Small-table-board large-tonnage cylinder-driven four-column hydraulic press

Abstract

The upper ends of four stand columns are connected through an upper cross beam, a main cylinder is installed in the center of the upper cross beam, a sliding block is connected to the lower portion of the main cylinder, the lower ends of the four stand columns are connected through a lower cross beam, a workbench is fixed to the top of the lower cross beam, and a cylinder body of the main cylinder is fixed into a counter bore in the upper end face of the sliding block. The main cylinder plunger rod is a step shaft, the large end of the main cylinder plunger rod is located in the cylinder body, the small end of the upper portion of the main cylinder plunger rod penetrates through a center hole of the upper cross beam, the upper end of the main cylinder plunger rod is connected with a main cylinder large lock nut in a screwed mode, and the outer step face of the main cylinder plunger rod abuts against the lower bottom face of the upper cross beam. A through plunger rod center hole which is narrow in top and wide in bottom is formed along the axis of the main cylinder plunger rod, a horn mouth for fixing a prefill valve is formed in the upper end of the plunger rod center hole, and a plunger rod oil inlet hole which is through in the radial direction is formed in the side wall, exposed out of the cylinder body, of the upper portion of the upper end of the main cylinder plunger rod. The hydraulic machine greatly reduces the size of an upper cross beam main cylinder mounting hole, reduces the projection appearance size of the upper cross beam, and saves the manufacturing cost of the whole machine.

Description

Technical Field

[0001] The utility model relates to a hydraulic press, in particular to a small-table and large-tonnage cylinder-driven four-column hydraulic press, belonging to the technical field of hydraulic machine tools. Background Art

[0002] The body of a traditional large-table hydraulic press consists of four columns, the upper ends of which are connected by an upper crossbeam. A master cylinder is installed in the center of the upper crossbeam, and a slider is connected to the lower end of the master cylinder. Below the slider is a workbench. The master cylinder usually uses a plunger cylinder. In conventional large-tonnage plunger cylinders, the cylinder body is stationary, the plunger rod moves, and the cylinder barrel is installed in the inner hole of the upper crossbeam.

[0003] The defects of the traditional structure are: the outer diameter of the cylinder of the large-tonnage hydraulic cylinder is huge. If the table width of the workbench is larger than the outer diameter of the cylinder, the corresponding upper crossbeam size is relatively large to accommodate the large-diameter cylinder. If the table width required by the hydraulic press is smaller than the outer diameter of the cylinder of the hydraulic cylinder, the size of the upper crossbeam and the center distance of the column need to be increased, making the body size, especially the width, significantly larger than the width of the workbench, making the hydraulic press design inconsistent and inconvenient for manual operation. Utility Model Content

[0004] The purpose of the utility model is to overcome the problems existing in the prior art and provide a small-table large-tonnage cylinder-driven four-column hydraulic press, which greatly reduces the size of the main cylinder mounting hole of the upper crossbeam, reduces the projected external dimensions of the upper crossbeam, and saves the manufacturing cost of the entire machine.

[0005] In order to solve the above technical problems, the utility model discloses a small-table large-tonnage cylinder-driven four-column hydraulic press, comprising four columns, the upper ends of the four columns are connected by an upper crossbeam, a master cylinder is installed at the center of the upper crossbeam, a slider is connected below the master cylinder, the lower ends of the four columns are connected by a lower crossbeam, a workbench is fixed on the top of the lower crossbeam, the cylinder body of the master cylinder is fixed in the countersunk hole on the upper end surface of the slider, the master cylinder plunger rod is a step shaft and the large end is located in the cylinder body, the upper small end of the master cylinder plunger rod passes through the central hole of the upper crossbeam and the upper end is screwed with a master cylinder large lock nut, and the outer step surface of the master cylinder plunger rod abuts against the lower bottom surface of the upper crossbeam;

[0006] A plunger rod center hole which is narrow at the top and wide at the bottom and passes through is provided along the axis of the master cylinder plunger rod, a bell mouth for fixing a filling valve is provided at the upper end of the plunger rod center hole, and a plunger rod oil inlet hole which passes through in a radial direction is provided on the side wall of the cylinder body exposed above the upper end of the master cylinder plunger rod.

[0007] As an improvement of the present utility model, four master cylinder lugs are symmetrically arranged on the upper part of the cylinder body of the master cylinder, and a through hole is processed at the center of each master cylinder lug and a master cylinder guide sleeve is installed thereon; through holes are respectively arranged at the four corners of the slider and a slider guide sleeve is respectively installed thereon, and the master cylinder guide sleeve and the slider guide sleeve are both mounted on the corresponding columns to guide the slider together.

[0008] As a further improvement of the present invention, the sliding block is a thick steel plate.

[0009] As a further improvement of the utility model, the outer periphery of the master cylinder plunger rod is sealed with the inner wall of the cylinder body by means of multiple V-shaped combined sealing rings, a stepped sealing ring gland is fixed to the upper port of the cylinder body, the lower small end of the sealing ring gland is inserted into the inner cavity of the cylinder body and pressed on the top of the V-shaped combined sealing ring, and an adjustment pad with a U-shaped opening is provided under each fixing bolt of the sealing ring gland.

