Hydraulic system and working machine

Abstract

This utility model relates to the field of hydraulic technology for engineering machinery, specifically to a hydraulic system and engineering machinery. The hydraulic system has at least a vibration damping mode and an explosion-proof mode. The hydraulic system includes: a lifting cylinder with a hydraulic chamber, adapted to be connected to a boom; an explosion-proof module communicating with the hydraulic chamber; a vibration damping module including a vibration damping valve assembly and an accumulator, both the accumulator and the hydraulic chamber communicating with the vibration damping valve assembly; a first on-off valve communicating with the explosion-proof module, the explosion-proof module being connected between the vibration damping valve assembly and the hydraulic chamber. In vibration damping mode, opening the first on-off valve controls opening the explosion-proof module; in explosion-proof mode, closing the first on-off valve controls closing the explosion-proof module; and / or, a second on-off valve communicating between the vibration damping valve assembly and the hydraulic chamber, the second on-off valve being open in vibration damping mode, and both the second on-off valve and the explosion-proof module being closed in explosion-proof mode. The hydraulic system can switch between vibration damping mode and explosion-proof mode, balancing comfort and safety.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology for engineering machinery, specifically to a hydraulic system and engineering machinery. Background Technology

[0002] Construction machinery typically has a boom, which is raised and lowered using a lifting cylinder. An explosion-proof valve is usually installed on the lifting cylinder. When the pressure in the lifting cylinder is abnormal, such as when a pipeline bursts or the valve core leaks, the one-way valve inside the explosion-proof valve immediately closes the oil circuit, preventing the piston rod of the lifting cylinder from retracting. This prevents the boom from accidentally falling due to pipeline rupture, mechanical fatigue, or operational errors, thus avoiding personal injury, equipment damage, and other problems.

[0003] In addition, as people's requirements for the driving comfort of construction machinery increase, construction machinery will be required to be equipped with stabilization modules. These modules absorb boom vibrations caused by movement, reducing driver bumps during high-speed driving or transportation. This not only improves comfort but also provides advantages such as high steering stability, fast conveying speed, and low mechanical load.

[0004] In engineering machinery related to this technology, the stabilization module needs to interact with the lifting cylinder in real time when it is activated in order to absorb the pressure wave of the lifting cylinder and reduce the overall machine vibration. However, when an explosion-proof valve is installed, it will close the lifting cylinder when there is no lifting or lowering action, preventing the lifting cylinder from interacting with the accumulator in real time, which will cause the stabilization module to fail. The two functions conflict with each other, so usually only one of the explosion-proof valve and the stabilization module can be installed. Utility Model Content

[0005] One objective of this utility model is to provide a hydraulic system to solve the problem of conflicting functions between explosion-proof valves and stabilizing modules in the prior art; the second objective is to provide an engineering machinery.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hydraulic system having at least a vibration damping mode and an explosion-proof mode; the hydraulic system comprising: a lifting cylinder having a hydraulic chamber, the lifting cylinder being adapted to connect to a boom; an explosion-proof module communicating with the hydraulic chamber; a vibration damping module including a vibration damping valve assembly and an accumulator, the accumulator and the hydraulic chamber both communicating with the vibration damping valve assembly; a first on-off valve communicating with the explosion-proof module, the explosion-proof module being connected between the vibration damping valve assembly and the hydraulic chamber, wherein in the vibration damping mode, opening the first on-off valve controls opening the explosion-proof module, and in the explosion-proof mode, closing the first on-off valve controls closing the explosion-proof module; and / or, a second on-off valve communicating between the vibration damping valve assembly and the hydraulic chamber, wherein in the vibration damping mode, the second on-off valve is open, and in the explosion-proof mode, both the second on-off valve and the explosion-proof module are closed.

[0007] According to the above technical means, when the hydraulic system is in normal operating mode, such as when the boom is lifting, lowering, or floating, the explosion-proof module is open and the vibration damping valve group is closed to allow the boom to work normally. In explosion-proof mode, both the explosion-proof module and the vibration damping valve group are closed, preventing the liquid in the hydraulic chamber from flowing out through the explosion-proof module. The hydraulic pressure in the hydraulic chamber remains stable, keeping the boom in its current position and preventing sudden boom drops, thus improving safety. In vibration damping mode, the vibration damping valve group is open. The opening of the first on-off valve controls the opening of the explosion-proof module, or the second on-off valve. The hydraulic chamber is connected to the accumulator through the vibration damping valve group. The accumulator can buffer the hydraulic pressure changes in the hydraulic chamber caused by boom vibration, improving the comfort of the construction machinery. This utility model simultaneously provides an explosion-proof module, a vibration damping module, and a first or second on-off valve. The explosion-proof mode and vibration damping mode can be switched according to actual working conditions, balancing safety and comfort.

[0008] Furthermore, the hydraulic system also includes a working switching valve, which has a first working port and a second working port. The hydraulic chamber includes a rodless chamber and a rod chamber. The explosion-proof module has ports a1 and b1, and the vibration damping valve group has ports a2 and b2. Ports a1, a2, and the first working port are connected. Port b1 is connected to the rodless chamber. The second working port, b2, and the rod chamber are connected. In the vibration damping mode, port a2 is connected to the accumulator. When the hydraulic system includes a first on / off valve, in the vibration damping mode, opening the first on / off valve controls the connection between ports a1 and b1. In the explosion-proof mode, closing the first on / off valve controls the disconnection between ports a1 and b1. When the hydraulic system includes a second on / off valve, the second on / off valve is connected between port a2 and the rodless chamber.

[0009] Based on the above technical means, by switching between the first working port and the second working port for liquid inlet and outlet, the lifting cylinder can be controlled to drive the boom to lift, lower, or float, ensuring the normal functioning of the hydraulic system. In addition, by dividing the hydraulic chamber into a rodless chamber and a rod chamber, the rodless chamber can be controlled to connect with the accumulator, or the explosion-proof module can be controlled to close the rodless chamber, thereby achieving vibration reduction and explosion-proof functions.

[0010] Furthermore, the hydraulic system also includes a pilot valve assembly, which has a first pilot outlet, and the explosion-proof module has a PL port; when the hydraulic system includes a first on / off valve, the oil inlet of the first on / off valve is connected to the first pilot outlet, and the oil outlet of the first on / off valve is connected to the PL port; when the hydraulic system includes a second on / off valve, the pilot valve assembly has a second pilot outlet, which can be connected to or disconnected from the first pilot outlet, and the working switching valve also has a control port, both of which are connected to the second pilot outlet.

[0011] According to the above technical means, when the hydraulic system includes a first on / off valve, the first on / off valve can control the on / off between the first pilot outlet and the PL port to control the opening or closing of the explosion-proof module; when the hydraulic system includes a second on / off valve, the second pilot outlet, the PL port, and the control port are connected, which can synchronously control the switching of the explosion-proof module and the switching of the working mode of the working switching valve, thereby controlling the lifting cylinder to drive the boom to lift, lower, or float.

[0012] Furthermore, the hydraulic system also has a lifting mode and a lowering mode. When the hydraulic system includes a first on / off valve, in the lifting mode or the lowering mode, the first on / off valve is closed, and the a1 port and the b1 port are connected. The hydraulic system also includes a transfer valve. The working switching valve also has a control port. The pilot valve group is provided with a second pilot outlet. The second pilot outlet can be connected to or disconnected from the first pilot outlet. The first oil inlet of the transfer valve is connected to the oil outlet of the first on / off valve. The second oil inlet, the second pilot outlet, and the control port of the transfer valve are connected. The oil outlet of the transfer valve is connected to the PL port.

[0013] According to the above technical means, in explosion-proof mode, the first on-off valve is closed, and the first and second lead-out ports are disconnected, keeping the explosion-proof module closed. In normal working mode, the second lead-out port is connected to the PL port through a transfer valve to control the opening and closing of the explosion-proof module. Combined with the working mode control of the working switching valve by the second lead-out port, the lifting cylinder can drive the boom to lift, lower, or float. In vibration reduction mode, the first and second lead-out ports are disconnected, the first on-off valve is opened, and the first lead-out port is connected to the PL port through the transfer valve to control the opening of the explosion-proof module, causing the hydraulic system to switch to vibration reduction mode.

[0014] Furthermore, the hydraulic system also has a lifting mode and a lowering mode. When the hydraulic system includes a first on-off valve, in the lifting mode, the first on-off valve is closed, and port a1 and port b1 are connected. The oil outlet of the first on-off valve is directly connected to port PL. The pilot valve group is provided with a second pilot outlet, which can be connected to or disconnected from the first pilot outlet. The working switching valve also has a control port, and the second pilot outlet is connected to the control port. The hydraulic system also includes a pressure detection element, which is located on the oil line connecting the second pilot outlet and the control port. In the lowering mode, when the detection value of the pressure detection element is not less than a preset value, the first on-off valve is controlled to open, and port a1 and port b1 are connected. Alternatively, the hydraulic system also includes an electric control handle, which is connected to the first on-off valve. In the lowering mode, the electric control handle controls the first on-off valve to open, and port a1 and port b1 are connected.

