Positioning device for pipe cutting

Abstract

The utility model discloses a pipe cutting positioning device which comprises a base, a clamping mechanism, a limiting mechanism and a pipe cutting mechanism, the base comprises a mounting table and a truss assembly fixedly connected to the mounting table, and the mounting table is provided with a conveying path suitable for conveying workpieces in the workpiece conveying direction; the clamping mechanism is installed on the base, a clamping hole in the conveying path is formed in the clamping mechanism, and the clamping mechanism is suitable for clamping a workpiece penetrating through the clamping hole; the limiting mechanism is mounted on the mounting table, and a V-shaped supporting assembly is arranged on the limiting mechanism; the pipe cutting mechanism is installed on the truss assembly and located between the clamping mechanism and the limiting mechanism, and the pipe cutting mechanism is suitable for cutting the workpieces on the conveying path. The V-shaped supporting assembly comprises a base assembly and a pair of sliding cushion block sets. The support can be conveniently maintained and replaced, the service life is prolonged, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to a positioning device for pipe cutting, belonging to the technical field of positioning devices. Background Art

[0002] At present, with the continuous development of industrial production technology and the increasing requirements for pipe cutting accuracy, the market demand for positioning devices for pipe cutting is also increasing.

[0003] After searching the prior art, we discovered Chinese Patent Publication No. CN220943416U, which discloses a positioning device for a pipe cutting machine. This patented positioning device secures the workpiece by clamping it. However, during use, it was discovered that because the other end of the workpiece is supported by a plate, the plate easily wears over time, resulting in a decrease in positioning accuracy. This necessitates frequent replacement and maintenance, increasing operating costs and downtime. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a positioning device for pipe cutting, which can facilitate maintenance and replacement of supports, extend service life and reduce use costs.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a positioning device for pipe cutting, comprising:

[0006] A base, the base comprising a mounting platform and a truss assembly fixedly connected to the mounting platform, the mounting platform being provided with a conveying path suitable for conveying the workpiece along a workpiece conveying direction;

[0007] a clamping mechanism, the clamping mechanism being mounted on the base, the clamping mechanism being provided with a clamping hole on the conveying path, the clamping mechanism being adapted to clamp a workpiece passing through the clamping hole;

[0008] A limiting mechanism, the limiting mechanism being mounted on the mounting platform and provided with a V-shaped support assembly;

[0009] a pipe cutting mechanism, the pipe cutting mechanism being mounted on the truss assembly and located between the clamping mechanism and the limiting mechanism, the pipe cutting mechanism being adapted to cut workpieces on the conveying path;

[0010] The V-shaped support assembly includes: a base assembly and a pair of sliding pad blocks. The base assembly is provided with a symmetrical set of sliding guide rails suitable for guiding. The sliding guide rails include:

[0011] at least one long guide rail, the long guide rail being mounted on the base assembly and located near the center of the base assembly;

[0012] at least one short guide rail, the short guide rail being mounted on the base assembly and being located near an edge of the base assembly;

[0013] at least one middle guide rail, the middle guide rail being mounted on the base assembly and located between the corresponding long guide rail and the short guide rail;

[0014] The sliding pad group includes:

[0015] A starting sliding block, wherein the starting sliding block is provided with a short sliding groove that matches the short guide rail, and the starting sliding block is provided with a limiting notch;

[0016] At least one transition sliding block, the transition sliding block is provided with a middle sliding groove that cooperates with the middle guide rail, the transition sliding block is provided with a positioning protrusion suitable for cooperating with the limiting notch of the starting sliding block, and the positioning protrusion is further provided with a transition limiting notch;

[0017] A locking sliding block is provided with a long sliding groove that matches the long guide rail, and a locking positioning protrusion that matches the transition limit groove of the transition sliding block is provided on the locking sliding block.

[0018] Furthermore, in order to remove the workpiece on the limiting mechanism after cutting, the positioning device for pipe cutting further includes a clamping and moving device, and the clamping and moving device includes:

[0019] a mobile drive source, the mobile drive source being mounted on the truss assembly, the mobile drive source being provided with a telescopic end;

[0020] A guide rail assembly, the guide rail assembly being fixedly mounted on the truss assembly, the guide rail assembly comprising a linear guide rail and a slider slidably engaged with the linear guide rail, the slider being connected to the telescopic end of the mobile drive source;

[0021] a connecting arm, one end of which is fixedly connected to the slider;

[0022] A workpiece clamping mechanism is fixedly mounted on the other end of the connecting arm and is suitable for clamping the workpiece on one side of the limiting mechanism after the pipe cutting mechanism cuts the pipe.

