CN202072410U - Protective circuit and protective system capable of preventing lifting hook from falling - Google Patents
Protective circuit and protective system capable of preventing lifting hook from falling Download PDFInfo
- Publication number
- CN202072410U CN202072410U CN2011201603351U CN201120160335U CN202072410U CN 202072410 U CN202072410 U CN 202072410U CN 2011201603351 U CN2011201603351 U CN 2011201603351U CN 201120160335 U CN201120160335 U CN 201120160335U CN 202072410 U CN202072410 U CN 202072410U
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- relay
- circuit
- dynamo
- electric change
- switch
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Abstract
The utility model discloses a protective circuit and a protective system capable of preventing a lifting hook from falling, which comprises an electromechanical switching circuit formed by connecting an electromechanical switching switch (K1) and an electromagnetic valve (D) in series, wherein the two ends of the electromechanical switching circuit are a voltage input terminal and a grounding terminal, which are used for being respectively connected with a direct current power supply; the two ends of the electromechanical switching circuit are connected with a control circuit in parallel; the control circuit comprises a rising switch (K2), a restoring switch (K3), a relay (M) and a normally open contact of the relay (M); the restoring switch is connected with the normally open contact of the relay (M) in series and then is connected with the rising switch in parallel; a parallel circuit is connected with the relay (M) in series so that the control circuit is formed; the electromechanical switching circuit further comprises a normally closed contact of the relay (M); and the normally closed contact of the relay (M) is connected with the electromechanical switching switch (K1) and the electromagnetic valve (D) in series. The safety of the lifting hook is kept through the protective circuit capable of preventing the lifting hook from falling and the protective circuit capable of preventing the lifting hook from falling is more convenient and practical.
Description
Technical field
The utility model relates to a kind of crane circuit, specifically, relates to a kind of protective circuit of preventing that suspension hook from falling of being used to.
Background technology
Electronmotive Force crane off the hook braking has electric brake and two kinds of brake modes of foot brake.Electric brake is to use automatically controlled brake to brake when suspension hook falls, and this kind brake mode moment is big, the brake efficiency height, and the driver does not need to step on brake pedal, but the suspension hook descending speed is slow, and inefficiency is suitable for heavy load; Foot brake is that the suspension hook mechanical type brake that tramps with one's feet when falling is braked, and this kind brake mode moment is little, and brake efficiency is low, and the driver need firmly step on brake pedal, but suspension hook is can descending speed fast, and high efficiency is suitable for underload.Referring to shown in Figure 1, be two kinds of brake modes change-over circuit figure, the dynamo-electric change-over swith K1 of main at present use changes, and is used for the break-make of control electromagnetic valve D, and electromagnetic valve D energized is the foot brake state, and electromagnetic valve D power cut-off is the electric brake state.In actual use, use electric brake during the crane heavy duty, use foot brake during the crane underloading, want frequent transitions electric mechanical switch K1 like this, may cause the driver to forget dynamo-electric change-over swith K1 present position (electric brake or foot brake).If when K switch 1 is in foot brake; the driver takes for and is in electric brake, hoisting when stopping, not touching on the brake; goods and suspension hook will fall fast like this; Deng finding to step on foot brake again, late, there is potential safety hazard; and because safety misadventure took place in this reason; therefore how researching and developing a kind of suspension hook fall arrest protective circuit, ensure hoist lifting hook safety, is the problem that the present invention mainly solves.
Summary of the invention
The utility model provides a kind of suspension hook fall arrest protective circuit in order to solve the existing low problem of crane off the hook brake power conversion circuit safety performance, and is safe and reliable.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of suspension hook fall arrest protective circuit; comprise the dynamo-electric change-over circuit that is in series and forms by dynamo-electric change-over swith (K1) and electromagnetic valve (D); the two ends of described dynamo-electric change-over circuit are respectively voltage input end and the earth terminal that is used to connect direct supply; be parallel with control circuit at described dynamo-electric change-over circuit two ends; described control circuit comprises rising switch (K2); reset switch (K3); relay (M); the open contact of relay (M); described reset switch is connected with the open contact of relay (M) afterwards and the rising switch in parallel; this circuit parallel and relay (M) are in series and form control circuit; described dynamo-electric change-over circuit also comprises the normally closed contact of relay (M), and the normally closed contact of described relay (M) and dynamo-electric change-over swith (K1) and electromagnetic valve (D) are in series.
