CN110203827B - Power supply device of crane - Google Patents
Power supply device of crane Download PDFInfo
- Publication number
- CN110203827B CN110203827B CN201910597381.9A CN201910597381A CN110203827B CN 110203827 B CN110203827 B CN 110203827B CN 201910597381 A CN201910597381 A CN 201910597381A CN 110203827 B CN110203827 B CN 110203827B
- Authority
- CN
- China
- Prior art keywords
- sliding contact
- connector box
- sub
- contact line
- sliding
- 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.)
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Links
- 244000161999 Acacia greggii Species 0.000 claims description 10
- 235000004608 catclaw acacia Nutrition 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Leg Units, Guards, And Driving Tracks Of Cranes (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
A crane power supply apparatus comprising: the sliding contact line is used for sliding contact with a current collecting sliding block to be supplied with power; the first connector box, both ends respectively with the difference the wiping line is connected, include: the first sub-connector box is connected with one end of one sliding contact line; the second sub-connector box is connected with the other sliding contact line, and a certain distance is reserved between the two sliding contact lines; and one end of the connecting wire is connected with the first sub-connector box, and the other end of the connecting wire is connected with the second sub-connector box. When the sliding contact wire is used, two adjacent sliding contact wires are connected through the first connector box, one sliding contact wire is connected with the first sub connector box, the other sliding contact wire is connected with the second sub connector box, a certain interval is reserved during connection, the interval can enable the current collecting sliding block to pass through, when the sliding contact wires are heated and expanded, the two sliding contact wires are contacted together, the joint looseness caused by thermal expansion and deformation of the sliding contact wires are avoided, and good protection is formed for the sliding rail and the sliding contact wires.
Description
Technical Field
The invention relates to a lifting power supply device, in particular to a crane power supply device.
Background
At present, a general crane trolley wire provides a three-phase four-wire alternating current power supply for a crane, the length of the three-phase four-wire alternating current power supply is hundreds of meters or even hundreds of meters, the three-phase four-wire alternating current power supply is formed by connecting a plurality of or tens of single trolley wires with the length of a few meters, a current collector runs back and forth in a current collecting slideway, the single trolley wires with the length of a few meters are tightly connected together to form a power supply line with the length of hundreds of meters, however, the joint of the trolley wires is loosened and deformed due to expansion and contraction of the trolley wires, and normal power supply to the crane cannot be performed.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a crane power supply device capable of avoiding loosening at a trolley wire joint.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
a power supply device of a crane for travelling, comprising the following steps:
the sliding contact line is used for sliding contact with a current collecting sliding block to be supplied with power;
the first connector box, both ends respectively with the difference the wiping line is connected, include:
the first sub-connector box is connected with one end of one sliding contact line;
the second sub-connector box is connected with the other sliding contact line, and a certain distance is reserved between the two sliding contact lines;
and one end of the connecting wire is connected with the first sub-connector box, and the other end of the connecting wire is connected with the second sub-connector box.
The invention relates to a crane power supply device, wherein the trolley wire comprises:
the sliding contact line body, sliding groove has on sliding contact line body upper portion, the sliding groove is the shape of falling T, and the upper end runs through sliding contact line body, sliding contact line body lower part has a current collecting chute, current collecting chute is followed sliding contact line body length direction runs through sliding contact line body for the current collecting slider slides therein.
The invention relates to a crane power supply device, wherein the trolley wire comprises:
one end of the fixed cat claw is arranged on the sliding groove, the other end of the fixed cat claw extends out of the sliding groove, and the lower part of the other end of the fixed cat claw is connected with a clamping block;
the fixed groove A is arranged at the bottom of the sliding groove and is positioned at one end of the sliding groove, which is away from the fixed cat claw.
The invention discloses a crane power supply device, wherein a first fixing groove matched with a trolley wire is formed in the bottom of a first sub-connector box, and a trolley wire body is arranged in the first fixing groove and connected with the first sub-connector box.
The crane power supply device comprises a crane body, a first sub-connector box, a first sliding contact wire body, a second sliding contact wire body, a first fixing groove, a second fixing groove, a first fixing groove and a second fixing groove, wherein the first fixing groove is matched with the sliding contact wire, and the sliding contact wire body is arranged in the first fixing groove and connected with the first sub-connector box.
The invention relates to a crane power supply device, which further comprises:
the bottom of the second connector box is provided with a fixing groove B matched with the sliding contact line, the top of the fixing groove B is provided with a fixing hole matched with the top of the sliding groove, and the second connector box and the first connector box are alternately connected with the sliding contact line.
