A plastic pipe interface external thread forming device

Abstract

The present invention relates to a device for forming external threads of plastic pipe interfaces, and belongs to the technical field of thread forming equipment for plastic pipe interfaces. The present invention includes a frame, on which a material storage mechanism and a conveying mechanism are provided, as well as a thermoforming mechanism and a positioning mechanism. The thermoforming mechanism includes a supporting sleeve, a heating rod and a forming mold. The supporting sleeve is used to be inserted into the plastic pipe to support the plastic pipe; the heating rod is coaxial with the supporting sleeve and is used to be inserted into the supporting sleeve to heat the plastic pipe; the forming mold includes two forming modules symmetrically arranged on the left and right sides of the supporting sleeve, and the inner side walls of the two forming modules are both provided with half-section thread protrusions. The positioning mechanism is used to clamp the plastic pipe conveyed to the thermoforming mechanism, and to move the plastic pipe so that the plastic pipe remains coaxial with the supporting sleeve. The present invention can avoid significant deformation of the plastic pipe after being heated and softened, and the thread forming quality is better.

Description

Technical Field

[0001] The invention relates to the technical field of plastic pipe interface thread forming equipment, in particular to a plastic pipe interface external thread forming device. Background Art

[0002] Plastic pipes are widely used in modern construction, industry, agriculture, and municipal engineering due to their excellent corrosion resistance, lightness, and ease of installation and maintenance. During their use, plastic pipes often require external threads to facilitate connection and sealing.

[0003] There are various ways to process threads on the joints of plastic pipes. Among them, processing the external threads at the joints of plastic pipes by thermoforming is a more special processing method. Compared with other processing methods such as injection molding and mechanical cutting, processing the external threads at the joints of plastic pipes by thermoforming can reduce material waste, improve production efficiency, and make the resulting products have better surface quality.

[0004] The steps for thermoforming the external threads at the joints of plastic pipes typically involve first heating the joint end of the plastic pipe to soften the plastic, then applying pressure to the plastic pipe through a mold to form the end into the shape of the external threads. Prior art thermoforming of plastic pipe joints typically involves using dedicated molding equipment, such as patent publication number CN110076985B, which discloses an externally threaded hot extrusion molding machine for fire extinguisher siphon pipes. The molding machine includes a thread molding assembly mounted on a frame for extruding the plastic pipe joint, a preheating assembly for heating the plastic pipe joint, and a conveying assembly for combing the plastic pipes and feeding them into groups to the preheating assembly for heating and the thread molding assembly for thread molding.

[0005] This forming machine can process threads on the ends of plastic pipes and has high production efficiency. However, the preheating component and the thread forming component in the forming machine are independent of each other and have a certain distance between them. The plastic pipe is first preheated at the preheating component and then transported to the thread forming component for thread forming. Since the plastic pipe will soften after the preheating treatment, the softened plastic pipe is easily deformed under the action of gravity during the process of moving to the thread forming component. When the deformed plastic pipe is thread-formed at the thread forming component, it is easy for the processed threads to have different depths and uneven pitches, which affects the quality of thread forming and affects the subsequent assembly of plastic pipes. Summary of the Invention

[0006] The present invention provides a device for forming external threads of a plastic pipe interface, so as to solve the technical problem that when processing external threads of a plastic pipe external thread hot extrusion molding machine in the prior art, the preheating component and the molding component are independent of each other and have a gap between them, resulting in the plastic pipe being unable to be extruded and molded in time after being heated and softened, and being easily deformed under the action of gravity, thereby affecting the quality of the thread molding.

[0007] To solve the above problems, the present invention provides a plastic pipe interface external thread forming device adopting the following technical solutions:

[0008] A device for forming external threads of a plastic pipe interface includes a frame, a storage mechanism for storing plastic pipes, and a conveying mechanism for conveying the plastic pipes from left to right. The frame is also provided with a thermoforming mechanism and a positioning mechanism. The thermoforming mechanism includes:

[0009] The supporting sleeve has an axis extending in the front-to-back direction, can move forward and backward on the frame, and is used to be inserted into the plastic pipe to support the plastic pipe;

[0010] The heating rod is coaxial with the supporting sleeve and can move forward and backward on the frame, and is used to be inserted into the supporting sleeve to heat the plastic pipe;

[0011] The forming die comprises two forming modules with semicircular cross-sections, symmetrically arranged on the left and right sides of the support sleeve. The inner sidewalls of the two forming modules are each provided with a half-segment threaded protrusion. The two forming modules can synchronously move toward or away from each other in the left and right directions. When the two forming modules abut against each other, they can cooperate with the support sleeve to enclose a threaded cavity for extruding the interface end of the plastic tube.

[0012] The positioning mechanism is used to clamp the plastic tube transported to the thermoforming mechanism and move the plastic tube so that the plastic tube and the supporting sleeve remain coaxial.

[0013] With this technical solution, when the plastic tube moves to the thermoforming mechanism, the positioning mechanism clamps the tube and moves it coaxially with the support sleeve. The support sleeve is then inserted into the plastic tube in a forward-backward direction to support it. The heating rod is then inserted into the support sleeve to heat the plastic tube. Because the support sleeve supports the plastic tube, it prevents the plastic tube from sagging under gravity after being softened by heat, causing significant deformation. The support sleeve also prevents heat from the heating rod from being directly transferred to the plastic tube, preventing excessive heating temperatures.

