WO2024000741A1

WO2024000741A1 - Cutting disc assembly and lawn mower having same

Info

Publication number: WO2024000741A1
Application number: PCT/CN2022/111419
Authority: WO
Inventors: 林永明
Original assignee: 万维研无线动力（香港）有限公司
Priority date: 2022-07-01
Filing date: 2022-08-10
Publication date: 2024-01-04
Also published as: CN115004952A

Abstract

Provided is a cutting disc assembly, comprising a circular cutting disc (10), blade assemblies (20) and sealing assemblies (30), wherein each blade assembly (20) comprises a rotating shaft (21), a cutter holder (22), a blade (23) and an elastic element (24); and each sealing assembly (30) comprises a first sealing member (31) provided between the circular cutting disc (10) and the cutter holder (22), and a second sealing member (32) provided between the blade (23) and the rotating shaft (21). The provided cutting disc assembly comprises the circular cutting disc (10) and the blade assemblies (20), wherein the cutter holder and the blade of each blade assembly (20) are fixedly connected into a whole, and the circular cutting disc (10) and the cutter holders are in drive connection by means of the elastic elements (24), so that the cutter holders (22) and the blades (23) are driven to synchronously rotate during rotation of the circular cutting disc (10); and the sealing assemblies (30) are provided between the circular cutting disc (10) and the blade assemblies (20), and the risk of the circular cutting disc (10) and the blade assemblies (20) being unable to rotate due to blockage caused by debris therebetween is reduced by means of the sealing assemblies (30), thereby prolonging the service life of the whole cutting disc assembly, and also reducing the frequency of maintaining and replacing blades during use of the cutting disc assembly. Also provided is a lawn mower.

Description

A cutterhead assembly and a lawnmower having the cutterhead assembly

Technical field

The present invention relates to the technical field of lawn mowing equipment, and in particular, to a cutter head assembly and a lawn mower having the cutter head assembly.

Background technique

A lawnmower, also known as a weeder, lawnmower, or grass trimmer, is an automated garden tool used to mow lawns, maintain lawns, and vegetation. It can mow and maintain lawns in home courtyards, public green spaces, and other places. A lawn mower is generally composed of a cutterhead assembly, a blade, an engine, a moving device, a control device and other components. The cutterhead assembly is fixed on the bottom of the moving device, and the blade is fixed on the bottom of the cutterhead assembly. Most lawn mowers currently on the market use a screw to fix the blade to the cutterhead assembly, and then drive the engine on the cutterhead assembly to rotate the cutterhead assembly, thereby driving the blades on the cutterhead assembly to rotate at high speed. To achieve the purpose of mowing grass. This simple screw fixation method makes the blade easily clogged and unable to rotate during actual use.

When the lawn mower is cutting grass, dust, soil, grass clippings and other impurities are easily generated near the cutterhead assembly. These impurities will fly with the high-speed rotation of the cutterhead assembly and enter the gap between the blade and the cutterhead assembly. Over time, the gap between the blade and the cutterhead assembly becomes clogged with impurities, causing the blade to be unable to rotate normally. The inability of the blade to rotate will have a series of negative effects on the lawn mower. First, during the mowing process, if the blade encounters hard objects such as stones in the lawn, the blade will not be able to avoid the hard objects by rotating in the opposite direction, causing the blade to be damaged or blunt, thereby affecting the cutting effect. In severe cases, the fragments generated by the blade colliding with hard objects will fly with the high-speed operation of the cutterhead assembly, posing a risk of injury; second, during the mowing process, the blade is blocked at the bottom of the cutterhead assembly, causing the blade to During the cutting process, the cutting function cannot be extended normally and the cutting effect is lost. It is necessary to regularly and frequently check the usage status of the blade to ensure the normal use of the lawn mower.

Contents of the invention

The purpose of the present invention is to solve the shortcoming of the existing lawn mower that the blade and the cutterhead assembly are fixed with simple screws, causing the blade to be easily blocked by impurities and unable to rotate normally, thereby causing a negative impact on the lawn mower, and provide A cutter head assembly.

The technical solution adopted by the present invention to solve the technical problem is: a cutterhead assembly, which includes a circular cutterhead, a plurality of blade assemblies evenly distributed on the circular cutterhead along the circumference, and a cutterhead assembly arranged on the circular cutterhead. a sealing component between the disk and the blade assembly; the blade assembly includes a rotating shaft fixed on the bottom of the circular cutterhead, a knife seat sleeved on the rotating shaft, a blade fixed on the bottom of the knife seat; An elastic element that drives the circular cutterhead and the cutter seat; the sealing assembly includes a first sealing member disposed between the circular cutterhead and the cutter seat; and a first sealing member disposed between the blade and the cutter seat. A second seal between the rotating shafts.

In one embodiment, the bottom surface of the circular cutterhead is provided with several installation positions for fixing the blade assembly. The installation positions are provided in one-to-one correspondence with the blade assembly. The installation positions include: A circular mounting groove is provided on the bottom surface of the circular cutterhead surrounding the cutter seat, and a central hole is provided in the circular mounting groove to fix the rotating shaft.

