Electric drill anti-twist hand control device and control method

Abstract

The present application relates to the technical field of electric drill, and relates to an electric drill anti-twist hand control device and a control method, which comprises a motor, a torque transmission device and a control assembly, the control assembly comprises a switch detection device, a current detection device, a working mode switching unit and an MCU control unit; the switch detection device is electrically connected with a switch; the current detection device is electrically connected with the motor; the MCU control unit is electrically connected with the current detection device; the working mode switching unit is electrically connected with the MCU control unit and the motor; the working mode switching unit comprises a rotating working unit and a pulse impact working unit; the MCU control unit switches the working mode switching unit according to the working current flowing through the motor; the MCU control unit compares the working current detected by the current detection device with the rotating working unit and the pulse impact working unit, switches the working mode of the motor, keeps the maximum output torque of the tool, and prevents the excessive reaction torque from being applied to the tool body.

Description

Technical Field

[0001] This invention relates to the field of electric drill technology, and specifically to an anti-twist control device and method for electric drills. Background Technology

[0002] In existing electric drills, when the drill bit accidentally locks in the drilling operation, an excessive torque is generated in the opposite direction to the rotation direction of the drill bit. This reaction torque acts on the tool body, which causes the tool body to swing to one side due to the excessive reaction torque. If the swing amplitude is too large, it can twist the operator's hand.

[0003] To achieve the anti-twist function, there are currently two main solutions: 1. Use an accelerometer or gyroscope sensor to detect changes in the rotation angle and stop the motor drive to achieve the anti-twist function; 2. Use a mechanical clutch to cut off torque transmission when the clutch disengagement value is exceeded to achieve the anti-twist function.

[0004] However, the existing technical solutions have the following drawbacks: 1. An acceleration sensor or gyroscope sensor will be added to the control board assembly, which increases the cost; 2. The conventional mechanical clutch is added between the motor and the drive mechanism that rotates the tool drill bit, which results in a large size in terms of structure and affects the appearance. Summary of the Invention

[0005] In view of the shortcomings of the prior art solutions described above, the purpose of this invention is to provide an anti-twist control device and control method for electric drills, which solves the problems of high cost and large space occupation in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A drill anti-twist control device, comprising:

[0008] An electric motor, which provides rotational power;

[0009] A torque transmission device for transmitting the rotational kinetic energy of a motor;

[0010] The control component includes a switch detection device, a current detection device, a working mode switching unit, and an MCU control unit. The switch detection device is electrically connected to a switch and is used to detect the switch status. The current detection device is electrically connected to a motor and is used to detect the operating current flowing through the motor. The MCU control unit is electrically connected to the current detection device. The working mode switching unit is electrically connected to both the MCU control unit and the motor. The working mode switching unit includes a rotary working unit and a pulse impact working unit. The rotary working unit's rotation protection current value is less than the pulse impact working unit's impact protection current value, and the duration of the rotary working unit is greater than the duration of the pulse impact working unit. The MCU control unit switches the working mode switching unit according to the operating current flowing through the motor.

[0011] A method for controlling the anti-twist handle of an electric drill includes the following steps:

[0012] S1: Detect the switch status using a switch detection device;

[0013] S2: If the switch detection device in S1 detects that the switch is open, then the current detection device detects the operating current A flowing through the motor;

[0014] S3: The MCU control unit compares the operating current A in S2 with the rotation protection current value B of the rotating working unit in the operating mode switching unit.

[0015] S4: If the operating current A is less than the rotation protection current value B, the operating mode switching unit is the rotation working unit. The MCU control unit controls the motor drive through the rotation working unit, and the motor is in normal operating mode.

[0016] S5: If the operating current A reaches the rotation protection current value B, the MCU control unit will compare the operating current A in S2 with the impact protection current value C of the pulse impact working unit in the working mode switching unit.

[0017] S6: If the operating current A is less than the impact protection current value C, the operating mode switching unit is the pulse impact operating unit. The MCU control unit controls the motor drive through the pulse impact operating unit, and the motor is in the anti-twist hand operating mode. If the operating current A reaches the impact protection current value C, the MCU control unit shuts off the motor and stops it from rotating.

[0018] In a further improvement, in step S4, if the operating current A is less than the rotation protection current value B, the switch detection device continues to detect whether the switch is pressed, and the MCU control unit compares the operating current A in S2 with the rotation protection current value B of the rotation working unit in the working mode switching unit again.

