Large-scale inverted high-light spray-free grating injection mold

Abstract

The application discloses a large-scale inverted high-light spray-free grid injection mold, and belongs to the technical field of injection molds, and has the technical scheme as follows: the injection mold comprises a front mold mechanism and a rear mold mechanism, the front mold mechanism is provided with a first base plate, a fixed front base, a first mold base, a hot glue channel structure, a jacking device and a vacuum pumping device, the rear mold mechanism is provided with a second base plate, a fixed rear base and a second mold base, positioning lugs are inserted into positioning grooves to form complete product cavities when the front mold and the rear mold are combined, the hot glue channel structure feeds glue to 19 glue feeding points through a plurality of injection tubes, and a control module adjusts the air flow value of the vacuum pumping device according to the injection condition, so that the injection mold is accurately combined, the injection pressure and flow are controllable, the cavity temperature is uniform, and air pumping is rapid, thereby guaranteeing the quality and production efficiency of injection products.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to a large inverted high-gloss paint-free grid injection mold. Background Technology

[0002] In the field of injection molds, with the booming development of industrial manufacturing, especially the continuous progress of industries such as automobiles, home appliances, and aerospace, the demand for large injection molds is showing an increasing trend. Large injection molds play a crucial role in product production across various industries due to their ability to efficiently and precisely manufacture large products. Taking the automotive industry as an example, automotive design aesthetics are constantly evolving, and luxury models have extremely high requirements for grille appearance, demanding a mirror-like finish, free of weld lines and orange peel texture.

[0003] Before the advent of large-scale inverted high-gloss paint-free grid injection molds, the following methods were commonly used to solve the problem of grid injection molding. One method involved using a simple mold structure, with the front and rear molds connected by a common connection method. The product cavity was formed by a single mold cavity surface, and the placement of injection points was rather arbitrary, possibly with only a few injection points in certain parts of the mold. The arrangement of injection tubes also lacked a systematic approach. During demolding, a single ejection device was often used, relying on mechanical force to eject the product from the mold.

[0004] However, for the production of molds for large high-gloss grilles (large high-gloss grille specifications 1473×395×258mm, mold specifications 3450×1680×1661.5mm), conventional mold structures lack precise positioning and fit during mold closing, resulting in inaccurate product cavity molding and affecting product quality. Inappropriate injection point placement leads to uneven material flow during injection molding, easily causing problems such as bubbles and shrinkage marks. Complex grilles often employ multi-gate designs, which easily form weld lines at melt junctions, resulting in poor consistency. Inaccurate mold temperature control cannot guarantee uniform surface temperature of the cavity, leading to deformation and other problems during the molding process. Summary of the Invention

[0005] In order to ensure precise mold closing, controllable injection pressure and flow, uniform cavity temperature, and rapid evacuation, thereby guaranteeing the quality of injection molded products and production efficiency, this invention provides a large inverted high-gloss paint-free grid injection mold.

[0006] The present invention provides a large inverted high-gloss paint-free grid injection mold with the following technical solution:

[0007] A large inverted high-gloss paint-free grid injection mold includes a front mold mechanism and a rear mold mechanism;

[0008] The front mold mechanism includes a first base plate, a fixed front base and a first mold base. The fixed front base is connected to the first base plate and the first mold base is connected to the fixed front base. The first mold base has a first mold cavity and a positioning protrusion.

[0009] The rear mold mechanism includes a second base plate, a fixed rear base, and a second mold base. The fixed rear base is connected to the second base plate, and the second mold base is connected to the fixed rear base. The second mold base has a second mold cavity and a positioning groove that matches the positioning protrusion.

[0010] When the front mold mechanism and the rear mold mechanism are closed, the positioning protrusion is inserted into the positioning groove, and the first mold cavity and the second mold cavity cooperate to form a complete product cavity;

[0011] The front mold mechanism also includes a hot runner structure, which includes a wiring frame, a glue flow channel, and multiple injection tubes. The wiring frame is connected to the first substrate, the glue flow channel is connected to the wiring frame, and the multiple injection tubes are all connected to the glue flow channel. The product cavity has nineteen injection points, including ten side injection points and nine straight injection points, arranged in a set position. The glue flow channel has an inlet. A coordinate system is established with the center of the inlet as the origin, the length direction of the first mold base as the X-axis, and the width direction as the Y-axis. The center coordinates of the outlets of the nineteen injection points are (0, 76), (-273, 37), (273, 37), (-508.27, -31.26), (508.27), and (508.27), respectively. The values ​​are: (-31.26), (34.5, -93.5), (1, -186), (-455, -246), (455, 246), (-211, 246.5), (-425, 243.5), (-270.92, 86.65), (-254, -246), (-640, -246), (211, 246.5), (425, 243.5), (270.92, 86.65), (254, 246), (640, 246), all in mm. The injection time of each injection point is set based on its distance from the origin. Injection points closer to the origin have earlier injection times. Each injection point is connected to an injection tube.

[0012] The front mold mechanism also includes a lifting device for product demolding and a vacuum device for evacuating air into the product cavity. The vacuum device is electrically connected to a control module, which is configured to control the evacuation time of the vacuum device to within 2 seconds.

[0013] The injection tube is connected to a pressure sensor and a flow meter for detecting injection pressure. Both the pressure sensor and the flow meter are electrically connected to the control module. The control module is configured to automatically adjust the vacuuming flow rate of the vacuuming device according to the filling speed, flow rate, and injection pressure of each injection tube.

[0014] Both the front mold mechanism and the rear mold mechanism are connected to a temperature control device for controlling the temperature of the product cavity, so as to make the surface temperature of the cavity uniform.

[0015] Both the front mold mechanism and the rear mold mechanism are connected to an integrated energy board, which has several interfaces for providing energy to each component.

