Trimmer head with automatic line release

Abstract

A trimmer head with automatic line release, comprising a housing (1), wherein the housing (1) is provided with an opening, one side of the housing (1) is provided with a line output hole (2), and the inside of the housing (1) is provided with a shaft tube (3), the shaft tube (3) being connected to an output end of an electric motor. A line release assembly (4) is provided inside the housing (1), the line release assembly (4) being sleeved on the shaft tube (3) and used for winding a line and releasing the line through the line output hole (2), and the line release assembly (4) being provided with a buffering return toothed ring (44) and a limiting engagement toothed ring (43). A frame body assembly (5) is provided inside the housing (1), the frame body assembly (5) being located below the line release assembly (4). A sliding limiting assembly (6) is provided on the frame body assembly (5), the sliding limiting assembly (6) comprising a sliding block (61) and a column, wherein the sliding block (61) is limited and slidably arranged inside the frame body assembly (5); the end of the sliding block (61) that is close to the line output hole (2) is reduced in weight relative to the other end, thus forming a weight-reduced end, and the other end is a counterweight end; the sliding block (61) is slidably sleeved on the shaft tube (3); and the column is used for buffering line release when the line release assembly (4) rotates, and for making the sliding block (61) return and limiting rotation of the line release assembly (4) for line release.

Description

Automatic line-releasing grass trimming head Technical Field

[0001] The invention relates to the technical field of garden tools, in particular to an automatic line-laying grass trimmer head. Background Art

[0002] The trimmer head is the rotating mechanism of the lawn mower, which is used to clear weeds. In order to facilitate the mowing process, the trimmer head usually uses a rope. Currently, the rope trimmer heads of lawn mowers on the market only have two line-releasing methods: knock-type line-releasing and slider-driven line-releasing.

[0003] To this end, Chinese patent CN112088645A discloses a grass trimming head that can be driven to rotate around a rotation axis to achieve grass trimming; it includes: a spool for winding a grass trimming rope; a head shell, which is formed with a accommodating space, and the spool is at least partially accommodated in the accommodating space; a transmission member, which is installed to the spool, and the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a mating part for cooperating with the driving part; the mating part is formed with a mating surface for contacting the driving part to apply a reaction force to the driving part, and the mating surface extends in a first plane, the first plane is basically parallel to the rotation axis, and the distance between the rotation axis and the first plane is greater than 0, etc.

[0004] However, there are problems with the wire-paying methods of existing devices. The knocking-type wire-paying can pay out a lot of wire at once, but the wire-paying length cannot be controlled. Each time the wire-paying is knocked out, too long wire will be paid out, resulting in a lot of wire waste. The slider-driven wire-paying can only pay out a very short length of wire each time. To pay out a wire of sufficient length, multiple repeated operations are required, and each time the machine is started, the wire will be stretched, resulting in wire waste.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art that the knocking-type pay-off can pay out a lot of line at once but cannot control the pay-off length. Each time the line is knocked, too long a line will be paid out, resulting in a lot of line waste. The slider-driven pay-off can only pay out a very short line length each time. To pay out a sufficient length of line, multiple repeated operations are required, and each time the machine is started, the line will be stretched, resulting in line waste. An automatic pay-off grass trimmer head is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An automatic line-releasing grass trimmer head comprises: a shell having an opening, a line outlet hole being provided on one side of the shell, a shaft tube being provided inside the shell, and the shaft tube being connected to an output end of a motor;

[0009] A wire-releasing assembly is provided inside the housing, the wire-releasing assembly is sleeved on the shaft tube, and is used for winding the wire and releasing the wire from the wire outlet hole. The wire-releasing assembly is provided with a buffer return tooth and a limit clamping tooth;

[0010] A frame assembly is provided inside the shell, and the frame assembly is located below the line-paying assembly. A sliding limit assembly is provided on the frame assembly, and the sliding limit assembly includes a slider and a column. The slider limit sliding is set inside the frame assembly, and one end of the slider close to the wire outlet hole is weight-reduced relative to the other end to form a weight-reducing end, and the other end is a gravity end. A sliding opening is provided in the middle of the slider, and the slider is slidably sleeved on the shaft tube. The column is used to buffer the line-paying when the line-paying assembly rotates and to return the slider and limit the rotation of the line-paying assembly to pay out the line. The slider sleeved on the shaft tube is used to control the buffering return and limiting effects.

