Electric torque tool with speed regulation

Abstract

The application discloses a kind of electric fixed-torque tools with speed regulating function, it relates to electric fixed-torque tool technical field, it includes: clutch device, speed reducer, power device for driving clutch device rotation, shell, magnetic switch, inductor and control device, clutch device, speed reducer and power device are sequentially connected, and all be located in shell, speed reducer, power device and inductor are connected with control device;When the rotation torque of clutch device reaches preset torque, the gasket of clutch device can be separated from the output end of speed reducer and move forward along the axial direction, when the torque of clutch device is lower than preset torque, gasket can be reset under the action of elastic member of clutch device, magnetic switch is arranged on gasket, inductor is arranged on shell, inductor is used to induct the magnetic field change of magnetic switch to signal transmission to control device.The device can realize accurate fixed torque of fixed-torque electric tool without increasing additional accessories.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric torque tool, more particularly, to an electric torque tool with speed regulation function. BACKGROUND

[0002] In the prior art, a torque electric wrench generally consists of a motor power unit, a main control driving unit, a torque output and monitoring unit, an alarm unit and a battery unit. The main control driving unit drives the brushless motor to output torque, and when the torque output and monitoring unit reaches the set torque value, the main control circuit determines the signal and controls the brushless motor to stop rotating to output and display the corresponding warning signal. If not, the corresponding state alarm is output, indicating that the torque has not met the standard, reminding the operator of the state of repeated tightening, not reaching the torque value, slipping teeth, floating lock and other states affecting torque output. The speed regulation principle of the electric wrench is that during the driving process of the brushless motor, different duty cycles are set to adjust the rotating speed of the motor.

[0003] At present, the speed regulation of electric tools is usually achieved by the following methods: a torque electric tool is matched with an additional speed regulation controller, and the speed regulation controller is connected to adjust the speed when speed regulation is needed. This makes the torque electric tool itself need to increase a special interface connected with the speed regulation controller, a control circuit for speed regulation, a button and a display screen, etc., resulting in an increase in the manufacturing cost of the torque electric tool. Moreover, the torque electric tool needs to be connected to the upper computer software through the increased communication ports such as wireless WiFi and Bluetooth to adjust the speed by software, which will additionally increase the accessory and design cost.

[0004] In summary, how to accurately tighten the torque of the torque electric tool without adding additional accessories is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an electric torque tool with speed regulation function, which can accurately tighten the torque of the torque electric tool without adding additional accessories.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme:

[0007] An electric torque tool with speed regulation function, comprising: a clutch device for driving a screw to perform a driving operation, a speed reducer, a power device for driving the clutch device to rotate, a housing, a magnetic switch, an inductor and a control device, the clutch device, the speed reducer and the power device are connected in sequence and are all arranged in the housing, the speed reducer, the power device and the inductor are all connected with the control device.

[0008] When the rotating torque of the clutch device reaches a preset torque, a pad of the clutch device can be separated from the output end of the speed reducer and move forward in the axial direction, and when the torque of the clutch device is lower than the preset torque, the pad can be reset under the action of an elastic member of the clutch device, the magnetic switch is arranged on the pad, and the inductor is arranged on the shell and is used for sensing the magnetic field change of the magnetic switch to deliver a signal to the control device.

[0009] Preferably, the clutch device comprises a rotating shaft connected with the output shaft of the speed reducer, a self-locking sleeve arranged at the front end of the rotating shaft, the pad arranged at the rear end of the rotating shaft and matched with the speed reducer in rotation, and the elastic member arranged around the outer circumferential part of the rotating shaft, and the elastic member is arranged between the middle boss of the self-locking sleeve and the pad.

[0010] Preferably, the power device is a driving motor.

[0011] Preferably, the power device is a driving motor.

[0012] Preferably, the power device is a driving motor.

[0013] Preferably, the power device is a driving motor.

[0014] Preferably, the power device is a driving motor.

[0015] Preferably, the power device is a driving motor.

[0016] Preferably, the power device is a driving motor.

[0017] In use of the electric fixed-torque tool with the speed regulating function, the control device controls the power device to run, the power device transmits the torque to the speed reducer, the speed reducer adjusts the rotating speed and then transmits the torque to the clutch device to drive the clutch device to run.

[0018] Then, when the rotating torque of the clutch device is lower than the preset torque, the gasket is reset under the action of the elastic element of the clutch device, the magnetic switch is moved backward when the gasket moves backward, the inductor can real-time induct the change of the magnetic field to real-time obtain the torque change of the clutch device, the inductor can transmit the signal to the control device to adjust the torque of the power device.

