阅读说明：本技术 液压行走系统和自行走式高空作业平台 (Hydraulic walking system and self-walking aerial work platform ) 是由 陈思瑶 张红飞 郑波 彭宽洋 于 2020-07-31 设计创作，主要内容包括：本发明公开一种液压行走系统和自行走式高空作业平台,液压行走系统包括：第一液压马达,包括第一油口和第二油口；第二液压马达,包括第三油口和第四油口；供油装置,用于向第一液压马达和第二液压马达供油,包括与第一液压马达和第二液压马达连接的第五油口；分流集流阀,包括集流油口、第一分流油口和第二分流油口,集流油口与第五油口连接,第一分流油口和第一油口连接,第二分流油口与第三油口连接；旁通管路,包括两端分别与第一分流油口和第五油口连接的第一管路和两端分别与第二分流油口和第五油口连接的第二管路；控制阀组,包括用于控制第一管路通断的第一通断阀和用于控制第二管路通断的第二通断阀。(The invention discloses a hydraulic traveling system and a self-traveling aerial working platform, wherein the hydraulic traveling system comprises: the first hydraulic motor comprises a first oil port and a second oil port; the second hydraulic motor comprises a third oil port and a fourth oil port; the oil supply device is used for supplying oil to the first hydraulic motor and the second hydraulic motor and comprises a fifth oil port connected with the first hydraulic motor and the second hydraulic motor; the flow distributing and collecting valve comprises a flow collecting oil port, a first flow distributing oil port and a second flow distributing oil port, the flow collecting oil port is connected with the fifth oil port, the first flow distributing oil port is connected with the first oil port, and the second flow distributing oil port is connected with the third oil port; the bypass pipeline comprises a first pipeline with two ends respectively connected with the first flow dividing oil port and the fifth oil port and a second pipeline with two ends respectively connected with the second flow dividing oil port and the fifth oil port; and the control valve group comprises a first on-off valve for controlling the on-off of the first pipeline and a second on-off valve for controlling the on-off of the second pipeline.)

1. A hydraulic travel system, comprising:

a first hydraulic motor (11) for driving the first traveling wheel, including a first oil port (a1) and a second oil port (a 2);

a second hydraulic motor (12) for driving the second road wheel, including a third oil port (a3) and a fourth oil port (a 4);

an oil supply device for supplying oil to the first hydraulic motor (11) and the second hydraulic motor (12), including a fifth oil port (a5) connected to the first hydraulic motor (11) and the second hydraulic motor (12);

the flow dividing and collecting valve (13) comprises a flow dividing and collecting oil port (b3), a first flow dividing oil port (b1) and a second flow dividing oil port (b2), the flow dividing and collecting oil port (b3) is connected with the fifth oil port (a5), the first flow dividing oil port (b1) is connected with the first oil port (a1), and the second flow dividing oil port (b2) is connected with the third oil port (a 3);

a bypass line including a first line (21) having both ends connected to the first branch oil port (b1) and the fifth oil port (a5), respectively, and a second line (22) having both ends connected to the second branch oil port (b2) and the fifth oil port (a5), respectively;

and the control valve group comprises a first on-off valve for controlling the on-off of the first pipeline (21) and a second on-off valve for controlling the on-off of the second pipeline (22).

2. The hydraulic traveling system according to claim 1, wherein the first on-off valve includes a first pilot-controlled valve (31) provided on the first pipeline (21), the second on-off valve includes a second pilot-controlled valve (32) provided on the second pipeline (22), the hydraulic traveling system further includes a first pilot-controlled pipeline (41), the first pilot-controlled pipeline (41) is connected to both a first pilot-controlled end of the first pilot-controlled valve (31) and a first pilot-controlled end of the second pilot-controlled valve (32), the control valve group further includes a first directional control valve (51) having an oil outlet connected to the first pilot-controlled pipeline (41), the first directional control valve (51) is configured to adjust a magnitude of hydraulic oil pressure of hydraulic oil sent from the first pilot-controlled pipeline (41) to the first pilot-controlled ends of the first pilot-controlled valve (31) and the second pilot-controlled valve (32) by a switching valve position, so as to control the on-off of the first hydraulic control valve (31) and the second hydraulic control valve (32).

