Gas-liquid stretching pad for mechanical punching machine
By installing gas-liquid stretching pads on the mechanical punch, using the cooperation of the cylinder and hydraulic cylinder, the problem of unadjustable parameters of the punching machine equipment is solved, adjustable support force and pressure are achieved, and the workpiece stretching ability and equipment operation safety are improved. It has the advantages of no noise and pollution.
Patent Information
- Application Number
- CN202421133848.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-23
AI Technical Summary
When producing thin-plate shell workpieces, mechanical punches lack adjustable reverse support and pressure, which limits the adjustment of equipment parameters of the stretching process of different types of product parts. The stroke and pressure of existing hydraulic pads are unadjustable, and the air cushion device can only be withdrawn. The material cannot be compressed and stretched.
Design a gas-liquid stretch pad for mechanical punching machine, including cylinders and hydraulic cylinders. The combination of hydraulic and air pressure is controlled through the load shaft and the one-way valve to achieve adjustability of support force and pressure, and use the closed-loop fluid to operate without noise and pollution. .
The stretching capacity of the mechanical punch is realized, and the support force can be adjusted quickly according to the workpiece requirements, ensuring the operational safety and functional integrity of the equipment, and is noise-free and pollution-free.
Smart Images
Figure CN222307028U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas-liquid stretching pads, in particular to a gas-liquid stretching pad for a mechanical punching machine. Background Art
[0002] The mechanical punch press uses the compressed air provided by the compressed air pump to enter the cylinder through the solenoid valve, drive the piston to the main shaft to make the main shaft move downward, thereby forming an impact force, so that the workpiece produces a specified deformation in the mold to achieve the purpose of processing. The design principle of the punch press is to convert circular motion into linear motion. The main motor outputs power to drive the flywheel, and the clutch drives the gear, crankshaft (or eccentric gear), connecting rod, etc. to achieve the linear motion of the slider. The movement from the main motor to the connecting rod is circular motion.
[0003] Most thin plate and shell (stretching) workpieces are produced on hydraulic equipment, and the equipment for producing such workpieces must have two process actions: 1. A force that moves vertically downward; 2. A force in the opposite direction and can be adjusted at will (support force). Among them, the support force is crucial in the production process of stretched parts. Although mechanical punching machines currently have hydraulic pads, the stroke and pressure are not adjustable, which limits the equipment parameters in the stretching process of different types of products. Although a small number of punching machines are equipped with air cushion devices, they can only play a role in withdrawing materials and cannot achieve the edge pressing and stretching function, mainly because their reverse support force is insufficient. Based on the above problems, the utility model proposes a gas-liquid stretching pad for a mechanical punching machine. Utility Model Content
[0004] The utility model provides a gas-liquid stretching pad for a mechanical punching machine. By installing the device on the mechanical punching machine, the punching equipment can be enabled to have the ability to produce stretching workpieces.
[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas-liquid stretching pad for a mechanical punch, comprising a gas-liquid stretching pad body installed on the bottom surface of the lower worktable of the mechanical punch, the gas-liquid stretching pad body comprising an upper plate, a middle plate and a lower plate arranged in sequence from top to bottom, a hydraulic cylinder is fixedly provided between the upper plate and the middle plate, and a cylinder is fixedly provided between the middle plate and the lower plate.
[0006] The cylinder comprises a cylinder body and a cylinder piston slidably arranged inside the cylinder body. The cylinder piston divides the hydraulic cylinder body into a b chamber and an a chamber distributed up and down. Compressed air in the cylinder body will push the cylinder piston to move up and down.
[0007] The hydraulic cylinder includes a hydraulic cylinder body and an oil pressure piston slidably arranged inside the hydraulic cylinder body. The oil pressure piston divides the hydraulic cylinder body into a d chamber and a c chamber distributed up and down. Both the d chamber and the c chamber are filled with hydraulic oil. A load shaft is arranged inside the cylinder body and the hydraulic cylinder body. The load shaft penetrates the upper plate and the middle plate and extends out of the top of the upper plate. The load shaft is fixedly connected to the cylinder piston and the oil pressure piston. The up and down movement of the cylinder piston will drive the load shaft and the oil pressure piston on the load shaft to move up and down.
[0008] An f channel connected to the d chamber is provided in the upper plate, and an e channel connected to the c chamber is provided in the middle plate. The f channel is connected to the e channel through an oil drain channel. The oil drain channel is provided on the outside of the hydraulic cylinder. When the pressure of the oil in the c chamber is high, the overpressure oil in the c chamber can be drained back to the d chamber through the e channel, the oil drain channel and the f channel, so that the oil pressure in the c chamber remains within the preset pressure value.
