Suspension cab hydraulic system capable of being actively adjusted

Abstract

The invention provides a suspension cab hydraulic system capable of being actively adjusted, which comprises an ascending electromagnetic valve, a descending electromagnetic valve, a control oil way and a suspension device, a main oil supply way is arranged at an inlet of the ascending electromagnetic valve, and a main oil return way is arranged at an outlet of the descending electromagnetic valve; an outlet of the ascending electromagnetic valve and an inlet of the descending electromagnetic valve are both connected with a control oil way; and the control oil path is connected with a pressure oil port of the suspension device. According to the invention, through the ascending solenoid valve and the descending solenoid valve, the control oil path can be switched to a locking state, an oil supply state or an oil return state; the suspension device can be controlled to suspend, ascend and descend, the suspension height of the cab is actively controlled, and the cab can adapt to various working conditions conveniently. Furthermore, the suspension device comprises a suspension oil cylinder, a suspension electromagnetic valve and an energy accumulator, and the energy accumulator is connected with a pressure oil port of the suspension electromagnetic valve. And the first working interface and the second working interface of the suspension electromagnetic valve are connected with the large cavity and the small cavity of the suspension oil cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor suspended cabs, and particularly to an actively adjustable hydraulic system for a suspended cab. Background Art

[0002] When traditional tractors are working, especially when operating on uneven or rough ground, the cab will be significantly affected by vibrations and impacts. This not only increases the operating fatigue of the driver, but also has an adverse impact on occupational health when working under such high-intensity impacts for a long time. In order to reduce the adverse effects of cab vibrations and impacts on operating comfort and health, suspended cab technology has been introduced into tractor design.

[0003] Currently, suspended cabs usually adopt mechanical or air spring suspension systems to absorb vibrations and impact forces from the chassis. With this mechanical structure, although the vibration amplitude felt in the cab can be reduced to a certain extent and the driver's comfort can be improved, the suspended height of the cab cannot be actively controlled, and it cannot adapt to various working conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to actively control the suspended height of the cab.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: The present invention provides an actively adjustable hydraulic system for a suspended cab, including a rising solenoid valve, a falling solenoid valve, a control oil circuit, and a suspension device. The inlet of the rising solenoid valve is provided with a main oil supply circuit, the outlet of the falling solenoid valve is provided with a main oil return circuit, and the outlet of the rising solenoid valve and the inlet of the falling solenoid valve are both connected to the control oil circuit; the control oil circuit is connected to the pressure oil port of the suspension device.

[0006] The beneficial effects of the present invention are: By adopting the present invention, the control oil circuit can be respectively switched to a locked state, an oil supply state, or an oil return state through the rising solenoid valve and the falling solenoid valve; when the control oil circuit is in the locked state, the suspension device works normally in suspension; when the control oil circuit is in the oil supply state, the suspension device rises; when the control oil circuit is in the oil return state, the suspension device descends; thus, the suspension, rising, and descending of the suspension device can be controlled, realizing the active control of the suspended height of the cab and facilitating adaptation to various working conditions.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Further, the suspension device includes a suspension oil cylinder, a suspension solenoid valve, and an accumulator. One end of the suspension solenoid valve is provided with a pressure oil port, and the accumulator and the control oil circuit are both connected to the pressure oil port of the suspension solenoid valve. The other end of the suspension solenoid valve is provided with a first working interface and a second working interface. The first working interface of the suspension solenoid valve is connected to the large chamber of the suspension oil cylinder, and the second working interface of the suspension oil cylinder is connected to the small chamber of the suspension oil cylinder. When the suspension solenoid valve is opened, both the first working interface and the second working interface of the suspension solenoid valve are communicated with the pressure oil port.