3. The hydraulic traveling system according to claim 2, further comprising a sixth oil port (a6) connected to both the second oil port (a2) and the fourth oil port (a4), the oil supply device supplying oil to the first hydraulic motor (11) and the second hydraulic motor (12) through the fifth oil port (a5) or the sixth oil port (a6), an oil tank (19) and a second direction valve (52), the second direction valve (52) comprising two oil inlets connected to the fifth oil port (a5) and the sixth oil port (a6), respectively, an oil inlet and an oil outlet of the first direction valve (51) being connected to an oil outlet of the second direction valve (52) and the oil tank (19), respectively, the first direction valve (51) being configured to switch a valve position so that the first pilot-controlled line (41) communicates with the second direction valve (52) and the oil outlet of the direction valve (52) at the same time A tank (19) is switched to communicate, and the second direction valve (52) is configured such that an oil outlet thereof communicates with a low oil pressure port of the fifth port (a5) and the sixth port (a 6).

4. The hydraulic traveling system according to claim 3, wherein the second directional control valve (52) is a three-position three-way hydraulic control directional control valve, the second directional control valve (52) includes a first oil inlet connected to the fifth oil port (a5), a second oil inlet and an oil outlet connected to the sixth oil port (a6), a first hydraulic control end and a second hydraulic control end of the second directional control valve (52) are respectively communicated with the first oil inlet and the second oil inlet, when an oil pressure of the first hydraulic control end of the second directional control valve (52) is higher than that of the second hydraulic control end, the second directional control valve (52) is switched to a first valve position, a second oil inlet and an oil outlet of the second directional control valve (52) are communicated, and when an oil pressure of the second hydraulic control end of the second directional control valve (52) is higher than that of the first hydraulic control end, the second directional control valve (52) is switched to a third valve position, the first oil inlet and the oil outlet of the second reversing valve (52) are communicated, the oil pressure of the first hydraulic control end and the oil pressure of the second hydraulic control end of the second reversing valve (52) are the same, the second reversing valve (52) is switched to a second valve position, and the first oil inlet, the second oil inlet and the oil outlet of the second reversing valve (52) are not communicated.

5. The hydraulic traveling system according to claim 3, wherein the second hydraulic control end of the first hydraulic control valve (31) has two hydraulic control ports, the two hydraulic control ports of the first hydraulic control valve (31) are respectively connected with the fifth oil port (a5) and the first branch oil port (b1), the first hydraulic control end of the first hydraulic control valve (31) is further provided with a spring, when the first hydraulic control pipeline (41) is communicated with the oil outlet of the second reversing valve (52), the first hydraulic control valve (31) is in the first valve position, the first pipeline (21) is disconnected, when the first hydraulic control pipeline (41) is communicated with the oil tank (19), the first hydraulic control valve (31) is in the second valve position, and the first pipeline (21) is communicated; the second hydraulic control end of the second hydraulic control valve (32) is provided with two hydraulic control ports, the two hydraulic control ports of the second hydraulic control valve (32) are respectively connected with the fifth oil port (a5) and the second shunt oil port (b2), the second hydraulic control end of the second hydraulic control valve (32) is further provided with a spring, when the first hydraulic control pipeline (41) is communicated with the oil outlet of the second reversing valve (52), the second hydraulic control valve (32) is in the first valve position, the second pipeline (22) is disconnected, when the first hydraulic control pipeline (41) is communicated with the oil tank (19), the second hydraulic control valve (32) is in the second valve position, and the second pipeline (22) is communicated.

6. The hydraulic traveling system according to claim 3, characterized in that the first hydraulic motor (11) and the second hydraulic motor (12) are variable displacement motors, the hydraulic traveling system further comprises a second pilot-controlled line (42), the second pilot-controlled line (42) is connected to both the first hydraulic motor (11) and the variable displacement adjusting mechanism (18) of the second hydraulic motor (12), the hydraulic traveling system further comprises a third directional control valve (53), the third directional control valve (53) comprises an oil inlet, an oil outlet and an oil outlet, the oil outlet of the third directional control valve (53) is connected to the second pilot-controlled line (42), the oil inlet and the oil outlet of the third directional control valve (53) are connected to the oil outlet of the second directional control valve (52) and the oil tank (19), respectively, and the third directional control valve (53) is configured to adjust the position of the second pilot-controlled line (42) to feed the first hydraulic motor (11) And a hydraulic oil pressure of a variable displacement adjustment mechanism (18) of the second hydraulic motor (12) to adjust displacement of the first hydraulic motor (11) and the second hydraulic motor (12).

7. The hydraulic traveling system according to claim 6, characterized in that the first direction switching valve (51) and/or the third direction switching valve (53) are/is an electromagnetic direction switching valve.

8. The hydraulic traveling system according to any one of claims 1 to 7, further comprising a choke (17), wherein both ends of the choke (17) are connected to the first branch oil port (b1) and the second branch oil port (b2), respectively.

