JPH03192079A - Controller for hydraulic elevator - Google Patents

Abstract

PURPOSE:To improve the safety by driving a hydraulic pump by a prescribed driving pattern and installing a speed control means for controlling the drive of a hydraulic pump when the output of the first hydraulic pressure detection part or the second hydraulic pressure detection part or the difference between both exceeds each prescribed range. CONSTITUTION:The first hydraulic pressure detecting part 12 which is connected with a hydraulic jack 3 which vertically raises and lowers a cage 2 in an elevator passage 1 and arranged in a conduit for feeding the pressurized oil and detects the hydraulic pressure on the cage load side and the second hydraulic pressure detecting part 13 which is connected with a hydraulic pump 9 and detects the hydraulic pressure on the discharge side of the pump 9 are provided. Further, a speed control means 27 which drives the pump 9 in a prescribed driving pattern and suspends the drive of the pump 9 when the output of the driving part 12 or 13 or the difference between both exceeds a prescribed range is provided. Accordingly, discharge pressure on the pump 9 side and the pressure on the cage 2 side are detected, and each normal range in each operation mode is set for each pressure and the differential pressure between both, and when this range is exceeded, a three phase electric inductive motor 6 is put into cut-off state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elevator control device, and particularly to a hydraulic elevator control device that hydraulically drives the elevator.

[Prior Art] As a conventional control device for this type of hydraulic elevator, there is a technique disclosed in Japanese Patent Laid-Open No. 57-98477.

FIG. 8 is an overall configuration diagram showing a conventional hydraulic elevator control device.

In the figure, (2) is the elevator car, (3) is a hydraulic jack that moves the elevator car (2) up and down with a plunger (4), and (5a) is the hydraulic jack (3).
This oil is supplied as pressure oil (5) to the

(71) is an AC motor that is driven by applying an AC power source (not shown); (72) is the AC motor (
The oil (5a) is driven by the relief valve (73).
) is a hydraulic pump that sends pressure oil (5) to the flow control valve (74) through the flow control valve (74). Moreover, the flow control valve (74)
The inflowing pressure oil (5) is sent out to the hydraulic jack (3) or the oil tank (75) in a switchable manner.

Next, the operation of the conventional hydraulic elevator control device configured as described above will be explained.

When the elevator car (2) is called to ascend, AC power is applied to drive the AC motor (71), which rotates the hydraulic pump (72) and pumps the oil (5a) in the oil tank (75). The pressure oil (5) is sent to the flow control valve (74) via the relief valve (73). At this time, the flow control valve (74) is opened on the oil tank (75) side, and the pressure oil (5) is returned to the oil tank (75). Therefore, the pressure oil (5) is transferred from the oil tank (75) to the hydraulic pump (7
2), a relief valve (73), and a flow control valve (74)
) and returns to the oil tank (75), resulting in an idling state. In the idling state, the flow rate control valve (74) gradually closes the oil tank side, so that the hydraulic jack (3) side opens.

Therefore, the pressure oil (5) flows into the hydraulic jack (3) and the elevator car (2) starts to rise. Furthermore,
When the flow control valve (74) is fully closed on the oil tank side and fully opened to the hydraulic jack (3), the entire amount of pressure oil (5) delivered by the hydraulic pump (72) is transferred to the hydraulic jack (3). flows into. For this reason, the elevator car (2
) is driven at a constant rate of rise.

When the elevator car (2) approaches the floor where it stops, the flow rate control valve (74) gradually opens the oil tank side.
The fully open state for the hydraulic jack (3) is gradually closed. Therefore, the amount of pressure oil (5) flowing into the hydraulic jack (3) gradually decreases. Therefore, the elevator car (2) gradually reduces its speed, and when the floor to be stopped and the floor of the elevator car (2) reach a predetermined position, the flow rate control valve (74) is activated so that the oil tank side is completely closed. The hydraulic jack (3) side is fully opened and the elevator car (2) stops.

When the elevator car (2) descends, the AC motor (71) is not driven, and the flow control valve (74) operates to release the hydraulic jack (3) from closing. Therefore, due to the weight of the elevator car (2), etc., the pressure oil (5) in the hydraulic jack (3) flows out into the oil tank (75). Therefore, the elevator car (2) descends under its own weight.

