Cylinder-column integrated super-tonnage hydraulic machine

Abstract

The utility model discloses a cylinder-column integrated super-tonnage hydraulic machine which comprises a plurality of stand columns arranged in pairs, the upper portion of each stand column is sleeved with a main hydraulic cylinder, and a plunger is arranged in a cylinder body of each main hydraulic cylinder and is of a cylinder moving structure. The plungers are fixedly arranged on the stand columns in a sleeving mode respectively, the tops of the plungers are fixed to the lower portion of the upper base plate through screws respectively, and the upper ends of the stand columns penetrate through through holes of the upper base plate respectively and are connected with upper locking nuts in a screwed mode; a main cylinder guide sleeve is embedded in a lower port of a cylinder body of each main hydraulic cylinder, and each main cylinder guide sleeve is sleeved on the corresponding stand column and is sealed with the corresponding stand column; the bottoms of cylinder bodies of the main hydraulic cylinders are fixed to the upper end faces of the sliding blocks respectively, the middle sections of the stand columns penetrate through sliding block guide sleeves respectively, and the sliding block guide sleeves are embedded in corresponding through holes of the sliding blocks respectively. The main hydraulic cylinder can enable the sliding block to achieve super-tonnage pressing force which is multiple times of the conventional tonnage under the conventional working pressure, the equipment weight is light, the total height is low, and the workbench area is small.

Description

Technical Field

[0001] The utility model relates to a hydraulic press, in particular to a hydraulic press with an integrated cylinder column and an ultra-large tonnage, belonging to the technical field of hydraulic machine tools. Background Art

[0002] In the field of large-tonnage and small-table hydraulic applications, the liquid working pressure of general hydraulic cylinders mostly adopts ultra-high pressure design. The working pressure of the hydraulic cylinder is increased to 80 - 160 MPa through a booster device to reduce the diameter of the hydraulic cylinder, thereby reducing the design space for installing the hydraulic cylinder on the body of the hydraulic press to achieve the purpose of reducing the size of the worktable surface. At present, both the cylinder barrel and the body of the ultra-high pressure hydraulic cylinder adopt wire winding technology, which has complex processes, high manufacturing costs, long winding periods, complex auxiliary equipment, and complex winding tension control programs. The overall machine design requires multiple technologies such as ultra-high pressure seals, large-diameter ultra-high pressure filling valves, and ultra-high pressure boosting technology. Moreover, there are many inevitable defects in the ultra-high pressure wire-wound cylinder body, such as inconsistent deformation between the part wound with prestressed wires and the unwound part. In addition, the flow rate is sacrificed after boosting by the booster device, so the working speed of its slider is generally relatively slow, and restricted by the working stroke of the booster cylinder, the hydraulic cylinder designed by ultra-high pressure boosting technology often cannot adapt to a large pressing stroke, so its application range is greatly limited.

[0003] Generally, the cylinder body of the large-diameter main hydraulic cylinder is installed in the counterbore in the middle of the upper crossbeam. Since the distance between the axis of the main hydraulic cylinder and the axis of the column is far and the force arm is long, the reaction moment borne by the upper crossbeam during the pressing process is increased, and very high requirements are imposed on the strength and stiffness of the upper crossbeam. The upper crossbeam usually needs to be welded into a frame structure with a very large area and a very high height.

[0004] For a hydraulic press with a cylinder moving structure, the cylinder body of the main hydraulic cylinder needs to be installed in the counterbore in the center of the slider, resulting in a huge size of the slider. Usually, it also needs to be welded into a frame structure with a very large area and a very high height, affecting the effective opening height between the bottom of the slider and the worktable surface, increasing the overall height of the hydraulic press, and posing higher requirements for the height of the workshop. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the problem that ultra-high pressure technology is difficult to apply to large-tonnage and small-table hydraulic presses, and provide a hydraulic press with an integrated cylinder column and an ultra-large tonnage. Under normal working pressure, the main hydraulic cylinder can enable the slider to achieve an ultra-large tonnage pressing force several times that of the conventional tonnage, and the equipment is light in weight, low in total height, and small in worktable area.