[0015] According to the above technical means, in explosion-proof mode, the first on / off valve is closed, and the first and second lead-out ports are disconnected, keeping the explosion-proof module closed. In normal working mode, the second lead-out port controls the working mode of the working switching valve, enabling the lifting cylinder to drive the boom to lift. In conjunction with the pressure detection device or electric control handle, the first on / off valve is opened, enabling the lifting cylinder to drive the boom to lower. In vibration reduction mode, the first and second lead-out ports are disconnected, the first on / off valve is opened, and the first lead-out port is connected to the PL port through the transfer valve to control the opening of the explosion-proof module, switching the hydraulic system to vibration reduction mode.

[0016] Furthermore, the hydraulic system also includes a controller, a vibration damping switch, and a vehicle speed detection device. Both the vibration damping switch and the vehicle speed detection device are connected to the controller. When the hydraulic system includes a first on / off valve, the first on / off valve is communicatively connected to the controller. When the vibration damping switch is open and the vehicle speed detected by the vehicle speed detection device is not lower than a preset vehicle speed, the hydraulic system switches to vibration damping mode, and the controller controls the first on / off valve to open. When the hydraulic system includes a second on / off valve, when the vibration damping switch is open and the detected vehicle speed by the vehicle speed detection device is not lower than a preset vehicle speed, the hydraulic system switches to vibration damping mode, and the second on / off valve opens.

[0017] Based on the above technical means, during the high-speed movement of construction machinery, the hydraulic system will switch to the vibration reduction mode. During the low-speed movement of construction machinery, the boom vibration is less, which has little impact on the driver's driving experience. The hydraulic system remains in the explosion-proof mode, reducing the frequency of mode switching, ensuring working stability, and extending the service life of the vibration reduction module.

[0018] Furthermore, when the hydraulic system includes a second on / off valve, the second on / off valve is a solenoid valve, and the second on / off valve is communicatively connected to the controller. When the vibration damping switch is open and the vehicle speed detected by the vehicle speed detection device is not lower than a preset vehicle speed, the hydraulic system switches to vibration damping mode, and the controller controls the second on / off valve to open. Alternatively, the second on / off valve is a hydraulically controlled valve, and the hydraulic system further includes a fourth on / off valve and a pilot valve assembly. The pilot valve assembly has a first pilot outlet, and the fourth on / off valve is connected to the hydraulically controlled port of the second on / off valve and the first pilot outlet. The fourth on / off valve is communicatively connected to the controller. When the vibration damping switch is open and the vehicle speed detected by the vehicle speed detection device is not lower than a preset vehicle speed, the hydraulic system switches to vibration damping mode, and the controller controls the fourth on / off valve to open.

[0019] Based on the aforementioned technical means, the hydraulic system can be configured in more diverse ways, making it suitable for different scenarios, meeting different usage needs, and expanding the application range of the hydraulic system.

[0020] Furthermore, the hydraulic system also includes an explosion-proof switch, which is communicatively connected to the controller; when the hydraulic system includes a first on / off valve, the explosion-proof switch is activated, the controller controls the first on / off valve to open, and the explosion-proof module is activated; when the hydraulic system includes a second on / off valve, the explosion-proof switch is activated, and the second on / off valve is activated.

[0021] Based on the aforementioned technical means, the driver can manually control whether the explosion-proof mode is turned off, thereby improving safety.

[0022] Furthermore, when the hydraulic system includes a first on / off valve, the first on / off valve and the explosion-proof module are integrated into a single structure; when the hydraulic system includes a second on / off valve, the second on / off valve and the explosion-proof module are integrated into a single structure.

[0023] Based on the above technical means, the number of parts and pipes can be reduced, assembly efficiency can be improved, the connection reliability between the first and second shut-off valves and the explosion-proof module can be improved, and space utilization can be optimized.

[0024] An engineering machine, including the aforementioned hydraulic system.

[0025] Based on the above-mentioned technical means, the engineering machinery of this utility model embodiment, utilizing the above-mentioned hydraulic system, can switch between vibration reduction mode and explosion-proof mode, taking into account both comfort and safety. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in 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 utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is one of the structural schematic diagrams of the hydraulic system in the embodiments of this utility model.

[0028] Figure 2 This is the second schematic diagram of the hydraulic system in this embodiment of the utility model.

[0029] Figure 3 This is the third schematic diagram of the hydraulic system in this embodiment of the utility model.

[0030] Figure 4 This is the fourth schematic diagram of the hydraulic system in this embodiment of the utility model.

[0031] Figure 5 This is the fifth schematic diagram of the hydraulic system in this embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram showing the connection of the fourth shut-off valve, the lifting cylinder, the explosion-proof module, and the second shut-off valve in this embodiment of the present invention.

[0033] Figure 7 This is a schematic diagram showing the connection of the second on / off valve, lifting cylinder, explosion-proof module, and vibration damping module in this embodiment of the present invention.

[0034] Figure 8 This is a structural schematic diagram of the vibration reduction module in an embodiment of this utility model.

[0035] Figure 9 This is a schematic diagram showing the connection of the explosion-proof module, the first channel valve, and the transfer valve in this embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures: 1. Hydraulic system; 2. Liquid storage device; 3. Controller; 100. Lifting cylinder; 110. Hydraulic chamber; 111. Rodless chamber; 112. Rod chamber; 200. Explosion-proof module; 210. Holding valve; 211. First opening; 212. Annular cavity; 213. Spring cavity; 220. Explosion-proof proportional valve; 221. First valve port; 222. Second valve port; 223. Third valve port; 224. Fourth valve port; 225. Left control port; 226. Right control port; 230. Explosion-proof check valve; 240. Explosion-proof overflow valve; 250. Explosion-proof switch; 300. Vibration damping module; 310. Vibration damping valve assembly; 311. Control valve; 312. Vibration damping valve; 313. Check valve; 320. Accumulator; 330. Vibration damping drain valve; 340. Vibration damping relief valve; 400. First on / off valve; 410. Transfer valve; 420. Pressure detection element; 430. Electric control handle; 500. Second on / off valve; 510. Solenoid valve assembly; 600, Pilot valve assembly; 610, Pilot valve; 620, Filter; 630, Third on / off valve; 640, Oil source valve; 650, Pilot accumulator; C, First pilot outlet; B1, Second pilot outlet; 700, Working switching valve; A2, First working port; B2, Second working port; xF, Control port; 800. Vibration damping switch; 810. Vehicle speed detection device; 820. Fourth on / off valve; 900, multi-way valve; 910, rotating bucket switching valve; 920, rotating bucket hydraulic cylinder. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0039] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the modules related to this utility model and are not drawn according to the actual number, shape and size of the modules in the actual implementation. In the actual implementation, the form, quantity and proportion of each module can be arbitrarily changed, and the layout of the modules may also be more complex.

[0040] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.

[0041] This utility model embodiment proposes a hydraulic system 1, which has at least a vibration damping mode and an explosion-proof mode. The hydraulic system 1 includes a lifting cylinder 100, an explosion-proof module 200, a vibration damping module 300, a first on / off valve 400, and / or a second on / off valve 500.

[0042] The lifting cylinder 100 is provided with a hydraulic chamber 110. The lifting cylinder 100 is adapted to be connected to the boom. The explosion-proof module 200 is connected to the hydraulic chamber 110. The vibration damping module 300 includes a vibration damping valve group 310 and an accumulator 320. Both the accumulator 320 and the hydraulic chamber 110 are connected to the vibration damping valve group 310. The first on-off valve 400 is connected to the explosion-proof module 200. The first on-off valve 400 controls the on-off of the explosion-proof module 200. The explosion-proof module 200 is connected between the vibration damping valve group 310 and the hydraulic chamber 110. In the vibration damping mode, the opening of the first on-off valve 400 controls the opening of the explosion-proof module 200. In the explosion-proof mode, the closing of the first on-off valve 400 controls the closing of the explosion-proof module 200.

[0043] The second shut-off valve 500 is connected between the vibration damping valve group 310 and the hydraulic chamber 110. In vibration damping mode, the second shut-off valve 500 is open. In explosion-proof mode, both the explosion-proof module 200 and the second shut-off valve 500 are closed.

