WO2015043377A1 - Auxiliary hydraulic system and concrete pumping device - Google Patents
Auxiliary hydraulic system and concrete pumping device Download PDFInfo
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- WO2015043377A1 WO2015043377A1 PCT/CN2014/086346 CN2014086346W WO2015043377A1 WO 2015043377 A1 WO2015043377 A1 WO 2015043377A1 CN 2014086346 W CN2014086346 W CN 2014086346W WO 2015043377 A1 WO2015043377 A1 WO 2015043377A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
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- the invention relates to the technical field of auxiliary hydraulic systems, in particular to an auxiliary hydraulic system and a concrete pumping device.
- the hydraulic system of the construction machinery is generally divided into a main hydraulic system and an auxiliary hydraulic system.
- the auxiliary hydraulic system mainly performs auxiliary work such as hydraulic oil cooling.
- the auxiliary hydraulic system of the concrete pumping equipment mainly performs cooling, stirring, washing, and the like.
- the auxiliary hydraulic system has a high degree of integration, and generally can perform cooling, stirring and water washing in an independent hydraulic circuit.
- the existing auxiliary hydraulic system for concrete pumping equipment includes a main oil pump 1', a cooling motor 2', a reversing valve 3', a relief valve 4', a reversing valve 5', and an overflow.
- the action of the cooling motor 2' can be controlled to select whether to turn on the cooling function
- the supply direction of the pressurized oil can be controlled to select to start stirring.
- the reversing valve 7' is used to control the forward and reverse rotation of the agitating motor 8';
- the shut-off valve 9' of the inlet of the washing motor 10' is used to close when the washing motor 10' is not working to prevent the washing motor 10'
- the two ends generate a pressure difference and are reversed;
- the relief valves 4', 6' and 11' are used to protect the cooling motor 2', the agitation motor 8' and the water washing motor 10', respectively.
- Another object of the present invention is to provide a concrete pumping apparatus.
- the auxiliary hydraulic system of the present invention includes a main oil pump, a stirring motor, a water washing motor, a first reversing valve and a second reversing valve, wherein: the oil suction port of the main oil pump is connected to the oil tank, and the main oil pump The oil outlet is connected to the oil inlet of the first directional control valve, and the first working oil port and the second working oil port of the first directional control valve are respectively connected to the two oil ports of the stirring motor.
- the oil return port of the first reversing valve is connected to the oil inlet of the second reversing valve, and the first optional oil outlet and the second optional oil outlet of the second reversing valve are respectively connected to a first oil port of the water washing motor and a fuel tank, wherein the second oil port of the water washing motor is connected to the oil tank; or the oil suction port of the main oil pump is connected to the oil tank, and the oil outlet of the main oil pump is connected to the oil tank
- An oil inlet of the second reversing valve, the first selectable oil outlet and the second selectable oil outlet of the second reversing valve are respectively connected to the first oil port of the water washing motor and the first An oil inlet of the reversing valve, a second port of the water washing motor is connected to an oil inlet of the first reversing valve, and a first working port of the first reversing valve
- a second actuator port respectively connected to the two ports of the stirring motor, the first switching valve of the oil return port connected to the tank.
- the first reversing valve is a three-position four-way valve with a median function of M type or H type.
- the second reversing valve is a two-position three-way valve.
- the auxiliary hydraulic system further includes a first relief valve, the oil inlet of the first relief valve is connected to the first port of the water washing motor, and the overflow port of the first relief valve Connected to the second port of the water washing motor.
- the auxiliary hydraulic system further includes a cooling motor and a third reversing valve disposed between the oil outlet of the main oil pump and the oil inlet of the first reversing valve;
- An oil port is connected to an oil outlet of the main oil pump, a second oil port of the cooling motor is connected to an oil inlet of the first switching valve;
- the third switching valve is an on-off valve, and Two ports are respectively connected to the Cooling the first port and the second port of the motor;
- the auxiliary hydraulic system further includes a cooling motor disposed between the oil outlet of the main oil pump and the oil inlet of the second reversing valve a third directional control valve; a first oil port of the cooling motor is connected to an oil outlet of the main oil pump, and a second oil port of the cooling motor is connected to an oil inlet of the second directional control valve;
- the third reversing valve is an on-off valve, and the two ports thereof are respectively connected to the first port and the second port of the cooling motor.
- the auxiliary hydraulic system further includes a second relief valve, the oil inlet of the second relief valve is connected to the first port of the cooling motor, and the overflow port of the second relief valve Connected to the second port of the cooling motor.
- each of the reversing valves is a solenoid valve.
- the auxiliary hydraulic system further includes a third relief valve, an oil inlet of the third relief valve is connected to an oil outlet of the main oil pump, and an overflow port of the third relief valve is connected In the fuel tank.
- the concrete pumping apparatus of the present invention is provided with the auxiliary hydraulic system according to any one of the above.
- the concrete pumping device is a concrete pump truck.
- auxiliary hydraulic system of the present invention When the auxiliary hydraulic system of the present invention is used, by controlling the state of the second switching valve, it is possible to control the pressure oil to pass through the agitating motor and the water washing motor in sequence or sequentially through the water washing motor and the agitating motor to realize the stirring operation and the water washing operation.
- the first reversing valve uses a three-position four-way valve with a median function of M or H, which enables one or both of the agitator motor and the water washing motor to work simultaneously.
- the auxiliary hydraulic system further includes a cooling motor and a third reversing valve such that one of the three motors can work alone or two of them can operate simultaneously or three simultaneously.
- the oil outlet of the main oil pump is provided with a third overflow valve, which can prevent the main oil pump from being damaged due to excessive pressure when a certain motor and its corresponding overflow valve are damaged and blocked, thereby improving the main The service life of the oil pump.
- the concrete pumping apparatus of the present invention is provided with the above-described auxiliary hydraulic system. Since the above-mentioned auxiliary hydraulic system has the above technical effects, the concrete pumping apparatus also has a corresponding technical effect.
- FIG. 1 is a schematic view showing the principle of an auxiliary hydraulic system for a concrete pumping device
- FIG. 2 is a schematic diagram of the principle of an auxiliary hydraulic system according to an embodiment of the present invention.