[0006] To solve the above technical problems, a cylinder-column integrated extra-large tonnage hydraulic press of the present utility model includes a plurality of columns arranged in pairs. The upper parts of each column are respectively sleeved with a main hydraulic cylinder. A plunger is respectively arranged in the cylinder body of each main hydraulic cylinder and it is a cylinder-driven structure. Each plunger is respectively sleeved and fixed on the column, and the top of each plunger is respectively fixed below the upper platen by screws. The upper ends of each column respectively pass through the through holes of the upper platen and are screwed with upper locking nuts.

[0007] The lower port of the cylinder body of each main hydraulic cylinder is respectively embedded with a main cylinder guide sleeve. Each main cylinder guide sleeve is respectively sleeved on the corresponding column and is sealed with each other. The bottom of the cylinder body of each main hydraulic cylinder is respectively fixed on the upper end face of the slider. The middle sections of each column respectively pass through the slider guide sleeve. Each slider guide sleeve is respectively embedded in the corresponding through hole of the slider.

[0008] As an improvement of the present utility model, the lower parts of each column pass through the corresponding through holes of the base and the lower ends are screwed with lower locking nuts. Each lower locking nut abuts against the lower end face of the base. The middle and lower parts of each column are respectively screwed with adjusting nuts. The bottom of each adjusting nut presses on the upper end face of the base.

[0009] As a further improvement of the present utility model, split adjusting pads are respectively arranged between the top of each plunger and the upper platen. Adjusting pad lugs facilitating the removal of the split adjusting pads are respectively arranged on both sides of the split adjusting pad.

[0010] As a further improvement of the present utility model, upper platen lugs are respectively arranged on the left and right sides of the upper platen. Quick filling cylinders are respectively fixed in the upper platen ear holes of the two upper platen lugs. An axially through hollow plunger rod is arranged in the inner cavity of the quick filling cylinder. The lower end of the hollow plunger rod is connected to the top inlet of the oil distribution block. The two outlet ports on both sides of the oil distribution block are respectively connected to the high-pressure oil ports of the main cylinder lower chamber of the main hydraulic cylinder through high-pressure fabricated elbow pipes.

[0011] As a further improvement of the present utility model, a filling valve is installed at the upper port of the quick filling cylinder. A filling tank is fixed on the upper end face of the upper platen. Butterfly valves are respectively fixed at the two outlet ports of the filling tank. The outlets of the two butterfly valves are respectively connected to the inlet of the filling valve through flexible joints.

[0012] As a further improvement of the present utility model, the upper end of the hollow plunger rod abuts against the lower part of the inner step of the cylinder body of the quick filling cylinder. An annular oil cavity is arranged between the outer periphery of the hollow plunger rod and the inner wall of the cylinder body. A filling cylinder high-pressure inlet oil port communicating with the annular oil cavity is arranged on the circumferential part of the lower part of the cylinder body of the quick filling cylinder.

[0013] As a further improvement of the utility model, a liquid filling cylinder guide sleeve is embedded in the inner cavity at the lower end of the cylinder body of the rapid liquid filling cylinder, and the top of the liquid filling cylinder guide sleeve abuts against the lower part of the inner step at the lower port of the cylinder body; a cylinder port flange is fixed at the lower port of the cylinder body, and the inner step of the cylinder port flange abuts against the lower part of the outer step of the liquid filling cylinder guide sleeve. The middle part of the hollow plunger rod passes through the liquid filling cylinder guide sleeve and the cylinder port flange, and the inner circumferences of the cylinder port flange and the liquid filling cylinder guide sleeve are both sealed with the hollow plunger rod.

[0014] As a further improvement of the utility model, the lower end head of the hollow plunger rod is inserted into the top inlet of the oil distributing block and is sealed with each other. An annular groove is arranged on the outer periphery of the lower end of the hollow plunger rod, and a split snap ring is embedded in the annular groove. The split snap ring is fixed on the upper end surface of the oil distributing block by screws.

[0015] As a further improvement of the utility model, return cylinders are respectively arranged on the outer sides of the middle parts between the front and rear columns. The return cylinders are piston cylinders, and the bottom parts of the cylinder bodies are respectively fixed in the base lugs. The base lugs are welded on both sides of the upper part of the base. The upper ends of the piston rods of the return cylinders are respectively connected with the middle parts of both sides of the slider through lubricated thrust spherical plain bearings.

