A single-acting short-stroke composite hydraulic press

Abstract

The present invention discloses a single-acting short-stroke composite hydraulic press, which belongs to the technical field of hydraulic presses. The single-acting short-stroke composite hydraulic press comprises an upper die seat, a lower die seat, a fixed seat, a forming cavity assembly block, and a driving unit. The driving unit is used to drive the forming cavity assembly block to move, so that the arc grooves on the four forming cavity assembly blocks surround a forming cavity. A forming pressure head is fixedly connected to the downward side of the upper die seat, and the forming pressure head and the forming cavity are used in conjunction with each other. In the present invention, the four forming cavity assembly blocks move closer to each other, and the four arc grooves are spliced ​​into a forming cavity. After the forming pressure head forms the composite material plate, the four forming cavity assembly blocks move away from each other, so that the inner wall of the forming cavity is out of contact with the surface of the formed composite material plate, so that the worker does not need to spend much effort to remove the formed composite material plate, thereby avoiding affecting the surface appearance quality of the composite material plate workpiece.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic presses, and in particular relates to a single-acting short-stroke composite material hydraulic press. Background Art

[0002] A hydraulic press is a machine that uses the static pressure of liquid to work. It is mainly used to transfer energy to process various materials, such as metal, plastic, rubber, wood and powder. It usually consists of three parts: the main machine, the power system and the hydraulic control system. The classification of hydraulic presses includes valve hydraulic presses, liquid hydraulic presses and engineering hydraulic presses. The structure of the hydraulic press can be distinguished according to the direction and type of force. According to the direction of force, hydraulic presses are divided into vertical and horizontal types, among which vertical hydraulic presses are more common, while hydraulic presses for extrusion are mostly horizontal. According to the structural type, hydraulic presses are of two types, namely double-column, four-column, eight-column, welded frame and multi-layer steel belt winding frame. Medium and small vertical hydraulic presses may also adopt C-type frame, which is open on three sides and easy to operate, but has relatively poor rigidity. The welded frame hydraulic press for stamping has better rigidity, open front and back, but closed left and right. The cylinder of the hydraulic press is fixed in the upper beam, the plunger is rigidly connected to the movable crossbeam, and the movable crossbeam is guided by the column and moves up and down under the pressure of the working fluid. The crossbeam is equipped with a workbench that can move forward and backward. The upper anvil and the lower anvil are installed under the workbench and the movable crossbeam respectively. The working force is borne by the frame composed of the upper and lower crossbeams and columns. The uses of hydraulic presses are very wide, including but not limited to metal pressing, forging, stamping and other processes. Because hydraulic presses can provide strong and precise pressure, they play an important role in the manufacturing industry.

[0003] When the existing single-acting short-stroke hydraulic press is press-forming a workpiece such as a composite material plate, the workpiece is first placed on the lower die seat, and then the lower die seat is lifted by the cylinder of the hydraulic press, so that the lower die seat drives the workpiece to move upward, and the workpiece is pressed into the forming cavity of the lower die seat by the forming ram of the upper die seat, thereby press-forming the workpiece. However, due to the large stress generated in the process of the workpiece being squeezed into the forming cavity, the surface of the workpiece and the inner wall of the forming cavity have a large clamping force. After press-forming, when the workpiece is taken out of the forming cavity, the surface of the workpiece and the inner wall of the forming cavity have a large friction resistance. The worker needs to expend a lot of effort to take the workpiece out, which results in a large physical labor intensity for the worker. When the workpiece is taken out, the surface of the workpiece and the inner wall of the forming cavity will produce large scratches, which affects the surface appearance quality of the workpiece. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a single-acting short-stroke composite hydraulic press.

[0005] The technical solution adopted to solve the above technical problems is: a single-action short-stroke composite hydraulic press, including an upper die base and a lower die base of the hydraulic press, and also including:

[0006] A fixed base connected to the lower die base;

[0007] Four forming cavity assembly blocks are slidably connected to the top surface of the fixing seat in an array along the axial direction of the fixing seat, and an arc groove is formed on the outer wall of one side of the forming cavity assembly block;

[0008] A driving unit is arranged on the molding cavity assembly block, and the driving unit is used to drive the molding cavity assembly block to move toward the center line direction of the lower mold base when the lower mold base moves upward, so that the arc grooves on the four molding cavity assembly blocks form a molding cavity, and a molding pressure head is fixedly connected to the downward side of the upper mold base, and the molding pressure head and the molding cavity are used in combination.

