JPS60213680A - Fluid pressure elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention is directed to raising or lowering a plunger by supplying or discharging pressure fluid to or from a hydraulic ram, and to connect a passenger directly or directly to the plunger. relates to a hydraulic elevator of the type that is indirectly coupled to raise or lower.

[Background of the invention]

In the flow control valve used in this type of fluid pressure Elm and Beta, a large number of restricting resistors are installed in the pilot circuit that controls the main control valve, and the flow rate is controlled by operating the main control valve according to a preset sequence. I was in control. However, as the pressure acting on the working fluid and the fluid temperature change, the fluid resistance of the throttle 9 portion that controls the operation of the three control cells changes, resulting in a loss of controllability.

[Purpose of the invention]

The present invention provides a high-performance fluid pressure elevator equipped with a flow control valve that exhibits constant controllability even when fluid pressure or fluid temperature changes. For flow control valves used in pressure elevators, the fluid passage area in the pilot valve provided in the pilot circuit that controls the operation of the main control valve is calculated based on the load condition of the control valve, that is, the fluid pressure or fluid flow. This is made variable according to the temperature, so that the flow rate control characteristics of the main control valve do not fluctuate depending on load conditions.

[Example of invention]

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a fluid pressure levator. In the hydraulic elevator, the speed of the plunger 104 is controlled by controlling the pressure fluid supplied to or from the hydraulic ram 102 . The seat 101 is connected directly or indirectly to the top of the plunger to raise or lower the seat. The figure shows an indirect type case, in which a pulley 1()5 and a rope 106' are provided at the top of the plunger 104. r: This is a method of driving the seat 101 through the vehicle. The flow control valve 1 allows high pressure fluid flow from the fluid pressure source 103 to the fluid pressure source 102 - or from the fluid I tram 1-02 to the fluid pressure source 1
03 respectively.

FIG. 2 is a sectional view showing details Iv40 of the flow control valve 1 in the present invention. The 3P body 2 includes a rise control valve 10 for upper row speed control. 5. A lowering control valve 30 for controlling the lowering speed; tank boat 6
A cylinder boat 7, etc., which communicates with the hydraulic cylinder and the hydraulic cylinder are provided.

The rise control valve 10 has a flow path 81 connected to the pump boat 5.
A fluid chamber 16° provided in the valve body 2 is provided between the valve body 2 and the flow path 82a leading to the tank bow 1. The fluid chamber 16 is comprised of a poppet 11, a spring 14, and the like. Po (8) Pet 11 has a skirt part 12. It has a notch 13 provided in the skirt portion. The poppet 11 is constantly pushed upward by a spring 14, and communicates between the two channels 81a and 82a through the notch 13 provided in the skirt portion 12 and the fluid chamber 16. When pressure fluid is supplied, the poppet 11 is pushed downward, reducing the communication area of the notch 13 and finally sealing it. Stopper 15
limits the normal position of the poppet 11 and sets the communication area of the notch 13 at this time.

The rise pilot valves 40 and 50 control the fluid pressure in the pressure chamber 17 of the rise control valve 10. The first pilot valve 40 for rising is provided between the flow path 81a and the pressure chamber 17, and is connected to the flow path 84.
, 85a are normally closed valves. The second ascending pilot valve 50 is provided between the pressure chamber 17 and the tank boat 6, communicates with each other through channels 85a and 86, and is a normally open valve. These pilot valves 40.50 are operated by springs 42, 52 that push the valve bodies 41, 51.5f' and solenoids 43, 53, (
4) The solenoid is driven by a pulse train signal.

These valves are provided in the pilot body 3.

The descending control valve 30 is provided between the fluid pressure boat 7 and the tank boat 6, and is connected to a fluid chamber 36 provided in the box body 2,
-31 and springs 34 etc. The poppet 31 has a skirt portion 32. It has a notch 33 provided in the skirt portion. The poppet 31 is always pushed downward by the spring 34 and the fluid pressure acting on the pressure chamber 37 above the poppet, and when the LE pressure fluid in the pressure chamber 37 is removed, it is pushed upward by the fluid pressure acting on the fluid chamber 36. As a result, the communication area of the notch 33 provided in the skirt portion increases from zero, allowing communication between the cylinder boat 7 and the flow path 821). Stopper 35
limits the amount of movement of the poppet 31 when it moves upward, and sets the communication area of the notch 33.

The lowering pilot valves 60 and 70 control the fluid pressure in the pressure chamber 37 of the lowering control valve 30. Lowering first pilot valve 6
It is a normally open type valve that is provided between a flow path 83 connected to the drain fluid chamber 36 and the pressure chamber 37 and communicated with each other through flow paths 87 and 88a.

