CN212910807U - Grass trimmer - Google Patents
Grass trimmer Download PDFInfo
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- CN212910807U CN212910807U CN202021450136.XU CN202021450136U CN212910807U CN 212910807 U CN212910807 U CN 212910807U CN 202021450136 U CN202021450136 U CN 202021450136U CN 212910807 U CN212910807 U CN 212910807U
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Abstract
The utility model discloses a grass trimmer aims at providing one kind and can effectively solve because of weeds winding, the grass trimmer that leads to the dead problem of output shaft card of grass trimmer. It includes: an operating lever; grass cutting head; the driving part comprises a shell arranged at one end of the operating rod and a speed reducing motor arranged in the shell and used for driving the grass cutting head to rotate, the grass cutting head is positioned below the shell, the lower end of an output shaft of the speed reducing motor penetrates through the shell and is positioned below the shell, and the grass cutting head is fixed at the lower end of the output shaft of the driving motor; the power supply part is arranged at the other end of the operating rod and is used for supplying power to the speed reducing motor; and the output shaft weed winding prevention structure is used for preventing weeds from winding on the output shaft of the grass trimmer in the working process of the grass trimmer to cause the output shaft to be locked and stop rotating.
Description
Technical Field
The utility model relates to a garden instrument, concretely relates to machine of beating grass.
Background
The conventional grass trimmer generally comprises an operating rod, a grass trimming head, a driving part, a power supply part and a handle assembly, wherein the driving part is arranged at one end of the operating rod and is used for driving the grass trimming head to rotate; and the power supply part is arranged at the other end of the operating rod and is used for supplying power to the driving part. Because there is the clearance between the casing of drive unit and the shell of beating the grass head, this makes the machine of beating the grass in the course of the work, on some weeds can twine the output shaft between casing and the shell of beating the grass head, appear beating the grass head load increase, the rotational speed descends, causes the dead stall's of output shaft card even problem. In order to solve the problem, the applicant filed for chinese patent publication No. CN108934473 in 7/10/2018, the utility model provides a grass mower with grass winding prevention and grass cutting head, which cuts off the wound grass through a wound grass cutting device in the application to solve the problem, but the utility model discloses people find in the actual use process that the rotating speed of the grass cutting head of the grass mower is high, the centrifugal force is large, the cut-off knife cannot push the sliding rod inwards after the grass winding under the combined action of the centrifugal force and the sliding rod return spring, and the problem of failure of the wound grass cutting device is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can effectively solve because of the weeds winding, lead to the machine of beating grass's the dead stop rotation's of output shaft card machine of beating grass machine of beating grass machine problem.
The technical scheme of the utility model is that:
a lawnmower comprising: an operating lever; grass cutting head; the driving part comprises a shell arranged at one end of the operating rod and a speed reducing motor arranged in the shell and used for driving the grass cutting head to rotate, the grass cutting head is positioned below the shell, the lower end of an output shaft of the speed reducing motor penetrates through the shell and is positioned below the shell, and the grass cutting head is fixed at the lower end of the output shaft of the driving motor; the power supply part is arranged at the other end of the operating rod and is used for supplying power to the speed reducing motor; and the output shaft weed winding prevention structure is used for preventing weeds from winding on the output shaft of the grass trimmer in the working process of the grass trimmer to cause the output shaft to be locked and stop rotating.
The output shaft prevents weeds winding arrangement includes: the shell accommodating groove is formed in the bottom surface of the shell, a notch of the shell accommodating groove faces downwards, an output shaft through hole is formed in the top wall of the shell accommodating groove, and the lower end of the output shaft sequentially penetrates through the output shaft through hole and the shell accommodating groove; the cutting edge accommodating groove is formed in the outer side face of the output shaft between the machine shell and the grass mowing head, is strip-shaped, and is parallel to the axial direction of the output shaft in the length direction;
the blade mounting assembly comprises an annular upper mounting flat plate and an annular lower mounting flat plate which are arranged on the output shaft, the annular upper mounting flat plate and the annular lower mounting flat plate are both positioned in the casing accommodating groove, the annular upper mounting flat plate is close to the top wall of the casing accommodating groove, the lower surface of the annular lower mounting flat plate is flush with the bottom surface of the casing or close to the bottom surface of the casing, and the annular lower mounting flat plate is provided with a strip-shaped cutting blade passing opening; the first end of the cutting blade is rotatably arranged on the lower surface of the annular upper mounting flat plate through a shaft rod, the first end of the cutting blade is close to the output shaft, and the shaft rod is perpendicular to the output shaft; the pre-tightening spring provides elastic force and is used for driving the cutting blade to rotate downwards around the shaft rod and penetrate through the cutting blade through opening so as to enable the cutting edge of the cutting blade to enter the cutting edge accommodating groove; in the working process of the grass trimmer, when the rotating speed of the grass trimming head is greater than the set rotating speed n1, the cutter blade rotates downwards around the shaft rod under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; when the rotation speed of the grass mowing head is less than the set rotation speed n2, the cutter blade rotates downwards around the shaft under the action of the pre-tightening spring and penetrates through the opening of the cutter blade, so that the cutting edge of the cutter blade enters the blade edge accommodating groove, and the set rotation speed n1 is greater than the set rotation speed n 2.
