Harvester reel forward and reverse control valve block assembly with integrated bridge reversal function

Abstract

This invention discloses an integrated harvester reel forward and reverse rotation control valve block assembly with a bridge reversal function. The valve body includes an oil passage, a hydraulic logic valve, a reel forward and reverse rotation proportional valve, a reversing solenoid valve, an overflow valve, a pressure-compensated flow regulating valve, a hydraulic check valve, and a bridge reversal solenoid valve. This invention achieves proportional control of the harvester reel's forward and reverse rotation speeds. Precise control of the reel's rotation speed allows the harvester to adapt to different harvesting targets at different speeds, while avoiding the impact caused by valve switching. The integrated hydraulic logic valve enables automatic unloading, achieving energy saving and consumption reduction. The integrated pressure-compensated flow regulating valve automatically unloads the pressure oil at the pilot end of the hydraulic logic valve, ensuring the sensitivity of the hydraulic logic valve's operation. The integrated bridge reversal function, synchronized with the reel's reverse rotation, enables deep backflow when the harvester's feed rate is too high, reducing the workload of manually clearing blockages and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of combine harvester technology, and more specifically, to a combine harvester reel forward and reverse rotation control valve block assembly with integrated bridge reversal function. Background Technology

[0002] Currently, controlling the reel speed is common in grain combine harvesters, and variations in reel speed allow the harvester to harvest different types of grains. There are many hydraulic control methods for reel speed, such as using a combination of hydraulic speed control valves and hydraulic motors, using volumetric speed control with variable displacement pumps and fixed displacement motors, and using a combination of proportional valves and hydraulic motors, among others.

[0003] While these control methods can achieve speed control of the reel motor and even direction control of the reel, their structures are relatively complex, with low integration and insufficiently compact hydraulic systems. They either cannot achieve reverse rotation or proportional control. Furthermore, current combine harvesters generally lack a bridge reversal function. If the harvester's feed rate is too high, causing deep jamming, blockages enter the bridge and auger. The reel's reverse function alone is insufficient to completely expel these blockages, which are themselves difficult to clear. Therefore, jamming not only affects the harvester's efficiency but can also damage the reel, bridge, and auger. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a harvester reel forward and reverse rotation control valve block assembly integrating a bridge reversal function. This control valve block assembly has a compact structure, provides proportional control of the reel's forward and reverse rotation, and allows for precise setting of the reel's rotation speed to adapt to different harvesting targets, harvesting speeds, and terrains. It integrates a hydraulically controlled logic valve, automatically unloading the system when the reel is not in operation, thus achieving energy savings. Simultaneously, this valve block assembly integrates a bridge reversal function, synchronously controlled with the reel's reverse rotation. When excessive feed into the reel causes blockage, it can simultaneously reverse the bridge and reel, protecting them from damage and reducing the workload of manually clearing blockages. The implementation of this invention can improve driver comfort, reduce driver workload, and increase work efficiency.

[0005] This invention is achieved through the following technical solution:

[0006] A harvester reel forward and reverse rotation control valve block assembly integrating bridge reversal function includes a valve body, on which are provided a reel pressure oil inlet P, a reel forward and reverse rotation return oil inlet T, a reel forward rotation motor inlet RF, a reel reverse rotation motor inlet RR, a bridge reversal cylinder inlet C, a bridge reversal pressure oil inlet P1, a bridge reversal first reel forward and reverse rotation return oil inlet T1, and a bridge reversal second reel forward and reverse rotation return oil inlet T2;

[0007] The valve body is equipped with an oil passage, a hydraulic logic valve, a reel forward and reverse proportional valve, a reversing solenoid valve, an overflow valve, a pressure-compensated flow regulating valve, a hydraulic check valve, a bridge reversing solenoid valve, and a reel flow throttling orifice.

[0008] Oil from the oil pump enters the valve body through the oil inlet P, and then is divided into two main oil circuits through the oil passages in the valve body; the first main oil circuit is connected to the inlet of the hydraulic control logic valve, and the outlet of the hydraulic control logic valve is connected to the reel forward and reverse return oil port T through the oil passage; the second main oil circuit is connected to the oil inlet P3 of the reel forward and reverse proportional valve.

[0009] Furthermore, the oil outlet A1 of the reel forward and reverse proportional valve is divided into two branches. One branch is connected to the oil inlet A4 of the reversing solenoid valve; the other branch is divided into three secondary oil circuits.

[0010] Furthermore, the three secondary oil circuits are as follows:

[0011] The primary oil circuit is connected to the hydraulic control terminal of the hydraulic control check valve;

[0012] The second-stage oil circuit is connected in sequence to the oil inlet of the overflow valve and the pilot end K of the hydraulic control logic valve after passing through the flow throttling orifice j of the reel. The oil outlet T4 of the overflow valve and the oil outlet T3 of the hydraulic control logic valve are both connected to the reel forward and reverse rotation return oil port T on the valve body.

