Hydraulic drive system and drive method for reverse rotation of header of corn harvester

Abstract

The invention relates to the technical field of corn harvester equipment, and provides a hydraulic drive system and a hydraulic drive method for reverse rotation of a header of a corn harvester. The system comprises a hydraulic power unit, a control valve group, an execution element and a header reversing device. The hydraulic power unit provides a hydraulic oil source, the control valve set controls the flow direction, the execution element comprises a reversing oil cylinder and a motor, and the header reversing device is installed on the header. The control valve group is powered on, and hydraulic oil drives the reversing oil cylinder and the motor to achieve reversing of the header. According to the method, by starting a hydraulic power unit and triggering a reverse rotation instruction, an electric control reverse rotation control valve is powered on for reversing, hydraulic oil pushes a cylinder rod to stretch out, a reverse rotation gear is driven to be meshed with a header main input shaft gear, reverse rotation is driven, and resetting is conducted after completion. The system is simple in arrangement, high in integration level, convenient to operate, high in safety, high in reliability, easy to maintain, low in cost and good in universality, and the overall performance of the system is superior to that of the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corn harvester equipment, in particular to a corn harvester header reverse hydraulic driving system and driving method. BACKGROUND

[0002] The driving mode of corn harvester header mainly includes mechanical driving and hydraulic driving. The mechanical driving mode is widely used in traditional models due to its simple structure, low cost and high modularization. However, in order to realize the reverse function of the header, additional mechanical structures such as transmission box, chain wheel, chain and tensioning wheel need to be added, for example, the scheme disclosed in CN205961873U, that is, the transmission direction is changed by adding a reversing device and a belt tensioning wheel. Such mechanical reversing structure not only has complex arrangement and large space occupation, but also needs to rely on the pull line operation, and the driver needs to frequently get on and off the vehicle, which is low in efficiency and inconvenient to operate. In addition, the transmission box has the problems of poor heat dissipation and difficult maintenance, and the multi-belt structure is easy to wear and has a short service life.

[0003] On the other hand, although the hydraulic driving can conveniently realize the reversing function and simplify the mechanical transmission parts, it usually needs to build an independent closed or open hydraulic system, which leads to the need to re-match the whole machine hydraulic system, and the hydraulic pump, radiator and oil tank need to be adjusted accordingly, resulting in complex system, significant cost increase and great influence on the hydraulic performance of the whole machine. Therefore, there is still a lack of a solution in the prior art that can conveniently realize the reverse function without increasing the cost and complexity of the system.

[0004] In view of the above problems, the present application provides a corn harvester header reverse hydraulic driving system, which aims to overcome the defects of the existing mechanical reversing structure, such as inconvenient operation and complex maintenance, as well as the high cost and difficulty of integration of the hydraulic reversing system. SUMMARY

[0005] In order to overcome the above technical defects, the present application provides a corn harvester header reverse hydraulic driving system, which comprises:

[0006] A hydraulic power unit for providing a hydraulic oil source;

[0007] A control valve group connected with the hydraulic power unit for controlling the flow direction of hydraulic oil;

[0008] An execution element including a reverse cylinder and a reverse motor, the reverse cylinder being connected with the control valve group and driving the mechanical transmission part to act according to the hydraulic signal, and the reverse motor being connected with the reverse cylinder oil circuit and being driven to rotate by the hydraulic oil after the reverse cylinder acts;

[0009] The cutting platform reversing device is installed on the cutting platform and comprises a reversing swing arm driven by the reversing cylinder, a reversing gear connected with the output end of the reversing motor and a cutting platform main input shaft gear, the reversing swing arm can engage or disengage the reversing gear with the cutting platform main input shaft gear under the driving of the reversing cylinder.

[0010] When the control valve group is powered, the hydraulic oil drives the reversing cylinder and the reversing motor in turn, and then the cutting platform reversing device is used to realize the reversing of the cutting platform.

[0011] As preferred in the present application, the hydraulic power unit comprises:

[0012] An engine is installed on the vehicle frame;

[0013] A traveling pump is installed on the engine and its input end is connected to the output end of the engine;

[0014] A gear pump is installed on the traveling pump and its input end is connected to the output end of the engine, and its inlet is connected to the hydraulic oil tank on the frame through a gear pump oil suction pipe;

[0015] A flow divider is connected to the outlet of the gear pump through a flow divider oil supply pipe, and its outlet is connected to the hydraulic oil tank through a flow divider oil drain pipe

[0016] As preferred in the present application, the control valve group is an electrically controlled reversing control valve, its inlet is connected to the outlet of the gear pump through a reversing control valve oil supply pipe, its first outlet is connected to the reversing cylinder through a cylinder oil supply pipe, and its second outlet is connected to the hydraulic oil tank through a reversing control valve oil drain pipe.

