描述
砂轮机通常用于修磨刀具。高速旋转的砂轮装在电动机的轴上,与电动机转子同速旋转。虽然它也只要电机单向旋转,但由于工作时粉尘太多,不宜采用开启式负荷开关,而封闭式负荷开关又不适宜频繁操作,所以砂轮机一般采用万能转换开关控制。图1-9时两台砂轮机的电路图。
控制原理与特点:
(1)万能转换开关SA1(或SA2)的旋转按钮置于Ⅰ(开),三相电源与电动机接通,砂轮电机起动运转,置于位置Ⅱ(关),砂轮电机停。因组合开关没有短路保护功能,所以电路中接入熔断器的闸刀开关或铁壳开关,也可以是断路器,用它来隔离电源,并起到短路保护作用。
(2)由于砂轮与电机轴的连接是用螺帽固定的,所以砂轮罩壳上用箭头指示了砂轮的旋转方向,如果反向旋转,有可能因旋转惯性使螺帽松开而造成高速旋转的砂轮飞出的重大事故。在接砂轮电机的电源时,切记先试它的转向是否与箭头方向一致。
2.转换开关(组合开关)和万能转换开关
(1)组合开关
转换开关又称组合开关,图1-10是HZ10系列组合开关外形与结构图。转换开关实质上是一种特殊刀开关,是操作手柄在与安装面平行的平面内左右转动的刀开关。只不过一般刀开关的操作手柄是在垂直安装面的平面内向上或向下转动,而组合开关的操作手柄则是平行于安装面的平面内向左或向右转动而已。多用在机床电气控制线路中,作为电源的引入开关,也可以用作不频繁地接通和断开电路、换接电源和负载以及控制5KW以下的小容量电动机的正反转和星三角起动等。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
Woodward 8236-043 Interface 43027
Woodward 8236-144 Light Panel
Woodward 8236-144D Light Panel
Woodward 8238-002 505E Bulkhead
Woodward 8238-007 505 Bulkhead
Woodward 8238-008 505 Flush Mount
Woodward 8238-009 505E Bulkhead
Woodward 8239-001 DSM Synchronizer
Woodward 8239-002 DSM Synchronizer
Woodward 8239-005 DRFD
Woodward 8239-006 Digital Remote Final Driver
Woodward 8239-007 Digital Remote Final Driver
Woodward 8239-008 Digital Remote Final Driver
Woodward 8239-015 Digital Remote Final Driver
Woodward 8239-016 DRFD CONTROL ASSEMBLY
Woodward 8239-939
Woodward 8240-084 EGB10C governor
Woodward 8250-022 remote servo
Woodward 8250-226 EG10P p/n A8250-226
Woodward 8250-421 EG3P oil motor
Woodward 8250-501 actuator
Woodward 8250-570
Woodward 8250-807 TA-20 Actuator
Woodward 8250-818 Governor
Woodward 8256-021 EPG Actuator
Woodward 8270-092 EG-A Control Box
Woodward 8270-122 2301 Power Supply,p/n
Woodward 8270-201
Woodward 8270-741 MOTOR OPERATED POTENTIOMETER
Woodward 8270-758 2301 SIGNAL CONVERTER
Woodward 8270-768 2301 AMPLIFIER
Woodward 8271-147 Load Sensor
Woodward 8271-467 2301 Load Share and Speed Control
Woodward 8271-472 2301 Load Sharing&Speed Control
Woodward 8271-652 2301 Load Share and Speed Control
Woodward 8271-674 Power Supplies
Woodward 8271-872 Import/Export Control
Woodward 8272-385 SPM Synchronizer
Woodward 8272-394 Real Power Sensor
Woodward 8272-447 Motor Operated Pot
Woodward 8272-464
Woodward 8272-684
Woodward 8272-684
Woodward 8272-695 Real Power Sensor
Woodward 8272-720 Real Power Sensor
Woodward 8272-781A Real Power Sensor
Woodward 8273-041 ATLAS SC
Woodward 8273-276 377A7823P001,Atlas PC 2×4 Sc w/act,LV
Woodward 8280-071 Hydraulic Pump
Woodward 8280-415 Digital Speed Control
Woodward 8280-505 723 Plus
Woodward 8290-195 Flo-Tech Speed Control
Woodward 8291-020 EHPC
Woodward 8301-633 MicroNet
Woodward 8405-020
Woodward 8406-113 EGCP-3 DIGITAL CONTROL
Woodward 8406-121 EGCP-2
Woodward 8434-246 Main Chassises w/LED&P.B
Woodward 8512-135
Woodward 8516-038
Woodward 8516-039 TG 13
Woodward 8516-042 4000 RPM CCW
Woodward 8516-051 TG-13E,4000 RPM,CCW MS CONN
Woodward 8516-068 TG-13E Actuator,Pressure Drive
Woodward 8516-076 TG-13A
Woodward 8570-412 PG Dial Governor,p/n C8570-412
Woodward 8575-241
Woodward 8575-377
Woodward 8580-064 Tachometer CIT Sensor
Woodward 8580-069 On Engine Gearbox Hydraulic Pump for Metering Valves
Woodward 8580-071 Engine Gearbox Hydraulic Pump
Woodward 8580-085 Engine Gearbox Hydraulic Pump
Woodward 8580-086 Hydraulic Pump
Woodward 8900-067 Sensor
Woodward 8901-457 CPC
Woodward 8901-881 Fuel/Water Valve
Woodward 8904-289 Valve
Woodward 8904-484 Gas Shutoff Valve with Suppression
Woodward 8904-773 Control 8904-881,9902-002
Woodward 8915-004 1907 Liquid valve with TM-55 Actuator
Woodward 8915-005 3103 Gas Valve with TM-55 Actuator
Woodward 8915-011 Control Valve-TM55P/3103 Low Temp Gas Fuel
Woodward 8915-024 Liquid Fuel Valve
Woodward 8915-046 Control Valve-TM55P/1907 Liq
Woodward 8915-075 Control Valve-TM40LP/3151A Water
Woodward 8915-094 Control Valve-TM55P/3103 High Temp Gas Fuel
Woodward 8915-103 Control Valve-TM40/Liquid LP
Woodward 8915-111
Woodward 8915-1146 3103/EM35 GAS VALVE