CN211721178U

CN211721178U - Pruning shear

Info

Publication number: CN211721178U
Application number: CN201922452154.5U
Authority: CN
Inventors: 龚雨华; 李易之
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-23
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to pruning shears (100), which comprise a shell (1), a trigger (12), a motor (2) arranged in the shell (1), a transmission device (3), a control circuit board (11), a control unit and a shearing device (4) arranged at one end of the shell (1), the control unit controls the motor (2) to rotate, the motor (2) drives the shearing device (4) to move between opening and closing through the transmission device (3), the control unit is connected with a human body touch sensing device which comprises a sensing chip and a probe for sensing a human body, the probe is connected with the shearing device (4), when the shearing device (4) is touched by a human hand, the induction chip detects that the capacitance of the ground wire of the probe to the control circuit board (11) is increased, namely a human body touch signal is output to the control unit, and the control unit controls the motor to stop rotating. The utility model discloses a can prevent with simple structure that the staff from touching the blade, and because of the personal safety that the maloperation caused, factor of safety improves.

Description

Pruning shear

[ technical field ]

The utility model relates to an electric tool, in particular to pruning scissors in garden industry field.

[ background art ]

The pruning shears are used as a common electric tool of a garden tool, are convenient for a gardening worker to remove manual operation, have the advantages of time saving and labor saving, improve the working efficiency, and are widely applied.

Please refer to chinese utility model patent publication No. CN206967536U announced in 6/2/2018, which discloses an electric shears having a color sensing device on the housing for closing the control device, wherein the color sensing device includes a probe for sensing color, the probe is disposed at the connecting end of the housing and the blade and is arranged toward the direction of the cut, during the use, the hand of the operator wears gloves with corresponding color, when the hand is too close to the cut of the blade, the probe can accurately detect corresponding color, the control device is closed, and the electric shears is powered off. However, when the hand touches the blade but is not in the notch of the blade, or the color of the glove is fuzzy, the color sensor cannot detect the blade, so that the safety is affected, and unnecessary injuries are brought to gardening workers.

Therefore, there is a need for a new pruning shears to overcome the above-mentioned drawbacks.

[ contents of utility model ]

To the not enough of prior art, the utility model aims to provide a safe and reliable's pruning scissors.

The utility model provides a prior art problem can adopt following technical scheme: the cutting device comprises a shell, a trigger arranged in the shell, a motor arranged in the shell, a transmission device, a control circuit board, a control element electrically connected with the trigger, and a cutting device arranged at one end of the shell, wherein the control circuit board is provided with a ground wire, the control element is arranged on the control circuit board and is connected with the ground wire of the control circuit board, the control element is connected with the motor, the cutting device is connected with the motor through the transmission device, the control element controls the motor to rotate, the motor drives the cutting device to move between opening and closing through the transmission device, the control element is provided with an input end, the input end is connected with a probe, the probe is connected with the cutting device, a loop is formed among the probe, the control element and the ground wire of the control circuit board, the loop is provided with a capacitor, and when the cutting device is touched by a human hand, the control element controls the motor to stop rotating in time according to the change of the capacitance.

The further improvement scheme is as follows: the shearing device comprises a blade and a metal fixing piece for fixing the blade.

The further improvement scheme is as follows: the control element comprises a microprocessor and an induction chip, the microprocessor is connected with the induction chip, and the microprocessor and the induction chip are connected to the ground wire of the control circuit board.

The further improvement scheme is as follows: the probe is a wire, one end of the wire is connected to the induction chip, and the other end of the wire is connected to the metal fixing piece.

The further improvement scheme is as follows: the probe is a wire, one end of the wire is connected to the induction chip, and the other end of the wire is connected to the blade.

The further improvement scheme is as follows: when the shearing device is touched by a hand, the sensing chip outputs a low level signal, and when the shearing device is not touched by the hand, the sensing chip outputs a high level signal.

The further improvement scheme is as follows: the pruning shears are provided with a Hall circuit board electrically connected with the trigger, the trigger is continuously operated twice, the control circuit board is activated, and the trigger is operated again to perform shearing action.

