Hydraulic system, telescopic arm and operation machine
By designing multiple oil circuits and switching valves in the hydraulic system, coordinated control of the main boom and auxiliary boom is achieved, solving the problem of low extension efficiency of the operating machinery and realizing fast, flexible extension movements and energy-saving effects.
Patent Information
- Application Number
- CN202423322296.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing technologies, the telescopic efficiency of operating machinery is relatively low, especially during the telescopic process of the main boom.
A hydraulic system is adopted to achieve synchronous extension and retraction of the main boom and auxiliary boom through coordinated control of the main boom and auxiliary boom and by using a combination of multiple oil circuits and switching valves. The system includes a hydraulic circuit design with rodless and rod chambers, and is equipped with proportional valves and check valves to realize the merging and splitting of hydraulic oil, thereby improving the extension and retraction efficiency.
It enables rapid extension and retraction of the main boom and auxiliary boom, improves the extension and retraction efficiency of the operating machinery, enhances the working range and operational flexibility, and saves energy consumption.
Smart Images
Figure CN223578344U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of engineering machinery, and in particular to a hydraulic system, a telescopic arm and a working machine. BACKGROUND
[0002] A working machine such as a crane completes the lifting of a heavy object through the cooperation of a main arm and a sub-arm. In the telescoping process, the main arm has a long stroke. In the related art, the telescoping action of the main arm is completed by a main arm telescoping cylinder only, and the telescoping efficiency is low. CONTENT OF THE UTILITY MODEL
[0003] Therefore, the embodiments of the present application aim to provide a hydraulic system, a telescopic arm and a working machine, which have high telescoping efficiency.
[0004] To achieve the above object, the technical scheme of the embodiments of the present application is as follows:
[0005] The embodiments of the present application disclose a hydraulic system, comprising:
[0006] a main arm telescoping cylinder having a main rodless chamber and a main rod chamber;
[0007] a first working oil path and a second working oil path, the first working oil path being connected to the main rodless chamber, and the second working oil path being connected to the main rod chamber;
[0008] a sub-arm telescoping cylinder having a sub-rodless chamber and a sub-rod chamber;
[0009] a first oil path, a second oil path and a third oil path, the first oil path being selectively connected to the sub-rod chamber or the sub-rod chamber, the second oil path being connected to the main rod chamber, and the third oil path being connected to the main rodless chamber;
[0010] a third working oil path and a fourth working oil path, the third working oil path being connected to the third oil path, and the fourth working oil path being selectively connected to the first oil path or the second oil path.
[0011] In an embodiment, the hydraulic system comprises a first switching valve having a first working position and a second working position. In a state where the first switching valve is switched to the first working position, the third working oil path is cut off from the third oil path, and the fourth working oil path is connected to the first oil path. In a state where the first switching valve is switched to the second working position, the third working oil path is connected to the third oil path, and the fourth working oil path is connected to the second oil path.
[0012] In an embodiment, the hydraulic system comprises a fourth oil line and a sub-arm rotary oil cylinder, the sub-arm rotary oil cylinder has a forward rotation port and a reverse rotation port, one end of the fourth oil line selectively communicates with the forward rotation port or the reverse rotation port, the other end of the fourth oil line communicates with the third working oil line in the state that the first switching valve is in the first working position.
[0013] In an embodiment, the hydraulic system comprises a fifth oil line, a sixth oil line, a seventh oil line, an eighth oil line and a second switching valve, the fifth oil line communicates with the sub-rodless chamber, the sixth oil line communicates with the sub-rod chamber, the seventh oil line communicates with the forward rotation port, the eighth oil line communicates with the reverse rotation port, the second switching valve has a third working position and a fourth working position, in the state that the second switching valve is in the third working position, the fourth oil line communicates with the eighth oil line, the first oil line communicates with the sixth oil line, in the state that the second switching valve is in the fourth working position, the fourth oil line communicates with the seventh oil line, the third oil line communicates with the fifth oil line.
