Hydraulic oil cylinder with pressing force adjusting function

Abstract

The invention discloses a hydraulic oil cylinder with a pressing force adjusting function. According to a hydraulic oil cylinder assembly, an end cover is fixed to the lower end of an oil cylinder body; the lower end of the pressing plate is rotatably fixed to the upper end of the piston rod, and the lower end of the pressing plate is rotatably fixed to the upper end of the oil cylinder body through two connecting rods. The upper and lower ends of the side surface of the oil cylinder body are respectively provided with an oil return port and an oil inlet; according to the pressing force adjusting assembly, two mounting holes are symmetrically formed in a connecting plate base, adjusting screws are fixed in the two mounting holes in an abutting mode, the upper end of a connecting plate is fixed to the upper end of a piston rod, and two spring mounting bases fixed to the upper end of an oil cylinder body are symmetrically arranged on the two sides of the upper end of the connecting plate; mounting blind holes are formed in the spring mounting seats, and spring pressing nails provided with belleville springs in a penetrating manner are mounted in the mounting blind holes; the upper end of the adjusting screw right faces the lower end of the spring pressing nail, the pressing plate is connected to a workpiece in a pressing mode, and the adjusting screw abuts against the spring pressing nail. The pressing force on the workpiece can be adjusted under the condition that the oil inlet pressure of hydraulic oil is not adjusted, and therefore the overall system pressure is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic oil cylinders and relates to a hydraulic oil cylinder with an adjustable pressing force function. Background Art

[0002] In mechanical processing, oil cylinders are often used to clamp workpieces for processing. When using oil cylinders to clamp parts with special structures, the parts may be deformed due to the structure of the parts themselves or the high system pressure, which affects the processing accuracy. The traditional solution is to reduce the pressure of the hydraulic system, thereby reducing the clamping force of the oil cylinder and reducing the deformation of the parts caused by the high clamping force. However, doing so will cause the overall system pressure to decrease, and the clamping force of all oil cylinders will be reduced at the same time, which will also affect the oil cylinders that do not need to be adjusted, and will have some uncertain effects on the processing of parts. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a hydraulic cylinder with an adjustable clamping force function, which can adjust the clamping force on the workpiece without adjusting the hydraulic oil inlet pressure, thereby not affecting the overall system pressure.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a hydraulic oil cylinder with adjustable pressing force function, comprising a hydraulic oil cylinder assembly and a pressing force adjustment assembly; The hydraulic cylinder assembly comprises a cylinder body, a piston rod, an end cover, a pressure plate, two connecting rods, a pin shaft I and a pin shaft II parallel to the pin shaft I; the end cover is sealed and embedded in the lower end of the cylinder body; the lower end of the pressure plate is rotatably fixed to the upper end of the piston rod through the pin shaft I, and its lower end is rotatably fixed with two symmetrically distributed connecting rods by a pin shaft II, and the other end of the connecting rod is rotatably fixed to the upper end of the cylinder body through another pin shaft II; the upper end of the side surface of the cylinder body is provided with an oil return port connected to the upper oil chamber, and the lower end is provided with an oil inlet connected to the lower oil chamber; The clamping force adjustment assembly includes a connecting plate, a spring mounting seat, a spring pressure pin, a butterfly spring, a baffle and an adjusting screw; the connecting plate is an inverted T-shape, and two mounting holes are symmetrically opened on its base, and the adjusting screws are fixed in the two mounting holes; the upper end of the connecting plate is fixed to the upper end of the piston rod, and two spring mounting seats are symmetrically arranged on both sides of its upper end; the two spring mounting seats are fixed to the upper end of the cylinder body, and both have mounting blind holes, and the two mounting blind holes are symmetrically distributed relative to the connecting plate; the spring pressure pin with a butterfly spring is installed in the mounting blind hole, and is fixed by the baffle fixed on the bottom surface of the spring mounting seat; the upper end of the adjusting screw is opposite to the lower end of the spring pressure pin, and after the piston rod rises to its position, the pressure plate is pressed on the workpiece, and the adjusting screw is pressed against the spring pressure pin.

[0005] Further preferably, a pressing block is fixed on the free end of the pressing plate on one side of the pressing workpiece; the shape of the pressing block matches the shape of the pressed workpiece, and the hardness of the material of the pressing block is less than the hardness of the pressed workpiece. In this way, the pressing block can be replaced to adapt to workpieces of different shapes and materials, and has a wide range of adaptability.

