Sowing depth limiting wheel ground pressure measurement calibration device and method

Abstract

The present application relates to the technical field of agricultural seeding, and provides a device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair and a method for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair. The device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair comprises: a pair of depth-limiting wheels connected to a machine body; a pressure adjusting member arranged on the machine body and used for adjusting the ground pressure of the depth-limiting wheels; a pressure sensor arranged on the machine body and used for detecting the actual pressure output by the pressure adjusting member; and a pressure acquisition calibrator used for detecting the ground pressure applied by the depth-limiting wheels to the ground and for automatically fitting a plurality of actual pressures and a plurality of ground pressures to establish a ground pressure measurement model of the depth-limiting wheels. The device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair can automatically acquire a plurality of actual pressures and a plurality of ground pressures, and then establish a ground pressure measurement model of the depth-limiting wheels, thereby avoiding the problems of low efficiency and poor accuracy caused by manual recording and manual fitting.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural seeding technology, and in particular to a device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair and a method for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair. BACKGROUND

[0002] The current no-tillage seeder mainly adopts the structure of a pair of depth-limiting wheels symmetrically arranged on both sides of the furrow opener to reduce the influence of furrow profiling on the consistency of the seeding depth. The ground pressure of the seeding depth-limiting wheel pair is a key indicator for evaluating the seeding quality and directly affects the tightness of the soil particle arrangement in the seed furrow. Related research shows that the ground pressure of the seeding depth-limiting wheel pair is closely related to the soil firmness, and appropriate soil firmness is conducive to water storage and soil conservation of the seedbed and promotes seedling emergence and soil breaking. Precise measurement of the ground pressure of the depth-limiting wheel pair helps to improve the accuracy of the ground pressure control of the seeding unit, thereby achieving reasonable control of the seedbed firmness and maximizing the seeding quality and promoting crop yield.

[0003] Generally, a pressure sensor is used to collect the ground pressure of the seeding unit. Due to different structures of different seeding units, the size of the pressure sensor varies, resulting in changes in the ground pressure measurement model of the depth-limiting wheel pair. The existing method mainly adopts manual recording and manual fitting to complete the calibration of the corresponding sensor and the construction of the pressure measurement model, which is labor-intensive, time-consuming, and lacks effective automation devices, and is difficult to meet the needs of rapid calibration and accurate modeling of the ground pressure measurement sensor of the depth-limiting wheel pair in the batch production mode. SUMMARY

[0004] The present application provides a device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair and a method for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair to solve the problem that the existing manual recording and manual fitting calibration method cannot meet the needs of rapid calibration and accurate modeling of the ground pressure of the depth-limiting wheel pair in the batch production mode.

[0005] The present application provides a device for measuring and calibrating the ground pressure of a seeding depth-limiting wheel pair, comprising: a machine body connected to a pair of depth-limiting wheels; a pressure adjusting member arranged on the machine body for adjusting the ground pressure of the depth-limiting wheels; a pressure sensor arranged on the machine body for detecting the actual pressure output by the pressure adjusting member; and a pressure collection calibrator arranged below the depth-limiting wheels and in abutment with the depth-limiting wheels, the pressure collection calibrator being used for detecting the ground pressure of the depth-limiting wheels applied to the ground, and the pressure collection calibrator being used for adjusting the actual pressure output by the pressure adjusting member; wherein the pressure collection calibrator is electrically connected to the pressure sensor, and the pressure collection calibrator is further used for storing a plurality of actual pressures and a plurality of ground pressures, and establishing a depth-limiting wheel ground pressure measurement model after automatic fitting.

[0006] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the pressure collection calibrator comprises a load sensor for detecting the ground pressure applied by the depth wheel to the ground; a processor electrically connected with the load sensor and the pressure sensor, the processor being used for adjusting the actual pressure output by the pressure adjusting part, and the processor being used for storing a plurality of actual pressures and a plurality of ground pressures to establish a depth wheel ground pressure measurement model after automatic fitting.

