An integrated hydraulic system, a grass cutting and flattening work device, and a grass cutting and flattening machine

Abstract

The utility model relates to a kind of integrated hydraulic system, grass cutting and flattening working equipment and grass cutting and flattening machine, it is related to grass cutting and flattening machine field, the import end of each work oil supply pipeline of integrated hydraulic system is equipped with a flow control valve, the load feedback port of each flow control valve is communicated with the multiple shuttle valve import of shuttle valve assembly one-to-one correspondence, the pump feedback port of load sensing pump is communicated with the shuttle valve outlet of shuttle valve assembly, shuttle valve assembly is used to switch to the highest oil pressure of shuttle valve import and is communicated with shuttle valve outlet. Advantageous effect is: using one load sensing pump is for work oil supply pipeline oil supply, avoid the power loss caused by torque multistage transmission, simple structure, pipeline arrangement is simple, save space;Shuttle valve assembly passes through system highest load and is transferred to load sensing pump, automatically regulates pump displacement, avoid the additional power loss caused by surplus flow through overflow valve and flow back to oil tank;More working device is added by parallel work oil supply pipeline, additional working pump is not needed to be added.

Description

Technical Field

[0001] This utility model relates to the field of lawn mowers and flatteners, specifically to an integrated hydraulic system, lawn mower and flattener working equipment, and lawn mower and flattener. Background Technology

[0002] The mower-flattener / dryer can be used for harvesting crops such as alfalfa, oats, reeds, sedges, crested wheat, rapeseed, and milk thistle by changing the flattening or drying platform. It has the advantages of high operating efficiency and good spreading and drying effect.

[0003] Existing lawn mowers / tillers rely on multiple hydraulic pumps to control the rotation of the cooling fan and the raising and lowering of the cutting platform during operation. Therefore, multiple working pumps are required, and torque needs to be transmitted through multiple stages before being input to each working pump. Each working pump controls the fan motor speed and the speed of each cylinder through throttle and relief valves. Too many working pumps result in complex hydraulic pipelines and occupy a lot of space. Traditional hydraulic systems that control the operating speed with throttle valves cause a large amount of hydraulic oil to flow back to the oil tank through the relief valve, increasing the heat generation power of the hydraulic system and causing great energy loss.

[0004] In other words, the problems with existing lawn mowers and flatteners include: 1) Too many working pumps: Multiple gear pumps perform functions such as cooling fan rotation, cutting table lifting, tilting, contouring, flattening roller pressurization, and reel lifting. The torque is transmitted through multiple stages before being input to each working pump, increasing the power loss in the transmission process.

[0005] 2) Too many operating pumps result in complex hydraulic pipelines, occupy a lot of space, and have high costs.

[0006] 3) Throttling speed regulation to achieve the working speed results in a large amount of hydraulic oil returning to the oil tank through the relief valve, causing great energy loss. Utility Model Content

[0007] The technical problem to be solved by this invention is how to achieve the rotation of the fan motor, the action of each oil cylinder, and the speed adjustment through a single pump.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An integrated hydraulic system includes a load-sensitive pump, a flow control valve, a shuttle valve assembly, and multiple working oil supply lines. The flow control valve has a flow inlet, a flow outlet, and a load feedback port. Each working oil supply line has a flow control valve at its inlet end. The flow outlet of the flow control valve is connected to the corresponding working oil supply line. The pump outlet of the load-sensitive pump is connected to the flow inlet of each flow control valve. The load feedback port of each flow control valve is connected to multiple shuttle valve inlets of the shuttle valve assembly in a one-to-one correspondence. The shuttle valve outlet of the shuttle valve assembly is connected to the pump feedback port of the load-sensitive pump. The shuttle valve assembly is used to switch the shuttle valve outlet to be connected to the shuttle valve inlet with the highest oil pressure.

[0009] The beneficial effects of this utility model are: using a single load-sensitive pump instead of multiple gear pumps to supply oil to all working oil supply lines, realizing the rotation of the fan motor, the action of each cylinder, and the speed adjustment, avoiding power loss caused by multi-stage torque transmission, and having a simpler structure, concise pipeline layout, and saving space; feeding back the actual working load to the shuttle valve assembly through each flow control valve, and after selection by the shuttle valve assembly, transmitting the highest load of the system to the load-sensitive pump, automatically adjusting the pump displacement, and preventing excess flow from flowing back to the oil tank through the overflow valve, causing additional power loss; more working devices can be added by connecting parallel working oil supply lines without the need to add additional working pumps.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the flow control valve is a pressure reducing valve or a proportional flow valve.

