Injection mold for thermoplastic elastomer processing
By introducing overflow channels, side plates, ejection mechanisms, and cooling pipe layouts into the mold, the problems of demolding and cooling efficiency in thermoplastic elastomer molds are solved, achieving efficient demolding and uniform cooling, thereby improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BAORUILONG POLYMER MATERIAL (TIANJIN) CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional thermoplastic elastomer molds have problems with demolding and cooling efficiency, resulting in product adhesion, deformation, uneven cooling, and low production efficiency.
An injection mold was designed, comprising an overflow groove, a side plate, an ejection mechanism, and a cooling mechanism. The bottom surface of the overflow groove is roughened, the ejection mechanism adopts a combination of a cylinder and a push block, and the cooling mechanism adopts a spiral and serpentine cooling pipe layout to improve demolding efficiency and cooling uniformity.
It effectively avoids material adhesion and product deformation, improves demolding efficiency and cooling efficiency, and ensures product quality and production efficiency.
Smart Images
Figure CN224240260U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thermoplastic elastomer processing, and in particular to an injection mold for thermoplastic elastomer processing. Background Technology
[0002] Thermoplastic elastomers (TPEs) are polymeric materials that combine the properties of rubber and thermoplastics. They exhibit the elasticity of rubber at room temperature while melting and flowing like thermoplastics at high temperatures, allowing for processing such as extrusion, injection molding, and blow molding. Thermoplastic elastomers possess excellent flexibility, weather resistance, chemical resistance, and processing performance, making them widely used in numerous fields such as automotive, electronics, medical, and toys. As industries continuously raise their requirements for product performance and quality, the applications of thermoplastic elastomers are becoming increasingly widespread, and the demands for processing precision and efficiency are becoming increasingly stringent. Injection molding, as one of the main methods for processing thermoplastic elastomers, directly impacts product quality and production efficiency through the performance of the mold.
[0003] Thermoplastic elastomers have a certain degree of viscosity, making it easy for the product to stick to the mold after injection molding, especially in complex mold cavities and overflow channels, where demolding becomes even more difficult. Traditional mold demolding mechanisms are often complex in structure and inconvenient to operate, and the demolding force is uneven, which can easily lead to product deformation or damage, reducing the product yield. In addition, during the injection molding of thermoplastic elastomers, the cooling rate has a significant impact on product quality and production efficiency. The cooling system design of traditional molds is not reasonable enough, and the flow path of the cooling medium is singular, resulting in inconsistent cooling rates in different parts of the moving mold. This can easily cause internal stress in the product, leading to deformation, warping, and other problems. At the same time, low cooling efficiency will also prolong the product molding cycle and reduce production efficiency. Utility Model Content
[0004] To address the problems of low demolding and cooling efficiency in existing technologies, this utility model provides an injection mold for processing thermoplastic elastomers;
[0005] The present invention provides an injection mold for processing thermoplastic elastomers, which adopts the following technical solution:
[0006] An injection mold for processing thermoplastic elastomers includes a base plate, a column, a fixed mold, and a moving mold. The column is mounted on the top of the base plate, the fixed mold is mounted on the top of the column, and the moving mold is mounted on the upper side of the fixed mold. The moving mold is connected to an external power device and, when combined with the fixed mold, can be used to process thermoplastic elastomers. The fixed mold has an internal cavity and an overflow groove. The overflow groove surrounds the outside of the cavity and is separated from the cavity by a surrounding plate. The moving mold and the cavity compress the thermoplastic elastomer, and the overflow portion overflows into the overflow groove through the gap between the surrounding plate and the moving mold. An ejection mechanism is mounted on the bottom of the fixed mold for ejecting objects from the cavity and the overflow groove. A cooling mechanism acting on the outer wall and interior of the fixed mold is also provided on the top of the base plate.
[0007] Furthermore, the bottom surface of the overflow channel is roughened to reduce adhesion.
