CN220078391U - Safe manual driving circuit for crane - Google Patents

Abstract

The safe manual driving circuit for the crane comprises a detection loop, an automatic driving loop and a manual driving loop which are arranged in parallel, wherein the detection loop comprises a proximity switch and a detection contactor which are correspondingly connected in series, the automatic driving loop comprises a normally open contact and a total contactor which are correspondingly connected in series, the normally open contact of the detection contactor, a normally closed stop button, a normally closed emergency stop button and the detection contactor are connected in series, the normally open contact of the total contactor is arranged outside the normally open start button in parallel, and the manual driving loop comprises a hand-operated speed reducer and a normally closed contact of the total contactor which are arranged in series; the circuit has higher safety.

Description

Safe manual driving circuit for crane

Technical Field

The utility model relates to the technical field of cranes, in particular to a safe manual driving circuit for a crane.

Background

As known, with the development of industry, more and more occasions have higher requirements on the safety and reliability of the crane; according to the dangerous grade of the hoisted object, the hoisted object can still be safely placed on the ground under the fault state of the crane, so that the crane is provided with a manual driving device, and when the crane has emergency working conditions such as power failure, electric control system fault and the like, the crane can be operated in an emergency mode through the manual driving device;

the manual driving device is generally a manual speed reducer with a worm and gear structure, when the crane operation mechanism fails, the manual speed reducer is connected, then a brake is opened, the manual driving failure mechanism is manually driven to work by operating a handle of the manual speed reducer, and for convenient operation, the manual driving device is arranged at a position nearby the crane driving device, but because in a traditional control circuit, manual driving and automatic driving are respectively and independently carried out, after the automatic driving circuit is required to be closed, the manual driving device is operated, if the automatic driving circuit is not closed, the manual driving device is erroneously touched, the crane can fail, or accidents can be caused;

therefore, in view of the above, there is a need in the market for a manual driving circuit with higher safety.

Disclosure of Invention

In order to overcome the defects in the background technology, the utility model discloses a safe manual driving circuit for a crane.

In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:

the utility model provides a safe manual drive circuit that hoist was used, contains the detection return circuit, automatic drive return circuit and the manual drive return circuit of parallelly connected setting, the detection return circuit contains the proximity switch and the detection contactor that correspond the series connection, automatic drive return circuit contains the normally open contact and the total contactor of start-up normally open button, stop normally closed button, scram normally closed button, detection contactor that correspond the series connection, and the normally open contact that is equipped with the total contactor in parallel outside the start-up normally open button, manual drive return circuit contains the normally closed contact of hand reduction gear and the total contactor of series connection setting.

Preferably, the driving hand wheel outside of hand reduction gear corresponds and is equipped with proximity switch, and is equipped with the inductive contact that can contradict with proximity switch response on the driving hand wheel.

Preferably, the proximity switch is installed in the outside of hand reduction gear through elevating system, and elevating system contains backplate, motor, installation piece, rack and gear, the face of backplate is equipped with vertical rectangular hole to and the motor, has inserted the installation piece in the rectangular hole, and the installation piece is equipped with the through-hole that is used for inserting the proximity switch, and the side of installation piece is fixed to be equipped with the rack, and the drive end of motor is equipped with the gear with the corresponding meshing of rack.

Preferably, the board face of backplate is equipped with vertical electro-magnet, and the electro-magnet can adsorb the installation piece.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

according to the safe manual driving circuit for the crane, disclosed by the utility model, the interlocking between the automatic driving circuit and the manual driving circuit can be realized by detecting the normally open contact of the contactor and the normally closed contact of the main contactor, so that only one of the manual driving circuit and the automatic driving circuit can operate at the same time, the mutual collision between the two circuits caused by mistakenly touching the manual speed reducer is avoided, and the operation safety of the crane is ensured.

Drawings

FIG. 1 is a schematic diagram of a structure of the present utility model;

fig. 2 is a schematic structural view of the lifting mechanism.

In the figure: 1. a detection loop; 101. a proximity switch; 102. detecting a contactor; 2. an automatic drive circuit; 201. starting a normally open button; 202. stopping the normally closed button; 203. a scram normally closed button; 204. a total contactor; 3. a manual drive circuit; 301. a hand-operated speed reducer; 4. a lifting mechanism; 401. a back plate; 402. a motor; 403. a mounting block; 404. a rack; 405. a gear.

