Multiphase fluid collaborative cooling and shaping type extruder for corrugated pipe conical twin-screw extrusion

Abstract

The present invention relates to the technical field of bellows production, specifically a multi-phase fluid collaborative cooling and shaping type extruder for conical twin-screw extrusion of bellows, including a support and an extrusion assembly provided on the support; further comprising: a multi-phase cooling mechanism provided on the support; a circulating chain, with a set on each side of the support, and a plurality of internally hollow arc-shaped members are provided on the circulating chain. After the pipe fitting is extruded through the die head of the extrusion assembly, the circulating chain can cause the arc-shaped members on both sides of the pipe fitting to close; a plurality of air extraction mechanisms are provided on the arc-shaped members, which can form a negative pressure state inside the arc-shaped members, and the air extraction mechanism is also connected with a negative pressure detection mechanism; it has significant advantages in terms of cost, precision, environmental adaptability and maintenance difficulty, and can detect the internal and external pressure difference in real time to avoid a series of problems caused by the fact that the external pressure is an uncertain factor.

Description

Technical Field

[0001] The present invention relates to the technical field of bellows production, and specifically to a multi-phase fluid collaborative cooling and shaping type extruder for conical twin-screw extrusion of bellows. Background Art

[0002] A bellows is a pipe with a corrugated structure. It is usually made of materials such as metals (such as stainless steel, copper, etc.) or plastics, and has good flexibility and elasticity. It can expand and contract, and can be used to absorb displacements such as thermal expansion and contraction and mechanical vibration in a pipeline system. Its structure enables it to achieve a large deformation amount in a small space and is convenient for installation. It is widely used in industrial pipelines, wire protection, building drainage and other fields, and can effectively protect the internal medium or cables, playing various roles such as sealing and compensation. It is a practical and common pipe.

[0003] During the production of bellows, usually, a pipe fitting is extruded by an extruder, and then a negative pressure is applied circumferentially to the pipe fitting through a mold to form an annular corrugation. However, in order to ensure the uniformity of the negative pressure distribution in the mold so that the annular corrugation can be formed evenly, in the existing negative pressure suction device, the setting of the air extraction speed often leads to too high local negative pressure due to too fast air extraction speed, thereby affecting the forming effect.

[0004] Since the shape of the bellows is cylindrical when it is extruded by the extruder; when the to-be-extruded cylindrical blank pipe enters each section of the forming mold, the negative pressure is used to make the blank pipe that has not been plastically formed fit the inner wall of the mold to form a corrugated outer shape. At different pipe sections of the blank pipe at different distances from the extruder, the heat loss amounts are different, resulting in different plastic deformation capabilities at each section under the same negative pressure intensity.

[0005] In the early stage of bellows forming, independent annular chambers that are mutually separated are formed between each section of the bellows in each forming mold, and the negative pressure pump conducts an equal amount of negative pressure values into each space. However, due to the unequal plastic deformation amounts of the sections corresponding to each space, the forming deformation amounts of the bellows are not consistent under the same negative pressure environment.

[0006] Especially in the early stage of bellows forming, due to the forced deformation of the pipe fittings in a negative pressure environment, separate spaces isolated from each other are formed between multiple annular chambers in each forming die. Pressure differences will be caused due to differences in the deformation amounts of the pipe fittings (the stress and deformation capabilities of different parts of the pipe fittings change with the cooling time. The initial part extruded by the extruder has more heat loss and lower thermoplasticity. Therefore, when the pipe fittings are subjected to the same initial negative pressure, there will be differences in the deformation amounts). Among them, in the part segments with smaller deformation amounts, due to the small volume change, the negative pressure change is small; while in the part segments with higher thermoplasticity, due to the larger deformation amount, the negative pressure change is large, resulting in a pressure difference between the part segments with high thermoplasticity and those with low thermoplasticity, affecting the efficiency of the entire air extraction process and the forming effect of the final bellows product. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-phase fluid collaborative cooling and shaping type extruder for conical twin-screw extrusion of bellows, so as to solve the problems proposed in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A multi-phase fluid collaborative cooling and shaping type extruder for conical twin-screw extrusion of bellows, including a support and an extrusion assembly provided on the support; further including: a multi-phase cooling mechanism provided on the support; a circulating chain, with a set on each side of the support, and a plurality of arc-shaped members with hollow interiors are provided on the circulating chain. After the pipe fittings are extruded from the die head of the extrusion assembly, the circulating chain can cause the arc-shaped members on both sides of the pipe fittings to close; among them, a plurality of air extraction mechanisms capable of forming a negative pressure state inside the arc-shaped members are provided on the arc-shaped members, and the air extraction mechanism is also connected to a negative pressure detection mechanism. When the negative pressure detection mechanism is triggered, the air extraction rate of the air extraction mechanism can be increased.

