-arc mating surface between the non-cylindrical protrusion 23 and the groove 24 provides a large area of ​​shear bearing capacity, significantly improving the clamp's torsional resistance and structural stability. Furthermore, compared to cylindrical or circular hole structures, non-cylindrical structures such as rectangles, trapezoids, triangles, and polygons are easier to process, easier to machine using milling and wire cutting, have lower precision requirements, and lower costs.

[0055] like Figure 4As shown, in the same pivot part 20, the protrusion 23 is located at the end of the clamping part 10 with the receiving hole 22 and extends along the axial direction of the receiving hole 22. That is, the protrusion 23 and the receiving hole 22 are disposed at the end of the same clamping part 10, and the extending direction of the protrusion 23 is the same as the axial direction of the receiving hole 22. The groove 24 is located at the end of the clamping part 10 with the cylindrical shaft 21 and extends along the second axis. That is, the groove 24 and the cylindrical shaft 21 are disposed at the end of another clamping part 10. The insertion direction of the groove 24 is the same as the direction of the second axis O2, so as to receive the protrusion 23 when the two clamping parts 10 are mated. With this arrangement, when one of the clamping parts is engaged, the protrusion 23 is received. When the cylindrical shaft 21 on the holding part 10 passes through the receiving hole 22 on the other clamping part 10, the protrusion 23 and the groove 24 are in a relative state. The two clamping parts 10 only need to move a small distance along the direction of the second axis O2 to insert the protrusion 23 into the groove 24. The operation is very simple. After the protrusion 23 and the groove 24 are inserted, the cylindrical shaft 21 and the receiving hole 22 are also fully inserted, forming a two-way insertion fit. The structure is more stable. After insertion, the cylindrical shaft 21 and the protrusion 23 bear the force in different directions, which optimizes the force state and avoids the force being concentrated on the same clamping part 10, causing a single clamping part 10 to be overloaded.

[0056] Specifically, the groove 24 is formed by two spaced protrusions 11 at the end of the clamping part 10. The space between the two protrusions 11 forms a groove 24 with openings on three sides. The two protrusions 11 are provided with shaft holes 12 for a rotating shaft 13 with a first axis to pass through. The end of the cylindrical shaft 21 is provided with a rotating shaft hole 25. The rotating shaft 13 passes through the shaft hole 12 and the rotating shaft hole 25 and is connected to the protrusions 11. The groove 24 is connected to the space where the rotating shaft 13 is located. The processing method is simple and can be completed by simple cutting and drilling processes.

[0057] In some embodiments, the rotating shaft 13 may be fixed relative to the cylindrical shaft 21 and rotate together with the cylindrical shaft 21 about the first axis O1. In other embodiments, the rotating shaft 13 may also be fixed relative to the protruding plate 11, and the cylindrical shaft 21 may rotate relative to the rotating shaft 13 and the protruding plate 11 about the first axis O1. The cylindrical shaft 21 may be pre-connected to the rotating shaft 13, and the assembly of the pivot part 20 can be completed by simply passing the cylindrical shaft 21 through the receiving hole 22 during subsequent clamp assembly.

[0058] To ensure the normal rotation of the pivot 20, such as Figure 2As shown, when the protrusion 23 is placed in the groove 24, the first end of the cylindrical shaft 21 also passes through the receiving hole 22. The cylindrical shaft 21 is stationary relative to the clamping part 10 with the protrusion 23, and is spaced apart from or tangential to the end of the cylindrical shaft 21. The end of the cylindrical shaft 21 has a columnar structure with the first axis O1 as the central axis. The protrusion 23 is spaced apart from or tangential to the end of the cylindrical shaft 21, that is, the protrusion 23 is radially spaced apart from or tangential to the outer peripheral surface of the columnar structure. When the two clamping parts rotate relative to each other, the protrusion 23 rotates together with one of the clamping parts 10 and the cylindrical shaft 21. The protrusion 23 is also relatively stationary relative to the end of the cylindrical shaft 21. The protrusion 23 will not contact the columnar structure or will only be tangent to the outer peripheral surface of the columnar structure. It will also not contact or collide with the other clamping part 10 which has the first axis O1. Therefore, the protrusion 23 does not affect the rotation of the cylindrical shaft 21 and the clamping part 10 around the first axis, ensuring that the two clamping parts 10 can smoothly open and close relative to each other.

[0059] In some embodiments, after the clamp forms a closed structure, the ends of adjacent clamping parts 10 abut against each other. If the clamp needs to be removed from the pipe fitting, the clamping parts 10 and the pivoting parts 20 need to be rotated. Therefore, the outer sides of the opposing surfaces of the two pivoting ends 18 are provided with a clearance angle 14, the angle range of the clearance angle 14 being 60-120°. Thus, when the ends of the two clamping parts 10 abut against each other and need to rotate around the first axis to open, the clearance angle 14 can prevent the outer sides of the ends of the two clamping parts 10 from interfering with each other, ensuring the free rotation of the two clamping parts 10. When the clamp has a different number of clamping parts 10, the opening angle required for each clamping part 10 is different, and the angle range of the clearance angle 14 corresponds to different opening angles. For example, when a clamp includes two clamping parts 10, the angle range of the clearance angle 14 needs to be larger, as close as possible to 120°. When a clamp includes five or more clamping parts 10, the angle range of the clearance angle 14 can be smaller, close to 60°.

