CN108127685A - A kind of modularization robot drives joint - Google Patents

A kind of modularization robot drives joint Download PDF

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Publication number
CN108127685A
CN108127685A CN201711378201.5A CN201711378201A CN108127685A CN 108127685 A CN108127685 A CN 108127685A CN 201711378201 A CN201711378201 A CN 201711378201A CN 108127685 A CN108127685 A CN 108127685A
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CN
China
Prior art keywords
hydraulic pump
potentiometer
hydraulic pressure
oscillating cylinder
joint
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Granted
Application number
CN201711378201.5A
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Chinese (zh)
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CN108127685B (en
Inventor
陶永
胡磊
孙贝
高彭彭
刘辉
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AOBO (Shandong) intelligent robot Co.,Ltd.
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Beihang University
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Priority to CN201711378201.5A priority Critical patent/CN108127685B/en
Publication of CN108127685A publication Critical patent/CN108127685A/en
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Publication of CN108127685B publication Critical patent/CN108127685B/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25JMANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J17/00Joints
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/04Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member with oscillating cylinder

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Manipulator (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The present invention relates to a kind of modularization robots to drive joint, is made of mechanical part and control section, mechanical part includes:Drive joint L bracket, planar side plates, swing hydraulic pressure cylinder, oscillating cylinder gear, potentiometer gear, potentiometer link block, swing hydraulic pressure cylinder cushion block, oscillating cylinder backing plate A, oscillating cylinder backing plate B, fixed end cap, motor and hydraulic pump stent, shaft coupling, control section include:Host computer, potentiometer pick-off, control signal card, flowmeter, hydraulic pump, hydraulic pump drive motor.The present invention carries out it timely adjustment, thus formation closed feedback loop, realizes the accurate control to swing hydraulic pressure cylinder by the functional relation between the hydraulic pump flow of foundation and driving joint hydraulic oscillating cylinder rotational angle;The torque of the exportable bigger in robot hydraulic-driven joint, it is simple in structure, have the characteristics that modularization, standardization realize modularized production, it can be achieved that the fast construction being connected in series with multi-degree-of-freemechanical mechanical arm of joint of mechanical arm.

Description

A kind of modularization robot drives joint
The present invention is to be based on the applying date as on December 25th, 2015, and application No. is CN201510993831.8, denominations of invention The division that a kind of invention for " modularization robot driving joint " is proposed.
Technical field
The present invention relates to a kind of driving joints of robot, and in particular to one kind is passed based on swing hydraulic pressure cylinder and current potential The modularization robot driving joint of sensor closed-loop control.
Background technology
Mechanical arm is that most widely used automated machine device is obtained in current robot field, and traditional mechanical arm It is in accordance with distinctive task design to complete, it is impossible to flexibly be changed and adjust, the ability changed according to demand is weaker. Robot Design often specifically designs each section of mechanical arm body structure etc. according to real work demand, and robot is caused to work Mode is single, and the robot assembly for designing completion is difficult, mostly non-modular designs general with other robot, component versatility It is poor.Thus the modularization of robot driving joint is also inevitable development trend.
In existing industrial robot, multifreedom motion is to be driven to complete by the servo motor of each joint mostly, And generate the problem that the driving moment that each joint servo motor generates is smaller, there is an urgent need for one kind can bear large torque and output The robot driving joint of high-torque.
Invention content
In order to overcome more than problems of the prior art, the present invention is provided one kind and is passed based on swing hydraulic pressure cylinder and current potential The modularization robot driving joint of sensor closed-loop control, drive part generate driving force by swing hydraulic pressure cylinder, can obtain The output torque and power output of bigger are obtained, and according to its modularized design, can be realized according to work and mission requirements flexible Change and be convenient to process and mount.
