Hydraulic control system of folding corn header and harvester

Abstract

The utility model provides a hydraulic control system of 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 utility model relates to the technical field of hydraulic control of harvesting machine header, especially to a folding corn header hydraulic control system and a harvesting machine. BACKGROUND

[0002] The folding corn header is mainly applied to the agricultural machinery field in developed countries, and the hydraulic control system is the key technology for realizing the folding / unfolding of the folding corn header and the gap adjustment of the earing plate. At present, the common large corn header that cannot be folded is widely used in China. In response to the limitations of the traditional header, the folding corn header has become an important research direction in recent years. Through the foldable design, the length of the machine body under transportation and non-operation state is greatly reduced, the mobility and storage convenience of the machine are improved, and it is especially suitable for small plots or hilly areas. At present, developed countries have popularized the folding header technology on combine harvesters to realize "one machine for multiple purposes" and reduce the cost of farmers. Domestic related research focuses on structure optimization and reliability improvement, but the overall still faces challenges such as insufficient technology maturity and the stability of the hydraulic system needs to be strengthened.

[0003] At present, the folding corn header hydraulic system of foreign manufacturers has fewer functions. The common folding corn header hydraulic system has single hydraulic function, only has the side auger rotation and header folding function, the header folding cylinder integrates a hydraulic lock, which is used to ensure the stability of the header during the switching of positive and negative loads in the header folding process, but the hydraulic lock performs poorly, with slight shaking during the header folding process. The lifting of the divider guard is realized by mechanical structure only, and there is a risk of damage to mechanical components due to the falling of the guard during transportation. Due to the weight difference between the left and right sides of this header, the two sides of the header are not synchronized during the unfolding and folding process.

[0004] The folding header hydraulic system of another foreign manufacturer uses hydraulic cylinders to drive the header folding function and the divider guard lifting function. A double-head balance valve is used to ensure the stability of the header unfolding and folding, and a sequence valve is used to realize the divider guard lifting function.

[0005] The current folding header hydraulic system technology has the following shortcomings:

[0006] 1. Using a hydraulic lock or two oil cylinders sharing a balance valve causes shaking during the header unfolding / folding process.

[0007] 2. The two sides of the header are not synchronized during the unfolding / folding process, with one side folding faster than the other side or one side folding first and the other side folding later.

[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 adjust in time and change the direction of action, it will cause the header to fall too fast or even drop by its own weight, which poses a great safety hazard.

[0009] 4. Hydraulic systems achieve less functionality. Invention content

[0010] The utility model solves the technical problem that the prior art is insufficient, provides a kind of folding corn header hydraulic control system and harvester.

[0011] The utility model solves the technical problem as follows: a kind of folding corn header hydraulic control system, comprising: earing plate gap adjustment oil cylinder, first hydraulic lock, folding oil cylinder, double balanced valve, shunt collector valve, electromagnetic reversing valve, sequence valve, straw guard shield tilting oil cylinder, second hydraulic lock and hydraulic lock cylinder, the first hydraulic lock, the double balanced valve, the shunt collector valve, the sequence valve and the second hydraulic lock are connected with the electromagnetic reversing valve respectively by pipeline, the earing plate gap adjustment oil cylinder is connected with the first hydraulic lock by pipeline, the double balanced valve is connected with the shunt collector valve by pipeline, the folding oil cylinder is connected with the double balanced valve by pipeline, the second hydraulic lock is connected with the sequence valve by pipeline, the straw guard shield tilting oil cylinder and the hydraulic lock cylinder are connected with the second hydraulic lock by pipeline respectively.