[0014] In an embodiment, the hydraulic system comprises a forward rotation check valve, a forward rotation overflow valve, a reverse rotation check valve and a reverse rotation overflow valve, the forward rotation check valve is arranged on the seventh oil line, the outlet of the forward rotation check valve communicates with the forward rotation port, the inlet of the forward rotation overflow valve communicates with the forward rotation port, the control port of the forward rotation overflow valve communicates with the eighth oil line, the reverse rotation check valve is arranged on the seventh oil line, the outlet of the reverse rotation check valve communicates with the reverse rotation port, the inlet of the reverse rotation overflow valve communicates with the reverse rotation port, the control port of the reverse rotation overflow valve communicates with the seventh oil line.
[0015] In an embodiment, the hydraulic system comprises a balance valve, the balance valve has a first working port, a second working port and a pilot port, the first working port communicates with the fifth oil line, the second working port communicates with the sub-rodless chamber, the pilot port communicates with the sixth oil line.
[0016] In an embodiment, the hydraulic system comprises a third overflow valve and a third check valve, the third overflow valve and the third check valve are connected in parallel on the sixth oil line, the inlet of the third overflow valve communicates with the sub-rod chamber, the control port of the third overflow valve communicates with the fifth oil line, the outlet of the third check valve communicates with the sub-rod chamber.
[0017] In an embodiment, the hydraulic system comprises a main proportional valve and a sub-proportional valve, the main proportional valve has a first oil port and a second oil port, the first oil port communicates with the first working oil line, the second oil port communicates with the second working oil line, the sub-proportional valve has a third oil port and a fourth oil port, the third oil port communicates with the third working oil line, the fourth oil port communicates with the fourth working oil line.
[0018] In another aspect, the embodiments of the present application disclose a telescopic arm comprising the hydraulic system in any of the above embodiments.
[0019] In another aspect, the embodiments of the present application disclose a working machine comprising the telescopic arm in any of the above embodiments.
[0020] The embodiments of the present application disclose a hydraulic system, a telescopic arm and a working machine. A first working oil passage is connected with a main rodless chamber, and a second working oil passage is connected with a main rod chamber. In this way, hydraulic oil in the first working oil passage can flow into the main rodless chamber, and hydraulic oil in the main rod chamber can flow out through the second working oil passage, so as to realize the extension of the main arm telescopic cylinder. Of course, hydraulic oil can also flow into the main rod chamber through the second working oil passage, and hydraulic oil in the main rodless chamber can flow out through the first working oil passage, so as to realize the retraction of the main arm telescopic cylinder. The first oil passage is selectively connected with a secondary rod chamber or a secondary rodless chamber, the fourth working oil passage is selectively connected with the first oil passage or the second oil passage, and the third working oil passage is connected with the third oil passage, that is, the third working oil passage can be selectively connected with or disconnected from the third oil passage. In this way, when the main arm needs to be extended quickly, the third working oil passage can be connected with the third oil passage, so that the hydraulic oil in the third working oil passage and the third oil passage can flow into the main rodless chamber together with the hydraulic oil in the first working oil passage, so as to accelerate the extension of the main arm telescopic cylinder. When the main arm needs to be retracted quickly, the fourth working oil passage can be connected with the second oil passage, so that the hydraulic oil in the fourth working oil passage and the second oil passage can flow into the main rod chamber together with the hydraulic oil in the second working oil passage, so as to accelerate the retraction of the main arm telescopic cylinder. When the secondary arm needs to be extended, the fourth working oil passage can be connected with the first oil passage, and the first oil passage can be connected with the secondary rodless chamber, so as to realize the extension of the secondary arm telescopic cylinder. When the secondary arm needs to be retracted, the fourth working oil passage can be connected with the first oil passage, and the first oil passage can be connected with the secondary rod chamber, so as to realize the retraction of the secondary arm telescopic cylinder. In this way, when the main arm telescopic cylinder is extended or retracted, the flow of the secondary arm telescopic cylinder can be combined into the flow of the main arm telescopic cylinder, so as to realize quick action and high telescopic efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A hydraulic principle diagram of the hydraulic system provided by the embodiments of the present application is shown in the figure.
