CN111022436A - Hydraulic drive system and aerial working equipment - Google Patents
Hydraulic drive system and aerial working equipment Download PDFInfo
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- CN111022436A CN111022436A CN201911243163.1A CN201911243163A CN111022436A CN 111022436 A CN111022436 A CN 111022436A CN 201911243163 A CN201911243163 A CN 201911243163A CN 111022436 A CN111022436 A CN 111022436A
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- valve
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- collecting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
Abstract
The invention discloses a hydraulic driving system, which comprises a walking control valve capable of shunting and collecting flow, and a first hydraulic motor, a second hydraulic motor, a third hydraulic motor and a fourth hydraulic motor which are respectively used for driving corresponding wheels, wherein the first hydraulic motor, the second hydraulic motor, the third hydraulic motor and the fourth hydraulic motor are respectively connected with the walking control valve, and the forward and reverse rotation of the first hydraulic motor, the second hydraulic motor, the third hydraulic motor and the fourth hydraulic motor can be controlled by the walking control valve; the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor are respectively connected with the walking control valve through a first reversing valve, the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor are respectively connected with the walking control valve through a second reversing valve, and the switching of the two-wheel drive and the four-wheel drive is controlled through the reversing of the first reversing valve and the second reversing valve. The invention also discloses high-altitude operation equipment. The invention can realize the switching between four-wheel drive and two-wheel drive.
Description
Technical Field
The invention relates to an aerial work device, in particular to a hydraulic drive system, and further relates to aerial work equipment.
Background
The aerial work platform can be suitable for installation, maintenance and the like of aerial equipment in various industries, and provides a movable lifting platform for operators to quickly and safely solve aerial work. At present, the traditional aerial work platform products are mainly traction type products, vehicle-mounted products and the like, and most of the products rely on the action of external force. However, with the development of national economy, the demand of high-altitude operation platforms is increasing year by year in the rapid development of many industries in China, such as street lamps, high-rise buildings, electric power, mines, communities, enterprises and other construction industries.
The walking hydraulic system of the existing high-altitude operation equipment mainly comprises a walking control valve, a steering control valve, a hydraulic motor and a steering oil cylinder, wherein the hydraulic motor is controlled by the walking control valve to realize the functions of straight walking, crab walking and the like, and the steering oil cylinder is controlled by the steering control valve to realize steering; under the condition that the power of a hydraulic system is determined, the running speed range is limited, and due to the fact that the equipment is large in size and heavy in weight, a work place is very inconvenient to replace.
Accordingly, there is a need for a new hydraulic drive system that overcomes or alleviates the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a hydraulic drive system which can realize the switching between four-wheel drive and two-wheel drive and effectively improve the running speed and the transition efficiency.
In addition, the invention aims to provide the aerial work equipment, which can effectively improve the running speed and the working efficiency and reduce the energy consumption and the transition time.
In order to achieve the above object, a first aspect of the present invention provides a hydraulic drive system, including a travel control valve capable of branching and merging flows, and a first hydraulic motor, a second hydraulic motor, a third hydraulic motor, and a fourth hydraulic motor for driving corresponding wheels, respectively, the first hydraulic motor, the second hydraulic motor, the third hydraulic motor, and the fourth hydraulic motor being connected to the travel control valve, respectively, so as to be capable of controlling forward and reverse rotation of the first hydraulic motor, the second hydraulic motor, the third hydraulic motor, and the fourth hydraulic motor by the travel control valve; the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor are respectively connected with the walking control valve through a first reversing valve, and the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor are respectively connected with the walking control valve through a second reversing valve so as to control the switching of two-wheel drive and four-wheel drive through the reversing of the first reversing valve and the second reversing valve.
Preferably, the traveling control valve further comprises a third reversing valve, the traveling control valve comprises a first flow dividing and collecting valve connected with a first oil port of the traveling control valve and two second flow dividing and collecting valves connected with a second oil port of the traveling control valve, and a flushing valve connected with an oil tank is arranged between the first oil port and the second oil port of the traveling control valve; one of the flow dividing and collecting valves is connected with the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor through the first reversing valve, and the other flow dividing and collecting valve is connected with the first oil port of the first hydraulic motor and the second oil port of the third hydraulic motor; one of the second flow dividing and collecting valves is connected with the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor through the second reversing valve, and the other of the second flow dividing and collecting valves is connected with the second oil port of the first hydraulic motor and the first oil port of the third hydraulic motor; the third reversing valve comprises a first oil port connected with the first oil port of the walking control valve, a second oil port connected with the flow dividing oil port of the first flow dividing and collecting valve far away from the first reversing valve, and a third oil port connected with the flow collecting oil port of the first flow dividing and collecting valve.
Preferably, the traveling control valve further comprises a third reversing valve, the traveling control valve comprises two first flow dividing and collecting valves connected with the first oil ports of the traveling control valve and a second flow dividing and collecting valve connected with the second oil ports of the traveling control valve, and a flushing valve connected with the oil tank is arranged between the first oil ports and the second oil ports of the traveling control valve; one first flow dividing and collecting valve is connected with the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor through the first reversing valve, and the other first flow dividing and collecting valve is connected with the first oil port of the first hydraulic motor and the second oil port of the third hydraulic motor; one of the flow dividing and collecting valves is connected with the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor through the second reversing valve, and the other flow dividing and collecting valve is connected with the second oil port of the first hydraulic motor and the first oil port of the third hydraulic motor; the third reversing valve comprises a first oil port connected with a second oil port of the walking control valve, a second oil port connected with a flow dividing oil port of the second flow dividing and collecting valve, the flow dividing oil port is far away from the second reversing valve, and a third oil port connected with a flow collecting oil port of the second flow dividing and collecting valve.
Preferably, the walking control valve comprises two first flow dividing and collecting valves connected with a first oil port of the walking control valve and two second flow dividing and collecting valves connected with a second oil port of the walking control valve, and a flushing valve connected with an oil tank is arranged between the first oil port and the second oil port of the walking control valve; one first flow dividing and collecting valve is connected with the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor through the first reversing valve, and the other first flow dividing and collecting valve is connected with the first oil port of the first hydraulic motor and the second oil port of the third hydraulic motor; and one second flow dividing and collecting valve is respectively connected with the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor through the second reversing valve, and the other second flow dividing and collecting valve is respectively connected with the second oil port of the first hydraulic motor and the first oil port of the third hydraulic motor.