[0009] Through the above technical scheme, the four forming cavity assembly blocks move closer to each other, and the four arc grooves are spliced ​​into a forming cavity. After the forming pressure head forms the composite material sheet, the four forming cavity assembly blocks move away from each other, so that the inner wall of the forming cavity is out of contact with the surface of the formed composite material sheet, so that workers do not need to spend a lot of effort to remove the formed composite material sheet, and at the same time, the mold cavity will not cause scratches and wear on the surface of the composite material sheet, thereby avoiding affecting the surface appearance quality of the composite material sheet workpiece.

[0010] Furthermore, the hydraulic press also includes a lifting cylinder, the upper end of which is fixedly connected to a lifting seat, the upper die seat is connected above the lifting seat through a plurality of columns, and the lower die seat is connected to the output end of the lifting cylinder.

[0011] Through the above technical solution, the lower die base is driven by the lifting cylinder to move, so that the lower die base and the upper die base are closed. When closing the mold, the forming pressure head will generate extrusion force on the composite material plate, thereby pressing the composite material plate into shape in the forming cavity.

[0012] Furthermore, the hydraulic press also includes an oil station installed on the outside of the lifting cylinder, and the oil station is used in conjunction with the lifting cylinder.

[0013] Through the above technical solution, the oil station supplies oil to the jacking cylinder and can adjust the hydraulic pressure of the jacking cylinder, thereby controlling the pressure on the surface of the composite material plate when the upper mold base and the lower mold base are closed.

[0014] Furthermore, the hydraulic press also includes an electric control cabinet, which is used to control the start and stop of the oil station.

[0015] Through the above technical solution, the start and stop of the oil station can be controlled by the electric control cabinet, and then the telescopic stroke and hydraulic pressure of the jacking cylinder can be controlled and adjusted.

[0016] Furthermore, the driving unit includes a fixed plate connected to the bottom surface of the upper mold base, a movable block is fixedly connected to the outer wall of one side of the molding cavity assembly block, a sliding groove for the movable block to engage with the fixed seat surface is provided, and the movable block slides freely in the sliding groove, a short shaft is connected to the top of the movable block, and a accommodating cavity corresponding to the short shaft is provided on the downward side of the fixed plate, a ramp section is provided on the inner wall of the accommodating cavity, and the short shaft is used in conjunction with the ramp section, and an elastic top-butting component for driving the molding cavity assembly block to move toward the outer side of the fixed seat is provided on the fixed seat.

[0017] Through the above technical scheme, when the upper die seat and the lower die seat are closed, the end of the short shaft will be inserted into the accommodating cavity and contact with the inclined surface of the ramp section. As the lower die seat continues to move upward to close the mold, the end of the short shaft will slide on the inclined surface of the ramp section, thereby driving the short shaft to move inwardly toward the center line of the fixed seat, and driving the forming cavity assembly block to move inwardly toward the center line of the fixed seat synchronously, until the four arc grooves on the four forming cavity assembly blocks are spliced ​​into a forming cavity, so that the composite material sheet workpiece can be pressed and formed. After the pressing and forming operation is completed, the lower die seat moves downward, and the forming cavity assembly block is driven to move in the opposite direction through the elastic support assembly, so that the surface of the composite material sheet workpiece is separated from the contact with the inner wall of the forming cavity. In this way, when the composite material sheet workpiece is removed, the surface of the composite material sheet workpiece will not be scratched and worn with the inner wall of the forming cavity, thereby avoiding affecting the surface quality of the composite material sheet workpiece.

[0018] Furthermore, a ball is rotatably embedded at the top end of the short shaft.

[0019] Through the above technical solution, when the upper die base and the lower die base are closed, the balls will roll on the inclined surface of the ramp section, replacing the sliding of the end of the short shaft on the inclined surface of the ramp section, reducing the wear on the end of the short shaft, and also reducing the extrusion wear on the inclined surface of the ramp section.

[0020] Furthermore, an avoidance hole is opened on the inner wall of the slope section, and the diameter of the avoidance hole matches the outer diameter of the short shaft.

