JPH0873152A - Load detection device for rope type elevator - Google Patents

Abstract

PURPOSE: To accurately measure a load in an elevator cage, independent of the level of the cage in a shaft. CONSTITUTION: A zone detection means 18 detects what zone an elevator cage belongs to via the vertical division of an elevator shaft into a lower zone, an intermediate zone and an upper zone. A change means 19 selects a limit switch 15a, when the cage is positioned in the lower zone, and selects a limit switch 15b, when the cage is positioned in the intermediate zone, respectively on the basis of detection output from a zone detection means 18. Also, the means 19 selects a limit switch 15c, when the cage is positioned in the upper zone, on the basis of the detection output as well. The limit switch 15a generates detection output, when a cargo load exceeds the first present value, and the limit switch 15b generates detection output, when the load exceeds the second preset value larger than the first preset value. Furthermore, the limit switch 15c generates detection output, when the load exceeds the third preset value larger than the second preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load detecting device for a rope type elevator, and more particularly to a rope type elevator for detecting the load in a car with high accuracy regardless of the height of the car in the hoistway. The present invention relates to a load detection device.

[0002]

2. Description of the Related Art In recent years, with the advanced use of land, buildings for houses and offices, buildings for parking, factories, warehouses, etc. have become higher in level, and as a result, elevators have become more widespread.

FIG. 8 shows the structure of a general rope type elevator. An elevator car 1 has a car upper rope hitch 2 attached thereto, and one end of a main rope 3 is connected to the car upper rope hitch 2. ing. The main rope 3 passes through a hoist 4 and the other end is connected to a counterweight 5, that is, a counterweight 5. The weight of this counterweight 5 is selected to be approximately equal to the weight of the car 1, so that the hoisting machine 4 can operate with a slight torque.
Can be driven up and down.

The tail cord 6 has one end connected to a control device (not shown) in the car 1, and the other end connected to a hoistway relay box 7
This hoistway relay box 7 is connected to the control panel in the machine room. Thus the tail cord 6 is a basket 1
The control equipment inside is electrically connected to the control panel in the machine room.

The drive torque of the hoisting machine 1 is large in accordance with the height position of the car 1 in the hoistway 8 due to the weight of the main rope 3 and the tail cord 6 despite the existence of the counterweight 5. It will change. Therefore, the main rope 3 and the tail cord 6 caused by the height position of the car 1
In order to sufficiently reduce the influence of (1), a compensation rope (hereinafter, referred to as compensating rope) 9 is connected between the car 1 and the counterweight 5.

For safety, the elevator is equipped with a load detecting device for measuring the weight in the elevator car in order to detect an excessive load. In the case of a double floor structure in which a car room is installed in the car 1 like a passenger elevator, this load detection device is provided between the car 1 and the car room. In the case of a single-floor structure where there is no cab room such as an elevator for lifting an automobile or luggage, the load detecting device is a rope hitch 2 on the car as shown in FIGS. 9 and 10.
Is installed in.

More specifically, referring to FIGS. 9 and 10, in the rope type elevator having a roping of 1: 1, the car upper rope hitch 2 is the upper hitch plate 10.
a and a lower hitch plate 10b, and a coil spring 11 is arranged between the upper hitch plate 10a and the lower hitch plate 10b. The upper hitch plate 10a is attached to the car 1, and the lower hitch plate 10b includes the thimble rod 1 at the tip of the main rope 3.
Two are connected. Thus, the upper hitch plate 10a
The distance between the lower hitch plate 10b and the lower hitch plate 10b gradually decreases as the load in the car 1 increases. A lever 13 is attached to the lower hitch plate 10b, and the lever 13 moves upward as the distance between the upper hitch plate 10a and the lower hitch plate 10b narrows, that is, as the load in the car 1 increases.

FIG. 11 is an enlarged view of a portion surrounded by a circle Q in FIG. 10. The pawl 14 attached to the tip of the lever 13 has a cam surface 14a.
4a is a limit switch 1 as the lever 13 moves upward.
Abut 5. When the load in the car 1 exceeds the rated load by a predetermined amount, the limit switch 15 is actuated by the cam surface 14a of the pawl 14 and generates a detection signal as shown in the graph of FIG.