The present invention is provided a kind of driven based on swing hydraulic pressure cylinder and the modularization robot of potentiometric sensor closed-loop control and closed Section, it is characterised in that:The robot driving joint includes mechanical part and control section, and the mechanical part includes: Drive joint L bracket, planar side plates, swing hydraulic pressure cylinder, oscillating cylinder gear, potentiometer gear, potentiometer link block, hydraulic pressure pendulum Dynamic cylinder cushion block, oscillating cylinder backing plate A, oscillating cylinder backing plate B, fixed end cap, motor and hydraulic pump stent, shaft coupling;The control unit Divide and include:Host computer, potentiometer pick-off, control signal card, flowmeter, hydraulic pump, hydraulic pump drive motor, 3-position 4-way electricity Magnetic reversal valve, overflow valve A, overflow valve B;The driving joint L bracket and planar side plates are used to implement consolidating for swing hydraulic pressure cylinder Fixed connection, the swing hydraulic pressure cylinder are fixed on inside driving joint L bracket;The oscillating cylinder gear and potentiometer gear Engaged transmission is formed, and potentiometer gear is fixed on potentiometer link block, swing hydraulic pressure cylinder cushion block is put for fixed hydraulic Dynamic cylinder;The planar side plates and L bracket side are both provided with through-hole, and the output shaft end of the swing hydraulic pressure cylinder sequentially passes through flat Through-hole, swing hydraulic pressure cylinder cushion block, oscillating cylinder gear, driving articular branches support L bracket center side through-hole on the plate of surface side are simultaneously It is secured by bolts in driving articular branches support L bracket;The swing hydraulic pressure cylinder cushion block is located at swing hydraulic pressure cylinder and driving Between articular branches support L bracket, for fixed hydraulic oscillating cylinder;The oscillating cylinder backing plate A and oscillating cylinder backing plate B is for solid Surely joint hydraulic oscillating cylinder is driven, wherein oscillating cylinder backing plate A is located between planar side plates and driving joint hydraulic oscillating cylinder end, Oscillating cylinder backing plate B is between swing hydraulic pressure cylinder cushion block and oscillating cylinder gear;The center of the swing hydraulic pressure cylinder cushion block and driving The through-hole of articular branches support L bracket side is concentric;The potentiometer pick-off is fixed by screws on potentiometer link block, Potentiometer link block is fixed by screws on oscillating cylinder backing plate, and potentiometer gear, the hydraulic pressure are fixed on potentiometer pick-off Oscillating cylinder gear is fixed on oscillating cylinder output shaft, and engaged transmission is formed with potentiometer gear.The electrical machinery hydraulic pump stent U-shaped, two sides are provided with through-hole, and through-hole is concentric, and for the fixation of motor and hydraulic pump, the shaft coupling is used to connect The drive shaft of hydraulic pump drive motor output shaft and hydraulic pump.
The control signal card for sending the drive signal of hydraulic pump drive motor, and obtains and passes through flow measurement The angle that the flow of the hydraulic pump obtained is rotated with potentiometer pick-off.The hydraulic pump drive motor receiving comes from control The output signal of signal card, and according to signal come output motor rotating speed, to drive the rotation of hydraulic pump, the hydraulic pump via Drive hydraulic motor drives, and for sucking fluid from hydraulic oil container, forms pressure oil and discharges, drive this robot driving joint Internal swing hydraulic pressure cylinder, so as to make joint motions;The flowmeter feeds back for measuring the output flow from hydraulic pump In host computer;The potentiometer pick-off is used to measure the rotational angle of swing hydraulic pressure cylinder, and feeds back in host computer, described The output flow value for the hydraulic pump that flow measurement obtains forms a kind of correspondence with driving joint hydraulic oscillating cylinder rotational angle, from And establish corresponding functional relation, the potentiometer pick-off is used to measure the rotational angle of swing hydraulic pressure cylinder, and feed back in Host computer, after host computer receives the signal of flowmeter and potentiometer pick-off, according to the physical location and target location reached Carry out comparison judgement, if position accurately if host computer send out next step movement instruction, if there is error to pass through established flow Functional relation between the hydraulic pump flow value and driving joint hydraulic oscillating cylinder rotational angle that measure is adjusted, and is formed anti- Feedback, and then form closed-loop control.