In addition, as mentioned above, when the hydraulic elevator is being driven, if the pressure inside the pipe line becomes abnormally high, the relief valve (73) operates and releases the pressure oil from the pipe line's internal pressure to the oil tank. is opened to lower the pressure, and the AC motor (71
) or prevent failure of control equipment such as the hydraulic pump (72) and maintain safe operation of the hydraulic elevator.

On the other hand, as a technique that improves the above conventional example, the car is not controlled by the flow rate control valve (74), and the AC motor (71)
By varying the voltage and frequency of the power source that drives the AC motor (71) and changing the rotation speed and driving direction of the AC motor (71),
The method of controlling the hydraulic elevator is used.

That is, by controlling the rotation speed of the hydraulic pump (3) by the AC motor (71), the moving speed of the elevator car (2) is controlled, and by controlling the rotation direction, the hydraulic jack is controlled. (3) Pressure oil (5
) by controlling the inflow or discharge of the elevator car (2).
The direction of movement is controlled.

[Problems to be Solved by the Invention] Since the conventional elevator control device is configured as described above, it is necessary to cause the pressure oil (5) to flow in and out of the hydraulic jack (3) using the hydraulic pump (72). This controls the raising and lowering of the elevator car (2), and when the hydraulic pressure increases abnormally, the safe operation of the hydraulic elevator is maintained by operating the relief valve (73).

However, in the conventional hydraulic elevator control device described above, the relief valve (73) is activated when the oil pressure of the pipe through which the pressure oil (5) is fed reaches a set value. At this time, the flow rate control valve (74) or the relief valve (73)
) The pressure oil passage (5) becomes narrow due to its own failure, etc.
In cases where the resistance to fluid passage gradually increases, the AC motor (71) is operated by a hydraulic pump (72) with a large load.
) must continue to rotate, and the hydraulic pump (72
), or the life of the AC motor (71) could be shortened.

In addition, in the technique of improving the conventional example, the AC motor (
Since the hydraulic pump (72) is reversely rotated by the hydraulic pump (71) to lower the elevator car (2), if a failure similar to the conventional example occurs, the hydraulic pump (72) is reversely rotated by the hydraulic pump (71).
), the internal pressure of the pipe line decreased to negative pressure, and there was a possibility that the pipe line would generate abnormal noise and be damaged.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a highly safe and economical control device for a hydraulic elevator that can promptly deal with any abnormality that occurs in each device installed in a pressure oil pipeline. It is something.

[Means for Solving the Problems] A control device for a hydraulic elevator according to the present invention includes a first hydraulic pressure disposed on the side of a hydraulic jack that moves up and down an elevator car in a hoistway to detect a hydraulic pressure on a car load side. a second hydraulic pressure detection section that is connected to the hydraulic pump that sends pressure oil to the hydraulic jack and detects the hydraulic pressure on the discharge side of the hydraulic pump; The hydraulic pump comprises a speed control means for controlling the drive of the hydraulic pump when the output of the first oil pressure detection section or the second oil pressure detection section or the difference between the two exceeds a predetermined range.

[Function] In the present invention, the first hydraulic pressure detection section is connected to a hydraulic jack that moves up and down the elevator car in the hoistway, and is installed in a conduit that supplies pressure oil, and detects the hydraulic pressure on the car load side. , a second oil pressure detection section detects the oil pressure on the discharge side of the hydraulic pump.

Then, the hydraulic pump is driven using a predetermined pattern to control movement of the elevator car.

Further, an abnormality is determined by comparing the output of the first oil pressure detection section or the second oil pressure detection section or the difference between the two with a preset range.

[Example] The present invention will be explained in detail below.

FIG. 1 is an overall configuration diagram showing a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing speed control means of a hydraulic elevator control device according to an embodiment of the present invention. It is. Furthermore, FIGS. 4 and 5 are explanatory diagrams of control patterns for controlling a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. FIG. 7 is an explanatory diagram of the outputs of the first oil pressure detection section and the second oil pressure detection section of the control device for the hydraulic elevator, and the timing relationships thereof are the same as in FIG. 6 and FIG. 4, and FIG. 7 and FIG. 5, respectively. In addition, in the figure, the same reference numerals and symbols as the conventional example are as follows.
This figure shows the same or equivalent parts as those of the conventional example.