9. The hydraulic traveling system according to any one of claims 1 to 7, wherein the hydraulic traveling system is a closed hydraulic traveling system, the oil supply device includes a sixth oil port (a6) connected to both the second oil port (a2) and the fourth oil port (a4), the oil supply device includes a bidirectional hydraulic pump (14), and the bidirectional hydraulic pump (14) includes the fifth oil port (a5) and the sixth oil port (a 6).

10. The hydraulic traveling system according to claim 9, wherein the oil supply device further includes an oil supply pump (15), a first check valve (161), and a second check valve (162), an oil outlet of the oil supply pump (15) is connected to oil inlets of the first check valve (161) and the second check valve (162), and oil outlets of the first check valve (161) and the second check valve (162) are connected to the fifth oil port (a5) and the sixth oil port (a6), respectively.

11. A self-propelled aerial work platform comprising a hydraulic walking system as claimed in any one of claims 1 to 10.

Technical Field

The invention relates to the field of hydraulic pressure, in particular to a hydraulic traveling system and a self-traveling aerial working platform.

Background

The hydraulic traveling system is a traveling system which utilizes hydraulic oil to transmit driving force, and usually an engine drives a hydraulic pump to rotate, the hydraulic pump provides hydraulic oil for a hydraulic motor to drive the hydraulic motor to rotate, and the hydraulic motor drives traveling wheels to rotate so as to enable a vehicle to travel. In order to enable the vehicle to have better straight-line traveling capacity, the hydraulic pump is connected with the plurality of hydraulic motors through the flow dividing and collecting valve, and under the action of the flow dividing and collecting valve, the flow of hydraulic oil passing through the hydraulic motors is kept the same, so that the wheel speeds of traveling wheels driven by the hydraulic motors can be the same, and the traveling machinery such as a self-traveling type aerial work platform has better straight-line traveling capacity. However, the hydraulic oil passing through the flow dividing and collecting valve generates a large pressure loss, which causes the system to generate heat and increases the fuel consumption.

Disclosure of Invention

The invention aims to provide a hydraulic traveling system which can selectively enable hydraulic oil flowing through a hydraulic motor to flow through a flow dividing and collecting valve or not flow through the flow dividing and collecting valve.

The first aspect of the present invention discloses a hydraulic traveling system, including:

the first hydraulic motor is used for driving the first travelling wheel and comprises a first oil port and a second oil port;

the second hydraulic motor is used for driving the second travelling wheel and comprises a third oil port and a fourth oil port;

the oil supply device is used for supplying oil to the first hydraulic motor and the second hydraulic motor and comprises a fifth oil port connected with the first hydraulic motor and the second hydraulic motor;

the flow distributing and collecting valve comprises a flow collecting oil port, a first flow distributing oil port and a second flow distributing oil port, the flow collecting oil port is connected with the fifth oil port, the first flow distributing oil port is connected with the first oil port, and the second flow distributing oil port is connected with the third oil port;

the bypass pipeline comprises a first pipeline and a second pipeline, wherein two ends of the first pipeline are respectively connected with the first flow dividing oil port and the fifth oil port, and two ends of the second pipeline are respectively connected with the second flow dividing oil port and the fifth oil port;

and the control valve group comprises a first on-off valve for controlling the on-off of the first pipeline and a second on-off valve for controlling the on-off of the second pipeline.

In some embodiments, the first on-off valve includes a first hydraulic control valve disposed on the first pipeline, the second on-off valve includes a second hydraulic control valve disposed on the second pipeline, the hydraulic traveling system further includes a first hydraulic control pipeline, the first hydraulic control pipeline is connected to both a first hydraulic control end of the first hydraulic control valve and a first hydraulic control end of the second hydraulic control valve, the control valve group further includes a first reversing valve having an oil outlet connected to the first hydraulic control pipeline, and the first reversing valve is configured to adjust, by switching a valve position, an oil pressure of hydraulic oil delivered from the first hydraulic control pipeline to the first hydraulic control end of the first hydraulic control valve and an oil pressure of hydraulic oil delivered from the first hydraulic control end of the second hydraulic control valve, so as to control on-off of the first hydraulic control valve and the second hydraulic control valve.