[0012] Furthermore, the integrated hydraulic system also includes a cooling fan motor, which is connected to the outlet end of one of the working oil supply lines.

[0013] Furthermore, the integrated hydraulic system also includes a header lifting cylinder, a left floating cylinder, a right floating cylinder, and a header tilting cylinder, all mounted on the same working oil supply line via cartridge valves.

[0014] Furthermore, the integrated hydraulic system also includes a brake release cylinder and a fan backflush cylinder, which are installed on the same working oil supply line via cartridge valves.

[0015] Furthermore, the outlet end of one of the working oil supply lines is connected to two working branch lines respectively, and one of the working branch lines is equipped with a flattening roller cylinder, a large guide plate cylinder, a small guide plate cylinder and a guide concave plate cylinder via a cartridge valve.

[0016] Furthermore, on another working branch pipeline, a reel lifting cylinder and a reel translation cylinder are installed via cartridge valves.

[0017] Furthermore, a switching valve is installed on the working oil supply line.

[0018] This utility model also provides a grass-cutting and flattening working device, including the integrated hydraulic system.

[0019] This utility model also provides a grass cutter flattener, including the aforementioned grass cutter flattening working equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the integrated hydraulic system of this utility model.

[0021] The attached diagram lists the components represented by each number as follows: 1. Load-sensitive pump; 2. Shuttle valve assembly; 3. Header lifting cylinder; 4. Left floating cylinder; 5. Right floating cylinder; 6. Header tilting cylinder; 7. Brake release cylinder; 8. Fan backflushing cylinder; 9. Flattening roller cylinder; 10. Large guide plate cylinder; 11. Small guide plate cylinder; 12. Guide plate concave cylinder; 13. Reel lifting cylinder; 14. Reel translation cylinder; 15. Cooling fan motor; 16. Flow control valve. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] Example 1 like Figure 1 As shown, this embodiment provides an integrated hydraulic system, including a load-sensitive pump 1, a flow control valve 16, a shuttle valve assembly 2, and multiple working oil supply lines. The flow control valve 16 has a flow inlet, a flow outlet, and a load feedback port. Each working oil supply line has a flow control valve 16 at its inlet end. The flow outlet of the flow control valve 16 is connected to the corresponding working oil supply line. The pump outlet of the load-sensitive pump 1 is connected to the flow inlet of each flow control valve 16. The load feedback port of each flow control valve 16 is connected to multiple shuttle valve inlets of the shuttle valve assembly 2 in a one-to-one correspondence. The shuttle valve outlet of the shuttle valve assembly 2 is connected to the pump feedback port of the load-sensitive pump 1. The shuttle valve assembly 2 is used to switch the shuttle valve outlet to connect with the shuttle valve inlet with the highest oil pressure.

[0024] In this embodiment, a single load-sensitive pump 1 replaces multiple gear pumps to supply oil to all working oil supply lines, enabling the fan motor to rotate, each cylinder to move, and speed to be adjusted. This avoids power loss caused by multi-stage torque transmission, and the structure is simpler, with a more streamlined pipeline layout, saving space. The actual working load is fed back to the shuttle valve assembly 2 through each flow control valve 16. After selection by the shuttle valve assembly 2, the highest system load (highest oil pressure) is transmitted to the load-sensitive pump 1, automatically adjusting the pump displacement to prevent excess flow from flowing back to the oil tank through the overflow valve, causing additional power loss. More working devices can be added by connecting working oil supply lines in parallel without the need for additional working pumps.

[0025] Specifically, each working oil supply line is used to supply hydraulic oil to one or more working devices.

[0026] Regarding the flow control valve 16, specifically, the load feedback port is used to connect to the pipeline at the flow outlet of the flow control valve 16 and to feed back the load pressure to the valve core of the flow control valve 16, causing the valve core to move and adjust the opening degree from the flow inlet to the flow outlet of the flow control valve 16. Simultaneously, the load feedback port is also used to feed back the load pressure to the shuttle valve inlet of the shuttle valve assembly 2.

