Vacuum sealing structure for plastic suction mold

Abstract

The utility model relates to the technical field of plastic uptake molds, in particular to a vacuum sealing structure for a plastic uptake mold, which comprises a bottom plate, a vacuum box fixedly connected to the top of the bottom plate, a plastic uptake mold body mounted in the vacuum box, an abutting sealing mechanism arranged on the vacuum box, a first hydraulic cylinder fixedly connected to the rear side of the top of the bottom plate, and a second hydraulic cylinder fixedly connected to the rear side of the top of the bottom plate. The top of the output end of the first hydraulic cylinder is fixedly connected with a fixed fork plate, the front side of the fixed fork plate is fixedly provided with a fixed frame, and the fixed frame is provided with a clamping sealing mechanism. The side wall of the vacuum box is sealed through abutting fit between the abutting sealing strip and the side wall sealing ring, the sealing effect is improved, the movable frame can rapidly clamp plastic sheets through the clamping sealing mechanism, clamps do not need to be manually locked one by one, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum forming mold technology, specifically relating to a vacuum sealing structure for vacuum forming molds. Background Technology

[0002] Vacuum forming is a common plastic molding process widely used in the manufacture of various types of packaging materials, product shells and other plastic products. Vacuum adsorption requires the use of blister molds, which are the core components of the vacuum forming process. They determine the shape, size and quality of the final product. The design and manufacture of blister molds are crucial to ensuring efficient production and high-quality finished products.

[0003] Vacuum forming typically uses a frame to clamp and fix the edges of a plastic sheet. The sheet is then heated and softened before being transferred to a vacuum forming mold. However, in existing technologies, multiple clamps are usually used to hold the sheet, requiring the loosening and tightening of multiple clamps during loading and unloading, which is time-consuming and labor-intensive. When the frame moves to the vacuum forming mold, a cylinder is usually used to press the frame onto the mold from top to bottom, using downward pressure for sealing, which results in a poor sealing effect. Utility Model Content

[0004] The purpose of this utility model is to provide a vacuum sealing structure for blister molds that is simple in structure and reasonably designed in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A vacuum sealing structure for a thermoforming mold includes a base plate, a vacuum box fixedly connected to the top of the base plate, a thermoforming mold body installed inside the vacuum box, a sealing mechanism on the vacuum box, a hydraulic cylinder fixedly connected to the rear top of the base plate, a fixed fork plate fixedly connected to the top of the output end of the hydraulic cylinder, a fixed frame fixedly installed on the front side of the fixed fork plate, and a clamping sealing mechanism on the fixed frame.

[0007] The sealing mechanism includes a limiting groove on the top of the vacuum box, and a first sealing groove and a second sealing groove are respectively opened at the bottom of the limiting groove. Fixed sleeves are fixedly connected to the four side walls of the vacuum box, and a movable rod slides through the center of each of the four fixed sleeves. The end of the movable rod near the center of the vacuum box slides through the vacuum box and is fixedly connected to a sealing strip. A guide groove is opened at the top of the sealing strip. A stop block is fixedly sleeved in the middle of the movable rod, and a first spring is sleeved on the outside of the middle of the movable rod. The first spring is located between the stop block and the inside of the fixed sleeve.

[0008] Preferably, the vacuum forming mold body has several suction holes, and the suction holes are connected to a vacuum pump through pipes.

[0009] Preferably, the clamping and sealing mechanism includes a drive clamping assembly and a movable frame. The drive clamping assembly includes a cross-shaped fixing plate fixedly connected to the middle of the fixed frame. A second hydraulic cylinder is fixedly connected to the top center of the top of the cross-shaped fixing plate. A cross-shaped movable plate is fixedly connected to the top of the output end of the second hydraulic cylinder. Four guide rods are fixedly connected to the bottom of the cross-shaped movable plate. A first fixing ear plate is slidably sleeved in the middle of each of the four guide rods.

[0010] Preferably, the four No. 1 fixed ear plates are respectively fixedly connected to the four side walls of the fixed frame, and the bottom of the guide rod is fixedly connected to the No. 2 fixed ear plate. The four No. 2 fixed ear plates are all fixedly connected to the movable frame.