[0017] As preferred in the present application, in the execution element:

[0018] The inlet of the reversing motor is connected to the outlet of the reversing cylinder through a motor oil supply pipe, and its outlet is connected to the reversing control valve through a motor oil drain pipe.

[0019] As preferred in the present application, the reversing cylinder comprises a cylinder body, a cylinder rod and a guide sleeve arranged at the end of the cylinder body, the guide sleeve is provided with a dustproof ring, a lip ring, an O-ring and a steel wire retainer, and the end of the cylinder rod is provided with an adjusting bolt and a locking nut.

[0020] As preferred in the present application, the front and rear ends of the side surface of the cylinder body are respectively provided with a front oil port for connecting the motor oil supply pipe and a rear oil port for connecting the cylinder oil supply pipe, and the front oil port forms an open gap for the flow of hydraulic oil at the end of the cylinder rod stroke.

[0021] As preferred in the application, the cutting platform reversing device further comprises a cutting platform driving input pulley, a cutting platform main input shaft, a reset spring, a fixing plate, a cylinder mounting plate, a cutting platform main input shaft chain, a cutting platform driven shaft gear and a cutting platform driven shaft.

[0022] The cutting platform main input shaft and the cutting platform driven shaft are both rotatably arranged on the cutting platform.

[0023] The cutting platform driving input pulley and the cutting platform main input shaft gear are respectively connected to two ends of the cutting platform main input shaft, the cutting platform driven shaft gear is connected to one end of the cutting platform driven shaft, and the cutting platform main input shaft gear is connected to the cutting platform driven shaft gear through the cutting platform main input shaft chain.

[0024] The reversing swing arm is rotatably connected to the cutting platform through a pin shaft, the reversing motor and the cylinder mounting plate are both mounted on the reversing swing arm, and the reversing cylinder is mounted on the cylinder mounting plate.

[0025] The fixing plate is mounted on the cutting platform, an extension of the fixing plate movably mounts a pull rod, the reset spring is mounted on the back of the extension and connected to the rear end of the pull rod, and the end of the pull rod away from the reset spring is connected to the cylinder mounting plate through a nut.

[0026] As preferred in the application, the reversing gear is connected to the output shaft of the reversing motor through a flat key and a shaft sleeve.

[0027] The application further provides a corn harvester cutting platform reversing hydraulic drive method, comprising the following steps:

[0028] S1, starting the hydraulic power unit, the engine drives the walking pump and the gear pump to work, the gear pump sucks hydraulic oil from the hydraulic oil tank through the gear pump oil suction pipe, and delivers the hydraulic oil to the electric control reversing control valve through the shunt valve and the reversing control valve oil supply pipe;

[0029] S2, when the cutting platform needs to be reversed, the driver triggers the reversing instruction in the cab, the electric control reversing control valve is powered to reverse, and the hydraulic oil enters the rear oil port of the reversing cylinder through the cylinder oil supply pipe;

[0030] S3, the hydraulic oil pushes the cylinder rod of the reversing cylinder to extend, the cylinder rod is pressed on the extension of the fixing plate, the resistance of the reset spring is overcome, the cylinder body and the cylinder mounting plate and the reversing swing arm mounted thereon are driven to rotate around the pin shaft;

[0031] S4, the rotation of the reversing swing arm drives the reversing motor and the reversing gear mounted thereon to move towards the cutting platform main input shaft gear until the reversing gear is fully meshed with the cutting platform main input shaft gear.

[0032] S5, when the cylinder rod moves to the end of the stroke, an open gap is formed between the cylinder rod and the cylinder body, and the hydraulic oil enters the reversing motor through the gap and the motor oil supply pipe to drive the reversing motor to rotate;

[0033] S6, the reversing motor drives the reversing gear to rotate in reverse through the key and the shaft sleeve, and the reversing gear drives the cutter main input shaft gear and the cutter main input shaft to rotate in reverse through gear meshing;

[0034] S7, the reverse movement of the cutter main input shaft is transmitted to the front end clutch through the cutter main drive pulley, driving the elevator and the peeling machine mechanical drive part to reverse; on the other hand, the cutter driven shaft gear and the cutter driven shaft are driven to reverse by the cutter main input shaft chain, so as to realize the reverse of the whole cutter mechanism;

[0035] S8, when the reverse operation is completed, the electric control reverse control valve is de-energized and reset, the hydraulic oil supply is cut off, the cylinder rod of the reversing cylinder is retracted under the restoring force of the return spring, the reversing swing arm is pulled to rotate in the reverse direction through the pull rod, the reversing gear is disengaged from the cutter main input shaft gear, and the system returns to standby state.

