JPH01172601A - Hydraulic circuit control device - Google Patents

Abstract

PURPOSE:To adjust the feed quantity of working oil to a hydraulic cylinder by interposing a hydraulic motor for detecting the flow rate of the working oil between a hydraulic pump and a hydraulic cylinder. CONSTITUTION:When pressurized oil is sent into the hydraulic cylinders 11 and 14 from a hydraulic pump 21 in a hydraulic circuit, the working oil flows in the hydraulic motors 24 and 25, and the output shafts 24a and 25a are revolved. Therefore, the detection bodies 50 and 50a installed onto the output shafts 24a and 25a of the hydraulic motors 24 and 25 are revolved, and each pulse signal is generated in the approach switches 52 and 52a. The generated pulse signals are counted by a counter, and when the counted pulse signal reaches a previously set counted number, the flow rate adjusting valves 26 and 27 in the hydraulic circuit are operated to control the flow rate of the working oil supplied into the hydraulic cylinders 11 and 14.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a control device for a hydraulic circuit, in which the flow rate of hydraulic oil is measured by a hydraulic motor, and according to the measured flow rate,
The present invention relates to a control device for a hydraulic circuit in which the flow rate of the hydraulic circuit is controlled by an electromagnetic control valve.

"Prior Art" The present applicant previously proposed a rotationally movable formwork apparatus suitable for use in constructing concrete structures such as dams.

This rotary and movable formwork device connects a pair of upper and lower formworks using a link mechanism, and this link mechanism is driven by a hydraulic cylinder equipped with a hydraulic circuit to move the formwork located on the upper side into the existing concrete While fixed to the structure, the lower formwork is rotated and moved further above the upper formwork, and concrete is poured inside thereof,
After the concrete placement work of this lift is completed, the formwork located above is fixed to this concrete placement area, and the formwork located below is moved further upward to the next lift. This is a device that constructs concrete structures by repeatedly carrying out tasks such as concrete pouring.

The hydraulic circuit includes a hydraulic pump that supplies pressure oil to the hydraulic cylinder, and a flow regulating valve that is inserted between the hydraulic pump and the hydraulic cylinder and controlled by a limit switch. , when rotating the lower formwork of the rotary movable formwork device and moving it to the next lift, detecting the rotation angle of the lower formwork with a limit switch immediately before the rotation of the lower formwork ends; As a result, the flow rate of pressure oil in the hydraulic circuit is controlled by the flow ffl adjustment valve, and the operating state of the hydraulic cylinder is slowed down, thereby controlling the rotational speed of the formwork to be reduced.

"Problems to be Solved by the Invention" However, in the conventional hydraulic circuit control device,
The rotation angle of the formwork is detected using a limit switch, but it is difficult to ensure accuracy when installing limit switches, and many limit switches are installed on each formwork. Complex wiring is required to reach the limit switch attached to the formwork, which increases costs.Furthermore, limit switches have a high probability of failure, especially if they are attached to mortar, etc. A problem has arisen.

The present invention has been made in view of the above circumstances, and as a result, eliminates the need for limit switches, and as a result, eliminates the need for complicated wiring to the limit switches, reduces costs, reduces the probability of failure, and An object of the present invention is to provide a control device for a hydraulic circuit that can accurately detect the rotation angle of a hydraulic circuit.

"Means for Solving the Problems" The present invention has been made in view of the above problems, and includes a hydraulic pump that supplies pressure oil to a hydraulic cylinder, and a hydraulic pump that supplies pressure oil to a hydraulic cylinder. A hydraulic motor for detecting the flow rate of hydraulic oil is inserted in the hydraulic motor, a detection body that rotates together with the output shaft is attached to the output shaft of the hydraulic motor, and a proximity switch is installed near the detection body. , a counter is provided for counting pulse signals generated in the proximity switch as the detection body rotates, and a flow rate is provided for adjusting the amount of hydraulic oil supplied to the hydraulic cylinder according to the pulse signals counted by the counter. It is equipped with an ffi adjustment valve.

"Function" When pressure oil is sent from the hydraulic pump in the hydraulic circuit to the hydraulic cylinder, the hydraulic oil flows inside the hydraulic motor and rotates the output shaft.As a result, the sensing object attached to the output shaft of the hydraulic motor This generates a pulse signal in the proximity switch, this generated pulse signal is counted by a counter, and when this counted pulse signal reaches a preset count number, the flow regulating valve of the hydraulic circuit is activated. to control the flow rate of hydraulic oil supplied to the hydraulic cylinder.

