CN217148226U - Safety maintenance system for escalator and escalator system - Google Patents

Abstract

The utility model discloses a safety maintenance system and staircase system for automatic escalator, the safety maintenance system includes safety maintenance return circuit and maintenance device, the safety maintenance return circuit includes first maintenance seat, first safety module, second maintenance seat, second safety module, the first pin of first maintenance seat is connected to outside automatic escalator through the second terminal electricity of first safety module; the second pin of the first maintenance seat is electrically connected to the external escalator through the fourth terminal of the first safety module; the service device includes a service plug, an up button, a down button, such that when the service plug is connected to the first service seat, the service device is configured to send an up signal to the external escalator through the second terminal of the first safety module and a down signal to the external escalator through the fourth terminal of the first safety module. The utility model provides a technical scheme realizes the maintenance work to the staircase based on maintenance device and safety circuit, safe and reliable.

Description

Safety maintenance system for escalator and escalator system

Technical Field

The utility model relates to an staircase field, in particular to a safety inspection system and staircase system for automatic escalator.

Background

The escalator belongs to one of special equipment with high risk, the quality of the running state of the escalator is directly related to the life safety of passengers, and the use efficiency of the whole building is directly influenced. Therefore, in order to ensure the safe operation of the escalator, prevent accidents, fully exert the efficiency of equipment and prolong the service life, regular maintenance and repair of the escalator are required. In order to facilitate maintenance and guarantee the safety of maintenance personnel, a safe and reliable control mode is needed, and in the maintenance state, the escalator exits from the normal operation state and can only be operated by the maintenance personnel.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a safe maintenance system and staircase system for automatic escalator based on overhaul device and maintenance socket cooperation are used.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a safety overhaul system for an escalator comprises a safety overhaul loop and an overhaul device which are matched with each other for use, wherein the safety overhaul loop comprises a first safety loop and a second safety loop, the first safety loop comprises a first overhaul seat and a first safety module, the second safety loop comprises a second overhaul seat and a second safety module, the first overhaul seat and the second overhaul seat respectively comprise a plurality of pins, and the first safety module and the second safety module respectively comprise a plurality of terminals; the first pin of the first maintenance seat is electrically connected with the first terminal of the first safety module, the first terminal is also electrically connected with the second terminal of the first safety module, and the second terminal of the first safety module is electrically connected with an external escalator; the second pin of the first maintenance seat is electrically connected with the third terminal of the first safety module, the third terminal is also electrically connected with the fourth terminal of the first safety module, and the fourth terminal of the first safety module is electrically connected with an external escalator; the third pin of the first maintenance seat is electrically connected with the fifth terminal of the first safety module, the fifth terminal is also electrically connected with the first terminal of the second safety module, and the first terminal of the second safety module is also electrically connected with the first pin of the second maintenance seat;

the maintenance device includes the maintenance plug, goes upward the button and down the button, it is configured to send the signal of going upward to go upward the button, it is configured to send down the signal down to go downward the button, the maintenance plug with first maintenance seat adaptation, thereby work as the maintenance plug connection to when first maintenance seat, the maintenance device is configured to pass through the second terminal of first safety module sends and goes upward signal to outside escalator, and, pass through the fourth terminal of first safety module sends down signal to outside escalator.

Further, the service device has a service circuit including a first switch and a second switch, wherein the first switch is disposed corresponding to the up button such that the first switch is closed in response to the up button being pressed, and the second switch is disposed corresponding to the down button such that the second switch is closed in response to the down button being pressed;

the maintenance plug is provided with a plurality of pins, one end of the first switch is electrically connected with the first pin of the maintenance plug, and the other end of the first switch is electrically connected with the second pin of the maintenance plug; one end of the second switch is electrically connected with a third pin of the maintenance plug, and the other end of the second switch is electrically connected with a second pin of the maintenance plug.

Further, the overhaul loop further comprises a third switch and an interlocking unit, wherein one end of the third switch is electrically connected with the fourth pin of the overhaul plug, the other end of the third switch is electrically connected with one end of the interlocking unit, and the other end of the interlocking unit is electrically connected with the fifth pin of the overhaul plug;

the service device further comprises a common button, and the third switch is arranged corresponding to the common button, so that the third switch is closed in response to the common button being pressed; under the effect of the interlocking unit, when the first switch is closed, the second switch is opened, and when the second switch is closed, the first switch is opened.

Furthermore, the maintenance loop further comprises a fourth switch, one end of the fourth switch is electrically connected with a sixth pin of the maintenance plug, and the other end of the fourth switch is also electrically connected to a branch circuit of the interlocking unit connected with a fifth pin of the maintenance plug;

the service device further comprises an emergency stop button, and the fourth switch is arranged corresponding to the emergency stop button, so that the fourth switch is closed in response to the emergency stop button being pressed.

Further, the fifth terminal of the first security module is electrically connected to the seventh terminal of the first security module, and the seventh terminal is electrically connected to the second terminal of the second security module, and the second terminal is also electrically connected to the first terminal of the second security module.

Further, first safety circuit still includes first access cover, first access cover with first maintenance seat adaptation, first access cover has a plurality of pins, the first pin of first access cover and the second pin short circuit of self, the third pin of first access cover and the fourth pin short circuit of self, the fifth pin of first access cover and the sixth pin short circuit of self.

Further, the second safety circuit further comprises a second access cover, the second access cover is matched with the second access seat, the second access cover is provided with a plurality of pins, the first pin of the second access cover is in short circuit with the second pin of the second access cover, the third pin of the second access cover is in short circuit with the fourth pin of the second access cover, and the fifth pin of the second access cover is in short circuit with the sixth pin of the second access cover.

Further, the first safety circuit further includes a first auxiliary control unit, and the second terminal of the first safety module and the fourth terminal of the first safety module are electrically connected to the first auxiliary control unit, respectively.

Further, the second safety circuit further comprises a second auxiliary control unit, and the second auxiliary control unit is electrically connected with the second pin of the second maintenance seat and the third pin of the second maintenance seat respectively.

An escalator system comprising an escalator and a safety maintenance system as described above, the safety maintenance system being configured to perform safety maintenance on the escalator.

The utility model has the advantages that no matter in the upper machine room or the lower machine room, maintenance personnel can control the escalator to go up or down by the maintenance device according to the requirement, and meanwhile, the bypass maintenance needs to shield the detected safety switch signal; when the maintenance device is used, maintenance operation is realized by manual inching operation, namely the mode of combining the uplink button and the downlink button with the common button; moreover, the maintenance cover and the maintenance seat are separated to enter a maintenance state; in addition, an emergency stop button is further arranged, so that the safety of the emergency stop button during maintenance can be protected.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic wiring diagram of a safety maintenance circuit provided by an embodiment of the present invention;

fig. 2 is a schematic wiring diagram of an inspection plug provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an overhaul device provided by the embodiment of the present invention.

Wherein the reference numerals include: 1-a first safety circuit, 11-a first service seat, 12-a first access cover, 13-a first safety module, 14-a first auxiliary control unit, 2-a second safety circuit, 21-a second service seat, 22-a second access cover, 23-a second safety module, 24-a second auxiliary control unit, 3-a service device, 30-a service plug, 31-a lead, 32-a fastener, 33-a scram button, 34-an up button, 35-a common button, 36-a down button, 300-an interlock unit, 330-a fourth switch, 340-a first switch, 350-a third switch, 360-a second switch.

Detailed Description

In order to make the technical field person understand the present invention better, and to understand the objects, technical solutions and advantages thereof more clearly, the embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be noted that the implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, product, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

The utility model discloses an in an embodiment, a safety inspection system for automatic escalator is provided, this safety inspection system includes the safety inspection return circuit and the maintenance device that use of mutually supporting.

The safety maintenance circuit includes a first safety circuit 1 and a second safety circuit 2, and in the present embodiment, as shown in fig. 1, the first safety circuit 1 is provided in an upper machine room (control cabinet), and the second safety circuit 2 is provided in a lower machine room (control cabinet). As shown in fig. 1, the first safety circuit 1 includes a first service seat 11, a first access cover 12, a first safety module 13, and a first auxiliary control unit 14, the second safety circuit 2 includes a second service seat 21, a second access cover 22, a second safety module 23, and a second auxiliary control unit 24, the first service seat 11, the first access cover 12, the second service seat 21, and the second access cover 22 respectively include a plurality of pins, that is, a first pin, a second pin, and the like, which will be mentioned below, the first safety module 13 and the second safety module 23 respectively include a plurality of terminals, that is, a first terminal, a second terminal, and the like, which will be mentioned below, and the first access cover 12 is fitted to the first service seat 11, and the second access cover 22 is fitted to the second service seat 21. In this embodiment, first maintenance seat 11, first access cover 12, second maintenance seat 21, second access cover 22 and the maintenance plug 30 that mentions below all adopt 10 feet, but specific model and specific foot definition and use are confirmed according to the actual demand, do not injure with this the utility model discloses a protection scope, in addition, first maintenance seat 11 and second maintenance seat 21 can be waterproof heavy load maintenance socket, also can be the socket of other forms, do not injure with this yet the utility model discloses a protection scope.

For the first access cover 12, a short circuit board is designed in the first access cover 12, pin wiring is performed as shown in fig. 1, a first pin 1 of the first access cover is in short circuit with a second pin 6, so that the first safety loop 1 is conducted after the first access cover 12 is closed, and if the first access cover 12 is opened, the safety loop is disconnected, so that the access of the safety loop is realized by inserting the access device 3; meanwhile, a third pin of the socket 2 is short-circuited with a fourth pin of the socket 7 to be used for overhauling high levels of the uplink signal and the downlink signal, and no matter whether the overhauling device 3 is connected to an upper socket (in the embodiment, the upper socket is the first overhauling seat 11) or a lower socket (in the embodiment, the lower socket is the second overhauling seat 21), one high level is always supplied to the main control unit as uplink and downlink input, and if the upper socket and the lower socket are simultaneously inserted into the overhauling device 3, high level signals cannot be provided; meanwhile, a fifth pin of the escalator is in short circuit with a sixth pin of the escalator, namely 8 pins, once the first access cover 12 is closed, a high level passes through a loop of upper and lower access sockets and is input and judged to the main control unit as a normal high level, once an upper cover of the access socket of an upper machine room or a lower machine room (in the embodiment, the upper cover of the access socket refers to the first access cover 12 or the second access cover 22) is opened, the loop is in an open circuit state, and the main control unit judges that the escalator is in an access state at present; in addition, as shown in fig. 1, the 4 feet and the 5 feet of the first access cover 12 do not need to be short-circuited, and are used as input signals for overhauling the uplink and the downlink, and the 9 feet and the 10 feet of the first access cover 12 also do not need to be short-circuited, and are used as short-circuits of the bypass during the overhauling of the safety circuit.

The second access cover 22 is configured and wired in the same manner as the first access cover 12, which has been described in detail above, and will not be described herein again.

As shown in fig. 1, a first pin, i.e. a 4 pin, of the first service seat 11 is electrically connected with a first terminal of the first safety module 13, i.e. a 5 th position of the JU8 group, and a 5 th position of the JU8 group is also electrically connected with a second terminal of the first safety module 13, i.e. a 6 th position of the JU2 group, and a 6 th position of the JU2 group is electrically connected to an external escalator to send an uplink signal to the external escalator, and meanwhile, a 6 th position of the JU2 group is also electrically connected with a 1 st position of the JU9 group; a second pin, namely a pin 5, of the first service seat 11 is electrically connected with a third terminal of the first safety module 13, namely a position 4 of the JU8 group, the position 4 of the JU8 group is also electrically connected with a fourth terminal of the first safety module 13, namely a position 14 of the JU2 group, the position 14 of the JU2 group is electrically connected with an external escalator to send a downlink signal to the external escalator, and meanwhile, the position 14 of the JU2 group is also electrically connected with a position 2 of the JU9 group; in addition, the position No. 1 of the group JU9 and the position No. 2 of the group JU9 are electrically connected to the first auxiliary control unit 14, respectively, so that the maintenance worker controls the transmission of the uplink and downlink signals through the upper actuating key switch.

As shown in fig. 1, the third leg, i.e., leg 7, of the first service seat 11 is electrically connected to the fifth terminal of the first safety module 13, i.e., position No. 2 of group JU8, and position No. 2 of group JU8 is also electrically connected to the first terminal of the second safety module 23, i.e., position No. 2 of group JL4, through position No. 15 of group JU3 and position No. 15 of group JL5, and position No. 2 of group JL4 is also electrically connected to the first leg, i.e., leg 7, of the second service seat 21; the 4 feet of the second service seat 21 are electrically connected with the 5 th position of the JL4 group of the second safety module 23, the 5 feet of the second service seat 21 are electrically connected with the 4 th position of the JL4 group of the second safety module 23, meanwhile, the 5 th position of the JL4 group is also electrically connected with the second auxiliary control unit 24 through the 1 st position of the JL3 group of the second safety module 23, and the 4 th position of the JL4 group is also electrically connected with the second auxiliary control unit 24 through the 2 nd position of the JL3 group of the second safety module 23, so that a maintenance worker controls the transmission of uplink and downlink signals through a lower start key switch.

As shown in fig. 3, the service device 3 includes a service plug 30, a lead 31, a fastener 32, an emergency stop button 33, an up button 34, a common button 35, and a down button 36. The service plug 30 has a plurality of pins, i.e. a first pin, a second pin, etc. mentioned below, the service plug 30 is connected to one end of a lead 31, the other end of the lead 31 is connected to a fastener 32, in this embodiment, the lead 31 can be selected from a cable (6 x 0.75 mm) ² ) However, the specific model is determined according to actual requirements, and the protection scope of the present invention is not limited thereby. The up button 34 is configured to transmit an up signal and the down button 36 is configured to transmit a down signal.

The service plug 30 is adapted to the first service seat 11, so that when the service plug 30 is connected to the first service seat 11, and in combination with the service loop of the service device 3, the service device 3 can send an uplink signal to the external escalator through the 6 th position of the JU2 group, and send a downlink signal to the external escalator through the 14 th position of the JU2 group, and send an emergency stop signal to the external escalator, thereby realizing safe service work.

Specifically, as shown in fig. 2, the service circuit includes a first switch 340, a second switch 360, a third switch 350, a fourth switch 330, and an interlock unit 300, wherein one end of the first switch 340 is electrically connected to a first pin, i.e., 4-pin, of the service plug 30, the other end of the first switch 340 is electrically connected to a second pin, i.e., 7-pin, of the service plug 30, and the first switch 340 is disposed corresponding to the up button 34, so that the first switch 340 is closed in response to the up button 34 being pressed; one end of the second switch 360 is electrically connected to the third pin, i.e., the 5-pin, of the service plug 30, the other end of the second switch 360 is electrically connected to the 7-pin of the service plug 30, and the second switch 360 is disposed corresponding to the down button 36, so that the second switch 360 is closed in response to the down button 36 being pressed; one end of the third switch 350 is electrically connected to the fourth pin, i.e., pin 10, of the service plug 30, the other end of the third switch 350 is electrically connected to one end of the interlock unit 300, the other end of the interlock unit 300 is electrically connected to the fifth pin of the service plug 30, and the third switch 350 is disposed corresponding to the common button 35, such that in response to the common button 35 being pressed, the third switch 350 is closed, and when the first switch 340 is closed by the interlock unit 300, the second switch 360 is opened, and when the second switch 360 is closed, the first switch 340 is opened; one end of the fourth switch 330 is electrically connected to the sixth pin, pin 1, of the service plug 30, the other end of the fourth switch 330 is also electrically connected to a branch of the interlock unit 300 connected to the fifth pin, pin 9, of the service plug 30, and the fourth switch 330 is disposed corresponding to the emergency stop button 33 such that the fourth switch 330 is closed in response to the emergency stop button 33 being pressed.

It should be noted that, when the maintenance personnel performs the up and down going detection through the maintenance device 3, for example, when the escalator needs to be detected to go up, the maintenance personnel needs to press the up going button 34 and the common button 35 at the same time, so that the advantage of this arrangement is to prevent the wrong touch, and the down going operation is the same as the up going operation.

In an embodiment of the present invention, there is provided an escalator system, comprising an escalator and a safety maintenance system as described above, the safety maintenance system being configured to perform safety maintenance on the escalator.

The idea of this staircase system embodiment belongs to same idea with the working process of safety maintenance system in above-mentioned embodiment, incorporates this staircase system embodiment with the whole content of above-mentioned safety maintenance system embodiment through the mode that cites in full text, no longer explains repeatedly.

The utility model discloses a purpose is based on the position of foot that the switch board overhauld socket-outlet base and upper cover, combines that switch board safety, maintenance return circuit and maintenance device circuit are ingenious to combine together to design out the normal return circuit of whole staircase system and to overhaul the circuit. Whether the escalator is in an upper machine room or a lower machine room, maintenance personnel can use the maintenance device to control the escalator to go up or down according to requirements, and meanwhile, safety switch signals required by shielding detection are required for bypass maintenance; when the upper machine room overhauling device and the lower machine room overhauling device are inserted into the control cabinet to overhaul the socket, the safety switch signal for shielding detection is not overhauled, and the safety circuit can be switched on by pressing the public button at the same time. When the maintenance device is used, the maintenance operation is realized by the inching operation of two hands and the combination of the up and down movement and the common button, and the maintenance socket of the control cabinet enters a maintenance state as long as the socket is opened; the emergency stop button of the maintenance device is used for safety protection during maintenance.

The utility model discloses utilize and overhaul the socket cooperation on overhauing the device and going up and down the computer lab control box and use, thereby control automatic escalator up-and-down, and utilize and overhaul the device, upper and lower computer lab overhauls socket, switch board three cooperation and builds the return circuit, make it when controlling the operation, computer lab part safety circuit about the direct bypass, the scram button cluster that will overhaul the device goes into safety circuit, can utilize and overhaul the device and cut off safety circuit, make automatic escalator unable operation. Specifically in circuit design, under the closed condition of normal maintenance apron, safety circuit overhauls the short circuit of socket 1 and 6 feet from top to bottom, the route of safety circuit has been realized, when needs access overhaul device, one of them group of socket that overhauls of upper and lower computer lab must be opened, safety circuit disconnection this moment, overhaul the device public and stop to connect the foot position 1 of this socket respectively, 9, 10, cooperate with 1 and 6 short circuits of another group of overhaul socket, need shield the safety switch who detects when the computer lab overhauls about as the bypass. And, the utility model discloses still carried out rational planning to overhauing the socket foot position, the upper cover that upper and lower computer lab overhauld the socket can carry out the short circuit of foot position as required by the circuit, because the short circuit of upper cover foot position, the contact pin of upper cover inserts behind the socket (overhauls the upper cover and close and overhaul the base) and represent the normal condition of the passageway of overhauing safety circuit from top to bottom, the normal high level passageway input of computer lab about the short circuit also can be regarded as is gathered, it opens to overhaul the socket upper cover, then safety circuit all is in the state of opening circuit with overhauing high level feedback, get into to overhaul the operation.

The utility model realizes the opening of the overhaul socket and the insertion of the overhaul device by skillful planning of the overhaul socket feet and combining with the circuit design of the control cabinet safety, the overhaul loop and the overhaul device, when one group of overhaul sockets in the upper machine room and the lower machine room are opened, the overhaul device is connected and enters the overhaul state, the uplink and downlink high-level signals are introduced by another overhaul socket closed on the upper cover, so that the uplink and downlink high-level trigger signals are successfully transmitted to the main control unit of the control cabinet to carry out the overhaul operation, if the overhaul sockets in the upper machine room and the lower machine room are opened simultaneously, the high-level signals are in the state of the open circuit of the upper machine room and the lower machine room, the overhaul operation can not be realized, and when one group of the overhaul sockets in the upper machine room and the lower machine room is opened, the overhaul device is connected and enters the overhaul state, the overhaul socket closed on the upper cover and the other group of overhaul sockets form the safety loop of the bypass overhaul shielding relevant safety switches, the on-site maintenance personnel can conveniently troubleshoot and solve the fault. Furthermore, during actual operation, overhaul the device and must open the upper cover that one of them overhauld the socket and connect, then use both hands to operate (during the maintenance state, the safety circuit bypass switches on and needs to press the public button of overhauing the device, overhaul simultaneously up, down high level signal need trigger overhaul the device go up, down one of them button), for preventing that one of them button from becoming invalid and leading to the incident, this overhauls the device and has still been equipped with safe scram button, can effectively cut off the safety circuit when public and up-down button are invalid simultaneously, it is safer.

The above mentioned is only the preferred embodiment of the present invention, not the limitation of the patent scope, all the equivalent structures or equivalent processes that the contents of the specification and the drawings are utilized are directly or indirectly applied to other related technical fields, and all the same principles are included in the patent protection scope of the present invention.

Claims (10)

1. A safety maintenance system for an escalator, which is characterized by comprising a safety maintenance loop and a maintenance device which are matched with each other, wherein the safety maintenance loop comprises a first safety loop (1) and a second safety loop (2), the first safety loop (1) comprises a first maintenance seat (11) and a first safety module (13), the second safety loop (2) comprises a second maintenance seat (21) and a second safety module (23), the first maintenance seat (11) and the second maintenance seat (21) respectively comprise a plurality of pins, and the first safety module (13) and the second safety module (23) respectively comprise a plurality of terminals; the first pin of the first service seat (11) is electrically connected with the first terminal of the first safety module (13), the first terminal is also electrically connected with the second terminal of the first safety module (13), and the second terminal of the first safety module (13) is electrically connected with an external escalator; the second pin of the first service seat (11) is electrically connected with the third terminal of the first safety module (13), the third terminal is also electrically connected with the fourth terminal of the first safety module (13), and the fourth terminal of the first safety module (13) is electrically connected with an external escalator; a third pin of the first maintenance seat (11) is electrically connected with a fifth terminal of the first safety module (13), the fifth terminal is also electrically connected with a first terminal of the second safety module (23), and a first terminal of the second safety module (23) is also electrically connected with a first pin of the second maintenance seat (21);

the service device (3) comprises a service plug (30), an uplink button (34) and a downlink button (36), the uplink button (34) is configured to transmit an uplink signal, the downlink button (36) is configured to transmit a downlink signal, the service plug (30) is adapted to the first service seat (11), so that when the service plug (30) is connected to the first service seat (11), the service device (3) is configured to transmit the uplink signal to the external escalator through the second terminal of the first safety module (13) and transmit the downlink signal to the external escalator through the fourth terminal of the first safety module (13).

2. The safety service system of claim 1, wherein the service device (3) has a service circuit including a first switch (340) and a second switch (360), wherein the first switch (340) is disposed in correspondence with the up button (34) such that the first switch (340) is closed in response to the up button (34) being pressed, and the second switch (360) is disposed in correspondence with the down button (36) such that the second switch (360) is closed in response to the down button (36) being pressed;

the maintenance plug (30) is provided with a plurality of pins, one end of the first switch (340) is electrically connected with the first pin of the maintenance plug (30), and the other end of the first switch (340) is electrically connected with the second pin of the maintenance plug (30); one end of the second switch (360) is electrically connected with a third pin of the maintenance plug (30), and the other end of the second switch (360) is electrically connected with a second pin of the maintenance plug (30).

3. The safety service system of claim 2, wherein the service circuit further comprises a third switch (350) and an interlock unit (300), wherein one end of the third switch (350) is electrically connected to the fourth pin of the service plug (30), the other end of the third switch (350) is electrically connected to one end of the interlock unit (300), and the other end of the interlock unit (300) is electrically connected to the fifth pin of the service plug (30);

the service device (3) further comprises a common button (35), the third switch (350) being arranged in correspondence with the common button (35) such that the third switch (350) is closed in response to the common button (35) being pressed; when the first switch (340) is closed, the second switch (360) is opened, and when the second switch (360) is closed, the first switch (340) is opened under the action of the interlock unit (300).

4. The safety service system of claim 3, wherein the service circuit further comprises a fourth switch (330), one end of the fourth switch (330) is electrically connected with the sixth pin of the service plug (30), and the other end of the fourth switch (330) is also electrically connected to a branch of the interlock unit (300) connected with the fifth pin of the service plug (30);

the service device (3) further comprises an emergency stop button (33), and the fourth switch (330) is arranged corresponding to the emergency stop button (33), so that the fourth switch (330) is closed in response to the emergency stop button (33) being pressed.

5. The safety-access system according to claim 1, characterized in that the fifth terminal of the first safety module (13) is electrically connected to the seventh terminal of the first safety module (13) and the seventh terminal is electrically connected to the second terminal of the second safety module (23), and the second terminal is also electrically connected to the first terminal of the second safety module (23).

6. The safety maintenance system according to claim 1, characterized in that the first safety circuit (1) further comprises a first access cover (12), the first access cover (12) being adapted to the first maintenance seat (11), the first access cover (12) having a plurality of pins, the first pin of the first access cover (12) being short-circuited with a second pin of its own, the third pin of the first access cover (12) being short-circuited with a fourth pin of its own, the fifth pin of the first access cover (12) being short-circuited with a sixth pin of its own.

7. The safety maintenance system according to claim 1, characterized in that the second safety circuit (2) further comprises a second access cover (22), the second access cover (22) being adapted to the second service seat (21), the second access cover (22) having a plurality of pins, a first pin of the second access cover (22) being short-circuited with a second pin of its own, a third pin of the second access cover (22) being short-circuited with a fourth pin of its own, a fifth pin of the second access cover (22) being short-circuited with a sixth pin of its own.

8. The safety-service system according to claim 1, characterized in that the first safety circuit (1) further comprises a first auxiliary control unit (14), the second terminal of the first safety module (13) and the fourth terminal of the first safety module (13) being electrically connected to the first auxiliary control unit (14), respectively.

9. The safety maintenance system according to claim 1, characterized in that the second safety circuit (2) further comprises a second auxiliary control unit (24), the second auxiliary control unit (24) being electrically connected to the second pin of the second maintenance seat (21) and the third pin of the second maintenance seat (21), respectively.

10. An escalator system, characterized in that it comprises an escalator and a safety service system according to any one of claims 1-9, which is configured to perform safety service on the escalator.

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