DE8702118U1 - Goods elevator - Google Patents

Description

PATENT ATTORNEYS DURM & DURM EUROPEAN PATENT ATTORNEYS

M 3441/87Qt)D 6 February 1987

DR.-ING. KLAUS DURM DIPL.-ING. FRANK DURM

D-7500 KARLSRUHE 21
FELIX-MOTTL-STRASSE 1 A

TELEPHONE:(0721) 85 33 55 TELEX: 7 826 322 durm d TELEGRAM: DURMPATENT

Walter Mayer-Conveyor Technology GmbH, Kraichtal

7527 Kraichtal-Oberacker

Brettener Strasse 20

Goods elevator

The invention relates to a goods lift with a car on which two bistable level switches are arranged, which travel along two parallel tracks and are switched by actuating elements provided on the guide rail in the area of the floors, with two bistable level relays, which are in series with the level switches, with a control circuit which has two door zone relays and two floor relays, and with a safety circuit.

A wide variety of control and safety devices are known for goods lifts, and on the one hand, forced-operated mechanical switches and on the other hand, electrical switches of all kinds are used. Compliance with safety regulations always requires a very considerable amount of effort in terms of switching, control, monitoring and safety devices, which have a significant impact on the material and time required for the manufacture and maintenance of these lifts.

The object of the invention is to design a simplified goods lift with a control and safety circuit, the electrical components and the electrical circuit of which are selected in such a way that the manufacturing and maintenance costs can be reduced considerably without any loss of safety.

To solve the problem, a goods lift of the type mentioned at the beginning is assumed. The problem is solved by arranging two bistable control switches on the car next to the level switches, in the path of which there are actuating elements on each floor that are provided on the guide rail, and by connecting each control switch in series with one of the door zone relays, and by connecting not only two normally open contacts of the two level relays in series with two normally open contacts of the two door zone relays in series, but also connecting one normally closed contact of each of the two door zone relays with one of the floor relays.

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relay is connected in series. These measures make it possible to replace the mandatory safety switches required by the regulations for goods lifts with simple switches, which are monitored in accordance with a higher safety regulation. The use of electrical components and the circuitry effort are astonishingly low, and the space required is small.

It is advantageous if the two control switches are located one behind the other and they travel on a common track. This minimizes the space required.

Bistable magnetic switches are used as control switches and as flush switches, and the actuating elements are switching magnets.

The proposed goods lift is described in more detail below using an example embodiment in which two floors are indicated, with reference to the attached drawings. In the drawings

B nungen show Fig. &igr; a goods elevator, schematic and

shown simplified in a side view;

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Fig. 2 a, b the control and safety circuit

of the goods lift according to Figure 1.

The simplified goods elevator shown in Figure 1 essentially consists of a car 1, a guide rail 2, an upper door 3, a lower door 4 and a control box 5.

The car 1 is connected to the control box 5 via a multi-core hanging cable 6. On the side of the

A locking magnet RM is located in the elevator car 1, the armature of which moves a curved piece 7, which actuates the locking bolts (not shown) of the two doors 3 and 4 in the area of the floors. A switch box 8 is attached to the top of the elevator car 1, on the back of which - indicated by dashed lines - two bistable flush switches Fl and F2 and two bistable control switches KS1 and KS2 are arranged. All four switches are magnetic switches of the same design and work as so-called grids.

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The elevator car 1 is operated electro-oil-hydraulically, this is done by a cylinder-piston unit 9 which is located in a shaft pit 10 and is operated by an electric pump motor.

The guide rail 2 serves to guide the elevator car 1 vertically and is attached to the side wall of the elevator shaft (not shown). On this guide rail 2, at the height of each door 3 or on each arm 11 a retaining plate 12 or 13, on in which a group of four actuators Nl, S2, S3, S4 or S5, N6, N7, N8 is arranged. These actuators are permanent switching magnets that are arranged along three parallel Tracks fl, kl+2 and f2 are opposite the two level switches Fl and F2 as well as the two control switches KSl and KS2 as soon as the car 1 reaches the area of the relevant door 3 or 4. The letters "S" or "N" of the reference numbers of the eight actuators indicate whether the magnetic pole "south" or "north" is opposite the switch in question and switches it into the open or closed locking position. If the switching point indicated by a cross line 14 of one of the magnetic switch in the middle of a switching magnet, then the switching process takes place.

