Leak-proof structure and injection molding machine with it

Abstract

This utility model discloses a leak-proof structure and an injection molding machine having the same, relating to the field of injection molding machine technology. It includes: a barrel, comprising a rear barrel body and a front nozzle; a barrel heater, comprising a front heating sleeve; and a front sheath, connected to the barrel via a fixing structure, the front sheath sequentially comprising a first section, a second section, and a third section. Once leakage occurs at the nozzle, the heated leakage adheres to the front sheath, rather than to the outside of the nozzle, the barrel, the barrel heater, or the gap between the barrel and the barrel heater. After the leakage solidifies, simply removing the front sheath removes the leakage, making the process simple and convenient, and it does not affect the subsequent service life of the injection molding machine, especially the barrel and the barrel heater.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, and in particular to a leak-proof structure and an injection molding machine having the same. Background Technology

[0002] Injection molding machines heat and apply high pressure to thermoplastic or thermosetting plastic in a barrel, injecting the molten plastic into a mold until it fills the mold cavity, creating various shapes of plastic products. However, existing injection molding machines are prone to leakage at the nozzle and other locations during operation. This leaked molten plastic adheres to the barrel and heating element, and can gradually spread throughout the entire barrel assembly. Furthermore, once this molten plastic cools and solidifies, it adheres to the parts, making it difficult to remove. Often, it requires reheating with heat for cleaning, which is cumbersome and shortens the lifespan of the injection molding machine. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a leak-proof structure and an injection molding machine having the same.

[0004] According to a first aspect of the present invention, a leak-proof structure includes: a barrel, comprising a rear barrel body and a front nozzle; a barrel heater, sleeved on the outer wall of the barrel body, with a heater installation gap between the barrel heater and the outer wall of the barrel, the barrel heater including a front heating sleeve; and a front sheath, the front sheath being connected to the barrel by a fixing structure, the front sheath sequentially comprising a first section, a second section, and a third section, the first section covering the outer wall of the nozzle, the second section sealing the heater installation gap, and the third section covering the outer wall of the front heating sleeve.

[0005] According to some embodiments of the present invention, the second section of the front sheath is connected to the first section of the front sheath and the third section of the front sheath, and the second section of the front sheath covers the front end of the cylinder and the front end of the front heating sleeve of the front heating sleeve.

[0006] According to some embodiments of this utility model, the fixing structure adopts metal hoop, hose clamp, binding rope or Velcro.

[0007] According to some embodiments of the present invention, the fixing structure includes a first fixing structure and a second fixing structure. The first fixing structure is located at the front part of the outer side wall of the first section of the front sheath, and the second fixing structure is located at the rear part of the outer side wall of the first section of the front sheath.

[0008] According to some embodiments of the present invention, a gap is left between adjacent barrel heaters to form a heater gap, and the rear part of the front sheath covers at least one of the heater gaps.

[0009] According to some embodiments of the present invention, the fixing structure includes a third fixing structure and a fourth fixing structure. The third fixing structure is located at the front part of the outer side wall of the third section of the front sheath, and the fourth fixing structure is located at the rear part of the outer side wall of the third section of the front sheath. The fourth fixing structure corresponds to the gap between the heater on the rear side of the front heating sleeve.

[0010] According to some embodiments of the present invention, it also includes a machine base, the rear side of the cylinder is connected to the front side of the machine base, the cylinder heater includes a rear heating sleeve, and a rear protective sleeve is fitted on the outer side wall of the rear side of the cylinder or the outer side wall of the rear heating sleeve, the rear end of the rear protective sleeve abuts against the front side wall of the machine base.

[0011] According to some embodiments of the present invention, the rear end of the rear sheath has a rear sheath folded edge, and the fixing structure includes a fifth fixing structure and a sixth fixing structure. The fifth fixing structure is located at the front part of the outer side wall of the rear sheath, and the sixth fixing structure is located at the rear part of the outer side wall of the rear sheath. The sixth fixing structure and the front side wall of the base abut against the front and rear sides of the rear sheath folded edge.

