A device for improving the warp of large-diameter electrically fused pipe fittings

Abstract

This invention relates to the field of electrofusion pipe fitting processing equipment technology, and discloses a device for improving the warping of large-diameter electrofusion pipe fittings. The device includes a furnace body with two sets of parallel annular conveyor belts inside. Both conveyor belts are connected to a conveying drive mechanism. Multiple pipe fixing mechanisms for fixing the electrofusion pipe fittings to be processed are evenly spaced on the two conveyor belts. A pipe feeding mechanism is provided at the starting end of the conveying of the two conveyor belts, and a pipe unloading mechanism is provided at the end of the conveying of the two conveyor belts. Both the pipe feeding and unloading mechanisms are located outside the furnace body. The portions of the two conveyor belts inside the furnace body are connected to a rotary temperature control mechanism inside the furnace body for graded temperature control of the electrofusion pipe fittings during rotation. This allows for sequential and uniform cooling of each part of the electrofusion pipe fitting, resulting in better cooling and higher quality after annealing, effectively improving the warping problem of large-diameter electrofusion pipe fittings.

Description

Technical Field

[0001] This invention relates to the field of electrofusion pipe fitting processing equipment, and in particular to a device for improving wire warping in large-diameter electrofusion pipe fittings. Background Technology

[0002] Electrofusion fittings are plastic (polyethylene) pipe fittings that can be connected by melting the plastic with the temperature generated by an electric current. Currently, electrofusion fittings are widely used in the laying of pressure pipelines in many fields such as gas, water supply, and chemical industry. Electrofusion fittings have heating wires distributed on the inner wall of the pipe. When electricity is applied, the heating wires heat up and melt the plastic at both ends of the electrofusion fitting to achieve the connection of the pipes.

[0003] In the manufacturing process of electrofusion fittings, a plastic coating process is generally adopted. This process involves manually winding plastic-coated copper wire onto the surface of the mold core. Before winding, the first copper terminal is clamped onto the starting end of the copper heating coil. After winding, the second copper terminal is clamped onto the end of the copper heating coil. Then, the wired core is placed into the mold and subjected to high-pressure injection molding in an injection molding machine. After injection molding, a hydraulic demolding machine is used to separate the core from the product. Because the plastic coating has significant internal stress during the injection molding process, it shrinks considerably as the product cools naturally. This causes the copper wire to bulge and warp, which seriously affects the quality of the electrofusion fitting.

[0004] To address the aforementioned issues, existing technologies generally employ annealing to improve the warping problem caused by internal stress in the plastic-coated portion of electrofused pipe fittings. Annealing is a common process in material processing. Through annealing in an annealing furnace, the material undergoes a process of heating, holding, and cooling, which can effectively eliminate internal stress. However, temperature control, which affects the annealing quality, is crucial during the annealing process.

[0005] Temperature control during the cooling process is a crucial part of annealing quality control. The faster the cooling rate, the more uneven the cooling, resulting in greater stress and mold deformation. Therefore, many annealing furnaces now employ staged cooling, which significantly improves annealing quality. However, when electrofused tubing passes through the annealing furnace, the angle is generally fixed, inevitably leading to temperature differences between different parts of the tubing and causing uneven cooling. In view of this, we propose a device that can ensure more uniform temperature in all parts of the tubing during staged cooling, thereby effectively improving the problem of wire warping in large-diameter electrofused tubing. Summary of the Invention

[0006] The purpose of this invention is to provide a device for improving the warping of large-diameter electrofusion fittings. This device can achieve sequential and uniform cooling of each part of the electrofusion fitting, and has the advantages of better cooling effect and higher quality of the electrofusion fitting after annealing, thus effectively improving the warping problem of large-diameter electrofusion fittings.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] An apparatus for improving wire warping in large-diameter electrofusion fittings includes a furnace body. Two sets of annular conveyor belts are arranged parallel to each other inside the furnace body. Both annular conveyor belts are connected to a conveying drive mechanism. Multiple pipe fixing mechanisms for fixing the electrofusion fittings to be processed are evenly spaced on the two annular conveyor belts. A pipe feeding mechanism is provided at the starting end of the conveying of the two annular conveyor belts, and a pipe unloading mechanism is provided at the end of the conveying of the two annular conveyor belts. Both the pipe feeding mechanism and the pipe unloading mechanism are located outside the furnace body. The portions of the two annular conveyor belts inside the furnace body are respectively connected to a rotary grading temperature control mechanism inside the furnace body for graded temperature control of the electrofusion fittings during rotation.

[0009] By adopting the above technical solution, the two annular conveyor belts rotate synchronously under the drive of the conveying drive mechanism. When the two oppositely arranged pipe fixing mechanisms on the two annular conveyor belts move to the position directly below the pipe feeding mechanism, the pipe feeding mechanism automatically places the electrofusion fittings to be processed in the position opposite to the pipe fixing mechanism, so that the pipe fixing mechanism axially fixes the electrofusion fittings to be processed from both ends in sequence. At this time, each electrofusion fitting to be processed can be conveyed forward with the two annular conveyor belts and enter the furnace body in sequence. After entering the furnace body, the electrofusion fittings to be processed pass through the rotary grading temperature control mechanism, which controls the temperature. The mechanism sequentially performs graded cooling treatment on each electrofusion fitting to be processed until each fitting gradually cools from high temperature to ambient temperature. After cooling to ambient temperature, the fittings are detached from the two annular conveyor belts and the fitting fixing mechanism under the action of the pipe unloading mechanism. The entire process requires no manual operation and has a high degree of automation. Furthermore, the rotating graded temperature control mechanism continuously rotates around the circumference of the fittings during the cooling process, ensuring that each part of the fittings is cooled sequentially and uniformly, resulting in better cooling effect and higher quality after annealing. This effectively improves the problem of wire warping in large-diameter electrofusion fittings.

