CN207942344U - A kind of electric impact wrench - Google Patents
A kind of electric impact wrench Download PDFInfo
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- CN207942344U CN207942344U CN201820325496.3U CN201820325496U CN207942344U CN 207942344 U CN207942344 U CN 207942344U CN 201820325496 U CN201820325496 U CN 201820325496U CN 207942344 U CN207942344 U CN 207942344U
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Abstract
The utility model is related to a kind of electric impact wrenches.Electric impact wrench includes spanner output shaft, spanner motor and torque control system, and spanner motor is provided with power supply, and spanner motor band wrench output shaft is rotated with fastening bolt；Torque control system includes：Sensor, input module and microcontroller；Microcontroller is electrically connected with sensor, spanner motor and input module respectively；Microcontroller is built-in to control program, and the transformation model of the power torque of spanner motor built in microcontroller, and transformation model is used to the power of input, cycle being converted to corresponding target torque value；Control program is used to calculate real-time torque value according to the working signal that sensor detects, and after equal to preset torque value of taking a seat, starts counting up cycle until the cycle inputted, stops strike.For the utility model in fastening bolt, by two-stage control mode, realization is stepless regulated, reaches preferably assembly torque control accuracy.
Description
Technical field
The utility model belongs to electric wrench technical field, more particularly to a kind of electric impact wrench.
Background technology
Impact type electric work spanner is since light-weight, torque is big, work efficiency is high, countertorque is small, low energy consumption, cheap etc. excellent
Point, it has also become the important tool of production of a large amount of Screw assemblies.However, its assembly torque by operator by being rotated to sleeve
It observes, to the impression of impact sound variation and to holding the feel of spanner to determine whether having reached the torque of requirement, works as operation
Person thinks can be just to shut down, assembly torque is totally dependent on the subjective will and experience of operator.It is reported that experienced
Operator, assembly torque accuracy are can be controlled within scholar 20% (i.e. with the torque dispersion after batch screw element and workpiece assembly
Property).If operator lacks experience or absent-minded, assembly torque can just be talked without precision, and what is had can turn round screw element
Disconnected, some does not tighten screw element.With the upgrading of China's product, the raising of technical merit, enterprise is made increasingly to pay attention to assembling
Quality is to product overall quality, reliability and the influence of safety.
Utility model content
The purpose of this utility model is to provide a kind of electric impact wrench, and in fastening bolt, system is controlled by microcontroller
System, the torque value corresponding to power and cycle and built-in power-torque transformation model using setting reach torsion of taking a seat
After square, then by tally control, until reaching preset torque value and cycle, by two kinds of control modes, it can realize
Stepless regulating reaches better control accuracy.
In order to complete above-mentioned purpose, the utility model discloses a kind of electric impact wrenches, including：Spanner output shaft is pulled
Flashlight machine and torque control system, wherein
The spanner motor is provided with power supply, and the spanner motor band wrench output shaft is rotated to fasten
Bolt；
The torque control system includes：
Sensor, the working signal for acquiring the spanner motor；
Input module, for input power, cycle；
Microcontroller is electrically connected with sensor, spanner motor and input module respectively；The microcontroller is built-in to control program,
And the transformation model of power-torque of spanner motor built in the microcontroller, wherein the transformation model is used for input module is defeated
Power, the cycle entered is converted to corresponding target torque value；The control program when being worked according to spanner motor for passing
The working signal of sensor detection calculates real-time torque value, and after real-time torque value is equal to preset torque value of taking a seat, and starts
Cycle is counted until the cycle inputted, stops strike and simultaneously stop powering for spanner motor.
Further, the sensor includes voltage sensor, current sensor, speed probe, number sensor, electricity
Pressure sensor is used to acquire the voltage signal of the power supply of spanner motor, and current sensor is for acquiring the spanner motor
Operating current signal, speed probe are used to acquire the working speed signal of spanner motor, and number sensor is for counting spanner
The cycle of motor.
Further, the electric impact wrench further includes mechanical switch, and the mechanical switch is connected on spanner motor
On power supply circuit, and the normally opened contact of mechanical switch is connected on microcontroller, and the mechanical switch is for when pressed
So that the power supply of spanner motor is connected, and the signal that mechanical switch is pressed passed into microcontroller when normally opened contact is closed,
So that microcontroller drives spanner motor to start from slow to fast by controlling the control instruction startup metal-oxide-semiconductor that program is sent out.
