CN1128981A - Controlling system for glass sheet press bender - Google Patents

Abstract

A closed loop control system for a hydraulically actuated glass sheet press bending platen. Flow of fluid supplied to the cylinder operating the press platen is controlled through a servo solenoid valve. A linear motion transducer associated with the platen and sends appropriate signals to a programmable motion controller. The motion controller controls a position module operatively coupled to a servo solenoid valve which regulates the flow of hydraulic fluid from a pump to the cylinder. The motion controller utilizes data from the linear motion transducer for making necessary corrections to insure that the platen cycles precisely in accordance with a predetermined program. In a second embodiment of the invention, the closed loop control system for the hydraulically operated platen is combined with a variable speed glass sheet conveyor means for improved registry of the glass sheet being bent with the platen member.

Description

The Controlling System of glass sheet press bender

Background of invention

The intersection of related application referring to

The application is on April 15th, 1994 with name, title " glass sheet press bender Controlling System ", the sequence number of Jennifer R.Wolfe, AllenT.Enk and Robert G.Revells is the continuation of the part of 08/228,121 common unsettled U.S. Patent application.Described common pending application quilt is incorporated by reference especially, but does not repeat.

2. field under the present invention

The present invention relates generally to the press-bending of sheet glass, more particularly, relates to a kind of press bending apparatus that adopts a kind of hydraulically operated platen that cooperates with a loop hydraulic control system.

3. the description of prior art

Vehicle now, for example automobile and similar vehicles generally all adopt sheet glass crooked or curve to seal as glass.The curvature that this glass must be curved the profile of car body opening and the desired accurate qualification of size just can reach the quality standard of automaker's strictness.In addition, Wan Qu sheet glass must have the consistent government that set up and the superior optical quality of industrial standards of meeting.The bend glass plate that this preparation is used for automobile side-window and rear window usually by hot tempering to increase because the opposing of the damage that collision causes, if and made glass broken then be broken into relatively little nothing harm particle, these would be different with the big uneven fragment that common not tempered glass is broken into.On the other hand, if sheet glass is used to for example production of windshield, after bending, carry out suitable anneal to glass.

According to a kind of technology of producing this bend glass plate that is widely used at present, sheet glass is heated to its softening temperature, the remollescent sheet glass that between the complementary molded surface, will be heated the then required curvature of bending.After the press-bending,, perhaps gradually it is cooled to temperature under the annealing range so that its annealing with a kind of control method for tempering is cooled to the sheet glass of bending temperature below the one ANNEALING OF GLASS scope rapidly with a kind of control method.In both cases, be preferably on the conveyer system and carry out continuously when advance in a horizontal channel one substantially continuously at sheet glass, this horizontal channel comprises a heating zone, a buckled zone and a tempering or annealed zone in succession.Be input to the heat of on each sheet glass it being taken to suitable flexure temperature at first and also be used for last heat treatment operation.

The complementary profiled surface that sheet glass is shaped to required bending betwixt is provided on the top or following top, bottom casting die or pressing plate of tangential movement passage of the sheet glass that is usually located on the conveyer system.Sheet glass is admitted to the position between top, the bottom casting die, this relative casting die can be toward each other and dividually relative movement so that sheet glass is pressed into desired shape.Preferably adopt a hydro-cylinder that is generally ordinary construction upwards to promote the bottom casting die, promote an appropriate localized warmed-up sheet glass,, and be pressed on the complementary profiled surface relative or the top casting die away from this horizontal channel with contact and from delivery system.Hydro-cylinder withdrawal bottom casting die drops to crooked sheet glass and sends bending area on the delivery system then.

Aborning, because sheet glass is crooked one by one, therefore make them obtain a uniform shape all the time and the deleterious defective that do not have the inconsistent operation of the sort of bulldozer to cause is very necessary.Upper and lower casting die can frequently be changed and produce difform sheet glass, and wish to reduce to change and to begin different parts and produce required times, and stoppage time and loss turnout are reduced to minimum.Should be stably and be speed from the motion that is recycled to the round-robin mould, to guarantee that sheet glass is from being recycled to the circulation gravity and the pressure that are equated with control.

The common employing in the hydraulic efficiency system in glass bends operation up to now connects the hydro-cylinder that is coupled to the bottom platen and is configured in the so-called open system in the operation.This system can by one comprise one by electromagnetic control " platen upwards " and the loop of the pump that links of " platen is downward " flow control valve and hydro-cylinder form, the upstream in this loop has the flowrate control valve that a cam and plunger are operated.Begin the circulation of bending, a programmable logic controller sends a signal to the platen magnetic valve that makes progress, and carries full hydraulic coupling to the platen cylinder.Upward stroke speed is to be determined by the flowrate control valve that platen makes progress in the loop.The translational speed of sheet glass is not excessive when sheet glass is pressed in patrix, and because one of do not make shake from stopping suddenly at a high speed, this is very important when lower platen arrives its uppermost position in fig-ure.For this reason, in selected some moment in upward stroke, the cam-operated plunger that subtracts on the stream valve subtracts the flow that the stream valve reduces the hydraulic fluid of delivering to the platen cylinder again.Platen continues to move upward with a speed that reduces, until the terminal point that reaches oil cylinder stroke.

When press-bending was finished, programmable controller was the downward magnetic valve making current of platen.Full hydraulic coupling is sent to the platen cylinder, and platen moves downward until a normal upper/lower positions that reaches on the programable limit switch.Limit switch sends a signal and makes downward closed electromagnetic valve then.In case closed electromagnetic valve, platen can continue to move downward a moment, certain below arriving " down normal " position a bit just stops, and this is because the magnetic hysteresis of system.This point is for a given temperature, thereby is constant for given hydraulic fluid viscosity, but can change along with the variation of fluid temperature (F.T.).The top dead center of bottom platen, promptly sheet glass is pressed in the top casting die by the bottom casting die and the limes superiors of stroke when bending is constant, because this position is the end at platen cylinder stroke.

When heated sheet glass was sent into bending station on the transfer roller roller, its leading edge contacted regracting backstop, and these backstops are limited in by the bottom casting die sheet glass from position that the transfer roller roller promotes.In order to reduce to minimum in the potential loss by the retention period of the sheet glass of backstop on the transfer roller roller that separates, the circulation of bottom casting die is very consistent with the motion of the sheet glass of being delivered to the position by the running roller of transfer roller to be very important.Adopt existing system, as what point out above, because the variation of the sum of errors hydraulic oil temperature of programmable limit switch, platen downward or low stop place in bottom changes.In addition, the different flow controls and the adjusting of cam position are the problems of subjective judgement, can be because the operator makes this part adjust differently with production even this class of that part with the production of that class with the sensation difference of his or her operation.These factors cause the localized variation of bottom stop of bottom platen, and this has just caused the difference of the residence time of the glass on the unfavorable running roller.Certainly, lower causes the residence time longer to upper/lower positions, higher to upper/lower positions then the residence time shorter.

