Environment-friendly high-precision electric pressurizing oil cylinder

Abstract

An environment-friendly high-precision electric pressurizing oil cylinder comprises an electric cylinder body, an oil cylinder and a hydraulic cylinder, the hydraulic cylinder is fixedly installed at the bottom of the electric cylinder body, the oil cylinder is fixedly installed on one side of the hydraulic cylinder, the hydraulic cylinder comprises a cylinder body, a piston body and a piston rod, and the piston body is slidably installed in the cylinder body; the piston body divides the cylinder body into an upper cavity and a lower cavity which are not communicated with each other, an oil inlet communicated with the upper cavity is formed in the cylinder body, the piston rod is fixedly installed at the bottom end of the piston body, the oil cylinder comprises a shell, a one-way valve and an electromagnetic valve, an oil return opening is formed in the top end of the shell, and an oil outlet is formed in the bottom of the shell. An electromagnetic valve is fixedly installed in the oil return opening, and a one-way valve is fixedly installed in the oil outlet. Due to the arrangement of the hydraulic cylinder and the oil cylinder, the hydraulic cylinder can provide larger pressure relative to the air cylinder, the positioning precision is higher, the oil cylinder replaces a large hydraulic station system to control the hydraulic cylinder, and the characteristics of high bearing capacity, high precision, long service life and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the field of electric cylinders, in particular to an environmentally friendly high-precision electric booster oil cylinder. Background Art

[0002] Macro-pressure cylinder is also known as electro-hydraulic booster cylinder, electro-hydraulic cylinder, hydraulic-electric booster cylinder, hydraulic-electric cylinder, gas-electro-hydraulic booster cylinder, gas-electro-hydraulic cylinder, etc. Macro-pressure cylinder is used in occasions where high pressure and positioning accuracy are required. Since air cylinders cannot provide high pressure and positioning accuracy, although hydraulic cylinders can provide high pressure and accuracy, they need hydraulic stations to provide control. High-pressure hydraulic cylinders require large hydraulic station systems, which are costly, complex to control, difficult to maintain, and easy to pollute the environment. Utility Model Content

[0003] The purpose of the utility model is to provide an environmentally friendly high-precision electric booster cylinder to solve the problems existing in the above-mentioned prior art.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] An environmentally friendly high-precision electric booster oil cylinder comprises an electric cylinder body, an oil cylinder and a hydraulic cylinder, wherein the hydraulic cylinder is fixedly mounted on the bottom of the electric cylinder body, and the oil cylinder is fixedly mounted on one side of the hydraulic cylinder;

[0006] The hydraulic cylinder comprises a cylinder body, a piston body and a piston rod. The piston body is slidably mounted inside the cylinder body, and the piston body divides the cylinder body into an upper chamber and a lower chamber which are not connected to each other. The cylinder body is provided with an oil inlet which is connected to the upper chamber. The piston rod is fixedly mounted at the bottom end of the piston body. The lower telescopic rod of the electric cylinder body passes through the top of the cylinder body and is fixedly connected to the piston body inside the cylinder body.

[0007] The oil cylinder includes a shell, a one-way valve and a solenoid valve. The top of the shell is provided with an oil return port, the bottom of the shell is provided with an oil outlet, the interior of the oil return port is fixedly installed with a solenoid valve, the interior of the oil outlet is fixedly installed with a one-way valve, the one-way valve is connected to one end of an oil outlet pipe, the other end of the oil outlet pipe is connected to the oil inlet of the cylinder body, the solenoid valve is connected to one end of a return pipe, the other end of the return pipe is connected to the oil outlet of the shell.

[0008] By adopting the above technical scheme, the electric cylinder is used to improve the overall accuracy of the electric booster cylinder, and the oil cylinder and hydraulic cylinder fixedly installed on the electric cylinder are used to increase the pressure to increase the load-bearing capacity. It can also be lower in cost than a large hydraulic cylinder that requires a large hydraulic station. It is also easy to maintain and control, and the environmental pollution generated is also small. The hydraulic cylinder itself also has the advantages of low noise and long life. The cylinder body is divided into an upper chamber and a lower chamber by the piston body. The top and bottom ends of the piston body are both provided with sealing rings to increase the sealing of the hydraulic cylinder and prevent hydraulic oil leakage. At the same time, hydraulic oil is injected into the upper chamber through the oil outlet pipe to play a pressurizing role. The one-way valve can prevent the hydraulic oil from flowing back from the upper chamber into the cylinder, thereby maintaining the rated stroke, allowing the electric cylinder to withstand a higher load than before, and the impact resistance is also improved.

[0009] In a further embodiment, the electric cylinder body includes an outer shell, a sleeve, a screw rod, a box and a driving device, a outer shell is provided on the left side of the bottom end of the box, a driving device is provided on the right side of the bottom end of the box, a rotating shaft is provided on the top of the driving device, a telescopic hole is provided at the middle position of the bottom of the outer shell, a screw rod is passed through the telescopic hole, the axis of the screw rod is vertically arranged, the screw rod is threadedly connected with the sleeve, the sleeve is arranged at the bottom end of the screw rod, the rotating shaft and the top end of the screw rod are both arranged inside the box, a driving wheel is sleeved on the top of the rotating shaft, a driven wheel is sleeved on the top of the screw rod, a transmission belt is sleeved on the driving wheel and the driven wheel, and the screw rod and the driving device are connected through the transmission belt.

[0010] By adopting the above technical solution, a servo motor is selected for the driving device. The servo motor can complete very small adjustments with high precision. Through the linkage of the servo motor and the hydraulic cylinder, the processing accuracy can be effectively improved to meet higher processing requirements. In addition to this folding electric cylinder, a linear electric cylinder can also be used as needed, and the hydraulic cylinder can be precisely controlled.

[0011] In a further embodiment, a receiving groove is provided on the top of the piston body, a threaded hole is provided in the middle position of the receiving groove, the sleeve is bolted and fixed to the piston body, a sealing groove is provided on the side wall of the receiving groove, a sealing ring is fixedly installed in the sealing groove, and the sealing ring is used to prevent leakage of hydraulic oil.

[0012] By adopting the above technical scheme, the sleeve is fixedly connected to the piston body, and a special sealing groove is provided at the connection point, and an O-shaped sealing ring is used for extrusion sealing. The extrusion seal is installed in the groove and is pre-extruded by the sealing ring to generate a clamping force. When working, the sealing ring is squeezed by the medium pressure to generate a clamping force, thereby closing the sealing gap and achieving the purpose of sealing. This sealing method has a compact structure, occupies a small space, has small dynamic friction resistance, is easy to disassemble and has low cost.

[0013] In a further embodiment, a fixing plate is bolted to the bottom of the hydraulic cylinder, a through hole is provided at one end of the fixing plate for the piston rod to pass through, and an oil cylinder is bolted to the other end of the top of the fixing plate.

[0014] By adopting the above technical solution, the hydraulic cylinder and the oil cylinder are both bolted to the fixed plate, which can ensure that the two are tightly connected, and no deviation will occur during the hydraulic oil delivery process. The possibility of damage to the oil inlet pipe and the return pipe is also reduced. At the same time, it is more convenient to disassemble and repair the hydraulic cylinder or the oil cylinder, which effectively increases the service life of the device.

[0015] In a further embodiment, a displacement sensor 4 is fixedly installed inside the piston rod 33 , and the displacement sensor 4 is coaxially arranged with the piston rod 33 .

[0016] By adopting the above technical solution, the magnetostrictive displacement sensor can accurately measure the movement of the piston rod in the hydraulic cylinder. The installation groove is set inside the piston rod to reduce the space usage of the displacement sensor in the hydraulic cylinder. The core principle of the magnetostrictive displacement sensor is that the waveguide moves in the magnetic field and sends out an electrical signal to determine the displacement. Although this type of sensor can achieve higher accuracy, the longer its detection length, the greater the error, and it is necessary to select a more suitable type according to the stroke of the hydraulic cylinder.

[0017] In a further embodiment, a sealing gasket 5 is fixedly installed at the telescopic hole.

[0018] By adopting the above technical solution, since the electric cylinder and the hydraulic cylinder are fixedly connected, it is also necessary to prevent the hydraulic oil from flowing into the inner shell of the electric cylinder along the bottom of the electric cylinder, so a sealing gasket needs to be installed, and the sealing gasket also has a buffering effect.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. Through the setting of hydraulic cylinders and oil cylinders, a small hydraulic cylinder can replace a large hydraulic station, and can provide high pressure and precision even without hydraulic station control. Since a large-pressure hydraulic cylinder requires a large hydraulic station system, a small hydraulic cylinder supplied with hydraulic oil through an oil cylinder has the advantages of low cost, simple control, easy maintenance and environmental protection, and provides a greater pressure and positioning accuracy than a cylinder;

[0021] 2. Through the setting of the displacement sensor, the stroke of the hydraulic cylinder can be effectively measured. The displacement sensor is set in the space inside the piston rod, and multiple magnetic rings are also set in the hydraulic cylinder to facilitate non-contact measurement. The displacement sensor can effectively realize the digitization of the hydraulic cylinder, and also has the advantages of high measurement accuracy, strong anti-interference ability and oil resistance and anti-fouling. At the same time, the non-contact measurement method also greatly extends the service life of the displacement sensor, reduces the frequency of maintenance and overhaul, and effectively cooperates with the servo hydraulic cylinder to improve the positioning accuracy;

[0022] 3. Through the setting of the electric cylinder body, the rising accuracy of the sleeve on the screw can be improved through the cooperation of the servo motor and the planetary roller screw. Since the sleeve is fixedly connected to the piston body, when the piston body moves, it will also be affected by the servo motor, thereby increasing the accuracy of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of an environmentally friendly high-precision electric booster cylinder of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of a hydraulic cylinder and an oil cylinder in an environmentally friendly high-precision electric booster oil cylinder of the utility model;

[0025] Figure 3 It is a schematic diagram of the internal structure of an electric cylinder body in an environmentally friendly high-precision electric booster cylinder of the utility model.

[0026] In the figure, 1. electric cylinder body; 11. outer shell; 12. sleeve; 13. screw rod; 14. box body; 15. driving device; 2. oil cylinder; 21. shell; 22. one-way valve; 23. solenoid valve; 3. hydraulic cylinder; 31. cylinder body; 32. piston body; 33. piston rod; 4. displacement sensor; 5. sealing gasket; 6. fixing plate. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the attached Figure 1In the description of this specification, the words "bottom" and "top", "inside" and "outside" refer to directions toward or away from a particular component geometry, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this specification, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] Example:

[0030] like Figure 1-2 As shown, an environmentally friendly high-precision electric booster oil cylinder comprises an electric cylinder body 1, an oil cylinder 2 and a hydraulic cylinder 3. The hydraulic cylinder 3 is fixedly mounted on the bottom of the electric cylinder body 1, and the oil cylinder 2 is fixedly mounted on one side of the hydraulic cylinder 3. A fixing plate 6 is bolted to the bottom of the hydraulic cylinder 3. A through hole is provided at one end of the fixing plate 6, and the oil cylinder 2 is bolted to the other end of the top of the fixing plate 6. The hydraulic cylinder 3 comprises a cylinder body 31, a piston body 32 and a piston rod 33. The piston body 32 is slidably mounted inside the cylinder body 31, and is movable. The plug body 32 divides the cylinder body 31 into an upper chamber and a lower chamber which are not connected to each other. The cylinder body 31 is provided with an oil inlet which is connected to the upper chamber. The piston rod 33 is fixedly installed at the bottom end of the piston body 32. The through hole is used for the piston rod 33 to pass through. A displacement sensor 4 is fixedly installed inside the piston rod 33. The so-called displacement sensor 4 is coaxially arranged with the piston rod 33. The lower telescopic rod of the electric cylinder body 1 passes through the top of the cylinder body 31 and is fixedly connected to the piston body 32 inside the cylinder body 31. The oil cylinder 2 includes a housing 21, a one-way valve 2 2 and solenoid valve 23, the top of the housing 21 is provided with an oil return port, the bottom of the housing 21 is provided with an oil outlet, the inside of the oil return port is fixedly installed with a solenoid valve 23, the inside of the oil outlet is fixedly installed with a one-way valve 22, the one-way valve 22 is connected with one end of an oil outlet pipe, the other end of the oil outlet pipe is connected with the oil inlet of the cylinder body 31, the solenoid valve 23 is connected with one end of a return pipe, the other end of the return pipe is connected with the oil outlet of the housing 21, when the telescopic rod on the electric cylinder body 1 starts to move downward, the one-way valve 22 at the bottom of the oil cylinder 2 The oil starts to flow out, and the hydraulic oil flows into the upper chamber of the hydraulic cylinder 3 along the oil outlet pipe, and pushes the piston body 32 and the piston rod 33 downward. In this process, the load-bearing capacity of the original electric cylinder can be improved, the pressure-increasing effect can be achieved, and the pressure and precision can be increased to a greater extent than that of the air cylinder. When the telescopic rod needs to be retracted, the solenoid valve 23 will open, and the hydraulic oil will flow back into the oil cylinder 2 along the return pipe. Regardless of whether the telescopic rod is extended or retracted, the displacement sensor 4 arranged inside the threaded rod will detect the stroke to determine its movement stroke.

[0031] like Figure 1-3As shown, the electric cylinder body 1 includes a shell 11, a sleeve 12, a screw 13, a box 14 and a driving device 15. The shell 11 is arranged on the left side of the bottom end of the box 14, and the driving device 15 is arranged on the right side of the bottom end of the box 14. A rotating shaft is arranged on the top of the driving device 15. A telescopic hole is arranged in the middle position of the bottom of the shell 11, and a screw 13 is passed through the telescopic hole. A sealing gasket 5 is fixedly installed at the telescopic hole. The axis of the screw 13 is arranged vertically, and the screw 13 is threadedly connected with the sleeve 12. The sleeve 12 is arranged at the bottom end of the screw 13. The top of the rotating shaft and the screw 13 are both arranged inside the box 14. A driving wheel is sleeved on the top of the rotating shaft, and a driven wheel is sleeved on the top of the screw 13. A transmission belt is sleeved on both the driving wheel and the driven wheel, and the screw rod 13 and the driving device 15 are connected through the transmission belt. The driving device 15 is mainly a servo motor. The servo motor can cooperate with the one-way valve 22 and the solenoid valve 23 in the oil cylinder 2 to improve the reaction speed and execution efficiency of the lifting and lowering of the piston body 32 in the hydraulic cylinder 3. The screw rod 13 is a planetary roller screw rod 13. The sealing gasket 5 on the telescopic rod at the bottom of the housing 11 can effectively prevent oil leakage and dust from entering the servo electric cylinder. The planetary roller screw rod 13 can improve the accuracy of the servo electric cylinder, and will not have the same noise and other problems as the planetary roller screw rod 13. It is more accurate and convenient, and has a longer service life.

[0032] Specific implementation process: First, the electric cylinder body 1 needs to be installed on a flat plane. The electric cylinder body 1 and the hydraulic cylinder 3 and the oil cylinder 2 are integrated together, occupying a very small area and do not require an additional large hydraulic station for pressure control and support. The interior of the oil cylinder 2 itself stores hydraulic oil, and the hydraulic oil can enter the upper chamber of the hydraulic cylinder 3 through the one-way valve 22 at the bottom of the oil cylinder 2. When the hydraulic cylinder 3 is pushing certain heavy objects, the hydraulic oil cannot flow back through the one-way valve 22, so the heavy objects can be kept at a certain height. At the same time, the pressure and maintainability of the hydraulic cylinder 3 of this volume are higher than those of the air cylinder. The driving device 15 in the motor body, that is, the servo motor can drive the screw 13 to rotate, and the sleeve 12 is also threadedly connected to the outside of the planetary roller screw, and an anti-rotation mechanism is provided on the sleeve 12, so it will rotate with the screw 13. The piston rod 33 is rotated and rises, and when it needs to descend, the servo motor flips, and the sleeve 12 fixed to the piston body 32 also begins to descend, pulling the piston body 32 down together. During this process, the solenoid valve 23 will open, and the hydraulic oil will be refilled in the oil cylinder 2 through the return pipe. The heavy object is also pressurized by the hydraulic cylinder 3, thereby achieving the downward pressure or lifting of the heavy object. A sealing gasket 5 is also provided at the telescopic hole at the top of the sleeve 12 of the electric cylinder body 1, which can prevent hydraulic oil or dust from accidentally entering the electric cylinder. The top and bottom of the piston body 32 are also covered with sealing rings. In addition, there is an installation space inside the piston rod 33 for installing the displacement sensor 4. The displacement sensor 4 and the magnetic ring perform non-contact measurement, which can accurately and effectively control the stroke of the hydraulic cylinder 3 without affecting its service life and reducing the maintenance frequency.

[0033] In the embodiments disclosed in the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0034] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An environmentally friendly high-precision electric booster cylinder, comprising an electric cylinder body (1), an oil cylinder (2) and a hydraulic cylinder (3), characterized in that: The hydraulic cylinder (3) is fixedly mounted on the bottom of the electric cylinder body (1), and the oil cylinder (2) is fixedly mounted on one side of the hydraulic cylinder (3); The hydraulic cylinder (3) comprises a cylinder body (31), a piston body (32) and a piston rod (33); the piston body (32) is slidably mounted inside the cylinder body (31), and the piston body (32) divides the cylinder body (31) into an upper chamber and a lower chamber that are not connected to each other; the cylinder body (31) is provided with an oil inlet that is connected to the upper chamber; the piston rod (33) is fixedly mounted on the bottom end of the piston body (32); and the lower telescopic rod of the electric cylinder body (1) passes through the top of the cylinder body (31) and is fixedly connected to the piston body (32) inside the cylinder body (31); The oil cylinder (2) comprises a shell (21), a one-way valve (22) and a solenoid valve (23); the top of the shell (21) is provided with an oil return port, the bottom of the shell (21) is provided with an oil outlet, the interior of the oil return port is fixedly provided with a solenoid valve (23), the interior of the oil outlet is fixedly provided with a one-way valve (22), the one-way valve (22) is connected to one end of an oil outlet pipe, the other end of the oil outlet pipe is connected to an oil inlet of the cylinder body (31), the solenoid valve (23) is connected to one end of a return pipe, the other end of the return pipe is connected to the oil outlet of the shell (21).

2. The environmentally friendly high-precision electric booster cylinder according to claim 1 is characterized by: The electric cylinder body (1) comprises a housing (11), a sleeve (12), a screw rod (13), a box (14) and a driving device (15); the housing (11) is arranged on the left side of the bottom end of the box (14); the driving device (15) is arranged on the right side of the bottom end of the box (14); a rotating shaft is arranged on the top of the driving device (15); a telescopic hole is arranged in the middle of the bottom of the housing (11); a screw rod (13) is inserted into the telescopic hole; the screw rod (13) is arranged on the top of the driving device (15); 3) The axis is arranged vertically, the screw rod (13) is threadedly connected to the sleeve (12), the sleeve (12) is arranged at the bottom end of the screw rod (13), the top ends of the rotating shaft and the screw rod (13) are arranged inside the box (14), the top of the rotating shaft is provided with a driving wheel, the top of the screw rod (13) is provided with a driven wheel, the driving wheel and the driven wheel are both provided with a transmission belt, and the screw rod (13) and the driving device (15) are connected by the transmission belt.

3. The environmentally friendly high-precision electric booster cylinder according to claim 2 is characterized by: The top of the piston body (32) is provided with a receiving groove, the middle position of the receiving groove is provided with a threaded hole, the sleeve (12) is bolted and fixed to the piston body (32), the side wall of the receiving groove is provided with a sealing groove, a sealing ring is fixedly installed in the sealing groove, and the sealing ring is used to prevent leakage of hydraulic oil.

4. The environmentally friendly high-precision electric booster cylinder according to claim 1 is characterized by: A fixing plate (6) is bolted to the bottom of the hydraulic cylinder (3), one end of the fixing plate (6) is provided with a through hole for allowing the piston rod (33) to pass through, and the other end of the top of the fixing plate (6) is bolted to the oil cylinder (2).

5. The environmentally friendly high-precision electric booster cylinder according to claim 1 is characterized by: A displacement sensor (4) is fixedly installed inside the piston rod (33), and the displacement sensor (4) is coaxially arranged with the piston rod (33).

6. The environmentally friendly high-precision electric booster cylinder according to claim 2 is characterized by: A sealing gasket (5) is fixedly installed at the telescopic hole.

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