Pipe cutting device for constructional engineering

Abstract

The pipe cutting device comprises an operation table, a clamping assembly is arranged on the left side of the upper end of the operation table, two mounting grooves are formed in the right side of the upper end of the operation table, and first electric push rods are fixed to the right side faces of the inner walls of the mounting grooves; a connecting plate is fixed to the output end of the first electric push rod, a clamping assembly is fixed to the upper end of the connecting plate, a cutting assembly is arranged at the upper end of the clamping assembly on the left side, and a grinding assembly is arranged at the upper end of the clamping assembly on the right side. According to the pipe cutting device for constructional engineering, the design of the grinding assembly is adopted, and a friction wheel and a friction strip are matched with each other, so that a grinding disc is tightly attached to a notch of a pipe, the grinding effect of the device is improved, and the notch of the pipe can be ground and deburred; operators do not need to polish the pipes independently, and operation of the device is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of pipe cutting, and in particular to a pipe cutting device for construction engineering. Background Art

[0002] With the development of society, more and more buildings are being built, and pipes, as a common building material in construction projects, are used more and more. Before using the pipes, they need to be cut into small sections of fixed length.

[0003] Chinese patent document CN114433938A discloses a pipe cutting device for construction engineering, including a workbench, the upper surface of the workbench is fixedly connected to a first vertical plate, one side of the first vertical plate is rotatably connected to a rotating disk, one side of the rotating disk is provided with three square through slots, all of the square through slots are slidably connected to sliding blocks, the sliding blocks and the side walls of the square through slots are fixedly connected to a first spring, one side of one of the sliding blocks is fixedly connected to a first cross bar, the first cross bar passes through the sliding block, one side of the first cross bar is fixedly connected to a first arc block, and the outer side of the first arc block is provided with an arc avoidance groove. The present invention provides a first arc block and a second arc block to support the metal pipe, thereby preventing the metal pipe from being deformed by the impact force of the cutting disk during cutting.

[0004] However, in actual use, the device cannot grind or remove burrs on the cut of the pipe, and requires separate manual grinding, which is inconvenient to operate the device, and cannot cut pipes of the same length in batches, resulting in relatively low work efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide a pipe cutting device for construction engineering, which can effectively solve the problems of inconvenient operation of the device and relatively low working efficiency.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A pipe cutting device for construction engineering comprises an operating table, wherein a clamping assembly is arranged on the left side of the upper end of the operating table, and two installation grooves are arranged on the right side of the upper end of the operating table. An electric push rod is fixed to the right side surface of the inner wall of the installation groove, and a connecting plate is fixed to the output end of the electric push rod. A clamping assembly is also fixed to the upper end of the connecting plate. A cutting assembly is arranged on the upper end of the clamping assembly on the left side, and a grinding assembly is arranged on the upper end of the clamping assembly on the right side.

[0007] Preferably, the clamping assembly includes a guide rail, two mounting plates 1 are provided at the upper end of the guide rail, a U-shaped support plate 1 is arranged in a front and rear array on the upper end of the mounting plate 1, a plurality of ball bearings are arranged on the inner surface of the U-shaped support plate 1, a baffle is fixed to the left side of the upper end of the mounting plate 1 located on the outer side, an electric push rod 2 is symmetrically arranged on the upper end of the inner mounting plate 1, a mounting plate 2 is commonly fixed to the upper ends of the two electric push rods 2, and a plurality of U-shaped support plates 2 are arranged in a front and rear array on the lower end of the mounting plate 2.

[0008] Preferably, the clamping assembly on the right side is symmetrically arranged with respect to the clamping assembly on the left side, the mounting plate 1 located on the outside is slidably connected to the guide rail, and the mounting plate 1 located on the inside is fixedly connected to the guide rail.

[0009] Preferably, the cutting assembly comprises a door-shaped bracket, the door-shaped bracket is fixed to an upper end of the mounting plate on the left side, and a cutting machine is slidably mounted on an outer surface of the mounting plate.