The further improvement scheme is as follows: the motor is a brushless direct current motor.

Compared with the prior art, the utility model discloses following beneficial effect has: through form the return circuit between probe, control element and the control circuit board ground wire, and this return circuit is equipped with the electric capacity, and when the shearing mechanism had the staff touch, control element detected the probe and increased to the equivalent capacitance of control circuit board ground wire, and control element comes in time to control the motor stall according to the change of electric capacity, prevents that pruning scissors from hurting horticulture workman to improve the safety of pruning scissors, and directly through detecting human position, had the high characteristic of sensitivity.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is an exploded view of a pruning shear according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a control circuit of the pruning shears according to the present invention;

FIG. 3 is a circuit diagram of the induction chip of the pruning shears according to the present invention;

FIG. 4 is a circuit diagram of a second embodiment of the induction chip of the pruning shear of the present invention;

fig. 5 is an exploded view of a pruning shear according to a third embodiment of the present invention.

The meaning of the reference symbols in the figures:

100. pruning shears 1, shell 11, control circuit board 12, trigger 2, motor 3, transmission device 31, reduction box 32, sector gear transmission device 4, shearing device 41, aluminum piece 42, movable blade 43, fixed blade 44, Hall circuit board 5, battery pack 6, wire 7, input end 8, output end 9 and connection point

[ detailed description of the invention ]

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Please refer to fig. 1, which is a pruning shear 100 according to a first embodiment of the present invention, including a housing 1, a motor 2 installed in the housing 1, a transmission device 3, a control circuit board 11, a control element, a shearing device 4 disposed at one end of the housing 1, and a battery pack 5, wherein the transmission device 3 includes a reduction box 31 and a sector gear transmission device 32, in this embodiment, the motor 2 is a brushless dc motor, the motor 2 is located at the rear end of the transmission device 3, an output shaft end gear (not shown) of the motor 2 is engaged with a gear (not shown) of the reduction box 31 for driving connection, the control element controls the motor 2 to rotate, and the motor 2 drives the shearing device 4 to move between an open state and a closed state through the transmission device 3. The shearing device 4 comprises a blade, a metal fixing piece for fixing the blade and a hall circuit board 44, the metal fixing piece is a metal piece for installing the blade, the metal piece is an aluminum piece 41 in the embodiment, the aluminum piece 41 is arranged in the casing 1, the blade is partially embedded in the casing 1, the blade comprises a movable blade 42 and a fixed blade 43, one end of the movable blade 42 is connected with the sector gear transmission device 32 of the transmission device 3, the sector gear transmission device 32 drives the movable blade 42 to reciprocate under the rotation of the motor 2 to realize the opening and closing of the movable blade 42 and the fixed blade 43, the hall circuit board 44 is positioned near the sector gear transmission device 32, a magnetic body (not shown) is arranged on the sector gear transmission device 32, two hall elements (not shown) are arranged on the hall circuit board 44, when the magnetic body of the sector gear transmission device 32 swings to reach the hall element positions, the movable blade 42 reaches the maximum limit position of opening and closing, i.e., the movable blade 42 stops when it reaches the limit position.

The control element is installed on the control circuit board 11 and is connected with the ground wire of the control circuit board, the battery pack 5 is arranged at one end of the shell opposite to the shearing device 4, the control circuit board 11 is arranged between the battery pack 5 and the brushless motor 2, in the embodiment, the control element comprises a microprocessor MCU and an induction chip, the microprocessor MCU is connected with the Hall circuit board 44, and when the Hall element detects a magnetic body, the microprocessor MCU receives an output signal of the Hall circuit board 44 and controls the motor to work. The battery pack 5 has a power switch for supplying power to the control circuit board 11. The lower part of the shell is also provided with a trigger 12, the trigger 12 is arranged near the Hall circuit board 44 and is electrically connected with the Hall circuit board 44, the Hall circuit board 44 is also provided with a Hall element (not shown) corresponding to the trigger 12 for detecting the action of the trigger, a user realizes the starting and closing control of the pruning shears by pressing the trigger 12, in the using process, a power switch is pressed down to control the circuit board 11 to be electrified, when the wrench 12 is continuously and rapidly pressed twice, the pruning shears are activated, when the wrench is pressed down again, the motor 2 rotates to drive the transmission device 3 to move, then the movable blade 42 is driven to be closed to do shearing movement, when the wrench 12 is loosened, the movable blade 42 is opened to finish the shearing movement, when the wrench 12 is not operated within five minutes, the pruning shears are automatically locked, the pruning shears 100 cannot normally work, the wrench 12 needs to be continuously pulled up twice again, and the control circuit board 11 is activated, the trigger 12 is operated again, so that the shearing action can be carried out; when the long-time pressing wrench 12 is not less than two seconds, the blade is closed and locked; when the wrench 12 is not operated for ten minutes, the pruning shears 100 enters the sleep power-saving state, the pruning shears 100 cannot work normally, the control circuit board 11 is powered off, and the normal start work can be continued only by pressing the power switch again.