[0013] The third-stage oil circuit is connected to the inlet A2 of the pressure compensation flow regulating valve, and its outlet T5 is connected to the return oil port T of the reel for forward and reverse rotation.

[0014] Furthermore, the oil outlet T7 of the reversing solenoid valve is connected to the shut-off end of the hydraulic control check valve, and the forward end T6 of the hydraulic control check valve is also connected to the forward and reverse return oil port T of the reel; the oil outlet B1 of the reversing solenoid valve is connected to the forward rotation oil inlet RF of the reel motor on the valve body, and the oil outlet B2 of the reversing solenoid valve is connected to the reverse rotation oil inlet RR of the reel motor on the valve body.

[0015] The inlet of the bridge reversing solenoid valve is directly connected to the bridge reversing pressure oil inlet P1 on the valve body; the outlet of the bridge reversing solenoid valve is connected to the bridge reversing cylinder inlet C on the valve body; the return end of the bridge reversing solenoid valve is connected to the first return port T1 and the second return port T2 on the valve body, respectively.

[0016] Furthermore, the reel forward and reverse proportional valve, the reversing solenoid valve, and the bridge reversing solenoid valve are all located on the top of the valve body;

[0017] The overflow valve, the hydraulically controlled check valve, and the hydraulically controlled logic valve are located below the valve body;

[0018] The forward rotation oil inlet RF and the reverse rotation oil inlet RR of the reel motor are both located on the left side of the valve body; the forward and reverse rotation pressure oil inlet P, the forward and reverse rotation return oil inlet T, the bridge reverse rotation pressure oil inlet P1, and the bridge reverse rotation first return oil inlet T1 are all located on the right side of the valve body; the bridge reverse rotation cylinder inlet C and the pressure compensation flow regulating valve are located on the front of the valve body;

[0019] Furthermore, a pressure test port M is provided on the valve body. The pressure test port M is connected to the main oil inlet line through an oil passage and is located on the front of the valve body.

[0020] Furthermore, when the reel of the grain combine harvester is in the holding state, the forward and reverse proportional valve, the reversing solenoid valve and the bridge reversing solenoid valve are all de-energized. After the pressurized oil enters the valve body through port P, it directly enters the third internal oil inlet P3 and enters the lower control circuit of the hydraulic control logic valve. The hydraulic control logic valve opens the oil circuit and automatically unloads.

[0021] When the bridge reversing solenoid valve is de-energized, the oil inlet C of the single-acting bridge reversing cylinder is directly connected to the first return oil port T1 and the second return oil port T on the valve body through the bridge reversing solenoid valve.

[0022] Furthermore, when the reel of the grain combine harvester is rotating in the forward direction, the forward and reverse rotation proportional valve of the reel is energized, and the reversing solenoid valve and the bridge reversing solenoid valve are de-energized. The pressurized oil is connected to the first internal working oil outlet B1 through the second internal oil inlet P4, and connected to the third internal working oil outlet B3 through the reversing solenoid valve, and then directly connected to the forward rotation oil inlet RF of the reel motor.

[0023] Meanwhile, the first internal working oil inlet circuit A1, which is connected to the first internal working oil outlet circuit B1, passes through the reel flow throttling orifice j. One circuit is connected to the pilot control port K of the hydraulic logic valve, which closes the hydraulic logic valve and prevents the pressure oil from being unloaded. The other circuit is directly connected to the oil inlet of the relief valve and the control oil circuit. When the reel motor is overloaded during operation, the relief valve opens to play a role in safety flow restriction.

[0024] The hydraulic control end of the hydraulic control check valve connected to the first internal working oil inlet A1 opens in reverse under the action of pressure oil. The return oil from the reel motor passes through the reel motor reverse oil inlet RR, the second internal working oil outlet B2, the fifth internal return oil outlet T7, the hydraulic control check valve, the fourth internal return oil outlet T6, and the reel forward and reverse return oil outlet T directly back to the oil tank. The pressure compensation flow regulating valve maintains a constant flow rate when the motor is working.

[0025] Furthermore, when the reel is in reverse operation, the reel forward / reverse proportional valve, the reversing solenoid valve, and the bridge reversing solenoid valve are all energized simultaneously. The hydraulic logic valve automatically stops unloading, and the hydraulic check valve reverses the oil circuit. The bridge reversing and the reel reversing are controlled synchronously to achieve the regurgitation function when the combine harvester's feed is too large.

