Duplex oil cylinder, telescopic arm and operation machine
By designing a dual-cylinder system, the coordinated drive of the first and second telescopic cylinders solves the problem of poor stability when driven by a single cylinder, achieving more stable telescopic boom operation and greater driving force, thus adapting to complex environments.
Patent Information
- Application Number
- CN202423319093.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The telescopic booms of existing construction machinery are driven by a single hydraulic cylinder, which results in poor stability and insufficient driving force, making it difficult to operate stably in complex environments.
The system employs a dual-cylinder system, including first and second telescopic cylinders. Through the design of connecting oil circuits and working oil circuits, the cylinders are driven in tandem, providing balanced support force and greater driving force, reducing swaying and swinging, and adapting to complex environments.
It improves the working stability and load capacity of the telescopic boom, reduces swaying, is highly adaptable, and can operate stably in complex environments.
Smart Images
Figure CN223767813U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engineering machinery technology, and in particular to a double hydraulic cylinder, a telescopic boom, and a working machine. Background Technology
[0002] Operating machinery such as cranes uses hydraulic cylinders to extend or retract their telescopic booms. In related technologies, the telescopic booms of operating machinery often use a single hydraulic cylinder for sequential extension and retraction, resulting in poor stability. Utility Model Content
[0003] In view of this, the embodiments of this application aim to provide a double hydraulic cylinder, a telescopic boom, and a working machine with good working stability.
[0004] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:
[0005] One embodiment of this application discloses a double hydraulic cylinder, including:
[0006] The first telescopic cylinder includes a first cylinder barrel, a core tube, and a first piston rod assembly. The core tube is disposed inside the first cylinder barrel, and the first piston rod assembly is sleeved on the outer periphery of the core tube and slidably disposed inside the first cylinder barrel to define a first rodless chamber and a first rod chamber.
[0007] The second telescopic cylinder includes a second cylinder and a second piston rod assembly. The second piston rod assembly is slidably disposed in the second cylinder to define a second rodless chamber and a second rod chamber.
[0008] A first connecting oil circuit and a second connecting oil circuit, wherein the first connecting oil circuit connects the first rodless cavity and the second rodless cavity, and the second connecting oil circuit connects the first end of the core tube and the second rod cavity;
[0009] The first rodless cavity is connected to the first oil port, the second end of the core tube and the first rod cavity are connected to the second oil port, one of the first oil port and the second oil port is configured as an oil outlet, and the other of the first oil port and the second oil port is configured as an oil return port.
[0010] In one embodiment, the first rod chamber includes a first primary rod chamber and a first stage rod chamber; the first piston rod assembly includes a first primary piston rod and a first stage piston rod; the first primary piston rod is slidably disposed within the first cylinder to define the first rodless chamber and the first primary rod chamber; the first stage piston rod is slidably disposed within the first primary piston rod to define the first stage rod chamber; the first stage rod chamber communicates with the first primary rod chamber and the second port; and / or,
[0011] The second rod chamber includes a second primary rod chamber and a second secondary rod chamber. The second piston rod assembly includes a second primary piston rod and a second secondary piston rod. The second primary piston rod is slidably disposed within the second cylinder to define the second rodless chamber and the second primary rod chamber. The second secondary piston rod is slidably disposed within the second primary piston rod to define the second secondary rod chamber. The second secondary rod chamber connects the second primary rod chamber and the second connecting oil passage.
[0012] In one embodiment, the core tube includes a primary telescopic tube, a secondary telescopic tube, and a sub-stage telescopic tube. The sub-stage telescopic tube is fixedly disposed within the first primary piston rod, the secondary telescopic tube is fixedly disposed within the first primary piston rod, a portion of the secondary telescopic tube is slidably disposed within the sub-stage telescopic tube, the primary telescopic tube is fixedly disposed within the first cylinder, a portion of the primary telescopic tube is slidably disposed within the secondary telescopic tube, the primary telescopic tube is connected to the second connecting oil passage, and the sub-stage telescopic tube is connected to the second oil port.
[0013] In one embodiment, the double hydraulic cylinder includes a second working oil circuit, which connects the second oil port, the second end of the core tube, and the first rod cavity. The second working oil circuit includes a second main working oil circuit, a second primary working oil circuit, and a second stage working oil circuit. The second main working oil circuit connects to the second oil port, the second primary working oil circuit connects to the second main working oil circuit and the first rod cavity, and the second stage working oil circuit connects to the second main working oil circuit and the second end of the core tube.
[0014] In one embodiment, the double hydraulic cylinder includes a first sequence valve group, which includes a first relief valve and a first check valve. The first relief valve and the first check valve are connected in parallel in the second primary working oil circuit. The outlet of the first relief valve is connected to the first rod chamber, and the outlet of the first check valve is connected to the second main working oil circuit; and / or,
[0015] The double cylinder includes a second sequence valve group, which includes a second relief valve and a second check valve. The second relief valve and the second check valve are connected in parallel in the first connecting oil circuit. The outlet of the second relief valve is connected to the second rodless chamber, and the inlet of the first check valve is connected to the second rodless chamber.
[0016] In one embodiment, the double hydraulic cylinder includes a hydraulically controlled check valve, which is disposed in the connecting oil circuit between the second sequential valve group and the second rodless chamber, and the control port of the hydraulically controlled check valve is connected to the second connecting oil circuit.
[0017] In one embodiment, the double hydraulic cylinder includes a first working oil circuit, which connects the first rodless chamber and the first oil port. The double hydraulic cylinder includes a balance valve, which is disposed on the first working oil circuit. The balance valve has a first working port, a second working port, and a pilot port. The first working port connects to the first oil port, the second working port connects to the first rodless chamber, and the pilot port connects to the second main working oil circuit.