[0016] By adopting the above technical solution, the front mold mechanism and the rear mold mechanism cooperate, and the positioning protrusion matches the positioning groove to ensure accurate mold closing, forming a complete product cavity and ensuring product molding accuracy. Multiple injection tubes in the hot runner structure inject the material into the product cavity through nineteen arranged injection points, ensuring uniform material injection. Hot nozzle inserts cool the injection tube outlets to prevent overheating of the material, reducing problems such as bubbles and shrinkage marks, and avoiding weld lines at the junction of complex grid melts. When the hot nozzles inject material sequentially, the injection pressure changes. At this moment, as the filling material enters the product cavity, the total volume of the product cavity changes. The control module automatically adjusts the vacuum device's air extraction flow rate value based on the filling speed, flow rate, and injection pressure detected by the pressure sensor and flow meter. The purpose is to ensure stable and rapid filling inside the product cavity, avoiding injection defects caused by short strokes, trapped air, or stagnant flow. Simultaneously, the control module must control the vacuum device to complete evacuation within 2 seconds, thereby ensuring high-quality injection molding of the product's surface (A). The temperature control device ensures uniform surface temperature of the mold cavity, guaranteeing product quality. The integrated energy board provides energy to all components, facilitating overall mold operation. The lifting device is used for product demolding. The injection method with nineteen injection points at specific coordinates allows for optimized injection timing based on the distance between the injection point and the origin, ensuring more orderly entry of the molten plastic into the product cavity. This results in more uniform and accurate entry of the molten plastic, reducing injection defects and improving the injection quality of large inverted high-gloss paint-free grids. The system integrates multiple functions, including front and rear mold mechanisms forming a complete product cavity, a hot runner structure for plastic delivery, a lifting device for demolding, a vacuum device for air extraction, a control module for parameter adjustment, a temperature control device for uniform surface temperature of the mold cavity, and an integrated energy board for energy supply.

[0017] Preferably, the mold closing clearance between the front mold mechanism and the rear mold mechanism is no greater than 0.01 mm.

[0018] By adopting the above technical solutions, the accuracy of mold closing can be significantly improved, the possibility of plastic overflow during injection molding can be reduced, and the molding quality and dimensional accuracy of the product can be guaranteed; at the same time, it can support the operation of the vacuum device.

[0019] Preferably, the vacuuming device includes multiple vacuum pumps, a vacuum branch pipe, a manifold, a suction pipe, and multiple air passage top blocks. The multiple vacuum pumps are all fixedly connected to the first mold base. Each vacuum pump is connected to the vacuum branch pipe. The vacuum branch pipe is connected to the manifold, and the manifold is connected to the suction pipe.

[0020] Multiple air passage top blocks are respectively located at both ends of the first mold cavity along its length, and the air passage top blocks constitute part of the first mold cavity; multiple air intake ports are provided on the air intake pipe, and air grooves are opened on the side walls of the air passage top blocks. The air grooves are used to connect the corresponding air intake ports with the product cavity, and the depth of the air grooves is 0.02mm.

[0021] By adopting the above technical solution, during the injection molding process, multiple vacuum pumps fixedly connected to the first mold base are activated. Gas is drawn out of the product cavity through the 0.02mm deep air grooves on the side wall of the air channel top block, the air suction port of the suction pipe, and sequentially through the extraction branch pipe, the manifold, and the suction pipe. Multiple air channel top blocks are located at both ends of the first mold cavity along its length, enabling efficient extraction from both ends of the product cavity, ensuring effective extraction, and thus effectively removing gas from the product cavity, improving the quality of the injection-molded product. Furthermore, the air channel top blocks being located at both ends of the first mold cavity and connected to the suction port by air grooves of a specific width ensures efficient and uniform extraction without affecting the product, and contributes to improving the product molding quality.

[0022] Preferably, the device further includes a guide positioning device, which includes a positioning rod, a fixed shaft, and a bearing. The first mold base has a positioning slot and a mounting slot. The positioning slot matches the positioning rod, and the mounting slot communicates with the positioning slot. The fixed shaft and the bearing are located in the mounting slot. The fixed shaft is fixedly connected to the first mold base, and the inner wall of the bearing is fixedly connected to the fixed shaft. The outer wall of the bearing protrudes from the mounting slot. When the first mold base and the second mold base are closed, the positioning rod is inserted into the positioning slot and abuts against the bearing.

[0023] By adopting the above technical solution, the guide positioning device can achieve precise positioning when the first mold base and the second mold base are closed. The bearing reduces the frictional resistance when the positioning rod is inserted into the positioning slot, making the mold closing process smoother.

[0024] Preferably, the rear mold mechanism further includes an active demolding device, which includes an elastic component and an elastic block structure;

[0025] The spring block structure includes a first spring block, a second spring block, a third spring block, a fourth spring block, a fifth spring block, and a sixth spring block. The first spring block and the fourth spring block are symmetrically arranged, the second spring block and the fifth spring block are symmetrically arranged, and the third spring block and the sixth spring block are symmetrically arranged. The second spring block is located between the first spring block and the third spring block, and the fifth spring block is located between the fourth spring block and the sixth spring block. The first spring block and the third spring block are each connected to one side glue inlet point, and the second spring block and the fourth spring block are each connected to four side glue inlets points.

[0026] The first, second, third, fourth, fifth, and sixth elastic blocks constitute part of the second mold cavity, and each elastic block is provided with a slot for forming a grid buckle.

[0027] The first, second, third, fourth, fifth, and sixth spring blocks are all connected to the elastic component. The elastic component is connected to the fixed base and is used to tilt the corresponding spring blocks, which tilt from one end of the fixed base to the other in a direction away from each other.

[0028] By adopting the above technical solution, the elastic component of the active demolding device is inclined and connected to the fixed base. When the mold opens, the elastic component generates elastic force, driving the first, second, third, fourth, fifth, and sixth elastic blocks connected to it to move away from each other, thus achieving active demolding and improving production efficiency. The symmetrical arrangement of each elastic block in the elastic block structure ensures the molding accuracy of the product; the slots opened on each elastic block can be used for molding grid fastening, simplifying the production process; the side inlet channel is opened on the elastic block structure, allowing the rubber material to smoothly enter the second mold cavity through the side inlet channel, improving product quality.