[0009] The oil in the control oil circuit can provide the same pressure for controlling the large chamber and the small chamber of the suspension oil cylinder through the pressure oil port. The pressure difference generated by the difference in the cross-sectional areas of the oil in the large chamber and the small chamber is used to push the piston rod of the suspension oil cylinder to move, thereby controlling the expansion and contraction of the suspension oil cylinder and realizing the active control of the suspension height of the cab. The control efficiency is high, the impact caused by the too-fast expansion and contraction of the suspension oil cylinder is avoided, and the service life of components such as the suspension solenoid valve is prolonged. When the control oil circuit stops supplying oil and returning oil, that is, when it is in the locked state, the pressure difference gradually reaches equilibrium with the load borne by the piston rod of the suspension oil cylinder, ensuring that the suspension oil cylinder remains suspended near the working height. Thus, only one accumulator is needed to maintain the working height of the suspension oil cylinder, and there is no need to separately arrange accumulators at both ends of the suspension oil cylinder, saving the number of accumulators and reducing the device cost. In addition, when the chassis is impacted and the load of the suspension oil cylinder fluctuates, the oil in the large chamber of the suspension oil cylinder flows into the small chamber and the accumulator (or the oil in the small chamber and the accumulator of the suspension oil cylinder flows into the large chamber) simultaneously through the suspension solenoid valve, realizing the absorption of impact energy. At the same time, by adjusting the opening degree of the suspension solenoid valve, the oil flow damping can be adjusted, thereby changing the hardness of the suspension device, being able to adapt to different terrain conditions and operation requirements, and improving the shock absorption effect and comfort.

[0010] Further, the suspension device further includes a raise one-way valve and a lower one-way valve. The inlets of the raise one-way valve and the lower one-way valve are both connected to the pressure oil port of the suspension solenoid valve. The outlet of the raise one-way valve is connected to the first working interface of the suspension solenoid valve, and the outlet of the lower one-way valve is connected to the second working interface of the suspension oil cylinder.

[0011] When the control oil circuit is in the oil supply state, the oil in the control oil circuit passes through the raise one-way valve and the lower one-way valve, thereby providing the same pressure for controlling the large chamber and the small chamber of the suspension oil cylinder, facilitating the quick control of the suspension oil cylinder to rise without changing the working state of the suspension solenoid valve, with high control efficiency and good working stability.

[0012] Further, the suspension device further includes a control unit and a displacement sensor capable of monitoring the extension amount of the suspension oil cylinder. The displacement sensor, the raise solenoid valve, and the lower solenoid valve are respectively connected to the control unit through signals. The control unit is capable of receiving a preset extension amount input manually. The control unit controls the opening and closing of the up solenoid valve and the down solenoid valve according to the displacement signal of the displacement sensor and the preset extension amount.

[0013] An automatic control mode is realized. In the automatic control mode, the extension amount of the suspension cylinder is monitored by the displacement sensor, and the control unit controls the opening and closing of the up solenoid valve and the down solenoid valve, which is convenient for controlling the extension amount of the suspension cylinder within the preset extension amount range and improves the reliability.

[0014] Further, the control unit controls the opening and closing of the up solenoid valve and the down solenoid valve according to the displacement signal of the displacement sensor and the preset extension amount, including: The control unit compares the displacement signal with the preset extension amount. When the displacement signal is within the preset extension amount range, the control unit controls the up solenoid valve to close and the down solenoid valve to close; when the displacement signal is lower than the preset extension amount range, the control unit controls the up solenoid valve to open and the down solenoid valve to close; when the displacement signal is higher than the preset extension amount range, the control unit controls the up solenoid valve to close and the down solenoid valve to open.

[0015] It is convenient to realize the automatic control mode, and the operator can set the preset extension amount according to his own feeling, so as to actively adjust the height of the suspended cab and improve the operation comfort.

[0016] Further, at least two suspension devices are provided, the number of control oil circuits is the same as the number of suspension devices, and each control oil circuit is correspondingly connected to the pressure oil port of the suspension device; the outlets of the up solenoid valve are respectively connected to each control oil circuit through branches; the inlets of the down solenoid valve are connected to each control oil circuit through shunts.

[0017] It is convenient to control multiple suspension devices at the same time. Through multiple suspension devices, they can be installed on the left and right sides of the tractor cab and other necessary positions to realize the suspension needs of multiple positions of the cab and the absorption of impact energy, and the adaptability is strong.

[0018] Further, a first one-way valve is also provided on the branch from the outlet of the up solenoid valve to the control oil circuit. The first one-way valve can supply hydraulic oil to flow unidirectionally from the up solenoid valve to the control oil circuit; the outlet of the up solenoid valve is also connected to a feedback oil circuit, and the feedback oil circuit is used to connect to the feedback oil port of the load-sensing pump; the total supply oil circuit is used to connect to the outlet of the load-sensing pump; a return oil port is also provided on the up solenoid valve, and the return oil port of the up solenoid valve is connected to the total return oil circuit.

