CN102366999B - High precision automatic control device for weight per unit length of material discharged from extruder - Google Patents
High precision automatic control device for weight per unit length of material discharged from extruder Download PDFInfo
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- CN102366999B CN102366999B CN2011103358560A CN201110335856A CN102366999B CN 102366999 B CN102366999 B CN 102366999B CN 2011103358560 A CN2011103358560 A CN 2011103358560A CN 201110335856 A CN201110335856 A CN 201110335856A CN 102366999 B CN102366999 B CN 102366999B
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- counterweight
- extruder
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- moving counterweight
- lever
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/72—Measuring, controlling or regulating
- B29B7/728—Measuring data of the driving system, e.g. torque, speed, power, vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92142—Length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/9218—Weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92438—Conveying, transporting or storage of articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92638—Length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92676—Weight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
Abstract
The invention relates to a high precision automatic control device for the weight per unit length of a material discharged from an extruder. The device is characterized in that: the input terminus of a controller is connected with a weighing apparatus, and the output terminal of the controller is connected with a driving motor of an extruding screw of the extruder or a driving motor of traction rolls; the weighing apparatus comprises a raw material hopper, a frame and a weighing hopper, the raw material hopper is arranged on the upper end of the frame, and the lower outlet of the raw material hopper is provided with a gate; the weighing hopper is arranged under the raw material hopper, one side of the weighing hopper is connected with one end of a lever, the other end of the lever is provided with a fixed counterweight, the fulcrum of the lever is hinged to the frame, a lower proximity switch is arranged under the fixed counterweight; a movable counterweight is arranged above the fixed counterweight, the movable counterweight is movably supported on a counterweight support, and an upper proximity switch is arranged under the movable counterweight; and the gate, the upper proximity switch and the lower proximity switch are respectively connected with the controller. The device of the invention has the advantages of structure simplification, cost reduction, simple control principle and control precision improvement.
Description
Technical field
The present invention relates to a kind of high precision in control device of discharge weight per unit length of extruder, be mainly used on inflation film manufacturing machine, drawbench, electric wire machine, plastic winding machine and spray silk (bar) machine the length of discharging, the uniformity of thickness being controlled.
Background technology
The basic skills of a kind of uniformity of the discharging to extruder control is in the prior art, adopt balance-type type meausring apparatus meter to calculate charging rate (being the material quantity that enters in the unit interval in the extruder), then according to the extruding screw of charging rate control extruder or the rotating speed of carry-over pinch rolls, the rotating speed of charging rate and described extruding screw is inversely proportional to, or be directly proportional with the rotating speed of carry-over pinch rolls, keep film thickness even.The meausring apparatus of this balance-type type comprises that mainly former hopper, frame, scale hooper and charging be connected (being connected with the charging aperture of extruder), and the top and bottom that are installed in respectively frame are taken in former hopper and charging, in the outlet of the lower end of this former hopper gate is housed; Described scale hooper is installed between former hopper and the charging adapter, one side of this scale hooper is connected with an end of a lever, the other end of this lever is equipped with a fixed weight, and the fulcrum of this lever is hinged on this frame, is provided with up and down position-limit mechanism and feed supplement approach switch at this lever; In the outlet of the lower end of scale hooper the material level approach switch is housed.In the time interval that this meausring apparatus utilizes the material level approach switch to send twice adjacent feed signal, use the weight of charging one scale hooper divided by this time interval, and then calculate discharge weight per unit length of extruder.But because the measure error of material level is larger, the inlet amount precision in the unit interval that therefore calculates is lower.In order to address the above problem, adopt in addition two cover balance units to carry out weighing, although improve to a certain extent control accuracy, the structural complexity that has increased has improved cost and fault rate.
In addition, at every turn in the scale hooper during blowing, because closing gate needs a process, particulate material has at random resistance to gate, all can cause putting into the raw material of scale hooper and there is error in the weight of setting at every turn, if to carry out timing and calculating this moment, must cause controlling the result and larger error occur, affect control accuracy.