[0016] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. In this hydraulic press, the main hydraulic cylinders are respectively installed on four or more than six columns, and the working pressure of the main hydraulic cylinders is 25 MPa, which is the conventional working pressure of the hydraulic press. Taking a 1000T single cylinder as an example, it can generate an ultra-large tonnage more than four times that of a single cylinder.

[0017] 2. Since there is no need to install large-diameter main hydraulic cylinders in the upper crossbeam, the upper crossbeam with a frame structure and huge size is cancelled and replaced by an upper backing plate. Also, since the force-bearing part of the upper backing plate is coaxial with each column and does not bear the reaction moment, the upper backing plate only needs to use a thick steel plate for connection, which greatly reduces the total height of the equipment, the manufacturing cost and the manufacturing workload, and also reduces the equipment weight.

[0018] 3. Since each main hydraulic cylinder is respectively sleeved on the column and does not need to be fixed in the counterbore of the slider, the size of the slider is greatly reduced; in addition, most of the area of the slider is covered by the main hydraulic cylinder, and the area of the central blank area is very small. The projection of the mold fixed under the slider falls within the projection range of the main hydraulic cylinder, and the slider basically does not bear the reaction moment. Therefore, a thick steel plate can also be used, which greatly reduces the manufacturing cost and the manufacturing workload, and also increases the opening height between the slider and the workbench backing plate.

[0019] 4. The column simultaneously serves as a slider guide rod and bears the nominal force load of the main hydraulic cylinder, eliminating the need for a separately designed column.

[0020] 5. There are at least four main hydraulic cylinders, that is, one main hydraulic cylinder is arranged on each column of the four-column hydraulic press, and it can also be arranged in even numbers for extension and increase, such as 6 cylinders, 8 cylinders..., forming a hydraulic press structure with a longer tabletop. In the case of using ordinary main hydraulic cylinders, the inner dimension between the columns is only about 1 / 2 of the inner dimension of the ultra-high pressure wire-wound hydraulic press, which can greatly save the design space and manufacturing materials. If the working internal pressure of the hydraulic cylinder is increased, the inner and outer diameters of the hydraulic cylinder can be further reduced, thereby further reducing the distance between the columns of the fuselage and further reducing the tabletop size.

[0021] 6. An accurately ground adjustment pad is arranged on the top of the plunger of the main hydraulic cylinder to ensure that the closing heights of the four main cylinder plungers are equal, and it can be used to adjust the parallelism of the bottom surface of the slider relative to the workbench; the adjustment pad adopts a symmetrical split structure and has gasket lugs on both sides, which is convenient for taking out, grinding and surrounding installation.

[0022] 7. Cancel the upper oil cavity of the main hydraulic cylinder, cancel the connection between the filling valve and the upper cavity of the main cylinder, the upper cavity of the main hydraulic cylinder is no longer filled with liquid and only serves as a breathing cavity; only one oil port is arranged in the lower cavity of each main hydraulic cylinder, which serves as both the filling port when the slider moves down quickly and the high-pressure oil port during pressing.

[0023] 8. The oil inlet of the fast filling cylinder remains stationary and is connected to the pressure oil circuit through a hard pipe. The lower floating end of the fast filling cylinder is fixedly connected to the high-pressure oil port of the main hydraulic cylinder through an oil distribution block and a high-pressure bent pipe. During the lifting and lowering process of the slider, there is no high-pressure hose with relative movement, which greatly improves the reliability during the working process.

[0024] 9. The fast filling cylinder adopts a hollow plunger rod. The central channel of the hollow plunger rod serves as the filling channel, and the annular cavity outside the hollow plunger rod serves as the pressure cavity for pressurization. In this way, both the large-flow filling requirement and the high-pressure and large-tonnage pressing requirement are ensured.

[0025] 10. The main hydraulic cylinder is sleeved on the column and fixedly connected to the slider. The main cylinder guide sleeve and the slider guide sleeve jointly guide to improve the guiding accuracy. When the slider moves down quickly, the oil inlet of the upper cavity of the return cylinder is used to increase the quick-down speed; at the same time, a certain back pressure is maintained in the lower cavity of the return cylinder to reduce the hydraulic shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the present invention in detail with reference to the drawings and specific embodiments. The drawings are only provided for reference and illustration, and are not used to limit the present invention.