[0021] Through the above technical solution, when the ball rolls from the inclined surface of the ramp section into the avoidance hole, the upper mold base and the lower mold base are still in the process of moving closer to each other, so the short shaft will be inserted into the avoidance hole. In this way, when the upper mold base and the lower mold base continue to close the mold, the four molding cavity combination blocks will not continue to move, so that the composite material sheet can be effectively pressed and formed.

[0022] Furthermore, the elastic abutment assembly includes a guide shaft horizontally penetrated through the outer wall of the fixed seat, the outer wall of the movable block is provided with a guide hole for the guide shaft to pass freely, a return spring is wound around the periphery of the guide shaft, and the two ends of the return spring in the elastic force direction elastically abut the outer wall of the movable block and the inner wall of the sliding groove respectively.

[0023] Through the above technical solution, when the four molding cavity assembly blocks move toward the inner side of the center line of the fixed seat, they will drive the four movable blocks to squeeze the four reset springs respectively, so that the reset springs are compressed and accumulate elastic potential energy. After the mold is closed, the elastic potential energy of the reset springs is released, thereby driving the movable blocks to move away from the fixed seat, thereby separating the four molding cavity assembly blocks.

[0024] Furthermore, a lifting column is vertically penetrated through the top of the fixed seat, and a spline hole is opened on the top surface of the fixed seat for the lifting column to pass freely, and the lifting column and the hole wall of the spline hole form a spline connection. A lifting unit is provided in the fixed seat, and the lifting unit is used to drive the lifting column to move upward when the molding cavity assembly block moves toward the radial outer side of the fixed seat, so that the top surface of the lifting column protrudes to the top surface of the fixed seat.

[0025] Through the above technical scheme, when the upper mold base and the lower mold base are closing the mold, the movement of the molding cavity assembly block causes the jacking unit to drive the jacking column to move downward until the upper end surface of the jacking column is flush with the top surface of the fixed seat. After the molding operation is completed, the four molding cavity assembly blocks move away from each other, which will cause the jacking unit to drive the jacking column to move upward, thereby enabling the jacking column to lift the bottom of the pressed composite material sheet workpiece upward, so that the composite material sheet workpiece can be slightly lifted up after the pressing and molding is completed, thereby allowing the upper side edge of the composite material sheet workpiece to protrude above the molding cavity assembly block, so that workers can take the composite material sheet workpiece for unloading.

[0026] Furthermore, the lifting unit includes a rotating sleeve rotatably connected to the fixed seat, the rotating sleeve is coaxially provided with a sliding hole for the lifting column to pass freely, a movable steel ball is rotatably embedded in the periphery of the lower side of the lifting column, the hole wall of the sliding hole is provided with a spiral rolling groove for the movable steel ball to engage, the movable steel ball rolls freely in the spiral rolling groove, a driving rod is horizontally fixed to the outer wall of one side of the movable block, the driving rod slides freely horizontally in the fixed seat, a rack section is provided on the outer wall of one side of the driving rod adjacent to the rotating sleeve, and a gear section meshing with the rack section is provided on the periphery of the rotating sleeve.

[0027] Through the above technical scheme, when the upper mold base and the lower mold base are closing the mold, the lower mold base will move toward the direction of the upper mold base, so that the ball at the end of the short shaft will contact the inclined surface of the ramp section in the accommodating cavity, and then the ball will roll on the inclined surface, generating a horizontal force on the short shaft. Driven by the horizontal force, the short shaft will drive the movable block and the molding cavity combination block to move in the direction of the inner side of the center line of the fixed seat, so that the movable block can drive the driving rod to move in the direction of the rotating sleeve, so that the gear section on the periphery of the rotating sleeve is meshed with the rack section on the driving rod, and then the rotating sleeve can be driven to rotate. When the rotating sleeve rotates, the movable steel ball will roll in the spiral rolling groove. Since the lifting column and the sliding hole are splined, When the rotating sleeve rotates, the jacking column is driven to move downward until the short shaft is inserted into the avoidance hole, the top surface of the jacking column is flush with the top surface of the fixed seat, and there is no gap between the periphery of the jacking column and the hole wall of the sliding hole, so that the interior of the forming cavity is in a closed state. After the pressing and molding is completed, the upper die seat and the lower die seat are separated from each other, and the reset spring drives the movable block to move in the opposite direction, so that the rack section on the driving rod and the gear section on the rotating sleeve are engaged and rotated in the opposite direction, so that the jacking column moves upward. When the jacking column moves upward, it can produce a jacking effect on the bottom of the composite material sheet workpiece after the pressing and molding, so that the composite material sheet workpiece is jacked up, so that the staff can unload the composite material sheet workpiece.

