KR101340285B1 - Valve control apparatus for concrete pump car and control method thereof - Google Patents

Abstract

The present invention relates to a valve driving device for a concrete pump vehicle and a control method thereof. The valve driving device includes first and second main cylinders which are installed on a side of a hopper and which sucks concrete mortar stirred in the hopper and supplies the stirred concrete mortar to a transfer pipe; first and second valve bodies which are installed to be rotated around each rotary shaft in order to connecting or opening the first and second main cylinders and the transfer pipe; and first and second cylinders which rotates the first and second valve bodies. The valve driving device continuously supplies the concrete mortar, which is supplied to the first and second main cylinders by the expansion, to a working position by using a pair of valves.

Description

VALVE CONTROL APPARATUS FOR CONCRETE PUMP CAR AND CONTROL METHOD THEREOF}

The present invention relates to a valve driving device for a concrete pump car and a control method thereof for controlling the opening and closing of the valve to continuously supply the stirred concrete mortar to the hopper of the concrete pump car.

In general, a concrete pump car is a device that presses the mixed concrete from the basement to the position where the work is carried out in the process of building, forcibly transported through the pipe.

For example, Patent Literature 1 to Patent Literature 3 discloses a technique of forcibly conveying a concrete mortar stirred in a concrete pump car to a work position.

Patent Document 1 discloses a mortar-concrete pumping apparatus for a concrete pump car that minimizes vibration generated at the end of a discharge port by using a pressure-feeding pipe and a boom pipe and presses the fine mortar concrete having fine particles into aggregate.

Patent Literature 2 provides one s-valve connecting two cylinders and one feed pipe to a hopper of a concrete pump car, and selectively discharges two cylinders by using an s-valve to continuously discharge concrete from the two cylinders. The structure to make is disclosed.

Patent document 3 connects two cylinder ends to a valve plate of a hopper, installs a swing valve bent on the valve plate, and rotates the swing valve to communicate with the two cylinders alternately, so that the concrete pump car sucks and pumps concrete. A swing valve drive of a piston pump is disclosed.

Korean Utility Model Registration Publication No. 20-0313440 (announced May 16, 2003) Korean Utility Model Registration Publication No. 20-0440088 (announced May 23, 2008) Republic of Korea Utility Model Publication No. 20-1999-0016727 (released May 25, 1999)

However, the concrete pump car according to the prior art including Patent Documents 1 to 3 selectively blocks two cylinders using one valve to pressurize the concrete mortar so that discontinuity occurs according to the opening and closing timing. .

Therefore, the concrete pump car according to the prior art had a limit in supplying concrete mortar continuously.

Accordingly, the concrete pump car according to the prior art has a problem that the rumbling due to the discontinuous supply in the opening and closing process of each cylinder and valve, the noise and vibration is increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems as described above, and to provide a valve control apparatus for a concrete pump car and a control method thereof capable of continuously feeding the stirred concrete mortar from the hopper to the work place.

Another object of the present invention is to provide a valve control device for a concrete pump car and a method of controlling the same, by controlling the opening and closing timing of the valve by using two valves to minimize snarl, noise, and vibration generated during a concrete mortar supply process.

In order to achieve the object as described above, the valve drive device for a concrete pump car according to the present invention is installed on one side of the hopper and the first and second main cylinder for sucking the concrete mortar stirred in the hopper to supply to the transfer pipe, First and second valve bodies rotatably installed around each axis of rotation so as to connect or open the first and second main cylinders and the transfer pipe, and first and second rotational movements of the first and second valve bodies. Characterized in that it comprises two cylinders.

One side of the hopper is provided with a valve plate having first and second opening and closing holes are formed to be connected to the first and first main cylinders, the first and second valve body in accordance with the stretching operation of the first and second cylinder The first and second opening and closing hole formed in the valve plate is alternately opened and closed.

The first and second valve bodies are each formed to be bent, a rotary shaft installed in the longitudinal direction on the rear side of the body, the stretching operation of the piston installed in the rear end of the rotary shaft and installed in the first and second cylinders Rotational movement by it characterized in that it comprises a rotating member for rotating the rotary shaft and the body.

