A lawn mowing head with adjustable mowing height

Abstract

This utility model relates to the field of lawn mowing head technology, and discloses a lawn mowing head with adjustable mowing height. It includes a cover plate and a base connected to the bottom of the cover plate. A cable outlet is provided on the side of the base, and a flap is hinged to the side of the base. An adjustment mechanism is provided inside the cable outlet. The adjustment mechanism includes an adjustment frame, a through groove, a sliding rod, a slider, a fixed magnet, a telescopic rod, a miniature hydraulic cylinder, a fixed box, a movable magnet, a return spring, a cable conduit, and an anti-slip sleeve. This lawn mowing head with adjustable mowing height achieves precise adjustment of the mowing height by using an adjustment mechanism inside the cable outlet and a miniature hydraulic cylinder to drive the telescopic rod to extend and retract, causing the slider to move along the sliding rod. This changes the length of the mowing line extending from the cable outlet inside the cable conduit. The entire adjustment process does not require disassembling the lawn mowing head; it can be operated through an external control system. Operators can adjust the mowing height in real time according to the height requirements of different cutting targets such as lawns and weeds.

Description

Technical Field

[0001] This utility model belongs to the field of lawn mowing head technology, specifically, it relates to a lawn mowing head with adjustable mowing height. Background Technology

[0002] Lawn mowers are widely used as efficient weed control devices in landscaping, farmland management, and home garden maintenance. The mowing head, as the core component of the lawn mower, directly determines the quality and efficiency of the mowing operation. Currently, most lawn mowing heads on the market use a fixed design, with the mowing line extension length preset at the factory, making it impossible to flexibly adjust according to actual operational needs.

[0003] In practical use, the required mowing height varies significantly depending on the scenario. For example, when mowing lawns, a shorter mowing height is needed to ensure a neat and healthy lawn; while when clearing weeds in fields or tall roadside plants, a longer mowing height is required to ensure a clean cut in one go. However, existing fixed-height lawnmowers cannot meet these diverse needs. If users need to adjust the mowing height, they can only do so by replacing the lawnmower with a different size or manually disassembling the lawnmower and readjusting the mowing line length. This method not only requires preparing multiple lawnmowers, increasing equipment investment costs, but the manual adjustment process is also cumbersome, requiring machine downtime, which seriously affects the continuity and efficiency of mowing operations, causing great inconvenience to users. Utility Model Content

[0004] The purpose of this invention is to provide a mowing head with adjustable mowing height to solve the problems mentioned in the background art.

[0005] A lawn mower head with adjustable mowing height includes a cover plate and a base connected to the bottom of the cover plate. The base has a cable outlet on its side and a flap is hinged to the side of the base. An adjustment mechanism is provided inside the cable outlet.

[0006] The adjustment mechanism includes an adjustment frame, a through groove, a slide rod, a slider, a fixed magnet, a telescopic rod, a miniature hydraulic cylinder, a fixed box, a movable magnet, a return spring, a conduit, and an anti-slip sleeve. The adjustment frame is fixedly connected to the inner wall of the cable outlet. The through groove is formed on the outer surface of the adjustment frame. The slide rod is fixedly connected to the inside of the through groove. The slider is slidably connected to the outer surface of the slide rod. The fixed magnet is fixedly connected to one side of the slider. The telescopic rod is fixedly connected to the top of the slider. The miniature hydraulic cylinder is installed at the top of the telescopic rod. The fixed box is fixedly connected to the outer surface of the adjustment frame. The return spring is fixedly connected to the inner wall of the fixed box. The movable magnet is fixedly connected to the end of the return spring away from the inner wall of the fixed box. The conduit is fixedly connected to the other side of the slider. A conduit hole is formed inside the conduit. The anti-slip sleeve is fixedly connected to the inner wall of the conduit hole.

[0007] In a preferred embodiment of this utility model, a partition compartment is fixedly connected to the inner wall of the cover plate, the adjustment mechanism is disposed inside the partition compartment, a positioning hole is provided on the upper surface of the partition compartment, a positioning post is fixedly connected to the bottom of the cover plate, and the positioning post and the partition compartment are connected by locking bolts.

