Knife and mower
By designing lawnmower blades with movable blades and reset mechanisms, the problems of blades getting tangled in grass and safety hazards have been solved, achieving efficient grass cutting and safe use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN MUHAI TECHNOLOGY CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-06-30
Smart Images
Figure CN224419402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of weeding equipment technology, and in particular to a blade and a lawnmower. Background Technology
[0002] In landscaping and agricultural production, lawnmowers are widely used due to their efficient and convenient weeding capabilities. However, existing designs still have shortcomings. For example, current blades are rotatably mounted on the blade disc. When the disc rotates, the blades are thrown outwards to cut the grass. During mowing, grass clippings easily become entangled in the gap between the blades and the disc, causing the blades to jam and preventing them from rotating out or retracting smoothly, thus affecting the mowing effect and efficiency. In addition, when not in use, the lawnmower blades are also exposed outside the disc, making them susceptible to damage from impacts and posing a safety hazard of cutting the user. Utility Model Content
[0003] The main purpose of this utility model is to provide a knife and a lawnmower to solve the above-mentioned technical problems.
[0004] To achieve the above objectives, this utility model proposes a cutting tool for use in a lawnmower, the cutting tool comprising:
[0005] The blade disc is rotatably connected to the lawnmower.
[0006] The connecting seat is rotatably connected to the cutter head;
[0007] The blade is movably connected to the connecting seat and can move radially along the blade disc. During grass cutting, the blade disc can be driven to rotate, and at least part of the blade can extend out of the outer periphery of the blade disc.
[0008] A reset element is disposed between the blade and the connecting seat, and the reset element is used to drive the blade to retract into the blade when the cutter head stops rotating.
[0009] In one embodiment, the connecting seat has an internal mounting cavity and a first opening communicating with the mounting cavity on its side. The first opening is disposed facing the outer periphery of the cutter head, and the blade is slidably disposed in the mounting cavity and enters and exits the mounting cavity through the first opening.
[0010] In one embodiment, the cutter head has a receiving cavity inside and a second opening communicating with the receiving cavity on its outer periphery. The connecting seat is rotatably disposed in the receiving cavity, and the rotation axis of the connecting seat is parallel to the rotation axis of the cutter head. The second opening is disposed opposite to the first opening.
[0011] In one embodiment, a limiting part is further provided within the accommodating cavity. The limiting part is disposed on the rotation path of the connecting seat to limit the rotation angle of the connecting seat.
[0012] In one embodiment, two limiting parts are provided, and in the circumferential direction of the cutter head, the two limiting parts are respectively disposed on opposite sides of the connecting seat.
[0013] In one embodiment, the connecting seat rotates at an angle of 30 to 50 degrees.
[0014] In one embodiment, a rotating shaft protrudes from the inner wall of the accommodating cavity, the rotating shaft being disposed on at least one side of the connecting seat, the connecting seat having a connecting hole, and the rotating shaft rotatably engaging with the connecting hole; and / or,
[0015] A shielding portion is provided on the side of the connecting seat facing the second opening. The shielding portion extends around the rotation axis of the connecting seat and is used to shield the second opening when the connecting seat rotates.
[0016] In one embodiment, a sliding groove is provided in the connecting seat, the sliding groove extends toward the first opening, the cutting tool further includes a sliding member, the sliding member is slidably disposed in the sliding groove, the resetting member connects the connecting seat and the sliding member, and the cutting blade is disposed on the sliding member.
[0017] In one embodiment, the connecting seat is further provided with a limiting groove, which is located on one side of the slide groove and extends parallel to the slide groove. The length of the limiting groove is not greater than the length of the slide groove. The sliding member is provided with a sliding part, which is slidably disposed in the limiting groove.
[0018] In one embodiment, the cross-section of the blade is the same as and sized as the first opening; and / or,
[0019] The connecting seat includes an upper shell and a lower shell that interlock, the upper shell and the lower shell being detachably connected and forming the mounting cavity; and / or,
[0020] The blade disc includes an upper disc and a lower disc that interlock. The upper disc and the lower disc are detachably connected and enclose a receiving cavity with a second opening. The connecting seat is rotatably disposed in the receiving cavity. During grass cutting operations, the blade extends out of the receiving cavity from the second opening.