[0019] It avoids the leakage of the oil fluid of the suspension device through the up solenoid valve, improving the reliability; through the feedback oil circuit, the outlet pressure of the up solenoid valve is fed back to the load sensing pump, and the load sensing pump supplies oil to the up solenoid valve. When the up solenoid valve is closed, the oil pressure at its outlet and the feedback oil circuit returns oil through the oil return port, enabling the load sensing pump to promptly stop the high-power output, avoiding energy waste and reducing energy consumption.

[0020] Further, a first throttle valve is also provided at the outlet of the up solenoid valve; the feedback oil circuit is connected between the outlet of the up solenoid valve and the first throttle valve.

[0021] Through the first throttle valve, it is convenient to slow down the extending speed of the suspension cylinder and reduce the impact; at the same time, it avoids affecting the response speed of the feedback oil circuit.

[0022] Further, a second one-way valve is also provided on the branch road from the inlet of the down solenoid valve to the control oil circuit, and the second one-way valve can supply oil to flow unidirectionally from the control oil circuit to the down solenoid valve.

[0023] Further, a second throttle valve is also provided on the total oil supply road; a third throttle valve is also provided on the total oil return road.

[0024] Through the second throttle valve, it is convenient to control the pressure difference between the feedback oil circuit and the inlet of the total oil supply road; through the third throttle valve, it is convenient to slow down the retracting speed of the suspension cylinder and reduce the impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the suspension device of the present invention in the up state.

[0027] Figure 3 It is a schematic structural diagram of the suspension device of the present invention in the down state.

[0028] In the drawings, the technical features represented by the respective reference numerals are as follows: 1 - up solenoid valve; 2 - down solenoid valve; 3 - control oil circuit; 4 - suspension device; 41 - suspension cylinder; 42 - suspension solenoid valve; 43 - accumulator; 44 - lift one-way valve; 45 - lower one-way valve; 46 - displacement sensor; 5 - total oil supply road; 6 - total oil return road; 7 - first one-way valve; 8 - feedback oil circuit; 9 - first throttle valve; 10 - second throttle valve; 11 - third throttle valve; 12 - second one-way valve. DETAILED DESCRIPTION OF THE INVENTION

[0029] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0030] Refer to the present invention Figures 1-3 .

[0031] The present invention provides an actively adjustable hydraulic system for a suspended cab, including a rising solenoid valve 1, a falling solenoid valve 2, a control oil circuit 3, and a suspension device 4. The inlet of the rising solenoid valve 1 is provided with a main oil supply circuit 5, and the outlet of the falling solenoid valve 2 is provided with a main oil return circuit 6. The outlet of the rising solenoid valve 1 and the inlet of the falling solenoid valve 2 are both connected to the control oil circuit 3; the control oil circuit 3 is connected to the pressure oil port of the suspension device 4.

[0032] Principle: During installation, the main oil supply circuit 5 can be used to connect to a hydraulic pump to facilitate the supply of pressure oil to the hydraulic system; the main oil return circuit 6 can be used to connect to a fuel tank.

[0033] The suspended state is as Figure 1 shown: the rising solenoid valve 1 is closed, the falling solenoid valve 2 is closed, and the control oil circuit 3 and the suspension device 4 are in a locked state; the suspension device 4 remains near the original suspended height and can absorb vibrations and impact forces from the chassis for floating.

[0034] The rising state is as Figure 2 shown: the rising solenoid valve 1 is opened, the falling solenoid valve 2 is closed, and the control oil circuit 3 is in an oil supply state; the rising solenoid valve 1 supplies oil to the control oil circuit 3, and the oil in the control oil circuit 3 enters the suspension device 4, thereby pushing the suspension device 4 to rise.

[0035] The falling state is as Figure 3 shown: the rising solenoid valve 1 is closed, the falling solenoid valve 2 is opened, and the control oil circuit 3 is in an oil return state; the rising solenoid valve 1 stops supplying oil to the control oil circuit 3, and the oil in the suspension device 4 can return to the fuel tank through the control oil circuit 3 and the falling solenoid valve 2, so that the suspension device 4 can descend under its own weight.

