CN111998046B - Chain anti-drop device and tilting system - Google Patents
Chain anti-drop device and tilting system Download PDFInfo
- Publication number
- CN111998046B CN111998046B CN202010962434.5A CN202010962434A CN111998046B CN 111998046 B CN111998046 B CN 111998046B CN 202010962434 A CN202010962434 A CN 202010962434A CN 111998046 B CN111998046 B CN 111998046B
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- Prior art keywords
- chain
- sprocket
- gear
- transition gear
- retainer
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- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 230000000712 assembly Effects 0.000 claims abstract description 8
- 238000000429 assembly Methods 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 33
- 230000007306 turnover Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims 4
- 238000004804 winding Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/18—Means for guiding or supporting belts, ropes, or chains
-
- 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
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention provides a chain anti-drop device which is arranged on a chain transmission mechanism; comprising the following steps: the chain wheel assembly is symmetrically arranged on the retainer; the retainer is rotatably connected with a gear of the chain transmission mechanism; both sprocket assemblies include: sprocket shafts and sprockets; the chain wheel shaft is rotatably connected with the retainer; the sprocket is fixed on two sprocket shafts, and two sprockets are located on one side of the retainer. The chain winding device has the advantages that the number of the sections of the chain winding device is always equal to the number of the sections of the chain winding device, the chain is always tightly attached to the transmission gear, and even if the upper chain is completely loosened, the chain cannot be separated from the device, so that safe and reliable transmission of chain transmission is realized.
Description
Technical Field
The invention relates to a chain anti-drop device and a turnover system.
Background
The traditional chain anti-drop is usually guaranteed in a chain tensioning mode, the center distance between the driving sprocket and the driven sprocket is fixed only, and a tensioning device is arranged for preventing the chain from falling off or facilitating installation, so that the chain always follows a closed curve and is tangent to a pitch circle of the sprocket. However, for the situation that the center distance changes with time, the elastic tension of the springs is usually increased on the basis of the original tension. However, for the working conditions that the center distance is greatly changed or the driven sprocket has swing or bounce, especially for the occasion that the driven sprocket cannot be fixed, namely, when the center distance between the driving sprocket and the driven sprocket is changed at any time due to movement or bounce, the conventional tensioning mode cannot realize tensioning and anti-drop requirements.
Disclosure of Invention
The chain anti-drop device provided by the invention ensures that the number of the sections of the chain winding device is always equal to the number of the sections of the chain winding device, the chain is always tightly attached to the transmission gear, and even if the upper chain is completely loosened, the chain cannot be pulled out of the device, so that safe and reliable transmission of chain transmission is realized; to overcome the disadvantages of the prior art.
The invention provides a chain anti-drop device which is arranged on a chain transmission mechanism; comprising the following steps: a cage 551 and two symmetrically disposed sprocket assemblies 552; the retainer 551 is rotatably connected with a gear of the chain transmission mechanism; both sprocket assemblies 552 include: sprocket shaft 552a and sprocket 552b; the sprocket shaft 552a is rotatably connected to the holder 551; the sprocket 552b is fixed to two sprocket shafts 552a, and the two sprockets 552b are located on one side of the holder 551.
Further, the present invention provides a chain anti-drop device, which may further have the following features: the chain of the chain drive is meshed with one sprocket 552b, then with the gears of the chain drive, and then with the other sprocket 552 b.
Further, the present invention provides a chain anti-drop device, which may further have the following features: the distance between the two sprockets 552b and the engagement position of the chain 52 is equal to the distance between the two sides of the magnet flipping driven wheel 54 and the engagement position of the chain 52.
Further, the present invention provides a chain anti-drop device, which may further have the following features: also included is a transition gear assembly 553; both ends of the sprocket shaft 552a penetrate both sides of the holder 551; the transition gear assembly 553 includes: a transition gear shaft 553a and a transition gear 553b; the transition gear shaft 553a is rotatably connected with the retainer 551; the transition gear 553b is fixed on the transition gear shaft 553 a; the two sprocket assemblies 552 further include a synchronizing gear 552c; the synchronizing gear 552c is fixedly connected with the sprocket shaft 552 a; a transition gear shaft 553a and two synchronizing gears 552c are positioned at the other side of the holder 551; the transition gear shaft 553a is located intermediate the two synchronizing gears 552c and meshes with the two synchronizing gears 552c, respectively.
Further, the present invention provides a chain anti-drop device, which may further have the following features: the transition gear 553b and the synchronizing gear 552c have the same number of teeth and modulus.