[0012] The beneficial effects of the technical scheme of the utility model are: shunt collector valve is used to distribute the hydraulic oil of main oil way to two branches evenly, so that the oil volume of folding oil cylinder is the same, and the synchronous action of two folding oil cylinders is guaranteed. The use of shunt collector valve+double balanced valve realizes the synchronism and stability in the process of header unfolding / folding. Electromagnetic reversing valve is used to realize the switching of earing plate gap adjustment function and header folding function. The use of sequence valve realizes the action sequence of folding oil cylinder, straw guard shield tilting oil cylinder and hydraulic lock cylinder. Effectively realize the sequential action of multiple functions of folding corn header. The use of second hydraulic lock maintains the state of straw guard shield tilting oil cylinder and hydraulic lock cylinder. So that the header has the functions of header folding, straw guard shield tilting, hydraulic locking, earing plate gap adjustment. Avoid the problem of different step of header unfolding / folding, solve the problem of shaking in the process of header unfolding / folding, increase the hydraulic locking function after unfolding, enhance the stability in the process of header working, guarantee the safety in the process of unfolding / folding.

[0013] Further, the large cavity of the straw guard shield tilting oil cylinder is connected with the small cavity of the hydraulic lock cylinder by pipeline; the small cavity of the straw guard shield tilting oil cylinder is connected with the large cavity of the hydraulic lock cylinder by pipeline.

[0014] The beneficial effects of the above further technical scheme are: the large cavity of the straw guard shield tilting oil cylinder is connected with the small cavity of the hydraulic lock cylinder, and the second hydraulic lock is used to maintain the state of the straw guard shield tilting oil cylinder and the hydraulic lock cylinder.

[0015] Furthermore, there are two folding cylinders and two dual balance valves. The two folding cylinders are connected to the two dual balance valves through pipelines, and the two dual balance valves are connected to the flow divider and combiner valves through pipelines.

[0016] The beneficial effects of adopting the above-mentioned further technical solution are: each of the two folding cylinders is equipped with a double balance valve. The two double balance valves ensure the stability of the folding cylinders when switching between positive and negative loads. The use of a flow divider / combiner valve + double balance valves achieves synchronization and stability during the unfolding / folding process of the cutting platform.

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

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that the switching between the ear-picking plate gap adjustment and the header folding function is realized by using a two-position six-way solenoid directional valve.

[0019] Furthermore, an overflow valve is connected to the pipeline between the ear-picking plate gap adjusting cylinder and the first hydraulic lock. The overflow valve integrates a one-way valve, and the overflow valve is connected to the pipeline between the diverting and combining valve and the solenoid directional valve through a pipeline.

[0020] The beneficial effects of adopting the above-mentioned further technical solution are: the overflow valve is used to prevent damage to the picking plate gap adjusting cylinder and structural components. The overflow valve integrates a check valve to prevent high-pressure oil from entering the picking plate gap adjusting cylinder, thereby ensuring that the picking plate gap adjusting cylinder will not malfunction.

[0021] Furthermore, there are two of each of the ear-picking plate gap adjustment cylinder, the divider cover tilting cylinder, and the hydraulic locking cylinder. Both ear-picking plate gap adjustment cylinders are connected to the first hydraulic lock via pipelines, and the two divider cover tilting cylinders and the two hydraulic locking cylinders are respectively connected to the second hydraulic lock via pipelines.

[0022] The beneficial effects of adopting the above-mentioned further technical solution are: the dual-cylinder configuration improves the stability and reliability of the system, and facilitates adaptation to the cutter head structure.

[0023] Furthermore, the electromagnetic directional valve is connected to a quick-connect coupling.

[0024] The beneficial effects of adopting the above-mentioned further technical solutions are: the quick coupling facilitates the connection of the electromagnetic directional valve with other components, and facilitates the installation and maintenance of the system.

[0025] In addition, this utility model also provides a harvester, including a hydraulic control system for a folding corn header as described in any one of the above.

