Lifting structure and mower

Abstract

According to the lifting structure and the mower, the detection circuit is arranged on the reflection light path of the grid piece, the grid piece comprises the multiple light absorption units and the multiple light reflection units which are alternately arranged in the lifting direction, if light is reflected by the grid piece, the emitted light can irradiate the detection circuit, and the detection circuit cannot irradiate the detection circuit; when no light irradiates on the detection circuit, the detection circuit generates a first level signal, and when light irradiates on the detection circuit, the detection circuit generates a second level signal, so that the detection circuit generates different level signals in the lifting process of the lifting rod, and the controller can determine whether the lifting rod ascends or descends. The controller can accurately calculate the moving distance of the lifting rod based on the lifting direction of the lifting rod and the level signal of the detection module, and then the height of the lifting rod can be accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of mowing, in particular to a lifting structure and a lawn mower. Background Art

[0002] A stepper motor is a discrete-value control motor that converts an electrical pulse excitation signal into a corresponding angular displacement or linear displacement. This motor moves one step whenever an electrical pulse is input. Currently, the lifting rod is controlled by a stepper motor for lifting, and the height is controlled by using a counting cloth method. However, this method may have a step-loss phenomenon, resulting in inaccurate height control. Summary of the Utility Model

[0003] The purpose of the embodiment of the utility model is to provide a lifting structure and a lawn mower to accurately determine the lifting height of the lifting rod. The specific technical solutions are as follows:

[0004] The embodiment of the utility model provides a lifting structure, including:

[0005] A motor, a lifting rod, a grid member, a light-emitting circuit, a detection circuit, and a controller; the grid member includes a plurality of light-absorbing units and a plurality of light-reflecting units, and the light-absorbing units and the light-reflecting units are alternately arranged in the lifting direction of the lifting rod;

[0006] The grid member is fixedly arranged on the lifting rod, and the lifting rod is in transmission connection with the motor; the controller is electrically connected to the detection circuit and the motor respectively;

[0007] The detection circuit is arranged on the reflection light path of the grid member, where the reflection light path is the light path formed by the light-reflecting unit in the grid member reflecting the light of the light-emitting circuit.

[0008] In a possible embodiment, the light-absorbing unit and the light-reflecting unit have the same size in the lifting direction.

[0009] In a possible embodiment, both the light-absorbing unit and the light-reflecting unit are rectangular structures.

[0010] In a possible embodiment, the size of the light-absorbing unit and the light-reflecting unit in the lifting direction is 1 cm.

[0011] In a possible embodiment, the light-absorbing unit is a black grid, and the light-reflecting unit is a white grid.

[0012] In a possible embodiment, the light-emitting circuit includes a first power supply, a first capacitor, and a light-emitting unit;

[0013] The first end of the first capacitor is connected to the first power supply and the anode of the light-emitting unit respectively, and the second end of the first capacitor is grounded;

[0014] The cathode of the light-emitting unit is grounded.

[0015] In a possible embodiment, the light-emitting unit is a light-emitting diode.

[0016] In a possible embodiment, the detection circuit includes a second power supply, a resistor, and a light-receiving unit;

[0017] The first end of the light-receiving unit is grounded, and the second end of the light-receiving unit is respectively connected to the first end of the resistor and the controller; the second end of the resistor is connected to the second power supply.

[0018] In a possible embodiment, the light-receiving unit is a photosensitive diode.

[0019] An embodiment of the present invention further provides a lawn mower, including: the lifting structure and the cutter head described in any one of the above;

[0020] The cutter head includes at least one cutting tool; the cutter head is fixedly arranged on the lifting rod.

[0021] In the lifting structure and the lawn mower provided by the embodiment of the present invention, the detection circuit is arranged on the reflection optical path of the grid member. The grid member includes a plurality of light-absorbing units and a plurality of light-reflecting units alternately arranged in the lifting direction. If there is light reflection on the grid member, the emitted light will irradiate on the detection circuit. When no light irradiates on the detection circuit, the detection circuit generates a first level signal. When light irradiates on the detection circuit, the detection circuit generates a second level signal, so that the detection circuit generates different level signals during the lifting and lowering of the lifting rod. The controller can determine whether the lifting rod is rising or falling. The controller can accurately calculate the moving distance of the lifting rod based on the lifting direction of the lifting rod and the level signal of the detection module, and then can accurately control the height of the lifting rod. Of course, any product implementing the present invention does not necessarily need to achieve all the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of a lifting structure provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a grid member of a lifting structure provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the lighting circuit and the detection circuit of the lifting structure provided by the embodiment of the present utility model;

[0026] Figure 4 The first schematic diagram of the lawn mower provided by the embodiment of the present utility model;

[0027] Figure 5 The second schematic diagram of the lawn mower provided by the embodiment of the present utility model;

[0028] Figure 6 A schematic diagram of the lighting circuit, the detection circuit and the grid member provided by the embodiment of the present utility model. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of the present utility model.

