Safety protection mechanism and mower

Abstract

The utility model discloses a safety protection mechanism, which relates to the field of safety protection of hay mowers and comprises a wheel shaft mounted on a hay mower body, a switching device mounted on the wheel shaft, and a sensing device arranged on the hay mower body. When the variation of the vertical distance of the top end of the wheel shaft relative to the height reference site on the shell of the mower exceeds a preset variation threshold range, the sensing device senses a switching signal of the switching device, and the mower executes a safety protection action according to the switching signal. A simple mechanical structure is utilized to generate the variable quantity when the mower bumps, then the variable quantity is converted into a switching signal for executing the safety protection action by a safety protection component (including a switching device and a sensing device) arranged on the mower body, and therefore the mower executes the safety protection action. No complex software algorithm is needed, and self safety protection can be achieved only through a simple mechanical structure.

Description

Technical Field

[0001] The utility model relates to the technical field of safety protection of lawn mowers, in particular to a safety protection mechanism and a lawn mower. Background Art

[0002] When a lawn mower, especially a robot lawn mower, is shaken too violently, the mowing disc may contact the soil and cause damage to the disc. Therefore, it is desired to have a safety protection mechanism so that the lawn mower can perform corresponding safety protection actions when similar abnormal situations occur.

[0003] In the prior art, software control is usually used to implement the safety protection function of the lawn mower. For example, a bump sensor is set on the lawn mower. When the bump intensity exceeds the preset threshold, the lawn mower uses a set of software control logic to control the mower disc to stop rotating and other safety protection actions. However, the software control method is costly, and determining whether the bump intensity exceeds the preset threshold requires complex data analysis and judgment, and the response speed is slow, making it difficult to intervene in time to perform safety protection actions. Utility Model Content

[0004] The utility model aims to trigger a robot lawn mower to autonomously intervene and perform safety protection actions when the robot lawn mower is abnormally bumpy through a mechanical structure, and provides a safety protection mechanism and a lawn mower.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a safety protection mechanism, including a wheel axle installed on a lawn mower body, a switch device installed on the wheel axle, and a sensor device provided on the lawn mower body. When the change in the vertical distance of the top end of the wheel axle relative to the height reference position on the housing of the lawn mower exceeds a preset change threshold range, the sensor device senses a switch signal of the switch device, and the lawn mower performs a safety protection action according to the switch signal.

[0006] Preferably, a limit block is fixedly mounted on the wheel axle, and the switch device is installed in the limit block.

[0007] Preferably, the switch device is a magnet, and the magnet is installed on one side of the limit block.

[0008] Preferably, the wheel axle extends into the wheel axle bracket and is fixed to the body of the lawn mower through the wheel axle bracket.

[0009] Preferably, the upper end of the wheel axle is provided with two annular grooves distributed upward and downward, a limit block is installed on the wheel axle between the two annular grooves, and retaining rings are clamped in the two annular grooves.

[0010] Preferably, a shaft sleeve is embedded and installed inside the wheel axle bracket, and a circular boss is formed at the bottom end of the wheel axle, and the circular boss and one side end surface of the shaft sleeve are in supporting contact with each other.

[0011] Preferably, a limit block for mounting the switch device is arranged above the shaft sleeve, and a preset distance is left between the limit block and the shaft sleeve so that the wheel axle can slide up and down.

[0012] Preferably, the wheel axle is provided with two annular grooves distributed in the upper and lower parts, and retaining rings are clamped in the two annular grooves. The two retaining rings are used to fix the limit block of the switch device on the wheel axle section between the two annular grooves.

[0013] Preferably, the safety protection mechanism also includes an axle limiting bracket, a buckle is provided on the axle limiting bracket, a buckle interface is provided on the axle bracket, the axle limiting bracket and the axle bracket are fixed to each other in a buckle manner through the buckle and the buckle interface; the switch device is accommodated in a accommodating cavity formed by the axle limiting bracket and the axle bracket that are fixed to each other.

[0014] Preferably, the sensor device is a Hall element.

[0015] A lawn mower is provided with the above-mentioned safety protection mechanism.