[0044] Specifically, when the first on / off valve 400 is set, and the hydraulic system 1 is in vibration reduction mode, the first on / off valve 400 is opened to control the explosion-proof module 200 to open. The hydraulic chamber 110 is connected to the vibration reduction module 300 through the explosion-proof module 200, thus achieving the vibration reduction function. When the hydraulic system 1 is in explosion-proof mode, the first on / off valve 400 is closed to control the explosion-proof module 200 to close. The hydraulic chamber 110 is not connected to the vibration reduction module 300, thus achieving the explosion-proof function.

[0045] With the second shut-off valve 500 in place, the hydraulic system 1 is in vibration reduction mode. The second shut-off valve 500 is open, and the hydraulic chamber 110 is connected to the vibration reduction module 300 through the second shut-off valve 500, thus achieving vibration reduction function. When the hydraulic system 1 is in explosion-proof mode, both the explosion-proof module 200 and the second shut-off valve 500 are closed, and the hydraulic chamber 110 is not connected to the vibration reduction module 300, thus achieving explosion-proof function.

[0046] For example, construction machinery can refer to construction machinery vehicles such as loaders, bulldozers, and excavators.

[0047] It should be noted that the first shut-off valve 400 and the second shut-off valve 500 can be set simultaneously, or only the first shut-off valve 400 can be set, or only the second shut-off valve 500 can be set. The appropriate method can be selected according to the needs of the application scenario.

[0048] In the normal operating mode, the hydraulic system 1 of this utility model can control the inlet and outlet of the hydraulic chamber 110 to drive the boom to perform lifting, lowering, or floating actions by the lifting cylinder 100. In the explosion-proof mode, the explosion-proof module 200, the vibration damping valve group 310, the first on-off valve 400, and the second on-off valve 500 are all kept in the closed state. The liquid in the hydraulic chamber 110 will not flow out through the explosion-proof module 200 or the second on-off valve 500. The hydraulic pressure in the hydraulic chamber 110 remains stable, and the boom remains in the current position, which can prevent the boom from falling suddenly and improve safety. In the vibration damping mode, the vibration damping valve group 310 and the first on-off valve 400 are opened to control the opening of the explosion-proof module 200 or the second on-off valve 500. When the hydraulic chamber 110 is connected to the accumulator 320 through the vibration damping valve group 310, the accumulator 320 can buffer the hydraulic pressure changes in the hydraulic chamber 110 caused by boom shaking, thereby improving the operation and riding comfort of the construction machinery.

[0049] The explosion-proof module 200 and the lifting cylinder 100 can be directly connected, meaning that the explosion-proof module 200 and the lifting cylinder 100 are not connected by pipes. This avoids the explosion-proof module 200 failing to perform its explosion-proof function due to pipe rupture, thereby improving the safety of the hydraulic system 1.

[0050] In summary, in this embodiment of the utility model, both an explosion-proof module 200 and a vibration damping module 300 are provided. The explosion-proof mode and the vibration damping mode can be switched according to the actual working conditions. That is, in the condition of transportation or driving, the hydraulic system 1 is in the vibration damping mode to reduce the bumps of the construction machinery. In the condition of the boom being raised for operation or maintenance, the hydraulic system 1 is in the explosion-proof mode to prevent the boom from falling accidentally and improve safety.

[0051] In some embodiments, when the hydraulic system 1 includes a first on / off valve 400, the first on / off valve 400 is integrated with the explosion-proof module 200 into a single structure; or when the hydraulic system 1 includes a second on / off valve 500, the second on / off valve 500 is integrated with the explosion-proof module 200 into a single structure; or, both the first on / off valve 400 and the second on / off valve 500 are integrated with the explosion-proof module 200 into a single structure.

[0052] This reduces the number of parts and pipes, improves assembly efficiency, enhances the connection reliability between the first shut-off valve 400 and the second shut-off valve 500 and the explosion-proof module 200, and optimizes space utilization.

[0053] Specifically, such as Figures 1-5As shown, the hydraulic system 1 also includes a working switching valve 700, which has a first working port A2 and a second working port B2. The hydraulic chamber 110 includes a rodless chamber 111 and a rod chamber 112. The explosion-proof module 200 is provided with port a1 and port b1. The vibration damping valve group 310 is provided with port a2 and port b2. Ports a1 and a2 are connected to the first working port A2. Port b1 is connected to the rodless chamber 111. Ports B2 and b2 are connected to the rod chamber 112. In the vibration damping mode, port a2 is connected to the accumulator 320.

[0054] Furthermore, the explosion-proof module 200 is installed at the oil port of the rodless cavity 111.

[0055] Hydraulic system 1 also has a lifting mode and a lowering mode. In lifting mode, hydraulic system 1 discharges fluid from the first working port A2, and the fluid flows into the rodless chamber 111 through ports a1 and b1. The fluid in the rod chamber 112 flows into the second working port B2, thereby lifting the boom. In lowering mode, hydraulic system 1 opens the explosion-proof module 200, discharges fluid from the second working port B2, and the fluid flows into the rod chamber 112. The fluid in the rodless chamber 111 flows into the first working port A2 through ports b1 and a1, thereby lowering the boom.

[0056] In this way, by switching between the inlet and outlet of liquid between the first working port A2 and the second working port B2, the lifting cylinder 100 can be controlled to drive the boom to lift, lower, or float, ensuring the normal functioning of the hydraulic system 1. In addition, by dividing the hydraulic chamber 110 into a rodless chamber 111 and a rod chamber 112, the rodless chamber 111 can be connected to the accumulator 320, or the explosion-proof module 200 can be controlled to close the rodless chamber 111, thereby achieving vibration reduction and explosion-proof functions.

[0057] like Figures 1-3 As shown, when the hydraulic system 1 includes the first on / off valve 400, in the vibration damping mode, the opening control port a1 and port b1 of the first on / off valve 400 are connected, and in the explosion-proof mode, the closing control port a1 and port b1 of the first on / off valve 400 are disconnected. In this way, when the hydraulic system 1 is in vibration reduction mode, the first on / off valve 400 is opened, and ports a1 and b1 are connected. At this time, the rodless chamber 111, port b1, port a1, and port a2 are sequentially connected to the accumulator 320. The accumulator 320 can buffer the hydraulic fluctuations in the rodless chamber 111, and the hydraulic pressure in the rod chamber 112 can be balanced through the second working ports B2 and b2, thereby realizing the vibration reduction function of the lifting cylinder 100, reducing the vibration of the construction machinery, and improving comfort. When the hydraulic system 1 is in explosion-proof mode, the first on / off valve 400 is closed, and ports a1 and b1 are disconnected. At this time, the rodless chamber 111 is disconnected from the accumulator 320, and the rodless chamber 111 is sealed by the explosion-proof module 200, which can ensure that the hydraulic pressure in the rodless chamber 111 remains in the current state, thereby maintaining the boom at a constant height and improving safety.

[0058] like Figures 4-5 As shown, when the hydraulic system 1 includes the second on / off valve 500, the second on / off valve 500 is connected between port a2 and rodless chamber 111.

[0059] In this way, when hydraulic system 1 is in vibration damping mode, the second on-off valve 500 is open. At this time, the rodless chamber 111, the second on-off valve 500, port a2 are sequentially connected to the accumulator 320. The accumulator 320 can buffer the hydraulic fluctuations in the rodless chamber 111, and the hydraulic pressure in the rod chamber 112 can be balanced through the second working ports B2 and b2, thereby realizing the vibration damping function of the lifting cylinder 100, reducing boom shaking, and improving comfort. When hydraulic system 1 is in explosion-proof mode, the second on-off valve 500 is closed. At this time, the rodless chamber 111 is disconnected from the accumulator 320, and the explosion-proof module 200 is closed. Ports a1 and b1 are disconnected, and the rodless chamber 111 is sealed by the explosion-proof module 200, which can ensure that the hydraulic pressure in the rodless chamber 111 remains in the current state, keeping the boom at a constant height and improving safety.

[0060] It should be noted that the two methods described above can be implemented simultaneously in one embodiment.

[0061] Furthermore, such as Figure 1 and Figure 2 As shown, the hydraulic system 1 also includes a pilot valve assembly 600, which has a first pilot outlet C, and the explosion-proof module 200 has a PL port.

[0062] When the hydraulic system 1 includes a first on / off valve 400, the oil inlet of the first on / off valve 400 is connected to the first pilot outlet C, and the oil outlet of the first on / off valve 400 is connected to the PL port.

[0063] When the hydraulic system 1 includes the second on / off valve 500, the pilot valve group 600 is provided with a second pilot outlet B1, which can be connected to or disconnected from the first pilot outlet C. The working switching valve 700 also has a control port xF, and both the control port xF and the PL port are connected to the second pilot outlet B1.

