A water pipe cutting machine for water conservancy projects

Abstract

The present invention relates to the technical field of water pipe cutting, and specifically to a water pipe cutting machine for water conservancy projects; it comprises a base with an inverted U-shaped cross-section and an arc-shaped knife holder; the base is arranged to be arc-shaped on one side in contact with the outer wall of the pipe; the base is fixedly connected to two base plates away from the outer wall of the pipe; an upper roller and a lower roller are rotatably connected between the two base plates; the base plate at the front is rotatably connected to a front turntable; a front groove is provided on the rear side of the front turntable; the cross-sections of both ends of the upper roller are arranged to be square and can be stuck in the front groove; the present invention controls the left double rope and the right double rope to pull the knife holder back and forth around the outer wall of the pipe, thereby being able to cut the pipe in a narrow space, and the entire cutting process is gradual, and the incision is smoother; in addition, the present invention can also adapt to pipes of different diameters at the same time, and has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of water pipe cutting, in particular to a water pipe cutting machine for water conservancy projects. Background Art

[0002] Water conservancy projects are constructed to control and allocate natural surface water and groundwater to achieve the goal of eliminating harm and promoting benefits. Water conservancy projects are built to control water flows, prevent floods, and regulate and distribute water to meet the water resource needs of people's lives and production. Water conservancy projects require the construction of various hydraulic structures such as dams, dikes, spillways, sluices, inlets, channels, ferries, rafts, and fishways to achieve their goals. When installing plastic water pipes for water conservancy projects, pipe lengths vary, and the pipes need to be cut to the appropriate length before installation.

[0003] The diameter of water pipes in water conservancy projects is generally large, and manual cutting is time-consuming and labor-intensive. Therefore, professional cutting devices are required for cutting water pipes. Relevant cutting devices are disclosed on the market, such as self-climbing hydraulic pipe cutting machines, and relevant patents also disclose such pipe cutting machines, such as CN210280858U-hydraulic self-climbing pipe cutting machine. The working principle of this pipe cutting machine is to first wrap a guide rail such as a chain around the outer wall of the pipe, and then after tightening the chain, control the pipe cutting machine to move circumferentially along the chain and around the pipe to complete the pipe cutting process. During the installation of water pipes in water conservancy projects, the water pipes are located in the excavated pipe trench. The space between the inner wall of the pipe trench and the outer wall of the water pipe is limited, making it difficult for the pipe cutting machine to move around the pipe. Therefore, this pipe cutting machine can only be used for cutting suspended water pipes or some water pipes with ample surrounding space.

[0004] Another type of cutting device available on the market is a flap-type circular cutting and beveling machine; related patents also disclose such a cutting device, such as CN204657650U-Flap-type circular cutting and beveling machine. The working principle of this cutting device is to first fix the flap assembly to the outer wall of the pipe, and then control the cutter to cut around the outer wall of the pipe along the arc-shaped tool holder. Compared with the pipe cutting machine cutting around the outer wall of the pipe, this arc-shaped tool holder is smaller in size and can meet the needs of some water pipe cutting with limited surrounding space. However, due to the limitation of the flap in the structure, the applicable pipe diameter range of this cutting device is limited, and its versatility is limited.

[0005] In addition, the rope saw type pipe cutting machine disclosed on the market has strong versatility, but it can only be used for hard pipes such as concrete or metal. When cutting plastic water pipes, it has defects such as low cutting efficiency and rough and incomplete cuts. Summary of the Invention