[0026] The beneficial effects of the technical scheme of the utility model are: the shunt and collecting valve is used for evenly distributing the hydraulic oil of the main oil path to two branches, so that the oil volume of the folding oil cylinder entering / flowing out is the same, and the synchronous action of the two folding oil cylinders is ensured. The shunt and collecting valve + double balance valve are used to realize the synchronism and stability in the unrolling / folding process of the header. The electromagnetic reversing valve is used to realize the switching of the gap adjustment function of the ear head plate and the folding function of the header. The sequence valve is used to realize the action sequence of the folding oil cylinder, the divider guard lifting 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 state of the divider guard lifting oil cylinder and the hydraulic locking oil cylinder. The header has the functions of header folding, divider guard lifting, hydraulic locking and ear head plate gap adjustment. The problem of asynchronous unrolling / folding of the header is avoided, the problem of shaking in the unrolling / folding process of the header is solved, the hydraulic locking function after unrolling is increased, the stability in the working process of the header is enhanced, and the safety in the unrolling / folding process is ensured.

[0027] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure schematic view of the folding corn header hydraulic control system provided by the utility model embodiment is shown.

[0029] Figure 2 The control logic schematic view of the folding corn header hydraulic control method provided by the utility model embodiment is shown.

[0030] Explanation of reference numerals: 1, ear head plate gap adjustment oil cylinder; 2, first hydraulic lock; 3, overflow valve; 4, folding oil cylinder; 5, double balance valve; 6, shunt and collecting valve; 7, two-position six-way electromagnetic reversing valve; 8, sequence valve; 9, divider guard lifting oil cylinder; 10, second hydraulic lock; 11, hydraulic locking oil cylinder; 12, quick connector. DETAILED DESCRIPTION

[0031] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model, and are not used to limit the scope of the utility model.

[0032] As Figure 1The utility model discloses a folding corn header hydraulic control system, including: earing plate gap adjusting oil cylinder 1, first hydraulic lock 2, folding oil cylinder 4, double balance valve 5, shunt valve 6, electromagnetic reversing valve, sequence valve 8, grain divider guard cocking oil cylinder 9, second hydraulic lock 10 and hydraulic lock oil cylinder 11, first hydraulic lock 2, double balance valve 5, shunt valve 6, sequence valve 8 and second hydraulic lock 10 are connected with electromagnetic reversing valve respectively through pipeline, earing plate gap adjusting oil cylinder 1 is connected with first hydraulic lock 2 through pipeline, double balance valve 5 is connected with shunt valve 6 through pipeline, folding oil cylinder 4 is connected with double balance valve 5 through pipeline, second hydraulic lock 10 is connected with sequence valve 8 through pipeline, grain divider guard cocking oil cylinder 9 and hydraulic lock oil cylinder 11 are connected with second hydraulic lock 10 respectively through pipeline.

[0033] The beneficial effects of the technical scheme of the utility model are as follows: the shunt valve is used to evenly distribute the hydraulic oil of the main oil way to two branches, so that the oil volume of the folding oil cylinder is the same when entering / flowing out, and the synchronous action of the two folding oil cylinders is ensured. The shunt valve + double balance valve are used to realize the synchronism and stability during the unfolding / folding process of the header. The electromagnetic reversing valve is used to realize the switching of the earing plate gap adjusting function and the header folding function. The sequence valve is used to realize the action sequence of the folding oil cylinder, the grain divider guard cocking oil cylinder and the hydraulic lock oil cylinder. The sequence action of multiple functions of the folding corn header is effectively realized. The second hydraulic lock is used to maintain the state of the grain divider guard cocking oil cylinder and the hydraulic lock oil cylinder. The header has the functions of header folding, grain divider guard cocking, hydraulic locking and earing plate gap adjusting. The problem of asynchronization during the unfolding / folding of the header is avoided, the problem of shaking 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.

[0034] 1. The action logic of multiple oil cylinders is clear, and each function is realized in order.

[0035] 2. The shunt valve (shunt valve 6) + double balance valve 5 ensure that the two headers run synchronously and stably during the unfolding / folding process of the header.

[0036] 3. Multiple functions are realized, and the oil cylinder will not be misoperated to cause structural damage.

