Load-sensitive working joint multi-way valve

Abstract

A load sensitive working joint multi-way valve. It solves the problems of the existing load sensitive working joint multi-way valve, such as complicated processing, high cost and large size. It comprises a valve body, a main oil inlet flow channel, a main oil outlet hole and a compensator insertion hole which are arranged on the valve body, an installation groove which is arranged on the valve body and is used for installing a valve rod, the installation groove comprises a first flow groove and a second flow groove, a pressure compensator which is inserted into the compensator insertion hole, and the valve rod which is arranged in the installation groove and is in sliding cooperation with the valve body, the valve rod is provided with a first oil inlet throttling groove and a second oil inlet throttling groove, and the pressure oil of the main oil inlet flow channel is connected with the main oil outlet hole through the first flow groove, the first oil inlet throttling groove and / or the second flow groove and the second oil inlet throttling groove. The load sensitive working joint multi-way valve has the advantages of reliable action, small size and long service life.

Description

Technical Field

[0001] This utility model relates to a hydraulic multi-way valve, specifically a load-sensitive working multi-way valve. Background Technology

[0002] Hydraulic multi-way valves are core components of hydraulic systems. Multi-way valves on various main equipment fall into two main categories: six-way open-center throttling control multi-way valves (abbreviated as: open-center multi-way valves) and load-sensitive multi-way valves. For some compact and small-sized main equipment, such as truck-mounted cranes and mini excavators, where space is limited, the compact open-center multi-way valve is generally more suitable for these types of equipment, considering both manufacturing costs and space-saving operation. (See attached image) Figure 1 , attached Figure 2 The document provides the core for manufacturing the working valve body of the open-center multi-way valve and the working valve body of the open-center multi-way valve, with appendix... Figure 1 In the middle, 1 is the main flow channel core, and 2 is the bypass throttling oil flow channel core, with attached... Figure 2 3 is the one-way valve port, 4 is the bypass throttling outlet port, and 5 is the inlet port. These are typically molded, resulting in a compact overall size. However, open-center multi-way valves generally cannot achieve precise flow and speed control. Their actions are greatly affected by load fluctuations, making it impossible to perform multiple compound actions. Furthermore, they exhibit poor micro-motion and stability, leading to a less than ideal user experience and lower work efficiency. Load-sensitive multi-way valves with the same flow specifications are more complex, larger, heavier, and more expensive than open-center multi-way valves. Typically, if truck-mounted cranes or mini excavators require load-sensitive multi-way valves, the overall machine size needs to be increased to accommodate them, necessitating communication and coordination with the machine manufacturer. Furthermore, the length of the single-piece working valve body of the load-sensitive multi-way valve produced is over 135mm, the height is over 115mm, and the thickness is over 45mm. The overall size of the product is large, resulting in a small installation space. The large valve body occupies space, leaving even less room for customer operation, making it difficult to assemble on machines such as truck cranes and mini excavators. Utility Model Content

[0003] To address the problems of cumbersome processing, high cost, and large size of existing load-sensitive multi-way valves in the background art, this utility model provides a load-sensitive multi-way valve.

[0004] The technical solution of this utility model is: a load-sensitive multi-port valve, comprising a valve body, wherein the valve body is provided with a first working oil port and a second working oil port; and further comprising: The main oil inlet channel is located on the valve body and is used to supply oil from the oil inlet line or the previous working line to the multi-way valve body of the load-sensitive working line. The main oil outlet is located on the valve body and is connected to other working connections or tail connections. The compensator socket is located on the valve body; A mounting groove is provided on the valve body for valve stem mounting; the mounting groove includes a first flow groove and a second flow groove. The pressure compensator is inserted into the compensator socket. The valve stem is located in the mounting groove and slides with the valve body; the valve stem is provided with a first oil inlet throttling groove and a second oil inlet throttling groove; the pressure oil in the main oil inlet channel is connected to the main oil outlet through the first flow groove, the first oil inlet throttling groove and / or the second flow groove and the second oil inlet throttling groove.