[0012] The leak-proof structure according to the embodiment of this utility model has at least the following technical effects: 1. Once the nozzle leaks glue, the heated glue will adhere to the front cover, rather than to the outside of the nozzle, the barrel, the barrel heater, or the gap between the barrel and the barrel heater. The glue will fall off naturally after it solidifies, or it can be removed with simple tools, or the glue can be removed by removing the front cover. It is simple and convenient to handle, and it will not affect the subsequent service life of the injection molding machine, especially the barrel and the barrel heater. 2. The rear sleeve protects the rear side of the cylinder. In addition to dealing with possible glue leakage on the input side of the cylinder, it can also deal with the leakage of granules, dust and other materials falling from the hopper or other positions, preventing these materials from solidifying and adhering to the surface of the cylinder or cylinder heater after falling on the rear side of the cylinder. 3. The fixing structure can use metal hoops, hose clamps, ropes or Velcro, which facilitates the fixing and disassembly and replacement of the front and rear protective sleeves; 4. The front and rear sheaths have a simple and easy-to-use structure, low cost, and can be reused multiple times until they are damaged and replaced, which is conducive to the promotion and application of the technology.

[0013] According to a second aspect embodiment of the present invention, an injection molding machine includes a leak-proof structure according to the first aspect embodiment of the present invention. A waste heat collection sleeve is provided outside the barrel, and the waste heat collection sleeve has a barrel receiving cavity inside. The waste heat collection sleeve has receiving cavity through holes on the front and rear sides, and the hole walls of the receiving cavity through holes are provided with heat insulation cotton strips. The barrel body is located inside the barrel receiving cavity, and the front and rear ends of the barrel body extend through the receiving cavity through holes. The outer side wall of the barrel body or the outer side wall of the third section of the front protective sleeve abuts against the heat insulation cotton strips.

[0014] According to some embodiments of the present invention, a nozzle heater is provided on the outer wall of the nozzle.

[0015] The injection molding machine according to the embodiments of this utility model has at least the following beneficial effects: 1. Once the nozzle leaks glue, the heated glue will adhere to the front cover, rather than to the outside of the nozzle, the barrel, the barrel heater, or the gap between the barrel and the barrel heater. After the glue solidifies, you can simply remove the front cover to clean it up. It is simple and convenient to handle and will not affect the service life of the injection molding machine, especially the barrel and the barrel heater. 2. The waste heat generated during the heating process of the material cylinder is collected by the waste heat collection sleeve. The airflow carrying the waste heat enters the hopper through the air outlet pipe to supplement the heating and drying work of the hopper. This not only reduces the outward dissipation of waste heat and improves the working environment, but also reduces the energy consumption when heating the hopper, thus achieving the effect of energy saving and emission reduction.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural schematic diagram of the injection molding machine according to this utility model; Figure 2 This is a schematic diagram of the leak-proof structure of this utility model; Figure 3 This is a schematic diagram of the installation of the front cover of this utility model; Figure 4 This is a schematic diagram of the working process of this utility model; Figure 5 This is a perspective view of the waste heat collection sleeve of this utility model.

[0018] Figure label: Cylinder 100, cylinder body 110, front end of cylinder body 111, nozzle 120, nozzle heater 121, screw 130; cylinder heater 200, heater mounting gap 201, front heating sleeve 210, front end of front heating sleeve 211, rear heating sleeve 220, heat insulation outer layer 230, heater gap 240, thermocouple 241; front sheath 300, first section of front sheath 310, second section of front sheath 320, third section of front sheath 330; rear sheath 400, rear sheath flange 410; fixing structure 500, first fixing structure 510, second fixing structure 520, third fixing structure Fixed structure 530, fourth fixed structure 540, fifth fixed structure 550, sixth fixed structure 560; waste heat collection sleeve 600, material cylinder receiving cavity 601, receiving cavity through hole 602, heat insulation cotton strip 603, sleeve shell 610, elastic buckle 611, heat insulation layer 612, heat conduction layer 613, heat pipe 620, loop straight section 621, loop turning section 622, collection sleeve bottom cover plate 630, buckle plate 631; mold 700; machine base 800, air inlet pipe 810, air outlet pipe 820, fan 821, electric heater 822, hopper 830; glue leakage 900, material leakage 901. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "multiple" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] The following is for reference. Figure 1 and Figure 2 Describes a leak-proof structure according to an embodiment of the present invention.