Further, the voltage sensor is used to the voltage signal for the power supply being collected into passing to microcontroller,
Microcontroller is used for the power difference by controlling program needed for voltage signal and the mathematic interpolation of rated voltage, and then to pulling
The output torque of flashlight machine carries out power back-off.
Further, the current sensor is used to the operating current signal for the spanner motor being collected into passing to monolithic
Machine, microcontroller are used for the acting section of the size discrimination spanner motor according to the current value detected.
The application's has technical effect that：Electric impact wrench, by single-chip computer control system, is preset in fastening bolt
Performance number and cycle value convert out corresponding torque value, reach and take a seat using built-in power-torque transformation model
After torque, then by tally control, until reaching preset torque value and cycle, pass through two kinds of control modes, Neng Goushi
Existing stepless regulating, reaches better control accuracy.
Description of the drawings
Fig. 1 is screw element torque characteristic schematic diagram.
Fig. 2 is impact wrench fastening bolt process torsion-time schematic diagram.
Fig. 3 is the structure diagram of the electric impact wrench of the utility model embodiment.
Fig. 4 is the utility model control flow chart.
In Fig. 1：M torques, ω torsion angles；
In Fig. 2：M torques, M1It takes a seat torque, M2Terminate torque, T time；
Specific implementation mode
With reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by.Many details are elaborated in the following description in order to fully understand the utility model, but originally
Utility model can also be implemented using other different from other manner described here, and those skilled in the art can not disobey
Similar popularization is done in the case of back of the body the utility model connotation, therefore the utility model is not limited by following public specific embodiment
System.
It is all to realize the control to tightening process for a bolt by control mode value to determine torsional impact formula electric wrench usually.
Impact wrench drives the active part of beater mechanism by spanner motor etc., then drives secondary part through gear, and makes spiral shell
Mother rotation and be screwed into screw rod take up the back lash part (nut is not contacted with gasket or screw tip only with thread contact at this time),
Somewhere nut end face is contacted with workpiece surface, and torque increases severely to the slope of corner.More specifically description, such as Fig. 1, impact wrench are logical
Cross motor (and retarder) and drive beater mechanism (by taking ball screw slot beater mechanism as an example) active part (driving shaft, master
Compression spring and active impact block), then the driven part of the drive of the engagement through dental inlay, and nut is made to rotate and be screwed into screw rod and cover sky
Journey OA parts, nut end face is contacted with workpiece surface at A, and torque is acute to the slope (rigidity of screw assembly system) of torsion angle
Increase.
As Μ=Μ o'=1/2*CXod tan α (1)
BOB(beginning of block) is actively impacted to overcome the initial pressure of principal pressure spring and move axially.
As Μ=Μ o=1/2*Cd tan α (Xo+h) (2)
Μ in formula --- torque
Μ o--- start counting up torque
Μ o'--- initial torques
The rigidity of C--- principal pressure springs
The first decrement of principal pressure spring after the assembly of Xo--- beater mechanisms
The engagement height of dental inlay after h--- assembly
D--- helicla flute central diameters
The axial displacement of active impact block makes the dental inlay of it and driven impact block disengage.Punching will be generated after this
It hits, judges that bolt reaches the state of taking a seat with this.
As shown in Fig. 2, whether bolt contacts in fastener cycle, according to nut with gasket or screw tip, it is divided into three
Stage.Starting stage, such as OA sections, nut starts to rotate under the drive for actively impacting part of spanner, at this time nut only with spiral shell
Line contacts, and is not contacted with gasket or screw tip.Load is smaller in tightening process for a bolt at this time, when corresponding torque is with tightening
Between the slope that changes it is smaller.When nut starts to contact with gasket or screw tip, such as A points, load in tightening process for a bolt at this time
It increased dramatically, corresponding torque rapidly becomes larger with the slope for tightening time change, this state is known as the state of taking a seat, this shape of taking a seat
The corresponding torque value of state is known as torque of taking a seat, and active impact portion separately begins to overcome the initial pressure of gasket or screw tip, herein it
Impact will be generated afterwards.After reaching the state of taking a seat, such as AB sections, with nut contact with gasket or screw tip it is constantly close, instead
It is continuously increased to active force so that the effect for continuing impact is gradually reduced.