According to an embodiment of the present invention, a sensing unit detects an operating state of the first and second main cylinders, and a control signal to control the operation of the first and second main cylinders and the first and second cylinders based on a sensing signal of the sensing unit. And a driving unit for supplying driving pressure to the first and second main cylinders and the first and second cylinders according to the control unit generating the control signal and the control signal of the control unit.

The sensing unit includes first to fourth sensing sensors for sensing the stretching operation state of the first main cylinder and fifth to eighth sensing sensors for sensing the stretching operation state of the second main cylinder. The fifth detection sensor is installed in the retracted position of the first and second main cylinder, respectively, the second and sixth detection sensors are respectively installed in the extended position of the first main cylinder, the control unit is the first detection When the sensor detects the expansion operation of the first main cylinder, a control signal is generated to contract the second main cylinder, and when the detection signal of the second detection sensor is transmitted, the contraction operation of the second main cylinder is performed. Generating a control signal to stop.

The distance between the third and fourth detection sensors and the distance between the seventh and eighth detection sensors are set to be shorter than the distance between the first and second detection sensors and the distance of the fifth and sixth detection sensors, respectively. It is done.

And a setting knob for setting a delay time for performing an additional decompression operation during the decompression operation of the first and second main cylinders.

In addition, in order to achieve the above object, the control method of the valve drive device for a concrete pump car according to the present invention (a) to drive the first and second main cylinders installed on one side of the hopper to expand and contract in the opposite direction to each other Step, (b) alternately opening and closing the first and second opening and closing hole of the valve plate installed on one side of the hopper by rotating the first and second valve body in conjunction with the expansion and contraction operation of the first and second main cylinder And (c) supplying the concrete mortar continuously supplied to the transfer pipe through the first valve body and the second valve body to a working position.

In the step (b), (b1) driving the second main cylinder based on the detection signals of the first to fourth sensing sensors detecting the operation state of the first main cylinder, (b2) the second main cylinder Driving the first main cylinder based on detection signals of the fifth to eighth detection sensors for detecting an operation state of the cylinder; (b3) the first main cylinder based on the detection signals of the third and fourth detection sensors. Telescopic operation of the first cylinder for rotating the valve body and (b4) telescopic operation of the second cylinder for rotating the second valve body based on the detection signals of the seventh and eighth sensors. It is characterized by including.

According to the present invention, (d) setting a delay time for performing an additional decompression operation in the decompression operation of the first and second main cylinders, and (e) a preset initial operation when the driving of the first and second main cylinders is stopped. And returning to a state.

As described above, according to the valve drive device for a concrete pump car and a control method thereof according to the present invention, the working position of the concrete mortar continuously supplied to the first and second main cylinders by stretching operation using a pair of valves continuously The effect that it can supply until is obtained.

That is, according to the valve driving apparatus for concrete pump cars and the control method thereof according to the present invention, the first and second opening and closing holes formed in the valve plate are alternately opened and closed by using the first and second valve bodies. 2 The effect that the main cylinder and the branch pipe can be connected continuously is obtained.

And according to the valve drive device for a concrete pump car and a control method thereof according to the present invention, by operating the setting knob to change the delay time to perform an additional stretching operation during the stretching operation of the first and second main cylinder, The effect of compensating for the difference in contraction speed and adjusting the opening and closing timing of the first and second valve bodies can be obtained.

Accordingly, according to the valve driving device for a concrete pump car and the control method thereof according to the present invention, by controlling the opening and closing timing of the valve by using two valves to minimize the grunt, noise and vibration generated in the concrete mortar supply process concrete The effect that the transfer efficiency of mortar can be improved is obtained.