[0030] As Figure 1 - Figure 2 shown, Figure 1 A schematic diagram of the lifting structure provided by the embodiment of the present utility model, Figure 2 A schematic diagram of the grid member of the lifting structure provided by the embodiment of the present utility model, including:

[0031] A motor 110, a lifting rod 120, a grid member 130, a lighting circuit 140, a detection circuit 150, and a controller 160; the grid member 130 includes a plurality of light absorption units 131 and a plurality of light reflection units 132, and the light absorption units 131 and the light reflection units 132 are alternately arranged in the lifting direction of the lifting rod 120;

[0032] The grid member 130 is fixedly arranged on the lifting rod 120, and the lifting rod 120 is in transmission connection with the motor 110; the controller 160 is electrically connected to the detection circuit 150 and the motor 110 respectively;

[0033] The detection circuit 150 is arranged on the reflection light path of the grid member 130, wherein the reflection light path is the light path formed by the light reflection unit 132 in the grid member 130 reflecting the light of the lighting circuit 140.

[0034] The motor 110 can be a DC motor or a stepper motor. Among them, a stepper motor is a discrete-value control motor that converts an electrical pulse excitation signal into a corresponding angular displacement or linear displacement. This motor moves one step whenever an electrical pulse is input, so it is also called a pulse motor. The motor 110 is drivingly connected to the lifting rod 120. When the motor 110 operates, it can drive the lifting rod 120 to move up and down. For example, when the motor 110 rotates forward, the motor 110 can drive the lifting rod 120 to move downward when it operates. When the motor 110 rotates in reverse, the motor 110 can drive the lifting rod 120 to move upward when it operates. The specific definitions of the forward rotation and reverse rotation of the motor 110 can refer to the definition of the motor 110 in the related art, and are not specifically limited herein.

[0035] In one example, a motor housing is provided outside the motor, and a lifting rod is provided on the motor housing. The lifting rod can be connected to the transmission shaft of the motor. When the motor operates, it can drive the lifting rod to move. In another example, the lifting rod is connected to the motor through other connecting rods. For example, a connecting rod is provided on the motor housing, the connecting rod is connected to the transmission shaft of the motor, and the connecting rod is further connected to the lifting rod. When the motor operates, it can drive the connecting rod to move, and the connecting rod can drive the lifting rod to move.

[0036] The grid member 130 is composed of a plurality of light-absorbing units 131 and a plurality of light-reflecting units 132. Among them, the light-absorbing unit 131 is used to absorb light. It can be understood that when light irradiates on the light-absorbing unit 131, no light is reflected out. The light-reflecting unit 132 is used to reflect light. It can be understood that when light irradiates on the light-reflecting unit 132, the light is reflected out through the light-reflecting unit 132 to form a reflected light path, and the light on the reflected light path can irradiate on an object located on the reflected light path. In one example, the light-absorbing unit 131 is a black grid, and the light-reflecting unit 132 is a white grid. The materials of the light-absorbing unit 131 and the light-reflecting unit 132 can be specifically determined according to the actual situation and are not limited herein. In one example, the light-absorbing unit 131 is a black piece of paper, and the light-reflecting unit 132 is a white piece of paper.

[0037] The light-emitting circuit 140 can emit light of a certain wavelength, and the light emitted by the light-emitting circuit 140 can irradiate the light-absorbing unit 131 and the light-reflecting unit 132. The light-emitting circuit 140 can include light-emitting diodes, and the light-emitting diodes can emit light of a certain wavelength. The grid member 130 is located on the optical path of the light emitted by the light-emitting circuit 140, and the detection circuit 150 is located on the optical path of the light reflected by the grid member 130. That is to say, if the grid member 130 reflects light, the emitted light will irradiate on the detection circuit 150. When no light irradiates on the detection circuit 150, the detection circuit 150 generates a first level signal, and when light irradiates on the detection circuit 150, the detection circuit 150 generates a second level signal. The first level signal and the second level signal are different level signals. In one example, the first level signal is a high level signal and the second level signal is a low level signal, or the first level signal is a low level signal and the second level signal is a high level signal. Specifically, it can be set based on the actual situation.