[0009] As a further solution of the present invention: A plurality of partition plates are equidistantly arranged inside the arc-shaped member to form a plurality of arc-shaped chambers inside the arc-shaped member. A plurality of grooves are equidistantly arranged on the inner wall of the arc-shaped member, and arc-shaped through grooves communicating with the arc-shaped chambers are provided on the inner wall of the grooves; among them, a plurality of arc-shaped conduits are also provided on the outer wall of the arc-shaped member, and both ends of the arc-shaped conduit are communicated with the arc-shaped chamber and connected to the air extraction mechanism.

[0010] As a further solution of the present invention: The air extraction mechanism includes a vertical plate fixed on the arc-shaped member and a cylinder fixed on the vertical plate. The cylinder is connected to the arc-shaped conduit through a connecting pipe. Among them, a first cylindrical cavity and a second cylindrical cavity are formed inside the cylinder, and the diameter of the second cylindrical cavity is larger than that of the first cylindrical cavity; the air extraction mechanism further includes: a suction assembly provided inside the cylinder and connected to the negative pressure detection mechanism through a conduction control component.

[0011] As a further solution of the present invention: The suction assembly includes a first piston disk and a second piston disk that are respectively sealed and slidably disposed in the first cylindrical cavity and the second cylindrical cavity. A cylinder is further installed on the arc-shaped member, and a connecting plate is fixed to the movable end of the cylinder; wherein, a through hole is provided on the first piston disk, and the conduction control assembly can switch the conduction and blocking states of the through hole. A vertical shaft is rotatably installed on the connecting plate, and the vertical shaft is rotatably connected to the first piston disk and the second piston disk, and the vertical shaft is further connected to the conduction control assembly.

[0012] As a further solution of the present invention: The conduction control assembly includes a blocking piece fixed on the vertical shaft and hermetically and slidably attached to the first piston disk. A transmission sleeve slidably sleeved with the vertical shaft is rotatably installed on the vertical plate. A gear is fixed on the transmission sleeve, and the gear meshes with a toothed plate movably disposed on the cylinder body through an energy storage structure, and the energy storage structure cooperates with the negative pressure detection mechanism.

[0013] As a further solution of the present invention: Two strip-shaped protrusions are formed on the outer wall of the vertical shaft, and two transmission grooves are provided on the inner wall of the transmission sleeve. The transmission grooves are adapted to the strip-shaped protrusions, and both are parallel to the central axis of the vertical shaft.

[0014] As a further solution of the present invention: An internally hollow assembly plate is fixedly provided on the outer wall of the cylinder body. The energy storage structure includes a slider slidably disposed in the assembly plate and fixedly connected to the toothed plate. A guide shaft that penetrates through the slider and is slidably connected to the slider is further fixed in the assembly plate. A first spring is sleeved on the outer periphery of the guide shaft, and both ends of the first spring are respectively connected to the inner wall of the assembly plate and the slider. A convex column is fixed on the slider, and the convex column cooperates with the negative pressure detection mechanism.

[0015] As a further solution of the present invention: The negative pressure detection mechanism includes a cylinder fixed on the cylinder body and communicating with the cylinder body, and a third piston disk that is hermetically and slidably disposed in the cylinder through an elastic support structure. The third piston disk is fixedly connected to a follower plate through a connecting arm. A groove adapted to the convex column is provided on the follower plate, and the convex column extends into the groove and is slidably connected to the follower plate; wherein, two convex ears are fixed on the inner wall of the cylinder, and the elastic support structure includes two follower columns fixed on the third piston disk and respectively slidably connected to the two convex ears. A second spring is sleeved on the follower column, and one end of the second spring is connected to the convex ear, and the other end is connected to a convex platform fixed at the end of the follower column away from the third piston disk.

[0016] As a further solution of the present invention: The tank body includes a connected first tank section, second tank section, third tank section, fourth tank section, and fifth tank section. The first tank section and the second tank section are collinear and parallel to the fourth tank section, and the third tank section is perpendicular to the second tank section. Among them, the fifth tank section is inclined, and the end far from the fourth tank section is communicated with the connection of the first tank section and the second tank section. A limiting member is also hinged on the follower plate. The limiting member is located at the end of the fifth tank section far from the fourth tank section, and a torsion spring is connected to the rotation axis of the limiting member.