[0006] In order to make up for the shortcomings of the existing technology, the present invention proposes a water pipe cutting machine for water conservancy projects. The present invention controls the left double rope and the right double rope to pull the knife holder back and forth around the outer wall of the pipe, so that the pipe can be cut in a narrow space. The entire cutting process is gradual and the incision is smoother. In addition, the present invention can also adapt to pipes of different diameters at the same time, and has a wide range of applications.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: a water pipe cutting machine for water conservancy projects according to the present invention comprises a base with an inverted U-shaped cross section and an arc-shaped knife seat; the base is arranged to be arc-shaped on a side contacting the outer wall of the pipe; the base is fixedly connected to two base plates away from the outer wall of the pipe; an upper roller and a lower roller are rotatably connected between the two base plates; the base at the front position is rotatably connected to a front turntable; a front groove is provided on the rear side of the front turntable; the cross sections of both ends of the upper roller are arranged to be square and can be stuck in the front groove; the front side of the front turntable is fixedly connected to an upper gear; the front end of the lower roller is fixedly connected to a lower gear meshing with the upper gear; the upper gear is driven by a motor; a knife groove is provided on the inner side of the knife seat; a cutting knife is elastically slidably connected in the knife groove; a rope groove is provided on the outer side of the knife seat; the upper roller is connected to an end of the rope groove near the middle of the knife seat by a left double rope; the lower roller is connected to an end of the rope groove near the middle of the knife seat by a right double rope.

[0008] Preferably, a knife plate is slidably connected in the knife groove; the knife plate is connected to the bottom of the knife groove through a first spring; the side of the knife plate away from the first spring is fixedly connected to the cutter; and the ends of the knife seat are fixedly connected to the earth-breaking knife.

[0009] Preferably, an operating groove is provided on the left side of the base plate; a tensioning groove is provided on the side of the base close to the pipe; a tensioning plate is slidably connected in the tensioning groove; a bolt is threadedly connected between the operating groove and the inside of the tensioning groove; the bolt is rotatably connected to the tensioning plate; and a handle is fixed to the rear side of the base plate at the rear position.

[0010] Preferably, the base is provided with two left limit slots on the left side; the left double rope passes through the corresponding left limit slots; the base is provided with two right limit slots on the right side; the right double rope passes through the corresponding right limit slot.

[0011] Preferably, the front and rear inner walls of the left limit groove and the right limit groove are provided with scraping grooves; a scraping block is slidably connected in the scraping groove; the scraping block is connected to the bottom of the scraping groove through a second spring; the scraping block is set into a hemispherical shape at one end away from the bottom of the scraping groove.

[0012] Preferably, an avoidance groove is provided on the front side of the rear base plate; a circular groove is provided on the rear side of the avoidance groove; a circular disc is movably connected in the circular groove; the circular disc is pressed against the bottom of the circular groove through a third spring; the circular disc corresponds to the front turntable in the front-to-back direction.

[0013] Preferably, a rear groove corresponding to the end of the upper roller is provided on the front side of the disc.

[0014] Preferably, the blade plate is connected to the blade groove in a sliding seal; a drive groove is provided on the outside of the blade seat; the drive groove is connected to the drive plate in a sliding seal; the drive plate is connected to the bottom of the drive groove through a fourth spring; the outer side surface of the drive plate is fixedly connected to a drive plate with a triangular cross-section; a one-way air inlet is provided through the drive plate and the drive plate; the drive groove and the blade groove are connected through a one-way air outlet.

[0015] Preferably, pressure relief holes are provided on the front and rear sides of the knife holder; a pressure relief rod is movably sealed and connected in the pressure relief hole; an annular groove is provided in the middle of the pressure relief rod; the middle of the pressure relief hole is connected to the bottom of the knife groove through a connecting hole; a first magnet is embedded in the end of the pressure relief rod; a second magnet corresponding to the first magnet is embedded in the inner wall of the pressure relief hole; the first magnet and the second magnet are magnetically attracted to each other.

[0016] Preferably, there are two driving grooves; the two driving grooves are arranged near the corresponding ends of the tool holder.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention controls the left double rope and the right double rope to pull the knife holder to move back and forth around the outer wall of the pipe, thereby being able to cut the pipe in a narrow space. The entire cutting process is gradual and the incision is smoother. In addition, the present invention can also adapt to pipes of different diameters at the same time, and has a wide range of applications.