[0018] In one embodiment, the extension direction of the first telescopic cylinder or the second telescopic cylinder is a first direction, and the first telescopic cylinder and the second telescopic cylinder are slidably connected along the first direction.
[0019] In one embodiment, the double cylinder includes a tray disposed on the second cylinder barrel, the tray having a guide groove extending along the first direction, and a pulley formed on the first cylinder barrel, the pulley sliding in cooperation with the guide groove.
[0020] Another aspect of this application discloses a telescopic boom, including a main boom, a secondary boom, and a double hydraulic cylinder as described in any of the above embodiments. The main boom and the secondary boom are movably connected, and at least one of the main boom and the secondary boom is provided with the double hydraulic cylinder.
[0021] Another aspect of this application discloses a working machine, including the telescopic boom described in the above embodiments.
[0022] This application discloses a double hydraulic cylinder, a telescopic boom, and a working machine. By setting a first telescopic cylinder and a second telescopic cylinder to cooperate in extending or retracting the boom, the double hydraulic cylinder provides more balanced support force and greater stability during extension and retraction compared to a single cylinder. Furthermore, the double hydraulic cylinder provides greater driving force than a single cylinder, meaning the telescopic boom can bear heavier loads. Additionally, the simultaneous operation of the first and second cylinders reduces swaying and swinging during extension, resulting in smoother operation. Moreover, the double hydraulic cylinder, based on the extension and retraction of the first and second cylinders, allows operation in complex environments and offers strong adaptability. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a telescopic arm provided in an embodiment of this application;
[0024] Figure 2 A schematic diagram of a double hydraulic cylinder provided in another embodiment of this application;
[0025] Figure 3 for Figure 2A schematic diagram of the structure of the first telescopic cylinder, the second telescopic cylinder, and the tray;
[0026] Figure 4 A hydraulic schematic diagram of a double-cylinder is provided as another embodiment of this application.
[0027] Explanation of reference numerals in the attached figures
[0028] 1000. Telescopic boom; 100. Double cylinder; 1. First telescopic cylinder; 1a. First rodless chamber; 1b. First rod chamber; 1b1. First primary rod chamber; 1b2. First primary rod chamber; 11. First cylinder barrel; 12. Core tube; 12a. First end of core tube; 12b. Second end of core tube; 13. First piston rod assembly; 131. First primary piston rod; 131a. First primary oil passage; 132. First primary piston rod; 132a. First primary oil passage; 132b. First primary oil passage; 2. Second telescopic cylinder; 2a. Second rodless chamber; 2b. Second rod chamber; 2b1. Second primary rod chamber; 2b2. Second primary rod chamber; 21. Second cylinder barrel; 22. Second piston rod assembly; 221. Second primary piston rod; 221a. Second primary oil passage; 222. Second primary piston rod; 222a. Second primary oil passage; 222b, Secondary oil circuit; 3, First connecting oil circuit; 4, Second connecting oil circuit; 5, First working oil circuit; 6, Second working oil circuit; 6a, Secondary main working oil circuit; 6b, Secondary primary working oil circuit; 6c, Secondary working oil circuit; 7, Tray; 8, Pulley; 9, First sequence valve assembly; 91, First relief valve; 92, First check valve; 10, Second sequence valve assembly; 101, Second relief valve; 102 1. Second check valve; 200. First protective oil circuit; 300. Second protective oil circuit; 400. Third check valve; 500. Hydraulic control check valve; 600. Balance valve; 601. First working port; 602. Second working port; 603. Pilot port; 700. Arm section; 701. First arm section; 702. Second arm section; 703. Third arm section; 704. Fourth arm section; 705. Fifth arm section; 706. Sixth arm section. Detailed Implementation
[0029] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.
[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0031] To better understand the double hydraulic cylinder 100 provided in this application, the telescopic boom 1000 will be described first.
[0032] One embodiment of this application provides a telescopic boom 1000, which includes a main boom, a secondary boom, and a double hydraulic cylinder 100 as described in any of the following embodiments. The main boom and the secondary boom are movably connected, and at least one of the main boom and the secondary boom is provided with a double hydraulic cylinder.
[0033] For example, the telescopic boom 1000 includes multiple boom sections 700, each boom section 700 can be extended or retracted by a double hydraulic cylinder 100.
[0034] Another embodiment of this application provides a double hydraulic cylinder 100, please refer to... Figures 1 to 4 The double-cylinder 100 includes a first telescopic cylinder 1, a second telescopic cylinder 2, a first connecting oil passage 3, and a second connecting oil passage 4. The first telescopic cylinder 1 includes a first cylinder barrel 11, a core tube 12, and a first piston rod assembly 13. The core tube 12 is disposed within the first cylinder barrel 11, and the first piston rod assembly 13 is sleeved around the outer periphery of the core tube 12 and slidably disposed within the first cylinder barrel 11 to define a first rodless chamber 1a and a first rod chamber 1b. The second telescopic cylinder 2 includes a second cylinder barrel 21 and a second piston rod assembly 22. The second piston rod assembly 22 is slidably disposed within the second cylinder barrel 21 to define a second rodless chamber 2a and a second rod chamber 2b. The first connecting oil passage 3 connects the first rodless chamber 1a and the second rodless chamber 2a, and the second connecting oil passage 4 connects the first end 12a of the core tube and the second rod chamber 2b. The first rodless cavity 1a is connected to the first oil port, the second end 12b of the core tube and the first rod cavity 1b are connected to the second oil port, one of the first oil port and the second oil port is configured as an oil outlet, and the other of the first oil port and the second oil port is configured as an oil return port.
