CN211004294U - Speed-increasing telescopic mechanism of crane boom - Google Patents
Speed-increasing telescopic mechanism of crane boom Download PDFInfo
- Publication number
- CN211004294U CN211004294U CN201922111366.7U CN201922111366U CN211004294U CN 211004294 U CN211004294 U CN 211004294U CN 201922111366 U CN201922111366 U CN 201922111366U CN 211004294 U CN211004294 U CN 211004294U
- Authority
- CN
- China
- Prior art keywords
- arm
- wire rope
- driven
- steel wire
- winding block
- 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.)
- Active
Links
Images
Landscapes
- Jib Cranes (AREA)
Abstract
The utility model provides an acceleration telescopic mechanism of a crane boom; the winding device comprises a telescopic oil cylinder, a pulley assembly, a winding assembly, an extending steel wire rope and a retracting steel wire rope, wherein a cylinder body of the telescopic oil cylinder is fixed on a main knuckle arm, the extending pulley and the retracting pulley of the pulley assembly are supported on a base, and the base of the pulley assembly is fixedly connected with the end part of a piston rod of the telescopic oil cylinder; a first transmission winding block and a second transmission winding block of the winding component are respectively and fixedly connected to the side walls of the two-section arms; one end of the retraction steel wire rope is fixed on the main joint arm, and the other end of the retraction steel wire rope bypasses a retraction pulley and a first transmission winding block of the pulley assembly and is fixed on the main joint arm; one end of the extending steel wire rope is fixed on the main joint arm of the crane boom, and the other end of the extending steel wire rope bypasses the extending pulley of the pulley assembly and the second transmission winding block and is fixed on the main joint arm. The beneficial technical effects are as follows: the requirement of light-weight and quick hoisting of the engineering machinery under partial working conditions is met, the telescopic speed of the crane boom is increased, and the weight potential of the telescopic mechanism is reduced.
Description
Technical Field
The utility model relates to an acceleration rate telescopic machanism of jib loading boom.
Background
At present, at home and abroad, taking a crane boom on a truck crane as an example, a telescopic mechanism in the crane boom is generally placed in an innermost boom cylinder, a two-section boom is directly connected with a telescopic cylinder and synchronously extends and retracts with the cylinder, the telescopic speed of the telescopic cylinder in the telescopic mechanism is generally consistent with the telescopic speed of the telescopic cylinder in the telescopic mechanism, and the telescopic mechanism is generally longer in length and heavy in weight according to the telescopic length of the crane boom. In partial use working conditions, if the excavator is provided with a crane boom for forest grabbing and hanging operation in a forest farm, the telescopic speed of the crane boom greatly influences the operation efficiency of grabbing forest trees, and the self weight of the crane boom also influences the weight of grabbing and hanging forest trees.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a acceleration rate telescopic machanism of jib loading boom that increases the flexible speed of jib loading boom, alleviates the weight of jib loading boom is provided.
In order to solve the technical problem, the utility model provides an acceleration telescopic mechanism of a crane boom;
the telescopic crane boom comprises a telescopic oil cylinder, a pulley assembly, a winding assembly, an extending steel wire rope and a retracting steel wire rope, wherein a cylinder body of the telescopic oil cylinder is fixedly connected to a main section arm of a crane boom, a piston rod of the telescopic oil cylinder extends out to the initial end of the main section arm, the direction of the piston rod of the telescopic oil cylinder is consistent with the telescopic direction of the crane boom, the pulley assembly comprises a base, at least one extending pulley and at least one retracting pulley, the extending pulley and the retracting pulley are both supported on the base, and the base of the pulley assembly is fixedly connected with the end part of the piston rod of;
the winding assembly comprises a first transmission winding block and a second transmission winding block, and the first transmission winding block and the second transmission winding block are respectively and fixedly connected to the side walls of the two sections of the crane boom;
one end of a retraction steel wire rope is fixed on a main section arm of the crane boom, the other end of the retraction steel wire rope bypasses a retraction pulley of the pulley assembly and a first transmission winding block on the two section arm and is fixed on the main section arm of the crane boom, and the retraction steel wire rope extends into or out of the main section arm from the tail end position of the main section arm of the crane boom to be matched with the first transmission winding block on the two section arm;
one end of the extending steel wire rope is fixed on a main joint arm of the crane boom, the other end of the extending steel wire rope rounds an extending pulley of the pulley assembly and a second transmission winding block on the second joint arm and is fixed on the main joint arm of the crane boom, and the extending steel wire rope extends into or out of the main joint arm from the starting position of the main joint arm of the crane boom to be matched with the second transmission winding block on the second joint arm.
