CN111852971A - Telescopic mechanism hydraulic control system and hoisting equipment applying same - Google Patents
Telescopic mechanism hydraulic control system and hoisting equipment applying same Download PDFInfo
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- CN111852971A CN111852971A CN202010843276.1A CN202010843276A CN111852971A CN 111852971 A CN111852971 A CN 111852971A CN 202010843276 A CN202010843276 A CN 202010843276A CN 111852971 A CN111852971 A CN 111852971A
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- telescopic
- oil
- synchronous
- valve
- hydraulic control
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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
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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
- B66C13/00—Other constructional features or details
- B66C13/12—Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
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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
- F15B11/22—Synchronisation of the movement of two or more servomotors
Abstract
The invention discloses a hydraulic control system of a telescopic mechanism and hoisting equipment applied by the same, wherein the hydraulic control system comprises a synchronous telescopic oil cylinder group and a sequential telescopic oil cylinder; the synchronous telescopic oil cylinder group comprises at least two groups of synchronous telescopic oil cylinders which synchronously perform telescopic action, wherein the same oil cavity in all the synchronous telescopic oil cylinders and the oil cavity corresponding to the sequential telescopic oil cylinder are communicated with each other and are connected to one working oil port of the system reversing valve through a first oil path, the other oil cavity of all the synchronous telescopic oil cylinders and the oil cavity corresponding to the sequential telescopic oil cylinder are respectively connected to the other working oil port of the system reversing valve through a second oil path, the second oil path of the synchronous telescopic oil cylinder and the second oil path of the sequential telescopic oil cylinder are connected to the system reversing valve through a telescopic sequential reversing valve in a tandem manner, and the synchronous valves are arranged on the second oil paths from all the synchronous telescopic oil cylinders to the telescopic sequential reversing. The invention realizes the possibility of the telescopic operation of the telescopic arm of the hoisting equipment in a loading way, and improves the stability and the application range of the operation of the equipment.
Description
Technical Field
The invention relates to a hydraulic telescopic mechanism and application thereof, in particular to a telescopic mechanism hydraulic control system and equipment thereof.
Background
The telescopic mechanism of the telescopic boom crawler crane comprises a single-cylinder rope row telescopic mechanism, a multi-cylinder rope row telescopic mechanism and a single-cylinder bolt telescopic mechanism, the telescopic mechanisms can meet the hoisting operation requirements of users during hoisting, but have a common defect that the telescopic boom is not allowed to be stretched under the condition of hoisting and carrying heavy objects, so that the construction working condition of the telescopic boom crawler crane is limited. When the multifunctional telescopic boom crawler crane is used for down-the-hole hammer operation, the multifunctional telescopic boom crawler crane needs to adapt to construction sites in high slopes, deep grooves and narrow zones, and has the loaded telescopic capacity, which is also significant for general hoisting operation.
For example, in the six-section jib telescopic mechanism of the automobile crane disclosed in the chinese patent application with the application number CN201921430403.4, the telescopic mechanism adopts a mode of an oil cylinder and a steel wire rope pulley, when the rotary drilling rig or the down-the-hole hammer is hoisted by the telescopic mechanism with the structure, the telescopic state is kept by the steel wire rope due to the telescopic force, and the telescopic action of the telescopic arm in a loading manner cannot be controlled due to the large elasticity of the steel wire rope; especially in the drilling construction process of the drill rod, the hoisting steel wire rope telescopic mechanism has large elasticity and low precision of the steel wire rope, when the hoisting steel wire rope is impacted and vibrated, a working device additionally arranged on the suspension arm is easy to displace, and the telescopic mechanism is easy to break, so that the operation quality can not be ensured. Therefore, the traditional telescopic arm mechanism of the oil cylinder and the steel wire rope pulley cannot carry a down-the-hole hammer and an auger to carry out construction operation.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the problem that the existing lifting telescopic mechanism of the oil cylinder and the steel wire rope pulley cannot realize on-load operation, the hydraulic control system of the telescopic mechanism adopting the multi-stage oil cylinder and the lifting equipment applying the hydraulic control system are provided.