Preferably, the traveling control valve further comprises two third reversing valves, the traveling control valve comprises a first flow dividing and collecting valve connected with a first oil port of the traveling control valve and a second flow dividing and collecting valve connected with a second oil port of the traveling control valve, and a flushing valve connected with an oil tank is arranged between the first oil port and the second oil port of the traveling control valve; one of the flow dividing and collecting valves is connected with the first oil port of the second hydraulic motor and the second oil port of the fourth hydraulic motor through the first reversing valve, and the other flow dividing and collecting valve is connected with the first oil port of the first hydraulic motor and the second oil port of the third hydraulic motor; one of the flow dividing and collecting valves is connected with the second oil port of the second hydraulic motor and the first oil port of the fourth hydraulic motor through the second reversing valve, and the other flow dividing and collecting valve is connected with the second oil port of the first hydraulic motor and the first oil port of the third hydraulic motor; the third reversing valve comprises a first oil port connected with the first oil port of the walking control valve, a second oil port connected with the flow dividing oil port of the first flow dividing and collecting valve far away from the first reversing valve and a third oil port connected with the flow collecting oil port of the first flow dividing and collecting valve; the other third reversing valve comprises a first oil port connected with a second oil port of the walking control valve, a second oil port connected with a flow dividing oil port of the second flow dividing and collecting valve, the flow dividing oil port is far away from the second reversing valve, and a third oil port connected with a flow collecting oil port of the second flow dividing and collecting valve.
And the first oil port of the fourth reversing valve is connected to an oil path between the first reversing valve and the second hydraulic motor, the fourth hydraulic motor, the first hydraulic motor or the third hydraulic motor, or the first oil port of the fourth reversing valve is connected to an oil path between the second reversing valve and the second hydraulic motor, the fourth hydraulic motor, the first hydraulic motor or the third hydraulic motor, and the second oil port of the fourth reversing valve is connected to an oil return port of the walking control valve through a one-way valve.
Specifically, check valves are arranged between the second oil port of the fourth reversing valve and the flow dividing oil port of the first flow dividing and collecting valve and between the second oil port of the fourth reversing valve and the flow dividing oil port of the second flow dividing and collecting valve.
Specifically, an overflow valve is arranged between the flushing valve and an oil return port of the walking control valve.
Typically, the steering control valve comprises a plurality of fifth reversing valves, and each fifth reversing valve is connected with the corresponding steering cylinder through a double-hydraulic-control one-way valve so as to be capable of controlling the extension and retraction of a piston rod of the corresponding steering cylinder.
Preferably, the first flow dividing and collecting valve and the second flow dividing and collecting valve are connected with a throttle valve in parallel.
The invention provides high-altitude operation equipment in a second aspect, which comprises the hydraulic drive system in any one of the technical schemes in the first aspect.
Through the technical scheme, the invention has the following beneficial effects:
in the basic technical scheme of the invention, the second hydraulic motor and the fourth hydraulic motor are connected with the walking control valve through the first reversing valve and the second reversing valve, and the on-off of oil passages between the second hydraulic motor and the walking control valve and between the fourth hydraulic motor and the walking control valve can be controlled through the reversing of the first reversing valve and the second reversing valve, so that the switching between two-wheel drive and four-wheel drive can be realized.
Additional features and more prominent advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a hydraulic schematic diagram of a prior art aerial work machine travel hydraulic system;
fig. 2 is a hydraulic schematic of a hydraulic drive system in an embodiment of the present invention.
Description of the reference numerals
1 traveling control valve A first oil port of the traveling control valve
Second oil port of B walking control valve and oil return port of T walking control valve
11 a first flow dividing and collecting valve C1 a flow dividing port of the first flow dividing and collecting valve
C3 diversion port of second diversion and collection valve C4 collection port of second diversion and collection valve
13 flushing valve 14 overflow valve
21 first hydraulic motor a1 first hydraulic motor first port
B1 second port 22 of first hydraulic motor second hydraulic motor
First oil port A2 of the second hydraulic motor B2 of the second hydraulic motor
23 third hydraulic motor a3 first port of third hydraulic motor
B3 second port of third hydraulic motor 24 fourth hydraulic motor
First port of a4 fourth Hydraulic Motor B4 second port of fourth Hydraulic Motor
3 first direction changing valve 4 second direction changing valve
5 third direction valve D1 first port of third direction valve
D2 second port of the third direction valve D3 third port of the third direction valve
6 fourth direction valve D4 first port of fourth direction valve
D5 second port 7 steering control valve of fourth reversing valve
71 fifth reversing valve 72 double-hydraulic control one-way valve
8 steering oil cylinder
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Furthermore, the terms "first", "second", "third", "fourth", "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated, and therefore, the features defined as "first", "second", "third", "fourth", "fifth" may explicitly or implicitly include one or more of the features described.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, it should be noted that, after knowing the technical idea of the hydraulic connection relationship of the present invention, it is also possible for those skilled in the art to simply replace the oil passage or the valve, etc. to achieve the function of the hydraulic drive system of the present invention, and this also belongs to the protection scope of the present invention. The related hydraulic components, such as the directional control valve, the flow dividing and collecting valve, the flushing valve, the check valve, the overflow valve, the motor, the oil cylinder, the hydraulic pump, etc., are well known to those skilled in the art and are common components in the existing hydraulic systems, so that the hydraulic components will be described only briefly hereinafter, and the description will focus on the original hydraulic connection relationship of the hydraulic drive system of the present invention.
Fig. 1 shows a prior art hydraulic system for traveling of an aerial work machine, in which when hydraulic oil flows in from a first oil port a of a traveling control valve 1 during a traveling operation, the hydraulic oil is divided into four equal parts by a first flow dividing and collecting valve 11 to drive a first hydraulic motor 21, a second hydraulic motor 22, a third hydraulic motor 23 and a fourth hydraulic motor 24 to rotate simultaneously, so that corresponding wheels rotate in one direction, for example, each wheel rotates forward, so that the machine travels in one direction; similarly, when the hydraulic oil flows in from the second oil port B of the travel control valve 1, the corresponding wheel may be rotated in one direction as well, and the equipment travels in another direction opposite to the above-described operation with respect to the first oil port a, for example, each wheel is rotated backward; the steering control valve 2 is connected to a plurality of steering cylinders 100, and can drive corresponding wheels to steer by the steering cylinders 100. However, with hydraulic system power determination, the travel speed range is limited.
