A farm machinery level control system and valve block assembly with enhanced priority

Abstract

The present invention discloses a control system for improving the priority of agricultural machinery level and a valve block assembly. The oil outlet of an oil pump is connected to the oil inlet of a flow control valve. One oil outlet of the flow control valve is connected to the lifting oil inlet, and the other oil outlet is connected to the oil inlet of a sequence valve. One oil outlet of the sequence valve is connected to the oil inlet of a horizontal electromagnetic directional valve and the oil inlet of a horizontal overflow valve, and the other oil outlet is connected to the lifting oil inlet on the agricultural machinery. The horizontal electromagnetic directional valve is connected to a horizontal oil cylinder, and the lifting directional valve is connected to a lifting oil cylinder. The sequence valve of the present invention can cut off the oil supply to the horizontal oil cylinder according to the increase of the lifting pressure of the farm implement, and supply the high-pressure oil supplied to the horizontal oil cylinder to the lifting oil cylinder, so as to improve the speed of the lifting oil cylinder for lifting the suspended farm implement.

Description

Technical Field

[0001] The present invention relates to agricultural machinery, and particularly to a farm machinery level control system and a valve block assembly with lift priority. Background Art

[0002] Land leveling is an important production link in agriculture. Leveled land can not only increase yields, but also save water resources, which is conducive to subsequent field management. For paddy fields, it can also reduce the growth of weeds. To level the land, people use laser land leveling technology and install a farm implement level control system on the tractor suspension system. Although these methods can keep the suspended farm implements in a horizontal state, there are still some problems. For example, in the design, the hydraulic oil output by the original tractor hydraulic pump is divided into two parts. One part is supplied to the original tractor lift hydraulic oil circuit, and the other part is supplied to the installed farm implement level control oil circuit. Moreover, these two oil circuits are always in a separated state during tractor operation. Therefore, on small and medium horsepower tractors, there will be insufficient hydraulic oil supplied to the lift cylinder for lifting the farm implements of the original tractor. After installing the farm implement level control system on the tractor, the rising speed of the lifted farm implements slows down, affecting the operation efficiency.

[0003] To address this problem, the patent "A Hydraulic Level Control System for a Farm Machinery Suspension Mechanism with Fast Lift" (Patent No.: 201910690086.8) proposes using a lift electromagnetic directional valve and a pressure sensor, which can also achieve fast lifting of farm implements. However, there are electrical components such as pressure sensors or pressure relays in this structure. For tractors operating in paddy fields, these electrical components are easily contaminated with mud and water, resulting in short circuit and leakage problems. Therefore, people need to take special protective measures to protect these electrical components. In addition, these electrical components are not conducive to self-maintenance by farmers. Therefore, there is an urgent need in production to solve the problem of not configuring electrical components such as pressure sensors and being able to achieve fast lifting of farm implements. Summary of the Invention

[0004] The object of the present invention is to provide a farm machinery level control system and a valve block assembly with lift priority to solve the problems in the related art that after configuring a farm machinery level control system on a tractor, the speed of the tractor for lifting farm implements is significantly reduced, affecting the working efficiency of the tractor and often causing the tractor to stall during operation.

[0005] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] In a first aspect, an agricultural machinery level control system valve block assembly with enhanced priority according to an embodiment of the present invention includes: a valve block, a horizontal electromagnetic directional control valve, a horizontal relief valve, a sequence valve, and a flow control valve mounted on the valve block. An oil inlet P of the flow control valve is connected to a main oil inlet through an oil passage. An oil outlet of the flow control valve is connected to a lifting oil inlet through an oil passage, and another oil outlet of the flow control valve is connected to an oil inlet of the sequence valve through an oil passage. An oil outlet of the sequence valve is connected to an oil inlet of the horizontal electromagnetic directional control valve and an oil inlet of the horizontal relief valve through an oil passage respectively, and another oil outlet of the sequence valve is connected to the lifting oil inlet through an oil passage. An oil return port of the horizontal electromagnetic directional control valve and an outlet of the horizontal relief valve are both connected to an oil return port T through an oil passage. A first horizontal adjustment oil inlet A and a second horizontal adjustment oil inlet B are respectively connected to two oil outlets of the horizontal electromagnetic directional control valve through oil passages.

[0007] Further, a first pilot-operated check valve and a second pilot-operated check valve are also mounted on the valve block. Two ends of the first pilot-operated check valve are respectively connected to the first horizontal adjustment oil inlet A and an oil outlet of the horizontal electromagnetic directional control valve through oil passages, and two ends of the second pilot-operated check valve are respectively connected to the second horizontal adjustment oil inlet B and another oil outlet of the horizontal electromagnetic directional control valve through oil passages.

[0008] Further, the valve block also includes a secondary filter, an oil inlet C and an oil outlet D of the secondary filter. The oil inlet C of the secondary filter is connected to an oil outlet of the flow control valve through an oil passage, and the oil outlet D of the secondary filter is connected to an oil inlet of the sequence valve through an oil passage. The oil inlet and the oil outlet of the secondary filter are respectively connected to the oil inlet C and the oil outlet D of the secondary filter.

