Grass trimmer head

Abstract

The invention belongs to the technical field of agricultural machinery, and particularly relates to a grass trimmer head which comprises a shell and an inner rotating core, the inner rotating core is rotatably arranged in the shell, a rope threading channel and a winding groove are formed in the inner rotating core, the rope threading channel comprises a curved middle section and a linear tail section, two centrosymmetric threading nozzles are arranged on the shell, and the winding groove is formed in the middle section of the middle section of the middle section of the middle section of the middle section of the middle section of the middle section of the middle section of the middle section of the middle section of the middle section. The tail section is inclined to enable the threading nozzle and the threading direction of the tail section to form an included angle with a certain angle, two winding grooves are formed in the circumferential direction of the inner rotating core, the tail section is connected with a guide hole, the guide hole is provided with a guide notch and a guide inclined plane, and the butt joint state of the through hole and the guide hole can be switched. According to the grass trimmer head, the rope threading efficiency is improved, the winding quality is optimized, winding deviation is prevented, and maintenance is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery, and in particular relates to a grass trimmer head. Background Art

[0002] In the fields of agricultural production and garden maintenance, lawn mowers play a vital role. As the core component of a lawn mower, the mower head works by rotating at high speed to efficiently cut and remove weeds in farmland, orchards, lawns and other places, which is directly related to the efficiency and quality of mowing operations.

[0003] At present, the common mower heads on the market are usually equipped with at least two threading holes and follow the single-phase threading principle. In actual operation, the mowing rope is inserted from one end and comes out from the other end after passing through the internal path. One of the threading holes is used to fix one end of the mowing rope, and the other serves to guide or further stabilize the mowing rope, thereby ensuring that the mowing rope does not get entangled, knotted or fall off during high-speed rotation. Therefore, when replacing the mowing rope, the user needs to thread the rope according to a specific path, which is complicated and inefficient. Especially when the mowing rope is long and needs to be replaced frequently, the one-way threading method greatly increases the user's workload.

[0004] On the other hand, for some mower heads that adopt a rope-threading design at both ends, such as the mower head disclosed in the Chinese utility model patent application number 2017217738267, its structure includes a housing and a spool, and the spool is composed of a first part and a second part, which are combined to form multiple threading channels for the mower rope to pass through. Although this type of mower head has some innovations in the threading method, due to its relatively complex structure, it is difficult to ensure that the mower ropes at both ends are evenly stressed during the winding process, which can easily lead to serious deviations in the length of the mower ropes at both ends. This will not only cause the mower rope to generate additional vibration and noise when rotating at high speed, but also have a negative impact on the overall performance of the lawn mower, thereby reducing work efficiency and work quality. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a mower head, which aims to improve the threading efficiency of the mowing rope, optimize the winding quality and prevent winding deviation.

[0006] The objectives of the present invention can be achieved through the following technical solutions: a grass trimmer head, comprising a shell and an inner rotating core, the inner rotating core being rotatably arranged in the shell, a rope threading channel for threading a grass trimming rope is formed on the inner rotating core, a winding groove is provided on the inner rotating core, when the inner rotating core is rotated, the grass trimming rope will be reversely wound in the winding groove, the rope threading channel comprises a curved middle section and a straight tail section connected to both ends of the middle section, two centrally symmetrical threading nozzles are provided on the shell, the threading nozzles have a through hole for the grass trimming rope to pass through and can be connected to the tail section, the tail section is inclined toward the winding side, when the threading nozzle is connected to the tail section, the threading nozzle forms an angle of a certain angle with the threading direction of the tail section.

[0007] Preferably, two adjacent winding grooves are provided on the circumference of the inner rotating core, and each outlet of the two tail sections is connected to a guide hole. The outer circumference of the guide hole and the side wall of the winding groove have a smooth transition. The circumference of the two guide holes are each provided with a guide notch, and are respectively connected with the two winding grooves. The two guide notches are in opposite directions, one clockwise and the other counterclockwise.

[0008] Preferably, the guide hole is provided with an arc-shaped guide slope which is smoothly connected with the tail section, and the guide notch is in a multi-step shape.

