Knocking pay-off type grass mowing head and grass mowing machine

Abstract

The invention provides a knocking pay-off type grass mowing head and a grass mowing machine, and belongs to the technical field of grass mowing equipment. The mounting shell can synchronously rotate along with the rotating head, a placement cavity is formed between the mounting shell and the rotating head, a bobbin is movably arranged in the placement cavity, a knocking head is fixedly arranged on the bobbin, and the knocking head penetrates through the mounting shell to extend out; the knocking pay-off assembly comprises a first abutting part and a second abutting part, the first abutting part and the second abutting part are arranged at the two ends of the bobbin in the rotating axis direction of the mounting shell correspondingly, a first limiting space is formed in the rotating head, and a second limiting space is formed in the mounting shell; the pay-off device has the advantages that the knocking head is waved to contact with the ground or other objects, and the spool realizes pay-off due to inertia; synchronous rotation between the spool and the rotating head is guaranteed, and meanwhile the pay-off state can be rapidly switched to when needed.

Description

Technical Field

[0001] The present invention belongs to the technical field of grass cutting equipment, and particularly relates to a percussion wire feeding type grass head and a lawn mower. Background Art

[0002] In the fields of garden maintenance and lawn mowing, a grass head is a common tool component, which is widely used in equipment such as lawn mowers and edgers. A traditional grass head usually includes a rotating head and a spool mounted thereon, and a cutting nylon line or other flexible material is wound around the spool. During operation, the cutting line extends outwards by the rotation of the spool, thereby completing the trimming of the lawn or weeds.

[0003] However, the grass heads in the prior art have some deficiencies. For example, during use, the cutting line will gradually shorten due to wear, and frequent wire feeding operations are required to ensure work efficiency. Currently, the common wire feeding methods include manual wire feeding and automatic wire feeding. Manual wire feeding requires the user to stop the equipment and manually pull out the cutting line, which is cumbersome and inefficient; while automatic wire feeding usually relies on a mechanical triggering mechanism to achieve, but the existing automatic wire feeding mechanisms often have complex structures, poor reliability, and are prone to problems such as unsmooth wire feeding or spool jamming. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems existing in the prior art, and propose a percussion wire feeding type grass head with a simple structure and capable of quickly feeding wire.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A percussion wire feeding type grass head, comprising:

[0006] A rotating head;

[0007] An installation shell, the installation shell can rotate synchronously with the rotating head, a placement cavity is formed between the installation shell and the rotating head, a spool is movably arranged in the placement cavity, a percussion head is fixedly arranged on the spool, and the percussion head passes through the installation shell and extends out;

[0008] A percussion wire feeding assembly, the percussion wire feeding assembly includes a first abutting portion and a second abutting portion, the first abutting portion and the second abutting portion are respectively arranged at both ends of the spool along the rotation axis direction of the installation shell, a first limiting space is arranged on the rotating head, and a second limiting space is arranged on the installation shell;

[0009] Wherein, the second abutting portion is in contact connection with the space wall of the second limiting space, while the first abutting portion is not in contact with the first limiting space, and the spool rotates synchronously with the installation shell;

[0010] After the striking head is stressed by striking, the second abutting part will disengage from the second limiting space, and the first abutting part will extend into the first limiting space as the striking head moves until it abuts against the wall of the first limiting space, so as to realize the wire release of the spool.

[0011] In the above-mentioned striking wire-release type grass cutting head, when the second abutting part is disengaged from the wall of the second limiting space, the first abutting part generates an axial displacement and is embedded in the corresponding first limiting space. At this time, a movement gap is formed between the radial side wall of the first abutting part and the limiting wall of the first limiting space, so that the spool and the rotating head rotate relative to each other to perform the wire release operation.

[0012] In the above-mentioned striking wire-release type grass cutting head, the first limiting space includes a plurality of first limiting areas arranged at equal intervals in a ring shape, and the second limiting space includes a plurality of second limiting areas arranged at equal intervals in a ring shape.

[0013] In the above-mentioned striking wire-release type grass cutting head, the first abutting part includes first abutting blocks equal in number to and corresponding in position to the first limiting areas one by one; the second abutting part includes second abutting blocks equal in number to and corresponding in position to the second limiting areas one by one.

