CN108639969A - A kind of accumulator more changing device - Google Patents

A kind of accumulator more changing device Download PDF

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Publication number
CN108639969A
CN108639969A CN201810811642.8A CN201810811642A CN108639969A CN 108639969 A CN108639969 A CN 108639969A CN 201810811642 A CN201810811642 A CN 201810811642A CN 108639969 A CN108639969 A CN 108639969A
Authority
CN
China
Prior art keywords
accumulator
pedestal
fixture block
torque arm
changing device
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CN201810811642.8A
Other languages
Chinese (zh)
Other versions
CN108639969B (en
Inventor
卢鹏
徐翔
刘姗姗
马永亮
罗希曦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangcha Group Co Ltd
Original Assignee
Hangcha Group Co Ltd
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 Hangcha Group Co Ltd filed Critical Hangcha Group Co Ltd
Priority to CN201810811642.8A priority Critical patent/CN108639969B/en
Publication of CN108639969A publication Critical patent/CN108639969A/en
Application granted granted Critical
Publication of CN108639969B publication Critical patent/CN108639969B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/06Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62Constructional features or details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62Constructional features or details
    • B66C23/82Luffing gear
    • B66C23/821Bracing equipment for booms
    • B66C23/826Bracing equipment acting at an inclined angle to vertical and horizontal directions
    • B66C23/828Bracing equipment acting at an inclined angle to vertical and horizontal directions where the angle is adjustable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075Constructional features or details
    • B66F9/07513Details concerning the chassis
    • B66F9/0754Battery removal arrangements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention discloses a kind of accumulator more changing devices, including:Pedestal, holder, torque arm and fixture block, the side that the lower end of holder is fixed on the base, one end of torque arm is fixed on the upper end of holder, fixture block is slidably connected with torque arm, torque arm is equipped with the driving device that control fixture block moves along its length, and fixture block is used to be clamped with accumulator, and pedestal is for carrying accumulator, and when fixture block drives accumulator movement, the bottom of accumulator can move on pedestal.When dismantling accumulator, the position being clamped with accumulator is moved to by driving device control fixture block to be clamped, then accumulator is gradually moved on pedestal by driving fixture block to opposite reverse movement, stability when by the carrying of pedestal convenient for accumulator movement;It when installing accumulator, drives fixture block that accumulator is driven to be moved on fork truck for installing the position of accumulator by driving device, therefore replaces convenient, and influenced by use environment smaller.

