CN202322064U - Relay on small portal crane - Google Patents
Relay on small portal crane Download PDFInfo
- Publication number
- CN202322064U CN202322064U CN2011204111908U CN201120411190U CN202322064U CN 202322064 U CN202322064 U CN 202322064U CN 2011204111908 U CN2011204111908 U CN 2011204111908U CN 201120411190 U CN201120411190 U CN 201120411190U CN 202322064 U CN202322064 U CN 202322064U
- Authority
- CN
- China
- Prior art keywords
- relay
- plc
- intermediate relay
- portal crane
- small portal
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a relay on a small portal crane. The technical scheme is that the relay on the small portal crane comprises a programmable logic controller (PLC), a normally-opened contact on a limit switch is in series connection with a coil on an intermediate relay, and a normally-closed contact on the intermediate relay is connected to the PLC through a lead. The relay on the small portal crane has the advantages that the repetitive work of a user replacing the intermediate relay is omitted, maintenance cost is also saved, and accordingly the service life of the relay is prolonged.
Description
Technical field:
The utility model relates to the relay on a kind of hoisting crane, is specially adapted to use on the small-sized transfer crane.
Background technology:
PLC is at the very wide model of the range of use of small-sized transfer crane now; Especially under rate request pulsation-free working environment; Keep apart spacing action and PLC loop, rather than directly get into the entrance point of PLC, but this application is the normally closed contact on the used limit switch.Control an intermediate relay,, control the adhesive of forward and reverse contactless switch, the positive and negative rotation of contactor control electrical motor or stop through the programmed instruction of PLC again the entrance point that inserts PLC normal battle of intermediate relay.So just there is following shortcoming: if spacing normal, intermediate relay long-term work with regard to be in attracting state always, thus cause relay short service life, cause frequent change, make troubles to normal operation, increase maintenance cost.
Summary of the invention:
The task of the utility model is to propose a kind of intermediate relay long service life, reduces maintenance cost, a kind of small-sized transfer crane on relay.The task of the utility model is done in such a way that it comprises PLC, is characterized in that: the open contact on the limit switch is connected with the coil on the intermediate relay, and the normally closed contact on the intermediate relay inserts PLC through lead.The utlity model has following effect: not only, also saved maintenance cost, thereby prolonged the service life of relay for the user has saved the work that repeats of changing intermediate relay.
Description of drawings:
Accompanying drawing is the block scheme of the utility model.
Drawing explanation: 1, limit switch, 2, intermediate relay, 3, PLC, 4, forward and reverse contactless switch, 5, electrical motor.
The specific embodiment:
Describe embodiment in detail in conjunction with above accompanying drawing, the open contact on the limit switch 1 is connected with the coil on the intermediate relay 2, and the normally closed contact on the intermediate relay inserts PLC3 through lead, and control logic is to be accomplished by the PLC internal processes; During the limit switch normal operation, the coil in the relay must not be electric, and the normally closed point on the not adhesive intermediate relay is closed all the time, do not have abnormal signal to get among the PLC; Normal operation, the instruction that PLC exports to forward and reverse contactless switch 4 is normal, the contactless switch adhesive; Electric motor normal working, during the limit switch action, intermediate relay gets the coil adhesive of electric back; Long closed contact becomes open contact, and PLC obtains abnormal signal, sends instruction; PLC exports to forward and reverse contactless switch cut-offing instruction, the contactless switch outage, and the electrical motor 5 of contactor control shuts down; Stop limited mechanism action, get the electrician and do the time, and reached the service life that prolongs relay thereby reduced intermediate relay.
Claims (1)
1. the relay on the small-sized transfer crane, it comprises PLC, it is characterized in that: the open contact on the limit switch is connected with the coil on the intermediate relay, and the normally closed contact on the intermediate relay inserts PLC through lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204111908U CN202322064U (en) | 2011-10-18 | 2011-10-18 | Relay on small portal crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204111908U CN202322064U (en) | 2011-10-18 | 2011-10-18 | Relay on small portal crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202322064U true CN202322064U (en) | 2012-07-11 |
Family
ID=46434054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204111908U Expired - Fee Related CN202322064U (en) | 2011-10-18 | 2011-10-18 | Relay on small portal crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202322064U (en) |
-
2011
- 2011-10-18 CN CN2011204111908U patent/CN202322064U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20141018 |
|
| EXPY | Termination of patent right or utility model |