Miniature rotary cultivator with in-situ starting prevention protection device

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Through the mechanical start protection device, gravity sensing and electromagnetic self-locking are used to ensure that the rotary till wheel can only be started after being suspended, which solves the problem of overload and damage to the motor of the micro rotary tiller, and achieves low cost, high reliability and low power consumption protection effects.

CN120476705AInactive Publication Date: 2025-08-15ANHUI ZHENGYU GRAIN MASCH TECH CO LTD

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Patent Information

Application Number: CN202510933383.6
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2025-07-08
Publication Date: 2025-08-15
Estimated Expiration: Not applicable · inactive patent

AI Technical Summary

Technical Problem

When a traditional micro rotary tiller is started directly in a horizontal parked state, the contact between the rotary tiller and the soil causes the motor to be overloaded and burned, lacking an effective protection mechanism and existing high-end solutions are expensive and complex, and are not suitable for the lightweight and low power consumption requirements of micro-equipment.

Method used

The mechanical start protection device triggered by gravity induction is adopted. The rolling balls in the inclined shell and the small hand-crank generator set is used to absorb the magnetic suction block, so that the inclination angle of the machine base is determined purely by mechanically, ensuring that the rotary till wheel can only be started after it is suspended, and combining with the mechanical conductive paths to ensure the circuit is on and off to avoid motor overload.

Benefits of technology

It realizes automatic reset and lubrication without additional energy input, reduces the failure rate by more than 80%, and the cost is only 1/5 of the sensor solution, adapts to harsh farmland environments and reduces the risk of equipment damage.

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Abstract

The invention relates to a miniature rotary cultivator with an in-situ starting prevention protection device, which comprises a machine base, a walking wheel rotationally arranged at the bottom of the machine base, a protective cover fixed on the left side of the machine base and a rotary tillage wheel driven by a driving shaft in an inner cavity of the protective cover, a control switch used for controlling the rotary tillage wheel to start the motor is arranged on a handle of the rack. The invention relates to the technical field of agricultural machinery. According to the mini-type rotary cultivator with the in-situ starting prevention protection device, through three innovations of gravity induction triggering, power generation self-locking and mechanical electric conduction, forced protection of arm lifting starting of the mini-type rotary cultivator is achieved through an extremely simple structure. Compared with the traditional scheme, the system has the characteristics of zero standby power consumption, severe environment resistance, low cost and high reliability, is particularly suitable for popularization and application of small agricultural machinery, and greatly reduces the risk of equipment damage caused by misoperation.

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Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, in particular to a miniature rotary tiller with an anti-in-situ start-up protection device. Background Art

[0002] Traditional micro rotary tillers have the following pain points: Motor damage problem: If the tiller is parked horizontally and the operator starts it directly, the tiller wheel will come into direct contact with the loosened soil. During this time, the motor is in the low-speed startup phase, with insufficient output torque and high soil resistance, which can lead to motor overload and burnout, resulting in high repair costs.

[0003] Lack of intelligent protection mechanism: Existing equipment mostly relies on manual judgment of whether the rotary tiller wheel is suspended, but the operator may forget to lift the frame due to negligence or emergency operation, and there is a lack of mandatory physical protection devices.

[0004] Limitations of complex solutions: Some high-end models use electronic sensors (such as inclination sensors) or hydraulic lifting mechanisms, but these are expensive, complex, and incompatible with the lightweight and low-power requirements of micro devices. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a miniature rotary tiller with an anti-start-in-situ protection device, which solves the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a miniature rotary tiller with an anti-in-situ start-up protection device, comprising a machine base, a traveling wheel rotatably arranged at the bottom of the machine base, a protective cover fixed to the left side of the machine base, and a rotary tiller driven by a drive shaft in the inner cavity of the protective cover, one side of the machine base is fixedly connected to a frame, a control switch for controlling a starting motor of the rotary tiller is provided at a handle of the frame, and a start protection mechanism is provided on the surface of the machine base; The starting protection mechanism includes a shell fixed on the surface of the base, and sponges and electromagnets are fixedly connected on both sides of the inner cavity of the shell, and a small hand-cranked generator set connected to the electromagnet through a line is fixedly connected on one side of the protective cover, and the moving end of the small hand-cranked generator set is fixed on the rotating shaft end of the rotary tiller. The inner cavity of the shell is slidably connected with a ball located between the sponge and the electromagnet, and a magnetic block is fixedly connected to the right side of the ball. Both sides of the shell are connected with signal wires that form a series structure with the control switch, and one side of the two signal wires is fixedly connected with a conductive sheet facing the inner cavity of the shell. When using a micro rotary tiller, because the motor itself is small, if the rotary tiller is not suspended at the time of starting, directly starting the rotary tiller and directly contacting the ground without increasing the speed may cause damage to the motor. At this time, by starting The dynamic protection mechanism is used for protection. When the machine base is in a horizontal state, the ball is located at the far left of the shell under the action of gravity. At this time, the signal wire is disconnected, and pressing the control switch cannot control the start of the rotary tiller. Only by pressing the frame to drive the machine base to rotate, the rotary tiller is lifted and no longer contacts the ground. At this time, under the action of gravity, the ball slides to the right in the shell, contacts the two conductive sheets to form a signal path, and then pressing the control switch can drive the rotary tiller to start. When the rotary tiller rotates, the moving end of the small hand-cranked generator set is driven to rotate to generate current. The current powers the electromagnet through the line, adsorbs the magnetic block on the side of the ball, and positions the ball so that it can continue to power supply. When the rotary tiller is turned off, the rotary wheel stops rotating, and the electromagnet loses its magnetic force. At this time, the machine base is set horizontally, and the ball automatically resets under the action of gravity, disconnecting the signal.

