Hydraulic control system and aerial work platform

Abstract

The application relates to the technical field of aerial work hydraulic technology, in particular to a hydraulic control system and an aerial work truck. The hydraulic control system provided by the application comprises an oil cylinder, a first one-way valve, a second one-way valve, a first oil inlet and a second oil inlet; the oil cylinder comprises a rod cavity and a rodless cavity; the first one-way valve is provided with a first input port and a first output port, the first input port is communicated with the second oil inlet, and the first output port is communicated with the rod cavity; the second one-way valve is provided with a second input port and a second output port, the second input port is communicated between the first output port and the rod cavity, and the second output port is communicated between the first oil inlet and the rodless cavity. The hydraulic oil flow can be regenerated.

Description

Technical Field

[0001] This application relates to the field of hydraulic technology for aerial work, and in particular to a hydraulic control system and an aerial work vehicle. Background Technology

[0002] With the continuous development of aerial work platform technology, the applications of aerial work platforms are becoming increasingly widespread, and higher requirements are being placed on the speed of luffing or telescopic movements during operation. In the telescopic control hydraulic system of boom-type aerial work platforms, in order to enable faster boom extension speed under limited flow and to make the system more energy-efficient, it is necessary to regenerate the hydraulic oil in the circuit to achieve rapid movement control. Utility Model Content

[0003] This application provides a hydraulic control system and an aerial work platform vehicle, which can regenerate hydraulic oil flow.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, embodiments of this application provide a hydraulic control system, including a cylinder, a first check valve, a second check valve, a first oil inlet, and a second oil inlet; the cylinder includes a rod chamber and a rodless chamber; the first check valve has a first input port and a first output port, the first input port being connected to the second oil inlet, and the first output port being connected to the rod chamber; the second check valve has a second input port and a second output port, the second input port being connected between the first output port and the rod chamber, and the second output port being connected between the first oil inlet and the rodless chamber.

[0006] The hydraulic control system proposed in this application allows for the reuse of hydraulic oil when the cylinder needs to extend. Hydraulic oil enters the rodless chamber of the cylinder through the first inlet, pushing the cylinder outwards. Meanwhile, hydraulic oil in the rod chamber flows out to the first check valve, where it is blocked, allowing the oil in the rod chamber to enter the second check valve and then back into the rodless chamber. This achieves flow regeneration. When the cylinder needs to retract, hydraulic oil enters through the second inlet and passes through the first check valve into the rod chamber, causing the cylinder to retract. The retraction of the cylinder forces hydraulic oil out of the rodless chamber, allowing it to flow back to the first inlet. This hydraulic control system is simple in structure and low in cost. It not only regenerates flow but also improves efficiency, making the entire hydraulic oil control system more energy-efficient.

[0007] Optionally, the hydraulic control system further includes a first oil circuit having a first connection port and a second connection port, the first connection port being able to communicate with the second oil inlet port; the second check valve further includes a first pilot port, the first pilot port being connected with the second connection port, the first pilot port being configured to close the second check valve when oil from the second connection port enters the first pilot port.

[0008] In the above embodiment, when the cylinder needs to retract, hydraulic oil enters through the second inlet port, the hydraulic oil enters the first oil circuit, and then enters the first pilot port of the second check valve through the first oil circuit. The hydraulic oil entering the first pilot port will drive the valve core of the second check valve to close, so that the hydraulic oil flowing into the second check valve from the second inlet port cannot enter the rodless chamber.

[0009] Optionally, the hydraulic control system further includes a first balance valve, which has a first port, a second port, and a second pilot port. The first port is connected to the first oil inlet, the second port is connected to the rodless chamber, the second output port is connected between the second port and the rodless chamber, and the second pilot port is connected to the second connecting port.

[0010] In the above embodiment, when the cylinder retracts, one path of hydraulic oil enters the first oil circuit and then the second pilot port; another path of hydraulic oil enters the rod chamber through the first check valve, causing the cylinder to retract. When the cylinder retracts, the hydraulic oil in the rodless chamber is forced out, and the hydraulic oil in the rodless chamber flows out to the second port of the first balance valve. The second balance valve opens under the action of the hydraulic oil in the second port and the second pilot port, thereby allowing the hydraulic oil in the rodless chamber to flow back to the first oil inlet. The synergistic action of the hydraulic oil in the second port and the second pilot port allows the hydraulic oil to flow back to the first oil inlet in a controllable manner, thereby enabling the cylinder to retract in a controllable manner and improving the stability of the hydraulic control system.

[0011] Optionally, the first oil circuit is equipped with a first damping valve.