[0019] Compared with the prior art, the beneficial effects of the electric drill anti-twist control device and control method of the present invention are as follows:

[0020] The current detection device detects the actual operating current of the motor in real time. The MCU control unit compares the operating current measured by the current detection device with the rotary working unit and pulse impact working unit inside the working mode switching unit one by one, and switches the motor working mode suitable for the working condition in real time. This solves the problem of the maximum output torque of the tool and prevents the reaction torque from being applied too much to the tool body.

[0021] Compared with existing technologies, it does not require additional acceleration or gyroscope sensors, resulting in low cost; it does not require additional mechanical clutch devices, does not involve changes to the original structure, and can minimize size. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the control flow of the present invention.

[0024] In the diagram, 1-motor, 2-torque transmission device, 3-control component, 4-switch, 5-switch detection device, 6-current detection device, 7-working mode switching unit, 71-rotary working unit, 72-pulse impact working unit, 8-MCU control unit. Detailed Implementation

[0025] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The following is a description of the embodiments and appendices. Figures 1-2 The technical solution of the present invention will be further described below.

[0028] Example 1

[0029] A drill anti-twist control device includes: a motor 1, a torque transmission device 2, and a control component 3. The torque transmission device 3 is used to transmit the rotational kinetic energy of the motor 1. The control component 3 includes a switch detection device 5, a current detection device 6, a working mode switching unit 7, and an MCU control unit 8. The switch detection device 5 is electrically connected to a switch 4 and is used to detect the state of the switch 4. The current detection device 6 is electrically connected to the motor 1 and is used to detect the working current flowing through the motor 1. The MCU control unit 8 is electrically connected to the current detection device 6. The working mode switching unit 7 is electrically connected to the MCU control unit 8 and the motor 1. The working mode switching unit 7 includes a rotation working unit 71 and a pulse impact working unit 72. The rotation protection current value of the rotation working unit 71 is less than the impact protection current value of the pulse impact working unit 72. The duration of the rotation working unit 71 is greater than the duration of the pulse impact working unit 72. The MCU control unit 8 switches the working mode switching unit 7 according to the working current flowing through the motor 1. The duration of the pulse impact working unit 72 is less than 200ms. MCU (Microcontroller Unit) is a single-chip microcomputer.

[0030] Motor 1, which is configured to provide power for rotation;

[0031] The torque transmission device 2 is configured to transmit the rotational kinetic energy of the motor 1 to drive the tool drill bit to rotate the workpiece.

[0032] The workpiece being manipulated is the object being processed.

[0033] The current detection device 6 is configured to detect the operating current A flowing through the motor 1;

[0034] The working mode switching unit 7 is configured to switch different driving modes according to a preset working mode current threshold.

[0035] The MCU control unit 8 is configured to drive the motor according to the amount of operation of the workpiece, and when the operating current A of the motor 1 detected by the current detection device 6 reaches the working mode switching current threshold, it completes the mode switching between the rotary working unit 71 and the pulse impact working unit 72 in the working mode to achieve the anti-twisting function.

[0036] The battery provides power to the entire system.

[0037] A method for controlling the anti-twist handle of an electric drill includes the following steps:

[0038] S1: The state of switch 4 is detected by switch detection device 5;

[0039] S2: If the switch detection device 5 in S1 detects that the switch 4 is in the open state, then the current detection device 4 detects the working current A flowing through the motor 1.

[0040] S3: The MCU control unit 8 compares the operating current A in S2 with the rotation protection current value B of the rotation working unit 71 in the operating mode switching unit 7.

[0041] S4: If the operating current A is less than the rotation protection current value B, then the operating mode switching unit 7 becomes the rotation operating unit 71, and the MCU control unit 8 controls the motor 1 to drive through the rotation operating unit 71, and the motor 1 is in normal operating mode.

[0042] S5: If the operating current A reaches the rotation protection current value B, the MCU control unit 8 will compare the operating current A in S2 with the impact protection current value C of the pulse impact working unit 72 in the working mode switching unit 7.

[0043] S6: If the operating current A is less than the impact protection current value C, the operating mode switching unit 7 becomes the pulse impact operating unit 72. The MCU control unit 8 controls the motor 1 through the pulse impact operating unit 72, and the motor 1 is in the anti-twist hand operating mode. If the operating current A reaches the impact protection current value C, the MCU control unit 8 shuts off the motor 1 to stop rotating. The MCU control unit 8 shuts off the motor 1 to stop rotating, but the whole machine is not powered off, which is equivalent to electronic protection.

