A high-efficiency demolding thermoforming mold

Abstract

This utility model discloses a high-efficiency demolding thermoforming mold, including an upper table and a lower table of a molding machine; a molding template assembly is set between the upper and lower tables to accommodate polyethylene powder, which melts and forms the product under the heating of the molding machine; an ejector mechanism is set below the lower table to separate the template and the product within the molding template assembly; a clamping mechanism is also set between the upper and lower tables to press the molding template assembly. This high-efficiency demolding thermoforming mold features an ejector mechanism that sequentially separates the upper and middle templates from the product through its ejecting action. Furthermore, the ejector pins of this mechanism do not directly act on the product, effectively preventing damage during the demolding process and leaving no demolding marks on the product surface. Compared to traditional demolding structures, the demolding time is reduced by 60%, significantly improving demolding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of thermoforming mold technology, and in particular to a thermoforming mold with high efficiency for demolding. Background Technology

[0002] Currently, there is a common problem of demolding difficulties in PE ultra-high molecular weight polyethylene thermoforming molds. Specifically, the existing demolding process generally involves applying external force to pull the top of the upper mold plate, and sometimes it is necessary to pry it from the side of the mold plate with tools to complete the demolding work. This results in low demolding efficiency and long production cycle, thus affecting the thermoforming production efficiency.

[0003] Furthermore, using the above-mentioned demolding method can easily damage the product during the demolding process, causing scratches on the product surface and deformation of the mold, thus reducing the service life of the mold. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency demolding thermoforming mold to solve the problem of difficult demolding of PE ultra-high molecular weight polyethylene thermoforming mold products.

[0005] To solve the above technical problems, this utility model provides a high-efficiency demolding thermoforming mold, including an upper table and a lower table of a molding machine, wherein the upper table is located above the lower table and moves closer to or further away from the lower table under the action of the molding machine;

[0006] A molding template assembly is provided between the upper platform and the lower platform for containing polyethylene powder, which is then melted and molded by heating in the molding machine.

[0007] A top-feeding mechanism is provided below the lower platform, which separates the template and the product inside the forming template assembly.

[0008] A pressing mechanism is also provided between the upper platform and the lower platform to press the molding template assembly.

[0009] Preferably, the molding template assembly consists of an upper template, a middle template, and a lower template from top to bottom. The middle template has a cavity in the middle, which together with the upper template and the lower template forms a thermoforming cavity.

[0010] Preferably, the upper mold plate has an upper mold core on the side near the thermoforming cavity, and the upper mold core is detachably connected to the upper mold plate by bolts; the lower mold plate has a lower mold core on the side near the thermoforming cavity, and the lower mold core is detachably connected to the lower mold plate by bolts; different shapes of products can be formed by replacing the upper mold core and lower mold core with different structures.

[0011] Preferably, the top-feeding mechanism includes a top pin fixing plate, on which multiple middle template top pins and multiple upper template top pins are arranged; the top pin fixing plate is fixed to a lifting seat, which is connected to the piston rod of an external oil cylinder or air cylinder for pushing the top pin fixing plate, the multiple middle template top pins, and the multiple upper template top pins to move up and down; wherein the middle template top pins pass through the lower platform to lift the middle template in the forming template assembly, and the upper template top pins pass through the lower platform to lift the upper template in the forming template assembly.

[0012] Preferably, the lengths of the multiple upper template top pins are equal, and the lengths of the multiple middle template top pins are equal; however, the length of the upper template top pin is greater than the length of the middle template top pin.

[0013] Preferably, the clamping mechanism includes a rectangular spring, which is placed in the countersunk hole of the middle template and extends upward;

[0014] It also includes a compression spring cover sleeved and installed on the end of the rectangular spring away from the middle template. The compression spring cover contacts the upper platform and transmits the downward pressure of the upper platform to the middle template through the rectangular spring.

[0015] Preferably, an adjusting bolt is fitted inside the rectangular spring. One end of the adjusting bolt is slidably connected to the through hole of the middle template, and the other end is threadedly connected to the compression spring cover. The height of the compression spring cover can be adjusted by screwing it.