The invention is realized by adopting the following technical scheme:
the hydraulic control system of the telescopic mechanism comprises a synchronous telescopic oil cylinder group and a sequential telescopic oil cylinder; the synchronous telescopic oil cylinder group comprises at least two groups of synchronous telescopic oil cylinders which synchronously perform telescopic actions, wherein the same oil cavity in all the synchronous telescopic oil cylinders and the oil cavity corresponding to the sequential telescopic oil cylinder are communicated with each other and are connected to one of the working oil ports of the system reversing valve through a first oil path, the other oil cavity of all the synchronous telescopic oil cylinders and the oil cavity corresponding to the sequential telescopic oil cylinder are respectively connected to the other working oil port of the system reversing valve through a second oil path, the second oil path of the synchronous telescopic oil cylinder and the second oil path of the sequential telescopic oil cylinder are connected to the system reversing valve through a telescopic sequential reversing valve in a tandem manner, and the synchronous valves are arranged on the second oil paths from all the synchronous telescopic oil cylinders to the telescopic sequential reversing valve, so that the synchronous telescopic oil cylinders of the synchronous telescopic oil cylinder group perform synchronous telescopic actions, and the sequential telescopic oil cylinders.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, the inside of the synchronizing valve includes a plurality of pressure passages respectively butted with the second oil passages of the synchronous telescopic cylinders, the pressure passages are communicated by the shuttle valve, and each pressure passage is connected with an oil return bypass of the return oil tank through a two-way cartridge valve.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, the two-way cartridge valve is controlled by a reversing valve which is connected by the oil return bypass, the reversing valve is a two-position electric control reversing valve with a stop position, and the reversing valve is in feedback connection with an in-place travel switch of the synchronous telescopic cylinder.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, an overflow valve is connected beside a control oil path of the reversing valve.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, a pressure passage of the synchronizing valve is provided with a one-way throttle valve.
In the hydraulic control system of the telescopic mechanism, the second oil paths of all the synchronous telescopic oil cylinders are distributed by arranging the shunt motors, the shunt motors are arranged at the oil inlet ends of the synchronous valves, and the flow of hydraulic oil pumped to the synchronous telescopic oil cylinders is uniformly distributed by the shunt motors.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, the synchronous telescopic cylinder and the sequential telescopic cylinder are both provided with a balance valve.
In the hydraulic control system of the telescopic mechanism in the above scheme, further, the telescopic sequence reversing valve is a hydraulic control reversing valve.
The invention also discloses hoisting equipment which comprises a telescopic arm mechanism adopting the hydraulic control system of the telescopic mechanism, wherein the telescopic arm mechanism at least comprises three sections of movable telescopic arms, and each movable telescopic arm is correspondingly arranged with the telescopic oil cylinders in the hydraulic control system of the telescopic mechanism one by one.
In the hoisting device according to the above aspect, preferably, the hoisting device is a telescopic boom crawler crane.
The telescopic mechanism hydraulic control system provided by the invention adopts multiple groups of telescopic oil cylinders to control the telescopic action of the telescopic mechanism, utilizes the multiple groups of synchronous telescopic oil cylinders of the synchronous telescopic oil cylinder group to synchronously telescope and combines the sequential telescopic action of the sequential telescopic oil cylinders, so that the telescopic action speed of the telescopic mechanism is improved, the telescopic control is more accurate, the telescopic work efficiency of the telescopic mechanism is ensured, the problem that the traditional crane telescopic mechanism oil cylinder and steel wire rope mechanism cannot carry to telescope is solved, and the problems that the traditional crane steel wire rope telescopic mechanism is high in elasticity and low in precision are further solved. The multifunctional crawler crane using the telescopic mechanism hydraulic control system can realize that the telescopic boom mechanism carries the down-the-hole hammer and the spiral drill to carry out pile foundation construction operation, reduce the vibration of the telescopic boom in the telescopic working process, avoid the damage of the telescopic mechanism, ensure the operation quality, enlarge the working range of the crawler crane, meet the operation requirements and reduce the labor cost.
In conclusion, the telescopic mechanism hydraulic control system and the hoisting equipment applied by the telescopic mechanism hydraulic control system realize the possibility of telescopic arm carrying telescopic work, and improve the working stability and application range of the equipment.
