CN2181495Y

CN2181495Y - Hoist with lift controlling circuit

Info

Publication number: CN2181495Y
Application number: CN 93219686
Authority: CN
Inventors: 钟宗勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-30
Filing date: 1993-07-30
Publication date: 1994-11-02
Anticipated expiration: 2003-07-30

Abstract

The utility model relates to a hoist with a rise control circuit and a fall control circuit. Junctions of two relays are used for causing a motor winding of the hoist to form a delta or Y wire connection form. The utility model uses a positive and a reverse rotation relays to control the transformation of the wire connection form of the two relays through a timing relay so that the rise and fall actions of the hoist tend to smooth.

Description

Hoist with lift controlling circuit

The utility model is the winch that relates to a kind of tool ascending, descending control circuit, be that contact by two relays makes winch motor winding constitute △ or Y connection type respectively, control the connection type conversion of aforementioned two relays with two forward and backward relays by a timing relay again, so that make the ascending, descending action of winch more become steady.

Existing winch control path is striden the actuating of relay contact 910,920 of establishing two groups of tool mechanical chain effects respectively as shown in Figure 2 between winch motor 90 input ends and power supply R, S, motor 90 input two ends are the electric capacity 95 of cross-over connection parallel connection again; The S of power supply, R then cross-over connection have the field winding 91,92 of above-mentioned action connection point 910,920, this field winding 91,92 is respectively by a

button

93,94 its break-makes of control, selection by two

buttons

93,94 is pushed, connect the power supply of motor 90 respectively through action connection point 910,920, to control its rotating.

Though this control path can normally be controlled 90 liters in motor, action is fallen promptly just, counter-rotating, but it is still not ideal enough on utility function, winch is used for the cargo handing between high building and ground more, no matter lifting all may be carried suitable weight during operation, suspend in midair under the suitable weight situation at it, and motor 90 when starting as not providing between a phase buffer, promptly with identical speed lifting or decline, then at its liter, when falling beginning, the goods of suspention promptly may wave, as winch is with the hanging basket bearing goods, may be because of waving the phenomenon ground of falling, for cargo handing and safety all generation have a strong impact on.So existing winch control circuit has necessity of improvement.

Main purpose of the present utility model is: a kind of winch that forms the control circuit between the low speed phase buffer when ascending, descending begins that has is provided, be to make winch motor winding do △-Y connection type conversion by two relay tips, continue-the connection type conversion of device by two wiring of electrotimer control with the forward and backward relay again, make winch ascending, descending action more become steady.

The utility model is a kind of winch of tool ascending, descending control circuit, and its advantage is: winch with low-speed running, after finishing at the fixed time, recovers the general speed running in initial start stage again, so that make its ascending, descending action more become steady.

The utility model is a kind of winch of tool ascending, descending control circuit, be to be connected on three groups of normal opened contacts of a △ relay at motor X, Y, Z end, not only motor U, V, W and power supply RST mutually between power supply but also cross-over connection the normal opened contact of one power supply relay is arranged, motor U, V, W go up to Z, X, Y with the normal opened contact cross-over connection of a Y relay respectively mutually mutually again, it is characterized in that:

Distinguish the normal opened contact of cross-over connection forward and backward relay between the normal opened contact of this △, Y relay and power supply again; Above-mentioned each relay then is connected on the control path, this control path is to go up rising, the decline button that connects a mechanical chain through a manual stop button respectively mutually at power supply R, this rising, decline button are after lease making instead, is just changeing a normally closed contact of relay again, field winding with the forward and backward relay is connected again, and wherein this rising, decline button cross-over connection again have the forward and backward relay;

Power supply R is connected with a timing relay through two forward and backward relay normally open contacts connected with each other again mutually, often the opening of this electrotimer, the normally closed contact that normally closed contact lease making two is respectively △ relay, power supply relay are connected with the coil-end of power supply relay and △ relay, and wherein the coil of this power supply relay is again with the Y relay and connect;

Foregoing circuit can turn round in low-tach Y connection mode earlier when the lifting of winch motor starts, and behind appropriate time, is converted to the △ shape mode of connection running of higher speed again, makes the landing of winch more become steady with this mode.

The winch of aforesaid tool lifting control circuit is characterized in that: the rising of this control path, decline button have a normal opened contact of forward and backward relay through a manual switch cross-over connection, as the purposes that keeps.

Further specify architectural feature of the present utility model and purpose below in conjunction with accompanying drawing.

Brief Description Of Drawings:

Fig. 1 is control path figure of the present utility model.

Fig. 2 is the control path figure of existing winch.

Relevant control path of the present utility model, as shown in Figure 1, be on the three-phase motor 10 of small winch, to pull out six groups of winding line end U, V, W, X, Y, Z, wherein at the U of motor 10, V, be connected with three groups of normal opened contact groups 21 of a △ relay 20 on the W end, when this normal opened contact group 21 is connected, the RST power supply gives direct supply and has the motor 10 inner windings that delta connection forms of one's own, the U of motor 10 again, V, the normal opened contact group 61 of other cross-over connection one Y relay 60 on the W end, when this normal opened contact group 61 is connected, U, V, the W end interconnects, winding constitutes the Y connection form in the motor 10 and make, the X of motor 10, Y, the Z end is through the normal opened contact group 31 of a power supply relay 30, again just through two, counter-rotating relay 40,50 normal opened contact 41,51 are connected on the RST phase power supply of power supply, so that this just, counter-rotating relay 40, the rotating of 50 control motors 10.