Further, the present invention provides a chain anti-drop device, which may further have the following features: sprocket assembly 552 further includes two chain limiting portions 554; the limiting plates 554a are fixed at two ends of the retainer 551; two stop plates 554a are adjacent to the circumferences of the two sprockets 552b, respectively.
Further, the present invention provides a chain anti-drop device, which may further have the following features: the chain stopper 554 further includes a fixing plate 554b; the limiting plate 554a and the fixing plate 554b are perpendicular to each other and are L-shaped; one end of the two sprocket shafts 552a also pass through the fixed plate 554b and are rotatably connected to the fixed plate 554 b.
Further, the present invention provides a chain anti-drop device, which may further have the following features: the chain of the chain drive passes between one sprocket 552b and a stop plate 554 a.
In addition, the present invention provides a flipping system comprising: the chain anti-falling device comprises two chain transmission mechanisms, two chain anti-falling devices and a turnover piece; the two chain transmission mechanisms and the two chain anti-falling devices are symmetrically arranged on two sides of the turnover piece; the chain drive comprises a gear and a chain 52; both sides of the turnover piece are fixed on the two gears; the two chains 52 are engaged with one sprocket 552b of the side, then with a gear, and then with the other sprocket 552b of the side, respectively.
Further, the present invention provides a flipping system, which may also have the following features: the flip is an electromagnet 56.
Drawings
Fig. 1 is a schematic structural view of a special rotary overturning lifting appliance for sectional materials in an embodiment.
Fig. 2 is a schematic structural diagram of a flipping electromagnet system in an embodiment.
Fig. 3 is a side perspective view of a special rotary flip spreader for profiles in an embodiment.
Fig. 4 is another side perspective view of the special rotary flip spreader for profiles in the embodiment.
FIG. 5 is an exploded view of the sprocket assembly in an embodiment.
FIG. 6 is an exploded view of the transition gear assembly in an embodiment.
Fig. 7 is a schematic structural view of a rotating device and an upper hanger in the embodiment.
Fig. 8 is a schematic structural view of a rotating device and an intermediate hanger in an embodiment.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
Examples
The special rotatory upset hoist of section bar in this embodiment includes: the device comprises an upper hanging frame 1, a rotating device 2, a middle hanging frame 3, a lower hanging frame 4 and a plurality of overturning electromagnet systems 5.
In this embodiment, the central position of the upper hanger 1 is provided with a cable guide frame 11, and when the hanging length of the power supply cable of the hanger is changed, the power supply cable is retracted or placed in the cable guide frame 11 according to a fixed direction. The power supply cable is connected to the junction box of the upper hanging frame 1, and the power supply cable is led out from the junction box to supply electric energy for the rotating device 2 and the overturning electromagnet system 5. The upper hanging frame 1 is also provided with 4 groups of pulleys 12, and the 4 groups of pulleys 12 are distributed in square or rectangle by taking the central position of the upper hanging frame 1 as the center. The gear opening size of the pulley 12 matches the layout of the travelling crane. The whole lifting appliance is connected with the crane through a steel wire rope wound on the pulley 12, and can be driven to ascend and descend.
The rotating device 2 in the present embodiment includes: the two rotary drives 21, the two slewing drive pinions are shielded by the upper pylon and the external toothed slewing bearing 23. The rotation driving device 21 can adopt a motor-driven vertical reduction gearbox, and is symmetrically fixed on two sides of the upper hanging frame 1, and two rotation driving pinions are respectively fixed on output shafts of the two rotation driving devices 21. The inner ring 23a of the external-tooth type slewing bearing 23 is fixedly connected with the upper hanger 1 through a high-strength bolt, and the outer ring 23b of the external-tooth type slewing bearing 23 is fixedly connected with the middle hanger 3 through a high-strength bolt. The inner ring 23a and the outer ring 23b of the external slewing bearing 23 are sleeved together by balls. The rotary drive 21 drives the rotary drive, and then drives the outer gear ring 23b of the outer gear type rotary support 23 to rotate, so as to drive the intermediate hanger 3 to perform rotary motion; the rotation between the upper hanging frame 1 and the middle hanging frame 3 is realized.
The upper end of the lower hanging frame 4 is fixedly connected with the middle hanging frame 3 by adopting a pin. In this embodiment, the lower hanger 4 is a truss girder structure, and is formed by riveting or welding a section steel and a steel plate.
A plurality of overturning electromagnet systems 5 are arranged below the lower hanging frame 4. Each flipping electromagnet system 5 comprises: two magnet upset action wheels 51, two chains 52, two magnet upset driven wheels 54 and electro-magnet 56.