[0027] Figure 1 is a three-dimensional view of the cylinder-column integrated ultra-large tonnage hydraulic press of the present invention;

[0028] Figure 2 is a front view of the cylinder-column integrated ultra-large tonnage hydraulic press of the present invention;

[0029] Figure 3 is the top view of Figure 2 ;

[0030] Figure 4 is the left view of Figure 2 ;

[0031] Figure 5 is the structural schematic diagram of the main hydraulic cylinder installed on the column in the present utility model;

[0032] Figure 6 is the front view of the quick filling cylinder in the present utility model;

[0033] Figure 7 is the left sectional view of Figure 6 ;

[0034] Figure 8 is the top view of the upper backing plate in the present utility model;

[0035] Figure 9 is the sectional view of the split adjusting pad in the present utility model;

[0036] Figure 10 is the top view of the slider in the present utility model;

[0037] In the figure: 1. Liquid filling tank; 1a. Air filter; 2. Upper backing plate; 2a. Ear hole of upper backing plate;

[0038] 3. Column; 3a. Upper locking nut; 3b. Adjusting nut; 3c. Lower locking nut;

[0039] 4. Main hydraulic cylinder; 4a. High-pressure oil port of main cylinder lower cavity; 4b. Plunger; 4c. Plunger seal ring; 4d. Plunger guide ring; 4e. Gland; 4f. Gland dust seal; 4g. Muffler; 4h. Main cylinder guide sleeve; 4j. Split adjusting pad;

[0040] 5. Slider; 5a. Slider guide sleeve; 5b. Slider ear seat; 6. Butterfly valve; 7. Liquid filling valve;

[0041] 8. Quick filling cylinder; 8a. Big lock nut; 8b. High-pressure oil inlet of filling cylinder; 8c. Hollow plunger rod; 8d. Filling cylinder guide sleeve; 8e. Cylinder head flange; 8f. Split snap ring;

[0042] 9. Oil distribution block; 9a. Three-way flange; 10. High-pressure bent pipe; 11. Return cylinder; 11a. Piston rod; 12. Lubricated spherical plain bearing; 13. Workbench backing plate; 14. Base; 15. Base support ear. Detailed implementation mode

[0043] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0044] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific drawings.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0046] As Figures 1 to 10 shown, the cylinder-column integrated extra-large tonnage hydraulic press of the present utility model includes a fluid filling tank 1, an upper cushion plate 2, columns 3, a main hydraulic cylinder 4, a slider 5, a butterfly valve 6, a fluid filling valve 7, a rapid fluid filling cylinder 8, an oil distribution block 9, a return cylinder 11, a workbench cushion plate 13 and a base 14. The columns 3 are arranged in pairs, at least four. The upper parts of the columns 3 are each sleeved with a main hydraulic cylinder 4. Each main hydraulic cylinder 4 is provided with a plunger 4b in its cylinder body and is of a cylinder moving structure, that is, the cylinder body moves during the working process and the plunger 4b does not move. The columns 3 also serve as the guide for the slider 5 and bear the nominal force load of the main hydraulic cylinder 4, eliminating the need for a separately designed column.

[0047] There are at least four groups of main hydraulic cylinders 4, that is, one main hydraulic cylinder 4 is arranged on each column 3 of the four-column hydraulic press, and it can also be arranged in an even number for extension and increase, such as six cylinders, eight cylinders..., forming a hydraulic press structure with a longer table surface.

[0048] Each plunger 4b is respectively sleeved and fixed on the column 3, and the top of each plunger 4b is respectively fixed below the upper cushion plate 2 by screws. A split adjusting pad 4j is installed at the top of the plunger of the main hydraulic cylinder 4 for adjusting machining errors so that the closing heights of the plungers 4b of the four main hydraulic cylinders 4 are equal. The split adjusting pad 4j needs to be ground during the assembly process to adjust the parallelism of the bottom surface of the slider 5 relative to the workbench plane. The split adjusting pad 4j is formed by enclosing two symmetric halves, and gasket lugs are respectively arranged on the outer sides of the two halves, which is convenient for taking out, grinding or enclosing and installing.

