Hydraulic control system and method for folding corn header and harvester

Abstract

The invention provides a hydraulic control system and method for a folding corn header and a harvester. A hydraulic control system of a folding corn header comprises an ear picking plate gap adjusting oil cylinder, a first hydraulic lock, a folding oil cylinder, a double-balance valve, a flow distributing and collecting valve, an electromagnetic reversing valve, a sequence valve, a divider shield tilting oil cylinder, a second hydraulic lock and a hydraulic locking oil cylinder. The first hydraulic lock, the double-balance valve, the flow distributing and collecting valve, the sequence valve and the second hydraulic lock are respectively connected with the electromagnetic directional valve through pipelines, the ear picking plate gap adjusting oil cylinder is connected with the first hydraulic lock through a pipeline, the double-balance valve is connected with the flow distributing and collecting valve through a pipeline, and the sequence valve is connected with the second hydraulic lock through a pipeline. The folding oil cylinder is connected with the double-balance valve through a pipeline, the second hydraulic lock is connected with the sequence valve through a pipeline, and the divider shield tilting oil cylinder and the hydraulic locking oil cylinder are connected with the second hydraulic lock through pipelines.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control of a harvester header, and particularly relates to a hydraulic control system and method for a folding corn header and a harvester. Background Art

[0002] Folding corn headers are mainly applied in the agricultural machinery field of developed countries. Among them, the hydraulic control system is the key technology to realize functions such as folding / unfolding of the folding corn header and adjustment of the ear plate gap. At present, non-foldable ordinary large corn headers are commonly used in China. To address the limitations of traditional headers, foldable corn headers have become an important research direction in recent years. Through the foldable design, the body length during transportation and non-operation is significantly reduced, improving the mobility and storage convenience of the machine, especially suitable for operating in small plots or hilly areas. At present, developed countries have promoted the technology of replacing the folding header on combine harvesters to achieve "one machine with multiple functions" and reduce the costs of farmers. Domestic related research focuses on structural optimization and reliability improvement, but overall still faces challenges such as insufficient technical maturity and the need to strengthen the stability of the hydraulic system.

[0003] At present, the hydraulic system of folding corn headers of foreign manufacturers has few designed functions. The common hydraulic system of folding corn headers has a single hydraulic function, only having the functions of side auger rotation and header folding. The header folding cylinder integrates a hydraulic lock to ensure the stability of the header during the positive and negative load switching in the header folding process. However, the performance of the hydraulic lock is less than satisfactory, and there is a slight jitter during the header folding process. The lifting of the divider guard is only achieved by a mechanical structure, and there is a risk of damage to mechanical structural parts due to the falling of the guard during transportation. Due to the inconsistent weights on the left and right sides of this header, the two sides of the header are not synchronized during the unfolding and folding processes.

[0004] For the hydraulic system of another foreign manufacturer's folding header, the header folding function and the lifting function of the divider guard are driven by hydraulic cylinders; a double-headed balance valve is used to ensure the stability of the header unfolding and folding, and the sequence valve is used for the lifting function of the divider guard.

[0005] The current hydraulic system technology of folding headers has the following disadvantages:

[0006] 1. Using a hydraulic lock or sharing a balance valve by two cylinders results in jitter during the header unfolding / folding process.

[0007] 2. The unfolding / folding of the two sides of the header is not synchronized, with one side being fast and the other side being slow, or one side folding first and then the other side.

[0008] 3. During the header unfolding / folding process, due to the large mass of the header and the switching of positive and negative loads, if the hydraulic system cannot make timely adjustments and change the acting direction, it will cause the header to fall too fast or even drop by its own weight, posing a great safety hazard.

[0009] 4. The hydraulic system has fewer functions. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a hydraulic control system and method for a folding corn header and a harvester in view of the deficiencies of the prior art.

[0011] The technical solution of the present invention to solve the above technical problems is as follows: A hydraulic control system for a folding corn header includes: a header board clearance adjustment oil cylinder, a first hydraulic lock, a folding oil cylinder, a double balance valve, a flow dividing and collecting valve, an electromagnetic directional valve, a sequence valve, a divider shield tilting oil cylinder, a second hydraulic lock, and a hydraulic locking oil cylinder. The first hydraulic lock, the double balance valve, the flow dividing and collecting valve, the sequence valve, and the second hydraulic lock are respectively connected to the electromagnetic directional valve through pipelines. The header board clearance adjustment oil cylinder is connected to the first hydraulic lock through a pipeline. The double balance valve is connected to the flow dividing and collecting valve through a pipeline. The folding oil cylinder is connected to the double balance valve through a pipeline. The second hydraulic lock is connected to the sequence valve through a pipeline. The divider shield tilting oil cylinder and the hydraulic locking oil cylinder are respectively connected to the second hydraulic lock through pipelines.

