A gearbox control system and method for a power driven rake

Abstract

The present invention discloses a gearbox control system and method for a power-driven rake, comprising a gearbox, wherein a radial clutch mechanism, an offset detection component, an offset reset mechanism and a control module are arranged inside the gearbox; the offset detection component comprises a plurality of electromagnetic sensors, each electromagnetic sensor collects an offset signal in an electromagnetic field; the offset reset mechanism comprises a rotation drive component and a gear clamping component; an offset analysis unit analyzes each offset amplified signal to obtain an offset distance and an offset angle between an offset point and a worm wheel center; an instruction generation unit generates a clutch switching instruction, a rotation positioning instruction and a reset clamping instruction according to the offset distance and the offset angle; the radial clutch mechanism drives the worm to separate from the worm wheel according to the clutch switching instruction, the rotation drive component drives the gear clamping component to rotate to the offset point according to the rotation positioning instruction, and the gear clamping component clamps the offset point to coincide with the worm wheel center according to the reset clamping instruction. The present invention automatically detects and corrects the offset of the worm wheel in the gearbox.

Description

Technical Field

[0001] The present invention relates to the technical field of gear boxes, and in particular to a gear box control system and method for a power-driven rake. Background Art

[0002] Power-driven harrow refers to a machine that uses the power output shaft of a tractor to drive the working parts through the universal joint drive shaft and the transmission system to perform dry field soil crushing and land preparation operations. The main working parts are a row of vertical shaft rotors, each of which is equipped with two upright harrow teeth. When working, the rotor is driven by the power output shaft through the transmission system, rotating while moving forward, hitting the soil blocks, and loosening the soil in the plough layer. The gearbox is a mechanical device that adjusts the output shaft torque by changing the gear speed. It consists of two or more gears, one of which is driven by a motor. The gearbox can be used in a variety of usage scenarios. The present invention mainly targets the gearbox used to drive agricultural machinery operations. During the farming operation, the gearbox needs to drive the harrow teeth and the sowing mechanism of the power-driven harrow to operate. During the long-term use of the gearbox, the gears on the output shaft will inevitably deviate, and this deviation is difficult to be observed by the maintenance personnel. At the same time, this deviation will cause the gear on the output shaft of the gearbox to be unstable in the connection relationship between the transmission structure of the power-driven harrow and the sowing mechanism, thereby causing jitter, which seriously affects the driving efficiency of the power-driven harrow and the sowing mechanism, and thus affects the efficiency of farming operations. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a gearbox control system and method for a power-driven rake, which is used to automatically detect and correct the offset of the worm gear on the first output shaft of the gearbox to ensure driving efficiency.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a gearbox control system for a power-driven rake, comprising a gearbox, wherein a drive input shaft, a first output shaft, a second output shaft, a radial clutch mechanism, an offset detection component, an offset reset mechanism and a control module are arranged inside the gearbox;

[0005] One end of the drive input shaft passes through the gear box and is connected to an external drive mechanism, and the other end is rotatably disposed inside the gear box, and a first gear is fixedly sleeved on the drive input shaft;

[0006] The first output shaft is parallel to the drive input shaft, the first output shaft is rotatably arranged inside the gear box, a worm gear and a first bevel gear are fixedly sleeved on the first output shaft, the worm gear is meshed with the first gear, the first bevel gear is vertically meshed with a second bevel gear, the second bevel gear is fixedly sleeved on the second output shaft, the second output shaft passes through the gear box and is connected to a power-driven rake;

[0007] A worm is provided in the radial clutch mechanism, the worm is located at the upper end of the worm wheel, the worm passes through the gear box and is connected to a sowing mechanism;

[0008] The offset detection assembly includes a plurality of electromagnetic sensors and a magnetic field generating device, wherein the plurality of electromagnetic sensors are evenly distributed on one side of the worm gear, the magnetic field generating device is used to generate an electromagnetic field on the vertical planes on both sides of the worm gear, and each electromagnetic sensor is used to collect an offset signal of the worm gear rotating in real time in the electromagnetic field;

[0009] The offset reset mechanism includes a rotation drive assembly and a gear pressing assembly, and the rotation drive assembly is fixed to the upper end of the first output shaft;

[0010] The control module is arranged inside the gear box and is electrically connected to the radial clutch mechanism, the electromagnetic sensors and the offset reset mechanism. The control module includes a preprocessing unit, an offset analysis unit and an instruction generation unit. The offset analysis unit is respectively connected to the preprocessing unit and the instruction generation unit.

[0011] The preprocessing unit is used to filter and amplify the plurality of offset signals in sequence to obtain a plurality of corresponding offset amplified signals;

[0012] The offset analysis unit is used to perform a comprehensive analysis on the plurality of offset amplified signals to obtain an offset distance and an offset angle between the offset point on the worm wheel and the worm wheel center at the current moment;

[0013] The instruction generation unit generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction in sequence according to the offset distance and the offset angle;

[0014] The radial clutch mechanism drives the worm to separate from the worm wheel according to the clutch switching instruction, and the rotation drive assembly drives the gear clamping assembly to rotate to the offset point position according to the rotation positioning instruction. The gear clamping assembly is connected to the worm wheel according to the reset clamping instruction, and presses the offset point toward the worm wheel center until the offset point coincides with the worm wheel center.

