Steel pipe cutting device

Abstract

The utility model relates to the technical field of pipeline cutting equipment, and discloses a steel pipe cutting device which comprises a base, a grinding wheel saw body is arranged on the base, the side wall of one side of the base is connected with an auxiliary base through a telescopic assembly, and the telescopic assembly can adjust the distance between the auxiliary base and the base through self stretching and retracting. Supporting assemblies used for containing steel pipes to be machined are arranged on the top faces of the auxiliary base and the base correspondingly. The auxiliary seat is connected with the base through the telescopic assembly, and the distance between the auxiliary seat and the base can be adjusted by controlling the telescopic assembly to perform adaptive telescopic motion, so that the steel pipe cutting device can be suitable for cutting to-be-machined steel pipes with different lengths, and compared with the prior art, the steel pipe cutting device is more convenient to use. The device has the advantages of good applicability and flexibility in use.

Description

Technical Field

[0001] The utility model relates to a steel pipe cutting device, belonging to the technical field of pipeline cutting equipment. Background Art

[0002] At present, most of the cutting work for pipelines, especially stainless steel pipelines, is completed by grinding wheel saws. The traditional hand-pressure grinding wheel saw requires manual operation by the operator, that is, the grinding wheel saw is controlled by hand pressure to descend and contact the pipeline to perform the required cutting work. When the hardness of the cut pipeline is high or the diameter is large, the cutting cannot be completed in a short time. It is necessary to press down slowly manually and keep the pressing state for a long time to cut such pipelines. There is a problem of consuming a lot of labor. In addition, during the use of the grinding wheel saw, if the manual pressing method is incorrect, it may cause the grinding wheel saw to break, etc., causing harm to the operator.

[0003] To this end, in the prior art, a utility model patent with a Chinese patent authorization announcement number of CN214291093U discloses a steel pipe processing device, including a bracket, and a table on the top of the bracket. A connecting seat is provided on the upper plate surface of the table, a rotating shaft is provided on the connecting seat, a connecting strip is fixed on the rotating shaft, and a support frame is fixed on the upper part of one side of the connecting strip. A cutting disc is provided on one end of the support frame located above the bracket, and a driving motor for driving the cutting disc to rotate is provided on the support frame. A first driving cylinder is hinged between one end of the support frame located outside the bracket and the side of the bracket. Two strip plates are provided on the table below the cutting disc, and a cushion block is provided between a group of opposite ends of the two strip plates. Two fixed blocks are provided on one of the strip plates. A connecting block is provided on the other strip plate. A second driving cylinder is fixed on the outer surface of the connecting block, and a pressing plate is provided on the outer end of the piston rod of the second driving cylinder. When in use, the steel pipe can be automatically cut without the need for the staff to hold the cutting machine, thereby reducing the labor intensity of the operator and ensuring the life and health of the operator.

[0004] However, the above processing device still has the following problems when actually used:

[0005] The cooperation between the clamping plate and the fixing block is difficult to fix the steel pipe with a long pipeline length well, so that it is not suitable for cutting the steel pipe with a long pipeline length, and there is a problem of insufficient applicability. Utility Model Content

[0006] In order to solve the above problems existing in the prior art, the utility model provides a steel pipe cutting device.

[0007] The technical solution of the utility model is as follows:

[0008] A steel pipe cutting device comprises a base, on which a grinding wheel saw body is arranged, and one side wall of the base is connected to an auxiliary seat by arranging a telescopic component, and the telescopic component can adjust the distance between the auxiliary seat and the base by its own telescopic movement; the auxiliary seat and the top surface of the base are both provided with support components for placing the steel pipe to be processed.

[0009] Furthermore, the telescopic assembly includes a first electric telescopic rod, a motor end of the first electric telescopic rod is connected to the base, and a telescopic end of the first electric telescopic rod is connected to the auxiliary seat.

[0010] Furthermore, a storage groove is provided on the side wall of the base, and a first connecting block is provided on the motor end of the first electric telescopic rod, and the first connecting block is slidably connected to the storage groove. The first electric telescopic rod can be retracted and extended out of the storage groove through the sliding connection between the first connecting block and the storage groove. A bearing is embedded on the side wall of the auxiliary seat, and the telescopic end of the first electric telescopic rod is connected to the bearing.

[0011] Furthermore, a first thread is provided on the side wall of the receiving groove close to the slot position, and a second thread is provided on the outer wall of the first connecting block. When the first connecting block slides to the slot position of the receiving groove, the second thread is screwed to the first thread to be fixedly connected to the receiving groove.