[0012] The beneficial effects of adopting the technical solution of the present invention are as follows: The flow dividing and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to two branches, so that the volume of the oil entering / flowing out of the folding oil cylinder is the same, ensuring the synchronous movement of the two folding oil cylinders. The use of the flow dividing and collecting valve + double balance valve realizes the synchronism and stability during the unfolding / folding process of the header. The electromagnetic directional valve is used to realize the switching between the header board clearance adjustment function and the header folding function. The sequence valve is used to realize the action sequence of the folding oil cylinder, the divider shield tilting oil cylinder, and the hydraulic locking oil cylinder. The sequential action of multiple functions of the folding corn header is effectively realized. The second hydraulic lock is used to maintain the states of the divider shield tilting oil cylinder and the hydraulic locking oil cylinder. The header is provided with functions such as header folding, divider shield tilting, hydraulic locking, and header board clearance adjustment. The problem of asynchronous unfolding / folding of the header is avoided, the problem of jitter during the unfolding / folding process of the header is solved, the hydraulic locking function after unfolding is increased, the stability during the working process of the header is enhanced, and the safety during the unfolding / folding process is ensured.

[0013] Further, the large chamber of the divider shield tilting oil cylinder is connected to the small chamber of the hydraulic locking oil cylinder through a pipeline; the small chamber of the divider shield tilting oil cylinder is connected to the large chamber of the hydraulic locking oil cylinder through a pipeline.

[0014] The beneficial effect of adopting the above further technical solution is that the large chamber of the divider shield tilting oil cylinder is connected to the small chamber of the hydraulic locking oil cylinder, and the second hydraulic lock is used to maintain the states of the divider shield tilting oil cylinder and the hydraulic locking oil cylinder.

[0015] Further, the number of the folding oil cylinders and the double check valves is two each. The two folding oil cylinders are respectively connected to the two double check valves through pipelines, and the two double check valves are respectively connected to the flow dividing and collecting valve through pipelines.

[0016] The beneficial effects of adopting the above further technical solution are as follows: Each of the two folding oil cylinders is equipped with a double check valve. The two double check valves ensure the stability of the folding oil cylinder during the positive and negative load switching. The use of the flow dividing and collecting valve + double check valve realizes the synchronism and stability during the unfolding / folding process of the cutter bar.

[0017] Further, the electromagnetic directional control valve is a two-position six-way electromagnetic directional control valve.

[0018] The beneficial effects of adopting the above further technical solution are as follows: The two-position six-way electromagnetic directional control valve is used to realize the switching between the ear stripper gap adjustment / cutter bar folding functions.

[0019] Further, an overflow valve is connected to the pipeline between the ear stripper gap adjustment oil cylinder and the first hydraulic lock. A check valve is integrated in the overflow valve, and the overflow valve is connected to the pipeline between the flow dividing and collecting valve and the electromagnetic directional control valve through a pipeline.

[0020] The beneficial effects of adopting the above further technical solution are as follows: The overflow valve is used to prevent the ear stripper gap adjustment oil cylinder and the structural parts from being damaged. The check valve is integrated in the overflow valve to prevent the high-pressure oil from entering the ear stripper gap adjustment oil cylinder, thus ensuring that the ear stripper gap adjustment oil cylinder will not malfunction.

[0021] Further, the number of the ear stripper gap adjustment oil cylinders, the divider guard lifting oil cylinders and the hydraulic locking oil cylinders is two each. The two ear stripper gap adjustment oil cylinders are both connected to the first hydraulic lock through pipelines, and the two divider guard lifting oil cylinders and the two hydraulic locking oil cylinders are respectively connected to the second hydraulic lock through pipelines.

[0022] The beneficial effects of adopting the above further technical solution are as follows: The setting of the double oil cylinders improves the stability and reliability of the system. It is convenient to adapt to the cutter bar structure.

[0023] Further, the electromagnetic directional control valve is connected with a quick connector.

[0024] The beneficial effects of adopting the above further technical solution are as follows: The setting of the quick connector facilitates the connection between the electromagnetic directional control valve and other components, and is convenient for the installation and maintenance of the system.

[0025] In addition, the present invention also provides a harvester, including a folding corn cutter bar hydraulic control system according to any one of the above.

[0026] The beneficial effects of adopting the technical solution of the present invention are as follows: The flow dividing and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to two branches, so that the volume of the oil flowing into / out of the folding cylinder is the same, ensuring the synchronous movement of the two folding cylinders. The use of a flow dividing and collecting valve + double balance valve realizes the synchronism and stability during the unfolding / folding process of the header. The electromagnetic directional control valve is used to realize the switching between the ear plate gap adjustment function and the header folding function. The use of a sequence valve realizes the action sequence of the folding cylinder, the divider guard lifting cylinder, and the hydraulic locking cylinder. The sequential action of multiple functions of the folding corn header is effectively realized. The second hydraulic lock is used to maintain the states of the divider guard lifting cylinder and the hydraulic locking cylinder. The header is provided with functions of header folding, divider guard lifting, hydraulic locking, and ear plate gap adjustment. It avoids the problem of asynchronous unfolding / folding of the header, solves the problem of jitter during the unfolding / folding process of the header, adds the hydraulic locking function after unfolding, enhances the stability during the working process of the header, and ensures the safety during the unfolding / folding process.

[0027] In addition, the present invention also provides a hydraulic control method for a folding corn header. Based on the hydraulic control system for a folding corn header described in any one of the above, the hydraulic control method for a folding corn header includes: when the header needs to be unfolded in the folded state, control the electromagnetic directional control valve to be energized, so that the folding cylinder extends; under the flow dividing action of the flow dividing and collecting valve, the two folding cylinders extend synchronously, realizing the synchronous unfolding of the two sides of the header; and under the action of the double balance valve, ensure the stability of the two folding cylinders during the positive and negative load switching; when the header is fully unfolded, the pressure starts to build up in front of the sequence valve; when the pressure reaches the opening pressure of the sequence valve, the sequence valve opens, so that the divider guard lifting cylinder contracts and the hydraulic locking cylinder extends, realizing the lowering of the divider guard and the locking of the hydraulic locking cylinder, and completing the header unfolding work.