[0022] MARKS
[0023] 1000, hydraulic system; 100, main arm telescopic cylinder; 1, main rodless chamber; 2, main rod chamber; 200, auxiliary arm telescopic cylinder; 201, auxiliary rodless chamber; 202, auxiliary rod chamber; 300, first working oil way; 400, second working oil way; 401, second main working oil way; 402, second primary working oil way; 403, second secondary working oil way; 500, third working oil way; 600, fourth working oil way; 700, first oil way; 800, second oil way; 900, third oil way; A, first switching valve; A1, first working position; A2, second working position; B, fourth oil way; C, auxiliary arm rotary cylinder; C1, forward rotation port; C2, reverse rotation port; D, fifth oil way; E, sixth oil way; F, seventh oil way; G, eighth oil way; H, second switching valve; H1, third working position; H2, fourth working position; J, forward rotation check valve; K, forward rotation overflow valve; L, reverse rotation check valve; M, reverse rotation overflow valve; N, main proportional valve; N1, first oil port; N2, second oil port; P, auxiliary proportional valve; P1, third oil port; P2, fourth oil port; Q, balance valve; Q1, first working port; Q2, second working port; Q3, pilot port; R, third overflow valve; T, third check valve. DETAILED DESCRIPTION
[0024] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as the explanation and illustration of the purpose of the present application, and should not be regarded as improper limitation on the present application.
[0025] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The "first", "second" and the like in the embodiments of the present application are only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "a plurality of" is at least two, such as two, three and the like, unless otherwise specifically limited.
[0026] In order to better understand the hydraulic system provided by the present application, the telescopic arm is first described.
[0027] The present application provides a telescopic arm in one aspect, which comprises the hydraulic system in any one of the above embodiments.
[0028] For example, the telescopic arm further comprises a main arm and an auxiliary arm, the auxiliary arm is movably connected with the main arm, and the hydraulic system is used to drive the main arm and / or the auxiliary arm to telescope and rotate.
[0029] The present application provides a hydraulic system 1000 of a working machine in another aspect, please refer to Figure 1The hydraulic system 1000 comprises a main arm telescopic cylinder 100, a sub-arm telescopic cylinder 200, a first working oil path 300, a second working oil path 400, a third working oil path 500, a fourth working oil path 600, a first oil path 700, a second oil path 800 and a third oil path 900. The main arm telescopic cylinder 100 has a main rodless cavity 1 and a main rod cavity 2. The first working oil path 300 is connected to the main rodless cavity 1, and the second working oil path 400 is connected to the main rod cavity 2. The sub-arm telescopic cylinder 200 has a sub-rodless cavity 201 and a sub-rod cavity 202. The first oil path 700 is selectively connected to the sub-rod cavity 202 or the sub-rodless cavity 201, the second oil path 800 is connected to the main rod cavity 2, and the third oil path 900 is connected to the main rodless cavity 1. The third working oil path 500 is connected to the third oil path 900, and the fourth working oil path 600 is selectively connected to the first oil path 700 or the second oil path 800.
