Wheel tools

Abstract

The present invention relates to a wheeled working tool, which adopts double floating technology to reduce collision force. When a main machine collides with an obstacle, the floating cover and the main machine move relative to each other, which triggers the operation of a safety component, and controls the main machine to brake through the safety component, so as to realize the first stage of floating trigger switch function. Due to the effect of inertia force, the main machine will continue to move forward after braking, and the resistance of the buffer structure to the floating cover will also increase accordingly, thereby increasing the kinetic energy consumed by the main machine braking and reducing the collision force on the obstacle, so as to realize the second stage of floating to increase the buffer distance function. When the floating cover moves relative to the main machine and exceeds the preset displacement, the resistance of the buffer structure to the floating cover shows a trend of unchanged or decreasing. Therefore, as the main machine continues to impact the obstacle, the resistance of the buffer structure to the floating cover remains relatively unchanged or decreases, effectively weakening or preventing the main machine from continuing to increase the thrust of the floating cover, thereby ensuring the collision safety of the obstacle.

Description

Technical Field

[0001] The invention relates to the technical field of anti-collision, in particular to a wheeled working tool. Background Art

[0002] With the rapid development of science and technology, in various fields such as agriculture, forestry, and industry, wheeled tools (such as lawn mowers, sweepers, seeders, vacuum cleaners, AGV carts, etc.) have gradually replaced traditional mechanized or manual operations, which not only reduces labor input costs, but also saves operation time and improves operation efficiency.

[0003] In order to mitigate the collision with obstacles, traditional wheeled working tools usually connect the floating cover to the main machine through rubber columns, and use the deformation of the rubber columns to offset part of the impact force on the obstacle. However, when the main machine collides with the obstacle, even if the brakes are triggered in time, the rubber columns continue to deform as the main machine moves forward. In this way, the thrust of the main machine on the floating cover continues to increase, and the collision force of the floating cover on the obstacle also increases, thereby endangering the safety of the obstacle. Summary of the invention

[0004] Based on this, it is necessary to provide a wheeled working tool that can effectively reduce or prevent the thrust of the main machine on the floating cover from continuing to increase when a collision occurs, thereby ensuring collision safety with obstacles.

[0005] A wheeled working tool, the wheeled working tool comprising: a main machine; a floating cover, the floating cover is sleeved on the main machine and can move relative to the main machine; a buffer structure, the buffer structure is arranged between the main machine and the floating cover, before the floating cover moves relative to the main machine to reach a preset displacement, the resistance of the buffer structure to the floating cover tends to increase, after the floating cover moves relative to the main machine beyond the preset displacement, the resistance of the buffer structure to the floating cover tends to remain unchanged or decrease; a safety component, the safety component is electrically connected to the main machine, when the floating cover moves relative to the main machine, the safety component is triggered to operate, at least a part of the safety component is used to control the main machine to perform a braking action.

[0006] The above-mentioned wheeled working tool adopts double floating technology to reduce the collision force. When the main machine collides with the obstacle, the floating cover moves relative to the main machine under the action of the impact force. After the floating cover moves relative to the main machine, the safety component will be triggered to work, and the main machine will be controlled by the safety component to brake, so as to realize the first stage of floating trigger switch function. Due to the action of inertia force, the main machine after braking will continue to move forward, so that the displacement of the floating cover relative to the main machine will increase. At this time, the resistance of the buffer structure to the floating cover will also increase, increasing the kinetic energy consumed by the main machine braking and reducing the collision force on the obstacle, so as to realize the second stage of floating increase buffer distance function. When the displacement of the floating cover relative to the main machine exceeds the preset displacement, the resistance of the buffer structure to the floating cover shows a trend of unchanged or decreasing. Therefore, as the main machine continues to impact the obstacle, the resistance of the buffer structure on the floating cover remains relatively unchanged or decreases, so that the pressure of the floating cover on the obstacle also remains relatively unchanged or decreases, effectively weakening or avoiding the thrust of the main machine on the floating cover to continue to increase, and ensuring the collision safety of the obstacle.

[0007] In one embodiment, the buffer structure includes a movable part and a buffer part, the floating cover moves relative to the main machine through the movable part, the buffer part is arranged between the main machine and the floating cover, before the floating cover moves relative to the main machine to reach the preset displacement, the resistance of the buffer part to the floating cover tends to increase, and after the floating cover moves relative to the main machine beyond the preset displacement, the resistance of the buffer part to the floating cover tends to remain unchanged or decrease.

