Torque setting system and torque setting method for electric tool

Abstract

The present invention discloses a torque setting system and method for an electric tool, and relates to the technical field of torque setting of electric tools, specifically comprising a drive component and a data storage module, an interactive panel, a current detection module, a timing module, and a switch electrically connected to the drive component; the data storage module is used to store the gear rotation speed, the effective rotation work duration, and the identification current calibration value corresponding to a number of torque setting gears; the drive component is used to control the interactive panel to receive the torque setting gear, control the switch to receive a control instruction, and control the current detection module to detect the real-time driving current of the motor; the torque setting system and method for the electric tool control the output rotation speed and the effective rotation work duration of the motor through an electric control drive system, realize the control of the output torque, and then realize the torque setting, which effectively solves the problems of traditional mechanical torque setting tools being large in size, high in cost, and lacking the ability to automatically power off.

Description

Technical Field

[0001] The present invention relates to the field of torque setting technology of electric tools, and more specifically, to a torque setting system of an electric tool. In addition, the present invention also relates to a torque setting method applied to the torque setting system of the electric tool. Background Art

[0002] Electric torque tools are handheld mechanical working tools that use battery packs as power sources, convert the rotational energy of electric motors into impact energy of metal parts, and then convert the impact energy into tightening torque. They are used to tighten and remove threaded fasteners. They are a large category of power tools.

[0003] At present, the striking structures of electric fixed torque tools are mainly of two types: impact type and clutch type. The ordinary striking structure is a metal block impact device, which does not have the torque-setting function, while the clutch-type striking structure can set the torque, but the striking component is expensive, the striking size is large, and it does not have the function of automatic power-off.

[0004] In summary, how to solve the problems of existing electric torque-fixing tools being large in size, high in cost, and not having automatic power-off function is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a fixed torque system for an electric tool, which controls the output speed and effective rotational working time of the motor through an electronically controlled drive system, thereby achieving control of the output torque and further achieving fixed torque, thereby effectively solving the problems of traditional mechanical fixed torque tools being large in size, high in cost, and lacking automatic power-off capability.

[0006] Another object of the present invention is to provide a torque setting method, which is applied to the torque setting system of the above-mentioned electric tool and can solve the same technical problem and achieve the same purpose.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A torque-fixing system for an electric tool, used for controlling the output torque of a motor, comprises a drive assembly and a data storage module electrically connected to the drive assembly, an interactive panel, a current detection module, a timing module, and a switch;

[0009] The data storage module is used to store the corresponding gear speed, effective rotation work duration and identification current calibration value under a plurality of fixed torque gears;

[0010] The driving component is used to control the interactive panel to receive the fixed torque gear, control the switch to receive a control instruction, control the current detection module to detect the real-time driving current of the motor, and read the data corresponding to the fixed torque gear in the data storage module, and compare the real-time driving current with the identification current calibration value, and control the timing module to count the time length when the real-time driving current is greater than the identification current calibration value;

[0011] The driving component drives the motor to rotate according to the gear speed until the time length counted by the timing module is not less than the effective rotation work time length, and then stops driving the motor to rotate.

[0012] Preferably, the effective rotational work duration in different fixed torque gears varies linearly.

[0013] Preferably, the interactive panel includes a display screen and control buttons, the display screen is used to display the currently set torque setting position, and the control buttons are used to input or change the torque setting position.

[0014] Preferably, the interactive panel also includes a three-color indicator light, and the three colors are used to indicate that the system is normal and running, the system is normal and the operation is completed, and the system is abnormal and the operation is not completed.

[0015] Preferably, the switch also includes a direction-changing switch for changing the rotation direction of the motor through the drive assembly.

[0016] Preferably, it also includes a lighting module connected to the driving assembly, which is used to provide lighting for the output end of the power tool.

