Height-adjustable pressing device

Abstract

The utility model discloses a height-adjustable hold-down device which comprises an oil cylinder, a piston rod of the oil cylinder is fixedly sleeved with a pressing plate, the other side of the pressing plate is rotatably provided with a fine adjustment threaded rod, and the top of the fine adjustment threaded rod is provided with a first locking nut; the pressing plate is subjected to rough adjustment and fine adjustment through the piston rod and the fine adjustment threaded rod on the oil cylinder, long-distance rough adjustment is achieved through stretching and retracting of the piston rod on the oil cylinder, and short-distance fine adjustment is achieved by screwing in the fine adjustment threaded rod. Besides, a first locking nut is arranged to lock the adjusted fine adjustment threaded rod, the stability of the device is guaranteed, and the technical problem that in the prior art, a pressing device cannot achieve height adjustment while achieving pressing is solved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing, specifically a height-adjustable clamping device. Background Technology

[0002] In industrial production, workpiece clamping is crucial. For example, it ensures parts are stable for precise cutting during machining and guarantees accurate component positioning during assembly. Traditional clamping devices have many limitations. Common ones are either fixed in height, requiring frequent replacement of clamping plates for workpieces of different thicknesses, which is time-consuming and labor-intensive; or they have simple adjustment functions, but the adjustment accuracy is low and the locking is unreliable, making them prone to loosening under machining vibration and other conditions, affecting machining quality and efficiency.

[0003] As the manufacturing industry develops towards higher precision and higher efficiency, higher requirements are placed on clamping devices. They must be able to achieve reliable clamping through a powerful power source such as a hydraulic cylinder, and after locking, they must be able to flexibly and accurately adjust the height to adapt to a variety of workpieces. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a height-adjustable clamping device to solve the technical problem that the existing clamping device cannot achieve height adjustment at the same time as clamping.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A height-adjustable clamping device includes a hydraulic cylinder, a pressure plate fixedly sleeved on the piston rod of the hydraulic cylinder, a fine-adjusting threaded rod rotatably provided on the other side of the pressure plate, and a locking nut No. 1 provided on the top of the fine-adjusting threaded rod.

[0007] This utility model also includes the following technical features:

[0008] The pressure plate has a mounting hole, in which the piston rod is installed. The end of the piston rod extends out of the mounting hole and is fitted with a second locking nut.

[0009] A first arc-shaped groove is provided on the outer wall of the piston rod, and a second arc-shaped groove is provided on the inner wall of the mounting hole. The first arc-shaped groove and the second arc-shaped groove form a cylindrical cavity, and a positioning pin is provided in the cylindrical cavity.

[0010] The ratio of the cross-sectional area of ​​the first arc-shaped groove to the cross-sectional area of ​​the second arc-shaped groove is 1:3.

[0011] The thickness of the front side of the pressure plate is less than the thickness of the rear side of the pressure plate.

[0012] A threaded hole is provided on the other side of the pressure plate, and the fine-tuning thread rod is provided in the threaded hole.

[0013] Compared with the prior art, the beneficial technical effects of this utility model are:

[0014] (I) In this utility model, the pressure plate is coarsely adjusted and finely adjusted by the piston rod on the oil cylinder and the fine adjustment threaded rod respectively. The extension and retraction of the piston rod on the oil cylinder realizes long-distance coarse adjustment, and the fine adjustment threaded rod realizes short-distance fine adjustment. In addition, a locking nut is set to lock the fine adjustment threaded rod after adjustment, which ensures the stability of the device and solves the technical problem that the pressing device in the prior art cannot achieve height adjustment at the same time as pressing.

[0015] (II) In this utility model, one end of the fine adjustment threaded rod set in the threaded hole of the pressure plate rests against the fixed reference surface. By rotating the fine adjustment threaded rod and changing the screw length, the height of the pressure plate can be finely adjusted, so that the pressure plate can adapt to different workpiece thickness requirements.

[0016] (III) In this utility model, the fit between the positioning pin and the cylindrical cavity formed by the first arc-shaped groove and the second arc-shaped groove ensures that the pressure plate is highly stable during operation and will not loosen even when subjected to vibration or external impact, thus ensuring that the workpiece is always reliably pressed. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional view of the pressure plate in the middle.