[0064] The pilot valve assembly 600 may include a filter 620, an oil source valve 640, and a pilot accumulator 650. The oil source valve 640 is connected to the liquid storage device 2, and the oil source valve 640 is connected to the oil source port of the filter 620 and the pilot accumulator 650. The oil source port of the filter 620 forms a first pilot outlet C. The oil source valve 640 controls whether the filter 620 is supplied with oil and reduces the pressure on the oil supply to the pilot valve assembly 600. The filter 620 can filter out impurities in the liquid and prevent impurities from entering the hydraulic system 1. The pilot accumulator 650 stores energy in the pilot valve assembly 600.

[0065] When the pilot valve assembly 600 is equipped with a second pilot outlet B1, the pilot valve assembly 600 also includes a pilot valve 610 and a third on-off valve 630. The oil inlet of the third on-off valve 630 is connected to the oil outlet of the filter 620, and the oil outlet of the third on-off valve 630 is connected to the oil inlet of the pilot valve 610. The oil outlet of the pilot valve 610 forms the second pilot outlet B1. The third on-off valve 630 can be a solenoid valve. When the third on-off valve 630 is open, the first pilot outlet C and the second pilot outlet B1 are connected. When the third on-off valve 630 is closed, the first pilot outlet C and the second pilot outlet B1 are disconnected. In explosion-proof mode or vibration-damping mode, the boom does not need to be lifted or lowered. At this time, the third on-off valve 630 is closed, the second pilot outlet B1 stops working, and the control port xF will not have hydraulic pressure, preventing the lifting cylinder 100 from operating unexpectedly and improving safety.

[0066] When the hydraulic system 1 includes a first on / off valve 400, the first on / off valve 400 can control the on / off connection between the first pilot outlet C and the PL port to control the opening or closing of the explosion-proof module 200; when the hydraulic system 1 includes a second on / off valve 500, the second pilot outlet B1, the PL port, and the control port xF are connected, which can synchronously control the switching of the explosion-proof module 200 and the switching of the working mode of the working switching valve 700, thereby controlling the lifting cylinder 100 to drive the boom to lift, lower, or float.

[0067] In some embodiments, such as Figure 1 and Figure 9 As shown, when the hydraulic system 1 includes the first on / off valve 400, in the lifting mode or the lowering mode, the first on / off valve 400 is closed, and ports a1 and b1 are connected.

[0068] The hydraulic system 1 also includes a transfer valve 410, a working switching valve 700 with a control port xF, a pilot valve group 600 with a second pilot port B1, the second pilot port B1 being able to connect or disconnect with the first pilot port C, the first oil inlet of the transfer valve 410 being connected with the oil outlet of the first on / off valve 400, the second oil inlet, the second pilot port B1 and the control port xF of the transfer valve 410 being connected, and the oil outlet of the transfer valve 410 being connected with the PL port.

[0069] In explosion-proof mode, the first on / off valve 400 is closed, and the first lead outlet C and the second lead outlet B1 are disconnected, keeping the explosion-proof module 200 closed. In normal operating mode, the second lead outlet B1 is connected to the PL port through the transfer valve 410 to control the opening and closing of the explosion-proof module 200. Combined with the working mode control of the working switching valve 700 by the second lead outlet B1, the lifting cylinder 100 can drive the boom to lift, lower, or float. In vibration reduction mode, the first lead outlet C and the second lead outlet B1 are disconnected, the first on / off valve 400 is opened, and the first lead outlet C is connected to the PL port through the transfer valve 410 to control the opening of the explosion-proof module 200, causing the hydraulic system 1 to switch to vibration reduction mode.

[0070] In other embodiments, such as Figures 2-3 As shown, when the hydraulic system 1 includes the first on / off valve 400, in the lifting mode, the first on / off valve 400 is closed, and ports a1 and b1 are connected.

[0071] The oil outlet of the first on / off valve 400 is directly connected to the PL port. The pilot valve group 600 is provided with a second pilot outlet B1, which can be connected to or disconnected from the first pilot outlet C. The working switching valve 700 also has a control port xF, and the second pilot outlet B1 is connected to the control port xF.

[0072] The hydraulic system 1 also includes a pressure detection element 420, which is located on the oil line connecting the second pilot outlet B1 and the control port xF. In the descent mode, when the detected value of the pressure detection element 420 is not less than a preset value, it controls the first on / off valve 400 to open, connecting ports a1 and b1. Alternatively, the hydraulic system 1 also includes an electric control handle 430, which is connected to the first on / off valve 400. In the descent mode, the electric control handle 430 controls the first on / off valve 400 to open, connecting ports a1 and b1.

[0073] In explosion-proof mode, the first on / off valve 400 is closed, and the first lead-out port C and the second lead-out port B1 are disconnected, keeping the explosion-proof module 200 closed. In normal operation mode, the second lead-out port B1 controls the operation mode of the working switching valve 700, enabling the lifting cylinder 100 to drive the boom to lift. In conjunction with the pressure detection element 420 or the electric control handle 430, the first on / off valve 400 is opened, enabling the lifting cylinder 100 to drive the boom to descend. In vibration reduction mode, the first lead-out port C and the second lead-out port B1 are disconnected, the first on / off valve 400 is opened, and the first lead-out port C is connected to the PL port through the transfer valve 410 to control the opening of the explosion-proof module 200, switching the hydraulic system 1 to vibration reduction mode.

[0074] In this way, the hydraulic system 1 can be constructed in many ways, making it suitable for different application scenarios.

[0075] When the hydraulic system 1 includes an electric control handle 430, the hydraulic system 1 may also include a controller 3 and a solenoid valve assembly 510. The solenoid valve assembly 510 is connected to the control port xF and is used to control the switching of the working mode of the working switching valve 700. The electric control handle 430, the first on / off valve 400, and the solenoid valve assembly 510 are all communicatively connected to the controller 3. The controller 3 controls the on / off of the first on / off valve 400 through the electrical signal from the electric control handle 430, and the controller 3 can also control the on / off of the solenoid valve assembly 510.

[0076] For example, the solenoid valve assembly 510 may include multiple solenoid valves, two of which are a first solenoid valve and a second solenoid valve, and both the first and second solenoid valves are connected to the working switching valve 700. The other two solenoid valves are a third solenoid valve and a fourth solenoid valve, which can be connected to the bucket switching valve 910 on the construction machinery. The first solenoid valve is energized to control the boom lifting, the second solenoid valve is energized to control the boom lowering, the third solenoid valve is energized to control the bucket retraction, and the fourth solenoid valve is energized to control the bucket tipping.

[0077] The boom lifting and lowering are achieved by controlling the work switching valve 700 via the solenoid valve assembly 510. This reduces the number of pipes, simplifies layout, and optimizes space utilization. Furthermore, the pilot valve 610 and the third on / off valve 630 are not required within the pilot valve assembly 600, reducing the number of parts in the pilot valve assembly 600. Additionally, in lowering mode, the explosion-proof module 200 needs to be opened; therefore, an electric control handle 430 is provided. The electric control handle 430 can be located in the cab and directly controlled by the operator to lower the boom.

[0078] In some embodiments, such as Figures 1-5 , Figure 8 As shown, the vibration damping valve assembly 310 has ports a2, b2, T, and X. Port T is suitable for communication with the liquid storage device 2, which can contain liquids such as hydraulic oil. Port X is connected to the accumulator 320. The vibration damping valve assembly 310 has a first state in which port a2 is unidirectionally connected to port X and port b2 and port T are disconnected; a second state in which ports a2, X, b2, and T are not connected to each other; a third state in which ports a2 and X are connected and ports b2 and T are connected; and a fourth state in which ports a2 and b2 are disconnected and ports X and T are connected. When the pressure of accumulator 320 is T1 and the pressure of port a1 is T2, T1-T2=T. When -t≤T≤t, the vibration damping valve group 310 is in the second state; when T≤-t, the vibration damping valve group 310 is in the first state, which can fill the accumulator 320 with liquid; when t≤T, the vibration damping valve group 310 is in the fourth state, and the accumulator 320 is connected to the liquid storage device 2 to release pressure.

[0079] Specifically, the vibration damping valve assembly 310 includes a vibration damping valve 312 and a control valve 311.