[0009] Preferably, four one-way valves are installed on the oil pressure piston, which only allow the hydraulic oil in the d chamber to flow into the c chamber. When the oil pressure piston moves upward, the oil in the d chamber leaks into the c chamber through the one-way valves.
[0010] Preferably, a one-way sequence valve is installed in the oil drain channel. When the pressure of the hydraulic oil in chamber C is greater than the opening pressure set by the one-way sequence valve, the one-way sequence valve opens, and the oil in chamber C is drained back to chamber D through channel E, oil drain channel and channel F.
[0011] Preferably, the load shaft is fixed to the oil pressure piston and the cylinder piston by connecting bolts, and the top end of the oil pressure piston is located outside the load shaft and fixed with a limiting block, which facilitates the installation and fixation of the load shaft, the oil pressure piston and the cylinder piston.
[0012] Preferably, seals are provided between the load shaft and the upper plate, between the load shaft and the middle plate, between the cylinder piston and the cylinder body, and between the oil pressure piston and the hydraulic cylinder body to maintain a sealed state and prevent leakage of compressed gas or hydraulic oil.
[0013] Preferably, a compressed air inlet connected to chamber a is provided at the center of the lower plate for inputting compressed air into chamber a, and a pressure relief hole is provided at the top of the outer wall of the cylinder body.
[0014] Preferably, a pressure gauge installation hole is provided on the outer wall of the middle plate for installing a pressure gauge to detect pressure, and is used for detecting oil pressure.
[0015] Preferably, the upper plate, the middle plate and the lower plate are fixedly connected by a plurality of locking bolts and locking nuts.
[0016] In the above technical solution, the technical effects and advantages provided by the utility model are:
[0017] 1. The gas-liquid stretching pad of the utility model is an independent device. When in use, the gas-liquid stretching pad can be hoisted and fastened to the mechanical punching machine to ensure that there is no interference with all the configuration functions and operation methods of the original equipment;
[0018] 2. The gas-liquid stretching pad of the utility model has a simple structure, and the parts used are all mechanical structures, and the operation is safe and reliable;
[0019] 3. The supporting force of the gas-liquid stretching pad of the utility model can be adjusted infinitely according to the stretching requirements of the workpiece;
[0020] 4. When the gas-liquid stretching pad of the utility model is working, it utilizes its own fluid closed loop operation, and has the advantages of no noise and no pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is an external structural diagram of the gas-liquid stretching pad of the utility model;
[0022] Figure 2 This is a diagram of the internal structure of the gas-liquid stretching pad of the utility model;
[0023] Figure 3 This is an installation diagram of the gas-liquid stretching pad and the mechanical punch press of the utility model;
[0024] Figure 4 for Figure 3 Side view of.
[0025] Description of reference numerals:
[0026] 1. Gas-liquid stretch pad body;
[0027] 2. Upper plate; 21. f channel;
[0028] 3. Middle plate; 31. e channel; 32. Pressure gauge installation hole;
[0029] 4. Lower the board;
[0030] 5. Cylinder; 51. Cylinder body; 52. Cylinder piston; 53. Chamber a; 54. Chamber b; 55. Pressure relief hole;
[0031] 6. Hydraulic cylinder; 61. Hydraulic cylinder body; 62. Oil pressure piston; 63. C chamber; 64. D chamber; 65. Load shaft; 66. One-way valve;
[0032] 7. Oil drain channel; 8. One-way sequence valve; 9. Connecting bolt; 10. Seal; 11. Limit block; 12. Compressed air inlet; 13. Locking bolt; 14. Locking nut;
[0033] 15. Mechanical punch; 16. Lower workbench; 17. Reciprocating slide block. DETAILED DESCRIPTION
[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0035] The utility model provides Figure 1-4 The gas-liquid stretching pad for a mechanical punch shown in the figure includes a gas-liquid stretching pad body 1, which is installed on the bottom surface of the lower workbench 16 of the mechanical punch 15. The gas-liquid stretching pad body 1 includes an upper plate 2, a middle plate 3 and a lower plate 4 arranged in sequence from top to bottom. The upper plate 2, the middle plate 3 and the lower plate 4 are fixedly connected by multiple locking bolts 13 and locking nuts 14.
[0036] like Figure 1-2 As shown, a cylinder 5 is fixedly provided between the middle plate 3 and the lower plate 4, and the cylinder 5 includes a cylinder body 51 and a cylinder piston 52 slidably arranged inside the cylinder body 51, and a seal 10 is provided between the cylinder piston 52 and the cylinder body 51 to prevent gas leakage, and the cylinder piston 52 divides the hydraulic cylinder body 61 into a b chamber 54 and an a chamber 53 distributed up and down, and a compressed air inlet 12 connected to the a chamber 53 is provided at the center of the lower plate 4 for inputting compressed air into the a chamber 53, and a pressure relief hole 55 is provided at the top of the outer wall of the cylinder body 51.