[0005] As a further improvement of this utility model, the mounting groove includes a third flow groove. When the valve stem reverses, the main oil inlet channel is connected to the third flow groove through the first oil inlet throttling groove and the second oil inlet throttling groove. The third flow groove is connected to the compensator socket.

[0006] As a further improvement of this utility model, the first flow channel, the second flow channel and the third flow channel are all arranged in a ring.

[0007] As a further improvement of this utility model, it also includes a pressure compensator oil inlet hole, which is connected to the compensator insertion hole; the third flow groove is connected to the pressure compensator through the pressure compensator oil inlet hole.

[0008] As a further improvement of this utility model, the compensator socket includes a pressure compensator oil outlet, and the pressure oil at the pressure compensator is connected to the first working oil port and / or the second working oil port through the pressure compensator oil outlet.

[0009] As a further improvement of this utility model, the compensator socket includes a load feedback port, which is connected to the compensator socket; the pressure oil at the pressure compensator is connected to the feedback oil circuit through the load feedback port.

[0010] As a further improvement of this utility model, it also includes a first load feedback oblique hole and a second load feedback oblique hole; when the pressure oil output from the pressure compensator is sent to the first working oil port or the second working oil port to establish pressure, it is connected to the feedback oil circuit of different working connections through the first load feedback oblique hole and / or the second load feedback oblique hole.

[0011] As a further improvement of this utility model, the main oil inlet channel includes a first cast oil channel and a second cast oil channel; the main oil outlet includes a first oil outlet oblique hole and a second oil outlet oblique hole; the pressure oil of the main oil inlet channel is connected to the first oil outlet oblique hole through the first cast oil channel via the first flow groove, the first oil inlet throttling groove and / or through the second flow groove, the second oil inlet throttling groove and the second oil outlet oblique hole when the valve stem does not reverse.

[0012] As a further improvement of this utility model, the valve body is 120-130mm long, 35-42mm wide, and 85-95mm high.

[0013] As a further improvement of this utility model, the valve body is integrally cast.

[0014] The beneficial effects of this utility model are that the structure, which includes a main oil inlet channel, a main oil outlet, a mounting groove, and a valve stem, ensures a reliable flow area when the valve stem is in the neutral position. This utility model can directly and completely replace the open-center multi-way valve on the main unit, improving control performance. This utility model also has advantages such as reliable operation, small size, and long service life. Attached Figure Description

[0015] Figure 1 The outline drawing of the core of the cast valve body for the existing six-way open center throttling control working joint.

[0016] Figure 2 This is a drawing of the external shape of the existing six-way open center throttling control working joint cast valve body.

[0017] Figure 3 This is a view of the load-sensitive working valve body according to an embodiment of the present invention.

[0018] Figure 4 for Figure 3 Internal structure diagram.

[0019] Figure 5 for Figure 4 AA view.

[0020] Figure 6 for Figure 4 BB view.

[0021] Figure 7 This is an internal structural diagram of the load-sensitive working link in an embodiment of this utility model.

[0022] Figure 8 for Figure 7 The CC view.

[0023] Figure 9 for Figure 7 DD view.

[0024] In the diagram: 1. Main flow channel core; 2. Bypass throttling oil flow channel core; 3. Check valve socket; 4. Bypass throttling oil outlet; 5. Main inlet; 6. Compensator socket; 61. Pressure compensator outlet; 62. Load feedback port; 7. Main outlet; 71. First outlet oblique hole; 72. Second outlet oblique hole; 8. Mounting groove; 81. First flow channel; 82. Second flow channel; 83. Third flow channel; 9. Main inlet flow channel; 91. First casting oil passage; 92. Second casting oil passage; 10. Pressure compensator inlet; 11. First load feedback oblique hole; 12. Second load feedback oblique hole; 13. Valve stem; 131. First inlet throttling groove; 132. Second inlet throttling groove; 14. Pressure compensator; 15. Valve body; 151. First working port; 152. Second working port. Detailed Implementation