[0007] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the processor comprises a signal amplification circuit, an A / D acquisition module and a single-chip microcomputer which are electrically connected in sequence, and the signal amplification circuit is electrically connected with the load sensor.

[0008] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the device further comprises a profiled four-bar linkage which is hingedly connected with the machine body, one end of the pressure adjusting part is connected with the machine body, and the other end of the pressure adjusting part is hingedly connected with the profiled four-bar linkage; and a levelness detector which is arranged on the profiled four-bar linkage and is used for detecting the inclination angle between the profiled four-bar linkage and a horizontal plane.

[0009] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the device further comprises a lifting mechanism which is arranged between the depth wheel and the pressure collection calibrator, and the lifting mechanism is used for adjusting the inclination angle between the profiled four-bar linkage and a horizontal plane.

[0010] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the lifting mechanism comprises a load-bearing plate which is located below the depth wheel and abuts against the depth wheel; a pair of slide rails which are located below the load-bearing plate; a pair of X-shaped supports, the first end of each X-shaped support is connected with the load-bearing plate, and the second end of each X-shaped support is connected with a sliding block which is in sliding connection with the slide rail; and a pair of oil cylinders, the first end of each oil cylinder is connected with one sliding block, and the second end of each oil cylinder is connected with one X-shaped support, so as to adjust the inclination angle between the load-bearing plate and a horizontal plane.

[0011] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the device further comprises an opener which is connected with the machine body, and the opener is located between the pair of depth wheels.

[0012] According to the seeding depth wheel ground pressure measurement calibration device provided by the application, the load-bearing plate is provided with a hollow groove, and part of the opener extends to the lower side of the load-bearing plate through the hollow groove, so that the opener is in a suspended state.

[0013] The application further provides a method for measuring and calibrating the ground pressure of a seeding depth limiting wheel pair by using the seeding depth limiting wheel pair ground pressure measuring and calibrating device, comprising: adjusting the actual pressure output by the pressure adjusting member at a preset time interval; obtaining a plurality of the actual pressures of the pressure adjusting member and a plurality of the ground pressures applied to the ground by the depth limiting wheel; storing the plurality of the actual pressures and the plurality of the ground pressures in an array form and performing data fitting to establish a depth limiting wheel ground pressure measuring model.

[0014] According to the method for measuring and calibrating the ground pressure of a seeding depth limiting wheel pair provided by the application, before the step of adjusting the actual pressure output by the pressure adjusting member at a preset time interval, the method further comprises: controlling the lifting mechanism to act so that the inclination angle between the profiled four-bar linkage and the horizontal plane is 0°.

[0015] The seeding depth limiting wheel pair ground pressure measuring and calibrating device provided by the application can automatically obtain a plurality of actual pressures and a plurality of ground pressures by setting the pressure adjusting member, the pressure sensor and the pressure acquisition calibrator, and then establish a depth limiting wheel ground pressure measuring model, thereby avoiding the problems of high labor intensity, long time consumption, low efficiency and poor accuracy caused by manual recording and manual fitting. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is the front view of the seeding depth limiting wheel pair ground pressure measuring and calibrating device provided by the application;

[0018] Figure 2 is the side view of the seeding depth limiting wheel pair ground pressure measuring and calibrating device provided by the application;

[0019] Figure 3 is Figure 1 is one of the structure schematic diagrams of the lifting mechanism shown in the application;

[0020] Figure 4 is the second structure schematic diagram of the lifting mechanism;

[0021] Figure 5 is Figure 3 is the structure schematic diagram of the load-bearing plate shown in the application;

[0022] Figure 6 is Figure 1A front view of the fixing member shown in FIG. 1;

[0023] Figure 7 is Figure 1 A top view of the fixing member shown in FIG. 1;

[0024] Reference signs:

[0025] 10: pressure adjusting member; 20: depth limiting wheel; 30: fixing member; 40: pressure acquisition calibrator; 41: display screen; 50: lifting mechanism; 51: bearing plate; 52: X-shaped support; 53: sliding rail; 54: oil cylinder; 55: hydraulic pump; 56: sliding block; 60: profiled four-bar linkage; 70: levelness detector; 80: furrow opener; 100: machine body; 501: motor; 502: first lead screw; 503: commutator; 504: second lead screw; 511: hollowed-out groove. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] The present application will be described below in conjunction with Figures 1-7 The present application describes a seeding depth limiting wheel pair ground pressure measurement calibration device and a method for calibrating the ground pressure measurement of the seeding depth limiting wheel pair.