[0008] In one embodiment, the movable part is an elastic part, the buffer structure also includes a sliding seat, the sliding seat is slidably mounted on the host, the elastic part is connected between the floating cover and the sliding seat, and the buffer is connected between the host and the sliding seat.

[0009] In one embodiment, the buffer structure further includes a guide rail, the guide rail is disposed on the host, and the sliding seat is slidably matched with the guide rail.

[0010] 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 host, and the buffer member is connected between the host and the floating cover.

[0011] In one embodiment, the floating cover is provided with a first limiting portion, and the host is provided with a second limiting portion, the first limiting portion cooperates 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.

[0012] In one embodiment, the buffer is a constant force spring or a self-restoring damper.

[0013] In one embodiment, there are more than two buffer structures, and the two or more buffer structures are arranged between the floating cover and the host at intervals.

[0014] In one embodiment, the safety component includes a sensing end and a first trigger end both electrically connected to the host, and either the sensing end or the first trigger end is disposed on the floating cover, and the other is disposed on the host. When the sensing end and the first trigger end are misaligned or relative to each other, the host is controlled to perform a braking action.

[0015] In one embodiment, the safety component also includes a second trigger end electrically connected to the host, the first trigger end and the second trigger end are both arranged on the floating cover or the host, and the first trigger end and the second trigger end are arranged in sequence along the moving direction of the host, and when the sensing end and the second trigger end are misaligned or relative to each other, the host is controlled to decelerate and move, so that when the sensing end cooperates with the first trigger end, the moving speed of the host is reduced to a preset speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic structural diagram of a wheeled working tool with a sliding seat according to an embodiment;

[0019] Figure 2 for Figure 1 A schematic diagram of a collision process of the wheeled working tool described in;

[0020] Figure 3 is a schematic structural diagram of a wheeled working tool with a variable stiffness spring according to an embodiment;

[0021] Figure 4 It is a schematic structural diagram of a wheeled working tool with a rotating shaft described in one embodiment;

[0022] Figure 5 It is a schematic structural diagram of a wheeled working tool with a rotating shaft described in another embodiment;

[0023] Figure 6 It is a schematic diagram of the structure of a wheeled working tool with a deceleration function described in one embodiment.

[0024] 100. Wheeled working tool; 110. Main machine; 111. Second limiting part; 112. Limiting block; 120. Floating cover; 121. First limiting part; 130. Buffer structure; 131. Buffer member; 132. Movable member; 1321. Elastic member; 1322. Rotating shaft; 133. Sliding seat; 134. Guide rail; 1341. Third limiting part; 135. Pull rope; 136. Variable stiffness spring; 140. Safety component; 141. Sensing end; 142. First trigger end; 143. Second trigger end; 200. Obstacle. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0026] In one embodiment, please refer to Figure 1 A wheeled working tool 100, the wheeled working tool 100 comprises: a main machine 110, a floating cover 120, a buffer structure 130 and a safety component 140. The floating cover 120 is sleeved on the main machine 110, and the floating cover 120 can move relative to the main machine 110. The buffer structure 130 is arranged between the main machine 110 and the floating cover 120. Before the floating cover 120 moves relative to the main machine 110 to reach a preset displacement, the resistance of the buffer structure 130 to the floating cover 120 tends to increase. After the floating cover 120 moves relative to the main machine 110 beyond the preset displacement, the resistance of the buffer structure 130 to the floating cover 120 tends to remain unchanged or decrease. The safety component 140 is electrically connected to the main machine 110. When the floating cover 120 moves relative to the main machine 110, the safety component 140 is triggered to operate. At least a part of the safety component 140 is used to control the main machine 110 to perform a braking action.

