JP6272734B2 - Foreign object pinching detection device - Google Patents

Description

  The present invention relates to a foreign object pinching detection device.

  In an elevator, pinching of foreign matter may be a problem in a sheave of a hoisting machine on which a main rope is wound. For example, as shown in FIG. 9, Patent Document 1 discloses a foreign object detection device 69 installed at a certain interval on a sheave 60 of a hoisting machine. Here, when the foreign matter 61 is sandwiched between the sheave 60 and the main rope 62, the main rope 62 is lifted from the outer peripheral surface of the sheave 60, and the main rope 62 contacts the detection plate 64. And the structure which overcomes the urging | biasing force of the coil spring 66 which supports this detection plate 64, operates the detector 68, and detects the foreign material 61 is disclosed. At this time, when the main rope 62 comes into contact with the trail plate 70 containing ink or the like, a trace is left on the main rope 62.

JP 2000-16715 A

  According to the configuration of Patent Document 1, there is a certain distance between the sheave 60 and the foreign object detection device 69, so there is a possibility that a foreign object smaller than that distance cannot be detected. Further, even if a trace due to ink or the like remains on the main rope 61, it takes time to search for the corresponding portion in the entire main rope 61.

  An object of the present invention is to more appropriately detect foreign matter caught between a sheave and a main rope of a hoisting machine.

  A foreign object pinching detection device according to the present invention is a base part provided on a floor surface of a pit that is a lower part of a hoistway, and a sheave provided standing in the pit so as to be movable with respect to the base part. A movable portion extending at a predetermined interval from the outer peripheral surface of the sheave on which the rope is wound, and a roller provided on the movable portion so as to be able to contact the main rope wound on the outer peripheral surface of the sheave. An urging means for applying an urging force so that the roller comes into contact with the main rope; and provided in the movable portion, and pressed by the roller when a foreign object is caught between the sheave and the main rope. And a detection unit that detects the movement of the movable unit.

  The foreign object pinching detection apparatus according to the present invention preferably further includes a storage unit that stores a position of the car when the movement of the movable unit is detected by the detection unit.

  According to the above configuration, the foreign matter is sandwiched between the sheave and the main rope so that the main rope is lifted, and the detection unit detects that the movable portion has been moved by the roller in contact with the main rope. Thereby, it is detected that a foreign object is caught between the sheave and the main rope.

In embodiment which concerns on this invention, it is a figure which shows an elevator. In embodiment which concerns on this invention, it is an enlarged view of a winding machine and a foreign material pinching detection apparatus. It is a block diagram of the control part of the foreign object pinch detection apparatus of embodiment which concerns on this invention. In the foreign object pinching detection apparatus of the embodiment according to the present invention, a state where no foreign object is pinched is shown. In the foreign object pinching detection apparatus of the embodiment according to the present invention, a state in which a foreign object is pinched is shown. It is a flowchart which shows the procedure which detects the pinching of a foreign material with the foreign material pinch detection apparatus of embodiment which concerns on this invention. In embodiment which concerns on this invention, the displacement amount of the X-axis direction of the detection part when a soft foreign material, such as cloth, is pinched, the Y-axis direction, and the Z-axis direction is shown. In embodiment which concerns on this invention, the displacement amount of the X-axis direction of a detection part when a lump | aggregate foreign material, such as cement, is crushed, a Y-axis direction, and a Z-axis direction is shown. It is a figure which shows the foreign material pinching detection apparatus of a prior art.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Also, in the following, corresponding elements in all drawings are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram showing an elevator 1. In the elevator 1, the passenger car 4 is moved up and down in the hoistway 8 to move the passenger to a desired destination floor. The car 4 is connected to one side of the main rope 3, and the counterweight 2 is connected to the other side of the main rope 3. An intermediate portion of the main rope 3 is wound around a sheave 7 of the hoisting machine 6 disposed in the pit 5 that is the lower part of the hoistway 8, and the main rope 3 is rotated by the rotating operation of the sheave 7 of the hoisting machine 6. 3 is moved, whereby the car 4 and the counterweight 2 are raised and lowered in opposite directions.

