阅读说明：本技术 一种泵送臂架液压系统及工程机械 (Pumping boom hydraulic system and engineering machinery ) 是由 尹铁军 于 2021-07-27 设计创作，主要内容包括：本发明提出了一种泵送臂架液压系统,其特征在于,包括油泵、若干根管路、若干个补偿阀、若干个换向阀、若干个比例阀和若干根并列设置的油缸,所述油泵的出油端分别通过管路与补偿阀和换向阀连通,所述补偿阀和换向阀通过管路与比例阀连通；所述油缸包括有杆腔和无杆腔,所述比例阀分别通过管路与有杆腔和无杆腔连通。此结构的泵送臂架液压系统,工作时,压力油从油泵的出油端进入管路,再进入补偿阀、换向阀和比例阀,最后进入油缸的有杆腔或无杆腔,与现有结构的泵送臂架液压系统相比,其有效简化了管路布局,整体上减轻了臂架的重量,因此,其生产和使用成本更低。此外,本发明还提出一种包括上述泵送臂架液压系统的工程机械。(The invention provides a hydraulic system of a pumping arm support, which is characterized by comprising an oil pump, a plurality of pipelines, a plurality of compensating valves, a plurality of reversing valves, a plurality of proportional valves and a plurality of oil cylinders which are arranged in parallel, wherein the oil outlet end of the oil pump is respectively communicated with the compensating valves and the reversing valves through the pipelines, and the compensating valves and the reversing valves are communicated with the proportional valves through the pipelines; the oil cylinder comprises a rod cavity and a rodless cavity, and the proportional valve is communicated with the rod cavity and the rodless cavity through pipelines respectively. When the pumping boom hydraulic system with the structure works, pressure oil enters the pipeline from the oil outlet end of the oil pump, then enters the compensating valve, the reversing valve and the proportional valve, and finally enters the rod cavity or the rodless cavity of the oil cylinder. In addition, the invention further provides engineering machinery comprising the pumping boom hydraulic system.)

1. A hydraulic system of a pumping arm support is characterized by comprising an oil pump, a plurality of pipelines, a plurality of compensation valves, a plurality of reversing valves, a plurality of proportional valves and a plurality of oil cylinders which are arranged in parallel, wherein the oil outlet end of the oil pump is respectively communicated with the compensation valves and the reversing valves through the pipelines, and the compensation valves and the reversing valves are communicated with the proportional valves through the pipelines;

the oil cylinder comprises a rod cavity and a rodless cavity, and the proportional valve is communicated with the rod cavity and the rodless cavity through pipelines respectively.

2. The pumping boom hydraulic system of claim 1, further comprising a first hydraulic lock, wherein the cylinder comprises a first cylinder, and wherein the proportional valve comprises a first proportional valve, and wherein the first hydraulic lock is disposed between the first cylinder and the first proportional valve.

3. The pumping boom hydraulic system of claim 2, wherein the directional valve comprises a first directional valve disposed between the oil pump and the first proportional valve, and the first directional valve is a two-position three-way electromagnetic directional valve.

4. The pumping boom hydraulic system of claim 3, wherein the first proportional valve is a three-position five-way solenoid directional valve.

5. The hydraulic system of the pumping boom as claimed in claim 4, wherein an unloading valve and an overflow valve are further arranged on a pipeline between the oil pump and the first proportional valve, and the unloading valve and the overflow valve are arranged in parallel.

6. The pumping boom hydraulic system of claim 5, further comprising a second cylinder juxtaposed to the first cylinder, the second cylinder having a structure identical to the first cylinder.

7. The hydraulic system of the pumping boom as claimed in claim 6, wherein a second hydraulic lock, a second proportional valve, a second compensating valve and a second reversing valve are arranged on a pipeline between the second cylinder and the oil pump.

8. The hydraulic system of the pumping boom according to claim 7, wherein the second hydraulic lock, the second proportional valve, the second compensating valve and the second reversing valve are respectively identical in structure to the first hydraulic lock, the first proportional valve, the first compensating valve and the first reversing valve, and are respectively arranged in the same manner as the first hydraulic lock, the first proportional valve, the first compensating valve and the first reversing valve.

9. The hydraulic system of a pumping boom according to claim 8, wherein the cylinders further comprise a third cylinder, a fourth cylinder, a fifth cylinder and a sixth cylinder, and the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder are respectively identical in structure and arrangement to the first cylinder;

the first oil cylinder, the second oil cylinder, the third oil cylinder, the fourth oil cylinder, the fifth oil cylinder and the sixth oil cylinder are all arm support oil cylinders.