[0014] In the above-mentioned striking wire-release type grass cutting head, a abutting elastic member is arranged between the striking head and the rotating head. When the striking head generates an axial displacement in the direction of the placing cavity under the action of an external force, the abutting elastic member undergoes a compressive deformation to store elastic potential energy; when the external force acting on the striking head is removed, the abutting elastic member drives the striking head to displace in the reverse direction to the initial working position through an elastic restoring force.

[0015] In the above-mentioned striking wire-release type grass cutting head, a connection card slot is arranged on one of the mounting shell and the rotating head, and a connection buckle is arranged on the other of the two. The connection card slot and the connection buckle are clamped and fixed, and at the same time, they are separable from each other.

[0016] In the above-mentioned striking wire-release type grass cutting head, one of the rotating head and the mounting shell is provided with a mounting part, and a mounting cavity is arranged in the mounting part. The abutting elastic member is located in the mounting cavity. One end of the abutting elastic member abuts against the bottom wall of the mounting cavity, and the other end of the abutting elastic member abuts against the other of the rotating head and the mounting shell.

[0017] In the above-mentioned striking wire-release type grass cutting head, a support column is arranged in the mounting cavity, and the abutting elastic member includes an abutting spring, and the abutting spring is sleeved on the support column.

[0018] In the above-mentioned percussion wire-releasing type grass cutting head, along the axial direction of the rotating head, the abutting spring has a gradually changing diameter such that the closer it is to the bottom wall of the installation cavity, the smaller the diameter.

[0019] A lawn mower includes the above-mentioned percussion wire-releasing type grass cutting head.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: During the normal grass cutting process of the grass cutting head, the second abutting portion is in contact connection with the wall of the second limiting space, so that the installation shell pushes the spool to rotate synchronously; when wire release is required, the percussion head is waved to contact the ground or other objects, so that the percussion head retracts into the installation shell. Then, the second abutting portion is disengaged from the wall of the second limiting space, and the two no longer contact each other, while the first abutting portion extends into the first limiting space until it is in contact connection with the wall of the first limiting space. During the process from the disconnection of the second abutting portion from the wall of the second limiting space to the contact connection of the first abutting portion with the wall of the first limiting space, the spool releases wire due to inertia; while ensuring the synchronous rotation between the spool and the rotating head, it can quickly switch to the wire release state when needed. Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of the percussion wire-releasing type grass cutting head;

[0022] Figure 2 is a three-dimensional structural schematic diagram of the rotating head;

[0023] Figure 3 is a three-dimensional structural schematic diagram of the spool;

[0024] Figure 4 is a three-dimensional structural schematic diagram of the installation shell for installing the grass cutting rope;

[0025] Figure 5 is Figure 4 the three-dimensional structural schematic diagram of the installation shell in

[0026] Figure 6 is a state schematic diagram of one of the second abutting portions during the normal process of the grass cutting head;

[0027] Figure 7 is Figure 6 the state schematic diagram of one of the first abutting portions when the percussion head is stressed in

[0028] Figure 8 is a three-dimensional structural schematic diagram of the installation shell for installing the grass cutting blade;

[0029] Figure 9 is Figure 8 the cross-sectional structural schematic diagram after connection with the rotating head;

[0030] Figure 10 It is a schematic cross-sectional structure diagram after the installation shell for installing the trimming line is connected to the rotating head;

[0031] Figure 11 It is a schematic three-dimensional structure diagram of the trimming head after installing the trimming blade;

[0032] Figure 12 is Figure 11 schematic cross-sectional structure diagram;

[0033] Figure 13 It is a schematic three-dimensional structure diagram of the trimming blade.

