Segment length hydraulic system and sugarcane harvester

Abstract

The utility model discloses a cut length hydraulic system and sugarcane harvester, cut length hydraulic system includes oil pumping unit, regulating motor and shunt device, and regulating motor is equipped with delivery motor or cut motor, and the synchronous motor of shunt device accepts the oil liquid from oil pumping unit, and the oil inlet of regulating motor is connected with first synchronous oil outlet, and the shunt inlet of shunt reversing valve is connected with second synchronous oil outlet, and the oil inlet of regulating motor is connected with the first shunt oil outlet of shunt reversing valve, and second shunt oil outlet is connected back to oil pumping unit, and the shunt inlet is connected with one of first shunt oil outlet and second shunt oil outlet in shunt reversing valve, and compared with change cut knife number, and simple operation, high efficiency, cancel the proportional speed regulating valve, adopt synchronous motor shunt, played the role of reducing energy waste and reducing the heat output of hydraulic control system.

Description

Technical Field

[0001] This utility model belongs to the technical field of sugarcane harvesters, and particularly relates to a hydraulic system for cutting length and a sugarcane harvester. Background Technology

[0002] Sugarcane is one of the world's major economic crops, and after harvesting, it is sent to sugar mills for sugar extraction. Sugarcane harvesting methods include manual harvesting and mechanical harvesting. With the development of technology and the increase in labor costs, mechanical harvesting is becoming increasingly prevalent. Among them, the sugarcane cutting machine can complete the cutting, segmenting, and impurity removal of sugarcane in one operation, resulting in high harvesting efficiency. It is the most widely used sugarcane harvester globally.

[0003] The length of sugarcane segments is a crucial indicator of harvesting quality in sugarcane harvesters. Segments that are too short will result in increased sugar loss, while segments that are too long will negatively impact the sugar mill's sugar-refining process and the efficiency of sugarcane transport. Furthermore, the required segment length varies depending on the type and intended use of sugarcane. In a sugarcane harvester, conveyor rollers transport the sugarcane upwards, while cutting rollers cut it into segments of a specific length. The segment length of a sugarcane harvester is primarily related to the rotational speed of the conveyor rollers, the rotational speed of the cutting rollers, and the number of cutting blades on each cutting roller. In existing technologies, the cutting length is often changed by altering the rotational speed of the cutting roller or the number of cutting blades on each cutting roller. However, changing the number of cutting blades on each cutting roller requires replacing the cutting roller, resulting in complex operation and low efficiency. Changing the rotational speed of the cutting roller affects the impurity removal effect of the product. Furthermore, a proportional speed control valve is often used to control the flow rate into the cutting motor, thereby changing the rotational speed of the cutting roller. However, some high-pressure oil flows directly back to the oil tank through the proportional speed control valve. The large pressure difference between the inlet and outlet of the proportional speed control valve leads to energy waste and increased heat generation in the hydraulic system. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides a hydraulic system for cutting length and a sugarcane harvester, aiming to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the first aspect of this utility model provides a hydraulic system for slicing length, wherein the hydraulic system for slicing length includes an oil pumping device, an regulating motor, and a flow diversion device; the regulating motor is one of a conveying motor and a slicing motor; the flow diversion device includes a synchronous motor and a flow diversion directional valve, the synchronous motor's synchronous inlet receives oil from the oil pumping device, the synchronous motor has a first synchronous outlet and a second synchronous outlet, the first synchronous outlet is connected to the inlet of the regulating motor, the flow diversion directional valve's flow diversion inlet is connected to the second synchronous outlet, the first flow diversion outlet of the flow diversion directional valve is connected to the inlet of the regulating motor, and the second flow diversion outlet is connected back to the oil pumping device, and the flow diversion directional valve is used to select one of the first flow diversion outlet and the second flow diversion outlet to connect to the flow diversion inlet.

[0006] In one embodiment of this utility model, the regulating motor is configured as a conveying motor. The first working oil port of the conveying motor is connected to the first synchronous oil outlet and the first diverting oil outlet respectively. The second working oil port of the conveying motor is connected back to the pumping device. A segmenting motor is provided between the pumping device and the diverting device. The third working oil port of the segmenting motor is connected to the pumping device, and the fourth working oil port is connected to the synchronous oil inlet of the synchronous motor.

