A clamping device for a pipe cutting machine

Abstract

The utility model relates to pipe fixing technology field especially, more particularly to a kind of clamping device for pipe cutting machine.For the clamping device of cutting machine, including support mechanism and at least two groups of clamping device that can simultaneously clamp same pipe by being oppositely spaced installation in support mechanism, cutting station for setting cutting knife is formed between adjacent two groups of clamping device.Each group of clamping device includes connecting rod mechanism, clamping component and drive component, and clamping component includes multiple clamping ends.The output end of drive component is rotatably connected with one or more connecting rods in connecting rod mechanism, and multiple connecting rods of connecting rod mechanism are fixedly connected with multiple clamping ends of clamping component, and drive component is used to drive the bidirectional movement of connecting rod mechanism, to drive the clamping end of clamping component to be close to each other or away from each other to clamp or release pipe.By the linkage design of clamping device, it makes that clamping action is efficient, synchronous and stable, can be adapted to multiple pipe diameter, need not to replace clamp, improves the concentricity and stability of clamping.

Description

Technical Field

[0001] This utility model relates to the field of pipe fixing technology, and in particular to a clamping device for a pipe cutting machine. Background Technology

[0002] In the continuous production of polyolefin plastic pipes such as polyvinyl chloride (PVC) and polyethylene (PE), after extrusion, cooling, and sizing, the pipes need to be precisely cut to a specific length, and the ends are usually chamfered simultaneously to meet the requirements of subsequent connection and installation. To ensure cutting accuracy and chamfering quality, the pipes must be reliably clamped by clamping devices during the cutting and chamfering processes to prevent axial movement, radial offset, and rotational vibration.

[0003] Currently, the half-block clamping structure (also known as a clamping clamp) consists of two semi-circular or arc-shaped clamping blocks that encircle and clamp the pipe. This structure provides high clamping stability, but each set of half-blocks is only suitable for a specific pipe diameter range. When the production line needs to switch to different pipe specifications, the machine must be stopped and the corresponding size clamps must be replaced manually, which is cumbersome and affects production efficiency.

[0004] To address the issue of low changeover efficiency, a universal clamping mechanism was introduced into the cutting machine's clamping system. This mechanism utilizes the universal contact surface to automatically adapt to different pipe diameters, eliminating the need to change clamps. However, several technical shortcomings remain in practical applications: existing planar universal clamps have a large contact area but poor fit, leading to pipe eccentricity during clamping and the clamping center deviating from the pipe's geometric axis, affecting the perpendicularity of the cut surface; uneven clamping force distribution can damage the pipe surface and cause slippage during cutting; structural limitations result in weak axial constraint on the pipe, insufficient clamping stability, and inconsistent pipe cutting dimensions; vibration is difficult to effectively suppress during high-speed cutting and chamfering, leading to a short service life of the clamping device. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a clamping device for a pipe cutting machine, which solves the technical problems of frequent replacement of traditional half block clamps, low production change efficiency, poor concentricity and instability of existing planar universal clamping mechanisms, which easily lead to inconsistent cutting dimensions and short equipment life.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a clamping device for a pipe cutting machine, including a support mechanism and at least two sets of clamping devices that are installed at relatively intervals on the support mechanism and are capable of simultaneously clamping the same pipe. A cutting station for setting a cutting blade is formed between two adjacent sets of clamping devices. Each set of clamping devices includes a linkage mechanism, a clamping assembly, and a driving assembly. The clamping assembly includes multiple clamping ends. The output end of the driving assembly is rotatably connected to one or more links in the linkage mechanism. Multiple links of the linkage mechanism are fixedly connected to multiple clamping ends of the clamping assembly. The driving assembly is used to drive the linkage mechanism to move in both directions, so as to move the clamping ends of the clamping assembly closer or further away from each other to clamp or release the pipe.