After the structure is adopted, the telescopic oil cylinder is arranged externally, and the multiplying power conversion of the pulleys is adopted, so that the synchronous telescopic speed of the two sections of the crane jib is the geometric multiplying power of the telescopic oil cylinder, the telescopic speed of the crane jib can be increased, the weight of the crane jib is reduced, and the working efficiency of the crane jib is greatly improved.
The utility model discloses beneficial technological effect does: the requirement of light weight and quick hoisting of the engineering machinery under partial working conditions is met, the telescopic speed of the crane boom is increased by the speed-increasing telescopic mechanism of the crane boom, and the weight potential of the telescopic mechanism is reduced.
The winding component of the speed-increasing telescopic mechanism of the crane boom further comprises a first fixed winding block and a second fixed winding block, the first fixed winding block is fixedly connected to the tail end of the main knuckle arm of the crane boom, and the retraction steel wire rope extends into or out of the main knuckle arm by bypassing the first fixed winding block to be matched with a first transmission winding block on the second knuckle arm;
the second fixed winding block is fixedly connected to the starting end of the main knuckle arm of the crane boom, and the extending steel wire rope extends into or out of the main knuckle arm by bypassing the second fixed winding block to be matched with the second transmission winding block on the second knuckle arm.
After the structure is adopted, the friction between the retracting steel wire rope and the extending steel wire rope relative to the two sections of arms can be reduced by the first fixed winding block and the second fixed winding block, the service lives of the retracting steel wire rope and the extending steel wire rope are prolonged, and the stability of the speed-increasing telescopic mechanism of the crane boom is improved.
The speed-increasing telescopic mechanism of the crane boom further comprises at least one group of driven assemblies, the driven assemblies and the secondary arms of the crane boom are in one-to-one correspondence, each driven assembly comprises a first driven steel wire rope, a first driven winding block, a second driven steel wire rope and a second driven winding block, the first driven winding block is fixedly connected to the secondary arm corresponding to the driven assembly, and the second driven winding block is fixedly connected to the inner wall of the second layer of the section arm at the outer side of the secondary arm corresponding to the driven assembly;
one end of a first driven steel wire rope is fixed on the knuckle arm of the second layer outside the secondary knuckle arm corresponding to the driven assembly, the first driven steel wire rope extends into the knuckle arm starting end of the first layer outside the secondary knuckle arm corresponding to the driven assembly, bypasses a first driven winding block of the secondary knuckle arm corresponding to the driven assembly, extends out of the knuckle arm starting end of the first layer outside the secondary knuckle arm corresponding to the driven assembly, and the other end of the first driven steel wire rope is also fixed on the knuckle arm of the second layer outside the secondary knuckle arm corresponding to the driven assembly;
one end of a second driven steel wire rope is fixed on the secondary arm corresponding to the driven assembly, the second driven steel wire rope extends into the tail end of the first layer of the outer side of the secondary arm corresponding to the driven assembly, bypasses a second driven winding block of the second layer of the outer side of the secondary arm corresponding to the driven assembly, extends out of the tail end of the first layer of the outer side of the secondary arm corresponding to the driven assembly, and the other end of the second driven steel wire rope is also fixed on the secondary arm corresponding to the driven assembly.
After the structure is adopted, the driven assembly can drive the secondary section arms of the rest crane arms to synchronously extend or retract along with the two section arms.
A main section arm of the speed-increasing telescopic mechanism of the crane boom is provided with a rail which is in sliding fit with a base of the pulley assembly, and the trend of the rail is consistent with the telescopic direction of the telescopic oil cylinder.
After adopting such structure, the moving track of pulley assembly's base is restricted, strengthens telescopic machanism's stability.