[0019] The meanings of the labels in the diagram are as follows: 1. Cylinder; 2. Piston rod; 3. Pressure plate; 4. Fine adjustment threaded rod; 5. No. 1 locking nut; 6. Mounting hole; 7. No. 2 locking nut; 8. First arc groove; 9. Second arc groove; 10. Positioning pin; 11. Threaded hole.

[0020] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, all components in this utility model are components known in the art.

[0022] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0023] This utility model provides a height-adjustable clamping device, including a hydraulic cylinder 1, a pressure plate 3 fixedly sleeved on the piston rod 2 of the hydraulic cylinder 1, a fine-adjusting threaded rod 4 rotatably provided on the other side of the pressure plate 3, and a first locking nut 5 provided on the top of the fine-adjusting threaded rod 4.

[0024] In the above technical solution, the piston rod 2 and the fine-adjusting threaded rod 4 on the hydraulic cylinder 1 are used to coarsely adjust and finely adjust the pressure plate 3, respectively. The extension and retraction of the piston rod 2 on the hydraulic cylinder 1 achieves long-distance coarse adjustment, while the fine-adjusting threaded rod 4 is screwed in to achieve short-distance fine adjustment. In addition, a locking nut 5 is set to lock the fine-adjusting threaded rod 4 after adjustment, ensuring the stability of the device and solving the technical problem that the pressing device in the prior art cannot achieve height adjustment at the same time as pressing.

[0025] Preferably, the pressure plate 3 is made of high-strength metal material, has a shape that fits common workpieces, and has sufficient rigidity to transmit clamping force.

[0026] The pressure plate 3 has a mounting hole 6, a piston rod 2 is installed in the mounting hole 6, the end of the piston rod 2 extends out of the mounting hole 6, and a second locking nut 7 is installed thereon.

[0027] In the above technical solution, the pressure plate 3 and the piston rod 2 are fixed by the second locking nut 7.

[0028] A first arc-shaped groove 8 is provided on the outer wall of the piston rod 2, and a second arc-shaped groove 9 is provided on the inner wall of the mounting hole 6. The first arc-shaped groove 8 and the second arc-shaped groove 9 form a cylindrical cavity, and a positioning pin 10 is provided in the cylindrical cavity.

[0029] In the above technical solution, the fit between the positioning pin 10 and the cylindrical cavity formed by the first arc-shaped groove 8 and the second arc-shaped groove 9 ensures that the pressure plate 3 is highly stable during operation and will not loosen even when subjected to vibration or external impact, thus ensuring that the workpiece is always reliably pressed.

[0030] The ratio of the cross-sectional area of ​​the first arc-shaped groove 8 to the second arc-shaped groove 9 is 1:3.

[0031] In the above technical solutions, critical components are often key parts of the entire structure or mechanism, bearing the main loads and forces. In this solution, piston rod 2 is a critical component. Designing the cross-sectional area of ​​the locating pin on piston rod 2 to be relatively small allows the structure of piston rod 2 to remain as intact as possible, reducing the weakening of its strength and rigidity due to pin holes, etc., and enabling it to better perform its main load-bearing function. Pressure plate 3 may mainly play an auxiliary, connecting, or positioning role. Appropriately increasing the cross-sectional area of ​​the locating pin on it can share some of the shear force, reducing the localized stress on critical components.

[0032] Furthermore, this cross-sectional area ratio design allows for a more reasonable distribution of the force on the locating pin 10 between the two parts. Allowing the pressure plate 3 to bear a relatively larger force results in a more even distribution of the force on the piston rod 2, preventing stress concentration in localized areas of critical components and improving the overall structural stability and reliability.

[0033] Increasing the mating area of ​​the locating pin on the pressure plate makes machining relatively easier and allows for a more relaxed requirement for machining accuracy. However, the piston rod 2 typically has higher requirements for dimensional accuracy and geometric tolerances. A smaller mating area for the locating pin 10 means that precision can be better controlled during machining, reducing the impact of machining errors on overall performance.

[0034] The larger cross-sectional area of ​​the locating pin 10 on the pressure plate 3 helps to quickly guide the locating pin into the correct position during assembly, playing a certain guiding role, reducing assembly difficulty, and improving assembly efficiency.