[0010] Preferably, the linkage mechanism includes a plurality of first links and a plurality of second links. The plurality of first links are circumferentially spaced along the same circumferential direction and their inner ends are fixedly connected to the plurality of clamping ends. Adjacent first links are rotatably connected to each other through second links. Each first link is rotatably connected to the support mechanism at a position between its connection position with the clamping end and the second link. The driving assembly includes at least one driving cylinder. The cylinder body of the driving cylinder is fixedly connected to the support mechanism, and its piston rod end is rotatably connected to the first link. The position where the first link connects to the driving cylinder is located outside the position where it connects to the second link. The driving cylinder drives the first link connected to it to rotate clockwise or counterclockwise. The translational motion of the second link drives the remaining first links to rotate clockwise or counterclockwise synchronously, thereby causing the plurality of clamping ends to move closer or further away from each other to clamp or release the pipe.

[0011] Preferably, the number of first connecting rods is 4-8, wherein at least one first connecting rod is rotatably connected to the drive cylinder as an active connecting rod, and the remaining first connecting rods are driven connecting rods. The number of second connecting rods is the same as the number of first connecting rods. The multiple driven connecting rods are evenly distributed circumferentially, and each first connecting rod is rotatably connected to the second connecting rod in sequence, together forming a closed transmission ring structure.

[0012] Preferably, the drive assembly includes two drive cylinders symmetrically arranged about the central axis of the clamping device; the linkage mechanism has a total of six first linkages and six second linkages, of which two are the driving linkages and the other four first linkages are the driven linkages; the two driving linkages are symmetrically arranged about the central axis of the clamping device, and the four driven linkages are evenly distributed circumferentially, and are rotatably connected to the two driving linkages through the six second linkages.

[0013] Preferably, the clamping end of the clamping assembly is a plurality of circumferentially distributed clamping rollers. One end of the clamping roller is connected to the first connecting rod, and the other end extends radially inward and into the support mechanism. The side of the clamping roller facing the center is an arc surface for tangential contact with the outer circumferential surface of the pipe. The clamping rollers of the two sets of clamping devices are arranged opposite to each other, and a cutting station for setting the cutting blade is formed between the oppositely arranged clamping rollers.

[0014] Preferably, the surface of the clamping roller that contacts the tube has a texture to increase friction or is covered with a layer of elastic material.

[0015] Preferably, it also includes multiple support shafts; each of the first connecting rods is rotatably connected to the support mechanism through a corresponding support shaft; the support mechanism is provided with multiple mounting slots, and one end of each of the multiple support shafts is fixedly installed in the mounting slot.

[0016] Preferably, it further includes two fixing rings; the two fixing rings are rotatably connected to the ends of the two linkage mechanisms away from the support mechanism.

[0017] Preferably, the support mechanism includes two oppositely arranged mounting plates and a plurality of connecting columns connecting the two; two sets of clamping devices are respectively mounted on the two mounting plates.

[0018] Preferably, the clamping device is capable of clamping plastic or metal pipes with an outer diameter of 40mm-630mm.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this utility model are:

[0021] This utility model discloses a clamping device for a pipe cutting machine. The clamping device includes a support mechanism and at least two sets of clamping devices. The two sets of clamping devices are arranged at relative intervals, and a cutting station is formed between the two sets of clamping devices, which realizes stable clamping of the pipe at two points, significantly improving the flatness of the cutting end face and the processing accuracy.

