Suspension cylinder hydraulic system and all-terrain tire crane

Abstract

This application discloses a suspension cylinder hydraulic system and an all-terrain tire crane. The system includes a suspension cylinder assembly, a hydraulic oil tank, and an incoming pressure oil source. The first and second rod-side ports are connected via a first connecting oil passage, and the first and second rodless-side ports are connected via a second connecting oil passage. The hydraulic oil tank is connected to the first connecting oil passage via a first connecting oil passage equipped with a first switching valve and to the second connecting oil passage via a second connecting oil passage equipped with a second switching valve. The incoming pressure oil source is used to selectively replenish oil to the first or second connecting oil passage. The hydraulic system of this application has undergone partial optimization by adding an incoming pressure oil source and adding an oil port for oil and air discharge in the suspension cylinder. The oil from the incoming pressure oil source can selectively replenish oil to the corresponding rod-side or rodless-side chamber in the cylinder via the first or second connecting oil passage, thereby promoting the discharge of air from the oil chamber and improving the working performance of the oil spring suspension.

Description

Technical Field

[0001] This application belongs to the field of construction machinery, specifically relating to an all-terrain tire crane and its suspension cylinder hydraulic system. Background Technology

[0002] like Figure 1 As shown, the rear suspension of an off-road tire crane is generally a hydraulic spring suspension, typically consisting of two suspension cylinders: a first suspension cylinder 1 and a second suspension cylinder 2. The rodless and rod-side chambers of the first and second suspension cylinders are connected in an X-shape and connected to the hydraulic oil tank 3 (i.e., the return oil tank) via oil circuits equipped with switching valves. When both the first switching valve Y1 and the second switching valve Y2 are energized, the oil in the suspension cylinders is connected to the hydraulic oil tank 3, and the rear suspension is in a flexible state. In this flexible state, the bumps during travel cause the hydraulic oil in the two suspension cylinders to be forced out of the hydraulic oil tank 3 and drawn into the cylinders by negative pressure.

[0003] However, the presence of air in the suspension cylinders initially reduces the elastic modulus of the hydraulic oil, impairing the performance of the oil spring suspension. This severely impacts both tire-loading and driving conditions of the crane. During tire-loading, air in the suspension cylinders causes the vehicle to tilt during load rotation, increasing the risk of rollover accidents. During driving, air in the suspension cylinders leads to poor rear axle damping, affecting ride comfort. Therefore, it is crucial to optimize and improve the suspension cylinder hydraulic system to facilitate cylinder venting and enhance vehicle performance. Summary of the Invention

[0004] The purpose of this application is to provide a suspension cylinder hydraulic system and an off-road tire crane, which can effectively control the venting of the suspension cylinder to improve the working performance of the oil spring suspension and the overall performance of the machine.

[0005] To achieve the above objectives, according to a first aspect of this application, a suspension cylinder hydraulic system is provided, comprising:

[0006] A suspension cylinder assembly includes a first suspension cylinder and a second suspension cylinder. The first suspension cylinder has a first rod-side port, a first rodless port, and a third rodless port for venting oil and gas. The second suspension cylinder has a second rod-side port, a second rodless port, and a fourth rodless port for venting oil and gas. The first rodless port and the second rod-side port are connected by a first connecting oil passage, and the first rod-side port and the second rodless port are connected by a second connecting oil passage.

[0007] The hydraulic oil tank is connected to the first connecting oil circuit via a first connecting oil circuit equipped with a first switching valve, and to the second connecting oil circuit via a second connecting oil circuit equipped with a second switching valve; and

[0008] A pressurized oil source is introduced to selectively replenish oil to the first or second connecting oil circuit.

[0009] In some embodiments of this application, a third connecting oil circuit is connected between the introduced pressure oil source and the first connecting oil circuit, and a third switching valve is provided in the third connecting oil circuit; a fourth connecting oil circuit is connected between the introduced pressure oil source and the second connecting oil circuit, and a fourth switching valve is provided in the fourth connecting oil circuit.