Therefore, after the grass mower is started, when the output shaft drives the grass mowing head to work at a normal rotating speed, the cutter blade rotates upwards around the shaft rod under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; in the grass mower working process, if weeds wind on the output shaft between the casing and the housing of the grass mower, the grass mower load is increased, the rotating speed is reduced, when the rotating speed of the grass mower is reduced to a set rotating speed n2, the cutter blade rotates downwards around the shaft rod under the action of the pre-tightening spring, and the cutting edge of the cutter blade enters the cutting edge accommodating groove, so that the weeds wound on the output shaft are cut off through the cutter blade, the weeds are thrown out after being cut off, the output shaft drives the grass mower to recover to normal rotating speed, and the problem that the output shaft of the grass mower is blocked to stop rotating due to the winding of the weeds is effectively solved.
As the preferred, the upper end of cutting edge holding tank up extends to in the casing holding tank, the cutting blade is crossed mouthful and is linked together with the cutting edge holding tank, the upper end of cutting blade's cutting edge is located the casing holding tank. So, can cut off the back with the winding on being close to the dull and stereotyped weeds of installation under the annular, guarantee that the output shaft can drive the rotation speed work that the head of beating the grass resumes fast normally.
Preferably, the lower end of the output shaft is provided with a connecting screw rod, the connecting screw rod is coaxial with the output shaft, the outer diameter of the connecting screw rod is smaller than that of the output shaft, a bolt connecting hole is formed in the middle of the top surface of the housing of the grass cutting head, the connecting screw rod is in threaded connection with the bolt connecting hole, and the lower end surface of the output shaft abuts against the top surface of the housing of the grass cutting head.
As preferred, the lower extreme of cutting edge holding tank is linked together with the lower terminal surface of output shaft, the top surface of the shell of the head of beating grass is equipped with the opening groove of dodging up, the lower extreme of cutting edge holding tank with dodge the groove and communicate mutually, after the cutting edge of cutting blade got into the cutting edge holding tank, the cutting edge of cutting blade passed cutting edge holding tank lower extreme. Thus, the weeds wound on the output shaft close to the grass cutting head can be cut off.
Preferably, the blade edge of the second end of the cutting blade is provided with an impact block, and after the blade edge of the cutting blade enters the blade edge accommodating groove, the impact block abuts against the side wall of the avoiding groove. Therefore, the collision between the cutting edge of the cutting blade and the output shaft can be avoided.
Preferably, the lower surface of the annular upper mounting plate is provided with an elastic block, and when the cutter blade rotates upwards around the shaft under the action of centrifugal force and is completely accommodated in the housing accommodating groove, the cutter blade abuts against the elastic block. Therefore, the cutter blade can be buffered through the elastic block, and the cutter blade is prevented from rigidly impacting the annular upper mounting plate.
Preferably, the pre-tensioning spring is a torsion spring or a coil spring.
Preferably, the power supply part comprises a shell arranged at the other end of the operating rod and a battery arranged in the shell, and the battery provides power for the speed reducing motor; the handle assembly comprises a main handle and an auxiliary handle, the main handle is formed by a part of the shell, the auxiliary handle is arranged on the operating rod, the auxiliary handle comprises a sliding seat sleeve, a holding handle and a seat pipe clamp, the sliding seat sleeve is sleeved on the operating rod in a sliding mode, the holding handle is arranged on the sliding seat sleeve, the seat pipe clamp is connected with the sliding seat sleeve, and the seat pipe clamp is used for locking and fixing the sliding seat sleeve on the operating rod. So, the operator can loosen the seat pipe clamp according to self needs when using, removes the auxiliary handle to the suitable position on the action bars, then locks the seat pipe clamp to fixed auxiliary handle, thereby realizes adjusting the position of auxiliary handle according to operator's self needs, so that the operator uses the grass cutter.