[0006] Further preferably, the specific structure of the adjusting screw being fixed in the two mounting holes of the base of the connecting plate is: a threaded hole is opened on the side of the base and vertically penetrates the two mounting holes, the adjusting screw is placed in the mounting hole, the fastening screw is threadedly connected in the threaded hole and connected to the adjusting screw and is locked and fixed by a locking nut. With this structure, the adjusting screw has high fixing reliability and is easy to disassemble and adjust.

[0007] Compared with the prior art, the beneficial effect of the present invention is that the present invention can adjust the clamping force on the workpiece without adjusting the hydraulic oil inlet pressure, thereby not affecting the overall system pressure. Therefore, there is no need to adjust the system pressure, only the oil cylinder that has a greater impact on the workpiece clamping is adjusted, thereby ensuring that the pressure of the oil cylinder that causes a greater deformation of the workpiece can be reduced, and the pressure of other oil cylinders can be kept unchanged, ensuring that the pressure of the oil cylinder that does not need to be adjusted does not change. Therefore, the present invention can be applied to the processing of complex structural parts, and can achieve that the same type of oil cylinder can produce different clamping forces under the same hydraulic source, providing us with a good method and guarantee for processing qualified products. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 for Figure 2 AA section view; Figure 4 A top view of the present invention; Figure 5 for Figure 4 BB cross-sectional view; Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention when it is in a compressed state. DETAILED DESCRIPTION

[0009] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] like Figure 1 and Figure 6As shown, this embodiment includes a hydraulic cylinder assembly and a clamping force adjustment assembly. The hydraulic cylinder assembly includes a cylinder body 1, a piston rod 2, an end cover 3, a pressure plate 4, two connecting rods 5, a pin shaft Ⅰ6 and a pin shaft Ⅱ7 parallel to the pin shaft Ⅰ6. The end cover 3 is sealed and embedded and fixed to the lower end of the cylinder body 1 by screws. The lower end of the pressure plate 4 is rotatably fixed to the upper end of the piston rod 2 through the pin shaft Ⅰ6, and its lower end is rotatably fixed with two symmetrically distributed connecting rods 5 by a pin shaft Ⅱ7, and the other end of the connecting rod 5 is rotatably fixed to the upper end of the cylinder body 1 through another pin shaft Ⅱ7. The upper end of the side of the cylinder body 1 is provided with an oil return port 20 connected to the upper oil chamber 22, and the lower end is provided with an oil inlet 21 connected to the lower oil chamber 23. In order to expand the application scope of the pressing plate 4 and enable the pressing plate 4 to adapt to the crimping of workpieces of different shapes and materials, a pressing block 8 is fixed to the free end of the pressing plate 4 on one side of the pressing workpiece; the shape of the pressing block 8 matches the shape of the pressed workpiece, and the hardness of the material of the pressing block 8 is less than the hardness of the pressed workpiece.

[0011] The clamping force adjustment assembly includes a connecting plate 9, a spring mounting seat 10, a spring pressure pin 11, a butterfly spring 14, a baffle 12 and an adjustment screw 13. The connecting plate 9 is an inverted T-shaped, and two mounting holes are symmetrically opened on its base, and the adjustment screws 13 are fixed in the two mounting holes; its preferred specific structure is: a threaded hole that is vertically connected to the two mounting holes is opened on the side of the base, and the adjustment screw 13 is placed in the mounting hole, and the fastening screw 24 is threadedly connected in the threaded hole and connected to the adjustment screw 13 and is locked and fixed by the locking nut 25. With such a structure, the adjustment screw 13 has high fixing reliability and is easy to disassemble and adjust. The upper end of the connecting plate 9 is fixed to the upper end of the piston rod 2 by two screws Ⅰ19, and two spring mounting seats 10 are symmetrically arranged on both sides of its upper end. The upper ends of the two spring mounting seats 10 overlap the upper end of the oil cylinder body 1 and are fixed to the upper end of the oil cylinder body 1 by two screws respectively. The two spring mounting seats 10 are provided with mounting blind holes, and the two mounting blind holes are symmetrically distributed relative to the connecting plate 9. The spring pressure pin 11 with the butterfly spring 14 is installed in the mounting blind hole and is fixed by the baffle 12 fixed on the bottom surface of the spring mounting seat 10. The upper end of the adjusting screw 13 is opposite to the lower end of the spring pressure pin 11. After the piston rod 2 rises to the position, the pressure plate 4 is pressed on the workpiece, and the adjusting screw 13 is pressed against the spring pressure pin 11.