1 is a perspective view of a valve driving device for a concrete pump car according to a preferred embodiment of the present invention,
Figure 2 is a perspective view of a valve driving device for a concrete pump car shown in Figure 1 from another angle,
3 is a plan view of FIG.
4 and 5 are operation state diagrams showing the opening and closing operation of the first and second valve body,
Fig. 6 is a plan view of Fig. 5,
7 is a block diagram of a valve driving device for a concrete pump car shown in FIG.
8 is a flowchart illustrating a step-by-step control method of the valve drive device for a concrete pump car according to an embodiment of the present invention.

Hereinafter, a valve driving apparatus for a concrete pump car and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a valve driving device for a concrete pump car according to a preferred embodiment of the present invention, Figure 2 is a perspective view showing a valve driving device for a concrete pump car shown in Figure 1 from another angle, Figure 3 is a plan view of Figure 1 to be.

In this specification, 'upward', 'downward', 'forward' and 'rear' and other directional terms indicate each direction based on the states shown in the drawings.

Valve driving apparatus for a concrete pump car according to a preferred embodiment of the present invention is installed on one side of the hopper 10, as shown in Figure 1 to 3, the suction of the concrete mortar stirred in the hopper 10 transfer pipe ( 11) rotational movement about each axis of rotation to connect or open the first and second main cylinders 20 and 21, the first and second main cylinders 20 and 21, and the feed pipe 11 to be supplied. And first and second cylinders 30 and 31 to be installed, and first and second cylinders 40 and 41 for rotating the first and second valve bodies 30 and 31.

Hopper 10 is formed in a substantially hexahedral shape with the upper surface opened, and serves to agitate the concrete mortar injected into the interior space by the rotational movement of the stirring body 12 installed across the interior space.

On the rear side of the hopper 10, first and second suctioning of the concrete mortar stirred in the hopper 10 and supplying it to the feed pipe 11 through the first valve body 30 or the second valve body 31. Main cylinders 20 and 21 are installed.

The front of the hopper 10 is provided with a conveying pipe 11 for supplying the stirred concrete mortar to the working position.

Along with this, a valve plate 13 on which the first and second opening and closing holes 14 and 15 are opened and closed by the first and second valve bodies 30 and 31 is installed on the rear surface of the hopper 10. The front side of the hopper 10 is provided with a pair of branch pipes 16 which connect the 1st valve body 30, the 2nd valve body 31, and the feed pipe 11. As shown in FIG.

The stirring body 12 may include a rotating shaft installed across the inner space of the hopper 10 and one or more stirring members for stirring the concrete mortar material while rotating in a vertical direction.

The first and second main cylinders 20 and 21 are installed at the rear side of the hopper 10, and inside the first and second main cylinders 20 and 21, respectively, the concrete mortar that is stirred inside the hopper 10 is sucked in. When the first and second valve bodies 30 and 31 are connected, a piston for supplying the suctioned concrete mortar to the transfer pipe 11 through the first and second valve bodies 30 and 31 is installed.

The first and second valve bodies 30 and 31 alternate between the first and second opening and closing holes 14 and 15 formed in the valve plate 13 according to the operation of the first and second cylinders 40 and 41. Open and close by

The front ends of the first and second valve bodies 30 and 31 are connected to the branch pipe 16 through the front surface of the hopper 10, and the rear ends of the first and second valve bodies 40 and 41 are the first. And a rotational movement to open and close the second opening and closing holes 14 and 15.

That is, each of the first and second valve bodies 30 and 31 has a body 32 formed to be bent in an approximately 'S' shape, and a rotation shaft 33 installed along the longitudinal direction at the rear side of the body 32. ), A rotary member 34 installed at the rear end of the rotary shaft 33 and rotating by the expansion and contraction of the pistons installed in the first and second cylinders 40 and 41 to rotate the rotary shaft 33 and the body 32. ) May be included.

For example, FIGS. 4 and 5 are operational state diagrams showing the opening and closing operations of the first and second valve bodies, and FIG. 6 is a plan view of FIG. 5.

As shown in FIGS. 3 and 4, the first valve body 30 sucks the concrete mortar stirred in the hopper 10 into the first main cylinder 20 as shown in FIGS. 3 and 4. Open the first opening and closing hole 14 so as to.

