CN102035461B - Frequency conversion control system and method of paper shredder - Google Patents
Frequency conversion control system and method of paper shredder Download PDFInfo
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- CN102035461B CN102035461B CN 200910178426 CN200910178426A CN102035461B CN 102035461 B CN102035461 B CN 102035461B CN 200910178426 CN200910178426 CN 200910178426 CN 200910178426 A CN200910178426 A CN 200910178426A CN 102035461 B CN102035461 B CN 102035461B
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Abstract
The invention relates to frequency conversion control system and method of a paper shredder. The frequency conversion control system comprises a thickness sensor, a variable speed motor and a control module, wherein the control module is connected with the thickness sensor and the variable speed motor and provided with a contrast table; the thickness sensor is used for sensing the thickness of an object to be shredded entering the paper shredder; and the variable speed motor can be operated with different motor rotating speeds. When the control module receives the thickness information of the object to be shredded from the thickness sensor, the control module searches motor operation data corresponding to the thickness in the contrast table according to the thickness of the object to be shredded, outputs the motor operation data to the variable speed motor so as to control the operation of the variable speed motor at proper rotating speed, therefore, the energy source waste is avoided. The frequency conversion control system and method of the paper shredder have the advantages of saving energy source, and the like.
Description
Technical field
The present invention relates to the shredder field, particularly a kind of frequency-changing control system of shredder and method for controlling frequency conversion.
Background technology
Shredder is rubbing when to be minced, if thickness to be minced is too thick, for example waiting to mince is that a stacker is opened, disc, and thickness is when exceeding the permissible scope of shredder, just the situations such as paperboard (Jamming) can occur.And paperboard is when occuring, and shredder then can't move, and paperboard is when serious, even can damage shredder.Occur for fear of above-mentioned situation, the common practice is that thickness measurement mechanism is set in shredder especially at present, whether surpasses the scope that shredder can work to detect thickness to be minced.
See also Fig. 1, it is existing partial structurtes schematic diagram with shredder of thickness measurement mechanism.In the shredder 1, paper inlet 11 is located at the top in shredded paper path 12, and supports the side that element 13 is positioned at shredded paper path 12, and paper sheet thickness detecting mechanism 14 is arranged at the rear of supporting element 13.Among Fig. 1, thickness measurement mechanism 14 is comprised of the optical transmitting set 141 and the optical receiver 142 that are arranged on the backward mobile route of supporting element 13, and thickness measurement mechanism 104 and the thickness measurement mechanisms of supporting the single element form of element 13 common compositions.The terminal point in shredded paper path 12 is provided with paper shredding cutters group 17, and linked gear group 16 is between paper shredding cutters group 17 and CD-ROM drive motor 15, and mesh with paper shredding cutters group 17 and CD-ROM drive motor 15 respectively, make paper shredding cutters group 17 carry out the shredded paper action with the driving of CD-ROM drive motor 15 synchronously.
Among Fig. 1, have the shredder 1 of supporting element 13 when rubbing object, wait to mince (not being shown among this figure) entered the shredded paper path 12 of shredder 1 by paper inlet 11.Next, wait to mince and touch and support element 13 in shredded paper path 12, make that to support element 13 mobile and cause a shift length backward, at this moment, thickness measurement mechanism 14 sensings are supported element 13 and whether are moved to backward the degree that can cover light sensing fully.That is to say, mobile shift length is not enough to cover the light sensing that is produced by optical transmitting set 141 fully and when optical receiver 142 can't be received, waiting to mince was allowed to continue to advance in shredded paper path 12 and carry out the shredded paper action backward in case support that element 13 is supported; But when opposite situation, 1 of shredder stops all operations.
Wherein, be not enough to cover the light sensing that is produced by optical transmitting set 141 fully to supporting the shift length that element 13 causes if wait to mince, represent that thickness to be minced can be accepted by shredder 1.Therefore, wait to mince and to continue in shredded paper path 12, to advance, and when waiting to mince near paper shredding cutters group 17, be arranged in the shredded paper transducer (not being shown in figure) of supporting element 13 belows and sense to be minced approaching, and the linked gear group 16 that makes CD-ROM drive motor 15 and be connected in CD-ROM drive motor 15 begins to rotate, and then drives synchronously paper shredding cutters group 17 and treat to mince and carry out the shredded paper action.
The shredder 1 of element 13 and thickness measurement mechanism 14 is supported in setting, can judge that thickness to be minced is whether in the range of safety operation of shredder according to the magnitude relationship of shift length, and then utilize this device to avoid the situation generation of the faults such as paperboard, and prolong the useful life of shredder 1.
In the modern times that awareness of saving energy promotes, above-mentioned existing shredder 1 is not provided with energy-saving mechanism.Illustrate: in the situation that be no more than its permissible range, when enter paper cutting passage 12 wait to mince when being five, the CD-ROM drive motor 15 of shredder 1 is rotated with a fixed rotating speed and is offered fixedly shredded paper torsion of paper shredding cutters 17 1, waits to mince so that paper shredding cutters 17 rubs five with fixing shredded paper torsion; And when enter paper cutting passage 12 wait to mince when being two, CD-ROM drive motor 15 is also rotated with fixed rotating speed and is made paper shredding cutters 17 still rub two with fixing shredded paper torsion to wait to mince.Hence one can see that, no matter existing shredder 1 enters the quantity to be minced of paper cutting passage 12 for what, all rubs with same shredded paper torsion and wait to mince, after long-time the use, the energy of shredder 1 waste is considerable, therefore, but the shredder of a kind of energy savings of needs.
Summary of the invention
The technical problem to be solved in the present invention is, for the prior art above shortcomings, but provides a kind of frequency-changing control system and method for shredder of energy savings.