[0009] Further, the valve block also includes a proportional valve. An oil inlet of the proportional valve is connected to an oil inlet of the horizontal electromagnetic directional control valve, an oil inlet of the horizontal relief valve, and an oil outlet of the sequence valve through an oil passage, and its oil outlet is connected to an oil return port of the horizontal electromagnetic directional control valve and an outlet of the horizontal relief valve through an oil passage.

[0010] Further, the valve block also includes an adjustable plug port. Threads are provided inside the oil inlet C and the oil outlet D of the secondary filter. An oil passage connecting the oil inlet C and the oil outlet D of the secondary filter is provided. At the same time, a threaded hole communicating with this oil passage and perpendicular to this oil passage is provided, that is, the adjustable plug port.

[0011] In a second aspect, an embodiment of the present invention further provides a control system for improving the priority of agricultural machinery level, which includes: a level oil cylinder, a first pilot-operated check valve, a second pilot-operated check valve, a level electromagnetic directional control valve, a level relief valve, an oil tank, a sequence valve, a flow control valve, and an oil pump. The oil outlet of the oil pump is connected to the oil inlet of the flow control valve. One oil outlet of the flow control valve is connected to the oil inlet of the sequence valve. One oil outlet of the sequence valve is respectively connected to the oil inlet of the level electromagnetic directional control valve and the oil inlet of the level relief valve. The other oil outlet of the flow control valve and the other oil outlet of the sequence valve are both connected to the lifting oil inlet. The two oil outlets of the level electromagnetic directional control valve are respectively connected to the rod chamber and the rodless chamber of the level oil cylinder through a two-way hydraulic lock composed of the first pilot-operated check valve and the second pilot-operated check valve. The oil return port of the level electromagnetic directional control valve and the oil outlet of the level relief valve are both connected to the oil tank.

[0012] Further, one oil outlet of the flow control valve is connected to the oil inlet of the sequence valve through a secondary filter.

[0013] Further, a proportional valve is further included. The oil inlet of the proportional valve is respectively connected to the oil inlet of the level electromagnetic directional control valve, the oil inlet of the level relief valve, and one oil outlet of the sequence valve. The oil outlet of the proportional valve is connected to the oil return port of the level electromagnetic directional control valve and the oil outlet of the level relief valve.

[0014] Further, the level electromagnetic directional control valve is a three-position four-way electromagnetic directional control valve, and the sequence valve is a two-position three-way sequence valve.

[0015] Further, a switching solenoid valve is further included. One oil outlet of the sequence valve is connected to the oil inlet of the switching solenoid valve, and the other oil outlet is connected to the lifting oil inlet. One oil outlet of the switching solenoid valve is respectively connected to the oil inlet of the level electromagnetic directional control valve and the oil inlet of the level relief valve, and the other oil outlet is connected to the lifting oil inlet.

[0016] According to the above technical solutions, the sequence valve in the embodiment of the present invention can ensure that when the oil supply to the lifting oil circuit causes the pressure of the lifting oil circuit to increase, the system cuts off the oil supply to the level oil cylinder, and all the hydraulic oil is used for the operation of the lifting oil cylinder, greatly improving the rising speed of the lifting oil cylinder, and avoiding the problem that after installing the agricultural implement level control system, the oil supply to the lifting oil cylinder is reduced, resulting in too slow lifting speed of the agricultural implement and often stalling of the tractor under heavy loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1It is a hydraulic schematic diagram of a farm machinery level control system that enhances priority provided by an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the installation positions of the lift-priority farm machinery hydraulic level control system, the lifting mechanism, and the lift high sensor in an embodiment of the present invention (i.e., the solution without setting a secondary filter or a proportional valve);

[0020] Figure 3 It is a hydraulic system schematic diagram of an embodiment of the present invention that sets a secondary filter and does not set a proportional valve;

[0021] Figure 4 It is a hydraulic system schematic diagram of an embodiment of the present invention that does not set a secondary filter and sets a proportional valve;

[0022] Figure 5 It is a hydraulic system schematic diagram of an embodiment of the present invention that sets a secondary filter and also sets a proportional valve;

[0023] Figure 6 It is a hydraulic system schematic diagram of an embodiment of the present invention that sets a switching valve and does not set a proportional valve;

[0024] Figure 7 It is a hydraulic system schematic diagram of an embodiment of the present invention that sets a switching valve and also sets a proportional valve;

[0025] Figure 8 It is a schematic diagram of a farm machinery suspension mechanism with a level adjustment function in an embodiment of the present invention;

[0026] Figure 9 It is a valve block diagram of a hydraulic system in an embodiment of the present invention that does not set a secondary filter and a proportional valve;

[0027] Figure 10 It is a valve block assembly of a hydraulic system in an embodiment of the present invention that does not set a secondary filter and a proportional valve;

[0028] Figure 11 It is a valve block diagram of a hydraulic system in an embodiment of the present invention that sets a secondary filter and does not set a proportional valve;

