CN220044197U - Detection device and grass mowing machine - Google Patents

Abstract

The utility model relates to the technical field of grass mowers, in particular to a detection device and a grass mowing machine, wherein the detection device comprises a shell, a rotating shaft, a swing arm, a sensor and a limiting mechanism; the shell is provided with an accommodating cavity; the rotating shaft is rotatably arranged on the shell and comprises a first end extending into the accommodating cavity and a second end extending out of the shell; the swing arm is connected with the second end and is used for driving the rotating shaft to rotate when being impacted by the grass mowing rope; the sensor is arranged in the accommodating cavity and is used for detecting the rotation angle of the rotating shaft; the limiting mechanism is arranged in the accommodating cavity and is used for limiting the angle of the rotating shaft to a first angle so as to enable the swing arm to be spaced from the rotating path of the grass mowing rope. According to the embodiment of the utility model, the swing arm is impacted by the grass mowing rope to drive the rotating shaft to rotate, the length of the grass mowing rope is detected by detecting the rotation of the rotating shaft, the length detection efficiency of the grass mowing rope can be improved, and the sensor is arranged in the accommodating cavity, so that the problem that grass scraps influence the detection effect can be solved.

Description

Detection device and grass mowing machine

Technical Field

The utility model relates to the technical field of grass mowers, in particular to a detection device and a grass mowing machine.

Background

Grass cutters are becoming increasingly popular with many users as a garden tool for grass disposal. The grass trimmer typically trims grass by driving the grass trimmer rope in rotation, the grass trimmer rope being disposed within the working head and extending a free end that performs rotary cutting in response to high speed rotation of the grass trimmer head. Because the grass mowing rope rotates to mow grass, the tail end of the grass mowing rope is easy to abrade, the abraded grass mowing rope cannot reach the required grass mowing radius, and the grass mowing efficiency is greatly reduced. Therefore, the grass trimmer is provided with a paying-off mechanism to adjust the length of the grass trimming rope extending out of the grass trimming head at a proper time.

The grass cutting machine in the prior art judges whether rope is needed to be paid off or not by depending on the visual grass cutting condition of an operator, and then the rope is paid off by manual operation, so that the efficiency of the mode is low and the user experience is poor; and a large amount of grass scraps can be attached to the surface of the grass trimmer after grass trimming, and the grass scraps can seriously influence the detection effect for the optical detection means.

Disclosure of Invention

The embodiment of the utility model aims to provide a detection device and a grass trimmer, which can at least solve the problems that the length detection efficiency of a grass cutting rope is low and the detection effect is influenced by grass scraps.

In order to solve the technical problems, one technical scheme adopted by the embodiment of the utility model is as follows: the detection device comprises a shell, a rotating shaft, a swing arm, a sensor and a limiting mechanism; the shell is provided with an accommodating cavity; the rotating shaft is rotatably arranged on the shell and comprises a first end extending into the accommodating cavity and a second end extending out of the shell; the swing arm is connected with the second end and is used for driving the rotating shaft to rotate when being impacted by the grass mowing rope; the sensor is arranged in the accommodating cavity and is used for detecting the rotation angle of the rotating shaft; the limiting mechanism is arranged in the accommodating cavity and is used for limiting the rotation angle of the rotating shaft to be a first angle so that the swing arm is spaced from the rotation path of the grass mowing rope.

In some embodiments, the detection device further includes a limiting member disposed at the first end of the rotating shaft, the limiting member being provided with a first limiting surface; the limiting mechanism comprises a push block, the push block is arranged in the accommodating cavity in a sliding mode, the push block comprises a second limiting surface, the push block is used for applying acting force to the limiting piece, the limiting piece rotates under the acting force until the first limiting surface abuts against the second limiting surface, and the rotating shaft is driven to rotate to the first angle.

In some embodiments, the limiting mechanism includes a linear driver disposed in the accommodating cavity, and the push block is disposed on a driving shaft of the linear driver, and is configured to move toward or away from the limiting member under the driving of the driving shaft.

In some embodiments, the position of the push block sliding within the receiving cavity includes a stop position, the push block being spaced from the stop and interfering with the rotational path of the stop when the push block is in the stop position.

In some embodiments, the detection device further comprises a trigger member disposed at the first end of the rotating shaft, the trigger member being configured to squeeze the sensor and trigger the sensor when the rotating shaft rotates to a second angle.

