Control valve assembly for engineering machinery and engineering machinery having the same

Abstract

The present invention provides a control valve assembly of an engineering machinery and an engineering machinery having the same, wherein the control valve assembly includes a first control valve, including a first valve body and a first valve core, the first valve body is provided with an oil inlet, an oil outlet, a first working oil port and a second working oil port, the first valve core is provided with an oil inlet connecting groove and an oil outlet connecting groove; a first throttling structure is arranged outside the first valve core, the first throttling structure is connected with the oil inlet or the oil outlet; a second throttling structure, when the first throttling structure is connected with the oil inlet, the second throttling structure is arranged on the oil outlet connecting groove, when the second throttling structure is connected with the oil outlet, the second throttling structure is arranged on the oil inlet connecting groove. The technical solution of the present invention solves the defect of poor control flexibility of the control valve of the engineering machinery in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of excavator equipment, and in particular to a control valve assembly of an engineering machinery and an engineering machinery having the control valve assembly. Background Art

[0002] At present, most construction machinery transmissions are driven by hydraulics, among which hydraulic excavators realize excavation and unloading through single or compound actions of boom, dipper rod, bucket and rotation. The operator operates the pilot handle in the cab to switch the main valve core. During the switching process of the main valve core, the hydraulic oil pumped out is supplied to the working device through the oil inlet opening of the valve core, and the return oil from the working device is discharged to the oil tank through the oil return opening of the valve core. There are various opening grooves on the valve core. Different opening grooves can form different opening areas with the valve body during movement, so that the flow entering the working device can be controlled, thereby controlling the speed of the excavator's movement.

[0003] In the prior art, the conventional valve core oil inlet opening groove and oil return opening groove are both arranged on a main valve core and rigidly connected. When the pilot pressure pushes the valve core, the valve core moves and the oil inlet opening and oil return opening change synchronously. There is no way to arbitrarily change the opening area of ​​the valve core oil inlet and oil return ports, resulting in poor control flexibility of the control valve. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor control flexibility of the control valve of the engineering machinery in the prior art, so as to provide a control valve assembly of the engineering machinery and the engineering machinery having the same.

[0005] In order to solve the above problems, the present invention provides a control valve assembly of an engineering machinery, comprising: a first control valve, comprising a first valve body and a first valve core, the first valve body is provided with an oil inlet, an oil outlet, a first working oil port and a second working oil port, the first working oil port and the second working oil port are suitable for being connected to the control oil cylinder of the engineering machinery, the first valve core is provided with an oil inlet connecting groove and an oil outlet connecting groove, the oil inlet connecting groove is suitable for connecting the oil inlet with one of the first working oil port and the second working oil port, and the oil outlet connecting groove is suitable for connecting the oil outlet with the other of the first working oil port and the second working oil port; a first throttling structure is arranged on the outside of the first valve core, the first throttling structure is connected with the oil inlet or the oil outlet; a second throttling structure, when the first throttling structure is connected with the oil inlet, the second throttling structure is arranged on the oil outlet connecting groove, when the second throttling structure is connected with the oil outlet, the second throttling structure is arranged on the oil inlet connecting groove.

[0006] Optionally, the control valve assembly also includes a second control valve, the second control valve includes a second valve body and a second valve core, the second valve body is provided with a third working oil port and a fourth working oil port, the third working oil port is connected to the oil inlet or the oil outlet, the second valve core is provided with a flow groove, the flow groove connects the third working oil port and the fourth working oil port, and the first throttling structure is a first throttling groove arranged on the flow groove.

[0007] Optionally, the third working oil port is communicated with the oil inlet, and the fourth working oil port is communicated with the main oil circuit.

[0008] Optionally, a one-way flow structure is provided between the third working oil port and the oil inlet.

[0009] Optionally, the first valve body and the second valve body are an integral structure.

[0010] Optionally, the first valve body and the second valve body are connected via an external pipeline.

[0011] Optionally, the second throttling structure is a second throttling groove arranged on the oil discharge connecting groove.

[0012] Optionally, there are two oil drain connecting grooves, which are respectively arranged on both sides of the oil inlet connecting groove, and the second throttling groove is arranged on both oil drain connecting grooves.

[0013] Optionally, the first control valve and / or the second control valve is an electrically controlled reversing valve.

[0014] The present invention also provides an engineering machine, comprising the control valve assembly of the engineering machine mentioned above.