The second descending pilot valve 70 is provided between the pressure chamber 37 and the tank boat 6, and communicates with each other through channels 88b and 86.
It is a normally closed type valve. These pilot valves 60.70 have valve bodies 61.71. It consists of springs 62, 72 and solenoids 63, 73 that push the valve body, and is driven by a pulse train signal. These pilot valves are provided in the pilot valve body 4.

The check valve 20 is provided between a flow path 81b connected to the pump port 5 and a flow path 83 connected to the cylinder port 7, and is composed of a poppet 21 and a spring 23.

The poppet 21 has a guide rod 22 and the valve body 2
It is guided by a guide 24 provided at the top and is slidable.

The check box 20 has a structure that prevents completely free flow from the flow path 81b to the flow path 83 and the reverse flow.

The pilot valve solenoid is driven by a pulse signal of a specific frequency and width according to the command. Figure 3 shows solenoid 43. An example of a drive circuit for (53, 63, 73) is shown. At the command generation time N1110, a command corresponding to the elevator operation pattern is generated, and the drive circuit 112 generates a command in the oscillation circuit 111.
A pulse signal train of a width corresponding to the command is generated by comparing the current signal of a specific frequency (No. Drive-1.

The flow ridge control box provided in the fluid pressure elevator of the present invention is
;Since the configuration is as described above, it operates as follows.

First, when the lift 101 is ascending, if the pump of the fluid pressure source 103 is driven, the lift 11 fluid is guided to the pump boat 5 of the flow sewing control 9P 1, and then from the notch 13 in the skirt of the descending control valve 10. It flows out to tank boat 6. When an elevator operating speed pattern is generated from the command circuit, a signal with a pulse width corresponding to the pattern is sent from the drive circuit 112 to the solenoids 43, 53 as described above, and the solenoids are driven.

Therefore, the pressure fluid from the flow path 81a is supplied to the pressure chamber 17 and pushes the poppet 11 downward (7), thereby reducing the communication area of the notch 13 and increasing the fluid pressure in the flow path 81a. Finally, the poppet 21 of the check valve 20 is pushed open, and high-pressure fluid flows into the fluid pressure ram 102 via the cylinder port 7, pushing up the plunger 104 and raising the seat 101. A signal having a pulse width corresponding to the running speed pattern of the fluid elevator is supplied to the pilot valve solenoid 43.53, the pilot valve 40 supplies pressure fluid to the pressure chamber 17, and the pilot valve 50 supplies pressure fluid to the pressure chamber 17. Pressure fluid is discharged from the pressure chamber 17 from the chamber 17 . A fluid chamber 1 is provided in the poppet 11 of the rise control valve 10.
From 6, pressure P1 is in the area of (A2-AI), pressure chamber 1
7, a pressure P2 acts on the area of A2, and a force F=(Az-Ax)Pt-AgF2 acts upward on the poppet. Therefore, by controlling P2, the poppet position, that is, the communication area of the notch 13 can be controlled. When pushing down the poppet 11, the pilot valve 40 supplies pressure fluid to the pressure chamber 17, and in the opposite case, the pilot valve 50 supplies pressure fluid to the pressure chamber 17.
Then, (8) ・Put out the pressure fluid JJi. As a result, the fluid flow rate supplied to the rIIE body pressure ram 102 can be arbitrarily controlled, and the elevator's upward movement can be controlled.

In the case of descending, it is the same as in the case of the upper row.
By increasing the total fluid flow area of the notch 33 provided in the
By inputting a pulse train signal to the noid 63, the fluid chamber 3
7 to reduce the fluid flow area. This controls the flow rate of fluid discharged from the hydraulic ram 102 and controls the speed of the rider 101.

FIG. 3 shows a method of driving the pilot valve solenoid as described above, in which the command generation circuit 110 generates the running pattern of the elevator. The drive circuit 113 generates a pulse train signal of a specific frequency having a width proportional to the magnitude of this command. This compares the specific frequency signal from the oscillator 112 with the running pattern signal to generate a pulse train signal of a specific frequency. By doing so, the flow rate flowing through the pilot valve and the command from the generation circuit 110 are approximately proportional, and the flow rate supplied to or discharged from the hydraulic ram 102 can be controlled.

Next, the command signal generated by the generation circuit 110 will be explained. Figure 4 shows the signal pattern to the solenoid. First, in the case of ascent, when accelerating, the excitation pulse width of the solenoid 53 is widened so that the pilot valve 50 is almost fully closed, and if the excitation pulse width of the solenoid 43 is widened,
A pilot R body is supplied to the fluid chamber 17 of the lift control valve 10, and this valve gradually closes. Solenoid 4 when decelerating
If the pulse width of 3 is narrowed, the pilot valve 40 is almost fully closed, and the excitation pulse width of the solenoid 53 is narrowed, the pilot fluid is discharged from the fluid chamber 17 and the rise control valve gradually opens. .