[0027] The above-mentioned wheeled working tool 100 adopts double floating technology to reduce the collision force. When the main machine 110 collides with the obstacle 200, the floating cover 120 moves relative to the main machine 110 under the action of the impact force. After the floating cover 120 moves relative to the main machine 110, the safety component 140 will be triggered to work, and the main machine 110 will be controlled by the safety component 140 to brake, so as to realize the first stage of floating trigger switch function. Due to the action of inertial force, the main machine 110 will continue to move forward after braking, so that the displacement of the floating cover 120 relative to the main machine 110 increases. At this time, the resistance of the buffer structure 130 to the floating cover 120 also increases, which increases the kinetic energy consumed by the braking of the main machine 110 and reduces the collision force on the obstacle 200, so as to realize the second stage of floating to increase the buffer distance function. When 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 remains unchanged or decreases. Therefore, as the host 110 continues to impact the obstacle 200, the resistance of the buffer structure 130 on the floating cover 120 remains relatively unchanged or decreases, so that the pressure of the floating cover 120 on the obstacle 200 also remains relatively unchanged or decreases, effectively weakening or preventing the thrust of the host 110 on the floating cover 120 from continuing to increase, thereby ensuring the collision safety of the obstacle 200. In order to facilitate understanding of the moving direction of the host 110 in this embodiment, Figure 6 For example, the moving direction of the host 110 is Figure 6 Medium S 0 Indicates the direction.

[0028] It should be noted that the increasing trend of the resistance of the buffer structure 130 to the floating cover 120 should be understood as follows: 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 remaining unchanged, and then continuing to increase, etc., but the overall trend is to show an increasing effect. Similarly, the unchanged trend of the resistance of the buffer structure 130 to the floating cover 120 should also be understood as follows: during the force application process, due to various external factors, such as external vibrations or the instability of the material properties themselves, the force application process presents small fluctuations within a certain range, such as: when the moving displacement exceeds the preset displacement, the resistance will increase or decrease slightly within a certain resistance value, but the overall trend is unchanged or reduced. In addition, the preset displacement needs to be determined according to the anti-collision performance of the actual product and the performance of the buffer structure 130 used.

[0029] It should also be noted that there are many ways to implement the two-stage different resistance of the buffer structure 130, which is not specifically limited in this embodiment. It is only necessary to meet the requirement that before the preset displacement, the resistance tends to increase; after the preset displacement, the resistance tends to remain unchanged or decrease. 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 spring and winding combination structure. Among them, when the buffer structure 130 is a spring and winding combination structure, one end of the spring is clamped on the main body and connected to the winding wire; or, the spring is directly connected to the winding wire, and the winding wire has a certain damping rotation. When the spring elastic force reaches a certain force, one end of the spring is disconnected from the main machine 110 and pulls the winding wire 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. At this time, the elastic force on the spring tends to remain unchanged or decrease.

[0030] In addition, the floating cover 120 can be moved relative to the host 110 by adding a floating structure between the floating cover 120 and the host 110, or the buffer structure 130 can be directly used to achieve floating connection, for example: Figure 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 .

[0031] Optionally, the wheeled working tool may be a lawn mower, a sweeper, a seed drill, a vacuum cleaner, an AGV or other wheeled equipment.

[0032] Specifically, the wheeled working tool is an automatic lawn mower. The host 110 includes a housing, a mobile module and a working module. The mobile module and the working module are installed on the housing. The mobile module is used to drive the automatic lawn mower to move. In this embodiment, the mobile module includes a wheel set driven by a drive motor. Of course, in other embodiments, the mobile module may also include a crawler. The working module is used to perform work tasks.

[0033] In this embodiment, the working module includes a cutting assembly driven by a cutting motor to perform working tasks, specifically including a cutter disc and a blade installed on the cutter disc. The host 110 also includes an energy module, specifically including one or more battery packs, which are installed on the shell to provide energy for the automatic lawn mower to move and work. The battery pack is fixedly or detachably installed on the shell. Of course, the automatic lawn mower can also include various sensors for realizing various functions such as collision detection and lift detection. The automatic lawn mower also includes a control module, which is used to control the moving module to drive the automatic lawn mower to move, and control the working module to perform working tasks.

[0034] For further information, please refer to Figure 1The buffer structure 130 includes a movable member 132 and a buffer member 131. The floating cover 120 moves relative to the host 110 through the movable member 132. In this way, the floating cover 120 is in an active state on the host 110 through the movable member 132. When the host 110 collides, the floating cover 120 can move relative to the host 110 front and back, left and right, so that the floating cover 120 can trigger the safety component 140 to work and increase the buffer distance function in time, providing an active basis for realizing the double floating technology. At the same time, the buffer member 131 is arranged between the host 110 and the floating cover 120. Before the floating cover 120 moves relative to the host 110 to reach a preset 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 131 to the floating cover 120 tends to remain unchanged or decrease. In this way, the buffer 131 makes the floating cover 120 experience the process of increasing resistance and unchanged or decreasing resistance in sequence during the relative movement, effectively weakening or preventing the thrust of the host 110 on the floating cover 120 from continuing to increase, thereby ensuring the collision safety of the obstacle 200.

