Film tension detecting and adjusting mechanism for V-method casting

Abstract

The utility model discloses a film tension detecting and adjusting mechanism for V-method casting, which is applied to the technical field of V-method casting and comprises a first cross rod and a second cross rod which are symmetrically arranged, threaded rods are rotatably connected to the interiors of the first cross rod and the second cross rod, and threaded rings are connected to the surfaces of the threaded rods in a threaded and sleeved mode. The stretching plates are pressed on the four edges of the thin film and slide at the bottoms of the first transverse rods and the second transverse rods, so that the stretching plates stretch the four edges of the thin film. When the tension of the thin film is large, the four edges of the thin film can slide inwards, then the surface tension of the thin film is reduced, and the thin film is prevented from cracking. Sliding adjustment can be conducted through the first transverse rod and the second transverse rod, so that the first transverse rod and the second transverse rod expand outwards or contract inwards. And therefore, adjustment can be conveniently carried out according to the size of the film, the stretching plate can be pressed on the tops of the films of different sizes for tension adjustment, and practicability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of V-process casting technology, and specifically relates to a thin film tension detection and adjustment mechanism for V-process casting. Background Technology

[0002] The V-process casting works by sealing the sand box with a plastic film and using a vacuum pump to extract air from the mold cavity, creating a pressure difference between the inside and outside of the mold. This pressure difference causes the dry sand to compact, forming the required cavity. Finally, vacuuming, core setting, mold closing, and pouring are performed.

[0003] Currently, Chinese utility model patent CN215090556U discloses a film end fixing device for V-process casting. In existing V-process casting, a vacuum pump is needed to extract air from the mold cavity. Because the inner wall area of ​​the sand box cavity is relatively large, the film adheres to the inner wall of the sand box cavity during vacuuming, causing the film to stretch. Simultaneously, since the four sides of the film are fixed and cannot be adjusted, this stretching increases the surface tension of the film, making it prone to cracking, reducing the film's sealing performance, and preventing effective adhesion of the film to the inner wall of the sand box cavity in some areas, thus causing sand leakage. Utility Model Content

[0004] The purpose of this invention is to provide a thin film tension detection and adjustment mechanism for V-process casting, which has the advantage of being applicable to tension adjustment of thin films of various sizes.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a thin film tension detection and adjustment mechanism for V-process casting, comprising two symmetrically arranged first crossbars and second crossbars, each of which is rotatably connected to a threaded rod, the surface of which is threaded with a threaded ring, a tension plate welded to the bottom of the threaded ring, and a limiting slider welded to the top of the threaded ring, which is slidably connected to the interior of the first crossbar and the second crossbar respectively, and a support block is bolted to the bottom of the first crossbar and the second crossbar at opposite ends.

[0006] The above technical solution involves pressing a stretching plate against the four sides of the film and sliding it at the bottom of the first and second crossbars, thus stretching the film's four sides. This adjusts the film's tension; when the film tension is high, the four sides can slide inwards, reducing surface tension and preventing cracking. The first and second crossbars can be adjusted by sliding, allowing them to expand outwards or contract inwards. This facilitates adjustment based on film size, enabling the stretching plate to be pressed onto films of various sizes for tension adjustment, thus improving practicality.

[0007] The present invention is further configured such that: both ends of the first crossbar and the second crossbar are provided with sliding grooves, both ends of the first crossbar and the second crossbar are provided with connecting blocks, and the side of the connecting blocks near the first crossbar and the second crossbar is welded with an extension rod that is slidably connected to the sliding groove; the top of both ends of the first crossbar and the second crossbar are threadedly connected with limiting bolts that are engaged with the extension rods.

[0008] The above technical solution facilitates adjustment according to the size of the film, allowing the stretching plate to be pressed on top of films of various sizes for tension adjustment.

[0009] The present invention is further configured such that a limiting disc welded to the threaded rod is provided on the side of the first crossbar and the second crossbar that are close to each other.

[0010] By adopting the above technical solution, the sliding distance of the threaded ring is limited to prevent the threaded ring from sliding off the surface of the threaded rod.

[0011] The present invention is further configured such that: a rotating disk is welded to one end of the threaded rod away from the limiting plate, which is rotatably connected to the first crossbar and the second crossbar respectively.

[0012] The above technical solution facilitates the transmission of power by rotating the rotating disk to drive the threaded rod to rotate and engage with the threaded ring.

[0013] The present invention is further configured such that: an anti-slip pad is adhered to the bottom of the stretching plate, and a tension sensor is bolted to the bottom of the stretching plate.

[0014] By adopting the above technical solution, the tension of the film can be detected when the stretching plate stretches the edge of the film, which facilitates precise control and adjustment of the film stretching distance.