[0080] The vibration damping valve 312 is provided with a first oil port, a second oil port, a third oil port, a fourth oil port, a first control oil port, and a second control oil port. The first oil port is connected to port a2, the second oil port is connected to port b2, the third oil port is connected to port X, and the fourth oil port is connected to port T. The inlet of the vibration damping valve 312 is connected to port X, the return oil port of the vibration damping valve 312 is connected to port T, the working oil port of the vibration damping valve 312 is connected to the first control oil port, and the second control oil port is connected to port X. The vibration damping valve 312 has positions 1, 2, 3, and 4. When the vibration damping valve 312 is in position 1, the first oil port and the third oil port... When the oil port is unidirectionally open, the second and fourth oil ports are disconnected, the damping valve 312 is in position 2, the first, second, third, and fourth oil ports are not connected to each other, the damping valve 312 is in position 3, the first and third oil ports are connected, the second and fourth oil ports are connected, the damping valve 312 is in position 4, the first and second oil ports are disconnected, the third and fourth oil ports are connected, the control valve 311 has position 1 where the working oil port and the return oil port are connected and the inlet oil port is closed, and the control valve 311 has position 2 where the inlet oil port and the working oil port are connected and the return oil port is closed.

[0081] When control valve 311 is in position 1 and -t ≤ T ≤ t (i.e., the pressure at port a1 is approximately equal to the pressure of accumulator 320), damping valve 312 is in position 2, and ports a2, b2, T, and X are all disconnected. When control valve 311 is in position 1 and T ≤ -t (i.e., the pressure at port a1 is higher than the pressure of accumulator 320), damping valve 312 is in position 1, and ports X and a2 are connected through check valve 313. Liquid at port a2 flows to port X through check valve 313, filling accumulator 320. When t ≤ T (i.e., the pressure at port a1 is lower than the pressure of accumulator 320), damping valve 312 is in position 4, and ports X and T... When the port is connected, the accumulator 320 is connected to the liquid storage device 2 to release pressure until the pressure at port a1 is close to the pressure of the accumulator 320. The damping valve 312 is then in position 2 again. When the control valve 311 is in position 2, the hydraulic oil of the accumulator 320 enters the first control oil port of the damping valve 312 through the control valve 311, so that the damping valve 312 is in position 3, and the X port and port a2 are connected. The accumulator 320 is connected to the rodless chamber 111 of the lifting cylinder 100 through the damping valve 312. The rod chamber 112 of the lifting cylinder 100 is connected to the liquid storage device 2. The accumulator 320 absorbs the pressure fluctuation of the lifting cylinder 100 and plays a role in shock absorption.

[0082] In this way, in modes other than vibration reduction mode, the pressure of accumulator 320 and the pressure of port a1 are within a certain range, which can both prevent the accumulator 320 from being damaged due to excessive pressure and ensure sufficient pressure inside the accumulator 320, resulting in good vibration reduction effect.

[0083] Furthermore, the control valve 311 is a solenoid valve. When the solenoid valve is not energized, it is in position 1, and when the solenoid valve is energized, it is in position 2.

[0084] In some embodiments, such as Figures 1-5 As shown, the hydraulic system 1 also includes a controller 3, a vibration damping switch 800, and a vehicle speed detection device 810. Both the vibration damping switch 800 and the vehicle speed detection device 810 are communicatively connected to the controller 3.

[0085] When the hydraulic system 1 includes the first on / off valve 400, the controller 3 is connected to the first on / off valve 400. When the damping switch 800 is opened and the vehicle speed of the vehicle speed detection device 810 is not lower than the preset vehicle speed, the hydraulic system 1 switches to the damping mode and the controller 3 controls the first on / off valve 400 to open.

[0086] When the hydraulic system 1 includes the second on / off valve 500, the controller 3 is connected to the second on / off valve 500. When the vibration damping switch 800 is open and the vehicle speed detected by the vehicle speed detection component 810 is not lower than the preset vehicle speed, the hydraulic system 1 switches to the vibration damping mode and the second on / off valve 500 is opened.

[0087] For example, the vibration damping switch 800 can be a manual button. When the vibration damping switch 800 is not activated, the vibration damping valve assembly 310 will not connect regardless of whether the vehicle speed reaches the preset speed. In addition, when the vibration damping switch 800 is activated, the preset vehicle speed is L1. That is, when the vehicle speed is not less than L1, the hydraulic system 1 switches to the vibration damping mode. Furthermore, a vehicle speed L2 is also set. When the hydraulic system 1 is in the vibration damping mode, if the vehicle speed decreases to L2, it switches from the vibration damping mode to the explosion-proof mode. L1 > L2. L1 and L2 can be set according to test experience values ​​and the tonnage of the construction machinery.

[0088] In other words, during high-speed movement of the construction machinery, the hydraulic system 1 switches to vibration reduction mode. During low-speed movement of the construction machinery, the hydraulic system 1 remains in explosion-proof mode. During low-speed movement, the boom vibration is less, which has little impact on the driver's driving experience. In addition, the construction machinery may move at low speed and short distance at the work site, and there is no need to switch to vibration reduction mode. This can reduce the frequency of state switching, ensure work stability, and extend the service life of the vibration reduction module 300.

[0089] The two implementation methods described above can be implemented simultaneously in one embodiment, and they do not necessarily have to be used separately.

[0090] Furthermore, such as Figures 4-7As shown, the second on / off valve 500 is a solenoid valve. The controller 3 is communicatively connected to the second on / off valve 500. When the vibration damping switch 800 is open and the vehicle speed detected by the vehicle speed detection device 810 is not lower than the preset vehicle speed, the hydraulic system 1 switches to the vibration damping mode, and the controller 3 controls the second on / off valve 500 to open. Alternatively, the second on / off valve 500 is a hydraulic control valve. The hydraulic system 1 also includes a fourth on / off valve 820 and a pilot valve group 600. The first pilot outlet C of the pilot valve group 600 is connected between the hydraulic control port of the second on / off valve 500 and the first pilot outlet C. The fourth on / off valve 820 is communicatively connected to the controller 3. When the vibration damping switch 800 is open and the vehicle speed detected by the vehicle speed detection device 810 is not lower than the preset vehicle speed, the hydraulic system 1 switches to the vibration damping mode, and the controller 3 controls the fourth on / off valve 820 to open.

[0091] In this way, the hydraulic system 1 can be configured in a more diverse manner, which is conducive to its application in different scenarios, meeting different usage needs, and expanding the application range of the hydraulic system 1.

[0092] In some embodiments, the hydraulic system 1 further includes an explosion-proof switch 250, which is communicatively connected to the controller 3; when the hydraulic system 1 includes a first on / off valve 400, the explosion-proof switch 250 is turned on, and the controller 3 controls the first on / off valve 400 to open, and the explosion-proof module 200 is turned on; when the hydraulic system 1 includes a second on / off valve 500, the explosion-proof switch 250 is turned on, and the second on / off valve 500 is turned on.

[0093] Among them, the explosion-proof switch 250 can be a manual button. When the explosion-proof switch 250 is not activated, the hydraulic system 1 will not control the opening of the first on / off valve 400 or the second on / off valve 500, keeping the hydraulic system 1 in explosion-proof mode and preventing boom movement.

[0094] In this way, the explosion-proof switch 250 is located in the cab, allowing the driver to manually control whether the explosion-proof mode is turned off, thus improving safety.

[0095] This utility model embodiment proposes an engineering machine, including the aforementioned hydraulic system 1.

[0096] The engineering machinery of this utility model embodiment, utilizing the aforementioned hydraulic system 1, can switch between vibration reduction mode and explosion-proof mode.

[0097] The following describes an embodiment of the engineering machinery of this utility model with reference to the accompanying drawings.

[0098] like Figures 1-5As shown, the construction machinery includes a boom, a bucket, and a hydraulic system 1. The hydraulic system 1 includes a lifting cylinder 100, an explosion-proof module 200, a vibration damping module 300, a pilot valve group 600, a vibration damping switch 800, a bucket cylinder 920, and a multi-way valve 900. The lifting cylinder 100 is connected to the boom, and the bucket cylinder 920 is connected to the bucket. The multi-way valve 900 includes a working switching valve 700 and a bucket switching valve 910. The working switching valve 700 is connected to the lifting cylinder 100 to control the lifting cylinder 100 to drive the boom to rise and fall. The bucket switching valve 910 is connected to the bucket cylinder 920 to control the bucket cylinder 920 to drive the bucket to tilt. The multi-way valve 900 has a first working port A2 and a second working port B2.

[0099] The vibration damping module 300 includes a vibration damping valve group 310 and an accumulator 320. The vibration damping valve group 310 includes a control valve 311, a vibration damping valve 312, a vibration damping drain valve 330, and a vibration damping relief valve 340. The vibration damping drain valve 330 can manually relieve pressure on the accumulator 320, and the vibration damping relief valve 340 prevents the accumulator 320 from being under excessive pressure.