[0025] The embodiments of this utility model will be further described below with reference to the accompanying drawings: Depend on Figure 3-9 As shown, a load-sensitive multi-way valve includes a valve body 15, on which a first working port 151 and a second working port 152 are provided; it also includes: The main oil inlet channel 9 is located on the valve body 15 and is used to supply oil from the oil inlet line or the previous working line to the load-sensitive working line multi-way valve body 15. The main oil outlet 7 is located on the valve body 15 and is connected to other working connections or tail connections. The compensator socket 6 is located on the valve body 15; The mounting groove 8 is provided on the valve body 15 for mounting the valve stem 13; the mounting groove 8 includes a first flow groove 81 and a second flow groove 82. Pressure compensator 14 is inserted into compensator socket 6; The valve stem 13 is located in the mounting groove 8 and slides with the valve body 15. The valve stem 13 has a first inlet throttling groove 131 and a second inlet throttling groove 132. The pressure oil in the main inlet channel 9 is connected to the main outlet port 7 via the first flow groove 81, the first inlet throttling groove 131, and / or the second flow groove 82 and the second inlet throttling groove 132. Specifically, the valve body 15 is 120-130mm long, 35-42mm wide, and 85-95mm high. More specifically, the valve body 15 is integrally cast. The beneficial effects of this invention are that the structure of the main inlet channel, main outlet port, mounting groove, and valve stem ensures a reliable flow area when the valve stem is in the neutral position. This invention can directly and completely replace the open-center multi-way valve on the main unit, improving control performance. This invention also has the advantages of reliable operation, small size, and long service life. This invention relates to a novel load-sensitive working valve body, an improvement upon the cast valve body core of an open-center multi-way valve working valve. Both are cast using the same mold, reducing development costs and resulting in a smaller valve body suitable for load-sensitive systems. This also accommodates the limited installation space of the original open-center multi-way valve. In other words, this invention combines the compact size of an open-center multi-way valve with the performance of a load-sensitive multi-way valve. Furthermore, the multi-way valve assembled from the load-sensitive working valve can achieve the same compact size, identical installation, and port connections as the open-center multi-way valve, allowing for direct and complete replacement of the open-center multi-way valve on the main unit, thus improving operational performance. The difference between the cast valve body core of the load-sensitive working valve provided by this invention and the cast valve body core of the open-center multi-way valve working valve is that the latter eliminates the need for a separate core. Figure 1 The main channel core 1 and the bypass throttling oil flow channel core 2 are used, but the mold remains the same, and the corresponding parts are removed. Figure 1 The main channel core 1 cast Figure 2 The main oil inlet hole 5 is shown. This refers to two different control modes of the working valve body cast using the same mold; that is, this utility model is a load-sensitive working valve body integrally cast.

[0026] The mounting groove 8 includes a third flow channel 83. When the valve stem 13 reverses direction, the main oil inlet channel 9 connects to the third flow channel 83 via a first inlet throttling groove 131 or a second inlet throttling groove 132. The third flow channel 83 communicates with the compensator insertion hole 6. Specifically, the first flow channel 81, the second flow channel 82, and the third flow channel 83 are all arranged in a ring shape. Specifically, when the valve stem is not reversed, the pressure oil in the main oil inlet channel can flow to the next working section or tail section through the first flow channel 81 and / or the second flow channel 82. When the valve stem reverses direction, the pressure oil in the main oil inlet channel connects to the third flow channel via the first inlet throttling groove or the second inlet throttling groove and is delivered to the pressure compensator. Specifically, when the valve stem reverses, pressurized oil still enters the main oil outlet 7 through the first flow channel 81 and the second flow channel 82, but an oil passage is added to the third flow channel and the pressure compensator.

[0027] This utility model also includes a pressure compensator oil inlet 10, which is connected to the compensator insertion hole 6; the third flow groove 83 is connected to the pressure compensator 14 through the pressure compensator oil inlet 10. This utility model will Figure 2 The one-way valve socket 3 shown in the diagram is replaced with the compensator socket 6 shown in this utility model, and a pattern is machined on the bottom hole of the compensator socket 6 as shown in the diagram. Figure 4 and Figure 6 The pressure compensator inlet 10 shown facilitates oil passage connection, does not affect the external structure of the multi-way valve, and makes it easy to install the pressure compensator to achieve reliable feedback.

