CN210655875U - Hydraulic control system of folding arm type lorry-mounted crane - Google Patents
Hydraulic control system of folding arm type lorry-mounted crane Download PDFInfo
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- CN210655875U CN210655875U CN201921624494.5U CN201921624494U CN210655875U CN 210655875 U CN210655875 U CN 210655875U CN 201921624494 U CN201921624494 U CN 201921624494U CN 210655875 U CN210655875 U CN 210655875U
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Abstract
The utility model belongs to lorry-mounted crane hydraulic control system, concretely relates to folding arm formula lorry-mounted crane hydraulic control system, the station of getting on of two three-way diverter valve is linked together with the landing leg control system of getting off, through the landing leg control valve, realize the single action and the linkage of landing leg of getting off, the station of getting off of two three-way diverter valve is linked together with the proportion multiple unit valve of getting on the bus, the proportion multiple unit valve of getting on the bus includes first work antithetical couplet, second work antithetical couplet, third work antithetical couplet and fourth work antithetical couplet, first work antithetical couplet and differential balance valve, first flexible hydro-cylinder, second flexible hydro-cylinder, third flexible hydro-cylinder and fourth flexible hydro-cylinder; the second working link, the second amplitude-variable balance valve and the second amplitude-variable oil cylinder form a second amplitude-variable control oil path; the third working link, the first amplitude-variable balance valve and the first amplitude-variable oil cylinder form a first amplitude-variable control oil path; and the fourth working link, the rotary balance valve and the rotary motor form a rotary control oil path. This application has improved the efficiency and the stability of work.
Description
Technical Field
The utility model belongs to lorry crane hydraulic control system, concretely relates to folding arm-type lorry crane hydraulic control system.
Background
The hydraulic control system of the folding arm type lorry-mounted crane generally comprises a lower-mounted leg control system and an upper-mounted crane control system, the whole system is generally controlled by a single pump, and the lower-mounted leg control system and the upper-mounted crane control system are required to be respectively controlled and interlocked for the safety of operation; for the adaptability of working conditions, the lower vehicle landing leg is required to be capable of single action or linkage; for the stability of operation, the control system of the boarding crane is required to be capable of jogging and reducing impact; in order to improve the work efficiency, the boarding crane control system is required to be able to increase the speed of the execution structure.
Disclosure of Invention
In order to overcome the shortcomings of the prior art, the utility model provides a folding arm type lorry-mounted crane hydraulic control system.
The utility model discloses a realize through following technical scheme: a hydraulic control system of a folding arm type lorry-mounted crane is characterized in that a plunger pump is connected with a support leg operating valve, the support leg operating valve comprises a two-position three-way switching valve and a support leg control valve, an upper station of the two-position three-way switching valve is communicated with a lower vehicle support leg control system, and a lower station of the two-position three-way switching valve is communicated with an upper vehicle crane control system; the landing leg control valve comprises a landing leg control valve switching link, a first landing leg control valve working link and a second landing leg control valve working link, the two-position three-way switching valve is connected with the landing leg control valve switching link, an oil port of the landing leg control valve switching link is simultaneously connected with a rod cavity of the left horizontal oil cylinder group, a rod cavity of the right horizontal oil cylinder group, a rod cavity of the left vertical landing leg oil cylinder and a rod cavity of the right vertical landing leg oil cylinder, another oil port of the landing leg control valve switching link is simultaneously connected with a first landing leg control valve working link and a second landing leg control valve working link, the first landing leg control valve working link is simultaneously communicated with a rodless cavity of the left horizontal oil cylinder group and a rodless cavity of the left vertical landing leg oil cylinder, and the second landing leg control valve working link is simultaneously communicated with a rodless cavity of the right horizontal oil cylinder group and a rodless cavity of the right vertical landing leg oil cylinder;
the lower station of the two-position three-way switching valve is communicated with an upper vehicle proportional multi-way valve, the upper vehicle proportional multi-way valve comprises a first working link, a second working link, a third working link and a fourth working link, the first working link, a differential balance valve, a first telescopic oil cylinder, a second telescopic oil cylinder, a third telescopic oil cylinder and a fourth telescopic oil cylinder form a boom control oil path, and zero-pressure-difference sequence valves are arranged among the telescopic oil cylinders; the second working link, the second amplitude-variable balance valve and the second amplitude-variable oil cylinder form a second amplitude-variable control oil path; the third working link, the first amplitude-variable balance valve and the first amplitude-variable oil cylinder form a first amplitude-variable control oil path; and the fourth working link, the rotary balance valve and the rotary motor form a rotary control oil path.