In some embodiments, the oil supply device further includes a sixth oil port connected to both the second oil port and the fourth oil port, the oil supply device supplies oil to the first hydraulic motor and the second hydraulic motor through the fifth oil port or the sixth oil port, the hydraulic traveling system also comprises an oil tank and a second reversing valve, the second reversing valve comprises two oil inlets which are respectively connected with the fifth oil port and the sixth oil port, the oil inlet and the oil outlet of the first reversing valve are respectively connected with the oil outlet of the second reversing valve and the oil tank, the first reversing valve is configured to switch the first pilot-controlled pipeline between communicating with the oil outlet of the second reversing valve and communicating with the oil tank by switching a valve position, the second directional control valve is configured such that an oil outlet thereof communicates with a low oil pressure port of the fifth port and the sixth port.

In some embodiments, the second directional control valve is a three-position three-way hydraulic control directional control valve, the second directional control valve includes a first oil inlet connected to the fifth oil port, a second oil inlet connected to the sixth oil port, and an oil outlet, the first hydraulic control end and the second hydraulic control end of the second directional control valve are respectively communicated with the first oil inlet and the second oil inlet, when the oil pressure of the first hydraulic control end of the second directional control valve is higher than that of the second hydraulic control end, the second directional control valve is switched to the first valve position, the second oil inlet of the second directional control valve is communicated with the oil outlet, when the oil pressure of the second hydraulic control end of the second directional control valve is higher than that of the first hydraulic control end, the second directional control valve is switched to the third valve position, the first oil inlet of the second directional control valve is communicated with the oil outlet, and the oil pressures of the first hydraulic control end and the second hydraulic control end of the second directional control valve are the same, and the second reversing valve is switched to a second valve position, and a first oil inlet, a second oil inlet and an oil outlet of the second reversing valve are not communicated.

In some embodiments, the second hydraulic control end of the first hydraulic control valve has two hydraulic control ports, the two hydraulic control ports of the first hydraulic control valve are respectively connected with the fifth oil port and the first shunt oil port, the first hydraulic control end of the first hydraulic control valve is further provided with a spring, when the first hydraulic control pipeline is communicated with the oil outlet of the second reversing valve, the first hydraulic control valve is in the first valve position, the first pipeline is disconnected, and when the first hydraulic control pipeline is communicated with the oil tank, the first hydraulic control valve is in the second valve position, the first pipeline is communicated; the second hydraulic control end of the second hydraulic control valve is provided with two hydraulic control ports, the two hydraulic control ports of the second hydraulic control valve are respectively connected with the fifth oil port and the second shunt oil port, the second hydraulic control end of the second hydraulic control valve is further provided with a spring, when the first hydraulic control pipeline is communicated with the oil outlet of the second reversing valve, the second hydraulic control valve is at the first valve position, the second pipeline is disconnected, and when the first hydraulic control pipeline is communicated with the oil tank, the second hydraulic control valve is at the second valve position, and the second pipeline is communicated.

In some embodiments, the first and second hydraulic motors are variable displacement motors, the hydraulic traveling system also comprises a second hydraulic control pipeline which is connected with the variable displacement adjusting mechanisms of the first hydraulic motor and the second hydraulic motor, the hydraulic traveling system also comprises a third reversing valve, the third reversing valve comprises an oil inlet, an oil outlet and an oil outlet, an oil outlet of the third reversing valve is connected with the second hydraulic control pipeline, an oil inlet and an oil outlet of the third reversing valve are respectively connected with an oil outlet of the second reversing valve and the oil tank, the third directional control valve is configured to adjust the oil pressure of hydraulic oil sent to the variable displacement adjustment mechanisms of the first and second hydraulic motors by the second hydraulic line by switching a valve position to adjust the displacement of the first and second hydraulic motors.

In some embodiments, the first and/or third directional valves are solenoid directional valves.

In some embodiments, the hydraulic traveling system further includes a choke, and both ends of the choke are respectively connected to the first branch oil port and the second branch oil port.

In some embodiments, the hydraulic traveling system is a closed hydraulic traveling system, the oil supply device includes a sixth oil port connected to both the second oil port and the fourth oil port, and the oil supply device includes a bidirectional hydraulic pump including the fifth oil port and the sixth oil port.

In some embodiments, the oil supply device further includes an oil replenishing pump, a first check valve and a second check valve, an oil outlet of the oil replenishing pump is connected to oil inlets of the first check valve and the second check valve, and oil outlets of the first check valve and the second check valve are respectively connected to the fifth oil port and the sixth oil port.

The invention discloses a self-walking aerial working platform in a second aspect, which comprises the hydraulic walking system.