In general, the wheels may be divided into a left front wheel, a left rear wheel, a right front wheel and a right rear wheel, and each of the wheels is driven by one hydraulic motor, for example, the first hydraulic motor 21 corresponds to the left front wheel, the second hydraulic motor 22 corresponds to the left rear wheel, the third hydraulic motor 23 corresponds to the right front wheel and the fourth hydraulic motor 24 corresponds to the right rear wheel, or the first hydraulic motor 21 corresponds to the left rear wheel, the second hydraulic motor 22 corresponds to the left front wheel, the third hydraulic motor 23 corresponds to the right rear wheel and the fourth hydraulic motor 24 corresponds to the right front wheel, or the first hydraulic motor 21 corresponds to the right front wheel, the second hydraulic motor 22 corresponds to the right rear wheel, the third hydraulic motor 23 corresponds to the left front wheel and the fourth hydraulic motor 24 corresponds to the left rear wheel, or the first hydraulic motor 21 corresponds to the right rear wheel, the second hydraulic motor 22 corresponds to the right front wheel, the right front wheel, The third hydraulic motor 23 for the left rear wheel and the fourth hydraulic motor 24 for the left front wheel, etc.;
the hydraulic drive system of the invention is based on the walking hydraulic system of the prior art high-altitude operation machinery, a first reversing valve 3 and a second reversing valve 4 are arranged in a targeted manner, hydraulic oil flowing to a second hydraulic motor 22 and a fourth hydraulic motor 24 through a walking control valve 1 is controlled to be interrupted or conducted through reversing of the first reversing valve 3 and the second reversing valve 4, and switching between two-wheel drive and four-wheel drive can be realized.
As shown in fig. 2, the hydraulic drive system according to the basic embodiment of the present invention includes a travel control valve 1 capable of branching and combining flows, and a first hydraulic motor 21, a second hydraulic motor 22, a third hydraulic motor 23, and a fourth hydraulic motor 24 for driving corresponding wheels, respectively, wherein the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24 are connected to the travel control valve 1, respectively, so that the forward and reverse rotation of the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24 can be controlled by the travel control valve 1; the first oil port a2 of the second hydraulic motor 22 and the second oil port B4 of the fourth hydraulic motor 24 are respectively connected to the traveling control valve 1 through a first direction valve 3, and the second oil port B2 of the second hydraulic motor 22 and the first oil port a4 of the fourth hydraulic motor 24 are respectively connected to the traveling control valve 1 through a second direction valve 4, so that the switching between two-wheel drive and four-wheel drive can be controlled by the direction change of the first direction valve 3 and the second direction valve 4.
As is known, in actual manufacturing and use of hydraulic components such as hydraulic motors, an oil port of a hydraulic motor is fixed, that is, when hydraulic oil flows in from one oil port of the hydraulic motor, an output shaft of the hydraulic motor rotates in a certain direction, and when hydraulic oil flows in from another oil port of the hydraulic motor, the output shaft of the hydraulic motor rotates in a direction opposite to the above direction; therefore, in the embodiment of the present invention, when the hydraulic oil flows in through the first port a1 of the first hydraulic motor 21, the first port a2 of the second hydraulic motor 22, the first port A3 of the third hydraulic motor 23, or the first port a4 of the fourth hydraulic motor 24, the rotation directions of the output shafts of the first, second, third, and fourth hydraulic motors 21, 22, 23, and 24 are the same; similarly, when the hydraulic oil flows in through the second port B1 of the first hydraulic motor 21, the second port B2 of the second hydraulic motor 22, the second port B3 of the third hydraulic motor 23, or the second port B4 of the fourth hydraulic motor 24, the rotation directions of the output shafts of the first, second, third, and fourth hydraulic motors 21, 22, 23, and 24 are the same, and are opposite to the rotation direction of the output shaft related to the first port a1 of the first hydraulic motor 21.
In the basic embodiment, the first and second direction-changing valves 3 and 4 are added on the basis of the traveling hydraulic system of the aerial working machine in the prior art, so that the first and second direction-changing valves 3 and 4 are positioned on the oil passages between the second and fourth hydraulic motors 22 and 24 and the traveling control valve 1, and the on-off of the oil passages between the second and fourth hydraulic motors 22 and 24 and the traveling control valve 1 can be controlled; in the four-wheel drive operation, the four equal parts of the flow are respectively transmitted to the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 through the traveling control valve 1, so that the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 can drive the corresponding wheels to rotate at a constant speed; wherein the flow rate through the first direction valve 3 is divided into two portions, one portion is from the first port a2 of the second hydraulic motor 22 to drive the second hydraulic motor 22, and the other portion is from the second port B4 of the fourth hydraulic motor 24 to drive the fourth hydraulic motor 24, although, the second hydraulic motor 22 rotates in the opposite direction to the output shaft of the fourth hydraulic motor 24, it is known, however, to just be able to bring the corresponding wheels to roll in the same direction, for example, simultaneously rolling forwards, or simultaneously backward, that is, the rotational directions and rotational speeds of the output shafts of the first hydraulic motor 21 and the second hydraulic motor 22 are the same, the rotational directions and rotational speeds of the output shafts of the third hydraulic motor 23 and the fourth hydraulic motor 24 are the same, meanwhile, the output shafts of the second hydraulic motor 22 and the fourth hydraulic motor 24 rotate in opposite directions, but the rotating speeds of the two are the same; after the first reversing valve 3 and the second reversing valve 4 are controlled to reverse together, oil paths between the second hydraulic motor 22 and the fourth hydraulic motor 24 and the walking control valve 1 are interrupted, and the two-wheel drive and the four-wheel drive are switched conveniently.
In general, in the hydraulic driving and steering system according to the basic embodiment of the present invention, during the switching process between two-wheel drive and four-wheel drive, the total flow rate is changed from four hydraulic motors, such as the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24, to two hydraulic motors, such as the first hydraulic motor 21 and the third hydraulic motor 23, under the same flow rate, so that the traveling speed of the two-wheel drive can reach twice the traveling speed of the four-wheel drive, and the transition efficiency is improved; generally, four-wheel drive is used in case of climbing, heavy load or requiring low speed, ensuring torque and passing ability; the two-wheel drive is used under the conditions of flat running, small load or high speed requirement, the running speed and the transition efficiency are ensured, and the energy consumption is reduced to a certain extent.
