Tool-free quick-change blade structure and mower

Abstract

The utility model discloses a tool-free quick-change blade structure, which belongs to the technical field of sanders, solves the problem of inconvenience in blade replacement in the prior art, and adopts the technical scheme that the tool-free quick-change blade structure mainly comprises a cutter head and a blade, the blade is provided with a movable hole and a locking hole, and the diameter of the locking hole is smaller than that of the movable hole. The movable hole is communicated with the locking hole through a connecting section, the connecting section is provided with a limiting piece, a connecting piece is preassembled on the cutter head and can penetrate through the movable hole, and when the blade moves relative to the cutter head, the connecting piece forces the limiting piece to move so that the connecting piece can enter and exit from the locking hole. And the limiting piece resets to limit and lock the connecting piece in the locking hole. The tool-free quick-change blade is mainly used for realizing tool-free quick-change of the blade, and is more convenient to change. The utility model further aims at disclosing the mower, so that the blade is more convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of lawn mowers, in particular to a tool-free quick-change blade structure and a lawn mower. Background Art

[0002] In the prior art, such as the utility model patents CN203912562U and CN215073957U, it is disclosed that the blade is fixed on the cutter disc by screws. Lawn mowers are often used outdoors and exposed to natural environments such as humidity, grass clippings, and soil. The metal surface of the screws is easily affected by moisture and humidity, resulting in oxidation and rust. In addition, grass clippings and soil will adhere to the screws, making it difficult to disassemble the screws. Blade replacement is inconvenient. Rust will increase the friction between the screws and the blade or the fixing seat, making it difficult to disassemble. Moreover, a certain torque is required to ensure the firmness when tightening the screws, and human fingers usually cannot provide enough force and torque to loosen or tighten the screws. Usually, a screwdriver, wrench, or power tool is needed to provide the required torque, and the screw may need to be rotated multiple times until it is tightened or loosened. The user needs to carry a tool kit at all times, resulting in inconvenient blade replacement. Content of the Utility Model

[0003] The purpose to be achieved by the utility model is to provide a tool-free quick-change blade structure, which solves the problem of inconvenient blade replacement in the prior art, realizes tool-free quick blade replacement, and is more convenient for replacement.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a tool-free quick-change blade structure, including a cutter disc and a blade. The blade is provided with a movable hole and a locking hole with a diameter smaller than that of the movable hole. The movable hole and the locking hole are communicated through a connecting section. The connecting section is provided with a limiting member. A connecting member is pre-installed on the cutter disc. The connecting member can pass through the movable hole. When the blade moves relative to the cutter disc, the connecting member forces the limiting member to shift so that the connecting member can enter and exit the locking hole, and the limiting member resets to limit and lock the connecting member in the locking hole.

[0005] After adopting the above technical scheme, the utility model has the following advantages: The user can first sleeved the blade on the connecting member through the movable hole, and then move the blade to force the connecting member to force the limiting member to shift so that the connecting member enters the locking hole. The limiting member resets to limit and lock the connecting member in the locking hole to realize the installation of the blade. On the contrary, move the blade to force the connecting member to force the limiting member to shift so that the connecting member disengages from the locking hole, and the connecting member disengages from the blade through the movable hole to realize the disassembly of the blade. The replacement steps are simplified, the operation difficulty is reduced, the user can replace the blade by hand, the replacement is more convenient, there is no need to search for and use tools such as screwdrivers and wrenches, the work efficiency is improved, and the time for replacing the blade is greatly shortened.

[0006] Further, the connecting member includes a first section and a second section along its length direction, the transverse dimension of the second section is larger than that of the first section, the transverse dimensions of the first section are both smaller than the diameter of the movable hole and the diameter of the locking hole, the transverse dimension of the second section is smaller than the diameter of the movable hole and larger than the diameter of the locking hole, both the first section and the second section can pass through the movable hole, and the first section enters the locking hole from the movable hole and can rotate freely in the locking hole.

[0007] Adopting the foregoing technical solution, since the size of the first section is smaller than that of the movable hole and the locking hole, and the transverse dimension of the second section is smaller than the diameter of the movable hole, both the first section and the second section can easily pass through the movable hole. When the first section enters the locking hole, the larger transverse dimension of the second section prevents the connecting member from directly exiting the locking hole, and the first section can also rotate freely in the locking hole, facilitating the adjustment of the position of the blade.