Preferably, the operating rod is formed of a hollow tube. On one hand, the hollow pipe is light in weight, so that an operator can conveniently use the grass trimmer; on the other hand, the wire between the battery and the reduction motor may be arranged inside the hollow tube.
Preferably, the operating rod is a telescopic rod. Therefore, the length of the operating rod can be adjusted according to actual needs.
Preferably, the operating rod is a metal rod.
The utility model has the advantages that: after the grass trimmer is started, when the output shaft drives the grass trimming head to work at a normal rotating speed, the cutter blade rotates upwards around the shaft rod under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; in the grass mower working process, if weeds wind on the output shaft between the casing and the housing of the grass mower, the grass mower load is increased, the rotating speed is reduced, when the rotating speed of the grass mower is reduced to a set rotating speed n2, the cutter blade rotates downwards around the shaft rod under the action of the pre-tightening spring, and the cutting edge of the cutter blade enters the cutting edge accommodating groove, so that the weeds wound on the output shaft are cut off through the cutter blade, the weeds are thrown out after being cut off, the output shaft drives the grass mower to recover to normal rotating speed, and the problem that the output shaft of the grass mower is blocked to stop rotating due to the winding of the weeds is effectively solved.
Drawings
Fig. 1 is a schematic structural view of the grass trimmer of the present invention.
FIG. 2 is a schematic structural view of the driving part, the grass-mowing head and the output shaft weed-winding-preventing structure of the grass-mowing machine of the present invention.
Fig. 3 is an enlarged view of a part a of fig. 2, in which the rotation speed of the grass-mowing head of the grass-mowing machine is less than the set rotation speed n 2.
Fig. 4 is a schematic structural diagram of the output shaft weed-winding preventing structure when the rotation speed of the grass-mowing head of the grass mowing machine of the utility model is greater than the set rotation speed n 1.
In the figure:
the device comprises a driving part 1, a machine shell 1.0, an output shaft 1.1 and a connecting screw rod 1.2;
2, a grass cutting head;
the weed winding preventing structure comprises an output shaft weed winding preventing structure 3, a flat plate 3.01 is arranged on an annular upper portion, a flat plate 3.02 is arranged on an annular lower portion, a machine shell accommodating groove 3.1, a cutter blade 3.2, a shaft rod 3.3, a pre-tightening spring 3.4, a cutter edge accommodating groove 3.5, a cutter blade through opening 3.6, an elastic block 3.7, a cutter edge 3.8 and an avoiding groove 3.9;
an operating lever 4;
a power supply part 5, a housing 5.1;
a main handle 6;
an auxiliary handle 7, a sliding seat sleeve 7.1, a holding handle 7.2 and a seat pipe clamp 7.3.
Detailed Description
To make the objects, technical solutions and advantages of embodiments of the present invention clearer, the embodiments of the present invention are clearly explained and illustrated below with reference to the accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present solution, and are not construed as limiting the present solution.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited thereby. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "a plurality" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The first embodiment is as follows: as shown in fig. 1, 2 and 3, the grass trimmer comprises an operating rod 4, a grass trimmer head 2, a driving part 1, a power supply part 5 and an output shaft weed winding preventing structure 3. The driving part 1 comprises a machine shell 1.0 arranged at one end of the operating rod and a speed reducing motor arranged in the machine shell and used for driving the grass cutting head to rotate. The grass cutting head is positioned below the machine shell. The lower end of the output shaft 1.1 of the speed reducing motor penetrates through the machine shell and is positioned below the machine shell. The grass cutting head is fixed at the lower end of an output shaft of the driving motor. And the power supply part 5 is arranged at the other end of the operating rod and is used for supplying power to the speed reducing motor. In this embodiment, the power supply member includes a case 5.1 provided at the other end of the operating lever and a battery provided in the case. The battery provides the power for gear motor, specifically, is connected through the wire electricity between battery and the gear motor.
The output shaft weed winding prevention structure 3 is used for preventing weeds from winding on an output shaft of the grass trimmer in the working process of the grass trimmer to cause the output shaft to be locked and stop rotating. The grass trimmer output shaft weed-winding-prevention structure comprises a machine shell accommodating groove 3.1, a cutting edge accommodating groove 3.5, a blade mounting assembly, a cutting blade 3.2 and a pre-tightening spring 3.4. The casing holding tank 3.1 sets up on the bottom surface of casing, and the notch of casing holding tank sets up down, and the notch orientation of casing holding tank is the head of beating the grass promptly. The roof of casing holding tank is equipped with the output shaft via hole, and output shaft 1.1 passes output shaft via hole and casing holding tank in proper order.