[0023] Furthermore, a specific structure of a workpiece clamping mechanism is provided, wherein the workpiece clamping mechanism comprises:

[0024] A fixing frame, the fixing frame is mounted on the connecting arm and is provided with a sliding guide groove;

[0025] a rotational drive source, the rotational drive source being fixed in the fixing frame;

[0026] A worm gear transmission pair, wherein the worm gear transmission pair includes a worm driving end and a worm gear transmission end, and the worm driving end is connected to the output shaft of the rotary drive source;

[0027] A screw, the screw being rotatably mounted in the fixing frame and being in driving connection with the turbine transmission end;

[0028] A transmission block assembly, wherein the transmission block assembly is slidably fitted in the sliding guide groove of the fixing frame, and the transmission block assembly is provided with a nut pair that cooperates with the screw;

[0029] A pair of clamping blocks are installed on the transmission block group, and the clamping blocks are provided with arc-shaped clamping surfaces suitable for abutting against the workpiece.

[0030] Furthermore, in order to improve the limiting effect of the limiting mechanism, the positioning device for pipe cutting further includes an upper pressing mechanism, which includes:

[0031] a telescopic arm assembly, the telescopic arm assembly being fixedly mounted on the truss assembly and located above the limiting mechanism;

[0032] A pressing block assembly, the pressing block assembly being mounted on the free end of the telescopic arm assembly, the pressing block assembly being provided with a pressing surface suitable for abutting against a workpiece;

[0033] The telescopic arm assembly is suitable for driving the pressing block assembly to move vertically downward to press the workpiece located on the limiting mechanism.

[0034] Furthermore, a specific type of telescopic arm assembly is provided, wherein the telescopic arm assembly is a telescopic cylinder.

[0035] Furthermore, a specific type of clamping mechanism is provided, wherein the clamping mechanism is a three-jaw chuck.

[0036] Furthermore, in order to limit the movement of the long guide rail, the short guide rail and the middle guide rail, the cross-sections of the middle portions of the long guide rail, the short guide rail and the middle guide rail are all trapezoidal;

[0037] Wherein: end blocks are provided on the ends of the long guide rail, the short guide rail and the middle guide rail, and the cross section of the end blocks is rectangular;

[0038] The corresponding starting sliding block, the transition sliding block and the locking sliding block are provided with limiting avoidance grooves that match the ending block.

[0039] Furthermore, the base assembly is further provided with a slider limiting mechanism, and the slider limiting mechanism includes:

[0040] a rotating column hinged to a side wall of the base assembly;

[0041] A limit block is fixedly mounted on the rotating column, and the limit block is provided with an abutting surface suitable for abutting the locking sliding block.

[0042] By adopting the above technical solution, the utility model has the following beneficial effects:

[0043] During use, the workpiece is conveyed from one side of the stopper mechanism to the other side of the clamping mechanism, passing through the stopper mechanism and the clamping mechanism in sequence. Once the workpiece reaches the desired position, the clamping mechanism activates first to clamp the workpiece, and then the pipe cutting mechanism activates to cut the workpiece. Over time, the V-shaped support assembly on the stopper mechanism will wear. Because workpieces of varying diameters wear differently on the V-shaped support assembly, the sliding pad assembly can be replaced accordingly to ensure wear, extending the overall service life and reducing the frequency of replacement and maintenance.

[0044] In addition, the end blocks arranged on the long guide rail, short guide rail and middle guide rail can effectively limit the movement of the starting sliding block, transition sliding block and locking sliding block on the sliding pad group; the upper clamping mechanism can drive the clamping block assembly to press the workpiece vertically downward through the telescopic arm assembly during the cutting process, and form a positioning and clamping that cooperates with the V-shaped support assembly to prevent the workpiece from positional displacement and shaking during the cutting process, thereby further improving the processing accuracy of pipe cutting.

