Centering pipe clamp and clamping method

Abstract

The invention relates to the technical field of petroleum pipe equipment, in particular to a centering pipe clamp and a clamping method. According to the centering pipe clamp, the multiple clamping jaw sets are arranged in a staggered mode in the vertical height direction, opening and closing faces are staggered, the interference problem is fundamentally avoided, and therefore pipes with the pipe diameter changing in a large range can be stably clamped. Each clamping jaw set comprises two clamping arms, the vertical face of the middle position of the two clamping arms serves as the center, the motion trails of the two clamping arms are symmetrical about the vertical face, and the characteristic ensures that two clamping points of the two clamping arms in each clamping jaw set are symmetrical. Due to the fact that the vertical faces of the multiple clamping jaw sets are distributed on the at least two different vertical planes and intersect on the same intersecting line, the multiple clamping jaw sets at least can form four clamping points which are symmetrically distributed on the circumference of the pipe and are opposite in pairs. By means of the centering pipe clamp, high-precision stable clamping of pipes with large-range pipe diameter changes is achieved.

Description

Technical Field

[0001] This invention relates to the field of oil pipe fittings and equipment technology, and in particular to a centering pipe clamp and clamping method. Background Art

[0002] In the operation of pipe fittings in the oil industry, clamping the fittings is a crucial step. However, existing pipe clamping tools have significant limitations and cannot adapt to the wide range of pipe diameter variations in the oil industry.

[0003] Traditional clamping tools are often only suitable for pipes within a specific diameter range. When dealing with pipes of different sizes, they often struggle to achieve precise clamping while maintaining stability. Furthermore, traditional clamps often fail to ensure pipe stability and centering accuracy during clamping. Insufficient centering accuracy can lead to pipe deviations during installation, affecting the efficiency and quality of the entire work process, and potentially even causing safety accidents. Simultaneously, most existing clamping methods cannot achieve stable clamping from all directions. Many clamps can only apply force from certain points, potentially resulting in uneven force distribution on the pipe. This uneven force distribution can damage the pipe or cause clamping failure.

[0004] Therefore, there is an urgent need for a high-efficiency clamping tool that can adapt to a wide range of pipe diameter changes and achieve stable centering clamping to meet the ever-evolving needs of industrial production. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a centering pipe clamp, which solves the technical problem that the existing pipe clamps cannot stably clamp pipes with a wide range of diameter variations.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] This invention provides a centering pipe clamp, including a mounting base, a drive mechanism disposed within the mounting base, and multiple sets of gripper assemblies. The multiple sets of gripper assemblies are staggered in vertical height. Each set of gripper assemblies includes two gripping arms, with the two gripping arms in each set centered on a vertical plane at their middle position, and their movement trajectories being symmetrical about the vertical plane. The vertical planes of the multiple sets of gripper assemblies are distributed on at least two different vertical planes, and the vertical planes of the multiple sets of gripper assemblies intersect at the same intersection line. The drive mechanism simultaneously drives the multiple sets of gripper assemblies to close, and the multiple sets of gripper assemblies form at least four points of contact with the pipe perpendicular to its axis on the projection plane, so that the axis of the pipe coincides with the intersection line to form a centering clamp.

[0010] Preferably, the device includes two sets of gripper groups, namely a first gripper group and a second gripper group, which are staggered in vertical height. The first gripper group includes a first clamping arm and a second clamping arm, which are centered on a first vertical plane and their movement trajectories are symmetrical about the first vertical plane. The second gripper group includes a third clamping arm and a fourth clamping arm, which are centered on a second vertical plane and their movement trajectories are symmetrical about the second vertical plane. The first and second vertical planes intersect. The driving mechanism simultaneously drives the first and second gripper groups to close, forming four-point contact between the first and second gripper groups and the pipe for centering and clamping the pipe.

[0011] Preferably, the first clamping arm, the second clamping arm, the third clamping arm, and the fourth clamping arm are arranged alternately in the vertical height.

[0012] Preferably, the first vertical plane and the second vertical plane are symmetrically arranged about the third vertical plane; the first clamping arm and the third clamping arm are centered on the third vertical plane, and their movement trajectories are symmetrical about the third vertical plane; the second clamping arm and the fourth clamping arm are centered on the third vertical plane, and their movement trajectories are symmetrical about the third vertical plane.

