CA1153339A - Anti-sway, anti-rotation mechanism for crane reeving - Google Patents
Anti-sway, anti-rotation mechanism for crane reevingInfo
- Publication number
- CA1153339A CA1153339A CA000344842A CA344842A CA1153339A CA 1153339 A CA1153339 A CA 1153339A CA 000344842 A CA000344842 A CA 000344842A CA 344842 A CA344842 A CA 344842A CA 1153339 A CA1153339 A CA 1153339A
- Authority
- CA
- Canada
- Prior art keywords
- lifting beam
- sheaves
- overhead
- beam assembly
- cables
- 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.)
- Expired
Links
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
- B66C13/04—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
-
- 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
- B66C13/06—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for minimising or preventing longitudinal or transverse swinging of loads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
ANTI-SWAY, ANTI-ROTATION MECHANISM
FOR CRANE REEVING
ABSTRACT OF THE DISCLOSURE
An anti-sway, anti-rotation mechanism for crane reeving comprises four spaced-apart overhead sheaves on an overhead support. A lifting beam assembly has four pairs of lifting beam sheaves. The pairs of lifting beam sheaves are spaced-apart from each other. A grapple is pivotally connected to the lifting-beam assembly. Cables are connec-ted to the winding drum and extend between each pair of lifting beam sheaves and two-adjacent overhead sheaves in a V-shaped arrangement to keep the lifting beam assembly level and prevent the lifting beam assembly from swaying and rotating, during operation of the crane.
FOR CRANE REEVING
ABSTRACT OF THE DISCLOSURE
An anti-sway, anti-rotation mechanism for crane reeving comprises four spaced-apart overhead sheaves on an overhead support. A lifting beam assembly has four pairs of lifting beam sheaves. The pairs of lifting beam sheaves are spaced-apart from each other. A grapple is pivotally connected to the lifting-beam assembly. Cables are connec-ted to the winding drum and extend between each pair of lifting beam sheaves and two-adjacent overhead sheaves in a V-shaped arrangement to keep the lifting beam assembly level and prevent the lifting beam assembly from swaying and rotating, during operation of the crane.
Description
~153339 This invention relates to an anti-sway, anti-rotation mechanism for crane reeving.
With many loading cranes, for exa~ple log handling portal cranes, it is desirable to lift unbalanced loads with a grapple or to lift logs, or other items, from the side of a pile. However, if this is attempted with the standard arrangement of cables and grapple, several problems arise.
An unbalanced load may cause the cables to deviate from the vertical, possibly allowing the logs or other material to contact the crane and cause damage. Additionally, attempt-ing to retrieve logs from the side of a pile with a standard crane may result in dangerous swinging of the load and entangling of the cables as the load is lifted. Accordingly, it would be desirable to provide a mechanism which would permit a crane to lift an unbalanced load, thus making handling faster, while maintaining the crane cables ver-tical. Similarly, it would be desirable to provide a crane where the logs or other items could be retrieved from the side of a pile while the cables remain vertical.
In the past, the arrangement of four cables extending downwardly rrom a winding drum and passing through four spaced-apart sheaves on a load carrying fra~e has been employed for container handling cranes as seen, for example, in Canadian Patent 679,557 to Ramsen. However, this arrange-ment has been used only to keep the load level and this patent does not disclose a combination which prevents swaying and rotation, permits the crane to lift an unbalanced load of logs, or the like, or which permits the crane to retrieve logs from the s~de of a storage pile.
`` 1153339 The invention prov.ides an ant:i-sway, anti-rotation mechanism for reeving oE a crane having an overhead support with a winding drum, the mechanism comprising four spaced-apart overhead sheaves on the overhead support, the winding drum being between two pairs of the overhead sheaves; a lifting beam assembly with four pairs of llfting beam sheaves, the pairs of sheaves being spaced-apart from each other;
load carrying means connected to the lifting beam assembly;
and four cables comprising two pairs of adjacent cables extending downwardly from the winding drum, each cable extending downwardly and about one said lifting beam sheave of one said pair of lifting beam sheaves, then upwardly and about an overhead sheave, then downwardly and about another said lifting beam sheave of another pair of lifting beam sheaves adjacent said one pair of sheaves, then upwardly to an end of the cable adjacent the overhead support to prevent swaying and rotation of the lifting beam assembly during operation of the crane and to keep the lifting beam assembly level.
