CN116815862B - Full-automatic quick change device integrating double locking devices on grapple system - Google Patents
Full-automatic quick change device integrating double locking devices on grapple system Download PDFInfo
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- CN116815862B CN116815862B CN202310464805.0A CN202310464805A CN116815862B CN 116815862 B CN116815862 B CN 116815862B CN 202310464805 A CN202310464805 A CN 202310464805A CN 116815862 B CN116815862 B CN 116815862B
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- 230000008859 change Effects 0.000 title description 19
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 abstract 2
- 238000000429 assembly Methods 0.000 abstract 2
- 238000009434 installation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000270722 Crocodylidae Species 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Shovels (AREA)
Abstract
The invention discloses a full-automatic quick-change connector integrating a double-locking device on a grapple system, which belongs to the field of quick-change connectors and comprises a quick-change body, wherein a hydraulic cylinder is arranged in the quick-change body, the lower ends of side plates on two sides of the quick-change body are movably provided with sliding plates, one end of each side plate at the lower end of each sliding plate is fixedly provided with a U-shaped groove, one end of each sliding plate bottom far away from each U-shaped groove is parallel and symmetrically provided with a pair of locking hooks, the surfaces of the sliding plates at the upper ends of the locking hooks are provided with locking assemblies capable of being restrained and adjusted, the sliding plates move so as to enable the locking assemblies and the sliding plates to lock or unlock front shafts and rear shafts of operation accessories.
Description
Technical Field
The invention relates to the technical field of quick-change connectors, in particular to a full-automatic quick-change connector which integrates a double-lock device into a grapple hook system.
Background
With the increasing development of the excavator technology, the excavator is expanded from the traditional excavating, crushing and backfilling functions realized by a bucket to the functions of more than 10 types of earth boring, vibrating compaction, crocodile pliers breaking, grapple clamping, soil loosening, rolling, tunneling, rock opening and the like realized by installing different operation accessories, and the use value and the use range of the excavator are greatly improved. In order to meet the operation requirement, the operation accessories are required to be replaced frequently in construction, and the quick-change connector (also called as an excavator quick-change connector) of the excavator can enable the excavator to be replaced with various operation accessories quickly, so that one machine is multipurpose, the hoisting and dismounting time is reduced, the working efficiency is improved, and the resources are saved
In order to quickly change various operation accessories on the excavator, the excavator is multipurpose, lifting and detaching time is reduced, working efficiency is further improved, a plurality of excavator quick change connecting devices are designed successively by a person skilled in the art, the excavator quick change connecting devices are generally divided into two main types of mechanical quick change connecting devices and hydraulic quick change connecting devices, and the locking hook type quick change connector of the hydraulic quick change connecting device is used conveniently and fast and has good locking force so as to be used frequently. However, the locking force of the front lock hook of the lock hook type hydraulic quick-change connector with the traditional structure is completely dependent on the locking hydraulic cylinder, so that frequent change load of the operation accessory in the operation process directly acts on the locking hydraulic cylinder, the service life of the locking hydraulic cylinder is easy to be reduced, the unhooking phenomenon that the connecting pin shaft of the operation accessory falls off from the front fixed lock hook or the rear movable lock hook is easy to cause operation accidents under the condition that the hydraulic cylinder leaks and fails.
In order to avoid the safety problem, the technical staff in the field further improves the quick-change connector, the traditional double-lock quick-change connector is mainly provided with a locking position at the front tiger mouth, the locking of the rear axle is less, the rear stroke is set to be smaller, the quick-change application range is smaller, the force acts on the spring, the spring is damaged under larger pressure, the service life is greatly shortened, and when the accessory is switched in the quick-change operation, the operation action of an operator is more complex, and the use efficiency is reduced.