[0021] This utility model also proposes a lawnmower, including the blades described above.
[0022] In the technical solution of this utility model, the cutter includes a cutter disc, which is rotatably connected to a lawnmower to drive the blade to rotate. A connecting seat is rotatably connected to the cutter disc, and the blade is set on the connecting seat and movably connected to the connecting seat. The blade can move relative to the cutter disc in the radial direction. In addition, a reset member is connected between the blade and the connecting seat. When the cutter disc is stationary, the blade retracts into the cutter disc under the drive of the reset member. During lawn mowing, the blade head is driven to rotate. As the blade head rotates, the blades and connecting seats rotate with it. The faster the rotation speed, the greater the centrifugal force on the blades. Under the action of centrifugal force, the blades overcome the limit of the reset element and can extend at least partially to the outer periphery of the blade head, allowing for lawn mowing. Because the blades swing with the connecting seats, they can swing away from hard objects, preventing damage to the blades. In addition, when the blade head stops rotating, the blades can retract radially into the blade head under the drive of the reset element. When the blades retract, the grass can fall off the blades, thus preventing grass from getting tangled between the blades and the blade head, preventing grass from getting stuck. Furthermore, the blades can also prevent operators from being cut when handling the blade head, improving safety. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0024] Figure 1 A schematic diagram of the structure of the cutting tool provided by this utility model;
[0025] Figure 2 An exploded view of the cutting tool provided by this utility model;
[0026] Figure 3 Another structural schematic diagram of the cutting tool provided by this utility model;
[0027] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;
[0028] Figure 5 A cross-sectional schematic diagram of the cutter head in the tool provided by this utility model;
[0029] Figure 6 An exploded view of the connecting seat in the cutting tool provided by this utility model.
[0030] Explanation of icon numbers:
[0031] 100, cutter head; 110, receiving cavity; 120, second opening; 130, limiting part; 140, rotating shaft; 150, upper plate; 160, lower plate; 200, connecting seat; 210, mounting cavity; 220, first opening; 230, connecting hole; 240, shielding part; 250, sliding groove; 260, limiting groove; 270, upper shell; 280, lower shell; 300, cutting tool; 400, resetting part; 500, sliding part; 510, sliding part.
[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0036] To reduce the risk of grass getting caught and to improve the reliability and safety of lawnmowers during use, this technical solution proposes a cutting tool for use in lawnmowers, which includes:
[0037] The blade 100 is used for rotational connection with the lawnmower;
[0038] The connecting seat 200 is rotatably connected to the cutter head 100;
[0039] The blade 300 is movably connected to the connecting seat 200 and can move radially along the blade disc 100. During the mowing operation, the blade disc 100 can be driven to rotate, and at least a portion of the blade 300 can extend out of the outer periphery of the blade disc 100.
[0040] The reset member 400 is located between the blade 300 and the connecting seat 200. The reset member 400 is used to drive the blade 300 to retract into the blade 100 when the cutter head 100 stops rotating.
[0041] Specifically, such as Figures 1 to 3The cutter has a disc 100, which is disc-shaped. The center of the top of the disc 100 is connected to a lawnmower and rotates around its own axis under the drive of the lawnmower. A connecting seat 200 is provided on the disc 100. The connecting seat 200 can be located inside the disc 100, or on the top or bottom of the disc 100. The connecting seat 200 is rotatably connected to the disc 100 via a rotating shaft 140 or other structures. In this design, the rotation axis of the connecting seat 200 is offset from the center of the disc 100 and is parallel to the rotation axis of the disc 100, allowing the connecting seat 200 to swing within the plane of rotation of the disc 100. A blade 300 is also provided on the connecting seat 200. The blade 300 is used to cut weeds. The blade 300 is slidably connected to the connecting seat 200, and its movement direction is radial to the cutter head 100. Additionally, a reset member 400 is provided between the blade 300 and the connecting seat 200. The reset member 400 applies a force to the blade 300 toward the center of the cutter head 100. The structure of the reset member can be flexibly designed according to requirements. For example, the reset member 400 can be a spring or similar structure, connecting the blade 300 and the connecting seat 200 and applying an elastic force to the blade toward the center of the cutter head 100. Alternatively, the reset member 400 can be a magnet or similar structure, located on the blade 300 near the center of the cutter head 100, and applying a magnetic force to the blade 300 toward the center of the cutter head 100. When the cutter head 100 is stationary, the blade 300 retracts into the cutter head 100 under the action of the reset member 400. At this time, the user will not touch the blade 300, preventing cuts. When the cutter head 100 rotates, the blade 300 and the connecting seat 200 rotate with the cutter head 100. The faster the rotation speed, the greater the centrifugal force of the blade 300. Under the action of centrifugal force, the blade 300 gradually extends to the outer periphery of the cutter head 100 against the force of the reset member 400 to perform grass cutting. Since the blade 300 swings with the connecting seat 200, it can swing to avoid hitting hard objects, preventing damage to the blade 300. When the cutter head 100 stops rotating, the force of the reset member 400 causes the blade 300 to retract into the cutter head 100 radially. During this process, grass will fall off the blade 300. During the retraction of the blade 300, grass is prevented from getting tangled between the blade 300 and the cutter head 100, avoiding grass trapping. In addition, the retraction of the blade 300 into the cutter head 100 prevents operators from being cut when handling the cutter head 100, thus improving safety.