[0037] Further, the large cavity of the grain divider guard cocking oil cylinder 9 is connected with the small cavity of the hydraulic lock oil cylinder 11 through a pipeline; and the small cavity of the grain divider guard cocking oil cylinder 9 is connected with the large cavity of the hydraulic lock oil cylinder 11 through a pipeline.

[0038] The beneficial effect of the further technical scheme is that the large cavity of the divider guard tilting oil cylinder is connected with the small cavity of the hydraulic locking oil cylinder, and the second hydraulic lock is used to maintain the state of the divider guard tilting oil cylinder and the hydraulic locking oil cylinder.

[0039] Further, the number of the folding oil cylinders 4 and the double balance valves 5 is two, the two folding oil cylinders 4 are connected with the two double balance valves 5 through pipelines respectively, and the two double balance valves 5 are connected with the flow divider and collector valve 6 through pipelines respectively.

[0040] The beneficial effect of the further technical scheme is that one double balance valve is arranged on each of the two folding oil cylinders. The two double balance valves ensure the stability of the folding oil cylinders when switching between positive and negative loads. The flow divider and collector valve + double balance valve are used to realize the synchronization and stability in the process of the header unfolding / folding.

[0041] Further, the electromagnetic reversing valve is a two-position six-way electromagnetic reversing valve 7.

[0042] The beneficial effect of the further technical scheme is that the two-position six-way electromagnetic reversing valve is used to realize the switching of the header gap adjustment / header folding function.

[0043] Further, an overflow valve 3 is connected between the header gap adjustment oil cylinder 1 and the first hydraulic lock 2, a one-way valve is integrated in the overflow valve 3, and the overflow valve 3 is connected with the pipeline between the flow divider and collector valve 6 and the electromagnetic reversing valve through a pipeline.

[0044] The beneficial effect of the further technical scheme is that the overflow valve is used to prevent the header gap adjustment oil cylinder and structural parts from being damaged. The one-way valve integrated in the overflow valve prevents high-pressure oil from entering the header gap adjustment oil cylinder, so that the header gap adjustment oil cylinder will not be misoperated.

[0045] Further, the number of the header gap adjustment oil cylinder 1, the divider guard tilting oil cylinder 9 and the hydraulic locking oil cylinder 11 is two, the two header gap adjustment oil cylinders 1 are connected with the first hydraulic lock 2 through pipelines respectively, and the two divider guard tilting oil cylinders 9 and the two hydraulic locking oil cylinders 11 are connected with the second hydraulic lock 10 through pipelines respectively.

[0046] The beneficial effect of the further technical scheme is that the double oil cylinders are arranged to improve the stability and reliability of the system. It is convenient to adapt to the structure of the header.

[0047] Further, the electromagnetic reversing valve is connected with a quick connector 12.

[0048] The beneficial effects of the further technical scheme are that the quick connector is arranged, the electromagnetic directional control valve is convenient to connect with other components, and the system is convenient to install and maintain.

[0049] The folding corn header hydraulic control system provided by the embodiment of the utility model can be a folding header hydraulic system, avoids the problem of asynchronization of header unfolding / folding, solves the problem of shaking during the header unfolding / folding process, increases the hydraulic locking function after unfolding, enhances the stability during the header working process, and guarantees the safety during the unfolding / folding process.

[0050] The folding corn header hydraulic system (folding corn header hydraulic control system) provided by the utility model has the principle as shown in the figure Figure 1 The header has the functions of header folding, divider guard lifting, hydraulic locking and ear picking plate gap adjustment.

[0051] When the header performs the folding action, the thick line oil way is a high pressure oil way, and the thin line oil way is a low pressure oil way; when the header performs the unfolding action, the thin line oil way is a high pressure oil way, and the thick line oil way is a low pressure oil way. The divider guard lifting oil cylinder 9 is connected with the hydraulic locking oil cylinder 11, and the second hydraulic lock 10 is used to maintain the state of the divider guard lifting oil cylinder 9 and the hydraulic locking oil cylinder 11 (when the oil way is cut off, the divider guard lifting oil cylinder 9 is maintained in the extended or retracted state).