[0029] As Figure 1 and Figure 2As shown, in the embodiment of the present application, the sowing depth limiting wheel ground pressure measurement calibration device comprises a machine body 100, a pressure adjusting part 10, a depth limiting wheel 20, a pressure sensor and a pressure collection calibrator 40. The depth limiting wheel 20 is connected with the machine body 100, the pressure adjusting part 10 is arranged on the machine body 100, and the pressure adjusting part 10 is used for adjusting the ground pressure of the depth limiting wheel 20. The pressure sensor is arranged on the machine body 100, and the pressure sensor is used for detecting the actual pressure output by the pressure adjusting part 10. The pressure collection calibrator 40 is arranged below the depth limiting wheel 20 and abuts against the depth limiting wheel 20, and the pressure collection calibrator 40 is electrically connected with the pressure sensor. The pressure collection calibrator 40 is used for adjusting the actual pressure output by the pressure adjusting part 10, the pressure collection calibrator 40 is also used for detecting the ground pressure applied to the ground by the depth limiting wheel 20, and the pressure collection calibrator 40 is also used for storing a plurality of actual pressures and a plurality of ground pressures, and establishing a depth limiting wheel ground pressure measurement model after automatic fitting.

[0030] Specifically, the pressure adjusting part 10 is arranged on the machine body 100, the pressure collection calibrator 40 is used for adjusting the actual pressure output by the pressure adjusting part 10, specifically, the pressure collection calibrator 40 can adjust the actual pressure output by the pressure adjusting part 10 at a preset interval time, the actual pressure output by the pressure adjusting part 10 is transmitted to the depth limiting wheel 20, the depth limiting wheel 20 transmits the pressure to the ground, and the actual pressure output by the pressure adjusting part 10 can adjust the ground pressure applied to the ground by the depth limiting wheel 20, so as to ensure that the furrow opener can reach the appropriate furrowing depth in different soil hardness environments. In the embodiment, the pressure sensor is used for collecting the actual pressure output by the pressure adjusting part 10, and sending the collected data to the pressure collection calibrator 40. The pressure collection calibrator 40 is arranged below the depth limiting wheel 20, and a weighing sensor is arranged in the pressure collection calibrator 40, and the weighing sensor is used for detecting the ground pressure applied to the ground by the depth limiting wheel 20. The pressure collection calibrator 40 stores a plurality of actual pressures and a plurality of ground pressures, and defines the plurality of actual pressures and the plurality of ground pressures as two groups of arrays, establishes a pressure sensor calibration equation through data fitting by the least square method, and displays the key parameters in the fitting equation in real time, and then obtains a depth limiting wheel ground pressure measurement model.

[0031] Optionally, in the embodiment of the present application, the pressure adjusting part 10 can be an electric push rod, a pneumatic spring, a hydraulic oil cylinder or an electromagnetic damper.

[0032] It should be noted that, in the embodiment, the electrical connection can be wired connection or wireless communication connection.

[0033] The sowing depth limiting wheel ground pressure measurement calibration device provided by the embodiment of the application can automatically obtain multiple actual pressures and multiple ground pressures, and then establish a depth limiting wheel ground pressure measurement model, thereby avoiding the problems of high labor intensity, long time consumption, low efficiency and poor accuracy caused by manual recording and manual fitting.