Patent document CN213926426U discloses a safety device using a hydraulically controlled check valve, ensuring safety; the front-back automatic double-lock mechanism is added, so that even if oil leakage of the oil cylinder fails and a pipeline is broken, the accessory can be prevented from falling off the machine; ensuring safety and meeting the requirements of new law; the design of multiple center distances reduces the cost of multiple machine type configuration accessories; the connector is designed to be automatically locked, and an operator does not need to manually install a safety pin when getting off; the accessory can be quickly replaced, the structural complexity is high, the design cost is high, and the device is not suitable for large-scale production.
Disclosure of Invention
The invention aims to provide a full-automatic quick-change integrated double-locking device and a grapple system, which are simple in structure and convenient to use, so as to solve the defect that the accessories are unhooked due to failure of a locking hydraulic cylinder when a load directly acts on the locking hydraulic cylinder in the traditional quick-change operation in the prior art.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the utility model provides a collect full-automatic quick change of double-lock device in grapple system, includes the quick change body, establishes the pneumatic cylinder in the quick change body, the curb plate lower extreme on both sides is movably provided with the slide on the quick change body, and the slide lower extreme curb plate has one end to be fixed with U type groove, the slide bottom is kept away from U type groove one end and is parallel and the symmetry is equipped with a pair of latch hook, and the slide surface mounting of latch hook upper end has the locking subassembly that can retrain the regulation, the slide removes to make locking subassembly, slide locking or unblock operation accessory front and back axle.
The side plates on two sides of the quick-change body are provided with sliding grooves at equal heights, the edges of the sliding plates are correspondingly arranged in the sliding grooves, a hydraulic cylinder with a hydraulic control one-way safety valve is arranged between the side plates on two sides of the quick-change body, and a hydraulic shaft of the hydraulic cylinder is connected with a locking assembly.
The quick-change body curb plate is including a sideboard, the sideboard of No. two that set up from top to bottom, the spacer plate that still fixed connection has the socket between No. one sideboard, the sideboard of No. two, peg graft in the socket has the shrouding, and shrouding one end passes through the end cover of bolt fixed connection quick-change body.
The locking assembly comprises two parallel mounting seats which are symmetrically fixed on the sliding plate, a connecting shaft on a hydraulic shaft of the hydraulic cylinder is movably arranged in a long hole on the mounting seat, a hinge point shaft is inserted between the two mounting seats, a clamping plate is elastically connected between the end part of the hinge point shaft penetrating out of the mounting seat and the mounting seat through a torsion spring, a strip-shaped opening is arranged at the edge part of the mounting seat, and the edge part of the triangular bayonet on the clamping plate is movably abutted against one end of the strip-shaped opening, which is close to the hydraulic cylinder.
The torsion spring is sleeved at the end part of the hinge point shaft, one end of the torsion spring is connected with the adjacent clamping plate, and the other end of the torsion spring is connected with the adjacent mounting seat.
The bottom of one end of the sliding plate adjacent to the U-shaped groove extends to form a bulge.
The U-shaped groove is characterized in that the height of the opening edge part of the U-shaped groove is higher than the height of the groove surface at the bottommost part of the U-shaped groove.
According to the technical scheme, the invention has the following effects:
the locking component designed by the device has the advantages that after the hydraulic cylinder drives the sliding plate to move to install the operation accessory, the installed accessory cannot load on the hydraulic shaft of the hydraulic cylinder, the service life of the hydraulic cylinder is greatly prolonged, the structure can still ensure that the claw hook firmly grabs the rear shaft of the accessory under the protection of the locking component under the condition that the oil cylinder fails or even breaks, the accessory is prevented from falling off, the sliding plate and the U-shaped groove form another locking area, and the device is simple to operate and strong in stability;
the protruding is arranged at one end of the sliding plate, the sliding plate is matched with the clamping plate in the locking assembly, the front shaft and the rear shaft of the accessory can be firmly limited and locked, and the stability of the mounted accessory is further enhanced.
