Plastic protection tube injection molding device

Abstract

The present invention relates to the technical field of injection molding devices, and in particular to a plastic protection tube injection molding device, comprising a frame, an injection mold and an injection molding tube. The injection molding tube comprises a shell, a conveying shaft, a pushing shaft and an extrusion head. A partition is arranged in the shell, and the partition can divide the shell into a conveying chamber and an extrusion chamber arranged in sequence along a first direction. Both the conveying shaft and the pushing shaft are spiral structures and are both located in the conveying chamber, and the extrusion head is located in the extrusion chamber. A plastic protection tube injection molding device of the present invention arranges a conveying shaft, a pushing shaft and an extrusion head in the shell. When the plastic is conveyed to the pushing shaft, since the rotation speed of the pushing shaft is greater than the rotation speed of the conveying shaft, the molten plastic in the pushing shaft will be subjected to a greater centrifugal force, so that the bubbles can be discharged from the pores on the pushing shaft to the outside, thereby improving the quality of the injection molded product.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding devices, in particular to an injection molding device for a plastic protection tube. Background Art

[0002] Injection molding of plastic protective tubes is a commonly used processing technology. Its basic principle is to inject molten plastic into the mold under the action of the injection molding machine, and form the required plastic tube after cooling. Injection molding must go through the pre-plasticization stage, filling stage, pressure holding stage, cooling stage and demolding stage. Among them, the pre-plasticization stage refers to the heating, conveying, compacting, shearing, mixing and homogenization of the plastic material in the barrel to transform the material into a viscous flow state, thereby meeting the injection molding requirements. When the existing plastic protective tube injection molding device heats and melts the plastic, bubbles will exist in the molten plastic. The presence of bubbles will have a negative impact on the appearance, internal structure and other aspects of the product, causing the quality of the product to decline, and even affecting the normal use of the product. Summary of the invention

[0003] The present invention provides a plastic protection tube injection molding device to solve the problem that bubbles will exist in the molten plastic when the existing plastic protection tube injection molding device heats and melts the plastic, and the existence of bubbles will have a negative impact on the appearance, internal structure and other aspects of the product, causing the quality of the product to decline and even affecting the normal use of the product.

[0004] A plastic protective tube injection molding device of the present invention adopts the following technical scheme: a plastic protective tube injection molding device, comprising a frame, an injection mold and an injection molding tube; the injection mold and the injection molding tube are arranged in sequence on the frame along a first direction, and the first direction is a horizontal direction; the injection molding tube comprises a shell, a conveying shaft, a pushing shaft and an extrusion head; a heating element is arranged on the shell, which can heat and melt the plastic; a partition is arranged in the shell, and the partition can divide the shell into a conveying chamber and an extrusion chamber arranged in sequence along the first direction, a feed port is opened on the conveying chamber, and a discharge port is opened on the extrusion chamber; both the conveying shaft and the pushing shaft are spiral structures and are both located in the conveying chamber, and the pushing shaft is located on the side of the conveying shaft away from the feed port in the first direction; both the conveying shaft and the pushing shaft can be arranged to rotate around the first direction, and the rotation speed of the pushing shaft is greater than the rotation speed of the conveying shaft; a plurality of air holes are opened on the pushing shaft, and the air holes are connected to the outside; the extrusion head is located in the extrusion chamber, and is located on the side of the pushing shaft away from the conveying shaft in the first direction. The injection molding tube has a first state and a second state. When in the first state, the conveying chamber and the extrusion chamber are separated from each other, and when in the second state, the conveying chamber and the extrusion chamber are connected to each other; in the initial state, the injection molding tube is in the first state, and when the injection molding tube is in the second state, the molten plastic can be conveyed from the extrusion chamber to the injection mold through the discharge port; the conveying shaft, the pushing shaft and the extrusion head can all move in the first direction, and the movement of the conveying shaft, the pushing shaft and the extrusion head in the first direction can switch the injection molding tube from the first state to the second state.

[0005] Furthermore, a first driving member is provided on the frame, and the first driving member is used to drive the conveying shaft to rotate around a first direction. A gear ring is fixedly provided on the conveying shaft, and the gear ring is coaxially arranged with the conveying shaft. A partition is provided on the conveying shaft, and a planetary gear is rotatably arranged on the partition; the conveying shaft can rotate around the first direction relative to the partition, and move synchronously with the partition along the first direction; a gear is provided on the driving shaft, and the planetary gear is meshed with the gear ring and the gear at the same time.

