JP2004042073A - Method and apparatus for conveying a group of molding flasks with hydraulic cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveying method of a group of molding flasks with hydraulic cylinders and its apparatus by which the molding flask group arranging a plurality of the molding flasks is conveyed without shock and at high speed by using the hydraulic cylinders having large output. <P>SOLUTION: This apparatus is taken as a two-pressure control system in which a proportional controlling valve 32 is used for controlling the side of a hydraulic pusher cylinder 1 and decelerating solenoid valves 33, 34 are used for controlling the side of a hydraulic cushion cylinder 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for transporting a group of molds that intermittently convey a group of molds at a pitch of one mold by holding and holding a group of molds arranged in series by a hydraulic pusher cylinder and a hydraulic cushion cylinder, and a device therefor. .
[0002]
[Prior art]
Conventionally, as a group in which form groups arranged in series are sandwiched and held by a pusher cylinder and a cushion cylinder and intermittently conveyed at a pitch of one form, pneumatic, hydraulic, and electric cylinders are used as a pusher cylinder and a cushion cylinder. (For example, see Japanese Utility Model Publication No. Sho 62-46665).
In the case of using the pneumatic cylinder, it is difficult to finely control the operation speed, the operation distance, the weight correspondence, and the like, and the use degree is small. Further, the electric cylinder can finely control the operation speed, the operation distance, the return distance and the like, but there is a problem that the electric cylinder cannot sufficiently cope with a heavy one. Although hydraulic cylinders are often used to cope with heavy ones, there is a problem that it is difficult to perform fine control and control as with electric cylinders.
[0003]
On the other hand, in recent years, castings have been made thinner and lighter, and the impact during transportation of the mold after green sand molding has dropped on the mold, causing adverse effects such as falling down of the core. The nature is emerging.
However, as market needs, there is a demand for further increase in the size of the mold and speeding up of production equipment in order to reduce the cost of the casting product, and therefore the impact during the transfer of the mold tends to increase.
[0004]
As a cause of the impact at the time of transporting the mold, first, there is a gap between the plurality of molds, and the impact occurs when the molds collide when approaching the gap by the gap. This gap increases due to the progress of abrasion of the mold, in addition to the distance between the cores between the devices and the installation tolerance and the gap necessary for handling such as loading and unloading of the mold, from the beginning of planning. Further, due to the daily operation, the mold undergoes thermal expansion due to the heat of the casting, so that the gap between the molds changes before and after the operation. When low-speed feed control is performed with a hydraulic cylinder in response to such a change in the gap, the feed speed changes due to a change in the hydraulic oil temperature. It becomes.
[0005]
Next, to speed up the equipment, it is necessary to stop the formwork having a large inertial force after deceleration. Therefore, it is necessary to switch the feed speed of the hydraulic pusher cylinder from a high speed to a low speed, and when the speed difference between the high speed and the low speed is large, there is a problem that a high speed change at the time of valve switching becomes an impact.
Further, the formwork runs ahead due to the inertial force with respect to the speed change of the hydraulic pusher cylinder, and a gap is formed between the head of the hydraulic pusher cylinder and the formwork, and an impact may be generated when the gap is approached again.
[0006]
As a mechanism for continuously controlling the speed of the hydraulic cylinder, there is a conventional deceleration valve, which is equipped with a cam on the moving side and presses the flow rate of the deceleration valve and the change section with this cam during movement. Although the valve mechanically controls the amount of oil, there is a problem in that the contact portion between the cam and the deceleration valve is worn.
