A cutting device for ductile iron polyethylene composite pipe production

Abstract

The application discloses a cutting device for nodular cast iron polyethylene composite pipe production, which comprises a rack, a walking track, a cutting vehicle body, a supporting vehicle body and a moving driving mechanism. The rack is provided with a first supporting wheel for supporting a receiving section, a limiting stop wheel and a rotating driving mechanism; the cutting vehicle body and the supporting vehicle body are respectively provided with a second supporting wheel and a third supporting wheel for supporting a plug-in section. The cutting vehicle body is provided with a cutting mechanism. The rack, the cutting vehicle body and the supporting vehicle body are all provided with a pipe body positioning auxiliary mechanism, which comprises a first hinged shaft, a positioning rod, a positioning wheel, a supporting cylinder and a turnover driving assembly. The turnover driving assembly drives the positioning rod to switch between a clamping position and a supporting position: when clamping, the positioning wheel and the supporting wheel jointly clamp the pipe; when supporting, the supporting cylinder lifts the pipe to separate the pipe from the supporting wheel, facilitating axial movement. The application can efficiently and accurately cut the pipe, protect the outer wall of the pipe and the inner lining composite layer, and meet the production requirements of non-standard length pipes.

Description

Technical Field

[0001] This invention relates to the field of pipe cutting technology, and in particular to a cutting device for the production of ductile iron polyethylene composite pipes. Background Technology

[0002] Ductile iron-polyethylene composite pipes are typically manufactured using a roll-lining process. This process involves adding polyethylene powder into a sandblasted ductile iron pipe, then melting and uniformly coating the inner wall of the pipe under heating and rotation. After cooling and solidification, a seamless, corrosion-resistant composite structure is formed. This pipe combines the high strength and toughness of ductile iron with the excellent corrosion resistance of polyethylene, making it widely used in underground pipeline projects such as municipal water supply and drainage, and gas transmission.

[0003] Currently, the standard length of ductile iron polyethylene composite pipes in China is 6 meters. The pipe body consists of a socket section (larger outer diameter, shorter length), a spigot section (smaller outer diameter, longer length), and a transition section connecting the socket and spigot sections. Pipe connection is simple: just insert the socket section of one pipe into the spigot section of another. However, in the production process of ductile iron polyethylene composite pipes, standard lengths of pipe usually need to be cut to meet the specific pipe length requirements of construction units.

[0004] Existing methods for cutting ductile iron polyethylene composite pipes mainly rely on manual operation, which suffers from problems such as low cutting efficiency, uneven cuts, and large deviations in end face perpendicularity. Furthermore, manual cutting easily damages the polyethylene composite layer on the inner wall of the pipe, affecting its service life and sealing performance. Therefore, there is an urgent need for an automated cutting device capable of efficiently and accurately cutting ductile iron polyethylene composite pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a cutting device for the production of ductile iron polyethylene composite pipes, which has the effect of efficiently and accurately cutting ductile iron polyethylene composite pipes.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a cutting device for producing ductile iron polyethylene composite pipes, comprising a frame and a traveling track arranged sequentially in the same direction; a cutting carriage and a supporting carriage, both movably mounted on the traveling track; a cutting mechanism mounted on the cutting carriage for cutting the insertion section of the ductile iron polyethylene composite pipe; two moving drive mechanisms respectively mounted on the cutting carriage and the supporting carriage for driving their respective carriages to move along the traveling track; and a pair of first support rollers symmetrically and rotatably mounted on the machine. The frame is supported by rollers that roll together to support the outer wall of the ductile iron polyethylene composite pipe receiving section; a limiting stop wheel is rotatably mounted on the frame, and its outer contour surface rolls against the end face of the receiving section; a rotary drive mechanism is mounted on the frame and is connected to one of the first support rollers for driving the first support roller to rotate actively; at least one pair of second support rollers are rotatably mounted on the cutting vehicle body; at least one pair of third support rollers are rotatably mounted on the support vehicle body, and each pair of second support rollers and each pair of third support rollers are symmetrically arranged and roll together to support the outer wall of the ductile iron polyethylene composite pipe insertion section.