On the other hand, the second valve body 31 operates opposite to the first valve body 30.

That is, when the first valve body 30 opens the first opening / closing hole 14, the second valve body 31 closes the second opening / closing hole 15 during the extension operation of the second main cylinder 21. 2 Connect the main cylinder (21) and branch pipe (16).

On the other hand, the first valve body 30 is the first opening and closing to connect the first main cylinder 20 and the branch pipe 16, as shown in Figure 5 and 6 during the expansion operation of the first main cylinder 20 Close the ball (14).

On the other hand, in the second valve body 31, when the first valve body 30 closes the first opening / closing hole 14, the concrete mortar stirred inside the hopper 10 by the contracting operation of the second main cylinder 21 is performed. The second opening and closing hole 15 is opened to suck the suction into the second cylinder 21.

Therefore, the present invention can continuously connect the first and second main cylinders and the branch pipe by alternately opening and closing the first and second opening and closing holes formed in the valve plate using the first and second valve bodies.

Accordingly, the present invention, unlike the conventional discontinuous connection between the pair of cylinders and the valve using a single valve, by using a pair of valves alternately connect the pair of cylinders and the transfer pipe concrete Mortar can be fed continuously.

7 is a block diagram of a valve driving device for the concrete pump car shown in FIG.

Valve driving apparatus for a concrete pump car according to a preferred embodiment of the present invention, as shown in Figure 7, the sensing unit 50, the sensing unit for detecting the operating state of the first and second main cylinders (20, 21) ( On the control unit 60 and the control signal for generating a control signal to control the operation of the first and second main cylinders 20 and 21 and the first and second cylinders 40 and 41 based on the detection signal of 50). Accordingly, the driving unit 70 may further include a driving unit 70 supplying driving pressure to the first and second main cylinders 20 and 21 and the first and second cylinders 40 and 41.

The driving unit 70 supplies compressed air or hydraulic oil to the first and second main cylinders 20 and 21 and the first and second cylinders 40 and 41 so as to be stretchable.

In addition, the controller 60 stretches and operates the second main cylinder 21 based on the operation state of the first main cylinder 20 detected by the detector 50, and the first and second main cylinders 20 and 21. The control signal is generated to expand and contract the first and second cylinders 40 and 41 on the basis of the operating state.

For example, as illustrated in FIG. 7, the detection unit 50 may include first to fourth detection sensors 51 to 54 and second main cylinders configured to detect a stretch operation state of the first main cylinder 20. And a fifth to eighth sensors 55 to 58 for detecting a stretching operation state of the 21. FIG.

The first detection sensor 51 may be installed at the contracted position of the first main cylinder 20, and the second detection sensor 52 may be installed at the extended position of the first main cylinder 20.

Accordingly, the controller 60 generates a control signal to start the contracting operation of the second main cylinder 21 when the first main sensor 20 detects the start of the stretching operation of the first main cylinder 20. When the detection signal of the second detection sensor 52 is transmitted, a control signal may be generated to stop the expansion operation of the first main cylinder 20.

The third sensor 53 is installed at the same position as the first sensor 51 or at a position moved by a predetermined distance from the first sensor 51 to the second sensor 52, and the control unit 60. ) May generate a control signal to extend the first cylinder 40 according to the detection signal of the third detection sensor 53.

The fourth detection sensor 53 is installed at a position moved from the second detection sensor 52 to the first detection sensor 51 by a predetermined distance, and the control unit 60 detects the detection signal of the fourth detection sensor 54. As a result, a control signal may be generated to contract the first cylinder 40.

That is, since the stretch movement distance of the first cylinder 40 is shorter than the stretch movement distance of the first main cylinder 20, the distance between the third detection sensor 53 and the fourth detection sensor 54 is the first detection sensor. Shorter than the distance between the 51 and the second sensor 52 is set.

In addition, the fifth detection sensor 55 may be installed at the contracted position of the second main cylinder 21, and the sixth detection sensor 56 may be installed at the extended position of the second main cylinder 21.

