Hydraulic system for mixing tank and mixer truck

Abstract

This disclosure relates to a hydraulic system for driving a mixing tank and a mixer truck. The hydraulic system includes a hydraulic motor, a first pressure source, and a second pressure source. The hydraulic motor drives the mixing tank of the mixer truck to rotate. The first pressure source includes an engine and a first hydraulic pump, and is capable of supplying pressurized oil to the hydraulic motor to drive the mixing tank to rotate. The second pressure source includes an electric motor and a second hydraulic pump, and is capable of supplying pressurized oil to the hydraulic motor to drive the mixing tank to rotate. The hydraulic system has a first operating mode and a second operating mode. In the first operating mode, the first pressure source supplies pressurized oil to the hydraulic motor; in the second operating mode, the second pressure source supplies pressurized oil to the hydraulic motor. This hydraulic system improves the reliability of the system, simplifies the system structure, and achieves fuel savings and environmental protection.

Description

Technical Field

[0001] This disclosure relates to the technical field of mixer truck components, specifically to a hydraulic system for driving a mixing tank and a mixer truck. Background Technology

[0002] In concrete construction sites, such as building construction and bridge construction, there are often manual finishing touches, such as grouting and filling gaps in doors, windows, and bridges. In these cases, the amount of concrete used is small, and the construction time is long, sometimes lasting 5-6 hours. During this process, the mixing tank needs to operate continuously at a speed of 1-3 rpm or higher to ensure the concrete does not solidify and allows construction to proceed normally. To maintain the continuous operation of the mixing tank, the engine needs to remain running at idle speed or higher. Furthermore, during the unloading process at construction sites, the speed of concrete pouring often causes concrete mixer trucks to queue for unloading, sometimes for 1-3 hours. During this waiting period, the engine also remains idle to prevent the concrete in the mixing tank from solidifying. The continuous idling of the engine not only results in high fuel consumption but also incomplete combustion, causing environmental pollution. Summary of the Invention

[0003] The purpose of this disclosure is to provide a hydraulic system for driving a mixing tank and a mixer truck. This hydraulic system for driving a mixing tank is beneficial for achieving fuel saving and environmental protection.

[0004] To achieve the above objectives, this disclosure provides a hydraulic system for driving a mixing tank, including a hydraulic motor, a first pressure source, and a second pressure source, wherein the hydraulic motor is used to drive the mixing tank of a mixer truck to rotate.

[0005] The first pressure source includes an engine and a first hydraulic pump, which can supply pressurized oil to the hydraulic motor to drive the mixing tank to rotate; the second pressure source includes a motor and a second hydraulic pump, which can supply pressurized oil to the hydraulic motor to drive the mixing tank to rotate; wherein, the mixing tank driving hydraulic system has a first working mode and a second working mode, in the first working mode, the first pressure source supplies pressurized oil to the hydraulic motor, and in the second working mode, the second pressure source supplies pressurized oil to the hydraulic motor.

[0006] Optionally, the mixing tank driving hydraulic system is configured to automatically switch between a first operating mode and a second operating mode based on the relationship between the oil pressure at the outlet of the first hydraulic pump and the oil pressure at the outlet of the second hydraulic pump; when the oil pressure at the outlet of the first hydraulic pump is greater than the oil pressure at the outlet of the second hydraulic pump, the mixing tank driving hydraulic system remains in the first operating mode; when the oil pressure at the outlet of the first hydraulic pump is less than the oil pressure at the outlet of the second hydraulic pump, the mixing tank driving hydraulic system automatically switches from the first operating mode to the second operating mode.

[0007] Optionally, the hydraulic system driving the mixing tank further includes a switching valve group, which is simultaneously located in the oil circuit between the first hydraulic pump and the hydraulic motor, and in the oil circuit between the second hydraulic pump and the hydraulic motor. The switching valve group is used to selectively supply pressurized oil from the first hydraulic pump and the second hydraulic pump to the hydraulic motor.

[0008] Optionally, the switching valve group includes a first valve and a second valve; the first valve is disposed in the oil passage between the oil outlet of the first hydraulic pump and the first oil inlet of the hydraulic motor to open the oil passage, drive the hydraulic motor to rotate forward, or cut off the oil passage; the second valve is disposed in the oil passage between the oil outlet of the first hydraulic pump and the second oil inlet of the hydraulic motor to open the oil passage, drive the hydraulic motor to rotate in reverse, or cut off the oil passage.

[0009] Optionally, the switching valve group further includes a third valve and a fourth valve; the third valve is disposed in the oil passage between the oil outlet of the second hydraulic pump and the first oil inlet of the hydraulic motor to open the oil passage, drive the hydraulic motor to rotate forward, or cut off the oil passage; the fourth valve is disposed in the oil passage between the oil outlet of the second hydraulic pump and the second oil inlet of the hydraulic motor to open the oil passage, drive the hydraulic motor to rotate in reverse, or cut off the oil passage.