[0017] As a further solution of the present invention: The multiphase cooling mechanism includes a gas-phase cooling component and a liquid-phase cooling component provided on the support. The gas-phase cooling component includes a plurality of first rings evenly distributed along the pipe fitting transmission direction, and the liquid-phase cooling component includes a plurality of second rings evenly distributed along the pipe fitting transmission direction. Among them, a plurality of nozzles are provided on both the first ring and the second ring, and the nozzles on the two are respectively used for blowing air and spraying water on the pipe fitting. The blowing temperature of the plurality of first rings and the spraying temperature of the second ring both decrease along the pipe fitting transmission direction.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This application uses a cylinder and a third piston disk to monitor the pressure difference between the inside and the outside of the arc-shaped part in real time. When a certain amount of displacement occurs in the third piston disk, that is, when the initial stage of air extraction should terminate, the energy storage structure can quickly release elastic potential energy, prompting the baffle to switch the blocking state of the through hole to a conducting state. Utilizing the characteristic that the diameter of the second cylindrical cavity is larger than that of the first cylindrical cavity, in the later stage of air extraction, the air extraction rate is automatically increased. During the forming process of the corrugated pipe, the pressure among the chambers formed inside the arc-shaped part is balanced. Even if there are differences in the thermoplastic deformation of different segments, no pressure difference will be generated due to being separated from each other, ultimately resulting in deviations in the external dimensions and telescopic redundancy of the formed corrugated pipe.

[0019] This application innovatively adopts a mechanical interlock method to automatically adjust the air extraction rate, can detect the internal and external pressure difference in real time, and can timely compensate the pressure differences of each part segment when different plastic deformations occur in each part segment, avoiding the generation of an obvious pressure difference between the part segment with a higher thermoplasticity and the part segment with a lower thermoplasticity, causing excessive pressure supply on the formed segment, making it difficult to accurately estimate the duration of the initial stage of air extraction, and thus easily leading to inaccurate termination time of the initial stage of air extraction, affecting the efficiency and effect of the entire air extraction process. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a multiphase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion.

[0021] Figure 2 Schematic diagram of another angle of the structure of an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0022] Figure 3 Top view of an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0023] Figure 4 Schematic diagram of the structure of the arc-shaped part in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0024] Figure 5 Schematic diagram of another angle of the structure of the arc-shaped part in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0025] Figure 6 Front view of the arc-shaped part in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0026] Figure 7 For Figure 6 Stereoscopic sectional view in the B-B direction in;

[0027] Figure 8 Partial sectional view showing the inner side of the arc-shaped part in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0028] Figure 9 Schematic diagram of the internal structure of the cylinder in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0029] Figure 10 Schematic diagram of the structure of the air extraction mechanism in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0030] Figure 11 Schematic diagram of another angle of the structure of the air extraction mechanism in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0031] Figure 12 Exploded view of the structure of the negative pressure detection mechanism in an embodiment of a multi-phase fluid collaborative cooling and shaping extruder for corrugated pipe conical twin-screw extrusion;

[0032] Figure 13 For Figure 12 Schematic diagram of another angle of the structure;

[0033] Figure 14 For Figure 12 Enlarged view of the structure at A in.

[0034] In the figure: 1, support; 2, extrusion assembly; 3, circulating chain; 4, first ring body; 5, second ring body; 6, arc-shaped member; 601, groove; 602, arc-shaped through groove; 603, partition plate; 7, arc-shaped conduit; 8, vertical plate; 9, cylinder; 10, connecting plate; 11, cylinder body; 1101, first cylindrical cavity; 1102, second cylindrical cavity; 12, connecting pipe; 13, vertical shaft; 1301, strip-shaped protrusion; 14, first piston disk; 1401, through hole; 15, second piston disk; 16, retaining piece; 17, transmission sleeve; 1701, transmission groove; 18, gear; 19, toothed plate; 20, assembly plate; 21, guide shaft; 22, slider; 2201, convex column; 23, first spring; 24, cylinder; 2401, lug; 25, third piston disk; 26, follower plate; 2601, first groove section; 2602, second groove section; 2603, third groove section; 2604, fourth groove section; 2605, fifth groove section; 27, limiting member; 28, follower column; 2801, convex platform; 29, second spring; 30, connecting arm. Specific implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0036] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0037] Please refer to Figures 1-14, in the embodiments of the present invention, a multi-phase fluid collaborative cooling and shaping type extruder for corrugated bellows conical twin-screw extrusion includes a support 1 and an extrusion assembly 2 provided on the support 1; further includes: a multi-phase cooling mechanism provided on the support 1; a circulating chain 3, with a set on each side of the support 1, and a plurality of internally hollow arc-shaped members 6 are provided on the circulating chain 3. After the pipe fittings are extruded through the die head of the extrusion assembly 2, the circulating chain 3 can cause the arc-shaped members 6 on both sides of the pipe fittings to close. Among them, a plurality of air extraction mechanisms are provided on the arc-shaped member 6 that can form a negative pressure state inside the arc-shaped member 6, and the air extraction mechanism is also connected to a negative pressure detection mechanism. When the negative pressure detection mechanism is triggered, it can cause the air extraction rate of the air extraction mechanism to increase.