The technical solution adopted for the present invention to solve the technical problems provides a kind of frequency-changing control system of shredder, and this frequency-changing control system comprises:
Thickness transducer enters a thickness to be minced of this shredder and exports a thickness signal according to its thickness in order to detecting;
Variable speed driver is in order to rotate with the first motor rotary speed or the second motor rotary speed and to provide power to this shredder; And
Control module, be connected in this variable speed driver and this thickness transducer, and has first table of comparisons, wherein this control module receives this thickness signal, and from this first table of comparisons, obtain motor frequency value and motor voltage value that should thickness signal, and this motor frequency value and this motor voltage value is exported to this variable speed driver and control this variable speed driver with this first motor rotary speed or the rotation of this second motor rotary speed, and this control module comprises:
Converter unit is connected in an AC power, in order to receive from the alternating current of this AC power and to change frequency and the voltage of this alternating current; And
Control unit, be connected in this converter unit and this thickness transducer, in order to receiving this thickness signal, and by obtaining in this first table of comparisons this motor frequency value and this motor voltage value that should thickness signal, and export this motor frequency value and this motor voltage value to this converter unit.
This first table of comparisons comprises the first one-tenth-value thickness 1/10 and corresponding to the first motor frequency value and the first motor voltage value of this first one-tenth-value thickness 1/10, when this thickness to be minced equaled this first one-tenth-value thickness 1/10, this control module was exported this first motor frequency value and this first motor voltage value so that this variable speed driver rotates with this first motor rotary speed corresponding to this first one-tenth-value thickness 1/10.
This first table of comparisons comprises the second one-tenth-value thickness 1/10 and corresponding to the second motor frequency value and the second motor voltage value of this second one-tenth-value thickness 1/10, when this thickness to be minced equaled this second one-tenth-value thickness 1/10, this control module was exported this second motor frequency value and this second motor voltage value so that this variable speed driver rotates with this second motor rotary speed corresponding to this second one-tenth-value thickness 1/10.
This second one-tenth-value thickness 1/10 is greater than this first one-tenth-value thickness 1/10, and this second motor rotary speed is less than this first motor rotary speed.
This converter unit is converted to direct current with this alternating current, and this direct current is converted to three-phase alternating current, and wherein the frequency of this three-phase alternating current equals this first motor frequency value, and the voltage of this three-phase alternating current equals this first motor voltage value.
The frequency-changing control system of described shredder also comprises the motor supervision module, this motor supervision module is connected in this control module and this variable speed driver, in order to monitoring the usefulness of this variable speed driver, this motor supervision module comprises detecting the temperature sensor of the temperature of this variable speed driver, in order to the speed probe of the rotating speed of detecting this variable speed driver and in order to the current sensor of the electric current of detecting this variable speed driver.
The rotating speed of controlling this variable speed driver when this control module equals this first motor rotary speed, but this speed probe detects the rotating speed of this variable speed driver when being greater than or less than this first motor rotary speed, this speed probe output speed compensating signal is given this control module, so that this control module reduces or promote the rotating speed of this variable speed driver.
The numerical value of this first motor rotary speed is described in this first table of comparisons.
This current sensor also comprises the electric current admissible error, the electric current of controlling this variable speed driver when this control module equals the first motor current value, but the difference that this current sensor detects the electric current of this variable speed driver and this first motor current value is during greater than this electric current admissible error, and this current sensor output current detection signal is with the announcement of warning.
This first motor current value is described in this first table of comparisons.
When the temperature of this variable speed driver during more than or equal to preset temperature value, this temperature sensor output pick-off signal is given this control module, so that this control module stops the operation of this variable speed driver.
The frequency-changing control system of described shredder also comprises a paper-in sensor, this paper-in sensor is connected in this control module, wait to mince whether enter this shredder in order to detect this, wherein wait to mince when entering this shredder when this, this paper-in sensor output enabling signal is given this control module, so that this control module begins to receive this thickness signal from this thickness transducer.
The frequency-changing control system of described shredder also comprises mode selector switch, with so that this shredder switches to the second pattern by first mode, wherein this control module also comprises second table of comparisons corresponding to this second pattern, comprises that setting motor frequency value and first corresponding to first of this thickness signal sets the motor voltage value; When this shredder was switched to this second pattern, this control module was exported this according to this second table of comparisons and first is set motor frequency value and this first and set the motor voltage value to this variable speed driver, makes this variable speed driver set motor rotary speed with first and rotates.
This first mode is an energy saver mode, and this second pattern is a fast mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this fast mode are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
This first mode is an energy saver mode, and this second pattern is a stillness mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this stillness mode are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first motor rotary speed is greater than this first quiet motor rotary speed.
This first mode is a fast mode, and this second pattern is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this setting the first motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first high-speed motor rotating speed is greater than this first quiet motor rotary speed.
This mode selector switch also can switch to three-mode by this first mode or this second pattern; Wherein this first mode is an energy saver mode, this second pattern is a fast mode, and this three-mode is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first quiet motor rotary speed is less than this first motor rotary speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
The present invention also provides a kind of method for controlling frequency conversion, in order to control the shredded paper speed of a shredder, this shredder comprises thickness transducer, variable speed driver and first table of comparisons, and this first table of comparisons has a plurality of one-tenth-value thickness 1/10s and corresponding to a plurality of motor frequency values and a plurality of motor voltage value of these a plurality of one-tenth-value thickness 1/10s, the method may further comprise the steps:
Utilize the detecting of this thickness transducer to enter a thickness to be minced of this shredder;
In these a plurality of one-tenth-value thickness 1/10s of this first table of comparisons, search the first one-tenth-value thickness 1/10 or the second one-tenth-value thickness 1/10 that should thickness;
In these a plurality of motor frequency values of this first table of comparisons and this a plurality of motor voltage values, search the first motor frequency value and the first motor voltage value that should the first one-tenth-value thickness 1/10, or by search in this a plurality of motor frequency values of this first table of comparisons and this a plurality of motor voltage values to the second motor frequency value and the second motor voltage value that should the second one-tenth-value thickness 1/10; And
Exporting this first motor frequency value and this first motor voltage value controls this variable speed driver and rotates with the first motor rotary speed to this variable speed driver, or export this second motor frequency value and this second motor voltage value and control this variable speed driver and rotate with the second motor rotary speed to this variable speed driver, wherein this second one-tenth-value thickness 1/10 is greater than this first one-tenth-value thickness 1/10, and this second motor rotary speed is less than this first motor rotary speed.