[0034] In the figure, 100, rotating head; 101, abutting elastic member; 102, first limiting space; 103, first limiting protrusion; 200, installation shell; 201, placement cavity; 202, second limiting space; 203, second limiting protrusion; 300, spool; 301, knocking head; 302, first abutting portion; 303, second abutting portion; 400, connecting card slot; 401, installation portion; 402, installation cavity; 403, support column; 500, connecting buckle; 501, abutting protrusion; 502, insertion cavity; 503, connecting cavity; 600, installation member; 601, connecting column; 602, trimming blade; 604, connecting portion; 605, installation hole; 606, aisle hole; 607, abutting convex portion; 608, abutting concave portion; 609, connecting surface. Detailed implementation manners

[0035] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0037] As Figures 1 - 13 shown, a knocking and wire-releasing type trimming head includes:

[0038] Rotating head 100;

[0039] Installation shell 200, the installation shell 200 can rotate synchronously with the rotating head 100. A placement cavity 201 is formed between the installation shell 200 and the rotating head 100. A spool 300 is movably arranged in the placement cavity 201, and a knocking head 301 is fixedly arranged on the spool 300, and the knocking head 301 passes through the installation shell 200 and extends out.

[0040] Strike the wire pay-off assembly. The wire pay-off assembly includes a first abutting portion 302 and a second abutting portion 303. The first abutting portion 302 and the second abutting portion 303 are respectively arranged at both ends of the spool 300 along the rotation axis direction of the mounting shell 200. A first limiting space 102 is provided on the rotating head 100, and a second limiting space 202 is provided on the mounting shell 200;

[0041] Wherein, the second abutting portion 303 is in abutting connection with the space wall of the second limiting space 202, while the first abutting portion 302 is not in contact with the first limiting space 102, and the spool 300 and the mounting shell 200 rotate synchronously;

[0042] After the striking head 301 is stressed by striking, the second abutting portion 303 will disengage from the second limiting space 202, and the first abutting portion 302 will extend into the first limiting space 102 as the striking head 301 moves until it abuts against the space wall of the first limiting space 102, so as to realize wire pay-off of the spool 300.

[0043] In this embodiment, during the normal grass cutting process of the grass cutting head, the second abutting portion 303 is in abutting connection with the space wall of the second limiting space 202, so that the mounting shell 200 pushes the spool 300 to rotate synchronously; when wire pay-off is required, wave the striking head 301 to contact the ground or other objects, so that the striking head 301 retracts into the mounting shell 200. Then, the second abutting portion 303 disengages from the space wall of the second limiting space 202, and the two are no longer in contact, while the first abutting portion 302 extends into the first limiting space 102 until it abuts against the space wall of the first limiting space 102. During the process that the second abutting portion 303 disengages from the abutting connection with the space wall of the second limiting space 202 until the first abutting portion 302 abuts against the space wall of the first limiting space 102, the spool 300 realizes wire pay-off due to inertia; while ensuring the synchronous rotation between the spool 300 and the rotating head 100, it can be quickly switched to the wire pay-off state when needed.

[0044] Specifically, when the second abutting portion 303 disengages from the abutting connection with the space wall of the second limiting space 202, the first abutting portion 302 generates an axial displacement and is embedded in the corresponding first limiting space 102. At this time, a movement gap is formed between the radial side wall of the first abutting portion 302 and the space wall of the first limiting space 102, so that the spool 300 and the rotating head 100 rotate relatively to perform the wire pay-off operation.

[0045] In this embodiment, a movement gap formed between the radial side wall of the first abutting portion 302 and the space wall of the first limiting space 102 enables the spool 300 to rotate relative to the rotating head 100 when the rotating head 100 continues to rotate, thereby realizing the function of rapid wire release. Specifically, in the normal working state, the second abutting portion 303 remains in contact with the space wall of the second limiting space 202 to ensure that the mounting shell 200 and the spool 300 can rotate synchronously, maintaining the efficient operation of the grass trimming head. When wire release is required, the striking head 301 is triggered to switch under the action of an external force: the second abutting portion 303 disengages from the second limiting space 202, and the first abutting portion 302 enters the first limiting space 102. Due to the existence of the movement gap, the spool 300 is no longer completely constrained but can freely rotate relative to the rotating head 100 by the action of inertia to complete the wire release operation.

[0046] Preferably, the first limiting space 102 includes a plurality of first limiting regions arranged at intervals in a ring shape, and the second limiting space 202 includes a plurality of second limiting regions arranged at intervals in a ring shape.