[0019] In conclusion, the electric fixed-torque tool with the speed regulating function can realize the accurate fixed torque of the electric fixed-torque tool without adding additional accessories. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Fig. 1 The exploded view of the electric fixed-torque tool with the speed regulating function provided by the present application;

[0022] Fig. 2 The cross-sectional view of the electric fixed-torque tool with the speed regulating function;

[0023] Fig. 3 The structure schematic view of the display device and the transparent lampshade.

[0024] Figs. 1-3 In the present application,

[0025] 1 is clutch device, 11 is gasket, 12 is elastic member, 13 is rotating shaft, 14 is self-locking sleeve, 2 is speed reducer, 21 is steel ball, 3 is power device, 4 is housing, 41 is front LED lamp, 42 is transparent lampshade, 43 is display device, 44 is buzzer, 5 is magnetic switch, 6 is inductor, 7 is forward-reverse switch, 8 is main switch, 9 is control device. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] The core of the present application is to provide an electric torque tool with speed regulation function, which can realize accurate torque of the electric torque tool without additional accessories.

[0028] Please refer to Figs. 1 to 3 , Fig. 1 the explosion view of the electric torque tool with speed regulation function provided by the present application; Fig. 2 the cross-sectional view of the electric torque tool with speed regulation function; Fig. 3 the structural schematic view of the display device and the transparent lampshade.

[0029] The specific embodiment provides an electric torque tool with speed regulation function, which comprises a clutch device 1 for driving a screw to perform a nailing operation, a speed reducer 2, a power device 3 for driving the clutch device 1 to rotate, a housing 4, a magnetic switch 5, an inductor 6 and a control device 9, the clutch device 1, the speed reducer 2 and the power device 3 are connected in sequence and are all arranged in the housing 4, and the speed reducer 2, the power device 3 and the inductor 6 are all connected with the control device 9.

[0030] When the rotating torque of the clutch device 1 reaches a preset torque, the gasket 11 of the clutch device 1 can be separated from the output end of the speed reducer 2 and move forward in the axial direction, and when the torque of the clutch device 1 is lower than the preset torque, the gasket 11 can be reset under the action of the elastic member 12 of the clutch device 1, the magnetic switch 5 is arranged on the gasket 11, the inductor 6 is arranged on the housing 4, and the inductor 6 is used for sensing the magnetic field change of the magnetic switch 5 to deliver a signal to the control device 9.

[0031] It should be noted that the inductor 6 can be set as a high-precision Hall chip, and the magnetic field change caused by the operation of the clutch device 1 is detected by the cooperation of the high-precision Hall chip and the magnetic switch 5, and then the output and stop of the power device 3 are controlled by the control device 9. That is, the magnetic switch 5 moves in the plane relative to the Hall chip, and the magnetic field change caused thereby can determine the strength and time of the signal feedback, which is used to determine whether the torque reaches the standard. Therefore, the device can accurately determine the torque without increasing the cost of additional accessories and design.

[0032] In actual use, the shape, structure, size, material, position, etc. of the clutch device 1, the speed reducer 2, the power device 3, the shell 4, the magnetic switch 5, the inductor 6 and the control device 9 can be determined according to actual conditions and actual needs.

[0033] When the electric torque tool with speed regulation function provided by the application is used, the control device 9 can control the operation of the power device 3, the power device 3 transmits torque to the speed reducer 2, the speed reducer 2 can adjust the speed and then transmit the torque to the clutch device 1 to drive the clutch device 1 to operate. When the rotating torque of the clutch device 1 reaches the preset torque, the gasket 11 of the clutch device 1 can be separated from the output end of the speed reducer 2 and move axially forward, and the gasket 11 can drive the magnetic switch 5 to move forward when it moves forward. The magnetic switch 5 will cause a change in the magnetic field during the forward movement, and the inductor 6 can sense the change in the magnetic field in real time to obtain the torque change of the clutch device 1 in real time, and the inductor 6 can transmit the signal to the control device 9 to adjust the torque of the power device 3.

[0034] Then, when the rotating torque of the clutch device 1 is lower than the preset torque, the gasket 11 can be reset under the action of the elastic element 12 of the clutch device 1, and the gasket 11 can drive the magnetic switch 5 to move backward when it moves backward, and the inductor 6 can sense the change in the magnetic field in real time to obtain the torque change of the clutch device 1 in real time, and the inductor 6 can transmit the signal to the control device 9 to adjust the torque of the power device 3. Finally, the clutch device 1 can move back and forth while rotating, effectively driving the screw to perform the nailing operation.