[0007] In one embodiment of this utility model, the number of the second synchronous oil outlet of the synchronous motor and the number of the diversion valves are both at least two. The diversion oil inlets of the at least two diversion valves are respectively connected to the at least two second synchronous oil outlets in a one-to-one correspondence. The first diversion oil outlets of the at least two diversion valves are all connected to the first working oil port, and the second diversion oil outlets are all connected back to the pumping device.

[0008] In one embodiment of this utility model, the flow rates of at least two second synchronous oil outlets are set to be different.

[0009] In one embodiment of this utility model, the oil pumping device is configured to form an open circulation oil circuit and includes an oil tank, an oil pump, an overflow valve, and a main directional valve. The oil pump is used to guide the oil in the oil tank to the reversing inlet of the main directional valve. The first reversing outlet and the second reversing outlet of the main directional valve are respectively connected to the third working port and the second working port in a one-to-one correspondence. The reversing return port of the main directional valve is connected back to the oil tank. The main directional valve is used to select one of the first reversing outlet and the second reversing outlet to connect to the reversing inlet, and the other to connect to the reversing return port. The overflow valve is connected between the reversing inlet and the reversing return port.

[0010] In one embodiment of this utility model, the main directional valve is configured as a three-position four-way solenoid directional valve with an H-type neutral position function.

[0011] In one embodiment of this utility model, the oil pumping device is configured to form a closed-loop oil circuit and includes an oil tank, an oil pump, a replenishing oil pump, and a replenishing oil check valve. The first and second pressure ports of the oil pump are respectively connected to the third and second working oil ports in a one-to-one correspondence. The replenishing oil pump is connected to the oil tank and replenishes oil to the low-pressure side of the closed-loop oil circuit through the replenishing oil check valve.

[0012] In one embodiment of the present invention, the cutting motor is configured to include an upper cutting roller motor and a lower cutting roller motor, which are connected in parallel between the oil pumping device and the diverting device, and the rotors of the upper cutting roller motor and the lower cutting roller motor are fixedly connected.

[0013] In one embodiment of this utility model, the conveying motor is configured to include a left conveying roller motor and a right conveying roller motor, which are connected in parallel between the diverting device and the oil pumping device. There are multiple left conveying roller motors and multiple right conveying roller motors, which are connected in series.

[0014] In one embodiment of this utility model, the diversion valve is configured as a two-position three-way solenoid valve.

[0015] In one embodiment of this utility model, an opening and closing control valve may be provided between the first synchronous oil outlet and the oil inlet of the regulating motor.

[0016] To achieve the above objectives, a second aspect of this utility model provides a sugarcane harvester, wherein the sugarcane harvester includes a hydraulic system for cutting lengths as described above.

[0017] Through the above technical solution, the hydraulic system for cutting length provided by this utility model has the following beneficial effects: When the sugarcane harvester uses the aforementioned hydraulic system for cutting length, it includes an oil pump, an adjusting motor, and a diverting device. The adjusting motor is either the conveying motor or the cutting motor. The cutting length is adjusted by controlling the flow rate of either the conveying or cutting motor, thereby changing the rotational speed of the conveying or cutting rollers. For longer cutting lengths, the diverting valve can be switched to connect the first diverting oil outlet to the diverting oil inlet, allowing the first and second synchronous oil outlets to merge and supply oil to the adjusting motor. For shorter cutting lengths... In the case of length, the controllable diversion valve can be switched to connect the second diversion oil outlet to the diversion oil inlet, so that only the first synchronous oil outlet supplies oil to the regulating motor. This makes the operation simple and efficient compared to changing the number of cutting blades. At the same time, the proportional speed control valve is eliminated, and the synchronous motor is used for diversion. The torque balance characteristics of the synchronous motor itself do not generate too much energy loss and heat, which reduces energy waste and reduces the heat generation of the hydraulic control system. Furthermore, when the regulating motor is set as a conveying motor, it can also avoid affecting the impurity removal effect of the product.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of a first embodiment of the hydraulic system for cutting length according to the present invention; Figure 2 This is another structural schematic diagram of the hydraulic system for cutting length according to the first embodiment of the present invention; Figure 3 This is yet another structural schematic diagram of the hydraulic system for cutting length according to the first embodiment of the present invention; Figure 4 This is a structural schematic diagram of the second embodiment of the hydraulic system for cutting length according to the present invention.