[0036] The corn harvester cutter reverse hydraulic drive system provided by the application has the following advantages compared with the prior art:

[0037] 1. simple arrangement and high system integration: the system takes oil from the original hydraulic system of the whole machine, reasonably distributes the oil source by using a gear pump and a flow divider, does not need to separately add a hydraulic pump or significantly modify the original hydraulic system, and significantly reduces the system integration difficulty. The reverse execution mechanism adopts modular design, the reversing cylinder and the reversing motor are matched through optimized structure, the hydraulic oil circuit and the mechanical transmission structure are arranged compactly, and the modification and installation on different types of cutters are facilitated.

[0038] 2. convenient operation and high safety: the system uses an electric control reverse control valve as a core control unit, and can realize all reverse actions through one-key triggering of an electric signal in the cab, completely avoiding the driver's off-car operation required by traditional mechanical wire control, improving the operation efficiency, and significantly improving the operation safety.

[0039] 3. strong reliability and easy maintenance: the reverse device does not participate in work in the non-reverse state, has no additional wear and power consumption, and has a longer service life. The end of the key component, such as the reversing cylinder, is provided with a combined sealing and guiding structure, and has excellent dustproof and sealing performance; the front oil port forms an open gap at the end of the stroke, which can smoothly guide the oil into the reversing motor, and the action is accurate and stable. The mechanical transmission part is simplified, has few maintenance points, and is more convenient to disassemble, assemble and maintain.

[0040] 4. Low cost and good versatility: The system requires a small number of additional hydraulic components, including only electric control valves, oil cylinders and gear motors, and most of the components can be directly selected and purchased, effectively controlling the cost. The hydraulic part is compatible with the original system of the whole machine, without the need for additional hydraulic oil tank or cooling unit, with good economy and promotion value.

[0041] In summary, the system effectively overcomes the shortcomings of high cost and complex system matching of traditional hydraulic schemes while retaining the advantages of convenient hydraulic drive operation, and has the modularity and economy of mechanical transmission, with overall performance significantly better than existing technologies. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structural schematic diagram of a corn harvester header reverse hydraulic drive system of the present application.

[0043] Figure 2 is a schematic diagram of the header structure in the present application;

[0044] Figure 3 is a partial enlarged schematic diagram of the header reversing device of the present application;

[0045] Figure 4 is an enlarged schematic diagram of the internal structure of the reversing oil cylinder of the present application;

[0046] Figure 5 is a hydraulic control principle diagram of a corn harvester header reverse hydraulic drive system of the present application.

[0047] Reference signs: 1, reversing oil cylinder; 1-1, cylinder body; 1-2, cylinder rod; 1-3, guide sleeve; 1-4, dustproof ring; 1-5, lip ring; 1-6, O-ring; 1-7, steel wire retainer; 1-8, adjusting bolt; 1-9, locking nut; 2, reversing motor; 3, header; 4, reversing swing arm; 5, reversing gear; 6, header main input shaft gear; 7, engine; 8, traveling pump; 9, gear pump; 10, gear pump oil suction pipe; 11, hydraulic oil tank; 12, flow divider; 13, flow divider oil supply pipe; 14, flow divider oil drain pipe; 15, electric control reversing control valve; 16, reversing control valve oil supply pipe; 17, oil cylinder oil supply pipe; 18, reversing control valve oil drain pipe; 19, motor oil supply pipe; 20, motor oil drain pipe; 21, header driving input pulley; 22, header main input shaft; 23, return spring; 24, fixed plate; 24-1, extension, 24-2, pull rod; 24-3, spring mounting seat; 25, oil cylinder mounting plate; 26, header main input shaft chain; 27, header driven shaft gear; 28, header driven shaft. DETAILED DESCRIPTION

[0048] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0049] Reference is made to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application. Figure 1 Figure 5 In order to overcome the deficiencies of the existing corn harvester header reverse driving system in power supply and control, the present application provides a corn harvester header reverse hydraulic driving system. The system includes a hydraulic power unit, a control valve group, an execution element and a header reversing device.