[0012] In the above embodiment, the first damping valve can reduce the flow rate of hydraulic oil entering the second pilot port of the first balance valve, so that the valve core of the first balance valve opens more smoothly, thereby buffering the opening of the valve core of the first balance valve.

[0013] Optionally, the hydraulic control system further includes a solenoid valve having a main inlet, a main return port, a first port, and a second port. The first port is connected to the first inlet, and the second port is connected to the second inlet. The main inlet is selectively connected to either the first port or the second port, and the main return port is selectively connected to either the first port or the second port.

[0014] Optionally, the hydraulic control system further includes a second oil circuit, the second oil circuit having a third connection port and a fourth connection port, the third connection port being connected between the first output port and the rod chamber, the fourth connection port being connected between the first oil inlet port and the rodless chamber, and the second check valve being disposed in the second oil circuit.

[0015] Secondly, this application also provides an aerial work platform vehicle, including the hydraulic control system described in any of the above embodiments.

[0016] The aerial work platform vehicle of this application includes the hydraulic control system described in any of the above embodiments, and has the beneficial effects of the hydraulic control system described in any of the above embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the hydraulic control system in one embodiment of this application.

[0019] [Explanation of Labels in the Attached Image]

[0020] 1. Hydraulic cylinder; 11. Rodless chamber; 12. Rod chamber; 13. Telescopic rod;

[0021] V1, first oil inlet; V2, second oil inlet;

[0022] 2. First check valve; 21. First inlet port; 22. First outlet port;

[0023] 3. Second check valve; 31. Second inlet port; 32. Second outlet port; 33. First pilot port;

[0024] 4. First oil passage; 41. First connecting port; 42. Second connecting port;

[0025] 5. First balancing valve; 51. First port; 52. Second port; 53. Second pilot port;

[0026] 6. First damping valve;

[0027] 7. Solenoid valve; 71. First oil port; 72. Second oil port;

[0028] 8. Second oil passage; 81. Third connecting port; 82. Fourth connecting port. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0031] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0034] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0035] Firstly, reference Figure 1 This application provides a hydraulic control system, which includes a cylinder 1, a first check valve 2, a second check valve 3, a first inlet V1, and a second inlet V2. The cylinder 1 includes a rod chamber 12 and a rodless chamber 11. The first check valve 2 has a first input port 21 and a first output port 22, the first input port 21 being connected to the second inlet V2, and the first output port 22 being connected to the rod chamber 12. The second check valve 3 has a second input port 31 and a second output port 32, the second input port 31 being connected between the first output port 22 and the rod chamber 12, and the second output port 32 being connected between the first inlet V1 and the rodless chamber 11.

[0036] The hydraulic cylinder 1 has a telescopic rod 13 located in the rod chamber 12. The rodless chamber 11 is connected to the first oil inlet V1, and the rod chamber 12 is connected to the second oil inlet V2 through the first check valve 2. It should be noted that when hydraulic oil flows from the first input port 21 to the first output port 22, the first check valve 2 is open, allowing hydraulic oil to pass through it. When hydraulic oil flows from the first output port 22 to the first input port 21, the first check valve 2 is closed, preventing hydraulic oil from passing through it. When hydraulic oil flows from the second input port 31 to the second output port 32, and the hydraulic pressure overcomes the pressure set in the second check valve 3, causing the valve core in the second check valve 3 to open, the second check valve 3 is open, allowing hydraulic oil to pass through it. When hydraulic oil flows from the second output port 32 to the second input port 31, the second check valve 3 is closed, preventing hydraulic oil from passing through it.

[0037] When the telescopic rod 13 of cylinder 1 needs to extend, hydraulic oil enters through the first inlet V1 and flows into the rodless chamber 11 of cylinder 1. The hydraulic oil in the rodless chamber 11 pushes the telescopic rod 13 to extend, while the hydraulic oil in the rod chamber 12 flows out and is stopped by the first check valve 2. This allows the hydraulic oil in the rod chamber 12 to enter the second check valve 3, and then through the second check valve 3 back into the rodless chamber 11, thus achieving the reuse of hydraulic oil and having a flow regeneration effect. When the telescopic rod 13 of cylinder 1 needs to retract, hydraulic oil enters through the second inlet V2 and flows into the rod chamber 12 through the first check valve 2, causing the telescopic rod 13 in the rod chamber 12 to retract. When the telescopic rod 13 in the rod chamber 12 retracts, it forces out the hydraulic oil in the rodless chamber 11, causing the hydraulic oil in the rodless chamber 11 to flow back to the first inlet V1. The hydraulic control system of this application has a simple structure and low cost. The hydraulic control system can not only achieve flow regeneration but also improve operating efficiency, making the entire hydraulic oil control system more energy-efficient.