[0028] The beneficial effects of adopting the technical solution of the present invention are as follows: When the cutter bar is unfolded, by operating the electric control handle, the two-position six-way electromagnetic reversing valve is energized. After the electromagnetic is energized, it pushes the corresponding spool to move. The working valve is in the right position. Press the reel forward button to make the large chamber of the folding cylinder receive oil. Due to the forced flow splitting function of the flow splitting and collecting valve, the oil return volumes of the small chambers of the left and right folding cylinders are exactly the same, enabling the cutter bars on both sides to be unfolded synchronously. Two double balance valves ensure the stability of the folding cylinder during the positive and negative load switching. When the cutter bar is fully unfolded, pressure begins to build up in front of the sequence valve. When the pressure reaches the opening pressure of the sequence valve, the sequence valve opens, and the small chamber of the divider shield tilting cylinder and the large chamber of the hydraulic locking cylinder receive oil. At this time, the divider shield drops, and the hydraulic locking cylinder locks. When the hydraulic locking cylinder extends, it locks the foldable part of the cutter bar. At this time, the cutter bar is fully unfolded and can be lowered to the field for harvesting operations. The flow splitting and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to the two branches, so that the volume of the oil entering / flowing out of the folding cylinder is the same, ensuring the synchronous operation of the two folding cylinders. The use of a flow splitting and collecting valve + double balance valve realizes the synchronism and stability during the unfolding / folding process of the cutter bar. The electromagnetic reversing valve is used to realize the switching between the ear stripper gap adjustment function and the cutter bar folding function. The sequence valve is used to realize the action sequence of the folding cylinder, the divider shield tilting cylinder, and the hydraulic locking cylinder. Effectively realizing the sequential action of multiple functions of the foldable corn cutter bar. The second hydraulic lock is used to maintain the states of the divider shield tilting cylinder and the hydraulic locking cylinder. The cutter bar is equipped with functions such as cutter bar folding, divider shield tilting, hydraulic locking, and ear stripper gap adjustment. It avoids the problem of asynchronous unfolding / folding of the cutter bar, solves the problem of jitter during the unfolding / folding process of the cutter bar, adds the hydraulic locking function after unfolding, enhances the stability during the working process of the cutter bar, and ensures the safety during the unfolding / folding process.

[0029] Further, after the cutter bar unfolding work is completed, control the electromagnetic reversing valve to lose power; adjust the ear stripper gap by controlling the telescopic movement of the ear stripper gap adjustment cylinder; when the ear stripper gap adjustment cylinder is under pressure, release the hydraulic oil in the ear stripper gap adjustment cylinder to the low-pressure oil circuit through the relief valve; when the cutter bar needs to be folded in the unfolded state, control the electromagnetic reversing valve to be energized, so that the divider shield tilting cylinder extends and the hydraulic locking cylinder contracts, realizing the unlocking of the hydraulic locking cylinder and the tilting of the divider shield; after the unlocking of the hydraulic locking cylinder and the tilting of the divider shield are completed, under the flow splitting effect of the flow splitting and collecting valve, the two folding cylinders contract synchronously, realizing the synchronous folding of the cutter bars on both sides; through the check valve integrated in the relief valve, prevent high-pressure oil from entering the ear stripper gap adjustment cylinder.

[0030] The beneficial effects of adopting the above further technical solution are as follows: After the unfolding is completed, the electromagnet of the two-position six-way electromagnetic directional valve loses power, and the spool moves under the action of the spring, and the two-position six-way electromagnetic directional valve returns to the left position. At this time, if the electric control handle is operated and the button for the reel to move forward or the reel to move backward is pressed, the ear stripper gap adjusting cylinder moves to adjust the ear stripper gap. Since the ear stripper gap adjusting cylinders are placed on both sides of the cutter bar, during the unfolding process, if the extending position of the ear stripper gap adjusting cylinder is improper, it may cause the structural members to get stuck, further resulting in internal pressure buildup in the ear stripper gap adjusting cylinder. At this time, the overflow valve opens to release the hydraulic oil in the ear stripper gap adjusting cylinder to the low-pressure oil circuit. This function can effectively prevent damage to the ear stripper gap adjusting cylinder and the structural members. When the cutter bar is folded, the two-position six-way electromagnetic directional valve is also energized by operating the electric control handle to make the working valve in the right position. At this time, when the button for the reel to move backward is pressed, the high-pressure and low-pressure oil circuits in the system are switched. Since the loads of the divider guard lifting cylinder and the hydraulic locking cylinder are smaller than that of the folding cylinder, at this time, the large chamber of the divider guard cylinder and the small chamber of the hydraulic locking cylinder are supplied with oil, first realizing the unlocking of the hydraulic locking cylinder and the lifting of the divider guard. After the above actions are completed, the flow dividing and collecting valve evenly distributes the high-pressure oil in the main oil circuit to the rear of the valve, so that the oil volumes entering the small chambers of the two folding cylinders are the same. At this time, the two folding cylinders act synchronously to realize the simultaneous folding of the cutter bars on both sides. The overflow valve integrates a check valve to prevent high-pressure oil from entering the ear stripper gap adjusting cylinder, thus ensuring that the ear stripper gap adjusting cylinder will not malfunction.