[0015] The present invention has the following advantages:

[0016] By utilizing the technical solution of the present invention, the oil inlet (or oil discharge) throttling amount of the first control valve can be adjusted through the first throttling structure. By adjusting the position of the first valve core in the first valve body, the oil discharge (or oil inlet) throttling amount of the first control valve can be adjusted through the second throttling structure. Therefore, the above structure can independently adjust the oil inlet throttling amount and the oil discharge throttling amount of the first control valve, and can be combined arbitrarily, which greatly improves the control flexibility of the control valve assembly. Therefore, the technical solution of the present invention solves the defect of poor control flexibility of the control valve of the engineering machinery in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic cross-sectional view of a control valve assembly of an engineering machine according to the present invention is shown; and

[0019] Figure 2 Shows Figure 1 Schematic diagram of the control valve assembly.

[0020] Description of reference numerals:

[0021] 10. First control valve; 11. First valve body; 111. Oil inlet; 112. Oil outlet; 113. First working oil port; 114. Second working oil port; 12. First valve core; 13. Oil inlet connecting groove; 14. Oil outlet connecting groove; 20. First throttling structure; 30. Second throttling structure; 40. Second control valve; 41. Second valve body; 411. Third working oil port; 412. Fourth working oil port; 42. Second valve core; 43. Flow groove; 50. One-way flow structure; 100. Control cylinder. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 and Figure 2 As shown, the control valve assembly of the engineering machinery of this embodiment includes a first control valve 10, a first throttling structure 20 and a second throttling structure 30. The first control valve 10 includes a first valve body 11 and a first valve core 12. The first valve body is provided with an oil inlet 111, an oil outlet 112, a first working oil port 113 and a second working oil port 114, and the first working oil port 113 and the second working oil port 114 are suitable for connecting with the control oil cylinder 100 of the engineering machinery. The first valve core 12 is provided with an oil inlet connecting groove 13 and an oil outlet connecting groove 14, and the oil inlet connecting groove 13 is suitable for connecting the oil inlet 111 with one of the first working oil port 113 and the second working oil port 114, and the oil outlet connecting groove 14 is suitable for connecting the oil outlet 112 with the other of the first working oil port 113 and the second working oil port 114. The first throttling structure 20 is arranged outside the first control valve 10, and the first throttling structure 20 is connected with the oil inlet 111 or the oil outlet 112. The second throttling structure 30 is arranged in such a manner that when the first throttling structure is connected to the oil inlet 111, the second throttling structure 30 is arranged on the oil discharge connecting groove 14. When the second throttling structure 30 is connected to the oil discharge port 112, the second throttling structure 30 is arranged on the oil inlet connecting groove 13.

[0027] By using the technical solution of this embodiment, the oil inlet (or oil discharge) throttling amount of the first control valve 10 can be adjusted through the first throttling structure 20. By adjusting the position of the first valve core 12 in the first valve body 11, the oil discharge (or oil inlet) throttling amount of the first control valve 10 can be adjusted through the second throttling structure 30. Therefore, the above structure can independently adjust the oil inlet throttling amount and the oil discharge throttling amount of the first control valve 10, and can be combined arbitrarily, which greatly improves the control flexibility of the control valve assembly. Therefore, the technical solution of this embodiment solves the defect of poor control flexibility of the control valve of the engineering machinery in the prior art.

[0028] It should be noted that the connection between the first working oil port 113 and the second working oil port 114 and the control oil cylinder 100 of the engineering machinery means that the control oil cylinder 100 includes a rodless chamber and a rod chamber, one of the first working oil port 113 and the second working oil port 114 is connected to the rodless chamber, and the other is connected to the rod chamber, so as to control the extension and retraction of the control oil cylinder 100. Figure 1 and Figure 2 It can be seen that the first working oil port 113 is communicated with the rodless chamber of the control oil cylinder 100 , and the second working oil port 114 is communicated with the rod chamber of the control oil cylinder 100 .