[0024] like Figure 1 and Figure 2 As shown, the leak-proof structure according to an embodiment of the present invention includes a material cylinder 100, a material cylinder heater 200, and a front sheath 300.

[0025] The barrel 100 includes a rear barrel 110 and a front nozzle 120; a barrel heater 200 is sleeved on the outer wall of the barrel 110, and a heater installation gap 201 is left between the barrel heater 200 and the outer wall of the barrel 100. The barrel heater 200 includes a front heating sleeve 210; a front sheath 300 is connected to the barrel 100 through a fixing structure 500. The front sheath 300 includes a first section 310, a second section 320, and a third section 330 in sequence. The first section 310 covers the outer wall of the nozzle 120, the second section 320 seals the heater installation gap 201, and the third section 330 covers the outer wall of the front heating sleeve 210.

[0026] For example, such as Figure 1 and Figure 2 As shown, the barrel 100 includes a rear barrel 110 and a front nozzle 120. The barrel 110 has a cavity capable of containing granular plastic or fluid plastic. The fluid plastic can be ejected from the nozzle 120 and injected into the mold cavity. A barrel heater 200 is sleeved on the outer wall of the barrel 110 and is responsible for melting the granular plastic in the barrel 100 into fluid plastic. A heater mounting gap 201 is provided between the barrel heater 200 and the outer wall of the barrel 100. The barrel heater 200 includes a front heating sleeve 210, which is located at the front of the barrel 100. The front sleeve 300 is connected to the barrel 100 by a fixing structure 500, that is, the front sleeve 300 and the barrel 100 are relatively fixed during operation. (Refer to...) Figure 3 The front sheath 300 includes a first section 310, a second section 320, and a third section 330. The first section 310 covers the outer wall of the nozzle 120. The second section 320 seals the heater installation gap 201 between the outer wall of the cylinder 110 and the outer wall of the front heating sleeve 210. The third section 330 covers the outer wall of the front heating sleeve 210.

[0027] In actual operation, granular plastic is added into the barrel 100. The barrel 100 is heated by the barrel heater 200, causing the plastic inside the barrel 100 to melt into a viscous fluid. Then, it is injected into the mold cavity through the nozzle 120. The front sheath 300 is on the barrel 100. The first section 310 of the front sheath covers the outer wall of the nozzle 120 to protect the nozzle 120. The second section 320 of the front sheath seals the gap between the outer wall of the barrel 110 and the outer wall of the front heating sleeve 210. The third section 330 of the front sheath covers the outer wall of the front heating sleeve 210 to protect the front heating sleeve 210 at the front position of the barrel 100.

[0028] In practice, the nozzle 120 is prone to glue leakage. The leaked molten plastic will form glue 900 that adheres to the front barrel 100 and barrel heater 200 and gradually spreads to the entire barrel 100. It is difficult to remove. At best, this glue leakage will increase the temperature process error of the barrel heating device and affect production. At worst, the barrel heater 200 will burn glue and cause a serious fire.

[0029] The leak-proof structure of this utility model, during operation, refers to... Figure 4 If glue leakage occurs, i.e., glue 900 leaks from nozzle 120, the heated glue 900 will adhere to the front sleeve 300 due to its protective function, and will not adhere to the outside of nozzle 120, barrel 100, barrel heater 200, or the gap between barrel 100 and barrel heater 200. After the machine is stopped and the glue 900 solidifies, it will fall off naturally, or it can be removed using simple tools such as pliers. The process is simple and convenient, and will not affect the injection molding machine.

[0030] The front cover 300 has a simple and easy-to-use structure, low cost, and can be reused multiple times until it is damaged and replaced. When the front cover 300 is removed, the leaking adhesive 900 can also be cleaned up, which is conducive to the promotion and application of the technology.