[0016] The side wall of the compression spring cover is also provided with a set screw, which is used to lock the height of the compression spring cover.

[0017] Preferably, a positioning ring is also installed on the middle template, and the positioning ring is slidably connected to the compression spring cover to guide the compression spring cover to move along the axis.

[0018] Preferably, an upper limit sensor group is provided on the side of the upper platform. The upper limit sensor group is a through-beam sensor used to monitor the lifting height of the upper platform.

[0019] Preferably, a lower limit sensor is provided on the side of the top material mechanism to monitor the lifting height of the top material mechanism.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This utility model features a high-efficiency demolding thermoforming mold with an ejector mechanism. Through the ejector action of the ejector mechanism, the upper and middle templates are sequentially separated from the molded product. Furthermore, the ejector pin of the ejector mechanism does not directly act on the product, thus effectively preventing damage to the product during the demolding process. This results in no demolding marks on the product surface. At the same time, compared with traditional demolding structures, the demolding time is shortened by 60%, greatly improving demolding efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the high-efficiency demolding thermoforming mold provided by this utility model;

[0023] Figure 2 This is a front view of the high-efficiency demolding thermoforming mold provided by this utility model;

[0024] Figure 3 This is a side view of the high-efficiency demolding thermoforming mold provided by this utility model;

[0025] Figure 4 yes Figure 3 Sectional view at point BB;

[0026] Figure 5 This is a cross-sectional view of the molding template assembly provided by this utility model;

[0027] Figure 6 This is a cross-sectional view of the top material mechanism provided by this utility model;

[0028] Figure 7 yes Figure 4 A partial schematic diagram of point I in the middle.

[0029] In the diagram: 1. Upper platform; 2. Lower platform; 3. Forming template assembly; 301. Upper template; 302. Middle template; 303. Lower template; 304. Upper mold core; 305. Lower mold core; 4. Ejector mechanism; 401. Ejector pin fixing plate; 402. Middle template ejector pin; 403. Upper template ejector pin; 404. Ejector seat; 5. Pressing mechanism; 501. Rectangular spring; 502. Compression spring cover; 503. Adjusting bolt; 504. Set screw; 505. Positioning ring; 6. Upper limit sensor group; 7. Lower limit sensor. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0033] This utility model provides a high-efficiency demolding thermoforming mold. Please refer to [link / reference]. Figure 1-4 The molding machine includes an upper platform 1 and a lower platform 2. The upper platform 1 is located above the lower platform 2 and moves closer to or further away from the lower platform 2 under the action of the molding machine. A molding template assembly 3 is provided between the upper platform 1 and the lower platform 2 to accommodate polyethylene powder, which is melted and molded under the heating of the molding machine. A top-feeding mechanism 4 is provided below the lower platform 2 to separate the template and the product inside the molding template assembly 3. A pressing mechanism 5 is also provided between the upper platform 1 and the lower platform 2 to press the molding template assembly 3.

[0034] Specifically, such as Figure 5 As shown, the forming template assembly 3 consists of an upper template 301, a middle template 302, and a lower template 303 from top to bottom. The middle template 302 has a cavity in the middle, which together with the upper template 301 and the lower template 303 forms a thermoforming cavity.

[0035] Furthermore, the upper mold plate 301 has an upper mold core 304 on the side near the thermoforming cavity, and the upper mold core 304 is detachably connected to the upper mold plate 301 by bolts; the lower mold plate 303 has a lower mold core 305 on the side near the thermoforming cavity, and the lower mold core 305 is detachably connected to the lower mold plate 303 by bolts; different shapes of products can be formed by replacing the upper mold core 304 and lower mold core 305 with different structures.

[0036] Specifically, such as Figure 6 As shown, the top material mechanism 4 includes a top pin fixing plate 401, on which multiple middle template top pins 402 and multiple upper template top pins 403 are arranged; the top pin fixing plate 401 is fixed on the lifting seat 404, which is connected to the piston rod of an external oil cylinder or air cylinder, for pushing the top pin fixing plate 401, the multiple middle template top pins 402 and the multiple upper template top pins 403 to move up and down; wherein the middle template top pins 402 pass through the lower platform 2 to lift the middle template 302 in the forming template assembly 3, and the upper template top pins 403 pass through the lower platform 2 to lift the upper template 301 in the forming template assembly 3.