In one embodiment, the tool holder includes a base, a through hole provided at the center of the base for the rotating shaft to pass through, and a first hole provided on the top of the base to fix the elastic element. A mounting slot and a second mounting slot provided at the bottom of the base for fixing the blade.

In one embodiment, the first sealing member is an elastic sealing ring disposed between the base and the circular mounting groove, and the base is embedded in one end of the circular mounting groove. An annular groove for fixing the elastic sealing ring is provided on the side.

In one embodiment, the blade is provided with a rotation hole for the rotation shaft to pass through, and the second sealing member includes a seal that is passed through the rotation hole of the blade and locked to the bottom of the rotation shaft. A fastener and an annular elastic gasket disposed between the fastener and the blade.

In one embodiment, the elastic element includes an elastic body and a first fixed end and a second fixed end located on both sides of the elastic body. The elastic body is sleeved in the first installation groove of the tool holder. .

In one embodiment, the mounting position of the circular cutter head further includes a first mounting hole disposed in the circular mounting groove for fixing the elastic element, and the first mounting groove of the cutter holder is further provided with a first mounting hole. There is a second mounting hole for fixing the elastic element, the first fixed end is inserted into the first mounting hole of the mounting position, and the second fixed end is inserted into the second mounting hole of the tool holder.

In one embodiment, the tool holder further includes a positioning protrusion disposed on the top of the base, and an arc-shaped sliding groove for the positioning protrusion to be inserted is provided in the circular installation groove of the mounting position. The groove is provided with limiting portions at both ends of the arc-shaped sliding groove that are in contact with the side surfaces of the positioning protrusion.

In one embodiment, the blade assembly further includes a sleeve disposed in the cutter base and sleeved on the rotating shaft, and a through hole in the base includes a sleeve that communicates with the top surface of the base. The first stepped hole and the second stepped hole communicated with the bottom surface of the base, and the shaft sleeve is arranged in the first stepped hole.

In one embodiment, the second installation groove is a U-shaped groove provided on the bottom surface of the base, one end of the blade is embedded in the U-shaped groove, and the other end is formed by the U-shaped groove. Stick out of the opening.

In one embodiment, the blade can extend out of the circular cutterhead by a length of 5 mm to 40 mm.

The beneficial effect of the cutterhead assembly provided by the present invention is that it includes a circular cutterhead and a blade assembly, in which the cutter seat and the blade in the blade assembly are fixedly connected as a whole, and the circular cutterhead and the cutter seat are transmission connected through elastic elements. , so that when the circular cutterhead rotates, it drives the cutter holder and the blade to rotate synchronously; when the blade encounters an obstacle, the blade and the cutter holder can also rotate in reverse around the axis of rotation to avoid the obstacle; at the same time, the circular cutterhead and blade assembly There is a sealing component between them. The sealing component reduces the risk of being blocked by debris between the circular cutterhead and the blade assembly, thereby extending the service life of the entire cutterhead assembly and reducing maintenance during use. and frequency of blade replacement.

The invention also provides a lawn mower, including the above-mentioned cutter head assembly and an engine driving the cutter head assembly.

The beneficial effect of the lawn mower provided by the present invention is that the use of the above-mentioned cutterhead assembly can reduce the risk of being blocked by debris between the blade assembly and the circular cutterhead, thereby prolonging the life of the entire cutterhead assembly. The service life can also reduce the frequency of regular maintenance of the lawn mower during use.

Description of drawings

Figure 1 is a schematic three-dimensional exploded structural view of a cutterhead assembly provided by the present invention;

Figure 2 is a schematic three-dimensional structural diagram of a cutterhead assembly provided by the present invention when the blade assembly is fully extended;

Figure 3 is a schematic three-dimensional structural diagram of the blade assembly in a cutterhead assembly provided by the present invention when it is fully folded;

Figure 4 is a full cross-sectional view of a single blade assembly in a cutterhead assembly provided by the present invention when it is connected to a circular cutterhead;

Figure 5 is a schematic three-dimensional structural diagram of an elastic element in a cutterhead assembly provided by the present invention;

Figure 6 is a schematic three-dimensional structural diagram of a circular cutterhead in a cutterhead assembly provided by the present invention;

Figure 7 is a partial enlarged view of position A in Figure 6;

Figure 8 is a schematic three-dimensional structural diagram of a cutter seat in a cutterhead assembly provided by the present invention;

Figure 9 is a full cross-sectional view of a cutter seat in a cutter head assembly provided by the present invention;

Figure 10 is a schematic three-dimensional structural diagram of a blade in a cutterhead assembly provided by the present invention;

Figure 11 is a schematic three-dimensional structural diagram of a lawn mower provided by the present invention.