The invention is further described with reference to the following figures and detailed description.
Drawings
Fig. 1 is a hydraulic schematic diagram of a hydraulic control system of a telescopic mechanism in an embodiment.
Reference numbers in the figures: 1-a first telescopic oil cylinder, 2-a second telescopic oil cylinder, 3-a third telescopic oil cylinder, 4-a first balance valve, 5-a second balance valve, 6-a third balance valve, 7-a first hose reel, 8-a second hose reel, 9-a synchronous valve, 9.1-a one-way throttle valve, 9.2-a shuttle valve, 9.3-a first two-way cartridge valve, 9.4-a second two-way cartridge valve, 9.5-an overflow valve, 9.6-a first reversing valve, 9.7-a second reversing valve, 10-a shunt motor, 11-a telescopic sequence reversing valve, 11.1-a hydraulic control reversing valve, 11.2-a hydraulic control pilot valve, 11.3-an overflow valve, 11.4-a pilot pump and 12-a system reversing valve.
Detailed Description
Examples
Referring to fig. 1, a hydraulic control system of a telescopic mechanism in the figure is a specific embodiment of the present invention, and a three-stage telescopic cylinder is adopted to realize three-stage telescopic action of the telescopic mechanism, and includes a first telescopic cylinder 1, a second telescopic cylinder 2 and a third telescopic cylinder 3, wherein piston rods of the first telescopic cylinder 1 and the second telescopic cylinder 2 simultaneously perform telescopic action to form a synchronous telescopic cylinder group, and the third telescopic cylinder 3 performs telescopic action after the first telescopic cylinder 1 and the second telescopic cylinder 2 are telescopic in place, and is a sequential telescopic cylinder of the relative synchronous telescopic cylinder group.
In the invention, the same oil cavity in the synchronous telescopic oil cylinder and the oil cavities corresponding to the sequential telescopic oil cylinders are mutually communicated and are connected to one working oil port of the system reversing valve through a first oil path, the other oil cavities of all the synchronous telescopic oil cylinders and the oil cavities corresponding to the sequential telescopic oil cylinders are respectively connected to the other working oil port of the system reversing valve through a second oil path, correspondingly, in the embodiment, rod cavities of the first telescopic oil cylinder 1, the second telescopic oil cylinder 2 and the third telescopic oil cylinder 3 are mutually communicated and are connected to a working oil port A of the system reversing valve 12 through a first oil path, and rodless cavities of the first telescopic oil cylinder 1, the second telescopic oil cylinder 2 and the third telescopic oil cylinder 3 are respectively connected to a working oil port B of the system reversing valve 12 through respective second oil paths.
In order to realize synchronous telescopic action between the first telescopic cylinder 1 and the second telescopic cylinder 2 respectively, in this embodiment, the second oil path of the first telescopic cylinder 1 and the second oil path of the second telescopic cylinder 2 both pass through the synchronous valve 9, and the oil inlet end of the synchronous valve 9 is provided with the shunt motor 10 for uniformly distributing the flow of the hydraulic oil entering the first telescopic cylinder 1 and the second telescopic cylinder 2 through the synchronous valve 9; in order to realize the sequential telescopic action of the third telescopic cylinder 3, the oil inlet paths distributed to the first telescopic cylinder 1 and the second telescopic cylinder 2 by the shunt motor 10 and the second oil path of the third telescopic cylinder 3 are connected to the working oil port B of the system reversing valve 12 by the telescopic sequential reversing valve 11. The system reversing valve 12 is used for switching control of extension and retraction of piston rods of all three-stage telescopic oil cylinders, the telescopic sequence reversing valve 11 is used for sequential control of the third telescopic oil cylinder 3 relative to the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2, and the synchronous valve 9 is used for correcting and adjusting synchronous actions of the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2.
In addition, in order to ensure stable pressure maintaining for each telescopic cylinder, each of the first telescopic cylinder 1, the second telescopic cylinder 2 and the third telescopic cylinder 3 is provided with a first balance valve 4, a second balance valve 5 and a third balance valve 6, respectively.
The balance valve and the system reversing valve are common hydraulic valves in a crane hydraulic system, and the embodiment is not described in detail here.