Further, as shown in FIG. 13, a differential transformer 16 is installed on the rear end side of the lever 13, and an iron core 17 of the differential transformer 16 is connected to the rear end of the lever 13.
The differential transformer 16 adjusts the lever 1 according to the load variation in the car.
When 3 goes up and down, the iron core 17 goes up and down in the coil of the differential transformer 16 in conjunction with it as shown in FIG.
Generates a detection output corresponding to the load inside the car 1.

[0010]

However, in the load detecting device for the conventional rope type elevator described above, both the limit switch and the differential transformer are attached to the rope hitch on the car. As described above, in addition to the load W in the car, the weight WT of the tail cord 6 and the weight WC of the compensating rope 9 are applied to the limit switch and the differential transformer.
However, there is a problem in that the load inside the car cannot be accurately detected because of the action of.

Explaining this in detail, it is assumed that the detection load of the limit switch 15 is set to 105% of the rated load when the car 1 is at the center height position of the hoistway 8. In this case, when the car 1 is located on the lowest floor, the weight WC of the compensating rope 9 and the weight WT of the tail cord 6 acting on the limit switch decrease, so that the load in the car 1 exceeds 105%. However, the limit switch does not work. On the contrary, when the car 1 is located on the uppermost floor, the weight WC of the compensating rope 9 and the weight WT of the tail cord 6 acting on the limit switch increase, so that the limit before the load in the car 1 reaches 105%. The switch works.

The same applies to the differential transformer.

As described above, in the conventional rope-type elevator load detecting device, in the case of the rope-type elevator for a high-rise building, the weight WC and the tail of the compensating rope 9 which fluctuate depending on the height position of the car. There is a problem that the influence of the weight WT of the cord 6 cannot be ignored and the load in the car cannot be detected accurately.

Therefore, an object of the present invention is to provide a load detecting device for a rope type elevator which can accurately measure the load inside the car regardless of the height position of the car inside the hoistway.

[0015]

In order to achieve this object, the invention according to claim 1 is used for a rope type elevator having a single car floor and a roping of 1: 1. In a load detection device for a rope type elevator equipped with limit switch means for detecting that the load inside the car has exceeded a predetermined value, the hoistway is divided into a plurality of zones in the vertical direction. However, based on the zone detection means for detecting which zone of the plurality of zones the car is located, and the zone detected by the zone detection means, the higher the position of the detection zone, the more the predetermined value of the limit switch means. And a changing means for changing the magnitude of the predetermined value so that the value becomes large.

In this structure, the limit switch means includes a plurality of limit switches corresponding to the number of the zones, and each of the plurality of limit switches has a predetermined value of a different size, and the change is made. It is preferable that the means changes the predetermined value by selecting the limit switch according to the detection output of the zone detecting means.

Further, it is desirable that the predetermined value of the limit switch means is variable, and the changing means changes the predetermined value of the variable on the basis of the zone detected by the zone detecting means.

The invention according to claim 4 is used in a rope-type elevator having a single-floor car floor and a roping of 1: 1 and is provided in a rope hitch part on a car of the elevator, In a load detecting device for a rope type elevator, which comprises a load detecting means for detecting a load,
A car position detecting means for detecting the height position of the car in the hoistway, and a correcting means for correcting the detection output of the load detecting means by the detection output of the car position detecting means. Is.

In this structure, the load detecting means is a differential transformer, and the correcting means generates a correction value related to the height position of the car based on the detection output of the car position detecting means. Preferably, the correction value generating means and the calculating means for calculating the detection output of the load detecting means and the correction value of the correction value generating means.

The invention according to claim 6 is used in a rope-type elevator having a single-floor car floor and a roping of 1: 1 and is provided in a rope hitch part on a car of the elevator, In a load detecting device for a rope type elevator, which comprises a load detecting means for detecting a load,
It is characterized by comprising weight detection means for detecting the load of the elevator counterweight, and correction means for correcting the detection output of the load detection means by the detection output of the weight detection means.

In this configuration, it is desirable that the correction means add the load detected by the load detection means and the load detected by the weight detection means.