[0045] In summary, the utility model improves maintenance efficiency, extends overall service life, and reduces use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of the positioning device for pipe cutting of the present utility model;

[0047] Figure 2 This is a schematic diagram of the three-dimensional structure of the V-shaped support assembly of the positioning device for pipe cutting of the present invention;

[0048] Figure 3 This is a schematic diagram of the three-dimensional structure of the base assembly of the V-shaped support assembly of the positioning device for pipe cutting of the present invention;

[0049] Figure 4 This is a schematic diagram of the three-dimensional structure of the sliding guide rail group of the V-shaped support assembly of the positioning device for pipe cutting of the present invention;

[0050] Figure 5 This is a structural schematic diagram of the workpiece clamping mechanism of the clamping moving device of the positioning device for pipe cutting of the present utility model. DETAILED DESCRIPTION

[0051] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0052] like Figure 1-5 As shown, a positioning device for pipe cutting includes:

[0053] The base includes a mounting platform 11 and a truss assembly 12 fixedly connected to the mounting platform 11. The mounting platform 11 is provided with a conveying path suitable for conveying the workpiece along the workpiece conveying direction;

[0054] The clamping mechanism 2 is mounted on the base and is provided with a clamping hole on the conveying path. The clamping mechanism 2 is suitable for clamping a workpiece passing through the clamping hole.

[0055] The limiting mechanism 3 is installed on the mounting platform 11 and is provided with a V-shaped support assembly 30;

[0056] The pipe cutting mechanism 4 is installed on the truss assembly 12 and is located between the clamping mechanism 2 and the limiting mechanism 3. The pipe cutting mechanism 4 is suitable for cutting workpieces on the conveying path;

[0057] The V-shaped support assembly 30 includes a base assembly and a pair of sliding pad blocks. The base assembly is provided with a symmetrical set of sliding guide rails suitable for guiding. The sliding guide rails include:

[0058] Long guide rail 311, the long guide rail 311 is installed on the base assembly and is located near the center of the base assembly;

[0059] A short guide rail 312 is mounted on the base assembly and is located near an edge of the base assembly;

[0060] The middle guide rail 313 is installed on the base assembly and is located between the corresponding long guide rail 311 and the short guide rail 312;

[0061] Sliding pad set includes:

[0062] The starting sliding block 32 is provided with a short sliding groove 321 that matches the short guide rail 312, and a limiting notch 322 is provided on the starting sliding block 32;

[0063] The transition sliding block 33 is provided with a middle sliding groove 331 that cooperates with the middle guide rail 313. The transition sliding block 33 is provided with a positioning protrusion 332 that is suitable for cooperating with the limiting groove 322 of the starting sliding block 32. The positioning protrusion 332 is also provided with a transition limiting groove 333;

[0064] The locking sliding block 34 is provided with a long sliding groove 341 that matches the long guide rail 311 , and the locking sliding block 34 is provided with a locking positioning protrusion 342 that matches the transition limit groove 333 of the transition sliding block 33 .

[0065] In this embodiment, if Figure 1-4 As shown, during use, a workpiece is conveyed from the side of the limiting mechanism 3 to the side of the clamping mechanism 2, passing through the limiting mechanism 3 and the clamping mechanism 2 in sequence. Once the workpiece reaches the predetermined position, the clamping mechanism 2 is first activated to clamp the workpiece, and then the pipe cutting mechanism 4 is activated to cut the workpiece. Over extended use, the V-shaped support assembly 30 on the limiting mechanism 3 will wear. Because workpieces of varying diameters wear differently on the V-shaped support assembly 30, the corresponding sliding pad assembly can be replaced based on the actual wear, thereby extending the overall service life and reducing the frequency of replacement and maintenance.

[0066] In this embodiment, the workpiece is mainly a pipe, specifically a steel pipe. In some embodiments, the number of the transition sliding block 33 corresponds to the number of the middle guide rail 313, and is not limited to one, but can be multiple.

[0067] In this embodiment, the V-shaped support assembly 30 adopts a modular design. The long guide rail 311, short guide rail 312, and middle guide rail 313 provided on the base assembly form a sliding guide rail group, which cooperates with the sliding pad group formed by the starting slide block 32, the transition slide block 33, and the locking slide block 34 to form a complete V-shaped support structure. The sliding guide rail group on the base assembly is arranged symmetrically to ensure that the workpiece can be stably positioned on the V-shaped support assembly 30. At the same time, the segmented design of the sliding guide rail group facilitates the assembly and replacement of the sliding pad group. During actual use, the starting slide block 32 cooperates with the short guide rail 312 through the short slide groove 321, the transition slide block 33 cooperates with the middle guide rail 313 through the middle slide groove 331, and the locking slide block 34 cooperates with the long guide rail 311 through the long slide groove 341. At the same time, the limiting notch 322 on the starting sliding block 32 cooperates with the positioning protrusion 332 on the transition sliding block 33, and the transition limiting notch 333 on the transition sliding block 33 cooperates with the locking positioning protrusion 342 on the locking sliding block 34, forming a complete limiting structure to prevent the sliding pad group from relative displacement during use. When a certain area of ​​the V-shaped support assembly 30 is worn, the corresponding sliding block can be replaced separately according to the location of the wear without replacing the entire V-shaped support assembly 30. For example, when the workpiece diameter is small, it mainly contacts the locking sliding block 34, and the locking sliding block 34 can be replaced separately; when the workpiece diameter is large, it mainly contacts the starting sliding block 32 and the transition sliding block 33, and these worn sliding blocks can be replaced separately. This modular replacement method not only reduces maintenance costs, but also increases the service life of the device.