[0019] 2. In the present invention, the dirt and other materials on the surface of the left double rope in the left limit groove and the right double rope in the right limit groove are scraped off by the scraping block, so that the left double rope and the right double rope are cleaned, thereby preventing the dirt from affecting the winding and improving the smoothness of the winding of the left double rope and the right double rope.

[0020] 3. In the present invention, each time the knife holder moves around the pipe in a circle, the cutting force and depth of the cutter on the pipe are increased, so that the process of the cutter cutting the pipe is gradual, thereby improving the pipe cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 It is a three-dimensional diagram of the present invention enclosed outside the tube body;

[0023] Figure 2 It is a perspective view of the present invention;

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0026] Figure 5 yes Figure 2 A three-dimensional image from another angle;

[0027] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0028] Figure 7 It is a position diagram of the tensioning groove in the present invention;

[0029] Figure 8 It is a perspective view of the left double rope and the right double rope in the present invention;

[0030] Figure 9 It is a three-dimensional diagram of the upper roller in the present invention;

[0031] Figure 10 It is a three-dimensional diagram of the driving plate and the blade plate of the present invention;

[0032] Figure 11 It is a three-dimensional diagram of the blade and the cutting knife in the present invention;

[0033] Figure 12 is a cross-sectional view of the tool holder of the present invention;

[0034] Figure 13 yes Figure 12 Enlarged view of point D in the middle;

[0035] Figure 14 yes Figure 12 Enlarged view of point E in the middle;

[0036] Figure 15 is a position diagram of the first magnet and the second magnet in the present invention;

[0037] Figure 16 It is a cross-sectional view of the scraping groove in the present invention.

[0038] In the figure: base 1, tensioning groove 11, tensioning plate 12, bolt 13, left limit groove 14, right limit groove 15, scraping groove 16, scraping block 17, second spring 18, knife holder 2, knife groove 21, cutter 22, rope groove 23, knife plate 24, first spring 25, earth-breaking knife 26, drive groove 27, pressure relief hole 28, connecting hole 29, base plate 3, front turntable 31, front groove 32, upper gear 33, motor 34, operating groove 35, handle 36, avoidance groove 37, circular groove 38, upper roller 4, left double rope 41, lower roller 5, lower gear 51, right double rope 52, disc 6, third spring 61, rear groove 62, drive plate 7, fourth spring 71, drive plate 72, one-way air inlet 73, one-way air outlet 74, pressure relief rod 8, annular groove 81, first magnet 82, second magnet 83. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0040] like Figures 1 to 16 As shown, the present invention includes the following embodiments:

[0041] Example 1: A water pipe cutting machine for water conservancy projects, comprising a base 1 with an inverted U-shaped cross section and an arc-shaped knife seat 2; the base 1 is configured to have an arc-shaped surface in contact with the outer wall of the pipe; the base 1 is fixedly connected to two base plates 3 away from the outer wall of the pipe; an upper roller 4 and a lower roller 5 are rotatably connected between the two base plates 3; the base plate 3 at the front position is rotatably connected to a front turntable 31; a front groove 32 is provided on the rear side of the front turntable 31; the cross sections of both ends of the upper roller 4 are configured to be square and can be stuck in the front groove 32; the front of the front turntable 31 The side is fixedly connected to the upper gear 33; the front end of the lower roller 5 is fixedly connected to the lower gear 51 meshing with the upper gear 33; the upper gear 33 is driven by the motor 34; a knife groove 21 is provided on the inner side of the knife holder 2; the cutter 22 is elastically and slidably connected in the knife groove 21; a rope groove 23 is provided on the outer side of the knife holder 2; the upper roller 4 is connected to the rope groove 23 at one end near the middle of the knife holder 2 through the left double rope 41; the lower roller 5 is connected to the rope groove 23 at one end near the middle of the knife holder 2 through the right double rope 52; the end of the cutter 22 is tilted away from the pipe.