[0060] like Figure 1 As shown, a gap 15 is provided between the opposing surfaces of adjacent pivot ends 18 and adjacent connecting ends 17. The gap 15 provides a certain adjustment margin to compensate for the dimensional errors of the clamped pipe fitting or the clamping part 10 itself. It can also be used to adjust the distance between each clamping part 10, thereby adjusting the clamping force of the entire clamp on the pipe fitting. Preferably, there is a gap 15 between both the pivot ends 18 and the connecting ends 17, so that the gap 15 is distributed circumferentially around the clamped pipe fitting to ensure that the circumferential clamping force of the clamp on the pipe fitting is balanced, which helps to avoid pipe fitting deformation. The gap 15 can be formed by setting a shim or protrusion between the opposing surfaces. When the pipe fitting size is larger than the inner diameter of the clamp, the gap can also be naturally formed between the opposing surfaces by adjusting the position of the locking element in the pivot part or the connecting part.

[0061] Of course, in other embodiments, the gap 15 may be provided only between the opposite faces of adjacent pivot ends 18, or only between the opposite faces of adjacent connecting ends 17.

[0062] like Figure 1 As shown, one of the opposing surfaces of adjacent pivot ends 18 is provided with a protrusion 16. The protrusion 16 is located outside the axis of the cylindrical shaft 21 and can abut against the other opposing surface of the adjacent pivot ends 18. The clearance angle 14 is located outside the protrusion 16. At the same time, one of the opposing surfaces of adjacent connecting ends 17 is provided with a protrusion 16. The protrusion 16 is located on the side of the opposing surface away from the center of the clamp and can abut against the other opposing surface of the adjacent connecting end 17. When the clamp formed by the multiple clamping parts 10 clamps the clamped object, the protrusions 16 on the opposing ends of adjacent clamping parts 10 abut against each other. At the same time, since there is still a gap 15 on the inner side, it can still fill the dimensional error. The abutting protrusions 16 can improve the overall stability of the clamp, thereby improving the clamping stability and force uniformity.

[0063] like Figure 5 As shown, the protrusion 16 protrudes from the opposite surface, and is rectangular in shape. The protrusion 16 at the pivot end 18 is divided into two parts, located on both sides of the protrusion 23. The protrusion 16 at the connecting end 17 is also divided into two parts, located on both sides of the slot 33 at the connecting end 17. Figure 6 As shown, the end face of the clamping part 10 opposite to the protrusion 16 is a plane; however, in other embodiments, a protrusion may be provided on the end face of the clamping part 10 opposite to the protrusion 16 to abut against the protrusion 16, thereby increasing the size of the gap 15 between the opposing surfaces to fill larger dimensional errors.

[0064] In other embodiments, no protrusion 16 is provided on the opposing surfaces of adjacent pivot ends 18, and the gap 15 between the opposing surfaces can be reduced to zero. However, one of the opposing surfaces of adjacent connecting ends 17 is provided with a protrusion 16, which is located on the side of the opposing surface away from the center of the clamp and can abut against the other of the opposing surfaces of adjacent connecting ends 17, thus preserving the adjustment function of the gap 15. Alternatively, no protrusion 16 is provided on the opposing surfaces of adjacent connecting ends 17, and the gap 15 between the opposing surfaces can be reduced to zero. However, one of the opposing surfaces of adjacent pivot ends 18 is provided with a protrusion 16, which is located on the side of the opposing surface away from the center of the clamp and can abut against the other of the opposing surfaces of adjacent pivot ends 18, thus preserving the adjustment function of the gap 15.

[0065] The connecting part 30 can have various structural forms, such as bolt through-hole connection structure, bolt clip connection structure, worm gear drive connection structure and other common clamp connection structures.

[0066] like Figure 7As shown, in this embodiment, the connecting part 30 is rotatably connected to the end of one of the clamping parts 10 and engages and locks with the end of the other clamping part 10. After the clamp is fitted onto the pipe to be clamped, rotating the pivot part 20 and the clamping part 10 causes the clamping part 10 to fit against the outer surface of the pipe to be clamped. At this time, the connecting ends 17 of adjacent clamping parts 10 are close to each other and aligned. Rotating the bolt shaft 31 on one connecting end 17 causes it to engage with the slot 33 on the other connecting end 17, achieving pre-locking. Then, tightening the nut head 32 completes the clamping and fixing. The connecting part 30 is pre-connected to one of the connecting ends 17, eliminating the need for bolts to pass through both connecting ends 17 again. The rotatable engagement method prevents the connecting part 30 from rotating during locking, making operation more convenient and allowing for one-handed operation.