[0017] A torque setting method, applied to the torque setting system of any one of the above-mentioned power tools, the method comprising:

[0018] Controlling the interactive panel to receive the gear information of the fixed torque gear, and transmitting the gear information to the driving component;

[0019] Controlling the switch to receive a control instruction and transmitting the control instruction to the driving component;

[0020] The driving component reads the gear information corresponding to the fixed torque gear in the data storage module, and controls the motor to output torque according to the gear speed in the gear information;

[0021] Controlling the current detection module to read the real-time driving current of the motor, transmit the real-time driving current to the driving component, and compare the real-time driving current with the identification current calibration value in the gear information;

[0022] When the real-time driving current of the motor is not less than the identification current calibration value in the gear information, controlling the timing module to start timing;

[0023] When the timing of the timing module is not less than the effective rotation work duration in the gear information, the driving component controls the motor to stop rotating.

[0024] Preferably, the switch is controlled to receive a control instruction and transmit the control instruction to the drive component;

[0025] During this process, if the control instruction received by the switch is to control the motor to rotate in the reverse direction, the drive component controls the motor to rotate in the reverse direction at maximum power until the switch receives a control instruction to stop the motor from rotating.

[0026] Compared with the prior art, the torque setting system of the electric tool provided by the present invention has at least the following beneficial effects:

[0027] 1. This system controls the effective rotation working time and speed of the motor through the electronic control drive system to achieve fixed torque. Its mechanical structure is simple, cost-effective, and occupies a small space. At the same time, it is controlled by the electronic control drive system. When the effective rotation working time is reached, it can automatically cut off the power to prevent the torque from exceeding the set value;

[0028] 2. The system integrates a data storage module, which stores several sets of torque setting positions internally to meet different torque setting requirements. The torque setting positions can be selected through the interactive panel. The operation is simple and convenient, and the actual use experience is excellent.

[0029] The torque setting method provided by the present invention is applied to the torque setting system of the above-mentioned electric tool and has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 A logic diagram of a torque setting system of a specific electric tool provided by the present invention;

[0032] Figure 2 The figure is a flow chart of a specific torque setting method provided by the present invention.

[0033] In the figure:

[0034] 1. Driving component; 2. Interactive panel; 3. Switch; 4. Direction switch; 5. Motor; 6. Indicator light; 7. Current detection module; 8. Timing module; 9. Data storage module. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The core of the present invention is to provide a torque-fixing system for an electric tool. Through an electronically controlled drive system, the output speed and effective rotational working time of the motor are controlled to achieve control of the output torque, thereby achieving constant torque, effectively solving the problems of traditional mechanical torque-fixing tools being large in size, high in cost, and lacking automatic power-off capability.

[0037] Another core of the present invention is to provide a torque setting method, which is applied to the torque setting system of the above-mentioned electric tool and can solve the same technical problem and achieve the same purpose.

[0038] Please refer to Figure 1 , a torque-fixing system of an electric tool, used for controlling the output torque of a motor 5 when doing work, comprising a drive component 1 and a data storage module 9 electrically connected to the drive component 1, an interactive panel 2, a current detection module 7, a timing module 8, and a switch 3;

[0039] The data storage module 9 is used to store the corresponding gear speeds, effective rotation work durations and identification current calibration values ​​under a plurality of fixed torque gears;

[0040] The driving component 1 is used to control the interactive panel 2 to receive the fixed torque gear, control the switch 3 to receive the control instruction, control the current detection module 7 to detect the real-time driving current of the motor 5, and read the data corresponding to the fixed torque gear in the data storage module 9, and compare the real-time driving current with the identification current calibration value, and control the timing module 8 to count the time length when the real-time driving current is greater than the identification current calibration value;

[0041] The driving assembly 1 drives the motor 5 to rotate according to the gear speed until the time length counted by the timing module 8 is not less than the effective rotation work time length, and then stops the driving motor 5 from rotating.

[0042] On the basis of the existing impact electric fixed torque tool, the fixed torque system of the electric tool is added; the system controls the output speed and effective rotation working time of the motor 5 by electronic control, thereby realizing the function of fixed torque, without adding the mechanical structure of the electric tool, avoiding increasing the occupied space and production cost of the electric tool;

[0043] When performing a fixed torque operation, after the working end of the power tool is loaded with a load, the driving current of the motor 5 increases rapidly to a value above the identification current calibration value, and the timing module 8 starts timing, which is calculated as the effective rotation working time of the motor 5. When the calculated effective rotation working time is not shorter than the preset value, the driving component 1 stops the rotation of the motor 5, that is, the fixed torque operation is completed, and the automatic power-off function is realized;

[0044] The principle of the above-mentioned fixed torque operation is: by controlling the rotation speed of the motor 5, the striking frequency of the striking structure in the electric tool is controlled; by controlling the effective rotation working time of the motor 5, the effective number of striking times of the electric tool is controlled; by synchronously controlling the striking frequency and the number of striking times, the fixed torque at the load end is achieved.