[0011] Preferably, the shell is symmetrically provided with slots on both sides, the edges of the slots are provided with slots for wrapping the cover clips, the shell opening is provided with a cover, and the two ends of the cover are symmetrically fixedly connected with clips, the clips are clamped inside the slots to fix the cover to the shell, and a supporting ring and a limiting ring are provided in the center of the cover disc to support the line-paying assembly so that excessive displacement inside the mowing head affects the smoothness of line-paying, and it is also convenient for the user to place the line-paying assembly on the cover and clamp it into the shell for installation. The edge of the cover disc is provided with a clamping arc to enhance the ability of the cover to withstand torque during the rotation of the mowing head when the cover is covered on the shell.

[0012] Preferably, a plurality of fan blades are fixedly connected in an annular shape to the bottom of the shell, and the plurality of fan blades are arc-shaped blade strips and are fixedly connected in an annular shape to the bottom end of the shell.

[0013] Preferably, the pay-off assembly includes an inner spool, a limit plate, a limit gear ring and a buffer return gear ring, the two limit plates are fixedly connected to the two ends of the inner spool, the inner spool and the limit plates are both sleeved on the shaft tube, the limit gear ring is fixedly connected to the middle of the lower limit plate, the buffer return gear ring is fixedly connected to the edge of the lower limit plate, and the limit gear ring and the buffer return gear ring are concentrically arranged.

[0014] Preferably, the teeth of the limit gear ring are polygonal teeth, and the teeth of the buffer return gear ring are arc-shaped teeth, and both are arranged inside the ring. The spacing between the buffer return column and the limit column is consistent with the spacing between the limit gear ring and the buffer return gear ring. The buffer return column is located inside the limit gear ring, and the limit column is located between the limit gear ring and the buffer return gear ring.

[0015] Preferably, the frame assembly includes a slide and a limit bar, the two slides are symmetrically arranged with the shaft tube as the center, the limit bars are symmetrically fixedly connected to both sides of the slider, and the limit sliding is arranged on the two slides.

[0016] Preferably, the columns in the sliding limit assembly are respectively a buffer return column and a limit column. The buffer return column is fixedly connected to the position of the buffer return tooth of the slider corresponding to the line-paying assembly, and is used to slow down the rotation of the line-paying assembly and return the limit column. The limit column is fixedly connected to the position of the limit tooth of the slider corresponding to the line-paying assembly, and is used to limit the rotation of the line-paying assembly.

[0017] Preferably, the buffer return column is a cylinder, which is used to contact the buffer return gear ring, and the limiting column is a polygonal column, which is used to contact the limiting tooth ring, so as to help the line-releasing assembly rotate to release the line and increase the contact area with the tooth to increase the limiting effect.

[0018] Preferably, a rebound component is provided between the inner wall of the housing and the gravity end of the slider, and the rebound component is used to limit the sliding position of the slider and help the slider to reset.

[0019] Preferably, a rebound component is provided between the inner wall of the shell and the gravity end of the slider, and the rebound component is used to limit the sliding position of the slider and help the slider to reset. The rebound component includes a first magnetic block and a second magnetic block. The first magnetic block is fixedly connected to the side of the gravity end of the slider, and the second magnetic block is fixedly connected to the inner side of the shell and is arranged opposite to the first magnetic block. The magnetic poles of the first magnetic block and the second magnetic block facing each other are the same, generating a repulsive force, driving the gravity end of the slider away from the inner wall of the shell.