[0029] Preferably, the lifting device includes a lifting cylinder, a lifting plate, lifting rods, and lifting blocks. The lifting cylinder is fixedly connected to the side wall of the first mold base. The lifting plate is disposed between the first mold base and the fixed front base. The first mold base has a movable groove for the lifting plate to move. The lifting plate is disposed in the movable groove. The side wall of the lifting plate has a protruding plate that extends through the first mold base to the outside. The drive shaft of the lifting cylinder is fixedly connected to the protruding plate. Multiple lifting rods are provided, all of which are connected to the lifting plate. Multiple lifting blocks are provided and evenly distributed on the first mold base. The lifting blocks are fixedly connected to the lifting rods. The lifting blocks are all used to form components of the first mold cavity.

[0030] By adopting the above technical solution, the lifting cylinder drives the lifting plate, which in turn moves the lifting rod and the lifting block, thus enabling the product to be demolded smoothly. The lifting block, as a component of the first mold cavity, ensures the integrity of the product molding.

[0031] Preferably, the temperature control device comprises multiple sets of water pipes, each connected to a water source, with a distance of 25mm between the water pipe and the corresponding product cavity surface, a diameter of 15mm, and a spacing of 80mm between adjacent water pipes.

[0032] By adopting the above technical solution, multiple sets of water pipes are connected to the water source as a temperature control device. The distance between the water pipes and the product cavity surface is 25mm, the diameter is 15mm, and the adjacent spacing is 80mm. This uniform and orderly distribution can effectively make the cavity surface temperature uniform and ensure the injection effect of large inverted high-gloss paint-free grid injection mold.

[0033] Preferably, the first mold base is connected to a mold cavity temperature sensor, the mold cavity temperature sensor is electrically connected to the control module, and the control module is electrically connected to the temperature control device.

[0034] By adopting the above technical solution, the mold cavity temperature sensor can detect the temperature of the surface of the first mold cavity in real time and transmit the signal to the control module. The control module controls the temperature control device to adjust the temperature of the product cavity according to the temperature signal, so as to ensure the precise control and stability of the product cavity temperature and improve the quality and molding effect of injection molded products.

[0035] Preferably, both the first mold base and the second mold base are equipped with a mold plate temperature sensor, and the probe of the mold plate temperature sensor is inserted to a depth of 200mm.

[0036] By adopting the above technical solution, the temperature deep inside the mold can be accurately measured, providing precise data for temperature control of the product cavity. This helps to control the product cavity temperature more accurately, making the cavity surface temperature uniform and ensuring the quality of injection molded products.

[0037] In summary, the present invention has the following beneficial effects:

[0038] The front and rear mold mechanisms work together, with positioning protrusions matching positioning grooves to ensure accurate mold closing, forming a complete product cavity and guaranteeing product molding precision. Multiple injection tubes in the hot runner structure inject material into the product cavity through nineteen arranged injection points, ensuring uniform material flow. Hot nozzle inserts cool the injection tube outlets, preventing overheating of the material and reducing issues such as bubbles and shrinkage marks, while avoiding weld lines at the junctions of complex grid melts. As the hot nozzles sequentially fill the cavity, the injection pressure changes. This changes the overall volume of the product cavity. The control module automatically adjusts the vacuum device's suction flow rate based on the filling speed, flow rate, and injection pressure detected by pressure sensors and flow meters. This ensures stable and rapid filling within the product cavity, preventing injection defects caused by short strokes, trapped air, or stagnant flow. Simultaneously, the control module ensures the vacuum device completes evacuation within 2 seconds, guaranteeing high-quality injection molding on surface A of the product. The temperature control device ensures uniform surface temperature of the mold cavity, guaranteeing product quality; the integrated energy plate provides energy to all components, facilitating overall mold operation. The lifting device is used for product demolding. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the front mold mechanism of a large inverted high-gloss paint-free grid injection mold.

[0040] Figure 2 This is a schematic diagram of the rear mold mechanism of a large inverted high-gloss paint-free grid injection mold.

[0041] Figure 3 This is a structural diagram of the temperature control device.

[0042] Figure 4 This is a front view of the hot glue channel structure.

[0043] Figure 5 It refers to the location of the side-entry glue point and the straight-entry glue point.

[0044] Figure 6 This is a schematic diagram of the hot glue channel structure.

[0045] Figure 7 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0046] Figure 8 This is a schematic diagram of the vacuum pumping device.

[0047] Figure 9 yes Figure 8 Enlarged diagram of part B.

[0048] Figure 10 yes Figure 9 An enlarged schematic diagram of section C.

[0049] Figure 11 yes Figure 1 An enlarged schematic diagram of part D in the middle.

[0050] Figure 12 This is a diagram showing the location of the temperature sensor on the template.

[0051] Figure 13 This is a schematic diagram showing the positions of each spring block in the spring block structure.

[0052] Figure 14 yes Figure 13 An enlarged schematic diagram of section E in the middle.

[0053] Figure 15 yes Figure 1 Enlarged schematic diagram of section F in the middle.

[0054] Figure 16 This is a schematic diagram showing the location of the lifting device.

[0055] Figure 17 yes Figure 16 An enlarged schematic diagram of section G in the middle.

[0056] Figure 18 yes Figure 13 An enlarged schematic diagram of section H in the middle.

[0057] Figure 19 This is a schematic diagram of the integrated energy panel.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1. Front mold mechanism; 11. First base plate; 12. Fixed front base; 13. First mold base; 131. First mold cavity; 132. Positioning protrusion; 133. Positioning slot; 134. Mounting slot; 135. Movable slot; 14. Hot runner structure; 141. Cable routing frame; 142. Glue runner; 143. Injection tube; 1431. Side inlet runner; 1432. Side inlet nozzle; 1433. Straight inlet nozzle 15. Hot nozzle insert; 16. Lifting device; 161. Lifting cylinder; 162. Lifting plate; 163. Lifting rod; 164. Lifting block; 165. Protective shell; 17. Mold cavity temperature sensor; 18. Vacuuming device; 181. Vacuum pump; 182. Suction branch pipe; 183. Manifold; 184. Suction pipe; 185. Air passage block; 1851. Air groove; 1852. Air passage.