[0028] The compensator socket 6 includes a pressure compensator oil outlet 61, through which the pressure oil at the pressure compensator 14 is connected to the first working oil port 151 and / or the second working oil port 152. Specifically, the compensator socket 6 includes a load feedback port 62, which is connected to the compensator socket 6; the pressure oil at the pressure compensator 14 is connected to the feedback oil circuit through the load feedback port 62. This invention also includes a first load feedback inclined hole 11 and a second load feedback inclined hole 12; after the valve stem 13 reverses and pressure is established at the first working oil port 151 or the second working oil port 152, the pressure oil at the pressure compensator 14 is connected to the feedback oil circuit of different working connections through the first load feedback inclined hole 11 and / or the second load feedback inclined hole 12. This invention processes the load feedback ports of the pressure compensator socket as follows: Figure 6 The load feedback oblique hole shown is easy to connect to the feedback oil circuit in the system. It has a simple structure and can reliably transmit feedback signals, making the oil circuit control reliable.

[0029] The main oil inlet channel 9 includes a first cast oil channel 91 and a second cast oil channel 92; the main oil outlet 7 includes a first oil outlet oblique hole 71 and a second oil outlet oblique hole 72; the pressure oil in the main oil inlet channel 9 is connected to the first oil outlet oblique hole 71 via the first cast oil channel 91 when the valve stem 13 is not reversing, through the first flow groove 81, the first oil inlet throttling groove 131 and / or through the second flow groove 82, the second oil inlet throttling groove 132 and the second oil outlet oblique hole 72. This utility model eliminates the... Figure 1 The core of the bypass throttling oil flow channel cast by 2 Figure 2 The bypass throttle outlet 4 shown has a main outlet hole, a first outlet oblique hole, and a second outlet oblique hole machined on the new valve body blank. This facilitates the pressure oil to enter the next stage working link or tail link through the main outlet hole, ensuring a sufficiently large flow area.

[0030] This utility model will be further described in conjunction with the operation of the load-sensitive coupling: Due to the structural characteristics of the cast valve body of the open-center multi-way valve working link, the internal structure and flow channel of the load-sensitive working link of this utility model differ from those of a general load-sensitive working link, mainly in the main oil circuit. The main oil inlet flow channel 9 of this invention is the same as the bypass throttling flow channel of the open-center multi-way valve working link, both being cast from the same core. Figure 8 As shown, during operation, the pressure oil from the inlet line or the previous working line enters the load-sensitive working line through the main inlet channel 9. It then sequentially enters the annular first flow channel 81 and the first inlet throttling channel 131 and the first outlet oblique hole 71 of the valve stem 13 from the first casting channel, finally reaching the main outlet hole 7. Similarly, it sequentially enters the annular second flow channel 82 and the second inlet throttling channel 132 and the second outlet oblique hole 72 of the valve stem 13 from the second casting channel 92, finally reaching the main outlet hole 7. Regardless of whether the valve stem 13 reverses direction, the pressure oil flowing through the valve stem 13 will pass through both the annular first flow channel 81 and the annular second flow channel 82, ultimately flowing to the main outlet hole 7 and entering the next working line or tail line, ensuring a sufficiently large flow area.

[0031] When the valve stem 13 does not reverse, the first oil inlet throttling groove 131 and the second oil inlet throttling groove 132 are disconnected from the annular third flow groove 83 through the valve stem 13, so no pressure oil reaches the pressure compensator 14, and there is no pressure oil output from the pressure compensator outlet 61 and working port, and no load pressure output from the load feedback port 62.

[0032] When valve stem 13 reverses direction to the left (right), the second inlet throttling groove 132 (first inlet throttling groove 131) and the annular third flow channel 83 are connected. Pressure oil flows sequentially through the second inlet throttling groove 132 (first inlet throttling groove 131) into the annular third flow channel 83, the pressure compensator inlet port 10, and then to the pressure compensator 14. The pressure oil flowing out through the pressure compensator outlet port 61 goes to the working port. The flow direction of the pressure oil return path at the working port is the same as that of the open-center multi-way valve working connection (i.e., the same as the existing path, which will not be elaborated again and is not shown in the figure). When pressure oil is output to the working port and pressure is established, the pressure is transmitted to the pressure compensator 14 and outputs a load pressure signal to the first and second load feedback inclined holes via the load feedback port 62. The first and second load feedback inclined holes between working connections communicate with each other, forming a complete load pressure feedback oil circuit. The load pressure signal is fed back to the other working connections and the inlet connection, thus achieving load-sensitive control.