[0100] The explosion-proof module 200 includes a holding valve 210, an explosion-proof proportional valve 220, an explosion-proof check valve 230, and an explosion-proof overflow valve 240. The explosion-proof proportional valve 220 is provided with a first valve port 221, a second valve port 222, a third valve port 223, a fourth valve port 224, a right control port 226, and a left control port 225. The holding valve 210 includes a first opening 211, an annular cavity 212, and a spring cavity 213. The first valve port 221, the second valve port 222, and the first opening 211 are connected to port a1 of the explosion-proof module 200. The annular cavity 212 is connected to the third valve port 223 and port b1. The spring cavity 213 is connected to the fourth valve port 224. The explosion-proof check valve 230 is connected between the right control port 226 and the PL port of the explosion-proof proportional valve 220. The left control port 225 is connected to the DR port. The explosion-proof module 200 is directly assembled into the lifting cylinder 100 so that the rodless chamber 111 is connected to port b1.

[0101] First embodiment: like Figure 1 and Figure 9 The illustration shows a first embodiment. In this first embodiment, the hydraulic system 1 includes a transfer valve 410 and a first on / off valve 400. The first on / off valve 400 is a solenoid valve or similar device. The valve core of the first on / off valve 400 has a position 1 and a position 2. When the valve core is in position 1, the inlet and outlet of the first on / off valve 400 are not connected. When the valve core is in position 2, the inlet and outlet of the first on / off valve 400 are connected. The transfer valve 410 is a shuttle valve. Of course, the transfer valve 410 can also be replaced by a valve with other structures, as long as it can achieve the function of the transfer valve 410.

[0102] When the explosion-proof proportional valve 220 is in position 1, the first valve port 221 is disconnected from the third valve port 223, and the second valve port 222 is disconnected from the fourth valve port 224. At this time, the hydraulic system 1 can be in lifting mode. When the explosion-proof proportional valve 220 is in position 2, the first valve port 221 and the third valve port 223 are connected through a throttle valve. When the explosion-proof proportional valve 220 is in position 3, the first valve port 221 and the third valve port 223 are connected, and the second valve port 222 and the fourth valve port 224 are connected. At this time, the hydraulic system 1 can be in lowering mode. In other words, when the hydraulic system 1 switches from lifting mode to lowering mode, the explosion-proof proportional valve 220 switches from position 1 through position 2 to position 3. Position 2 is used for buffering, controlling the fluid flow rate to gradually change from small to large, avoiding high-pressure fluid impact.

[0103] The pilot valve assembly 600 includes an oil supply valve 640, a pilot accumulator 650, a filter 620, a third on / off valve 630, and a pilot valve 610. The oil supply valve 640 is connected to the filter 620 and the pilot accumulator 650. The oil supply valve 640 reduces the pressure of the oil entering the pilot valve assembly 600, the pilot accumulator 650 stores energy in the pilot valve assembly 600, the filter 620 filters the oil entering the pilot valve 610 to ensure the cleanliness of the pilot valve assembly 600, and the third on / off valve 630 connects or disconnects the oil supply to the pilot valve 610 as needed to prevent accidental operation of the lifting cylinder 100 or the bucket cylinder 920 due to misoperation of the pilot valve 610.

[0104] The explosion-proof module 200 has ports A1 and A2 connected. The explosion-proof module 200 also has ports PL and DR. Port PL is connected to the transfer valve 410. The oil circuit connected to port PL is the control oil circuit for whether ports A1 and B1 are connected. Port DR is connected to the liquid storage device 2. The oil inlet of the first on / off valve 400 is connected to the oil outlet of the filter 620. The oil outlet of the first on / off valve 400 is connected to the first oil inlet of the transfer valve 410. The second oil inlet of the transfer valve 410 is connected to port B1 of the pilot valve 610. When the boom descends, port B1 outputs pressure oil.

[0105] In lifting mode, the first on / off valve 400 must not be electrically powered to position 1, that is, the first on / off valve 400 disconnects the connection between the PL port and the filter 620, there is no pressure oil in the PL port, the explosion-proof proportional valve 220 is in position 1, the A1 port of the pilot valve 610 is connected to the xA port of the multi-way valve 900, the working switching valve 700 is in position 3, the pressure oil in the A2 port enters the a1 port, the holding valve 210 is opened under high pressure, the a1 port is connected to the b1 port through the holding valve 210, and then enters the rodless chamber 111 to realize boom lifting; In descent mode, the first on / off valve 400 must not be electrically powered to position 1, that is, the first on / off valve 400 disconnects the connection between the PL port and the filter 620. The B1 port of the pilot valve 610 is connected to the xF and xB ports of the multi-way valve 900 and the transfer valve 410. The working switching valve 700 is in position 2. The pressure oil at the B1 port enters the PL port through the transfer valve 410, pushing the explosion-proof proportional valve 220 to position 3. The pressure oil at the B2 port enters the rod chamber 112. The oil in the rodless chamber 111 enters the holding valve 210 through the b1 port. The oil in the spring chamber 213 of the holding valve 210 is connected to the a1 port through the explosion-proof proportional valve 220. Part of the oil at the a1 port enters the rod chamber 112 to replenish oil, and the other part flows back to the liquid storage device 2, realizing the boom descent.

[0106] In floating mode, the first on / off valve 400 must not be electrically powered to position 1, that is, the first on / off valve 400 disconnects the connection between the PL port and the filter 620, and the B1 port is connected to the xF and xB of the multi-way valve 900 and the transfer valve 410. The pilot valve 610 moves to the floating position, the output pressure increases, the working switching valve 700 is in position 1, the rod chamber 112 is connected to the liquid storage device 2, the pressure oil of the B1 port enters the PL port through the transfer valve 410, pushing the explosion-proof proportional valve 220 to position 3, the oil in the rodless chamber 111 enters the holding valve 210 through the b1 port, the oil in the spring chamber 213 of the holding valve 210 is connected to the a1 port through the explosion-proof proportional valve 220, part of the oil in the a1 port enters the rod chamber 112 to replenish oil, and the other part flows back to the liquid storage device 2, realizing the boom floating.

[0107] When the bucket tilting, bucket tipping, or lifting cylinders 100 and 920 are not in operation and the vehicle speed is lower than the preset speed, the hydraulic system 1 switches to explosion-proof mode. The first on / off valve 400 and control valve 311 are both disconnected, there is no pressure oil at port PL, the explosion-proof proportional valve 220 is in position 1, the holding valve 210 is closed, and the oil in the rodless chamber 111 of the lifting cylinder 100 is sealed, thereby ensuring that the boom does not fall. In addition, the damping valve 312 is used to keep the pressure at port A2 (equivalent to the pressure at port a1) and the pressure at accumulator 320 within a certain pressure difference range.

[0108] When the lifting cylinder 100 and the bucket cylinder 920 are not in motion, and the vehicle speed is not lower than the preset speed, the hydraulic system 1 switches to the vibration reduction mode. The control valve 311 is energized, causing the valve core to be in position 2. The pressure oil of the accumulator 320 enters the first control port of the vibration reduction valve 312 through the control valve 311. The vibration reduction valve 312 moves to position 3. At the same time, the first on-off valve 400 is energized, causing the valve core to be in position 2. That is, the first on-off valve 400 is opened. The pressure oil of the filter 620 enters the PL port through the first on-off valve 400 and the transfer valve 410, so that the a1 port and the b1 port are connected. The rodless chamber 111 is connected to the accumulator 320, and the rod chamber 112 is connected to the liquid storage device 2. The accumulator 320 absorbs the pressure fluctuation of the rodless chamber 111, which plays a role in vibration reduction.

[0109] When hydraulic system 1 is in vibration reduction mode, when the vehicle speed drops to L2 and the bucket cylinder 920 and lifting cylinder 100 do not move, control valve 311 is de-energized and located at position 1, and the first on-off valve 400 is de-energized and located at position 1, that is, the first on-off valve 400 is disconnected, there is no pressure oil at port PL, and ports a1 and b1 are not connected, and hydraulic system 1 switches to explosion-proof mode.

[0110] In some embodiments, the hydraulic system 1 is equipped with an explosion-proof switch 250, which is connected to the controller 3. The driver can turn on the explosion-proof switch 250 to keep the first on / off valve 400 in the on state, with the PL port constantly connected to oil and the a1 and b1 ports constantly connected, thereby turning off the explosion-proof mode. Turning off the explosion-proof switch 250 will automatically turn the explosion-proof mode on or off according to the above principle.

[0111] Second embodiment: like Figure 2 The example shown is the second embodiment. In the second embodiment, compared with the first embodiment, the hydraulic system 1 eliminates the transfer valve 410, adds a pressure detection element 420, and the first on / off valve 400 is directly connected to the PL port.

