WO2024065167A1

WO2024065167A1 - Automatic lifting mowing module and mower

Info

Publication number: WO2024065167A1
Application number: PCT/CN2022/121675
Authority: WO
Inventors: 黄阳; 朱涛涛; 田安洋; 陈泽纯
Original assignee: 深圳汉阳科技有限公司
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2024-04-04

Abstract

Disclosed in the present application are an automatic lifting mowing module and a mower. The automatic lifting mowing module comprises a fixing frame comprising a fixing plate; a cutter head assembly, which is arranged on the fixing frame; a first mounting member, which is arranged on one side of the fixing plate; a guide column, on which the fixing plate is sleeved and which has one end fixedly connected to the first mounting member; an electric motor, which is fixedly mounted on one side of the first mounting member; and a lead screw, which is parallel to the guide column, wherein the fixing plate is provided with a thread hole, the lead screw is in thread fit with the thread hole, and the electric motor can drive the lead screw to rotate. By means of the technical solution of the present application, automatic stepless adjustment of the height of the mowing module is achieved.

Description

Automatic lifting mowing module and mower

Technical Field

The present application relates to the technical field of lawn mowing machinery, and in particular to an automatic lifting lawn mowing module and a lawn mower.

Background technique

A lawn mower has the purpose of mowing lawns, etc. Different lawns require different grass heights, so when mowing the lawn, the grass needs to be mowed to an appropriate height.

technical problem

The mowing module of a traditional lawn mower has only a few preset heights to choose from, which makes it difficult to adapt to the height requirements between the preset heights and is unable to achieve stepless adjustment of the mowing height.

Technical Solutions

The technical solution of the present application realizes automatic stepless adjustment of the height of the mowing module by adopting the method of using the motor to drive the screw rod. The relative positions of the motor, the first mounting member and the screw rod are unchanged, forming a stable frame structure. The fixed plate is sleeved on the guide column, so it can slide along the guide column. When the motor does not drive the screw rod to rotate, the screw rod is fixed and does not rotate. At this time, since the screw rod and the fixed plate are threadedly matched through the threaded hole, the fixed plate cannot move at this time. When the motor drives the threaded rod to rotate, the fixed plate can slide along the guide column. The fixed plate is part of the fixed frame, so the fixed frame can also slide along the guide column. Since the rotation of the motor is continuous, the position of the fixed frame on the guide column can be continuously adjusted, thereby realizing automatic stepless adjustment of the height of the mowing module.

Beneficial Effects

The automatic stepless adjustment of the height of the mowing module is realized.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

FIG1 is a schematic structural diagram of an embodiment of an automatic lifting mowing module of the present application;

FIG2 is a partial exploded view of the embodiment of the automatic lifting mowing module of FIG1 of the present application;

FIG3 is an exploded view of a cutter head assembly of the embodiment of the automatic lifting mowing module of FIG1 of the present application;

FIG. 4 is another partial exploded view of the embodiment of the automatic lifting mowing module in FIG. 1 of the present application.

Description of Figure Numbers:

标号 Label	名称 Name	标号 Label	名称 Name
10 10	固定架 Fixed bracket	72 72	刀盘 Cutter
11 11	固定板 Fixed plate	73 73	刀片 Blades
12 12	直线轴承 Linear Bearings	74 74	草梳 Grass comb
13 13	螺纹孔 Threaded hole	75 75	草梳支架 Grass comb stand
20 20	第一安装件 First installation part	76 76	安装筒 Installation tube
30 30	第二安装件 Second mounting piece	77 77	驱动轴 Drive shaft
40 40	导向柱 Guide column	80 80	传感器支架 Sensor bracket
50 50	电机 Motor	81 81	上光电门传感器 Upper photoelectric gate sensor
60 60	丝杆 Screw rod	82 82	下光电门传感器 Lower photoelectric gate sensor
70 70	刀头组件 Cutter head assembly	83 83	遮光片 Shade film
71 71	驱动电机 motor	90 90	减速机 Reducer

Embodiments of the present application

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

It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

The present application proposes an automatic lifting mowing module.