[0036] By adopting the present invention, through the rising solenoid valve 1 and the falling solenoid valve 2, the control oil circuit 3 can be respectively switched to a locked state, an oil supply state or an oil return state; when the control oil circuit 3 is in the locked state, the suspension device 4 works normally in suspension; when the control oil circuit 3 is in the oil supply state, the suspension device 4 rises; when the control oil circuit 3 is in the oil return state, the suspension device 4 descends; thus, the suspension, rising and falling of the suspension device 4 can be controlled, realizing the active control of the suspended height of the cab and facilitating the adaptation to various working conditions.

[0037] Furthermore, the suspension device 4 includes a suspension oil cylinder 41, a suspension solenoid valve 42, and an accumulator 43. One end of the suspension solenoid valve 42 is provided with a pressure oil port, and both the accumulator 43 and the control oil circuit 3 are connected to the pressure oil port of the suspension solenoid valve 42. The other end of the suspension solenoid valve 42 is provided with a first working interface and a second working interface. The first working interface of the suspension solenoid valve 42 is connected to the large chamber of the suspension oil cylinder 41, and the second working interface of the suspension oil cylinder 41 is connected to the small chamber of the suspension oil cylinder 41. When the suspension solenoid valve 42 is opened, both the first working interface and the second working interface of the suspension solenoid valve 42 are communicated with the pressure oil port.

[0038] Note: The large chamber of the suspension oil cylinder 41 is the side of its cylinder body, and the small chamber of the suspension oil cylinder 41 is the side of its piston rod. The suspension solenoid valve 42 can adopt a three-way valve. When the suspension solenoid valve 42 is opened, its pressure oil port is communicated with the first working interface and the second working interface simultaneously through the valve core. During installation, the cylinder body of the suspension oil cylinder 41 is fixed on the chassis of the tractor, and the piston rod is connected to the suspended cab.

[0039] The oil in the control oil circuit 3 can provide the same pressure for the large chamber and the small chamber of the control suspension oil cylinder 41 through the pressure oil port. The pressure difference generated by the difference in the oil cross-sectional areas of the large chamber and the small chamber is used to push the piston rod of the suspension oil cylinder 41 to move, thereby controlling the expansion and contraction of the suspension oil cylinder 41 and realizing the active control of the suspension height of the cab. The control efficiency is high, the impact caused by the too-fast expansion and contraction of the suspension oil cylinder 41 is avoided, and the service life of components such as the suspension solenoid valve 42 is prolonged. When the control oil circuit 3 stops supplying oil and returning oil, that is, when it is in the locked state, the pressure difference gradually reaches equilibrium with the load on the piston rod of the suspension oil cylinder 41, ensuring that the suspension oil cylinder 41 remains suspended near the working height. Thus, only one accumulator 43 is needed to maintain the working height of the suspension oil cylinder 41, and there is no need to separately set accumulators 43 at both ends of the suspension oil cylinder 41, saving the number of accumulators 43 and reducing the device cost. In addition, when the chassis is impacted and the load of the suspension oil cylinder 41 fluctuates, the oil in the large chamber of the suspension oil cylinder 41 flows into the small chamber and the accumulator 43 simultaneously through the suspension solenoid valve 42 (or the oil in the small chamber and the accumulator 43 of the suspension oil cylinder 41 flows into the large chamber simultaneously through the suspension solenoid valve 42), realizing the absorption of impact energy. At the same time, by adjusting the opening degree of the suspension solenoid valve 42, the oil flow damping can be adjusted, thereby changing the hardness of the suspension device 4, adapting to different terrain conditions and operation requirements, and improving the shock absorption effect and comfort.

[0040] Furthermore, the suspension device 4 further includes a lift check valve 44 and a lower check valve 45. The inlets of both the lift check valve 44 and the lower check valve 45 are connected to the pressure oil port of the suspension solenoid valve 42. The outlet of the lift check valve 44 is connected to the first working interface of the suspension solenoid valve 42, and the outlet of the lower check valve 45 is connected to the second working interface of the suspension oil cylinder 41.

[0041] When the control oil circuit 3 is in the oil supply state, the oil in the control oil circuit 3 passes through the raise check valve 44 and the lower check valve 45, so as to provide the same pressure for the large chamber and the small chamber of the control suspension cylinder 41, which is convenient for quickly controlling the raise of the control suspension cylinder 41 without changing the working state of the suspension solenoid valve 42, with high control efficiency and good working stability.