[0112] In descent mode, the pressure sensor 420 detects a value greater than or equal to a preset value. The pressure sensor 420 outputs a pressure signal to communicate with the controller 3. The controller 3 controls the first on / off valve 400 to be energized and positioned at position 2. The pilot oil from the filter 620 enters the PL port through the first on / off valve 400, pushing the explosion-proof proportional valve 220 to position 3. The B1 port is connected to the xF and xB ports of the multi-way valve 900. The working switching valve 700 is positioned at position 2. The pressure oil from the B2 port enters the rod chamber 112. The oil in the rodless chamber 111 enters the holding valve 210 through the b1 port. The oil in the spring chamber 213 of the holding valve 210 is connected to the a1 port through the explosion-proof proportional valve 220. Part of the oil in the a1 port enters the rod chamber 112 to replenish the oil, and the other part flows back to the liquid storage device 2, thus realizing the boom descent.

[0113] In floating mode, the pressure detection value of the pressure sensor 420 is greater than or equal to the preset value. The pressure sensor 420 outputs a pressure signal to communicate with the controller 3. The controller 3 controls the first on / off valve 400 to be energized and located at position 2. The pilot oil of the filter 620 enters the PL port through the first on / off valve 400, pushing the explosion-proof proportional valve 220 to move to position 3. The B1 port is connected to the xF port and xB port of the multi-way valve 900. The pilot valve 610 moves to the floating position, the output pressure increases, the working switching valve 700 is located at position 1, the rod chamber 112 is connected to the liquid storage device 2, and the oil in the rodless chamber 111 enters the holding valve 210 through the b1 port. The oil in the spring chamber 213 of the holding valve 210 is connected to the a1 port through the explosion-proof proportional valve 220. Part of the oil in the a1 port enters the rod chamber 112 to replenish the oil, and the other part flows back to the liquid storage device 2, realizing the boom floating.

[0114] When the bucket tilting, bucket retraction, or lifting cylinder 100 and bucket tilting cylinder 920 are not activated, and the vehicle speed is lower than the preset speed, the pressure detection element 420 has no signal output, the first on / off valve 400 is disconnected, there is no pressure oil at the PL port, the explosion-proof proportional valve 220 is in position 1, the holding valve 210 is in the closed state, and the lifting cylinder 100 is sealed, thereby ensuring that the boom does not fall.

[0115] In the second embodiment, the lifting mode of the hydraulic system 1 is the same as that of the hydraulic system 1 in the first embodiment. In addition, the switching between the explosion-proof mode and the vibration reduction mode of the hydraulic system 1 in the second embodiment is also the same as that of the hydraulic system 1 in the first embodiment. In the second embodiment, the hydraulic system 1 may also be equipped with an explosion-proof switch 250. The usage of the explosion-proof switch 250 is the same as that in the first embodiment, and will not be described in detail here.

[0116] Third embodiment: like Figure 3 The illustration shows the third embodiment. In this third embodiment, compared to the first embodiment, the transfer valve 410 is omitted, and an electric control handle 430 and a solenoid valve assembly 510 are added. The pilot valve 610 is omitted from the pilot valve assembly 600. The solenoid valve assembly 510 is connected between the control port xF of the third on / off valve 630 and the working switching valve 700. The solenoid valve assembly 510 controls the on / off connection between the pilot oil source and the two control ports xF of the working switching valve 700 and the two control ports xF of the bucket switching valve 910. The control signal of the first on / off valve 400 is the electrical signal of the lowering action of the electric control handle 430 and the vehicle speed value.

[0117] In lifting mode, the first on / off valve 400 is not energized to position the valve core in position 1, that is, the first on / off valve 400 disconnects the connection between the PL port and the filter 620, there is no pressure oil in the PL port, the explosion-proof proportional valve 220 is in position 1, the electric control handle 430 is operated, the controller 3 sends an electrical signal to the solenoid valve group 510, the pilot oil of the pilot valve group 600 enters the working switching valve 700 through the solenoid valve group 510 to position the valve core in position 3, the pressure oil in port A2 enters port a1, the holding valve 210 is opened under high pressure, port a1 is connected to port b1 through the holding valve 210, and then enters the rodless chamber 111 to realize boom lifting.

[0118] In descent mode, the electric control handle 430 is operated, which sends an electrical signal to the controller 3. The controller 3 energizes the first on / off valve 400, causing the valve core to be in position 2. The pilot oil from the filter 620 enters the PL port through the first on / off valve 400, pushing the valve core of the explosion-proof proportional valve 220 to position 3. The controller 3 sends a signal to the solenoid valve group 510, and the pilot oil from the pilot valve group 600 enters the working switching valve 700 through the solenoid valve group 510, causing the valve core to be in position 2. The pressure oil at port B2 enters the rod chamber 112, and the oil in the rodless chamber 111 enters the holding valve 210 through port b1. The oil in the spring chamber 213 of the holding valve 210 enters the a1 port through position 3 of the explosion-proof proportional valve 220. Part of the oil in the rodless chamber 111 enters the rod chamber 112 to replenish the oil, and the other part flows back to the liquid storage device 2, thus realizing the lowering of the boom.

[0119] In floating mode, the electric control handle 430 sends an electrical signal to the controller 3, which energizes the first on / off valve 400 to position the valve core at position 2. The pilot oil from the filter 620 enters the PL port through the first on / off valve 400, pushing the valve core of the explosion-proof proportional valve 220 to position 3. The controller 3 sends a signal to the solenoid valve group 510, and the pilot oil from the pilot valve group 600 enters the working switching valve 700 to position the valve core at position 3. The rod chamber 112 is connected to the liquid storage device 2, and the oil in the rodless chamber 111 enters the holding valve 210 through port b1. The oil in the spring chamber 213 of the holding valve 210 is connected to port a1 through position 3 of the explosion-proof proportional valve 220. Part of the oil in the rodless chamber 111 enters the rod chamber 112 to replenish the oil, and the other part flows back to the liquid storage device 2, realizing boom floating.

[0120] In the third embodiment, the switching between the explosion-proof mode and the vibration reduction mode of the hydraulic system 1 is the same as that of the hydraulic system 1 in the first embodiment. In the third embodiment, the hydraulic system 1 may also be equipped with an explosion-proof switch 250. The usage of the explosion-proof switch 250 is the same as that in the first embodiment, and will not be described in detail here.

[0121] Fourth embodiment: like Figure 4The example shown is the fourth embodiment. In the fourth embodiment, compared with the first embodiment, the first on / off valve 400 and the transfer valve 410 are removed, and a second on / off valve 500 is added. Port B1 is directly connected to port PL.

[0122] When the lifting cylinder 100 and the bucket cylinder 920 are not in motion, and the vehicle speed reaches L1, the hydraulic system 1 switches to the vibration reduction mode. The control valve 311 is energized and located at position 2. The pressure oil of the accumulator 320 enters the vibration reduction valve 312 through the control valve 311. The vibration reduction valve 312 is located at position 3. At the same time, the second on / off valve 500 is energized and located at position 2. The rodless chamber 111 is connected to the accumulator 320, and the rod chamber 112 is connected to the liquid storage device 2. The accumulator 320 absorbs the pressure fluctuation of the rodless chamber 111, thereby playing a vibration reduction role.

[0123] When the hydraulic system 1 is in vibration reduction mode, when the vehicle speed drops to the L2 value and the lifting cylinder 100 and the bucket cylinder 920 do not move, the control valve 311 is de-energized and located in position 1, the second on-off valve 500 is de-energized and located in position 1, the second on-off valve 500 is closed, the vibration reduction mode is turned off, and the explosion-proof mode is turned on.

[0124] In the fourth embodiment, the lifting mode, lowering mode and floating mode of the hydraulic system 1 are almost the same as those in the first embodiment. In the fourth embodiment, the hydraulic system 1 may also be equipped with an explosion-proof switch 250. The use of the explosion-proof switch 250 is the same as in the first embodiment, and will not be described in detail here.

[0125] Fifth embodiment: like Figure 5 The embodiment shown is the fifth embodiment. In the fifth embodiment, compared with the fourth embodiment, the second on-off valve 500 is replaced with a hydraulic control valve, and a fourth on-off valve 820 is added. The fourth on-off valve 820 is located between the filter 620 and the second on-off valve 500.

[0126] When the lifting cylinder 100 and the bucket cylinder 920 are not in motion, and the vehicle speed reaches L1, the hydraulic system 1 switches to the vibration reduction mode. The control valve 311 is energized and located at position 2. The pressure oil of the accumulator 320 enters the vibration reduction valve 312 through the control valve 311. The vibration reduction valve 312 is located at position 3. The fourth on-off valve 820 is energized and connected. The pressure oil of the filter 620 flows to the second on-off valve 500 to open the second on-off valve 500. The rodless chamber 111 is connected to the accumulator 320, and the rod chamber 112 is connected to the liquid storage device 2. The accumulator 320 absorbs the pressure fluctuation of the rodless chamber 111, thereby playing a vibration reduction role.