[0031] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of a hydraulic control system for a folding corn cutter bar provided by an embodiment of the present invention.

[0033] Figure 2 It is a schematic control logic diagram of a hydraulic control method for a folding corn cutter bar provided by an embodiment of the present invention.

[0034] Explanation of reference numerals in the drawings: 1. Ear stripper gap adjusting cylinder; 2. First hydraulic lock; 3. Overflow valve; 4. Folding cylinder; 5. Double balance valve; 6. Flow dividing and collecting valve; 7. Two-position six-way electromagnetic directional valve; 8. Sequence valve; 9. Divider guard lifting cylinder; 10. Second hydraulic lock; 11. Hydraulic locking cylinder; 12. Quick connector. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The illustrated embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0036] As Figure 1As shown in the figure, an embodiment of the present invention provides a hydraulic control system for a folding corn header, including: a header plate gap adjustment cylinder 1, a first hydraulic lock 2, a folding cylinder 4, a double balance valve 5, a flow dividing and collecting valve 6, an electromagnetic directional control valve, a sequence valve 8, a divider shield tilting cylinder 9, a second hydraulic lock 10, and a hydraulic locking cylinder 11. The first hydraulic lock 2, the double balance valve 5, the flow dividing and collecting valve 6, the sequence valve 8, and the second hydraulic lock 10 are respectively connected to the electromagnetic directional control valve through pipelines. The header plate gap adjustment cylinder 1 is connected to the first hydraulic lock 2 through a pipeline. The double balance valve 5 is connected to the flow dividing and collecting valve 6 through a pipeline. The folding cylinder 4 is connected to the double balance valve 5 through a pipeline. The second hydraulic lock 10 is connected to the sequence valve 8 through a pipeline. The divider shield tilting cylinder 9 and the hydraulic locking cylinder 11 are respectively connected to the second hydraulic lock 10 through pipelines.

[0037] The beneficial effects of adopting the technical solution of the present invention are as follows: The flow dividing and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to the two branches, so that the volume of the oil flowing into / out of the folding cylinder is the same, ensuring the synchronous action of the two folding cylinders. The use of a flow dividing and collecting valve + a double balance valve realizes the synchronism and stability during the unfolding / folding process of the header. The electromagnetic directional control valve is used to realize the switching between the header plate gap adjustment function and the header folding function. The sequence valve is used to realize the action sequence of the folding cylinder, the divider shield tilting cylinder, and the hydraulic locking cylinder. The sequential action of multiple functions of the folding corn header is effectively realized. The second hydraulic lock is used to maintain the states of the divider shield tilting cylinder and the hydraulic locking cylinder. The header is equipped with functions such as header folding, divider shield tilting, hydraulic locking, and header plate gap adjustment. It avoids the problem of asynchronous unfolding / folding of the header, solves the problem of jitter during the unfolding / folding process of the header, adds the hydraulic locking function after unfolding, enhances the stability during the working process of the header, and ensures the safety during the unfolding / folding process.

[0038] 1. The action logic of multiple cylinders is clear, and each function is realized in an orderly manner.

[0039] 2. The flow dividing valve (flow dividing and collecting valve 6) + double balance valve 5 ensure that the two sides of the header run synchronously and smoothly during the unfolding / folding process of the header.

[0040] 3. It realizes multiple functions and ensures that the cylinders will not malfunction and cause structural damage.

[0041] Furthermore, the large chamber of the divider shield tilting cylinder 9 is connected to the small chamber of the hydraulic locking cylinder 11 through a pipeline; the small chamber of the divider shield tilting cylinder 9 is connected to the large chamber of the hydraulic locking cylinder 11 through a pipeline.

[0042] The beneficial effects of adopting the above further technical solution are as follows: The large chamber of the divider guard lifting oil cylinder is connected to the small chamber of the hydraulic locking oil cylinder, and the second hydraulic lock is used to maintain the states of the divider guard lifting oil cylinder and the hydraulic locking oil cylinder.

[0043] Further, the number of the folding oil cylinders 4 and the double balance valves 5 is two each. The two folding oil cylinders 4 are respectively connected to the two double balance valves 5 through pipelines, and the two double balance valves 5 are respectively connected to the flow dividing and collecting valve 6 through pipelines.

[0044] The beneficial effects of adopting the above further technical solution are as follows: Each of the two folding oil cylinders is equipped with a double balance valve. The two double balance valves ensure the stability of the folding oil cylinders during the positive and negative load switching. The flow dividing and collecting valve + double balance valve are used to achieve the synchronization and stability during the unfolding / folding process of the cutter bar.

[0045] Further, the electromagnetic directional valve is a two-position six-way electromagnetic directional valve 7.

[0046] The beneficial effects of adopting the above further technical solution are as follows: The two-position six-way electromagnetic directional valve is used to realize the switching between the ear stripper gap adjustment / cutter bar folding functions.

[0047] Further, an overflow valve 3 is connected to the pipeline between the ear stripper gap adjustment oil cylinder 1 and the first hydraulic lock 2. A check valve is integrated in the overflow valve 3, and the overflow valve 3 is connected to the pipeline between the flow dividing and collecting valve 6 and the electromagnetic directional valve through a pipeline.

