Buffering and damping device for hydraulic machine

Abstract

The utility model discloses a buffer damping device for a hydraulic machine, which relates to the technical field of research, development and manufacturing of automobile parts and comprises a first connecting plate, and the surface of the first connecting plate is fixedly connected with a connecting rod. When the hydraulic machine is in an initial state, the piston rod is located in the middle of the hydraulic cylinder, the magnetorheological elastomer is not electrified, the damping force is 5kN, and the cushion valve is closed; when the hydraulic machine is in an impact stage, an external load pushes the piston rod to compress the magnetorheological elastomer, and meanwhile buffer oil generates a damping force peak value of 15 MPa through the throttling hole; the excitation coil adjusts the current to 1.8 A according to a signal of the displacement sensor, and the rigidity of the magnetorheological elastomer is improved to 120 kPa; after the load is relieved, the belleville spring pushes the piston rod to reset, the buffer valve is opened, the pressure relief pressure is reduced to 2 MPa, equipment oscillation caused by too fast return stroke is prevented, and through the synergistic effect of magneto-rheological damping dynamic adjustment, hydraulic-mechanical multi-stage buffer and intelligent pressure relief control, the hydraulic machine achieves the efficient damping effect.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts research and manufacturing technology, specifically to a buffer and shock absorption device for hydraulic presses. Background Technology

[0002] A hydraulic press is a machine that uses liquid as its working medium to transfer energy to achieve various processes. Besides forging, hydraulic presses can also be used for straightening, pressing, packaging, briquetting, and pressing plates. Hydraulic presses include water presses and oil presses. Those using water-based liquids as the working medium are called water presses, and those using oil are called oil presses. The specifications of hydraulic presses are generally expressed in nominal working force or nominal tonnage. Hydraulic presses are mostly used for stretching, turning, bending, and stamping of thin metal sheet parts, and can also be used for general pressing processes. Depending on user needs, features such as blanking buffers, feeding mechanisms, and movable worktables can be added.

[0003] When using a hydraulic press, the instantaneous impact force often causes the entire equipment to shake. If the shaking of the entire equipment cannot be effectively mitigated, it may affect the processing accuracy of the equipment or even cause damage to the equipment. Currently, hydraulic presses generally use simple springs and buffer pads for shock absorption. However, during the operation of the hydraulic press, the shock absorption effect is still not good, resulting in a short service life of the hydraulic press. Utility Model Content

[0004] The purpose of this invention is to provide a buffer and shock absorption device for hydraulic presses to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A buffer and shock absorption device for a hydraulic press includes a first connecting plate, a connecting rod fixedly connected to the surface of the first connecting plate, a first buffer element installed inside a slot opened on the surface of the first connecting plate, and a second buffer element installed on the surface of the first connecting plate.

[0007] The second buffer includes a hydraulic cylinder, which is fixedly connected to one end of a first connecting plate and a second connecting plate. A magnetorheological elastomer is installed inside the hydraulic cylinder, and an excitation coil is fixedly connected inside the magnetorheological elastomer. A piston rod is installed inside both the hydraulic cylinder and the magnetorheological elastomer.

[0008] A third buffer is installed on the surface of the piston rod;

[0009] The third buffer component includes a piston, a sealing sleeve, a buffer valve, a guide sleeve, a dustproof ring pressure plate, and a hydraulic damping plate. The piston is sleeved on the surface of the piston rod, and a piston sealing ring is installed inside the piston. A wear-resistant ring is installed inside one end of the piston. The dustproof ring pressure plate is fixedly connected to one end of the second connecting plate. Buffer sleeves are fixedly connected to both ends of the piston. The piston is sleeved on the surface of the piston rod and is made of bronze ZCuSn10Pb1. A nitrile rubber piston sealing ring and a wear-resistant ring made of polytetrafluoroethylene are installed inside the piston.

[0010] A further improvement of this utility model is that: a dustproof ring pressure plate is fitted inside the sealing sleeve, a dustproof ring is fixedly connected inside the dustproof ring pressure plate, the guide sleeve is fixedly connected inside the second connecting plate, and the hydraulic damping plate is nested inside the piston rod. The material is 42CrMo steel, and six evenly distributed throttling holes are opened on the surface.

