JPH0788619A - Trough type molten metal supplying device - Google Patents

Abstract

PURPOSE:To exchange only a valve seat part in the case of being incapable of sealing caused by damaging the valve seat part by constituting a valve seat sleeve with a dividable and changable structure. CONSTITUTION:The valve seat sleeve 27 is made to be a structure dividing into a sleeve part 80 and the valve seat part 81. In the case of being imcomplete condition of the closeness to molten metal caused by damaging the sealing surface 81a of the valve seat part 81, only the valve seat part 81 is changed. A screw 83a of a holding jig 83 is loosened and the holding jig 83 is taken out from the fixed plate 84. The valve seat part 81 is taken out and exchanging with the new valve seat part 81, the screwing repair of the holding jig 83 is completed. By this method, the stopping time of a machine can do in a short time and the productivity can be improved and the spare parts can do to only the valve seat part 81. The cost is reduced in comparison with the change of the whole valve seat sleeve 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gutter type hot water supply device for supplying a molten metal of an aluminum alloy or the like to an injection sleeve of a die casting machine using a gutter.

[0002]

2. Description of the Related Art Conventionally, when supplying molten metal to an injection sleeve of a die casting machine, for example, Japanese Patent Publication No. 60-2
As described in Japanese Patent No. 5220, a dedicated molten metal holding furnace is arranged near the die casting machine, and the holding furnace measures and conveys the molten metal and pours the molten metal. For measuring / conveying and pouring methods, refer to Japanese Patent Publication No. 60-2522.
As described in Japanese Unexamined Patent Publication No. 0, a method using a ladle and a method of pumping a pipe by an electromagnetic induction pump have been mainstream in practical use.

However, each of these has the following drawbacks. (1) Ladle method: The molten metal is exposed to the outside air and is oxidized, and the temperature is lowered. (2) Electromagnetic induction pump method: Since the molten metal driving force of the electromagnetic pump is weak, the measuring accuracy is poor. Further, in order to increase the molten metal propulsion force, the power supply device becomes large in scale, and the cost and space are deteriorated. Further, the cost also increases for the thermal expansion correspondence and maintenance of the pressure feeding pipe. Further, as a common drawback, a dedicated molten metal holding furnace becomes redundant, which lowers productivity.

The die casting industry is also a representative of workplaces with a bad working environment. The main causes are scattering of the mold release agent and heat dissipation of the molten metal holding furnace and its peripheral equipment. The following are the current problems with molten metal operation. (1) A large-capacity holding furnace is installed on the side of the die casting machine, and moreover, a large amount of heat is dissipated. (2) The mechanism of the hot water supply device is mainly an open type, and a large amount of heat was dissipated to the work place. (3) As a result of (1) and (2), not only the working environment is deteriorated, but also the thermal efficiency is deteriorated. To solve this problem, a small capacity, closed gutter type continuous furnace and a highly accurate metering valve device are required.

By the way, the valve type hot water supply method has not been put to practical use in the die casting industry. The main reasons for this are as follows. (1) The main method was to hold a large amount of molten metal on the side of the die casting machine. As a result, there was no valve mechanism that could withstand the high temperature atmosphere. (2) The measurement accuracy varied due to changes in the properties of the molten metal, and it was not practical.

Therefore, in order to solve these problems, the applicant company of the present invention, for example, like the invention of Japanese Patent Application No. 4-272212 which has not been published at the time of the present application, the tip of the gutter for hot water distribution. A gutter-shaped box that can be sealed is placed between the pouring port of the injection sleeve and the injection sleeve. By the siphon action of the inverted U-shaped tube provided between the tip of the hot water distribution gutter and the rear end of the gutter box, the hot water distribution gutter is automatically moved into the gutter box, As the pouring valve device, a valve seat of the drain port and a valve rod that is openable and closable with respect to the valve seat are used, and the molten metal is intermittently and quantitatively supplied from the metering pouring valve device into the injection sleeve of the die casting machine. Invented a gutter type water heater.