- the auxiliary hydraulic system of this embodiment includes a main oil pump 1, a cooling motor 3, a stirring motor 7, a water washing motor 9, a first reversing valve 6, a second reversing valve 8, and a third reversing valve 4. .
- the oil inlet of the main oil pump 1 is connected to the oil tank
- the oil outlet of the main oil pump 1 is connected to the oil inlet of the cooling motor 3
- the oil outlet of the cooling motor 3 is connected to the oil inlet of the first reversing valve 6
- the third reversing valve 4 is an on-off valve.
- the third reversing valve 4 is a two-position two-way valve, and the two ports of the third reversing valve 4 are respectively connected to the cooling motor 3 The oil outlet and the oil inlet.
- the first working port A and the second working port B of the first reversing valve 6 are respectively connected to the two ports of the agitating motor 7, and the oil return port T of the first reversing valve 6 is connected to the second reversing valve
- the first reversing valve 6 is preferably a three-position four-way valve of the H-type, that is, the first reversing valve 6 has three working states, in the first working state.
- the oil inlet port P communicates with the first working oil port A
- the oil return port T communicates with the second working oil port B
- the second working state (right position), the oil inlet port P and the second working oil
- the port B communicates
- the oil return port T communicates with the first working oil port A
- the third working state (median position)
- the oil inlet port P, the first working oil port A, the second working oil port B and the oil return port T All are connected.
- the first optional oil outlet of the second reversing valve 8 is connected to the first oil port of the water washing motor 9, the second optional oil outlet of the second switching valve 8 is connected to the oil tank, and the second oil of the washing motor 9
- the second reversing valve 8 is preferably a two-position three-way valve, that is, the second reversing valve 8 has two working states, in the first working state (upper position), the second reversing direction
- the oil inlet of the valve 8 is in communication with the second optional oil outlet, the first optional oil outlet is cut off, and in the second working state (lower position), the oil inlet of the second switching valve 8 is first selected
- the oil ports are connected, and the second optional oil outlet is cut off.
- the main oil pump 1 supplies the pressure oil.
- the third reversing valve 4 is controlled to be in the closed state, the cooling motor 3 is operated, the auxiliary hydraulic system has the cooling function; if the first reversing valve 6 is controlled to be in the left or right position The agitating motor 7 rotates forward or reverse, and the auxiliary hydraulic system also has a stirring function; if the second reversing valve 8 is controlled to be in the lower position, the washing motor 9 operates, and the auxiliary hydraulic system also has a washing function; that is, the auxiliary hydraulic system can simultaneously have cooling , stirring and washing functions.
- the auxiliary hydraulic system can have both the agitation and the water washing function. If the third reversing valve 4 is controlled to be in the open state, the first reversing valve 6 is in the left or right position, and the second reversing valve 8 is in the upper position. At this time, only the agitating motor is operated in each motor, and the auxiliary hydraulic system only has Stirring function.
- auxiliary hydraulic system of the above embodiment may also perform at least one optimization as follows:
- the first reversing valve 6, the second reversing valve 8 and the third reversing valve 4 each adopt a solenoid valve, as shown in FIG. 2, so that the electromagnetic coil DT1 of the third reversing valve 4 can be controlled first.
- the electromagnetic coils DT2 and DT3 of the reversing valve 6 and the electromagnetic coil DT4 of the second reversing valve 8 are in a de-energized state to change the working position of each of the reversing valves, and the control is convenient and the operation is simple.
- a first overflow valve 10 may be connected in parallel to the washing motor 9, that is, the oil inlet of the first relief valve 10 is connected to the washing motor 9
- the first port of the first relief valve 10 is connected to the second port of the water washing motor 9 (ie, connected to the oil tank); in order to protect the cooling motor 3, the cooling motor 3 is prevented from being damaged due to excessive oil pressure.
- a second relief valve 5 can be connected in parallel with the cooling motor 3, that is, the oil inlet of the second relief valve 5 is connected to the first port of the cooling motor 3, and the overflow port of the second relief valve 5 is connected to the cooling port.
- the second oil port of the motor 3 in order to prevent the main oil pump 1 from being damaged due to excessive pressure when a certain corresponding overflow valve is damaged and blocked, and improving the service life of the main oil pump 1, the main oil pump 1 may be equipped with a third overflow
- the valve 2 the oil inlet of the third relief valve 2 is connected to the oil outlet of the main oil pump 1, and the overflow port of the third relief valve 2 is connected to the oil tank.
- the cooling motor 3, the agitation motor 7 and the water washing motor 9 and the corresponding reversing valve are sequentially disposed on the oil passage of the main oil pump 1 to the oil passage of the oil tank, but in other embodiments, The order of installation of the above parts can be reversed, for example, the washing motor 9 can be And the second reversing valve 8 is disposed between the oil inlet of the first reversing valve 6 and the second port of the cooling motor 3, that is, the oil inlet of the second reversing valve 8 is connected to the second of the cooling motor 3
- the oil port, the second port of the washing motor 9 and the second optional oil port of the second reversing valve 8 are connected to the oil inlet P of the first reversing valve 6, so that the corresponding function of the present invention can also be realized. .
- the auxiliary hydraulic system may have a stirring, water washing and cooling functions, but in other embodiments, only the stirring and water washing functions may be provided, that is, the cooling motor 3 and the third commutation are omitted.
- the valve 4 thus also enables the corresponding function of the invention.
- the first reversing valve 6 preferably has a median function of an H-type three-position four-way valve, but in other embodiments, the median function can also be an M-type three.
- the four-way valve further, can also adopt other types of reversing valves, as long as the forward and reverse rotation of the agitating motor can be realized (ie, in the first working state, the P port is connected to the A port, the T port is connected to the B port, In the second working state, the P port is connected to the B port, and the T port is connected to the A port.
- the second reversing valve 8 is preferably a two-position three-way valve, but in other embodiments, other forms may be adopted as long as the oil inlet can be selectively connected to the first thereof.
