CN210313006U - Shallow pit electric system additionally provided with elevator - Google Patents

Abstract

The utility model discloses a shallow pit electric system additionally provided with an elevator, which comprises a safety system and a reset control system; the safety system comprises a safety action control loop and an elevator operation control loop, wherein the safety action control loop comprises a bistable switch and a safety switch controller which are connected in series, and the bistable switch is associated with the manual opening and closing state of a bottom layer door of the elevator; the elevator operation control loop is used for controlling the on-off states of an operation contactor and a band-type brake contactor of the elevator according to the states of the stopping device and the safety switch controller; the reset control system comprises a reset loop which is electrically connected with the elevator control system, and the reset loop is used for resetting the bistable switch according to the states of the stop device and the safety switch controller; through the aforesaid the utility model discloses install the shallow pit electric system of elevator additional for the operation safety of shallow pit elevator all accords with new requirement to the safety standard of shallow pit elevator with maintenance safety, thereby has effectively guaranteed the security performance of shallow pit elevator.

Description

Shallow pit electric system additionally provided with elevator

Technical Field

The utility model relates to an old building (current building) installs elevator technical field additional, especially relates to an install shallow pit electrical system of elevator additional.

Background

With the progress of the times, the national policy gradually increases the support for installing elevators in old buildings so as to improve the dilemma of old people going up and down stairs. The requirement for the buried depth of underground pipelines of buildings is generally 0.7m (below a non-motor vehicle lane) according to the relevant national standard, because most of the underground pipelines (gas, cables, water pipes and the like) are buried in the place with the depth of about 0.7m underground, the pipelines are dug off when the underground pipelines are dug down, and if the engineering quantity of the mobile pipelines is large, the cost is high, and most of the underground pipelines cannot bear the load. For a conventional elevator, in order to ensure the safety of the maintenance personnel when the maintenance personnel overhauls the pit, the pit of the elevator shaft must have enough safety space. The minimum depth of the pit of the space needs 1.1m according to the normal condition, and for most of the additional elevators, 0.7m obviously cannot meet the requirement of the safety space of the pit. In order to solve the problem of the shallow pit for installing the elevator, a related department stipulates a new installation safety specification GB 28621 and 2012 new elevator manufacturing and installation safety specification installed in the existing building aiming at the installed elevator, and an electrical system of the existing elevator cannot meet the safety specification (particularly 5.7 and 5.8), so that the electrical system meeting the safety specification requirement needs to be redesigned for the installed elevator.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a new shallow pit electric system who installs the elevator additional to the installation safety standard who installs the elevator additional for the adaptation to the operation and the maintenance safety of installing the elevator additional are guaranteed.

In order to achieve the purpose, the utility model discloses an install shallow pit electric system of elevator additional, be provided with the retractable stopping device in the pit of elevator, when stopping the device and being in the state of extension, the stopping device can restrict the descending of elevator car, its characterized in that, shallow pit electric system includes safety system and reset control system; the safety system comprises a safety action control loop and an elevator operation control loop, wherein the safety action control loop comprises a bistable switch and a safety switch controller which are connected in series, and the bistable switch is associated with the manual opening and closing state of a bottom layer door of the elevator; the elevator operation control loop is used for controlling the on-off states of an operation contactor and a band-type brake contactor of the elevator according to the states of the stopping device and the safety switch controller; the reset control system comprises a reset loop electrically connected with the elevator control system, and the reset loop is used for resetting the bistable switch according to the states of the stop device and the safety switch controller.

Compared with the prior art, the shallow pit electrical system additionally provided with the elevator is provided with a safety system and a reset control system, a bistable switch arranged in the safety system is associated with the manual opening and closing state of a bottom layer door of the elevator, when the elevator operates normally, the bottom layer door of the elevator is in an automatic opening and closing state, a stop device is in a folding state, the bistable switch is connected with a safety action loop, so that the safety switch controller acts, the elevator operation control loop is connected, and an operation contactor and a band-type brake contactor work normally; when the elevator needs maintenance, firstly, a bottom layer door of the elevator is manually opened, at the moment, a bistable switch acts to disconnect a safety action control loop, the working state of a safety switch controller changes, so that the operation control loop of the elevator is disconnected, a coil loop of an operation contactor and a band-type brake contactor of the elevator is disconnected, the elevator exits from a normal operation state, and then, a stop device is manually placed in an extension state to ensure the maintenance space requirement of a shallow pit, so that the personal safety of maintenance personnel during maintenance is ensured; in addition, because the return circuit that resets according to end the stop device with the state of safety switch controller resets bistable switch can ensure to end the stop device and folded up, just can reset the elevator under the condition that elevator bottom layer door closed simultaneously, can know from this, through the aforesaid the utility model discloses install the shallow pit electric system of elevator additional, under the condition in shallow pit, both guaranteed the normal operating of elevator, also guaranteed the safety problem of elevator in the maintenance process, accord with the new safety standard requirement to installing the elevator additional.

Preferably, the stopping device is provided with a normally closed folding contact and a normally open extending contact for detecting the state of the stopping device, when the stopping device is in the folding state, the normally closed folding contact is in the conducting state, and the normally open extending contact is in the disconnecting state, and when the stopping device is in the extending state, the normally open extending contact is in the conducting state, and the normally closed folding contact is in the disconnecting state; the elevator operation control loop comprises an operation contactor and a first switch loop connected with the contracting brake contactor in series, the first switch loop comprises a normally closed folding contact and a normally open extending contact which are connected in series, and a normally open safety contact associated with the safety switch controller is further connected in parallel at two ends of the normally open extending contact.

Preferably, a foldable toe guard is further mounted on a bottom plate of the elevator car, a normally closed toe guard contact for detecting the state of the toe guard is mounted on the toe guard, and when the toe guard is in a folded state, the normally closed toe guard contact is in a connected state; the toe guard contact is connected in series in the first switch loop.

Preferably, the elevator operation control circuit further comprises a second switch circuit connected in series with the operation contactor and the band-type brake contactor and connected in parallel with the first switch circuit, the second switch circuit comprises a normally open car top maintenance contact, and the normally open car top maintenance contact can be connected with the second switch circuit through a normally open extension contact in the first switch circuit.

Preferably, the electrical system of a shallow pit for installing an elevator further comprises a normally closed additional limit contact installed in the elevator shaft, the normally closed additional limit contact operates before the car descends to the limit position, and the normally closed additional limit contact is connected in series in the second switch circuit.

Preferably, the elevator operation control circuit further comprises a third switch circuit and a fourth switch circuit which are respectively connected in series with the operation contactor and the band-type brake contactor, the third switch circuit comprises a normally open emergency electric knob contact and a normally open maintenance uplink contact of the elevator which are connected in series, a first connecting end is arranged between the normally open emergency electric knob contact and the normally open maintenance uplink contact, a second connecting end is arranged between the normally open car top maintenance contact and the normally closed additional limit contact in the second switch circuit, the first connecting end is electrically connected with the second connecting end, and the third switch circuit can be connected with the circuit through the normally open extension contact in the first switch circuit; the fourth switch loop comprises a normally open emergency electric knob contact of the elevator and a normally open emergency electric uplink contact of the elevator which are connected in series; and a normally open emergency electric knob contact in the third switch loop and an emergency electric knob contact in the fourth switch loop synchronously act.

Preferably, the reset control system further comprises a maintenance uplink loop electrically connected with a maintenance uplink signal end on the elevator control system and a maintenance downlink loop electrically connected with a maintenance downlink signal end on the elevator control system, wherein the maintenance uplink loop comprises a normally closed safety contact and a normally open maintenance uplink contact which are connected in series and are associated with the safety switch controller; the overhaul downlink loop comprises a normally closed safety contact and a normally open overhaul downlink contact which are connected in series and are associated with the safety switch controller.

Preferably, a normally closed reset switch contact connected in series with the operation contactor and the band-type brake contactor is further arranged on the elevator operation control loop; the reset circuit comprises a first reset circuit used for resetting the safety system, the first reset circuit comprises a normally closed folding contact, a normally closed safety contact associated with a safety switch controller, a normally closed car roof maintenance contact, a normally open reset switch contact and a reset controller which are connected in series, and the reset controller is used for controlling the state of the bistable switch; the normally closed reset switch contact and the normally open reset switch contact are both associated with a reset switch.

Preferably, the reset circuit further comprises a second reset circuit for resetting the elevator control system of the elevator, the second reset circuit comprises a normally closed folding contact, a normally open safety contact associated with the safety switch controller and a normally closed emergency electric contact which are connected in series, and the second reset circuit is electrically connected with the emergency electric signal terminal on the elevator control system.

Preferably, the reset control system further comprises an emergency electric uplink loop electrically connected with an emergency electric uplink signal end of the elevator control system and an emergency electric downlink loop electrically connected with an emergency electric downlink signal end of the elevator control system, the emergency electric uplink loop comprises a normally open emergency electric contact and a normally open emergency electric uplink contact which are connected in series, and the emergency electric downlink loop comprises a normally open emergency electric contact and a normally open emergency electric downlink contact which are connected in series; the normally open emergency electric contacts in the emergency electric uplink loop and the emergency electric downlink loop and the normally closed emergency electric contacts in the second reset loop act synchronously.

Preferably, the elevator operation control loop is also connected with an elevator safety and door lock loop in series; the safety system is also provided with a door lock detection loop, and the door lock detection loop comprises the elevator safety and door lock loop and a door lock controller which are connected in series; and a normally open door lock contact is also connected in series in the first reset loop and is associated with a door lock contactor of the elevator.

Preferably, the reset control system further comprises an alarm circuit, wherein the alarm circuit comprises a normally closed stop folding contact, a normally closed safety contact associated with the safety switch controller and an alarm connected in series.

Drawings

Fig. 1 is a schematic structural diagram of a safety system of a shallow pit electrical system for installing an elevator according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a reset control system of a shallow pit electrical system of an elevator according to an embodiment of the present invention.

Fig. 3 is the structural schematic diagram of the elevator in the maintenance state in the embodiment of the present invention.

Fig. 4 is the embodiment of the utility model provides an elevator is in the structural sketch map of normal operating condition.

Fig. 5 is a schematic view of an installation structure of the toe guard according to the embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, implementation principles, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in combination with the embodiments.

The utility model discloses a shallow pit electrical system for installing elevator, which is suitable for shallow pit elevator installed in old building (existing building), the shallow pit in the embodiment means that the pit depth is less than the safe depth of normal elevator, generally about 0.7m, because the pit is shallow, in order to ensure enough maintenance space, the stop device 10 arranged in the pit needs to be set to be foldable, the stop device 10 has a folding state (as shown in figure 4) lying in the pit and a stretching state (as shown in figure 3) vertically extending out of the pit, when the elevator normally operates, the stop device 10 needs to be adjusted to be folded, so as to ensure that the elevator car can move down to the pit, when the elevator needs to be maintained, the stop device 10 needs to be adjusted to be stretched, at this time, the stop device 10 extends out of the pit, so as to limit the down position of the elevator car, thereby ensuring the personal safety of the maintenance personnel in the pit, and after the maintenance work is finished, ensuring the stopping device 10 to be in a folding state to reset the elevator. In order to ensure that the operation of the elevator meets the safety code requirement of a shallow pit, the electric system in the embodiment comprises a safety system (shown in figure 1) and a reset control system (shown in figure 2), wherein the safety system is used for controlling the elevator car to safely operate under a normal condition and stopping the elevator car to normally operate under an abnormal condition, and the reset control system is used for ensuring the safe reset of the elevator.

As shown in fig. 1, the safety system includes a safety action control circuit H1 and an elevator run control circuit H2, the safety action control circuit H1 includes a bistable switch AIDS associated with a manually opened and closed state of the bottom landing door of the elevator and a safety switch controller J5 connected in series, the bistable switch AIDS being turned off when the elevator bottom landing door is manually opened. The elevator running control loop H2 is used for controlling the on-off states of the running contactor J1 and the brake contactor J2 of the elevator according to the states of the stopping device 10 and the safety switch controller J5. As shown in fig. 2, the reset control system includes a reset circuit H3 electrically connected to the elevator control system, the reset circuit H3 is used for resetting the bistable switch AIDS according to the states of the stopping device 10 and the safety switch controller J5, that is, the bistable switch AIDS can be reset only when the stopping device 10 is in the folding state, and is in the on state, so that the elevator is reset, and meanwhile, the elevator can be reset only when the elevator is judged to be in the abnormal operation state according to the safety switch controller J5. Therefore, the above can be known through the utility model discloses install the shallow pit electric system of elevator additional, under the condition in shallow pit, both guaranteed the normal operating of elevator, also guaranteed the safety problem of elevator in the maintenance process, accord with the new safety standard requirement to installing the elevator additional. In this embodiment, the safety switch controller J5 is a multi-contact switch contactor.

As shown in fig. 1 and 2, the stop device 10 is provided with normally closed folding contacts ZTSH1, ZTSH2 and normally open extending contacts ztsztz for detecting the state of the stop device 10. When the stop device 10 is in the folding state, the normally closed folding contacts ZTSH1 and ZTSH2 are in the conducting state, and the normally open extending contact ztszz is in the disconnecting state; when the stop device 10 is in the extended state, the normally open extension contact ztszz is in the on state, and the normally closed folding contacts ZTSH1, ZTSH2 are in the off state. Referring to fig. 1 again, the elevator operation control circuit H2 includes a first switch circuit H20 connected in series with an operation contactor J1 and a brake contactor J2, the first switch circuit H20 includes a normally closed folding contact ZTSH1 and a normally open extending contact ztsztz connected in series, and both ends of the normally open extending contact ztsztz are connected in parallel with a normally open safety contact SS1 associated with a safety switch controller J5. Under the normal state of elevator, stop device 10 is in the state of folding up, therefore, normally closed folding contact ZTSH1 is in the conducting state, normally open extension contact ZTSZ is in the off-state, safety action control circuit H1 is in the on-state, safety switch controller J5 is in the actuation state for normally open safety contact SS1 moves to the conducting state, thereby elevator operation control circuit H2 switches on, operation contactor J1 and band-type brake contactor J2 normally work. When the safety action control loop H1 is disconnected, the safety switch controller J5 cannot be attracted, so that the safety contact SS1 is disconnected, the elevator operation control loop H2 is disconnected, the operation contactor J1 and the band-type brake contactor J2 cannot be attracted, and the normal operation of the elevator is stopped.

If fig. 3 to 5, different with traditional elevator the utility model discloses in installing the shallow pit electrical system of elevator additional, still install retractable toeguard 11 on elevator car's the bottom plate 13, when the elevator is in normal condition, toeguard 11 is in the state of folding up, does not influence elevator car's normal down, when the elevator is in maintenance state or stranded people, changes toeguard 11 to the state of extending, avoids causing when moving to the flat bed position and stepping on the sky accident because of elevator car can not be accomplished. The toe guard 11 is provided with a normally closed toe guard contact TGS for detecting the state of the toe guard 11, and when the toe guard 11 is in the folded state, the normally closed toe guard contact TGS is in the connected state, and the normally closed toe guard contact TGS is connected in series in the first switch circuit H20. In the embodiment, the normal operation of the elevator is controlled by the state of the toe guard 11 through the arrangement of the normally closed toe guard contact TGS, so that the operation safety of the elevator is further enhanced. It should be noted that, the turning structure of the toe guard 11 in the present embodiment or the turning structure of the stopping device 10 in the above embodiments are all known in the art, and therefore, the description thereof is omitted.

Further, the elevator operation control loop H2 further comprises a second switch loop H21 connected in series with the operation contactor J1 and the brake contactor J2 and connected in parallel with the first switch loop H20, and the second switch loop H21 comprises a normally open car top maintenance contact AK21, and the normally open car top maintenance contact AK21 can be connected with the second switch loop H21 through a normally open extension contact ztszz in the first switch loop H20. In this embodiment, by setting the second switch circuit H21, when the elevator stops normal operation, the elevator operation control circuit H2 can be switched on by the second switch circuit H21, so that the elevator can be serviced for up or down traveling. Preferably, in order to prevent the elevator car from hitting the stopping device 10 and the toe guard 11 from hitting the pit when the elevator is in the maintenance state, a normally closed additional limit switch 12 is installed in the elevator shaft, a normally closed additional limit contact AULS is provided on the additional limit switch 12 for detecting the position of the elevator car, and before the elevator car is overhauled and goes down to the limit position, such as before the elevator car hits the stopping device 10 and the toe guard 11 hits the pit, the elevator car hits the additional limit switch 12, the normally closed additional limit contact AULS is disconnected, and the additional limit contact is connected in series in the second switch loop H21. When the elevator is overhauled and descends to the limit position, the normally closed additional limit contact AULS is disconnected, and the elevator stops.

Further, the elevator operation control loop H2 further includes a third switch loop H22 and a fourth switch loop H23 connected in series with the operation contactor J1 and the contracting brake contactor J2, respectively, the third switch loop H22 includes a normally open emergency electric knob contact AK11 and a normally open maintenance uplink contact ADS1 of the elevator connected in series, a first connection end a is arranged between the normally open emergency electric knob contact AK11 and the normally open maintenance uplink contact ADS1, a second connection end B is arranged between the normally open car top maintenance contact AK21 and the normally closed additional limit contact AULS in the second switch loop H21, the first connection end a and the second connection end B are electrically connected, and the third switch loop H22 can be further connected to the loop through a normally open extension contact tszz in the first switch loop H20. Through the first connecting end A and the second connecting end B which are electrically connected, in the car top overhauling process, when the car moves downwards to the normally closed additional limit contact AULS to act, the up-going contact ADS can be operated and overhauled, so that the car can be overhauled and ascended. The fourth switching loop H23 includes a normally open emergency electric knob contact AK 11' of the elevator and a normally open emergency electric up contact AS1 of the elevator connected in series. The normally open emergency electric knob contact AK11 in the third switch circuit H22 acts in synchronization with the normally open emergency electric knob contact AK 11' in the fourth switch circuit H23. In this embodiment, through the arrangement of the third switch loop H22 and the fourth switch loop H23, when the emergency electric knob switch is pressed, the normally open emergency electric knob contacts AK11 and AK 11' in the third switch loop H22 and the fourth switch loop H23 are turned on, and then the elevator car can realize emergency ascending, emergency descending, maintenance ascending and maintenance descending.

As shown in fig. 2, the reset control system further includes a maintenance uplink loop electrically connected to a maintenance uplink signal terminal on the elevator control system and a maintenance downlink loop electrically connected to a maintenance downlink signal terminal on the elevator control system, the maintenance uplink loop including a normally closed safety contact SS4 and a normally open maintenance uplink contact ADS2 connected in series and associated with the safety switch controller J5; the service downlink loop includes a normally closed safety contact SS4 and a normally open service downlink contact ADX connected in series in association with a safety switch controller J5. In this embodiment, since the maintenance up-link circuit and the maintenance down-link circuit are both connected in series to the normally closed safety contact SS4, the maintenance up-link and down-link can be realized only when the safety operation control circuit H1 is open. In this embodiment, the maintenance signal end of the elevator control system is electrically connected to a normally closed car top maintenance contact AK22, and the maintenance uplink loop and the maintenance downlink loop are both connected in series to a normally open car top maintenance contact AK22', and the normally open car top maintenance contact AK22' is linked to the normally closed car top maintenance contact AK 22.

Further, as shown in fig. 1 and 2, the elevator operation control circuit H2 is further provided with a normally closed reset switch contact FWS connected in series with the operation contactor J1 and the brake contactor J2, the reset circuit includes a first reset circuit H30 for resetting the safety system, the first reset circuit H30 includes a normally closed folding contact ZTSH2, a normally closed safety contact SS2 associated with the safety switch controller J5, a normally closed car roof access contact AK23, a normally open reset switch contact FWS2 and a reset controller J4 connected in series, and the reset controller J4 is used for controlling the state of the bistable switch AIDS; the normally closed reset switch contact FWS1 and the normally open reset switch contact FWS2 are each associated with a reset switch, i.e., when the reset switch is actuated, the normally closed reset switch contact FWS1 is open and the normally open reset switch contact FWS2 is closed. Through the setting of first return circuit H30, only when satisfying simultaneously that stop device 10 is in the folding state, the elevator is in abnormal operating condition, the car roof overhauls these several conditions of completion, the elevator can reset, has guaranteed that the elevator operation return circuit is in the off-state when the elevator resets moreover to the safety of having guaranteed the elevator resets. Preferably, the reset circuit further comprises a second reset circuit H31 for resetting the elevator control system of the elevator, the second reset circuit H31 comprises a normally closed folding contact ZTSH2, a normally open safety contact SS3 associated with the safety switch controller J5 and a normally closed emergency electric contact AK12 which are connected in series, and the second reset circuit H31 is electrically connected with an emergency electric signal terminal on the elevator control system. Through the second reset circuit H31, when the stop device 10 is in the folded state, the elevator is in the abnormal operation state, and the emergency electric knob is not actuated, the elevator control system is reset, and the elevator returns to the normal operation state.

As shown in fig. 2, the reset control system also includes an alarm circuit including a normally closed stop folding contact ZTSH2, a normally closed safety contact SS2 associated with safety switch controller J5, and an alarm BJ connected in series. Through the setting of this warning return circuit, after the manual opening elevator floor layer door, if the stop device is not opened to the extension state, the warning return circuit switch-on, alarm BJ sends alarm signal. In this embodiment, the alarm BJ is an audible and visual alarm.

In addition, the reset control system also comprises an emergency electric uplink loop electrically connected with an emergency electric uplink signal end of the elevator control system and an emergency electric downlink loop electrically connected with an emergency electric downlink signal end of the elevator control system, wherein the emergency electric uplink loop comprises a normally open emergency electric contact AK12 'and a normally open emergency electric uplink contact AS2 which are connected in series, and the emergency electric downlink loop comprises a normally open emergency electric contact AK 12' and a normally open emergency electric downlink contact AX which are connected in series; normally open emergency electric contacts AK 12' in the emergency electric uplink circuit and the emergency electric downlink circuit act synchronously with normally closed emergency electric contacts AK12 in the second reset circuit H31.

Preferably, the safety and door lock circuits of the elevator are also connected in series in the elevator operation control circuit H2. The safety system is also provided with a door lock detection loop, the door lock detection loop comprises an elevator safety and door lock loop H4 and a door lock controller J3 which are connected in series, a normally open door lock contact JMS is also connected in series in the first reset loop H30, and the normally open door lock contact JMS is associated with the door lock contact J3. The elevator safety and door lock loop H4 is connected in series in the elevator operation control loop H2, so that the elevator door and all safety switches are in a closed state when the elevator operates normally, and the safety operation of the elevator is ensured. When the door lock and the safety switch of the elevator are both in a safe state, the door lock contactor J3 is closed, the normally open door lock contact JMS is connected, and the first reset circuit can be connected.

With reference to the foregoing embodiment and fig. 1 and 2, the principle of the electrical system with a shallow pit for an elevator according to the present invention will be described in detail below, and for convenience of description, eight circuit nodes 101 to 108 are labeled in fig. 1, and nine circuit nodes 301 to 309 are labeled in fig. 2.

1. Referring to fig. 1, a loop of node 101 → 102 → 103 → 105 → 106 → 108: in the normal state of the elevator, a normally open extension contact ZTSZ between the node 105 and the node 106 is disconnected, a safety contact SS1 is connected, an elevator operation control loop H2 is connected, and coil loops of an operation contactor J1 and a band-type brake contactor J2 can be attracted under the control of output ends M1Y1 and M2Y2 of an elevator control system respectively. When a bottom layer door entering a pit is manually opened, the bistable switch AIDS is disconnected, the safety switch controller J5 is released, the safety contact SS1 is disconnected, the operation contactor J1 and the band-type brake contactor J2 cannot be attracted, and the elevator stops a normal operation state; when the first reset circuit H30 and the second reset circuit H31 are connected, the bistable switch AIDS is connected, the safety switch controller J5 is closed, the safety contact SS1 is connected, and the coil circuits of the operating contactor J1 and the brake contactor J2 can be connected again.

2. Referring to FIG. 2, node 301 → 302 → 303 → 304: when the elevator is not in the maintenance state, the car top maintenance contact AK23 is closed frequently to be switched on, the stopping device 10 is in the folding state, all hoistway doors are closed and locked, and all elevator safety switches are in the closing state, the door lock contactor J3 is switched on (the normally open door lock contact JMS is switched on), and meanwhile, the points are met, the reset controller J4 of the bottom floor door bistable switch AIDS can be switched on, and the reset is effective, so that the safety reset is ensured.

3. Please refer to FIG. 1, 103 → 104 → 105: when the elevator is in an overhauling running state, the stopping device 10 is in an extending position, the normally closed folding contact ZTSH1 is disconnected, the normally open car top overhauling contact AK21 is connected, and when the elevator car is about to collide the movable stopping device 10, the normally closed additional limit contact AULS is disconnected, so that the coil loops of the running contactor J1 and the band-type brake contactor J2 cannot be connected, and the elevator cannot run; if the maintenance is going upwards, the normally open maintenance up contact ADS1 is closed, so that nodes 104 to 105 are closed and the elevator can run.

4. Please refer to fig. 2, 301 → 302 → 309: when the stopping device 10 is in the folding state, the normally closed folding contact ZTSH2 is switched on, the bistable switch AIDS representing the elevator safety action is in the closed state, the safety switch controller J5 is closed, the normally open safety contact SS3 is closed, the two points are met simultaneously, the nodes 301 to 309 can be switched on, the elevator control system can quit the emergency electric state, and the elevator can normally run.

5. Please refer to node 301 → 302 → 303 → 308 of fig. 2: when the bottom layer door entering the pit is manually opened, the bistable switch AIDS is switched off, so that the safety switch controller J5 is released, the normally closed safety contact SS2 is switched on, and when the stopping device 10 is in a folding state, the normally closed folding contact ZTSH2 is switched on, so that the audible and visual alarm BJ is powered on, and sends out visual and auditory signals to prompt the stopping device 10 to be in a non-action position; when the stop device 10 is manually unfolded, the normally closed folding contact ZTSH2 is disconnected, the audible and visual alarm BJ is powered off, and the visual and audible signals are stopped.

6. For the toe guard 11, please refer to fig. 1, the node 103 → 104 → 105: under the normal state of the elevator, the normally open car roof inspection contact AK21 and the normally open emergency electric normally open contacts AK11 and AK 11' are both disconnected, when the normally closed toe guard TGS is disconnected, nodes 103 to 104 and nodes 103 to 105 are both disconnected, so that coil loops of the operating contactor J1 and the band-type brake contactor J2 cannot be connected, and the normal operation of the elevator is stopped. When in overhauling operation or emergency electric operation, the normally open car roof overhauling contact AK21 or the normally open emergency electric knob contact AK11 and AK 11' are connected, the stop device 10 is in an extending position, the normally closed folding contact ZTSH1 is disconnected, the normally open extending contact ZTSZ is connected, when the toe guard 11 which is not retracted collides with the ground of a pit, the normally closed additional limit contact AULS is disconnected, if the overhauling is downward, the nodes 104 to 105 cannot be connected (or the nodes 104 to 105 and 107 to 108 cannot be connected if the emergency electric operation is downward), so that the coil loops of the operating contactor J1 and the band-type brake contactor J2 cannot be connected, and the elevator cannot operate. If and only if the maintenance is going upward, the normally open maintenance up contact ADS1 is turned on (or the normally open emergency power up contact AS1 is turned on when the maintenance is going upward), so that the terminals 103 to 106 are turned on and the elevator can run.

To sum up, through the aforesaid the utility model discloses install the shallow pit electric system of elevator additional for the operation safety of shallow pit elevator all accords with new requirement to the safety standard of shallow pit elevator with maintenance safety, thereby has effectively guaranteed the security performance of shallow pit elevator.

The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.

Claims (12)

1. A shallow pit electrical system for additionally installing an elevator is characterized in that a retractable stopping device is arranged in a pit of the elevator, and when the stopping device is in an extending state, the stopping device can limit the descending of an elevator car; the safety system comprises a safety action control loop and an elevator operation control loop, wherein the safety action control loop comprises a bistable switch and a safety switch controller which are connected in series, and the bistable switch is associated with the manual opening and closing state of a bottom layer door of the elevator; the elevator operation control loop is used for controlling the on-off states of an operation contactor and a band-type brake contactor of the elevator according to the states of the stopping device and the safety switch controller; the reset control system comprises a reset loop electrically connected with the elevator control system, and the reset loop is used for resetting the bistable switch according to the states of the stop device and the safety switch controller.

2. The electrical system of claim 1, wherein the stopping device is provided with a normally closed folding contact and a normally open extending contact for detecting the state of the stopping device, the normally closed folding contact is in a conducting state when the stopping device is in a folding state, the normally open extending contact is in an off state, and the normally open extending contact is in a conducting state when the stopping device is in an extending state, and the normally closed folding contact is in an off state; the elevator operation control loop comprises an operation contactor and a first switch loop connected with the contracting brake contactor in series, the first switch loop comprises a normally closed folding contact and a normally open extending contact which are connected in series, and a normally open safety contact associated with the safety switch controller is further connected in parallel at two ends of the normally open extending contact.

3. The shallow pit electric system for adding an elevator as claimed in claim 2, wherein a foldable toe guard is further installed on a floor of an elevator car, a normally closed toe guard contact for detecting a state of the toe guard is installed on the toe guard, and when the toe guard is in a folded state, the normally closed toe guard contact is in a connected state; the toe guard contact is connected in series in the first switch loop.