[0038] Furthermore, the extrusion assembly 2 is an application of the prior art. Specifically, conical twin-screw extrusion is adopted, and conical twin-screw extrusion has significant advantages. Its efficient plasticizing and mixing ability ensures uniform mixing of materials and improves product quality. It has strong adaptability and can process a variety of plastic raw materials, especially soft and hard PVC, and powder materials can be directly formed. It is energy-saving and low-consumption, reducing production costs. The precise temperature control and speed regulation system ensure production stability. In addition, it is easy to maintain and has a long service life, making it an ideal choice in the fields of plastic processing and the like.

[0039] In addition, it should be noted that in actual production, the running speed of the circulating chain 3 and the extrusion speed of the pipe fittings need to be coordinated. After the pipe fittings are extruded through the extrusion assembly 2 and reach between the two circulating chains 3, the two arc-shaped members 6 on both sides of the pipe fittings will close and wrap the pipe fittings. Immediately, the air extraction mechanism extracts air from the arc-shaped member 6, causing a negative pressure to form inside the arc-shaped member 6. Then, under the shaping effect of the two arc-shaped members 6 on both sides of the pipe fittings, annular corrugations of the bellows are formed on the pipe fittings. During this process, the negative pressure detection mechanism will continuously detect the negative pressure state inside the arc-shaped member 6. When the negative pressure state reaches a certain level, the negative pressure detection mechanism will cause the air extraction mechanism to increase the air extraction rate, thereby realizing the step-by-step air extraction function. It should be added that the method of step-by-step air extraction is adopted, that is, first extract air at a lower air extraction speed. After the pressure inside the arc-shaped member 6 gradually decreases, then gradually increase the air extraction speed. This can avoid excessive local negative pressure caused by too fast air extraction speed, which in turn affects the uniformity of the formation of annular corrugations on the bellows. The specific principle is as follows: The continuity equation in fluid mechanics: In fluid mechanics, the continuity equation describes the mass conservation of fluid during the flow process. For gases, the continuity equation can be expressed as: .

[0040] where ρ is the gas density, v is the gas velocity, and t is the time. This equation shows that during the flow of gas, the changes in density and velocity must satisfy mass conservation.

[0041] The Bernoulli equation describes the conservation of energy during fluid flow. For an incompressible fluid, the Bernoulli equation can be expressed as: .

[0042] where P is the pressure, ρ is the density, v is the velocity, g is the acceleration due to gravity, and h is the height. This equation indicates that during fluid flow, the sum of pressure, kinetic energy, and potential energy remains constant.

[0043] 1. Initial stage (low pumping speed): When the pumping speed is low, gas is slowly extracted from the cavity, the gas flow is relatively smooth, and the velocity gradient is small.

[0044] Due to the low pumping speed, the flow resistance of the gas in the cavity is small, and the pressure distribution is relatively uniform.

[0045] The low pumping speed helps to avoid excessive local negative pressure because the kinetic energy of the gas flow is low and does not generate excessive pressure gradients in certain areas.

[0046] 2. Intermediate stage (pressure gradually decreasing): As pumping progresses, the pressure in the cavity gradually decreases, and the gas density decreases.

[0047] Due to the pressure reduction, the flow resistance of the gas further decreases, and the gas flow becomes more uniform.

[0048] At this stage, the kinetic energy of the gas flow is still low, and the pressure distribution remains relatively uniform.

[0049] 3. Later stage (gradually increasing the pumping speed): When the pressure in the cavity drops to a certain level, the pumping speed can be gradually increased.

[0050] Since the pressure in the cavity is already low, the flow resistance of the gas further decreases, and even if the pumping speed is increased, the gas flow remains relatively uniform.

[0051] Gradually increasing the pumping speed can avoid excessive local negative pressure caused by too fast pumping speed because the kinetic energy of the gas flow is still low at a lower pressure.

[0052] Generally speaking, stepwise pumping adjusts the pumping speed in stages to ensure the smoothness and uniformity of gas flow, thereby reducing the pressure gradient. This method utilizes the basic principle of gas flow. By controlling the pumping speed and pressure, it avoids excessive local negative pressure and achieves a uniform negative pressure distribution. Stepwise pumping is an effective method that can significantly reduce the pressure gradient, ensure a uniform negative pressure distribution in the cavity, and further effectively improve the uniformity of the formation of annular corrugations on the bellows, guaranteeing the quality of the finished product.

[0053] Please refer to again Figures 5-8, a plurality of partition plates 603 are equidistantly arranged inside the arc-shaped member 6, so as to form a plurality of arc-shaped chambers inside the arc-shaped member 6. A plurality of grooves 601 are equidistantly arranged on the inner wall of the arc-shaped member 6, and arc-shaped through grooves 602 communicating with the arc-shaped chambers are arranged on the inner wall of the grooves 601; wherein, a plurality of arc-shaped conduits 7 are further arranged on the outer wall of the arc-shaped member 6, and both ends of the arc-shaped conduits 7 communicate with the arc-shaped chambers and are connected to the air extraction mechanism.