[0012] Furthermore, a connecting shaft is arranged on the bottom wall of the storage groove, a fixing block is arranged on the shaft wall of the connecting shaft, a connecting groove is arranged on the side wall of the first connecting block away from the first electric telescopic rod, the connecting shaft can be inserted into the connecting groove, a fixing groove is arranged on the groove side wall of the connecting groove, the notch position of the connecting groove is connected with the fixing groove by opening a connecting channel, and during the process of inserting the connecting shaft into the connecting groove, the fixing block can enter the connecting channel and can enter the fixing groove through the connecting channel.

[0013] Furthermore, the support assembly includes a positioning seat, a top surface of which is provided with a placement groove in a "V"-shaped structure, in which symmetrically arranged rollers are rotatably connected, and the rollers on both sides are arranged so that the wheel walls can be movably extended out of the corresponding side inclined walls of the placement groove.

[0014] Furthermore, a stand is provided on the base, a mounting groove is provided on the stand, the grinding wheel saw body includes a swing arm, the swing arm is movably installed in the mounting groove by setting a connecting shaft, a saw wheel is provided on the end of the swing arm close to the supporting assembly side, and a pushing assembly is provided on the end of the swing arm away from the saw wheel side, and the pushing assembly can push the swing arm to move around the connecting shaft.

[0015] Furthermore, the pushing assembly includes a second electric telescopic rod, the motor end of the second electric telescopic rod is movably connected to the base by a hinge seat, a second connecting block is provided on the telescopic end of the second electric telescopic rod, a sliding pin is passed through the second connecting block, and a sliding groove is provided on the end of the swing arm away from the saw wheel side, and the sliding pin is slidably connected in the sliding groove.

[0016] Furthermore, a control panel is also provided on the stand, and the control panel is electrically connected to the telescopic component, the saw wheel and the pushing component respectively, and the control panel can control the working states of the telescopic component, the saw wheel and the pushing component.

[0017] Furthermore, a foot support is provided on the bottom surface of the base and the auxiliary seat, wherein a threaded blind hole is provided on the bottom surface of the auxiliary seat, and a third thread is provided on the outer wall of the foot support arranged on the bottom surface of the auxiliary seat, and the foot support can be connected to the bottom surface of the auxiliary seat by screwing the third thread and the threaded blind hole, and a mounting column is movably inserted into the interior of the foot support through a mounting hole, a pulley is provided at the bottom of the mounting column, a fourth thread is provided on the outer wall of the mounting column, and a fifth thread is provided on the inner wall of the foot support, and the mounting column can be connected to the mounting hole by screwing the fourth thread and the fifth thread, and the spiral direction of the fourth thread is set in the opposite direction to the spiral direction of the third thread, and a special-shaped hole is also provided on the top of the mounting column, and a limiting column that can be movably inserted into the special-shaped hole is provided on the bottom wall of the threaded blind hole, and the shape of the limiting column is adapted to the shape of the special-shaped hole.

[0018] The utility model has the following beneficial effects:

[0019] The utility model arranges an auxiliary seat on one side of the base, and connects the auxiliary seat with the base by arranging a telescopic assembly. When it is necessary to process a steel pipe to be processed with a longer length, the first electric telescopic rod in the telescopic assembly is controlled to start extending movement, which can drive the auxiliary seat to move in a direction away from the base. After adjusting to an appropriate distance, the first electric telescopic rod is controlled to stop moving, and then the steel pipe to be processed is placed on the support assembly on the base and the auxiliary seat. At this time, the support assembly on the base and the auxiliary seat can well support and fix the steel pipe to be processed with a longer length to ensure the subsequent processing effect. When it is necessary to process the steel pipe to be processed with a shorter length, the distance between the auxiliary seat and the base is adjusted to the required distance by controlling the first electric telescopic rod to perform a contraction movement, and then the steel pipe to be processed can be placed on the appropriate support assembly. Compared with the prior art, the utility model has the advantages of good applicability and flexible use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2This is a schematic diagram of the structure of the utility model for processing a relatively long steel pipe to be processed;

[0022] Figure 3 This is a schematic diagram of the structure of the utility model for processing a short-length steel pipe to be processed;

[0023] Figure 4 This is the enlarged view of point A;

[0024] Figure 5 This is an enlarged view of point B;

[0025] Figure 6 This is the enlarged view of point C;

[0026] Figure 7 is a first connection schematic diagram of the connecting shaft and the connecting groove;

[0027] Figure 8 is a second connection schematic diagram of the connecting shaft and the connecting groove;

[0028] Fig. 9 It is a side view of the base in the utility model;

[0029] Fig.10 This is the enlarged view of point D;

[0030] Fig.11 This is the enlarged view of point E;

[0031] Fig.12 It is a schematic diagram of the structure of the connection between the limiting column and the special-shaped hole.