- FIG. 1 Another embodiment of the present invention also provide a concrete pumping apparatus, such as a concrete pump truck, which is provided with the auxiliary hydraulic system described in the above embodiments. Since the above-mentioned auxiliary hydraulic system has the above technical effects, the concrete pumping device should also have corresponding technical effects, and the specific implementation process of the corresponding part is similar to the above embodiment, and the specific implementation process of other parts can be referred to the prior art. The relevant description is not repeated here.
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Abstract
An auxiliary hydraulic system and a concrete pumping device. The auxiliary hydraulic system comprises a main oil pump (1), a stirring motor (7), a water-cleaning motor (9), a first reversing valve (6), and a second reversing valve (8). An oil inlet of the main oil pump (1) is connected to an oil tank, an oil outlet of the main oil pump (1) is connected to an oil inlet (P) of the first reversing valve (6), a first working oil port (A) and a second working oil port (B) of the first reversing valve (6) are connected to two oil ports of the stirring motor (7) respectively, an oil return port of the first reversing valve (6) is connected to an oil inlet of the second reversing valve (8), a first optional oil outlet and a second optional oil outlet of the second reversing valve (8) are connected to a first oil port of the water-cleaning motor (9) and the oil tank respectively, and a second oil port of the water-cleaning motor (9) is connected to the oil tank. The auxiliary hydraulic system can achieve synchronization of a stirring operation and a water-cleaning operation. The concrete pumping device is provided with the auxiliary hydraulic system.
Description
本申请要求于2013年9月24日提交中国专利局、申请号为201320589298.5、名称为“辅助液压***及混凝土泵送设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。The present application claims priority to Chinese Patent Application No. 201320589298.5, entitled "Auxiliary Hydraulic System and Concrete Pumping Equipment", filed on September 24, 2013, the entire contents of which is incorporated herein by reference. .
本发明涉及辅助液压***技术领域，特别涉及一种辅助液压***及混凝土泵送设备。The invention relates to the technical field of auxiliary hydraulic systems, in particular to an auxiliary hydraulic system and a concrete pumping device.
工程机械的液压***一般分为主液压***和辅助液压***，其中，辅助液压***主要完成液压油冷却等辅助工作，例如，混凝土泵送设备的辅助液压***主要完成冷却、搅拌、水洗等工作，目前，该辅助液压***的集成度较高，一般在一个独立液压回路中能够实现冷却、搅拌和水洗等工作。The hydraulic system of the construction machinery is generally divided into a main hydraulic system and an auxiliary hydraulic system. Among them, the auxiliary hydraulic system mainly performs auxiliary work such as hydraulic oil cooling. For example, the auxiliary hydraulic system of the concrete pumping equipment mainly performs cooling, stirring, washing, and the like. At present, the auxiliary hydraulic system has a high degree of integration, and generally can perform cooling, stirring and water washing in an independent hydraulic circuit.
如图1所示，现有的用于混凝土泵送设备的辅助液压***包括主油泵1'、冷却马达2'、换向阀3'、溢流阀4'、换向阀5'、溢流阀6'、换向阀7'、搅拌马达8'、截止阀9'、水洗马达10'和溢流阀11'。其中，通过改变换向阀3'的状态，可以控制冷却马达2'的动作，以选择是否开启冷却功能；通过改变换向阀5'的状态，可以控制压力油的供应方向，以选择开启搅拌功能或者水洗功能；换向阀7'用于控制搅拌马达8'的正反转；水洗马达10'入口的截止阀9'用于在水洗马达10'不工作时关闭，以防止水洗马达10'的两端产生压差而反转；溢流阀4'、6'和11'分别用于保护冷却马达2'、搅拌马达8'和水洗马达10'。As shown in Fig. 1, the existing auxiliary hydraulic system for concrete pumping equipment includes a main oil pump 1', a cooling motor 2', a reversing valve 3', a relief valve 4', a reversing valve 5', and an overflow. Valve 6', reversing valve 7', agitating motor 8', shut-off valve 9', water washing motor 10' and relief valve 11'. Wherein, by changing the state of the reversing valve 3', the action of the cooling motor 2' can be controlled to select whether to turn on the cooling function; by changing the state of the reversing valve 5', the supply direction of the pressurized oil can be controlled to select to start stirring. Function or water washing function; the reversing valve 7' is used to control the forward and reverse rotation of the agitating motor 8'; the shut-off valve 9' of the inlet of the washing motor 10' is used to close when the washing motor 10' is not working to prevent the washing motor 10' The two ends generate a pressure difference and are reversed; the relief valves 4', 6' and 11' are used to protect the cooling motor 2', the agitation motor 8' and the water washing motor 10', respectively.
上述方案中，搅拌功能和水洗功能无法同时进行；另外，需在水洗马达的入口处设置截止阀，增加了成本；另外，若某一马达及其对应溢流阀损坏堵死时，主油泵容易损坏。
In the above solution, the stirring function and the washing function cannot be performed simultaneously; in addition, a shut-off valve is required at the inlet of the washing motor to increase the cost; in addition, if a motor and its corresponding relief valve are damaged and blocked, the main oil pump is easy. damage.
因此，如何针对现有的辅助液压***进行改进，以进一步适应使用需要，是本领域技术人员亟待解决的技术问题。Therefore, how to improve the existing auxiliary hydraulic system to further meet the needs of use is a technical problem to be solved by those skilled in the art.
发明内容Summary of the invention
有鉴于此，本发明的目的之一在于提供一种辅助液压***，使水洗功能和搅拌功能能够同时进行。本发明的另一目的在于提供一种混凝土泵送设备。In view of the above, it is an object of the present invention to provide an auxiliary hydraulic system that enables the water washing function and the stirring function to be performed simultaneously. Another object of the present invention is to provide a concrete pumping apparatus.