[0008] Furthermore, the ejection mechanism includes an ejector rod, a main ejector plate, a spring, a connecting rod, an auxiliary rod, a side ejector plate, and a sliding sleeve; the ejector rod is installed through the interior of the fixed mold; the top of the ejector rod extends into the mold cavity and is bolted to the main ejector plate; the bottom of the fixed mold is bolted to the sliding sleeve; the bottom of the ejector rod passes through the sliding sleeve and is fixedly connected to the sliding sleeve by a spring; at least two connecting rods are welded to the outer wall of the ejector rod; an auxiliary rod is welded to the top of the connecting rod, each of the auxiliary rods extends through the fixed mold into the overflow groove and is welded to a side ejector plate; a drive mechanism for driving the ejector rod to slide up and down is provided at the bottom of the ejector rod;
[0009] Furthermore, the driving mechanism includes a cylinder, a push block, a slide rail, and rollers. The top of the base plate is bolted to the cylinder; the output end of the cylinder is connected to the push block; the push block has a right-angled trapezoidal structure; the bottom of the push rod is bolted to the rollers; the rollers are in close contact with the inclined side of the push block structure.
[0010] Furthermore, a slide rail is bolted to the top of the base plate; the bottom of the push block is slidably connected to the slide rail.
[0011] Furthermore, the cooling mechanism includes a first cooling pipe, a second cooling pipe, and a circulating cooling device; the first cooling pipe is disposed on the outer wall of the fixed mold; the second cooling pipe is disposed inside the fixed mold; a circulating cooling device is installed on the top of the base plate; the inlet and outlet ends of the first and second cooling pipes are respectively connected to each other and connected to the output and input ends of the circulating cooling device through hoses.
[0012] Furthermore, the first cooling pipe is spirally arranged around the outer wall of the fixed mold and embedded in the side wall of the fixed mold; the second cooling pipe is evenly distributed in a serpentine shape inside the fixed mold.
[0013] In summary, the beneficial effects of this utility model are as follows:
[0014] This invention, by incorporating an overflow groove and a surrounding plate inside the fixed mold, guides overflowing material into the overflow groove, preventing material contamination of the mold surface and avoiding flash and burrs on the finished product. The roughened design of the bottom surface of the overflow groove reduces material adhesion to the overflow groove, facilitating demolding. The ejection mechanism can simultaneously eject objects from both the mold cavity and the overflow groove, improving demolding efficiency and reliability. The drive mechanism uses a combination of cylinders and push blocks to convert horizontal motion into vertical motion, resulting in a simple structure and high transmission efficiency. The cooling mechanism, through the rational layout of the first and second cooling pipes, ensures that the cooling medium can uniformly cool the fixed mold, improving cooling efficiency and guaranteeing product quality and production efficiency. It effectively solves the technical problems existing in traditional thermoplastic elastomer processing molds, possessing significant advantages and application value. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is a schematic plan view of the overall structure of the mold fixing part of this utility model;
[0017] Figure 3 This is a schematic diagram showing the distribution of the second cooling pipe of this utility model;
[0018] Figure 4 This is a schematic diagram of the internal structure of the fixed mold cavity of this utility model.
[0019] As shown in the figure: 1-base plate, 2-column, 21-fixed mold, 22-moving mold, 3-mold cavity, 31-side plate, 32-overflow groove, 4-cylinder, 41-push block, 42-slide rail, 5-ejector rod, 51-main top plate, 52-spring, 53-roller, 54-connecting rod, 55-auxiliary rod, 56-side top plate, 57-balance plate, 58-sliding sleeve, 6-first cooling pipe, 61-second cooling pipe, 63-circulating cooling device. Detailed Implementation
[0020] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described in detail below:
[0021] An injection mold for processing thermoplastic elastomers, such as Figure 1-4As shown, the device includes a base plate 1, a column 2, a fixed mold 21, and a moving mold 22. The column 2 is mounted on the top of the base plate 1, and the fixed mold 21 is mounted on the top of the column 2. The moving mold 22 is mounted on the upper side of the fixed mold 21. The moving mold 22 is connected to an external power device and, in conjunction with the fixed mold 21, can be used to process thermoplastic elastomers. The fixed mold 21 has a cavity 3 and an overflow groove 32 inside. The overflow groove 32 surrounds the outside of the cavity 3, and a surrounding plate 31 is provided between the overflow groove 3 and the cavity 3. The moving mold 22 extrudes the thermoplastic elastomer against the cavity 3, and the overflow portion passes through the surrounding plate 31. The gap between the moving mold 22 and the fixed mold 21 overflows into the overflow groove 32; the bottom of the fixed mold 21 is equipped with an ejection mechanism for ejecting objects from the mold cavity 3 and the overflow groove 32 respectively; the top of the base plate 1 is also provided with a cooling mechanism acting on the outer wall