Electro-hydraulic hybrid servo hydraulic cylinder

Abstract

The invention relates to an electro-hydraulic hybrid servo hydraulic cylinder, in particular to a servo hydraulic cylinder in which a servo motor is linked with a ball screw to output speed and position and fluid pressure to output acting force, and the servo motor rotates at a high speed to drive the ball screw to rotate so as to drive a piston rod of an oil cylinder to quickly run; under the action of high pressure of fluid, the oil cylinder outputs larger acting force, so that accurate positioning, quick transmission and large acting force of the large-tonnage hydraulic cylinder are realized; the oil cylinder runs quickly, and oil is supplemented through the prefill valve; the piston rod moves downwards, the external gas source absorbs redundant gas exhausted by the oil cylinder, and at the moment, the pressure in the external gas source is increased; when the piston rod of the oil cylinder retracts, the external air source releases pressure.

Description

Technical Field:

[0001] The present invention belongs to the technical field of transmission, and specifically relates to an electro-hydraulic hybrid servo hydraulic cylinder, which is a servo hydraulic cylinder that uses a servo motor to drive a ball screw to perform a linear motion and outputs a force with fluid pressure. Background Art:

[0002] In the field of forging manufacturing, a blank is plastically deformed by applying a force through a hammer head to form a shape and size. In the manufacturing process, in order to improve production efficiency and accelerate the forging rhythm, the common practice is to increase the operating speed and forging output force of the actuators in the forging equipment; currently, the most commonly used method is to add a quick cylinder in the actuating hydraulic cylinder to increase the operating speed of the actuator. The quick cylinder refers to adding a hydraulic cylinder cavity with a small volume in the middle of the hydraulic cylinder to make it run quickly; a fluid filling valve is provided on the large hydraulic cylinder to meet the requirements of quick operation and output a large force; however, due to the limitations of the pump displacement and hydraulic transmission efficiency in the hydraulic transmission process, it cannot be broken through, and the operating speed and control accuracy can only be within a relatively limited range. Summary of the Invention:

[0003] The present technology is an electro-hydraulic hybrid servo hydraulic cylinder, which is a servo hydraulic cylinder that uses a servo motor to drive a ball screw to output speed and outputs a force with fluid pressure. It is a servo hydraulic cylinder with precise positioning, fast transmission, and large force output.

[0004] To achieve the above object, an electro-hydraulic hybrid servo hydraulic cylinder of the present technology includes a servo motor, a motor flange, a guide rod, a filling valve, a guide rod flange, bolts, a cylinder bottom, a cylinder barrel, a flange, a large oil port, a small oil port, a proximity switch, screws, a piston rod, a coupling, nuts, a spacer sleeve, a compression sleeve, bearings, a bearing sleeve, a V-shaped seal, a nut flange, a transmission nut, a ball screw, a small bearing, a gland, a rotating sleeve, a guide sleeve, a piston, a rod body, a rod end, a rod end screw, and a fixing bolt. The characteristics are as follows: The servo motor is connected to the ball screw through a coupling. A transmission nut is provided on the ball screw. The transmission nut is fixed to the piston through screws. The rotation of the servo motor drives the rotation of the ball screw. The transmission nut drives the piston rod to move rapidly in a straight line. The ball screw is located at the center of the piston rod. The outside of the piston rod is the cylinder barrel. The two ends of the cylinder barrel are a guide sleeve and a cylinder bottom respectively. A filling valve is provided on the cylinder bottom. The cylinder barrel and the flange are welded together. A large oil port, a small oil port, and a proximity switch are provided on the outer diameter of the cylinder barrel. The servo motor is fixed to the motor flange through screws. There are multiple guide rods on the motor flange. The motor flange is screwed together with the bearing sleeve through threads. The bearing sleeve is provided with a coupling, nuts, a spacer sleeve, and bearings. The coupling connects the servo motor and the ball screw together. There are 24 guide rods. One end of each guide rod is screwed to the motor flange through threads, and the other end is inserted into the cylinder bottom. A guide rod flange is screwed on the end face of the cylinder bottom. The guide rod flange is sleeved on the guide rod. A V-shaped seal is provided between the guide rod flange and the cylinder bottom. The bearing rotates on the end of the ball screw. A small bearing is provided between the rotating sleeve and the ball screw. The end face is a gland. The fixing bolt passes through the gland and is connected to the ball screw. The rotating sleeve rotates with the rotation of the ball screw. The piston rod is composed of a piston, a rod body, and a rod end. Among them, the piston is welded to the rod body, and the rod end is screwed to the rod body through a rod end screw. The piston rod is inside the cylinder barrel. Multiple seals are provided on the piston. The guide sleeves and the cylinder bottom at both ends of the cylinder barrel are screwed to the cylinder barrel through bolts. Seals are provided on the positioning shafts where the guide sleeves, the cylinder bottom, and the cylinder barrel are in contact. Proximity switches are provided at both ends of the cylinder barrel. The proximity switches are inserted into the cylinder barrel through internal threads, and the end faces of the proximity switches are in contact with the edge of the piston.

