Cutter head of mowing machine

Abstract

The utility model discloses a mowing machine cutterhead which comprises a cutterhead body, a cutterhead cover is detachably installed on the top of the cutterhead body, and four sets of cutting assemblies used for mowing are arranged in the cutterhead body in an annular array mode. The cutting assembly comprises a sliding block, the sliding block is installed in the cutter head body in a sliding mode, a cutting blade which extends outwards under the action of centrifugal force when the cutter head body rotates is detachably installed on the sliding block, and through the arrangement of the cutting mechanism, the blade is in a contracted state when the blade is not used, and on the contrary, when the blade is used, the blade is in a contracted state. A cutting blade in the cutting mechanism extends outwards under the action of centrifugal force to form a cutting radius, so that the grass clippings removing efficiency during high-speed operation is ensured, and the risk of mistaken touch in a static state is avoided; the clamping part of the cutting blade is installed in the installation groove in the sliding block, the clamping part is clamped through the clamping groove in the bottom of the clamping plate, the clamping plate is fixedly installed in the assembly groove through cooperation of the hexagon socket screws, and then the cutting blade is convenient to replace after being abraded or rusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the lawn mower technical field, concretely is a lawn mower cutterhead. BACKGROUND

[0002] The lawn mower is a mechanical tool for trimming vegetation such as lawns, and the lawn mower is mainly composed of a cutterhead, an engine, blades and the like, wherein the blades of the existing lawn mower are usually in a locking structure on the cutterhead, so that the blades cannot be adjusted in extension.

[0003] The existing cutterhead blades are mostly fixedly installed, so the blades of the lawn mower are always exposed, and the blades that are extended outside when not in use can easily scratch people, and the blades will be worn or corroded after long-time use of the cutterhead, so that the replacement of the fixedly installed cutterhead blades is more complex and inconvenient, and therefore we need to propose a lawn mower cutterhead. UTILITY MODEL CONTENT

[0004] The utility model discloses a lawn mower cutterhead, through the setting of cutting mechanism, when not in use, the blade belongs to the shrinkage state, contrarily when using, cutting blade is extended outward under the action of centrifugal force, through the installation of the clamping portion of cutting blade in the installation groove on the sliding block, the clamping portion is clamped to the bottom clamping groove of the clamping plate, the clamping plate is installed and fixed in the assembly groove through the cooperation of the internal hexagonal bolt, and then the cutting blade is convenient to replace after wearing or corrosion, so that the problems in the above background are solved.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A lawn mower cutterhead, comprising a cutterhead main body, a disc cover is detachably installed at the top of the cutterhead main body, and four groups of cutting assemblies for mowing are arranged in an annular array in the cutterhead main body.

[0007] The cutting assembly comprises a sliding block, the sliding block is slidably installed in the inside of the cutterhead main body, a cutting blade that is extended outward under the action of centrifugal force when the cutterhead main body rotates is detachably installed on the sliding block, one end of the cutting blade penetrates through the cutterhead main body and is located on the outside of the cutterhead main body, a return spring that provides a reverse rebound force is fixedly installed on one side of the sliding block, one end of the return spring is fixedly connected with a fixed plate, and the fixed plate is fixedly installed on the inner bottom of the cutterhead main body.

[0008] Preferably, a guide rod is slidably inserted into the two sides of the return spring, one end of the guide rod is fixedly connected with the inner side wall of the cutterhead main body, and the other end of the guide rod is fixedly connected with one side of the fixed plate.

[0009] Preferably, a mounting slot is formed in the middle of the top of the sliding block, one end of the cutting blade is provided with a clamping portion, the clamping portion is mounted in the inside of the mounting slot, and a clamping plate for fixing the clamping portion is mounted on the top of the mounting slot.

[0010] Preferably, assembly grooves are formed in the two sides of the mounting slot, the two ends of the clamping plate are located in the two assembly grooves respectively, and a clamping block for clamping a middle clamping groove of the clamping portion is fixedly connected to the middle of the bottom of the clamping plate.