[0029] It should be noted that the meaning of the above “the oil inlet connecting groove 13 is suitable for connecting the oil inlet port 111 with one of the first working oil port 113 and the second working oil port 114, and the oil discharge connecting groove 14 is suitable for connecting the oil discharge port 112 with the other of the first working oil port 113 and the second working oil port 114” is as follows: Figure 2 It can be seen that the first control valve 10 is a reversing valve, so the first valve core 12 has different gears in the first valve body 11. The function of the oil inlet connecting groove 13 and the oil outlet connecting groove 14 is to change the connection state between the oil inlet port 111, the oil outlet port 112, the first working oil port 113 and the second working oil port 114 when the first valve core 12 is in different gears. Figure 2 It can be seen that when the first valve core 12 is in the left position, the oil inlet connecting groove 13 connects the oil inlet port 111 and the first working oil port 113, and the oil discharge connecting groove 14 connects the oil discharge port 112 and the second working oil port 114. At this time, the rodless chamber of the control cylinder 100 is inlet, and the rod chamber is drained, so that the piston rod is extended. When the first valve core 12 is in the right position, the oil inlet connecting groove 13 connects the oil inlet port 111 and the second working oil port 114, and the oil discharge connecting groove 14 connects the oil discharge port 112 and the first working oil port 113. At this time, the rod chamber of the control cylinder 100 is inlet, and the rodless chamber is drained, so that the piston rod is retracted.

[0030] It should be noted that the first throttling structure 20 is arranged outside the first valve core 12, which means that the first throttling structure 20 is not arranged on the first valve core 12, that is, the first throttling structure 20 can play a throttling control role independently relative to the second throttling structure 30. Specifically, the first throttling structure 20 can be arranged at the oil inlet 111 or the oil outlet 112 of the first valve body 11, or the first throttling structure 20 is arranged outside the first control valve 10, and is connected to the oil inlet 111 or the oil outlet 112 on the first valve body 11 through structures such as pipelines and channels.

[0031] It should be noted that there are two ways to set the first throttling structure 20 and the second throttling structure 30. The first way is that the first throttling structure 20 is connected to the oil inlet 111, and the second throttling structure is set on the oil discharge connecting groove 14. Those skilled in the art can understand that when the first throttling structure 20 is connected to the oil inlet 111, the oil inlet flow of the first control valve 10 is regulated by the first throttling structure 20, and when the second throttling structure is set on the oil discharge connecting groove 14, the oil discharge flow of the first control valve 10 is regulated by the second throttling structure 30. The other way is that the first throttling structure 20 is connected to the oil discharge port 112, and the second throttling structure is set on the oil inlet connecting groove 13. Those skilled in the art can understand that when the first throttling structure 20 is connected to the oil discharge port 112, the oil discharge flow of the first control valve 10 is regulated by the first throttling structure 20, and when the second throttling structure is set on the oil inlet connecting groove 13, the oil inlet flow of the first control valve 10 is regulated by the second throttling structure 30. The above two configurations can both achieve the technical effect of independently adjusting the oil inlet flow rate and the oil outlet flow rate of the first control valve 10 .

[0032] As Figure 1 and Figure 2 As shown, the control valve assembly also includes a second control valve 40. The second control valve 40 includes a second valve body 41 and a second valve core 42. The second valve body 41 is provided with a third working oil port 411 and a fourth working oil port 412. The third working oil port 411 is connected to the oil inlet 111 or the oil outlet 112. The second valve core 42 is provided with a flow groove 43, which connects the third working oil port 411 and the fourth working oil port 412. The first throttling structure 20 is a first throttling groove provided on the flow groove 43. Specifically, from Figure 2 It can be seen that the second control valve 40 is a reversing valve. When the position of the second valve core 42 in the second valve body 41 changes, the first throttling groove can change the flow area between the third working oil port 411 and the fourth working oil port 412, thereby achieving a throttling effect. When the third working oil port 411 is connected to the oil inlet 111, the second control valve 40 has a throttling effect on the oil inlet flow of the first control valve 10. When the third working oil port 411 is connected to the oil outlet 112, the second control valve 40 has a throttling effect on the oil outlet flow of the first control valve 10.

[0033] It should be noted that the first throttling structure 20 is not limited to the above-mentioned throttling groove structure set on the valve core. Those skilled in the art can understand that the first throttling structure 20 can be any mechanism in the prior art that can throttle the fluid in the pipeline, such as a valve, a flow limiting valve, etc.

[0034] like Figure 1As shown, in the technical solution of this embodiment, the third working oil port 411 is connected to the oil inlet 111, and the fourth working oil port 412 is connected to the main oil circuit. Specifically, before the hydraulic oil in the main oil circuit enters the first control valve 10, it first enters the second control valve 40, and is throttled by the first throttling structure 20, thereby achieving the function of regulating the oil inlet flow of the first control valve 10. Of course, according to the above content, those skilled in the art can understand that the third working oil port 411 can also be connected to the oil discharge port 112. At this time, the oil discharge of the first control valve 10 first passes through the second control valve 40, and through the throttling effect of the first throttling structure 20, it returns to the external oil tank, thereby achieving the function of regulating the oil discharge flow of the first control valve 10.