The synchronizing valve 9 of the embodiment is an integrated valve block, a pressure passage P1-P1 ' and a pressure passage P2-P2 ' which are respectively in butt joint with a second oil passage of the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 are arranged inside the valve block, wherein a one-way throttle valve 9.1 is arranged on the pressure passage P1-P1 ', when the first telescopic oil cylinder and the second telescopic oil cylinder are contracted simultaneously, the first telescopic oil cylinder is subjected to larger gravity and acts faster than the second telescopic oil cylinder, the retracting speed of the first telescopic oil cylinder is reduced and the pressure is increased through the adjusting function of the one-way throttle valve, so that the purpose of synchronously retracting the first telescopic oil cylinder and the second telescopic oil cylinder is achieved, the pressure passages P1-P1 ' and the pressure passages P2-P2 ' are in by-connection communication through a shuttle valve 9.2, and a detection oil passage is used for detecting the pressure of the synchronizing valve through the shuttle valve 9.2. The pressure passages P1-P1 'and P2-P2' are respectively connected with oil return bypasses of a return oil tank through a first two-way cartridge valve 9.3 and a second two-way cartridge valve 9.4, the first two-way cartridge valve 9.3 and the second two-way cartridge valve 9.4 are respectively controlled by a first reversing valve 9.6 and a second reversing valve 9.7 which are respectively connected with the oil return bypasses, the first reversing valve 9.6 and the second reversing valve 9.7 are two-position electric control reversing valves with cut-off positions, the reversing valves control the opening and closing of the corresponding two-way cartridge valves and are connected with the in-position stroke switches of the telescopic oil cylinders communicated with the corresponding pressure passages in a feedback manner, and the first reversing valve 9.6, the second reversing valve 9.7 and the control oil passages are respectively connected with an overflow valve 9.5 in a bypass manner.
The telescopic sequence reversing valve 11 adopts a hydraulic control reversing valve and comprises a hydraulic control reversing valve 11.1 and a hydraulic control pilot valve 11.2, after the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 stretch in place, pilot oil acts through the hydraulic control pilot valve 11.2, and the pilot oil is provided through a pilot pump 11.4 which is independently arranged to push the hydraulic control reversing valve 11.1 to reverse. After the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 are synchronously telescopic, the third telescopic oil cylinder 3 is sequentially telescopic.
The hydraulic control system of the telescopic mechanism of the embodiment can be applied to hoisting equipment and is used for controlling the telescopic arm mechanism of the equipment to perform loaded telescopic motion, the embodiment comprises three-stage telescopic oil cylinders and a telescopic arm mechanism which can control four-section arms correspondingly, wherein a first telescopic oil cylinder 1 is arranged between a large arm and two telescopic arms, a second telescopic oil cylinder 2 is arranged between two telescopic arms and three telescopic arms, and a third telescopic oil cylinder 3 is arranged between three telescopic arms and four telescopic arms, so that when the whole telescopic arm telescopic mechanism performs telescopic operation, the second telescopic oil cylinder 2 and the third telescopic oil cylinder 3 can move along with the telescopic motion of the two telescopic arms and the three telescopic arms, for this purpose, oil pipes connecting the second telescopic oil cylinder 2 and the third telescopic oil cylinder can be automatically retracted through a first hose reel 7 and a second hose reel 8 respectively, the hydraulic oil pipe is adapted to the movement of the second telescopic oil cylinder 2 and the third telescopic oil cylinder 3.
The oil return port of the hydraulic control reversing valve 11.1 is connected with an oil tank in a return mode through an overflow valve 11.3, the pressure is kept through the overflow valve 11.3, and after the hose reel connected with the third telescopic oil cylinder 3 is placed for a long time, the oil inside the hose reel is leaked due to too long pipeline, so that the phenomena of insensitivity and delay in telescopic action are caused.