[0067] Specifically, the connecting part 30 includes a bolt shaft 31 and a nut head 32 disposed on the bolt shaft 31. The bolt shaft 31 is rotatably connected to one connecting end 17, and the other connecting end 17 is provided with a groove 33. After rotation, the bolt shaft 31 can be inserted into the groove 33, and then the nut head 32 is used to abut against the connecting end 17 to lock the bolt shaft 31 in the groove 33. The first end of the cylindrical shaft 21 of the pivot part 20 has a thread and is provided with a threaded cap 26 that is threadedly connected to it. The threaded cap 26 abuts against the clamping part 10 to lock the opposite ends of the adjacent clamping parts 10. The position of the threaded cap 26 on the cylindrical shaft 21 is adjustable. After initial contact, it can ensure that the pivot part 20 can rotate freely. By adjusting the position of the threaded cap 26 on the cylindrical shaft 21 again, the distance between the opposite ends of the two clamping parts 10 can be adjusted. Based on the above structure, the contact force between the connecting part 30 and the pivoting part 20 and the clamping part 10 is adjustable, thereby adjusting the clamping force of the entire clamp on the pipe fitting.

[0068] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A clamp, comprising at least two clamping portions, characterized in that, It also includes at least one pivot portion and a connecting portion, the pivot portion being located between adjacent clamping portions, the connecting portion also being located between adjacent clamping portions, and cooperating with the pivot portion to form a closed structure with clamping channels in at least two clamping portions; One of the adjacent clamping portions has a receiving hole at its end. The pivot portion includes a cylindrical shaft. The end of the cylindrical shaft is rotatably connected to the other of the adjacent clamping portions about a first axis. The beginning end of the cylindrical shaft can pass through the receiving hole, so that the clamping portion with the receiving hole can rotate about the first axis relative to the adjacent clamping portion. After the adjacent clamping portions are aligned with each other along the axial direction of the receiving hole, the beginning end of the cylindrical shaft is locked to engage the opposite ends of the adjacent clamping portions. The cylindrical shaft has a second axis perpendicular to the first axis. The pivoting part further includes a first locking part and a second locking part. The first locking part is located at the end of one of the adjacent clamping parts, and the second locking part is located at the end of the other of the adjacent clamping parts. After the first end of the cylindrical shaft passes through the receiving hole, the first locking part and the second locking part can cooperate to restrict the adjacent clamping parts from rotating about the second axis.

2. The clamp as described in claim 1, characterized in that, The first locking part includes a protrusion, and the second locking part includes a groove. The protrusion is fixedly connected to the end of one of the adjacent clamping parts or is an integral structure. The groove is formed at the end of the other of the adjacent clamping parts. The protrusion and the groove are located in the circumference of the cylindrical shaft and can be inserted to restrict the adjacent clamping parts from rotating around the second axis.

3. The clamp as described in claim 2, characterized in that, The protrusion is a non-cylindrical structure, and the groove is a non-cylindrical groove adapted to the protrusion.

4. The clamp as described in claim 2, characterized in that, In the same pivot portion, the protrusion is located at the end of the clamping portion having the receiving hole and extends axially along the receiving hole, and the groove is located at the end of the clamping portion having the cylindrical shaft and extends along the second axis to receive the protrusion when the two clamping portions are mated.

5. The clamp as described in claim 4, characterized in that, The groove is formed by two spaced protrusions at the end of the clamping part, the end of the cylindrical shaft is located between the two protrusions, the end of the cylindrical shaft has a rotating shaft, the rotating shaft extends along the first axis and is connected to the two protrusions; When the protrusion is placed in the groove, it is spaced apart from or tangential to the end of the cylindrical shaft.

6. The clamp as described in any one of claims 1 to 5, characterized in that, The first end of the cylindrical shaft has a thread and is provided with a threaded cap that is threadedly connected to it. The threaded cap abuts against the clamping part to lock the opposite end of the adjacent clamping part.

7. The clamp as described in any one of claims 1 to 5, characterized in that, The end of the clamping part where the pivot is set is defined as the pivot end of the clamping part. The side of the clamping part away from the center of the clamping channel is the outer side. An avoidance angle is provided on the outer side of the opposite face of the two pivot ends. The angle range of the avoidance angle is 60-120°.

8. The clamp as described in any one of claims 1 to 5, characterized in that, The end of the clamping portion provided with the pivot portion is defined as the pivot end of the clamping portion, and the end of the clamping portion provided with the connecting portion is defined as the connecting end of the clamping portion. A gap is provided between the opposing surfaces of adjacent pivot ends, and / or A gap is provided between the opposite surfaces of adjacent connection ends.

9. The clamp as described in claim 8, characterized in that, One of the opposing faces of adjacent pivot ends is provided with a protrusion, the protrusion being located outside the axis of the cylindrical shaft and capable of abutting against the other of the opposing faces of adjacent pivot ends; and / or One of the opposing surfaces of the adjacent connecting ends is provided with a protrusion, the protrusion being located on the side of the opposing surface away from the center of the clamping channel, and being able to abut against the other of the opposing surfaces of the adjacent connecting ends.

10. The clamp as described in any one of claims 1 to 5, characterized in that, The end of the clamping part with the connecting part is defined as the connecting end of the clamping part. The connecting part is rotatably connected to one of the connecting ends and is snapped and locked to the other connecting end.

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