[0015] Further, the offset analysis unit includes a storage subunit, a waveform comparison subunit and a waveform processing subunit, and the waveform comparison subunit is connected to the storage subunit and the waveform processing subunit respectively;

[0016] The storage subunit pre-stores standard signals collected by each electromagnetic sensor when the worm gear is not offset on the first output shaft;

[0017] The waveform comparison subunit is used to compare and subtract the waveform of each offset amplified signal from the waveform of the corresponding standard signal to obtain a corresponding difference waveform;

[0018] The waveform processing subunit analyzes each of the difference waveforms to obtain the phase and amplitude of each of the difference waveforms, and substitutes each of the amplitudes into a preset first calculation formula to calculate the offset distance between the offset point and the worm wheel center, and then substitutes the offset distance and each of the phases into a preset second calculation formula to obtain the offset angle between the offset point and the worm wheel center.

[0019] Furthermore, the first calculation formula is configured as:

[0020]

[0021]

[0022] Wherein, D is used to represent the offset distance;

[0023] n is used to represent a positive integer greater than 1;

[0024] d is used to represent the distance between each electromagnetic sensor and the worm wheel center;

[0025] l1 to l n Used to indicate the distances between the first to nth electromagnetic sensors and the offset point;

[0026] b1 to b n Used to represent the first to nth preset proportionality coefficients, each of which is a constant;

[0027] A1 to A i Used to indicate the first to nth amplitudes;

[0028] k1 to k n Used to indicate the first to nth configuration coefficients.

[0029] Furthermore, the second calculation formula is configured as:

[0030]

[0031] t i =D*cosa i ;

[0032] Wherein, θ is used to represent the offset angle;

[0033] m is used to represent a positive integer greater than 1;

[0034] a1 to a mUsed to represent the angle between the connecting line of the first to the mth electromagnetic sensor and the offset point and a preset angle standard line;

[0035] t1 to t m Used to represent the phase coefficients of the first to m-th electromagnetic sensors;

[0036] P1 to P m Used to indicate the first to mth phases.

[0037] Furthermore, the radial clutch mechanism includes a swing bracket, a swing block, a rocker arm, a driving cylinder and the worm gear, the swing bracket is perpendicular to the first output shaft, the swing bracket is fixed in the gear box, the swing block is swingably arranged in the swing bracket, one end of the worm gear passes through the swing block and the gear box in sequence to connect the sowing mechanism, and the other end is rotatably arranged in the swing block, the rocker arm is vertically fixed to the side end of the swing block, the piston rod of the driving cylinder is rotatably fixedly connected to the rocker arm, and the end of the driving cylinder away from the piston rod is rotatably fixed to the top inner wall of the gear box.

[0038] Further, the rotary drive assembly includes a mounting frame, a drive motor, a drive disc, a turntable, a fixed shaft, and a third bevel gear, and the gear pressing assembly includes a telescopic fixed frame, a screw rod, a fourth bevel gear, a slider, and a positioning cylinder;

[0039] The mounting frame is fixed on the inner wall of the gear box, the driving motor is horizontally fixed on the mounting frame, the driving disc is fixedly sleeved on the output shaft of the driving motor, the turntable is rotatably arranged on the mounting frame, a synchronous belt is connected between the driving disc and the turntable, a through hole is opened in the center of the turntable, one end of the fixed shaft passes through the through hole and is vertically fixedly connected to the mounting frame, and the other end is fixedly sleeved with the third bevel gear;

[0040] The side end of the telescopic fixing frame is fixedly connected to the side end of the turntable, one end of the screw rod passes through the telescopic fixing frame and is fixedly connected to the wheel center of the fourth bevel gear, and the other end is rotatably arranged in the telescopic fixing frame, the slider is screwed on the screw rod, and the slider is slidably connected in the telescopic fixing frame, the fourth bevel gear is vertically meshed with the third bevel gear, and one side of the worm wheel is evenly provided with a plurality of positioning grooves along the wheel center, the piston rod of the positioning cylinder faces each of the positioning grooves, and the end of the positioning cylinder away from the piston rod is fixedly connected to the slider.

[0041] Further, the preprocessing unit includes a waveform filtering subunit and a signal amplifying subunit;

[0042] The filtering subunit is connected to the signal amplifying subunit, and the waveform filtering subunit is used to filter out clutter in a plurality of the offset signals according to a preset waveform filtering algorithm to obtain a plurality of filtered signals;

[0043] The signal amplification subunit is used to amplify the plurality of filtered signals according to a preset amplification factor to obtain the plurality of offset amplified signals.

[0044] Furthermore, the gear pressing assembly further comprises a flexible sleeve, the flexible sleeve being fixedly sleeved on the piston rod of the positioning cylinder, a plurality of pressure sensors being evenly distributed in the flexible sleeve, the pressure sensors being electrically connected to the control module and used for real-time detection of pressure data between the piston rod of the positioning cylinder and the positioning groove;

[0045] The instruction generation unit includes a pressure calculation subunit, a pressure comparison subunit and a comprehensive processing subunit. The pressure comparison subunit is respectively connected to the pressure calculation subunit and the comprehensive processing subunit. The pressure calculation subunit is used to obtain a pressure average data based on the comprehensive calculation of several pressure sensors. The pressure comparison subunit is used to compare the pressure average data with a preset pressure threshold to obtain a pressure comparison result. The comprehensive processing subunit is used to adjust the reset and clamping instruction according to the pressure comparison result so that the pressure average data is maintained within the pressure range.