[0020] Preferably, the slider is exposed on the surface of the shell and is provided as a pushable button. The user can manually pull and release the line after pressing the button. There is an annular protrusion on the shell at the exposed position of the slider, which fits with the exposed part of the slider to form an annular protrusion on the shell, which is used to facilitate the user to manually release the line while reducing the wind resistance of the grass trimming head caused by the slider button protrusion during the rotation process.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention uses the centrifugal force changes in the internal components of the mower head caused by the length of the cord to control the length of the line. This allows the user to start the machine and use it directly without having to worry about whether to extend the exposed cord.

[0023] 2. Since the pay-off is automatically controlled according to the length of the rope, the rope waste is greatly reduced, saving social materials and user energy, making the use of the mower more environmentally friendly;

[0024] 3. It is difficult to control the line length by simply using centrifugal force in a high-speed trimmer head. The device is designed with a buffer return gear ring to gradually weaken the line-releasing force each time the inner spool rotates during the rotation of the trimmer head.

[0025] 4. The use of a slider sleeved on the shaft tube to control the buffer return and limit effects is to maximize the stability of the automatic pay-off mechanism and extend its service life.

[0026] 5. The buffer return column is circular in order to ensure contact and buffering, and the limit column is a polygonal column in order to contact with the limit tooth ring (43) over a larger area, which helps the pay-off assembly to rotate and pay-off and increases the contact area with the tooth to increase the limiting effect, thereby ensuring the effect of limiting and buffering return;

[0027] 6. The metal ring of the cable outlet on the housing is opposite to the weight end of the shaft tube and the slider. This is to balance the weight on the left and right ends of the trimmer head shaft tube, so that the trimmer head will not shake too much during rotation.

[0028] 7. The slider is exposed on the surface of the shell to provide a push button. After pressing the button, the user can manually pull and release the line. There is an annular protrusion on the shell at the exposed position of the slider, which fits with the exposed part of the slider to form an annular protrusion on the shell. This is to facilitate the user to manually release the line while reducing the wind resistance caused by the slider button protrusion during the rotation of the grass trimmer head.

[0029] 8. The outer shell is equipped with reinforcing ribs connecting the frame assembly and the outer shell edge to enhance the mower head's ability to withstand the motor speed;

[0030] 9. The surface of the cover is a smooth arc surface, which reduces the friction loss between the ground and the mowing head when the mowing head touches the ground due to user error. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a front structural diagram of an automatic line-laying mowing head proposed by the present invention;

[0032] FIG2 is a schematic diagram of the bottom structure of an automatic line-laying mowing head proposed by the present invention;

[0033] FIG3 is a schematic diagram of the front structure of the interior of the housing of an automatic line-releasing mowing head proposed by the present invention;

[0034] FIG4 is a schematic diagram of the internal side structure of the housing of an automatic line-releasing mowing head proposed by the present invention;

[0035] FIG5 is a schematic diagram of the cover structure of an automatic line-laying mowing head proposed by the present invention;

[0036] FIG6 is a schematic structural diagram of a sliding limit assembly of an automatic line-laying mowing head proposed by the present invention;

[0037] FIG7 is a schematic diagram of the front structure of a line-paying assembly of an automatic line-paying mower head proposed by the present invention;

[0038] FIG8 is a schematic diagram of the bottom structure of a line-releasing component of an automatic line-releasing grass trimmer head proposed by the present invention.

[0039] In the figure: 1 outer shell, 2 wire outlet hole, 3 axis tube, 4 wire pay-off assembly, 41 inner spool, 42 limit plate, 43 limit tooth, 44 buffer return gear ring, 5 frame assembly, 51 slide, 52 limit bar, 6 sliding limit assembly, 61 slider, 62 buffer return column, 63 limit column, 7 rebound assembly, 71 first magnetic block, 72 second magnetic block, 8 sliding mouth, 9 cover, 10 clamp, 11 fan blade. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] The terms "upper", "lower", "left", "right", "middle" and "one" used in the present invention are only for the convenience of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the present invention without substantially changing the technical content.

