A synchronous cutting device for both ends of centrifugal cast pipe

Abstract

The application discloses a centrifugal pipe two-end synchronous cutting device, and relates to the technical field of centrifugal pipe processing equipment, which comprises a rack, double-speed lifting cutting mechanisms and a lifting driving mechanism. The double-speed lifting cutting mechanisms are arranged in two sets. Each set of double-speed lifting cutting mechanism comprises a worm gear lifting machine, a double-speed lifting cylinder, a cutting assembly, an elastic buffer device, a one-way pushing assembly and an axial elastic member. The lifting driving mechanism comprises a first rotary driving element, a transmission shaft, a synchronous transmission assembly, a winding wheel and a pull rope. The two worm gear lifting machines are synchronously driven by the same transmission shaft, the speed error and height error caused by multiple execution elements are reduced, the risk of asynchronous contact of the two end cutter heads is significantly reduced, the number of power elements is reduced, the maintenance cost is reduced and the reliability is improved. The combination of the fast descent of the pull rope and the slow advance of the one-way pushing assembly realizes fast approach and stable cutting, reduces the time consumption of the blade movement and improves the cutting efficiency.

Description

Technical Field

[0001] This invention relates to the field of centrifugal casting pipe processing equipment, and in particular to a synchronous cutting device for simultaneously cutting both ends of a centrifugal casting pipe, while taking into account both rapid approach and buffered stable cutting. Background Technology

[0002] Centrifugal ductile iron pipes are cast iron pipes formed by centrifugal casting and are widely used in pipeline projects for water supply, drainage, and gas transmission. After centrifugal casting, the uneven ends of the centrifugally cast pipes need to be cut to achieve the required length.

[0003] For centrifugal cast pipes exceeding 6 meters in length, simultaneous cutting from both ends is typically required to improve cutting efficiency. Current technologies often employ independent drive mechanisms at each end of the centrifugal cast pipe. To meet the process cycle of "feeding and avoidance—rapid approach—slow precision cutting," some solutions configure two power elements at each cutter head. One power element moves rapidly to bring the cutter head close to the cast pipe, while the other moves slowly to gradually cut the pipe, thus achieving cutter head movement. Since a total of four power elements are required at both ends, this not only results in a complex structure and high cost, but also introduces asynchronous cutter head heights due to response and speed errors between multiple actuators. This leads to asynchronous contact between the two cutter heads and the ends of the cast pipe, resulting in defects such as one end contacting first and pressing down on the pipe, changes in pipe posture, and unstable cutting quality. This causes a decrease in cut perpendicularity and end-face flatness, and also results in high system maintenance and limited reliability. For example, the patent with announcement number CN110948056B discloses a fully automatic centrifugal casting pipe cutting machine. Its cutting mechanism is symmetrically arranged in two sets. The cutting mechanism includes a cutting arm, a damping cylinder, a feed cylinder, and a one-way rapid cylinder. Its cutting mechanism has the aforementioned problem.

[0004] Therefore, there is an urgent need for a centrifugal casting pipe synchronous cutting device with a simpler structure, consistent lifting height at both ends, and the ability to achieve rapid approach and buffered slow cutting within the same mechanism. Summary of the Invention

[0005] The purpose of this invention is to provide a synchronous cutting device for both ends of a centrifugal cast pipe. It achieves synchronous lifting and lowering of the cutting mechanisms at both ends through a single synchronous drive, and through dual-speed lifting and elastic buffering, it enables the cutting component to quickly approach the end of the cast pipe and then cut in at a low speed and stably, thereby reducing impact, reducing cutter head wear, preventing the cast pipe from being pressed down and tilted, and improving cutting efficiency and cutting quality.

[0006] To achieve the above objectives, the present invention provides a centrifugal casting pipe end synchronous cutting device, comprising: a frame, a dual-speed lifting cutting mechanism, and a lifting drive mechanism.

[0007] The dual-speed lifting and cutting mechanism is configured as two units distributed on the left and right sides of the frame. Each dual-speed lifting and cutting mechanism includes:

[0008] The worm gear jack is fixedly mounted on a frame and has an input shaft and an output shaft.