In a specific embodiment, the traveling control valve 1 may include one first flow-splitting and collecting valve 11 and two second flow-splitting and collecting valves 12, the flow-collecting port C2 of the first flow-splitting and collecting valve 11 is connected to the first port a of the traveling control valve 1, the flow-collecting ports C4 of the two second flow-splitting and collecting valves 12 are both connected to the second port B of the traveling control valve 1, and the first port a and the second port B of the traveling control valve 1 are connected to a hydraulic power source, for example, a bidirectional fixed displacement hydraulic pump, that is, hydraulic oil is supplied through the first port a and the second port B of the traveling control valve 1, and the traveling directions of the equipment are opposite; the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 are connected in parallel with a throttle valve, so that when steering is performed, the flow on two sides of the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 can be balanced, the rotating speed of the wheels is stable, the flushing valve 13 is arranged between the first oil port A and the second oil port B of the walking control valve 1, and the flushing valve 13 is connected with an oil tank, so that the cooling and filtering effects can be improved; specifically, one branch port C1 of the first branch/merge valve 11 is connected to the first port a2 of the second hydraulic motor 22 and the second port B4 of the fourth hydraulic motor 24 through the first direction valve 3, and the other branch port C1 is connected to the first port a1 of the first hydraulic motor 21 and the second port B3 of the third hydraulic motor 23; one second flow dividing and collecting valve 12 is connected to the second port B2 of the second hydraulic motor 22 and the first port a4 of the fourth hydraulic motor 24 through the second reversing valve 4, respectively, and the other second flow dividing and collecting valve 12 is connected to the second port B1 of the first hydraulic motor 21 and the first port A3 of the third hydraulic motor 23, respectively; thus, when the hydraulic oil flows in from the first oil port a of the traveling control valve 1, the hydraulic oil is branched by the first flow dividing and collecting valve 11, and the hydraulic oil flowing through the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 is collected by the corresponding second flow dividing and collecting valve 12 and then flows back to the oil tank through the flushing valve 13; similarly, the hydraulic oil flowing from the second port B of the travel control valve 1 drives the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24 via the second flow dividing and collecting valve 12, and then flows back to the oil tank via the first flow dividing and collecting valve 11 and the flush valve 13, so that the flush valve 13 can assist oil return well; in addition, a third reversing valve 5 is also needed to be arranged, the first port D1 of the third reversing valve 5 is connected with the first port a of the traveling control valve 1, the second port D2 of the third reversing valve 5 is connected with the flow dividing port C1 of the first flow dividing and collecting valve 11 far away from the first reversing valve 3, the third port D3 of the third reversing valve 5 is connected with the flow collecting port C2 of the first flow dividing and collecting valve 11, when the second hydraulic motor 22 and the fourth hydraulic motor 24 are interrupted from the travel control valve 1 by controlling the first direction switching valve 3 and the second direction switching valve 4 to be switched, the first port D1 of the third direction valve 5 is communicated with the second port D2 thereof, so that the first flow dividing and collecting valve 11 can be prevented from being out of order, i.e. to prevent that the first hydraulic motor 21 and the third hydraulic motor 23 cannot be supplied with oil via the first flow-dividing collecting valve 11, in the above case, the hydraulic oil introduced from the first port a of the travel control valve 1 is supplied to the first hydraulic motor 41 and the third hydraulic motor 43 through the third selector valve 5.
The travel control valve 1 is not limited to the specific configuration shown in fig. 2, and may have various configurations. For example, the walking control valve 1 may include two first shunt/current collecting valves 11 and one second shunt/current collecting valve 12, or the walking control valve 1 may include two first shunt/current collecting valves 11 and two second shunt/current collecting valves 12, etc., or the walking control valve 1 may include one first shunt/current collecting valve 11 and one second shunt/current collecting valve 12, or other hydraulic valve groups capable of achieving equivalent functions.
Specifically, when the traveling control valve 1 includes two first flow-splitting/collecting valves 11 and one second flow-splitting/collecting valve 12, the flow-collecting ports C2 of the two first flow-splitting/collecting valves 11 are both connected to the first port a of the traveling control valve 1, the flow-collecting port C4 of the second flow-splitting/collecting valve 12 is connected to the second port B of the traveling control valve 1, and the first port a and the second port B of the traveling control valve 1 are connected to a hydraulic power source, for example, a bidirectional fixed-displacement hydraulic pump; the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 are connected with the throttle valve in parallel, so that when steering operation is performed, the flow on two sides of the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 can be balanced, the rotating speed of the wheels is stable, a flushing valve 13 is further arranged between the first oil port A and the second oil port B of the walking control valve 1, and the flushing valve 13 is connected with an oil tank, so that the cooling and filtering effects can be improved; specifically, the two branch ports C1 of one first branch and collection valve 11 are connected to the first port a2 of the second hydraulic motor 22 and the second port B4 of the fourth hydraulic motor 24 through the first reversing valve 3, respectively, and the two branch ports C1 of the other first branch and collection valve 11 are connected to the first port a1 of the first hydraulic motor 21 and the second port B3 of the third hydraulic motor 23, respectively; one branch port C3 of the second branch/flow-collecting valve 12 is connected to the second port B2 of the second hydraulic motor 22 and the first port a4 of the fourth hydraulic motor 24 through the second reversing valve 4, and the other branch port C3 of the second branch/flow-collecting valve 12 is connected to the second port B1 of the first hydraulic motor 21 and the first port A3 of the third hydraulic motor 23; in addition, a third reversing valve 5 is also needed to be arranged, the first port D1 of the third reversing valve 5 is connected with the second port B of the traveling control valve 1, the second port D2 of the third reversing valve 5 is connected with the flow dividing port C3 of the second flow dividing and collecting valve 12 far away from the second reversing valve 4, the third port D3 of the third reversing valve 5 is connected with the flow collecting port C4 of the second flow dividing and collecting valve 12, when the oil passages between the second and fourth hydraulic motors 22 and 24 and the travel control valve 1 are interrupted by the first and second direction changing valves 3 and 4, the first port D1 of the third direction valve 5 is communicated with the second port D2 thereof, so that the second flow dividing and collecting valve 12 can be prevented from being out of order, i.e. to prevent that the first hydraulic motor 21 and the third hydraulic motor 23 cannot be supplied with oil via the second combining flow dividing valve 12, in this case, the hydraulic oil that has flowed in from the second port B of the travel control valve 1 can be supplied to the first hydraulic motor 21 and the third hydraulic motor 23 through the third selector valve 5. That is, the structural forms of the first flow dividing and collecting valve 11 and the two second flow dividing and collecting valves 12 shown in fig. 2 are interchanged, so that the technical solution can be obtained.