[0042] 1 to 8 , an automatic line-laying mower head includes: a housing 1 having an opening, a wire outlet hole 2 being provided on one side of the housing 1, a shaft tube 3 being provided inside the housing 1, and the shaft tube 3 being connected to the output end of the motor;

[0043] A wire-paying assembly 4 is provided inside the housing 1. The wire-paying assembly 4 is sleeved on the shaft tube 3 and is used for winding the wire and paying the wire out of the wire outlet hole 2. The wire-paying assembly 4 is provided with a buffer return tooth 44 and a limit clamping tooth 43. The buffer return tooth ring 44 has a plurality of buffer return teeth, and the limit clamping tooth ring 43 has a plurality of limit clamping teeth.

[0044] The support 61 of the present invention is provided with a plurality of support members 61, 62 and 64, and the support members 61 are provided with a plurality of support members 62. The support members 61 are provided with a plurality of support members 61, 62 and 64, and the support members 61 are provided with a plurality of support members 61.

[0045] The metal ring of the outlet hole on the housing 1 is opposite to the gravity end of the shaft tube 3 and the slider 61, which is used to balance the gravity of the left and right ends of the grass trimming head shaft tube 3 so that the grass trimming head will not have excessive shaking tendency during rotation;

[0046] In the embodiment of the above technical solution, when the motor drives the mowing head to rotate, when the exposed rope of the mowing head is not long enough or breaks and shortens during the mowing process, due to the difference in weight at both ends of the slider 61, the slider 61 moves toward the gravity end under the action of centrifugal force, and during the movement, the limit column 63 is changed from a stuck state with the line-releasing component 4 to a state where the limit column 63 is separated from the line-releasing component 4, so that the line-releasing component 1 can start to rotate and release the line due to the tension generated by the exposed rope during the swinging process and the elastic component. As the line is released, the longer the exposed rope is, the greater the pressure on the motor will be during the actual mowing process, causing the speed of the motor output end to slow down. When the motor rotation speed slows down, the centrifugal force applied to the slider 61 gradually The gradual change is small. When the line rope is put into the appropriate length and a certain tension is generated, the slider 61 is insufficient in centrifugal force. When the line rope is put into the appropriate length and a certain tension is generated, the line-releasing component 4 is driven by the repulsive force of the rebound component 7 and the tension of the line rope to rotate the buffer return tooth 44 to push the slider buffer return column 62, and rebounds to its original position. The limit column 63 clamps the line-releasing component 4 and no longer rotates to release the line. The present invention uses the centrifugal force change of the internal components of the grass trimmer head caused by the length of the line rope to control the length of the line-releasing, so that the user does not need to perform too much operation, and can start the machine and use it directly without considering whether the exposed line rope should be extended. The waste of the line rope is also greatly reduced, saving social materials and user energy, making the use of the grass trimmer more environmentally friendly.

[0047] When the exposed cord is at the appropriate length, the centrifugal force generated by the motor driving the trimmer head is less than the repulsive force between the rebound assembly 7, and the limit post 63 remains locked with the pay-off assembly 4, preventing excess cord from being released, thereby avoiding cord waste. Furthermore, each time the machine is started, if the exposed cord is not long enough, the trimmer head will pay out the coil to the appropriate length.

[0048] The preferred technical solution in this embodiment is that the shell 1 is symmetrically provided with card slots on both sides, and the edge of the card slot is provided with a slot for wrapping the cover card. The shell 1 is provided with a cover 9 at the opening, and the two ends of the cover 9 are symmetrically fixedly connected with card members 10. The card members 10 are clamped inside the card slot to fix the cover 9 to the shell 1. The center of the cover 9 disc is provided with a support ring and a limit ring of the line-paying component 4, which are used to hold up the line-paying component 4 to avoid excessive displacement inside the grass trimming head affecting the smoothness of the line-paying. It is also convenient for the user to place the line-paying component 4 on the cover 9 and clamp it into the shell 1 for installation. The edge of the cover 9 disc is provided with a card arc, and the surface of the cover 9 is a smooth arc surface, which reduces the friction loss of the ground to the grass trimming head when the grass trimming head is touched to the ground due to misoperation by the user;