[0029] Figure 12 It is a valve block assembly of a hydraulic system in an embodiment of the present invention that sets a secondary filter and does not set a proportional valve;

[0030] Figure 13 It is a valve block diagram of a hydraulic system in an embodiment of the present invention that does not set a secondary filter and sets a proportional valve;

[0031] Figure 14 It is a valve block assembly of a hydraulic system in an embodiment of the present invention that does not set a secondary filter and sets a proportional valve;

[0032] Figure 15 It is the valve block diagram of the hydraulic system provided with a secondary filter and a proportional valve according to an embodiment of the present invention;

[0033] Figure 16 It is the valve block assembly of the hydraulic system provided with a secondary filter and a proportional valve according to an embodiment of the present invention;

[0034] Figure 17 It is the valve block diagram with multiple transformation functions according to an embodiment of the present invention;

[0035] In the figure: horizontal oil cylinder 1, first hydraulic control check valve 2, second hydraulic control check valve 3, horizontal electromagnetic directional control valve 4, horizontal relief valve 5, fuel tank 6, switching solenoid valve 7, sequence valve 8, secondary filter 9, flow control valve 10, oil pump 11, filter 12, lifting relief valve 13, lifting directional control valve 14, third hydraulic control check valve 15, fourth hydraulic control check valve 16, lifting high position sensor 17, sensor bracket screw 18, nut 19, sensor bracket 20, lifting control lever 21, lifting position scale plate 22, cab floor 23, controller 24, lifting oil cylinder 25, upper pull rod 26, lifting arm shaft 27, lifting arm 28, lifting rod 29, lower pull rod 30, tractor frame 31, proportional valve 32, lifting oil inlet 33, oil inlet C of the secondary filter 34, flow control valve cavity 35, oil outlet D of the secondary filter 36, adjustable plug port 37, sequence valve cavity 38, horizontal electromagnetic directional control valve cavity 39, oil return port T 40, second horizontal adjustment oil inlet B 41, double hydraulic lock cavity 42, first horizontal adjustment oil inlet A 43, horizontal relief valve cavity 45, proportional valve cavity 46, valve block 47, valve block bolt fixing hole 48, total oil inlet 49. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of the features, steps, operations, devices, components and / or their combinations.

[0038] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] For ease of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above" etc. may be used here to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, the device described as "above" or "on top of" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used here will be made.

[0040] Now, exemplary embodiments according to the present application will be described in more detail with reference to the drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

[0041] Example 1:

[0042] As Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a control system for agricultural machinery with enhanced priority is provided. The agricultural machinery can be a tractor, a rotary tiller, etc. Existing agricultural machinery is equipped with a lifting mechanism, which includes a lifting overflow valve 13, a lifting reversing valve 14, a third hydraulic check valve 15, a fourth hydraulic check valve 16, and a lifting cylinder 25. The specific oil circuit connections will be elaborated in detail below and will not be elaborated here for now. The agricultural machinery level control system includes: a horizontal cylinder 1, a first hydraulic check valve 2, a second hydraulic check valve 3, a horizontal electromagnetic reversing valve 4, a horizontal overflow valve 5, a fuel tank 6, a sequence valve 8, a flow control valve 10, and an oil pump 11. The oil outlet of the oil pump 11 is connected to the oil inlet P of the flow control valve 10. The flow control valve 10 is provided with two oil outlets P1 and P2. One oil outlet P2 of the flow control valve 10 is connected to the lifting oil inlet 33. The lifting oil inlet 33 is respectively connected to the oil inlet P8 of the lifting reversing valve 14 and the oil inlet P9 of the lifting overflow valve 13. The other oil outlet P1 of the flow control valve 10 is connected to the oil inlet ② of the sequence valve 8. One oil outlet ③ of the sequence valve 8 is connected to the oil inlet P6 of the horizontal electromagnetic reversing valve 4 and the oil inlet P7 of the horizontal overflow valve 5. The other oil outlet ① is connected to the oil inlet P8 of the lifting reversing valve 14 through the lifting oil inlet 33. The two oil outlets of the horizontal electromagnetic reversing valve 4 are respectively connected to the rod chamber and the non-rod chamber of the horizontal cylinder 1 through the ④ and ⑥ oil ports in the two-way hydraulic lock 44. The two oil outlets of the lifting reversing valve 14 are respectively connected to the rod chamber and the non-rod chamber of the lifting cylinder 25 through the third hydraulic check valve 15 and the fourth hydraulic check valve 16. The oil return port of the horizontal electromagnetic reversing valve 4, the oil outlet of the horizontal overflow valve 5, the oil return port of the lifting reversing valve 14, and the oil outlet of the lifting overflow valve 13 are all connected to the fuel tank 6.

[0043] In a possible embodiment, as Figure 3 shown, it includes a secondary filter 9. One oil outlet of the flow control valve 10 is connected to the sequence valve 8 through the secondary filter 9.