[0007] Three tube positioning auxiliary mechanisms are respectively installed on the frame, cutting carriage, and support carriage. Each tube positioning auxiliary mechanism includes: two first hinge shafts rotatably mounted on the corresponding frame, cutting carriage, or support carriage, with their axes extending axially along the ductile iron polyethylene composite tube; two positioning rods symmetrically located on the left and right sides of the ductile iron polyethylene composite tube, each with a first hinge shaft fixedly connected to its middle portion; the upper and lower ends of the positioning rods are located above and below the ductile iron polyethylene composite tube, respectively; and two positioning wheels rotatably mounted on the two positioning rods. The upper end of the ductile iron polyethylene composite pipe has its axis extending axially along the ductile iron polyethylene composite pipe; two support cylinders are rotatably disposed at the lower ends of the two positioning rods, and their axes extend radially along the ductile iron polyethylene composite pipe; a flipping drive assembly drives the two positioning rods to flip around their corresponding first hinge axes, and flip them to the clamping position or the supporting position. When the positioning rods are in the clamping position, the two positioning wheels and the corresponding support wheels clamp the ductile iron polyethylene composite pipe together; when the positioning rods are in the supporting position, the two support cylinders jointly roll to support the ductile iron polyethylene composite pipe and separate it from the corresponding support wheels.

[0008] A further configuration of the present invention includes: a second hinge shaft, horizontally and rotatably mounted on the cutting vehicle body, with its axis extending along the axial direction of the ductile iron polyethylene composite pipe; a support frame, one end of which is fixedly connected to the second hinge shaft; a three-phase asynchronous motor, fixedly mounted on the other end of the support frame; a cutting blade, fixedly mounted on the rotating shaft of the three-phase asynchronous motor, with its rotation center line parallel to the axis of the second support roller; and a lifting cylinder, the bottom of which is hinged to the cutting vehicle body, and the top of which is hinged to the middle of the support frame.

[0009] A further configuration of the present invention is as follows: the mobile drive mechanism includes: a first worm gear reducer motor, fixedly mounted on a support vehicle body or a cutting vehicle body; a first gear, fixed on the output shaft of the first worm gear reducer motor; and a rack extending along its length direction is fixed on the traveling track, wherein the first gear meshes with the rack.

[0010] A further configuration of the present invention is as follows: the rotary drive mechanism includes a second worm gear reducer motor, which is fixedly mounted on the frame; a first sprocket and a second sprocket, which are respectively fixedly connected to the shaft of the first support roller and the output shaft of the second worm gear reducer motor; and a chain, which is sleeved and mounted on the first sprocket and the second sprocket.

[0011] A further configuration of the present invention is as follows: the flipping drive assembly includes: two sliding frames slidably disposed on the corresponding frame, cutting vehicle, or support vehicle, with their sliding direction perpendicular to the moving direction of the cutting vehicle or support vehicle; two guide slots respectively formed on the two sliding frames; and two sliding rods respectively fixed to two positioning rods and slidably engaged with the two guide slots, wherein each guide slot includes a vertical section. When the two sliding frames slide closer to or further away from each other, the two sliding rods slide upward or downward along the vertical section of the guide slot, respectively. Do not cause the two positioning rods to rotate synchronously to the support position or clamping position; two lead screws are rotatably mounted on the corresponding frame, cutting carriage or support carriage, the helical directions of the two lead screws are opposite, and their axes extend along the sliding direction of the two sliding frames; a third worm gear reducer motor is fixedly mounted on the corresponding frame, cutting carriage or support carriage; a second gear is fixedly mounted on the output shaft of the third worm gear reducer motor; two third gears are respectively fixedly connected to the ends of the two lead screws, and are located on both sides of the second gear and mesh with it.

[0012] A further feature of the present invention is that the guide slot also includes a horizontal section, and the top of the horizontal section is connected to the top of the vertical section. When the slide rod slides from the vertical section of the guide slot into its horizontal section, the two positioning rods flip and lock to the support position.

[0013] A further configuration of the present invention is as follows: a gearbox is fixedly installed on the frame, the cutting carriage, and the support carriage; the second gear and the third gear are located inside the gearbox; the output shaft of the third worm gear reducer motor rotatably passes through the gearbox; and the end of the lead screw rotatably passes through the gearbox.