[0049] The bottom of the housing 1 is annularly fixedly connected with a plurality of fan blades 11. The plurality of fan blades 11 are arc-shaped blades and are annularly fixedly connected to the bottom end of the housing 1. The fan blades are close to one end of the connection between the grass trimming head shaft tube and the motor output end, and are not connected to the shaft tube 3 motor connection, so that the airflow is smoother and grass clippings are better prevented from entering the connection between the grass trimming head shaft tube and the motor output end;

[0050] The line-releasing assembly 4 includes an inner spool 41, a limit plate 42, a limit clamping gear ring 43 and a buffer return gear ring 44. The two limit plates 42 are fixedly connected to the two ends of the inner spool 41. The inner spool 41 and the limit plate 42 are both sleeved on the shaft tube 3. The limit clamping gear ring 43 is fixedly connected to the middle of the lower limit plate 42, and the buffer return gear ring 44 is fixedly connected to the edge of the lower limit plate 42. The limit clamping gear ring 43 and the buffer return gear ring 44 are concentrically arranged. The outward pulling force generated by the rope during the swinging process is used to rotate the inner spool 41 inside the grass trimming head to release the line. It is difficult to control the length of the rope release by simply using centrifugal force in a high-speed grass trimming head. The device is designed with a buffer return gear ring 44 so that the power of the inner spool 41 rotating to release the line is gradually weakened each time the grass trimming head rotates during the rotation of the grass trimming head. Multiple limit clamping gear rings 43 correspond to multiple buffer return gear rings 44 respectively. Whenever the grass trimming head rotates and the exposed length of the grass trimming head is not long enough, the slider 61 slides toward the gravity end due to the centrifugal force greater than the rebound component, and the limiting post 63 on the slider 61 clamps the limiting clamping tooth ring 43 to make the state of the spool not rotating turn into the state where the limiting post 63 and the limiting clamping tooth ring 43 are disengaged. At this time, the inner spool 41 can be pulled and rotated by the centrifugal force of the exposed rope of the grass trimming head. At the same time, the buffer return post 62 on the slider 61 abuts against the tooth groove of the buffer return tooth ring 44. In the process of the inner spool 41 being pulled and rotated by the rope, the buffer return tooth ring 44 abuts against the inner spool 41. The buffer return teeth engage one of the buffer return teeth, causing the limit post 63 to return to a state where it is locked with the limit clamping tooth ring 43. At this time, the first automatic line pay-off is completed. If the line rope exposed outside the grass trimming head is not long enough, the slider 61 slides due to the centrifugal force being greater than the repulsive force of the rebound component 7, and returns to the state where the limit post 63 is disengaged from the limit clamping tooth ring 43. The buffer return post 62 again reaches the bottom of the buffer return tooth ring 44, and a new round of line pay-off begins. This cycle continues until the length of the line rope exposed outside the grass trimming head is long enough, the centrifugal force of the slider 61 is less than the repulsive force on the rebound component 7, and the grass trimming head will no longer pay-off.

[0051] The teeth of the limiting tooth ring 43 are polygonal teeth, and the teeth of the buffer return tooth ring 44 are arc-shaped teeth, and both are arranged inside the ring. The spacing between the buffer return post 62 and the limiting post 63 is consistent with the spacing between the limiting tooth ring 43 and the buffer return tooth ring 44. The limiting post 63 is located inside the limiting tooth ring 43, and the buffer return post 62 is located between the limiting tooth ring 43 and the buffer return tooth ring 44.

[0052] The frame assembly 5 includes a slide 51 and a limit bar 52. The two slides 51 are symmetrically arranged with the shaft tube 3 as the center. The limit bars 52 are symmetrically fixedly connected to both sides of the slider 61, and the limit sliding is set on the two slides 51. The position of the slider 61 is limited by the slide 51 and the limit bar 52 to ensure directional sliding. The housing 1 is provided with a reinforcing rib connecting the frame assembly 5 and the housing 1 to enhance the mower head's ability to withstand the motor speed.