Furthermore, the two-position three-way switching valve and the supporting leg control valve are integrated valves.
Furthermore, two-way hydraulic locks are arranged between the oil circuit with the rod cavity of the left horizontal oil cylinder group and the oil circuit without the rod cavity of the left horizontal oil cylinder group, the oil circuit with the rod cavity of the right horizontal oil cylinder group and the oil circuit without the rod cavity of the right horizontal oil cylinder group, the oil circuit with the rod cavity of the left vertical support oil cylinder and the oil circuit without the rod cavity of the left vertical support oil cylinder, and the oil circuit with the rod cavity of the right vertical support oil cylinder and the oil circuit without the rod cavity of the right vertical support oil cylinder.
Furthermore, the left horizontal oil cylinder group comprises a left first horizontal oil cylinder, a left second horizontal oil cylinder and a sequence valve I, the left first horizontal oil cylinder is connected with the left second horizontal oil cylinder in parallel, and the sequence valve I is positioned between a rod cavity of the left first horizontal oil cylinder and a rod cavity of the left second horizontal oil cylinder; the right horizontal oil cylinder group comprises a right first horizontal oil cylinder, a right second horizontal oil cylinder and a sequence valve II, the right first horizontal oil cylinder is connected with the right second horizontal oil cylinder in parallel, and the sequence valve II is located between a rod cavity of the right first horizontal oil cylinder and a rod cavity of the right second horizontal oil cylinder.
The anti-explosion valve further comprises a torque limiting valve, a port C1 of the torque limiting valve is connected with a rod cavity of the first luffing oil cylinder, a port C2 of the torque limiting valve is connected with a rodless cavity of the second luffing oil cylinder, a port C3 of the torque limiting valve is connected with a rodless cavity of the first telescopic oil cylinder, a control oil port Pil of the torque limiting valve is connected to an anti-explosion valve at a port M of the first luffing balance valve, a control oil port I of the torque limiting valve is connected with the rod cavity of the first luffing oil cylinder, and a control oil port RS of the torque limiting valve is connected with the rod cavity of the first telescopic oil cylinder.
Furthermore, the differential balance valve is integrated by a pilot overflow valve I, a differential overflow valve and a direct-acting overflow valve I.
Furthermore, the second variable amplitude balance valve is integrated by a pilot overflow valve II and a direct-acting overflow valve II.
Further, the first amplitude balance valve is also integrated with a load compensation overflow valve.
The utility model has the advantages that: (1) when the system works, the getting-on and getting-off control systems can realize independent control and interlocking, thereby preventing the misoperation of getting on and off the train and improving the safety of the whole machine.
(2) When the landing leg control system gets off works, the control mode of the landing leg can be selected according to different working conditions, so that the landing leg is convenient to level, and the telescopic efficiency of the landing leg is improved.
(3) When the control system of the boarding crane works, the micro-motion can be realized, and the use stability of the crane is improved.
(4) When the control system of the crane for getting on the bus operates, linkage can be realized, and the working efficiency of the crane is improved.
(5) When the amplitude variation control oil way works, the impact can be effectively reduced, and the stability of the amplitude variation action is improved.
(6) When the boom control oil circuit works, the boom extension speed is greatly increased, the boom extension efficiency is improved, meanwhile, the booms can be extended sequentially, the energy consumption is reduced, and the working cost is saved.
