Closed hydraulic cushion hydraulic machine

Abstract

A cylinder barrel is welded to the lower portion of a workbench, an ejector cylinder is fixed to a lower port of the cylinder barrel, the cylindrical closed hydraulic cushion is fixed to the upper end of a piston rod of an ejector rod, copper rings are embedded in the peripheral steps of the upper end and the lower end of the hydraulic cushion respectively, and the outer walls of the copper rings abut against the inner wall of the cylinder barrel respectively. A check ring is fixed to the lower end face of the hydraulic cushion, and the outer edge of the check ring abuts against the lower portion of the inner edge of the lower copper ring. A gasket is fixed on the periphery of the upper end surface of the hydraulic cushion; the outer edge of the gasket is pressed above the inner edge of the upper copper ring; stepped holes are symmetrically formed in the workbench, guide sleeves extending downwards into an inner cavity of the cylinder barrel are inserted into the stepped holes respectively, and flanges at the upper ends of the guide sleeves are fixed into large holes at the upper ends of the stepped holes; an ejector rod is arranged in each guide sleeve, the bottom of each ejector rod abuts against a cushion block or a gasket, and the cushion block and the gasket are equal in height and fixed to the upper end face of the hydraulic cushion. The hydraulic machine is compact in structure, high in strength and capable of meeting the stretching requirements of small table tops and large tonnage.

Description

Technical Field

[0001] The utility model relates to a hydraulic press, in particular to a closed hydraulic pad hydraulic press, belonging to the technical field of hydraulic machine tools. Background Art

[0002] Hydraulic press is a machine that uses liquid static pressure to process metal products, and is often used in press forming processes such as forging, stamping, cold extrusion, straightening, bending, flanging, sheet stretching, etc. When stretching a sheet, a hydraulic pad is usually set on the machine body workbench, and the stretching action is performed in conjunction with the sliding stroke to form a deep cavity, countersunk hole, etc. on the workpiece.

[0003] The Chinese utility model patent with the announcement number CN 207327695U discloses a hydraulic pad device of a hydraulic press, including a workbench pad, the lower end surface of the workbench pad is supported on the workbench top plate, a workbench vertical plate is welded below the workbench top plate, a hydraulic pad and an ejector cylinder are installed in the cavity of the workbench vertical plate, the cylinder body of the ejector cylinder is fixed on the ejector cylinder mounting plate, the left and right sides of the ejector cylinder mounting plate are respectively supported on the bottom beam, and the outer sides of the bottom beam are respectively welded to the workbench vertical plate; the hydraulic pad is an integral structure and the center of the hydraulic pad is fixed to the top of the piston rod of the ejector cylinder, the four corners of the hydraulic pad are respectively provided with guide holes, and guide pillars are respectively inserted in the guide holes; the lower ends of the guide pillars are respectively inserted in the guide pillar mounting countersunk holes of the ejector cylinder mounting plate, the bottom wall center of the guide pillar mounting countersunk holes is provided with a light hole, and the guide pillar fixing screws are screwed from bottom to top in the screw hole at the center of the lower end of the guide pillar; the upper end of the guide pillar is pressed under the workbench pad.

[0004] Its defects are: 1. The thickness of the workbench pad is 200-230mm, double-sided processing, and fixed to the workbench, which is prone to cumulative tolerance;

[0005] 2. A large square hole is opened in the center of the workbench, which affects the strength of the workbench;

[0006] 3. The hydraulic pad ejector cylinder is installed on the vertical plate of the workbench, and its strength is not as good as that installed on the integral workbench;

[0007] 4. In order to ensure that small molds can be used, the machine tool tonnage must be reduced;

[0008] 5. When the hydraulic pad is ejected from the cylinder for maintenance, the vertical plate of the workbench must be removed, and the hydraulic pad must be removed and taken out from above the workbench. Utility Model Content

[0009] The purpose of the utility model is to overcome the problems existing in the prior art and provide a closed hydraulic pad hydraulic press with compact structure, saving workbench materials, high strength, and able to meet the stretching needs of small tabletops and large tonnage.

[0010] In order to solve the above technical problems, the utility model provides a closed hydraulic pad hydraulic press, including a workbench, a cylinder is welded below the workbench, a top cylinder is fixed to the lower port of the cylinder, a cylindrical closed hydraulic pad is fixed to the upper end of the piston rod of the top rod, an upper copper ring is embedded at the outer peripheral step of the upper end of the closed hydraulic pad, and a lower copper ring is embedded at the outer peripheral step of the lower end of the closed hydraulic pad, and the outer walls of the upper copper ring and the lower copper ring are respectively against the inner wall of the cylinder.

[0011] A retaining ring is fixed to the lower end surface of the closed hydraulic cushion, and the outer edge of the retaining ring abuts against the lower inner edge of the lower copper ring; a washer is fixed to the outer periphery of the upper end surface of the closed hydraulic cushion, and the outer edge of the washer presses above the inner edge of the upper copper ring;

[0012] The workbench is symmetrically provided with workbench step holes, and each workbench step hole is respectively inserted with a guide sleeve extending downward into the inner cavity of the cylinder, and the upper end flange of each guide sleeve is fixed in the upper end large hole of the workbench step hole; each guide sleeve is respectively provided with a push rod, and the bottom of each push rod is respectively against the cushion block or the gasket, and the cushion block is at the same height as the gasket and is fixed on the upper end surface of the closed hydraulic cushion.

[0013] Furthermore, the guide sleeve and the push rod are symmetrically provided in three groups, the bottoms of the push rods on both sides abut against the washers, and the bottom of the middle push rod abuts against the cushion block.