[0016] The beneficial effects of the utility model are:

[0017] When the lawn mower bumps violently to the point that the change in the vertical distance between the top of the wheel axle and the height reference point on the lawn mower's casing exceeds a preset change threshold range, the sensor device arranged on the lawn mower senses the switch signal of the switch device, and the lawn mower performs a safety protection action based on the switch signal, using a simple mechanical structure to generate the above-mentioned change when the lawn mower bumps, and then the safety protection component (including the switch device and the sensor device) arranged on the lawn mower body converts the change into a switch signal for executing the safety protection action. The lawn mower therefore performs the safety protection action without the need for complex software algorithms, and achieves its own safety protection only through a simple mechanical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded view of the axle installation structure of the utility model;

[0019] Figure 2 It is a bottom view of the body of the utility model;

[0020] Figure 3 For this utility model Figure 2 Middle AA section view;

[0021] Figure 4 This is a structural diagram of the utility model in which a magnet is close to a Hall element.

[0022] In the figure: 1, axle; 2, axle bracket; 3, fastener; 4, bushing; 5, retaining ring; 6, magnet; 7, limit block; 9, axle limit bracket; 10, Hall element; 11, circular boss; 12, annular groove; 13, buckle; 14, buckle interface; 15, top; 16, height reference point. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 3 The present embodiment provides a safety protection mechanism, including a wheel axle 1, a wheel axle bracket 2, a shaft sleeve 4, a wheel axle limit bracket 9, a limit block 7, a magnet 6, and a Hall element 10. The wheel axle 1 is installed in the wheel axle bracket 2. Mounting blocks are fixedly installed on both sides of the bottom of the wheel axle bracket 2. The mounting blocks are provided with mounting holes. Fasteners 3 are inserted into the mounting holes. The fasteners 3 are used to install the wheel axle 1 together with the chassis a of the machine body. The wheel axle bracket 2 is used to fix the wheel axle 1 on the machine body of the lawn mower.

[0025] The top of the axle bracket 2 is fixedly mounted with an axle limiting bracket 9, on which a buckle 13 is provided, and a buckle interface 14 is provided on the axle bracket 2. The axle limiting bracket 9 and the axle bracket 2 are fixed to each other in a buckle manner through the buckle 13 and the buckle interface 14; the switch device is accommodated in the accommodation cavity formed by the axle limiting bracket 9 and the axle bracket 2 fixed to each other. The axle limiting bracket 9 is provided with an axial hole, and the upper end of the axle 1 extends out of the axial hole. The axle limiting bracket 9 limits the axle 1 so that the axle 1 can only move up and down.

[0026] A circular boss 11 is formed on one side of the shaft of the wheel shaft 1, and the end surface of one side of the boss and the end surface of one side of the sleeve are in support contact with each other. Figure 1 As shown, the circular boss 11 is located below the shaft sleeve 4, and the circular boss 11 and one side end surface of the shaft sleeve 4 are mutually supported and contacted. The shaft sleeve 4 is embedded in the wheel axle bracket 2, and the wheel axle and the shaft sleeve are inserted into the shaft sleeve and connected with the shaft sleeve 4.

[0027] like Figure 1As shown, the upper end of the wheel axle 1 is provided with two annular grooves 12 distributed up and down, and a limit block bracket is installed on the wheel axle 1 between the two annular grooves 12, and a retaining ring 5 is clamped in the two annular grooves 12. Grooves are provided at both ends of the limit block bracket, and the distance between the two grooves is equal to the distance between the two annular grooves 12. The retaining ring 5 can be inserted into the groove and clamped with the annular groove 12, and the limit block bracket is fixed on the wheel axle section between the two annular grooves 12, and the limit block 7 is placed in the limit block bracket.

[0028] When installing the limit block bracket, the limit block bracket is installed on the axle 1 between the two annular grooves, and then the retaining ring 5 is inserted into the groove, and the retaining ring 5 is snapped together with the annular groove 12, so that the limit block bracket and the axle 1 are installed together.

[0029] like Figure 3-4 As shown, a limit block 7 for installing the switch device is arranged above the shaft sleeve 4, and a preset distance is left between the limit block 7 and the shaft sleeve 4 so that the wheel shaft 1 can slide up and down.

[0030] A magnet 6 is fixedly mounted on one side of the limit block. Figure 1 As shown, a U-shaped opening is provided on one side of the axle bracket 2, and the stopper 7 and the magnet are located in the U-shaped opening and can move up and down in the U-shaped opening. There is a certain distance between the stopper 7 and the sleeve 4, so that the stopper 7 can slide up and down. There is also a distance between the magnet 6 and the housing, so that the stopper 7 and the magnet 6 can move up and down.