In some embodiments, the sensor includes a trigger arm for triggering upon contact with the trigger member.

In some embodiments, the swing arm is provided with a magnetic member; the sensor comprises a magnetic field sensor for triggering when the magnetic member passes.

In some embodiments, the detection device further comprises a seal bearing, the seal bearing is disposed in the housing, and the rotating shaft is disposed in the seal bearing in a penetrating manner.

In order to solve the technical problems, another technical scheme adopted by the embodiment of the utility model is as follows: there is provided a grass trimmer comprising a detection device as claimed in any one of the preceding claims.

In some embodiments, the grass trimmer further comprises a cutting member for cutting the grass cutting rope.

Different from the situation of the related art, the detection device and the grass mowing machine provided by the embodiment of the utility model have the advantages that the swing arm can be impacted by the grass mowing rope to drive the rotating shaft to rotate, the sensor can judge whether the grass mowing rope impacts the swing arm according to the rotating angle of the rotating shaft so as to realize the detection of the length of the grass mowing rope, the automatic detection of the length of the grass mowing rope can be realized, and the detection efficiency of the length of the grass mowing rope is improved; the sensor is arranged in the accommodating cavity, so that grass scraps are not easy to attach, and the problem that the grass scraps influence the detection effect can be solved; besides, the limiting mechanism is further arranged, the angle of the rotating shaft can be limited to be a first angle, and at the moment, the swing arm is spaced from the rotating path of the grass beating rope, so that the problem that the grass beating rope touches the detecting device during working can be solved, and the normal working of the grass beating rope is facilitated.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.

FIG. 1 is a schematic diagram of a detection device according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a detection device according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram illustrating a state of the detecting device according to the embodiment of the present utility model when the rotation angle of the rotating shaft is a first angle;

FIG. 4 is a schematic diagram of a detecting device according to an embodiment of the present utility model in a state where a swing arm naturally sags;

fig. 5 is a schematic diagram of a state of the detecting device according to the embodiment of the utility model when the rotation angle of the rotating shaft is a second angle;

FIG. 6 is a schematic structural diagram of a detecting device according to another embodiment of the present utility model;

fig. 7 is a schematic structural view of a grass trimmer according to an embodiment of the present utility model.

Reference numerals in the specific embodiments are as follows:

100. a detection device; 1. a housing; 11. a receiving chamber; 12. a mounting hole; 13. a first shell; 14. a second case; 2. sealing the bearing; 3. a rotating shaft; 31. a first end; 32. a second end; 4. swing arms; 41. a magnetic member; 5. a limiting piece; 51. a first limiting surface; 6. a limiting mechanism; 61. a pushing block; 611. the second limiting surface; 62. a linear driver; 7. a trigger; 8. a sensor; 81. a trigger arm; 200. grass trimmer, 201, mounting bracket; 202. a grass mowing device; 203. and (5) cutting the piece.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, the terms "first", "second", etc. are used to define the components, which are only for convenience in distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore, should not be construed as limiting the scope of the present utility model. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless otherwise specifically defined.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the utility model described below can be combined with one another as long as they do not conflict with one another.

In order to solve the above technical problems, as shown in fig. 1 and 2, an embodiment of the present utility model provides a detection device 100, which is applied to a grass mower, wherein the detection device 100 includes a housing 1, a sealing bearing 2, a rotating shaft 3, a swing arm 4, a limiting member 5, a limiting mechanism 6, a triggering member 7 and a sensor 8. The shell 1 is used for installing a sealing bearing 2, a rotating shaft 3, a swing arm 4, a limiting piece 5, a limiting mechanism 6, a triggering piece 7 and a sensor 8. The sealed bearing 2 is used for installing the rotating shaft 3. The rotating shaft 3 is used for connecting the swing arm 4, the limiting piece 5 and the triggering piece 7. The swing arm 4 is used for being impacted by the grass rope to drive the rotation shaft 3 to rotate. The limiting mechanism 6 is used for being matched with the limiting piece 5 to limit the rotation angle of the rotating shaft 3. The sensor 8 is used for being matched with the trigger piece 7 to detect the rotation angle of the rotating shaft 3. According to the embodiment of the utility model, the swing arm 4 is impacted by the grass mowing rope to drive the rotating shaft 3 to rotate, and then the sensor 8 is used for detecting the rotating angle of the rotating shaft 3 to judge whether the grass mowing rope impacts the swing arm 4, so that the automatic detection of the length of the grass mowing rope is realized, and the detection efficiency of the length of the grass mowing rope can be improved.