[0052] Through the hydraulic system (folding corn header hydraulic control system), the sequential action of multiple functions of the folding corn header can be effectively realized, the two-way six-way electromagnetic directional control valve 7 is used to realize the function switching, and the sequence valve 8 is used to realize the action logic of the folding header.

[0053] 1. The switching of the head clearance adjustment / folding function of the header is realized by using a two-position six-way electromagnetic reversing valve 7.2. The synchronization and stability during the unfolding / folding process of the header are realized by using a flow dividing and collecting valve 6+double balance valve 5.3. The logic of the multi-cylinder action is realized by using a sequence valve 8.4. The malfunction of the head clearance adjustment cylinder 1 is prevented by using a relief valve 3.5. The functions are various.

[0054] In addition, the utility model still provides a kind of harvesting machine, including the hydraulic control system of folding corn header of any one described above.

[0055] The beneficial effects of the technical scheme of the utility model are as follows: the flow dividing and collecting valve is used to evenly distribute the hydraulic oil of the main oil way to two branches, so that the oil volume of the folding cylinder entering / flowing out is the same, and the synchronous action of the two folding cylinders is ensured.The synchronization and stability during the unfolding / folding process of the header are realized by using a flow dividing and collecting valve+double balance valve. The electromagnetic reversing valve is used to realize the switching of the head clearance adjustment function and the folding function of the header. The action sequence of the folding cylinder, the divider shield lifting cylinder and the hydraulic locking cylinder is realized by using the sequence valve. The sequential action of multiple functions of the folding corn header is effectively realized. The state of the divider shield lifting cylinder and the hydraulic locking cylinder is maintained by using the second hydraulic lock. The header is provided with the functions of header folding, divider shield lifting, hydraulic locking and head clearance adjustment. The problem of different synchronization of header unfolding / folding is avoided, the problem of shaking 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.

[0056] In addition, the utility model further provides a kind of folding corn header hydraulic control method based on the folding corn header hydraulic control system of any one described above, and the folding corn header hydraulic control method includes: when the header needs to be unfolded in the folded state, the electromagnetic reversing valve is powered on to make the folding cylinder extend out;Under the flow dividing effect of the flow dividing and collecting valve, the two folding cylinders extend out synchronously, and the synchronous unfolding of the two sides of the header is realized;And under the action of the double balance valve, the stability of the two folding cylinders when switching positive and negative load is ensured;When the header is completely unfolded, the pressure before the sequence valve is established;When the pressure reaches the opening pressure of the sequence valve, the sequence valve is opened, so that the divider shield lifting cylinder is retracted and the hydraulic locking cylinder is extended out, the divider shield is lowered and the hydraulic locking cylinder is locked, and the header unfolding work is completed.

[0057] The beneficial effects of this utility model's technical solution are as follows: When the header is unfolded, the two-position six-way solenoid directional valve is energized by operating the electric control handle. After the solenoid is energized, it pushes the corresponding valve core to move, and the working valve is in the right position. Pressing the reel forward button allows oil to enter the large chamber of the folding cylinder. Due to the forced diversion function of the flow divider valve, the oil return volume of the small chambers of the left and right folding cylinders is exactly the same, allowing the headers on both sides to unfold synchronously. Two double balance valves ensure the stability of the folding cylinders when switching between positive and negative loads. When the header 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 oil enters the small chamber of the divider cover lifting cylinder and the large chamber of the hydraulic locking cylinder. At this time, the divider cover falls, 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 fully unfolded and can be used for harvesting. The flow divider valve evenly distributes the hydraulic oil from the main circuit to the two branches, ensuring that the oil volume entering and exiting the folding cylinders is the same, thus guaranteeing synchronous operation of the two folding cylinders. The flow divider valve combined with a double balance valve achieves synchronization and stability during the header unfolding / folding process. The solenoid directional valve switches between the ear-picking plate gap adjustment function and the header folding function. A sequence valve sequentially controls the actions of the folding cylinder, the divider cover lifting cylinder, and the hydraulic locking cylinder, effectively enabling the sequential operation of multiple functions of the folding corn header. A second hydraulic lock maintains the state of the divider cover lifting cylinder and the hydraulic locking cylinder. This allows the header to perform header folding, divider cover lifting, hydraulic locking, and ear-picking plate gap adjustment functions. This avoids the problem of asynchronous header unfolding / folding, solves the problem of vibration during unfolding / folding, adds a hydraulic locking function after unfolding, enhances the stability of the header during operation, and ensures safety during unfolding / folding.

