CN206599382U - A kind of tower crane control protects system - Google Patents
A kind of tower crane control protects system Download PDFInfo
- Publication number
- CN206599382U CN206599382U CN201720180634.9U CN201720180634U CN206599382U CN 206599382 U CN206599382 U CN 206599382U CN 201720180634 U CN201720180634 U CN 201720180634U CN 206599382 U CN206599382 U CN 206599382U
- Authority
- CN
- China
- Prior art keywords
- relay
- control
- coil
- normally
- control relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
A kind of tower crane control protection system of the utility model, belongs to the technical field of crane control protection；The technical problem of solution is：There is provided a kind of stability preferable tower crane control protection system；The technical scheme used for：A kind of tower crane control protects system, including dc source, motor to rotate forward control circuit, motor reversal control circuit, power switch SA1, limiter of moment Q1, guard relay KA1, time relay KT1, buzzer HA1, early warning indicator lamp HL1, alarm release switch SB0 and control relay KA2；Suitable for the technical field of motor control.
Description
Technical field
A kind of tower crane control protection system of the utility model, belongs to the technical field of crane control protection.
Background technology
Derrick crane, sometimes because of external wind or itself lifting weight, makes the tower body of crane in normal work
Generating period is rocked, and is caused limiter of moment frequent trigger force square switch in critical condition, is caused tower crane control
Motor exports start stop signal, in view of the above-mentioned problems, the way of in the market is：Band bow formula power is set on existing derrick crane
The control system of square limiter, but the signal for bending formula limiter of moment is only directly acted on circuit control by this system, is drawn
The frequent start-stop of institute's controlled motor is played, the stability and reliability of control is not high, and using effect is poor.
Utility model content
The utility model overcomes the shortcomings of that prior art is present, and technical problem to be solved is：A kind of stability is provided
Preferable tower crane control protection system.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is：A kind of tower crane control is protected
Protecting system, including dc source, motor rotate forward control circuit, motor reversal control circuit, power switch SA1, limiter of moment
Q1, guard relay KA1, time relay KT1, buzzer HA1, early warning indicator lamp HL1, alarm release switch SB0 and control
Relay KA2；The power switch SA1 is serially connected on the circuit between dc source and external 220V alternating current input power supplyings, institute
State one end, guard relay KA1 normally opened contact KA1.1 that the output plus terminal of dc source is switched with limiter of moment Q1 respectively
One end, time relay KT1 normally-closed contact KT1.1 one end, alarm release switch SB0 one end, motor rotate forward control
The input A0 of circuit, guard relay KA1 normally-closed contact KA1.2 one end are connected, and it is another that the square limiter Q1 is switched
One end one end respectively with time relay KT1 normally-closed contact KT1.2, time relay KT1 coil KT1.3 one end phase
Even, one end phase of the normally-closed contact KT1.2 of the time relay KT1 other end and guard relay KA1 coil KA1.3
Even, output negative terminal, the time relay KT1 of the coil KA1.3 of the guard relay KA1 other end respectively with dc source
The coil KT1.3 other end, early warning indicator lamp HL1 one end, guard relay KA1 reset switch REST one end, honeybee
Ring device HA1 one end, control relay KA2 coil KA2.1 one end, motor rotate forward input A1, the motor for controlling circuit
The input B0 of reverse turn control circuit is connected, the other end of the early warning indicator lamp HL1 and guard relay KA1 normally opened contact
The KA1.1 other end is connected；The normally-closed contact KT1.1 of the time relay KT1 other end respectively with guard relay KA1
The reset switch REST other end, the buzzer HA1 other end, control relay KA2 coil KA2.1 other end phase
Even；After the normally-closed contact KA1.2 of guard relay KA1 other end concatenation control relay KA2 normally-closed contact KA2.2
It is connected with motor reversal control circuit input end B1.