[0006] Furthermore, a plurality of limit protrusions are evenly distributed in the circumferential direction of the partition, and the plurality of limit protrusions are all installed on the inner wall of the shell, so that the partition can only move along the first direction and limit the rotation of the partition around the first direction; a second driving member is arranged on the frame, and the second driving member is used to drive the conveying shaft to move along the first direction.

[0007] Furthermore, a transmission shaft is fixedly connected to the conveying shaft, the transmission shaft is arranged along the first direction and is located on the side of the conveying shaft in the first direction away from the driving shaft; a transmission wheel is arranged on the transmission shaft, the first driving member can drive the transmission wheel to rotate around the first direction, and the transmission shaft can rotate around the first direction with the transmission wheel and move along the first direction relative to the transmission wheel; a transmission cylinder is fixedly arranged at the output end of the second driving member, the transmission shaft is installed on the transmission cylinder, and the transmission shaft can move along the first direction with the transmission cylinder and rotate around the first direction relative to the transmission cylinder.

[0008] Furthermore, the conveying shaft includes a first shaft body and a first spiral piece, the first spiral piece is installed on the first shaft body, the pushing shaft includes a second shaft body and a second spiral piece, the second spiral piece is installed on the second shaft body, the second shaft body is hollow inside, the rotation direction of the first spiral piece and the rotation direction of the second spiral piece are the same, a plurality of air holes are opened on the second shaft body, an air passage connected to the outside is opened on the first shaft body, and the air passage is connected to the air hole through the second shaft body.

[0009] Furthermore, the two ends of the second spiral piece along the first direction are respectively called the first end and the second end, the first end is located on a side of the second end close to the first shaft body in the first direction, the first end is slidably connected to the second shaft body, and the second end is fixed to the second shaft body, a third driving member is arranged in the second shaft body, and a moving block is arranged at the output end of the third driving member, the third driving member can cause the moving block to move in the first direction, and a movable groove and a retaining groove are provided on the second shaft body. The movable groove and the retaining groove are both arranged along the first direction, the movable groove is located on the side of the retaining groove close to the central axis of the shell in the second direction, the shell is a cylindrical structure arranged along the first direction, the second direction is perpendicular to the first direction, and the second direction is the radial direction of the shell; a movable plate is slidably arranged in the movable groove, and the size of the movable plate in the first direction is larger than the size of the retaining groove in the first direction, and the movable block is fixedly connected to the first end of the second spiral piece after passing through the movable plate and the retaining groove in sequence in the second direction.

[0010] Furthermore, a pressure sensor is arranged in the shell and is located on one side of the driving shaft; the partition is a partition block and is arranged in the circumferential direction of the extrusion head; a connecting groove is provided on the inner wall of the shell; in the initial state, the partition block is located on the side of the connecting groove close to the driving shaft in the first direction and is slidably sealed with the inner wall of the shell; and when the partition block moves into the connecting groove along the first direction, the transmission chamber can be connected with the extrusion chamber.

[0011] Further, the connecting groove is located on a side of the shell close to the frame in a third direction, the third direction is perpendicular to the first direction and the second direction respectively, and the third direction is a vertical direction.

[0012] Furthermore, a plurality of limit grooves are provided on the inner wall of the shell, and the plurality of limit grooves are all arranged along the first direction. The plurality of limit grooves are arranged one-to-one correspondingly to the plurality of limit protrusions, and each limit protrusion is slidably installed in the corresponding limit groove, so that the conveying shaft can rotate around the first direction relative to the partition and move synchronously with the partition along the first direction.

[0013] Further, a dimension of the conveying shaft in the first direction is greater than a dimension of the pushing shaft in the first direction.

[0014] The beneficial effects of the present invention are as follows: a plastic protective tube injection molding device of the present invention arranges a conveying shaft, a driving shaft and an extrusion head in a shell. When in use, the plastic is poured into the shell from the feed port, and the conveying shaft and the driving shaft are driven to rotate around a first direction. During the rotation, the plastic will gradually be heated and melted. After the plastic is conveyed to the driving shaft, since the rotation speed of the driving shaft is greater than the rotation speed of the conveying shaft, the molten plastic in the driving shaft will be subjected to a greater centrifugal force, thereby making the molten plastic between the driving shaft and the inner wall of the shell closer to the inner wall of the shell, and squeezing out the bubbles in the molten plastic so that the bubbles can be discharged to the outside from the pores on the driving shaft. The bubbles in the molten plastic are processed to avoid negative impact on the quality of the product after injection molding when the bubbles are in the molten plastic, thereby improving the quality of the injection molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the overall structure of an embodiment of a plastic protection tube injection molding device of the present invention;

[0017] Figure 2 A schematic diagram of an injection molding tube, a first driving member, and a second driving member of an embodiment of a plastic protection tube injection molding device of the present invention;