[0013] Preferably, the drive mechanism includes a drive member and two sets of linkage assemblies; the drive member is connected to the first gripper group and the second gripper group respectively through the two sets of linkage assemblies; the drive member simultaneously drives the two sets of linkage assemblies to move, so as to drive the first gripper group and the second gripper group to open and close respectively.

[0014] Preferably, the linkage assembly includes a first link, a second link, a third link, and a fourth link; a first end of the first link is rotatably connected to the output end of the drive member, a second end of the first link is rotatably connected to the first end of the second link, and a second end of the second link is rotatably connected to the first ends of the third and fourth links respectively; in one linkage assembly, the second ends of the third and fourth links are rotatably connected to the drive ends of the first and second clamping arms respectively; in another linkage assembly, the second ends of the third and fourth links are rotatably connected to the drive ends of the third and fourth clamping arms respectively. The driving ends of the clamping arms are rotatably connected; the hinged ends of the first, second, third, and fourth clamping arms are all hinged to the mounting base; when the driving member drives the second rod to the first position via the first rod, the third and fourth rods drive the driving ends of the first, second, third, and fourth clamping arms to rotate around the hinged ends to open; when the driving member drives the second rod to the second position via the first rod, the third and fourth rods drive the driving ends of the first, second, third, and fourth clamping arms to rotate around the hinged ends to clamp.

[0015] Preferably, the linkage assembly further includes a first limiting member; the second link moves linearly between a first position and a second position via the first limiting member.

[0016] Preferably, the first limiting member includes a first sliding block and a first fixing block that cooperate with each other. The first fixing block has a first sliding groove, and the first sliding block is slidably connected to the first sliding groove. The first sliding block is disposed on the second rod, and the first fixing block is disposed on the mounting base; or the first sliding block is disposed on the mounting base, and the first fixing block is disposed on the second rod.

[0017] Preferably, the clamping surfaces of the first clamping arm, the second clamping arm, the third clamping arm, and the fourth clamping arm are arc-shaped surfaces; the clamping surfaces of the first clamping arm and the second clamping arm are arranged facing each other; the clamping surfaces of the third clamping arm and the fourth clamping arm are arranged facing each other; the clamping surfaces of the first clamping arm and the third clamping arm are arranged facing each other; the clamping surfaces of the second clamping arm and the fourth clamping arm are arranged facing each other.

[0018] The present invention also provides a clamping method for a centering pipe clamp, wherein the pipe clamp is clamped by means of the above-mentioned centering pipe clamp through the following steps:

[0019] S1. The drive mechanism drives the clamping arms in multiple sets of gripper groups to open simultaneously.

[0020] S2. The centering pipe clamp and the pipe move toward each other;

[0021] S3. The driving mechanism drives the clamping arms in the gripper group to close simultaneously. Multiple gripper groups form at least four points of contact with the pipe perpendicular to the axis on the projection plane so that the axis of the pipe coincides with the intersecting line to form a centering clamp.

[0022] (3) Beneficial effects

[0023] The beneficial effects of the present invention are:

[0024] The centering pipe clamp of this invention employs multiple sets of gripper assemblies arranged in a staggered vertical configuration, ensuring that the opening and closing surfaces are offset from each other, fundamentally avoiding interference problems. Therefore, it can stably clamp pipes with a wide range of diameter variations. Each set of gripper assemblies contains two gripping arms, whose movement trajectories are symmetrical about a central vertical plane. This characteristic ensures the symmetry of the two gripping points of the two gripping arms in each set. Since the vertical planes of the multiple sets of gripper assemblies are distributed on at least two different vertical planes and intersect at the same intersection line, the multiple sets of gripper assemblies can form at least four symmetrically distributed, pairwise gripping points around the circumference of the pipe. Each gripping point can restrict the translational degree of freedom of the pipe in a specific direction, and the four gripping points can restrict a total of four translational degrees of freedom. Simultaneously, based on the symmetry of the four-point distribution, the rotational degree of freedom of the pipe about its axis is also effectively constrained. Through the above structural design, the centering pipe clamp of this invention achieves high-precision and stable clamping of pipes with a wide range of diameter variations.