[0014] A further feature of the present invention is that a slider is fixedly connected to the bottom of the sliding frame, and guide rails that slide in cooperation with the slider are fixedly provided on the frame, the cutting vehicle body, and the support vehicle body.

[0015] A further provision of the present invention is that a safety cover for shielding the first sprocket, the second sprocket, and the chain is fixedly installed on the frame.

[0016] The beneficial effects of this invention are:

[0017] By setting up a cutting carriage, a supporting carriage, a moving drive mechanism, and a cutting mechanism, the machine can automatically complete the cutting operation of ductile iron polyethylene composite pipes without the need for manual hand-held cutting tools, significantly improving cutting efficiency and reducing labor intensity. Moreover, both the cutting carriage and the supporting carriage can move independently along the travel track. The distance between the two can be adjusted by the moving drive mechanism, and with the first support roller and limit stop roller on the frame, it can adapt to the cutting and processing of short pipes of different lengths (such as 2m to 5m) to meet the production needs of non-standard length ductile iron polyethylene composite pipes.

[0018] The cutting mechanism uses a three-phase asynchronous motor to drive the cutting blade to rotate at high speed, and controls the feed and retraction of the blade through a lifting cylinder. Combined with the positioning wheel and support roller to stably clamp the pipe body, it ensures the relative positional accuracy between the cutting blade and the ductile iron polyethylene composite pipe, thereby achieving a cutting effect with a flat cut and high end face perpendicularity.

[0019] The tube positioning auxiliary mechanism uses a flip drive assembly to drive the positioning rod to flexibly switch between the clamping position and the support position. Combined with the synergistic action of the positioning wheel, support cylinder, and support roller, it achieves the dual functions of "precise clamping and cutting" and "convenient adjustment and movement," as detailed below:

[0020] When the positioning rod flips to the clamping position, the two positioning wheels roll from both sides of the ductile iron polyethylene composite pipe to contact the outer wall, and together with the corresponding first support roller, second support roller or third support roller, form a stable and reliable clamping and positioning, so that the ductile iron polyethylene composite pipe is firmly fixed during the cutting process, avoiding cutting deviation due to shaking or offset, and ensuring that the cutting blade can rotate stably to cut the pipe wall, thereby obtaining a flat cut and good end face perpendicularity, and achieving precise cutting;

[0021] When the positioning rod flips to the support position, the two support cylinders jointly roll to support the lower half of the outer wall of the ductile iron polyethylene composite pipe, lifting the pipe and separating it from the support rollers. At this time, the ductile iron polyethylene composite pipe can move freely along its axis, allowing operators to easily and accurately adjust its position to ensure that the end face of the pipe is in close contact with the limiting rollers and that the cutting blade is accurately aligned with the predetermined cutting area. This achieves precise and efficient positioning while simplifying the loading and position adjustment process. Simultaneously, during the lifting of the pipe from the support position, the outer wall of the pipe completely separates from the outer contour of the support rollers, preventing sliding friction between the pipe and the rollers during axial movement. Furthermore, the support cylinders themselves can rotate freely, converting sliding friction into rolling friction, significantly reducing wear on the outer wall of the pipe during cutting. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an overall structural diagram of the positioning rod of the present invention in the clamping position;

[0024] Figure 2 This is an overall structural diagram of the positioning rod of the present invention in the support position;

[0025] Figure 3 This is a diagram showing the relationship between the travel track and the supporting vehicle body of the present invention, as well as a structural schematic diagram of the tube positioning auxiliary mechanism and the moving drive mechanism;

[0026] Figure 4 This is a diagram showing the relationship between the travel track and the cutting vehicle body of the present invention, as well as a structural schematic diagram of the tube positioning auxiliary mechanism and the moving drive mechanism;

[0027] Figure 5 This is a schematic diagram of the cutting mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram showing the positional relationship between the first support roller and the limiting stop roller, and a structural schematic diagram of the flipping drive assembly of the present invention;

[0029] Figure 7 This is a schematic diagram of the rotary drive mechanism of the present invention;