"Example" The present invention will be described below with reference to the drawings.

1 to 4 show one embodiment of the present invention, in which the hydraulic circuit of the present invention is applied to the rotationally movable formwork apparatus shown in FIGS. 5 to 8.

First, the outline of the rotationally movable formwork device will be explained using FIG. 5. The symbol l in the figure indicates a rotary formwork device,
The rotary formwork equipment! has an upper formwork 2 on the upper side and a lower formwork 3 on the lower side.

The upper formwork 2 has a rectangular weir plate portion 2a that serves as a formwork for pouring concrete on its front surface, and is connected to the back surface of this weir plate portion 2a by an adjustment fitting 2b, and is connected to the weir plate portion 2a by an adjustment fitting 2b. It consists of a frame 2c supporting the frame 2a.

Also, lower formwork 3. is a weir plate part 3 similar to the upper formwork 2
a, and a frame 3C connected to this by an adjustment fitting 3b. Mounting stands 4° 5 are attached to the back surfaces of the upper formwork 2 and the lower formwork 3 to provide a rotation mechanism for rotatably connecting the upper formwork 2 and the lower formwork 3. There is.

The rotation mechanism will be described below. A mounting bracket 6.7 and a fixing bracket 8.9 are fixed to the back side of the mounting base 4.5. The mounting bracket 6 has long members 6a and 6b connected to each other with pins to form a link mechanism R1, and the mounting bracket 7 has long members 7a and 7b connected to each other with pins. This constitutes a link mechanism R2. The link mechanism 111. A connecting member IO connecting the upper formwork 2 and the lower formwork 3 is rotatably connected with a pin between the elongated members 6b and 7b of rt2.

These link mechanisms 111 . A driving hydraulic cylinder 11 for driving rt2 is installed, and the driving hydraulic cylinder 1
The first cylinder body 11a is rotatably pin-joined to the connecting member 10. Further, the intermediate portions of the elongated members 6 b, 7 b of the link mechanisms R1, R2 are connected to the fixing metal fittings 8.
9 by a locking pin 12.13, which is driven by a locking hydraulic cylinder 14.14. Note that the driving hydraulic cylinder 11. A pair of locking hydraulic cylinders and rotation mechanisms such as link mechanisms R1 and R2 are installed on each of the left and right sides of the upper formwork 2 and the lower formwork 3.

The driving hydraulic cylinder 11 and the locking hydraulic cylinder 14 constitute a hydraulic circuit by including a hydraulic circuit unit 20 as shown in FIG. The hydraulic circuit unit 20 includes the driving hydraulic cylinder 11.
And a hydraulic pump 2 that supplies pressure oil to the locking hydraulic cylinder 14! , an oil tank 22 for storing hydraulic oil, an electromagnetic flow ffi adjustment valve 23 for adjusting the flow rate of pressure oil, hydraulic motors 24 and 25 for measuring the flow rate, and an electromagnetic switch for switching the flow path. The main components include valves 26, 27, etc., and on the suction side of the hydraulic pump 21 there is a pipe 28 whose tip is buried in the hydraulic oil stored in the oil tank 22.
A discharge pipe 29 is provided on the discharge side of the hydraulic pump 21. The tip of the discharge pipe 29 is branched into two pipes 30 and 31, and the pipe 30 is connected to the electromagnetic switching valve 26, and the pipe 31 is connected to the electromagnetic switching valve 2.
7 is connected. Further, the electromagnetic switching valve 26 is connected to the pump side of the driving hydraulic cylinder 11 by a pipe 32,
The electromagnetic switching valve 27 is connected to the locking hydraulic cylinder 14 by a pipe 33. Quick joints 34 and 35 are inserted in the middle of the pipes 32 and 33 to removably connect the formwork side and the hydraulic circuit unit side, and a quick joint 34 and 35 is inserted in the middle of the discharge pipe 29. , check valve 3
6. An electromagnetic flow rate adjustment valve 23 and a hydraulic motor 24 are inserted, and a pipe 39 equipped with a pressure switch 37 and a relief valve 38 is connected between the check valve 36 and the electromagnetic flow ffi adjustment valve 23. has been done.

The tank side of the driving hydraulic cylinder 11 and the electromagnetic switching valve 2
A return piping 40 is connected between the locking hydraulic cylinder! A return pipe 41 is connected between the tank side of No. 4 and the electromagnetic switching valve 27.