[0049] The lower inner step of the central hole of the plunger abuts against the outer step of the corresponding column 3. The threaded sections at the upper ends of the columns 3 respectively pass through the through holes of the upper cushion plate 2 and are screwed with upper locking nuts 3a. The upper locking nuts 3a are screwed to press the upper cushion plate 2 and the split adjusting pad 4j against the top of the plunger 4b.

[0050] A relatively thick steel plate is used to manufacture the upper cushion plate 2 to replace the upper crossbeam, connecting the upper parts of the four main hydraulic cylinders 4, eliminating the welded upper crossbeam of the conventional hydraulic press, making the overall height very small, and significantly reducing the weight.

[0051] The plunger 4b is of a hollow structure, and the upper and lower central holes are matched with the column 3. A plunger sealing section is provided on the outer periphery of the lower part of the plunger 4b. A plunger seal ring 4c is embedded in the middle of the plunger sealing section. Plunger guide rings 4d are respectively provided on the upper and lower sides of the plunger seal ring 4c. Both the plunger seal ring 4c and the plunger guide rings 4d are in contact with the inner wall of the main hydraulic cylinder 4. The lower part of the plunger sealing section and the cylinder bottom form the lower chamber of the main cylinder, and the lower chamber of the main cylinder is a hydraulic chamber.

[0052] Above the plunger sealing section is the upper chamber, which is a breathing chamber. The upper port of the main hydraulic cylinder 4 is covered with a gland 4e. A through ventilation hole is provided along the radial direction of the gland 4e. The inner port of the ventilation hole communicates with the upper chamber of the main hydraulic cylinder 4. A muffler 4g is screwed at the outer end of the ventilation hole. A gland dust-proof ring 4f is embedded in the upper inner edge of the gland 4e. When the plunger 4b moves upward, the air in the upper chamber is discharged through the muffler 4g; when the plunger 4b moves downward, air is inhaled through the muffler 4g, and dust is prevented from entering.

[0053] Main cylinder guide sleeves 4h are respectively embedded at the lower ports of the cylinders of each main hydraulic cylinder 4. The lower ends of the main cylinder guide sleeves 4h are provided with outward-turned flanges, and the flanges are fixed to the lower ports of the cylinders by screws. Each main cylinder guide sleeve 4h is respectively sleeved on the corresponding column 3. Sealing rings and guide rings are embedded in the inner walls of the main cylinder guide sleeves 4h to achieve sealing and guiding.

[0054] The bottoms of the cylinders of each main hydraulic cylinder 4 are respectively fixed to the upper end faces of the sliders by screws. The sliders 5 are manufactured by cutting and blanking relatively thick steel plates. Slide guide sleeves 5a are respectively embedded in the through holes of the sliders 5. The middle sections of the columns 3 respectively pass through the slide guide sleeves 5a for mating and guiding. Guide rings and dust-proof rings are respectively installed at the upper and lower ends of the inner walls of the slide guide sleeves 5a to achieve guiding and dust-proofing.

[0055] The lower parts of the columns 3 pass through the corresponding through holes of the base 14 and the lower ends are screwed with lower locking nuts 3c. Each lower locking nut 3c abuts against the lower end face of the base 14. Adjusting nuts 3b are respectively screwed on the middle and lower parts of the columns 3. The bottoms of the adjusting nuts 3b press on the upper end face of the base 14. The workbench cushion plate 13 is located at the top of the base 14 and is opposite to the slider 5.

[0056] Upper pad lugs are respectively provided on the left and right sides of the upper pad 2, and quick-filling cylinders 8 are respectively fixed in the upper pad ear holes 2a of the two upper pad lugs. The steps of the quick-filling cylinder 8 abut against the bottom of the upper pad lugs, and a large lock nut 8a is swivel-connected to the upper outer circumference of the quick-filling cylinder 8. The large lock nut 8a is pressed on the top of the upper pad lug to fix the quick-filling cylinder 8.