[0010] Preferably, the grinding assembly includes a mounting plate three, a plurality of grinding mechanisms are arranged at the lower end of the mounting plate three, two support rods are symmetrically fixed to the upper end of the mounting plate three, two support frames are fixed to the upper end of the mounting plate one on the right side, a limit switch is fixed at one end of the two support frames, and a motor one cooperating with the support rod is also fixed to the upper end of the mounting plate two.

[0011] Preferably, a guide rod is provided on a side of the two support rods that are close to each other and away from the mounting plate 3, and an arc groove that is adapted to the guide rod is opened at the left end of the support frame.

[0012] Preferably, the grinding mechanism includes a support frame fixed to the lower end of the mounting plate three, a friction wheel is rotatably installed on the inner surface of the support frame, a motor two connected to the friction wheel shaft is fixed to the upper end of the mounting plate three, and two friction strips matching the friction wheel are also slidably arranged in the inner cavity of the friction wheel, the two friction strips are respectively arranged on the front and rear sides of the friction wheel, the two friction strips are fixed with motor three at the ends away from each other, a grinding disc is fixed at the output end of motor three, a reset spring is also fixed to the end of the friction strip away from motor three, and the reset spring is fixedly connected to the side wall of the support frame.

[0013] Preferably, a groove is formed at one end of the grinding disc away from the motor three, and the cross-section of the groove is trapezoidal.

[0014] Preferably, the limit switch is connected to the circuit between the motor 2 and the motor 3.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This pipe cutting device adopts the design of grinding components. Through the cooperation between the friction wheel and the friction strip, the grinding disc and the cut of the pipe are tightly fitted, which improves the grinding effect of the device. In addition, by using the setting of the limit switch, the grinding disc can grind and remove the burrs of the cut of the pipe after the mounting plate is flipped three times. The operator does not need to grind the pipe separately, which facilitates the operation of the device.

[0016] 2. The pipe cutting device adopts the design of two clamping components. By adjusting the distance between the mounting plates on both sides, the device can be used to cut pipes of different lengths and can cut pipes of the same length in batches. There is no need to measure the cut part of the pipe separately, which improves the working efficiency of the device.

[0017] 3. The pipe cutting device adopts the design of clamping assembly, and the U-shaped support plate 2 cooperates with the U-shaped support plate 1 to clamp the pipe, preventing the pipe from sliding left or right or rotating when the device is in use, thereby affecting the normal cutting and grinding of the pipe, and increasing the stability of the device when in use.

[0018] 4. This pipe cutting device adopts a design that matches the guide rod with the arc groove. The arc groove is used to limit the guide rod to reduce the shaking caused by the movement of the support rod. It can also reduce the sliding caused by grinding, making the device more stable during grinding.

[0019] 5. The pipe cutting device adopts an arc groove with a trapezoidal groove, which enables the device to be suitable for pipes with different wall thicknesses when grinding the pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is an overall schematic diagram of the device for cutting pipes of the present invention; Figure 3 It is a structural schematic diagram of the guide rail part of the present invention; Figure 4 It is a schematic diagram of the structure of the clamping assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the grinding assembly of the present invention; Figure 6 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 7 It is a structural schematic diagram of the grinding mechanism of the present invention; Figure 8 It is a schematic diagram of the internal structure of the support frame of the present invention.

[0021] In the figure: 1. operating table; 2. clamping assembly; 3. cutting assembly; 4. grinding assembly; 11. mounting groove; 12. electric push rod 1; 13. connecting plate; 21. guide rail; 22. mounting plate 1; 23. U-shaped support plate 1; 24. ball bearing; 25. baffle; 26. electric push rod 2; 27. mounting plate 2; 28. U-shaped support plate 2; 31. door-shaped bracket; 32. cutting machine; 41. mounting plate 3; 42. grinding mechanism; 421. support frame; 422. friction wheel; 423. motor 2; 424. friction strip; 425. motor 3; 426. grinding disc; 427. reset spring; 43. support rod; 44. guide rod; 45. support frame; 46. arc groove; 47. limit switch; 48. motor 1. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] Embodiment 1 like Figure 1 - Figure 3 As shown, a pipe cutting device for construction engineering includes an operating table 1, and a clamping assembly 2 is arranged on the left side of the upper end of the operating table 1. The clamping assembly 2 is used to clamp the pipe to be cut, and can also be suitable for pipes of different lengths. Two installation grooves 11 are arranged on the right side of the upper end of the operating table 1, and an electric push rod 12 is fixed to the right side of the inner wall of the installation groove 11. A connecting plate 13 is fixed to the output end of the electric push rod 12, so that the connecting plate 13 can move left and right when the output ends of the two electric push rods 12 are extended or retracted. The clamping assembly 2 is also fixed to the upper end of the connecting plate 13, and a cutting assembly 3 is arranged on the upper end of the clamping assembly 2 on the left, and a grinding assembly 4 is arranged on the upper end of the clamping assembly 2 on the right.

