A switching valve for a loader's quick-change hydraulic system

Abstract

The present invention belongs to the technical field of switching valves, and specifically relates to a switching valve for a loader quick-change hydraulic system. The valve comprises a rectangular parallelepiped valve body, a first valve core, a second valve core, and a pair of throttle valves; a pair of first oil passages extending through the upper and lower portions of the valve body; a pair of side oil outlets extending through the upper portion of the valve body, a pair of second oil passages extending through the upper portion of the valve body and extending side by side, and a pair of third oil passages extending through the lower portion of the valve body; a pair of oil inlets extending through the middle portion of the valve body; an operating lever for closing and opening the oil passages; when the hydraulic system oil circuit requires a large flow rate, the pair of second oil passages closes, the pair of third oil passages opens, and oil is admitted to the pair of oil inlets and discharged through the pair of lower oil outlets; when the hydraulic system oil circuit requires a small flow rate, the pair of second oil passages opens, the pair of third oil passages closes, and oil is admitted to the pair of oil inlets and discharged through the pair of side oil outlets; and a pair of throttle valves regulates the output flow rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of switching valves, and in particular relates to a switching valve for a quick-change hydraulic system of a loader. Background Art

[0002] The most popular loader tonnage is between 3 and 6 tons. Currently, due to technical reasons, the multi-way valves used for these tonnage loaders can only be three-piece. With the development of the loader market both domestically and internationally, the variety of loader ancillary tools is also increasing, such as snowplows, sweepers, and wood clamps, making the use of loaders more extensive. The use of quick-change devices allows loaders to quickly switch between various tools, achieving multiple uses with one machine, reducing lifting and disassembly time, improving work efficiency, saving resources, and avoiding the pin damage that can easily occur due to manual disassembly. Therefore, the use of quick-change devices is becoming increasingly common.

[0003] Since the multi-way valve can only be made of 3 pieces at present, in order to realize the functions of quick change and machine tools, a four-piece function is required. To achieve this function, the current loader quick change device commonly used methods are:

[0004] 1. Connecting a solenoid valve in parallel to the third section of the multi-way valve has the disadvantages of complicated operation, high cost, small flow rate, and low efficiency.

[0005] The main reasons are: because it is connected in parallel in the multi-way valve, the multi-way valve state needs to be adjusted to the high-pressure state during operation. During operation, it is necessary to adjust the multi-way valve state while operating the quick-change accessories, which is difficult to operate. In addition, the larger the flow rate of the solenoid valve, the higher the price, so the cost is also high. Because it is connected in parallel in the system, most of the flow is in the main oil circuit, resulting in only a small amount of flow being allocated to the quick-change oil circuit, resulting in low efficiency.

[0006] 2. Connect a ball valve or other switching valve in series with the third section of the multi-way valve. The ball valve allows the oil circuit of the third section to switch between the quick-change oil circuit and the attachment oil circuit. The disadvantage of this solution is that the flow rate cannot be adjusted and cannot meet the needs of various working conditions of the loader. Summary of the Invention

[0007] In view of the problems raised in the background technology, in order to solve the above problems, the present invention provides a switching valve for a loader quick-change hydraulic system. The specific technical solution of the invention is as follows: A switching valve for a loader quick-change hydraulic system includes a rectangular valve body 1, a first valve core 2, a second valve core 3 and a pair of throttle valves 4;

[0008] The valve body 1 has a pair of first oil passages 11 extending through the upper and lower parts thereof. The upper ends of the pair of first oil passages 11 are a pair of upper oil outlets 111 , and the lower ends of the pair of first oil passages 11 are a pair of lower oil outlets 112 .

[0009] A pair of side oil outlets 15 are formed at the upper end of the valve body 1, and the pair of side oil outlets 15 and the pair of first oil passages 11 are connected to each other. A pair of throttle valves 4 are installed on the pair of upper oil outlets 111 to adjust the opening of the pair of side oil outlets 15.

[0010] A pair of second oil passages 12 are provided in parallel on the upper portion of the valve body 1 , and the pair of second oil passages 12 are connected to the pair of first oil passages 11 .

[0011] A pair of third oil passages 13 are formed in the lower portion of the valve body 1 and are connected to the pair of first oil passages 11.

[0012] A pair of oil inlets 14 are formed in the middle of the valve body 1, and the pair of oil inlets 14 and the pair of first oil passages 11 are correspondingly connected;

[0013] The first valve core 2 and the second valve core 3 have the same structure, including a pair of cylindrical core bodies 21 and an operating rod 22. A pair of annular oil grooves 211 are correspondingly opened on the outer cylindrical surfaces of the pair of core bodies 21. The pair of core bodies 21 are arranged side by side. The operating rod 22 horizontally passes through the corresponding ends of the pair of core bodies 21 and is fixedly connected to the corresponding core bodies by a locking nut.