[0060] 2. Rear mold mechanism; 21. Second base plate; 22. Fixed rear base; 23. Second mold base; 231. Second mold cavity; 232. Positioning groove; 24. Active demolding device; 241. Elastic component; 2411. Guide rod; 2412. Guide sleeve; 2413. Spring; 242. Elastic block structure; 2421. First elastic block; 2422. Second elastic block; 2423. Third elastic block; 2424. Fourth elastic block; 2425. Fifth elastic block; 2426. Sixth elastic block;

[0061] 3. Temperature control device; 31. Water pipe; 4. Template temperature sensor; 5. Integrated energy board; 51. Oil connector; 52. Electrical connector; 53. Steam connector; 54. Water connector; 6. Guide and positioning device; 61. Positioning rod; 62. Fixed shaft; 63. Bearing; 7. Limit switch; 71. Bracket; 72. First contact; 73. Second contact; 74. First protrusion; 75. Second protrusion; 76. Third protrusion; 77. Locking plate; 771. First locking hole; 772. Second locking hole; 773. Third locking hole. Detailed Implementation

[0062] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0063] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0064] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0065] A large inverted high-gloss paint-free grid injection mold, referenced Figure 1 and Figure 2It includes a front mold mechanism 1 and a rear mold mechanism 2, both of which are installed on a 2700T injection molding machine. The front mold mechanism 1 is fixed to the injection molding machine, and the rear mold mechanism 2 serves as the moving mold.

[0066] Reference Figures 1 to 4 When the front mold mechanism 1 and the rear mold mechanism 2 are closed, they can precisely cooperate to form a complete product cavity, and the clearance between the front mold mechanism and the rear mold mechanism is no greater than 0.01mm. The front mold mechanism 1 includes a hot runner structure 14, a lifting device 16, and a vacuum device 18. The vacuum device 18 is electrically connected to a control module, which is configured to control the vacuuming time of the vacuum device 18 to within 2 seconds. In other words, when the vacuum device 18 evacuates the product cavity, it can reduce the air in the product cavity to a preset range within 2 seconds. The hot runner structure 14 includes a pressure sensor and a flow meter for detecting injection pressure. Both the pressure sensor and the flow meter are electrically connected to the control module, which is configured to automatically adjust the vacuuming flow rate of the vacuum device 18 according to the filling speed, flow rate, and injection pressure of each injection tube 143. Both the front mold mechanism 1 and the rear mold mechanism 2 are connected to a temperature control device 3 for controlling the temperature of the product cavity to ensure uniform surface temperature of the cavity. Both the front mold mechanism 1 and the rear mold mechanism 2 are connected to an integrated energy board 5. The integrated energy board 5 is connected to several interfaces for providing energy to various components.

[0067] The hot glue channel structure 14, lifting device 16, vacuum device 18, temperature control device 3, and control module work together to ensure the molding quality of the product, improve production efficiency, and solve the problems of conventional molds in mold closing positioning, glue injection, demolding, and temperature control.

[0068] Reference Figure 1 The front mold mechanism 1 includes a first base plate 11, a fixed front base 12, and a first mold base 13. The first base plate 11 is the fundamental support component of the entire front mold mechanism 1, typically made of high-strength metal materials such as alloy steel. It is rectangular and flat, possessing good stability and load-bearing capacity. The fixed front base 12 is firmly connected to the first base plate 11 by bolts or other means, serving to connect the first base plate 11 and the first mold base 13. It is generally manufactured using casting processes and possesses suitable strength and rigidity. The first mold base 13 is fixedly connected to the fixed front base 12 and has a first mold cavity 131. The shape of this cavity is precisely machined according to the design requirements of the grille product, and its surface undergoes fine polishing to ensure the surface quality of the product.

[0069] Reference Figure 1 and Figure 2The rear mold mechanism 2 includes a second base plate 21, a fixed rear base 22, and a second mold base 23. The second base plate 21 is also made of high-strength metal material, providing stable support for the rear mold mechanism 2. The fixed rear base 22 is fixedly connected to the second base plate 21, and the connection method is similar to that of the front mold mechanism 1. The second mold base 23 is fixedly connected to the fixed rear base 22, and has a second mold cavity 231, which corresponds to the first mold cavity 131. Heat insulation plates are fixedly connected to the outer periphery of both the first mold base 13 and the second mold base 23 to prevent personnel from being burned.

[0070] Reference Figure 1 and Figure 2 The first mold base 13 has positioning protrusions 132 at both ends along its length, and the positioning protrusions 132 are integrally formed with the first mold base 13. The second mold base 23 has positioning grooves 232, the shape of which matches the positioning protrusions 132. The grooves 232 require high dimensional accuracy to ensure precise positioning during mold closing. When the front mold mechanism 1 and the rear mold mechanism 2 close, the positioning protrusions 132 and the positioning grooves 232 precisely engage.

[0071] Reference Figure 1 and Figure 2 The first mold cavity 131 has recesses on both sides along its length, and the second mold cavity 231 has protrusions on both sides, with the protrusions and recesses fitting precisely together. Positioning protrusions 132 are located on the outside of the recesses, and positioning grooves 232 are located on the outside of the protrusions to further improve the precise positioning of the first mold base 13 and the second mold base 23.

[0072] Reference Figure 1 and Figure 4 The hot runner structure 14 includes a wiring frame 141, a glue flow channel 142, and multiple injection tubes 143. The wiring frame 141 is a rectangular metal frame fixedly connected to the first substrate 11. The wiring frame 141 houses electrical wires and also provides a mounting and support structure for the glue flow channel 142 and injection tubes 143. The glue flow channel 142, fixedly connected to the wiring frame 141, guides the flow of the glue material; its inner wall is smooth to reduce resistance to the flow. The glue flow channel 142 is fixedly connected to a glue inlet for injection molding. Multiple injection tubes 143 are all fixedly connected to the glue flow channel 142.

