Hydraulic system for sudden stop of header or feeding motor of silage maize harvester

Abstract

The utility model relates to a hydraulic system for sudden stop of a header or a feeding motor of a silage maize harvester, and aims to solve the problem of air suction of the hydraulic motor after hydraulic oil supply is cut off. The hydraulic system comprises a hydraulic motor, a first reversing valve, a second reversing valve, a hydraulic pump and a one-way valve, wherein the hydraulic motor is connected with the hydraulic pump and the first reversing valve in series. The first reversing valve controls the flow direction of hydraulic oil, the hydraulic motor rotates forwards or reversely according to the oil flow direction, and the second reversing valve is connected with the foreign matter sensor and used for controlling switching of oil ways. The one-way valve is connected to the first reversing valve in parallel and supplies oil to the hydraulic motor, and air suction of the hydraulic motor is prevented. The hydraulic pump is connected with the hydraulic motor through first and second oil ways, and the first reversing valve is located on the first oil way. By optimizing the flow direction control of the hydraulic oil, the air suction phenomenon caused by oil supply interruption when the hydraulic motor is suddenly stopped is avoided, the stability and safety of the system are improved, and the system has high practicability and reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a silage machine cutting platform or hydraulic system of feeding motor emergency stop. BACKGROUND

[0002] In the hydraulic system of agricultural machinery equipment such as silage machine, the driving of hydraulic motor is closely related to the supply of hydraulic oil. Hydraulic motor usually relies on the flow of hydraulic oil to provide power, so as to drive important components such as cutting platform or feeding motor. However, in some emergency situations, such as hydraulic system needs to be stopped or shut down, it is necessary to cut off the hydraulic oil supply of hydraulic motor. However, in the prior art, after cutting off the hydraulic oil supply, the phenomenon of hydraulic motor air suction often occurs, resulting in a series of adverse consequences.

[0003] The air suction of hydraulic motor refers to the phenomenon that after the supply of hydraulic oil is stopped, due to the lack of sufficient oil pressure in the motor, gas or air enters the internal motor. This not only affects the normal work of hydraulic motor, but also causes the efficiency of hydraulic system to decrease, the noise to increase, and even may cause damage to the equipment. In agricultural machinery equipment, the air suction phenomenon of hydraulic motor is particularly serious, which may cause the motor to start not smoothly, and even cause system failure or damage. Therefore, how to effectively prevent the air suction of hydraulic motor after emergency stop has become an important technical problem to improve the reliability and performance of hydraulic system.

[0004] The existing solution usually relies on increasing more complex oil circuit design, adding oil storage device or using specific check valve to prevent air suction. However, these methods often have certain limitations. For example, adding oil storage device may occupy more space and increase system complexity, and certain check valve design may not be able to fully solve the problem of air suction after interruption of hydraulic oil supply. Therefore, the prior art has not yet provided an efficient, reliable and simple solution to prevent the air suction of hydraulic motor.

[0005] In view of this problem, the present application proposes an optimized hydraulic system design, which can effectively avoid the air suction of hydraulic motor during emergency stop by improving the connection mode of hydraulic motor and reversing valve, and introducing the cooperative work of check valve and foreign matter sensor. The system can ensure that the hydraulic motor can obtain sufficient oil supplement while cutting off the supply of hydraulic oil, so as to avoid the air suction of motor and ensure the stability of hydraulic system and the long-term reliable operation of equipment. Utility model content:

[0006] The utility model aims at solving the above prior art, and provides a silage machine cutting platform or hydraulic system of feeding motor emergency stop.

[0007] The hydraulic system of a silage harvester or a feeding motor emergency stop comprises a hydraulic motor, a first reversing valve, a second reversing valve, a hydraulic pump and a one-way valve, the hydraulic motor, the first reversing valve and the hydraulic pump are connected in series, the first reversing valve is used for controlling the flow direction of hydraulic oil in an oil circuit, the hydraulic motor rotates forward or reverses according to the flow direction of the hydraulic oil in the oil circuit, the second reversing valve is used for controlling the switching of the first reversing valve, the second reversing valve is connected with a foreign matter sensor, the foreign matter sensor controls the switching of the second reversing valve, the one-way valve is used for supplying oil to the hydraulic motor, the one-way valve is connected with the first reversing valve in parallel, the inlet of the one-way valve is connected with the hydraulic pump, and the outlet of the one-way valve is connected with the hydraulic motor, so that the hydraulic motor is prevented from being vacuumized.

[0008] Further, the hydraulic oil pump is connected with the two ends of the hydraulic motor through a first oil circuit and a second oil circuit respectively, and the first reversing valve is arranged on the first oil circuit.