[0030] The hydraulic system 1000 of the work machine provided in the embodiments of the present application is provided with a first working oil path 300 connected with the main rodless chamber 1 and a second working oil path 400 connected with the main rod chamber 2. In this way, hydraulic oil in the first working oil path 300 can flow into the main rodless chamber 1, and hydraulic oil in the main rod chamber 2 can flow back to the second working oil path 400, so as to realize the extension of the main arm telescopic cylinder 100. Of course, hydraulic oil can also flow into the main rod chamber 2 through the second working oil path 400, and hydraulic oil in the main rodless chamber 1 can flow back to the first working oil path 300, so as to realize the retraction of the main arm telescopic cylinder 100. The first oil path 700 is selectively connected with the auxiliary rod chamber 202 or the auxiliary rodless chamber 201, the fourth working oil path 600 is selectively connected with the first oil path 700 or the second oil path 800, and the third working oil path 500 is connected with the third oil path 900, that is, the third working oil path 500 can be selectively connected with or disconnected from the third oil path 900. In this way, when the main arm needs to be extended quickly, the third working oil path 500 can be connected with the third oil path 900, so that the hydraulic oil in the third working oil path 500 and the third oil path 900 can flow into the main rodless chamber 1 together with the hydraulic oil in the first working oil path 300, so as to accelerate the extension of the main arm telescopic cylinder 100. When the main arm needs to be retracted quickly, the fourth working oil path 600 can be connected with the second oil path 800, so that the hydraulic oil in the fourth working oil path 600 and the second oil path 800 can flow into the main rod chamber 2 together with the hydraulic oil in the second working oil path 400, so as to accelerate the retraction of the main arm telescopic cylinder 100. When the auxiliary arm needs to be extended, the fourth working oil path 600 can be connected with the first oil path 700, and the first oil path 700 can be connected with the auxiliary rodless chamber 201, so as to realize the extension of the auxiliary arm telescopic cylinder 200. When the auxiliary arm needs to be retracted, the fourth working oil path 600 can be connected with the first oil path 700, and the first oil path 700 can be connected with the auxiliary rod chamber 202, so as to realize the retraction of the auxiliary arm telescopic cylinder 200. In this way, when the main arm telescopic cylinder 100 is extended or retracted, the flow of the auxiliary arm telescopic cylinder 200 can be combined with the flow of the main arm telescopic cylinder 100, so as to realize quick action and high efficiency.
[0031] Based on the advantages of the hydraulic system 1000, the telescopic arm provided in the present application can realize quick action.
[0032] In an embodiment, please refer to Figure 1The hydraulic system 1000 comprises a first switching valve A having a first working position A1 and a second working position A2. When the first switching valve A is switched to the first working position A1, the third working oil passage 500 is cut off from the third oil passage 900, and the fourth working oil passage 600 is connected to the first oil passage 700. When the first switching valve A is switched to the second working position A2, the third working oil passage 500 is connected to the third oil passage 900, and the fourth working oil passage 600 is connected to the second oil passage 800.
[0033] For example, when the main arm needs to be extended quickly, the first working oil passage 300 and the third working oil passage 500 can be configured as oil supply passages, and the second working oil passage 400 and the fourth working oil passage 600 can be configured as oil return passages. In this case, the first switching valve A can be switched to the second working position A2, so that the third working oil passage 500 is connected to the third oil passage 900, and the fourth working oil passage 600 is connected to the second oil passage 800. In this way, part of the hydraulic oil in the third working oil passage 500 and the third oil passage 900 can flow into the main rodless chamber 1 together with the hydraulic oil in the first working oil passage 300, so as to accelerate the extension of the main arm telescopic cylinder 100. Meanwhile, the hydraulic oil in the main rod chamber 2 can return through the second working oil passage 400, the second oil passage 800 and the fourth working oil passage 600. When the main arm needs to be retracted quickly, the first working oil passage 300 and the third working oil passage 500 can be configured as oil return passages, and the second working oil passage 400 and the fourth working oil passage 600 can be configured as oil supply passages. In this case, the first switching valve A can be switched to the second working position A2, so that the fourth working oil passage 600 is connected to the second oil passage 800, and the third working oil passage 500 is connected to the third oil passage 900. In this way, part of the hydraulic oil in the fourth working oil passage 600 and the second oil passage 800 can flow into the main rod chamber 2 together with the hydraulic oil in the second working oil passage 400, so as to accelerate the retraction of the main arm telescopic cylinder 100. Meanwhile, the hydraulic oil in the main rodless chamber 1 can return through the first working oil passage 300, the third working oil passage 500 and the third oil passage 900.
[0034] When the main arm telescopic cylinder 100 is in place, the first switching valve A can be switched to the first working position A1, so that the third working oil passage 500 is cut off from the third oil passage 900, and the fourth working oil passage 600 is connected to the first oil passage 700. In this way, the main arm telescopic cylinder 100 can be supplied with oil and return oil through the first working oil passage 300 and the second working oil passage 400, so as to realize the telescopic action. Meanwhile, the auxiliary arm telescopic cylinder 200 can be selectively connected to the auxiliary rod chamber 202 and the auxiliary rodless chamber 201 through the first oil passage 700, so as to realize the telescopic action.