[0018] Figure 3 A schematic diagram of an injection molding tube of an embodiment of a plastic protection tube injection molding device of the present invention;

[0019] Figure 4 for Figure 3 Sectional view along AA;

[0020] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0021] Figure 6 for Figure 3 Sectional view along the middle line BB;

[0022] Figure 7 This is a disassembled view of an injection molding tube of an embodiment of a plastic protection tube injection molding device of the present invention;

[0023] Figure 8 for Figure 7 The enlarged view of point D in the middle;

[0024] Fig. 9 A schematic diagram of a housing of an embodiment of a plastic protection tube injection molding device of the present invention;

[0025] Fig.10 for Fig. 9 Enlarged view of point E in the middle.

[0026] In the figure: 100, frame; 110, first driving member; 111, driving wheel; 120, second driving member; 121, transmission cylinder; 200, injection mold; 300, injection tube; 310, shell; 311, connecting groove; 312, pressure sensor; 320, conveying shaft; 321, gear ring; 322, planetary gear; 323, partition; 324, limiting protrusion; 325, airway; 330, driving shaft; 331, gear; 332, third driving member; 333, moving block; 334, movable groove; 335, retaining groove; 336, movable plate; 337, air hole; 340, extrusion head; 350, conveying chamber; 351, feed port; 360, extrusion chamber; 361, discharge port; 370, transmission shaft; 371, transmission wheel; 380, partition block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] An embodiment of a plastic protection tube injection molding device of the present invention is as follows Figures 1 to 10 shown.

[0029] A plastic protection tube injection molding device comprises a frame 100, an injection mold 200 and an injection molding tube 300. The injection mold 200 and the injection molding tube 300 are arranged in sequence on the frame 100 along a first direction, and the first direction is a horizontal direction. The injection molding tube 300 comprises a shell 310, a conveying shaft 320, a driving shaft 330 and an extrusion head 340. A heating element is arranged on the shell 310, which can heat and melt the plastic. A partition is arranged in the shell 310, and the partition can divide the shell 310 into a conveying chamber 350 and an extrusion chamber 360 arranged in sequence along the first direction. A feed port 351 is provided on the conveying chamber 350, and a discharge port 361 is provided on the extrusion chamber 360. Both the conveying shaft 320 and the driving shaft 330 are spiral structures and are both located in the conveying chamber 350, and the driving shaft 330 is located on the side of the conveying shaft 320 away from the feed port 351 in the first direction. The dimension of the conveying shaft 320 in the first direction is greater than the dimension of the driving shaft 330 in the first direction. Both the conveying shaft 320 and the driving shaft 330 are rotatable around the first direction, and the rotation speed of the driving shaft 330 is greater than the rotation speed of the conveying shaft 320. The driving shaft 330 is provided with a plurality of air holes 337, which are connected to the outside.

[0030] The extrusion head 340 is located in the extrusion chamber 360 and is located on the side of the driving shaft 330 away from the conveying shaft 320 in the first direction. The injection tube 300 has a first state and a second state. When in the first state, the conveying chamber 350 and the extrusion chamber 360 are separated from each other, and when in the second state, the conveying chamber 350 and the extrusion chamber 360 are connected to each other. In the initial state, the injection tube 300 is in the first state, and when the injection tube 300 is in the second state, the molten plastic can be conveyed from the extrusion chamber 360 to the injection mold 200 through the discharge port 361. The conveying shaft 320, the driving shaft 330 and the extrusion head 340 can all move in the first direction, and the movement of the conveying shaft 320, the driving shaft 330 and the extrusion head 340 in the first direction can switch the injection tube 300 from the first state to the second state.

[0031] Specifically, the injection mold 200 includes a fixed mold and a movable mold, the fixed mold is fixedly mounted on the frame 100, and the movable mold can slide along a first direction toward one side of the fixed mold to be molded with the fixed mold. A driving motor is provided on the frame 100, and the driving motor is used to drive the movable mold to move along the first direction toward a side close to the fixed mold, so that the fixed mold and the movable mold are molded together to complete the injection molding. The injection mold 200 is a prior art and will not be described in detail here.