[0011] A further improvement of this utility model is that the buffer valve is installed on one side of the first connecting plate, and the buffer valve, guide sleeve, and buffer valve are cartridge-type overflow valves.

[0012] A further improvement of the present invention is that: the first buffer component includes a polyurethane rubber block, the polyurethane rubber block is installed inside the groove of the first connecting plate, a disc spring is fixedly connected to the bottom of the polyurethane rubber block, and the interior of the polyurethane rubber block is provided with a guide sleeve, which is a copper-based graphite bushing, and is press-fitted into the inner hole of the second connecting plate.

[0013] A further improvement of this utility model is that: the hydraulic damping plate is sleeved inside the piston rod, the hydraulic damping plate is installed inside the magnetorheological elastomer, and the surface of the hydraulic damping plate is provided with a throttling orifice with a diameter of 2-5mm, a buffer oil viscosity of ISO VG32-68, and the yield strength of the magnetorheological elastomer is increased to 80kPa under a current of 1.5A, which together with the throttling orifice of the hydraulic damping plate dissipates energy.

[0014] A further improvement of this utility model is that the excitation current of the magnetorheological elastomer is 0.5-2.0A, the thickness is 8-15mm, and the magnetorheological elastomer in the hydraulic cylinder suppresses medium-frequency vibration (10-50Hz).

[0015] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0016] 1. This utility model provides a buffer and shock absorption device for a hydraulic press. When the hydraulic press is in its initial state, the piston rod is in the middle of the hydraulic cylinder, the magnetorheological elastomer is not subjected to a resistance damping force of 5kN, and the buffer valve is closed. When the hydraulic press is in the impact stage: the external load pushes the piston rod to compress the magnetorheological elastomer, and at the same time, the buffer oil generates a damping force peak of 15MPa through the throttling orifice; the excitation coil adjusts the current to 1.8A according to the displacement sensor signal, and the stiffness of the magnetorheological elastomer is increased to 120kPa. When the hydraulic press is in the return stage: after the load is released, the disc spring pushes the piston rod to reset, the buffer valve opens and the pressure drops to 2MPa to prevent the equipment from oscillating due to excessively fast return. Through the synergistic effect of dynamic adjustment of magnetorheological damping, hydraulic-mechanical multi-stage buffering, and intelligent pressure relief control, the hydraulic press achieves a high-efficiency shock absorption effect and improves the service life of the hydraulic press.

[0017] 2. This utility model provides a buffer and shock absorption device for a hydraulic press. The piston is sleeved on the surface of the piston rod and is made of bronze ZCuSn10Pb1. A nitrile rubber piston seal ring and a wear-resistant ring made of polytetrafluoroethylene are installed inside. The hydraulic damping plate is nested inside the piston rod and has 6 evenly distributed throttling holes on its surface. ISO VG46 buffer oil is injected inside. The buffer valve and guide sleeve are cartridge-type relief valves and are installed on the side wall of the first connecting plate. The guide sleeve is press-fitted into the inner hole of the second connecting plate to limit the radial displacement of the piston rod, thereby achieving a synergistic effect of efficient energy dissipation and long-term sealing protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the second buffer component of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the second buffer component of this utility model;

[0021] Figure 4 This is a schematic diagram of the honeycomb structure of this utility model.

[0022] In the diagram: 1. First connecting plate; 2. First buffer component; 20. Polyurethane rubber block; 21. Disc spring; 22. Honeycomb hole; 3. Second buffer component; 30. Hydraulic cylinder; 31. Magnetorheological elastomer; 32. Excitation coil; 4. Piston rod; 5. Third buffer component; 50. Buffer sleeve; 51. Piston; 52. Piston sealing ring; 53. Wear-resistant ring; 54. Buffer valve; 55. Dustproof ring pressure plate; 56. Dustproof ring; 57. Guide sleeve; 58. Sealing sleeve; 59. Hydraulic damping plate; 591. Throttling orifice; 6. Connecting rod; 7. Second connecting plate. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to embodiments:

[0024] Example 1

[0025] like Figures 1-4 As shown, this utility model provides a buffer and shock absorption device for a hydraulic press, including a first connecting plate 1, a connecting rod 6 fixedly connected to the surface of the first connecting plate 1, a first buffer 2 installed inside a groove opened on the surface of the first connecting plate 1, a second buffer 3 installed on the surface of the first connecting plate 1, and a third buffer 5 installed on the surface of the piston rod 4. The third buffer 5 includes a piston 51, a sealing sleeve 58, a buffer valve 54, a guide sleeve 57, a dustproof ring pressure plate 55, and a hydraulic damping plate 59. The piston 51 is sleeved on the surface of the piston rod 4, a piston sealing ring 52 is installed inside the piston 51, and a piston sealing ring 52 is installed inside one end of the piston 51. Wear-resistant ring 53, dustproof ring pressure plate 55 fixedly connected to one end of the second connecting plate 7, buffer sleeve 50 fixedly connected to both ends of piston 51, dustproof ring pressure plate 55 sleeved inside sealing sleeve 58, dustproof ring 56 fixedly connected inside dustproof ring pressure plate 55, guide sleeve 57 fixedly connected inside the second connecting plate 7, buffer valve 54 installed on one side of the first connecting plate 1, hydraulic damping plate 59 sleeved inside piston rod 4, hydraulic damping plate 59 installed inside magnetorheological elastomer 31, throttling hole 591 opened on the surface of hydraulic damping plate 59, throttling hole 591 diameter 2-5mm, buffer oil viscosity ISO VG32-6;

[0026] Specifically, piston 51 is fitted onto the surface of piston rod 4 and is made of bronze ZCuSn10Pb1. It is internally fitted with a nitrile rubber piston seal ring 52 and a wear-resistant ring 53 made of polytetrafluoroethylene.

[0027] The hydraulic damping plate 59 is nested inside the piston rod 4. It is made of 42CrMo steel and has 6 evenly distributed throttling holes 591 (hole diameter 3mm, hole spacing 15mm) on its surface. ISO VG46 buffer oil is injected inside.

[0028] The buffer valve 54 and the guide sleeve 57 are both cartridge-type relief valves (opening pressure 10MPa) installed on the side wall of the first connecting plate 1. The guide sleeve 57 is a copper-based graphite bushing that is press-fitted into the inner hole of the second connecting plate 7 to limit the radial displacement of the piston rod 4.

[0029] The dustproof ring pressure plate 55 is fixed to the end of the second connecting plate 7 by screws, and a fluororubber dustproof ring 56 is installed inside, forming a double sealing barrier with the sealing sleeve 58 (made of PTFE).

[0030] Example 2

[0031] like Figures 1-4As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the first buffer 2 includes a polyurethane rubber block 20, which is installed inside the groove of the first connecting plate 1. A disc spring 21 is fixedly connected to the bottom of the polyurethane rubber block 20, and a 23 is opened inside the polyurethane rubber block 20. The second buffer 3 includes a hydraulic cylinder 30, which is fixedly connected to one end of the first connecting plate 1. A second connecting plate 7 is fixedly connected to one end of the hydraulic cylinder 30. A magnetorheological elastomer 31 is installed inside the hydraulic cylinder 30, and an excitation coil 32 is fixedly connected inside the magnetorheological elastomer 31. A piston rod 4 is installed inside the hydraulic cylinder 30 and the magnetorheological elastomer 31. The excitation current of the magnetorheological elastomer 31 is 0.5-2.0A, and the thickness is 8-15mm.

[0032] Specifically, it consists of a polyurethane rubber block 20 (Shore hardness 75A) and a disc spring 21 (material 60Si2Mn, outer diameter 50mm, free height 15mm). The bottom of the polyurethane rubber block 20 and the disc spring 21 are bonded together with epoxy resin to form an elastic-metal composite buffer structure. The polyurethane rubber block 20 and the disc spring 21 absorb high-frequency low-energy vibrations.

[0033] The thickness of the magnetorheological elastomer 31 is increased to 15mm, and the excitation coil 32 adopts a dual-winding design (0.5mm wire diameter, 200 turns). The current is adjusted by a PID controller (0.5-2.0A) to achieve real-time control of the damping force (response time ≤50ms). The magnetorheological elastomer 31 inside the hydraulic cylinder 30 suppresses medium-frequency vibration (10-50Hz).