The two magnet turning driving wheels 51, the two chains 52, the two magnet turning driven wheels 54 and the two chain anti-falling devices 55 are symmetrically arranged on two sides of the electromagnet 56.
The two chains 52 are respectively sleeved on the magnet overturning driving wheel 51 and the two magnet overturning driven wheels 54 on the corresponding sides and are respectively meshed with the two magnets overturning driving wheels and the two magnet overturning driven wheels. Two ends of the electromagnet 56 are fixedly connected with the two magnet overturning driven wheels 54 respectively, and can overturn along with the rotation of the magnet overturning driven wheels 54. The cross-section of electromagnet 56 may be any polygonal shape.
In this embodiment, the flipping electromagnet system 5 has a unified drive 57 and drive shaft 58. The driving device 57 is fixed on the lower hanging frame 4, the transmission shaft 58 is rotatably connected with the lower hanging frame 4, and the driving device 57 drives the transmission shaft 58 to rotate. All the magnet turning driving wheels 51 are fixed on the transmission shaft 58 to rotate therewith. Since the drive shaft 58 is relatively long, a support bearing may be provided for the drive shaft 58 at the location where the magnet turning drive wheel 51 is located. Of course, the flipping electromagnet system 5 may also be separately provided with a power drive to respectively drive the magnet flipping driving wheels 51 to rotate.
In this embodiment, the flipping electromagnet system 5 further includes two chain anti-slip devices 55. The chain escape prevention device 55 includes: a cage 551, two sprocket assemblies 552, a transition gear assembly 553, and two chain stops 554. The entire chain drop prevention device 55 is symmetrical with the axis of the magnet flip driven wheel 54 as the center.
The lower end of the retainer 551 is annular and is sleeved on the shaft of the magnet overturning driven wheel 54, and the retainer 551 and the shaft can rotate relatively.
Sprocket assembly 552 basically includes: sprocket shaft 552a, sprocket 552b, and synchronizing gear 552c.
Both ends of the sprocket shaft 552a penetrate both sides of the holder 551 and are rotatably connected to the holder 551. The sprocket 552b is fixed to one end of the sprocket shaft 552a by a key 552d and a snap spring 552 e. The synchronizing gear 552c is fixed to the other end of the sprocket shaft 552a by a key 552f and a snap spring 552 g. In this embodiment, the distance between the two sprockets 552b and the engaging position of the chain 52 is equal to the distance between the two sides of the magnet turning driven wheel 54 and the engaging position of the chain 52, so that the chain 52 vertically enters and exits the magnet turning driven wheel 54, thereby ensuring smooth and unimpeded chain transmission.
In the present embodiment, the sprocket 552b and the synchronizing gear 552c are located on both sides of the holder 551, respectively. Of course, the sprocket 552b and the synchronizing gear 552c are located on the same side of the cage 551 to perform the same function.
In this embodiment, the two chain stopper 554 include: the limiting plate 554a and the fixing plate 554b are perpendicular to each other, and are L-shaped. The stopper plates 554a are fixed to both ends of the holder 551. Two stop plates 554a are adjacent to the circumferences of the two sprockets 552b, respectively. One end of each of the two sprocket shafts 552a is further threaded and engages the nut 552h after passing through the fixing plate 554 b. A spacer 552i is further provided between the sprocket 552b and the fixing plate 554b to ensure smooth relative rotation between the sprocket shaft 552a and the fixing plate 554 b. Of course, the fixing plates 554b may be connected together as a unit.
The transition gear assembly 553 basically includes: a transition gear shaft 553a and a transition gear 553b. After the transitional gear shaft 553a passes through the retainer 551, a rotatable connection with the retainer 551 is achieved by means of a snap spring 553 c. The transition gear 553b is fixed to the transition gear shaft 553a by a key 553d and a snap spring 553 e. The transition gear 553b is located intermediate the two synchronizing gears 552c and meshes with the two synchronizing gears 552c, respectively. In this embodiment, the transition gear 553b and the synchronizing gear 552c have the same number of teeth and modulus.
One side chain 52 passes between one sprocket 552b and a stop plate 554a of the side, and the sprocket 552b engages with the magnet reversing driven wheel 54 of the side, and passes between the other sprocket 552b and the stop plate 554a of the side, and the sprocket 552b engages with the magnet reversing driving wheel 51 of the side. The two sprockets 552b are located outside the holder 551, the inside of the holder 551 is a transition gear 553b and a synchronizing gear 552c engaged with the transition gear 553b, wherein the sprockets 552b and the synchronizing gear 552c on the same sprocket assembly 552 rotate synchronously, so that when one sprocket 552b is rotated by the chain belt, the sprocket shaft 552a and the synchronizing gear 552c are driven to rotate synchronously by the rigidity, the synchronizing gear 552c engages with and drives the transition gear 553b, the transition gear 553b engages with and drives the synchronizing gear 552c on the other side, the synchronizing gear 552c rigidly drives the sprocket shaft 552a and the sprocket 552b to rotate, and when the sprocket 552b on one side winds into a plurality of racks, the sprocket 552b on the other side winds out the racks with the same number of racks. The side sprockets 552b are turned over by the magnets on the driven wheel 54 side to form a closed and constant length chain that ensures that the portion of the chain does not come loose.
Generally, the center of the driving wheel is relatively fixed, and the position of the driven wheel may be changed according to needs in some cases, so it is common that the chain anti-drop device 55 is disposed at the position of the driven wheel. If these are very specific structures, the driving wheel may also be located with a chain anti-drop device 55.
The working process of the special rotary overturning lifting appliance for the section bar comprises the following steps:
the special rotary overturning lifting appliance for the sectional materials is in an initial state with a certain height, and the pre-lifted sectional materials are randomly placed.
When the steel wire rope connecting the travelling crane and the pulley 12 is used for lowering the special rotary overturning lifting appliance for the profile, the rotary device 2 rotates the lower hanging frame 4 to a specified estimated angle, and the overturning electromagnet system 5 overturns all electromagnets 56 to the estimated angle. When the electromagnet 56 is close to the hung section steel, the rotating angle and the overturning angle of the special rotating overturning lifting tool for the section steel are finely adjusted to a feasible angle, and the special rotating overturning lifting tool is continuously lowered until the adsorption surface of the electromagnet 56 is attached to the adsorbed surface of the section steel, the electromagnet 56 is electrified, and the hung section steel is adsorbed.
And (3) aligning the special rotary overturning lifting appliance for the profile, and moving to an unloading position along with the travelling crane.
Then, the electromagnet 56 and the absorbed section bar rotate the lifting tool and the overturning electromagnet 56 again according to the actual placing requirement of the section bar rack, when the section bar is adjusted to a proper angle, the electromagnet 56 is powered off after the hanging chain 52 of the electromagnet 56 is continuously lowered to be basically not stressed, and the section bar is lifted to a designated position.
And finally, aligning the special rotary overturning lifting appliance for the profile, and moving to the starting position of the next cycle along with the travelling crane.
When any section bar or part is lifted or placed, the electromagnet adsorption surface is not parallel to the pre-adsorption surface of the section bar or the welding piece or is not parallel to the placement plane after the section bar or the welding piece is adsorbed by the electromagnet, and the section bar or the part is stably adsorbed or desorbed by turning the electromagnet.
The embodiments described above are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (6)
1. The chain anti-drop device is arranged on the chain transmission mechanism; the method is characterized in that: comprises a retainer (551) and two symmetrically arranged sprocket assemblies (552);
wherein the retainer (551) is rotatably connected with a gear of the chain transmission mechanism;
both sprocket assemblies (552) include: a sprocket shaft (552 a) and a sprocket (552 b);
the sprocket shaft (552 a) is rotatably connected with the retainer (551);
the chain wheel (552 b) is fixed on two chain wheel shafts (552 a), and the two chain wheels (552 b) are positioned on one side of the retainer (551);
the chain of the chain transmission mechanism is meshed with one chain wheel (552 b), then meshed with a gear of the chain transmission mechanism, and then meshed with the other chain wheel (552 b);
further comprising a transition gear assembly (553);
both ends of the sprocket shaft (552 a) penetrate both sides of the holder (551);
the transition gear assembly (553) includes: a transition gear shaft (553 a) and a transition gear (553 b); the transition gear shaft (553 a) is rotatably connected with the retainer (551); the transition gear (553 b) is fixed on the transition gear shaft (553 a);
the two sprocket assemblies (552) further include a synchronizing gear (552 c); the synchronizing gear (552 c) is fixedly connected with the sprocket shaft (552 a);
the transition gear shaft (553 a) and the two synchronous gears (552 c) are positioned at the other side of the retainer (551);
the transition gear shaft (553 a) is positioned between the two synchronous gears (552 c) and is respectively meshed with the two synchronous gears (552 c);
the number of teeth and the modulus of the transition gear (553 b) and the synchronous gear (552 c) are the same;
the sprocket assembly (552) further includes two chain limiting portions (554);
limiting plates (554 a) are fixed at two ends of the holding frame (551); two limiting plates (554 a) are adjacent to the circumferences of the two sprockets (552 b), respectively.
2. The chain anti-slip device of claim 1, wherein:
wherein, the distance between the two chain wheels (552 b) and the meshing position of the chain (52) is equal to the distance between the two sides of the magnet overturning driven wheel (54) and the meshing position of the chain (52).
3. The chain anti-slip device of claim 1, wherein:
wherein the chain limiting part (554) further comprises a fixed plate (554 b);
the limiting plate (554 a) and the fixing plate (554 b) are mutually perpendicular and are L-shaped;
one end of the two sprocket shafts (552 a) also passes through the fixing plate (554 b) and is rotatably connected with the fixing plate (554 b).
4. The chain anti-slip device of claim 1, wherein:
wherein the chain of the chain drive passes between a sprocket (552 b) and a stop plate (554 a).
5. A flipping system, characterized by:
comprising two chain drive mechanisms, two chain anti-drop devices according to any one of claims 1 to 4 and a turnover element;
wherein, the two chain transmission mechanisms and the two chain anti-drop devices are symmetrically arranged at the two sides of the turnover piece;
the chain transmission mechanism comprises a gear and a chain (52);
both sides of the turnover piece are fixed on the two gears;
two chains (52) are respectively engaged with one sprocket (552 b) on the side, then engaged with a gear, and then engaged with the other sprocket (552 b) on the side.
6. The flipping system of claim 5, wherein:
wherein, the turnover piece is an electromagnet (56).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010962434.5A CN111998046B (en) | 2020-09-14 | 2020-09-14 | Chain anti-drop device and tilting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010962434.5A CN111998046B (en) | 2020-09-14 | 2020-09-14 | Chain anti-drop device and tilting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111998046A CN111998046A (en) | 2020-11-27 |
| CN111998046B true CN111998046B (en) | 2024-02-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010962434.5A Active CN111998046B (en) | 2020-09-14 | 2020-09-14 | Chain anti-drop device and tilting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111998046B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1233209A1 (en) * | 2001-01-25 | 2002-08-21 | Tecan Trading AG | Displacement device with a toothed belt engaging a gear rack |
| JP2005172103A (en) * | 2003-12-10 | 2005-06-30 | Gates Unitta Asia Co | Belt tension device |
| CN201891812U (en) * | 2010-12-15 | 2011-07-06 | 国家林业局北京林业机械研究所 | Transmission device used for accurate positioning |
| CN203035869U (en) * | 2012-12-25 | 2013-07-03 | 山东环球印铁制罐有限公司 | Chain anti-derailment device for printing chamber |
| CN206468758U (en) * | 2017-01-24 | 2017-09-05 | 广州红尚机械制造有限公司 | Mixer horizontal link chain compensates tensioning apparatus |
| CN107255145A (en) * | 2017-07-27 | 2017-10-17 | 江苏双燕电气箱柜有限公司 | A kind of transmission mechanism of compact shelving |
| CN213017542U (en) * | 2020-09-14 | 2021-04-20 | 中船第九设计研究院工程有限公司 | Chain anti-disengaging device and turnover system |
-
2020
- 2020-09-14 CN CN202010962434.5A patent/CN111998046B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1233209A1 (en) * | 2001-01-25 | 2002-08-21 | Tecan Trading AG | Displacement device with a toothed belt engaging a gear rack |
| JP2005172103A (en) * | 2003-12-10 | 2005-06-30 | Gates Unitta Asia Co | Belt tension device |
| CN201891812U (en) * | 2010-12-15 | 2011-07-06 | 国家林业局北京林业机械研究所 | Transmission device used for accurate positioning |
| CN203035869U (en) * | 2012-12-25 | 2013-07-03 | 山东环球印铁制罐有限公司 | Chain anti-derailment device for printing chamber |
| CN206468758U (en) * | 2017-01-24 | 2017-09-05 | 广州红尚机械制造有限公司 | Mixer horizontal link chain compensates tensioning apparatus |
| CN107255145A (en) * | 2017-07-27 | 2017-10-17 | 江苏双燕电气箱柜有限公司 | A kind of transmission mechanism of compact shelving |
| CN213017542U (en) * | 2020-09-14 | 2021-04-20 | 中船第九设计研究院工程有限公司 | Chain anti-disengaging device and turnover system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111998046A (en) | 2020-11-27 |
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