10. An engineering machine comprises a vehicle body platform and a pumping boom hydraulic system arranged on the vehicle body platform, and is characterized in that the pumping boom hydraulic system is the pumping boom hydraulic system in any one of claims 1 to 9.

Technical Field

The invention relates to the field of engineering machinery, in particular to a hydraulic system of a pumping arm support and engineering machinery

Background

In recent years, with the continuous development of economy and science and technology, China has become a big country of engineering machinery, almost any kind of engineering machinery can be produced, such as concrete pump trucks, excavators, cranes and the like, and the yield among numerous products is the first in the world.

However, although the engineering machinery is a big country and great progress is made in these years, the engineering machinery is not strong, and key parts have problems of low localization rate, low competitiveness of products, low reliability and the like. Taking a concrete pump truck as an example, China still keeps a plurality of world records such as the world record of the length of the arm support, but generally speaking, the concrete pump truck has a series of problems of overlarge weight of the arm support, complex layout of pipelines of a hydraulic system, high production and use costs and the like.

In summary, how to provide a hydraulic system of a pumping boom, which can effectively simplify the pipeline layout and reduce the overall weight of the boom, and an engineering machine including the hydraulic system of the pumping boom, become technical problems to be solved by those skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the pumping boom hydraulic system can effectively simplify the pipeline layout and reduce the overall weight of the boom, and the engineering machinery comprising the pumping boom hydraulic system.

The solution of the invention is realized by the following steps: the invention provides a hydraulic system of a pumping arm support, which is characterized by comprising an oil pump, a plurality of pipelines, a plurality of compensating valves, a plurality of reversing valves, a plurality of proportional valves and a plurality of oil cylinders which are arranged in parallel, wherein the oil outlet end of the oil pump is respectively communicated with the compensating valves and the reversing valves through the pipelines, and the compensating valves and the reversing valves are communicated with the proportional valves through the pipelines; the oil cylinder comprises a rod cavity and a rodless cavity, and the proportional valve is communicated with the rod cavity and the rodless cavity through pipelines respectively. When the pumping boom hydraulic system with the structure works, pressure oil enters the pipeline from the oil outlet end of the oil pump, then enters the compensating valve, the reversing valve and the proportional valve, and finally enters the rod cavity or the rodless cavity of the oil cylinder.

In another technical scheme of the present invention, on the basis of the above, the hydraulic system of the pumping boom further includes a first hydraulic lock, the oil cylinder includes a first oil cylinder, the proportional valve includes a first proportional valve, and the first hydraulic lock is disposed between the first oil cylinder and the first proportional valve.

On the basis, the reversing valve comprises a first reversing valve arranged between the oil pump and the first proportional valve, and the first reversing valve is a two-position three-way electromagnetic reversing valve.

On the basis, the first proportional valve is a three-position five-way electromagnetic directional valve.

On the basis, an unloading valve and an overflow valve are further arranged on a pipeline between the oil pump and the first proportional valve, and the unloading valve and the overflow valve are arranged in parallel.

The other technical scheme of the invention is that on the basis, the hydraulic system of the pumping arm support further comprises a second oil cylinder arranged in parallel with the first oil cylinder, and the structure of the second oil cylinder is the same as that of the first oil cylinder.

On the basis, a second hydraulic lock, a second proportional valve, a second compensating valve and a second reversing valve are arranged on a pipeline between the second oil cylinder and the oil pump.

On the basis, the second hydraulic lock, the second proportional valve, the second compensation valve and the second reversing valve are respectively identical to the first hydraulic lock, the first proportional valve, the first compensation valve and the first reversing valve in structure, and the second hydraulic lock, the second proportional valve, the second compensation valve and the second reversing valve are respectively identical to the first hydraulic lock, the first proportional valve, the first compensation valve and the first reversing valve in arrangement mode.

On the basis, the oil cylinder further comprises a third oil cylinder, a fourth oil cylinder, a fifth oil cylinder and a sixth oil cylinder, wherein the third oil cylinder, the fourth oil cylinder, the fifth oil cylinder and the sixth oil cylinder are respectively identical in structure and arrangement mode with the first oil cylinder;

the first oil cylinder, the second oil cylinder, the third oil cylinder, the fourth oil cylinder, the fifth oil cylinder and the sixth oil cylinder are all arm support oil cylinders.