Explanation of reference symbols:

100-cutterhead assembly, 200-lawn mower, 210-engine drive rod;

10-circular cutterhead, 11-mounting position, 111-circular mounting groove, 112-center hole, 112-first mounting hole, 114-arc sliding groove, 115-limiting part;

20-blade assembly, 21-rotating shaft, 211-vertical connection, 212-fixing piece, 22-knife holder, 221-base, 2211-annular groove, 2212-positioning protrusion, 222-through hole, 2221- First step hole, 2222-second step hole, 223-first installation slot, 2231-second installation hole, 224-second installation slot, 2241-parallel side, 2242-arc side, 225-fixing hole , 226-positioning post, 23-blade, 231-rotation hole, 232-connection hole, 233-positioning hole, 24-elastic element, 241-elastic body, 242-first fixed end, 243-second fixed end, 25 -Shaft sleeve, 26-locking piece;

30-seal component, 31-first seal, 32-second seal, 321-fastener, 322-annular elastic gasket;

L1 - The length that the blade can extend out of the circular cutterhead.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Referring to Figures 1 to 10, a cutter head assembly 100 provided by the present invention is shown. The cutter head assembly 100 is suitable for use in a series of automated lawn maintenance equipment such as lawn mowers 200, weed eaters, lawn mowers, etc., and can provide effective cutting parts for the maintenance equipment to achieve the purpose of mowing the lawn.

As shown in FIGS. 1 to 3 , a cutterhead assembly 100 provided by the present invention includes a circular cutterhead 10 and a plurality of blade assemblies 20 evenly distributed on the circular cutterhead 10 along the circumference. The center of the circular cutterhead 10 is provided with a mounting hole fixedly connected to a driving component, and the high-speed rotation of the circular cutterhead 10 is achieved through the driving component. There are several blade assemblies 20 evenly distributed on the outer circumferential surface of the circular cutterhead 10. The number of the blade assemblies 20 can be increased or decreased according to actual needs. Generally, at least three blade assemblies 20 are provided. The horizontal angle between them is 120°. In this embodiment, as shown in FIG. 2 , six blade assemblies 20 are provided on the circular blade 10 at the same time, and the horizontal included angle between adjacent blade assemblies 20 is 60°. The larger the size of the circular cutterhead 10, the greater the number of blade assemblies 20 provided on the circular blade 10, and the larger the cutting range thereof. As shown in FIG. 2 , in the initial state, the blade 23 of the blade assembly 20 completely extends out of the outer circumferential surface of the circular cutterhead 10 and performs cutting as the circular cutterhead 10 rotates at high speed. When the circular cutterhead 10 encounters a hard obstacle while the circular cutterhead 10 is moving, the blade assembly 20 will rotate in the opposite direction to the rotation direction of the circular cutterhead 10 , causing the blade assembly 20 to completely rotate into the The bottom of the circular cutterhead 10 is shown in Figure 3 to avoid hard obstacles. When the blade assembly 20 leaves the obstacle, the blade assembly 20 will rotate along the rotation direction of the circular cutterhead 10 again due to the elastic drive of the elastic element 24 inside the blade assembly 20, and the blade 23 will extend out of the circular cutterhead. 10's exterior. In this way, through the relative rotation between the blade assembly 20 and the circular cutterhead 10, the service life of the blade assembly 20 and the safety of the cutterhead assembly 100 can be greatly improved, and the damage of the blade assembly 20 when exposed to hard objects can be avoided as much as possible. Or dulling issues.

As shown in FIGS. 1-3 , the cutterhead assembly 100 provided by the present invention also includes a sealing component 30 disposed between the circular cutterhead 10 and the blade assembly 20 . The sealing component 30 is disposed on the circular cutterhead 10 There is a gap between the blade assembly 20 and the blade assembly 20 in the vertical direction, that is, the gap where the sealing assembly 30 is distributed is in a direction perpendicular to the rotation direction of the cutterhead. Through the arrangement of the sealing assembly 30, the dust, soil, and grass clippings generated by cutting weeds during the high-speed rotation of the circular cutterhead 10 can be effectively reduced from entering between the blade assembly 20 and the circular cutterhead 10. Within the installation gap, the problem of the blade assembly 20 being unable to rotate due to the installation gap being filled with impurities is avoided as much as possible, and the frequency of manual regular maintenance of the cutterhead assembly 100 is reduced.