[0042] In this embodiment, the knife groove 21 is slidably connected to the knife plate 24; the knife plate 24 is connected to the bottom of the knife groove 21 through the first spring 25; the side of the knife plate 24 away from the first spring 25 is fixedly connected to the cutter 22; and the ends of the knife seat 2 are fixedly connected to the earth-breaking knife 26.

[0043] When it is necessary to cut the pipe, the pipe cutting position is determined first. After determining that the winding direction of the left double rope 41 on the upper roller 4 is opposite to the winding direction of the right double rope 52 on the lower roller 5, the motor 34 is controlled to rotate in the opposite direction. The outer wall of the motor 34 is fixedly connected to the front side of the base plate 3 at the front position. During the rotation of the motor 34, the upper gear 33 fixedly connected to the output shaft is driven to rotate. During the rotation of the upper gear 33, the meshed lower gear 51 is driven to rotate. The rotation direction of the lower gear 51 is opposite to that of the upper gear 33. During the rotation of the upper gear 33, the front turntable 31 is driven to rotate. During the rotation of the front turntable 31, the upper roller 4 inserted into the front slot 32 is driven to rotate. During the rotation of the upper roller 4 The left double rope 41 will be unwound, and the rotation of the lower gear 51 will drive the lower roller 5 to rotate. The right double rope 52 will be unwound during the rotation of the lower roller 5. After the left double rope 41 and the right double rope 52 are unwound, they can be used for cutting pipes with larger diameters, which is also convenient for the left double rope 41 and the right double rope 52 to enclose the pipe. Then the end of the upper roller 4 is taken out from the front groove 32, and then the upper roller 4 is controlled to the right side of the pipe and bypass the bottom of the pipe to enter the left side of the pipe. Then the end of the upper roller 4 is reinserted into the front groove 32. It should be noted that before the end of the upper roller 4 is inserted into the front groove 32, it is first determined that the winding direction of the left double rope 41 on the upper roller 4 is opposite to the winding direction of the right double rope 52 on the lower roller 5. Control The motor 34 is controlled to rotate forward, so that the upper roller 4 reels the left double rope 41 and the lower roller 5 reels the right double rope 52. During the reeling process of the left and right double ropes 41 and 52, the knife seat 2 will be pulled, and the knife seat 2 will move close to the pipe. The cutter 22 is pressed to overcome the elastic force of the first spring 25 and drive the knife plate 24 close to the bottom of the knife groove 21 until the cutter 22 is retracted into the knife groove 21. Then the end of the upper roller 4 is pulled out from the front groove 32, and the end of the upper roller 4 is replaced and reinserted. In this way, the winding direction of the left double rope 41 of the upper roller 4 is the same as the winding direction of the right double rope 52 of the lower roller 5. Then the motor 34 is controlled to rotate forward and reverse back and forth. During the forward rotation of the motor 34, the upper roller 4 is driven The roller 4 unwinds the left double rope 41, and the motor 34 rotates forward to drive the lower roller 5 to rewind the right double rope 52. In the process of rewinding and releasing, the knife holder 2 moves counterclockwise around the pipe, and the first spring 25 inside the knife holder 2 transmits the elastic force to the knife plate 24, and the knife plate 24 transmits the elastic force to the cutter 22, so that the cutter 22 rests on the outer wall of the pipe. In the process of the knife holder 2 moving counterclockwise around the pipe, the knife holder 2 drives the cutter 22 to scrape the outer wall of the pipe, so that the outer wall of the pipe is cut. Since the right double rope 52 is connected to the outside of the knife holder 2 near the middle position, the end of the knife holder 2 will enter the inner side of the base 1 under the pull of the right double rope 52;Then the motor 34 is controlled to rotate in the opposite direction, the upper roller 4 will reel in the left double rope 41, and the lower roller 5 will unwind the right double rope 52. In the case of reeling and unwinding, the knife seat 2 will move clockwise around the pipe, and the knife seat 2 will drive the cutter 22 to cut the pipe clockwise. The knife seat 2 is arc-shaped, and the knife seat 2 will drive the end to enter the inner side of the base 1 when it is pulled down. The knife seat 2 drives the arc-shaped cutter 22 to form a complete cutting ring on the outer wall of the pipe. As the motor 34 rotates back and forth repeatedly, the knife seat 2 will drive The cutter 22 moves back and forth around the pipe, and the first spring 25 drives the cutter 22 to always press against the outer wall of the pipe until the pipe is cut. As the cutter holder 2 moves circumferentially around the pipe, the cutter holder 2 drives the soil-breaking blade 26 at its end to break up the surrounding soil to prevent the soil from affecting the movement of the cutter holder 2. The cutter holder 2 is small in size, making it suitable for use in narrow spaces. The left double rope 41 and the right double rope 52 press the cutter holder 2 against the outer wall of the pipe to ensure the pressure of the cutter holder 2 on the pipe.