[0030] In the diagram, 1. Frame; 11. First support roller; 12. Limiting roller; 13. Safety cover; 2. Traveling track; 21. Rack; 3. Cutting car body; 31. Second support roller; 4. Support car body; 41. Third support roller; 5. Cutting mechanism; 51. Second hinge shaft; 52. Support frame; 53. Three-phase asynchronous motor; 54. Cutting blade; 55. Lifting cylinder; 6. Moving drive mechanism; 61. First worm gear reducer motor; 62. First gear; 7. Rotary drive mechanism; 71. Second worm gear reducer motor; 72. The... 73. First sprocket; 74. Second sprocket; 8. Chain; 9. Tube positioning auxiliary mechanism; 10. First hinge shaft; 11. Positioning rod; 12. Positioning wheel; 13. Support cylinder; 14. Tilting drive assembly; 15. Sliding frame; 16. Sliding block; 17. Guide rail; 18. Guide slot; 19. Vertical section; 10. Horizontal section; 11. Sliding rod; 12. Lead screw; 13. Nut; 14. Third worm gear reducer motor; 15. Second gear; 16. Third gear; 17. Gearbox. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] See Figures 1 to 4This application provides a cutting device for producing ductile iron polyethylene composite pipes, comprising a frame 1 and a traveling track 2 arranged sequentially along the same horizontal direction; a cutting carriage 3 and a supporting carriage 4 are movably arranged on the traveling track 2; a cutting mechanism 5 is installed on the cutting carriage 3 for cutting the insertion section of the ductile iron polyethylene composite pipe; the cutting carriage 3 and the supporting carriage 4 are respectively equipped with a moving drive mechanism 6 for driving their respective carriages to move independently along the traveling track 2; a pair of first support rollers 11 are symmetrically and rotatably arranged on the frame 1, and the two first support rollers 11 jointly roll and support the outer wall of the receiving section (larger outer diameter and shorter length) of the ductile iron polyethylene composite pipe; the frame 1... A limiting wheel 12 is also rotatably provided. The outer contour surface of the limiting wheel 12 is used to roll against the end face of the receiving section, which plays an axial limiting role. A rotary drive mechanism 7 is also provided on the frame 1. The rotary drive mechanism 7 is connected to one of the first support rollers 11 and is used to drive the first support roller 11 to rotate actively. Two pairs of second support rollers 31 are rotatably provided on the cutting car body 3, and the cutting mechanism 5 is located in the middle gap between the two pairs of second support rollers 31. A pair of third support rollers 41 are rotatably provided on the support car body 4. Each pair of second support rollers 31 and each pair of third support rollers 41 are symmetrically arranged and jointly roll to support the outer wall of the insertion section (smaller outer diameter and longer length) of the ductile iron polyethylene composite pipe.

[0033] See Figures 1 to 4 In this embodiment, each of the frame 1, cutting carriage 3, and support carriage 4 is equipped with a set of tube positioning auxiliary mechanisms 8. Each set of tube positioning auxiliary mechanisms 8 includes two first hinge shafts 81, two positioning rods 82, two positioning wheels 83, two support cylinders 84, and a flipping drive assembly 85. Specifically, the two first hinge shafts 81 are rotatably mounted on the corresponding frame 1, cutting carriage 3, or support carriage 4, and the axes of the two first hinge shafts 81 extend along the axial direction of the ductile iron polyethylene composite pipe. The two positioning rods 82 are symmetrically located on the left and right sides of the pipe, and the middle of each positioning rod 82 is fixedly connected to a first hinge shaft 81. The upper end of the positioning rod 82 is located above the pipe, and the lower end is located below the pipe. The two positioning wheels 83 are rotatably mounted on the upper ends of the two positioning rods 82, and the axes of the positioning wheels 83 extend along the axial direction of the pipe. The two support cylinders 84 are rotatably mounted on the lower ends of the two positioning rods 82, and the axes of the support cylinders 84 extend along the radial direction of the pipe.

[0034] It should be noted that the flipping drive assembly 85 is used to drive the two positioning rods 82 to flip around their respective first hinge axes 81, allowing the positioning rods 82 to switch between a clamping position and a supporting position. When the positioning rods 82 are flipped to the clamping position, the two positioning wheels 83 roll and contact the outer wall of the pipe, and together with the corresponding support rollers (first support roller 11, second support roller 31, or third support roller 41), clamp the positioning pipe. When the positioning rods 82 are flipped to the supporting position, the two support cylinders 84 together roll and support the lower half of the outer wall of the pipe, lifting the pipe and separating it from the corresponding support rollers.

