JP5737089B2 - Method and apparatus for conveying a form group with temperature change by a hydraulic cylinder - Google Patents

Description

  The present invention relates to a method and apparatus for sandwiching a form group having a large temperature change, such as a form for casting, between a hydraulic pusher cylinder and a hydraulic cushion cylinder, and intermittently conveying the form by a pitch corresponding to one form. .

  As shown in Patent Document 1, a technique in which a group of molds arranged in series is sandwiched between a hydraulic pusher cylinder and a hydraulic cushion cylinder and intermittently conveyed by a pitch corresponding to one mold with no gap between them. It has been known for a long time. In Patent Document 1, a pneumatic cylinder is used as a hydraulic pusher cylinder and a hydraulic cushion cylinder. However, it is difficult to finely control the operating speed, operating distance, etc., and the pneumatic cylinder is sufficient for a heavy formwork. There was a problem that could not be handled.

  Therefore, the present applicant has previously developed a technique for conveying a form group using a hydraulic cylinder disclosed in Patent Document 2. In the conveying method of Patent Document 2, a hydraulic pusher cylinder is actuated to push out a group of molds toward the hydraulic cushion cylinder, and a frame pushing process for eliminating a gap between the hydraulic pusher cylinder, the mold, and the hydraulic cushion cylinder, and a hydraulic pusher cylinder In the deceleration region, the hydraulic cushion cylinder is switched to a high back pressure state and decelerated to convey the mold group by a pitch corresponding to one mold frame. In the method of Patent Document 2, a deceleration start position detector (quick deceleration) and an extrusion operation end position detector (iki end) are attached to the hydraulic pusher cylinder side for control.

  In the case of a typical green sand mold, the amount of thermal expansion is about 1.5 mm per frame, and the amount of change in the stop position that accompanies the temperature change when transferring 50 frames in a row is maximum. But it is 75mm. Such a stop position error can be dealt with by the method of Patent Document 2. However, since the temperature change is larger in the case of the mold used for the secondary cooling and transfer equipment of the material after unpacking, the amount of thermal expansion due to the temperature change reaches about 3.5 mm per frame, and 50 frames The maximum amount of change in the stop position that accompanies the temperature change when transporting in a row is 175 mm.

  That is, in the method of Patent Document 2, when the formwork is cold, a maximum of about 175 mm of feed (shortage of feed) occurs, and the formwork cannot be fed to a fixed position. In addition, when the secondary cooling of the material after unpacking and the transfer equipment are stopped during operation and the temperature of the mold rises excessively, the stop position of the mold exceeds the predetermined position, and the casting There was also a risk of equipment damage.

Japanese Utility Model Publication No. 62-46665 Japanese Patent No. 3680997

  Therefore, the object of the present invention is to provide an error in the stop position of the formwork even when the amount of thermal expansion of the formwork due to temperature changes is large, such as the formwork used for secondary cooling and transfer equipment of the material after unpacking. It is an object of the present invention to provide a method and an apparatus for conveying a form group using a hydraulic cylinder.

In order to solve the above problems, the present invention provides a method for transporting a form group having a temperature change by a hydraulic cylinder according to the present invention, wherein a form group having a temperature change arranged in series, a hydraulic pusher cylinder, a hydraulic cushion cylinder, In this method, the hydraulic pusher cylinders are actuated to push the mold group to the hydraulic cushion cylinder side, and the gap between the hydraulic pusher cylinder, the mold frame and the hydraulic cushion cylinder is increased. A frame moving step, a high speed operation of the hydraulic pusher cylinder, a deceleration step by switching the hydraulic cushion cylinder to a high back pressure state in the deceleration region, and a conveyance step of conveying the mold group by a pitch of one mold frame; After the mold group stops, the hydraulic cushion cylinder is further retracted to form a final process to form a gap with the mold frame. The fast acting end position and the extrusion operation end position of the hydraulic pusher cylinders in each step of, is characterized in that controlled by the position detector provided on the frame of the hydraulic cushion cylinder.