The modularization is modularization robot driving joint, drives the bottom surface of the L bracket of articular branches support It is both provided with threaded hole, and then drives diarthrodial threaded hole by each and interconnect it is achieved thereby that being easily installed and production application Modularization.
The potentiometer pick-off closed-loop control is to obtain potentiometer rotational angle, analysis comparison target by host computer Control signal card is output to after position data, through processing, control signal control hydraulic pump drive electricity is retransmited by control signal card The rotating speed of machine, hydraulic pump drive motor drive pressure oil output after hydraulic pump rotation, and pressure oil passes through the measurement of flowmeter, defeated Outflow feedback drives the movement of the swing hydraulic pressure cylinder of intra articular in host computer, pressure oil, swing hydraulic pressure cylinder output shaft end The engaged transmission of oscillating cylinder gear and potentiometer gear, potentiometer pick-off is obtained by the potentiometer gear being mounted thereon to be turned Dynamic signal, feeds back in host computer, and then forms closed-loop control.
Description of the drawings
Fig. 1 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The overall structure diagram of section.
Fig. 2 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The explosive view of section.
Fig. 3 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The joint control schematic diagram of section.
Fig. 4 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The swing hydraulic pressure cylinder drive component figure of section.
Fig. 5 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The potentiometric sensor connection figure of section.
Fig. 6 is that the present invention is a kind of to be closed based on swing hydraulic pressure cylinder and the driving of the modularization robot of potentiometric sensor closed-loop control The hydraulic system operation logic figure of section.
The meaning of each label is as follows in figure:
1:Potentiometric sensor;2:Potentiometer link block;3:Potentiometer gear;4:Drive joint L bracket;5:Fixing end Lid;6:Oscillating cylinder gear;7:Oscillating cylinder backing plate A;8:Swing hydraulic pressure cylinder cushion block;9:Swing hydraulic pressure cylinder;10:Oscillating cylinder backing plate B;11 Fixed end cap;12:Planar side plates;13:Hydraulic pump drive motor;14:Motor and hydraulic pump stent;15:Shaft coupling;16:Hydraulic pressure Pump;17:Flowmeter;18 control signal cards;20:Host computer;21:Three-position four-way electromagnetic directional valve;22:Overflow valve A;23:Overflow Valve B.
Specific embodiment
In order to be best understood from technical scheme of the present invention and advantage, below by way of specific embodiment, and with reference to attached drawing pair The present invention is described further.
The present invention is provided a kind of driven based on swing hydraulic pressure cylinder and the modularization robot of potentiometric sensor closed-loop control and closed Section, as shown in figures 1 to 6, entire modularization robot driving joint include mechanical part and control section, the mechanical part Including:Joint L bracket 4, planar side plates 12, swing hydraulic pressure cylinder 9, oscillating cylinder gear 6, potentiometer gear 3, potentiometer is driven to connect Connect block 2, swing hydraulic pressure cylinder cushion block 8, oscillating cylinder backing plate A7, oscillating cylinder backing plate B10, fixed end cap 11, motor and hydraulic pump stent 14th, shaft coupling 15;The control section includes:Host computer 20, potentiometric sensor 1, control signal card 18, flowmeter 17, hydraulic pressure Pump 16, hydraulic pump drive motor 13, three-position four-way electromagnetic directional valve 21, overflow valve A22, overflow valve B23.