[0014] The pair of core bodies 21 of the first valve core 2 is correspondingly arranged in a pair of second oil passages 12, and the pair of core bodies 21 of the second valve core 3 is correspondingly arranged in a pair of third oil passages 13;

[0015] One end of the operating rod 22 installed on each core is the adjustment end, and the other end is the telescopic end, and both ends extend out of the valve body 1 and are sealed with the corresponding valve body 1 through the first end cover mechanism 5 and the second end cover mechanism 6 respectively;

[0016] When the above-mentioned switching valve is working, the operating rod 22 is operated to make each pair of cores 21 slide in the corresponding oil channel to realize the two states of closing the oil channel and opening the oil channel. When the pair of second oil channels 12 is opened and the pair of third oil channels 13 is closed, the pair of oil inlets 14 take in oil and output it through the pair of side oil outlets 15, and the pair of throttle valves 4 adjust the output flow. When the pair of second oil channels 12 is closed and the pair of third oil channels 13 is opened, the pair of oil inlets 14 take in oil and output it through the pair of lower oil outlets 112.

[0017] Furthermore, each upper oil outlet is inserted with an outer nut 42 through a first O-ring 44 , and the throttle valve core 41 of the throttle valve is inserted into the upper end of the first oil channel through the outer nut 42 and is locked and fixed by a locking nut 43 and the outer nut 42 .

[0018] Furthermore, the first end cover mechanism 5 includes a guide sleeve 51, a first end cap 52 and a T-shaped positioning seat 53. The vertical portion of the T-shaped positioning seat 53 is coaxially inserted into one end of the core body and is threadedly connected to the core body. The horizontal portion of the T-shaped positioning seat 53 is provided with a through hole, and a spring 54 is provided in the through hole. The two ends of the spring 54 are respectively limited in the through hole by steel balls 55.

[0019] The inner cylindrical surface of the guide sleeve 51 is provided with an annular first positioning groove 511 and a second positioning groove 512 at intervals. The guide sleeve 51 is fitted onto the outside of the T-shaped positioning seat 53 so that a pair of steel balls at both ends of the spring 54 abut against the first positioning groove 511 or the second positioning groove 512.

[0020] The first end cap 52 is sleeved on the outside of the guide sleeve 51 through the second O-ring 56 and is fixedly connected to the valve body 1 with corresponding bolts.

[0021] Furthermore, the second end cover mechanism 6 includes a second end cap 61, a third O-ring 62 and a fourth O-ring 63. The regulating end of the core body extends out of the valve body 1, and the second end cap 61 is sleeved on the part of the core body corresponding to the part passing through the valve body 1 through the third O-ring 62 and the fourth O-ring 63. The second end cap 61 and the valve body 1 are fixedly connected by corresponding bolts.

[0022] Furthermore, upper and lower mounting planes are correspondingly opened on the outer cylindrical surface of the adjusting end of the core body, and upper and lower locking nuts are provided on the upper and lower mounting planes. The operating rod 22 passes through the adjusting ends of a pair of core bodies 21 and is fixedly connected to the pair of core bodies 21 through the upper and lower locking nuts respectively.

[0023] The beneficial technical effects of the invention are as follows:

[0024] A switching valve for a quick-change hydraulic system of a loader according to the present invention comprises a rectangular valve body, a first valve core, a second valve core and a pair of throttle valves; a pair of first oil passages are provided through the upper and lower parts of the valve body; a pair of side oil outlets are provided at the upper end of the valve body, a pair of second oil passages are provided through the upper part of the valve body and are arranged side by side, and a pair of third oil passages are provided through the lower part of the valve body; a pair of oil inlets are provided in the middle of the valve body; when the switching valve is working, an operating lever is operated to make each pair of cores slide in the corresponding oil passages to realize two states of closing the oil passages and opening the oil passages; when the pair of second oil passages are opened and the pair of third oil passages are closed, oil is taken in by the pair of oil inlets and output through the pair of side oil outlets, and the pair of throttle valves adjust the output flow; when the pair of second oil passages are closed and the pair of third oil passages are opened, oil is taken in by the pair of oil inlets and output through the pair of lower oil outlets. Therefore, when used in a loader's quick-change hydraulic system, oil circuit switching is achieved, achieving the goal of "one oil circuit, two uses." Furthermore, when the hydraulic system's oil circuit requires a high flow rate, the pair of second oil passages is closed, the pair of third oil passages is opened, and oil is admitted through the pair of oil inlets and output through the pair of lower oil outlets. When the hydraulic system's oil circuit requires a lower flow rate, the pair of second oil passages is opened, the pair of third oil passages is closed, and oil is admitted through the pair of oil inlets and output through the pair of side oil outlets, with a pair of throttle valves regulating the output flow rate. This invention solves both the high cost and complex operation issues of the parallel solenoid valve solution and the inability of the ball valve to adjust flow rate. It achieves excellent results in the operating conditions where a loader achieves multiple uses with one machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a structural schematic diagram of a switching valve for a loader quick-change hydraulic system.