[0009] The dual-speed lifting cylinder is slidably connected to the frame in the vertical direction;

[0010] The cutting assembly, installed at the lower end of the dual-speed lifting cylinder, is used to cut the end of the centrifugal casting pipe;

[0011] An elastic buffer device is installed at the lower end of the output shaft of the worm gear jack;

[0012] The single-push-down component is installed at the lower end of the elastic buffer device. The single-push-down component and the dual-speed lifting cylinder form a one-way force transmission cooperation, so that when the single-push-down component moves downward relative to the dual-speed lifting cylinder, it can drive the dual-speed lifting cylinder to move downward synchronously, while when the single-push-down component moves upward relative to the dual-speed lifting cylinder, it does not drive the dual-speed lifting cylinder to rise.

[0013] An axial elastic element, with its lower end connected to the frame and its upper end in contact with the dual-speed lifting cylinder, is used to provide elastic restriction and buffering for the descent stroke of the dual-speed lifting cylinder when it descends by gravity.

[0014] In the first stage, the dual-speed lifting cylinder can descend rapidly at a first speed under the action of gravity so that the cutting component can quickly approach the end of the centrifugal casting pipe. After the dual-speed lifting cylinder comes into contact with the axial elastic element, when the gravity of the dual-speed lifting cylinder is insufficient to continue to compress the axial elastic element, the worm gear jack drives the unidirectional downward pushing component to move downward at a second speed less than the first speed. Through unidirectional force transmission, the dual-speed lifting cylinder overcomes the elastic force of the axial elastic element and descends slowly, so that the cutting component can stably cut the end of the centrifugal casting pipe.

[0015] The lifting drive mechanism includes a first rotary drive element, a transmission shaft, a synchronous transmission assembly, a winding reel, and a pull rope;

[0016] The drive shaft is rotatably connected to the frame, and the drive shaft is synchronously connected to the input shaft of the worm gear lift in the two dual-speed lifting and cutting mechanisms through two sets of synchronous transmission components.

[0017] The winding reel is fixedly installed on the drive shaft, and one end of the pull rope is wound around or fixed to the winding reel, while the other end is connected to the dual-speed lifting drum.

[0018] The first rotary drive element is fixedly mounted on the frame and is connected to the drive shaft or the input shaft of one of the worm gear jacks to drive the two dual-speed lifting and cutting mechanisms to lift and lower synchronously, thereby achieving synchronous cutting of both ends of the centrifugal cast pipe.

[0019] Furthermore, the unidirectional downward pushing assembly includes a unidirectional pushing block, a radial elastic element, and a locking block; the unidirectional pushing block is fixedly installed at the lower end of the output shaft of the worm gear jack; a sliding groove is opened in the unidirectional pushing block, and a radial elastic element and a locking block connected to the radial elastic element are arranged in the sliding groove; a locking groove is opened in the dual-speed lifting cylinder to engage unidirectionally with the locking block, the locking groove restricts the locking block from moving downward relative to the dual-speed lifting cylinder, and the radial elastic element provides a pushing force to the locking block toward the outside of the locking groove so that the locking block and the locking groove remain in contact, thereby realizing unidirectional force transmission.

[0020] Furthermore, the slot cross-section is a right-angled trapezoid, and the slot includes a plane at the bottom and an inclined surface at the top. When the card block contacts the plane, the card block moves downward with the unidirectional push block, which can drive the dual-speed lifting cylinder to move downward synchronously. When the card block moves upward with the unidirectional push block and contacts the inclined surface, the radial elastic element is compressed under the guiding action of the inclined surface, causing the card block to retract into the slide groove, so that the unidirectional push block can move upward relative to the dual-speed lifting cylinder without driving the dual-speed lifting cylinder to rise.

[0021] Furthermore, the inner cavity of the dual-speed lifting cylinder is a square cavity; the one-way push block is slidably installed inside the square cavity; the slots are symmetrically arranged on both sides of the inner wall of the square cavity; and the sliding grooves are symmetrically arranged on both sides of the one-way push block.