[0014] Compared with the prior art, the utility model has achieved the following beneficial effects: the workbench pad and the ejector cylinder mounting plate can be omitted to simplify the structure; there is no need to open a large square hole in the center of the workbench, only a small hole matching the ejector rod is needed, which is more suitable for the stretching process of small molds; the closed hydraulic pad is equivalent to the movement of the cylinder piston head, and two copper rings are arranged on the periphery to make the movement of the closed hydraulic pad more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0016] Figure 1 This is the front view of the closed hydraulic pad hydraulic press of the utility model;

[0017] Figure 2 for Figure 1 A top view of

[0018] In the figure: 1. workbench; 2. guide sleeve; 3. push rod; 4. gasket; 5. cushion block; 6. closed hydraulic cushion; 7a. upper copper ring; 7b. lower copper ring; 8. retaining ring; 9. top cylinder; 10. cylinder barrel. DETAILED DESCRIPTION

[0019] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] like Figure 1 , Figure 2 As shown, the closed hydraulic pad hydraulic press of the utility model comprises a workbench 1, a guide sleeve 2, a push rod 3, a closed hydraulic pad 6, a push cylinder 9 and a cylinder barrel 10. The cylinder barrel 10 is welded at the lower middle part of the workbench 1. The push cylinder 9 is fixed to the lower port of the cylinder barrel 10. The upper end of the piston rod of the push rod 3 is fixed to a cylindrical closed hydraulic pad 6. An upper copper ring 7a is embedded at the outer peripheral step of the upper end of the closed hydraulic pad 6. A lower copper ring 7b is embedded at the outer peripheral step of the lower end of the closed hydraulic pad 6. The outer walls of the upper copper ring 7a and the lower copper ring 7b are respectively against the inner wall of the cylinder barrel 10.

[0023] A retaining ring 8 is fixed to the lower end surface of the closed hydraulic pad 6, and the outer edge of the retaining ring 8 abuts against the lower inner edge of the lower copper ring 7b; a washer 4 is fixed to the outer periphery of the upper end surface of the closed hydraulic pad 6 by countersunk screws, and the outer edge of the washer 4 is pressed above the inner edge of the upper copper ring 7a;

[0024] The workbench 1 is symmetrically provided with workbench step holes, and each workbench step hole is respectively inserted with a guide sleeve 2 extending downward into the inner cavity of the cylinder barrel 10, and the upper end flange of each guide sleeve 2 is fixed in the upper end large hole of the workbench step hole; each guide sleeve 2 is respectively provided with a push rod 3, and the bottom of each push rod 3 is respectively against the cushion block 5 or the gasket 4, and the cushion block 5 is at the same height as the gasket 4 and is fixed on the upper end surface of the closed hydraulic cushion 6.

[0025] The guide sleeve 2 and the push rod 3 are symmetrically arranged in three groups. The bottoms of the push rods 3 on both sides abut against the washers 4 , and the bottom of the middle push rod 3 abuts against the cushion block 5 .

[0026] The body of the closed hydraulic pad hydraulic press is a four-column structure with a small work surface and large tonnage. The machine tool needs to realize the stretching process. While ensuring the strength of the work table, this structure is designed to realize the stretching function, which greatly reduces the manufacturing cost. The installation process of this structure is different from that of conventional hydraulic machine tools. First, the copper ring is heated to 100℃~120℃ and assembled with the closed hydraulic pad 6. After the temperature of the copper ring returns to room temperature, the outer circle is finely processed to make the copper ring and the closed hydraulic pad 6 a whole, and then the gasket 4 and the block are installed at both ends of the closed hydraulic pad 6. The gasket 4 is quenched and tempered to play the role of the pad 5 and the role of the retaining ring to prevent the upper copper ring 7a from falling off during movement.

[0027] After the closed hydraulic cushion 6 is installed as a whole, it is connected to the top cylinder 9 by screws, and then the cushion block 5 is installed, and finally connected to the workbench by the top cylinder 9. This closed hydraulic cushion has a compact structure, a material-saving workbench, and good strength.

[0028] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A closed hydraulic pad hydraulic press, comprising a workbench, characterized in that: A cylinder is welded below the workbench, a top cylinder is fixed to the lower port of the cylinder, a cylindrical closed hydraulic pad is fixed to the upper end of the piston rod of the top rod, an upper copper ring is embedded at the outer peripheral step of the upper end of the closed hydraulic pad, and a lower copper ring is embedded at the outer peripheral step of the lower end of the closed hydraulic pad. The outer walls of the upper copper ring and the lower copper ring are respectively against the inner wall of the cylinder. A retaining ring is fixed to the lower end surface of the closed hydraulic cushion, and the outer edge of the retaining ring abuts against the lower inner edge of the lower copper ring; a washer is fixed to the outer periphery of the upper end surface of the closed hydraulic cushion, and the outer edge of the washer presses above the inner edge of the upper copper ring; The workbench is symmetrically provided with workbench step holes, and each workbench step hole is respectively inserted with a guide sleeve extending downward into the inner cavity of the cylinder, and the upper end flange of each guide sleeve is fixed in the upper end large hole of the workbench step hole; each guide sleeve is respectively provided with a push rod, and the bottom of each push rod is respectively against the cushion block or the gasket, and the cushion block is at the same height as the gasket and is fixed on the upper end surface of the closed hydraulic cushion.

2. The closed hydraulic pad hydraulic press according to claim 1, characterized in that: The guide sleeve and the push rod are symmetrically arranged in three groups, the bottoms of the push rods on both sides abut against the washers, and the bottom of the middle push rod abuts against the cushion block.

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