Summary of the invention
Purpose of the present invention just provides a kind of high precision in control device of discharge weight per unit length of extruder, the complex structure that exists to solve prior art, and cost is high, is difficult for maintenance and debugging, and control accuracy is poor, and cost improves and the high problem of fault rate.
Technical scheme of the present invention is: a kind of high precision in control device of discharge weight per unit length of extruder, comprise controller and meausring apparatus, the input of this controller is connected with meausring apparatus, the output of this controller is connected with the drive motors of the extruding screw of extruder or the drive motors of carry-over pinch rolls, described meausring apparatus comprises former hopper, frame, scale hooper and charging adapter, the top and bottom that are installed in respectively frame are taken in former hopper and charging, in the outlet of the lower end of this former hopper gate is housed, this gate is connected with a gate driving device; Described scale hooper is installed between former hopper and the charging adapter, one side of this scale hooper is connected with an end of a lever, the other end of this lever is equipped with a fixed weight, the fulcrum of this lever is hinged on this frame, be provided with up and down position-limit mechanism at this lever, lower approach switch is housed below this fixed weight, it is characterized in that: above described fixed weight, be provided with moving counterweight, this moving counterweight is supported on the counterweight support actively, is provided with approach switch below this moving counterweight; The controlled end of this gate driving device, upper approach switch and lower approach switch are connected with described controller respectively.
Described moving counterweight is comprised of main body and the undergauge slide bar that is located at this main body lower end, this undergauge slide bar is supported on the described counterweight support with longitudinal sliding, all be in when the next at this fixed weight and moving counterweight, leave the working clearance between the undergauge slide bar lower end of the top and moving counterweight of this fixed weight; The lower end central authorities of this undergauge slide bar are sphere or tip.
Be provided with longitudinal hole at described counterweight support, longitudinal hole is equipped with linear bearing in this, inserts the undergauge slide bar of described moving counterweight lower end in the centre bore of this linear bearing with being slidingly matched.
Described moving counterweight is discoid, and described undergauge slide bar is cylindrical, and coaxial with this moving counterweight.
Described moving counterweight is comprised of main body and swing arm, and an end and the described frame of this swing arm are hinged, and the other end is connected with this main body; Upper end in described fixed weight is provided with push rod, on the top of this push rod roller is housed; All be in when the next at this fixed weight and moving counterweight, leave the working clearance between the top of the roller on this push rod and moving counterweight following.
Main body or swing arm at described moving counterweight are provided with adjustable weight.
Described gate driving device adopts fluid cylinder, cylinder or electric device; Described controller adopts microcomputer or Programmable Logic Controller.
At described carry-over pinch rolls speed probe is housed, and is connected with described controller.
The output of described controller is connected with the drive motors of described carry-over pinch rolls by frequency converter, has saved speed probe.
Be provided with and surface-mounted support in the bottom of described frame; The charging aperture that lower end outlet and extruder are taken in described charging is oppositely arranged but leaves the gap, or the lower end outlet is taken in described charging is connected with the charging aperture of extruder by flexible pipe.
Advantage of the present invention is: it is time zero that the collection activity counterweight drops to the moment corresponding to a certain desired location together with fixed weight, raw material weight in the corresponding scale hooper is certain this moment, ignored the error that blowing initial time raw material weight exists, greatly improved control accuracy, and simplify the structure, manufacturing cost and fault rate have been reduced, easily maintenance and debugging.
Description of drawings
Fig. 1 is that (without raw material or only have a small amount of raw material, scale hooper is in upper the present invention's general structure of being applied in the first embodiment on the extruder in the scale hooper; Adopt speed probe to measure the rotating speed of carry-over pinch rolls) schematic diagram;
Fig. 2 is one of fundamental diagram of first embodiment of the invention (scale hooper just filled raw material after, be in the next);
Fig. 3 is two (the scale hooper position of beginning timing is the starting point moment this moment) of the fundamental diagram of first embodiment of the invention;
Fig. 4 is three (moving counterweight is fallen on the counterweight support, and the state that contacts with fixed weight) of the fundamental diagram of first embodiment of the invention;
Fig. 5 is general structure (identical with the state of Fig. 1, as the to save speed probe) schematic diagram that the present invention is applied in the second embodiment on the extruder;
Fig. 6 is general structure (swing arm moving counterweight) schematic diagram that the present invention is applied in the 3rd embodiment on the extruder;
Fig. 7 is general structure (meausring apparatus and the extruder isolating construction) schematic diagram that the present invention is applied in the 4th embodiment on the extruder.