The manually operated doors 3 and 4 have locking contacts (not shown) on their locking latches for monitoring purposes, which report as soon as the latch is not engaged. On the doors 3 and 4 there are connectors 15, 16, with

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-&dgr;&igr; with the help of which the buttons for the up and down travel, the indicator lamps, the locking contacts and the door contacts are connected to the control box 5. On the frame of the lower door 4 - only accessible from the inside - an off switch AS is provided, which The actuation engages and prevents the elevator car 1 from sinking into the switching pit 10 during maintenance work in the shaft pit 10.

It is understood that the proposed magnetic switches can also be replaced by other switches, namely inductive switches, mechanically operated switches and light barriers, to which the corresponding actuating elements are then used instead of the switching magnets. These actuating elements - which can be, for example, curved sections or switching backs - are indicated in Figure by parallel double lines following the switching magnets shown there.

The function of the goods lift described is briefly explained below using the circuit diagram of the control and safety circuit shown in Figure 2 a, b.

If the motor switch MS and control fuse Ss are switched on and the fault signaling relay d4 is not energized, there is voltage at terminal 1 and at the transformer TR.

Voltage is present at terminal 5 via the closed safety switches DS, FKF, SK and AS (see current path 2).

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-&Tgr;&Igr; When doors 3 and 4 are closed, the door contacts TKu and TKo are closed. Then voltage is present at terminal 7 (current path 2).

Voltage for the "Up" and "Down" buttons is taken from terminal 7.

Upward journey:

The "Open" button II (current path 3) is pressed and thus closes. For this reason, voltage is present via terminal II, break contacts d31 (35/36) and StI (41/42) on the floor relay StII.

Floor relay StII goes into self-holding mode via normally open contact StII (23/24) (current path 4).

The locking magnet RM is supplied with voltage via the normally open contact StII (13/14) (current path 2). RM locks the door 4. This closes the locking contact RKo or

^RKu ·

This means that voltage is applied to terminal 9 (current path 2). Voltage is applied to contactor Cl via normally open contact StII (33/34) (current path 4) and closed contacts C2 and Th (95/90). Pump motor switches on.

The locking magnet RM on car 1 is supplied with voltage via the normally open contact Cl (13/14) (current path 1).

When the upper floor 0 is reached, the level switch Fl is closed first. This is the case if the level switch Fl is opposite the second actuator S2.

This energizes the flush relay dl (current path 6); the normally open contact dl (13/14) (current path 5) closes.

Shortly after the flush switch Fl closes, the control switch KSl also closes, as soon as the control switch KSl is positioned opposite the third actuating element S3.

This energizes door zone relay d31 (current path 7). Normally open contact d31 (47/48) (current path 5) closes.

Now contactor Cl is also supplied with voltage via normally open contacts dl (13/14) and d31 (47/48) (current path 5).

At the same time, the normally closed contact d31 (35/36) (current path 3) of the door zone relay d31 opens when the control switch KSl is opposite the third actuator 3. This de-energizes the floor relay StII. The normally open contact StII (33/34) (current path 4) and StII (13/14) (current path 2) open.

Contactor Cl continues to be supplied with voltage via d31 (47/48) and dl (13/14) (current path 5).

Locking magnet RM is also supplied with voltage through closed normally open contact Cl (13/14) (current path 1).

When the floor level marked with a small triangle Figure 1 is reached, the level switch Fl is switched off (opens). This happens when Fl is

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• « &igr; ·

actuator Nl. This causes

Flush relay dl is de-energized (current path 6), so that normally open contact dl (13/14) (current path 5) opens.

This de-energizes the protection circuit Cl. The pump motor switches off.

Locking magnet RM is de-energized via normally open contact Cl (13/14) (current path 1). The door is unlocked. 10

The Still level indicator is switched on via the normally open contact d31 (53/54) (current path 6).

Downhill ride:

The "Down" button (current path 3) is pressed and therefore closes. This means that voltage is applied to the floor relay StI via terminal I, break contacts d32 (35/36) and StII (41/42).

Floor relay StI goes into self-holding mode via contact StI (23/24) (current path 4).

The locking magnet RM is supplied with voltage via the normally open contact StI (13/14) (current path 2). RM locks the door. This closes the locking contact RKo or RKu.

This means that voltage is present at terminal 9 (current path 2).

Voltage is applied to terminal MV via normally open contact StI (33/34) (current path 5) and normally closed contact Cl (21/22) and thus to contactor C2 and solenoid valve MV, through

-&igr;&ogr;&iacgr; which opens the lowering valve on the cylinder-piston unit 9 .