[0026] Furthermore, the reversing solenoid valve is a two-position four-way solenoid reversing valve, whose operation connects the first internal working oil inlet circuit A2 with the first internal working oil outlet circuit B2, the third internal working oil outlet circuit A3 with the fifth internal oil return circuit T7 respectively, thereby realizing the reel motor reversal.

[0027] The bridge solenoid valve is a two-position three-way solenoid directional valve. At this time, the bridge reversal pressure oil is directly connected to the fourth internal working oil outlet B4 through the fifth internal oil inlet P5. The pressure oil enters the bridge reversal cylinder through the oil inlet C of the bridge reversal cylinder, pushing the bridge reversal cylinder to move and realize the reversal of the bridge. The oil passages of the sixth internal return oil passage T8 and the fourth internal working oil outlet B4 are cut off by the bridge reversal solenoid valve.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. This invention integrates a bridge reversal function. The bridge reversal and reel reversal are controlled synchronously, enabling reverse discharge when the harvester's bridge and reel become clogged due to excessive feed. This protects the bridge and reel from damage and reduces the low work efficiency caused by harvester jamming.

[0030] 2. It enables proportional control of the forward and reverse rotation speed of the harvester's reel. The electro-hydraulic actuator proportionally controls the opening of the reel's forward and reverse rotation proportional valve. Working in conjunction with the reversing solenoid valve, it controls the amount of oil entering the reel motor for forward and reverse rotation, thus achieving reel speed control. The proportional action of the electro-hydraulic actuator eliminates pressure fluctuations and shocks caused by the on / off switching of the solenoid valve, achieving flexible control of the reel's forward and reverse rotation process, improving the user's operating experience and driving comfort.

[0031] 3. It features automatic unloading and energy-saving functions. The valve block integrates a hydraulic control logic valve, which is located on the main oil inlet line of the system's pressure oil and connected in parallel with the reel's forward and reverse proportional valve and the pressure test port. When the reel's forward and reverse proportional valve is de-energized, pressure oil enters the hydraulic control end of the hydraulic control logic valve. Since there is no pressure oil or the pressure oil pressure at the pilot end of the hydraulic control logic valve is very low, the pressure oil at the hydraulic control end pushes the valve core to one side of the pilot end, opening the hydraulic control logic valve and guiding the pressure oil to the return port. The pressure oil is automatically unloaded, achieving energy-saving effects.

[0032] 4. An integrated pressure-compensated flow regulating valve ensures normal unloading of the pilot-end pressure oil of the hydraulic logic valve, preventing oil trapping in the oil circuit between the reel's forward / reverse proportional valve and the hydraulic check valve when the reel's forward / reverse proportional valve is de-energized. Simultaneously, the pressure-compensated flow regulating valve is unaffected by downstream circuit load pressure changes, responding to load changes when the pressure difference between upstream and downstream exceeds a set value, maintaining precise flow within a certain pressure range. When used in conjunction with a flow throttle orifice, this valve maintains a constant flow even when pressure fluctuations or significant changes occur during the reel's forward / reverse proportional valve's operation, thus not affecting the normal closure of the hydraulic logic valve or the pressure-limiting overflow function of the relief valve.

[0033] 5. The positions of all oil ports are rationally arranged, and all interfaces and pipelines are convenient for connection and maintenance. At the same time, the structure is compact and small in size, saving installation space. The pressure test port allows for easy testing and monitoring of the entire valve block, enabling quick and accurate identification of problems. Attached Figure Description Figure 1 The accompanying drawing shows the front view of the structure of this invention;

[0034] Figure 2 The attached figure shows the top view of the structure of the present invention;

[0035] Figure 3 The attached diagram shows the left-side structural view of the present invention;

[0036] Figure 4 The attached diagram shows the right-side structural view of the present invention;

[0037] Figure 5 The attached diagram illustrates the hydraulic principle of the reel in the holding state according to the present invention.

[0038] Figure 6 The attached diagram illustrates the hydraulic principle of the reel in the forward rotation state of this invention.

[0039] Figure 7 The attached diagram illustrates the hydraulic principle when the reel is in reverse rotation.

[0040] Reference numerals in the attached diagram: 1. Valve body; 2. Hydraulic control logic valve; 3. Reel forward / reverse proportional valve; 4. Reversing solenoid valve; 5. Relief valve; 6. Pressure-compensated flow regulating valve; 7. Hydraulic control check valve; 8. Bridge reversing solenoid valve. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Example 1

[0045] like Figure 1 As shown, a combined grain harvester reel forward and reverse rotation control valve block assembly integrating a bridge reversal function is used, and is fixed to the left side plate of the combined grain harvester frame by hex bolts. (See attached image) Figure 1 ~Attached Figure 4 As shown, a valve body 1 is provided, on which are provided a reel pressure oil inlet P, a reel forward and reverse rotation return oil inlet T, a pressure test port M, a reel forward rotation motor inlet RF, a reel reverse rotation motor inlet RR, a bridge reverse rotation cylinder inlet C, a bridge reverse rotation pressure oil inlet P1, a bridge reverse rotation first return oil inlet T1, and a bridge reverse rotation second return oil inlet T2; inside the valve body 1 are provided an oil passage, a hydraulic control logic valve 2, a reel forward and reverse rotation proportional valve 3, a reversing solenoid valve 4, an overflow valve 5, a pressure compensation flow regulating valve 6, a hydraulic control check valve 7, a bridge reverse rotation solenoid valve 8, and a reel flow throttling orifice j.