[0031] It is conceivable that the first section 310, the second section 320, and the third section 330 of the front sheath 300 can be integrated as one unit or can be set separately. If the first section 310, the second section 320, and the third section 330 of the front sheath are set separately, they are respectively fixedly installed on the material cylinder 100 by the fixing structure 500.

[0032] In some embodiments of this utility model, reference is made to Figure 2 , Figure 3The second section 320 of the front sheath is connected to the first section 310 and the third section 330 of the front sheath. The second section 320 of the front sheath covers the front end 111 of the cylinder 110 and the front end 211 of the front heating sleeve 210, which makes it convenient for the front sheath 300 to cover the material cylinder 100 for fixation.

[0033] In some embodiments of this utility model, the fixing structure 500 uses metal hoop, hose clamp, rope or Velcro to facilitate the fixing of the front cover 300.

[0034] Furthermore, the fixing structure 500 uses iron or stainless steel hoops, which are used to secure the front sheath 300 to the outside.

[0035] Furthermore, the fixing structure 500 uses a hose clamp, which is tightened around the front sheath 300 to fix the front sheath 300.

[0036] Furthermore, the fixing structure 500 uses a binding rope, which is tied tightly to the outside of the front sheath 300 with iron hoops to fix the front sheath 300.

[0037] In some embodiments of this utility model, the fixing structure 500 includes a first fixing structure 510 and a second fixing structure 520. The first fixing structure 510 is located at the front part of the outer side wall of the first section 310 of the front sheath, and the second fixing structure 520 is located at the rear part of the outer side wall of the first section 310 of the front sheath. This means that the first fixing structure 510 fixes the first section 310 of the front sheath at the front side of the nozzle 120, and the second fixing structure 520 fixes the first section 310 of the front sheath at the rear side of the nozzle 120, ensuring that the first section 310 of the front sheath can cover and protect the nozzle 120.

[0038] In some embodiments of this invention, a gap is left between adjacent barrel heaters 200 to form a heater gap 240, and the rear part of the front sheath 300 covers at least one heater gap 240 to prevent adhesive leakage into the heater gap 240. The heater gap 240 between the barrel heaters 200 can prevent the barrel heaters 200 from squeezing against each other, reducing the chance of damage to the barrel heaters 200 due to external impact.

[0039] Furthermore, a thermocouple 241 is installed on the heater gap 240. Besides preventing the barrel heaters 200 from squeezing against each other, the heater gap 240 also serves to fix the installation position of the thermocouple 241. The thermocouple 241 is used to detect the temperature at various points inside the barrel 110, thereby ensuring that the heating operation inside the barrel 110 proceeds normally.

[0040] Furthermore, the heater gap 240 is separated by heat insulation material, and the thermocouple 241 is inserted into the side wall of the cylinder 110. This reduces or avoids the direct impact of the heating of the cylinder heater 200 on the detection results of the thermocouple 241, ensuring that the thermocouples 241 at each location can accurately monitor the temperature of their corresponding positions inside the cylinder 110, without being affected by the heat transfer of the cylinder heater 200.

[0041] Furthermore, the outer wall of the barrel heater 200 is covered with a heat-insulating outer layer 230.

[0042] In some embodiments of this utility model, the fixing structure 500 includes a third fixing structure 530 and a fourth fixing structure 540. The third fixing structure 530 is located at the front part of the outer wall of the third section 330 of the front sheath, and the fourth fixing structure 540 is located at the rear part of the outer wall of the third section 330 of the front sheath. The fourth fixing structure 540 corresponds to the heater gap 240 on the rear side of the front heating sleeve 210. This means that the third fixing structure 530 fixes the third section 330 of the front sheath at the front side of the front heating sleeve 210, and the fourth fixing structure 540 fixes the third section 330 of the front heating sleeve 210 at the rear side of the front heating sleeve 210, ensuring that the third section 330 of the front sheath can cover and protect the position of the front heating sleeve 210 on the cylinder 110.