[0073] Reference Figure 1 , Figure 4 and Figure 5The product cavity has nineteen injection points, including ten side injection points 1432 and nine straight injection points 1433, evenly arranged in designated positions. The glue flow channel 142 has an injection port. A coordinate system is established with the center of the injection port as the origin, the length direction of the first mold base 13 as the X-axis, and the width direction as the Y-axis. The center coordinates of the outlets of the ten side injection points 1432 are (-455, -246), (455, -246), (-211, 246.5), (-425, 243.5), (-254, -246), (-640, -246), (211, 246.5), (425, 243.5), (254, -246), ( ... 46); The center coordinates of the outlets of the nine straight-in glue points 1433 are (0, 76), (-273, 37), (273, 37), (-508.27, -31.26), (508.27, -31.26), (34.5, -93.5), (1, -186), (-270.92, -86.65), (270.92, -86.65); the units are mm. The glue injection time of each glue point is set based on its distance from the origin. The closer the glue point is to the origin, the earlier its glue injection time.

[0074] The rational arrangement of the injection points ensures that the rubber material can evenly fill the product cavity during injection molding, avoiding problems such as air bubbles and shrinkage marks. Each injection point is connected to an injection tube 143. Among the nineteen injection tubes 143, the pressure is highest near the origin and decreases with increasing distance from the origin.

[0075] During the glue injection process, the following synchronization steps were followed: (0, 76), (34.5, -93.5), (1, -186), (-211, 246.5) and (211, 246.5) synchronously, (-270.92, 86.65) and (270.92, 86.65) synchronously, (-254, -246) and (254, -246) synchronously, and (-273, 37) and (273, 37) synchronously. The glue is injected in the following order: (-425, 243.5) and (425, 243.5) synchronous, (-455, -246) and (455, -246) synchronous, (-508.27, -31.26) and (508.27, -31.26) synchronous, and (-640, -246) and (640, -246) synchronous. The flow rate of the glue is controlled in real time by the control module.

[0076] Reference Figure 5 and Figure 6Each injection nozzle 1433 has a corresponding hot runner insert 15 connected to the outlet of the injection tube 143. The hot runner insert 15 is generally made of a material with good thermal conductivity, such as copper alloy. It can cool the outlet of the injection tube 143 to prevent the rubber from overheating at the outlet and affecting the injection molding quality. The hot runner insert 15 includes a housing and a water supply pipe. The housing is fitted onto the injection tube 143 and fixedly connected to the mold base. The housing is connected to a water supply pipe and an output pipe. The water supply pipe is connected to a water source to keep the water temperature inside the housing stable.

[0077] Reference Figure 5 , Figure 6 and Figure 7 Each side injection point 1432 corresponds to a side injection channel 1431, which communicates with the product cavity. The outlet end of the injection tube 143 is connected to the side injection channel 1431. The side injection channel 1431 includes a gate section, a rear extension section, and a front injection section. The extension section and the front injection section are respectively located on both sides of the gate section and are both connected to the gate section. The front injection section is connected to the product cavity.

[0078] Reference Figure 1 and Figure 8 The vacuum pumping device 18 includes a vacuum pump 181, a suction branch pipe 182, a manifold pipe 183, a suction pipe 184, and a top block 185. Four vacuum pumps 181 are provided, all fixedly connected to the first mold base 13. The vacuum pumps 181 are the core components of the vacuum pumping device 18, used to generate vacuum suction. Each vacuum pump 181 is fixedly connected to a suction branch pipe 182, which communicates with the manifold pipe 183, and the manifold pipe 183 communicates with the suction pipe 184.

[0079] Reference Figure 1 , Figures 8 to 10 Four air passage top blocks 185 are provided, located at both ends of the first mold cavity 131 along its length, and the air passage top blocks 185 are part of the first mold cavity 131. Air passages 1852 are formed around the air passage top blocks 185, and air grooves 1851 are formed on the side walls of the air passage top blocks 185. The air grooves 1851 are used to connect the corresponding air passages 1852 to the product cavity, and the depth of the air grooves 1851 is 0.02 mm. Multiple air suction ports are provided on the suction pipe 184, corresponding to and connected to the air passages 1852 of the four air passage top blocks 185.

[0080] Reference Figure 6 and Figure 8The vacuum pump 181 is electrically connected to the control module, which is configured to control the evacuation time of the vacuum pump 181 to within 2 seconds. The injection tube 143 is fixedly connected to a pressure sensor and a flow meter for detecting injection pressure. Both the pressure sensor and the flow meter are electrically connected to the control module, which is configured to automatically adjust the evacuation flow rate of the vacuum device 18 based on the filling speed, flow rate, and injection pressure of each injection tube 143. In this way, a suitable vacuum level in the product cavity can be ensured during the injection molding process, avoiding problems such as air bubbles.

[0081] Reference Figure 1 , Figure 3 and Figure 11 The temperature control device 3 consists of multiple sets of water pipes 31, each connected to a water source. The distance between each water pipe 31 and the corresponding product cavity surface is 25mm, the diameter of each water pipe 31 is 15mm, and the spacing between adjacent water pipes 31 is 80mm. A mold cavity temperature sensor 17 is connected to the first mold base 13, and the mold cavity temperature sensor 17 is part of the first mold cavity 131. The mold cavity temperature sensor 17 is electrically connected to the control module, and the control module is electrically connected to the temperature control device 3.

[0082] Reference Figure 3 , Figures 12 to 14 The first mold base 13 and the second mold base 23 are both equipped with mold plate temperature sensors 4, and the probe of the mold plate temperature sensor 4 is inserted to a depth of 200mm.

[0083] These temperature sensors and temperature control devices 3 can precisely control the temperature of the product cavity, ensure uniform temperature on the cavity surface, and prevent problems such as product deformation during the molding process.