As shown in FIG. 4 , it is a full cross-sectional view of the blade assembly 20 and the circular cutterhead 10 in the cutterhead assembly 100 provided by the present invention. The blade assembly 20 provided by the present invention includes a rotating shaft 21 fixed on the bottom of the circular cutterhead 10, a cutter seat 22 sleeved on the rotating shaft 21, a blade 23 fixed on the bottom of the cutter seat 22, and the circular cutterhead 10 and the cutter. The elastic element 24 is drivingly connected to the seat 22 . The rotating shaft 21 in the blade assembly 20 is fixedly connected to the circular cutterhead 10 . In this embodiment, the vertical connecting portion 211 at the top of the rotating shaft 21 passes through the circular blade 10 and is fixedly connected to the fixing member 212. The vertical connecting portion 211 is provided with external threads, and the fixing member 212 is a bolt. The top of the rotating shaft 21 is directly locked on the circular cutterhead 10 through bolts, so that the rotating shaft 21 and the circular cutterhead 10 are fixedly connected, and the rotating shaft 21 and the circular cutterhead 10 are integrated. The knife holder 22 is sleeved on the rotating shaft 21 , and the blade 23 is fixed at the bottom of the knife holder 22 so that the knife holder 22 and the blade 23 are integrated, and the knife holder 22 drives the blade 23 to rotate horizontally relative to the rotating shaft 21 . In the blade assembly 20 , the blade 23 is fixedly connected to the blade holder 22 and can rotate horizontally relative to the rotating shaft 21 as the blade holder 22 rotates. The elastic element 24 disposed between the circular cutterhead 10 and the cutter seat 22 provides greater support force for the cutter seat 22 and transmits the support force to the blade 23 through the cutter seat 22, thereby lifting the blade 23 cutting force on. The arrangement of the elastic element 24 allows the cutter seat 22 to not only receive the rotational acceleration force generated by the rotation of the circular cutterhead 10 during the high-speed rotation of the circular cutterhead 10 , but also simultaneously receive the elastic force provided by the elastic element 24 , two forces act on the knife seat 22 at the same time, and are transmitted to the blade 23 fixedly connected with the knife seat 22, so that the cutting force of the blade 23 is greater and the cutting effect is better. When the blade assembly 20 rotates at high speed with the circular cutterhead 10 and the blade 23 contacts a hard obstacle, the obstacle will form resistance to the blade 23. Only when this resistance is greater than the centrifugal force and the elastic element of the circular cutterhead 10 24 When the sum of these two forces is combined, the blade 23 will drive the blade holder 22 to rotate around the rotating axis 21 in the opposite direction of the rotation of the circular cutterhead 10 along with this resistance, thereby achieving the avoidance of hard obstacles by the blade assembly 20. At this time, the elastic element 24 will not hinder the synchronous reverse rotation of the tool holder 22 and the blade 23 . After the blade assembly 20 leaves the obstacle, the blade assembly 20 will rotate again along the rotating shaft 21 along the rotation direction of the circular cutterhead 10 with the restoring force of the elastic element 24. At this time, the blade assembly 20 The blade 23 will again protrude from the bottom of the circular cutterhead 10 .

At the same time, in the cutterhead assembly 100 provided by the present invention, the blade assembly 20 is provided with an elastic element 24 that is driven and connected between the circular cutterhead 10 and the cutter seat 22. The elastic element 24 supports the cutter seat 22 and the blade 23. It acts as an elastic support, so the cutting force of the blade 23 can still be maintained while reducing the rotation speed of the circular cutterhead 10 . Reducing the rotation speed of the circular cutterhead 10 can also achieve the technical effects of reducing the noise of the lawn mower 100 and saving power.

Moreover, as shown in FIG. 4 , since the elastic element 24 provided in the blade assembly 20 provides elastic force as support for the blade holder 22 , the support force obtained on the blade 23 is increased, thereby increasing the cutting strength of the blade 23 , making the present invention The blade 23 provided by the invention can extend the length L1 of the circular cutterhead 10 , which is significantly longer than the length L1 of the blade 23 of the traditional lawn mower 200 . In the blade assembly 20 provided by the present invention, when the blade 23 is fully extended, the distance between the end of the blade 23 and the outer circumferential surface of the circular cutterhead 10 is L1, that is, the blade 23 can extend out of the circular cutter. The length of the disc 10. The length L1 of the blade 23 that can extend out of the circular cutter head 23 is 5mm-40mm. The length L1 by which the blade 23 can extend out of the circular cutterhead 23 is determined by the selected length of the blade 23 . That is, the blade 23 in the blade assembly 20 provided by the present invention can be the blade 23 equipped with the circular cutterhead 10 in the traditional lawn mower 200. The traditional blade 23 generally has an overall length of 25 mm, and the blade 23 can be extended. The length L1 of the circular cutter head 10 is controlled within 10 mm. The blade 23 in the blade assembly 20 provided by the present invention can either use a traditional blade with a length of 25 mm, so that the length L1 of the outer circumferential surface of the circular cutterhead 10 extended by the blade 23 is between 5 mm and 10 mm, or a traditional blade with a length of 25 mm can be selected. A longer blade 23 than the original one. In this embodiment, the length of the blade 23 provided in the blade assembly 20 is 45 mm, and the length L1 of the blade 23 that can extend out of the circular cutterhead 10 is about 30 mm. The cutterhead assembly 100 in the present invention uses a blade 23 with a larger length, so that the length of the blade 23 protruding from the outer surface of the circular cutterhead 10 can be between 10 mm and 40 mm. Choosing a longer blade 23 can not only increase the cutting range of the cutterhead assembly 100 during cutting, but also greatly improve the cutting ability of the blade 23, so that the cutting that originally required three rotations of the circular cutterhead 10 can now be completed. It only takes one rotation of the circular cutterhead 10 to complete the cutting, thereby improving the cutting efficiency of the entire cutterhead assembly 100 . The selectable length of the blade 23 in the blade assembly 10 provided by the present invention is between 20 mm and 55 mm, that is, the length of the blade 23 can be selected to be 25 mm, 30 mm, 35 mm, 40 mm or 45 mm.