[0035] See Figure 4 , Figure 5 The cutting mechanism 5 in this embodiment includes a second hinge shaft 51, a support frame 52, a three-phase asynchronous motor 53, a cutting blade 54, and a lifting cylinder 55. Specifically, the second hinge shaft 51 is horizontally and rotatably mounted on the cutting vehicle body 3, with its axis extending along the axial direction of the pipe; one end of the support frame 52 is fixedly connected to the second hinge shaft 51; the three-phase asynchronous motor 53 is fixedly mounted on the other end of the support frame 52; the cutting blade 54 is fixedly mounted on the rotating shaft of the three-phase asynchronous motor 53, and the rotation center line of the cutting blade 54 is parallel to the axis of the second support roller 31; the bottom of the cylinder body of the lifting cylinder 55 is hinged to the cutting vehicle body 3, and the top of the piston rod of the lifting cylinder 55 is hinged to the middle of the support frame 52.

[0036] See Figure 3 , Figure 4 In this embodiment, the mobile drive mechanism 6 includes a first worm gear reducer motor 61 and a first gear 62. Specifically, the first worm gear reducer motor 61 is fixedly mounted on the corresponding vehicle body, and the first gear 62 is fixed on the output shaft of the first worm gear reducer motor 61; a rack 21 extending along its length direction is fixed on the travel track 2, and the first gear 62 meshes with the rack 21.

[0037] See Figure 6 , Figure 7 In this embodiment, the rotary drive mechanism 7 includes a second worm gear reducer motor 71, a first sprocket 72, a second sprocket 73, and a chain 74. Specifically, the second worm gear reducer motor 71 is fixedly mounted on the frame 1; the first sprocket 72 is fixedly connected to the shaft of one of the first support rollers 11; the second sprocket 73 is fixedly connected to the output shaft of the second worm gear reducer motor 71; and the chain 74 is sleeved on the first sprocket 72 and the second sprocket 73.

[0038] See Figure 6In this embodiment, the flipping drive assembly 85 includes two sliding frames 851, two guide slots 852, two sliding rods 853, two lead screws 854, a third worm gear reducer motor 856, a second gear 857, and two third gears 858. Specifically, the two sliding frames 851 are slidably mounted on the corresponding frame 1, cutting carriage 3, or support carriage 4, and the sliding direction of the sliding frames 851 is perpendicular to the moving direction of the cutting carriage 3 or support carriage 4; the two guide slots 852 are respectively opened on the two sliding frames 851, each guide slot 852 includes a vertical section 852a, and the top end of the vertical section 852a is connected to a horizontal section 852b; the two sliding rods 853 are respectively fixed on the two positioning rods 82 and are slidably engaged with the two guide slots 852; the two lead screws 854 are rotatably mounted on the corresponding... On the frame 1, cutting carriage 3 or support carriage 4, the two lead screws 854 have opposite helical directions and their axes extend along the sliding direction of the sliding frame 851; the third worm gear reducer motor 856 is fixedly installed on the corresponding frame 1, cutting carriage 3 or support carriage 4; the second gear 857 is fixedly installed on the output shaft of the third worm gear reducer motor 856; the two third gears 858 are respectively fixedly connected to the ends of the two lead screws 854, and the two third gears 858 are respectively located on both sides of the second gear 857, and mesh with the second gear 857.

[0039] When the third worm gear reducer motor 856 drives the second gear 857 to rotate, the two third gears 858 drive the two lead screws 854 to rotate synchronously and in the same direction. Since the helical directions of the lead screws 854 are opposite, the two sliding frames 851 will move closer or further apart. As the sliding frames 851 move, the sliding rod 853 will slide up or down along the vertical section 852a of the guide slot 852, thereby causing the positioning rod 82 to flip. Specifically, when the sliding rod 853 slides from the vertical section 852a into the horizontal section 852b, the positioning rod 82 flips and locks in the support position; when the sliding rod 853 slides from the horizontal section 852b back to the vertical section 852a and slides downward, the positioning rod 82 flips to the clamping position.