Description

A kind of accumulator more changing device
Technical field
The present invention relates to electri forklift technical fields, more particularly to a kind of accumulator more changing device.
Background technology
The accumulator of electri forklift needs replacing after used a period of time, and there are mainly two types of current substitute modes: One is hoisting types, more demanding to lifting by crane, and need the tools such as crane, cannot meet Most users practical service environment It is required that and lifting appliance lifting when safety it is low;Another kind is side shifting type, it is required that electri forklift has accumulator can be from The vehicle that side moves in and out, but electri forklift accumulator volume is big, weight weight, it is therefore desirable to a kind of auxiliary tool is designed, It is the technical issues of those skilled in the art are badly in need of solving in order to the replacement of accumulator.
Invention content
The object of the present invention is to provide a kind of accumulator more changing devices, can effectively solve accumulator replacement inconvenience etc. and ask Topic.
In order to solve the above technical problems, the present invention provides following technical solutions:
A kind of accumulator more changing device, including:Pedestal, holder, torque arm and fixture block, the lower end of the holder are fixed on described Side on pedestal, one end of the torque arm are fixed on the upper end of the holder, and the fixture block is slidably connected with the torque arm, institute It states torque arm and is equipped with the driving device that the control fixture block moves along its length, the fixture block is used to be clamped with accumulator, The pedestal is used to carry the accumulator, and when the fixture block drives the accumulator movement, the bottom of the accumulator It can move on the base.
Preferably, idler wheel is hinged on the pedestal, the idler wheel is used to contact with the bottom of storage battery and can be with institute It states the movement of accumulator and rolls.
Preferably, the front and rear sides of the pedestal are equipped with the baffle for preventing the accumulator from skidding off.
Preferably, the side far from the holder is equipped with bolt on the pedestal, and the bolt and the pedestal are detachable Connection, for preventing the accumulator from being skidded off from the pedestal.
Preferably, the top of the bolt is equipped with the bending part in predetermined angle bending.
Preferably, the bottom of the pedestal is equipped with the supporting leg for adjusting its height.
Preferably, on the pedestal one end far from the holder be equipped with for and the card slot of forklift frame be mutually clamped Hook.
Preferably, the torque arm is hinged by horizontally disposed articulated shaft with the holder, and the torque arm is equipped with control The carrying handle that the torque arm is rotated around the articulated shaft.
Preferably, the driving device includes leading screw and drives the power plant of the leading screw rotation, the fixture block and institute State threads of lead screw connection.
Preferably, the power plant include dynamic bevel gear, the drive bevel gear engaged with the dynamic bevel gear with And the coaxially connected gear handle with the drive bevel gear, the dynamic bevel gear are fixed on one end of the leading screw.
Compared with prior art, above-mentioned technical proposal has the following advantages:
A kind of accumulator more changing device provided by the present invention, including:Pedestal, holder, torque arm and fixture block, the lower end of holder One end of the side being fixed on the base, torque arm is fixed on the upper end of holder, and fixture block is slidably connected with torque arm, and torque arm is equipped with control The driving device that fabrication block moves along its length, fixture block are used to be clamped with accumulator, pedestal for carrying accumulator, and When fixture block drives accumulator movement, the bottom of accumulator can move on pedestal.When dismantling accumulator, pass through driving device control Fabrication block is moved to the position being clamped with accumulator and is clamped, and then drives fixture block to opposite reverse movement, by accumulator It is gradually moved on pedestal, stability when by the carrying of pedestal convenient for accumulator movement;When installing accumulator, pass through drive Dynamic device driving fixture block drives accumulator to be moved to the position on fork truck for installing accumulator, therefore replacement is convenient, and It is influenced by use environment smaller.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of the present invention or technical solution in the prior art Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is some of the present invention Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these Figure obtains other attached drawings.
Fig. 1 is a kind of a kind of structural schematic diagram for accumulator more changing device that specific implementation mode is provided of the present invention;
Fig. 2 is a kind of a kind of internal structure of the torque arm for accumulator more changing device that specific implementation mode is provided of the present invention Schematic diagram;
Fig. 3 illustrates for a kind of a kind of sectional structure for accumulator more changing device that specific implementation mode is provided of the present invention Figure.
Reference numeral is as follows:
1 is pedestal, and 2 be holder, and 3 be torque arm, and 4 be fixture block, and 5 be idler wheel, and 6 be bolt, and 7 be hook, and 8 be articulated shaft, and 9 are Carrying handle, 10 be cam, and 11 be lock pin, and 12 be leading screw, and 13 be gear handle.
Specific implementation mode
It is understandable in order to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to this hair Bright specific implementation mode is described in detail.
Detail is elaborated in the following description in order to fully understand the present invention.But the present invention can with it is a variety of not Other manner described here is same as to implement, those skilled in the art can do class without violating the connotation of the present invention Like popularization.Therefore the present invention is not limited by following public specific implementation mode.
- Fig. 3 is please referred to Fig.1, Fig. 1 is a kind of a kind of accumulator more changing device that specific implementation mode is provided of the present invention Structural schematic diagram;Fig. 2 is a kind of a kind of inside of the torque arm for accumulator more changing device that specific implementation mode is provided of the present invention Structural schematic diagram;Fig. 3 shows for a kind of a kind of sectional structure for accumulator more changing device that specific implementation mode is provided of the present invention It is intended to.