Based on the hydraulic traveling system provided by the invention, by arranging the bypass pipeline and the control valve bank, when the road is uneven and the control valve bank controls the first pipeline and the second pipeline to be disconnected, hydraulic oil flows through the flow dividing and collecting valve and enters the first hydraulic motor and the second hydraulic motor, or hydraulic oil flowing out of the first hydraulic motor and the second hydraulic motor flows through the flow dividing and collecting valve, the flow dividing and collecting valve can play a role of enabling the flow of the hydraulic oil flowing through the first hydraulic motor and the second hydraulic motor to be the same, and the traveling machine has better linear traveling capacity. When the road is smooth, the control valve group controls the first pipeline to be communicated with the second pipeline, so that hydraulic oil can bypass the flow distribution and collection valve and enter the first hydraulic motor and the second hydraulic motor from the first pipeline and the second pipeline, or hydraulic oil flowing out of the first hydraulic motor and the second hydraulic motor bypasses the flow distribution and collection valve and flows out of the first pipeline and the second pipeline, hydraulic loss caused when the hydraulic oil flows through the flow distribution and collection valve is reduced, and the fuel utilization rate of the system is improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural diagram of a hydraulic traveling system according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, the hydraulic traveling system according to the embodiment of the present invention includes a first hydraulic motor 11, a second hydraulic motor 12, an oil supply device, a flow dividing and combining valve 13, a bypass line, and a control valve group.

The first hydraulic motor 11 is used to drive the first traveling wheel, and the first hydraulic motor 11 includes a first oil port a1 and a second oil port a 2. The second hydraulic motor 12 is used to drive the second road wheel, and the second hydraulic motor 12 includes a third oil port a3 and a fourth oil port a 4. The two oil ports of the first hydraulic motor 11 and the second hydraulic motor 12 are used for oil intake and oil discharge. In the embodiment shown in fig. 1, the first hydraulic motor 11 and the second hydraulic motor 12 are bidirectional hydraulic motors, and the first hydraulic motor 11 and the second hydraulic motor 12 can be driven to rotate in different directions by feeding and discharging oil from different oil ports of the two oil ports of the bidirectional hydraulic motors, so that the first traveling wheel and the second traveling wheel can be driven to rotate in different directions. In some embodiments not shown in the drawings, the first hydraulic motor 11 and the second hydraulic motor 12 may also be unidirectional hydraulic motors, and at this time, the first hydraulic motor 11, the second hydraulic motor 12 and the corresponding road wheels are driven by arranging a transmission device, and the transmission device may change a transmission direction, and when the road wheels are to rotate in different directions, the transmission direction of the transmission device may be changed.

The oil supply device is used to supply oil to the first hydraulic motor 11 and the second hydraulic motor 12, and includes a fifth port a5 connected to the first hydraulic motor 11 and the second hydraulic motor 12. In the embodiment shown in fig. 1, the first hydraulic motor 11 and the second hydraulic motor 12 are both bidirectional hydraulic motors, the oil supply device includes a bidirectional hydraulic pump, the bidirectional hydraulic pump includes a fifth oil port a5 and a sixth oil port a6, the fifth oil port a5 of the bidirectional hydraulic pump is connected with one oil port of the first hydraulic motor 11 and with one oil port of the second hydraulic motor 12, the sixth oil port a6 of the bidirectional hydraulic pump is connected with the other oil port of the first hydraulic motor 11 and with the other oil port of the second hydraulic motor 12, when the first and second hydraulic motors 11 and 12 are rotated in one direction, the fifth port a5 of the bidirectional hydraulic pump is used to supply oil thereto, when the first and second hydraulic motors 11 and 12 rotate in opposite directions, the sixth port a6 supplies oil thereto, and the fifth port a5 receives the oil discharged from the first and second hydraulic motors 11 and 12. In some embodiments not shown in the drawings, the first hydraulic motor 11 and the second hydraulic motor 12 are both bidirectional hydraulic motors, the oil supply device may also include a unidirectional hydraulic pump and a reversing valve connected between the first hydraulic motor 11, the second hydraulic motor 12 and the unidirectional hydraulic pump, and the unidirectional hydraulic pump is communicated with the oil ports of the first hydraulic motor 11 and the second hydraulic motor 12 through a valve position change of the reversing valve, so as to realize rotation of the first hydraulic motor 11 and the second hydraulic motor 12 in different directions, in this case, the fifth oil port a5 may be an oil outlet of the unidirectional hydraulic pump or an oil outlet of the reversing valve.