In the embodiment of the present application, referring to FIG. 1 and FIG. 2 , the automatic lifting and mowing module includes:

A fixing frame 10, the fixing frame 10 includes a fixing plate 11;

The cutter head assembly 70 is arranged on the fixing frame 10;

A first mounting member 20, which is disposed on one side of the fixing plate 11;

A guide column 40, wherein the fixing plate 11 is sleeved on the guide column 40, and one end of the guide column 40 is fixedly connected to the first mounting member 20;

A motor 50, which is fixedly mounted on one side of the first mounting member 20; and

The screw rod 60 is parallel to the guide column 40 , and a threaded hole 13 is provided on the fixing plate 11 . The screw rod 60 is threadedly matched with the threaded hole 13 , and the motor 50 can drive the screw rod 60 to rotate.

When the automatic lifting mowing module is in use, a whole composed of the first mounting member 20, the second mounting member 30, the guide column 40 and the motor 50 can be fixedly connected to a certain part of the mower. When in use, the above whole will be at a certain height. At this time, the motor 50 drives the screw rod 60 to rotate, and the screw rod 60 drives the fixed plate 11 to move up and down along the length direction of the guide column 40, thereby driving the fixed frame 10 to move. Some mowing tools, such as saw blades, shearing structures, etc., can be set on the fixed frame 10. When the motor 50 drives the fixed frame 10 to move, the mowing tools on the fixed frame 10 will also move up and down, so that the adjustment of the mowing height is achieved. The motor 50 can be a servo motor 50 or a stepping motor 50, etc., which can accurately adjust its rotation angle, and can be fixed in a certain rotation state after rotation. The mowing height can be automatically and continuously adjusted by setting it in this way. It is particularly important to note that if there is only one guide post 40, the fixed plate 11 can still rotate along the guide post 40, but due to the existence of the screw rod 60, the fixed plate 11 cannot rotate, but can only slide along the length direction of the guide post 40, so the screw rod 60 also has a positioning function. At the same time, if there is only the screw rod 60 without the guide post 40, the fixed plate 11 may rotate due to the friction between the screw rod 60 and the threaded hole 13, and thus cannot move up and down along the length direction of the screw rod 60, so the guide post 40 also has the function of assisting the screw rod 60 in controlling the height of the fixed plate 11.

Referring to FIG. 1 and FIG. 2 , optionally, there are multiple guide posts 40, and the multiple guide posts 40 are distributed at intervals along the circumference of the screw rod 60. The same principle as the above-mentioned one guide post 40 and the screw rod 60 cooperate to control the movement of the fixed plate 11. If there are two guide posts 40, the fixed plate 11 can be controlled to move only along the length direction of the guide post 40. At this time, the screw rod 60 only needs to control the height of the fixed plate 11, and does not need to play a positioning role, which reduces the force on the screw rod 60. When mowing, there is an interaction force between the mowing module and the grass, and sometimes the rock or soil may be accidentally cut due to the protrusion of the lawn, so multiple guide posts 40 can be set to disperse the impact force on the mowing module and prevent damage to the mowing module.

Referring to FIG. 1 and FIG. 2 , the automatic lifting mowing module further includes a second mounting member 30; one end of the guide column 40 away from the first mounting member 20 is fixedly connected to the second mounting member 30. Both the first mounting member 20 and the second mounting member 30 can be set as a plate-like structure. The first mounting member 20 and the second mounting member 30 fix the guide column 40 from both sides, so that the guide column 40 is more stable and more conducive to the guide column 40 guiding the fixing plate 11.