[0011] Preferably, a second spring is sleeved on the lower part of the guide rod, and the second spring is disposed between the first fixing ear plate and the second fixing ear plate.

[0012] Preferably, a side wall sealing ring is fixedly sleeved on the outside of the movable frame, and a guide groove is opened at the bottom of the side wall sealing ring. A first bottom sealing ring and a second bottom sealing ring are fixedly connected to the bottom of the movable frame, and the bottoms of the first bottom sealing ring and the second bottom sealing ring are both arc-shaped.

[0013] The beneficial effects of this utility model are as follows: By setting up a sealing mechanism, this utility model uses two sealing grooves of different depths and a bottom sealing ring to seal the top of the vacuum box. By using the tight fit between the sealing strip and the side wall sealing ring, the side wall of the vacuum box is sealed, improving the sealing effect. In addition, the clamping sealing mechanism enables the movable frame to quickly clamp the plastic sheet without the need for manual locking of each clamp, resulting in high work efficiency. Furthermore, when the movable frame is raised and lowered to clamp, multiple points move synchronously, resulting in uniform clamping force and strong clamping stability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0015] Figure 2 This is a first-view schematic diagram of the clamping and sealing mechanism, the fixing fork plate, the fixing frame, and the No. 1 hydraulic cylinder of this utility model.

[0016] Figure 3 This is a second-view schematic diagram of the clamping and sealing mechanism, the fixing fork plate, the fixing frame, and the No. 1 hydraulic cylinder of this utility model.

[0017] Figure 4 This is a partial sectional view of the vacuum box, the thermoforming mold body, and the sealing mechanism of this utility model.

[0018] Figure 5 This is the utility model Figure 4 Enlarged schematic diagram of region A in the middle.

[0019] In the diagram: 1. Base plate; 2. Vacuum box; 3. Vacuum forming mold body; 4. Sealing mechanism; 41. Sealing strip; 42. Sealing groove 1; 43. Sealing groove 2; 44. Stop block; 45. Spring 1; 46. Movable rod; 47. Fixed sleeve; 48. Limiting groove; 5. Clamping and sealing mechanism; 51. Drive clamping assembly; 511. Cross movable plate; 512. Hydraulic cylinder 2; 513. Guide rod; 514. Fixed ear plate 1; 515. Spring 2; 516. Fixed ear plate 2; 517. Cross fixed plate; 52. Movable frame; 53. Side wall sealing ring; 54. Bottom sealing ring 1; 55. Bottom sealing ring 2; 6. Fixed fork plate; 7. Fixed frame; 8. Hydraulic cylinder 1. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example

[0022] Please see Figure 1 The vacuum sealing structure for the thermoforming mold includes a base plate 1, a vacuum box 2 fixedly connected to the top of the base plate 1, a thermoforming mold body 3 installed inside the vacuum box 2, a sealing mechanism 4 on the vacuum box 2, a hydraulic cylinder 8 fixedly connected to the rear top of the base plate 1, a fixed fork plate 6 fixedly connected to the top of the output end of the hydraulic cylinder 8, a fixed frame 7 fixedly installed on the front side of the fixed fork plate 6, a clamping sealing mechanism 5 on the fixed frame 7, and several suction holes opened on the thermoforming mold body 3, and the suction holes are connected to a vacuum pump through pipes.

[0023] In use, this utility model utilizes the clamping and sealing mechanism 5 to quickly clamp and fix the plastic sheet. The cooperation between the clamping and sealing mechanism 4 and the clamping and sealing mechanism 5 achieves a vacuum seal between the vacuum box 2 and the plastic material. The thermoforming mold body 3 is used for thermoforming the heated and softened sheet.