The specific embodiment
Referring to Fig. 1-Fig. 4, the first embodiment of the high-precision control device of a kind of weight per unit discharge length of automatic control extruder of the present invention, this embodiment comprises controller 18 and meausring apparatus, the input of this controller 18 is connected with meausring apparatus, and the output of this controller 18 is connected with the drive motors 14 of the extruding screw of extruder 15 or the drive motors of carry-over pinch rolls 16.
The meausring apparatus of this embodiment comprises former hopper 1, frame 2, scale hooper 7 and charging adapter 8, former hopper 1 and charging adapter 8 are installed in respectively the top and bottom of frame 2, in the outlet of the lower end of this former hopper 1 gate 3 is housed, this gate 3 is connected with a gate driving device 4.Described scale hooper 7 is installed in former hopper 1 and charging is taken between 8, one side of this scale hooper 7 is connected with an end of a lever 11, the other end of this lever 11 is equipped with a fixed weight 12, the fulcrum of this lever 11 is hinged on this frame 2 by fulcrum 9, be provided with up and down position-limit mechanism 10 at this lever 11, the ceiling restriction fixed weight 12 of position-limit mechanism 10 is in jack-up moving counterweight 5 when upper up and down, but can not contact the lower end of counterweight support 6, as shown in Figure 2; The lower limit fixed weight 12 of position-limit mechanism 10 is in and does not contact lower approach switch 13 when the next up and down, leaves very little gap and gets final product, as shown in Figure 1.Lower approach switch 13 is housed below this fixed weight 12.
Be provided with moving counterweight 5 above described fixed weight 12, this moving counterweight 5 is comprised of main body 52 and the undergauge slide bar 51 that is connected to this main body lower end, and this undergauge slide bar 51 is supported on the described counterweight support 6 with longitudinal sliding.All be in when the next at this fixed weight 12 and moving counterweight 5, leave working clearance S(3～5mm) between undergauge slide bar 51 lower ends of the top and moving counterweight 5 of this fixed weight 12, the lower end central authorities of this undergauge slide bar 51 are sphere or tip, are provided with approach switch 19 below this moving counterweight 5.Described fixed weight 12 and moving counterweight 5 are oblate cylindricality (disk) shape, and described undergauge slide bar 51 is cylindrical, and coaxial with moving counterweight 5.
The setting of working clearance S, in order to be in the next at moving counterweight 5, and during 51 times end in contact of undergauge slide bar of the top of fixed weight 12 and moving counterweight 5, so that lower approach switch 13 is slightly larger than a distance of reaction with fixed weight 12, namely working clearance S is a bit larger tham the distance of reaction of lower approach switch 13.
The controlled end of described gate driving device 4, upper approach switch 19 and lower approach switch 13 are connected with described controller 18 respectively.Described controller 18 adopts microcomputer or Programmable Logic Controller.
Described gate driving device 4 adopts fluid cylinder, cylinder or electric device.
At described carry-over pinch rolls 16 speed probe 20(is housed and is commonly called as meter counter), speed probe 20 is connected with described controller 18.The rotating speed of the drive motors of carry-over pinch rolls 16 is controlled by frequency converter 22 by controller 18.
Rotating speed control to the drive motors of carry-over pinch rolls 16 also can not need speed probe 20(referring to the second embodiment shown in Figure 5).Export the rotating speed that the speed control frequency variation signals are controlled the drive motors of these carry-over pinch rolls 16 by described controller 18, go out the product length of exporting in the unit interval by this rotating speed and carry-over pinch rolls 16 circumference calculatings.Calculate and control extruder product length and uniformity thereof and compare with the mode of above-mentioned existing meter counter, have (having saved meter counter) simple in structure, measuring accuracy is high, saves the advantage of cost.