Referring to Figures 1 and 2, further, the automatic lifting mowing module also includes a reducer 90, which is fixedly connected to the first mounting member 20, and the output shaft of the motor 50 is connected to the input end of the reducer 90, and the output end of the reducer 90 is connected to the screw rod 60, and the motor 50 drives the screw rod 60 to rotate through the reducer 90. The reducer 90 is a common device in the mechanical field, and the principle is not repeated. The reducer 90 can amplify the torque of the motor 50, which is more conducive to driving the screw rod 60 to rotate. The reducer 90 can reduce the speed of the screw rod 60, which is conducive to accurately adjusting the angle of rotation of the screw rod 60, and then accurately controlling the height of the fixed plate 11 to achieve accurate adjustment of the mowing height. The reducer 90 can also have a self-locking structure inside, that is, the input end of the reducer 90 can drive the output end to rotate, while the output end cannot drive the input end to rotate. After such a setting, the motor 50 can be set as an ordinary motor, and when the screw rod 60 needs to be driven to rotate, the motor 50 is rotated; when the screw rod 60 needs to be fixed, the motor 50 is turned off, and the screw rod 60 is fixed by the self-locking ability of the reducer 90. When the reducer 90 is not provided, the motor 50 can directly drive the screw rod 60 to rotate. In this case, the motor 50 can be provided as a servo motor.

Referring to Figures 1, 2 and 4, optionally, a linear bearing 12 is provided at the socket of the guide column 40 and the fixed plate 11. The linear bearing 12 can reduce the friction between the fixed plate 11 and the guide column 40 when the fixed plate 11 slides along the length direction of the guide column 40. At the same time, the bearing has high hardness and is wear-resistant, which allows the guide column 40 to maintain a tight socket with the fixed plate 11 during a longer service life, and prevents abnormal shaking caused by the expansion of the socket hole due to wear. In addition, the bearing is easy to replace. If the bearing is damaged due to long-term friction, it is sufficient to replace the bearing without replacing the guide column 40 and the fixed plate 11, which is conducive to later maintenance.

With reference to FIG. 1 and FIG. 3 , optionally, the cutter head assembly 70 includes:

A driving motor 71, wherein the driving motor 71 is fixed on the fixing frame 10;

a cutter disc 72, which is connected to the output shaft of the driving motor 71 and can be driven to rotate by the driving motor 71; and

The blade 73 is detachably connected to the blade disc 72 .

Since the driving motor 71 is fixed on the fixing frame 10, the height of the driving motor 71 will change with the height of the fixing frame 10. The height of the fixing frame 10 changes with the height of the fixing plate 11. The height of the fixing plate 11 is controlled by the motor 50 and the screw rod 60, so the motor 50 can control the height of the driving motor 71. The cutter disc 72 is connected to the driving motor 71, so the height of the cutter disc 72 can also be adjusted by the motor 50. When it is necessary to mow the grass, the cutter disc 72 is first adjusted to an appropriate height by the motor 50 and the screw rod 60, and then the driving motor 71 drives the cutter disc 72 to rotate, and the cutter disc 72 drives the blade 73 to rotate, so that the grass can be cut. The blade 73 is a consumable part, because continuous cutting of the grass will make it passivated, so a detachable connection is used to connect the blade 73 to the cutter disc 72. The disassembly and connection of the blade 73 belongs to the prior art and will not be repeated here.

Referring to FIG. 1 and FIG. 3 , optionally, there are at least two cutter head assemblies 70. Multiple cutter head assemblies 70 are fixed on the fixing frame 10. When mowing is required, the blade discs 72 of multiple cutter head assemblies 70 can be driven to rotate at the same time to mow the grass at the same time, thereby improving the efficiency of mowing. The provision of multiple cutter head assemblies 70 can also prevent the complete failure of the mowing module due to damage of some cutter head assemblies 70, because the remaining cutter head assemblies 70 can continue to realize the function of mowing.

With reference to Fig. 1 and Fig. 3, the cutter head assembly 70 may further include a grass comb 74, which is fixed on the fixed frame 10 and extends to the side of the blade 73 away from the cutter disc 72, and the grass comb 74 has a grid-like structure on the side close to the blade 73. The length direction of the grid plate of the grid-like structure may be oriented in the direction of pushing the lawn mower, so that the grass comb 74 of the grid-like structure can arrange the arrangement direction of the grass. In reality, the growth direction of the grass is arbitrary, and some grass may bend toward the ground during the growth process, causing the blade 73 to pass through such grass, and such grass reduces the cutting force of the blade 73 by further bending toward the ground, thereby making it difficult for the blade 73 to cut such grass. However, after the lawn mower is pushed over, such grass returns to its initial state, which is higher than the required lawn height. The grass comb 74 is located on the side of the blade 73 close to the ground, and such grass comb 74 can be raised so that it cannot bend toward the ground, thereby improving the effect of mowing.