[0008] In a preferred embodiment of this utility model, the inner wall of the compartment is threaded with a connecting bolt, the top of the compartment is connected with a sealing ring, the top center of the cover plate is provided with an upper cover, and the lower surface of the upper cover is provided with bolt holes, which are threadedly connected to the connecting bolts.

[0009] In a preferred embodiment of this utility model, a sealing plate is fixedly connected to the bottom of the inner wall of the base, and a telescopic spring is fixedly connected to the center of the bottom of the partition compartment.

[0010] In a preferred embodiment of this utility model, the top of the micro hydraulic cylinder is fixedly connected to the bottom of the inner wall of the cover plate, the output end of the micro hydraulic cylinder is fixedly connected to the top of the telescopic rod, and the micro hydraulic cylinder is electrically connected to an external control system, which can control the extension and retraction length of the telescopic rod.

[0011] In a preferred embodiment of this utility model, the fixed magnetic block and the movable magnetic block have opposite surface magnetism. When the slider moves to a specific position, the fixed magnetic block and the movable magnetic block attract each other, and with the elastic force of the return spring, the slider is assisted in positioning.

[0012] In a preferred embodiment of this utility model, the anti-slip sleeve is made of rubber material and its inner wall is provided with anti-slip texture, which can increase the friction between the mowing line and the threaded tube.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This height-adjustable mowing head uses an adjustment mechanism inside the cable outlet. A miniature hydraulic cylinder drives a telescopic rod to extend and retract, which in turn moves a slider along the rod, thereby changing the length of the mowing line extending from the cable outlet inside the cable tube. This allows for precise adjustment of the mowing height. The entire adjustment process does not require disassembling the mowing head and can be completed through an external control system. Operators can adjust the mowing height in real time according to the height requirements of different cutting objects such as lawns and weeds.

[0014] 2. This height-adjustable mowing head uses a fixed magnetic block and a movable magnetic block with opposite magnetic surfaces. When the slider moves to the target position, the two attract each other. Combined with the elastic force of the return spring, this forms a stable auxiliary positioning for the slider. The hydraulic system of the micro hydraulic cylinder can lock the oil circuit through a one-way valve to further fix the length of the telescopic rod. The dual positioning structure can effectively counteract the radial tension generated when the mowing line rotates at high speed, preventing the slider from deviating during operation, ensuring a stable extension length of the mowing line, and preventing uneven cutting caused by inconsistent mowing height.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the lawn mower head of this utility model; Figure 2 This is a schematic diagram of the internal structure of the cover plate of this utility model; Figure 3 This is a schematic diagram of the top structure of the compartment of this utility model; Figure 4 This is a schematic diagram of the internal structure of the base of this utility model; Figure 5 This is a schematic diagram of the bottom structure of the compartment of this utility model; Figure 6 This is a schematic diagram of the adjustment mechanism structure of this utility model; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic diagram of the internal structure of the fixing box of this utility model.

[0017] In the diagram: 1. Cover plate; 2. Base; 3. Flip plate; 4. Cable outlet; 5. Top cover; 6. Sealing ring; 7. Divider compartment; 8. Connecting bolt; 9. Positioning hole; 10. Positioning post; 11. Locking bolt; 12. Sealing plate; 13. Telescopic spring; 14. Adjusting frame; 15. Through groove; 16. Slide rod; 17. Slider; 18. Fixed magnet; 19. Telescopic rod; 20. Miniature hydraulic cylinder; 21. Fixing box; 22. Movable magnet; 23. Return spring; 24. Cable conduit; 25. Anti-slip sleeve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0019] like Figures 1 to 8 As shown, a lawn mower head with adjustable mowing height includes a cover plate 1 and a base 2 connected to the bottom of the cover plate 1. The base 2 has a cable outlet 4 on its side and a flap 3 hinged to the side of the base 2. An adjustment mechanism is provided inside the cable outlet 4. A partition compartment 7 is fixedly connected to the inner wall of the cover plate 1. The adjustment mechanism is located inside the partition compartment 7. A positioning hole 9 is provided on the upper surface of the partition compartment 7. A positioning post 10 is fixedly connected to the bottom of the cover plate 1. The positioning post 10 and the partition compartment 8 are connected by a locking bolt 11. A connecting bolt 8 is threadedly connected to the top of the inner wall of the partition compartment 7. A sealing ring 6 is connected to the top of the partition compartment 7. An upper cover 5 is provided at the top center of the cover plate 1. A bolt hole is provided on the lower surface of the upper cover 5. The bolt hole is threadedly connected to the connecting bolt 8. A sealing plate 12 is fixedly connected to the bottom of the inner wall of the base 2. A telescopic spring 13 is fixedly connected to the bottom center of the partition compartment 7.