[0084] Reference Figure 1 , Figure 2 and Figure 15 It also includes a guide positioning device 6, which includes a positioning rod 61, a fixed shaft 62, and a bearing 63. Four positioning rods 61 are provided, and each is fixedly connected to one of the four side walls of the second mold base 23. Each of the four side walls of the first mold base 13 has a positioning slot 133, which matches the positioning rod 61. When the mold is closed, the positioning rod 61 is inserted into the positioning slot 133.

[0085] Reference Figure 1 , Figure 2 and Figure 15The first mold base 13 has mounting grooves 134 on both side walls along its length. These mounting grooves 134 are located adjacent to and communicate with the positioning slots 133. During actual use of the front mold mechanism 1 and the rear mold mechanism 2, the mounting grooves 134 are located at the bottom of the corresponding positioning slots 133. A fixed shaft 62 and a bearing 63 form a guide assembly, with two sets of guide assemblies located within the two mounting grooves 134. The fixed shaft 62 is fixedly connected to the first mold base 13, and the inner wall of the bearing 63 is fixedly connected to the fixed shaft 62. The outer wall of the bearing 63 protrudes from the mounting groove 134 and extends into the positioning slot 133. When the first mold base 13 and the second mold base 23 are closed, the positioning rod 61 is inserted into the positioning slot 133 and abuts against the bearing 63.

[0086] The guide positioning device 6 enables the front mold mechanism 1 and the rear mold mechanism 2 to be positioned more accurately during the mold closing process. Through the cooperation of the positioning rod 61 and the bearing 63, the friction and deviation during mold closing are reduced, the service life of the mold and the consistency of the product are improved, and the performance and advantages of the injection mold are further enhanced.

[0087] Reference Figure 1 , Figure 16 and Figure 17 The lifting device 16 includes lifting cylinders 161, lifting plates 162, lifting rods 163, lifting blocks 164, and protective shells 165. Four lifting cylinders 161 are symmetrically distributed on both sides of the length of the first mold base 13 and are fixedly connected to the side walls of the first mold base 13. The lifting cylinders 161 are the power source of the lifting device 16, providing driving force through a hydraulic system. The lifting plate 162 is located between the first mold base 13 and the fixed front base 12. The first mold base 13 has a movable groove 135 for the lifting plate 162 to move, allowing it to move up and down within the groove. Each of the four corners of the lifting plate 162 has a protruding plate that extends through the first mold base 13 to the outside. The first mold base 13 has a movable space for the protruding plates to move. Four protective shells 165 are provided, each covering the outside of one of the four protruding plates and blocking the movement space. The protective shells 165 are fixedly connected to the first mold base 13. Each of the four protective shells 165 corresponds to one of the four lifting cylinders 161. The drive shaft of each lifting cylinder 161 passes through the corresponding protective shell 165 and is fixedly connected to the protruding plate. When the lifting cylinder 161 operates, it drives the protruding plate to move via the drive shaft, thereby moving the lifting plate 162.

[0088] Reference Figure 1 , Figure 16 and Figure 17Multiple lifting rods 163 are provided, all of which are fixedly connected to the lifting plate 162. Multiple lifting blocks 164 are provided, evenly distributed on the first mold base 13, and are fixedly connected to the multiple lifting rods 163 respectively. The lifting blocks 164 are part of the first mold cavity 131, and the multiple lifting blocks 164 are evenly distributed on the first mold cavity 131. During demolding, the lifting cylinder 161 drives the lifting plate 162 to rise, and the lifting rods 163 drive the lifting blocks 164 to push the product out of the mold.

[0089] Reference Figure 2 , Figure 4 and Figure 7 The rear mold mechanism 2 also includes an active demolding device 24, which includes an elastic component 241 and an elastic block structure 242. The elastic block structure 242 is part of the second mold cavity 231, and the forward part of the side inlet channel 1431 is opened on the elastic block structure 242.

[0090] Reference Figure 4 and Figure 13 The spring block structure 242 includes a first spring block 2421, a second spring block 2422, a third spring block 2423, a fourth spring block 2424, a fifth spring block 2425, and a sixth spring block 2426. The first spring block 2421 and the fourth spring block 2424 are symmetrically arranged, the second spring block 2422 and the fifth spring block 2425 are symmetrically arranged, the third spring block 2423 and the sixth spring block 2426 are symmetrically arranged, and the second spring block 2422 is located between the first spring block 2421 and the third spring block 2423, and the fifth spring block 2425 is located between the fourth spring block 2424 and the sixth spring block 2426.

[0091] Reference Figure 4 , Figure 6 and Figure 13 The elastic component 241 includes guide rods 2411, guide sleeves 2412, and springs 2413. Two guide rods 2411 are fixedly connected to the bottom of each elastic block. The guide rods 2411 are inclined, tilting 10 degrees from one end near the fixed base 22 towards each other. A guide sleeve 2412 is fitted onto the guide rod 2411 and slidably connected to it. The guide sleeve 2412 is fixedly connected to the second mold base 23. Multiple springs 2413 are provided: one spring 2413 is connected to the bottom of the first elastic block 2421, the third elastic block 2423, the fourth elastic block 2424, and the sixth elastic block 2426; two springs 2413 are connected to the bottom of the second elastic block 2422 and the fifth elastic block 2425. The other end of each spring 2413 is fixedly connected to the fixed base 22.

[0092] Reference Figure 2 , Figures 4 to 6The first elastic block 2421 and the third elastic block 2423 are each connected to one side glue inlet 1432, and the second elastic block 2422 and the fourth elastic block 2424 are each connected to four side glue inlets 1432. The first elastic block 2421, the second elastic block 2422, the third elastic block 2423, the fourth elastic block 2424, the fifth elastic block 2425 and the sixth elastic block 2426 constitute part of the second mold cavity 231, and each elastic block is provided with a slot for the forming grid to be fastened.