Drawings
FIG. 1 is a schematic diagram of the oil pressure control of the present invention;
in the figure, 1, a plunger pump; 2. a loading proportional multi-way valve; 2-1, a first working unit; 2-2, a second working unit; 2-3, a third working connection; 2-4, a fourth working section; 3. a differential balance valve; 3-1, a pilot overflow valve I; 3-2, a differential overflow valve; 3-3, a direct-acting overflow valve I; 4. a first telescopic cylinder; 5. a zero differential pressure sequence valve; 6. a second telescopic cylinder; 7. a third telescopic oil cylinder; 8. a fourth telescopic oil cylinder; 9. a second variable amplitude balance valve; 9-1 and a pilot overflow valve II; 9-2, a direct-acting overflow valve II; 10. a second variable amplitude oil cylinder; 11. a first variable amplitude balance valve; 11-1, a load compensation overflow valve; 12. a first amplitude variation oil cylinder; 13. an explosion-proof valve; 14. a rotary balance valve; 15. a rotary motor; 16. a torque limiting valve; 17. a left horizontal cylinder group; 17-1, a sequence valve I; 17-2, a second horizontal oil cylinder on the left side; 17-3, a first horizontal oil cylinder on the left side; 18. a bidirectional hydraulic lock I; 19. a bidirectional hydraulic lock II; 20. a right horizontal cylinder group; 20-1, a sequence valve II; 20-2, a second horizontal oil cylinder on the right side; 20-3, a first horizontal oil cylinder on the right side; 21. a right vertical leg cylinder; 22. a bidirectional hydraulic lock IV; 23. a bidirectional hydraulic lock III; 24. a left vertical leg cylinder; 25. a leg operated valve; 25-1, a two-position three-way switching valve; 25-2, a support leg control valve; 25-2-1, a supporting leg control valve switching connection; 25-2-2, a first working connection of a supporting leg control valve; 25-2-3, a second working connection of the supporting leg control valve; 26. an oil return filter; 27. and an oil tank.
Detailed Description
The invention will be further explained below with reference to the drawings and examples.
As shown in fig. 1, in the hydraulic control system of the folding arm type lorry-mounted crane, a plunger pump 1 is connected with a supporting leg operating valve 25, the supporting leg operating valve 25 comprises a two-position three-way switching valve 25-1 and a supporting leg control valve 25-2, an upper station of the two-position three-way switching valve 25-1 is communicated with a lower vehicle supporting leg control system, and a lower station of the two-position three-way switching valve 25-1 is communicated with an upper vehicle crane control system; the landing leg control valve 25-2 comprises a landing leg control valve switching link 25-2-1, a first landing leg control valve working link 25-2-2 and a second landing leg control valve working link 25-2-3, the two-position three-way switching valve 25-1 is connected with the landing leg control valve switching link 25-2-1, an H oil port of the landing leg control valve switching link 25-2-1 is simultaneously connected with a rod cavity of the left horizontal oil cylinder group 17, a rod cavity of the right horizontal oil cylinder group 20, a rod cavity of the left vertical landing leg oil cylinder 24 and a rod cavity of the right vertical landing leg oil cylinder 21, the other oil port of the landing leg control valve switching link 25-2-1 is simultaneously connected with a first landing leg control valve working link 25-2-2 and a second landing leg control valve working link 25-2-3, and an a oil port 1 of the first landing leg control valve working link 25-2-2 is connected with a rodless cavity of the left horizontal oil cylinder group 17 The b1 of the first working link 25-2-2 of the supporting leg control valve is communicated with the rodless cavity of the left vertical supporting leg oil cylinder 24, the a2 oil port of the second working link 25-2-3 of the supporting leg control valve is communicated with the rodless cavity of the right horizontal oil cylinder group 20, and the b2 oil port of the second working link 25-2-3 of the supporting leg control valve is communicated with the rodless cavity of the right vertical supporting leg oil cylinder 21;
when the first work joint 25-2-2 of the landing leg control valve is positioned at a lower station and the landing leg control valve switching joint 25-2-1 is positioned at the lower station to work, the left horizontal oil cylinder group 17 retracts; when the first work joint 25-2-2 of the supporting leg control valve is positioned at a lower station and the switching joint 25-2-1 of the supporting leg control valve is positioned at an upper station to work, the left horizontal oil cylinder group 17 extends out; when the first working connection 25-2-2 of the support leg control valve is positioned at an upper station and the switching connection 25-2-1 of the support leg control valve is positioned at a lower station for working, the left vertical support leg oil cylinder 24 retracts; when the first working connection 25-2-2 of the support leg control valve is positioned at an upper station and the switching connection 25-2-1 of the support leg control valve is positioned at an upper station for working, the left vertical support leg oil cylinder 24 extends out, and the above operation is the working condition for controlling the independent action of the support leg.