[0028] The beneficial effects of the present invention are as follows:

[0029] In the present invention, the four forming cavity assembly blocks move toward each other, and the four arc grooves are spliced ​​into a forming cavity. After the forming pressure head forms the composite material plate, the four forming cavity assembly blocks move away from each other, so that the inner wall of the forming cavity is out of contact with the surface of the formed composite material plate, so that the worker does not need to spend much effort to remove the formed composite material plate, and the mold cavity will not cause scratches and wear on the surface of the composite material plate, thereby avoiding affecting the surface appearance quality of the composite material plate workpiece;

[0030] In the present invention, when the upper die seat and the lower die seat are molded, the end of the short shaft will be inserted into the accommodating cavity and contact with the inclined surface of the ramp section. As the lower die seat continues to move upward to close the mold, the end of the short shaft will slide on the inclined surface of the ramp section, thereby driving the short shaft to move toward the inner side of the center line of the fixed seat, and driving the forming cavity assembly block to move synchronously toward the inner side of the center line of the fixed seat, until the four arc grooves on the four forming cavity assembly blocks are spliced ​​into a forming cavity, so that the composite material plate workpiece can be pressed and formed. After the pressing and forming operation is completed, the lower die seat moves downward, and the forming cavity assembly block is driven to move in the opposite direction through the elastic supporting assembly, so that the surface of the composite material plate workpiece is separated from the contact with the inner wall of the forming cavity. In this way, when the composite material plate workpiece is removed, the surface of the composite material plate workpiece will not be scratched and worn with the inner wall of the forming cavity, thereby avoiding affecting the surface quality of the composite material plate workpiece.

[0031] In the present invention, when the upper mold base and the lower mold base are closing the mold, the lower mold base will move toward the direction of the upper mold base, so that the ball at the end of the short shaft will contact the inclined surface of the ramp section in the accommodating cavity, and then the ball will roll on the inclined surface, generating a horizontal force on the short shaft. Driven by the horizontal force, the short shaft will drive the movable block and the molding cavity combination block to move in the direction inside the center line of the fixed seat, so that the movable block can drive the driving rod to move in the direction of the rotating sleeve, so that the gear section on the periphery of the rotating sleeve is meshed with the rack section on the driving rod, and then the rotating sleeve can be driven to rotate. When the rotating sleeve rotates, the movable steel ball will roll in the spiral rolling groove. Since the lifting column and the sliding hole are splined, the rotating sleeve When the sleeve rotates, the jacking column is driven to move downward until the short shaft is inserted into the avoidance hole, the top surface of the jacking column is flush with the top surface of the fixed seat, and there is no gap between the periphery of the jacking column and the hole wall of the sliding hole, so that the interior of the forming cavity is in a closed state. After the pressing and molding is completed, the upper die seat and the lower die seat are separated from each other, and the reset spring drives the movable block to move in the opposite direction, so that the rack section on the driving rod and the gear section on the rotating sleeve are engaged and rotated in the opposite direction, so that the jacking column moves upward. When the jacking column moves upward, it can produce a jacking effect on the bottom of the composite material sheet workpiece after the pressing and molding, so that the composite material sheet workpiece is jacked up, so that the staff can unload the composite material sheet workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a single-acting short-stroke composite material hydraulic press in the present invention;

[0033] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0034] Figure 3It is a schematic diagram of the structure after the fixing plate, the fixing seat and the forming cavity assembly block are assembled in the present invention;

[0035] Figure 4 yes Figure 3 Schematic diagram of the positional relationship after the middle part of the structure is cut open;

[0036] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point A;

[0037] Figure 6 yes Figure 3 The structural diagram after the fixing plate and the fixing seat are omitted;

[0038] Figure 7 yes Figure 6 A schematic diagram of the structure from another perspective;

[0039] Figure 8 It is a schematic diagram of the structure after the rotating sleeve and the lifting column are assembled in the present invention;

[0040] Fig. 9 yes Figure 8 Schematic diagram of the explosion decomposition of the structure in the middle;

[0041] Fig.10 yes Figure 8 Schematic diagram of the positional relationship after the middle part of the structure is cut open.