[0007]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a form group in which a plurality of form forms are arrayed using a hydraulic cylinder having a large output. It is an object to provide a method and an apparatus thereof.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method for transporting a group of formwork by a hydraulic cylinder according to the present invention is a method of sandwiching a group of formwork arranged in series between a hydraulic pusher cylinder and a hydraulic cushion cylinder, with a pitch of one formwork. This is a method of transporting a group of formwork that is intermittently transported by a hydraulic cylinder. In a state where there is a gap between the hydraulic pusher cylinder, the formwork, and the hydraulic cushion cylinder, the hydraulic pusher cylinder is operated at low speed to extrude a series of formwork groups Pressing the frame pushing head of the hydraulic cushion cylinder with the mold in front of the hydraulic cushion cylinder to move the frame, and moving the high speed to the hydraulic pusher cylinder with the formwork group sandwiched between the hydraulic pusher cylinder and the hydraulic cushion cylinder. Pressing and switching the hydraulic cushion cylinder to high back pressure in the deceleration range A step of transporting the mold group by one mold pitch while maintaining the sandwiched state of the mold group; and a step in which the hydraulic cushion cylinder is contracted again after the hydraulic pusher cylinder and the hydraulic cushion cylinder are stopped. Providing gaps before and after the mold in front of the hydraulic cushion cylinder.
[0009]
Further, in order to achieve the above object, a transfer device of the present invention by a hydraulic cylinder of a form group is arranged opposite to a line start end and a line end, and a hydraulic pusher cylinder having a frame pushing head attached to a rod end thereof. And a hydraulic cylinder of a mold group composed of a hydraulic cushion cylinder and a hydraulic piping in which a hydraulic pusher cylinder is provided with a proportional control valve controlled by a controller so that high speed, medium speed and low speed can be controlled. A configuration in which the hydraulic cushion cylinder is controllable via the first electromagnetic valve and a second electromagnetic valve for switching back pressure in the contraction direction of the rod is provided to reduce the form group during high-speed conveyance by switching the back pressure. Characterized in that it is a hydraulic pipe.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a conveying line and a hydraulic piping system diagram in which form groups 3 and 3 are sandwiched between a pusher cylinder 1 and a cushion cylinder 2 which are arranged to face each other, and the pitch is intermittently fed by one form.
Various devices (not shown) are provided between the pusher cylinder 1 and the cushion cylinder 2, and gaps 4, 4 are provided before and after each device and before the pusher cylinder 1 and the cushion cylinder 2.
[0011]
Hydraulic cylinders 11, 11 are used as the pusher cylinder 1 and the cushion cylinder 2, and frame pushing heads 13, 13 are attached to the ends of the piston rods 12, 12 as shown in FIGS. , 14 are held between the guide rollers 15, 15 to maintain the posture of the hydraulic cylinders 11, 11. Hereinafter, the hydraulic cylinders 11 on the pusher cylinder 1 side are collectively referred to as a hydraulic pusher cylinder 1, and the hydraulic cylinders 11 on the cushion cylinder 2 side are collectively referred to as a hydraulic cushion cylinder 2.
The hydraulic pusher cylinder 1 has fixed detectors 17 at the burrs end 17, the speed reducer 18, and the end 19, and the hydraulic cushion cylinder 2 has fixed detectors at the cut end 20 and the mold end 21 fixed to the frames 16, 16. Are located. Attaches 22, 22 and a long abutment 23 for turning each detector ON and OFF are attached to the guide rails 14, 14, respectively.
[0012]
Further, the hydraulic piping will be described with reference to FIG. First, the hydraulic pusher cylinder 1 is connected to a pipe whose speed is controlled by a proportional control valve 32 controlled by a controller 31. The hydraulic cushion cylinder 2 is controlled by a first solenoid valve 33, and a second solenoid valve 34 is provided in the direction in which the rod 12 contracts. By performing two-pressure control to switch back pressure, high-speed conveyance with a large inertia force is performed. Form group 3, 3 is decelerated.
[0013]
The controller 31 of the proportional control valve 32 sets the direction channel 1 (CH1) at a high speed, the channel 2 (CH2) at a medium speed, and the flash direction channel 4 (CH4) at a high speed.
Logic valves 35, 35 are provided in the head-side hydraulic pipes of the two hydraulic cylinders 1, 2, and when the pumps of the hydraulic units 36, 36 are activated, oil leaks from the proportional control valve 32 and the first solenoid valve 33 so that the two hydraulic cylinders 1 The logic valves 35, 35 prevent the rods 12, 12 from jumping out.