[0024] like Figure 2 - Figure 4 As shown, the clamping assembly 2 includes a guide rail 21, and two mounting plates 22 are arranged on the upper end of the guide rail 21. A U-shaped support plate 23 is arranged in a front and rear array on the upper end of the mounting plate 22. A plurality of balls 24 are arranged on the inner surface of the U-shaped support plate 23. Among them, the balls 24 are prior art and can reduce the friction between the U-shaped support plate 23 and the pipe, so as to facilitate the transmission and rotation of the pipe. A baffle 25 is fixed on the left side of the upper end of the outer mounting plate 22. The baffle 25 is used to push one side of the ball 24 in the pipe to move, so as to achieve the purpose of cutting the pipe to be cut. An electric push rod 26 is symmetrically arranged on the upper end of the inner mounting plate 22. A mounting plate 27 is fixed on the upper ends of the two electric push rods 26, so that the output ends of the two electric push rods 26 can drive the mounting plate 27 to move upward or downward when they are extended or retracted. A plurality of U-shaped support plates 28 are arranged in a front and rear array on the lower end of the mounting plate 27.

[0025] Since the ball bearing 24 is not provided at the lower end of the U-shaped support plate 28, when the output end of the electric push rod 26 contracts, the U-shaped support plate 28 cooperates with the U-shaped support plate 1 23 to clamp the pipe, preventing the pipe from sliding left or right or rotating when the device is in use, thereby affecting the normal cutting and grinding of the pipe, and increasing the stability of the device when in use.

[0026] In addition, the clamping assembly 2 on the right is symmetrically arranged with the clamping assembly 2 on the left, the mounting plate 22 on the outside is slidably connected to the guide rail 21, and the mounting plate 22 on the inside is fixedly connected to the guide rail 21, wherein the clamping assembly 2 on the left is used to transport the pipe to be cut, and the clamping assembly 2 on the right is used to support the pipe after cutting, and the gap between the two clamping assemblies 2 is reserved for the blade of the cutting machine 32 to facilitate the cutting of the pipe by the cutting machine 32. Due to the design of the baffle 25, when the leftmost mounting plate 22 moves to the right, the pipe to be cut can be pushed to the right. When the pipe needs to be transported, it is only necessary to push the leftmost mounting plate 22 to move to the right, and the baffle 25 will push the pipe above the mounting plate 22 to move to the right, thereby achieving the purpose of conveying the pipe; Due to the setting of the U-shaped support plate 23 on the right side, when the pipe is transported to the rightmost side, the U-shaped support plate 23 on the right side can block the transported pipe, thereby achieving the purpose of limiting the pipe, and when the device is in use, the distance between the two mounting plates 22 on the right side can be adjusted to achieve the purpose of adjusting the pipe cutting length, so that the device can be suitable for cutting pipes of different lengths when in use.

[0027] like Figure 2 As shown, the cutting assembly 3 includes a door-shaped bracket 31, which is fixed to the upper end of the mounting plate 22 on the left side. A cutter 32 is slidably installed on the outer surface of the mounting plate 22, so that the cutter 32 can slide back and forth to cut the pipe. When setting the mounting plate 22, attention should be paid to the initial position of the cutter 32 to prevent the blade of the cutter 32 from affecting the smooth transportation of the pipe during transportation [that is, the blade of the cutter 32 blocks the transportation route of the pipe].