[0026] Figure 2 for Figure 1 Another axonometric view of .

[0027] Figure 3 Schematic diagram of the structure of the valve body of the invention.

[0028] Figure 4 for Figure 3 sectional view of .

[0029] Figure 5 for Figure 4 AA view of the .

[0030] Figure 6 It is a structural schematic diagram of the first valve core or the second valve core of the present invention.

[0031] Figure 7 for Figure 6 A partial cross-sectional view of .

[0032] Figure 8 Schematic diagram of the throttle valve of the present invention.

[0033] Figure 9 It is a cross-sectional view of a guide sleeve of the present invention.

[0034] Figure 10 It is a cross-sectional view of the first end cap of the present invention.

[0035] Figure 11 2 is a cross-sectional view of the second end cap of the present invention.

[0036] Figure 12 Schematic diagram of the switching valve of the present invention in working state 1.

[0037] Figure 13 for Figure 12 AA view of the .

[0038] Figure 14 Schematic diagram of the second working state of the switching valve of the present invention.

[0039] Figure 15 for Figure 14 AA view of the .

[0040] Among them: valve body 1, a pair of first oil passages 11, a pair of upper oil outlets 111, a pair of lower oil outlets 112, a pair of second oil passages 12, a pair of third oil passages 13, a pair of oil inlets 14, a pair of side oil outlets 15, a pair of mounting plates 16, a first valve core 2, a second valve core 3, a pair of core bodies 21, an operating rod 22, a pair of annular oil grooves 211,

[0041] A pair of throttle valves 4, a first O-ring 44, an outer nut 42, a throttle valve core 41, a first end cover mechanism 5, a guide sleeve 51, a first positioning groove 511, a second positioning groove 512, a first end cap 52, a T-shaped positioning seat 53, a spring 54, a steel ball 55, a second O-ring 56, a second end cover mechanism 6, a second end cap 61, a third O-ring 62, and a fourth O-ring 63. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions and advantages of the invention more clearly understood, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Example

[0043] See Figures 1 to 5 A switching valve for a loader quick-change hydraulic system includes a rectangular valve body 1, a first valve core 2, a second valve core 3 and a pair of throttle valves 4; a pair of mounting plates 16 are correspondingly provided on both sides of the valve body 1, and each mounting plate is an inverted L-shaped plate.

[0044] The valve body 1 has a pair of first oil passages 11 extending through the upper and lower parts thereof. The upper ends of the pair of first oil passages 11 are a pair of upper oil outlets 111 , and the lower ends of the pair of first oil passages 11 are a pair of lower oil outlets 112 .

[0045] A pair of side oil outlets 15 are formed at the upper end of the valve body 1, and the pair of side oil outlets 15 and the pair of first oil passages 11 are connected to each other. A pair of throttle valves 4 are installed on the pair of upper oil outlets 111 to adjust the opening of the pair of side oil outlets 15.

[0046] A pair of second oil passages 12 are provided in parallel on the upper portion of the valve body 1 , and the pair of second oil passages 12 are connected to the pair of first oil passages 11 .

[0047] A pair of third oil passages 13 are formed in the lower portion of the valve body 1, and the pair of third oil passages 13 are connected to the pair of first oil passages 11. A pair of oil inlets 14 are formed in the middle portion of the valve body 1, and the pair of oil inlets 14 are connected to the pair of first oil passages 11.

[0048] The first valve core 2 and the second valve core 3 have the same structure, including a pair of cylindrical core bodies 21 and an operating rod 22. A pair of annular oil grooves 211 are correspondingly opened on the outer cylindrical surfaces of the pair of core bodies 21. The pair of core bodies 21 are arranged side by side. The operating rod 22 horizontally passes through the corresponding ends of the pair of core bodies 21 and is fixedly connected to the corresponding core bodies by a locking nut.