[0020] Explanation of reference numerals in the attached figures: 100. Oil pump device; 110. Oil tank; 120. Oil pump; 130. Overflow valve; 140. Main directional valve; 150. Make-up oil pump; 160. Make-up oil check valve; 200. Cutting motor; 210. Upper cutting roller motor; 220. Lower cutting roller motor; 300. Conveyor motor; 310. Left conveyor roller motor; 320. Right conveyor roller motor; 400. Synchronous motor; 500. Diverter directional valve; P. Diverter inlet; A. First diverter outlet; B. Second diverter outlet. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] The hydraulic system for cutting length and the sugarcane harvester of this utility model are described below with reference to the accompanying drawings.

[0023] like Figures 1 to 4 As shown, this utility model provides a hydraulic system for cutting length, wherein the hydraulic system for cutting length includes: Oil pump unit 100; Adjust the motor to be either the conveyor motor 300 or the cutting motor 200; The diversion device includes a synchronous motor 400 and a diversion directional valve 500. The synchronous motor 400 receives oil from the oil pumping device 100 at its synchronous inlet. The synchronous motor 400 has a first synchronous outlet and a second synchronous outlet. The first synchronous outlet is connected to the inlet of the regulating motor. The diversion inlet P of the diversion directional valve 500 is connected to the second synchronous outlet. The first diversion outlet A of the diversion directional valve 500 is connected to the inlet of the regulating motor, and the second diversion outlet B is connected back to the oil pumping device 100. The diversion directional valve 500 is used to select one of the first diversion outlet A and the second diversion outlet B to be connected to the diversion inlet P.

[0024] When the sugarcane harvester uses the aforementioned hydraulic system for cutting length, it includes an oil pumping device 100, an adjusting motor, and a diverting device. The adjusting motor is either a conveying motor 300 or a cutting motor 200. That is, by controlling the flow rate of the conveying motor 300 or the cutting motor 200, the rotational speed of the conveying roller or the cutting roller is changed accordingly to adjust the cutting length. When a larger cutting length is required, the diverting valve 500 can be switched to connect the first diverting oil outlet A with the diverting oil inlet P, so that the first synchronous oil outlet and the second synchronous oil outlet merge to supply oil to the adjusting motor. When a smaller cutting length is required... When the cutting length is specified, the diversion valve 500 can be switched to connect the second diversion oil outlet B to the diversion oil inlet P, so that only the first synchronous oil outlet supplies oil to the regulating motor. This makes the operation simpler and more efficient compared to changing the number of cutting blades. It also eliminates the need for a proportional speed control valve, using a synchronous motor 400 for diversion. The torque balance characteristics of the synchronous motor 400 itself prevent excessive energy loss and heat generation, reducing energy waste and the heat generated by the hydraulic control system. Furthermore, when the regulating motor is set as the conveyor motor 300, it avoids affecting the impurity removal effect on the product. It should be noted that the cutting length hydraulic system provided by this utility model is particularly suitable for sugarcane harvesters, but is not limited to them. If other products use the cutting length hydraulic system provided by this utility model, they should fall within the protection scope of this utility model.

[0025] Specifically, the diversion valve 500 can be configured as a two-position three-way solenoid directional valve. When it is necessary to control the merging of the first and second synchronous oil outlets to supply oil to the regulating motor, the diversion valve 500 can be switched to a de-energized state by the control device. In the de-energized state, the first diversion outlet A of the diversion valve 500 is connected to the diversion inlet P, and the second diversion outlet B is closed. When it is necessary to control only the first synchronous oil outlet to supply oil to the regulating motor, the diversion valve 500 can be switched to an energized state by the control device. In the energized state, the first diversion outlet A of the diversion valve 500 is closed, and the second diversion outlet B is connected to the diversion inlet P. Of course, this utility model is not limited to this; the structures of the diversion valve 500 in the de-energized and energized states can also be interchanged. In addition, the diverting valve 500 can be configured as a two-position three-way solenoid directional valve, or as a two-position four-way solenoid directional valve. By blocking one of the holes, it can be used as a two-position three-way solenoid directional valve. Alternatively, it can be configured to achieve the switching function through a combination of an electric actuator and a mechanical valve, or it can be configured as a manual directional valve.