Japanese Patent Application No. 4-272212 has a structure as shown in FIG. In FIG. 4, reference numeral 1 denotes a hot water distribution gutter, which is also called a launder system gutter capable of unmanned hot water distribution, and usually has a molten metal receiving port on one side, depending on the number and position of die casting machines from the middle. It has a branch part. In FIG. 4, 1 shows only the tip of this branched portion. A gutter-shaped box 2 is provided so as to be swingable around the tip of the hot water distribution gutter 1 and the vicinity of the tip of the hot water distribution gutter 1 so that the inside can be hermetically sealed. . 3 is an injection sleeve of a die casting machine, 3a is a pouring port, 4 is a plunger tip slidably provided in the injection sleeve 3, and 5 is a plunger.

The gutter-shaped box body 2 is provided so as to be vertically swingable around the swing center portion 6 between, for example, an original position in a horizontal state and an inclined position in which θ = 15 degrees is lifted. Has been. Reference numeral 7 is a cylinder for vertically swinging the gutter-shaped box body 2. 8 is a stopper for adjusting the horizontal position which is the lower limit position, and 9 is a frame. The gutter-shaped box body 2 is inclined so as not to interfere with the maintenance of the injection sleeve 3 and the plunger tip 4 and to return the molten metal from the gutter-shaped box body 2 to the gutter 1. In addition, the gutter-shaped box body 2 is designed to be movable also in the horizontal direction.

Generally, the gutter-shaped box body 2 constituting the gutter type water heater arranged between the most distal end of the hot water distribution gutter 1 which is a fixed gutter and the injection sleeve 3 is mainly composed of the gutter part 11, It is composed of a gutter lid 12, and an injection sleeve 3 is provided near the tip of the gutter-shaped box body 2.
Metering pouring valve device 1 located directly above the pouring port 3a
3, and an inverted U-shaped pipe device 14 is provided on the hot water distribution gutter 1 side. The gutter part 11 is composed of a tank member 16 that comes into contact with the molten metal 15a, a heat insulating member 17 that keeps it warm, and a box body 18 that stably holds these.

The gutter lid 12 includes a heat retaining member 19 and an exterior member 20.
A heater 21 is attached to the inside of the heat retaining member 19 for retaining or heating the melt 15a in the A chamber, which is the melt passage or the melt reservoir. Besides,
The gutter lid portion 12 has the same drive mechanism 22 as a rotary / linear motion converting mechanism using a ball screw of the metering pouring valve device 13, a servomotor 23, and a reflection type photoelectric tube type molten metal surface sensor 24 for control data. A temperature sensor 25 is attached. Reference numeral 24a is a molten metal level signal generator, and 25a is a molten metal temperature signal generator. On the other hand, the metering pouring valve device 13 includes a servo motor 23, a drive mechanism 22, a ceramic metering valve rod 26, a ceramic valve seat sleeve 27, a heater 28,
It is composed of a guide pipe 29 and the like. Valve seat sleeve 27
Is embedded from the inner surface of the tank member 16 toward the bottom of the heat retaining member 17, and the valve seat sleeve 2 inside the heat retaining member 17 is embedded.
A heater 28 is embedded in the outer periphery of 7. Metering rod 2
The front end of 6 is provided so as to be able to come into contact with or separate from the lower end hole of the valve seat sleeve 27, and can be moved up and down with a rotating operation and can be opened and closed. The servo motor 2
3 receives the pouring instruction, and is controlled by the control device by various information so that accurate measurement is performed.

The inverted U-shaped tube device 14 has an inverted U-shape whose ends are respectively located in the lower part of the A chamber in the gutter-shaped box body 2 and in the lower part of the B chamber, which is the molten metal passage in the hot water distribution gutter 1. It is composed of a tube 30 and a heater 31 of an electromagnetic induction system that heats and heats the tube 30 from the surroundings, is fixed to the gutter portion 11, and moves integrally when the entire gutter box body 2 swings. In the heat retaining member 32 portion of the hot water distribution gutter 1, the space 33 provided around the inverted U-shaped tube 30 is a movement allowance at this time. The inverted U-shaped pipe device 14 allows the molten metal 15b to pass through and move the entire hot water supply device.