[0046] Oil from the oil pump enters the valve body 1 through the oil inlet P, and then is divided into two main oil circuits through the oil passages inside the valve body 1. The first main oil circuit is connected to the inlet of the hydraulic control logic valve 2, and the outlet of the hydraulic control logic valve 2 is connected to the reel forward and reverse rotation return oil port T through the oil passage. The second main oil circuit is connected to the oil inlet P3 of the reel forward and reverse rotation proportional valve 3, and this oil circuit is also connected to the pressure test port M on the valve body 1. The oil outlet A1 of the reel forward / reverse proportional valve 3 is divided into two branches. One branch is connected to the oil inlet A4 of the reversing solenoid valve 4. The other branch is further divided into three secondary oil circuits: the first secondary oil circuit is connected to the hydraulic control end of the hydraulic control check valve 7; the second secondary oil circuit is connected to the oil inlet of the overflow valve 5 and the pilot end K of the hydraulic control logic valve 2 after passing through the reel flow throttling orifice j; the oil outlet T4 of the overflow valve 5 and the oil outlet T3 of the hydraulic control logic valve 2 are both connected to the reel forward / reverse return oil port T on the valve body 1; the third secondary oil circuit is connected to the oil inlet A2 of the pressure compensation flow regulating valve 6, and the oil outlet T5 is also connected to the reel forward / reverse return oil port T.

[0047] The oil outlet T7 of the reversing solenoid valve 4 is connected to the shut-off end of the hydraulically controlled check valve 7, and the forward end T6 of the hydraulically controlled check valve 7 is also connected to the forward and reverse return oil inlet T of the reel. The oil outlet B1 of the reversing solenoid valve 4 is connected to the forward rotation oil inlet RF of the reel motor on the valve body 1, and similarly, the oil outlet B2 of the reversing solenoid valve 4 is connected to the reverse rotation oil inlet RR of the reel motor on the valve body 1.

[0048] The inlet of the bridge reversing solenoid valve is directly connected to the bridge reversing pressure oil inlet P1 on the valve body 1; the outlet of the bridge reversing solenoid valve 8 is connected to the bridge reversing cylinder inlet C on the valve body 1; and the return end of the bridge reversing solenoid valve 8 is connected to the first return port T1 and the second return port T2 of the bridge reversing solenoid valve 1 respectively.

[0049] As attached Figure 1 ~Attached Figure 4 As shown, the reel forward / reverse proportional valve 3, the reversing solenoid valve 4, and the bridge reversing solenoid valve 8 are located on the top of the valve body 1. The overflow valve 5, the hydraulically controlled check valve 7, and the hydraulically controlled logic valve 2 are located on the bottom of the valve body 1. The reel motor forward and reverse oil inlets are located on the left side of the valve body 1. The reel forward / reverse pressure oil inlet P, the reel forward / reverse return oil inlet T, the bridge reversing pressure oil inlet P1, and the bridge reversing first return oil inlet T1 are located on the right side of the valve body 1. The bridge reversing cylinder inlet C and the pressure compensation flow regulating valve are located on the front of the valve body 1.

[0050] A pressure test port M is also provided on the valve body 1. The pressure test port M is connected to the main oil inlet line through an oil passage to detect the system pressure. The pressure can be used to determine the location of component damage and related experiments. The pressure test port M is located on the front of the valve body 1. The location of the pressure test port M facilitates connection and maintenance.

[0051] The specific internal oil passages and connections between oil ports are as follows: (see attached) Figure 5 As shown, the valve body 1 has 21 internal oil passages, including the first internal oil inlet passage P2, the second internal oil inlet passage P3, the third internal oil inlet passage P4, the fourth internal oil inlet passage P5, the first internal return oil passage T3, the second internal return oil passage T4, the third internal return oil passage T5, the fourth internal return oil passage T6, the fifth internal return oil passage T7, the sixth internal return oil passage T8, the first internal working oil inlet passage A1, the second internal working oil inlet passage A2, the third internal working oil inlet passage A3, the fourth internal working oil inlet passage A4, the fifth internal working oil inlet passage A5, the first internal working oil outlet passage B1, the second internal working oil outlet passage B2, the third internal working oil outlet passage B3, the fourth internal working oil outlet passage B4, and the pilot control oil passage K of the hydraulic logic valve.

