WO2017197902A1 - Dispositif de cylindre d'entraînement électrique intelligent - Google Patents

Dispositif de cylindre d'entraînement électrique intelligent Download PDF

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Publication number
WO2017197902A1
WO2017197902A1 PCT/CN2017/000259 CN2017000259W WO2017197902A1 WO 2017197902 A1 WO2017197902 A1 WO 2017197902A1 CN 2017000259 W CN2017000259 W CN 2017000259W WO 2017197902 A1 WO2017197902 A1 WO 2017197902A1
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WO
WIPO (PCT)
Prior art keywords
sleeve
outer tube
wall
cylinder sleeve
electric drive
Prior art date
Application number
PCT/CN2017/000259
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English (en)
Chinese (zh)
Inventor
潘微杰
Original Assignee
潘微杰
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 潘微杰 filed Critical 潘微杰
Publication of WO2017197902A1 publication Critical patent/WO2017197902A1/fr

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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • E05F15/50Power-operated mechanisms for wings using fluid-pressure actuators
    • E05F15/53Power-operated mechanisms for wings using fluid-pressure actuators for swinging wings
    • 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
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/088Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • 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
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • 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
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00Constructional elements; Accessories therefor
    • E05Y2201/40Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/43Motors
    • E05Y2201/448Fluid motors; Details thereof
    • E05Y2201/454Cylinders
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00Application of doors, windows, wings or fittings thereof
    • E05Y2900/50Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53Type of wing
    • E05Y2900/531Doors
    • E05Y2900/532Back doors or end doors
    • 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
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B2015/1495Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston

Definitions

  • the present invention relates to an electric drive device, and more particularly to a drive device applied to a tailgate of an automobile.
  • tailgates There are two main types of tailgates. The first one is the manual tailgate, which uses the gas spring to realize the manual switch. This type of structure is mainly used in the middle and low-end vehicles. The second is the electric tailgate, which uses the motor drive to realize the tailgate.
  • the automatic lifting and lowering operation is convenient and quick, and at the same time solves the problem that most female passengers have difficulty in opening the tailgate due to small strength.
  • the Chinese invention patent application with the application number 201010288083.0 discloses the "automobile electric tailgate drive mechanism" (application publication number is CN101967930A), and the application includes a motor, a motor sleeve, a screw sleeve, and a multi-head.
  • the lead screw, the multi-head nut and the spring, the multi-head screw is driven by the micro motor to move the multi-head nut relative to the multi-head screw, and the nut sleeve moves relative to the screw sleeve.
  • the Chinese invention patent application with the application number 201410206864.9 discloses the "automobile tailgate electric lifting device" (application publication number is CN105089408A).
  • the driving device of the above-mentioned electric tailgate is mainly supported by a steel spring, and the driving force is generated by the motor, and the expansion and contraction is realized by the screw rod.
  • the steel spring has the following disadvantages: First, the steel spring has poor stability and is easily broken. There are safety hazards. Secondly, the weight of the tailgate of the car is different. It needs to adapt to different specifications of the drive device, and the steel spring torque can not be adjusted. Again, the steel spring is easy to rub against the steel pipe wall in the reciprocating motion to generate noise; The steel spring must be made relatively large, and the whole is relatively bulky, so that the bearing capacity is doubled when the tailgate is closed at both ends, and the strength requirements of the fixing devices at both ends are increased.
  • the technical problem to be solved by the present invention is to provide a compact and lightweight intelligent electric drive cylinder device for the above-mentioned state of the art.
  • Still another technical problem to be solved by the present invention is to provide an intelligent electric drive cylinder device with low noise for the above-mentioned state of the art.
  • Still another technical problem to be solved by the present invention is to provide an intelligent electric drive cylinder device which is easy to manufacture in view of the above state of the art.
  • an intelligent electric drive cylinder device characterized in that it comprises
  • a DC motor disposed in the outer tube and provided with a sensor
  • a speed reducer disposed in the outer tube and connected to the power output end of the DC motor
  • the cylinder sleeve is movable back and forth relative to the outer tube and comprises a small cylinder sleeve and a large cylinder sleeve.
  • the small cylinder sleeve is located in the middle of the large cylinder sleeve, and an annular region is formed between the outer wall of the small cylinder sleeve and the inner wall of the large cylinder sleeve;
  • a piston rod which is hollow to form an inner cavity and has a piston at the front end, the piston rod is sleeved on the small cylinder sleeve, and the piston is located in an annular region between the outer wall of the small cylinder sleeve and the inner wall of the large cylinder sleeve;
  • a multi-head screw having one end connected to the output end of the aforementioned reducer and the other end extending into the small cylinder sleeve and being coupled with the aforementioned wire sleeve;
  • the positioning sleeve is disposed on the inner wall of the large cylinder liner and can restrict the piston rod from being separated from the large cylinder sleeve.
  • the fixing of the reducer is selected as follows: the reducer is disposed on a fixed sleeve of the reducer, and the fixed sleeve of the reducer is disposed in the outer tube.
  • a small O-ring is disposed on the piston.
  • the piston is provided with a through hole, and the through hole communicates with the air chambers at both ends of the piston.
  • the outer tube is provided with an outer tube cover, and the ball stud connection member is disposed on the outer tube cover, and the outer tube is provided with a large O-ring.
  • the piston is provided with a small oil seal
  • the positioning sleeve is provided with a large oil seal
  • the senor is a magnetic ring rotating bi-directional Hall sensor.
  • the outer wall of the large cylinder sleeve has a cylinder sleeve protrusion.
  • the outer tube inner wall has an outer tube groove that is in guiding engagement with the cylinder sleeve protrusion.
  • the front end of the outer tube is provided with a waterproof ring, and the waterproof ring is in close contact with the outer wall of the cylinder liner. In order to prevent rainwater and the outer tube, it will affect the normal operation of the DC motor.
  • the multi-head screw is connected to the speed reducer by a cross pin.
  • a through hole is formed in the piston, and the through hole communicates with the air chambers at both ends of the piston.
  • the invention has the advantages that: the hollow piston rod and the matching structure of the large cylinder sleeve and the small cylinder sleeve can drive the multi-head screw completely back and forth in the small cylinder sleeve, and the working area of the piston is a ring shape.
  • the internal pressure space can be fully utilized to make the overall volume smaller and lighter.
  • both the driving structure and the supporting structure are arranged inside and outside, which can effectively reduce the overall length and expand the application space; in addition, the multi-head screw and the wire sleeve The rotation fits in a relatively closed space, so the noise generated is greatly reduced.
  • the invention has simple processing technology, can generate different torques to offset the up and down movement gravity of the article, reduce the number of motor watts, and save energy; it can also effectively prevent the cylinder sleeve from rotating, reduce friction and prolong the service life of the cylinder.
  • the application of the invention is not limited to the lifting and lowering of the tailgate of the automobile, and the structure adopting the gas spring as the lifting support can be replaced by the electric method of the invention, such as the rotation adjustment of the solar panel, the electric lifting of the medical bed and the protective cover of the range hood. Electric opening and closing, etc.
  • FIG. 1 is a schematic view showing the appearance of the embodiment 1 when shortened.
  • Figure 2 is a cross-sectional view of Figure 1.
  • Figure 3 is an exploded view of Embodiment 1.
  • Figure 4 is an enlarged view of a portion of the cylinder liner of Figure 2.
  • Fig. 5 is a structural schematic view showing the joint portion of the outer tube and the cylinder liner in the first embodiment.