[0038] Optionally, the hydraulic control system further includes a first oil circuit 4, which has a first connecting port 41 and a second connecting port 42. The first connecting port 41 can be connected to the second oil inlet V2. The second check valve 3 further includes a first pilot port 33, which is connected to the second connecting port 42. The first pilot port 33 is configured to close the second check valve 3 when oil from the second connecting port 42 enters the first pilot port 33.

[0039] The first pilot port 33 is connected to the second oil inlet V2 through the first oil passage 4. When the telescopic rod 13 of the cylinder 1 needs to retract, hydraulic oil enters the second oil inlet V2. The hydraulic oil in the second oil inlet V2 is divided into two paths. One path of hydraulic oil enters the first oil passage 4 and then enters the first pilot port 33 of the second check valve 3. The hydraulic oil entering the first pilot port 33 will drive the valve core of the second check valve 3 to close, so that the hydraulic oil entering the second check valve 3 from the second oil inlet V2 cannot enter the rodless chamber 11. The other path of hydraulic oil enters the rod chamber 12 through the first check valve 2, causing the telescopic rod 13 in the rod chamber 12 to retract. When the telescopic rod 13 in the rod chamber 12 retracts, it pushes out the hydraulic oil in the rodless chamber 11, so that the hydraulic oil in the rodless chamber 11 flows back to the first oil inlet V1. This allows the hydraulic oil entering from the second oil inlet V2 to act more efficiently on the rod chamber 12, thereby causing the telescopic rod 13 to retract and improving the working efficiency of the hydraulic control system.

[0040] Optionally, the hydraulic control system further includes a first balance valve 5, which has a first port 51, a second port 52, and a second pilot port 53. The first port 51 is connected to the first oil inlet V1, the second port 52 is connected to the rodless chamber 11, the second output port 32 is connected between the second port 52 and the rodless chamber 11, and the second pilot port 53 is connected to the second connecting port 42.

[0041] When the telescopic rod 13 of the hydraulic cylinder 1 extends, oil enters through the first oil inlet V1. The hydraulic oil enters the second port 52 through the first port 51 of the first balance valve 5, and then enters the rodless chamber 11 of the hydraulic cylinder 1. The hydraulic oil in the rodless chamber 11 presses the telescopic rod 13 in the rod chamber 12 to extend. The hydraulic oil in the rod chamber 12 flows out to the first check valve 2 and is cut off, so that the hydraulic oil in the rod chamber 12 enters the second check valve 3, and then enters the rodless chamber 11 through the second check valve 3, thereby realizing the reuse of hydraulic oil and having the effect of flow regeneration.

[0042] When the telescopic rod 13 of cylinder 1 needs to retract, hydraulic oil enters through the second inlet V2. The hydraulic oil in the second inlet V2 is divided into three paths: one path enters the first oil passage 4 and then through the first oil passage 4 to the first pilot port 33 of the second check valve 3. The hydraulic oil entering the first pilot port 33 drives the valve core of the second check valve 3 to close, preventing the hydraulic oil entering the second check valve 3 from the second inlet V2 from entering the rodless chamber 11; another path enters the first oil passage 4 and then through the first oil passage 4 to the second pilot port 53; the third path enters the rod chamber 12 through the first check valve 2, causing the rod to... When the telescopic rod 13 in the rod chamber 12 retracts, it presses out the hydraulic oil in the rodless chamber 11. The hydraulic oil in the rodless chamber 11 flows out to the second port 52 of the first balance valve 5. The second balance valve opens under the action of the hydraulic oil in the second port 52 and the second pilot port 53, so that the hydraulic oil in the rodless chamber 11 flows back to the first oil inlet V1. The hydraulic oil in the second port 52 and the second pilot port 53 work together to make the hydraulic oil flow back to the first oil inlet V1 in a controllable manner, so that the retraction rate of the telescopic rod 13 of the cylinder 1 is controllable, and the stability of the hydraulic control system is improved.

[0043] Optionally, the first oil circuit 4 is equipped with a first damping valve 6. The first damping valve 6 can reduce the flow rate of hydraulic oil entering the second pilot port 53 of the first balance valve 5, so that the valve core of the first balance valve 5 opens more smoothly, thereby buffering the opening of the valve core of the first balance valve 5.

