Negative-pressure elastic blister sheet fixing frame

Abstract

The utility model discloses a negative pressure elastic blister sheet fixing frame, and belongs to the field of blister equipment accessories, an air suction movable groove is connected with an elastic frame in a sliding mode in the height direction, a compression spring is arranged between the top of the elastic frame and the top of the air suction movable groove, and an adjusting piece is arranged between the elastic frame and a frame body. Air suction holes are evenly distributed in the bottom of the elastic frame, an air suction cavity is formed between the frame body and the elastic frame, the air suction holes are communicated with the air suction cavity, and an air path quick connector communicated with the air suction cavity is formed in the frame body. The distance, protruding out of the bottom of the frame body, of the bottom of the elastic frame is adjusted through the height adjusting piece, flatness is guaranteed, the sealing effect is improved, meanwhile, the pre-tightening force of the compression spring is changed, and the suction force of negative pressure at the air suction opening is utilized to adapt to plastic suction sheets of different thicknesses or materials.

Description

Technical Field

[0001] This utility model relates to accessories for vacuum forming equipment, and in particular to a negative pressure elastic vacuum forming sheet fixing frame. Background Technology

[0002] Vacuum forming is a type of thermoplastic forming process. It mainly uses the vacuum suction force generated by a vacuum pump to mold heated and softened thermoplastic sheets such as PVC, PET, and PP into various shapes. It is the core component in vacuum forming to ensure the positioning and shaping of the sheet. Depending on the vacuum forming production line or vacuum forming equipment, the sheet fixing frame has different structures.

[0003] For example, in the prior art, the utility model patent with application number "CN201922064103.5" discloses a plastic sheet fixing device for a vacuum forming machine, which solves the functions of sealing and clamping the sheet through an overlapping frame structure. For continuous production lines, generally only the edge position of the continuous vacuum forming sheet under the vacuum forming station is sealed and fixed. Usually, the clamping and fixing is achieved by pressing in the height direction, and the pressing of the rubber parts plays a sealing role. However, during continuous production, the rubber parts of the fixing frame are worn, resulting in a deterioration of the clamping and sealing effect at the contact position. Utility Model Content

[0004] The purpose of this invention is to provide a negative pressure blister sheet fixing frame, which has the advantage of adjusting the contact force of the rubber parts, thereby improving the clamping and sealing effects.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a negative pressure elastic blister sheet fixing frame, comprising a frame body, a suction groove provided at the bottom of the frame body, the suction groove being recessed upward along the thickness direction of the frame body, an elastic frame slidably connected to the suction groove in the height direction, a compression spring provided between the top of the elastic frame and the top of the suction groove, an adjusting member provided between the elastic frame and the frame body, the compression spring being concentrically arranged with the adjusting member, the adjusting member adjusting the distance between the top of the elastic frame and the top of the suction groove, the adjusting member being evenly distributed along the length direction of the frame body, suction holes evenly distributed at the bottom of the elastic frame, a suction chamber provided between the frame body and the elastic frame, the suction holes communicating with the suction chamber, and a quick air passage interface communicating with the suction chamber provided on the frame body.

[0006] Preferably, the frame includes an outer frame and an inner frame, which are located on both sides of the air intake groove. A stepped groove is provided on the outer side of the top of the inner frame, which surrounds the inner frame and is connected to the inner side of the outer frame.

[0007] By adopting the above technical solution, it is convenient to install the elastic frame inside the frame and the height adjustment component.

[0008] Preferably, a sealing groove is provided at the position where the outer frame mates with the step groove, and an elastic sealing ring is provided in the sealing groove.

[0009] By adopting the above technical solution, the elastic sealing ring improves the sealing effect between the outer frame and the inner frame.

[0010] Preferably, a hollow bolt is provided between the outer frame and the inner frame. A second threaded hole is provided through the outer frame and threadedly connected to the end of the hollow bolt. A first threaded hole is provided through the inner frame and threadedly connected to the front end of the hollow bolt. An air intake stroke hole that mates with the hollow bolt is provided through the elastic frame. The air intake stroke hole extends along the height direction of the elastic frame and communicates with the air intake chamber and the air intake hole respectively. The second threaded hole is threadedly connected to the quick air interface.

[0011] By adopting the above technical solution, the hollow bolt serves as a connector between the inner and outer frames, an air passage for the air intake chamber, and a guide for the lifting and lowering of the elastic frame.

[0012] Preferably, the outer side of the inner frame is provided with a side blind hole for the head end of the hollow bolt to mate with, and the head end of the hollow bolt is located in the side blind hole.

[0013] By adopting the above technical solution, interference at the head end of the hollow bolt can be avoided during the vacuum forming process.