[0032] In this embodiment, a conveying shaft 320, a driving shaft 330 and an extrusion head 340 are arranged in the shell 310. When in use, plastic is poured into the shell 310 from the feed port 351, and the conveying shaft 320 and the driving shaft 330 are driven to rotate around a first direction. During the rotation, the plastic will gradually be heated and melted. After the plastic is conveyed to the driving shaft 330, since the rotation speed of the driving shaft 330 is greater than the rotation speed of the conveying shaft 320, the molten plastic in the driving shaft 330 will be subjected to a greater centrifugal force, thereby making the molten plastic between the driving shaft 330 and the inner wall of the shell 310 more closely attached to the inner wall of the shell 310, and squeezing out the bubbles in the molten plastic so that the bubbles can be discharged to the outside from the air holes 337 on the driving shaft 330, and processing the bubbles in the molten plastic to avoid negative impact on the quality of the product after injection molding when the bubbles are in the molten plastic, thereby improving the quality of the injection molded product. After the bubbles are discharged, the conveying shaft 320, the driving shaft 330 and the extrusion head 340 are moved along the first direction, the injection tube 300 is switched from the first state to the second state, and the molten plastic is conveyed into the injection mold 200 to complete the injection molding.

[0033] In this embodiment, the frame 100 is provided with a first driving member 110, and the first driving member 110 is used to drive the conveying shaft 320 to rotate around the first direction, and the first driving member 110 is a motor. A ring gear 321 is fixedly provided on the conveying shaft 320, and the ring gear 321 is coaxially arranged with the conveying shaft 320. A partition 323 is provided on the conveying shaft 320, and a planetary gear 322 is rotatably provided on the partition 323. The conveying shaft 320 can rotate around the first direction relative to the partition 323, and move synchronously with the partition 323 along the first direction. A gear 331 is provided on the driving shaft 330, and the planetary gear 322 is meshed with the ring gear 321 and the gear 331 at the same time.

[0034] Specifically, a mounting cavity is provided on the conveying shaft 320, and the gear ring 321 is fixedly arranged in the mounting cavity. A first protrusion is provided on the conveying shaft 320, and the first protrusion is annular and arranged in the circumferential direction of the conveying shaft 320. A first annular groove is provided on the partition plate 323, and the first protrusion is rotatably matched with the first annular groove, so that the conveying shaft 320 can rotate relative to the partition plate 323 around the first direction and move synchronously with the partition plate 323 along the first direction.

[0035] Furthermore, the conveying shaft 320 includes a first shaft body and a first spiral piece, the first spiral piece is fixedly installed on the first shaft body, the driving shaft 330 includes a second shaft body and a second spiral piece, the second spiral piece is installed on the second shaft body, the second shaft body is hollow inside, the rotation direction of the first spiral piece and the rotation direction of the second spiral piece are the same, a plurality of air holes 337 are all opened on the second shaft body, an air channel 325 connected to the outside is opened on the first shaft body, and the air channel 325 is connected to the air hole 337 through the second shaft body, the air hole 337 only allows gas to enter the second shaft body and restricts the molten plastic from entering the second shaft body.

[0036] Specifically, when in use, the size of the pores 337 can be limited according to the material and viscosity of the molten plastic, so that the pores 337 only allow gas to enter the second shaft body, and limit the molten plastic from entering the second shaft body, so as to ensure that the gas is discharged smoothly without overflowing. Alternatively, a barrier film is provided on each pore 337, and the barrier film is an e-PTFE film, i.e., an expanded polytetrafluoroethylene film, which is a microporous film made of polytetrafluoroethylene (PTFE) through a special process. The barrier film has a porous and flexible structure, and its mesh microporous structure allows gas to pass through, but does not allow liquid or solid particles to pass through, so that the pores 337 only allow gas to enter the second shaft body, and limit the molten plastic from entering the second shaft body.

[0037] In this embodiment, a planetary gear system is formed by setting a ring gear 321, a gear 331 and a planetary gear 322. When in use, the conveying shaft 320 is driven to rotate by the first driving member 110. The rotation of the conveying shaft 320 will drive the ring gear 321 to rotate, and the ring gear 321 will drive the gear 331 to rotate through the planetary gear 322, so that the gear 331 can drive the driving shaft 330 to rotate around the first direction, and the rotation speed of the driving shaft 330 is greater than the rotation speed of the conveying shaft 320.

[0038] By setting the interior of the second shaft body as a hollow structure, when in use, bubbles can be discharged to the outside from the air channel 325 connected to the second shaft body after entering the interior of the second shaft body. The rotation direction of the driving shaft 330 is opposite to that of the conveying shaft 320. By making the rotation direction of the first spiral sheet and the second spiral sheet the same, and the diameter of the conveying shaft 320 is larger than the diameter of the driving shaft 330, the distance between the conveying shaft 320 and the inner wall of the shell 310 is smaller than the distance between the driving shaft 330 and the inner wall of the shell 310, so that the material in the conveying shaft 320 has space to move to one side of the driving shaft 330, and the material in the driving shaft 330 is not easy to move to one side of the conveying shaft 320, so as to achieve the overall movement trend of the molten plastic from the conveying shaft 320 to the driving shaft 330. When two or more plastics need to be melted, the rotation directions of the conveying shaft 320 and the driving shaft 330 are opposite. This setting can improve the uniformity of the mixing of the molten plastics between the conveying shaft 320 and the driving shaft 330.

