An electro-hydraulic driven swing mechanism

Abstract

An electro-hydraulic driven swing mechanism, which mainly consists of: a servo motor connected to a bidirectional quantitative pump, the two outlets of the bidirectional quantitative pump are respectively connected to the outlet of a one-way valve, the inlets of the two one-way valves are connected to an oil replenishment accumulator, the bidirectional quantitative pump is respectively connected to the oil holes at both ends of the hydraulic cylinder through a pipeline with a pressure sensor, the hydraulic cylinder is a double-rod structure, and a connecting mechanism with the swing shaft is provided on the hydraulic cylinder, that is, the cylinder barrel of the hydraulic cylinder is connected to an inner ring of a rolling bearing whose axis is perpendicular to the cylinder barrel through a connecting piece, the outer ring of the rolling bearing is placed in the slide groove of the rocker, the other end of the rocker is connected to the swing shaft, and the length of the rocker is determined according to the rotation angle of the swing shaft. The invention has fast response, high swing angle control accuracy, simple structure, and large driving torque, and can meet the requirements of some high-precision special occasions for small size.

Description

Technical Field

[0001] The invention relates to a swing mechanism, in particular to a device integrating an electro-hydraulic drive and a mechanical swing mechanism. Background Art

[0002] The existing swing mechanism mainly realizes clockwise and counterclockwise swing through several methods such as crank rocker mechanism, rotary surface cam mechanism, control of the forward and reverse rotation of the input shaft or gear mechanism. When the crank rocker mechanism is used to convert the rotational motion into swinging, when the rotational motion is a uniform rotation, the swinging speed is uneven, and the movement time in the two directions of the swing is different; when the rotary surface cam mechanism is used to convert the rotation into swinging, the grooves on the rotary surface are difficult to ensure the uniform speed during the swinging and difficult to process; the control part is required to realize the swing by controlling the forward and reverse rotation of the input shaft, and it is usually difficult to realize that the swinging speed of the output shaft is stable and constant; when the gear mechanism is used to realize the swinging, the combined mechanism is more complicated, and the maintenance is relatively difficult and the noise is large.

[0003] The current swing mechanism is generally driven directly by a motor, which results in a small driving torque and a large noise, and it is not possible to achieve a large torque in a small space. When a motor is used for driving, if two or more swing mechanisms are connected in series and there is a phase difference requirement, the motor will be given a back electromotive force, resulting in the positive and negative poles of the power being connected instantly, which is difficult to avoid. Summary of the invention

[0004] The purpose of the present invention is to provide an electro-hydraulic driven swing mechanism with fast response, high precision, simple structure and large driving torque. The present invention is mainly used in high-precision special occasions with precise requirements on swing angle and speed, etc. Through the servo motor and the bidirectional quantitative pump, the hydraulic cylinder is precisely controlled to realize the swing of the mechanical structure. Two accumulators realize oil replenishment and provide additional power, which can adapt to more complex working conditions.

[0005] The present invention mainly includes: a servo motor, a hydraulic pump, a hydraulic oil accumulator, an oil replenishment accumulator, a hydraulic cylinder, a pressure sensor, a displacement sensor, a safety valve, a one-way valve, and a hydraulic cylinder and a swing shaft connection mechanism. Among them, the servo motor is connected to the hydraulic pump, and the hydraulic pump is a bidirectional quantitative pump. The two outlets of the bidirectional quantitative pump are respectively connected to the outlet of a one-way valve, and the inlets of the two one-way valves are connected to the oil replenishment accumulator. The oil replenishment accumulator is equivalent to the oil replenishment pump in a conventional closed system, which is used to replenish oil to the system. Preferably, a hydraulic oil accumulator is provided on each of the two pipelines connecting the two one-way valves and the bidirectional quantitative pump. Preferably, the two working oil ports of the bidirectional quantitative pump are also connected in parallel with the two safety valves respectively. The bidirectional quantitative pump is connected to the oil holes at both ends of the hydraulic cylinder through pipelines with pressure sensors. The hydraulic cylinder is a double-rod structure, the piston rod is fixed, the cylinder barrel moves, the displacement sensor is a cylinder built-in displacement sensor, and the magnetic ring and the non-magnetic gasket are installed on the piston section. The hydraulic cylinder is provided with a connection mechanism with the swing shaft, that is, the cylinder barrel of the hydraulic cylinder is connected to an inner ring of a rolling bearing whose axis is perpendicular to the cylinder barrel through a connecting piece, and the outer ring of the rolling bearing is placed in the slide groove of the rocker, and the other end of the rocker is connected to the swing shaft. The length of the rocker is determined by the rotation angle of the swing shaft. In order to fix the rotation angle of the swing shaft, it is best to set a limit mechanism in the slide groove of the rocker to limit the bearing stroke.