A heat insulating material 35 is arranged between the gutter-shaped box body 2 and a part of the hot water distribution gutter. The heat insulating material 35 is preferably elastic, such as ceramic wool. This is because the gap changes due to the swing of the main body. 36 is a gas exhaust passage provided in the heat retaining member 19, 37 is a suction pressurizing device which is also a pressurizing / depressurizing device, 38 is a passage for an inert gas provided in the heat retaining member 19, 38a is an opening / closing valve, 39 is an inert gas It is a supply device.

FIG. 5 shows the metering pouring valve device 13 in detail, so that the tip of the ceramic metering valve rod 26 can come into contact with or separate from the lower end hole of the ceramic valve seat sleeve 27. It is installed so that it can move up and down and open and close. The upper end portion of the metering valve rod 26 is connected to the shaft 41 via a coupling portion 40 having a screw portion, a taper portion, or the like.

The coupling portion 40 is required to have a function of reliably holding the metering valve rod 26 in the high temperature atmosphere without misalignment. The metering valve rod 26 is inserted into the lower end of the holding rod 40a, and is securely held by the tapered portion 40c of the outer sleeve 40b.
An adjusting nut 54 is provided above the holding rod 40a to generate a constant surface pressure on the tapered portion 40c. Therefore, the coupling 55 and the outer sleeve 40b are provided on the upper surface 54a of the nut.
Causes a predetermined force to be applied. On the other hand, the coupling 55
Is keyed to the shaft 41, the rotary reciprocating motion of the shaft 41 can be transmitted to the metering valve rod 26.

Reference numeral 42 denotes a cylindrical body fixedly attached to a bracket 43 attached to the gutter lid portion 12.
A ball screw 44 is provided between the outer peripheral surface of the shaft 42 and the inner peripheral surface of the cylindrical body 42, and the shaft 41 is rotatable and vertically movable. Reference numeral 45 is a toothed belt pulley attached to the upper end of the shaft 41, and 46 is a toothed belt.
It is connected to the servo motor 23 which is a pulse motor shown by. Since the tubular body 42 is a fixed portion, the shaft 41, the belt pulley 45, and the like move up and down by about 15 mm while rotating. In this case, since the belt 46 is flexible,
The belt pulley 45 can be moved up and down to some extent. Therefore, the metering valve rod 26 is structured to rotate even during the valve opening / closing operation. The rotation of the metering valve rod 26 is carried out in order to remove foreign matter adhering to the valve sealing surface 27a and to make the metering valve rod 26 have an automatic centripetal property. The servo motor 23 receives a pouring command and the like,
It is controlled by various information so that accurate measurement can be performed.

Next, the operation in this example will be described step by step. 1. State at the time of starting operation (see FIG. 4) (1) A state in which the molten metal 15b is contained in the chamber B as shown in the figure, but there is no molten metal 15a in the chamber A closed by the metering pouring valve device 13 Then, the inert gas fills the A chamber through the on-off valve 38a and the passage 38. No molten metal has yet entered the inverted U-shaped tube 30. (2) The suction pressurizing device 37 is operated to reduce the pressure in the chamber A to a pressure corresponding to H, and the molten metal 15b is passed through the inside of the inverted U-shaped tube 30 and sucked into the chamber A. (3) Once the flow starts, the suction is stopped, and even if the pressure is released to the atmosphere, the siphon causes the molten metal to flow at a differential pressure of h with respect to the surface of the molten metal 15b. This differential pressure h does not change until the surface of the molten metal 15a rises and reaches the lower surface of the inverted U-shaped tube 30. After reaching, the surface of the molten metal 15a rises due to the differential pressure of Δh and Δh
= 0, that is, when the liquid levels of the molten metal 15a and 15b become the same height, the flow of the molten metal 15a through the inverted U-shaped tube 30 is stopped. (4) At this point, the servo motor control device (not shown) takes in the values of the melt surface sensor 24 and the temperature sensor 25, and waits for a pouring start signal together with other setting data such as the pouring amount.

2. Operation during production operation (normal) (1) In response to a pouring command from the die casting machine main body, the servo motor 23 is activated and the metering valve rod 26 is raised, whereby the valve is opened and the molten metal 15a is injected into the injection sleeve 3 It begins to flow in. (2) After a lapse of a predetermined time, the control device lowers the metering valve rod 26, the valve is closed, and the pouring is completed. When the metering valve rod 26 is lowered, by rotating the metering valve rod 26 about its axis, foreign substances adhering to the sealing surface of the valve seat sleeve 27 can be removed and a centripetal action can be given to the metering valve rod 26. The sealing effect becomes more stable.