[0010] Optionally, the first valve, the second valve, the third valve, and the fourth valve are all hydraulically controlled valves; the first control port of the first valve and the first control port of the second valve are both connected to the first ports of the third valve and the fourth valve, the second control port of the first valve is connected to the first port of the first valve, and the second control port of the second valve is connected to the first port of the second valve; both the first valve and the second valve are configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port.

[0011] Optionally, the switching valve assembly further includes a first oil circuit, a second oil circuit, and a first shuttle valve. The two ends of the first oil circuit are respectively connected to the first oil port of the first valve and the first oil port of the second valve. The first shuttle valve is disposed in the first oil circuit. The first oil inlet of the first shuttle valve is connected to the first oil port of the first valve, and the second oil inlet of the first shuttle valve is connected to the first oil port of the second valve. One end of the second oil circuit is connected to the oil outlet of the first shuttle valve, and the other end of the second oil circuit is respectively connected to the first control oil port of the third valve and the first control oil port of the fourth valve.

[0012] Optionally, the first valve, the second valve, the third valve, and the fourth valve are all hydraulically controlled valves; the first control port of the third valve and the first control port of the fourth valve are both connected to the first port of the first valve and the first port of the second valve, the second control port of the third valve is connected to the first port of the third valve, and the second control port of the fourth valve is connected to the first port of the fourth valve; the third valve and the fourth valve are both configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port.

[0013] Optionally, the switching valve assembly further includes a third oil circuit, a fourth oil circuit, and a second shuttle valve. The two ends of the third oil circuit are respectively connected to the first oil port of the third valve and the first oil port of the fourth valve. The second shuttle valve is disposed in the third oil circuit. The first oil inlet of the second shuttle valve is connected to the first oil port of the third valve, and the second oil inlet of the second shuttle valve is connected to the first oil port of the fourth valve. One end of the fourth oil circuit is connected to the oil outlet of the second shuttle valve, and the other end of the fourth oil circuit is respectively connected to the first control oil port of the first valve and the first control oil port of the second valve.

[0014] According to another aspect of this disclosure, a mixer truck is provided, including a vehicle body, a mixing tank mounted on the vehicle body, and the aforementioned mixing tank drive hydraulic system, the mixing tank drive hydraulic system being used to drive the mixing tank to rotate on the vehicle body.

[0015] Through the above technical solution, during the normal loading, transportation, and unloading of the mixer truck, the hydraulic system driving the mixing tank starts in the first working mode. A first pressure source, consisting of the engine and a first hydraulic pump, delivers pressurized oil to the hydraulic motor, which then drives the mixing tank to rotate. In situations requiring prolonged engine idling, such as concrete finishing and patching or queuing for unloading, the engine can be shut off. A second pressure source, consisting of a motor and a second hydraulic pump, then delivers pressurized oil to the hydraulic motor, which in turn drives the mixing tank to rotate. Thus, by setting up both a first and a second pressure source, the reliability of the hydraulic system driving the mixing tank is improved. For example, if one pressure source malfunctions, the other can independently drive the mixing tank. Furthermore, it meets the requirements of different working conditions, avoiding prolonged engine idling during concrete finishing and patching or queuing for unloading, thus preventing fuel waste and environmental pollution caused by incomplete combustion. Therefore, it contributes to fuel saving and environmental protection.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of a hydraulic system for driving a mixing tank according to one embodiment of the present disclosure;

[0019] Figure 2 yes Figure 1 The diagram shows an enlarged schematic of the switching valve group in the hydraulic system driving the mixing tank.

[0020] Explanation of reference numerals in the attached figures

[0021] 10-Hydraulic motor; 21-Engine; 22-First hydraulic pump; 31-Motor; 32-Second hydraulic pump; 40-Switching valve assembly; 41-First valve; a1-First port of the first valve; b1-Second port of the first valve; c1-First control port of the first valve; d1-Second control port of the first valve; 42-Second valve; a2-First port of the second valve; b2-Second port of the second valve; c2-First control port of the second valve; d2-Second control port of the second valve; 43-Third valve; a3-First port of the third valve; b3 - Second oil port of the third valve; c3- First control oil port of the third valve; d3- Second control oil port of the third valve; 44- Fourth valve; a4- First oil port of the fourth valve; b4- Second oil port of the fourth valve; c4- First control oil port of the fourth valve; d4- Second control oil port of the fourth valve; 51- First oil circuit; 52- Second oil circuit; 53- Third oil circuit; 54- Fourth oil circuit; 61- First shuttle valve; 62- Second shuttle valve; 70- First subsystem; 80- Second subsystem; 90- Oil tank; 100- Mixing tank; 110- Reduction mechanism. Detailed Implementation

[0022] The specific embodiments of this disclosure 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 this disclosure.