[0009] Preferably, it also includes an adjustment mechanism for switching the docking state of the through hole and the guide hole when the inner rotating core is rotated, the adjustment mechanism includes a knob and an elastic member, the knob is at least partially located outside the shell and fixed to the inner rotating core, a plurality of adjustment blocks are provided circumferentially of the inner rotating core, a plurality of adjustment grooves corresponding to the adjustment blocks are provided on the shell, the elastic member is installed in the shell to abut the inner rotating core so that the adjustment block can be inserted into the adjustment groove and locked under the action of elastic force, and rotating the knob can unlock the adjustment block for winding the mowing rope.

[0010] Preferably, a core column is provided on the inner rotating core, and the knob is detachably connected to the core column via a locking screw.

[0011] Preferably, the shell comprises an upper shell and a lower shell, and the upper shell is detachably snap-connected to the lower shell.

[0012] Preferably, a rotating shaft is provided in the lower shell body, a rotating groove is formed on the inner rotating core and is rotatably matched with the rotating shaft, a mounting groove is provided on the rotating shaft, and the elastic member is located in the rotating groove and fixedly mounted in the mounting groove.

[0013] Preferably, a mounting notch corresponding to the threading nozzle is provided on the outer peripheral surface of the lower shell body. The threading nozzle is in a circular ring shape and a ring groove is formed on its outer periphery. The threading nozzle and the mounting notch are rollingly fitted. A pressing end portion is provided on the upper shell body, and the threading nozzle and the pressing end portion are abutted against each other and then clamped on the lower shell body.

[0014] Preferably, a cover plate is provided in the rotating groove, the cover plate is embedded in the bottom of the rotating groove and is buckled with the inner rotating core to form a middle section, and the elastic member abuts against the cover plate.

[0015] Preferably, the angle formed by the threading nozzle and the threading direction of the tail section is 10°-20°.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Improved rope threading efficiency. By designing a rope threading channel with a curved middle section, an inclined tail section and a specific angle, and a centrally symmetrical threading mouth, the grass rope can be threaded in and out more smoothly and quickly, greatly simplifying the threading process and improving the threading efficiency.

[0018] 2. Optimize winding quality. The winding groove and guide hole set on the inner rotating core, as well as the multi-step design of the guide notch, ensure that the mowing rope can fit the inner wall of the winding groove in an orderly and tight manner during the winding process, reduce disorder and crossing, and improve winding quality;

[0019] 3. Prevent winding deviation. The adjustment mechanism can realize precise control and flexible switching of the rotation position of the inner core, and the angle design between the threading nozzle and the tail section can prevent the mowing rope from generating extra vibration and noise during the rotation process, avoid winding deviation, and ensure the length consistency and stability of both ends of the mowing rope.

[0020] 4. The mower head is easy to maintain and replace parts, the mold development cost is low, and it has significant technological progress and practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the structural disassembly of the present invention.

[0024] Figure 4 It is a schematic diagram of the transverse cross-sectional structure of the rope threading channel of the present invention.

[0025] Figure 5 It is a schematic diagram of the inner rotating core structure.

[0026] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure above.

[0027] Figure 7 It is a schematic diagram of the upper shell structure.

[0028] In the figure, 1, shell; 1a, upper shell; 1a1, pressing end; 1b, lower shell; 1b1, rotating shaft; 1b2, mounting groove; 1b3, mounting notch; 11, adjusting groove; 2, inner rotating core; 21, rope threading channel; 21a, middle section; 21b, tail section; 22, winding groove; 23, guide hole; 231, guide notch; 232, guide slope; 24, adjusting block; 25, core column; 26, rotating groove; 3, threading mouth; 4, adjusting mechanism; 41, knob; 42, elastic member; 5, locking screw; 6, cover plate. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] Embodiment 1

[0031] See also Figure 1-Figure 2 as well as Figure 4 , Figure 5 The present embodiment provides a grass trimmer head, including a shell 1 and an inner rotating core 2, the inner rotating core 2 is rotatably arranged in the shell 1, and a rope threading channel 21 for threading a grass trimming rope is formed on the inner rotating core 2, and a winding groove 22 is provided on the inner rotating core 2. When the inner rotating core 2 is rotated, the grass trimming rope will be reversely wound in the winding groove 22, and the rope threading channel 21 includes a curved middle section 21a and a straight tail section 21b connected to both ends of the middle section 21a. Two centrally symmetrical threading nozzles 3 are provided on the shell 1, and the threading nozzle 3 has a through hole for the grass trimming rope to pass through and can be connected to the tail section 21b, and the tail section 21b is inclined toward the winding side. When the threading nozzle 3 is connected to the tail section 21b, the threading direction of the threading nozzle 3 and the tail section 21b forms an angle of a certain angle.