In the get-off leg control system, a first working joint 25-2-2 of a leg control valve is positioned at a lower station, a second working joint 25-2-3 of the leg control valve is positioned at the lower station, and when a leg control valve switching joint 25-2-1 is positioned at the lower station to work, a left horizontal oil cylinder group 17 and a right horizontal oil cylinder group 20 synchronously retract; when the first work connection 25-2-2 of the supporting leg control valve is positioned at a lower station, the second work connection 25-2-3 of the supporting leg control valve is positioned at a lower station, and the switching connection 25-2-1 of the supporting leg control valve is positioned at an upper station to work, the left horizontal oil cylinder group 17 and the right horizontal oil cylinder group 20 synchronously extend out; when the first work link 25-2-2 of the support leg control valve is positioned at an upper station, the second work link 25-2-3 of the support leg control valve is positioned at an upper station, and the support leg control valve switching link 25-2-1 is positioned at a lower station to work, the left vertical support leg oil cylinder 24 and the right vertical support leg oil cylinder 21 synchronously retract; when the first work link 25-2-2 of the support leg control valve is positioned at an upper station, the second work link 25-2-3 of the support leg control valve is positioned at an upper station, and the support leg control valve switching link 25-2-1 is positioned at the upper station to work, the left vertical support leg oil cylinder 24 and the right vertical support leg oil cylinder 21 synchronously extend out, and the operation is a support leg linkage working condition.
The lower station of the two-position three-way switching valve 25-1 is communicated with the upper vehicle proportional multi-way valve 2, the upper vehicle proportional multi-way valve 2 comprises a first working link 2-1, a second working link 2-2, a third working link 2-3 and a fourth working link 2-4, the first working link 2-1, a differential balance valve 3, a first telescopic oil cylinder 4, a second telescopic oil cylinder 6, a third telescopic oil cylinder 7 and a fourth telescopic oil cylinder 8 form an arm extending control oil path, a zero-pressure-difference sequence valve 5 is arranged among the telescopic oil cylinders, the number of the telescopic oil cylinders is increased or decreased according to the number of the telescopic arms, and the differential balance valve 3 is integrated by a pilot overflow valve I3-1, a differential overflow valve 3-2 and a direct-acting overflow valve I3-3. The first working connection 2-1 is proportional control, and micro-motion control of the boom control oil way is realized. When the first working unit 2-1 works at an upper station, the boom cylinder extends out, return oil of a rod cavity of the boom cylinder enters a rodless cavity of the boom cylinder through the differential overflow valve 3-2 to form confluence, and the boom extension speed is effectively increased. When the pressure of the rod cavity is greater than the set pressure of the direct-acting overflow valve 3-3, the return oil of the rod cavity returns to the oil tank 27 through the direct-acting overflow valve 3-3 and the port A1 of the first working link 2-1 of the upper multi-way valve, at the moment, the differential function of the balance valve disappears, the boom extending speed is reduced, and the stability of the boom extending under the heavy load is ensured; when the first working unit 2-1 is in the lower station for working, the boom cylinder retracts.
The rodless cavity of the first telescopic oil cylinder 4 is connected with the V port of the zero-pressure-difference sequence valve 5, the rodless cavity of the second telescopic oil cylinder 6 is connected with the C port of the zero-pressure-difference sequence valve 5, similarly, the subsequent connection modes between the second telescopic oil cylinder 6 and the third telescopic oil cylinder 7 and between the third telescopic oil cylinder 7 and the fourth telescopic oil cylinder 8 are the same and are connected with the corresponding zero-pressure-difference sequence valve 5, when the pressure of the large cavity of the first telescopic oil cylinder 4 is greater than the set pressure of the zero-pressure-difference sequence valve 5, the zero-pressure-difference sequence valve 5 is opened, hydraulic oil enters the rodless cavity of the second telescopic oil cylinder 6 through the zero-pressure-difference sequence valve 5, and therefore the extension arm can be extended sequentially. The zero-pressure-difference sequence valve 5 has a large pressure regulating range and can realize sequential extension of multiple sections of arms. After the valve is opened, the pressure drop through the valve is rapidly reduced, and the energy consumption is greatly reduced.