[0023] In the description of this disclosure, it should be noted that the terms “first,” “second,” “third,” “fourth,” etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "configured as," "connected to," and "connected" should be interpreted broadly. For example, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0025] like Figure 1 and Figure 2As shown, according to one aspect of this disclosure, a mixing tank driving hydraulic system is provided, which includes a hydraulic motor 10, a first pressure source 20, and a second pressure source 30. The hydraulic motor 10 is used to drive the mixing tank 100 of a mixer truck to rotate. The first pressure source 20 includes an engine 21 and a first hydraulic pump 22, and the first pressure source 20 is capable of supplying pressurized oil to the hydraulic motor 10 to drive the mixing tank 100 to rotate. The second pressure source 30 includes a motor 31 and a second hydraulic pump 32, and the second pressure source 30 is capable of supplying pressurized oil to the hydraulic motor 10 to drive the mixing tank 100 to rotate. The mixing tank driving hydraulic system has a first operating mode and a second operating mode. In the first operating mode, the first pressure source 20 supplies pressurized oil to the hydraulic motor 10, and in the second operating mode, the second pressure source 30 supplies pressurized oil to the hydraulic motor 10.

[0026] Through the above technical solution, during the normal loading, transportation, and unloading process of the mixer truck, the hydraulic system driving the mixing tank starts in the first working mode. The first pressure source 20, composed of the engine 21 and the first hydraulic pump 22, delivers pressurized oil to the hydraulic motor 10, which in turn drives the mixing tank 100 to rotate. In situations requiring prolonged idling, such as concrete finishing or queuing for unloading, the engine 21 can be shut off. The second pressure source 30, composed of the motor 31 and the second hydraulic pump 32, then delivers pressurized oil to the hydraulic motor 10, which in turn drives the mixing tank 100 to rotate. Thus, by setting up the first pressure source 20 and the second pressure source 30, the reliability of the hydraulic system driving the mixing tank can be improved. For example, if one pressure source malfunctions, the other can independently drive the mixing tank 100. On the other hand, it can meet the requirements of different working conditions and avoid the long-term idling of engine 21 in conditions such as concrete finishing and patching or queuing for unloading, thus avoiding fuel waste and environmental pollution caused by incomplete combustion. Therefore, it is conducive to achieving the goals of fuel saving and environmental protection.

[0027] Optionally, in one embodiment of this disclosure, the hydraulic system driving the mixing tank may further include a third operating mode, in which the first pressure source 20 and the second pressure source 30 can simultaneously supply pressurized oil to the hydraulic motor 10. Since the first pressure source 20 and the second pressure source 30 supply oil simultaneously, it is beneficial to increase the supply flow rate of pressurized oil, thereby beneficial to increase the rotational speed of the hydraulic motor 10, and thus improve the mixing efficiency of the mixing tank 100.

[0028] like Figure 1As shown, in one embodiment of this disclosure, the mixing tank drive hydraulic system can be configured to automatically switch between a first operating mode and a second operating mode based on the relationship between the oil pressure at the outlet of the first hydraulic pump 22 and the oil pressure at the outlet of the second hydraulic pump 32. When the oil pressure at the outlet of the first hydraulic pump 22 is greater than the oil pressure at the outlet of the second hydraulic pump 32, the mixing tank drive hydraulic system remains in the first operating mode. When the oil pressure at the outlet of the first hydraulic pump 22 is less than the oil pressure at the outlet of the second hydraulic pump 32, the mixing tank drive hydraulic system automatically switches from the first operating mode to the second operating mode.

[0029] Because the hydraulic system driving the mixing tank can automatically switch between the first and second working modes, when the engine 21 of the mixer truck stops working or idles, the motor 31 can automatically and promptly replace the engine 21 to drive the mixing tank 100 to rotate normally. Therefore, it is beneficial to improve the automation level of the hydraulic system driving the mixing tank, and at the same time, it can also further achieve the effect of saving fuel and protecting the environment.

[0030] When the oil pressure at the outlet of the first hydraulic pump 22 is equal to the oil pressure at the outlet of the second hydraulic pump 32, the hydraulic system driving the mixing tank can automatically switch to the third working mode mentioned above.

[0031] It is understood that, in this disclosure, the mixing tank drive hydraulic system can not only automatically switch between various operating modes, but also be configured for manual switching. For example, a switching button can be provided, allowing the driver to switch between different operating modes. For instance, when the mixer truck needs to queue for a long time to unload, the driver can operate the switching button to manually switch the mixing tank drive hydraulic system from the first operating mode to the second operating mode. Furthermore, to further save fuel and reduce environmental impact, the engine 21 can be shut off.

[0032] In addition, it is understood that in other embodiments of this disclosure, the first pressure source 20 and the second pressure source can also work independently without affecting each other.