Preferably, the motor rotates forward control circuit and included：Control relay KA3, control relay KA4, switch SB1,
SB2 is switched, the motor reversal control circuit includes：Control relay KA5, control relay KA6, switch SB3, switch SB4；
The coil KA3.1 of control relay KA3 one end, control relay KA4 coil KA4.1 one end with the motor
The input A1 for rotating forward control circuit is connected, the coil KA3.1 of the control relay KA3 other end be sequentially connected in series control after
The input A0 of control circuit is rotated forward with motor, switch SB2 one end phase after electrical equipment KA5 normally-closed contact KA5.2, switch SB1
Even, the coil after the other end concatenation control relay KA6 of switch SB2 normally-closed contact KA6.2 with control relay KA4
The KA4.1 other end is connected；The normally opened contact KA3.3 of the control relay KA3 is serially connected in the line of controlled motor level rotating forward
Lu Shang, the control relay KA4 normally opened contact KA4.3 are serially connected on the circuit of controlled motor or so rotating forward；The control
Relay KA5 coil KA5.1 one end, control relay KA6 coil KA6.1 one end are controlled with the motor reversal
The input B1 of circuit is connected, and the coil KA5.1 of the control relay KA5 other end is sequentially connected in series control relay KA3
Normally-closed contact KA3.2, switch SB3 after with motor reversal control circuit input B0, switch SB4 one end be connected, it is described
With control relay KA6 coil KA6.1's after the normally-closed contact KA4.2 for the other end concatenation control relay KA4 for switching SB4
The other end is connected；The normally opened contact KA5.3 of the control relay KA5 is serially connected on the circuit of controlled motor horizontal inversion, institute
The normally opened contact KA6.3 for stating control relay KA6 is serially connected on the circuit of controlled motor or so reversion.
Preferably, A.C. contactor KM1 is provided with the circuit that the controlled motor level is rotated forward, the controlled motor is left
It is provided with the circuit of right rotating forward on A.C. contactor KM3, the circuit of the controlled motor horizontal inversion and is provided with ac contactor
Device KM2：A.C. contactor KM4 is provided with the circuit of described controlled motor or so reversion；The coil of the A.C. contactor KM1
KM1.1 one end one end respectively with the coil KM2.1 of the A.C. contactor KM2, A.C. contactor KM3 coil KM3.1
One end, A.C. contactor KM4 coil KM4.1 one end, alternating current 220V voltage zero line side N be connected, the coil of the KM1
The KM1.1 other end is sequentially connected in series A.C. contactor KM3 normally-closed contact KM3.2, control relay KA3 normally opened contact
It is connected after KA3.3 with the zero line L of alternating current 220V voltage；The zero line L of the alternating current 220V voltage is also respectively with controlling relay
Device KA5 normally opened contact KA5.3 one end, control relay KA4 normally opened contact KA4.3 one end, control relay KA6
Normally opened contact KA6.3 one end is connected；The normally opened contact KA5.3 of control relay KA5 other end concatenation ac contactor
The other end of coil KM2.1 after device KM4 normally-closed contact KM4.2 with A.C. contactor KM2 is connected；The control relay
With A.C. contactor KM3's after KA4 normally opened contact KA4.3 other end concatenation A.C. contactor KM1 normally-closed contact KM1.2
The coil KM3.1 other end is connected；The normally opened contact KA6.3 of control relay KA6 other end concatenation A.C. contactor
The other end of coil KM4.1 after KM2 normally-closed contact KM2.2 with A.C. contactor KM4 is connected.
Preferably, in addition to power supply indicator HL2, one end of the power supply indicator HL2 and the output of dc source are just
End is connected, and the other end of the power supply indicator HL2 is connected with the output negative terminal of dc source, and the limiter of moment Q1 is bow
Formula limiter of moment.
The utility model has the advantages that compared with prior art.
The utility model is avoided because of external environment or misoperation, and caused derrick crane is rocked, limiter of moment
Triggering, the maloperation phenomenon produced, it is to avoid the machine infringement that motor frequent starting is caused, improve system stability and can
By property.
Brief description of the drawings
The utility model is described in more detail below in conjunction with the accompanying drawings.
Fig. 1 is traditional motor control structural representation；
Fig. 2 is electrical block diagram of the present utility model；
Fig. 3 is motor positive/reverse rotation circuit schematic diagram；
In figure：1 is dc source, and 2 be that motor rotates forward control circuit, and 3 be that motor reversal controls circuit.
Embodiment
Fig. 1 is traditional motor control structural representation, as shown in Figure 1 between exchange 380V input powers and motor M
Air switch A1QL1 is provided with, the A.C. contactor A1KM1 rotated forward for controlled motor is provided between air switch A1QL1 and motor M,
With the A.C. contactor A1KM2 inverted for controlled motor.