[0022] Through the coordinated design of the drive assembly, linkage mechanism, and clamping assembly, the clamping action is highly efficient, synchronous, and stable. Compared to the low changeover efficiency of traditional half-block clamps, this invention achieves adaptive clamping of pipes of different diameters via the linkage mechanism, eliminating the need to change clamps during changeovers and reducing changeover time from the traditional 30 minutes to less than 1 minute. Addressing the concentricity issues of existing planar universal clamping mechanisms, this invention employs dual-point clamping of the drive assembly and clamping assembly, ensuring a coaxiality error ≤0.1mm, meeting high-precision cutting requirements, and a cutting end face perpendicularity error ≤0.05mm / m. This improves clamping concentricity and stability, ensuring accurate pipe positioning and reliable clamping during cutting and chamfering processes, and effectively guaranteeing dimensional consistency during cutting and chamfering, thereby reducing processing errors and improving production efficiency and finished product quality. Simultaneously, it ensures that the clamping force is evenly applied to the outer circumference of the pipe, avoiding surface damage or roundness deformation caused by excessive local stress, making it particularly suitable for processing thin-walled pipes or pipes with high surface quality requirements. The clamping assembly increases the clamping length of the clamping device, effectively suppressing the vibration and displacement of the pipe during the cutting process and extending the service life of the equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a clamping device for a pipe cutting machine according to the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the clamping device;

[0025] Figure 3 A schematic diagram of the overall structure of the clamping device from another perspective;

[0026] Figure 4 A schematic diagram of the overall mechanism when the clamping device clamps the pipe;

[0027] Figure 5 This is a front view schematic diagram of the driven link;

[0028] Figure 6 This is a partial cross-sectional schematic diagram of the driven link.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Support mechanism; 11: Mounting plate; 12: Connecting column;

[0031] 2: Clamping device; 21: Linkage mechanism; 211: Driving link; 212: Driven link; 2121: Driven plate; 21211: First rotating shaft mounting hole; 21212: Support shaft mounting hole; 2122: Connecting plate; 2123: Fixing pin; 213: Second link; 214: First rotating shaft; 215: Second rotating shaft; 22: Clamping assembly; 221: Clamping roller; 23: Drive assembly; 231: Drive cylinder; 232: Support base;

[0032] 3: Support shaft;

[0033] 4: Fixing ring;

[0034] a: Pipes. Detailed Implementation

[0035] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0037] Example

[0038] like Figure 1 As shown, this embodiment provides a clamping device for a pipe cutting machine. The clamping device includes a support mechanism 1 and two sets of clamping devices 2. The two sets of clamping devices 2 are installed on the support mechanism 1 at a distance from each other, and are spaced apart along the axial direction of the pipe a, thus enabling simultaneous clamping of the same pipe a. A cutting station for setting the cutting blade is formed between two adjacent sets of clamping devices 2. By using two sets of clamping devices 2 arranged at a distance from each other, and by forming a cutting station between the two sets of clamping devices 2, stable dual-point clamping of the pipe a is achieved, significantly improving the flatness and processing accuracy of the cut end face.

[0039] It should be noted that the number of clamping devices 2 can also be two or more. For example, if there are three sets of clamping devices 2, a cutting station can be set between two of them.

[0040] To provide a stable and reliable mounting base for the two sets of clamping devices 2, such as Figure 1As shown, the support mechanism 1 includes two opposing mounting plates 11 and multiple connecting columns 12 connecting the two. Each mounting plate 11 has a material hole at its center, and two sets of clamping devices 2 are respectively mounted on the two mounting plates 11. The two mounting plates 11 and the multiple connecting columns 12 together form a robust frame, effectively resisting vibrations and impacts generated during the cutting process and ensuring the stability of the clamping and cutting process. The cutting blade (not shown) is located in the interval area between the two mounting plates 11 and within the space enclosed by adjacent connecting columns 12. The cutting plane of the cutting blade is perpendicular to the axis of the pipe a, and its cutting path completely avoids the movement range of all connecting columns 12 and clamping devices 2.

[0041] Among them, the material holes on the two mounting plates 11 are processed simultaneously through precision positioning, which can ensure extremely high coaxiality, thereby ensuring the straightness of the pipe a during insertion, clamping and cutting, and improving the processing accuracy.