[0034] When the hydraulic press is subjected to impact load, the yield strength of the magnetorheological elastomer 31 increases to 80 kPa under a current of 1.5 A. It dissipates energy together with the throttling orifice 591 of the hydraulic damping plate 59, thereby reducing the peak impact force by 60%.

[0035] The working principle of the buffer and shock absorption device used in hydraulic presses will be explained in detail below.

[0036] like Figures 1-4 As shown, when the hydraulic press is in the initial state, the piston rod 4 is in the middle of the hydraulic cylinder 30, the magnetorheological elastomer 31 is not subjected to a resistance damping force of 5kN, and the buffer valve 54 is closed.

[0037] When the hydraulic press is in the impact stage: the external load pushes the piston rod 4 to compress the magnetorheological elastomer 31, and at the same time the buffer oil generates a damping force peak of 15MPa through the throttle hole 591; the excitation coil 32 adjusts the current to 1.8A according to the displacement sensor signal, and the stiffness of the magnetorheological elastomer 31 is increased to 120kPa.

[0038] When the hydraulic press is in the return phase: after the load is released, the disc spring 21 pushes the piston rod 4 to reset, and the buffer valve 54 opens to release pressure down to 2MPa, preventing the equipment from vibrating due to excessively fast return.

[0039] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A damping device for a hydraulic press, comprising a first connecting plate (1), characterised in that: The surface of the first connecting plate (1) is fixedly connected with a connecting rod (6), a notch opened on the surface of the first connecting plate (1) is internally mounted with a first buffer (2), and the surface of the first connecting plate (1) is mounted with a second buffer (3). The second buffer (3) comprises a hydraulic cylinder (30), one end of the hydraulic cylinder (30) is fixedly connected with the first connecting plate (1), one end of the hydraulic cylinder (30) is fixedly connected with a second connecting plate (7), the inside of the hydraulic cylinder (30) is mounted with a magnetorheological elastomer (31), the inside of the magnetorheological elastomer (31) is fixedly connected with an excitation coil (32), and the inside of the hydraulic cylinder (30) and the magnetorheological elastomer (31) is mounted with a piston rod (4). The surface of the piston rod (4) is mounted with a third buffer (5). The third buffer (5) comprises a piston (51), a sealing sleeve (58), a buffer valve (54), a guide sleeve (57), a dust ring pressing plate (55) and a hydraulic damping plate (59), the piston (51) is sleeved on the surface of the piston rod (4), the inside of the piston (51) is mounted with a piston sealing ring (52), one end of the piston (51) is internally mounted with a wear-resistant ring (53), one end of the dust ring pressing plate (55) is fixedly connected with the second connecting plate (7), and both ends of the piston (51) are fixedly connected with a buffer sleeve (50).

2. A cushioning and damping device for a hydraulic press according to claim 1, characterized in that: The inside of the sealing sleeve (58) is sleeved with the dust ring pressing plate (55), the inside of the dust ring pressing plate (55) is fixedly connected with a dust ring (56), and the guide sleeve (57) is fixedly connected in the second connecting plate (7).

3. The cushioning and damping device for a hydraulic machine according to claim 1, characterized in that: The buffer valve (54) is mounted on one side of the first connecting plate (1).

4. The cushioning and damping device for a hydraulic machine according to claim 1, characterized in that: The first buffer (2) comprises a polyurethane rubber block (20), the polyurethane rubber block (20) is mounted in the notch of the first connecting plate (1), the bottom of the polyurethane rubber block (20) is fixedly connected with a disc spring (21), and the inside of the polyurethane rubber block (20) is provided with (23).

5. The cushioning and damping device for a hydraulic machine according to claim 1, characterized in that: The hydraulic damping plate (59) is sleeved in the inside of the piston rod (4), the hydraulic damping plate (59) is mounted in the inside of the magnetorheological elastomer (31), the surface of the hydraulic damping plate (59) is provided with a throttle hole (591), the diameter of the throttle hole (591) is 2-5 mm, and the buffer oil viscosity is ISO VG32-68.

6. The cushioning and damping device for a hydraulic machine according to claim 1, characterized in that: The excitation current of the magnetorheological elastomer (31) is 0.5-2.0 A, and the thickness is 8-15 mm.

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