[0042] Furthermore, the suspension device 4 further includes a control unit and a displacement sensor 46 capable of monitoring the extension amount of the suspension cylinder 41. The displacement sensor 46, the raise solenoid valve 1 and the lower solenoid valve 2 are respectively connected to the control unit through signals; the control unit can receive a preset extension amount input manually, and the control unit controls the opening and closing of the raise solenoid valve 1 and the lower solenoid valve 2 according to the displacement signal of the displacement sensor 46 and the preset extension amount.

[0043] Note: The displacement sensor 46 can be connected to the piston rod of the suspension cylinder 41 or to the suspended cab loaded by the piston rod of the suspension cylinder 41, so as to monitor the extension amount of the suspension cylinder 41. The control unit can adopt the tractor ECU, and the ECU belongs to the prior art; the preset extension amount is the range value directly input manually to the control unit during operation.

[0044] An automatic control mode is realized. In the automatic control mode, the extension amount of the suspension cylinder 41 is monitored by the displacement sensor 46, and the control unit controls the opening and closing of the raise solenoid valve 1 and the lower solenoid valve 2, which is convenient for controlling the extension amount of the suspension cylinder 41 within the preset extension amount range and improves the reliability.

[0045] Furthermore, the control unit controls the opening and closing of the raise solenoid valve 1 and the lower solenoid valve 2 according to the displacement signal of the displacement sensor 46 and the preset extension amount, including: The control unit compares the displacement signal with the preset extension amount. When the displacement signal is within the preset extension amount range, the control unit controls the raise solenoid valve 1 to close and the lower solenoid valve 2 to close; when the displacement signal is lower than the preset extension amount range, the control unit controls the raise solenoid valve 1 to open and the lower solenoid valve 2 to close; when the displacement signal is higher than the preset extension amount range, the control unit controls the raise solenoid valve 1 to close and the lower solenoid valve 2 to open.

[0046] For example: the preset extension amount is 50% ± 5%. When the displacement signal is within the range of 50% ± 5%, the raise solenoid valve 1 closes and the lower solenoid valve 2 closes, ensuring that the suspension cylinder 41 remains suspended near the working height; when the displacement signal is lower than 45%, the raise solenoid valve 1 opens and the lower solenoid valve 2 closes, which is convenient for controlling the extension of the suspension cylinder 41 to within the preset extension amount range; when the displacement signal is higher than 55%, the raise solenoid valve 1 closes and the lower solenoid valve 2 opens, which is convenient for controlling the retraction of the suspension cylinder 41 to within the preset extension amount range.

[0047] It is convenient to implement the automatic control mode, and the operator can set the preset extension amount according to his own feeling, so as to actively adjust the height of the suspended cab, improving the operation comfort.

[0048] Furthermore, at least two suspension devices 4 are provided, the number of control oil circuits 3 is the same as that of the suspension devices 4, and each control oil circuit 3 is correspondingly connected to the pressure oil port of the suspension device 4; the outlet of the rising solenoid valve 1 is respectively connected to each control oil circuit 3 through a branch; the inlet of the descending solenoid valve 2 is connected to each control oil circuit 3 through a shunt.

[0049] It is convenient to control multiple suspension devices 4 at the same time. Through multiple suspension devices 4, they can be installed on the left and right sides of the tractor cab and other necessary positions to realize the suspension needs of multiple positions of the cab and the absorption of impact energy, with strong adaptability.

[0050] Furthermore, a first one-way valve 7 is also provided on the branch from the outlet of the rising solenoid valve 1 to the control oil circuit 3, and the first one-way valve 7 can supply hydraulic fluid to flow unidirectionally from the rising solenoid valve 1 to the control oil circuit 3; the outlet of the rising solenoid valve 1 is also connected to a feedback oil circuit 8, and the feedback oil circuit 8 is used to connect to the feedback oil port of the load-sensing pump, and the total supply oil circuit 5 is used to connect to the outlet of the load-sensing pump; a return oil port is also provided on the rising solenoid valve 1, and the return oil port of the rising solenoid valve 1 is connected to the total return oil circuit 6.