[0026] More specifically, the cutting length hydraulic system also includes a gear selection module. This module is signal-connected to the control device and used to issue a cutting length gear command, enabling the control device to control the diversion valve 500 according to the cutting length gear command issued by the gear selection module. The gear selection module can be a display screen module, showing at least two touch-sensitive positions for touch selection. Alternatively, it can be a mechanical button module or a knob module, with at least two gear control positions. Of course, this invention is not limited to these; the cutting length hydraulic system can also control the diversion valve 500 according to the input of a desired cutting length range.

[0027] In one embodiment of this invention, an on / off control valve may be provided between the first synchronous oil outlet and the oil inlet of the regulating motor. By adding the on / off control valve, it is possible to control whether the first synchronous oil outlet is selected to supply oil to the oil inlet of the regulating motor, adapting to different working conditions. For example, in some working conditions where only cutting is required and no conveying is not necessary, the regulating motor is configured as a conveying motor 300, and the cutting motor 200 is located before the diversion device. In this case, the on / off control valve can be closed, and the diversion reversing valve 500 can be switched to connect the second diversion oil outlet B to the diversion oil inlet P, thus completely cutting off the oil supply to the conveying motor 300. Of course, this invention is not limited to this; a direct connection between the first synchronous oil outlet and the oil inlet of the regulating motor is also possible.

[0028] In one embodiment of this utility model, the regulating motor is a conveying motor 300. The first working oil port of the conveying motor 300 is connected to the first synchronous oil outlet and the first diverting oil outlet A, respectively. The second working oil port of the conveying motor 300 is connected back to the pumping device 100. A cutting motor 200 is provided between the pumping device 100 and the diverting device. The third working oil port of the cutting motor 200 is connected to the pumping device 100, and the fourth working oil port is connected to the synchronous oil inlet of the synchronous motor 400. That is, the conveying motor 300 is selected as the regulating motor to avoid affecting the impurity removal effect of the product. At the same time, the cutting motor 200 and the conveying motor 300 are connected in series and share a pumping device 100, so that the speed of the cutting motor 200 remains constant when the total flow rate of the system remains unchanged. By changing the speed of the conveying motor 300, the cutting length can be controlled. On the one hand, the number of components is reduced, making the overall system layout more compact. On the other hand, the cutting motor 200 and the conveying motor 300 belong to the same hydraulic control circuit, and the ratio of their input flow rates is constant and controllable, allowing for more precise control of the cutting length. Of course, this invention is not limited to this; it is also possible for the cutting motor 200 and the conveying motor 300 to have separate oil pumping devices 100.

[0029] In one embodiment of this utility model, the number of second synchronous oil outlets of the synchronous motor 400 and the number of diversion valves 500 are both at least two. The diversion inlets P of the at least two diversion valves 500 are respectively connected to the at least two second synchronous oil outlets of the synchronous motor 400. The first diversion outlets A of the at least two diversion valves 500 are all connected to the first working oil port of the conveying motor 300, and the second diversion outlets B are all connected back to the pumping device 100. By increasing the number of second synchronous oil outlets of the synchronous motor 400 and diversion valves 500, the number of selectable cutting lengths can be increased to ensure that various cutting length requirements are met.