[0035] For example, a hydraulic pump can be used to configure one of the first and second oil ports as an oil outlet and the other as an oil return port.
[0036] The double hydraulic cylinder 100 provided in this application, when the first oil port is the oil outlet and the second oil port is the oil return port, hydraulic oil can enter the first rodless chamber 1a through the first oil port to drive the first piston rod assembly 13 to extend out of the first cylinder 11. Excess hydraulic oil can enter the second rodless chamber 2a through the first connecting oil passage 3 to drive the second piston rod assembly 22 to extend out of the second cylinder 21. The hydraulic oil in the second rodless chamber 2a can enter the first end 12a of the core tube through the second connecting oil passage 4, and then flow out from the second end 12b of the core tube and flow back to the second oil port for replenishment. The first rod chamber 1... The hydraulic oil in port b can flow back to the second port for replenishment. When the first port is the return port and the second port is the outlet port, the hydraulic oil can enter the first rod chamber 1b and the core tube 12 through the second port. The hydraulic oil in the first rod chamber 1b can drive the first piston rod assembly 13 to retract into the first cylinder 11. The hydraulic oil in the core tube 12 can enter the second rod chamber 2b through the second connecting oil passage 4 to drive the second piston rod assembly 22 to retract into the second cylinder 21. The hydraulic oil in the second rod chamber 2b can enter the first rodless chamber 1a through the first connecting oil passage 3 and then flow back to the first port. In this way, by setting up the first telescopic cylinder 1 and the second telescopic cylinder 2 to cooperate in extending or retracting the arm, on the one hand, the use of a double-cylinder drive can provide a more balanced support force, making it more stable during extension and retraction; on the other hand, compared with the extension and retraction driven by a single cylinder, the double-cylinder 100 provided in this application can provide a greater driving force, meaning that the telescopic arm 1000 can bear a heavier load; furthermore, the simultaneous operation of the first telescopic cylinder 1 and the second telescopic cylinder 2 can reduce swaying and swinging during the extension and retraction process, making the extension and retraction work smoother; and finally, the double-cylinder 100, based on the extension or retraction of the first telescopic cylinder 1 and the second telescopic cylinder 2, can operate in complex environments and has strong adaptability.
[0037] The telescopic boom 1000 provided in this application has good working stability and strong load capacity due to the advantages of the double hydraulic cylinder 100.
[0038] In one embodiment, please refer to Figures 1 to 3 The extension and retraction direction of the first telescopic cylinder 1 or the second telescopic cylinder 2 is the first direction, and the first telescopic cylinder 1 and the second telescopic cylinder 2 are slidably connected along the first direction.
[0039] For example, the first cylinder 11 is slidably disposed on the second cylinder 21 along a first direction. In this way, the first telescopic cylinder 1 or the second telescopic cylinder 2 can slide along the first direction so that the first telescopic cylinder 1 and the second telescopic cylinder 2 are side by side or extended. This not only extends the extension length of the double cylinder 100, but also reduces the space occupied by the double cylinder 100 when not in use, making it convenient for transportation and placement.
[0040] In one exemplary embodiment, Figure 1 R1 in the equation can be the first direction.
[0041] In one embodiment, please refer to Figures 1 to 3 The double cylinder 100 includes a tray 7, which is disposed on the second cylinder 21. The tray 7 has a guide groove extending in a first direction. A pulley 8 is formed on the first cylinder 11, and the pulley 8 slides in cooperation with the guide groove.
[0042] For example, the tray 7 can be mounted on the second cylinder 21 by a clamp. The tray 7 has a guide groove extending in the first direction. The first cylinder 11 has a pulley 8 at one end in the first direction. The pulley 8 is slidably mounted in the guide groove for sliding engagement.
[0043] In this way, by setting up the tray 7 and the pulley 8, the tray 7 forms a guide groove. On the one hand, the guide groove can provide a smooth and accurate movement path, and the pulley 8 can slide easily in the guide groove, making the whole movement process more precise and controllable. On the other hand, the guide groove can provide additional support and stability, preventing the pulley 8 from shaking or sliding unstably during the movement, thus ensuring good movement stability.
[0044] In one embodiment, please refer to Figure 4 The double hydraulic cylinder includes a second working oil circuit 6, which connects to a second oil port, the second end 12b of the core tube, and the first rod chamber 1b. The second working oil circuit 6 includes a second main working oil circuit 6a, a second primary working oil circuit 6b, and a second stage working oil circuit 6c. The second main working oil circuit 6a connects to the second oil port, the second primary working oil circuit 6b connects to the second main working oil circuit 6a and the first rod chamber 1b, and the second stage working oil circuit 6c connects to the second main working oil circuit 6a and the second end 12b of the core tube.
[0045] In this way, by setting up a second main working oil circuit 6a, a second primary working oil circuit 6b, and a second secondary working oil circuit 6c, the pressure in the second working oil circuit 6 can be reduced, making it faster and smoother when driving the double cylinder 100 to extend or retract, reducing the problem of the piston rod not extending or retracting smoothly, and improving stability.
[0046] In one embodiment, please refer to Figure 4 The first rod chamber 1b includes a first primary rod chamber 1b1 and a first primary rod chamber 1b2. The first piston rod assembly 13 includes a first primary piston rod 131 and a first primary piston rod 132. The first primary piston rod 131 is slidably disposed within the first cylinder 11 to define the first rodless chamber 1a and the first primary rod chamber 1b1. The first primary piston rod 132 is slidably disposed within the first primary piston rod 131 to define the first primary rod chamber 1b2. The first primary rod chamber 1b2 connects the first primary rod chamber 1b1 and the second oil port.