Linear bearing 61 is housed in the longitudinal hole of described counterweight support 6, and this linear bearing 61 slides and inserts the undergauge slide bar 51 of described moving counterweight 5 lower ends, reduces the frictional resistance that undergauge slide bar 51 moves up and down, and improves control accuracy.
This embodiment takes over the outlet of 8 lower ends with its charging and directly is connected with the charging aperture 151 of extruder 15 by flange 21 when using.
Referring to Fig. 6, the third embodiment of the present invention is different from the moving counterweight 5 among the first or second embodiment, and remainder is identical, and this identical part repeats no more.
The moving counterweight 5 of this embodiment, described moving counterweight 5 is comprised of main body 25 and swing arm 26, and an end of this swing arm 26 is connected with this main body 5, and the other end is hinged by bearing 30 and described frame 1.Be provided with push rod 28 in the upper end of described fixed weight 12, roller (bearing) 29 is housed on the top of this push rod 28.All be in when the next at this fixed weight 12 and moving counterweight 5, leave working clearance S between the top of the roller 29 on this push rod and moving counterweight 5 following.
Also can be in swing arm 26(or the main body 25 of described moving counterweight 5) be provided with adjustable weight 27(and change as required Different Weight and position, and with on screw fastening swing arm 26 or the main body 25), be used for regulating the weight (identical with the counterweight effect of Libra) of counterweight 5, to satisfy different metering needs.
The effect (operation principle) of the moving counterweight 5 of this embodiment is identical with above-described embodiment, just adopt swing arm 26 that the main body 25 of counterweight is connected with frame 1, so that moving counterweight 5 moves up and down is more flexible, can not produce resistance owing to the error that machinery cooperates, it is also more convenient to install and transport.
Referring to Fig. 7, the above embodiment of the present invention is taken over the outlet of 8 lower ends with its charging and directly is connected with the charging aperture 151 of extruder 15 by flange 21 when using, be characterized in simple in structure.But owing to be directly to be connected with extruder 15, extruder 15 is the certain vibrations of generation when work, and the weighing precision of meausring apparatus is had certain influence.In order further to improve weighing precision, can be provided with in the bottom of frame 1 and surface-mounted support 31.The charging aperture 151 that 8 lower ends outlets and extruder 15 are taken in described charging is oppositely arranged but leaves gap (not shown), or the outlet of 8 lower ends is taken in described charging is connected (two ends of flexible pipe 23 are fastenedly connected with box cupling and charging adapter 8 and charging aperture 151 respectively) with the charging aperture 151 of extruder 15 by flexible pipe 23.Like this, because whole meausring apparatus and extruder 15 directly is not rigidly connected, greatly reduce the operation vibration of extruder 15 to the impact of the weighing precision of meausring apparatus.
The course of work of the present invention and control principle are described as follows (producing plastic sheeting as example take the first embodiment):
The original state of system is to fill raw material in former hopper 1, the weight of the weight of fixed weight 12 and moving counterweight 5 according to designing requirement be configured (for example the weight of fixed weight 12 satisfy under scale hooper 7 does not have the situation of raw material or a small amount of raw material, be in the next; And the weight W of moving counterweight 5 is chosen as required).
1, after extruder 15 unlatching work, lower approach switch 13 sends the signal of blowing to controller 18, controller 18 regulating gate drive units 4 action starting gates 3, raw material is full of scale hooper 7 very soon, it is rear (in this process that weight reaches setting value, possible closing gate needs a process, probably be put into raw material in the scale hooper 7 greater than setting value, each blowing amount exists than big difference), scale hooper 7 downward fast moving are the next, the fixed weight 12 of lever 11 is jack-up moving counterweight 5 upwards, and the two all becomes upper.Approach switch 19 sends and stops the blowing signal on this moment, controller 18 regulating gate drive units 4 action closed shutters 3.
2, along with the running of extruder 15, the material level of the raw material in the scale hooper 7 slowly descends, fixed weight 12 descends synchronously with the moving counterweight 5 of its jack-up, when moving counterweight 5 drops to a certain setting height H2 by peak H1 (referring to Fig. 2 and Fig. 3), upper approach switch 19 sends the starting time signal, controller 18 beginning timing.Height H 2 is the distance of reaction of upper approach switch 19, selects as required the distance of reaction of upper approach switch 19, and general 3-5mm gets final product.
