CN212356336U - Sequential extending system for telescopic arm of crane - Google Patents
Sequential extending system for telescopic arm of crane Download PDFInfo
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- CN212356336U CN212356336U CN202022189413.2U CN202022189413U CN212356336U CN 212356336 U CN212356336 U CN 212356336U CN 202022189413 U CN202022189413 U CN 202022189413U CN 212356336 U CN212356336 U CN 212356336U
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Abstract
The utility model relates to a flexible arm order of lorry-mounted crane stretches out system, including the multistage flexible arm that sets up from thick to thin, every flexible arm is by the flexible hydro-cylinder drive that this level of flexible arm corresponds, and the rodless chamber of each flexible hydro-cylinder is established ties, and the flexible hydro-cylinder that the flexible arm after the second grade reaches corresponds has the pole chamber to return and is equipped with the pressure-limiting valve on the oil circuit. Compared with the prior art, the utility model improves the starting value of the rear arm through the pressure limiting valve, and ensures that the front arm is extended out preferentially; therefore, the telescopic boom can be stretched out preferentially by a thicker section when stretching out at each time, the safety and reliability in the stretching out process are greatly improved, and the telescopic boom is simple in structure and convenient to arrange.
Description
Technical Field
The utility model belongs to the technical field of the vehicle-mounted loop wheel machine, especially, relate to a flexible arm of vehicle-mounted loop wheel machine stretches out system in proper order.
Background
In order to meet the requirements of the working surface of a crane truck and a wrecker, a lifting arm of a lorry-mounted crane usually adopts a structure of a plurality of sections of telescopic arms, the lifting arm belongs to a cantilever type structure in the lifting process, and the telescopic arms are required to be stretched out from large to small according to the thickness of the telescopic arms when the telescopic arms are stretched out in consideration of lifting safety and reliability. At present, most of telescopic arms of the crane on the market extend out in a disordered manner in the extending process, the extending sequence depends on the extending friction force of each section of telescopic arm, and the section of telescopic arm with small friction force extends out firstly. The extending mode can meet the lifting requirement functionally, but the safety and the reliability are not considered thoroughly.
Chinese patent CN108249324A discloses a sequential telescopic mechanism of crane jib, which controls sequential telescopic of a first telescopic cylinder and a second telescopic cylinder through a sequential valve and a hydraulic control sequential valve, wherein the sequential valve is opened and closed through a collision block and whether the collision block presses on a collision needle, and whether the collision block presses on the hydraulic control sequential valve is determined by whether the second telescopic cylinder extends out. However, the structure is complex, the safety of the whole system is reduced, and the mechanical triggering structure is inconvenient to arrange on the telescopic oil cylinder.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flexible arm of vehicle-mounted loop wheel machine stretches out system in proper order. The starting value of the rear arm is improved through the pressure limiting valve, and the front arm is guaranteed to be extended out preferentially; therefore, the telescopic boom can be stretched out preferentially by a thicker section when stretching out at each time, the safety and reliability in the stretching out process are greatly improved, and the telescopic boom is simple in structure and convenient to arrange.
The purpose of the utility model can be realized through the following technical scheme:
a sequential stretching system for telescopic arms of a lorry-mounted crane comprises multiple stages of telescopic arms arranged from thick to thin, each stage of telescopic arm is driven by a telescopic oil cylinder corresponding to the telescopic arm, rodless cavities of the telescopic oil cylinders are connected in series, and pressure limiting valves are arranged on rod cavity oil return paths of the telescopic oil cylinders corresponding to the telescopic arms at the second stage and later.
Preferably, in the system, the maximum pressure of the self weight of the previous stage telescopic boom to the telescopic cylinder piston corresponding to the telescopic boom is less than the opening pressure of a given pressure limiting valve on the pressure limiting valve of the telescopic cylinder corresponding to the next stage telescopic boom.
Preferably, the pressure limiting valve is used for opening the return oil when the pressure in the rod cavity is larger than the opening pressure of the given pressure limiting valve.
Preferably, the rodless cavities of the telescopic oil cylinders are simultaneously fed with oil.