[0046] A gearbox control method for a power-driven rake, applied to the above-mentioned gearbox control system for a power-driven rake, comprises:

[0047] Step S1, the magnetic field generating device generates an electromagnetic field on the vertical planes on both sides of the worm gear, and each of the electromagnetic sensors collects the offset signal of the worm gear rotating in real time in the electromagnetic field;

[0048] Step S2, the offset analysis unit performs a comprehensive analysis on the plurality of offset signals to obtain an offset distance and an offset angle between the offset point on the worm wheel and the worm wheel center at the current moment;

[0049] Step S3, the instruction generation unit sequentially generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction according to the offset distance and the offset angle;

[0050] In step S4, the radial clutch mechanism drives the worm to separate from the worm wheel according to the clutch switching instruction, and the rotation drive assembly drives the gear clamping assembly to rotate to the offset point position according to the rotation positioning instruction. The gear clamping assembly is connected to the worm wheel according to the reset clamping instruction, and presses the offset point toward the worm wheel center until the offset point coincides with the worm wheel center.

[0051] Beneficial effects of the present invention:

[0052] The present invention uses a plurality of electromagnetic sensors in an offset detection mechanism to collect offset signals of the worm wheel rotating in an electromagnetic field in real time, and uses an offset analysis unit to perform a comprehensive analysis on the plurality of offset signals to obtain an offset distance and an offset angle between an offset point on the worm wheel and a worm wheel center at the current moment. The position of the offset point can be determined according to the offset distance and the offset angle, thereby realizing automatic detection and positioning of the offset point on the worm wheel; after determining the position of the offset point, the present invention also drives the worm and the worm wheel to separate through a radial clutch mechanism to avoid the offset adjustment process affecting the transmission structure of the sowing mechanism, and enables the rotary drive assembly to drive the gear clamping assembly to rotate to the offset point position to connect the worm wheel, and finally the gear clamping assembly clamps the offset point toward the worm wheel center until the offset point coincides with the worm wheel center, thereby realizing automatic correction and clamping of the offset point on the worm wheel, avoiding the worm wheel on the first output shaft from shaking, and ensuring the stability and efficiency of the drive of the power-driven harrow and the sowing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the internal structure of the gear box in the present invention;

[0054] Figure 2 It is a schematic diagram of the external structure of the gear box in the present invention;

[0055] Figure 3 It is a structural schematic diagram of the offset reset mechanism in the present invention;

[0056] Figure 4 It is a control principle diagram of the gearbox control system in the present invention;

[0057] Figure 5 It is a flow chart of the gearbox control steps in the present invention.

[0058] Figure numerals: 1, gear box; 2, drive input shaft; 21, first gear; 3, first output shaft; 31, worm gear; 32, first bevel gear; 4, radial clutch mechanism; 41, worm; 42, swing bracket; 43, swing block; 44, drive cylinder; 45, swing rod; 5, offset detection assembly; 51, electromagnetic sensor; 52, magnetic field generating device; 6, offset reset mechanism; 61, mounting frame; 63, drive disk; 64, turntable; 65, fixed shaft; 66, third bevel gear; 67, telescopic fixing frame; 6 8. Screw rod; 69. Fourth bevel gear; 610. Slider; 611. Positioning cylinder; 7. Control module; 71. Pre-processing unit; 711. Waveform filtering subunit; 712. Signal amplification subunit; 72. Offset analysis unit; 721. Storage subunit; 722. Waveform analysis subunit; 723. Waveform processing subunit; 73. Instruction generation unit; 731. Pressure calculation subunit; 732. Pressure comparison subunit; 733. Comprehensive processing subunit; 8. Second output shaft; 81. Second bevel gear. DETAILED DESCRIPTION

[0059] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0060] like Figures 1 to 3 As shown, a gearbox control system for a power-driven rake of this embodiment includes a gearbox 1, wherein a drive input shaft 2, a first output shaft 3, a second output shaft 8, a radial clutch mechanism 4, an offset detection component 5, an offset reset mechanism 6 and a control module 7 are provided inside the gearbox 1;

[0061] One end of the drive input shaft 2 passes through the gear box 1 and is connected to an external drive mechanism, and the other end is rotatably arranged inside the gear box 1. A first gear 21 is fixedly sleeved on the drive input shaft 2;

[0062] The first output shaft 3 is parallel to the drive input shaft 2, and the first output shaft 3 is rotatably arranged inside the gear box 1. A worm gear 31 and a first bevel gear 32 are fixedly sleeved on the first output shaft 3. The worm gear 31 is meshed with the first gear 21. The first bevel gear 32 is vertically meshed with a second bevel gear 81. The second bevel gear 81 is fixedly sleeved on the second output shaft 8. The second output shaft 8 passes through the gear box 1 and is connected to the power drive rake.

[0063] A worm 41 is provided in the radial clutch mechanism 4. The worm 41 is located at the upper end of the worm wheel 31. The worm 41 passes through the gear box 1 and is connected to a sowing mechanism.