[0020] The adjustment mechanism includes an adjustment frame 14, a through groove 15, a slide rod 16, a slider 17, a fixed magnet 18, a telescopic rod 19, a miniature hydraulic cylinder 20, a fixed box 21, a movable magnet 22, a return spring 23, a conduit 24, and an anti-slip sleeve 25. The adjustment frame 14 is fixedly connected to the inner wall of the cable outlet 4. The through groove 15 is formed on the outer surface of the adjustment frame 14. The slide rod 16 is fixedly connected to the inside of the through groove 15. The slider 17 is slidably connected to the outer surface of the slide rod 16. The fixed magnet 18 is fixedly connected to the slider. On one side of slider 17, telescopic rod 19 is fixedly connected to the top of slider 17, micro hydraulic cylinder 20 is installed on the top of telescopic rod 19, fixed box 21 is fixedly connected to the outer surface of adjustment frame 14, return spring 23 is fixedly connected to the inner wall of fixed box 21, movable magnetic block 22 is fixedly connected to the end of return spring 23 away from the inner wall of fixed box 21, wire tube 24 is fixedly connected to the other side of slider 17, wire tube 24 has a wire hole inside, and anti-slip sleeve 25 is fixedly connected to the inner wall of wire hole.

[0021] The top of the miniature hydraulic cylinder 20 is fixedly connected to the bottom of the inner wall of the cover plate 1, and the output end of the miniature hydraulic cylinder 20 is fixedly connected to the top of the telescopic rod 19. The miniature hydraulic cylinder 20 is electrically connected to an external control system, which can control the extension and retraction length of the telescopic rod 19. The fixed magnetic block 18 and the movable magnetic block 22 have opposite magnetic surfaces. When the slider 17 moves to a specific position, the fixed magnetic block 18 and the movable magnetic block 22 attract each other, and with the elastic force of the return spring 23, the slider 17 is assisted in positioning. The anti-slip sleeve 25 is made of rubber, and its inner wall is provided with anti-slip texture, which can increase the friction between the mowing line and the threaded tube 24.

[0022] The outer diameter of the positioning post 10 is matched with the inner diameter of the positioning hole 9. After the positioning post 10 is inserted into the positioning hole 9, the cover plate 1 and the partition compartment 7 can be initially positioned, which facilitates the subsequent installation and fixing of the locking bolt 11. The locking bolt 11 is made of stainless steel and has an anti-rust coating on its surface, which can effectively improve the corrosion resistance of the locking bolt 11 and extend the service life of the grass cutter head. The partition compartment 7 is made of high-strength plastic material in one piece, which has the characteristics of light weight, high strength and wear resistance. It can effectively protect the adjustment mechanism and prevent external impurities from entering the adjustment mechanism and affecting its normal operation.

[0023] The sealing ring 6 is made of nitrile rubber with an O-shaped cross-section. The sealing ring 6 fits tightly in the gap between the partition compartment 7 and the upper cover 5, which can effectively prevent rainwater, dust and other impurities from entering the mowing head, ensuring the cleanliness and normal operation of the internal components of the mowing head. There are at least 4 connecting bolts 8, which are evenly distributed along the circumference of the partition compartment 7, making the connection between the upper cover 5 and the partition compartment 7 more firm and stable, and preventing the upper cover 5 from loosening during the high-speed rotation of the mowing head. The outer surface of the upper cover 5 is provided with anti-slip ridges, which makes it easy for operators to manually disassemble and install the upper cover 5, and facilitates the inspection and maintenance of the internal components of the mowing head.