[0042] To further optimize the structure and function of the aforementioned cutting tools, such as Figure 4 and Figure 6In one embodiment of the present invention, the connecting seat 200 has an internal mounting cavity 210 and a side portion with a first opening 220 communicating with the mounting cavity 210. The first opening 220 is disposed facing the outer periphery of the cutter head 100. The blade 300 is slidably disposed in the mounting cavity 210 and enters and exits the mounting cavity 210 through the first opening 220. The connecting seat 200 is hollow, and a mounting cavity 210 is formed inside the connecting seat 200. A first opening 220 is provided on the side of the connecting seat 200 away from the center of the cutter head 100. The first opening 220 communicates with the mounting cavity 210. The blade 300 is slidably disposed in the mounting cavity 210. Specifically, the blade 300 can slide through a mechanism that cooperates with a slider and a slide rail. By sliding, the blade 300 can extend out from the first opening 220 or retract into the mounting cavity 210. The reset member 400 is also disposed in the mounting cavity 210. The reset member 400 can be configured as a tension spring. The tension spring can be disposed on the side of the blade 300 away from the first opening 220 and extends along the sliding direction of the blade 300. One end of the tension spring can be fixed to the inner wall of the mounting cavity 210, and the other end can be fixed to the blade 300. When the blade 300 slides, the reset member 400 applies a force to the blade 300 along the sliding direction and extends parallel to the slide groove 250. When the cutter head 100 rotates, the blade 300 slides along the mounting cavity 210 towards the first opening 220 under centrifugal force, extending out from the outer periphery of the cutter head 100 to perform grass cutting. When the cutter head 100 stops rotating, the force of the reset member 400 drives the blade 300 to slide inward towards the mounting cavity 210, completely retracting it into the mounting cavity 210. In practical applications, this design not only prevents grass clippings from getting tangled between the blade 300 and the cutter head 100, but also allows the grass clippings to fall off when the blade 300 retracts, reducing the risk of grass getting caught. In addition, the connecting seat 200 also provides protection for the blade 300 and the reset member 400, which helps extend the service life of the blade 300.
[0043] like Figure 2As shown, in one embodiment of the present invention, the cutter head 100 has a receiving cavity 110 inside and a second opening 120 communicating with the receiving cavity 110 on its outer periphery. The connecting seat 200 is rotatably disposed in the receiving cavity 110, and the rotation axis of the connecting seat 200 is parallel to the rotation axis of the cutter head 100. The second opening 120 is disposed opposite to the first opening 220. In this design, the blade 300 has a hollow interior forming the aforementioned receiving cavity 110. This receiving cavity 110 provides installation space for the connecting seat 200. The shape and size of the receiving cavity 110 are adapted to the connecting seat 200 to ensure that the connecting seat 200 remains stable during rotation, reducing shaking and vibration. The outer periphery of the cutter head 100 is provided with a second opening 120 that communicates with the receiving cavity 110. The connecting seat 200 is rotatably disposed within the receiving cavity 110, and its rotation axis is parallel to the rotation axis of the cutter head 100. In addition, the relative arrangement of the second opening 120 and the first opening 220 provides a channel for the extension and retraction of the blade 300. In addition, placing the connecting seat 200 inside the cutter head 100 can protect the connecting seat 200 and prevent grass clippings from getting stuck between the connecting seat 200 and the cutter head 100, which would affect the swing of the connecting seat 200 and improve reliability. Furthermore, the connection seat 200 and the cutter head 100 overlap in space, which helps to make full use of the internal space of the cutter head 100, reduce the thickness and weight of the entire cutter, and make the cutter easier to drive.