[0052] As attached Figure 5 As shown, the oil inlet P is connected to the first internal oil inlet P2, which in turn is connected to the third internal oil inlet P3, forming the first main oil inlet. The first internal return oil inlet T3 is always connected to the reel's forward and reverse return oil inlet T. The first internal oil inlet P2 is connected to the second internal oil inlet P4, forming the second main oil inlet. The first internal working oil outlet B1 is connected to the first internal working oil inlet A1 and the second internal working oil inlet A2. The second internal working oil inlet A2, after passing through the reversing solenoid valve 4, is connected to either the third internal working oil outlet B3 or the second internal working oil outlet B2. The third internal working oil outlet B3 is always connected to the reel motor's forward rotation oil inlet RF. Similarly, the fifth internal return oil inlet T7 can also be connected to either the second internal working oil outlet B2 or the third internal working oil outlet B3. The second internal working oil outlet B2 is also always connected to the reel motor's reverse rotation oil inlet RR. Meanwhile, the fifth internal oil return circuit T7 connects to the fourth internal oil return circuit T6 via the hydraulic control check valve 7 in reverse. The fourth internal oil return circuit T6 is always connected to the reel's forward and reverse rotation oil return port T. The first internal working oil inlet circuit A1 is connected to the third internal working oil inlet circuit A3, the fifth internal working oil inlet circuit A5, and the hydraulic control end of the hydraulic control check valve 7 via oil circuits. The fifth internal working oil inlet circuit A5 is connected to the third internal oil return circuit T5 via the pressure compensation flow regulating valve 6. The third internal oil return circuit T5 is always connected to the reel's forward and reverse rotation oil return port T. After passing through the flow throttling orifice j of the reel, the third internal working oil inlet A3 is connected to the pilot control oil circuit K of the hydraulic logic valve 2; the other is connected to the fourth internal working oil inlet A4. The fourth internal working oil inlet A4 is simultaneously connected to the oil inlet of the relief valve 5 and the control oil circuit. When the relief valve 5 is open, the fourth internal working oil inlet A4 is connected to the second internal return oil circuit T4, which is in turn connected to the forward and reverse return oil port T of the reel.

[0053] The inlet of the bridge reversing solenoid valve is connected to the fifth internal oil inlet circuit P5, which is directly connected to the bridge reversing pressure oil inlet P1 on the valve body 1; the outlet of the bridge reversing solenoid valve 8 is connected to the fourth internal working oil outlet circuit B4, which is always connected to the bridge reversing cylinder inlet C on the valve body 1; the return end of the bridge reversing solenoid valve 8 is connected to the sixth internal return circuit T8, which is connected to the first bridge reversing return port T1 and the second bridge reversing return port T2 on the valve body 1 respectively.

[0054] As attached Figure 5 As shown in Table 1 ("+" indicates the solenoid valve is energized; "-" indicates the solenoid valve is de-energized), when the proportional valve 3 for forward and reverse rotation of the grain harvester's reel, the reversing solenoid valve 4, and the bridge reversing solenoid valve 8 are all de-energized, the reel remains in a holding state. Pressurized oil enters the valve body 1 through port P and directly enters the third internal inlet P3, then enters the lower end (non-spring end) control circuit of the hydraulic control logic valve 2. Its pressure is equal to the inlet oil pressure. Since there is no pressurized oil or the pressurized oil pressure is very low in the pilot end (spring end) control oil circuit K of the hydraulic control logic valve 2 at this time, the pressure on the left side of the hydraulic control logic valve 2 is greater than the sum of its pilot pressure and spring force, pushing the valve core of the hydraulic control logic valve 2 to move upwards. The hydraulic control logic valve 2 opens the oil circuit, automatically unloads, and avoids energy loss in the hydraulic system. Because valve body 1 integrates a pressure-compensated flow regulating valve 6, oil trapping between the reel reversing proportional valve 2 and the hydraulic control check valve 7 is avoided when the reel reversing proportional valve 2 is de-energized. Simultaneously, the pressure-compensated flow regulating valve 6 is unaffected by changes in downstream circuit load pressure, maintaining precise flow throughout the entire operation. When used in conjunction with the reel flow throttling orifice j, the pressure-compensated flow regulating valve 6 can maintain a constant flow even when pressure fluctuates or changes significantly, thus ensuring the normal closure of the hydraulic control logic valve 2 and the pressure-limiting overflow function of the relief valve 5.