3, running along with extruder 15, the material level of the raw material in the scale hooper 7 continues to descend, fixed weight 12 descends synchronously with the moving counterweight 5 of its jack-up, when moving counterweight drops to for 5 times on the counterweight support 6, but because fixed weight 12 weight of the weight of the raw material in this moment scale hooper 7 during greater than poised state, so undergauge slide bar 51 lower ends of the top and moving counterweight 5 of fixed weight 12 do not disengage, the spacing of the following and lower approach switch 13 of fixed weight 12 is greater than working clearance s, and following approach switch 13 does not have induced signal output (referring to Fig. 4).
4, during the fixed weight 12 when the raw material weight in the scale hooper 7 is lower than poised state, fixed weight 12 descends and breaks away from moving counterweight 5, this at present approach switch 13 send the terminal time signal, controller 18 timing finish, the timing duration is T.In the 18 unit of account times of controller the use amount (being the raw material weight that enters extruder in the unit interval) of raw material for W/ T[wherein W be raw material weight (equilibrium relation according to the sky chessboard is calculated) in the scale hooper 7 that measures of moving counterweight 5, the weight that also can be designed to counterweight 5 equals the weight of scale hooper 7 interior raw materials, at this moment the weight of W=counterweight 5]; Meanwhile, lower approach switch 13 sends the signal of blowing to controller 18, and controller 18 regulating gate drive units 4 action starting gates 3 continue the next course of work (referring to Fig. 1).
Because said process is collection activity counterweight 5 and fixed weight 12 timing node when dropping to ad-hoc location, and no matter be put into during original state in the scale hooper 7 raw material greater than setting value than big difference, blowing weight (the situation that is higher than H2 corresponding to moving counterweight 5 that namely exceeds, when being H1) do not remember in controller 18, only have when moving counterweight 5 drops to height H 2 by peak H1, upper approach switch 19 just sends the starting time signal, controller 18 beginning timing.So this device has improved control accuracy.
The present invention utilizes the use amount W/ T of raw material in the unit interval to the uniformity control principle of extruder discharging (film) 17 unit weights, briefly explains as follows.
Because extruder do not have raw material in the scale hooper 7 when original state, so that fixed weight 12 1 ends of lever 11 are under action of gravitation is the next, scale hooper 7 is in upper.At every meter weight A of controller 18 setting (input) products, such as 1 gram/rice.If extruder uses the raw material weight W=1000g of a scale hooper 7.
Controller 18 calculates the employed duration T of raw material that extruder is whenever extruded a scale hooper 7, if this duration T is steady state value (such as 50 seconds), then controller 18 is controlled carry-over pinch rolls 16 according to certain rotation speed operation according to the product parameters of setting (film thickness or rice/gram).According to the above-mentioned parameter that provides, extruder per second load B=W/T=1000/50=20g/s, with extruder per second load B(20g/s) divided by every meter weight A(1g/m of product), the rotating speed V that namely obtains carry-over pinch rolls 16 should be 20m/s, and controller 18 is adjusted into 20m/s according to the rotating speed of the carry-over pinch rolls 16 that speed probe 20 detects to it.
Perhaps controller 18 is directly adjusted the rotating speed of the drive motors of carry-over pinch rolls 16 by controlling frequency converter 22, reaches the identical purpose that detects and adjust carry-over pinch rolls 16 rotating speeds with speed probe 20.Its operation principle is the frequency signal that controller 18 directly obtains frequency converter 22, adjust thus and calculate the rotating speed of the drive motors of carry-over pinch rolls 16, go out the rotating speed of carry-over pinch rolls 16 according to the speed ratio calculation of the drive motors of carry-over pinch rolls 16 and carry-over pinch rolls 16, the girth that multiply by carry-over pinch rolls 16 by the rotating speed of these carry-over pinch rolls 16 can obtain the per second length of extruded product again.The rotating speed of the drive motors by frequency converter 22 control carry-over pinch rolls 16 has overcome meter counter measurement products length because alignment error or the error of sliding and producing can obviously improve control accuracy.