[0044] During normal operation, the rotational protection current value B of the motor should not be too large. A larger value results in a greater reaction force from the drill bit when it accidentally locks, leading to a larger swing amplitude applied to the tool body and increasing the risk of spraining the operator's hand. However, it should also not be too small, as a smaller value will result in a smaller torque applied to the workpiece, making screw tightening difficult. The rotational protection current value B can be between 20 amps and 80 amps.

[0045] In the anti-twist working mode, the motor protection current is higher than the protection current threshold in the normal working mode, but the duration is shorter. The higher protection current threshold in the anti-twist working mode ensures maximum torque output, while the shorter duration of the protection current threshold ensures a reasonable motor output rotation angle and a smaller swing amplitude on the tool body side, thereby reducing the occurrence of twisting.

[0046] The current detection device monitors the actual operating current of the motor in real time. The MCU control unit first compares the operating current measured by the current detection device with the rotation protection current value in the rotation working unit inside the working mode switching unit. When the operating current reaches the rotation protection current value of the rotation working unit, it then compares the operating current with the impact protection current value in the pulse impact working unit. The motor working mode suitable for the working condition is switched in real time, which solves the problem of the maximum output torque of the tool and prevents the reaction torque from being applied too much to the tool body.

[0047] The above-mentioned anti-twist hand control device and control method can also be applied to other power tools, such as metal cutting power tools other than electric drills, magnetic drills, electric reamers, and sanding power tools such as straight grinders, angle grinders, flexible shaft grinders, mold electric grinders, and sanders, to achieve control of the output angle and thus prevent the generation of anti-twist hands.

[0048] Compared with existing technologies, it does not require additional acceleration or gyroscope sensors, resulting in low cost; it does not require additional mechanical clutch devices, does not involve changes to the original structure, and minimizes size.

[0049] As a further preferred embodiment, in step S4, if the operating current A is less than the rotation protection current value B, the switch detection device 5 continues to detect the switch 4, and the MCU control unit 8 compares the operating current A in S2 with the rotation protection current value B of the rotation working unit 71 in the working mode switching unit 7 again. If the current is less than the rotation protection current value B, the program goes back to determine whether the switch 4 is pressed. If the trigger is not released, it will remain in normal working mode.

[0050] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for controlling the anti-twist handle of an electric drill, characterized in that, Includes the following steps: S1: Detect the switch status using a switch detection device; S2: If the switch detection device in S1 detects that the switch is open, then the current detection device detects the operating current A flowing through the motor; S3: The MCU control unit compares the operating current A in S2 with the rotation protection current value B of the rotating working unit in the operating mode switching unit. S4: If the operating current A is less than the rotation protection current value B, the operating mode switching unit is the rotation working unit. The MCU control unit controls the motor drive through the rotation working unit, and the motor is in normal operating mode. S5: If the operating current A reaches the rotation protection current value B, the MCU control unit will compare the operating current A in S2 with the impact protection current value C of the pulse impact working unit in the working mode switching unit. S6: If the operating current A is less than the impact protection current value C, the operating mode switching unit is the pulse impact operating unit. The MCU control unit controls the motor drive through the pulse impact operating unit, and the motor is in the anti-twist hand operating mode. If the operating current A reaches the impact protection current value C, the MCU control unit shuts off the motor and stops it from rotating. Also includes: An electric motor, which provides rotational power; A torque transmission device for transmitting the rotational kinetic energy of a motor; The control component includes a switch detection device, a current detection device, a working mode switching unit, and an MCU control unit. The switch detection device is electrically connected to a switch and is used to detect the switch status. The current detection device is electrically connected to a motor and is used to detect the operating current flowing through the motor. The MCU control unit is electrically connected to the current detection device. The working mode switching unit is electrically connected to both the MCU control unit and the motor. The working mode switching unit includes a rotary working unit and a pulse impact working unit. The rotary working unit's rotation protection current value is less than the pulse impact working unit's impact protection current value, and the duration of the rotary working unit is greater than the duration of the pulse impact working unit. The MCU control unit switches the working mode switching unit according to the operating current flowing through the motor.

2. The method for controlling the anti-twist handle of an electric drill according to claim 1, characterized in that, In step S4, if the operating current A is less than the rotation protection current value B, the switch detection device continues to detect whether the switch is pressed. The MCU control unit then compares the operating current A in step S2 with the rotation protection current value B of the rotation working unit in the working mode switching unit.

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