[0042] Figure numerals: 1. Oil station; 2. Column; 3. Lifting column; 4. Electric control cabinet; 5. Upper die seat; 6. Fixed plate; 7. Molding cavity assembly block; 8. Fixed seat; 9. Lower die seat; 10. Lifting seat; 11. Lifting cylinder; 12. Molding pressure head; 13. Arc groove; 14. Short shaft; 15. Movable block; 16. Guide shaft; 17. Sliding groove; 18. Ball; 19. Avoidance hole; 20. Reset spring; 21. Rotating sleeve; 22. Gear section; 23. Accommodating cavity; 24. Ramp section; 25. Spiral rolling groove; 26. Rack section; 27. Molding cavity; 28. Driving rod; 29. ​​Movable steel ball. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] like Figure 1-Figure 10As shown, this embodiment provides a single-acting short-stroke composite hydraulic press, which includes a base and a lifting cylinder 11. The lifting cylinder 11 is installed on the base. The upper end of the lifting cylinder 11 is fixedly connected to a lifting seat 10. A plurality of ear blocks are welded to the side wall of the lifting seat 10. A column 2 is vertically fixedly connected to the ear block. An upper die seat 5 is commonly installed on the upper ends of the plurality of columns 2. A lower die seat 9 is connected to the top of the lifting seat 10. The upper die seat 5 is located above the lower die seat 9, and the lower die seat 9 is in a corresponding state with the upper die seat 5. The output end of the lifting cylinder 11 is connected to the bottom driving connection of the lower die seat 9. , so that the jacking cylinder 11 can drive the lower die base 9 to move vertically. The outer side of the jacking cylinder 11 is equipped with an oil station 1, and the oil station 1 includes an oil pump and an oil tank. The oil pump transports the hydraulic oil in the oil tank to the jacking cylinder 11, thereby supplying oil to the jacking cylinder 11. In addition, the oil station 1 can also adjust the hydraulic pressure of the jacking cylinder 11. The hydraulic press is also equipped with an electric control cabinet 4, which is electrically connected to the oil station 1, so that the electric control cabinet 4 can control and adjust the oil pump of the oil station 1, thereby controlling and adjusting the hydraulic pressure and telescopic stroke generated by the jacking cylinder 11;

[0045] The top surface of the fixed seat 8 is provided with a sliding groove 17 in the form of a through hole at each of the four corners, and a movable block 15 is mounted in each sliding groove 17. The movable block 15 can move in the inner and outer directions of the center line of the fixed seat 8 in the corresponding sliding groove 17. The movable block 15 is integrally formed with a molding cavity assembly block 7. The four molding cavity assembly blocks 7 are arranged in an axial array with the center line of the fixed seat 8 as the axial line. A guide shaft 16 is horizontally penetrated on the outer wall of the fixed seat 8. A guide hole for the guide shaft 16 to pass freely is provided on the outer wall of the movable block 15, so that the movable block 15 will not be separated from the sliding groove 17 when sliding in the sliding groove 17. In addition, an arc groove 13 is provided on the side of the molding cavity assembly block 7 facing the inner side of the center line of the fixed seat 8, and when the four molding cavity assembly blocks 7 move in the inner direction of the center line of the fixed seat 8, the four arc grooves 13 can be spliced ​​into a molding cavity 27. A molding pressure head 12 is fixedly connected to the downward side of the upper mold base 5, and the molding pressure head 12 and the molding cavity 27 are used in conjunction with each other;

[0046] The bottom surface of the upper die seat 5 is connected with a fixed plate 6 by screws, and the top of the movable block 15 is vertically connected with the short shaft 14. The downward side of the fixed plate 6 is provided with a receiving cavity 23 corresponding to the short shaft 14. The inner wall of the receiving cavity 23 is provided with a slope section 24. The short shaft 14 cooperates with the slope section 24. The top of the short shaft 14 is rotatably embedded with a ball 18. The inner wall of the slope section 24 is provided with an avoidance hole 19. The aperture of the avoidance hole 19 matches the outer diameter of the short shaft 14. In addition, the opening position of the avoidance hole 19 corresponds to the position of the short shaft 14 after the four molding cavity combination blocks 7 are close together and abutted against each other, or the avoidance hole 19 is in a coaxial state with the short shaft 14 at this time. The peripheral sleeve of the guide shaft 16 is wrapped with a return spring 20, and the two ends of the return spring 20 in the elastic force direction elastically abut against the outer wall of the movable block 15 and the inner wall of the sliding groove 17 respectively;