  FIG. 2 is an enlarged view of the hoisting machine 6 and the foreign object pinching detection device 10. The foreign object pinching detection device 10 detects that the foreign object 23 is pinched between the sheave 7 of the hoisting machine 6 and the main rope 3. The foreign object pinching detection device 10 includes a base part 12, a movable part 14, a roller 16, a coil spring 18, a detection part 20, and a control part 22.

  A hard resin roller 16 is in contact with the main rope 3 wound around the sheave 7. The roller 16 is rotatably attached to the movable portion 14. That is, the roller 16 rotates following the rotation of the sheave 7. In practice, a plurality of main ropes 3 are provided in the depth direction, and three in the example of FIG. 4, and the outer peripheral surface of the roller 16 and the plurality of main ropes 3 are in contact with each other in a normal state. .

  The movable portion 14 is bent at the distal end of the extending portion 24 and an extending portion 24 extending substantially perpendicularly to the floor surface of the pit 5 with a predetermined interval around the outer peripheral surface of the sheave 7 around which the main rope 3 is wound, And a parallel surface portion 26 parallel to the floor surface of the pit 5. The movable portion 14 is made of a material having an appropriate strength such as stainless steel.

  The base portion 12 has a concave shape on the upper surface, and the lower portion of the movable portion 14 is inserted into the concave shape portion of the base portion 12. The base 12 is made of a material having an appropriate strength such as stainless steel. The lower part of the movable part 14 is substantially spherical, and is supported by a fulcrum 28 having a shape along the outer shape of the lower part of the movable part 14 so as to be movable in the XYZ axial directions.

  The coil spring 18 has one end connected to the extending portion 24 and the other end connected to the base portion 12 and is mounted across the extending portion 24 and the base portion 12, and exerts an urging force so that the roller 16 contacts the main rope 3. The tension spring giving. A pair of the coil springs 18 may be provided so as to connect both sides of the extending portion 24 in the axial direction of the roller 16 and corresponding positions of the base portion 12, or the upper end of one coil spring 18 may be bifurcated. You may engage with the both sides of the part 24. FIG. Further, one coil spring 18 may be provided by connecting between the central portion of the extending portion 24 in the axial direction of the roller 16 and the corresponding position of the base portion 12. In any case, the roller 16 is pressed against the main rope 3 by the coil spring 18 with the axis of the roller 16 being parallel to the axis of the sheave 7. In this example, the movable portion 14 is fitted in the concave portion of the base portion 12, but the movable portion 14 may be movable in the axial direction of the extending portion 24. In this case, it is preferable to provide a plurality of coil springs 18 so as to stably press the extending portion 24 toward the base portion 12 in the axial direction.

  The detection unit 20 includes an acceleration sensor that detects that the movable unit 14 has moved in the XYZ axis directions. The acceleration sensor detects the movement state of the object in the XYZ axis directions by measuring the acceleration (rate of change of speed) of the object. Data detected by the detection unit 20 is transmitted to the control unit 22 via a transmission line.

  FIG. 3 is a configuration diagram of the control unit 22. The control unit 22 determines whether or not the foreign object 23 is sandwiched between the sheave 7 and the main rope 3 based on the data transmitted from the detection unit 20. The control unit 22 acquires the data transmitted from the detection unit 20 via the input I / F 29, and the amount of movement of the movable unit 14 in the XYZ axis direction is calculated in the foreign object pinching arithmetic device 30 of the control unit 22.