[0064] The offset detection component 5 includes a plurality of electromagnetic sensors 51 and a magnetic field generating device 52. The plurality of electromagnetic sensors 51 are evenly distributed on one side of the worm gear 31. The magnetic field generating device 52 is used to generate an electromagnetic field on the vertical planes on both sides of the worm gear 31. Each electromagnetic sensor 51 is used to collect an offset signal of the worm gear 31 in real time when the worm gear 31 rotates in the electromagnetic field.

[0065] The offset reset mechanism 6 includes a rotation drive assembly and a gear pressing assembly, and the rotation drive assembly is fixed to the upper end of the first output shaft 3;

[0066] The control module 7 is arranged inside the gear box 1 and is electrically connected to the radial clutch mechanism 4, a plurality of electromagnetic sensors 51 and the offset reset mechanism 6. Figure 4 As shown, the control module 7 includes a preprocessing unit 71, an offset analysis unit 72 and an instruction generation unit 73, and the offset analysis unit 72 is connected to the preprocessing unit 71 and the instruction generation unit 73 respectively;

[0067] The preprocessing unit 71 is used to filter and amplify the plurality of offset signals in sequence to obtain a plurality of corresponding offset amplified signals;

[0068] The offset analysis unit 72 is used to perform comprehensive analysis on a number of offset amplified signals to obtain an offset distance and an offset angle between an offset point on the worm wheel 31 and the wheel center of the worm wheel 31 at the current moment;

[0069] The instruction generation unit 73 generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction in sequence according to the offset distance and the offset angle;

[0070] The radial clutch mechanism 4 drives the worm 41 to separate from the worm wheel 31 according to the clutch switching instruction, and the rotation drive assembly drives the gear clamping assembly to rotate to the offset point position according to the rotation positioning instruction. The gear clamping assembly is connected to the worm wheel 31 according to the reset clamping instruction, and presses the offset point toward the center of the worm wheel 31 until the offset point coincides with the center of the worm wheel 31.

[0071] Specifically, in this embodiment, the external driving mechanism can be a DC motor, which drives the driving input shaft 2 to rotate, and then drives the first gear 21 to rotate, the first gear 21 drives the worm gear 31 to rotate, the worm gear 31 drives the first output shaft 3 and the first bevel gear 32 to rotate, the first bevel gear 32 drives the second bevel gear 81 to rotate, and the second bevel gear 81 drives the second output shaft 8 to rotate, thereby driving the power-driven harrow; when the worm 41 in the radial clutch mechanism 4 is engaged with the worm gear 31, the worm gear 31 drives the worm 41 to rotate, and the worm 41 drives the sowing mechanism to operate.

[0072] In this embodiment, the electromagnetic sensor 51 can be a Hall element, and the model of the Hall element can be YS43F. The control module 7 can be a control circuit board, and a single-chip microcomputer chip is integrated on the control circuit board. The model of the single-chip microcomputer chip can be MC35P7040. When the gearbox 1 is in operation, a number of Hall elements arranged on the side of the worm gear 31 detect in real time to obtain a number of offset signals, and each offset signal is used to characterize the offset between the position point where the Hall element is arranged on the side of the worm gear 31 and the wheel center of the worm gear 31. Each Hall element sends a number of offset signals to the single-chip microcomputer chip. First, the preprocessing unit 71 in the single-chip microcomputer chip performs signal preprocessing on each offset signal to obtain a number of offset amplified signals. Then the offset analysis unit 72 in the single-chip microcomputer chip performs a comprehensive analysis on each offset amplified signal to generate an offset distance and an offset angle, and then the instruction generation unit 73 in the single-chip microcomputer chip generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction in sequence according to the offset distance and the offset angle, and sends the clutch switching instruction to the radial clutch mechanism 4, sends the rotation positioning instruction to the rotation drive component, and sends the reset pressing instruction to the gear pressing component. The radial clutch mechanism 4 drives the worm 41 away from the worm wheel 31 according to the clutch switching instruction, so as to avoid the offset adjustment process affecting the transmission structure of the sowing mechanism. The rotation drive component drives the gear pressing component to rotate to the offset point position to connect the worm wheel 31 according to the rotation positioning instruction, and finally the gear pressing component presses the offset point toward the wheel center of the worm wheel 31 according to the reset pressing instruction until the offset point coincides with the wheel center of the worm wheel 31, thereby realizing the automatic correction and pressing of the offset point on the worm wheel 31, avoiding the shaking of the worm wheel 31 on the first output shaft 3, and ensuring the stability and efficiency of the driving of the power-driven harrow and the sowing mechanism. When the offset angle and the offset distance are both 0, it indicates that the offset point coincides with the center of the worm wheel 31. At this time, the automatic correction and tightening of the offset point on the worm wheel 31 is completed. The instruction correction unit generates a reset meshing instruction and sends it to the radial clutch mechanism 4. The radial clutch mechanism 4 drives the worm 41 to mesh with the worm wheel 31 according to the reset meshing instruction. At this time, the gear box 1 can drive the sowing mechanism and the power-driven harrow at the same time.