Since assembly torque is to be accumulated by the torque increment obtained by every Secondary Shocks, therefore some data are referred to as to accumulate power
There is the form of similar exponential curve, the characteristic of this form to be proved by actual tests for square, its external envelope.
In fact, being impacted by enough times, then corresponding economic effect is relatively sufficiently small, and goes to zero, and curve is in saturation shape, at this moment
The gross energy for the work(that the energy that active impact block rebounds in per Secondary Shocks is done plus motor is almost completely converted into the energy of collision
Loss, rebound energy and elastic deformation energy, and tighten nut work done and be approximately equal to zero.Experiment proves, is filled to different screw threads
Match system obtains the number of shocks needed for saturation state, about at tens times to hundreds of times.
Same impact wrench assembles that big specification screw element, heat treated steel alloy screw element, workpiece is smooth nonelastic
When liner, equivalent stiffness is big.Conversely, assembly small dimension screw element, mild steel screw element, workpiece have warpage and flexible liner
When (such as gaskets of copper foil encapsulating asbestos), equivalent stiffness is small.
But for produced electric impact wrench, to change spanner inherent structure carry out Torque-adjusting can only be more
Part is changed, is inconvenient.
For current electric impact wrench, the speed ratio of fastening bolt is very fast, reaches and has soon and accurately controls
System is opposite to be not easy.By changing active axis angular rate, it can effectively change very much the energy of every Secondary Shocks, for the product manufactured
For, change gear ratio and be difficult, but it is convenient to change motor speed, and speed governing is carried out using silicon-controlled phase control of making
It is very simple, and be continuous.
Electric current, voltage, rotating speed, spanner parameter itself of electric impact wrench etc. have shadow to the characteristic of its output torque
It rings.After electric impact wrench completes, spanner parameter itself be it is determining, under different situations electric current, voltage, turn
Speed constitutes its power of motor common influence, is embodied in output torque jointly, thus to electric current, voltage and rotating speed to its
Influence is adjusted as power.
Motor torque：T=9550*P/n
Wherein, T- torques N.M, P- are power kW, and n- is rotating speed r/min
From the above equation, we can see that output torque is inversely proportional with rotating speed.
Power of motor：
Wherein, P- is power kW, and U- is voltage V, and I- is electric current A
From the above equation, we can see that output torque is directly proportional to electric current, voltage.
The power of motor：P1：P=P/ (n1*n2)
Wherein, P- is the efficiency for calculating power KW, n1- as manufacturing machine；N2- is the efficiency of motor, i.e. transmission efficiency
From the above equation, we can see that the power of motor relating to parameters with itself.
Since output torque and rotating speed are inversely proportional, output torque is directly proportional to electric current, voltage, therefore uses power, the work(
Rate can both form the relational model of a continuous power-torque by the different control combinations of electric current, voltage, rotating speed.Pass through
The output torque of motor can be made to change the setting of power.
But these electrical parameters are only controlled, due to speed, it can not accomplish that torque value is very accurate, and power of motor model
It is with limit, in order to reach larger torque value, then using repeatedly strike, adds up torque, to reach certain predetermined torque.It is logical
It crosses the counting to number of shocks and adjusts, cut off the power when setting valve being enabled to reach default target value and stop spanner work, this will
Obtain the very high constant-torque control of precision.
We adjust control methods with number of shocks, are adjusted to the electric wrench of different size, the screw element of different size, difference
Assembly torque under time carried out a large number of experiments, and now partial data is arranged, and the power and cycle by calibration correspond to
Torque value, and be pre-stored in single-chip computer control system, using single-chip computer control system, avoid artificial " precision controlling ".Separately
It is low that one side torque increases slow, last stall torque, does not just allow rapid wear when being used for small dimension screw element for same spanner
Bad screw element also achievees the purpose that expand the specification spanner use scope in this way.