Referring to Fig. 1 and Fig. 3, the cutter head assembly 70 may further include a grass combing bracket 75, a mounting tube 76 and a driving shaft 77. The mounting tube 76 is fixedly connected to the fixed frame 10, and the output shaft of the driving motor 71 is connected to the driving shaft 77 and can drive the driving shaft 77 to rotate; the driving shaft 77 is inserted into the mounting tube 76, and the driving shaft 77 is connected to the blade disc 72 and can drive the blade disc 72 to rotate; the grass combing bracket 75 is fixedly installed on the mounting tube 76, and the grass combing bracket 75 is connected to the grass comb 74. After the mounting tube 76 is fixed to the fixed frame 10, the grass combing bracket 75 is connected to the mounting tube 76, and the grass comb 74 is connected to the grass combing bracket 75, so that the grass comb 74 can follow the fixed frame 10 to move along the direction of the guide column 40, maintain the relative position of the grass comb 74 and the blade disc 72, and make the grass comb 74 have a better grass combing effect. The driving shaft 77 is inserted into the mounting tube 76, which can provide certain protection for the driving shaft 77.

Referring to Fig. 3, the blade 73 is optionally connected to the cutter head 72 by screws. Screw connection is a common connection method. Screws are easy to obtain and easy to disassemble, so the blade 73 is convenient for disassembly and installation of the blade 73 by using this connection method.

Referring to FIG. 1 , optionally, the automatic lifting and mowing module further includes a sensor bracket 80, which is fixed on the first mounting member 20. The sensor bracket 80 has a sensor, which can sense whether the position of the fixed plate 11 is at a preset limit position. The sensor can be a reed sensor, and in FIG. 1 , 81 and 82 can be the reed bodies of the reed sensor, and 83 can be the magnet of the reed sensor. The magnet is fixed on the fixed plate 11, so it moves with the fixed plate 11. When the fixed plate 11 moves to the preset lower limit position, the magnet acts on the sensor 82, triggering 82 to send a signal, so that the control system knows that the fixed plate 11 is at the lower limit position, stops the motor 50, and avoids damage to the mowing module; when the fixed plate 11 moves to the preset upper limit position, the magnet acts on the sensor 81, triggering 81 to send a signal, so that the control system knows that the fixed plate 11 is at the upper limit position, stops the motor 50, and avoids damage to the mowing module. When the automatic lifting and mowing module also has a second mounting member 30, the sensor bracket 80 can also be fixed on the second mounting member 30 at the same time to make the sensor bracket 80 more stable.

Referring to FIG1 , optionally, the sensor is a photoelectric gate sensor, and includes an upper photoelectric gate sensor 81 and a lower photoelectric gate sensor 82. A light shielding sheet 83 is provided on the fixed plate 11. When the fixed plate 11 moves to the limit position, the light shielding sheet 83 will trigger the upper photoelectric gate or the lower photoelectric gate. The function is similar to the above-mentioned reed sensor. As shown in FIG1 , when the fixed plate 11 moves to the lower limit position, the light shielding sheet 83 shields the light emitted by the lower photoelectric gate sensor 82, so that the lower photoelectric gate sensor 82 is triggered, and a signal is sent to inform the control system that the fixed plate 11 is at the lower limit position, and the control system stops the motor 50 to prevent the mowing module from being damaged; when the fixed plate 11 moves to the upper limit position, the light shielding sheet 83 shields the light emitted by the upper photoelectric gate sensor 81, so that the upper photoelectric gate sensor 81 is triggered, and a signal is sent to inform the control system that the fixed plate 11 is at the upper limit position, and the control system stops the motor 50 to prevent the mowing module from being damaged. The photoelectric gate sensor reacts quickly, which is beneficial to the protection of the mowing module.

