CN101920572A - Electric screw press and limit method thereof - Google Patents
Electric screw press and limit method thereof Download PDFInfo
- Publication number
- CN101920572A CN101920572A CN 200910303163 CN200910303163A CN101920572A CN 101920572 A CN101920572 A CN 101920572A CN 200910303163 CN200910303163 CN 200910303163 CN 200910303163 A CN200910303163 A CN 200910303163A CN 101920572 A CN101920572 A CN 101920572A
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- motor
- frame
- switched reluctance
- screw press
- electric screw
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Abstract
The invention discloses an electric screw press and a limit method thereof. A motor of the electric screw press is connected with a flywheel through a transmission device; the flywheel is connected with a screw; the screw is connected with a sliding block by adopting screw threads; the screw and the sliding block extend into a frame and move up and down in the frame; the motor is a switched reluctance motor, and a position sensor is arranged on the switched reluctance motor and connected to a limit control functional module; and the frame is provided with a sliding block motion datum point. The limit method comprises the following steps of: counting position signals of the position sensor of the switched reluctance motor, calculating the current position of the sliding block according to the position counting value, comparing the current position with a required limit position to provide basis for the motion of the electric screw press, and setting a position counter when the sliding block reaches the datum point. The limit method realizes automatic adjustment of the limit position and enhances the reliability of a machine tool system by using the position signals of the switched reluctance motor to determine the limit position.
Description
Technical field
The present invention relates to a kind of electric screw press and limit method thereof.
Background technology
Electric screw press is a kind of novel advanced person's a forcing press, and it utilizes the reversible motor constantly to do the commutation campaign of both forward and reverse directions, drives the rotation of flywheel and screw rod, and slide block is moved up and down.Be different from common friction type press, electric screw press has that precision height, striking capabilities can be adjusted, reliability height, advantage that maintenance cost is low.
Fig. 1 is the mechanical schematic diagram of electric screw press.Motor 1 is by belt or gear connection flywheel 2, and flywheel links to each other with screw rod 4, and screw rod and slide block 5 adopt and be threaded, and when screw rod rotated with a direction, slide block descended, and promptly hit, and when screw rod rotated with another direction, slide block rose, i.e. return.The frame of ram travel is provided with upper limit position switch 8 and lower limit position switch 9.When slide block down hit, when reaching lower limit, motor discharged, and no longer exerts oneself, and the slide block freedom is descending, hit the bounce-back of workpiece rear slider, and after detecting bounce-back, the motor counter-rotating starts, and slide block rises.When arriving upper limit, motor begins braking deceleration, and stops at certain point above the upper limit.The determining positions of stopping is in upper limit bit position and the rate of climb and deceleration slope.The position of stopping is that motor hits stroke to the distance of lower limit, and the maximal rate that the direct influence of the size of the trip can reach is maximum blow energy.
At present known spacing technology is to adopt to be placed on upper limit position switch and lower position switch place on the frame near switch or Hall sense switch, places on slide block near switch with iron block or permanent magnet.When needs are adjusted upper limit and lower limit, adjust near switch or Hall sense switch.
The present major defect of scheme, the one, upper limit has only determined the position that begins to brake, and can not determine stop position, its stop position of the different rates of climb is different.Cross when low when stop position, the blow speed that can have the greatest impact and energy if used material jacking mechanism, also can influence the function of liftout.Can lower efficiency when too high, even can make slide block run into frame top or screw thread is locked.And the rate of climb can not immobilize, and the user has the needs of adjusting the rate of climb on the one hand, and the bounce-back of blow speed can influence the rate of climb on the other hand, will cause stop position to change like this.In order to satisfy stop position in tolerance band, when the user adjusts the rate of climb or blow speed, need to adjust upper limit bit position, reduced efficient like this, also operating personnel have been increased difficulty.Adopt near switch on the other hand or all there is the low problem of reliability in Hall switch, detecting element all is exposed to the abominable working link of forcing press, vibration and high temperature all can make detecting element aging, metallic dust and greasy dirt can be attached to the detecting element surfaces, make the detecting element misoperation or are failure to actuate.And the inefficacy of detecting element will lead to grave consequences.