[0010] A further configuration of the present invention is as follows: the conveying drive mechanism includes a first driving pulley, a second driving pulley, a first driven pulley, and a second driven pulley, respectively used for tensioning and connecting two sets of annular conveyor belts. The first driving pulley and the second driving pulley are both connected to a drive shaft, which is connected to a conveying drive motor. The first driven pulley and the second driven pulley are both connected to a driven shaft. The first driving pulley and the second driving pulley are respectively connected to one end of the two annular conveyor belts, and the first driven pulley and the second driven pulley are respectively connected to the other end of the two annular conveyor belts. The two ends of the drive shaft and the driven shaft are respectively rotatably connected to side plates fixed on both sides of the furnace body, and the conveying drive motor is fixed on a side plate on one side of the furnace body.

[0011] By adopting the above technical solution, after the conveyor drive motor starts, it drives the drive shaft connected to it to rotate. When the drive shaft rotates, it drives the first and second drive pulleys to rotate synchronously. When the first and second drive pulleys rotate, they drive the two sets of annular conveyor belts to rotate cyclically around the first and second driven pulleys, thereby realizing the driving of the two sets of annular conveyor belts. This allows the two sets of annular conveyor belts to transport the electrofusion tubes at a certain speed and smoothly, so that the electrofusion tubes can enter the furnace body for graded cooling treatment.

[0012] A further provision of the present invention is that the pipe fixing mechanism includes pipe fixing shafts symmetrically arranged on two annular conveyor belts, and the sides of the pipe fixing shafts on the two annular conveyor belts that are far apart from each other are respectively axially slidingly engaged with adjusting cylinders fixed on the two annular conveyor belts. A return spring is provided inside the adjusting cylinder, one end of the return spring is fixed to the end of the pipe fixing shaft, and the other end of the return spring is fixed to the end of the adjusting cylinder.

[0013] The pipe fixing shaft is also provided with an end limiting plate for limiting the end of the electrofusion fitting to be processed. The end limiting plate is perpendicular to the axis of the pipe fixing shaft and is fixedly connected to the pipe fixing shaft.

[0014] By adopting the above technical solution, the pipe fixing mechanisms on the two sets of annular conveyor belts circulate with the two sets of annular conveyor belts. When one set of opposing pipe fixing mechanisms on the two sets of annular conveyor belts moves to the bottom of the pipe feeding mechanism, the pipe feeding mechanism places the electrofusion fitting to be processed between the two pipe fixing mechanisms. At this time, the pipe fixing shafts in the two pipe fixing mechanisms slide along the adjusting cylinder towards the electrofusion fitting under the action of the return spring and gradually insert from both ends of the electrofusion fitting into the inner cavity of the electrofusion fitting, realizing the radial limit of the electrofusion fitting. Until the limiting plates on the pipe fixing shafts in the two pipe fixing mechanisms abut against both ends of the electrofusion fitting, realizing the axial limit of the electrofusion fitting. Therefore, the electrofusion fitting is fixed between the two annular conveyor belts, allowing the electrofusion fitting to be conveyed forward with the two sets of annular conveyor belts. This not only enables the fixing operation of electrofusion fittings of different lengths, improving versatility, but also simplifies the fixing process and makes operation convenient.

[0015] A further feature of the present invention is that the pipe feeding mechanism includes a feeding hopper, the bottom of the feeding hopper is provided with a discharge port, the discharge port is provided with a discharge valve for controlling the opening and closing of the discharge port, and a position adjustment mechanism is provided on the side of the discharge port near the starting end of the two annular conveyor belts to adjust the position of the fixed shaft of the pipe on the two annular conveyor belts.

[0016] By adopting the above technical solution, the feeding hopper is used to accommodate the electrofusion fittings to be processed. When the pipe fixing mechanism on the two annular conveyor belts comes into contact with the adjusting mechanism, as the two annular conveyor belts continue to move, the pipe fixing shafts in the two pipe fixing mechanisms slide away from each other along the axis of the adjusting cylinder. During this process, the return springs in the two pipe fixing mechanisms accumulate spring force. When the pipe fixing shaft in the pipe fixing mechanism moves with the annular conveyor belt to directly below the feeding hopper, the two pipe fixing mechanisms separate from the adjusting mechanism. At the same time, the discharge valve at the bottom discharge port of the feeding hopper opens, allowing the electrofusion fittings in the feeding hopper to fall. When the pipe fixing mechanism separates from the adjusting mechanism, the pipe fixing shaft in the pipe fixing mechanism slides in the opposite direction along the adjusting cylinder under the action of the return spring, and inserts both ends of the electrofusion fitting falling from the feeding hopper into the inner cavity of the electrofusion fitting, thus fixing the electrofusion fitting.

[0017] A further feature of the present invention is that the pipe unloading mechanism includes an unloading plate, one end of which is opposite to the two annular conveyor belts, the upper surface of the unloading plate is lower than the upper surface of the two annular conveyor belts, and a second position adjustment mechanism for adjusting the position of the pipe fixing shaft on the two annular conveyor belts is provided on the side of the unloading plate near the starting end of the conveyor belts.