When the walking control valve 1 comprises two first flow dividing and collecting valves 11 and two second flow dividing and collecting valves 12, in this specific embodiment, the third reversing valve 5 may not be provided, and the system structure is optimized; the collecting oil ports C2 of the two first flow-dividing and collecting valves 11 are connected to the first oil port a of the traveling control valve 1, the collecting oil ports C4 of the two second flow-dividing and collecting valves 12 are connected to the second oil port B of the traveling control valve 1, and the first oil port a and the second oil port B of the traveling control valve 1 are connected to a hydraulic power source, such as a bidirectional quantitative hydraulic pump; the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 are connected with the throttle valve in parallel, so that when steering operation is performed, the flow on the two sides of the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 can be balanced, a flushing valve 13 is arranged between the first oil port A and the second oil port B of the walking control valve 1, and the flushing valve 13 is connected with an oil tank, so that the cooling and filtering effects can be improved; specifically, the two branch ports C1 of one first branch/manifold valve 11 are connected to the first port a2 of the second hydraulic motor 22 and the second port B4 of the fourth hydraulic motor 24 through the first direction switch valve 3, respectively, and the two branch ports C1 of the other first branch/manifold valve 11 are connected to the first port a1 of the first hydraulic motor 21 and the second port B3 of the third hydraulic motor 23, respectively; the two branch ports C3 of one second branch flow and collection valve 12 are respectively connected with the second port B2 of the second hydraulic motor 22 and the first port a4 of the fourth hydraulic motor 24 through the second reversing valve 4, and the two branch ports C3 of the other second branch flow and collection valve 12 are respectively connected with the second port B1 of the first hydraulic motor 21 and the first port A3 of the third hydraulic motor 23; thus, when the hydraulic oil flows in from the first oil port a of the traveling control valve 1, the hydraulic oil is branched by the first flow dividing and collecting valve 11, and the hydraulic oil flowing through the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 is collected by the corresponding second flow dividing and collecting valve 12 and then flows back to the oil tank through the flushing valve 13; similarly, the hydraulic oil flowing from the second port B of the travel control valve 1 drives the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24 via the second flow dividing and collecting valve 12, and flows back to the oil tank via the first flow dividing and collecting valve 11 and the flush valve 13, and the flush valve 13 can assist the return of the oil well.
When the traveling control valve 1 comprises a first flow-dividing and flow-collecting valve 11 and a second flow-dividing and flow-collecting valve 12, the flow-collecting ports C2 of the first flow-dividing and flow-collecting valve 11 are both connected with the first port a of the traveling control valve 1, the flow-collecting ports C4 of the second flow-dividing and flow-collecting valve 12 are both connected with the second port B of the traveling control valve 1, and the first port a and the second port B of the traveling control valve 1 are connected with a hydraulic power source, such as a bidirectional quantitative hydraulic pump; the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 are connected with the throttle valve in parallel, so that when steering operation is performed, the flow on two sides of the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 can be balanced, the rotating speed of the wheels is stable, the flushing valve 13 can be arranged between the first oil port A and the second oil port B of the walking control valve 1, and the flushing valve 13 is connected with an oil tank, so that the cooling and filtering effects can be improved; specifically, one branch port C1 of the first branch/merge valve 11 is connected to the first port a2 of the second hydraulic motor 22 and the second port B4 of the fourth hydraulic motor 24 through the first direction valve 3, and the other branch port C1 is connected to the first port a1 of the first hydraulic motor 21 and the second port B3 of the third hydraulic motor 23; one branch port C3 of the second branch/flow-collecting valve 12 is connected to the second port B2 of the second hydraulic motor 22 and the first port a4 of the fourth hydraulic motor 24 through the second reversing valve 4, and the other branch port C3 of the second branch/flow-collecting valve 12 is connected to the second port B1 of the first hydraulic motor 21 and the first port A3 of the third hydraulic motor 23; thus, when the hydraulic oil flows in from the first oil port a of the traveling control valve 1, the hydraulic oil is branched by the first flow dividing and collecting valve 11, and the hydraulic oil flowing through the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 is collected by the second flow dividing and collecting valve 12 and then flows back to the oil tank through the flushing valve 13; similarly, the hydraulic oil flowing from the second port B of the travel control valve 1 drives the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23, and the fourth hydraulic motor 24 via the second flow dividing and collecting valve 12, and then flows back to the oil tank via the first flow dividing and collecting valve 11 and the flush valve 13, so that the flush valve 13 can assist oil return well; in addition, two third reversing valves 5 are also required to be provided, a first port D1 of one third reversing valve 5 is connected with the first port a of the traveling control valve 1, a second port D2 of the third reversing valve 5 is connected with the flow dividing port C1 of the first flow dividing and collecting valve 11, which is far away from the first reversing valve 3, a third port D3 of the third reversing valve 5 is connected with the flow collecting port C2 of the first flow dividing and collecting valve 11, a first port D1 of the other third reversing valve 5 is connected with the second port B of the traveling control valve 1, a second port D2 of the third reversing valve 5 is connected with the flow dividing port C3 of the second flow dividing and collecting valve 12, which is far away from the first reversing valve 3, and a third port D3 of the third reversing valve 5 is connected with the flow collecting port C4 of the second flow dividing and collecting valve 12; when the second hydraulic motor 22 and the fourth hydraulic motor 24 are interrupted from the travel control valve 1 by the first change valve 3 and the second change valve 4, the first port D1 of the third change valve 5 is communicated with the second port D2 thereof, and thus the first flow-dividing/collecting valve 11 or the second flow-dividing/collecting valve 12 can be prevented from failing, that is, the first hydraulic motor 21 and the third hydraulic motor 23 cannot be supplied with oil via the first flow-dividing/collecting valve 11 or the second flow-dividing/collecting valve 12, and in the above case, the hydraulic oil flowing from the first port a or the second port B of the travel control valve 1 can be supplied to the first hydraulic motor 21 and the third hydraulic motor 23 via the third change valve 5.
In addition, the flow can be controlled to selectively flow in from the first oil port a or the second oil port B of the walking control valve 1 by setting the bidirectional quantitative hydraulic pump between the first oil port a and the second oil port B of the walking control valve 1, and of course, other modes can be adopted to achieve the same effect, for example, the first oil port a and the second oil port B of the walking control valve 1 are both connected with a quantitative pump through a two-position three-way valve, and the flow can also be selectively flowed in from the first oil port a or the second oil port B of the walking control valve 1 by controlling the reversing of the two-position three-way valve.