[0049] See Figure 6 and Figure 7 , a pair of core bodies 21 of the first valve core 2 is correspondingly provided in a pair of second oil passages 12, and a pair of core bodies 21 of the second valve core 3 is correspondingly provided in a pair of third oil passages 13;

[0050] One end of the operating rod 22 installed on each core is the adjustment end, and the other end is the telescopic end, and both ends extend out of the valve body 1 and are sealed with the corresponding valve body 1 through the first end cover mechanism 5 and the second end cover mechanism 6 respectively;

[0051] When the above-mentioned switching valve is working, the operating rod 22 is operated to make each pair of cores 21 slide in the corresponding oil channel to realize the two states of closing the oil channel and opening the oil channel. When the pair of second oil channels 12 is opened and the pair of third oil channels 13 is closed, the pair of oil inlets 14 take in oil and output it through the pair of side oil outlets 15, and the pair of throttle valves 4 adjust the output flow. When the pair of second oil channels 12 is closed and the pair of third oil channels 13 is opened, the pair of oil inlets 14 take in oil and output it through the pair of lower oil outlets 112.

[0052] See Figure 8Each upper oil outlet is inserted with an outer nut 42 through a first O-ring 44, and the throttle valve core 41 of the throttle valve is inserted into the upper end of the first oil channel through the outer nut 42 and is locked and fixed by a locking nut 43 and the outer nut 42.

[0053] See Figures 9 and 10 The first end cover mechanism 5 includes a guide sleeve 51, a first end cap 52 and a T-shaped positioning seat 53. The vertical portion of the T-shaped positioning seat 53 is coaxially inserted into one end of the core body and is threadedly connected to the core body. The horizontal portion of the T-shaped positioning seat 53 is provided with a through hole, and a spring 54 is provided in the through hole. The two ends of the spring 54 are respectively limited in the through hole by steel balls 55.

[0054] A first annular positioning groove 511 and a second annular positioning groove 512 are spaced apart on the inner cylindrical surface of the guide sleeve 51. The guide sleeve 51 is fitted on the outside of the T-shaped positioning seat 53 so that a pair of steel balls at both ends of the spring 54 abut against the first positioning groove 511 or the second positioning groove 512; the first end cap 52 is fitted on the outside of the guide sleeve 51 through a second O-ring and is fixedly connected to the valve body 1 with corresponding bolts.

[0055] See Figure 11 The second end cover mechanism 6 includes a second end cap 61, a third O-ring 62 and a fourth O-ring 63,

[0056] The regulating end of the core extends out of the valve body 1 , and a second end cap 61 is sleeved on the portion of the core corresponding to the portion passing through the valve body 1 through a third O-ring 62 and a fourth O-ring 63 . The second end cap 61 and the valve body 1 are fixedly connected by corresponding bolts.

[0057] Upper and lower mounting planes are correspondingly opened on the outer cylindrical surface of the adjusting end of the core body, and upper and lower locking nuts are provided on the upper and lower mounting planes. The operating rod 22 passes through the adjusting ends of a pair of core bodies 21 and is fixedly connected to the pair of core bodies 21 through the upper and lower locking nuts respectively.

[0058] The operation lever 22 is operated to make each pair of cores 21 slide in the corresponding oil passage to realize the two states of closing the oil passage and opening the oil passage. Figure 12 and Figure 13 When the pair of steel balls on the first end cover mechanism 5 corresponding to the first valve core 2 are located in the second positioning groove 512, the pair of second oil passages 12 are opened. At this time, the pair of steel balls on the first end cover mechanism 5 corresponding to the second valve core 3 are located in the first positioning groove 511. At this time, the pair of third oil passages 13 are closed, the pair of oil inlets 14 take in oil and output it through the pair of side oil outlets 15, and the pair of throttle valves 4 adjust the output flow of the pair of side oil outlets 15.

[0059] See Figure 14 and Figure 15When the pair of steel balls on the first end cover mechanism 5 corresponding to the first valve core 2 are located in the first positioning groove 511, the pair of second oil passages 12 are closed. At this time, the pair of steel balls on the first end cover mechanism 5 corresponding to the second valve core 3 are located in the second positioning groove 512, the pair of third oil passages 13 are opened, and the pair of oil inlets 14 take in oil and output it through the pair of lower oil outlets 112.

[0060] Therefore, the present invention is used in the quick-change hydraulic system of a loader to realize oil circuit switching and achieve the purpose of "one oil circuit, two uses".

[0061] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention should be included in the scope of protection of the invention.