(3) In this case, the temperature of the molten metal 15b in the B chamber is set to the minimum temperature T _B required for hot water distribution, and the temperature of the molten metal 15a in the A chamber is set to T _A required for casting, T _A
Carry out the operation in relation to> T _B. Therefore, the temperature of the molten metal 15a is set to a desired temperature by the action of the electromagnetic induction type heater 31 and the heater 21 that can be quickly heated. This is B
If the molten metal 15b in the room is high, a large amount of an oxide film is likely to be generated on the surface, or the molten metal may deteriorate, resulting in deterioration of quality. This is because only 15a has a necessary temperature.

(4) Further, as the heater 31 of the inverted U-shaped tube 30, an electromagnetic induction type heater is used to heat the molten metal inside and to apply the thrust in the flow direction to the molten metal inside to make the molten metal 15b in the B chamber A Move it to the room as quickly as possible. (5) In the metering control, the valve opening degree or the valve opening time of the metering pouring valve device 13 is determined based on one or more data among the molten metal surface position in the chamber A, the molten metal temperature, the molten metal viscosity, and the material characteristics of the molten metal. The amount is increased / decreased so that the amount poured into the injection sleeve 3 and the liquid surface of the molten metal 15a in the chamber A before pouring are the same each time. (6) In this case, the metering valve rod 2 is used as the monitoring value of the valve closed state.
The lower limit position error amount of 6 may be used, or the abnormal current value of the servo motor 23 may be used. (7) When the pouring is completed, an injection command is issued to the die casting machine body to complete one cycle.

[0020]

In the examples shown in FIGS. 4 and 5, since the valve seat sleeve 27 has an integral structure as described above, there are the following drawbacks. (1) The valve seat sleeve 27 and the metering valve rod 26 are repeatedly opened and closed for every metered pouring, but the valve seat sleeve 27 and the metering valve rod 26 are impacted each time the closing operation is performed. The metering valve rod 26 and the valve seat sleeve 27 are made of ceramic such as silicon nitride as a material that can withstand molten metal such as aluminum, but the ceramic is relatively weak against impact and may be damaged if a large impact is applied for some reason. There is a nature. (2) Even if it is not damaged, the sealing surface may be damaged by the entrapment of foreign matter or the like, making it impossible to seal. (3) If the metering valve rod 26 is damaged or damaged, it can be easily replaced, but if the valve seat sleeve 27 is damaged or damaged, repair is performed from the tank member 16 and the heat insulating member 17 of the gutter 11. It requires replacement, prolongs machine downtime and incurs high replacement costs. (4) The valve seat sleeve 27 is made of ceramic such as silicon nitride as described above, but it is expensive to have as a spare part. There was a drawback.

[0021]

In order to eliminate these drawbacks, in the present invention, a valve seat sleeve provided at the lower end of the tip and a valve rod that is openable / closable or rotatable with respect to the valve seat sleeve are provided. In the gutter type hot water supply device, the valve seat sleeve is configured to be split and replaceable.

[0022]

[Function] When the valve seat is damaged due to the opening / closing operation of the metering valve rod and sealing becomes impossible, the gutter-shaped box body is vertically swung by the cylinder to incline the molten metal in the gutter-shaped box body into the gutter. Replace the return valve seat with a spare. When the replacement is completed, the gutter-shaped box body is returned to the operating position and the operation is restarted.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention is an improvement of a part of the one shown in FIG. 4. Therefore, the description of the whole is omitted and only the improved part is shown in FIG. 1, FIG. 2 and FIG. Show. Figure 1
As shown in FIG. 2, 26 is a metering valve rod which is opened and closed by a valve rod driving device (not shown) in the trough 11.
Reference numeral 7 is a valve seat sleeve that abuts the metering valve rod 26 to shut off the molten metal, 28 is a heater for heating embedded in the outer periphery of the valve seat sleeve 27, and 29 is a guide pipe that forms a cylindrical partition wall.