The present invention also provides a kind of method for controlling frequency conversion, in order to control the shredded paper speed of a shredder, this shredder comprises thickness transducer, variable speed driver, first table of comparisons and second table of comparisons, and this first table of comparisons has a plurality of one-tenth-value thickness 1/10s and corresponding to a plurality of motor frequency values and a plurality of motor voltage value of these a plurality of one-tenth-value thickness 1/10s, and this second table of comparisons has a plurality of thickness value and corresponding to a plurality of setting motor frequency values and a plurality of setting motor voltage value of these a plurality of thickness value, the method may further comprise the steps:
Selecting this shredder to be under first mode or the second pattern moves; Wherein when this first mode is selected, adopt this first table of comparisons, and when this second pattern is selected, adopt this second table of comparisons;
Utilize the detecting of this thickness transducer to enter a thickness to be minced of this shredder;
In these a plurality of thickness value of this first table of comparisons or this second table of comparisons, search the first one-tenth-value thickness 1/10 that should thickness;
Obtain to set motor frequency value and the first setting motor voltage value corresponding to the first motor frequency value and the first motor voltage value or first of this first one-tenth-value thickness 1/10 according to this first one-tenth-value thickness 1/10; And
Export this first motor frequency value and this first motor voltage value or this first setting motor frequency value and this first setting motor voltage value and control this variable speed driver to this variable speed driver with the first motor rotary speed or the first setting motor rotary speed rotation.
This first mode is an energy saver mode, and this second pattern is a fast mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this fast mode are respectively the first high-speed motor frequency values, this first high-speed motor magnitude of voltage and this first high-speed motor rotating speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
This first mode is an energy saver mode, and this second pattern is a stillness mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this stillness mode are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first motor rotary speed is greater than this first quiet motor rotary speed.
This first mode is a fast mode, and this second pattern is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first high-speed motor rotating speed is greater than this first quiet motor rotary speed.
Described method for controlling frequency conversion also comprises three-mode, wherein this first mode is an energy saver mode, this second pattern is a fast mode, and this three-mode is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first quiet motor rotary speed is less than this first motor rotary speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
The frequency-changing control system of shredder of the present invention and method for controlling frequency conversion decide according to thickness to be minced provides to variable speed driver for how much power, make its with suitable rotation speed operation to save the energy; In addition, the frequency-changing control system of shredder of the present invention also provides the table of comparisons to control the rotating speed of variable speed driver according to the thickness to be minced that detects, so that control unit does not need its thickness is calculated and can know the power that should offer variable speed driver, therefore the frequency-changing control system of shredder of the present invention can be saved operation time, and does not need more too that the control unit of high-order can move; Except having energy-conservation effect, the frequency-changing control system of shredder of the present invention also provides fast mode, variable speed driver is turned round, to save the shredded paper time, to satisfy user user's demand in permissible range with maximum speed.Compared with prior art, adopt shredder of the present invention really can save many energy.
Description of drawings
Fig. 1 is existing partial structurtes schematic diagram with shredder of thickness measurement mechanism;
Fig. 2 is the block flow diagram of method for controlling frequency conversion the first preferred embodiment of the present invention;
Fig. 3 is the system schematic of frequency-changing control system first preferred embodiment of shredder of the present invention;
Fig. 4 is the block flow diagram of method for controlling frequency conversion the second preferred embodiment of the present invention;
Fig. 5 is the system schematic of frequency-changing control system second preferred embodiment of shredder of the present invention.
Embodiment
In view of existing shredder does not have energy-saving mechanism and causes the waste of the energy, the invention provides a kind of frequency-changing control system of shredder and method for controlling frequency conversion to improve the deficiency of existing shredder.Method for controlling frequency conversion of the present invention is to utilize detecting to enter the thickness to be minced of shredder, and according to the thickness to be minced that at every turn enters shredder promote or the rotating speed that reduces variable speed driver to avoid the waste of the energy.
See also Fig. 2, it is for the block flow diagram of method for controlling frequency conversion the first preferred embodiment of the present invention.Method for controlling frequency conversion of the present invention comprises: step S1---utilize the thickness transducer detecting to enter the thickness to be minced of shredder; Step S2---in a plurality of one-tenth-value thickness 1/10s of first table of comparisons, search the first one-tenth-value thickness 1/10 of corresponding thickness; Step S3---in a plurality of motor frequency values of first table of comparisons and a plurality of motor voltage value, search the first motor frequency value and the first motor voltage value of corresponding the first one-tenth-value thickness 1/10; And step S4---export the first motor frequency value and the first motor voltage value is controlled variable speed driver and rotated with the first motor rotary speed to variable speed driver.By above-mentioned steps as can be known, method for controlling frequency conversion of the present invention is motor frequency value and the motor voltage value of searching according to the determinand thickness that measures and in first table of comparisons should thickness, with the rotating speed of control variable speed driver.
