CN214138488U - Wheel type working tool - Google Patents

Abstract

The utility model relates to a wheeled working tool adopts two flotation technique to reduce the impact. When the host computer collides with the barrier, the floating cover and the host computer can trigger the safety assembly to work after moving relatively, and the host computer is controlled to brake through the safety assembly so as to realize the function of the first-section floating trigger switch. Under the action of inertia force, the host machine after braking can continue to move forwards, the resistance of the buffer structure to the floating cover is increased, the kinetic energy consumed by braking of the host machine is increased, the collision force to the barrier is reduced, and the function of increasing the buffer distance by floating the second section is realized. When the movement displacement of the floating cover relative to the host exceeds the preset displacement, the resistance of the buffer structure to the floating cover is unchanged or reduced, so that the resistance of the buffer structure acting on the floating cover keeps unchanged or reduced relatively along with the impact of the host on the barrier, the thrust of the host on the floating cover is effectively weakened or prevented from being continuously increased, and the collision safety of the barrier is ensured.

Description

Wheel type working tool

Technical Field

The utility model relates to an anticollision technical field especially relates to wheeled working tool.

Background

With the rapid development of science and technology, in various fields of agriculture, forestry, industry and the like, the wheel type operation tools (such as a mower, a sweeper, a seeder, a dust collector, an AGV and the like) gradually replace the traditional mechanical operation or manual operation mode, so that the labor input cost is reduced, the operation time is saved, and the operation efficiency is improved.

In order to alleviate the collision with the obstacle, the conventional wheeled work tool usually connects the floating cover to the main frame through a rubber column, and uses the deformation of the rubber column to offset part of the impact force on the obstacle. However, when the host collides with the obstacle, even if the brake is triggered timely, the rubber column continues to deform along with the forward movement of the host, so that the thrust of the host to the floating cover continues to increase, and the collision force of the floating cover to the obstacle also increases, thereby endangering the safety of the obstacle.

SUMMERY OF THE UTILITY MODEL

Therefore, the wheel type working tool is needed to be provided, and when the wheel type working tool is collided, the thrust of the main machine to the floating cover is effectively weakened or avoided to be increased continuously, and the collision safety of the obstacles is ensured.

A wheeled work tool, the wheeled work tool comprising: a host; the floating cover is sleeved on the host machine and can move relative to the host machine; the buffer structure is arranged between the host and the floating cover, before the floating cover moves relative to the host to reach a preset displacement, the resistance of the buffer structure to the floating cover is in an increasing trend, and after the floating cover moves relative to the host to exceed the preset displacement, the resistance of the buffer structure to the floating cover is in a constant or decreasing trend; the safety assembly is electrically connected with the host, the floating cover is opposite to the host and triggers the safety assembly to operate when moving, and at least one part of the safety assembly is used for controlling the host to perform braking action.

The wheel type working tool adopts the double-floating technology to reduce the collision force. When the host collides with the barrier, the floating cover moves relative to the host under the action of the impact force. The floating cover and the host machine can trigger the safety assembly to work after moving relatively, and the host machine is controlled to brake through the safety assembly, so that the function of a first section of floating trigger switch is realized. Because under the effect of inertial force, the host computer behind the brake can continue to move forward for the relative host computer of floating cover removes the displacement increase, and at this moment, buffer structure also increases thereupon to the resistance of floating the lid, increases the kinetic energy that the host computer brake consumed, reduces the impact to the barrier, with the unsteady increase buffer distance function of realization second section. When the movement displacement of the floating cover relative to the host exceeds the preset displacement, the resistance of the buffer structure to the floating cover is in a constant or decreasing trend, so that the resistance of the buffer structure acting on the floating cover keeps relatively constant or decreasing trend as the host continuously impacts towards the obstacle, the pressure of the floating cover to the obstacle keeps relatively constant or decreasing trend, the thrust of the host to the floating cover is effectively weakened or prevented from continuously increasing, and the collision safety of the obstacle is ensured.