[0044] Optionally, the hydraulic control system further includes a solenoid valve 7. The solenoid valve 7 has a total inlet port, a total return port, a first port 71, and a second port 72. The first port 71 is connected to the first inlet port V1, and the second port 72 is connected to the second inlet port V2. The total inlet port is selectively connected to either the first port 71 or the second port 72, and the total return port is selectively connected to either the first port 71 or the second port 72. The state of the hydraulic cylinder 1 can be controlled by controlling the energized end of the solenoid valve 7 to connect the total inlet port and the total return port to the corresponding first port 71 and second port 72, respectively.

[0045] Optionally, the hydraulic control system further includes a second oil circuit 8, which has a third connecting port 81 and a fourth connecting port 82. The third connecting port 81 connects the first output port 22 and the rod chamber 12, and the fourth connecting port 82 connects the first oil inlet V1 and the rodless chamber 11. A second check valve 3 is provided in the second oil circuit 8. The second input port 31 of the second check valve 3 is connected to the third connecting port 81, and the second output port 32 of the second check valve 3 is connected to the fourth connecting port 82. When the telescopic rod 13 of the cylinder 1 extends, oil enters through the first oil inlet V1. After passing through the first balance valve 5, the hydraulic oil enters the rodless chamber 11. Since the second oil circuit 8 is equipped with the second check valve 3, and the second output port 32 of the second check valve 3 is connected to the fourth connecting port 82, the hydraulic oil flowing out of the first balance valve 5 cannot enter the second oil circuit 8, but can only enter the rodless chamber 11. The hydraulic oil flowing into the rodless chamber 11 pressurizes the extension rod 13 of the rod chamber 12 to extend. At the same time, the hydraulic oil in the rod chamber 12 is forced out. The hydraulic oil flowing out of the rod chamber 12 is cut off when it reaches the first check valve 2 and can only enter the second check valve 3, thus entering the rodless chamber 11, thereby realizing the flow regeneration of the hydraulic control system.

[0046] Secondly, embodiments of this application also provide an aerial work platform vehicle, including the hydraulic control system described in any of the above embodiments. The aerial work platform vehicle of this application, including the hydraulic control system described in any of the above embodiments, has the beneficial effects of the hydraulic control system described in any of the above embodiments.

[0047] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0049] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0050] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hydraulic control system, characterized in that, include: First oil inlet (V1) and second oil inlet (V2); The hydraulic cylinder (1) includes a rod chamber (12) and a rodless chamber (11); The first one-way valve (2) has a first inlet (21) and a first outlet (22), the first inlet (21) being connected to the second oil inlet (V2), and the first outlet (22) being connected to the rod chamber (12); The second check valve (3) has a second input port (31) and a second output port (32). The second input port (31) is connected between the first output port (22) and the rod chamber (12), and the second output port (32) is connected between the first oil inlet (V1) and the rodless chamber (11).

2. The hydraulic control system according to claim 1, characterized in that, It also includes a first oil passage (4), which has a first connecting port (41) and a second connecting port (42), and the first connecting port (41) can be connected to the second oil inlet (V2); The second check valve (3) further includes a first pilot port (33), which is connected to the second communication port (42). The first pilot port (33) is configured to close the second check valve (3) when oil from the second communication port (42) enters the first pilot port (33).

3. The hydraulic control system according to claim 2, characterized in that, It also includes a first balance valve (5), which has a first port (51), a second port (52) and a second pilot port (53). The first port (51) is connected to the first oil inlet (V1), the second port (52) is connected to the rodless chamber (11), the second output port (32) is connected between the second port (52) and the rodless chamber (11), and the second pilot port (53) is connected to the second connecting port (42).

4. The hydraulic control system according to claim 3, characterized in that, The first oil circuit (4) is equipped with a first damping valve (6).

5. The hydraulic control system according to claim 1, characterized in that, It also includes a solenoid valve (7), which has a total oil inlet, a total oil return, a first oil port (71) and a second oil port (72). The first oil port (71) is connected to the first oil inlet (V1), and the second oil port (72) is connected to the second oil inlet (V2). The total oil inlet is selectively connected to either the first oil port (71) or the second oil port (72), and the total oil return is selectively connected to either the first oil port (71) or the second oil port (72).

6. The hydraulic control system according to claim 1, characterized in that, It also includes a second oil passage (8), which has a third connection port (81) and a fourth connection port (82). The third connection port (81) is connected between the first output port (22) and the rod chamber (12), and the fourth connection port (82) is connected between the first oil inlet (V1) and the rodless chamber (11). The second check valve (3) is provided in the second oil passage (8).

7. An aerial work platform vehicle, characterized in that, The hydraulic control system includes any one of claims 1 to 6.

Images