[0010] In some embodiments of this application, a fifth connecting oil circuit is provided between the third rodless chamber oil port and the hydraulic oil tank, and a fifth switching valve is provided in the fifth connecting oil circuit; a sixth connecting oil circuit is provided between the fourth rodless chamber oil port and the hydraulic oil tank, and a sixth switching valve is provided in the sixth connecting oil circuit.

[0011] In some embodiments of this application, the first switching valve and the second switching valve are rigid-flexible switching valve groups of the suspension cylinder group.

[0012] In some embodiments of this application, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, and the sixth switching valve are all two-position, two-way solenoid switching valves. The suspension cylinder hydraulic system further includes an exhaust controller, configured as follows:

[0013] Control the first switching valve and the second switching valve to disconnect the first connecting oil circuit and the second connecting oil circuit, so that the suspension cylinder assembly is in a suspended rigid state;

[0014] Control the third switching valve and the fifth switching valve to open the third connecting oil circuit and the fifth connecting oil circuit, so that air is discharged from the rodless chamber of the first suspension cylinder and the rod chamber of the second suspension cylinder through the third rodless chamber oil port;

[0015] Once the piston rod of the cylinder in the suspension cylinder assembly reaches its limit extension position, switch the control of the third switching valve and the fifth switching valve to disconnect the third connecting oil circuit and the fifth connecting oil circuit;

[0016] Control the fourth switching valve and the sixth switching valve to open the fourth connecting oil circuit and the sixth connecting oil circuit, so that air in the rod chamber of the first suspension cylinder and the rodless chamber of the second suspension cylinder is discharged through the fourth rodless chamber oil port;

[0017] Once the piston rod of the suspension cylinder assembly reaches its maximum extension position, the fourth and sixth switching valves are switched to disconnect the fourth and sixth connecting oil circuits, thus ending the venting of the suspension cylinder assembly.

[0018] In some embodiments of this application, the suspension cylinder hydraulic system further includes:

[0019] External container;

[0020] The first pressure testing hose connects the third rodless chamber oil port to the external container;

[0021] The second pressure testing hose connects the fourth rodless chamber oil port to the external container.

[0022] In some embodiments of this application, the third rodless chamber port is connected to the first pressure measuring hose, and the fourth rodless chamber port is connected to the second pressure measuring hose via pressure measuring connectors.

[0023] In some embodiments of this application, the suspension cylinder hydraulic system includes a third directional valve and a fourth directional valve. The main valve inlet ports on one side of the third directional valve and the fourth directional valve are both connected to the introduced pressure oil source, and the main valve return ports are both connected to the hydraulic oil tank. The other side of the third directional valve is provided with a first working port connected to the first connecting oil circuit and a second working port connected to the third rodless chamber port. The other side of the fourth directional valve is provided with a third working port connected to the second connecting oil circuit and a fourth working port connected to the fourth rodless chamber port.

[0024] In some embodiments of this application, the first switching valve and the second switching valve are both two-position two-way valves, and the third reversing valve and the fourth reversing valve are both two-position four-way valves.

[0025] Furthermore, according to a second aspect of this application, an all-terrain tire crane is provided, the all-terrain tire crane including the suspension cylinder hydraulic system described above in this application.

[0026] In some embodiments of this application, the off-road tire crane includes a front axle suspension as a rigid suspension and a rear axle suspension as a flexible suspension, the rear axle suspension including a rear swing arm and the suspension cylinder hydraulic system.

[0027] In some embodiments of this application, the all-terrain tire crane includes a traveling hydraulic system, a slewing hydraulic system, and a lifting hydraulic system, and the introduced pressure oil source is low-pressure oil whose oil pressure is lower than the working oil pressure of the traveling hydraulic system, the slewing hydraulic system, and the lifting hydraulic system.