[0068] Specifically, such as Figure 1 As shown, the positioning device for pipe cutting further includes a clamping and moving device, which includes:

[0069] A mobile driving source, the mobile driving source is mounted on the truss assembly 12, and the mobile driving source is provided with a telescopic end;

[0070] The guide rail assembly 51 is fixedly mounted on the truss assembly 12. The guide rail assembly 51 includes a linear guide rail and a slider that slides with the linear guide rail. The slider is connected to the telescopic end of the mobile drive source.

[0071] A connecting arm 52, one end of which is fixedly connected to the slider;

[0072] The workpiece clamping mechanism is fixedly mounted on the other end of the connecting arm 52 . The workpiece clamping mechanism is suitable for clamping the workpiece on one side of the limiting mechanism 3 after the pipe cutting mechanism 4 cuts the pipe.

[0073] Specifically, such as Figure 5 As shown, the workpiece clamping mechanism includes:

[0074] A fixing frame 53 is mounted on the connecting arm 52 and is provided with a sliding guide groove;

[0075] A rotation drive source, the rotation drive source is fixed in the fixed frame 53;

[0076] The worm gear transmission pair includes a worm driving end and a worm gear transmission end, and the worm driving end is connected to the output shaft of the rotation drive source;

[0077] The screw is rotatably mounted in the fixed frame 53 and is in driving connection with the turbine transmission end;

[0078] The transmission block group 56 is slidably fitted in the sliding guide groove of the fixed frame 53, and the transmission block group 56 is provided with a nut pair that cooperates with the screw;

[0079] A pair of clamping blocks 58 are mounted on the transmission block assembly 56 , and the clamping blocks 58 are provided with arc-shaped clamping surfaces suitable for abutting against the workpiece.

[0080] In this embodiment, if Figure 1 and Figure 5 As shown, the clamping mechanism uses a mobile drive source to drive the slider on the guide rail assembly 51 along the linear guide rail, thereby driving the connecting arm 52 and the workpiece clamping mechanism to perform reciprocating linear motion. The telescopic end of the mobile drive source is connected to the slider, ensuring that the workpiece clamping mechanism can stably move to the predetermined position and achieve precise clamping and positioning of the cut workpiece.

[0081] When the workpiece clamping mechanism needs to clamp a workpiece, the rotary drive source rotates the screw via a worm gear transmission pair. The worm's active end of the worm gear pair is connected to the output shaft of the rotary drive source, while the worm gear's drive end is in transmission connection with the screw. During the screw's rotation, the nut pair on the transmission block assembly 56 engages with the screw, causing the transmission block assembly 56 to reciprocate within the sliding guide groove of the fixed frame 53, thereby driving the pair of clamping blocks 58 mounted on the transmission block assembly 56 to move toward or away from each other, thereby clamping or loosening the workpiece.

[0082] The curved clamping surface on clamping block 58 can conform to workpieces of varying diameters, improving clamping stability and reliability. The self-locking nature of the worm gear pair ensures reliable clamping, maintaining a stable grip on the workpiece even if the rotary drive source loses power. This design allows the clamping and moving device to promptly clamp and transfer the workpiece to one side of the limiting mechanism 3 after the pipe cutting mechanism 4 completes cutting, improving the continuity and efficiency of the pipe cutting process. The curved clamping surface of clamping block 58 features anti-slip grooves, enhancing friction with the workpiece.

[0083] In this embodiment, the mobile drive source can be a cylinder or a combination of a screw and a motor, and the rotation drive source can be a device that can output rotation, such as a motor, an engine, a hydraulic motor, or a combination of one of them and a reducer.