[0010] As a further improvement of the utility model, a return cylinder is respectively installed between a pair of columns on the left and right sides, and the return cylinder is a piston cylinder and the top of the piston rod is connected to the bottom of the sliding block.

[0011] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. It makes full use of the characteristics of large cross-sectional area of ​​the cylinder barrel and small cross-sectional area of ​​the plunger rod, designs the plunger rod as a stepped shaft variable cross-sectional structure, further reduces the diameter of the upper beam mounting hole, greatly reduces the overall dimensions of the upper beam, and then reduces the overall dimensions of the lower beam and the slider, saving materials for manufacturing the fuselage and reducing manufacturing costs.

[0012] 2. The return cylinder is set in the inner gear of the columns on both sides of the fuselage, and adopts a piston cylinder structure. When returning, the slider and the cylinder body are pushed upward to move upward to achieve the return. Another significant advantage of using a piston return cylinder is that the friction resistance of the V-shaped combined seal ring used in the main cylinder is large, and the processing error of the guide sleeve increases the friction resistance of the moving part. In addition, the slider is small in size and light in weight. The slider often moves slowly when it moves downward quickly due to its own weight, or because the oil temperature rises, the seal ring expands due to heat, and sometimes the plunger rod is not able to move downward quickly. In this case, the rod cavity of the return cylinder can be used to fill oil to pull the slider downward to achieve rapid descent and improve work efficiency. Since the cylinder diameter and rod diameter of the return cylinder are both small, the slider can achieve a faster movement speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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.

[0014] Figure 1 This is the front view of the utility model of a small-table, large-tonnage cylinder-driven four-column hydraulic press;

[0015] Figure 2 for Figure 1 Left view of;

[0016] Figure 3 This is a schematic diagram of the structure of the plunger cylinder in the utility model;

[0017] Figure 4 for Figure 3 A top view of

[0018] In the figure: 1. Upper crossbeam; 2. Post; 2a. Lock nut on post; 2b. Upper adjusting nut; 2c. Lower adjusting nut; 2d. Lock nut on post; 3. Master cylinder; 3a. Large lock nut of master cylinder; 3b. Plunger rod of master cylinder; 3c. Center hole of plunger rod; 3d. Oil inlet hole of plunger rod; 3e. Lug of master cylinder; 3f. Guide sleeve of master cylinder; 3g. Sealing ring gland; 3h. Adjusting pad; 3j. V-type combined sealing ring; 4. Slider; 4a. Slider guide sleeve; 5. Workbench; 6. Lower crossbeam; 7. Return cylinder. 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 Figures 1 to 4 As shown, the small-table large-tonnage cylinder-type four-column hydraulic press of the utility model comprises a column 2, an upper crossbeam 1, a main cylinder 3, a slider 4, a workbench 5 and a lower crossbeam 6. The upper ends of the four columns 2 are connected through the upper crossbeam 1, and the lower ends of the four columns 2 are connected through the lower crossbeam 6. The upper ends of the columns 2 are respectively screwed with a column upper lock nut 2a, and the bottom of the column upper lock nut 2a is pressed on the upper crossbeam 1. The upper part of the column 2 is also screwed with an upper adjustment nut 2b, and the upper adjustment nut 2b is pressed under the upper crossbeam 1. The lower ends of the columns 2 are respectively screwed with a column lower lock nut 2d, and the lower lock nut 2d of each column is respectively against the bottom of the lower crossbeam 6. The lower part of the column 2 is also screwed with a lower adjustment nut 2c, and the lower adjustment nut 2c is pressed on the top of the lower crossbeam 6.

[0023] The master cylinder 3 is installed at the center of the upper crossbeam 1. The lower end of the master cylinder 3 is connected to a slide block 4. The workbench 5 is located at the top of the lower crossbeam 6 and below the slide block 4. The master cylinder 3 adopts a cylinder dynamic structure. The master cylinder plunger rod 3b is a hollow step shaft. The outer diameter of the part that matches the master cylinder body is large, and the outer diameter is determined according to the nominal force of the master cylinder and the working pressure of the liquid. The upper reduced diameter part is installed in the inner hole of the upper crossbeam of the hydraulic press.

[0024] A through plunger rod center hole 3c is provided along the axis of the master cylinder plunger rod 3b. The diameter of the upper bell mouth of the plunger rod center hole 3c can be selected according to the size of the filling valve installed on its top, and the wall thickness of the master cylinder plunger rod 3b can be selected according to the calculation formula of the cylinder wall thickness. Entering the large end of the plunger rod, the plunger rod center hole 3c naturally transitions to the large diameter section. The outer step surface of the master cylinder plunger rod 3b abuts against the lower bottom surface of the upper crossbeam of the hydraulic press, and the upper end of the master cylinder plunger rod 3b is locked and fixed by the master cylinder large lock nut 3a. The salient feature of the master cylinder is that the master cylinder plunger rod 3b is fixed, and the cylinder body drives the slider 4 to move.