The flow dividing and collecting valve 13 comprises a collecting oil port b3, a first flow dividing oil port b1 and a second flow dividing oil port b 2. When the hydraulic oil is input from the collecting oil port b3 and output from the first branch oil port b1 and the second branch oil port b2, the flow rates of the hydraulic oil output from the first branch oil port b1 and the second branch oil port b2 are the same. When the hydraulic oil is input from the first branch oil port b1 and the second branch oil port b2 and output from the collecting oil port b3, the flow rates of the hydraulic oil input from the first branch oil port b1 and the second branch oil port b2 are the same. The manifold port b3 is connected to the fifth port a5, the first branch port b1 is connected to the first port a1, and the second branch port b2 is connected to the third port a 3. The first hydraulic motor 11 and the second hydraulic motor 12 can correspondingly drive two corresponding traveling wheels on two sides of the traveling machine, such as a left front wheel and a right front wheel, or a left rear wheel and a right rear wheel, when the hydraulic traveling system works and the flow dividing and collecting valve 13 works, the flow of hydraulic oil passing through the first hydraulic motor 11 and the second hydraulic motor 12 is the same, so that the rotating speeds of the two corresponding driven traveling wheels are the same, and the traveling machine can keep good linear traveling capacity.

As shown in fig. 1, the bypass line includes a first line 21 having both ends connected to the first branch port b1 and the fifth port a5, respectively, and a second line 22 having both ends connected to the second branch port b2 and the fifth port a5, respectively.

The control valve group comprises a first on-off valve for controlling the on-off of the first pipeline 21 and a second on-off valve for controlling the on-off of the second pipeline 22. When the first block valve communicates the first pipe line 21 and the second block valve communicates the second pipe line 22, the hydraulic oil flowing from the fifth port a5 to the first hydraulic motor 11 and the second hydraulic motor 12 or the hydraulic oil flowing from the first hydraulic motor 11 and the second hydraulic motor 12 to the fifth port a5 may directly flow through the first pipe line 21 and the second pipe line 22 having a small resistance without passing through the flow dividing and combining valve 13, and the flow dividing and combining valve 13 does not function. When the first on-off valve disconnects the first pipeline 21 and the second on-off valve disconnects the second pipeline 22, the hydraulic oil still passes through the flow dividing and combining valve 13, and the flow dividing and combining valve 13 still functions.

The hydraulic traveling system of the embodiment is provided with the bypass pipeline and the control valve bank, when the road is uneven, the first pipeline 21 and the second pipeline 22 can be controlled to be disconnected through the control valve bank, hydraulic oil flows through the flow dividing and collecting valve 13 and enters the first hydraulic motor 11 and the second hydraulic motor 12, or hydraulic oil flowing out of the first hydraulic motor 11 and the second hydraulic motor 12 flows through the flow dividing and collecting valve 13, the flow dividing and collecting valve 13 can play a role in enabling the hydraulic oil flowing through the first hydraulic motor 11 and the second hydraulic motor 12 to have the same flow, and the traveling machine has better linear traveling capacity. When the road is level, the first pipeline 21 and the second pipeline 22 can be controlled to be communicated through the control valve group, so that hydraulic oil can bypass the flow distribution and collection valve 13 and enter the first hydraulic motor 11 and the second hydraulic motor 12 from the first pipeline 21 and the second pipeline 22, or hydraulic oil flowing out of the first hydraulic motor 11 and the second hydraulic motor 12 bypasses the flow distribution and collection valve 13 and flows out of the first pipeline 21 and the second pipeline 22, hydraulic loss caused when the hydraulic oil flows through the flow distribution and collection valve 13 is reduced, system heating is reduced, and the hydraulic oil utilization rate of the system is improved.