[0040] In addition, see Figures 1 to 7In this embodiment, gearboxes 859 are fixedly installed on the frame 1, cutting carriage 3, and support carriage 4. The second gear 857 and the third gear 858 are located inside the gearbox 859. The output shaft of the third worm gear reducer motor 856 rotatably passes through the gearbox 859, and the end of the lead screw 854 rotatably passes through the gearbox 859. A safety cover 13 for shielding the first sprocket 72, the second sprocket 73, and the chain 74 is also fixedly installed on the frame 1. The gearbox 859 and the mounting cover can prevent the transmission components from being exposed and causing injury, thus improving the safety of equipment operation. A slider 851a is fixedly connected to the bottom of the sliding frame 851. The corresponding guide rails 851b that slide with the slider 851a are fixedly installed on the frame 1, cutting carriage 3, and support carriage 4, thereby ensuring the sliding stability of the two sliding frames 851.

[0041] The working steps of this embodiment are as follows:

[0042] First, the ductile iron polyethylene composite pipe to be cut is hoisted above the frame 1, the cutting vehicle 3, and the support vehicle 4, so that the insertion section of the pipe is temporarily placed on the second support roller 31 on the cutting vehicle 3 and the third support roller 41 on the support vehicle 4. At this time, the outer wall of the pipe is in contact with the second support roller 31 and the third support roller 41, but has not yet been axially positioned.

[0043] Next, the tilting drive assembly 85 on the frame 1 and each car body is activated, driving the positioning rod 82 to tilt from the initial position (usually an intermediate state between the clamping position and the support position) to the support position. Specifically, the third worm gear reducer motor 856 drives the lead screw 854 to rotate through gear transmission, causing the two sliding frames 851 to move away from each other. The sliding rod 853 slides upward along the vertical section 852a of the guide slot 852 and enters the horizontal section 852b. The positioning rod 82 tilts upward, causing the two support cylinders 84 to lift the pipe from below, and the outer wall of the pipe separates from the second support roller 31 and the third support roller 41.

[0044] Subsequently, the operator or auxiliary push rod device pushes the pipe axially, so that the receiving section of the pipe moves above the first support roller 11. The end face of the receiving section is in close contact with the limiting stop roller 12 on the frame 1 to achieve axial positioning. At the same time, according to the required cutting length, the position of the cutting car body 3 and the support car body 4 on the travel track 2 is adjusted by the moving drive mechanism 6, so that the cutting blade 54 of the cutting mechanism 5 is aligned with the predetermined cutting line on the pipe insertion section.

[0045] After the above position adjustment is completed, the flip drive assembly 85 is restarted, driving the positioning rod 82 to switch from the support position to the clamping position. Specifically, the third worm gear reducer motor 856 rotates in the opposite direction, causing the sliding frame 851 to move closer to each other. The sliding rod 853 slides from the horizontal section 852b of the guide slot hole 852 into the vertical section 852a and slides downward. The positioning rod 82 flips downward, and the two positioning wheels 83 roll from both sides of the pipe to contact the outer wall and press the pipe downward, so that the outer wall of the pipe re-contacts the first support roller 11, the second support roller 31, and the third support roller 41. At this time, the positioning wheel 83 and each support roller together form a stable clamping position, and the pipe is firmly fixed.

[0046] After the pipe is clamped and stabilized, the rotary drive mechanism 7 on the frame 1 is started. Specifically, the second worm gear reducer motor 71 drives one of the first support rollers 11 to rotate actively through the chain drive of the first sprocket 72, the second sprocket 73 and the chain 74. The first support roller 11 drives the receiving section of the pipe to rotate through friction. Since the pipe is clamped by the positioning wheel 83 and the support roller, the pipe rotates at a constant speed around its own axis.

[0047] After the pipe has rotated smoothly, the cutting mechanism 5 on the cutting vehicle 3 is activated. Specifically, the three-phase asynchronous motor 53 drives the cutting blade 54 to rotate at high speed. At the same time, the piston rod of the lifting cylinder 55 extends, pushing the support frame 52 to rotate downward around the second hinge axis 51. This causes the high-speed rotating cutting blade 54 to gradually approach and contact the outer wall of the pipe insertion section, and, under the rotation of the pipe, to perform a circular cut along the circumference of the pipe. Throughout the cutting process, because the pipe is stably clamped and the rotation center line of the cutting blade 54 is parallel to the pipe axis, the cut is smooth, the end face is perpendicular, and the polyethylene composite layer on the inner wall of the pipe is not subjected to any contact or impact, thus avoiding damage.