[0035] In an embodiment, please refer to Figure 1, the hydraulic system 1000 comprises a fourth oil path B and a sub-arm rotary cylinder C, the sub-arm rotary cylinder C has a forward rotation port C1 and a reverse rotation port C2, one end of the fourth oil path B selectively communicates with the forward rotation port C1 or the reverse rotation port C2, and the first switching valve A is in the state of the first working position A1, and the other end of the fourth oil path B communicates with the third working oil path 500.
[0036] For example, when the first switching valve A is switched to the first working position A1, the third working oil path 500 communicates with the fourth oil path B, and the fourth working oil path 600 communicates with the first oil path 700. When the third working oil path 500 is configured as a supply oil path and the fourth working oil path 600 is configured as a return oil path, the hydraulic oil in the third working oil path 500 can enter the fourth oil path B, and the fourth oil path B selectively communicates with the forward rotation port C1 or the reverse rotation port C2, so that the rotation of the sub-arm rotary cylinder C can be realized, thereby improving the working range of the working machine, and the hydraulic oil in the sub-rodless chamber 201 or the sub-rod chamber 202 of the sub-arm telescopic cylinder 200 can return to the fourth working oil path through the first oil path 700.
[0037] In an embodiment, referring to Figure 1 , the hydraulic system 1000 comprises a fifth oil path D, a sixth oil path E, a seventh oil path F, an eighth oil path G and a second switching valve H, the fifth oil path D communicates with the sub-rodless chamber 201, the sixth oil path E communicates with the sub-rod chamber 202, the seventh oil path F communicates with the forward rotation port C1, the eighth oil path G communicates with the reverse rotation port C2, and the second switching valve H has a third working position H1 and a fourth working position H2. In the state that the second switching valve H is in the third working position H1, the fourth oil path B communicates with the eighth oil path G, and the first oil path 700 communicates with the sixth oil path E. In the state that the second switching valve H is in the fourth working position H2, the fourth oil path B communicates with the seventh oil path F, and the first oil path 700 communicates with the fifth oil path D.
[0038] For example, when the first switching valve A is switched to the first working position A1 and the second switching valve H is switched to the third working position H1, the third working oil path 500 communicates with the fourth oil path B, the fourth working oil path 600 communicates with the first oil path 700, the fourth oil path B communicates with the eighth oil path G, and the first oil path 700 communicates with the sixth oil path E. When the third working oil path 500 is configured as a supply oil path and the fourth working oil path 600 is configured as a return oil path, the hydraulic oil in the third working oil path 500 can enter the fourth oil path B, the fourth oil path B communicates with the eighth oil path G and enters the reverse rotation port C2, so that the sub-arm rotary cylinder C is reversed, and the hydraulic oil in the sub-rod chamber 202 can enter the first oil path 700 through the sixth oil path E and finally return to the fourth working oil path 600.
[0039] When the first switching valve A is switched to the first working position A1 and the second switching valve H is switched to the fourth working position H2, the third working oil passage 500 is communicated with the fourth oil passage B, the fourth working oil passage 600 is communicated with the first oil passage 700, the fourth oil passage B is communicated with the seventh oil passage F, the first oil passage 700 is communicated with the fifth oil passage D, when the third working oil passage 500 is configured as an oil supply oil passage and the fourth working oil passage 600 is configured as an oil return oil passage, the hydraulic oil in the third working oil passage 500 can enter the fourth oil passage B, the fourth oil passage B is communicated with the seventh oil passage F and enters the forward rotation port C1, so that the auxiliary arm swing cylinder C rotates forward, and the hydraulic oil in the auxiliary rodless chamber 201 can enter the first oil passage 700 through the fifth oil passage D and finally return to the fourth working oil passage 600.
[0040] When the first switching valve A is switched to the first working position A1 and the second switching valve H is switched to the third working position H1, the third working oil passage 500 is communicated with the fourth oil passage B, the fourth working oil passage 600 is communicated with the first oil passage 700, the fourth oil passage B is communicated with the eighth oil passage G, the first oil passage 700 is communicated with the sixth oil passage E, when the third working oil passage 500 is configured as an oil return oil passage and the fourth working oil passage 600 is configured as an oil supply oil passage, the hydraulic oil in the fourth working oil passage 600 can enter the first oil passage 700 and then enter the auxiliary rod chamber 202 through the sixth oil passage E, so that the auxiliary arm telescopic cylinder 200 retracts, and the hydraulic oil in the reverse rotation port C2 can enter the fourth oil passage B through the eighth oil passage G and finally return to the third working oil passage 500.