[0073] Preferably, the radial clutch mechanism 4 includes a swing bracket 42, a swing block 43, a rocker arm 45, a driving cylinder 44 and a worm 41. The swing bracket 42 is perpendicular to the first output shaft 3, the swing bracket 42 is fixed in the gear box 1, the swing block 43 is swingably arranged in the swing bracket 42, one end of the worm 41 passes through the swing block 43 and the gear box 1 in sequence to connect the sowing mechanism, and the other end is rotatably arranged in the swing block 43, the rocker arm 45 is vertically fixed to the side end of the swing block 43, the piston rod of the driving cylinder 44 is rotatably fixedly connected to the rocker arm 45, and the end of the driving cylinder 44 away from the piston rod is rotatably fixed to the top inner wall of the gear box 1.

[0074] Specifically, in this embodiment, when the driving cylinder 44 receives the clutch switching instruction, the driving cylinder 44 drives the piston rod to contract, driving the swing rod 45 to swing in the direction away from the worm gear 31, thereby driving the swing block 43 and the internal worm 41 away from the worm gear 31, so as to achieve the separation between the worm 41 and the worm gear 31. When the driving cylinder 44 receives the reset engagement instruction, the driving cylinder 44 drives the piston rod to push outward, driving the swing rod 45 to swing in the direction close to the worm gear 31, thereby driving the swing block 43 and the internal worm 41 to approach the worm gear 31, until the worm 41 is engaged with the worm gear 31.

[0075] Preferably, the offset analysis unit 72 includes a storage subunit 721, a waveform comparison subunit and a waveform processing subunit 723, and the waveform comparison subunit is connected to the storage subunit 721 and the waveform processing subunit 723 respectively;

[0076] The storage subunit 721 pre-stores standard signals collected by each electromagnetic sensor 51 when the worm gear 31 is not offset on the first output shaft 3;

[0077] The waveform comparison subunit is used to compare and subtract the waveform of each offset amplified signal with the waveform of the corresponding standard signal to obtain a corresponding difference waveform;

[0078] The waveform processing subunit 723 analyzes each difference waveform to obtain the phase and amplitude of each difference waveform, and substitutes each amplitude into a preset first calculation formula to calculate the offset distance between the offset point and the center of the worm gear 31, and then substitutes the offset distance and each phase into a preset second calculation formula to obtain the offset angle between the offset point and the center of the worm gear 31.

[0079] Specifically, in this embodiment, the waveform comparison subunit obtains the waveform of each offset amplified signal, and subtracts the waveform of each offset amplified signal from the standard waveform collected by the same electromagnetic sensor 51 to obtain a difference waveform. The waveform processing subunit 723 performs waveform analysis on each difference waveform to obtain the phase and amplitude of each difference waveform, and then substitutes the amplitude into the first calculation formula to obtain the offset distance between the offset point and the center of the worm gear 31. Then, the phase and the calculated offset distance are substituted into the second calculation formula to obtain the offset angle between the offset point and the center of the worm gear 31. The position of the offset point on the worm gear 31 can be determined based on the offset angle and the offset distance.

[0080] Preferably, the first calculation formula is configured as:

[0081]

[0082]

[0083] Where D is used to represent the offset distance;

[0084] n is used to represent a positive integer greater than 1;

[0085] d is used to indicate the distance between each electromagnetic sensor and the worm wheel center;

[0086] l1 to l n Used to indicate the distance between the first to nth electromagnetic sensors and the offset point;

[0087] b1 to b n Used to represent the first to nth preset proportional coefficients, each proportional coefficient is a constant;

[0088] A1 to A i Used to indicate the first to nth amplitudes;

[0089] k1 to k n Used to indicate the first to nth configuration coefficients.

[0090] Specifically, in this embodiment, four electromagnetic sensors 51 are provided, and then four configuration coefficients are provided, and four proportional coefficients are provided, and each configuration coefficient is different from each other, and each proportional coefficient is different from each other.

[0091] Preferably, the second calculation formula is configured as:

[0092]

[0093] t i =D*cosa i ;

[0094] Among them, θ is used to represent the offset angle;

[0095] m is used to represent a positive integer greater than 1;

[0096] a1 to a m Used to represent the angle between the line connecting the first to the mth electromagnetic sensor and the offset point and the preset angle standard line;

[0097] t1 to t m Used to represent the phase coefficients of the first to mth electromagnetic sensors;

[0098] P1 to P m Used to indicate the first to mth phases.

[0099] Preferably, the rotary drive assembly includes a mounting frame 61, a drive motor (not shown in the figure), a drive disk 63, a rotating disk 64, a fixed shaft 65, and a third bevel gear 66, and the gear pressing assembly includes a telescopic fixed frame 67, a screw rod 68, a fourth bevel gear 69, a slider 610, and a positioning cylinder 611;

[0100] The mounting frame 61 is fixed on the inner wall of the gear box 1, the driving motor is horizontally fixed on the mounting frame 61, the driving disc 63 is fixedly sleeved on the output shaft of the driving motor, the rotating disc 64 is rotatably arranged on the mounting frame 61, a synchronous belt is connected between the driving disc 63 and the rotating disc 64, a through hole is opened in the center of the rotating disc 64, one end of the fixed shaft 65 passes through the through hole and is vertically fixedly connected to the mounting frame 61, and the other end is fixedly sleeved with a third bevel gear 66;

[0101] The side end of the telescopic fixing frame 67 is fixedly connected to the side end of the turntable 64, one end of the screw rod 68 passes through the telescopic fixing frame 67 and is fixedly connected to the wheel center of the fourth bevel gear 69, and the other end is rotatably arranged in the telescopic fixing frame 67, the slider 610 is screwed on the screw rod 68, the slider 610 is slidably connected in the telescopic fixing frame 67, the fourth bevel gear 69 is vertically meshed with the third bevel gear 66, and a plurality of positioning grooves are evenly opened on one side of the worm gear 31 along the wheel center, the piston rod of the positioning cylinder 611 faces each positioning groove, and the end of the positioning cylinder 611 away from the piston rod is fixedly connected to the slider 610.