[0035] In summary, the electric torque tool with speed regulation function provided by the application can accurately determine the torque of the electric torque tool without increasing additional accessories.

[0036] On the basis of the above-mentioned embodiments, preferably, the clutch device 1 comprises a rotating shaft 13 connected with the output shaft of the speed reducer 2, a self-locking sleeve 14 sleeved on the front end of the rotating shaft 13, a gasket 11 arranged on the rear end of the rotating shaft 13 and matched with the speed reducer 2, and an elastic member 12 arranged around the outer circumferential portion of the rotating shaft 13 and between the middle boss of the rotating shaft 13 and the gasket 11. The inner hole for accommodating the bit or tool head can be arranged on the front end of the rotating shaft 13, and the self-locking sleeve 14 is used to fix the bit or tool head. When the bit or tool head rotates, it can drive the screw to be assembled to rotate, thereby realizing the tightening or loosening operation.

[0037] It should be noted that the control device 9 can control the power device 3 to operate, the speed reducer 2 can adjust the torque of the power device 3, and then the output shaft of the speed reducer 2 can synchronously drive the rotating shaft 13 to rotate. When the rotating shaft 13 rotates, it can drive the self-locking sleeve 14 to rotate, and when the self-locking sleeve 14 rotates, it can realize the tightening or loosening of the screw. When the rotating torque of the clutch device 1 reaches the preset torque, the gasket 11 can be separated from the output end of the speed reducer 2 and move axially forward to compress the elastic member 12. The compressed elastic member 12 can provide a driving force for the resetting process of the gasket 11.

[0038] Preferably, the power device 3 is a driving motor. By controlling the current of the driving motor, the rotating torque of the driving motor can be adjusted.

[0039] Preferably, the positive and negative rotation switch 7 for controlling the positive and negative rotation of the driving motor is further included, and the positive and negative rotation switch 7 is connected with the control device 9. By adjusting the rotation direction of the driving motor through the positive and negative rotation switch 7, the tightening or loosening of the screw by the clutch device 1 can be controlled.

[0040] Preferably, the battery 45 for supplying power to the driving motor and the main switch 8 for controlling the speed gear of the driving motor are further included, and the battery 45 and the main switch 8 are both connected with the driving motor.

[0041] Therefore, the driving motor can be started by pressing the main switch 8, so that the driving motor is powered to operate. Moreover, multiple gears can be arranged on the main switch 8 to change the rotating speed and torque of the driving motor, so as to adjust the rotating speed and torque of the clutch device 1. The device can be subdivided into speed gears, which can be set according to customer requirements to meet the rotating speed requirements of various types of electric tools, so that the tool has higher efficiency, is more intelligent and more durable.

[0042] Preferably, the front end of the shell 4 is provided with the front LED lamp 41 for displaying whether the driving motor is in the powered state, and the rear end of the shell 4 is provided with the display device 43 for displaying the positive and negative rotation of the driving motor and the transparent lamp shade 42 for protecting the display device 43.

[0043] It should be noted that the main switch 8 is pressed to power on the driving motor, the LED lamp 41 is lighted, and the speed control mode can be entered by pressing the main switch 8 for a fixed time. For example, in a specific setting mode, the gear is adjusted by the number of times of pressing the main switch 8. A fixed gear is set in each control mode, such as 1-7 speed, two-gear switch stepless / two-step speed, etc., and the number of adjustment times and the gear can be indicated by the number of times of flashing of the display device 43. The device has the functions of on-off, speed adjustment, and reversing, and the operator can enter the speed adjustment mode by adjusting the control forward-reverse switch 7 and the main switch 8.

[0044] It should be further noted that the display device 43 can include two rear LED lamps (one red light and one green light), which are lighted (not flashing) when the driving motor is forward rotating, and the number of times of pressing the main switch 8 is the same. When the driving motor is reversed, the two rear LED lamps flash alternately (red and green flashing alternately), and the number of times of pressing the main switch 8 is irrelevant. In addition, the display device 43 can also have the following functions, for example, when the rotating torque of the clutch device 1 reaches the set torque, the power device 3 automatically stops, the torque of the clutch device 1 does not continue to rise, the green light in the display device 43 is lighted; if the main switch 8 in the working state is released in advance and cannot reach the preset torque, the red light in the display device 43 is lighted and an alarm signal is emitted; when the voltage of the battery 45 is lower than the set value, the red light in the display device 43 flashes continuously and an alarm signal is emitted.