A second working connection 2-2, a second amplitude-variable balance valve 9 and a second amplitude-variable oil cylinder 10 form a second amplitude-variable control oil path; the first working connection 2-2 is in proportional control, and micro-motion control of the second variable amplitude control oil way is realized. When the second working unit 2-2 works in the upper working position, hydraulic oil enters a rod cavity of the second amplitude-variable oil cylinder 10 through a port C1 by passing through the second amplitude-variable balance valve 9, and the second amplitude-variable oil cylinder 10 retracts at the moment; when the second working unit 2-2 works in the upper working position, hydraulic oil enters a rodless cavity of the second amplitude-variable oil cylinder 10 through a port C2 through the second amplitude-variable balance valve 9, and the second amplitude-variable oil cylinder 10 extends out; the two sides of the second variable amplitude balance valve 9, the oil outlet C1 and the oil outlet C2 are respectively integrated with a pilot overflow valve 9-1 and a direct-acting overflow valve 9-2, and when the rod cavity of the second variable amplitude oil cylinder 9 is impacted excessively instantly, the pilot overflow valve 9-1 releases pressure and reduces the impact of the rod cavity; when the rodless cavity of the second variable amplitude oil cylinder 9 has overlarge instantaneous impact, the pressure is released through the direct-acting overflow valve 9-2, and the impact of the rodless cavity is reduced, so that the stability of the second variable amplitude control oil way is improved.
The third working connection 2-3, the first amplitude-variable balance valve 11 and the first amplitude-variable oil cylinder 12 form a first amplitude-variable control oil path; and the third working connection 2-3 is in proportional control, so that the micro-motion control of the first variable amplitude control oil way is realized. When the third working link 2-3 of the multi-way valve on the upper vehicle works, hydraulic oil enters the rod cavity of the first amplitude-changing oil cylinder 12, and at the moment, the first amplitude-changing oil cylinder 12 retracts; when the third working unit 2-3 is in a lower working position for working, hydraulic oil enters the rodless cavity of the first amplitude-variable oil cylinder 12, and the first amplitude-variable oil cylinder 12 extends out at the moment; the oil outlet C1 of the first variable amplitude balance valve 11 is integrated with the load compensation overflow valve 11-1, and when the rodless cavity of the first variable amplitude oil cylinder 12 is impacted excessively instantly, the load compensation overflow valve 11-1 releases pressure to reduce the impact of the rodless cavity of the first variable amplitude oil cylinder 12, so that the stability of the first variable amplitude control oil path is improved. The load compensation overflow valve 11-1 can be replaced by a common direct-acting overflow valve.
And the fourth working connection 2-4, a rotary balance valve 14 and a rotary motor 15 form a rotary control oil path. The first working connection 2-4 is in proportional control, and micro-motion control of a rotary control oil way is realized, so that the rotary stability is improved. When the fourth working unit 2-4 works at the upper station, the rotary motor 15 rotates clockwise; when the fourth working link 2-4 is in the lower working position, the rotary motor 15 rotates anticlockwise.
The proportional multi-way valve in the application can be changed into a post-valve compensation type proportional multi-way valve.
The two-position three-way switching valve 25-1 may be an independent switching valve, and as a preferred embodiment, the two-position three-way switching valve 25-1 of the present application is an integrated valve combined with the leg control valve 25-2.
Further, a rod cavity oil way of the left horizontal oil cylinder group 17 and a rodless cavity oil way of the left horizontal oil cylinder group 17 are provided with a bidirectional hydraulic lock I18, a rod cavity oil way of the right horizontal oil cylinder group 20 and a rodless cavity oil way of the right horizontal oil cylinder group 20 are provided with a bidirectional hydraulic lock II 19, a rod cavity oil way of the left vertical support leg oil cylinder 24, a rodless cavity oil way of the left vertical support leg oil cylinder 24 and a rod cavity oil way of the right vertical support leg oil cylinder 21 are provided with a bidirectional hydraulic lock III 23, and a bidirectional hydraulic lock IV 24 is arranged between the rodless cavity oil ways of the right vertical support leg oil cylinder 21.
Specifically, the left horizontal cylinder group 17 comprises a left first horizontal cylinder 17-3, a left second horizontal cylinder 17-2 and a sequence valve I17-1, wherein the left first horizontal cylinder 17-3 is connected with the left second horizontal cylinder 17-2 in parallel, the sequence valve I17-1 is positioned between a rod cavity of the left first horizontal cylinder 17-3 and a rod cavity of the left second horizontal cylinder 17-2, and the sequence valve 17-1 is used for realizing sequential extension and retraction of the left first horizontal cylinder 17-3 and the left second horizontal cylinder 17-2; the right horizontal oil cylinder group 20 comprises a right first horizontal oil cylinder 20-3, a right second horizontal oil cylinder 20-2 and a sequence valve II 20-1, the right first horizontal oil cylinder 20-3 is connected with the right second horizontal oil cylinder 20-2 in parallel, the sequence valve II 20-1 is positioned between a rod cavity of the right first horizontal oil cylinder 20-3 and a rod cavity of the right second horizontal oil cylinder 20-2, and the sequence valve 20-1 is used for realizing the sequential telescopic function of the right first horizontal oil cylinder 20-3 and the right second horizontal oil cylinder 20-2.