Present embodiment discloses a kind of electric impact wrenches.The spanner motor of electric impact wrench is provided with power supply,
Energy supply control module control powers to spanner motor and microcontroller.Spanner motor is rotated through gear band wrench output shaft
Fastening bolt.The mechanical switch of electric impact wrench is connect with spanner motor, the on/off for controlling spanner motor, machinery
Switch is provided with to be switched on the spot, while can also be controlled it by control system.In the present embodiment, mechanical switch is connected
On the electric power loop of spanner motor, and the normally opened contact of mechanical switch is connected on microcontroller, is pulled when pressing mechanical switch
The power supply of flashlight machine is connected, and normally opened contact is closed passes to microcontroller by the signal that mechanical switch is pressed, and microcontroller passes through control
The control instruction that program is sent out starts from slow to fast at this point, microcontroller starts metal-oxide-semiconductor driving spanner motor.Electric impact wrench
Include voltage sensor, current sensor, speed probe, number sensor etc. equipped with sensor, voltage sensor is for adopting
Collect the power supply voltage signal of spanner motor, current sensor is used to acquire the operating current signal of spanner motor, speed probe
Working speed signal for acquiring spanner motor, for counting spanner cycle, each sensor detects number sensor
Working signal real-time delivery to the control system in microcontroller.Electric impact wrench is additionally provided with an input module, including with
In the power adjustment unit of input predetermined power value, the cycle setup unit for inputting default cycle value is used for
The power for passing through calibration and the corresponding torque value of cycle are pre-stored in single-chip computer control system and demarcate setting unit, is inputted
Module, which has, to be set button plus button, subtracts button, confirming button etc..Electric impact wrench is additionally provided with one for showing that work is believed
The display module of number value and work state information, preferably liquid crystal touch display screen.
The single chip part of electric impact wrench, as its control core, respectively with sensor, mechanical switch,
The electric connections such as input module and display module；The microcontroller is built-in to control program, and the work(of spanner motor built in the microcontroller
The transformation model of rate-torque.Wherein, the transformation model is used to be converted to power that input module inputs, cycle pair
The target torque value answered；The real-time torque value of working signal reckoning that the control program is used to be detected according to sensor, and in reality
When torque value be equal to preset torque value of taking a seat after, start counting up cycle until real-time torque value reach target torque
Value stops hitting and stop to power for spanner motor.
In use,
The first step sets performance number and cycle by input module, passes through the work(of the spanner motor built in microcontroller
The transformation model of rate-torque, you can conversion one corresponding target torque value of output.
Second step is opened by manually opened mechanical switch, or through the microcontroller by built-in control sequence controlled machine
It closes and connects, power supply is made to power for spanner motor, so that spanner motor is through gear band wrench output shaft rotation output
Torque, and drive fastening bolt.
Third walks, and the working signal that each sensor detects the spanner motor passes to microcontroller, by built in microcontroller
It controls program and calculates real-time torque value, and compared with preset torque of taking a seat.
4th step, reaches after taking a seat torque, starts counting up cycle when torque value reaches preset torque value, this
When complete predetermined cycle, stop strike；And by built-in control program can control machinery switch disconnect, or pass through hand
Dynamic opening and closing mechanical switch, it is that spanner motor is powered so that power supply is stopped.
Using the electric impact wrench of the present embodiment, first, in accordance with carrying out traditional tightening work according to torque when work
Industry reaches after taking a seat torque, that is, switches to cycle tally control, until setting cycle is completed, stops strike.
In the utility model implementation process, mechanical switch is connected on the electric power loop of spanner motor, and mechanical switch
Normally opened contact be connected on microcontroller, when pressing mechanical switch, the power supply conducting of spanner motor, normally opened contact are closed machine
The signal that tool switch is pressed passes to microcontroller, the control instruction that microcontroller is sent out by controlling program, at this point, microcontroller starts
Metal-oxide-semiconductor driving spanner motor starts from slow to fast.
In the utility model implementation process, the voltage signal for the power supply being collected into is passed to monolithic by voltage sensor
Machine, microcontroller is by controlling power difference of the program needed for voltage signal and the mathematic interpolation of rated voltage, in turn, to pulling
The output torque of flashlight machine carries out power back-off.
