Hydraulic system, pile driver, and engineering machinery

Abstract

The present invention discloses a hydraulic system, a pile driver, and engineering machinery, and relates to the field of hydraulic control technology. The hydraulic system includes a multi-way valve, a hydraulic variable pump group, and a flow sharing valve; the multi-way valve is provided with a first oil inlet and a first oil outlet; the hydraulic variable pump group is provided with a second oil outlet and a control oil outlet, and the first oil outlet is connected to the first oil inlet; the flow sharing valve is provided with a second oil inlet, a third oil inlet, and a third oil outlet; the first oil outlet is connected to the second oil inlet, and the third oil outlet is connected to the control oil outlet, and part of the hydraulic oil output from the second oil outlet enters the multi-way valve from the first oil inlet, and the other part enters the flow sharing valve from the third oil inlet. The flow of the hydraulic oil refluxed to the control oil flow is significantly increased, and without undergoing the decompression process inside the multi-way valve, the pressure of the hydraulic oil refluxed to the control oil outlet is more stable, which can effectively shorten the delay time.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic control technology, and more specifically, to a hydraulic system. In addition, the present invention also relates to a pile driver including the hydraulic system and an engineering machine including the hydraulic system. Background Art

[0002] At present, the boring device of the boring pile machine used for precast pile construction is located at a high position, the multi-way valve is installed on the boring platform, and the hydraulic variable pump group is installed on the pile driving platform. The control pipeline distance between the multi-way valve and the hydraulic variable pump group is long, resulting in a delay of about 3 to 5 seconds in the variable response of the hydraulic variable pump group after the multi-way valve group is actuated. As the distance increases, the delay will further increase, seriously affecting the control performance of the whole machine.

[0003] In summary, how to provide a hydraulic system that can effectively reduce delay is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a hydraulic system, which, by setting a flow sharing valve, makes the hydraulic oil flow returning to the control oil port more sufficient, shortens the time returning to the control oil port, and effectively shortens the delay time.

[0005] Another object of the present invention is to provide a pile driver including the hydraulic system and an engineering machine including the hydraulic system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A hydraulic system comprising:

[0008] A multi-way valve is used to supply oil to the load; the multi-way valve is provided with a first oil inlet and a first oil outlet;

[0009] A hydraulic variable pump group is provided with a second oil outlet and a control oil port, wherein the first oil outlet is connected to the first oil inlet; the hydraulic variable pump group is used to supply oil to the multi-way valve;

[0010] The flow sharing valve is provided with a second oil inlet, a third oil inlet and a third oil outlet;

[0011] The first oil outlet is connected to the second oil inlet, the third oil outlet is connected to the control oil port, part of the hydraulic oil output from the second oil outlet enters the multi-way valve through the first oil inlet, and the other part enters the flow sharing valve through the third oil inlet.

[0012] Optionally, the multi-way valve is provided with an overflow port connected to the first oil inlet, and the overflow port is connected to the third oil inlet, so that part of the hydraulic oil entering the first oil inlet enters the interior of the multi-way valve, and the other part enters the flow sharing valve through the overflow port.

[0013] Optionally, the second oil outlet is connected to the first oil inlet via a main pipeline, the main pipeline is provided with a branch pipeline, and the branch pipeline is connected to the third oil inlet;

[0014] Part of the hydraulic oil output from the second oil outlet enters the multi-way valve through the first oil inlet via the main pipeline, and the other part enters the flow sharing valve through the third oil inlet via the branch pipeline.

[0015] Optionally, a flow distribution valve, a first detection component for detecting the flow of the branch pipeline, and a second flow detection component for detecting the flow in the main pipeline connected to the first oil inlet are provided at the connection between the main pipeline and the branch pipeline.

[0016] Optionally, the first oil outlet and the second oil inlet are connected via a hose.

[0017] Optionally, the flow sharing valve is a two-position three-way control valve.