[0037] A hydraulic cylinder 6 is fixedly provided between the upper plate 2 and the middle plate 3, and the hydraulic cylinder 6 includes a hydraulic cylinder body 61 and an oil pressure piston 62 slidably arranged inside the hydraulic cylinder body 61, and the oil pressure piston 62 divides the hydraulic cylinder body 61 into a d chamber 64 and a c chamber 63 distributed up and down, and the d chamber 64 and the c chamber 63 are both filled with hydraulic oil, and a seal 10 is provided between the oil pressure piston 62 and the hydraulic cylinder body 61 to avoid mutual interference between the hydraulic oil in the d chamber 64 and the c chamber 63; four one-way valves 66 are installed on the oil pressure piston 62, which only allow the hydraulic oil in the d chamber 64 to flow into the c chamber 63. When the oil pressure piston 62 moves upward, the oil in the d chamber 64 leaks into the c chamber 63 through the one-way valve 66.
[0038] A load shaft 65 is provided inside the cylinder body 51 and the hydraulic cylinder body 61. The load shaft 65 penetrates the upper plate 2 and the middle plate 3 and extends out of the top of the upper plate 2. The load shaft 65 is fixed to the oil pressure piston 62 and the cylinder piston 52 by connecting bolts 9, and a limiting block 11 is fixed on the outside of the load shaft 65 at the top of the oil pressure piston 62. Seals 10 are provided between the load shaft 65 and the upper plate 2 and between the load shaft 65 and the middle plate 3 to prevent leakage of air or hydraulic oil.
[0039] Next, an f channel 21 communicating with the d chamber 64 is opened in the upper plate 2, and an e channel 31 communicating with the c chamber 63 is opened in the middle plate 3. The f channel 21 is connected with the e channel 31 through an oil drain channel 7, and the oil drain channel 7 is arranged outside the hydraulic cylinder 6;
[0040] A one-way sequence valve 8 is installed in the oil leakage channel 7. The one-way sequence valve 8 is composed of a sequence valve and a one-way valve in parallel. It relies on the pressure in the pneumatic transmission system to control the sequential action of the pneumatic actuator. When the pressure of the hydraulic oil in the c chamber 63 is greater than the opening pressure set by the one-way sequence valve 8, the one-way sequence valve 8 opens, and the oil in the c chamber 63 is discharged back to the d chamber 64 through the e channel 31, the oil leakage channel 7 and the f channel 21.
[0041] A pressure gauge installation hole 32 is also provided on the outer wall of the middle plate 3 for installing a pressure gauge to detect pressure.
[0042] The gas-liquid stretching pad of the utility model is an independent device, which ensures that there is no interference with all configuration functions and operation methods of the original equipment. When in use, the gas-liquid stretching pad is hoisted and fastened to the bottom surface of the lower workbench 16 of the mechanical punch 15 and installed.
[0043] When the gas-liquid stretching pad body 1 is first operated, the opening pressure of the one-way sequence valve 8 must be adjusted to the minimum, and after the mechanical punch 15 is started to make several reciprocating movements, the pressure is gradually adjusted to the required value.
[0044] During operation, compressed air is input into the a chamber 53 in the cylinder body 51 through the compressed air inlet 12, and the compressed air will push the cylinder piston 52 upward, thereby driving the oil pressure piston 62 and the load shaft 65 to move upward to the zero position. At this time, the c chamber 63 and the d chamber 64 in the hydraulic cylinder body 61 are both in a closed state, and the c chamber 63 and the d chamber 64 are both filled with hydraulic oil. Therefore, the pressure generated by the oil pressure piston 62 pushing the oil in the d chamber 64 upward will open the large-flow one-way valve 66 installed on the oil pressure piston 62, and the oil in the d chamber 64 will leak into the c chamber 63 through the one-way valve 66, so that the oil in the c chamber 63 is always in a saturated state.
[0045] When 65 moves downward under the load force, the one-way valve 66 on the oil pressure piston 62 is closed. At this time, the oil in the c chamber 63 is enclosed in a closed space by the one-way valve 66 and the one-way sequence valve 8. Since the oil has the characteristic of being incompressible, the compressed oil in the c chamber 63 generates a large supporting force in the opposite direction (the load force multiplied by the area of the oil pressure piston). As the oil pressure piston 62 continues to move downward, the oil pressure in the c chamber 63 gradually increases. Finally, when the pressure of the oil in the c chamber 63 is greater than the opening pressure set by the one-way sequence valve 8, the oil drain channel 7 is opened, and the overpressure oil in the c chamber 63 is drained back to the d chamber 64 through the e channel 31, the oil drain channel 7, and the f channel 21. At this time, the oil pressure in the c chamber 63 still remains within the preset pressure value.