[0038] As Figure 2 shown, the light-absorbing unit 131 and the light-reflecting unit 132 are alternately arranged in the lifting direction of the lifting rod 120. When light irradiates on the light-absorbing unit 131, the light-absorbing unit 131 is used to absorb the light. At this time, no light irradiates on the detection circuit 150, and the detection circuit 150 generates a first level signal. When light irradiates on the light-reflecting unit 132, the light-reflecting unit 132 is used to reflect the light, and the light reflected by the reflecting unit 132 irradiates on the detection circuit 150, and the detection circuit 150 generates a second level signal based on the light.

[0039] The heights of the light-absorbing unit 131 and the light-reflecting unit 132 in the lifting direction can be set based on the actual situation. For example, in order to facilitate the calculation of the moving distance of the lifting rod, the height of the light-absorbing unit 131 in the lifting direction can be a preset n times of the movement of the lifting rod 120 once, n>0, and the height of the light-reflecting unit 132 in the lifting direction can be a preset m times of the movement of the lifting rod 120 once, m>0.

[0040] In one example, the height of the light-absorbing unit 131 in the lifting direction is equal to the size of the light-reflecting unit 132 in the lifting direction. Exemplarily, if the light emitted by the current light-emitting circuit 140 irradiates on the light-absorbing unit 131, since the light-absorbing unit absorbs the light, no light irradiates on the detection circuit 150 at this time, and the detection circuit 150 generates a first level signal. If the motor drives the lifting rod to move one step, the grid member 130 also moves one grid, and the height of one grid is the size of the light-absorbing unit 131 and the light-reflecting unit 132 in the lifting direction. The light emitted by the light-emitting circuit 140 irradiates on the light-reflecting unit 132, and the light-reflecting unit 132 is used to reflect the light, and the light reflected by the reflecting unit 132 irradiates on the detection circuit 150, and the detection circuit 150 generates a second level signal based on the light.

[0041] The detection circuit 150 is electrically connected to the controller 160 , and the detection circuit 150 can send the generated level signal to the controller 160 .

[0042] The controller 160 is electrically connected to the motor 110. The controller 160 determines the direction of each lift rod movement and calculates the distance the lift rod moves based on the voltage level signal sent to the controller by the detection circuit. The controller 160 can determine the direction of each lift rod movement in various ways. For example, the controller 160 can send a lift rod raising / lowering instruction to the motor. In this case, the controller 160 itself can determine the direction of each lift rod movement. Alternatively, the controller 160 can determine the direction of each lift rod movement by detecting a voltage signal from the motor.

[0043] In one example, the controller 160 is electrically connected to the motor 110, and the controller 160 can control the motor 110 to drive the lifting rod up or down. For example, the controller 160 receives a lifting command sent by the user and controls the operation of the motor based on the lifting command. In one example, if the user requests the lifting rod to rise, the controller 160 controls the motor 110 to drive the lifting rod up. If the user requests the lifting rod to lower, the controller 160 controls the motor 110 to drive the lifting rod down. The lifting and lowering commands can be sent by the controller, that is, the controller can always know whether the lifting rod is rising or lowering.

[0044] The controller can record identification information each time the lifting rod rises or falls, and then calculate the distance the lifting rod moves based on the level signal sent to the controller by the detection circuit.

[0045] In one example, the motor can be a DC motor. The controller sends an upward movement instruction to the motor, marking the upward movement of the lifting rod. After the grid moves, the detection circuit generates different level signals, and the controller calculates the distance the lifting rod has moved upward based on the received level signals. The controller sends a downward movement instruction to the motor, marking the downward movement of the lifting rod. After the grid moves, the detection circuit generates different level signals, and the controller calculates the distance the lifting rod has moved downward based on the received level signals. If the controller controls the motor to move up and down repeatedly, the position of the lifting rod can be determined based on the historical information indicating whether the lifting rod has risen or fallen. DC motors are less expensive than stepper motors, and using DC motors can reduce costs.