A kind of specific implementation mode of the present invention provides a kind of accumulator more changing device, including:Pedestal 1, is drawn holder 2 Arm 3 and fixture block 4, the lower end of holder 2 are fixed on the side on pedestal 1, and one end of torque arm 3 is fixed on the upper end of holder 2, fixture block 4 It is slidably connected with torque arm 3, torque arm 3 is equipped with the driving device that control fixture block 4 moves along its length, and fixture block 4 is used for and storage Battery is clamped, and the clamping portion being detachably clamped with fixture block 4 should be equipped on certain accumulator, and pedestal 1 is used to carry accumulator, And when fixture block 4 drives accumulator movement, the bottom of accumulator can move on pedestal 1.
Pass through driving device control fixture block 4 when dismantling accumulator using accumulator provided in this embodiment more changing device It is moved to the position being clamped with accumulator to be clamped, then drives fixture block 4 to opposite reverse movement, accumulator is gradually moved It moves to pedestal 1, stability when by the carrying of pedestal 1 convenient for accumulator movement;When installing accumulator, filled by driving Setting driving fixture block 4 drives accumulator to be moved to the position on fork truck for installing accumulator, therefore replaces conveniently, and is made It is influenced with environment smaller.
It should be noted that the concrete structure of fixture block 4 can be selected according to actual conditions, as long as may be implemented and electric power storage Clamping is realized in clamping portion on pond, related as long as in addition the movement in torque arm 3 of fixture block 4 may be implemented in driving device Its concrete structure can be selected according to actual conditions, this implementation is not specifically limited this.
It is moved on pedestal 1 for the ease of accumulator, in the present embodiment, idler wheel 5 is hinged on pedestal 1, idler wheel 5 is used for It contacts and can be rolled with the movement of accumulator with bottom of storage battery.In addition to the intensity of load of pedestal 1 is improved, pedestal 1 Middle part is equipped with cross bar, and the both sides of cross bar are equipped with multiple idler wheels 5 arranged side by side, and the installation axle and cross bar of each idler wheel 5 are mutual Vertically.
Further, the front and rear sides of pedestal 1 are equipped with the baffle for preventing accumulator from skidding off.It in addition can also ability pedestal 1 Baffle is added in the upper side close to holder 2.
Further, the side far from holder 2 on pedestal 1 is equipped with bolt 6, and bolt 6 is detachably connected with pedestal 1, is used It is skidded off from pedestal 1 in preventing accumulator.It before moving to accumulator on pedestal 1, needs to extract bolt 6, by electric power storage After pond moves on pedestal 1, need, by 6 inserted base 1 of bolt, to play the role of limiting accumulator movement, and then to ensure The safety of accumulator.
Specifically, the top of bolt 6 is equipped with the bending part in predetermined angle bending.Wherein preferably by the top of bolt 6 into Row right angle is bent, and bending place can also further be carried with ensureing the intensity of bolt 6 additionally by bending part equipped with certain radian The position-limiting action of high bolt 6.
Further, the bottom of pedestal 1 is equipped with the supporting leg for adjusting its height.By adjustable supporting leg, can play The effect of leveling, applies also for the accumulator of different height, therefore improves the applicability of more changing device correspondence scene.
In order to improve the stability when replacing accumulator, in the present embodiment, one end far from holder 2 on pedestal 1 is set It is useful for the hook being mutually clamped with the card slot of forklift frame 7.Pedestal 1 and forklift frame can be attached by hook 7, because This can be prevented in mobile accumulator, and situation about being moved relative to forklift frame occurs in pedestal 1.
Further, torque arm 3 and holder 2 are hinged by horizontally disposed articulated shaft 8, torque arm 3 be equipped with control torque arm 3 around The carrying handle 9 that articulated shaft 8 rotates.It, can be first upward around articulated shaft 8 by torque arm 3 when needing to remove accumulator from fork truck It turns an angle, then drives fixture block 4 to be moved to the top of accumulator clamping portion by driving device, then pass through lifting hand Handle 9 controls torque arm 3 and rotates down, until fixture block 4 and clamping portion are clamped, backward negative direction drive 4 movement of fixture block that can will store Battery is removed from fork truck.It is wherein provided with a shaft on holder 2, cam 10, one end of shaft and lifting are fixed in shaft One end of handle 9 is fixedly connected, and the plane for being contacted with cam 10 is additionally provided on holder 2, and holder 2 and torque arm 3, which are equipped with, to supply The through-hole of 11 locking of lock pin, the lock pin 11 are freely rotated for placing torque arm 3, when needing to control the rotation of torque arm 3, first will need Lock pin 11 takes out, and then rotates carrying handle 9, the rotation of torque arm 3 can be realized by cam 10.
Specifically, driving device includes the power plant that leading screw 12 and driving leading screw 12 rotate, fixture block 4 and 12 screw thread of leading screw Connection.It is understood that the driving device includes 12 nut body of leading screw, fixture block 4 is driven to move by the rotation of leading screw 12 It is dynamic.Wherein power plant preferably includes dynamic bevel gear, the drive bevel gear engaged with dynamic bevel gear and and active conical tooth Coaxially connected gear handle 13 is taken turns, dynamic bevel gear is fixed on one end of leading screw 12.It can be driven by rotate gear handle 13 Drive bevel gear rotates and then drives dynamic bevel gear rotation, so that leading screw 12 rotates, fixture block 4 can be along the axis of leading screw 12 It is moved to direction.
It should also be noted that, herein, the terms "include", "comprise" or its any other variant are intended to non- It is exclusive to include, so that the process, method, article or equipment including a series of elements includes not only those elements, But also include other elements that are not explicitly listed, or further include solid by this process, method, article or equipment Some elements.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including There is also other identical elements in the process, method, article or equipment of the element.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.