[0014] After the plastic tube is heated, the two molding modules approach each other and extrude the end of the softened plastic tube, forming an external thread on the outer wall of the plastic tube. During this process, the softened plastic tube is supported by the support sleeve, and the position of the plastic tube does not change. Compared with the existing technology, the plastic tube does not need to be moved from the heating station to the extrusion molding station. After heating, the plastic tube can be extruded at the same station, which makes the connection between the heating and extrusion molding processes more coherent. After the plastic tube is softened, it can be extruded immediately. This not only improves production efficiency, but also avoids the problem of the softened plastic tube being left unsupported for a long time and thus undergoing significant deformation due to gravity. The deformation of the plastic tube after heating and softening is reduced, the depth of the processed thread is more consistent, the pitch is more uniform, and the quality of the formed thread is better. At the same time, the heating mechanism and the extrusion molding mechanism are concentrated in one place, which also makes the equipment structure more simple.

[0015] Furthermore, the thermoforming mechanism also includes a movable frame and a movable frame driving mechanism. The support sleeve is fixedly connected to the movable frame. The two forming modules are installed on the movable frame for left and right guiding sliding. The movable frame can be driven by the movable frame driving mechanism and move along the front and back direction toward the plastic tube clamped by the positioning mechanism, so that the support sleeve is inserted into the plastic tube.

[0016] Furthermore, an extrusion drive mechanism is provided on the movable frame, which includes an extrusion cylinder, a pressure block, a moving block and two connecting rods. The extrusion cylinder has a driving output end that can move back and forth. The pressure block is connected to the driving output end of the extrusion cylinder. The pressure block is located between the extrusion cylinder and the forming mold. There are two moving blocks, and the two moving blocks are respectively connected to the two forming modules. The two moving blocks are both guided and slidably installed on the movable frame along the left and right directions. The two connecting rods are symmetrically arranged on the left and right sides of the supporting sleeve. One end of the connecting rod is hinged to the pressure block around the vertically extending rotation axis, and the other end is hinged to the moving block on the corresponding side around the vertically extending rotation axis. The spacing size of the hinge points of the two connecting rods on the pressure block is smaller than the spacing size of the hinge points of the two connecting rods on the two moving blocks.

[0017] By adopting the above technical solution, when the extrusion cylinder drives the pressing block to move toward the forming mold, the two connecting rods can be used to drive the two moving blocks away from each other, thereby driving the two forming modules away from each other. When the extrusion cylinder drives the pressing block to move away from the forming mold, the two connecting rods can be used to drive the two moving blocks synchronously close to each other, that is, drive the two forming modules synchronously close to each other. The synchronous mutual approach and synchronous separation of the two forming modules are achieved through the unidirectional drive of an extrusion cylinder. The driving structure is relatively simple, and there is no need to set up two driving structures to drive the two forming modules separately, which can save power costs.

[0018] Furthermore, the heating rod is connected to the pressing block, and when the extrusion cylinder drives the pressing block to move toward the forming mold, it can drive the heating rod to be inserted into the supporting sleeve.

[0019] By adopting the above technical solution, when the extrusion cylinder drives the pressing block to move toward the forming mold, it can not only drive the two forming modules to move away from each other synchronously, exposing the support sleeve to facilitate the insertion of the support sleeve into the plastic tube, but also enable the heating rod to be inserted into the support sleeve to heat the plastic tube. When the extrusion cylinder drives the pressing block to move away from the forming mold, it can not only drive the two forming modules to move toward each other synchronously to extrude the softened plastic tube, but also drive the heating rod to leave the support sleeve to facilitate the cooling of the formed plastic tube. The movement of the pressing block toward the forming mold or away from the forming mold can drive the forming mold and the heating rod to move synchronously. There is no need to drive the movement of the heating rod and the forming module separately. The structure is simpler and more clever, which can save power costs.

[0020] Furthermore, an extrusion ring that can move forward and backward is provided on the movable frame, and the extrusion ring is mounted on the supporting sleeve. The extrusion ring is located on the side of the forming mold close to the movable frame and is opposite to the front and back of the threaded cavity. The pull rod is a telescopic rod. The pull rod can be driven by the extrusion cylinder and lengthened after the two forming modules are abutted, so that the pressure block can be driven by the extrusion cylinder after the two forming modules are abutted and continue to move back to the forming mold. The pressure block is connected to the extrusion ring in a transmission manner, and the extrusion ring can be driven by the pressure block moving back to the forming mold to move toward the threaded cavity.

[0021] By adopting the above technical solution, by setting the pull rod as a telescopic rod, after the two forming modules abut against each other, the extrusion cylinder can still drive the pressure plate to continue to move back to the forming mold. By setting an extrusion ring and connecting the extrusion ring with the pressure block, the pressure block can drive the extrusion ring toward the threaded cavity while continuing to move back to the forming mold, so that the extrusion ring is pressed tightly against the end of the plastic tube. During the extrusion molding of the plastic tube, the melted part of the plastic tube is pressed toward the threaded cavity, so that the threaded part of the plastic tube is denser after molding and the structural strength is higher.

[0022] Furthermore, the movable frame is a box structure, the support sleeve is connected to the outer wall of the movable frame and communicates with the inner cavity of the movable frame, an air inlet is provided on the side wall of the movable frame, a cooling fan is installed at the air inlet, and the cooling fan can blow air toward the inner cavity of the movable frame through the air inlet.