[0035] Optionally, the movable member 132 may be an elastic member 1321 or an axis structure. When the movable member 132 is an elastic member 1321, the elastic member 1321 may be an elastic structure such as elastic rubber, elastic metal sheet, spring or torsion spring.

[0036] In another embodiment, please refer to Figure 3 When the buffer member 131 is a variable stiffness spring 136, the buffer structure 130 may not include the movable member 132. 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 stiffness spring 136 between the floating cover 120 and the host 110 not only increases the buffer distance and keeps the resistance constant or reduced, but also keeps the floating cover 120 stably floatingly supported on the host 110. The variable stiffness spring 136 is a spring whose elastic force increases with the increase of the deformation amount, and when the elastic force reaches a certain value, it does not continue to increase with the increase of the deformation amount, and at this time the elastic force remains relatively constant.

[0037] For further information, please refer to Figure 1, the movable member 132 is an elastic member 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. It can be seen that when the host 110 collides, the floating cover 120 moves relative to the host 110 under the action of the collision force. 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 preset displacement, since the resistance of the buffer 131 to the floating cover 120 is unchanged or decreasing, the resistance of the buffer 131 on the sliding seat 133 is also unchanged or decreasing. At this time, the elastic member 1321 no longer continues to deform, and the elastic force on the floating cover 120 is also unchanged, which effectively prevents the pressure of the floating cover 120 on the obstacle 200 from increasing due to the continued movement of the host 110. At the same time, when the floating cover 120 moves relative to the host 110, the safety component 140 is triggered to control the host 110 to brake, 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.

[0038] It should be noted that the present embodiment does not limit the triggering time of the safety component 140 during the relative movement of the floating cover 120. For example, the triggering time of the safety component 140 may be set when the floating cover 120 starts to move relative to each other; or, the triggering time of the safety component 140 may be set when the relative displacement of the floating cover 120 is less than the preset displacement; or, the triggering time of the safety component 140 may be set when the relative displacement of the floating cover 120 is equal to the preset displacement, etc.

[0039] Specifically, please refer to Figure 2 middle Figure 2 (a) Figure 2 (b) and Figure 2 (c) The triggering time of the safety component 140 is set when the relative displacement of the floating cover 120 is equal to the preset displacement. 1 At S, the floating cover 120 and the main body 110 are displaced in the opposite direction under the impact force. At this time, the elastic member 1321 is deformed. As the main body 110 continues to move forward, the deformation of the elastic member 1321 increases, and the elastic force on the floating cover 120 also increases. When the displacement between the floating cover 120 and the main body 110 reaches the preset displacement, the front end of the main body 110 is located at S 2At this point, the safety component 140 is triggered, and the host 110 is controlled to brake. At this point, the resistance of the buffer 131 to the floating cover 120 reaches a constant force, and the elastic member 1321 no longer continues to deform, so that the force of the floating cover 120 on the obstacle 200 remains unchanged or decreases. Finally, under the combined action of the brake and the floating cover 120, the host 110 finally stops at S 3 Place.

[0040] In one embodiment, please refer to Figure 1 The buffer structure 130 further includes a guide rail 134. The guide rail 134 is disposed on the host 110, and the sliding seat 133 slidably cooperates with the guide rail 134, so that the sliding seat 133 moves more smoothly on the host 110 through the guide rail 134, so that the buffer structure 130 can better increase the buffer distance for the floating cover 120.

[0041] For further information, please refer to Figure 1 , a third limiting portion 1341 is provided on the guide rail 134. The sliding seat 133 is limited and matched with the third limiting portion 1341 in the moving direction of the main machine 110. In this way, when the main machine 110 moves backward, the floating cover 120 moves relative to the main machine 110 under the action of the buffer 131, so that the sliding seat 133 is limited and matched with the third limiting portion 1341, so that the floating cover 120 is reset to the initial state and the structure of the wheeled working tool 100 is kept consistent. At the same time, when no collision occurs, the sliding seat 133 is limited on the third limiting portion 1341 under the action of the buffer 131, so that the floating cover 120 remains relatively stable on the main machine 110.