具体而言，本发明的辅助液压***包括主油泵、搅拌马达、水洗马达、第一换向阀和第二换向阀，其中：所述主油泵的吸油口接于油箱，所述主油泵的出油口接于所述第一换向阀的进油口，所述第一换向阀的第一工作油口和第二工作油口分别接于所述搅拌马达的两个油口，所述第一换向阀的回油口接于所述第二换向阀的进油口，所述第二换向阀的第一可选出油口和第二可选出油口分别接于所述水洗马达的第一油口和油箱，所述水洗马达的第二油口接于油箱；或者，所述主油泵的吸油口接于油箱，所述主油泵的出油口接于所述第二换向阀的进油口，所述第二换向阀的第一可选出油口和第二可选出油口分别接于所述水洗马达的第一油口和所述第一换向阀的进油口，所述水洗马达的第二油口接于所述第一换向阀的进油口，所述第一换向阀的第一工作油口和第二工作油口分别接于所述搅拌马达的两个油口，所述第一换向阀的回油口接于油箱。Specifically, the auxiliary hydraulic system of the present invention includes a main oil pump, a stirring motor, a water washing motor, a first reversing valve and a second reversing valve, wherein: the oil suction port of the main oil pump is connected to the oil tank, and the main oil pump The oil outlet is connected to the oil inlet of the first directional control valve, and the first working oil port and the second working oil port of the first directional control valve are respectively connected to the two oil ports of the stirring motor. The oil return port of the first reversing valve is connected to the oil inlet of the second reversing valve, and the first optional oil outlet and the second optional oil outlet of the second reversing valve are respectively connected to a first oil port of the water washing motor and a fuel tank, wherein the second oil port of the water washing motor is connected to the oil tank; or the oil suction port of the main oil pump is connected to the oil tank, and the oil outlet of the main oil pump is connected to the oil tank An oil inlet of the second reversing valve, the first selectable oil outlet and the second selectable oil outlet of the second reversing valve are respectively connected to the first oil port of the water washing motor and the first An oil inlet of the reversing valve, a second port of the water washing motor is connected to an oil inlet of the first reversing valve, and a first working port of the first reversing valve A second actuator port respectively connected to the two ports of the stirring motor, the first switching valve of the oil return port connected to the tank.
进一步地，所述第一换向阀为中位机能为M型或者H型的三位四通阀。Further, the first reversing valve is a three-position four-way valve with a median function of M type or H type.
进一步地，所述第二换向阀为两位三通阀。Further, the second reversing valve is a two-position three-way valve.
进一步地，所述辅助液压***还包括第一溢流阀，所述第一溢流阀的进油口接于所述水洗马达的第一油口，所述第一溢流阀的溢流口接于所述水洗马达的第二油口。Further, the auxiliary hydraulic system further includes a first relief valve, the oil inlet of the first relief valve is connected to the first port of the water washing motor, and the overflow port of the first relief valve Connected to the second port of the water washing motor.
进一步地，所述辅助液压***还包括设置在所述主油泵的出油口和所述第一换向阀的进油口之间的冷却马达和第三换向阀；所述冷却马达的第一油口接于所述主油泵的出油口，所述冷却马达的第二油口接于所述第一换向阀的进油口；所述第三换向阀为开关阀，且其两个油口分别接于所述
冷却马达的第一油口和第二油口；或者，所述辅助液压***还包括设置在所述主油泵的出油口和所述第二换向阀的进油口之间的冷却马达和第三换向阀；所述冷却马达的第一油口接于所述主油泵的出油口，所述冷却马达的第二油口接于所述第二换向阀的进油口；所述第三换向阀为开关阀，且其两个油口分别接于所述冷却马达的第一油口和第二油口。Further, the auxiliary hydraulic system further includes a cooling motor and a third reversing valve disposed between the oil outlet of the main oil pump and the oil inlet of the first reversing valve; An oil port is connected to an oil outlet of the main oil pump, a second oil port of the cooling motor is connected to an oil inlet of the first switching valve; the third switching valve is an on-off valve, and Two ports are respectively connected to the
Cooling the first port and the second port of the motor; or the auxiliary hydraulic system further includes a cooling motor disposed between the oil outlet of the main oil pump and the oil inlet of the second reversing valve a third directional control valve; a first oil port of the cooling motor is connected to an oil outlet of the main oil pump, and a second oil port of the cooling motor is connected to an oil inlet of the second directional control valve; The third reversing valve is an on-off valve, and the two ports thereof are respectively connected to the first port and the second port of the cooling motor.
进一步地，所述辅助液压***还包括第二溢流阀，所述第二溢流阀的进油口接于所述冷却马达的第一油口，所述第二溢流阀的溢流口接于所述冷却马达的第二油口。Further, the auxiliary hydraulic system further includes a second relief valve, the oil inlet of the second relief valve is connected to the first port of the cooling motor, and the overflow port of the second relief valve Connected to the second port of the cooling motor.
进一步地，各换向阀均为电磁阀。Further, each of the reversing valves is a solenoid valve.
进一步地，所述辅助液压***还包括第三溢流阀，所述第三溢流阀的进油口接于所述主油泵的出油口，所述第三溢流阀的溢流口接于油箱。Further, the auxiliary hydraulic system further includes a third relief valve, an oil inlet of the third relief valve is connected to an oil outlet of the main oil pump, and an overflow port of the third relief valve is connected In the fuel tank.
本发明的混凝土泵送设备设置上述任一项所述的辅助液压***。The concrete pumping apparatus of the present invention is provided with the auxiliary hydraulic system according to any one of the above.
进一步地，该混凝土泵送设备为混凝土泵车。Further, the concrete pumping device is a concrete pump truck.
采用本发明的辅助液压***时，通过控制第二换向阀的状态，即可控制压力油依次经过搅拌马达和水洗马达或者依次经过水洗马达和搅拌马达，实现搅拌动作和水洗动作的同时进行。When the auxiliary hydraulic system of the present invention is used, by controlling the state of the second switching valve, it is possible to control the pressure oil to pass through the agitating motor and the water washing motor in sequence or sequentially through the water washing motor and the agitating motor to realize the stirring operation and the water washing operation.
在进一步的一种方案中，第一换向阀采用中位机能为M型或者H型的三位四通阀，这样能够实现搅拌马达和水洗马达的其中一个单独工作或者两个同时工作。In a further aspect, the first reversing valve uses a three-position four-way valve with a median function of M or H, which enables one or both of the agitator motor and the water washing motor to work simultaneously.