[0084] Specifically, such as Figure 1 As shown, the positioning device for pipe cutting further includes an upper pressing mechanism, which may be of the following structure, including:

[0085] The telescopic arm assembly 61 is fixedly mounted on the truss assembly 12 and is located above the limiting mechanism 3;

[0086] A pressing block assembly 62 is mounted on the free end of the telescopic arm assembly 61 and is provided with a pressing surface suitable for abutting against a workpiece;

[0087] The telescopic arm assembly 61 is suitable for driving the pressing block assembly 62 to move vertically downward to press the workpiece located on the limiting mechanism 3 .

[0088] Specifically, such as Figure 1-2 As shown, the telescopic arm assembly 61 is a telescopic cylinder.

[0089] In this embodiment, if Figure 1As shown, the upper clamping mechanism utilizes a telescopic cylinder as the telescopic arm assembly 61, which is pneumatically controlled to achieve the lifting and lowering motion of the clamping block assembly 62. The telescopic cylinder is fixedly mounted on the truss assembly 12 and positioned directly above the stop mechanism 3, ensuring that the clamping block assembly 62 is accurately aligned with the workpiece. Once the workpiece is in place, the telescopic cylinder drives the clamping block assembly 62 vertically downward, causing the clamping surface of the clamping block assembly 62 to abut against the workpiece surface, thereby firmly pressing the workpiece against the stop mechanism 3. This prevents the workpiece from shifting or shaking during cutting, thereby improving cutting accuracy.

[0090] Specifically, such as Figure 1 As shown, the clamping mechanism 2 is a three-jaw chuck.

[0091] In this embodiment, if Figure 1 As shown, the clamping mechanism 2 utilizes a three-jaw chuck structure, capable of fully clamping circular workpieces. The three-jaw chuck can be opened and closed by an external drive source or manually, ensuring the workpiece remains stable during the clamping process. It is also suitable for pipes of varying diameters.

[0092] Specifically, such as Figure 3-4 As shown, the cross-sections of the middle portions of the long guide rail 311, the short guide rail 312 and the middle guide rail 313 are all trapezoidal;

[0093] Wherein: end blocks are provided at the ends of the long guide rail 311, the short guide rail 312 and the middle guide rail 313, and the cross section of the end blocks is rectangular;

[0094] The corresponding starting sliding block 32 , transition sliding block 33 and locking sliding block 34 are provided with limiting avoidance grooves that cooperate with the ending block.

[0095] Specifically, such as Figure 3 As shown, the base assembly is also provided with a slider limiting mechanism, which includes:

[0096] A rotating column 71 is hinged to the side wall of the base assembly;

[0097] The limit block 72 is fixedly mounted on the rotating column 71 . The limit block 72 is provided with an abutting surface suitable for abutting the locking sliding block 34 .

[0098] In this embodiment, if Figure 2-3As shown, the middle portions of the long guide rail 311, short guide rail 312, and middle guide rail 313 feature a trapezoidal cross-section, which cooperates with the corresponding slots on each sliding block to form a stable guide structure. The rectangular end blocks at the ends of the guide rails cooperate with the limit avoidance grooves on the sliding blocks, preventing the sliding blocks from detaching from the guide rails and facilitating their installation and removal. Furthermore, the slider limit mechanism provided on the base assembly, through the contact between the limit block 72 on the rotating column 71 and the abutment surface of the locking sliding block 34, further ensures the stability of the sliding block assembly during use, ensuring that the V-shaped support assembly 30 can reliably support the workpiece.

[0099] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A positioning device for pipe cutting, characterized in that: include: A base, the base comprising a mounting platform (11) and a truss assembly (12) fixedly connected to the mounting platform (11), wherein the mounting platform (11) is provided with a conveying path suitable for conveying the workpiece along a workpiece conveying direction; A clamping mechanism (2), the clamping mechanism (2) being mounted on the base, the clamping mechanism (2) being provided with a clamping hole on the conveying path, the clamping mechanism (2) being suitable for clamping a workpiece passing through the clamping hole; A limiting mechanism (3), the limiting mechanism (3) being mounted on the mounting platform (11), and a V-shaped support assembly (30) being provided on the limiting mechanism (3); a pipe cutting mechanism (4), the pipe cutting mechanism (4) being mounted on the truss assembly (12) and located between the clamping mechanism (2) and the limiting mechanism (3), the pipe cutting mechanism (4) being suitable for cutting workpieces on the conveying path; The V-shaped support assembly (30) comprises: a base assembly and a pair of sliding pad blocks; the base assembly is provided with a symmetrical set of sliding guide rails suitable for guiding; the sliding guide rails include: at least one long guide rail (311), the long guide rail (311) being mounted on the base assembly and located near the center of the base assembly; at least one short guide rail (312), the short guide rail (312) being mounted on the base assembly and located near an edge of the base assembly; at least one middle guide rail (313), the middle guide rail (313) being mounted on the base assembly and located between the corresponding long guide rail (311) and the short guide rail (312); The sliding pad group includes: A starting sliding block (32), wherein the starting sliding block (32) is provided with a short sliding groove (321) that matches the short guide rail (312), and the starting sliding block (32) is provided with a limiting notch (322); At least one transition sliding block (33), the transition sliding block (33) being provided with a middle sliding groove (331) cooperating with the middle guide rail (313), the transition sliding block (33) being provided with a positioning protrusion (332) adapted to cooperate with the limiting notch (322) of the starting sliding block (32), and the positioning protrusion (332) being further provided with a transition limiting notch (333); A locking sliding block (34) is provided with a long sliding groove (341) that matches the long guide rail (311), and a locking positioning protrusion (342) that matches the transition limit groove (333) of the transition sliding block (33) is provided on the locking sliding block (34).