[0043] In some embodiments of this utility model, reference is made to Figure 1 , Figure 4 The present invention also includes a base 800, the rear side of the cylinder 110 is connected to the front side of the base 800, the cylinder heater 200 includes a rear heating sleeve 220, a rear protective sleeve 400 is fitted on the outer side wall of the rear side of the cylinder 110 or the outer side wall of the rear heating sleeve 220, and the rear end of the rear protective sleeve 400 abuts against the front side wall of the base 800.

[0044] In practice, the rear side of the material cylinder 100 is often close to the hopper 830, making it easy for raw material granules, dust and other particles to fall onto the high-temperature rear side of the material cylinder heater 200 or the rear side of the material cylinder 100 and adhere to the surrounding area, increasing temperature process errors, power consumption and fire hazards.

[0045] In this embodiment, the rear sheath 400 is positioned at the rear side of the cylinder 110 and can address potential glue leakage accidents on the input side of the cylinder 110. If glue leakage occurs, i.e., glue 900 leaks from the rear side of the cylinder 110, the rear sheath 400 can also provide protection, preventing the leaked glue from adhering to the material cylinder 100 or the material cylinder heater 200.

[0046] In addition, the rear sheath 400 can also handle the leakage of granules, dust, etc. from the hopper 830 or other locations, preventing these leakage materials 901 from solidifying and adhering to the surface of the hopper 100 or the hopper heater 200 after falling to the rear side of the hopper 100 or the hopper heater 200.

[0047] In some embodiments of this utility model, the rear sheath 400 has a rear sheath flange 410 at its rear end. The fixing structure 500 includes a fifth fixing structure 550 and a sixth fixing structure 560. The fifth fixing structure 550 is located at the front of the outer side wall of the rear sheath 400, and the sixth fixing structure 560 is located at the rear of the outer side wall of the rear sheath 400. The sixth fixing structure 560 and the front side wall of the base 800 abut against the front and rear sides of the rear sheath flange 410. This means that the fifth fixing structure 550 fixes the front side of the rear sheath 400, and the sixth fixing structure 560 fixes the rear side of the rear sheath 400, ensuring that the rear sheath 400 can cover and protect the rear side of the cylinder 110 or the rear heating sleeve 220 position on the cylinder 110. In particular, the design of clamping the rear sheath folded edge 410 between the sixth fixing structure 560 and the front side wall of the base 800 can force the leaking adhesive 900 to push open the rear sheath folded edge 410 and squeeze out from the gap between the rear sheath folded edge 410 and the front side wall of the base 800 when it leaks out from the rear side of the cylinder 110. This limits the spread of the leaking adhesive 900 as much as possible and reduces the difficulty of subsequent cleaning.

[0048] In some embodiments of this utility model, the fixing structure 500 is fixed to the outer wall of the front sheath 300 and the rear sheath 400 at the position corresponding to the heater gap 240. That is, the number of fixing structures 500 can be increased as needed, and each fixing structure 500 is installed corresponding to the position of the heater gap 240 to ensure that the front sheath 300 and the rear sheath 400 are more stable.

[0049] In some embodiments of this utility model, the front sheath 300 and the rear sheath 400 adopt an aluminum foil heat insulation film structure. The aluminum foil on the heat insulation film can reflect most of the heat radiation, thereby reducing the absorption of heat by the barrel heater 200 and reducing the waste of heat energy. Moreover, the aluminum foil is also resistant to the corrosion of hot melt plastic, preventing the front sheath 300 and the rear sheath 400 from being damaged when the adhesive 900 adheres to them, thus causing the protective effect to fail. In particular, it prevents the barrel 100 and the barrel heater 200 from overheating due to the adhesion of the adhesive 900, eliminating the hidden dangers of burns and fire accidents, and also preventing the adhesive from adhering to the area around the barrel 100, barrel heater 200 and other devices, reducing temperature process errors and power consumption, and reducing the impact on the subsequent service life of the barrel 100 and barrel heater 200.

[0050] Furthermore, the front sheath 300 and the rear sheath 400 can also be made of high-temperature resistant flame-retardant cotton or aerogel. The front sheath 300 and the rear sheath 400 using materials with similar effects to those in the prior art are within the scope of this patent protection.