When the rotating speed of extruder reduces owing to a variety of causes (impurity putty variation etc. being arranged such as voltage pulsation or plastics), so that charging rate is slack-off, above-mentioned duration T prolongs (such as 55s), the degree that this Time Controller 18 prolongs according to this duration calculates the rotating speed V=1000/55/1=18.18m/s of carry-over pinch rolls 16, reduces rotating speed; Or the rotating speed of raising extruder motor 14, to satisfy the requirement of every meter weight A=1g/m, keep the even thickness of membrane.
If the rotating speed of extruder accelerates, then charging rate improves, cause described duration T to shorten (such as 45s), the degree that this Time Controller 18 shortened according to this time interval calculates the rotating speed V=1000/45/1=22.22m/s of carry-over pinch rolls 16, improves the rotating speed of carry-over pinch rolls 16; Or the rotating speed of reduction extruder motor 14, to satisfy the requirement of every meter weight A=1g/m, automatically adjust film thickness thereby reach, make it keep uniform purpose.
The most outstanding characteristics of the present invention are to have adopted cooperatively interacting of fixed weight 12 and moving counterweight 5, can realize the record collection to the duration in initial stage (beginning timing) of the raw material in each scale hooper 7 that is full of and latter stage (timing is complete) at every turn, thereby can calculate " entering the interior raw material weight of extruder in the unit interval ".If when only having a fixed weight (being equivalent to fixed weight 12 is integrated with moving counterweight 5), when be full of raw material (such as 5 kilograms) in scale hooper 7 after, scale hooper 7 becomes the next, upper approach switch 19 sends and stops the blowing signal, and gate 3 is closed; Running along with extruder 15, the material level of the raw material in the scale hooper 7 slowly descends, when counterweight drops to a certain setting height H2 by peak H1 (as the raw material that is equivalent in the scale hooper 7 is 4.5 kilograms), upper approach switch 19 sends the time zero signal, and controller 18 just begins timing.But, raw material in the scale hooper 7 is when this weight, scale hooper 7 namely can be changed into upper, counterweight becomes the next, this at present approach switch 13 namely be triggered, controller 18 starting gates 3 blowings (beginning simultaneously timing), and this moment, scale hooper 7 interior raw materials only entered the extruder sub-fraction, the duration of timing is zero substantially.So can not realize calculating the function of " entering the raw material weight in the extruder in the unit interval ".
And fixed weight 12 of the present invention only the raw material in scale hooper 7 substantially be finished in (only having sub-fraction), just can become approach switch 13 under the next triggering by upper, timing just can finish.Begin to end from timing, the raw material that enters in the extruder is slightly less than scale hooper 7 raw material weights that are full of.(the calculating the weight of counterweight 5 and the weight relationships of scale hooper 7 interior raw materials according to the equation of equilibrium of sky chessboard) that the weight of fixed weight 12 and moving counterweight 5 determines and begin in the duration that finishes, to enter raw material weight in the extruder from timing.Can change as required the weight of counterweight 5.The input of W value is stored into controller 18, is automatically finished calculating and the whole control work of " entering the raw material weight in the extruder in the unit interval " by the program of controller 18.
The present invention also can be used for the application form of multimachine co-extrusion, and (many extruders are from an extrusion discharging, share one group of carry-over pinch rolls), every extruder uses separately cover control device of the present invention, the rotating speed of the mean value control carry-over pinch rolls of the W/T data that gather with every extruder, control principle is identical with above-mentioned single machine.Weighing precision of the present invention can reach 5/10000ths, improves an order of magnitude than prior art.