[0032] Installation and use steps of the grass rope:

[0033] Preparation stage: when the mower head is in a non-working state, rotate the inner rotating core 2 so that the tail section 21b on it is aligned with any threading nozzle 3, so that the threading channel 21 and the through hole on the threading nozzle 3 form a connected threading passage;

[0034] Threading starts: one end of the mowing rope is passed through the through hole of the selected threading nozzle 3. Due to the inclined design of the tail section 21b, after ensuring that the insertion end of the mowing rope overlaps with the outlet of the tail section 21b, the mowing rope will smoothly enter the middle section 21a of the rope threading channel 21 along the tail section 21b;

[0035] Passing through the channel: The mowing rope continues to move along the middle section 21a until it reaches the tail section 21b at the other end and passes through the through hole of the other threading nozzle 3 opposite to it. At this time, it is necessary to ensure that the lengths of the mowing ropes passing through the two ends are the same;

[0036] Adjustment and inspection: After confirming that the mowing rope is evenly passed through the two threading nozzles 3, gently tighten the mowing rope to ensure that it is correctly positioned in the rope threading channel 21 and the connection is stable;

[0037] Winding the mowing rope: Start or manually rotate the inner rotating core 2, and the mowing rope will be reversely wound on the winding groove 22 as the inner rotating core 2 rotates, and continue to rotate until the mowing rope reaches the required length, and the winding is completed;

[0038] Installation completed: When the mowing rope is evenly and tightly wound on the winding groove 22, stop rotating the inner rotating core 2, check the fixing of the mowing rope to ensure that it is firmly installed, and prepare to start the mowing operation.

[0039] In this embodiment, the middle section 21a is curved. This structure increases the contact area with the mowing rope. Due to the increase in the contact area, a greater static friction force is generated between the mowing rope and the inner wall of the middle section 21a. This friction force helps to firmly fix the mowing rope in the channel to prevent it from easily slipping out during use. When the mowing rope rotates in the curved channel, its movement will be constrained and limited by the channel wall to prevent the rope from excessively deviating from the center of the rope threading channel 21. The shape of the rope threading channel 21 and the friction force jointly affect the speed and acceleration of the mowing rope, further increasing the stability of its movement. In particular, when the mowing rope is subjected to an external force other than the rope threading force, the friction force can provide the necessary resistance to keep the rope in the channel.

[0040] The tail section 21b is tilted toward the winding side, and the threading nozzle 3 forms a certain angle with the threading direction of the tail section 21b. The angle design will drive the mowing rope to form a bend at the tail section 21b. This bend can not only effectively hinder the external force when winding the mowing rope, but also make the mowing rope fit the winding groove 22 more closely. By making the mowing rope fit the winding groove 22, the winding efficiency and winding quality can be improved. This helps to prevent the mowing rope from getting tangled, pressing the wire, and other problems during the winding process, ensures uniform force, and prevents serious deviations in the length of the mowing rope at both ends.

[0041] Embodiment 2

[0042] See also Figure 2 , Figure 3 , Figure 5 , Figure 6 The inner rotating core 2 is provided with two adjacent winding grooves 22 in the circumferential direction, and each outlet of the two tail sections 21b is connected with a guide hole 23. The outer circumferential surface of the guide hole 23 and the side wall between the winding groove 22 have a smooth transition. The circumferential surface of the two guide holes 23 are respectively provided with a guide notch 231, and are respectively connected with the two winding grooves 22. The two guide notches 231 are in opposite directions, one clockwise and the other counterclockwise.

[0043] When winding the mowing rope: the inner rotating core 2 is rotated, and the mowing ropes at both ends of the rope threading channel 21 will be wound around two different winding grooves 22 in opposite directions respectively as the inner rotating core 2 rotates.

[0044] Based on the first embodiment, this embodiment adopts a specific inner rotating core 2 structure to ensure that the mowing rope can be wound around the inner rotating core 2 in an orderly and tight manner. Two adjacent winding grooves 22 are provided on the circumference of the inner rotating core 2 to accommodate the wound mowing rope to ensure that they do not interfere with each other while maintaining an orderly arrangement.