As shown in Figure 2 and Figure 3, a kind of tower crane control protection system, including dc source 1, motor rotate forward control electricity
Road 2, motor reversal control circuit 3, power switch SA1, limiter of moment Q1, guard relay KA1, time relay KT1, honeybee
Ring device HA1, early warning indicator lamp HL1, alarm release switch SB0 and control relay KA2；The power switch SA1 is serially connected in directly
Flow on the circuit between power supply 1 and external 220V alternating current input power supplyings, the output plus terminal of the dc source 1 is limited with torque respectively
One end of device Q1 switches processed, guard relay KA1 normally opened contact KA1.1 one end, time relay KT1 normally-closed contact
KT1.1 one end, alarm release switch SB0 one end, motor rotate forward the input A0 of control circuit 2, guard relay KA1
Normally-closed contact KA1.2 one end is connected, and the other end of the square limiter Q1 switches is touched with the normally closed of time relay KT1 respectively
Point KT1.2 one end, time relay KT1 coil KT1.3 one end are connected, the normally-closed contact of the time relay KT1
The KT1.2 other end is connected with guard relay KA1 coil KA1.3 one end, the coil of the guard relay KA1
The output negative terminal, the time relay KT1 coil KT1.3 other end, early warning of the KA1.3 other end respectively with dc source 1
Indicator lamp HL1 one end, guard relay KA1 reset switch REST one end, buzzer HA1 one end, control relay
KA2 coil KA2.1 one end, motor rotate forward the input B0 that the input A1 of control circuit 2, motor reversal control circuit 3
It is connected, the other end of the early warning indicator lamp HL1 is connected with the guard relay KA1 normally opened contact KA1.1 other end；It is described
The time relay KT1 normally-closed contact KT1.1 other end is another with guard relay KA1 reset switch REST respectively
End, the buzzer HA1 other end, control relay KA2 coil the KA2.1 other end are connected；The guard relay KA1's
It is defeated with motor reversal control circuit 3 after normally-closed contact KA1.2 other end concatenation control relay KA2 normally-closed contact KA2.2
Enter to hold B1 to be connected.
Specifically, the motor rotates forward control circuit 2 and included：Control relay KA3, control relay KA4, switch SB1,
SB2 is switched, the motor reversal control circuit 3 includes：Control relay KA5, control relay KA6, switch SB3, switch
SB4；The coil KA3.1 of control relay KA3 one end, control relay KA4 coil KA4.1 one end with it is described
The input A1 that motor rotates forward control circuit 2 is connected, and the coil KA3.1 of the control relay KA3 other end is sequentially connected in series
The input A0 of control circuit 2 is rotated forward with motor, switch SB2's after control relay KA5 normally-closed contact KA5.2, switch SB1
One end is connected, with control relay KA4 after the other end concatenation control relay KA6 of switch SB2 normally-closed contact KA6.2
Coil KA4.1 the other end be connected；The normally opened contact KA3.3 of the control relay KA3 is being serially connected in controlled motor level just
On the circuit turned, the normally opened contact KA4.3 of the control relay KA4 is serially connected on the circuit of controlled motor or so rotating forward；Institute
State control relay KA5 coil KA5.1 one end, control relay KA6 coil KA6.1 one end it is anti-with the motor
The input B1 for turning control circuit 3 is connected, the coil KA5.1 of the control relay KA5 other end be sequentially connected in series control after
The input B0 of circuit 3 is controlled with motor reversal, switch SB4 one end phase after electrical equipment KA3 normally-closed contact KA3.2, switch SB3
Even, the coil after the other end concatenation control relay KA4 of switch SB4 normally-closed contact KA4.2 with control relay KA6
The KA6.1 other end is connected；The normally opened contact KA5.3 of the control relay KA5 is serially connected in the line of controlled motor horizontal inversion
Lu Shang, the control relay KA6 normally opened contact KA6.3 are serially connected on the circuit of controlled motor or so reversion.