[0050] The hydraulic power unit plays a crucial role as the power source of the entire system. It includes an engine 7, which is firmly installed on the vehicle frame to provide basic power support for the entire system. The traveling pump 8 is installed on the engine 7, and its input end is tightly connected to the output end of the engine 7. Under the drive of the engine 7, the traveling pump 8 can provide hydraulic power for the vehicle's travel. The gear pump 9 is also installed on the traveling pump 8, and its input end is connected to the output end of the engine 7. The inlet of the gear pump 9 is connected to the hydraulic oil tank 11 on the vehicle frame through the gear pump oil suction pipe 10. Under the drive of the engine 7, the gear pump 9 sucks hydraulic oil from the hydraulic oil tank 11 to provide a hydraulic oil source for the subsequent header reversing action. The inlet of the shunt valve 12 is connected to the outlet of the gear pump 9 through the shunt valve oil supply pipe 13, and its outlet is connected to the hydraulic oil tank 11 through the shunt valve oil drain pipe 14. The shunt valve 12 can reasonably distribute the hydraulic oil output by the gear pump 9, ensuring stable hydraulic supply to each part of the system, while returning excess hydraulic oil to the hydraulic oil tank 11 through the shunt valve oil drain pipe 14 to ensure normal operation of the system.

[0051] The control valve group in this embodiment is an electrically controlled reverse control valve 15, which is a key component for controlling the flow direction of hydraulic oil. The inlet of the electrically controlled reverse control valve 15 is connected to the outlet of the gear pump 9 through the reverse control valve oil supply pipe 16, its first outlet is connected to the reverse cylinder 1 through the oil cylinder oil supply pipe 17, and its second outlet is connected to the hydraulic oil tank 11 through the reverse control valve oil drain pipe 18. When the electrically controlled reverse control valve 15 is powered on, the valve core inside it will move, changing the flow direction of the hydraulic oil, so that the hydraulic oil can enter the reverse cylinder 1 according to the predetermined path, thereby driving the reverse cylinder 1 to act; when the electrically controlled reverse control valve 15 is powered off, the valve core returns to the initial position, cutting off the supply of hydraulic oil, and returning excess hydraulic oil to the hydraulic oil tank 11 through the reverse control valve oil drain pipe 18.

[0052] ​In the actual work process, after starting the hydraulic power unit, the engine 7 starts to operate to drive the walking pump 8 and the gear pump 9 to work. The gear pump 9 sucks hydraulic oil from the hydraulic oil tank 11 through the gear pump oil suction pipe 10, and delivers the hydraulic oil to the distributor valve 12 through the distributor valve oil supply pipe 13. The output end of the distributor valve 12 is connected with multiple groups of lifting oil cylinders, which are used for lifting actions of various components of the machine, such as the header cylinder lifting action and the fruit box cylinder lifting action, which are not the focus of this application and will not be described here.

[0053] At the same time, part of the hydraulic oil is delivered to the electric control reverse control valve 15 through the reverse control valve oil supply pipe 16. At this time, the electric control reverse control valve 15 is in the initial state, and the hydraulic oil cannot enter the reverse cylinder 1. When the header reverse operation is needed, the driver triggers the reverse command in the cab, and the electric control reverse control valve 15 is powered to reverse, and the hydraulic oil enters the reverse cylinder 1 through the cylinder oil supply pipe 17 to drive the reverse cylinder 1 to act, and then the header is reversed through the subsequent executive element and the header reversing device.

[0054] This embodiment focuses on the structure and working principle of the executive element. The executive element includes the reverse cylinder 1 and the reverse motor 2, which cooperate with each other in the system to complete the power transmission and driving task of the header reversing.

[0055] The reverse cylinder 1 is one of the core components of the executive element, which includes a cylinder body 1-1, a cylinder rod 1-2, and a guide sleeve 1-3 arranged at the end of the cylinder body 1-1. The guide sleeve 1-3 is provided with a dustproof ring 1-4, a lip ring 1-5, an O-ring 1-6, and a steel wire retainer 1-7. These sealing elements can effectively prevent dust and impurities from entering the inside of the cylinder body, while ensuring the sealing performance between the cylinder body and the cylinder rod to prevent hydraulic oil leakage. The end of the cylinder rod 1-2 is provided with an adjusting bolt 1-8 and a locking nut 1-9. The adjusting bolt 1-8 can adjust the extension length of the cylinder rod 1-2, and the locking nut 1-9 is used to fix the adjusted position to ensure the working accuracy and stability of the reverse cylinder 1.

[0056] The front and rear ends of the side surface of the cylinder body 1-1 are respectively provided with a front oil port for connecting the motor oil supply pipe 19 and a rear oil port for connecting the cylinder oil supply pipe 17. The front oil port forms an open gap for hydraulic oil circulation at the end of the stroke of the cylinder rod 1-2, which is one of the key innovations of this embodiment. When the cylinder rod 1-2 moves to the end of the stroke, an open gap is formed between the front oil port and the cylinder rod 1-2, so that the hydraulic oil can smoothly pass through the gap to enter the subsequent oil circuit to drive the reverse motor 2 to work.