[0051] An injection molding machine according to a second aspect embodiment of the present invention includes a leak-proof structure according to the first aspect embodiment of the present invention, with reference to... Figure 1 , Figure 2 A waste heat collection sleeve 600 is provided outside the material cylinder 100. The waste heat collection sleeve 600 has a material cylinder receiving cavity 601 inside. The waste heat collection sleeve 600 has receiving cavity through holes 602 on the front and rear sides. The walls of the receiving cavity through holes 602 are provided with heat insulation cotton strips 603. The cylinder body 110 is located inside the material cylinder receiving cavity 601. The front and rear ends of the cylinder body 110 extend out through the receiving cavity through holes 602. The outer wall of the cylinder body 110 or the outer wall of the third section 330 of the front sheath abuts against the heat insulation cotton strips 603.

[0052] In actual operation, the barrel heater 200 on the barrel 100 is activated to heat and melt the plastic inside the barrel 100. The residual heat generated during heating is collected by the residual heat collection sleeve 600 and used for auxiliary heating in other areas. The receiving cavity through-hole 602, in conjunction with the heat insulation strip 603, adheres to the outer wall of the barrel body 110 or the outer wall of the third section 330 of the front sheath, ensuring that the heat generated by the barrel heater 200 is retained as much as possible within the barrel receiving cavity 601. Besides heat insulation, the heat insulation strip 603 also prevents the leaking adhesive 900 from seeping into the barrel receiving cavity 601 through the receiving cavity through-hole 602.

[0053] The injection molding machine according to the present invention, by adopting the above-mentioned anti-leakage structure, reduces the difficulty of handling the situation after the injection molding machine leaks glue. Moreover, the structure is simple and easy to use, which is conducive to the promotion and application of the technology in small and medium-sized injection molding machines.

[0054] It is conceivable that the waste heat collection sleeve 600 can adopt other barrel protective covers, barrel insulation covers, and other devices in the existing technology. That is, the leak-proof structure of this utility model is also applicable to barrel protective covers, barrel insulation covers, and other devices of injection molding machines.

[0055] In some embodiments of this utility model, a screw 130 is built into the cylinder 110. A hopper 830 is provided on the base 800. An air inlet pipe 810 and an air outlet pipe 820 are connected between the waste heat collection sleeve 600 and the hopper 830. The air outlet pipe 820 is connected to a fan 821 and an electric heater 822, forming a highly efficient single-loop waste heat recovery circulation structure. After the fan 821 and the electric heater 822 are started, the generated hot airflow can circulate along the path of waste heat collection sleeve 600 – air outlet pipe 820 – hopper 830 – air inlet pipe 810 – waste heat collection sleeve 600.

[0056] In actual operation, the injection molding machine mainly works through the following steps: Feeding: Granular plastic is added from hopper 830 into barrel 100. The outside of the barrel is heated by barrel heater 200, which melts the plastic into a viscous flow state. Plasticization: Under the rotation and shearing action of the screw 130, the plastic is gradually plasticized, melted and homogenized; Reheating: The heating and melting temperature of the barrel 100 is higher than the heating and drying temperature of the hopper 830. The waste heat generated by the barrel 100 during the heating process is collected by the waste heat collection sleeve 600 to reheat the hopper 300. Injection: When the plastic reaches a molten state, the screw 130, driven by the hydraulic system inside the machine base 800, injects the molten plastic into the cavity of the closed mold 700 under high pressure; Cooling and solidification: The molten plastic cools and solidifies in the mold 700 to form a plastic product that conforms to the shape of the cavity; Part removal: After the mold 700 is opened, the molded plastic product is ejected by the ejection device, completing one cycle.

[0057] In some embodiments of this utility model, reference is made to Figure 4 , Figure 5 The waste heat collection sleeve 600 includes a sleeve shell 610 and a heat pipe 620. The heat pipe 620 is located inside the sleeve shell 610, and its two ends are connected to the air inlet pipe 810 and the air outlet pipe 820, respectively. The heat pipe 620 is bent to form several bending loops, each including a straight loop portion 621 and a loop turning portion 622. The straight loop portions 621 are arranged to surround and form a material cylinder receiving cavity 601. This design helps to increase the heat exchange area between the heat pipe 620 and the material cylinder 100, thereby improving the heat absorption efficiency of the waste heat collection sleeve 600.