[0042] like Figure 1 As shown, each clamping device 2 includes a linkage mechanism 21, a clamping assembly 22, and a drive assembly 23. The clamping assembly 22 includes multiple clamping ends. The output end of the drive assembly 23 is rotatably connected to one or more links in the linkage mechanism 21. The multiple links of the linkage mechanism 21 are correspondingly and fixedly connected to the multiple clamping ends of the clamping assembly 22. The drive assembly 23 is used to drive the linkage mechanism 21 to move in both directions, so as to drive the clamping ends of the clamping assembly 22 to move closer or further away from each other to clamp or release the pipe a. Through the linkage design of the drive assembly 23, the linkage mechanism 21, and the clamping assembly 22, the clamping action is efficient, synchronous, and stable. Compared with the low production change efficiency of traditional half-block clamps, this utility model achieves adaptive clamping of pipes a of different diameters through the linkage mechanism 21. There is no need to change the clamp during production change, and the production change time is shortened from the traditional 30 minutes to less than 1 minute. Compared to the existing planar universal clamping mechanisms that suffer from poor concentricity, this invention employs a dual-point clamping system consisting of a drive assembly 23 and a clamping assembly 22. This ensures a coaxiality error of ≤0.1mm, meeting the requirements for high-precision cutting, and a perpendicularity error of ≤0.05mm / m at the cut end face. This improves the concentricity and stability of the clamping, ensuring accurate positioning and reliable clamping of the pipe a during cutting and chamfering processes. Furthermore, it effectively guarantees dimensional consistency during cutting and chamfering, thereby reducing processing errors and improving production efficiency and finished product quality. Simultaneously, it ensures that the clamping force is evenly applied to the outer circumference of the pipe a, avoiding surface damage or roundness deformation caused by excessive local stress. This design is particularly suitable for processing thin-walled pipes or pipes requiring high surface quality.

[0043] Furthermore, such as Figure 2 and Figure 3As shown, the linkage mechanism 21 includes multiple first links and multiple second links 213. The multiple first links are circumferentially spaced along the same circumferential direction, and their inner ends are fixedly connected to multiple clamping ends. Adjacent first links are rotatably connected to each other via second links 213. At least one of the multiple first links is rotatably connected to the output end of the drive assembly 23. Each first link is rotatably connected to the support mechanism 1 at a position between its connection point with the clamping end and the second link 213. The first link forms a revolute pair with the support mechanism 1 at a specific position. The inner end of the first link, i.e., the connection point with the clamping end, can generate a precise motion trajectory, thereby directly driving the clamping end to smoothly move radially closer to or away from the pipe a, ensuring the stability and reliability of the clamping process. Furthermore, the linkage mechanism 21 can effectively distribute the force generated by the drive assembly 23 to multiple clamping ends, making the entire clamping device 2 have strong load-bearing capacity, good rigidity, and providing a powerful and stable clamping force.

[0044] Furthermore, the first link and the second link 213 are rotatably connected via the first rotating shaft 214, and the first link and the drive assembly 23 are rotatably connected via the second rotating shaft 215.

[0045] like Figure 4 As shown, the drive assembly 23 drives the first link connected to it to rotate clockwise or counterclockwise, and the translation of the second link 213 drives the other first links to rotate clockwise or counterclockwise synchronously, thereby causing multiple clamping ends to move closer or further apart to clamp or release the pipe a.

[0046] Specifically, the drive assembly 23 includes at least one drive cylinder 231. The cylinder body of the drive cylinder 231 is fixedly connected to the support mechanism 1, and the end of its piston rod is rotatably connected to the first connecting rod. The position where the first connecting rod connects to the drive cylinder 231 is located outside the position where it connects to the second connecting rod 213.

[0047] like Figure 2 and Figure 3 As shown, the drive assembly 23 also includes a support base 232, and the cylinder body of the drive cylinder 231 is fixedly connected to the support mechanism 1 through the support base 232.