Summary of the invention
The technical issues that need to address of the present invention just are to overcome the defective that existing electric screw press adopts the uncertain and component failure of the slide block stop position that brings as limit switch near switch or Hall switch, a kind of electric screw press and limit method thereof are provided, it utilizes the position signalling of switched reluctance machines to determine spacing position, the upper limit of slide block is adjusted under the situation that need not artificially participate in automatically, make the slide block stop position in relatively more fixing scope, also cancelled near limit switches such as switch or Hall switch simultaneously, adopt the higher motor position switch of reliability, strengthened the reliability of machine tool system.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of electric screw press of the present invention, comprise motor, flywheel, frame and spacing control functional module, described motor is connected with described flywheel by transmission device, described flywheel connects a screw rod, described screw rod bottom is by the slide block that is threaded, described screw rod and slide block stretch in the inherent frame of frame and move up and down, described motor is a switched reluctance motor, a position sensor is installed on the described switched reluctance motor, described position sensor is connected to spacing control functional module, described spacing control functional module has counting, calculating location, comparison and set function, described frame are provided with a slide block movement datum mark.
The present invention discloses the limit method of described electric screw press, described method is for to count the position sensor signal of switched reluctance machines, calculate the current slide position according to the position counting value, relatively current location and the spacing position that needs provide foundation for electric screw press moves.
A position switch is set as datum mark in the ram travel in frame, when slide block arrives datum mark, upgrades location counter.
The present invention utilizes the position signalling of switched reluctance machines position sensor to determine spacing position, and having realized can self-adjusting spacing position, has also strengthened the reliability of machine tool system.
Usage counter Q of the present invention counts the position signalling of switched reluctance machines position sensor, and slide position S sum counter count value is linear, i.e. S=K * (Q-Q
j)+S
jK is that the pitch of conversion coefficient and motor position signal revolution umber of pulse and screw rod has relation.The motor position signal number of different progression is different, is 48 of revolutions such as the pulse number of 12/8 three phase electric machine.S
jBe the position of datum mark, Q
jIt is the Counter Value of datum mark.Can select S
jBe 0, this datum mark is the zero point of slide position, and when arriving this datum mark, count initialized device Q is Q
j, other positional value S=K * (Q-Q then
j).Also can select Q
jBe 0, this datum mark is counter zero point, and when arriving this datum mark, initialized location value S is S
j, other positional value S=K * Q+S then
j
With current location S with upper limit S
1With lower limit S
2Positional value compare, just can obtain the mode of motor action:
During descending strike, when current location S is lower than lower limit S
2The time, motor discharges, art skating.During up return, when current location S is higher than upper limit S
1The time, motor begins Brake stop, and stops at S
3The position.If speed droop is a, the rate of climb is V, and braking time is t, then S
3-S
1=V * t ÷ 2, so V=a * t is S
3=S
1+ V
2÷ (2 * a).In order to guarantee S
3Relative fixed then under the different rates of climb, is selected corresponding S
1, promptly lower upper limit when the rate of climb is fast, is selected in upper limit site, when the rate of climb is hanged down, selects higher upper limit, and the concrete operation formula is
S
1＝S
3-V
2÷(2×a)
Choosing of position reference point can increase by one near switch in slide block hits stroke, with this position of the switch as datum mark.
Exist elasticity to connect or slipping device when whole machine driving connects, the Counter Value or and the positional value of datum mark then must be set when arriving datum mark at every turn.If it is to be rigidly connected and not have to skid that machine driving connects, then Counter Value or and positional value can only be set when reach datum mark the first time that powers on.
The beneficial effect of technical scheme provided by the invention is:
Switched reluctance motor is the motor that is particularly suitable for electric screw press, has advantages such as overload capacity is strong, overload current is little, response is fast, rotor structure simple rigid, is widely used in electric screw press.Position sensor has been installed on switched reluctance machines, and as the position signalling of control motor operation, motor whenever turns around and can produce n pulse signal, and n is relevant with rotor progression.Position switch is placed in the space of motor sealing, and degree of protection is very high, adopts contactless detection method, the reliability height.
Description of drawings
Fig. 1 is the mechanical schematic diagram of electric screw press of the prior art.
Fig. 2 is the mechanical schematic diagram of electric screw press of the present invention.