[0057] A filling valve 7 is installed at the upper port of the quick filling cylinder 8, a filling box 1 is fixed to the upper end surface of the upper pad 2, an air filter 1a is installed on the top of the filling box 1, and butterfly valves 6 are fixed to the outlets on both sides of the filling box 1, and the outlets of the two butterfly valves 6 are connected to the inlet of the filling valve 7 through flexible joints.

[0058] The inner cavity of the quick filling cylinder 8 is provided with a hollow plunger rod 8c, and the large hole passing through the axis of the hollow plunger rod 8c serves as a large flow filling channel. The lower end of the hollow plunger rod 8c is inserted into the top inlet of the oil distribution block 9, and an O-ring is embedded on the outer circumference to achieve radial sealing with the inner wall of the upper port of the distribution block, which can withstand the deformation caused by the working pressure and can be reliably sealed.

[0059] An annular groove is provided on the outer periphery of the lower end of the hollow plunger rod 8c, and a split clamping ring 8f is enclosed and embedded in the annular groove and fixed to the upper end surface of the oil separator block 9 by screws. A three-way flange 9a is fixed on both sides of the oil separator block 9, and the outlet of the three-way flange 9a is connected to the flange of the high-pressure oil port 4a of the lower chamber of the main cylinder of the main hydraulic cylinder 4 through a high-pressure bent pipe 10. The bottom of the oil separator block 9 is fixed on the slider ear seat 5b, and the slider ear seat 5b is welded to both sides of the slider 5.

[0060] When the slider is about to go down, the hollow plunger rod 8c with the quick filling cylinder 8 is extended downward quickly, and the upper end of the quick filling cylinder 8 absorbs oil through the filling valve 7. The oil in the filling tank 1 enters the filling valve 7 through the butterfly valve 6, and then enters the upper port of the oil distributor block 9 through the central hole of the hollow plunger rod 8c. After the three-way distribution of the oil distributor block 9, the oil is replenished to the main hydraulic cylinder 4 from the high-pressure bent pipe 10.

[0061] The quick filling cylinder 8 is a high-pressure cylinder that can withstand a nominal liquid pressure of 25 MPa. The hollow plunger rod 8c is made of thick-walled seamless steel pipe. The upper end of the hollow plunger rod 8c is against the lower inner step of the upper part of the cylinder body of the quick filling cylinder 8. An annular oil cavity is provided between the outer periphery of the hollow plunger rod 8c and the inner wall of the cylinder body. The lower circumference of the cylinder body of the quick filling cylinder 8 is provided with a filling cylinder high-pressure oil inlet 8b that communicates with the annular oil cavity.

[0062] The inner cavity at the lower end of the cylinder body of the quick filling cylinder 8 is embedded with a filling cylinder guide sleeve 8d, and the top of the filling cylinder guide sleeve 8d abuts against the lower part of the inner step at the lower port of the cylinder body; a cylinder head flange 8e is fixed at the lower port of the cylinder body, and the inner step of the cylinder head flange 8e abuts against the lower part of the outer step of the filling cylinder guide sleeve 8d. The middle part of the hollow plunger rod 8c passes through the filling cylinder guide sleeve 8d and the cylinder head flange 8e, and the inner circumferences of the cylinder head flange 8e and the filling cylinder guide sleeve 8d are both sealed with the hollow plunger rod 8c.

[0063] There is only one oil port in the lower cavity of the cylinder body of the main hydraulic cylinder 4, which serves as both a filling oil port and a high-pressure oil port 4a for the lower cavity of the main cylinder, eliminating the need to add a high-pressure pressurizing oil port on the cylinder body.

[0064] When the slider quickly descends and switches to the working feed, the main hydraulic cylinder 4 pressurizes through the filling cylinder high-pressure oil inlet 8b of the quick filling cylinder 8 and the high-pressure bending pipe 10; since the main hydraulic cylinder 4 has a cylinder moving structure, the high-pressure bending pipe 10 and the high-pressure ports at both ends move with the cylinder body when the cylinder body moves. If a flexible hose is used for connection, the reliability of the pipeline will be reduced. The high-pressure pressurizing oil inlet is designed on the cylinder body of the quick filling cylinder 8, and the oil port is fixed and a rigid pipe is used for connection, avoiding the use of a large-diameter flexible hose for connection.