According to the present invention made to solve the above-mentioned problems, a conveying device using a hydraulic cylinder of a mold group having a temperature change according to the present invention is a mold having a temperature change arranged in series by the method according to claim 1. A device for sandwiching a group between a hydraulic pusher cylinder and a hydraulic cushion cylinder, and intermittently transporting the group by a pitch corresponding to one mold frame, wherein the hydraulic pusher cylinder is generated by a temperature change of the mold group, It is assumed that the stroke has a larger stroke than the sum of the gaps between the frame and the hydraulic cushion cylinder, and that the position detector that detects the high-speed operation end position and the push-out operation end position of the hydraulic pusher cylinder is arranged on the frame of the hydraulic cushion cylinder. It is a feature.

According to the present invention, the mold group is sandwiched between the hydraulic pusher cylinder and the hydraulic cushion cylinder, and intermittently conveyed by the pitch of one mold frame. Therefore, if the output of the hydraulic cylinder to be used is appropriately selected, a heavy mold It is the same as in the prior art that the frame can be pitch transported without giving an impact. Moreover, in the present invention, the high-speed operation end position and the push-out operation end position of the hydraulic pusher cylinder are controlled by the position detector provided in the frame of the hydraulic cushion cylinder. Is not affected by the thermal expansion of the formwork group. Therefore, even when the amount of thermal expansion of the mold due to temperature change is large, the error of the stop position of the mold can be eliminated.

  If the hydraulic pusher cylinder has a stroke larger than the sum of the gaps between the hydraulic pusher cylinder, the mold, and the hydraulic cushion cylinder generated by the temperature change of the mold group, the magnitude of thermal expansion of the mold group is small. Regardless of this, there is no risk of insufficient feed (short feed).

It is a basic device configuration and hydraulic piping system diagram of the present invention. It is the front view and top view of an original position state. It is the front view and top view of a state at the time of frame alignment. It is the front view and top view of the state at the time of the deceleration start. It is the front view and top view of a hydraulic pusher cylinder and the state at the time of pushing completion. It is a front view and a top view of a state at the time of completion of a hydraulic cushion cylinder and Kiki.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a conveyance line and a hydraulic piping system for sandwiching the mold group groups 3 and 3 between the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2 which are arranged to face each other and feeding the frame between the molds by a pitch of one mold frame. . There are various devices (not shown) between the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2, and gaps 4 and 4 are provided before and after each device and in front of the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2 as shown. is there. The hydraulic pusher cylinder 1 has a stroke sufficiently larger than the sum of the gaps 4 and 4.

  As shown in FIGS. 2 to 6, frame pushing heads 13 and 13 are attached to the tip ends of the piston rods 12 and 12 of the hydraulic pusher cylinder 1 and the hydraulic cushion cylinder 2, and guide rails 14 and 14 are attached by guide rollers 15 and 15. The postures of the hydraulic cylinders 11 and 11 are held by being sandwiched.

  As shown in FIGS. 2 to 6, the hydraulic pusher cylinder 1 is provided with a detector 17 at the edge of burrs. Further, in the hydraulic cushion cylinder 2, the detectors for the quick deceleration 18, the live end 19, the live end 20, and the moist end 21 are fixed to the frames 16 and 16. The idle deceleration detector 18 is a high-speed operation end position detector, and the idle end detector 19 is a push-out operation end position detector. The guide rails 14 and 14 are attached with vertices 22 and 22 and long vertices 23 for turning on and off each detector.

  Further, the hydraulic piping will be described with reference to FIG. First, the hydraulic pusher cylinder 1 is communicated with 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 the first electromagnetic valve 33, and is provided with a second electromagnetic valve 34 in the contraction direction of the rod 12, and performing high-pressure conveyance with a large inertia force by performing two-pressure control for switching back pressure. The formwork groups 3 and 3 are decelerated.

  The controller 31 of the proportional control valve 32 sets the live direction channel 1 (CH1) at high speed, the channel 2 (CH2) at medium speed, and the burr direction channel 4 (CH4) at high speed.