[0033] In this disclosure, the first pressure source 20 and the second pressure source 30 can either supply pressurized oil to the hydraulic motor 10 through completely independent oil circuits, or they can share a portion of the oil circuit; this disclosure does not limit this. Optionally, as... Figure 1As shown, in one embodiment of this disclosure, the hydraulic system driving the mixing tank may further include a switching valve assembly 40. The switching valve assembly 40 is simultaneously disposed in the oil circuit between the first hydraulic pump 22 and the hydraulic motor 10, and in the oil circuit between the second hydraulic pump 32 and the hydraulic motor 10. The switching valve assembly 40 is used to selectively supply pressure oil from the first hydraulic pump 22 and the second hydraulic pump 32 to the hydraulic motor 10. That is, in this embodiment, by providing the switching valve assembly 40, the pressure oil provided by the first pressure source 20 and the pressure oil provided by the second pressure source 30 can share the oil circuit between the switching valve assembly 40 and the hydraulic motor 10, thus simplifying the structure of the hydraulic system driving the mixing tank.

[0034] This disclosure does not limit the specific structure of the switching valve assembly 40. Optionally, such as Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the switching valve group 40 may include a first valve 41 and a second valve 42. The first valve 41 may be disposed in the oil passage between the oil outlet of the first hydraulic pump 22 and the first oil inlet of the hydraulic motor 10 to conduct the oil passage, that is, to conduct the oil passage between the oil outlet of the first hydraulic pump 22 and the first oil inlet of the hydraulic motor 10, thereby driving the hydraulic motor 10 to rotate forward and mix the concrete, or to cut off the oil passage to prevent the pressure oil of the first pressure source 20 from entering the first oil inlet of the hydraulic motor 10.

[0035] The second valve 42 can be installed in the oil passage between the oil outlet of the first hydraulic pump 22 and the second oil inlet of the hydraulic motor 10 to open the oil passage, that is, to open the oil passage between the oil outlet of the first hydraulic pump 22 and the second oil inlet of the hydraulic motor 10, thereby driving the hydraulic motor 10 to reverse and unload the concrete, or to cut off the oil passage to prevent the pressure oil of the first pressure source 20 from entering the second oil inlet of the hydraulic motor 10.

[0036] Optionally, such as Figure 1 and Figure 2 As shown, the switching valve group 40 may also include a third valve 43 and a fourth valve 44. The third valve 43 is located in the oil passage between the oil outlet of the second hydraulic pump 32 and the first oil inlet of the hydraulic motor 10 to open the oil passage, that is, to open the oil passage between the oil outlet of the second hydraulic pump 32 and the first oil inlet of the hydraulic motor 10, thereby driving the hydraulic motor 10 to rotate forward and mix the concrete, or to cut off the oil passage to prevent the pressure oil of the second pressure source 30 from entering the first oil inlet of the hydraulic motor 10.

[0037] The fourth valve 44 is located in the oil passage between the oil outlet of the second hydraulic pump 32 and the second oil inlet of the hydraulic motor 10 to open the oil passage, that is, to open the oil passage between the oil outlet of the second hydraulic pump 32 and the second oil inlet of the hydraulic motor 10, thereby driving the hydraulic motor 10 to reverse and unload the concrete, or to cut off the oil passage to prevent the pressure oil of the second pressure source 30 from entering the second oil inlet of the hydraulic motor 10.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the first valve 41, the second valve 42, the third valve 43, and the fourth valve 44 can all be hydraulically controlled valves. The first control port c1 of the first valve and the first control port c2 of the second valve are both connected to the first port a3 of the third valve and the first port a4 of the fourth valve. That is, the first control port c1 of the first valve is connected to the first port a3 of the third valve and the first port a4 of the fourth valve, respectively, and the first control port c2 of the second valve is connected to the first port a3 of the third valve and the first port a4 of the fourth valve, respectively. The second control port d1 of the first valve is connected to the first port a1 of the first valve, and the second control port d2 of the second valve is connected to the first port a2 of the second valve. Both the first valve 41 and the second valve 42 are configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port. That is, the first valve 41 is configured to open when the oil pressure at the second control port d1 of the first valve is greater than the oil pressure at the first control port c1 of the first valve, so that the pressure oil from the first hydraulic pump 22 can flow into the hydraulic motor 10 through the second port b1 of the first valve to drive the mixing tank 100 to rotate forward. It closes when the oil pressure at the second control port d1 of the first valve is less than or equal to the oil pressure at the first control port c1 of the first valve. The second valve 42 is configured to open when the oil pressure at the second control port d2 of the second valve is greater than the oil pressure at the first control port c2 of the second valve, so that the pressure oil from the first hydraulic pump 22 can flow into the hydraulic motor 10 through the second port b2 of the second valve to drive the mixing tank 100 to rotate in reverse. It closes when the oil pressure at the second control port d2 of the second valve is less than or equal to the oil pressure at the second control port c2 of the first valve.