[0025] The present invention provides a clamping method for a centering pipe clamp, which can achieve clamping of pipes with a wide range of diameter changes and can form at least four points of contact so that the axis of the pipe coincides with the intersecting line to form a centering clamp, ensuring that the pipe is kept in an accurate position. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the centering tube clamp of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the top of the mounting base is not shown in the figure;

[0028] Figure 3 A schematic diagram of the structure for the connection assembly and the first gripper assembly to mate;

[0029] Figure 4 This is a frontal schematic diagram of a centering tube clamp;

[0030] Figure 5 A schematic diagram of the centering principle;

[0031] Figure 6 A schematic diagram of a centering pipe clamp for holding large-diameter pipe fittings;

[0032] Figure 7 A schematic diagram of a centering pipe clamp for holding small-diameter pipes.

[0033] [Explanation of Labels in the Attached Image]

[0034] 1: Drive mechanism; 11: Drive component; 111: Drive body; 112: Connecting block; 12: Link assembly; 121: First link; 122: Second link; 123: Third link; 124: Fourth link; 125: First limiting component; 1251: First sliding block; 1252: First fixing block; 126: Second limiting component; 1261: Second sliding block; 1262: Second fixing block;

[0035] 2: First gripper assembly; 21: First gripping arm; 22: Second gripping arm;

[0036] 3: Second gripper assembly; 31: Third gripper arm; 32: Fourth gripper arm;

[0037] 4: Mounting bracket;

[0038] 5: Pipe fittings;

[0039] A: First vertical plane; B: Second vertical plane; C: Third vertical plane. Detailed Implementation

[0040] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] This embodiment provides a centering pipe clamp, which includes a mounting base 4, a drive mechanism 1, and multiple sets of gripper assemblies. The drive mechanism 1 and the multiple sets of gripper assemblies are both disposed in the mounting base 4. The drive mechanism 1 is used to drive the opening and closing of the multiple sets of gripper assemblies.

[0043] Multiple sets of gripper groups are staggered in the vertical height. The staggered layout of multiple sets of gripper groups in the vertical height makes the opening and closing surfaces staggered, which fundamentally avoids the problem of interference. Therefore, it can stably clamp pipes with a wide range of pipe diameters.

[0044] Each set of grippers includes two gripping arms. The movement trajectories of the two gripping arms in each set are symmetrical about their respective vertical planes, with their respective middle positions as the center. This ensures that the two gripping points of the two gripping arms in each set are symmetrical.

[0045] The vertical surfaces of the multiple gripper sets are distributed on at least two different vertical planes, and the vertical surfaces of the multiple gripper sets intersect at the same intersection line, so that the multiple gripper sets can form at least four symmetrically distributed gripping points on the circumference of the pipe 5, with each pair of gripping points facing each other. Each gripping point can restrict the translational degree of freedom of the pipe 5 in a specific direction, and the four gripping points can restrict a total of four translational degrees of freedom. Based on the symmetry of the four-point distribution, the rotational degree of freedom of the pipe 5 about the axis is also effectively constrained.

[0046] The drive mechanism 1 simultaneously drives multiple sets of gripper groups to close. The multiple sets of gripper groups form at least four points of contact with the tube 5 perpendicular to the axis on the projection plane so that the axis of the tube 5 coincides with the intersecting line to form a centering clamp.

[0047] The design of the multiple gripper groups features a unique geometric layout, such as Figure 5 As shown, each set of grippers corresponds to a vertical plane, and all the vertical planes of the gripper sets intersect at the same line of intersection. For example, the first vertical plane A and the second vertical plane B intersect at this line of intersection. Simultaneously, the two gripping arms within each gripper set have their two gripping points symmetrically distributed about the central plane of the gripper set during operation. This symmetry ensures that when the pipe 5 is gripped, its axis falls precisely on the vertical plane corresponding to each gripper set. Furthermore, because all vertical planes intersect at the same line of intersection, when multiple gripper sets simultaneously perform the gripping action on the pipe 5, the axis of the pipe 5 will inevitably coincide perfectly with this line of intersection. This ingenious design, from a geometrical perspective, ensures the precise positioning and stable gripping of the pipe during the clamping process.