[0032] The reference numerals in the figure are as follows:

[0033] 1. Base; 2. Auxiliary seat; 3. Steel pipe to be processed; 4. First electric telescopic rod; 5. Storage groove; 6. First connecting block; 7. Bearing; 8. First thread; 9. Second thread; 10. Connecting shaft; 11. Fixed block; 12. Connecting groove; 13. Fixed groove; 14. Connecting channel; 15. Positioning seat; 16. Placement groove; 17. Roller; 18. Stand; 19. Installation groove; 20. Swing arm; 21. Connecting shaft; 22. Saw wheel; 23. Second electric telescopic rod; 24. Hinge seat; 25. Second connecting block; 26. Sliding pin; 27. Slide groove; 28. Control panel; 29. ​​Foot support; 30. Threaded blind hole; 31. Third thread; 32. Mounting hole; 33. Mounting column; 34. Pulley; 35. Fourth thread; 36. Fifth thread; 37. Special-shaped hole; 38. Limit column. DETAILED DESCRIPTION

[0034] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example: Please refer to Figures 1 to 12The present embodiment provides a steel pipe cutting device, including a base 1, a stand 18 is provided on the base 1, a mounting groove 19 is provided on the top surface of the stand 18, and a grinding wheel saw body is connected in the mounting groove 19. The grinding wheel saw body includes a swing arm 20, and the swing arm 20 is movably installed in the mounting groove 19 by providing a connecting shaft 21, that is, the two ends of the connecting shaft 21 are movably connected to the corresponding side groove walls of the mounting groove 19, and the swing arm 20 is fixedly connected to the shaft wall of the connecting shaft 21, so that the swing arm 20 can perform a corresponding swing operation in the mounting groove 19 under the rotation of the connecting shaft 21. The two side ends of the swing arm 20 are arranged to pass through the installation groove 19, a saw wheel 22 is fixedly provided on the front end of the swing arm 20, and a pushing assembly is provided on the rear end of the swing arm 20. The pushing assembly can push the rear end of the swing arm 20 to make the swing arm 20 move around the connecting shaft 21, so that the saw wheel 22 on the front end of the swing arm 20 can move up and down accordingly to meet the requirements of the cutting work.

[0036] In this embodiment, the pushing assembly includes a second electric telescopic rod 23, the motor end of the second electric telescopic rod 23 is movably connected to the base 1 by setting a hinge seat 24, a second connecting block 25 is provided on the telescopic end of the second electric telescopic rod 23, a sliding pin 26 is penetrated on the second connecting block 25, and a sliding groove 27 is provided on the rear end of the swing arm 20, and the sliding pin 26 is slidably connected in the sliding groove 27. Through the above-mentioned arrangement, when the second electric telescopic rod 23 starts to work, its telescopic rod end can drive the second connecting block 25 to make a corresponding movement, so that the second connecting block 25 drives the sliding pin 26 to slide in the sliding groove 27, and when the sliding pin 26 moves in the sliding groove 27, it can squeeze the sliding groove 27 to make the swing arm 20 move around the connecting shaft 21, so that the saw wheel 22 on the front end of the swing arm 20 can make the required up and down movement.

[0037] The right side wall of the base 1 is connected to the auxiliary seat 2 by setting a telescopic component. The telescopic component can adjust the distance between the auxiliary seat 2 and the base 1 by its own telescopic movement. In this embodiment, the telescopic component includes a first electric telescopic rod 4, which is horizontally arranged between the base 1 and the auxiliary seat 2. The motor end of the first electric telescopic rod 4 is connected to the base 1, and the telescopic end of the first electric telescopic rod 4 is connected to the auxiliary seat 2. The top surfaces of the auxiliary seat 2 and the base 1 are both provided with support components for placing the steel pipe 3 to be processed, wherein two support components are provided on the top surface of the base 1, and the movement path of the saw wheel 22 when it moves up and down under the action of the pushing component will pass between the two support components. In this embodiment, the support assembly includes a positioning seat 15, and a placement groove 16 with a "V"-shaped structure is opened on the top surface of the positioning seat 15. The placement groove 16 is rotatably connected with symmetrically arranged rollers 17. The rollers 17 on both sides are arranged with wheel walls movably extending out of the corresponding side inclined walls of the placement groove 16. When the steel pipe 3 to be processed is placed on the support assembly, the wheel walls of the rollers 17 on both sides extending out of the placement groove 16 will abut against the pipe wall of the steel pipe 3 to be processed, so as to play the required supporting and fixing role.