Also, in the middle of the piping 40.41, there is a quick joint 42. similar to the quick joint 34.35.
43 are provided. Further, the electromagnetic switching valve 26 is connected to a return pipe 44 to the oil tank 22, and the electromagnetic switching valve 27 is connected to a pipe 45 whose other end is connected to the pipe 44. A hydraulic motor 25 is inserted in the middle of the pipe 44, and the hydraulic motor 25
An on-load valve 46 is inserted between the piping 47 on the downstream side and the discharge piping 29 to form a Viva X circuit.

Output shaft 24 a (25,
), as shown in FIGS. 2(a) and 2(b), there is a detection body 5o that rotates together with the output shaft 24a (25a).
(50a) is attached. This detection object 5o (5
0a) has a convex portion 51 (51a) formed on the outer circumference of a ferromagnetic material formed in a disk shape, and this convex portion 51 (
A proximity switch 52 (52a) such as an electromagnetic pickup sensor is installed near the tip of the detection object 50 (51a).
This is for causing the proximity switch 52 (52a) to generate a pulse signal in accordance with the rotation of the switch 50a). Note that an optical method may be used as the detection method. The proximity switch 52 (52a), as shown in FIG.
It is connected to a counter 53 that counts the pulse signals generated by the proximity switch 52 (52a), and the counter 53 starts counting up when the pulse signals counted by the counter reach a preset count number. It is connected to a sequencer 54 for transmitting signals, and connected to this sequencer 54 are electromagnetic flow m adjustment valves 23 or electromagnetic switching valves 26, 27 that operate according to the signals. Further, a pressure switch 37 is connected to the input side of the sequencer 54.

In this embodiment, two counters 53 are installed for the driving hydraulic cylinder 11 and one for the locking hydraulic cylinder 14, and the pulse signal of the counter 53 is The set value of the count-up number is determined by the fact that in the driving hydraulic cylinder 11, the upper formwork 2 and the lower formwork 3 rotate, and pressure oil is supplied into the cylinder to a position where the upper formwork 2 and the lower formwork 3 are decelerated before completing their rotation. In the lock hydraulic cylinder 14, it is set at the time when pressure oil is supplied to the stroke end position of the lock hydraulic cylinder 14.

Next, a method of controlling the hydraulic circuit of this embodiment configured as described above will be explained along with its operation.

First, as shown in FIG. 5, the concrete C cast inside the upper formwork 2 is solidified, and after the upper formwork 2 is fixed to the concrete using a predetermined method, the hydraulic circuit unit 20
Hydraulic pump 2! is started to supply pressure oil to the discharge pipe 29. Hydraulic pump 2! The pressure oil sent from
7, 44 and returns to the hydraulic tank 22 in a circulation line.

Next, by closing the on-load valve 46 and switching the electromagnetic switching valve 27 to the forward direction, pressure oil is supplied to the pump side of the locking hydraulic cylinder 14 to drive the locking hydraulic cylinder 14. Then remove the lock bin I2 from the link mechanism R1, and attach the fixing bracket 8 and the link mechanism rtt.
Cancel the fixed state with. At that time, when the pressure oil flowing through the discharge pipe 29 flows inside the hydraulic motor 24, the output shaft 24
a is rotated, and the detection body 50 fixed to the output shaft 24a is also rotated, thereby causing the detection switch 52 to generate a pulse signal, and the generated pulse signal is counted by the counter 53. Also, the return oil on the tank side of the locking hydraulic cylinder 14 is transferred to the electromagnetic switching valve 27.
It returns to the oil tank 22 via pipes 45 and 44,
At this time, the flow flows inside the hydraulic motor 25, rotates the output shaft 25a, rotates the detection body 50a, and generates a pulse signal to the proximity switch 5.2a, and this generated pulse signal is sent to the counter 53 and counted. be done. When the pulse signal counted by one of the counters 53 reaches a predetermined count, a count-up signal is input to the sequencer 54, a control signal is transmitted from the sequencer 54 to the electromagnetic switching valve 27, and the electromagnetic switching The valve 27 is switched to the neutral state, and the supply of pressure oil to the locking hydraulic cylinder 14 is stopped. In this case, the set value of the count number of the pulse signal is set to the stroke end position of the locking hydraulic cylinder 14. In addition,
The counter 53 is designed to operate at the same time as the electromagnetic switching valve 27 operates.