See also Fig. 3 about the mechanism that implements method for controlling frequency conversion, it is the system schematic of frequency-changing control system first preferred embodiment of shredder of the present invention.The frequency-changing control system 20 of shredder 2 comprises a thickness transducer 21, a variable speed driver 22 and a control module 23, thickness transducer 21 is connected in control module 23, in order to detecting enter shredder 2 wait mince the thickness of (not being shown among the figure) and export a thickness signal to control module 23 according to its thickness.Variable speed driver 22 is in order to rotate with one first motor rotary speed or one second motor rotary speed and to provide power to shredder 2, and in this preferred embodiment, variable speed driver 22 is a three-phase alternating current motor.And control module 23 is connected in variable speed driver 22 and thickness transducer 21, and has one first table of comparisons 2321, control module 23 is in order to receiving thickness signal T and to search in first table of comparisons 2321 motor frequency value and motor voltage value that should thickness signal, and exports this motor frequency value and this motor voltage value to variable speed driver 22 and control variable speed driver 22 rotates with this first motor rotary speed or this second motor rotary speed.
In this preferred embodiment, control module 23 comprises converter unit 231 and control unit 232, and converter unit 231 is connected in an AC power 26, in order to receive from the alternating current of AC power 26 and to change frequency and the voltage of this alternating current.And control unit 232 is connected in converter unit 231 and thickness transducer 21, in order to receive thickness signal, and by obtaining in first table of comparisons 2321 motor frequency value and motor voltage value that should thickness signal, and export this motor frequency value and this motor voltage value to converter unit 231, wherein converter unit 231 is a digital signal processor (Digital Signal Processor, DSP).And first table of comparisons 2321 records the data of motor operation, shown in it thes contents are as follows:
In this preferred embodiment, first table of comparisons 2321 is default number corresponding to the unit of thickness to be minced, certainly, the thickness to be minced in the table of comparisons is not to be limited to take default number as unit, can set thickness unit's (for example millimeter) expression that measures yet.The number that 2321 records of first table of comparisons remain to be minced is variable speed driver 22 service datas---the first motor frequency value F of 1 o'clock
1, the first motor voltage value V
1, the first motor current value I
1, the first motor rotary speed RPM
1Numerical value, and number to be minced is 2 o'clock variable speed driver 22 service datas---the second motor frequency value F
2, the second motor voltage value V
2, the second motor current value I
2, the second motor rotary speed RPM
2Numerical value etc., by that analogy.In first table of comparisons 2321, the first motor frequency value F
1Greater than final motor frequency value F
n, and the first motor rotary speed RPM
1Greater than final motor rotary speed RPM
nAnd the data in first table of comparisons 2321 are to obtain by repeatedly testing, and make variable speed driver 22 can carry out shredded paper work and the saving energy with the data run in first table of comparisons 2321.
Frequency-changing control system 20 is tabled look-up in first table of comparisons 2321 according to thickness to be minced and is obtained to export to frequency and the voltage of variable speed driver 22, the spirit of frequency-changing control system 20 of the present invention is by control module 23 variable speed driver 22 to be rotated with the motor rotary speed in first table of comparisons 2321, therefore, whether normal operation then need to arrange a motor supervision module 24 to variable speed driver 22 in frequency-changing control system 20, in order to monitor the usefulness of variable speed driver 22.Among Fig. 3, motor supervision module 24 comprises a temperature sensor 241, a speed probe 242 and a current sensor 243.Temperature sensor 241 is in order to detecting the temperature of variable speed driver 22, and speed probe 242 is in order to detecting the rotating speed of variable speed driver 22, and current sensor 243 is in order to detect the electric current of variable speed driver 22.
In addition, frequency-changing control system 20 also arranges a paper-in sensor 25, make paper-in sensor 25 be connected in control module 23, whether enter shredder 2 in order to detect determinand, when determinand enters shredder 2, paper-in sensor 25 output one enabling signal to control module 23 so that control module 23 begins to receive the thickness signal from thickness transducer 21.Really be that thickness transducer 21 detects the thickness signal that thickness to be minced is exported by the signal that paper-in sensor 25 guarantees that control module 23 receives is set.And paper-in sensor 25 also can detect determinand and whether leave shredder 2, after determinand leaves shredder 2, thickness transducer 21 made zero in order to detect the thickness of next determinand.
Next the ruuning situation of the frequency-changing control system 20 of shredder 2 is described, please continue to consult Fig. 3, when entering shredder 2 when waiting to mince, paper-in sensor 25 detects and to be minced enters and export enabling signal E to the control unit 232 of control module 23, makes control unit 232 begin to receive thickness signal from thickness transducer 21.On the other hand, thickness detector 21 detects thickness to be minced, and for example the thickness of determinand is a default number, and thickness detector 21 outputs one thickness signal T, wherein thickness signal T is comprising the information that thickness is a default number.After control unit 232 received thickness signal T, by the one-tenth-value thickness 1/10 of searching in first table of comparisons 2321 corresponding to thickness signal T, namely number was 1, and can obtain number by first table of comparisons 2321 is variable speed driver 22 service datas---the first motor frequency value F of 1 o'clock
1, the first motor voltage value V
1, the first motor current value I
1, the first motor rotary speed RPM
1Numerical value.And control unit 232 outputs the first motor frequency value F
1, the first motor voltage value V
1Give converter unit 231.
Receive the first motor frequency value F
1, the first motor voltage value V
1Converter unit 231 also receive alternating current from AC power 26, and converter unit 231 is converted to a direct current 27 with alternating current, and direct current 27 is converted to a three-phase alternating current 28, wherein the frequency of three-phase alternating current 28 equals the first motor frequency value F1, and the voltage of three-phase alternating current 28 equals the first motor voltage value V
1Next three-phase alternating current 28 is output to variable speed driver 22, makes variable speed driver 22 with the first motor rotary speed RPM
1Rotate.In like manner, when thickness detector 21 detects thickness to be minced when being two default numbers, control unit 232 is according to the thickness signal T of the information that includes two default numbers and by the one-tenth-value thickness 1/10 (being that number is 2) of searching in first table of comparisons 2321 corresponding to thickness signal T, output is the second motor frequency value F of 2 o'clock corresponding to number by first table of comparisons 2321
2And the second motor voltage value V
2Give variable speed driver 22, make variable speed driver 22 with the second motor rotary speed RPM
2Rotate.