[0047] In this embodiment, by designing the first limiting region and the second limiting region to be arranged at intervals in a ring shape, it can be ensured that the first abutting portion 302 and the second abutting portion 303 can quickly find the corresponding limiting regions, thereby realizing precise positioning.

[0048] As an alternative solution, when the lengths of the respective limiting regions are set to be equal, the first abutting portion 302 has the same contact area and movement gap when embedded in different limiting regions, thereby ensuring that the triggering conditions and results of each wire release operation are consistent; as another alternative solution, the lengths of the respective limiting regions or at least one limiting region can also be set to be unequal to the lengths of other limiting regions. If the lengths of the limiting regions are not equal, the functions of different regions can be designed differently according to actual needs. The limiting region can be set to a longer length to provide a larger movement gap for realizing a longer wire release distance; or set to a shorter length for realizing more precise wire release control. This non-equal length design provides more possibilities for the function expansion of the device, enabling it to adapt to different usage scenarios and user requirements.

[0049] More preferably, the first abutting portion 302 includes first abutting blocks that are equal in number to and in one-to-one correspondence with the first limiting regions, and the second abutting portion 303 includes second abutting blocks that are equal in number to and in one-to-one correspondence with the second limiting regions.

[0050] In this embodiment, since the number of the first abutting blocks is equal to that of the first limiting regions and the positions of the first abutting blocks and the first limiting regions correspond one by one, and the number of the second abutting blocks is equal to that of the second limiting regions and the positions of the second abutting blocks and the second limiting regions correspond one by one, during the use process, each first abutting block can be embedded into the corresponding first limiting region, and each second abutting block can stably cooperate with the corresponding second limiting region. This ensures the precise positioning of the knocking wire releasing assembly during operation and avoids functional failure caused by misalignment or deviation. Moreover, when a certain first limiting region or first abutting block is worn, damaged or has an error, the other first limiting regions and first abutting blocks can still work normally and continue to maintain the basic functions of the device. Similarly, the design of the second limiting regions and second abutting blocks also has a similar fault tolerance ability. This modular design greatly improves the reliability and service life of the system.

[0051] It should be noted that a plurality of first limiting protrusions 103 are annularly and spacedly distributed on the rotating head 100, and a first limiting space 102 is formed between two adjacent first limiting protrusions 103; a plurality of second limiting protrusions 203 are arranged in the mounting shell 200, and a second limiting space 202 is formed between two adjacent second limiting protrusions 203.

[0052] In this embodiment, the abutting portion and the limiting space can have various expression structures. For example, limiting grooves are provided on the rotating head 100 and the mounting shell 200 to form the limiting space, and the abutting portion can cooperate with the limiting groove to realize the wire releasing operation. In this application, as an alternative solution, in order not to increase the wall thickness of the mounting shell 200 and the rotating head 100, a plurality of first limiting protrusions 103 are annularly and spacedly distributed on the rotating head 100, and a plurality of second limiting protrusions 203 are annularly and spacedly distributed on the mounting shell 200, and a limiting space is formed between two adjacent limiting protrusions.

[0053] Further preferably, a abutting elastic member 101 is arranged between the knocking head 301 and the rotating head 100. When the knocking head 301 generates an axial displacement towards the placement cavity 201 under the action of an external force, the abutting elastic member 101 undergoes a compressive deformation to accumulate elastic potential energy. When the external force acting on the knocking head 301 is removed, the abutting elastic member 101 drives the knocking head 301 to displace reversely to the initial working position through an elastic restoring force.

[0054] In this embodiment, due to the elastic characteristics of the abutting elastic member 101, the knocking head 301 can quickly and automatically reset to the initial working position after being acted on by an external force, simplifying the operation process and ensuring that the device can return to the normal working state in a short time, thereby improving the working efficiency. The use of the abutting elastic member 101 effectively reduces the direct rigid collision between the knocking head 301 and other components, thereby reducing the risk of mechanical wear and prolonging the service life of the device.

