Heat-shrinkable tube positive pressure expansion machine

Abstract

The present invention provides a positive pressure expansion machine for heat shrinkable tubes, which includes a frame, a wire feeding mechanism and a wire discharging mechanism arranged outside the frame. A hollow heating cylinder is provided inside the frame. An inner traction conveying mechanism is connected above the hollow heating cylinder, and an expansion mechanism is connected below the hollow heating cylinder. An outer traction conveying mechanism is arranged below the expansion mechanism. Through the mutual cooperation of the inner traction conveying mechanism and the outer traction conveying mechanism, the heat shrinkable tube quickly enters the hollow heating cylinder for heating, and is expanded and formed through the expansion mechanism, and finally is taken out to a designated position by the wire discharging mechanism. The hollow heating cylinder of this application heats the heat shrinkable tube in the hollow heating cylinder by means of the ceramic heating element being energized to generate heat, without the need for oil immersion to solve environmental protection problems. The internal pressure of the expansion mechanism is controlled by a high-precision proportional valve to form a pressure difference inside and outside the pipe to realize the expansion and forming of the pipe, without the need for a vacuum pump to generate vacuum negative pressure, solving the problem of workshop noise, and having the advantages of environmental protection, low cost, high production efficiency, etc.

Description

Technical Field

[0001] The present invention relates to a dilator, and more particularly to a positive pressure dilator for heat shrinkable tubes. Background Art

[0002] Currently, dilators are divided into wet dilators and dry dilators. Among them, the wet dilator heats the heat shrinkable tube by means of medium immersion heating, and the more common heating medium is glycerol. The dry dilator adopts the method of combining internal pressure and vacuum, but its disadvantages are as follows:

[0003] 1. Glycerol replacement causes serious environmental pollution;

[0004] 2. The use of a vacuum pump results in high noise in the workshop;

[0005] 3. The use of a vacuum pump leads to high production costs;

[0006] 4. The expansion of FEP pipes is unstable;

[0007] Therefore, it is necessary to provide a new positive pressure dilator for heat shrinkable tubes to solve the above technical problems. Summary of the Invention

[0008] To solve the above technical problems, the present invention provides a positive pressure dilator for heat shrinkable tubes that can expand heat shrinkable tubes in a way of oil-free and vacuum-free negative pressure, save production costs, be environmentally friendly, and ensure the expansion quality of the tubes.

[0009] The positive pressure dilator for heat shrinkable tubes provided by the present invention includes a frame, a wire feeding mechanism and a wire discharging mechanism arranged outside the frame. A hollow heating cylinder is provided inside the frame. An inner traction conveying mechanism is connected above the hollow heating cylinder, and an expansion mechanism is connected below the hollow heating cylinder. An outer traction conveying mechanism is arranged below the expansion mechanism. One end of the heat shrinkable tube to be expanded is wound on the wire feeding mechanism, and the other end enters the hollow heating cylinder for heating under the traction of the inner traction conveying mechanism, then undergoes expansion molding through the expansion mechanism, and is conveyed out of the frame under the traction of the outer traction conveying mechanism and is conveyed to a designated position through the wire discharging mechanism, where:

[0010] The inner traction conveying mechanism includes a mounting base, inner traction rollers, and a servo motor. There is a cavity inside the mounting base. Two horizontally arranged inner traction rollers are rotatably connected inside the cavity. A conveying space for the heat-shrinkable tube to be expanded is formed between the two inner traction rollers. The servo motor is fixedly connected to one side of the mounting base, and its output shaft is fixedly connected to any one of the two inner traction rollers to drive any one of the inner traction rollers to rotate. At the top of the cavity, there is an inner traction inlet for the heat-shrinkable tube to be expanded. There is a high-temperature resistant sealing rubber ring at the inner traction inlet. When the heat-shrinkable tube passes through the inner traction inlet, the connection between its outer surface and the sealing rubber ring is sealed to prevent external compressed air leakage during production. At the bottom of the cavity, there is an inner traction outlet for the heat-shrinkable tube to be expanded. The inner traction outlet is hermetically connected to the inlet of the hollow heating cylinder. There is an air inlet hole on the top of the mounting base that communicates with the cavity. External compressed air enters the hollow heating cylinder from the air inlet hole, making the air pressure inside the heat-shrinkable tube to be expanded the same as the air pressure inside the hollow heating cylinder.

[0011] A ceramic heating element is sleeved on the outer surface of the hollow heating cylinder. After the ceramic heating element is powered on, the heat it emits is transferred to the hollow pipe inside it, thereby heating the heat-shrinkable plastic tube inside the hollow pipe. There is also a heat insulation layer on the outer surface of the ceramic heating element.

[0012] The expansion mechanism is movably connected to the frame. It includes a die expansion tube, an expansion die outer sleeve sleeved on the outer surface of the die expansion tube, a die sizing tube, and a sizing die outer sleeve sleeved on the outer surface of the die sizing tube. One end of the expansion die outer sleeve is connected to the hollow heating cylinder through a flange, and the other end is connected to the sizing die outer sleeve. The inlet of the die expansion tube is hermetically connected to the outlet of the hollow heating cylinder, and the outlet of the die expansion tube is hermetically connected to the inlet of the die sizing tube. An exhaust hole communicating with the die expansion tube is opened on the upper part of the expansion die outer sleeve, and a muffler is provided on the exhaust hole. The external compressed air discharged from the exhaust hole makes the air pressure inside the heat-shrinkable tube to be expanded greater than the air pressure inside the die expansion tube. A cooling system is provided on the sizing die outer sleeve. The cooling system includes a plurality of cooling water rings sleeved on the sizing die outer sleeve, and a water nozzle joint connecting to the water source is opened on each cooling water ring.