[0045] A guide hole 23 is connected to the tail section 21b corresponding to each winding groove 22. The guide hole 23 serves as a transition channel before the mowing rope enters the winding groove 22, ensuring that the mowing rope can smoothly enter the winding groove 22. The outer peripheral surface of the guide hole 23 and the side wall between the winding groove 22 are designed to be smooth and non-protruding, which helps to reduce the friction and resistance of the mowing rope during the winding process.

[0046] When winding the mowing rope, both ends thereof enter along the inner wall of the guide hole 23 through the two guide notches 231. Since the two guide notches 231 face opposite directions, one clockwise and the other counterclockwise, both ends of the mowing rope can be guided into two different winding grooves 22, respectively, providing a clear entry path for them.

[0047] With this design, the mowing rope can fit the inner wall of the winding groove 22 more orderly during the winding process, which not only improves the tightness and uniformity of the rope winding, but also reduces the disorder and crossing of the mowing rope during the winding process.

[0048] Furthermore, if Figure 4 , Figure 6 As shown, the guide hole 23 is provided with an arc-shaped guide inclined surface 232 which is smoothly connected with the tail section 21 b, and the guide notch 231 is in a multi-step shape.

[0049] Inside the guide hole 23, an arc-shaped guide slope 232 is provided, which smoothly connects with the tail section 21b to form a natural transition area. The main function of the guide slope 232 is to guide the mowing rope to smoothly and smoothly enter the tail section 21b from the threading nozzle 3. The guide notch 231 is not only directly connected with the winding groove 22, but also presents a multi-step shape, which provides a clearer entry path for the mowing rope, and helps to gradually guide and position the mowing rope before it enters the winding groove, so that the mowing rope can fit the inner wall of the winding groove more accurately.

[0050] See also Figure 2 , Figure 3 , Figure 7In this embodiment, it also includes an adjustment mechanism 4 for switching the docking state between the through hole and the guide hole 23 when the inner rotating core 2 is rotated. The adjustment mechanism 4 includes a knob 41 and an elastic member 42. The knob 41 is at least partially located outside the shell 1 and fixed to the inner rotating core 2. The inner rotating core 2 is provided with a plurality of adjustment blocks 24 in the circumferential direction. The shell 1 is provided with a plurality of adjustment grooves 11 corresponding to the adjustment blocks 24. The elastic member 42 is installed in the shell 1 to abut the inner rotating core 2 so that the adjustment block 24 is inserted into the adjustment groove 11 and locked under the action of elastic force. Rotating the knob 41 can unlock the adjustment block 24 for winding the mowing rope.

[0051] The working principle of the regulating mechanism is as follows:

[0052] Locked state: Under normal use, the elastic force provided by the elastic member 42 allows the adjustment block 24 to be stably inserted into the adjustment slot 11, and the inner rotating core 2 is therefore locked in a specific position. At this time, the docking state between the through hole and the guide hole 23 is fixed, and the winding operation of the mowing rope cannot be performed;

[0053] Unlocking and rotating: When the user needs to wind the mowing rope, he only needs to rotate the knob 41. Since the knob 41 is fixedly connected to the inner rotating core 2, the rotation of the knob 41 will drive the inner rotating core 2 to rotate together. During the rotation process, the adjustment block 24 will gradually disengage from the adjustment slot 11 until it is completely disengaged. At this time, the inner rotating core 2 is in the unlocked state;

[0054] Docking and winding: When switching between the unlocked and locked states, the user can freely rotate the inner core 2 to align the through hole with the guide hole 23, thereby allowing the mowing rope to pass through the through hole and enter the tail section 21b along the guide hole 23 for winding. After winding is completed, the knob 41 is rotated again to reinsert the adjustment block 24 into the other adjustment slot 11, locking the inner core 2 in the desired position.

[0055] The adjusting mechanism 4 realizes the precise control and flexible switching of the rotation position of the inner rotating core 2, thereby improving the convenience and accuracy of winding the mowing rope.

[0056] Furthermore, a stem 25 is provided on the inner rotating core 2 , and the knob 41 is detachably connected to the stem 25 via a locking screw 5 .

[0057] The detachable quick connection design of the core column 25 and the locking screw 5 realizes a firm connection between the knob 41 and the inner rotating core 2. In addition, the user can easily maintain and replace the knob 41 and the inner rotating core 2, thereby extending the service life of the entire mower head.

