Hot runner device with high sealing performance
By adding elastic pads to the hot runner device to provide elastic support and deformation space, the problem of insufficient sealing between the shunt plate and the hot nozzle is solved, reducing the risk of extravasation of the rubber material and improving sealing.
Patent Information
- Application Number
- CN202420801311.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-04-17
AI Technical Summary
In the existing hot runner device, the sealing density between the shunt plate and the hot nozzle is poor, resulting in the problem of extravasation of the glue.
Add an elastic pad below the hot nozzle to provide upward elastic support, ensure that the shunt plate and the hot nozzle are in close contact, and provide deformation space when hot melt adhesive is passed into the shunt plate to avoid expansion from acting as the spacer On the hot pad.
It effectively reduces the risk of extravasation of the rubber material, ensures the sealing between the shunt plate and the hot nozzle, prevents damage to the shunt plate, thermal insulation pad or the first template, and reduces heat loss.
Smart Images
Figure CN222360553U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection hot runners, in particular to a hot runner device with strong sealing performance. Background Art
[0002] Hot runner devices are commonly used in injection molds. They are a collection of heating components that inject melted plastic into the cavity of the mold. Hot runner systems are generally composed of gates, manifolds, temperature control boxes, cylinder components, etc. The gate form directly determines the selection of hot runner systems and the manufacture of molds, so hot runner devices are often divided into open hot runner devices and valve needle hot runner devices.
[0003] See also Figure 1 , is an existing hot runner device, which includes a first template 100, a second template 200, a manifold 300 and a hot nozzle 400, wherein the manifold 300 is arranged between the first template 100 and the second template 200, and is connected to the hot nozzle 400. During injection molding, the molten plastic flows out of the manifold 300 and enters the hot nozzle 400. In order to ensure that the plastic material does not seep out along the connection between the manifold 300 and the hot nozzle 400 during the injection molding process, it is necessary to add a heat insulation pad 500 between the first template 100 and the manifold 300 to prevent the heat loss of the manifold At the same time, the manifold 300 is limited to ensure that the manifold 300 and the hot nozzle 400 are tightly fitted; however, the hardness of the existing thermal insulation block 500 is greater than the hardness of the first template 100. During the injection molding process, the internal pressure of the hot runner device is relatively large, resulting in the thermal insulation block 500 exerting a strong reverse push force on the first template 100, and there is a risk that the thermal insulation block 500 will be embedded in the first template 100, making it impossible for the manifold 300 and the hot nozzle 400 to be tightly fitted, and finally the rubber will still seep out along the gap between the manifold 300 and the hot nozzle 400.
[0004] Therefore, it is necessary to provide a technical solution to solve the above problems. Utility Model Content
[0005] The utility model solves the problem that the sealing tightness between the manifold and the hot nozzle is poor and the rubber material easily leaks out in the existing hot runner device.
[0006] To achieve the above object, the utility model provides a hot runner device with strong sealing performance, including a first mold plate, a second mold plate, a manifold, a hot nozzle, a heat insulation pad and an elastic pad, wherein:
[0007] A containing cavity is provided in the middle of the second template; the diverter plate and the hot nozzle are both provided in the containing cavity, and the diverter plate is located above the hot nozzle and is in contact with the hot nozzle; the thermal insulation pad is provided above the diverter plate and is in contact with the diverter plate; an outwardly protruding annular step is provided on the top of the hot nozzle, and a flange is provided on the outer sleeve of the hot nozzle, and the flange abuts on the second template, and the elastic pad is provided between the annular step and the flange, and the two ends are respectively in contact with the annular step and the flange; the first template is provided above the second template and is in contact with the thermal insulation pad.
[0008] More specifically, the elastic pad is composed of a plurality of elastic sheets which are stacked.
[0009] More specifically, the hot nozzle includes a body, a heater, a sprue sleeve and a nozzle core; the annular step is arranged on the body, and a rubber flow channel is opened inside the body; the heater sleeve is arranged on the outside of the body; the sprue sleeve is installed at the bottom of the body; the nozzle core is arranged at the bottom of the body and installed inside the sprue sleeve, and the nozzle core is provided with a glue outlet hole connected to the rubber flow channel.
[0010] More specifically, the heater includes a sleeve and a heating wire. The sleeve is made of copper and is sleeved on the body and in close contact with the body. The heating wire is arranged on the sleeve.
[0011] More specifically, a sheath is disposed outside the sleeve, and the sheath is made of steel.
[0012] More specifically, a temperature sensing wire is disposed outside the main body, and the temperature sensing wire is in contact with the main body.
[0013] More specifically, a guide ring extending inwardly and obliquely is provided at the bottom of the sprue sleeve, and the guide ring is located below the glue outlet hole.
[0014] More specifically, the inner diameter of the guide ring gradually decreases from top to bottom, and the angle between the inner wall surface and the horizontal plane is 40°-60°.