[0033] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A load-sensitive multi-way valve, comprising a valve body (15), wherein the valve body (15) is provided with a first working port (151) and a second working port (152); characterized in that: Also includes: The main oil inlet channel (9) is located on the valve body (15) and is used to supply oil from the oil inlet line or the upper-level working line to the multi-way valve body (15) of the load-sensitive working line. The main oil outlet (7) is located on the valve body (15) and is connected to other working connections or tail connections; The compensator socket (6) is located on the valve body (15); The mounting groove (8) is provided on the valve body (15) for mounting the valve stem (13); the mounting groove (8) includes a first flow groove (81) and a second flow groove (82). The pressure compensator (14) is inserted into the compensator socket (6); The valve stem (13) is located in the mounting groove (8) and slides with the valve body (15); the valve stem (13) is provided with a first oil inlet throttling groove (131) and a second oil inlet throttling groove (132); the pressure oil of the main oil inlet channel (9) is connected to the main oil outlet (7) through the first flow groove (81), the first oil inlet throttling groove (131) and / or the second flow groove (82) and the second oil inlet throttling groove (132).

2. The load-sensitive multi-way valve according to claim 1, characterized in that... The mounting groove (8) includes a third flow groove (83). The main oil inlet channel (9) is connected to the third flow groove (83) through the first oil inlet throttling groove (131) or the second oil inlet throttling groove (132) when the valve stem (13) reverses. The third flow groove (83) is connected to the compensator socket (6).

3. A load-sensitive multi-way valve according to claim 2, characterized in that... The first flow channel (81), the second flow channel (82) and the third flow channel (83) are all arranged in a ring.

4. A load-sensitive multi-way valve according to claim 2, characterized in that... It also includes a pressure compensator inlet (10) which is connected to the compensator socket (6); the third flow channel (83) is connected to the pressure compensator (14) through the pressure compensator inlet (10).

5. A load-sensitive multi-way valve according to claim 4, characterized in that... The compensator socket (6) includes a pressure compensator oil outlet (61), and the pressure oil at the pressure compensator (14) is connected to the first working oil port (151) and / or the second working oil port (152) through the pressure compensator oil outlet (61).

6. A load-sensitive multi-way valve according to claim 1, characterized in that... The compensator socket (6) includes a load feedback port (62) which is connected to the compensator socket (6); the pressure oil at the pressure compensator (14) is connected to the feedback oil circuit through the load feedback port (62).

7. A load-sensitive multi-way valve according to claim 6, characterized in that... It also includes a first load feedback oblique hole (11) and a second load feedback oblique hole (12); when the pressure oil output from the pressure compensator (14) is connected to the feedback oil circuit of different working links through the first load feedback oblique hole (11) and / or the second load feedback oblique hole (12) to establish pressure at the first working oil port (151) or the second working oil port (152), the pressure is established.

8. A load-sensitive multi-way valve according to claim 1, characterized in that... The main oil inlet channel (9) includes a first cast oil channel (91) and a second cast oil channel (92); the main oil outlet (7) includes a first oil outlet oblique hole (71) and a second oil outlet oblique hole (72); the pressure oil in the main oil inlet channel (9) is connected to the first oil outlet oblique hole (71) through the first cast oil channel (91) and the first oil inlet throttling channel (131) when the valve stem (13) is not reversed, and / or connected to the second oil outlet oblique hole (72) through the second flow channel (82) and the second oil inlet throttling channel (132).

9. A load-sensitive multi-way valve according to claim 1, characterized in that... The valve body (15) is 120-130mm long, 35-42mm wide, and 85-95mm high.

10. A load-sensitive multi-way valve according to claim 1, characterized in that... The valve body (15) is integrally cast.

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