In the utility model implementation process, speed probe detects the rotating speed of spanner motor, which can use spanner
The time expression that motor turns around used, and made with anti-by the decline of the variation constant and spanner motor of spanner mechanical part
Torque linear relationship firmly, is converted into real-time torque.
In the utility model implementation process, current sensor transmits the operating current signal for the spanner motor being collected into
To microcontroller, microcontroller is according to the acting section of the size discrimination spanner motor of the current value detected.Microcontroller passes through detection
Motor output current value does closed-loop current control, realizes constant moment of force output.For motor, by therein under normal running conditions
Electric current is directly proportional to the power that it is exported.The present invention monitors current of electric size by microcontroller in real time, and is converted into spanner electricity
Acc power distinguishes the power output value of spanner motor according to the size of current monitored later, can know in real time so every time
The accumulation of work(caused by strike, work(is exactly the torque accumulated on the screw thread pair hit.This is to monitoring change in torque and finally
It is worth significant.And and declined and the torque of fastening bolt is in a linear relationship reflects torque using spanner motor speed,
Acting section is divided namely after current detecting, its accuracy is controlled using rotating speed.Spanner is detected using speed probe
The rotating speed of motor, the rotating speed can be turned around the variation constant that the time used indicates, and pass through mechanical part with spanner motor
And the decline of spanner motor and the torque linear relationship of reaction force, the electric current, voltage, speed setting one of torque will be influenced
A power utilizes control power, you can by the power-torque relationship model adjusted, be converted into real-time torque.It specifically compares
Can be identical as the existing technology of current control formula electric wrench compared with mode and switch technology, in the preferable work of electric impact wrench
Make in region, torque curve is linear fine with speed curves functional relation, and its conversion constant substantially constant, adds number
Sensor, the technical method can meet the stepless output requirement of tightening torque value.
As shown in figure 4, the electric impact wrench of the utility model is when in use, include the following steps.
S1 sets a power and a cycle by input module, passes through the spanner motor built in microcontroller
The transformation model of power-torque, conversion one target torque value of output.
S2 presses mechanical switch, and the normally opened contact closure signal of mechanical switch passes to microcontroller, which passes through interior
The control program set sends out control instruction, and power supply is made to power for spanner motor, starts spanner motor, so that spanner motor passes through
Gear band wrench output shaft rotates output torque, and drives fastening bolt.
S3, the working signal that sensor detects the spanner motor pass to microcontroller, and microcontroller passes through built-in control journey
Sequence calculates real-time torque value, and compared with preset torque of taking a seat, until real-time torque value reaches torque of taking a seat.It is new in this practicality
In type implementation process, voltage sensor acquires the power supply voltage signal of spanner motor, and current sensor acquires the work of spanner motor
Make current signal, speed probe acquires the working speed signal of spanner motor, and the working signal that each sensor detects is real-time
The control system in microcontroller is passed to, the foregoing Motor torque of control system and the calculating of rotating speed and power of motor are public
The calculation formula of formula and power of motor and voltage, electric current, extrapolates the torque value of spanner motor in real time, takes a seat until reaching
Torque.
S4 reaches after taking a seat torque, and microcontroller control control program switches to cycle tally control, starts counting up electricity
The cycle of dynamic impact wrench；
S5, until cycle reaches the cycle of setting, control program control spanner motor stops strike, and stops
It powers for spanner motor.
Using the electric impact wrench of the present embodiment, first, in accordance with carrying out traditional tightening work according to torque when work
Industry reaches after taking a seat torque, that is, switches to cycle tally control, until setting cycle is completed, stops strike.
It is a power index by the electric current, voltage, speed setting that influence torque, utilizes control power, you can by whole
Fixed power-torque relationship model, is converted into real-time torque.
The torque value of liquid crystal display real-time display bolt fastening is shown on liquid crystal display at this time until bolt fastens
The torque value shown is the torque value of bolt fastening.
Through this embodiment, the stepless adjustable, power supply of spanner strike result, intelligent motor control, spanner working result are automatic
The function of preservation (equipped with industrial interface, can be connected with outside printing, transmission, preservation equipment, have printing, transmission, preserve work(
Can), the control of torque output accuracy, by the technical solution of the utility model, is controlled≤± 10% than simple current component
Method stability is good, strong antijamming capability, meanwhile, this spanner increases voltage compensation module, improves spanner output torque control
Precision processed adds cycle sensor tally control, is entirely capable of accomplishing the stepless accurate clamp screw of wrenching torque.