For the above-described housing 1, as shown in fig. 1 and 2, the housing 1 may be mounted to a grass cutter. The housing 1 is provided with a receiving cavity 11, the receiving cavity 11 is used for installing the limiting piece 5, the limiting mechanism 6, the triggering piece 7 and the sensor 8, so that pollution of external pollutants, such as grass clippings, to the limiting piece 5, the limiting mechanism 6, the triggering piece 7 and the sensor 8 is improved, and the limiting mechanism 6 and the sensor 8 can work normally. For example, when grass clippings adhere to the sensor 8, the detection effect of the sensor 8 is affected, and particularly, for the optical detection means, the adhesion of grass clippings to the sensor 8 causes the sensor 8 to fail to work normally, and this problem can be ameliorated by disposing the sensor 8 in the accommodation chamber 11. Through setting up accommodation chamber 11 can also reduce in steam gets into stop gear 6 and sensor 8, reduce stop gear 6 and sensor 8's damage. Optionally, the accommodating cavity 11 is a sealed cavity, so that the detection device 100 has better waterproof and dustproof properties, and the detection device 100 can be washed by water, thereby being convenient for cleaning the grass trimmer.

In some embodiments, as shown in fig. 2, the housing 1 is provided with a mounting hole 12, the mounting hole 12 is connected with the accommodating cavity 11, the sealed bearing 2 is disposed in the mounting hole 12, that is, the sealed bearing 2 is disposed in the housing 1, and the rotating shaft 3 is disposed in the sealed bearing 2 in a penetrating manner, so that the rotating shaft 3 is rotatably disposed in the housing 1. And the sealing bearing 2 is beneficial to improving the sealing effect of the accommodating cavity 11. Alternatively, the sealed bearing 2 is a waterproof bearing.

In some embodiments, as shown in fig. 2, the housing 1 includes a first shell 13 and a second shell 14, where the first shell 13 is detachably connected to the second shell 14 and encloses a containing cavity 11 therebetween, and the detachable connection of the first shell 13 and the second shell 14 facilitates the installation of the limiting member 5, the limiting mechanism 6, the triggering member 7, and the sensor 8 in the containing cavity 11.

As shown in fig. 1 and 2, the rotating shaft 3 includes a first end 31 extending into the accommodating cavity 11 and a second end 32 extending out of the housing 1. Alternatively, the shaft 3 is cylindrical.

For the swing arm 4, as shown in fig. 1 and 2, the swing arm 4 is connected to the second end 32, and the swing arm 4 is used for driving the rotating shaft 3 to rotate when being impacted by the grass rope. The swing arm 4 can rotate relative to the shell 1 along with the rotating shaft 3, wherein the swing arm 4 can rotate to the rotating path of the grass mowing rope, so that the grass mowing rope can be impacted; the swing arm 4 can also rotate to be spaced from the rotating path of the grass mowing rope, so that the swing arm is not contacted with the grass mowing rope when the grass mowing rope works, and the normal work of the grass mowing rope is facilitated.

In this embodiment, the detecting device 100 is located above the straw rope, and the swing arm 4 is perpendicular to the rotating shaft 3. As shown in fig. 4, when the swing arm 4 naturally sags, the swing arm 4 faces downwards, at this time, the swing arm 4 is located on the rotation path of the grass rope, if the length of the grass rope meets the grass cutting radius, the swing arm 4 can be impacted when the grass rope rotates, so that the rotating shaft 3 rotates, if the length of the grass rope is shorter than the grass cutting radius, the swing arm 4 cannot be impacted when the grass rope rotates, and whether the length of the grass rope meets the requirement can be judged through the principle. When the swing arm 4 rotates upwards to a specific angle, the swing arm 4 can be spaced from the rotation path of the grass mowing rope, for example, as shown in fig. 3, when the rotation angle of the rotating shaft 3 is limited to be a first angle, the swing arm 4 inclines towards one side, and the swing arm 4 is spaced from the rotation path of the grass mowing rope, so that the grass mowing rope cannot touch the swing arm 4 at the moment, and normal work of the grass mowing rope cannot be affected.