Preferably, the system consists of a primary telescopic arm and a secondary telescopic arm which are arranged from thick to thin, the primary telescopic arm is driven by a primary telescopic oil cylinder, the secondary telescopic arm is driven by a secondary telescopic oil cylinder, rodless cavities of the primary telescopic oil cylinder and the secondary telescopic oil cylinder are connected in series, and a pressure limiting valve is arranged on a rod cavity oil return path of the secondary telescopic oil cylinder.
Preferably, in the system, the maximum pressure of the self weight of the primary telescopic arm on the piston of the primary telescopic oil cylinder is less than the opening pressure of a given pressure limiting valve on the pressure limiting valve of the secondary telescopic oil cylinder.
Preferably, the pressure limiting valve of the secondary telescopic oil cylinder is used for opening oil return when the pressure in the rod cavity of the secondary telescopic oil cylinder is greater than the opening pressure of the given pressure limiting valve.
Preferably, the end of the telescopic arm is provided with a mounting hole 8 of the telescopic oil cylinder and/or a mounting hole of the piston rod 6 of the telescopic oil cylinder.
Preferably, the mounting hole of the piston rod is a kidney-shaped movable hole.
Preferably, the two semicircular arcs of the kidney-shaped movable hole are arranged one above the other.
The utility model discloses the rodless chamber of each flexible hydro-cylinder is established ties, and the pressure equals when guaranteeing the rodless intracavity of flexible hydro-cylinder oil feed. And a pressure limiting valve is arranged on a rod cavity oil return path of the telescopic oil cylinder corresponding to the second-stage and later telescopic arms, and oil return can be opened only when the pressure in the rod cavity is greater than a pressure limiting value. So as to ensure that the upper-level (thicker telescopic arm) telescopic arm extends out preferentially.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the starting value of the rear-stage (thinner) telescopic boom is improved through the pressure limiting valve, and the upper-stage (thicker telescopic boom) telescopic boom is ensured to be preferentially stretched out, so that a thicker section of telescopic boom is preferentially stretched out when the telescopic boom is stretched out every time, the telescopic boom is sequentially stretched out, and the safety and reliability in the stretching process are greatly improved.
(2) The flexible arm of loop wheel machine can take place great deformation when hoist and mount heavy load, stretches out for making flexible arm as required, the utility model discloses the connecting hole design of flexible hydro-cylinder piston rod and flexible arm is waist type hole, makes the deformation of flexible arm can not bring the influence on the deformation for the piston rod like this.
(3) The utility model discloses simple structure arranges the convenience.
Drawings
Fig. 1 is a schematic view of the structure of the telescopic boom sequential extension system of the truck-mounted crane of the present invention.
Fig. 2 is a schematic view of the overlooking structure of the sequential extending system of the telescopic boom of the truck-mounted crane of the present invention.
Fig. 3 is a schematic view of the port structure of the sequential extending system of the telescopic boom of the truck-mounted crane of the present invention.
Fig. 4 is the connection schematic diagram of the telescopic cylinder of the present invention.
In the figure, 1 is a primary telescopic arm, 2 is a secondary telescopic arm, 3 is a primary telescopic oil cylinder, 4 is a secondary telescopic oil cylinder, 5 is a pressure limiting valve, 6 is a piston rod, 7 is a waist-shaped movable hole, 8 is a telescopic oil cylinder mounting hole, 91 is a rodless cavity, 92 is a rod cavity, and 93 is an oil return path.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A sequential stretching system for telescopic arms of a lorry-mounted crane comprises multiple stages of telescopic arms arranged from thick to thin, each stage of telescopic arm is driven by a telescopic oil cylinder corresponding to the telescopic arm, rodless cavities 91 of the telescopic oil cylinders are connected in series, and pressure limiting valves 5 are arranged on oil return paths 93 of rod cavities 92 of the telescopic oil cylinders corresponding to the telescopic arms at the second stage and later. The rodless cavities 91 of the telescopic oil cylinders simultaneously feed oil, so that the pressure in the rodless cavities 91 of the telescopic oil cylinders is equal during oil feeding. Preferably, in the system, the maximum pressure of the self weight of the front-stage telescopic arm on the piston of the telescopic oil cylinder corresponding to the telescopic arm is less than the opening pressure of a given pressure limiting valve on the pressure limiting valve 5 of the telescopic oil cylinder corresponding to the rear-stage telescopic arm. Further preferably, the pressure-limiting valve 5 is used to open the return oil when the pressure in the rod chamber 92 is greater than a given pressure-limiting valve opening pressure.