[0047] A lifting column 3 is vertically penetrated through the top of the fixed seat 8, and a spline hole is provided on the top surface of the fixed seat 8 for the lifting column 3 to pass freely. The lifting column 3 and the hole wall of the spline hole constitute a spline connection, and a rotating sleeve 21 is rotatably connected in the fixed seat 8. Specifically, a bearing is embedded in the bottom of the fixed seat 8, and the lower end of the rotating sleeve 21 is inserted in the inner ring of the bearing. In addition, an air avoidance groove is provided inside the fixed seat 8 for the rotating sleeve 21 to pass freely, and a sliding hole is coaxially provided on the rotating sleeve 21 for the lifting column 3 to pass freely. A movable steel ball 29 is rotatably embedded in the periphery of the lower side of the lifting column 3, and a spiral rolling groove 25 for the movable steel ball 29 to engage is provided on the hole wall of the sliding hole. The ball 29 rolls freely in the spiral rolling groove 25. A driving rod 28 is horizontally fixed to the outer wall of one side of the movable block 15. The driving rod 28 slides freely horizontally in the fixed seat 8. A rack section 26 is provided on the outer wall of one side of the driving rod 28 adjacent to the rotating sleeve 21. A gear section 22 meshing with the rack section 26 is provided on the periphery of the rotating sleeve 21. When the upper mold base 5 and the lower mold base 9 are in mold closing, the lower mold base 9 will move toward the upper mold base 5, so that the ball 18 at the end of the short shaft 14 contacts the inclined surface of the ramp section 24 in the accommodating cavity 23, and then the ball 18 rolls on the inclined surface, generating a horizontal force on the short shaft 14. Driven by the horizontal force, the short shaft 1 4 will drive the movable block 15 and the molding cavity assembly block 7 to move toward the inner side of the center line of the fixed seat 8, so that the movable block 15 can drive the driving rod 28 to move toward the direction of the rotating sleeve 21, so that the gear segment 22 on the periphery of the rotating sleeve 21 is meshed with the rack segment 26 on the driving rod 28, so that the rotating sleeve 21 can be driven to rotate. When the rotating sleeve 21 rotates, the movable steel ball 29 will roll in the spiral rolling groove 25. Since the lifting column 3 and the sliding hole are splined, the rotating sleeve 21 drives the lifting column 3 to move downward when rotating, until the short shaft 14 is inserted into the avoidance hole 19, and the top surface of the lifting column 3 is aligned with the fixed seat 8. The top surface is flush with the top surface, and there is no gap between the periphery of the jacking column 3 and the wall of the sliding hole, so that the interior of the forming cavity 27 is in a closed state. After the pressing and molding is completed, the upper die seat 5 and the lower die seat 9 are separated from each other, and the return spring 20 drives the movable block 15 to move in the opposite direction, so that the rack segment 26 on the driving rod 28 and the gear segment 22 on the rotating sleeve 21 are engaged and rotated in the opposite direction, so that the jacking column 3 moves upward. When the jacking column 3 moves upward, it can produce a jacking effect on the bottom of the composite material sheet workpiece after the pressing and molding, so that the composite material sheet workpiece is jacked up, so that the staff can unload the composite material sheet workpiece.

