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CN-122014713-A - Novel electrohydraulic composite driving system

CN122014713ACN 122014713 ACN122014713 ACN 122014713ACN-122014713-A

Abstract

The invention relates to the technical field of industrial execution mechanisms, and particularly discloses a novel electro-hydraulic compound driving system which comprises an electric part, a hydraulic control part, a cylinder body assembly and a piston rod assembly, wherein the electric part comprises an electric part motor, a speed reducer, a gear box assembly, a gear transmission pair, an encoder assembly, a screw transmission pair assembly and a piston lock nut, and the hydraulic control part comprises a main electromagnetic reversing valve, an overflow valve, a first oil tank, an energy accumulator, a first electromagnetic two-position reversing valve, a bidirectional hydraulic lock, a bidirectional hydraulic pump, a hydraulic control part motor, a balance valve, a second electromagnetic two-position reversing valve, a second oil tank and a stop valve. The novel electro-hydraulic compound driving system has the advantages of large bearing of the hydraulic cylinder and high precision of the electric cylinder, expands the adaptation scene of the actuating mechanism, and improves the safety reliability and the high efficiency of the operation of industrial equipment.

Inventors

  • Miao Heyang
  • CHE XIN
  • HAN XIAOXIA
  • WANG HONG

Assignees

  • 中国人民解放军火箭军工程大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The novel electrohydraulic compound driving system is characterized by comprising an electric part, a hydraulic control part, a cylinder body assembly (8) and a piston rod assembly (9); the electric part comprises an electric part motor (1), a speed reducer (2), a gear box assembly (3), a gear transmission pair (4), an encoder assembly (5), a screw transmission pair assembly (6) and a piston lock nut (7); The hydraulic control part comprises a main electromagnetic directional valve (10), an overflow valve (11), a first oil tank (12), an energy accumulator (13), a first electromagnetic two-position directional valve (14), a bidirectional hydraulic lock (15), a bidirectional hydraulic pump (16), a hydraulic control part motor (17), a balance valve (18), a second electromagnetic two-position directional valve (19), a second oil tank (20) and a stop valve; the piston lock nut (7) is fixed at the near piston end of the piston rod assembly (9) through a radial hole, a cylindrical hollowed-out section matched with the screw rod transmission auxiliary assembly (6) is arranged in the middle of the piston rod assembly (9), and an oil inlet and an oil outlet are respectively arranged at two ends of the cylinder body assembly (8).
  2. 2. The novel electro-hydraulic compound driving system according to claim 1, wherein the main electromagnetic directional valve (10) is matched with the start-stop states of the electric part motor (1) and the hydraulic control part motor (17) through a switching station so as to switch three working modes of electric driving, hydraulic control driving and hybrid driving; the encoder assembly (5) is in transmission connection with the screw transmission auxiliary assembly (6), and the balance valve (18) is connected in series with an oil path between the main electromagnetic directional valve (10) and the cylinder assembly (8).
  3. 3. The novel electrohydraulic composite driving system of claim 2, wherein in said electric driving mode, said main electromagnetic directional valve (10) is switched to the right station, the front and back cover oil ports of the cylinder assembly (8) are communicated, the rod cavity is communicated with the oil liquid of the rodless cavity; the hydraulic control part motor (17) is powered off and stopped, and the power output by the electric part motor (1) is transmitted to the piston rod assembly (9) through the speed reducer (2), the gear transmission pair (4) and the screw transmission pair assembly (6) in sequence to drive the piston rod assembly to stretch out and draw back; the second electromagnetic two-position reversing valve (19) is matched with the second oil tank (20) to complete the supplement and discharge of oil in an oil way, and the encoder assembly (5) detects the position of the piston rod assembly (9) in real time.
  4. 4. The novel electrohydraulic composite driving system of claim 2, wherein in the hydraulic control driving mode, the main electromagnetic directional valve (10) is switched to a left station, the electric part motor (1) is started and only provides basic force for rotation of the gear transmission pair (4), and no load is born; the hydraulic control part motor (17) is started and drives the bidirectional hydraulic pump (16) to operate, and generated high-pressure oil enters a corresponding cavity of the cylinder assembly (8) through the bidirectional hydraulic lock (15) and the balance valve (18) to push the piston rod assembly (9) to stretch; The accumulator (13) supplements oil to the oil way through the stop valve, redundant oil flows back to the first oil tank (12) through the overflow valve (11), and the first electromagnetic two-position reversing valve (14) controls the oil supplementing action of the accumulator (13).
  5. 5. The novel electrohydraulic compound drive system of claim 2 wherein in said hybrid drive mode, said electric portion and said pilot operated portion cooperate to provide a speed v1 of pilot operated drive alone piston rod assembly (9) and a speed v2 of electric drive alone piston rod assembly (9) satisfying v1. Ltoreq.v 2; the movement speed and direction of the piston rod assembly (9) are regulated and controlled by an electric part, and the bearing capacity of the system is provided by a hydraulic control part.
  6. 6. The novel electro-hydraulic compound driving system as claimed in claim 1, wherein an air filter is arranged in the cylinder assembly (8) and is used for compensating the gas volume difference generated by a rod cavity and a rodless cavity of the cylinder assembly (8) when the piston rod assembly (9) stretches and contracts.
  7. 7. The novel electro-hydraulic compound driving system as set forth in claim 3, wherein an oil inlet of the second electromagnetic two-position reversing valve (19) is connected with a second oil tank (20), and an oil outlet is connected to a communication oil path between the rod cavity and the rodless cavity of the cylinder assembly (8) for supplementing and discharging oil in the electric driving mode.
  8. 8. The novel electro-hydraulic compound driving system according to claim 4, wherein the energy accumulator (13) is connected to an oil inlet side oil path of the bidirectional hydraulic lock (15) through a stop valve, and the first electromagnetic two-position reversing valve (14) is connected in parallel to an inlet of the energy accumulator (13).
  9. 9. The novel electrohydraulic composite driving system of claim 1 wherein said lead screw drive sub-assembly (6) includes a lead screw, a rotary seal assembly, a bushing, a key, a gear lock nut, and an encoder connection shaft; The right end of the screw rod is fixed on a driven gear of the gear transmission pair (4), and the shaft end extending part of the screw rod is connected with a shaft hole of the encoder assembly (5) in a matching way.
  10. 10. The novel electro-hydraulic compound driving system as set forth in claim 1, wherein the output end of the electric part motor (1) is fixedly connected with the input end of the speed reducer (2) and forms a power transmission unit, and the output end of the speed reducer (2) is fixedly connected with the driving gear of the gear transmission pair (4).