[0048] After the cutting blade 54 completely cuts through the pipe wall, the piston rod of the lifting cylinder 55 retracts, causing the support frame 52 to flip upward, so that the cutting blade 54 moves away from the pipe, and the rotation drive mechanism 7 stops working, and the pipe stops rotating. At this time, the pipe is divided into two parts: one part is the receiving section (including part of the original insertion section) that is retained on the frame 1, and the other part is the cut short pipe (located on the cutting vehicle 3 and the support vehicle 4).

[0049] Finally, the tilting drive assembly 85 on each vehicle is activated again, causing the positioning rod 82 to switch from the clamping position to the supporting position. The support cylinder 84 lifts the pipe, separating the two parts of the pipe from the corresponding first support roller 11, second support roller 31, and third support roller 41, respectively. At this time, the support vehicle 4, along with the short pipe on it, is moved away along the travel track 2 by the moving drive mechanism 6, or the cutting vehicle 3 is moved away, so that the two cut parts can be hoisted or rolled away for unloading. After all actions are completed, each vehicle is moved back to its initial position, and the tilting drive assembly 85 resets the positioning rod 82 to the clamping position or standby state, waiting for the next loading.

[0050] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A cutting device for producing ductile iron-polyethylene composite pipes, characterized in that, A frame (1) and a traveling track (2) are arranged sequentially in the same direction; a cutting vehicle (3) and a supporting vehicle (4) are both movably mounted on the traveling track (2); a cutting mechanism (5) is mounted on the cutting vehicle (3) for cutting the splice section of the ductile iron polyethylene composite pipe; two moving drive mechanisms (6) are respectively mounted on the cutting vehicle (3) and the supporting vehicle (4) for driving their respective vehicles to move along the traveling track (2); a pair of first support rollers (11) are symmetrically and rotatably mounted on the frame (1) and jointly roll to support the splice section of the ductile iron polyethylene composite pipe. Outer wall; limiting stop wheel (12), rotatably mounted on the frame (1), and its outer contour surface rolls against the end face of the receiving section; rotation drive mechanism (7), mounted on the frame (1), and connected to a first support wheel (11) for driving the first support wheel (11) to rotate actively; at least one pair of second support wheels (31), rotatably mounted on the cutting vehicle body (3); at least one pair of third support wheels (41), rotatably mounted on the support vehicle body (4), each pair of second support wheels (31) and each pair of third support wheels (41) are symmetrically arranged, and together roll to support the outer wall of the ductile iron polyethylene composite pipe insertion section; Three tube positioning auxiliary mechanisms (8) are respectively installed on the frame (1), the cutting carriage (3), and the support carriage (4). Each tube positioning auxiliary mechanism (8) includes: two first hinge shafts (81), which are rotatably installed on the corresponding frame (1), cutting carriage (3), or support carriage (4), and their axes extend along the axial direction of the ductile iron polyethylene composite tube; two positioning rods (82), which are symmetrically located on the left and right sides of the ductile iron polyethylene composite tube, and each of them is fixedly connected to a first hinge shaft (81) in its middle part. The upper and lower ends of the positioning rods (82) are located above and below the ductile iron polyethylene composite tube, respectively; and two positioning wheels (83), which are rotatably installed on the two positioning rods. The upper end of the rod (82) and its axis extends along the axial direction of the ductile iron polyethylene composite pipe; two support cylinders (84) are respectively rotatably disposed at the lower ends of the two positioning rods (82) and their axes extend along the radial direction of the ductile iron polyethylene composite pipe; the flipping drive assembly (85) drives the two positioning rods (82) to flip around the corresponding first hinge axis (81) and flip to the clamping position or the support position. When the positioning rod (82) is in the clamping position, the two positioning wheels (83) and the corresponding support wheels clamp the positioning ductile iron polyethylene composite pipe together; when the positioning rod (82) is in the support position, the two support cylinders (84) jointly roll to support the ductile iron polyethylene composite pipe and separate it from the corresponding support wheels.