[0041] When the first switching valve A is switched to the first working position A1 and the second switching valve H is switched to the fourth working position H2, the third working oil passage 500 is communicated with the fourth oil passage B, the fourth working oil passage 600 is communicated with the first oil passage 700, the fourth oil passage B is communicated with the seventh oil passage F, the first oil passage 700 is communicated with the fifth oil passage D, when the third working oil passage 500 is configured as an oil return oil passage and the fourth working oil passage 600 is configured as an oil supply oil passage, the hydraulic oil in the fourth working oil passage 600 can enter the first oil passage 700 and then enter the auxiliary rodless chamber 201 through the fifth oil passage D, so that the auxiliary arm telescopic cylinder 200 extends, and the hydraulic oil in the forward rotation port C1 can enter the fourth oil passage B through the seventh oil passage F and finally return to the third working oil passage 500.
[0042] In an embodiment, referring to Figure 1 , the hydraulic system 1000 comprises a forward rotation one-way valve J, a forward rotation overflow valve K, a reverse rotation one-way valve L and a reverse rotation overflow valve M, the forward rotation one-way valve J is arranged on the seventh oil passage F, the outlet of the forward rotation one-way valve J is communicated with the forward rotation port C1, the inlet of the forward rotation overflow valve K is communicated with the forward rotation port C1, the control port of the forward rotation overflow valve K is communicated with the eighth oil passage G, the reverse rotation one-way valve L is arranged on the seventh oil passage F, the outlet of the reverse rotation one-way valve L is communicated with the reverse rotation port C2, the inlet of the reverse rotation overflow valve M is communicated with the reverse rotation port C2, and the control port of the reverse rotation overflow valve M is communicated with the seventh oil passage F.
[0043] For example, when the auxiliary arm rotary cylinder C needs to be rotated forward, the second switching valve H can be switched to the fourth working position H2, so that the hydraulic oil can enter the seventh oil path F, and then enter the forward rotation port C1 through the forward rotation check valve J to rotate forward. At this time, the pressure in the seventh oil path F will rise due to the oil entering the seventh oil path F, and the control port of the reverse overflow valve M is communicated with the seventh oil path F, so that the reverse overflow valve M is opened, that is, the outlet is communicated with the inlet. In this way, the hydraulic oil in the reverse rotation port C2 can flow through the reverse overflow valve M to be discharged, reducing the pressure in the auxiliary arm rotary cylinder C.
[0044] When the auxiliary arm rotary cylinder C needs to be reversed, the second switching valve H can be switched to the third working position, so that the hydraulic oil can enter the eighth oil path G, and then enter the reverse rotation port C2 through the reverse rotation check valve L to rotate in reverse. At this time, the pressure in the eighth oil path G will rise due to the oil entering the eighth oil path G, and the control port of the forward overflow valve K is communicated with the eighth oil path G, so that the forward overflow valve K is opened, that is, the outlet is communicated with the inlet. In this way, the hydraulic oil in the forward rotation port C1 can flow through the forward overflow valve K to be discharged, reducing the pressure in the auxiliary arm rotary cylinder C.
[0045] In an embodiment, referring to Figure 1 , the hydraulic system 1000 comprises a main proportional valve N and an auxiliary proportional valve P, the main proportional valve N has a first oil port N1 and a second oil port N2, the first oil port N1 is communicated with the first working oil path 300, and the second oil port N2 is communicated with the second working oil path 400. The auxiliary proportional valve P has a third oil port P1 and a fourth oil port P2, the third oil port P1 is communicated with the third working oil path 500, and the fourth oil port P2 is communicated with the fourth working oil path 600.