[0015] More specifically, the wall thickness of the guide ring gradually decreases from top to bottom.
[0016] The technical effects of a hot runner device with strong sealing performance involved in the utility model are:
[0017] The present application adds an elastic pad under the hot nozzle to provide the hot nozzle with an upward elastic supporting force. In this way, even if the insulating pad is subjected to excessive pushing force and is embedded in the first template, the hot nozzle will still maintain close contact with the diverter plate under the action of the elastic supporting force, thereby minimizing the risk of adhesive leakage. In addition, the design of the elastic pad also provides a deformation space for the diverter plate. When hot melt adhesive is passed into the diverter plate and the diverter plate expands due to heat, the expansion of the diverter plate can be converted into the compression of the elastic pad, thereby preventing the expansion of the diverter plate from acting on the insulating pad, thereby preventing the diverter plate, the insulating pad or the first template from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of an existing hot runner device;
[0019] Figure 2 It is a structural schematic diagram of a hot runner device with strong sealing performance involved in the utility model;
[0020] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;
[0021] Figure 4 for Figure 2 A magnified schematic diagram of point B in the middle.
[0022] Markings in the figure:
[0023] 1. First template; 2. Second template; 3. Diverter plate; 4. Hot nozzle; 5. Insulation pad; 6. Elastic pad; 7. Flange;
[0024] 41. annular step; 42. body; 421. rubber flow channel; 43. heater; 431. sleeve; 432. heating wire; 433. sheath; 44. gate sleeve; 441. guide ring; 442. rubber storage position; 45. nozzle core; 451. glue outlet hole. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0026] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element at the same time; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.
[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0028] In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0029] In order to more clearly illustrate the technical solution of the utility model, a preferred embodiment is provided below. Figure 1 to Figure 4 A hot runner device with strong sealing performance comprises a first mold plate 1, a second mold plate 2, a manifold 3, a hot nozzle 4, a heat insulating pad 5 and an elastic pad 6, wherein:
[0030] A accommodating cavity is provided in the middle of the second template 2; the diverter plate 3 and the hot nozzle 4 are both provided in the accommodating cavity, and the diverter plate 3 is located above the hot nozzle 4 and in contact with the hot nozzle 4; the thermal insulation pad 5 is provided above the diverter plate 3 and in contact with the diverter plate 3; the top of the hot nozzle 4 is provided with an outwardly protruding annular step 41, the outer sleeve of the hot nozzle 4 is provided with a flange 7, the flange 7 rests on the second template 2, the elastic pad 6 is provided between the annular step 41 and the flange 7, and the two ends are respectively in contact with the annular step 41 and the flange 7; the first template 1 is provided above the second template 2, and in contact with the thermal insulation pad 5.
[0031] The utility model relates to a hot runner device with strong sealing performance, which is different from the prior art in that an elastic pad 6 is added under the hot nozzle 4 in the utility model, so that the hot nozzle 4 obtains an upward elastic supporting force, so that even if the thermal insulation pad 5 is subjected to excessive pushing force and embedded in the first template 1, the hot nozzle 4 will still maintain close contact with the diverter plate 3 under the action of the elastic supporting force, thereby minimizing the risk of rubber leakage; in addition, the design of the elastic pad 6 also provides a deformation space for the diverter plate 3. When hot melt adhesive is passed into the diverter plate 3 and it expands due to heat, the expansion of the diverter plate 3 can be converted into the compression of the elastic pad 6, thereby avoiding the expansion of the diverter plate 3 from acting on the thermal insulation pad 5, thereby preventing the diverter plate 3, the thermal insulation pad 5 or the first template 1 from being damaged.
[0032] In this embodiment, the elastic pad 6 is composed of a plurality of elastic sheets stacked in layers. The above design increases the difficulty of heat transfer at the elastic pad 6, thereby reducing the heat loss of the body 42.
[0033] In this embodiment, the hot nozzle 4 includes a body 42, a heater 43, a sprue sleeve 44 and a nozzle core 45; the annular step 41 is arranged on the body 42, and a rubber flow channel 421 is opened inside the body 1; the heater 43 is sleeved on the outside of the body 42; the sprue sleeve 44 is installed at the bottom of the body 42; the nozzle core 45 is arranged at the bottom of the body 42 and installed inside the sprue sleeve 44, and a glue outlet hole 451 connected to the rubber flow channel 421 is provided on the nozzle core 45. In actual application, the heater 43 heats the body 42 to keep the rubber in the rubber flow channel 421 in a hot melt state, and finally flows out through the glue outlet hole 451.
[0034] In this embodiment, the heater 43 includes a sleeve 431 and a heating wire 432. The sleeve 431 is made of copper and is sleeved on the body 42 and in close contact with the body 42. The heating wire 432 is arranged on the sleeve 431. In actual application, the sleeve 431 is heated by the heating wire 432. The sleeve 431 made of copper has strong thermal conductivity, which can not only ensure that the overall temperature of the sleeve 431 is uniform, but also quickly conduct heat to the body 42, thereby realizing rapid heating of the body 42.