[0057] The inlet of the reversing motor 2 is connected with the outlet of the reversing cylinder 1 through the motor oil supply pipe 19, and the outlet is connected with the reversing control valve 15 through the motor oil drain pipe 20. In the normal working state, when the cylinder rod 1-2 of the reversing cylinder 1 extends to the end of the stroke, the hydraulic oil enters the reversing motor 2 through the opening gap via the motor oil supply pipe 19 to drive the reversing motor 2 to rotate. The power generated by the rotation of the reversing motor 2 is transmitted to the subsequent header reversing device through the output shaft to realize the reversing action of the header. At the same time, the hydraulic oil in the reversing motor 2 is returned to the reversing control valve 15 through the motor oil drain pipe 20, and then returned to the hydraulic oil tank 11 through the oil drain passage of the reversing control valve 15 to complete the circulation of the hydraulic oil.

[0058] In the actual working process, when the electric control reversing control valve 15 is powered on and commutated, the hydraulic oil enters the rear oil port of the reversing cylinder 1 through the cylinder oil supply pipe 17 to push the cylinder rod 1-2 to extend. As the cylinder rod 1-2 continuously extends, when it reaches the end of the stroke, an opening gap is formed between the front oil port and the cylinder rod 1-2, and the hydraulic oil enters the reversing motor 2 through the gap to drive the reversing motor 2 to rotate. The power generated by the rotation of the reversing motor 2 is transmitted to the header reversing device through the output shaft to realize the reversing of the header. After the header reversing operation is completed, the electric control reversing control valve 15 is powered off and reset to cut off the supply of hydraulic oil, and the cylinder rod 1-2 of the reversing cylinder 1 is retracted under the action of the reset spring, and at the same time the reversing motor 2 stops rotating, and the system returns to the standby state.

[0059] The embodiment details the structure and working process of the header reversing device. The header reversing device is installed on the header 3 and is a key component for realizing the reversing of the header, which includes a reversing swing arm 4 driven by the reversing cylinder 1, a reversing gear 5 connected with the output end of the reversing motor 2, and a header main input shaft gear 6.

[0060] The header reversing device further includes a header main driving pulley 21, a header main input shaft 22, a reset spring 23, a fixed plate 24, a cylinder mounting plate 25, a header main input shaft chain 26, a header driven shaft gear 27, and a header driven shaft 28. The header main input shaft 22 and the header driven shaft 28 are both rotatably arranged on the header 3 to provide basic support for the transmission of the header. The header main driving pulley 21 and the header main input shaft gear 6 are respectively connected to the two ends of the header main input shaft 22, the header driven shaft gear 27 is connected to one end of the header driven shaft 28, and the header main input shaft gear 6 is connected with the header driven shaft gear 27 through the header main input shaft chain 26 to form a complete transmission chain, which ensures the power transmission between the components of the header.

[0061] The reverse swing arm 4 is connected to the header 3 by a pin shaft, which allows the reverse swing arm 4 to rotate around the pin shaft. The reverse motor 2 and the oil cylinder mounting plate 25 are both mounted on the reverse swing arm 4, and the reverse oil cylinder 1 is mounted on the oil cylinder mounting plate 25. When the cylinder rod 1-2 of the reverse oil cylinder 1 is extended, it will press against the extension 24-1 of the fixed plate 24, overcome the resistance of the return spring 23, and drive the cylinder body 1-1, the oil cylinder mounting plate 25, and the reverse swing arm 4 to rotate around the pin shaft.

[0062] The fixed plate 24 is mounted on the header 3, and the extension 24-1 is movably mounted with the pull rod 24-2. The return spring 23 is mounted on the back of the extension 24-1 and connected to the rear end of the pull rod 24-2. The end of the pull rod 24-2 away from the return spring 23 is connected to the oil cylinder mounting plate 25. Specifically, one end of the pull rod 24-2 is fixed to the oil cylinder mounting plate 25 by a nut, and the extension 24-1 is provided with an opening for the pull rod 24-2 to pass through. The other end of the pull rod 24-2 is mounted with the return spring 23 through the spring connecting seat 24-3, and the end of the return spring 23 away from the spring connecting seat 24-3 is fixed to the back of the extension 24-1. The function of the return spring 23 is to restore the reverse swing arm 4, the reverse motor 2, and other components to the initial position after the header reverse operation is completed, and to prepare for the next reverse operation.

[0063] The reverse gear 5 is connected to the output shaft of the reverse motor 2 by a flat key and a shaft sleeve. This connection ensures stable power transmission from the reverse motor 2 to the reverse gear 5, guarantees the coaxiality between the reverse gear 5 and the output shaft of the reverse motor 2, and reduces vibration and noise during transmission.