[0102] Specifically, in the present embodiment, the driving drive disk 63 of the driving motor rotates, and the turntable 64 is driven to rotate through the synchronous belt, and the turntable 64 drives the telescopic fixed frame 67 to rotate. During the rotation of the telescopic fixed frame 67, the third bevel gear 66 is fixed, and the fourth bevel gear 69 rotates along the third bevel gear 66 while maintaining its own rotation. The fourth bevel gear 69 drives the screw rod 68 to rotate, and the screw rod 68 drives the slider 610 to slide toward the fourth bevel gear 69. At this time, the positioning cylinder 611 slides toward the fourth bevel gear 69. When sliding to the positioning groove position, the piston rod of the positioning cylinder 611 extends into the positioning groove closest to the positioning point, thereby realizing the connection between the gear clamping assembly and the worm gear 31.

[0103] Preferably, the preprocessing unit 71 includes a waveform filtering subunit 711 and a signal amplifying subunit 712;

[0104] The filtering subunit is connected to the signal amplifying subunit 712, and the waveform filtering subunit 711 is used to filter out clutter in a number of offset signals according to a preset waveform filtering algorithm to obtain a number of filtered signals;

[0105] The signal amplification subunit 712 is used to amplify a plurality of filtered signals according to a preset amplification factor to obtain a plurality of offset amplified signals.

[0106] Specifically, in this embodiment, the waveform filtering subunit 711 filters the clutter in the offset signal according to the amplitude limiting and de-jittering filtering method, thereby eliminating the jitter in the waveform, improving the waveform stability, and reducing the subsequent unnecessary calculation amount. The signal amplification subunit 712 amplifies the waveform of the filtered signal to facilitate subsequent observation and calculation.

[0107] Preferably, the gear pressing assembly further comprises a flexible sleeve, which is fixedly sleeved on the piston rod of the positioning cylinder 611, and a plurality of pressure sensors are evenly distributed in the flexible sleeve, which is electrically connected to the control module 7 and is used to detect the pressure data between the piston rod of the positioning cylinder 611 and the positioning groove in real time;

[0108] The instruction generation unit 73 includes a pressure calculation subunit 731, a pressure comparison subunit 732 and a comprehensive processing subunit 733. The pressure comparison subunit 732 is respectively connected to the pressure calculation subunit 731 and the comprehensive processing subunit 733. The pressure calculation subunit 731 is used to obtain a pressure average data based on a comprehensive calculation of a number of pressure sensors. The pressure comparison subunit 732 is used to compare the pressure average data with a preset pressure threshold to obtain a pressure comparison result. The comprehensive processing subunit 733 is used to adjust the reset and clamping instruction according to the pressure comparison result to maintain the pressure average data within the pressure range.

[0109] Specifically, in this embodiment, when the piston rod of the positioning cylinder 611 offsets and presses the positioning groove in the worm gear 31, the positioning groove will apply pressure to the flexible sleeve outside the piston rod, and the pressure data between various locations on the piston rod of the positioning cylinder 611 and the positioning groove are detected by a plurality of pressure sensors. The pressure calculation subunit 731 calculates the pressure mean data based on the plurality of pressure data to characterize the degree of compression of the piston rod of the positioning cylinder 611 on the worm gear 31. When the pressure mean data is not within the pressure range, a first pressure comparison result is generated, and the comprehensive processing subunit 733 adjusts the reset and clamping instruction based on the first pressure comparison result to reduce the pressure of the piston rod of the positioning cylinder 611 on the positioning groove to avoid deformation and damage of the piston rod of the positioning cylinder 611 due to excessive pressure. When the pressure mean data is within the pressure range, a second pressure comparison result is generated, and the comprehensive processing subunit 733 maintains the reset and clamping instruction based on the second pressure comparison result to maintain the pressure of the piston rod of the positioning cylinder 611 on the positioning groove.

[0110] A gearbox control method for a power-driven rake is applied to the above-mentioned gearbox control system for a power-driven rake, such as Figure 5 As shown, including:

[0111] Step S1, the magnetic field generating device 52 generates an electromagnetic field on the vertical planes on both sides of the worm gear 31, and each electromagnetic sensor 51 collects the offset signal of the worm gear 31 rotating in real time in the electromagnetic field;

[0112] Step S2, the offset analysis unit 72 performs a comprehensive analysis on a plurality of offset signals to obtain an offset distance and an offset angle between an offset point on the worm wheel 31 and the wheel center of the worm wheel 31 at the current moment;

[0113] Step S3, the instruction generation unit 73 generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction in sequence according to the offset distance and the offset angle;

[0114] In step S4, the radial clutch mechanism 4 drives the worm 41 to separate from the worm wheel 31 according to the clutch switching instruction, and the rotation drive assembly drives the gear clamping assembly to rotate to the offset point position according to the rotation positioning instruction. The gear clamping assembly is connected to the worm wheel 31 according to the reset clamping instruction, and presses the offset point toward the center of the worm wheel 31 until the offset point coincides with the center of the worm wheel 31.