[0093] The active demolding device 24, through the cooperation of the elastic component 241 and the spring block structure 242, can actively apply force during demolding, making it easier for the product to be removed from the mold. This avoids the damage that a single demolding method might cause to the product, and is especially suitable for demolding complex grid products, improving the product's appearance and performance. It represents an innovation and improvement in demolding technology. The guide rod 2411 has an inclination angle of 10 degrees, which can provide appropriate demolding force during the demolding process to prevent product damage.

[0094] Reference Figure 1 , Figure 2 and Figure 18 The system also includes a limit switch 7, which comprises a bracket 71, a first contact 72, a second contact 73, a first protrusion 74, a second protrusion 75, a third protrusion 76, and a locking plate 77. The first contact 72 and the second contact 73 are both fixedly connected to the bracket 71, and are spaced apart. The bracket 71 is fixedly connected to the second mold base 23. The second protrusion 75 is fixedly connected to the first mold base 13, and the first protrusion 74 and the third protrusion 76 are both fixedly connected to the second mold base 23. The locking plate 77 has a first locking hole 771, a second locking hole 772, and a third locking hole 773. When the first contact 72 senses the locking plate 77 and the second contact 73 does not sense the locking plate 77, the locking plate 77 is simultaneously fitted onto the first protrusion 74 and the second protrusion 75. The first protrusion 74 is engaged with the first locking hole 771, and the second protrusion 75 is engaged with the second locking hole 772. At this time, the front mold mechanism 1 and the rear mold mechanism 2 are in the mold-closed state. When the first contact 72 does not sense the locking plate 77 but the second contact 73 senses the locking plate 77, the locking plate 77 is simultaneously fitted onto the first protrusion 74 and the third protrusion 76. The first protrusion 74 is engaged with the first locking hole 771, and the third protrusion 76 is engaged with the third locking hole 773. At this time, the front mold mechanism 1 and the rear mold mechanism 2 are in the mold-opening or about-to-open state. The limit switch 7 is used to monitor the mold opening and closing state, which facilitates the determination of whether the injection molding machine has stopped injection. The position of the locking plate 77 needs to be adjusted by the operator. Both the first contact 72 and the second contact 73 can be magnetic induction sensors.

[0095] Reference Figure 1 , Figure 2 and Figure 19Both the front mold mechanism 1 and the rear mold mechanism 2 are connected to an integrated energy plate 5. The integrated energy plate 5 is fixedly connected to several interfaces such as oil connector 51, electric connector 52, water connector 54 and steam connector 53. The integrated energy plate 5 is also connected to an oil station, power supply, water source and steam source, which can centrally provide the required oil, power supply, water and steam to the mold components, making it convenient for the mold components to obtain energy and connect, and improving the energy supply and connection convenience of the mold.

[0096] The implementation principle of this embodiment is as follows: The large inverted high-gloss paint-free grid injection mold, through the precise positioning and cooperation of the front mold mechanism 1 and the rear mold mechanism 2, utilizes the hot glue channel structure 14 to reasonably set nineteen glue injection points, ensuring uniform filling of the glue material; safe and reliable demolding is achieved through the lifting device 16 and the active demolding device 24; the coordinated work of the vacuum device 18 and the control module accelerates the flow rate of the glue, and combined with the cooperation of the temperature control device 3, the product cavity temperature is kept stable, solving problems such as bubbles and deformation in the product molding process, improving product quality and production efficiency, and has significant advantages compared with conventional scale, which is an important improvement to existing injection mold technology.

[0097] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A large inverted high-gloss paint-free grid injection mold, characterized in that: It includes a front mold mechanism (1) and a rear mold mechanism (2) for fixing to the injection molding machine; The front mold mechanism (1) includes a first base plate (11), a fixed front base (12) and a first mold base (13). The fixed front base (12) is connected to the first base plate (11), and the first mold base (13) is connected to the fixed front base (12). The first mold base (13) has a first mold cavity (131) and a positioning protrusion (132). The rear mold mechanism (2) includes a second base plate (21), a fixed rear base (22), and a second mold base (23). The fixed rear base (22) is connected to the second base plate (21), and the second mold base (23) is connected to the fixed rear base (22). The second mold base (23) has a second mold cavity (231) and a positioning groove (232) that matches the positioning protrusion (132). When the front mold mechanism (1) and the rear mold mechanism (2) are closed, the positioning protrusion (132) is inserted into the positioning groove (232), and the first mold cavity (131) and the second mold cavity (231) cooperate to form a complete product cavity; The front mold mechanism (1) further includes a hot runner structure (14), which includes a wiring frame (141), a glue runner (142), and multiple injection tubes (143). The wiring frame (141) is connected to the first substrate (11), the glue runner (142) is connected to the wiring frame (141), and the multiple injection tubes (143) are all connected to the glue runner (142). The product cavity has nineteen glue inlet points, including ten side glue inlet points (1432) and nine straight glue inlet points (1433), which are arranged in a set position. The glue runner (142) has a glue inlet. A coordinate system is established with the center of the glue inlet as the origin, the length direction of the first mold base (13) as the X-axis, and the width direction as the Y-axis. The center coordinates of the outlets of the nineteen glue inlet points are (0, 76) and (-273, 37), respectively. (273, 37), (-508.27, -31.26), (508.27, -31.26), (34.5, -93.5), (1, -186), (-455, -246), (455, -246), (-211, 246.5), (-425, 243.5), (-270.92, -86.65), (-254, -246), (-6 40, -246), (211, 246.5), (425, 243.5), (270.92, -86.65), (254, -246), (640, -246), in mm, wherein the injection time of each injection point is set based on its distance from the origin, and the injection time of the injection point is earlier the closer it is to the origin; each injection point is connected to the injection tube (143); The front mold mechanism (1) further includes a lifting device (16) for product demolding and a vacuum device (18) for evacuating air into the product cavity. The vacuum device (18) is electrically connected to a control module, which is configured to control the evacuation time of the vacuum device (18) to within 2 seconds. The vacuum device (18) includes multiple vacuum pumps (181), a suction branch pipe (182), a manifold (183), an air intake pipe (184), and multiple air passage top blocks (185). The multiple vacuum pumps (181) are all fixedly connected to the first mold base (13). Each vacuum pump (181) is connected to the suction branch pipe (182). The suction branch pipe (182) is connected to the manifold (183), and the manifold (183) is connected to the air intake pipe (184). Multiple air passage top blocks (185) are respectively located at both ends of the first mold cavity (131) along the length direction, and the air passage top blocks (185) constitute part of the first mold cavity (131); the air intake pipe (184) is provided with multiple air intake ports, and the side wall of the air passage top block (185) is provided with an air groove (1851), the air groove (1851) is used to connect the corresponding air intake port with the product cavity, and the depth of the air groove (1851) is 0.02mm; The injection tube (143) is connected to a pressure sensor and a flow meter for detecting injection pressure. The pressure sensor and the flow meter are both electrically connected to the control module. The control module is configured to automatically adjust the vacuum flow rate of the vacuum device (18) according to the filling speed, flow rate and injection pressure of each injection tube (143). Both the front mold mechanism (1) and the rear mold mechanism (2) are connected to a temperature control device (3) for controlling the temperature of the product cavity, so as to make the surface temperature of the cavity uniform. Both the front mold mechanism (1) and the rear mold mechanism (2) are connected to an integrated energy plate (5), which has several interfaces for providing energy to each component.