In one embodiment, the buffer structure includes a movable member and a buffer member, the floating cover moves relative to the host machine through the movable member, the buffer member is disposed between the host machine and the floating cover, the floating cover moves relative to the host machine to reach the preset displacement before, the buffer member increases the resistance of the floating cover, the floating cover moves relative to the host machine to exceed the preset displacement, and then the buffer member maintains the resistance of the floating cover or decreases the resistance of the floating cover.

In one embodiment, the movable member is an elastic member, the buffering structure further includes a sliding seat, the sliding seat is slidably mounted on the host, the elastic member is connected between the floating cover and the sliding seat, and the buffer member is connected between the host and the sliding seat.

In one embodiment, the buffer structure further includes a guide rail disposed on the host, and the sliding seat is in sliding fit with the guide rail.

In one embodiment, the movable member is a rotating shaft, one end of the rotating shaft is rotatably connected to the floating cover, the other end of the rotating shaft is rotatably connected to the main machine, and the buffer member is connected between the main machine and the floating cover.

In one embodiment, the floating cover is provided with a first limiting portion, the host is provided with a second limiting portion, the first limiting portion is in limiting fit with the second limiting portion in the moving direction of the host, one end of the buffer is connected to the host, and the other end of the buffer is connected to the first limiting portion or the floating cover.

In one embodiment, the damper is a constant force spring or a self-restoring damper.

In one embodiment, the number of the buffer structures is two or more, and the two or more buffer structures are arranged between the floating cover and the host at intervals.

In one embodiment, the safety component includes a sensing terminal and a first trigger terminal both electrically connected to the host, one of the sensing terminal and the first trigger terminal is disposed on the floating cover, the other one of the sensing terminal and the first trigger terminal is disposed on the host, and when the sensing terminal and the first trigger terminal are dislocated or opposite, the host is controlled to perform a braking operation.

In one embodiment, the safety component further includes a second trigger end electrically connected to the host, the first trigger end and the second trigger end are disposed on the floating cover or the host, and the first trigger end and the second trigger end are sequentially spaced along the moving direction of the host, and the sensing end and the second trigger end are dislocated or opposite to each other, and the host is controlled to decelerate so that the moving speed of the host is reduced to a predetermined speed when the sensing end is matched with the first trigger end.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Figure 1 is a schematic view of a wheeled work tool having a slide mount according to one embodiment;

figure 2 is a schematic view of the wheeled work tool of figure 1 during a collision;

figure 3 is a schematic diagram of a wheeled work tool having a variable rate spring according to one embodiment;

figure 4 is a schematic view of a wheeled work tool having an axis of rotation according to one embodiment;

figure 5 is a schematic view of another embodiment of a wheeled work tool having an axis of rotation;

fig. 6 is a schematic view of a wheeled work tool with a deceleration function according to an embodiment.

100. A wheeled work tool; 110. a host; 111. a second limiting part; 112. a limiting block; 120. a floating cover; 121. a first limiting part; 130. a buffer structure; 131. a buffer member; 132. a movable member; 1321. an elastic member; 1322. a rotating shaft; 133. a sliding seat; 134. a guide rail; 1341. a third limiting part; 135. pulling a rope; 136. a variable stiffness spring; 140. a security component; 141. a sensing end; 142. a first trigger terminal; 143. a second trigger terminal; 200. an obstacle.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In one embodiment, referring to fig. 1, a wheeled work tool 100, the wheeled work tool 100 includes: host 110, floating cover 120, buffer structure 130, and security component 140. The floating cover 120 is disposed on the host 110, and the floating cover 120 can move relative to the host 110. The buffer structure 130 is disposed between the host 110 and the floating cover 120. Before the floating cover 120 moves relative to the host 110 to reach the preset displacement, the resistance of the buffer structure 130 to the floating cover 120 is increased, and after the floating cover 120 moves relative to the host 110 beyond the preset displacement, the resistance of the buffer structure 130 to the floating cover 120 is unchanged or decreased. The security component 140 is electrically connected to the host 110. The floating cover 120, when moved relative to the host computer 110, triggers the security assembly 140 to operate. At least a portion of the safety component 140 is used to control the braking action of the host 110.