[0048] Preferably, there are 4-8 first connecting rods, at least one of which is rotatably connected to the drive cylinder 231 as the driving connecting rod 211, and the remaining first connecting rods are driven connecting rods 212. The number of second connecting rods 213 is the same as the number of first connecting rods. The multiple driven connecting rods 212 are evenly distributed circumferentially, and each first connecting rod is rotatably connected to the second connecting rod 213 in sequence, together forming a closed transmission ring structure.

[0049] In a preferred embodiment of this utility model, the drive assembly 23 includes two drive cylinders 231 symmetrically arranged about the central axis of the clamping device 2. The linkage mechanism 21 has six first links and six second links 213, two of which are active links 211 and the other four are driven links 212. Specifically, the two active links 211 are symmetrically arranged about the central axis of the clamping device 2, and the four driven links 212 are evenly distributed circumferentially and are rotatably connected to the two active links 211 through the six second links 213. The two drive cylinders 231 drive the two active links 211 to rotate, which allows the motion and power to be synchronously transmitted to all other driven links 212 on the circumference through the second links 213. This ensures that all clamping ends can perform clamping or releasing actions simultaneously and synchronously, and the clamping force is evenly distributed, avoiding possible displacement or deformation of the pipe a due to unilateral or asynchronous clamping.

[0050] like Figure 5 and Figure 6 As shown, the driven link 212 includes two parallel driven plates 2121, multiple connecting plates 2122 connecting the two driven plates 2121, and a fixing pin 2123. The fixing pin 2123 is located at one end of the driven plate 2121 near the clamping assembly 22 and is used to connect to the clamping assembly 22. The multiple connecting plates 2122 ensure that the clamping device 2121 will not deform due to the torque transmitted on the clamping end during clamping. The driven plate 2121 has two first rotating shaft mounting holes 21211, through which the first rotating shaft 214 passes to be rotatably connected to the second link 213. It also incorporates a high-efficiency self-lubricating bearing to reduce friction and wear, improve the overall smoothness of operation and service life, and enhance the linkage response speed of the clamping device 2.

[0051] The difference between the active link 211 and the driven link 212 is that the length of the active plate of the active link 211 is greater than the length of the driven plate 2121 of the driven link 212. In addition, a second rotating shaft mounting hole is provided at the end of the active plate away from the clamping assembly 22. Two first rotating shaft mounting holes 21211 are provided between the second rotating shaft mounting hole and the fixing pin 2123. The second rotating shaft 215 passes through the second rotating shaft mounting hole to be rotatably connected to the output end of the drive cylinder 231.

[0052] It should be noted that the shapes of the driving link 211 and the driven link 212 are precisely designed to ensure that they do not interfere with each other during operation. Due to the symmetry of the linkage mechanism 21, even with pipes a of different diameters, the angle and position of the clamping end can be automatically adjusted to ensure balanced clamping force.

[0053] like Figure 2 and Figure 3As shown, the clamping assembly 22 has multiple clamping ends consisting of multiple circumferentially distributed clamping rollers 221. One end of each clamping roller 221 is connected to the first connecting rod, and the other end extends radially inward and into the support mechanism 1. The side of the clamping roller 221 facing the center is an arc surface for tangential contact with the outer circumferential surface of the pipe a. The clamping rollers 221 of the two sets of clamping devices 2 are arranged opposite to each other, forming a cutting station for setting the cutting blade between the oppositely arranged clamping rollers 221. The oppositely arranged clamping rollers 221 increase the clamping length of the clamping device 2, effectively suppressing the vibration and displacement of the pipe a during the cutting process and extending the service life of the equipment.

[0054] Preferably, the clamping roller 221 is cylindrical. The clamping roller 221 forms multiple evenly distributed contacts with the outer wall of the tube a, resulting in a small contact area and concentrated clamping force.