[0047] For example, the first primary piston rod 131 can be disposed through a first direction, and the first primary piston rod 132 is disposed inside the first primary piston rod 131, such that the first primary piston rod 131 and the first primary piston rod 132 share a first rodless cavity 1a. The rod portion of the first primary piston rod 131 defines a first primary rod cavity 1b1 between itself and the first cylinder 11, and the rod portion of the first primary piston rod 132 defines a first primary rod cavity 1b2 between itself and the inner wall of the first primary piston rod 131. A first primary oil passage 132a and a first primary oil circuit 132b are formed inside the first primary piston rod 132. The first primary oil passage 132a connects the second working oil circuit 6 and the first primary rod cavity 1b2, and the first primary oil circuit 132b connects the first working oil circuit 5 and the first rodless cavity 1a. A first primary oil passage 131a is formed inside the first primary piston rod 131, and the first primary oil passage 131a connects the first primary rod cavity 1b2 and the first primary rod cavity 1b1.
[0048] Here, when hydraulic oil enters the first rodless chamber 1a from the first working oil circuit 5 through the first primary oil circuit 132b, since the first primary piston rod 132 is located inside the first primary piston rod 131, the hydraulic oil first pushes the first primary piston rod 132 out of the first primary piston rod 131. When the first primary piston rod 132 extends to the designated position, the pressure in the first rodless chamber 1a will rise to a certain pressure, and then it can push the first primary piston rod 131 out of the first cylinder 11. The hydraulic oil in the first primary rod chamber 1b1 can enter the first primary rod chamber 1b2 through the first primary oil passage 131a, and then enter the second working oil circuit 6 through the first primary oil passage 132a and flow back to the second oil port. When hydraulic oil enters the first-stage rod chamber 1b2 from the second working oil circuit 6 through the first-stage oil passage 132a, and then enters the first-stage rod chamber 1b1 through the first primary oil passage 131a, since the cross-sectional area of the first-stage piston rod 132 is smaller than that of the first primary piston rod 131, the first-stage piston rod 132 retracts into the first primary piston rod 131 first, and then the first primary piston rod 131 retracts into the first cylinder 11. The hydraulic oil in the first rodless chamber 1a can then enter the first working oil circuit 5 through the first-stage oil passage 132b, and finally flow back to the first oil port.
[0049] In this way, by setting the first primary piston rod 131, the first primary piston rod 132, and the first cylinder 11, the extension length of the double hydraulic cylinder 100 can be extended to meet the large stroke extension and retraction requirements of the telescopic arm 1000.
[0050] In one embodiment, please refer to Figure 4The second rod chamber 2b includes a second primary rod chamber 2b1 and a second secondary rod chamber 2b2. The second piston rod assembly 22 includes a second primary piston rod 221 and a second secondary piston rod 222. The second primary piston rod 221 is slidably disposed within the second cylinder 21 to define the second rodless chamber 2a and the second primary rod chamber 2b1. The second secondary piston rod 222 is slidably disposed within the second primary piston rod 221 to define the second secondary rod chamber 2b2. The second secondary rod chamber 2b2 connects to the second primary rod chamber 2b1 and the second connecting oil passage 4.
[0051] For example, the second primary piston rod 221 can be disposed through the first direction, and the second secondary piston rod 222 is disposed inside the second primary piston rod 221, such that the second primary piston rod 221 and the second secondary piston rod 222 share a second rodless cavity 2a. The rod portion of the second primary piston rod 221 defines a second primary rod cavity 2b1 between itself and the second cylinder 21, and the rod portion of the second secondary piston rod 222 defines a second secondary rod cavity 2b2 between itself and the inner wall of the second primary piston rod 221. A second secondary oil passage 222a and a second secondary oil circuit 222b are formed inside the second secondary piston rod 222. The second secondary oil passage 222a connects the second connecting oil circuit 4 and the second secondary rod cavity 2b2, and the second secondary oil circuit 222b connects the first connecting oil circuit 3 and the second rodless cavity 2a. A second primary oil passage 221a is formed inside the second primary piston rod 221, and the second primary oil passage 221a connects the second secondary rod cavity 2b2 and the second primary rod cavity 2b1.
[0052] Here, when hydraulic oil enters the second rodless chamber 2a from the first connecting oil passage 3 through the second stage oil passage 222b, since the second stage piston rod 222 is located inside the second primary piston rod 221, the hydraulic oil first pushes the second stage piston rod 222 out of the second primary piston rod 221. When the second stage piston rod 222 extends to the designated position, the pressure in the second rodless chamber 2a will rise to a certain pressure, and then it can push the second primary piston rod 221 out of the second cylinder 21. The hydraulic oil in the second primary rod chamber 2b1 can enter the second stage rod chamber 2b2 through the second primary oil passage 221a, and then flow to the second connecting oil passage 4 through the second stage oil passage 222a. When hydraulic oil enters the second rod chamber 2b2 from the second connecting oil passage 4 through the second stage oil passage 222a, and then enters the second primary rod chamber 2b1 through the second primary oil passage 221a, since the cross-sectional area of the second stage piston rod 222 is smaller than that of the second primary piston rod 221, the second stage piston rod 222 retracts into the second primary piston rod 221 first, and then the second primary piston rod 221 retracts into the second cylinder 21. The hydraulic oil in the second rodless chamber 2a can then enter the first connecting oil passage 3 through the second stage oil passage 222b.
[0053] In this way, by setting the second primary piston rod 221, the second secondary piston rod 222, and the second cylinder 21, the extension length of the double hydraulic cylinder 100 can be extended to meet the large stroke extension and retraction requirements of the telescopic arm 1000.