2. The cutting device for producing ductile iron polyethylene composite pipes according to claim 1, characterized in that: The cutting mechanism (5) includes a second hinge shaft (51), which is horizontally and rotatably mounted on the cutting vehicle body (3), and its axis extends along the axial direction of the ductile iron polyethylene composite pipe; a support frame (52), one end of which is fixedly connected to the second hinge shaft (51); a three-phase asynchronous motor (53), which is fixedly mounted on the other end of the support frame (52); a cutting blade (54), which is fixedly mounted on the rotating shaft of the three-phase asynchronous motor (53), and its rotation center line is parallel to the axis of the second support roller (31); and a lifting cylinder (55), the bottom of which is hinged to the cutting vehicle body (3), and the top of which is hinged to the middle of the support frame (52).

3. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 1, characterized in that: The mobile drive mechanism (6) includes: a first worm gear reducer motor (61), which is fixedly installed on the support vehicle body (4) or the cutting vehicle body (3); a first gear (62), which is fixed on the output shaft of the first worm gear reducer motor (61); and a rack (21) extending along its length direction is fixed on the travel track (2), and the first gear (62) meshes with the rack (21).

4. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 1, characterized in that: The rotary drive mechanism (7) includes a second worm gear reducer motor (71), which is fixedly installed on the frame (1); a first sprocket (72) and a second sprocket (73), which are respectively fixedly connected to the shaft of the first support roller (11) and the output shaft of the second worm gear reducer motor (71); and a chain (74), which is sleeved on the first sprocket (72) and the second sprocket (73).

5. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 1, characterized in that: The flipping drive assembly (85) includes: two sliding frames (851), slidably mounted on the corresponding frame (1), cutting vehicle (3), or support vehicle (4), with their sliding direction perpendicular to the moving direction of the cutting vehicle (3) or support vehicle (4); two guide slots (852), respectively opened on the two sliding frames (851); and two sliding rods (853), respectively fixed on two positioning rods (82), and respectively slidingly engaged with the two guide slots (852). The guide slots (852) include a vertical section (852a). When the two sliding frames (851) slide closer to or further away from each other, the two sliding rods (853) slide upward or downward along the vertical section (852a) of the guide slots (852), and The two positioning rods (82) are driven to rotate synchronously to the support position or the clamping position; the two lead screws (854) are rotatably set on the corresponding frame (1), cutting car body (3) or support car body (4), the helical directions of the two lead screws (854) are opposite, and their axes extend along the sliding direction of the two sliding frames (851); the third worm gear reducer motor (856) is fixedly installed on the corresponding frame (1), cutting car body (3) or support car body (4); the second gear (857) is fixedly installed on the output shaft of the third worm gear reducer motor (856); the two third gears (858) are respectively fixedly connected to the ends of the two lead screws (854), and are respectively located on both sides of the second gear (857) and mesh with it.

6. The cutting device for producing ductile iron polyethylene composite pipes according to claim 5, characterized in that: The guide slot (852) also includes a horizontal section (852b), and the top of the horizontal section (852b) is connected to the top of the vertical section (852a). When the slide rod (853) slides from the vertical section (852a) of the guide slot (852) into its horizontal section (852b), the two positioning rods (82) flip and lock to the support position.

7. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 5, characterized in that: Gearboxes (859) are fixedly installed on the frame (1), the cutting car body (3) and the support car body (4). The second gear (857) and the third gear (858) are located inside the gearboxes (859). The output shaft of the third worm gear reducer motor (856) is rotatably inserted through the gearboxes (859). The end of the lead screw (854) is rotatably inserted through the gearboxes (859).

8. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 5, characterized in that: The bottom of the sliding frame (851) is fixedly connected to a slider (851a), and the frame (1), the cutting car body (3) and the support car body (4) are all fixedly provided with guide rails (851b) that slide in cooperation with the slider (851a).

9. The cutting device for producing ductile iron-polyethylene composite pipes according to claim 4, characterized in that: A safety cover (13) for shielding the first sprocket (72), the second sprocket (73) and the chain (74) is fixedly installed on the frame (1).

Images