[0045] When performing fixed torque operation, the working end of the power tool is idling, that is, the working end of the power tool is not loaded. At this time, the driving current of motor 5 is small and cannot reach the identification current calibration value. When the working end of the power tool is loaded, the driving current of motor 5 increases to a relatively stable current fluctuation range, and the minimum value of the fluctuation range is taken as the identification current calibration value.

[0046] In some embodiments, the effective rotation work duration in different fixed torque gears varies linearly;

[0047] In order to expand the torque range of the electric tool and improve the applicability of the electric tool, it is generally chosen to set several groups of torque setting gears in the torque setting system to meet different torque setting requirements; at the same time, in order to meet the striking frequency and number of strikes under different torque setting requirements and to enhance the operator's obvious perception of the difference between different torque setting gears, different effective rotational working times are set for different torque setting gears, that is, different effective striking times are set, and the time difference between adjacent torque setting gears is equal, such as setting 30 gears, and the time difference between each gear is 0.5 seconds, such as the effective striking time of different gears is 0.5 seconds, 1.0 seconds, 1.5 seconds, 2 seconds, 2.5 seconds, etc., and then, the gear speed is matched according to the torque setting requirements of different torques; and the matched gear speed is synchronously burned into the data storage module 9 along with the effective rotational working time.

[0048] In some embodiments, in order to comprehensively improve the differences between different gears, reduce the user's perception of gear changes, and improve the user experience, the gear table shown in the following table can be used:

[0049] Table 1 Gear table

[0050]

[0051] In some embodiments, the interactive panel 2 includes a display screen and a control button, the display screen is used to display the currently set torque setting position, and the control button is used to input or change the torque setting position;

[0052] An interactive panel 2 is provided at the tail end of the power tool to facilitate intuitive observation of the current gear information and adjustment of the gear, such as displaying the current gear and the set torque that can be achieved by the current gear on the display screen, and even the gear speed and effective rotational working time under the current gear, and also displaying information such as battery power. In some embodiments, the display screen adopts a touch screen, and the gear selection and switching can be performed directly on the screen to achieve set torques of different torques; however, in some embodiments, a control button is provided at the tail end of the power tool, and the gear selection and switching are performed by pressing the control button.

[0053] In some embodiments, the interactive panel 2 further includes a three-color indicator light 6, the three colors being used to indicate that the system is normal and running, the system is normal and the operation is complete, and the system is abnormal and the operation is not complete;

[0054] A three-color light is added to the tail end of the power tool. Different colors of light are used to indicate the working status of the power tool, so that users can intuitively understand the current status of the power tool. Compared with the information display on the display screen, the light display is more intuitive and concise, and easy to observe;

[0055] In some embodiments, an additional indicator light 6 is added to display other information such as battery power; or only a two-color indicator light 6 is used to indicate that the power tool is in a working state and that the power tool is in a non-working state.

[0056] In some embodiments, the switch 3 further includes a direction-adjusting switch 4 for changing the rotation direction of the motor 5 through the driving assembly 1;

[0057] A direction-adjusting switch 4 is integrated in the electric tool, and the direction of the output of the electric tool is changed by the direction-adjusting switch 4. The direction-adjusting switch 4 controls the reverse rotation of the motor 5, and the reverse rotation of the motor 5 is controlled by the driving component 1, without adding a mechanical structure, and the size of the electric tool is further reduced;

[0058] However, in some embodiments, the direction switch 4 changes the direction of the output of the power tool by adding a gear set and a clutch in the power tool, thereby changing the direction of the output end of the power tool without changing the direction of the motor 5 itself;

[0059] In some embodiments, a physical direction-adjusting switch 4 is used, and is independently designed from the switch 3 so as not to interfere with each other. When the fixing member is unscrewed, the direction-adjusting switch 4 is pressed. When the switch 3 obtains a start command, the motor 5 rotates in the reverse direction at maximum power until the switch 3 obtains a stop command and stops rotating.