[0039] Optionally, such as Figure 1 and Figure 2As shown, the first control port c3 of the third valve and the first control port c4 of the fourth valve are both connected to the first port a1 of the first valve and the first port a2 of the second valve. That is, the first control port c3 of the third valve is connected to the first port a1 of the first valve and the first port a2 of the second valve, and the first control port c4 of the fourth valve is connected to the first port a1 of the first valve and the first port a2 of the second valve, respectively. The second control port d3 of the third valve is connected to the first port a3 of the third valve, and the second control port d4 of the fourth valve is connected to the first port a4 of the fourth valve. Both the third valve 43 and the fourth valve 44 are configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port. That is, each of the third valves 43 is configured to open when the oil pressure at the second control port d3 of the third valve is greater than the oil pressure at the first control port c3 of the third valve, so that the pressure oil from the second hydraulic pump 32 can flow into the hydraulic motor 10 through the second port b3 of the third valve to drive the mixing tank 100 to rotate forward. It closes when the oil pressure at the second control port d3 of the third valve is less than or equal to the oil pressure at the first control port c3 of the third valve. The fourth valve 44 is configured to open when the oil pressure at the second control port d4 of the fourth valve is greater than the oil pressure at the first control port c4 of the fourth valve, so that the pressure oil from the second hydraulic pump 32 can flow into the hydraulic motor 10 through the second port b4 of the fourth valve to drive the mixing tank 100 to rotate in reverse. It closes when the oil pressure at the second control port d4 of the fourth valve is less than or equal to the oil pressure at the second control port c4 of the fourth valve.

[0040] In this embodiment, when the hydraulic oil pressure pumped by the first hydraulic pump 22 is greater than the hydraulic oil pressure pumped by the second hydraulic pump 32, the oil pressure at the second control port of the first valve 41 or the second valve 42 is greater than the oil pressure at the first control port, thus causing the first valve 41 or the second valve 42 to open. Conversely, the oil pressure at the second control port of the third valve 43 or the fourth valve 44 is less than or equal to the oil pressure at the first control port, thus preventing the third valve 43 or the fourth valve 44 from opening. In this way, the mixing tank drive hydraulic system is in the first operating mode, and the hydraulic motor 10 is driven by the first pressure source 20. As mentioned above, this operating mode corresponds to the normal feeding, mixing, or unloading conditions of the mixing truck.

[0041] When the hydraulic oil pressure pumped by the first hydraulic pump 22 is less than or equal to the hydraulic oil pressure pumped by the second hydraulic pump 32, the oil pressure at the second control port of the first valve 41 or the second valve 42 is less than or equal to the oil pressure at the first control port. Therefore, the first valve 41 or the second valve 42 cannot be opened. For the third valve 43 or the fourth valve 44, the oil pressure at the second control port is greater than the oil pressure at the first control port. Therefore, the third valve 43 or the fourth valve 44 is opened. In this way, the hydraulic system driving the mixing tank can automatically switch from the first working mode to the second working mode, and the hydraulic motor 10 is driven by the second pressure source 30. As mentioned above, this working mode can correspond to situations such as the mixer truck being manually finished with concrete or waiting in line to unload.

[0042] As can be seen, in this disclosure, the above structure enables the hydraulic system driving the mixing tank to automatically switch between the first working mode and the second working mode.

[0043] It should be noted that, in this disclosure, the first preset pressure threshold, the second preset pressure threshold, the third preset pressure threshold, and the fourth preset pressure threshold can be any appropriate value. They can be the same or different, and this disclosure does not limit them.

[0044] like Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the first oil port a1 of the first valve, the first oil port a2 of the second valve, the first oil port a3 of the third valve, and the first oil port a4 of the fourth valve are all connected to their own second control oil ports (the second control oil ports d1, d2, d3, and d4 of the first valve), so that the corresponding valves are opened when the first oil port a1 of the first valve, the first oil port a2 of the second valve, the first oil port a3 of the third valve, and the first oil port a4 of the fourth valve reach a preset pressure threshold.

[0045] It is understood that in other embodiments of this disclosure, the first valve 41, the second valve 42, the third valve 43, and the fourth valve 44 can be solenoid valves, and pressure sensors are correspondingly provided. The corresponding valves are opened or closed based on the detection results of the pressure sensors. For example, the switching valve group 40 may include a first pressure sensor, which is used to detect the oil pressure at the first port a1 of the first valve. When the first pressure sensor detects that the oil pressure at the first port a1 of the first valve is greater than a first preset pressure threshold, it energizes the first valve, thereby opening the first valve. Similarly, a second, third, and fourth pressure sensor can be provided to detect the oil pressure at the first port a2 of the second valve, the first port a3 of the third valve, and the first port a4 of the fourth valve, respectively.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the switching valve assembly 40 may further include a first oil passage 51, a second oil passage 52, and a first shuttle valve 61. The two ends of the first oil passage 51 are respectively connected to the first oil port a1 of the first valve and the first oil port a2 of the second valve, as shown below. Figure 1 As shown, both ends of the first oil passage 51 are also connected to the A1 and B1 ports of the first subsystem 70 (see below). The first shuttle valve 61 is installed in the first oil passage 51. The first inlet of the first shuttle valve 61 is connected to the first port a1 of the first valve, and the second inlet of the first shuttle valve 61 is connected to the first port a2 of the second valve. One end of the second oil passage 52 is connected to the outlet of the first shuttle valve 61, and the other end of the second oil passage 52 is connected to the control port c3 of the third valve and the first control port c4 of the fourth valve.