As shown in fig. 2, the stopper 5 is disposed at the first end 31 of the rotating shaft 3, and the stopper 5 is provided with a first stopper surface 51. The first limiting surface 51 is used for contacting with the limiting mechanism 6, and faces towards the limiting mechanism 6 when contacting with the limiting mechanism 6, so that the rotation angle of the limiting piece 5 can be limited, and the rotation angle of the rotating shaft 3 is limited. Optionally, the limiting member 5 is detachably connected to the rotating shaft 3.

For the above-mentioned stop mechanism 6, as shown in fig. 2, the stop mechanism 6 is disposed in the accommodating cavity 11, and the stop mechanism 6 is used for limiting the rotation angle of the rotating shaft 3 to a first angle, so that the swing arm 4 is spaced from the rotation path of the straw rope. Specifically, the limiting mechanism 6 includes a push block 61, where the push block 61 is slidably disposed in the accommodating cavity 11, the push block 61 includes a second limiting surface 611, the push block 61 is configured to apply an acting force to the limiting member 5, and the limiting member 5 rotates under the acting force until the first limiting surface 51 abuts against the second limiting surface 611, so as to drive the rotating shaft 3 to rotate to a first angle.

In this embodiment, as shown in fig. 2 and 4, when the swing arm 4 naturally sags, the first limiting surface 51 faces the push block 61, and an acute angle is formed between the second limiting surface 611 and the first limiting surface 51, so when the push block 61 contacts with the limiting member 5, the edge of the second limiting surface 611 contacts with the edge of the first limiting surface 51, and the push block 61 continues to move to push the first limiting surface 51 to rotate toward the second limiting surface 611 until the first limiting surface 51 is attached to the second limiting surface 611, as shown in fig. 3, at this time, the limiting member 5 cannot rotate, and the rotation angle of the rotating shaft 3 is the first angle, so that the rotation angle of the rotating shaft 3 is limited to the first angle.

In some embodiments, as shown in fig. 2, the limiting mechanism 6 includes a linear driver 62, the linear driver 62 is disposed in the accommodating cavity 11, the push block 61 is disposed on a driving shaft of the linear driver 62, and the push block 61 is used to move close to or away from the limiting member 5 under the driving of the driving shaft. The linear driver 62 is connected with the housing 1, and a driving shaft of the linear driver 62 faces the stopper 5, so that the push block 61 is slidably disposed in the accommodating chamber 11, and the push block 61 can be moved toward or away from the stopper 5 by the driving of the driving shaft. Alternatively, the linear actuator 62 is detachably connected to the housing 1. Optionally, the linear driver 62 is an electromagnetic push rod, and when the electromagnetic push rod is not electrified, the rotation angle of the rotating shaft 3 is limited to be a first angle through the push block 61 and the limiting piece 5, so that the rotation paths of the swing arm 4 and the grass beating rope are always in an interval state; when the electromagnetic push rod is electrified, the electromagnetic push rod is retracted to release the limiting piece 5, so that the swing arm 4 naturally sags to be impacted by the grass mowing rope.

In some embodiments, as shown in fig. 5, the position in which the push block 61 slides within the receiving chamber 11 includes a stop position, and when the push block 61 is in the stop position, the push block 61 is spaced from the stopper 5 and interferes with the rotational path of the stopper 5. When the push block 61 is set at the stop position, the stopper 5 cannot rotate 360 degrees, but can rotate a certain angle; and the shaft 3 can be rotated to the second angle under the restriction of the push block 61, and when the shaft 3 is rotated to the second angle, the sensor 8 is triggered, so that the restriction of the rotation angle of the shaft 3 by the push block 61 does not interfere with the detection of the sensor 8. Through limiting the free 360 degrees rotations of locating part 5, can improve swing arm 4 by the problem of the rope striking back incessant rotation of beating grass, be favorable to stop gear 6 to limit the angle of pivot 3 to first angle to can make swing arm 4 stop rotating immediately and detect next time. When the linear driver 62 is an electromagnetic push rod, the electromagnetic push rod is electrified and retracted to enable the push block 61 to be located at the stop position, so that the limit of the push block 61 on the rotation angle of the rotating shaft 3 is realized.