[0060] In some embodiments, the direction adjustment switch 4 is integrated into the interactive panel 2, such as being arranged at the rear end of the power tool in the form of a control button, or being integrated into a touch display screen.

[0061] In some embodiments, the torque-fixing system of the electric tool further includes a lighting module connected to the driving assembly 1 for providing lighting for the output end of the electric tool;

[0062] When the switch 3 receives the control command, the lighting module lights up synchronously to provide lighting for the output end of the power tool, so as to facilitate the accurate combination of the output end of the power tool and the fastener.

[0063] In addition to the torque setting system of the electric tool disclosed in the above embodiments, the present invention also provides a torque setting method, which is applied to the torque setting system of the electric tool, such as Figure 2 As shown, the method includes:

[0064] The control interaction panel 2 receives the gear information of the fixed torque gear and transmits the gear information to the driving component 1;

[0065] The control switch 3 receives the control instruction and transmits the control instruction to the driving component 1;

[0066] The driving component 1 reads the gear information corresponding to the fixed torque gear in the data storage module 9, and controls the motor 5 to work and output torque according to the gear speed in the gear information;

[0067] The control current detection module 7 reads the real-time driving current of the motor 5, transmits it to the driving component 1, and compares it with the identification current calibration value in the gear information;

[0068] When the real-time driving current of the motor 5 is not less than the identification current calibration value in the gear information, the control timing module 8 starts timing;

[0069] When the timing of the timing module 8 is not less than the effective rotation work duration in the gear information, the driving component 1 controls the motor 5 to stop rotating.

[0070] When performing torque setting, the torque setting gear information has been pre-burned in the data storage module 9. The user can select the required torque setting gear in the interactive panel 2, and then combine the output end of the power tool with the workpiece, press the switch 3, and make the switch 3 obtain the instruction. At this time, the driving component 1 calls the specific gear information of the torque setting gear corresponding to the accessory storage module, and drives the motor 5 to move according to this gear information. At this time, the current detection module 7 detects the driving current of the motor 5. When it is detected that the driving current of the motor 5 is less than the corresponding identification current calibration value, it indicates that the power tool is no-loaded at this time, and the timing module 8 does not participate in the timing. If the current detection module 7 detects that the driving current of the motor 5 is greater than or equal to the corresponding identification current calibration value, it indicates that the output end of the power tool has been loaded. At this time, the timing module 8 starts timing. When the timing is greater than the corresponding effective rotation work time, no matter whether the switch 3 is in a pressed or non-pressed state at this time, the motor 5 stops rotating. If the torque setting operation is performed again, the switch 3 needs to be pressed again before the next torque setting operation can be performed.

[0071] In practical applications, it is specifically manifested as follows: when the switch 3 is pressed, the motor 5 rotates according to the gear information of the set torque gear. If there is no load on the output end of the power tool, the motor 5 continues to rotate at the set gear speed, or stops rotating after reaching the maximum set time. If the output end is loaded, the timing starts from the time when the driving current of the motor 5 reaches the identification current calibration value. When the set effective rotation work time is reached, the motor 5 automatically stops rotating. Even if the switch 3 is still in the pressed state at this time, the motor 5 still automatically stops rotating. If the motor 5 needs to continue to rotate, it is necessary to release the switch 3 and press it again, so that the power tool has the function of automatic power-off.