The wheel-type power tool 100 described above employs a double floating technique to reduce the collision force. When the host 110 collides with the obstacle 200, the floating cover 120 moves relative to the host 110 by the impact force. The floating cover 120 and the host 110 move relatively to trigger the safety assembly 140 to operate, and the safety assembly 140 controls the host 110 to perform a braking action, so as to implement the first stage floating trigger switch function. Under the action of the inertia force, the braked main body 110 will continue to move forward, so that the movement displacement of the floating cover 120 relative to the main body 110 is increased, at the moment, the resistance of the buffer structure 130 to the floating cover 120 is increased, the kinetic energy consumed by braking of the main body 110 is increased, the impact force on the obstacle 200 is reduced, and the function of increasing the buffer distance by the second stage of floating is realized. When the floating cover 120 moves and displaces relative to the host 110 beyond the preset displacement, the resistance of the buffer structure 130 to the floating cover 120 is kept unchanged or reduced, so that as the host 110 continues to impact against the obstacle 200, the resistance of the buffer structure 130 to the floating cover 120 is kept relatively unchanged or reduced, so that the pressure of the floating cover 120 to the obstacle 200 is also kept relatively unchanged or reduced, and the trend is shownEffectively weakening or avoiding the thrust of the main machine 110 on the floating cover 120 from increasing, and ensuring the collision safety of the barrier 200. For easy understanding of the moving direction of the host 110 in this embodiment, taking fig. 6 as an example, the moving direction of the host 110 is S in fig. 6₀The indicated direction.

It should be noted that the increasing resistance of the buffering structure 130 to the floating cover 120 is understood as: as the relative displacement between the floating cover 120 and the host 110 increases, the resistance of the buffer structure 130 to the floating cover 120 may gradually increase or may increase in stages, such as increasing first, then not changing, then continuing to increase, etc., but the overall trend is to exhibit an increasing effect. Likewise, the constant tendency of the resistance of the cushioning structure 130 to the floating cover 120 should be understood as: in the process of force application, due to various external factors, such as external vibration or unstable material properties, small fluctuation within a certain range is caused in the process of force application, for example: when the displacement exceeds the preset displacement, the resistance will slightly increase or slightly decrease within a certain resistance value, but the general trend is represented as an unchanged state or a decreased state. In addition, the predetermined displacement is determined according to the crashworthiness of the actual product and the performance of the adopted buffer structure 130.

It should be further noted that there are various ways to implement the two-stage different resistances of the buffer structure 130, and this embodiment is not particularly limited, and only needs to satisfy that the resistance is in an increasing trend before the preset displacement; after the displacement is preset, the resistance is not changed or is reduced. For example: the buffer structure 130 is a constant force spring, a self-restoring damper, a variable stiffness spring, a self-restoring resistor, or a combined spring and coil structure. Wherein, when the buffer structure 130 is a combined structure of a spring and a winding wire, one end of the spring is clamped on the main body and connected with the winding wire; or the spring is directly connected with the winding wire, and the winding wire has certain damping rotation. When the elasticity of the spring reaches a certain stress, one end of the spring is disconnected with the host 110, and the winding wire is pulled to rotate; or the elastic force on the spring overcomes the rotation damping of the winding wire and pulls the winding wire to start rotating, and at the moment, the elastic force on the spring is in a constant or decreasing trend.

In addition, the floating cover 120 can move relative to the host 110 by additionally adding a floating structure between the floating cover 120 and the host 110, or by directly using the buffer structure 130 to realize a floating connection, for example: referring to fig. 3, when the buffer structure 130 is a variable stiffness spring 136, the floating cover 120 is supported on the host 110 by the variable stiffness spring 136.

Alternatively, the wheeled work implement may be a mower, sweeper, planter, vacuum cleaner, AGV cart, or other wheeled device.

In particular, the wheeled work tool is an automatic lawn mower. The host 110 includes a housing, a mobile module, and a work module. The mobile module and the working module are mounted on the shell. The moving module is used for driving the automatic mower to move. In this embodiment, the moving module includes a wheel set driven by a driving motor. Of course, in other embodiments, the mobile module may include tracks. The work module is used for executing work tasks.