[0054] Furthermore, both ends of the arc-shaped conduit 7 communicate with the arc-shaped chamber. When the two arc-shaped members 6 located on both sides of the pipe fitting are closed, the corresponding arc-shaped chambers on the two arc-shaped members 6 form an annular chamber, and this annular chamber has four communication points. These four points are evenly and reasonably distributed on the circumference of the annular chamber. Based on such a structural characteristic, when the air extraction operation is started, the gas in the annular chamber can be simultaneously extracted from these four communication points, which means that the multi-point air extraction function of multiple air extraction points working together is realized.

[0055] Refer to again Figure 4 , the air extraction mechanism includes a vertical plate 8 fixed on the arc-shaped member 6 and a cylinder body 11 fixed on the vertical plate 8. The cylinder body 11 is connected to the arc-shaped conduit 7 through a connecting pipe 12; wherein, a first cylindrical chamber 1101 and a second cylindrical chamber 1102 are formed inside the cylinder body 11, and the diameter of the second cylindrical chamber 1102 is larger than that of the first cylindrical chamber 1101; the air extraction mechanism further includes: a suction assembly, arranged inside the cylinder body 11 and connected to the negative pressure detection mechanism through a conduction control assembly.

[0056] Please refer to again Figures 9-11 , the suction assembly includes a first piston disk 14 and a second piston disk 15 which are respectively hermetically and slidably arranged inside the first cylindrical chamber 1101 and the second cylindrical chamber 1102. An air cylinder 9 is further installed on the arc-shaped member 6, and a connecting plate 10 is fixed to the movable end of the air cylinder 9; wherein, a through hole 1401 is arranged on the first piston disk 14, and the conduction control assembly can switch the conduction and blocking states of the through hole 1401. A vertical shaft 13 is rotatably installed on the connecting plate 10, and the vertical shaft 13 is rotationally connected to the first piston disk 14 and the second piston disk 15, and the vertical shaft 13 is also connected to the conduction control assembly.

[0057] When the two arc-shaped members 6 on both sides of the pipe are closed, the movable end of the cylinder 9 begins to extend, pushing the connecting plate 10 to drive the first piston disk 14 and the second piston disk 15 to rise in the first cylindrical cavity 1101 and the second cylindrical cavity 1102 respectively through the vertical shaft 13; in the initial stage of the above-mentioned vacuum process, that is, the through hole 1401 is in a blocked state, since the diameter of the first cylindrical cavity 1101 is small, the vacuum rate at this time is low; for the later stage, the conduction control component has switched the blocking state of the through hole 1401 to the conduction state, so the second piston disk 15 is used to realize vacuum, and since the diameter of the second cylindrical cavity 1102 is large, the vacuum rate is increased when the movement rate of the cylinder 9 remains unchanged.

[0058] Please refer again Figure 11 The conduction control assembly includes a baffle 16 fixed on the vertical shaft 13 and sealingly slidingly fitted with the first piston disc 14. A transmission sleeve 17 slidingly fitted with the vertical shaft 13 is rotatably mounted on the vertical plate 8. A gear 18 is fixed on the transmission sleeve 17. The gear 18 is meshed with a toothed plate 19 movably arranged on the cylinder 11 through an energy storage structure. The energy storage structure cooperates with the negative pressure detection mechanism. Two strip-shaped protrusions 1301 are formed on the outer wall of the vertical shaft 13. Two transmission grooves 1701 are provided on the inner wall of the transmission sleeve 17. The transmission grooves 1701 are adapted to the strip-shaped protrusions 1301, and both are parallel to the central axis of the vertical shaft 13.

[0059] Furthermore, during the process of pumping, the negative pressure detection mechanism detects the progress of pumping (i.e., the negative pressure situation in the arc-shaped member 6) in real time. The negative pressure detection mechanism cooperates with the energy storage structure. When the energy storage structure releases elastic potential energy, that is, the initial stage of surface pumping is over, the energy storage structure will drive the tooth plate 19 to move during the process of releasing the elastic potential energy, so that the tooth plate 19 drives the transmission sleeve 17 to rotate through the gear 18, and then the transmission sleeve 17 drives the vertical shaft 13 to rotate through the transmission groove 1701 and the strip protrusion 1301, and the baffle 16 deflects and is misaligned with the through hole 1401. The through hole 1401 is connected, and the initial stage of pumping is automatically terminated.