The R of motor 10 power ends, S, T is provided with overload circuit 11, power supply R wherein, T then is connected on the control path 70 mutually, this control path 70 is to go up the rising that connects a mechanical chain through a stop button 71 respectively mutually at power supply R, decline button 72,73 just, counter-rotating, this rising, decline button 72,73 lease making is anti-again, just changeing relay 50, a normally closed contact 52 of 40,42, with its just, counter-rotating relay 40,50 field winding connects, wherein should rise, decline button 72,73 just have through manual switch 74 cross-over connections again, counter-rotating relay 40, a normal opened contact 43 of 50,53, as the purposes that keeps;

Power supply R is connected with a timer 80 by two normal opened contacts 44,54 in parallel of forward and backward relay 40,50 mutually, the timing of this timer 80 often opens, regularly normally closed contact 81,82 is connected with the field winding of power supply relay 30 and △ relay 20 through two normally closed contacts 22,32 of △ relay 20 and power supply relay 30 respectively, and wherein power supply relay 30 is connected in parallel with the field winding of this Y relay 60 again;

Rising, the decline button 72,73 on the aforementioned control path 70 pushed in selection, makes motor 10 constitute a Y connection form in initial start stage through electrotimer 80, and provides between a low speed phase buffer, and the lifting process that makes winch is steady and smooth more.

Because the phase voltage of motor 10 windings when △ shape connection type equals line voltage, and for example when the Y connection form, phase voltage then is 1.73 times of line voltage, so the line voltage that is born during the Y connection form is about 57 % of △ shape connection type, so when △ shape connection type, it is bigger that motor 10 bears phase voltage, rotating speed is higher, on the contrary, when the Y connection form, because that motor 10 bears phase voltage is little, its rotating speed is also low, the utility model adopts the lower Y connection form of rotating speed in the winch initial start stage, then is transformed into the higher △ shape connection type of rotating speed after after a while, and winch can carry out lifting under plateau; The course of action of above-mentioned control loop 70 is detailed as described below:

When hand switch 74 is connected, want winch to start when rising, promptly press positive pressure and change button 72, this moment, R phase power supply made through the normally closed contact 52 of counter-rotating relay that just to change relay 40 excitatory, its another normal opened contact 44 closures of going up mutually at power supply R, make the timing of timer 80 often open, normally closed contact 81,82 exchange, and pick up counting, this moment power supply also the timing normal opened contact 81 after its closure make Y relay 60 simultaneously excitatory with power supply relay 30, make its normal opened contact group 61 on motor 10 windings, 31 closures, motor 10 is promptly with the low rate start of Y connection form, winch is steadily risen, by the time after timer 80 timing finished, it was regularly often opened, normally closed contact 81,82 restore to the original state, excitatory even recover the timing normally closed contact 82 △ relays 20 of closure this moment, and power supply relay 30 and 60 outages of Y relay, thereby its normal opened contact group 21 closures on motor 10 windings, and two normal opened contact groups 31 in addition, 61 cut-outs are so that make the △ form running of its conversion with higher speed; When descending as for it, then push invert button 73, will be by timer 80 controls, also be by connecting the normal opened contact 54 of counter-rotating relay 50, and the control circuit that makes the figure right side of face repeats aforementioned activities, make motor 10 windings earlier with Y form low rate start, convert the higher speed continuous running of △ form again to, and when descending, obtain identical stablizing effect.

Produced when hand switch 74 is connected with above-mentioned operating state, cause is just changeed, invert button 72,73 all will be kept by 43,53 of the normal opened contacts of forward and backward relay 40,50 after action, lifting terminal point by winch is controlled other by limit switch, when implementing the lifting of certain height not, then can make this hand switch 74 be open circuit as desire; When desiring to make winch to be up and down at a predetermined height, promptly continue to push this and just changeing button 72 or invert button 73, after being up and down at a predetermined height, loose one's grip just now, can be according to the not lifting control of certain height of required do, thought still with above-mentioned Y-△ formal transformation, is controlled the forward and backward of motor 10 between buck stay.

With above-mentioned mode when the winch ascending, descending starts with than slow speed of revolution running, after the schedule time, change the fair speed running again, and lifting process more become steadily, and can thoroughly get rid of and jeopardize safe accident generation.

Claims

1, a kind of winch of tool ascending, descending control circuit, be three groups of normal opened contacts that on motor U, V, W end, are connected with a Δ relay, its the two be connected with a Y relay again, again motor X, Y, Z and power supply RST mutually between power supply again cross-over connection the normal opened contact of one power supply relay is arranged, it is characterized in that:

Distinguish the normal opened contact of cross-over connection forward and backward relay between the normal opened contact of this Δ, Y relay and power supply again, above-mentioned again each relay then is connected on the control path; This control path be power supply R go up mutually connect respectively through a manual stop button one rise, the decline button, this rising, decline button are after lease making instead, is just changeing a normally closed contact of relay again, the field winding with the forward and backward relay is connected again;

Power supply R is connected with a timing relay through two forward and backward relay normally open contacts connected with each other again mutually, often the opening of this electrotimer, normally closed contact are connected with the coil-end of power supply relay and Δ relay through the normally closed contact of Δ relay, power supply relay respectively, and wherein the coil of this power supply relay is connected in parallel with the Y relay again;

When foregoing circuit starts in the ascending, descending of winch motor,, behind appropriate time, be converted to the Δ shape wiring running of higher speed more earlier with low-tach Y connection running.

2, the winch of tool ascending, descending control circuit according to claim 1, the rising of this control path, decline button have a normal opened contact of forward and backward relay through a manual switch cross-over connection.