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, for example, a two-section telescopic boom structure is used, the system is composed of a first-stage telescopic boom 1 (the first-stage telescopic boom 1 is arranged in a basic boom) and a second-stage telescopic boom 2 which are arranged from thick to thin, the first-stage telescopic boom 1 is driven by a first-stage telescopic oil cylinder 3, the second-stage telescopic boom 2 is driven by a second-stage telescopic oil cylinder 4, the first-stage telescopic oil cylinder 3 and a rodless cavity 91 of the second-stage telescopic oil cylinder 4 are connected in series, pressure equality in the rodless cavities 91 of the two telescopic oil cylinders during oil inlet is ensured, and a pressure limiting valve 5 is arranged on an oil return path 93 of a rod cavity 92 of the second-stage telescopic oil cylinder. In the system, the maximum pressure of the self weight of a primary telescopic arm 1 to a piston of a primary telescopic oil cylinder 3 is less than the opening pressure of a pressure limiting valve given on a pressure limiting valve 5 of a secondary telescopic oil cylinder 4. The oil return is opened when the pressure in the rod cavity 92 of the two-stage telescopic oil cylinder 4 is larger than the opening pressure of a given pressure limiting valve.
The extension sequence is explained with reference to fig. 4.
(1) A secondary telescopic oil cylinder:
pressure in the rodless cavity: p;
pressure of hoisting load on piston: f;
pressure of the dead weight of the II-stage telescopic arm on the piston: g2;
opening pressure of the pressure limiting valve: q is calculated.
(2) A primary telescopic oil cylinder:
pressure in the rodless cavity: p;
pressure of hoisting load on piston: f;
pressure of the dead weight of the II-stage telescopic arm on the piston: g2;
pressure of I-stage telescopic arm dead weight on a piston: G1.
the starting conditions of the I-stage telescopic arm are as follows: p is more than or equal to F + G1+ G2
The starting conditions of the II-stage telescopic arm are as follows: p is more than or equal to F + G2+ q
The starting condition of the I-grade telescopic arm is only required to be smaller than that of the II-grade telescopic arm to enable the I-grade telescopic arm to extend preferentially.
Namely: f + G1+ G2< F + G2+ q
The priority of extension of the I-stage telescopic arm can be ensured when G1< q is obtained.
Therefore, the telescopic arms extend out sequentially only by ensuring that the maximum pressure of the self weight of the primary telescopic arm 1 to the piston is less than the opening pressure of a given pressure limiting valve in the design process.
The working sequence of the extension arm of the crane in sequence is as follows:
(1) simultaneously feeding oil into rodless cavities of the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder, and controlling the pressure P;
(2) the opening value of the first-stage telescopic arm is lower than that of the second-stage telescopic arm, so that the first-stage telescopic arm extends out preferentially;
(3) when the first-stage telescopic arm extends to the maximum, the oil inlet pressure P of the rodless cavity is continuously increased;
(4) when the pressure P of the rodless cavity is increased to be larger than the starting value of the second-stage telescopic arm, the second-stage arm stretches out.
Further: the utility model discloses in, flexible arm end is equipped with the mounting hole of the piston rod 6 of flexible hydro-cylinder mounting hole 8 and/or flexible hydro-cylinder. For example, in this embodiment, the end of the first stage telescopic boom may be provided with a telescopic cylinder mounting hole 8 of the telescopic cylinder of the present stage and a mounting hole of the piston rod 6 of the previous stage telescopic cylinder, as shown in fig. 2. The mounting hole of the piston rod 6 is preferably a kidney-shaped movable hole 7. The flexible arm of loop wheel machine can take place great deformation when hoist and mount heavy load, stretches out for making flexible arm as required, the utility model discloses the connecting hole design of flexible hydro-cylinder piston rod and flexible arm is waist type hole, makes the deformation of flexible arm can not bring the influence on the deformation for the piston rod like this. The two half-circles of the kidney-shaped movable hole 7 are arranged one above the other as shown in fig. 2, and the kidney-shaped movable hole 7 can play a role in hoisting heavy loads.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (10)
1. The sequential stretching system of the telescopic arms of the lorry-mounted crane is characterized by comprising multiple stages of telescopic arms arranged from thick to thin, each stage of telescopic arm is driven by a telescopic oil cylinder corresponding to the telescopic arm, rodless cavities (91) of the telescopic oil cylinders are connected in series, and pressure limiting valves (5) are arranged on oil return paths (93) of rod cavities (92) of the telescopic oil cylinders corresponding to the telescopic arms at the second stage and later.