and interior of the fixed mold 21; in this embodiment, the moving mold 22 is connected to an external power device and can move up and down relative to the fixed mold 21 under the action of power. When the moving mold 22 and the fixed mold 21 are combined, the space formed between them can be used to accommodate thermoplastic elastomers, which are then processed into the required shape through injection molding; the external power device, such as hydraulic... The machine, etc., drives the moving mold 22 downwards, gradually approaching the fixed mold 21 until the two are tightly fitted, forming a closed molding space; then, the injection molding of the thermoplastic elastomer is performed. After processing, the power unit drives the moving mold 22 upwards, separating it from the fixed mold 21, so that the molded product can be removed; at the same time, the addition of the ejection mechanism and cooling mechanism ensures that the thermoplastic elastomer can be molded and demolded in a suitable space, reducing the defect rate; the mold cavity 3 is the space for the final molding of the thermoplastic elastomer, and its shape and size determine the shape and size of the product; the overflow groove 32 surrounds the outside of the mold cavity 3, when the moving mold 22 is moved upwards, the moving mold 22 moves downwards, gradually approaching the fixed mold 21, until the two are tightly fitted, forming a closed molding space; then, the moving mold 22 is injected into the mold, and the molded product is removed. When the mold 22 and the fixed mold 21 extrude the thermoplastic elastomer, excess material flows into the overflow groove 32 through the gap between the side plate 31 and the moving mold 22. This prevents excessive material from causing excessive pressure in the mold cavity 3, which would affect the quality of the product. During the downward pressing of the moving mold 22, the thermoplastic elastomer is injected into the mold cavity 3. As the moving mold 22 continues to press down, the material in the mold cavity 3 is gradually filled. When the material reaches a certain amount, the excess will overflow from the gap between the side plate 31 and the moving mold 22 and flow into the overflow groove 32. At the same time, the overflowing material can be recycled and reused, reducing production costs.
[0022] like Figure 3 , 4As shown, the bottom surface of the overflow channel 32 is set as a rough surface to reduce adhesion. In this embodiment, setting the bottom surface of the overflow channel 32 as a rough surface increases the friction between the material and the bottom surface of the overflow channel 32, which reduces the adhesion between the material and the bottom surface after cooling and solidification, making it easier to remove the material from the overflow channel 32. When the overflowing thermoplastic elastomer flows into the overflow channel 32 and cools and solidifies, the contact area between the material and the bottom surface increases due to the rough structure of the bottom surface, but the increased friction prevents the material from sticking tightly to the bottom surface. When the ejection mechanism is working, the solidified material can be ejected from the overflow channel 32 more easily. This reduces the adhesion between the material and the overflow channel 32, reduces the difficulty of demolding, and improves production efficiency.
[0023] like Figure 1 , 2 As shown, the ejection mechanism includes an ejector rod 5, a main top plate 51, a spring 52, a connecting rod 54, an auxiliary rod 55, a side top plate 56, and a sliding sleeve 58. The ejector rod 5 is installed through the interior of the fixed mold 21. The top of the ejector rod 5 extends into the mold cavity 3 and is bolted to the main top plate 51. The bottom of the fixed mold 21 is bolted to the sliding sleeve 58. The bottom of the ejector rod passes through the sliding sleeve 58 and is fixedly connected to the sliding sleeve 58 by a spring 52. At least two connecting rods 54 are welded to the outer wall of the ejector rod. An auxiliary rod 55 is welded to the top of the connecting rod 54, and each auxiliary rod 55 extends through the fixed mold 21 into the overflow groove 32 and is welded to a side top plate 56. A drive mechanism for driving the ejector rod 5 to slide up and down is provided at the bottom of the ejector rod 5. In this embodiment, the ejection mechanism drives the ejector rod 5 to slide up and down. The drive mechanism moves the ejector rod 5 upward, causing the main ejector plate 51 and the side ejector plate 56 to eject the objects in the mold cavity 3 and the overflow groove 32 respectively. The spring 52 provides a restoring force after the ejector rod 5 rises, allowing the ejector rod 5 to return to its initial position. The connecting rod 54 and the auxiliary rod 55 transmit the movement of the ejector rod 5 to the side ejector plate 56 to achieve synchronous ejection. When the drive mechanism drives the ejector rod 5 to move upward, the main ejector plate 51 at the top of the ejector rod 5 moves upward accordingly, ejecting the molded product in the mold cavity 3. At the same time, the connecting rod 54 welded to the outer wall of the ejector rod 5 also rises with the ejector rod 5, and the auxiliary rod 55 at the top of the connecting rod 54 drives the side ejector plate 56 to move upward, ejecting the solidified material in the overflow groove 32. When the drive mechanism lowers the ejector rod 5, the elastic force of the spring 52 helps the ejector rod 5 return to its initial position.