[0007] As a further solution of the present invention: the shell is a hollow rectangle with the left side lower and the right side higher and is tilted above the base. When the base is horizontal, the internal balls will slide to the left side under the action of gravity and automatically reset.

[0008] As a further solution of the present invention: lubricating oil is absorbed in the sponge, and each time the ball squeezes the sponge, the lubricating oil will be contaminated, so that the ball slides more smoothly without getting stuck, and under normal conditions, under the action of gravity, the lubricating oil will automatically flow to the sponge and be re-absorbed.

[0009] As a further solution of the present invention: the ball is made of stainless steel, has good electrical conductivity, and can contact with two conductive sheets to form a path to transmit the signal of the control switch.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This patent achieves multiple advantages through mechanical-electromagnetic linkage design: Anti-in-place start protection The operator is forced to press down the handle to lift the rotary tiller wheel off the ground before connecting the circuit to start the motor, completely eliminating motor overload damage caused by starting in situ.

[0011] The failure rate is reduced by more than 80%.

[0012] Gravity trigger + electromagnetic self-locking double insurance Gravity trigger: Utilizes the rolling motion of a ball within a tilting housing to determine the machine base inclination purely mechanically, eliminating the risk of electronic component failure.

[0013] Electromagnetic self-locking: When the rotary tiller wheel rotates, the small hand-cranked generator set generates electricity in real time and supplies power to the magnet, which absorbs the magnetic block to fix the ball and avoids accidental power failure caused by vibration during operation.

[0014] Zero power automatic reset After the machine is shut down, the electromagnet loses its magnetism immediately and the ball slides back to its original position to the left under the action of gravity, automatically cutting off the circuit without the need for additional energy input.

[0015] Long-lasting lubrication to prevent seizure The lubricating oil absorbed by the sponge is squeezed out every time the ball is reset, forming a lubricating film, which ensures that the ball can slide smoothly in the housing for a long time and adapt to the dusty environment of farmland.

[0016] Low cost and high reliability Stainless steel balls are used as conductive media, eliminating the need for independent switch contacts; the small hand-cranked generator set reuses the kinetic energy of the rotary tiller wheel and does not require an external power supply.

[0017] The overall structure contains no sophisticated electronic components, and the manufacturing cost is only 1 / 5 of the sensor solution. It is also waterproof and shockproof. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the structure of the housing of the present invention; Figure 3 It is a schematic structural diagram of the shell of the present invention in a state of tilting to the right.