The present invention's summary

According to the present invention, above-mentioned prior art problems is to solve by the hydraulic control system that adopts a kind of loop.Offering hydro-cylinder operates the flow of hydraulic fluid of bottom platen and is controlled by a servo electromagnetic valve.One Linear displacement transducer that links with the bottom pressing plate constantly monitors the position and the speed of this platen, and transmits the signal of corresponding this position of indication and speed to a programmable motion controller.This motion controller makes the predefined procedure circulation of bottom platen according to motion control program by an operator interface.For this reason, the position control sheet that links of the guiding valve of motion controller order one and servo electromagnetic valve.The servo electromagnetic valve re-adjustment is from a hydro-pump to hydro-cylinder or the liquid of actuator fluidic flow.Linear displacement transducer provides lower stage Board position and velocity information to the programmable movements controller, and the programmable movements controller utilizes this information to carry out necessary correction, circulates according to preset program to guarantee platen and the bottom casting die on it.

The accompanying drawing summary

Fig. 1 is the partial side view that implements a bending of the present invention and tempering equipment, and illustrates hydraulic control system;

Fig. 2 is the sketch of Fig. 1, shows an add ons that adds in the second embodiment of the present invention;

Fig. 3 is a more detailed sketch of magneticsensor shown in Figure 2 and being used to of linking controlling the equipment of conveying belt roll speed;

Fig. 4 is a graphic representation, shows the press-bending round-robin curve that carries out according to method of the present invention;

Fig. 5 one shows the schema of the series of steps that is used for method of the present invention;

Fig. 6 is a schema, shows the used additional step of method of the present invention;

Fig. 7 is a schema, shows the series of steps of the step of the speed that comprises the correction lower stage plate that is shown in Fig. 6 and position;

Fig. 8 is a schema, shows the series of steps of the step that comprises the correction position that is shown in Fig. 6 and timing value.

Be appreciated that the setting that the invention is not restricted to adopt shown structural parts of accompanying drawing and parts,, and put into practice in a different manner and carry out because the present invention can have other embodiment within the scope of the claims.Should also be understood that word and the term quoted are in order to describe rather than to limit here.

The description of preferred embodiment

The present illustrated embodiment that at length provides in reference to the accompanying drawings.There is shown a kind of bending and the tempering equipment that are used to produce crooked and tempered glass sheet with label 10 expressions by successive processes.The sheet glass that is bent is carried along a pre-routing of passing a heating zone, a buckled zone and a heat-treatment zone in succession, and these zones are adjacent to each other, thereby sheet glass passes next zone at once from a zone.For this reason, equipment 10 comprises a conveyer system 12, be used to support one of a series of sheet glass-S then one pass a heating zone 14, a bending station 16 and a heat treatment station 18 (being a tempering section) here along a predetermined passage.Each section 14,16 and 18 termination end ground are along the passage setting, thereby the remaining later on hot surplus of bending glass sheet can be used for the thermal treatment purpose.For bending station provides a programmable operating system, with label 20 diagrams.

Though the present invention illustrates bending station and connects a tempering section, is appreciated that if the production sheet of annealed glass then also can adopt an annealing section to replace the tempering section at heat treatment station 18.

Mode with a kind of control heats when sheet glass S is transferred when comprising a stove 22 of heating zone 14 usually, and this heating zone is on the conveying roller 24 of a part that faces with it, constitute delivery system 12.Can adopt the stove of any service form, generally can adopt as shown in the figure comprise one by top 28 heating chambers that limit 26, a diapire or base plate 30, relative sidewall 32 and the continuous tunnel furnace (tunnel-typefurnace) of an end wall 34.Heated chamber 26 is by suitable heating unit, and for example gas burner or resistance heater (not shown) are arranged on top, bottom and sidewall and heat, and suitably regulates and provide the ideal type of heating to passing the sheet glass that moves in it.Sheet glass S is carried on the conveyor rollers 24 of conveyer system 12 by heating chamber 26, and delivery system is extended from the inlet end (not shown) of the stove that passes the opening 36 on the end wall 34.Sheet glass is transferred and is heated to its softening temperature when passing stove inner control temperature environment basically.In case come out of the stove from opening 36 1, the heated glass plate is just received by the second series conveying roller in the bending station 16 38, sends into bending station 16.The heated glass plate is carried on the roller 38 between the relative upper and lower casting die 40 and 42, and upper and lower casting die 40 and 42 makes the bending that glass forms to be needed, and this will be described in the back.

After the bending, sheet glass is carried on another series of rollers 44 along transfer roller 12 and is passed heat treatment station 18.Though roller 38 and 44 is illustrated as linear or straight structure, wish it also can is curve mandrel and the rotary sleeve cartridge type that generally is used to carry twisted plate, for example in U.S. Patent No. 4,015, disclosed in 968 and 4,167,997.At tempering station, crooked sheet glass is carried between upper and lower air blast 46 and 48.The air blast head has some pipes 50 and 52, operationally is provided with relative cooling fluid flow, is generally air or analogue, the guiding towards or aim at along the opposite face of the moving sheet glass of transfer roller.

Again specifically, press-bending station 16 comprises that one is as general as the skeleton 54 of orthogonal parallel tubular shape.This skeleton comprises axial corner post 56, and its top is being connected longeron 58 and crossbeam 60 with the bottom.The roller 38 of bending station and 44 is driven with a kind of common mode (not shown) and is installed on the skeleton.Upper and lower casting die 40 and 42 is installed in the reciprocal relative movement of doing toward each other and separating in the skeleton 54 respectively.Have the crooked consistent relative complementary drip molding that will curve on top, the bottom casting die with sheet glass.

Top or positive casting die 40 comprise that typically one is stated from the drip molding 62 on the platen frame 64.Though do not limit so, top sun drip molding be as shown in the figure so-called continual or successive type comprise a successive have one with the bottom yin shaping up body horizontal stripe group complementary structure of bottom casting die 42.The structure of platen frame is preferably can be in selected vertical position adjusted, so that make glass workpiece bend to different degree between two relative casting dies.For this reason, each place, angle in skeleton 54 of platen frame 64 is operatively connected with the lower end of screw thread back shaft 66.This screw thread back shaft is received in the rotatable bearing 68 that is stated from the spiral supporting seat on the shelf that is made of the beam on the top of skeleton 54 58 and 60 spirally.Also be loaded with a motor drive unit 72 on the top of this shelf, be suitable for rotatable drive shaft ring 68 simultaneously,, thereby correspondingly improve or reduce platen frame 64 and its drip molding that is carried 62 so that draw back or projecting shaft 66.