Claims (10)

1. a kind of accumulator more changing device, which is characterized in that including:Pedestal, holder, torque arm and fixture block, the lower end of the holder Fixed side on the base, one end of the torque arm are fixed on the upper end of the holder, the fixture block and the torque arm Be slidably connected, the torque arm, which is equipped with, controls the driving device that the fixture block moves along its length, the fixture block be used for Accumulator is clamped, and the pedestal is used to carry the accumulator, and when the fixture block drives the accumulator movement, the storage The bottom of battery can move on the base.
2. accumulator according to claim 1 more changing device, which is characterized in that idler wheel is hinged on the pedestal, it is described Idler wheel with the bottom of storage battery for contacting and can be rolled with the movement of the accumulator.
3. accumulator according to claim 2 more changing device, which is characterized in that the front and rear sides of the pedestal are equipped with and are used for The baffle for preventing the accumulator from skidding off.
4. accumulator according to claim 3 more changing device, which is characterized in that the one of the separate holder on the pedestal Side is equipped with bolt, and the bolt is detachably connected with the pedestal, for preventing the accumulator from being skidded off from the pedestal.
5. accumulator according to claim 4 more changing device, which is characterized in that it is in preset angle that the top of the bolt, which is equipped with, Spend the bending part of bending.
6. accumulator according to claim 5 more changing device, which is characterized in that the bottom of the pedestal is equipped with for adjusting The supporting leg of its height.
7. accumulator according to claim 1 more changing device, which is characterized in that the one of the separate holder on the pedestal End is equipped with the hook being mutually clamped for the card slot with forklift frame.
8. accumulator according to claim 1 more changing device, which is characterized in that the torque arm passes through level with the holder The articulated shaft of setting is hinged, and the torque arm, which is equipped with, controls the carrying handle that the torque arm is rotated around the articulated shaft.
9. according to claim 1 to 8 any one of them accumulator more changing device, which is characterized in that the driving device includes Leading screw and the power plant for driving the leading screw rotation, the fixture block are connect with the threads of lead screw.
10. accumulator according to claim 9 more changing device, which is characterized in that the power plant includes by mantle tooth Wheel, the drive bevel gear that is engaged with the dynamic bevel gear and and the coaxially connected gear handle of the drive bevel gear, institute State one end that dynamic bevel gear is fixed on the leading screw.
CN201810811642.8A 2018-07-23 2018-07-23 Storage battery replacement device Active CN108639969B (en)