[0046] For example, when the main arm telescopic cylinder 100 is telescoped, the auxiliary proportional valve P can be switched to the second working position A2 by the first switching valve A, and the hydraulic oil in the auxiliary proportional valve P is combined to the main arm telescopic cylinder 100. When the main arm telescopic cylinder 100 is telescoped to the destination, the first switching valve A can be switched to the first working position A1 or lose power, and the main arm telescopic cylinder 100 can be controlled by the main proportional valve N alone.
[0047] In this way, the auxiliary arm telescopic cylinder 200 is supplied with oil by the auxiliary proportional valve P, and the main arm telescopic cylinder 100 is supplied with oil by the main proportional valve N. The telescoping of the main arm telescopic cylinder 100 and the telescoping of the auxiliary arm telescopic cylinder 200 cannot be performed simultaneously. On the one hand, smooth and stepless changes can be realized to accurately control the extension and retraction of the auxiliary arm telescopic cylinder 200 and the main arm telescopic cylinder 100. On the other hand, proportional valves have the characteristics of rapid response to quickly respond and realize the telescoping of the main arm telescopic cylinder 100 and the auxiliary arm telescopic cylinder 200. On the other hand, the proportional valve can accurately control the output of the hydraulic oil to reduce the consumption of energy, thereby saving costs and improving efficiency.
[0048] In one embodiment, referring to Figure 1 , the hydraulic system 1000 comprises a balance valve Q, the balance valve Q has a first working port Q1, a second working port Q2 and a pilot port Q3, the first working port Q1 is communicated with the fifth oil path D, the second working port Q2 is communicated with the auxiliary rodless chamber 201, and the pilot port Q3 is communicated with the sixth oil path E.
[0049] For example, the balance valve Q can be arranged on the fifth oil path D, the balance valve Q can be a combination of a one-way valve and a throttle valve, the first working port Q1 can be the inlet of the one-way valve, the second working port Q2 can be the outlet of the one-way valve, and the pilot port Q3 can be communicated with the sixth oil path E. Here, when the fifth oil path D is the oil supply oil path and the sixth oil path E is the oil return oil path, the hydraulic oil in the fifth oil path D can enter the auxiliary rodless chamber 201 through the balance valve Q to perform the extension work; when the fifth oil path D is the oil return oil path and the sixth oil path E is the oil supply oil path, when the pilot port Q3 detects that the pressure of the sixth oil path E is greater than the opening pressure of the balance valve Q, the first working port Q1 and the second working port Q2 are communicated, at this time, the hydraulic oil in the auxiliary rodless chamber 201 can be discharged through the balance valve Q.
[0050] In one embodiment, referring to Figure 1 , the hydraulic system 1000 comprises a third overflow valve R and a third one-way valve T, the third overflow valve R and the third one-way valve T are connected in parallel on the sixth oil path E, the inlet of the third overflow valve R is communicated with the auxiliary rod chamber 202, the control port of the third overflow valve R is communicated with the fifth oil path D, and the outlet of the third one-way valve T is communicated with the auxiliary rod chamber 202.
[0051] In this way, when the fifth oil path D is the oil return oil path and the sixth oil path E is the oil supply oil path, the hydraulic oil in the sixth oil path E can enter the auxiliary rod chamber 202 through the third one-way valve T to perform the retraction work; when the fifth oil path D is the oil supply oil path and the sixth oil path E is the oil return oil path, when the control port of the third overflow valve R detects that the pressure of the fifth oil path D is greater than the opening pressure of the third overflow valve R, the inlet and the outlet are communicated, at this time, the hydraulic oil in the auxiliary rod chamber 202 can be discharged through the third overflow valve R.
[0052] Another aspect of the present application provides a work machine comprising the telescopic arm of any one of the above embodiments.
[0053] The work machine provided by the present application has the advantages of the hydraulic system 1000, so that the work machine can quickly realize the telescopic work and has high telescopic efficiency.