[0035] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, a one-way flow structure 50 is provided between the third working oil port 411 and the oil inlet 111. Specifically, in the second control valve 40, the flow direction of the hydraulic oil is from the fourth working oil port 412 to the third working oil port 411, so the one-way flow structure 50 is configured to allow the hydraulic oil to flow in one direction from the third working oil port 411 to the oil inlet 111, thereby preventing the backflow of the hydraulic oil. Of course. Those skilled in the art can understand that when the third working oil port 411 is connected to the oil discharge port 112, the flow direction of the hydraulic oil is from the third working oil port 411 to the fourth working oil port 412, so the one-way flow structure 50 is configured to allow the hydraulic oil to flow in one direction from the oil discharge port 112 to the third working oil port 411.

[0036] like Figure 1 As shown, in the technical solution of this embodiment, the first valve body 11 and the second valve body 41 are an integrated structure. Specifically, in this embodiment, the first valve body 11 and the second valve body 41 are connected together to form an integrated valve body structure. The upper half of the valve body is provided with the relevant structure and control port of the first control valve 10, and the lower half of the valve body is provided with the relevant structure and control port of the second control valve 40. Figure 1 It can be seen that the oil inlet 111 of the first valve body 11 and the third working oil port 411 of the second valve body 41 are connected through a pipeline.

[0037] It should be noted that the above-mentioned “the first valve body 11 and the second valve body 41 are an integral structure” includes both the case where the two are integrally formed (cast), and the case where the two are connected together by multiple parts through fasteners, adhesives, welding, etc.

[0038] Of course, the arrangement of the first valve body 11 and the second valve body 41 is not limited to the above-mentioned arrangement. For example, the first valve body 11 and the second valve body 41 are connected by an external pipeline. In this embodiment not shown, the first valve body 11 and the second valve body 41 are split structures, that is, the first control valve 10 and the second control valve 40 are independently arranged. When the second control valve 40 needs to throttle the oil inlet flow of the first control valve 10, the third working oil port 411 is connected to the oil inlet port 111 through a pipeline. When the second control valve 40 needs to throttle the oil discharge flow of the first control valve 10, the third working oil port 411 is connected to the oil discharge port 112 through a pipeline.

[0039] like Figure 1 As shown, in the technical solution of this embodiment, the second throttling structure 30 is a second throttling groove arranged on the oil discharge connecting groove 14. Specifically, when the position of the first valve core 12 in the first valve body 11 changes, the second throttling groove can change the oil return opening area of ​​the oil discharge connecting groove 14, thereby adjusting the oil return flow rate.

[0040] like Figure 1 As shown, in the technical solution of this embodiment, there are two oil discharge connecting grooves 14, and the two oil discharge connecting grooves 14 are respectively arranged on both sides of the oil inlet connecting groove 13, and the two oil discharge connecting grooves 14 are both provided with a second throttling groove. Specifically, the two oil discharge connecting grooves 14 are respectively used to connect the first working oil port 113 with the oil discharge port 112 and the second working oil port 114 with the oil discharge port 112 when the first valve core 12 is in different gears. Of course, those skilled in the art can understand that when the second throttling structure 30 (i.e., the second throttling groove) is arranged on the oil inlet connecting groove 13, the second throttling structure 30 is not arranged on the two oil discharge connecting grooves 14.

[0041] like Figure 1 and Figure 2 As shown, in the technical solution of this embodiment, the first control valve 10 and the second control valve 40 are electrically controlled reversing valves. Specifically, in this embodiment, the first control valve 10 is a three-position four-way reversing valve. Among them, the left position and the right position of the first control valve 10 are working gear positions (as described above, and will not be repeated here), and the middle position is the cut-off gear position. The second control valve 40 is a two-position two-way reversing valve, and Figure 2 It can be seen that when the second control valve 40 is in the left position, the first throttling structure 20 does not have a throttling effect, and when the second control valve 40 is in the right position, the first throttling structure 20 has a throttling effect on the oil inlet (or oil return). The electric control ends of the first control valve 10 and the second control valve 40 are controlled by the ECU system, thereby controlling the gear shift of the two. Of course, the first control valve 10 and the second control valve 40 are not limited to the above-mentioned forms, and the technical personnel in this field can adaptively adjust and change the specific structures of the two according to actual work needs.