[0018] By adopting the above technical solution, when the pipe fixing mechanism on the two annular conveyor belts comes into contact with the second adjusting mechanism, as the two annular conveyor belts continue to move, the pipe fixing shafts in the two pipe fixing mechanisms slide away from each other along the axis of the adjusting cylinder. During this process, the pipe fixing shafts are gradually pulled out from both ends of the electrofusion fitting, so that both ends of the electrofusion fitting gradually separate from the two pipe fixing mechanisms and fall onto the unloading plate. The return spring in the pipe fixing mechanism accumulates elastic force during the process of the pipe fixing shaft being pulled out from both ends of the electrofusion fitting. After the electrofusion fitting falls onto the unloading plate, it returns to its initial position under the action of the return spring's rebound force and continues to rotate with the annular conveyor belt. The whole process is automatic and highly efficient.

[0019] A further feature of the present invention is that the positions adjusting mechanism one and the positions adjusting mechanism two have the same structure, both including a positions adjusting plate for adjusting the position of the pipe fixing shaft on the two conveyor belts. The positions adjusting plates in the positions adjusting mechanism one and the positions adjusting mechanism two are respectively fixed to the side plates on both sides of the furnace body by connecting plates. The positions adjusting plate is composed of an inclined section and a horizontal section, the inclined section and the horizontal section are integrally formed, and the inclined section and the horizontal section are arranged sequentially along the conveying direction of the annular conveyor belt.

[0020] By adopting the above technical solution, both position adjustment mechanism one and position adjustment mechanism two are used to adjust the position of the pipe fixing shaft, thereby realizing the fixing and loosening of the electrofusion fitting. When the pipe fixing shafts in the two pipe fixing mechanisms come into contact with the inclined sections of the position adjustment plates in the two position adjustment mechanisms one (or position adjustment mechanism two), the two pipe fixing shafts are continuously squeezed by the inclined sections of the position adjustment plates as they move with the two circular conveyor belts. This causes the two pipe fixing shafts to continuously overcome the spring force of the return spring under the action of the squeezing force and slide away from each other. When the pipe fixing shafts in the two pipe fixing mechanisms move to contact the horizontal sections of the position adjustment plates in the two position adjustment mechanisms one (or position adjustment mechanism two), the distance between the two pipe fixing shafts is the farthest (greater than the axial dimension of the electrofusion fitting). When the pipe fixing shafts in the two pipe fixing mechanisms move to separate from the horizontal sections of the position adjustment plates in the two position adjustment mechanisms one (or position adjustment mechanism two), the two pipe fixing shafts move towards each other under the action of the return spring.

[0021] A further configuration of the present invention is as follows: the rotary grading temperature control mechanism includes multiple temperature control units, each temperature control unit including multiple heating tubes arranged in a circumferential array, the two ends of the multiple heating tubes in each temperature control unit are respectively fixedly connected to two oppositely arranged toothed discs, the distance between the centers of the two toothed discs in two adjacent temperature control units matches the distance between the axes of two adjacent pipe fixing shafts on the two annular conveyor belts, each toothed disc meshes with rack one and rack two above and below it, the two sides of rack one and rack two are respectively slidably engaged with two transverse slide rails on the inner walls of the two sides of the furnace body, rack one and rack two are respectively connected to the telescopic shafts of drive cylinder one and drive cylinder two with opposite telescopic directions, drive cylinder one and drive cylinder two are respectively fixed on the side walls of the furnace body, each toothed disc is provided with a radially horizontally extending through groove, and the through grooves on adjacent toothed discs have the same orientation.

[0022] By adopting the above technical solution, after the electrofusion fitting is fixed by the pipe fixing mechanism, it enters the furnace body with the annular conveyor belt and passes through multiple temperature control sections in the rotary graded temperature control mechanism in sequence, thereby realizing the graded cooling of the electrofusion fitting. The heating tubes in each temperature control section are used to provide different temperature environments for the electrofusion fitting, so that the electrofusion fitting is cooled sequentially and uniformly during the movement with the annular conveyor belt. The specific process is as follows: First, the telescopic shafts of drive cylinder one and drive cylinder two are controlled to reciprocate synchronously at a set frequency. At the same time, the two annular conveyor belts are controlled to move in a stepping motion at a frequency matching the telescopic frequency of drive cylinder one and drive cylinder two. When the electrofusion fitting reaches the left side of the temperature control section, the drive cylinders are controlled to move in a stepping motion. The telescopic shafts of cylinder one and drive cylinder two extend synchronously by one stroke, thereby driving rack one and rack two to slide horizontally by one stroke. This causes each gear disc in each temperature control unit, which meshes with rack one and rack two, to rotate synchronously by 180°. This ensures that the through grooves on the gear discs in each temperature control unit face the direction opposite to the electrofusion fitting (to the left). Then, the two annular conveyor belts are controlled to move forward by one stroke, causing the electrofusion fitting on the left side of the temperature control unit to move along the through groove to the center of the gear disc. At this point, the circumferentially distributed heating tubes on the gear discs apply a certain temperature to the electrofusion fitting. Then, the telescopic shafts of drive cylinder one and drive cylinder two are controlled to slowly and synchronously retract by one stroke. During the retraction process, the telescopic shaft drives rack one and rack two to slide horizontally in opposite directions for one stroke, thereby causing each gear disc in each temperature control unit to rotate synchronously in the opposite direction by 180°. During this rotation, the gear discs drive each heating tube to rotate 180° circumferentially around the electrofusion tube at its center. During this rotation, each heating tube uniformly applies a certain temperature to all parts of the electrofusion tube at its center until the through groove on each gear disc rotates to the opposite direction (to the right). Then, the two annular conveyor belts are controlled to move forward one stroke and stop. At this point, the electrofusion tube at the center of each gear disc moves to the next position between its adjacent gear discs. The extension and retraction of drive cylinder one and drive cylinder two are then controlled again. Extending forward one stroke and repeating the above process allows the electrofusion fitting to be sequentially transferred to various temperature control sections for graded treatment at different temperatures until the electrofusion fitting reaches its natural temperature and is output from the furnace. The electrofusion fitting utilizes the rotation of the toothed disc to drive the heating tube to rotate around the circumference of the electrofusion fitting, thus achieving uniform cooling of the electrofusion fitting. At the same time, the reciprocating rotation of the toothed disc causes the orientation of the through groove to change 180°, thereby enabling the electrofusion fitting to be sequentially transferred to each temperature control section. This effectively solves the problem of interference between the rotational motion of the heating tube and the horizontal linear motion of the electrofusion fitting in each temperature control section. Uniform cooling can be achieved without rotating the electrofusion fitting throughout the process. The structure is simple and the design is ingenious.