[0008] Further, the length of the first section is H1, the thickness of the blade is H2, and 1.01H2 ≤ H1 ≤ 3H2.

[0009] Adopting the foregoing technical solution, the length of the first section is reasonably set so that when the blade moves towards the locking hole, the connecting member will not interfere with the blade in contact, ensuring the installation of the blade. Also, the same connecting member can adapt to blades of different thicknesses, improving the versatility and flexibility of the connecting member. If the length of the first section is less than 1.01H2, the first section cannot fully pass through the blade. When the blade moves, the second section will contact the blade, causing the first section to be unable to move into the locking hole. If the length of the first section is greater than 3H2, the length of the connecting member relative to the part of the blade close to the ground is too large, and the connecting member will contact the ground first relative to the blade, restricting the cutting height of the blade.

[0010] Further, the limiting member includes an elastic arm, the fixed end of the elastic arm is located on one side of the movable hole, the movable end of the elastic arm is located on one side of the locking hole, and an elastic space for accommodating the deformation of the elastic arm is provided on the side of the elastic arm.

[0011] Adopting the foregoing technical solution, the design of the elastic arm allows the movable end of the elastic arm to be squeezed during the installation process of the connecting member, causing it to deform temporarily, enabling the connecting member to pass through the locking hole. Once the connecting member completely enters the locking hole, the elastic arm returns to its original state and automatically locks the connecting member in the locking hole, achieving automatic locking without additional operations. Similarly, when disassembling, squeezing the movable end of the elastic arm again to deform it can release the connecting member, realizing quick disassembly, simplifying the blade replacement process. Secondly, the existence of the elastic space provides the necessary space for the deformation of the elastic arm when it is subjected to external forces, ensuring that the elastic arm can complete the deformation smoothly without being damaged due to lack of sufficient space.

[0012] Further, a convex point is provided on the movable end of the elastic arm, and when the connecting member is located in the locking hole, the convex point abuts against the connecting member.

[0013] With the foregoing technical solution, the direct contact between the bump and the connecting member increases the frictional force, ensuring the stable position of the connecting member in the locking hole, reducing the possibility of loosening caused by vibration or external force. The design of the bump can prevent the connecting member from moving in the reverse direction without squeezing the elastic arm, that is, without human intervention, the connecting member will not withdraw from the locking hole by itself, improving safety.

[0014] Further, when the elastic arm is reset, the dimension of the connecting section at the bump is D1, and the lateral dimension of the first section is D2, where 0.7D2 ≤ D1 ≤ 0.99D2.

[0015] With the above technical solution, by making D1 slightly smaller than D2 (0.7D2 to 0.99D2), when the first section of the connecting member enters the locking hole through the moving hole, it needs to overcome a certain resistance, thus ensuring the stable fixation of the connecting member in the locking hole and preventing loosening during use. If D1 < 0.7D2, the elastic arm needs a large amount of deformation to allow the connecting member to pass through, resulting in a large force required for the blade to move, making the disassembly and assembly of the blade relatively laborious. If D2 > 0.99D2, the connecting member can easily disengage from the locking hole, and the installation of the blade is unreliable.

[0016] Further, the connecting member includes a stepped nut and a screw. The stepped nut includes a stepped portion and a nut portion extending from the stepped portion. The stepped portion is fixed on the tool disc. The screw includes a head and a threaded portion. The threaded portion is inserted into the nut portion and is threadedly connected to the nut portion. The nut portion forms the first section, and the head forms the second section.

[0017] With the above technical solution, by adjusting the length of the screw and the depth of the nut portion, it is possible to adapt to blades of different thicknesses, improving the versatility and flexibility of the connecting member.

[0018] Further, each of the locking holes is communicated with a moving hole; or, there are at least two locking holes, and the at least two locking holes are communicated with the same moving hole.

[0019] With the above technical solution, each locking hole is connected to an independent moving hole, which means that the operation of each connecting member is independent and will not interfere with each other, improving the flexibility and controllability of the system during operation; or, multiple locking holes sharing the same moving hole can save space on the blade, making the design more compact, suitable for application scenarios with limited space, and can also form multi-point fixation for the blade, making the installation of the blade more reliable.