In variable speed driver 22 runnings, the speed probe 242 of motor supervision module 24 and current sensor 243 whether monitoring variable speed driver 22 as first table of comparisons 2321 in data handling row: when the rotating speed of the control unit 232 control variable speed drivers 22 of control module 23 equals the first motor rotary speed RPM
1, but speed probe 242 detects the rotating speed of variable speed driver 22 greater than the first motor rotary speed RPM
1The time, one rotating speed compensating signal RC is to control unit 232 in speed probe 242 outputs, so that control unit 232 reduces the rotating speed of variable speed driver 22, so that the rotating speed of variable speed driver 22 equals the first motor rotary speed RPM
1Otherwise, when the rotating speed of variable speed driver 22 less than the first motor rotary speed RPM
1The time, 232 rotating speeds that promote variable speed driver 22 of control unit are so that the rotating speed of variable speed driver 22 equals the first motor rotary speed RPM
1And with optimal rotating speed operation.In brief, speed probe 242 is a kind of loop circuit servo system of controlling rotating speed.
Whether the electric current of then detecting variable speed driver in order to the current sensor 243 of the electric current of detecting variable speed driver 22 equals the first motor current value I1, and wherein current sensor 243 is provided with an electric current admissible error.In this preferred embodiment, the electric current admissible error is set to positive and negative ten Percent, the difference that detects the electric current of variable speed driver 22 and the first motor current value I1 when current sensor 243 is during greater than default ten Percent, and current sensor 243 outputs one current sense signal CD is unusual with warning user motor operation.
In addition, also be provided with a preset temperature value in the control unit 232, when the temperature of variable speed driver 22 then represents that variable speed driver 22 is overheated during more than or equal to preset temperature value and needs to have a rest, overheated and burn for fear of variable speed driver 22, the temperature sensor 241 of motor supervision module 24 will be detected its temperature when variable speed driver 22 running, when the temperature of variable speed driver 22 during more than or equal to preset temperature value, temperature sensor 241 outputs one pick-off signal S is to the control unit 232 of control module 23, so that control unit 232 stops the operation of variable speed driver 22.The temperature sensor 241 of motor supervision module 24 is to arrange in order to protect variable speed driver 22, and speed probe 242 and current sensor 243 are to be able to data run in first table of comparisons 2321 in order to ensure variable speed driver 22.
Frequency-changing control system of the present invention and method thereof be control variable speed driver 22 move with the data in first table of comparisons 2321 and the accurately shredded paper work of reaching to reduce the waste of the energy.In addition, in order to provide more complete function to the user, the present invention also provides another preferred embodiment of frequency-changing control system and the method for controlling frequency conversion of shredder.
See also Fig. 4, it is for the block flow diagram of method for controlling frequency conversion the second preferred embodiment of the present invention.Method for controlling frequency conversion of the present invention comprises: step S1 '---select shredder to be under energy saver mode or the fast mode and move; Step S2 '---utilize the thickness transducer detecting to enter the thickness to be minced of shredder.When selecting energy saver mode, enter step S3 '---in a plurality of thickness value of first table of comparisons, search the first one-tenth-value thickness 1/10 of corresponding thickness.Next step S4 '---obtain the first motor frequency value and the first motor voltage value corresponding to the first one-tenth-value thickness 1/10 according to the first one-tenth-value thickness 1/10.Final step S5 '---export the first motor frequency value and the first motor voltage value is controlled variable speed driver and rotated with the first motor rotary speed to variable speed driver, energy saver mode finishes.
And when selecting fast mode, enter step S6 '---by the first one-tenth-value thickness 1/10 of searching corresponding thickness in a plurality of thickness value of second table of comparisons.Next step S7 '---obtain the first high-speed motor frequency values and the first high-speed motor magnitude of voltage corresponding to the first one-tenth-value thickness 1/10 according to the first one-tenth-value thickness 1/10.Final step S8 '---export the first high-speed motor frequency values and the first high-speed motor magnitude of voltage is controlled variable speed driver with the first high-speed motor rotational speed to variable speed driver, fast mode finishes.By above-mentioned steps as can be known, the method for controlling frequency conversion of the second preferred embodiment can be in energy saver mode or fast mode operation by selecting shredder, but wishes that to satisfy the user shredder has power saving or timesaving function.
Next see also Fig. 5, it is the system schematic of frequency-changing control system in the second preferred embodiment of shredder of the present invention.The frequency-changing control system 30 of shredder 3 comprises a thickness transducer 31, a variable speed driver 32, a control module 33, a motor supervision module 34, a paper-in sensor 35 and a mode selector switch 39, the frequency-changing control system 20 of the structure of frequency-changing control system 30 and the first preferred embodiment is almost identical haply, and no longer adds explanation.Its difference is that frequency-changing control system 30 additionally arranges mode selector switch 39, with so that shredder 3 switches to fast mode by energy saver mode, or switch to energy saver mode by fast mode, and when shredder 3 was switched to energy saver mode, control module 33 was exported motor frequency value and motor voltage value to variable speed driver 32 according to first table of comparisons 3321 (identical with first table of comparisons 2321 of the first preferred embodiment).In addition, the control unit 332 of the control module 33 of frequency-changing control system 30 also comprises one second table of comparisons 3322, record the service data at shredder 3 is selected when being in fast mode variable speed driver 32, and second table of comparisons 3322 is as follows:
The number that 3322 records of second table of comparisons remain to be minced is variable speed driver 32 service datas---the first high-speed motor frequency value F of 1 o'clock
1 *, the first high-speed motor magnitude of voltage V
1 *, the first high-speed motor current value I
1 *, the first high-speed motor rotating speed RPM
1 *Numerical value and number to be minced variable speed driver 32 service datas---the third high speed motor frequency value F that is at 3 o'clock
3 *, third high speed motor magnitude of voltage V
3 *, third high speed motor current value I
3 *, third high speed motor rotating speed RPM
3 *Numerical value etc., by that analogy.In second table of comparisons 3322, the first high-speed motor frequency value F
1 *Greater than final high-speed motor frequency value F
n *, and the first high-speed motor rotating speed RPM
1 *Greater than final high-speed motor rotating speed RPM
n *Compare the first high-speed motor rotating speed RPM with first table of comparisons 3321
1 *Greater than the first motor rotary speed RPM
1, and final high-speed motor rotating speed RPM
n *Greater than final motor rotary speed RPM
nData in second table of comparisons 3322 also obtain by repeatedly testing, and make variable speed driver 22 can carry out the work of high speed shredded paper with the data run in second table of comparisons 3322.