[0022] Furthermore, a guide wheel is fixedly installed on the input shaft of the worm gear jack, and the pull rope is connected to the dual-speed lifting cylinder after passing around the guide wheel, so as to change the direction of the force on the pull rope and reduce the pull rope wear.

[0023] Furthermore, the cutting assembly includes a cutting housing, a second rotary drive element, a cutting disc, and a cutting shaft; the cutting housing is fixedly connected to the lower end of the dual-speed lifting cylinder; the cutting shaft is rotatably mounted on the cutting housing; the cutting disc is fixedly mounted on the cutting shaft; the second rotary drive element is fixedly mounted on the cutting housing and drives the cutting shaft and the cutting disc to rotate; the lower ends of the cutting discs of the two dual-speed lifting cutting mechanisms are flush to ensure that the cutting heights at both ends are consistent.

[0024] Furthermore, the top of the dual-speed lifting cylinder is provided with a flange, the lower end face of which is used to contact and cooperate with the axial elastic element; a lifting ring and a guide rod are provided on the flange, the lifting ring is fixedly connected to the pull rope, and the guide rod is slidably connected to the frame to guide and limit the lifting and lowering of the dual-speed lifting cylinder.

[0025] Furthermore, a roller support mechanism is provided on the frame. The roller support mechanism is configured into two sets and arranged at intervals along the axial direction of the centrifugal casting pipe. Each set of roller support mechanism includes a third rotary drive element and two rollers. The two rollers are rotatably mounted on the frame and jointly support the centrifugal casting pipe. The third rotary drive element is drivenly connected to one of the rollers to drive the centrifugal casting pipe to rotate around its axis.

[0026] Furthermore, a centering mechanism is provided on the frame, which includes two linear push rods symmetrically arranged on both sides of the frame. The telescopic ends of the linear push rods are provided with push plates, which are used to contact the ends of the centrifugal casting pipe to axially position and center the centrifugal casting pipe.

[0027] Furthermore, the synchronous transmission assembly includes a first sprocket, a second sprocket, and a transmission chain; the first sprocket is fixedly installed on the input shaft of the worm gear jack, the second sprocket is fixedly installed on the transmission shaft, and the first sprocket and the second sprocket are connected by a transmission chain to achieve synchronous input and synchronous lifting of the two worm gear jacks.

[0028] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0029] 1. High synchronization: The worm gear jacks at both ends are synchronously driven by the same drive shaft, which reduces the speed and height errors introduced by multiple actuators, significantly reduces the risk of asynchronous contact between the cutter heads at both ends, reduces the number of power components, reduces maintenance costs and improves reliability;

[0030] 2. Dual-speed cutting: By combining the rapid descent of the pull rope with the slow advancement of the single-push component, it achieves rapid approach and stable cutting, reducing the time spent moving the blade and improving cutting efficiency. Attached Figure Description

[0031] Figure 1 This is a three-dimensional representation of the centrifugal casting pipe synchronous cutting device according to an embodiment of the present invention. Figure 1 ;

[0032] Figure 2 This is a three-dimensional representation of the centrifugal casting pipe synchronous cutting device according to an embodiment of the present invention. Figure 2 (Rack omitted);

[0033] Figure 3 This is a front view of the synchronous cutting device at both ends of the centrifugal casting pipe according to an embodiment of the present invention;

[0034] Figure 4 This is a partial cross-sectional view of the dual-speed lifting cylinder and the single downward pushing assembly according to an embodiment of the present invention;