Accordingly, the control unit 60 controls the control signal to start the contraction operation of the first main cylinder 20 when the extension operation of the second main cylinder 21 is detected by the detection signal of the fifth detection sensor 55. When the detection signal of the sixth detection sensor 56 is transmitted, the control signal may be generated to stop the contraction operation of the second main cylinder 21.

In addition, the seventh detection sensor 57 is installed at the same position as the fifth detection sensor 55 or at a position moved by a predetermined distance from the fifth detection sensor 55 to the sixth detection sensor 56, and the control unit 60. ) May generate a control signal to extend the second cylinder 31 according to the detection signal of the seventh sensor 57.

The eighth detection sensor 58 is installed at a position moved from the sixth detection sensor 56 to the fifth detection sensor 55 by a predetermined distance, and the controller 60 detects the detection signal of the eighth detection sensor 58. As a result, a control signal may be generated to contract the second cylinder 31.

On the other hand, the first and second main cylinders 20 and 21, which alternately stretch and contract with each other, generate pressure required for the stretching operation inside each cylinder during suction and supply of concrete mortar. The stretching movement speed is slower than the contraction movement speed.

Accordingly, the controller 60 completes the extension operation of the first or second main cylinders 20 and 21 and discharges the concrete mortar remaining in the first and second main cylinders 20 and 21 completely. Delay time can be set between the completion of the contraction operation of the second or the first main cylinder (21, 20).

To this end, the valve driving device for a concrete pump car according to a preferred embodiment of the present invention may further include a setting knob (not shown) for setting the delay time.

The setting knob is installed in a control panel (not shown), and the setting time may be set in a plurality of stages.

That is, when the setting knob is set to the first stage, the controller 60 may generate a control signal to simultaneously operate by setting the delay time of the expansion and contraction operations of the first and second main cylinders 20 and 21 to '0'. .

When the setting knob is set to the second stage, the control unit 60 sets the delay time to about 0.2 to 0.3 seconds, so that after the contraction operation of the first or second main cylinders 20 and 21 is completed, the preset delay time is 0.2. The control signal may be generated to further perform the stretching operation of the second or first main cylinders 21 and 20 by about 0.3 seconds.

When the setting knob is set to three stages, the control unit 60 sets the delay time to about 0.5 seconds to set the delay time after the contraction operation of the first or second main cylinders 20 and 21 is completed. The control signal may be generated to further perform the expansion operation of the second or first main cylinders 21 and 20.

Next, the coupling relationship of the valve drive device for a concrete pump car according to a preferred embodiment of the present invention will be described in detail.

The operator sequentially installs the branch pipe 16 and the transfer pipe 11 on the front surface of the hopper 10 and installs the first and second main cylinders 20 and 21 on the rear surface of the hopper 10.

The operator first and second valve body 30, 31 inside the hopper 10 in a state in which the rotary shaft 33 of the first and second valve body 30, 31 penetrates the rear surface of the hopper 10, respectively. After the body 32 is installed, the rotary members 34 and the first and second cylinders 40 and 41 are connected to the respective rotary shafts 33.

Accordingly, the first and second valve bodies 30 and 31 are rotated by the expansion and contraction of the first and second cylinders 40 and 41, and the first and second opening and closing holes formed in the valve plate 13 ( 14, 15 are alternately opened or connected to the first and second opening and closing holes 14, 15.

In this case, the first and second valve bodies 30 and 31, the first and second cylinders 40 and 41, and the first and second main cylinders 20 and 21 may be assembled in a predetermined initial operating state. .

For example, when the first main cylinder 20 is in the contracting operation state, the first cylinder 30 is in the contracting operation state so that the first valve body 30 opens the first opening / closing hole 14.

On the other hand, the second main cylinder 21 is in the stretching operation state, and the second cylinder 31 is in the stretching operation state so that the second valve body 31 connects the second opening and closing hole 15.