在进一步的一种方案中，辅助液压***还包括冷却马达和第三换向阀，这样能够实现三个马达的其中一个单独工作或者其中两个同时工作或者三个同时工作。In a further aspect, the auxiliary hydraulic system further includes a cooling motor and a third reversing valve such that one of the three motors can work alone or two of them can operate simultaneously or three simultaneously.
在进一步的一种方案中，主油泵的出油口设置有第三溢流阀，这样能够避免主油泵在某个马达及其对应溢流阀损坏堵死时因压力过大而损坏，提高主油泵的使用寿命。In a further solution, the oil outlet of the main oil pump is provided with a third overflow valve, which can prevent the main oil pump from being damaged due to excessive pressure when a certain motor and its corresponding overflow valve are damaged and blocked, thereby improving the main The service life of the oil pump.
本发明的混凝土泵送设备设置有上述的辅助液压***，由于上述的辅助液压***具有上述技术效果，因而，该混凝土泵送设备也具有相应的技术效果。The concrete pumping apparatus of the present invention is provided with the above-described auxiliary hydraulic system. Since the above-mentioned auxiliary hydraulic system has the above technical effects, the concrete pumping apparatus also has a corresponding technical effect.
图1为现有的一种用于混凝土泵送设备的辅助液压***的原理示意图；1 is a schematic view showing the principle of an auxiliary hydraulic system for a concrete pumping device;
图2为本发明实施例提供的一种辅助液压***的原理示意图。FIG. 2 is a schematic diagram of the principle of an auxiliary hydraulic system according to an embodiment of the present invention.
应当指出，本部分中对具体结构的描述及描述顺序仅是对具体实施例的说明，不应视为对本发明的保护范围有任何限制作用。此外，在不冲突的情形下，本部分中的实施例以及实施例中的特征可以相互组合。It should be noted that the description of the specific structures in this section and the description of the embodiments are merely illustrative of specific embodiments and should not be construed as limiting the scope of the invention. Further, the embodiments in this section and the features in the embodiments may be combined with each other without conflict.
请参考图2，下面将结合附图对本发明实施例作详细说明。Referring to FIG. 2, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
如图2所示，该实施例的辅助液压***包括主油泵1、冷却马达3、搅拌马达7、水洗马达9、第一换向阀6、第二换向阀8和第三换向阀4。As shown in FIG. 2, the auxiliary hydraulic system of this embodiment includes a main oil pump 1, a cooling motor 3, a stirring motor 7, a water washing motor 9, a first reversing valve 6, a second reversing valve 8, and a third reversing valve 4. .
其中，主油泵1的进油口接于油箱，主油泵1的出油口接于冷却马达3的进油口，冷却马达3的出油口接于第一换向阀6的进油口P；第三换向阀4为开关阀，优选地，在本实施例中，第三换向阀4为两位两通阀，第三换向阀4的两个油口分别接于冷却马达3的出油口和进油口。Wherein, the oil inlet of the main oil pump 1 is connected to the oil tank, the oil outlet of the main oil pump 1 is connected to the oil inlet of the cooling motor 3, and the oil outlet of the cooling motor 3 is connected to the oil inlet of the first reversing valve 6 The third reversing valve 4 is an on-off valve. Preferably, in the embodiment, the third reversing valve 4 is a two-position two-way valve, and the two ports of the third reversing valve 4 are respectively connected to the cooling motor 3 The oil outlet and the oil inlet.
第一换向阀6的第一工作油口A和第二工作油口B分别接于搅拌马达7的两个油口，第一换向阀6的回油口T接于第二换向阀8的进油口；在本实施例中，第一换向阀6优选中位机能为H型的三位四通阀，即第一换向阀6具有三种工作状态，在第一工作状态(左位)，进油口P与第一工作油口A相通，回油口T与第二工作油口B相通，在第二工作状态(右位)，进油口P与第二工作油口B相通，回油口T与第一工作油口A相通，在第三工作状态(中位)，进油口P、第一工作油口A、第二工作油口B和回油口T均相通。The first working port A and the second working port B of the first reversing valve 6 are respectively connected to the two ports of the agitating motor 7, and the oil return port T of the first reversing valve 6 is connected to the second reversing valve In the present embodiment, the first reversing valve 6 is preferably a three-position four-way valve of the H-type, that is, the first reversing valve 6 has three working states, in the first working state. (Left position), the oil inlet port P communicates with the first working oil port A, the oil return port T communicates with the second working oil port B, and in the second working state (right position), the oil inlet port P and the second working oil The port B communicates, the oil return port T communicates with the first working oil port A, and in the third working state (median position), the oil inlet port P, the first working oil port A, the second working oil port B and the oil return port T All are connected.
第二换向阀8的第一可选出油口接于水洗马达9的第一油口，第二换向阀8的第二可选出油口接于油箱，水洗马达9的第二油口接于油箱；在本实施例中，第二换向阀8优选两位三通阀，即第二换向阀8具有两种工作状态，在第一工作状态(上位)，第二换向阀8的进油口与第二可选出油口相通，第一可选出油口截止，在第二工作状态(下位)，第二换向阀8的进油口与第一可选出油口相通，第二可选出油口截止。
The first optional oil outlet of the second reversing valve 8 is connected to the first oil port of the water washing motor 9, the second optional oil outlet of the second switching valve 8 is connected to the oil tank, and the second oil of the washing motor 9 In the present embodiment, the second reversing valve 8 is preferably a two-position three-way valve, that is, the second reversing valve 8 has two working states, in the first working state (upper position), the second reversing direction The oil inlet of the valve 8 is in communication with the second optional oil outlet, the first optional oil outlet is cut off, and in the second working state (lower position), the oil inlet of the second switching valve 8 is first selected The oil ports are connected, and the second optional oil outlet is cut off.