[0058] like Figure 2 As shown, in the folded state of the header: 1. The valve (2-position 6-way solenoid directional valve 7) is energized. Press and hold the forward button of the reel, and oil enters the large chamber of the folding cylinder, unfolding the header; 2. Determine if the header is fully unfolded; 3. If so, the sequence valve 8 opens, the divider cover falls, and the locking cylinder (hydraulic locking cylinder) closes; 4. The valve (2-position 6-way solenoid directional valve 7) is de-energized, and the header is in the unfolded state; 5. Press and hold the reel backward button; 6. The sequence valve 8 activates, the locking cylinder (hydraulic locking cylinder) unlocks, and the divider cover tilts up; 7. Continue to press and hold the reel backward button, and oil enters the small chamber of the folding cylinder, folding the header, returning it to the folded state.

[0059] Step 4 is followed by: 41. The valve (two-position six-way solenoid directional valve 7) is de-energized, and the cutting platform is in the unfolded state; 42. The gap of the picking plate is adjusted.

[0060] Further, after the cutting platform is unfolded, the electromagnetic reversing valve is controlled to lose power; the extension and retraction of the oil cylinder is adjusted by controlling the gap adjustment of the snapping plate, the gap of the snapping plate is adjusted; when the gap adjustment oil cylinder of the snapping plate is pressurized, the hydraulic oil in the gap adjustment oil cylinder of the snapping plate is released to the low-pressure oil circuit through the overflow valve; when the cutting platform needs to be folded in the unfolded state, the electromagnetic reversing valve is controlled to be powered on, so that the folding oil cylinder is retracted and the hydraulic locking oil cylinder is extended, the hydraulic locking oil cylinder is unlocked and the guard shield of the divider is raised; after the unlocking of the hydraulic locking oil cylinder and the raising of the guard shield of the divider are completed, under the shunting effect of the shunt and collector valve, the two folding oil cylinders are synchronously retracted, and the two cutting platforms are synchronously folded; the one-way valve integrated in the overflow valve prevents high-pressure oil from entering the gap adjustment oil cylinder of the snapping plate.