[0042] In another embodiment, please refer to Figure 4 and Figure 5 , the movable member 132 is a rotating shaft 1322. One end of the rotating shaft 1322 is rotatably connected to the floating cover 120, and the other end of the rotating shaft 1322 is rotatably connected to the host 110. The buffer member 131 is connected between the host 110 and the floating cover 120. It can be seen that the movable member 132 of this embodiment only provides an active 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 unchanged or decreases, so that the pressure of the floating cover 120 on the obstacle 200 is also unchanged or decreases, effectively reducing the damage to the obstacle 200 caused by the collision.

[0043] Specifically, opposite ends of the rotating shaft 1322 are connected to the floating cover 120 and the main body 110 via ball joints and joint bearings.

[0044] Optionally, one end of the buffer 131 may be directly connected to the floating cover 120 or indirectly connected to the floating cover 120. For example, one end of the buffer 131 is connected to the floating cover 120 via a pull rope 135; or one end of the buffer 131 is connected to the floating cover 120 via an intermediate structure such as a block, a plate, or a rod. Similarly, the other end of the buffer 131 may be directly connected to the host 110 or indirectly connected to the host 110.

[0045] Specifically, please refer to Figure 5 , one end of the buffer 131 is connected to the floating cover 120 through a drawstring 135, and the other end of the buffer 131 is directly connected to the host 110. At the same time, when the buffer 131 and the floating cover 120 are connected by the drawstring 135, two limit blocks 112 are arranged on the host 110 at intervals, and the drawstring 135 passes between the two limit blocks 112 and is connected to the floating cover 120. In this way, the limit blocks 112 on both sides support the drawstring 135, preventing the floating cover 120 from shaking to the left and right easily.

[0046] For further information, please refer to Figure 4 , the floating cover 120 is provided with a first limiting portion 121. The main machine 110 is provided with a second limiting portion 111. The first limiting portion 121 is limitedly matched with the second limiting portion 111 in the moving direction of the main machine 110. One end of the buffer 131 is connected to the main machine 110. The other end of the buffer 131 is connected to the first limiting portion 121 or the floating cover 120. In this way, when the main machine 110 retreats, the floating cover 120 moves along the moving direction of the main machine 110 under the action of the buffer 131, so that the first limiting portion 121 is limitedly matched with the second limiting portion 111, so that the floating cover 120 is reset to the initial state and the structure of the wheeled working tool 100 is kept consistent. At the same time, when the main machine 110 does not collide, the first limiting portion 121 is limitedly matched with the second limiting portion 111 under the action of the buffer 131, so that the floating cover 120 remains relatively stable under the joint action of the buffer 131 and the second limiting portion 111.

[0047] In one embodiment, please refer to Figure 1 , the buffer 131 is a constant force spring or a self-restoring damper. Among them, the constant force spring is a spring whose elastic force increases with the increase of deformation. When the elastic force increases to a certain value, the deformation continues to increase, and its elastic force remains constant or slightly decreases. At the same time, the self-restoring damper is a combination structure of an ordinary spring and a damping device, that is, one end of the spring is connected to the damping device. When the deformation elastic force of the spring exceeds the maximum resistance of the damping device, the damping device is stretched, and the deformation elastic force on the spring remains unchanged or decreases.

[0048] In one embodiment, please refer to Figure 1 There are more than two buffer structures 130. More than two buffer structures 130 are arranged between the floating cover 120 and the host 110 at intervals. In this way, by increasing the number of buffer structures 130, the buffering effect of the floating cover 120 above the host 110 is ensured to be better.

[0049] In one embodiment, please refer to Figure 6 The safety component 140 includes a sensing end 141 and a first trigger end 142 both electrically connected to the host 110. Either one of the sensing end 141 and the first trigger end 142 is disposed on the floating cover 120, and the other is disposed on the host 110. When the sensing end 141 and the first trigger end 142 are misaligned or opposite to each other, the host 110 is controlled to perform a braking action. Thus, when the floating cover 120 moves relative to the host 110, the sensing end 141 will be misaligned or opposite to the first trigger end 142, so that the sensing end 141 cooperates with the first trigger end 142 to trigger the host 110 to perform a braking action, thereby ensuring that the host 110 decelerates in time.

[0050] Optionally, the safety component 140 may be an infrared sensor switch, a Hall switch, a capacitive sensor switch, a piezoelectric sensor switch, etc. When the safety component 140 is a Hall switch, the sensing end 141 may be a magnet, and the first trigger end 142 may be a metal sheet or a semiconductor sheet.