[0044] like Figure 4 In one embodiment of this utility model, a limiting part 130 is also provided within the accommodating cavity 110. The limiting part 130 is disposed on the rotation path of the connecting seat 200 to limit the rotation angle of the connecting seat 200. This solution further optimizes the cooperation structure between the cutter head 100 and the connecting seat 200, ensuring that the connecting seat 200 is more controllable during swinging. Specifically, a limiting part 130 is also provided on the inner wall of the accommodating cavity 110. The limiting part 130 can be a rib structure. The limiting part 130 is disposed on the swinging path of the connecting seat 200. In this way, while ensuring that the connecting seat 200 swings to avoid hard objects, it also ensures that the connecting seat 200 can only swing within a limited angle range, avoiding the instability of the cutter head 100's movement state or structure that may be caused by excessive rotation of the connecting seat 200. It also ensures that the blade 300 can maintain a stable cutting posture, taking into account both cutting efficiency and quality. In addition, as Figure 4In another embodiment of this utility model, two limiting parts 130 are provided. On the circumferential direction of the cutter head 100, the two limiting parts 130 are respectively disposed on opposite sides of the connecting seat 200. The two limiting parts 130 are symmetrically arranged about the connecting seat 200. This design ensures that the connecting seat 200 can be limited in rotation angle regardless of the direction of rotation of the cutter head 100. Furthermore, the inventors of this solution accidentally discovered, and through simulation and verification, that the two limiting parts 130 limit the swing angle of the connecting seat 200 to 30-50 degrees, which can meet the requirements of effectively protecting the blade 300 while maintaining high-efficiency mowing performance in most working conditions. Preferably, the two limiting parts 130 limit the swing angle of the connecting seat 200 to 40 degrees, at which swing angle both effective protection of the blade 300 and high efficiency in mowing operations are achieved.
[0045] like Figure 5 and Figure 6 This paper illustrates one implementation of a rotatable connection between a connecting seat 200 and a cutter head 100. In this scheme, a rotating shaft 140 protrudes from the inner wall of the accommodating cavity 110. The rotating shaft 140 is located on at least one side of the connecting seat 200. A connecting hole 230 is provided on the connecting seat 200, and the rotating shaft 140 is rotatably engaged with the connecting hole 230. The rotating shaft 140 is cylindrical and is located on opposite sides of the connecting seat 200 along the axial direction of the cutter head 100. Correspondingly, the connecting seat 200 has a recessed connecting hole 230. The rotating shaft 140 passes into the connecting hole 230 and forms a rotatable engagement, allowing the connecting seat 200 to rotate around the rotating shaft 140. This design not only ensures reliable rotation of the connecting seat 200 but also simplifies the structure for achieving the rotatable connection. It helps reduce the machining difficulty of the cutting tool and saves machining costs. Furthermore, the assembly of the connecting seat 200 and the cutter head 100 is more convenient and also helps reduce assembly difficulty. In another embodiment, a support portion is provided around the periphery of the connecting hole 230, and the support portion slides with the periphery of the rotating shaft 140 to make the outer peripheral wall of the connecting seat 200 spaced from the inner wall of the receiving cavity 110. In this solution, the support portion is annular. The setting of the support portion makes the outer peripheral wall of the connecting seat 200 suspended relative to the receiving cavity 110, which can reduce friction, make the connecting seat 200 and the blade 300 swing more smoothly, and reduce the impact of hard objects on the blade 300.