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of the device of the present invention, in which the valve seat sleeve 27 is a sleeve part 80.
The valve seat portion 81 is divided and attached, and the divided portion is sealed by a seal packing 82. A hole larger than the outer diameter of the valve seat portion 81 is formed at a substantially central portion of a fixing plate 84 which is attached to the box body 18 with a bolt or the like at a lower end of the valve seat sleeve 27, and a peripheral surface of the hole. A screw 83a is engraved on the. After the valve seat portion 81 is attached from below the valve seat sleeve 27, a holding jig 83 having a stepped outer peripheral portion is screwed onto the screw 83a to hold the guide pipe 29 between the holding jig 83 and the valve seat portion 81. It can be clamped in.

FIG. 2 is a longitudinal sectional view of an essential part showing another embodiment of the present invention, which is a valve seat sleeve 27 having a U-shaped cross section.
The bottom portion of the valve is thickened, and a stepped hole having an uneven shape is bored there, and the valve seat portion 81 is attached to the valve seat sleeve 2.
7 is inserted from below, the small diameter portion of the valve seat portion 81 formed by superimposing discs of different sizes is superposed on the valve seat sleeve 2.
7 and the large diameter portion can be locked to the stepped portion. Further, a screw 83a is engraved on the convex portion of the lowermost step portion of the valve seat sleeve 27, and a holding jig 83 having a stepped outer peripheral portion is screwed onto the screw 83a portion to hold down the guide pipe 29. It is structured such that it can be held between the tool 83 and the valve seat portion 81.

The tip end portion 26a of the metering valve rod 26 shown in FIGS. 1 and 2 has a frustoconical shape, whereas the sealing surface 81a of the valve seat portion 81 has a tapered shape so that the metering valve rod 26 has a tapered shape.
When the tip end portion 26a of the above and the sealing surface 81a of the valve seat portion 81 are brought into contact with each other by the closing operation of the metering valve rod 26, the contact between them becomes a surface contact. Here, the tip end portion 26a of the metering valve rod 26 is not limited to the frustoconical shape, but may be a hemispherical shape, whereby linear contact is made between the valve seat portions 81 having a tapered shape, and therefore the rotational torque is reduced. Is small, and foreign matter such as an oxide film can be easily removed.

As shown in FIG. 3, a metering pouring valve device 50 provided at the tip of the gutter-shaped box body 2 includes a metering valve rod 26, a valve seat sleeve 27, a guide pipe 29 constituting a cylindrical partition wall, and a coupling. 60, a connecting rod 61, an air motor 62, a guide device 63, a gap 65, a connecting shaft 66, a flex coupling 67, a floating joint 71 and an air cylinder 72.

In the present embodiment, an air motor 62 for rotationally driving the metering valve rod 26 and an air cylinder 72 for vertical movement.
Are arranged in tandem so that they are located on the same axis as the metering valve rod 26 via the connecting means, respectively, and then the air cylinders 72 are attached to the support box 75 having both side surfaces opened.
It is configured to be hung below a floating joint 71 mounted on a rod 72a of an air cylinder 72.

A predetermined amount of molten metal 15a is poured into the injection sleeve 3 (opening operation), pouring is stopped (closing operation), and abutting on the valve seat sleeve 27 and then rotated (turning operation). The metering valve rod 26 that has been
Is connected to the connecting rod 61 by means of a connecting shaft 66 and a flex coupling 67 on the same axis line to an air motor 62 which is a valve portion rotation driving device. Connecting rod 61
Is guided by a bush 64 incorporated in the guide device 63, but a gap 65 is formed between the connecting rod 61 and the bush 64 to the extent that the difference in thermal expansion amount due to the temperature difference between the trough lid portion 12 and the trough portion 11 can be absorbed. It is provided.

The bracket 68 to which the air motor 62 is attached is connected to a floating joint 71 having an automatic centering mechanism via a tie rod 69 and a connecting plate 70.
It is suspended by an air cylinder 72.

If the drive mechanism at the upper end of the metering valve rod 26 is structured as described above, the shaft center does not change even if the temperature of the metering valve rod 26 changes significantly. Has the effect of operating smoothly.