[0054] The above descriptions are only the preferred embodiments of the present application, not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A hydraulic system, characterized in that, include: The main boom telescopic cylinder has a main rodless chamber and a main rod chamber; A first working oil circuit and a second working oil circuit, wherein the first working oil circuit is connected to the main rodless cavity and the second working oil circuit is connected to the main rod cavity; The auxiliary boom telescopic cylinder has an auxiliary rodless chamber and an auxiliary rod chamber; The system comprises a first oil circuit, a second oil circuit, and a third oil circuit. The first oil circuit can selectively connect to the auxiliary rod chamber or the auxiliary rodless chamber. The second oil circuit connects to the main rod chamber, and the third oil circuit connects to the main rodless chamber. The third working oil circuit and the fourth working oil circuit are connected to each other, and the fourth working oil circuit can be selectively connected to the first oil circuit or the second oil circuit.
2. The hydraulic system according to claim 1, characterized in that, The hydraulic system includes a first switching valve, which has a first working position and a second working position. When the first switching valve is switched to the first working position, the third working oil circuit is cut off from the third oil circuit, and the fourth working oil circuit is connected to the first oil circuit. When the first switching valve is switched to the second working position, the third working oil circuit is connected to the third oil circuit, and the fourth working oil circuit is connected to the second oil circuit.
3. The hydraulic system according to claim 2, characterized in that, The hydraulic system includes a fourth oil circuit and a secondary boom slewing cylinder. The secondary boom slewing cylinder has a forward rotation port and a reverse rotation port. One end of the fourth oil circuit can be selectively connected to the forward rotation port or the reverse rotation port. When the first switching valve is in the first working position, the other end of the fourth oil circuit is connected to the third working oil circuit.
4. The hydraulic system according to claim 3, characterized in that, The hydraulic system includes a fifth oil circuit, a sixth oil circuit, a seventh oil circuit, an eighth oil circuit, and a second switching valve. The fifth oil circuit is connected to the auxiliary rodless chamber, the sixth oil circuit is connected to the auxiliary rod chamber, the seventh oil circuit is connected to the forward rotation port, and the eighth oil circuit is connected to the reverse rotation port. The second switching valve has a third working position and a fourth working position. When the second switching valve is in the third working position, the fourth oil circuit is connected to the eighth oil circuit, and the first oil circuit is connected to the sixth oil circuit. When the second switching valve is in the fourth working position, the fourth oil circuit is connected to the seventh oil circuit, and the third oil circuit is connected to the fifth oil circuit.
5. The hydraulic system according to claim 4, characterized in that, The hydraulic system includes a forward rotation check valve, a forward rotation relief valve, a reverse rotation check valve, and a reverse rotation relief valve. The forward rotation check valve is located on the seventh oil circuit, with its outlet connected to the forward rotation port and its inlet connected to the forward rotation port. The control port of the forward rotation relief valve is connected to the eighth oil circuit. The reverse rotation check valve is located on the seventh oil circuit, with its outlet connected to the reverse rotation port and its inlet connected to the reverse rotation port. The control port of the reverse rotation relief valve is connected to the seventh oil circuit.
6. The hydraulic system according to claim 4, characterized in that, The hydraulic system includes a balance valve, which has a first working port, a second working port, and a pilot port. The first working port is connected to the fifth oil circuit, the second working port is connected to the auxiliary rodless chamber, and the pilot port is connected to the sixth oil circuit.
7. The hydraulic system according to claim 4, characterized in that, The hydraulic system includes a third relief valve and a third check valve. The third relief valve and the third check valve are connected in parallel to the sixth oil circuit. The inlet of the third relief valve is connected to the auxiliary rod chamber, the control port of the third relief valve is connected to the fifth oil circuit, and the outlet of the third check valve is connected to the auxiliary rod chamber.
8. The hydraulic system according to claim 1, characterized in that, The hydraulic system includes a main proportional valve and a secondary proportional valve. The main proportional valve has a first port and a second port. The first port is connected to the first working oil circuit, and the second port is connected to the second working oil circuit. The secondary proportional valve has a third port and a fourth port. The third port is connected to the third working oil circuit, and the fourth port is connected to the fourth working oil circuit.
9. A telescopic arm, characterized in that, Includes the hydraulic system described in any one of claims 1 to 8.
10. A type of operating machinery, characterized in that, Includes the telescopic arm as described in claim 9.