[0072] In some embodiments, the control switch 3 receives the control instruction and transmits the control instruction to the driving component 1;

[0073] During this process, if the control instruction received by the switch 3 is to control the motor 5 to rotate in the reverse direction, the drive assembly 1 controls the motor 5 to rotate in the reverse direction at the maximum power until the switch 3 receives the control instruction to stop the motor 5 from rotating;

[0074] When the electric tool is in use, in addition to tightening the fastener with a fixed torque, it is also necessary to unscrew the fastener. At this time, the direction adjustment switch 4 and the switch 3 in the electric tool can be operated synchronously, so that the switch 3 obtains the instruction to control the reverse output of the electric tool, such as reversing the motor 5 through the electric control system. At this time, the fastener does not need to be unscrewed with a fixed torque, and the motor 5 only needs to rotate in the reverse direction with maximum power, and there is no need to count the effective rotation work time. When the switch 3 obtains the stop instruction, the motor 5 can be stopped;

[0075] In practical application, the specific performance is that the direction adjustment switch 4 is turned to the reverse gear, the switch 3 is pressed, and the motor 5 is reversed at maximum power, and the switch 3 is stopped from being pressed, and the motor 5 stops rotating.

[0076] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0077] The torque setting system and torque setting method of the electric tool provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A torque control system for an electric tool, used for controlling the output torque of a motor (5), characterized in that: It comprises a driving component (1), a data storage module (9) electrically connected to the driving component (1), an interactive panel (2), a current detection module (7), a timing module (8), and a switch (3); The data storage module (9) is used to store the gear speeds, effective rotation work durations and identification current calibration values ​​corresponding to a plurality of fixed torque gears; The identified current calibration value is the minimum value of the driving current fluctuation range of the motor (5) after the electric tool is loaded; The driving component (1) is used to control the interactive panel (2) to receive the fixed torque gear, control the switch (3) to receive a control instruction, control the current detection module (7) to detect the real-time driving current of the motor (5), read the data corresponding to the fixed torque gear in the data storage module (9), compare the real-time driving current with the identification current calibration value, and control the timing module (8) to count the time length during which the real-time driving current is greater than the identification current calibration value; The driving component (1) drives the motor (5) to rotate according to the gear speed until the time length counted by the timing module (8) is not less than the effective rotation work time length, and then stops driving the motor (5) to rotate.

2. The torque setting system of the electric tool according to claim 1, characterized in that: The effective rotational work duration in different fixed torque gears varies linearly.

3. The torque setting system of the electric tool according to claim 1, characterized in that: The interactive panel (2) comprises a display screen and control buttons, the display screen is used to display the currently set torque setting position, and the control buttons are used to input or change the torque setting position.

4. The torque setting system of the electric tool according to claim 1, characterized in that: The interactive panel (2) also includes a three-color indicator light (6), wherein the three colors are used to indicate that the system is normal and running, the system is normal and the operation is complete, and the system is abnormal and the operation is not complete.

5. The torque setting system of the electric tool according to any one of claims 1 to 4, characterized in that: The switch (3) also includes a direction-changing switch (4) for changing the rotation direction of the motor (5) through the drive assembly (1).

6. The torque setting system of an electric tool according to any one of claims 1 to 4, characterized in that: It also comprises a lighting module, which is connected to the driving assembly (1) and is used to provide lighting for the output end of the electric tool.

7. A method for fixing a torque, characterized in that: The method for the torque fixing system of the electric tool according to any one of claims 1 to 5 comprises: Controlling the interactive panel (2) to receive the gear information of the fixed torque gear, and transmitting the gear information to the driving component (1); Controlling the switch (3) to receive a control instruction and transmitting the control instruction to the drive component (1); The driving component (1) reads the gear information corresponding to the fixed torque gear in the data storage module (9), and controls the motor (5) to produce work and output torque according to the gear speed in the gear information; Controlling the current detection module (7) to read the real-time driving current of the motor (5), transmit the real-time driving current to the driving component (1), and compare the real-time driving current with the identification current calibration value in the gear information; When the real-time driving current of the motor (5) is not less than the identification current calibration value in the gear information, controlling the timing module (8) to start timing; When the timing of the timing module (8) is not less than the effective rotation work duration in the gear information, the driving component (1) controls the motor (5) to stop rotating.

8. The method for fixing the torque according to claim 7, characterized in that: Controlling the switch (3) to receive a control instruction and transmitting the control instruction to the drive component (1); During this process, if the control instruction received by the switch (3) is to control the motor (5) to rotate in the reverse direction, the drive component (1) controls the motor (5) to rotate in the reverse direction at maximum power until the switch (3) receives a control instruction to stop the motor (5) from rotating.

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