The cutting edge holding groove 3.5 is arranged on the outer side surface of the output shaft between the machine shell and the grass cutting head. The cutting edge holding tank is the bar, and the length direction of cutting edge holding tank is parallel with the axial of output shaft.
The blade mounting assembly includes an annular upper mounting plate 3.01 and an annular lower mounting plate 3.02 disposed on the output shaft. The annular upper mounting plate and the annular lower mounting plate are both located in the casing accommodating groove, the annular upper mounting plate is close to the top wall of the casing accommodating groove, and the annular lower mounting plate is flush with the bottom surface of the casing or close to the bottom surface of the casing. The annular lower mounting flat plate is provided with a strip-shaped cutter blade passing opening 3.6, and in the embodiment, the length direction of the cutter blade passing opening extends along the radial direction of the output shaft.
The first end of cutter piece 3.2 rotates through axostylus axostyle 3.3 and sets up on the annular lower surface of installing the flat board, and in this embodiment, the first end of cutter piece is the upper end of cutter piece promptly. The cutting blade is positioned below the annular upper mounting flat plate. The first end of the cutter blade is close to the output shaft. The shaft lever is vertical to the output shaft. In this embodiment, the cutting blade is in a strip shape. The cutter blade is parallel to the output shaft.
The pre-tightening spring 3.4 provides elastic force for driving the cutter blade to rotate downwards around the shaft rod and penetrate through the cutter blade through opening, so that the cutting edge 3.8 of the cutter blade enters the cutting edge accommodating groove. The pre-tightening spring is a torsion spring or a coil spring, in the embodiment, the pre-tightening spring is a torsion spring, the torsion spring is sleeved on the shaft rod, one end of the torsion spring abuts against the lower surface of the annular upper mounting plate, and the other end of the torsion spring abuts against the convex block on the side face of the cutting blade.
As shown in FIG. 4, when the rotation speed of the grass cutting head is greater than the set rotation speed n1 (in this embodiment, the set rotation speed n1 is 1/5 of the rated rotation speed of the grass cutting machine) during the operation of the grass cutting machine, the cutter blade rotates upward around the shaft under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; as shown in fig. 3, when the rotation speed of the grass cutting head is less than the set rotation speed n2 (in this embodiment, the set rotation speed n1 is 1/10 of the rated rotation speed of the grass cutting machine) during the operation of the grass cutting machine, the cutting blade rotates downward around the shaft under the action of the pre-tightening spring, and the cutting edge of the cutting blade enters the blade-accommodating groove. The set rotation speed n1 is greater than the set rotation speed n 2.
Therefore, after the grass mower is started, when the output shaft drives the grass mowing head to work at a normal rotating speed, the cutter blade rotates upwards around the shaft rod under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; in the grass mower working process, if weeds wind on the output shaft between the casing and the housing of the grass mower, the grass mower load is increased, the rotating speed is reduced, when the rotating speed of the grass mower is reduced to a set rotating speed n2, the cutter blade rotates downwards around the shaft rod under the action of the pre-tightening spring, and the cutting edge of the cutter blade enters the cutting edge accommodating groove, so that the weeds wound on the output shaft are cut off through the cutter blade, the weeds are thrown out after being cut off, the output shaft drives the grass mower to recover to normal rotating speed, and the problem that the output shaft of the grass mower is blocked to stop rotating due to the winding of the weeds is effectively solved.
Further, as shown in fig. 1, the lawnmower further comprises a handle assembly. The handle assembly includes a main handle 6 formed by a portion of the housing and an auxiliary handle 7 provided on the operating lever. The auxiliary handle comprises a sliding seat sleeve 7.1 which is sleeved on the operating rod in a sliding way, a holding handle 7.2 which is arranged on the sliding seat sleeve and a seat pipe clamp 7.3 which is connected with the sliding seat sleeve. The seat pipe clamp is used for locking and fixing the sliding seat sleeve on the operating rod. So, the operator can loosen the seat pipe clamp according to self needs when using, removes the auxiliary handle to the suitable position on the action bars, then locks the seat pipe clamp to fixed auxiliary handle, thereby realizes adjusting the position of auxiliary handle according to operator's self needs, so that the operator uses the grass cutter.