[0044] The present invention controls the left double rope 41 and the right double rope 52 to pull the knife holder 2 back and forth around the outer wall of the pipe, thereby being able to cut the pipe in a narrow space, and the entire cutting process is gradual, and the incision is smoother; in addition, the present invention can also adapt to pipes of different diameters at the same time, and has a wide range of applications.

[0045] Example 2: An operating groove 35 is provided on the left side of the base plate 3; a tensioning groove 11 is provided on the side of the base 1 close to the pipe; a tensioning plate 12 is slidably connected to the tensioning groove 11; a bolt 13 is threadedly connected between the operating groove 35 and the inside of the tensioning groove 11; the bolt 13 is rotatably connected to the tensioning plate 12; a handle 36 is fixed to the rear side of the base plate 3 at the rear position.

[0046] When the motor 34 rotates to drive the upper roller 4 to reel in the left double rope 41 and the lower roller 5 to reel in the right double rope 52, a clearance is reserved for the upper roller 4 connected to the left double rope 41 to facilitate the removal of the end of the upper roller 4 from the front groove 32. The upper roller 4 will control the other end to reinsert into the front groove 32 to ensure that the winding direction of the upper roller 4 and the left double rope 41 is consistent with the winding direction of the lower roller 5 and the right double rope 52. Then, the bolt 13 is tightened to drive the tensioning plate 12 to move down along the tensioning groove 11. When the tool 10 is moved, the tensioning plate 12 will be against the outer wall of the pipe and will move away from the bottom of the tensioning groove 11, thereby further tightening the left double rope 41 and the right double rope 52, thereby ensuring the pressing force of the left double rope 41 and the right double rope 52 on the knife holder 2, so that the cutting force of the outer wall of the pipe driven by the knife holder 2 is improved; the knife holder 2 under tension is more adapted to the outer wall of the pipe, and under the guidance of the left double rope 41 and the right double rope 52, the knife holder 2 is more stably moved circumferentially around the pipe.

[0047] Example 3: The base 1 is provided with two left limit slots 14 on the left side; the left double rope 41 passes through the corresponding left limit slot 14; the base 1 is provided with two right limit slots 15 on the right side; the right double rope 52 passes through the corresponding right limit slot 15.

[0048] In this embodiment, a scraping groove 16 is provided on the front and rear inner walls of the left limit groove 14 and the right limit groove 15; a scraping block 17 is slidably connected in the scraping groove 16; the scraping block 17 is connected to the bottom of the scraping groove 16 through a second spring 18; the scraping block 17 is set to be hemispherical at one end away from the bottom of the scraping groove 16.