Detailed Description

In the description, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., the drawings merely correspond to the drawings of the present utility model, and in order to facilitate description of the present utility model, it is not indicated or implied that the device or element referred to must have a specific azimuth:

the safe manual driving circuit for the crane comprises a detection loop 1, an automatic driving loop 2 and a manual driving loop 3 which are arranged in parallel, wherein the detection loop 1 comprises a proximity switch 101 and a detection contactor 102 which are correspondingly connected in series, the automatic driving loop 2 comprises a start normally-open button 201, a stop normally-closed button 202, an emergency stop normally-closed button 203, a normally-open contact and a total contactor 204 of the detection contactor 102 which are correspondingly connected in series, the normally-open contact of the total contactor 204 is arranged outside the start normally-open button 201 in parallel, the manual driving loop 3 comprises a hand-operated speed reducer 301 and a normally-closed contact of the total contactor 204 which are arranged in series, and the interlocking between the automatic driving loop 2 and the manual driving loop 3 can be realized through the normally-closed contact of the detection contactor 102, so that only one of the manual driving loop 3 and the automatic driving loop 2 can operate at the same time, and further, the mutual collision between the two loops caused by the wrong hand-operated speed reducer 301 is avoided, and the safety of the crane is ensured;

specifically, the outside of the driving hand wheel of the hand-operated speed reducer 301 is correspondingly provided with a proximity switch 101, and the driving hand wheel is provided with an induction contact capable of being in inductive contact with the proximity switch 101, when the proximity switch 101 correspondingly senses an inductive electric shock, the hand-operated speed reducer 301 is in a closed state, namely the proximity switch 101 is in a closed state, the detection contactor 102 is powered on, the automatic driving circuit 2 detects that the normally open contact of the contactor 102 is closed, after a start button in the automatic driving circuit 2 is pressed, the total contactor 204 is powered on, the normally open contact of the total contactor 204 is closed, the normally closed contact of the total contactor 204 in the manual driving circuit 3 is opened, namely the automatic driving circuit 2 is in a conducting state, and the manual driving circuit 3 is in an open state, and the crane is in an automatic running state; when the hand-operated speed reducer 301 acts, the proximity switch 101 is opened, the detection contactor 102 is powered off along with the power failure, the normally open contact of the detection contactor 102 in the automatic driving circuit 2 is opened, the total contactor 204 is powered off, the normally closed contact of the total contactor 204 in the manual driving circuit 3 is closed, the manual driving circuit 3 is in a conducting state, and the crane is switched to a manual running state at the moment;

in addition, proximity switch 101 passes through elevating system 4 to be installed in the outside of hand reduction gear 301, elevating system 4 contains backplate 401, motor 402, installation piece 403, rack 404 and gear 405, the face of backplate 401 is equipped with vertical rectangular hole to and motor 402, there is installation piece 403 in rectangular hole, installation piece 403 is equipped with the through-hole that is used for inserting proximity switch 101, the fixed rack 404 that is equipped with in side of installation piece 403, the drive end of motor 402 is equipped with the gear 405 that corresponds the meshing with rack 404, drive gear 405 through motor 402 and rotate, drive rack 404 reciprocates, can realize the altitude mixture control of installation piece 403, namely the altitude mixture control of proximity switch 101, thereby make proximity switch 101 can keep corresponding with the inductive contact of hand reduction gear 301, according to the needs, the face of backplate 401 is equipped with vertical electro-magnet, the electro-magnet can adsorb installation piece 403, when motor 402 works, installation piece 403 can freely go up and down at this moment, and when installation piece 403 goes up and down to the position, and motor 402 stops the electricity, adsorb its position of fixing the proximity switch 101 with installation piece 403.

The utility model has not been described in detail in the prior art, and it is apparent to those skilled in the art that the utility model is not limited to the details of the above-described exemplary embodiments, but that the utility model can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (4)

1. A safe manual driving circuit for a crane is characterized in that: contain detection circuit (1), automatic drive circuit (2) and manual drive circuit (3) of parallelly connected setting, detection circuit (1) contains proximity switch (101) and detection contactor (102) that correspond the series connection, automatic drive circuit (2) contain start normally open button (201), stop normally closed button (202), scram normally closed button (203), detect normally open contact and total contactor (204) of contactor (102) that correspond the series connection, and start normally open button (201) outer parallelly connected normally open contact that is equipped with total contactor (204), manual drive circuit (3) contain the normally closed contact of hand reduction gear (301) and total contactor (204) of series connection setting.

2. The safe manual driving circuit for a crane according to claim 1, wherein: the driving hand wheel of the hand-operated speed reducer (301) is correspondingly provided with a proximity switch (101), and the driving hand wheel is provided with an induction contact which can be in inductive interference with the proximity switch (101).

3. The safe manual driving circuit for a crane according to claim 1, wherein: the proximity switch (101) is installed in the outside of hand reduction gear (301) through elevating system (4), and elevating system (4) contain backplate (401), motor (402), installation piece (403), rack (404) and gear (405), the face of backplate (401) is equipped with vertical rectangular hole to and motor (402), has inserted installation piece (403) in rectangular hole, and installation piece (403) are equipped with the through-hole that is used for inserting proximity switch (101), and the side of installation piece (403) is fixed to be equipped with rack (404), and the drive end of motor (402) is equipped with gear (405) with rack (404) corresponding meshing.

4. A safety manual driving circuit for a crane as claimed in claim 3, wherein: the board surface of backplate (401) is equipped with vertical electro-magnet, and the electro-magnet can adsorb installation piece (403).