[0048] Through the above structural design, the centering pipe clamp of the present invention achieves high-precision and stable clamping of pipe clamps 5 with a wide range of pipe diameter variations. For example... Figure 6 The diagram shown is a structural schematic of the clamping device 5 for large-diameter pipes. Figure 7 The diagram shown is a structural schematic of clamping small-diameter pipe clamp 5. It should be noted that this centering pipe clamp can clamp pipe clamps with diameters ranging from 70mm to 600mm.

[0049] In practical applications, multiple gripper groups can include two, three, or four groups. When three gripper groups are set, the first, second, and third gripper groups are staggered in vertical height. The vertical surfaces of the first and second gripper groups intersect at an intersection line. The vertical surface of the third gripper group can coincide with or intersect with one of the vertical surfaces of the first and second gripper groups, as long as the vertical surfaces of the three gripper groups are aligned with the same intersection line. Of course, to ensure that the drive mechanism 1 drives the three gripper groups simultaneously, three drive members 11 can be set, with each drive member 11 driving one gripper group independently.

[0050] like Figure 1As shown, to simplify the structure and reduce space occupation, this embodiment includes two sets of gripper assemblies: a first gripper assembly 2 and a second gripper assembly 3, which are staggered vertically. To achieve stable clamping from the side wall of the pipe fitting 5 and to maximize the opening and closing angle of the gripper assemblies, the included angle between the two gripper assemblies in the vertical plane is less than or equal to 90 degrees. In this way, when viewed from above, the opening and closing angle of the two outermost gripping arms can reach its maximum, thus greatly enhancing the adaptability of the gripper assemblies to pipe fittings 5 ​​with different diameters. Stable clamping can be achieved for both small-diameter and large-diameter pipe fittings 5.

[0051] like Figure 2 As shown, the first gripper assembly 2 includes a first gripping arm 21 and a second gripping arm 22. The first gripping arm 21 and the second gripping arm 22 are centered on a first vertical plane A, and their movement trajectories are symmetrical about the first vertical plane A. The second gripper assembly 3 includes a third gripping arm 31 and a fourth gripping arm 32. The third gripping arm 31 and the fourth gripping arm 32 are centered on a second vertical plane B, and their movement trajectories are symmetrical about the second vertical plane B. The first vertical plane A and the second vertical plane B intersect. The driving mechanism 1 simultaneously drives the first gripper assembly 2 and the second gripper assembly 3 to close, forming a four-point contact with the pipe 5 to center and clamp the pipe 5.

[0052] like Figure 2 and 4 As shown, to ensure the stability of the clamping arms in holding the pipe 5, the first clamping arm 21, the second clamping arm 22, the third clamping arm 31, and the fourth clamping arm 32 are arranged alternately in the vertical height to avoid the pipe 5 tipping over due to its excessive length. In this embodiment, to minimize the vertical spacing of the clamping arms within the same jaw group, thereby minimizing the size of the drive mechanism 1, and ensuring the stability of the drive mechanism 1 during the driving process, the clamping arms in the two jaw groups are arranged alternately.

[0053] like Figure 5 As shown, to facilitate the setting of the drive mechanism 1 and simplify its structure, the first vertical plane A and the second vertical plane B are symmetrically arranged about the third vertical plane C. The first clamping arm 21 and the third clamping arm 31 are centered on the third vertical plane C, and their movement trajectories are symmetrical about the third vertical plane. The second clamping arm 22 and the fourth clamping arm 32 are centered on the third vertical plane, and their movement trajectories are symmetrical about the third vertical plane.

[0054] like Figure 2As shown, the drive mechanism 1 includes a drive member 11 and two sets of linkage assemblies 12. The drive member 11 is connected to the first gripper group 2 and the second gripper group 3 respectively through the two sets of linkage assemblies 12. The drive member 11 simultaneously drives the two sets of linkage assemblies 12 to move, thereby driving the first gripper group 2 and the second gripper group 3 to open and close respectively. The first gripper group 2 and the second gripper group 3 are symmetrically arranged along the third vertical plane.