[0023] By adopting the above technical solution, the movable frame is a box structure, and the inner cavity of the support sleeve is connected to the inner cavity of the movable frame. The wind blown into the inner cavity of the movable frame by the cooling fan can be blown into the plastic tube through the support sleeve, thereby accelerating the cooling speed of the formed plastic tube.

[0024] Furthermore, the conveying mechanism includes two sets of conveying chain assemblies arranged symmetrically in front and back. The conveying chain assembly includes a chain and a support block connected to the chain. The support block is provided with a groove with an opening facing away from the chain for placing the plastic pipe.

[0025] By adopting the above technical solution, the plastic pipe can be placed in the grooves on the two front-to-back symmetrical support blocks and transported to the right, making the transport process smoother.

[0026] Furthermore, the storage mechanism includes a storage box, which is provided with a storage cavity. The bottom of the storage cavity is connected to a vertically extending discharge cavity for storing multiple plastic tubes stacked up and down. The width of the discharge cavity is adapted to the outer diameter of the plastic tube to be processed. The bottom of the discharge cavity is provided with a support plate for supporting the bottom of the plastic tube in the discharge cavity. The left end of the support plate is elastically hinged to the frame around a rotation axis extending forward and backward. The right end of the support plate is higher than the left end. The left groove wall of the groove in the support block located on the upper half of the chain is higher than the right groove wall. When the support block moves to the right, the left groove wall of the groove can push the support plate downward by pushing the bottom plastic tube to the right, thereby pulling the plastic tube out from the bottom of the discharge cavity and falling into the groove.

[0027] By adopting the above technical solution, each time the support block moves to the bottom of the discharge chamber, it can pull out a plastic tube and drive the plastic tube to move to the right. The remaining plastic tubes fall downward under the action of gravity to achieve feeding, thereby realizing automatic loading of plastic tubes and improving production efficiency.

[0028] Furthermore, the width of the discharge cavity can be adjusted to accommodate plastic tubes of different outer diameters. The thermoforming mechanism is provided with multiple groups adapted to accommodate plastic tubes of different outer diameters, and the thermoforming mechanism can be detachably mounted on the frame.

[0029] By adopting the above technical solution, external threads can be processed on plastic pipes with different outer diameters, and the scope of application is wider.

[0030] Furthermore, the positioning mechanism includes a lifting drive and a clamping assembly connected to the lifting output end of the lifting drive, the clamping assembly includes a bottom clamping roller and two end clamping rollers arranged symmetrically above the bottom clamping roller, the bottom clamping roller is used to support the bottom of the plastic pipe, the bottom clamping roller can move upward, and the two end clamping rollers can synchronously approach each other when the bottom clamping roller moves upward to clamp the plastic pipe between the bottom clamping roller and the two end clamping rollers.

[0031] By adopting the above technical solution, the clamping assembly can clamp the plastic pipe to be processed, and the lifting drive can adjust the height of the clamped plastic pipe, so that the plastic pipe to be processed and the supporting sleeve remain coaxial.

[0032] The advantageous effect of the device for forming external threads for plastic pipe joints provided by the present invention is that it integrates a heating mechanism and an extrusion-forming mechanism into an integrated structure. This allows the plastic pipe to be extruded immediately after heating, thus preventing significant deformation of the heated pipe and improving the quality of the formed threads. Furthermore, by providing an extrusion ring to squeeze the plastic pipe within the threaded cavity, the formed threads become denser and the structural strength of the threaded portion of the plastic pipe is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the three-dimensional structure of a plastic pipe interface external thread forming device provided by the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure at point A in the middle;

[0035] Figure 3 for Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0036] Figure 4 This is a front view of a device for forming external threads of a plastic pipe interface provided by the present invention;

[0037] Figure 5 This is a right side view of a plastic pipe interface external thread forming device provided by the present invention;

[0038] Figure 6 A top view of a device for forming external threads of a plastic pipe interface provided by the present invention;

[0039] Figure 7 A cross-sectional view of a device for forming external threads of a plastic pipe interface provided by the present invention;

[0040] Figure 8 for Figure 7 A magnified schematic diagram of the structure at C in the middle;

[0041] Figure 9 This is a structural schematic diagram of a positioning mechanism in a plastic pipe interface external thread forming device provided by the present invention;

[0042] Figure 10 A schematic diagram of the three-dimensional structure of a thermoforming mechanism in a plastic pipe interface external thread forming device provided by the present invention;

[0043] Figure 11 A cross-sectional view of a thermoforming mechanism in a plastic pipe interface external thread forming device provided by the present invention Figure 1 ;

[0044] Figure 12A cross-sectional view of a thermoforming mechanism in a plastic pipe interface external thread forming device provided by the present invention Figure 2 .

[0045] Description of reference numerals:

[0046] 1. Frame; 101. Connecting port; 102. Movable perforation; 2. Collection box; 3. Square housing; 301. Locking hole; 302. Feeding port; 4. Support plate; 401. Inclined plate segment 1; 402. Inclined plate segment 2; 5. Chain; 6. Support block; 7. Sprocket; 8. Drive motor; 9. Support frame; 10. Cooling fan; 11. Movable frame; 12. Extrusion cylinder; 13. Support sleeve; 14. Forming module; 15. Moving block; 16. Connecting rod; 17. Support; 171. Support part; 18. Clamping arm; 19. Support plate; 20. Lifting cylinder; 2 1. Baffle; 22. Adjustment plate; 221. Inclined plate section three; 222. Straight plate section; 23. Support plate; 24. Elastic part three; 25. Winding drum; 26. Connecting rod two; 27. Elastic part one; 28. Guide rod; 29. ​​Connecting rod one; 30. Bottom pressure roller; 31. End pressure roller; 32. Vertical push block; 321. Inclined side wall; 33. Clamping cylinder; 34. Heating rod; 35. Pressure block; 36. Drive ring; 37. Extrusion rocker; 38. L-shaped connecting rod; 39. Transmission screw; 40. Transmission plate; 41. Extrusion ring; 42. Rocker arm; 43. Locking bolt. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0048] The following is one embodiment of a device for forming an external thread of a plastic pipe interface provided by the present invention:

[0049] like Figures 1-12 As shown, a plastic pipe interface external thread forming device includes a frame 1, a material storage mechanism, a conveying mechanism, a thermoforming mechanism and a positioning mechanism.