[0022]

The operation of the invention described in claim 1 is as follows. That is, the zone detection means detects in which zone of the plurality of zones the car is located, and the changing means determines the limit switch means according to the zone detected by the zone detection means as the position of the detection zone increases. The size of the predetermined value of the limit switch means is changed so that the value becomes large. Thus, when the car is located at a relatively high position in the hoistway and the car is subjected to a relatively large weight such as a tail cord or a compensating rope, the limit switch means is relatively responsive to that weight. When operating at a large predetermined value, and conversely, the car is at a relatively low position in the hoistway and the car is under a relatively small weight, such as a tail cord or compensating rope, the limit switch means It operates at a relatively small predetermined value in consideration of weight. Therefore, even if the weight of the tail cord, compensating rope, etc. acting on the car varies depending on the height position of the car, the changing means changes the size of the predetermined value accordingly, so that the tail cord, compensating rope, etc. The load in the car can be detected with high accuracy without being affected by the weight of the car.

The operation of the invention described in claim 4 is as follows. That is, the car position detecting means detects the height position of the car in the hoistway, and the correcting means corrects the detection output of the load detecting means by the detection output of the car position detecting means. Thus, even if the weight of the tail cord or compensating rope acting on the car is different depending on the height position of the car, the correcting means corrects the detection output of the load detecting means accordingly, so that the tail cord or compensating rope is corrected. The load in the car can be detected with high accuracy without being affected by the weight of the car.

The operation of the invention described in claim 6 is as follows. That is, the weight detecting means detects the load of the counter weight of the elevator, and the correcting means corrects the detection output of the load detecting means by the detection output of the weight detecting means. In this way, the total of the weight of the tail cord or compensating rope that acts on the car and the weight of the tail cord or compensating rope that acts on the counterweight is always constant regardless of the height position of the car. By correcting the detection output of the detection means by the detection output of the weight detection means, the load in the car can be detected with high accuracy without being affected by the weight of the tail cord, the compensating rope, or the like.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a load detecting device for a rope type elevator according to the present invention will be described below with reference to FIGS. 1 to 7 in which the same parts as those in FIGS.

1 to 3 show a first embodiment of the present invention. 1 and 2, the zone detecting means 18 divides the hoistway 8 into a plurality of zones in the vertical direction, and detects which zone of the plurality of zones the car 1 is located in. Specifically, in the present embodiment, as shown in FIG. 2, for example, a 30-story high-rise building is divided into three zones of a lower zone A, an intermediate zone B, and an upper zone C by 10 floors,
The zone detection means 18 detects which of the lower zone A, the intermediate zone B, and the upper zone C the car 1 is positioned in, and detects the first detection output, the second detection output, and the third detection output.
And the detection output of 1 are generated respectively.

The changing means 19 is based on the detection output of the zone detecting means 18 and has a first limit switch 15a, a second limit switch 15b and a third limit switch 15
Select one of the limit switches from among c and c. That is, the changing means 19 selects the first limit switch 15a based on the detection output of the zone detecting means 18 which has detected that the car 1 is present in the lower zone A, and the car 1
Of the second limit switch 15 based on the detection output of the zone detecting means 18 that has detected that the
b is selected, and the third limit switch 15c is selected based on the detection output of the zone detection means 18 that detects that the car 1 is present in the upper zone C.

The first limit switch 15a, the second limit switch 15b, and the third limit switch 15c.
Is attached to the upper rope hitch 2 of the car shown in FIGS.
The relationship between b and 15c and the pawl 14 that operates them is defined as follows. That is, as shown in FIG. 3, when the car is in the initial state with no load, the vertical distance d between the first limit switch 15a and the cam surface 14a of the pawl 14 is increased.
1 is the second limit switch 15b and the pawl cam surface 14
The vertical distance d2 between the second limit switch 15b and the pawl cam surface 14a is set to be smaller than the vertical distance d2 with respect to a by a predetermined amount. Vertical spacing d3
Is set to be smaller than the above by a predetermined amount.

The control device 20 generates various control signals including a warning signal according to the detection outputs of the first to third limit switches 15a, 15b and 15c.

Next, the operation of the first embodiment will be described.