As shown in FIG. 4 , the sealing component 30 in the cutterhead assembly 100 provided by the present invention includes a first seal 31 disposed between the circular cutterhead 10 and the cutter seat 22 and a first seal 31 disposed between the blade 23 and the rotating shaft 21 the second seal 32. When the blade assembly 20 and the circular cutterhead 10 in the cutterhead assembly 100 provided by the present invention are connected, they can rotate relative to each other. Therefore, when the two are installed, at the connection parallel to the direction of rotation, through their own installation The structure is completely closed, thereby avoiding clogging due to installation gaps in the rotation direction. The blade assembly 20 and the circular blade 10 only have two installation gaps in the vertical direction that are perpendicular to each other in the rotation direction. The sealing assembly 30 is configured to seal the installation gap formed by these two places, so as to avoid clogging between the blade assembly 20 and the circular blade 10 and preventing them from rotating. Among them, the first seal 31 is located at the installation gap between the circular cutter head 10 and the knife seat 22, and the second seal 32 is provided at the installation gap between the blade 23 and the rotating shaft 21. The first seal 31 and The installation gaps where the second seal 32 is located are all vertically arranged, and the installation directions of the two installation gaps are mutually perpendicular to the rotation direction of the circular cutterhead 10 .

As shown in Figure 6, it is a schematic three-dimensional structural diagram of the circular cutterhead 10 in the cutterhead assembly 100 provided by the present invention. The bottom surface of the circular cutter head 10 is provided with several mounting positions 11 for fixing the blade assembly 20 . The mounting positions 11 correspond to the blade assembly 20 one by one. In this embodiment, six blade assemblies 20 are provided in the cutterhead assembly 100. Correspondingly, six mounting positions 11 are provided on the bottom surface of the circular cutterhead 10, and each mounting position 11 is used for one blade assembly. 20's installation is fixed. As shown in FIG. 7 , a partial enlarged view of one of the mounting positions 11 on the circular cutterhead 100 is shown. The mounting position 11 includes a circular mounting groove 111 provided on the bottom surface of the circular cutterhead 10 surrounding the cutter seat 22 and a central hole 112 provided in the circular mounting groove 111 for fixing the rotating shaft 21 . The circular mounting groove 111 is provided on the bottom surface of the circular cutter head 10 and extends from the bottom surface toward the top surface. The circular mounting groove 111 is used to nest the knife seat 22 of the blade assembly 20 so that the knife seat 22 One end can be embedded in it and rotate around the center of the circular mounting groove 111 . The central hole 112 inside the circular mounting groove 111 is used to fix the rotating shaft in the blade assembly 20 . In this embodiment, as shown in FIG. 4 , after the vertical connecting portion 211 on the top of the rotating shaft 21 passes through the central hole 112 and is locked with the fixing member 212 on the top of the circular cutterhead 10 , the rotating shaft 21 is connected to the circular cutterhead 10 . Fixed connection of cutter head 10. At the same time, as shown in Figures 4 and 6, the central hole 112 at the mounting position 11 of the circular cutterhead 10 forms an annular mounting column inside the circular mounting groove 111, and the annular mounting column is sleeved on the outside of the rotating shaft 21. Furthermore, in order to maintain a fixed connection with the circular cutterhead 10, the rotating shaft 21 is provided with two threads on the outer circumferential surface of the rotating shaft 21. The threads increase the friction with the circular cutterhead 10, thereby increasing the friction between the rotating shaft 21 and the circular cutterhead 10. Ensure the relative fixation between the rotating shaft 21 and the circular cutterhead 10. At the same time, the central hole 112 on the circular cutterhead 10 and the vertical connecting portion 211 of the rotating shaft 21 abut each other, and the central hole 112 is used to limit the upward movement of the rotating shaft 21 in the vertical direction.

As shown in FIGS. 8 and 9 , there are schematic three-dimensional structural views and cross-sectional views of the blade seat 22 in the blade assembly 20 provided by the present invention. The tool base 22 provided by the present invention includes a base 221, a through hole 222 provided at the center of the base 221 for the rotation shaft 21 to pass through, a first mounting groove 223 provided on the top of the base 221 for fixing the elastic element 24, and a The second mounting groove 224 of the blade 23 is fixed at the bottom of the base 221 . The base 221 of the tool holder 22 is a circular base, and the top of the base 211 is embedded in the circular mounting groove 111 of the circular cutterhead 10, and is between the top of the base 211 and the circular cutterhead 10. An elastic element 24 is provided and fixed through the first mounting groove 223 on the base 211 . The bottom of the base 211 is used to fix the blade 23 so that the blade 23 can rotate synchronously with the knife seat 22.