[0064] In the actual work process, when the reverse operation of the header is needed, the electric control reverse control valve 15 is powered on to change direction, the hydraulic oil enters the reverse cylinder 1, and the cylinder rod 1-2 is pushed out. The cylinder rod 1-2 presses on the extension 24-1 of the fixed plate 24, overcomes the resistance of the return spring 23, drives the cylinder body 1-1 and the oil cylinder mounting plate 25 mounted thereon and the reverse swing arm 4 to rotate around the pin shaft. The rotation of the reverse swing arm 4 drives the reverse motor 2 and the reverse gear 5 mounted thereon to move towards the header main input shaft gear 6 until the reverse gear 5 is fully engaged with the header main input shaft gear 6. When the cylinder rod 1-2 moves to the end of the stroke, an open gap is formed between the cylinder rod 1-2 and the cylinder body 1-1, and the hydraulic oil enters the reverse motor 2 through the gap and the motor oil supply pipe 19 to drive the reverse motor 2 to rotate. The reverse motor 2 drives the reverse gear 5 to rotate in the opposite direction through the flat key and shaft sleeve, and the reverse gear 5 drives the header main input shaft gear 6 and the header main input shaft 22 to reverse through gear engagement. The reverse movement of the header main input shaft 22 drives the front end clutch through the header main drive pulley 21, drives the elevator, peeler and other mechanical drive components to reverse, and drives the header driven shaft gear 27 and the header driven shaft 28 through the header main input shaft chain 26 to reverse, thereby realizing the reverse of the entire header mechanism. When the reverse operation is completed, the electric control reverse control valve 15 is powered off to reset, the hydraulic oil supply is cut off, the cylinder rod 1-2 of the reverse cylinder 1 is retracted under the restoring force of the return spring 23, the reverse swing arm 4 is pulled in the reverse direction through the pull rod 24-2 to make the reverse gear 5 disengage from the header main input shaft gear 6, and the system returns to the standby state.

[0065] The application also provides a method for realizing the reverse of the header of a corn harvester by a hydraulic drive system of the header, which describes the entire process from the start of the system to the reverse of the header and the completion of the reverse operation, and the specific steps are as follows:

[0066] S1, start the hydraulic power unit, the engine 7 starts to operate to drive the walking pump 8 and the gear pump 9 to work. The gear pump 9 sucks hydraulic oil from the hydraulic oil tank 11 through the gear pump oil suction pipe 10, and delivers the hydraulic oil to the shunt valve 12 and the reverse control valve oil supply pipe 16 through the shunt valve oil supply pipe 13 and the electric control reverse control valve 15. At this time, the shunt valve 12 reasonably distributes the hydraulic oil to ensure that each part of the system is stably supplied with hydraulic oil, and at the same time, the excess hydraulic oil is returned to the hydraulic oil tank 11 through the shunt valve drain pipe 14; the electric control reverse control valve 15 is in the initial state, the hydraulic oil cannot enter the reverse cylinder 1, and the system is in the standby state.

[0067] S2, when the header needs to be reversed, the driver triggers the reverse command in the cab, and the electric control reverse control valve 15 is powered on to change direction. The valve core inside the electric control reverse control valve 15 moves to change the flow direction of the hydraulic oil, so that the hydraulic oil enters the rear oil port of the reverse cylinder 1 through the oil cylinder oil supply pipe 17.

[0068] S3, after the hydraulic oil enters the rear oil port of the reversing oil cylinder 1, the cylinder rod 1-2 of the reversing oil cylinder 1 is pushed out. The cylinder rod 1-2 presses on the extension 24-1 of the fixed plate 24, overcomes the resistance of the return spring 23, drives the cylinder body 1-1, the oil cylinder mounting plate 25 mounted thereon and the reversing swing arm 4 to rotate around the pin shaft. In this process, the rotation of the reversing swing arm 4 drives the reversing motor 2 and the reversing gear 5 mounted thereon to move towards the header main input shaft gear 6.

[0069] S4, as the reversing swing arm 4 continues to rotate, the reversing gear 5 gradually approaches the header main input shaft gear 6 until they are fully engaged. This process requires precise control to ensure that the reversing gear 5 and the header main input shaft gear 6 can be smoothly and accurately engaged, avoiding problems such as gear collision and jamming.

[0070] S5, when the cylinder rod 1-2 moves to the end of the stroke, an opening gap is formed between the cylinder rod 1-2 and the cylinder body 1-1. Hydraulic oil enters the reversing motor 2 through this gap and the motor oil supply pipe 19, providing power to the reversing motor 2 to drive it to rotate.

[0071] S6, when the reversing motor 2 rotates, it drives the reversing gear 5 to rotate in the opposite direction through the flat key and shaft sleeve. The reversing gear 5 engages with the header main input shaft gear 6, which drives the header main input shaft gear 6 and the header main input shaft 22 to reverse through the gear engagement transmission method. This transmission method has the advantages of accurate transmission ratio, high transmission efficiency and reliable operation.