Further, the operating rod is composed of a hollow pipe. On one hand, the hollow pipe is light in weight, so that an operator can conveniently use the grass trimmer; on the other hand, the wire between the battery and the reduction motor may be arranged inside the hollow tube.
Further, the action bars is the telescopic link, so, can adjust the length of action bars according to actual need. The operating rod is a metal rod, and in the embodiment, the operating rod is made of an aluminum pipe.
Further, as shown in fig. 3, the annular upper mounting plate is parallel to the annular lower mounting plate, and the annular upper mounting plate is perpendicular to the output shaft. The casing holding tank is the circular slot, and casing holding tank and output shaft are coaxial, the annular is installed flat board down and is coaxial with the output shaft. The gap between the annular lower mounting flat plate and the inner wall of the machine shell accommodating groove is 1-2 mm.
In this embodiment, the annular upper mounting plate and the output shaft are of an integrally formed structure or are connected by welding, or the annular lower mounting plate and the output shaft are of an integrally formed structure or are connected by welding.
Further, as shown in fig. 3 and 4, the upper end of the cutting edge accommodating groove 3.5 extends upwards into the casing accommodating groove, the through opening of the cutting blade is communicated with the cutting edge accommodating groove, and the upper end of the cutting edge 3.8 of the cutting blade is located in the casing accommodating groove. So, can cut off the back with the winding on being close to the dull and stereotyped weeds of installation under the annular, guarantee that the output shaft can drive the rotation speed work that the head of beating the grass resumes fast normally.
Further, as shown in fig. 3, a connecting screw rod 1.2 is arranged at the lower end of the output shaft, the connecting screw rod is coaxial with the output shaft, and the outer diameter of the connecting screw rod is smaller than that of the output shaft. The middle part of the top surface of the shell of the grass cutting head is provided with a bolt connecting hole. The connecting screw rod is connected with the bolt connecting hole through threads. The lower end surface of the output shaft is abutted against the top surface of the shell of the grass mowing head.
As shown in fig. 3 and 4, the lower end of the blade receiving groove 3.5 communicates with the lower end surface of the output shaft. The top surface of the shell of the grass cutting head is provided with an avoidance groove 3.9 with an upward opening. The lower extreme of cutting edge holding tank communicates with dodging the groove. After the cutting edge of the cutting blade enters the cutting edge accommodating groove, the cutting edge of the cutting blade penetrates through the lower end of the cutting edge accommodating groove. Thus, the weeds wound on the output shaft close to the grass cutting head can be cut off.
Further, be equipped with the striking piece on the cutting edge of cutting blade's second end, after the cutting edge of cutting blade got into the cutting edge holding tank, the striking piece supported on the lateral wall of dodging the groove. Therefore, the collision between the cutting edge of the cutting blade and the output shaft can be avoided.
Further, as shown in fig. 3 and 4, the lower surface of the annular upper mounting plate is provided with an elastic block 3.7, and when the cutter blade rotates upward around the shaft under the action of centrifugal force and is completely accommodated in the housing accommodating groove, the cutter blade abuts against the elastic block. Therefore, the cutter blade can be buffered through the elastic block, and the cutter blade is prevented from rigidly impacting the annular upper mounting plate. The elastic block is a rubber block.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.
Claims (10)
1. A grass trimmer is characterized by comprising:
an operating lever;
grass cutting head;
the driving part comprises a shell arranged at one end of the operating rod and a speed reducing motor arranged in the shell and used for driving the grass cutting head to rotate, the grass cutting head is positioned below the shell, the lower end of an output shaft of the speed reducing motor penetrates through the shell and is positioned below the shell, and the grass cutting head is fixed at the lower end of the output shaft of the driving motor;
the power supply part is arranged at the other end of the operating rod and is used for supplying power to the speed reducing motor; and
the output shaft weed winding prevention structure is used for preventing weeds from winding on an output shaft of the grass trimmer in the working process of the grass trimmer to cause the output shaft to be locked and stop rotating.