As shown in FIG. 4 , in this embodiment, the first seal 31 in the sealing assembly 30 is an elastic sealing ring disposed between the base 221 and the circular mounting groove 111 . The base 221 is embedded in the circular mounting groove 111 . An annular groove 2211 for fixing an elastic sealing ring is provided on the outer surface of one end of the groove 111. The inner ring of the elastic sealing ring is embedded in the annular groove 2211 of the base 221, and the outer ring is connected with the annular groove 2211 of the circular cutterhead 10. The circular mounting groove 111 is in contact. And during assembly, lubricating oil will be filled in the gap between the circular mounting groove 111 and the base 221, and the lubricating oil will be filled up to the elastic sealing ring, so that there is a gap between the knife seat 22 and the circular cutterhead 10. A better sealing effect can be achieved at the installation gap between them, that is, the lubricity when the knife seat 22 rotates relative to the circular cutterhead 10 can be improved, and the sealing effect at the gap can also be achieved to prevent the intrusion of dust, impurities, and broken grass. This gap blocks the rotation of the tool holder 22 .

As shown in FIG. 10 , it is a schematic three-dimensional structural diagram of the blade 23 in the blade assembly 20 of the present invention. The blade 23 is provided with a rotation hole 231 for the rotation shaft 21 to pass through. During assembly, the blade 23 is fixed to the bottom of the blade holder 22 , and the rotation hole 231 on the blade 23 is sleeved on the bottom of the rotating shaft 21 , so that the blade 23 can rotate horizontally relative to the rotating shaft 21 along with the blade holder 22 . The second seal 32 in the seal assembly 30 provided by the present invention is disposed at the installation gap between the blade 23 and the rotating shaft 21 . As shown in FIG. 4 , the second seal 32 includes a fastener 321 that penetrates the rotation hole 231 of the blade 23 and is locked to the bottom of the rotating shaft 21 and an annular elastic ring that is disposed between the fastener 321 and the blade 23 . Gasket 322. The fastener 321 passes through the rotation hole 231 of the blade 23 from bottom to top and is fixed to the bottom of the rotating shaft 21 . In this embodiment, the fastener 321 needs to use a screw with a flat receiving surface on the head, thereby ensuring that the receiving surface can directly fit the annular elastic washer 322, and the annular elastic washer 322 is fixedly connected to the rotating shaft 21. The gasket 322 is pressed between the rotating shaft 21 and the head of the fastener 321, so that the gap between the rotating hole 231 of the blade 23 and the rotating shaft 21 is completely closed by the annular elastic gasket 322. The fastener 321 selected in the second seal 32 of the seal assembly 30 in the present invention is preferably a flat-top screw, or a C-head, B-head, P-head, T-head, R-head, H-head or PW-head The bearing surface is a flat screw. The elastic sealing ring of the first sealing member 31 and the annular elastic gasket 322 of the second sealing member 32 in the sealing assembly 30 provided by the present invention can be made of dust-proof sealing elastic materials, such as rubber, silicone and other materials. become.

As shown in FIG. 5 , it is a schematic three-dimensional structural diagram of the elastic element 24 in the blade assembly 20 provided by the present invention. The elastic element 24 provided by the present invention includes an elastic body 241 and a first fixed end 242 and a second fixed end 243 located on both sides of the elastic body 241. The elastic body 241 is sleeved in the first installation groove 223 of the tool holder 22. In this embodiment, the elastic element 24 may be a spring or other elastic component. In this embodiment, the elastic body 241 in the elastic element 24 provides elastic force for the cutter seat 10 when the circular cutterhead 10 rotates at high speed. The first fixed end 242 and the second fixed end on both sides of the elastic body 241 243 is used to connect the tool holder 22 and the circular cutterhead 10 to realize power transmission between the circular cutterhead 10 and the tool holder 22 .

As shown in FIG. 7 , the mounting position 11 of the circular cutter head 10 also includes a first mounting hole 113 disposed in the circular mounting groove 111 for fixing the elastic element 24 . As shown in FIG. The first mounting groove 223 is also provided with a second mounting hole 2231 for fixing the elastic element 24 . The first fixed end 242 is inserted into the first mounting hole 113 of the mounting position 11 , and the second fixed end 243 is inserted into the second mounting hole 2231 of the tool holder 22 . The first mounting hole 113 and the second mounting hole 2231 are both horn holes with gradually increasing diameters, and the horn holes are arranged obliquely along the rotation direction of the circular cutterhead 10. This arrangement can ensure that the elastic element 24 is When the tool holder 24 rotates relative to the rotating shaft 21, it will not affect the rotation of the tool holder 24, ensuring smooth rotation of the tool holder 24. When the cutter holder 22 rotates reversely relative to the circular cutterhead 10 , the first fixed end 242 inserted into the first mounting hole 113 can be tilted to abut against the inner wall of the first mounting hole 113 , and similarly, the second fixed end 242 inserted into the first mounting hole 113 can be tilted to the inner wall of the first mounting hole 113 . The second fixed end 243 in the mounting hole 2231 will also be inclined to abut against the inner wall of the second mounting hole 2231 .