An overflow valve 14 may be disposed between the flushing valve 13 and the oil tank, the auxiliary system is unloaded, and the overflow valve 14 may be connected to the oil tank through an oil return port T of the travel control valve 1 in order to simplify the structural design.
Further, a fourth direction valve 6 may be further provided, wherein the first port D4 of the fourth direction valve 6 is connected to an oil path between the first direction valve 3 and the second hydraulic motor 22, or connected to an oil path between the first direction valve 3 and the fourth hydraulic motor 24, or connected to an oil path between the second direction valve 4 and the second hydraulic motor 22, or connected to an oil path between the second direction valve 4 and the fourth hydraulic motor 24, and the second port D5 of the fourth direction valve 6 is connected to the oil return port T of the travel control valve 1 through a check valve. The fourth direction valve 6 may be a two-position two-way valve or other hydraulic valves capable of achieving the same function.
The second port D5 of the fourth direction valve 6 is further connected to the flow dividing port C1 of the first flow dividing and collecting valve 11 and the flow dividing port C3 of the second flow dividing and collecting valve 12, the second port D5 of the fourth direction valve 6 is connected to the flow dividing port C1 of the first flow dividing and collecting valve 11 in a one-way manner through a check valve, and the second port D5 of the sixth direction valve 8 is connected to the flow dividing port C3 of the second flow dividing and collecting valve 12 in a one-way manner through a check valve.
Generally, the aerial work machine has not only a mechanical traveling function but also a steering function, and for this purpose, a steering control valve 7 may be provided in the system, and the steering control valve 7 may be a control valve group composed of a plurality of fifth directional control valves 71, and each fifth directional control valve 71 is connected to the corresponding steering cylinder 8 through a double pilot operated check valve 72 so as to be capable of controlling the extension and retraction of the piston rod of the corresponding steering cylinder 8, and thus, can be used for controlling the steering of the corresponding wheel.
Referring to fig. 2, the hydraulic drive system according to the preferred embodiment of the present invention includes a travel control valve 1 capable of splitting and combining flow, a plurality of first hydraulic motors 21, second hydraulic motors 22, third hydraulic motors 23, and fourth hydraulic motors 24 for driving corresponding wheels, a steering control valve 7, a plurality of steering cylinders 8 connected to the respective wheels, wherein each seventh directional control valve 71 of the steering control valve 7 controls the corresponding steering cylinder 8 through a corresponding double pilot operated check valve 72 to drive the corresponding wheel to steer; a first port a2 of the second hydraulic motor 22 and a second port B4 of the fourth hydraulic motor 24 are respectively connected with the first directional control valve 3, a second port B2 of the second hydraulic motor 22 and a first port a4 of the fourth hydraulic motor 24 are respectively connected with the second directional control valve 4, the first directional control valve 3 is connected with one branch port C1 of the first branch flow and collection valve 11 of the traveling control valve 1, a first port a1 of the first hydraulic motor 21 and a second port B3 of the third hydraulic motor 23 are respectively connected with the other branch port C1 of the first branch flow and collection valve 11, the second directional control valve 4 is respectively connected with two branch ports C3 of one second branch flow and collection valve 12, a second port B1 of the first hydraulic motor 21 and a first port A3 of the third hydraulic motor 23 are respectively connected with two branch flow ports C3 of the other second branch flow and collection valve 12, the first port a2 of the first branch flow and collection valve 11 is connected with the first branch flow port C3552 of the traveling control valve 1, the collecting oil ports C4 of the two second flow dividing and collecting valves 12 are connected with the second oil ports B of the walking control valve 1, the third reversing valve 5 comprises a first oil port D1 connected with the first oil port A of the walking control valve 1, a second oil port D2 connected with the flow dividing oil port C1 of the first flow dividing and collecting valve 11, which is far away from the first reversing valve 3, and a third oil port D3 connected with the collecting oil port C2 of the first flow dividing and collecting valve 11, and the first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 are connected with a throttle valve in parallel; a first oil port D4 of the fourth reversing valve 6 is connected to an oil path between the second reversing valve 4 and the fourth hydraulic motor 24, a second oil port D5 of the fourth reversing valve 6 is connected to an oil return port T of the traveling control valve 1 through a check valve, check valves are arranged between a second oil port D5 of the fourth reversing valve 6 and the flow dividing oil port C1 of the first flow dividing and collecting valve 11 and the flow dividing oil port C3 of the second flow dividing and collecting valve 12, a flushing valve 13 connected with an oil tank is arranged between the first oil port a and the second oil port B of the traveling control valve 1, and the flushing valve 13 is connected to the oil return port T of the traveling control valve 1 through an overflow valve 14; for convenience of operation, the first reversing valve 3 and the second reversing valve 4 can adopt normally open type electric control reversing valves; when the four-wheel drive operation is carried out, hydraulic oil can be introduced from the first oil port A or the second oil port B of the walking control valve 1, and the functions of straight running, single-axle steering, double-axle steering, crab running and the like can be realized by controlling the steering control valve 2 through the first shunt and current collecting valve 11 and the second shunt and current collecting valve 12; when the first direction valve 3, the second direction valve 4, and the fourth direction valve 6 are switched together, the oil path between the traveling control valve 1 and the second hydraulic motor 22 and the fourth hydraulic motor 24 is cut off, and the four-wheel drive is switched to the two-wheel drive.
It should be noted that the first direction valve 3, the second direction valve 4, the third direction valve 5, the fourth direction valve 6, the fifth direction valve 71 and other direction valves may be controlled manually, mechanically, electrically, hydraulically, electro-hydraulically and the like, and are preferably electrically controlled direction valves for convenience of control and operation.
The aerial work equipment comprises the hydraulic drive system in any one of the technical schemes, so that at least all the advantages brought by the technical scheme of the embodiment of the hydraulic drive system are achieved.
After the hydraulic drive system is applied to the aerial working equipment, the four-wheel drive and the two-wheel drive can be switched, the maximum flow of a hydraulic power source of one equipment is usually determined, the running speed of the two-wheel drive can reach twice of that of the four-wheel drive under the same flow, or the same speed only needs to be half of the flow when the four-wheel drive is used under the two-wheel drive mode, the pressure loss of a pipeline can be effectively reduced through the reduction of the flow, the energy loss and the oil consumption can be reduced, the running speed and the working efficiency can be effectively improved, the transition time is reduced, and the first hydraulic motor 21, the second hydraulic motor 22, the third hydraulic motor 23 and the fourth hydraulic motor 24 can be double-speed hydraulic motors, so that the aerial working equipment has the four-gear speed regulation function.