[0009] Further, the first reversing valve is a two-position three-way reversing valve, which comprises a first oil port, a second oil port and a third oil port, the first oil port is connected with the hydraulic pump, the third oil port is connected with the hydraulic motor, and the second oil port is connected with the second oil circuit through a third oil circuit.

[0010] The first reversing valve comprises a first position and a second position, and the first position is a normal position.

[0011] In the first position, the first oil port is communicated with the third oil port, and the second oil port is closed; in the second position, the first oil port is communicated with the second oil port, and the third oil port is closed.

[0012] Further, the second reversing valve is a two-position four-way reversing valve, which comprises a fourth oil port, a fifth oil port, a sixth oil port and a seventh oil port, the fourth oil port is connected with the second oil circuit, the fifth oil port is connected with an oil return tank, the sixth oil port is connected with the inlet of the first reversing valve control oil circuit, and the seventh oil port is connected with the outlet of the first reversing valve control oil circuit.

[0013] The second reversing valve comprises a third position and a fourth position, and the third position is a normal position.

[0014] In the first position, the fourth oil port is connected with the sixth oil port, and the fifth oil port and the seventh oil port are connected; in the second position, the fourth oil port is connected with the seventh oil port, and the fifth oil port and the sixth oil port are connected.

[0015] Further, an overflow valve is arranged on the oil circuit.

[0016] Further, the first reversing valve is a switch valve.

[0017] Beneficial effects: compared with the prior art, the silage harvester or the feeding motor emergency stop hydraulic system has the following advantages.

[0018] By introducing the oil supplement function of the check valve, the system can supplement hydraulic oil in time after the first reversing valve switches, ensuring that the hydraulic motor always maintains sufficient oil supply during the reversing process. This avoids the suction phenomenon of the hydraulic motor when the oil circuit switches, effectively ensuring the normal operation of the hydraulic motor.

[0019] The oil supplement function of the check valve not only prevents the suction phenomenon from occurring, but also effectively prevents cavitation from occurring due to insufficient oil or pressure fluctuations during operation of the hydraulic motor. Cavitation not only damages the hydraulic motor, but also leads to a decrease in system efficiency. By reasonably designing the oil supplement function of the check valve, cavitation can be effectively reduced, the impact caused by instantaneous pressure changes can be reduced, and the service life of the hydraulic motor can be extended.

[0020] After adding the check valve oil supplement in the oil circuit, the stability of the system during the reversing process can be greatly improved, reducing the uncertainty caused by internal pressure fluctuations. This design allows the hydraulic system to run more smoothly under high load conditions such as emergency stop and reversing, enhancing the safety and reliability of the overall system.

[0021] By avoiding suction and cavitation of the hydraulic motor during reversing, the time required for maintenance due to system failure is reduced, improving work efficiency. The oil supplement mechanism of the hydraulic system ensures that the equipment can still operate stably in harsh environments, enhancing the continuous working ability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of a hydraulic system;

[0023] Figure 2 is a schematic diagram of a first reversing valve;

[0024] Figure 3 is a schematic diagram of a second reversing valve;

[0025] In the figure, 1 is a hydraulic pump, 2 is a first reversing valve, 3 is a check valve, 4 is a relief valve, 5 is a hydraulic motor, 6 is a second reversing valve, 7 is a first station, 8 is a second station, 9 is a first oil port, 10 is a second oil port, 11 is a third oil port, 12 is a third station, 13 is a fourth station, 14 is a fourth oil port, 15 is a fifth oil port, 16 is a sixth oil port, 17 is a seventh oil port, 18 is a first oil circuit, 19 is a second oil circuit, and 20 is a third oil circuit. DETAILED DESCRIPTION

[0026] In order to deepen the understanding of the present application, the present application will be further described in conjunction with the embodiments and drawings. The embodiments are only used to explain the present application and do not constitute a limitation on the scope of protection of the present application.

[0027] The embodiment provides a hydraulic system for controlling the emergency stop of a silage harvester header or feeding motor, and particularly relates to the cooperative work of a hydraulic motor, a reversing valve, a hydraulic pump and a foreign matter sensor.

[0028] System components and structures:

[0029] The hydraulic system comprises a hydraulic motor 5, a first reversing valve 2, a second reversing valve 6, a hydraulic pump 1 and a check valve 3, wherein the hydraulic motor 5, the first reversing valve 2 and the hydraulic pump 1 are connected in series, the first reversing valve 2 is used for controlling the flow direction of hydraulic oil in an oil circuit, the hydraulic motor 5 rotates forward or reverses according to the flow direction of the hydraulic oil in the oil circuit, the second reversing valve 6 is used for controlling the switching of the working position of the first reversing valve 2, the second reversing valve 6 is connected with the foreign matter sensor, the foreign matter sensor controls the switching of the working position of the second reversing valve 6, the oil circuit in which the check valve 3 is located is used for supplying oil to the hydraulic motor 5, the check valve 3 is connected with the first reversing valve 2 in parallel, the inlet of the check valve 3 is connected with the hydraulic pump 1, and the outlet of the check valve 3 is connected with the hydraulic motor 5.