[0038] Through the above-mentioned arrangement, when processing a shorter steel pipe 3 to be processed, the steel pipe 3 to be processed is directly placed on the two supporting components on the top surface of the base 1, and the position to be cut is aligned with the position of the saw wheel 22. Then, by starting the pushing component, the pushing component drives the saw wheel 22 to move downward, and the required cutting work can be performed. When it is necessary to process a longer steel pipe 3 to be processed, the first electric telescopic rod 4 in the telescopic assembly is controlled to start extending movement, which can drive the auxiliary seat 2 to move away from the base 1. After adjusting to the appropriate distance, the first electric telescopic rod 4 is controlled to stop moving, and then the longer steel pipe 3 to be processed is placed on the supporting assemblies on the base 1 and the auxiliary seat 2, so that the supporting assemblies on the base 1 and the auxiliary seat 2 can well support and fix the longer steel pipe 3 to be processed, so as to ensure the subsequent processing effect, and then start the pushing assembly to drive the saw wheel 22 to move downward, so as to perform the required cutting work. As the cutting work continues, the length of the steel pipe 3 to be processed will continue to shorten. As the length of the steel pipe 3 to be processed shortens, Keyang controls the first electric telescopic rod 4 to perform an appropriate contraction movement so that the distance between the base 1 and the auxiliary seat 2 can always be adapted to the length of the steel pipe 3 to be processed.

[0039] To facilitate the use of the staff, a control panel 28 is also provided on the stand 18. The control panel 28 is electrically connected to the telescopic component, the saw wheel 22 and the pushing component respectively. The control panel 28 can control the working status of the telescopic component, the saw wheel 22 and the pushing component. The staff can control the working status of the telescopic component, the saw wheel 22 and the pushing component by using the control panel 28.

[0040] In order to reduce the overall volume of the cutting device and increase its portability. In this embodiment, a storage groove 5 is provided inwardly on the right side wall of the base 1, and a first connecting block 6 is provided on the motor end of the first electric telescopic rod 4. The first connecting block 6 is slidably connected to the storage groove 5. The first electric telescopic rod 4 can be retracted and extended from the storage groove 5 through the sliding connection between the first connecting block 6 and the storage groove 5. When the first electric telescopic rod 4 is retracted and extended from the storage groove 5, the auxiliary seat 2 will follow and move accordingly, thereby reducing the overall volume of the cutting device and making it convenient to carry. A bearing 7 is also embedded on the left side wall of the auxiliary seat 2. The telescopic end of the first electric telescopic rod 4 is connected to the bearing 7. The setting of the bearing 7 enables the first electric telescopic rod 4 to be rotatably connected to the auxiliary seat 2. When the first electric telescopic rod 4 rotates, the first connecting block 6 can rotate in the storage groove 5 accordingly.

[0041] In order to fix the first electric telescopic rod 4 in the extended state and the retracted state. In this embodiment, a first thread 8 is provided on the side wall of the receiving groove 5 close to the notch position, and a second thread 9 is provided on the outer wall of the first connecting block 6. When the first connecting block 6 slides to the notch position of the receiving groove 5, the second thread 9 is screwed with the first thread 8 to be fixedly connected with the receiving groove 5. At this time, the first electric telescopic rod 4 is in the extended state, which is used to adapt to the steel pipe 3 to be processed with a longer length. A connecting shaft 10 is arranged on the bottom wall of the receiving groove 5, and a fixing block 11 is arranged on the shaft wall of the connecting shaft 10. A connecting groove 12 is provided on the side wall of the first connecting block 6 away from the first electric telescopic rod 4, and the connecting shaft 10 can be inserted into the connecting groove 12. A fixing groove 13 is provided on the groove side wall of the connecting groove 12. The notch position of the connecting groove 12 is connected with the fixing groove 13 by providing a connecting channel 14. During the process of inserting the connecting shaft 10 into the connecting groove 12, the fixing block 11 can enter the connecting channel 14 and can enter the fixing groove 13 through the connecting channel 14. After the fixing block 11 enters the fixing groove 13, the first electric telescopic rod 4 is rotated so that the first connecting block 6 rotates with it. When the first fixing block 11 rotates, the fixing block 11 will move in the fixing groove 13. After the fixing block 11 is misaligned with the connecting channel 14, the fixing block 11 cannot leave the fixing groove 13 through the connecting channel 14. At this time, the first connecting block 6 and the connecting shaft 10 are fixedly connected together. At this time, the first electric telescopic rod 4 is in a retracted state, which is used to adapt to the steel pipe 3 to be processed with a shorter length or other situations.

