A method and system for an electric drill's anti-twist handle to adapt parameters to users

Abstract

The present invention relates to a method and system for an electric drill to adapt the anti-twist hand parameters to the user. By detecting the width of the user's palm, the preset maximum value I of the motor drive current is estimated y , and then during the use of the motor, the preset maximum value I of the motor drive current is gradually increased in the form of intermittent pulses y , until the preset maximum value I of the motor drive current y is adapted to the anti-twist bearing capacity of the user's arm, so as to maximize the efficiency of the electric drill under the use of this user. It solves the technical problem that the use performance of the electric drill is reduced by restricting the motor drive current to prevent torsion.

Description

Technical Field

[0001] The present invention belongs to the technical field of control and regulation, and particularly relates to a method and system for self-adapting the parameters of an electric drill to prevent wrist torsion for users. Background Art

[0002] When an electric drill is in use, there often occurs a phenomenon that the drill bit is blocked and the user's wrist is sprained. To overcome this problem, common methods include: (1) detecting the angular velocity and angular acceleration of the electric drill, and when the angular velocity or angular acceleration exceeds a predetermined value, starting protection and cutting off the power supply circuit of the motor; (2) detecting the magnitude of the current in the motor drive circuit, and when the current exceeds a set value, determining it as a stall and starting protection. These two methods can play a certain role, but there are still drawbacks. In the first method, when the angular velocity or angular acceleration is detected, the acceleration has already formed, and due to the inertia of the electric drill itself, the phenomenon of the user's wrist being sprained will still occur. For the second method, it cannot adapt to the use of different users. Since the arm strength of users varies greatly, in order to adapt to a wider range of users, the set value of the current for triggering protection is often set relatively low, thus the efficiency of the electric drill cannot be fully exerted. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a method for self-adapting the parameters of an electric drill to prevent wrist torsion for users, so as to solve the technical problem that the use performance of the electric drill is reduced by using the method of restricting the motor drive current to prevent torsion.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a method for self-adapting the parameters of an electric drill to prevent wrist torsion for users, which includes the following specific steps:

[0005] (1) After the electric drill is powered on, immediately detect the width of the palm holding the electric drill handle;

[0006] (2) Calculate the initial value of the anti-torsion bearing capacity according to the detected palm width;

[0007] (3) Calculate the preset maximum value T of the safe output torque of the electric drill and the preset maximum value I of the motor drive current according to the magnitude of the initial value of the anti-torsion bearing capacity; y and y ;

[0008] (4) During the operation of the electric drill, when the actual drive current of the motor is equal to the preset maximum value I; y , gradually increase the actual drive current in the form of pulses, with a certain time interval between each pulse, and each pulse drives the drill bit of the electric drill to rotate no more than 45°. At the same time, detect the torsion angle of the electric drill caused by each pulse. When the torsion angle of the electric drill handle caused by any pulse is less than 50% of the rotation angle of the drill bit, replace the pulse current with the preset maximum value I; y, when the twist angle of the drill handle caused by a certain pulse is equal to or greater than 50% of the rotation angle of the drill bit, terminate increasing the actual drive current, and set the preset maximum value I of the motor drive current y marked as the standard maximum value;

[0009] (5), control the motor drive current of the drill not to exceed the standard maximum value for operation.

[0010] As a preferred solution, in step (1), the palm width is detected by one or more of a grating, a strain gauge, a photosensitive sensor, and a proximity sensor, and the measured palm width value is sent to the controller.

[0011] As a preferred solution, in step (2), the specific method for calculating the initial value of the anti-twist bearing capacity according to the palm width is: statistically fit the function relationship between the palm width and the maximum torque of the forearm through big data, and then calculate the maximum torque value of the forearm, that is, the initial value of the anti-twist bearing capacity, according to the function and the known palm width.

[0012] As a preferred solution, in step (4), each pulse current is 101% - 105% of the latest current preset maximum value;

[0013] As a preferred solution, in step (4), the twist angle of the drill handle caused by the pulse current is detected by a gyroscope.

[0014] The further technical problem to be solved by the present invention is: to provide a system for a drill to adapt the anti-twist hand parameters to the user, and solve the technical problem that the use performance of the drill is reduced by restricting the motor drive current to prevent twisting.

[0015] To solve the above technical problem, the technical solution adopted by the present invention is: a system for a drill to adapt the anti-twist hand parameters to the user, including a controller, a palm width detection module, a control switch, a drive current detection module, a rotation angle detection module, and a power supply for power supply. The palm width detection module is connected to the controller, the control switch is connected to the controller, the power supply, and the motor. The drive current detection module is connected to the motor drive circuit and the controller to detect the motor drive current. The rotation angle detection module is connected inside the drill handle and electrically connected to the controller.