That is, when the proportional control valve 32 and the first solenoid valve 33 are at the neutral position at the burrs end of the pusher cylinder 1 and the cut ends of the cushion cylinder 2 (see FIG. 1), the high-pressure hydraulic oil from the hydraulic unit 36 Although closed at the respective P ports of the proportional control valve 32 and the first solenoid valve 33, a phenomenon occurs in which a small amount of hydraulic oil leaks to the respective A and B port sides. When the logic valve 35 is not provided, when the rod side and the head side of the cylinder 11 are simultaneously pressed with hydraulic oil of the same pressure, the rod 12 of the cylinder 11 gradually comes out because the force on the head side having a large sectional area is large. It becomes. In order to prevent this state, a logic valve 35 is attached in the middle of the piping on the head side of the cylinder 11.
The logic valve 35 has a structure that is closed by a valve that presses the middle of the pipe with a spring. Leakage of hydraulic oil from the A port of the solenoid valve to the cylinder 11 head side is prevented by closing the piping by pressing the valve with the force of a spring. When the cylinder 11 is driven by opening and closing the solenoid valve, when the cylinder rod 12 is extended, the piston is pushed by the operating pressure from the solenoid valve A port and the valve is opened. When pulling the cylinder rod 12, the valve is directly pushed open by the hydraulic oil from the cylinder head side.
[0014]
Next, conveyance of the form groups 3 and 3 will be described. FIG. 2 shows the original positions of the feed of the form groups 3 by the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2. In the hydraulic pusher cylinder 1, the rod 12 is at the contracted end, and the burred end 17 is turned on by the ate 22. In the hydraulic cushion cylinder 2, the rod 12 is at the extending end, and the molding end 21 is turned on by the ate 22. The gap 4 is located before and after the carry-in form frame (left end) 3 and before the frame pushing head 13 of the hydraulic cushion cylinder 2.
[0015]
The hydraulic pusher cylinder 1 feeds the form groups 3, 3 in the extending direction of the rod 12 at a medium speed only in the proportional control valve 32 and the channel 2 (CH2) from the start until the frame end 21 of the frame approaching completion is turned off. After the cutting end 21 is turned off, the proportional control valve 32 and the form group 3, 3 are sent out at high speed in the channel 1 (CH1). In this case, without switching from channel 2 (CH2) to channel 1 (CH1), channel 1 (CH1) is superimposed and energized during medium-speed feeding of channel 2 (CH2), and high-speed feeding is performed. Prevents feeding impact.
[0016]
Next, as shown in FIG. 4, when the hydraulic pusher cylinder 1 turns on the high speed frame feed quill deceleration 18 with the long arm 23, the hydraulic cushion cylinder 2 switches to the high back pressure by turning off the second solenoid valve 34. Deceleration is started.
If the ON signal of the live deceleration 18 is missed, the form groups 3 and 3 are not decelerated and a collision with the hydraulic cushion cylinder 2 occurs at a high speed. It has a structure to input.
[0017]
Next, FIG. 5 shows a state in which the push of the hydraulic pusher cylinder 1 is completed. The rod 12 of the hydraulic pusher cylinder 1 is located at the extended end, and the long end 23 has the end 19 turned ON. At this time, the hydraulic cushion cylinder 2 is in the process of contracting, and the cut end 20 has not been turned on by the arm 22 yet.
[0018]
After the hydraulic deceleration 18 is turned on, the hydraulic cushion cylinder 2 has a high back pressure, so that the hydraulic pusher cylinder 1 is decelerated while the channel 1 (CH1) high-speed feed is energized. When the end 19 is turned on, the channel 1 (CH1) high speed is turned off. After a lapse of a predetermined timer time after the end 19 is turned on, the proportional control valve 32 is switched to the channel 4, and the rod 12 of the hydraulic pusher cylinder 1 is returned in the contracting direction at high speed. The hydraulic cushion cylinder 2 energizes the second solenoid valve 34 at the same time as the start, and sets the direction of contraction of the rod 12 to a low back pressure. The second solenoid valve 34 is turned off by turning on the speed reduction 18 to increase the back pressure. When the back pressure is low, the pressed form groups 3 and 3 are sandwiched so as not to advance, and when the back pressure is high, the form groups 3 and 3 during high-speed frame feeding are decelerated.
