A magnetic force profiling device and a magnetic force profiling method for a self-propelled flax scutcher scutcher table

Abstract

The application relates to a magnetic profiling device and a magnetic profiling method for a flax pulling table of a self-propelled flax pulling machine, and relates to the technical field of agricultural machinery. The magnetic profiling device comprises a vehicle frame, a flax pulling table, a magnetic support base, a laser ranging sensor, an active electromagnetic force servo adjusting system and a guide mechanism. The magnetic support base is composed of two mutually repulsive permanent magnets and is used for suspending the flax pulling table above the vehicle frame. The active electromagnetic force servo adjusting system is arranged at the periphery of the magnetic support base and is used for adjusting the lifting of the flax pulling table. The laser ranging sensor is screwed below the front of the vehicle frame and is used for detecting the height change of the clamping point and feeding back to the PLC to control the current change through the driver, so as to change the magnetic force and complete the profiling task. The guide mechanism limits the horizontal displacement of the flax pulling table. The main part of the application is supported by magnetic force without contact, and compared with the traditional profiling modes of hydraulic pressure, springs and four rods, the application has the advantages of zero wear, low noise, high adjusting precision and the like.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery, and in particular relates to flax harvesting equipment, specifically a magnetic contouring device and magnetic contouring method for a self-propelled flax harvester's harvesting platform. Background Technology

[0002] Flax fiber is highly valued both domestically and internationally for its excellent heat dissipation, high moisture absorption, good toughness, and long service life. In recent years, with the continuous expansion of planting areas, the demand for high-quality flax harvesting operations has also increased. The contouring capability of the flax harvesting platform directly determines the operational quality of the flax harvester. Existing contouring devices suffer from severe mechanical wear, slow response, and unstable contouring. Therefore, how to achieve the contouring task of the flax harvesting platform that meets the agronomical requirements of flax harvesting has become an urgent problem to be solved to improve flax harvesting efficiency. Existing flax harvesting machine contouring devices, such as four-bar linkages, suffer from hinge clearance and friction damping issues; spring-based contouring suffers from inertial lag; and hydraulic oil requires time to build up pressure. For example, when the ground suddenly changes from a depression to a ridge, the mechanical structure reacts sluggishly, causing the flax harvesting platform to scrape the soil before lifting, reducing the operational quality of the flax harvester. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a magnetic contouring device and method for a self-propelled flax pulling machine's pulling platform. This method achieves zero contact between the main components, reduces mechanical wear, and improves production efficiency. The invention primarily uses a pair of permanent magnets to bear most of the weight of the pulling platform and an intelligent recognition system to change the current of the electromagnet, thereby affecting the magnitude of the electromagnetic force to complete the contouring task. This solves the problems of high mechanical wear, high noise, and insensitive adjustment associated with traditional hydraulic, spring, and four-bar contouring methods.

[0004] The technical solution adopted by this invention to solve its technical problem is: a magnetic contouring device for a self-propelled flax pulling machine's pulling platform, comprising a frame, a guiding mechanism, an active electromagnetic force servo adjustment system, a pulling platform frame, and a magnetic support base, a laser rangefinder, and a telescopic protective cover mounted on the frame. The laser rangefinder is screwed to the bottom front end of the frame. The pulling platform frame is fixed to the bottom of the pulling platform and floats above the frame together with the pulling platform. The pulling platform is slidably connected to the lower frame through the guiding mechanism, which consists of a guide rail screwed to the frame and a sliding sleeve fixed to the pulling platform. The magnetic support base includes a fixed magnetic pole assembly screwed to the frame and a moving magnetic pole assembly screwed to the pulling platform frame. The system uses axial magnetization, and the magnetization surfaces of the fixed magnetic pole assembly and the moving magnetic pole assembly are arranged in a coaxial opposing layout with like poles repelling each other. The active electromagnetic force servo adjustment system includes four fixed electromagnet assemblies screwed onto the frame and four dynamic proportional electromagnet assemblies screwed onto the hemp pulling platform. The four fixed electromagnet assemblies are symmetrically arranged along the X-axis and Y-axis, wherein the magnetization surfaces of the fixed electromagnets and the four dynamic proportional electromagnets are arranged in a coaxial, opposite arrangement with the same poles repelling each other.

[0005] A further feature of the present invention is that the telescopic protective cover is composed of an inner sleeve, an outer sleeve, and a graphite copper sleeve embedded in the inner wall of the outer sleeve, which are nested together and can slide relative to each other, and the two ends of the telescopic protective cover are bonded to the magnet base.