Referring to fig. 1 again, in the first telescopic cylinder 1, a rodless cavity of the first telescopic cylinder 1 is sequentially connected with the first balance valve 4, a cavity P1-P1' of the synchronizing valve 9, a cavity of the shunt motor 10, the telescopic sequence reversing valve 11 and the system reversing valve 12 through a second oil path to form an oil inlet path and an oil return path of the rodless cavity, and a rod cavity of the first telescopic cylinder 1 is connected with the system reversing valve 12 through the first oil path to form the oil inlet path and the oil return path of the rod cavity.
In the second telescopic cylinder 2, a rodless cavity of the second telescopic cylinder 2 is sequentially connected with a second balance valve 5, a first hose reel 7, a P2-P2' cavity of a synchronizing valve 9, two cavities of a shunt motor 10, a telescopic sequential reversing valve 11 and a system reversing valve 12 to form an oil inlet and oil return path of the rodless cavity, and a rod cavity of the telescopic cylinder is sequentially connected with a rod cavity of the first telescopic cylinder 1 and the system reversing valve 12 to form an oil inlet and oil return path of the rod cavity.
In the third telescopic oil cylinder 3, a rodless cavity of the third telescopic oil cylinder 3 is sequentially connected with a third balanced valve 6, a second hose reel 8, a telescopic sequence reversing valve 11, an oil inlet and oil return oil way which is formed by reversing through a hydraulic control pilot valve 11.2 and then connecting with a system reversing valve 12, and a rod cavity of the third telescopic oil cylinder 3 is sequentially connected with a rod cavity of the second telescopic oil cylinder 2, a rod cavity of the first telescopic oil cylinder 1 and the system reversing valve 12 to form the oil inlet and oil return oil way of the rod cavity.
In the telescopic working process of the telescopic arm mechanism of the hoisting equipment, the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 are synchronous in telescopic operation, two-section and three-section arms of the telescopic arm mechanism are synchronously driven to stretch, the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 are kept walking when stretching, the telescopic arm can be corrected when stretching to the end of the arm frame, the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 retract synchronously when stretching to the end of the arm frame, and the synchronous control process can be automatically corrected when the telescopic arm frame retracts to the end of the arm frame. The synchronization process is as follows: pressure oil of a port 11P of the telescopic sequence reversing valve flows through a shunt motor 10, flow is evenly distributed, errors exist during shunting of the shunt motor, load stress is large, load stress is small, the load stress is fast, a small part of the pressure oil can not be synchronized, for example, when the telescopic speed of a first telescopic oil cylinder 1 is slightly fast and a second telescopic oil cylinder 2 is short, in the extending process of the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2, a stroke switch corresponding to the telescopic oil cylinders is used for controlling the first reversing valve 9.6 or the second reversing valve 9.7 to be powered on, oil of the telescopic oil cylinder with the fast extending speed is enabled to be drained inside a synchronizing valve 9 through a corresponding two-way cartridge valve, and therefore the extending speed is reduced, and synchronous extending is achieved. When the first telescopic oil cylinder 1 with higher telescopic speed extends to the end, the pressure of an oil path connected with a rodless cavity rises to reach the pressure set by the overflow valve 9.5, overflow can be realized, the second telescopic oil cylinder 2 with lower telescopic speed continues to stretch to reach the same telescopic length, and the purpose of correcting synchronous extension of two-section and three-section arms of the telescopic arm mechanism is achieved. The principle of the retraction process of the first telescopic cylinder 1 and the second telescopic cylinder 2 is the same as the extension process, and the details are not repeated here in this embodiment.
When the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 are synchronously stretched in place, the telescopic sequence reversing valve 11 controls the third telescopic oil cylinder 3 to perform telescopic action in a reversing way, and the working principle of the telescopic sequence reversing valve 11 is as follows: when the electromagnetic valve of the hydraulic control pilot valve 11.2 is not powered, high-pressure oil P supplies oil to the shunt motor 10 to finally drive the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 to synchronously extend and retract, after the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2 extend and retract in place, a feedback signal controls the electromagnetic valve of the hydraulic control pilot valve 11.2 to be powered, the pilot pump 11.4 pumps pilot pressure oil to push the hydraulic control reversing valve 11.1 to reverse, and the high-pressure oil supplies oil to the third telescopic oil cylinder 3 to achieve the control that the third telescopic oil cylinder 3 sequentially extends and retracts relative to the first telescopic oil cylinder 1 and the second telescopic oil cylinder 2.