As shown in Figure 9, in the blade assembly 20 provided by the present invention, the tool seat 22 also includes a positioning protrusion 2212 provided on the top of the base 221. As shown in Figure 7, in the circular installation groove 111 of the installation position 11 An arc-shaped sliding groove 114 into which the positioning protrusion 2212 can be inserted is also provided. The positioning protrusion 2212 is disposed on the top of the cutter holder 22. When the top of the cutter holder 22 is embedded in the circular installation groove 111 of the circular cutter head 10, the positioning protrusion 2212 is inserted into the arc-shaped sliding movement of the circular cutter head 10. in the groove 114 and can rotate along the direction in which the arc-shaped sliding groove 114 is arranged. Furthermore, limiting portions 115 that abut against the side surfaces of the positioning protrusions 2212 are provided at both ends of the arc-shaped sliding groove 114 . When the limiting portions 115 at both ends of the arc-shaped sliding groove 114 and the positioning protrusions 2212 of the tool holder 22 abut against each other, the relative rotation angle between the tool holder 22 and the circular cutterhead 10 is limited. In the initial state, the positioning protrusion 2212 of the tool holder 22 abuts the limiting portion 115 on one side of the arc-shaped sliding groove 114. At this time, the tool holder 22 drives the cutting portion of the blade 23 fixed below it to be completely Extending from the bottom of the circular cutterhead 10, as shown in Figure 2. When the tool holder 22 drives the blade 23 to rotate relative to the rotating shaft 21 , the positioning protrusion 2212 of the tool holder 22 slides along the arc-shaped sliding groove 114 and abuts against the limiting portion 115 at the other end of the arc-shaped sliding groove 114 . At this time, the cutting part of the blade 23 fixed below the cutter seat 22 can be completely rotated to the bottom of the circular cutter head 10, as shown in Figure 3. The positioning protrusion 2212 on the tool holder 22 and the arc-shaped sliding groove 114 on the mounting position 11 function to limit the angular range of the horizontal rotation of the tool holder 22 relative to the circular cutterhead 10 .

As shown in Figures 1 and 4, the blade assembly 20 provided by the present invention also includes a sleeve 25 disposed in the cutter seat 22 and sleeved on the rotating shaft 21. The sleeve 25 is fixed in the cutter seat 22 and sleeved Located on the rotating shaft 21. As shown in Figure 9, it is a full cross-sectional view of the tool holder 22 provided by the present invention. The through hole 222 in the base 221 of the tool holder 22 includes a first step hole 2221 connected to the top surface of the base 221 and a second step hole 2222 connected to the bottom surface of the base 221. The sleeve 25 is disposed on the first step hole 2221. Inside the step hole 2221. The shaft sleeve 25 is disposed inside a side of the base 221 near the top. The shaft sleeve 25 allows the tool holder 22 to rotate relative to the rotating shaft 21 more smoothly.

As shown in Figure 8, the second mounting groove 224 provided at the bottom of the tool holder 21 provided by the present invention is a U-shaped groove provided on the bottom surface of the base 221. The U-shaped groove has two opposite parallel sides 2241 and a connecting Two arc-shaped sides 2242 of parallel sides 2241. The parallel sides 2241 and the arcuate sides 2242 form a structural fence surrounding the end of the blade 23 , and the structural fence can completely block the horizontal plane connecting the end of the blade 23 to the knife seat 22 . When the blade 23 is fixed to the bottom of the knife seat 22, one end of the blade 23 is embedded in the U-shaped groove, and the other end protrudes from the opening of the U-shaped groove. The structural fence formed by the U-shaped groove can block the horizontal gap between the blade 23 and the tool seat 22 as much as possible, and only flows out an opening equal to the width of the blade 23, through which the cutting end of the blade 23 is removed from the tool seat 22 protrude from the U-shaped groove.

As shown in FIG. 4 , in the blade assembly 20 provided by the present invention, the blade 23 is fixed in the second mounting groove 224 provided at the bottom of the blade holder 22 . The tool base 22 further includes at least one fixing hole 225 provided at the bottom of the base 221 for fixing the blade 23 and at least one positioning post 226 provided at the bottom of the base 221 . In this embodiment, as shown in FIG. 8 , the bottom of the tool holder 22 is provided with two fixing holes 225 . The two fixing holes 225 are spaced apart along the length direction of the blade 23 . The bottom of the tool holder 22 is provided with two fixing holes 225 . Positioning posts 226, two positioning posts 226 are spaced apart along the width direction of the blade 23. The blade 23 is provided with a connecting hole 232 into which the locking member 26 can be inserted and a positioning hole 233 into which the positioning post 226 can be inserted. During installation, the end of the blade 23 is inserted into the second installation groove 224 at the bottom of the blade holder 22, and the two positioning holes 223 of the blade 23 are inserted into the positioning posts 226 at the bottom of the blade holder 22, and then the locking member 26 is The connecting hole 232 passing through the blade 23 is locked to the fixing hole 225 of the blade holder 22 . The locking member 26 may be a screw, a rivet, a bolt, or other type of connection element, and the blade 23 and the tool base 22 are fixedly connected through the locking member 26 .