[0035] Furthermore, a sheath 433 is provided on the outside of the sleeve 431, and the sheath 433 is made of steel. It should be understood that the copper sleeve 431 is susceptible to thermal expansion, and although the body 42 made of steel will also expand due to heat, the expansion amount is less than the expansion amount of the sleeve 431. In this way, as the temperature rises, a gap will be generated between the sleeve 431 and the body 42, thereby reducing the heat conduction efficiency and causing a temperature difference between the body 42 and the heater 43. To solve this problem, the present application adds a steel sheath 433, and the thermal expansion amount of the sheath 433 is also less than the thermal expansion amount of the sleeve 431. When the sleeve 431 is heated, it will not expand excessively because it is tightened by the sheath 433. In this way, the sleeve 431 and the body 42 are always kept in contact, thereby ensuring that the temperature of the heater 43 can be fully transmitted to the body 42, avoiding a significant temperature difference between the two.
[0036] In this embodiment, a temperature sensing line is provided outside the body 42, and the temperature sensing line is in contact with the body 42. With the above design, the temperature of the body 42 can be detected at all times to avoid the situation where the temperature of the body 42 is too low and the rubber solidifies.
[0037] In this embodiment, the bottom of the sprue sleeve 44 is provided with a guide ring 441 extending inwardly and obliquely, and the guide ring 441 is located below the glue outlet 451. In actual application, the guide ring 441 will protrude into the glue storage position 442, so that not only the space of the glue storage position 442 is reduced, the residence time of the glue in the glue storage position 442 is shortened, and the risk of plastic decomposition or discoloration is reduced, but also the heat of the sprue sleeve 44 can be better transferred to the plastic in the glue storage position 442, so that the plastic remains in a molten state, and the gate is prevented from being blocked by cold glue.
[0038] In this embodiment, the inner diameter of the guide ring 441 gradually decreases from top to bottom, and the angle between the inner wall surface and the horizontal plane is 40°-60°.
[0039] In this embodiment, the wall thickness of the guide ring 441 gradually decreases from top to bottom. With the above design, the structure of the guide ring 441 is more compatible with the structure of the glue storage position 442.
[0040] In this embodiment, the sprue bushing 44 and the body 42 are connected by heat fitting or cold fitting.
[0041] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A hot runner device with strong sealing performance, characterized in that: It includes a first template, a second template, a manifold, a hot nozzle, a heat insulation pad and an elastic pad, wherein: A containing cavity is provided in the middle of the second template; the diverter plate and the hot nozzle are both provided in the containing cavity, and the diverter plate is located above the hot nozzle and is in contact with the hot nozzle; the thermal insulation pad is provided above the diverter plate and is in contact with the diverter plate; an outwardly protruding annular step is provided on the top of the hot nozzle, and a flange is provided on the outer sleeve of the hot nozzle, and the flange abuts on the second template, and the elastic pad is provided between the annular step and the flange, and the two ends are respectively in contact with the annular step and the flange; the first template is provided above the second template and is in contact with the thermal insulation pad.
2. A hot runner device with strong sealing performance according to claim 1, characterized in that: The elastic pad is composed of a plurality of elastic sheets which are stacked.
3. A hot runner device with strong sealing performance according to claim 1, characterized in that: The hot nozzle includes a body, a heater, a sprue sleeve and a nozzle core; the annular step is arranged on the body, and a rubber flow channel is opened inside the body; the heater sleeve is arranged outside the body; the sprue sleeve is installed at the bottom of the body; the nozzle core is arranged at the bottom of the body and installed inside the sprue sleeve, and the nozzle core is provided with a glue outlet hole connected to the rubber flow channel.
4. A hot runner device with strong sealing performance according to claim 3, characterized in that: The heater comprises a sleeve and a heating wire. The sleeve is made of copper material and is sleeved on the body and in close contact with the body. The heating wire is arranged on the sleeve.
5. A hot runner device with strong sealing performance according to claim 4, characterized in that: A sheath is arranged outside the sleeve, and the sheath is made of steel.
6. A hot runner device with strong sealing performance according to claim 3, characterized in that: A temperature sensing wire is arranged outside the main body, and the temperature sensing wire is in contact with the main body.
7. A hot runner device with strong sealing performance according to claim 3, characterized in that: A guide ring extending inwardly and obliquely is provided at the bottom of the sprue sleeve, and the guide ring is located below the glue outlet hole.
8. A hot runner device with strong sealing performance according to claim 7, characterized in that: The inner diameter of the guide ring gradually decreases from top to bottom, and the angle between the inner wall surface and the horizontal plane is 40°-60°.
9. A hot runner device with strong sealing performance according to claim 7, characterized in that: The wall thickness of the guide ring gradually decreases from top to bottom.