[0044] In a possible embodiment, as Figure 4 shown, it includes a proportional valve 32. The oil inlet of the proportional valve 32 is connected to the oil inlet P6 of the horizontal electromagnetic reversing valve 4, the oil inlet P7 of the horizontal overflow valve 5, and one oil outlet of the sequence valve 8. Its oil outlet is connected to the oil return port T4 of the horizontal electromagnetic reversing valve 4 and the oil outlet of the horizontal overflow valve 5. To improve the control accuracy of the agricultural machinery level.

[0045] In a possible embodiment, as Figure 5As shown, it includes both a secondary filter 9 and a proportional valve 32. An oil outlet of a flow control valve 10 is connected to a sequence valve 8 through the secondary filter 9. An oil inlet of the proportional valve 32 is connected to an oil inlet P6 of a horizontal electromagnetic directional valve 4, an oil inlet P7 of a horizontal relief valve 5, and an oil outlet of the sequence valve 8. Its oil outlet is connected to an oil return port T4 of the horizontal electromagnetic directional valve 4 and an oil outlet of the horizontal relief valve 5.

[0046] In a possible embodiment, as Figure 2-5 shown, before the oil pump 11 sucks oil from the fuel tank 6, impurities in the hydraulic oil before entering the oil pump are filtered out by a filter 12.

[0047] As Figure 3 and Figure 5 shown, an oil outlet P1 of the flow control valve 10 is connected to an oil inlet ② of the sequence valve 8 through the secondary filter 9. Since the working environment of the tractor is harsh and often due to untimely maintenance, impurities in the hydraulic oil cause faults such as jamming of the horizontal electromagnetic directional valve. Therefore, the hydraulic system needs to be filtered twice. Since the flow rate at the oil inlet P of the flow control valve is the sum of the flow rates at its oil outlets P1 and P2, and moreover, when the sequence valve 8 is working, the flow rate entering the horizontal electromagnetic directional valve 4 through P1 is much smaller than the flow rate entering the lifting directional valve through P2. By arranging the secondary filter 9 between the flow control valve 10 and the sequence valve 8, not only can impurities in the hydraulic oil be blocked from entering the horizontal electromagnetic directional valve 4, but also the flow rate of the secondary filter 9 can be reduced, greatly reducing the size and weight of the secondary filter.

[0048] Of course, when the hydraulic oil is relatively clean and replaced in a timely manner, the secondary filter 9 can be not provided, and the oil outlet P1 of the flow control valve 10 can be directly connected to the oil inlet ② of the sequence valve 8 to save costs.

[0049] In a possible embodiment, the horizontal electromagnetic directional valve 4 is a three-position four-way electromagnetic directional valve with a neutral position of the H type, the sequence valve 8 is a two-position three-way sequence valve, and the switching solenoid valve 7 is a two-position three-way electromagnetic directional valve.

[0050] In a possible embodiment, as Figure 6 and Figure 7 shown, it may further include a switching solenoid valve 7. An oil outlet ③ of the sequence valve 8 is connected to an oil inlet P3 of the switching solenoid valve 7, and another oil outlet ① is connected to a lifting oil inlet 33. The switching solenoid valve 7 has two oil outlets P4 and P5. An oil outlet P4 of the switching solenoid valve 7 is respectively connected to an oil inlet P6 of the horizontal electromagnetic directional valve 4 and an oil inlet P7 of the horizontal relief valve 5, and another oil outlet P5 is connected to the lifting oil inlet 33. In this way, when the horizontal electromagnetic directional valve 4 is in the neutral position and the switching solenoid valve 7 is not energized, the hydraulic oil at the oil outlet ③ of the sequence valve 8 also flows to the lifting oil inlet 33, improving the movement speed of the lifting cylinder 25.

[0051] When any one of the two electromagnets of the horizontal electromagnetic directional control valve 4 is energized, the electromagnet of the switching solenoid valve 7 is energized, the spool of the switching solenoid valve 7 moves leftward, the oil inlet P3 and the oil outlet P4 of the switching solenoid valve 7 are connected, and the hydraulic oil coming from the sequence valve 8 enters the oil inlet P6 of the horizontal electromagnetic directional control valve 4, and the hydraulic horizontal control system can work.

[0052] When neither of the two electromagnets of the horizontal electromagnetic directional control valve 4 is energized, the switching solenoid valve 7 is also not energized, that is, in the Figure 6 position shown, the hydraulic oil entering the switching solenoid valve 7 from the sequence valve 8 will enter the oil inlet P8 of the lifting directional control valve 14 to accelerate the movement speed of the lifting cylinder 25.

[0053] The switching solenoid valve can ensure that when the tractor is in a horizontal state and the horizontal electromagnetic directional control valve is in the neutral position, the oil supply to the horizontal electromagnetic directional control valve is also cut off, and all the hydraulic oil coming from the oil pump is supplied to the lifting directional control valve, so that when the lifting cylinder works, a large amount of hydraulic oil can be quickly obtained to increase the rising speed of the farm implement.