[0053] Automatic line pay-off can be achieved without the rebound component 7. The rebound component is added to this embodiment mainly to make the line pay-off mechanism more stable and convenient for the user to manually reel in and pay out the line. The rebound component can be composed of a spring, or two repulsive magnets, reeds and other components that can achieve rebound. Here is an example of a rebound component composed of repulsive magnets, including a first magnetic block 71 and a second magnetic block 72. The first magnetic block 71 is fixedly connected to the side of the gravity end of the slider 61, and the second magnetic block 72 is fixedly connected to the inner side of the shell 1 and is arranged opposite to the first magnetic block 71. The magnetic poles of the first magnetic block 71 and the second magnetic block 72 facing each other are the same, generating a repulsive force, driving the gravity end of the slider 61 away from the inner wall of the shell 1, and rebounding by generating a certain repulsive force through the first magnetic block 71 and the second magnetic block 72. At the same time, the rebound component 7 can also be set to an elastic structure such as a spring, so as to generate a force that can resist the centrifugal force;

[0054] The columns in the sliding limit assembly 6 are respectively a buffer return column 62 and a limit column 63. The buffer return column 62 is fixedly connected to the position of the buffer return tooth 44 of the slider 61 corresponding to the pay-off assembly 4, and is used to slow down the rotation of the pay-off assembly 4 and return the limit column. The limit column 63 is fixedly connected to the position of the limit tooth of the slider 61 corresponding to the pay-off assembly, and is used to limit the rotation of the pay-off assembly 4.

[0055] The buffer return post 62 is a cylinder for contacting the buffer return gear ring 44, and the limiting post 63 is a triangular post for contacting the limiting snap ring 43. The buffer return post 61 is circular to ensure contact and buffering, and the limiting post 63 is a polygonal post to ensure the position of the limiting snap ring 43.

[0056] A rebound component 7 is provided between the inner wall of the shell 1 and the gravity end of the slider 61. The rebound component 7 is used to limit the sliding position of the slider 61 and help the slider to reset. The first magnetic block 71 is fixedly connected to the side of the gravity end of the slider 61, and the second magnetic block 72 is fixedly connected to the inner side of the shell 1 and is arranged opposite to the first magnetic block 71. The magnetic poles of the first magnetic block 71 and the second magnetic block 72 facing each other are the same, generating a repulsive force, driving the gravity end of the slider 61 away from the inner wall of the shell 1.

[0057] The slider 61 is exposed on the surface of the shell 1 and is set as a push button. After the user presses the button, he can manually pull the line and release the line. There is an annular protrusion on the shell 1 at the exposed position of the slider 61, which fits with the exposed part of the slider to form an annular protrusion on the shell. It is used to facilitate the user to manually release the line while reducing the wind resistance of the grass trimming head caused by the slider button protrusion during the rotation process.

[0058] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic line-laying mowing head, comprising: The housing is characterized in that the housing has an opening, a wire outlet hole is provided on one side of the housing, a shaft tube is provided inside the housing, and the shaft tube is connected to the output end of the motor; A wire-releasing assembly is arranged inside the housing, and the wire-releasing assembly is sleeved on the shaft tube and used for winding the wire and releasing the wire from the wire outlet hole. The wire-releasing assembly is provided with a buffer return tooth and a limit clamping tooth; A frame assembly is provided inside the shell, the frame assembly is located below the wire-releasing assembly, a sliding limit assembly is provided on the frame assembly, the sliding limit assembly includes a slider and a column, the slider is slidingly provided inside the frame assembly, one end of the slider close to the wire outlet hole is weight-reduced relative to the other end to form a weight-reducing end, and the other end is a gravity end, a sliding opening is provided in the middle of the slider, the slider is slidingly sleeved on the shaft tube, the column is used to buffer the wire-releasing assembly when the wire-releasing assembly rotates, and to return the slider and limit the wire-releasing assembly from rotating to release the wire, and the slider sleeved on the shaft tube is used to control the buffering return and limiting effects; 2. The automatic line-laying mowing head according to claim 1, characterized in that: The shell is symmetrically provided with slots on both sides, the edges of the slots are provided with slots for wrapping the cover clips, the shell opening is provided with a cover, the two ends of the cover are symmetrically fixedly connected with clips, the clips are clamped in the slots to fix the cover to the shell, a supporting ring and a limiting ring are provided in the center of the cover disc to support the line-releasing assembly to prevent excessive displacement inside the mowing head and affect the smoothness of the line-releasing, and a clamping arc is provided on the edge of the cover disc to enhance the ability of the cover to withstand torque during the rotation of the mowing head when the cover is covered on the shell.