[0016] The palm width detection module includes a light-transmitting window provided on the handle and extending along the axial direction of the handle. The light-transmitting window is covered with a transparent or semi-transparent or light-transmitting cover plate. At least one photosensitive sensor is provided inside the handle. The photosensitive sensor is electrically connected to the controller. The photosensitive sensor detects the light intensity inside the handle and sends it to the controller.

[0017] Or the palm width detection module includes a light-transmitting window provided on the handle and extending along the axial direction of the handle. The light-transmitting window is covered with a transparent or semi-transparent or light-transmitting cover plate. A micro camera is provided inside the handle opposite to the light-transmitting window, and the micro camera is electrically connected to the controller.

[0018] As a preferred solution, the corner detection module is a gyroscope or an angular acceleration sensor or an angular velocity sensor.

[0019] The beneficial effects of the present invention are as follows: By detecting the user's palm width, the present invention calculates the preset maximum value I of the appropriate motor drive current y , and then during the use of the motor, the preset maximum value I of the motor drive current is gradually increased in the form of intermittent pulses y , until the preset maximum value I of the motor drive current y matches the anti-torsion bearing capacity of the user's arm, so as to maximize the efficiency of the electric drill under the use of this user. It solves the technical problem that the use performance of the electric drill decreases due to the method of restricting the motor drive current to prevent torsion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further details the specific embodiments of the present invention in conjunction with the drawings, where:

[0021] Figure 1 is the schematic diagram of the system of the present invention;

[0022] Figure 2 is a schematic structural diagram of the palm width detection module;

[0023] Figure 3 is another schematic structural diagram of the palm width detection module;

[0024] Figures 1 to 3 In the figure: 1. Handle, 2. Light-transmitting window, 3. Cover plate, 4. Photosensitive sensor, 5. Micro camera. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further details the specific implementation plans of the present invention in conjunction with the drawings. Embodiment 1

[0026] A method for an electric drill to adapt to the anti-torsion hand parameters of the user includes the following specific steps:

[0027] (1). After the electric drill is powered on, it detects the palm width of the hand holding the handle of the electric drill through one or more of a grating, a strain gauge, a photosensitive sensor, a proximity sensor, and a micro camera. The measured palm width value is sent to the controller of the electric drill. In this embodiment, it is preferably to use a photosensitive sensor, which has low cost, strong applicability, and high detection result accuracy.

[0028] (2) Calculate the initial value of the torsional resistance according to the detected palm width; the palm width is relatively positively correlated with the human body height, and the height is relatively positively correlated with the strength. Therefore, the functional relationship between the palm width and the maximum torque of the forearm is statistically fitted through big data, and then the maximum torque value of the forearm, that is, the initial value of the torsional resistance, is calculated according to the function and the known palm width.

[0029] (3) Calculate the preset maximum value T of the safe output torque of the electric drill according to the size of the initial value of the torsional resistance y and the preset maximum value I of the motor drive current y ; the preset maximum value I of the motor drive current can be calculated by the motor output torque = drive current × electromotive force × rotor resistance y .

[0030] (4) During the operation of the electric drill, detect the actual drive current of the motor. When the actual drive current of the motor is equal to the preset maximum value I y , gradually increase the actual drive current in the form of pulses, with an interval of at least 1 - 5 s between each pulse. Each pulse drives the drill bit to rotate no more than 45°. At the same time, use a gyroscope to detect the torsional angle of the electric drill caused by each pulse. When the torsional angle of the drill handle caused by any pulse is less than 50% of the rotation angle of the drill bit, replace the pulse current with the preset maximum value I y . When the torsional angle of the drill handle caused by a certain pulse is equal to or greater than 50% of the rotation angle of the drill bit, terminate increasing the actual drive current, and mark the preset maximum value I y of the motor drive current as the standard maximum value.

[0031] (5) Control the actual drive current of the motor during the operation of the electric drill not to exceed the standard maximum value.

[0032] In step (4), each pulse current is 101% - 105% of the latest current preset maximum value.

[0033] In step (4), detection devices such as an angular velocity sensor and an angular acceleration sensor can also be used to detect the torsional angle of the drill handle caused by the pulse current. Embodiment 2

[0034] Such as Figures 1 to 3A system for an electric drill anti-twist handle parameter self-adaptation to the user, which is used to implement the method described in Embodiment 1 above. The system includes a controller, a palm width detection module, a control switch, a drive current detection module, a rotation angle detection module, and a power supply for power supply. The palm width detection module is connected to the controller. The control switch is connected to the controller, the power supply, and the motor. The controller preferably uses a MOS transistor. The drive current detection module is connected to the motor drive circuit and the controller to detect the motor drive current. The rotation angle detection module is connected inside the electric drill handle and electrically connected to the controller to detect the rotation angle of the handle and send it to the controller.