[0028] The specific implementation of this embodiment is as follows: when the device is in use, the pipe to be cut is first placed on the two U-shaped support plates 23 on the left, and the position of the pipe is adjusted so that the left side of the pipe contacts the baffle 25, and the distance between the two mounting plates 22 on the right is adjusted. Due to the setting of the baffle 25 on the right, the distance between the blade of the cutting machine 32 and the baffle 25 can be adjusted, thereby adjusting the length of the pipe cut; When the leftmost mounting plate 22 moves to the right, the baffle plate 25 on the left pushes the pipe on the U-shaped support plate 23 to move to the right. When the pipe contacts the baffle plate 25 on the right, the movement of the leftmost mounting plate 22 is stopped [at this time, the length of the pipe to be cut has been determined], and then the output ends of the multiple electric push rods 26 are controlled to contract. When the output ends of the electric push rods 26 contract, the mounting plate 27 is driven to move downward. Since the inner surface of the U-shaped support plate 28 is not provided with a ball bearing 24, the U-shaped support plate 28 cooperates with the U-shaped support plate 23 to clamp the pipe on the U-shaped support plate 23, preventing the cutting machine 32 from shifting or rotating when cutting the pipe, which can increase the stability of the device when in use; Then, turn on the cutting machine 32 and push the cutting machine 32 to move forward and backward. The blade of the cutting machine 32 will cut the pipe during operation. After the cutting is completed, push the cutting machine 32 back to the initial position and control the output end of the electric push rod 12 to retract. When the output end of the electric push rod 12 retracts, it will drive the clamping assembly 2 on the right to move to the right, leaving a gap at the cut of the pipe to facilitate the grinding assembly 4 to grind and remove burrs on the cut of the pipe.

[0029] Embodiment 2 This embodiment is a further improvement on the grinding assembly 4 based on the first embodiment, so that the device can perform grinding and burr removal operations on the cut of the pipe when in use.

[0030] like Figure 5 and Figure 6 As shown, the grinding assembly 4 includes a mounting plate 3 41, and a plurality of grinding mechanisms 42 are arranged at the lower end of the mounting plate 3 41, wherein the mounting plate 3 41 is used for the installation of the plurality of grinding mechanisms 42, and can drive the plurality of grinding mechanisms 42 to move at the same time, so as to facilitate the plurality of grinding mechanisms 42 to grind the cuts of a plurality of pipes at the same time, and two support rods 43 are symmetrically fixed to the upper end of the mounting plate 3 41, and two support frames 45 are fixed to the upper end of the mounting plate 1 22 on the right side, and the two support frames 45 are fixed with limit switches 47 at the ends close to each other, and a motor 1 48 cooperating with the support rod 43 is also fixed to the upper end of the mounting plate 2 27, and the output shaft of the motor 1 48 needs to coincide with the axis of the arc groove 46 during installation, so that the output end of the motor 1 48 can allow the guide rod 44 to slide in the arc groove 46 when working, and allow the mounting plate 3 41 and the support rod 43 to rotate with the output shaft of the motor 1 48 as the center axis, so as to prevent the grinding mechanism 42 from hindering the cutting of the cutting machine 32.

[0031] In addition, a guide rod 44 is provided on the side of the two support rods 43 that are close to each other and away from the mounting plate 41. An arc groove 46 that is compatible with the guide rod 44 is opened at the left end of the support frame 45. The guide rod 44 slides in the arc groove 46, and the arc groove 46 limits the guide rod 44, thereby reducing the shaking generated during the movement of the support rod 43 and making the device more stable when used.

[0032] like Figure 7 and Figure 8 As shown, the grinding mechanism 42 includes a support frame 421 fixed to the lower end of the mounting plate three 41, so that when the mounting plate three 41 rotates with the output shaft of the motor one 48 as the center axis, the support frame 421 will also rotate with the output shaft of the motor one 48 as the center axis, and a friction wheel 422 is rotatably installed on the inner surface of the support frame 421, and a motor two 423 connected to the shaft of the friction wheel 422 is fixed to the upper end of the mounting plate three 41. There are also two friction strips 424 slidingly arranged in the inner cavity of the friction wheel 422 that cooperate with the friction wheel 422. The two friction strips 424 are respectively arranged on the front and rear sides of the friction wheel 422, so that when the friction wheel 422 rotates, the two friction strips 424 can move in opposite directions.