As shown in fig. 1, in some embodiments, the first on-off valve includes a first pilot-controlled valve 31 disposed on the first pipeline 21, the second on-off valve includes a second pilot-controlled valve 32 disposed on the second pipeline 22, the hydraulic traveling system further includes a first pilot-controlled pipeline 41 (shown in a dotted line in the figure), the first pilot-controlled pipeline 41 is connected to both the first pilot-controlled end of the first pilot-controlled valve 31 and the first pilot-controlled end of the second pilot-controlled valve 32, the control valve group further includes a first direction valve 51 having an oil outlet connected to the first pilot-controlled pipeline 41, and the first direction valve 51 is configured to adjust the magnitude of the oil pressure of the hydraulic oil delivered from the first pilot-controlled pipeline 41 to the first pilot-controlled ends of the first pilot-controlled valve 31 and the second pilot-controlled valve 32 by switching valve positions, so as to control the first pilot-controlled valve 31 and the second pilot-controlled valve 32 to control the on-off of the first pipeline 21. For example, in the embodiment shown in fig. 1, when the first direction changing valve 51 switches the valve positions to connect the first pilot-controlled line 41 with the high-pressure hydraulic oil, the first pilot-controlled line 41 delivers the high-pressure hydraulic oil to the first pilot-controlled end of the first pilot-controlled valve 31 and the first pilot-controlled end of the second pilot-controlled valve 32, and at this time, the first pilot-controlled valve 31 and the second pilot-controlled valve 32 are in the disconnected state, that is, the first pipeline 21 and the second pipeline 22 are in the disconnected state. When the first direction valve 51 switches the valve position to connect the first pilot-controlled pipeline 41 with the low-pressure hydraulic oil, the first pilot-controlled pipeline 41 delivers the low-pressure hydraulic oil to the first pilot-controlled end of the first pilot-controlled valve 31 and the first pilot-controlled end of the second pilot-controlled valve 32, and at this time, the switching valve positions of the first pilot-controlled valve 31 and the second pilot-controlled valve 32 are in a communicating state, that is, the first pipeline 21 and the second pipeline 22 are in a communicating state. In this embodiment, the first directional control valve 51 is used to control the first pilot control valve 31 and the second pilot control valve 32 in a pilot-controlled manner, and the pilot-controlled manner is sensitive, so that the first pilot control valve 31 and the second pilot control valve 32 can be controlled to be disconnected or connected at the same time, and the state of the hydraulic traveling system can be changed quickly.

In some embodiments, as shown in fig. 1, the oil supply device further includes a sixth port a6 connected to both the second port a2 and the fourth port a4, the oil supply device supplies oil to the first hydraulic motor 11 and the second hydraulic motor 12 through the fifth port a5 or the sixth port a6, the hydraulic traveling system further includes an oil tank 19 and a second direction valve 52, the second direction valve 52 includes two oil inlets connected to the fifth port a5 and the sixth port a6, respectively, the oil inlet and the oil outlet of the first direction valve 51 are connected to the oil outlet of the second direction valve 52 and the oil tank 19, respectively, the first direction valve 51 is configured to switch the first pilot-controlled line 41 between communicating with the oil outlet of the second direction valve 52 and communicating with the oil tank 19 by switching the valve positions, and the second direction valve 52 is configured to have the oil outlet thereof communicating with the low oil pressure port of the fifth port a5 and the sixth port a 6. In this embodiment, when the first hydraulic control pipeline 41 is to be connected to the high-pressure hydraulic oil, the first hydraulic control pipeline is always communicated with the low-oil pressure oil ports of the fifth oil port a5 and the sixth oil port a6, so that the first hydraulic control pipeline 41 can obtain the high-pressure hydraulic oil with relatively stable pressure, and the obtained pressure of the high-pressure hydraulic oil is suitable for the hydraulic control end of the hydraulic control valve.

In some embodiments, as shown in fig. 1, the second direction valve 52 is a three-position three-way hydraulic control direction valve, the second direction valve 52 includes a first oil inlet connected to the fifth oil port a5, a second oil inlet connected to the sixth oil port a6, and an oil outlet, the first hydraulic control end and the second hydraulic control end of the second direction valve 52 are respectively communicated with the first oil inlet and the second oil inlet, the high-oil hydraulic control end of the first hydraulic control end and the second hydraulic control end of the second direction valve 52 pushes the second direction valve 52 to switch the valve position, and the high-oil hydraulic control end refers to a hydraulic control end with a larger oil pressure in the first hydraulic control end and the second hydraulic control end of the second direction valve 52. When the first hydraulic control end of the second directional valve 52 is a high hydraulic control end, that is, the oil pressure of the first hydraulic control end is greater than that of the second hydraulic control end, at this time, the hydraulic oil pressure of the fifth oil port a5 is greater than that of the sixth oil port a6, the second directional valve 52 is switched to the first valve position, and the second oil inlet of the second directional valve 52 is communicated with the oil outlet. When the second hydraulic control end of the second reversing valve 52 is a high-oil-pressure hydraulic control end, that is, the oil pressure of the second hydraulic control end is greater than that of the first hydraulic control end, at this time, the hydraulic oil pressure of the sixth oil port a6 is greater than that of the fifth oil port a5, the second reversing valve 52 is switched to the third valve position, the first oil inlet of the second reversing valve 52 is communicated with the oil outlet, the first hydraulic control end of the second reversing valve 52 is the same as the oil pressure of the second hydraulic control end, the second reversing valve 52 is switched to the second valve position, and the first oil inlet, the second oil inlet and the oil outlet of the second reversing valve 52 are not communicated. The present embodiment can conveniently and reliably realize the communication of the oil outlet of the second direction valve 52 with the low oil pressure port of the fifth port a5 and the sixth port a 6.