[0054] In one embodiment, please refer to Figure 4 The first rod chamber 1b includes a first primary rod chamber 1b1 and a first primary rod chamber 1b2. The first piston rod assembly 13 includes a first primary piston rod 131 and a first primary piston rod 132. The first primary piston rod 131 is slidably disposed within the first cylinder 11 to define the first rodless chamber 1a and the first primary rod chamber 1b1. The first primary piston rod 132 is slidably disposed within the first primary piston rod 131 to define the first primary rod chamber 1b2. The first primary rod chamber 1b2 is connected to the second working oil passage 6. The second rod chamber 2b includes a second primary rod chamber 2b1 and a second secondary rod chamber 2b2. The second piston rod assembly 22 includes a second primary piston rod 221 and a second secondary piston rod 222. The second primary piston rod 221 is slidably disposed within the second cylinder 21 to define the second rodless chamber 2a and the second primary rod chamber 2b1. The second secondary piston rod 222 is slidably disposed within the second primary piston rod 221 to define the second secondary rod chamber 2b2. The second secondary rod chamber 2b2 connects to the second primary rod chamber 2b1 and the second connecting oil passage 4.
[0055] Here, when hydraulic oil enters the first rodless chamber 1a from the first working oil passage 5 through the first primary oil passage 132b, the first rodless chamber 1a is connected to the second rodless chamber 2a through the first connecting oil passage 3. In the first rodless chamber 1a, since the first primary piston rod 132 is located inside the first primary piston rod 131, the hydraulic oil first pushes the first primary piston rod 132 out of the first primary piston rod 131. When the first primary piston rod 132 extends to the designated position, the pressure in the first rodless chamber 1a will rise to a certain pressure, and then it can push the first primary piston rod 131 out of the first cylinder 11. In the second rodless chamber 2a, since the second primary piston rod 222 is located inside the second primary piston rod 221, the hydraulic oil first pushes the second primary piston rod 222 out of the first primary piston rod 11. The piston rod 222 extends out of the second primary piston rod 221. When the second primary piston rod 222 extends to the designated position, the pressure in the second rodless chamber 2a will rise to a certain pressure, which will then push the second primary piston rod 221 out of the second cylinder 21. The hydraulic oil in the second primary rod chamber 2b1 can enter the second primary rod chamber 2b2 through the second primary oil passage 221a, and then flow to the second connecting oil passage 4 through the second primary oil passage 222a. Subsequently, it flows into the second working oil passage 6 through the core tube 12. The hydraulic oil in the first primary rod chamber 1b1 can enter the first primary rod chamber 1b2 through the first primary oil passage 131a, and then enter the second working oil passage 6 through the first primary oil passage 132a. After the two flow into each other, they flow back to the second oil port. When hydraulic oil enters the first-stage rod chamber 1b2 from the second working oil circuit 6 through the first-stage oil passage 132a, and then enters the second-stage rod chamber 2b2 through the core tube 12, the second connecting oil circuit 4, and the second-stage oil passage 222a, in the first rod chamber 1b, because the cross-sectional area of the first-stage piston rod 132 is smaller than that of the first primary piston rod 131, the first-stage piston rod 132 first retracts into the first primary piston rod 131, and then the first primary piston rod 131 retracts into the first cylinder 11. In the second rod chamber 2b... Because the cross-sectional area of the second-stage piston rod 222 is smaller than that of the second-stage piston rod 221, the second-stage piston rod 222 retracts into the second-stage piston rod 221 first, and then the second-stage piston rod 221 retracts into the second cylinder 21. The hydraulic oil in the second rodless chamber 2a can enter the first connecting oil passage 3 through the second-stage oil passage 222b, and then flow through the first rodless chamber 1a to the first-stage oil passage 132b to merge with the hydraulic oil flowing out of the first rod chamber 1b before entering the first working oil passage 5, and finally flowing to the first oil port.
[0056] In this way, by setting the first primary piston rod 131, the first stage piston rod 132 and the first cylinder 11, as well as the second primary piston rod 221, the second stage piston rod 222 and the second cylinder 21, the extension length of the double hydraulic cylinder 100 can be further extended to meet the large stroke extension requirements of the telescopic arm 1000.
[0057] In one embodiment, the core tube 12 includes a primary telescopic tube, a secondary telescopic tube, and a sub-stage telescopic tube. The sub-stage telescopic tube is fixedly disposed within the primary piston rod 132, the secondary telescopic tube is fixedly disposed within the primary piston rod 131, and a portion of the secondary telescopic tube is slidably disposed within the sub-stage telescopic tube. The primary telescopic tube is fixedly disposed within the first cylinder 11, and a portion of the primary telescopic tube is slidably disposed within the secondary telescopic tube. The primary telescopic tube is connected to the second connecting oil passage 4, and the sub-stage telescopic tube is connected to the second oil port.
[0058] For example, one end of the sub-stage telescopic tube can be welded to the first primary piston rod 132, and the other end of the sub-stage telescopic tube is connected to the second working oil passage 6. One end of the secondary telescopic tube can be welded into the first primary piston rod 131, and the other end of the secondary telescopic tube can be slidably disposed within the sub-stage telescopic tube. The primary telescopic tube can be welded into the first cylinder 11 and connected to the second connecting oil passage 4, and the other end of the primary telescopic tube can be slidably disposed within the secondary telescopic tube.
[0059] In this way, when the first primary piston rod 131 extends or retracts from the first cylinder 11, it can cause the secondary telescopic tube to slide relative to the primary telescopic tube, thereby reducing the impact of hydraulic oil flow in the core tube 12; when the first primary piston rod 132 extends or retracts from the first primary piston rod 131, it can cause the secondary telescopic tube to slide relative to the daughter telescopic tube, thereby reducing the impact of hydraulic oil flow in the core tube 12. This can improve the stability of oil supply.