[0006] A further feature of the present invention is that the fixed electromagnet assembly has the same structure as the dynamic proportional electromagnet assembly, the fixed magnetic pole assembly, and the moving magnetic pole assembly, and is composed of a fixed electromagnet and a magnet base screwed onto the frame.

[0007] A further feature of the present invention is that the magnet base consists of two parts: an anti-slip groove and a stainless steel pressure ring, which are connected by non-magnetic stainless steel bolts, and the inner wall of the anti-slip groove is coated with 2mm thick epoxy resin structural adhesive.

[0008] A magnetic contouring method for the flax pulling table of a self-propelled flax pulling machine includes the following steps: S1. After installing the magnetic contouring device for the flax pulling platform of the self-propelled flax pulling machine, the magnetic support base bears most of the weight of the flax pulling platform under the repulsive force of a pair of large permanent magnets, and the remaining weight is borne by 4 pairs of electromagnets, which ultimately makes the flax pulling platform suspend above the machine frame. S2. When the laser rangefinder detects a change in the height of the clamping point during the hemp pulling operation, it feeds the result back to the PLC. After calculation by the PLC, the current is changed by the driver, which in turn controls the change in the magnetic force of the proportional electromagnet, so that the hemp pulling table is raised or lowered to complete the contouring task. S3. When the clamping point is lowered, the PLC-controlled driver reduces the current, the repulsive force between the moving proportional electromagnet and the fixed electromagnet decreases, and the hemp-pulling platform descends. When the clamping point is raised, the PLC-controlled driver increases the current, the repulsive force between the moving proportional electromagnet and the fixed electromagnet increases, and the hemp-pulling platform rises. The magnetic contouring effectively prevents soil shoveling and missed pulling, improving the working quality of the hemp-pulling machine.

[0009] The beneficial effects of this invention are as follows: 1. This invention employs an intelligent magnetic contouring method, which significantly reduces mechanical contact and friction, improves the flax pulling efficiency of the flax pulling machine, reduces the mechanical failure rate, and increases response sensitivity. Permanent magnets bear most of the weight of the pulling platform, while electromagnets control the lifting and lowering of the platform. This solves the problems of insufficient power supply when using only electromagnets and the inability to adjust the lifting and lowering when using only permanent magnets. The permanent magnets and electromagnets work together to achieve the lifting and lowering of the pulling platform without increasing the mechanical structure.

[0010] 2. The main body of the hemp-pulling platform is made of non-magnetic lightweight alloy materials such as 7075 aluminum alloy. The drive wheel is made of lightweight alloy with rubber coating, and the driven wheel is made of cast nylon to reduce weight. After adjusting the materials, the overall weight of the hemp-pulling platform is greatly reduced. The bolts are made of non-magnetic materials such as 304 stainless steel bolts, and the magnet base is made of non-magnetic material to effectively prevent static electricity from the magnet.

[0011] 3. The main body has zero contact and is equipped with a retractable non-magnetic protective cover, which can reduce noise, reduce friction, and prevent interference from metal debris, thereby improving operational safety. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the frame structure of the present invention; Figure 3 This is a schematic diagram of the hemp-pulling platform structure of the present invention. Figure 4 This is a schematic diagram of the retractable protective cover structure of the present invention; Figure 5 This is a schematic diagram of the magnet holder structure of the present invention; Figure 6 This is an overall flowchart of the present invention; In the diagram: 1. Frame; 2. Guide mechanism; 21. Guide rail; 22. Sliding sleeve; 3. Active electromagnetic force servo adjustment system; 31. Fixed electromagnet assembly; 31. Moving proportional electromagnet assembly; 311. Fixed electromagnet; 321. Moving proportional electromagnet; 4. Hemp pulling table; 5. Magnetic support base; 51. Fixed magnetic pole assembly; 52. Moving magnetic pole assembly; 6. Telescopic protective cover; 61. Inner sleeve; 62. Outer sleeve; 63. Graphite copper sleeve; 7. Laser rangefinder sensor; 8. Hemp pulling table; 9. Magnet base; 91. Anti-slip groove; 92. Stainless steel pressure ring; 10. Non-magnetic stainless steel bolt. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0015] See Figures 1-5 The present invention provides a magnetic contouring device for a self-propelled flax pulling machine pulling platform, comprising a frame, a guiding mechanism, an active electromagnetic force servo adjustment system, a pulling platform frame, and a magnetic support base, a laser rangefinder, and a telescopic protective cover mounted on the frame, wherein the laser rangefinder is screwed to the bottom front end of the frame. The hemp-pulling platform is fixed to the bottom of the hemp-pulling platform and suspended above the machine frame together with the hemp-pulling platform. The hemp-pulling platform is slidably connected to the machine frame below through a guide mechanism, which consists of a guide rail screwed to the machine frame and a sliding sleeve fixed to the hemp-pulling platform. The magnetic support base includes a fixed magnetic pole assembly screwed onto the frame and a moving magnetic pole assembly screwed onto the hemp-pulling table. The system adopts axial magnetization, and the magnetization surfaces of the fixed magnetic pole assembly and the moving magnetic pole assembly are arranged in a coaxial opposing layout with like poles repelling each other. The active electromagnetic force servo adjustment system includes four fixed electromagnet assemblies screwed onto the frame and four dynamic proportional electromagnet assemblies screwed onto the hemp pulling platform. The four fixed electromagnet assemblies are symmetrically arranged along the X-axis and Y-axis, wherein the magnetization surfaces of the fixed electromagnets and the four dynamic proportional electromagnets are arranged in a coaxial, opposite arrangement with the same poles repelling each other.