[0011] Preferably, the two ends of the clamping plate are provided with inner hexagonal bolts, one end of the inner hexagonal bolt is threadedly connected to the inner bottom of the assembly groove through the clamping plate.

[0012] Preferably, a blade groove corresponding to the cutting blade is formed in the side wall of the cutter main body, and the outer wall of the cutting blade is in sliding connection with the inner wall of the blade groove.

[0013] Preferably, a connecting shaft for connecting the mower driving device is fixedly mounted in the middle of the inner bottom of the cutter main body, and the connecting shaft extends to above the disc cover through the disc cover.

[0014] Preferably, a through hole for the connecting shaft to pass through is formed in the middle of the disc cover, and not less than four groups of locking bolts are arranged in an annular array between the disc cover and the top of the cutter main body.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1. When the cutting mechanism is not used, the cutting blade is in a retracted state, and when the cutting mechanism is used, the cutting blade in the cutting mechanism is stretched outwards under the action of centrifugal force to form a cutting radius, so that the grass clippings removal efficiency during high-speed operation is ensured, and the risk of accidental touch in the static state is avoided.

[0017] 2. The clamping portion of the cutting blade is mounted in the mounting slot of the sliding block, the clamping portion is clamped by the clamping groove in the bottom of the clamping plate, and the clamping plate is mounted and fixed in the assembly groove by the cooperation of the inner hexagonal bolts, so that the cutting blade can be easily replaced when it is worn or corroded. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a side view of the three-dimensional structure of the utility model;

[0019] Figure 2 It is a structure diagram of the inside of the cutter main body and the disc cover of the utility model;

[0020] Figure 3 It is a structure diagram of the cutting assembly of the utility model;

[0021] Figure 4The utility model discloses a cutting blade and sliding block structure schematic view.

[0022] In the drawing: 1, cutter head main body, 2, disc cover, 3, locking bolt, 4, connecting shaft, 5, cutting assembly, 51, sliding block, 511, mounting groove, 512, clamping plate, 513, internal hex bolt, 514, assembly groove, 52, cutting blade, 521, clamping part, 53, return spring, 54, fixed plate, 55, guide rod, 6, through hole, 7, blade slot. DETAILED DESCRIPTION

[0023] The utility model discloses an embodiment of the utility model, with the drawing in the embodiment of the utility model, the technical scheme in the embodiment of the utility model is clearly and completely described, obviously, the described embodiment is only a part of embodiment of the utility model, but not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0024] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0025] A mower cutter head, including cutter head main body 1, the top of cutter head main body 1 is detachably installed with disc cover 2, and four groups of cutting assemblies 5 for mowing are arranged in the form of annular array in cutter head main body 1.

[0026] Cutter head main body 1 adopts lightweight aluminum alloy casting, and disc cover 2 is realized quick disassembly and assembly through locking bolt 3; the modular disc cover design is convenient for internal component maintenance; the annular array cutting assembly 5 ensures that mowing coverage has no dead angle and improves work efficiency;

[0027] The cutting assembly 5 includes a sliding block 51, which is slidingly installed in the interior of the cutter head main body 1. A cutting blade 52, which is detachably installed on the sliding block 51, extends outward under the action of centrifugal force when the cutter head main body 1 rotates. One end of the cutting blade 52 penetrates the cutter head main body 1 and is located on the outside of the cutter head main body 1. A return spring 53, which provides a reverse rebound force, is fixedly installed on one side of the sliding block 51. One end of the return spring 53 is fixedly connected with a fixed plate 54, which is fixedly installed on the inner bottom of the cutter head main body 1.

[0028] When the cutter head main body 1 rotates at a high speed, the cutting blade 52 extends outward along the blade slot 7 under the action of centrifugal force, and the cutting radius self-adaptively increases. The centrifugal force drives without the need for an additional power mechanism, thereby reducing energy consumption.

[0029] Further, the sliding block 51 is slidingly inserted with a guide rod 55 on both sides of the return spring 53. One end of the guide rod 55 is fixedly connected with the inner side wall of the cutter head main body 1, and the other end of the guide rod 55 is fixedly connected with one side of the fixed plate 54.