  FIG. 4 shows a state in which no foreign matter is sandwiched in the cross-sectional view taken along the line AA in FIG. FIG. 5 shows a state in which a foreign object is sandwiched in the cross-sectional view taken along the line AA of FIG. For example, when a soft object such as a piece of cloth is sandwiched as the foreign material 23, the main rope 3 is lifted by the rotation of the sheave 7 and the roller 16 moves in the X-axis direction. Further, for example, when a lump of cement or the like is sandwiched as the foreign matter 23, the entire hoisting machine 6 is shaken by an impact when the foreign matter 23 is crushed by the contact pressure between the sheave 7 and the main rope 3. In this case, the entire hoisting machine 6 moves not only in the X-axis direction but also in the Y-axis direction and the Z-axis direction, and this shaking is detected by the detection unit 20 via the base unit 12 and the rollers 16. The The calculation result of the foreign object pinching calculation device 30 is transmitted to the control calculation device 32. 5 shows a state in which the two main ropes 3 are lifted in the X-axis direction, but when the lifts of the three main ropes 3 are not uniform, the axis of the roller 16 is centered on the inclination Z axis. Rotation can occur and movement in the Y-axis direction can also occur.

  The control arithmetic device 32 determines whether or not the foreign matter 23 is sandwiched between the sheave 7 and the main rope 3 based on the calculation result of the foreign matter pinching calculation device 30. Specifically, the control arithmetic device 32 determines that a large foreign object 23 has been caught when the movement amount X of the detection unit 20 in the X-axis direction exceeds Xmax. The Xmax is preferably set according to the maximum swing width of the main rope 3 that is allowed in the stopper that prevents the main rope 3 from coming off the sheave 7. Further, in the control arithmetic device 32, the movement amount X of the detection unit 20 in the X-axis direction is less than or equal to Xmax, but when it is greater than or equal to Xmin, a relatively small foreign object is sandwiched or the foreign object 23 is sandwiched. Thereafter, it is determined that the foreign matter 23 has been crushed and the entire hoisting machine 6 has been shaken. Further, not only the movement amount X but also the movement amount Y in the Y-axis direction is Ymin or more and the same determination is performed when the movement amount Z in the Z-axis direction is Zmin or more.

  Here, in order to increase the detection accuracy, the displacement changes from 0 to the peak state by rotating the sheave 7 with a foreign object interposed therebetween, and then the movement amounts X, Y, It is preferable that the accumulated Z is a determination target. For example, the arithmetic unit 30 takes N displacements for each axial displacement every predetermined time and sets the accumulated values as displacements X, Y, Z, so that the reference Xmax and Xmin are relatively large values. As a result, erroneous determination can be prevented.

  When the control calculation device 32 determines that a foreign object is sandwiched between the sheave 7 and the main rope 3, the position of the car 4 is determined by the car position calculation device 34. At this time, the control arithmetic device 32 stores the position information of the car 4 and the movement amounts X, Y, Z of the detection unit 20 in the abnormal data storage unit 36. Then, the control arithmetic device 32 notifies the monitoring center 42 that a foreign object has been caught via the communication I / F 38 and the public network 40.

  Next, the operation of the foreign object pinching detection device 10 having the above configuration will be described. FIG. 6 is a flowchart showing a procedure for detecting foreign object pinching by the foreign object pinching detection apparatus 10. First, the control arithmetic unit 32 initializes data (S2). Then, the displacement amounts X, Y, and Z at the respective times in the X-axis, Y-axis, and Z-axis directions when the sheave 7 of the hoisting machine 6 rotates for a predetermined time are respectively held (S4). As described above, the displacement amounts X, Y, and Z are preferably accumulated values for a predetermined time.

  It is determined whether or not the displacement amount X of the detection unit 20 in the X-axis direction exceeds Xmax (S6). In the process of S6, if X> Xmax, it is determined that a soft foreign material 23 such as a cloth is sandwiched between the sheave 7 and the main rope 3, and the monitoring center 42 is notified (S8). FIG. 7 shows a state in which the displacement amount X in the X-axis direction changes stepwise when the soft foreign matter 23 such as cloth is sandwiched and the foreign matter 23 becomes a dumpling-like ridge. Thus, when X> Xmax, it can be determined that the foreign object 23 is sandwiched. Note that by setting the displacement X to be a cumulative value for a longer time, a value corresponding to the integral value of the displacement X as shown in FIG. 7 can be obtained, and this integral value may be compared with a predetermined threshold value. .