In this embodiment, the working module includes a cutting assembly driven by a cutting motor to perform a work task, and specifically includes a cutter head and a blade mounted to the cutter head. The main frame 110 further includes an energy module, specifically including one or more battery packs, mounted to the housing for providing energy for the robotic lawnmower to move and operate. The battery pack is fixedly or detachably mounted on the shell. Of course, the robotic lawnmower may also include various sensors for performing various functions such as collision detection, lift detection, and the like. The automatic mower also comprises a control module, and the control module is used for controlling the moving module to drive the automatic mower to move and controlling the working module to execute a working task.

Further, referring to fig. 1, the buffering structure 130 includes a movable element 132 and a buffering element 131. The floating cover 120 is moved relative to the host 110 by the movable member 132, such that the floating cover 120 is moved on the host 110 by the movable member 132. When the host 110 collides, the floating cover 120 can move back and forth and left and right relative to the host 110, so that the floating cover 120 can trigger the safety assembly 140 to work and increase the buffer distance in time, and a movable foundation is provided for realizing the double-floating technology. Meanwhile, the buffer member 131 is disposed between the host 110 and the floating cover 120. Before the floating cover 120 moves relative to the host 110 to reach the predetermined displacement, the resistance of the buffer member 131 to the floating cover 120 tends to increase. When the floating cover 120 moves beyond the preset displacement relative to the host 110, the resistance of the buffer member 131 to the floating cover 120 is in a constant or decreasing trend, so that the floating cover 120 sequentially experiences the processes of resistance increase and resistance constant or decrease in the relative movement process through the buffer member 131, the thrust of the host 110 to the floating cover 120 is effectively weakened or avoided to continue to increase, and the collision safety of the obstacle 200 is ensured.

Alternatively, the movable member 132 may be an elastic member 1321, or may be an axial structure. When the movable element 132 is an elastic element 1321, the elastic element 1321 may be an elastic structure such as elastic rubber, elastic metal sheet, spring, or torsion spring.

In another embodiment, referring to fig. 3, when the buffer member 131 is the variable stiffness spring 136, the buffer structure 130 may not include the movable member 132, and in this case, the variable stiffness spring 136 is connected between the floating cover 120 and the host 110. It can be seen that the variable rate spring 136 acts both to increase the cushioning distance and to maintain the resistance constant or reduced between the floating cover 120 and the host 110, and to maintain the floating cover 120 stably floatingly supported on the host 110. The variable stiffness spring 136 has an elastic force that increases with the amount of deformation, and when the elastic force reaches a certain value, the elastic force does not increase with the amount of deformation, and at this time, the elastic force remains relatively constant.

Further, referring to fig. 1, the movable element 132 is an elastic element 1321. The buffer structure 130 further includes a sliding seat 133. The sliding seat 133 is slidably mounted on the host 110. The elastic member 1321 is connected between the floating cover 120 and the sliding seat 133. The buffer member 131 is connected between the host 110 and the sliding seat 133. As can be seen from this, when the main unit 110 collides, the floating cover 120 moves relative to the main unit 110 by the collision force, and at this time, the elastic member 1321 is deformed by tension, and the elastic resistance to the floating cover 120 tends to increase. When the relative displacement between the floating cover 120 and the host 110 exceeds the predetermined displacement, the resistance of the buffer 131 to the floating cover 120 is unchanged or decreases, so the resistance of the buffer 131 to the sliding seat 133 is also unchanged or decreases, at this time, the elastic element 1321 is not deformed any more, and the elastic force to the floating cover 120 is also unchanged, thereby effectively avoiding the pressure of the floating cover 120 to the obstacle 200 from increasing due to the continuous forward movement of the host 110. Meanwhile, after the floating cover 120 moves relative to the host 110, the safety assembly 140 is triggered to control the host 110 to perform a braking action, so that the host 110 is decelerated in time under the combined action of the brake and the floating cover 120 until the movement stops.

It should be noted that the present embodiment does not limit the triggering time of the safety assembly 140 during the relative movement of the floating cover 120, such as: the triggering time of the safety assembly 140 may be set when the floating cover 120 starts to move relatively; alternatively, the triggering time of the safety assembly 140 is set when the relative displacement of the floating cover 120 is smaller than the preset displacement; alternatively, the triggering time of the safety assembly 140 is set when the relative displacement of the floating cover 120 is equal to the preset displacement, or the like.