[0005] Compared with the prior art, the beneficial effects of an electro-hydraulic hybrid servo hydraulic cylinder of the present technology are as follows: It is a servo hydraulic cylinder in which the servo motor drives the ball screw to output speed and the fluid pressure outputs the acting force. Among them, the servo motor rotates at a high speed, driving the ball screw and the piston rod to run at a high speed. The filling valve can quickly replenish the oil in the oil cylinder to meet the oil quantity requirement for the high-speed operation of the piston rod. When pressurizing, the high pressure of the fluid is input through the large oil port of the cylinder barrel, and the piston rod outputs a large acting force. Under the action of the servo motor, the piston rod is accurately positioned, quickly transmitted, and outputs a large acting force. Description of the Drawings

[0006] Figure 1Schematic diagram of the overall effect of an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology; Figure 2 Schematic sectional structure diagram of an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology; Figure 3 Schematic installation diagram of the cylinder bottom of an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology; Figure 4 Schematic installation diagram of the motor and ball screw of an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology; Figure 5 Schematic structure diagram of the piston rod of an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology; In the figure: servo motor 1, motor flange 2, guide rod 3, filling valve 4, guide rod flange 5, bolt 6, cylinder bottom 7, cylinder barrel 8, flange 9, large oil port 10, small oil port 11, proximity switch 12, screw 13, piston rod 14, coupling 15, nut 16, spacer sleeve 17, compression sleeve 18, bearing 19, bearing sleeve 20, V-shaped seal 21, nut flange 22, transmission nut 23, ball screw 24, small bearing 25, gland 26, rotating sleeve 27, guide sleeve 28, piston 29, rod body 30, rod end 31, rod end screw 32, fixing bolt 33. Specific implementation method

[0007] The following further details an electro-hydraulic hybrid servo hydraulic cylinder according to the present technology in conjunction with the attached drawings and examples. As shown in the figure, an electro-hydraulic hybrid servo hydraulic cylinder has the following operating steps: Step 1, connect the small oil port 11 to an external air source, set the initial pressure value, and make the piston rod 14 in the fully retracted state; Step 2, start the servo motor 1, the servo motor 1 rotates at high speed, rotates the ball screw 24 through the coupling 15, and makes the piston rod 14 run quickly; the servo motor 1 makes the piston rod 14 accurately reach the specified position; the filling valve 4 at the end of the cylinder bottom 7 supplies oil to the quickly running servo hydraulic cylinder; Step 3, when the piston rod 14 reaches the set position point, stop the rotation of the servo motor 1, input high pressure of fluid pressure to the servo hydraulic cylinder through the large oil port 10, and the piston rod 14 outputs a large acting force under the action of the fluid pressure; at this time, the bearing sleeve 20, ball screw 24, servo motor 1, and guide rod 3 as a whole generate a small displacement along with the piston rod 14; at this time, the external air source of the small oil port 11 absorbs the excess gas discharged from the servo hydraulic cylinder, and the pressure inside the external air source increases; Step 4, unload the large oil port 10 of the servo hydraulic cylinder, release the pressure of the external air source, the piston rod 14 of the hydraulic cylinder retracts reversely to the set position point, start the servo motor 1, and the servo motor 1 drives the piston rod 14 to quickly retract.

[0008] An electro-hydraulic hybrid servo hydraulic cylinder of the present technology, its structure is characterized in that: the transmission nut 23 on the ball screw 24 is connected to the piston 29 by bolts. Outside the transmission nut 23 is the nut flange 22, and the nut flange 22 is screwed onto the piston 29; at the end of the ball screw 24 is provided with a rotating sleeve 27. Between the rotating sleeve 27 and the ball screw 24 is provided with a small bearing 25, and the end face is the gland 26. The fixing bolt 33 passes through the gland 26 and is connected to the ball screw 24; the rotating sleeve 27 is inside the piston rod 14. The piston rod 14 is composed of a piston 29, a rod body 30, and a rod end 31. Among them, the piston 29 is welded to the rod body 30, and the rod end 31 is screwed to the rod body 30 by a rod end screw 32; the piston rod 14 is inside the cylinder barrel 8. On the piston 29 are provided multiple seals. The guide sleeve 28 at one end of the cylinder barrel 8 is bolted by bolts 6, and the cylinder bottom 7 at the other end is screwed to the cylinder barrel 8 by screws 13. And on the contact positioning shafts of the guide sleeve 28, the cylinder bottom 7 and the cylinder barrel 8 are provided with seals; at both ends of the cylinder barrel 8 are provided proximity switches 12. The proximity switches 12 are inserted into the cylinder barrel 8 through internal threads, and the end faces of the proximity switches 12 are in contact with the edge of the piston 29; on the outer diameter of the cylinder barrel 8 are simultaneously welded a large oil port 10 and a small oil port 11; the cylinder barrel 8 is welded to the flange 9, and the flange 9 is used for the installation of the hydraulic cylinder; the bearing sleeve 20 passes through the cylinder bottom 7 and is screwed together with the motor flange 2 by threads; the servo motor 1 is fixed on the motor flange 2 by screws; inside the bearing sleeve 20 are provided a coupling 15, a nut 16, a spacer sleeve 17, a compression sleeve 18, and a bearing 19. The coupling 15 connects the servo motor 1 and the ball screw 24 together; there are 24 guide rods 3. One end of the guide rod 3 is screwed to the motor flange 2 by threads, and the other end is inserted into the cylinder bottom 7; on the end face of the cylinder bottom 7 is screwed a guide rod flange 5. The guide rod flange 5 is sleeved on the guide rod 3, and a V-shaped seal 21 is provided between the guide rod flange 5 and the cylinder bottom 7; on the cylinder bottom 7 is provided a filling valve 4.

Claims

1. An electro-hydraulic hybrid servo hydraulic cylinder is a servo hydraulic cylinder that outputs speed through a servo motor linked to a ball screw and outputs force through fluid pressure. It includes a servo motor, a motor flange, a guide rod, a filling valve, a guide rod flange, bolts, a cylinder bottom, a cylinder barrel, a flange, a large oil port, a small oil port, a proximity switch, screws, a piston rod, a coupling, nuts, a spacer sleeve, a compression sleeve, bearings, bearing sleeves, V-shaped seals, nut flanges, transmission nuts, ball screws, small bearings, gland covers, rotating sleeves, guide sleeves, pistons, rod bodies, rod ends, rod end screws, fixed bolts. Its characteristics are that, The servo motor is connected to the ball screw through a coupling; a transmission nut is provided on the ball screw, and the transmission nut is fixed to the piston by screws; the ball screw is located at the core of the piston rod; outside the piston rod is the cylinder barrel, and both ends of the cylinder barrel are respectively a guide sleeve and a cylinder bottom; the cylinder barrel and the flange are welded together, and a large oil port, a small oil port and a proximity switch are provided on the outer diameter of the cylinder barrel; at the end of the cylinder bottom are a filling valve and a guide rod.

2. The electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that the servo The motor is fixed to the motor flange by screws; there are multiple guide rods on the motor flange; the motor flange and the bearing sleeve are screwed together by threads; a coupling, a nut, a spacer sleeve, a pressing sleeve and a bearing are provided in the bearing sleeve, and the coupling connects the servo motor to the ball screw.

3. The electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that, There are 24 guide rods. One end of the guide rod is screwed to the motor flange through threads, and the other end is inserted into the cylinder bottom; a guide rod flange is screwed on the end face of the cylinder bottom, and the guide rod flange is sleeved on the guide rod; a V-shaped seal is provided between the guide rod flange and the cylinder bottom.

4. An electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that the bearing The rotating sleeve is at the end of the ball screw. A small bearing is provided between the rotating sleeve and the ball screw. The end face is a gland. The fixing bolt passes through the gland and is connected to the ball screw. The rotating sleeve rotates with the rotation of the ball screw.

5. An electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that, The piston rod is composed of a piston, a rod body and a rod end. Among them, the piston is welded to the rod body, and the rod end is screwed to the rod body by a rod end screw.

6. A electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that The piston rod is inside the cylinder barrel. Multiple seals are provided on the piston. The guide sleeves and the cylinder bottom at both ends of the cylinder barrel are screwed to the cylinder barrel by bolts; seals are provided on the contact positioning shafts of the guide sleeves, the cylinder bottom and the cylinder barrel.

7. A kind of electro-hydraulic hybrid servo hydraulic cylinder according to claim 1, characterized in that, Proximity switches are provided at both ends of the cylinder barrel. The proximity switches are inserted into the cylinder barrel through internal threads; the end faces of the proximity switches are in contact with the edge of the piston.

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