[0006] The working process of the present invention is roughly as follows: the servo motor drives the hydraulic pump, and can adjust its direction and speed. The oil replenishment accumulator cooperates with two one-way valves to replenish oil to the system. The hydraulic cylinder moves under the action of the hydraulic oil output by the hydraulic pump, and drives the rolling bearing connected to it to slide in the slide groove of the rocker, thereby driving the swing arm connected to the rocker to rotate. The pressure sensor and the displacement sensor can monitor basic physical quantities in real time, and feed back the collected signals to the servo motor amplifier to control the flow rate and direction output by the hydraulic pump, thereby controlling the movement and position of the hydraulic cylinder to achieve closed-loop control of position and force. The other two hydraulic oil accumulators of the present invention can provide instantaneous pulsation for the moving cylinder body, realize rapid movement under special working conditions, and stabilize the working pressure. In addition, the safety valve can prevent impact loads from damaging the system.

[0007] Compared with the prior art, the present invention has the following advantages:

[0008] (1) It adopts servo electro-hydraulic drive, which has fast response, high swing angle control accuracy, simple structure and large driving torque.

[0009] (2) Servo electro-hydraulic drive is used to avoid the additional back electromotive force of the motor when direct motor drive is used and there is a phase difference requirement.

[0010] (3) It adopts servo electro-hydraulic drive, which has simple driving mode, convenient maintenance and low noise.

[0011] (4) The overflow valve and one-way valve are installed on the integrated valve block, which can meet the requirements of small size in some high-precision special occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the hydraulic drive system of the present invention;

[0014] Figure 3 for Figure 1 A partial enlarged schematic diagram of

[0015] In the figure: 1. servo motor, 2. hydraulic oil accumulator, 3. bidirectional quantitative pump, 4. oil replenishment accumulator, 5. one-way valve, 6. safety valve, 7. hydraulic sensor, 8. hydraulic cylinder, 9. displacement sensor, 10. rolling bearing, 11. rocker, 12. swing shaft. DETAILED DESCRIPTION

[0016] exist Figure 1 and Figure 2 In the schematic diagram of the electro-hydraulic driven swing mechanism shown, the servo motor 1 is connected to a two-way quantitative pump 3, and the two outlets of the two-way quantitative pump are respectively connected to the outlet of a one-way valve 5, and the inlets of the two one-way valves are connected to the oil replenishment accumulator 4. A hydraulic oil accumulator 2 is respectively arranged on the two pipelines connecting the two one-way valves and the two-way quantitative pump, and the two hydraulic oil accumulators are respectively connected to the two-way quantitative pump through a hoop. The two working oil ports of the two-way quantitative pump are also respectively connected in parallel with two safety valves 6. In order to reduce the volume and facilitate the connection, the two one-way valves and the two safety valves are concentrated in a box. The two-way quantitative pump is connected to the oil holes at both ends of the hydraulic cylinder 8 through pipelines with pressure sensors 7. The hydraulic cylinder is a double-rod structure, the piston rod is fixed, the cylinder barrel moves, the displacement sensor is a cylinder built-in displacement sensor, the magnetic ring and the non-magnetic gasket are installed on the piston section, and a connecting mechanism between the hydraulic cylinder and the swing shaft is provided on the hydraulic cylinder, that is, the cylinder barrel of the hydraulic cylinder is connected to the inner ring of a rolling bearing 10 whose axis is perpendicular to the cylinder barrel through a short shaft, and the outer ring of the rolling bearing is placed in the slide groove of the rocker 11, and the other end of the rocker is connected to the swing shaft 12, such as Figure 3 shown.

Claims

1. An electro-hydraulic driven swing mechanism, characterized in that: The servo motor is connected to a bidirectional quantitative pump, and the two outlets of the bidirectional quantitative pump are respectively connected to the outlet of a one-way valve, and the inlets of the two one-way valves are both connected to the oil replenishment accumulator. The bidirectional quantitative pump is respectively connected to the oil holes at both ends of the hydraulic cylinder through pipelines equipped with pressure sensors. The hydraulic cylinder is a double-rod structure, the piston rod is fixed, and the cylinder barrel moves. The displacement sensor is a cylinder built-in displacement sensor, and the magnetic ring and the non-magnetic gasket are installed on the piston section. A connecting mechanism between the hydraulic cylinder and the swing shaft is provided on the hydraulic cylinder, that is, the cylinder barrel of the hydraulic cylinder is connected to an inner ring of a rolling bearing whose axis is perpendicular to the cylinder barrel through a connecting piece, and the outer ring of the rolling bearing is placed in a slide groove of a rocker, and the other end of the rocker is connected to the swing shaft. The length of the rocker is determined according to the rotation angle of the swing shaft, and a limit mechanism for limiting the bearing stroke is provided in the slide groove of the rocker; a hydraulic oil accumulator is respectively provided on the two pipelines connecting the two one-way valves and the bidirectional quantitative pump; and the two working oil ports of the bidirectional quantitative pump are also respectively connected in parallel with two safety valves.

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