[0046] like Figure 6In one embodiment of this utility model, a blocking portion 240 is provided on the side of the connecting seat 200 facing the second opening 120. The blocking portion 240 extends around the rotation axis of the connecting seat 200 and is used to block the second opening 120 when the connecting seat 200 rotates. Specifically, the blocking portion 240 extends around the rotation axis of the connecting seat 200 to form an arc-shaped structure. When the connecting seat 200 rotates within the receiving cavity 110, the blocking portion 240 can block the area within the second opening 120 excluding the first opening 220, preventing grass clippings from entering the receiving cavity 110 through the gap between the connecting seat 200 and the second opening 120. This improves the protective performance and reliability of the blade, reduces the wear and failure risk of internal mechanical parts, and extends the service life of the blade.
[0047] like Figure 6 As shown, in one embodiment of this utility model, a groove 250 is provided in the connecting seat 200, extending towards the first opening 220. The cutting tool also includes a sliding member 500, which is slidably disposed within the groove 250. A reset member 400 connects the connecting seat 200 and the sliding member 500, and the blade 300 is disposed on the sliding member 500. The groove 250 extends radially along the cutting disc 100, forming a path to guide the movement of the blade 300. The shape and size of the sliding member 500 are adapted to the groove 250, ensuring that the sliding member 500 does not wobble or deviate when sliding within the groove 250, and ensuring that the blade 300 maintains smooth linear motion during extension and retraction. The reset member 400 is connected between the connecting seat 200 and the sliding member 500, indirectly acting on the blade 300 through the sliding member 500, allowing the blade 300 to extend and retract smoothly. This solution improves the motion stability of the blade 300 by cooperating with the sliding member 500 and the groove 250, reduces the vibration or jamming that may occur during the extension and retraction of the blade 300, and ensures the reliability of the tool.
[0048] like Figure 6 As shown, in one embodiment of this utility model, the connecting seat 200 is further provided with a limiting groove 260. The limiting groove 260 is located on one side of the sliding groove 250 and extends parallel to the sliding groove 250. The length of the limiting groove 260 is not greater than the length of the sliding groove 250. The sliding member 500 is provided with a sliding part 510, which is slidably disposed in the limiting groove 260. In this solution, the length of the limiting groove 260 is shorter than that of the sliding groove 250, which aims to limit the range of motion of the sliding member 500, ensure that the sliding member 500 has sufficient contact with the sliding groove 250, prevent excessive sliding that could cause jamming or unstable movement of the blade 300, and ensure that the extension length of the blade 300 is moderate, so as to effectively cut grass while avoiding damage caused by excessive extension.
[0049] In another embodiment of this utility model, the cross-section of the blade 300 is the same shape and size as the first opening 220. In this solution, the shape of the first opening 220 is the same as the cross-section of the blade 300, and the inner wall of the first opening 220 can contact or gap fit with the outer surface of the blade 300. This design ensures that the blade 300 can retract smoothly into the mounting cavity 210, while the periphery of the first opening 220 can more effectively block grass clippings attached to the blade 300, reducing the possibility of grass clippings entering the mounting cavity 210, reducing the wear and failure risk of internal mechanical parts, and also reducing the risk of grass getting stuck. Figure 6 In another embodiment of this utility model, the connecting seat 200 includes an upper shell 270 and a lower shell 280 that are fastened together. The upper shell 270 and the lower shell 280 are detachably connected and together form an installation cavity 210. In this solution, the lower shell 280 is recessed to form a cavity with a top opening. The upper shell 270 is fastened to the opening of the cavity and forms the aforementioned installation cavity 210. In addition, the upper shell 270 and the lower shell 280 can be fastened with screws, which simplifies the assembly process and also makes it convenient for users to disassemble the tool later, thus improving the ease of use.
[0050] like Figure 2 and Figure 5 In another embodiment of this utility model, the cutter disc 100 comprises an upper disc 150 and a lower disc 160. The upper disc 150 can be connected to the output shaft of a lawnmower to drive the entire blade to rotate. The upper disc 150 and the lower disc 160 can be fastened together by screws or the like. In addition, the side of the upper disc 150 facing the lower disc 160 and the side of the lower disc 160 facing the upper disc 150 are both provided with grooves with openings. After the upper disc 150 and the lower disc 160 are fastened together, the two grooves together form the aforementioned receiving cavity 110. Furthermore, a second opening 120 is provided on the radial side of the cutter disc 100 to communicate with the receiving cavity 110. The connecting seat 200 is rotatably disposed in the receiving cavity 110 and the blade can extend out of the receiving cavity 110 from the second opening 120. In this design, the cutter head 100 adopts an assembly method of upper plate 150 and lower plate 160, which simplifies the structure of the cutter head 100, reduces the machining difficulty of the cutter head 100, and facilitates the installation of internal components such as connecting seat 200, thereby improving the convenience of use and disassembly.