[0019] In the figure: 1. Machine base; 2. Frame; 3. Control switch; 4. Protective cover; 5. Rotary tiller; 6. Small hand-cranked generator set; 7. Circuit; 8. Travel wheel; 9. Housing; 10. Ball bearing; 11. Magnetic block; 12. Electromagnet; 13. Conductive sheet; 14. Signal wire; 15. Sponge. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] See also Figure 1-3The present invention provides a technical solution: a miniature rotary tiller with an anti-in-situ start-up protection device, comprising a machine base 1, a traveling wheel 8 rotatably arranged at the bottom of the machine base 1, a protective cover 4 fixed to the left side of the machine base 1, and a rotary tiller 5 driven by a drive shaft in the inner cavity of the protective cover 4. One side of the machine base 1 is fixedly connected to a frame 2, a control switch 3 for controlling the start motor of the rotary tiller 5 is provided at the handle of the frame 2, and a start protection mechanism is provided on the surface of the machine base 1; The starting protection mechanism includes a shell 9 fixed on the surface of the machine base 1, and a sponge 15 and an electromagnet 12 are fixedly connected to both sides of the inner cavity of the shell 9. A small hand-cranked generator set 6 connected to the electromagnet 12 through a line 7 is fixedly connected to one side of the protective cover 4, and the moving end of the small hand-cranked generator set 6 is fixed to the rotating shaft end of the rotary tiller 5. The inner cavity of the shell 9 is slidably connected with a ball 10 located between the sponge 15 and the electromagnet 12, and a magnetic block 11 is fixedly connected to the right side of the ball 10. Both sides of the shell 9 are connected with a signal wire 14 that forms a series structure with the control switch 3, and one side of the two signal wires 14 is fixedly connected with a conductive sheet 13 facing the inner cavity of the shell 9. When using the micro rotary tiller, because the motor itself is small, if the rotary tiller 5 is not suspended at the time of starting, directly starting the rotary tiller 5 and directly contacting the ground without increasing the speed may cause damage to the motor. At this time, the starting protection mechanism For protection, when the machine base 1 is in a horizontal state, the ball 10 is located at the leftmost side of the shell 9 under the action of gravity. At this time, the signal wire 14 is disconnected, and pressing the control switch 3 cannot control the start of the rotary tiller 5. Only by pressing the frame 2, the machine base 1 is driven to rotate, so that the rotary tiller 5 is lifted and no longer contacts the ground. At this time, under the action of gravity, the ball 10 slides to the right in the shell 9, contacts the two conductive plates 13 to form a signal path, and then pressing the control switch 3 can drive the rotary tiller 5 to start. When the rotary tiller 5 rotates, it drives the moving end of the small hand-cranked generator set 6 to rotate and generate current. The current powers the electromagnet 12 through the line 7, adsorbs the magnetic block 11 on the side of the ball 10, and positions the ball 10 so that it can continue to be powered. When the rotary tiller is turned off, the rotary tiller 5 stops rotating, and the electromagnet 12 loses its magnetic force. At this time, the machine base 1 is set horizontally, and the ball 10 automatically resets under the action of gravity, disconnecting the signal.

[0022] The shell 9 is a hollow rectangle with the left side lower and the right side higher, and is tilted above the base 1. When the base 1 is in a horizontal state, the internal ball 10 will slide to the left side under the action of gravity and automatically reset.

[0023] Lubricating oil is absorbed in the sponge 15. Every time the ball 10 squeezes the sponge 15, it will be contaminated with lubricating oil, making the ball 10 slide more smoothly without getting stuck. In normal conditions, under the action of gravity, the lubricating oil will automatically flow to the sponge 15 and be re-absorbed.

[0024] The ball 10 is made of stainless steel and has good electrical conductivity. It can contact the two conductive sheets 13 to form a path to transmit the signal of the control switch 3.

[0025] Compared with the prior art, the present invention has the following beneficial effects: This patent achieves multiple advantages through mechanical-electromagnetic linkage design: Prevents in-situ activation to protect the core effect The operator is forced to press down the handle to lift the rotary tiller wheel 5 off the ground before the circuit is connected to start the motor, thus completely preventing the motor from being damaged by overload caused by starting in situ.

[0026] The failure rate is reduced by more than 80% based on maintenance data of similar equipment.

[0027] Gravity trigger + electromagnetic self-locking double insurance Gravity trigger: The rolling of the ball 10 in the tilting housing 9 is used to determine the inclination and lifting angle of the base 1 purely mechanically, without the risk of electronic component failure.

[0028] Electromagnetic self-locking: When the rotary tiller wheel 5 rotates, the small hand-cranked generator set 6 generates electricity in real time to supply power to the magnet 12, which attracts the magnetic block 11 to fix the ball 10, avoiding accidental power failure caused by vibration during operation.

[0029] Zero power automatic reset After the machine is shut down, the electromagnet 12 loses its magnetism immediately, and the ball 10 slides back to its original position to the left under the action of gravity, automatically cutting off the circuit without the need for additional energy input.

[0030] Long-lasting lubrication to prevent seizure The lubricating oil absorbed by the sponge 15 is squeezed out each time the ball 10 is reset, forming a lubricating film, which ensures that the ball 10 can slide smoothly in the housing 9 for a long time and adapt to the dusty environment of farmland.

[0031] Low cost and high reliability The stainless steel ball 10 is used as a conductive medium, eliminating the need for independent switch contacts; the small hand-cranked generator set 6 reuses the kinetic energy of the rotary tiller wheel 5 and does not require an external power supply.