[0024] Please see Figure 1 and Figure 2The clamping and sealing mechanism 5 includes a drive clamping assembly 51 and a movable frame 52. The drive clamping assembly 51 includes a cross-shaped fixing plate 517 fixedly connected to the middle of the fixed frame 7. A second hydraulic cylinder 512 is fixedly connected to the top center of the top of the cross-shaped fixing plate 517. A cross-shaped movable plate 511 is fixedly connected to the top of the output end of the second hydraulic cylinder 512. Four guide rods 513 are fixedly connected to the bottom of the cross-shaped movable plate 511. A first fixing ear plate 514 is slidably sleeved in the middle of each of the four guide rods 513. The four first fixing ear plates 514 are fixedly connected to the four side walls of the fixed frame 7 respectively. A second fixing ear plate 516 is fixedly connected to the bottom of the guide rods 513. The movable frame 52 is fixedly connected to the four second fixing ear plates 516.

[0025] Please see Figure 2 and Figure 3 A second spring 515 is sleeved in the lower part of the guide rod 513, and the second spring 515 is located between the first fixed ear plate 514 and the second fixed ear plate 516. A side wall sealing ring 53 is fixedly sleeved on the outside of the movable frame 52. A guide groove is opened at the bottom of the side wall sealing ring 53. A first bottom sealing ring 54 and a second bottom sealing ring 55 are fixedly connected to the bottom of the movable frame 52, and the bottoms of the first bottom sealing ring 54 and the second bottom sealing ring 55 are both arc-shaped.

[0026] In use, first place the blister sheet on top of the movable frame 52. Then, start the second hydraulic cylinder 512. The output end of the second hydraulic cylinder 512 extends, simultaneously driving the cross movable plate 511 and the guide rod 513 on it to move upward. Then, simultaneously driving the second fixed ear plate 516 and the movable frame 52 to move upward. At the same time, during the upward movement of the second fixed ear plate 516, the second spring 515 is compressed, simultaneously driving the blister sheet on top of the movable frame 52 to move upward, tightly clamping the blister sheet between the fixed frame 7 and the movable frame 52. This achieves quick clamping and fixing of the blister sheet, eliminating the need for manual locking of each clamp, resulting in high work efficiency. After clamping, move the heater to the bottom of the blister sheet to heat and soften it.

[0027] Please see Figure 1 , Figure 4 and Figure 5 The sealing mechanism 4 includes a limiting groove 48 on the top of the vacuum box 2, and a first sealing groove 42 and a second sealing groove 43 are respectively opened at the bottom of the limiting groove 48. Fixed sleeves 47 are fixedly connected to the four side walls of the vacuum box 2, and movable rods 46 slide through the center of each of the four fixed sleeves 47. The end of the movable rod 46 near the center of the vacuum box 2 slides through the vacuum box 2 and is fixedly connected to a sealing strip 41. A guide groove is opened at the top of the sealing strip 41. A stop block 44 is fixedly sleeved in the middle of the movable rod 46. A first spring 45 is sleeved on the outside of the middle of the movable rod 46. The first spring 45 is located between the stop block 44 and the fixed sleeve 47.

[0028] After the plastic sheet softens, the heater is removed, and the output end of hydraulic cylinder 8 shortens, simultaneously driving the fixed fork plate 6 and the fixed frame 7 above it to move downwards. This also drives the clamping sealing mechanism 5 and the softened plastic sheet downwards. As the movable frame 52 descends, it causes the side wall sealing ring 53 above it to descend. The guide groove at the bottom of the side wall sealing ring 53 engages with the guide groove at the top of the sealing strip 41, causing the sealing strip 41 to move away from the center of the vacuum box 2. Simultaneously, this causes the movable rod 46 and the stop block 44 above it to move away from the center of the vacuum box 2. During the movement, the first spring 45 is compressed. The elastic force of the first spring 45 maintains the tension between the sealing strip 41 and the side wall sealing ring 53, thus achieving the side wall sealing of the vacuum box 2. As the movable frame 52 continues to descend, the first bottom sealing ring 54 is inserted into the second sealing groove 43, and the second bottom sealing ring 55 is inserted into the first sealing groove 42, thus achieving the bottom sealing of the vacuum box 2 and improving the sealing effect. After sealing is completed, the vacuum pump connected to the blister mold body 3 is started to achieve the blister molding of the plastic sheet. After cooling, the molded product can be taken out.