The locking magnet RM is supplied with voltage via the normally open contact C2 (13/14) of the contactor C2 (current path 2).

When the lower floor U is reached - this is the case when the level switch F2 is opposite the sixth switching magnet N6 - the level switch F2 is closed first.

This energizes flush relay d2 (current path 6) and closes normally open contact d2 (13/14) (current path 5).

Shortly after the flush switch F2 closes, the control switch KS2 also closes as soon as the control switch KS2 is above the seventh switching magnet N7.

This energizes the door zone relay d32 (current path 7). Normally open contact d32 (47/48) (current path 5) closes.

Now contactor C2 and solenoid valve MV are also supplied with voltage via the normally open contact d2 (13/14) and the normally open contact d32 (47/48) of the door zone relay d32 (current path 5).

At the same time, the break contact d32 of the door zone relay d32 (35/36) opens (current path 4). This de-energizes the floor relay StI, whose make contact

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- 11 -

Open contacts StI (33/34) (current path 5) and StI (13/14) (current path 2).

Contactor C2 and solenoid valve MV continue to be supplied with voltage via d32 (47/4B) & and d2 (13/14) (current path 5).

The locking magnet RM is also supplied with voltage through C2 (13/14) (current path 2).

When the lower floor level U, indicated by a triangle in the figure, is reached - i.e. when the level switch F2 is above the fifth switching magnet S5 - the level switch F2 is switched off, i.e. it opens.

This de-energizes flush relay d2 (current path 6).

Now the normally open contact d2 (13/14) of the floor relay StI (current path 5) opens.

This de-energizes the contactor C2 and the solenoid valve MV. The lowering valve on the cylinder-piston unit 9 closes.

The locking magnet RM is de-energized via the normally open contact C2 (13/14) (current path 2). Door 4 is unlocked. 25

The Still status indicator is switched on via the normally open contact d32 (53/54) (current path 7).

Readjustment with the door open;

If the elevator car 1 is on the upper floor 0, the control switch KSl is activated and thus the door zone relay d31 is energized (current path 7).

Mil &igr; I I I

If the lift car 1 is on the lower floor U, control switch KS2 is activated and thus door zone relay d32 is energized (current path 7).

Then either the normally open contact d31 (47/48) of one door zone relay d31 or the normally open contact d32 (47/48) (current path 5) of the other door zone relay d32 is closed.

If the car now sinks slightly, e.g. as a result of loading, the level switch Fl closes because it passes through the actuating element Nl and energizes the level relay dl (current path 6).

This closes the normally open contact dl (13/14) (current path 5) of the flush relay dl and the pump motor switches on. When the floor level is reached again, the flush switch Fl opens again and the flush relay dl is de-energized (current path 6).

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Finally, the normally open contact dl ( ^�Lgr; 3/14) (current path 5) of the flush relay dl opens and the pump motor switches off.

If the elevator car is flush with the respective floor level and is unloaded, it rises slightly.

Then the level switch F2 is closed and energizes the level relay d2 (current path 6).

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This closes the normally open contact d2 (13/14) (current path 5) of the leveling relay d2. The solenoid valve MV opens the lowering valve on the cylinder-piston unit 9 and the car 1 lowers. Once the piecemeal level is reached, leveling switch P2 opens again. Leveling relay d2 is de-energized (current path 6).

The normally open contact d2 (13/14) (current path 5) opens and the lowering valve is closed again by actuating the solenoid valve MV.

The level switches Fl and F2, the control switches KSl and KS2 as well as the associated level relays dl, d2 and the door zone relays d31, d32 are checked as follows for non-opening or non-dropping.

Failure to open the level switch Fl or failure to release the level relay dl:

If the level switch Fl or the level relay dl "gets stuck", the car 1 will cross the floor level in an upward direction. When the floor level is crossed, the other level switch F2 is activated* This energizes the level relay d2 (current path 6).

The fault signal relay d4 is energized (current path 1) via the normally open contact dl (23/24) of the faulty flush relay and the normally open contact d2 (23/24) of the other flush relay d2. Its normally open contact d4 (13/14) (current path 2) causes self-holding. The normally closed contact d4 (21/22) (current path 2) switches the system off.

If the level switch Fl or the level relay dl gets stuck when leaving the car from the upper floor, the system switches off accordingly, namely when the level switch F2 or the level relay dl is operated. relay d2 when reaching the lower floor U.

Failure of level switch F2 to open or failure of level relay d2 to drop out:

If the level switch F2 or the level relay e £ "gets stuck", the car 1 will travel over the floor level in the downward direction. When this floor level is traveled over, the other level switch Fl is actuated. This energizes the level relay dl (current path 6).

Via normally open contact dl (23/24) of the flush relay dl and

Normally open contact d2 (23/24) of the faulty flush relay d2 energizes the fault signal relay d4 (current path 1) and the system is switched off.

If the level switch F 2 or the level relay d2 remains

when leaving the lower floor U, the system switches off accordingly when Fl or dl is pressed when the upper floor is reached

Failure to open the control switches KSl or KS2. Non-drop-out of the two door zone relays d31 or d32:

If the control switch KS1 or the door zone relay d31 or the other control switch KS2 or the other door zone relay d32 remains when leaving a

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If the system is "stuck" on the other floor, the system is switched off via the fault signal relay d4 when the other floor is reached, because the normally open contact d31 (13/14) and the normally open contact d32 (13/14) (current path 2) are closed at the same time.

The selection of a floor in which a defective control switch KS1 or KS2 or a "hanging" door zone relay d31 or d32 would become operational is effectively prevented by break contacts d31,(35/36) (current path 3) or d32,(35/36)(current path 4).

In the case of goods lifts in which the car 1 is suspended from a chain, two further safety switches are provided in the circuit diagram (current path 2), namely the slack chain switch SK and the safety catch contact FKF. The pressure switch DS switches in the event of excess pressure in the cylinder-piston unit 5 a*·»
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M3441/87

February 6, 1987

Compilation of the reference numbers used

1 car

2 Guide rail

3 Door (top) 4 Door (bottom)

5 Switch box

6 hanging cable RM locking magnet

7 Curve section

8 Switch box

Fl flush switch

F2 Flush switch

KSl control switch

KS2 control switch

9 cylinder-piston unit

10 Shaft pit

11 Arm

12 retaining plate

13 Retaining plate

Nl Actuator

52 Actuator

53 Actuator

54 Actuator

55 Actuator S6 Actuator

N7 Actuator

N8 Actuator

fl Train kl+2 Train f3 Train 14 slash 15 Connectors 16 Connectors AS Off switch MS Engine switch Ss Tax security d4 Fault signal relay TR transformer DS Pressure switch FKF Catch contact ss Slack chain switch TKu Door contact TKo Door contact II Button "Up" I Button "Down" StII Floor relay StI Floor relay RKu Latch contact RKo Latch contact Cl Protection C2 Protection 0 upper floor U lower floor dl Flush relay d2 Flush relay d31 Door zone relay d32 Door zone relay MV magnetic valve StII Level indicator stm Level indicator

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Claims (3)

-&Igr;&Ogr;Sch 3441/87 GBB 6 February 1987 Claims 1. Goods lift with a car on which two bistable level switches are arranged, which travel along two parallel tracks and are switched by actuating elements provided on the guide rail in the area of the floors, with two bistable level relays which are in series with the level switches, with a control circuit which has two door zone relays and floor relays, and with a safety circuit, characterized in that on the car (1) next to the level switches (Fl and F2), two bistable control switches (KSl and KS2) are arranged, in the track of which at each floor (0 and v ) there are actuating elements (S3 and N7) provided on the guide rail (2), and that each control switch (KSl and KS2) is connected in series with one of the door zone relays (d31 and d32), and that as a safety circuit not only two normally open contacts in series (dl, 23/24 and d2, 23/24) of the two flush relays (dl and d2) are connected in parallel with two normally open contacts (d31, 13/14 and d32, 13/14) of the two door zone relays (d31 and d32), but also one opening contact (d31, 35/36 or d32, 35/36) of each of the two door zone relays (d31 or d32) is connected with a IML · · - 17 - the floor relays (StII or StI) are connected in series. 2. Goods lift according to claim 1, characterized characterized in that the two control switches (KSl and KS2) are located one behind the other and run on a common track (kl+2). 3. Goods lift according to claim 1 or 2, characterized in that bistable magnetic switches serve as control switches (KS1 and KS2) and as level switches (Fl and F2) and the actuating elements (Nl, S2, S3, S4, S5, S6, N7, N8) are switching magnets . 15 20 25 30 35