[0049] During the back and forth rotation of the upper roller 4 and the lower roller 5, the left double rope 41 and the right double rope 52 will be retracted and released, so that the knife seat 2 can drive the outer wall of the blade pipe to cut. The left double rope 41 is the two ropes on the left side. The left double rope 41 will pass through the left limiting groove 14 and move in the left limiting groove 14. The scraper block 17 in the left limiting groove 14 is pressed against the outer wall of the left double rope 41 under the elastic force of the second spring 18. In the process of the left double rope 41 being wound, the dirt and other materials on the surface of the left double rope 41 are scraped off by the scraper block 17 to clean the left double rope 41, thereby avoiding the influence of dirt on the winding, improving the smoothness of the winding of the left double rope 41, and the residual dirt and other materials on the inside of the base 1 will enter with the knife seat 2. be pushed out; the left double rope 41 can be moved out of the left limit groove 14 along with the upper roller 4, and the scraper block 17 is set into a hemispherical shape at one end away from the bottom of the scraper groove 16, so that the scraper block 17 is pressurized to overcome the second spring 18 and retract into the scraper groove 16, and the scraper block 17 is pushed back to its original position by the second spring 18 after the left double rope 41 is moved away; similarly, the right double rope 52 is two ropes positioned on the right, and the right double rope 52 will pass through the right limit groove 15 and move in the right limit groove 15. The scraper block 17 in the right limit groove 15 is pressed against the outer wall of the right double rope 52 under the elastic force of the second spring 18. In the process of the right double rope 52 being wound up, the dirt and other materials on the surface of the right double rope 52 are scraped off by the corresponding scraper block 17, thereby cleaning the right double rope 52.

[0050] Example 4: An avoidance groove 37 is provided on the front side of the rear base plate 3; a circular groove 38 is provided on the rear side of the avoidance groove 37; a disc 6 is movably connected in the circular groove 38; the disc 6 is pressed against the bottom of the circular groove 38 through a third spring 61; the disc 6 corresponds to the front turntable 31 in the front-to-back direction.

[0051] In this embodiment, a rear groove 62 corresponding to the end of the upper roller 4 is provided on the front side of the disc 6 .

[0052] Before inserting the upper roller 4 between the front and rear substrates 3, first press the disc 6 to overcome the third spring 61 so that the disc 6 is pressed into the circular groove 38, and then control the end of the upper roller 4 to enter between the two substrates 3 along the avoidance groove 37. The length of the upper roller 4 is greater than the distance between the two substrates 3. When the upper roller 4 moves between the disc 6 and the front turntable 31 and controls the end of the upper roller 4 to align with the front groove 32, release the disc 6. The third spring 61 will push the disc 6 to move forward along the circular groove 38. During the forward movement of the disc 6, it will squeeze the upper roller 4 forward, so that The end of the upper roller 4 is inserted into the front groove 32 to realize the connection between the end of the upper roller 4 and the front turntable 31. In this way, when the disc 6 is pressed forward, the upper roller 4 will not be separated from the front turntable 31, making the connection between the upper roller 4 and the front turntable 31 more stable; furthermore, a rear groove 62 corresponding to the end of the upper roller 4 is provided on the front side of the disc 6, so the rear end of the upper roller 4 can also enter the rear groove 62 to realize support for the rear end of the upper roller 4 and improve the compressive strength of the upper roller 4. The third spring 61 is in contact with the disc 6 but not connected, so it does not affect the rotation of the disc 6.

[0053] Example 5: The blade plate 24 is connected to the blade groove 21 in a sliding and sealing manner; a driving groove 27 is provided on the outer side of the blade holder 2; the driving groove 27 is connected to the driving plate 7 in a sliding and sealing manner; the driving plate 7 is connected to the bottom of the driving groove 27 through a fourth spring 71; the outer side surface of the driving plate 7 is fixedly connected to a driving plate 72 with a triangular cross-section; a one-way air inlet hole 73 is provided through the driving plate 72 and the driving plate 7; the driving groove 27 is connected to the blade groove 21 through a one-way air outlet hole 74.