在工作过程中，主油泵1供应压力油，若控制第三换向阀4处于关闭状态，冷却马达3动作，辅助液压***具有冷却功能；若控制第一换向阀6处于左位或者右位，搅拌马达7正转或者反转，辅助液压***还具有搅拌功能；若控制第二换向阀8处于下位，水洗马达9动作，辅助液压***还具有水洗功能；即辅助液压***可以同时具有冷却、搅拌和水洗功能。若控制第三换向阀4处于开通状态，第一换向阀6处于左位或者右位，第二换向阀8处于下位，辅助液压***可以同时具有搅拌和水洗功能。若控制第三换向阀4处于开通状态，第一换向阀6处于左位或者右位，第二换向阀8处于上位，此时，各马达中仅搅拌马达动作，辅助液压***仅具有搅拌功能。依次类推，可以得出，通过控制各换向阀的状态，能够使三个马达其中一个单独工作或者其中两个同时工作或者三个同时工作，从而使辅助液压***满足各种需要。In the working process, the main oil pump 1 supplies the pressure oil. If the third reversing valve 4 is controlled to be in the closed state, the cooling motor 3 is operated, the auxiliary hydraulic system has the cooling function; if the first reversing valve 6 is controlled to be in the left or right position The agitating motor 7 rotates forward or reverse, and the auxiliary hydraulic system also has a stirring function; if the second reversing valve 8 is controlled to be in the lower position, the washing motor 9 operates, and the auxiliary hydraulic system also has a washing function; that is, the auxiliary hydraulic system can simultaneously have cooling , stirring and washing functions. If the third reversing valve 4 is controlled to be in the open state, the first reversing valve 6 is in the left or right position, and the second reversing valve 8 is in the lower position, the auxiliary hydraulic system can have both the agitation and the water washing function. If the third reversing valve 4 is controlled to be in the open state, the first reversing valve 6 is in the left or right position, and the second reversing valve 8 is in the upper position. At this time, only the agitating motor is operated in each motor, and the auxiliary hydraulic system only has Stirring function. By analogy, it can be concluded that by controlling the state of each of the reversing valves, one of the three motors can be operated alone or two of them can work simultaneously or three simultaneously, thereby enabling the auxiliary hydraulic system to meet various needs.
具体实施过程中，上述实施例的辅助液压***还可以作如下至少一种优化：In the specific implementation process, the auxiliary hydraulic system of the above embodiment may also perform at least one optimization as follows:
一、第一换向阀6、第二换向阀8和第三换向阀4均采用电磁阀，如图2所示，这样可以通过控制第三换向阀4的电磁线圈DT1、第一换向阀6的电磁线圈DT2和DT3、第二换向阀8的电磁线圈DT4的得失电状态，以改变各换向阀的工作位置，控制方便，操作简单。1. The first reversing valve 6, the second reversing valve 8 and the third reversing valve 4 each adopt a solenoid valve, as shown in FIG. 2, so that the electromagnetic coil DT1 of the third reversing valve 4 can be controlled first. The electromagnetic coils DT2 and DT3 of the reversing valve 6 and the electromagnetic coil DT4 of the second reversing valve 8 are in a de-energized state to change the working position of each of the reversing valves, and the control is convenient and the operation is simple.
二、为了保护水洗马达9，避免水洗马达9因油压过大而损坏，可以为水洗马达9并联一第一溢流阀10，即第一溢流阀10的进油口接于水洗马达9的第一油口，第一溢流阀10的溢流口接于水洗马达9的第二油口(即接于油箱)；为了保护冷却马达3，避免冷却马达3因油压过大而损坏，可以为冷却马达3并联一第二溢流阀5，即第二溢流阀5的进油口接于冷却马达3的第一油口，第二溢流阀5的溢流口接于冷却马达3第二油口；为了避免主油泵1在某个及其对应溢流阀损坏堵死时因压力过大而损坏，提高主油泵1的使用寿命，可以主油泵1配备一第三溢流阀2，第三溢流阀2的进油口接于主油泵1的出油口，第三溢流阀2的溢流口接于油箱。2. In order to protect the washing motor 9, to prevent the washing motor 9 from being damaged due to excessive oil pressure, a first overflow valve 10 may be connected in parallel to the washing motor 9, that is, the oil inlet of the first relief valve 10 is connected to the washing motor 9 The first port of the first relief valve 10 is connected to the second port of the water washing motor 9 (ie, connected to the oil tank); in order to protect the cooling motor 3, the cooling motor 3 is prevented from being damaged due to excessive oil pressure. A second relief valve 5 can be connected in parallel with the cooling motor 3, that is, the oil inlet of the second relief valve 5 is connected to the first port of the cooling motor 3, and the overflow port of the second relief valve 5 is connected to the cooling port. The second oil port of the motor 3; in order to prevent the main oil pump 1 from being damaged due to excessive pressure when a certain corresponding overflow valve is damaged and blocked, and improving the service life of the main oil pump 1, the main oil pump 1 may be equipped with a third overflow The valve 2, the oil inlet of the third relief valve 2 is connected to the oil outlet of the main oil pump 1, and the overflow port of the third relief valve 2 is connected to the oil tank.
需要说明的是，上述实施例中，冷却马达3、搅拌马达7和水洗马达9以及对应的换向阀依次设置在主油泵1的出油口至油箱的油路上，但在其他实施例中，上述各部分的安装顺序可以调换，例如，可以将水洗马达9
及第二换向阀8设置在第一换向阀6的进油口和冷却马达3的第二油口之间，即第二换向阀8的进油口接于冷却马达3的第二油口，水洗马达9的第二油口和第二换向阀8的第二可选出油口接于第一换向阀6的进油口P，如此设置也能实现本发明的相应功能。It should be noted that, in the above embodiment, the cooling motor 3, the agitation motor 7 and the water washing motor 9 and the corresponding reversing valve are sequentially disposed on the oil passage of the main oil pump 1 to the oil passage of the oil tank, but in other embodiments, The order of installation of the above parts can be reversed, for example, the washing motor 9 can be
And the second reversing valve 8 is disposed between the oil inlet of the first reversing valve 6 and the second port of the cooling motor 3, that is, the oil inlet of the second reversing valve 8 is connected to the second of the cooling motor 3 The oil port, the second port of the washing motor 9 and the second optional oil port of the second reversing valve 8 are connected to the oil inlet P of the first reversing valve 6, so that the corresponding function of the present invention can also be realized. .