[0055] Preferably, one of the mounting shell 200 and the rotating head 100 is provided with a connecting card slot 400, and the other of the two is provided with a connecting buckle 500. The connecting card slot 400 and the connecting buckle 500 are clamped and fixed, and at the same time, they can be separated from each other; this modular design enables users to flexibly switch between installing a grass cutting blade 602 or a grass cutting string on the mounting shell according to different operation requirements, without the need for additional tools or complex operation steps; moreover, users can complete the replacement of the mounting shell 200 through a simple clamping operation, quickly adapting to different operation scenarios.

[0056] Moreover, the existence of the abutting elastic member 101 enables the abutting elastic member 101 to be in a compressed energy storage state and apply a continuous pre-tightening force to the mounting shell 200 and the rotating head 100 when the rotating head 100 and the mounting shell 200 are fixed. This pre-tightening force keeps the connecting buckle 500 and the connecting card slot 400 in close contact, reducing the risk of loosening or detachment caused by vibration or external force; during the manufacturing process, there will inevitably be certain dimensional errors or assembly tolerances, and the elastic deformation characteristics of the abutting elastic member 101 can effectively compensate for these tolerances, ensuring that even in the case of slight dimensional differences, the close contact between the connecting components can be maintained, thereby improving the stability and reliability of the overall structure.

[0057] Further preferably, a support column 403 is provided in the mounting cavity 402, and the abutting elastic member 101 includes an abutting spring, and the abutting spring is sleeved on the support column 403.

[0058] In this embodiment, the support column 403 provides an accurate guiding path for the abutting spring, ensuring that the spring moves linearly during the compression and recovery processes, avoiding the spring from being skewed or distorted; moreover, the existence of the support column 403 can help quickly locate and fix the position of the abutting spring, simplifying the assembly process and improving production efficiency.

[0059] It is worth mentioning that along the axial direction of the rotating head 100, the abutting spring has a gradually changing diameter, the closer it is to the bottom wall of the mounting cavity 402, the smaller the diameter. Since the diameter of the abutting spring at the bottom wall position of the mounting cavity 402 is smaller, its positioning relative to the support column 403 is more accurate, which can effectively prevent the spring from shifting or tilting during operation, enhancing the stability of the entire system; moreover, as the spring diameter decreases approaching the bottom wall of the mounting cavity 402, it means that the stress borne here is more concentrated, which helps to provide a more balanced pressure distribution in the compressed state.

[0060] It should be noted that the detachable connection between the mounting shell 200 and the rotating head 100 enables the grass-cutting part on the rotating head 100 to be switched to a grass-cutting blade 602 or a grass-cutting rope. When the mounting shell 200 is installed with a grass-cutting rope, a connecting cavity 503 is provided on the striking head 301, and an abutting protrusion 501 is provided on the cavity wall of the connecting cavity 503. When the mounting shell 200 is fixed to the rotating head 100, the mounting portion 401 extends into the connecting cavity 503, and the abutting protrusion 501 is abutted and connected with the abutting elastic member 101.

[0061] In the present embodiment, the striking head 301 exists to realize the line-releasing operation by striking the striking head 301 to cause it to collide, so the striking head 301 will protrude relative to the mounting shell 200. In order to ensure that the elastic abutment force between the mounting shell 200 and the rotating head 100 remains the same regardless of whether the mowing blade 602 or the mowing rope is installed on the mounting shell 200, an abutment protrusion 501 is additionally provided in the striking head 301 to shorten the elastic abutment distance between the mounting shell 200 and the rotating head 100. Moreover, the existence of the abutment elastic member 101 in the rotating head 100 can also automatically reset the striking head 301 after it is struck and retracted.

[0062] It is worth mentioning that a plug-in cavity 502 with an opening at one end is provided on the abutting protrusion 501. When the straight-line distance between the striking head 301 and the rotating head 100 becomes smaller, the support column 403 extends into the plug-in cavity 502; a gap is left between the abutting protrusion 501 and the cavity wall of the connecting cavity 503 to facilitate the insertion of the mounting part 401.