Drawings
Fig. 1 is a perspective view of an embodiment of the speed-increasing telescopic mechanism of the boom.
Fig. 2 is a second perspective view of the embodiment of the speed-increasing telescopic mechanism of the boom.
Fig. 3 is a third perspective view of the embodiment of the speed-increasing telescopic mechanism of the boom.
Fig. 4 is a fourth perspective view of the embodiment of the speed-increasing telescopic mechanism of the boom.
Fig. 5 is a fifth perspective view of the embodiment of the speed-increasing telescopic mechanism of the boom.
Detailed Description
As shown in fig. 1 to 5 (for clear understanding of the internal structure of the speed-increasing telescopic mechanism of the boom, the main knuckle arm 51 is omitted in fig. 2, the main knuckle arm 51 and the retracting wire rope 6 are omitted in fig. 3, the main knuckle arm 51 and the extending wire rope 7 are omitted in fig. 4, and the main knuckle arm 51, the two-knuckle arm 52, the telescopic cylinder 1, the pulley assembly, the winding assembly, the extending wire rope 7 and the retracting wire rope 6 are omitted in fig. 5).
The crane boom of the crane in the embodiment comprises a main joint arm 51, a two-joint arm 52 and two secondary joint arms, wherein the two-joint arm 52 is sleeved in the main joint arm 51, the two secondary joint arms are sequentially sleeved in the two-joint arm 52, and the two secondary joint arms are respectively a three-joint arm 53 and a four-joint arm 54.
The speed-increasing telescopic mechanism of the crane boom comprises a telescopic oil cylinder 1, pulley assemblies, winding assemblies, an extending steel wire rope 7, a retracting steel wire rope 6 and two groups of driven assemblies.
The cylinder body of the telescopic oil cylinder 1 is fixed on a main knuckle arm 51 of a cargo boom, a piston rod of the telescopic oil cylinder 1 extends out to the starting end of the main knuckle arm 51, and the direction of the piston rod of the telescopic oil cylinder 1 is consistent with the telescopic direction of the cargo boom.
The pulley assembly comprises a base 21, four extending pulleys 22 and four retracting pulleys 23, wherein the four extending pulleys 22 and the four retracting pulleys 23 are supported on the base 21, the four extending pulleys 22 are arranged side by side, the four extending pulleys 22 are located at the positions, close to the initial end of the main joint arm 51, of the base 21, the four retracting pulleys 23 are arranged side by side, the four retracting pulleys 23 are located at the positions, close to the tail end of the main joint arm 51, of the base 21 of the pulley assembly and the end portion of a piston rod of the telescopic oil cylinder 1 are welded and fixed, a rail 24 in sliding fit with the base 21 of the pulley assembly is arranged on the main joint arm 51, and the trend of the rail 24 is consistent with the telescopic direction of the.
The winding assembly comprises a first transmission winding block 31, a second transmission winding block 32, a first fixed winding block 33 and a second fixed winding block 34, the first transmission winding block 31 and the second transmission winding block 32 are respectively fixed on the side wall of a second knuckle arm 52 of the crane boom, guide grooves matched with steel wires are respectively formed in the first transmission winding block 31 and the second transmission winding block 32, the first transmission winding block 31 is close to the tail end position of the second knuckle arm 52, and the second transmission winding block 32 is close to the starting end position of the second knuckle arm 52 compared with the first transmission winding block 31.
The first fixed winding block 33 is welded at the tail end of a main knuckle arm 51 of the crane boom, and the retraction steel wire rope 6 extends into or out of the main knuckle arm 51 by winding the first fixed winding block 33 to be matched with a first transmission winding block 31 on a second knuckle arm 52.
The second fixed winding block 34 is welded at the beginning of the main knuckle arm 51 of the crane boom, and the extension steel wire rope 7 extends into or out of the main knuckle arm 51 by winding the second fixed winding block 34 to be matched with the second transmission winding block 32 on the second knuckle arm 52.