[0019]
Next, FIG. 6 shows a state in which the hydraulic cushion cylinder 2 has been re-started. That is, after the pushing of the hydraulic pusher cylinder 1 is completed, the rods 12 of the hydraulic cushion cylinder 2 are contracted until the cut end 20 is turned on, so that gaps 4 and 4 are provided before and after the mold 3 in front of the hydraulic cushion cylinder 2. Thereafter, after the mold 3 in front of the hydraulic cushion cylinder 2 is carried out of the line, the rod 12 extends until the molding end 21 is turned on, and returns to the original position shown in FIG. At the same time as the re-start of the cushion cylinder 2, the second solenoid valve 34 is energized to reduce the back pressure.
[0020]
Next, FIG. 7 shows a control process diagram of the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2 during normal operation, and FIG. 8 shows an operation speed diagram. In the control process diagrams and the operation speed diagrams shown in FIGS. 7 to 12, the hydraulic pusher cylinder 1 is set to PS, the hydraulic cushion cylinder 2 is set to CC, the burrs end 17 is B, the speed reduction 18 is GS, and the speed end 19 is GS. Is denoted by G, the edge 20 is denoted by K, and the edge 21 is denoted by M.
At the time of normal operation, the hydraulic pusher cylinder PS side rod 12 is at the contracted end, the burrs end 17 is turned on at the ate 22, the hydraulic cushion cylinder CC side rod 12 is at the extended end, and the molding end 21 is at the ate 22. At the time of starting from the state where it is ON.
[0021]
FIG. 9 shows a control process diagram of the hydraulic pusher cylinder PS and the hydraulic cushion cylinder CC when the emergency stop is turned on at the time of high-speed feed, and FIG. 10 shows an operation speed diagram. When the emergency stop is turned on, the pumps of the hydraulic units 36, 36 are stopped for both the hydraulic pusher cylinder PS and the hydraulic cushion cylinder CC, and the power supply to all the solenoid valves is turned off. In this case, the hydraulic cushion cylinder CC side has a high back pressure, and the form groups 3 and 3 being conveyed are rapidly decelerated and stopped, so that the hydraulic circuit operates on the safe side.
[0022]
Further, FIG. 11 shows a control process diagram of the hydraulic pusher cylinder PS and the hydraulic cushion cylinder CC when restarting from an intermediate stop, and FIG. 12 shows an operation speed diagram. The restart from the halfway stop means that the rod 12 on the hydraulic pusher cylinder PS side is not at the contracted end and the return end 17 is OFF, and the rod 12 on the hydraulic cushion cylinder CC side is not at the extended end, and This is a case where the operation is started from a state in which one or both ends of the end 21 are OFF.
[0023]
At the time of restarting from an intermediate stop, such as after an emergency stop, as in the above condition, the form groups 3, 3 are not necessarily sandwiched between the hydraulic pusher cylinder PS and the hydraulic cushion cylinder CC. A gap 4 is generated between the hydraulic pusher cylinder PS, the hydraulic cushion cylinder CC, and the mold 3 because the form groups 3 and 3 advance due to inertial force. Therefore, the hydraulic pusher cylinder PS and the proportional control valve 32 send the mold 3 at medium speed only in the channel 2 (CH2) until the end 19 is turned on. In this case, since the inertia force at the time of deceleration of the mold groups 3 and 3 is small, when the hydraulic cushion cylinder CC side is set to a high back pressure, the hydraulic pusher cylinder PS may not be able to push the hydraulic cylinder. Therefore, the hydraulic cushion cylinder CC energizes the second solenoid valve 34 from the start of the restart to reduce the back pressure. In this way, at the time of restarting from a halfway stop, low-speed transport is performed by control of a process different from that during normal operation.
[0024]
【The invention's effect】
As is clear from the above description, the present invention employs a two-pressure control system using a proportional control valve for control on the hydraulic pusher cylinder side and a solenoid valve for deceleration for control on the hydraulic cushion cylinder side, so that There are various effects such as the ability to transport the mold frame at high speed without impact, to eliminate damage due to impact such as mold dropping, and to reduce the collision noise when the frame is moved to the gap.