[0055] When the bridge reversing solenoid valve 8 is de-energized, the oil inlet C of the single-acting bridge reversing cylinder is directly connected to the first return oil port T1 and the second return oil port T2 of the bridge reversing cylinder on the valve body 1 through the bridge reversing solenoid valve 8, and the load is automatically unloaded.

[0056] Table 1. Energized and de-energized states of the solenoid valve when the reel is in various states.

[0057]

[0058] As attached Figure 6As shown in Table 1, when the reel of the grain combine harvester is rotating forward, the reel forward / reverse proportional valve 3 is energized, while the reversing solenoid valve 4 and the bridge reversing solenoid valve 8 are de-energized. Pressure oil flows through the second internal inlet P4 to the first internal working outlet B1, and through the reversing solenoid valve 4 to the third internal working outlet B3, thus directly connecting to the reel motor forward inlet RF, causing the reel to rotate forward. The opening of the reel forward / reverse proportional valve 3 can be proportionally controlled by an electronic proportional signal, thereby controlling the amount of oil entering the reel motor and achieving speed control of the reel motor's forward rotation. Simultaneously, the first internal working inlet A1, connected to the first internal working outlet B1, passes through the reel flow throttling orifice j and connects to the pilot control port K of the hydraulic logic valve 2. At this time, the pressure on the upper side of the valve core of the hydraulic logic valve 2 is greater than the pressure on the lower side, pushing the valve core downward and closing the hydraulic logic valve 2, preventing pressure oil unloading and ensuring sufficient supply of working pressure oil. Another path is directly connected to the oil inlet of the overflow valve 5 and the control oil circuit. When the reel motor is overloaded during operation, the overflow valve 5 opens to play a role in safety flow restriction.

[0059] Additionally, the hydraulic control valve 7, which is also connected to the first internal working oil inlet circuit A1, opens in reverse under the action of pressurized oil. The return oil from the reel motor sequentially flows through the reel motor reverse inlet RR, the second internal working oil outlet circuit B2, the fifth internal return oil circuit T7, the hydraulic control valve 7, the fourth internal return oil circuit T6, and the reel forward / reverse return oil inlet T directly back to the oil tank. The pressure-compensated flow regulating valve 6 maintains a constant flow rate during motor operation, ensuring the sensitivity of the overflow valve 5 and the hydraulic control logic valve 2. The bridge reversing solenoid valve 8 is de-energized at this time, and the bridge is in the forward rotation state.

[0060] As attached Figure 7 As shown in Table 1, the reel is in reverse operation. In this state, the reel forward / reverse proportional valve 3, the reversing solenoid valve 4, and the bridge reversing solenoid valve 8 are all energized simultaneously. Following the same principle as when the reel is rotating forward, the hydraulic logic valve 2 automatically stops unloading, and the hydraulic check valve 7 reverses the oil flow. Similarly, the electro-proportional signal controls the opening degree of the reel forward / reverse proportional valve 3, allowing the reel to reverse at a controlled speed.

[0061] Unlike the forward rotation of the reel motor, the reversing solenoid valve 4 is a two-position four-way solenoid reversing valve. Its operation connects the first internal working oil inlet circuit A2 and the first internal working oil outlet circuit B2, the third internal working oil outlet circuit A3 and the fifth internal oil return circuit T7 respectively, thereby realizing the reverse rotation of the reel motor.

[0062] The bridge solenoid valve 8 is synchronously energized. The bridge solenoid valve 8 is a two-position three-way solenoid directional valve. At this time, the bridge reversing pressure oil is directly connected to the fourth internal working outlet oil circuit B4 through the fifth internal oil inlet P5. The pressure oil enters the bridge reversing cylinder through the inlet C, driving the cylinder to actuate and achieving bridge reversal. The sixth internal return oil circuit T8 and the fourth internal working outlet oil circuit B4 are disconnected by the bridge reversing solenoid valve 8.

[0063] The bridge reversal and the reel reversal move synchronously and work together to achieve the regurgitation function when the harvester feeds too much, so as to maximize the protection of the harvester's reel and bridge from damage caused by jamming.