[0045] On the basis of the above embodiment, preferably, the control device 9 includes a first part for detecting and judging the rotating torque of the rotating shaft 13 and a second part for detecting and judging the rotation angle of the rotating shaft 13, and the first part and the second part are connected with the alarm device. By adding the alarm device, the detection information and the judgment result of the first part and the second part can be transmitted to the control device 9 in real time and the corresponding alarm operation is performed.

[0046] Preferably, the alarm device includes a display lamp and a buzzer 44.

[0047] It should be noted that the device can perform tightening judgment and alarm, that is, after the tool is started in the forward rotating state, the rotating shaft 13, the self-locking sleeve 14, and the gasket 11 reach the set torque in a very short time, and then drive the magnetic switch 5 to move forward and backward to cause the millisecond signal of the inductor 6. The control device 9 can not only judge whether the torque value reaches the signal, but also judge the rotation angle value of the rotating shaft 13. If the rotation angle value of the rotating shaft 13 is less than the set repeated tightening standard value, it is judged as repeated tightening and an alarm is emitted. The alarm information is that the display lamp is lighted red and the buzzer 44 emits a whistle alarm to remind the operator to repair.

[0048] The tightening result judging process is: the output rotation direction of the rotating shaft 13 is adjusted by the forward and reverse rotation switch 7, in the forward rotation state, the main switch 8 is pressed, the control device 9 is started to operate, and the power device 3 is driven to output the torque. When the output torque of the clutch device 1 reaches the set value, the gasket 11 of the clutch device 1 generates a forward displacement, the displacement pushes the magnetic switch 5 to move forward, so as to cause the inductor 6 (the Hall switch) to generate a millisecond signal, the control device 9 judges the fluctuation time and change of the signal, so as to judge whether the output of the target torque is completed. And the result is fed back through the display lamp and the buzzer 44 of the alarm device.

[0049] The early stop judging and alarm process is: in the forward rotation state, the main switch 8 is pressed to start the power device 3, so as to drive the clutch device 1 to output the torque. If the main switch 8 is released early in the tightening process, the power device 3 stops rotating, and at this time, the inductor 6 has no signal feedback to the control device 9, at this time, it is judged that the tightening is unqualified operation, and the alarm is given.

[0050] Preferably, the front end of the speed reducer 2 is provided with a steel ball 21, the gasket 11 is provided with an annular groove in the circumferential direction, the steel ball 21 can roll along the annular groove, at least two arc-shaped bosses are arranged on the annular groove at equal intervals, and the speed reducer 2 is connected with the gasket 11 through the steel ball 21. When the torque of the clutch device 1 reaches the preset torque, the steel ball 21 jumps off a certain arc-shaped boss and enters the next arc-shaped boss. Three arc-shaped bosses can be arranged on the annular groove at equal intervals, so as to facilitate processing and manufacturing, and also to ensure the cooperation effect of the steel ball 21 and the arc-shaped boss.

[0051] It should be noted that the output structure of the device includes the power device 3 and the speed reducer 2, the front end of the speed reducer 2 is connected with the gasket 11 through the steel ball 21 to output the rotating action. The clutch device 1 mainly controls the torque range by the spring strength of the elastic member 12, and the elastic member 12 with corresponding strength can be selected according to different torque requirements. When the clutch device 1 works, the gasket 11 drives the rotating shaft 13 to move under the driving of the speed reducer 2, when the torque of the rotating shaft 13 reaches the set value, the gasket 11 is separated from the output end of the speed reducer 2 and moves axially forward, and the gasket 11 enters the next rotating position after being separated from the steel ball 21. The magnetic switch 5 is arranged below the gasket 11, and the magnetic switch 5 generates displacement and causes the magnetic field to change under the driving of the gasket 11. A fixed distance inductor 6 is arranged below the magnetic switch 5 and faces the magnetic switch 5, so as to accurately monitor the change of the magnetic field.

[0052] In order to further illustrate the use method of the electric torque tool with speed regulation function provided by the present application, the following example is given.

[0053] 1. Whenever the main switch 8 is pressed lightly, the front LED light 41 will light up. This state only indicates that the device is powered on, and the power unit 3 is not started. Maintain this state for a certain period of time, such as 5 seconds, and the device will then enter the corresponding speed setting mode.

[0054] 2. After entering the speed control mode, press the main switch 8 to set the speed. The number of times the main switch 8 is pressed can be indicated by the number of flashes on the display device 43;

[0055] 3. When the rotational torque of the clutch device 1 reaches the set torque during operation, the power unit 3 will automatically stop, and the torque of the clutch device 1 will not continue to increase. At this time, the green light in the display device 43 will light up.