[0055] like Figure 3 , Figure 6 and Figure 7 As shown, the linkage assembly 12 includes a first link 121, a second link 122, a third link 123, and a fourth link 124. The first end of the first link 121 is rotatably connected to the output end of the drive member 11, the second end of the first link 121 is rotatably connected to the first end of the second link 122, and the second end of the second link 122 is rotatably connected to the first ends of the third link 123 and the first ends of the fourth link 124, respectively. In one linkage assembly 12, the second ends of the third link 123 and the fourth link 124 are rotatably connected to the drive ends of the first clamping arm 21 and the second clamping arm 22, respectively. In another linkage assembly 12, the second ends of the third link 123 and the fourth link 124 are rotatably connected to the drive ends of the third clamping arm 31 and the fourth clamping arm 32, respectively.

[0056] In practical applications, the hinged ends of the first clamping arm 21, the second clamping arm 22, the third clamping arm 31, and the fourth clamping arm 32 are all directly hinged to the mounting base 4 via pins or hinged to a hinge seat provided on the mounting base 4 via pins. In this embodiment, the first clamping arm 21 and the third clamping arm 31 are hinged to the mounting base 4 via pins. To avoid interference between multiple vertically arranged pins and other components, the second clamping arm 22 and the third clamping arm 31 are hinged to a hinge seat provided on the mounting base 4.

[0057] When the driving member 11 drives the second member 122 to the first position via the first member 121, the third member 123 and the fourth member 124 in the first linkage assembly 12 drive the driving ends of the first clamping arm 21 and the second clamping arm 22 to rotate in opposite directions around their respective hinge ends to open. At the same time, the third member 123 and the fourth member 124 in the other linkage assembly 12 drive the driving ends of the third clamping arm 31 and the fourth clamping arm 32 to rotate in opposite directions around their respective hinge ends to open. When the driving member 11 drives the second member 122 to the second position via the first member 121, the third member 123 and the fourth member 124 in one linkage assembly 12 drive the driving ends of the first clamping arm 21 and the second clamping arm 22 to rotate towards each other around their respective hinge ends for clamping. At the same time, the third member 123 and the fourth member 124 in another linkage assembly 12 drive the driving ends of the third clamping arm 31 and the fourth clamping arm 32 to rotate towards each other around their respective hinge ends for clamping.

[0058] like Figure 3 and Figure 7 As shown, to ensure the directional movement of the second rod 122 in the first and second positions, the linkage assembly 12 further includes a first limiting member 125. The first limiting member 125 includes a cooperating first sliding block 1251 and a first fixing block 1252. The first fixing block 1252 has a first sliding groove, and the first sliding block 1251 is slidably connected to the first sliding groove. The first sliding block 1251 is disposed on the second rod 122, and the first fixing block 1252 is disposed on the mounting base 4; or the first sliding block 1251 is disposed on the mounting base 4, and the first fixing block 1252 is disposed on the second rod 122. In this embodiment, each linkage assembly 12 includes two first limiting members 125, which are located on the upper and lower sides of the second rod 122, respectively. The first sliding block 1251 is located on the second rod 122, and the first fixing block 1252 is located inside the mounting base 4.

[0059] like Figure 2 and Figure 7As shown, the driving component 11 includes a driving body 111 and a connecting block 112. The fixed end of the driving body 111 is disposed on the mounting base 4, and the connecting block 112 is connected to the driving end of the driving body 111. The connecting block 112 is connected to the first end of the first connecting rod in the two sets of connecting rod assemblies 12. The driving body 111 drives the connecting block 112 to move linearly along the third vertical plane. To ensure the stability of the movement of the connecting block 112, the connecting rod assembly 12 also includes a second limiting member 126. The second limiting member 126 includes a cooperating second sliding block 1261 and a second fixing block 1262. The second fixing block 1262 has a second sliding groove, and the second sliding block 1261 is slidably connected to the second sliding groove. Alternatively, the second sliding block 1261 is disposed on the connecting block 112, and the second fixing block 1262 is disposed on the mounting base 4, or the second sliding block 1261 is disposed on the mounting base 4, and the second fixing block 1262 is disposed on the connecting block 112. In this embodiment, each link assembly 12 includes two second limiting members 126, which are located on the upper and lower sides of the connecting block 112, respectively. The second sliding block 1261 is located on the connecting block, and the second fixing block 1262 is located on the inner side of the mounting base 4.