  If X ≦ Xmax is determined in step S6, it is determined whether X> Xmin is satisfied (S10). If it is determined in the step S10 that X> Xmin, a lump of cement or the like is sandwiched between the sheave 7 and the main rope 3 as the foreign matter 23, and is crushed by the contact pressure between the sheave 7 and the main rope 3. It is determined that the entire hoisting machine 6 has been shaken due to the impact at the time, and the monitoring center 42 is notified (S12). FIG. 8 shows a state in which the change amount X changes smaller than that in FIG. 7 when a foreign object such as cement is crushed.

  If it is determined in the step of S10 that X ≦ Xmin, it is determined whether or not Y> Ymin (S14). If it is determined in step S12 that Y> Ymin, the process proceeds to step S12.

  If it is determined in step S14 that Y ≦ Ymin, it is determined whether Z> Zmin is satisfied (S16). If it is determined in step S16 that Z> Zmin, the process proceeds to step S12.

  Here, in steps S8 and S12, the position of the car 4 is determined by the car position calculation unit 34, and the position information of the car 4 and the movement amounts X, Y, and Z of the detection unit 20 are stored in the abnormal data storage unit 36. To remember. Therefore, when the maintenance worker checks the position where the foreign object 23 is sandwiched, the car 4 can be stopped at the position where the abnormality is detected, and the main rope 3 around the hoisting machine 6 at that time can be inspected. When an abnormality is detected, the control arithmetic device 32 notifies the monitoring center 42 that the foreign object 23 has been caught via the communication I / F 38 and the public line network 40. If it is determined in step S16 that Z ≦ Zmin, the END process is performed.

  As described above, the foreign object pinching detection device 10 can detect the lifting of the main rope 3 due to the pinching of the cloth or the like at the displacement X in the X axis direction of the detection unit 20, and can detect the X axis direction and the Y axis direction. It can be determined whether or not the foreign material 23 has been caught in accordance with the displacements X, Y, and Z in the Z-axis direction. Therefore, it is possible to identify whether the foreign material 23 is a soft material such as a cloth or a crushable material such as cement.

  In the above description, the movable portion 14 of the foreign object pinching detection device 10 has been described as being pulled toward the sheave 7 by the coil spring 18, but the movable portion 14 itself is made of a material having an urging force. Also good.

  In the above description, the outer peripheral surface of the roller 16 has been described as a straight surface as shown in FIGS. 4 and 5. However, it is also preferable to provide grooves along the outer shape of the plurality of main ropes 3. .

  In the above description, the control arithmetic device 32 has been described as reporting to the monitoring center 42 when it is determined that the foreign object 23 has been sandwiched between the sheave 7 and the main rope 3. Instead of this, it is preferable to notify the nearest worker.

  DESCRIPTION OF SYMBOLS 1 Elevator, 2 Counterweight, 3 Main rope, 4 Car, 5 Pit, 6 Hoisting machine, 7 Sheave, 8 Hoistway, 10 Foreign object pinching detection device, 12 Base part, 14 Moving part, 16 Roller, 18 Coil Spring, 20 detection unit, 22 control unit, 23 foreign matter, 24 stretching unit, 26 parallel surface unit, 28 fulcrum, 29 input I / F, 30 arithmetic unit, 32 control arithmetic unit, 34 car position arithmetic unit, 36 abnormal data storage unit , 38 Communication I / F, 40 Public line network, 42 Monitoring center.

Claims (2)

A foundation part provided on the floor of the pit, which is the lower part of the hoistway,
A movable portion that is erected so as to be movable with respect to the base portion, and is a sheave provided in the pit and extending at a predetermined interval from an outer peripheral surface of a sheave on which a main rope is wound,
A roller provided on the movable part so as to be able to contact the main rope wound around the outer peripheral surface of the sheave;
Biasing means for imparting a biasing force so that the roller contacts the main rope;
A detection unit that is provided in the movable unit and detects a movement of the movable unit that is pressed by the roller when a foreign object is caught between the sheave and the main rope;
A foreign object pinching detection device comprising: The foreign object pinching detection apparatus according to claim 1,
The foreign object pinching detection apparatus further comprising a storage unit that stores a position of a car when the movement of the movable unit is detected by the detection unit.

Images