In Figure 1, (1) is the elevator hoistway, (2)
is the elevator car, (3) is the hydraulic jack, (4) is the plunger, (5) is the pressure oil, (6) is the three-phase induction motor, (
7) is a hydraulic pump, and (8) is an oil tank.

(9) is an electromagnetic switching valve disposed between the hydraulic jack (3) and the hydraulic pump (7). This electromagnetic switching valve (9) has a direction that prevents the flow of the pressure oil (5) in the opposite direction;
That is, it has a function of switching the direction of the check.

(11) is the electromagnetic switching valve (9) and the hydraulic jack (3)
The pipe (12) connecting the pipe (12) is a first oil pressure detection unit that detects the oil pressure attached to the pipe (11). This first oil pressure detection section (12) detects the oil pressure flowing into or out of the load side of the elevator, that is, the hydraulic jack (3). (13) is the first hydraulic pressure detection section (
This is a second oil pressure detection section having the same function as 12). This second oil pressure detection section (13) detects the oil pressure of pressure oil (5) discharged from the hydraulic pump (7). (14) is a rope (
15) is stretched and detects the ascending and descending speed of the elevator car (2) using the rope (15).

(16) is an oil temperature detection section that detects the temperature of oil in the oil tank (8).

(21) is a rectifier composed of a rectifier such as a silicon rectifier that rectifies three-phase alternating current "R, S, T" into direct current;
2) is a smoothing capacitor that smoothes the power rectified by the rectifier (21), and (23) is the smoothing capacitor (22).
The inverter (24) converts the power smoothed by the inverter (23) into a three-phase AC voltage having a required frequency by closing the inverter (24) to convert the three-phase AC voltage converted by the inverter (23) into the three-phase induction motor ( 6) Relay (25) connected to
is a speed detector generated by driving the three-phase induction motor (6). This speed detector (25) generates an output voltage proportional to the rotational speed. (26) is connected to the output side of the rectifier (21), converts the rectified DC output into 1 AC again, and adds it to the input side of the rectifier (21);
This is a regenerative inverter that regenerates electric power.

(27) are the output signals (12a) and (13a) of the first oil pressure detection unit (12) and the second oil pressure detection unit (13);
A car speed signal (14a) of a car speed detection section (14);
An oil temperature signal (16a) of the oil temperature detection section (16), a voltage output (25a) proportional to the rotation speed of the speed detector (25),
Operation signal (30da) generated by a normally open contact (30d) that is closed from when a start command is issued until a stop command is issued.
are the speed control means to which each is input. This speed control means (27) outputs a control signal (27a) to perform variable control of the frequency of the three-phase AC output from the inverter (23). Further, the speed control means (27) controls the closing of the relay (24) using a control signal (24a) to control the start of driving of the three-phase induction motor (6). The speed control means (27) controls the output frequency of the inverter (23) and the drive rotation speed of the three-phase induction motor (6) according to a plurality of set control patterns. Therefore, the elevator car (2)
moves up and down according to the control pattern of the speed control means (27).

In FIG. 2, (38) is the first oil pressure detection section (13).
) is almost equal to the output value (12a) of the second oil pressure detection section (12), the stop pattern generation circuit' (39) outputs the signal shown in FIG. 4(d) or FIG. 5(d).
This is a switching circuit consisting of a comparison circuit, etc., which holds the pattern value as it is, as shown in FIG. Further, the stop pattern generating circuit (39) is a stop pattern generating circuit that holds the elevator car (2) in a stopped state at each floor. This stop pattern generation circuit (39) compensates for the descent of the elevator car (2) due to leakage of the pump in the hydraulic system circuit, etc.
The elevator car (2) is stopped at a fixed position.