[0020] Further, one or more connecting members are pre-installed on the tool disc, and the positions of the multiple connecting members on the tool disc are independent of each other.

[0021] With the above technical solution, multiple independent connecting pieces can provide more uniform supporting force, ensuring the stable fixation of the blade on the cutter head. Especially under the working condition of high-speed rotation, it can reduce vibration and improve the cutting accuracy and stability.

[0022] Another object of the present utility model is to disclose a lawn mower, which includes a frame body and a cutter head assembly arranged at the bottom of the frame body. The cutter head assembly includes the tool-free quick-change blade structure described in any one of the above technical solutions.

[0023] With the above technical solution, the tool-free quick-change blade structure allows users to replace the blade without using any tools, greatly shortening the replacement time, improving the on-site operation efficiency of the lawn mower, and also avoiding the problem that grass clippings and dirt will adhere to the screws, resulting in difficult disassembly of the screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present utility model will be further described below with reference to the accompanying drawings:

[0025] Figure 1 It is a schematic structural view of the connecting piece located in the movable hole in the tool-free quick-change blade structure of the present utility model;

[0026] Figure 2 It is a schematic structural view of the connecting piece located in the locking hole in the tool-free quick-change blade structure of the present utility model;

[0027] Figure 3 It is a schematic structural view of the blade installed on the cutter head in the tool-free quick-change blade structure of the present utility model;

[0028] Figure 4 It is an exploded view of the tool-free quick-change blade structure of the present utility model;

[0029] Figure 5 It is a schematic structural view of the stepped nut of the present utility model;

[0030] Figure 6 It is a schematic structural view of the screw of the present utility model;

[0031] Figure 7 It is a schematic structural view of one of the blades of the present utility model;

[0032] Figure 8 It is a schematic structural view of another perspective of one of the blades of the present utility model;

[0033] Figure 9 It is a schematic structural view of another blade of the present utility model;

[0034] In the figure, 10 is a cutter head; 11 is a mounting hole; 20 is a blade; 21 is a movable hole; 22 is a locking hole; 23 is a connecting section; 24 is a limiting member; 25 is an elastic arm; 26 is a bump; 27 is an elastic space; 30 is a connecting member; 31 is a stepped nut; 32 is a stepped portion; 33 is a nut portion; 34 is a first section; 35 is a screw; 36 is a head; 37 is a threaded portion. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model.

[0036] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present utility model and the above accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.

[0037] It should be understood that in various embodiments of the present utility model, regarding the magnitudes of the serial numbers of the various processes, it does not mean the sequence of execution is prior or posterior. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present utility model.

[0038] It should be understood that in the present utility model, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] It should be understood that in the present utility model, "a plurality of" means two or more. "And / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. "Including X, Y and Z", "including X, Y, Z" means that all of X, Y, and Z are included, "including X, Y or Z" means including any one of X, Y, and Z, and "including X, Y and / or Z" means including any one or any two or all three of X, Y, and Z.

[0040] The technical solution of the present utility model will be described in detail below with specific embodiments. These specific embodiments can be combined or replaced according to actual situations. For the same or similar concepts or processes, they may not be described in some embodiments.

[0041] Embodiment 1:

[0042] As Figures 1 to 8 shown, the present utility model provides a structure for quickly replacing a blade 20 without tools, including a cutter head 10 and a blade 20. The blade 20 is provided with a movable hole 21 and a locking hole 22 with a diameter smaller than that of the movable hole 21. The movable hole 21 and the locking hole 22 are communicated through a connecting section 23. The connecting section 23 is provided with a limiting member 24. A connecting member 30 is pre-installed on the cutter head 10. The connecting member 30 can pass through the movable hole 21. When the blade 20 moves relative to the cutter head 10, the connecting member 30 forces the limiting member 24 to shift so that the connecting member 30 can enter and exit the locking hole 22, and the limiting member 24 resets to limit and lock the connecting member 30 in the locking hole 22.