Referring to fig. 1 and 2, the control circuit board 11 further includes an inverter circuit including six switching tubes Q1-Q6 for driving the motor 2 to rotate, wherein a is an induction chip electrically connected to the MCU. The pruning shears 100 further comprises a probe, the probe is connected with the shearing device and connected with the sensing chip, a loop is formed among the probe, the sensing chip and the ground wire, the loop is provided with a capacitor, when the shearing device is touched by a hand, the sensing chip detects that the capacitor of the probe of the loop to the ground is increased, namely, a human touch signal is output to the microprocessor MCU, and the microprocessor MCU controls the motor to stop rotating. The probe of this embodiment is a single wire 6, one end of which is connected to the sensor chip and the other end of which is connected to an insert (not shown) which connects the wire to the aluminum member 41 by means of a screw. Referring to fig. 3, the sensing chip of this embodiment is a JG102 chip, a pair of input/output terminals is adopted, the input terminal 7 and the control circuit board are provided with a connection point 9 corresponding to the input terminal 7, the connection point 9 is connected to a wire, a capacitor C1 and a resistor R1 are connected in series between the connection point 9 and the input terminal 7, the resistor R1 can improve the anti-interference capability and the anti-static effect, the output terminal 8 is connected to an input end of a microprocessor MCU, the microprocessor MCU controls the motor 2 according to the output of the sensing chip, because the blade and an aluminum member are installed in contact, when a hand touches any position of the blade, the wire 6 also senses the touch of the hand through the aluminum member 41, and at this time, the wire 6, the resistor R1, the capacitor C1 and a ground wire of the control circuit board form a loop, and because the human body carries charges, the sensing chip detects that the equivalent capacitance of the wire 6 to, when the blade is not touched by a human hand, the induction chip outputs a high level signal, when the microprocessor MCU detects the low level signal of the induction chip, the lower switching tubes Q4, Q5 and Q6 of the inverter circuit are controlled to be switched on to brake the motor, the motor 2 is rapidly stopped, at the moment, even if the trigger 12 is operated, the motor 2 does not act, if the human hand is separated from the blade, the motor is normal, the trigger 12 is operated, and the motor rotates.

Referring to fig. 4, for the second embodiment of the present invention, the sensing chip adopts a pair of input/output terminals, the input terminal 7 has a connection point 9 corresponding to the input terminal 7 on the control circuit board, the connection point 3 is connected with a wire, a resistor R1 is connected in series between the connection point 9 and the input terminal 7, and the resistor R1 can improve the anti-interference capability and the anti-static effect. Because the blade and the aluminum piece are installed in a contact manner, when a hand touches any position of the blade, the lead 6 also senses the touch of the hand through the aluminum piece 41, and at the moment, the lead 6, the resistor R1 and the ground wire of the control circuit board form a loop, and because a human body carries charges, the sensing chip detects that the equivalent capacitance of the lead 6 to the ground is increased, namely a low-level signal is output, and when the blade is not touched by the hand, the sensing chip outputs a high-level signal.