[0024] like Figure 1 , 2As shown, the driving mechanism includes a cylinder 4, a push block 41, a slide rail 42, and a roller 53. The top of the base plate 1 is bolted to the cylinder 4; the output end of the cylinder 4 is connected to the push block 41; the push block 41 has a right-angled trapezoidal structure; the bottom of the push rod 5 is bolted to the roller 53; the roller 53 is in close contact with the inclined side of the push block 41 structure; in this embodiment, the cylinder 4 serves as a power source, and the extension and retraction of its output end drives the push block 41 to slide on the slide rail 42; the push block 41 has a right-angled trapezoidal structure, and the roller 53 is in close contact with the inclined side of the push block 41. When the push block 41 slides, the inclined side will exert an upward force on the roller 53. The cylinder generates a thrust, which causes the push rod 5 to move upward. When the cylinder starts, the output end extends, pushing the push block 41 to slide forward along the slide rail 42. Since the roller 53 is in contact with the inclined side of the push block 41, the sliding of the push block 41 will cause the roller 53 to roll on the inclined side, generating an upward component force that pushes the push rod 5 upward. When the cylinder retracts, the push block 41 slides in the opposite direction, and the roller 53 rolls downward along the inclined side under the action of the spring 52, causing the push rod 5 to descend accordingly. This drive mechanism uses the linear motion of the cylinder 4 and the inclined side structure of the push block 41 to convert the horizontal motion into the vertical motion of the push rod 5. It has a simple structure and high transmission efficiency.
[0025] like Figure 1 , 2 As shown, a slide rail 42 is bolted to the top of the base plate 1; the bottom of the push block 41 is slidably connected to the slide rail 42; in this embodiment, the slide rail 42 ensures the stability of the movement trajectory of the push block 41, and improves the reliability and stability of the ejection mechanism.
[0026] like Figure 1 , 2As shown, the cooling mechanism includes a first cooling pipe 6, a second cooling pipe 61, and a circulating cooling device 63. The first cooling pipe 6 is disposed on the outer wall of the fixed mold 21; the second cooling pipe 61 is disposed inside the fixed mold 21; the circulating cooling device 63 is installed on the top of the base plate 1; the inlet and outlet ends of the first cooling pipe 6 and the second cooling pipe 61 are respectively connected to the output and input ends of the circulating cooling device 63 via hoses; the first cooling pipe 6 spirals around the outer wall of the fixed mold 21 and is embedded in the side wall of the fixed mold 21; the second cooling pipe 61 is evenly distributed in a serpentine pattern inside the fixed mold 21; in this embodiment, the circulating cooling device 63 provides a cooling medium, which is transported to the first cooling pipe 6 and the second cooling pipe 61 through hoses; the first cooling pipe 6 is disposed on the outer wall of the fixed mold 21, and the second cooling pipe 61 is disposed inside the fixed mold 21. When the cooling medium flows inside the pipes, it absorbs the heat of the fixed mold 21, thereby reducing the temperature of the fixed mold 21. The temperature of the mold 21 is 1, which accelerates the cooling and curing of the thermoplastic elastomer. After the circulating cooling device is started, the cooling medium is pumped into the inlet of the first cooling pipe 6 and the second cooling pipe 61. The cooling medium flows in a spiral shape in the first cooling pipe 6, making full contact with the outer wall of the fixed mold 21 and absorbing heat. In the second cooling pipe 61, it flows in a serpentine shape, absorbing heat evenly inside the fixed mold 21. After absorbing heat, the cooling medium flows out from the outlet and returns to the circulating cooling device through a hose for cooling, and then is recycled again. The cooling mechanism can effectively reduce the temperature of the fixed mold 21, accelerate the cooling and curing process of the thermoplastic elastomer, shorten the production cycle, and improve production efficiency. The spiral shape of the first cooling pipe 6 and the serpentine shape of the second cooling pipe 61 make the cooling medium contact the fixed mold 21 more evenly, ensuring that the temperature of each part of the fixed mold 21 is uniform, avoiding problems such as product deformation caused by uneven temperature, and improving the quality of the product.