[0018] Optionally, the flow sharing valve is arranged adjacent to the multi-way valve.

[0019] A pile driver comprises a load and any one of the hydraulic systems described above.

[0020] Optionally, the load includes a slewing motor, a pressurized winch, a horizontal lifting cylinder, a first luffing cylinder, a second luffing cylinder and a goose head cylinder.

[0021] An engineering machine comprises any one of the hydraulic systems described above.

[0022] During use of the hydraulic system provided by the present invention, part of the hydraulic oil output by the hydraulic variable pump group enters the multi-way valve through the second oil outlet and the first oil inlet, and the other part enters the flow sharing valve through the third oil inlet. The hydraulic oil flowing through the multi-way valve flows out of the multi-way valve and then enters the flow sharing valve through the first oil outlet. The hydraulic oil entering through the second oil inlet and the hydraulic oil entering through the third oil inlet act on the flow sharing valve together, and the hydraulic oil in the flow sharing valve flows out to the control oil port through the third oil outlet.

[0023] In the hydraulic system provided by the present invention, part of the hydraulic oil flowing out from the second oil outlet enters the flow sharing valve, and compared with the hydraulic oil that previously flows through the interior of the multi-way valve and then flows back to the control oil port, the flow rate of the hydraulic oil flowing back to the control oil port is significantly increased, and without undergoing the decompression process inside the multi-way valve, the pressure of the hydraulic oil flowing back to the control oil port is more stable, which can effectively shorten the time for the hydraulic oil to flow back to the control oil port and effectively shorten the delay time.

[0024] In addition, the present invention also provides a pile driver including the hydraulic system and an engineering machine including the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a specific embodiment of the hydraulic system provided by the present invention.

[0027] Figure 1 middle:

[0028] 1 is the return oil circuit, 2 is the flow sharing valve, 3 is the hose, 4 is the overflow pipeline, 5 is the multi-way valve, 6 is the main pipeline, and 7 is the hydraulic variable pump group. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The core of the present invention is to provide a hydraulic system. By setting a flow sharing valve, the flow of hydraulic oil returning to the control oil port is more sufficient, the time for returning to the control oil port is shortened, and the delay time can be effectively shortened.

[0031] Another object of the present invention is to provide a pile driver including the hydraulic system and an engineering machine including the hydraulic system.

[0032] In a specific embodiment, the hydraulic system includes a multi-way valve 5, a hydraulic variable pump group 7 and a flow sharing valve 2, wherein the multi-way valve 5 is used to supply oil to the load; the multi-way valve 5 is provided with a first oil inlet and a first oil outlet; the hydraulic variable pump group 7 is provided with a second oil outlet and a control oil outlet, and the first oil outlet is connected to the first oil inlet; the hydraulic variable pump group 7 is used to supply oil to the multi-way valve 5; the flow sharing valve 2 is provided with a second oil inlet, a third oil inlet and a third oil outlet; the first oil outlet is connected to the second oil inlet, and the third oil outlet is connected to the control oil port, and part of the hydraulic oil output from the second oil outlet enters the multi-way valve 5 from the first oil inlet, and the other part enters the flow sharing valve 2 from the third oil inlet.

[0033] It should be noted that when the flow sharing valve 2 is not set, in the actual assembly process, due to the equipment structure, the distance between the hydraulic variable pump group 7 and the multi-way valve 5 is generally far. In actual use, when the hydraulic oil returns to the control oil port, the hydraulic oil flowing through the return oil circuit undergoes a decompression process inside the multi-way valve 5, the flow rate of the hydraulic oil is reduced, and the pressure of the hydraulic oil is reduced, which will increase the time for the hydraulic oil to return to the control oil port, thereby delaying the control of the hydraulic variable pump group 7 and affecting work efficiency.