[0034] Further, in the embodiment of the application, the pressure acquisition calibrator 40 comprises a load cell and a processor. The load cell is used to detect the ground pressure of the depth limiting wheel 20 applied to the ground. The processor is electrically connected with the load cell and the pressure sensor, and the processor is used to adjust the actual pressure output by the pressure adjusting part 10. The processor is also used to store multiple actual pressures and multiple ground pressures, and to automatically fit to establish a depth limiting wheel ground pressure measurement model.

[0035] Specifically, the processor comprises a signal amplifier, an A / D acquisition module and a single-chip microcomputer. The load cell can collect the ground pressure of the depth limiting wheel 20 in real time at a certain frequency. The load cell detects and collects the ground pressure of the depth limiting wheel 20 by using the strain gauge force measurement principle. The ground pressure data is transmitted to the single-chip microcomputer after gain processing by the amplification circuit and conversion by the A / D acquisition module. The single-chip microcomputer collects the feedback value of the pressure sensor and the ground pressure of the depth limiting wheel in real time by changing the actual pressure output by the pressure adjusting part 10. Then, the single-chip microcomputer automatically fits according to multiple actual pressures and multiple ground pressures, establishes a pressure sensor calibration equation, and displays the key parameters in the fitting equation in real time, thereby obtaining a depth limiting wheel ground pressure measurement model, and greatly improving the accuracy and use convenience of the depth limiting wheel ground pressure measurement model.

[0036] Further, the pressure acquisition calibrator 40 is also provided with a display screen 41, which is used to display the actual pressure, the ground pressure, the key parameters of the calibration equation and the like.

[0037] As shown in Figure 1 In the embodiment of the application, the sowing depth limiting wheel ground pressure measurement calibration device further comprises a profiled four-bar linkage 60 and a levelness detector 70. The profiled four-bar linkage 60 is hinged to the machine body 100. One end of the pressure adjusting part 10 is connected with the machine body 100, and the other end of the pressure adjusting part 10 is hinged to the profiled four-bar linkage 60. The levelness detector 70 is arranged on the profiled four-bar linkage 60, and the levelness detector 70 is used to detect the inclination angle between the profiled four-bar linkage 60 and the horizontal plane.

[0038] Specifically, the contouring four-link 60 is located above the depth-limiting wheel 20. The contouring four-link 60 includes a pair of upper arms and a pair of lower arms. The levelness detector 70 can be set on the upper or lower arms of the contouring four-link 60 to detect whether there is any tilt between the contouring four-link 60 and the horizontal plane. In this embodiment, the levelness detector 70 is fixed to the upper arm of the contouring four-link 60 to detect the tilt angle between the upper arm and the horizontal plane. When the upper arm tilts between the upper arm and the horizontal plane, the position of the contouring four-link 60 should be adjusted so that the angle between the contouring four-link 60 and the horizontal plane is 0°, so as to avoid the pressure output by the pressure regulating component 10 being decomposed during the transmission to the depth-limiting wheel 20, thereby affecting the measurement accuracy of the pressure acquisition calibrator 40.

[0039] Optionally, in this embodiment, the levelness detector 70 can be an angle sensor, a tilt sensor, or a level, etc.

[0040] like Figure 1 As shown, in an embodiment of the present invention, the ground pressure measurement and calibration device of the seeding depth limiting wheel further includes a lifting mechanism 50. The lifting mechanism 50 is disposed between the depth limiting wheel 20 and the pressure acquisition calibrator 40. The lifting mechanism 50 is used to adjust the tilt angle between the contour four-link 60 and the horizontal plane to ensure that the actual pressure output by the pressure regulating component 10 is not decomposed, thereby ensuring the accuracy of the measurement by the pressure acquisition calibrator 40.

[0041] Furthermore, such as Figure 3 As shown, in this embodiment, the lifting mechanism 50 includes: a load-bearing plate 51, a pair of X-shaped brackets 52, a pair of slide rails 53, a hydraulic cylinder 54, and a slider 56. The load-bearing plate 51 is located below the depth-limiting wheel 20 and abuts against the depth-limiting wheel 20. The pair of slide rails 53 are located below the load-bearing plate 51. The first end of each X-shaped bracket 52 is connected to the load-bearing plate 51, and the second end of each X-shaped bracket 52 is connected to a slider 56. The slider 56 is slidably connected to the slide rail 53. The first end of the hydraulic cylinder 54 is connected to the slider 56, and the second end of the hydraulic cylinder 54 is connected to the X-shaped bracket 52.