[Brief description of the drawings]
FIG. 1 is a basic device configuration and a hydraulic piping system diagram of the present invention.
FIGS. 2A and 2B are a front view and a plan view of an apparatus configuration in an original position.
FIGS. 3A and 3B are a front view and a plan view of the apparatus configuration when the frame is moved to a frame.
FIGS. 4A and 4B are a front view and a plan view of the apparatus configuration in a deceleration start state.
FIG. 5 is a front view and a plan view of a hydraulic pusher cylinder having a device configuration, in a state at the time of completion of pushing.
FIGS. 6A and 6B are a front view and a plan view of a hydraulic cushion cylinder having a device configuration, in a state at the time of completion of kick.
FIG. 7 is a control process diagram during normal operation.
FIG. 8 is an operating speed diagram during normal operation.
FIG. 9 is a control process diagram during an emergency stop.
FIG. 10 is an operation speed diagram at the time of an emergency stop.
FIG. 11 is a control process diagram at the time of restart.
FIG. 12 is an operation speed diagram at the time of restart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hydraulic pusher cylinder 2 Hydraulic cushion cylinder 3 Form 4 Gap 12 Rod 13 Frame pushing head 17 Burr end (B)
18 Iki deceleration (GS)
19 Live end (G)
20 Kiki edge (K)
21 Mold edge (M)
22 ate 23 long ate 31 controller 32 proportional control valve 33 first solenoid valve 34 second solenoid valve 35 logic valve

Claims (5)

A method of transporting a form group arranged in series by a hydraulic cylinder of a form group, wherein the form group is sandwiched between a hydraulic pusher cylinder and a hydraulic cushion cylinder and intermittently carried at a pitch of one form.
When there is a gap between the hydraulic pusher cylinder, the mold and the hydraulic cushion cylinder, operate the hydraulic pusher cylinder at low speed to push out the series of formwork groups and push the frame of the hydraulic cushion cylinder with the mold in front of the hydraulic cushion cylinder. A step of pushing the head to align the frame,
With the formwork group sandwiched between the hydraulic pusher cylinder and the hydraulic cushion cylinder, the hydraulic pusher cylinder is operated at a high speed and the hydraulic cushion cylinder is switched to a high back pressure state in the deceleration range, thereby clamping the formwork group. A step of carrying the form group at a pitch of one form while maintaining the state;
After the hydraulic pusher cylinder and the hydraulic cushion cylinder are stopped, the hydraulic cushion cylinder is again contracted to provide a gap before and after the mold in front of the hydraulic cushion cylinder,
A method of transporting a group of molds by a hydraulic cylinder, comprising: If the emergency stop is turned on during high-speed feed, the pumps of the hydraulic unit are stopped for both the hydraulic pusher cylinder and the hydraulic cushion cylinder, and all the solenoid valves are turned off. 2. The method according to claim 1, wherein the hydraulic circuit is operated on the safe side because the group of formwork being transported is rapidly decelerated and stopped. 2. The method according to claim 1, wherein, when restarting from the middle stop, low-speed transfer is performed by control of a process different from that of the normal operation. This is a transfer device using a hydraulic cylinder of a formwork group composed of a hydraulic pusher cylinder 1 and a hydraulic cushion cylinder 2 which are disposed opposite to a line start end and a line end and have a rod 12 and a frame pushing head 13 at the end. ,
The hydraulic pusher cylinder 1 is provided with a proportional control valve 32 controlled by a controller 31 to form a hydraulic pipe capable of high-speed, medium-speed, and low-speed control.
The hydraulic cushion cylinder 2 is provided with a second solenoid valve 34 that is controllable via the first solenoid valve 33 and switches back pressure in the direction in which the rod 12 contracts. 3. A transfer device using a hydraulic cylinder for a group of molds, wherein the hydraulic pipe is configured to reduce the speed of 3. 5. The transfer device according to claim 4, wherein the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2 are further provided with logic valves 35, 35, respectively. 6.

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