[0024] The sealing plate 12 is made of metal, and its edge fits tightly against the inner wall of the base 2. It is fixedly connected by welding, which can effectively prevent impurities at the bottom of the base 2 from entering the mowing head. At the same time, it provides some support for the bottom of the partition compartment 7. The bottom end of the telescopic spring 13 abuts against the upper surface of the sealing plate 12. When the mowing head is subjected to external impact, the telescopic spring 13 can absorb part of the impact force through its own elastic deformation, which plays a role in buffering and shock absorption, reducing the impact force on the internal adjustment mechanism of the partition compartment 7 and extending the service life of the adjustment mechanism. The telescopic spring 13 is made of high-strength spring steel, which has good elastic recovery performance and fatigue strength, and can maintain stable elastic performance during long-term use.

[0025] The outer surface of the cover plate 1 is provided with heat dissipation holes, which are evenly distributed along the circumference of the cover plate 1, and the axis of the heat dissipation holes forms an angle of 30°-45° with the radial direction of the cover plate 1. The heat dissipation holes allow the heat generated inside the mowing head to be dissipated to the outside in a timely manner, preventing the internal temperature from being too high and affecting the performance of components such as the adjustment mechanism and the micro hydraulic cylinder, thus ensuring the normal working temperature of the mowing head. The design of the heat dissipation holes forming a certain angle with the radial direction of the cover plate 1 can effectively prevent rainwater, dust and other impurities from directly entering the interior of the mowing head through the heat dissipation holes while ensuring the heat dissipation effect, thereby reducing the contamination and damage of impurities to the internal components.

[0026] A buckle is fixedly connected to the side of the flip plate 3 away from the hinge. A slot adapted to the buckle is opened on the side of the base 2. The flip plate 3 is fastened and fixed to the base 2 by the cooperation of the buckle and the slot. The buckle is made of elastic plastic material and has a certain elastic deformation capability. When it is necessary to open the flip plate 3, simply press the buckle to deform it and disengage it from the slot, and the flip plate 3 can be rotated around the hinge. The operation is convenient. A sealing gasket is fixedly connected to the inner surface of the flip plate 3. The sealing gasket is made of foam rubber material. When the flip plate 3 is fastened to the base 2, the sealing gasket fits tightly against the gap between the flip plate 3 and the base 2, which can effectively prevent external impurities from entering the grass cutting head through the outlet 4 and protect the adjustment mechanism and the grass cutting line from impurities.

[0027] The cover plate 1 and the base 2 are made of aluminum alloy and formed by die casting. After forming, the surface is anodized, and the oxide film thickness is controlled at 8-12μm to improve corrosion resistance and surface hardness. The heat dissipation holes on the outer surface of the cover plate 1 are opened at an angle of 30°-45°, with a hole diameter of 5mm. One hole is evenly distributed every 60° along the circumference, for a total of 6 holes. A 100-mesh stainless steel dustproof mesh 28 is welded inside the heat dissipation holes. The edge of the dustproof mesh is fixed to the inner wall of the heat dissipation hole by laser welding to ensure a seamless fit.

[0028] The cable outlet 4 on the side of the base 2 is designed to be 80mm long and 20mm wide. The hinge is made of stainless steel and is fixed in the pre-set mounting holes on the side of the base 2 with screws. The flip plate 3 is made of ABS engineering plastic injection molding, and its edge is set with a 2mm thick foam rubber sealing gasket 31. The sealing gasket is fixed with environmentally friendly glue. The buckle 29 on the flip plate 3 and the slot 30 of the base 2 adopt an interference fit design, and the interference is controlled within 0.1-0.2mm to ensure tight fastening.

[0029] The adjusting frame 14 is milled from 45 steel, and the internal roughness of the through groove 15 is controlled at Ra1.6μm. The slide rod 16 is an 8mm diameter optical shaft with chrome plating and a chrome plating layer thickness of 0.02-0.03mm. The slider 17 is injection molded from polytetrafluoroethylene, and its clearance with the slide rod 16 is 0.05-0.1mm to ensure smooth sliding without obvious shaking.