When the car 1 is present in the lower zone A from the 1st floor to the 10th floor, the zone detecting means 18 detects this and generates a first detection output, and the changing means 19 outputs the first detection output.
The first limit switch 15a is selected based on the detection output of. At this time, the total of the load inside the car 1 and the weight of the tail cord, compensating rope, etc. acting on the car 1,
When the first predetermined value is exceeded, the pawl cam surface 14a comes into contact with and actuates the first limit switch 15a, which causes the first limit switch 15a to generate a detection output. The control device 20 uses the first limit switch 15
When the detection output of a is received, a warning signal or the like is generated based on this, and a warning operation or the like is performed.

When the car 1 is present in the intermediate zone B from the 11th floor to the 20th floor, the zone detecting means 18 detects it and generates a second detection output, and the changing means 19 outputs this second detection output. The second limit switch 15b is selected based on. At this time, if the total of the load in the car 1 and the weight of the tail cord, the compensating rope, etc. acting on the car 1 exceeds a second predetermined value larger than the first predetermined value, the pawl cam surface 14a is Second limit switch 15
It comes into contact with b and actuates it, whereby the second limit switch 15b produces a detection output. Control device 20
Generates a warning signal or the like based on the detection output of the second limit switch 15b and performs a warning operation or the like.

When the car 1 is present in the upper zone C from the 21st floor to the 30th floor, the zone detecting means 18 detects it and generates a third detection output, and the changing means 19 outputs this third detection output. The third limit switch 15c is selected based on. At this time, if the total of the load in the car 1 and the weight of the tail cord, the compensating rope, etc. acting on the car 1 exceeds a third predetermined value larger than the second predetermined value, the pawl cam surface 14a is Third limit switch 15
It abuts and actuates c, which causes the third limit switch 15c to generate a detection output. Control device 20
Generates a warning signal based on the detection output of the third limit switch 15c and performs a warning operation and the like.

The first predetermined value of the first limit switch 15a is influenced by the weight of the tail cord and the compensating rope which act on the car 1 when the car 1 is located at the center position of the lower zone A, that is, on the fifth to sixth floors. To remove the
Similarly, the second and third limit switches 15b, 15
The second predetermined value and the third predetermined value of c also remove the influence of the weight of the tail cord and the compensating rope, etc., which act on the car 1 when the car 1 is located at the center position of the middle and upper zones B and C, respectively. It is prescribed to do. The first predetermined value is set by the vertical distance d1 between the first limit switch 15a and the pawl cam surface 14a. Similarly, the second and third predetermined values are the second and third limit values. The vertical distances d2 and d3 between the switches 15b and 15c and the respective pawl cam surfaces 14a are set.

The changing means 19 is the zone detecting means 1
Limit switches 15a, 15 based on the detection output of 8
b and 15c are selected so that the control device 20 responds only to the detection output of the selected limit switch. For this purpose, for example, inactivating the limit switches other than the selected limit switch. Alternatively, only the detection output of the selected limit switch may be transmitted to the control device 20. In the former case, the power supply to the limit switches other than the selected limit switch can be cut off, and in the latter case, the first, second and third limit switches 15
It is possible to adopt a configuration in which analog switches are connected between the outputs of a, 15b, 15c and the control device 20, and these analog switches are turned on / off by the detection output of the zone detection means 18.

The first embodiment described above uses a plurality of limit switches 15a, 15b, 15c, each having a different predetermined value. However, it is also possible to change the predetermined value for each zone by using one limit switch and adjusting the positional relationship between the limit switch and the pawl cam surface 14a according to each zone.

FIG. 4 shows a second embodiment of the present invention. In the differential transformer 16 which works as a load detector attached to the rope hitch on the car, the car 1 is at the center position of the hoistway. At times, the detected output is calibrated to accurately represent only the load within the car 1. More specifically, the load in the car 1 and the weight of the tail cord or the compensating rope having a predetermined length hanging from the car 1 act on the car 1 at the center of the hoistway. Since the weight of the tail cord and the compensating rope of this predetermined length is known, the differential transformer 1
Considering this known tail cord compensator rope weight, 6 is calibrated so that its detection output only indicates the load within the car 1.