2. The system for sequentially extending the telescopic arms of the lorry-mounted crane as claimed in claim 1, wherein the maximum pressure of the self weight of the previous telescopic arm on the piston of the telescopic cylinder corresponding to the telescopic arm is less than the opening pressure of a pressure limiting valve (5) of the telescopic cylinder corresponding to the next telescopic arm.
3. A truck crane boom sequence extension system according to claim 1 or 2, characterized in that said pressure limiting valve (5) is adapted to open a return oil when the pressure in the rod chamber (92) is greater than a given pressure limiting valve opening pressure.
4. The truck mounted crane boom sequential extension system of claim 1, wherein the rodless chambers (91) of each telescoping cylinder are simultaneously fed.
5. The telescopic boom sequential extending system of the lorry-mounted crane according to claim 1, characterized in that the system is composed of a primary telescopic boom (1) and a secondary telescopic boom (2) which are arranged from thick to thin, the primary telescopic boom (1) is driven by a primary telescopic cylinder (3), the secondary telescopic boom (2) is driven by a secondary telescopic cylinder (4), the rodless cavities (91) of the primary telescopic cylinder (3) and the secondary telescopic cylinder (4) are connected in series, and a pressure limiting valve (5) is arranged on an oil return path (93) of a rod cavity (92) of the secondary telescopic cylinder (4).
6. A sequentially extending system of telescopic boom of truck crane according to claim 5, characterized in that, in the system, the maximum pressure of the self weight of the primary telescopic boom (1) to the piston of the primary telescopic cylinder (3) is less than the opening pressure of the pressure limiting valve (5) of the secondary telescopic cylinder (4).
7. A truck crane boom sequential extension system according to claim 6, characterized in that the pressure limiting valve (5) of the secondary telescopic cylinder (4) is adapted to open a return oil when the pressure in the rod chamber (92) of the secondary telescopic cylinder (4) is greater than a given pressure limiting valve opening pressure.
8. The truck mounted crane boom sequential extension system according to claim 1, wherein the end of the boom is provided with a mounting hole (8) for a telescopic cylinder and/or a mounting hole for a piston rod (6) of a telescopic cylinder.
9. A truck crane telescopic boom sequential extension system according to claim 8, characterized in that the mounting hole of the piston rod (6) is a kidney-shaped movable hole (7).
10. A truck crane boom sequential extension system according to claim 9, characterized in that two semi-circular arcs of the kidney-shaped activity hole (7) are arranged one above the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022189413.2U CN212356336U (en) | 2020-09-29 | 2020-09-29 | Sequential extending system for telescopic arm of crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022189413.2U CN212356336U (en) | 2020-09-29 | 2020-09-29 | Sequential extending system for telescopic arm of crane |
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| CN212356336U true CN212356336U (en) | 2021-01-15 |
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| CN202022189413.2U Active CN212356336U (en) | 2020-09-29 | 2020-09-29 | Sequential extending system for telescopic arm of crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062012A (en) * | 2020-09-29 | 2020-12-11 | 上海航天智能装备有限公司 | Flexible arm of lorry-mounted crane system that stretches out in proper order |
| CN113682980A (en) * | 2021-09-06 | 2021-11-23 | 徐州徐工随车起重机有限公司 | Six-section telescopic arm device for folding arm automobile crane |
-
2020
- 2020-09-29 CN CN202022189413.2U patent/CN212356336U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062012A (en) * | 2020-09-29 | 2020-12-11 | 上海航天智能装备有限公司 | Flexible arm of lorry-mounted crane system that stretches out in proper order |
| CN113682980A (en) * | 2021-09-06 | 2021-11-23 | 徐州徐工随车起重机有限公司 | Six-section telescopic arm device for folding arm automobile crane |
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