The invention relates to a crane power supply device, which further comprises:
the insulation plates are arranged at two ends of the sliding contact wire mechanism formed by connecting the sliding contact wire with the first connector box;
and the fixing plate is arranged outside the insulating plate and fixedly connected with the insulating plate and used for being connected with the side wall of the working space.
The invention relates to a crane power supply device, which further comprises:
the copper electric guide rail is arranged at the top of the current collecting chute and is arranged along the length direction of the current collecting chute.
The crane power supply device provided by the invention is characterized in that the top of the first sub-connector box is provided with the second fixing hole.
The crane power supply device provided by the invention has the advantages that the top of the second sub-connector box is provided with the third fixing hole.
In contrast to the prior art, the method has the advantages that, the beneficial effects of the invention are as follows:
in the use process of the invention, when a plurality of sliding contact wires are connected together in use, two adjacent sliding contact wires are connected through the first connector box, one sliding contact wire is connected with the first sub connector box, the other sliding contact wire is connected with the second sub connector box, a certain interval is reserved in connection, the interval can enable the current collecting sliding block to pass through, the interval can be generally set to be 1mm-10mm, and the sliding contact wires expand when the temperature rises due to a certain reserved gap, so that the two sliding contact wires are contacted together, the joint looseness caused by thermal expansion and the deformation of the sliding contact wires can not be caused, and good protection is formed on the sliding rail and the sliding contact wires.
Drawings
FIG. 1 is a view of the invention in its full use;
FIG. 2 is a top view of the present invention in use;
FIG. 3 is a first closure view of the present invention;
FIG. 4 is a side view of a trolley line according to the present invention;
FIG. 5 is a cross-sectional view of a trolley line according to the present invention;
FIG. 6 is a second closure view of the present invention;
Detailed Description
1-3, it should be understood by those skilled in the art that, in the present disclosure, the terms "upper," "lower," and the like are used for convenience in describing the present invention and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus the above terms should not be construed as limiting the present invention.
It should be noted that, the common trolley wire of the crane provides a three-phase four-wire ac power supply for the crane, the length is hundreds of meters or even hundreds of meters, the trolley wire is formed by connecting a plurality of or tens of single trolley wires with a length of several meters, the current collector runs back and forth in the current collecting slideway, the single trolley wires with a length of several meters are tightly connected together to form a power supply line with a length of hundreds of meters, however, the joint of the trolley wire is loosened and deformed due to expansion and contraction of the trolley wire, so that the crane cannot be normally powered, and the trolley wire can be made of conductive materials such as aluminum alloy.
Based on this, the present embodiment provides a crane power supply device, including:
a trolley line 100 for sliding contact with a current collecting slider to be supplied with power;
the first connector box 200, two ends are connected with different trolley wires 100 respectively, includes:
the first sub-connector box 210 is connected with one end of one sliding contact line 100;
the second sub-connector 220 is connected with the other sliding contact line 100, and a certain distance is reserved between the two sliding contact lines 100;
and a connection wire 230 having one end connected to the first sub-junction box 210 and the other end connected to the second sub-junction box 220.
When the embodiment is used, when a plurality of sliding contact wires are connected together, two adjacent sliding contact wires 100 are connected through a first connector box, one sliding contact wire 100 is connected with a first sub-connector box 210, the other sliding contact wire 100 is connected with a second sub-connector box 220, a certain interval is reserved when the sliding contact wires are connected, the interval can enable a current collecting sliding block to pass through, and can be generally set to be 1mm-10mm, and as a certain gap is reserved when the temperature rises, the sliding contact wires expand, the two sliding contact wires are contacted together, so that the joint looseness caused by thermal expansion and the deformation of the sliding contact wires can not be caused, good protection is formed on a sliding rail and the sliding contact wires, the existing connection mode adopts one connector box, and two ends of the sliding contact wires are connected with different sliding contact wires, and the whole sliding contact wire can deform due to the fact that the joint and the sliding contact wires do not have elasticity and the elasticity are heated and expansion;
it should be noted that, the material of the connection wire 230 may be a wire strip or a copper strip with a certain elasticity, and the connection wire 230 may be stretched with a certain elasticity during thermal expansion, so as to avoid direct contact deformation of the two sliding wires 100, and further, when the connection wire 230 is connected to the first sub-connector box 210 and the second sub-connector box 220, it may be connected by welding or by bolts.
When the device is actually used, the device is needed to be suspended in a working space, the device is suspended by the lifting hook at the top of the working space, the trolley wire is powered by an external power supply, and the trolley wire is powered by the crane through the current collecting sliding block.
The trolley line 100 provided in this embodiment includes:
the sliding contact line body 110, the sliding groove 111 is provided at the upper part of the sliding contact line body 110, the sliding groove 111 is in an inverted T shape, the upper end penetrates through the sliding contact line body 110, the lower part of the sliding contact line body 110 is provided with a current collecting sliding groove 112, and the current collecting sliding groove 112 penetrates through the sliding contact line body 110 along the length direction of the sliding contact line body 110 for the current collecting sliding block to slide therein.
Through the inverted T-shaped sliding groove, the sliding contact line 100 and the article to be fixed can be fixed through the fixing piece when needed, for example, the first sub-connector box and the second sub-connector box are used for describing that the current collecting sliding groove 112 corresponds to the current collecting sliding block, the specific shape is determined according to the need, for example, if the current collecting sliding block is in a T shape, the current collecting sliding groove 112 can be in an inverted T shape and is matched with the current collecting sliding block;
the exemplary embodiment may further include a copper conductive rail 113 disposed on top of the current collecting chute 112, along the length direction of the current collecting chute 112, for electrically conductive connection with the current collecting slider 600, for electrical conduction.
The first sub-connector box 210 is provided with a first fixing groove 211 matched with the trolley wire 100 at the bottom, the trolley wire body 110 is arranged in the first fixing groove 211 and connected with the first sub-connector box 210, a fixing hole matched with the sliding groove 111 is further formed at the top of the first fixing groove 211, the first sub-connector box 210 is connected with the trolley wire body 110 through the fixing hole and a screw, a pin shaft hole can be formed above the screw for fixing the first sub-connector box, a pin shaft can be placed in the pin shaft hole if necessary, loosening of the screw 114 is avoided, the first sub-connector box 210 is connected with the trolley wire 100, the top of the first sub-connector box 210 is provided with a second fixing hole 212, and the first sub-connector box 210 is connected with the trolley wire body 110 through the second fixing hole 212, the sliding groove 111 and the screw;
the second sub-connector box 220 is provided with a second fixing groove 221 matched with the sliding contact wire 100 at the bottom, the sliding contact wire body 110 is arranged in the second fixing groove 221 and is connected with the second sub-connector box 220, a fixing hole matched with the sliding groove 111 is further formed at the top of the second fixing groove 221, the second sub-connector box 220 is connected with the sliding contact wire body 110 through the fixing hole and the screw 114, a pin shaft hole can be formed above the screw for fixing the sliding contact wire body 110 more firmly, a pin shaft can be placed in the pin shaft hole if necessary, loosening of the screw 114 is avoided, and the connection between the second sub-connector box 220 and the sliding contact wire 100 is realized in the above embodiment; the top of the second sub-connector 220 has a third fixing hole 222, and the second sub-connector 220 is used for connecting the second sub-connector 220 with the trolley line body 110 through the third fixing hole 222, the sliding groove 111 and the screw.
Illustratively, the trolley line 100 includes:
a fixed cat claw 120, one end of which is arranged on the sliding groove 111, the other end of which extends out of the sliding groove 111, and the lower part of the other end of which is connected with a clamping block 121;
the fixed slot a130 is disposed at the bottom of the sliding slot 111, and is located at one end of the sliding slot 111 facing away from the fixed cat claw 120.
It should be noted that, when two trolley wires are connected through the first connector box 200, because the two trolley wires are not concentric or the two trolley wires are not concentric due to the expansion and contraction effect due to the installation of workers in the fixing process, the clamping blocks 121 on the fixing cat claw 120 are clamped in the fixing groove A130 of another trolley wire, and the whole concentricity of the trolley wires is reinforced and maintained through the clamping structure and meanwhile the movement is prevented.
The crane power supply device provided in this embodiment further includes:
the bottom of the second connector box 300 is provided with a fixing groove B310 matched with the sliding contact line 100, the top of the fixing groove B310 is provided with a fixing hole 311 matched with the top of the sliding groove, and the second connector box 300 and the first connector box 200 are alternately connected with the sliding contact line.
It should be noted that, when the sliding contact wire 100 is connected only by using the first connector box connection 200, the presence of the connection wire 230 may result in the whole device being softer and increase the cost of the whole device, because the requirement of the connection wire is higher, and the cost of the connection wire is higher;
for this reason, the second connector box 300 is provided, and the second connector box and the first connector box 200 are used alternately, and it should be noted that, the use of the second connector box in an alternative manner means that the second connector box 300 is used according to the requirement after the first connector box is used for a distance, so that the proportion of the second connector box 300 to the first connector box 200 is not limited, and further the cost is saved, and when the second connector box 300 is connected with the trolley line 100, the fixing hole 311, the sliding groove and the bolt are connected, and the fixing hole can be matched with the bolt by adopting a screw hole.
The crane power supply device provided in this embodiment further includes:
the insulating plates 400 are arranged at two ends of the trolley wire mechanism formed by connecting the trolley wire 100 and the first connector box 200;
the fixed plate 500 is arranged outside the insulating plate 400 and fixedly connected with the insulating plate 400, and the fixed plate 500 is used for being connected with the side wall of the working space.
At present, a power supply line formed by connecting a plurality of or dozens of trolley lines is fixed by dropping the device on the top of a working space through a hanging rod, and when the method is adopted, the power supply line is lifted by only adopting the hanging rod, so that the power supply line can shake.
For this reason, be connected through insulation board 400 and wiping line mechanism both ends, namely the power supply line both ends that tens of wiping lines connect into are connected, and specific connection can pass through bolt screw connection, one way that provides is, the wiping line both ends welding fixation nut with both ends, be connected insulation board 400 and wiping line both ends through nut and screw, further fixed plate and insulation board 400 also can pass through screw fixed connection, afterwards fix the fixed plate on the workspace lateral wall, through the fixed at both ends, can be fixed the power supply line both ends, avoid rocking and the drunkenness of power supply line.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. A crane power supply device, comprising: a trolley wire (100), a first connector box (200), a second connector box (300), wherein:
the sliding contact line (100) is used for being in sliding contact with a current collecting sliding block to be supplied with power;
the trolley wire (100) includes: a sliding contact line body (110), a fixed cat claw (120) and a fixed groove A (130),
the sliding contact line comprises a sliding contact line body (110), wherein a sliding groove (111) is formed in the upper portion of the sliding contact line body (110), the sliding groove (111) is in an inverted T shape, the upper end of the sliding groove penetrates through the sliding contact line body (110), a current collecting sliding groove (112) is formed in the lower portion of the sliding contact line body (110), and the current collecting sliding groove (112) penetrates through the sliding contact line body (110) along the length direction of the sliding contact line body (110) and is used for enabling a current collecting sliding block to slide in the current collecting sliding groove;
a fixed cat claw (120), one end of which is arranged on the sliding groove (111), the other end of which extends out of the sliding groove (111), and the lower part of the other end of which is connected with a clamping block (121);
the fixed groove A (130) is arranged at the bottom of the sliding groove (111) and is positioned at one end of the sliding groove (111) which is away from the fixed cat claw (120);
first connector box (200), both ends respectively with the difference slide wire (100) are connected, include: a first sub-connector (210), a second sub-connector (220), and a connecting wire (230),
the first sub-connector box (210) is connected with one end of one sliding contact line (100); a first fixing groove (211) matched with the sliding contact line (100) is formed in the bottom of the first sub-connector box (210), and the sliding contact line body (110) is arranged in the first fixing groove (211) and connected with the first sub-connector box (210);
the second sub-connector box (220) is connected with the other sliding contact line (100), and a certain distance is reserved between the two sliding contact lines (100); a second fixing groove (221) matched with the sliding contact line (100) is formed in the bottom of the second sub-connector box (220), and the sliding contact line body (110) is arranged in the second fixing groove (221) and is connected with the second sub-connector box (220);
a connecting wire (230) having one end connected to the first sub-junction box (210) and the other end connected to the second sub-junction box (220); the connecting wires (230) are made of steel wire plate belts or copper wire plate belts;
the second connector box (300) is provided with a fixing groove B (310) matched with the sliding contact line (100) at the bottom, a fixing hole (311) matched with the top of the sliding groove is formed in the top of the fixing groove B (310), and the second connector box (300) and the first connector box (200) are alternately connected with the sliding contact line.
2. The crane power supply of claim 1, further comprising:
the insulation plates (400) are arranged at two ends of a sliding contact line mechanism formed by connecting the sliding contact line (100) with the first connector box (200);
and the fixing plate (500) is arranged outside the insulating plate (400) and fixedly connected with the insulating plate (400) and is used for being connected with the side wall of the working space.
3. The crane power supply of claim 1, further comprising:
and the copper electric guide rail (113) is arranged at the top of the current collecting chute (112) and is arranged along the length direction of the current collecting chute (112).
4. Crane power supply according to claim 1, characterized in that the top of the first sub-connector box (210) is provided with a second fixing hole (212).
5. Crane power unit according to claim 1, characterized in that the second sub-junction box (220) has a third fixing hole (222) at the top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910597381.9A CN110203827B (en) | 2019-07-04 | 2019-07-04 | Power supply device of crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910597381.9A CN110203827B (en) | 2019-07-04 | 2019-07-04 | Power supply device of crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110203827A CN110203827A (en) | 2019-09-06 |
| CN110203827B true CN110203827B (en) | 2024-04-09 |
Family
ID=67796227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910597381.9A Active CN110203827B (en) | 2019-07-04 | 2019-07-04 | Power supply device of crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110203827B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07315761A (en) * | 1994-05-23 | 1995-12-05 | Kato Works Co Ltd | Oil supply device in telescopic boom |
| JPH11278788A (en) * | 1998-03-27 | 1999-10-12 | Kawasaki Steel Corp | Insulating trolley |
| JP2006111410A (en) * | 2004-10-15 | 2006-04-27 | Asyst Shinko Inc | Carried material lifting mechanism in carriage for suspension type lifting and conveying device |
| JP2009242101A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Eng & Shipbuild Co Ltd | Feeder device for yard crane |
| CN201907931U (en) * | 2010-11-22 | 2011-07-27 | 中国一冶集团有限公司 | Sliding contact line guiding device |
| EP2799277A2 (en) * | 2013-05-03 | 2014-11-05 | Heinrich GmbH | Current rail and current rail system |
| CN106116732A (en) * | 2016-06-13 | 2016-11-16 | 中科润隆（北京）农业技术有限公司 | The slipping contact wire device of slot type turner and slot type turner |
| CN106744317A (en) * | 2017-01-13 | 2017-05-31 | 上海振华港机（集团）宁波传动机械有限公司 | A kind of bell guide for lower frame trolley |
| KR101783754B1 (en) * | 2017-03-22 | 2017-10-10 | (주)홍주산업 | Structure of cable-trench for crane type of exposed to the ground |
| CN109132894A (en) * | 2018-10-22 | 2019-01-04 | 徐州重型机械有限公司 | Lifting equipment |
| CN210594954U (en) * | 2019-07-04 | 2020-05-22 | 安徽国祯生态科技有限公司 | Power supply device for crane |
-
2019
- 2019-07-04 CN CN201910597381.9A patent/CN110203827B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07315761A (en) * | 1994-05-23 | 1995-12-05 | Kato Works Co Ltd | Oil supply device in telescopic boom |
| JPH11278788A (en) * | 1998-03-27 | 1999-10-12 | Kawasaki Steel Corp | Insulating trolley |
| JP2006111410A (en) * | 2004-10-15 | 2006-04-27 | Asyst Shinko Inc | Carried material lifting mechanism in carriage for suspension type lifting and conveying device |
| JP2009242101A (en) * | 2008-03-31 | 2009-10-22 | Mitsui Eng & Shipbuild Co Ltd | Feeder device for yard crane |
| CN201907931U (en) * | 2010-11-22 | 2011-07-27 | 中国一冶集团有限公司 | Sliding contact line guiding device |
| EP2799277A2 (en) * | 2013-05-03 | 2014-11-05 | Heinrich GmbH | Current rail and current rail system |
| CN106116732A (en) * | 2016-06-13 | 2016-11-16 | 中科润隆（北京）农业技术有限公司 | The slipping contact wire device of slot type turner and slot type turner |
| CN106744317A (en) * | 2017-01-13 | 2017-05-31 | 上海振华港机（集团）宁波传动机械有限公司 | A kind of bell guide for lower frame trolley |
| KR101783754B1 (en) * | 2017-03-22 | 2017-10-10 | (주)홍주산업 | Structure of cable-trench for crane type of exposed to the ground |
| CN109132894A (en) * | 2018-10-22 | 2019-01-04 | 徐州重型机械有限公司 | Lifting equipment |
| CN210594954U (en) * | 2019-07-04 | 2020-05-22 | 安徽国祯生态科技有限公司 | Power supply device for crane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110203827A (en) | 2019-09-06 |
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