When the passenger is seated, the pulse width of the solenoid 53 is widened again to bring it into a state close to fully closed, so that the poppet 11 maintains its current position, and the passenger moves up at a constant speed.

The same goes for descending; when accelerating, the excitation pulse width of the solenoid 63 is widened to bring this valve close to fully closed, and when the excitation pulse width of the solenoid 73 is gradually widened, 'F descent control groans. The pilot fluid in the fluid chamber 37 of the valve is discharged, and the flow area of the control valve 30 becomes wider. Solenoid 7 when decelerating
The excitation pulse width of solenoid 63 is narrowed to keep the pilot valve 70 in a nearly fully closed state, and the excitation pulse width of sol/noid 63 is narrowed. By doing this, the poppet 31 gradually closes and decelerates the rider. In the case of landing on the floor, the pulse width of the solenoid 63 is widened again to bring the pilot valve 60 close to fully closed, so that the poppet 31 maintains its current position and the car descends at a constant speed.

Here, the speed pattern is determined as follows.

All elevator speed patterns are set in advance. When the operating conditions of the elevator (fluid temperature, applied load) change, the flow rate of fluid flowing through the control valve changes even if the opening degree of the control valve remains the same. Therefore, the temperature of the fluid and the applied load (detected by plate or pressure) are determined.

One or both of them are detected and the speed pattern is corrected according to the operating conditions. This is shown in FIG.
is provided, and one or both of the fluid temperature and the applied load are manually controlled, the speed pattern is corrected, and the speed pattern is sent to the drive circuit 113.

By doing so, the hydraulic elevator according to the present invention can always operate with the target speed pattern under any operating conditions.

Another method of correction for changes in fluid temperature and applied load will be explained. The method is as shown in FIG.
Instead of inputting the fluid temperature, the load multiplied by a quantity that expresses the velocity of the velocity (multiplied by the velocity of the velocity).

The speed of the plunger, the flow rate supplied to and discharged from the fluid pressure ram, etc.) is input and compared with the speed pattern input from the command generation circuit 110, and the difference between the target speed pattern and the actual speed pattern is determined. This corrects the signal to the solenoid. The method of correction is as shown in the table below depending on the relationship between the command signal ig and the signal if representing the actual operation.

That is, the fluid pressure in the fluid chamber 17.37 is controlled by changing the operating ratio of the solenoid 43.53 in the case of upward movement and of the solenoid 63.73 in the case of downward movement.

〔Effect of the invention〕

According to the present invention, since the fluid passage area of the pilot valve that controls the operation of the main control valve is made variable, constant running characteristics can always be obtained even if the load conditions and temperature conditions of the elevator change. be able to.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the configuration of the fluid pressure elevator of the present invention, Fig. 2 is a sectional view showing an embodiment of the flow 10% control valve of the present invention, and Fig. 3 is a diagram of the pilot valve of the present invention. FIG. 4 is a diagram showing a circuit for driving a solenoid, FIG. 4 is a diagram for explaining a signal pattern to a pilot valve solenoid in the present invention, and FIG. 5 is a diagram showing a pilot valve solenoid in another embodiment of the present invention. It is a diagram showing a circuit for driving. 1...Flow control valve, 102...Fluid pressure ram, 10.
... Ascending control valve, 20... Check valve, 30... Descending control valve, 40t50t60,70-z<Iotsu) valve,
11゜21.31...boppet), 13.33...notch, 41.51, 61.71...valve body, 43,53
゜63.73...Solenoid・α0・1st eye

Claims (1)

[Claims] 1. In a fluid pressure elevator of a type in which the speed of a passenger connected directly or indirectly to a fluid pressure cylinder is controlled by controlling the flow rate of pressure fluid supplied to or discharged from the fluid pressure cylinder, A fluid pressure elevator comprising a flow control valve in which a pilot valve is arranged so as to simultaneously supply and discharge pilot fluid pressure for controlling a control valve poppet. 2. The fluid pressure elevator according to claim 1, wherein the solenoid of the pilot valve is excited by a pulse train signal having a pulse width proportional to a command signal. 3. The hydraulic elevator according to claim 2, wherein the command signal detects one or both of fluid temperature and applied load, and is corrected based on this detection. 4. Comparing the command signal and the corresponding actual operation signal, and controlling the pilot valve drive command so that if the pilot valve drive command is increased by 10,000, the other is decreased based on the comparison result. The fluid pressure elevator according to item 2.