On the other hand, the invention further provides engineering machinery which comprises a vehicle body platform and a pumping arm support hydraulic system arranged on the vehicle body platform, wherein the pumping arm support hydraulic system is the pumping arm support hydraulic system.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic structural diagram of a hydraulic system of a pumping boom according to the present invention.

1 unloading valve, 2 oil pump and 3 overflow valve

4 first compensation valve 5 one-way valve 6 first reversing valve

7 first proportional valve 8 first hydraulic lock 9 first cylinder

10 second cylinder 11 third cylinder 12 fourth cylinder

13 fifth oil cylinder 14 sixth oil cylinder 15 vehicle body platform

16 line 17 tank 18 second compensation valve

19 second direction valve 20 second proportional valve 21 second hydraulic lock

Detailed Description

The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.

The embodiment of the invention is as follows, please refer to the hydraulic system of the pumping arm support shown in fig. 1, which specifically comprises an oil pump 2, a plurality of pipelines 16, a plurality of compensation valves, a plurality of reversing valves, a plurality of proportional valves and a plurality of oil cylinders arranged in parallel, wherein the oil pump 2 is driven by a motor to rotate and comprises an oil inlet end and an oil outlet end, the oil outlet end of the oil pump 2 is respectively communicated with the compensation valves and the reversing valves through the pipelines 16, and the compensation valves and the reversing valves are communicated with the proportional valves through the pipelines 16. The oil cylinder comprises a cylinder barrel, a rod cavity and a rodless cavity, wherein the rod cavity and the rodless cavity are arranged in the cylinder barrel, and the proportional valve is communicated with the rod cavity and the rodless cavity through a pipeline 16 respectively. When the pumping boom hydraulic system with the structure works, pressure oil enters the pipeline 16 from the oil outlet end of the oil pump 2, then enters the compensating valve, the reversing valve and the proportional valve, and finally enters the rod cavity or the rodless cavity of the oil cylinder.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the hydraulic system of the pumping boom further includes a first hydraulic lock 8, the cylinder includes a first cylinder 9, the proportional valve includes a first proportional valve 7, and the first hydraulic lock 8 is disposed between the first cylinder 9 and the first proportional valve 7.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the reversing valve includes a first reversing valve 6 disposed between the oil pump 2 and the first proportional valve 7, the first reversing valve 6 is a two-position three-way electromagnetic reversing valve, and the work position thereof can be changed in real time as required.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, for the first proportional valve 7, a three-position five-way electromagnetic directional valve is preferred.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, an unloading valve 1 and an overflow valve 3 are further disposed on a pipeline 16 between an oil pump 2 and a first proportional valve 7, the unloading valve 1 and the overflow valve 3 are disposed in parallel, and for the unloading valve 1, the overflow valve 3 and specific structures, reference may be made to the existing and improved technologies thereof, and details are not repeated herein.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the hydraulic system of the pumping boom further includes a second cylinder 10 arranged in parallel with the first cylinder 9, the second cylinder 10 has the same or similar structure as the first cylinder 9, and also includes a cylinder barrel, and a rod chamber and a rodless chamber arranged in the cylinder barrel, and the rod chamber and the rodless chamber are both provided with oil ports.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a second hydraulic lock 21, a second proportional valve 20, a second compensation valve 18 and a second direction valve 19 are disposed on the pipeline 16 between the second cylinder 10 and the oil pump 2.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the second hydraulic lock 21, the second proportional valve 20, the second compensation valve 18 and the second direction valve 19 are the same or similar in structure to the first hydraulic lock 8, the first proportional valve 7, the first compensation valve 4 and the first direction valve 6, respectively, and the second hydraulic lock 21, the second proportional valve 20, the second compensation valve 18 and the second direction valve 19 are arranged and connected in the same manner as the first hydraulic lock 8, the first proportional valve 7, the first compensation valve 4 and the first direction valve 6, respectively.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the oil cylinder further includes a third oil cylinder 11, a fourth oil cylinder 12, a fifth oil cylinder 13, and a sixth oil cylinder 14, and the third oil cylinder 11, the fourth oil cylinder 12, the fifth oil cylinder 13, and the sixth oil cylinder 14 are respectively the same in structure as the first oil cylinder 9, and are also the same in arrangement manner. The first oil cylinder 9, the second oil cylinder 10, the third oil cylinder 11, the fourth oil cylinder 12, the fifth oil cylinder 13 and the sixth oil cylinder 14 are all arm support oil cylinders. For the arrangement mode and other structures of the boom cylinder, reference may be made to the existing and improved technologies thereof, and further description is omitted here. In addition, the third oil cylinder 11, the fourth oil cylinder 12, the fifth oil cylinder 13 and the sixth oil cylinder 14 are also correspondingly provided with a compensating valve, a reversing valve, a proportional valve and the like which are matched with the third oil cylinder, and the specific arrangement mode can refer to the arrangement mode of the first oil cylinder 9, the first compensating valve 4, the first reversing valve 6 and the first proportional valve 7.