Next the ruuning situation of the frequency-changing control system 30 of shredder 3 is described, please continue to consult Fig. 5, when shredder 3 is selected as energy saver mode, and wait to mince (not being shown among the figure) when entering shredder 3, paper-in sensor 35 detects to be minced entering and exports enabling signal E ' to the control unit 332 of control module 33, makes control unit 332 begin to receive thickness signal from thickness transducer 31.For example the thickness of determinand is a default number, and thickness detector 31 detects thickness to be minced and exports that to comprise thickness be that the thickness signal T ' of information of a default number is to control unit 332, make control unit 332 by the one-tenth-value thickness 1/10 (being that number is 1) of searching in first table of comparisons 3321 corresponding to thickness signal T ', and export the first motor frequency value F
1, the first motor voltage value V
1 Give converter unit 331.
On the other hand, converter unit 331 receives the alternating current from AC power 36, and alternating current is converted to a direct current 37, again direct current 37 is converted to three-phase alternating current 38, and the frequency of three-phase alternating current 38 equals the first motor frequency value F
1, and the voltage of three-phase alternating current 38 equals the first motor voltage value V
1Next three-phase alternating current 38 is output to variable speed driver 32, makes variable speed driver 32 with the first motor rotary speed RPM
1Rotate and can save the energy.
And urgently wish will to wait to mince when rubbing as the user, utilize mode selector switch 39, shredder 3 is switched to fast mode by energy saver mode.Wait to mince when entering shredder 3 when three, paper-in sensor 35 detects and to be minced enters and export enabling signal E ', and thickness detector 31 detects thickness to be minced and output packet contains the thickness signal T ' of three preset thickness information and gives control unit 332, and control unit 332 is searched the one-tenth-value thickness 1/10 (being that number is 3) corresponding to thickness signal T ' in second table of comparisons 3322, and output third high speed motor frequency value F
3 *And third high speed motor magnitude of voltage V
3 *Give converter unit 331.Converter unit 331 is according to third high speed motor frequency value F
3 *And third high speed motor magnitude of voltage V
3 *And alternating current is converted to three-phase alternating current 38, and output three-phase alternating current 38 makes it with third high speed motor rotating speed RPM to variable speed driver 32
3 *Rotate.
In variable speed driver 32 runnings, whether the temperature sensor 341 of motor supervision module 34, speed probe 342 and current sensor 343 are being monitored variable speed driver 22 and are being worked as the data in first table of comparisons 3321 or second table of comparisons 3322, the ruuning situation of motor supervision module 34 is identical with the first preferred embodiment, and repeats no more.What need special instruction is, this preferred embodiment is only take first mode as energy saver mode, and the second pattern is that fast mode illustrates, and non-limiting first mode is energy saver mode, and the second pattern is fast mode, and first mode and the second pattern also can be set as other pattern.
In addition, in view of lightening shredder is placed in the office usually, and the noise that shredder when operation produces is quite large, therefore usually causes clerical workforce's burden acoustically.Therefore, the frequency-changing control system of shredder of the present invention also can provide the 3rd preferred embodiment, and the frequency-changing control system of the structure of the frequency-changing control system of the 3rd preferred embodiment and the second preferred embodiment is almost identical, and no longer adds explanation.Its difference only is that frequency-changing control system additionally arranges three-mode, and its three-mode is a stillness mode.And comprise the numerical value that a plurality of quiet motor frequency values, a plurality of quiet motor voltage value, a plurality of quiet motor current value and a plurality of quiet motor turn corresponding to the service data that the 3rd table of comparisons of stillness mode is put down in writing, the 3rd table of comparisons is as follows:
What need special instruction is the first quiet motor rotary speed RPM
1' than the first motor rotary speed RPM
1Slowly, therefore can produce less noise.And the quiet motor frequency value of the frequency-changing control system adjustment of shredder and quiet motor voltage value and make motor to rotate and to have simultaneously the torsion of shredded paper than the quiet motor rotary speed of low speed.
From the above, the frequency-changing control system of shredder of the present invention and method for controlling frequency conversion decide according to thickness to be minced provides to variable speed driver for how much power, make its with suitable rotation speed operation to save the energy.In addition, the frequency-changing control system of shredder of the present invention also provides the table of comparisons to control the rotating speed of variable speed driver according to the thickness to be minced that detects, so that control unit does not need its thickness is calculated and can know the power that should offer variable speed driver, therefore the frequency-changing control system of shredder of the present invention can be saved operation time, and does not need more too that the control unit of high-order can move.
Except having energy-conservation effect, the frequency-changing control system of shredder of the present invention also provides fast mode, variable speed driver is turned round, to save the shredded paper time, to satisfy user's demand in permissible range with maximum speed.Compared with prior art, shredder of the present invention can be saved many energy really.