[0060] To ensure the stability of the clamping arms, the clamping surfaces of the first clamping arm 21, the second clamping arm 22, the third clamping arm 31, and the fourth clamping arm 32 are arc-shaped. The clamping surfaces of the first clamping arm 21 and the second clamping arm 22 face each other, the clamping surfaces of the third clamping arm 31 and the fourth clamping arm 32 face each other, and the clamping surfaces of the first clamping arm 21 and the third clamping arm 31 face each other.

[0061] Example 2

[0062] This embodiment provides a clamping method for a centering pipe clamp. Using the centering pipe clamp from Embodiment 1, the pipe 5 is clamped through the following steps:

[0063] S1, Drive mechanism 1 drives the clamping arms in multiple sets of gripper groups to open simultaneously;

[0064] S2, the centering pipe clamp and pipe 5 move toward each other;

[0065] S3. The driving mechanism 1 drives the clamping arms in the jaw assembly to close simultaneously. Multiple jaw assemblies and the tube 5 form at least four points of contact on the projection plane perpendicular to the axis so that the axis of the tube 5 coincides with the intersecting line to form a centering clamp.

[0066] This embodiment provides a clamping method for a centering pipe clamp, capable of clamping pipes with a wide range of diameter variations and forming at least four points of contact to ensure that the axis of the pipe 5 coincides with the intersecting line, thus forming a centering clamp and ensuring that the pipe 5 maintains an accurate position. In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A centering pipe clamp, characterized in that: It comprises a mounting seat (4), a driving mechanism (1) and a plurality of clamping jaw groups arranged in the mounting seat (4); The plurality of clamping jaw groups are staggered in vertical height; Each group of the clamping jaws comprises two clamping arms, and the two clamping arms in each group of the clamping jaws are centered on a vertical plane at a middle position thereof, and the movement trajectories of the two clamping arms are symmetrical about the vertical plane; The vertical surfaces of the plurality of clamping jaw groups are distributed on at least two different vertical planes, and the vertical surfaces of the plurality of clamping jaw groups intersect at the same intersection line; The driving mechanism drives the multiple groups of the clamping jaws to close simultaneously, and the multiple groups of the clamping jaws form at least four points of contact with the pipe (5) perpendicular to the axis on the projection surface so that the axis of the pipe (5) coincides with the intersection line to form a centering clamp.

2. The centering pipe clamp according to claim 1, characterized in that: The invention comprises two groups of clamping jaws, wherein the two groups of clamping jaws are a first clamping jaw group (2) and a second clamping jaw group (3), and the first clamping jaw group (2) and the second clamping jaw group (3) are arranged alternately in vertical height; The first clamping jaw group (2) comprises a first clamping arm (21) and a second clamping arm (22), the first clamping arm (21) and the second clamping arm (22) are centered on a first vertical plane (A), and their movement trajectories are symmetrical about the first vertical plane (A); The second clamping jaw group (3) comprises a third clamping arm (31) and a fourth clamping arm (32), the third clamping arm (31) and the fourth clamping arm (32) are centered on the second vertical plane (B), and their movement trajectories are symmetrical about the second vertical plane (B), and the first vertical plane (A) and the second vertical plane (B) intersect; The driving mechanism (1) simultaneously drives the first clamping jaw group (2) and the second clamping jaw group (3) to close, so that the first clamping jaw group (2) and the second clamping jaw group (3) form four-point contact with the pipe fixture (5) to perform centering clamping on the pipe fixture (5).

3. The centering pipe clamp according to claim 2, characterized in that: The first clamping arm (21), the second clamping arm (22), the third clamping arm (31) and the fourth clamping arm (32) are arranged alternately in vertical height.

4. The centering pipe clamp according to claim 2, characterized in that: The first vertical plane (A) and the second vertical plane (B) are symmetrically arranged with respect to the third vertical plane (C); The first clamping arm (21) and the third clamping arm (31) are centered on the third vertical plane (C), and their movement trajectories are symmetrical about the third vertical plane (C); The second clamping arm (22) and the fourth clamping arm (32) are centered on the third vertical plane (C), and their movement trajectories are symmetrical about the third vertical plane (C).