[0027] Optionally, the flow control valve 16 is a pressure reducing valve or a proportional flow valve.

[0028] The shuttle valve assembly 2 includes one or more shuttle valves.

[0029] When there are two working oil supply lines, the shuttle valve assembly 2 includes a shuttle valve. The two inlets of the shuttle valve constitute the shuttle valve inlet of the shuttle valve assembly 2, and the outlet of the shuttle valve constitutes the shuttle valve outlet of the shuttle valve assembly 2. The shuttle valve can connect the one with the highest oil pressure among its two inlets to its outlet.

[0030] When there are more than two working oil supply lines, Option 1: Multiple shuttle valves are connected in series. The two inlets of the first shuttle valve constitute two of the shuttle valve inlets of the aforementioned shuttle valve assembly 2. One inlet of each subsequent shuttle valve is connected to the outlet of the previous shuttle valve, and the other inlet of each shuttle valve constitutes a shuttle valve inlet and is connected to the working oil supply line. The outlet of the last shuttle valve constitutes the aforementioned shuttle valve outlet, used to output the highest oil pressure. Option 2: Multiple shuttle valves are divided into multiple groups, with the outlet of each group connected to the inlet of the next group. Taking four working oil supply lines as an example, the first group of shuttle valves has two shuttle valves, and the four inlets of these two shuttle valves constitute the aforementioned shuttle valve inlet. The four shuttle valve inlets are connected one-to-one with the load feedback ports of the flow control valves 16 on the four working oil supply lines. Thus, the hydraulic oil from the four load feedback ports is compared in pairs to obtain the two hydraulic oil paths with higher pressure. These two hydraulic oil paths are connected to the two inlets of one shuttle valve in the second group, and the hydraulic oil with the highest pressure is output from the outlet of the second group of shuttle valves.

[0031] Example 2 Based on Embodiment 1, this embodiment provides a specific connection form for multiple working devices, including but not limited to: header lifting cylinder 3, left floating cylinder 4, right floating cylinder 5, header tilting cylinder 6, brake release cylinder 7, fan back-blowing cylinder 8, flattening roller cylinder 9, large guide plate cylinder 10, small guide plate cylinder 11, guide plate concave cylinder 12, reel lifting cylinder 13, reel translation cylinder 14, and cooling fan motor 15.

[0032] Specifically, such as Figure 1 As shown, this embodiment includes four working oil supply lines. The integrated hydraulic system also includes a cooling fan motor 15, which is connected to the outlet end of the first working oil supply line.

[0033] Furthermore, the integrated hydraulic system also includes a header lifting cylinder 3, a left floating cylinder 4, a right floating cylinder 5, and a header tilting cylinder 6, which are installed on the second working oil supply line via cartridge valves.

[0034] Furthermore, the integrated hydraulic system also includes a brake release cylinder 7 and a fan backflush cylinder 8, which are installed on the third working oil supply line via cartridge valves.

[0035] Furthermore, the outlet end of the fourth working oil supply pipeline is connected to two working branch pipelines respectively. One of the working branch pipelines is equipped with a flattening roller cylinder 9, a large guide plate cylinder 10, a small guide plate cylinder 11, and a guide concave plate cylinder 12 via a cartridge valve.

[0036] Furthermore, on another working branch pipeline, a reel lifting cylinder 13 and a reel translation cylinder 14 are installed via cartridge valves.

[0037] Furthermore, a switching valve is installed on the working oil supply line.

[0038] Optionally, depending on actual working requirements, a switching valve may be installed on one or more of the working oil supply lines.

[0039] Example 3 This embodiment also provides a grass-cutting and flattening device, including the integrated hydraulic system described in embodiment 1 or 2.