[0039] Or, the first spiral sheet and the second spiral sheet have opposite rotation directions. By setting the rotation directions of the first spiral sheet and the second spiral sheet, the conveying direction of the conveying shaft 320 and the driving shaft 330 can be changed so that the two convey the molten plastic to the same direction all the time.

[0040] In this embodiment, a plurality of limiting protrusions 324 are evenly distributed in the circumferential direction of the partition 323, and the plurality of limiting protrusions 324 are all installed on the inner wall of the housing 310, so that the partition 323 can only move along the first direction and limit the partition 323 from rotating around the first direction. A second driving member 120 is provided on the frame 100, and the second driving member 120 is used to drive the conveying shaft 320 to move along the first direction.

[0041] Specifically, a transmission shaft 370 is fixedly connected to the conveying shaft 320, and the transmission shaft 370 is arranged along the first direction and is located on the side of the conveying shaft 320 away from the driving shaft 330 in the first direction. A driving wheel 111 is fixedly arranged at the output end of the first driving member 110, and a transmission wheel 371 is arranged on the transmission shaft 370. The transmission wheel 371 is connected to the driving wheel 111 through a transmission belt, so that the first driving member 110 can drive the transmission wheel 371 to rotate around the first direction, and the transmission shaft 370 can rotate around the first direction with the transmission wheel 371 and move relative to the transmission wheel 371 in the first direction. A transmission cylinder 121 is fixedly arranged at the output end of the second driving member 120, and the transmission shaft 370 is installed on the transmission cylinder 121, so that the transmission shaft 370 can move along the first direction with the transmission cylinder 121 and rotate relative to the transmission cylinder 121 in the first direction. The second driving member 120 is a hydraulic telescopic cylinder.

[0042] More specifically, a plurality of splines are evenly distributed in the circumferential direction of the transmission shaft 370, and the plurality of splines are arranged in the first direction. A keyway for cooperating with the splines is provided on the transmission wheel 371, so that the transmission shaft 370 can rotate along the first direction with the transmission wheel 371 and move along the first direction relative to the transmission wheel 371. A second annular groove is provided on the inner wall of the transmission cylinder 121, and a second protrusion is provided on the transmission shaft 370. The second protrusion is annular and arranged in the circumferential direction of the transmission shaft 370. The second protrusion is rotatably matched with the second annular groove, so that the transmission shaft 370 can move along the first direction with the transmission cylinder 121 and rotate along the first direction relative to the transmission cylinder 121.

[0043] In this embodiment, by arranging the transmission shaft 370, the first driving member 110 and the second driving member 120 to cooperate, the first driving member 110 can be used to drive the conveying shaft 320 to rotate around the first direction, and the second driving member 120 can be used to drive the conveying shaft 320 to move along the first direction. In addition, the transmission wheel 371 cooperates with the keyway of the transmission shaft 370, and the second protrusion rotates with the second annular groove, so that the rotation and movement of the conveying shaft 320 are not interfered.

[0044] In this embodiment, the two ends of the second spiral sheet along the first direction are respectively referred to as the first end and the second end. The first end is located on the side of the second end close to the first shaft in the first direction. The first end is slidably connected to the second shaft, and the second end is fixed to the second shaft. A third driving member 332 is arranged in the second shaft, and a moving block 333 is arranged at the output end of the third driving member 332. The third driving member 332 can cause the moving block 333 to move in the first direction. The third driving member 332 is a hydraulic telescopic cylinder. A movable groove 334 and a retaining groove 335 are provided on the second shaft. Both the movable groove 334 and the retaining groove 335 are arranged along the first direction. The movable groove 334 is located on the side of the retaining groove 335 close to the central axis of the shell 310 in the second direction. The shell 310 is a columnar structure. The second direction is perpendicular to the first direction, and the second direction is the radial direction of the shell 310. A movable plate 336 is slidably arranged in the movable groove 334, and the size of the movable plate 336 in the first direction is larger than the size of the retaining groove 335 in the first direction. The moving block 333 passes through the movable plate 336 and the retaining groove 335 in sequence in the second direction and is fixedly connected to the first end of the second spiral sheet.