需要说明的是，上述各种实施例中，辅助液压***可以具有搅拌、水洗和冷却功能，但在其他实施例中，也可以仅具有搅拌和水洗功能，即省略冷却马达3及第三换向阀4，如此也能实现本发明的相应功能。It should be noted that, in the above various embodiments, the auxiliary hydraulic system may have a stirring, water washing and cooling functions, but in other embodiments, only the stirring and water washing functions may be provided, that is, the cooling motor 3 and the third commutation are omitted. The valve 4 thus also enables the corresponding function of the invention.
需要说明的是，上述各种实施例中，第一换向阀6优选中位机能为H型的三位四通阀，但在其他实施例中，也可以采用中位机能为M型的三位四通阀，进一步地，还可以采用其他形式的换向阀，只要能够实现搅拌马达的正反转即可(即在第一工作状态，P口通A口，T口通B口，在第二工作状态，P口通B口，T口通A口)。另外，上述各种实施例中，第二换向阀8优选两位三通阀，但在其他实施例中，也可以采用其他形式，只要能够实现其进油口选择性地连通于其第一可选出油口或者第二可选出油口即可。It should be noted that, in the above various embodiments, the first reversing valve 6 preferably has a median function of an H-type three-position four-way valve, but in other embodiments, the median function can also be an M-type three. The four-way valve, further, can also adopt other types of reversing valves, as long as the forward and reverse rotation of the agitating motor can be realized (ie, in the first working state, the P port is connected to the A port, the T port is connected to the B port, In the second working state, the P port is connected to the B port, and the T port is connected to the A port. In addition, in the above various embodiments, the second reversing valve 8 is preferably a two-position three-way valve, but in other embodiments, other forms may be adopted as long as the oil inlet can be selectively connected to the first thereof. Optional oil outlet or second optional oil outlet.
本发明其他实施例还提供了一种混凝土泵送设备，如混凝土泵车，该混凝土泵送设备设置有上述实施例所述的辅助液压***。由于上述的辅助液压***具有上述技术效果，因此，该混凝土泵送设备也应具备相应的技术效果，其相应部分的具体实施过程与上述实施例类似，其他部分的具体实施过程可参见现有技术的相关描述，兹不赘述。Other embodiments of the present invention also provide a concrete pumping apparatus, such as a concrete pump truck, which is provided with the auxiliary hydraulic system described in the above embodiments. Since the above-mentioned auxiliary hydraulic system has the above technical effects, the concrete pumping device should also have corresponding technical effects, and the specific implementation process of the corresponding part is similar to the above embodiment, and the specific implementation process of other parts can be referred to the prior art. The relevant description is not repeated here.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.
Claims (10)
- 一种辅助液压***，其特征在于，包括主油泵(1)、搅拌马达(7)、水洗马达(9)、第一换向阀(6)和第二换向阀(8)，其中：An auxiliary hydraulic system characterized by comprising a main oil pump (1), a stirring motor (7), a water washing motor (9), a first reversing valve (6) and a second reversing valve (8), wherein:所述主油泵(1)的吸油口接于油箱，所述主油泵(1)的出油口接于所述第一换向阀(6)的进油口(P)，所述第一换向阀(6)的第一工作油口(A)和第二工作油口(B)分别接于所述搅拌马达(7)的两个油口，所述第一换向阀(6)的回油口(T)接于所述第二换向阀(8)的进油口，所述第二换向阀(8)的第一可选出油口和第二可选出油口分别接于所述水洗马达(9)的第一油口和油箱，所述水洗马达(9)的第二油口接于油箱；The oil suction port of the main oil pump (1) is connected to the oil tank, and the oil outlet of the main oil pump (1) is connected to the oil inlet (P) of the first switching valve (6), the first change a first working port (A) and a second working port (B) of the valve (6) are respectively connected to two ports of the agitating motor (7), the first reversing valve (6) The oil return port (T) is connected to the oil inlet of the second reversing valve (8), and the first optional oil outlet and the second optional oil outlet of the second reversing valve (8) respectively Connected to the first port of the water washing motor (9) and the oil tank, the second port of the water washing motor (9) is connected to the oil tank;或者，or,所述主油泵(1)的吸油口接于油箱，所述主油泵(1)的出油口接于所述第二换向阀(8)的进油口，所述第二换向阀(8)的第一可选出油口和第二可选出油口分别接于所述水洗马达(9)的第一油口和所述第一换向阀(6)的进油口(P)，所述水洗马达(9)的第二油口接于所述第一换向阀(6)的进油口(P)，所述第一换向阀(6)的第一工作油口(A)和第二工作油口(B)分别接于所述搅拌马达(7)的两个油口，所述第一换向阀(6)的回油口(T)接于油箱。The oil suction port of the main oil pump (1) is connected to the oil tank, the oil outlet of the main oil pump (1) is connected to the oil inlet of the second switching valve (8), and the second switching valve ( The first selectable oil outlet and the second selectable oil outlet of 8) are respectively connected to the first oil port of the water washing motor (9) and the oil inlet of the first switching valve (6) (P The second port of the water washing motor (9) is connected to the oil inlet (P) of the first reversing valve (6), and the first working port of the first reversing valve (6) (A) and the second working oil port (B) are respectively connected to the two oil ports of the stirring motor (7), and the oil return port (T) of the first switching valve (6) is connected to the oil tank.
- 如权利要求1所述的辅助液压***，其特征在于，所述第一换向阀(6)为中位机能为M型或者H型的三位四通阀。The auxiliary hydraulic system according to claim 1, wherein said first reversing valve (6) is a three-position four-way valve whose intermediate position can be M-type or H-type.
- 如权利要求1所述的辅助液压***，其特征在于，所述第二换向阀(8)为两位三通阀。The auxiliary hydraulic system of claim 1 wherein said second reversing valve (8) is a two-position three-way valve.
- 如权利要求1所述的辅助液压***，其特征在于，所述辅助液压***还包括第一溢流阀(10)，所述第一溢流阀(10)的进油口接于所述水洗马达(9)的第一油口，所述第一溢流阀(10)的溢流口接于所述水洗马达(9)的第二油口。The auxiliary hydraulic system according to claim 1, wherein said auxiliary hydraulic system further comprises a first relief valve (10), said oil inlet of said first relief valve (10) being connected to said water washing a first port of the motor (9), an overflow port of the first relief valve (10) is connected to a second port of the water washing motor (9).