The invention permits the load carrying means, or grapple, to hang at an angle with the vertical, as would occur when the grapple is carrying an unbalanced load or retrieving logs from the side of a pile, while maintaining the alignment of the cables with the vertical. Consequently, no dangerous swinging of the load occurs and there is no additional risk of the load contacting the crane structure.
The speed of handling is accordingly increased, since there is no need to balance loads for safe handling, and the grapple can easily retrieve logs, or other material, from a sloping pile.
In drawings which illustrate embodiments of the invention:
Figure 1 is a side elevational view showing an anti-sway, anti-rotation mechanism, according to an embodi-ment of the invention, associated with the trolley of a ~, portal crane;
With many loading cranes, for exa~ple log handling portal cranes, it is desirable to lift unbalanced loads with a grapple or to lift logs, or other items, from the side of a pile. However, if this is attempted with the standard arrangement of cables and grapple, several problems arise.
An unbalanced load may cause the cables to deviate from the vertical, possibly allowing the logs or other material to contact the crane and cause damage. Additionally, attempt-ing to retrieve logs from the side of a pile with a standard crane may result in dangerous swinging of the load and entangling of the cables as the load is lifted. Accordingly, it would be desirable to provide a mechanism which would permit a crane to lift an unbalanced load, thus making handling faster, while maintaining the crane cables ver-tical. Similarly, it would be desirable to provide a crane where the logs or other items could be retrieved from the side of a pile while the cables remain vertical.
In the past, the arrangement of four cables extending downwardly rrom a winding drum and passing through four spaced-apart sheaves on a load carrying fra~e has been employed for container handling cranes as seen, for example, in Canadian Patent 679,557 to Ramsen. However, this arrange-ment has been used only to keep the load level and this patent does not disclose a combination which prevents swaying and rotation, permits the crane to lift an unbalanced load of logs, or the like, or which permits the crane to retrieve logs from the s~de of a storage pile.
`` 1153339 The invention prov.ides an ant:i-sway, anti-rotation mechanism for reeving oE a crane having an overhead support with a winding drum, the mechanism comprising four spaced-apart overhead sheaves on the overhead support, the winding drum being between two pairs of the overhead sheaves; a lifting beam assembly with four pairs of llfting beam sheaves, the pairs of sheaves being spaced-apart from each other;
load carrying means connected to the lifting beam assembly;
and four cables comprising two pairs of adjacent cables extending downwardly from the winding drum, each cable extending downwardly and about one said lifting beam sheave of one said pair of lifting beam sheaves, then upwardly and about an overhead sheave, then downwardly and about another said lifting beam sheave of another pair of lifting beam sheaves adjacent said one pair of sheaves, then upwardly to an end of the cable adjacent the overhead support to prevent swaying and rotation of the lifting beam assembly during operation of the crane and to keep the lifting beam assembly level.
The invention permits the load carrying means, or grapple, to hang at an angle with the vertical, as would occur when the grapple is carrying an unbalanced load or retrieving logs from the side of a pile, while maintaining the alignment of the cables with the vertical. Consequently, no dangerous swinging of the load occurs and there is no additional risk of the load contacting the crane structure.
The speed of handling is accordingly increased, since there is no need to balance loads for safe handling, and the grapple can easily retrieve logs, or other material, from a sloping pile.