[0054] Here, the lifting mechanism on the agricultural machinery is further described. The two oil outlets of the lifting directional control valve 14 are respectively connected to the lifting cylinder 25 through the third hydraulic control check valve 15 and the fourth hydraulic control check valve 16. The hydraulic control circuit of the third hydraulic control check valve 15 is connected to the oil inlet circuit of the fourth hydraulic control check valve 16, and the hydraulic control circuit of the fourth hydraulic control check valve 16 is connected to the oil inlet circuit of the third hydraulic control check valve 15.

[0055] When the lifting cylinder 25 is stationary and the lifting directional control valve 14 is in the neutral position shown in the figure, the hydraulic oil at the P2 outlet of the flow control valve 10 is in a low-pressure state. The hydraulic oil at the P2 outlet of the flow control valve 10 returns to the oil tank through the neutral unloading of the lifting directional control valve 14. The oil inlet ② of the sequence valve 8 is connected to its oil outlet ③, and the hydraulic oil at the P1 outlet of the flow control valve 10 enters the oil inlet P3 of the switching solenoid valve 7 through the secondary filter 9 and the sequence valve 8. There are two situations at this time.

[0056] (1) When the switching solenoid valve 7 is not energized and the lifting directional control valve 14 is in the position shown in the figure, the oil outlet P5 of the switching solenoid valve 7 is connected to the lifting oil inlet 33, and the hydraulic oil passing through the secondary filter 9 enters the neutral oil tank of the lifting directional control valve 14, and the oil inlet P3 of the switching solenoid valve 7 is not connected to its oil outlet P4.

[0057] (2) When the tractor is tilted and the controller 24 makes any solenoid valve of the horizontal electromagnetic directional control valve 4 energized, the switching solenoid valve 7 is also energized at the same time, the spool of the switching solenoid valve 7 moves leftward, and the oil inlet P3 of the switching solenoid valve 7 is connected to the oil inlet P6 of the horizontal electromagnetic directional control valve 4, and the horizontal adjustment of the farm implement can be carried out.

[0058] When the spool of the lift reversing valve 14 moves left and right and is not in the middle position, the hydraulic oil at the oil outlet P2 of the flow control valve 10 enters the lift cylinder 25. The lift cylinder 25 is in a moving state, and the oil pressure at the outlet P2 increases. The high-pressure oil will push the spool of the sequence valve 8 to move left, and the oil inlet ② of the sequence valve 8 is connected to its oil outlet ①. The hydraulic oil from the P1 oil outlet of the flow control valve 10 also enters the lift cylinder 25. In this way, all the hydraulic oil of the oil pump 11 enters the lift cylinder 25, increasing the moving speed of the lift cylinder 25. At this time, under the control of the controller 24, although the electromagnets of the horizontal electromagnetic reversing valve 4 and the switching solenoid valve 7 are energized, there is no hydraulic oil supply in the horizontal control oil circuit, and the horizontal adjustment of the farm implements cannot be carried out. At this time, under the action of the two-way hydraulic lock 44, the piston of the horizontal cylinder 1 remains stationary.

[0059] The ④ and ⑤ oil ports of the two-way hydraulic lock 44 are respectively connected to the oil outlet A of the horizontal electromagnetic reversing valve 4 and the rod chamber of the horizontal cylinder 1, and the ⑥ and ⑦ oil ports are respectively connected to the oil outlet B of the horizontal electromagnetic reversing valve 4 and the rodless chamber of the horizontal cylinder 1. The oil return port T4 of the horizontal electromagnetic reversing valve 1 is connected to the oil outlet T5 of the horizontal relief valve and returns to the fuel tank.

[0060] In a possible embodiment, the lift reversing valve 14 is a manual three-position four-way valve, which is controlled by the lift control lever 21. If it is a manual reversing valve, a lift position scale plate 22 is arranged above the rotating shaft O1 of the lift control lever 21. The lift high sensor 17 is located above the rotating shaft O! of the lift control lever 21 and below the lift position scale plate 22. The lift position scale plate 22 is fixedly connected to the cab floor 23, and the lift high sensor 17 is fixedly connected to the sensor bracket 20. The screw 18 of the sensor bracket 20 passes through the long slot on the lift position scale plate 22 and is fixedly connected to the lift position scale plate 22 through the nut 19.

[0061] According to the structure of the lift position scale plate 22 and the cab 23, the screw 18 of the sensor bracket 20 can pass through the hole in the bottom plate of the cab 23 and be fixed by the nut 19. The sensor can be a proximity switch, a photoelectric sensor, a travel switch, etc.

[0062] When the lift control lever 21 rotates counterclockwise around the rotating shaft O1, the spool of the lift reversing valve 14 moves to the right, and the hydraulic suspension mechanism of the tractor lifts the farm implements. When the lift control lever 21 rotates around the rotating shaft O1 to the front of the lift high sensor 17, the lift high sensor 17 is touched. The lift high sensor 17 will send a signal to the controller 24, informing that the connected farm implements have been lifted to the required height position by the hydraulic suspension mechanism. After the controller 24 automatically levels the suspended farm implements, it will then cut off the power supply of the horizontal electromagnetic reversing valve 4, so that the suspended farm implements are always in a horizontal state, which is convenient for the tractor suspension unit to transfer plots and travel on the road.