[0023] A further configuration of the present invention is as follows: an air inlet is provided on the side of the furnace body near the pipe unloading mechanism, the air inlet being connected to an air intake fan; an air outlet is provided on the side of the furnace body near the pipe loading mechanism, the air outlet being connected to a hot air treatment mechanism; the hot air treatment mechanism includes a heat exchange chamber; a hot air inlet connected to the air outlet of the furnace body is provided on one side of the heat exchange chamber; an exhaust port for discharging the air after heat exchange is provided on the other side of the heat exchange chamber; a plurality of heat exchange tubes are provided in the heat exchange chamber; and a circulating heat exchange medium is provided in the heat exchange tubes.

[0024] By adopting the above technical solution, the air inlet is used to pass ambient temperature air into the furnace body. The ambient temperature air moves from one end of the furnace body against the conveying direction of the two annular conveyor belts to the other end of the furnace body and is discharged into the hot air treatment mechanism through the air outlet. The heat exchange medium (usually water or oil) circulating in the heat exchange tube absorbs heat, thereby realizing the heat exchange operation. On the one hand, it avoids the direct emission of hot air from causing environmental impact. On the other hand, the heat in the hot air can be collected by the heat exchange treatment mechanism for power generation or other purposes, thereby achieving the effect of rational energy utilization and effectively reducing energy loss. Moreover, the continuous introduction of ambient temperature air can also ensure the air circulation in the furnace body, thereby ensuring that the control temperature of each temperature control unit remains stable, which is conducive to improving the reliability of the staged cooling of electrofusion tubes.

[0025] The beneficial effects of this invention are:

[0026] 1. In this invention, two annular conveyor belts rotate synchronously under the drive of a conveying drive mechanism. When the two oppositely arranged pipe fixing mechanisms on the two annular conveyor belts move directly below the pipe feeding mechanism, the pipe feeding mechanism automatically places the electrofusion fittings to be processed in a position opposite to the pipe fixing mechanism, so that the pipe fixing mechanism sequentially fixes the electrofusion fittings axially from both ends. At this time, each electrofusion fitting to be processed can be sequentially conveyed forward by the two annular conveyor belts and enter the furnace body. After entering the furnace body, the electrofusion fittings to be processed pass through a rotary grading temperature control mechanism, which then controls the temperature according to the... Each electrofusion fitting undergoes a staged cooling process until it gradually cools from a high temperature to its ambient temperature. Once cooled to ambient temperature, the fittings are sequentially detached from the two annular conveyor belts and the fitting fixing mechanism by the pipe unloading mechanism. The entire process requires no manual operation and is highly automated. Furthermore, the rotating staged temperature control mechanism continuously rotates around the circumference of the electrofusion fitting during the cooling process, ensuring that each part of the fitting is cooled sequentially and uniformly, resulting in better cooling and higher quality after annealing. This effectively improves the problem of wire warping in large-diameter electrofusion fittings.

[0027] 2. In this invention, multiple temperature control sections utilize the rotation of each toothed disc to drive the heating tube to rotate circumferentially around the electrofusion tube, thereby achieving uniform cooling of the electrofusion tube. Simultaneously, during the reciprocating rotation of each toothed disc, the orientation of the through groove changes 180°, thus enabling the electrofusion tube to be sequentially transferred between each temperature control section. This effectively solves the problem of interference between the rotational motion of the heating tube and the horizontal linear motion of the electrofusion tube in each temperature control section. Uniform cooling can be achieved without rotating the electrofusion tube throughout the entire process, resulting in a simple structure and ingenious design.

[0028] 3. This invention introduces ambient temperature air into the furnace body through the air inlet. The ambient temperature air moves from one end of the furnace body against the conveying direction of the two annular conveyor belts to the other end of the furnace body and is discharged into the hot air treatment mechanism through the air outlet. The heat exchange medium (usually water or oil) circulating in the heat exchange tube absorbs heat, thereby realizing the heat exchange operation. On the one hand, it avoids the direct emission of hot air from impacting the environment. On the other hand, the heat in the hot air can be collected by the heat exchange treatment mechanism for power generation or other purposes, thereby achieving the effect of rational energy utilization and effectively reducing energy loss. Moreover, the continuous introduction of ambient temperature air can also ensure the air circulation in the furnace body, thereby ensuring that the control temperature of each temperature control unit remains stable, which is conducive to improving the reliability of the staged cooling of electrofusion tubes. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a longitudinal cross-sectional schematic diagram of a device for improving wire warping in large-diameter electrofusion pipe fittings according to the present invention.