In drawings which illustrate embodiments of the invention:
Figure 1 is a side elevational view showing an anti-sway, anti-rotation mechanism, according to an embodi-ment of the invention, associated with the trolley of a ~, portal crane;
- 2 -llS333~3 Figure 2, appearing after Figure 4, is a reeving diagram for the mechanism;
Figure 3 is a perspective view showing the llftinq beam assembly of the mechanism and the grapple loading from a sloping pile of logs;
Figure 4 is a perspective view showing the lifting beam assembly and the grapple carrying an unbalanced load of logs; and Figure 5 is a side elevational view, partly in section, of a device for adjusting the lengths of cables of the mechanism.
The drawings illustrate an anti-sway, anti-rota-tion mechanism 1 for cranes. The mechanism 1 is associated with an overhead support, in this case the trolley 2 of an overhead crane. The mechanism is suitable for portal-type or rotating-type log handling cranes as well as other types of overhead cranes. The mechanism includes four spaced-apart overhead sheaves 4, 6, 8 and 10, each rotatably connected to the trolley 2. The winding drum 11 is between the pair of overhead sheaves-4 and 6 and the pair of sheaves 8 and 10.
The mechanism 1 includes a lifting beam assembly 18 which is cruciform in shape, having four arms 22, 24, 26 and 28, extending at right angles to each other. The lifting beam assembly 18 has four pairs of lifting beam sheaves 36, 38, 40 and 42, which are spaced-apart from each other. Each pair comprises a pair of coaxial and adjacent lifting beam sheaves rotatably connected to the arms, for example, outer sheave 37 and inner sheave 39 of pair 36.
A cable basket 46 is connected to the top of ~iS3339 lifting beam assembly 18 and its top 48 is adapted to contact the limit switch assembly 50, suspended by cables 52, when the lifting beam reaches it upper limit.
A load carrying.means or grapple 54 i9 rotatably connected to the bottom 56 of lifting beam assembly 18, for rotation about vertical axis 57, by means of the double articulated joint 58. Joint 58 has a pair of link pins 60 and 62 at right angles to each other to permit pivoting of grapple 54 about two perpendicular, horizontal axes.
Grapple 54 is a standard type of grapple employing a pair of cylinders 59 and 61 to open and close a pair of load carry-ing arms 63 and 64.
The lifting beam assembly 18 is suspended below the trolley 2 by means of four:cable assemblies including a first pair of cables 72 and 74 and a second pair of cables 76 and 78. Cable 72 extends downwardly from drum 11 towards lifting beam assembly 18 and extends about the inner sheave of the pair of sheaves 36. From here, cable 72 extends upwardly and about overhead sheave 8. From sheave 8, cable , 20 72 extends downwardly and abou* the inner sheave of the pair of sheaves 40 which is adjacent pair 36. Cable 72 then extends upwardly to its end 80 which is connected to trolley . 2.
There is an adjusting means or mechanism 84 near the end 80 of cable 72 for adjusting its length and similar mechanisms for each of the other cables. As seen in Figure 5, there is a tensioning pulley 90 connected to the trolley 2. Cable 72 extends over sheave 90 and is connected to an eye bolt 94 at its end 80 by means of three rope clips 96 and a thimble 98. Bolt 94 extends through aperture 100 in 115333~1 retainer 102 at the end of a sleeve 104 which i8 connected to the frame 106 of the trolley 2. A nut 108 is threadedly received on the end of bolt 94, while cotter pin 110 and lock nut 112 keep nut 108 in place~ Bolt 94 and nut 108 provide a threaded connector connected to the cable 72, whereby the length of the cable can be adjusted by tighten-ing or loosening nut 108.
Cable 74 extends downwardly from the drum 11 and about the outer sheave of the pair of sheaves 36. From here, cable 74 extends upwardly and about overhead sheave 4, which is ad;acent sheave 8 of cable 72, and downwardly to the outer sheave of the pair of sheaves 42. From here, cable 74 extends upwardly to its end 114 which is connected to the trolley by ~eans of one of the adjusting mechanis~s 84.
While cables 72 and 74 both extend downwardly from drum 64 to the pair of lifting beam sheaves 36, they then extend to different, but~adjacent, overhead sheaves 4 and 8.