[0013] Preferably, a fixed plate is installed inside the frame. There is a lifting mechanism on the fixed plate. The lifting mechanism includes guide shafts, a sliding plate, and a lifting drive device for driving the sliding plate to rise or fall. There are two groups of guide shafts. One end of each group of guide shafts is fixedly connected to the fixed plate, and the other end is slidably connected to the sliding plate. There are two groups of lifting drive devices. The two groups of lifting drive devices are installed on the upper surface of the fixed plate, and their power ends pass through the fixed plate and are fixedly connected to the sliding plate. The expansion die outer sleeve is fixedly connected to the sliding plate, and the sliding plate can drive the expansion die to move up or down under the action of the lifting drive device.

[0014] Preferably, a guiding mechanism is further provided on the mounting base. The guiding mechanism includes a guiding frame, guiding rollers, guiding wheels. The guiding frame inclines outwardly in two pieces at the top of the frame. The guiding rollers are rotatably arranged on the guiding frame; the guiding wheels are rotatably connected to the top of the mounting base, and the direction of rotation of the guiding wheels.

[0015] Preferably, the outer traction conveying mechanism includes an outer traction frame fixedly connected inside the frame, two conveying rubber rollers arranged side by side horizontally, and an outer traction transmission device fixedly connected to the outer traction frame. A transverse displacement chute is radially provided on the outer traction frame. A clamping screw is fixedly connected inside the transverse displacement chute. A transverse displacement slider is slidably connected to the clamping screw. Any one of the two conveying rubber rollers is rotatably connected to the transverse displacement slider; a space for conveying the heat shrinkable tube is formed between the two conveying rubber rollers arranged side by side horizontally; the outer traction transmission device drives the two conveying rubber rollers to rotate synchronously in opposite directions.

[0016] Preferably, the wire outlet mechanism includes a wire outlet clamping and traction assembly and a wire outlet base. The wire outlet base is arranged on one side of the frame. There is a wire outlet connected to it on one side of the frame. A wire outlet guiding roller is provided on the side of the wire outlet base away from the frame; there are two groups of wire outlet clamping and traction assemblies. The two groups of wire outlet clamping and traction assemblies are longitudinally arranged on the top of the wire outlet base. The distance between the two groups of wire outlet clamping and traction assemblies forms a conveying space for the heat shrinkable tube to pass through;

[0017] A gap adjusting device for adjusting the distance between the two groups of wire outlet clamping and traction assemblies is further provided on the top of the wire outlet base. The gap adjusting device includes two linkage rods, a transmission lead screw arranged between the two linkage rods, a mounting block, a connecting block, and a lifting slider connecting the two linkage rods and the transmission lead screw. The mounting block is fixedly connected to the top of the wire outlet base. The two linkage rods and the transmission lead screw are equidistantly arranged on the mounting block in a manner perpendicular to the mounting block; the tops of the two linkage rods and the transmission lead screw are connected through the connecting block; the lifting slider is arranged between the mounting block and the connecting block, and the connection between the lifting slider and the two linkage rods and the transmission lead screw is a sliding connection;

[0018] Mounting base plates are provided on the same side of the mounting block and the lifting slider. The two groups of wire outlet clamping and traction assemblies are respectively mounted on the corresponding mounting base plates;

[0019] The wire outlet clamping and traction assembly includes a conveyor belt, a servo motor, a first transmission shaft and a second transmission shaft rotatably connected to the mounting base plate; the conveyor belt is tensioned on the first transmission shaft and the second transmission shaft. The servo motor drives the first transmission shaft to rotate, thereby driving the conveyor belt to rotate.

[0020] Preferably, the wire outlet clamping and traction assembly further includes a bevel gear transmission mechanism, which includes a wire outlet main transmission rod, a driving spiral bevel gear, a first driven spiral bevel gear, a second driven spiral bevel gear, and a third driven spiral bevel gear. The wire outlet main transmission rod is rotatably connected to the wire outlet base, and a driven slider is provided at one end of the wire outlet main transmission rod extending out of the top of the wire outlet base. One end of the driven slider is fixedly connected to the mounting base plate on the lifting slider; the driving spiral bevel gear is fixedly connected to the output shaft of the servo motor; the first driven spiral bevel gear is fixedly connected to the wire outlet main transmission rod, and the first driven spiral bevel gear is meshed with the driving spiral bevel gear to drive the wire outlet main transmission rod to rotate; the third driven spiral bevel gears are respectively fixedly connected to the first transmission shafts of the two wire outlet clamping and traction assemblies; two second driven spiral bevel gears respectively meshed with the two third driven spiral bevels are also sleeved on the rotating rod, and one of the second driven spiral bevels is rotatably connected to the driven slider.

[0021] Preferably, an adjusting clamping handwheel is further fixedly connected to the top of the transmission lead screw. By rotating the adjusting clamping handwheel, the transmission lead screw rotates and drives the lifting slider to move up or down, so as to adjust the distance between the two wire outlet clamping and traction assemblies.

[0022] Preferably, the wire paying-off mechanism is a reel. A connecting rod is provided at the bottom of the rear side of the frame, and the reel is rotatably connected to the connecting rod. The heat shrinkable tube to be expanded is wound on the reel.