Driving joint L bracket 4, planar side plates 12, oscillating cylinder gear 6, potentiometer gear 3, potentiometer in the present invention Link block 2, swing hydraulic pressure cylinder cushion block 8, oscillating cylinder backing plate A7, oscillating cylinder backing plate B10, fixed end cap 11, motor and hydraulic pump branch Frame 14 is required for being processed according to design requirement;Swing hydraulic pressure cylinder 9, potentiometric sensor 1, hydraulic pump drive motor 13, hydraulic pressure Pump 16, flowmeter 17, host computer 20, control signal card 18, shaft coupling 15, three-position four-way electromagnetic directional valve 21, overflow valve A22, Overflow valve B23 is required for carrying out matching purchase according to required size.
As shown in Figure 1 and Figure 2, the driving joint L bracket 4 and planar side plates 12 are used to implement consolidating for swing hydraulic pressure cylinder 9 Fixed connection, the swing hydraulic pressure cylinder 9 are fixed on inside driving joint L bracket 4;The oscillating cylinder gear 6 and potentiometer Gear 3 forms engaged transmission, and potentiometer gear 3 is fixed on potentiometer link block 2, and swing hydraulic pressure cylinder cushion block 8 is for solid Determine swing hydraulic pressure cylinder 9;The planar side plates 12 and L bracket side are both provided with through-hole, the output shaft of the swing hydraulic pressure cylinder 9 Hold the through-hole sequentially passed through in planar side plates 12, swing hydraulic pressure cylinder cushion block 8, oscillating cylinder gear 6, driving joint L bracket side Central through hole is simultaneously secured by bolts in driving joint L bracket;The swing hydraulic pressure cylinder cushion block 8 is located at swing hydraulic pressure cylinder 9 Between driving joint L bracket, for fixed hydraulic oscillating cylinder 9;The oscillating cylinder backing plate A7 and oscillating cylinder backing plate B10 is used In fixed driving joint hydraulic oscillating cylinder 9, wherein oscillating cylinder backing plate A7 is located at planar side plates 12 and driving joint hydraulic oscillating cylinder 9 Between end, oscillating cylinder backing plate B10 is located between swing hydraulic pressure cylinder cushion block 8 and oscillating cylinder gear 6;The swing hydraulic pressure cylinder cushion block 8 center is concentric with driving the through-hole of joint L bracket side;The potentiometer pick-off is fixed by screws in potentiometer company It connects on block 2, potentiometer link block 2 is fixed by screws on oscillating cylinder backing plate, and potentiometer gear is fixed on potentiometer pick-off 3, oscillating cylinder gear 6 is fixed on 9 output shaft of swing hydraulic pressure cylinder, and engaged transmission is formed with potentiometer gear 3.
As shown in Fig. 2, joint L bracket and planar side plates 12 are fixed by screw, the end of driving joint hydraulic oscillating cylinder 9 Axle portion is held to pass through oscillating cylinder backing plate A7 and planar side plates 12, the output shaft end of swing hydraulic pressure cylinder 9 sequentially passes through swing hydraulic pressure cylinder pad The side through-hole of block 8, oscillating cylinder backing plate B10 and oscillating cylinder gear 6, bracket L bracket, and pass through screw and fix, potentiometer connects It connects block 2 to be fixed on oscillating cylinder backing plate B10 by screw, potentiometer pick-off passes through potentiometer link block 2 and potentiometer gear 3 It is connected, potentiometer gear 3 forms engaged transmission with oscillating cylinder gear 6.
As shown in figure 3, the total system control principle drawing for the present invention, wherein it is concurrent to set target location by host computer 20 Go out control instruction and receive and come from the data that flowmeter 17 and potentiometer pick-off are fed back to, the feedback data received is passed through Contrast signal is sent after being compared with target location to control signal card 18, control signal card 18 is analyzed according to 20 program of host computer The data obtained after being compared with target location, to send out next step control instruction, control hydraulic pump drive motor 13 turns Speed, hydraulic pump 16 suck hydraulic oil, form pressure oil, pressure oil output, so as to make by the drive of hydraulic pump drive motor 13 The swing hydraulic pressure cylinder 9 of driving intra articular is moved, and the pressure oil flow of output after the calculating of flowmeter 17 by feeding back to Host computer 20, and the rotational angle parameter of swing hydraulic pressure cylinder 9 passes through after the engaged transmission of oscillating cylinder gear 6 and potentiometer gear 3 Data obtain feedback in host computer 20 by potentiometer pick-off, and then being passed based on swing hydraulic pressure cylinder 9 and current potential described in realization The modularization robot driving joint of 1 closed-loop control of sensor.