[0050] like Figure 1 、 Figure 2As shown, the rack 1 is arranged on a horizontal surface. It is a rectangular box-like structure, extending longitudinally from side to side. The left and right ends of the top sidewalls of the rack 1 are provided with communication ports 101 that connect to the interior of the rack 1. The top sidewalls of the rack 1 also have a movable through-hole 102 located between the two communication ports 101. A support frame 9 is detachably connected to the front sidewall of the rack 1 via connecting bolts, and the position of the support frame 9 corresponds to the position of the movable through-hole 102. A retractable collection box 2 is located at the bottom right side of the rack 1, facing the communication port 101 on the right side. The collection box 2 is used to collect processed plastic pipes.

[0051] The material storage mechanism includes a material storage box, an adjustment component, a baffle component and a support component.

[0052] like Figure 1 、 Figure 7 、 Figure 8 As shown, the storage box includes a square shell 3 and a supporting plate 4. The top and bottom ends of the square shell 3 are open. The square shell 3 is connected to the top of the frame 1 and is located above the communication port 101 on the left side of the frame 1. Figure 1 、 Figure 3 As shown, a plurality of circular locking holes 301 are provided on the rear side wall of the square housing 3, and a rectangular feeding port 302 is provided at the bottom of the right side wall. Figure 8 As shown, a second connecting rod 26 extending forward and backward is connected between the front and rear side walls of the square housing 3.

[0053] like Figure 7 、 Figure 8 As shown, the supporting plate 4 is located in the square shell 3. The supporting plate 4 includes an inclined plate segment 1 401 and an inclined plate segment 2 402 which are connected sequentially from left to right. The left end of the inclined plate segment 1 401 is lower than the top surface of the square shell 3. The inclined plate segment 1 401 and the inclined plate segment 2 402 are both inclined downward from left to right. The downward inclination of the inclined plate segment 2 402 is greater than the downward inclination of the inclined plate segment 1 401. A gap is provided between the right end of the inclined plate segment 2 402 and the right inner wall of the square shell 3.

[0054] The space above the supporting plate 4 in the square housing 3 forms a storage cavity for storing plastic tubes.

[0055] like Figure 7 、 Figure 8As shown, the adjustment assembly includes an adjustment plate 22 and an adjustment plate drive assembly. Two adjustment plates 22 are symmetrically arranged front to back. The adjustment plates 22 comprise a slanted plate segment 3 221 and a straight plate segment 222, which connect from left to right. The slanted plate segment 3 221 and the slanted plate segment 2 402 maintain the same inclination angle. The adjustment plates 22 are located to the lower right of the slanted plate segment 2 402. A connecting rod 1 29 extending forward and backward connects the top ends of the two adjustment plates 22, connecting the two adjustment plates 22 integrally via the connecting rod 1 29, which is located to the right of the aforementioned connecting rod 2 26. A gap exists between the straight plate segment 222 and the right inner wall of the square housing 3. This gap forms a discharge cavity for the plastic pipe to be discharged downward.

[0056] like Figure 8 As shown, the left side of connecting rod 1 29 is vertically connected to a guide rod 28 extending left and right. The guide rod 28 slides left and right on connecting rod 2 26. An elastic member 27 is connected between connecting rod 1 29 and connecting rod 2 26. The elastic member 27 is a compression spring that can be extended and retracted in the left and right directions. The elastic member 27 is sleeved on the outside of the guide rod 28.

[0057] The adjusting plate driving member includes a connecting shaft, a winding drum 25 and a rocker arm 42 .

[0058] The connecting shaft extends in the front-to-back direction, is rotatably mounted on the square housing 3 and is located on the left side of the second connecting rod 26 , and the rear end of the connecting shaft extends to the outside of the square housing 3 .

[0059] There are two winding drums 25, both of which are fixed and sleeved on the outside of the connecting shaft. The two winding drums 25 are arranged at intervals in front and back. A pull wire 1 is wound on the winding drum 25, and the end of the pull wire 1 passes through the connecting rod 26 and is connected to the connecting rod 1 29.

[0060] like Figure 3 As shown, a rocker arm 42 is connected to the rear end of the connecting shaft and is located outside the square housing 3. A locking bolt 43 is inserted through the end of the rocker arm 42, facing away from the rotating shaft, so that it can move forward and backward. A second elastic member is connected between the locking bolt 43 and the rocker arm 42. This elastic member is a tension spring that can expand and contract in the forward and backward direction. When the elastic member is in its neutral position, the locking bolt 43 is inserted into the locking hole 301. By pulling the locking bolt 43 backward, the locking bolt 43 can be removed from the locking hole 301, allowing the rocker arm 42 to rotate freely about the axis of the connecting shaft, thereby allowing the locking bolt 43 to be inserted into any locking hole 301.