[0048] The beneficial effects of adopting the above further technical solution are as follows: The overflow valve is used to prevent the damage of the ear stripper gap adjustment oil cylinder and the structural parts. The check valve is integrated in the overflow valve to prevent the high-pressure oil from entering the ear stripper gap adjustment oil cylinder, so as to ensure that the ear stripper gap adjustment oil cylinder will not malfunction.

[0049] Further, the number of the ear stripper gap adjustment oil cylinders 1, the divider guard lifting oil cylinders 9 and the hydraulic locking oil cylinders 11 is two each. The two ear stripper gap adjustment oil cylinders 1 are respectively connected to the first hydraulic lock 2 through pipelines, and the two divider guard lifting oil cylinders 9 and the two hydraulic locking oil cylinders 11 are respectively connected to the second hydraulic lock 10 through pipelines.

[0050] The beneficial effects of adopting the above further technical solution are as follows: The setting of the double oil cylinders improves the stability and reliability of the system. It is convenient to adapt to the cutter bar structure.

[0051] Further, the electromagnetic directional valve is connected with a quick connector 12.

[0052] The beneficial effects of adopting the above further technical solution are as follows: The provision of the quick connector facilitates the connection between the electromagnetic directional valve and other components, and is conducive to the installation and maintenance of the system.

[0053] The hydraulic control system of the folding corn header provided by the embodiment of the present invention can be a folding header hydraulic system, which avoids the problem of asynchronous unfolding / folding of the header, solves the problem of jitter during the unfolding / folding process of the header, adds a hydraulic locking function after unfolding, enhances the stability during the working process of the header, and ensures the safety during the unfolding / folding process.

[0054] The principle of the folding corn header hydraulic system (folding corn header hydraulic control system) provided by the present invention is as Figure 1 shown. This header has functions such as header folding, divider shield tilting, hydraulic locking, and ear plate gap adjustment. In this hydraulic system (folding corn header hydraulic control system), a two-position six-way electromagnetic directional valve 7 is used to realize the switching between the ear plate gap adjustment function and the header folding function. The two-position six-way electromagnetic directional valve 7 is default in the left position. If oil is supplied at this time, the ear plate gap adjustment cylinder 1 will act.

[0055] When the header performs the folding action, the thick-line oil circuit is the high-pressure oil circuit, and the thin-line oil circuit is the low-pressure oil circuit; when the header performs the unfolding action, the thin-line oil circuit is the high-pressure oil circuit, and the thick-line oil circuit is the low-pressure oil circuit. In this folding corn header hydraulic system (folding corn header hydraulic control system), each of the two folding cylinders 4 is equipped with a double balance valve 5; the small chambers of the two folding cylinders 4 are connected to a flow dividing and collecting valve 6. The function of the flow dividing and collecting valve 6 is to evenly distribute the hydraulic oil in the main oil circuit to the two branches, so that the volume of the oil entering / flowing out of the folding cylinders 4 is the same, ensuring the synchronous action of the two folding cylinders 4. The large chamber of the divider shield tilting cylinder 9 is connected to the small chamber of the hydraulic locking cylinder 11, and a second hydraulic lock 10 is used to maintain the states of the divider shield tilting cylinder 9 and the hydraulic locking cylinder 11 (the divider shield tilting cylinder 9 maintains the extended or retracted state when the oil circuit is cut off). A sequence valve 8 is used to realize the action sequence of the folding cylinders 4, the divider shield tilting cylinder 9, and the hydraulic locking cylinder 11.

[0056] Through this hydraulic system (folding corn header hydraulic control system), the sequential actions of multiple functions of the folding corn header can be effectively realized. The two-position six-way electromagnetic directional valve 7 is used to realize function switching, and the sequence valve 8 is used to realize the action logic of the folding header. Through this hydraulic system (folding corn header hydraulic control system), the problems of jitter and non-synchronization on both sides during the unfolding and folding of the folding header can be effectively solved, the stability and safety of the folding header are enhanced, and the user experience can be effectively improved.

[0057] 1. The two-position six-way solenoid directional control valve 7 is used to realize the switching between the ear stripper gap adjustment function and the header folding function. 2. The flow dividing and collecting valve 6 + double balance valve 5 are used to realize the synchronization and stability during the header unfolding / folding process. 3. The sequence valve 8 is used to realize the logic of the multi-cylinder actions. 4. The relief valve 3 is used to ensure that the ear stripper gap adjustment cylinder 1 will not malfunction. 5. It has diverse functions.

[0058] In addition, the present invention also provides a harvester, including a hydraulic control system for a folding corn header as described in any one of the above.

[0059] The beneficial effects of adopting the technical solution of the present invention are as follows: The flow dividing and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to the two branches, so that the volume of the oil flowing into / out of the folding cylinders is the same, ensuring the synchronous action of the two folding cylinders. The flow dividing and collecting valve + double balance valve are used to realize the synchronization and stability during the header unfolding / folding process. The solenoid directional control valve is used to realize the switching between the ear stripper gap adjustment function and the header folding function. The sequence valve is used to realize the action sequence of the folding cylinder, the divider guard lifting cylinder and the hydraulic locking cylinder. The sequential actions of multiple functions of the folding corn header are effectively realized. The second hydraulic lock is used to maintain the states of the divider guard lifting cylinder and the hydraulic locking cylinder. The header is provided with functions such as header folding, divider guard lifting, hydraulic locking, and ear stripper gap adjustment. The problem of asynchronous unfolding / folding of the header is avoided, the problem of jitter during the header unfolding / folding process is solved, the hydraulic locking function after unfolding is increased, the stability during the header working process is enhanced, and the safety during the unfolding / folding process is ensured.