[0055] Preferably, the surface of the clamping roller 221 that contacts the tube a has a textured surface to increase friction or is covered with an elastic material layer. The surface texture or elastic material layer effectively increases the coefficient of friction between the clamping roller 221 and the surface of the tube a, preventing slippage or relative displacement between the tube a and the clamping roller 221 during cutting, ensuring clamping stability and processing safety. The elastic material layer, such as rubber or polyurethane, can deform moderately during clamping, buffering local pressure and thus evenly distributing the clamping force, effectively preventing damage such as indentations and scratches on the surface of the tube a, and ensuring the quality of the finished product.

[0056] like Figure 4 As shown, it also includes multiple support shafts 3, and the first connecting rod is rotatably connected to the support mechanism 1 through the corresponding support shaft 3. Multiple mounting slots (not shown in the figure) are provided on the mounting plate 11 of the support mechanism 1, and one end of each support shaft 3 is fixedly installed in the mounting slot. At the connection between the support shaft 3 and the mounting plate 11, an enlarged mounting slot is designed to ensure the stable concentricity of the support shaft 3 and the final clamping effect of the clamping device during long-term use.

[0057] Furthermore, such as Figure 5 and Figure 6 As shown, each first link has a support shaft mounting hole 21212, and the support shaft 3 passes through the support shaft mounting hole 21212 and is rotatably connected to the first link.

[0058] Preferably, the support shaft 3 is made of high-strength alloy steel, which improves the overall strength and fatigue resistance of the support shaft 3 and ensures structural stability during frequent clamping operations. The dimensional accuracy of each support shaft 3 is controlled within ±0.02mm to ensure the synchronicity of the linkage between the first connecting rod and the second connecting rod 213.

[0059] like Figure 2As shown, it also includes two fixing rings 4, which are rotatably connected to the ends of the two linkage mechanisms 21 away from the support mechanism 1. The fixing rings 4 provide an external common constraint and support point for the multiple circumferentially distributed first linkages, connecting the ends of the first linkages that might otherwise move independently into a whole, significantly improving the structural rigidity and stability of the entire linkage mechanism 21, effectively suppressing the deformation and vibration generated when it is under force, and ensuring the accuracy and reliability of the clamping action.

[0060] Preferably, the clamping device of this embodiment can clamp plastic or metal pipes a with an outer diameter of 40mm-630mm. When changing to pipes a with different outer diameters, the drive cylinder 231 can adapt its stroke to achieve a suitable extension length and achieve the same clamping effect.

[0061] When pipe a needs to be cut, the drive cylinder 231 is first started, which pushes the active connecting rod 211 to rotate. The second connecting rod 213 transmits the motion and power to the other driven connecting rods 212, causing the driven connecting rods 212 to rotate, so that the clamping rollers 221 tighten along the radial direction of pipe a. Then the cutting blade cuts pipe a. Finally, the drive cylinder 231 moves in the opposite direction, and each clamping roller 221 opens to release pipe a.

[0062] In the description of this utility model, 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0064] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" 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," and "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.

[0065] 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.

[0066] 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 clamping device for a pipe cutting machine, characterized in that, It includes a support mechanism (1) and at least two sets of clamping devices (2) installed at relatively intervals on the support mechanism (1) that are capable of simultaneously clamping the same pipe (a), wherein a cutting station for setting a cutting blade is formed between two adjacent sets of clamping devices (2); Each clamping device (2) includes a linkage mechanism (21), a clamping assembly (22), and a drive assembly (23), wherein the clamping assembly (22) includes multiple clamping ends; The output end of the drive assembly (23) is rotatably connected to one or more links in the linkage mechanism (21). The multiple links of the linkage mechanism (21) are fixedly connected to the multiple clamping ends of the clamping assembly (22). The drive assembly (23) is used to drive the linkage mechanism (21) to move in both directions, so as to drive the clamping ends of the clamping assembly (22) to move closer or further away from each other to clamp or release the pipe (a).