The above is preferred embodiment of the present invention only, is not to limit claim of the present invention, and therefore all other do not break away from the equivalence change of finishing under the disclosed spirit or modify, and all should be contained in the claim of the present invention.
Claims (23)
1. the frequency-changing control system of a shredder is characterized in that, this frequency-changing control system comprises:
Thickness transducer enters a thickness to be minced of this shredder and exports a thickness signal according to its thickness in order to detecting;
Variable speed driver is in order to rotate with the first motor rotary speed or the second motor rotary speed and to provide power to this shredder; And
Control module, be connected in this variable speed driver and this thickness transducer, and has first table of comparisons, wherein this control module receives this thickness signal, and from this first table of comparisons, obtain motor frequency value and motor voltage value that should thickness signal, and this motor frequency value and this motor voltage value is exported to this variable speed driver and control this variable speed driver with this first motor rotary speed or the rotation of this second motor rotary speed, and this control module comprises:
Converter unit is connected in an AC power, in order to receive from the alternating current of this AC power and to change frequency and the voltage of this alternating current; And
Control unit, be connected in this converter unit and this thickness transducer, in order to receiving this thickness signal, and by obtaining in this first table of comparisons this motor frequency value and this motor voltage value that should thickness signal, and export this motor frequency value and this motor voltage value to this converter unit.
2. frequency-changing control system as claimed in claim 1, it is characterized in that: this first table of comparisons comprises the first one-tenth-value thickness 1/10 and corresponding to the first motor frequency value and the first motor voltage value of this first one-tenth-value thickness 1/10, when this thickness to be minced equaled this first one-tenth-value thickness 1/10, this control module was exported this first motor frequency value and this first motor voltage value so that this variable speed driver rotates with this first motor rotary speed corresponding to this first one-tenth-value thickness 1/10.
3. the frequency-changing control system of shredder as claimed in claim 2, it is characterized in that: this first table of comparisons comprises the second one-tenth-value thickness 1/10 and corresponding to the second motor frequency value and the second motor voltage value of this second one-tenth-value thickness 1/10, when this thickness to be minced equaled this second one-tenth-value thickness 1/10, this control module was exported this second motor frequency value and this second motor voltage value so that this variable speed driver rotates with this second motor rotary speed corresponding to this second one-tenth-value thickness 1/10.
4. the frequency-changing control system of shredder as claimed in claim 3, it is characterized in that: this second one-tenth-value thickness 1/10 is greater than this first one-tenth-value thickness 1/10, and this second motor rotary speed is less than this first motor rotary speed.
5. the frequency-changing control system of shredder as claimed in claim 2, it is characterized in that: this converter unit is converted to direct current with this alternating current, and this direct current is converted to three-phase alternating current, wherein the frequency of this three-phase alternating current equals this first motor frequency value, and the voltage of this three-phase alternating current equals this first motor voltage value.
6. the frequency-changing control system of shredder as claimed in claim 1, it is characterized in that: also comprise the motor supervision module, this motor supervision module is connected in this control module and this variable speed driver, in order to monitoring the usefulness of this variable speed driver, this motor supervision module comprises detecting the temperature sensor of the temperature of this variable speed driver, in order to the speed probe of the rotating speed of detecting this variable speed driver and in order to the current sensor of the electric current of detecting this variable speed driver.
7. the frequency-changing control system of shredder as claimed in claim 6, it is characterized in that: the rotating speed of controlling this variable speed driver when this control module equals this first motor rotary speed, but this speed probe detects the rotating speed of this variable speed driver when being greater than or less than this first motor rotary speed, this speed probe output speed compensating signal is given this control module, so that this control module reduces or promote the rotating speed of this variable speed driver.
8. the frequency-changing control system of shredder as claimed in claim 7, it is characterized in that: the numerical value of this first motor rotary speed is described in this first table of comparisons.
9. the frequency-changing control system of shredder as claimed in claim 6, it is characterized in that: this current sensor also comprises the electric current admissible error, the electric current of controlling this variable speed driver when this control module equals the first motor current value, but the difference that this current sensor detects the electric current of this variable speed driver and this first motor current value is during greater than this electric current admissible error, and this current sensor output current detection signal is with the announcement of warning.
10. the frequency-changing control system of shredder as claimed in claim 9, it is characterized in that: this first motor current value is described in this first table of comparisons.
11. the frequency-changing control system of shredder as claimed in claim 6, it is characterized in that: when the temperature of this variable speed driver during more than or equal to preset temperature value, this temperature sensor output pick-off signal is given this control module, so that this control module stops the operation of this variable speed driver.
12. the frequency-changing control system of shredder as claimed in claim 1, it is characterized in that: also comprise a paper-in sensor, this paper-in sensor is connected in this control module, wait to mince whether enter this shredder in order to detect this, wherein wait to mince when entering this shredder when this, this paper-in sensor output enabling signal is given this control module, so that this control module begins to receive this thickness signal from this thickness transducer.
13. the frequency-changing control system of shredder as claimed in claim 1, it is characterized in that: also comprise mode selector switch, with so that this shredder switches to the second pattern by first mode, wherein this control module also comprises second table of comparisons corresponding to this second pattern, comprises that setting motor frequency value and first corresponding to first of this thickness signal sets the motor voltage value; When this shredder was switched to this second pattern, this control module was exported this according to this second table of comparisons and first is set motor frequency value and this first and set the motor voltage value to this variable speed driver, makes this variable speed driver set motor rotary speed with first and rotates.
14. the frequency-changing control system of shredder as claimed in claim 13, it is characterized in that: this first mode is an energy saver mode, and this second pattern is a fast mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this fast mode are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
15. the frequency-changing control system of shredder as claimed in claim 13, it is characterized in that: this first mode is an energy saver mode, and this second pattern is a stillness mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this stillness mode are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first motor rotary speed is greater than this first quiet motor rotary speed.