[0051] like Figure 2 In another embodiment of this utility model, multiple connecting seats 200 are provided, and the multiple connecting seats 200 are spaced apart along the circumference of the cutter head 100. Each connecting seat 200 is provided with at least one blade 300. In this solution, three or more connecting seats 200 can be provided, and the multiple connecting seats 200 are arranged at equal intervals around the center of the cutter head 100. Each connecting seat 200 is provided with one of the aforementioned blades 300. This can ensure the dynamic balance of the blade during rotation and improve the efficiency of mowing.
[0052] This utility model also proposes a lawnmower equipped with blades. The specific structure of the blades is as described in the above embodiments. Since this lawnmower adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0053] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A cutting tool for use in a lawnmower, characterized in that, The cutting tool includes: The blade disc is rotatably connected to the lawnmower. The connecting seat is rotatably connected to the cutter head; The blade is movably connected to the connecting seat and can move radially along the blade disc. During grass cutting, the blade disc can be driven to rotate, and at least part of the blade can extend out of the outer periphery of the blade disc. A reset element is disposed between the blade and the connecting seat, and the reset element is used to drive the blade to retract into the blade when the cutter head stops rotating.
2. The cutting tool as described in claim 1, characterized in that, The connector has an internal mounting cavity and a first opening communicating with the mounting cavity on its side. The first opening faces the outer periphery of the cutter head. The blade is slidably disposed in the mounting cavity and enters and exits the mounting cavity through the first opening.
3. The cutting tool as described in claim 2, characterized in that, The cutter head has an internal accommodating cavity and a second opening communicating with the accommodating cavity on its outer periphery. The connecting seat is rotatably disposed within the accommodating cavity, and the rotation axis of the connecting seat is parallel to the rotation axis of the cutter head. The second opening is disposed opposite to the first opening.
4. The cutting tool as described in claim 3, characterized in that, The cavity is further provided with a limiting part, which is located on the rotation path of the connecting seat to limit the rotation angle of the connecting seat.
5. The cutting tool as described in claim 4, characterized in that, Two limiting parts are provided, and the two limiting parts are respectively arranged on opposite sides of the connecting seat in the circumferential direction of the cutter head; and / or, the connecting seat rotates at an angle of 30 degrees to 50 degrees.
6. The cutting tool as described in claim 3, characterized in that, A rotating shaft protrudes from the inner wall of the accommodating cavity, the rotating shaft being located on at least one side of the connecting seat, the connecting seat having a connecting hole, and the rotating shaft rotatably engaging with the connecting hole; and / or, A shielding portion is provided on the side of the connecting seat facing the second opening. The shielding portion extends around the rotation axis of the connecting seat and is used to shield the second opening when the connecting seat rotates.
7. The cutting tool as described in claim 2, characterized in that, The connecting seat is provided with a sliding groove that extends toward the first opening. The cutting tool also includes a sliding member that is slidably disposed in the sliding groove. The resetting member connects the connecting seat and the sliding member. The cutting blade is disposed on the sliding member.
8. The cutting tool as described in claim 7, characterized in that, The connecting seat is also provided with a limiting groove, which is located on one side of the slide groove and extends parallel to the slide groove. The length of the limiting groove is not greater than the length of the slide groove. The sliding member is provided with a sliding part, which is slidably disposed in the limiting groove.
9. The cutting tool as described in claim 2, characterized in that, The cross-section of the blade is the same shape and size as the first opening; and / or, The connecting seat includes an upper shell and a lower shell that interlock, the upper shell and the lower shell being detachably connected and forming the mounting cavity; and / or, The blade disc includes an upper disc and a lower disc that interlock. The upper disc and the lower disc are detachably connected and enclose a receiving cavity with a second opening. The connecting seat is rotatably disposed in the receiving cavity. During grass cutting operations, the blade extends out of the receiving cavity from the second opening.
10. A lawnmower, characterized in that, The cutting tool includes any one of claims 1 to 9.