As shown in fig. 2 and 7, the triggering element 7 is disposed at the first end 31 of the rotating shaft 3, and the triggering element 7 is used for pressing the sensor 8 when the rotating shaft 3 rotates to the second angle and triggering the sensor 8. The trigger piece 7 rotates synchronously with the rotation, and when the rotating shaft 3 rotates to a second angle, the trigger piece 7 contacts with the sensor 8 and presses the sensor 8, and the sensor 8 is triggered under the pressing of the trigger piece 7. Optionally, the trigger piece 7 is detachably disposed on the rotating shaft 3.

As shown in fig. 2, the sensor 8 is disposed in the accommodating chamber 11, and the sensor 8 is configured to detect a rotation angle of the rotating shaft 3. Specifically, as shown in fig. 2, the sensor 8 includes a trigger arm 81, and the trigger arm 81 is configured to trigger when in contact with the trigger piece 7. When the trigger 7 contacts the trigger arm 81, it can be judged that the rotation shaft 3 is rotated to the second angle, and the swing arm 4 is hit by the grass rope, so that the length of the grass rope satisfies the requirement. Alternatively, the sensor 8 is a micro-motion sensor.

In other embodiments, a marker (not shown) may be provided on the shaft 3, and the sensor 8 may be capable of detecting a displacement change of the marker and calculating the rotation angle of the shaft 3 based on the displacement change.

In other embodiments, as shown in fig. 6, the swing arm 4 is provided with a magnetic member 41; the sensor 8 comprises a magnetic field sensor 8, the magnetic field sensor 8 being arranged to trigger when the magnetic member 41 passes. When the rotating shaft 3 rotates to the second angle, the swing arm 4 passes through the magnetic field sensor 8, and at this time, the magnetic piece 41 passes through the magnetic field sensor 8, and the magnetic field sensor 8 triggers, so that the rotating angle of the rotating shaft 3 can be detected. Alternatively, the magnetic field sensor 8 is a hall sensor.

In other embodiments, the limiting mechanism 6 may include a stepper motor (not shown) for driving the rotation shaft 3 to rotate, and may rotate the rotation shaft 3 to the first angle, so as to limit the rotation angle of the rotation shaft 3 to the first angle.

The embodiment of the utility model also provides a grass trimmer 200, as shown in fig. 7, the grass trimmer 200 comprises the detection device 100. The grass trimmer 200 has the structure and the beneficial effects of the detection device 100, and will not be described here again. Specifically, the grass trimmer 200 further comprises a mounting frame 201 and a grass trimming device 202, the grass trimming device 202 is arranged on the mounting frame 201, the grass trimming device 202 is used for driving the grass trimming rope to rotate to trim grass, the detection device 100 is arranged on the mounting frame 201 and is adjacent to the rotating path of the grass trimming rope, and the swing arm 4 of the detection device 100 is located on the rotating path of the grass trimming rope when naturally drooping, so that the length of the grass trimming rope can be detected.

In some embodiments, as shown in fig. 7, the grass cutter 200 further includes a cutting member 203, the cutting member 203 being configured to cut the grass rope. Specifically, the cutting member 203 is disposed on the mounting frame 201 and is located on a side of the detecting device 100 away from the mowing device 202, and the cutting member 203 is further located on a rotation path of the mowing rope, when the mowing rope is too long, the redundant mowing rope can strike the cutting member 203 to be cut off by the cutting member 203, so that the redundant mowing rope is removed. Optionally, the cutting member 203 is a blade, and is detachably disposed on the mounting frame 201.

The grass trimmer 200 of the embodiment of the utility model works: the grass mowing device 202 drives the grass mowing rope to rotate to mow grass, as shown in fig. 3, at the moment, the limiting mechanism 6 limits the rotation angle of the rotating shaft 3 to be a first angle through the extrusion limiting piece 5, so that the swing arm 4 is spaced from the rotation path of the grass mowing rope, and the grass mowing rope cannot strike the swing arm 4.