[0061] The beneficial effects of the above further technical solutions are: after unfolding, the electromagnet of the two-position six-way electromagnetic reversing valve loses power, the valve core moves under the action of the spring, the two-position six-way electromagnetic reversing valve returns to the left position, at this time, if the electric control handle is operated, the forward or backward button of the sweeping reel is pressed, the gap adjustment oil cylinder of the snapping plate moves, and the gap of the snapping plate is adjusted. Since the gap adjustment oil cylinder of the snapping plate is placed on both sides of the cutting platform, if the extension position of the gap adjustment oil cylinder of the snapping plate is improper during unfolding, the structure will be stuck, and the gap adjustment oil cylinder of the snapping plate will be pressurized, at this time, the overflow valve is opened, the hydraulic oil in the gap adjustment oil cylinder of the snapping plate is released to the low-pressure oil circuit, and this function can effectively prevent the gap adjustment oil cylinder of the snapping plate and the structure from being damaged. When the cutting platform is folded, the two-position six-way electromagnetic reversing valve is powered on by operating the electric control handle, so that the working valve is in the right position. At this time, the backward button of the sweeping reel is pressed, and the high and low pressure oil circuits in the system are switched. Since the load of the guard shield cylinder of the divider and the load of the hydraulic locking oil cylinder are smaller than the load of the folding oil cylinder, the large cavity of the guard shield cylinder of the divider and the small cavity of the hydraulic locking oil cylinder are filled with oil at this time, the hydraulic locking oil cylinder is unlocked and the guard shield of the divider is raised, after the above actions are completed, the shunt and collector valve divides the high-pressure oil of the main oil circuit, so that the oil volume entering the small cavities of the two folding oil cylinders is the same, at this time, the two folding oil cylinders are synchronously operated, and the two cutting platforms are simultaneously folded. The one-way valve integrated in the overflow valve prevents high-pressure oil from entering the gap adjustment oil cylinder of the snapping plate, so as to ensure that the gap adjustment oil cylinder of the snapping plate will not be misoperated.

[0062] The action logic of the folding cutting platform is as shown in Figure 2 When the cutting platform is unfolded, the two-position six-way electromagnetic reversing valve 7 is powered on by operating the electric control handle, the corresponding valve core is pushed to move after the electromagnetic is powered on, the working valve is in the right position, the forward button of the sweeping reel is pressed, Figure 1The thin line oil path in the figure is a high pressure oil path, which makes the big cavity of the folding oil cylinder 4 enter oil. Since the flow dividing and collecting valve 6 has a forced flow dividing function, the left and right folding oil cylinder 4 small cavities return oil in the same amount, so that the two sides of the header are synchronized to unfold. The two double balance valves 5 ensure the stability of the header oil cylinder (folding oil cylinder 4) when switching between positive and negative loads. When the header is completely unfolded, the valve before the sequence valve 8 starts to establish pressure. When the pressure reaches the opening pressure of the sequence valve 8, the sequence valve 8 opens, A1 and A2 (the ports at both ends of the sequence valve 8) are connected to oil, the small cavity of the divider shield lifting cylinder 9 and the big cavity of the hydraulic locking cylinder 11 enter oil. At this time, the divider shield falls, and the hydraulic locking cylinder 11 is locked (when the hydraulic locking cylinder 11 is extended, the foldable part of the header is locked). At this time, the header is completely unfolded, and the harvesting operation can be carried out on the ground.

[0063] After unfolding, the electromagnet of the two-position six-way electromagnetic reversing valve 7 loses power, and the spool moves under the action of the spring. The two-position six-way electromagnetic reversing valve 7 returns to the left position. At this time, if the electric control handle is operated, the forward or backward button of the swather is pressed, the ear plate gap adjusting oil cylinder 1 moves, and the ear plate gap is adjusted. Since the ear plate gap adjusting oil cylinder 1 is placed on both sides of the header, if the position of the ear plate gap adjusting oil cylinder 1 is not appropriate during unfolding, the structure will be jammed, which will further cause the ear plate gap adjusting oil cylinder 1 to be pressurized. At this time, the overflow valve 3 opens, and the hydraulic oil in the ear plate gap adjusting oil cylinder 1 is released to the low pressure oil path. This function can effectively prevent the ear plate gap adjusting oil cylinder 1 and the structure from being damaged.