[0046] In one example, mark the initial position of the lifting rod. After each lifting instruction sent by the controller, record the identification information of the current lifting of the lifting rod. Then, before receiving the next lifting instruction sent by the controller, obtain the level signal received by the controller. Based on the current lifting instruction sent by the controller and the received level signal, calculate the moving distance of the lifting rod. Then, according to the moving distance of the lifting rod each time subsequently, calculate the current distance of the lifting rod.

[0047] In one example, the controller 160 can also determine the moving direction of the lifting rod each time based on the signal output by the motor. The controller 160 can detect the output voltage value of the motor 110. For example, when the output voltage of the motor 110 is set to be positive, it indicates that the voltage is in the forward rotation, and it is determined that the lifting rod 120 moves downward; when the output voltage of the motor 110 is negative, it indicates that the voltage is in the reverse rotation, and it is determined that the lifting rod 120 moves upward. Or, when the output voltage of the motor 110 is set to be positive, it indicates that the voltage is in the forward rotation, and it is determined that the lifting rod 120 moves upward; when the output voltage of the motor 110 is negative, it indicates that the voltage is in the reverse rotation, and it is determined that the lifting rod 120 moves downward, and so on. The corresponding relationship between the positive and negative of the voltage detected by the controller 160 and the upward or downward movement of the lifting rod 1 can be set based on the actual situation and is not limited here.

[0048] The detection circuit is arranged on the reflected light path of the grid member. The grid member includes a plurality of light-absorbing units and a plurality of light-reflecting units arranged alternately in the lifting direction. If there is light reflection from the grid member, the emitted light will irradiate on the detection circuit. When there is no light irradiating on the detection circuit, the detection circuit generates a first level signal. When there is light irradiating on the detection circuit, the detection circuit generates a second level signal, so that the detection circuit generates different level signals during the lifting of the lifting rod. The controller can determine whether the lifting rod is rising or falling. The controller can accurately calculate the moving distance of the lifting rod based on the lifting direction of the lifting rod and the level signal of the detection module, and then can accurately control the height of the lifting rod.

[0049] In one possible embodiment, the light-absorbing unit 131 and the light-reflecting unit 132 have the same size in the lifting direction.

[0050] The light-absorbing unit 131 and the light-reflecting unit 132 having the same size in the lifting direction can make it more convenient for the controller to calculate the moving distance of the lifting rod.

[0051] The light-absorbing unit 131 and the light-reflecting unit 132 can be structures of any shape. In one possible embodiment, both the light-absorbing unit 131 and the light-reflecting unit 132 are rectangular structures. The rectangular structure has simple technology and low cost.

[0052] In one possible embodiment, the sizes of the light-absorbing unit 131 and the light-reflecting unit 132 in the lifting direction are 1 cm.

[0053] The dimensions of the light absorption unit 131 and the light reflection unit 132 in the lifting direction are equidistant by 1 cm. If the lifting rod moves in one direction all the time, for example, if the lifting rod moves downward, and if the controller receives 5 first-level voltages and 5 second-level voltages, it means that the lifting rod has moved downward by (5 + 5)×1 cm = 10 cm.

[0054] In a possible embodiment, the light absorption unit 131 is a black grid, and the light reflection unit 132 is a white grid.

[0055] The black grid can absorb light, and the white grid can reflect light. Using the black grid and white grid has a simple structure and saves costs.

[0056] In a possible embodiment, the light-emitting circuit 140 includes a first power supply, a first capacitor, and a light-emitting unit;

[0057] The first end of the first capacitor is respectively connected to the first power supply and the anode of the light-emitting unit, and the second end of the first capacitor is grounded;

[0058] The cathode of the light-emitting unit is grounded.

[0059] The first power supply can be 3.3V, 5.7V, etc., and can be specifically determined based on the actual situation.

[0060] In an example, the first power supply is provided by a device using the lifting structure. For example, if a lawn mower applies the lifting structure, the first power supply can be a regulated power supply generated by the power supply module on the lawn mower.

[0061] The first capacitor is a power supply filtering capacitor, making the direct current output by the first power supply smoother.

[0062] In a possible embodiment, the light-emitting unit is a light-emitting diode.

[0063] The light-emitting diode can emit light of a certain wavelength. By applying an electrical signal to the light-emitting diode, the light-emitting diode can emit light.