[0016] Before the hemp-pulling machine is started, the hemp-pulling platform is suspended above the machine frame and at its lowest point under the action of the magnetic support base. At the same time, the horizontal displacement is restricted by the guide mechanism. After the hemp-pulling machine is started, the four pairs of electromagnets are magnetized to push the hemp-pulling platform to the highest point.

[0017] During operation, the laser rangefinder detects the height of the clamping point and feeds the signal back to the PLC. When the clamping point is lowered, the PLC controls the driver to reduce the current of the four moving electromagnets at the same time. The electromagnet repulsive force decreases, causing the hemp-pulling platform to fall a certain distance. Conversely, it raises the hemp-pulling platform to complete the hemp-pulling platform contouring task.

[0018] In this embodiment, a telescopic protective cover is fitted around the magnetic support base and the four pairs of electromagnets. The telescopic protective cover can extend, descend, and retract as the hemp-pulling platform rises, and its function is to shield against metal debris in the field to ensure the normal operation of the contouring device.

[0019] As a preferred technical solution, the telescopic protective cover consists of an inner sleeve, an outer sleeve, and a graphite copper sleeve embedded in the inner wall of the outer sleeve, which are nested together and can slide relative to each other. The two ends of the telescopic protective cover are bonded to the magnet base.

[0020] Specifically, the telescopic protective cover is fixed at both ends to the magnet base, and the inner and outer sleeves move up and down with the frame and the hemp pulling platform respectively. They can freely extend and retract within the adjustment range of the hemp pulling platform. The graphite copper sleeve and the inner wall of the outer sleeve are interference-fitted to provide lubrication and wear resistance.

[0021] As a preferred technical solution, the fixed electromagnet assembly has the same structure as the moving proportional electromagnet assembly, the fixed magnetic pole assembly, and the moving magnetic pole assembly, and is composed of a fixed electromagnet and a magnet base screwed onto the frame.

[0022] As a preferred technical solution, the magnet base consists of two parts: an anti-slip groove and a stainless steel pressure ring. The two parts are connected by non-magnetic stainless steel bolts, and the inner wall of the anti-slip groove is coated with 2mm thick epoxy resin structural adhesive.

[0023] In this embodiment, the magnet base structures for fixing the permanent magnet and the electromagnet are identical. The anti-slip groove and the stainless steel pressure ring restrict the degrees of freedom of the permanent magnet and the electromagnet in all directions, lock the magnet to prevent it from falling out, and the 2mm thick epoxy resin structural adhesive plays a role in buffering and shock absorption.