[0060] In one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a first sequence valve group 9, which includes a first relief valve 91 and a first check valve 92. The first relief valve 91 and the first check valve 92 are connected in parallel on the second primary working oil circuit 6b. The outlet of the first relief valve 91 is connected to the first rod chamber 1b, and the outlet of the first check valve 92 is connected to the second main working oil circuit 6a.
[0061] For example, the outlet of the first relief valve 91 can be connected to the first primary oil passage 132a through the second primary working oil passage 6b.
[0062] Here, when the second oil port is the outlet and the first oil port is the return port, when the hydraulic oil flows from the second main working oil circuit 6a to the connection point of the second primary working oil circuit 6b and the second secondary working oil circuit 6c, because the outlet of the first check valve 92 is connected to the second main working oil circuit 6a, the hydraulic oil cannot flow to the first rod chamber 1b through the first check valve 92. Furthermore, the first relief valve 91 has opening pressure, so the hydraulic oil also cannot flow to the first rod chamber 1b through the first relief valve 91. At this time, the hydraulic oil can only flow through the second secondary working oil circuit 6c via the core tube 12 to the second connecting oil circuit 4, and then into the second rod chamber 2b, causing the second piston rod assembly 22 to retract into the second cylinder 21, that is, the second-stage piston rod 222 retracts into the second cylinder 21. The second primary piston rod 221 retracts into the second cylinder 21. When the second piston rod assembly 22 retracts to the designated position, it can no longer retract. At this time, the pressure in the second main working oil circuit 6a will increase. When the pressure in the second main working oil circuit 6a is greater than the opening pressure of the first relief valve 91, the inlet and outlet of the first relief valve 91 can be connected. At this time, the hydraulic oil in the second main working oil circuit 6a can enter the first rod chamber 1b through the first relief valve 91 and the second primary working oil circuit 6b, so that the first piston rod assembly 13 retracts into the first cylinder 11, that is, the first primary piston retracts into the first primary piston rod 131, and the first primary piston rod 131 retracts into the first cylinder 11. When the first oil port is the outlet and the second oil port is the return port, the hydraulic oil in the second rod chamber 2b can flow through the second connecting oil passage 4 and the core tube 12 into the second primary working oil passage 6c, and then into the second main working oil passage 6a. Meanwhile, the hydraulic oil in the first rod chamber 1b can flow through the second primary working oil passage 6b and the first check valve 92 into the second main working oil passage 6a, where it flows into the second oil port together with the hydraulic oil in the second cylinder chamber. In other words, during the retraction operation, the second piston rod assembly 22 retracts first, and then the first piston rod assembly 13 retracts. This reduces the impact force generated when the first telescopic cylinder 1 and the second telescopic cylinder 2 retract simultaneously, which helps protect the double cylinder 100 and improves its service life.
[0063] In one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a second sequence valve group 10, which includes a second relief valve 101 and a second check valve 102. The second relief valve 101 and the second check valve 102 are connected in parallel in the first connecting oil circuit 3. The outlet of the second relief valve 101 is connected to the second rodless chamber 2a, and the inlet of the second check valve 102 is connected to the second rodless chamber 2a.
[0064] For example, the outlet of the second relief valve 101 can be connected to the second primary working oil passage 222b through the second primary working oil passage 6b.
[0065] Here, when the first oil port is the outlet and the second oil port is the return port, the hydraulic oil enters the first rodless chamber 1a from the first oil port through the first primary oil passage 132b, and then flows into the first connecting oil passage 3. Since the inlet of the second check valve 102 is connected to the second rodless chamber 2a, the hydraulic oil cannot flow into the second rodless chamber 2a through the second check valve 102. Furthermore, the second relief valve 101 has opening pressure, so the hydraulic oil also cannot flow into the second rodless chamber 2a through the second relief valve 101. At this time, the pressure in the first rodless chamber 1a increases, pushing the first piston rod assembly 13 out of the first cylinder 11, that is, the first primary piston rod 132 extends out of the first primary piston rod 131. Piston rod 131 extends out of first cylinder 11. When first piston rod assembly 13 extends to a designated position, it can no longer extend. At this time, the pressure in first connecting oil circuit 3 will increase. When the pressure in first connecting oil circuit 3 is greater than the opening pressure of second relief valve 101, the inlet and outlet of first relief valve 91 can be connected, so that hydraulic oil in first connecting oil circuit 3 can flow through first relief valve 91 to second stage oil circuit 222b, and then to second rodless chamber 2a, so that second piston rod assembly 22 extends out of second cylinder 21, that is, second stage piston extends to second primary piston rod 221, and second primary piston rod 221 extends out of second cylinder 21. When the second oil port is the outlet and the first oil port is the return port, the hydraulic oil in the second rodless chamber 2a can enter the first connecting oil circuit 3 through the second stage oil circuit 222b via the second check valve 102, then flow to the first rodless chamber 1a, and finally return to the first oil port through the first stage oil circuit 132b via the first working oil circuit 5. In other words, during the extension operation, the first piston rod assembly 13 extends first, followed by the second piston rod assembly 22. This reduces the impact force generated when the first telescopic cylinder 1 and the second telescopic cylinder 2 extend simultaneously, helping to protect the double cylinder 100 and extending its service life.