[0063] When the mounting shell 200 is used to connect with the mowing blade 602, the rotating head 100 is fixedly provided with a mounting member 600, and the mounting member 600 is fixedly provided with a connecting column 601;

[0064] The grass cutting blade 602 is provided with a connecting portion 604, and the connecting portion 604 includes a mounting hole 605 and a passage hole 606 which are connected to each other, and the diameter of the mounting hole 605 is smaller than the diameter of the passage hole 606, so that the connecting column 601 passes through the passage hole 606 and is fixedly engaged with the mounting hole 605, thereby installing the grass cutting blade 602 on the output member; the connecting portion 604 also includes an abutting protrusion 607 provided on the side of the grass cutting blade 602;

[0065] When the mowing blade 602 moves relative to the mounting portion 401 , the abutting protrusion 607 will abut against the mounting portion 401 to prevent the connecting column 601 from being separated from the mounting hole 605 .

[0066] In this embodiment, the presence of the abutting convex portion 607 causes the connecting portion 604 on the grass trimming blade 602 to stop moving when the grass trimming blade 602 is laterally displaced by a certain distance, preventing the connecting column 601 from disengaging from the mounting hole 605 and causing the grass trimming blade 602 to disengage from the grass trimming head in the rotating state, greatly reducing the risk of accidental detachment of the grass trimming blade 602 during high-speed rotation.

[0067] It is worth mentioning that there are two abutting convex portions 607, which are respectively arranged on the opposite sides of the grass trimming blade 602 and are symmetrically arranged. However, only one abutting convex portion 607 can be in contact connection with the mounting portion 401 each time, ensuring that no matter which direction the grass trimming blade 602 is installed, one abutting convex portion 607 can be in contact with the mounting member 600; the presence of the two abutting convex portions 607 enables the grass trimming blade 602 to maintain uniform force in the axial direction during operation; moreover, even if one of the abutting convex portions 607 is damaged, the user can continue to use the other intact abutting convex portion 607 by flipping the grass trimming blade 602, increasing the durability and reliability of the product.

[0068] Further preferably, in the radial direction of the output member, the outer side surface of the mounting portion 401 is an arc surface, and the center of the arc of the outer side surface of the mounting portion 401 is located on the central axis of the connecting column 601. Then, even if the grass trimming blade 602 rotates relative to the connecting column 601, the abutting convex portion 607 can still maintain the abutting and anti-detachment effect with the mounting member 600.

[0069] Further preferably, on the side of the mounting member 600 where the mounting portion 401 is provided with the connecting column 601, there is an abutting concave portion 608, and the abutting convex portion 607 can extend into the abutting concave portion 608; wherein, when the grass trimming blade 602 moves, the abutting convex portion 607 can abut against the side surface of the mounting portion 401; along the axial direction of the output member, the grass trimming blade 602 deforms in the direction away from the abutting concave portion 608, and the abutting convex portion 607 can extend into the abutting concave portion 608.

[0070] In this embodiment, an abutment recess 608 is provided on the front side of the mounting member 600. The abutment protrusion 607 can extend into the abutment recess 608 only after the mowing blade 602 is deformed. Then, when the connecting post 601 extends into the passage hole 606 to connect with the mounting hole 605 or when the connecting post 601 is withdrawn from the mounting hole 605 into the passage hole 606, the mowing blade 602 only needs to be slightly deformed upwards to push the mowing blade 602 horizontally, thereby facilitating the installation or removal of the mowing blade 602. Moreover, when the mowing blade 602 is in a normally extended state, the abutment protrusion 607 cannot extend into the abutment recess 608. Then, during the use of the mowing blade 602, if the mowing blade 602 is disconnected from the connecting post 601, the side surface of the mounting member 600 can also abut and connect with the abutment protrusion 607 to block it.

[0071] Specifically, the connecting portion 604 includes a connecting surface 609, the abutting protrusion 607 is arranged on the connecting surface 609, and the abutting recess 608 has a bottom wall. When the mowing blade 602 is installed on the output member, with the connecting surface 609 as the reference plane, the straight-line distance between the end surface of the abutting protrusion 607 away from the connecting surface 609 and the connecting surface 609 is greater than the straight-line distance between the bottom wall and the connecting surface 609.