[0043] The user can first sleeved the blade 20 on the connecting member 30 through the movable hole 21, and then move the blade 20 to force the connecting member 30 to force the limiting member 24 to shift so that the connecting member 30 enters the locking hole 22. The limiting member 24 resets to limit and lock the connecting member 30 in the locking hole 22, realizing the installation of the blade 20. On the contrary, move the blade 20 to force the connecting member 30 to force the limiting member 24 to shift so that the connecting member 30 disengages from the locking hole 22, and the connecting member 30 disengages from the blade 20 through the movable hole 21, realizing the disassembly of the blade 20. This simplifies the replacement steps, reduces the operation difficulty. The user can replace the blade 20 by hand, which is more convenient. There is no need to find and use tools such as screwdrivers and wrenches, and there is no need to screw the screw 35, improving the work efficiency and greatly shortening the time for replacing the blade 20.

[0044] It should be noted that the movable hole 21 and the locking hole 22 are arranged side by side along the length direction of the blade 20. The user can disassemble and assemble by linearly moving the blade 20, and the installation action of the blade 20 is simpler.

[0045] It should be noted that the connecting section 23 can be linear. The user needs to move linearly to switch the connecting member 30 between the movable hole 21 and the locking hole 22. Of course, the connecting section 23 can also be arc-shaped. The user needs to move the blade 20 along the arc direction to switch between the movable hole 21 and the locking hole 22. The arc-shaped inner wall of the connecting section 23 can limit the connecting member 30, increasing the difficulty of the blade 20 loosening and the connecting member 30 disengaging from the locking hole 22.

[0046] Among them, the connecting member 30 includes a first section 34 along the length direction and a second section with a transverse dimension larger than that of the first section 34. The transverse dimensions of the first section 34 are all smaller than the diameter of the movable hole 21 and the diameter of the locking hole 22. The transverse dimension of the second section is smaller than the diameter of the movable hole 21 and larger than the diameter of the locking hole 22. Both the first section 34 and the second section can easily pass through the movable hole 21. The first section 34 enters the locking hole 22 from the movable hole 21 and can freely rotate in the locking hole 22, facilitating the adjustment of the position of the blade 20 so that the blade 20 is adjusted to a preset position on the cutter head 10. When the first section 34 enters the locking hole 22, the larger transverse dimension of the second section prevents the connecting member 30 from directly exiting from the locking hole 22.

[0047] Specifically, the limiting member 24 includes an elastic arm 25. The fixed end of the elastic arm 25 is located on one side of the movable hole 21, and the movable end of the elastic arm 25 is located on one side of the locking hole 22. The design of the elastic arm 25 allows the connecting member 30 to squeeze the movable end of the elastic arm 25 during installation, causing it to deform temporarily, enabling the connecting member 30 to pass through the locking hole 22. Once the connecting member 30 completely enters the locking hole 22, the elastic arm 25 returns to its original shape and automatically locks the connecting member 30 in the locking hole 22, achieving automatic locking without additional operations. Similarly, during disassembly, squeezing the movable end of the elastic arm 25 again to deform it can release the connecting member 30, achieving rapid disassembly and simplifying the replacement process of the blade 20. There is an elastic space 27 on the side of the elastic arm 25 that can accommodate the deformation of the elastic arm 25. The existence of the elastic space 27 provides the necessary space for the deformation of the elastic arm 25 when subjected to external forces, ensuring that the elastic arm 25 can complete the deformation smoothly without being damaged due to lack of sufficient space.

[0048] To enhance the limiting effect, an elastic arm 25 is provided on each side of the connecting section 23. The bilateral elastic arms 25 can provide a more stable limiting effect, ensuring that the position of the connecting member 30 in the locking hole 22 is more stable, reducing the possibility of loosening caused by vibration or external forces. The design of the bilateral elastic arms 25 provides double protection. Even if one side of the elastic arm 25 fails, the other side can still play a limiting role, improving the safety of the system.