[0042] This embodiment also provides an engineering machine, which includes the above-mentioned control valve assembly. Preferably, the engineering machine in this embodiment is an excavator, and the control valve assembly can control the movement of the boom, dipper arm, bucket and turntable of the excavator. Of course, those skilled in the art can understand that other engineering machines, such as cranes, rotary drilling rigs, etc., can all be controlled by the above-mentioned control valve assembly. At the same time, any engineering machine driven by hydraulic pressure can be controlled by the above-mentioned control valve assembly.

[0043] According to the above structure, the control valve assembly of this embodiment has the following advantages:

[0044] The structure of this embodiment controls the flow to the control cylinder through a combination of dual main valve cores, which simplifies the structure of the valve core and shortens the length of the valve core. The second valve core adopts a simple two-position two-way structure, and the first valve core adopts a simple three-position four-way structure. The structure of this embodiment can improve the control accuracy of the dual main valve cores, and the main valve cores are adjusted separately by program-controlled solenoid valves, which greatly improves the flexibility of control, facilitates electronic control debugging, reduces the number of main valve core trial production, and can achieve more precise control of the excavator.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A control valve assembly for engineering machinery, characterized in that: include; A first control valve (10) comprises a first valve body (11) and a first valve core (12); the first valve body (11) is provided with an oil inlet (111), an oil outlet (112), a first working oil port (113) and a second working oil port (114); the first working oil port (113) and the second working oil port (114) are suitable for being connected to a control oil cylinder (100) of an engineering machine; the first valve core (12) is provided with an oil inlet connecting groove (13) and an oil outlet connecting groove (14); the oil inlet connecting groove (13) is suitable for connecting the oil inlet (111) with one of the first working oil port (113) and the second working oil port (114); the oil outlet connecting groove (14) is suitable for connecting the oil outlet (112) with the other of the first working oil port (113) and the second working oil port (114); A first throttling structure (20) is arranged outside the first valve core (12), the first throttling structure (20) being in communication with the oil inlet (111) or the oil outlet (112); a second throttling structure (30), wherein when the first throttling structure (20) is in communication with the oil inlet (111), the second throttling structure (30) is arranged on the oil discharge connecting groove (14); and when the first throttling structure (20) is in communication with the oil discharge port (112), the second throttling structure (30) is arranged on the oil inlet connecting groove (13); The control valve assembly further comprises a second control valve (40), the second control valve (40) comprising a second valve body (41) and a second valve core (42), the second valve body (41) being provided with a third working oil port (411) and a fourth working oil port (412), the third working oil port (411) being communicated with the oil inlet (111) or the oil outlet (112), the second valve core (42) being provided with a flow groove (43), the flow groove (43) being communicated with the third working oil port (411) and the fourth working oil port (412), and the first throttling structure (20) being a first throttling groove arranged on the flow groove (43); The first control valve (10) is a three-position four-way reversing valve, and the second control valve (40) is a two-position two-way reversing valve.

2. The control valve assembly according to claim 1, characterized in that The third working oil port (411) is in communication with the oil inlet port (111), and the fourth working oil port (412) is in communication with the main oil circuit.

3. The control valve assembly according to claim 1 or 2, characterized in that: A one-way flow structure (50) is provided between the third working oil port (411) and the oil inlet port (111).

4. The control valve assembly according to claim 1 or 2, characterized in that: The first valve body (11) and the second valve body (41) are an integral structure.

5. The control valve assembly according to claim 1 or 2, characterized in that: The first valve body (11) and the second valve body (41) are connected via an external pipeline.

6. The control valve assembly according to claim 2, characterized in that The second throttling structure (30) is a second throttling groove arranged on the oil discharge connecting groove (14).

7. The control valve assembly according to claim 6, characterized in that There are two oil discharge communicating grooves (14), and the two oil discharge communicating grooves (14) are respectively arranged on both sides of the oil inlet communicating groove (13), and the second throttling groove is arranged on both of the two oil discharge communicating grooves (14).

8. The control valve assembly according to claim 1, characterized in that The first control valve (10) and / or the second control valve (40) are electrically controlled reversing valves.

9. An engineering machine, characterized in that: A control valve assembly for an engineering machine comprising the control valve assembly as claimed in any one of claims 1 to 8.

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