[0042] The bottom surfaces of the base 1 and the auxiliary base 2 are both provided with foot supports 29, which are used to support the base 1 and the auxiliary base 2 standing on the ground. To facilitate the movement of the auxiliary base 2, a threaded blind hole 30 is provided on the bottom surface of the auxiliary base 2, and a third thread 31 is provided on the outer wall of the foot support 29 provided on the bottom surface of the auxiliary base 2. The foot support 29 can be connected to the bottom surface of the auxiliary base 2 through the threaded connection between the third thread 31 and the threaded blind hole 30. The inside of the foot support 29 is provided with a mounting column 33 that is movably penetrated by the mounting hole 32, and a pulley 34 is provided at the bottom of the mounting column 33. At the same time, the foot support 29 is provided with a fourth thread 35 on the outer wall of the mounting column 33, and the inner wall of the foot support 29 is provided with a fifth thread 36. The mounting column 33 can be connected to the mounting hole 32 by screwing the fourth thread 35 and the fifth thread 36. At the same time, the spiral direction of the fourth thread 35 is set in the opposite direction of the spiral direction of the third thread 31. A special-shaped hole 37 is also provided on the top of the mounting column 33, and a limiting column 38 that can be movably inserted into the special-shaped hole 37 is provided on the bottom wall of the threaded blind hole 30. The shape of the limiting column 38 is adapted to the shape of the special-shaped hole 37. In this embodiment, the cross-sections of the special-shaped hole 37 and the limiting column 38 are both hexagonal, so that the mounting column 33 cannot rotate under the cooperation of the limiting column 38 and the special-shaped hole 37, and can only move up and down along the limiting column 38.

[0043] Through the above-mentioned arrangement, when the auxiliary seat 2 needs to be moved, the foot support 29 on the bottom surface of the auxiliary seat 2 is rotated. At this time, the foot support 29 will move upward into the threaded blind hole 30 under the screw connection of the third thread 31 and the threaded blind hole 30. At the same time, since the spiral direction of the fourth thread 35 is set in the opposite direction to the spiral direction of the third thread 31, and the matching arrangement of the limit column 38 and the special-shaped hole 37 makes it impossible for the mounting column 33 to rotate. During the rotation of the foot support 29, the mounting column 33 will move in the opposite direction to the movement direction of the foot support 29 under the screw connection of the fourth thread 35 and the fifth thread 36, that is, it will move downward out of the mounting hole 32, so that the pulley 34 can extend downward from the bottom of the foot support 29 and contact the ground, so as to provide sliding support for the movement of the auxiliary seat 2, making the movement of the auxiliary seat 2 more convenient.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steel pipe cutting device, comprising a base (1), on which a grinding wheel saw body is arranged, characterized in that: The auxiliary seat (2) is connected to a side wall of the base (1) by means of a telescopic assembly, and the telescopic assembly can adjust the distance between the auxiliary seat (2) and the base (1) by its own telescopic movement; and support assemblies for placing the steel pipe (3) to be processed are arranged on the top surfaces of the auxiliary seat (2) and the base (1).

2. A steel pipe cutting device according to claim 1, characterized in that: The telescopic assembly comprises a first electric telescopic rod (4), the motor end of the first electric telescopic rod (4) is connected to the base (1), and the telescopic end of the first electric telescopic rod (4) is connected to the auxiliary seat (2).

3. A steel pipe cutting device according to claim 2, characterized in that: A storage groove (5) is provided on the side wall of the base (1); a first connecting block (6) is provided on the motor end of the first electric telescopic rod (4); the first connecting block (6) is slidably connected to the storage groove (5); the first electric telescopic rod (4) can be retracted and extended from the storage groove (5) through the sliding connection between the first connecting block (6) and the storage groove (5); a bearing (7) is embedded on the side wall of the auxiliary seat (2); and the telescopic end of the first electric telescopic rod (4) is connected to the bearing (7).