[0072] S7, the reversing movement of the header main input shaft 22 has two effects. On the one hand, it is transmitted to the front end clutch through the header drive input pulley 21, driving the mechanical drive components such as the elevator and the peeling machine to reverse, realizing the reverse operation of these components and meeting different working requirements; on the other hand, it drives the header driven shaft gear 27 and the header driven shaft 28 to reverse through the header main input shaft chain 26, so that all the transmission components of the header can work cooperatively, realizing the reverse of the entire header mechanism.

[0073] S8, when the reverse operation is completed, the driver triggers the command again, and the electric control reversing control valve 15 loses power and resets. The valve core inside the electric control reversing control valve 15 returns to the initial position, cutting off the supply of hydraulic oil. The cylinder rod 1-2 of the reversing oil cylinder 1 is retracted under the restoring force of the return spring 23, and the reversing swing arm 4 is pulled in the opposite direction through the pull rod 24-2, so that the reversing gear 5 and the header main input shaft gear 6 disengage. At this time, the system returns to standby state, waiting for the next reverse operation command.

[0074] Through the complete process, the corn harvester header reverse hydraulic drive system can realize stable and reliable reverse of the header, improve the working efficiency and flexibility of the corn harvester, and meet diversified needs in actual production.

[0075] The above examples are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them; although the embodiments of the present application are described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope defined by the claims of the present application.

Claims

1. A corn harvester header counter rotating hydraulic drive system, characterized by, The utility model relates to a hydraulic power unit for providing a hydraulic oil source, a control valve group connected with the hydraulic power unit for controlling the flow direction of hydraulic oil, an execution element including a reversing cylinder (1) connected with the control valve group and driven to actuate a mechanical transmission component according to a hydraulic signal, and a reversing motor (2) connected with the reversing cylinder (1) and driven to rotate by hydraulic oil after the reversing cylinder (1) is actuated, a header reversing device installed on a header (3) and including a reversing swing arm (4) driven by the reversing cylinder (1), a reversing gear (5) connected with the output end of the reversing motor (2), and a header main input shaft gear (6), the reversing swing arm (4) being capable of engaging or disengaging the reversing gear (5) with the header main input shaft gear (6) under the driving of the reversing cylinder (1), wherein the control valve group, when powered, drives the reversing cylinder (1) and the reversing motor (2) in sequence, and then the header reversing device is used to realize header reversing. The hydraulic power unit includes an engine (7) installed on a vehicle frame, a traveling pump (8) installed on the engine (7) and having an input end connected with the output end of the engine (7), a gear pump (9) installed on the traveling pump (8) and having an input end connected with the output end of the engine (7) and an inlet connected with a hydraulic oil tank (11) on the vehicle frame through a gear pump oil suction pipe (10), and a flow divider valve (12) having an inlet connected with the outlet of the gear pump (9) through a flow divider valve oil supply pipe (13) and an outlet connected with the hydraulic oil tank (11) through a flow divider valve oil discharge pipe (14). The control valve group is an electrically-controlled reversing control valve (15) having an inlet connected with the outlet of the gear pump (9) through a reversing control valve oil supply pipe (16), a first outlet connected with the reversing cylinder (1) through a cylinder oil supply pipe (17), and a second outlet connected with the hydraulic oil tank (11) through a reversing control valve oil discharge pipe (18). In the execution element, the inlet of the reversing motor (2) is connected with the outlet of the reversing cylinder (1) through a motor oil supply pipe (19), and the outlet of the reversing motor (2) is connected with the reversing control valve (15) through a motor oil discharge pipe (20). The reversing cylinder (1) includes a cylinder body (1-1), a cylinder rod (1-2), and a guide sleeve (1-3) arranged at the end of the cylinder body (1-1), the guide sleeve (1-3) being provided with a dustproof ring (1-4), a lip-shaped ring (1-5), an O-shaped ring (1-6), and a steel wire retainer (1-7), and the end of the cylinder rod (1-2) being provided with an adjusting bolt (1-8) and a locking nut (1-9). The front and rear ends of the side surface of the cylinder body (1-1) are respectively provided with a front oil port for connecting the motor oil supply pipe (19) and a rear oil port for connecting the cylinder oil supply pipe (17), and the front oil port forms an open gap for hydraulic oil circulation at the end of the stroke of the cylinder rod (1-2).