When the fixed state between the fixing fitting 8 and the link 4ff141[1 is released, the electromagnetic switching valve 26 is switched in the forward direction to supply pressure oil to the pump side of the driving hydraulic cylinder 11, and the driving hydraulic cylinder 11 drive. As the driving hydraulic cylinder 11 contracts, the link mechanism R1 operates, and the lower formwork 3 gradually starts to make a large rotation upward, as shown in FIG. At that time, the hydraulic motor 24 is activated by the pressure oil flowing inside the hydraulic motor 24 inserted in the discharge pipe 29.
The output shaft 24a of the detector rotates, causing the detection body 50 to rotate, thereby causing the proximity switch 52 to generate a pulse signal.

Similarly, the hydraulic cylinder for driving! The output shaft 25a of the hydraulic motor 25 is rotated by the return oil flowing in the return piping 44 from the tank side of the sensor 1 through the electromagnetic switching valve 26, and the output shaft 25a of the hydraulic motor 25 is rotated.
0a to generate a pulse signal to the proximity switch 52a. The pulse signal 1 generated in each proximity switch 52 (52a) is sent to each counter 53 and counted.

Furthermore, when the driving hydraulic cylinder [1 is contracted, the lower formwork 3
further rotates, passes through the state shown in FIG. 7, moves to the state shown in FIG. 8, and stops.

Then, the lower formwork 3 is moved to a predetermined position (
For example, the number of pulse signals counted by one of the counters 53 connected to the hydraulic motor 24, 25 in the state shown in FIG.
When the preset count number is reached and the count-up reaches one point in time as shown in FIG. J! A control signal is sent to the J regulating valve 23 to operate the electromagnetic flow regulating valve 23 and reduce the flow rate of pressure oil sent to the drive hydraulic cylinder 11. As a result, the contraction speed of the drive hydraulic cylinder 11 is slowed down, the rotational speed of the lower formwork 3 is reduced, and the lower formwork 3 gradually shifts to the stopped state shown in FIG. Become. Then, when the lower formwork 3 comes into contact with a stopper (not shown) and the rotation ends, the pressure inside the discharge pipe 29 increases, which activates the pressure switch 37, reaching the time t1 shown in FIG. Solenoid switching valve 26
is switched, and the supply of pressure oil to the driving hydraulic cylinder 11 is stopped.

Therefore, the lower formwork 3 stops gently, no impact is generated on the rotating formwork device l, and it stops reliably.
The device will not be damaged due to excessive rotation.

Then, when the lower formwork 3 rotates a great deal and stops in the state shown in FIG. 8, the locking hydraulic cylinder 14 on the lower formwork 3 side is driven to fix the fixture 9 and the link mechanism R2. After releasing the , pressurized oil is supplied to another hydraulic cylinder for driving (not shown) to drive the hydraulic cylinder for driving, thereby driving the link mechanism R2 and rotating the lower formwork 3 by 180 degrees at that position. Then, the formwork is in the state shown in Fig. 5. In that case, the same I and p as in the case of the giant slalom described above are used.
Then, the hydraulic motor measures the flow rate of the pressure oil, the pulse signal generated at the proximity switch is counted up by the counter i, and when the count reaches the set value, the electromagnetic flow regulating valve is activated to adjust the driving hydraulic pressure. The amount of pressure oil supplied into the cylinder is controlled, and the drive hydraulic cylinder is gently compressed to slow down the formwork.

Therefore, in this embodiment, a hydraulic motor 24 for detecting the flow rate of pressure oil is inserted between the hydraulic pump 21, the driving hydraulic cylinder 11, and the locking hydraulic cylinder 14, and the output shaft 24a of the hydraulic motor 24 is A detection body 50 is attached to the detection body 50, a proximity switch 52 is installed near the detection body 50, and a pulse signal generated in the proximity switch 52 as the detection body 50 rotates is counted by a counter.
When the pulse signal counted by this counter 53 reaches the set value, an output signal is sent to the sequencer 54, and then a control signal is sent from the sequencer 54 to the electromagnetic flow m adjustment valve 23, and the electromagnetic flow m adjustment valve 23 to reduce the amount of pressure oil supplied to the driving hydraulic cylinder [1].
Since it is designed to reduce the rotational speed of the formwork, unlike conventional limit switches, installation accuracy is not a problem, and the electromagnetic flow rate adjustment valve 23 is operated accurately at a predetermined position, and the hydraulic circuit be able to control, and also
This eliminates the need for complicated wiring such as limit switches, which reduces costs.Furthermore, since the hydraulic circuit unit is installed in a location separate from the formwork equipment, there is no need for mortar, etc. Failures can be prevented, and the hydraulic motor almost never breaks down.