Please refer to fig. 4, which is a pruning shear 100 according to the third embodiment of the present invention, the human touch sensing device includes a sensing chip and a probe, the sensing chip is installed on the control circuit board and connected to the microprocessor MCU, the probe is connected to the shearing device, when the shearing device is touched by a human hand, the sensing chip detects the increase of the capacitance to the ground of the probe, i.e., outputs a human touch signal to the microprocessor MCU, and the microprocessor MCU controls the motor to stop rotating. In this embodiment, the probe is set as a wire 6, one end of the probe is connected with the sensing chip, the other end of the probe is connected with an insert (not shown), the insert is connected with any blade by a screw, the blade is made of metal, and the two blades are connected by metal contact, so when a human hand touches any blade, the sensing chip can sense a human hand touch signal, when the blade does not touch by the human hand, the sensing chip outputs a high level signal, when the human hand touch is detected, a low level signal is output, when the microprocessor MCU detects the low level signal of the sensing chip, the lower switch tube of the inverter circuit is controlled to be on, the motor is braked, and the motor is rapidly stopped, at this time, even if the trigger 12 is operated, the motor 2 does not act, if the human hand is separated from the blade, the motor is normal, the trigger 12 is operated.

The utility model discloses a pruning scissors the control unit control motor rotatory, the motor passes through transmission drive shearing mechanism and opens and the closure between the motion, and the control unit is connected with human touch-sensitive device, human touch-sensitive device is including being used for responding to human probe and response chip, and the probe is connected with shearing mechanism, and the response chip is connected with the microprocessor MCU of control unit, and when the shearing mechanism had the staff touch, the response chip detected the electric capacity increase to ground of probe, exports human touch signal to the control unit promptly, and the control unit control motor stall, for prior art, the utility model discloses control is simple, the security performance is high and sensitivity is high.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many alternatives to the present invention are possible without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims

1. A pruning shear (100) comprises a shell (1), a trigger (12) arranged in the shell, a motor (2) arranged in the shell (1), a transmission device (3), a control circuit board (11), a control element electrically connected with the trigger (12), and a shearing device (4) arranged at one end of the shell (1), wherein the control circuit board (11) is provided with a ground wire, the control element is arranged on the control circuit board (11) and is connected with the ground wire of the control circuit board (11), the control element is connected with the motor (2), the shearing device (4) is connected with the motor (2) through the transmission device (3), the control element controls the motor (2) to rotate, and the motor (2) drives the shearing device (4) to move between opening and closing through the transmission device (3); the method is characterized in that: the control element is provided with an input end which is connected with the probe, the probe is connected with the shearing device (4), a loop is formed among the probe, the control element and the ground wire of the control circuit board (11), the loop is provided with a capacitor, when the shearing device (4) is touched by a hand, the control element detects that the equivalent capacitance of the probe to the ground wire of the control circuit board (11) is increased, and the control element controls the motor (2) to stop rotating in time according to the change of the capacitor.

2. The pruning shears (100) according to claim 1, wherein: the shearing device (4) comprises a blade and a metal fixing piece for fixing the blade.

3. The pruning shears (100) according to claim 1, wherein: the control element comprises a microprocessor and an induction chip, the microprocessor is connected with the induction chip, and the microprocessor and the induction chip are connected to the ground wire of the control circuit board.

4. The pruning shears (100) according to claim 1 or 2, wherein: the probe is a lead (6), one end of the lead (6) is connected to the induction chip, and the other end of the lead is connected to the metal fixing piece.

5. The pruning shears (100) according to claim 1 or 2, wherein: the probe is a lead (6), one end of the lead (6) is connected to the induction chip, and the other end of the lead is connected to the blade.

6. The pruning shears (100) according to claim 1, wherein: when the shearing device (4) is touched by a hand, the sensing chip outputs a low level signal, and when the shearing device (4) is not touched by the hand, the sensing chip outputs a high level signal.

7. The pruning shears (100) according to claim 1, wherein: the pruning shears (100) are provided with Hall circuit boards (44) electrically connected with the trigger (12), the trigger (12) is continuously operated twice, the control circuit board (11) is activated, the trigger (12) is operated again, and shearing action can be carried out.

8. The pruning shears (100) according to claim 1, wherein: the motor (2) is a brushless direct current motor.