  In addition, logic valves 35 and 35 are provided in the head side hydraulic pipes of both hydraulic cylinders 1 and 2, and both hydraulic cylinders 1 and 2 are caused by oil leakage from the proportional control valve 32 and the first electromagnetic valve 33 when the hydraulic units 36 and 36 are activated. The logic valves 35 and 35 prevent the two rods 12 and 12 from jumping out. That is, when the proportional control valve 32 and the first solenoid valve 33 are in the neutral position at the edge of the hydraulic pusher cylinder 1 and the edge of the hydraulic cushion cylinder 2 (see FIG. 1), the high-pressure hydraulic fluid from the hydraulic unit 36 is used. Are closed at the respective P ports of the proportional control valve 32 and the first electromagnetic valve 33, but a phenomenon occurs in which a small amount of hydraulic oil leaks to the 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 pushed simultaneously with the hydraulic oil of the same pressure, the rod 12 of the cylinder 11 gradually protrudes because the force on the head side having a large cross-sectional area is large. It becomes. In order to prevent this state, a logic valve 35 is attached in the middle of piping on the head side of the cylinder 11.

  The logic valve 35 is closed by a valve that presses the middle of the pipe with a spring. The 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 pushing the valve with the force of the spring. When the cylinder 11 is driven by opening and closing the solenoid valve, when the cylinder rod 12 is removed, the piston is pushed by the operating pressure from the solenoid valve A port and the valve is opened. When the cylinder rod 12 is pulled, the valve is directly pushed open with hydraulic oil from the cylinder head side.

Next, a method for conveying the mold group 3, 3 will be described.
FIG. 2 shows the feed positions of the form groups 3 and 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 burr end 17 is turned on by the atte 22. In the hydraulic cushion cylinder 2, the rod 12 extends at the end, and the mod end 21 is turned on by the element 22. The gap 4 is in front of and behind the carry-in mold (left end) 3 and in front of the frame pushing head 13 of the hydraulic cushion cylinder 2.

  When started, the hydraulic pusher cylinder 1 sends the group of molds 3 and 3 in the extending direction of the rod 12 at a medium speed only for the proportional control valve 32 and channel 2 (CH2). The sent form groups 3 and 3 move in the direction of the hydraulic cushion cylinder 2 while absorbing the gap 4 between them, and the right end form 3 hits the frame pushing head 13 of the hydraulic cushion cylinder 2. As a result, as shown in FIG. 3, the mottle end 21 on the hydraulic cushion cylinder 2 side is turned OFF. The state of FIG. 3 shows the completion of the frame approaching process that eliminates the gap 4 between the hydraulic pusher cylinder 1, the mold 3, and the hydraulic cushion cylinder 2.

  In this way, the state shown in FIG. 3 is reached in which the mod end 21 is turned off, and the hydraulic pusher cylinder 1 sends out the formwork groups 3 and 3 at a high speed of the proportional control valve 32 and the channel 1 (CH1). In this case, the channel 1 (CH2) is not simply switched from the channel 2 (CH2) to the channel 1 (CH1), but the channel 1 (CH1) is repeatedly energized while the medium speed feed is energized. It is preferable to prevent the occurrence of feed impact.

  Next, as shown in FIG. 4, when the quick deceleration detector 18 on the hydraulic cushion cylinder 2 side, which is a detector for the high-speed operation end position, is turned on by the long element 23, the hydraulic cushion cylinder 2 is moved to the second solenoid valve. 34 is turned OFF, and switching to a high back pressure starts deceleration. If a detection omission of the ON signal of the active deceleration 18 occurs, the mold groups 3 and 3 are not decelerated, causing a problem of colliding with the hydraulic cushion cylinder 2 at a high speed. It is structured to input.

  Next, FIG. 5 shows a state where the hydraulic pusher cylinder 1 has been pushed. The rod 12 of the hydraulic pusher cylinder 1 is at the extended end, and one of the hydraulic cushion cylinders 2 is contracted and the long end 23 turns on the exhaust end 19 (the detector at the end of the pushing operation). At this time, the hydraulic cushion cylinder 2 is in the middle of contraction, and the edge 20 has not been turned on at the element 22 yet.