[0063] A lift high sensor is arranged below the lift position scale plate, which can sense the position of the lift control lever when the agricultural implement is lifted to the height required for transportation. This facilitates the controller to automatically adjust the agricultural implement to a horizontal state after the agricultural implement rises to the required height and cut off the power supply of the horizontal electromagnetic directional valve, avoiding the up and down shaking of the suspended agricultural implement caused by the activation of the horizontal adjustment function during tractor transfer of plots and transportation, resulting in poor safety and affecting the stability of operation.

[0064] As Figure 8 As shown, the tractor agricultural implement lift mechanism mainly consists of a lift cylinder 25, an upper pull rod 26, a lift arm shaft 27, a lift arm 28, a lift rod 29, a lower pull rod 30, and a lift cylinder 25, etc. The lift arm shaft 27 is hinged to the tractor frame 31. Both ends of the lift arm shaft 27 are fixedly connected to the lift arm 28. The lower end of the lift cylinder 25 is hinged to the tractor frame 31, and the upper end is hinged to the lift arm 28. The rear ends of the two lift arms 28 are respectively hinged to the lift rod 29 and the horizontal cylinder 1. Both ends of the lift rod 29 are respectively hinged to the lift arm 28 and the lower pull rod 30. Here, the lift cylinder 25 can be divided into a left lift cylinder and a right lift cylinder. By controlling the lift cylinder 25, the lifting adjustment of the tractor agricultural implement lift mechanism is realized. By controlling the horizontal cylinder 1, the horizontal adjustment of the tractor agricultural implement lift mechanism is realized.

[0065] All solenoid valves (except manual ones) are connected to the controller 16 and are controlled by the controller 24. The controller 24 can adopt the product of model JG-TPH01 of Hangzhou Jinggong Hydraulic & Electrical Manufacturing Co., Ltd., but is not limited to this.

[0066] It should be noted that if the sequence valve 8 in this system is replaced with a two-position four-way solenoid valve plus a pressure sensor, that is, the method of the patent "A Hydraulic Horizontal Control System for a Fast-Lifting Agricultural Machinery Suspension Mechanism" (Patent No.: 201910690086.8) is adopted, the agricultural implement can also be lifted quickly. However, this structure is complex, costly, and also requires electrical components such as pressure sensors or pressure relays, which brings trouble to the design and installation of the circuit and is prone to problems such as wire leakage.

[0067] Embodiment 2:

[0068] As Figure 9As shown in the figure, this embodiment provides a valve block assembly for an agricultural machinery level control system with enhanced priority, including: a valve block 47 and a two-way hydraulic lock 44, a horizontal electromagnetic directional control valve 4, a horizontal relief valve 5, a sequence valve 8, and a flow control valve 10 installed on the valve body 47. The valve block is provided with a main oil inlet 49, an oil return port T40, a lifting oil inlet 33, a first horizontal adjustment oil inlet A43, a second horizontal adjustment oil inlet B41, and oil channels. The main oil inlet 49 is connected to the oil inlet P of the flow control valve 10 through an oil channel. One oil outlet of the flow control valve 10 is connected to the lifting oil inlet 33 through an oil channel, and the other oil outlet is connected to the oil inlet of the sequence valve 8 through an oil channel. One oil outlet of the sequence valve 8 is connected to the oil inlets of the horizontal electromagnetic directional control valve 4 and the horizontal relief valve 5 respectively through an oil channel, and the other oil outlet is connected to the lifting oil inlet 33 through an oil channel. The oil return port of the horizontal electromagnetic directional control valve 4 and the oil outlet of the horizontal relief valve 5 are both connected to the oil return port T40 through an oil channel. The first horizontal adjustment oil inlet A43 and the second horizontal adjustment oil inlet B41 are respectively connected to the two oil outlets of the horizontal electromagnetic directional control valve 4 through oil channels.

[0069] Further, the valve block is machined with a flow control valve cavity 35 for installing the flow control valve 10, a sequence valve cavity 38 for installing the sequence valve 8, a horizontal electromagnetic directional control valve cavity 39 for installing the horizontal electromagnetic directional control valve 4, a horizontal relief valve cavity 45 for the horizontal relief valve 5, and a two-way hydraulic lock cavity 42 for installing the two-way hydraulic lock 44. The ④ and ⑤ oil ports of the two-way hydraulic lock 44 are respectively connected to an oil outlet of the horizontal electromagnetic directional control valve 4 and the first horizontal adjustment oil inlet A43 through oil channels, and the ⑥ and ⑦ oil ports are respectively connected to the other oil outlet of the horizontal electromagnetic directional control valve 4 and the second horizontal adjustment oil inlet B41 through oil channels.