[0064] In a possible embodiment, the detection circuit 150 includes a second power supply, a resistor, and a light-receiving unit;

[0065] The first end of the light-receiving unit is grounded, the second end of the light-receiving unit is respectively connected to the first end of the resistor and the controller 160, and the second end of the resistor is connected to the second power supply.

[0066] The size of the resistor can be determined based on the actual situation. The second power supply can be 3.3V, 5.7V, etc., and can be specifically determined based on the actual situation.

[0067] In one example, the second power supply is provided by a device using a lifting structure. For example, in a lawn mower application where a lifting structure is used, the second power supply can be a regulated power supply generated by a power supply module on the lawn mower.

[0068] The light-receiving unit is any light-sensitive component whose resistance value can change with the intensity of external light. After the light-receiving unit senses light, its resistance becomes smaller, and at this time, the level signal sent to the controller 160 is a low-level signal. When the light-receiving unit does not sense light and its resistance becomes larger, the level signal sent to the controller 160 at this time is a high-level signal. Based on the different level signals received, the controller 160 can determine whether the lifting structure has moved.

[0069] In one possible embodiment, the light-receiving unit is a photosensitive diode.

[0070] The light-receiving unit can be a photoresistor or a photosensitive diode. As a light-sensitive component, the resistance value of the photosensitive diode can change with the intensity of external light.

[0071] Based on the above embodiments, refer to Figure 3 , Figure 3 where both the first power supply and the second power supply are regulated power supplies of 3.3V. R1 is a resistor. C1 is the first capacitor, L1 is a light-emitting diode, M1 is a photosensitive diode, and GND is the ground wire.

[0072] The 3.3V power supply continuously powers L1, and L1 continuously emits light. When the light emitted by L1 irradiates on the light-absorbing unit 131, since the light-absorbing unit absorbs the light, at this time, no light irradiates on the detection circuit 150, that is, the photosensitive diode does not receive light. At this time, the photosensitive diode is not conducting, and R1 pulls up the voltage at point C to 3.3V, sending a high-level signal to the controller. The light emitted by the light-emitting circuit 140 irradiates on the light-reflecting unit 132. The light-reflecting unit 132 is used to reflect light. The light reflected by the reflecting unit 132 irradiates on the detection circuit 150, that is, the photosensitive diode receives light. At this time, the photosensitive diode conducts, the voltage at point C is 0, and a low-level signal is sent to the controller, so that the controller calculates the moving distance of the lifting rod based on the received high and low levels. The above circuit is simple and can accurately calculate the moving distance of the lifting rod.

[0073] A lawn mower, also known as a weed cutter, grass shearer, lawn trimmer, etc., is a mechanical tool used for trimming lawns, vegetation, etc. A lawn mower may include a frame, a cutter deck, a traveling structure, a handle, etc. The cutter deck, the traveling structure, and the handle are arranged on the frame. The traveling structure can be installed at the bottom of the frame, and the cutter deck can also be arranged at the bottom of the frame. The lawn mower realizes the trimming of the lawn and vegetation through the cutting tools on the cutter deck. Generally, an installation part is provided on the cutter deck of the lawn mower, and the cutting tools are detachably installed on the cutter deck through connecting pieces, which is specifically set based on the actual situation and will not be limited here.

[0074] When the lawn mower is working, there are certain requirements for the height of the cutter deck. For example, when mowing the lawn, if the height of the cutter deck is set too low, it may rub against the ground, resulting in the inability to mow the grass, or it may be difficult to mow when the grass roots are too dense, or on some pitted lawns or sloping ground, the machine may not be able to pass normally; if the height of the cutter deck is set too high, there will be no mowing effect. Therefore, for different lawn scenarios, the user needs to set the height of the cutter deck of the lawn mower one by one so that the lawn mower can handle different lawn scenarios.

[0075] As Figure 4 shown, an embodiment of the present invention further provides a lawn mower, including: the lifting structure 410 and the cutter deck 420 described in any one of the above;

[0076] The cutter deck includes at least one cutting tool; the cutter deck is fixedly arranged on the lifting rod.

[0077] A lawn mower may include at least one cutter deck. For each cutter deck, the cutter deck may include at least one cutting tool, and the cutting tools may be of the same model or different models, which can be specifically set based on the actual situation.