Claims (9)
1. the high precision in control device of a discharge weight per unit length of extruder, comprise controller and meausring apparatus, the input of this controller is connected with meausring apparatus, the output of this controller is connected with the drive motors of the extruding screw of extruder or the drive motors of carry-over pinch rolls, described meausring apparatus comprises former hopper, frame, scale hooper and charging adapter, the top and bottom that are installed in respectively frame are taken in former hopper and charging, in the outlet of the lower end of this former hopper gate is housed, this gate is connected with a gate driving device; Described scale hooper is installed between former hopper and the charging adapter, one side of this scale hooper is connected with an end of a lever, the other end of this lever is equipped with a fixed weight, the fulcrum of this lever is hinged on this frame, be provided with up and down position-limit mechanism at this lever, lower approach switch is housed below this fixed weight, it is characterized in that: above described fixed weight, be provided with moving counterweight, this moving counterweight is supported on the counterweight support actively, is provided with approach switch below this moving counterweight; Described moving counterweight is comprised of main body and the undergauge slide bar that is located at this main body lower end, this undergauge slide bar is supported on the described counterweight support with longitudinal sliding, all be in when the next at this fixed weight and moving counterweight, leave the working clearance between the undergauge slide bar lower end of the top and moving counterweight of this fixed weight; The lower end central authorities of this undergauge slide bar are sphere or tip; The controlled end of this gate driving device, upper approach switch and lower approach switch are connected with described controller respectively.
2. the high precision in control device of discharge weight per unit length of extruder according to claim 1, it is characterized in that: be provided with longitudinal hole at described counterweight support, at this longitudinal hole linear bearing is housed, in the centre bore of this linear bearing, inserts the undergauge slide bar of described moving counterweight lower end with being slidingly matched.
3. the high precision in control device of discharge weight per unit length of extruder according to claim 2, it is characterized in that: described moving counterweight is discoid, described undergauge slide bar is cylindrical, and coaxial with this moving counterweight.
4. the high precision in control device of a discharge weight per unit length of extruder, comprise controller and meausring apparatus, the input of this controller is connected with meausring apparatus, the output of this controller is connected with the drive motors of the extruding screw of extruder or the drive motors of carry-over pinch rolls, described meausring apparatus comprises former hopper, frame, scale hooper and charging adapter, the top and bottom that are installed in respectively frame are taken in former hopper and charging, in the outlet of the lower end of this former hopper gate is housed, this gate is connected with a gate driving device; Described scale hooper is installed between former hopper and the charging adapter, one side of this scale hooper is connected with an end of a lever, the other end of this lever is equipped with a fixed weight, the fulcrum of this lever is hinged on this frame, be provided with up and down position-limit mechanism at this lever, lower approach switch is housed below this fixed weight, it is characterized in that: above described fixed weight, be provided with moving counterweight, this moving counterweight is supported on the counterweight support actively, is provided with approach switch below this moving counterweight; Described moving counterweight is comprised of main body and swing arm, and an end and the described frame of this swing arm are hinged, and the other end is connected with this main body; Upper end in described fixed weight is provided with push rod, on the top of this push rod roller is housed; All be in when the next at this fixed weight and moving counterweight, leave the working clearance between the top of the roller on this push rod and moving counterweight following; The controlled end of this gate driving device, upper approach switch and lower approach switch are connected with described controller respectively.
5. the high precision in control device of discharge weight per unit length of extruder according to claim 4, it is characterized in that: main body or swing arm at described moving counterweight are provided with adjustable weight.
6. it is characterized in that according to claim 1 or the high precision in control device of 4 described discharge weight per unit length of extruders: described gate driving device adopts fluid cylinder, cylinder or electric device; Described controller adopts microcomputer or Programmable Logic Controller.
7. it is characterized in that: at described carry-over pinch rolls speed probe is housed, and is connected with described controller according to claim 1 or the high precision in control device of 4 described discharge weight per unit length of extruders.
8. according to claim 1 or the high precision in control device of 4 described discharge weight per unit length of extruders, it is characterized in that: the output of described controller is connected with the drive motors of described carry-over pinch rolls by frequency converter, has saved speed probe.