[0065] This hydraulic press can greatly reduce the height of the whole machine, especially greatly reduce the height of the slider 5 and the upper crossbeam. The structure size of the fuselage is compact, and the manufacturing cost is greatly reduced.

[0066] Return cylinders 11 are respectively arranged on the outer sides of the middle parts between the front and rear columns 3. The return cylinders 11 are piston cylinders, and the bottom parts of the cylinder bodies are respectively fixed in the base support ears 15, and the base support ears 15 are welded on both sides of the upper part of the base 14. The upper ends of the piston rods 11a of the return cylinders 11 are respectively connected to the middle parts of both sides of the slider 5 through lubricated spherical plain bearings 12.

[0067] When the piston rod 11a of the return cylinder 11 moves upward, it can push the slider 5 and its moving parts upward for return. Another advantage of using a piston cylinder is that it can provide a stable quick descent force and speed, overcoming the phenomena of insufficient quick descent and speed of the slider caused by large frictional resistance of the moving parts and uneven clearances.

[0068] For this type of hydraulic press with this structure, the slider is small in size and light in weight. Due to manufacturing and installation errors, it is easy for the moving parts of the slider to be stuck, and there is no quick descent action without an idle stroke. Then, by introducing oil into the upper cavity of the return cylinder 11 and controlling the oil inlet flow through a servo motor, it is possible to avoid the situation where the slider has no quick descent without an idle stroke or the quick descent speed fails to meet the design requirements, ensuring a stable and reliable quick descent speed of the slider. At the same time, the lower cavity of the return cylinder 11 can be controlled by a valve to give a certain back pressure to reduce hydraulic shock. The installation of lubricated spherical plain bearings 12 can improve the reliability of the connection and further avoid jamming.

[0069] Taking the main hydraulic cylinder of a 1000T single cylinder as an example, a four-cylinder combination forms a 4000-ton hydraulic press: when the liquid working pressure is 25 MPa, the inner diameter of the cylinder body is φ780 mm, the outer diameter of the cylinder body is about φ1030 mm, the diameter of the mating surface with the column is φ320 mm, and the diameter of the guiding section of the column and the slider guide sleeve 5a is φ340 mm. As long as the center distance in the left-right and front-back directions of the column is controlled to be greater than the outer diameter of the cylinder body φ1030 mm, for example, if the center distance of the column L = 1040 mm is taken, then a hydraulic press can be designed to reach 1000 * 4 = 4000 tons, and the table size inside the column is = 1040 - 340 = 700 mm.

[0070] If a single cylinder is designed according to ultra-high pressure, such as the working internal pressure of the hydraulic cylinder being 80 MPa, for the 4000T main hydraulic cylinder with wire winding on the cylinder barrel, its outer diameter of the cylinder body is about φ1200 mm. Adding the size of the machine body guide rail, the internal size inside the overall machine body or the wire-wound machine body is about 1500 mm. Therefore, the internal size inside the body of the large-tonnage hydraulic press in this solution is only about 1 / 2 of that of the ultra-high pressure wire-wound hydraulic press. Thus, the design space can be greatly saved and the manufacturing materials can be saved.

[0071] If the working internal pressure of the main hydraulic cylinder is increased, the inner and outer diameters of the oil cylinder can be further reduced, thereby further reducing the column spacing of the machine body and the table size.

[0072] The above is only a preferred and feasible embodiment of the present utility model, which shows and describes the basic principles, main features and advantages of the present utility model. It is not intended to limit the patent protection scope of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present utility model, the present utility model can have other implementation manners. The present utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model. The protection scope required by the present utility model is defined by the appended claims and their equivalents. The technical features not described in the present utility model can be realized by or adopted the existing technologies and will not be elaborated here.