[0058] Furthermore, the housing 1 comprises an upper housing 1a and a lower housing 1b, and the upper housing 1a and the lower housing 1b are detachably connected by snaps, which facilitates the user to disassemble, maintain and upgrade the grass trimmer head.

[0059] Furthermore, a rotating shaft 1b1 is provided in the lower shell 1b, a rotating groove 26 is opened on the inner rotating core 2 and rotates with the rotating shaft 1b1, a mounting groove 1b2 is provided on the rotating shaft 1b1, and the elastic member 42 is located in the rotating groove 26 and fixed in the mounting groove 1b2.

[0060] Through the close fit between the rotating shaft 1b1 and the rotating groove 26, and the stable installation of the elastic member 42, the stability and smoothness of the inner rotating core 2 during rotation are achieved, the rotation resistance caused by looseness or wear is reduced, and the overall performance of the grass trimmer head is improved.

[0061] Since the structures of the rotating shaft 1b1 and the rotating groove 26 are relatively simple, and the installation and fixing method of the elastic member 42 is convenient, it is more convenient and quicker for users to maintain and replace parts.

[0062] Furthermore, a mounting notch 1b3 corresponding to the threading nozzle 3 is provided on the outer circumferential surface of the lower shell 1b. The threading nozzle 3 is in a circular ring shape and has an annular groove formed on its outer circumference. The threading nozzle 3 is rollingly fitted with the mounting notch 1b3. A pressing end 1a1 is provided on the upper shell 1a. After the threading nozzle 3 abuts against the pressing end 1a1, it is clamped on the lower shell 1b.

[0063] When the threading nozzle 3 cooperates with the mowing rope, it is easy to cause friction and wear with the mowing rope. The installation notch 1b3 not only provides a stable installation position for the threading nozzle 3, but also ensures its stability during the working process. More importantly, it forms a rolling fit with the edge of the installation notch 1b3 of the lower shell 1b. The shape and position of the pressing end 1a1 match the threading nozzle 3, which is used to press and fix the threading nozzle 3 when the upper shell 1a and the lower shell 1b are assembled. When the threading nozzle 3 is placed in the installation notch 1b3 and the upper shell 1a and the lower shell 1b begin to be assembled, the pressing end 1a1 will gradually approach and press the threading nozzle 3. Therefore, the disassembly and assembly of the threading nozzle 3 becomes very simple, reducing the maintenance difficulty and cost of the user.

[0064] Furthermore, a cover plate 6 is provided in the rotating groove 26 . The cover plate 6 is embedded in the bottom of the rotating groove 26 and is buckled with the inner rotating core 2 to form a middle section 21 a . The elastic member 42 abuts against the cover plate 6 .

[0065] The cover plate 6 can be opened conveniently, and the user or maintenance personnel can easily observe the threading and wear degree of the mowing rope in the middle section 21a, so as to carry out maintenance or replacement in time to ensure the normal operation of the mowing head. The curved middle section 21a makes it more difficult to demold the inner rotating core 2 in the mold, which increases the difficulty and cost of mold development to a certain extent. By introducing the design of the middle section 21a formed by the cover plate 6 and the inner rotating core 2 being engaged, since the cover plate 6 can be manufactured and installed separately, there is no need to design a complex demolding structure for the entire inner rotating core 2, thereby greatly reducing the development cost of the mold. The elastic member 42 is abutted against the cover plate 6 to ensure the stability of the engagement of the cover plate 6 with the inner rotating core 2.

[0066] Furthermore, the angle formed by the threading nozzle 3 and the threading direction of the tail section 21b is 10°-20°.

[0067] The setting of this angle range is based on in-depth research and analysis of the threading process and winding stability of the grass cutting rope. If the angle is too large, the tail section 21b may deviate from the docking position with the threading nozzle 3. This will make it difficult for the grass cutting rope to smoothly enter the tail section 21b during the threading process, increase the difficulty of threading, and may even cause the grass cutting rope to jam. It will also make the transition between the threading nozzle 3 and the tail section 21b steeper, further increasing the difficulty of threading the grass cutting rope.

[0068] If the angle is too small, the bend formed by the mowing rope at the tail section 21b will be too small, which will result in the mowing rope being unable to effectively resist the interference of abnormal external forces during the winding process.