[0023] Preferably, two wire paying-off mechanisms, two wire outlet mechanisms, two hollow heating cylinders, two inner traction conveying mechanisms, two expansion mechanisms, and two outer traction conveying mechanisms are provided on the frame, and the two wire paying-off mechanisms, two wire outlet mechanisms, two hollow heating cylinders, two inner traction conveying mechanisms, two expansion mechanisms, and two outer traction conveying mechanisms are symmetrically arranged to realize synchronous expansion of two heat shrinkable tubes with different specifications.

[0024] Compared with the related art, the heat shrinkable tube positive pressure expansion machine provided by the present invention has the following beneficial effects:

[0025] 1. The oil-free and electric heating production solves the environmental protection problem;

[0026] 2. Without vacuum negative pressure, it solves the workshop noise problem;

[0027] 3. The cost of this equipment is one-fourth of the original oil expansion cost, saving production costs for enterprises;

[0028] 4. FEP pipes can be stably produced, solving the problem of FEP heat shrinkable tubes that were mainly imported in China before, and reducing production costs for user enterprises.

[0029] 5. Further improve the operation stability of the equipment and the working efficiency of the equipment. Description of the Drawings

[0030] Figure 1 Schematic diagram of the overall structure of the positive pressure expansion machine for heat shrinkable tubes provided by the present invention.

[0031] Figure 2 Schematic diagram of the structure of the positive pressure expansion machine for heat shrinkable tubes provided by the present invention from another angle.

[0032] Figure 3 is Figure 2 An enlarged schematic diagram of A in

[0033] Figure 4 Cross-sectional view of the expansion mechanism provided by the present invention.

[0034] Figure 5 Schematic diagram of the positional structure of the inner traction conveying mechanism, the hollow heating cylinder, the expansion mechanism and the outer traction conveying mechanism provided by the present invention.

[0035] Figure 6 Schematic diagram of the overall structure of the outer traction conveying mechanism provided by the present invention.

[0036] Figure 7 Schematic diagram of the structure of the outer traction conveying mechanism provided by the present invention from another angle.

[0037] Figure 8 Schematic diagram of the structure of the outer traction conveying mechanism provided by the present invention from another angle. Detailed implementation manners

[0038] 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 creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 Schematic diagram of the overall structure of the positive pressure expansion machine for heat shrinkable tubes provided by the present invention; Figure 2 Schematic diagram of the structure of the positive pressure expansion machine for heat shrinkable tubes provided by the present invention from another angle; Figure 3 is Figure 2 An enlarged schematic diagram of A in Figure 4 Schematic diagram of the connection structure of the inner traction conveying mechanism, the hollow heating cylinder, the expansion mechanism and the outer traction conveying mechanism provided by the present invention; Figure 5 Schematic diagram of the overall structure of the inner traction conveying mechanism provided by the present invention;Figure 6 Schematic diagram of the overall structure of the external traction conveying mechanism provided by the present invention; Figure 7 Another perspective structural diagram of the external traction conveying mechanism provided by the present invention; Figure 8 Another perspective structural diagram of the external traction conveying mechanism provided by the present invention. The heat shrinkable tube positive pressure expansion machine includes a frame 1, a wire pay-off mechanism 2 and a wire outlet mechanism 4 arranged outside the frame 1. A hollow heating cylinder 7 is provided inside the frame 1. An internal traction conveying mechanism 3 is connected above the hollow heating cylinder 7, and an expansion mechanism 5 is connected below the hollow heating cylinder 7. An external traction conveying mechanism 6 is arranged below the expansion mechanism 5. One end of the heat shrinkable tube to be expanded is wound on the wire inlet mechanism, and the other end enters the hollow heating cylinder 7 under the traction of the internal traction conveying mechanism 3 for heating, then undergoes expansion molding through the expansion mechanism 5, and finally is conveyed out of the frame 1 under the traction of the external traction conveying mechanism 6 and is conveyed to a designated position through the wire outlet mechanism 4;

[0040] In the specific implementation process, as Figures 1 - 8 shown:

[0041] The internal traction conveying mechanism 3 includes a mounting base 31, internal traction rollers and a servo motor 34. A cavity is provided inside the mounting base 31. Two laterally arranged internal traction rollers are rotatably connected inside the cavity. A conveying space for the heat shrinkable tube to be expanded to pass through is formed between the two internal traction rollers. The servo motor 34 is fixedly connected to one side of the mounting base 31, and its output shaft is fixedly connected to any one of the two internal traction rollers to drive any one of the internal traction rollers to rotate; An internal traction inlet 32 for the heat shrinkable tube to be expanded to enter is provided at the top of the cavity, and an internal traction outlet for the heat shrinkable tube to be expanded to output is provided at the bottom. The internal traction outlet is hermetically communicated with the inlet of the hollow heating cylinder 7; An air inlet hole 33 communicated with the cavity is provided at the top of the cavity. External pressure gas enters the hollow heating cylinder 7 from the air inlet hole 33, so that the air pressure inside the heat shrinkable tube to be expanded is the same as the air pressure inside the hollow heating cylinder 7 (when processing heat shrinkable tubes in this application, the gas inside the heat shrinkable tube and the gas inside the hollow heating cylinder 7 both use compressed air, and the pressure of the internal and external pressure gases of the heat shrinkable tube is controlled within 6 bar).