[0064] In summary, when the reel of the grain combine harvester is in the holding state, the inlet pressure oil returns directly to the oil tank for unloading via the hydraulic control logic valve. When the reel forward / reverse proportional valve is energized, and both the reversing solenoid valve and the bridge reversing solenoid valve are de-energized, the pressure oil connects to the forward rotation inlet of the reel motor via the reversing solenoid valve, causing the reel motor to rotate forward. The amount of oil entering the reel motor is controlled according to the opening of the proportional valve, thereby controlling the forward rotation speed of the motor. At this time, the hydraulic control check valve reverses the flow of pressure oil, opening the return oil path of the motor. Simultaneously, after passing through the reel flow throttling orifice, the pressure oil connects to the pilot control port of the hydraulic logic valve, causing the hydraulic control logic valve to close and preventing pressure oil unloading. The control oil circuit of the relief valve constantly monitors the working pressure; once the safety set pressure is exceeded, the relief valve activates its pressure stabilization and flow limiting function. The pressure compensation flow valve maintains a constant discharge flow rate, ensuring the sensitivity of the hydraulic control logic valve. When the reel's forward / reverse proportional valve, reversing solenoid valve, and bridge reversal solenoid valve are all energized, the reel and bridge synchronously enter the reverse state. Following the same principle as when the reel rotates forward, the hydraulic logic valve automatically stops unloading, and the hydraulic check valve reverses the flow of hydraulic motor return oil. The opening of the proportional valve controls the speed of motor reversal. The bridge reversal solenoid valve is synchronously energized, at which point the bridge reversal pressure oil enters the bridge reversal cylinder through the solenoid valve, pushing the cylinder to actuate and achieve bridge reversal. The bridge reversal and reel reversal move synchronously, working in conjunction to achieve a regurgitation function when the harvester's feed rate is too high, maximizing protection of the harvester's reel and bridge from damage caused by jamming.

[0065] The foregoing has shown and described the main features, basic principles, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention based on actual circumstances without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A combine harvester reel forward and reverse control valve block assembly integrated with a bridge reversal function, characterized in that: Includes valve body (1), on which are provided a reel pressure oil inlet P, a reel forward and reverse rotation return oil inlet T, a reel forward rotation motor inlet RF, a reel reverse rotation motor inlet RR, a bridge reverse rotation cylinder inlet C, a bridge reverse rotation pressure oil inlet P1, a bridge reverse rotation first reel forward and reverse rotation return oil inlet T1, and a bridge reverse rotation second reel forward and reverse rotation return oil inlet T2; The valve body (1) is equipped with a hydraulic control logic valve (2), a reel forward and reverse proportional valve (3), a reversing solenoid valve (4), an overflow valve (5), a pressure compensation flow regulating valve (6), a hydraulic control check valve (7), a bridge reversing solenoid valve (8), and a reel flow throttling orifice j. Oil from the oil pump enters the valve body (1) through the pressure oil inlet P of the reel, and then is divided into two main oil circuits through the oil passages inside the valve body (1); the first main oil circuit is connected to the inlet of the hydraulic control logic valve (2), and the outlet of the hydraulic control logic valve (2) is connected to the reel forward and reverse return oil inlet T through the oil passage; the second main oil circuit is connected to the inlet P3 of the reel forward and reverse proportional valve (3); the outlet A1 of the reel forward and reverse proportional valve (3) is divided into two branches, one of which is connected to the inlet A4 of the reversing solenoid valve (4); the other branch is divided into three secondary oil circuits; the three secondary oil circuits are as follows: The primary oil circuit is connected to the hydraulic control terminal of the hydraulic control check valve (7); After passing through the flow throttle hole j of the reel, the second-stage oil circuit is connected in sequence to the oil inlet of the overflow valve (5) and the pilot end K of the hydraulic control logic valve (2). The oil outlet T4 of the overflow valve (5) and the oil outlet T3 of the hydraulic control logic valve (2) are both connected to the reel forward and reverse return oil port T on the valve body (1). The third-stage oil circuit is connected to the inlet A2 of the pressure compensation flow regulating valve (6), and its outlet T5 is connected to the reel forward and reverse return oil port T; the outlet T7 of the reversing solenoid valve (4) is connected to the shut-off end of the hydraulic control check valve (7), and the forward end T6 of the hydraulic control check valve (7) is also connected to the reel forward and reverse return oil port T; the outlet B1 of the reversing solenoid valve (4) is connected to the forward rotation inlet RF of the reel motor on the valve body (1), and the outlet B2 of the reversing solenoid valve (4) is connected to the reverse rotation inlet RR of the reel motor on the valve body (1); The inlet of the bridge reversing solenoid valve (8) is directly connected to the bridge reversing pressure oil inlet P1 on the valve body (1); the outlet of the bridge reversing solenoid valve (8) is connected to the bridge reversing cylinder inlet C on the valve body (1); the return end of the bridge reversing solenoid valve (8) is connected to the first return port T1 and the second return port T2 of the bridge reversing solenoid valve (1) on the valve body (1) respectively.