[0028] In the hydraulic system of the suspension cylinder of this application, an oil port for venting oil and gas is added to the suspension cylinder, and a pressurized oil source is added to the hydraulic system. Oil can be selectively supplied to the corresponding rod-side or rodless-side chamber of the cylinder through a first or second connecting oil circuit, thereby venting air from the oil chamber. This allows for timely control of air venting in the suspension cylinder, thereby improving the working performance of the oil spring suspension and the overall performance of the machine. The hydraulic system of this application features localized optimization design without significantly increasing system complexity. The solution is simple and feasible, effectively achieving cylinder venting control with significant results.

[0029] Other features and advantages of the embodiments of this application will be described in detail in the following detailed embodiments section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0031] Figure 1 Hydraulic schematic diagram of existing suspension cylinder hydraulic system;

[0032] Figure 2 This is a hydraulic schematic diagram of the suspension cylinder hydraulic system according to the first embodiment of this application;

[0033] Figure 3 This is a hydraulic schematic diagram of the suspension cylinder hydraulic system according to the first embodiment of this application;

[0034] Figure 4 This is a hydraulic schematic diagram of the suspension cylinder hydraulic system according to the first embodiment of this application;

[0035] Figure 5 This is a structural schematic diagram of the rear suspension system of an off-road tire crane according to a specific embodiment of this application.

[0036] Explanation of reference numerals in the attached figures

[0037] 1 First suspension cylinder 2 Second suspension cylinder

[0038] 3. Hydraulic oil tank; 4. Inlet pressure oil source

[0039] 5 First pressure testing hose 6 Second pressure testing hose

[0040] 7. Pressure test connector

[0041] R1 First rod chamber port; R2 Second rod chamber port

[0042] P1 First rodless chamber oil port; P2 Second rodless chamber oil port

[0043] P3 Third rodless chamber oil port; P4 Fourth rodless chamber oil port

[0044] L1 First connecting oil circuit L2 Second connecting oil circuit

[0045] L01 First connecting oil circuit L02 Second connecting oil circuit

[0046] L03 Third connecting oil circuit; L04 Fourth connecting oil circuit

[0047] L05 Fifth connecting oil circuit L06 Sixth connecting oil circuit

[0048] Y1 First switching valve Y2 Second switching valve

[0049] Y3 Third switch valve Y4 Fourth switch valve

[0050] Y5 Fifth switching valve; Y6 Sixth switching valve

[0051] Y3' Third directional valve; Y4' Fourth directional valve

[0052] A1 First working oil port; A2 Second working oil port

[0053] A3 Third working oil port; A4 Fourth working oil port

[0054] P Main valve inlet T Main valve return port

[0055] 100 rear axle, 200 frame

[0056] 300 tires, 400 rear swing frame Detailed Implementation

[0057] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this application.

[0058] The following description, with reference to the accompanying drawings, describes a suspension cylinder hydraulic system and an all-terrain tire crane according to this application.

[0059] like Figure 2 As shown, in one specific embodiment, a novel suspension cylinder hydraulic system is disclosed, comprising:

[0060] The suspension cylinder assembly includes a first suspension cylinder 1 and a second suspension cylinder 2. The first suspension cylinder 1 is provided with a first rod-side port R1, a first rodless port P1, and a third rodless port P3 for venting oil and gas. The second suspension cylinder 2 is provided with a second rod-side port R2, a second rodless port P2, and a fourth rodless port P4 for venting oil and gas. The first rodless port P1 and the second rod-side port R2 are connected by a first connecting oil passage L1, and the first rod-side port R1 and the second rodless port P2 are connected by a second connecting oil passage L2.

[0061] Hydraulic oil tank 3 is connected to a first connecting oil passage L1 via a first connecting oil passage L01 equipped with a first switching valve Y1, and to a second connecting oil passage L2 via a second connecting oil passage L02 equipped with a second switching valve Y2; and

[0062] Introduce pressure oil source 4 and selectively replenish oil to the first connecting oil circuit L1 or the second connecting oil circuit L2.