[0047] In this embodiment, during the process of the first hydraulic pump 22 delivering pressurized oil from the first valve 41 to the hydraulic motor 10, the oil pressure between the first hydraulic pump 22 and the first inlet of the first shuttle valve 61 is greater than the oil pressure between the first hydraulic pump 22 and the second inlet of the first shuttle valve 61, causing the second inlet of the first shuttle valve 61 to close. At this time, a portion of the pressurized oil pumped by the first hydraulic pump 22 enters the hydraulic motor 10 through the first valve 41, and another portion enters the second oil circuit 52 through the first shuttle valve 61, supplying pressurized oil to the first control port c3 of the third valve and the first control port c4 of the fourth valve, respectively, so that the third valve 43 and the fourth valve 44 remain in the closed position.

[0048] Similarly, during the process of the first hydraulic pump 22 delivering pressurized oil from the second valve 42 to the hydraulic motor 10, the oil pressure between the first hydraulic pump 22 and the second inlet of the first shuttle valve 61 is greater than the oil pressure between the first hydraulic pump 22 and the first inlet of the first shuttle valve 61, causing the first inlet of the first shuttle valve 61 to close. At this time, a portion of the pressurized oil pumped by the first hydraulic pump 22 enters the hydraulic motor 10 through the second valve 42, and another portion enters the second oil circuit 52 through the second shuttle valve 62, providing pressurized oil to the first control port c1 of the first valve and the first control port c2 of the second valve, respectively, so that the third valve 43 and the fourth valve 44 remain in the closed position.

[0049] Optionally, such as Figure 1 and Figure 2 As shown, in one embodiment of this disclosure, the switching valve assembly 40 further includes a third oil passage 53, a fourth oil passage 54, and a second shuttle valve 62. The two ends of the third oil passage 53 are respectively connected to the first oil port a3 of the third valve and the first oil port a4 of the fourth valve, as shown... Figure 1As shown, both ends of the third oil passage 53 are also connected to ports A2 and B2 of the second subsystem 80 (see below). A second shuttle valve 62 is located in the third oil passage 53. The first inlet of the second shuttle valve 62 is connected to the first port a3 of the third valve, and the second inlet of the second shuttle valve 62 is connected to the first port a4 of the fourth valve. One end of the fourth oil passage 54 is connected to the outlet of the second shuttle valve 62, and the other end of the fourth oil passage 54 is connected to the first control port c3 of the first valve and the first control port c2 of the second valve.

[0050] In this embodiment, during the process of the second hydraulic pump 32 delivering pressurized oil from the third valve 43 to the hydraulic motor 10, the oil pressure between the second hydraulic pump 32 and the first inlet of the second shuttle valve 62 is greater than the oil pressure between the second hydraulic pump 32 and the second inlet of the second shuttle valve 62, causing the second inlet of the second shuttle valve 62 to close. At this time, a portion of the pressurized oil pumped by the second hydraulic pump 32 enters the hydraulic motor 10 via the third valve 43, and another portion enters the fourth oil circuit 54 via the second shuttle valve 62, providing pressurized oil to the first control port c1 of the first valve and the first control port c2 of the second valve, respectively, so that the first valve 41 and the second valve 42 remain in the closed position.

[0051] Similarly, during the process of the second hydraulic pump 32 delivering pressurized oil from the fourth valve 44 to the hydraulic motor 10, the oil pressure between the second hydraulic pump 32 and the second inlet of the second shuttle valve 62 is greater than the oil pressure between the second hydraulic pump 32 and the first inlet of the second shuttle valve 62, causing the first inlet of the second shuttle valve 62 to close. At this time, a portion of the pressurized oil pumped by the second hydraulic pump 32 enters the hydraulic motor 10 through the fourth valve 44, and another portion enters the fourth oil circuit 54 through the second shuttle valve 62, supplying pressurized oil to the first control port c1 of the first valve and the first control port c2 of the second valve, respectively, so that the first valve 41 and the second valve 42 remain in the closed position.

[0052] The advantages of using a shuttle valve are that it is small in size and easy to install. In addition, the special internal piston structure makes the oil pressure have almost no resistance interference to the piston, thus having excellent qualities such as fast opening and closing and low pressure loss, which is conducive to the smooth operation of the hydraulic system driving the mixing tank.