4. A steel pipe cutting device according to claim 3, characterized in that: A first thread (8) is provided on the side wall of the receiving groove (5) close to the notch position, and a second thread (9) is provided on the outer wall of the first connecting block (6). When the first connecting block (6) slides to the notch position of the receiving groove (5), the second thread (9) is screwed with the first thread (8) to be fixedly connected to the receiving groove (5).

5. The steel pipe cutting device according to claim 3, characterized in that: A connecting shaft (10) is arranged on the bottom wall of the storage groove (5), a fixing block (11) is arranged on the shaft wall of the connecting shaft (10), a connecting groove (12) is provided on the side wall of the first connecting block (6) away from the first electric telescopic rod (4), the connecting shaft (10) can be inserted into the connecting groove (12), a fixing groove (13) is provided on the groove side wall of the connecting groove (12), the notch position of the connecting groove (12) is connected with the fixing groove (13) by providing a connecting channel (14), and when the connecting shaft (10) is inserted into the connecting groove (12), the fixing block (11) can enter the connecting channel (14) and can enter the fixing groove (13) through the connecting channel (14).

6. A steel pipe cutting device according to claim 1, characterized in that: The support assembly comprises a positioning seat (15), a placement groove (16) arranged in a "V"-shaped structure is provided on the top surface of the positioning seat (15), symmetrically arranged rollers (17) are rotatably connected in the placement groove (16), and the rollers (17) on both sides are arranged in the form of wheel walls that movably extend out of the corresponding side inclined walls of the placement groove (16).

7. The steel pipe cutting device according to claim 1, characterized in that: The base (1) is provided with a stand (18), and a mounting groove (19) is provided on the stand (18). The grinding wheel saw body comprises a swing arm (20), and the swing arm (20) is movably mounted in the mounting groove (19) by means of a connecting shaft (21). A saw wheel (22) is provided on the end of the swing arm (20) close to the supporting component, and a pushing component is provided on the end of the swing arm (20) away from the saw wheel (22). The pushing component can push the swing arm (20) to move around the connecting shaft (21).

8. A steel pipe cutting device according to claim 7, characterized in that: The pushing assembly comprises a second electric telescopic rod (23), the motor end of the second electric telescopic rod (23) is movably connected to the base (1) by means of a hinge seat (24), a second connecting block (25) is arranged on the telescopic end of the second electric telescopic rod (23), a sliding pin (26) is passed through the second connecting block (25), a sliding groove (27) is provided on the end of the swing arm (20) away from the saw wheel (22), and the sliding pin (26) is slidably connected in the sliding groove (27).

9. A steel pipe cutting device according to claim 8, characterized in that: The stand (18) is also provided with a control panel (28), which is electrically connected to the telescopic component, the saw wheel (22) and the pushing component respectively, and the control panel (28) can control the working states of the telescopic component, the saw wheel (22) and the pushing component.

10. The steel pipe cutting device according to claim 1, characterized in that: The bottom surfaces of the base (1) and the auxiliary seat (2) are both provided with foot supports (29), wherein a threaded blind hole (30) is provided on the bottom surface of the auxiliary seat (2), and a third thread (31) is provided on the outer wall of the foot support (29) provided on the bottom surface of the auxiliary seat (2). The foot support (29) can be connected to the bottom surface of the auxiliary seat (2) by screwing the third thread (31) and the threaded blind hole (30). The inside of the foot support (29) is provided with a mounting column (33) movably penetrated by a mounting hole (32), and a pulley (34) is provided at the bottom of the mounting column (33). The outer wall of the mounting column (33) is provided with a threaded blind hole (30). A fourth thread (35) is provided, and a fifth thread (36) is provided on the inner wall of the foot support (29). The mounting column (33) can be connected to the mounting hole (32) by screwing the fourth thread (35) and the fifth thread (36). The spiral direction of the fourth thread (35) is set in the opposite direction to the spiral direction of the third thread (31). A special-shaped hole (37) is also provided on the top of the mounting column (33). A limiting column (38) that is movably inserted into the special-shaped hole (37) is provided on the bottom wall of the threaded blind hole (30). The shape of the limiting column (38) is adapted to the shape of the special-shaped hole (37).

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