In addition, the hydraulic system further includes a plurality of check valves 5 disposed in the pipeline 16, and a tank 17, which are not described herein again, and the working principle thereof is as follows.

Taking the first oil cylinder 9 as an example, the oil pump 2 provides a pressure oil source, enters the first compensation valve 4, is unloaded through the unloading valve 1 when the first oil cylinder 9 does not work, so that the system is ensured to be in low-pressure operation, the overflow valve 3 protects the highest operating pressure of the system, and when the first oil cylinder 9 acts, the unloading valve 1, the first reversing valve 6 and the first proportional valve 7 work in a charged mode simultaneously. As long as any one boom cylinder needs to act, the electromagnetic valve needs to be electrified, the first proportional valve 7 is electrified to control the flow of oil liquid, and simultaneously the load is fed back to the first compensation valve 4, the pressure difference entering the first proportional valve 7 is consistent, the constant pressure difference is determined by a spring, the flow required by each valve is calibrated by adjusting the oil passing area of the first compensation valve 4, at the moment, the first proportional valve 7 adjusts the oil return area of the large cavity and the small cavity through proportional control, the speed of the first oil cylinder 9 is controlled, the first oil cylinder 9 is ensured not to have the phenomenon of air suction and zero gravity, the first reversing valve 6 directly returns the oil tank 17 when the first reversing valve 6 is at the middle position and is not communicated with the oil discharge of the main oil circuit, because the control oil of the first hydraulic lock 8 cannot have back pressure when the control oil is at the middle position, otherwise, the potential safety hazard of arm falling exists, the control oil of the first hydraulic lock 8 passes through the Y-type function of the first proportional valve 7 when the first proportional valve 7 does not work, and then, the oil return first reversing valve 6 directly and independently returns the oil tank 17, when the first reversing valve 16 and the first proportional valve 7 work, the first reversing valve 16 reverses proportionally to control the oil return area, and the throttling balance arm frame oil cylinder load is generated. Because the proportional control valve group is integrated with the first oil cylinder 9, the slave oil pump 2 only needs to provide high-pressure oil from the oil pump 2 to the first oil cylinder 9, the transition of the first oil cylinder 9 is completed through a tee joint or a valve block, a main oil return pipe of the arm support oil cylinder is provided, the transition of a plurality of arm support oil cylinders is completed through the tee joint or the valve block, the oil returns to the oil tank 17 system directly, the transition of a control signal unloading oil pipe and the arm support oil cylinder is completed through the tee joint or the valve block, the oil returns to the oil tank 17 system directly, and only three hydraulic pipelines 16 are arranged in the whole arm support control system. However, the existing main pump oil supply and power supply proportional multi-way valve is commonly used at home and abroad, oil ports of the multi-way valve are connected with a large cavity and a small cavity of an arm support oil cylinder, so that each arm support oil cylinder needs to be connected with two high-pressure pipelines 16 from the side of the multi-way valve, for example, an oil cylinder with 6 sections of arms, 12 high-pressure pipelines 16 need to be connected with the multi-way valve of a vehicle body platform 15, the length of the average pipeline 16 reaches 2 × 10+2 × 20+2 × 30+2 × 40+2 × 50+2 × 60, which is 420 meters, and the existing main pump oil supply and power supply proportional multi-way valve does not include high-pressure rubber pipes from the multi-way valve to the arm support, and the number of the high-pressure rubber pipes is 12. The distributed load-sensitive electric proportional pumping arm support system only needs one high-pressure pipeline 16 with the length of 60 meters, one oil return pipeline 16 with the length of 60 meters and one oil return pipeline 16 with the diameter of 60 meters 06. Therefore, the layout of the pipeline 16 is greatly simplified, and the weight of the arm support is reduced.

On the other hand, the invention further provides engineering machinery which comprises a vehicle body platform 15 and a pumping arm support hydraulic system arranged on the vehicle body platform 15, wherein the pumping arm support hydraulic system is the pumping arm support hydraulic system.

The engineering machinery with the structure correspondingly has the advantages of the pumping boom hydraulic system, namely, the pipelines are simplified, the whole weight is smaller, the production and use cost is lower, and the like.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.