They then extend downwardly to opposite pairs of lifting beam sheaves 40 and 42.
The cables 76 and 78:extend downwardly and about the inner sheave and`outer sheave, respectively, of the pair of lifting beam sheaves 38. From pair 38, cable 76 extends upwardly, about overhead sheave 10, downwardly about the outer sheave of the pair of li~fting beam sheaves 40 and then upwardly to its end 116, which is connected to trolley 2 by means of one of the adjusting mechanisms 84.
From the pair of sheaves 38, cable 78 extends upwardly and then about overhead sheave 6. From here, cable 78 extends downwardly and about the inner sheave of the pair il53339 of li~ting beam sheaves 42. From here, cable 78 extends upwardly to its end 118 which is connected to the trolley 2 by means of one of the adjusting mechanisms 84.
In use, the simultaneous winding or unwinding of cables 72, 74, 76 and 78 by drum 11 permits the raising or lowering of lifting beam assembly 18 while maintaining its level attitude. In this respect, only, is the invention similar to the arrangement found in the container handling crane of Canadian Patent 679,557. In the preferred form of the invention, it should be noted that lifting beam assembly 18 is suspended from above the pair of lifting beam sheaves 40 at two-spaced apart points, namely adjacent overhead sheaves 8 and 10, by portions of cables 72 and 76. A
similar V-shaped arrangement of cables is found at each of the other pairs of lifting beam sheaves 36, 38, and 42.
This V-shaped arrangement prevents swaying of the lifting beam assembly 18 either along the axis of drum 11 or in the perpendicular direction.
Referring to Figure 3, it may be seen how the double articulated connection 58 permits the grapple 54 to rotate and pivot to pick up logs from the side of a pile while the lifting beam assembly 18 remains horizontal.
Similarly, Figure 4 i]lustrates how the grapple can be held at an angle to hold an unbalanced load of logs, while the lifting beam assembly 18 again remains level.
Figure 3 is a perspective view showing the llftinq beam assembly of the mechanism and the grapple loading from a sloping pile of logs;
Figure 4 is a perspective view showing the lifting beam assembly and the grapple carrying an unbalanced load of logs; and Figure 5 is a side elevational view, partly in section, of a device for adjusting the lengths of cables of the mechanism.
The drawings illustrate an anti-sway, anti-rota-tion mechanism 1 for cranes. The mechanism 1 is associated with an overhead support, in this case the trolley 2 of an overhead crane. The mechanism is suitable for portal-type or rotating-type log handling cranes as well as other types of overhead cranes. The mechanism includes four spaced-apart overhead sheaves 4, 6, 8 and 10, each rotatably connected to the trolley 2. The winding drum 11 is between the pair of overhead sheaves-4 and 6 and the pair of sheaves 8 and 10.
The mechanism 1 includes a lifting beam assembly 18 which is cruciform in shape, having four arms 22, 24, 26 and 28, extending at right angles to each other. The lifting beam assembly 18 has four pairs of lifting beam sheaves 36, 38, 40 and 42, which are spaced-apart from each other. Each pair comprises a pair of coaxial and adjacent lifting beam sheaves rotatably connected to the arms, for example, outer sheave 37 and inner sheave 39 of pair 36.
A cable basket 46 is connected to the top of ~iS3339 lifting beam assembly 18 and its top 48 is adapted to contact the limit switch assembly 50, suspended by cables 52, when the lifting beam reaches it upper limit.
A load carrying.means or grapple 54 i9 rotatably connected to the bottom 56 of lifting beam assembly 18, for rotation about vertical axis 57, by means of the double articulated joint 58. Joint 58 has a pair of link pins 60 and 62 at right angles to each other to permit pivoting of grapple 54 about two perpendicular, horizontal axes.
Grapple 54 is a standard type of grapple employing a pair of cylinders 59 and 61 to open and close a pair of load carry-ing arms 63 and 64.