As shown in figure 4, the 9 drive component figure of swing hydraulic pressure cylinder in joint is driven for the present invention, wherein, hydraulic pump drives Dynamic motor 13 is connected with hydraulic pump 16 by shaft coupling 15, and is fixed on motor and hydraulic pump stent 14, hydraulic pump drive electricity Machine 13, control signal is sent by control signal card 18, after its rotation, hydraulic pump 16 is driven to rotate, hydraulic pump 16 sucks hydraulic pressure Oil, forms hydraulic oil, and pressure oil output forms the rotation in joint to the swing hydraulic pressure cylinder 9 of driving intra articular.
As shown in figure 5, driving the installation connection figure of potentiometric sensor 1 in joint for the present invention, potentiometer link block 2 passes through Screw is fixed on oscillating cylinder backing plate B10, and potentiometric sensor 1 passes through the hole on potentiometer link block 2 to be fixed on potentiometer connection On block 2, wherein 1 end of potentiometric sensor connection potentiometer gear 3, and with the oscillating cylinder gear 6 on swing hydraulic pressure cylinder 9 Form engaged transmission.
As shown in fig. 6, for the diarthrodial hydraulic principle schematic diagram of present invention drive, in figure, three-position four-way electromagnetic directional valve 21 connects The exit of hydraulic pump 16 is connected to, for changing the break-make of oil circuit, and then realizes changing for driving intra articular swing hydraulic pressure cylinder 9 To overflow valve A22 is mounted on 16 exit of system hydraulic pump and overflow valve B23 is mounted on returning for driving joint hydraulic system Oil place, during system worked well, overflow valve A22 valves are closed, only load more than the defined limit when open overflow, carried out Protection is carried, system pressure is made not to be further added by, plays safeguard protection, overflow valve B23 is connected on oil return line, plays pressure stabilization function.
It should be noted that the above is merely illustrative of the technical solution of the present invention, rather than its limitations;Although reference The present invention is described in detail in foregoing description, it will be understood by those of ordinary skill in the art that:It still can be to preceding Listed technical solution is stated to modify either to which part or all technical features progress equivalent replacement;And these Modification is replaced, the range of each listed technical solution of the present invention that it does not separate the essence of the corresponding technical solution.

Claims (1)

1. a kind of modularization robot drives joint, it is characterised in that:The robot driving joint include mechanical part and Control section, the mechanical part include:Drive joint L bracket, planar side plates, swing hydraulic pressure cylinder, oscillating cylinder gear, electricity Position device gear, potentiometer link block, swing hydraulic pressure cylinder cushion block, oscillating cylinder backing plate A, oscillating cylinder backing plate B, fixed end cap, motor with Hydraulic pump stent, shaft coupling;The control section includes:Host computer, potentiometer pick-off, control signal card, flowmeter, hydraulic pressure Pump, hydraulic pump drive motor, three-position four-way electromagnetic directional valve, overflow valve A, overflow valve B;The driving joint L bracket peace Surface side plate is used to implement being fixedly connected for swing hydraulic pressure cylinder, and the swing hydraulic pressure cylinder is fixed on inside driving joint L bracket; The oscillating cylinder gear and potentiometer gear form engaged transmission, and potentiometer gear is fixed on potentiometer link block, Swing hydraulic pressure cylinder cushion block is used for fixed hydraulic oscillating cylinder;The planar side plates and L bracket side are both provided with through-hole, the liquid The output shaft end of pressure oscillating cylinder sequentially passes through through-hole in planar side plates, swing hydraulic pressure cylinder cushion block, oscillating cylinder gear, driving joint L bracket center side through-hole is simultaneously secured by bolts in driving joint L bracket;The oscillating cylinder cushion block is located at hydraulic pressure pendulum Between