[0058] In some embodiments of this utility model, an elastic buckle 611 is provided on the lower part of the side wall of the sleeve housing 610, a collection sleeve bottom cover plate 630 is provided on the lower side of the sleeve housing 610, and a buckle plate 631 is provided on the outer edge of the collection sleeve bottom cover plate 630. The elastic buckle 611 can lock the buckle plate 631, ensuring that the sleeve housing 610 and the collection sleeve bottom cover plate 630 can be flexibly disassembled and assembled.

[0059] In a further embodiment of this utility model, a heat insulation layer 612 is provided between the heat pipe 620 and the housing 610 to reduce the outward dissipation of residual heat generated by the barrel heater 200.

[0060] In a further embodiment of this utility model, a heat-conducting layer 613 is covered on the outer wall of the bending circuit to enable the waste heat generated by the barrel heater 200 to be transferred into the heat pipe 620 more quickly and evenly.

[0061] In some embodiments of this utility model, a nozzle heater 121 is provided on the outer wall of the nozzle 120 to heat the fluid plastic inside the nozzle 120, so as to ensure that the fluid plastic can be smoothly ejected from the nozzle 120.

[0062] Other components and operations of the injection molding machine according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0063] The following is for reference. Figure 1 and Figure 2 The leak-proof structure according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0064] like Figure 1 and Figure 2 As shown, the injection molding machine according to the embodiment of this utility model includes a barrel 100, a barrel heater 200, a front sleeve 300, a rear sleeve 400, a fixing structure 500, a waste heat collection sleeve 600, a mold 700, and a machine base 800. The front sleeve 300 and the rear sleeve 400 serve to prevent glue leakage 900.

[0065] The base 800 is connected to an air inlet pipe 810, an air outlet pipe 820, a fan 821, an electric heater 822, and a hopper 830.

[0066] The material barrel 100 is located on the front side of the machine base 800. The material barrel 100 includes a barrel body 110 and a nozzle 120, and a screw 130 is built into the barrel body 110. A nozzle heater 121 is provided on the nozzle 120, and the nozzle 120 points towards the mold 700.

[0067] A barrel heater 200 is provided on the barrel 100. The barrel heater 200 includes a front heating sleeve 210, a rear heating sleeve 220, a heat insulation outer layer 230, and a heater gap 240. A thermocouple 241 is provided in the heater gap 240.

[0068] The front sheath 300 is located on the front side of the material cylinder 100, and the rear sheath 400 is located on the rear side of the material cylinder 100. The front sheath 300 includes a first section 310, a second section 320, and a third section 330. The rear sheath 400 has a rear sheath flange 410. A fixing structure 500 is used to fix the front sheath 300 and the rear sheath 400. The fixing structure 500 includes a first fixing structure 510, a second fixing structure 520, a third fixing structure 530, a fourth fixing structure 540, a fifth fixing structure 550, and a sixth fixing structure 560.

[0069] The waste heat collection sleeve 600 includes a material cylinder receiving cavity 601, a receiving cavity through hole 602, a heat insulation cotton strip 603, a sleeve shell 610, an elastic buckle 611, a heat insulation layer 612, a heat conduction layer 613, a heat pipe 620, a straight loop section 621, a loop turning section 622, a collection sleeve bottom cover plate 630, and a buckle plate 631.

[0070] According to the leak-proof structure of this utility model embodiment, by setting it up in this way, at least the following effects can be achieved: once a leakage occurs, when the leaking glue 900 leaks from the nozzle 120, the heated leaking glue 900 will adhere to the front sheath 300, and will not adhere to the outside of the nozzle 120, the barrel 100, the barrel heater 200, or the gap between the barrel 100 and the barrel heater 200; after the leaking glue 900 solidifies, simply removing the front sheath 300 is equivalent to removing the solidified leaking glue 900 as well, which is simple and convenient to handle, and will not affect the subsequent service life of the injection molding machine, especially the barrel 100 and the barrel heater 200.