[0061] When the rocker arm 42 is rotated clockwise, the connecting shaft and the winding drum 25 mounted on the connecting shaft can be driven to rotate, so that the pull wire is wound around the winding drum 25, and the pull wire drives the connecting rod 29 and the two adjustment plates 22 to move to the left, thereby increasing the width of the discharge chamber so that the discharge chamber can be suitable for plastic pipes of different diameters.

[0062] The baffle assembly includes two baffles 21 spaced apart from each other. Both baffles 21 extend vertically and are positioned opposite the straight sections 222 of the two adjustment plates 22. Both baffles 21 are mounted on the right side wall of the square housing 3 in a manner such that they are guided and slidable. A pulley with an axis extending forward and backward is rotatably mounted on each of the front and rear sides of the right side wall of the square housing 3. Two pull wires 2 are connected to the right end of the connecting rod 1 29. The two pull wires 2 pass through the two pulleys and connect to the two baffles 21. When the rocker arm 42 rotates clockwise, it drives the connecting rod 1 29 to the left. The connecting rod 1 29, via the pull wires 2, drives the two baffles 21 upward. The pulleys and pull wires 2 are not shown in the figure.

[0063] The support assembly includes two support plates 23 arranged at intervals in front and back. The left end of the support plate 23 is rotatably mounted on the square shell 3 around a rotation axis extending forward and backward. An elastic member three 24 is connected between the right end of the support plate 23 and the square shell 3. The elastic member three 24 is a tension spring. When the elastic member three 24 is in a natural state, the right end of the support plate 23 is higher than the left end. The two support plates 23 are respectively arranged below the two adjustment plates 22. The support plate 23 is used to block the plastic tube at the bottom of the discharge chamber.

[0064] like Figure 1 As shown, the conveying mechanism includes two groups of conveying chain components arranged symmetrically in front and back.

[0065] The conveyor chain assembly includes a sprocket 7, a chain 5 and a support block 6.

[0066] Two sprockets 7 are provided at intervals on the left and right, and are both rotatably mounted on the frame 1 around a rotation axis extending forward and backward. The sprockets 7 are located in the inner cavity of the frame 1.

[0067] The chain 5 is sleeved on the outside of the two sprockets 7 , and the portion of the chain 5 located between the top ends of the two sprockets 7 is located above the top side wall of the frame 1 .

[0068] There are multiple support blocks 6 connected to the chain 5 at equal intervals. The support block 6 is provided with a V-shaped groove with an opening facing away from the chain 5. The groove side walls on the left and right sides of the groove are not at the same height. When the support block 6 rotates with the chain 5 to be located above the frame 1, the left side wall of the groove is higher than the right side wall.

[0069] The two supporting blocks 6 facing each other in the two groups of conveyor chain assemblies are used to cooperate with each other to support the front and rear ends of the same plastic pipe.

[0070] The thermoforming mechanism includes a movable frame driving mechanism, a movable frame 11, a supporting sleeve 13, a forming die, an extrusion driving mechanism, a heating rod 34 and a compacting assembly.

[0071] like Figure 11As shown, the movable frame driving mechanism includes a driving motor 8 and a transmission screw 39. The driving motor 8 is fixedly mounted on the support frame 9. The transmission screw 39 extends in the front-to-back direction and is rotatably mounted on the support frame 9. The transmission screw 39 is connected to the driving motor 8 so as to be driven by the driving motor 8 to rotate.

[0072] like Figure 2 As shown, the movable frame 11 is a box structure, which is detachably connected to the frame 1 by connecting bolts. An air inlet is provided on the top side wall of the movable frame 11, and a cooling fan 10 is provided at the air inlet. Figure 11 As shown, the movable frame 11 is installed on the support frame 9 in a guided sliding manner along the front-back direction. The bottom of the movable frame 11 is connected to an L-shaped transmission plate 40, which is spirally mounted on the outside of the transmission screw 39. When the drive motor 8 drives the transmission screw 39 to rotate, the transmission screw 39 drives the transmission plate 40 and the movable frame 11 to move along the front-back direction.

[0073] like Figure 2 、 Figure 10 、 Figure 11 、 Figure 12 As shown, the axis of the support sleeve 13 extends in the front-to-back direction, the support sleeve 13 is vertically connected to the middle of the rear side wall of the movable frame 11, the rear end of the support sleeve 13 is tapered, and the inner cavity of the support sleeve 13 is connected to the inner cavity of the movable frame 11.

[0074] The forming mold includes two forming modules 14 symmetrically arranged on the left and right sides of the support sleeve 13. Both forming modules 14 are mounted on the movable frame 11 in a lateral, guided, and sliding manner. The cross-section of the forming modules 14 is semicircular, and the inner sidewalls of the forming modules 14 are provided with half-segment threaded protrusions. The threaded protrusions on the two forming modules 14 are adapted to form a complete thread when the two forming modules 14 abut. When the two forming modules 14 abut, they form a threaded cavity with the support sleeve 13 for extruding the interface end of the plastic tube.

[0075] like Figure 10-12 As shown, the extrusion drive mechanism includes an extrusion cylinder 12 , a pressing block 35 , a moving block 15 and a connecting rod 16 .

[0076] The extrusion cylinder 12 is mounted on the front wall of the movable frame 11 . The extrusion cylinder 12 has a drive output end that can move forward and backward. The drive output end of the extrusion cylinder 12 is located in the inner cavity of the movable frame 11 .