[0049] To further enhance the installation stability of the blade 20, a convex point 26 is provided on the movable end of the elastic arm 25. When the connecting member 30 is located in the locking hole 22, the convex point 26 abuts against the connecting member 30. The direct contact between the convex point 26 and the connecting member 30 increases the friction force, ensuring that the position of the connecting member 30 in the locking hole 22 is stable, reducing the possibility of loosening caused by vibration or external forces. The design of the convex point 26 can prevent the connecting member 30 from moving in the reverse direction without squeezing the elastic arm 25, that is, without human intervention, the connecting member 30 will not exit from the locking hole 22 by itself, improving safety.

[0050] Among them, when the elastic arm 25 is reset, the dimension of the connecting section 23 at the bump 26 is D1, and the lateral dimension of the first section 34 is D2, where 0.7D2 ≤ D1 ≤ 0.99D2. If D1 < 0.7D2, a relatively large deformation of the elastic arm 25 is required for the connector 30 to pass through, resulting in a relatively large force needed for the blade 20 to move, making the disassembly and assembly of the blade 20 rather laborious. If D1 > 0.99D2, the connector 30 can easily disengage from the locking hole 22, and the installation of the blade 20 is unreliable.

[0051] Preferably, D1 = 0.8D2, so that when the first section 34 of the connector 30 enters the locking hole 22 through the moving hole 21, it needs to overcome a certain resistance, thereby ensuring the firm fixation of the connector 30 within the locking hole 22. The bump 26 abuts against the first section 34 to achieve the locking of the connector 30, thus realizing the installation of the blade 20 and preventing loosening during use. When the blade 20 needs to be installed or disassembled, by externally squeezing the elastic clamping point to the deformed position, at this time D1 ≥ D2, and the connector 30 can easily pass through the connecting section 23 to achieve rapid installation and disassembly without the need for tools. Of course, D1 can also be a suitable dimension such as 0.75D2, 0.85D2, etc.

[0052] To ensure the normal installation of the blade 20, the length of the first section 34 is H1, and the thickness of the blade 20 is H2, where 1.01H2 ≤ H1 ≤ 3H2. If the length of the first section 34 is less than 1.01H2, the first section 34 cannot fully pass through the blade 20. When the blade 20 moves towards the locking hole 22, the second section will abut against the blade 20, resulting in the first section 34 being unable to move into the locking hole 22. If the length of the first section 34 is greater than 3H2, the length of the connector 30 relative to the part of the blade 20 close to the ground is too large, and the connector 30 relative to the blade 10 abuts against the ground first, restricting the cutting height of the blade 20.

[0053] Preferably, H1 = 1.5H2, reasonably setting the length of the first section 34 to ensure that the first section 34 passes through the blade 20, so that when the blade 20 moves towards the locking hole 22, the connector 30 will not interfere with the blade 20 by abutting, ensuring the installation of the blade 20. It can also enable the same connector 30 to adapt to blades 20 of different thicknesses, improving the versatility and flexibility of the connector 30. Of course, H1 can also be a suitable dimension such as 2H2, 2.5H2, etc.

[0054] Also, the width of the connecting section 23 is 0.5H2 - 3H2 to ensure the structural strength of the connecting section 23.

[0055] To achieve the installation of multiple blades 20, multiple connecting members 30 are pre-installed on the cutter head 10. The positions of the multiple connecting members 30 on the cutter head 10 are independent of each other. The multiple independent connecting members 30 can provide a more uniform supporting force, ensuring the stable fixation of the blades 20 on the cutter head 10. Especially under the working condition of high-speed rotation, vibration can be reduced, and the cutting accuracy and stability can be improved.

[0056] It should be noted that two, three, four, five, six or other appropriate numbers of connecting members 30 can be pre-installed on the cutter head 10. The multiple connecting members 30 can also be arranged in an array along the circumferential direction of the cutter head 10, so that the blades 20 are arranged in an array on the cutter head 10, and the cutting is more uniform.

[0057] Furthermore, each locking hole 22 is communicated with an active hole 21. Each locking hole 22 is connected to an independent active hole 21, which means that the operation of each connecting member 30 is independent and will not interfere with each other, improving the flexibility and controllability of the system during the operation process.

[0058] Among them, the connecting member 30 includes a stepped nut 31 and a screw 35. The stepped nut 31 includes a stepped portion 32 and a nut portion 33 extending from the stepped portion 32. The stepped portion 32 is fixed on the cutter head 10. The screw 35 includes a head 36 and a threaded portion 37. The threaded portion 37 is inserted into the nut portion 33 and is threadedly connected to the nut portion 33. The nut portion 33 forms a first section 34, and the head 36 forms a second section. Also, during use, by adjusting the length of the screw 35 and the depth of the nut portion 33, different thicknesses of blades 20 can be adapted, improving the versatility and flexibility of the connecting member 30.

[0059] To facilitate the installation of the stepped nut 31, an installation hole 11 is provided on the cutter head 10. The stepped portion 32 is installed by being snapped into the installation hole 11.

[0060] The steps for installing the blade 20 are as follows:

[0061] Step 1: As shown in [Figure reference], the active hole 21 of the blade 20 passes through the head 36 of the screw 35 entirely and is sleeved on the connecting member 30. Then, move the blade 20 along the length direction of the blade 20, that is, move it towards the center of the circle of the cutter head 10, so that the active end of the elastic arm 25 is temporarily deformed. As shown in [Figure reference], make the first section 34 enter the locking hole 22, and then the elastic arm 25 resets, and the convex point 26 forms a limit on the first section 34; Figure 1 As shown in [Figure reference], the active hole 21 of the blade 20 passes through the head 36 of the screw 35 entirely and is sleeved on the connecting member 30. Then, move the blade 20 along the length direction of the blade 20, that is, move it towards the center of the circle of the cutter head 10, so that the active end of the elastic arm 25 is temporarily deformed. As shown in [Figure reference], make the first section 34 enter the locking hole 22, and then the elastic arm 25 resets, and the convex point 26 forms a limit on the first section 34; Figure 2 As shown in [Figure reference], make the first section 34 enter the locking hole 22, and then the elastic arm 25 resets, and the convex point 26 forms a limit on the first section 34;

[0062] Step 2: Rotate the blade 20. As shown in [Figure reference], move the blade 20 out of one side of the active hole 21, and the projection of the blade 20 on the horizontal plane is partially located outside the projection of the cutter head 10 on the horizontal plane to complete the installation. Figure 3 As shown in [Figure reference], move the blade 20 out of one side of the active hole 21, and the projection of the blade 20 on the horizontal plane is partially located outside the projection of the cutter head 10 on the horizontal plane to complete the installation.

[0063] The steps for disassembling the blade 20 are as follows:

[0064] Step 1: Move the blade 20 along the length direction of the blade 20, that is, move it towards the center of the cutter disc 10, so that the movable end of the elastic arm 25 is temporarily deformed, and the first section 34 can enter the movable hole 21 through the connecting section 23;

[0065] Step 2: Move the blade 20 along the length direction of the connecting piece 30, the connecting piece 30 disengages from the movable hole 21, and the blade 20 is removed from the cutter disc 10.

[0066] It should be noted that since there are various arrangements of the positions of the locking hole 22 and the movable hole 21 on the blade 20, the moving direction of the blade 20 in Step 1 of the above installation and disassembly of the blade 20 also changes correspondingly, not limited to moving towards the center of the cutter disc 10, and can also be moving away from the center of the cutter disc 10, etc., only need to satisfy that the connecting piece 30 enters the locking hole 22 from the movable hole 21 or enters the movable hole 21 from the locking hole 22.

[0067] It can be understood that in other embodiments, one side of the connecting section is provided with an elastic arm, and the other side of the connecting section is not provided with an elastic arm. The elastic arm on one side occupies less space, is more suitable for application scenarios with limited space, can also reduce materials and manufacturing processes, and reduce the overall cost.

[0068] It can be understood that in other embodiments, a connecting piece can also be pre-installed on the cutter disc to realize the installation of a single blade. Of course, multiple blades can also be stacked and installed through one connecting piece.

[0069] As Figure 9 shown, it can be understood that in other embodiments, there are at least two locking holes 22, and at least two locking holes 22 communicate with the same movable hole 21. Sharing the same movable hole 21 by multiple locking holes 22 can save space on the blade 20, make the design more compact, be suitable for application scenarios with limited space, and can also form multi-point fixation for the blade 20, making the installation of the blade 20 more reliable.