Further, A.C. contactor KM1, the controlled motor are provided with the circuit that the controlled motor level is rotated forward
It is provided with the circuit that left and right is rotated forward and is provided with exchange on A.C. contactor KM3, the circuit of the controlled motor horizontal inversion and connects
Tentaculum KM2：A.C. contactor KM4 is provided with the circuit of described controlled motor or so reversion；The line of the A.C. contactor KM1
Enclose KM1.1 one end one end respectively with the coil KM2.1 of the A.C. contactor KM2, A.C. contactor KM3 coil
KM3.1 one end, A.C. contactor KM4 coil KM4.1 one end, the zero line side N of alternating current 220V voltage are connected, the KM1
Coil KM1.1 the other end be sequentially connected in series A.C. contactor KM3 normally-closed contact KM3.2, control relay KA3 it is normally opened touch
It is connected after point KA3.3 with the zero line L of alternating current 220V voltage；The zero line L of the alternating current 220V voltage also respectively with control after
Electrical equipment KA5 normally opened contact KA5.3 one end, control relay KA4 normally opened contact KA4.3 one end, control relay KA6
Normally opened contact KA6.3 one end be connected；The normally opened contact KA5.3 of control relay KA5 other end concatenation exchange connects
The other end of coil KM2.1 after tentaculum KM4 normally-closed contact KM4.2 with A.C. contactor KM2 is connected；The control relay
With A.C. contactor KM3's after KA4 normally opened contact KA4.3 other end concatenation A.C. contactor KM1 normally-closed contact KM1.2
The coil KM3.1 other end is connected；The normally opened contact KA6.3 of control relay KA6 other end concatenation A.C. contactor
The other end of coil KM4.1 after KM2 normally-closed contact KM2.2 with A.C. contactor KM4 is connected.
In the present embodiment, in addition to power supply indicator HL2, the power supply indicator HL2 one end and dc source 1 it is defeated
Go out anode to be connected, the other end of the power supply indicator HL2 is connected with the output negative terminal of dc source 1, the limiter of moment
Q1 is bow formula limiter of moment.
When derrick crane hangs loads, due to the effect of load, the main chord of tower cap produces compression, and load is got over
Greatly, deformation is bigger, while the arch steel plate bent on formula limiter of moment is also deformed therewith, and the deformation of chord member is amplified, makes bow
Regulating bolt and the distance of the limit switch on bow formula limiter of moment on shape steel plate are gradually reduced with the increase of load, when
When load reaches rated load, regulating bolt touches limit switch, so as to start the Control protection system in the utility model.
The utility model is when in use：
After power switch SA1 starts, power supply indicator HL2 lamps are bright, and Control protection system enters working condition；
During derrick crane hoisting operation, cause limiter of moment Q1 to trigger when load is critical, protected after triggering
Hold electric on control relay KA1, early warning indicator lamp HL1 is lighted, motor is cut off to the danger of increase torque by KA1 normally-closed contact
The circuit control loop of dangerous direction motion；
The time set in time relay KT1, time relay KT1 does not start, and buzzer HA1 does not send acousto-optic
Alarm signal, illustrates that load is not above defined safe range, operating personnel release button SB0 by early warning and release early warning letter
Number so that this Control protection system recovers normal operating conditions；
In the time as defined in time relay KT1, time relay delay is to starting, and buzzer HA1 sends sound and light alarm
Signal, early warning indicator lamp HL1 extinguishes, and relay KA2 must be electrically activated, while cutting off motor to increase torque by the normally closed points of KA2
Dangerous direction motion circuit control loop；Now, the control action that only control load is moved to the safe direction of torque is returned
Road can be with normal work；The danger for avoiding operating personnel from being brought by maloperation；When load returns to safe torque area, torque limitation
Device Q1 dead electricity, Control protection system recovers normal operation.
The utility model is avoided because of external environment or misoperation, and caused derrick crane is rocked, limiter of moment
Triggering, the maloperation phenomenon produced, it is to avoid the machine infringement that motor frequent starting is caused, improve system stability and can
By property.
In addition, the utility model is compared with conventional AC 220V tower crane control circuits, the utility model is added
Direct current 24V power supplys improve the security of Control protection system as control circuit power.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to
Embodiment is stated, in the knowledge that those of ordinary skill in the art possess, the utility model objective can also not departed from
On the premise of various changes can be made.