[0071] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A leak-proof structure, characterized in that, include: The barrel (100) includes a rear barrel (110) and a front nozzle (120). A barrel heater (200) is sleeved on the outer wall of the barrel (110). A heater installation gap (201) is left between the barrel heater (200) and the outer wall of the barrel (100). The barrel heater (200) includes a front heating sleeve (210). A front sheath (300) is connected to the material cylinder (100) via a fixing structure (500). The front sheath (300) includes a first section (310), a second section (320), and a third section (330) in sequence. The first section (310) covers the outer wall of the nozzle (120), the second section (320) blocks the heater installation gap (201), and the third section (330) covers the outer wall of the front heating sleeve (210).

2. The leak-proof structure according to claim 1, characterized in that, The second section (320) of the front sheath is connected to the first section (310) of the front sheath and the third section (330) of the front sheath. The second section (320) of the front sheath covers the front end (111) of the cylinder (110) and the front end (211) of the front heating sleeve (210).

3. The leak-proof structure according to claim 1, characterized in that, The fixing structure (500) is made of metal hoops, hose clamps, ropes or Velcro.

4. The leak-proof structure according to claim 1, characterized in that, The fixing structure (500) includes a first fixing structure (510) and a second fixing structure (520). The first fixing structure (510) is located at the front part of the outer side wall of the first section (310) of the front sheath, and the second fixing structure (520) is located at the rear part of the outer side wall of the first section (310) of the front sheath.

5. The leak-proof structure according to claim 1, characterized in that, A gap is left between adjacent barrel heaters (200) to form a heater gap (240), and the rear of the front sheath (300) covers at least one of the heater gaps (240).

6. The leak-proof structure according to claim 5, characterized in that, The fixing structure (500) includes a third fixing structure (530) and a fourth fixing structure (540). The third fixing structure (530) is located at the front part of the outer side wall of the third section (330) of the front sheath, and the fourth fixing structure (540) is located at the rear part of the outer side wall of the third section (330) of the front sheath. The fourth fixing structure (540) corresponds to the heater gap (240) on the rear side of the front heating sleeve (210).

7. The leak-proof structure according to claim 1, characterized in that, It also includes a base (800), the rear side of the cylinder (110) is connected to the front side of the base (800), the cylinder heater (200) includes a rear heating sleeve (220), a rear protective sleeve (400) is fitted on the outer side wall of the rear side of the cylinder (110) or the outer side wall of the rear heating sleeve (220), and the rear end of the rear protective sleeve (400) abuts against the front side wall of the base (800).

8. The leak-proof structure according to claim 7, characterized in that, The rear sheath (400) has a rear sheath flange (410) at its rear end. The fixing structure (500) includes a fifth fixing structure (550) and a sixth fixing structure (560). The fifth fixing structure (550) is located at the front part of the outer wall of the rear sheath (400), and the sixth fixing structure (560) is located at the rear part of the outer wall of the rear sheath (400). The sixth fixing structure (560) and the front side wall of the base (800) abut against the front and rear sides of the rear sheath flange (410).

9. An injection molding machine, characterized in that, The leak-proof structure includes any one of claims 1 to 8, wherein a waste heat collection sleeve (600) is provided outside the material cylinder (100), the waste heat collection sleeve (600) has a material cylinder receiving cavity (601) inside, the waste heat collection sleeve (600) has receiving cavity through holes (602) on the front and rear sides, and the hole wall of the receiving cavity through hole (602) is provided with heat insulation cotton strips (603). The cylinder (110) is located inside the material cylinder receiving cavity (601). The front and rear ends of the cylinder (110) extend through the receiving cavity through hole (602). The outer wall of the cylinder (110) or the outer wall of the third section (330) of the front sheath presses against the heat insulation cotton strip (603).

10. The injection molding machine according to claim 9, characterized in that, A nozzle heater (121) is provided on the outer wall of the nozzle (120).

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