[0042] Specifically, the X-shaped bracket 52 includes two legs that are hinged together. The first end of each leg is connected to the bottom surface of the load-bearing plate 51, and the second end of each leg is connected to a slider 56. The slider 56 is located within a slide rail 53 and can slide along the slide rail 53. Each X-shaped bracket 52 is connected to a hydraulic cylinder 54, with its two ends connected to the slider 56 and the leg, respectively. Adjusting the extension and retraction of the two hydraulic cylinders 54 can adjust the tilt angle between the load-bearing plate 51 and the ground. Specifically, when the ground is uneven, adjusting the extension and retraction of the two hydraulic cylinders 54 can level the load-bearing plate 51, thereby leveling the contoured four-link 60 and ensuring the accuracy of the pressure acquisition calibrator 40.

[0043] Furthermore, the lifting mechanism 50 also includes a hydraulic pump 55, which is connected to the cylinder 54 and is used to drive the cylinder 54 to extend and retract.

[0044] Optionally, as shown in Figure 4, in another embodiment of the present invention, the lifting mechanism 50 includes: a load-bearing plate 51, a motor 501, a first lead screw 502, a commutator 503, and a second lead screw 504. When the motor 501 rotates in the forward or reverse direction, it can drive the first lead screw 502 to rotate. The commutator 503 is used to convert the horizontal linear motion of the first lead screw 502 into the vertical linear motion of the second lead screw 504. The load-bearing plate 51 is sleeved on the outside of the second lead screw 504, and when the second lead screw 504 rotates, it can drive the load-bearing plate 51 to move vertically. Further, in this embodiment, there are two commutators 503 and two lead screws 504. The two second lead screws 504 are located at both ends of the load-bearing plate 51. When the rotational speeds of the two second lead screws 504 are different, the lifting speeds at both ends of the load-bearing plate 51 are different. When the ground is uneven, the load-bearing plate 51 can be leveled by adjusting the rotation speed of the two second lead screws 504, thereby making the contour four-link 60 level, so as to ensure the accuracy of the pressure acquisition calibrator 40.

[0045] like Figure 1 As shown, in an embodiment of the present invention, the ground pressure measurement and calibration device of the seeding depth limiting wheel further includes a furrow opener 80, which is connected to the machine body 100 and is located between a pair of depth limiting wheels 20.

[0046] Specifically, the trencher 80 is fixed at a certain angle on the machine body 100. By changing the actual pressure output by the pressure regulating component 10, the ground pressure of the depth limiting wheel 20 can be adjusted, thereby ensuring that the trencher 80 can reach a suitable trenching depth under different soil hardness conditions.

[0047] like Figure 5 As shown, in an embodiment of the present invention, the load-bearing plate 51 is provided with a hollow groove 511, and part of the trencher 80 extends through the hollow groove 511 to the bottom of the load-bearing plate 51, thereby suspending the trencher 80 in the air above the machine body 100, so that the actual pressure output by the pressure regulating component 10 is fully applied to the depth limiting wheel 20, reducing the difference between the actual pressure and the pressure on the ground.

[0048] Furthermore, such as Figure 6 and Figure 7 As shown, in an embodiment of the present invention, the ground pressure measurement and calibration device of the seeding depth limiting wheel further includes a fixing member 30. The fixing member 30 is used to fix the pressure sensor. The fixing member 30 is located on the machine body 100 near the depth limiting wheel 20. The fixing member 30 is a four-jaw chuck. The back of each pair of jaws is tightened or loosened by screws, thereby changing the distance between the four-jaw chuck and the machine body 100. The gripping force of the two pairs of jaws can be adjusted simultaneously to fix the pressure sensor.