[0030] The hydraulic pump 1 provides power for the hydraulic motor 5 through the oil circuit, and drives the operation of the silage harvester header or the feeding motor. The output end of the hydraulic pump 1 is connected with a first oil circuit 18 and a second oil circuit 19, and the first oil circuit 18 and the second oil circuit 19 respectively provide forward and reverse hydraulic oil flow for the hydraulic motor 5.

[0031] The two ends of the hydraulic motor 5 are respectively connected with the hydraulic pump 1 through the first oil circuit 18 and the second oil circuit 19. The hydraulic motor 5 rotates forward or reverses according to the change of the flow direction of the hydraulic oil in the oil circuit under the driving of the oil flow, and further controls the working state of the silage harvester.

[0032] The first reversing valve 2 is a two-position three-way reversing valve, which is used for controlling the flow direction of the hydraulic oil in the oil circuit, and further controlling the rotating direction of the hydraulic motor 5. The first reversing valve 2 comprises:

[0033] A first oil port 9 is connected with the hydraulic pump 1;

[0034] A second oil port 10 is connected with the first reversing valve 2 in parallel;

[0035] A third oil port 11 is connected with the hydraulic motor 5;

[0036] A fourth oil port 14 is connected to the second oil circuit 19 through a third oil circuit 20.

[0037] The first reversing valve 2 has two working positions:

[0038] A first position 7 is that the hydraulic oil flows from the first oil port 9 to the third oil port 11, the hydraulic oil flows to the hydraulic motor 5 to drive the hydraulic motor 5 to rotate forward or reverse, and an oil return circuit is formed;

[0039] A second position 8 is that the hydraulic oil flows from the first oil port 9 to the second oil port 10, the hydraulic oil flows into the hydraulic motor 5 in the reverse direction to control the hydraulic motor 5 to stop.

[0040] The second reversing valve 6 is a two-position four-way reversing valve, which mainly controls the working state of the first reversing valve 2. The second reversing valve 6 is connected with the foreign matter sensor. When the sensor detects foreign matter, the signal will trigger the second reversing valve 6 to switch to the emergency stop state, and quickly stop the operation of the hydraulic motor 5.

[0041] The second reversing valve 6 includes:

[0042] The fifth oil port 15 is connected with the second oil path 19;

[0043] The sixth oil port 16 is connected with the oil return tank;

[0044] The seventh oil port 17 is connected with the control oil path of the first reversing valve 2.

[0045] The second reversing valve 6 also has two working positions:

[0046] The third working position 12: the sixth oil port 16 is connected with the seventh oil port 17, and the fifth oil port 15 is closed;

[0047] The fourth working position 13: the fifth oil port 15 is connected with the seventh oil port 17, and the sixth oil port 16 is closed.

[0048] In addition, the oil path system is provided with an overflow valve 4 for limiting the pressure of the hydraulic oil to prevent system overpressure from causing equipment damage. The setting of the overflow valve 4 can effectively protect the hydraulic system and improve the safety and stability of the system.

[0049] In the actual application of the system, when the silage machine header or the feeding motor is blocked or abnormally by foreign matter, the foreign matter sensor can quickly detect and trigger the second reversing valve 6 to switch to the emergency stop position. At this time, the first reversing valve 2 switches to the emergency stop position, cutting off the B1 port oil inlet path and no longer providing power source for the hydraulic motor 5. Due to inertia, the hydraulic motor 5 continues to rotate, and the oil path where the one-way valve 3 is located supplements the oil inlet of the hydraulic motor 5, avoiding air suction of the motor and reducing air erosion and impact on the motor. At the same time of cutting off the power source, high-pressure oil is divided through the A1 port, and the hydraulic oil forms a high reverse hydraulic braking force at the outlet of the hydraulic motor 5, so that the hydraulic motor 5 is quickly stopped, avoiding equipment damage and ensuring the safety of operation.

[0050] Working principle:

[0051] The working principle of the hydraulic control system is based on the change of the flow direction of the hydraulic oil to control the movement of the hydraulic motor 5, and the cooperation of the reversing valve and the foreign matter sensor realizes the emergency stop.

[0052] Normal working state:

[0053] When the system is working normally, the hydraulic pump 1 delivers hydraulic oil to the hydraulic motor 5 through the oil circuit. The first reversing valve 2 is in the first working position 7 in normal state, at this time, the first oil port 9 is communicated with the third oil port 11, the hydraulic oil flows to the oil inlet end of the hydraulic motor 5, and pushes the hydraulic motor 5 to rotate forward. The hydraulic oil flows from the B port to the B1 port, passes through the hydraulic motor 5, and then flows from the A1 port to the A port, forming a loop.