[0025] Another notable feature is that four master cylinder lugs 3e are welded on the outer circle of the upper part of the master cylinder body, and through holes are respectively processed in the centers of the master cylinder lugs 3e for installing the master cylinder guide sleeves 3f, which cooperate with the column 2 for guidance. The slider 4 is made of a thick plate, and through holes are also processed at the four corners of the slider 4, and the slider guide sleeves 4a are installed to cooperate with the fuselage column for guidance.

[0026] The upper part of the slider 4 and the contact surface with the oil cylinder are processed with a countersunk hole, and the cylinder body of the master cylinder is embedded in the countersunk hole to prevent the cylinder body from moving. The cylinder body and the slider 4 are reversely fixed by countersunk screws. The master cylinder guide sleeve 3f and the slider guide sleeve 4a guide together to increase the guide length and improve the guide accuracy. In this way, the height of the slider can be greatly reduced. It is made of thick steel plates, which can greatly save materials and reduce the length of the column 2 and the height of the fuselage.

[0027] The hollow structure of the master cylinder plunger rod 3b can greatly reduce the weight, and at the same time, it serves as an oil through hole. The exposed part of the upper step surface of the plunger is provided with a plunger rod oil inlet hole 3d, which is used as a pressurized hole. A filling valve is installed on the upper part of the center hole of the master cylinder plunger rod 3b, which is used to fill the master cylinder with liquid and oil when it descends quickly and to drain the oil when it returns quickly. The sealing ring adopts a multi-channel V-shaped combined sealing ring 3j, which has a simple structure and a long service life. The sealing ring gland 3g is designed to be stepped, and it cooperates with the cylinder barrel to press the sealing ring at the same time. A U-shaped adjustment pad 3h is provided under each fixing bolt of the sealing ring gland 3g. All adjustment pads 3h are of the same height, which are used to control the tightness of the sealing ring and can also be used to compensate for the wear of the sealing ring. The U-shaped structure does not need to loosen all the gland fixing bolts to be replaced, which improves efficiency.

[0028] A return cylinder 7 is installed between a pair of columns 2 on the left and right sides, and the return cylinder 7 is a piston cylinder and the top of the piston rod is connected to the bottom of the slider. When the slider is about to go down, the rod cavity of the return cylinder 7 enters oil, and the slider is quickly pulled down.

[0029] 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 cylinder-driven four-column hydraulic press with a small table and large tonnage, comprising four columns, the upper ends of the four columns are connected by an upper crossbeam, a main cylinder is installed at the center of the upper crossbeam, a slider is connected below the main cylinder, the lower ends of the four columns are connected by a lower crossbeam, a workbench is fixed on the top of the lower crossbeam, and the characteristics are: The cylinder body of the master cylinder is fixed in the countersunk hole on the upper end surface of the slider, the master cylinder plunger rod is a stepped shaft and the large end is located in the cylinder body, the upper small end of the master cylinder plunger rod passes through the central hole of the upper cross beam and the upper end is screwed with a master cylinder large lock nut, and the outer step surface of the master cylinder plunger rod abuts against the lower bottom surface of the upper cross beam; A plunger rod center hole which is narrow at the top and wide at the bottom and passes through is provided along the axis of the master cylinder plunger rod, a bell mouth for fixing a filling valve is provided at the upper end of the plunger rod center hole, and a plunger rod oil inlet hole which passes through in a radial direction is provided on the side wall of the cylinder body exposed above the upper end of the master cylinder plunger rod.

2. The small-table, large-tonnage, cylinder-driven four-column hydraulic press according to claim 1, characterized in that: The upper part of the cylinder body of the master cylinder is symmetrically provided with four master cylinder lugs, and the center of each master cylinder lug is respectively processed with a through hole and a master cylinder guide sleeve is installed; the four corners of the slider are respectively provided with through holes and a slider guide sleeve is respectively installed, and the master cylinder guide sleeve and the slider guide sleeve are both mounted on the corresponding columns to guide the slider together.

3. The small-table, large-tonnage, cylinder-driven four-column hydraulic press according to claim 1, characterized in that: The sliding block is a thick steel plate.

4. The small-table, large-tonnage, cylinder-driven four-column hydraulic press according to claim 1, characterized in that: The outer periphery of the master cylinder plunger rod is sealed with the inner wall of the cylinder body by multiple V-shaped combined sealing rings. A stepped sealing ring gland is fixed to the upper port of the cylinder body. The lower small end of the sealing ring gland is inserted into the inner cavity of the cylinder body and pressed on the top of the V-shaped combined sealing ring. An adjustment pad with a U-shaped opening is provided under each fixing bolt of the sealing ring gland.

5. The small-table, large-tonnage, cylinder-driven four-column hydraulic press according to any one of claims 1 to 4, characterized in that: A return cylinder is installed between a pair of upright posts on the left and right sides respectively. The return cylinder is a piston cylinder and the top of the piston rod is connected to the bottom of the sliding block.

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