[0077] The pressing block 35 is connected to the driving output end of the extrusion cylinder 12 and can be driven by the extrusion cylinder 12 to move forward and backward.

[0078] Two moving blocks 15 are provided, one connected to each of the two forming modules 14 and located on opposite sides of the two forming modules 14. The moving blocks 15 are mounted on the rear side wall of the movable frame 11 in a guided sliding manner in the left-right direction. The forming modules 14 are mounted on the movable frame 11 in a guided sliding manner in the left-right direction via the moving blocks 15.

[0079] Two connecting rods 16 are provided, arranged symmetrically. The front ends of the two connecting rods 16 are hinged to the pressure block 35 about a vertically extending rotation axis, while the rear ends of the two connecting rods 16 are hinged to the two movable blocks 15 about a vertically extending rotation axis. The spacing between the front ends of the two connecting rods 16 is smaller than the spacing between the rear ends of the two connecting rods 16. When the extrusion cylinder 12 drives the pressure block 35 backward, the two connecting rods 16 can synchronously move the two movable blocks 15 away from each other, thereby moving the two forming modules 14 away from each other. The connecting rods 16 are telescopic rods that can only be extended or compressed when subjected to a certain amount of tension or pressure. They can adopt structures such as gas springs or elastic telescopic rods.

[0080] The heating rod 34 extends in the front-to-back direction and is connected to the rear side of the pressing block 35 . The heating rod 34 remains coaxial with the above-mentioned support sleeve 13 . When the extrusion cylinder 12 drives the pressing block 35 to move backward, it can drive the heating rod 34 to extend into the support sleeve 13 .

[0081] like Figure 10-12 As shown, the compacting assembly includes an extrusion ring 41 , a drive ring 36 , an extrusion rocker 37 and an L-shaped connecting rod 38 .

[0082] like Figure 11 、 Figure 12 As shown, the extrusion ring 41 is coaxially sleeved on the outside of the support sleeve 13 and is located on the side of the forming mold near the movable frame 11. The drive ring 36 is located within the movable frame 11 and is coaxial with the extrusion ring 41. The drive ring 36 is connected to the extrusion ring 41 via a connecting rod that passes through the rear side wall of the movable frame 11. An elastic member 4 is connected between the drive ring 36 and the rear side wall of the movable frame 11.

[0083] Two extrusion rocker rods 37 are provided symmetrically on the left and right. Both extrusion rocker rods 37 are hinged in the movable frame 11 for sliding along the up and down directions. The top ends of the extrusion rocker rods 37 are pressed on the driving ring 36.

[0084] Two L-shaped connecting rods 38 are symmetrically arranged, and are positioned opposite the two extrusion swing arms 37 in front and back, respectively. The L-shaped connecting rods 38 comprise a horizontal rod section and a vertical rod section perpendicularly connected to the front end of the horizontal rod section. The horizontal rod section is mounted within the movable frame 11 for sliding movement along the front-to-back direction, while the vertical rod section is located in front of the pressure block 35 and blocks the pressure block 35 in the front-to-back direction. The rear end of the horizontal rod section is hinged to the bottom end of the corresponding extrusion swing arm 37. When the extrusion cylinder 12 drives the pressure block 35 to move backward, extending the connecting rod 16, the pressure block 35 can push the vertical rod section to drive the L-shaped connecting rod 38 backward, thereby causing the extrusion swing arm 37 to swing. The top end of the extrusion swing arm 37 presses the drive ring 36 backward, which drives the extrusion ring 41 backward. The extrusion ring 41 presses against the end of the plastic pipe, compacting the threaded portion of the plastic pipe.

[0085] like Figure 7 As shown, the positioning mechanism includes a lifting cylinder 20, a bracket and a clamping assembly.

[0086] The lifting cylinder 20 is fixedly mounted on the frame 1 and is located in the inner cavity of the frame 1 . The lifting cylinder 20 and the movable through hole 102 on the frame 1 are vertically opposite.

[0087] like Figure 6 、 Figure 7 As shown, the bracket includes a support plate 19 and a support 17. The support plate 19 extends horizontally and is connected to the lifting output end of the lifting cylinder 20. There are two supports 17, both of which are connected to the top of the support plate 19 and distributed at the front and rear ends of the support plate 19. Figure 7 、 Figure 9 As shown, the interior of the support 17 is hollow and the top end is open. A support portion 171 is provided at the top end of the support 17 , and a V-shaped support groove is provided on the support portion 171 .

[0088] The clamping assembly includes a clamping cylinder 33 , a vertical push block 32 and a clamping arm 18 .

[0089] like Figure 9 As shown, the clamping cylinder 33 is installed on the bottom side wall of the support 17, and the clamping cylinder 33 has a driving output end that can move up and down.

[0090] The vertical push block 32 has two oblique side walls 321 arranged symmetrically on the left and right. The vertical push block 32 is installed in the inner cavity of the support 17 in a guided sliding manner along the up and down directions. A bottom pressure roller 30 is connected to the top of the vertical push block 32.

[0091] Two sets of clamping arms 18 are provided, symmetrically arranged on the left and right sides of the vertical push block 32. The clamping arms 18 comprise two integrally connected rocker arms, each opening toward the bottom pressure roller 30. The two rocker arms form an obtuse angle between them. The connecting region of the two rocker arms is hinged to the support 17 about a rotation axis extending forward and backward, and is connected to the support 17 via a torsion spring. Each of the two rocker arms has an end pressure roller 31 connected to its opposite end.