[0042] A ceramic heating element is sleeved on the outer surface of the hollow heating cylinder 7; after the ceramic heating element is energized, the heat it emits is transferred to the hollow pipe located inside it, thereby heating the heat shrinkable tube to be expanded inside the hollow pipe; A heat insulation layer is also provided on the outer surface of the ceramic heating element;

[0043] As can be seen from the above, in the internal traction conveying mechanism 3 of the present application, its mounting base 31 is provided at the top of the frame 1. A cavity is provided in the mounting base 31, and an air inlet hole 33 communicating with the cavity is provided at the top thereof. The inflation device is communicated with the air inlet hole 33, and gas is input into the cavity from the air inlet hole, and then the gas enters the hollow heating cylinder 7 from the internal traction outlet at the bottom of the cavity, so that the pressure in the hollow heating cylinder 7 is kept consistent with the internal pressure of the heat shrinkable tube to be expanded entering the hollow heating cylinder 7, avoiding the heat shrinkable tube to be expanded from deforming due to the internal pressure being greater than the external pressure during heating. It should be noted that before the heat shrinkable tube to be expanded is heated, the other end thereof is connected to an air compressor, and the air compressor fills gas into the inside of the heat shrinkable tube to be expanded, so that the internal pressure of the heat shrinkable tube to be expanded is consistent with the external pressure.

[0044] Moreover, the hollow heating cylinder 7 heats the heat shrinkable tube inside by means of the ceramic heating element being energized to generate heat, eliminating the need for glycerol immersion and solving the environmental protection problem;

[0045] Furthermore, the gas is input from the top to the bottom inside the hollow heating cylinder 7, effectively preventing the heat inside the hollow heating cylinder 7 from rising, being able to keep the temperature inside the hollow heating cylinder 7 uniform. Combining with the heat insulation layer built in the hollow heating cylinder 7, the overall temperature consistency of the hollow heating cylinder 7 can be maintained, enabling the heat shrinkable tube to be expanded to be quickly and uniformly heated when passing through the hollow heating cylinder 7.

[0046] In addition, the expansion mechanism 5 is movably connected to the frame 1, and it includes a die expansion tube 53, an expansion die outer sleeve 51 sleeved on the outer surface of the die expansion tube 53, a die sizing tube 54, and a sizing die outer sleeve 52 sleeved on the outer surface of the die sizing tube 54; one end of the expansion die outer sleeve 51 is connected to the hollow heating cylinder 7 through a flange 71, and the other end is connected to the sizing die outer sleeve 52; the inlet 56 of the die expansion tube 53 is hermetically communicated with the outlet of the hollow heating cylinder 7, and the outlet of the die expansion tube 53 is hermetically communicated with the inlet of the die sizing tube 54; an exhaust hole 55 communicating with the die expansion tube 53 is provided in the upper part of the expansion die outer sleeve 51, and a muffler 57 is provided on the exhaust hole 55; the exhaust hole 55 discharges the external pressure gas so that the air pressure inside the heat shrinkable tube to be expanded is greater than the air pressure in the die expansion tube 53; a cooling system is provided on the sizing die outer sleeve 52, and the cooling system includes a plurality of cooling water rings 1000 sleeved on the sizing die outer sleeve 52, and a water nozzle joint 1001 connecting to a water source is provided on each cooling water ring 1000. Specifically:

[0047] An exhaust hole 55 communicating with the mold expansion tube 53 is provided in the upper part of the expansion mold outer sleeve 51. The gas input from the air inlet hole 33 is discharged from the exhaust hole 55 after passing through the hollow heating cylinder 7, thereby reducing the pressure in the mold expansion tube 53. Therefore, when the heated heat shrinkable tube to be expanded is output from the outlet of the hollow heating cylinder 7 and enters the mold expansion tube 53 through the inlet 56 of the mold expansion tube 53, due to the pressure in the mold expansion tube 53 being lower than the internal pressure of the heat shrinkable tube to be expanded, a pressure difference inside and outside the heat shrinkable tube is formed, causing the heat shrinkable tube located inside the heat shrinkable tube expansion to expand and deform. There is no need for a vacuum pump to generate vacuum negative pressure, solving the problem of workshop noise; by controlling the internal pressure of the mold expansion tube 53, a stable and ideal pressure difference can be obtained, ensuring the stable production of FEP pipes, solving the problem of domestic FEP heat shrinkable tubes that were mainly imported before, and reducing the production cost for using enterprises.

[0048] As another embodiment of the present invention, the thermal insulation layer is thermally insulated by using environmentally friendly aluminum silicate fireproof thermal insulation cotton. The aluminum silicate fireproof thermal insulation cotton is filled in a 304 stainless steel shell, and the 304 stainless steel shell is sleeved on the outer surface of the ceramic heating element;

[0049] As another embodiment of the present invention, temperature controllers are further provided in the upper and lower parts of the hollow heating cylinder 7. The temperature controllers are connected to the power supply circuit and can accurately control the temperature inside the hollow heating cylinder.

[0050] As another embodiment of the present invention, the distance between the two inner traction rollers of this application can be adjusted according to the size of the product, and different speeds can be set according to different products during movement, so as to stably traction the heat shrinkable tube into the heating cylinder. Specifically: Two inner traction chutes are symmetrically provided in the cavity of the installation base 31. An inner traction slider is slidably arranged in the inner traction chute. One of the two inner traction rollers has its two ends respectively rotatably connected to a corresponding inner traction slider. By adjusting the positions of the two inner traction sliders at the two ends of the inner traction roller in the inner traction chute, the two inner traction rollers are moved away from or close to each other, realizing the adjustment of the distance between the two inner traction rollers.

[0051] As another embodiment of the present invention, an observation port and a movable sealing door for observing the internal situation of the cavity are further provided on the installation base 31 of this application, which is convenient for operators to repair and handle abnormalities.