The partition plate is further installed on the side plate of the quick-change body, the sealing plate is quickly limited through the insertion opening on the partition plate and is fixed through bolts, the top of the quick-change body is covered by the sealing plate, sundries are prevented from entering the quick-change body, the cleanliness of the device is guaranteed, and the hydraulic cylinder of the outside articles (branches, stones and the like) is prevented from damaging the working process.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a block diagram of the present invention with one side plate of the quick change body removed;
FIG. 4 is a view of the structure of the present invention from another perspective, except for one side plate of the quick-change body;
FIG. 5 is an enlarged view of FIG. 4 at A;
FIG. 6 is a schematic view of the attachment mounting shaft after it is secured;
FIG. 7 is an overall schematic diagram of the attachment after installation.
Wherein: 1 quick-change body, 2 shrouding, 3 division board, 4U type groove, 5 arch, 6 pneumatic cylinder, no. 7 sideboard, no. 71 sideboard, 8 torsion spring, 9 spout, 10 slide, 11 mount pad, 12 hinge point axle, 13 cardboard, 14 latch hook, 15 connecting axle.
Description of the embodiments
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1 to 5, the invention discloses a full-automatic quick-change device for a grapple hook system, which comprises a quick-change body 1, wherein a hydraulic cylinder 6 is arranged in the quick-change body 1, the hydraulic cylinder 6 is arranged in the quick-change body 1, a sliding plate 10 is movably arranged at the lower ends of side plates on two sides of the quick-change body 1, one end of the side plate at the lower end of the sliding plate 10 is fixedly provided with a U-shaped groove 4, one end of the bottom of the sliding plate 10 far away from the U-shaped groove 4 is parallel and symmetrically provided with a pair of locking hooks 14, the surface of the sliding plate 10 at the upper end of each locking hook 14 is provided with a locking assembly capable of being regulated in a restraining way, and the sliding plate 10 moves to enable the locking assembly and the sliding plate 10 to lock or unlock front and rear shafts of operation accessories.
In specific observation of fig. 3 and 4, the opposite surfaces of the side plates on two sides of the quick-change body 1 are provided with sliding grooves 9 at equal heights, the edges of the sliding plates 10 are correspondingly arranged in the sliding grooves 9, a hydraulic cylinder 6 is arranged between the side plates on two sides of the quick-change body 1, a hydraulic shaft of the hydraulic cylinder 6 is connected with a locking assembly, and the hydraulic cylinder 6 is started to drive the sliding plates 10 and the locking assembly to reciprocate.
The better design, with the curb plate components of a whole that can function independently design of quick change body, the curb plate includes a sideboard 7, no. two sideboards 71 that set up from top to bottom, no. one sideboard 7, no. two sideboards 71 between still fixed connection have the division board 3 of socket, peg graft in the socket has shrouding 2, and shrouding 2 one end passes through the end cover of bolt fixed connection quick change body 1, division board 3 cooperation bolt can realize the installation dismantlement of shrouding 2 fast, prevent debris entering quick change body, guarantee the clean degree of this device, also prevent the pneumatic cylinder of external article (branch) harm during operation.
The specific structure of the locking assembly can be observed in fig. 4 and 5, the locking assembly comprises two mounting seats 11 which are parallel and symmetrically fixed on the sliding plate 10, a connecting shaft 15 on a hydraulic shaft of the hydraulic cylinder 6 is movably arranged in a long hole on the mounting seat 11, a hinge point shaft 12 is inserted between the two mounting seats 11, a clamping plate 13 is elastically connected between the end part of the hinge point shaft 12 penetrating out of the mounting seat 11 and the mounting seat 11 through a torsion spring 8, a strip-shaped opening is arranged at the edge part of the sliding plate 10, the triangular bayonet edge part on the clamping plate 13 is movably abutted against one end of the strip-shaped opening close to the hydraulic cylinder 6, the locking assembly is specifically installed, the torsion spring 8 is sleeved at the end part of the hinge point shaft 12, one end edge of the torsion spring 8 is connected with an adjacent clamping plate 13, and the other end edge of the torsion spring 8 is connected with an adjacent mounting seat 11;
the hydraulic cylinder 6 is started to retract the hydraulic rod, the distance between the lock hook 14 and the U-shaped groove 4 is reduced, at the moment, one mounting shaft of the accessory is arranged in the U-shaped groove 4, then the hydraulic rod is extended to drive the sliding plate 10 to move, the distance between the U-shaped groove 4 and the lock hook 14 is increased, meanwhile, the other mounting shaft of the accessory is ensured to enter the hook groove of the lock hook 14 until the two mounting shafts of the accessory correspondingly abut against the lock hook 14 and the groove wall of the U-shaped groove 4, one side of a bayonet on the clamping plate 13 in the locking assembly abuts against the sliding plate 10 at the strip-shaped opening, and the other side abuts against the mounting shaft of the accessory, and the accessory in the state is locked, namely, the installation is completed.