The hoisting equipment of the embodiment can be preferably used for a telescopic boom crawler crane and used for hoisting various down-the-hole drilling machines or spiral drilling machines for drilling construction, the telescopic boom of the crawler crane can realize loaded telescopic, and the telescopic boom of the crane is additionally provided with a support of a down-the-hole and a power head, so that the working range is enlarged, the operation requirement is met, and the labor cost is reduced.
The foregoing embodiments illustrate the principles and features of the present invention and their advantages, and it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the specific principles of operation of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. Telescopic machanism hydraulic control system, its characterized in that: comprises a synchronous telescopic oil cylinder group and a sequential telescopic oil cylinder;
the synchronous telescopic oil cylinder group comprises at least two groups of synchronous telescopic oil cylinders which synchronously perform telescopic action,
the same oil cavity in all the synchronous telescopic oil cylinders and the oil cavity corresponding to the sequential telescopic oil cylinder are communicated with each other and are connected to one of the working oil ports of the system reversing valve through a first oil way,
and the other oil cavities of all the synchronous telescopic oil cylinders and the oil cavities corresponding to the sequential telescopic oil cylinders are respectively connected to the other working oil ports of the system reversing valve through second oil paths, the second oil paths of the synchronous telescopic oil cylinders and the second oil paths of the sequential telescopic oil cylinders are connected to the system reversing valve through a telescopic sequential reversing valve in a tandem manner, and the second oil paths from all the synchronous telescopic oil cylinders to the telescopic sequential reversing valve are provided with synchronous valves.
2. The hydraulic control system of a telescopic mechanism according to claim 1, wherein the synchronous valve comprises a plurality of pressure passages which are respectively butted with the second oil passages of the synchronous telescopic cylinders, the pressure passages are communicated in a bypass mode through a shuttle valve, and each pressure passage is connected with a return oil bypass of a return oil tank through a two-way cartridge valve.
3. The hydraulic control system of a telescoping mechanism of claim 2, wherein the two-way cartridge valve is controlled by a reversing valve which is connected by a return oil bypass, the reversing valve is a two-position electric control reversing valve with a stop position, and the reversing valve is in feedback connection with an in-position travel switch of the synchronous telescoping oil cylinder.
4. The telescoping mechanism hydraulic control system of claim 4, the control oil path of the reversing valve being flanked by an overflow valve.
5. The telescopic mechanism hydraulic control system according to claim 2, wherein the pressure passage of the synchronizing valve is provided with a one-way throttle valve.
6. The hydraulic control system of a telescoping mechanism according to any of claims 1-5, wherein the second oil paths of all the synchronous telescoping cylinders are distributed by providing a split motor, and the split motor is provided at the oil inlet end of the synchronous valve.
7. The telescoping mechanism hydraulic control system of claim 1, the synchronous telescoping cylinder and sequential telescoping cylinder each having a balancing valve.
8. The telescoping mechanism hydraulic control system of claim 1, the telescoping sequence selector valve being a hydraulically controlled selector valve.
9. Hoisting equipment, its characterized in that: the telescopic arm mechanism comprising the hydraulic control system of telescopic mechanism as claimed in claims 1-8, wherein each movable telescopic arm is installed in one-to-one correspondence with a telescopic cylinder in the hydraulic control system of telescopic mechanism.
10. The hoisting device of claim 9, which is a telescopic arm crawler crane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843276.1A CN111852971A (en) | 2020-08-20 | 2020-08-20 | Telescopic mechanism hydraulic control system and hoisting equipment applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843276.1A CN111852971A (en) | 2020-08-20 | 2020-08-20 | Telescopic mechanism hydraulic control system and hoisting equipment applying same |
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| Publication Number | Publication Date |
|---|---|
| CN111852971A true CN111852971A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010843276.1A Pending CN111852971A (en) | 2020-08-20 | 2020-08-20 | Telescopic mechanism hydraulic control system and hoisting equipment applying same |
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| Country | Link |
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| CN (1) | CN111852971A (en) |
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2020
- 2020-08-20 CN CN202010843276.1A patent/CN111852971A/en active Pending
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