[0015] The present invention is further configured such that each of the two second crossbars has a hanging lug welded to its top.

[0016] Using the above technical solution, the first and second crossbars can be lifted to the top of the sand box using lifting lugs to adjust the tension of the membrane, thus facilitating installation and disassembly.

[0017] The present invention is further configured such that: a return spring is bolted to the end of the extension rod away from the connecting block and fixedly connected to the inside of the slide groove.

[0018] By adopting the above technical solution, when the extension rod slides outward in the slide groove, it can drive the return spring to stretch, thereby preventing the extension rod from slipping out of the slide groove. At the same time, after rotating and loosening the limit bolt, the return spring can be used to quickly reset the extension rod.

[0019] In summary, this utility model has the following beneficial effects:

[0020] 1. By pressing a stretching plate against the four sides of the film and sliding it at the bottom of the first and second crossbars, the stretching plate stretches the four sides of the film. This adjusts the tension of the film; when the film tension is high, the four sides of the film can slide inward, thereby reducing the surface tension of the film and preventing it from cracking.

[0021] 2. The first and second crossbars can be slidably adjusted, allowing them to expand outwards or contract inwards. This facilitates adjustment based on the film size, enabling the stretching plate to be pressed onto the top of films of various sizes for tension adjustment, thus improving practicality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a sectional view of the second crossbar structure of this utility model;

[0024] Figure 3 This is a cross-sectional view of the first crossbar structure of this utility model.

[0025] Reference numerals in the attached drawings: 1. First crossbar; 2. Second crossbar; 3. Threaded rod; 4. Threaded ring; 5. Tension plate; 6. Support block; 7. Slide groove; 8. Connecting block; 9. Extension rod; 10. Limiting bolt; 11. Limiting disc; 12. Rotating disc; 13. Anti-slip pad; 14. Tension sensor; 15. Lifting lug; 16. Limiting slider; 17. Return spring. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1:

[0028] refer to Figure 1 , Figure 2A thin film tension detection and adjustment mechanism for V-process casting includes two symmetrically arranged first crossbars 1 and second crossbars 2. Both crossbars 1 and 2 are internally connected to threaded rods 3. Threaded rings 4 are threaded onto the surface of each threaded rod 3. A tension plate 5 is welded to the bottom of the threaded ring 4, and a limiting slider 16 is welded to the top of the threaded ring 4, which is slidably connected to the interior of both the first crossbar 1 and the second crossbar 2. Support blocks 6 are bolted to the ends of both the first crossbar 1 and the second crossbar 2 that are far apart from each other. By pressing the tension plate 5 against the four sides of the thin film and sliding it at the bottom of the first crossbar 1 and the second crossbar 2, the tension plate 5 stretches the four sides of the thin film. This adjusts the film tension; when the film tension is high, the four sides of the film can slide inwards, thereby reducing the surface tension of the film and preventing it from cracking.

[0029] refer to Figure 1 , Figure 2 A limiting disc 11, welded to the threaded rod 3, is provided on the side of the first crossbar 1 and the second crossbar 2 that are close to each other. This limits the sliding distance of the threaded ring 4 and prevents the threaded ring 4 from sliding off the surface of the threaded rod 3.

[0030] refer to Figure 1 , Figure 2 The end of the threaded rod 3 furthest from the limiting plate 11 is welded with a rotating disk 12 that is rotatably connected to the first crossbar 1 and the second crossbar 2. This facilitates the rotation of the threaded rod 3 by rotating the rotating disk 12 to engage with the threaded ring 4 for transmission.

[0031] refer to Figure 1 , Figure 2 Each of the two second crossbars 2 has a lifting lug 15 welded to its top. The lifting lug 15 can be used to lift the first crossbar 1 and the second crossbar 2 to the top of the sand box to adjust the tension of the membrane, thus facilitating installation and disassembly.

[0032] Brief description of the usage process: Using the lifting lugs 15, the first crossbar 1 and the second crossbar 2 are respectively hoisted to the top of the sand box, so that the stretching plates 5 at the bottom of the two first crossbars 1 and the two second crossbars 2 press against the top of the four sides of the film. Then, the support blocks 6 support the first crossbars 1 and the second crossbars 2, ensuring that they are positioned on top of the sand box without contacting it. Next, by twisting the threaded rod 3 to rotate and engage with the threaded ring 4, the threaded ring 4, under the limit of the limiting slider 16, drives the stretching plates 5 to slide at the bottom of the two first crossbars 1 and the two second crossbars 2, stretching the four sides of the film and adjusting the film tension.