[0035] In the diagram: 1-Frame; 2-Elastic buffer device; 3-Worm gear jack; 31-Input shaft; 32-Output shaft; 4-Dual-speed lifting cylinder; 41-Flange; 42-Lifting ring; 43-Guide rod; 5-Axial elastic element; 6-Single downward push assembly; 61-Single push block; 62-Radial elastic element; 63-Clamping block; 64-Slide groove; 65-Clamping slot; 7-Cutting assembly; 71-Cutting shell; 72-Second rotary drive element; 73-Cutting... Cutting shaft; 74-Cutter head; 8-Lifting drive mechanism; 81-First rotary drive element; 82-Drive shaft; 83-Synchronous transmission assembly; 831-First sprocket; 832-Second sprocket; 833-Drive chain; 84-Rewinding wheel; 85-Pull rope; 86-Guide wheel; 9-Supporting roller mechanism; 91-Third rotary drive element; 92-Supporting roller; 10-Centering mechanism; 101-Linear push rod; 102-Push plate; 11-Centrifugal casting pipe. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Please see Figures 1 to 4 This application provides a centrifugal casting pipe end-to-end synchronous cutting device, including a frame 1, two left and right dual-speed lifting cutting mechanisms, a lifting drive mechanism 8, and a roller support mechanism 9. The centrifugal casting pipe 11 is placed on the roller support mechanism 9 on the frame 1. The roller support mechanism 9 drives the casting pipe 11 to rotate around its axis, so that the cutter head 74 performs circumferential cutting on the end of the casting pipe 11 at a stable linear speed.

[0038] The two dual-speed lifting cutting mechanisms are symmetrically arranged on the left and right, respectively corresponding to the cutting positions at both ends of the cast pipe 11. The lower ends of the cutter heads 74 of the two mechanisms are flush to ensure that the cutting height at both ends is consistent.

[0039] like Figures 1 to 3 As shown, the roller support mechanism 9 is configured in two sets, each set containing two rollers 92, which together support the cast pipe 11; one of the rollers 92 is driven by a third rotary drive element 91, which is a geared motor, thereby driving the cast pipe 11 to rotate. By arranging the two sets of roller support mechanisms 9 axially spaced apart, stable support can be provided for cast pipes longer than 6 meters.

[0040] A centering mechanism 10 is installed on the frame 1. The centering mechanism 10 includes two symmetrically arranged linear push rods 101. The linear push rods 101 can be electric push rods, pneumatic push rods, or servo screw modules, etc., and their telescopic ends are equipped with push plates 102. After the material is loaded, the push plates 102 contact the end of the cast pipe, and axial positioning and centering are achieved by pushing from both sides, ensuring that the cutting allowance at both ends is consistent and reducing the impact of axial movement of the cast pipe on the cutting position.

[0041] like Figure 2 As shown, each dual-speed lifting and cutting mechanism includes a frame 2, a worm gear lift 3, a dual-speed lifting cylinder 4, an axial elastic element 5, a single downward push assembly 6, an elastic buffer device 2, and a cutting assembly 7.

[0042] The worm gear jack 3 is fixed on the frame 2 and has an input shaft 31 and an output shaft 32. The characteristics of the worm gear structure are: the output end can obtain a large thrust and a high degree of self-locking, which is beneficial to the positional stability during the cutting process, especially to suppress springback during the slow advance stage.

[0043] The dual-speed lifting cylinder 4 is slidably connected to the frame 1 in the vertical direction. Its lower end is connected to the cutting assembly 7 via an elastic buffer device 2, and its top end is provided with a flange 41. The elastic buffer device 2 is a spring shock absorber, which can prevent the cutting assembly 7 from rigidly contacting the centrifugal casting pipe. The lower end of the axial elastic element 5 is connected to the frame 1, and the upper end contacts and engages with the lower end face of the flange 41, thereby providing elastic support and buffering restraint when the dual-speed lifting cylinder 4 falls to the predetermined position. The axial elastic element 5 can be implemented by a spring assembly, a disc spring assembly, or an elastic buffer, etc. When the dual-speed lifting cylinder 4 falls to the predetermined position, the distance between the bottom end of the cutting assembly 7 and the centrifugal casting pipe is about 2 cm.

[0044] like Figure 2 As shown, the lifting drive mechanism 8 includes a first rotary drive element 81, a transmission shaft 82, two sets of synchronous transmission components 83, a winding wheel 84, and a pull rope 85.