[0064] When the header is folded, the two-position six-way electromagnetic reversing valve 7 is energized by operating the electric control handle, so that the working valve is in the right position. At this time, the backward button of the swather is pressed, and the high and low pressure oil paths in the system (the hydraulic control system of the folding corn header) are switched. At this time, the thick line oil path is high pressure oil. Since the load of the divider shield lifting cylinder 9 and the hydraulic locking cylinder 11 is smaller than that of the folding oil cylinder 4, the big cavity of the divider shield cylinder (divider shield lifting cylinder 9) and the small cavity of the hydraulic locking cylinder 11 enter oil, first realizing the unlocking of the hydraulic locking cylinder 11 and the lifting of the divider shield. After the above actions are completed, the flow dividing and collecting valve 6 divides the high pressure oil of the main oil path to the rear of the valve, so that the oil volume entering the small cavities of the two folding oil cylinders 4 is the same. At this time, the two folding oil cylinders 4 act synchronously, realizing the simultaneous folding of the two sides of the header. At this time, the thick line oil path is a high pressure oil path, and the overflow valve 3 integrates a check valve to prevent high pressure oil from entering the ear plate gap adjusting oil cylinder 1, so as to ensure that the ear plate gap adjusting oil cylinder 1 will not be misoperated.

[0065] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic control system for a folding corn header, comprising: It comprises a head cutting plate gap adjusting oil cylinder (1), a first hydraulic lock (2), a folding oil cylinder (4), a double balance valve (5), a flow distribution and collection valve (6), an electromagnetic reversing valve, a sequence valve (8), a divider guard lifting oil cylinder (9), a second hydraulic lock (10) and a hydraulic locking oil cylinder (11), the first hydraulic lock (2), the double balance valve (5), the flow distribution and collection valve (6), the sequence valve (8) and the second hydraulic lock (10) are connected with the electromagnetic reversing valve through pipelines respectively, the head cutting plate gap adjusting oil cylinder (1) is connected with the first hydraulic lock (2) through a pipeline, the double balance valve (5) is connected with the flow distribution and collection valve (6) through a pipeline, the folding oil cylinder (4) is connected with the double balance valve (5) through a pipeline, the second hydraulic lock (10) is connected with the sequence valve (8) through a pipeline, the divider guard lifting oil cylinder (9) and the hydraulic locking oil cylinder (11) are connected with the second hydraulic lock (10) through pipelines respectively. The large cavity of the divider guard lifting oil cylinder (9) is connected with the small cavity of the hydraulic locking oil cylinder (11) through a pipeline; the small cavity of the divider guard lifting oil cylinder (9) is connected with the large cavity of the hydraulic locking oil cylinder (11) through a pipeline.

2. The hydraulic control system for a folding corn head according to claim 1, wherein, The number of the folding oil cylinder (4) and the double balance valve (5) is two, two folding oil cylinders (4) are connected with two double balance valves (5) through pipelines respectively, and two double balance valves (5) are connected with the flow distribution and collection valve (6) through pipelines respectively.

3. The hydraulic control system for a folding corn head according to claim 1, wherein, The electromagnetic reversing valve is a two-position six-way electromagnetic reversing valve (7).

4. The hydraulic control system for a folding corn head according to claim 1, wherein, An overflow valve (3) is connected between the pipeline between the head cutting plate gap adjusting oil cylinder (1) and the first hydraulic lock (2), a one-way valve is integrated in the overflow valve (3), and the overflow valve (3) is connected with the pipeline between the flow distribution and collection valve (6) and the electromagnetic reversing valve through a pipeline.

5. The hydraulic control system for a folding corn head according to claim 1, wherein, The number of the head cutting plate gap adjusting oil cylinder (1), the divider guard lifting oil cylinder (9) and the hydraulic locking oil cylinder (11) is two, two head cutting plate gap adjusting oil cylinders (1) are connected with the first hydraulic lock (2) through pipelines respectively, and two divider guard lifting oil cylinders (9) and two hydraulic locking oil cylinders (11) are connected with the second hydraulic lock (10) through pipelines respectively.

6. The hydraulic control system for a folding corn head according to claim 1, wherein, The electromagnetic reversing valve is connected with a quick connector (12).

7. The hydraulic control system for a folding corn head according to claim 1, wherein, The folding corn header hydraulic control system comprises the folding corn header hydraulic control system according to any one of claims 1 to 7.

8. A harvester characterized by ​

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