[0051] For further information, please refer to Figure 6 , the safety component 140 also includes a second trigger end 143 electrically connected to the host 110. The first trigger end 142 and the second trigger end 143 are both arranged on the floating cover 120 or the host 110, and the first trigger end 142 and the second trigger end 143 are arranged in sequence along the moving direction of the host 110. When the sensing end 141 and the second trigger end 143 are misaligned or relative, the host 110 is controlled to decelerate and move, so that when the sensing end 141 cooperates with the first trigger end 141, the moving speed of the host 110 is reduced to a preset speed. It can be seen that the host 110 will trigger the deceleration action before braking. When the floating cover 120 moves relatively, the sensing end 141 will move relatively with the host 110. At this time, the second trigger end 143 will act on the sensing end 141 before the first trigger end 142, so that the host 110 decelerates and moves. In this way, the host 110 works at a lower speed, avoiding the problem of false triggering of the brake and not affecting normal work. In order to facilitate understanding of the moving direction of the host 110 in this embodiment, Figure 6 For example, the moving direction of the host 110 is Figure 6 Medium S 0 Indicates the direction.

[0052] It should be noted that the preset speed can be determined according to actual product performance and user needs, and this embodiment does not make any specific limitation. It only needs to ensure that when the host 110 slows down, the sensing end 141 will not stop before the first trigger end 142, and ensure that the sensing end 141 can still cooperate with the first trigger end 142 when the host 110 slows down, that is, the preset speed is at least greater than 0.

[0053] Specifically, please refer to Figure 6 When the safety component 140 is a Hall switch, the sensing end 141 can be a magnet, and the first trigger end 142 and the second trigger end 143 are both metal sheets or semiconductor sheets.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. A wheeled working tool, characterized in that: The wheeled working tool comprises: Host; A floating cover, wherein the floating cover is sleeved on the main machine and can move relative to the main machine; A buffer structure, wherein the buffer structure comprises a movable part and a buffer part, wherein the floating cover moves relative to the host through the movable part, and the buffer part is arranged between the host and the floating cover, and before the floating cover moves relative to the host to reach a preset displacement, the resistance of the buffer part to the floating cover tends to increase, and after the floating cover moves relative to the host beyond the preset displacement, the resistance of the buffer part to the floating cover tends to remain unchanged or decrease; A safety component is electrically connected to the host. When the floating cover moves relative to the host, the safety component is triggered to operate. At least a part of the safety component is used to control the host to perform a braking action.

2. The wheeled working tool according to claim 1, characterized in that: The movable member is an elastic member, the buffer structure further comprises 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.

3. The wheeled working tool according to claim 2, characterized in that: The buffer structure also includes a guide rail, which is arranged on the main machine, and the sliding seat is slidably matched with the guide rail.

4. The wheeled working tool according to claim 1, characterized in that: The movable part is a rotating shaft, one end of which is rotatably connected to the floating cover, and the other end of which is rotatably connected to the host, and the buffer part is connected between the host and the floating cover.

5. The wheeled working tool according to claim 4, characterized in that: The floating cover is provided with a first limiting portion, and the host is provided with a second limiting portion. The first limiting portion cooperates 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.

6. The wheeled working tool according to any one of claims 1 to 5, characterized in that: The buffer is a constant force spring or a self-restoring damper.

7. The wheeled working tool according to any one of claims 1 to 5, characterized in that: There are more than two buffer structures, and the more than two buffer structures are arranged between the floating cover and the host at intervals.

8. The wheeled working tool according to any one of claims 1 to 5, characterized in that: The safety component includes a sensing end and a first trigger end both electrically connected to the host. Either the sensing end or the first trigger end is disposed on the floating cover, and the other is disposed on the host. When the sensing end and the first trigger end are misaligned or opposite to each other, the host is controlled to perform a braking action.

9. The wheeled working tool according to claim 8, characterized in that: The safety component also includes a second trigger end electrically connected to the host, the first trigger end and the second trigger end are both arranged on the floating cover or the host, and the first trigger end and the second trigger end are arranged in sequence along the moving direction of the host. When the sensing end and the second trigger end are misaligned or opposite to each other, the host is controlled to decelerate and move, so that when the sensing end cooperates with the first trigger end, the moving speed of the host is reduced to a preset speed.

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