[0031] Figure 2 This is a schematic diagram of the external structure of a device for improving wire warping in large-diameter electrofusion fittings according to the present invention.

[0032] Figure 3 This is a cross-sectional schematic diagram of a device for improving wire warping in large-diameter electrofusion pipe fittings according to the present invention.

[0033] Figure 4 yes Figure 3 A magnified view of part A in the diagram.

[0034] Figure 5 This is a schematic diagram showing the state of the electrofusion tube when it reaches the left side of the temperature control unit during the staged cooling process of the rotary graded temperature control mechanism in the device for improving the wire warping of large-diameter electrofusion tubes according to the present invention.

[0035] Figure 6 This is a schematic diagram showing the state of the rotary graded temperature control mechanism in the device for improving wire warping of large-diameter electrofusion tubes according to the present invention, when the through grooves on the toothed discs of each temperature control unit are facing the direction opposite to the electrofusion tube during the graded cooling process of the electrofusion tube.

[0036] Figure 7 This is a schematic diagram showing the state of the electrofusion tube on the left side of the temperature control unit when the rotating graded temperature control mechanism in the device for improving the warping of large-diameter electrofusion tubes of the present invention moves along the through groove to the center of the toothed disc during the graded cooling process of the electrofusion tube.

[0037] Figure 8 This is a schematic diagram showing the state of the rotary grading temperature control mechanism in the device for improving wire warping of large-diameter electrofusion pipe fittings during the grading cooling process of the electrofusion pipe fittings. The through grooves on each toothed disc rotate with the toothed disc to the opposite direction (to the right) from the original direction.

[0038] Figure 9 This is a schematic diagram showing the state of the electrofusion tube at the center of each toothed disc as it moves to the next position between its adjacent toothed disc during the process of graded cooling of the electrofusion tube in the rotary graded temperature control mechanism of the device for improving the warping of large-diameter electrofusion tubes according to the present invention.

[0039] In the diagram, 1. Furnace body; 2. Circular conveyor belt; 3. Conveying drive mechanism; 31. Driving pulley one; 32. Driving pulley two; 33. Driven pulley one; 34. Driven pulley two; 35. Drive shaft; 36. Conveying drive motor; 37. Driven shaft; 4. Electrofusion fitting; 5. Pipe fixing mechanism; 51. Pipe fixing shaft; 52. Adjusting cylinder; 53. Return spring; 54. End limiting plate; 6. Pipe feeding mechanism; 61. Feeding hopper; 62. Discharge port; 63. Discharge valve; 7. Pipe unloading mechanism; 71. Unloading plate; 8. Rotary graded temperature control mechanism; 81. Heating tube; 82. Gear disc; 83. Rack 1; 84. Rack 2; 85. Transverse slide rail; 86. Drive cylinder 1; 87. Drive cylinder 2; 88. Through slot; 9. Position adjustment mechanism 1; 91. Position adjustment plate; 92. Connecting plate; 10. Position adjustment mechanism 2; 11. Side plate; 12. Air inlet; 13. Air inlet fan; 14. Air outlet; 15. Hot air treatment mechanism; 151. Heat exchange chamber; 152. Hot air inlet; 153. Exhaust vent; 154. Heat exchange tube. Detailed Implementation

[0040] 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 embodiments of the present invention, and not all embodiments. 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.

[0041] like Figures 1-2 As shown, an apparatus for improving the warping of large-diameter electrofusion tube fittings includes a furnace body 1. Two sets of annular conveyor belts 2 are arranged in parallel inside the furnace body 1. Both annular conveyor belts 2 are connected to a conveying drive mechanism 3. Multiple tube fixing mechanisms 5 for fixing the electrofusion tube fittings 4 to be processed are arranged at equal intervals on the two annular conveyor belts 2. A tube feeding mechanism 6 is provided at the conveying start end of the two annular conveyor belts 2, and a tube unloading mechanism 7 is provided at the conveying end of the two annular conveyor belts 2. Both the tube feeding mechanism 6 and the tube unloading mechanism 7 are located outside the furnace body 1. The portions of the two annular conveyor belts 2 located inside the furnace body 1 are respectively connected to a rotary grading temperature control mechanism 8 inside the furnace body 1 for grading temperature control of the electrofusion tube fittings 4 during rotation.

[0042] Furthermore, the conveying drive mechanism 3 includes a first driving pulley 31, a second driving pulley 32, a first driven pulley 33, and a second driven pulley 34 for tensioning and connecting the two sets of annular conveyor belts 2. The first driving pulley 31 and the second driving pulley 32 are both connected to the drive shaft 35, which is connected to the conveying drive motor 36. The first driven pulley 33 and the second driven pulley 34 are both connected to the driven shaft 37. The first driving pulley 31 and the second driving pulley 32 are respectively connected to one end of the two annular conveyor belts 2, and the first driven pulley 33 and the second driven pulley 34 are respectively connected to the other end of the two annular conveyor belts 2. The two ends of the drive shaft 35 and the driven shaft 37 are rotatably connected to the side plates 11 fixed on both sides of the furnace body 1. The conveying drive motor 36 is fixed on the side plate 11 on one side of the furnace body 1.