2. The clamping device for a pipe cutting machine as described in claim 1, characterized in that: The linkage mechanism (21) includes a plurality of first links and a plurality of second links (213). The plurality of first links are circumferentially spaced along the same circumferential direction and their inner ends are fixedly connected to the plurality of clamping ends. Adjacent first links are rotatably connected to each other through the second links (213). The first links are rotatably connected to the support mechanism (1) at a position between their connection position with the clamping end and the second link (213). The drive assembly (23) includes at least one drive cylinder (231), the cylinder body of the drive cylinder (231) is fixedly connected to the support mechanism (1), the piston rod end of the drive cylinder (231) is rotatably connected to the first connecting rod, and the position of the first connecting rod connected to the drive cylinder (231) is outside the position of the first connecting rod connected to the second connecting rod (213). The drive cylinder (231) drives the first connecting rod connected to it to rotate clockwise or counterclockwise, and through the translation of the second connecting rod (213), drives the remaining first connecting rods to rotate clockwise or counterclockwise synchronously, thereby causing the plurality of clamping ends to move closer or further away from each other to clamp or release the pipe (a).

3. The clamping device for a pipe cutting machine as described in claim 2, characterized in that: The number of the first connecting rods is 4-8, of which at least one first connecting rod is rotatably connected to the drive cylinder (231) as the active connecting rod (211), and the remaining first connecting rods are driven connecting rods (212). The number of the second connecting rods (213) is the same as the number of the first connecting rods. Multiple driven links (212) are evenly distributed circumferentially, and each first link is rotatably connected through a second link (213) in sequence, together forming a closed transmission ring structure.

4. The clamping device for a pipe cutting machine as described in claim 3, characterized in that: The drive assembly (23) includes two drive cylinders (231) symmetrically arranged about the central axis of the clamping device (2); The linkage mechanism (21) is provided with a total of six first links and six second links (213), two of which are the active links (211) and the other four first links are the driven links (212); The two active links (211) are symmetrically arranged about the central axis of the clamping device (2), and the four driven links (212) are evenly distributed circumferentially and are rotatably connected to the two active links (211) through six second links (213).

5. The clamping device for a pipe cutting machine as described in claim 2, characterized in that: The clamping end of the clamping assembly (22) is a plurality of circumferentially distributed clamping rollers (221). One end of the clamping roller (221) is connected to the first connecting rod, and the other end extends radially inward and into the support mechanism (1). The side of the clamping roller (221) facing the center is an arc surface for tangential contact with the outer peripheral surface of the tube (a). The clamping rollers (221) of the two sets of clamping devices (2) are arranged opposite to each other, and a cutting station for setting the cutting blade is formed between the clamping rollers (221) arranged opposite to each other.

6. The clamping device for a pipe cutting machine as described in claim 5, characterized in that: The surface of the clamping roller (221) that contacts the tube (a) is textured to increase friction or covered with a layer of elastic material.

7. The clamping device for a pipe cutting machine as described in claim 2, characterized in that: It also includes multiple support shafts (3); The first connecting rods are all rotatably connected to the support mechanism (1) through corresponding support shafts (3); The support mechanism (1) has multiple mounting slots, and one end of each of the multiple support shafts (3) is fixedly installed in the mounting slot.

8. The clamping device for a pipe cutting machine as described in claim 1, characterized in that: It also includes two fixing rings (4); The two fixed rings (4) are rotatably connected to the ends of the two linkage mechanisms (21) away from the support mechanism (1).

9. The clamping device for a pipe cutting machine as described in claim 1, characterized in that: The support mechanism (1) includes two mounting plates (11) arranged opposite to each other and a plurality of connecting columns (12) connecting the two; The two sets of clamping devices (2) are respectively mounted on the two mounting plates (11).

10. The clamping device for a pipe cutting machine as described in any one of claims 1-9, characterized in that: The clamping device is capable of clamping plastic or metal pipes with an outer diameter of 40mm-630mm (a).

Images