2. A lawnmower according to claim 1, wherein the output shaft weed-entanglement preventing structure comprises:
the shell accommodating groove is formed in the bottom surface of the shell, a notch of the shell accommodating groove faces downwards, an output shaft through hole is formed in the top wall of the shell accommodating groove, and the lower end of the output shaft sequentially penetrates through the output shaft through hole and the shell accommodating groove;
the cutting edge accommodating groove is formed in the outer side face of the output shaft between the machine shell and the grass mowing head, is strip-shaped, and is parallel to the axial direction of the output shaft in the length direction;
the blade mounting assembly comprises an annular upper mounting flat plate and an annular lower mounting flat plate which are arranged on the output shaft, the annular upper mounting flat plate and the annular lower mounting flat plate are both positioned in the casing accommodating groove, the annular upper mounting flat plate is close to the top wall of the casing accommodating groove, the lower surface of the annular lower mounting flat plate is flush with the bottom surface of the casing or close to the bottom surface of the casing, and the annular lower mounting flat plate is provided with a strip-shaped cutting blade passing opening;
the first end of the cutting blade is rotatably arranged on the lower surface of the annular upper mounting flat plate through a shaft rod, the first end of the cutting blade is close to the output shaft, and the shaft rod is perpendicular to the output shaft; and
the pre-tightening spring provides elastic force and is used for driving the cutting blade to rotate downwards around the shaft rod and penetrate through the cutting blade through opening so as to enable the cutting edge of the cutting blade to enter the cutting edge accommodating groove;
in the working process of the grass trimmer, when the rotating speed of the grass trimming head is greater than the set rotating speed n1, the cutter blade rotates downwards around the shaft rod under the action of centrifugal force, and the cutter blade is completely accommodated in the housing accommodating groove; when the rotation speed of the grass mowing head is less than the set rotation speed n2, the cutter blade rotates downwards around the shaft under the action of the pre-tightening spring and penetrates through the opening of the cutter blade, so that the cutting edge of the cutter blade enters the blade edge accommodating groove, and the set rotation speed n1 is greater than the set rotation speed n 2.
3. A lawnmower according to claim 2, wherein the upper end of the blade receiving channel extends upwardly into the housing receiving channel, the blade aperture communicating with the blade receiving channel, the upper end of the blade being located in the housing receiving channel.
4. A lawnmower according to claim 2, wherein the lower end of the output shaft is provided with a connecting screw, the connecting screw is coaxial with the output shaft, the connecting screw has an outer diameter smaller than that of the output shaft, a bolt-engaging hole is provided in the middle of the top surface of the housing of the grass cutting head, the connecting screw is threadedly engaged with the bolt-engaging hole, and the lower end surface of the output shaft abuts against the top surface of the housing of the grass cutting head.
5. The grass trimmer as claimed in claim 4, wherein the lower end of the blade holding groove is communicated with the lower end surface of the output shaft, the top surface of the housing of the grass trimmer head is provided with an avoiding groove with an upward opening, the lower end of the blade holding groove is communicated with the avoiding groove, and the blade of the cutter blade passes through the lower end of the blade holding groove after the blade of the cutter blade enters the blade holding groove.
6. A lawnmower according to claim 5, wherein the second end of the cutting blade has a striking block on the cutting edge, the striking block bearing against the side wall of the relief groove when the cutting edge of the cutting blade enters the blade-receiving groove.
7. A lawnmower according to claim 2, wherein the lower surface of the annular upper mounting plate is provided with a resilient block against which the cutter blade will bear when the cutter blade is rotated upwardly about the shaft by centrifugal force and is fully received in the housing receiving channel.
8. A lawnmower according to claim 1, further comprising a handle assembly, wherein the power supply comprises a housing disposed at the other end of the operating lever and a battery disposed in the housing, the battery providing power to the speed reduction motor;
the handle assembly comprises a main handle and an auxiliary handle, the main handle is formed by a part of the shell, the auxiliary handle is arranged on the operating rod, the auxiliary handle comprises a sliding seat sleeve, a holding handle and a seat pipe clamp, the sliding seat sleeve is sleeved on the operating rod in a sliding mode, the holding handle is arranged on the sliding seat sleeve, the seat pipe clamp is connected with the sliding seat sleeve, and the seat pipe clamp is used for locking and fixing the sliding seat sleeve on the operating rod.
9. A lawnmower according to claim 1, wherein the operating lever comprises a hollow tube.
10. A lawnmower according to claim 1, wherein the operating lever is a metal lever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021450136.XU CN212910807U (en) | 2020-07-21 | 2020-07-21 | Grass trimmer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021450136.XU CN212910807U (en) | 2020-07-21 | 2020-07-21 | Grass trimmer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212910807U true CN212910807U (en) | 2021-04-09 |
Family
ID=75331896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021450136.XU Active CN212910807U (en) | 2020-07-21 | 2020-07-21 | Grass trimmer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212910807U (en) |
-
2020
- 2020-07-21 CN CN202021450136.XU patent/CN212910807U/en active Active
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