Bottom or cloudy casting die 42 are mounted to when each bend cycles is carried out, and promptly are in vertical reciprocating motion when roller 38 is mentioned and be pressed in drip molding 62 when each sheet glass.For this reason, this casting die 42 comprises a supporting body, and totally with 74 expressions, this supporting body comprises one 76, and a base plate 78 is housed above for it.One shaping horizontal stripe group 80 is installed on the base plate by union lever 82 and is spaced from.Shaping horizontal stripe group as shown in the figure is so-called circumferential annular, and profile is consistent with the sheet glass S that will be bent, and is made of a series of segments that separate of crossing its two ends, thereby can be upward through between roller 38 and mention a sheet glass from transfer roller.Certainly, roller also can be other known structure, and for example U.S. Patent No. 5,178, the roller of the bending in 660, and this roller bends downward into below the end of shaping horizontal stripe, and the horizontal stripe that therefore is shaped can be a continuous loop.But also understand easily, in crooked and Equipment for Heating Processing, can be equipped with a reciprocal transporting mechanism (not shown), for example in U.S. Patent No. 4,883, the sheet glass that receives and transmit bending of disclosure and description in 526.

Provide one overall to be concave panel 84 on the face up of shaping horizontal stripe 80, it with the forming face of top drip molding 62 with opposite relation complementation.In order to guarantee that platen frame 64 and bearing part 74 move along an accurate vertical channel easy on and off in skeleton 54, are equipped with roller on its each angle and roll guiding element 86.Guiding element comprises the carriage 88 on the angle of being fixed in platen frame 64 and supporting body 74.Be loaded with the roller that separates installed on each carriage to 90, rolling with fixed rail plate 92 on the face of the adjacent angled setting of relevant corner post 56 engages orthogonally.Like this, platen frame and supporting body maintain no transverse movement firmly, and can move along a vertical channel is freely upper and lower.

As what so far explained, the shaping horizontal stripe group 80 of a contour structure or ring structure is housed on the bottom casting die 42, this shaping horizontal stripe group is in the rest position under the roller 38 usually.One heated glass plate S can be transported on the roller this casting die above the position, thereby the bottom casting die can promote sheet glass from roller, compress top drip molding 62, sheet glass returns roller 38 and 44 again then, perhaps for example sends bending station 16 by above-mentioned reciprocal transporting mechanism (not shown).

For each sheet glass between top, the bottom casting die 40 and 42 is located exactly, a pair of steady arm backstop 94 that is spaced laterally apart is set on the passage of the progressive sheet glass between one of adjacent roller 38 and 44.Each steady arm backstop is fixed on the far-end of a piston rod 96 of the fluid actuating cylinder 98 on the substrate 78 that for example is installed in supporting body 74.Can operate these cylinders, it is moved between raised position on one and is lower than the lower position of sheet glass S progressive passage selectively, raised position on this, these cylinders reach and enter on the conveying roller 38 in this sheet glass S progressive passage.Substrate 78 is stated from the bed 76 of supporting body 74, thereby moves up and down together with one.

One hydro-cylinder 100 is installed in supporting body 74 times rightly, on the beam 58.This cylinder comprises that a far-end is connecting the piston rod 102 of the bed 76 of supporting body 74.Piston rod can extend axially and shrink, and it is operated making the to-and-fro movement between its contraction or a low level and a high position of the cloudy casting die 42 in bottom like this.At punctured position, shaping horizontal stripe group 80 places roller below 38, thereby sheet glass can enter the position of its top and contact with steady arm backstop 94.When piston rod stretches, shaping horizontal stripe group 80 moves upward, pass the bed of roller 38, warmed-up sheet glass is promoted and compress top casting die 40 between the forming face 84 of the forming face of complementary male part 62 and shaping horizontal stripe group 80 from roller, it is configured as a bending of being scheduled to.After bending is finished, piston rod 96 is drawn back to reduce supporting body 74, thereby withdraw on it shaping horizontal stripe group 80 and be placed into the sheet glass of bending on the conveyor rollers 38 or on other transporting mechanism, for example above-mentioned reciprocal transfer system is so that remove it from bending station 16.

As shown in fig. 1, the programmable system 20 that is used to operate bottom casting die 42 comprises that one is applicable to the hydro-pump 104 that suitably drives that receives hydraulic fluids from a fuel reserve tank 108 through a pipeline 106.This pump 104 provides hydraulic fluid with pressure by a pressure feed pipeline 110 to a servo electromagnetic valve 112.Servo electromagnetic valve can be selected the Corporation from ParkerHannifin for use, and (Elyria, the trade mark of Ohio44035) buying are the sort of of serial D31FH to Hydraulie Valve Division.

The pipeline 114 and 116 that valve 112 is controllably regulated near-end through being connected in cylinder pressure 100 respectively and far-end flows into and flows out the flow of the hydraulic fluid of cylinder pressure 100.Specifically, pipeline 114 supplies of the near-end of hydraulic fluid through leading to the cylinder body under the piston that is connected in piston rod 102 promote bottom casting die 42.Simultaneously hydraulic fluid is discharged cylinder body and through pipeline 116 return solenoid valves from far-end above piston, thereby and gets back to fuel tank 108 through a Returning pipe 118.For will drawing back the bottom casting die, servo electromagnetic valve 112 is directed to the far-end of the cylinder pressure 100 on the piston with hydraulic fluid by pipeline 116, fluid below piston by the road 114 and magnetic valve turn back to oil tank 108.

Send corresponding signal for the position that monitors supporting body down or platen 74 continuously and speed and to Controlling System, a Linear displacement transducer is provided, indicate with 120 generally.This Linear displacement transducer for example can suitably be selected a kind of TEMPOSONICS II type that can buy from MTS System Co., Ltd (Box 13218, Research Triangle Park, North Carolina 27709) for use.Especially, this Linear displacement transducer comprises that one is contained in the static sensor element 122 on the holder part 124 of a corner post 56 that is fixed in skeleton 54 for example.Making a linear probe 126 of this sensing member be suitable for axially being fixed on magnet ring on the holder part 130 that is loaded on supporting body 74 from one passes and stretches out.Therefore, when holding when wearing body or bottom platen 74 to-and-fro movement vertically, linear probe 126 correspondingly passes magnet 128 to returning and axial motion forward, produces the indicator signal of position, direction of motion and the speed of a bottom carrier.