[0049] Further, in the embodiment, the side surface of each claw is stepped, when the stepped surfaces of the two claws are oppositely arranged, a plurality of mounting spaces with different sizes are formed between the pair of claws, and different types of pressure sensors can be mounted, thereby improving the applicability of the seeding depth limiting wheel ground pressure measurement calibration device.

[0050] The seeding depth limiting wheel ground pressure measurement calibration device provided by the embodiment of the application can adapt to different specifications and types of pressure sensors on a seeding machine, improve the efficiency of user calibration modeling, save time, improve the detection accuracy of the load sensor, lay a foundation for subsequent accurate regulation of seedbed firmness, and further construct a good seedbed compaction environment to promote seed growth and development.

[0051] The embodiment of the application further provides a method for measuring and calibrating the ground pressure of a seeding depth limiting wheel, specifically comprising the following steps:

[0052] Step 01: Adjust the actual pressure output by the pressure adjusting part 10 at a preset time interval.

[0053] Specifically, the pressure collecting calibrator 40 sends a signal to the pressure adjusting part 10 at a preset time interval to control the pressure adjusting part 10 to adjust the actual pressure output. It should be noted that in the embodiment, the preset time interval can be set according to the measurement requirements.

[0054] Step 02: Obtain a plurality of actual pressures of the pressure adjusting part 10 and a plurality of ground pressures applied to the ground by the depth limiting wheel 20.

[0055] Specifically, the actual pressure output by the pressure adjusting part 10 acts on the pressure sensor, and the pressure sensor sends the detected actual pressure to the pressure collecting calibrator 40. The pressure collecting calibrator 40 is provided with a load sensor, the load sensor detects the ground pressure applied to the ground by the depth limiting wheel 20, and sends the detected data to the pressure collecting calibrator 40.

[0056] Step 03: Store the plurality of actual pressures and the plurality of ground pressures in an array form, and perform data fitting to establish a depth limiting wheel ground pressure measurement model.

[0057] Specifically, after the pressure collecting calibrator 40 receives and stores the plurality of actual pressures x and the plurality of ground pressures y, the fitting curve distance from each discrete point distance and the minimum principle, i.e., the minimum value of the sum of squares of total error formula, is used for calculation, and the specific calculation formula is as follows:

[0058]

[0059] Wherein, x is the actual pressure, y is the ground pressure, a and b are key parameters, and different a and b will lead to different When their partial derivatives are equal to 0, The minimum value can be taken.

[0060] For example, when the established depth limiting wheel ground pressure measurement model is a one-order equation, the corresponding a and b can be calculated by the following formula. The data fitting part includes but is not limited to gradient descent method, Gauss Newton (i.e. iterative least squares), Levenberg-Marquardt algorithm and other methods, which can realize one-order polynomial fitting, and details are not described here.

[0061]

[0062]

[0063] The sowing depth limiting wheel ground pressure measurement calibration method provided by the embodiment of the application can automatically obtain a plurality of actual pressures and a plurality of ground pressures, and then establish a depth limiting wheel ground pressure measurement model, thereby avoiding the problems of high labor intensity, long time consumption, low efficiency and poor accuracy caused by manual recording and manual fitting.

[0064] Further, in the embodiment of the application, before the actual pressure output by the pressure adjusting member 10 is adjusted at the preset time interval, the sowing depth limiting wheel ground pressure measurement calibration method further comprises the following steps: controlling the lifting mechanism 50 to act, so that the inclination angle between the profiled four-bar linkage 60 and the horizontal plane is 0°.