[0052] Furthermore, a guiding mechanism 8 is also provided on the mounting base 31. The guiding mechanism 8 includes a guiding frame 81, guiding rollers 82, and guiding wheels 83. Two guiding frames 81 are inclined outward at the top of the frame 1. The guiding rollers 82 are rotatably arranged on the guiding frames 81; the guiding wheels 83 are rotatably connected to the top of the mounting base 31, and the guiding wheels 83 rotate in a certain direction. Accordingly, the inner traction conveying mechanism 3 pulls the heat shrinkable tube to be expanded to move. The heat shrinkable tube to be expanded can enter the hollow heating cylinder 7 more smoothly and accurately under the guidance of the guiding rollers 82 and the guiding wheels 83, and it is not easy to wear the heat shrinkable tube to be expanded.

[0053] In order to better improve the applicable range of the equipment and solve the convenience of processing heat shrinkable tubes of different sizes by the equipment. At the same time, it is convenient for workers to perform later maintenance work, including threading the tube and replacing the tube during expansion. For example, Figure 5 as shown, the following preferred technical solutions are provided:

[0054] As another embodiment of the present application, a fixing plate 11 is installed in the frame 1. A lifting mechanism 100 is provided on the fixing plate 11. The lifting mechanism 100 includes guide shafts 101, a sliding plate 102, and a lifting drive device 103 for driving the sliding plate to rise or fall; there are two groups of guide shafts 101, and one end of each group of guide shafts 101 is fixedly connected to the fixing plate 11, and the other end is slidably connected to the sliding plate 102; there are two groups of lifting drive devices 103, and the two groups of lifting drive devices 103 are installed on the upper surface of the fixing plate 11, and their power ends pass through the fixing plate 11 and are fixedly connected to the sliding plate 102. The sliding plate 102 can rise or fall under the action of the lifting drive device 103; the lifting drive device in this embodiment is a cylinder.

[0055] Accordingly, the expanding mechanism 5 can make a lifting movement in the frame 1 under the drive of the lifting mechanism 100, which is convenient for workers to replace the tube and thread the tube during the later stage, and replace the mold in the expanding mechanism 5 to process heat shrinkable tubes of different sizes. The lifting mechanism uses two cylinders to work simultaneously to ensure the stability of the operation of the lifting mechanism 100.

[0056] In order to better solve the problem that the heat shrinkable tube conveying process has a high dependence on the work experience of workers. If during the conveying process, due to the accuracy of the clamping and conveying position spacing of the heat shrinkable tube, the heat shrinkable tube is prone to position deviation or stagnation, affecting the product quality and work efficiency. For example, Figure 5 as shown, the following preferred technical solutions are provided:

[0057] Specifically, the external traction conveying mechanism 6 includes an external traction frame 61 fixedly connected to the frame 1, two conveying rubber rollers 62 arranged side by side in a transverse direction, and an external traction transmission device fixedly connected to the external traction frame 61. A transverse sliding groove 63 is radially provided on the external traction frame 61, and a clamping screw 64 is horizontally arranged in the transverse sliding groove 63. One end of the clamping screw 64 extends out of the external traction frame 61. A transverse sliding block is slidably connected to the clamping screw 64. Rotating the clamping screw 64 can drive the transverse sliding block to move horizontally. Any of the two conveying rubber rollers 62 is rotatably connected to the transverse sliding block; a transverse sliding block is formed between the two conveying rubber rollers 62 arranged side by side in a transverse direction. The space for heat shrink tube transportation is located just below the outlet of the mold sizing tube 54 in the expansion mechanism 5. The operator can drive the conveying rubber roller on the transverse sliding block to move horizontally relative to the other conveying rubber roller by rotating the clamping screw to extend the end outside the external traction frame 61 (even if the transverse sliding block moves, the position of a conveying rubber roller 62 fixed to the transverse sliding block can be adjusted to make it close to or away from the other conveying rubber roller 62), so as to adjust the distance between the two conveying rubber rollers 62 to form a space for heat shrink tube transportation, so as to adapt to the transportation of heat shrink tubes of different sizes; the external traction transmission device drives the two conveying rubber rollers 62 to rotate synchronously in the opposite direction. In this application, the external traction transmission device is a servo motor.

[0058] During operation, the inner traction and conveying mechanism 3 and the outer traction and conveying mechanism 6 are distributed up and down and cooperate with each other to pull the heat shrink tube to be expanded into the cavity, so that the heat shrink tube to be expanded can quickly enter the hollow heating tube 7 vertically for heating and be quickly and accurately brought into the expansion mechanism 5 for expansion processing and shaping. It is not easy to deviate from the conveying position, thereby improving production efficiency.

[0059] In order to solve the technical problems of the existing heat shrink tube positive pressure expansion machine, which has many processes and high operating intensity of the staff, such as Figures 6 - 8 As shown, the following preferred technical solutions are provided:

[0060] The outlet mechanism 4 includes two groups of outlet clamping and pulling components 41 and an outlet base 42. The outlet base 42 is arranged on one side of the frame 1. One side of the frame 1 is provided with an outlet port 12 connected thereto. The two groups of outlet clamping and pulling components are arranged longitudinally on the top of the outlet base 42. The distance between the two groups of outlet clamping and pulling components forms a conveying space 4200 for the heat shrink tube to pass through. The outlet base 42 is rotatably connected to a side away from the frame 1 with an outlet guide roller 43. The expanded heat shrink tube is output through the conveying space 4200 between the two groups of outlet clamping and pulling components and then brought out to a designated position along the outlet guide roller 43.