[0031] like Figure 3 As shown, the Hall element 10 is mounted on one side of the chassis a of the machine body. A buzzer is also fixedly mounted on the machine body. When the controller receives the safety protection action execution signal sent by the sensor device, the controller sends a buzzer signal to the buzzer to control the buzzer to sound an alarm.

[0032] like Figure 4 As shown, a height reference point 16 is also provided on the housing of the lawn mower, and the height reference point 16 is at a position close to the wheel axle 1. Figure 3 The vertical distance between the two in the non-slip state is used as a preset change threshold. In order to reduce the malfunction of the lawn mower in performing safety protection, preferably, a certain value is floated up and down on the basis of the change threshold to form a change threshold range.

[0033] like Figure 3 As shown, in a normal state, under the pressure of the lawn mower body, the body and the top of the axle 1 overlap together to support the body. There is a distance between the limit block bracket and the sleeve 4, and the limit block bracket, the limit block 7 and the magnet 6 are located at the top of the inner cavity of the axle bracket 2. The top 15 of the axle 1 is against the housing to support the housing. At this time, the vertical change of the top 15 of the axle 1 is 0.

[0034] like Figure 4 As shown, when the axle 1 slides down, the magnet 6 slides down with the axle 1, and the top 15 of the axle 1 moves downward toward the height reference position 16. Once the sliding distance exceeds the preset change threshold range, the magnet 6 approaches the sensing distance of the Hall element 10, and the Hall element 10 sends a safety protection action execution signal to the controller, and then the controller controls the mower to perform the corresponding safety protection action, such as stopping the mowing disc, stopping walking, etc., and the buzzer sounds at the same time. When the magnet is away from the Hall element, the machine remains stationary and needs to be restarted before it can continue to run.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety protection mechanism, characterized in that: The invention comprises a wheel axle (1) mounted on a lawn mower body, a switch device being mounted on the wheel axle (1), and a sensor device being arranged on the lawn mower body. When the change in the vertical distance between the top end (15) of the wheel axle (1) and a height reference point (16) on the housing of the lawn mower exceeds a preset change threshold range, the sensor device senses a switch signal of the switch device, and the lawn mower performs a safety protection action according to the switch signal.

2. The safety protection mechanism according to claim 1, characterized in that: A limit block (7) is fixedly mounted on the wheel axle (1), and the switch device is mounted in the limit block (7).

3. The safety protection mechanism according to claim 2, characterized in that: The switch device is a magnet (6), and the magnet (6) is installed on one side of the limit block (7).

4. The safety protection mechanism according to claim 1, characterized in that: The wheel axle (1) extends into the wheel axle bracket (2) and is fixed to the body of the lawn mower via the wheel axle bracket (2).

5. The safety protection mechanism according to claim 4, characterized in that: A shaft sleeve (4) is embedded and installed inside the wheel axle bracket (2), and a circular boss (11) is formed at the bottom end of the wheel axle (1), and the circular boss (11) and one side end surface of the shaft sleeve (4) are in supporting contact with each other.

6. The safety protection mechanism according to claim 5, characterized in that: A limit block (7) for mounting the switch device is arranged above the shaft sleeve (4), and a preset distance is left between the limit block (7) and the shaft sleeve (4) so ​​that the wheel shaft (1) can slide up and down.

7. A safety protection mechanism according to claim 5, characterized in that: The wheel axle (1) is provided with two annular grooves (12) distributed in an upper and lower direction, and retaining rings (5) are clamped in the two annular grooves (12). The two retaining rings (5) are used to set a limit block (7) for installing the switch device on the wheel axle section between the two annular grooves (12).

8. The safety protection mechanism according to claim 4, characterized in that: It also comprises an axle limiting bracket (9), the axle limiting bracket (9) being provided with a buckle (13), the axle bracket (2) being provided with a buckle interface (14), the axle limiting bracket (9) and the axle bracket (2) being fixed to each other in a buckle manner via the buckle (13) and the buckle interface (14); the switch device being accommodated in an accommodation cavity formed by the axle limiting bracket (9) and the axle bracket (2) being fixed to each other.

9. The safety protection mechanism according to claim 1, characterized in that: The sensor device is a Hall element (10).

10. A lawn mower, characterized in that: A safety protection mechanism as described in any one of claims 1 to 9 is provided.

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