The present application also proposes a lawn mower, which includes a lawn mower body and an automatic lifting mowing module. The specific structure of the automatic lifting mowing module refers to the above embodiment. Since the lawn mower adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the first mounting part, the second mounting part, the guide column and the motor of the automatic lifting mowing module form a whole, which can be fixedly connected to a certain part of the lawn mower. The lawn mower can be electrically connected to the motor and the drive motor, supply power to the motor and the drive motor, and control their rotation.

The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the inventive concept of the present application, or directly/indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

An automatic lifting mowing module, characterized by comprising:

A fixing frame, the fixing frame comprising a fixing plate;

A cutter head assembly, arranged on the fixing frame;

a first mounting member, the first mounting member being arranged on one side of the fixing plate;

A guide column, the fixing plate is sleeved on the guide column, and one end of the guide column is fixedly connected to the first mounting member;

a motor, the motor being fixedly mounted on one side of the first mounting member; and

The screw rod is parallel to the guide column, the fixing plate is provided with a threaded hole, the screw rod is threadedly matched with the threaded hole, and the motor can drive the screw rod to rotate.
The automatic lifting mowing module as described in claim 1 is characterized in that there are multiple guide columns, and the multiple guide columns are distributed at intervals along the circumference of the screw rod.
The automatic lifting mowing module as described in claim 1 is characterized in that the automatic lifting mowing module also includes a second mounting member; and one end of the guide column away from the first mounting member is fixedly connected to the second mounting member.
The automatic lifting and mowing module as described in claim 1 is characterized in that the automatic lifting and mowing module also includes a reducer, the reducer is fixedly connected to the first mounting member, the output shaft of the motor is connected to the input end of the reducer, the output end of the reducer is connected to the screw rod, and the motor drives the screw rod to rotate through the reducer.
The automatic lifting mowing module according to claim 1 is characterized in that a linear bearing is provided at the sleeve joint between the guide column and the fixed plate.
The automatic lifting mowing module according to claim 1, characterized in that the cutter head assembly comprises:

A driving motor, wherein the driving motor is fixed on the fixing frame;

a cutter disc, the cutter disc being connected to the output shaft of the drive motor and being driven to rotate by the drive motor; and

A blade is detachably connected to the blade disc.
The automatic lifting mowing module as described in claim 6 is characterized in that there are at least two cutter head assemblies.
The automatic lifting mowing module as described in claim 6 is characterized in that the cutter head assembly also includes a grass comb, which is fixed to the fixed frame and extends to a side of the blade away from the cutter disc, and the grass comb has a grid-like structure on a side close to the blade.
The automatic lifting mowing module as described in claim 8 is characterized in that the cutter head assembly also includes a grass comb bracket, a mounting tube and a drive shaft, the mounting tube is fixedly connected to the fixed frame, the output shaft of the drive motor is connected to the drive shaft and can drive the drive shaft to rotate; the drive shaft is passed through the mounting tube, the drive shaft is connected to the blade disc and can drive the blade disc to rotate; the grass comb bracket is fixedly mounted on the mounting tube, and the grass comb bracket is connected to the grass comb.
The automatic lifting mowing module as described in claim 6 is characterized in that the blade is connected to the cutter disc by screws.
The automatic lifting and mowing module as described in claim 1 is characterized in that the automatic lifting and mowing module also includes a sensor bracket, the sensor bracket is fixed on the first mounting member, and a sensor is provided on the sensor bracket, and the sensor can sense whether the position of the fixing plate is at a preset extreme position.
The automatic lifting mowing module as described in claim 11 is characterized in that the sensor is a photoelectric gate sensor, and includes an upper photoelectric gate sensor and a lower photoelectric gate sensor, and a shading sheet is provided on the fixed plate. When the fixed plate moves to the extreme position, the shading sheet triggers the upper photoelectric gate or the lower photoelectric gate.
A lawn mower, characterized in that the lawn mower comprises the automatic lifting mowing module according to any one of claims 1 to 12.