Claims (5)
1. a kind of tower crane control protects system, it is characterised in that：Including dc source（1）, motor rotate forward control circuit
（2）, motor reversal control circuit（3）, power switch SA1, limiter of moment Q1, guard relay KA1, time relay KT1,
Buzzer HA1, early warning indicator lamp HL1, alarm release switch SB0 and control relay KA2；
The power switch SA1 is serially connected in dc source（1）It is described straight on circuit between external 220V alternating current input power supplyings
Flow power supply（1）Output plus terminal respectively with limiter of moment Q1 switch one end, guard relay KA1 normally opened contact KA1.1
One end, time relay KT1 normally-closed contact KT1.1 one end, alarm release switch SB0 one end, motor rotate forward control
Circuit（2）Input A0, guard relay KA1 normally-closed contact KA1.2 one end be connected, square limiter Q1 switch
One end, the time relay KT1 coil KT1.3 one end of the other end respectively with time relay KT1 normally-closed contact KT1.2
It is connected, one end of the normally-closed contact KT1.2 of the time relay KT1 other end and guard relay KA1 coil KA1.3
Be connected, the coil KA1.3 of the guard relay KA1 other end respectively with dc source（1）Output negative terminal, time relay
The device KT1 coil KT1.3 other end, early warning indicator lamp HL1 one end, the one of guard relay KA1 reset switch REST
End, buzzer HA1 one end, control relay KA2 coil KA2.1 one end, motor rotate forward control circuit（2）Input
A1, motor reversal control circuit（3）Input B0 be connected, the other end of the early warning indicator lamp HL1 and guard relay KA1
Normally opened contact KA1.1 the other end be connected；
The reset switch REST of the normally-closed contact KT1.1 of the time relay KT1 other end respectively with guard relay KA1
The other end, the buzzer HA1 other end, control relay KA2 coil KA2.1 the other end be connected；The holding relay
With motor reversal control after device KA1 normally-closed contact KA1.2 other end concatenation control relay KA2 normally-closed contact KA2.2
Circuit（3）Input B1 is connected.
2. a kind of tower crane control protection system according to claim 1, it is characterised in that：The motor rotates forward control
Circuit processed（2）Including：Control relay KA3, control relay KA4, switch SB1, switch SB2, the motor reversal control electricity
Road（3）Including：Control relay KA5, control relay KA6, switch SB3, switch SB4；
The coil KA3.1 of control relay KA3 one end, control relay KA4 coil KA4.1 one end with it is described
Motor rotates forward control circuit（2）Input A1 be connected, the coil KA3.1 of the control relay KA3 other end is gone here and there successively
After the normally-closed contact KA5.2, the switch SB1 that meet control relay KA5 control circuit is rotated forward with motor（2）Input A0, switch
SB2 one end is connected, with control relay after the other end concatenation control relay KA6 of switch SB2 normally-closed contact KA6.2
The device KA4 coil KA4.1 other end is connected；The normally opened contact KA3.3 of the control relay KA3 is serially connected in controlled motor water
On straight and even turn of circuit, the normally opened contact KA4.3 of the control relay KA4 is serially connected in the circuit of controlled motor or so rotating forward
On；
The coil KA5.1 of control relay KA5 one end, control relay KA6 coil KA6.1 one end with it is described
Motor reversal controls circuit（3）Input B1 be connected, the coil KA5.1 of the control relay KA5 other end is gone here and there successively
After the normally-closed contact KA3.2, the switch SB3 that meet control relay KA3 circuit is controlled with motor reversal（3）Input B0, switch
SB4 one end is connected, with control relay after the other end concatenation control relay KA4 of switch SB4 normally-closed contact KA4.2
The device KA6 coil KA6.1 other end is connected；The normally opened contact KA5.3 of the control relay KA5 is serially connected in controlled motor water
Redress on the circuit turned, the normally opened contact KA6.3 of the control relay KA6 is serially connected in the circuit of controlled motor or so reversion
On.