[0012] The cylinder hole on the oil cylinder body 1 is used as the central reference of this equipment. It can be positioned and connected with other mechanisms according to different use conditions. The oil cylinder body 1 has an oil inlet 21 and an oil return port 20 connected to the hydraulic source, and the hydraulic drive piston rod 2 reciprocates to achieve the function of pressing and loosening the workpiece. When using this device, the oil inlet 21 on the oil cylinder body 1 supplies oil, and the pressure plate 4 is pressed against the processed parts; the position of the adjustment screw 13 is adjusted to make it press against the spring pressure pin 11, thereby pressing the butterfly spring 14, so that the adjustment screw 13 is subjected to the downward spring force; the adjustment screw 13 drives the connecting block 9, thereby driving the piston rod 2 to be subjected to the downward force, offsetting part of the oil pressure lifting force, thereby reducing the force of the piston rod 2 lifting the pressure plate 4, and achieving the purpose of reducing the pressing force of the pressure plate 4 to press the processed parts. When in use, the deformation effect of the hydraulic cylinder on the processed parts when being compressed can be observed, and the size of the adjusting screw 13 pressing the spring pressure pin 11 can be adjusted according to the deformation of the parts. The larger the ejection size of the spring pressure pin 11, the greater the spring force of the butterfly spring 14, and thus the greater the reduction of the compression force, until the deformation of the processed parts completely disappears; when the return oil port supplies oil, the piston rod 2 is retracted, the pressure plate 4 is loosened, and the adjusting screw 13 does not move in the case of tightening the fastening screw 24. The compression force will not change after the hydraulic cylinder is compressed again. Therefore, when the same type of workpiece is compressed, it is only necessary to adjust the position of the adjusting screw 13 once, which is very convenient to use.

[0013] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, technicians familiar with the field can make corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should be regarded as improvements of equivalent technologies and belong to the protection scope of the claims of the present invention.

Claims

1. A hydraulic cylinder with adjustable pressing force, comprising a hydraulic cylinder assembly, characterized in that: Also included is a clamping force adjustment assembly; The hydraulic cylinder assembly comprises a cylinder body, a piston rod, an end cover, a pressure plate, two connecting rods, a pin shaft I and a pin shaft II parallel to the pin shaft I; the end cover is sealed and embedded in the lower end of the cylinder body; the lower end of the pressure plate is rotatably fixed to the upper end of the piston rod through the pin shaft I, and its lower end is rotatably fixed with two symmetrically distributed connecting rods by a pin shaft II, and the other end of the connecting rod is rotatably fixed to the upper end of the cylinder body through another pin shaft II; the upper end of the side surface of the cylinder body is provided with an oil return port connected to the upper oil chamber, and the lower end is provided with an oil inlet connected to the lower oil chamber; The clamping force adjustment assembly includes a connecting plate, a spring mounting seat, a spring pressure pin, a butterfly spring, a baffle and an adjusting screw; the connecting plate is an inverted T-shape, and two mounting holes are symmetrically opened on its base, and the adjusting screws are fixed in the two mounting holes; the upper end of the connecting plate is fixed to the upper end of the piston rod, and two spring mounting seats are symmetrically arranged on both sides of its upper end; the two spring mounting seats are fixed to the upper end of the cylinder body, and both have mounting blind holes, and the two mounting blind holes are symmetrically distributed relative to the connecting plate; the spring pressure pin with a butterfly spring is installed in the mounting blind hole, and is fixed by the baffle fixed on the bottom surface of the spring mounting seat; the upper end of the adjusting screw is opposite to the lower end of the spring pressure pin, and after the piston rod rises to its position, the pressure plate is pressed on the workpiece, and the adjusting screw is pressed against the spring pressure pin.

2. The hydraulic cylinder with adjustable pressing force according to claim 1 is characterized in that: A pressing block is fixed on one side of the pressing workpiece at the free end of the pressing plate; the shape of the pressing block matches the shape of the pressed workpiece, and the hardness of the material of the pressing block is less than the hardness of the pressed workpiece.

3. The hydraulic cylinder with adjustable pressing force according to claim 1 or 2, characterized in that: The specific structure of the adjusting screw being fixed in the two mounting holes of the base of the connecting plate is: a threaded hole is opened on the side of the base and vertically penetrates the two mounting holes, the adjusting screw is placed in the mounting hole, the fastening screw is threadedly connected in the threaded hole and connected to the adjusting screw and is locked and fixed by a locking nut.

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