Description

Novel electrohydraulic composite driving system Technical Field The invention relates to the technical field of industrial execution mechanisms, in particular to a novel electro-hydraulic compound driving system. Background The execution mechanism is a core component for realizing mechanical movement and power output in the modern industry, and the performance of the execution mechanism directly determines the running quality and efficiency of industrial equipment. Along with the improvement of the industrial automation level, higher requirements are put on the accuracy, the load capacity, the reliability and the scene suitability of the actuating mechanism. In the prior art, the hydraulic cylinder is used as a mature executing mechanism, the hydraulic cylinder transmits pressure energy through hydraulic oil, has the advantages of high thrust and high bearing capacity, but is easy to creep under the working condition of low speed and heavy load, has poor positioning precision and control precision, limits the application of the hydraulic cylinder in a high-precision scene, and has the advantages that the electric cylinder converts electric energy into linear motion through a motor and a transmission mechanism, has high positioning precision and high response speed, but has limited load capacity, and is difficult to adapt to the working condition of high load. In order to integrate the advantages of the hydraulic cylinder and the electric cylinder, preliminary researches of electrohydraulic compound driving have been developed in the related field, but the prior art has obvious defects that a part of schemes are used for cutting or simply splicing the hydraulic cylinder and the electric cylinder, the integrated integration of core components is not realized, the working mode is single, different loads and precision requirements cannot be flexibly adapted, the problem of supplementing and discharging working media in the cylinder when a piston rod stretches and contracts is not fully considered, oil leakage risks exist, safety and reliability are insufficient, and the actual requirements of high benefit and quick output in the industrial field are difficult to meet. Therefore, the design of the novel electrohydraulic composite driving system with multiple modes, high reliability and compactness has important application value. Disclosure of Invention The invention aims to provide a novel electrohydraulic compound driving system to solve the problems of easy crawling, low positioning precision and limited load capacity of an electric cylinder of a traditional hydraulic cylinder. In order to achieve the aim, the invention provides the technical scheme that the novel electrohydraulic composite driving system comprises an electric part, a hydraulic control part, a cylinder body assembly and a piston rod assembly; The electric part comprises an electric part motor, a speed reducer, a gear box assembly, a gear transmission pair, an encoder assembly, a screw transmission pair assembly and a piston lock nut; The hydraulic control part comprises a main electromagnetic directional valve, an overflow valve, a first oil tank, an energy accumulator, a first electromagnetic two-position directional valve, a two-way hydraulic lock, a two-way hydraulic pump, a hydraulic control part motor, a balance valve, a second electromagnetic two-position directional valve, a second oil tank and a stop valve; the piston lock nut is fixed at the near-piston end of the piston rod assembly through a radial hole, a cylindrical hollowed-out section matched with the screw rod transmission pair assembly is arranged in the middle of the piston rod assembly, and an oil inlet and an oil outlet are respectively arranged at two ends of the cylinder body assembly. In the novel electro-hydraulic composite driving system of an embodiment of the invention, the main electromagnetic reversing valve is matched with the start-stop states of the electric part motor and the hydraulic control part motor through a switching station so as to switch three working modes of electric driving, hydraulic control driving and hybrid driving; the encoder assembly is in transmission connection with the screw rod transmission auxiliary assembly, and the balance valve is connected in series with an oil way between the main electromagnetic reversing valve and the cylinder body assembly. In the novel electro-hydraulic composite driving system of the embodiment of the invention, in the electric driving mode, the main electromagnetic reversing valve is switched to a right station, so that the front cover oil port and the rear cover oil port of the cylinder assembly are communicated, and the rod cavity and the rodless cavity are communicated with oil; the hydraulic control part motor is powered off and stopped, and the power output by the electric part motor is transmitted to the piston rod assembly through the speed reducer, the gear transmission pair and the screw transmissio