[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. An injection mold for processing thermoplastic elastomers, comprising a base plate (1), a column (2), a fixed mold (21), and a movable mold (22), wherein the column (2) is mounted on the top of the base plate (1), the fixed mold (21) is disposed on the top of the column (2), and the movable mold (22) is disposed on the upper side of the fixed mold (21), the movable mold (22) being connected to an external power device and combined with the fixed mold (21) for processing thermoplastic elastomers; characterized in that: The fixed mold (21) has a mold cavity (3) and an overflow groove (32) inside. The overflow groove (32) surrounds the outside of the mold cavity (3) and is provided with a surrounding plate (31) between it and the mold cavity (3). The moving mold (22) and the mold cavity (3) extrude thermoplastic elastomer, and the overflowing part overflows into the overflow groove (32) through the gap between the surrounding plate (31) and the moving mold (22). The bottom of the fixed mold (21) is equipped with an ejection mechanism for ejecting objects in the mold cavity (3) and the overflow groove (32) respectively. The top of the bottom plate (1) is also provided with a cooling mechanism that acts on the outer wall and inside of the fixed mold (21).
2. An injection mold for processing thermoplastic elastomers according to claim 1, characterized in that... The bottom surface of the overflow groove (32) is roughened to reduce adhesion.
3. An injection mold for processing thermoplastic elastomers according to claim 1, characterized in that... The ejection mechanism includes an ejector rod (5), a main top plate (51), a spring (52), a connecting rod (54), an auxiliary rod (55), a side top plate (56), and a sliding sleeve (58); the ejector rod (5) is provided through the interior of the fixed mold (21); the top of the ejector rod (5) extends into the mold cavity (3) and is connected to the main top plate (51) by bolts; the bottom of the fixed mold (21) is connected to the sliding sleeve (58) by bolts; the bottom of the ejector rod (5) passes through the sliding sleeve (58) and is fixedly connected to the sliding sleeve (58) by a spring (52); at least two connecting rods (54) are welded to the outer side wall of the ejector rod (5); an auxiliary rod (55) is welded to the top of the connecting rod (54), and each auxiliary rod (55) extends through the fixed mold (21) into the overflow groove (32) and is welded to a side top plate (56); a driving mechanism for driving the ejector rod (5) to slide up and down is provided at the bottom of the ejector rod (5).
4. An injection mold for processing thermoplastic elastomers according to claim 3, characterized in that... The driving mechanism includes a cylinder (4), a push block (41), a slide rail (42), and a roller (53). The top of the base plate (1) is connected to the cylinder (4) by bolts. The output end of the cylinder (4) is connected to the push block (41). The push block (41) is a right-angled trapezoidal structure. The bottom of the top rod (5) is connected to the roller (53) by bolts. The roller (53) is in close contact with the inclined side of the push block (41).
5. An injection mold for processing thermoplastic elastomers according to claim 4, characterized in that... The top of the base plate (1) is bolted with a slide rail (42); the bottom of the push block (41) is slidably connected to the slide rail (42).
6. An injection mold for processing thermoplastic elastomers according to claim 1, characterized in that... The cooling mechanism includes a first cooling pipe (6), a second cooling pipe (61), and a circulating cooling device (63); the first cooling pipe (6) is disposed on the outer side wall of the fixed mold (21); the second cooling pipe (61) is disposed inside the fixed mold (21); the circulating cooling device (63) is installed on the top of the base plate (1); the inlet and outlet ends of the first cooling pipe (6) and the second cooling pipe (61) are respectively connected and connected to the output and input ends of the circulating cooling device (63) through hoses.
7. An injection mold for processing thermoplastic elastomers according to claim 6, characterized in that... The first cooling pipe (6) is spirally wrapped around the outer side wall of the fixed mold (21) and embedded in the side wall of the fixed mold (21); the second cooling pipe (61) is evenly distributed in a serpentine shape inside the fixed mold (21).