[0045] In this embodiment, the third driving member 332 is arranged in the second shaft body, and the pitch of the second spiral piece can be adjusted by the third driving member 332 during use. When the heating time of the material in the housing 310 needs to be increased, the third driving member 332 can be used to drive the moving block 333 to move. The movement of the moving block 333 will drive the movable plate 336 to move in the movable groove 334, and drive the first end of the second spiral piece to move, increase the pitch of the second spiral piece, reduce the conveying speed of the driving shaft 330, and ensure that the plastic can be completely melted. By setting the retaining groove 335, when the movable plate 336 slides in the movable groove 334 along the first direction, the size of the retaining groove 335 in the first direction is the distance that the second spiral piece can move along the first direction, and the movable plate 336 can block the retaining groove 335, thereby ensuring the sealing of the second shaft body.

[0046] In this embodiment, a pressure sensor 312 is provided in the housing 310, and the pressure sensor 312 is located on one side of the driving shaft 330. The pressure sensor 312 is electrically connected to the second driving member 120. The partition is a partition block 380, which is arranged in the circumferential direction of the extrusion head 340 and is an integrally formed structure with the extrusion head 340. A connecting groove 311 is provided on the inner wall of the housing 310. In the initial state, the partition block 380 is located on the side of the connecting groove 311 close to the driving shaft 330 in the first direction, and is slidably sealed with the inner wall of the housing 310, and the size of the connecting groove 311 in the second direction is larger than the size of the partition block 380 in the second direction. When the partition block 380 moves into the connecting groove 311 along the first direction, the transmission chamber 350 can be connected with the extrusion chamber 360.

[0047] Further, the communication groove 311 is located at a side of the housing 310 close to the frame 100 in a third direction, and the third direction is perpendicular to the first direction and the second direction respectively, and the third direction is a vertical direction.

[0048] Specifically, a plurality of limiting grooves are provided on the inner wall of the housing 310, and the plurality of limiting grooves are arranged along the first direction. The plurality of limiting grooves are arranged one by one with the plurality of limiting protrusions 324, and each limiting protrusion 324 is slidably installed in the corresponding limiting groove, so that the conveying shaft 320 can rotate around the first direction relative to the partition 323, and move synchronously with the partition 323 along the first direction. In the initial state, the partition block 380 is slidably installed in one of the limiting grooves, and the limiting groove is connected with the connecting groove 311 in the first direction, so that the partition block 380 can only move in the limiting groove along the first direction, and the partition block 380 is limited to rotate around the first direction.

[0049] An annular rotating block is provided at one end of the driving shaft 330 close to the extrusion head 340 in the first direction. A rotating groove is opened on the extrusion head 340. The annular rotating block rotates in cooperation with the rotating groove, so that the driving shaft 330 can rotate around the first direction relative to the extrusion head 340 and move synchronously with the extrusion head 340 along the first direction.

[0050] Furthermore, a plurality of partition blocks 380 are provided, and the plurality of partition blocks 380 are provided in one-to-one correspondence with the plurality of limiting grooves, and each partition block 380 is slidably installed in the corresponding limiting groove.

[0051] A plastic protection tube injection molding device also includes a control system, which is electrically connected to the first driving member 110, the second driving member 120, the pressure sensor 312, and the third driving member 332. The control system is used to control the first driving member 110, the second driving member 120, the pressure sensor 312, and the third driving member 332 to start or shut down. The pressure sensor 312 can feed back the sensed signal to the control system, and drive the second driving member 120 to start through the control system.

[0052] In this embodiment, the connecting groove 311 is provided. When the pressure of the molten plastic at the position of the driving shaft 330 reaches a preset value, the pressure sensor 312 feeds back the sensed signal to the control system, and drives the second driving member 120 to start through the control system, thereby causing the conveying shaft 320, the driving shaft 330 and the extrusion head 340 to move along the first direction until the partition block 380 moves into the connecting groove 311, connecting the conveying chamber 350 and the extrusion chamber 360, so that the molten plastic can enter the extrusion chamber 360 from the conveying chamber 350. The inner side is close to the frame 100 in the third direction. Therefore, when the molten plastic enters the extrusion chamber 360, the molten plastic will continue to increase from the side close to the connecting groove 311 along the third direction, that is, from bottom to top, so that the molten plastic can smoothly enter the extrusion chamber 360 to avoid gas from being re-integrated into the molten plastic. When the extrusion chamber 360 is full of molten plastic, the second driving member 120 is driven again to move the conveying shaft 320, the pushing shaft 330 and the extrusion head 340 along the first direction, and the molten plastic is discharged from the discharge port 361 to the injection mold 200 by extrusion of the extrusion head 340.

