国内不卡一二三四区,欧美日韩一级电影,美国毛片基地a级e片,欧美日韩在线观看免费

簡(jiǎn)述：故障現象:離心機是醫院和科研機構必不可的 重要設備之一,它的好壞直接影響到被離心物的離心質(zhì)量"本人在檢修一臺速度不穩的離心機時(shí),發(fā)現無(wú)論是高速還是低速都不穩定"

故障現象:離心機是醫院和科研機構必不可的
    重要設備之一,它的好壞直接影響到被離心物的離心質(zhì)量"本人在檢修一臺速度不穩的離心機時(shí),發(fā)現無(wú)論是高速還是低速都不穩定"
    故障檢修:該離心機是一臺直流式調速電機,其速度的快慢是通過(guò)可調電阻改變可控硅的導通角度,再由可控硅控制整流后到達電機兩端的電壓,以達到控制速度的目的"電機轉速不穩,從原理上分析,以下四種情況都有可能" Fault phenomenon: centrifuge is a hospital and research institutions will not be

重要設備之一,它的好壞直接影響到被離心物的離心質(zhì)量"本人在檢修一臺速度不穩的離心機時(shí),發(fā)現無(wú)論是高速還是低速都不穩定"

One of the important equipment, it has a direct impact on the quality of "by centrifugal centrifugal compound I in the maintenance of a speed instability, that whether high or low is not stable"

故障檢修:該離心機是一臺直流式調速電機,其速度的快慢是通過(guò)可調電阻改變可控硅的導通角度,再由可控硅控制整流后到達電機兩端的電壓,以達到控制速度的目的"電機轉速不穩,從原理上分析,以下四種情況都有可能"

Troubleshooting: the centrifuge type motor is a DC, its speed is adjustable resistance change through the thyristor conduction angle, then the controlled silicon controlled rectifier to voltage of two ends of the motor, in order to control the speed of the motor speed instability ", from the principle of the analysis, the following four kinds of circumstances there may be"

    (1)可調電阻,因可調電阻安裝在控制面板上,使用頻率非常高,時(shí)間長(cháng)了,出現接觸不良的情況很普通"
    (2)可控硅出現問(wèn)題的也不少,通常是擊穿短路,開(kāi)路,不能觸發(fā)或內部接觸不良等"
    (3)四個(gè)整流二極管中的某一只有問(wèn)題"
    (4)電機轉子與整流子之間有碳粉或碳刷本身不良等"本著(zhù)先易后難的修理原則,首先測量可調電阻,阻值隨調節而有規律的變化,證明電位器是好的"再測量可控硅也未發(fā)現問(wèn)題"在測量四只整流二極管時(shí),發(fā)現有一只時(shí)好時(shí)壞,由于該二極管是大電流金封管"一端上螺絲緊固在電路板上,另一頭用線(xiàn)焊接到電路板上"從電路板上拆下時(shí),發(fā)現正負極有松動(dòng)現象,再一邊測量一邊搖動(dòng),證實(shí)該二極管時(shí)好時(shí)壞"由于該管型號無(wú)法看清,就把同規格的管子裝上,通電開(kāi)機轉速很快,認為剛的管子擊穿,拆下測量完好無(wú)損"測量其他三只二極管也正常"但就在比較測量時(shí),發(fā)現兩種型號的二極管正負極性完全相反(即上螺絲的一端有正極性的,也有負極性的)"所以在安裝時(shí)一定要注意最好用同型號的,同規格的元件"當換上同規格同型號的元件時(shí),通電試機,一切恢復正常"

(1) the adjustable resistor, the adjustable resistor is arranged on the control panel, use frequency is very high, a long time, contact undesirable situation is very common"

(2)可控硅出現問(wèn)題的也不少,通常是擊穿短路,開(kāi)路,不能觸發(fā)或內部接觸不良等"

(2) silicon controlled problems also many, usually short circuit, open circuit, cannot trigger or internal bad contact "

(3)四個(gè)整流二極管中的某一只有問(wèn)題"

(3) four rectifier diodes in a only"

(4)電機轉子與整流子之間有碳粉或碳刷本身不良等"本著(zhù)先易后難的修理原則,首先測量可調電阻,阻值隨調節而有規律的變化,證明電位器是好的"再測量可控硅也未發(fā)現問(wèn)題"在測量四只整流二極管時(shí),發(fā)現有一只時(shí)好時(shí)壞,由于該二極管是大電流金封管"一端上螺絲緊固在電路板上,另一頭用線(xiàn)焊接到電路板上"從電路板上拆下時(shí),發(fā)現正負極有松動(dòng)現象,再一邊測量一邊搖動(dòng),證實(shí)該二極管時(shí)好時(shí)壞"由于該管型號無(wú)法看清,就把同規格的管子裝上,通電開(kāi)機轉速很快,認為剛的管子擊穿,拆下測量完好無(wú)損"測量其他三只二極管也正常"但就在比較測量時(shí),發(fā)現兩種型號的二極管正負極性完全相反(即上螺絲的一端有正極性的,也有負極性的)"所以在安裝時(shí)一定要注意最好用同型號的,同規格的元件"當換上同規格同型號的元件時(shí),通電試機,一切恢復正常"

(4) between the motor rotor and commutator or brush carbon itself "in poor repair Principle difficult first easy hind, the first measurement of adjustable resistance, resistance with regulation and regular changes, that is to measure the potentiometer SCR good" did not find the problem "in the measurement of four rectifier diodes, found there is a HERSHEY'S bad, because the diode is the current gold seal tube" end fastening screws on the circuit board, the other end with wire soldered to the circuit board "removed from the circuit board, found that the negative pole loosening, again while measuring a shaking, confirmed that the diode HERSHEY'S bad" because the pipe model cannot see, the same specifications pipe installed, electricity power speed quickly, just think the tube breakdown, remove measuring intact "measurement of the other three diodes are normal" but in the comparison measurement, found the diode plus or minus two types of opposite polarity (i.e. end screw with positive polarity, also have negative polarity) "so when installed, must pay attention to the best use of the same model with the specifications of the components," when replaced with same specification and same type components, power test machine, everything back to normal"