2. The corn harvester head counter rotating hydraulic drive system of claim 1, wherein, ​ ​ ​ ​ ​ 3. The corn harvester head counter rotating hydraulic drive system of claim 2, wherein, ​ 4. The corn harvester head counter rotating hydraulic drive system of claim 3, wherein, ​ ​ 5. The corn harvester head counter rotating hydraulic drive system of claim 4, wherein, ​ 6. The corn harvester head counter rotating hydraulic drive system of claim 5, wherein, ​ 7. The corn harvester head counter rotating hydraulic drive system of claim 6, wherein, The cutting platform reversing device further comprises a cutting platform driving input pulley (21), a cutting platform main input shaft (22), a reset spring (23), a fixed plate (24), a cylinder mounting plate (25), a cutting platform main input shaft chain (26), a cutting platform driven shaft gear (27) and a cutting platform driven shaft (28); The cutting platform main input shaft (22) and the cutting platform driven shaft (28) are both rotatably arranged on the cutting platform (3); The cutting platform driving input pulley (21) and the cutting platform main input shaft gear (6) are respectively connected to two ends of the cutting platform main input shaft (22), the cutting platform driven shaft gear (27) is connected to one end of the cutting platform driven shaft (28), and the cutting platform main input shaft gear (6) is connected with the cutting platform driven shaft gear (27) through the cutting platform main input shaft chain (26); The reversing swing arm (4) is rotatably connected to the cutting platform (3) through a pin shaft, the reversing motor (2) and the cylinder mounting plate (25) are both mounted on the reversing swing arm (4), and the reversing cylinder (1) is mounted on the cylinder mounting plate (25); The fixed plate (24) is mounted on the cutting platform (3), an extension (24-1) of the fixed plate (24) movably mounts a pull rod (24-2), the reset spring (23) is mounted on the back of the extension (24-1) and connected with the rear end of the pull rod (24-2), and one end of the pull rod (24-2) away from the reset spring (23) is connected with the cylinder mounting plate (25) through a nut.

8. The corn harvester head counter rotating hydraulic drive system of claim 7, wherein, The reversing gear (5) is connected with the output shaft of the reversing motor (2) through a flat key and a shaft sleeve.

9. A method of implementing header roll-back using the header roll-back hydraulic drive system of claim 8, wherein, The method comprises the following steps: S1, starting the hydraulic power unit, the engine (7) drives the walking pump (8) and the gear pump (9) to work, the gear pump (9) sucks hydraulic oil from the hydraulic oil tank (11) through the gear pump oil suction pipe (10), and the hydraulic oil is delivered to the shunt valve (12) through the shunt valve oil supply pipe (13) and to the electric control reversing control valve (15) through the reversing control valve oil supply pipe (16); S2, when the cutting platform needs to be reversed, the driver triggers the reversing instruction in the cab, the electric control reversing control valve (15) is powered on and reversed, and the hydraulic oil enters the rear oil port of the reversing cylinder (1) through the cylinder oil supply pipe (17); S3, the hydraulic oil pushes the cylinder rod (1-2) of the reversing cylinder (1) to extend, the cylinder rod (1-2) presses on the extension (24-1) of the fixed plate (24), overcomes the resistance of the reset spring (23), drives the cylinder body (1-1) and the cylinder mounting plate (25) and the reversing swing arm (4) mounted thereon to rotate around the pin shaft; S4, the rotation of the reversing swing arm (4) drives the reversing motor (2) and the reversing gear (5) mounted thereon to move towards the cutting platform main input shaft gear (6), until the reversing gear (5) is completely meshed with the cutting platform main input shaft gear (6); S5, when the cylinder rod (1-2) moves to the end of the stroke, an opening gap is formed between the cylinder rod (1-2) and the cylinder body (1-1), the hydraulic oil enters the reversing motor (2) through the gap and the motor oil supply pipe (19), and drives the reversing motor (2) to rotate. S6, reverse the motor (2) by the key and shaft sleeve drive reverse gear (5) reverse rotation, reverse gear (5) through gear meshing driven header main input shaft gear (6) and header main input shaft (22) reverse; S7, the reverse movement of the header main input shaft (22) is transmitted to the front end clutch through the header drive input pulley (21), driving the elevator, peeling machine mechanical drive components reverse; on the other hand, through the header main input shaft chain (26) drive header driven shaft gear (27) and header driven shaft (28) reverse, so as to realize the reverse of the whole header mechanism; S8, when the reverse operation is completed, the electric control reverse control valve (15) is de-energized and reset, the hydraulic oil supply is cut off, the cylinder rod (1-2) of the reverse cylinder (1) is retracted under the restoring force of the reset spring (23), the reverse swing arm (4) is pulled in reverse rotation through the pull rod (24-2), the reverse gear (5) is disengaged from the header main input shaft gear (6), and the system returns to standby state.

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