[0033] In addition, motor three 425 is fixed to the ends of the two friction strips 424 away from each other, and a grinding disc 426 is fixed to the output end of motor three 425. A groove is provided at the end of the grinding disc 426 away from motor three 425, and the groove rubs against one end of the pipe, thereby grinding and deburring the pipe. A return spring 427 is also fixed to the end of the friction strip 424 away from motor three 425, and the return spring 427 is fixedly connected to the side wall of the support frame 421. When the two friction strips 424 move toward the side away from each other, the return spring 427 is stretched under the condition of external force. When motor two 423 stops working, the two friction strips 424 move toward the side close to each other under the elastic action of the return spring 427, thereby allowing the friction strips 424 to return to their original positions, facilitating the next use of the device.

[0034] When the motor 2 423 is working, it drives the friction wheel 422 to rotate. The friction wheel 422 meshes with the two friction strips 424, allowing the two friction strips 424 to move in opposite directions, thereby allowing the two grinding discs 426 to move away from each other, so that the grinding discs 426 are in contact with the pipe. Due to the friction between the friction wheel 422 and the friction strips 424, when the grinding disc 426 is in contact with the pipe, the friction wheel 422 and the friction strips 424 slip, allowing the grinding disc 426 to fit tightly with the cut of the pipe, thereby facilitating the grinding of the cut of the pipe.

[0035] like Figure 5 and Figure 7As shown, the cross section of the groove is trapezoidal, so that the grinding disc 426 can grind the inner and outer walls of the pipe cut to improve the grinding effect of the device, and the trapezoidal groove can be suitable for pipes with different wall thicknesses, improving the applicability of the device when used.

[0036] In addition, the limit switch 47 is connected to the circuit of the motor 2 423 and the motor 3 425. Due to the design of the limit switch 47, when the mounting plate 3 41 is rotated from a vertical state to a horizontal state, the guide rod 44 will press the limit switch 47, so that the limit switch 47 is in a closed state. The other end of the limit switch 47 is connected to the power supply, so that the motor 2 423 and the motor 3 425 are powered on and can work. When the mounting plate 3 41 is rotated from a horizontal state to a vertical state, a spring is designed inside the limit switch 47, so that the switch of the limit switch 47 is reset to an open state. Due to the design of the reset spring 427, the two friction strips 424 can be reset, which is convenient for the next use of the device.

[0037] When the motor 3 425 is working, it drives the grinding disc 426 to rotate, so that the grinding disc 426 can grind and remove burrs on the cut of the pipe, making it easier to use the pipe.

[0038] The specific implementation of this embodiment is as follows: after the cutting machine 32 completes cutting of the pipe, the output end of the electric push rod 12 shrinks, and the output end of the electric push rod 12 shrinks, which drives the clamping assembly 2 on the right to move to the right, leaving a gap at the cut of the pipe, and then the motor 1 48 works, so that the mounting plate 3 41 rotates from a vertical state to a horizontal state; When the mounting plate 3 41 is in a horizontal state, the limit switch 47 is pressed, and the limit switch 47 is closed, so that the motor 2 423 and the motor 3 425 work. When the motor 2 423 works, the friction between the friction wheel 422 and the friction strip 424 causes the two friction strips 424 to move away from each other, and the two grinding discs 426 come into contact with the pipe. Under the action of the friction force between the friction strip 424 and the friction wheel 422, the grinding discs 426 fit tightly, thereby grinding the cut of the pipe. After grinding is completed, motor 1 48 rotates in the opposite direction, so that mounting plate 3 41 changes from a horizontal state to a vertical state. At this time, limit switch 47 is disconnected without being pressed, so that motor 2 423 and motor 3 425 stop working. Due to the design of reset spring 427, after motor 2 423 stops working, the two friction strips 424 move toward each other, so that the grinding disc 426 does not contact the pipe, which facilitates the rotation of mounting plate 3 41 and the next use of the device.