[0043] Furthermore, such as Figure 1 and Figure 4 As shown, the pipe fixing mechanism 5 includes a pipe fixing shaft 51 symmetrically arranged on two annular conveyor belts 2. The pipe fixing shafts 51 on the two annular conveyor belts 2 that are far apart from each other are axially slidingly engaged with the adjusting cylinders 52 fixed on the two annular conveyor belts 2. A return spring 53 is provided inside the adjusting cylinder 52. One end of the return spring 53 is fixed to the end of the pipe fixing shaft 51, and the other end of the return spring 53 is fixed to the end of the adjusting cylinder 52.

[0044] Furthermore, the pipe fixing shaft 51 is also provided with an end limiting plate 54 for limiting the end of the electrofusion fitting 4 to be processed. The end limiting plate 54 is perpendicular to the axis of the pipe fixing shaft 51 and is fixedly connected to the pipe fixing shaft 51.

[0045] Furthermore, such as Figure 1 As shown, the pipe feeding mechanism 6 includes a feeding hopper 61, and a discharge port 62 is provided at the bottom of the feeding hopper 61. The discharge port 62 is provided with a discharge valve 63 for controlling the opening and closing of the discharge port 62. The discharge port 62 is provided with a position adjustment mechanism 9 on the side near the starting end of the two annular conveyor belts 2 to adjust the position of the pipe fixing shaft 51 on the two annular conveyor belts 2.

[0046] Furthermore, such as Figures 1-3 As shown, the pipe unloading mechanism 7 includes an unloading plate 71. One end of the unloading plate 71 is opposite to the two annular conveyor belts 2. The upper surface of the unloading plate 71 is lower than the upper surface of the two annular conveyor belts 2. The unloading plate 71 is provided with a position adjustment mechanism 2 10 for adjusting the position of the pipe fixing shaft 51 on the two annular conveyor belts 2 on the side of the unloading plate 71 near the starting end of the conveyor belt.

[0047] Furthermore, the positions adjusting mechanism 1 9 and the positions adjusting mechanism 2 10 have the same structure, both including a positions adjusting plate 91 for adjusting the position of the pipe fixing shaft 51 on the two conveyor belts. The positions adjusting plates 91 in the positions adjusting mechanism 1 9 and the positions adjusting mechanism 2 10 are respectively fixed to the side plates 11 on both sides of the furnace body 1 by connecting plates 92. The positions adjusting plate 91 is composed of an inclined section and a horizontal section, which are integrally formed. The inclined section and the horizontal section are arranged sequentially along the conveying direction of the annular conveyor belt 2.

[0048] Furthermore, such as Figure 1 As shown, the rotary grading temperature control mechanism 8 includes multiple temperature control sections, each of which includes multiple heating tubes 81 arranged in a circumferential array. The two ends of the multiple heating tubes 81 in each temperature control section are fixedly connected to two opposing toothed discs 82. The distance between the centers of the two toothed discs 82 in two adjacent temperature control sections matches the distance between the axes of two adjacent pipe fixing shafts 51 on the two annular conveyor belts 2. Each toothed disc 82 meshes with its upper and lower racks 83 and rack 84. The sides of racks 83 and rack 84 are slidably engaged with two transverse slide rails 85 on the inner walls of the furnace body 1. Racks 83 and rack 84 are connected to the telescopic shafts of drive cylinders 86 and 87 with opposite telescopic directions. Drive cylinders 86 and 87 are fixed on the side walls of the furnace body 1.

[0049] Furthermore, each toothed disc 82 is provided with a radially horizontally extending through groove 88, and the through grooves 88 on adjacent toothed discs 82 have the same orientation.

[0050] Furthermore, the furnace body 1 is provided with an air inlet 12 on the side near the pipe unloading mechanism 7, and the air inlet 12 is connected to the air intake fan 13. The furnace body 1 is provided with an air outlet 14 on the side near the pipe feeding mechanism 6, and the air outlet 14 is connected to the hot air treatment mechanism 15. The hot air treatment mechanism 15 includes a heat exchange chamber 151. One side of the heat exchange chamber 151 is provided with a hot air inlet 152 connected to the air outlet 14 of the furnace body 1. The other side of the heat exchange chamber 151 is provided with an exhaust port 153 for discharging the air after heat exchange. The heat exchange chamber 151 is provided with a plurality of heat exchange tubes 154, and the heat exchange tubes 154 are provided with circulating heat exchange medium.