[0048] The working principle of this embodiment is as follows:

[0049] The worker places the composite material sheet flat on the top of the four molding cavity assembly blocks 7, and the composite material sheet does not come into contact with the short shaft 14. Then, the electric control cabinet 4 is started, and the oil pump in the oil station 1 is controlled by the electric control cabinet 4 to start. The oil pump starts to supply oil to the jacking cylinder 11, and the jacking cylinder 11 starts to work. Its telescopic rod extends and drives the lower mold base 9 to move upward, thereby causing the lower mold base 9 to move relative to the upper mold base 5, so that the upper mold base 5 and the lower mold base 9 are in a state of starting to close the mold. When the lower mold base 9 moves upward to a fixed position, the end of the short shaft 14 will enter the accommodating cavity 23;

[0050] As the lower die seat 9 continues to move toward the upper die seat 5, the ball 18 at the end of the short shaft 14 contacts the inclined surface of the ramp section 24 in the accommodating cavity 23, and then the ball 18 rolls on the inclined surface, generating a horizontal force on the short shaft 14. Driven by the horizontal force, the short shaft 14 will drive the movable block 15 and the molding cavity assembly block 7 to move toward the inner side of the center line of the fixed seat 8, so that the movable block 15 can drive the driving rod 28 to move toward the direction of the rotating sleeve 21, so that the gear section 22 on the periphery of the rotating sleeve 21 is meshed with the rack section 26 on the driving rod 28, so that the rotating sleeve 21 can be driven to rotate. When the rotating sleeve 21 rotates, the movable steel ball 29 will be moved in the spiral rolling groove 2 5, because the lifting column 3 and the sliding hole are splined, the rotating sleeve 21 drives the lifting column 3 to move downward when rotating, until the short shaft 14 is inserted into the avoidance hole 19, the top surface of the lifting column 3 is flush with the top surface of the fixed seat 8, and there is no gap between the periphery of the lifting column 3 and the hole wall of the sliding hole, so that the inside of the molding cavity 27 is in a closed state, and at this time, the ball 18 rolls from the inclined surface of the ramp section 24 into the avoidance hole 19, and the upper mold base 5 and the lower mold base 9 are still in the process of closing the mold with each other, so the short shaft 14 will be inserted into the avoidance hole 19, so that when the upper mold base 5 and the lower mold base 9 continue to close the mold, the four molding cavity assembly blocks 7 will not continue to move;

[0051] Since the forming cavity assembly block 7 will not continue to move, the lifting column 3 will also be unable to move, so that the top surface of the lifting column 3 remains flush with the top surface of the fixed seat 8. In addition, when the four movable blocks 15 move toward the inner side of the center line of the fixed seat 8, the movable block 15 will produce a compression effect on the return spring 20, so that the return spring 20 is compressed and accumulates elastic potential energy, and then the forming pressure head 12 will contact the surface of the composite material plate workpiece, and then press the composite material plate workpiece to form the composite material plate workpiece in the forming cavity 27. After pressing and forming, the composite material plate workpiece will be stuck in the forming cavity 27, and the inner wall of the forming cavity 27 has a large extrusion force on the surface of the composite material plate workpiece, which cannot be taken manually by workers;