Therefore, the detection output of the differential transformer 16 accurately represents only the load in the car 1 when the car 1 is at the center position of the hoistway, however, the car 1 is more than the center position. When the car 1 is located above, the load in the car 1 is larger than the load in the car 1 due to the increase in the hanging amount of the tail cord and the compensating rope. When the car 1 is located below the center position, the tail The load in the car 1 is smaller than the load in the car 1 by the amount by which the cord or the compensating rope hangs down.

The car position detecting means 21 detects the height position of the car 1 in the hoistway, and detects the deviation amount x of the car 1 from the origin with the center position of the hoistway as the origin. The shift amount x on the upper side is output with a minus sign, and the shift amount x on the lower side from the origin is output with a plus sign.

The correction value calculation means 22 calculates the correction value H from the detection output x of the car position detection means 21 based on the following equation.

H = (Wt + Wc) × x Here, Wt is the unit weight of the tail cord, Wc is the unit weight of the compensator rope, and the output H of the correction value calculating means 22 is as shown in FIG. When the car 1 is at the center position of the hoistway, it becomes zero, and when the car 1 deviates from the center position of the hoistway, it becomes a negative value according to the deviation amount, and conversely, the car 1 becomes the center position of the hoistway. When it is shifted downward, the value becomes a positive value according to the shift amount.

The adder 23 is for correcting the detection output of the differential transformer 16 by the correction value output H of the correction value calculating means 22, and the detection output of the differential transformer 16 and the correction value calculating means 22. The correction value output H and the correction value output H are added to each other to generate an output representing the true load in the car 1. The output of the adder 23 is sent to the control device 20.

Since the correction value calculation means 22 is configured to generate an output H having a negative slope as shown in FIG. 5, in order to correct the detection output of the differential transformer 16 with the correction value output H, addition is performed. The vessel 23 was used. However, if the correction value calculation means 22 is configured to generate an output H having a positive slope, a subtractor will be used instead of the adder 23.

In the present embodiment, the center of the hoistway is set to the origin for simplification of the construction. However, the origin can be selected at any height of the hoistway.

Next, a third embodiment of the present invention will be described.

In FIG. 6, the differential transformer 16 is attached to the rope hitch on the car. Another differential transformer 24 is attached to the rope hitch portion of the counterweight 5 of FIG. The adder 25 adds the detection output of the differential transformer 16 and the detection output of the differential transformer 24. Differential transformer 16
7 is a positive proportional straight line like the straight line L1 of FIG. 7, and the detection output e2 of the differential transformer 24 is the straight line L1 of FIG.
It is a negative proportional straight line like 2. The adder 25 represents the true load in the car 1 from which the influence of the weight of the tail cord and the compensator is removed.

[0047]

As is apparent from the above description, claim 1
According to the invention described in (1), the hoistway is divided into a plurality of zones in the vertical direction, the zone detecting means for detecting which zone of the plurality of zones the car is located, and the zone detected by the zone detecting means. On the basis of the above, there is provided a changing means for changing the size of the predetermined value so that the higher the position of the detection zone is, the larger the predetermined value of the limit switch means becomes. Even if the weight varies depending on the height of the car,
Since the changing means changes the size of the predetermined value accordingly, the load in the car can be detected with high accuracy without being affected by the weight of the tail cord, the compensating rope, and the like.

According to the invention described in claim 4, the car position detecting means for detecting the height position of the car in the hoistway and the detection output of the load detecting means are corrected by the detection output of the car position detecting means. Since the correction means is provided, even if the weight of the tail cord, the compensating rope, or the like that acts on the car differs depending on the height position of the car, the correction means corrects the detection output of the load detection means accordingly. The load in the car can be detected with high accuracy without being affected by the weight of the tail cord, the compensating rope, and the like.

According to the sixth aspect of the present invention, it is provided with the weight detecting means for detecting the load of the elevator counterweight, and the correcting means for correcting the detection output of the load detecting means by the detection output of the weight detecting means. Therefore, even if the weight of the tail cord or compensating rope acting on the car varies depending on the height position of the car, the correction means corrects the detection output of the load detection means accordingly. The load inside the car can be detected with high accuracy without being affected by the weight of the rope or the like.

