A kind of fail-safe system
Technical field
The present invention relates to a kind of fail-safe system that pneumatic gun is tightened, belongs to automotive seat mounting technique field.
Background technology
Aerodynamic moment spanner is widely used in the production of each factory assembling, is mainly used in some torque values in 10NM-
The bolt terminal fastening of 40NM.This pneumatic adjustable wrest fixing spanner has torque precision height (7-10%), and good stability makes
With conveniently, it is easy to safeguard, the features such as moderate.But in modern assembly industry, integrated requirement of the whole system to instrument
More and more higher, needs instrument itself can to carry out effective information transmission and interlocking collaborative work with whole system.Yet with
The reason for this body structure of pneumatic impact spanner, it is clear that this requirement can not be met.This just makes that spiral shell can not be being carried out to aerodynamic moment spanner
State when bolt is fastened effectively is monitored and tracked.Branch company employs pneumatic torque wrench and carries out workpiece in multiple stations
Connection, in use, repeatedly there is bolt no marking, mistake and the quality events such as beat.Other general assembly factories are using aerodynamic moment
During spanner, also all there is situation about being similar to.Because these shortcomings make many factories when tightening tool is purchased, gas is not considered further that
Wrench, is changed to electric torsional control system, so that greatly promote purchase cost.
The content of the invention
The technical problem to be solved is to provide a kind of fail-safe system, for aerodynamic moment spanner it is above-mentioned not
Foot, the aerodynamic moment spanner and whole scene system to using targetedly is analyzed and improved, be allowed to possess and be
The communication function of system collaborative work, can effectively transmit correlation tightens information, under with frock interlocking work, solves bolt leakage
Beat, mistake such as beats at the quality events, greatly improves mistake proofing grade.
In order to solve above-mentioned technical problem, the present invention is adopted the following technical scheme that:
A kind of fail-safe system, it is characterised in that including controller, presets multiple spiral shells on correspondence assembly line in controller
Bolt tightens program and the rifle time for tightening the pneumatic gun of the plurality of bolt;
The position switch detection means being connected with controller control, for detecting bolt to be assembled whether in assembly tooling
On, tighten accordingly program to start;
One detection of gas flow rate device, the detection of gas flow rate device to detect the air flow condition of pneumatic gun,
And by air flow condition signal transmission to controller;
Wherein, after in bolts assemblies frock to be assembled, position switch detection means to controller sends signal, control
Device starts tightens accordingly program;After pneumatic gun is per a rifle has been made, the switching signal on detection of gas flow rate device will can be pressed
Contracting gas flow signals are changed into the normally opened signal or normally closed signal of switch, are then transferred to controller, while controller pairing
Lattice rifle time is counted, and the qualified rifle for being calculated time is compared with the rifle being previously set in controller, when setting rifle
When completely, system sends a qualified signal, unclamps chain frock;It is secondary when rifle is not up to set, it is impossible to remove frock, institute
It is photoswitch that rheme puts closing detecting apparatus, and the detection of gas flow rate device includes air flow chamber, blade, rotating shaft and switch letter
Number, air flow chamber is provided with suction nozzle and outlet nozzle, and air flow chamber is connected to into the pneumatic gun by the suction nozzle and outlet nozzle
Trachea on, the air-flow intracavity places the blade, and blade is connected by the rotating shaft with switching signal, and the controller is
PLC, described controller is connected with alarm device.
Beneficial effects of the present invention:
Using pneumatic torque wrench after the torque value for tightening setting, can be died automatically, even and if now still pressing
The gunlock of spanner is press against, the throughput in trachea is zero this characteristic.System is caught by the trailing edge differential to flow signal
Catch to pour the tight condition of another edition of a book bolt.Then calculated by the bolt of eligible state of the system to having tightened, and be
The rifle for setting of uniting is compared, and when setting rifle time is expired, system can send a qualified signal, the chain work of release
Dress.And when not up to setting rifle, due to assembly tooling and system it is chain, it is impossible to remove frock.If frock is taken in pressure away, it is
System can send warning.
What a kind of fail-safe system of the present invention can effectively transmit correlation tightens information, under the interlocking work with frock, greatly
The big probability of happening for improving mistake proofing grade, significantly reducing no marking accident.