[0052] Therefore, after the pressing and forming is completed, the lower die seat 9 is driven by the lifting cylinder 11 to move downward, so that the upper die seat 5 and the lower die seat 9 are separated from each other. During the separation process, the short shaft 14 will be separated from the avoidance hole 19, and the elastic potential energy of the return spring 20 is released at this time, thereby driving the movable block 15 to move in the opposite direction (outward direction of the center line of the fixed seat 8), thereby making the rack segment 26 on the driving rod 28 and the gear segment 22 on the rotating sleeve 21 mesh and rotate in the opposite direction, so that the movable steel ball 29 rolls in the opposite direction in the spiral rolling groove 25, thereby making the lifting column 3 move upward. When the lifting column 3 moves upward, it can produce a lifting effect on the bottom of the composite material sheet workpiece after the pressing and forming, so that the composite material sheet workpiece is lifted up, so that the staff can unload the composite material sheet workpiece. In the process of moving away from each other, the four forming cavity combination blocks 7 are separated from the contact state with the surface of the composite material sheet workpiece, so that the composite material sheet workpiece can be picked up and unloaded more conveniently, so that the staff can speed up the production rhythm and improve the working efficiency of the hydraulic press.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A single-acting short-stroke composite hydraulic press, comprising an upper die base (5) and a lower die base (9) of the hydraulic press, characterized in that: Also includes: A fixed base (8) connected to the lower die base (9); Four molding cavity assembly blocks (7) are slidably connected to the top surface of the fixing seat (8) in an array along the axial direction of the fixing seat (8), and an arc-shaped groove (13) is formed on the outer wall of one side of the molding cavity assembly block (7); a driving unit provided on the molding cavity assembly block (7), the driving unit being used to drive the molding cavity assembly block (7) to move in the direction of the center line of the lower mold base (9) when the lower mold base (9) moves upward, so that the arc-shaped grooves (13) on the four molding cavity assembly blocks (7) enclose a molding cavity (27), a molding pressure head (12) being fixedly connected to a downward side of the upper mold base (5), and the molding pressure head (12) and the molding cavity (27) are used in conjunction with each other; The driving unit comprises a fixed plate (6) connected to the bottom surface of the upper die seat (5); a movable block (15) is fixedly connected to the outer wall of one side of the molding cavity assembly block (7); a sliding groove (17) for the movable block (15) to engage is provided on the surface of the fixed seat (8); the movable block (15) slides freely in the sliding groove (17); a short shaft (14) is connected to the top of the movable block (15); a receiving cavity (23) corresponding to the short shaft (14) is provided on the downward side of the fixed plate (6); a slope section (24) is provided on the inner wall of the receiving cavity (23); the short shaft (14) cooperates with the slope section (24); and an elastic abutting component for driving the molding cavity assembly block (7) to move toward the outer side of the fixed seat (8) is provided on the fixed seat (8); A lifting column (3) is vertically penetrated through the top of the fixed seat (8); a spline hole is opened on the top surface of the fixed seat (8) for the lifting column (3) to freely pass through; the lifting column (3) and the hole wall of the spline hole form a spline connection; a lifting unit is provided in the fixed seat (8); the lifting unit is used to drive the lifting column (3) to move upward when the molding cavity assembly block (7) moves toward the radial outer side of the fixed seat (8), so that the top surface of the lifting column (3) protrudes to the top surface of the fixed seat (8); The lifting unit comprises a rotating sleeve (21) rotatably connected to the fixed seat (8), a sliding hole coaxially provided on the rotating sleeve (21) for the lifting column (3) to freely pass through, a movable steel ball (29) rotatably embedded in the periphery of the lower side of the lifting column (3), a spiral rolling groove (25) provided on the wall of the sliding hole for the movable steel ball (29) to engage, the movable steel ball (29) freely rolling in the spiral rolling groove (25), a driving rod (28) horizontally fixedly connected to the outer wall of one side of the movable block (15), the driving rod (28) freely sliding horizontally in the fixed seat (8), a rack section (26) provided on the outer wall of one side of the driving rod (28) adjacent to the rotating sleeve (21), and a gear section (22) meshing with the rack section (26) provided on the periphery of the rotating sleeve (21).

2. The single-acting short-stroke composite hydraulic press according to claim 1, characterized in that: The hydraulic press further comprises a lifting cylinder (11), the upper end of which is fixedly connected to a lifting seat (10), the upper die seat (5) being connected above the lifting seat (10) via a plurality of columns (2), and the lower die seat (9) being connected to the output end of the lifting cylinder (11).

3. The single-acting short-stroke composite hydraulic press according to claim 2, characterized in that: The hydraulic press further comprises an oil station (1) mounted on the outside of the lifting cylinder (11), and the oil station (1) is used in conjunction with the lifting cylinder (11).

4. The single-acting short-stroke composite hydraulic press according to claim 3, characterized in that: The hydraulic press further comprises an electric control cabinet (4), wherein the electric control cabinet (4) is used to control the start and stop of the oil station (1).

5. The single-acting short-stroke composite hydraulic press according to claim 1, characterized in that: A ball (18) is rotatably embedded at the top end of the short shaft (14).

6. The single-acting short-stroke composite hydraulic press according to claim 1, characterized in that: An avoidance hole (19) is provided on the inner wall of the slope section (24), and the diameter of the avoidance hole (19) matches the outer diameter of the short shaft (14).

7. The single-acting short-stroke composite hydraulic press according to claim 1, characterized in that: The elastic abutment assembly comprises a guide shaft (16) horizontally penetrated through the outer wall of the fixed seat (8); the outer wall of the movable block (15) is provided with a guide hole for the guide shaft (16) to freely pass through; a return spring (20) is sleeved around the periphery of the guide shaft (16); and the two ends of the return spring (20) in the elastic force direction elastically abut the outer wall of the movable block (15) and the inner wall of the sliding groove (17) respectively.

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