[0030] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the number of the second synchronous oil outlet of the synchronous motor 400 and the number of the diversion valve 500 can both be two. The diversion oil inlet P of the two diversion valves 500 are respectively connected to the two second synchronous oil outlets of the synchronous motor 400. The first diversion oil outlet A of the two diversion valves 500 are both connected to the first working oil port of the conveying motor 300, and the second diversion oil outlet B are both connected back to the pumping device 100. This increases the cutting length by a medium amount between the maximum and minimum. Furthermore, by switching both diversion valves 500 to connect the first diversion outlet A to the diversion inlet P, the maximum cutting length can be achieved; by switching both diversion valves 500 to connect the second diversion outlet B to the diversion inlet P, two options for the minimum cutting length can be achieved; by switching one diversion valve 500 to connect the first diversion outlet A to the diversion inlet P, and the other diversion valve 500 to connect the second diversion outlet B to the diversion inlet P, a medium cutting length can be achieved. When the number of the second synchronous outlet of the synchronous motor 400 and the diversion valves 500 is greater than two, there are more options for the cutting length.

[0031] Of course, this utility model is not limited to this; see also Figure 3 It is also possible to have only one second synchronous oil outlet of the synchronous motor 400 and one diversion valve 500, in which case there are only two cutting length options. Specifically, the maximum cutting length can be achieved by switching the single diversion valve 500 to connect the first diversion oil outlet A to the diversion oil inlet P; the minimum cutting length can be achieved by switching the single diversion valve 500 to connect the second diversion oil outlet B to the diversion oil inlet P.

[0032] See Figures 1 to 3In the first embodiment of this utility model, the oil pumping device 100 is configured to form an open circulation oil circuit and includes an oil tank 110, an oil pump 120, an overflow valve 130, and a main directional valve 140. The oil pump 120 is used to guide the oil in the oil tank 110 to the reversing inlet of the main directional valve 140. The first reversing outlet and the second reversing outlet of the main directional valve 140 are respectively connected to the third working port and the second working port. The reversing return port of the main directional valve 140 is connected back to the oil tank 110. The main directional valve 140 is used to select one of the first reversing outlet and the second reversing outlet to be connected to the reversing inlet, and the other to be connected to the reversing return port. The overflow valve 130 is connected between the reversing inlet and the reversing return port. The oil pump 120 of the oil pumping device 100 draws oil from the oil tank 110, and the oil flows back to the oil tank 110 after passing through the segmented motor 200, the diverter, and the conveying motor 300 in sequence. The structure is relatively simple and the heat dissipation effect is good. At the same time, the main reversing valve 140 can adjust the running direction of the segmented motor 200 to achieve segmentation when the segmented motor 200 rotates forward, and to achieve unblocking when the segmented motor 200 rotates in reverse.

[0033] Specifically, the main directional valve 140 can be configured as a three-position four-way solenoid directional valve with an H-type neutral position function. When the main directional valve 140 is de-energized, the valve core is in the neutral position. When the first solenoid of the main directional valve 140 is energized, the valve core is in the left position, and the main directional valve 140 connects the first reversing outlet to the reversing inlet and the second reversing outlet to the reversing return port, causing the cutting motor 200 to rotate forward. When the second solenoid of the main directional valve 140 is energized, the valve core is in the right position, and the main directional valve 140 connects the second reversing outlet to the reversing inlet and the first reversing outlet to the reversing return port, causing the cutting motor 200 to rotate in reverse. Of course, this invention is not limited to this. Besides being configured as a solenoid directional valve, the main directional valve 140 can also achieve the reversing function through a combination of an electric actuator and a mechanical valve. Of course, it can also be configured as a manual directional valve.

[0034] See Figure 4In the second embodiment of this utility model, the oil pumping device 100 is configured to form a closed-loop oil circuit and includes an oil tank 110, an oil pump 120, a replenishing oil pump 150, and a replenishing oil check valve 160. The first and second pressure ports of the oil pump 120 are respectively connected to the third and second working oil ports. The replenishing oil pump 150 is connected to the oil tank 110 and replenishes oil to the low-pressure side of the closed-loop oil circuit through the replenishing oil check valve 160. That is, the oil can circulate in the closed-loop oil circuit without frequent replenishment. Compared with the open system, this system reduces leakage and external pollution, and improves transmission efficiency. At the same time, the addition of the replenishing oil pump 150 and the replenishing oil check valve 160 allows for replenishment of oil to the low-pressure side, ensuring that the oil volume inside the system remains stable. Specifically, the size of the oil tank 110 in the second embodiment can be set to be smaller than that in the first embodiment, and the oil pump 120 in the second embodiment can be configured as a bidirectional variable pump.