[0092] The two end pressure rollers 31 at the bottom of the two groups of clamping arms 18 are respectively pressed against the two inclined side walls 321 of the vertical push block 32. When the clamping cylinder 33 drives the vertical push block 32 to move upward, the bottom pressure roller 30 is driven to move upward, and the two clamping arms 18 are driven to swing through the two inclined side walls 321, so that the top ends of the two clamping arms 18 are close to each other, so that the bottom pressure roller 30 and the end pressure rollers 31 at the top ends of the two clamping arms 18 clamp the plastic tube.

[0093] When the present invention is in use, the plastic tubes to be processed are first placed in the storage chamber. The plastic tubes move along the inclined plate section 1 401, the inclined plate section 2 402 and the inclined plate section 3 221 toward the discharge chamber and accumulate in the discharge chamber. The plastic tubes at the bottom are supported by two support plates 23.

[0094] Then the conveying mechanism is started, and the chain 5 begins to rotate clockwise. When the support block 6 on the chain 5 moves to the plastic pipe supported by the support plate 23, the left groove wall of the groove in the support block 6 pushes the plastic pipe to the right, and the plastic pipe pushes the support plate 23 to swing downward. The distance between the support plate 23 and the baffle 21 increases, so that the plastic pipe can leave the discharge cavity and fall into the groove on the support block 6. Then the plastic pipe is driven by the support block 6 to continue to move to the right.

[0095] When the plastic tube moves to the movable perforation 102, the lifting cylinder 20 drives the bracket to move upward, and the plastic tube falls into the support groove on the support part 171 at the top of the support 17, and is lifted upward by the support part 171 and separated from the support block 6. Then the clamping cylinder 33 drives the vertical push block 32 to move upward, driving the bottom pressure roller 30 to move upward, and the two end pressure rollers 31 at the top approach each other to clamp the plastic tube supported by the support part 171. The clamped plastic tube remains coaxial with the support sleeve 13.

[0096] The drive motor 8 is then started, driving the movable frame 11 to move backward. The support sleeve 13 is inserted from front to back into the interface end of the plastic tube to support the plastic tube. At this time, the two forming modules 14 remain separated from each other. The heating rod 34 is located inside the support sleeve 13 and heats the interface end of the plastic tube to soften the plastic tube. After the plastic tube softens, the extrusion cylinder 12 is started, driving the pressing block 35 forward. The pressing block 35 drives the two moving blocks 15 closer together via the connecting rod 16. The two forming modules 14 approach each other and press against the interface end of the plastic tube, extruding an external thread on the plastic tube. At the same time, the pressing block 35 drives the heating rod 34 forward and away from the inner cavity of the support sleeve 13.

[0097] After the two forming modules 14 abut against each other, the extrusion cylinder 12 can pull the connecting rod 16 to extend, thereby driving the pressing block 35 to continue to move forward. When the pressing block 35 continues to move forward, it drives the L-shaped connecting rod 38 to move forward. The L-shaped connecting rod 38 drives the extrusion rocker 37 to swing, so that the top end of the extrusion rocker 37 is pressed tightly against the drive ring 36. The drive ring 36 drives the extrusion ring 41 to move backward, pressing the threaded section of the plastic pipe more densely.

[0098] Then, the extrusion cylinder 12 is controlled to drive the pressing block 35 to move backward. The pressing block 35 drives the two forming modules 14 to move away from each other through the connecting rod 16, loosening the plastic tube after thread forming. Then, the driving motor 8 is started to control the movable frame 11 to move forward, so that the supporting sleeve 13 is separated from the plastic tube.

[0099] The clamping cylinder 33 drives the vertical push block 32 to move downward, loosening the plastic tube, and the loosened plastic tube falls into the support groove. Then the lifting cylinder 20 drives the bracket to move downward, driving the plastic tube to fall into the groove on the support block 6 again. The lifting cylinder 20 drives the bracket and the clamping assembly to move into the inner cavity of the frame 1. The support block 6 supports the processed plastic tube and continues to move to the right, and transports the processed plastic tube to the connecting port 101 located on the right side of the frame 1. The processed plastic tube falls into the collection box 2 at the bottom of the frame 1 from the connecting port 101.

[0100] When external threading of plastic tubes of different diameters is required, the locking bolt 43 can be pulled out of the locking hole 301, and the rocker arm 42 can be rotated to adjust the width of the discharge cavity to match the diameter of the new plastic tube. At the same time, the baffle 21 is moved so that the height of the bottom end of the baffle 21 matches the diameter of the new plastic tube, making it easier to pull the new plastic tube out of the discharge cavity. At the same time, the thermoforming mechanism is removed from the frame 1 by tightening the connecting bolts, and the thermoforming mechanism is replaced so that the size of the supporting sleeve 13 and the forming mold in the replaced thermoforming mechanism matches the size of the new plastic tube, so that the forming device can process plastic tubes of different sizes.

[0101] The present invention provides a support sleeve 13 to support the plastic pipe, and the connection between the heating link and the extrusion molding link of the plastic pipe is more coherent, which can improve production efficiency and avoid significant deformation of the plastic pipe after heating and softening. The thread molding quality of the present invention is better and the quality is better.