[0063] As can be seen, the suspension cylinder hydraulic system of this application adds a third rodless chamber port P3 and a fourth rodless chamber port P4 for oil and gas discharge, as well as an external pressure oil source 4, to control the venting of the suspension cylinder in a timely manner, thereby improving the working performance of the oil spring suspension. The following will specifically explain how the venting of the rod and rodless chambers of each suspension cylinder in the suspension cylinder group is achieved by introducing the pressure oil source 4 and combining it with the on / off control of the switching valve. The optimized design of the hydraulic system of this application does not significantly increase the system complexity; the solution is simple and feasible, effectively achieving cylinder venting control with significant results.

[0064] In comparison, one of the main methods for venting suspension cylinders is to passively replenish oil and vent air by driving on bumpy roads; the other is to use auxiliary equipment to simulate bumpy roads, such as using a forklift to repeatedly lift the two rear axle tires of the machine to vent air. Both of these venting methods are time-consuming, labor-intensive, and ineffective.

[0065] Specifically, see Figure 2After adding the pressure oil source 4, a third connecting oil circuit L03 is connected between the pressure oil source 4 and the first connecting oil circuit L1. The third connecting oil circuit L03 is equipped with a third switching valve Y3. A fourth connecting oil circuit L04 is connected between the pressure oil source 4 and the second connecting oil circuit L2. The fourth connecting oil circuit L04 is equipped with a fourth switching valve Y4. In this way, by controlling the switching of the third switching valve Y3 and the fourth switching valve Y4, the third connecting oil circuit L03 and the fourth connecting oil circuit L04 can be controlled to be opened or closed, which facilitates selective control of the external hydraulic oil supplied to the specific rod chamber or rodless chamber of the suspension cylinder assembly. For example, when the third switching valve Y3 is energized, opening the third connecting oil circuit L03, hydraulic oil from the pressure oil source 4 is introduced into the first connecting oil circuit L1, thereby flowing to the rodless chamber of the first suspension cylinder 1 and the rod chamber of the second suspension cylinder 2 for replenishment. The oil-gas mixture in the rodless chamber of the first suspension cylinder 1 and the rod chamber of the second suspension cylinder 2 will be forced to exit through the third rodless chamber port P3. Similarly, when the fourth switching valve Y4 is energized, opening the fourth connecting oil circuit L04, hydraulic oil from the pressure oil source 4 is introduced into the second connecting oil circuit L2, thereby flowing to the rod chamber of the first suspension cylinder 1 and the rodless chamber of the second suspension cylinder 2 for replenishment. The oil-gas mixture in the rod chamber of the first suspension cylinder 1 and the rodless chamber of the second suspension cylinder 2 will be forced to exit through the fourth rodless chamber port P4.

[0066] To control the discharge of the oil-gas mixture from the third rodless chamber port P3 or the fourth rodless chamber port P4, in Figure 2 In the illustrated embodiment, a fifth connecting oil circuit L05 connects the third rodless chamber oil port P3 to the hydraulic oil tank 3, and a fifth switching valve Y5 is installed in the fifth connecting oil circuit L05. A sixth connecting oil circuit L06 connects the fourth rodless chamber oil port P4 to the hydraulic oil tank 3, and a sixth switching valve Y6 is installed in the sixth connecting oil circuit L06. Thus, by controlling the switching of the fifth switching valve Y5 and the sixth switching valve Y6, the oil-air mixture in the cylinder can be discharged into the hydraulic oil tank 3. Optionally, it can be discharged into the hydraulic oil tank 3 after passing through an oil filtration device.