[0040] Specifically, in the grass cutting and flattening equipment, the cutting platform is raised and lowered by the lifting cylinder 3 connected to the cutting platform; the cutting platform is shaped by the left floating cylinder 4 and the right floating cylinder 5 in conjunction with the corresponding accumulators; the cutting platform is tilted forward and backward by the tilting cylinder 6; the parking brake is engaged and released by the brake release cylinder 7; the cooling fan is reversed by the fan back-blowing cylinder 8; the flattening roller pressure is adjusted by the flattening roller cylinder 9 in conjunction with the corresponding accumulator; the height of the large guide plate is adjusted by the large guide plate cylinder 10; the height of the small guide plate is adjusted by the small guide plate cylinder 11; the guide plate concave plate is moved inward and outward by the guide plate cylinder 12; the reel is raised and lowered by the lifting cylinder 13; and the reel is moved forward and backward by the reel translation cylinder 14. The aforementioned different functions regulate the pressure difference before and after the throttling orifice of each working device by controlling the pressure of each flow control valve 16, thereby controlling the operating speed of each working device. At the same time, each flow control valve 16 feeds back the downstream pressure to the shuttle valve assembly 2. The shuttle valve assembly 2 inputs the highest pressure among the pressures fed back by each shuttle valve assembly 2 to the load sensitive pump 1. The load sensitive pump 1 automatically adjusts its displacement according to the received pressure signal, accurately controls the system flow, ensures the operating speed of the working device, and avoids the extra flow caused by throttling speed regulation flowing back to the oil tank through the overflow valve, generating heat and causing power loss.

[0041] Cooling fan operation: Due to the special nature of the cooling fan system, the pressure difference of the cooling fan motor 15 corresponds to its speed. Therefore, the speed of the cooling fan can be adjusted by controlling the pressure of the flow control valve 16 corresponding to the cooling fan motor. At the same time, the flow control valve 16 feeds the pressure back to the load-sensitive pump 1 through the shuttle valve assembly 2. The load-sensitive pump 1 automatically adjusts the pump displacement according to the pressure signal, accurately controls the system flow, and avoids excess flow overflowing back to the oil tank to generate heat and cause power loss.

[0042] Example 4 This embodiment also provides a lawn mower flattener, including the lawn mower flattening working equipment described in Embodiment 3.

[0043] The lawn mower also includes a walking mechanism with a chassis mounted on it, and the lawn mower and flattening equipment is mounted on the chassis.

[0044] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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, and are not intended to 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 of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] 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 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 according to the specific circumstances.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated hydraulic system, characterized in that, The system includes a load-sensitive pump (1), a flow control valve (16), a shuttle valve assembly (2), and multiple working oil supply lines. The flow control valve (16) has a flow inlet, a flow outlet, and a load feedback port. Each working oil supply line has a flow control valve (16) at its inlet end. The flow outlet of the flow control valve (16) is connected to the corresponding working oil supply line. The pump outlet of the load-sensitive pump (1) is connected to the flow inlet of each flow control valve (16). The load feedback port of each flow control valve (16) is connected to multiple shuttle valve inlets of the shuttle valve assembly (2) one by one. The shuttle valve outlet of the shuttle valve assembly (2) is connected to the pump feedback port of the load-sensitive pump (1). The shuttle valve assembly (2) is used to switch the shuttle valve outlet to be connected to the shuttle valve inlet with the highest oil pressure.

2. The integrated hydraulic system according to claim 1, characterized in that, The flow control valve (16) is a pressure reducing valve or a proportional flow valve.

3. The integrated hydraulic system according to claim 1, characterized in that, It also includes a cooling fan motor (15) connected to the outlet end of one of the working oil supply lines.

4. An integrated hydraulic system according to claim 1, characterized in that, It also includes a header lifting cylinder (3), a left floating cylinder (4), a right floating cylinder (5), and a header tilting cylinder (6) that are installed on the same working oil supply line via cartridge valves.

5. An integrated hydraulic system according to claim 1, characterized in that, It also includes a brake release cylinder (7) and a fan backflush cylinder (8) installed on the same working oil supply line via a cartridge valve.

6. An integrated hydraulic system according to claim 1, characterized in that, One of the working oil supply lines is connected to two working branch lines at its outlet. One of the working branch lines is equipped with a flattening roller cylinder (9), a large guide plate cylinder (10), a small guide plate cylinder (11), and a guide concave plate cylinder (12) via a cartridge valve.

7. An integrated hydraulic system according to claim 6, characterized in that, Another working branch line is equipped with a reel lifting cylinder (13) and a reel translation cylinder (14) via a cartridge valve.

8. An integrated hydraulic system according to any one of claims 1-7, characterized in that, The working oil supply line is equipped with a switch valve.

9. A grass-cutting and flattening working device, characterized in that, Including the integrated hydraulic system as described in any one of claims 1-8.

10. A lawn mower and flattener, characterized in that, Includes the grass-cutting and flattening equipment as described in claim 9.

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