[0030] The sliding block 51 and the surface of the guide rod 55 are coated with a Teflon coating, the guide rod 55 is arranged parallel to the movement direction of the sliding block 51, and the sliding block 51 is limited to move only in the axial direction; the Teflon coating reduces the friction coefficient of the sliding contact surface, the double guide rod 55 structure prevents the sliding block 51 from yawing, and guarantees the accurate extension and retraction trajectory of the cutting blade 52; the Teflon coating reduces wear and avoids movement failure caused by grass clippings.

[0031] Further, the top of the sliding block 51 is provided with a mounting groove 511, one end of the cutting blade 52 is provided with a clamping portion 521, the clamping portion 521 is mounted in the inside of the mounting groove 511, and the top of the mounting groove 511 is provided with a clamping plate 512 for fixing the clamping portion 521.

[0032] Further, the sliding block 51 is provided with an assembly groove 514 on both sides of the mounting groove 511, both ends of the clamping plate 512 are located in the inside of the two assembly grooves 514, and the bottom of the clamping plate 512 is fixedly connected with a clamping block clamped in the middle clamping groove of the clamping portion 521.

[0033] The clamping portion 521 and the mounting groove 511 adopt an interference fit, the clamping plate 512 is embedded in the middle clamping groove of the clamping portion 521 through the clamping block, forming a bidirectional locking, and the clamping structure realizes convenient replacement of the cutting blade without the need for special tools; at the same time, the bidirectional locking avoids the loosening and falling of the blade during high-speed rotation.

[0034] Further, both ends of the clamping plate 512 are provided with an inner hexagonal bolt 513, one end of the inner hexagonal bolt 513 is threadedly connected to the inner bottom of the assembly groove 514 through the clamping plate 512.

[0035] The inner hexagonal bolt 513 applies a pre-tightening force to press the clamping plate 512 against the clamping portion 521, and the thread glue is coated to prevent vibration loosening, the bolt and the clamping block double fixation improve the connection reliability of the cutting blade 52; the assembly groove 514 guides the accurate positioning of the inner hexagonal bolt 513, reducing the installation error.

[0036] Further, the side wall of the cutter head body 1 is provided with a blade groove 7 corresponding to the cutting blade 52, and the outer wall of the cutting blade 52 is slidably connected with the inner wall of the blade groove 7.

[0037] The width of the blade groove 7 is 0.2-0.5mm larger than the thickness of the cutting blade 52, which ensures smooth sliding and reduces grass clippings blockage, the inner wall of the blade groove 7 is polished, and the edge is rounded to avoid hooking when cutting grass stems, and the precise gap control takes into account the flexible extension and retraction of the cutting blade 52 and low resistance movement; the polished chamfer design further reduces the risk of grass clippings residue.

[0038] Further, the connecting shaft 4 for connecting the mower driving device is fixedly installed at the center of the bottom of the cutter head body 1, and the top of the connecting shaft 4 extends to the upper side of the disc cover 2 through the disc cover 2.

[0039] The coaxiality tolerance of the connecting shaft 4 and the cutter head body 1 is less than or equal to 0.03 mm, the connecting shaft 4 is made of quenched steel, and the coaxiality is ensured by numerical control lathe and integral machining of the cutter head body 1, so that the eccentric vibration of the cutter head body 1 is reduced, and the running stability is improved; the integral machining process enhances the structural strength and adapts to high-speed heavy-load working conditions.

[0040] Further, the disc cover 2 is provided with a through hole 6 for the connecting shaft 4, and the disc cover 2 and the top of the cutter head body 1 are arranged in an annular array and are provided with not less than four groups of locking bolts 3.

[0041] The locking bolts 3 are made of rust-proof stainless steel, the through hole 6 and the connecting shaft 4 are gap matched (0.1-0.3 mm), the disc cover 2 is allowed to be independently disassembled, the multi-bolt annular locking ensures the sealing property of the disc cover 2, and the grass clippings are prevented from invading; the gap matching design realizes the independent maintenance of the disc cover 2, and the connecting shaft 4 does not need to be removed.