[0056] 4. In the working state, if the main switch 8 is released in advance, the preset torque cannot be reached. At this time, the red light in the display device 43 will light up, and the alarm device will emit a long alarm sound to indicate that the screw needs to be driven and tightened again.

[0057] 5. When the voltage of battery 45 is lower than the set value, the red light in the display device 43 will flash continuously and emit an alarm sound to remind you to replace battery 45;

[0058] 6. After the clutch device 1 completes the torque output, wait 2 seconds before restarting the power device 3 to perform the tightening operation, to prevent the screws that have already been firmly tightened (anti-re-tightening function).

[0059] It should be noted that the first and second parts mentioned in this application are only distinguished by their different positions and do not have any order of precedence.

[0060] In addition, it should be noted that the orientation or positional relationship indicated by terms such as "above" and "below" mentioned herein is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the purpose of simplifying the description and facilitating understanding, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0062] The electric torque tool with the speed regulating function is described in detail. The principle and implementation of the present application are described by using specific examples. The above description of the examples is only used to help understand the method of the present application and its core idea. It should be pointed out that the ordinary skilled in the art can make some improvements and modifications to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A power-driven torque tool with a speed adjustment function, characterized by comprising: The utility model relates to a clutch device (1) for driving screw to drive operation, a reducer (2), a power device (3) for driving the clutch device (1) rotation, a shell (4), a magnetic switch (5), an inductor (6) and a control device (9), the clutch device (1), the reducer (2) and the power device (3) are connected in proper order and are all arranged in the shell (4), the reducer (2), the power device (3) and the inductor (6) are all connected with the control device (9), the clutch device (1) includes the rotation axis (13) connected with the output shaft of the reducer (2), the self-locking sleeve (14) of the front end of rotation axis (13), the washer (11) of the rear end of rotation axis (13) and the cooperation rotation of the reducer (2) and the elastic member (12) around the outer circumferential part of rotation axis (13), the elastic member (12) is arranged between the middle boss of rotation axis (13) and washer (11), the control device (9) includes the first part for detecting and judging the rotation torque of rotation axis (13) and the second part for detecting and judging the rotation angle of rotation axis (13), the first part and the second part are all connected with alarm device, the front end of reducer (2) is equipped with steel ball (21), washer (11) is equipped with annular groove along the circumference, steel ball (21) can roll along annular groove, at least two arc bosses are arranged on annular groove at equal intervals, the reducer (2) is connected with washer (11) through steel ball (21), when the torque of clutch device (1) reaches the preset torque, steel ball (21) jumps off an arc boss and enters the next arc boss, when the rotation torque of clutch device (1) reaches the preset torque, the washer (11) of clutch device (1) can be separated from the output end of reducer (2) and move forward along the axial direction, when the torque of clutch device (1) is lower than the preset torque, washer (11) can reset under the action of elastic member (12), the magnetic switch (5) is arranged on washer (11) and moves axially with it, the inductor (6) is a hall chip, is arranged in the shell (4) and keeps the preset interval with the magnetic switch (5), is used for inducting the magnetic field intensity change caused by the magnetic switch (5) in the process of moving back and forth, and then generates pulse signal transmission to the control device (9). ​ The power device (3) is a driving motor; further comprising a main switch (8) for controlling the rotation speed of the driving motor and a battery (45) connected with the driving motor; the front end of the shell (4) is provided with a front LED lamp (41) for displaying whether the driving motor is in power-on state, the rear end of the shell (4) is provided with a display device (43) for displaying the forward and reverse rotation of the driving motor and a transparent lampshade (42) for protecting the display device (43); when the rotating torque of the clutch device (1) reaches the set torque, the power device (3) automatically stops, when the torque of the clutch device (1) does not continue to rise, the green light in the display device (43) will light up; if the main switch (8) in the working state is released in advance and cannot reach the preset torque, the red light in the display device (43) will light up and an alarm signal will be sent; when the voltage of the battery (45) is lower than the set value, the red light in the display device (43) will flash continuously and an alarm signal will be sent; if the rotation angle value of the rotating shaft (13) is less than the set repeated tightening standard value, it is determined that the repeated tightening is performed and an alarm is sent, the alarm information is that the display lamp is red, the alarm device alarms to remind the operator to overhaul.

2. The speed-adjustable electric impact wrench of claim 1, wherein Further comprising a forward and reverse switch (7) for controlling the forward and reverse rotation of the driving motor, the forward and reverse switch (7) is connected with the control device (9).

3. The speed-adjustable electric impact wrench of claim 1 or 2, wherein The alarm device comprises a display lamp and a buzzer (44).

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