[0037] Furthermore, the lengths of the multiple upper template top pins 403 are equal, and the lengths of the multiple middle template top pins 402 are equal; however, the length of the upper template top pin 403 is greater than the length of the middle template top pin 402.

[0038] Specifically, such as Figure 7 As shown, the clamping mechanism 5 includes a rectangular spring 501, which is placed in the countersunk hole of the middle template 302 and extends upward.

[0039] The clamping mechanism 5 also includes a spring cover 502 sleeved and installed on the end of the rectangular spring 501 away from the middle template 302. The spring cover 502 contacts the upper platform 1 and transmits the downward pressure of the upper platform 1 to the middle template 302 through the rectangular spring 501.

[0040] Furthermore, an adjusting bolt 503 is fitted inside the rectangular spring 501. One end of the adjusting bolt 503 is slidably connected to the through hole of the middle template 302, and the other end is threadedly connected to the compression spring cover 502. The height of the compression spring cover 502 can be adjusted by screwing it. The side wall of the compression spring cover 502 is also provided with a set screw 504, which locks the height of the compression spring cover 502.

[0041] Furthermore, a positioning ring 505 is also installed on the middle template 302. The positioning ring 505 is slidably connected to the compression spring cover 502 to guide the compression spring cover 502 to move along the axis.

[0042] For details, please continue reading. Figure 1-3 An upper limit sensor group 6 is provided on the side of the upper platform 1. The upper limit sensor group 6 is a through-beam sensor used to monitor the lifting height of the upper platform 1.

[0043] A lower limit sensor 7 is provided on the side of the top material mechanism 4 to monitor the lifting height of the top material mechanism 4.

[0044] This high-efficiency demolding thermoforming mold is equipped with an ejector mechanism 4. Through the ejector action of the ejector mechanism 4, the upper template 301 and the middle template 302 are sequentially separated from the molded product. Furthermore, the ejector pin of the ejector mechanism 4 does not directly act on the product, thus effectively avoiding damage to the product during the demolding process. This results in no demolding marks on the product surface. At the same time, compared with the traditional demolding structure, the demolding time is shortened by 60%, greatly improving the demolding efficiency.

[0045] The thermoforming process of PE ultra-high molecular weight polyethylene is as follows: The operator adds the weighed raw material powder into the open cavity composed of the middle mold 302, the lower mold 303, and the lower mold core 305. Then, the upper mold core 304 is inserted into the cavity of the middle mold 302. The machine is started, and the upper table 1 of the forming machine moves downward. During the process, the upper table 1 presses down on the compression spring cover 502. At this time, the rectangular spring 501 is compressed, and the compression spring cover 502 continues to move downward until the upper mold 301 and the middle mold 302 are completely in contact. Pressure heating is maintained. At this time, the middle mold 302 is pressed down by the clamping mechanism 5 to ensure that the middle mold 302 will not move upward during the heating and melting process of the powder.

[0046] After thermoforming, the material is removed, and the upper platform 1 moves upward. It stops when it is completely separated from the upper template 301 and rises to the height of the through-beam upper limit sensor group 6. At this time, the spring tension of the clamping mechanism 5 is not fully released, and there is still an appropriate force pressing down on the middle template 302. This pressure must ensure that the middle template 302 does not shift when it loosens. Then, the hydraulic cylinder or air cylinder pushes the lifting seat 404, which drives the top pin fixing plate 401, multiple middle template top pins 402 and multiple upper template top pins 402. 3. Moving upwards, multiple upper template pins 403 pass through the holes on the template and first push against the upper template 301, causing the upper mold core 304 to detach from the cavity of the middle template 302. Then, multiple middle template pins 402 push against the middle template 302, overcoming the pressure of the clamping mechanism 5 and causing the middle template 302 to detach from the lower mold core 305. The movement stops when the pin fixing plate 401 moves to the position sensed by the lower limit sensor 7. At the same time, the upper table 1 continues to move upwards until the initial point, and the personnel can then remove the formed product.