[0070] The valve block 47 is also provided with a lifting oil inlet 33, and the lifting oil inlet 33 is respectively connected to the oil outlet P2 of the flow control valve 10 and the other oil outlet ① of the sequence valve 8 through oil channels. The lifting oil inlet 33 is connected to the oil inlet P8 of the lifting directional control valve 14 through a pipeline.

[0071] As Figure 10 shown, the sequence valve 8, the flow control valve 10, and the horizontal electromagnetic directional control valve 4 are located on the side of the valve block 47, the horizontal relief valve 5 is located on the other side of the valve block assembly, and the first hydraulic control one-way valve 2 and the second hydraulic control one-way valve 3 are located below the valve block assembly.

[0072] As Figure 11 、 Figure 12As shown in the figure, it is the design scheme of the hydraulic valve block assembly in the agricultural machinery hydraulic level control system for improving the priority order of the present invention, where a secondary filter 9 is provided and a proportional valve is not provided. The oil inlet 34 of the secondary filter 9 on the valve block 47 is connected to an oil outlet P1 of the flow control valve 10, and the oil outlet 36 of the secondary filter 9 is connected to the oil inlet ② of the sequence valve 8. The oil inlet and the oil outlet of the secondary filter 9 are respectively connected to the oil inlet C34 of the secondary filter on the valve block 47 and the oil outlet D36 of the secondary filter, and are fixedly connected to the valve block 47 by screws.

[0073] As Figure 13 , Figure 14 shown in the figure, it is the design scheme of the hydraulic valve block assembly in the agricultural machinery hydraulic level control system for improving the priority order of the present invention, where the secondary filter 9 is not provided and a proportional valve 32 is provided. A proportional valve cavity 46 for installing the proportional valve 32 is formed on the valve block 47. The oil inlet of the proportional valve 32 is connected to the oil inlet of the horizontal electromagnetic directional valve 4, the oil inlet of the horizontal relief valve 5, and an oil outlet ③ of the sequence valve 8, and its oil outlet is connected to the oil return port T4 of the horizontal electromagnetic directional valve 4 and the oil outlet T5 of the horizontal relief valve 5.

[0074] As Figure 14 shown in the figure, the proportional valve 32 and the horizontal relief valve 5 are located on the side surface of the valve body 47.

[0075] As Figure 15 , Figure 16 shown in the figure, it is the design scheme of the hydraulic valve block assembly in the agricultural machinery hydraulic level control system for improving the priority order of the present invention, where the secondary filter 9 and the proportional valve 32 are provided.

[0076] As Figure 16 shown in the figure, the flow control valve 10, the sequence valve 8, and the horizontal electromagnetic directional valve 4 are located on the side surface of the valve block 47, the proportional valve 32 and the horizontal relief valve 5 are located on another side surface of the valve block 47, and the secondary filter 9 is located on the upper surface of the valve block 47 and is fixedly connected by screws.

[0077] As Figure 17As shown in the figure, it is the valve block design solution with multiple transformation functions of the present invention. An oil passage connecting the oil inlet C34 and the oil outlet D36 of the secondary filter is provided on the valve block 47. At the same time, a threaded hole communicating with this oil passage and perpendicular to this oil passage, namely the adjustable plug port 37, is provided. When the secondary filter 8 is needed, the oil passage between the oil inlet C34 and the oil outlet D36 of the secondary filter is blocked by the screw in this plug port 37. The hydraulic oil entering the sequence valve cavity 38 from the flow control valve 10 can only enter the secondary filter 9 from the oil inlet C34 of the secondary filter, and then flow to the oil outlet D36 and enter the sequence valve cavity 38. When the secondary filter 9 is not needed, the screw on the oil passage between the oil inlet C34 and the oil outlet D36 of the secondary filter is removed, and the oil inlet C34 and the oil outlet D36 are blocked by bolts, so that the working state without the secondary filter can be achieved.

[0078] When the proportional valve 32 is needed, the proportional valve 32 is installed in the proportional valve cavity 46. When the proportional valve 32 is not needed, the proportional valve cavity 46 is blocked by bolts, so that the working state without the proportional valve 8 can be achieved.

[0079] Such a valve block design with multiple transformation functions is convenient for the production of multiple series of products on one valve block, and has the characteristics of simple structure and low manufacturing cost.