[0060] In addition, the present invention also provides a hydraulic control method for a folding corn header. Based on the hydraulic control system for a folding corn header as described in any one of the above, the hydraulic control method for a folding corn header includes: when the header needs to be unfolded in the folded state, control the solenoid directional control valve to be energized, so that the folding cylinders extend; under the flow dividing action of the flow dividing and collecting valve, the two folding cylinders extend synchronously, realizing the synchronous unfolding of the two sides of the header; and under the action of the double balance valve, ensure the stability of the two folding cylinders when switching between positive and negative loads; when the header is fully unfolded, the pressure starts to build up in front of the sequence valve; when the pressure reaches the opening pressure of the sequence valve, the sequence valve opens, so that the divider guard lifting cylinder contracts and the hydraulic locking cylinder extends, realizing the lowering of the divider guard and the locking of the hydraulic locking cylinder, and completing the header unfolding work.

[0061] The beneficial effects of adopting the technical solution of the present invention are as follows: When the header is unfolded, by operating the electric control handle, the two-position six-way electromagnetic reversing valve is energized. After the electromagnetic is energized, it pushes the corresponding spool to move. The working valve is in the right position. Press the reel forward button, and the large chamber of the folding cylinder is filled with oil. Since the flow dividing and collecting valve has a forced flow dividing function, the oil return volumes of the small chambers of the left and right folding cylinders are exactly the same, enabling the two sides of the header to be unfolded synchronously. Two double balance valves ensure the stability of the folding cylinder during the positive and negative load switching. When the header is completely unfolded, pressure begins to build up in front of the sequence valve. When the pressure reaches the opening pressure of the sequence valve, the sequence valve opens, and the small chamber of the divider guard lifting cylinder and the large chamber of the hydraulic locking cylinder are filled with oil. At this time, the divider guard drops, and the hydraulic locking cylinder locks. When the hydraulic locking cylinder extends, it locks the foldable part of the header. At this time, the header is completely unfolded and can be lowered to the field for harvesting operations. The flow dividing and collecting valve is used to evenly distribute the hydraulic oil in the main oil circuit to the two branches, so that the volume of the oil entering / flowing out of the folding cylinder is the same, ensuring the synchronous operation of the two folding cylinders. The use of a flow dividing and collecting valve + double balance valve realizes the synchronism and stability during the unfolding / folding process of the header. The electromagnetic reversing valve is used to realize the switching between the ear stripper gap adjustment function and the header folding function. The sequence valve is used to realize the action sequence of the folding cylinder, the divider guard lifting cylinder, and the hydraulic locking cylinder. Effectively realizing the sequential action of multiple functions of the folding corn header. The second hydraulic lock is used to maintain the states of the divider guard lifting cylinder and the hydraulic locking cylinder. The header is equipped with functions such as header folding, divider guard lifting, hydraulic locking, and ear stripper gap adjustment. It avoids the problem of asynchronous unfolding / folding of the header, solves the problem of jitter during the unfolding / folding process of the header, adds the hydraulic locking function after unfolding, enhances the stability during the working process of the header, and ensures the safety during the unfolding / folding process.

[0062] As Figure 2 shown, in the folded state of the header, 1. The valve (two-position six-way electromagnetic reversing valve 7) is energized. Long press the reel forward button, and the large chamber of the folding cylinder is filled with oil, and the header unfolds; 2. Judge whether the header is completely unfolded; 3. If so, the sequence valve 8 opens, the divider guard drops, and the locking cylinder (hydraulic locking cylinder) locks; 4. The valve (two-position six-way electromagnetic reversing valve 7) loses power, and the header is in the unfolded state; 5. Long press the reel backward button; 6. The sequence valve 8 acts, the locking cylinder (hydraulic locking cylinder) unlocks, and the divider guard lifts; 7. Continue to long press the reel backward button, and the small chamber of the folding cylinder is filled with oil, and the header folds, and the header is in the folded state.

[0063] After step 4, it includes: 41. The valve (two-position six-way electromagnetic reversing valve 7) loses power, and the header is in the unfolded state; 42. Ear stripper gap adjustment.

[0064] Further, after the header unfolding operation is completed, control the electromagnetic directional valve to lose power; adjust the header board clearance by controlling the telescopic movement of the header board clearance adjusting cylinder; when there is pressure build-up in the header board clearance adjusting cylinder, release the hydraulic oil in the header board clearance adjusting cylinder to the low-pressure oil circuit through the relief valve; when the header needs to be folded in the unfolded state, control the electromagnetic directional valve to be energized, so that the divider shield tilting cylinder extends and the hydraulic locking cylinder contracts, realizing unlocking of the hydraulic locking cylinder and tilting of the divider shield; after the unlocking of the hydraulic locking cylinder and the tilting of the divider shield are completed, under the shunting action of the flow dividing and collecting valve, the two folding cylinders contract synchronously, realizing synchronous folding of the two side headers; through the check valve integrated in the relief valve, prevent high-pressure oil from entering the header board clearance adjusting cylinder.