[0115] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A gearbox control system for a power driven rake, characterized in that: The invention comprises a gear box (1), wherein a drive input shaft (2), a first output shaft (3), a second output shaft (8), a radial clutch mechanism (4), an offset detection component (5), an offset reset mechanism (6) and a control module (7) are arranged inside the gear box (1); One end of the drive input shaft (2) passes through the gear box (1) and is connected to an external drive mechanism, and the other end is rotatably arranged inside the gear box (1); a first gear (21) is fixedly sleeved on the drive input shaft (2); The first output shaft (3) is parallel to the drive input shaft (2), and the first output shaft (3) is rotatably arranged inside the gear box (1). A worm gear (31) and a first bevel gear (32) are fixedly sleeved on the first output shaft (3), the worm gear (31) is meshed with the first gear (21), the first bevel gear (32) is vertically meshed with a second bevel gear (81), the second bevel gear (81) is fixedly sleeved on the second output shaft (8), and the second output shaft (8) passes through the gear box (1) and is connected to a power drive rake; A worm (41) is provided in the radial clutch mechanism (4), the worm (41) is located at the upper end of the worm wheel (31), and the worm (41) passes through the gear box (1) and is connected to a sowing mechanism; The offset detection component (5) comprises a plurality of electromagnetic sensors (51) and a magnetic field generating device (52), wherein the plurality of electromagnetic sensors (51) are evenly distributed on a side surface of the worm gear (31), the magnetic field generating device (52) is used to generate an electromagnetic field on vertical surfaces on both sides of the worm gear (31), and each electromagnetic sensor (51) is used to collect an offset signal of the worm gear (31) in real time when the worm gear (31) rotates in the electromagnetic field; The offset reset mechanism (6) comprises a rotation drive assembly and a gear pressing assembly; The rotary drive assembly comprises a mounting frame (61), a drive motor, a drive disk (63), a rotating disk (64), a fixed shaft (65), and a third bevel gear (66); the gear pressing assembly comprises a telescopic fixed frame (67), a screw rod (68), a fourth bevel gear (69), a sliding block (610), and a positioning cylinder (611); The mounting frame (61) is fixed on the inner side wall of the gear box (1), the driving motor is horizontally fixed on the mounting frame (61), the driving disc (63) is fixedly sleeved on the output shaft of the driving motor, the rotating disc (64) is rotatably arranged on the mounting frame (61), a synchronous belt is connected between the driving disc (63) and the rotating disc (64), a through hole is opened at the center of the rotating disc (64), one end of the fixed shaft (65) passes through the through hole and is vertically fixedly connected to the mounting frame (61), and the other end is fixedly sleeved with the third bevel gear (66); The side end of the telescopic fixing frame (67) is fixedly connected to the side end of the rotating disk (64); one end of the screw rod (68) passes through the telescopic fixing frame (67) and is fixedly connected to the wheel center of the fourth bevel gear (69); the other end is rotatably arranged in the telescopic fixing frame (67); the slider (610) is screwed on the screw rod (68); the slider (610) is slidably connected in the telescopic fixing frame (67); the fourth bevel gear (69) is vertically meshed with the third bevel gear (66); a plurality of positioning grooves are evenly opened on one side of the worm wheel (31) along the wheel center; the piston rod of the positioning cylinder (611) faces each of the positioning grooves; and the end of the positioning cylinder (611) away from the piston rod is fixedly connected to the slider (610); The gear pressing assembly also includes a flexible sleeve, which is fixedly sleeved on the piston rod of the positioning cylinder (611); The control module (7) is arranged inside the gear box (1) and is electrically connected to the radial clutch mechanism (4), the plurality of electromagnetic sensors (51) and the offset reset mechanism (6); the control module (7) comprises a preprocessing unit (71), an offset analysis unit (72) and an instruction generation unit (73); the offset analysis unit (72) is respectively connected to the preprocessing unit (71) and the instruction generation unit (73); The preprocessing unit (71) is used to filter and amplify the plurality of offset signals in sequence to obtain a plurality of corresponding offset amplified signals; The offset analysis unit (72) is used to perform a comprehensive analysis on a plurality of the offset amplified signals to obtain an offset distance and an offset angle between an offset point on the worm wheel (31) and a wheel center of the worm wheel (31) at a current moment; The instruction generation unit (73) generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction in sequence according to the offset distance and the offset angle; The radial clutch mechanism (4) drives the worm (41) to separate from the worm wheel (31) according to the clutch switching instruction, and the rotation drive assembly drives the gear pressing assembly to rotate to the offset point position according to the rotation positioning instruction. The gear pressing assembly is connected to the worm wheel (31) according to the reset pressing instruction, and presses the offset point toward the wheel center of the worm wheel (31) until the offset point coincides with the wheel center of the worm wheel (31).