- 如权利要求1至4任一项所述的辅助液压***，其特征在于，所述辅助液压***还包括设置在所述主油泵(1)的出油口和所述第一换向阀(6)的进油口之间的冷却马达(3)和第三换向阀(4)；所述冷却马达(3)的第一油口接于所述主油泵(1)的出油口，所述冷却马达(3)的第二油口 接于所述第一换向阀(6)的进油口；所述第三换向阀(4)为开关阀，且其两个油口分别接于所述冷却马达(3)的第一油口和第二油口；An auxiliary hydraulic system according to any one of claims 1 to 4, wherein said auxiliary hydraulic system further comprises an oil outlet provided in said main oil pump (1) and said first reversing valve (6) a cooling motor (3) between the oil inlets and a third switching valve (4); the first port of the cooling motor (3) is connected to the oil outlet of the main oil pump (1) The second port of the cooling motor (3) Connected to the oil inlet of the first reversing valve (6); the third reversing valve (4) is an on-off valve, and the two ports thereof are respectively connected to the first of the cooling motor (3) Oil port and second port;或者，or,所述辅助液压***还包括设置在所述主油泵(1)的出油口和所述第二换向阀(8)的进油口之间的冷却马达(3)和第三换向阀(4)；所述冷却马达(3)的第一油口接于所述主油泵(1)的出油口，所述冷却马达(3)的第二油口接于所述第二换向阀(8)的进油口；所述第三换向阀(4)为开关阀，且其两个油口分别接于所述冷却马达(3)的第一油口和第二油口。The auxiliary hydraulic system further includes a cooling motor (3) and a third reversing valve disposed between the oil outlet of the main oil pump (1) and the oil inlet of the second reversing valve (8) ( 4); a first port of the cooling motor (3) is connected to an oil outlet of the main oil pump (1), and a second port of the cooling motor (3) is connected to the second directional valve The oil inlet of (8); the third reversing valve (4) is an on-off valve, and the two ports thereof are respectively connected to the first port and the second port of the cooling motor (3).
- 如权利要求5所述的辅助液压***，其特征在于，所述辅助液压***还包括第二溢流阀(5)，所述第二溢流阀(5)的进油口接于所述冷却马达(3)的第一油口，所述第二溢流阀(5)的溢流口接于所述冷却马达(3)的第二油口。The auxiliary hydraulic system according to claim 5, wherein said auxiliary hydraulic system further comprises a second relief valve (5), said oil inlet of said second relief valve (5) being connected to said cooling The first port of the motor (3), the overflow port of the second relief valve (5) is connected to the second port of the cooling motor (3).
- 如权利要求5所述的辅助液压***，其特征在于，各换向阀均为电磁阀。The auxiliary hydraulic system of claim 5 wherein each of the reversing valves is a solenoid valve.
- 如权利要求1至4任一项所述的辅助液压***，其特征在于，所述辅助液压***还包括第三溢流阀(2)，所述第三溢流阀(2)的进油口接于所述主油泵(1)的出油口，所述第三溢流阀(2)的溢流口接于油箱。The auxiliary hydraulic system according to any one of claims 1 to 4, characterized in that the auxiliary hydraulic system further comprises a third relief valve (2), the oil inlet of the third relief valve (2) Connected to the oil outlet of the main oil pump (1), the overflow port of the third relief valve (2) is connected to the oil tank.
- 一种混凝土泵送设备，其特征在于，所述混凝土泵送设备设置有权利要求1至8任一项所述的辅助液压***。A concrete pumping apparatus characterized in that the concrete pumping apparatus is provided with the auxiliary hydraulic system according to any one of claims 1 to 8.
- 如权利要求9所述的混凝土泵送设备，其特征在于，所述混凝土泵送设备为混凝土泵车。 A concrete pumping apparatus according to claim 9, wherein said concrete pumping device is a concrete pump truck.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320589298.5 | 2013-09-24 | ||
| CN201320589298.5U CN203548393U (en) | 2013-09-24 | 2013-09-24 | Auxiliary hydraulic system and concrete pumping equipment |
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| Publication Number | Publication Date |
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| WO2015043377A1 true WO2015043377A1 (en) | 2015-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2014/086346 WO2015043377A1 (en) | 2013-09-24 | 2014-09-12 | Auxiliary hydraulic system and concrete pumping device |
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| Country | Link |
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| CN (1) | CN203548393U (en) |
| WO (1) | WO2015043377A1 (en) |
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| CN109911009A (en) * | 2019-04-24 | 2019-06-21 | 莱州亚通重型装备有限公司 | A kind of metal mine underground concrete mixer truck all hydraulic pressure steering-gear and method |
| CN110004930A (en) * | 2019-04-13 | 2019-07-12 | 湖南鹏翔星通汽车有限公司 | A kind of wet-spraying machine forearm pose_adjuster |
| CN110670451A (en) * | 2019-10-22 | 2020-01-10 | 柳工无锡路面机械有限公司 | Reversing valve group for open type vibration system of road roller |
| CN113737873A (en) * | 2021-09-07 | 2021-12-03 | 山东临工工程机械有限公司 | Auxiliary steering hydraulic circuit system of land leveler and steering operation method thereof |
| CN115415967A (en) * | 2022-10-12 | 2022-12-02 | 沈阳飞机工业（集团）有限公司 | Hydraulic turnover workbench for aircraft inlet |
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| CN203548393U (en) * | 2013-09-24 | 2014-04-16 | 三一汽车制造有限公司 | Auxiliary hydraulic system and concrete pumping equipment |
| CN203879825U (en) * | 2014-04-29 | 2014-10-15 | 三一汽车制造有限公司 | Cantilever crane rotation hydraulic system and concrete conveying pump device |
| CN104196771B (en) * | 2014-07-18 | 2016-08-24 | 燕山大学 | A kind of electrofluidic control device of anticreep restraint device |
| CN105298955A (en) * | 2015-11-13 | 2016-02-03 | 湖南三一路面机械有限公司 | Stirring and washing system and concrete machine |
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| CN203548393U (en) | 2014-04-16 |
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