[0024] The present invention also provides a magnetic contouring method for a magnetic contouring device on the hemp-pulling platform of a self-propelled flax-pulling machine, comprising the following steps: S1. After installing the magnetic contouring device for the flax pulling platform of the self-propelled flax pulling machine, the magnetic support base bears most of the weight of the flax pulling platform under the repulsive force of a pair of large permanent magnets, and the remaining weight is borne by 4 pairs of electromagnets, which ultimately makes the flax pulling platform suspend above the machine frame. S2. When the laser rangefinder detects a change in the height of the clamping point during the hemp pulling operation, it feeds the result back to the PLC. After calculation by the PLC, the current is changed by the driver, which in turn controls the change in the magnetic force of the proportional electromagnet, so that the hemp pulling table is raised or lowered to complete the contouring task. S3. When the clamping point is lowered, the PLC-controlled driver reduces the current, the repulsive force between the moving proportional electromagnet and the fixed electromagnet decreases, and the hemp-pulling platform descends. When the clamping point is raised, the PLC-controlled driver increases the current, the repulsive force between the moving proportional electromagnet and the fixed electromagnet increases, and the hemp-pulling platform rises. The magnetic contouring effectively prevents soil shoveling and missed pulling, improving the working quality of the hemp-pulling machine.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The descriptions in the above embodiments and specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic contouring device for the flax pulling platform of a self-propelled flax pulling machine, characterized in that: The system includes a frame (1), a guide mechanism (2), an active electromagnetic force servo adjustment system (3), a hemp-pulling platform (4), a magnetic support base (5), a laser rangefinder (7), and a telescopic protective cover (6) mounted on the frame (1). The laser rangefinder (7) is screwed to the bottom front end of the frame (1). The hemp-pulling platform (4) is fixed to the bottom of the hemp-pulling platform (8) and floats above the frame (1) together with the hemp-pulling platform (8). The hemp-pulling platform is slidably connected to the lower frame through the guide mechanism (2). The guide mechanism (2) consists of a guide rail (21) screwed to the frame (1) and a sliding sleeve (22) fixed to the hemp-pulling platform. The magnetic support base (5) The system includes a fixed magnetic pole assembly (51) screwed onto the frame (1) and a moving magnetic pole assembly (52) screwed onto the hemp-pulling platform (4). The system is axially magnetized, and the magnetization surfaces of the fixed magnetic pole assembly and the moving magnetic pole assembly are arranged in a coaxial position with repulsion between the same poles. The active electromagnetic force servo adjustment system (3) includes four fixed electromagnet assemblies (31) screwed onto the frame (1) and four moving proportional electromagnet assemblies (32) screwed onto the hemp-pulling platform (4). The four fixed electromagnet assemblies (31) are arranged symmetrically along the X-axis and Y-axis directions. The magnetization surfaces of the fixed electromagnets (311) and the four moving proportional electromagnets (321) are arranged in a coaxial position with repulsion between the same poles.

2. The magnetic contouring device for the hemp-pulling platform of a self-propelled flax-pulling machine according to claim 1, characterized in that: The telescopic protective cover (6) consists of an inner sleeve (61) that can slide relative to each other, an outer sleeve (62) and a graphite copper sleeve (63) embedded in the inner wall of the outer sleeve (62) and nested together. The two ends of the telescopic protective cover (6) are bonded to the magnet base (9).

3. The magnetic contouring device for the hemp-pulling platform of a self-propelled flax-pulling machine according to claim 1, characterized in that: The fixed electromagnet assembly (31) has the same structure as the dynamic proportional electromagnet assembly (32), the fixed magnetic pole assembly (51) and the moving magnetic pole assembly (52), and is composed of a fixed electromagnet (311) and a magnet base (9) screwed onto the frame (1).

4. The magnetic contouring device for the hemp-pulling platform of a self-propelled flax-pulling machine according to claim 3, characterized in that: The magnet base (9) consists of two parts: an anti-slip groove (91) and a stainless steel pressure ring (92). The two parts are connected by a non-magnetic stainless steel bolt (10). The inner wall of the anti-slip groove (91) is coated with 2mm thick epoxy resin structural adhesive.

5. A magnetic contouring method for a magnetic contouring device of a self-propelled flax pulling machine's pulling platform according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. After installing the magnetic contouring device on the flax pulling platform of the self-propelled flax pulling machine, the magnetic support base (5) bears most of the weight of the pulling platform (8) under the repulsive force of a pair of large permanent magnets, and the remaining weight is borne by 4 pairs of electromagnets, so that the pulling platform (8) is suspended above the frame (1); S2. When the laser rangefinder (7) detects the change in the height of the clamping point during the flax pulling operation, it feeds the result back to the PLC. After the PLC calculates, it changes the current through the driver, thereby controlling the proportional electromagnet ( 321) The change in magnetic force causes the hemp-pulling platform (8) to rise or fall to complete the contouring task; S3) When the clamping point is lowered, the PLC control driver reduces the current, and the repulsive force between the moving proportional electromagnet (321) and the fixed electromagnet (311) decreases, causing the hemp-pulling platform (8) to fall. When the clamping point is raised, the PLC control driver increases the current, and the repulsive force between the moving proportional electromagnet (321) and the fixed electromagnet (311) increases, causing the hemp-pulling platform to rise. Magnetic contouring effectively prevents soil shoveling and missed pulling, improving the operation quality of the hemp-pulling machine.

Images