[0078] In a possible embodiment, a cutter deck frame is included on the lawn mower, and the cutter deck is installed on the cutter deck frame. Exemplarily, when there are multiple cutter decks, the cutter decks can also be installed side by side on the cutter deck frame. The cutter deck has a locked state and a disassembled state. In the locked state, the cutter deck is limited in the cutter deck frame; in the disassembled state, the cutter deck can be disassembled from the cutter deck frame. Similarly, the cutting tool has a locked state and a disassembled state. In the locked state, the cutting tool is limited in the cutter deck; in the disassembled state, the cutting tool can be disassembled from the cutter deck.

[0079] As Figure 5 shown, Figure 5It is a schematic structural diagram of a lawn mower. The cutter head is fixedly installed on the lifting rod. When the motor drives the lifting rod to move, the lifting rod drives the cutter head and the grid member to move together. That is to say, the distance that the cutter head moves each time is the same as the distance that the lifting rod moves. Because the detection circuit on the lifting rod is arranged on the reflection light path of the grid member, the grid member includes a plurality of light-absorbing units and a plurality of light-reflecting units arranged alternately in the lifting direction. If the grid member reflects light, the emitted light will irradiate on the detection circuit, as shown in the figure. Figure 6 It is a schematic diagram of a light-emitting circuit, a detection circuit and a grid member. The light emitted by the light-emitting circuit is reflected by the light-reflecting unit to the detection circuit. When no light irradiates on the detection circuit, the detection circuit generates a first level signal. When light irradiates on the detection circuit, the detection circuit generates a second level signal, so that the detection circuit generates different level signals during the lifting and lowering of the lifting rod. The controller can determine whether the lifting rod is rising or falling. Based on the lifting direction of the lifting rod and the level signal of the detection module, the controller can accurately calculate the distance that the lifting rod moves, and then can accurately control the height of the lifting rod. After determining the distance that the lifting rod moves, the distance that the cutter head moves can be directly determined, so that the distance that the cutter head moves can be accurately determined.

[0080] In a possible embodiment, the lawn mower further includes a dust-proof cover. The dust-proof cover is used to seal the grid member, preventing substances such as grass clippings, dust, and stones from entering the interior of the lawn mower and damaging the grid member. The service life of the lifting structure of the lawn mower can be extended through the dust-proof cover, ensuring the stability and reliability of the lawn mower during operation.

[0081] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A lifting structure, characterized in that, Comprising: A motor, a lifting rod, a grid member, a lighting circuit, a detection circuit, and a controller; the grid member includes a plurality of light-absorbing units and a plurality of light-reflecting units, and the light-absorbing units and the light-reflecting units are alternately arranged in the lifting direction of the lifting rod. The grid member is fixedly arranged on the lifting rod, and the lifting rod is in transmission connection with the motor; the controller is electrically connected to the detection circuit and the motor respectively. The detection circuit is arranged on the reflected light path of the grid member, wherein the reflected light path is the light path formed by the light-reflecting unit in the grid member reflecting the light of the lighting circuit.

2. The lifting structure according to claim 1, wherein The light-absorbing unit and the light-reflecting unit have the same size in the lifting direction.

3. The lifting structure according to claim 1, characterized in that Both the light-absorbing unit and the light-reflecting unit are rectangular structures.

4. The lifting structure according to claim 2, wherein The size of the light-absorbing unit and the light-reflecting unit in the lifting direction is 1 cm.

5. The lifting structure according to claim 1, characterized in that, The light-absorbing unit is a black grid, and the light-reflecting unit is a white grid.

6. The lifting structure according to claim 1, characterized in that, The lighting circuit includes a first power supply, a first capacitor, and a lighting unit. The first end of the first capacitor is connected to the first power supply and the anode of the lighting unit respectively, and the second end of the first capacitor is grounded. The cathode of the lighting unit is grounded.

7. The lifting structure according to claim 6, wherein The lighting unit is a light-emitting diode.

8. The lifting structure according to claim 1, characterized in that, The detection circuit includes a second power supply, a resistor, and a light-receiving unit. The first end of the light-receiving unit is grounded, and the second end of the light-receiving unit is connected to the first end of the resistor and the controller respectively; the second end of the resistor is connected to the second power supply.

9. The lifting structure according to claim 8, characterized in that, The light-receiving unit is a photodiode.

10. A lawn mower, characterized in that, Comprising: The lifting structure and the cutter head according to any one of claims 1 to 9 above; The cutter head includes at least one cutter; the cutter head is fixedly arranged on the lifting rod.

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