Description of the drawings
Fig. 1 is a kind of system construction drawing of fail-safe system of the invention;
Fig. 2 is the principle schematic diagram. of detection of gas flow rate device;
Wherein, 1, blade;2nd, switch;3rd, into the air of air flow chamber;4th, into the air of pneumatic gun.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate this
Invention rather than restriction the scope of the present invention.In addition, it is to be understood that after the content for having read statement of the present invention,
Those skilled in the art can make various changes or modifications to the present invention, and these equivalent form of values equally fall within this Shen
Please appended claims limited range.
Embodiment one, as shown in figure 1, a kind of fail-safe system, for the production system of automotive seat in, including controller,
Multiple bolts on correspondence assembly line are preset with controller and tighten program and for tightening the pneumatic of the plurality of bolt
The rifle of rifle;
The position switch detection means being connected with controller, for whether detecting bolt to be assembled in assembly tooling,
Tighten accordingly program to start;Simultaneously this signal or bolt tighten the activation letter of initialization and the reset of cycle of operation
Number;One photoswitch by the device in assembly tooling, for detecting bolt to be assembled whether in assembly tooling, so as to
Program is tightened accordingly in startup;Simultaneously this signal still originally tightens the activation signal of initialization and the reset of cycle of operation.Account for
Signal output is 1 during position, and signal output is 0 during room.
Detection of gas flow rate device, the flow regime signal of the compressed air to detect pneumatic gun;Once close per having beaten
After the rifle time of lattice, the switching signal on detection of gas flow rate device can transmit a signal to controller, and controller is to qualified rifle
Counted;
Wherein, after in bolts assemblies frock to be assembled, position switch detection means to controller sends signal, control
Device starts tightens accordingly program;After pneumatic gun action, the switching signal on detection of gas flow rate device can be by signal transmission
To controller, while controller is counted to qualified rifle time, and by the qualified rifle for being calculated time be previously set in controller
Rifle is compared, and when setting rifle time is expired, system can send a qualified signal, unclamp chain frock;When not reaching
To setting rifle, it is impossible to remove workpiece.
Further, the position switch detection means is photoswitch.
Further, the detection of gas flow rate device is made up of air flow chamber, blade, switching signal, and the blade is placed
In the air-flow intracavity, air flow chamber is provided with suction nozzle and outlet nozzle, and air flow chamber is connected to by the suction nozzle and outlet nozzle
On the high pressure gas pipeline of the pneumatic gun, the blade is positioned over the air-flow intracavity, and switching signal is located above air flow chamber, uses
Whether finish in Detection task, when controller detects bolt tooling to be assembled, now the flow direction of air-flow is Jing air flow chambers
To pneumatic gun, when air flow chamber has air-flow to pass through, the rotation of the blade of air-flow intracavity makes switching signal become normally closed by normally opened, when beating
After a complete rifle, now, can die automatically after moment of torsion because pneumatic gun reaches, pneumatic gun can not action, the blade in air flow chamber
Can not rotate or rotary speed is slower, switching signal becomes normally opened by normally closed.The flow status of gas are transformed into into switch
Signal it is normally closed or normally opened, by the logical calculated of the signal of switching signal and rifle signal, so that controller is to the spiral shell tightened
Bolt state carries out selective mechanisms.
As the presently preferred embodiments, controller adopts PLC in the present invention, if further cost-effective, it is contemplated that adopt
Single board computer is controlled.PLC carries out timing monitoring to the working time of switching signal and pneumatic gun(During the work of monitoring pneumatic gun
Between be switching signal from normally closed to normally opened), if count once while thinking that a rifle having been beaten if meeting condition, the number of times of counting
Then think that bolt tooling task to be assembled is completed when identical with the number of times of PLC settings
For continuously tightening on same bolt, may cause to repeat the problem of metering, it is anti-to pneumatic torque by system
Identification between seasonable effectively avoids the generation of error count time.Specifically:Each qualified rifle time is pre-set in controller at least
The time of needs;When pneumatic gun compares per the duration of ventilation that the pneumatic gun is calculated after having beaten once and with the time in controller,
It is to repeat to beat on same bolt if the time is less than the setting time, is otherwise new qualified rifle.