The pouring work with the above configuration will be described. Figure 1
Shows a state in which the metering valve rod 26 descends by the action of the air cylinder 72 and comes into contact with the sealing surface 81a of the valve seat sleeve 27 after pouring into the injection sleeve 3 for a predetermined time.
In this state, while rotating the metering valve rod 26 by the air motor 62, the semi-solidified material such as aluminum or the foreign matter such as oxide adhering to the sealing surface 81a of the valve seat 81 is removed so that the molten metal 15a does not leak. To completely seal it. After that, the metering valve rod 26 may be rotated continuously until the molten metal 15a is poured into the injection sleeve 3, or may be rotated for a certain period of time so that foreign matter is rubbed by the pressing force and rotation of the measuring valve rod 26. Stop when it appears to have been removed.

Normally, a long-term continuous operation is performed under the above-mentioned condition, and the opening / closing operation is repeated by the vertical movement of the metering valve rod 26. However, when the metering valve rod 26 and the valve seat 81 are repeatedly abutted, When the sealing surface 81a is scratched or damaged due to foreign matter being caught, and the molten metal 15a cannot be completely sealed, first, the cylinder 7 provided at the bottom of the gutter-shaped box body 2 shown in FIG. Thus, the molten metal 15a in the gutter portion 11 is returned to the hot water distribution gutter 1 side by rocking and inclining to a predetermined angle. The swing center at this time is number 6.

When the molten metal 15a in the trough portion 11 is discharged, the screwing state with the screw 83a portion of the holding jig 83 is released by using a suitable tool, and the valve seat portion 8 is damaged or damaged.
1 is taken out and replaced with a new spare valve seat portion 81, and then assembled again in the state shown in FIG. 1 or 2. After this, the gutter-shaped box body 2 was tilted while the metering valve rod 26 was in the closed operation state.
To the horizontal state again and part of the molten metal 15b is inverted U-shaped tube 30
After being refluxed into the trough 11 via the and heated to the molten metal 15a having a desired temperature, the metering valve rod 26 is raised to pour the injection sleeve 3 with molten metal.

[0035]

As is apparent from what has been described above, the gutter type hot water supply apparatus according to the present invention has a valve seat sleeve provided at the lower end of the tip and a valve which can be opened, closed or rotated with respect to the valve seat sleeve. A gutter type hot water supply device with a rod, in which the valve seat sleeve is configured to be separable and replaceable, so that when the molten metal cannot be sealed due to damage or scratches on the seal part, only the valve seat part can be replaced. Since the machine stop time is short, it has the excellent effect that productivity can be greatly improved, and since the spare part only needs the valve seat part, the cost of replacing the entire valve seat sleeve is also included. The cost is greatly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of an apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an example of a metering pouring valve device.

FIG. 4 is an overall vertical sectional view showing an example of a conventional device.

5 is a vertical cross-sectional view of a main part of the conventional device shown in FIG. 4 according to the present invention.

[Explanation of symbols]

 1 gutter for hot water distribution 2 gutter-shaped box body 3 injection sleeve 8 stopper 13, 50 metering pouring valve device 14 inverted U-shaped pipe device 15a, 15b molten metal 21, 28 heater 22 drive mechanism 23 servo motor 24 molten metal surface sensor 25 temperature sensor 26 Metering Valve Bar 26a Tip Part 27 Valve Seat Sleeve 27a Sealing Surface 30 Reverse U-Shape 31 Heater (Electromagnetic Induction Type) 37 Suction Pressurizing Device 39 Inert Gas Supply Device 40 Coupling Part 44 Ball Screw 46 Belt 55, 60 Cup Ring 61 Connecting rod 62 Air motor 67 Flex coupling 69 Tie rod 71 Floating joint 80 Sleeve part 81 Valve seat part 81a Sealing surface 83 Holding jig

Claims (1)

[Claims] 1. A gutter-type hot water supply device comprising a valve seat sleeve provided at a lower end of a tip and a valve rod that is openable / closable or rotatable with respect to the valve seat sleeve, wherein the valve seat sleeve can be divided and replaced. A gutter-type hot water supply device characterized by having a configuration.