When the grass cutting machine 200 of the embodiment of the utility model needs to detect the length of the grass cutting rope: as shown in fig. 4, the limiting mechanism 6 releases the limiting piece 5, and the swing arm 4 naturally sags under the action of gravity and enters the rotating path of the straw rope; when the length of the grass beating rope meets the requirement, the grass beating rope can strike the swing arm 4, the swing arm 4 drives the rotating shaft 3 to rotate, the trigger piece 7 is driven to touch the sensor 8, and the touch sensor 8 triggers, so that the length of the grass beating rope can be judged to meet the requirement; when the length of the grass beating rope does not meet the requirement, the grass beating rope cannot strike the swing arm 4, so that the sensor 8 cannot trigger, and the length of the grass beating rope is judged to not meet the requirement.

When the grass cutting machine 200 of the embodiment of the utility model needs to cut redundant grass ropes: the grass cutting device 202 drives the grass cutting rope to rotate, and the redundant grass cutting rope can strike the cutting piece 203 to be cut off.

According to the detection device 100 and the grass trimmer 200 provided by the embodiment of the utility model, the swing arm 4 can be impacted by the grass trimming rope to drive the rotating shaft 3 to rotate, the sensor 8 can judge whether the grass trimming rope impacts the swing arm 4 according to the rotating angle of the rotating shaft 3, so that the automatic detection of the length of the grass trimming rope is realized, and the detection efficiency of the length of the grass trimming rope can be improved; and the sensor 8 is arranged in the accommodating cavity 11, so that grass scraps are not easy to attach, and the problem that the grass scraps influence the detection effect can be solved. Still be provided with stop gear 6, stop gear 6 can be with the angle restriction of pivot 3 for first angle, and swing arm 4 and the rotatory route interval of beating the grass rope this moment to can improve the problem that the grass rope during operation touched detection device 100, be favorable to beating the normal work of grass rope. The push block 61 can slide to the stop position, improves the problem that swing arm 4 is constantly rotatory after being strikeed by the rope of beating grass, is favorable to stop gear 6 to restrict the angle of pivot 3 to first angle to can make swing arm 4 stop rotating immediately and carry out the detection next time.

Finally, it should be noted that the description of the utility model and the accompanying drawings illustrate preferred embodiments of the utility model, but the utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are not to be construed as additional limitations of the utility model, but are to be given the full breadth of the disclosure. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a detection device is applied to grass cutting machine, which characterized in that includes:

a housing provided with a receiving chamber;

the rotating shaft is rotatably arranged on the shell and comprises a first end extending into the accommodating cavity and a second end extending out of the shell;

the swing arm is connected with the second end and is used for driving the rotating shaft to rotate when being impacted by the grass mowing rope;

the sensor is arranged in the accommodating cavity and is used for detecting the rotation angle of the rotating shaft; and

the limiting mechanism is arranged in the accommodating cavity and is used for limiting the rotation angle of the rotating shaft to be a first angle so that the swing arm is spaced from the rotation path of the grass mowing rope.

2. The detection device according to claim 1, further comprising a limiting member disposed at a first end of the rotating shaft, the limiting member being provided with a first limiting surface; the limiting mechanism comprises a push block, the push block is arranged in the accommodating cavity in a sliding mode, the push block comprises a second limiting surface, the push block is used for applying acting force to the limiting piece, the limiting piece rotates under the acting force until the first limiting surface abuts against the second limiting surface, and the rotating shaft is driven to rotate to the first angle.

3. The detecting device according to claim 2, wherein the limiting mechanism includes a linear driver disposed in the accommodating chamber, the push block is disposed on a driving shaft of the linear driver, and the push block is configured to move toward or away from the limiting member under the driving of the driving shaft.

4. The test device of claim 2, wherein the sliding position of the pusher within the receiving cavity includes a stop position, the pusher being spaced from the limiter and interfering with a rotational path of the limiter when the pusher is in the stop position.

5. The device of claim 1, further comprising a trigger member disposed at a first end of the shaft, the trigger member configured to squeeze the sensor and trigger the sensor when the shaft is rotated to a second angle.

6. The detection device of claim 5, wherein the sensor comprises a trigger arm for triggering upon contact with the trigger member.

7. The detection device according to claim 1, wherein the swing arm is provided with a magnetic member; the sensor comprises a magnetic field sensor for triggering when the magnetic member passes.

8. The device according to any one of claims 1 to 7, further comprising a seal bearing provided to the housing, the shaft penetrating into the seal bearing.

9. A grass trimmer comprising a detection device as claimed in any one of claims 1 to 8.

10. A lawnmower as claimed in claim 9 further comprising a cutting element for cutting the grass rope.