The above technical solution is mainly described for aerial work equipment, however, it should be understood that the hydraulic drive and steering system of the present invention may also be applied to other equipment as long as it can be installed in the hydraulic system of other equipment to realize the function of switching between two-wheel drive and four-wheel drive.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (11)
1. The hydraulic drive system is characterized by comprising a walking control valve (1) capable of dividing and collecting flow, and a first hydraulic motor (21), a second hydraulic motor (22), a third hydraulic motor (23) and a fourth hydraulic motor (24) which are respectively used for driving corresponding wheels, wherein the first hydraulic motor (21), the second hydraulic motor (22), the third hydraulic motor (23) and the fourth hydraulic motor (24) are respectively connected with the walking control valve (1) so as to control the forward and reverse rotation of the first hydraulic motor (21), the second hydraulic motor (22), the third hydraulic motor (23) and the fourth hydraulic motor (24) through the walking control valve (1);
the first oil port (A2) of the second hydraulic motor (22) and the second oil port (B4) of the fourth hydraulic motor (24) are respectively connected with the walking control valve (1) through a first reversing valve (3), the second oil port (B2) of the second hydraulic motor (22) and the first oil port (A4) of the fourth hydraulic motor (24) are respectively connected with the walking control valve (1) through a second reversing valve (4), so that the two-wheel drive and four-wheel drive can be switched through the reversing control of the first reversing valve (3) and the second reversing valve (4).
2. The hydraulic drive system of claim 1, further comprising a third directional control valve (5), wherein the traveling control valve (1) comprises a first flow dividing and collecting valve (11) connected with the first oil port (A) of the traveling control valve and two second flow dividing and collecting valves (12) connected with the second oil port (B) of the traveling control valve, and a flushing valve (13) connected with an oil tank is arranged between the first oil port (A) and the second oil port (B) of the traveling control valve (1);
one splitting oil port (C1) of the first splitting and collecting valve (11) is respectively connected with a first oil port (A2) of the second hydraulic motor (22) and a second oil port (B4) of the fourth hydraulic motor (24) through the first reversing valve (3), and the other splitting oil port (C1) of the first splitting and collecting valve is respectively connected with a first oil port (A1) of the first hydraulic motor (21) and a second oil port (B3) of the third hydraulic motor (23); one of the second flow dividing and collecting valves (12) is connected with the second oil port (B2) of the second hydraulic motor (22) and the first oil port (A4) of the fourth hydraulic motor (24) through the second reversing valve (4), and the other of the second flow dividing and collecting valves (12) is connected with the second oil port (B1) of the first hydraulic motor (21) and the first oil port (A3) of the third hydraulic motor (23);
the third reversing valve (5) comprises a first oil port (D1) connected with the first oil port (A) of the walking control valve (1), a second oil port (D2) connected with a flow dividing oil port (C1) of the first flow dividing and collecting valve (11) far away from the first reversing valve (3), and a third oil port (D3) connected with a flow collecting oil port (C2) of the first flow dividing and collecting valve (11).
3. The hydraulic drive system of claim 1, further comprising a third directional control valve (5), wherein the traveling control valve (1) comprises two first flow dividing and collecting valves (11) connected with the first oil ports (A) of the traveling control valve and one second flow dividing and collecting valve (12) connected with the second oil ports (B), and a flushing valve (13) connected with an oil tank is arranged between the first oil ports (A) and the second oil ports (B) of the traveling control valve (1);
one first flow dividing and collecting valve (11) is respectively connected with a first oil port (A2) of the second hydraulic motor (22) and a second oil port (B4) of the fourth hydraulic motor (24) through the first reversing valve (3), and the other first flow dividing and collecting valve (11) is respectively connected with a first oil port (A1) of the first hydraulic motor (21) and a second oil port (B3) of the third hydraulic motor (23); one splitting oil port (C3) of the second splitting and collecting valve (12) is respectively connected with a second oil port (B2) of the second hydraulic motor (22) and a first oil port (A4) of the fourth hydraulic motor (24) through the second reversing valve (4), and the other splitting oil port (C3) is respectively connected with a second oil port (B1) of the first hydraulic motor (21) and a first oil port (A3) of the third hydraulic motor (23);
the third reversing valve (5) comprises a first oil port (D1) connected with the second oil port (B) of the walking control valve (1), a second oil port (D2) connected with a flow dividing oil port (C3) of the second flow dividing and collecting valve (12) far away from the second reversing valve (4), and a third oil port (D3) connected with a flow collecting oil port (C4) of the second flow dividing and collecting valve (12).
4. The hydraulic drive system according to claim 1, characterized in that the walking control valve (1) comprises two first flow dividing and collecting valves (11) connected with the first oil ports (A) thereof and two second flow dividing and collecting valves (12) connected with the second oil ports (B) thereof, and a flushing valve (13) connected with an oil tank is arranged between the first oil ports (A) and the second oil ports (B) of the walking control valve (1);
one first flow dividing and collecting valve (11) is respectively connected with a first oil port (A2) of the second hydraulic motor (22) and a second oil port (B4) of the fourth hydraulic motor (24) through the first reversing valve (3), and the other first flow dividing and collecting valve (11) is respectively connected with a first oil port (A1) of the first hydraulic motor (21) and a second oil port (B3) of the third hydraulic motor (23); one of the second flow dividing and collecting valves (12) is connected to the second port (B2) of the second hydraulic motor (22) and the first port (A4) of the fourth hydraulic motor (24) through the second direction valve (4), respectively, and the other of the second flow dividing and collecting valves (12) is connected to the second port (B1) of the first hydraulic motor (21) and the first port (A3) of the third hydraulic motor (23), respectively.