2. The gearbox control system for a power driven rake according to claim 1, characterized in that: The offset analysis unit (72) comprises a storage subunit (721), a waveform comparison subunit and a waveform processing subunit (723), wherein the waveform comparison subunit is connected to the storage subunit (721) and the waveform processing subunit (723) respectively; The storage subunit (721) pre-stores standard signals collected by each electromagnetic sensor (51) when the worm gear (31) is not offset on the first output shaft (3); The waveform comparison subunit is used to compare and subtract the waveform of each offset amplified signal from the waveform of the corresponding standard signal to obtain a corresponding difference waveform; The waveform processing subunit (723) analyzes each of the difference waveforms to obtain the phase and amplitude of each of the difference waveforms, and substitutes each of the amplitudes into a preset first calculation formula to calculate the offset distance between the offset point and the wheel center of the worm gear (31), and then substitutes the offset distance and each of the phases into a preset second calculation formula to obtain the offset angle between the offset point and the wheel center of the worm gear (31).

3. The gearbox control system for a power driven rake according to claim 2, characterized in that: The first calculation formula is configured as: Wherein, D is used to represent the offset distance; n is used to represent a positive integer greater than 1; d is used to represent the distance between each electromagnetic sensor and the worm wheel center; l1 to l n Used to indicate the distances between the first to nth electromagnetic sensors and the offset point; b1 to b n Used to represent the first to nth preset proportionality coefficients, each of which is a constant; A1 to A i Used to indicate the first to nth amplitudes; k1 to k n Used to indicate the first to nth configuration coefficients.

4. The gearbox control system for a power driven rake according to claim 2, characterized in that: The second calculation formula is configured as: t i =D*what i ; Wherein, θ is used to represent the offset angle; m is used to represent a positive integer greater than 1; a1 to a m Used to represent the angle between the connecting line of the first to the mth electromagnetic sensor and the offset point and a preset angle standard line; t1 to t m Used to represent the phase coefficients of the first to m-th electromagnetic sensors; P1 to P m Used to indicate the first to mth phases.

5. The gearbox control system for a power driven rake according to claim 1, characterized in that: The radial clutch mechanism (4) comprises a swing bracket (42), a swing block (43), a swing rod (45), a driving cylinder (44) and the worm (41); the swing bracket (42) and the first output shaft (3) are perpendicular to each other; the swing bracket (42) is fixed in the gear box (1); the swing block (43) is swingably arranged in the swing bracket (42); one end of the worm (41) passes through the swing block (43) and the gear box (1) in sequence to connect the sowing mechanism; the other end is rotatably arranged in the swing block (43); the swing rod (45) is vertically fixed to the side end of the swing block (43); the piston rod of the driving cylinder (44) is rotatably fixedly connected to the swing rod (45); and the end of the driving cylinder (44) away from the piston rod is rotatably fixed to the top inner wall of the gear box (1).

6. The gearbox control system for a power driven rake according to claim 1, characterized in that: The preprocessing unit (71) comprises a waveform filtering subunit (711) and a signal amplifying subunit (712); The filtering subunit is connected to the signal amplifying subunit (712), and the waveform filtering subunit (711) is used to filter out clutter in a plurality of the offset signals according to a preset waveform filtering algorithm to obtain a plurality of filtered signals; The signal amplification subunit (712) is used to amplify the plurality of filtered signals according to a preset amplification factor to obtain the plurality of offset amplified signals.

7. The gearbox control system for a power driven rake according to claim 1, characterized in that: A plurality of pressure sensors are evenly distributed in the flexible sleeve, the pressure sensors are electrically connected to the control module (7) and are used to detect pressure data between the piston rod of the positioning cylinder (611) and the positioning groove in real time; The instruction generation unit (73) includes a pressure calculation subunit (731), a pressure comparison subunit (732) and a comprehensive processing subunit (733); the pressure comparison subunit (732) is respectively connected to the pressure calculation subunit (731) and the comprehensive processing subunit (733); the pressure calculation subunit (731) is used to obtain a pressure average data based on a comprehensive calculation of a plurality of pressure sensors; the pressure comparison subunit (732) is used to compare the pressure average data with a preset pressure range to obtain a pressure comparison result; and the comprehensive processing subunit (733) is used to adjust the reset and clamping instruction according to the pressure comparison result so that the pressure average data is maintained within the pressure range.

8. A gearbox control method for a power-driven rake, applied to the gearbox control system for a power-driven rake as claimed in any one of claims 1 to 7, characterized in that: include: Step S1, the magnetic field generating device (52) generates an electromagnetic field on the vertical planes on both sides of the worm gear (31), and each of the electromagnetic sensors (51) collects the offset signal of the worm gear (31) rotating in real time in the electromagnetic field; Step S2, the offset analysis unit (72) performs a comprehensive analysis on a plurality of the offset signals to obtain an offset distance and an offset angle between an offset point on the worm wheel (31) and a wheel center of the worm wheel (31) at a current moment; Step S3, the instruction generation unit (73) sequentially generates a clutch switching instruction, a rotation positioning instruction and a reset pressing instruction according to the offset distance and the offset angle; Step S4, the radial clutch mechanism (4) drives the worm (41) to separate from the worm wheel (31) according to the clutch switching instruction, the rotation drive assembly drives the gear clamping assembly to rotate to the offset point position according to the rotation positioning instruction, the gear clamping assembly is connected to the worm wheel (31) according to the reset clamping instruction, and presses the offset point toward the wheel center of the worm wheel (31) until the offset point coincides with the wheel center of the worm wheel (31).

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