[0065] The beneficial effects of adopting the above further technical solution are as follows: After the unfolding is completed, the electromagnet of the two-position six-way electromagnetic directional valve loses power, and the spool moves under the action of the spring, and the two-position six-way electromagnetic directional valve returns to the left position state. At this time, if the electric control handle is manipulated and the button for the reel to move forward or the reel to move backward is pressed, the header board clearance adjusting cylinder moves to adjust the header board clearance. Since the header board clearance adjusting cylinders are placed on both sides of the header, during the unfolding process, if the extending position of the header board clearance adjusting cylinder is improper, the structural parts may be stuck, further causing pressure build-up in the header board clearance adjusting cylinder. At this time, the relief valve opens, and the hydraulic oil in the header board clearance adjusting cylinder is released to the low-pressure oil circuit. This function can effectively prevent damage to the header board clearance adjusting cylinder and the structural parts. When the header is folded, similarly, by manipulating the electric control handle, the two-position six-way electromagnetic directional valve is energized, and the working valve is in the right position. At this time, when the button for the reel to move backward is pressed, the high-pressure and low-pressure oil circuits in the system are switched. Since the load of the divider shield tilting cylinder and the hydraulic locking cylinder is smaller than that of the folding cylinder, at this time, the large chamber of the divider shield cylinder and the small chamber of the hydraulic locking cylinder are supplied with oil, first realizing unlocking of the hydraulic locking cylinder and tilting of the divider shield. After the above actions are completed, the flow dividing and collecting valve evenly distributes the high-pressure oil in the main oil circuit to the rear of the valve, so that the volume of the oil entering the small chambers of the two folding cylinders is the same. At this time, the two folding cylinders act synchronously, realizing simultaneous folding of the two side headers. The relief valve is integrated with a check valve to prevent high-pressure oil from entering the header board clearance adjusting cylinder, thus ensuring that the header board clearance adjusting cylinder will not malfunction.

[0066] The action logic of the folding header is as Figure 2 shown. When the header is unfolded, by manipulating the electric control handle, the two-position six-way electromagnetic directional valve 7 is energized. After the electromagnet is energized, it pushes the corresponding spool to move, and the working valve is in the right position. Press the button for the reel to move forward. Figure 1The thin-line oil circuit in it is the high-pressure oil circuit, which supplies oil to the large chambers of the folding cylinders 4. Since the flow dividing and collecting valve 6 has a forced flow dividing function, the oil return amounts from the small chambers of the left and right folding cylinders 4 are exactly the same, enabling the synchronous unfolding of the two side cutter bars. The two double check valves 5 ensure the stability of the cutter bar cylinders (folding cylinders 4) during the switching of positive and negative loads. When the cutter bar is fully unfolded, pressure starts to build up in front of the sequence valve 8. When the pressure reaches the opening pressure of the sequence valve 8, the sequence valve 8 opens, and the ports A1 and A2 (the ports at both ends of the sequence valve 8) are supplied with oil. The small chamber of the divider shield lifting cylinder 9 and the large chamber of the hydraulic locking cylinder 11 are supplied with oil. At this time, the divider shield drops, and the hydraulic locking cylinder 11 locks (the hydraulic locking cylinder 11 locks the foldable part of the cutter bar when it extends). At this point, the cutter bar is fully unfolded and can be lowered to the field for harvesting operations.

[0067] After the unfolding is completed, the electromagnet of the two-position six-way solenoid directional valve 7 loses power, and the spool moves under the action of the spring. The two-position six-way solenoid directional valve 7 returns to the left position. At this time, if the electric control handle is manipulated and the reel forward or reel backward button is pressed, the ear stripper gap adjusting cylinder 1 moves to adjust the ear stripper gap. Since the ear stripper gap adjusting cylinders 1 are placed on both sides of the cutter bar, during the unfolding process, if the extending position of the ear stripper gap adjusting cylinders 1 is improper, it may cause the structural parts to get stuck, further resulting in internal pressure buildup in the ear stripper gap adjusting cylinders 1. At this time, the relief valve 3 opens to release the hydraulic oil in the ear stripper gap adjusting cylinders 1 to the low-pressure oil circuit. This function can effectively prevent damage to the ear stripper gap adjusting cylinders 1 and the structural parts.