Suspension hook fall arrest protective circuit of the present utility model; control circuit is set; in suspension hook hoists process by with rising switch (K2) closure; relay (M) conducting; the normally closed contact of the then open contact adhesive of relay (M), relay (M) disconnects; thereby dynamo-electric change-over circuit is in the electric brake state; have only reset switch is disconnected; relay (M) disconnects; the normally closed contact adhesive of the then open contact of relay (M) disconnection, relay (M); and satisfying dynamo-electric change-over swith (K1) simultaneously when closed, dynamo-electric change-over circuit just can be in the foot brake state.Can prevent effectively that suspension hook from falling, and ensured safety.
Based on above-mentioned suspension hook fall arrest protective circuit; the utility model provides a kind of suspension hook fall arrest protection system simultaneously; comprise the dynamo-electric change-over circuit that is in series and forms by dynamo-electric change-over swith (K1) and electromagnetic valve (D); handle hoists; with the service brake pedal; be parallel with control circuit at described dynamo-electric change-over circuit two ends; described control circuit comprises conducting state be subjected to the hoisting rising switch (K2) of handle control; reset switch (K3); relay (M); the open contact of relay (M); described reset switch is connected with the open contact of relay (M) afterwards and the rising switch in parallel; this circuit parallel and relay (M) are in series and form control circuit; described dynamo-electric change-over circuit also comprises the normally closed contact of relay (M), and the normally closed contact of described relay (M) and dynamo-electric change-over swith (K1) and electromagnetic valve (D) are in series.
Further, described reset switch (K3) is subjected to service brake foot-controlled reset switch for conducting state.
Compared with prior art; advantage of the present utility model and good effect are: suspension hook fall arrest protective circuit of the present utility model is by being provided with control circuit; make the just conducting under the closed simultaneously situation of dynamo-electric change-over swith and relay normally closed contact of dynamo-electric change-over circuit; promptly be in the foot brake state; when any one condition does not meet; dynamo-electric change-over circuit disconnects; promptly be in the electric brake state; ensured suspension hook safety; help navigating mate and clearly know the foot brake state; and suspension hook fall arrest protection system of the present utility model is by the hoist conducting state of handle control rising switch of utilization; utilize the conducting state of service brake pedal control reset switch; need not navigating mate M/C rising switch and reset switch, convenient; practical.
After reading the detailed description of the utility model embodiment in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is existing dynamo-electric change-over circuit;
Fig. 2 is a kind of embodiment circuit diagram of suspension hook fall arrest protective circuit that the utility model proposes.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is done explanation in further detail.
The utility model is controlled for the state that solves dynamo-electric change-over circuit only is subjected to dynamo-electric change-over swith; do not add the problem of any circuit; a kind of suspension hook fall arrest protective circuit is provided; by the control circuit that is in parallel with dynamo-electric change-over circuit is set, and in dynamo-electric change-over circuit the normally closed contact of series connection one relay, thereby reach the purpose that control circuit can the controlling machine power conversion circuit; circuit structure is simple; be easy to realize, and safe and reliable, ensured that effectively suspension hook prevents to fall.Be example with suspension hook fall arrest protection system below, describe the principle of work of this protective circuit in detail with suspension hook fall arrest protective circuit.
Embodiment one; referring to shown in Figure 2; be suspension hook fall arrest protective circuit schematic diagram in the present embodiment; comprise dynamo-electric change-over circuit; described dynamo-electric change-over circuit is in series by dynamo-electric change-over swith K1 and electromagnetic valve D and forms; the two ends of described dynamo-electric change-over circuit are respectively voltage input end and the earth terminal that is used to connect direct supply (such as+24V direct supply); be parallel with control circuit at described dynamo-electric change-over circuit two ends; described control circuit comprises rising K switch 2; reset switch K3; relay M; the open contact M-2 of relay M; it is in parallel after described reset switch is connected with the open contact M-2 of relay M with rising K switch 2; this circuit parallel and the relay M composition control circuit that is in series; described dynamo-electric change-over circuit also comprises the normally closed contact M-1 of relay M, and the normally closed contact M-1 of described relay M and dynamo-electric change-over swith K1 and electromagnetic valve D are in series.Described reset switch K3 is normally closed reset switch.
The principle of work of this suspension hook fall arrest protective circuit is: in suspension hook hoists process by with rising K switch 2 closures; thereby relay M conducting; the conducting of relay M is the open contact M-2 adhesive of control relay M then; the normally closed contact M-1 of relay M disconnects; therefore; dynamo-electric change-over circuit is in the electric brake state; have only reset switch is disconnected; thereby relay M disconnects; relay M disconnects then, and the open contact M-2 of control relay M disconnects; the normally closed contact M-1 adhesive of relay M; and satisfying dynamo-electric change-over swith K1 simultaneously when closed, dynamo-electric change-over circuit just can be in the foot brake state.Make dynamo-electric change-over circuit under more situation, be in the electric brake state, and when being in the foot brake state, the more clearly foot brake state that when is in of navigating mate can prevent effectively that suspension hook from falling, and ensured safety.