[0061] In addition, a gap adjusting device 44 for adjusting the distance between two sets of wire outlet clamping and traction components is further provided at the top of the wire outlet base 42. The gap adjusting device 44 includes two linkage rods (401, 403), a transmission lead screw 402 arranged between the two linkage rods (401, 403), a mounting block 4004, an adapter block 4002, and a lifting slider 4003 connecting the two linkage rods (401, 403) and the transmission lead screw 402. The mounting block 4004 is fixedly connected to the top of the wire outlet base 42. The two linkage rods (401, 403) and the transmission lead screw 402 are arranged on the mounting block 4004 at equal distances in a manner perpendicular to the mounting block 4004. The tops of the two linkage rods (401, 403) and the transmission lead screw 402 are connected through the adapter block 4002. The lifting slider 4003 is arranged between the mounting block 4004 and the adapter block 4002, and the connection between the lifting slider 4003 and the two linkage rods (401, 403) and the transmission lead screw 402 is a sliding connection.

[0062] Mounting bases 404 are provided on the same side of the mounting block 4004 and the lifting slider 4003, and two sets of wire outlet clamping and traction components are respectively mounted on the corresponding mounting bases 404.

[0063] The wire outlet clamping and traction component includes a conveyor belt 410, a servo motor 34, a first transmission shaft 411 and a second transmission shaft 412 rotatably connected to the mounting base 404. The conveyor belt 410 is tensioned between the first transmission shaft 411 and the second transmission shaft 412, and the servo motor 34 drives the first transmission shaft 411 to rotate, thereby driving the conveyor belt 410 to rotate.

[0064] As another embodiment of the present invention, the wire outlet clamping and traction assembly further includes a bevel gear transmission mechanism. The bevel gear transmission mechanism includes a wire outlet main transmission rod 4005, a driving spiral bevel gear 431, a first driven spiral bevel gear 432, a second driven spiral bevel gear 434, and a third driven spiral bevel gear 433. The wire outlet main transmission rod 4005 is rotatably connected to the wire outlet base 42, and a driven slider 4006 is provided at one end of the wire outlet main transmission rod 4005 extending out of the top of the wire outlet base 42. One end of the driven slider 4006 is fixedly connected to the mounting base plate 404 on the lifting slider 4003; the driving spiral bevel gear 431 is fixedly connected to the output shaft of the servo motor 34; the first driven spiral bevel gear 432 is fixedly connected to the wire outlet main transmission rod 4005, and the first driven spiral bevel gear 432 is meshed with the driving spiral bevel gear 431 to drive the wire outlet main transmission rod 4005 to rotate; the third driven spiral bevel gears 433 are respectively fixedly connected to the first transmission shafts 411 of the two wire outlet clamping and traction assemblies; two second driven spiral bevel gears 434 meshed with the two third driven spiral bevel gears 433 are also sleeved on the rotating rod, and one of the second driven spiral bevel gears 434 is rotatably connected to the driven slider 4006, and the other second driven spiral bevel gear 434 is rotatably connected to the wire outlet base 42.

[0065] Further, an adjusting clamping handwheel 4001 is also fixedly connected to the top of the transmission lead screw 402. By rotating the adjusting clamping handwheel 4001, the transmission lead screw 402 rotates, and drives the lifting slider 4003 to move upward or downward, so as to adjust the width of the conveying space for heat shrinkable tubes of different sizes to pass through.

[0066] Further, the wire pay-off mechanism 2 is a reel. A connecting rod is provided at the bottom of the rear side of the frame 1, and the reel is rotatably connected to the connecting rod. The heat shrinkable tube to be expanded is wound on the reel.

[0067] In order to better improve the production efficiency of the equipment, as Figure 1 shown, the following preferred technical solutions are provided:

[0068] Two wire pay-off mechanisms 2, two wire outlet mechanisms 4, two hollow heating cylinders 7, two inner traction conveying mechanisms 3, two expansion mechanisms 5, and two outer traction conveying mechanisms 6 are provided on the frame 1, and the two wire pay-off mechanisms 2, two wire outlet mechanisms 4, two hollow heating cylinders 7, two inner traction conveying mechanisms 3, two expansion mechanisms 5, and two outer traction conveying mechanisms 6 are all symmetrically arranged to realize synchronous expansion of two heat shrinkable tubes of different specifications, and the efficiency is more than twice that of the original equipment.

[0069] As described above, for various types of heat shrinkable tubes (such as PVDF, FEP, PFA, fluororubber, double-wall or single-wall heat shrinkable tubes), the present application leads them from the pay-off reel mechanism through the inner traction conveying mechanism 3 to the top of the frame 1, and then guides them into the inner traction inlet 32 by the guide wheel 83 of the inner traction conveying mechanism 3. The tubing moves vertically downward from the inner traction inlet 32, passes through, and enters the hollow heating cylinder 7 through the inlet pipe of the hollow heating cylinder 7. After the ceramic heating element outside the hollow heating cylinder 7 is powered on, it heats the heat shrinkable tube in the hollow heating cylinder 7 at a high temperature (it should be noted that the hollow heating cylinder 7 is heated at different temperatures according to different products before working. When the temperature in the heating tube reaches the predetermined temperature of the material properties, the heat shrinkable tube enters the hollow heating cylinder 7 for heating). The heated heat shrinkable tube enters the die expansion tube 53 from the inlet 56 of the die expansion tube 53, and the air compressor is used to start the pressure inside and outside the die expansion tube 53 to expand the heat shrinkable tube. The expanded heat shrinkable tube enters the die sizing tube 54 for cooling and sizing. The outer traction conveying mechanism 6 leads the heat shrinkable tube out of the frame 1 and transports it to the designated position through the wire outlet mechanism 4.