5. The centering pipe clamp according to claim 4, characterized in that: The driving mechanism (1) comprises a driving member (11) and two groups of connecting rod assemblies (12); The driving member (11) is respectively connected to the first clamping jaw group (2) and the second clamping jaw group (3) via two groups of connecting rod assemblies (12); The driving member (11) drives the two groups of connecting rod assemblies (12) to move simultaneously, so as to respectively drive the first clamping jaw group (2) and the second clamping jaw group (3) to open and close.

6. The centering pipe clamp according to claim 5, characterized in that: The connecting rod assembly (12) comprises a first rod (121), a second rod (122), a third rod (123) and a fourth rod (124); The first end of the first rod (121) is rotatably connected to the output end of the driving member (11), the second end of the first rod (121) is rotatably connected to the first end of the second rod (122), and the second end of the second rod (122) is rotatably connected to the first end of the third rod (123) and the first end of the fourth rod (124); A second end of the third rod (123) and a second end of the fourth rod (124) in the connecting rod assembly (12) are rotatably connected to a driving end of the first clamping arm (21) and a driving end of the second clamping arm (22) respectively; The second end of the third rod (123) and the second end of the fourth rod (124) in the other connecting rod assembly (12) are rotatably connected to the driving end of the third clamping arm (31) and the driving end of the fourth clamping arm (32) respectively; The hinged ends of the first clamping arm (21), the second clamping arm (22), the third clamping arm (31) and the fourth clamping arm (32) are all hinged to the mounting seat (4); When the driving member (11) drives the second rod (122) to be located at the first position via the first rod (121), the third rod (123) and the fourth rod (124) drive the driving ends of the first clamping arm (21), the second clamping arm (22), the third clamping arm (31) and the fourth clamping arm (32) to rotate around the hinge end to open; When the driving member (11) drives the second rod (122) to be located at the second position via the first rod (121), the third rod (123) and the fourth rod (124) drive the driving ends of the first clamping arm (21), the second clamping arm (22), the third clamping arm (31) and the fourth clamping arm (32) to rotate around the hinge end for clamping.

7. The centering pipe clamp according to claim 6, characterized in that: The connecting rod assembly (12) further includes a first limiting member (125); The second rod (122) moves linearly between the first position and the second position via the first limiting member (125).

8. The centering pipe clamp according to claim 7, characterized in that: The first limiting member (125) comprises a first sliding block (1251) and a first fixed block (1252) that cooperate with each other, the first fixed block (1252) is provided with a first sliding groove, and the first sliding block (1251) is slidably connected to the first sliding groove; The first sliding block (1251) is arranged on the second rod (122), and the first fixing block (1252) is arranged on the mounting seat (4); Or the first sliding block (1251) is arranged on the mounting seat (4), and the first fixing block (1252) is arranged on the second rod (122).

9. The centering pipe clamp according to claim 2, characterized in that: The clamping surfaces of the first clamping arm (21), the second clamping arm (22), the third clamping arm (31) and the fourth clamping arm (32) are arc-shaped surfaces; The clamping surfaces of the first clamping arm (21) and the second clamping arm (22) are arranged facing each other; The clamping surfaces of the third clamping arm (31) and the fourth clamping arm (32) are arranged facing each other; The clamping surfaces of the first clamping arm (21) and the third clamping arm (31) are arranged facing each other; The clamping surfaces of the second clamping arm (22) and the fourth clamping arm (32) are arranged facing each other.

10. A method for clamping a centering pipe clamp, characterized in that: Using the centering pipe clamp according to any one of claims 1 to 9, the pipe (5) is clamped by the following steps: S1, the driving mechanism (1) drives the clamping arms in the plurality of clamping jaw groups to open simultaneously; S2, the centering pipe fixture clamp and the pipe fixture (5) move towards each other; S3. The driving mechanism (1) drives the clamping arms in the clamping jaw group to close simultaneously, and the multiple clamping jaw groups form at least four points of contact with the pipe fixture (5) perpendicular to the axis on the projection surface so that the axis of the pipe fixture (5) coincides with the intersection line to form a centering clamp.

Images