[0035] like Figures 2 to 4 As shown, in one embodiment of this utility model, the cutting motor 200 includes an upper cutting roller motor 210 and a lower cutting roller motor 220. The upper cutting roller motor 210 and the lower cutting roller motor 220 are connected in parallel between the oil pumping device 100 and the diverting device, and the rotors of the upper cutting roller motor 210 and the lower cutting roller motor 220 are fixedly connected. This allows the upper and lower cutting rollers to be arranged sequentially from top to bottom, each equipped with a cutting blade. The sugarcane can be cut between the upper and lower cutting rollers by the cutting blades of both rollers. The upper cutting roller motor 210 and the lower cutting roller motor 220 are simultaneously driven by the same oil pumping device 100. Furthermore, the fixed connection of the rotors of the upper cutting roller motor 210 and the lower cutting roller motor 220 ensures that their rotational speeds remain consistent. Of course, this utility model is not limited to this. It is also possible for the cutting motor 200 to only have an upper cutting roller motor 210 or a lower cutting roller motor 220, that is, the upper cutting roller motor 210 and the lower cutting roller motor 220 are driven separately.

[0036] Please see again Figures 1 to 4 In one embodiment of this utility model, the conveying motor 300 includes a left conveying roller motor 310 and a right conveying roller motor 320. The left and right conveying roller motors 310 and 320 are connected in parallel between the diverting device and the oil pumping device 100. There are multiple left and right conveying roller motors 310 and 320, all connected in series. That is, the left and right conveying roller motors 310 and 320 are simultaneously driven by the same oil pumping device 100. Specifically, the rotors of the left and right conveying roller motors 310 and 320, located at the front end of the conveying direction, are fixedly connected, thereby ensuring that their rotational speeds remain consistent.

[0037] In one embodiment of this utility model, the flow rates of at least two second synchronous oil outlets of the synchronous motor 400 are set to be different, thereby providing more options for the cutting length.

[0038] Specifically, taking a synchronous motor 400 with two second synchronous oil outlets and different flow rates as an example, the following explanation is provided: When the first segment length is required, both diversion valves 500 are switched to connect the second diversion oil outlet B to the diversion oil inlet P. When the second segment length is required, the diversion valve 500 corresponding to the second synchronous oil outlet with the larger flow rate is switched to connect the second diversion oil outlet B to the diversion oil inlet P, and the remaining diversion valves 500 are switched to connect the first diversion oil outlet A to the diversion oil inlet P. When the third segment length is required, the second synchronous oil outlet with the smaller flow rate is switched... The diversion valve 500 is switched to connect the second diversion outlet B with the diversion inlet P, and the remaining diversion valves 500 are switched to connect the first diversion outlet A with the diversion inlet P. When a fourth segment length is required, all diversion valves 500 are switched to connect the first diversion outlet A with the diversion inlet P, thus obtaining the first, second, third, and fourth segment lengths in ascending order, and allowing selection of the desired segment length from these four options. This invention provides four positions corresponding to the four segment lengths described above.

[0039] Of course, this utility model is not limited to this. It is also possible for the synchronous motor 400 to have a second synchronous oil outlet with the same flow rate. No such limitation is made here.

[0040] In one embodiment of this utility model, the flow rates of all synchronous oil outlets of the synchronous motor 400 are set to be different. That is, in addition to setting the flow rates of the second synchronous oil outlets to be different, the number of the first synchronous oil outlets and the second synchronous oil outlets can also be set to be different.

[0041] In one embodiment of this utility model, the flow rate ratio of the first synchronous oil outlet of the synchronous motor 400 is set to be determined based on the minimum cutting length of the sugarcane harvester, and / or, the total displacement of the synchronous motor 400 is set to be determined based on the maximum cutting length of the sugarcane harvester, thereby facilitating the design and selection of the synchronous motor 400 according to design requirements. Specifically, the total flow rate of the system and the displacement of the cutting motor 200 can also be set to be determined based on the maximum cutting length of the sugarcane harvester.