[0014] Preferably, the hollow bolt includes a first through hole and a second through hole. The first through hole is concentrically arranged with the hollow bolt and extends through the tail end of the hollow bolt. The first through hole is closed at the head end of the hollow bolt, and the second through hole extends through the hollow bolt radially.

[0015] By adopting the above technical solution, the specific structure of the hollow bolt is disclosed. The first through hole and the second through hole serve as longitudinal and transverse airflow channels, respectively, to ensure that gas enters the intake chamber from the intake hole.

[0016] Preferably, the height adjustment component includes an adjustment bolt and an adjustment nut, the compression spring is sleeved on the adjustment bolt, the top of the suction stroke hole is recessed upward to form a top blind hole, the top blind hole penetrates the elastic frame along the height direction to form a third through hole, the top blind hole is provided for the end of the adjustment bolt, the outer frame is provided with a third threaded hole that mates with the adjustment bolt, and the adjustment nut is located at the top of the outer frame and is threadedly connected to the end of the adjustment bolt.

[0017] By adopting the above technical solution, the flatness of the bottom of the elastic frame is adjusted by rotating the adjusting bolt to ensure consistent pressure.

[0018] Preferably, the top blind hole and the air intake hole are concentrically arranged, the diameter of the air intake hole is larger than the diameter of the end of the adjusting bolt, and the bottom of the air intake hole is inclined outward.

[0019] By adopting the above technical solution, the air intake hole allows the adjusting bolt to be installed into the top blind hole.

[0020] Preferably, the suction chamber includes a second threaded hole, a first through hole, a second through hole, a suction groove, a third through hole, and a suction hole.

[0021] By adopting the above technical solutions, a coherent negative pressure system is formed.

[0022] Preferably, the inner frame, outer frame, and elastic frame have rectangular cross-sectional shapes, and the inner frame and outer frame have elastic sealing layers at the bottom of both sides of the elastic frame in the width direction.

[0023] By adopting the above technical solutions, the sealing effect is improved and air leakage at the edges is prevented.

[0024] In summary, by adjusting the distance between the bottom of the elastic frame and the bottom of the frame body using the height adjustment component, flatness is ensured and the sealing effect is improved. At the same time, the preload of the compression spring is changed, and the suction force at the air intake position is utilized to adapt to blister sheets of different thicknesses or materials. Meanwhile, the cooperation between the elastic frame and the compression spring gives the elastic frame vertical flexibility, which adapts to slight unevenness on the surface of the sheet and reduces mechanical impact damage to the material. The air intake holes evenly distributed at the bottom of the elastic frame improve the suction effect on the sheet, thereby ensuring the clamping and sealing effect of the blister sheet fixing frame. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of an embodiment;

[0026] Figure 2 This is a top view of an embodiment;

[0027] Figure 3 This is a bottom view of an embodiment;

[0028] Figure 4 This is a schematic diagram of the hollow bolt in the embodiment;

[0029] Figure 5 This is a schematic diagram of the structure at the position of the suction stroke hole in the embodiment;

[0030] In the diagram, 1. Outer frame; 11. Second threaded hole; 12. Quick air interface; 13. Third threaded hole; 14. Elastic sealing layer; 2. Inner frame; 21. Step groove; 22. Sealing groove; 23. Elastic sealing ring; 24. First threaded hole; 25. Side blind hole; 3. Suction movement groove; 4. Elastic frame; 41. Suction stroke hole; 42. Top blind hole; 43. Third through hole; 5. Compression spring; 61. Adjusting bolt; 62. Adjusting nut; 7. Suction hole; 71. Hollow bolt; 72. First through hole; 73. Second through hole. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0033] Example:

[0034] like Figures 1 to 5 As shown, a negative pressure elastic thermoformed sheet fixing frame includes a frame body. To facilitate the installation of the internal structure and from a cost perspective, the frame body consists of two parts: an outer frame 1 and an inner frame 2. The size of the outer frame 1 is larger than that of the inner frame 2. The outer frame 1 and the inner frame 2 are rectangular. When the outer frame 1 and the inner frame 2 are spliced, a rectangular suction groove 3 is formed at the bottom. That is, the suction groove 3 is formed by recessing upward along the thickness direction of the frame body. In order to improve the sealing effect, the inner frame 2 and the outer frame 1 are provided with elastic sealing layers 14 made of rubber on both sides of the bottom of the elastic frame 4 in the width direction.

[0035] like Figure 2 As shown, the outer frame 1 and the inner frame 2 are located on both sides of the air intake groove 3. In order to ensure the sealing of the outer frame 1 and the inner frame 2, a stepped groove 21 is provided on the outer side of the top of the inner frame 2. The stepped groove 21 surrounds the inner frame 2 and is connected to the inner side of the outer frame 1. A sealing groove 22 is provided at the mating position of the outer frame 1 and the stepped groove 21. An elastic sealing ring 23 is provided in the sealing groove 22.