In some embodiments, the second pilot-controlled end of the first pilot-controlled valve 31 has two pilot-controlled ports, the two pilot-controlled ports of the first pilot-controlled valve 31 are respectively connected to the fifth oil port a5 and the first branch oil port b1, the first pilot-controlled end of the first pilot-controlled valve 31 is further provided with a spring, when the first pilot-controlled line 41 is communicated with the oil outlet of the second directional control valve 52, the first pilot-controlled valve 31 is at the first position thereof, the first line 21 is disconnected, when the first pilot-controlled line 41 is communicated with the oil tank 19, the first pilot-controlled valve 31 is at the second position thereof, and the first line 21 is communicated; the second pilot control end of the second pilot control valve 32 has two pilot control ports, the two pilot control ports of the second pilot control valve 32 are respectively connected to the fifth oil port a5 and the second branch oil port b2, the second pilot control end of the second pilot control valve 32 is further provided with a spring, when the first pilot control pipeline 41 is communicated with the oil outlet of the second directional control valve 52, the second pilot control valve 32 is at the first valve position, the second pipeline 22 is disconnected, and when the first pilot control pipeline 41 is communicated with the oil tank 19, the second pilot control valve 32 is at the second valve position, and the second pipeline 22 is communicated. The embodiment can stably and reliably realize the hydraulic control switching valve positions of the first hydraulic control valve and the second hydraulic control valve.

In some embodiments, the first hydraulic motor 11 and the second hydraulic motor 12 are variable displacement motors, the hydraulic traveling system further includes a second hydraulic control line 42, the second hydraulic control line 42 is connected to both the variable displacement adjustment mechanisms 18 of the first hydraulic motor 11 and the second hydraulic motor 12, the hydraulic traveling system further includes a third directional valve 53, the third directional valve 53 includes an oil inlet, an oil outlet, and an oil outlet, the oil outlet of the third directional valve 53 is connected to the second hydraulic control line 42, the oil inlet and the oil outlet of the third directional valve 53 are respectively connected to the oil outlet of the second directional valve 52 and the oil tank 19, and the third directional valve 53 is configured to adjust the oil pressure of the hydraulic oil entering the variable displacement adjustment mechanisms 18 of the first hydraulic motor 11 and the second hydraulic motor 12 by switching the valve positions to adjust the displacement of the first hydraulic motor 11 and the displacement of the second hydraulic motor 12. In the embodiment, the third directional control valve 53 is provided, so that the displacement of the first hydraulic motor 11 and the displacement of the second hydraulic motor 12 can be adjusted, and thus the relationship between the rotational speed and the torque of the first hydraulic motor 11 and the rotational speed of the second hydraulic motor 12 can be adjusted, for example, a high-torque low-rotational-speed walking mode of a walking machine or a low-torque high-rotational-speed walking mode of a walking machine is realized, and meanwhile, the third directional control valve 53 is connected with the oil outlet of the second directional control valve 52, so that the pressure of hydraulic oil can be stabilized when a hydraulic control pipeline of the variable displacement adjusting mechanism 18 is connected with high-pressure hydraulic oil.

In some embodiments, the first direction valve 51 and/or the third direction valve 53 are solenoid direction valves.

In some embodiments, as shown in fig. 1, the hydraulic traveling system further includes a choke 17, and both ends of the choke 17 are connected to the first branch oil port b1 and the second branch oil port b2, respectively. The orifice 17 is provided to adaptively adjust the flow rate of the hydraulic oil between the first hydraulic motor 11 and the second hydraulic motor 12 when the traveling machine turns the first hydraulic motor 11 and the second hydraulic motor 12 with a difference in rotation speed.

In some embodiments, the hydraulic traveling system is a closed hydraulic traveling system, the oil supply device further includes a sixth oil port a6 connected to both the second oil port a2 and the fourth oil port a4, the oil supply device includes a bidirectional hydraulic pump 14, and the bidirectional hydraulic pump 14 includes a fifth oil port a5 and a sixth oil port a 6.

In some embodiments, the oil supply apparatus further includes an oil replenishing pump 15 and first and second check valves 161 and 162, an oil outlet of the oil replenishing pump 15 is connected to oil inlets of the first and second check valves 161 and 162, and oil outlets of the first and second check valves 161 and 162 are connected to fifth and sixth oil ports a5 and a6, respectively. This setting can realize hydraulic traveling system's oil supplementation, is favorable to improving hydraulic traveling system's reliable and stable nature.

Also disclosed in some embodiments is a self-propelled aerial work platform comprising a hydraulic locomotion system.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.