[0042] Specifically, with Figure 1 For example, Figure 1When the oil pump device provided is operating normally, the flow rate entering the segment motor is the output flow rate of the oil pump. The formula for calculating the speed of the segment motor is: n M1 =Q P / V M1 ×η M1 ; In the formula, n M1 This is expressed as the rotational speed of the segmented motor; Q P V represents the output flow rate of the oil pump. M1 This is expressed as the displacement of the segmented motor; η p1 This is expressed as the volumetric efficiency of the segmented motor.

[0043] The formula for calculating the speed of the conveyor motor is: n M2 =Q M2 / V M2 ×η M2 ; In the formula, n M2 This is expressed as the rotational speed of the conveyor motor; Q M2 V represents the input flow rate of the conveyor motor. M2 This is expressed as the displacement of the conveyor motor; η p2 This is expressed as the volumetric efficiency of the conveyor motor.

[0044] Meanwhile, the ratios of the flow rates at the first synchronous oil outlet and the two second synchronous oil outlets of the synchronous motor to the total flow rate are a1, a2, and a3, respectively, with a2 being less than a3. The flow rate Q entering the conveyor motor is... m2 It is related to the state of the diversion valve.

[0045] The cutting length of the sugarcane machine depends on the linear velocity of the sugarcane conveyor (directly proportional to the speed of the conveyor motor) and the cutting interval time (inversely proportional to the speed of the cutting motor). Therefore, the formula for calculating the theoretical cutting length in this embodiment is as follows: L=g×n M2 / n M1 =g×(Q M2 / Q P )×V M1 ×η M2 / (V) M2 ×η p1 ); In the formula, L represents the theoretical segment length; g represents the segment length coefficient, which is a fixed value when the structural dimensions do not change; n M1 This is expressed as the rotational speed of the segmented motor; Q P V represents the output flow rate of the oil pump. M1 This is expressed as the displacement of the segmented motor; η p1 This is expressed as the volumetric efficiency of the segmented motor; n M2This is expressed as the rotational speed of the conveyor motor; Q M2 V represents the input flow rate of the conveyor motor. M2 This is expressed as the displacement of the conveyor motor; η p2 This is expressed as the volumetric efficiency of the conveyor motor.

[0046] In the above formula, g and V M1 η M2 V M2 η p1 Since all values ​​are fixed, we can assume f = g × V M1 ×η M2 / (V) M2 ×η p1 That is, f is a fixed value.

[0047] Due to Q M2 / Q P ≤1, f is the maximum segment length, L=f×(Q) M2 / Q P That is, the segment length is only related to Q. M2 With Q P It is related to the ratio. In this embodiment, the two diversion valves have the following four possible combinations.

[0048] 1) When both diverter valves are in the right position, Q m2 = (a1 + a2 + a3) × Q P = Q P Q M2 / Q P =1, L=f; 2) When the ratio of the flow rate of the two second synchronous oil outlets to the total flow rate is smaller and the corresponding diversion valve is in the right position, and the ratio of the flow rate of the larger and the corresponding diversion valve is in the left position, Q m2 = (a1 + a2) × Q P Q M2 / Q P = a1+ a2, L=f×(a1+ a2); 3) When the ratio of the flow rate of the two second synchronous oil outlets to the total flow rate is larger, the corresponding diversion valve is in the right position, and the corresponding diversion valve is smaller, the corresponding diversion valve is in the left position, Q m2 = (a1 + a3) × Q P Q M2 / Q P = a1+ a3, L=f×(a1+ a3); 4) When both diverter valves are in the left position, Q m2 =a1×Q P Q M2 / QP = a1, L=f×a1; Therefore, by rationally designing the flow ratio of each oil outlet of the synchronous motor, the requirement for adjusting the cutting length can be met.

[0049] Furthermore, this utility model also provides a sugarcane harvester, which includes a hydraulic system based on the cutting length described above. Since the sugarcane harvester adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0050] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cut-to-length hydraulic system, characterized by, include: Oil pump unit (100); Adjust the motor to be either the conveying motor (300) or the cutting motor (200); The flow divider includes a synchronous motor (400) and a flow divider valve (500). The synchronous motor (400) receives oil from the oil pumping device (100) at its synchronous inlet. The synchronous motor (400) has a first synchronous outlet and a second synchronous outlet. The first synchronous outlet is connected to the inlet of the regulating motor. The flow divider valve (500) has a flow divider inlet (P) connected to the second synchronous outlet. The flow divider valve (500) has a first flow divider outlet (A) connected to the inlet of the regulating motor and a second flow divider outlet (B) connected back to the oil pumping device (100). The flow divider valve (500) is used to select one of the first flow divider outlet (A) and the second flow divider outlet (B) to connect to the flow divider inlet (P).