[0033] Example 2:

[0034] refer to Figure 1 , Figure 3A film tension detection and adjustment mechanism for V-process casting includes a sliding groove 7 at both ends of a first crossbar 1 and a second crossbar 2, and a connecting block 8 at both ends of each crossbar 1 and the second crossbar 2. An extension rod 9, slidably connected to the sliding groove 7, is welded to the side of each connecting block 8 closest to the first crossbar 1 and the second crossbar 2. A limiting bolt 10, threaded through the top of each end of the first crossbar 1 and the second crossbar 2 and engaging with the extension rod 9, is threaded through them. The first crossbar 1 and the second crossbar 2 can be slidably adjusted, allowing them to expand outwards or contract inwards. This facilitates adjustment according to the size of the film, enabling the tension plate 5 to be pressed onto the top of films of various sizes for tension adjustment, thus improving practicality.

[0035] refer to Figure 1 , Figure 3 An anti-slip pad 13 is adhered to the bottom of the stretching plate 5, and a tension sensor 14 is bolted to the bottom of the stretching plate 5. This allows for the detection of film tension while the stretching plate 5 stretches the film edge, facilitating precise control and adjustment of the film stretching distance.

[0036] refer to Figure 3 The end of the extension rod 9 furthest from the connecting block 8 is bolted with a return spring 17 that is fixedly connected to the inside of the slide groove 7. When the extension rod 9 slides outward in the slide groove 7, it can drive the return spring 17 to stretch, thereby preventing the extension rod 9 from slipping out of the slide groove 7. At the same time, after rotating and loosening the limit bolt 10, the rebound force of the return spring 17 can be used to quickly reset the extension rod 9.

[0037] Brief description of the usage process: By rotating the limiting bolts 10 at both ends of the first crossbar 1 or the second crossbar 2, the limiting bolts 10 are moved upward away from the extension rod 9. This allows the extension rod 9 to slide inside the slide groove 7 by pulling the connecting blocks 8 on both sides, enabling the first crossbar 1 or the second crossbar 2 to slide and adjust its position according to the dimensions of the four sides of the film. Then, by rotating the limiting bolts 10 in the opposite direction, the limiting bolts 10 are moved downward, and the threaded engagement friction force secures the extension rod 9 inside the slide groove 7, thereby limiting and fixing the first crossbar 1 and the second crossbar 2.

[0038] 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.

Claims

1. A film tension detection and adjustment mechanism for V-process casting, comprising two symmetrically arranged first cross bars (1) and second cross bars (2), characterized in that: The first crossbar (1) and the second crossbar (2) are both rotatably connected to threaded rods (3). The surface of the threaded rod (3) is threaded with a threaded ring (4). A tension plate (5) is welded to the bottom of the surface of the threaded ring (4). A limiting slider (16) is welded to the top of the surface of the threaded ring (4) and is slidably connected to the inside of the first crossbar (1) and the second crossbar (2). A support block (6) is bolted to the bottom of the first crossbar (1) and the second crossbar (2) at opposite ends.

2. The film tension detection and adjustment mechanism for V-process casting according to claim 1, characterized in that: Both ends of the first crossbar (1) and the second crossbar (2) are provided with sliding grooves (7), and both ends of the first crossbar (1) and the second crossbar (2) are provided with connecting blocks (8). The side of the connecting block (8) close to the first crossbar (1) and the second crossbar (2) is welded with an extension rod (9) that is slidably connected to the sliding groove (7). The top of both ends of the first crossbar (1) and the second crossbar (2) are threadedly connected with limiting bolts (10) that are engaged with the extension rods (9).

3. The film tension detection and adjustment mechanism for V-process casting according to claim 1, characterized in that: A limiting plate (11) welded to the threaded rod (3) is provided on the side of the first crossbar (1) and the second crossbar (2) that are close to each other.

4. The film tension detection and adjustment mechanism for V-process casting according to claim 3, characterized in that: The threaded rod (3) has a rotating disk (12) welded to one end away from the limiting disk (11), which is rotatably connected to the first crossbar (1) and the second crossbar (2).

5. The film tension detection and adjustment mechanism for V-process casting according to claim 1, characterized in that: The bottom of the tension plate (5) is bonded with an anti-slip pad (13), and the bottom of the tension plate (5) is bolted with a tension sensor (14).

6. The film tension detection and adjustment mechanism for V-process casting according to claim 1, characterized in that: The top of each of the two second crossbars (2) is welded with a lug (15).

7. The film tension detection and adjustment mechanism for V-process casting according to claim 2, characterized in that: The end of the extension rod (9) away from the connecting block (8) is bolted with a return spring (17) that is fixedly connected inside the slide groove (7).

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