[0035] As Figure 2 A palm width detection module as shown includes a light-transmitting window 2 provided on the handle 1 and extending along the axial direction of the handle 1. A transparent or semi-transparent or light-transmitting cover plate 3 is covered on the light-transmitting window 2. At least one photosensitive sensor 4 is provided inside the handle 1. The photosensitive sensor is electrically connected to the controller. The photosensitive sensor detects the light intensity inside the handle and sends it to the controller. In this embodiment, it is preferably set to three, arranged at equal intervals along the length direction of the light-transmitting window 2. The three photosensitive sensors 4 are respectively connected to the controller. The controller calculates the covered range of the light-transmitting window 2 according to the average value of the light intensity change rates before and after the user holds the handle 1 detected by the three photosensitive sensors 4, and further calculates the user's palm width.

[0036] As Figure 3 Another palm width detection module as shown includes a light-transmitting window 2 provided on the handle 1 and extending along the axial direction of the handle. A transparent or semi-transparent or light-transmitting cover plate 3 is covered on the light-transmitting window 2. A miniature camera 5 facing the light-transmitting window 2 is provided inside the handle 1. The miniature camera 5 is electrically connected to the controller. The miniature camera 5 takes an image of the light-transmitting window 2 and sends it to the controller. The controller calculates the user's palm width according to the image.

[0037] In this embodiment, the rotation angle detection module is a gyroscope or an angular acceleration sensor or an angular velocity sensor, preferably a gyroscope.

[0038] The above embodiments only illustratively explain the principles and effects of the present invention and some applied embodiments, rather than limiting the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A method for an electric drill to adapt the anti-twist handle parameters to the user, characterized in that, It includes the following specific steps: (1) After the electric drill is powered on, it detects the palm width of the hand holding the electric drill handle; (2) Calculate the initial value of the torsional resistance bearing capacity based on the detected palm width; (3) Calculate the preset maximum value T of the safe output torque of the electric drill according to the initial value of the torsional bearing capacity y and the preset maximum value I of the motor drive current y ; (4)During the operation of the electric drill, when the actual driving current of the motor is equal to the preset maximum value I y the actual driving current is gradually increased in the form of pulses. There is a certain time interval between each pulse. The rotation angle of the electric drill bit driven by each pulse does not exceed 45°. At the same time, the torsion angle of the electric drill caused by each pulse is detected. When the torsion angle of the electric drill handle caused by any pulse is less than 50% of the rotation angle of the electric drill bit, the pulse current is replaced with the preset maximum value I y . When the torsion angle of the electric drill handle caused by a certain pulse is equal to or greater than 50% of the rotation angle of the electric drill bit, the increase of the actual driving current is terminated, and the preset maximum value I y of the motor driving current is marked as the standard maximum value; (5) Control the motor drive current of the electric drill not to exceed the standard maximum value for operation; In step (2), the specific method for calculating the initial value of the torsional resistance bearing capacity based on the palm width is: statistically fit the functional relationship between the palm width and the maximum torque of the forearm through big data, and then calculate the maximum torque value of the forearm, that is, the initial value of the torsional resistance bearing capacity, according to the function and the known palm width.

2. The method for the electric drill anti-twist handle parameters to adapt to the user according to claim 1, characterized in that, In step (1), the palm width is detected by one or more of a grating, a strain gauge, a photosensitive sensor, and a proximity sensor, and the measured palm width value is sent to the controller.

3. The method for the electric drill anti-twist handle parameters to adapt to the user according to claim 1, characterized in that, In step (4), each pulse current is 101% - 105% of the latest preset maximum current value.

4. The method for the electric drill anti-twist handle parameters to adapt to the user according to claim 1, characterized in that, In step (4), the gyroscope is used to detect the torsional angle of the electric drill handle caused by the pulse current.

5. A system for an electric drill anti-twist handle parameter self-adaptation to users, which is used to implement the method described in claims 1 to 4 above, and is characterized in that, It includes a controller, a palm width detection module, a control switch, a drive current detection module, a rotation angle detection module, and a power supply for power supply. The palm width detection module is connected to the controller. The control switch is connected to the controller, the power supply, and the motor. The drive current detection module is connected to the motor drive circuit and the controller to detect the motor drive current. The rotation angle detection module is connected inside the electric drill handle and is electrically connected to the controller; The palm width detection module includes a light-transmitting window provided on the handle and extending along the axial direction of the handle. The light-transmitting window is covered with a transparent or semi-transparent or light-transmitting cover plate. At least one photosensitive sensor is provided inside the handle. The photosensitive sensor is electrically connected to the controller. The photosensitive sensor detects the light intensity inside the handle and sends it to the controller; Or the palm width detection module includes a light-transmitting window provided on the handle and extending along the axial direction of the handle. The light-transmitting window is covered with a transparent or semi-transparent or light-transmitting cover plate. A micro camera facing the light-transmitting window is provided inside the handle. The micro camera is electrically connected to the controller.

6. The system for an electric drill anti-twist handle parameter self-adapting to users according to claim 5, characterized in that, The rotation angle detection module is a gyroscope or an angular acceleration sensor or an angular velocity sensor.

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