[0054] In this embodiment, a pressure relief hole 28 is provided on the front and rear sides of the knife seat 2; a pressure relief rod 8 is movably sealed and connected to the pressure relief hole 28; an annular groove 81 is provided in the middle of the pressure relief rod 8; the middle of the pressure relief hole 28 is connected to the bottom of the knife groove 21 through a connecting hole 29; a first magnet 82 is embedded in the end of the pressure relief rod 8; a second magnet 83 corresponding to the first magnet 82 is embedded in the inner wall of the pressure relief hole 28; the first magnet 82 and the second magnet 83 are magnetically attracted to each other.

[0055] In this embodiment, there are two driving grooves 27 ; the two driving grooves 27 are arranged near the corresponding ends of the tool holder 2 .

[0056] In the process of rotating the motor 34 to reel in the left double rope 41 and the right double rope 52 at the same time, the left double rope 41 and the right double rope 52 will be gradually tightened, and the left double rope 41 and the right double rope 52 will pull the knife seat 2 close to the pipeline, pressing the pressure relief rod 8 to move axially along the pressure relief hole 28, so that the annular groove 81 in the middle of the pressure relief rod 8 is exposed from the pressure relief hole 28, so that the knife groove 21, the connecting hole 29, and the pressure relief hole 28 are connected to the outside world. As the knife seat 2 approaches the pipeline, the pressure of the cutter 22 will drive the knife plate 24 close to the bottom of the knife groove 21, and the knife plate 24 will squeeze the first spring 25 to overcome the elastic force of the first spring 25. The knife plate 24 will make the gas in the knife groove 21 flow out along the connecting hole 29, the annular groove 81 and the pressure relief hole 28 until the knife seat 2 contacts with the pipe, and the cutter 22 retracts until it is in the cutter groove 21. Then, the pressure relief rod 8 is released, and the first magnet 82 embedded in the end of the pressure relief rod 8 is attracted by the corresponding second magnet 83 to reset, and the annular groove 81 in the middle of the pressure relief rod 8 returns to the pressure relief hole 28, so that the annular groove 81 and the pressure relief hole 28 are closed, so that the cutter groove 21 and the connecting hole 29 are disconnected from the outside world; then the left double rope 41 and the right double rope 52 are switched to one retraction and one release, and the knife seat 2 will drive the cutter 22 to move back and forth around the pipe in a circumferential direction. The knife seat 2 will enter the inner side of the base 1 under the pull. In the process of the knife seat 2 entering the inner side of the base 1, the driving plate 72 on the outer side of the knife seat 2 will be squeezed, and the impurities on the surface of the driving plate 72 will be pushed away by the base 1. The outer gas will enter the driving groove 27 along the one-way air inlet 73 to replenish the gas. When the knife seat 2 enters the inner side of the base 1, the driving plate 7 will press the fourth spring 71, and the gas in the driving groove 27 will enter the knife groove 21 along the one-way air inlet hole 73, so that the gas in the knife groove 21 increases. After the gas increases, it will drive the knife plate 24 away from the bottom of the knife groove 21, and the knife plate 24 will drive the cutting knife 22 to extend out of the knife groove 21. After the knife seat 2 moves out of the inner side of the base 1, the fourth spring 71 will push the driving plate 7 to reset, so that the space in the driving groove 27 increases to form a negative pressure, and the outside gas will enter the driving groove 27 along the one-way air inlet hole 73 to replenish the gas. When the knife seat 2 enters the inner side of the base 1 next time, the driving plate 7 will press the gas in the driving groove 27 into the knife seat again. Groove 21, and so on repeatedly. Every time the knife holder 2 moves around the pipe in a circle, the cutting force and depth of the cutter 22 on the pipe will be increased, so that the process of the cutter 22 cutting the pipe is gradual, thereby improving the pipe cutting effect; further, the driving piece 72 is sheet-shaped, relatively thin, and the fourth spring 71 has a large elastic force. Therefore, when the driving piece 72 encounters soil and other materials as the knife holder 2 moves around the pipe, it can easily cross and break the soil. Therefore, only when the driving piece 72 is squeezed by the base 1 can the fourth spring 71 be compressed. The driving groove 27 is arranged near the end of the knife holder 2, so that the squeezing force of the driving piece 72 by the base 1 is increased, so as to better drive the driving piece 72. Example

[0057] During transportation, the left double rope 41 and the right double rope 52 are wound up at the same time, and the knife holder 2 can be placed inside the base 1 to reduce the volume of the entire pipe cutting machine and protect the cutting knife 22 at the same time.