  • Fig. 6 is a schematic view showing the structure of a driving portion of the embodiment 1.
  • Fig. 7 is an enlarged cross-sectional view showing the elongation of Example 1.
  • Figure 8 is a schematic view showing the structure of the cylinder liner in the second embodiment.
  • the intelligent electric drive cylinder device in the embodiment can be applied to the lifting and lowering of the tailgate of the automobile, and specifically includes an outer tube 1, a direct current motor 6, a reducer 5, a cylinder liner 2, a piston rod 4, The wire sleeve 31, the multi-head screw 3 and the positioning sleeve 33.
  • the front end of the outer tube 1 is provided with a waterproof ring 36 which is in close contact with the outer wall of the cylinder liner 2.
  • the outer tube 1 is provided with an outer tube suffocating cover 7 at its end, and the outer tube suffocating cover 7 is provided with an O-ring 71.
  • a ball stud connection member 81 is provided on the outer tube cover 7, and the outer tube cover 7 is provided with a large O-ring.
  • the DC motor 6 is disposed in the outer tube 1 and is provided with a sensor 61.
  • the DC motor 6 has an external power supply line 62.
  • the sensor 61 in this embodiment is a magnetic ring rotating bidirectional Hall sensor.
  • the speed reducer 5 is disposed in the outer tube 1 and is connected to the power output end of the DC motor 6 at the input end. Specifically, the speed reducer 5 is disposed on the reducer fixing sleeve 34, and the speed reducer is fixed.
  • the sleeve 34 is disposed in the outer tube 1, and the reducer fixing sleeve 34 is provided with an O-ring 35.
  • the cylinder liner 2 can move back and forth relative to the outer tube 1 and includes a small cylinder sleeve 22 and a large cylinder sleeve 21.
  • the small cylinder sleeve 22 is located in the middle of the large cylinder sleeve 21, and an annular region is formed between the outer wall of the small cylinder sleeve 22 and the inner wall of the large cylinder sleeve 21.
  • the wire sleeve 31 is disposed on the inner wall of the small cylinder liner 22.
  • the piston rod 4 is hollow to form an inner cavity and the front end forms a piston 41.
  • the piston rod 4 is sleeved on the small cylinder sleeve 22.
  • the piston 41 is located in an annular region between the outer wall of the small cylinder sleeve 22 and the inner wall of the large cylinder sleeve 21, and the piston 41
  • a small oil seal 43 and a small O-ring 42 are provided.
  • the positioning sleeve 33 is disposed on the inner wall of the large cylinder sleeve 21 and can restrict the piston rod 4 is separated from the large cylinder sleeve 21, and the positioning sleeve 33 is provided with a large oil seal 32.
  • the front end of the cylinder liner 2 and the end of the outer tube 1 are respectively provided with a ball stud connection member 81 and a ball stud connection member 82.
  • the outer wall of the large cylinder sleeve 21 has a cylinder sleeve protrusion 23, and correspondingly, the inner wall of the outer tube 1 has an outer tube groove 11 which is in guiding engagement with the cylinder sleeve protrusion 23.
  • the working principle the DC motor 6 drives the multi-head screw 3 to move back and forth through the reducer 5, and the sleeve 31 is fixedly connected with the small cylinder sleeve 22, so that the sleeve 31 drives the cylinder liner 2 to move back and forth as a whole. To achieve lifting. At the same time, the piston rod 4 moves back and forth in the annular region to provide sufficient support.
  • the sealed cylinder liner 2 can generate a one-way strong thrust.
  • the small cylinder sleeve 22 and the annular region of the large cylinder liner 21 are filled with compressed gas; the multi-head screw rod 3, the wire sleeve 31 and the DC motor 6 form an electric cylinder push rod. Let it move in a straight line; the sensor 61 is used to detect the running condition of the DC motor 6. Specifically, the DC motor 6 rotates one revolution and the Hall emits three or seven (1 to 12) pulse signals, and two Hall elements come out. The signals make the two pulse signals into a quarter phase difference (90 degree phase difference), thereby calculating the number of digital pulses up or down and the lap speed of the motor rotation, reflecting the operating condition and operating position of the device.
  • the composition of the cylinder liner 2 and the multi-head screw 3, the wire sleeve 31, the sensor 61, and the DC motor 6 allow the product to be extended and shortened to generate two different moments (for example, the torque generated by the elongation is 900 N, and the generated torque is shortened). 200N), this can make the object move up and down to offset the gravity. Originally, a 30W motor is needed. Now, as long as the 15W DC motor 6 can be used, the product can be reduced, energy is saved, and the linear push-cylinder push rod bearing capacity is greatly reduced. In the case of no power, the object can be pushed with less force.
  • the piston 41 in the embodiment is provided with a through hole 411, which communicates with the air chambers at the front and rear ends of the piston 41, so that the piston rod 4 can be in a large pressure difference when moving.
  • the flow in the hole ensures balance, so that the piston 41 is substantially stabilized by the force of the compressed gas, thereby achieving superior performance than the steel spring.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Fluid-Damping Devices (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un dispositif de cylindre d'entraînement électrique intelligent, comprenant un tube externe (1), un moteur à courant continu (6), un réducteur (5), un manchon de cylindre (2), une tige de piston (4), un manchon de vis (31), une tige de vis à multiples têtes (3) et un manchon de positionnement (33). Le manchon de cylindre (2) se déplace en va-et-vient par rapport au tube externe (1) et comprend un petit manchon de cylindre (22) et un grand manchon de cylindre (21), le petit manchon de cylindre (22) étant situé au milieu du grand manchon de cylindre (21), une zone annulaire étant formée entre une paroi externe du petit manchon de cylindre (22) et une paroi interne du grand manchon de cylindre (21). La tige de piston (4) est creuse pour former une cavité interne et une extrémité avant forme un piston (41), la tige de piston (4) étant emmanchée sur le petit manchon de cylindre (22), le piston (41) étant situé dans la zone annulaire entre la paroi externe du petit manchon de cylindre (22) et la paroi interne du grand manchon de cylindre (21). Une extrémité de la tige de vis à multiples têtes (3) est reliée à une extrémité de sortie du réducteur (5), et l'autre extrémité s'étend dans le petit manchon de cylindre (22) et est reliée au manchon de vis (31) et mise en correspondance avec ce dernier. Par comparaison avec l'état de la technique, la présente invention a les avantages d'avoir une structure compacte, légère et pratique et de réduire le bruit.
PCT/CN2017/000259 2016-05-20 2017-03-29 Dispositif de cylindre d'entraînement électrique intelligent WO2017197902A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201610356480.4 2016-05-20
CN201610356480 2016-05-20
CN201610409450.5 2016-06-12
CN201610409450.5A CN105952706B (zh) 2016-05-20 2016-06-12 智能电动驱动气缸装置
CN201710113046.8A CN107143241B (zh) 2016-05-20 2017-02-28 智能电动驱动气缸装置
CN201710113046.8 2017-02-28