[Brief description of drawings]

FIG. 1 is a glock diagram schematically showing a first embodiment of a load detecting device for a rope-type elevator according to the present invention.

FIG. 2 is a schematic diagram showing a state in which the elevator hoistway of the first embodiment is divided into a plurality of zones.

FIG. 3 is a front view showing the relationship between the three limit switches and the cam surface of the first embodiment.

FIG. 4 is a glock diagram schematically showing a second embodiment of the load detecting device for the rope-type elevator according to the present invention.

FIG. 5 is a graph showing the output of the correction value calculation means of the second embodiment.

FIG. 6 is a glock diagram schematically showing a third embodiment of the rope-type elevator load detection device according to the present invention.

FIG. 7 is a graph showing outputs of two differential transformers according to the third embodiment.

FIG. 8 is a sectional view showing a structure of a general rope type elevator.

FIG. 9 is a plan view showing in detail the structure of the rope hitch part on the car of FIG.

FIG. 10 is a front view showing in detail the structure of a rope hitch portion on the car in FIG.

FIG. 11 is a front view showing a part of FIG. 10 in an enlarged manner.

FIG. 12 is a graph for explaining a limit switch detection operation.

FIG. 13 is a front view showing a differential transformer installed in a rope hitch portion on a car.

FIG. 14 is a circuit diagram showing a circuit configuration of a differential transformer.

FIG. 15 is a schematic diagram schematically showing a load acting on a car.

[Explanation of symbols]

 1 car 2 car rope hitch part 15a limit switch 15b limit switch 15c limit switch 18 zone detecting means 19 changing means 21 car position detecting means 22,23 correcting means 24 weight detecting means 25 correcting means

Claims (7)

[Claims] 1. A car floor is a single floor and is used in a rope type elevator having a roping of 1: 1 and is provided in a rope hitch part above the car of the elevator, and a load inside the car exceeds a predetermined value. In a load detecting device for a rope-type elevator having limit switch means for detecting that, the hoistway is divided into a plurality of zones in the vertical direction, and a zone for detecting in which zone of the plurality of zones the car is located And a changing means for changing the magnitude of the predetermined value based on the zone detected by the zone detecting means such that the higher the position of the detection zone is, the larger the predetermined value of the limit switch means becomes. A load detecting device for a rope-type elevator, which is characterized by: 2. The limit switch means includes a plurality of limit switches corresponding to the number of the zones, each of the plurality of limit switches having a predetermined value having a different size, and the changing means includes the zone detecting means. The load detection device for a rope type elevator according to claim 1, wherein the predetermined value is changed by selecting the limit switch according to the detection output of the means. 3. The limit value of the limit switch means is variable, and the changing means changes the predetermined value of the variable on the basis of the zone detected by the zone detecting means. The load detection device for the rope type elevator described. 4. A load detecting means for use in a rope-type elevator having a single-floor car floor and a roping of 1: 1 and provided in a rope hitch part on the car of the elevator to detect a load in the car. In a load detecting device for a rope type elevator including: a car position detecting means for detecting a height position of the car in the hoistway; and a detection output of the load detecting means is corrected by a detection output of the car position detecting means. A rope-type elevator load detection device comprising a correction means. 5. The load detecting means is a differential transformer, and the correcting means generates a correction value related to the height position of the car based on the detection output of the car position detecting means. The load detection device for a rope type elevator according to claim 4, further comprising: a calculation unit configured to calculate a detection output of the load detection unit and a correction value of the correction value generation unit. 6. A load detecting means for use in a rope-type elevator having a single-floor car floor and a roping of 1: 1 and provided in a rope hitch portion above the car of the elevator to detect a load in the car. A load detecting device for a rope type elevator comprising: a weight detecting means for detecting a load of a counterweight of the elevator; and a correcting means for correcting a detection output of the load detecting means by a detection output of the weight detecting means. A load detecting device for a rope-type elevator, which is characterized by: 7. The load detection device for a rope type elevator according to claim 6, wherein the correction means adds the load detected by the load detection means and the load detected by the weight detection means.