[0127] When the hydraulic system 1 is in vibration reduction mode, when the vehicle speed drops to the L2 value and the lifting cylinder 100 and the bucket cylinder 920 do not move, the control valve 311 is de-energized and located in position 1, the fourth shut-off valve 820 is de-energized and disconnected, the control valve 311 and the second shut-off valve 500 are disconnected, the vibration reduction mode is closed, and the explosion-proof mode is activated.

[0128] In the fifth embodiment, the lifting mode, lowering mode and floating mode of the hydraulic system 1 are almost the same as those of the hydraulic system 1 in the fourth embodiment. In the fifth embodiment, the hydraulic system 1 may also be equipped with an explosion-proof switch 250. The use of the explosion-proof switch 250 is the same as that in the first embodiment, and will not be described in detail here.

[0129] Those skilled in the art will understand that the hydraulic system 1 of this utility model is not limited to the above-described embodiments, and other structures can also be used to achieve the above-described functions. The scope of protection of this utility model is described in the technical solution.

[0130] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

[0131] Although embodiments of the present invention 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 the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hydraulic system, characterized in that, The hydraulic system (1) has at least a vibration reduction mode and an explosion-proof mode, and the hydraulic system (1) includes: The lifting cylinder (100) is provided with a hydraulic chamber (110), and the lifting cylinder (100) is adapted to be connected to the boom; An explosion-proof module (200) is connected to the hydraulic chamber (110); The vibration damping module (300) includes a vibration damping valve assembly (310) and an accumulator (320), wherein the accumulator (320) and the hydraulic chamber (110) are both connected to the vibration damping valve assembly (310); A first on / off valve (400) is connected to the explosion-proof module (200), which is connected between the vibration damping valve assembly (310) and the hydraulic chamber (110). In the vibration damping mode, opening the first on / off valve (400) controls the opening of the explosion-proof module (200), and closing the first on / off valve (400) controls the closing of the explosion-proof module (200); and / or, The second on / off valve (500) is connected between the vibration damping valve group (310) and the hydraulic chamber (110). In the vibration damping mode, the second on / off valve (500) is open. In the explosion-proof mode, both the second on / off valve (500) and the explosion-proof module (200) are closed.

2. The hydraulic system according to claim 1, characterized in that, The hydraulic system (1) further includes a working switching valve (700), which has a first working port (A2) and a second working port (B2). The hydraulic chamber (110) includes a rodless chamber (111) and a rod chamber (112). The explosion-proof module (200) is provided with port a1 and port b1. The vibration damping valve group (310) is provided with port a2 and port b2. Port a1, port a2 and the first working port (A2) are connected. Port b1 is connected to the rodless chamber (111). The second working port (B2), port b2 and the rod chamber (112) are connected. In the vibration damping mode, port a2 is connected to the accumulator (320). When the hydraulic system (1) includes a first on / off valve (400), in the vibration reduction mode, the opening of the first on / off valve (400) controls the connection between port a1 and port b1, and in the explosion-proof mode, the closing of the first on / off valve (400) controls the disconnection between port a1 and port b1. When the hydraulic system (1) includes a second on / off valve (500), the second on / off valve (500) is connected between the a2 port and the rodless chamber (111).

3. The hydraulic system according to claim 2, characterized in that, The hydraulic system (1) also includes a pilot valve assembly (600), the pilot valve assembly (600) is provided with a first pilot port (C), and the explosion-proof module (200) is provided with a PL port; When the hydraulic system (1) includes a first on / off valve (400), the oil inlet of the first on / off valve (400) is connected to the first outlet (C), and the oil outlet of the first on / off valve (400) is connected to the PL port. When the hydraulic system (1) includes a second on / off valve (500), the pilot valve group (600) is provided with a second pilot outlet (B1), which can be connected to or disconnected from the first pilot outlet (C). The working switching valve (700) also has a control port (xF), and both the control port (xF) and the PL port are connected to the second pilot outlet (B1).

4. The hydraulic system according to claim 3, characterized in that, The hydraulic system (1) also has a lifting mode and a lowering mode. When the hydraulic system (1) includes a first on / off valve (400), in the lifting mode or the lowering mode, the first on / off valve (400) is closed, and the a1 port and the b1 port are connected. The hydraulic system (1) further includes a transfer valve (410), the working switching valve (700) also has a control port (xF), the pilot valve group (600) is provided with a second pilot port (B1), the second pilot port (B1) can be connected or disconnected from the first pilot port (C), the first oil inlet of the transfer valve (410) is connected to the oil outlet of the first on / off valve (400), the second oil inlet of the transfer valve (410), the second pilot port (B1) and the control port (xF) are connected, and the oil outlet of the transfer valve (410) is connected to the PL port.

5. The hydraulic system (1) according to claim 3, characterized in that, The hydraulic system (1) also has a lifting mode and a lowering mode. When the hydraulic system (1) includes a first on / off valve (400), in the lifting mode, the first on / off valve (400) is closed, and the a1 port and the b1 port are connected. The oil outlet of the first on / off valve (400) is directly connected to the PL port. The pilot valve group (600) is provided with a second pilot outlet (B1). The second pilot outlet (B1) can be connected to or disconnected from the first pilot outlet (C). The working switching valve (700) also has a control port (xF). The second pilot outlet (B1) is connected to the control port (xF). The hydraulic system (1) further includes a pressure detection element (420), which is located on the oil line connecting the second lead outlet (B1) and the control port (xF). In the descent mode, when the detection value of the pressure detection element (420) is not less than a preset value, the first on / off valve (400) is controlled to open, and the a1 port and the b1 port are connected. Alternatively, the hydraulic system (1) may further include an electric control handle (430) connected to the first on / off valve (400). In the descent mode, the electric control handle (430) controls the first on / off valve (400) to open, and the a1 port and the b1 port are connected.

6. The hydraulic system according to any one of claims 1-5, characterized in that, The hydraulic system (1) also includes a controller (3), a vibration damping switch (800), and a vehicle speed detection device (810), both of which are connected to the controller (3); When the hydraulic system (1) includes a first on / off valve (400), the first on / off valve (400) is communicatively connected to the controller (3). When the vibration damping switch (800) is open and the vehicle speed of the vehicle speed detection device (810) is not lower than the preset vehicle speed, the hydraulic system (1) switches to the vibration damping mode, and the controller (3) controls the first on / off valve (400) to open. When the hydraulic system (1) includes the second on / off valve (500), when the damping switch (800) is open and the vehicle speed detected by the vehicle speed detection device (810) is not lower than the preset vehicle speed, the hydraulic system (1) switches to the damping mode and the second on / off valve (500) opens.

7. The hydraulic system according to claim 6, characterized in that, When the hydraulic system (1) includes a second on / off valve (500), the second on / off valve (500) is a solenoid valve. The second on / off valve (500) is connected to the controller (3) in communication. When the damping switch (800) is open and the vehicle speed detected by the vehicle speed detection device (810) is not lower than the preset vehicle speed, the hydraulic system (1) switches to the damping mode, and the controller (3) controls the second on / off valve (500) to open. Alternatively, the second on / off valve (500) is a hydraulic control valve, and the hydraulic system (1) further includes a fourth on / off valve (820) and a pilot valve group (600). The pilot valve group (600) is provided with a first pilot outlet (C). The fourth on / off valve (820) is connected to the hydraulic control port of the second on / off valve (500) and the first pilot outlet (C). The fourth on / off valve (820) is communicatively connected to the controller (3). When the vibration damping switch (800) is opened and the vehicle speed detected by the vehicle speed detection device (810) is not lower than the preset vehicle speed, the hydraulic system (1) switches to the vibration damping mode, and the controller (3) controls the fourth on / off valve (820) to open.

8. The hydraulic system according to claim 6, characterized in that, The hydraulic system (1) also includes an explosion-proof switch (250), which is communicatively connected to the controller (3); When the hydraulic system (1) includes the first on / off valve (400), the explosion-proof switch (250) is turned on, the controller (3) controls the first on / off valve (400) to open, and the explosion-proof module (200) is turned on; When the hydraulic system (1) includes the second on / off valve (500), the explosion-proof switch (250) is turned on, and the second on / off valve (500) is opened.

9. The hydraulic system according to any one of claims 1-5, characterized in that, When the hydraulic system (1) includes a first on / off valve (400), the first on / off valve (400) and the explosion-proof module (200) are integrated into a single structure; When the hydraulic system (1) includes a second on / off valve (500), the second on / off valve (500) and the explosion-proof module (200) are integrated into a single structure.

10. An engineering machinery, characterized in that, Includes the hydraulic system (1) as described in any one of claims 1-9.

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