[0080] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A valve block assembly for an agricultural machinery level control system with enhanced priority, characterized in that, Comprising: A valve block (47), a horizontal electromagnetic directional control valve (4), a horizontal relief valve (5), a sequence valve (8), and a flow control valve (10) mounted on the valve block (47). The valve block (47) is also provided with a main inlet port (49), a return port T (40), a lifting inlet port (33), a first horizontal adjustment inlet port A (43), a second horizontal adjustment inlet port B (41), and oil passages. The main inlet port (49) is connected to the inlet port P of the flow control valve (10) through an oil passage. One outlet port of the flow control valve (10) is connected to the lifting inlet port (33) through an oil passage. The other outlet port of the flow control valve (10) is connected to the inlet port of the sequence valve (8) through an oil passage. One outlet port of the sequence valve (8) is connected to the inlet ports of both the horizontal electromagnetic directional control valve (4) and the horizontal relief valve (5) through an oil passage. The other outlet port of the sequence valve (8) is connected to the lifting inlet port (33) through an oil passage. The return port of the horizontal electromagnetic directional control valve (4) and the outlet of the horizontal relief valve (5) are both connected to the return port T (40) through oil passages. The first horizontal adjustment inlet port A (43) and the second horizontal adjustment inlet port B (41) are respectively connected to the two outlet ports of the horizontal electromagnetic directional control valve (4) through oil passages. Among them, a two-way hydraulic lock (44) composed of a first pilot-operated check valve (2) and a second pilot-operated check valve (3) is also mounted on the valve block (47). The two-way hydraulic lock (44) is installed in a two-way hydraulic lock cavity (42). The two-way hydraulic lock (44) has four oil ports. Oil port 4 and oil port 6 are connected to the two outlet ports of the horizontal electromagnetic directional control valve (4), and oil port 5 and oil port 7 are respectively connected to the first horizontal adjustment inlet port A (43) and the second horizontal adjustment inlet port B (41). The valve block (47) also includes a proportional valve (32). The inlet port of the proportional valve (32) is connected to the inlet ports of the horizontal electromagnetic directional control valve (4), the horizontal relief valve (5), and one outlet port of the sequence valve (8) through an oil passage. Its outlet port is connected to the return port of the horizontal electromagnetic directional control valve (4) and the outlet of the horizontal relief valve (5) through an oil passage.

2. The valve block assembly of the agricultural machinery level control system with enhanced priority according to claim 1, wherein, The valve block (47) also includes a secondary filter (9), an inlet port C (34) and an outlet port D (36) of the secondary filter. The inlet port C (34) of the secondary filter is connected to one outlet port of the flow control valve (10) through an oil passage. The outlet port D (36) of the secondary filter is connected to the inlet port of the sequence valve (8) through an oil passage. The inlet port and the outlet port of the secondary filter are respectively connected to the inlet port C (34) and the outlet port D (36) of the secondary filter.

3. The valve block assembly of an agricultural machinery level control system for enhancing priority according to claim 2, characterized in that The valve block (47) also includes an adjustable plug port (37). Threads are provided in the inlet port C (34) and the outlet port D (36) of the secondary filter. An oil passage connecting the inlet port C (34) and the outlet port D (36) of the secondary filter is provided. At the same time, a threaded hole communicating with this oil passage and perpendicular to this oil passage is provided, namely the adjustable plug port (37).

4. A farm machinery level control system with enhanced priority, characterized in that, It includes: A horizontal oil cylinder (1), a first hydraulic control check valve (2), a second hydraulic control check valve (3), a horizontal electromagnetic directional control valve (4), a horizontal relief valve (5), an oil tank (6), a sequence valve (8), a flow control valve (10) and an oil pump (11). The oil outlet of the oil pump (11) is connected to the oil inlet of the flow control valve (10). One oil outlet of the flow control valve (10) is connected to the oil inlet of the sequence valve (8). One oil outlet of the sequence valve (8) is respectively connected to the oil inlet of the horizontal electromagnetic directional control valve (4) and the oil inlet of the horizontal relief valve (5). The other oil outlet of the flow control valve (10) and the other oil outlet of the sequence valve (8) are both connected to the lifting oil inlet (33). The two oil outlets of the horizontal electromagnetic directional control valve (4) are respectively connected to the rod chamber and the rodless chamber of the horizontal oil cylinder (1) through the first hydraulic control check valve (2) and the second hydraulic control check valve (3). The oil return port of the horizontal electromagnetic directional control valve (4) and the oil outlet of the horizontal relief valve (5) are both connected to the oil tank (6). Wherein, one oil outlet of the flow control valve (10) is connected to the oil inlet of the sequence valve (8) through a secondary filter (9). The system further includes a proportional valve (32). The oil inlet of the proportional valve (32) is respectively connected to the oil inlet of the horizontal electromagnetic directional control valve (4), the oil inlet of the horizontal relief valve (5) and one oil outlet of the sequence valve (8). The oil outlet of the proportional valve (32) is connected to the oil return port of the horizontal electromagnetic directional control valve (4) and the oil outlet of the horizontal relief valve (5).

5. The agricultural machinery level control system for enhancing priority according to claim 4, characterized in that, The horizontal electromagnetic directional control valve (4) is a three-position four-way electromagnetic directional control valve, and the sequence valve (8) is a two-position three-way sequence valve.

6. The agricultural machinery level control system for enhancing priority according to claim 4, wherein It further includes a switching solenoid valve (7). One oil outlet of the sequence valve (8) is connected to the oil inlet of the switching solenoid valve (7), and the other oil outlet is connected to the lifting oil inlet (33). One oil outlet of the switching solenoid valve (7) is respectively connected to the oil inlet of the horizontal electromagnetic directional control valve (4) and the oil inlet of the horizontal relief valve (5), and the other oil outlet is connected to the lifting oil inlet (33).

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