Meanwhile, when the reverse operation is performed to remove the concrete mortar remaining in the first and second main cylinders 20 and 21, the first and second main cylinders 20 and 21 and the first and second cylinders are performed. 40 and 41 can be assembled as opposed to in forward operation.

That is, in the reverse operation, when the first main cylinder 20 is in the contracting operation state, the first cylinder 40 is in the expanding operation state so that the first valve body 30 connects the first opening / closing hole 14.

On the other hand, the second main cylinder 21 is in the stretching operation state, and the second cylinder 31 is in the contracting operation state so that the second valve body 31 opens the second opening / closing hole 15.

Next, with reference to Figure 8 will be described in detail the control method of the valve drive device for a concrete pump car according to an embodiment of the present invention.

8 is a flowchart illustrating a step-by-step method of controlling a valve driving device for a concrete pump car according to a preferred embodiment of the present invention.

As shown in Figure 7, the control method of the valve drive device for a concrete pump car according to a preferred embodiment of the present invention is a power switch (not shown) provided in the control panel (not shown) is turned on the drive unit 70 and The control unit 60 starts while receiving power (S10).

Then, the control unit 60 generates a control signal to drive the first and second main cylinders 20 and 21, and the driving unit 70 supplies compressed air or hydraulic oil in accordance with the control signal to supply the first and second main cylinders. 20 and 21 are driven (S12).

For example, the first main cylinder 20 may start the stretching operation in the contracting operation state, and the second main cylinder 21 may start the contracting operation in the stretching operation state.

In this case, the first to eighth sensors 51 to 58 provided in the sensing unit 50 detect the operating states of the first and second main cylinders 20 and 21, respectively, and output a detection signal (S14). .

The controller 60 controls the first and second cylinders 30 and 31 to rotate the first and second valve bodies 30 and 31 based on the detection signals of the first to eighth sensors 51 to 58. To generate a control signal for controlling the driving.

Then, the driving unit 70 drives the first and second cylinders 40 and 41 according to the control signal, and the first and second valve bodies 30 and 31 are connected to the first and second cylinders 40 and 41. The first and second opening and closing holes 14 and 15 formed in the valve plate 13 are alternately opened or connected while rotating by the expansion and contraction operation (S16).

At this time, the operator operates the setting knob (not shown) provided in the control panel to change the delay time to perform the additional stretching operation during the stretching operation of the first and second main cylinder 20, the stretching operation speed and the contraction operation speed The difference can be compensated and the opening and closing timing of the first and second valve bodies 30 and 31 can be adjusted.

Accordingly, the concrete mortar stirred in the hopper 10 is continuously supplied to the working position through the first and second valve bodies 30 and 31, the branch pipe 16, and the transfer pipe 11 (S18). .

In step S20, the control unit 60 checks whether the power supply is cut off, and controls to repeat steps S12 to S20 until the power supply is cut off.

If the power supply is interrupted as a result of the check in step S20, the control unit 60 controls to return the first and second main cylinders 20 and 21 and the first and second cylinders 40 and 41 to the initial operation state. Then exit.

Through the process as described above, the present invention can continuously supply the concrete mortar supplied to the first and second main cylinder by the stretching operation to the working position by using a pair of valves.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention is applied to a technique of continuously supplying the concrete mortar supplied to the first and second main cylinders by the stretching operation to the working position using a pair of valves.

10: Hopper 11: Transfer pipe
12: stirring body 13: valve plate
14,15: 1st, 2nd opening and closing hole 16: branch pipe
20, 21: 1st, 2nd main cylinder 30, 31: 1st, 2nd valve body
32: body 33: rotation axis
34: rotating member 40, 41: 1st, 2nd cylinder
50: detection unit 51 to 58: first to eighth detection sensor
60: control unit 70:

Claims (10)