One end of the retraction steel wire rope 6 is fixed with the main section arm 51 of the crane boom, and the other end of the retraction steel wire rope 6 bypasses the extension pulley 22 of the pulley assembly and the first transmission winding block 31 on the two-section arm 52 and is fixed on the main section arm 51 of the crane boom;
the winding sequence of the retraction steel wire rope 6 is that after the end part of the retraction steel wire rope 6 is wound around one of the four retraction pulleys 23, the end part of the retraction steel wire rope 6 is wound around a first fixed winding block 33, the end part of the retraction steel wire rope 6 is wound around a second retraction pulley 23 of the four retraction pulleys 23, then the end part of the retraction steel wire rope 6 is extended into the main joint arm 51 from the tail end position of the main joint arm 51 of the crane boom through the first fixed winding block 33, the main joint arm 51 is extended out from the tail end position of the main joint arm 51 of the crane boom after being wound around the first transmission winding block 31, the end part of the retraction steel wire rope 6 is wound back around a third retraction pulley 23 of the four retraction pulleys 23 after passing through the first fixed winding block 33, and the retraction pulley 23 of the four retraction pulleys 23, and finally the retraction steel wire rope 6 is fixed on the main joint arm 51 of the.
One end of the extending steel wire rope 7 is fixed on a main section arm 51 of the crane boom, and the other end of the extending steel wire rope 7 bypasses a retraction pulley 23 of the pulley assembly and a second transmission winding block 32 on a second section arm 52 and is fixed on the main section arm 51 of the crane boom;
the winding sequence of the extended steel wire rope 7 is that after the end part of the extended steel wire rope 7 passes around one of the four extended pulleys 22, the end part of the extended steel wire rope 7 passes around the second fixed winding block 34, the end part of the extended steel wire rope 7 passes around the second extended pulley 22 of the four extended pulleys 22, then the end part of the extended steel wire rope 7 passes through the second fixed winding block 34 and extends into the main joint arm 51 from the tail end position of the main joint arm 51 of the crane boom, then the end part of the extended steel wire rope 7 passes through the second fixed winding block 34 and extends out of the main joint arm 51 of the crane boom, after the end part of the extended steel wire rope 7 passes through the second fixed winding block 32, the end part of the extended steel wire rope is wound back to the third extended pulley 22 of the four extended pulleys 22, and the end of the extended steel wire rope 7 passes through the second fixed winding block 34 and the fourth extended pulley.
The three-section arm 53 of the crane boom is sleeved in the two-section arm 52 of the crane boom, the four-section arm 54 of the crane boom is sleeved in the three-section arm 53 of the crane boom, the driven assemblies and the secondary section arms of the crane boom are in one-to-one correspondence, the two groups of driven assemblies have the same structure, and the specific structure of the driven assemblies is as follows by taking the driven assemblies corresponding to the three-section arm 53 as an example:
the driven assembly comprises a first driven wire rope 41, a first driven winding block 43, a second driven wire rope 42 and a second driven winding block, wherein the first driven winding block 43 is bolted on the side wall of the three-section arm 53, and the second driven winding block (not shown in the figure) is bolted on the inner wall of the main section arm 51.
One end of a first driven wire rope 41 is fixed on the main joint arm 51, the first driven wire rope 41 extends from the starting end of the second joint arm 52, bypasses a first driven winding block 43 of the third joint arm 53 and then extends from the starting end of the second joint arm 52, and the other end of the first driven wire rope 41 is also fixed on the main joint arm 51;
one end of the second driven wire rope 42 is fixed on the three-section arm 53, the second driven wire rope 42 extends into the end of the two-section arm 52, bypasses the second driven winding block of the main section arm 51 and then extends out of the end of the two-section arm 52, and the other end of the second driven wire rope 42 is also fixed on the three-section arm 53.
When the cargo boom needs to be extended, the piston rod of the telescopic oil cylinder 1 retracts, the base 21 of the pulley assembly moves along with the extension, the extending steel wire rope 7 pulls the second transmission winding block 32, the two-section arm 52 extends relative to the main section arm 51, and the steel wire rope pulls the four extending pulleys 22 to wind, so that the stroke of the piston rod of the telescopic oil cylinder 1 and the stroke of the two-section arm 52 have a geometric multiplying power relationship; meanwhile, the driven assembly drives the three-section arm 53 and the four-section arm 54 to synchronously extend, and the real-time extending stroke of the three-section arm 53 and the four-section arm 54 is the same as the extending stroke of the two-section arm 52.