[0047] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A high-efficiency demolding thermoforming mold, characterized in that, It includes an upper table (1) and a lower table (2) of the molding machine. The upper table (1) is located above the lower table (2) and moves closer to or further away from the lower table (2) under the action of the molding machine. A molding template assembly (3) is provided between the upper platform (1) and the lower platform (2) for containing polyethylene powder, which is then melted and molded by heating in the molding machine. A top material mechanism (4) is provided below the lower platform (2) to separate the template and product inside the forming template assembly (3); A pressing mechanism (5) is also provided between the upper platform (1) and the lower platform (2) to press the molding template assembly (3).

2. The high-efficiency demolding thermoforming mold as described in claim 1, characterized in that, The forming template assembly (3) consists of an upper template (301), a middle template (302), and a lower template (303) from top to bottom. The middle template (302) has a cavity in the middle, which together with the upper template (301) and the lower template (303) forms a thermoforming cavity.

3. The high-efficiency demolding thermoforming mold as described in claim 2, characterized in that, The upper template (301) has an upper mold core (304) on the side near the thermoforming cavity, and the upper mold core (304) is detachably connected to the upper template (301) by bolts; the lower template (303) has a lower mold core (305) on the side near the thermoforming cavity, and the lower mold core (305) is detachably connected to the lower template (303) by bolts; different shapes of products can be formed by replacing the upper mold core (304) and lower mold core (305) with different structures.

4. The high-efficiency demolding thermoforming mold as described in claim 3, characterized in that, The top material mechanism (4) includes a top pin fixing plate (401), on which multiple middle template top pins (402) and multiple upper template top pins (403) are arranged; the top pin fixing plate (401) is fixed on the lifting seat (404), which is connected to the piston rod of an external oil cylinder or air cylinder, for pushing the top pin fixing plate (401), the multiple middle template top pins (402) and the multiple upper template top pins (403) to move up and down; wherein the middle template top pins (402) pass through the lower platform (2) to lift the middle template (302) in the forming template assembly (3), and the upper template top pins (403) pass through the lower platform (2) to lift the upper template (301) in the forming template assembly (3).

5. The high-efficiency demolding thermoforming mold as described in claim 4, characterized in that, The lengths of the multiple upper template top pins (403) are equal, and the lengths of the multiple middle template top pins (402) are equal; however, the length of the upper template top pins (403) is greater than the length of the middle template top pins (402).

6. The high-efficiency demolding thermoforming mold as described in claim 2, characterized in that, The clamping mechanism (5) includes a rectangular spring (501) placed in the countersunk hole of the middle template (302) and extending upward; It also includes a compression spring cover (502) sleeved and installed on the end of the rectangular spring (501) away from the middle template (302). The compression spring cover (502) contacts the upper platform (1) and transmits the downward pressure of the upper platform (1) to the middle template (302) through the rectangular spring (501).

7. The high-efficiency demolding thermoforming mold as described in claim 6, characterized in that, An adjusting bolt (503) is fitted inside the rectangular spring (501). One end of the adjusting bolt (503) is slidably connected to the through hole of the middle template (302), and the other end is threadedly connected to the compression spring cover (502). The height of the compression spring cover (502) can be adjusted by screwing it. The side wall of the spring cover (502) is also provided with a set screw (504) to lock the height of the spring cover (502).

8. The high-efficiency demolding thermoforming mold as described in claim 7, characterized in that, A positioning ring (505) is also installed on the middle template (302). The positioning ring (505) is slidably connected to the compression spring cover (502) to guide the compression spring cover (502) to move along the axis.

9. The high-efficiency demolding thermoforming mold as described in claim 1, characterized in that, An upper limit sensor group (6) is provided on the side of the upper platform (1). The upper limit sensor group (6) is a through-beam sensor used to monitor the lifting height of the upper platform (1).

10. The high-efficiency demolding thermoforming mold as described in claim 1, characterized in that, The top material mechanism (4) is provided with a lower limit sensor (7) on its side to monitor the lifting height of the top material mechanism (4).

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