[0036] like Figures 1 to 5As shown, the suction movable groove 3 is slidably connected to an elastic frame 4 in the height direction. The elastic frame 4 is made of rubber material, and a compression spring 5 is provided between the top of the elastic frame 4 and the top of the suction movable groove 3, causing the elastic frame 4 to protrude downwards from the bottom of the outer frame 1. To ensure the flatness of the bottom of the elastic frame 4, an adjusting component is provided between the elastic frame 4 and the frame. The compression spring 5 and the adjusting component are concentrically arranged. The adjusting component adjusts the distance between the top of the elastic frame 4 and the top of the suction movable groove 3, such as... Figure 1 and Figure 2 As shown, the adjusting components are evenly distributed along the length of the frame.

[0037] like Figure 1 and Figure 5 As shown, the specific structure of the height adjustment component includes an adjusting bolt 61 and an adjusting nut 62. A compression spring 5 is sleeved on the adjusting bolt 61. The top of the suction stroke hole 41 is recessed upward to form a top blind hole 42. The top blind hole 42 passes through the elastic frame 4 along the height direction to form a third through hole 43. The top blind hole 42 is provided for the end of the adjusting bolt 61. The outer frame 1 is provided with a third threaded hole 13 that mates with the adjusting bolt 61. The adjusting nut 62 is located at the top of the outer frame 1 and is threadedly connected to the end of the adjusting bolt 61. By rotating the adjusting nut 62, the movement of the elastic frame 4 in the height direction at this position can be controlled.

[0038] like Figure 1 As shown, in order to facilitate the installation of the adjusting bolt 61 from the bottom of the elastic frame 4, the top blind hole 42 and the air intake hole 7 are concentrically set, the diameter of the air intake hole 7 is larger than the diameter of the end of the adjusting bolt 61, and the bottom of the air intake hole 7 is set outward.

[0039] like Figures 1 to 5 As shown, the air passage structure of the frame and the elastic frame 4 is as follows: the air suction chamber includes a second threaded hole 11, a first through hole 72, a second through hole 73, an air suction groove 3, a third through hole 43, and an air suction hole 7. The bottom of the elastic frame 4 is evenly distributed with air suction holes 7. The air suction holes 7 are evenly distributed along the length of the frame. An air suction chamber is provided between the frame and the elastic frame 4. The air suction holes 7 are connected to the air suction chamber. The frame is provided with an air passage quick interface 12 that is connected to the air suction chamber, so that the air passage quick interface 12 can draw in air. The negative pressure is transmitted to the air suction hole 7 through the air suction chamber.

[0040] like Figure 1 and Figure 4As shown, the connection structure between the outer frame 1 and the inner frame 2 is as follows: a hollow bolt 71 is provided between the outer frame 1 and the inner frame 2. The hollow bolt 71 is also part of the air passage. A second threaded hole 11 is provided through the outer frame 1, which is threaded to the end of the hollow bolt 71. A first threaded hole 24 is provided through the inner frame 2, which is threaded to the front end of the hollow bolt 71. In order to prevent the end of the hollow bolt 71 from protruding from the inner surface of the inner frame 2 and thus affecting the vacuum forming process, a hollow bolt 71 is provided on the outer side of the inner frame 2. There is a side blind hole 25 for the head end of the hollow bolt 71 to mate with. The head end of the hollow bolt 71 is located in the side blind hole 25. An air intake stroke hole 41 that mates with the hollow bolt 71 is provided through the elastic frame 4. At the same time, the air intake stroke hole 41 extends along the height direction of the elastic frame 4, allowing the elastic frame 4 to move in the height direction. The air intake stroke hole 41 is part of the air intake chamber and communicates with the air intake hole 7. The second threaded hole 11 is threadedly connected to the air passage quick interface 12, that is, the second threaded hole 11 serves as the airflow outlet.

[0041] like Figure 4 As shown, the specific structure of the hollow bolt 71 is as follows: the hollow bolt 71 includes a first through hole 72 and a second through hole 73. The first through hole 72 is concentrically arranged with the hollow bolt 71 and is arranged through the tail end of the hollow bolt 71. The first through hole 72 is closed at the head end of the hollow bolt 71, and the second through hole 73 is arranged through the hollow bolt 71 radially.