[0051] The working principle of this invention: Two annular conveyor belts 2 rotate synchronously under the drive of the conveying drive mechanism 3. When the two oppositely arranged pipe fixing mechanisms 5 on the two annular conveyor belts 2 move to the position directly below the pipe feeding mechanism 6, the pipe feeding mechanism 6 automatically places the electrofusion fittings 4 to be processed in a position opposite to the pipe fixing mechanism 5, so that the pipe fixing mechanism 5 fixes the electrofusion fittings 4 axially from both ends of the fittings in turn. At this time, each electrofusion fitting 4 to be processed can be conveyed forward with the two annular conveyor belts 2 and enter the furnace body 1 in turn, and pass through the rotary grading temperature control mechanism 8 in turn. Multiple temperature control units are used to achieve graded cooling of the electrofusion fitting 4. The heating tube 81 in each temperature control unit is used to provide different temperature environments for the electrofusion fitting 4, so that the electrofusion fitting 4 is cooled sequentially and uniformly as it moves with the annular conveyor belt 2. The specific process is as follows: First, the telescopic shafts of drive cylinder 1 86 and drive cylinder 2 87 are controlled to reciprocate synchronously at a set frequency. At the same time, the two annular conveyor belts 2 are controlled to move in steps at a frequency that matches the telescopic frequency of drive cylinder 1 86 and drive cylinder 2 87. When the electrofusion fitting 4 reaches the left side of the temperature control unit ( Figure 5 As shown), the telescopic shafts of drive cylinder 86 and drive cylinder 87 extend synchronously by one stroke, thereby driving rack 83 and rack 84 to slide horizontally by one stroke. This causes each gear plate 82 in each temperature control unit, which meshes with rack 83 and rack 84, to rotate synchronously by 180°, so that the through grooves 88 on the gear plate 82 in each temperature control unit are all oriented towards the direction opposite to the electrofusion fitting 4 (to the left). Figure 6 As shown), then the two annular conveyor belts 2 are controlled to move forward one stroke, so that the electrofusion fitting 4, which reaches the left side of the temperature control unit, moves along the through groove 88 to the center of the toothed disc 82. Figure 7As shown), at this time, the heating tubes 81 distributed circumferentially on the toothed disc 82 apply a certain temperature to the electrofusion fitting 4. Then, the telescopic shafts of the drive cylinder 1 86 and the drive cylinder 2 87 are controlled to slowly and synchronously retract one stroke. During the retraction process, the telescopic shafts of the drive cylinder 1 86 and the drive cylinder 2 87 drive the rack 1 83 and the rack 2 84 to slide horizontally in opposite directions for one stroke, thereby causing each toothed disc 82 in each temperature control unit to rotate synchronously in the opposite direction by 180°. During the reverse rotation, the toothed disc 82 drives each heating tube 81 to rotate circumferentially around the electrofusion fitting 4 around its center electrofusion fitting 4 by 180°. During the rotation, each heating tube 81 uniformly applies a certain temperature to all parts of the electrofusion fitting 4 at its center until the through groove 88 on each toothed disc 82 rotates to the opposite direction (to the right). Figure 8 As shown), the two circular conveyor belts 2 are controlled to move forward one stroke and then stop. At this time, the electrofusion fitting 4 located at the center of each toothed disc 82 moves to the position between the next toothed disc 82 and its adjacent toothed disc 82. Figure 9 As shown, by controlling the extension and retraction axes of drive cylinder 86 and drive cylinder 87 to extend forward by one stroke and repeating the above process, the electrofusion tube 4 can be sequentially transferred to each temperature control unit for graded treatment at different temperatures until the electrofusion tube 4 reaches its natural temperature and is output from the furnace. The electrofusion tube 4 is uniformly cooled by the rotation of the toothed disc 82, which drives the heating tube 81 to rotate around the electrofusion tube 4. At the same time, the orientation of the through groove 88 changes 180° during the reciprocating rotation of the toothed disc 82, thereby realizing the sequential transfer of the electrofusion tube 4 to each temperature control unit. This effectively solves the problem of interference between the rotational motion of the heating tube 81 and the horizontal linear motion of the electrofusion tube 4 in each temperature control unit. Uniform cooling can be achieved without the electrofusion tube 4 rotating throughout the process. The structure is simple and the design is ingenious. After the rotating graded temperature control mechanism 8 sequentially performs graded cooling treatment on each electrofusion fitting 4 to be processed, each electrofusion fitting 4 to be processed gradually cools from high temperature to ambient temperature. After cooling to ambient temperature, the electrofusion fitting 4 is sequentially separated from the two annular conveyor belts 2 and the pipe fixing mechanism 5 under the action of the pipe unloading mechanism 7. The whole process does not require manual operation and has a high degree of automation. In addition, the rotating graded temperature control mechanism 8 continuously rotates around the electrofusion fitting 4 during the cooling process, so that each part of the electrofusion fitting 4 is cooled sequentially and uniformly, resulting in better cooling effect and higher quality of the electrofusion fitting 4 after annealing, thereby effectively improving the problem of wire warping in large-diameter electrofusion fittings 4.

Claims

1. A device for improving the sagging of large diameter electrofusion pipe fittings, comprising a furnace body (1), characterized in that: Two sets of annular conveyor belts (2) are arranged in parallel inside the furnace body (1). Both annular conveyor belts (2) are connected to the conveying drive mechanism (3). Multiple pipe fixing mechanisms (5) for fixing the electrofusion fittings (4) to be processed are arranged at equal intervals on the two annular conveyor belts (2). A pipe feeding mechanism (6) is provided at the beginning of the conveying of the two annular conveyor belts (2). A pipe unloading mechanism (7) is provided at the end of the conveying of the two annular conveyor belts (2). The pipe feeding mechanism (6) and the pipe unloading mechanism (7) are both located outside the furnace body (1). The part of the two annular conveyor belts (2) located inside the furnace body (1) is connected to the rotary grading temperature control mechanism (8) inside the furnace body (1) for grading the temperature of the electrofusion fittings (4) during the rotation process. The rotary grading temperature control mechanism (8) includes multiple temperature control sections, each of which includes multiple heating tubes (81) arranged in a circular array. The two ends of the heating tubes (81) in each temperature control section are fixedly connected to two opposing toothed discs (82). The distance between the centers of the two toothed discs (82) in adjacent temperature control sections matches the distance between the axes of two adjacent pipe fixing shafts (51) on the two annular conveyor belts (2). Each toothed disc (82) is respectively connected to... The upper and lower racks 1 (83) and 2 (84) mesh with each other. The sides of the racks 1 (83) and 2 (84) are respectively slidably engaged with the two transverse slide rails (85) on the inner walls of the furnace body (1). The racks 1 (83) and 2 (84) are respectively connected to the telescopic shafts of the drive cylinders 1 (86) and 2 (87) with opposite telescopic directions. The drive cylinders 1 (86) and 2 (87) are respectively fixed on the side walls of the furnace body (1).