Claims

1. A switching valve for a loader quick-change hydraulic system, characterized by: It comprises a rectangular parallelepiped valve body (1), a first valve core (2), a second valve core (3) and a pair of throttle valves (4); The valve body (1) is provided with a pair of first oil passages (11) extending through the upper and lower parts thereof, wherein the upper ends of the pair of first oil passages (11) are a pair of upper oil outlets (111), and the lower ends of the pair of first oil passages (11) are a pair of lower oil outlets (112); A pair of side oil outlets (15) are provided at the upper end of the valve body (1), and the pair of side oil outlets (15) and the pair of first oil passages (11) are correspondingly connected. A pair of throttle valves (4) are correspondingly mounted on the pair of upper oil outlets (111) for adjusting the opening of the pair of side oil outlets (15); A pair of second oil passages (12) are provided in parallel and through the upper portion of the valve body (1), and the pair of second oil passages (12) are correspondingly connected to the pair of first oil passages (11); A pair of third oil passages (13) are provided in the lower portion of the valve body (1) and are connected to each other from front to back. The pair of third oil passages (13) are in communication with the pair of first oil passages (11). A pair of oil inlets (14) are provided in the middle of the valve body (1), and the pair of oil inlets (14) and the pair of first oil passages (11) are correspondingly connected; The first valve core (2) and the second valve core (3) have the same structure, comprising a pair of cylindrical core bodies (21) and an operating rod (22), a pair of annular oil grooves (211) correspondingly provided on the outer cylindrical surfaces of the pair of core bodies (21), the pair of core bodies (21) being arranged side by side, the operating rod (22) passing horizontally through corresponding ends of the pair of core bodies (21), and being fixedly connected to the corresponding core bodies via a locking nut; A pair of core bodies (21) of the first valve core (2) are correspondingly arranged in a pair of second oil passages (12), and a pair of core bodies (21) of the second valve core (3) are correspondingly arranged in a pair of third oil passages (13); One end of the operating rod (22) installed on each core is an adjusting end, and the other end is a telescopic end, and both ends extend out of the valve body (1) and are sealed with the corresponding valve body (1) through a first end cover mechanism (5) and a second end cover mechanism (6). When the switching valve is working, the operating lever (22) is operated to make each pair of core bodies (21) slide in the corresponding oil channel, realizing two states of closing the oil channel and opening the oil channel. When the pair of second oil channels (12) are opened and the pair of third oil channels (13) are closed, the pair of oil inlets (14) take in oil and output it through the pair of side oil outlets (15), and the pair of throttle valves (4) adjust the output flow. When the pair of second oil channels (12) are closed and the pair of third oil channels (13) are opened, the pair of oil inlets (14) take in oil and output it through the pair of lower oil outlets (112).

2. The switching valve for a loader quick-change hydraulic system according to claim 1, characterized in that: Each upper oil outlet is provided with an outer nut (42) through a first O-ring (44); a throttle valve core (41) of the throttle valve is inserted into the upper end of the first oil passage through the outer nut (42) and is locked and fixed by a locking nut (43) and the outer nut (42).

3. The switching valve for a loader quick-change hydraulic system according to claim 1, characterized in that: The first end cover mechanism (5) includes a guide sleeve (51), a first end cap (52) and a T-shaped positioning seat (53). The vertical portion of the T-shaped positioning seat (53) is coaxially inserted into one end of the core body and is threadedly connected to the core body. A through hole is opened on the horizontal portion of the T-shaped positioning seat (53), and a spring (54) is provided in the through hole. Both ends of the spring (54) are respectively limited in the through hole by steel balls (55). An annular first positioning groove (511) and a second positioning groove (512) are provided on the inner cylindrical surface of the guide sleeve (51), and the guide sleeve (51) is fitted onto the outside of the T-shaped positioning seat (53), so that a pair of steel balls at both ends of the spring (54) abut against the first positioning groove (511) or the second positioning groove (512); The first end cap (52) is sleeved on the outside of the guide sleeve (51) via a second O-ring (56) and is fixedly connected to the valve body (1) via corresponding bolts.

4. The switching valve for a loader quick-change hydraulic system according to claim 1, characterized in that: The second end cover mechanism (6) comprises a second end cap (61), a third O-ring (62) and a fourth O-ring (63); The regulating end of the core body extends out of the valve body (1), and a second end cap (61) is sleeved on the portion of the core body corresponding to the portion passing through the valve body (1) via a third O-ring (62) and a fourth O-ring (63), and the second end cap (61) and the valve body (1) are fixedly connected by corresponding bolts.

5. The switching valve for a loader quick-change hydraulic system according to claim 4, characterized in that: Upper and lower mounting planes are correspondingly provided on the outer cylindrical surface of the adjusting end of the core body, and upper and lower locking nuts are provided on the upper and lower mounting planes. The operating rod (22) passes through the adjusting ends of the pair of core bodies (21) and is fixedly connected to the pair of core bodies (21) through the upper and lower locking nuts.

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