4. The shallow pit electrical system for installing an elevator of claim 3, wherein the elevator operation control loop further comprises a second switch loop connected in series with the operating contactor and the brake contactor and in parallel with the first switch loop, the second switch loop comprising a normally open top service contact that can be connected to the second switch loop through a normally open extended contact in the first switch loop.

5. The shallow pit electrical system for an elevator of claim 4, further comprising a normally closed additional limit contact installed in the elevator hoistway, the normally closed additional limit contact acting before the car descends to a limit position, the normally closed additional limit contact being connected in series in the second switch circuit.

6. The shallow pit electric system for adding an elevator as claimed in claim 4, wherein the elevator operation control loop further comprises a third switch loop and a fourth switch loop connected in series with the operation contactor and the band-type brake contactor respectively, the third switch loop comprises a normally open emergency electric knob contact and a normally open maintenance uplink contact of the elevator connected in series, a first connection end is arranged between the normally open emergency electric knob contact and the normally open maintenance uplink contact, a second connection end is arranged between the normally open car top maintenance contact and the normally closed additional limit contact in the second switch loop, the first connection end and the second connection end are electrically connected, and the third switch loop can be further connected to the loop through the normally open extension contact in the first switch loop; the fourth switch loop comprises a normally open emergency electric knob contact of the elevator and a normally open emergency electric uplink contact of the elevator which are connected in series; and a normally open emergency electric knob contact in the third switch loop and an emergency electric knob contact in the fourth switch loop synchronously act.

7. The shallow pit electrical system for installing an elevator as claimed in claim 6, wherein the reset control system further comprises an overhaul uplink loop electrically connected to an overhaul uplink signal terminal on the elevator control system and an overhaul downlink loop electrically connected to an overhaul downlink signal terminal on the elevator control system, the overhaul uplink loop comprising a normally closed safety contact and a normally open overhaul uplink contact associated with the safety switch controller connected in series; the overhaul downlink loop comprises a normally closed safety contact and a normally open overhaul downlink contact which are connected in series and are associated with the safety switch controller.

8. The shallow pit electric system for installing the elevator as claimed in claim 6, wherein a normally closed reset switch contact connected in series with the running contactor and the brake contactor is further arranged on the elevator running control loop; the reset circuit comprises a first reset circuit used for resetting the safety system, the first reset circuit comprises a normally closed folding contact, a normally closed safety contact associated with a safety switch controller, a normally closed car roof maintenance contact, a normally open reset switch contact and a reset controller which are connected in series, and the reset controller is used for controlling the state of the bistable switch; the normally closed reset switch contact and the normally open reset switch contact are both associated with a reset switch.

9. The electrical system of claim 8, further comprising a second reset circuit for resetting an elevator control system of an elevator, the second reset circuit comprising a normally closed folding contact, a normally open safety contact associated with the safety switch controller, and a normally closed emergency power contact connected in series, the second reset circuit being in electrical communication with an emergency power signal terminal on the elevator control system.

10. The shallow pit electrical system for installing an elevator as claimed in claim 9, wherein the reset control system further comprises an emergency electrical uplink loop electrically connected to an emergency electrical uplink signal terminal of the elevator control system and an emergency electrical downlink loop electrically connected to an emergency electrical downlink signal terminal of the elevator control system, the emergency electrical uplink loop comprises a normally open emergency electrical contact and a normally open emergency electrical uplink contact connected in series, and the emergency electrical downlink loop comprises a normally open emergency electrical contact and a normally open emergency electrical downlink contact connected in series; the normally open emergency electric contacts in the emergency electric uplink loop and the emergency electric downlink loop and the normally closed emergency electric contacts in the second reset loop act synchronously.

11. The shallow pit electrical system for adding an elevator as claimed in claim 8, wherein the elevator operation control loop is also connected in series with the safety and door lock loop of the elevator; the safety system is also provided with a door lock detection loop, and the door lock detection loop comprises the elevator safety and door lock loop and a door lock controller which are connected in series; and a normally open door lock contact is also connected in series in the first reset loop and is associated with a door lock contactor of the elevator.

12. The electrical system of claim 8, further comprising an alarm circuit comprising a normally closed stop folding contact, a normally closed safety contact associated with the safety switch controller, and an alarm connected in series.

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