This Linear displacement transducer always can highly precisely be measured the position and the speed of bottom bearing part, and for example position measurement is in one-thousandth of an inch.The signal that sends from sensing member 122 is sent to a programmable movements controller 134 by a circuit 132.It is a kind of model of TMC 188/40 that this motion controller can suitably be selected the trade mark for use, can be from Delta Computer Systems Inc, Industrial Electronics Control (11719 NE 95th Street, Suite D, Vancouver WA 98682-2444) buys.This motion controller comprises that by a circuit 136 and the generic interface unit 138 of an operating console and programming input system links.

One position module 140 is accepted speed command signal and is sent corresponding spool position instruction signal through a circuit 144 to servo electromagnetic valve 112 by a circuit 142 from motion controller 134.The feedback signal of indication actual servo spool position is delivered to position module 140 from valve 112 through a circuit 145.

Utilize closed-circuit system of the present invention, setting point (setpoint), i.e. the program of Yu Ding bottom supporting body or platen operation enters by operator interface unit 138, and casting die is prepared operation.One warmed-up sheet glass S enters the position on the roller 38, and computer unit 138 sends order upwards.Servo-valve is arranged on the position that bottom supporting body or platen 74 are moved upward with the predetermined speed by motion controller 134 instructions.The determining positions of servo electromagnetic valve 112 speed of platen, is monitored by 134 pairs of these positions of computer, and the actual speed of this target velocity with the platen 74 that is recorded by Linear displacement transducer 120 compared.In case of necessity, position module 140 is moved with predetermined speed according to program to guarantee platen according to the position of adjusting servo electromagnetic valve from the signal of motion controller 134.

When Linear displacement transducer 120 is measured the platen that moves upward and is arrived its round-robin decelerate position, motion controller 134 sends signal to position module 140, make it servo electromagnetic valve is set reducing the flow of fluid, thereby platen speeds is dropped to predeterminated level to cylinder 100.Motion controller by Linear displacement transducer and programming monitors and suitably proofreaies and correct platen speeds constantly.When platen arrives top dead center is again as being monitored out by linear-movement pickup, at this moment its motion being stopped.Because the levels of precision of transmitter, platen can obtain the stop in the high precision scope of 0.001 inch (0.025mm) magnitude all the time, can not make piston in cylinder on earth.After the dead time of choosing, motion controller sends signal to position module, and servo electromagnetic valve is set, and makes piston rod 102 withdrawal and platen is moved downward with a selected speed.The speed of platen and position are monitored that by linear transducer 120 the platen response stops in predetermined lower dead center exactly from the corresponding signal of linear-movement pickup, waits for that next round-robin begins.

Find, when above-mentioned loop hydraulic efficiency system is used for the second embodiment of the present invention, its advantage particularly advantageous, this embodiment comprises in conjunction with this closed loop hydraulic efficiency system to come operation upper part and lower stage plate, the part of conveyor rollers 24 formation variable velocity delivery systems 12 with the controlled and accountability to the motion of the sheet glass on the conveyor rollers 24 that faces that increases.

Second embodiment that implements a kind of structure of the present invention with reference to figure 2, illustrates in the mode of sketch.In the present embodiment, operator interface 138 is connected with programmable logic controller (PLC) 135.Because a programmable logic controller is preferentially selected in the attachment of a task that need finish for use.As before, hydro-cylinder 100 and servo-valve 112 hydraulic link, servo-valve 112 connects with servo controller 146.Stop device 94 also is by PLC 134 operations.In addition, a photocell eye 144 links to each other with PLC.

One variable-speed drive motor (Fig. 3) 148 links by axle 150 and at least one second conveyor rollers 38.One device indicating, for example the gear 38A (shown in Fig. 3) with serration is loaded on output shaft 150.The motion of tooth produces the pulse that is provided to motor speed controller 158 through electromagnetic sensor 156.Motor speed controller can be selected for example " M-Trim " of the Industry Control company that confusingly the receives manufacturing of Minnesota State Ronald Grover horse bohr for use.Motor controller 158 links with motor driver 159.Motor driver 159 and link to each other with motor 148 and to form a control loop.

Gear 38A has a predetermined number of teeth, and transmitter 156 just produced a pulse when whenever next tooth was through electromagnetic sensor 156.Because the space of teeth of gear is accurately set, the number of teeth will be relevant with the position, angle, will be relevant with the circular frequency or the speed of second conveyor rollers 38 to the speed of its counting.Utilize this information, motor speed controller 158 combines the speed that just can very accurately control conveyor rollers 38 with PLC 135.

, except offering motor speed controller 158, want purpose of description for the back and also will offer the counting mechanism that comprises a numbered card (not shown) among the PLC 135 from the pulse of Magnetic Sensor 156.PLC 135 can provide signal to motor speed controller 158 similarly.

In addition, other speed-changing driving device, for example a servo driving controller also can be used to drive conveyor rollers.

In an embodiment of the present invention, servo electromagnetic valve 112 is one 0 overlap valves, and it can be that the model that the Bo Shilei Xinji group of for example Wisconsin State thunder suffering makes is the Bosch Racine servo electromagnetic valve of NG-6.Preferred 0 overlap valve that adopts in the second embodiment of the present invention is because it has eliminated the pulsation effect that other valve produced.But also can select other servo electromagnetic valve for use if desired, comprise previously described.If desired, servo controller 146 can be identical with programmable movements controller 134.

With reference now to Fig. 4,, almost infinitely plant a kind of graphic representation in the circulation of platen or bottom casting die 42 shown in the figure, these circulations can be programmed among the PLC 135 in advance by operator interface 138.Shown particular cycle is used for crooked windshield glass, and curve is the curve of the time of signa to the position of the bottom casting die 42 of one-thousandth of an inch.The operator passes through operator interface 138 with " wait " position or first predetermined position (A), CAM or deceleration or second predetermined position (B), Dwell (pause) 1 or the 3rd predetermined position (C, D) and Dwell (pause) 2 or the 4th predetermined position (E, F) are input among the PLC 134.The operator is also by operator interface 138 inputs one first that be scheduled to or make progress speed or speed, one second that be scheduled to or CAM speed or Dwell (pause) 1 speed or speed, one the 3rd that be scheduled to or Dwell (pause) 2 speed or speed and one the 4th predetermined downward speed or speed.Also be will purpose of description, will import a number one pulse " operator presets 1 " and one second and feel the pulse and dash, or " operator presets 2 ".