5. The hydraulic drive system of claim 1, further comprising two third directional valves (5), wherein the walking control valve (1) comprises a first flow dividing and collecting valve (11) connected with the first oil port (A) of the walking control valve and a second flow dividing and collecting valve (12) connected with the second oil port (B) of the walking control valve, and a flushing valve (13) connected with an oil tank is arranged between the first oil port (A) and the second oil port (B) of the walking control valve (1);
one splitting oil port (C1) of the first splitting and collecting valve (11) is respectively connected with a first oil port (A2) of the second hydraulic motor (22) and a second oil port (B4) of the fourth hydraulic motor (24) through the first reversing valve (3), and the other splitting oil port (C1) of the first splitting and collecting valve is respectively connected with a first oil port (A1) of the first hydraulic motor (21) and a second oil port (B3) of the third hydraulic motor (23); one splitting oil port (C3) of the second splitting and collecting valve (12) is respectively connected with a second oil port (B2) of the second hydraulic motor (22) and a first oil port (A4) of the fourth hydraulic motor (24) through the second reversing valve (4), and the other splitting oil port (C3) is respectively connected with a second oil port (B1) of the first hydraulic motor (21) and a first oil port (A3) of the third hydraulic motor (23);
the third reversing valve (5) comprises a first oil port (D1) connected with the first oil port (A) of the walking control valve (1), a second oil port (D2) connected with a flow dividing oil port (C1) of the first flow dividing and collecting valve (11) far away from the first reversing valve (3), and a third oil port (D3) connected with a flow collecting oil port (C2) of the first flow dividing and collecting valve (11); the other third reversing valve (5) comprises a first oil port (D1) connected with the second oil port (B) of the walking control valve (1), a second oil port (D2) connected with a flow dividing oil port (C3) of the second flow dividing and collecting valve (12) far away from the second reversing valve (4), and a third oil port (D3) connected with a flow collecting oil port (C4) of the second flow dividing and collecting valve (12).
6. The hydraulic drive system according to any one of claims 2 to 5, characterized by further comprising a fourth direction valve (6), wherein the first oil port (D4) of the fourth direction valve (6) is connected to the oil path between the first direction valve (3) and the second hydraulic motor (22) or the fourth hydraulic motor (24), or the first oil port (D4) of the fourth direction valve (6) is connected to the oil path between the second direction valve (4) and the second hydraulic motor (22) or the fourth hydraulic motor (24), and the second oil port (D5) of the fourth direction valve (6) is connected to the oil return port (T) of the travel control valve (1) through a check valve.
7. The hydraulic drive system according to claim 6, characterized in that a one-way valve is arranged between the second port (D5) of the fourth direction valve (6) and the flow dividing port (C1) of the first flow dividing and collecting valve (11) and the flow dividing port (C3) of the second flow dividing and collecting valve (12).
8. A hydraulic drive system according to any one of claims 2-5, characterized in that a spill valve (14) is arranged between the flushing valve (13) and the return opening (T) of the travel control valve (1).
9. A hydraulic drive system according to any one of claims 2 to 5, further comprising a steering control valve (7) and a plurality of steering cylinders (8) connected to each wheel and operable to control the steering of the corresponding wheel, said steering control valve (7) comprising a plurality of fifth direction changing valves (71), each of said fifth direction changing valves (71) being connected to the corresponding steering cylinder (8) via a double pilot operated check valve (72) to enable control of extension and retraction of the piston rod of the corresponding steering cylinder (8).
10. A hydraulic drive system according to claim 9, wherein the first and second flow dividing and collecting valves (11, 12) are each connected in parallel with a throttle valve.
11. An aerial work apparatus comprising a hydraulic drive system as claimed in any one of claims 1 to 10.
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| CN201911243163.1A CN111022436B (en) | 2019-12-06 | 2019-12-06 | Hydraulic drive system and aerial working equipment |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008082130A (en) * | 2006-09-29 | 2008-04-10 | Kubota Corp | Hydraulic system of backhoe |
| CN102582425A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Walking hydraulic control system and self-walking type engineering machinery utilizing same |
| CN103016431A (en) * | 2012-12-17 | 2013-04-03 | 莱恩农业装备有限公司 | Hydraulic system of full hydraulic seedling planting machine |
| CN203297177U (en) * | 2013-05-15 | 2013-11-20 | 湖南三一路面机械有限公司 | Hydraulic walking drive system and walking machine |
| CN104675768A (en) * | 2015-02-09 | 2015-06-03 | 扬州金威环保科技有限公司 | Walking hydraulic system for small all-hydraulic all-wheel drive road sweeper |
| CN106149537A (en) * | 2016-08-22 | 2016-11-23 | 徐州徐工筑路机械有限公司 | A kind of milling mechanism hydraulic traveling system antiskid system |
| CN106740081A (en) * | 2016-12-16 | 2017-05-31 | 徐工消防安全装备有限公司 | A kind of aerial work platform four-wheel-driven control system |
| CN208417106U (en) * | 2018-05-16 | 2019-01-22 | 湖南星邦重工有限公司 | A kind of hydraulic moving control system |
-
2019
- 2019-12-06 CN CN201911243163.1A patent/CN111022436B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008082130A (en) * | 2006-09-29 | 2008-04-10 | Kubota Corp | Hydraulic system of backhoe |
| CN102582425A (en) * | 2011-12-20 | 2012-07-18 | 徐州重型机械有限公司 | Walking hydraulic control system and self-walking type engineering machinery utilizing same |
| CN103016431A (en) * | 2012-12-17 | 2013-04-03 | 莱恩农业装备有限公司 | Hydraulic system of full hydraulic seedling planting machine |
| CN203297177U (en) * | 2013-05-15 | 2013-11-20 | 湖南三一路面机械有限公司 | Hydraulic walking drive system and walking machine |
| CN104675768A (en) * | 2015-02-09 | 2015-06-03 | 扬州金威环保科技有限公司 | Walking hydraulic system for small all-hydraulic all-wheel drive road sweeper |
| CN106149537A (en) * | 2016-08-22 | 2016-11-23 | 徐州徐工筑路机械有限公司 | A kind of milling mechanism hydraulic traveling system antiskid system |
| CN106740081A (en) * | 2016-12-16 | 2017-05-31 | 徐工消防安全装备有限公司 | A kind of aerial work platform four-wheel-driven control system |
| CN208417106U (en) * | 2018-05-16 | 2019-01-22 | 湖南星邦重工有限公司 | A kind of hydraulic moving control system |
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Effective date of registration: 20210106 Address after: 410010 room 4110, 4th floor, office building, 677 Lugu Avenue, high tech Development Zone, Changsha City, Hunan Province Applicant after: Hunan Zoomlion intelligent aerial work machinery Co.,Ltd. Address before: 410013 No. 361 South silver basin, Changsha, Hunan, Yuelu District Applicant before: Zoomlion Heavy Industry Science and Technology Co.,Ltd. |
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