[0042] Working principle:

[0043] On the automated production line, the quick air interface 12 is connected to a negative pressure air pipe. Under the action of the traction structure, the thermoforming roll passes under the frame. The frame moves downward, and the elastic frame 4 contacts the upper surface of the thermoforming roll. At the same time, the lower surface of the thermoforming roll contacts the track shown in the figure, clamping the thermoforming material. Simultaneously, the compression spring 5 is squeezed. The suction air passage applies negative pressure through the second threaded hole 11, the second through hole 73, the first through hole 72, and the suction movable groove 3 to the suction hole 7 and the adjacent suction hole 7, increasing the clamping force on the bottom thermoforming material. After the thermoforming is completed, the solenoid valve cuts off the air and moves the frame upward, causing the thermoforming roll to detach from the clamp.

Claims

1. A negative pressure elastic blister sheet fixing frame comprising a frame body, characterized in that: The bottom of the frame is provided with an air suction movable groove (3), which is recessed upward along the thickness direction of the frame, and the air suction movable groove (3) is slidably connected with an elastic frame (4) in the height direction, a compression spring (5) is arranged between the top of the elastic frame (4) and the top of the air suction movable groove (3), an adjusting piece is arranged between the elastic frame (4) and the frame, the compression spring (5) is arranged concentrically with the adjusting piece, the adjusting piece adjusts the distance between the top of the elastic frame (4) and the top of the air suction movable groove (3), the adjusting pieces are uniformly distributed along the length direction of the frame, the bottom of the elastic frame (4) is uniformly distributed with air suction holes (7), an air suction cavity is arranged between the frame and the elastic frame (4), the air suction holes (7) are communicated with the air suction cavity, and an air path quick connector (12) communicated with the air suction cavity is arranged on the frame.

2. The negative pressure elastic blister sheet fixing frame according to claim 1, wherein: The frame comprises an outer frame (1) and an inner frame (2), the outer frame (1) and the inner frame (2) are respectively located on the two sides of the air suction movable groove (3), the outer side of the top of the inner frame (2) is provided with a stepped groove (21), the stepped groove (21) is arranged around the inner frame (2), and the stepped groove (21) is connected with the inner side of the outer frame (1).

3. The negative pressure elastic blister sheet fixing frame according to claim 2, characterized in that: The outer frame (1) is provided with a sealing groove (22) at the matching position of the stepped groove (21), and the sealing groove (22) is provided with an elastic sealing ring (23) therein.

4. The negative pressure elastic blister sheet fixing frame according to claim 2, wherein: A hollow bolt (71) is arranged between the outer frame (1) and the inner frame (2), a second threaded hole (11) is arranged through the outer frame (1) and is threadedly connected with the tail end of the hollow bolt (71), a first threaded hole (24) is arranged through the inner frame (2) and is threadedly connected with the front end of the hollow bolt (71), an air suction stroke hole (41) is arranged through the elastic frame (4) and cooperates with the hollow bolt (71), the air suction stroke hole (41) extends along the height direction of the elastic frame (4), and the air suction stroke hole (41) is respectively communicated with the air suction cavity and the air suction hole (7).

5. The negative pressure elastic blister sheet fixing frame according to claim 4, wherein: The outer side of the inner frame (2) is provided with a side blind hole (25) for cooperating with the head end of the hollow bolt (71), and the head end of the hollow bolt (71) is located in the side blind hole (25).

6. The negative pressure elastic blister sheet fixing frame according to claim 4, wherein: The hollow bolt (71) comprises a first through hole (72) and a second through hole (73), the first through hole (72) is arranged concentrically with the hollow bolt (71), the first through hole (72) is arranged through the tail end of the hollow bolt (71), the first through hole (72) is closed at the head end of the hollow bolt (71), and the second through hole (73) is arranged through in the radial direction of the hollow bolt (71).

7. The negative pressure elastic blister sheet fixing frame according to claim 4, wherein: The adjusting member comprises an adjusting bolt (61) and an adjusting nut (62), the compression spring (5) is sleeved on the adjusting bolt (61), the top of the suction stroke hole (41) is concave upward to form a top blind hole (42), the top blind hole (42) forms a third through hole (43) along the height direction through the elastic frame (4), the end of the adjusting bolt (61) is arranged in the top blind hole (42), the outer frame body (1) is provided with a third threaded hole (13) matched with the adjusting bolt (61), and the adjusting nut (62) is located at the top of the outer frame body (1) and is threadedly connected with the end of the adjusting bolt (61).

8. The negative pressure elastic blister sheet fixing frame according to claim 7, characterized in that: The top blind hole (42) is concentrically arranged with the suction hole (7), the diameter of the suction hole (7) is greater than that of the end of the adjusting bolt (61), and the bottom of the suction hole (7) is outwardly inclined.

9. The negative pressure elastic blister sheet fixing frame according to claim 2, wherein: The inner frame body (2), the outer frame body (1) and the elastic frame (4) are rectangular in cross-sectional shape, and the inner frame body (2) and the outer frame body (1) are provided with elastic sealing layers (14) at the bottoms on both sides of the width direction of the elastic frame (4).

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