[0029] It should be noted that this blister mold uses a vacuum sealing structure. In use, the plastic sheet is first clamped quickly and stably using the clamping and sealing mechanism 5. After clamping, the plastic sheet is heated and softened using a heater. After softening, the heater is removed, and the output end of the first hydraulic cylinder 8 shortens. By utilizing the cooperation between the pressing sealing mechanism 4 and the clamping and sealing mechanism 5, the bottom and side wall of the vacuum box 2 are sealed, resulting in a good sealing effect. After sealing, the vacuum pump connected to the blister mold body 3 is started to perform blister forming. After cooling and forming, the clamping and sealing mechanism 5 releases the clamping of the product and removes the product.

[0030] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A vacuum sealing structure for thermoforming molds, comprising a base plate (1), characterized in that: A vacuum box (2) is fixedly connected to the top of the base plate (1). A vacuum forming mold body (3) is installed inside the vacuum box (2). A sealing mechanism (4) is provided on the vacuum box (2). A hydraulic cylinder (8) is fixedly connected to the rear side of the top of the base plate (1). A fixed fork plate (6) is fixedly connected to the top of the output end of the hydraulic cylinder (8). A fixed frame (7) is fixedly installed on the front side of the fixed fork plate (6). A clamping sealing mechanism (5) is provided on the fixed frame (7). The sealing mechanism (4) includes a limiting groove (48) on the top of the vacuum box (2), and a first sealing groove (42) and a second sealing groove (43) are respectively opened at the bottom of the limiting groove (48). Fixed sleeves (47) are fixedly connected to the four side walls of the vacuum box (2), and movable rods (46) slide through the center of each of the four fixed sleeves (47). After the movable rod (46) slides through the vacuum box (2) near the center, a sealing strip (41) is fixedly connected. A guide groove is opened at the top of the sealing strip (41). A stop block (44) is fixedly sleeved in the middle of the movable rod (46). A first spring (45) is sleeved on the outside of the middle of the movable rod (46). The first spring (45) is located between the stop block (44) and the fixed sleeve (47).

2. The vacuum sealing structure for thermoforming molds according to claim 1, characterized in that: The vacuum forming mold body (3) has several suction holes, and the suction holes are connected to a vacuum pump through pipes.

3. The vacuum sealing structure for thermoforming molds according to claim 1, characterized in that: The clamping and sealing mechanism (5) includes a drive clamping assembly (51) and a movable frame (52). The drive clamping assembly (51) includes a cross-shaped fixing plate (517) fixedly connected to the middle of the fixed frame (7). A second hydraulic cylinder (512) is fixedly connected to the top center of the cross-shaped fixing plate (517). A cross-shaped movable plate (511) is fixedly connected to the top of the output end of the second hydraulic cylinder (512). Four guide rods (513) are fixedly connected to the bottom of the cross-shaped movable plate (511). A first fixed ear plate (514) is slidably sleeved in the middle of each of the four guide rods (513).

4. The vacuum sealing structure for thermoforming molds according to claim 3, characterized in that: The four first fixed ear plates (514) are respectively fixedly connected to the four side walls of the fixed frame (7), and the bottom of the guide rod (513) is fixedly connected to the second fixed ear plate (516). The four second fixed ear plates (516) are all fixedly connected to the movable frame (52).

5. The vacuum sealing structure for thermoforming molds according to claim 4, characterized in that: The guide rod (513) is fitted with a second spring (515) at its lower part, and the second spring (515) is located between the first fixed ear plate (514) and the second fixed ear plate (516).

6. The vacuum sealing structure for thermoforming molds according to claim 4, characterized in that: The movable frame (52) is fixedly fitted with a side wall sealing ring (53), and a guide groove is provided at the bottom of the side wall sealing ring (53). A first bottom sealing ring (54) and a second bottom sealing ring (55) are fixedly connected to the bottom of the movable frame (52), and the bottoms of the first bottom sealing ring (54) and the second bottom sealing ring (55) are both arc-shaped.

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