Specifically, referring to fig. 2(a), 2(b) and 2(c) of fig. 2, the triggering time of the safety assembly 140 is set to be equal to the predetermined displacement of the floating cover 120. When the host 110 collides, the front end of the host 110 is located at S₁Here, the floating cover 120 is displaced in the opposite direction to the main body 110 by the impact force. At this time, the elastic member 1321 is deformed. As the main body 110 continues to advance, the deformation of the elastic member 1321 increases, and the elastic force applied to the floating cover 120 also increases. When the displacement between the floating cover 120 and the host 110 reaches a predetermined displacement, the front end of the host 110 is located at S₂The safety component 140 is triggered to control the braking action of the host 110. At this time, the resistance of the buffer member 131 to the floating cover 120 reaches a constant force, and at this time, the elastic member 1321 does not continuously deform, so that the force of the floating cover 120 to the obstacle 200 is constant or tends to decrease. Finally, the main body 110 is stopped at S by the combined action of the brake and the floating cover 120₃To (3).

In one embodiment, referring to fig. 1, the buffer structure 130 further includes a guide rail 134. The guide rail 134 is disposed on the main body 110, and the sliding seat 133 is slidably engaged with the guide rail 134, so that the sliding seat 133 can move more smoothly on the main body 110 through the guide rail 134, so that the buffering distance of the floating cover 120 is better increased by the buffering structure 130.

Further, referring to fig. 1, a third position-limiting portion 1341 is disposed on the guide rail 134. The sliding seat 133 is in spacing fit with the third limiting portion 1341 in the moving direction of the main machine 110, so that when the main machine 110 moves backwards, the floating cover 120 moves relative to the main machine 110 under the action of the buffer member 131, and the sliding seat 133 is in spacing fit with the third limiting portion 1341, thereby ensuring that the floating cover 120 is reset to an initial state and ensuring that the structure of the wheel type working tool 100 is consistent. Meanwhile, when no collision occurs, the sliding seat 133 is limited on the third limiting portion 1341 by the buffer 131, so that the floating cover 120 is kept relatively stable on the host 110.

In another embodiment, referring to fig. 4 and 5, the movable member 132 is a rotating shaft 1322. One end of the shaft 1322 is rotatably connected to the floating cover 120, and the other end of the shaft 1322 is rotatably connected to the main body 110. The buffer member 131 is connected between the host 110 and the floating cover 120. Therefore, the movable member 132 of the present embodiment only provides the movable state for the floating cover 120, and does not deform. When the floating cover 120 moves relative to the host 110, the floating cover 120 rotates above the host 110 and pulls the buffer member 131. As the relative movement increases, the resistance of the buffer member 131 to the floating cover 120 increases. When the relative displacement is equal to the preset displacement, the resistance of the buffer member 131 to the floating cover 120 is in a constant or decreasing trend, so that the pressure of the floating cover 120 to the obstacle 200 is in a constant or decreasing trend, and the damage of collision to the obstacle 200 is effectively reduced.

Specifically, the opposite ends of the rotating shaft 1322 are connected to the floating cover 120 and the main body 110 through ball joints and joint bearings, respectively.

Alternatively, the buffer member 131 may be directly coupled to the floating cover 120 at one end thereof, or indirectly coupled to the floating cover 120. Such as: one end of the buffer member 131 is connected with the floating cover 120 through a pull rope 135; alternatively, one end of the buffer member 131 and the floating cover 120 are connected by an intermediate structure such as a block, a plate, or a rod. Similarly, the other end of the buffer member 131 can be directly connected to the host 110, or indirectly connected to the host 110.

Specifically, referring to fig. 5, one end of the buffer member 131 is connected to the floating cover 120 through the pull rope 135, and the other end of the buffer member 131 is directly connected to the host 110. Meanwhile, when the buffer member 131 is connected to the floating cover 120 by the pull rope 135, the two limit blocks 112 are disposed on the main unit 110 at intervals, and the pull rope 135 passes through the two limit blocks 112 and is connected to the floating cover 120. Thus, the two side stoppers 112 support the pull cord 135, and the floating cover 120 is prevented from easily rocking to the left and right sides.