[0067] The first switching valve Y1 and the second switching valve Y2 constitute the rigidity / flexibility switching valve group of the suspension cylinder assembly. When both the first switching valve Y1 and the second switching valve Y2 are energized, the first connecting oil circuit L01 and the second connecting oil circuit L02 are both connected, linking the suspension cylinder to the hydraulic oil tank 3, thus placing the suspension cylinder assembly in a flexible state, allowing the piston rod and cylinder to slide relative to each other. When both the first switching valve Y1 and the second switching valve Y2 are de-energized, the first connecting oil circuit L01 and the second connecting oil circuit L02 are both cut off, isolating the suspension cylinder from the hydraulic oil tank 3, thus placing the suspension cylinder assembly in a rigid state, fixing the positions of the left and right pistons. When an exhaust action is required, connecting the introduced pressure oil source 4, the rigidity / flexibility switching valve group needs to be switched to the rigid state beforehand, i.e. Figure 2Both the first switching valve Y1 and the second switching valve Y2 in the system are in a de-energized state.

[0068] exist Figure 2 In this embodiment, the first switching valve Y1, the second switching valve Y2, the third switching valve Y3, the fourth switching valve Y4, the fifth switching valve Y5, and the sixth switching valve Y6 are all two-position, two-way solenoid switching valves. In this case, the suspension cylinder hydraulic system also includes an exhaust controller, configured as follows:

[0069] Control the first switching valve Y1 and the second switching valve Y2 to disconnect the first connecting oil circuit L01 and the second connecting oil circuit L02, so that the suspension cylinder assembly is in a suspended rigid state.

[0070] Control the third switching valve Y3 and the fifth switching valve Y5 to open the third connecting oil circuit L03 and the fifth connecting oil circuit L05, so that air is discharged from the rodless chamber of the first suspension cylinder 1 and the rod chamber of the second suspension cylinder 2 through the third rodless chamber oil port P3.

[0071] Once the piston rod of the cylinder in the suspension cylinder assembly has reached its limit extension position, switch the control of the third switching valve Y3 and the fifth switching valve Y5 to disconnect the third connecting oil circuit L03 and the fifth connecting oil circuit L05.

[0072] Control the fourth switching valve Y4 and the sixth switching valve Y6 to open the fourth connecting oil circuit L04 and the sixth connecting oil circuit L06, so that air is discharged from the rod chamber of the first suspension cylinder 1 and the rodless chamber of the second suspension cylinder 2 through the fourth rodless chamber oil port P4.

[0073] Once the piston rod of the suspension cylinder assembly reaches its maximum extension position, switch the control valves Y4 and Y6 to disconnect the fourth connecting oil circuit L04 and the sixth connecting oil circuit L06, thus ending the venting of the suspension cylinder assembly.

[0074] By combining the above control process of multiple electromagnetic switching valves, the air in the rod chamber and rodless chamber on both sides of the suspension cylinder assembly can be completely removed in sequence, thereby improving the safety of tire lifting conditions and enhancing driving comfort.

[0075] exist Figure 3 In the illustrated embodiment, with Figure 2 Similar, the difference lies in Figure 3 The suspension cylinder hydraulic system also includes:

[0076] External container (not shown in the diagram);

[0077] The first pressure testing hose 5 connects the third rodless chamber oil port P3 to the external container; and

[0078] The second pressure testing hose 6 connects the fourth rodless chamber oil port P4 to the external container.

[0079] Furthermore, the third rodless chamber oil port P3 and the first pressure measuring hose 5, and the fourth rodless chamber oil port P4 and the second pressure measuring hose 6 can be connected respectively through pressure measuring connectors 7.

[0080] Thus, with pressure testing connectors 7 and pressure testing hoses connected to the external ports P3 and P4 of the rodless chamber of the first suspension cylinder 1 and the second suspension cylinder 2 respectively, and both the first and second switching valves Y1 and Y2 being de-energized, energizing the third switching valve Y3 allows the oil-gas mixture in port P3 of the first suspension cylinder 1 to be discharged through the first pressure testing hose 5. Energizing the fourth switching valve Y4 allows the oil-gas mixture in port P4 of the second suspension cylinder 2 to be discharged through the second pressure testing hose 6. The discharged oil-gas mixture needs to be discharged into a container, specifically an external container. After purging the air, the pressure testing hose can be removed.