First and second main cylinders 20 and 21 installed on one side of the hopper 10 and sucking the concrete mortar stirred by the hopper 10 and supplying the same to the transfer pipe 11;
First and second valve bodies 30 and 31 installed to be rotatable about each rotating shaft to connect or open the first and second main cylinders 20 and 21 and the transfer pipe 11;
First and second cylinders 40 and 41 for rotating the first and second valve bodies 30 and 31;
And a setting knob for setting a delay time for performing an additional stretching operation during the stretching operation of the first and second main cylinders (20, 21). The method of claim 1,
One side of the hopper 10 is provided with a valve plate 13 having first and second opening and closing holes 14 and 15 connected to the first and first main cylinders 20 and 21.
The first and second valve bodies 30 and 31 may have first and second opening and closing holes 14 and 15 formed in the valve plate 13 according to the expansion and contraction operations of the first and second cylinders 40 and 41. Valve drive device for a concrete pump car, characterized in that the opening and closing alternately). 3. The valve according to claim 2, wherein the first and second valve bodies (30, 31) are respectively
A curved body 32,
Rotating shaft 33 is installed along the longitudinal direction at the rear side of the body 32,
Rotating member which is installed at the rear end of the rotary shaft 33 and is rotated by the expansion and contraction of the piston installed in the first and second cylinders (40, 41) to rotate the rotary shaft 33 and the body 32 ( Valve drive device for a concrete pump car, characterized in that it comprises a 34). 4. The method according to any one of claims 1 to 3,
Detecting unit 50 for detecting the operating state of the first and second main cylinder (20, 21),
The controller 60 generates a control signal to control the operation of the first and second main cylinders 20 and 21 and the first and second cylinders 40 and 41 based on the detection signal of the detection unit 50. ) And
Further comprising a driving unit 70 for supplying a driving pressure to the first and second main cylinders (20, 21) and the first and second cylinders (30, 31) in accordance with a control signal of the control unit (60). Valve drive device for a concrete pump car characterized in that. 5. The method of claim 4,
The detector 50 may include first to fourth detection sensors 51 to 54 to detect a stretch operation state of the first main cylinder 20.
It includes a fifth to eighth sensor (55 to 58) for detecting the stretching operation state of the second main cylinder 21,
The first and fifth detection sensors 51 and 55 are installed at the contracted positions of the first and second main cylinders 20 and 21, respectively.
The second and sixth detection sensors 52 and 56 are installed at the extended positions of the first main cylinders 20 and 21, respectively.
The control unit 60 generates a control signal to contract the second main cylinder 21 when the stretching operation of the first main cylinder 20 is detected by the first detection sensor 51, and When the detection signal of the second detection sensor 52 is transmitted, the valve drive device for a concrete pump car, characterized in that for generating a control signal to stop the contraction operation of the second main cylinder (21). The method of claim 5,
The distance between the third and fourth detection sensors 53 and 54 and the distance between the seventh and eighth detection sensors 57 and 58 are respectively equal to the distance between the first and second detection sensors 51 and 52. Valve driving device for a concrete pump car, characterized in that the shorter than the distance of the fifth and sixth sensor (55,56). delete (a) driving the first and second main cylinders installed on one side of the hopper to expand and contract in opposite directions;
(b) alternately opening and closing the first and second opening and closing holes of the valve plate installed at one side of the hopper by rotating the first and second valve bodies in association with the expansion and contraction operations of the first and second main cylinders. ,
(c) supplying concrete mortar continuously supplied to the transfer pipe through the first valve body and the second valve body to a working position;
(d) setting a delay time for performing an additional decompression operation in the decompression operation of the first and second main cylinders;
(e) a method of controlling a valve driving device for a concrete pump car, comprising the step of returning to a predetermined initial operating state when the driving of the first and second main cylinders is stopped. 9. The method of claim 8, wherein step (b)
(b1) driving the second main cylinder based on detection signals of the first to fourth detection sensors detecting the operation state of the first main cylinder;
(b2) driving the first main cylinder based on detection signals of the fifth to eighth detection sensors for detecting an operation state of the second main cylinder;
(b3) stretching and operating the first cylinder for rotating the first valve body based on the detection signals of the third and fourth sensing sensors;
and (b4) expanding and contracting the second cylinder for rotating the second valve body based on the detection signals of the seventh and eighth sensors. . delete

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