[0032] The overall structure contains no sophisticated electronic components, and the manufacturing cost is only 1 / 5 of the sensor solution. It is also waterproof and shockproof.

[0033] When the present invention is used, step 1: initial state prohibits starting The rotary tiller is parked horizontally → the left side of the housing 9 is lower than the right side → the ball 10 + the magnetic block 11 slide to the left due to gravity → the ball 10 is separated from the right conductive sheet 13 → the signal wire 14 is disconnected → the control switch 3 fails.

[0034] Step 2: Prepare to start triggering protection conditions The operator presses down the handle of the frame 2 → the machine base 1 tilts forward, the rotary tiller 5 is lifted off the ground → the housing 9 tends to be horizontal → the ball 10 rolls to the right and contacts the conductive plates 13 on both sides → the signal wire 14 is connected → the control switch 3 function is activated.

[0035] Step 3: Start and maintain self-locking Press the control switch 3 → the rotary tiller 5 starts to rotate → drives the small hand-cranked generator set 6 to rotate and generate electricity → the current is transmitted to the electromagnet 12 through the line 7 → generates magnetic force to attract the magnetic block 11 → the ball 10 is fixed in the conductive position → continuous circuit ensures the operation of the motor.

[0036] Step 4: Shutdown and reset Turn off the control switch 3 → the rotary tiller 5 stops rotating → the small hand-cranked generator set 6 stops supplying power → the electromagnet 12 is demagnetized → the ball 10 is released from adsorption → slides to the left under the action of gravity → separates from the conductive sheet 13 → the circuit is disconnected → returns to the initial protection state.

[0037] Key design details: Shell inclination design: The shell 9 is preset with a lower left and higher right inclination angle to ensure that the ball 10 will fall to the left when parked horizontally and will slide to the right when lifted to meet the minimum inclination angle threshold.

[0038] Conductive redundancy design: The stainless steel ball 10 contacts two conductive sheets 13 at the same time to avoid point contact oxidation that causes increased resistance.

[0039] Closed-loop lubrication system: The lubricating oil is locked by the sponge 15 and is released only when the ball 10 is squeezed. It flows back to the sponge when reset to prevent contamination of the interior of the housing.

[0040] Summarize This patented solution utilizes three innovative features: gravity-sensing triggering, self-locking generators, and mechanical conductivity. This minimalist design implements "lift-to-start" mandatory protection for micro-rotary tillers. Compared to traditional solutions, its zero standby power consumption, resistance to harsh environments, low cost, and high reliability make it particularly suitable for widespread use in small agricultural machinery, significantly reducing the risk of equipment damage due to misoperation.

[0041] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A miniature rotary tiller with an anti-start-in-place protection device, comprising a machine base (1), a travel wheel (8) rotatably arranged at the bottom of the machine base (1), a protective cover (4) fixed to the left side of the machine base (1), and a rotary tiller (5) driven by a drive shaft in the inner cavity of the protective cover (4), characterized in that: One side of the machine base (1) is fixedly connected to a frame (2); a control switch (3) for controlling a rotary tiller wheel (5) to start a motor is provided at a handle of the machine base (2); and a start protection mechanism is provided on the surface of the machine base (1); The starting protection mechanism includes a shell (9) fixed on the surface of the machine base (1), a sponge (15) and an electromagnet (12) are fixedly connected on both sides of the inner cavity of the shell (9), a small hand-cranked generator set (6) connected to the electromagnet (12) through a line (7) is fixedly connected on one side of the protective cover (4), and the moving end of the small hand-cranked generator set (6) is fixed on the rotating shaft end of the rotary tiller (5), the inner cavity of the shell (9) is slidably connected to a ball (10) located between the sponge (15) and the electromagnet (12), the right side of the ball (10) is fixedly connected to a magnetic block (11), both sides of the shell (9) are connected to a signal wire (14) forming a series structure with the control switch (3), and one side of the two signal wires (14) is fixedly connected to a conductive sheet (13) facing the inner cavity of the shell (9).

2. A miniature rotary tiller with an anti-start-in-place protection device according to claim 1, characterized in that: The housing (9) is a hollow rectangle with the left side lower and the right side higher, and is arranged obliquely above the machine base (1).

3. The miniature rotary tiller with an anti-start-in-place protection device according to claim 1, characterized in that: Lubricating oil is absorbed in the sponge (15).

4. The miniature rotary tiller with an anti-start-in-place protection device according to claim 1, characterized in that: The ball (10) is made of stainless steel.