(40) is a floor alignment command circuit that generates a speed signal corresponding to the position when the car deviates from the normal stop position, and when the stop command signal (10a) generates an "L" output, NOT
The gate (43) outputs "H" and issues a command when the output signal (56a) of the position generation signal (56) generates an output corresponding to a predetermined floor deviation. (
41U) is a 2-up pattern generation circuit which outputs the up-up pattern signal shown in FIG. 4(b). This - rising pattern generation circuit (41U) is as shown in Fig. 4<b).
This outputs a control pattern when the elevator car (2) is raised. As shown in FIG. 5(b), (41D) is a descending pattern generating circuit that outputs a control pattern when the elevator car (2) descends, similar to the ascending pattern generating circuit (41U); Generation circuit (
41U) and the descending pattern generation circuit (41D) are closed from when a deceleration command signal (9a) and a stop command signal (10a) obtained as known elevator control signals and a start command are issued until a stop command is issued. Normally open contact (30d
) is input the operating signal (30 da) generated. (45U) is a rising floor alignment pattern generating circuit for controlling the car position of the elevator car (2) when it floats as shown in FIG. 4(C), and (45D) is the rising floor platform shown in FIG. 5(c). This is a descending floor alignment pattern generation circuit that controls the car position during subsidence, similar to the alignment pattern generation circuit (45U), and corresponds to the above-mentioned (41U) and (41D). When a normal call operation command (30da) is generated, the output of the NOT gate (44) becomes "L", so
(45U) and (45D) are not output. therefore,
(41U), (4ID) and (45U), (45
Patterns D) do not occur simultaneously. (41Ua
) is a rising operation switch that remains closed during the rising operation, (41
Da) is the descending operation switch that remains closed during descending operation, (41Ub) is the stop operation switch that remains closed when commanding floor alignment during stop and ascent, (41Db) is the floor alignment command during stop and descent. These are switching signals available as known elevator control signals. (46) is the upward operation switch (41Ua) and the downward operation switch (41Da).
), the stop operation switch (41Ub), the stop operation switch (41Db), and the required control patterns generated from the pattern generation circuits (41U) and (41D) selected by the stop operation switch (41Db) and the stop holding pattern generation circuit (39). , is a pattern summation circuit that outputs a combined pattern as a result of the summation.

(47) is a signal conversion circuit that converts the speed signal (14a) detected by the car speed detection section (14) into a predetermined signal level for feedback control; (48) is the signal conversion circuit (
47) and the output of the comparison and addition circuit (55), and outputs the difference. (49) is an amplifier circuit that amplifies the output of the comparison/subtraction circuit (48) to a predetermined value;
(50) is the amplifier circuit (49) and the signal conversion circuit (47).
) A speed frequency generation circuit that outputs a frequency proportional to the speed to which the elevator car speed signal converted by (
51) is a voltage conversion circuit that converts the output signal of the speed frequency generation circuit (50) into a voltage that increases or decreases linearly according to the speed frequency; 50), which outputs a control signal (27a) for controlling the inverter (25 6 3). (53) is the car position detection section (1
4) A signal conversion circuit that converts the car speed signal (14a) output to a predetermined signal level, (54) converts the output of the signal conversion circuit (53) and the output of the rising pattern generation circuit (41U) or (41D). A comparison and subtraction circuit (55) is a comparison and addition circuit that adds the outputs of the comparison and subtraction circuit (54) and the pattern summing section (46). Further, this comparison and addition circuit (55) is connected to the comparison and subtraction circuit (55).
4) Or by the output of the pattern summation circuit (46),
The electromagnetic switching valve (9) is operated, and the relay (24) is also operated, and the normally open contacts (24A) to
(24C) is closed. (56) integrates the output of the signal conversion circuit (53) and calculates the car position signal (5
6a) and outputs it to the floor alignment command circuit (40).

In FIG. 3, (60) corresponds to the rising and descending patterns of the first hydraulic pressure detection section (12), as shown as (12as) in FIG. 6(a) or FIG. 7(a). A reference signal setting circuit that sets and outputs a reference signal to be compared with the output (12a), (61) is shown in FIG. 6(b) or 7.
As shown in Figure (b), the output (12a) of the first oil pressure detection section (12) and the output (13) of the second oil pressure detection section (13)
(62) is a reference signal setting circuit that outputs a reference signal to be compared with the differential pressure pattern with (a).
As shown as (13as) in FIG. be. (63) is the reference signal setting circuit (
Similar to the comparison circuit (63), the comparison circuit (64) compares the reference signal outputted by the reference signal output from the first oil pressure detection section (12) with the output (12a) of the first oil pressure detection section (12).
) and the outputs of the first oil pressure detection section and the second oil pressure detection section. (65) is a comparison circuit that compares the output (13a) of the second oil pressure detection section (13) and the output of the reference signal setting circuit (62).