3. The automatic line-laying mowing head according to claim 1, characterized in that: The bottom of the shell is annularly fixedly connected with a plurality of fan blades, and the plurality of fan blades are arc-shaped blade strips and are annularly fixedly connected to the bottom end of the shell.

4. The automatic line-laying mowing head according to claim 1, characterized in that: The pay-off assembly includes an inner spool, a limit plate, a limit gear ring and a buffer return gear ring. The two limit plates are fixedly connected to the two ends of the inner spool. The inner spool and the limit plates are both sleeved on the shaft tube. The limit gear ring is fixedly connected to the middle of the lower limit plate. The buffer return gear ring is fixedly connected to the edge of the lower limit plate. The limit gear ring and the buffer return gear ring are concentrically arranged.

5. The automatic line-laying mowing head according to claim 4, characterized in that: The tooth plates of the limit gear ring are polygonal teeth, and the tooth plates of the buffer return gear ring are arc-shaped teeth, and both are arranged inside the ring. The spacing between the buffer return column and the limit column is consistent with the spacing between the limit gear ring and the buffer return gear ring. The buffer return column is located inside the limit gear ring, and the limit column is located between the limit gear ring and the buffer return gear ring.

6. The automatic line-laying mowing head according to claim 1, characterized in that: The frame assembly comprises a slide and a limit bar, the two slides are symmetrically arranged with the shaft tube as the center, the limit bars are symmetrically fixedly connected to both sides of the slide block, and the limit sliding is arranged on the two slides.

7. The automatic line-releasing mowing head according to claim 1, characterized in that: The columns in the sliding limit assembly are respectively a buffer return column and a limit column. The buffer return column is fixedly connected to the position of the buffer return tooth of the wire-releasing assembly corresponding to the slider, and is used to slow down the rotation of the wire-releasing assembly and return the limit column. The limit column is fixedly connected to the position of the limit tooth of the wire-releasing assembly corresponding to the slider, and is used to limit the rotation of the wire-releasing assembly.

8. The automatic line-releasing mowing head according to claim 7, characterized in that: The buffer return column is a cylinder, which is used to contact the buffer return gear ring. The limiting column is a polygonal column, which is used to contact the limiting clamping tooth ring, so as to help the line-releasing assembly rotate to release the line and increase the contact area with the clamping tooth to increase the limiting effect.

9. The automatic line-releasing mowing head according to claim 1, characterized in that: A rebound component is arranged between the inner wall of the housing and the gravity end of the slider, and the rebound component is used to limit the sliding position of the slider and help the slider to reset.

10. The automatic line-releasing mowing head according to claim 9, characterized in that: The rebound assembly includes a first magnetic block and a second magnetic block. The first magnetic block is fixedly connected to the side of the gravity end of the slider, and the second magnetic block is fixedly connected to the inner side of the shell and is arranged opposite to the first magnetic block. The magnetic poles of the first magnetic block and the second magnetic block facing each other are the same, generating a repulsive force to drive the gravity end of the slider away from the inner wall of the shell.

11. The automatic line-releasing mowing head according to claim 1, characterized in that: The slider is exposed on the surface of the shell and is configured as a push button. After the user presses the button, the line can be manually pulled and released. There is an annular protrusion on the shell at the exposed position of the slider, which fits with the exposed part of the slider to form an annular protrusion on the shell.

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