2. The harvester reel forward and reverse rotation control valve block assembly with integrated bridge reversal function as described in claim 1, characterized in that: The reel forward and reverse proportional valve (3), the reversing solenoid valve (4) and the bridge reversing solenoid valve (8) are all located on the top of the valve body (1); The overflow valve (5), the hydraulic check valve (7) and the hydraulic logic valve (2) are located below the valve body (1); The forward rotation oil inlet RF and the reverse rotation oil inlet RR of the reel motor are both located on the left side of the valve body (1); the forward and reverse rotation pressure oil inlet P, the forward and reverse rotation return oil inlet T, the bridge reverse rotation pressure oil inlet P1, and the bridge reverse rotation first return oil inlet T1 are all located on the right side of the valve body (1); the bridge reverse rotation cylinder inlet C and the pressure compensation flow regulating valve (6) are located on the front of the valve body (1).

3. The harvester reel forward and reverse rotation control valve block assembly with integrated bridge reversal function as described in claim 1, characterized in that: A pressure test port M is also provided on the valve body (1). The pressure test port M is connected to the main oil inlet line through the oil passage. The pressure test port M is located on the front of the valve body (1).

4. The combine harvester reel forward-reverse control valve block assembly integrated with a bridge-reversing function according to claim 1, characterized in that: When the grain combine harvester reel is in the holding state, the forward and reverse proportional valve (3), the reversing solenoid valve (4) and the bridge reversing solenoid valve (8) are all de-energized. After the pressurized oil enters the valve body (1) through the P port, it directly enters the third internal oil inlet P3 and enters the lower control circuit of the hydraulic control logic valve (2). The hydraulic control logic valve (2) opens the oil circuit and automatically unloads. When the bridge reversing solenoid valve (8) is de-energized, the oil inlet C of the single-acting bridge reversing cylinder is directly connected to the first reversing reel forward and reverse oil return port T1 and the second reversing reel forward and reverse oil return port T2 on the valve body (1) through the bridge reversing solenoid valve (8).

5. The harvester reel forward-reverse control valve block assembly integrated with the over- center reverse function according to claim 1, characterized in that: When the reel of the grain combine harvester is in the forward rotation state, the forward and reverse rotation proportional valve (3) of the reel is energized, the reversing solenoid valve (4) and the bridge reversing solenoid valve (8) are de-energized, the pressure oil is connected to the first internal working oil outlet B1 through the second internal oil inlet P4, and connected to the third internal working oil outlet B3 through the reversing solenoid valve (4), and then directly connected to the forward rotation oil inlet RF of the reel motor; Meanwhile, the first internal working oil inlet circuit A1, which is connected to the first internal working oil outlet circuit B1, passes through the reel flow throttle hole j and is connected to the pilot end control oil port K of the hydraulic logic valve (2) to close the hydraulic logic valve (2) and prevent the pressure oil from being unloaded; the other circuit is directly connected to the oil inlet of the relief valve (5) and the control oil circuit. When the reel motor is overloaded during operation, the relief valve (5) opens to play a role in safety flow restriction. The hydraulic control end of the hydraulic control check valve (7) connected to the first internal working oil inlet circuit A1 is opened in reverse under the action of pressure oil. The return oil of the reel motor passes through the reel motor reverse oil inlet RR, the second internal working oil outlet circuit B2, the fifth internal return oil circuit T7, the hydraulic control check valve (7), the fourth internal return oil circuit T6 and the reel forward and reverse return oil inlet T directly back to the oil tank. The pressure compensation flow regulating valve (6) maintains a constant flow when the motor is working.

6. The harvester reel forward and reverse rotation control valve block assembly with integrated bridge reversal function as described in claim 1, characterized in that: When the reel is in reverse working state, the reel forward and reverse proportional valve (3), the reversing solenoid valve (4) and the bridge reversing solenoid valve (8) are all energized at the same time. The hydraulic logic valve (2) automatically stops unloading, and the hydraulic check valve (7) reverses the oil circuit. The bridge reversing and the reel reversing are controlled synchronously to realize the regurgitation function when the combine harvester feeds too much.

7. The harvester reel forward and reverse rotation control valve block assembly with integrated bridge reversal function as described in claim 6, characterized in that: The reversing solenoid valve (4) is a two-position four-way solenoid reversing valve. Its operation connects the first internal working oil inlet circuit A2 with the first internal working oil outlet circuit B2, the third internal working oil outlet circuit A3 with the fifth internal oil return circuit T7 respectively, thereby realizing the reversal of the reel motor. The bridge reversing solenoid valve (8) is a two-position three-way solenoid directional valve. At this time, the bridge reversing pressure oil is directly connected to the fourth internal working oil outlet B4 through the fifth internal oil inlet P5. The pressure oil enters the bridge reversing oil cylinder through the oil inlet C of the bridge reversing oil cylinder, pushing the bridge reversing oil cylinder to move and realize the reversal of the bridge. The oil circuits of the sixth internal return oil circuit T8 and the fourth internal working oil outlet B4 are cut off by the bridge reversing solenoid valve (8).

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