Obviously, described embodiment is only a part of the embodiment of the utility model, instead of all the embodiments.
It is obtained by those of ordinary skill in the art without making creative efforts based on the embodiments of the present invention
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (5)
1. a kind of electric impact wrench, which is characterized in that including：Spanner output shaft, spanner motor and torque control system,
In,
The spanner motor is provided with power supply, and the spanner motor band wrench output shaft is rotated with fastening bolt；
The torque control system includes：
Sensor, the working signal for acquiring the spanner motor；
Input module, for input power, cycle；
Microcontroller is electrically connected with sensor, spanner motor and input module respectively；The microcontroller is built-in to control program, and should
The transformation model of power-torque of spanner motor built in microcontroller, wherein what the transformation model was used to input input module
Power, cycle are converted to corresponding target torque value；The control program is for sensor when being worked according to spanner motor
The working signal of detection calculates real-time torque value, and after real-time torque value is equal to preset torque value of taking a seat, starts counting up
Cycle stops strike and simultaneously stops powering for spanner motor until the cycle inputted.
2. a kind of electric impact wrench according to claim 1, which is characterized in that the sensor includes voltage sensor
Device, current sensor, speed probe, number sensor, voltage sensor are used to acquire the electricity of the power supply of spanner motor
Signal, current sensor is pressed to be used to acquire the operating current signal of the spanner motor, speed probe is for acquiring spanner electricity
The working speed signal of machine, number sensor are used to count the cycle of spanner motor.
3. a kind of electric impact wrench according to claim 1, which is characterized in that the electric impact wrench further includes machine
Tool switchs, and the mechanical switch is connected on the power supply circuit of spanner motor, and the normally opened contact of mechanical switch is connected to
On microcontroller, the mechanical switch is closed for being when pressed connected the power supply of spanner motor, and in normally opened contact
When the signal that mechanical switch is pressed passed into microcontroller so that microcontroller is started by controlling the control instruction that program is sent out
Metal-oxide-semiconductor driving spanner motor starts from slow to fast.
4. a kind of electric impact wrench according to claim 2, which is characterized in that the voltage sensor will be for that will collect
To the voltage signal of power supply pass to microcontroller, microcontroller is used for by controlling program according to voltage signal and specified electricity
Power difference needed for the mathematic interpolation of pressure, and then power back-off is carried out to the output torque of spanner motor.
5. a kind of electric impact wrench according to claim 2, which is characterized in that the current sensor will be for that will collect
To the operating current signal of spanner motor pass to microcontroller, microcontroller is used for the size discrimination according to the current value detected
The acting section of spanner motor.
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|---|---|---|---|
| CN201820325496.3U CN207942344U (en) | 2018-03-09 | 2018-03-09 | A kind of electric impact wrench |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820325496.3U CN207942344U (en) | 2018-03-09 | 2018-03-09 | A kind of electric impact wrench |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108188968A (en) * | 2018-03-09 | 2018-06-22 | 黄山市星河机器人有限公司 | A kind of electric impact wrench and its control method for assembling torque |
| CN110653745A (en) * | 2019-10-10 | 2020-01-07 | 贵州电网有限责任公司 | Electric remote visual impact wrench and operation method thereof |
| CN113390543A (en) * | 2021-06-30 | 2021-09-14 | 中国铁路郑州局集团有限公司科学技术研究所 | Online torque measurement method and device for controllable torque impact wrench |
-
2018
- 2018-03-09 CN CN201820325496.3U patent/CN207942344U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108188968A (en) * | 2018-03-09 | 2018-06-22 | 黄山市星河机器人有限公司 | A kind of electric impact wrench and its control method for assembling torque |
| CN110653745A (en) * | 2019-10-10 | 2020-01-07 | 贵州电网有限责任公司 | Electric remote visual impact wrench and operation method thereof |
| CN113390543A (en) * | 2021-06-30 | 2021-09-14 | 中国铁路郑州局集团有限公司科学技术研究所 | Online torque measurement method and device for controllable torque impact wrench |
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