[0054] Emergency stop state:

[0055] The system realizes the emergency stop function through the combination of the second reversing valve 6 and the foreign matter sensor. The foreign matter sensor continuously monitors the potential danger in the system. When the sensor detects foreign matter or abnormal conditions, a signal is triggered to switch the second reversing valve 6 to the emergency stop position. At this time, the control circuit of the first reversing valve 2 is unloaded, and the first reversing valve 2 is switched to the second working position 8.

[0056] At this time, the power supply of the hydraulic motor 5 is cut off, that is, the hydraulic oil no longer flows from B to B1, but from B to the second oil circuit 19, but at this time, there is still residual hydraulic oil in the working oil circuit of the hydraulic motor 5, and due to inertia, the hydraulic motor 5 will continue to work in the original rotation direction, and the flow direction of this part of hydraulic oil is from B1 to A1; the one-way valve supplements the oil inlet of the motor to avoid air suction and reduce the cavitation and impact on the motor.

[0057] On the other hand, due to the switching of the second reversing valve to the second working position 8, the hydraulic oil supplied by the hydraulic pump 1 flows through the third oil circuit 20 to the second oil circuit 19 and is divided, most of the hydraulic oil flows to the A port, and the other part flows to the A1 port, and the flow direction of this part of hydraulic oil is from A1 to B1, which collides with the original hydraulic oil in the motor, reduces the inertia, and accelerates the hydraulic motor 5 to stop working, so that the system enters the emergency stop state, thereby effectively protecting the machine from damage.

[0058] In addition, it should be noted that the forward rotation and reverse rotation of the hydraulic motor are controlled by the direction of the oil pump output oil, and the first reversing valve is in the first working position (normal working position) when the hydraulic motor rotates forward or reversely, and the first reversing valve is switched to the second working position (emergency stop position) only when emergency stop is needed.

[0059] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hydraulic system for silage header or feed-in motor emergency stop, characterized in that, The hydraulic motor, the first reversing valve, the hydraulic pump, the one-way valve, the hydraulic motor, the first reversing valve, the hydraulic pump are connected in series, the first reversing valve is used for controlling the flow direction of the hydraulic oil in the oil circuit, the hydraulic motor rotates or reverses according to the flow direction of the hydraulic oil in the oil circuit, the second reversing valve is used for controlling the switching of the working position of the first reversing valve, the second reversing valve is connected with the foreign matter sensor, the foreign matter sensor controls the switching of the working position of the second reversing valve, the one-way valve is used for supplying oil to the hydraulic motor, the one-way valve is connected with the first reversing valve in parallel, the inlet of the one-way valve is connected with the hydraulic pump, the outlet of the one-way valve is connected with the hydraulic motor, and the one-way valve is used for preventing the hydraulic motor from being vacuumized.

2. A hydraulic system for silage header or feed-in motor emergency stop according to claim 1, characterized in that, The hydraulic oil pump is connected with the two ends of the hydraulic motor through the first oil circuit and the second oil circuit respectively.

3. A hydraulic system for silage header or feed-in motor emergency stop according to claim 2, characterized in that, The first reversing valve is a two-position three-way reversing valve, which comprises a first oil port, a second oil port and a third oil port, the first oil port is connected with the hydraulic pump, the third oil port is connected with the hydraulic motor, and the second oil port is connected with the second oil circuit through a third oil circuit. The first reversing valve comprises a first working position and a second working position, and the first working position is a normal working position. In the first working position, the first oil port is communicated with the third oil port, and the second oil port is closed; in the second working position, the first oil port is communicated with the second oil port, and the third oil port is closed.

4. A hydraulic system for silage header or feed-in motor emergency stop according to claim 3, characterized in that, The second reversing valve is a two-position four-way reversing valve, which comprises a fourth oil port, a fifth oil port, a sixth oil port and a seventh oil port, the fourth oil port is connected with the second oil circuit, the fifth oil port is connected with the oil return tank, the sixth oil port is connected with the inlet of the first reversing valve control oil circuit, and the seventh oil port is connected with the outlet of the first reversing valve control oil circuit. The second reversing valve comprises a third working position and a fourth working position, and the third working position is a normal working position. In the first working position, the fourth oil port is connected with the sixth oil port, and the fifth oil port and the seventh oil port are connected; in the second working position, the fourth oil port is connected with the seventh oil port, and the fifth oil port and the sixth oil port are connected.

5. A hydraulic system for silage header or feed-in motor emergency stop according to claim 1, characterized in that, An overflow valve is arranged on the oil circuit.

6. A hydraulic system for silage header or feed-in motor emergency stop according to claim 1, characterized in that, The first reversing valve is an on-off valve.

Images