Further, referring to fig. 4, a first position-limiting portion 121 is disposed on the floating cover 120. The host 110 is provided with a second position-limiting portion 111. The first position-limiting portion 121 is in position-limiting fit with the second position-limiting portion 111 in the moving direction of the host 110. One end of the buffer member 131 is connected to the host 110. The other end of the buffer member 131 is connected to the first position-limiting portion 121 or the floating cover 120, so that when the main body 110 moves backward, the floating cover 120 moves along the moving direction of the main body 110 under the action of the buffer member 131, so that the first position-limiting portion 121 and the second position-limiting portion 111 are in position-limiting fit, and thus, the floating cover 120 is ensured to be reset to an initial state, and the structure of the wheel-type working tool 100 is ensured to be consistent. Meanwhile, when the host 110 is not collided, the first position-limiting portion 121 is in position-limiting fit with the second position-limiting portion 111 under the action of the buffer member 131, so that the floating cover 120 is kept relatively stable under the combined action of the buffer member 131 and the second position-limiting portion 111.

In one embodiment, referring to fig. 1, the buffer member 131 is a constant force spring or a self-restoring damper. The constant force spring is a spring, the elastic force of which is increased along with the increase of the deformation amount, and when the elastic force is increased to a certain value, the deformation amount is continuously increased, and the elastic force keeps constant force or slightly decreases. Meanwhile, the self-recovery damper is a combined structure of a common spring and damping equipment, namely, one end of the spring is connected to the damping equipment, when the deformation elastic force of the spring exceeds the maximum resistance of the damping equipment, the damping equipment is stretched, and the deformation elastic force on the spring is kept unchanged or is in a reduced state.

In one embodiment, referring to fig. 1, there are more than two buffer structures 130. Two or more buffer structures 130 are arranged between the floating cover 120 and the host 110 at intervals, so that the floating cover 120 is guaranteed to buffer above the host 110 better by increasing the number of the buffer structures 130.

In one embodiment, referring to fig. 6, the security component 140 includes a sensing terminal 141 and a first triggering terminal 142 both electrically connected to the host 110. The sensing terminal 141 and the first triggering terminal 142. One disposed on the floating cover 120 and the other disposed on the host 110. When the floating cover 120 moves relative to the host 110, the sensing terminal 141 can be dislocated or opposite to the first trigger terminal 142, so that the sensing terminal 141 cooperates with the first trigger terminal 142 to enable the host 110 to brake, thereby ensuring that the host 110 is decelerated in time.

Alternatively, the safety component 140 may be an infrared sensing switch, a hall switch, a capacitive sensing switch, a piezoelectric sensing switch, or the like. When the safety assembly 140 is a hall switch, the sensing terminal 141 can be a magnet, and the first triggering terminal 142 can be a metal sheet or a semiconductor sheet.

Further, referring to fig. 6, the security component 140 further includes a second trigger 143 electrically connected to the host 110. The first trigger end 142 and the second trigger end 143 are disposed on the floating cover 120 or the host 110, and the first trigger end 142 and the second trigger end 143 are sequentially disposed at intervals along the moving direction of the host 110. When the sensing terminal 141 is misaligned or opposite to the second trigger terminal 143, the host 110 is controlled to perform deceleration movement, so that when the sensing terminal 141 is matched with the first trigger terminal 141, the moving speed of the host 110 is reduced to a preset speed. Therefore, before the main machine 110 brakes, the deceleration action is triggered first. When the floating cover 120 moves relatively, the sensing terminal 141 moves relatively to the host 110, and at this time, the second trigger terminal 143 acts on the sensing terminal 141 before the first trigger terminal 142, so that the host 110 performs deceleration movement, and thus the host 110 operates at a lower speed, thereby avoiding the problem of false triggering of a brake, and not affecting normal operation. For easy understanding of the moving direction of the host 110 in this embodiment, taking fig. 6 as an example, the moving direction of the host 110 is S in fig. 6₀The indicated direction.