Still other embodiments provide a protrusion 5 extending from the bottom of the end of the slider 10 adjacent to the U-shaped slot 4, the protrusion 5 limiting the mounting axis of the accessory at this time, forming a locking area. The height of the opening edge of the U-shaped groove 4 is higher than that of the bottom groove surface of the U-shaped groove 4, and the locking stability of the locking area is improved.
The device is specifically used and the working principle thereof is as follows: referring to fig. 2, the rear is referred to as the right side of fig. 2, and the front is referred to as the left side of fig. 2.
Figures 6 and 7 show the installed state of the bucket as an accessory.
When the accessory needs to be discharged, the hydraulic cylinder 6 is retracted, the connecting shaft 15 on the output shaft of the hydraulic cylinder 6 moves forwards in the long hole of the mounting seat 11, the clamping plate 13 is pushed to rotate around the hinge point, the rear lock is opened, then the quick change is rotated around the bending U-shaped groove 4, after the lock hook 14 is separated from the accessory, the oil cylinder is extended, the connecting shaft 15 of the hydraulic cylinder 6 moves backwards in the long hole, the lock hook 14 is pushed to move backwards, and when the front end of the sliding plate 10 moves to the inner side of the bending U-shaped groove, the front shaft of the accessory can be separated.
When the accessory needs to be installed, the hydraulic cylinder 6 stretches to a hydraulic rod, the connecting shaft 15 on the hydraulic cylinder 6 moves backwards in the long hole of the installation seat 11 and pushes the lock hook 14 to move backwards, when the front end of the sliding plate 10 moves to the inner side of the U-shaped groove 4, the front shaft of the accessory can enter the U-shaped groove 4, then the hydraulic cylinder 6 retracts, the quick-change is rotated around the U-shaped groove 4, when the rear shaft of the accessory is lapped on the side plate of the quick-change main body, the hydraulic cylinder 6 stretches, at the moment, the rear shaft of the accessory pushes the clamping plate 13 to lift and enter the lock hook 14, and after the rear shaft of the accessory passes over the clamping plate 13, the clamping plate 13 resets to limit the rear shaft of the accessory under the action of the restoring force of the torsion spring 8. The rear lock is formed under the action of the bayonet of the torsion spring 8 and the bayonet of the clamping plate 13, and the convex bottom of the front end of the sliding plate 10 and the U-shaped groove 4 form a small-caliber bayonet to form the front lock.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (2)
1. The full-automatic quick-change device for the grapple hook system is characterized by comprising a quick-change body (1);
sliding grooves (9) are formed in the opposite surfaces of the side plates on the two sides of the quick-change body (1) at the same height, sliding plates (10) are movably arranged at the lower ends of the side plates on the two sides of the quick-change body (1), and the edges of the sliding plates (10) are correspondingly arranged in the sliding grooves (9);
one end of a side plate at the lower end of the sliding plate (10) is fixed with a U-shaped groove (4); the height of the opening edge of the U-shaped groove (4) is higher than the height of the groove surface at the bottommost part of the U-shaped groove (4);
a bulge (5) extends from the bottom of one end of the sliding plate (10) adjacent to the U-shaped groove (4);
the bottom of the sliding plate (10) is far away from one end of the U-shaped groove (4) and is provided with a pair of lock hooks (14) in parallel and symmetrically
The surface of the sliding plate (10) at the upper end of the lock hook (14) is provided with two mounting seats (11) which are symmetrical in parallel and fixed on the sliding plate (10); symmetrical long holes are formed in the two mounting seats, and a connecting shaft (15) is arranged in each long hole; the connecting shaft (15) is movably arranged in the long hole;
