CN201756428U - Heavy hammer limiting device - Google Patents
Heavy hammer limiting device Download PDFInfo
- Publication number
- CN201756428U CN201756428U CN2010202858654U CN201020285865U CN201756428U CN 201756428 U CN201756428 U CN 201756428U CN 2010202858654 U CN2010202858654 U CN 2010202858654U CN 201020285865 U CN201020285865 U CN 201020285865U CN 201756428 U CN201756428 U CN 201756428U
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- China
- Prior art keywords
- weight
- limit switch
- pull bar
- heavy hammer
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- Expired - Fee Related
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Abstract
The utility model discloses a heavy hammer limiting device, which comprises two heavy hammer type limit switches and two corresponding heavy hammers; the heavy hammer type limit switches comprise housings and drawbars, wherein the drawbars are equipped with return springs; a group of normally-opened contacts are correspondingly respectively arranged on the drawbars; the two heavy hammers are vertically arranged on a wire rope of an electric chain block; one end of each drawbar extends out of the housings and is respectively connected with the corresponding heavy hammer through a tension rope; and a normally-opened contact of the heavy hammer type limit switch with the heavy hammer arranged at the lower part is serially connected to a hoisting contactor control loop, and a normally-opened contact of the heavy hammer type limit switch with the heavy hammer arranged at the upper part is serially connected to a main contactor control loop. The utility model inherits the advantages of the traditional heavy hammer type limit switch, and has the advantages of simple structure, reliable performance, simple control circuit and convenience of installation and maintenance, and the safety and the reliability of the electric chain block are greatly improved.
Description
Technical field
The utility model relates to elevator machinery, especially the upper limit device of lifting electric block.
Background technology
Electric block upper limit device commonly used divides two kinds at present: a kind of is the cutoff limit switch, and another kind is the weight limit switch.
The cutoff limit switch can directly cut off two mutual-assistance motor stalls in the motor three-phase power.Be widely used at present, but defective such as it exists that transmission link is many, fault rate is high, return stroke is long, spacing inaccurate, wiring complexity.
Thereby the weight limit switch cuts off motor power by the control power supply that cuts off contactless for hoisting and makes the motor stall.Though simple in structure, not widespread use at present easy for installation, contactless for hoisting main contact adhesion weight limit switch disconnection contactless for hoisting control power supply still can't make the motor stall even major cause is.
Summary of the invention
Even the purpose of this utility model is exactly to provide a kind of contactless for hoisting adhesion still can make the motor stall by failure-free at the defective of above-mentioned prior art, prevent the generation weight inhibiting device of accidents such as rushing to summit.
Its technical scheme is as follows:
The weight inhibiting device comprises two weight limit switches and corresponding two weights; Above-mentioned weight limit switch comprises housing and pull bar, and pull bar disposes retracing spring, and corresponding above-mentioned pull bar respectively is provided with one group of open contact; Above-mentioned two weights are upper and lower to be arranged on the steel rope of electric block; One end of pull bar stretches out housing and connects corresponding weight by tension rope; Wherein weight under the open contact of weight limit switch seal in the contactless for hoisting control loop, weight seals in total contactor control loop at the open contact of last weight limit switch.
The utility model can have following working process in use: initial in the electric block lifting, the tension rope of weight is tension, open contact closure in the limit switch, along with driving weight, electric block gib head rising steel rope rises, when gib head rises to spacing position, make earlier the position under weight and the tension rope between pull bar become relaxed state, pull bar resets under the effect of retracing spring, the open contact separation that resets, control electric block contactless for hoisting outage stopping lifting; If this position under the weight limit switch damage, control path fault or the adhesion of contactless for hoisting main contact can't disconnect motor power then motor continues to rise and drives the position and rise at last weight, make it tension rope and become relaxed state, open contact in the corresponding limit switch is disconnected, the total contactless switch outage stopping of control electric block lifting prevents that damage equipment from causing safety misadventure.
As seen from the above, above-mentioned two weight limit switches, wherein weight under one as the rising limit switch, the weight position is in the unexpected protection of last conduct.Because electric current is big during electric motor starting, frequent load-carrying lifting during electric block work, so contactless for hoisting main contact adhesion fault is higher, and the only adhesive when bringing into use of total contactless switch, use to finish the back and disconnect, so and all be that to carry out the main contact adhesion fault when zero load extremely low.The simultaneously total contactless switch main contact of the contactless for hoisting main contact adhesion also probability of adhesion is littler, because so the independent fully probability that damages simultaneously of employed two weight limit switches is also very low, so this kind control method reliability is high, the spacing alarm function improves processing safety greatly simultaneously.The beneficial effects of the utility model are, the advantage that the utility model has been inherited existing weight limit switch has improved the safety of electric block and reliability, simple in structure, dependable performance again greatly, control path is simple, installation and maintenance are convenient.