In addition, each of the comparison circuits (63), (64) and (65)
When the comparison result exceeds the reference value range, the signal “H” is output.
” to the NOR gate (66). (6
7) is the NOR gate (66) and the comparison and addition circuit (5).
5) is an AND gate that is turned on when the output signal (55a) is equal to or higher than a predetermined value.

Next, the operation of the hydraulic elevator control device of this embodiment configured as described above will be explained.

First, the general operation of the hydraulic elevator control device of this embodiment will be explained.

When the elevator car (2) is called by a user on a floor, the relay (24) is closed and the inverter (23
) is applied to the three-phase induction motor (6). For this reason,
The three-phase induction motor (6) is driven according to the voltage and frequency output by the inverter (23), and is driven by the hydraulic pump (7).
) at a predetermined rotation speed and rotation direction. In the case of raising the elevator car (2), pressure oil (5) is sent to the hydraulic jack (3) to extend the plunger (4), and conversely,
When the elevator car (2) is lowered, the pressure oil (5) is discharged from the hydraulic jack (3) and the plunger (4) is lowered.
) to move the elevator car (2) up and down.

Specifically, when an elevator car call occurs on the second floor, the ascending operation switch (41Ua) closes, and the ascending pattern generating circuit (41U) generates the ascending pattern shown in FIG. 4(a). It is output to the comparison and addition circuit (55) via the summation circuit (46). The comparison and addition circuit (55
) outputs a signal (55a) to the AND gate (67) in response to the signal input from the rising pattern generation circuit (41U), that is, the rising pattern signal.

On the other hand, since the rising pattern generation circuit (41U) outputs the signal shown in FIG. 4(a) to the reference signal setting circuit (61), the reference signal setting circuit (61) uses the reference pressure cover pattern as ). Then, in the comparison circuit (63), the output (1
2a) compared with 90. At this time, as shown in FIGS. 4(a) and 4(b), since the hydraulic pump (7) is not yet driven, the hydraulic pressure detected by the first hydraulic pressure detection section (12) is close to zero. . Therefore, since the comparison circuit (63) outputs a signal "L", the NOR gate (67) is turned on and outputs a signal to the AND gate (68). For this reason,
The AND gate (68) is turned on, and the relay (
24) operates to close the normally open contacts (24A) to (24C). Therefore, the three-phase induction motor (6) starts driving upon receiving the output of the inverter (23), and the hydraulic pump (
7) to start raising the elevator car (2). At this time, the inverter (23) follows the rising pattern and increases the frequency of the output voltage, so that the speed of the elevator car (2) becomes as shown in FIG. 4(b).

Since the three-phase induction motor (6) changes its rotation speed and rotation direction according to changes in the frequency of the input voltage, the hydraulic pump (7) rotates the pressure oil (5) along the rising pattern. ) to increase the oil supply amount. For this reason,
The elevator car (2) continues the second part at a moving speed that follows the ascending pattern. In addition, the three-phase induction motor (6
) is detected by a speed detector (25) and passed through a signal conversion circuit (47) to the comparison and subtraction circuit (4).
8) and is fed back to the speed frequency generation circuit (50). Note that during this period, the output (12) of the first oil pressure detection section (12)
a) and the output (13a) of the second oil pressure detection section (13) is the sixth
In addition to the rising pattern shown in Figure (a), the difference between the output (12a) of the first oil pressure detection section (12) and the output (13a) of the second oil pressure detection section (13) is shown in Fig. 6 (b). It becomes a pattern.

Next, the descending operation will be described.