  Since the hydraulic cushion cylinder 2 becomes a high back pressure after the ignition deceleration 18 is turned on, the hydraulic pusher cylinder 1 is decelerated while the channel 1 (CH1) high-speed feed is energized. When the free end 19 is turned on, the channel 1 (CH1) high speed is turned off. After the fixed end 19 is turned on, after a fixed time has elapsed, 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 electromagnetic valve 34 at the same time as the start, and sets the rod 12 contraction direction to a low back pressure. The second solenoid valve 34 is turned OFF when the Iki deceleration 18 is turned ON, and the high back pressure is set. When the low back pressure is applied, the pressed mold groups 3 and 3 are sandwiched so as not to run ahead, and when the high back pressure is applied, the mold groups 3 and 3 during high-speed frame feeding are decelerated.

  Next, FIG. 6 shows the re-kiking completion state of the hydraulic cushion cylinder 2. That is, after the push-out of the hydraulic pusher cylinder 1 is completed, the rod 12 of the hydraulic cushion cylinder 2 is contracted until the end 20 is turned on, so that gaps 4 and 4 are again 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 is extended until the end of the mod 21 is turned on and returned to the original position shown in FIG. The second electromagnetic valve 34 is energized at the same time as the re-cracking of the hydraulic cushion cylinder 2 to reduce the back pressure.

  As apparent from the above description, the present invention can transfer a large mold frame without impact and at high speed, and can eliminate damage due to impact such as mold dropping. The high-speed operation end position and push-out operation end position of the hydraulic pusher cylinder are controlled by a position detector provided on the hydraulic cushion cylinder side, so that even when the amount of thermal expansion of the mold due to temperature changes is large, the mold There is an advantage that the error of the stop position of the frame can be eliminated.

DESCRIPTION OF SYMBOLS 1 Hydraulic pusher cylinder 2 Hydraulic cushion cylinder 3 Formwork 4 Gap | interval 12 Rod 13 Frame pushing head 17 Fray end detector 18 Strike deceleration detector 19 Clear end detector 20 Clear end detector 21 Modular end detector 22 Vertical 23 Long vertical 31 Controller 32 Proportional control valve 33 First solenoid valve 34 Second solenoid valve 35 Logic valve 36 Hydraulic unit

Claims (2)

It is a method of sandwiching a group of molds arranged in series with a temperature change between a hydraulic pusher cylinder and a hydraulic cushion cylinder, and intermittently transporting them by a pitch of one mold frame,
A frame moving step of operating a hydraulic pusher cylinder to push out a group of molds toward the hydraulic cushion cylinder, and eliminating a gap between the hydraulic pusher cylinder, the mold, and the hydraulic cushion cylinder;
A conveying step of operating the hydraulic pusher cylinder at a high speed, decelerating the hydraulic cushion cylinder by switching to a high back pressure state in the deceleration region, and conveying the mold group by a pitch of one mold frame;
After the mold group stops, the hydraulic cushion cylinder is further retracted to form a final process for forming a gap with the mold frame.
The hydraulic pusher cylinder in each of the above steps is controlled by the position detector provided on the frame of the hydraulic cushion cylinder for controlling the high-speed operation end position and the push-out operation end position of the hydraulic pusher cylinder. Transport method. A device for sandwiching a group of molds arranged in series with a temperature change arranged in series between a hydraulic pusher cylinder and a hydraulic cushion cylinder by the method according to claim 1, and transporting them intermittently by a pitch of one mold. ,
The hydraulic pusher cylinder has a stroke larger than the sum of the gaps between the hydraulic pusher cylinder, the mold, and the hydraulic cushion cylinder generated by the temperature change of the mold group.
A conveying device using a hydraulic cylinder of a mold group having a temperature change, wherein a position detector for detecting a high-speed operation end position and a push-out operation end position of a hydraulic pusher cylinder is arranged on a frame of a hydraulic cushion cylinder.

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