[0053] It is understood that, in this disclosure, the first shuttle valve 61 can be replaced by two switching valves. For example, the first switching valve and the second switching valve can be spaced apart on the first oil passage 51, and the connection point between the second oil passage 52 and the first oil passage 51 is located between the first switching valve and the second switching valve, wherein the first switching valve is close to the first valve 41 and the second switching valve is close to the second valve 42. In this way, during the process of the first hydraulic pump 22 delivering pressurized oil from the first valve to the hydraulic motor 10, the first switching valve can be opened and the second switching valve can be closed, so that a portion of the pressurized oil pumped by the first hydraulic pump 22 enters the hydraulic motor 10 through the first valve 41, and another portion enters the second oil passage 52 through the first shuttle valve 61, and provides pressurized oil to the first control port c3 of the third valve and the first control port c4 of the fourth valve, respectively. During the process of the first hydraulic pump 22 delivering pressurized oil from the second valve 42 to the hydraulic motor 10, the first switching valve can be closed and the second switching valve can be opened, so that part of the pressurized oil pumped by the first hydraulic pump 22 enters the hydraulic motor 10 through the second valve 42, and the other part enters the second oil circuit 52 through the first shuttle valve 61, and provides pressurized oil to the first control oil port c3 of the third valve and the first control oil port c4 of the fourth valve respectively.

[0054] It is understood that, in this disclosure, the second shuttle valve 62 can be replaced by two switching valves. For example, a third switching valve and a fourth switching valve are spaced apart on the second oil passage 52, and the connection position of the fourth oil passage 54 and the third oil passage 53 is located between the third switching valve and the fourth switching valve, wherein the third switching valve is close to the third valve 43 and the fourth switching valve is close to the fourth valve 44.

[0055] In this disclosure, each valve in the switching valve group 40 (first valve 41, second valve 42, third valve 43, fourth valve 44, first shuttle valve 61 and second shuttle valve 62) can be an individual valve, and each individual valve is connected through a relevant oil circuit, or it can be an integrated valve. This disclosure does not limit this.

[0056] Optionally, in one embodiment of this disclosure, the switching valve assembly 40 is an integrated valve. The housing of the integrated valve itself has related oil passages, such as the first oil passage 51, second oil passage 52, third oil passage 53, and fourth oil passage 54 mentioned above. The first valve 41, second valve 42, third valve 43, and fourth valve 44 can be cartridge valves, directly inserted into the housing of the integrated valve. Cartridge valves have a large flow capacity, simple and compact structure, and are easy to manufacture, which facilitates simplified pipeline connections, making the entire mixing tank drive hydraulic system compact and reliable. Moreover, by setting the above structure within the integrated valve, it is also beneficial to realize the switching between the first and second operating modes of the mixing tank drive hydraulic system.

[0057] like Figure 1As shown, optionally, the hydraulic system driving the mixing tank may further include a first subsystem 70 and a second subsystem 80. The first subsystem 70 may include the aforementioned engine 21 and a first hydraulic pump 22. The oil outlet of the first hydraulic pump 22 is connected to the first oil port a1 of the first valve through the A1 oil port of the first subsystem 70, and to the first oil port a2 of the second valve through the B1 oil port of the first subsystem 70. The second subsystem 80 may include the aforementioned motor 31 and a second hydraulic pump 32. The oil outlet of the second hydraulic pump 32 is connected to the first oil port a3 of the third valve through the A2 oil port of the first subsystem 70, and to the first oil port a4 of the fourth valve through the B2 oil port of the second subsystem 80.

[0058] like Figure 1 As shown, the hydraulic system driving the mixing tank may include an oil tank 90. ​​The first subsystem 70 and the second subsystem 80 can respectively draw pressurized oil from the oil tank 90 through the S port using the first pressure source 20 and the second pressure source 30. The pressurized oil from the first subsystem 70 and the second subsystem 80 can return to the oil tank 90 through the L1 and L2 ports. Similarly, the pressurized oil from the hydraulic motor 10 can return to the oil tank 90 through a pipeline.

[0059] like Figure 1 As shown, both the first subsystem 70 and the second subsystem 80 are equipped with detection points M1, M2, M3, M4 and M5 for detecting pressure.

[0060] like Figure 1 As shown, in one embodiment of this disclosure, the hydraulic system driving the mixing tank further includes a reduction mechanism 110, through which the hydraulic motor 10 drives the mixing tank 100.

[0061] According to another aspect of this disclosure, a mixer truck is provided, which includes a vehicle body, a mixing tank 100 mounted on the vehicle body, and the aforementioned mixing tank drive hydraulic system for driving the mixing tank 100 to rotate on the vehicle body.