3. a kind of tower crane control protection system according to claim 2, it is characterised in that：The controlled motor water
It is provided with straight and even turn of circuit on A.C. contactor KM1, the circuit that the controlled motor or so is rotated forward and is provided with ac contactor
A.C. contactor KM2 is provided with device KM3, the circuit of the controlled motor horizontal inversion：Described controlled motor or so reversion
A.C. contactor KM4 is provided with circuit；
The coil KM1.1 of A.C. contactor KM1 one end respectively with the coil KM2.1 of the A.C. contactor KM2 one
End, A.C. contactor KM3 coil KM3.1 one end, A.C. contactor KM4 coil KM4.1 one end, alternating current 220V voltage
Zero line side N be connected, the coil KM1.1 of the KM1 other end be sequentially connected in series A.C. contactor KM3 normally-closed contact KM3.2,
It is connected after control relay KA3 normally opened contact KA3.3 with the zero line L of alternating current 220V voltage；
The zero line L of alternating current 220V voltage one end also respectively with control relay KA5 normally opened contact KA5.3, control
Relay KA4 normally opened contact KA4.3 one end, control relay KA6 normally opened contact KA6.3 one end are connected；
The normally opened contact KA5.3 of control relay KA5 other end concatenation A.C. contactor KM4 normally-closed contact KM4.2
The other end with A.C. contactor KM2 coil KM2.1 is connected afterwards；
The normally opened contact KA4.3 of control relay KA4 other end concatenation A.C. contactor KM1 normally-closed contact KM1.2
The other end with A.C. contactor KM3 coil KM3.1 is connected afterwards；
The normally opened contact KA6.3 of control relay KA6 other end concatenation A.C. contactor KM2 normally-closed contact KM2.2
The other end with A.C. contactor KM4 coil KM4.1 is connected afterwards.
4. a kind of tower crane control protection system according to claim 1, it is characterised in that：Also include power supply instruction
Lamp HL2, one end of the power supply indicator HL2 and dc source（1）Output plus terminal be connected, the power supply indicator HL2's
The other end and dc source（1）Output negative terminal be connected.
5. a kind of tower crane control protection system according to claim 1, it is characterised in that：The limiter of moment
Q1 is bow formula limiter of moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720180634.9U CN206599382U (en) | 2017-02-28 | 2017-02-28 | A kind of tower crane control protects system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720180634.9U CN206599382U (en) | 2017-02-28 | 2017-02-28 | A kind of tower crane control protects system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206599382U true CN206599382U (en) | 2017-10-31 |
Family
ID=60147818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720180634.9U Withdrawn - After Issue CN206599382U (en) | 2017-02-28 | 2017-02-28 | A kind of tower crane control protects system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206599382U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106882706A (en) * | 2017-02-28 | 2017-06-23 | 长治清华机械厂 | Tower crane control protection system |
-
2017
- 2017-02-28 CN CN201720180634.9U patent/CN206599382U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106882706A (en) * | 2017-02-28 | 2017-06-23 | 长治清华机械厂 | Tower crane control protection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206599382U (en) | A kind of tower crane control protects system | |
| CN103916069A (en) | Supercapacitor energy storing type elevator discharge control protector | |
| CN106882706B (en) | Tower crane control protects system | |
| CN104891345A (en) | Crane ground operation position limitation control apparatus | |
| CN205045575U (en) | Cloth rewinder anti -pinch device | |
| CN203384018U (en) | Air compressor energy-saving cabinet control system | |
| CN202182052U (en) | Fan control system of underground railway tunnel | |
| CN201976067U (en) | Variable frequency control device of fan | |
| CN202657854U (en) | Crane rotary brake control system | |
| CN203682951U (en) | Novel signal output stabilizing device for moment limiter of tower crane | |
| CN204696660U (en) | A kind of Motor Driven Elevating Calabash contactor adhesion protective device | |
| CN200953535Y (en) | Motor remoto-control controlling device | |
| CN203319594U (en) | Hand-shaken mechanism | |
| CN113839585B (en) | Brake control circuit, device and equipment | |
| CN206268048U (en) | Air compressor machine frequency conversion system with standby frequency converter | |
| CN202022648U (en) | Micro-programming intelligent lifting electromagnet control device | |
| CN201323546Y (en) | Electromagnetic contracting-brake rectifier controller | |
| CN109052179B (en) | Mast crane control system for installation of cement waste heat boiler | |
| CN204675718U (en) | Derrick lifting fender guard | |
| CN220273536U (en) | Novel controller for double-winding pole-changing motor | |
| CN212086090U (en) | Startup control circuit with acousto-optic early warning function | |
| CN207848548U (en) | A kind of anti-jamming control circuit of Electric Actuator | |
| CN212935806U (en) | Undisturbed switching speed regulation system | |
| CN102942118B (en) | Closed lifting mechanism anti-stall control system and method | |
| CN217486418U (en) | Frequency conversion speed reduction device of elevator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171031 Effective date of abandoning: 20180511 |
|
| AV01 | Patent right actively abandoned |