[0053] In combination with the above embodiments, the specific working process is as follows:

[0054] When in use, first pour the plastic into the housing 310 from the side of the feed port 351. When the size of the plastic is relatively uniform, start the third driving member 332 to adjust the pitch of the second spiral sheet, and then adjust the speed of the driving shaft 330 when rotating. Then start the heating element and the first driving member 110 to drive the conveying shaft 320 and the driving shaft 330 to rotate around the first direction. During the rotation process, the plastic will gradually be heated and melted, and gradually move to the side of the driving shaft 330. At the same time, the rotation of the conveying shaft 320 will drive the ring gear 321 to rotate, and the ring gear 321 will drive the gear 331 to rotate through the planetary gear 322, so that the gear 331 can drive the driving shaft 330 to rotate around the first direction, and the rotation speed of the driving shaft 330 is greater than the rotation speed of the conveying shaft 320. When it is necessary to increase the heating time of the material in the shell 310, the third driving member 332 can be used to drive the moving block 333 to move. The movement of the moving block 333 will drive the movable plate 336 to move in the movable groove 334, and drive the second spiral piece to move, thereby increasing the pitch of the second spiral piece and reducing the conveying speed of the driving shaft 330, ensuring that the plastic can be completely melted and will not be over-melted to cause plastic deformation.

[0055] When the plastic is conveyed to the driving shaft 330, since the driving shaft 330 rotates at a speed greater than the conveying shaft 320, the molten plastic in the driving shaft 330 will be subjected to a greater centrifugal force, thereby making the molten plastic between the driving shaft 330 and the inner wall of the shell 310 more closely attached to the inner wall of the shell 310 and squeezing out the bubbles in the molten plastic. After entering the second shaft body, the bubbles will be able to be discharged to the outside through the air duct 325 connected to the second shaft body.

[0056] When the pressure of the molten plastic at the position of the driving shaft 330 reaches a preset value, the pressure sensor 312 feeds back the sensed signal to the control system, and drives the second driving member 120 to start through the control system, thereby causing the conveying shaft 320, the driving shaft 330 and the extrusion head 340 to move in the first direction until the partition block 380 moves into the connecting groove 311, connecting the conveying chamber 350 and the extrusion chamber 360, so that the molten plastic can enter the extrusion chamber 360 from the conveying chamber 350, and because the connecting groove 311 is located in the shell 310 in the third direction close to the machine The side of the frame 100, so when the molten plastic enters the extrusion chamber 360, the molten plastic will continue to increase from the side close to the connecting groove 311 along the third direction, that is, from bottom to top, so that the molten plastic can smoothly enter the extrusion chamber 360 to avoid gas from being re-integrated into the molten plastic. When the extrusion chamber 360 is full of molten plastic, the second driving member 120 is driven again to move the conveying shaft 320, the driving shaft 330 and the extrusion head 340 along the first direction, and the molten plastic is discharged from the discharge port 361 to the injection mold 200 by extrusion of the extrusion head 340.

[0057] Afterwards, the injection molding is completed using the injection mold 200. Then, the second driving member 120 is used to drive the conveying shaft 320, the driving shaft 330 and the extrusion head 340 to reset.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic protection tube injection molding device, characterized in that: It includes a frame, an injection mold and an injection molding tube; the injection mold and the injection molding tube are arranged on the frame in sequence along a first direction, and the first direction is a horizontal direction; the injection molding tube includes a shell, a conveying shaft, a pushing shaft and an extrusion head; a heating element is arranged on the shell, which can heat and melt the plastic; a partition is arranged in the shell, and the partition can divide the shell into a conveying chamber and an extrusion chamber arranged in sequence along the first direction, a feed port is provided on the conveying chamber, and a discharge port is provided on the extrusion chamber; both the conveying shaft and the pushing shaft are spiral structures and are both located in the conveying chamber, and the pushing shaft is located on the side of the conveying shaft away from the feed port in the first direction; both the conveying shaft and the pushing shaft can be rotatably arranged around the first direction, and the rotation speed of the pushing shaft is greater than the rotation speed of the conveying shaft; a plurality of air holes are provided on the pushing shaft, and the air holes are connected to the outside; the extrusion head is located in the extrusion chamber and on the side of the pushing shaft away from the conveying shaft in the first direction; the injection molding tube has a first A state and a second state, when in the first state, the conveying chamber and the extrusion chamber are separated from each other, and when in the second state, the conveying chamber and the extrusion chamber are connected to each other; in the initial state, the injection tube is in the first state, and when the injection tube is in the second state, the molten plastic can be conveyed from the extrusion chamber to the injection mold through the discharge port; the conveying shaft, the driving shaft and the extrusion head can all move along the first direction, and the movement of the conveying shaft, the driving shaft and the extrusion head along the first direction can switch the injection tube from the first state to the second state; a first driving member is arranged on the frame, and the first driving member is used to drive the conveying shaft to rotate around the first direction, a gear ring is fixedly arranged on the conveying shaft, the gear ring is coaxially arranged with the conveying shaft, a partition is arranged on the conveying shaft, and a planetary gear is rotatably arranged on the partition; the conveying shaft can rotate around the first direction relative to the partition, and move synchronously with the partition along the first direction; a gear is arranged on the driving shaft, and the planetary gear is meshed with the gear ring and the gear at the same time.