[0081] exist Figure 4 In the illustrated embodiment, it is also related to Figure 2 Similar, the difference lies in Figure 4 The suspension cylinder hydraulic system includes a third directional valve Y3' and a fourth directional valve Y4'. The main valve inlet P on one side of the third directional valve Y3' and the fourth directional valve Y4' are both connected to the pressure oil source 4, and the main valve return port T is connected to the hydraulic oil tank 3. The other side of the third directional valve Y3' is provided with a first working port A1 connected to the first connecting oil circuit L1 and a second working port A2 connected to the third rodless chamber port P3. The other side of the fourth directional valve Y4' is provided with a third working port A3 connected to the second connecting oil circuit L2 and a fourth working port A4 connected to the fourth rodless chamber port P4.

[0082] in, Figure 4 The embodiment also involves local optimization of the hydraulic system, similarly introducing other pressurized oil sources to replenish the suspension cylinder and expel air from inside the cylinder. This is achieved by replacing the third directional valve Y3' and the fourth directional valve Y4'. Figure 2 The third switching valve Y3, the fourth switching valve Y4, the fifth switching valve Y5, and the sixth switching valve Y6 in the embodiment.

[0083] Similarly, when the first switching valve Y1 and the second switching valve Y2 are simultaneously de-energized, disconnecting the first connecting oil circuit L01 and the second connecting oil circuit L02, and making the suspension cylinder assembly in a suspended rigid state, the third directional valve Y3' is energized and switched to the left position in the figure. The main valve inlet P is connected to the first working oil port A1, and the hydraulic oil introduced from the pressure oil source 4 is supplied to the rodless chamber of the first suspension cylinder 1 and the rod chamber of the second suspension cylinder 2 through the first connecting oil circuit L1. This drives the oil-gas mixture in the rodless chamber of the first suspension cylinder 1 and the rod chamber of the second suspension cylinder 2 to be discharged through the third rodless chamber oil port P3, and then discharged to the hydraulic oil tank 3 through the second working oil port A2 of the third directional valve Y3' and the main valve return oil port T, completing the venting on one side. Similarly, when venting is required on the other side, the fourth directional valve Y4' is energized and switched to the left position shown in the figure. The main valve inlet P is connected to the first working port A3, and the hydraulic oil from the pressure oil source 4 is introduced to replenish the rod chamber of the first suspension cylinder 1 and the rodless chamber of the second suspension cylinder 2 through the second connecting oil circuit L2. This drives the oil-gas mixture in the rod chamber of the first suspension cylinder 1 and the rodless chamber of the second suspension cylinder 2 to be discharged through the fourth rodless chamber port P4, and then discharged to the hydraulic oil tank 3 through the fourth working port A4 of the fourth directional valve Y4' and the main valve return port T, thus completing the venting on the other side.

[0084] exist Figure 4 In this design, the first switching valve Y1 and the second switching valve Y2 can be simple two-position two-way valves, and the third reversing valve Y3' and the fourth reversing valve Y4' can be two-position four-way valves. The valve bodies are simple and practical. However, it should be noted that each switching valve can also be a more complex multi-position multi-way valve. This application is not limited to this.

[0085] The requirement emphasizes that in the suspension cylinder hydraulic system of this application, the suspension cylinder should be in a rigid state when venting; otherwise, the introduced hydraulic oil will flow directly into the hydraulic oil tank 3, affecting the venting effect. Furthermore, the hydraulic oil introduced into the pressure source 4 should be low-pressure oil with a low pressure; otherwise, it will lead to excessive rigidity of the suspension cylinder assembly, affecting driving comfort. Of course, it would be more convenient if the pressure source 4 came from the machine's own hydraulic system.