When descending, the car speed pattern is as shown in FIG. 5(a), which is the opposite of when ascending in FIG. 4(a), so the three-phase induction motor (6)
After rotating in the normal direction, the elevator car (2) is rotated in the reverse direction, and the elevator car (2) is controlled as shown in FIG. The output (12a) of the first oil pressure detection section (12) and the output (13a) of the second oil pressure detection section (13) during this period are shown in FIG. 7(a).
), the first oil pressure detection section (12
) output (12a) and the output (13) of the second hydraulic pressure detection part (
The difference from 13a) results in the pattern shown in FIG. 7(b).

Next, stopping will be explained.

When the elevator car (2) reaches the normal stop position, the stop command signal (10a) becomes "L", and the ascending operation switch (41Ua) and descending operation switch (41Da) are opened, thereby causing the ascending pattern generation circuit ( 41U) and the falling pattern generation circuit (41D) become zero. At the same time, the output of the inverting circuit (43) becomes "H", so the rising floor matching pattern generating circuit (45U) and the falling floor matching pattern generating circuit (45D) output the position signal (56a) from the position signal generating circuit (56). ) corresponding to the rising floor matching pattern that controls floor stopping during ascending as shown in FIG. 4(C) or the descending floor matching pattern that controls floor stopping during descending shown in FIG. 5(c). Generate a pattern. At this time,
Since either the stop operation switch 3 (41Ub) or the stop operation switch (41Db) is closed, the elevator car (2) will stop according to the floor deceleration pattern of the traveling position.

When the floor reaches a minute range from the normal stopping position, the speed accuracy of the elevator car (2) becomes a problem, and the elevator car (
2) speed becomes zero speed, and the stop operation switch (41U
b), the stop operation switch (41Db) is also opened. However, since the stop pattern generation circuit (39) generates a predetermined pattern to maintain the stopped state of the elevator car (2), the three-phase induction motor (6) rotates at a low speed and the leakage amount is divided equally between the phases. is corrected to hold the elevator car (2) in a predetermined position.

Next, floor alignment will be explained.

Now, if the floor of the elevator car (2) sinks due to some reason, such as oil leakage or movement of passengers, and exceeds a minute range, the car position signal (56a) is sent from the position signal generation circuit (56). The pattern shown in FIG. 5(c) is generated by the descending floor matching pattern generation circuit (45D) by outputting the car position signal (56a).
arises from. At the same time, stop operation switch (41Db)
The elevator car (2) is also closed, and the elevator car (2) is brought together with a speed pattern that matches the current position of the elevator car (2).

In this case as well, the rising floor alignment pattern generation circuit (45
U) or the descending floor alignment pattern generation circuit (45D) is input to the reference signal setting circuits (60) to (62), so
A predetermined pressure range is set according to the operating mode, and compared by comparison circuits (63) to (65), and if the pressure is within a normal range, the three-phase induction motor (6) will not be shut off.

Next, a case of abnormality will be explained.

Assume that there is a call in the upward direction and a start command is issued, but for some reason, for example, the check valve (9) does not open.

At this time, the three-phase induction motor (6) is driven in the same manner as shown in Fig. 4(a), and the hydraulic pump (7) discharges oil, but since it is blocked by the check valve (9), the hydraulic pump (7) discharges oil. Two oil pressure detection parts (13)
The output signal (13a) rises as shown in FIG. 6(C), which corresponds to the reference output signal (13a) of the second oil pressure detection section
As), the comparator circuit (65) outputs "H'" between times t00 and tO1, and the relay (
24) is demagnetized and becomes a normally open contact (24A) to (24C)
is opened, the three-phase induction motor (6) is stopped, and furthermore, the pressure in the second hydraulic pressure detection section (13) is prevented from increasing.

Furthermore, the comparison circuit (64) is not as shown in FIG. 6(b),
Since it becomes negative between times t00 and tO1, an "H" output is generated, and an abnormality can be checked in the same way as above.

Next, there is one call in the downward direction, and the three-phase induction motor (6)
When the is reversed, the hydraulic pump (7) is also reversed, and as shown in Fig. 7 (
As shown in C), the discharge side of the hydraulic pump (7) becomes negative pressure (negative pressure). In this case, the output signal (13a) of the second oil pressure detection section (13) in FIG. 5(a) is from tll to t12.
Since the comparator circuit (65) goes out of the normal range between
Similarly, the relay (24) is demagnetized to open the normally open contacts (24A') to (24C), the three-phase induction motor (6) is stopped, and the hydraulic pump (7) is turned on with negative pressure. ) can be prevented from being damaged.