Fig. 3 is a control principle block diagram of the present invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
As shown in Figure 2, a kind of electric screw press of the present invention, comprise motor 1, flywheel 2 and frame 3, described motor is connected with described flywheel by transmission device, described flywheel connects a screw rod 4, described screw rod bottom is by the slide block 5 that is threaded, described screw rod and slide block stretch in the inherent frame of frame and move up and down, described motor is a switched reluctance motor, a position sensor 6 is installed on the described switched reluctance motor, described position sensor is connected to spacing control functional module, described spacing control functional module control principle block diagram as shown in Figure 3, described spacing control functional module has counting, calculating location, comparison and set function, described frame are provided with a slide block movement datum mark 7.
Control principle of the present invention as shown in Figure 3, position sensor is the position sensor that the reluctance motor of Fig. 2 carries, electric machine controller is the speed-regulating control device of switched reluctance machines, has included the spacing control functional module of forcing press simultaneously, and PLC is a forcing press control Programmable Logic Controller.Electric machine controller reads the position signalling of position switch feedback, and counting, obtains count value Q.The closure signal of PLC judgment standard point, selection reference point are position zero point, i.e. S
jBe 0.When the PLC As-received sends to electric machine controller after the closure simultaneously on schedule the datum mark signal is set, controller is provided with Q after receiving the datum mark signal being set
jBe current Counter Value.Controller carries out position calculation, current location S=K * (Q-Q
j).PLC issues electric machine controller with the positional value of upper limit S1 and lower limit S2 by 485 communications, electric machine controller compares with spacing value S1 and S2 current position signal S, then export and be higher than the upper limit signal and give PLC when being higher than upper limit S1, then export and be lower than the lower limit signal and give PLC when being lower than lower limit S2.The PLC judgement is higher than upper limit and is lower than the lower limit signal, sends descending strike startup, up lifting startup, blow speed and speed uplink by 485 communications to electric machine controller.As realizing up stop position S3 relative fixed, then PLC is according to the rate of climb and rate of deceleration calculating upper limit position S1, and sends to electric machine controller by 485 communications.
Owing to have buffer unit between motor and flywheel in this specific implementation method, can have skidding, so the each As-received of PLC on schedule closure signal all can send the datum mark signal is set to electric machine controller, comprise slide block down strike and up lifting.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. electric screw press, comprise motor, flywheel, frame and spacing control functional module, described motor is connected with described flywheel by transmission device, described flywheel connects a screw rod, described screw rod bottom is by the slide block that is threaded, described screw rod and slide block stretch in the inherent frame of frame and move up and down, it is characterized in that: described motor is a switched reluctance motor, a position sensor is installed on the described switched reluctance motor, described position sensor is connected to spacing control functional module, described spacing control functional module has counting, calculating location, comparison and set function, described frame are provided with a slide block movement datum mark.
2. the limit method of an electric screw press as claimed in claim 1, it is characterized in that: described method is for to count the position sensor signal of switched reluctance machines, calculate the current slide position according to the position counting value, relatively current location and the spacing position that needs provide foundation for electric screw press moves.
3. the limit method of electric screw press as claimed in claim 2 is characterized in that: a position switch is set as datum mark in the ram travel in frame, when slide block arrives datum mark, upgrades location counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910303163 CN101920572A (en) | 2009-06-11 | 2009-06-11 | Electric screw press and limit method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910303163 CN101920572A (en) | 2009-06-11 | 2009-06-11 | Electric screw press and limit method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101920572A true CN101920572A (en) | 2010-12-22 |
Family
ID=43335901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910303163 Pending CN101920572A (en) | 2009-06-11 | 2009-06-11 | Electric screw press and limit method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101920572A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102990958A (en) * | 2012-11-12 | 2013-03-27 | 浙江丰诚精锻科技有限公司 | Digital-control electric screw press |
| CN107175307A (en) * | 2016-03-10 | 2017-09-19 | 上海工程技术大学 | The real-time displacement measure and control device of fly press |
-
2009
- 2009-06-11 CN CN 200910303163 patent/CN101920572A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102990958A (en) * | 2012-11-12 | 2013-03-27 | 浙江丰诚精锻科技有限公司 | Digital-control electric screw press |
| CN107175307A (en) * | 2016-03-10 | 2017-09-19 | 上海工程技术大学 | The real-time displacement measure and control device of fly press |
| CN107175307B (en) * | 2016-03-10 | 2020-09-08 | 上海工程技术大学 | Real-time displacement measuring and controlling device of screw press |
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Application publication date: 20101222 |