2. The injection mold for a large inverted high-gloss paint-free grille according to claim 1, characterized in that: The mold closing clearance between the front mold mechanism (1) and the rear mold mechanism (2) is no greater than 0.01 mm.

3. The injection mold for a large inverted high-gloss paint-free grille according to claim 1, characterized in that: It also includes a guide positioning device (6), which includes a positioning rod (61), a fixed shaft (62), and a bearing (63). The first mold base (13) is provided with a positioning slot (133) and an installation slot (134). The positioning slot (133) matches the positioning rod (61), and the installation slot (134) communicates with the positioning slot (133). The fixed shaft (62) and the bearing (63) are located in the installation slot (134). The fixed shaft (62) is fixedly connected to the first mold base (13). The inner wall of the bearing (63) is fixedly connected to the fixed shaft (62), and the outer wall of the bearing (63) protrudes from the installation slot (134). When the first mold base (13) and the second mold base (23) are closed, the positioning rod (61) is inserted into the positioning slot (133) and abuts against the bearing (63).

4. The injection mold for a large inverted high-gloss paint-free grille according to claim 1, characterized in that: The rear mold mechanism (2) further includes an active demolding device (24), which includes an elastic component (241) and an elastic block structure (242); The spring block structure (242) includes a first spring block (2421), a second spring block (2422), a third spring block (2423), a fourth spring block (2424), a fifth spring block (2425), and a sixth spring block (2426). The first spring block (2421) and the fourth spring block (2424) are symmetrically arranged, the second spring block (2422) and the fifth spring block (2425) are symmetrically arranged, and the third spring block (2423) and the sixth spring block (2426) are symmetrically arranged. The second spring block (2422) is located between the first spring block (2421) and the third spring block (2423), and the fifth spring block (2425) is located between the fourth spring block (2424) and the sixth spring block (2426). The first spring block (2421) and the third spring block (2423) are each connected to one of the side glue inlet points (1432), and the second spring block (2422) and the fourth spring block (2424) are each connected to four of the side glue inlet points (1432). The first elastic block (2421), the second elastic block (2422), the third elastic block (2423), the fourth elastic block (2424), the fifth elastic block (2425) and the sixth elastic block (2426) constitute part of the second mold cavity (231), and each elastic block is provided with a slot for forming a grid buckle; The first spring block (2421), the second spring block (2422), the third spring block (2423), the fourth spring block (2424), the fifth spring block (2425), and the sixth spring block (2426) are all connected to the elastic component (241). The elastic component (241) is connected to the fixed rear base (22). The elastic component (241) is used to make the corresponding spring block tilt and move, and tilt from one end of the fixed rear base (22) to the other end in a direction away from each other.

5. A large inverted high-gloss paint-free grid injection mold according to claim 1, characterized in that: The lifting device (16) includes a lifting cylinder (161), a lifting plate (162), a lifting rod (163), and a lifting block (164). The lifting cylinder (161) is fixedly connected to the side wall of the first mold base (13). The lifting plate (162) is located between the first mold base (13) and the fixed front base (12). The first mold base (13) has a movable groove (135) for the lifting plate (162) to move. The lifting plate (162) is located in the movable groove (135). The side wall of the lifting plate (162) is provided with a protruding plate, which extends through the first mold base (13) to the outside. The drive shaft of the lifting cylinder (161) is fixedly connected to the protruding plate. Multiple lifting rods (163) are provided, and all of them are connected to the lifting plate (162). Multiple lifting blocks (164) are provided and are evenly distributed on the first mold base (13). The lifting blocks (164) are fixedly connected to the lifting rods (163). The lifting blocks (164) are part of the first mold cavity (131).

6. A large inverted high-gloss paint-free grid injection mold according to claim 1, characterized in that: The temperature control device (3) consists of multiple sets of water pipes (31), each water pipe (31) is connected to a water source, the distance between the water pipe (31) and the corresponding product cavity surface is 25mm, the diameter of the water pipe (31) is 15mm, and the distance between two adjacent water pipes (31) is 80mm.

7. A large inverted high-gloss paint-free grid injection mold according to claim 1 or 6, characterized in that: The first mold base (13) is connected to a mold cavity temperature sensor (17), the mold cavity temperature sensor (17) is electrically connected to the control module, and the control module is electrically connected to the temperature control device (3).

8. A large inverted high-gloss paint-free grid injection mold according to claim 1, characterized in that: Both the first mold base (13) and the second mold base (23) are equipped with a mold plate temperature sensor (4), and the probe of the mold plate temperature sensor (4) is inserted to a depth of 200mm.

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