It should be noted that the preset speed may be determined according to the actual product performance and the user requirement, and this embodiment is not particularly limited, and only needs to satisfy that when the host 110 moves at a reduced speed, the sensing terminal 141 does not stop before the first trigger terminal 142, and it is ensured that the sensing terminal 141 can still cooperate with the first trigger terminal 142 when the host 110 is at the reduced speed, that is, the preset speed is at least greater than 0.

Specifically, referring to fig. 6, when the safety component 140 is a hall switch, the sensing terminal 141 can be a magnet, and the first trigger terminal 142 and the second trigger terminal 143 are both metal sheets or semiconductor sheets.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., 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; can be mechanically or electrically connected; 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.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A wheeled work tool, characterized in that the wheeled work tool comprises:

a host;

the floating cover is sleeved on the host machine and can move relative to the host machine;

the buffer structure is arranged between the host and the floating cover, before the floating cover moves relative to the host to reach a preset displacement, the resistance of the buffer structure to the floating cover is in an increasing trend, and after the floating cover moves relative to the host to exceed the preset displacement, the resistance of the buffer structure to the floating cover is in a constant or decreasing trend;

the safety assembly is electrically connected with the host, the floating cover is opposite to the host and triggers the safety assembly to operate when moving, and at least one part of the safety assembly is used for controlling the host to perform braking action.

2. The wheeled work tool of claim 1, wherein said cushioning structure includes a movable member and a cushioning member, said floating cover moves relative to said main body through said movable member, said cushioning member is disposed between said main body and said floating cover, said cushioning member increases the resistance of said floating cover before said floating cover moves relative to said main body to said predetermined displacement, said cushioning member does not change or decreases the resistance of said floating cover after said floating cover moves relative to said main body to exceed said predetermined displacement.

3. The wheeled work tool of claim 2, wherein said movable member is an elastic member, said cushioning structure further comprising a sliding seat slidably mounted on said main body, said elastic member being connected between said floating cover and said sliding seat, said cushioning member being connected between said main body and said sliding seat.

4. A wheeled work tool according to claim 3, wherein the cushioning structure further comprises a guide rail provided on the main machine, the shoe being in sliding engagement with the guide rail.

5. The wheeled work tool of claim 2, wherein said movable member is a pivot shaft, one end of said pivot shaft being pivotally connected to said floating cover, the other end of said pivot shaft being pivotally connected to said main body, said cushioning member being connected between said main body and said floating cover.

6. The wheeled work tool of claim 5, wherein the floating cover has a first position-limiting portion, the main body has a second position-limiting portion, the first position-limiting portion is in position-limiting engagement with the second position-limiting portion in the direction of movement of the main body, one end of the buffer member is connected to the main body, and the other end of the buffer member is connected to the first position-limiting portion or the floating cover.

7. A wheeled work tool according to any one of claims 2 to 6, wherein the damping member is a constant force spring or a self-restoring damper.

8. A wheeled work tool according to any one of claims 1 to 6, wherein there are two or more of said cushioning structures, the two or more cushioning structures being spaced apart between the floating cover and the main machine.

9. A wheeled work tool according to any one of claims 1 to 6, wherein the safety assembly includes a sensing terminal and a first trigger terminal both electrically connected to the main machine, one of the sensing terminal and the first trigger terminal being provided on the floating cover and the other one of the sensing terminal and the first trigger terminal being provided on the main machine, the sensing terminal controlling the main machine to perform a braking action when the sensing terminal is misaligned or opposite to the first trigger terminal.

10. The wheeled work tool of claim 9, wherein the safety assembly further includes a second trigger end electrically connected to the main machine, the first trigger end and the second trigger end are disposed on the floating cover or the main machine, and the first trigger end and the second trigger end are sequentially spaced apart from each other along a moving direction of the main machine, and when the sensing end is misaligned or opposite to the second trigger end, the main machine is controlled to perform deceleration movement, so that when the sensing end is engaged with the first trigger end, a moving speed of the main machine is reduced to a preset speed.

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