Similarly, when the crane boom needs to retract, the piston rod of the telescopic oil cylinder 1 extends out, the base 21 of the pulley assembly moves along with the telescopic oil cylinder, the retraction steel wire rope 6 pulls the first transmission winding block 31, the second-section arm 52 retracts relative to the main-section arm 51, and the stroke of the piston rod of the telescopic oil cylinder 1 and the stroke of the second-section arm 52 have a geometric multiplying power relationship; the driven assembly drives the three-section arm 53 and the four-section arm 54 to retract synchronously, and the retraction real-time stroke of the three-section arm 53 and the four-section arm 54 is the same as the retraction stroke of the two-section arm 52.
The above description is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and improvements can be made without departing from the principle of the present invention, and these should also be considered as belonging to the protection scope of the present invention.
Claims (4)
1. A speed-increasing telescopic mechanism of a cargo boom is characterized in that:
the telescopic crane boom comprises a telescopic oil cylinder, a pulley assembly, a winding assembly, an extending steel wire rope and a retracting steel wire rope, wherein a cylinder body of the telescopic oil cylinder is fixedly connected to a main section arm of a crane boom, a piston rod of the telescopic oil cylinder extends out to the initial end of the main section arm, the direction of the piston rod of the telescopic oil cylinder is consistent with the telescopic direction of the crane boom, the pulley assembly comprises a base, at least one extending pulley and at least one retracting pulley, the extending pulley and the retracting pulley are both supported on the base, and the base of the pulley assembly is fixedly connected with the end part of the piston rod of;
the winding assembly comprises a first transmission winding block and a second transmission winding block, and the first transmission winding block and the second transmission winding block are respectively and fixedly connected to the side walls of the two sections of the crane boom;
one end of a retraction steel wire rope is fixed on a main section arm of the crane boom, the other end of the retraction steel wire rope bypasses a retraction pulley of the pulley assembly and a first transmission winding block on the two section arm and is fixed on the main section arm of the crane boom, and the retraction steel wire rope extends into or out of the main section arm from the tail end position of the main section arm of the crane boom to be matched with the first transmission winding block on the two section arm;
one end of the extending steel wire rope is fixed on a main joint arm of the crane boom, the other end of the extending steel wire rope rounds an extending pulley of the pulley assembly and a second transmission winding block on the second joint arm and is fixed on the main joint arm of the crane boom, and the extending steel wire rope extends into or out of the main joint arm from the starting position of the main joint arm of the crane boom to be matched with the second transmission winding block on the second joint arm.
2. The speed-increasing telescopic mechanism of the boom of claim 1, wherein:
the winding assembly further comprises a first fixed winding block and a second fixed winding block, the first fixed winding block is fixedly connected to the tail end of the main section arm of the crane boom, and the retraction steel wire rope extends into or out of the main section arm by bypassing the first fixed winding block to be matched with a first transmission winding block on the second section arm;
the second fixed winding block is fixedly connected to the starting end of the main knuckle arm of the crane boom, and the retraction steel wire rope extends into or out of the main knuckle arm by bypassing the second fixed winding block to be matched with the second transmission winding block on the second knuckle arm.
3. The speed-increasing telescopic mechanism of the boom of claim 1, wherein:
the crane boom is characterized by further comprising at least one group of driven assemblies, the driven assemblies are in one-to-one correspondence with the secondary arms of the crane boom, each driven assembly comprises a first driven steel wire rope, a first driven winding block, a second driven steel wire rope and a second driven winding block, the first driven winding block is fixedly connected to the secondary arm corresponding to the driven assembly, and the second driven winding block is fixedly connected to the inner wall of the second layer of the secondary arm outside the secondary arm corresponding to the driven assembly;
one end of a first driven steel wire rope is fixed on the knuckle arm of the second layer outside the secondary knuckle arm corresponding to the driven assembly, the first driven steel wire rope extends into the knuckle arm starting end of the first layer outside the secondary knuckle arm corresponding to the driven assembly, bypasses a first driven winding block of the secondary knuckle arm corresponding to the driven assembly, extends out of the knuckle arm starting end of the first layer outside the secondary knuckle arm corresponding to the driven assembly, and the other end of the first driven steel wire rope is also fixed on the knuckle arm of the second layer outside the secondary knuckle arm corresponding to the driven assembly;
one end of a second driven steel wire rope is fixed on the secondary arm corresponding to the driven assembly, the second driven steel wire rope extends into the tail end of the first layer of the outer side of the secondary arm corresponding to the driven assembly, bypasses a second driven winding block of the second layer of the outer side of the secondary arm corresponding to the driven assembly, extends out of the tail end of the first layer of the outer side of the secondary arm corresponding to the driven assembly, and the other end of the second driven steel wire rope is also fixed on the secondary arm corresponding to the driven assembly.