[0072] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0073] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0074] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A percussion wire-releasing type grass cutting head, characterized in that, Comprising: A rotating head (100); An installation shell (200) which can rotate synchronously with the rotating head (100). A placement cavity (201) is formed between the installation shell (200) and the rotating head (100). A spool (300) is movably arranged in the placement cavity (201). A knocking head (301) is fixedly arranged on the spool (300), and the knocking head (301) extends out through the installation shell (200); A knocking and wire releasing assembly which includes a first abutting part (302) and a second abutting part (303). The first abutting part (302) and the second abutting part (303) are respectively arranged at two ends of the spool (300) along the rotation axis direction of the installation shell (200). A first limiting space (102) is arranged on the rotating head (100), and a second limiting space (202) is arranged on the installation shell (200); Wherein, the second abutting part (303) is in abutting connection with the space wall of the second limiting space (202), while the first abutting part (302) is not in contact with the first limiting space (102), and the spool (300) rotates synchronously with the installation shell (200); After the knocking head (301) is knocked and stressed, the second abutting part (303) will disengage from the second limiting space (202), and the first abutting part (302) will extend into the first limiting space (102) as the knocking head (301) moves until it abuts against the space wall of the first limiting space (102), so as to realize wire releasing of the spool (300).

2. The percussion wire-feeding type grass cutting head according to claim 1, wherein When the second abutting part (303) is disengaged from the abutting connection with the space wall of the second limiting space (202), the first abutting part (302) generates an axial displacement and is embedded into the corresponding first limiting space (102). At this time, a movement gap is formed between the radial side wall of the first abutting part (302) and the limiting wall of the first limiting space (102), so that the spool (300) rotates relative to the rotating head (100) to perform a wire releasing operation.

3. The percussion wire-feeding type grass cutter head according to claim 1, characterized in that, The first limiting space (102) includes a plurality of first limiting areas arranged at equal intervals in a ring shape. The second limiting space (202) includes a plurality of second limiting areas arranged at equal intervals in a ring shape.

4. The grass cutting head of the percussion wire feeding type according to claim 3, wherein The first abutting part (302) includes first abutting blocks which are equal in number to and in one-to-one correspondence with the first limiting areas; the second abutting part (303) includes second abutting blocks which are equal in number to and in one-to-one correspondence with the second limiting areas.

5. The percussion wire-feeding type grass cutter head according to claim 1, wherein Abutting elastic parts (101) are arranged between the knocking head (301) and the rotating head (100). When the knocking head (301) generates an axial displacement towards the placement cavity (201) under the action of an external force, the abutting elastic parts (101) undergo compressive deformation to accumulate elastic potential energy; when the external force acting on the knocking head (301) is removed, the abutting elastic parts (101) drive the knocking head (301) to move in the reverse direction to the initial working position through an elastic restoring force.

6. The percussion wire-feeding type grass cutter head according to claim 5, characterized in that A connection card slot (400) is provided on one of the mounting shell (200) and the rotating head (100), and a connection buckle (500) is provided on the other of the two. The connection card slot (400) is snap-fitted and fixed with the connection buckle (500), and at the same time, the two can be separated from each other.

7. The grass cutting head of the tapping wire laying type according to claim 6, characterized in that, One of the rotating head (100) and the mounting shell (200) is provided with a mounting portion (401). An installation cavity (402) is arranged in the mounting portion (401). The abutting elastic member (101) is located in the installation cavity (402). One end of the abutting elastic member (101) abuts against the bottom wall of the installation cavity (402), and the other end of the abutting elastic member (101) abuts against the other of the rotating head (100) and the mounting shell (200).

8. A percussion wire-feeding type grass cutting head according to claim 7, characterized in that, A support column (403) is arranged in the installation cavity (402). The abutting elastic member (101) includes an abutting spring, and the abutting spring is sleeved on the support column (403).

9. A knocking and wire-releasing type grass cutting head according to claim 8, characterized in that, Along the axial direction of the rotating head (100), the abutting spring has a gradient change that the diameter becomes smaller as it gets closer to the bottom wall of the installation cavity (402).

10. A grass trimmer, characterized in that, It includes a percussion wire-releasing type grass cutting head according to any one of claims 1-9.

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