[0035] The thickness of the front side of the pressure plate 3 is less than the thickness of the rear side of the pressure plate 3.

[0036] The above technical solution is described from three aspects: functional requirements, process and manufacturing, and structure and mechanics.

[0037] Functional requirements:

[0038] (1) The thinner front section makes it easier for the pressure plate 3 to be aligned and inserted when it comes into contact with the workpiece or the object being pressed, which plays a good guiding role and makes it easy to be placed accurately in the position that needs to be pressed. The thicker rear section provides better stability and support, ensuring that the pressure plate 3 will not shift during the pressing process.

[0039] (2) Pressure distribution and adjustment: When the pressure plate 3 is working, different pressures are usually applied to different parts. The thinner front part can provide less pressure at the initial contact to avoid excessive squeezing or damage to the workpiece surface. As the pressure plate 3 is pressed down, the thicker rear part gradually plays its role to provide greater pressure in order to achieve a good clamping effect.

[0040] In terms of technology and manufacturing:

[0041] (1) Material saving and cost control: Under the premise of meeting the usage requirements, the front section of the pressure plate 3 is designed to be thinner, which can reduce the amount of material used and thus reduce production costs. Especially for some large or batch-produced pressure plates 3, the material cost savings will be more significant.

[0042] (2) Ease of processing: Manufacturing a pressure plate 3 that is thin at the front and thick at the rear may be easier in terms of processing technology. For example, in the casting or forging process, this shape of pressure plate 3 is easier to demold or form, reducing the difficulty of the process and the probability of defects. In machining, the amount of cutting can also be reduced, and the processing efficiency can be improved.

[0043] In terms of structure and mechanics:

[0044] (1) Enhanced structural stability: The thicker rear end of the pressure plate 3 increases its overall structural strength and stability, making it less prone to deformation or breakage when subjected to greater pressure. The thinner front end does not significantly affect the overall structural stability and can also meet some special usage requirements, such as matching with workpieces of specific shapes.

[0045] (2) Adapting to different stress conditions: During the use of pressure plate 3, the rear end is usually the main stress-bearing part, which needs to withstand the action of the clamping device or other external forces. A thicker rear end can better disperse and transmit these forces, avoid stress concentration, and improve the service life of pressure plate 3.

[0046] A threaded hole 11 is provided on the other side of the pressure plate 3, and a fine-tuning thread rod 4 is provided in the threaded hole.

[0047] In the above technical solution, one end of the fine adjustment threaded rod 4 set in the threaded hole 11 of the pressure plate 3 rests against the fixed reference surface. By rotating the fine adjustment threaded rod 4 and changing the screw length, the height of the pressure plate 3 can be finely adjusted, allowing the pressure plate 3 to adapt to different workpiece thickness requirements.

Claims

1. A height adjustable compression device, characterized in that, Includes a hydraulic cylinder (1), on which a pressure plate (3) is fixedly sleeved on the piston rod (2) of the hydraulic cylinder (1), and a fine-adjusting threaded rod (4) is rotatably provided on the other side of the pressure plate (3), and a first locking nut (5) is provided on the top of the fine-adjusting threaded rod (4).

2. The height-adjustable hold-down device according to claim 1, characterized in that The pressure plate (3) has an installation hole (6), the piston rod (2) is installed in the installation hole (6), the end of the piston rod (2) extends out of the installation hole (6) and is fitted with a second locking nut (7).

3. The height adjustable hold down device of claim 2, wherein, The piston rod (2) has a first arc-shaped groove (8) on its outer side wall and a second arc-shaped groove (9) on its inner side wall. The first arc-shaped groove (8) and the second arc-shaped groove (9) form a cylindrical cavity, in which a positioning pin (10) is provided.

4. The height adjustable hold down device of claim 3, wherein, The ratio of the cross-sectional area of ​​the first arc-shaped groove (8) and the second arc-shaped groove (9) is 1:

3.

5. The height adjustable hold down device of claim 1 wherein, The thickness of the front side of the pressure plate (3) is less than the thickness of the rear side of the pressure plate (3).

6. The height adjustable hold down device of claim 1 wherein, A threaded hole (11) is provided on the other side of the pressure plate (3), and the fine adjustment thread rod (4) is provided in the threaded hole.

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