dynamic cylinder and driving joint L bracket, for fixed hydraulic oscillating cylinder;It is closed with driving at the center of the swing hydraulic pressure cylinder cushion block The through-hole for saving L bracket side is concentric;In the control section, hydraulic pump drive motor is connected by shaft coupling with hydraulic pump And it is mounted on motor and hydraulic pump stent;The potentiometer pick-off is fixed by screws on potentiometer link block, Potentiometer link block is fixed by screws on oscillating cylinder backing plate B, and potentiometer gear, the hydraulic pressure are fixed on potentiometer pick-off Oscillating cylinder gear is fixed on oscillating cylinder output shaft, and engaged transmission is formed with potentiometer gear;The motor and hydraulic pump branch Frame is U-shaped, and two sides are provided with through-hole, and through-hole is concentric, for the fixation of hydraulic pump drive motor and hydraulic pump;The connection Axis device is used to connect the drive shaft of hydraulic pump drive motor output shaft and hydraulic pump;The three-position four-way electromagnetic directional valve connection In the exit of hydraulic pump, for changing the break-make of oil circuit, and then the commutation of the swing hydraulic pressure cylinder of driving intra articular is realized;Institute The overflow valve A stated is mounted on system hydraulic pump exit and overflow valve B is mounted at the oil return of driving joint hydraulic system, During system worked well, overflow valve A valves are closed, and overflow is opened when only load is more than the defined limit, carry out overload protection, System pressure is made not to be further added by, plays safeguard protection, overflow valve B is connected on oil return line, plays pressure stabilization function;The control Signal card, for sending the drive signal of hydraulic pump drive motor, and obtain the flow of the hydraulic pump obtained by flow measurement with The angle that potentiometer pick-off is rotated;The hydraulic pump drive motor receiving comes from the output signal of control signal card, And driving motor rotating speed is pumped come output hydraulic pressure according to signal, to drive the rotation of hydraulic pump, the hydraulic pump is via hydraulic pump Driving motor drives, and for sucking fluid from hydraulic oil container, forms pressure oil and discharges, drive inside this robot driving joint Swing hydraulic pressure cylinder, so as to make joint motions;The flowmeter is fed back for measuring the output flow from hydraulic pump in upper Position machine;The output flow value for the hydraulic pump that the flow measurement obtains forms one kind with driving joint hydraulic oscillating cylinder rotational angle Correspondence, so as to establish corresponding functional relation, the potentiometer pick-off is used to measure the angle of rotation of swing hydraulic pressure cylinder Degree, and feed back in host computer, after host computer receives the signal of flowmeter and potentiometer pick-off, according to the physical location reached Carry out comparison judgement with target location, if position accurately if host computer send out next step movement instruction, if there is error to pass through Hydraulic pump flow value that the flow measurement of foundation obtains and drive functional relation between diarthrodial swing hydraulic pressure cylinder rotational angle into Row is adjusted, and forms feedback, and then form closed-loop control;
The bottom surface of the L bracket of the driving articular branches support is provided with threaded hole, mutual by each diarthrodial threaded hole of drive Connection.
CN201711378201.5A 2015-12-25 2015-12-25 Modular robot driving joint Active CN108127685B (en)

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CN201711378201.5A CN108127685B (en) 2015-12-25 2015-12-25 Modular robot driving joint

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CN107605834B (en) * 2017-08-09 2019-02-22 太原理工大学 A kind of pressure stabilizing feed liquid method adapting to hydraulic support movement
CN110550190B (en) * 2019-07-25 2023-08-25 上海航天控制技术研究所 Electric hydrostatic pump control rotary steering engine
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CN105945982A (en) 2016-09-21
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