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Application Number Priority Date Filing Date Title
CN201810811642.8A CN108639969B (en) 2018-07-23 2018-07-23 Storage battery replacement device

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Application Number Priority Date Filing Date Title
CN201810811642.8A CN108639969B (en) 2018-07-23 2018-07-23 Storage battery replacement device

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CN108639969B CN108639969B (en) 2024-01-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110963437A (en) * 2019-12-18 2020-04-07 林华 Transfer device for flat prefabricated parts

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GB0229764D0 (en) * 2002-12-20 2003-01-29 Vitec Group Plc Improvements in or relating to telescopic camera crane arms
CN204150971U (en) * 2014-09-29 2015-02-11 郭潜 A kind of Architectural Equipment lifting device
CN204279380U (en) * 2014-10-31 2015-04-22 浙江中力机械有限公司 The dolly of reach truck storage battery is got for side
CN204775171U (en) * 2015-06-29 2015-11-18 中联重科安徽工业车辆有限公司 Be suitable for battery of battery side -draw formula storage car to transport utensil
CN205256382U (en) * 2015-10-28 2016-05-25 重庆戈林物流有限责任公司 Transport trolley of hand control manipulator loading and unloading
CN105818843A (en) * 2014-08-15 2016-08-03 金华八达集团有限公司新能源汽车服务分公司 Flat battery transfer vehicle
CN205573987U (en) * 2016-02-02 2016-09-14 广州科泓金属制品有限公司 Vacuum heat treatment mould stack pallet
CN206107282U (en) * 2016-08-28 2017-04-19 牛力机械制造有限公司 A small handcart for changing storage battery
CN107140523A (en) * 2017-05-10 2017-09-08 河南新科起重机股份有限公司 Suspension hook and bridge crane
CN107399348A (en) * 2017-08-01 2017-11-28 上汽大众汽车有限公司 A kind of handbarrow of automobile batteries
CN207537028U (en) * 2017-11-27 2018-06-26 南京南瑞继保电气有限公司 A kind of promotion utensil suitable for aerial work platform
CN208429785U (en) * 2018-07-23 2019-01-25 杭叉集团股份有限公司 A kind of battery more changing device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0229764D0 (en) * 2002-12-20 2003-01-29 Vitec Group Plc Improvements in or relating to telescopic camera crane arms
CN105818843A (en) * 2014-08-15 2016-08-03 金华八达集团有限公司新能源汽车服务分公司 Flat battery transfer vehicle
CN204150971U (en) * 2014-09-29 2015-02-11 郭潜 A kind of Architectural Equipment lifting device
CN204279380U (en) * 2014-10-31 2015-04-22 浙江中力机械有限公司 The dolly of reach truck storage battery is got for side
CN204775171U (en) * 2015-06-29 2015-11-18 中联重科安徽工业车辆有限公司 Be suitable for battery of battery side -draw formula storage car to transport utensil
CN205256382U (en) * 2015-10-28 2016-05-25 重庆戈林物流有限责任公司 Transport trolley of hand control manipulator loading and unloading
CN205573987U (en) * 2016-02-02 2016-09-14 广州科泓金属制品有限公司 Vacuum heat treatment mould stack pallet
CN206107282U (en) * 2016-08-28 2017-04-19 牛力机械制造有限公司 A small handcart for changing storage battery
CN107140523A (en) * 2017-05-10 2017-09-08 河南新科起重机股份有限公司 Suspension hook and bridge crane
CN107399348A (en) * 2017-08-01 2017-11-28 上汽大众汽车有限公司 A kind of handbarrow of automobile batteries
CN207537028U (en) * 2017-11-27 2018-06-26 南京南瑞继保电气有限公司 A kind of promotion utensil suitable for aerial work platform
CN208429785U (en) * 2018-07-23 2019-01-25 杭叉集团股份有限公司 A kind of battery more changing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110963437A (en) * 2019-12-18 2020-04-07 林华 Transfer device for flat prefabricated parts
CN110963437B (en) * 2019-12-18 2021-04-02 林华 Transfer device for flat prefabricated parts

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