[0060] It should be emphasized that in order to ensure that the baffle 16 can be smoothly misaligned with the through hole 1401 when the vertical shaft 13 rotates, a guide groove is provided on the inner wall of the first cylindrical cavity 1101, and the outer wall of the first piston disc 14 is provided with a protrusion (not numbered in the figure) adapted to the guide groove. The setting of the guide groove and the protrusion can limit the first piston disc 14.

[0061] Please refer again Figure 13, an assembly plate 20 with a hollow interior is fixedly provided on the outer wall of the cylinder body 11. The energy storage structure includes a slider 22 slidably disposed in the assembly plate 20 and fixedly connected to the toothed plate 19. A guide shaft 21 that penetrates through the slider 22 and is slidably connected to the slider 22 is also fixedly installed in the assembly plate 20. A first spring 23 is sleeved on the outer periphery of the guide shaft 21. Two ends of the first spring 23 are respectively connected to the inner wall of the assembly plate 20 and the slider 22. A convex post 2201 is fixedly installed on the slider 22, and the convex post 2201 cooperates with the negative pressure detection mechanism.

[0062] Please refer to again Figure 12 , Figure 13 and Figure 14 , the negative pressure detection mechanism includes a cylinder 24 fixedly installed on the cylinder body 11 and communicated with the cylinder body 11, and a third piston disk 25 hermetically slidably disposed in the cylinder 24 through an elastic support structure. The third piston disk 25 is fixedly connected to a follower plate 26 through a connecting arm 30. A groove adapted to the convex post 2201 is provided on the follower plate 26. The convex post 2201 extends into the groove and is slidably connected to the follower plate 26. Wherein, two convex ears 2401 are fixedly installed on the inner wall of the cylinder 24. The elastic support structure includes two follower columns 28 fixedly installed on the third piston disk 25 and respectively slidably connected to the two convex ears 2401. A second spring 29 is sleeved on the follower column 28. One end of the second spring 29 is connected to the convex ear 2401, and the other end is connected to a convex platform 2801 fixed to the end of the follower column 28 away from the third piston disk 25.

[0063] The groove includes a connected first groove section 2601, second groove section 2602, third groove section 2603, fourth groove section 2604, and fifth groove section 2605. The first groove section 2601 and the second groove section 2602 are collinear and parallel to the fourth groove section 2604. The third groove section 2603 is perpendicular to the second groove section 2602. Wherein, the fifth groove section 2605 is inclined. One end thereof away from the fourth groove section 2604 is communicated with the connection part of the first groove section 2601 and the second groove section 2602. A limiting member 27 is also hinged on the follower plate 26. The limiting member 27 is located at one end of the fifth groove section 2605 away from the fourth groove section 2604, and a torsion spring is connected to the rotation shaft of the limiting member 27.

[0064] Furthermore, since the fifth groove section 2605 is inclined, the limiting member 27 can only yaw towards the side of the second groove section 2602 in the fifth groove section 2605, and automatic reset can be achieved by using a torsion spring; before the air extraction starts, the convex column 2201 is located at the end of the first groove section 2601 away from the second groove section 2602; in the initial stage of air extraction, as the pressure in the arc-shaped member 6 decreases, under the action of the pressure difference, the third piston disc 25 will gradually move downward in the cylinder 24. Correspondingly, the second spring 29 is compressed, and the third piston disc 25 drives the follower plate 26 to move downward through the connecting arm 30. At this time, the first groove section 2601 and the second groove section 2602 will successively pass by the convex column 2201. After the third groove section 2603 is flush with the convex column 2201, at this time, that is, the initial stage of surface air extraction ends, the first spring 23 rebounds, and the slider 22 will slide within the assembly plate 20. The convex column 2201 slides along the third groove section 2603 to the end of the fourth groove section 2604 away from the fifth groove section 2605. At the same time, the toothed plate 19 moves together with the slider 22, prompting the gear 18 to drive the transmission sleeve 17 to rotate, so that the vertical shaft 13 drives the baffle 16 to deflect, and the through hole 1401 switches from the blocked state to the conducting state, realizing the automatic termination of the initial stage of air extraction; after the entire air extraction process ends, under the action of negative pressure, annular corrugations are formed in the circumferential direction of the pipe fitting. As the circulating chain 3 operates, the two closed arc-shaped members 6 will separate, and the negative pressure state in the arc-shaped member 6 is released. Furthermore, the second spring 29 rebounds (the elastic potential energy of the second spring 29 is greater than the elastic potential energy of the first spring 23), the third piston disc 25 resets, the follower plate 26 moves upward, and the fourth groove section 2604 and the fifth groove section 2605 will successively pass by the convex column 2201. Since the fifth groove section 2605 is inclined and the limiting member 27 can yaw towards the side of the second groove section 2602, therefore, the convex column 2201 and the follower plate 26 are in sliding fit and finally reset to the initial position, that is, the end of the first groove section 2601 away from the second groove section 2602, and the first spring 23 returns to the compressed state.