As an improvement of the embodiment, the variable-amplitude balance valve further comprises a torque limiting valve 16, wherein a port C1 of the torque limiting valve 16 is connected with a rod cavity of the first variable-amplitude oil cylinder 12, a port C2 is connected with a rodless cavity of the second variable-amplitude oil cylinder 10, a port C3 is connected with a rodless cavity of the first telescopic oil cylinder 4, a control oil port Pil is connected with an explosion-proof valve 13 arranged at a port M of the first variable-amplitude balance valve 11, a control oil port I is connected with the rod cavity of the first variable-amplitude oil cylinder 12, and a control oil port RS is connected with the rod cavity of the first telescopic oil cylinder 4. No matter the first luffing cylinder 10 falls, the second luffing cylinder 12 extends or the boom cylinder extends, when the torque of the system exceeds the set value of the torque limiting valve 16, the loading crane control system unloads, the hydraulic oil returns to the oil tank 27 through the T port of the torque limiting valve 16, and the oil port of the oil tank 27 is provided with the oil return filter 26. At the moment, the first luffing cylinder 12 cannot fall, and the second luffing cylinder 10 and the boom cylinder cannot extend, so that the system moment is not increased any more, and the safety of the crane is effectively protected.
Claims (8)
1. The utility model provides a folding arm-type lorry crane hydraulic control system which characterized in that: the plunger pump (1) is connected with a supporting leg operating valve (25), the supporting leg operating valve (25) comprises a two-position three-way switching valve (25-1) and a supporting leg control valve (25-2), an upper station of the two-position three-way switching valve (25-1) is communicated with a lower vehicle supporting leg control system, and a lower station of the two-position three-way switching valve (25-1) is communicated with an upper vehicle crane control system; the landing leg control valve (25-2) comprises a landing leg control valve switching link (25-2-1), a first landing leg control valve working link (25-2-2) and a second landing leg control valve working link (25-2-3), the two-position three-way switching valve (25-1) is connected with the landing leg control valve switching link (25-2-1), an oil port of the landing leg control valve switching link (25-2-1) is simultaneously connected with a rod cavity of the left horizontal oil cylinder group (17), a rod cavity of the right horizontal oil cylinder group (20), a rod cavity of the left vertical landing leg oil cylinder (24) and a rod cavity of the right vertical landing leg oil cylinder (21), and the other oil port of the landing leg control valve switching link (25-2-1) is simultaneously connected with the first landing leg control valve working link (25-2-2) and the second landing leg control valve working link (25-2-3), a first working connection (25-2-2) of the supporting leg control valve is simultaneously communicated with a rodless cavity of the left horizontal oil cylinder group (17) and a rodless cavity of the left vertical supporting leg oil cylinder (24), and a second working connection (25-2-3) of the supporting leg control valve is simultaneously communicated with a rodless cavity of the right horizontal oil cylinder group (20) and a rodless cavity of the right vertical supporting leg oil cylinder (21);
a lower station of the two-position three-way switching valve (25-1) is communicated with a loading proportional multi-way valve (2), the loading proportional multi-way valve (2) comprises a first working link (2-1), a second working link (2-2), a third working link (2-3) and a fourth working link (2-4), the first working link (2-1), the differential balance valve (3), a first telescopic oil cylinder (4), a second telescopic oil cylinder (6), a third telescopic oil cylinder (7) and a fourth telescopic oil cylinder (8) form a boom control oil path, and a zero-pressure-difference sequence valve (5) is arranged among all the telescopic oil cylinders; a second working connection (2-2), a second amplitude-variable balance valve (9) and a second amplitude-variable oil cylinder (10) form a second amplitude-variable control oil path; a first amplitude-variable control oil way is formed by the third working connection (2-3), the first amplitude-variable balance valve (11) and the first amplitude-variable oil cylinder (12); the fourth working connection (2-4), the rotary balance valve (14) and the rotary motor (15) form a rotary control oil path.
2. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the two-position three-way switching valve (25-1) and the supporting leg control valve (25-2) are integrated valves.
3. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: and bidirectional hydraulic locks are arranged between a rod cavity oil way of the left horizontal oil cylinder group (17) and a rodless cavity oil way of the left horizontal oil cylinder group (17), a rod cavity oil way of the right horizontal oil cylinder group (20) and a rodless cavity oil way of the right horizontal oil cylinder group (20), a rod cavity oil way of the left vertical supporting leg oil cylinder (24) and a rodless cavity oil way of the left vertical supporting leg oil cylinder (24), and a rod cavity oil way of the right vertical supporting leg oil cylinder (21) and a rodless cavity oil way of the right vertical supporting leg oil cylinder (21).
4. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the left horizontal oil cylinder group (17) comprises a left first horizontal oil cylinder (17-3), a left second horizontal oil cylinder (17-2) and a sequence valve I (17-1), the left first horizontal oil cylinder (17-3) is connected with the left second horizontal oil cylinder (17-2) in parallel, and the sequence valve I (17-1) is positioned between a rod cavity of the left first horizontal oil cylinder (17-3) and a rod cavity of the left second horizontal oil cylinder (17-2); the right horizontal oil cylinder group (20) comprises a right first horizontal oil cylinder (20-3), a right second horizontal oil cylinder (20-2) and a sequence valve II (20-1), the right first horizontal oil cylinder (20-3) is connected with the right second horizontal oil cylinder (20-2) in parallel, and the sequence valve II (20-1) is located between a rod cavity of the right first horizontal oil cylinder (20-3) and a rod cavity of the right second horizontal oil cylinder (20-2).
5. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the anti-explosion valve further comprises a moment limiting valve (16), a C1 port of the moment limiting valve (16) is connected with a rod cavity of the first luffing cylinder (12), a C2 port of the moment limiting valve (16) is connected with a rodless cavity of the second luffing cylinder (10), a C3 port of the moment limiting valve (16) is connected with the rodless cavity of the first telescopic cylinder (4), a control oil port Pil of the moment limiting valve (16) is connected and installed on an anti-explosion valve (13) at an M port of the first luffing balance valve (11), a control oil port I of the moment limiting valve (16) is connected with the rod cavity of the first luffing cylinder (12), and a control oil port RS of the moment limiting valve (16) is connected with the rod cavity of the first telescopic cylinder (4).
6. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the differential balance valve (3) is integrated by a pilot overflow valve I (3-1), a differential overflow valve (3-2) and a direct-acting overflow valve I (3-3).
7. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the second variable amplitude balance valve (9) is integrated by a pilot overflow valve II (9-1) and a direct-acting overflow valve II (9-2).
8. The folding arm lorry-mounted crane hydraulic control system of claim 1, characterized in that: the first amplitude balance valve (11) is also integrated with a load compensation overflow valve (11-1).
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| CN201921624494.5U CN210655875U (en) | 2019-09-27 | 2019-09-27 | Hydraulic control system of folding arm type lorry-mounted crane |
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| CN201921624494.5U CN210655875U (en) | 2019-09-27 | 2019-09-27 | Hydraulic control system of folding arm type lorry-mounted crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113562672A (en) * | 2021-07-28 | 2021-10-29 | 徐州海伦哲特种车辆有限公司 | Telescopic boom control device suitable for line pole comprehensive operation vehicle and operation vehicle |
| CN113803309A (en) * | 2021-09-13 | 2021-12-17 | 徐州徐工随车起重机有限公司 | Energy-saving type high-altitude operation vehicle getting-on and getting-off interlocking system and control method thereof |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113562672A (en) * | 2021-07-28 | 2021-10-29 | 徐州海伦哲特种车辆有限公司 | Telescopic boom control device suitable for line pole comprehensive operation vehicle and operation vehicle |
| CN113562672B (en) * | 2021-07-28 | 2022-10-04 | 徐州海伦哲特种车辆有限公司 | Telescopic boom control device suitable for line pole comprehensive operation vehicle and operation vehicle |
| CN113803309A (en) * | 2021-09-13 | 2021-12-17 | 徐州徐工随车起重机有限公司 | Energy-saving type high-altitude operation vehicle getting-on and getting-off interlocking system and control method thereof |
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