The people who is familiar with this area should be understood that this press-bending circulation is to be used to the example of bending windshield glass, and it just can be by almost one of unlimited diverse circulation of operator's pre-programmed.Can be on demand to other position or speed programming.For example platen or bottom casting die can be reduced to starting point or " waits " below the position when the parts of crooked certain shape, while reciprocal transportation device after bending finishes is removed windshield glass under the casting die of top.The bottom casting die needn't drop to the position below the starting point when using certain reciprocal transportation device.When other parts except that windshield glass of bending, can not use a Dwell (pause) 2 positions and a Dwell (pause) 2 speed.Therefore, the familiar personnel in this area are appreciated that this program capability helps constructing the extremely diversity in the glass bending field.

With reference now to Fig. 5-6,, will carry out very detailed description to the operation of present method and equipment.When bending circulation beginning (frame 200), several things take place substantially simultaneously.Whether computer starts check system (frame 205).If system does not start, will start servosystem (frame 210), and bottom pressing plate or casting die 42 will be moved to first predetermined or " wait " position (frame 215).

Whether computer inspection simultaneously, (frame 220) is surveyed by photocell eye 144 during along conveyor rollers 38 operation with one first predetermined speed as sheet glass S.When detecting a sheet glass S, light eye 144 will send a signal to PLC 135.PLC makes backstop 94 lift numbered card (not shown) among (frame 225) and the PLC135 to begin pulse counting that Magnetic Sensor 156 is sent then.

Explain as earlier in respect of figures 3, the tooth of each gear 138A through near Magnetic Sensor 156 places the time, Magnetic Sensor 156 countings pulses.These pulses offer the numbered card among motor speed controller 158 and the PLC 135.As shown in Figure 5, make a decision of about whether the speed of second conveyor rollers 38 being changed into second predetermined speed or " wriggling " speed from first predetermined speed.Numbered card is made comparisons institute's counting continuously with " operator presets 1 " value.Second conveyor rollers 38 will continue the speed rotation with conveyor rollers 24, up to reaching " operator presets 1 " value (frame 240).At this moment PLC 135 provides a signal to the first/the second state switch of motor speed controller 158.Controller begins the pair roller deceleration automatically according to the program that the operator imports motor speed controller 158.This is to provide a signal by motor driver 159 to motor 148, and motor 148 is pivotally attached to the axle 150 of second conveying roller or roller 38 and realizes.

When this deceleration was carried out, motor speed controller was independent of PLC 135 and works, but Magnetic Sensor 156 is still to the numbered card transport pulse.Computer checks continuously whether counter pulse reaches " operator presets 2 " value.The circulation of bending when reaching " operator presets 2 " value will be activated (frame 255)." operator presets 2 " value is selected in judgement according to the operator, reaches " wriggling " speed when making the press-bending loop start, and sheet glass will be calibrated between the platen spare of upper and lower.This needs some judgements of operator's this respect.

When numbered card had had desired count number, it started the circulation (frame 255) of bending, and the press-bending round-robin starts makes press-bending program (260) beginning.Backstop 94 is fallen during the press-bending loop start, and counter is reset (238).Extremely described the press-bending program among Fig. 6 in detail.

As previously mentioned, system is activated (frame 205) when circulation (frame 200) beginning, and platen is moved to " wait " position (frame 215) by hydro-cylinder 100.The loop system that the front was described utilizes information (frame 283) that linear transducer 122 offers servo controller 146 continuously " wait " position of requiring and actual " wait " position to be compared (frame 284).Whether correctly servo controller 146 constantly inquires position (frame 286), if the position is also correct, receives that again the umber of pulse that indication is counted by the numbered card among the PLC 135 equals the signal of " operator presets 2 " value, then starts the circulation (frame 260) of bending.If malposition then system are in the tram by frame 215,284,286 circulations up to platen.

Move program shown in Figure 4 according to the value that the operator enrolls in the operator interface 138 in advance, under the control of servo-valve 112 and servo controller 146, hydro-cylinder 100 promptly to make progress or first predetermined speed lifting bottom casting die 42, arrives indicated first preset deceleration or the CAM position of B point among Fig. 3 up to it.When bottom casting die 42 with upward velocity when move in the CAM position, the loop hydraulic control system constantly detects the speed and the position of platen.

Between servo controller 146 is constantly ask its position data that provides by the measuring apparatus that links to each other with servo electromagnetic valve 112 by monitoring: " speed is correct? " adjust and repeat queries if speed is incorrect.As shown in Figure 7, correctly whether systemic circulation detection speed (frame 270A), inquiry speed (frame 270B), and the governing speed if speed is incorrect (frame 270C) obtains affirmative reply up to inquiry.At this moment, servo controller 146 by inquiry " correct position? " (270E) come detection position (frame 270D).If malposition, system turns back to frame 270A, and speed will be detected again there.

This flow process is proceeded, and the detection up to speed and position indicates bottom casting die 42 in-position B.At this moment, servo controller 146 begins bottom casting die 42 is dropped to so-called CAM speed, second predetermined speed or " Dwell (pause) 1 " speed (frame 275).In this process, same speed and position detection are carried out (frame 270) again, have decelerated to up to definite bottom casting die 42 to stop, and have been in " DWELL (pause) 1 " (C) position.

At this moment a pause timing register (not shown) is activated (frame 285).Servo controller 146 will continue the position detection at bottom casting die 42, and PLC 135 detects the remaining time in the pause timing register.This program is carried out the operator is programmed for whole time cycle of " DWELL1 " time by operator interface 138 in always.This operation is with frame 290 expressions, in the back with more detailed description.

The time one of pause timer arrives, and casting die 142 will move by (frame 295) to " DWELL2 " position or " E " position with predetermined " DWELL2 " speed, check speed and position (frame 270) of bottom platen simultaneously.When this part finished in circulation, bottom platen 42 had decelerated at the backstop of " DWELL 2 " position (frame 300).

The timer (not shown) is activated (frame 305) " to pause 2 ", the last time of the position of leave from office plate and timer is constantly detected (frame 290) again, up to " pause 2 " timer then, at this moment lower platen with downward speed or speed to " waits " position move (frame 305).(frame 270) constantly detected again in its speed and position, up to reaching " holding fix " (frame 310).At this moment one signal is provided, shown in frame 255, indicates the circulation of bending to finish, another has performed to start and has prepared.