[0068] When the cutter bar is folded, the two-position six-way solenoid directional valve 7 is also energized by manipulating the electric control handle, causing the working valve to be in the right position. At this time, when the reel backward button is pressed, the high-pressure and low-pressure oil circuits in the system (the hydraulic control system of the folding corn cutter bar) are switched, and at this time the thick-line oil circuit is the high-pressure oil. Since the loads of the divider shield lifting cylinder 9 and the hydraulic locking cylinder 11 are smaller than the load of the folding cylinder 4, at this time the large chamber of the divider shield cylinder (divider shield lifting cylinder 9) and the small chamber of the hydraulic locking cylinder 11 are supplied with oil. First, the hydraulic locking cylinder 11 is unlocked and the divider shield is lifted. After the above actions are completed, the flow dividing and collecting valve 6 evenly distributes the high-pressure oil from the main oil circuit to the rear of the valve, making the oil volumes entering the small chambers of the two folding cylinders 4 the same. At this time, the two folding cylinders 4 act synchronously to achieve the simultaneous folding of the two side cutter bars. At this time, the thick-line oil circuit is the high-pressure oil circuit, and a check valve is integrated in the relief valve 3 to prevent the high-pressure oil from entering the ear stripper gap adjusting cylinder 1, thus ensuring that the ear stripper gap adjusting cylinder 1 will not malfunction.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic control system for a folding corn header, characterized in that, Comprising: The ear stripper gap adjusting oil cylinder (1), the first hydraulic lock (2), the folding oil cylinder (4), the double balance valve (5), the flow dividing and collecting valve (6), the electromagnetic directional control valve, the sequence valve (8), the divider guard lifting oil cylinder (9), the second hydraulic lock (10), and the hydraulic locking oil cylinder (11). The first hydraulic lock (2), the double balance valve (5), the flow dividing and collecting valve (6), the sequence valve (8), and the second hydraulic lock (10) are respectively connected to the electromagnetic directional control valve through pipelines. The ear stripper gap adjusting oil cylinder (1) is connected to the first hydraulic lock (2) through a pipeline. The double balance valve (5) is connected to the flow dividing and collecting valve (6) through a pipeline. The folding oil cylinder (4) is connected to the double balance valve (5) through a pipeline. The second hydraulic lock (10) is connected to the sequence valve (8) through a pipeline. The divider guard lifting oil cylinder (9) and the hydraulic locking oil cylinder (11) are respectively connected to the second hydraulic lock (10) through pipelines.

2. The hydraulic control system of a folding corn header according to claim 1, characterized in that The large chamber of the divider guard lifting oil cylinder (9) is connected to the small chamber of the hydraulic locking oil cylinder (11) through a pipeline; the small chamber of the divider guard lifting oil cylinder (9) is connected to the large chamber of the hydraulic locking oil cylinder (11) through a pipeline.

3. The hydraulic control system of a folding corn header according to claim 1, characterized in that, The number of the folding oil cylinders (4) and the double balance valves (5) is two each. The two folding oil cylinders (4) are respectively connected to the two double balance valves (5) through pipelines. The two double balance valves (5) are respectively connected to the flow dividing and collecting valve (6) through pipelines.

4. A hydraulic control system for a folding corn header according to claim 1, characterized in that The electromagnetic directional control valve is a two-position six-way electromagnetic directional control valve (7).

5. A hydraulic control system for a folding corn header according to claim 1, characterized in that, An overflow valve (3) is connected to the pipeline between the ear stripper gap adjusting oil cylinder (1) and the first hydraulic lock (2). A check valve is integrated in the overflow valve (3). The overflow valve (3) is connected to the pipeline between the flow dividing and collecting valve (6) and the electromagnetic directional control valve through a pipeline.

6. The hydraulic control system of a folding corn header according to claim 1, wherein The number of the ear stripper gap adjusting oil cylinders (1), the divider guard lifting oil cylinders (9), and the hydraulic locking oil cylinders (11) is two each. The two ear stripper gap adjusting oil cylinders (1) are both connected to the first hydraulic lock (2) through pipelines. The two divider guard lifting oil cylinders (9) and the two hydraulic locking oil cylinders (11) are respectively connected to the second hydraulic lock (10) through pipelines.

7. A hydraulic control system for a folding corn header according to claim 1, characterized in that, The electromagnetic directional control valve is connected with a quick connector (12).

8. A harvesting machine, characterized in that, Comprising a folding corn header hydraulic control system according to any one of claims 1 to 7 above.

9. A hydraulic control method for a folding corn header, characterized in that, Based on a folding corn header hydraulic control system according to any one of claims 1 to 7 above, a folding corn header hydraulic control method includes: When the header needs to be unfolded in the folded state, control the electromagnetic directional control valve to be energized so that the folding oil cylinder extends; Under the flow dividing action of the flow dividing and collecting valve, the two folding oil cylinders extend synchronously to realize the synchronous unfolding of the two sides of the header; and under the action of the double balance valve, ensure the stability of the two folding oil cylinders during the positive and negative load switching; When the header is fully unfolded, pressure starts to build up in front of the sequence valve; When the pressure reaches the opening pressure of the sequence valve, the sequence valve opens, causing the lifter cylinder of the divider shield to contract and the hydraulic locking cylinder to extend, realizing the lowering of the divider shield and the locking of the hydraulic locking cylinder, and completing the operation of unfolding the cutting table.

10. A hydraulic control method for a folding corn header according to claim 9, characterized in that, After the operation of unfolding the cutting table is completed, control the solenoid directional valve to lose power; Adjust the gap of the picker plates by controlling the telescopic movement of the picker plate gap adjustment cylinder; When the picker plate gap adjustment cylinder is under pressure, release the hydraulic oil in the picker plate gap adjustment cylinder to the low-pressure oil circuit through the relief valve; When the cutting table needs to be folded in the unfolded state, control the solenoid directional valve to be energized, causing the lifter cylinder of the divider shield to extend and the hydraulic locking cylinder to contract, realizing the unlocking of the hydraulic locking cylinder and the lifting of the divider shield; After the operations of unlocking the hydraulic locking cylinder and lifting the divider shield are completed, under the shunting effect of the flow dividing and collecting valve, the two folding cylinders contract synchronously to realize the synchronous folding of the cutting tables on both sides; Prevent high-pressure oil from entering the picker plate gap adjustment cylinder through the check valve integrated in the relief valve.

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