[0065] In summary, the present application uses the cylinder 24 and the third piston disc 25 to monitor the pressure difference between the inside and the outside of the arc-shaped member 6 in real time. When a certain amount of displacement occurs in the third piston disc 25, that is, when the initial stage of air extraction should terminate, the energy storage structure can quickly release elastic potential energy, prompting the baffle 16 to switch the blocking state of the through hole 1401 to the conducting state. Utilizing the feature that the diameter of the second cylindrical cavity 1102 is larger than that of the first cylindrical cavity 1101, the later stage of air extraction is entered to achieve an automatic increase in the air extraction rate. Therefore, the present application innovatively adopts a mechanical interlock method to achieve automatic adjustment of the air extraction rate. The mechanical interlock structure is relatively simple and has a lower cost. In terms of accuracy, the mechanical interlock can more precisely control the air extraction rate. In terms of environmental adaptability, the mechanical interlock structure has stronger environmental adaptability and can work stably in various complex environments. In terms of maintenance difficulty, the maintenance of the mechanical interlock structure is relatively simple and convenient.

[0066] The present application realizes precise and stable control of the air extraction rate by means of a mechanically triggered structure, improves the reliability and efficiency of the air extraction process, reduces the maintenance cost and failure rate of the equipment, extends the service life of the equipment, and also helps to improve product quality and production efficiency, bringing higher economic benefits to the enterprise.

[0067] Please refer to again Figure 2 And Figure 3 , the multi-phase cooling mechanism includes a gas-phase cooling component and a liquid-phase cooling component provided on the support 1. The gas-phase cooling component includes a plurality of first rings 4 evenly distributed along the pipe fitting transmission direction, and the liquid-phase cooling component includes a plurality of second rings 5 evenly distributed along the pipe fitting transmission direction. Among them, a plurality of spray heads are provided on both the first ring 4 and the second ring 5, and the spray heads on the two are respectively used for blowing air and spraying water on the pipe fitting. The blowing temperature of the plurality of first rings 4 and the spraying temperature of the second ring 5 both decrease along the pipe fitting transmission direction.

[0068] In the working state, after the pipe fitting is extruded from the die head of the extrusion component 2, it will sequentially pass through a plurality of first rings 4. During this period, the first ring 4 will blow air on the pipe fitting to assist the pipe fitting to complete preliminary shaping, so as to ensure that the pipe fitting can smoothly enter between the two arc-shaped members 6 for forming annular corrugations. After the annular corrugations are formed, the pipe fitting will continue to move forward and pass through a plurality of second rings 5 in sequence, and the second ring 5 will spray water on the pipe fitting to complete the final cooling and shaping process.

[0069] More preferably, the spray heads on the second ring 5 adopt atomizing spray heads, and this design can ensure that the liquid droplets evenly cover the surface of the pipe fitting, thereby effectively guaranteeing the cooling effect.

[0070] In addition, the blowing temperature of the plurality of first annular bodies 4 and the water spraying temperature of the second annular body 5 both show a decreasing trend along the pipe fitting transmission direction. Such a setting method can effectively avoid a series of problems such as deformation and cracking caused by sudden cooling during the cooling process of the pipe fitting, and comprehensively guarantee the production quality of the pipe fitting.