[0086] In addition, this application also discloses an off-road tire crane that includes the aforementioned suspension cylinder hydraulic system, thereby improving the safety of tire lifting operations and enhancing driving comfort.

[0087] Off-road tire cranes are non-highway vehicles primarily used in deserts, oil fields, mines, and ports. They can travel off-road, perform tire-based lifting, and travel with loads. Off-road tire cranes generally consist of a front axle suspension (rigid suspension) and a rear axle suspension (flexible suspension). Small and medium-tonnage off-road tire cranes are mostly equipped with two axles, while large-tonnage products are equipped with three axles.

[0088] It should be noted that the suspension cylinder hydraulic system of this application is not limited to use as an oil spring in all-terrain cranes, but can also be applied to other engineering machinery that requires the use of oil springs.

[0089] Reference Figure 5 The rear axle suspension includes a rear swing arm 400 and the aforementioned suspension cylinder hydraulic system. The first and second suspension cylinders are elastically supported between the rear swing arm 400 and the vehicle frame 200, respectively. The rear swing arm 400 is mounted on the rear axle 100, and tires 300 are mounted on both sides of the rear axle 100. In this way, the rear axle suspension, acting as oil springs, effectively dampens shocks between the vehicle frame 200 and the tires 300, especially after the air in the suspension cylinders is expelled, making the effect of the oil springs even more significant.

[0090] A cross-country tire crane typically includes a traveling hydraulic system, a slewing hydraulic system, and a lifting hydraulic system. Among them, the introduced pressure oil source 4 is a low-pressure oil whose oil pressure is lower than the working oil pressure of the traveling hydraulic system, the slewing hydraulic system, and the lifting hydraulic system, or it comes from the working oil circuit of the hydraulic system itself with low oil pressure.

[0091] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A suspension cylinder hydraulic system, characterized in that, The suspension cylinder hydraulic system includes: The suspension cylinder assembly includes a first suspension cylinder (1) and a second suspension cylinder (2). The first suspension cylinder (1) is provided with a first rod-side port (R1), a first rodless port (P1), and a third rodless port (P3) for oil and gas discharge. The second suspension cylinder (2) is provided with a second rod-side port (R2), a second rodless port (P2), and a fourth rodless port (P4) for oil and gas discharge. The first rodless port (P1) and the second rod-side port (R2) are connected by a first connecting oil passage (L1), and the first rod-side port (R1) and the second rodless port (P2) are connected by a second connecting oil passage (L2). The hydraulic oil tank (3) is connected to the first connecting oil passage (L1) via a first connecting oil passage (L01) equipped with a first switching valve (Y1) and to the second connecting oil passage (L2) via a second connecting oil passage (L02) equipped with a second switching valve (Y2); and A pressurized oil source (4) is introduced to selectively replenish oil to the first connecting oil circuit (L1) or the second connecting oil circuit (L2); The pressure oil source (4) is connected to the first connecting oil circuit (L1) by a third connecting oil circuit (L03), which contains a third switching valve (Y3). The pressure oil source (4) is connected to the second connecting oil circuit (L2) by a fourth connecting oil circuit (L04), which contains a fourth switching valve (Y4). The rodless chamber port (P3) is connected to the hydraulic oil tank (3) by a fifth connecting oil circuit (L05). The fifth connecting oil circuit (L05) is provided with a fifth switching valve (Y5), and the fourth rodless chamber oil port (P4) is connected to the hydraulic oil tank (3) by a sixth connecting oil circuit (L06), and the sixth connecting oil circuit (L06) is provided with a sixth switching valve (Y6); the first switching valve (Y1), the second switching valve (Y2), the third switching valve (Y3), the fourth switching valve (Y4), the fifth switching valve (Y5), and the sixth switching valve (Y6) are all two-position two-way electromagnetic switching valves; The suspension cylinder hydraulic system also includes an exhaust controller, configured as follows: Control the first switching valve (Y1) and the second switching valve (Y2) to disconnect the first connecting oil circuit (L01) and the second connecting oil circuit (L02), so that the suspension cylinder assembly is in a suspended rigid state; Control the third switching valve (Y3) and the fifth switching valve (Y5) to open the third connecting oil passage (L03) and the fifth connecting oil passage (L05), so that air in the rodless chamber of the first suspension cylinder (1) and the rod chamber of the second suspension cylinder (2) is discharged through the third rodless chamber port (P3); Once the piston rod of the cylinder in the suspension cylinder assembly reaches its limit extension position, switch the control of the third switching valve (Y3) and the fifth switching valve (Y5) to disconnect the third connecting oil circuit (L03) and the fifth connecting oil circuit (L05). Control the fourth switching valve (Y4) and the sixth switching valve (Y6) to open the fourth connecting oil passage (L04) and the sixth connecting oil passage (L06), so that air in the rod chamber of the first suspension cylinder (1) and the rodless chamber of the second suspension cylinder (2) is discharged through the fourth rodless chamber oil port (P4); Once the piston rod of the suspension cylinder assembly reaches its limit extension position, switch the control of the fourth switch valve (Y4) and the sixth switch valve (Y6) to disconnect the fourth connecting oil circuit (L04) and the sixth connecting oil circuit (L06), and the venting of the suspension cylinder assembly ends.