2. The cut length hydraulic system of claim 1, wherein, The regulating motor is configured as a conveying motor (300). The first working oil port of the conveying motor (300) is connected to the first synchronous oil outlet and the first diverting oil outlet (A) respectively. The second working oil port of the conveying motor (300) is connected back to the pumping device (100). A segmenting motor (200) is provided between the pumping device (100) and the diverting device. The third working oil port of the segmenting motor (200) is connected to the pumping device (100), and the fourth working oil port is connected to the synchronous oil inlet of the synchronous motor (400).

3. The cut length hydraulic system of claim 2, wherein, The number of the second synchronous oil outlet of the synchronous motor (400) and the number of the diversion valve (500) are both at least two. The diversion inlet (P) of the at least two diversion valves (500) is connected to the at least two second synchronous oil outlets in a one-to-one correspondence. The first diversion outlet (A) of the at least two diversion valves (500) is connected to the first working oil port, and the second diversion outlet (B) is connected back to the oil pumping device (100).

4. The cut length hydraulic system of claim 3, wherein, The flow rates of at least two of the second synchronous oil outlets are set to be different.

5. The cut length hydraulic system of claim 2, wherein, The oil pump device (100) is configured to form an open circulation oil circuit and includes an oil tank (110), an oil pump (120), an overflow valve (130), and a main directional valve (140). The oil pump (120) is used to guide the oil in the oil tank (110) to the reversing inlet of the main directional valve (140). The first reversing outlet and the second reversing outlet of the main directional valve (140) are respectively connected to the third working port and the second working port. The reversing return port of the main directional valve (140) is connected back to the oil tank (110). The main directional valve (140) is used to select one of the first reversing outlet and the second reversing outlet to connect to the reversing inlet, and the other to connect to the reversing return port. The overflow valve (130) is connected between the reversing inlet and the reversing return port.

6. The cut length hydraulic system of claim 5, wherein, The main directional valve (140) is configured as a three-position four-way solenoid directional valve with a neutral position function of type H.

7. The cut length hydraulic system of claim 2, wherein, The oil pump device (100) is configured to form a closed-loop oil circuit and includes an oil tank (110), an oil pump (120), a replenishing oil pump (150), and a replenishing oil check valve (160). The first and second pressure ports of the oil pump (120) are respectively connected to the third working oil port and the second working oil port. The replenishing oil pump (150) is connected to the oil tank (110) and replenishes oil to the low-pressure side of the closed-loop oil circuit through the replenishing oil check valve (160).

8. The cut length hydraulic system of claim 2, wherein, The segmented motor (200) is configured to include an upper segmented roller motor (210) and a lower segmented roller motor (220), the upper segmented roller motor (210) and the lower segmented roller motor (220) are connected in parallel between the oil pump device (100) and the flow divider device, and the rotors of the upper segmented roller motor (210) and the lower segmented roller motor (220) are fixedly connected; And / or, the conveying motor (300) is configured to include a left conveying roller motor (310) and a right conveying roller motor (320), the left conveying roller motor (310) and the right conveying roller motor (320) being connected in parallel between the diversion device and the oil pumping device (100), and the number of the left conveying roller motor (310) and the right conveying roller motor (320) being multiple, and the multiple left conveying roller motors (310) and the multiple right conveying roller motors (320) being connected in series.

9. The cut length hydraulic system of any of claims 1-8, wherein, The diversion valve (500) is configured as a two-position three-way solenoid directional valve; And / or, an opening and closing control valve is provided between the first synchronous oil outlet and the oil inlet of the regulating motor.

10. A sugar cane harvester characterised by, The sugarcane harvester includes a hydraulic system for cutting length according to any one of claims 1 to 9.

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