The lifting beam assembly 18 is suspended below the trolley 2 by means of four:cable assemblies including a first pair of cables 72 and 74 and a second pair of cables 76 and 78. Cable 72 extends downwardly from drum 11 towards lifting beam assembly 18 and extends about the inner sheave of the pair of sheaves 36. From here, cable 72 extends upwardly and about overhead sheave 8. From sheave 8, cable , 20 72 extends downwardly and abou* the inner sheave of the pair of sheaves 40 which is adjacent pair 36. Cable 72 then extends upwardly to its end 80 which is connected to trolley . 2.
There is an adjusting means or mechanism 84 near the end 80 of cable 72 for adjusting its length and similar mechanisms for each of the other cables. As seen in Figure 5, there is a tensioning pulley 90 connected to the trolley 2. Cable 72 extends over sheave 90 and is connected to an eye bolt 94 at its end 80 by means of three rope clips 96 and a thimble 98. Bolt 94 extends through aperture 100 in 115333~1 retainer 102 at the end of a sleeve 104 which i8 connected to the frame 106 of the trolley 2. A nut 108 is threadedly received on the end of bolt 94, while cotter pin 110 and lock nut 112 keep nut 108 in place~ Bolt 94 and nut 108 provide a threaded connector connected to the cable 72, whereby the length of the cable can be adjusted by tighten-ing or loosening nut 108.
Cable 74 extends downwardly from the drum 11 and about the outer sheave of the pair of sheaves 36. From here, cable 74 extends upwardly and about overhead sheave 4, which is ad;acent sheave 8 of cable 72, and downwardly to the outer sheave of the pair of sheaves 42. From here, cable 74 extends upwardly to its end 114 which is connected to the trolley by ~eans of one of the adjusting mechanis~s 84.
While cables 72 and 74 both extend downwardly from drum 64 to the pair of lifting beam sheaves 36, they then extend to different, but~adjacent, overhead sheaves 4 and 8.
They then extend downwardly to opposite pairs of lifting beam sheaves 40 and 42.
The cables 76 and 78:extend downwardly and about the inner sheave and`outer sheave, respectively, of the pair of lifting beam sheaves 38. From pair 38, cable 76 extends upwardly, about overhead sheave 10, downwardly about the outer sheave of the pair of li~fting beam sheaves 40 and then upwardly to its end 116, which is connected to trolley 2 by means of one of the adjusting mechanisms 84.
From the pair of sheaves 38, cable 78 extends upwardly and then about overhead sheave 6. From here, cable 78 extends downwardly and about the inner sheave of the pair il53339 of li~ting beam sheaves 42. From here, cable 78 extends upwardly to its end 118 which is connected to the trolley 2 by means of one of the adjusting mechanisms 84.
In use, the simultaneous winding or unwinding of cables 72, 74, 76 and 78 by drum 11 permits the raising or lowering of lifting beam assembly 18 while maintaining its level attitude. In this respect, only, is the invention similar to the arrangement found in the container handling crane of Canadian Patent 679,557. In the preferred form of the invention, it should be noted that lifting beam assembly 18 is suspended from above the pair of lifting beam sheaves 40 at two-spaced apart points, namely adjacent overhead sheaves 8 and 10, by portions of cables 72 and 76. A
similar V-shaped arrangement of cables is found at each of the other pairs of lifting beam sheaves 36, 38, and 42.
This V-shaped arrangement prevents swaying of the lifting beam assembly 18 either along the axis of drum 11 or in the perpendicular direction.
Referring to Figure 3, it may be seen how the double articulated connection 58 permits the grapple 54 to rotate and pivot to pick up logs from the side of a pile while the lifting beam assembly 18 remains horizontal.
Similarly, Figure 4 i]lustrates how the grapple can be held at an angle to hold an unbalanced load of logs, while the lifting beam assembly 18 again remains level.