[0066] In one embodiment, please refer to Figure 4 The double-cylinder 100 includes a first sequence valve group 9 and a second sequence valve group 10. The first sequence valve group 9 includes a first relief valve 91 and a first check valve 92. The first relief valve 91 and the first check valve 92 are connected in parallel on the second primary working oil circuit 6b. The outlet of the first relief valve 91 is connected to the first rod chamber 1b, and the outlet of the first check valve 92 is connected to the second main working oil circuit 6a. The second sequence valve group 10 includes a second relief valve 101 and a second check valve 102. The second relief valve 101 and the second check valve 102 are connected in parallel on the first connecting oil circuit 3. The outlet of the second relief valve 101 is connected to the second rodless chamber 2a, and the inlet of the first check valve 92 is connected to the second rodless chamber 2a.
[0067] In this way, during the retraction phase, the second piston rod assembly 22 retracts first, followed by the first piston rod assembly 13; during the extension phase, the first piston rod assembly 13 extends first, followed by the second piston rod assembly 22. This further reduces the impact force generated when the first telescopic cylinder 1 and the second telescopic cylinder 2 operate simultaneously, helping to protect the double cylinder 100 and extend its service life.
[0068] As an example, in one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a first protective oil circuit 200, which connects the first relief valve 91 and the oil tank. When the pressure in the second primary working oil circuit 6b exceeds the working pressure of the first relief valve 91, it can flow back to the oil tank through the first protective oil circuit 200 to relieve pressure, thereby reducing damage to the first relief valve 91 and improving its service life.
[0069] As an example, in one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a second protective oil circuit 300 and a third check valve 400. The second protective oil circuit 300 is connected to the second relief valve 101 and the third check valve 400. The outlet of the third check valve 400 is connected to the second connecting oil circuit 4. When the pressure in the first connecting oil circuit 3 exceeds the working pressure of the first relief valve 91, it can flow through the second protective oil circuit 300 and the third check valve 400 to the second connecting oil circuit 4 for pressure relief, so as to reduce the damage to the second relief valve 101 and improve the service life of the second relief valve 101.
[0070] In one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a hydraulically controlled check valve 500, which is located in the first connecting oil circuit 3 between the second sequence valve group 10 and the second rodless chamber 2a. The control port of the hydraulically controlled check valve 500 is connected to the second connecting oil circuit 4.
[0071] Here, when the first oil port is the outlet and the second oil port is the return port, after the first piston rod assembly 13 extends, the hydraulic oil in the first connecting oil circuit 3 can enter the second stage oil circuit 222b through the second relief valve 101 and the hydraulic control check valve 500 to enter the second rodless chamber 2a, so that the second piston rod can extend. When the second oil port is the outlet and the first oil port is the return port, the hydraulic oil can enter the second rod chamber 2b through the second connecting oil circuit 4. When the pressure in the second connecting oil circuit 4 is greater than the opening pressure of the hydraulic control check valve, the inlet of the hydraulic control check valve 500 is connected to its outlet. At this time, the hydraulic oil in the second rodless chamber 2a can flow back to the first connecting oil circuit 3 through the hydraulic control check valve 500 and the second check valve 102. In this way, the extension stability of the second piston rod assembly 22 can be improved.
[0072] In one embodiment, please refer to Figure 4 The double hydraulic cylinder 100 includes a first working oil circuit 5, which connects the first rodless chamber 1a and the first oil port. The double hydraulic cylinder 100 includes a balance valve 600, which is disposed on the first working oil circuit 5. The balance valve 600 has a first working port 601, a second working port 602 and a pilot port 603. The first working port 601 connects to the first oil port, the second working port 602 connects to the first rodless chamber 1a, and the pilot port 603 connects to the second main working oil circuit 6a.
[0073] For example, the balance valve 600 can be a combination of a check valve and a throttle valve. The balance valve 600 has a first working port 601, a second working port 602, and a pilot port 603. The first working port 601 can be the inlet of the check valve, the second working port 602 can be the outlet of the check valve, and the pilot port 603 can be connected to the second main working oil circuit 6a. Here, when the first oil port is the outlet and the second oil port is the return port, the hydraulic oil in the first working oil circuit 5 can enter the first rodless chamber 1a through the balance valve 600 for extension work. When the first oil port is the return port and the second oil port is the outlet, when the pilot port 603 detects that the pressure of the second main working oil circuit 6a is greater than the opening pressure of the balance valve 600, its first working port 601 and second working port 602 are connected. At this time, the hydraulic oil in the first rodless chamber 1a can flow back to the first oil port through the first working oil circuit 5 via the balance valve 600. In this way, the retraction stability of the first piston rod assembly 13 can be improved.
[0074] In one embodiment, please refer to Figure 1 The telescopic boom 1000 includes six boom sections 700, which are, along a first direction, a first boom section 701, a second boom section 702, a third boom section 703, a fourth boom section 704, a fifth boom section 705, and a sixth boom section 706. A first cylinder 11 can be connected to the third boom section 703, a first primary piston rod 131 can be connected to the second boom section 702, a first primary piston rod 132 can be connected to the first boom section 701, a second cylinder 21 can be connected to the fourth boom section 704, a second primary piston rod 221 can be connected to the fifth boom section 705, and a second primary piston rod 222 can be connected to the sixth boom section 706. Thus, in the extension condition, the first boom section 701 extends first, followed by the second to sixth boom sections 702 to 706 in sequence; in the retraction condition, the sixth boom section 706 retracts first, followed by the fifth to first boom sections 705 to 701 in sequence.
[0075] In another aspect, this application provides a working machine, which includes the telescopic boom 1000 from any of the above embodiments. Based on the advantages of the telescopic boom 1000, the working machine provided by this application features good stability and strong load-bearing capacity.
[0076] For example, in one embodiment, the working machinery may be a crane or hoist, etc.
[0077] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. All modifications, equivalent substitutions, improvements, etc., within the spirit and principles of this application are included within the scope of protection of this application.
Claims
1. A double oil cylinder characterized by comprising: The double oil cylinder comprises a first telescopic oil cylinder, a second telescopic oil cylinder, a first communication oil path and a second communication oil path. The first telescopic oil cylinder comprises a first cylinder barrel, a core pipe and a first piston rod group, the core pipe is arranged in the first cylinder barrel, and the first piston rod group is sleeved outside a periphery of the core pipe and slidably arranged in the first cylinder barrel to define a first rodless chamber and a first rod chamber. The second telescopic oil cylinder comprises a second cylinder barrel and a second piston rod group, and the second piston rod group is slidably arranged in the second cylinder barrel to define a second rodless chamber and a second rod chamber. The first communication oil path communicates the first rodless chamber and the second rodless chamber, and the second communication oil path communicates a first end of the core pipe and the second rod chamber. The first rodless chamber is communicated with a first oil port, the second end of the core pipe and the first rod chamber are communicated with a second oil port, one of the first oil port and the second oil port is configured as an oil outlet, and the other of the first oil port and the second oil port is configured as an oil return port.
2. The twin ram cylinder of claim 1 wherein, The first rod chamber comprises a first primary rod chamber and a first secondary rod chamber, the first piston rod group comprises a first primary piston rod and a first secondary piston rod, the first primary piston rod is slidably arranged in the first cylinder barrel to define the first rodless chamber and the first primary rod chamber, and the first secondary piston rod is slidably arranged in the first primary piston rod to define the first secondary rod chamber, and the first secondary rod chamber is communicated with the first primary rod chamber and the second oil port. And / or, The second rod chamber comprises a second primary rod chamber and a second secondary rod chamber, the second piston rod group comprises a second primary piston rod and a second secondary piston rod, the second primary piston rod is slidably arranged in the second cylinder barrel to define the second rodless chamber and the second primary rod chamber, and the second secondary piston rod is slidably arranged in the second primary piston rod to define the second secondary rod chamber, and the second secondary rod chamber is communicated with the second primary rod chamber and the second communication oil path.
3. The twin ram cylinder of claim 2 wherein, The core pipe comprises a primary telescopic pipe, a secondary telescopic pipe and a tertiary telescopic pipe, the tertiary telescopic pipe is fixedly arranged in the first secondary piston rod, the secondary telescopic pipe is fixedly arranged in the first primary piston rod, part of the secondary telescopic pipe is slidably arranged in the tertiary telescopic pipe, the primary telescopic pipe is fixedly arranged in the first cylinder barrel, part of the primary telescopic pipe is slidably arranged in the secondary telescopic pipe, the primary telescopic pipe is communicated with the second communication oil path, and the tertiary telescopic pipe is communicated with the second oil port.
4. The twin oil cylinder according to claim 1, characterized by The double oil cylinder comprises a second working oil path, the second working oil path is communicated with the second oil port, a second end of the core pipe and the first rod chamber, the second working oil path comprises a second main working oil path, a second primary working oil path and a second secondary working oil path, the second main working oil path is communicated with the second oil port, the second primary working oil path is communicated with the second main working oil path and the first rod chamber, and the second secondary working oil path is communicated with the second main working oil path and the second end of the core pipe.
5. The twin ram cylinder of claim 4 wherein, The double oil cylinder comprises a first sequence valve group, the first sequence valve group comprises a first overflow valve and a first check valve, the first overflow valve and the first check valve are arranged in parallel on the second primary working oil path, an outlet of the first overflow valve is communicated with the first rod cavity, and an outlet of the first check valve is communicated with the second main working oil path; and / or, The double oil cylinder comprises a second sequence valve group, the second sequence valve group comprises a second overflow valve and a second check valve, the second overflow valve and the second check valve are arranged in parallel on the first communication oil path, an outlet of the second overflow valve is communicated with the second rodless cavity, and an inlet of the first check valve is communicated with the second rodless cavity.
6. The twin ram cylinder of claim 5 wherein, The double oil cylinder comprises a hydraulic control check valve, the hydraulic control check valve is arranged on the first communication oil path between the second sequence valve group and the second rodless cavity, and a control port of the hydraulic control check valve is communicated with the second communication oil path.
7. The twin ram cylinder of claim 6 wherein, The double oil cylinder comprises a first working oil path, the first working oil path is communicated with the first rodless cavity and a first oil port, the double oil cylinder comprises a balance valve, the balance valve is arranged on the first working oil path, the balance valve has a first working port, a second working port and a pilot port, the first working port is communicated with the first oil port, the second working port is communicated with the first rodless cavity, and the pilot port is communicated with the second main working oil path.
8. The twin oil cylinder of claim 1, wherein The telescopic direction of the first telescopic oil cylinder or the second telescopic oil cylinder is a first direction, and the first telescopic oil cylinder and the second telescopic oil cylinder are slidably connected in the first direction.
9. The twin oil cylinder according to claim 8, characterized in that The double oil cylinder comprises a tray, the tray is arranged on the second cylinder barrel, the tray is formed with a guide groove extending in the first direction, a pulley is formed on the first cylinder barrel, and the pulley is matched with the guide groove to slide.
10. A telescopic arm, characterized in that, The double oil cylinder comprises a main arm, a sub-arm and the double oil cylinder of any one of claims 1 to 9, the main arm and the sub-arm are movably connected, and at least one of the main arm and the sub-arm is provided with the double oil cylinder.
11. A work machine characterized by comprising: The telescopic arm comprises the telescopic arm of claim 10.