[0070] Embodiment 2:

[0071] In this embodiment, a lawn mower is disclosed, which includes a frame body and a cutter disc assembly arranged at the bottom of the frame body. The cutter disc assembly includes the tool-free quick-change blade structure of the above embodiment. The tool-free quick-change blade structure allows the user to replace the blade without using any tools, greatly shortening the replacement time, improving the on-site operation efficiency of the lawn mower, and can also avoid the problem that grass clippings and dirt will adhere to the screws, resulting in difficult disassembly of the screws.

[0072] In addition to the above preferred embodiments, there are other implementation manners of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the scope of protection claimed by the present utility model.

Claims

1. A tool-free quick-change blade structure, characterized in that: The invention comprises a blade (10) and a cutter disc (20), wherein the blade (20) is provided with a movable hole (21) and a locking hole (22) having a diameter smaller than the movable hole (21), wherein the movable hole (21) and the locking hole (22) are connected via a connecting section (23), wherein the connecting section (23) is provided with a limiting member (24), wherein a connecting member (30) is pre-installed on the cutter disc (10), wherein the connecting member (30) can pass through the movable hole (21), wherein when the blade (20) moves relative to the cutter disc (10), the connecting member (30) forces the limiting member (24) to shift so that the connecting member (30) can enter and exit the locking hole (22), and wherein the limiting member (24) is reset so as to limit and lock the connecting member (30) in the locking hole (22).

2. The tool-free quick-change blade structure according to claim 1, characterized in that: The connecting piece (30) comprises a first section (34) and a second section with a transverse dimension larger than the first section (34) along the length direction; the transverse dimension of the first section (34) is smaller than the diameter of the movable hole (21) and the diameter of the locking hole (22); the transverse dimension of the second section is smaller than the diameter of the movable hole (21) and larger than the diameter of the locking hole (22); both the first section (34) and the second section can pass through the movable hole (21); the first section (34) enters the locking hole (22) from the movable hole (21) and can rotate freely in the locking hole (22).

3. The tool-free quick-change blade structure according to claim 2, characterized in that: The length of the first section (34) is H1, the thickness of the blade (20) is H2, and 1.01H2≤H1≤3H2.

4. The tool-free quick-change blade structure according to claim 2, characterized in that: The limiting member (24) comprises an elastic arm (25), the fixed end of the elastic arm (25) is located on one side of the movable hole (21), the movable end of the elastic arm (25) is located on one side of the locking hole (22), and the side of the elastic arm (25) is provided with an elastic space (27) capable of accommodating deformation of the elastic arm (25).

5. The tool-free quick-change blade structure according to claim 4, characterized in that: A convex point (26) is provided on the movable end of the elastic arm (25), and when the connecting member (30) is located in the locking hole (22), the convex point (26) abuts against the connecting member (30).

6. The tool-free quick-change blade structure according to claim 5, characterized in that: When the elastic arm (25) is reset, the dimension of the connecting section (23) at the convex point (26) is D1, the transverse dimension of the first section (34) is D2, and 0.7D2≤D1≤0.99D2.

7. The tool-free quick-change blade structure according to claim 2, characterized in that: The connecting member (30) comprises a step nut (31) and a screw (35); the step nut (31) comprises a step portion (32) and a nut portion (33) formed by extending the step portion (32); the step portion (32) is fixed on the cutter disc (10); the screw (35) comprises a head portion (36) and a threaded portion (37); the threaded portion (37) is inserted into the nut portion (33) and is threadedly connected to the nut portion (33); the nut portion (33) forms a first section (34) and the head portion (36) forms a second section.

8. The tool-free quick-change blade structure according to claim 1, characterized in that: Each of the locking holes (22) is connected to a movable hole (21); or, at least two locking holes (22) are provided, and the at least two locking holes (22) are connected to the same movable hole (21).

9. The tool-free quick-change blade structure according to claim 1, characterized in that: One or more connecting members (30) are pre-installed on the cutter disc (10), and the positions of the multiple connecting members (30) on the cutter disc (10) are independent of each other.

10. A lawn mower, comprising a frame body and a cutter disc assembly arranged at the bottom of the frame body, characterized in that: The blade disc (10) assembly comprises a tool-free quick-change blade (20) structure according to any one of claims 1 to 9.

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