[0070] The present application has the advantages of high efficiency, energy conservation, and environmental protection; it does not use oil to heat products and does not use a negative pressure vacuum pump during production. It is 1 / 4 of the production cost of traditional wet expansion, 1 / 5 of the production cost of positive pressure oil expansion, and 1 / 2 of the production cost of dry negative pressure electrothermal expansion. The present application achieves oil-free and vacuum-negative-pressure-free production, no noise, reduced sewage discharge, provides an excellent environment for the workshop, and reduces environmental impact assessment. Moreover, it improves production capacity. For the same product, the production capacity is increased by 30% in oil expansion, 100% in negative pressure electrothermal expansion, and 50% in positive pressure expansion, etc. Moreover, this equipment has two production lines and can expand two identical or different products simultaneously, which is worthy of promotion.

[0071] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. Heat shrinkable tube positive pressure expansion machine, including a frame and a wire feeding mechanism and a wire discharging mechanism arranged outside the frame. A hollow heating cylinder is arranged inside the frame. An inner traction conveying mechanism is connected above the hollow heating cylinder, and an expansion mechanism is connected below the hollow heating cylinder. An outer traction conveying mechanism is arranged below the expansion mechanism. One end of the heat shrinkable tube to be expanded is wound on the wire feeding mechanism, and the other end enters the hollow heating cylinder under the traction of the inner traction conveying mechanism for heating, then undergoes expansion molding through the expansion mechanism, and is conveyed out of the frame under the traction of the outer traction conveying mechanism and is conveyed to a designated position through the wire discharging mechanism. It is characterized in that: The wire feeding mechanism is a reel. A connecting rod is arranged at the bottom of the rear side of the frame, and the reel is rotatably connected to the connecting rod. The reel is wound with the heat shrinkable tube to be expanded; The inner traction conveying mechanism includes a mounting base, inner traction rollers and a servo motor. A cavity is arranged inside the mounting base. Two laterally arranged inner traction rollers are rotatably connected inside the cavity. A conveying space for the heat shrinkable tube to be expanded to pass through is formed between the two inner traction rollers. The servo motor is fixedly connected to one side of the mounting base, and its output shaft is fixedly connected to any one of the two inner traction rollers to drive any one of the inner traction rollers to rotate; An inner traction inlet for the heat shrinkable tube to be expanded to enter is arranged at the top of the cavity. There is a high-temperature resistant sealing rubber ring at the inner traction inlet. When the heat shrinkable tube passes through the inner traction inlet, the connection between its outer surface and the sealing rubber ring is sealed to prevent external compressed air leakage during production; An inner traction outlet for the heat shrinkable tube to be expanded to output is arranged at the bottom of the cavity, and the inner traction outlet is hermetically communicated with the inlet of the hollow heating cylinder; An air inlet hole communicating with the cavity is arranged at the top of the mounting base, and external compressed air enters the hollow heating cylinder from the air inlet hole, so that the air pressure inside the heat shrinkable tube to be expanded is the same as the air pressure inside the hollow heating cylinder; A guiding mechanism is further arranged on the mounting base. The guiding mechanism includes a guiding frame, guiding rollers, guiding wheels. Two guiding frames are inclined outwards on the top of the frame, and the guiding rollers are rotatably arranged on the guiding frames; The guiding wheels are rotatably connected to the top of the mounting base, and the rotating direction of the guiding wheels; A ceramic heating element is sleeved on the outer surface of the hollow heating cylinder; After the ceramic heating element is powered on, the heat it emits is transferred to the hollow pipe located inside it, and then the heat shrinkable plastic tube to be expanded inside the hollow pipe is heated; A heat insulation layer is also arranged on the outer surface of the ceramic heating element; The expansion mechanism is movably connected to the frame. It includes a die expansion tube, an expansion die outer sleeve sleeved on the outer surface of the die expansion tube, a die sizing tube, and a sizing die outer sleeve sleeved on the outer surface of the die sizing tube. One end of the expansion die outer sleeve is connected to the hollow heating cylinder through a flange, and the other end is connected to the sizing die outer sleeve. The inlet of the die expansion tube is hermetically communicated with the outlet of the hollow heating cylinder, and the outlet of the die expansion tube is hermetically communicated with the inlet of the die sizing tube. An exhaust hole communicating with the die expansion tube is provided in the upper part of the expansion die outer sleeve, and a muffler is provided on the exhaust hole. The exhaust hole discharges the external pressure gas so that the air pressure in the heat shrinkable tube to be expanded is greater than the air pressure in the die expansion tube. A cooling system is provided on the sizing die outer sleeve. The cooling system includes a plurality of cooling water rings sleeved on the sizing die outer sleeve, and a water nozzle joint connecting to a water source is provided on each cooling water ring.

2. The positive pressure expansion machine for heat shrinkable tubes according to claim 1, wherein A fixing plate is installed in the frame. A lifting mechanism is provided on the fixing plate. The lifting mechanism includes a guide shaft, a sliding plate, and a lifting driving device for driving the sliding plate to rise or fall. There are two groups of guide shafts. One end of each of the two groups of guide shafts is fixedly connected to the fixing plate, and the other end is slidably connected to the sliding plate. There are two groups of lifting driving devices. The two groups of lifting driving devices are installed on the upper surface of the fixing plate. Their power ends pass through the fixing plate and are fixedly connected to the sliding plate. The expansion die outer sleeve is fixedly connected to the sliding plate. The sliding plate can drive the expansion die to move up or down under the action of the lifting driving device.