Claims (9)
1. An anti-sway, anti-rotation mechanism for reeving of a crane having an overhead support with a winding drum, the mechanism comprising:
four spaced-apart overhead sheaves on the overhead support, the winding drum being between two pairs of the overhead sheaves;
a lifting beam assembly with four pairs of lifting beam sheaves, the pairs of sheaves being spaced-apart from each other;
load carrying means connected to the lifting beam assembly; and four cables comprising two pairs of adjacent cables extending downwardly from the winding drum, each cable extending downwardly and about one said lifting beam sheave of one said pair of lifting beam sheaves, then up-wardly and about an overhead sheave, then downwardly and about another said lifting beam sheave of another pair of lifting beam sheaves adjacent said one pair of sheaves, then upwardly to an end of the cable adjacent the overhead sup-port to prevent swaying and rotation of the lifting beam assembly during operation of the crane and to keep the lifting beam assembly level.
four spaced-apart overhead sheaves on the overhead support, the winding drum being between two pairs of the overhead sheaves;
a lifting beam assembly with four pairs of lifting beam sheaves, the pairs of sheaves being spaced-apart from each other;
load carrying means connected to the lifting beam assembly; and four cables comprising two pairs of adjacent cables extending downwardly from the winding drum, each cable extending downwardly and about one said lifting beam sheave of one said pair of lifting beam sheaves, then up-wardly and about an overhead sheave, then downwardly and about another said lifting beam sheave of another pair of lifting beam sheaves adjacent said one pair of sheaves, then upwardly to an end of the cable adjacent the overhead sup-port to prevent swaying and rotation of the lifting beam assembly during operation of the crane and to keep the lifting beam assembly level.
2. A mechanism as claimed in claim 1, each said pair of the lifting beam sheaves being on an arm of a cross.
3. A mechanism as claimed in claim 1, the cables of each said pair of cables extending downwardly to different said lifting beam sheaves on one said arm of the cross, then upwardly to adjacent said overhead sheaves and then down-wardly to lifting beam sheaves on opposite arms of the cross.
4. A mechanism as claimed in claim 3 comprising means for adjusting the lengths of the cables.
5. A mechanism as claimed in claim 4, the means for adjusting comprising four tensioning sheaves rotatably connected to the overhead support, the cables each extending over one said tensioning sheave near said end of each cable, and a threaded connector connecting said end of each said cable to the overhead support.
6. A mechanism as claimed in claim 1, the lif-ting beam assembly having a bottom, the load carrying means being pivotally connected to the bottom of the lifting beam assembly.
7. A mechanism as claimed in claim 6, the load carrying means being pivotally connected to the lifting beam assembly by a double articulated connector for pivoting about perpendicular, horizontal axes.
8. A mechanism as claimed in claim 7, the load carrying means being rotatably connected to the lifting beam assembly for rotation about a vertical axis.
9. A mechanism as claimed in claim 8, the load carrying means comprising a grapple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000344842A CA1153339A (en) | 1980-01-31 | 1980-01-31 | Anti-sway, anti-rotation mechanism for crane reeving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000344842A CA1153339A (en) | 1980-01-31 | 1980-01-31 | Anti-sway, anti-rotation mechanism for crane reeving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153339A true CA1153339A (en) | 1983-09-06 |
Family
ID=4116151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000344842A Expired CA1153339A (en) | 1980-01-31 | 1980-01-31 | Anti-sway, anti-rotation mechanism for crane reeving |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1153339A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111170163A (en) * | 2019-12-30 | 2020-05-19 | 成都西部泰力智能设备股份有限公司 | Grab bucket hoisting apparatus |
| CN118324031A (en) * | 2024-06-17 | 2024-07-12 | 新乡市百分百机电有限公司 | Anti-swing lifting device for crane and operation method thereof |
-
1980
- 1980-01-31 CA CA000344842A patent/CA1153339A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111170163A (en) * | 2019-12-30 | 2020-05-19 | 成都西部泰力智能设备股份有限公司 | Grab bucket hoisting apparatus |
| CN118324031A (en) * | 2024-06-17 | 2024-07-12 | 新乡市百分百机电有限公司 | Anti-swing lifting device for crane and operation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |