Rail detection device for lifting bodies

Abstract

To obtain a derailment detection device for an elevating body capable of detecting that an elevating body 3b comes off from a guide rail 4b at an early stage.SOLUTION: A derailment detection device for an elevating body includes a photoelectric sensor 9 provided on an elevating body 3b raising / lowering along a guide rail 4b and having a first light emitting part 11b emitting a first light and a first light receiving part 12b receiving the first light, a wire 8 provided in parallel with the elevating direction of the elevating body 3b and arranged at a position where the first light receiving part 12b is blocked from receiving the first light between the first light emitting part 11b and the first light receiving part 12b, and a detection part for detecting that the elevating body 3b comes off from the guide rail 4b. The first light receiving part 12b receives the first light by moving the photoelectric sensor 9 such that the wire 8 comes off from the position. The detection part detects that the elevating body 3b comes off from the guide rail 4b when the first light receiving part 12b receives the first light.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a rail detachment detection device for an elevator. [Background technology]

[0002] A conventional rail detachment detection device for an elevating body includes a bracket installed in a partial area of ​​the entire length of the elevator shaft and a detector for detecting when the elevating body has detached from the guide rail. The two brackets are fixed to each guide rail, spaced apart from each other in the vertical direction. A light-emitting unit is fixed to one bracket, and a light-receiving unit is fixed to the other bracket. The light-emitting unit emits light toward the light-receiving unit, which detects whether or not the light is present. The detector detects that the elevating body has detached from the guide rail when the light-emitting unit blocks the light and the light-receiving unit does not detect the light (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-051604 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional rail derailment detection device for an elevated body, the brackets are provided in a partial area of ​​the entire length of the elevator shaft. Therefore, if the elevated body deviates from the guide rail at a location where no brackets are provided, it is not possible to detect that the elevated body has deviated from the guide rail until the elevated body moves to a location where a bracket is provided, resulting in a problem of delayed detection.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a rail-detachment detection device for an elevator body that can detect early on when the elevator body has come off the guide rail. [Means for solving the problem]

[0006] The rail detachment detection device for a lifting body disclosed herein comprises a photoelectric sensor provided on a lifting body that moves up and down along a guide rail, the photoelectric sensor having a first light-emitting unit that emits first light and a first light-receiving unit that receives the first light, a wire that is provided parallel to the lifting direction of the lifting body and is located between the first light-emitting unit and the first light-receiving unit in a position that blocks the first light-receiving unit from receiving the first light, and a detection unit that detects when the lifting body has come off the guide rail; when the photoelectric sensor moves so that the wire moves out of position, the first light-receiving unit receives the first light, and the detection unit detects that the lifting body has come off the guide rail. The rail detachment detection device for a lifting body disclosed herein is provided on a lifting body that moves up and down along a guide rail, and includes a photoelectric sensor that is provided at a position where the guide rail blocks the light-receiving unit from receiving light, a detection unit that detects when the lifting body has detached from the guide rail, and a light-emitting control unit that controls the light-emitting unit.When the photoelectric sensor moves from its position, the light-receiving unit receives light, and the detection unit detects that the lifting body has detached from the guide rail when the light-receiving unit receives light, and the light-emitting control unit controls the light-emitting unit to stop emitting light.When the detection unit receives a signal from the light-receiving unit that it has received light, the detection unit detects that the light-receiving unit is in a short-circuit state. The rail derailment detection device for an elevator body according to the present disclosure includes a photoelectric sensor provided on an elevator body that moves up and down along a guide rail, the photoelectric sensor having a first light-emitting unit that emits first light, a first light-receiving unit that receives the first light, and a second light-emitting unit that emits second light, and a second light-receiving unit that receives the second light, the photoelectric sensor being attached at a position where the guide rail blocks the first light from being received by the first light-receiving unit and where the guide rail blocks the second light from being received by the second light-receiving unit; and a detection unit that detects when the lifting body has come off the guide rail, and when the photoelectric sensor moves from a position, the first light-receiving unit receives a first light and the second light-receiving unit receives a second light, and the detection unit detects that the lifting body has come off the guide rail when the first light-receiving unit receives the first light, and detects that the first light-receiving unit is in a disconnected state when the detection unit does not receive a signal from the first light-receiving unit indicating that the first light has been received and the second light-receiving unit receives the second light. [Effects of the Invention]

[0007] According to the rail detachment detection device for an elevator body according to the present disclosure, it is possible to detect early on that an elevator body has detached from a guide rail. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram of an elevator system including a rail detachment detection device for a lifting body according to a first embodiment. [Figure 2] FIG. 2 is a side view of the counterweight and the photoelectric sensor according to the first embodiment. [Figure 3] FIG. 2 is a plan view of a counterweight and a photoelectric sensor according to the first embodiment. [Figure 4] 1 is a configuration diagram of a rail detachment detection device for an ascending / descending body in the first embodiment. [Figure 5] FIG. 4 is a diagram showing a reception pattern of a detection unit in the first embodiment. [Figure 6] 4 is a plan view of the counterweight and the photoelectric sensor when the counterweight has come off the counterweight guide rail in the first embodiment. FIG. [Figure 7]4 is a plan view of the counterweight and the photoelectric sensor when the counterweight has come off the counterweight guide rail in the first embodiment. FIG. [Figure 8] 4 is a plan view of the counterweight and the photoelectric sensor when the counterweight has come off the counterweight guide rail in the first embodiment. FIG. [Figure 9] 4 is a flowchart showing the processing of a control unit in the first embodiment. [Figure 10] FIG. 10 is a side view of a counterweight and a photoelectric sensor according to the second embodiment. [Figure 11] FIG. 10 is a plan view of a counterweight and a photoelectric sensor according to a second embodiment. [Figure 12] 10 is an enlarged plan view of a counterweight and a photoelectric sensor according to a second embodiment. FIG. [Figure 13] FIG. 10 is a diagram showing a reception pattern of a detection unit in the second embodiment. [Figure 14] 10 is an enlarged plan view of the counterweight and the photoelectric sensor when the counterweight has come off the counterweight guide rail in the second embodiment. FIG. [Figure 15] FIG. 10 is a plan view of a counterweight and a photoelectric sensor showing a modified example of the second embodiment. [Figure 16] 3 is a diagram illustrating a configuration example of a processing circuit of a control unit according to the first embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 Hereinafter, a detailed description will be given of an elevator system equipped with a rail derailment detection device for an ascending or descending body according to embodiment 1. Note that the same reference numerals in the various drawings represent the same or equivalent components.

[0010] As shown in FIG. 1, the elevator system includes a lifting body, guide rails, a hoist 5, a deflector sheave 6, a suspension body 7, and a rail-detachment detection device for the lifting body. A machine room 2 is provided above the hoistway 1. A car 3a and a counterweight 3b of the lifting body are provided within the hoistway 1. In the following description, unless the car 3a and the counterweight 3b are distinguished, they will be referred to as the lifting body 3. Furthermore, within the hoistway 1 are provided guide rails, namely, a car guide rail 4a and a counterweight guide rail 4b. In the following description, unless the car guide rail 4a and the counterweight guide rail 4b are distinguished, they will be referred to as guide rails 4. The car 3a moves up and down within the hoistway 1 along the car guide rail 4a. The counterweight 3b moves up and down within the hoistway 1 along the counterweight guide rail 4b.

[0011] FIG. 2 shows a side view of the counterweight 3b and a photoelectric sensor 9, which will be described later. As shown in FIG. 2, a pair of upper guide shoes 3ba and a pair of lower guide shoes 3bb are attached to the counterweight 3b. The pair of upper guide shoes 3ba are attached to both sides of the upper part of the counterweight 3b. The pair of lower guide shoes 3bb are attached to both sides of the lower part of the counterweight 3b. The pair of upper guide shoes 3ba and the pair of lower guide shoes 3bb slide along the counterweight guide rails 4b, guiding the counterweight 3b as it moves up and down. Note that the suspension body 7 is not shown in FIG. 2 and in FIGS. 3 and 6 to 8, which will be described below.

[0012] As shown in FIG. 1, a hoisting machine 5 and a deflector sheave 6 are provided in the machine room 2. The hoisting machine 5 has a drive sheave 5a and a motor (not shown), which rotates the drive sheave 5a. A suspension body 7 is wound around the drive sheave 5a and the deflector sheave 6. A car 3a is connected to one end of the suspension body 7, and a counterweight 3b is connected to the other end of the suspension body 7. The lifting body 3 moves up and down in the hoistway 1 as the drive sheave 5a rotates.

[0013] The rail-detachment detection device for the elevator body includes a wire 8, a photoelectric sensor 9, a control device 10, a switch 14, and an alarm 15. As shown in FIG. 1 , the wire 8 is provided in the elevator shaft 1 and is arranged parallel to the vertical direction of the elevator body 3. The wire 8 is also arranged in a position such that, when the counterweight 3b has not come off the counterweight guide rail, the wire 8 blocks the light receiving unit 12b (described later) from receiving light B (described later), does not block the light receiving unit 12a (described later) from receiving light A (described later), and does not block the light receiving unit 12c (described later) from receiving light C (described later). This position is referred to as the initial position. One end of the wire 8 is fixed to the ceiling of the elevator shaft 1, and the other end of the wire 8 is fixed to the floor of the elevator shaft 1.

[0014] In the following description, the direction perpendicular to the ascending / descending direction of the ascending / descending body 3 is referred to as the horizontal direction. Within the horizontal direction, the direction parallel to the direction from one side of the counterweight guide rail 4b to the other side is referred to as the depth direction. Furthermore, within the horizontal direction, the direction parallel to the direction perpendicular to the depth direction is referred to as the left-right direction.

[0015] As shown in FIG. 2, the photoelectric sensor 9 is provided on the counterweight 3b. Specifically, the photoelectric sensor 9 is attached to the center of the upper end of the counterweight 3b. FIG. 3 shows a plan view of the counterweight 3b and the photoelectric sensor 9. As shown in FIG. 3, the photoelectric sensor 9 is formed in a U-shape. The photoelectric sensor 9 has a light-emitting unit 11b, which is a first light-emitting unit, and a light-receiving unit 12b, which is a first light-receiving unit. The photoelectric sensor 9 also has a light-emitting unit 11a, which is a second light-emitting unit, a light-emitting unit 11c, which is a third light-emitting unit, a light-receiving unit 12a, which is a second light-receiving unit, and a light-receiving unit 12c, which is a third light-receiving unit. Note that the third light-emitting unit may be the light-emitting unit 11a and the third light-receiving unit may be the light-receiving unit 12a. In this case, the second light-emitting unit is the light-emitting unit 11c and the second light-receiving unit is the light-receiving unit 12c.

[0016] In the following description, when there is no need to distinguish between light-emitting units 11a, 11b, and 11c, they will be referred to as light-emitting unit 11. Furthermore, in the following description, when there is no need to distinguish between light-receiving units 12a, 12b, and 12c, they will be referred to as light-receiving unit 12.

[0017] The light-emitting unit 11 has a light-emitting element such as a laser diode or a light-emitting diode. The light-receiving unit 12 has a light-receiving element such as a phototransistor. The light-emitting unit 11a is arranged facing the light-receiving unit 12a in the depth direction, the light-emitting unit 11b is arranged facing the light-receiving unit 12b in the depth direction, and the light-emitting unit 11c is arranged facing the light-receiving unit 12c in the depth direction. The light-emitting unit 11b emits light B, which is a first light, and the light-receiving unit 12b receives light B. The light-emitting unit 11a emits light A, which is one of the second light and the third light, and the light-receiving unit 12a receives light A. The light-emitting unit 11c emits light C, which is the other of the second light and the third light, and the light-receiving unit 12c receives light C.

[0018] The light-emitting units 11a and 11c and the light-receiving units 12a and 12c are arranged so that the optical path of light B is between the optical paths of light A and light C in a plan view. Specifically, the light-emitting unit 11b is arranged between the light-emitting unit 11a and the light-emitting unit 11c, and the light-receiving unit 12b is arranged between the light-receiving unit 12a and the light-receiving unit 12c. In this case, the optical paths of light A, B, and C are parallel to the depth direction. In the following description, when light A, B, and C are not distinguished from one another, they will be referred to as light. The optical path refers to the path traveled by light irradiated from the light-emitting unit 11 before being received by the light-receiving unit 12.

[0019] When the light receiving unit 12 receives light irradiated from the light emitting unit 11, it outputs a light receiving signal, which is an electrical signal indicating that light has been received, to the detecting unit 13b described later via an input / output interface (not shown).

[0020] 1, the control device 10 is provided in the machine room 2. Furthermore, as shown in FIG.

[0021] The control unit 13 is a device such as a control board configured with a processor including a semiconductor integrated circuit, a memory, and an input / output interface, and controls the entire elevator system. The control unit 13 includes a light emission control unit 13a, a detection unit 13b, and a car control unit 13c. An example of the configuration of the processing circuit of the control unit 13 will be described later.

[0022] The light emission control unit 13 a includes a software module that controls the light emission unit 11 .

[0023] The detector 13b includes a software module that detects that the counterweight 3b has come off the counterweight guide rail 4b based on the light receiving signal output from the light receiving unit 12. The detector 13b also includes a software module that outputs an operation stop signal to the car controller 13c. The operation stop signal is an electrical signal that stops the operation of the lifting body 3.

[0024] The detector 13b includes a software module that detects whether the light-receiving unit 12b is in a short-circuit state or an open-circuit state based on the light-receiving signal output from the light-receiving unit 12. The short-circuit state of the light-receiving unit 12b specifically refers to a state in which the emitter terminal and collector terminal of the light-receiving element of the light-receiving unit 12b are short-circuited. The open-circuit state of the light-receiving unit 12b specifically refers to a state in which the emitter terminal and collector terminal of the light-receiving element of the light-receiving unit 12b are not electrically connected.

[0025] Furthermore, the detection unit 13b includes a software module that outputs a rail-off detection signal, a short-circuit detection signal, and a wire-opening detection signal to the alarm 15, which will be described later. The rail-off detection signal is an electrical signal that indicates that the counterweight 3b has been detected as having come off the rail. The short-circuit detection signal is an electrical signal that indicates that a short-circuit state of the light-receiving unit 12b has been detected. The wire-opening detection signal is an electrical signal that indicates that a wire-opening state of the light-receiving unit 12b has been detected.

[0026] The car control unit 13c includes a software module that controls the operation of the lifting body 3 by controlling the hoisting machine 5.

[0027] The switch 14 is a device that is pressed by a worker when the worker repairs the counterweight 3b coming off the rail, the short circuit state of the light receiving unit 12b, or the open circuit state of the light receiving unit 12b. When the worker presses the switch 14, the switch 14 outputs an operation stop release signal to the car control unit 13c. The counterweight 3b coming off the rail refers to the counterweight 3b coming off the counterweight guide rail 4b. The operation stop release signal is an electrical signal that indicates that the operation of the lifting body 3 is to be released.

[0028] The alarm 15 is a device that notifies elevator system workers and the like. For example, it is an information terminal of a management company that manages the elevator system, an information center of an elevator system maintenance company, or a portable information terminal carried by a worker who maintains and repairs the elevator system. The alarm 15 may also be a lamp provided in the control device 10.

[0029] Next, we will explain the mechanism by which the detector 13b detects that the counterweight 3b has come off the counterweight guide rail 4b based on the light-receiving signal output from the light-receiving unit 12. First, we will explain the reception pattern of the light-receiving signal received by the detector 13b using Figure 5. The reception pattern refers to a combination of whether or not the light-receiving signals output from the light-receiving units 12a, b, and c are received.

[0030] 5 is a diagram showing a reception pattern of a light receiving signal received by the detecting unit 13b. In FIG. 5, "ON" written in the column direction of "light receiving unit 12a," "light receiving unit 12b," and "light receiving unit 12c" indicates that the detecting unit 13b has received a light receiving signal from the light receiving unit 12, and "OFF" indicates that the detecting unit 13b has not received a light receiving signal from the light receiving unit 12.

[0031] There are six reception patterns for the detector 13b. The first is a first reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12a and 12c but does not receive a light reception signal from the light receiving unit 12b. The second is a second reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12b and 12c but does not receive a light reception signal from the light receiving unit 12a. The third is a third reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12a and 12b but does not receive a light reception signal from the light receiving unit 12c. The fourth is a fourth reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12a, 12b, and 12c. The fifth is a fifth reception pattern in which the detector 13b receives a light reception signal from the light receiving unit 12c but does not receive a light reception signal from the light receiving units 12a and 12b. The sixth reception pattern is one in which the detector 13b receives a light reception signal from the light receiver 12a but does not receive a light reception signal from the light receivers 12b and 12c.

[0032] Next, we will explain the output of the light receiving signal from the light receiving unit 12 when the counterweight 3b has not come off the counterweight guide rail 4b, and the reception pattern of the detection unit 13b at this time. As shown in FIG. 3, when the counterweight 3b has not come off the counterweight guide rail 4b, the wire 8 is positioned in the initial position. Therefore, the light receiving units 12a and 12c receive light A and C, but the light receiving unit 12b is blocked from receiving light B by the wire 8. Therefore, the light receiving units 12a and 12c output light receiving signals, but the light receiving unit 12b does not output a light receiving signal. At this time, the detection unit 13b receives the light receiving signal in the first pattern.

[0033] Next, we will explain the output of the light receiving signal from the light receiving unit 12 when the counterweight 3b comes off the counterweight guide rail 4b, and the reception pattern of the detection unit 13b at this time. As shown in FIG. 6, when the counterweight 3b comes off the counterweight guide rail 4b and moves away from the wire 8, the photoelectric sensor 9 moves so that the wire 8 moves away from its initial position. At this time, the photoelectric sensor 9 moves along with the movement of the counterweight 3b. Then, the light receiving units 12b and 12c receive light B and C. However, the wire 8 blocks the light receiving unit 12a from receiving light A. Therefore, the light receiving units 12b and 12c output light receiving signals, and the light receiving unit 12b does not output a light receiving signal. At this time, the detection unit 13b receives light receiving signals in the second pattern.

[0034] As shown in FIG. 7, when counterweight 3b moves away from counterweight guide rail 4b and approaches wire 8, photoelectric sensor 9 moves so that wire 8 moves away from its initial position. Light receiving units 12a and 12b then receive light A and light B. However, light receiving unit 12c is blocked from receiving light C by wire 8. Therefore, light receiving units 12a and 12b output light receiving signals, but light receiving unit 12c does not output a light receiving signal. At this time, detection unit 13b receives light receiving signals in the third pattern.

[0035] As shown in Figure 8, when counterweight 3b moves off counterweight guide rail 4b and rotates clockwise, photoelectric sensor 9 moves so that wire 8 moves away from its initial position. Then, light-receiving units 12a, b, and c receive light A, B, and C. Therefore, light-receiving units 12a, b, and c output light-receiving signals. At this time, detector 13b receives the light-receiving signal in the fourth pattern.

[0036] As described above, when the detector 13b receives a light receiving signal in the second, third, or fourth receiving pattern, it can detect that the counterweight 3b has come off the counterweight guide rail 4b. In other words, when the light receiving unit 12a or the light receiving unit 12c does not receive light A or C, or when the light receiving unit 12b receives light B, the detector 13b can detect that the counterweight 3b has come off the counterweight guide rail 4b.

[0037] Next, a mechanism will be described in which the detector 13b detects that the light-receiving unit 12b is in a short-circuit state based on the light-receiving signal output from the light-receiving unit 12. When the light-receiving unit 12b is in a short-circuit state, as shown in Fig. 6, when the counterweight 3b moves away from the counterweight guide rail 4b and away from the wire 8, the photoelectric sensor 9 moves so that the wire 8 moves away from its initial position. Then, the light-receiving units 12b and 12c receive light B and C, and the light-receiving unit 12a is blocked from receiving light A by the wire 8.

[0038] Here, when light-receiving unit 12b is in a short-circuit state, light-receiving unit 12b outputs a light-receiving signal regardless of whether light B is received. In other words, even if light-emitting unit 11b stops emitting light B, light-receiving unit 12 outputs a light-receiving signal. Therefore, when light-emitting unit 11b stops emitting light B and detection unit 13b receives a light-receiving signal in the second reception pattern, detection unit 13b can detect that light-receiving unit 12b is in a short-circuit state. In other words, when light-emission control unit 13a controls light-emitting unit 11b to stop emitting light B and detection unit 13b receives a light-receiving signal from light-receiving unit 12b, detection unit 13b can detect that light-receiving unit 12b is in a short-circuit state.

[0039] In addition, as shown in Figure 7, when the counterweight 3b comes off the counterweight guide rail 4b so as to approach the wire 8, or as shown in Figure 8, when the counterweight 3b comes off the counterweight guide rail 4b so as to rotate clockwise, if the emission of light B from the light-emitting unit 11b is stopped and the detecting unit 13b receives a light-receiving signal in the third receiving pattern or the fourth receiving pattern, the detecting unit 13b can detect that the light-receiving unit 12b is in a short-circuit state, as described above.

[0040] Next, a description will be given of the mechanism by which the detector 13b detects that the light-receiving unit 12b is in a disconnected state based on the light-receiving signal output from the light-receiving unit 12. When the light-receiving unit 12b is in a disconnected state, as shown in Fig. 6, when the counterweight 3b moves away from the counterweight guide rail 4b and away from the wire 8, the photoelectric sensor 9 moves so that the wire 8 moves away from its initial position. Then, the light-receiving units 12b and 12c receive light B and C, and the light-receiving unit 12a is blocked from receiving light A by the wire 8.

[0041] Here, when light receiving unit 12b is in a disconnection state, light receiving unit 12b does not output a light reception signal regardless of whether light B is received. In other words, even if light emitter 11b is irradiating light B, light receiving unit 12b does not output a light reception signal. Therefore, when detector 13b receives a light reception signal in the fifth reception pattern, detector 13b can detect that light receiving unit 12b is in a disconnection state. In other words, when detector 13b does not receive a light reception signal from light receiving unit 12b and light receiving unit 12a does not receive light A, detector 13b can detect that light receiving unit 12b is in a disconnection state.

[0042] 7, when the counterweight 3b moves away from the counterweight guide rail 4b so as to approach the wire 8, the detector 13b can detect that the light-receiving unit 12b is in a disconnected state when the detector 13b receives a light-receiving signal in the sixth receiving pattern, similar to the above. In other words, the detector 13b can detect that the light-receiving unit 12b is in a disconnected state when the detector 13b does not receive a light-receiving signal from the light-receiving unit 12b and the light-receiving unit 12c does not receive the light C.

[0043] Furthermore, when the detecting unit 13b does not receive a light receiving signal from either the light receiving unit 12a or the light receiving unit 12c, it can be determined that the movement of the photoelectric sensor 9 has caused the wire 8 to block the light receiving unit 12a or the light receiving unit 12c from receiving the light A or C. Therefore, when the detecting unit 13b receives a light receiving signal in the fifth or sixth receiving pattern, it can also simultaneously detect that the counterweight 3b has come off the counterweight guide rail 4b.

[0044] Next, the operation of this embodiment will be described with reference to a flowchart of FIG.

[0045] In step S1, the detector 13b detects that the counterweight 3b has come off the counterweight guide rail 4b based on the light-receiving signal output from the light-receiving unit 12. Specifically, the detector 13b receives the light-receiving signal output by the light-receiving unit 12. When the detector 13b receives the light-receiving signal in the first receiving pattern, the detector 13b does not detect that the counterweight 3b has come off the counterweight guide rail 4b, and repeats step S1. On the other hand, when the detector 13b does not receive the light-receiving signal in the first receiving pattern, that is, when the detector 13b receives the light-receiving signal in any one of the second to sixth receiving patterns, the detector 13b detects that the counterweight 3b has come off the counterweight guide rail 4b, and the process proceeds to step S2.

[0046] In step S2, the detection unit 13b outputs an operation stop signal to the car control unit 13c. When the detection unit 13b outputs the operation stop signal to the car control unit 13c, the car control unit 13c controls the hoisting machine 5 to stop the operation of the lifting body 3. This prevents the counterweight 3b from moving up and down in the hoistway 1 in a state where it is off the counterweight guide rail 4b.

[0047] In step S3, the detector 13b outputs a rail detachment detection signal to the alarm 15. The alarm 15 notifies an elevator worker or the like that the counterweight 3b has detached from the counterweight guide rail 4b.

[0048] In step S4, the detector 13b detects that the light-receiving unit 12b is in a disconnection state based on the light-receiving signal output from the light-receiving unit 12. When the detector 13b receives a light-receiving signal in the fifth or sixth reception pattern, it detects that the light-receiving unit 12b is in a disconnection state, and the process proceeds to step S8. On the other hand, when the detector 13b does not receive a light-receiving signal in the fifth or sixth reception pattern, that is, when the detector 13b receives a light-receiving signal in the second, third, or fourth reception pattern, the detector 13b does not detect that the light-receiving unit 12b is in a disconnection state, and the process proceeds to step S5.

[0049] In step S5, the light emission control unit 13a controls the light emitting unit 11b to stop emitting the light B.

[0050] In step S6, the detector 13b detects that the light-receiving unit 12b is in a short-circuit state based on the light-receiving signal output from the light-receiving unit 12. When the detector 13b receives a light-receiving signal in the second, third, or fourth reception pattern, it detects that the light-receiving unit 12b is in a short-circuit state, and the process proceeds to step S7. On the other hand, when the detector 13b does not receive a light-receiving signal in the second, third, or fourth reception pattern, it does not detect that the light-receiving unit 12b is in a short-circuit state, and the process proceeds to step S9.

[0051] In step S7, the detector 13b outputs a short-circuit detection signal to the alarm 15. The alarm 15 notifies an elevator worker or the like that the light-receiving unit 12b is in a short-circuit state.

[0052] In step S8, the detector 13b outputs a disconnection detection signal to the alarm 15. The alarm 15 notifies an elevator worker or the like that the light-receiving unit 12b is in a disconnection state.

[0053] In step S9, the car control unit 13c determines whether or not an operation stop release signal output from the switch 14 has been received. When the worker repairs the detachment of the counterweight 3b from the rail, the short circuit state of the light receiving unit 12b, and the open circuit state of the light receiving unit 12b, the worker presses the switch 14. When the car control unit 13c does not receive an operation stop release signal, the car control unit 13c repeats step S9. When the car control unit 13c receives an operation stop release signal, the car control unit 13c releases the stop of the operation of the lifting body 3. Then, the processing ends.

[0054] As described above, the rail detachment detection device for an elevator according to the first embodiment includes a photoelectric sensor 9 attached to the counterweight 3b, the photoelectric sensor 9 having a light-emitting element 11b that emits light B and a light-receiving element 12b that receives light B, and a wire 8 that is disposed parallel to the ascending / descending direction of the elevator 3 and is located between the light-emitting element 11b and the light-receiving element 12b at a position that blocks light B from being received by the light-receiving element 12b. When the photoelectric sensor 9 moves so that the wire 8 moves away from this position, the light-receiving element 12b receives light B. When the light-receiving element 12b receives light B, the detector 13b detects that the counterweight 3b has detached from the counterweight guide rail 4b. This configuration allows early detection of the counterweight 3b detaching from the counterweight guide rail 4b.

[0055] Furthermore, the rail derailment detection device for an elevator body according to the first embodiment further includes a light-emission control unit 13a that controls the light-emitting unit 11b. When the light-emission control unit 13a controls the light-emitting unit 11b to stop emitting light B and the detection unit 13b receives a light-receiving signal from the light-receiving unit 12b, the detection unit 13b detects that the light-receiving unit 12b is in a short-circuit state. Therefore, it is possible to detect a short-circuit state of the light-receiving unit 12b, which is an abnormality in the rail derailment detection device for an elevator body.

[0056] Furthermore, in the rail derailment detection device for an elevator body according to the first embodiment, the photoelectric sensor 9 further includes a light-emitting unit 11a that emits light A and a light-receiving unit 12a that receives light A. The wire 8 is positioned so that it blocks light-receiving unit 12b from receiving light B but does not block light-receiving unit 12a from receiving light A. When the photoelectric sensor 9 moves so that the wire 8 moves out of this position, light-receiving unit 12b receives light B and the wire 8 blocks light-receiving unit 12a from receiving light A. When the detection unit 13b does not receive a light reception signal from light-receiving unit 12b and light-receiving unit 12a does not receive light A, the detection unit 13b detects that light-receiving unit 12b is in a disconnected state. This makes it possible to detect a disconnected state of light-receiving unit 12b, which is an abnormality in the rail derailment detection device for an elevator body.

[0057] Furthermore, in the rail derailment detection device for an elevator body according to the first embodiment, the photoelectric sensor 9 further includes a light-emitting unit 11c that emits light C and a light-receiving unit 12c that receives light C. The wire 8 is positioned so that it blocks light-receiving unit 12b from receiving light B but does not block light-receiving unit 12c from receiving light C. When the photoelectric sensor 9 moves so that the wire 8 moves out of this position, light-receiving unit 12b receives light B and light-receiving unit 12c receives light C, the wire 8 blocks light-receiving unit 12b from receiving light B and light-receiving unit 12c from receiving light C. When the detector 13b does not receive a light-receiving signal from the light-receiving unit 12b and the light-receiving unit 12c does not receive light C, the detector 13b detects that the light-receiving unit 12b is in a disconnected state. This makes it possible to detect a disconnected state of the light-receiving unit 12b, which is an abnormality in the rail derailment detection device for an elevator body.

[0058] Furthermore, in the rail derailment detection device for an elevator body according to the first embodiment, the photoelectric sensor 9 further includes a light-emitting unit 11a that emits light A, a light-receiving unit 12a that receives light A, and a light-emitting unit 11c that emits light C and a light-receiving unit 12c that receives light C. The wire 8 is disposed in a position that blocks light-receiving unit 12b from receiving light B, does not block light-receiving unit 12a from receiving light A, and does not block light-receiving unit 12c from receiving light C. The light-emitting units 11a and 11c and the light-receiving units 12a and 12c are disposed such that the optical path of light B is between the optical paths of light A and light C in a plan view. The detector 13b detects that the light-receiving unit 12b is in a disconnected state when the detector 13b does not receive a signal indicating that light B has been received from the light-receiving unit 12b, and the light-receiving unit 12b does not receive light B or the light-receiving unit 12c does not receive light C. Therefore, even when the counterweight 3b comes off the counterweight guide rail 4b so as to move away from the wire 8, or even when the counterweight 3b comes off the counterweight guide rail 4b so as to move closer to the wire 8, it is possible to detect a broken wire in the light receiving unit 12b, which is an abnormality in the rail detachment detection device of the lifting body.

[0059] Although an example has been described in which the photoelectric sensor 9 is provided on the counterweight 3b and detects that the counterweight 3b has come off the counterweight guide rail 4b, the photoelectric sensor 9 may also be provided on the car 3a and detect that the car 3a has come off the car guide rail 4a.

[0060] Although the example in which the photoelectric sensor 9 is attached to the upper end of the counterweight 3b has been described, the photoelectric sensor 9 may be attached to any position on the counterweight 3b. For example, the photoelectric sensor 9 may be attached to the lower end of the counterweight 3b.

[0061] Although the example in which light-emitting unit 11b is disposed between light-emitting unit 11a and light-emitting unit 11c and light-receiving unit 12b is disposed between light-receiving unit 12a and light-receiving unit 12c has been described, light-emitting units 11a and 11c and light-receiving units 12a and 12c may be disposed such that, in a plan view, the optical path of light B is between the optical path of light A and the optical path of light C. For example, light-emitting unit 11b may be disposed between light-emitting unit 11a and light-emitting unit 11c, and light-receiving unit 12b may be disposed between light-receiving unit 12a and light-receiving unit 12c.

[0062] Embodiment 2 In the first embodiment, an example has been described in which the wire 8 blocks the light receiving unit 12b from receiving the light B. In the second embodiment, an example will be described in which the counterweight guide rail 4b blocks the light receiving unit 12b from receiving the light B. Specifically, the position where the photoelectric sensor 9 is provided and the processing of the control unit 13 are different from those in the first embodiment, and the differences will be described below.

[0063] Fig. 10 shows a side view of the counterweight 3b and the photoelectric sensor 9. As shown in Fig. 10, the photoelectric sensor 9 is provided on the counterweight 3b. Specifically, the photoelectric sensor 9 is attached to the upper end of the counterweight 3b at a position facing the counterweight guide rail 4b. Note that the suspension body 7 is not shown in Fig. 10 and Figs. 11 and 15 described below.

[0064] Fig. 11 shows a plan view of the counterweight 3b and the photoelectric sensor 9, and Fig. 12 shows an enlarged plan view of the counterweight 3b and the photoelectric sensor 9. As shown in Figs. 11 and 12, the light-emitting unit 11a is disposed opposite the light-receiving unit 12a in the left-right direction, the light-emitting unit 11b is disposed opposite the light-receiving unit 12b in the left-right direction, and the light-emitting unit 11c is disposed opposite the light-receiving unit 12c in the left-right direction. The optical paths of light A emitted by the light-emitting unit 11a, light B emitted by the light-emitting unit 11b, and light C emitted by the light-emitting unit 11c are parallel to the left-right direction.

[0065] The light-emitting units 11a, b and the light-receiving units 12a, b are disposed at positions where the counterweight guide rail 4b blocks the light-receiving units 12a, b from receiving light A and B when the counterweight 3b is not dislocated from the counterweight guide rail 4b. The light-emitting unit 11c and the light-receiving unit 12c are disposed at positions where the counterweight guide rail 4b does not block the light-receiving unit 12c from receiving light C when the counterweight 3b is not dislocated from the counterweight guide rail 4b. In other words, the photoelectric sensor 9 is attached at a position where the light-receiving units 12a, b are blocked from receiving light A and B by the counterweight guide rail 4b when the counterweight 3b is not dislocated from the counterweight guide rail 4b.

[0066] Next, we will explain the mechanism by which the detector 13b detects that the counterweight 3b has come off the counterweight guide rail 4b based on the light-receiving signal output from the light-receiving unit 12. First, we will explain the reception pattern of the light-receiving signal received by the detector 13b using Fig. 13.

[0067] Fig. 13 is a diagram showing a reception pattern of a light receiving signal received by the detecting unit 13b. In Fig. 13, "ON" written in the column direction of "light receiving unit 12a," "light receiving unit 12b," and "light receiving unit 12c" indicates that the detecting unit 13b has received a light receiving signal from the light receiving unit 12, and "OFF" indicates that the detecting unit 13b has not received a light receiving signal from the light receiving unit 12.

[0068] There are three reception patterns for the detector 13b. The first is a seventh reception pattern in which the detector 13b receives a light reception signal from the light receiving unit 12c but does not receive a light reception signal from the light receiving units 12a and 12b. The second is an eighth reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12a, 12b, and 12c. The third is a ninth reception pattern in which the detector 13b receives a light reception signal from the light receiving units 12a and 12c but does not receive a light reception signal from the light receiving unit 12b.

[0069] Next, we will explain the output of the light receiving signal from the light receiving unit 12 when the counterweight 3b has not come off the counterweight guide rail 4b, and the reception pattern of the detection unit 13b at this time. As shown in Figure 12, when the counterweight 3b has not come off the counterweight guide rail 4b, the light receiving unit 12c receives light C, but the light receiving units 12a and 12b are blocked from receiving light A and B by the counterweight guide rail 4b. Therefore, the light receiving unit 12c outputs a light receiving signal, and the light receiving units 12a and 12b do not output a light receiving signal. At this time, the detection unit 13b receives the light receiving signal in the seventh pattern.

[0070] Next, we will explain the output of the light receiving signal from the light receiving unit 12 when the counterweight 3b comes off the counterweight guide rail 4b, and the reception pattern of the detection unit 13b at this time. As shown in FIG. 14, when the counterweight 3b comes off the counterweight guide rail 4b, the photoelectric sensor 9 moves from a position where the counterweight guide rail 4b blocks the reception of light A and B by the light receiving units 12a and 12b. At this time, the photoelectric sensor 9 moves in conjunction with the movement of the counterweight 3b. Then, the light receiving units 12a, 12b, and 12c receive light A, 12b, and 12c. Therefore, the light receiving units 12a, 12b, and 12c output light receiving signals. At this time, the detection unit 13b receives light receiving signals in the eighth pattern.

[0071] As described above, when the detector 13b receives a light-receiving signal in the eighth receiving pattern, it can detect that the counterweight 3b has come off the counterweight guide rail 4b. In other words, when the light-receiving units 12a and 12b receive light A and light B, the detector 13b can detect that the counterweight 3b has come off the counterweight guide rail 4b.

[0072] Next, a mechanism will be described in which the detecting unit 13b detects that the light receiving unit 12b is in a short-circuit state based on the light receiving signal output from the light receiving unit 12. When the light receiving unit 12b is in a short-circuit state and the counterweight 3b comes off the counterweight guide rail 4b as shown in Fig. 14, the photoelectric sensor 9 moves from a position where the counterweight guide rail 4b blocks the light receiving units 12a and 12b from receiving the light A and B. Then, the light receiving units 12a, 12b, and 12c receive the light A, B, and C.

[0073] Here, when light-receiving unit 12b is in a short-circuit state, light-receiving unit 12b outputs a light-receiving signal regardless of whether light B is received. In other words, even if light-emitting unit 11b stops emitting light B, light-receiving unit 12 outputs a light-receiving signal. Therefore, when light-emitting unit 11b stops emitting light B and detection unit 13b receives a light-receiving signal in the eighth reception pattern, detection unit 13b can detect that light-receiving unit 12b is in a short-circuit state. In other words, when light-emission control unit 13a controls light-emitting unit 11b to stop emitting light B and detection unit 13b receives a light-receiving signal from light-receiving unit 12b, detection unit 13b can detect that light-receiving unit 12b is in a short-circuit state.

[0074] Next, a mechanism will be described in which the detector 13b detects that the light-receiving unit 12b is in an open state based on the light-receiving signal output from the light-receiving unit 12. When the light-receiving unit 12b is in a short-circuit state and the counterweight 3b comes off the counterweight guide rail 4b as shown in Fig. 14, the photoelectric sensor 9 moves from a position where the counterweight guide rail 4b blocks the light-receiving units 12a and 12b from receiving the light A and B. Then, the light-receiving units 12a, 12b, and 12c receive the light A, B, and C.

[0075] Here, when light receiving unit 12b is in a disconnection state, light receiving unit 12b does not output a light reception signal regardless of whether light B is received. In other words, even if light emitter 11b is irradiating light B, light receiving unit 12b does not output a light reception signal. Therefore, when detector 13b receives a light reception signal in the ninth reception pattern, detector 13b can detect that light receiving unit 12b is in a disconnection state. In other words, when detector 13b does not receive a light reception signal from light receiving unit 12b and light receiving unit 12a receives light A, detector 13b can detect that light receiving unit 12b is in a disconnection state.

[0076] Furthermore, when the detecting unit 13b receives a light receiving signal from the light receiving unit 12a, it is determined from the movement of the photoelectric sensor 9 that the light receiving unit 12a has received light A. Therefore, when the detecting unit 13b receives a light receiving signal in the ninth receiving pattern, it can also simultaneously detect that the counterweight 3b has come off the counterweight guide rail 4b.

[0077] Next, the operation of this embodiment will be described with reference to Fig. 9. In this embodiment, among the processes of the control unit 13, the processes in steps S1, S4, and S6 are different from those in the first embodiment, and therefore these will be described.

[0078] In step S1, the detector 13b detects that the counterweight 3b has come off the counterweight guide rail 4b based on the light-receiving signal output from the light-receiving unit 12. Specifically, the detector 13b receives the light-receiving signal output by the light-receiving unit 12. When the detector 13b receives the light-receiving signal in the seventh receiving pattern, it does not detect that the counterweight 3b has come off the counterweight guide rail 4b, and repeats step S1. On the other hand, when the detector 13b does not receive the light-receiving signal in the seventh receiving pattern, that is, when it receives the light-receiving signal in the eighth or ninth receiving pattern, it detects that the counterweight 3b has come off the counterweight guide rail 4b, and the process proceeds to step S2.

[0079] In step S4, the detector 13b detects that the light-receiving unit 12b is in a disconnection state based on the light-receiving signal output from the light-receiving unit 12. When the detector 13b receives a light-receiving signal in the ninth receiving pattern, the detector 13b detects that the light-receiving unit 12b is in a disconnection state, and the process proceeds to step S8. On the other hand, when the detector 13b does not receive a light-receiving signal in the ninth receiving pattern, that is, when the detector 13b receives a light-receiving signal in the eighth receiving pattern, the detector 13b does not detect that the light-receiving unit 12b is in a disconnection state, and the process proceeds to step S5.

[0080] In step S6, the detector 13b detects that the light-receiving unit 12b is in a short-circuit state based on the light-receiving signal output from the light-receiving unit 12. When the detector 13b receives a light-receiving signal in the eighth receiving pattern, it detects that the light-receiving unit 12b is in a short-circuit state, and the process proceeds to step S7. On the other hand, when the detector 13b does not receive a light-receiving signal in the eighth receiving pattern, it does not detect that the light-receiving unit 12b is in a short-circuit state, and the process proceeds to step S9.

[0081] As described above, the rail detachment detection device for an elevator according to the second embodiment includes a photoelectric sensor 9 provided on the counterweight 3b, the photoelectric sensor 9 having a light-emitting unit 11b that emits light B and a light-receiving unit 12b that receives light B, the photoelectric sensor 9 being attached at a position where the counterweight guide rail 4b blocks the light-receiving unit 12b from receiving light B, and a detection unit 13b that detects that the counterweight 3b has detached from the counterweight guide rail 4b. As the photoelectric sensor 9 moves from this position, the light-receiving unit 12b receives light B. When the light-receiving unit 12b receives light B, the detection unit 13b detects that the counterweight 3b has detached from the counterweight guide rail 4b. This configuration allows early detection of the counterweight 3b detaching from the counterweight guide rail 4b.

[0082] Furthermore, in the rail derailment detection device for an elevator body according to the first embodiment, the photoelectric sensor 9 further includes a light-emitting unit 11a that emits light A and a light-receiving unit 12a that receives light A. The photoelectric sensor 9 is attached at a position where the counterweight guide rail 4b blocks the light-receiving units 12a and 12b from receiving light A and B. When the photoelectric sensor 9 moves from this position, the light-receiving units 12a and 12b receive light A and B. When the detection unit 13b does not receive a light-receiving signal from the light-receiving unit 12b and the light-receiving unit 12a receives light A, the detection unit 13b detects that the light-receiving unit 12b is in a disconnected state. This makes it possible to detect a disconnected state of the light-receiving unit 12b, which is an abnormality in the rail derailment detection device for an elevator body.

[0083] 15, two photoelectric sensors 9 may be provided. In this case, the two photoelectric sensors 9 are attached to the upper end of the counterweight 3b at positions facing the counterweight guide rail 4b. With this configuration, even if one of the ends of the counterweight 3b comes off the counterweight guide rail 4b, it is possible to reliably detect the detachment of the counterweight 3b from the rail.

[0084] In the second embodiment, similarly to the first embodiment, the photoelectric sensor 9 may be provided on the car 3a to detect that the car 3a has come off the car guide rail 4a.

[0085] The photoelectric sensor 9 may be disposed at a position where the counterweight guide rail 4b blocks the light receiving portion 12b from receiving the light B. For example, the photoelectric sensor 9 may be attached to the lower end of the counterweight 3b.

[0086] An example of the configuration of the processing circuit of the control unit 13 will be described with reference to Fig. 16. Fig. 16 is a diagram showing an example of the configuration of the processing circuit of the control unit 13 in the first embodiment. Note that the example of the configuration of the processing circuit of the control unit 13 is the same in the second embodiment.

[0087] Each function of the control unit 13 can be realized by a processing circuit. For example, the processing circuit includes at least one processor 16a and at least one memory 16b. Also, for example, the processing circuit includes at least one dedicated hardware 17.

[0088] When the processing circuit includes at least one processor 16a and at least one memory 16b, the functions of the control unit 13 are implemented by software, firmware, or a combination of software and firmware. At least one of the software and firmware is written as a program. At least one of the software and firmware is stored in the at least one memory 16b. The at least one processor 16a implements the functions of the control unit 13 by reading and executing the program stored in the at least one memory 16b. The at least one processor 16a is also referred to as a CPU (Central Processing Unit), central processing unit, processing device, arithmetic unit, microprocessor, microcomputer, or DSP. For example, the at least one memory 16b may be a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM, a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD.

[0089] When the processing circuit includes at least one dedicated hardware 17, the processing circuit is realized, for example, by a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. For example, each function of the control unit 13 is realized by a processing circuit. For example, each function of the control unit 13 is realized collectively by a processing circuit.

[0090] Some of the functions of the control unit 13 may be realized by dedicated hardware 17, and the other parts may be realized by software or firmware.

[0091] In this way, the processing circuitry realizes the functions of the control unit 13 by means of hardware 17, software, firmware, or a combination of these.