[0069] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A grass trimmer head, comprising a housing (1) and an inner rotating core (2), wherein the inner rotating core (2) is rotatably arranged in the housing (1), a rope threading channel (21) for threading a grass trimmer rope is formed on the inner rotating core (2), and a winding groove (22) is provided on the inner rotating core (2), and when the inner rotating core (2) is rotated, the grass trimmer rope will be reversely wound in the winding groove (22), characterized in that: The rope threading channel (21) comprises a curved middle section (21a) and a straight tail section (21b) connected to both ends of the middle section (21a). Two centrally symmetrical threading nozzles (3) are provided on the housing (1). The threading nozzle (3) has a through hole for the mowing rope to pass through and can be connected to the tail section (21b). The tail section (21b) is inclined toward the winding side. When the threading nozzle (3) is connected to the tail section (21b), the threading direction of the threading nozzle (3) and the tail section (21b) forms an angle of a certain angle.

2. A grass trimmer head according to claim 1, characterized in that: The inner rotating core (2) is provided with two adjacent winding grooves (22) in the circumferential direction, and the outlets of the two tail sections (21b) are each connected to a guide hole (23), and the outer circumferential surface of the guide hole (23) and the side wall of the winding groove (22) are smoothly transitioned, and the circumferential surface of the two guide holes (23) are each provided with a guide notch (231), and are respectively connected with the two winding grooves (22), and the two guide notches (231) are oriented in opposite directions, one clockwise and the other counterclockwise.

3. A grass trimmer head according to claim 2, characterized in that: The guide hole (23) is provided with an arc-shaped guide inclined surface (232) which is smoothly connected with the tail section (21b), and the guide notch (231) is in a multi-step shape.

4. A grass trimmer head according to claim 1 or 2, characterized in that: The invention also comprises an adjusting mechanism (4) for switching the docking state between the through hole and the guide hole (23) when the inner rotating core (2) is rotated. The adjusting mechanism (4) comprises a knob (41) and an elastic member (42). The knob (41) is at least partially located outside the shell (1) and fixed to the inner rotating core (2). The inner rotating core (2) is provided with a plurality of adjusting blocks (24) in the circumferential direction. The shell (1) is provided with a plurality of adjusting grooves (11) corresponding to the adjusting blocks (24). The elastic member (42) is installed in the shell (1) and abuts against the inner rotating core (2) so that the adjusting block (24) is inserted into the adjusting groove (11) and locked under the action of elastic force. The adjusting block (24) can be unlocked by rotating the knob (41) for winding the mowing rope.

5. A grass trimmer head according to claim 4, characterized in that: The inner rotating core (2) is provided with a stem (25), and the knob (41) is detachably connected to the stem (25) via a locking screw (5).

6. A grass trimmer head according to claim 4, characterized in that: The housing (1) comprises an upper housing (1a) and a lower housing (1b), and the upper housing (1a) and the lower housing (1b) are detachably connected by snap-fit.

7. A grass trimmer head according to claim 6, characterized in that: A rotating shaft (1b1) is provided in the lower shell (1b), a rotating groove (26) is provided on the inner rotating core (2) and is rotatably matched with the rotating shaft (1b1), a mounting groove (1b2) is provided on the rotating shaft (1b1), and the elastic member (42) is located in the rotating groove (26) and is fixedly mounted in the mounting groove (1b2).

8. A grass trimmer head according to claim 7, characterized in that: The outer circumference of the lower shell (1b) is provided with a mounting notch (1b3) corresponding to the threading nozzle (3); the threading nozzle (3) is in a circular ring shape and has an annular groove formed on its outer circumference; the threading nozzle (3) and the mounting notch (1b3) are rollingly matched; the upper shell (1a) is provided with a pressing end (1a1); the threading nozzle (3) and the pressing end (1a1) are abutted against each other and then snap-fitted onto the lower shell (1b).

9. A grass trimmer head according to claim 8, characterized in that: A cover plate (6) is provided in the rotating groove (26); the cover plate (6) is embedded in the bottom of the rotating groove (26) and is buckled with the inner rotating core (2) to form a middle section (21a); ​​and the elastic member (42) abuts against the cover plate (6).

10. A grass trimmer head according to any one of claims 1 or 2 or 5 or 6, characterized in that: The angle formed by the threading nozzle (3) and the threading direction of the tail section (21b) is 10°-20°.

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