[0062] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0064] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A hydraulic system for driving a mixing tank, characterized in that, include: A hydraulic motor (10) is used to drive the mixing tank (100) of the mixer truck to rotate; The first pressure source (20) includes an engine (21) and a first hydraulic pump (22); The second pressure source (30) includes a motor (31) and a second hydraulic pump (32); The hydraulic system driving the mixing tank also includes a switching valve group (40), which is simultaneously provided in the oil circuit between the first hydraulic pump (22) and the hydraulic motor (10) and the oil circuit between the second hydraulic pump (32) and the hydraulic motor (10). The switching valve group (40) is used to selectively supply the pressure oil of the first hydraulic pump (22) and the second hydraulic pump (32) to the hydraulic motor (10). The switching valve group (40) includes a first valve (41) and a second valve (42); the first valve (41) is located in the oil passage between the oil outlet of the first hydraulic pump (22) and the first oil inlet of the hydraulic motor (10); The second valve (42) is located in the oil passage between the oil outlet of the first hydraulic pump (22) and the second oil inlet of the hydraulic motor (10); The switching valve group (40) further includes a third valve (43) and a fourth valve (44); the third valve (43) is located in the oil passage between the oil outlet of the second hydraulic pump (32) and the first oil inlet of the hydraulic motor (10); the fourth valve (44) is located in the oil passage between the oil outlet of the second hydraulic pump (32) and the second oil inlet of the hydraulic motor (10). The hydraulic system driving the mixing tank has a first working mode and a second working mode. In the first working mode, the first pressure source (20) supplies pressure oil to the hydraulic motor (10). In the second working mode, the second pressure source (30) supplies pressure oil to the hydraulic motor (10). The hydraulic system driving the mixing tank is configured to automatically switch between the first working mode and the second working mode according to the relationship between the oil pressure at the outlet of the first hydraulic pump (22) and the oil pressure at the outlet of the second hydraulic pump (32); The first control port (c1) of the first valve and the first control port (c2) of the second valve are both connected to the first port (a3) ​​of the third valve and the first port (a4) of the fourth valve. The second control port (d1) of the first valve is connected to the first port (a1) of the first valve, and the second control port (d2) of the second valve is connected to the first port (a2) of the second valve. The first control port (c3) of the third valve and the first control port (c4) of the fourth valve are both connected to the first port (a1) of the first valve and the first port (a2) of the second valve. The second control port (d3) of the third valve is connected to the first port (a3) ​​of the third valve, and the second control port (d4) of the fourth valve is connected to the first port (a4) of the fourth valve.

2. The hydraulic system for driving the mixing tank according to claim 1, characterized in that, When the oil pressure at the outlet of the first hydraulic pump (22) is greater than the oil pressure at the outlet of the second hydraulic pump (32), the hydraulic system driving the mixing tank remains in the first working mode. When the oil pressure at the outlet of the first hydraulic pump (22) is less than the oil pressure at the outlet of the second hydraulic pump (32), the hydraulic system driving the mixing tank automatically switches from the first working mode to the second working mode.

3. The hydraulic system for driving the mixing tank according to claim 1, characterized in that, The first valve (41), the second valve (42), the third valve (43) and the fourth valve (44) are all hydraulic control valves; Both the first valve (41) and the second valve (42) are configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port.

4. The hydraulic system for driving the mixing tank according to claim 3, characterized in that, The switching valve group further includes a first oil passage (51), a second oil passage (52), and a first shuttle valve (61). The two ends of the first oil passage (51) are connected to the first oil port (a1) of the first valve and the first oil port (a2) of the second valve, respectively. The first shuttle valve (61) is disposed in the first oil passage (51). The first oil inlet of the first shuttle valve (61) is connected to the first oil port (a1) of the first valve. The second oil inlet of the first shuttle valve (61) is connected to the first oil port (a2) of the second valve. One end of the second oil passage (52) is connected to the oil outlet of the first shuttle valve (61). The other end of the second oil passage (52) is connected to the first control oil port (c3) of the third valve and the first control oil port (c4) of the fourth valve, respectively.

5. The hydraulic system for driving the mixing tank according to any one of claims 1-4, characterized in that, The first valve (41), the second valve (42), the third valve (43) and the fourth valve (44) are all hydraulic control valves; Both the third valve (43) and the fourth valve (44) are configured to open when the oil pressure at their second control port is greater than the oil pressure at their first control port, and to close when the oil pressure at their second control port is less than or equal to the oil pressure at their first control port.

6. The hydraulic system for driving the mixing tank according to claim 5, characterized in that, The switching valve group further includes a third oil passage (53), a fourth oil passage (54), and a second shuttle valve (62). The two ends of the third oil passage (53) are respectively connected to the first oil port (a3) ​​of the third valve and the first oil port (a4) of the fourth valve. The second shuttle valve (62) is located in the third oil passage (53). The first oil inlet of the second shuttle valve (62) is connected to the first oil port (a3) ​​of the third valve. The second oil inlet of the second shuttle valve (62) is connected to the first oil port (a4) of the fourth valve. One end of the fourth oil passage (54) is connected to the oil outlet of the second shuttle valve (62). The other end of the fourth oil passage (54) is respectively connected to the first control oil port (c1) of the first valve and the first control oil port (c2) of the second valve.

7. A mixer truck, characterized in that, The vehicle includes a vehicle body, a mixing tank (100) mounted on the vehicle body, and a mixing tank drive hydraulic system according to any one of claims 1-6, the mixing tank drive hydraulic system being used to drive the mixing tank (100) to rotate on the vehicle body.

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