[0045] The drive shaft 82 is rotatably connected to the frame 1 via bearings. The drive shaft 82 is synchronously connected to the input shafts 31 of two worm gear jacks 3 via two sets of synchronous transmission components 83. In this embodiment, the synchronous transmission components 83 adopt a chain drive form, including a first sprocket 831, a second sprocket 832, and a transmission chain 833. The first sprocket 831 is fixed to the input shaft 31 of the worm gear jack, and the second sprocket 832 is fixed to the drive shaft 82. The two are driven by the transmission chain 833. Because power is distributed from both ends by the same drive shaft 82, the phase difference and height error between the two ends can be significantly reduced.

[0046] Two take-up reels 84 are provided, each corresponding to a dual-speed lifting cylinder 4. The take-up reels 84 are mounted on the drive shaft 82, so that the pull rope 85 is wound and unwound synchronously when the drive shaft 82 rotates. One end of the pull rope 85 is wound and fixed to the take-up reel 84, and the other end is fixedly connected to the lifting ring 42 of the dual-speed lifting cylinder 4. A guide wheel 86 can be set on the input shaft 31 of the worm gear jack. The pull rope 85 passes around the guide wheel 86 and then connects to the lifting ring 42 to change the direction of force and improve the stability of the rope path.

[0047] The first rotary drive element 81 can be a servo motor or a stepper motor, which is fixed on the frame 2 and connected to the input shaft 31 of one of the worm gear jacks 3 via a coupling. By controlling the direction, speed and rotation angle of the first rotary drive element 81, the coordinated operation of the dual-speed lifting cylinder 4 during the rising and resetting, rapid descent and approach, and slow advance cutting stages can be achieved.

[0048] like Figure 4 As shown, the one-way downward push assembly 6 includes a one-way push block 61, a radial elastic element 62, and a locking block 63. The one-way push block 61 is fixed to the lower end of the output shaft 32 of the worm gear jack and moves up and down with the output shaft 32.

[0049] The unidirectional push block 61 has a sliding groove 64, and a radial elastic element 62 and a locking block 63 are arranged inside the sliding groove 64. The radial elastic element 62 pushes the locking block 63 outward, causing the locking block 63 to tend to extend out of the sliding groove 64. The inner wall of the dual-speed lifting cylinder 4 has a locking groove 65 that engages unidirectionally with the locking block 63.

[0050] The 65mm cross-section of the card slot is a right-angled trapezoid, including the bottom plane and the top slope:

[0051] When the locking block 63 contacts the plane of the slot 65, the downward movement of the locking block 63 will be blocked by the plane and the force will be transmitted, thereby driving the dual-speed lifting cylinder 4 to move downward synchronously, achieving the effect of pushing down and transmitting force.

[0052] When the locking block 63 moves upward with the one-way push block 61 and contacts the inclined surface of the slot 65, the inclined surface generates a guiding force, which forces the locking block 63 to overcome the radial elastic element 62 and retract into the slide groove 64, so that the locking block 63 can move out of the slot 65 along the inclined surface. Thus, the one-way push block 61 can slide upward relative to the dual-speed lifting cylinder 4 without driving the dual-speed lifting cylinder 4 to rise.

[0053] Furthermore, the inner cavity of the dual-speed lifting cylinder 4 can be configured as a square cavity structure, with the one-way push block 61 guiding and sliding within the square cavity, the slot 65 symmetrically arranged on both sides of the square cavity, and the sliding groove 64 symmetrically arranged on both sides of the one-way push block, which can make the force more balanced and reduce off-center loading and jamming.

[0054] like Figure 2As shown, the cutting assembly 7 includes a cutting housing 71, a second rotary drive element 72, a cutting shaft 73, and a cutter head 74. The cutting housing 71 is fixedly connected to the lower end of the dual-speed lifting cylinder 4. The cutting shaft 73 is rotatably mounted on the cutting housing 71 via bearings, and the cutter head 74 is fixed on the cutting shaft 73. The second rotary drive element 72 is a motor, which drives the cutting shaft 73 to rotate via a belt assembly, thereby driving the cutter head 74 to achieve cutting. The lower ends of the cutter heads 74 at both ends are flush, and factory calibration can be achieved through the installation reference and leveling structure, ensuring the consistency of the cutting end face from a structural perspective.