[0030] The fixed magnet 18 and the movable magnet 22 are made of neodymium iron boron strong magnetic material with a magnetic flux density ≥1.4T. The opposite surfaces of the two are filled with N pole and S pole respectively. The fixed box 21 is made of PVC plastic injection molding. The internal reset spring 23 is made of spring steel with a diameter of 1.2mm, a free length of 30mm, and a stiffness coefficient of 5N / mm.

[0031] The conduit 24 is made of brass and machined. The diameter of the internal wire hole is designed to be 3-5mm according to the specifications of the mowing line. The anti-slip sleeve 25 is made of nitrile rubber with a Shore hardness of 60° and injection molded. The anti-slip texture on the inner wall is a spiral pattern with a depth of 0.5mm. It is press-fitted into the wire hole by interference fit.

[0032] The miniature hydraulic cylinder 20 is a miniature hydraulic cylinder with a stroke of 50mm and a rated pressure of 3MPa. The size of the matching hydraulic pump station is controlled within 100mm×50mm×30mm, which is convenient for integration into the handle of the lawnmower. The telescopic rod 19 is made of stainless steel and is connected to the output end of the miniature hydraulic cylinder by a thread with a thread specification of M6×1.

[0033] The partition compartment 7 is injection molded from PA66+30% glass fiber reinforced plastic with a wall thickness of 3mm. The top positioning hole 9 and the bottom positioning post 10 of the cover plate 1 are transition fit. The positioning post 10 has a diameter of 10mm, and the positioning hole 9 has a diameter of 10.02-10.05mm. The locking bolt 11 and the connecting bolt 8 are both M5×10 stainless steel hexagon socket bolts with passivated surface treatment. The sealing ring 6 is an O-ring nitrile rubber ring with a cross-sectional diameter of 3mm, which is fixed to the top of the partition compartment 7 through a groove.

[0034] The sealing plate 12 is made of 2mm thick stainless steel plate laser-cut and the edge is welded to the inner wall of the base 2 by argon arc welding with a weld height of 1.5mm. The telescopic spring 13 is made of 2mm diameter spring steel with a free length of 40mm and a stiffness coefficient of 8N / mm. The top end is fixed to the bottom of the partition compartment 7 by welding, and the bottom end is in contact with the upper surface of the sealing plate 12 but not fixed, leaving room for movement.

[0035] Base component assembly: First, place the sealing plate 12 inside the base 2, adjust it to the center position, and then perform argon arc welding along the edge of the sealing plate 12. After welding, clean the weld slag to ensure that the weld is flat.

[0036] The second step is to weld the top of the telescopic spring 13 to the pre-set welding point at the bottom center of the partition compartment 7, and then place the partition compartment 7 into the base 2 so that the bottom of the telescopic spring 13 naturally contacts the upper surface of the sealing plate 12.

[0037] The third step is to fix the hinge to one side of the cable outlet 4 on the side of the base 2, and then install the flip plate 3 with the sealing gasket 31 on the hinge. Test the opening and closing flexibility of the flip plate 3 to ensure that the buckle 29 can smoothly engage with the slot 30.

[0038] Adjustment mechanism assembly: First, insert the slide rod 16 into the through groove 15 of the adjustment frame 14 and fix both ends with set screws. Then, put the slider 17 on the slide rod 16 and test the sliding resistance to ensure that the resistance is ≤5N.

[0039] The second step is to glue the fixed magnetic block 18 to one side of the slider 17, and fix the fixed box 21 to the corresponding position of the adjusting frame 14 with screws. The return spring 23 and the movable magnetic block 22 are installed in the fixed box 21. The position of the fixed box 21 is adjusted so that the movable magnetic block 22 and the fixed magnetic block 18 can accurately attract each other when the slider 17 moves.

[0040] The third step is to fix the conduit 24 to the other side of the slider 17 by threaded connection, then press the anti-slip sleeve 25 into the conduit hole of the conduit 24, and finally fix the assembled adjustment mechanism inside the compartment 7 with screws to ensure that the adjustment frame 14 is aligned with the outlet 4.

[0041] Assemble the cover and top cover: First, fix the top of the miniature hydraulic cylinder 20 to the pre-set mounting base at the bottom of the inner wall of the cover plate 1 with screws. Then, connect the bottom of the telescopic rod 19 to the top of the slider 17 with threads, and adjust the position of the miniature hydraulic cylinder 20 to ensure that the telescopic rod 19 extends and retracts without jamming.

[0042] The second step is to align the positioning pin 10 at the bottom of the cover plate 1 with the positioning hole 9 at the top of the compartment 7, and slowly press down the cover plate 1 so that the positioning pin 10 is fully inserted into the positioning hole 9. Then, use the locking bolt 11 to pass through the bolt holes of the cover plate 1 and the compartment 7 and tighten it. The torque should be controlled at 5-8 N·m.

[0043] The third step is to place the sealing ring 6 in the groove at the top of the compartment 7, cover the top center of the cover plate 1 with the top cover 5, align the bolt holes on the lower surface of the top cover 5 with the connecting bolts 8 at the top of the compartment 7, tighten the connecting bolts 8, and control the torque at 3-5 N·m to ensure that the compression of the sealing ring 6 is 1-1.5 mm, thus achieving a seal.

[0044] Connect the inlet and return oil pipes of the miniature hydraulic cylinder 20 to the hydraulic pump station via quick connectors. The hydraulic pump station is connected to the external control system via wires. The wires pass through the pre-set wiring holes inside the lawnmower handle. After the connection is completed, test the circuit continuity and the hydraulic pipeline sealing to ensure there is no oil leakage or open circuit.

[0045] The micro hydraulic cylinder 20 is operated to extend and retract by an external control system. The correspondence between the stroke of the telescopic rod 19 and the moving distance of the slider 17 is recorded to ensure that the slider 17 can move smoothly on the slide rod 16, with a moving range covering a stroke of 50mm. When stopped at any position, the fixed magnetic block 18 and the movable magnetic block 22 can accurately engage, with a positioning deviation of ≤0.5mm.

[0046] Place the assembled mower head into a container with a water depth of 300mm and keep it in the water for 10 minutes. After taking it out, disassemble it to check whether water has entered inside. At the same time, use compressed air to blow air from the outside into the gaps such as the heat dissipation hole and the cable outlet 4 to check whether airflow has entered inside and ensure that the sealing performance meets the standards.

[0047] Insert a 3mm diameter nylon mowing line into the conduit 24, start the mower to simulate working conditions at a speed of 3000r / min, run it continuously for 1 hour, and observe whether there is abnormal wear or loosening of each component of the adjustment mechanism, whether the mowing line slips, and whether the micro hydraulic cylinder 20 can stably maintain the extension and retraction position.

[0048] Working principle: When it is necessary to adjust the mowing height, the operator sends a command to the miniature hydraulic cylinder 20 through the external control system at the mower handle. After receiving the signal, the hydraulic pump station introduces high-pressure oil into the rodless chamber of the miniature hydraulic cylinder 20, pushing the piston to extend the telescopic rod 19; or introduces high-pressure oil into the rod chamber, pulling the piston to retract the telescopic rod 19.

[0049] The telescopic rod 19 is fixedly connected to the slider 17. The telescopic movement of the telescopic rod 19 is directly converted into the linear movement of the slider 17 along the slide rod 16. Since the slide rod 16 is fixed in the through groove 15 of the adjusting frame 14, and the direction of the through groove 15 is consistent with the radial direction of the mowing head, the movement of the slider 17 will change the radial position of the threaded tube 24 in the mowing head, thereby adjusting the length of the mowing line extending out of the outlet 4 in the threaded tube 24. When the slider 17 moves to the outside of the mowing head, the length of the mowing line extends, and the mowing height increases; when the slider 17 moves to the inside of the mowing head, the length of the mowing line extends shortens, and the mowing height decreases.

[0050] When slider 17 moves to the target position, the external control system stops supplying oil to the micro hydraulic cylinder 20, and the hydraulic system locks the oil circuit through a one-way valve, keeping the telescopic rod 19 at its current length and initially fixing the position of slider 17. The fixed magnetic block 18 on one side of slider 17 and the movable magnetic block 22 in the fixed box 21 on the adjusting frame 14 attract each other due to their opposite magnetic properties. Under the attraction, the movable magnetic block 22 compresses the return spring 23 and moves closer to the fixed magnetic block 18 until they are attracted together. The elastic force of the return spring 23 acts in the opposite direction on the movable magnetic block 22, making the attraction between the fixed magnetic block 18 and the movable magnetic block 22 tighter, forming auxiliary positioning, effectively counteracting the radial tension generated when the mowing line rotates at high speed, preventing slider 17 from shifting during operation, and ensuring stable mowing height.

Claims

1. A height-adjustable mower head, comprising a cover plate (1) and a base (2) connected to the bottom of the cover plate (1), characterized in that: The base (2) has a cable outlet (4) on its side, and a flap (3) is hinged to the side of the base (2) by a hinge. An adjustment mechanism is provided inside the cable outlet (4). The adjustment mechanism includes an adjustment frame (14), a through groove (15), a slide rod (16), a slider (17), a fixed magnet (18), a telescopic rod (19), a miniature hydraulic cylinder (20), a fixed box (21), a movable magnet (22), a return spring (23), a conduit (24), and an anti-slip sleeve (25). The adjustment frame (14) is fixedly connected to the inner wall of the outlet (4). The through groove (15) is opened on the outer surface of the adjustment frame (14). The slide rod (16) is fixedly connected to the inside of the through groove (15). The slider (17) is slidably connected to the outer surface of the slide rod (16). The fixed magnet (18) is fixedly connected to the inner wall of the outlet (4). On one side of the slider (17), the telescopic rod (19) is fixedly connected to the top of the slider (17), the micro hydraulic cylinder (20) is installed on the top of the telescopic rod (19), the fixed box (21) is fixedly connected to the outer surface of the adjusting frame (14), the reset spring (23) is fixedly connected to the inner wall of the fixed box (21), the movable magnetic block (22) is fixedly connected to the end of the reset spring (23) away from the inner wall of the fixed box (21), the threading tube (24) is fixedly connected to the other side of the slider (17), the threading tube (24) has a threading hole inside, and the anti-slip sleeve (25) is fixedly connected to the inner wall of the threading hole.

2. The lawn mowing head with adjustable mowing height according to claim 1, characterized in that: The inner wall of the cover plate (1) is fixedly connected to a partition chamber (7), the adjustment mechanism is set inside the partition chamber (7), the upper surface of the partition chamber (7) is provided with a positioning hole (9), the bottom of the cover plate (1) is fixedly connected to a positioning column (10), and the positioning column (10) and the partition chamber (7) are connected by a locking bolt (11).

3. The lawn mowing head with adjustable mowing height according to claim 2, characterized in that: The inner wall of the compartment (7) is threaded with a connecting bolt (8), the top of the compartment (7) is connected with a sealing ring (6), the top center of the cover plate (1) is provided with an upper cover (5), the lower surface of the upper cover (5) is provided with bolt holes, and the bolt holes are threadedly connected to the connecting bolt (8).

4. A lawn mowing head with adjustable mowing height according to claim 2, characterized in that: A sealing plate (12) is fixedly connected to the bottom of the inner wall of the base (2), and a telescopic spring (13) is fixedly connected to the bottom center of the partition compartment (7).

5. A lawn mowing head with adjustable mowing height according to claim 1, characterized in that: The top of the micro hydraulic cylinder (20) is fixedly connected to the bottom of the inner wall of the cover plate (1), the output end of the micro hydraulic cylinder (20) is fixedly connected to the top of the telescopic rod (19), and the micro hydraulic cylinder (20) is electrically connected to the external control system, which can control the extension length of the telescopic rod (19).

6. A lawn mowing head with adjustable mowing height according to claim 1, characterized in that: The fixed magnetic block (18) and the movable magnetic block (22) have opposite surface magnetism. When the slider (17) moves to a specific position, the fixed magnetic block (18) and the movable magnetic block (22) attract each other. With the elastic force of the reset spring (23), the slider (17) is positioned in an auxiliary manner.

7. A lawn mowing head with adjustable mowing height according to claim 1, characterized in that: The anti-slip sleeve (25) is made of rubber and has anti-slip texture on its inner wall, which can increase the friction between the mowing line and the threading tube (24).

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