16. the frequency-changing control system of shredder as claimed in claim 13, it is characterized in that: this first mode is a fast mode, and this second pattern is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first high-speed motor rotating speed is greater than this first quiet motor rotary speed.
17. the frequency-changing control system of shredder as claimed in claim 13 is characterized in that: this mode selector switch also can switch to three-mode by this first mode or this second pattern; Wherein this first mode is an energy saver mode, this second pattern is a fast mode, and this three-mode is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first quiet motor rotary speed is less than this first motor rotary speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
18. method for controlling frequency conversion, in order to control the shredded paper speed of a shredder, it is characterized in that, this shredder comprises thickness transducer, variable speed driver and first table of comparisons, and this first table of comparisons has a plurality of one-tenth-value thickness 1/10s and corresponding to a plurality of motor frequency values and a plurality of motor voltage value of these a plurality of one-tenth-value thickness 1/10s, the method may further comprise the steps:
Utilize the detecting of this thickness transducer to enter a thickness to be minced of this shredder;
In these a plurality of one-tenth-value thickness 1/10s of this first table of comparisons, search the first one-tenth-value thickness 1/10 or the second one-tenth-value thickness 1/10 that should thickness;
In these a plurality of motor frequency values of this first table of comparisons and this a plurality of motor voltage values, search the first motor frequency value and the first motor voltage value that should the first one-tenth-value thickness 1/10, or by search in this a plurality of motor frequency values of this first table of comparisons and this a plurality of motor voltage values to the second motor frequency value and the second motor voltage value that should the second one-tenth-value thickness 1/10; And
Exporting this first motor frequency value and this first motor voltage value controls this variable speed driver and rotates with the first motor rotary speed to this variable speed driver, or export this second motor frequency value and this second motor voltage value and control this variable speed driver and rotate with the second motor rotary speed to this variable speed driver, wherein this second one-tenth-value thickness 1/10 is greater than this first one-tenth-value thickness 1/10, and this second motor rotary speed is less than this first motor rotary speed.
19. method for controlling frequency conversion, in order to control the shredded paper speed of a shredder, it is characterized in that, this shredder comprises thickness transducer, variable speed driver, first table of comparisons and second table of comparisons, and this first table of comparisons has a plurality of one-tenth-value thickness 1/10s and corresponding to a plurality of motor frequency values and a plurality of motor voltage value of these a plurality of one-tenth-value thickness 1/10s, and this second table of comparisons has a plurality of thickness value and corresponding to a plurality of setting motor frequency values and a plurality of setting motor voltage value of these a plurality of thickness value, the method may further comprise the steps:
Selecting this shredder to be under first mode or the second pattern moves; Wherein when this first mode is selected, adopt this first table of comparisons, and when this second pattern is selected, adopt this second table of comparisons;
Utilize the detecting of this thickness transducer to enter a thickness to be minced of this shredder;
In these a plurality of thickness value of this first table of comparisons or this second table of comparisons, search the first one-tenth-value thickness 1/10 that should thickness;
Obtain to set motor frequency value and the first setting motor voltage value corresponding to the first motor frequency value and the first motor voltage value or first of this first one-tenth-value thickness 1/10 according to this first one-tenth-value thickness 1/10; And
Export this first motor frequency value and this first motor voltage value or this first setting motor frequency value and this first setting motor voltage value and control this variable speed driver to this variable speed driver with the first motor rotary speed or the first setting motor rotary speed rotation.
20. method for controlling frequency conversion as claimed in claim 19, it is characterized in that: this first mode is an energy saver mode, and this second pattern is a fast mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this fast mode are respectively the first high-speed motor frequency values, this first high-speed motor magnitude of voltage and this first high-speed motor rotating speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
21. method for controlling frequency conversion as claimed in claim 19, it is characterized in that: this first mode is an energy saver mode, and this second pattern is a stillness mode, and this first setting motor frequency value, this first setting motor voltage value and this first setting motor rotary speed corresponding to this stillness mode are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first motor rotary speed is greater than this first quiet motor rotary speed.
22. method for controlling frequency conversion as claimed in claim 19, it is characterized in that: this first mode is a fast mode, and this second pattern is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first high-speed motor rotating speed is greater than this first quiet motor rotary speed.
23. method for controlling frequency conversion as claimed in claim 19, it is characterized in that: also comprise three-mode, wherein this first mode is an energy saver mode, this second pattern is a fast mode, and this three-mode is a stillness mode, and this first setting motor frequency value corresponding to this fast mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first high-speed motor frequency values, the first high-speed motor magnitude of voltage and the first high-speed motor rotating speed, and first set motor frequency value corresponding to this of this stillness mode, this first setting motor voltage value and this first setting motor rotary speed are respectively the first quiet motor frequency value, the first quiet motor voltage value and the first quiet motor rotary speed, and this first quiet motor rotary speed is less than this first motor rotary speed, and this first motor rotary speed is less than this first high-speed motor rotating speed.
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| CN102035461B (en) * | 2009-09-24 | 2013-03-27 | 致伸科技股份有限公司 | Frequency conversion control system and method of paper shredder |
| CN102830350B (en) * | 2012-08-28 | 2014-09-10 | 广州广电计量检测股份有限公司 | Device for controlling force applied by switch life testing machine and application method of device |
| CN103438012A (en) * | 2013-08-30 | 2013-12-11 | 重庆哈丁科技有限公司 | Frequency modulation type wind speed control and display system and setting method thereof |
| CN104457795B (en) * | 2013-09-17 | 2017-02-01 | 上海震旦办公设备有限公司 | Paper jamming judgment method for paper shredder |
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