[0065] Specifically, before measurement and calibration, the oil cylinder 54 is controlled to act, so that the X-shaped support 52 acts, and then the inclination angle between the load-bearing plate 51 and the ground is adjusted, so that the profiled four-bar linkage 60 is in a horizontal state, so as to ensure that the actual pressure output by the pressure adjusting member 10 will not be decomposed in the transmission process, thereby ensuring the detection accuracy of the pressure collection calibrator 40.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A seeding depth wheel ground pressure measurement calibration device, characterized by, The utility model relates to a depth limiting wheel pressure measuring device, comprising: a machine body connected with a pair of depth limiting wheels; a pressure adjusting part arranged on the machine body, the pressure adjusting part is used for adjusting the pressure of the depth limiting wheels on the ground; a pressure sensor arranged on the machine body, the pressure sensor is used for detecting the actual pressure output by the pressure adjusting part; a pressure collection calibrator arranged below the depth limiting wheels and abutting against the depth limiting wheels, the pressure collection calibrator comprises: a load cell used for detecting the pressure of the depth limiting wheels on the ground; a processor electrically connected with the load cell and the pressure sensor, the processor is used for adjusting the actual pressure output by the pressure adjusting part, the processor is used for storing a plurality of the actual pressures and a plurality of the pressures on the ground, and defining the plurality of the actual pressures and the plurality of the pressures on the ground as two groups of data, and establishing a depth limiting wheel pressure measuring model through data fitting by the least square method.

2. The seeding depth wheel ground pressure measurement calibration apparatus of claim 1, wherein, The processor comprises a signal amplification circuit, an A / D acquisition module and a single-chip microcomputer which are electrically connected in sequence, and the signal amplification circuit is electrically connected with the load cell.

3. The seeding depth wheel ground pressure measurement calibration apparatus of claim 1, wherein, Further comprising: a profiled four-bar linkage hinged to the machine body, one end of the pressure adjusting part is connected with the machine body, and the other end of the pressure adjusting part is hinged to the profiled four-bar linkage; a levelness detector arranged on the profiled four-bar linkage, the levelness detector is used for detecting the inclination angle between the profiled four-bar linkage and the horizontal plane.

4. The seeding depth wheel ground pressure measurement calibration apparatus of claim 3, wherein, Further comprising a lifting mechanism arranged between the depth limiting wheels and the pressure collection calibrator, the lifting mechanism is used for adjusting the inclination angle between the profiled four-bar linkage and the horizontal plane.

5. The seeding depth wheel ground pressure measurement calibration apparatus of claim 4, wherein, The lifting mechanism comprises: a bearing plate located below the depth limiting wheels and abutting against the depth limiting wheels; a pair of slide rails located below the bearing plate; a pair of X-shaped supports, the first end of each X-shaped support is connected with the bearing plate, and the second end of each X-shaped support is connected with a sliding block, and the sliding block is slidingly connected with the slide rail; a pair of oil cylinders, the first end of each oil cylinder is connected with one sliding block, and the second end of each oil cylinder is connected with one X-shaped support, so as to adjust the inclination angle between the bearing plate and the horizontal plane.

6. The seeding depth wheel ground pressure measurement calibration apparatus of claim 5, wherein, Further comprising a furrow opener connected with the machine body, the furrow opener is located between the pair of depth limiting wheels.

7. The seeding depth wheel ground pressure measurement calibration apparatus of claim 6, wherein, The bearing plate is provided with a hollow groove, and part of the furrow opener extends to the lower side of the bearing plate through the hollow groove, so that the furrow opener is in a suspended state.

8. A method for calibrating the ground pressure of a seeding depth wheel pair using the calibration device for ground pressure of a seeding depth wheel pair according to any one of claims 4 to 7, characterized in that The method comprises the following steps: adjusting the actual pressure output by the pressure adjusting part at a preset time interval; obtaining a plurality of the actual pressures of the pressure adjusting part and a plurality of the pressures on the ground applied by the depth limiting wheels; storing the plurality of the actual pressures and the plurality of the pressures on the ground in an array form, and performing data fitting to establish a depth limiting wheel pressure measuring model.

9. The method of seeding depth wheel ground pressure measurement calibration of claim 8, wherein, Before the step of adjusting the actual pressure output by the pressure adjusting part at a preset time interval, the method further comprises the following steps: controlling the lifting mechanism to act, so that the inclination angle between the profiled four-bar linkage and the horizontal plane is 0°.

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