[0092] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) a photoelectric sensor provided on a lifting body that moves up and down along a guide rail, the photoelectric sensor having a first light emitting unit that irradiates a first light and a first light receiving unit that receives the first light; a wire that is provided parallel to the ascending and descending direction of the ascending and descending body, and is disposed between the first light-emitting unit and the first light-receiving unit at a position that blocks the first light-receiving unit from receiving the first light; a detection unit that detects when the lifting body comes off the guide rail; Equipped with When the photoelectric sensor moves so that the wire is moved away from the position, the first light receiving unit receives the first light, The detection unit is a rail detachment detection device for an elevator body that detects that the elevator body has detached from the guide rail when the first light receiving unit receives the first light. (Appendix 2) a light-emitting control unit that controls the first light-emitting unit; Furthermore, A rail derailment detection device for an elevator described in Appendix 1, wherein when the light-emitting control unit controls the first light-emitting unit to stop emitting the first light and the detection unit receives a signal from the first light-receiving unit indicating that the first light has been received, the detection unit detects that the first light-receiving unit is in a short-circuit state. (Appendix 3) the photoelectric sensor further includes a second light emitting unit that emits second light and a second light receiving unit that receives the second light, the position of the wire is a position that blocks the first light receiving unit from receiving the first light and does not block the second light receiving unit from receiving the second light, When the photoelectric sensor moves so that the wire is out of position, the first light receiving unit receives the first light and the second light receiving unit receives the second light, and the wire blocks the first light receiving unit from receiving the first light and the second light receiving unit from receiving the second light, A rail derailment detection device for an elevator body described in Appendix 1 or 2, in which the detection unit detects that the first light receiving unit is in a broken state when the detection unit does not receive a signal from the first light receiving unit indicating that the first light has been received and the second light receiving unit does not receive the second light. (Appendix 4) the photoelectric sensor further includes a third light emitting unit that irradiates a third light and a third light receiving unit that receives the third light, the position of the wire is a position that blocks the first light receiving unit from receiving the first light, does not block the second light receiving unit from receiving the second light, and does not block the third light receiving unit from receiving the third light, the second light-emitting unit, the second light-receiving unit, the third light-emitting unit, and the third light-receiving unit are arranged so that an optical path of the first light is between an optical path of the second light and an optical path of the third light in a plan view; The rail derailment detection device for an elevator body described in Appendix 3, wherein the detection unit detects that the first light receiving unit is in a disconnected state when the detection unit does not receive a signal from the first light receiving unit indicating that the first light has been received, and the second light receiving unit does not receive the second light, or the third light receiving unit does not receive the third light. (Appendix 5) a photoelectric sensor provided on an elevator that moves up and down along a guide rail, the photoelectric sensor having a light-emitting unit that irradiates light and a light-receiving unit that receives the light, the photoelectric sensor being attached at a position where the light-receiving unit is blocked from receiving the light by the guide rail; a detection unit that detects when the lifting body comes off the guide rail; Equipped with When the photoelectric sensor moves from the position, the light receiving unit receives the light, The detection unit is a rail disengagement detection device for an elevator body that detects that the elevator body has disengaged from the guide rail when the light receiving unit receives the light. [Explanation of symbols]

[0093] 1 elevator shaft, 2 machine room, 3a car, 3b counterweight, 3ba upper guide shoe, 3bb lower guide shoe, 4a car guide rail, 4b counterweight guide rail, 8 wire, 9 photoelectric sensor, 10 control device, 11a light emitting unit, 11b light emitting unit, 11c light emitting unit, 12a light receiving unit, 12b light receiving unit, 12c light receiving unit, 13 control unit, 13a light emitting control unit, 13b detection unit

Claims

1. a photoelectric sensor provided on a lifting body that moves up and down along a guide rail, the photoelectric sensor having a first light emitting portion that emits a first light and a first light receiving portion that receives the first light; a wire that is provided parallel to the ascending and descending direction of the ascending and descending body, and is disposed between the first light-emitting unit and the first light-receiving unit at a position that blocks the first light-receiving unit from receiving the first light; a detection unit that detects when the lifting body comes off the guide rail; Equipped with When the photoelectric sensor moves so that the wire is moved away from the position, the first light receiving unit receives the first light, The detection unit is a rail detachment detection device for an elevator body that detects that the elevator body has detached from the guide rail when the first light receiving unit receives the first light.

2. a light emission control unit that controls the first light emission unit; Furthermore, A rail derailment detection device for an elevator body as described in claim 1, wherein when the light-emitting control unit controls the first light-emitting unit to stop emitting the first light and the detection unit receives a signal from the first light-receiving unit indicating that the first light has been received, the detection unit detects that the first light-receiving unit is in a short-circuit state.

3. the photoelectric sensor further includes a second light emitting unit that irradiates a second light and a second light receiving unit that receives the second light, the position of the wire is a position that blocks the first light receiving unit from receiving the first light and does not block the second light receiving unit from receiving the second light, When the photoelectric sensor moves so that the wire is out of position, the first light receiving unit receives the first light and the second light receiving unit receives the second light, and the wire blocks the first light receiving unit from receiving the first light and the second light receiving unit from receiving the second light, A rail derailment detection device for an elevator body as described in claim 1 or 2, wherein the detection unit detects that the first light receiving unit is in a broken state when the detection unit does not receive a signal from the first light receiving unit indicating that the first light has been received and the second light receiving unit does not receive the second light.

4. the photoelectric sensor further includes a third light-emitting unit that emits third light and a third light-receiving unit that receives the third light, the position of the wire is a position that blocks the first light receiving unit from receiving the first light, does not block the second light receiving unit from receiving the second light, and does not block the third light receiving unit from receiving the third light, the second light-emitting unit, the second light-receiving unit, the third light-emitting unit, and the third light-receiving unit are arranged such that an optical path of the first light is between an optical path of the second light and an optical path of the third light in a plan view; A rail derailment detection device for an elevator body as described in claim 3, wherein the detection unit detects that the first light receiving unit is in a broken state when the detection unit does not receive a signal from the first light receiving unit indicating that the first light has been received, and the second light receiving unit does not receive the second light, or the third light receiving unit does not receive the third light.

5. a photoelectric sensor provided on an elevator that moves up and down along a guide rail, the photoelectric sensor having a light-emitting unit that irradiates light and a light-receiving unit that receives the light, the photoelectric sensor being attached at a position where the light-receiving unit is blocked from receiving the light by the guide rail; a detection unit that detects when the lifting body comes off the guide rail; a light emission control unit that controls the light emission unit; Equipped with When the photoelectric sensor moves from the position, the light receiving unit receives the light, The detection unit When the light receiving unit receives the light, it detects that the lifting body has come off the guide rail, A rail derailment detection device for an elevator body, in which when the light emission control unit controls the light emission unit to stop emitting the light and the detection unit receives a signal from the light receiving unit indicating that it has received the light, the detection unit detects that the light receiving unit is in a short-circuited state.

6. A photoelectric sensor provided on an elevator that moves up and down along a guide rail, having a first light-emitting unit that irradiates a first light and a first light-receiving unit that receives the first light, as well as a second light-emitting unit that irradiates a second light and a second light-receiving unit that receives the second light, and is attached at a position where the guide rail blocks the first light from being received by the first light-receiving unit and the guide rail blocks the second light from being received by the second light-receiving unit; a detection unit that detects when the lifting body comes off the guide rail; Equipped with When the photoelectric sensor moves from the position, the first light receiving unit receives the first light and the second light receiving unit receives the second light, The detection unit When the first light receiving unit receives the first light, it detects that the lifting body has come off the guide rail; A rail derailment detection device for an elevator that detects that the first light receiving unit is in a disconnected state when the first light receiving unit does not receive a signal indicating that the first light has been received and the second light receiving unit receives the second light.

Images