2. The positioning device for pipe cutting according to claim 1, characterized in that: Also included is a clamping movement device, the clamping movement device comprising: a mobile drive source, the mobile drive source being mounted on the truss assembly (12), the mobile drive source being provided with a telescopic end; A guide rail assembly (51), the guide rail assembly (51) being fixedly mounted on the truss assembly (12), the guide rail assembly (51) comprising a linear guide rail and a slider slidably engaged with the linear guide rail, the slider being connected to the telescopic end of the mobile drive source; a connecting arm (52), one end of the connecting arm (52) being fixedly connected to the slider; A workpiece clamping mechanism is fixedly mounted on the other end of the connecting arm (52), and is suitable for clamping the workpiece on one side of the limiting mechanism (3) after the pipe cutting mechanism (4) cuts the pipe.

3. The positioning device for pipe cutting according to claim 2, characterized in that: The workpiece clamping mechanism comprises: A fixing frame (53), the fixing frame (53) being mounted on the connecting arm (52), the fixing frame (53) being provided with a sliding guide groove; a rotational drive source, the rotational drive source being fixed in the fixing frame (53); A worm gear transmission pair, wherein the worm gear transmission pair includes a worm driving end and a worm gear transmission end, and the worm driving end is connected to the output shaft of the rotary drive source; a screw, the screw being rotatably mounted in the fixing frame (53) and being in driving connection with the turbine transmission end; A transmission block assembly (56), wherein the transmission block assembly (56) is slidably fitted in the sliding guide groove of the fixing frame (53), and a nut pair that matches the screw is provided on the transmission block assembly (56); A pair of clamping blocks (58) are installed on the transmission block group (56), and the clamping blocks (58) are provided with arc-shaped clamping surfaces suitable for abutting against workpieces.

4. The positioning device for pipe cutting according to claim 1, characterized in that: It also includes an upper pressing mechanism, which includes: a telescopic arm assembly (61), the telescopic arm assembly (61) being fixedly mounted on the truss assembly (12) and located above the limiting mechanism (3); A pressing block assembly (62), the pressing block assembly (62) being mounted on the free end of the telescopic arm assembly (61), the pressing block assembly (62) being provided with a pressing surface suitable for abutting against a workpiece; The telescopic arm assembly (61) is suitable for driving the pressing block assembly (62) to move vertically downward to press the workpiece located on the limiting mechanism (3).

5. The positioning device for pipe cutting according to claim 4, characterized in that: The telescopic arm assembly (61) is a telescopic cylinder.

6. The positioning device for pipe cutting according to claim 1, characterized in that: The clamping mechanism (2) is a three-jaw chuck.

7. The positioning device for pipe cutting according to claim 1, characterized in that: The cross sections of the middle portions of the long guide rail (311), the short guide rail (312) and the middle guide rail (313) are all trapezoidal; Wherein: end blocks are provided at the ends of the long guide rail (311), the short guide rail (312) and the middle guide rail (313), and the cross section of the end blocks is rectangular; The corresponding starting sliding block (32), the transition sliding block (33) and the locking sliding block (34) are provided with limiting avoidance grooves that match the ending block.

8. The positioning device for pipe cutting according to claim 1, characterized in that: The base assembly is also provided with a slider limiting mechanism, which includes: A rotating column (71), the rotating column (71) is hinged to the side wall of the base assembly; A limit block (72) is fixedly mounted on the rotating column (71), and the limit block (72) is provided with an abutting surface suitable for abutting the locking sliding block (34).

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