[0055] Work process:

[0056] 1. Loading avoidance: The dual-speed lifting cylinder 4 rises and resets, the cutting component 7 is in a higher position, and the cutter head 74 is away from the loading area, which facilitates the hoisting or rolling of the casting pipe 11 into the support roller mechanism 9.

[0057] 2. Rapid Approach Stage: Control the winding wheel 84 to release the rope, and release the pulling rope 85 to allow the dual-speed lifting cylinder 4 to descend rapidly under gravity, forming the first speed. Since the descent speed of the dual-speed lifting cylinder 4 is greater than the descent speed of the single downward push assembly 6 driven by the worm gear jack 3 during this stage, when the locking block 63 and the locking groove 65 move relative to each other, they will be pressed back into the sliding groove 64 along the inclined surface, so that the single downward push assembly 6 does not slow down the dual-speed lifting cylinder 4, ensuring that the cutter head 74 quickly approaches the casting pipe;

[0058] 3. Buffering and limiting stage: When the dual-speed lifting cylinder 4 descends to the point where the flange 41 contacts the axial elastic element 5, the axial elastic element 5 provides elastic support and absorbs the descent kinetic energy, avoiding a hard impact between the cutter head 74 and the end of the casting pipe. At this time, it is difficult for the dual-speed lifting cylinder 4 to further compress the axial elastic element 5 by continuing to press down under gravity.

[0059] 4. Slow and stable entry stage: The worm gear jack 3 continuously drives the output shaft 32 downward, and the single downward push assembly 6 moves downward at the second speed; the clamping block 63 contacts the clamping groove 65 and transmits force. The single downward push assembly 6, with the large thrust of the worm gear jack 3, pushes the dual-speed lifting cylinder 4 to overcome the elastic force of the axial elastic element 5 and slowly descends, so that the cutter head 74 cuts into the end of the casting pipe in a stable and low-impact manner; since the two mechanisms are driven synchronously by the same transmission shaft 82, the cutter heads 74 at both ends can achieve synchronous contact and synchronous cutting, avoiding the casting pipe from tilting or tilting due to pressure at one end first;

[0060] 5. Cutting completion and return: After cutting is completed, the first rotary drive element 81 is reversed, and the output shaft 32 of the worm gear jack 3 drives the one-way push block 61 to move upward; the locking block 63 retracts under the guide of the inclined plane, realizing the disengagement from the locking slot 65, and the upward process does not forcibly drive the dual-speed lifting cylinder 4; at the same time, the dual-speed lifting cylinder 4 is lifted and reset by the winding wheel 84 to complete the cycle.

[0061] It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of this invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A device for synchronously cutting both ends of a centrifugal cast pipe, characterized in that, include: frame; The dual-speed lifting and cutting mechanism consists of two components: a worm gear jack, a dual-speed lifting cylinder, a single-downward push assembly, an elastic buffer device, and a cutting assembly. The worm gear jack is fixedly mounted on the frame, and the dual-speed lifting cylinder is slidably connected to the frame. The lower end of the dual-speed lifting cylinder is connected to the cutting assembly via the elastic buffer device. The single-downward push assembly is installed at the lower end of the output shaft of the worm gear jack and engages with the dual-speed lifting cylinder in a unidirectional force transmission manner. An axial elastic element is connected to the frame and engages with the dual-speed lifting cylinder to limit its descent. The lifting drive mechanism includes a first rotary drive element, a drive shaft, a synchronous transmission assembly, a take-up reel, and a pull rope. The drive shaft is rotatably connected to the frame and is synchronously connected to the input shafts of two worm gear jacks via two synchronous transmission assemblies. Two take-up reels, each corresponding to a dual-speed lifting cylinder, are mounted on the drive shaft. Pull ropes are wound around the take-up reels, and the free ends of the pull ropes are connected to the dual-speed lifting cylinders. The first rotary drive element is fixedly mounted on the frame and is connected to the drive shaft or the input shaft of one of the worm gear jacks. In the first stage, the dual-speed lifting cylinder can descend at a first speed by gravity under the action of the rope unwinding; after the dual-speed lifting cylinder abuts against the axial elastic element, the single downward pushing component pushes the dual-speed lifting cylinder to continue descending at a second speed less than the first speed. The one-way downward push assembly includes a one-way push block, a radial elastic element, and a locking block. The one-way push block is fixedly installed at the lower end of the output shaft of the worm gear jack. A sliding groove is installed inside the one-way push block, and a radial elastic element and a locking block connected to the radial elastic element are installed inside the sliding groove. A locking groove is opened inside the dual-speed lifting cylinder to engage with the locking block in one direction. The locking groove restricts the locking block from moving downward relative to the dual-speed lifting cylinder. The radial elastic element provides a pushing force to the locking block to move outward from the locking groove so that the locking block abuts against the locking groove, thereby realizing one-way force transmission. The slot has a right-angled trapezoidal cross-section and includes a flat surface at the bottom and an inclined surface at the top. When the card block contacts the flat surface, the card block moves downward with the unidirectional push block, which can drive the dual-speed lifting cylinder to move downward synchronously. When the card block moves upward with the unidirectional push block and contacts the inclined surface, the radial elastic element is compressed under the guiding action of the inclined surface, causing the card block to retract into the slide groove, so that the unidirectional push block can move upward relative to the dual-speed lifting cylinder without driving the dual-speed lifting cylinder to rise.