The cutterhead assembly 100 provided by the present invention includes a circular cutterhead 10 and a blade assembly 20, in which the cutter seat 22 and the blade 23 in the blade assembly 20 are fixedly connected as a whole, and the circular cutterhead 10 and the cutter seat 22 are connected by The elastic element 24 is connected through transmission, so that when the circular cutterhead 10 rotates, it drives the knife holder 22 and the blade 23 to rotate synchronously; when the blade 23 encounters an obstacle, the blade 23 and the knife holder 22 can also rotate in reverse around the rotating shaft 21 to avoid it. Obstacles; at the same time, a sealing assembly 30 is provided between the circular cutterhead 10 and the blade assembly 20. The sealing assembly 30 reduces the risk of the circular cutterhead 10 and the blade assembly 20 being blocked by debris and unable to rotate, thereby extending the The service life of the entire cutterhead assembly 100 can also reduce the frequency of maintenance and replacement of the blades 23 during use of the cutterhead assembly 100 .

As shown in Figure 11, it is a lawn mower 200 provided by the present invention. The present invention also provides a lawn mower 200, including the above-mentioned cutterhead assembly 100 and an engine driving the cutterhead assembly 100. The center of the circular cutterhead 10 in the cutterhead assembly 100 is provided with a mounting hole fixed to the driving rod 210 of the engine, so that the circular cutterhead 10 can rotate at high speed with the engine. The lawn mower 200 provided by the present invention adopts the above-mentioned cutterhead assembly 100, which can reduce the risk of being blocked by debris between the blade assembly 20 and the circular cutterhead 10, thereby extending the life of the entire cutterhead assembly 100. The service life can also reduce the frequency of regular maintenance of the lawn mower 200 during use.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims

A cutterhead assembly, characterized in that it includes a circular cutterhead, a plurality of blade assemblies evenly distributed on the circular cutterhead along the circumference, and a blade assembly disposed between the circular cutterhead and the blade assembly. sealing components;

The blade assembly includes a rotating shaft fixed on the bottom of the circular cutterhead, a cutter holder sleeved on the rotating shaft, a blade fixed on the bottom of the cutter holder, and the circular cutterhead and the cutter holder. Elastic elements of transmission connections;

The sealing assembly includes a first sealing member disposed between the circular cutterhead and the cutter seat and a second sealing member disposed between the blade and the rotating shaft.
A cutterhead assembly according to claim 1, characterized in that the bottom surface of the circular cutterhead is provided with several installation positions for fixing the blade assembly, and the installation positions are connected with the blade assembly. Arranged in one-to-one correspondence, the installation position includes a circular installation groove provided on the bottom surface of the circular cutterhead surrounding the cutter seat and a central hole provided in the circular installation groove to fix the rotating shaft.
A cutter head assembly according to claim 2, wherein the cutter holder includes a base, a through hole provided at the center of the base for the rotating shaft to pass through, and a through hole provided on the base. The top of the base is provided with a first installation groove for fixing the elastic element and a second installation groove is provided at the bottom of the base for fixing the blade.
A cutter head assembly according to claim 3, characterized in that the first sealing member is an elastic sealing ring disposed between the base and the circular installation groove, and the base is embedded in the An annular groove for fixing the elastic sealing ring is provided on the outer surface of one end of the circular mounting groove.
The cutterhead assembly of claim 3, wherein the blade is provided with a rotation hole for the rotating shaft to pass through, and the second sealing member includes a rotation hole that is passed through the blade. The fastener is located and locked at the bottom of the rotating shaft and the annular elastic gasket is provided between the fastener and the blade.
A cutterhead assembly according to claim 3, characterized in that the elastic element includes an elastic body and a first fixed end and a second fixed end located on both sides of the elastic body, and the elastic body is sleeved on In the first mounting groove of the tool holder.
The cutterhead assembly according to claim 6, wherein the mounting position of the circular cutterhead further includes a first mounting hole disposed in the circular mounting groove for fixing the elastic element, and the The first mounting groove of the knife holder is also provided with a second mounting hole for fixing the elastic element, the first fixed end is inserted into the first mounting hole of the mounting position, and the second fixed end is inserted into the knife into the second mounting hole of the base.
A cutter head assembly according to claim 3, characterized in that the cutter holder further includes a positioning protrusion provided on the top of the base, and a circular installation groove of the installation position is further provided with a positioning protrusion for The arc-shaped sliding groove in which the positioning protrusion is embedded is provided with limiting portions at both ends of the arc-shaped sliding groove that abut against the side surfaces of the positioning protrusion.
A cutter head assembly according to claim 3, characterized in that the blade assembly further includes a sleeve arranged in the cutter seat and sleeved on the rotating shaft, and a through hole in the base It includes a first step hole communicated with the top surface of the base and a second step hole communicated with the bottom surface of the base, and the shaft sleeve is arranged in the first step hole.
The cutterhead assembly of claim 3, wherein the second mounting groove is a U-shaped groove provided on the bottom surface of the base, and one end of the blade is embedded in the U-shaped groove. , the other end extends from the opening of the U-shaped groove.
A cutterhead assembly according to claim 1, wherein the blade can extend out of the circular cutterhead by a length of 5mm-40mm.
A lawn mower, characterized in that it includes the cutterhead assembly according to any one of claims 1 to 11 and an engine driving the cutterhead assembly.