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Publication Number Publication Date
WO2017197902A1 true WO2017197902A1 (fr) 2017-11-23

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PCT/CN2016/000310 WO2017197543A1 (fr) 2016-05-20 2016-06-17 Dispositif de cylindre d'entraînement électrique intelligent
PCT/CN2017/000259 WO2017197902A1 (fr) 2016-05-20 2017-03-29 Dispositif de cylindre d'entraînement électrique intelligent

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CN (3) CN205669517U (fr)
WO (2) WO2017197543A1 (fr)

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CN107816284A (zh) * 2017-11-30 2018-03-20 无锡典聚科技有限公司 一种用于电动尾门球头与外管的连接结构
CN107829636A (zh) * 2017-11-30 2018-03-23 无锡典聚科技有限公司 一种汽车电动尾门撑杆减速电机止转结构
CN107829639A (zh) * 2017-11-30 2018-03-23 无锡典聚科技有限公司 一种电动尾门撑杆导向杆与外管的止转结构
CN107863844A (zh) * 2017-12-25 2018-03-30 西安方元明科技股份有限公司 一种多级伸缩电动缸
CN109361288A (zh) * 2018-11-26 2019-02-19 苏州江森特自动化科技有限公司 一种电动缸
CN111219377A (zh) * 2018-11-26 2020-06-02 徐州徐工液压件有限公司 一种智能液压缸装置及控制方法
CN112211948A (zh) * 2020-11-04 2021-01-12 南京默凯尼克机电有限公司 具有油气辅助缓冲结构的电动缸
CN112392358A (zh) * 2019-08-16 2021-02-23 上海驭华电动气弹簧有限公司 电动多级传动伸缩推拉杆
CN113153058A (zh) * 2021-03-23 2021-07-23 宁波信泰机械有限公司 一种电动撑杆改进结构及其安装方法
CN117948393A (zh) * 2024-03-25 2024-04-30 山东星辉液压设备有限公司 一种剪叉式高空作业车用举升电动缸