3. The positive pressure expansion machine for heat shrinkable tubes according to claim 1, wherein The external traction conveying mechanism includes an external traction frame fixedly connected in the frame, two conveying rubber rollers arranged horizontally side by side, and an external traction transmission device fixedly connected to the external traction frame. A horizontal translation chute is radially provided on the external traction frame. A clamping screw is horizontally arranged in the horizontal translation chute. One end of the clamping screw extends outside the external traction frame. A horizontal translation sliding block is slidably connected to the clamping screw. Rotating the clamping screw can drive the horizontal translation sliding block to move horizontally. Any one of the two conveying rubber rollers is rotatably connected to the horizontal translation sliding block. A space for conveying the heat shrinkable tube is formed between the two horizontally arranged conveying rubber rollers. The external traction transmission device drives the two conveying rubber rollers to rotate synchronously in opposite directions.

4. The positive pressure expansion machine for heat shrinkable tubes according to claim 1, characterized in that: The wire outlet mechanism includes a wire outlet clamping and traction assembly, a wire outlet driving device, and a wire outlet base. The wire outlet base is arranged on one side of the frame. An outlet is provided on one side of the frame and is communicated with it. A wire outlet guiding roller is provided on the side of the wire outlet base away from the frame. There are two groups of wire outlet clamping and traction assemblies. The two groups of wire outlet clamping and traction assemblies are longitudinally arranged on the top of the wire outlet base. The distance between the two groups of wire outlet clamping and traction assemblies forms a conveying space for the heat shrinkable tube to pass through. A wire outlet guiding roller is rotatably connected to the side of the wire outlet base away from the frame. The expanded heat shrinkable tube is output through the conveying space between the two groups of wire outlet clamping and traction assemblies and then taken out to a designated position along the wire outlet guiding roller. A clearance adjustment device for adjusting the distance between two sets of wire outlet clamping and traction assemblies is also provided at the top of the wire outlet base. The clearance adjustment device includes two linkage rods, a transmission lead screw arranged between the two linkage rods, a mounting block, a connecting block, and a lifting slider connecting the two linkage rods and the transmission lead screw. The mounting block is fixedly connected to the top of the wire outlet base. The two linkage rods and the transmission lead screw are equidistantly arranged on the mounting block perpendicular to the mounting block; the tops of the two linkage rods and the transmission lead screw are connected through the connecting block; the lifting slider is arranged between the mounting block and the connecting block, and the connection between the lifting slider and the two linkage rods and the transmission lead screw is a sliding connection; Mounting bases are provided on the same side of the mounting block and the lifting slider, and two sets of wire outlet clamping and traction assemblies are respectively mounted on the corresponding mounting bases; The wire outlet clamping and traction assembly includes a conveyor belt, a servo motor, a first transmission shaft and a second transmission shaft rotatably connected to the mounting base; the conveyor belt is tensioned on the first transmission shaft and the second transmission shaft, and the servo motor drives the first transmission shaft to rotate, thereby driving the conveyor belt to rotate.

5. The positive pressure expansion machine for heat shrinkable tubes according to claim 4, characterized in that: The wire outlet clamping and traction assembly further includes a bevel gear transmission mechanism. The bevel gear transmission mechanism includes a wire outlet main transmission rod, a driving spiral bevel gear, a first driven spiral bevel gear, a second driven spiral bevel gear, and a third driven spiral bevel gear. The wire outlet main transmission rod is rotatably connected to the wire outlet base, and a driven slider is provided at one end of it extending out of the top of the wire outlet base. One end of the driven slider is fixedly connected to the mounting base on the lifting slider; the driving spiral bevel gear is fixedly connected to the output shaft of the servo motor; a first driven spiral bevel gear is fixedly connected to the wire outlet main transmission rod, and the first driven spiral bevel gear is meshed and connected with the driving spiral bevel gear to drive the wire outlet main transmission rod to rotate; third driven spiral bevels are respectively fixedly connected to the first transmission shafts of the two sets of wire outlet clamping and traction assemblies; two second driven spiral bevels respectively meshed with the two third driven spiral bevels are also sleeved on the rotating rod, and one of the second driven spiral bevels is rotatably connected to the driven slider, and the other second driven spiral bevel is rotatably connected to the wire outlet base.

6. The positive pressure expansion machine for heat shrinkable tubes according to claim 5, wherein A regulating clamping handwheel is further fixedly connected to the top of the transmission lead screw. By rotating the regulating clamping handwheel, the transmission lead screw rotates and drives the lifting slider to move up or down, so as to adjust the distance between the two sets of wire outlet clamping and traction assemblies.

7. The positive pressure expansion machine for heat shrinkable tubes according to claim 1, characterized in that, Two sets of wire pay-off mechanisms, two sets of wire outlet mechanisms, two sets of hollow heating cylinders, two sets of inner traction conveying mechanisms, two sets of expanding mechanisms, and two sets of outer traction conveying mechanisms are provided on the frame, and the two sets of wire pay-off mechanisms, two sets of wire outlet mechanisms, two sets of hollow heating cylinders, two sets of inner traction conveying mechanisms, two sets of expanding mechanisms, and two sets of outer traction conveying mechanisms are symmetrically arranged to synchronously expand heat shrinkable tubes of two different specifications.

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