[0042] Working principle: when the mower driving device drives the cutter head body 1 to rotate at high speed through the connecting shaft 4, the cutting blade 52 in the cutting assembly 5 is stretched outward under the action of centrifugal force, at this time, the reset spring 53 is stretched, the guide rod 55 reduces the friction resistance through the Teflon coating, ensures the linear motion of the sliding block 51, avoids the deflection of the cutting blade 52, makes the cutting blade 52 slide along the blade groove 7 to the maximum cutting radius position, forms an annular cutting area, and conversely, when not in use, the cutting blade 52 is reset and retracted into the blade groove 7 through the reset spring 53.

[0043] When the cutting blade 52 needs to be replaced, after the disc cover 2 is disassembled through the locking bolt 3, the inner hexagonal bolts 513 at both ends of the clamping plate 512 are loosened, the locking of the clamping part 521 is released, and the worn cutting blade 52 can be quickly pulled out; the new blade is inserted into the installation groove 511 through the clamping structure, and the replacement is completed after the inner hexagonal bolts 513 are locked.

[0044] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A lawnmower blade, characterized in that, include: Cutter head body (1); The top of the blade body (1) is detachably fitted with a disc cover (2), and four sets of cutting components (5) for mowing grass are arranged in a circular array inside the blade body (1). The cutting assembly (5) includes a sliding block (51), which is slidably installed inside the cutter head body (1). A cutting blade (52) is detachably installed on the sliding block (51) and extends outward under centrifugal force when the cutter head body (1) rotates. One end of the cutting blade (52) penetrates the cutter head body (1) and is located on the outside of the cutter head body (1). A return spring (53) providing reverse rebound force is fixedly installed on one side of the sliding block (51). A fixing plate (54) is fixedly connected to one end of the return spring (53), and the fixing plate (54) is fixedly installed on the inner bottom of the cutter head body (1).

2. The lawnmower blade according to claim 1, characterized in that: The sliding block (51) is slidably inserted with guide rods (55) on both sides of the reset spring (53). One end of the guide rod (55) is fixedly connected to the inner wall of the cutter head body (1), and the other end of the guide rod (55) is fixedly connected to one side of the fixing plate (54).

3. The lawnmower blade according to claim 1, characterized in that: The sliding block (51) has a mounting groove (511) at the center of its top. One end of the cutting blade (52) has a snap-fit ​​part (521). The snap-fit ​​part (521) is installed inside the mounting groove (511). A snap-fit ​​plate (512) for fixing the snap-fit ​​part (521) is installed on the top of the mounting groove (511).

4. A lawnmower blade according to claim 3, characterized in that: The sliding block (51) has assembly slots (514) on both sides of the mounting slot (511). The two ends of the snap-fit ​​plate (512) are located inside the two sets of assembly slots (514), and a snap-fit ​​block is fixedly connected to the center of the bottom of the snap-fit ​​plate (512) and snap-fits into the middle slot of the snap-fit ​​part (521).

5. A lawnmower blade according to claim 4, characterized in that: Both ends of the snap-fit ​​plate (512) are provided with hexagon socket bolts (513), one end of which passes through the snap-fit ​​plate (512) and is threaded to the bottom of the assembly groove (514).

6. A lawnmower blade according to claim 1, characterized in that: The side wall of the cutter body (1) is provided with a blade groove (7) corresponding to the cutting blade (52), and the outer wall of the cutting blade (52) is slidably connected to the inner wall of the blade groove (7).

7. A lawnmower blade according to claim 1, characterized in that: A connecting shaft (4) for connecting a lawnmower drive device is fixedly installed at the center of the bottom of the cutter body (1). The top of the connecting shaft (4) extends through the disc cover (2) to the top of the disc cover (2).

8. A lawnmower blade according to claim 7, characterized in that: The disc cover (2) has a through hole (6) at the center for the connecting shaft (4) to pass through, and at least four sets of locking bolts (3) are arranged in a ring array between the top of the disc cover (2) and the cutter head body (1).

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