[0046] When the reciprocating slider 17 of the mechanical punch 15 moves downward to the limit and needs to return, the downward load force on the load shaft 65 disappears, and the compressed air always acting on the a chamber 53 drives the cylinder piston 52 and the oil pressure piston 62 to move upward together. This can not only eject the pressed workpiece from the mold, but also force the oil in the d chamber 64 to be pressurized and injected into the c chamber 63 through the one-way valve 66 installed on the oil pressure piston 62. When the reciprocating slider 17 moves upward to the upper limit and stops moving, a working procedure ends. The gas-liquid stretching pad of the utility model uses its own fluid closed loop operation, has the advantages of no noise and no pollution, and the supporting force of the gas-liquid stretching pad can be adjusted infinitely according to the stretching amount required for the workpiece.
[0047] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A gas-liquid stretching pad for a mechanical punch, characterized in that: The invention comprises a gas-liquid stretching pad body (1) installed on the bottom surface of a lower worktable (16) of a mechanical punching machine (15), the gas-liquid stretching pad body (1) comprising an upper plate (2), a middle plate (3) and a lower plate (4) arranged in sequence from top to bottom, characterized in that a hydraulic cylinder (6) is fixedly arranged between the upper plate (2) and the middle plate (3), and a gas cylinder (5) is fixedly arranged between the middle plate (3) and the lower plate (4); The cylinder (5) comprises a cylinder body (51) and a cylinder piston (52) slidably arranged inside the cylinder body (51), and the cylinder piston (52) divides the inside of the hydraulic cylinder body (61) into a b chamber (54) and an a chamber (53) distributed vertically. The hydraulic cylinder (6) comprises a hydraulic cylinder body (61) and an oil pressure piston (62) slidably arranged inside the hydraulic cylinder body (61); the oil pressure piston (62) divides the hydraulic cylinder body (61) into a d chamber (64) and a c chamber (63) distributed vertically; the d chamber (64) and the c chamber (63) are both filled with hydraulic oil; A load shaft (65) is provided inside the cylinder body (51) and the hydraulic cylinder body (61), the load shaft (65) penetrates the upper plate (2) and the middle plate (3) and extends out of the top of the upper plate (2), and the load shaft (65) is fixedly connected to the cylinder piston (52) and the oil pressure piston (62); The upper plate (2) is provided with an f channel (21) communicating with the d chamber (64), the middle plate (3) is provided with an e channel (31) communicating with the c chamber (63), the f channel (21) and the e channel (31) being communicated with each other via an oil drain channel (7), and the oil drain channel (7) is provided outside the hydraulic cylinder (6).
2. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: The oil pressure piston (62) is provided with four one-way valves (66) which only allow the hydraulic oil in the d chamber (64) to flow into the c chamber (63). When the oil pressure piston (62) moves upward, the oil in the d chamber (64) leaks into the c chamber (63) through the one-way valves (66).
3. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: A one-way sequence valve (8) is installed in the oil leakage passage (7). When the pressure of the hydraulic oil in the C chamber (63) is greater than the opening pressure set by the one-way sequence valve (8), the one-way sequence valve (8) opens, and the oil in the C chamber (63) is discharged back to the D chamber (64) via the E passage (31), the oil leakage passage (7) and the F passage (21).
4. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: The load shaft (65) is fixed to the oil pressure piston (62) and the cylinder piston (52) via connecting bolts (9), and the top end of the oil pressure piston (62) is located outside the load shaft (65) and fixed with a limiting block (11).
5. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: Seals (10) are provided between the load shaft (65) and the upper plate (2), between the load shaft (65) and the middle plate (3), between the cylinder piston (52) and the cylinder body (51), and between the oil pressure piston (62) and the hydraulic cylinder body (61).
6. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: A compressed air inlet (12) communicating with chamber a (53) is provided at the center of the lower plate (4) for inputting compressed air into chamber a (53), and a pressure relief hole (55) is provided at the top of the outer wall of the cylinder body (51).
7. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: The outer wall of the middle plate (3) is provided with a pressure gauge installation hole (32) for installing a pressure gauge to detect pressure.
8. The gas-liquid stretching pad for a mechanical punch press according to claim 1, characterized in that: The upper plate (2), the middle plate (3) and the lower plate (4) are fixedly connected via a plurality of locking bolts (13) and locking nuts (14).