[0039] It should be noted that the specific installation methods, circuit connection methods and control methods of the electric push rod, ball 24 and motor, limit switch 47, etc. in the present invention are all conventional designs and will not be elaborated in detail in the present invention.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pipe cutting device for construction engineering, comprising an operating table (1), characterized in that: A clamping assembly (2) is arranged on the left side of the upper end of the operating table (1), and two installation grooves (11) are arranged on the right side of the upper end of the operating table (1). An electric push rod (12) is fixed to the right side of the inner wall of the installation groove (11), and a connecting plate (13) is fixed to the output end of the electric push rod (12), and a clamping assembly (2) is also fixed to the upper end of the connecting plate (13). A cutting assembly (3) is arranged on the upper end of the left clamping assembly (2), and a grinding assembly (4) is arranged on the upper end of the right clamping assembly (2).

2. A pipe cutting device for construction engineering according to claim 1, characterized in that: The clamping assembly (2) comprises a guide rail (21), two mounting plates (22) are arranged at the upper end of the guide rail (21), a U-shaped support plate (23) is arranged in a front and rear array at the upper end of the mounting plate (22), a plurality of balls (24) are arranged on the inner surface of the U-shaped support plate (23), a baffle (25) is fixed to the left side of the upper end of the mounting plate (22) located on the outer side, an electric push rod (26) is symmetrically arranged at the upper end of the mounting plate (22) on the inner side, a mounting plate (27) is commonly fixed to the upper ends of the two electric push rods (26), and a plurality of U-shaped support plates (28) are arranged in a front and rear array at the lower end of the mounting plate (27).

3. A pipe cutting device for construction engineering according to claim 2, characterized in that: The clamping assembly (2) on the right side is symmetrically arranged with the clamping assembly (2) on the left side; the mounting plate (22) located on the outside is slidably connected to the guide rail (21); and the mounting plate (22) located on the inside is fixedly connected to the guide rail (21).

4. A pipe cutting device for construction engineering according to claim 2, characterized in that: The cutting assembly (3) comprises a door-shaped bracket (31), the door-shaped bracket (31) being fixed to the upper end of the mounting plate 1 (22) on the left side, and a cutting machine (32) being slidably mounted on the outer surface of the mounting plate 1 (22).

5. A pipe cutting device for construction engineering according to claim 2, characterized in that: The grinding assembly (4) comprises a mounting plate three (41), a plurality of grinding mechanisms (42) being arranged at the lower end of the mounting plate three (41), two support rods (43) being symmetrically fixed to the upper end of the mounting plate three (41), two support frames (45) being fixed to the upper end of the mounting plate one (22) on the right side, a limit switch (47) being fixed at one end of each of the two support frames (45), and a motor one (48) cooperating with the support rod (43) being also fixed to the upper end of the mounting plate two (27).

6. A pipe cutting device for construction engineering according to claim 5, characterized in that: A guide rod (44) is provided on the side of the two support rods (43) that are close to each other and away from the mounting plate three (41), and an arc groove (46) that is compatible with the guide rod (44) is opened at the left end of the support frame (45).

7. A pipe cutting device for construction engineering according to claim 5, characterized in that: The grinding mechanism (42) comprises a support frame (421) fixed to the lower end of the third mounting plate (41); a friction wheel (422) is rotatably mounted on the inner surface of the support frame (421); a second motor (423) connected to the shaft of the friction wheel (422) is fixed to the upper end of the third mounting plate (41); two friction strips (424) cooperating with the friction wheel (422) are also slidably mounted in the inner cavity of the friction wheel (422); the two friction strips (424) are respectively arranged at the front and rear sides of the friction wheel (422); the two friction strips (424) are fixed to the ends of the two friction strips (424) away from each other with the third motor (425); a grinding disc (426) is fixed to the output end of the third motor (425); a return spring (427) is also fixed to the end of the friction strip (424) away from the third motor (425); and the return spring (427) is fixedly connected to the side wall of the support frame (421).

8. A pipe cutting device for construction engineering according to claim 7, characterized in that: The end of the grinding disc (426) away from the motor three (425) is provided with a groove, and the cross section of the groove is trapezoidal.

9. A pipe cutting device for construction engineering according to claim 7, characterized in that: The limit switch (47) is connected to the second motor (423) and the third motor (425) in an electrical circuit.

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