Furthermore, in this embodiment, 1. A hydraulic motor is also inserted in the return piping from the driving hydraulic cylinder and the locking hydraulic cylinder to the oil tank 22, and the detecting body generates a pulse signal to the proximity switch in the same way as above, and the pulse signal is counted up by the counter. Therefore, regardless of the direction of extension or contraction of the driving hydraulic cylinder and the locking hydraulic cylinder, control is possible when one of the counters counts up a predetermined pulse signal, and multiple cylinders can be controlled. It is also possible to detect the position of

Note that embodiments other than those described above and other technical matters will be described below.

(i) In the above embodiments, the hydraulic circuit control device of the present invention is applied to a rotationally movable formwork device, but the invention is not limited to this, and a hydraulic motor may be provided in the hydraulic circuit to control the oil flow. The present invention may be applied to any device as long as it measures the amount of water and controls a hydraulic circuit by switching an electromagnetic switching valve, an electromagnetic flow rate adjustment valve, etc.

(ii) The number and connection method of the hydraulic motor, electromagnetic flow f11 adjustment valve, electromagnetic switching valve, hydraulic cylinder, etc. shown in the hydraulic circuit of the above embodiment is not limited to this.
It goes without saying that the design can be changed as appropriate depending on the situation, and the number of counters, pressure switches, etc. can also be changed as appropriate.

"Effects of the Invention" As explained above, the present invention provides a hydraulic motor for detecting the flow rate of hydraulic oil between a hydraulic pump and a hydraulic cylinder, and an output shaft and an output shaft of the hydraulic motor. A detection body that rotates as one body is attached, a proximity switch is installed near the detection body, and a counter is provided to count the pulse signals generated in the proximity switch as the detection body rotates. The sensor is equipped with a flow fn adjustment valve for adjusting the amount of hydraulic oil supplied to the 411-pressure cylinder in accordance with the pulse signal generated by the sensor, and when the detection body rotates, a pulse signal is generated in the proximity switch, and this generation The pulse signal is counted by a counter, and when the counted pulse signal reaches a preset count number, the flow ffi adjustment valve of the hydraulic circuit is operated to adjust the flow rate of hydraulic oil supplied to the hydraulic cylinder. Since it is designed to be controlled, there is no flow ff1g outside the hydraulic circuit.
Eliminating the need for limit switches to operate the valve regulator and complicated wiring to the limit switches, it is possible to reduce the cost of the control device, significantly reduce the probability of failure, and improve accuracy. This provides an excellent effect in that the hydraulic circuit can be well controlled.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a system diagram of a hydraulic circuit, and FIG. 2 (a) is an output shaft of a hydraulic motor and a detection body attached to it. FIG. 2(b) is a side view of the output shaft of the hydraulic motor in FIG. 2(a), the detection body attached to it, and the detection switch disposed near it. 3 is a block diagram showing the control method of the hydraulic circuit,
Fig. 4 is a time chart showing the operating states of the 71iliff switching valve and the electromagnetic flow control valve in the hydraulic circuit, and Figs. 5 to 8 show a rotationally movable formwork device to which the hydraulic circuit control device of the present invention is applied. Fig. 5 is a side view of the rotary movable formwork device showing concrete being poured inside the formwork, and Fig. 6 is a side view of the rotary movable formwork device showing concrete being poured inside the formwork, and Fig. 6 is a side view of the lower formwork with the upper formwork fixed to the existing concrete. FIG. 7 is a side view of the rotary movable formwork device showing the lower formwork being rotated to a predetermined position; FIG. FIG. 2 is a side view of the rotationally movable formwork device showing a state in which the lower formwork has completed a large rotation of 180° with respect to the upper formwork. 11... Drive hydraulic cylinder, 14...
・Hydraulic cylinder for lock, 21...? ll+pressure pump, 23...Flow rate adjustment valve (electromagnetic flow rate adjustment valve), 24.25...Hydraulic motor, 24a, 25
a... Output shaft, 50, 50a... Detection object, 52, 52a... Detection switch, 53...
····counter.

Claims (1)

[Claims] A hydraulic pump for supplying pressure oil to a hydraulic cylinder is provided, a hydraulic motor for measuring the flow rate of hydraulic oil is inserted between the hydraulic pump and the hydraulic cylinder, and an output shaft of the hydraulic motor is connected to the output shaft. A detection body that rotates as one body is attached, a proximity switch is installed near the detection body, and a counter is provided to count the pulse signals generated in the proximity switch as the detection body rotates. A control device for a hydraulic circuit, comprising a flow rate adjustment valve for adjusting the amount of hydraulic oil supplied to the hydraulic cylinder in accordance with a pulse signal.