The method of " check position " operation (frame 290) is shown in Fig. 8.During pause, wish that bottom casting die 42 is retained in tram and not " wriggling ", because this affects the quality of manufactured glassy product.For this reason, when " pausing 1 " or " pausing 2 " system's continuation circulation when timer suspends.Will by the inquiry: " correct position? " (frame 290B) detection position (frame 290A).

If correct position (frame 290B) then detect timer (frame 290C).If timer is not then then program will continue circulation through (frame 290A), (290B and 290C), up to timer then, program just enters next step.If do not find correct position at any time, then program detects timer (frame 290D) again, as long as timer not then, is just adjusted position (290E), detection position (frame 290A) again then.Position if still incorrect (frame 290B), timer is detected (frame 290D) once more, if the time also has residue then adjusts position (frame 290E) again.As long as timer is not then, the also incorrect circulation that then continues by frame 290A, 290B, 290D and 290E in position.In case correct position, program will be enabled previously described circulation (290A, 290B and 290C).Should illustrate that timer is active, both make then at the pause timer also not reach accurately the predetermined ideal location procedure and also will proceed.

When press-bending program (frame 260) when finishing, send a replacement servo-valve (frame 320) and second conveying roller of resetting to signal fast, so that be in preparation receives next piece sheet glass S from first group of conveyor rollers 24 state (frame 325).

Should be understood that the present invention the form of this diagram and description just as preference pattern of the present invention with an illustrative embodiment, the various variations of shape, size and component configuration and the variation of various programs are only otherwise deviate from spirit of the present invention and all can adopt.

Claims (41)

1. One kind the operation one plate glass press method, this plate glass press comprises being mounted to makees the first and second relative casting dies close mutually and isolating reciprocal relative movement, two casting dies have relative complementary drip molding, to be used for the required bending of a warmed-up sheet glass generation of pressurized therebetween; Also comprise and be used for directly pushing the sheet glass that is bent to described first and second casting dies, between the two, push and push the e Foerderanlage and that sheet glass leaves the two and be fixed in first casting die, be used for optionally with described first casting die to second casting die transport or with it from the actuator that second casting die is recalled, described method comprises the steps:

   A) directly sheet glass is pushed to a position between described first and second casting dies along described roller conveyor device,

   B) control this actuator and send and recall first casting die to along a path according to a preset program, advance to a position of contact for the first time from the position below the end face of a described roller conveyor device at first casting die described in the described preset program, and described sheet glass risen to described second casting die from described roller conveyor device contact, so that according to described preset program to its bending

   C) monitor position and the speed of first casting die continuously, and produce the physical location of indication first casting die and first signal of speed along this passage,

   D) physical location that detects and speed are compared with a predetermined desired location and speed and produce indication physical location and speed and the second signal that should be scheduled to the deviation of desired location and speed,

   E) respond the Signal Regulation actuator that this indicates this deviation, make described first casting die advance or step back and come crooked described sheet glass along this path according to preset program.
2. 2. the method for a kind of operation one plate glass press as claimed in claim 1, it is characterized in that, wherein actuator comprises a hydro-cylinder, provide the band hydraulic fluid by a servo-valve to it, this method comprises according to the second signal of the deviation of preset program and response indication physical location and speed and the desired location that should be scheduled to and speed locatees servo-valve, so that the accommodation zone hydraulic fluid is to the supply of hydro-cylinder, thereby send and return first casting die to according to preset program.
3. 3. the method for a kind of operation one plate glass press as claimed in claim 2, it is characterized in that, comprise a Linear displacement transducer that links to each other with described first casting die, described Linear displacement transducer responds advancing of described first casting die and returns and produces described first signal.
4. 4. the method for a kind of operation one plate glass press as claimed in claim 3, wherein bulldozer comprises a programmable movements controller, import this preset program within it, this method comprises described first signal is sent to the programmable movements controller from Linear displacement transducer, produces described second signal by the programmable movements controller.
5. 5. the method for a kind of operation one plate glass press as claimed in claim 4, wherein a position module and servo-valve are operatively connected, this method comprises from described programmable movements controller and transmits described second signal to described position module that described position module responds described second signal and regulates servo-valve.
6. 6. the method for a kind of operation one glass bulldozer as claimed in claim 3, comprise that starting first casting die moves to second casting die with one first speed, produce indication first casting die at the Linear displacement transducer place and arrived the first location signal in a predetermined position on the passage, and make first casting die with one to the first slow-footed second speed progressive step in response to first location Signal Regulation servo-valve.
7. 7. the method for a kind of operation one plate glass press as claimed in claim 6, be included in the Linear displacement transducer place and produce a second position signal of indicating first casting die to arrive the predetermined stall position of close second casting die, and respond second position Signal Regulation servo-valve stops first casting die on the predetermined stall position near second casting die step.
8. 8. the method for a kind of operation one plate glass press as claimed in claim 7, comprise that scheduled time of being detained at the stall position place along with first casting die then, regulating servo-valve makes first casting die return from second casting die along passage, produce an indication first casting die from Linear displacement transducer and arrived a predetermined three position singal of returning rest position, and respond this three position singal and regulate servo-valve and make first casting die stop at this to return rest position.
9. 9. the equipment of warmed-up sheet glass is used to bend, comprise the first and second relative casting dies, be used to install first and second casting dies and make its device along passage relative movement reciprocal close to each other with leaving, be applicable to that on first and second casting dies warmed-up sheet glass to pressurized between the two produces the relative complementary drip molding of required bending, being connected in first casting die can operate and optionally make first casting die advance and leave the actuator devices that it is return towards second casting die along this passage, be operably connected to actuator devices and be used to regulate the motion control device that this actuator makes first casting die advance and return by a preset program, one can operate to produce the Linear displacement transducer of indication first casting die along the signal of the position of path and speed, with the device that transmits signal to motion control device, thereby motion control device comprises the device that makes first casting die advance and return according to preset program in response to the Signal Regulation actuator.
10. 10. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 9, wherein actuator comprises a hydro-cylinder, this equipment comprises that one is used for a pump and the servo-valve to this cylinder supply band hydraulic fluid, reaches by this this cylinder of servo-valve direction of flow and flows out from this cylinder.
11. 11. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 10, wherein motion control device comprises a programmable movements controller, and a program input that is used for operating described first casting die according to a predetermined circular order wherein; An and position module that is operably connected to described servo-valve, described position module is applicable to response from the described servo-valve of the signal framing of described programmable movements controller and described servo-valve, thereby described first casting die moves according to described predetermined circulation step.
12. 12. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 11, comprise a skeleton and the device that described first casting die makes its straight reciprocating motion in described skeleton is installed, described Linear displacement transducer comprises that a static part and that is stated from described skeleton is stated from the moving part of the cooperation of described first casting die.
13. 13. the equipment that is used for crooked warmed-up sheet glass as claimed in claim 11 comprises the operator interface devices that is used for routine data is imported described programmable movements controller that is operatively connected in the programmable movements controller.
14. 14. be used for warmed-up sheet glass is bent into the equipment of a predetermined shape, comprise a skeleton; One is installed in the described skeleton and has the reciprocating casting die of first drip molding of the bending consistent with the shape of the sheet glass that will produce; One be installed in the described skeleton relative with first drip molding and have second drip molding with the first drip molding complementary shape; Be used for the heated glass plate is transported to device in the press-bending position between first and second drip moldings from a contiguous stove; One is used to make the reciprocating hydraulic actuator of described reciprocating casting die; Operationally be connected in the motion control device of this hydraulic actuator design, described motion control device is applicable to that the operation actuating device makes reciprocating casting die circulate according to a preset program; One Linear displacement transducer that links to each other with reciprocating casting die, but be used to produce the physical location of indication to-and-fro movement casting die and the signal of speed; And the device that is used for transmitting to motion control device signal from Linear displacement transducer.
15. 15. the equipment that is used for crooked warmed-up sheet glass as claimed in claim 14, wherein said motion control device comprise a programmable movements controller, this equipment comprises operator interface devices, is used for to described motion controller input data.
16. 16. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 14, wherein said Linear displacement transducer comprise the moving part of a cooperation of being supported by described reciprocal casting die by a static cell of described skeleton supporting and.
17. 17. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 15, wherein said hydraulic actuator design comprises that one supports and comprise the hydro-cylinder of a piston rod that can axially stretch out and return by described skeleton, and this piston rod connects with described reciprocating casting die.
18. 18. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 17, comprise that one supplies with the pump and a servo-valve of hydraulic fluid to described cylinder, hydraulic fluid flows to described cylinder by this servo-valve and flows out from described cylinder optionally controls stretching out and returning of described piston rod.
19. 19. the equipment of the warmed-up sheet glass that is used to bend as claimed in claim 18, comprise one with described servo-valve operation on the position module that is connected, be used for optionally regulating described servo-valve; And transmit signal to described position module from described programmable movements controller, so that in response to the device of regulating described servo-valve from the signal of described motion controller.
20. 20. the method for operation one plate glass press, this plate glass press is such one type, and it has and is mounted to the first and second relative casting dies that can do towards each other with isolating reciprocal relative movement; Be used for directly promoting isolating and unique bend glass sheets for the treatment of to described relative first and second casting dies, between it and leave the roller conveyor device of its motion, an and actuator that is fixed in first casting die, be used for selectively described first casting die being reached towards leaving described second casting die with it is drawn back according to a preset program, first and second casting dies have relative complementary drip molding, be used for to one betwixt the warmed-up sheet glass of pressurized produce required bending, described method comprises the steps:

    A) carrying a sheet glass to the position between described first casting die and described second casting die on the described transfer roller,

    B) send and return described first casting die according to described preset program control actuator to along a path,

    C) pass through

    I) physical location that detects and speed and a predetermined desired location and speed are made comparisons and produce the speed command signal of difference of required speed, position and the direction of physical location, speed and the direction of an indication first casting die and described first casting die,

    Ii) produce the difference that a servo-control signal responds physical location, speed and direction and desired location, speed and direction and control described servo actuator with described speed command signal,

    Iii) produce a servocontrol feedback signal,

    Iv) described servo-control signal and described servocontrol feedback signal are made successive relatively, and regulate described servo actuator to guarantee described first casting die and advance and to return according to described preset program in response to described comparative figure, monitor first casting die continuously according to position and the speed of described preset program along a path.
21. 21. the method for operation one plate glass press, this plate glass press is such one type, and it has and is mounted to the first and second relative casting dies that can do towards each other with isolating reciprocal relative movement; Be used to promote a sheet glass to be curved to the described first and second relative casting dies, between it and from it, leave the variable-ratio conveyor device of motion; Detect the sensing device that a sheet glass exists on described variable-ratio conveyor device; Change the control device of described conveyor speed; The sensing device of the described conveyor speed of sensing; And one be fixed in first casting die and be used for optionally carrying described first casting die and it being left the actuator that second casting die is return to described second casting die, first and second casting dies have relative complementary drip molding, be used for the required bending of sheet glass generation of pressurized betwixt, described method comprises the steps:

    A) operate described conveyor device with one first predetermined ideal velocity

    B) on described conveyor device, carry a sheet glass with the described first predetermined ideal velocity to described first casting die,

    C) when arriving a transverse feed position, described sheet glass carries out sensing by described sensing device,

    D) when described conveyor device with described glass sheets to described first and described second casting die between a position time utilize described control device that it is decelerated to one second predetermined ideal velocity,

    E) arrive described second predetermined speed with described conveyor device and interrelate the control actuator along sending and return described first casting die to according to a described pre-programmed path, wherein said first casting die advances to first contact position plate from the position below the end face of described conveyor device, sheet glass is risen to described second casting die from described e Foerderanlage to contact so that bend then.
22. 22. method as claimed in claim 21 also comprises the steps:

    A) monitor position and speed and the physical location of generation indication described first casting die and first signal of speed of first casting die continuously along this path,

    B) physical location that detects and speed and a preposition and speed are made comparisons, and produce the second signal of the deviation of indication physical location and speed and predetermined position and speed,

    C), make described first casting die advance and return and come crooked described sheet glass along this path according to preset program in response to Signal Regulation actuator of this difference of indication.
23. 23. method as claimed in claim 22, wherein the step of carrying out sensing by described sensing device when described sheet glass arrives a transverse feed position comprises with a photocell eye detect the step that a sheet glass exists on described variable-ratio conveyor device.
24. 24. the method for operation one plate glass press, this plate glass press is such one type, and it has and is mounted to the first and second relative casting dies that can do towards each other with isolating reciprocal relative movement; Be used to promote one and treat that bend glass sheets is to described first and second casting dies, between it and leave the variable-ratio conveyor device of its motion; Detect the sensing device that a sheet glass exists on described variable conveyor device; Can improve on request or reduce and come the sheet glass progressive stop device of backstop on described variable-ratio conveyor device; Change the control device of described conveyor device speed; The counting mechanism and one that detects described conveyor speed is fixed in first casting die and comes optionally described second casting die is sent into and left to described first casting die and the actuator return towards described second casting die, first and second casting dies have relative complementary drip molding, be used for a warmed-up sheet glass of being pressed is betwixt produced required bending, described method comprises the steps:

    A) with the one first predetermined described conveyor device of speed operation that requires;

    B) on described variable-ratio conveyor device, carry a sheet glass with the described first predetermined speed that requires to described casting die;

    C) determine that with described sensing device a sheet glass has arrived a transverse feed position;

    D) mention described stop device;

    E) start described counting mechanism;

    F) whether the count value of determining described counting mechanism equals one first operator's prevalue, if the count value of described counting mechanism equals described first operator's prevalue, when described conveyor device with described glass sheets to described first and described second casting die between a position time, utilize described control device that it is decelerated to one second predetermined ideal velocity;

    G) continuous pulse count, and umber of pulse and an operator second prevalue made comparisons; And

    H) determine that the umber of pulse of counting equals second operator's prevalue, and fall described stop device, start described actuator simultaneously and come along sending into and return first casting die according to a pre-programmed path.
25. 25. method as claimed in claim 23 also is included in and again described variable velocity conveyor device is reset to first predetermined speed after described preset program is finished and the described actuator that resets again.
26. 26. method as claimed in claim 24, the pre-programmed step of wherein said operation comprises the steps:

    A) determine that described system is activated,

    B) described bottom casting die is moved to one " wait " position,

    C) check " wait " position that described bottom casting die is in correct predetermined requirement continuously.
27. 27. method as claimed in claim 25 further comprises the steps,

    A) receive a signal from described counting mechanism and start described preset program,

    B) described bottom casting die is moved to one first predetermined position from described " wait " position, check the speed and the position of described bottom casting die simultaneously continuously;

    C) described bottom casting die is moved to one second predetermined position from described first predetermined position, check the speed and the position of bottom casting die simultaneously continuously;

    D) start a dead time timer, and then described bottom casting die is remained on described second predetermined position at described dead time timer;

    E) described bottom casting die is moved to one the 3rd predetermined ideal position, check the speed and the position of described bottom casting die simultaneously continuously;

    F) start a dead time timer and check the position of bottom casting die continuously and described timer in the remaining time, up to described dead time timer then;

    G) described bottom casting die is dropped to described " wait " position, check the speed and the position of bottom casting die simultaneously continuously.
28. 28. method as claimed in claim 26 wherein detects continuously and proofreaies and correct the speed of first casting die and the step of position comprises the steps:

    A) speed that detects described casting die is to determine whether described speed equals the predetermined speed that requires;

    B) if necessary proofread and correct described speed;

    C) whether the physical location of checking described bottom casting die is positioned at a predetermined position that requires.
29. 29. be used for the bend equipment of a predetermined shape of warmed-up sheet glass is comprised a skeleton; One be installed in the described skeleton and with crooked corresponding to first drip molding of the shape of the sheet glass that will produce; One be installed in the described skeleton relative with first drip molding and have one and second drip molding of the described first drip molding complementary shape; At least a portion has the conveyor device that is used for a warmed-up sheet glass is sent into from an adjacent stove press-bending position between first and second drip moldings of variable-ratio characteristic; Be used for the sensing device that a definite sheet glass exists on described conveyor device; Be used to control the control device of speed of the described part of variable-ratio at least of described conveyor device; One is used to make the reciprocating hydraulic actuator of described reciprocating casting die; Be operably connected to the motion control device of hydraulic actuator design, come according to preset program circulation to-and-fro movement casting die but described motion control device is suitable for the operate actuator device; One Linear displacement transducer that links to each other with a reciprocating casting die is used to produce the physical location of the reciprocating casting die of indication and the signal of speed; And the device that is used for these signals are sent to from Linear displacement transducer motion control device.
30. 30. equipment as claimed in claim 29, wherein said motion control device comprises a programmable logic controller, and this equipment comprises the operator interface devices that is used for to described programmable logic controller input data.
31. 31. equipment as claimed in claim 30, wherein said Linear displacement transducer comprise one by the static cell of described skeleton carrying and a moving part by the cooperation of described reciprocating casting die carrying.
32. 32. equipment as claimed in claim 31, wherein said hydraulic actuator design comprise a hydro-cylinder by described skeleton carrying, and comprise that one is connected in the piston rod that can axially stretch out and return of described reciprocating casting die.
33. 33. equipment as claimed in claim 32, comprising a pump to described cylinder supply band hydraulic fluid, a servo-valve flows to and flows out described cylinder by this servo-valve hydraulic fluid, thereby optionally controls stretching out and returning of described piston rod.
34. 34. equipment as claimed in claim 33, comprise that one is connected in the servo controller of described servo-valve, be used for optionally regulating described servo-valve, also comprise a servo controller that is connected in described servo-valve and described programmable logic controller, be used to respond and adjust described servo-valve from the signal of described programmable logic controller.
35. 35. equipment as claimed in claim 33, wherein said sensing device comprise that one is connected in the photocell eye of described programmable logic controller.
36. 36. equipment as claimed in claim 34, the control device of the speed of described at least a portion of the described conveyor device of wherein said control comprises:

    A) one be mounted to the surge generator that rotates the velocity of rotation that produces the described conveyor rollers of an indication to described conveyor device,

    B) comprise that being mounted to operation counts a Magnetic Sensor of described pulse near described pulse generating unit;

    C) motor speed controller that is connected in described Magnetic Sensor and described programmable logic controller;

    D) motor driver that is connected in described motor speed controller;

    E) one drive the motor that is connected in described conveyor device and is electrically connected on described motor driver.
37. 37. equipment as claimed in claim 36 further comprises a regracting stop device that is connected in described programmable logic controller, it can be operated and stop that a sheet glass passes through along described e Foerderanlage.
38. 38. equipment as claimed in claim 37, the wherein said device that is used to count the magnetic-pulse that is produced by described Magnetic Sensor comprises the device that described umber of pulse and predetermined required value are compared, with the device of indicating when described predetermined required value reaches, described programmable logic controller is in response to described actuator of described signal control and described conveyor device from described counter device.
39. 39. equipment as claimed in claim 38, wherein said motor speed controller can predetermined require deceleration automatically between the speed with one second in the one first predetermined speed that requires when a signal of receiving from described programmable logic controller.
40. 40. equipment as claimed in claim 39, wherein said pulse generating unit comprise that one is installed on the gear of the axle of described motor.
41. 41. equipment as claimed in claim 40, wherein said conveyor device comprise be used to carry sheet glass pass a heating chamber in the stove first group of conveyor rollers, be used to enter second group of conveyor rollers of bending station and motion within it and be used for sheet glass is taken out of another group conveying roller of described bending station, described second group of roller can change its speed by described control device.

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