[0058] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A water pipe cutting machine for water conservancy projects, characterized by: The top of the gear train is equipped with a gear that is adapted to move along the gear train, and the bottom of the gear train is equipped with a gear that is adapted to move along the gear train, so that the gear train can move along the gear train more smoothly than the gear train does. The knife plate is connected in a sliding manner in the knife groove; the knife plate is connected to the bottom of the knife groove through a first spring; the side of the knife plate away from the first spring is fixedly connected to the cutter; and the ends of the knife seat are fixedly connected to the earth-breaking knife.

2. The water pipe cutting machine for water conservancy projects according to claim 1, characterized in that: An operating groove is provided on the left side of the base plate; a tensioning groove is provided on the side of the base close to the pipe; a tensioning plate is slidably connected in the tensioning groove; a bolt is threadedly connected between the operating groove and the inside of the tensioning groove; the bolt is rotatably connected to the tensioning plate; a handle is fixed to the rear side of the base plate at the rear position.

3. The water pipe cutting machine for water conservancy projects according to claim 1, characterized in that: The base is provided with two left limit slots on the left side; the left double rope passes through the corresponding left limit slots; the base is provided with two right limit slots on the right side; the right double rope passes through the corresponding right limit slots.

4. The water pipe cutting machine for water conservancy projects according to claim 3, characterized in that: The front and rear inner walls of the left and right limiting grooves are provided with scraping grooves; a scraping block is slidably connected in the scraping groove; the scraping block is connected to the bottom of the scraping groove through a second spring; and the end of the scraping block away from the bottom of the scraping groove is set into a hemispherical shape.

5. The water pipe cutting machine for water conservancy projects according to claim 1, characterized in that: An avoidance groove is provided on the front side of the rear base plate; a circular groove is provided on the rear side of the avoidance groove; a circular disc is movably connected in the circular groove; the circular disc is pressed against the bottom of the circular groove through a third spring; the circular disc corresponds to the front turntable in the front-to-back direction.

6. The water pipe cutting machine for water conservancy projects according to claim 5, characterized in that: The front side of the disc is provided with a rear groove corresponding to the end of the upper roller.

7. The water pipe cutting machine for water conservancy projects according to claim 1, characterized in that: The blade plate is connected to the blade groove in a sliding seal; a drive groove is provided on the outside of the blade seat; the drive groove is connected to the drive plate in a sliding seal; the drive plate is connected to the bottom of the drive groove through a fourth spring; the outer side surface of the drive plate is fixedly connected to a drive plate with a triangular cross-section; a one-way air inlet hole is provided through the drive plate and the drive plate; the drive groove and the blade groove are connected through a one-way air outlet hole.

8. The water pipe cutting machine for water conservancy projects according to claim 7, characterized in that: Pressure relief holes are provided on the front and rear sides of the knife holder; a pressure relief rod is movably sealed and connected in the pressure relief hole; an annular groove is provided in the middle of the pressure relief rod; the middle of the pressure relief hole is connected to the bottom of the knife groove through a connecting hole; a first magnet is embedded in the end of the pressure relief rod; a second magnet corresponding to the first magnet is embedded in the inner wall of the pressure relief hole; the first magnet and the second magnet are magnetically attracted to each other.

9. The water pipe cutting machine for water conservancy projects according to claim 7, characterized in that: There are two driving grooves; the two driving grooves are arranged near the corresponding ends of the tool holder.

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