As improvement of the present utility model, the pull bar of corresponding above-mentioned limit switch also can be provided with one group of normally closed contact, and above-mentioned normally closed contact seals in the alarm control loop.Can realize warning function like this, alarm loop can connect acoustic-optic alarms such as electric bell, alarm lamp.
Further improve as of the present utility model, above-mentioned every group of contact comprises at least two pairs of contacts.Can be used for the single speed electric block, also can be used for double speed single speed electric block.
Below in conjunction with figure and embodiment the utility model is further specified.
Description of drawings
Fig. 1: the mounting structure scheme drawing of the utility model on the electric block of no fixed pulley;
Fig. 2: the utility model is at the mounting structure scheme drawing that has on the electric block of fixed pulley;
Fig. 3: weight limit switch structural representation;
Fig. 4: electrical schematic diagram when the single speed electric block uses;
Fig. 5: electrical schematic diagram when two-speed electric block uses.
1. weight limit switch I, 2. weight limit switch II, 3. bases among the figure, 4. tension rope, 5. tension rope, 6. weight I, 7. weight II, 11. normally closed contacts, 12. normally closed contacts, 13. open contact, 14. open contacts, 15. retracing springs, 16. recoil spring, 17. hang the thing draw ring, 18. housings, 19. pull bars.
The specific embodiment
As shown in Figure 3, weight limit switch of the present utility model comprises housing 18, vertically be provided with pull bar 19 in the housing 18, housing 18 is stretched out in the lower end of pull bar 19, above-mentioned pull bar 19 also is furnished with retracing spring 15, corresponding pull bar 19 is respectively arranged with one group of open contact and one group of normally closed contact, and above-mentioned open contact comprises 13,14 two pairs of contacts, and above-mentioned normally closed contact comprises 11,12 two pairs of contacts.
Embodiment one: the utility model is used (referring to Fig. 1 and Fig. 4) in the single speed electric block
Be fixed on place, steel rope wedging hole base plate 3 is installed, weight 6 and 7 be sleeved on the steel rope of wedging end, two weights are installed up and down, and weight 6 is following, and weight 7 is last, and tension rope 4 two ends are fixedly connected on weight 6 respectively and weight limit switch 1 is hung the thing end.Tension rope 5 two ends are fixedly connected on weight 7 respectively and weight limit switch 2 is hung the thing end.Regulate spacing height by the length of adjusting tension rope 6, regulate the height of unexpected protection by the length of adjusting tension rope 7.The contact of weight limit switch 1 is inserted in the electric block control loop, and 13 and 14 1 seal in the contactless for hoisting control loop, and another is standby.11 and 12 1 serial connection electric bells are as spacing alarm, and another is standby.13 and 14 1 seal in total contactor control loop in the contact access electric block control loop of weight limit switch 2, and another is standby, and 11 and 12 1 serial connection electric bells are as spacing alarm, and another is standby.During normal the use, because the tension of weight makes the open contact closure, normally closed contact disconnects, each mechanism's normal operation.When rising to spacing position, gib head drives weight 6 risings, make tension rope 4 become relaxed state, the weightless open contact 13 and 14 of 1 weight limit switch resets and disconnects contactless for hoisting control power supply and make the stall of motor dead electricity, simultaneously the normally closed contact 11 and 12 closed electric bell power supply of connecting that resets is done spacing alarm, and operating personal stops to rise after hearing warning.Can't disconnect motor power as the damage of 1 weight limit switch, the adhesion of contactless for hoisting main contact or control path fault etc., then motor continues 7 risings of rising drive weight, make tension rope 5 become relaxed state, the weightless open contact 13 and 14 of 2 weight limit switches resets and disconnects main contactor control power supply and make the stall of motor dead electricity, and the normally closed contact 11 and 12 closed electric bell power supply of connecting that resets is done spacing alarm simultaneously.Thereby failure-free is realized the control to the upper limit of electric block.