[0071] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0072] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A corrugated tube conical twin-screw extruder with multiphase fluid cooperative cooling and shaping, comprising a support and an extrusion assembly arranged on the support; It is characterized in that Also includes: A multiphase cooling mechanism is arranged on the support; A circulating chain, one group of which is provided on each side of the support, wherein a plurality of arc-shaped parts with hollow interiors are provided on the circulating chain, and after the pipe fitting is extruded through the die head of the extrusion assembly, the circulating chain can cause the arc-shaped parts on both sides of the pipe fitting to close; The arc-shaped member is provided with a plurality of exhaust mechanisms capable of forming a negative pressure state inside the arc-shaped member, and the exhaust mechanism is also connected to a negative pressure detection mechanism. When the negative pressure detection mechanism is triggered, the exhaust rate of the exhaust mechanism can be increased; A plurality of partition plates are equidistantly arranged inside the arc-shaped member, so that a plurality of arc-shaped chambers are formed inside the arc-shaped member; a plurality of grooves are equidistantly arranged on the inner wall of the arc-shaped member, and an arc-shaped through groove communicating with the arc-shaped chambers is arranged on the inner wall of the groove; Wherein, the outer wall of the arc-shaped member is also provided with a plurality of arc-shaped conduits, and both ends of the arc-shaped conduits are communicated with the arc-shaped chamber and connected to the air extraction mechanism; The air extraction mechanism comprises a vertical plate fixed on the arc-shaped member and a cylinder fixed on the vertical plate, and the cylinder is connected to the arc-shaped conduit through a connecting pipe; Wherein, a first cylindrical cavity and a second cylindrical cavity are formed in the cylinder, and the diameter of the second cylindrical cavity is larger than the diameter of the first cylindrical cavity; The air extraction mechanism also includes: A suction assembly is disposed in the cylinder and connected to the negative pressure detection mechanism via a conduction control assembly; The suction assembly comprises a first piston disc and a second piston disc respectively sealingly and slidably disposed in the first cylindrical cavity and the second cylindrical cavity, and a cylinder is also mounted on the arc-shaped member, and a connecting plate is fixed to the movable end of the cylinder; Wherein, a through hole is provided on the first piston disc, the conduction control component can switch the conduction and blocking states of the through hole, a vertical shaft is rotatably mounted on the connecting plate, the vertical shaft is rotatably connected to the first piston disc and the second piston disc, and the vertical shaft is also connected to the conduction control component; The conduction control component includes a baffle fixed on the vertical shaft and sealingly slidingly fitted with the first piston disk, a transmission sleeve rotatably mounted on the vertical plate and slidingly fitted with the vertical shaft, a gear fixed on the transmission sleeve, the gear meshes with a toothed plate movably arranged on the cylinder through an energy storage structure, and the energy storage structure cooperates with the negative pressure detection mechanism.

2. The multiphase fluid cooperative cooling and shaping extruder for corrugated tube conical twin-screw extrusion according to claim 1, characterized in that: Two strip-shaped protrusions are formed on the outer wall of the vertical shaft, and two transmission grooves are provided on the inner wall of the transmission sleeve. The transmission grooves are matched with the strip-shaped protrusions, and the two are parallel to the central axis of the vertical shaft.

3. The multiphase fluid cooperative cooling and shaping extruder for corrugated tube conical twin-screw extrusion according to claim 1, characterized in that: An assembly plate with a hollow interior is fixedly provided on the outer wall of the cylinder, and the energy storage structure includes a slider slidably arranged in the assembly plate and fixedly connected to the tooth plate. A guide shaft that passes through the slider and is slidably connected to the slider is also fixed in the assembly plate, and a first spring is sleeved on the outer periphery of the guide shaft, and two ends of the first spring are respectively connected to the inner wall of the assembly plate and the slider, and a convex column is fixed on the slider, and the convex column cooperates with the negative pressure detection mechanism.

4. The multiphase fluid cooperative cooling and shaping extruder for corrugated tube conical twin-screw extrusion according to claim 3, characterized in that: The negative pressure detection mechanism comprises a cylinder fixed on the cylinder body and connected to the cylinder body, and a third piston disc sealed and slidably arranged in the cylinder through an elastic support structure, the third piston disc is fixedly connected to a follower plate through a connecting arm, the follower plate is provided with a groove body adapted to the boss, the boss extends into the groove body and is slidably connected to the follower plate; Among them, two lugs are fixed to the inner wall of the cylinder, and the elastic support structure includes two follower columns fixed on the third piston disk and respectively slidably connected to the two lugs, and a second spring is sleeved on the follower column, one end of the second spring is connected to the lug, and the other end is connected to a boss fixed on the follower column at one end away from the third piston disk.

5. The multiphase fluid cooperative cooling and shaping extruder for corrugated tube conical twin-screw extrusion according to claim 4, characterized in that: The trough body comprises a first trough section, a second trough section, a third trough section, a fourth trough section and a fifth trough section which are connected to each other, wherein the first trough section is collinear with the second trough section and parallel to the fourth trough section, and the third trough section is perpendicular to the second trough section; Among them, the fifth slot segment is arranged inclined, and its end away from the fourth slot segment is connected to the connection between the first slot segment and the second slot segment. A limiting member is also hinged on the follower plate, and the limiting member is located at the end of the fifth slot segment away from the fourth slot segment, and the rotating axis of the limiting member is connected to a torsion spring.

6. The multiphase fluid cooperative cooling and shaping extruder for corrugated tube conical twin-screw extrusion according to claim 5, characterized in that: The multiphase cooling mechanism comprises a gas phase cooling component and a liquid phase cooling component arranged on the support, the gas phase cooling component comprises a plurality of first ring bodies equidistantly distributed along the pipe transmission direction, and the liquid phase cooling component comprises a plurality of second ring bodies equidistantly distributed along the pipe transmission direction; Wherein, the first ring body and the second ring body are both provided with a plurality of nozzles, which are respectively used for blowing air and spraying water to the pipe fittings. The blowing temperature of the plurality of first ring bodies and the water spraying temperature of the second ring body both decrease along the transmission direction of the pipe fittings.

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