2. The centrifugal casting pipe synchronous cutting device according to claim 1, characterized in that, The inner cavity of the dual-speed lifting cylinder is a square cavity. The one-way push block is slidably installed in the inner cavity of the dual-speed lifting cylinder. The slots are symmetrically opened on both sides of the inner cavity of the dual-speed lifting cylinder, and the sliding grooves are symmetrically opened on both sides of the one-way push block.

3. The centrifugal casting pipe synchronous cutting device at both ends according to claim 1, characterized in that, A guide wheel is fixedly installed on the input shaft of the worm gear jack, and the pull rope is connected to the dual-speed lifting cylinder after passing around the guide wheel.

4. The centrifugal casting pipe simultaneous cutting device at both ends according to claim 1, characterized in that, The cutting assembly includes a cutting shell, a second rotary drive element, a cutter disc, and a cutting shaft. The cutting shell is fixedly connected to the lower end of the dual-speed lifting cylinder. The cutting shaft is rotatably mounted on the cutting shell. The cutter disc is fixedly mounted on the cutting shaft. The second rotary drive element is fixedly mounted on the cutting shell. The second rotary drive element drives the cutter disc to rotate. The lower ends of the two cutter discs are flush.

5. The centrifugal casting pipe synchronous cutting device at both ends according to claim 1, characterized in that, The top of the dual-speed lifting cylinder is provided with a flange, and the lower end face of the flange is used to contact and cooperate with the axial elastic element. A lifting ring and a guide rod are installed on the flange. The lifting ring is fixedly connected to the pull rope, and the guide rod is slidably connected to the frame to guide the lifting of the dual-speed lifting cylinder.

6. The centrifugal casting pipe synchronous cutting device according to claim 1, characterized in that, The frame is equipped with a roller support mechanism for supporting and driving the centrifugal cast pipe to rotate. The roller support mechanism consists of two rollers, including a third rotary drive element and two rollers. The rollers are rotatably mounted on the frame, and the two rollers jointly support the centrifugal cast pipe. The third rotary drive element is connected to one of the rollers in a transmission connection.

7. The centrifugal casting pipe synchronous cutting device according to claim 1, characterized in that, The frame is equipped with a centering mechanism for axially positioning the centrifugal casting pipe. The centering mechanism includes two linear push rods, which are symmetrically installed on both sides of the frame. The telescopic ends of the linear push rods are equipped with push plates, which are used to contact the ends of the centrifugal casting pipe to axially position the centrifugal casting pipe.

8. The centrifugal casting pipe synchronous cutting device according to claim 1, characterized in that, The synchronous transmission assembly includes a first sprocket, a second sprocket, and a transmission chain. The first sprocket is fixedly mounted on the input shaft of the worm gear jack, and the second sprocket is fixedly mounted on the transmission shaft. The first sprocket and the second sprocket are connected by a transmission chain.

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