Embodiment two: use in the two-speed electric block (referring to Fig. 2 and Fig. 5)
Be fixed on steel rope fixed pulley place base plate 3 is installed, weight 6 and 7 be sleeved on the steel rope of wedging end, two weights are installed up and down, and weight 6 is following, and weight 7 is last, and tension rope 4 two ends are fixedly connected on weight 6 respectively and weight limit switch 1 is hung the thing end.Tension rope 5 two ends are fixedly connected on weight 7 respectively and weight limit switch 2 is hung the thing end.Regulate spacing height by the length of adjusting tension rope 4, regulate the height of unexpected protection by the length of adjusting tension rope 5.The contact of weight limit switch 1 is inserted in the electric block control loop, and 13 and 14 1 seal in fast rise contactor control loop, and another seals in contactless for hoisting control loop at a slow speed, and 11 and 12 1 serial connection electric bells are as spacing alarm, and another is standby.13 and 14 1 seal in total contactor control loop in the contact access electric block control loop of weight limit switch 2, and another is standby, and 11 and 12 1 serial connection electric bells are as spacing alarm, and another is standby.During normal the use, because the tension of weight makes the open contact closure, normally closed contact disconnects, each mechanism's normal operation.When rising to spacing position, gib head drives weight 6 risings, make tension rope 4 become relaxed state, the weightless open contact 13 and 14 of 1 weight limit switch resets and disconnects contactless for hoisting control power supply and make the stall of motor dead electricity, simultaneously the normally closed contact 11 and 12 closed electric bell power supply of connecting that resets is done spacing alarm, and operating personal stops to rise after hearing warning.Can't disconnect motor power as the damage of 1 weight limit switch, the adhesion of contactless for hoisting main contact or control path fault etc., then motor continues 7 risings of rising drive weight, make tension rope 5 become relaxed state, the weightless open contact 13 and 14 of 2 weight limit switches resets and disconnects main contactor control power supply and make the stall of motor dead electricity, and the normally closed contact 11 and 12 closed electric bell power supply of connecting that resets is done spacing alarm simultaneously.Thereby failure-free is realized the control to the upper limit of electric block.
Should be understood that; enforcement of the present utility model is not limited in above embodiment; as the form of limit switch and fixed form etc.; can also make some improvements and modifications for those skilled in the art under the prerequisite that does not break away from this patent principle, these improvements and modifications also should be the protection domain of this patent.
Claims (5)
1. the weight inhibiting device is characterized in that affiliated weight inhibiting device comprises two weight limit switches and corresponding two weights; Above-mentioned weight limit switch comprises housing and pull bar, and pull bar disposes retracing spring, and corresponding above-mentioned pull bar respectively is provided with one group of open contact; Above-mentioned two weights are upper and lower to be arranged on the steel rope of electric block; One end of pull bar stretches out housing and connects corresponding weight by tension rope; Wherein weight under the open contact of weight limit switch seal in the contactless for hoisting control loop, weight seals in total contactor control loop at the open contact of last weight limit switch.
2. weight inhibiting device according to claim 1 is characterized in that: the pull bar of corresponding above-mentioned limit switch also is provided with one group of normally closed contact, and described normally closed contact seals in the alarm control loop.
3. weight inhibiting device according to claim 1 and 2 is characterized in that: above-mentioned every group of contact comprises at least two pairs of contacts.
4. weight limit switch, it is characterized in that: described weight limit switch comprises housing and pull bar, and pull bar disposes retracing spring, corresponding above-mentioned pull bar is provided with one group of open contact; One end of pull bar stretches out housing and is connected with weight by tension rope.
5. weight limit switch according to claim 4 is characterized in that: the pull bar of corresponding above-mentioned limit switch also is provided with one group of normally closed contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202858654U CN201756428U (en) | 2010-08-06 | 2010-08-06 | Heavy hammer limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202858654U CN201756428U (en) | 2010-08-06 | 2010-08-06 | Heavy hammer limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201756428U true CN201756428U (en) | 2011-03-09 |
Family
ID=43643697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202858654U Expired - Fee Related CN201756428U (en) | 2010-08-06 | 2010-08-06 | Heavy hammer limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201756428U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106081921A (en) * | 2016-08-10 | 2016-11-09 | 河南新科起重机股份有限公司 | The double stopping means of a kind of fork type flexible weight |
-
2010
- 2010-08-06 CN CN2010202858654U patent/CN201756428U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106081921A (en) * | 2016-08-10 | 2016-11-09 | 河南新科起重机股份有限公司 | The double stopping means of a kind of fork type flexible weight |
| CN106081921B (en) * | 2016-08-10 | 2018-05-29 | 河南新科起重机股份有限公司 | A kind of double limiting devices of fork type flexible weight |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110309 Termination date: 20130806 |