In this way, the hydraulic elevator control device of this embodiment is
A first oil pressure detection unit is connected to a hydraulic jack (3) that raises and lowers an elevator car (2) in a hoistway (1) and is installed in a conduit that supplies pressure oil to detect oil pressure on the car load side. (12), and a second hydraulic pressure detection section (13) connected to the hydraulic pump (9) that sends pressure oil to the hydraulic jack (3) to detect the hydraulic pressure on the discharge side of the hydraulic pump (9). , the hydraulic pump (9) is driven in a predetermined drive pattern, and the first hydraulic pressure detection section (12) or the second hydraulic pressure detection section (13
) speed control means (
27).

Therefore, in this embodiment, the discharge pressure on the hydraulic pump (9) side and the pressure on the elevator car (2) side are detected, and a normal range is set for each operating mode for each pressure and the differential pressure between the two, and When this happens, the three-phase induction motor (6) is cut off, so the abnormality can be detected early, and damage such as damage to equipment can be suppressed or eliminated.

In the above embodiment, the upper limit side of the pressure range has been described, but it is also possible to set it to the lower limit side and the same effect can be obtained.

[Effects of the Invention] As described above, the hydraulic elevator control device of the present invention has the following effects:
A first hydraulic pressure detection section that is connected to a hydraulic jack that ascends and descends the elevator car in the hoistway and that supplies pressure oil, and that detects hydraulic pressure on the car load side; a second hydraulic pressure detection section that is connected to a hydraulic pump that delivers pressure oil and detects the hydraulic pressure on the discharge side of the hydraulic pump; and a second hydraulic pressure detection section that drives the hydraulic pump in a predetermined drive pattern, A speed control means is provided for controlling the drive of the hydraulic pump when the output of the two hydraulic pressure detection parts exceeds a predetermined range.

Therefore, the first hydraulic pressure detection section detects the hydraulic pressure on the car load side, which is connected to the hydraulic jack that raises and lowers the Elm 7 Beta car in the hoistway and is connected to a conduit that supplies pressure oil. The oil pressure detection unit detects the oil pressure on the discharge side of the hydraulic pump, and the output of the first oil pressure detection unit or the second oil pressure detection unit or the difference between the two is compared with a preset range, and a predetermined normal state is detected. Since the speed control means controls the drive of the hydraulic pump when the drive pattern goes out of range, it is possible to quickly respond to any abnormalities that occur in the equipment installed in the pressure oil pipes. . In addition, it is highly safe because the outputs of the first oil pressure detection section and the second oil pressure detection section can be used for abnormality determination, and it is also economical because damage such as damage to various equipment can be suppressed. .

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing speed control means of a hydraulic elevator control device according to an embodiment of the present invention. , FIGS. 4 and 5 are explanatory diagrams of control patterns for controlling a hydraulic elevator control device according to an embodiment of the present invention, and FIGS. 6 and 7 are illustrations of control patterns for controlling a hydraulic elevator according to an embodiment of the present invention. An explanatory diagram of the outputs of the first oil pressure detection section and the second oil pressure detection section of the device, and FIG. 8 is an overall configuration diagram showing a conventional hydraulic elevator control device. In the figure, 1: Hoistway 2: Elevator car 3: Hydraulic jack 9: Hydraulic pump 12: First oil pressure detection section 13: Second oil pressure detection section 27: Speed control means. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A hydraulic jack that raises and lowers an elevator car in a hoistway; a hydraulic pump that sends pressure oil to the hydraulic jack; and a hydraulic pump that is connected to the hydraulic jack and detects hydraulic pressure on the car load side. a first hydraulic pressure detection section; a second hydraulic pressure detection section that detects the hydraulic pressure on the discharge side of the hydraulic pump; and a second hydraulic pressure detection section that drives the hydraulic pump in a predetermined drive pattern, A control device for a hydraulic elevator, comprising: speed control means for controlling driving of the hydraulic pump when the output or the difference between the two exceeds a predetermined range.