[0051] It avoids the leakage of the hydraulic fluid of the suspension device 4 through the rising solenoid valve 1, improving the reliability; the outlet pressure of the rising solenoid valve 1 is fed back to the load-sensing pump through the feedback oil circuit 8, and the load-sensing pump supplies oil to the rising solenoid valve 1. When the rising solenoid valve 1 is closed, the oil pressure at its outlet and the feedback oil circuit 8 returns oil through the return oil port, so that the load-sensing pump stops the high-power output in time, avoiding energy waste and reducing energy consumption.

[0052] Furthermore, a first throttle valve 9 is also provided at the outlet of the rising solenoid valve 1; the feedback oil circuit 8 is connected between the outlet of the rising solenoid valve 1 and the first throttle valve 9.

[0053] Through the first throttle valve 9, it is convenient to slow down the extension speed of the suspension cylinder 41 and reduce the impact; at the same time, it avoids affecting the response speed of the feedback oil circuit 8.

[0054] Furthermore, a second one-way valve 12 is also provided on the branch from the inlet of the descending solenoid valve 2 to the control oil circuit 3, and the second one-way valve 12 can supply hydraulic fluid to flow unidirectionally from the control oil circuit 3 to the descending solenoid valve 2.

[0055] Furthermore, a second throttle valve 10 is also provided on the total supply oil circuit 5; a third throttle valve 11 is also provided on the total return oil circuit 6.

[0056] The second throttle valve 10 facilitates the control of the pressure difference between the feedback oil passage 8 and the inlet of the main oil supply passage 5; the third throttle valve 11 facilitates the reduction of the retraction speed of the suspension cylinder 41 and the reduction of impact.

[0057] In the description of the present invention, it should be understood that if descriptive terms indicating orientation, direction or positional relationship appear, such as: "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of understanding the present invention and simplifying the description, rather than indicating or implying that the part, element or whole referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0058] In addition, if descriptive terms indicating order appear, such as: "first", "second", etc., their use in this specification is for the convenience of understanding or simplifying the description. For example, in order to distinguish multiple technical features of the same type or function and having to be mentioned separately, this specification may use the way of prefixing or suffixing order descriptive terms to distinguish them. Therefore, it should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0059] In the present invention, if descriptive terms of the relative relationship between structure and function are used, such as: "installed", "connected", "joined", "fixed", etc., unless otherwise clearly specified and limited, a broad understanding should be made. For example, "installed", "connected", "joined", etc. can be a fixed connection, a detachable connection, or integrated; can be a mechanical connection, an electrical connection; can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements; "fixed" can be a fixed integration, or a detachable fixation through fasteners; can be directly fixed, or fixed through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above descriptive terms in the present invention can be understood according to the specific situation, the context, the coherence of the context before and after, etc.

[0060] In the present invention, if there are descriptive terms with affiliated or connecting meanings, for example, the first feature is "above" or "below" the second feature, unless otherwise clearly specified and defined, it should not be understood in a restrictive sense. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, and the coherence of the context before and after.

[0061] Furthermore, the first feature being "above", "over", and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below", and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments, examples, and the features of different embodiments and examples described in this specification, and these combinations or combinations should all fall within the scope encompassed by the present invention.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can, within the scope of information available in the public domain, make changes, modifications, substitutions, and variations to the above embodiments in combination with the technical revelations given in this application document, and still fall within the protection scope of this application.

Claims

1. An actively adjustable hydraulic system for a suspended cab, characterized in that: It includes a raise solenoid valve (1), a lower solenoid valve (2), a control oil circuit (3), and a suspension device (4). The inlet of the raise solenoid valve (1) is provided with a main oil supply circuit (5), and the outlet of the lower solenoid valve (2) is provided with a main oil return circuit (6). The outlet of the raise solenoid valve (1) and the inlet of the lower solenoid valve (2) are both connected to the control oil circuit (3); the control oil circuit (3) is connected to the pressure oil port of the suspension device (4).