[0034] In this specific embodiment, a flow sharing valve 2 is provided. During actual use, part of the hydraulic oil output by the hydraulic variable pump group 7 enters the multi-way valve 5 through the second oil outlet and the first oil inlet, and the other part enters the flow sharing valve 2 through the third oil inlet. The hydraulic oil flowing through the multi-way valve 5 flows out of the multi-way valve 5 and then enters the flow sharing valve 2 through the first oil outlet. The hydraulic oil entering through the second oil inlet and the hydraulic oil entering through the third oil inlet act on the flow sharing valve 2 together, and the hydraulic oil in the flow sharing valve 2 flows out to the control oil port through the third oil outlet and the reflux oil circuit 1.

[0035] The hydraulic system provided by this specific embodiment is heavy, and part of the hydraulic oil flowing out from the second oil outlet enters the flow sharing valve 2. Compared with the hydraulic oil that previously flows through the multi-way valve 5 and then flows back to the control oil port, the flow rate of the hydraulic oil flowing back to the control oil flow is significantly increased, and the pressure of the hydraulic oil flowing back to the control oil port is more stable without undergoing the decompression process inside the multi-way valve 5, which can effectively shorten the time for the hydraulic oil to flow back to the control oil port and effectively shorten the delay time.

[0036] Based on the above embodiments, Figure 1 As shown, an overflow port connected to the first oil inlet can be set in the multi-way valve 5, and the overflow port is connected to the third oil inlet. Part of the hydraulic oil entering the first oil inlet enters the multi-way valve 5, and the other part enters the flow sharing valve 2 through the overflow port.

[0037] In the present specific embodiment, since the hydraulic oil entering the first oil inlet cannot all enter the interior of the multi-way valve 5, in actual use, an overflow port is provided in the multi-way valve 5, and the overflow port is connected to the third oil inlet through an overflow pipe 4, so that part of the hydraulic oil enters the third oil inlet through the overflow port. This part of the hydraulic oil does not flow through the interior of the multi-way valve 5 and does not undergo a decompression process. Therefore, after entering the flow sharing valve 2, the flow and pressure of the hydraulic oil returning to the control oil port can be effectively guaranteed.

[0038] On the other hand, in this specific embodiment, by setting an overflow port in the multi-way valve 5, the supply of internal hydraulic oil of the multi-way valve 5 can be effectively guaranteed. Only the hydraulic oil not needed by the multi-way valve 5 will flow out from the overflow port, which can effectively ensure the hydraulic oil flow of the load connected to the multi-way valve 5.

[0039] In a specific embodiment, the second oil outlet can also be connected to the first oil inlet through the main line 6, and the main line 6 is provided with a branch line, and the branch line is connected to the third oil inlet; part of the hydraulic oil output from the second oil outlet enters the multi-way valve 5 from the first oil inlet through the main line 6, and the other part enters the flow sharing valve 2 from the third oil inlet through the branch line.

[0040] During actual use, part of the hydraulic oil output from the second oil outlet enters the first oil inlet through the main line 6, and the other part enters the third oil inlet of the flow sharing valve 2 through the branch line. Furthermore, a flow distribution valve, a first detection component for detecting the flow of the branch line, and a second flow detection component for detecting the flow at the end connected to the first oil inlet in the main line 6 can be set at the connection between the main line 6 and the branch line.

[0041] During actual use of the hydraulic system provided in this specific embodiment, the opening of the flow distribution valve can be adjusted according to actual needs and the flow values ​​detected by the first flow detection component and the second flow detection component to ensure reasonable flow distribution of the multi-way valve 5 and the flow sharing valve 2.

[0042] Specifically, when the flow information detected by the second flow detection component is lower than the first preset flow value, it is necessary to control the flow distribution valve to increase the flow entering the main line 6. When the flow information detected by the second flow detection component is lower than the first preset flow value and the flow information detected by the second flow detection component is lower than the second preset flow value, it is necessary to control the hydraulic variable pump group 7 to increase the speed of the variable pump and increase the supply of hydraulic oil.