9. it is characterized in that: be provided with and surface-mounted support in the bottom of described frame according to claim 1 or the high precision in control device of 4 described discharge weight per unit length of extruders; The charging aperture that lower end outlet and extruder are taken in described charging is oppositely arranged but leaves the gap, or the lower end outlet is taken in described charging is connected with the charging aperture of extruder by flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103358560A CN102366999B (en) | 2011-08-26 | 2011-10-31 | High precision automatic control device for weight per unit length of material discharged from extruder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102478705A CN102275292A (en) | 2011-08-26 | 2011-08-26 | High-precision automatic control device for weight per unit length of material discharged by extruder |
| CN201110247870.5 | 2011-08-26 | ||
| CN2011103358560A CN102366999B (en) | 2011-08-26 | 2011-10-31 | High precision automatic control device for weight per unit length of material discharged from extruder |
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| CN102366999A CN102366999A (en) | 2012-03-07 |
| CN102366999B true CN102366999B (en) | 2013-10-23 |
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| CN2011102478705A Withdrawn CN102275292A (en) | 2011-08-26 | 2011-08-26 | High-precision automatic control device for weight per unit length of material discharged by extruder |
| CN2011103358560A Expired - Fee Related CN102366999B (en) | 2011-08-26 | 2011-10-31 | High precision automatic control device for weight per unit length of material discharged from extruder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102673840B (en) * | 2012-05-24 | 2014-10-29 | 中联重科股份有限公司 | Method, device and system for controlling material supplement and packager |
| CN104400976A (en) * | 2014-11-26 | 2015-03-11 | 铜陵中发三佳科技股份有限公司 | SPVC (soft polyvinyl chloride)+PVC (polyvinyl chloride) hard and soft post coextrusion adjustment positioning device |
| CN104985794A (en) * | 2015-07-20 | 2015-10-21 | 河南亚都实业有限公司 | Medical tube plastic extruding machine |
| CN106003576A (en) * | 2016-06-29 | 2016-10-12 | 芜湖新泉汽车饰件系统有限公司 | Concentrated feeding device of injection molding machine |
| CN109895346A (en) * | 2019-03-29 | 2019-06-18 | 温州奥翔包装机械有限公司 | Single layer extrusion, multi-layer co-extruded film production process |
| CN114777714B (en) * | 2022-03-31 | 2024-03-01 | 广东康怡卫生用品有限公司 | Sanitary product thickness measuring method |
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|---|---|---|---|---|
| CA2368755A1 (en) * | 1999-04-06 | 2000-10-12 | Maguire Products, Inc. | Extrusion apparatus and method |
| CN1817616A (en) * | 2006-03-27 | 2006-08-16 | 王根乐 | Method for controlling film thickness automatically and weighing device thereof |
| CN2925827Y (en) * | 2006-04-30 | 2007-07-25 | 马镇鑫 | Automatic plastic material feeder |
| CN202336998U (en) * | 2011-08-26 | 2012-07-18 | 王根乐 | High-precision automatic control device for length and weight of discharge unit of extruder |
| JP5104609B2 (en) * | 2008-07-14 | 2012-12-19 | セイコーエプソン株式会社 | Liquid ejecting head, liquid ejecting apparatus, and piezoelectric element |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104609A (en) * | 1991-10-16 | 1993-04-27 | Mitsubishi Heavy Ind Ltd | Vent extruding machine |
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2011
- 2011-08-26 CN CN2011102478705A patent/CN102275292A/en not_active Withdrawn
- 2011-10-31 CN CN2011103358560A patent/CN102366999B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2368755A1 (en) * | 1999-04-06 | 2000-10-12 | Maguire Products, Inc. | Extrusion apparatus and method |
| CN1817616A (en) * | 2006-03-27 | 2006-08-16 | 王根乐 | Method for controlling film thickness automatically and weighing device thereof |
| CN2925827Y (en) * | 2006-04-30 | 2007-07-25 | 马镇鑫 | Automatic plastic material feeder |
| JP5104609B2 (en) * | 2008-07-14 | 2012-12-19 | セイコーエプソン株式会社 | Liquid ejecting head, liquid ejecting apparatus, and piezoelectric element |
| CN202336998U (en) * | 2011-08-26 | 2012-07-18 | 王根乐 | High-precision automatic control device for length and weight of discharge unit of extruder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102366999A (en) | 2012-03-07 |
| CN102275292A (en) | 2011-12-14 |
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