4. The speed-increasing telescopic mechanism of the boom of claim 1, wherein:
the main section arm is provided with a track which is in sliding fit with the base of the pulley assembly, and the trend of the track is consistent with the telescopic direction of the telescopic oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922111366.7U CN211004294U (en) | 2019-11-30 | 2019-11-30 | Speed-increasing telescopic mechanism of crane boom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922111366.7U CN211004294U (en) | 2019-11-30 | 2019-11-30 | Speed-increasing telescopic mechanism of crane boom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211004294U true CN211004294U (en) | 2020-07-14 |
Family
ID=71508188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922111366.7U Active CN211004294U (en) | 2019-11-30 | 2019-11-30 | Speed-increasing telescopic mechanism of crane boom |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211004294U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110745721A (en) * | 2019-11-30 | 2020-02-04 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
-
2019
- 2019-11-30 CN CN201922111366.7U patent/CN211004294U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110745721A (en) * | 2019-11-30 | 2020-02-04 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
| CN110745721B (en) * | 2019-11-30 | 2024-04-19 | 安徽柳工起重机有限公司 | Speed-increasing telescopic mechanism of crane boom |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201214601Y (en) | Main arm telescopic mechanism for crane | |
| CN202080842U (en) | Crane and multi-arm telescoping mechanism thereof | |
| CN107500170B (en) | Pulley lifting system and drilling platform thereof | |
| CN212421354U (en) | Synchronous telescoping device of multisection arm | |
| CN211004294U (en) | Speed-increasing telescopic mechanism of crane boom | |
| CN102878165B (en) | Telescopic boom and engineering machinery | |
| CN111452087A (en) | Synchronous telescoping device of multisection arm | |
| CN206970063U (en) | A kind of crane five-stage telescopic boom | |
| CN210127069U (en) | Lifting mechanism and aerial work platform using same | |
| CN202481966U (en) | Suspension arm of crane | |
| CN202465132U (en) | Seven-section arm body expanding and retracting system | |
| CN212503696U (en) | Telescopic boom structure, operation boom and engineering machinery | |
| CN110745721B (en) | Speed-increasing telescopic mechanism of crane boom | |
| CN202379623U (en) | Hoisting mechanism and reach stacker | |
| WO2023159752A1 (en) | Single-cylinder multi-section boom telescopic mechanism, boom and crane | |
| CN109678070B (en) | Movable counterweight realizing mechanism of movable arm tower crane | |
| CN202011707U (en) | Synchronous arm-body telescopic device with single cylinder and sets of inhaul cables of lorry-mounted crane | |
| WO2011124122A1 (en) | Telescoping jib mechanism of crane | |
| CN206307929U (en) | A kind of joint arm telescoping mechanism of single telescopic oil cylinder five for carrying guiding | |
| CN201825675U (en) | System for single cylinder and three stay ropes to drive arm bodies of lorry-mounted crane to retract synchronously | |
| CN209890123U (en) | Telescopic arm telescopic device of lorry-mounted crane | |
| CN115043336A (en) | Multi-pulley telescopic mechanism and crane | |
| CN204138216U (en) | The boom telescoping device of car hosit | |
| CN112607678A (en) | Four-section arm telescopic mechanism of overhead working truck | |
| CN203048457U (en) | Dual-cylinder-driven three-pull-rope-set arm body telescoping system of small-tonnage straight-arm lorry-mounted crane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |