KR20170138601A - Hydraulic servo cylinder unit without servo valve - Google Patents

Abstract

The present invention relates to a hydraulic system which enables a hydraulic cylinder to move forward and backward or rotate through the flow of a fluid, which controls a fluid pump and a fluid motor generating a driving force with low noise and high efficiency to perform servo control without a servo valve. More specifically, the hydraulic cylinder is rotated by a needle roller type rotating body, or is operated with low noise and high driving efficiency with a flow force of a fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic servo cylinder device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pressure servo cylinder and an oil pressure servo apparatus. More particularly, the present invention relates to a hydraulic servo apparatus control system, , And a pump and a motor that can freely adjust the pressure according to the user's need.

The normal and basic hydraulic servo cylinder can change or adjust the speed, pressure and direction of the cylinder according to the user's need by controlling the flow rate by the hydraulic servo valve. However, if the fluid generated in the hydraulic tank passes through the valve, In order to prevent the valve operation from occurring, it is necessary to manage the cleanliness of the fluid through fine management and the fine filter. Also, there is a problem that the control state of the cylinder can be changed by the precision of the valve. The control state is difficult to change. This problem is due to the control characteristic which is determined by the amount of fluid passing through the valve

In order to control the rotation of the hydraulic motor without passing through the servo valve and to achieve the control of the cylinder required by the user, a bidirectional hydraulic pump is employed and a motor for driving the hydraulic pump is controlled by a servo motor Or a stepping motor, and a motion controller can be used to control each other in a closed circuit state. The hydraulic cylinder control device is provided with a positioning means different from all other fluid transfer devices.

Although the above solution is attractive, a pulse control device instead of a conventional servo valve is added. Accordingly, the present invention operates only during a time required for conveying, and the motor can be stopped while the movement is stopped. A pump and a motor which are operated with low noise, low vibration and low friction are desperately required because power loss is minimized.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a hydraulic cylinder that operates at a low noise and high driving efficiency.

Another object of the present invention is to make it possible to use various speed, pressure, position accuracy, and operation conversion based on data fed back by a sensor.

In order to achieve the above object, the present invention provides a control system driven by an upper control device, a motion controller, a pressure sensor, a displacement sensor, a bidirectional hydraulic pump, a servo motor and a motor controller, a hydraulic tank, And controls the flow rate of the hydraulic fluid fed from the hydraulic pump and displays the result using analog information fed back from the sensor, thereby solving the difficulties of the conventional servo cylinder.

As described above, the present invention is a hydraulic cylinder which operates at low noise and high driving efficiency by using the fluid force of the fluid, and is effective for controlling the position, pressure, and speed of the hydraulic cylinder without the servo valve.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is an operational structural view showing a configuration of a control apparatus according to the present invention,
Fig. 1B is a layout diagram of a gear for driving the roller and the rotor in Fig. 1A,
Fig. 2 is a cross-sectional detail view in which three rollers and two rotors are combined and rotated at a ratio of 1: 1,
Fig. 3 is a cross-sectional view of the double pump in which the pump of Fig. 2 is combined with a large-
Fig. 4 is a view showing an embodiment in which three rotors and four rollers are combined
FIG. 5 is a detailed view of the fluid movement state of FIG.
Fig. 6 is a view showing an example in which three rollers and two rotors are rotated at a 1: 3 ratio in the low speed type of Fig. 2

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

As shown in FIGS. 1A, 1B, and 2, the fluid pump of the present invention is configured to be driven by a fluid or generate a driving force, and can be classified according to the ratio of the roller 10 and the rotor 08 And the structure and operation are similar to each other. In the present invention, the roller 10 and the rotor 08 are configured in the form of FIG. 3 in which the pump is applied with the gears 02 and 03 having the ratio of 1: 1 .

The gears 02 and 03 are constituted by the inflow flow spaces 71 and 73 through which the fluid flows and the spaces 72 and 74 through which the fluid flows.

At this time, the roller 10 and the rotor 08 are connected to the gears 02 and 03 and are driven simultaneously. Three or four needles 12 are mounted on the roller 10, The fluid is moved along the flow paths 71 and 72 while being closely contacted with the inner surfaces of the flow paths 71 and 72 and discharged through the discharge holes 75 and 75-1 and 75-2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various changes and modifications may be made by those skilled in the art.

02: Gear (main drive)
03: Gear (for running)
04: Housing
08: Rotor
10: Rollers
12: Needle
71: fluid (inlet)
72: fluid (discharge port)
73: Fluid (inlet)
74: Fluid (discharge port)
75: Exhaust check valve
76: Supply check valve

Claims (5)

In the fluid pump,
The roller 10 and the rotor 08 are connected to the gears 02 and 03 to be simultaneously driven and three or four needles 12 are mounted on the roller 10 to rotate freely, 75-1 and 75-2 while being rotated along the oil passages 71 and 72 in a state of being closely contacted with the oil pressure cylinder 75 and connecting the fluid discharged through the discharge holes 75, 75-1 and 75-2 to the hydraulic cylinder, And the cylinder allows the user to move or rotate the desired speed, pressure, and distance. The fluid pump according to claim 1, wherein the housing (04) and the roller (10), the rotor (08), and the needle (12) rotate in a rolling contact and the rotating shaft (11) Characterized in that the suction and discharge directions are changed by a left-right rotation change, and a hydraulic pressure and a flow rate are controlled by a servo motor as a hydraulic servo cylinder equipped with a pump. 2. The apparatus according to claim 1, wherein the roller (10) and the rotor (08) are rotated by gears (02) and (03) having a ratio of 1: 1 and a large capacity, small capacity roller A fluid pump attachment type servo cylinder device characterized by a multilayer arrangement of the form of Fig. The hydraulic servo cylinder device according to claim 1, characterized by a structure in which the roller (10) and the rotor (08) perform circular rolling friction to reduce noise and vibration. The fluid pump according to claim 1, characterized in that the roller (10) and the rotor (08) are rotated by gears (02), (03) having a 3: 1 ratio, Attached hydraulic servo cylinder device.

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