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CN205669517U (zh) * 2016-05-20 2016-11-02 潘微杰 智能电动驱动气缸装置
CN106246789A (zh) * 2016-10-11 2016-12-21 杨均 一种电动气弹簧
CN107605847B (zh) * 2017-08-07 2019-05-24 浙江大学宁波理工学院 直线电机驱动的气弹簧装置
CN107795222A (zh) * 2017-11-30 2018-03-13 无锡典聚科技有限公司 一种车辆电动尾门撑杆丝杆与减速箱输出轴连接结构
CN108134479B (zh) * 2017-12-22 2019-07-16 深圳市精艺精汽车配件有限公司 一种新型电动推杆
CN109610967A (zh) * 2019-01-31 2019-04-12 宁波拓尔精工机械有限公司 电动驱动气缸装置
CN110356545A (zh) * 2019-08-21 2019-10-22 成都弗格森液压机电有限公司 一种无人机起落架收放用锁紧机构

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CN1891963A (zh) * 2005-07-08 2007-01-10 斯塔比卢斯有限责任公司 使可绕转动轴转动的车辆活动门进行电动驱动和机械驱动运动的装置
CN201214937Y (zh) * 2008-06-26 2009-04-01 深圳嘉贸气动器材有限公司 一种可充气体的气弹簧
CN203835112U (zh) * 2014-05-09 2014-09-17 王水娟 自动开关门门轴
CN205669517U (zh) * 2016-05-20 2016-11-02 潘微杰 智能电动驱动气缸装置

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CN107816284A (zh) * 2017-11-30 2018-03-20 无锡典聚科技有限公司 一种用于电动尾门球头与外管的连接结构
CN107829636A (zh) * 2017-11-30 2018-03-23 无锡典聚科技有限公司 一种汽车电动尾门撑杆减速电机止转结构
CN107829639A (zh) * 2017-11-30 2018-03-23 无锡典聚科技有限公司 一种电动尾门撑杆导向杆与外管的止转结构
CN107863844A (zh) * 2017-12-25 2018-03-30 西安方元明科技股份有限公司 一种多级伸缩电动缸
CN109361288A (zh) * 2018-11-26 2019-02-19 苏州江森特自动化科技有限公司 一种电动缸
CN111219377A (zh) * 2018-11-26 2020-06-02 徐州徐工液压件有限公司 一种智能液压缸装置及控制方法
CN109361288B (zh) * 2018-11-26 2023-08-29 苏州江森特自动化科技有限公司 一种电动缸
CN112392358A (zh) * 2019-08-16 2021-02-23 上海驭华电动气弹簧有限公司 电动多级传动伸缩推拉杆
CN112392358B (zh) * 2019-08-16 2024-05-10 上海迪洲船用厨房设备有限公司 电动多级传动伸缩推拉杆
CN112211948A (zh) * 2020-11-04 2021-01-12 南京默凯尼克机电有限公司 具有油气辅助缓冲结构的电动缸
CN113153058A (zh) * 2021-03-23 2021-07-23 宁波信泰机械有限公司 一种电动撑杆改进结构及其安装方法
CN117948393A (zh) * 2024-03-25 2024-04-30 山东星辉液压设备有限公司 一种剪叉式高空作业车用举升电动缸

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CN107143241A (zh) 2017-09-08
CN105952706A (zh) 2016-09-21

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