Claims

1. A cylinder-column integrated super-tonnage hydraulic press, comprising a plurality of columns arranged in pairs, characterized in that: The upper part of each column is respectively equipped with a master hydraulic cylinder, and the cylinder body of each master hydraulic cylinder is respectively provided with a plunger and is a cylinder-actuated structure. Each plunger is respectively fitted and fixed on the column and the top of the plunger is respectively fixed to the bottom of the upper pad by screws. The upper end of each column passes through the through hole of the upper pad and is screwed with an upper locking nut; The lower port of the cylinder body of each master hydraulic cylinder is respectively embedded with a master cylinder guide sleeve, and each master cylinder guide sleeve is respectively sleeved on the corresponding column and sealed with each other; the bottom of the cylinder body of each master hydraulic cylinder is respectively fixed to the upper end surface of the slider, the middle section of each column passes through the slider guide sleeve, and each slider guide sleeve is respectively embedded in the corresponding through hole of the slider.

2. The cylinder-column integrated super-large tonnage hydraulic press according to claim 1, characterized in that: The lower part of each column passes through the corresponding through hole of the base and the lower end is screwed with a lower locking nut, each lower locking nut rests on the lower end surface of the base, and the middle and lower part of each column is screwed with an adjusting nut, and the bottom of each adjusting nut is pressed on the upper end surface of the base.

3. The cylinder-column integrated super-large tonnage hydraulic press according to claim 1, characterized in that: A split adjustment pad is provided between the top of each plunger and the upper pad, and two sides of the split adjustment pad are provided with adjustment pad lugs for facilitating the removal of the split adjustment pad.

4. The cylinder-column integrated super-large tonnage hydraulic press according to claim 1, characterized in that: Upper pad lugs are respectively provided on the left and right sides of the upper pad, and quick-filling cylinders are respectively fixed in the upper pad ear holes of the two upper pad lugs. The inner cavity of the quick-filling cylinder is provided with an axially penetrating hollow plunger rod, and the lower end of the hollow plunger rod is connected to the top inlet of the oil separator block, and the outlets on both sides of the oil separator block are respectively connected to the high-pressure oil port of the lower cavity of the master cylinder of the master hydraulic cylinder through high-pressure bent pipes.

5. The cylinder-column integrated super-large tonnage hydraulic press according to claim 4, characterized in that: A filling valve is installed at the upper port of the quick filling cylinder, a filling box is fixed to the upper end surface of the upper pad, butterfly valves are fixed to the two side outlets of the filling box, and the outlets of the two butterfly valves are connected to the inlet of the filling valve through flexible joints.

6. The cylinder-column integrated super-large tonnage hydraulic press according to claim 4, characterized in that: The upper end of the hollow plunger rod abuts against the lower inner step of the upper part of the cylinder body of the quick filling cylinder, an annular oil chamber is provided between the outer periphery of the hollow plunger rod and the inner wall of the cylinder body, and a filling cylinder high-pressure oil inlet is provided on the lower circumference of the cylinder body of the quick filling cylinder and communicates with the annular oil chamber.

7. The cylinder-column integrated super-large tonnage hydraulic press according to claim 4, characterized in that: A filling cylinder guide sleeve is embedded in the inner cavity at the lower end of the cylinder body of the quick filling cylinder, and the top of the filling cylinder guide sleeve abuts against the bottom of the inner step of the lower port of the cylinder body; a cylinder mouth flange is fixed to the lower port of the cylinder body, and the inner step of the cylinder mouth flange abuts against the bottom of the outer step of the filling cylinder guide sleeve, and the middle part of the hollow plunger rod passes through the filling cylinder guide sleeve and the cylinder mouth flange, and the inner periphery of the cylinder mouth flange and the filling cylinder guide sleeve are sealed with the hollow plunger rod.

8. The cylinder-column integrated super-large tonnage hydraulic press according to claim 4, characterized in that: The lower end of the hollow plunger rod is inserted into the top inlet of the oil separator block and sealed with each other. An annular groove is provided on the outer periphery of the lower end of the hollow plunger rod. A split retaining ring is embedded in the annular groove. The split retaining ring is fixed to the upper end surface of the oil separator block by screws.

9. The cylinder-column integrated super-large tonnage hydraulic press according to claim 2, characterized in that: A return cylinder is provided on the outer side of the middle part between the front and rear columns. The return cylinder is a piston cylinder and the bottom of the cylinder body is fixed in the base support ears respectively. The base support ears are welded to the upper sides of the base. The upper ends of the piston rods of the return cylinders are connected to the middle parts of the two sides of the slider through lubricated thrust spherical bearings.

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