2. The actively adjustable suspension cab hydraulic system according to claim 1, characterized in that: The suspension device (4) includes a suspension oil cylinder (41), a suspension solenoid valve (42), and an accumulator (43). One end of the suspension solenoid valve (42) is provided with a pressure oil port, and the accumulator (43) and the control oil circuit (3) are both connected to the pressure oil port of the suspension solenoid valve (42); the other end of the suspension solenoid valve (42) is provided with a first working interface and a second working interface. The first working interface of the suspension solenoid valve (42) is connected to the large chamber of the suspension oil cylinder (41), and the second working interface of the suspension oil cylinder (41) is connected to the small chamber of the suspension oil cylinder (41); when the suspension solenoid valve (42) is opened, the first working interface and the second working interface of the suspension solenoid valve (42) are both communicated with the pressure oil port.

3. The actively adjustable suspension cab hydraulic system according to claim 2, characterized in that: The suspension device (4) further includes a raise check valve (44) and a lower check valve (45). The inlets of the raise check valve (44) and the lower check valve (45) are both connected to the pressure oil port of the suspension solenoid valve (42). The outlet of the raise check valve (44) is connected to the first working interface of the suspension solenoid valve (42), and the outlet of the lower check valve (45) is connected to the second working interface of the suspension oil cylinder (41).

4. The actively adjustable suspension cab hydraulic system according to claim 2, wherein: The suspension device (4) further includes a control unit and a displacement sensor (46) capable of monitoring the extension amount of the suspension oil cylinder (41). The displacement sensor (46), the raise solenoid valve (1), and the lower solenoid valve (2) are respectively connected to the control unit through signals; The control unit can receive a preset extension amount input manually. The control unit controls the opening and closing of the raise solenoid valve (1) and the lower solenoid valve (2) according to the displacement signal of the displacement sensor (46) and the preset extension amount.

5. The actively adjustable suspension cab hydraulic system according to claim 4, characterized in that: The control unit controls the opening and closing of the raise solenoid valve (1) and the lower solenoid valve (2) according to the displacement signal of the displacement sensor (46) and the preset extension amount, including: The control unit compares the displacement signal with the preset extension amount. When the displacement signal is within the preset extension amount range, the control unit controls the raise solenoid valve (1) to close and the lower solenoid valve (2) to close; when the displacement signal is lower than the preset extension amount range, the control unit controls the raise solenoid valve (1) to open and the lower solenoid valve (2) to close; when the displacement signal is higher than the preset extension amount range, the control unit controls the raise solenoid valve (1) to close and the lower solenoid valve (2) to open.

6. The actively adjustable suspension cab hydraulic system according to claim 1, wherein: There are at least two suspension devices (4). The number of control oil circuits (3) is the same as the number of suspension devices (4). Each control oil circuit (3) is correspondingly connected to the pressure oil port of the suspension device (4); the outlet of the raise solenoid valve (1) is respectively connected to each control oil circuit (3) through a branch; the inlet of the lower solenoid valve (2) is connected to each control oil circuit (3) through a shunt.

7. The actively adjustable suspension cab hydraulic system according to claim 6, wherein: A first one-way valve (7) is further provided on the branch line from the outlet of the lifting solenoid valve (1) to the control oil circuit (3). The first one-way valve (7) can supply hydraulic oil to flow unidirectionally from the lifting solenoid valve (1) to the control oil circuit (3). The outlet of the lifting solenoid valve (1) is further connected to a feedback oil circuit (8), and the feedback oil circuit (8) is used to connect to the feedback oil port of the load-sensitive pump. The total oil supply circuit (5) is used to connect to the outlet of the load-sensitive pump. The lifting solenoid valve (1) is further provided with an oil return port, and the oil return port of the lifting solenoid valve (1) is connected to the total oil return circuit (6).

8. The actively adjustable suspended cab hydraulic system according to claim 7, characterized in that: A first throttle valve (9) is further provided at the outlet of the lifting solenoid valve (1). The feedback oil circuit (8) is connected between the outlet of the lifting solenoid valve (1) and the first throttle valve (9).

9. The actively adjustable suspended cab hydraulic system according to claim 6, characterized in that: A second one-way valve (12) is further provided on the branch line from the inlet of the lowering solenoid valve (2) to the control oil circuit (3). The second one-way valve (12) can supply hydraulic oil to flow unidirectionally from the control oil circuit (3) to the lowering solenoid valve (2).

10. The actively adjustable suspension cab hydraulic system according to claim 1, characterized in that: A second throttle valve (10) is further provided on the total oil supply circuit (5). A third throttle valve (11) is further provided on the total oil return circuit (6).

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