2. The suspension cylinder hydraulic system according to claim 1, characterized in that, The first switching valve (Y1) and the second switching valve (Y2) are the rigid-flexible switching valve groups of the suspension cylinder group.

3. The suspension cylinder hydraulic system according to claim 1, characterized in that, The suspension cylinder hydraulic system also includes: External container; The first pressure testing hose (5) is connected to the third rodless chamber oil port (P3) and the external container; The second pressure testing hose (6) connects the fourth rodless chamber oil port (P4) to the external container.

4. The suspension cylinder hydraulic system according to claim 3, characterized in that, The third rodless chamber port (P3) is connected to the first pressure measuring hose (5), and the fourth rodless chamber port (P4) is connected to the second pressure measuring hose (6) via pressure measuring connectors (7).

5. The suspension cylinder hydraulic system according to claim 1, characterized in that, The suspension cylinder hydraulic system includes a third directional valve (Y3') and a fourth directional valve (Y4'). The main valve inlet (P) on one side of the third directional valve (Y3') and the fourth directional valve (Y4') are both connected to the introduced pressure oil source (4), and the main valve return port (T) is connected to the hydraulic oil tank (3). The other side of the third directional valve (Y3') is provided with a first working port (A1) connected to the first connecting oil circuit (L1) and a second working port (A2) connected to the third rodless chamber port (P3). The other side of the fourth directional valve (Y4') is provided with a third working port (A3) connected to the second connecting oil circuit (L2) and a fourth working port (A4) connected to the fourth rodless chamber port (P4).

6. The suspension cylinder hydraulic system according to claim 5, characterized in that, The first switching valve (Y1) and the second switching valve (Y2) are both two-position two-way valves, and the third reversing valve (Y3') and the fourth reversing valve (Y4') are both two-position four-way valves.

7. A cross-country tire crane, characterized in that, The off-road tire crane includes a suspension cylinder hydraulic system according to any one of claims 1 to 6.

8. The all-terrain tire crane according to claim 7, characterized in that, The off-road tire crane includes a front axle suspension as a rigid suspension and a rear axle suspension as a flexible suspension, the rear axle suspension including a rear swing arm (400) and the suspension cylinder hydraulic system.

9. The all-terrain tire crane according to claim 7, characterized in that, The off-road tire crane includes a traveling hydraulic system, a slewing hydraulic system and a lifting hydraulic system. The introduced pressure oil source (4) is low-pressure oil with an oil pressure lower than the working oil pressure of the traveling hydraulic system, the slewing hydraulic system and the lifting hydraulic system.

Images