2. The device for improving wire warping in large-diameter electrofusion fittings according to claim 1, characterized in that: The conveying drive mechanism (3) includes a first driving pulley (31), a second driving pulley (32), a first driven pulley (33), and a second driven pulley (34) for tensioning and connecting two sets of annular conveyor belts (2). The first driving pulley (31) and the second driving pulley (32) are both connected to a drive shaft (35), which is connected to a conveying drive motor (36). The first driven pulley (33) and the second driven pulley (34) are both connected to the driven shaft (35). 7) Connection: The first active pulley (31) and the second active pulley (32) are respectively connected to one end of the two annular conveyor belts (2), the first driven pulley (33) and the second driven pulley (34) are respectively connected to the other end of the two annular conveyor belts (2), the two ends of the drive shaft (35) and the driven shaft (37) are respectively rotatably connected to the side plates (11) fixed on both sides of the furnace body (1), and the conveyor drive motor (36) is fixed on the side plate (11) on one side of the furnace body (1).

3. The apparatus for improving the warp of large diameter electrically fused pipe according to claim 1, wherein: The pipe fixing mechanism (5) includes pipe fixing shafts (51) symmetrically arranged on two annular conveyor belts (2). The pipe fixing shafts (51) on the two annular conveyor belts (2) are axially slidingly engaged with the adjusting cylinders (52) fixed on the two annular conveyor belts (2) on opposite sides. A return spring (53) is provided inside the adjusting cylinder (52). One end of the return spring (53) is fixed to the end of the pipe fixing shaft (51), and the other end of the return spring (53) is fixed to the end of the adjusting cylinder (52).

4. A device for improving the weeping of large diameter electrofusion fittings according to claim 3, characterised in that: The pipe fixing shaft (51) is also provided with an end limiting plate (54) for limiting the end of the electrofusion fitting (4) to be processed. The end limiting plate (54) is perpendicular to the axis of the pipe fixing shaft (51) and is fixedly connected to the pipe fixing shaft (51).

5. A device for improving the splaying of large diameter electrofusion pipe fittings according to claim 4, wherein: The pipe feeding mechanism (6) includes a feeding hopper (61), and a discharge port (62) is provided at the bottom of the feeding hopper (61). The discharge port (62) is provided with a discharge valve (63) for controlling the opening and closing of the discharge port (62). The discharge port (62) is provided with a position adjustment mechanism (9) on the side near the starting end of the two annular conveyor belts (2) to adjust the position of the pipe fixing shaft (51) on the two annular conveyor belts (2).

6. A device for improving the splaying of large diameter electrofusion pipe fittings according to claim 5, wherein: The pipe unloading mechanism (7) includes an unloading plate (71), one end of which is opposite to the two annular conveyor belts (2). The upper surface of the unloading plate (71) is lower than the upper surface of the two annular conveyor belts (2). The unloading plate (71) is provided with a position adjustment mechanism two (10) on the side of the unloading plate (71) near the conveying end of the two annular conveyor belts (2) for adjusting the position of the pipe fixing shaft (51) on the two annular conveyor belts (2).

7. A device for improving the splaying of large diameter electrofusion pipe fittings according to claim 6, wherein: The structure of the first position adjustment mechanism (9) and the second position adjustment mechanism (10) is the same, both including a position adjustment plate (91) for adjusting the position of the pipe fixing shaft (51) on the two conveyor belts. The position adjustment plates (91) in the first position adjustment mechanism (9) and the second position adjustment mechanism (10) are respectively fixed on the side plates (11) on both sides of the furnace body (1) by connecting plates (92). The position adjustment plate (91) is composed of an inclined section and a horizontal section. The inclined section and the horizontal section are integrally formed. The inclined section and the horizontal section are arranged sequentially along the conveying direction of the annular conveyor belt (2).

8. The device for improving wire warping in large-diameter electrofusion pipe fittings according to claim 1, characterized in that: Each toothed disc (82) is provided with a radially horizontally extending through groove (88), and the through grooves (88) on two adjacent toothed discs (82) have the same orientation.

9. The device for improving wire warping in large-diameter electrofusion fittings according to claim 1, characterized in that: The furnace body (1) has an air inlet (12) on the side near the pipe unloading mechanism (7), the air inlet (12) is connected to the air inlet fan (13), the furnace body (1) has an air outlet (14) on the side near the pipe feeding mechanism (6), the air outlet (14) is connected to the hot air treatment mechanism (15), the hot air treatment mechanism (15) includes a heat exchange chamber (151), one side of the heat exchange chamber (151) is provided with a hot air inlet (152) connected to the air outlet (14) of the furnace body (1), the other side of the heat exchange chamber (151) is provided with an exhaust port (153) for discharging the air after heat exchange, the heat exchange chamber (151) is provided with a plurality of heat exchange tubes (154), and the heat exchange tubes (154) are provided with circulating heat exchange medium.

Images