Suspension hook fall arrest protection system of the present utility model is by the conducting state that rising K switch 2 in the control circuit is set be subjected to hoisting handle control; when the handle control suspension hook that hoists hoists; control 2 conductings of rising K switch simultaneously; the then conducting of relay M; the open contact M-2 adhesive of relay M; the normally closed contact M-1 of relay M disconnects; therefore; dynamo-electric change-over circuit is in the electric brake state; when the handle that hoists stops to hoist suspension hook; the rising switch disconnects; and still open contact M-2 adhesive and the normally closed reset switch K3 conducting by relay M of relay M this moment; therefore; have only this moment and satisfy reset switch K3 disconnection and dynamo-electric change-over swith K1 closure simultaneously; could make and dynamo-electric change-over circuit conducting promptly enter the foot brake state.
In order to save the judgement time of navigating mate more, described reset switch K3 preferably adopts conducting state to be subjected to service brake foot-controlled reset switch, that is: by being provided with when chaufeur is stepped on the service brake pedal, reset switch is disconnected, the normally closed contact M-1 closure of relay M then, chaufeur enters the service brake state with dynamo-electric change-over swith closure then, and this moment, chaufeur was stepped on the service brake pedal really, prevented that effectively suspension hook from falling; If this moment, chaufeur was forgotten closed dynamo-electric change-over swith, then foot brake is invalid, and dynamo-electric change-over circuit still is in the electric brake state, has prevented that also suspension hook from falling.Therefore, which kind of state no matter, suspension hook fall arrest protection system of the present utility model all can be protected suspension hook safety.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.
Claims (3)
1. suspension hook fall arrest protective circuit; comprise the dynamo-electric change-over circuit that is in series and forms by dynamo-electric change-over swith (K1) and electromagnetic valve (D); it is characterized in that: the two ends of described dynamo-electric change-over circuit are respectively voltage input end and the earth terminal that is used to connect direct supply; be parallel with control circuit at dynamo-electric change-over circuit two ends; described control circuit comprises rising switch (K2); reset switch (K3); relay (M); the open contact of relay (M); described reset switch is connected with the open contact of relay (M) afterwards and the rising switch in parallel; this circuit parallel and relay (M) are in series and form control circuit; described dynamo-electric change-over circuit also comprises the normally closed contact of relay (M), and the normally closed contact of described relay (M) and dynamo-electric change-over swith (K1) and electromagnetic valve (D) are in series.
2. suspension hook fall arrest protection system; comprise the dynamo-electric change-over circuit that is in series and forms by dynamo-electric change-over swith (K1) and electromagnetic valve (D); handle hoists; with the service brake pedal; it is characterized in that: be parallel with control circuit at described dynamo-electric change-over circuit two ends; described control circuit comprises conducting state be subjected to the hoisting rising switch (K2) of handle control; reset switch (K3); relay (M); the open contact of relay (M); described reset switch is connected with the open contact of relay (M) afterwards and the rising switch in parallel; this circuit parallel and relay (M) are in series and form control circuit; described dynamo-electric change-over circuit also comprises the normally closed contact of relay (M), and the normally closed contact of described relay (M) and dynamo-electric change-over swith (K1) and electromagnetic valve (D) are in series.
3. suspension hook fall arrest protection system according to claim 2 is characterized in that: described reset switch (K3) is subjected to service brake foot-controlled reset switch for conducting state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201603351U CN202072410U (en) | 2011-05-19 | 2011-05-19 | Protective circuit and protective system capable of preventing lifting hook from falling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201603351U CN202072410U (en) | 2011-05-19 | 2011-05-19 | Protective circuit and protective system capable of preventing lifting hook from falling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202072410U true CN202072410U (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201603351U Expired - Fee Related CN202072410U (en) | 2011-05-19 | 2011-05-19 | Protective circuit and protective system capable of preventing lifting hook from falling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202072410U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942117A (en) * | 2012-11-20 | 2013-02-27 | 抚顺起重机制造有限责任公司 | Handle inhibition protection system for condition with lowering of empty hook of crane |
-
2011
- 2011-05-19 CN CN2011201603351U patent/CN202072410U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102942117A (en) * | 2012-11-20 | 2013-02-27 | 抚顺起重机制造有限责任公司 | Handle inhibition protection system for condition with lowering of empty hook of crane |
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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: 20111214 Termination date: 20120519 |