Claims

1. A device for forming external threads of a plastic pipe interface, comprising a frame, a storage mechanism for storing plastic pipes and a conveying mechanism for conveying the plastic pipes from left to right, characterized in that: The frame is also provided with a thermoforming mechanism and a positioning mechanism. The thermoforming mechanism includes a movable frame and a movable frame driving mechanism, and also includes: A support sleeve, the axis of which extends in the front-to-back direction, is fixedly connected to the movable frame and is used to be inserted into the plastic pipe to support the plastic pipe; a heating rod, coaxial with the supporting sleeve, and configured to be inserted into the supporting sleeve to heat the plastic pipe; The forming mold includes two forming modules with semicircular cross-sections, symmetrically arranged on the left and right sides of the support sleeve. The two forming modules are slidably mounted on a movable frame. The inner side walls of the two forming modules are each provided with a half-segment threaded protrusion. The two forming modules can synchronously move toward or away from each other in the left and right directions. When the two forming modules abut against each other, they can cooperate with the support sleeve to enclose a threaded cavity for extruding the interface end of the plastic tube. The positioning mechanism is used to clamp the plastic tube delivered to the thermoforming mechanism and move the plastic tube so that the plastic tube and the supporting sleeve remain coaxial; The movable frame can be driven by the movable frame driving mechanism to move in the front-back direction toward the plastic pipe clamped by the positioning mechanism, so that the supporting sleeve is inserted into the plastic pipe; An extrusion drive mechanism is provided on the movable frame, and the extrusion drive mechanism includes an extrusion cylinder, a pressure block, a moving block and two connecting rods. The extrusion cylinder has a driving output end that can move back and forth. The driving output end of the extrusion cylinder is located in the inner cavity of the movable frame. The pressure block is connected to the driving output end of the extrusion cylinder and is located between the extrusion cylinder and the forming mold. There are two moving blocks, which are respectively connected to the two forming modules and are located on the side away from each other of the two forming modules. The two moving blocks are both guided and slidably installed on the movable frame along the left and right directions. The two connecting rods are symmetrically arranged on the left and right sides of the supporting sleeve. One end of the connecting rod is hinged on the pressure block around a vertically extending rotation axis, and the other end is hinged on the movable block on the corresponding side around a vertically extending rotation axis. The spacing between the hinge points of the two connecting rods on the pressure block is smaller than the spacing between the hinge points of the two connecting rods on the two movable blocks. An extrusion ring that can move back and forth is provided on the movable frame. The extrusion ring is sleeved on the supporting sleeve. The extrusion ring is located on a side of the forming mold close to the movable frame and is directly opposite to the threaded cavity from front to back. The connecting rod is a telescopic rod. The pressure block is connected to the extrusion ring in a transmission manner. The extrusion ring can be driven by the pressure block moving away from the forming mold to move toward the threaded cavity. The heating rod is connected to the pressing block. When the extrusion cylinder drives the pressing block to move toward the forming die, it can drive the heating rod to insert into the supporting sleeve; The conveying mechanism includes two sets of conveying chain components arranged symmetrically in front and back. The conveying chain components include chains and support blocks connected to the chains. The support blocks are provided with grooves with openings facing away from the chains for placing plastic pipes.

2. A plastic pipe interface external thread forming device according to claim 1, characterized in that: The connecting rod can be driven by the extrusion cylinder to be lengthened after the two forming modules abut against each other, so that the pressing block can be driven by the extrusion cylinder to continue to move back to the forming mold after the two forming modules abut against each other.

3. A plastic pipe interface external thread forming device according to claim 2, characterized in that: The movable frame is a box structure, the support sleeve is connected to the outer wall of the movable frame and communicates with the inner cavity of the movable frame, an air inlet is provided on the side wall of the movable frame, a cooling fan is installed at the air inlet, and the cooling fan can blow air toward the inner cavity of the movable frame through the air inlet.

4. A plastic pipe interface external thread forming device according to claim 3, characterized in that: The storage mechanism includes a storage box, which is provided with a storage cavity. The bottom of the storage cavity is connected to a vertically extending discharge cavity for storing multiple plastic tubes stacked up and down. The width of the discharge cavity is adapted to the outer diameter of the plastic tube to be processed. The bottom of the discharge cavity is provided with a support plate for supporting the bottom of the plastic tube in the discharge cavity. The left end of the support plate is elastically hinged to the frame around a rotation axis extending forward and backward. The right end of the support plate is higher than the left end. The left groove wall of the groove in the support block located on the upper half of the chain is higher than the right groove wall. When the support block moves to the right, the left groove wall of the groove can push the support plate downward by pushing the bottom plastic tube to the right, thereby pulling the plastic tube out from the bottom of the discharge cavity and falling into the groove.

5. A plastic pipe interface external thread forming device according to claim 4, characterized in that: The width of the discharge cavity can be adjusted to accommodate plastic tubes of different outer diameters. The thermoforming mechanism is provided with multiple groups according to the different outer diameters of plastic tubes. The thermoforming mechanism can be detachably mounted on the frame.

6. A plastic pipe interface external thread forming device according to claim 1 or 2, characterized in that: The positioning mechanism includes a lifting drive and a clamping assembly connected to the lifting output end of the lifting drive, the clamping assembly includes a bottom clamping roller and two end clamping rollers arranged symmetrically above the bottom clamping roller, the bottom clamping roller is used to support the bottom of the plastic pipe, the bottom clamping roller can move upward, and the two end clamping rollers can synchronously approach each other when the bottom clamping roller moves upward to clamp the plastic pipe between the bottom clamping roller and the two end clamping rollers.

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