CN112062012A - Flexible arm of lorry-mounted crane system that stretches out in proper order - Google Patents
Flexible arm of lorry-mounted crane system that stretches out in proper order Download PDFInfo
- Publication number
- CN112062012A CN112062012A CN202011053051.2A CN202011053051A CN112062012A CN 112062012 A CN112062012 A CN 112062012A CN 202011053051 A CN202011053051 A CN 202011053051A CN 112062012 A CN112062012 A CN 112062012A
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- China
- Prior art keywords
- telescopic
- pressure
- boom
- limiting valve
- arm
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- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/03—Cranes with arms or jibs; Multiple cranes
- B66C2700/0392—Movement of the crane arm; Coupling of the crane arm with the counterweights; Safety devices for the movement of the arm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/783—Sequential control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Jib Cranes (AREA)
Abstract
The invention relates to a sequential stretching system for telescopic arms of a lorry-mounted crane, which comprises a plurality of stages of telescopic arms arranged from thick to thin, wherein each stage of telescopic arm is driven by a telescopic oil cylinder corresponding to the stage of telescopic arm, rodless cavities of the telescopic oil cylinders are connected in series, and a pressure limiting valve is arranged on an oil return path with a rod cavity of the telescopic oil cylinder corresponding to the second stage and the next telescopic arms. Compared with the prior art, the invention improves the starting value of the rear arm through the pressure limiting valve, and ensures that the front arm extends 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 invention belongs to the technical field of a vehicle-mounted crane, and particularly relates to a sequential extending system for telescopic arms of the vehicle-mounted crane.
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.
Disclosure of Invention
The invention aims to provide a sequential extending system of a telescopic arm of a lorry-mounted crane. 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 invention can be realized by 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 rodless cavities of the telescopic oil cylinders are connected in series, so that the pressure in the rodless cavities of the telescopic oil cylinders is ensured to be equal when oil is fed. 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 invention has the following beneficial effects:
(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 telescopic arm of the crane can generate larger deformation when hoisting heavy load, and in order to enable the telescopic arm to extend out as required, the connecting hole of the piston rod of the telescopic oil cylinder and the telescopic arm is designed to be a waist-shaped hole, so that the deformation of the telescopic arm can not bring influence on the deformation of the piston rod.
(3) The invention has simple structure and convenient arrangement.
Drawings
Fig. 1 is a schematic structural view of a sequential extending system of a telescopic boom of a truck crane according to the present invention.
Fig. 2 is a schematic top view of the system for sequentially extending the telescopic boom of the crane according to the present invention.
Fig. 3 is a schematic structural view of a port of the system for sequentially extending the telescopic boom of the truck crane.
FIG. 4 is a schematic view of the connection of the telescopic cylinder according to 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 invention is described in detail below with reference to the figures 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: in the invention, the end of the telescopic arm is provided with a mounting hole 8 of a telescopic oil cylinder and/or a mounting hole of a piston rod 6 of the telescopic oil 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 telescopic arm of the crane can generate larger deformation when hoisting heavy load, and in order to enable the telescopic arm to extend out as required, the connecting hole of the piston rod of the telescopic oil cylinder and the telescopic arm is designed to be a waist-shaped hole, so that the deformation of the telescopic arm can not bring influence on the deformation of the piston rod. 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 based on 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 stretching out the telescopic arms of the lorry-mounted crane as claimed in claim 1, wherein the maximum pressure of the self weight of the front 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 rear 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 mobile crane jib 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 rod-free cavity (91) of the primary telescopic cylinder (3) and the rod-free cavity (91) of the secondary telescopic cylinder (4) are connected in series, and a pressure limiting valve (5) is arranged on an oil return path (93) of the rod-containing cavity (92) of the secondary telescopic cylinder (4).
6. A sequentially extending system of telescopic boom of truck crane as claimed in 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 system as claimed in claim 6, characterized in that the pressure-limiting valve (5) of the secondary telescopic cylinder (4) is adapted to open the 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. A sequentially extending system of a telescopic boom of a lorry-mounted crane as claimed in claim 1, characterized in that the end of the telescopic 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 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 |
|---|---|---|---|
| CN202011053051.2A CN112062012A (en) | 2020-09-29 | 2020-09-29 | Flexible arm of lorry-mounted crane system that stretches out in proper order |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011053051.2A CN112062012A (en) | 2020-09-29 | 2020-09-29 | Flexible arm of lorry-mounted crane system that stretches out in proper order |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112062012A true CN112062012A (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011053051.2A Pending CN112062012A (en) | 2020-09-29 | 2020-09-29 | Flexible arm of lorry-mounted crane system that stretches out in proper order |
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| CN (1) | CN112062012A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 CN202011053051.2A patent/CN112062012A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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