a hydraulic cylinder (6) is arranged in the quick-change body (1) and is positioned between two side plates of the quick-change body (1); the hydraulic shaft of the hydraulic cylinder (6) is connected with the connecting shaft (15);
a hinge point shaft (12) is inserted between the two mounting seats (11), a clamping plate (13) is elastically connected between the end part of the hinge point shaft (12) penetrating out of the mounting seat (11) and the mounting seat (11) through a torsion spring (8), a strip-shaped opening is arranged at the edge part of the sliding plate (10), and the triangular bayonet edge part on the clamping plate (13) is movably abutted against one end of the strip-shaped opening, which is close to the hydraulic cylinder (6);
the torsion spring (8) is sleeved at the end part of the hinge point shaft (12), one end of the torsion spring (8) is connected with the adjacent clamping plate (13), and the other end of the torsion spring is connected with the adjacent mounting seat (11);
the sliding plate (10) moves to enable the U-shaped groove (4) and the bulge (5) to be matched with each other to lock or unlock a front shaft of the operation accessory, and enable the locking hook (14) and the clamping plate (13) to be matched with each other to lock or unlock a rear shaft of the operation accessory.
2. The full-automatic quick-change device for the grapple hook system according to claim 1, wherein the side plates of the quick-change body (1) comprise a first side plate (7) and a second side plate (71) which are arranged up and down, a partition plate (3) with a socket is fixedly connected between the first side plate (7) and the second side plate (71), a sealing plate (2) is inserted into the socket, and one end of the sealing plate (2) is fixedly connected with an end cover of the quick-change body (1) through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310464805.0A CN116815862B (en) | 2023-04-26 | 2023-04-26 | Full-automatic quick change device integrating double locking devices on grapple system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310464805.0A CN116815862B (en) | 2023-04-26 | 2023-04-26 | Full-automatic quick change device integrating double locking devices on grapple system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116815862A CN116815862A (en) | 2023-09-29 |
| CN116815862B true CN116815862B (en) | 2023-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310464805.0A Active CN116815862B (en) | 2023-04-26 | 2023-04-26 | Full-automatic quick change device integrating double locking devices on grapple system |
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| Country | Link |
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| CN (1) | CN116815862B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010016491A1 (en) * | 2010-04-16 | 2011-10-20 | Lehnhoff Hartstahl Gmbh & Co. Kg | Quick-change device with an active bracing support for coupling a tool to a work machine |
| CN204023658U (en) * | 2014-08-29 | 2014-12-17 | 徐工集团工程机械股份有限公司道路机械分公司 | Compact hydraulic facility fast replacing device for excavator |
| CN112267501A (en) * | 2020-10-16 | 2021-01-26 | 三一重机有限公司 | Connecting device and excavator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004038110A1 (en) * | 2002-10-24 | 2004-05-06 | Bruce Archibald Short | Connector for earth moving implements |
-
2023
- 2023-04-26 CN CN202310464805.0A patent/CN116815862B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010016491A1 (en) * | 2010-04-16 | 2011-10-20 | Lehnhoff Hartstahl Gmbh & Co. Kg | Quick-change device with an active bracing support for coupling a tool to a work machine |
| CN204023658U (en) * | 2014-08-29 | 2014-12-17 | 徐工集团工程机械股份有限公司道路机械分公司 | Compact hydraulic facility fast replacing device for excavator |
| CN112267501A (en) * | 2020-10-16 | 2021-01-26 | 三一重机有限公司 | Connecting device and excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116815862A (en) | 2023-09-29 |
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