2. A plastic protection tube injection molding device according to claim 1, characterized in that: There are multiple limit protrusions evenly distributed in the circumferential direction of the partition, and the multiple limit protrusions are all installed on the inner wall of the shell, so that the partition can only move along the first direction and limit the rotation of the partition around the first direction; a second driving member is arranged on the frame, and the second driving member is used to drive the conveying shaft to move along the first direction.

3. A plastic protection tube injection molding device according to claim 2, characterized in that: A transmission shaft is fixedly connected to the conveying shaft, the transmission shaft is arranged along the first direction and is located on the side of the conveying shaft in the first direction away from the driving shaft; a transmission wheel is arranged on the transmission shaft, the first driving member can drive the transmission wheel to rotate around the first direction, and the transmission shaft can rotate around the first direction with the transmission wheel and move relative to the transmission wheel in the first direction; a transmission cylinder is fixedly arranged at the output end of the second driving member, the transmission shaft is installed on the transmission cylinder, and the transmission shaft can move along the first direction with the transmission cylinder and rotate relative to the transmission cylinder in the first direction.

4. A plastic protection tube injection molding device according to claim 1, characterized in that: The conveying shaft includes a first shaft body and a first spiral piece, the first spiral piece is installed on the first shaft body, the pushing shaft includes a second shaft body and a second spiral piece, the second spiral piece is installed on the second shaft body, the second shaft body is hollow inside, the rotation direction of the first spiral piece and the rotation direction of the second spiral piece are the same, a plurality of air holes are opened on the second shaft body, an air passage connected to the outside is opened on the first shaft body, and the air passage is connected to the air hole through the second shaft body.

5. A plastic protection tube injection molding device according to claim 4, characterized in that: The two ends of the second spiral piece along the first direction are respectively called the first end and the second end, the first end is located at a side of the second end close to the first shaft body in the first direction, the first end is slidably connected to the second shaft body, and the second end is fixed to the second shaft body, a third driving member is arranged in the second shaft body, and a moving block is arranged at the output end of the third driving member, and the third driving member can cause the moving block to move in the first direction. A movable groove and a retaining groove are provided on the second shaft body. The movable groove and the retaining groove are both arranged along the first direction. The movable groove is located on the side of the retaining groove close to the central axis of the shell in the second direction. The shell is a cylindrical structure arranged along the first direction, the second direction is perpendicular to the first direction, and the second direction is the radial direction of the shell; a movable plate is slidably arranged in the movable groove, and the size of the movable plate in the first direction is larger than the size of the retaining groove in the first direction. The movable block passes through the movable plate and the retaining groove in sequence in the second direction and is fixedly connected to the first end of the second spiral piece.

6. A plastic protection tube injection molding device according to claim 5, characterized in that: A pressure sensor is arranged in the shell and is located on one side of the driving shaft; the separator is a separator block and is arranged in the circumferential direction of the extrusion head. A connecting groove is provided on the inner wall of the shell. In the initial state, the separator block is located on the side of the connecting groove close to the driving shaft in the first direction and is slidably sealed with the inner wall of the shell. When the separator block moves into the connecting groove along the first direction, the transmission chamber can be connected with the extrusion chamber.

7. A plastic protection tube injection molding device according to claim 6, characterized in that: The connecting groove is located at a side of the shell body close to the frame in a third direction, the third direction is perpendicular to the first direction and the second direction respectively, and the third direction is a vertical direction.

8. The plastic protection tube injection molding device according to claim 3, characterized in that: A plurality of limit grooves are provided on the inner wall of the shell, and the plurality of limit grooves are all arranged along the first direction. The plurality of limit grooves are arranged one-to-one correspondingly to the plurality of limit protrusions, and each limit protrusion is slidably installed in the corresponding limit groove, so that the conveying shaft can rotate around the first direction relative to the partition and move synchronously with the partition along the first direction.

9. The plastic protection tube injection molding device according to claim 1, characterized in that: The dimension of the conveying shaft in the first direction is greater than the dimension of the pushing shaft in the first direction.

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