[0043] Based on the above embodiments, Figure 1 As shown, the first oil outlet and the second oil inlet can be connected via the hose 3. To further shorten the length of the hose 3, the flow sharing valve 2 and the multi-way valve 5 can be disposed adjacent to each other.

[0044] On the other hand, Figure 1 As shown, the flow sharing valve 2 can be set as a two-position three-way control valve. Of course, the flow sharing valve 2 can also be other valve body structures that meet the requirements, which are determined according to actual conditions and will not be elaborated here.

[0045] In addition to the above hydraulic system, the present invention also provides a pile driver including a load and the hydraulic system disclosed in the above embodiment. For the structures of other parts of the pile driver, please refer to the prior art and will not be described in detail herein.

[0046] It should be noted that the load mentioned in this specific embodiment may include a slewing motor, a pressure winch, a horizontal lifting cylinder, a first luffing cylinder, a second luffing cylinder and a goose head cylinder; of course, depending on the structure of the boring pile driver, the load can also be set to other structures, which is determined according to actual conditions and will not be elaborated here.

[0047] In addition to the above-mentioned hydraulic system, the present invention also provides an engineering machinery including the hydraulic system disclosed in the above-mentioned embodiment. For the structures of other parts of the engineering machinery, please refer to the prior art and will not be described in detail herein.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0049] The hydraulic system, pile driver, and construction machinery provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic system, characterized in that: include: The multi-way valve (5) is used to supply oil to the load; the multi-way valve (5) is provided with a first oil inlet and a first oil outlet; A hydraulic variable pump group (7) is provided with a second oil outlet and a control oil port, wherein the first oil outlet is connected to the first oil inlet; the hydraulic variable pump group (7) is used to supply oil to the multi-way valve (5); A flow sharing valve (2) is provided with a second oil inlet, a third oil inlet and a third oil outlet; The first oil outlet is connected to the second oil inlet, the third oil outlet is connected to the control oil port, part of the hydraulic oil outputted from the second oil outlet enters the multi-way valve (5) through the first oil inlet, and the other part enters the flow sharing valve (2) through the third oil inlet; The multi-way valve (5) is provided with an overflow port connected to the first oil inlet, the overflow port is connected to the third oil inlet, part of the hydraulic oil entering the first oil inlet enters the interior of the multi-way valve (5), and the other part enters the flow sharing valve (2) through the overflow port.

2. The hydraulic system according to claim 1, characterized in that: The second oil outlet is connected to the first oil inlet via a main pipeline (6), the main pipeline (6) is provided with a branch pipeline, and the branch pipeline is connected to the third oil inlet; Part of the hydraulic oil output from the second oil outlet enters the multi-way valve (5) from the first oil inlet via the main pipeline (6), and the other part enters the flow sharing valve (2) from the third oil inlet via the branch pipeline.

3. The hydraulic system according to claim 2, characterized in that: The connection between the main pipeline (6) and the branch pipeline is provided with a flow distribution valve, a first detection element for detecting the flow of the branch pipeline, and a second flow detection element for detecting the flow of the main pipeline (6) at the end connected to the first oil inlet.

4. The hydraulic system according to any one of claims 1 to 3, characterized in that: The first oil outlet and the second oil inlet are connected via a rubber hose (3).

5. The hydraulic system according to any one of claims 1 to 3, characterized in that: The flow sharing valve (2) is a two-position three-way control valve.

6. The hydraulic system according to any one of claims 1 to 3, characterized in that: The flow sharing valve (2) is arranged adjacent to the multi-way valve (5).

7. A pile driver, characterized in that: Comprising a load and the hydraulic system according to any one of claims 1 to 6.

8. The pile driver according to claim 7, characterized in that: The load includes a slewing motor, a pressurized winch, a horizontal lifting cylinder, a first luffing cylinder, a second luffing cylinder and a goose head cylinder.

9. An engineering machine, characterized in that: A hydraulic system comprising any one of claims 1-6.

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