JPH105849A - Lead encasing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a lead encasing press in which the thermal distribution of a housing part is unified to prevent generation of cracks. SOLUTION: In a lead encasing press in which a screw is rotatably arranged in a center space part of a cylindrical liner 1, a metallic housing body 2 of approximately thick-walled shape is closely connected to an outside of the liner 1, a heating means and a cooling means are provided on an outer circumferential part of the housing and in the housing part inside thereof respectively, and the molten lead is extruded from a tip side of the liner 1, a spiral water- passing groove 2a in which the cooling water is passed is formed on either a connection surface to the housing body 2 in a liner 1 as the cooling means or a connection surface to the liner 1 on the housing body 2. A structure in which an intermediate housing having a water-passing groove 2a may be interposed between the liner 1 and the housing body to closely connect each part. A strip-shaped heater 3 is wound around an outer circumferential surface of the housing bodies 2,2A as the heating means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a lead machine used in a vulcanization mold extrusion process during a process of manufacturing hoses and electric wires, and more particularly, to a heating structure and cooling of a body of a lead machine. It relates to the improvement of the structure.

[0002]

BACKGROUND OF THE INVENTION A leaded machine is an extruder used in a vulcanization mold extrusion process of lead or the like when manufacturing a long rubber product such as a hose or an electric wire. A pin and a die provided at an opening of a lead extrusion passage are used. The molten lead is extruded from the gap, and the core material such as a cable is subjected to the vulcanization while maintaining a predetermined shape.
The molten lead is continuously extruded at a predetermined outflow rate by a rotary screw arranged in an extrusion passage at the center of the housing body. For example, in Japanese Utility Model Application Laid-Open No. 58-81014, a leaded machine applied at the time of manufacturing a cable is indirectly revealed.

[0003] This type of leaded machine has long-term equivalent specifications without significant changes in order to succeed and effectively utilize experience and rules of thumb accumulated over many years on delicate settings that affect the product finish. And those having substantially the same specifications are used in various fields. FIG.
Fig. 1 shows an example of the appearance of a commonly used leaded machine. FIG. 3A is a side view, and FIG. 3B is a top view. FIG.
(a) is a longitudinal sectional view showing the internal structure of the main part of the leaded machine,
4 (b) is an enlarged longitudinal sectional view showing a part of the side surface, and FIG. 5 (a) is a transverse sectional view in a direction orthogonal to the corresponding axis, and FIG. 5 (b) is a partially enlarged view thereof. It is.

[0004] In the figure, the portion denoted by reference numeral (2A) is a housing main body having a substantially annular cross section in the axial direction, and a cylindrical liner (1) is coupled to the center. A screw (9) is located coaxially inside the liner (1).
With the rotation of, molten lead is sent upward. A heating means is arranged on the outer peripheral side over the entire circumference of the housing body, and a cooling means is arranged inside, and by appropriately controlling both, the temperature of the innermost layer liner is maintained at a desired temperature to maintain a state of molten lead. Adjust. Reference numeral (7) is an inlet for molten lead. The housing body is mainly covered with a heat insulating material (5).

In the conventional apparatus, a linear heater (4) (ring heater) is used as a heating means as shown in FIG.
It is wound around the outer surface of the central part, and a through hole is provided inside the housing body (intermediate part) as a cooling means, and the housing body is cooled by passing water through the through hole. ing. Reference numeral (6) denotes a connecting pipe through which cooling water flows.

A semicircular groove (2b) is continuously spirally cut in the circumferential direction on the outer periphery of the housing body (2A) for heating (see also FIG. 5 (a)). ) And a linear heater (4) is wound around it, and when the device is operating, it is appropriately energized and controlled by a control device to generate heat, so that the inner layer finally joined to this through the housing body (2A) Heat liner (1).

A cooling water passage (2c) is provided in the housing body (2A) along the circumferential direction for cooling.
By circulating the cooling water through the cooling water passage (2c) and circulating the inside of the housing main body, the housing main body can be appropriately cooled, and the temperature of the liner (1) is controlled to a desired value together with the heating value control of the heater. It has become.

As shown in the enlarged cross-sectional view (part) of FIG. 2 (b), the cooling water passage (2c) is formed so that a linear hole is connected from the outside of the housing body (2A) so that the space portion is successively connected. After opening sequentially in a spiral shape, the opening communicating with the outside unnecessarily is closed with a plug (2d), thereby forming a cooling water channel that gradually rises while circulating continuously in a folded line inside the housing body. . A connection pipe (6) is joined to the predetermined opening.

[0009] The structure of the above-mentioned cooling water channel requires a large amount of time for forming, requires a large amount of time for assembling, and requires a large number of plugs (2d). As a result of deformation due to heat history due to the use of the plug, there is no accident that the plug (2d) comes off or a gap is formed between the housing body (2A) and the plug (2d) and water leaks. And, in the conventional leaded machine as described above, there was a problem that cracks may occur due to poor heat distribution due to the structure of the heating means and the cooling means.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described actual condition of a conventional leaded machine. The purpose is to propose a new structure of a leaded machine that also allows for lower prices. In addition, a structure suitable for a case where the same improvement is performed on only the necessary parts of the existing leaded machine will also be disclosed.

[0011]

According to the present invention, a screw (9) is rotatably disposed in a central space of a cylindrical liner (1), and is formed of metal on the outer surface of the liner (1). A thick-walled cylindrical housing body (2) is tightly joined, and a heating means is provided on the outer periphery of the housing, and a cooling means is provided in the housing part on the inner side, and molten lead is pushed out from the tip side of the liner (1). The liner as a cooling means for the machine
A spiral water passage groove (2a) through which cooling water is inserted into either the connection surface with the housing body (2) in (1) or the connection surface with the liner (1) in the housing body (2). To form

A screw (9) is rotatably disposed in a central space of the cylindrical liner (1), and the liner (1)
A metal-made, substantially thick, cylindrical housing body with a metal, thick-walled, cylindrical intermediate housing (2 ') closely interposed outside
(2A ′) is tightly bonded and provided with a heating means on the outer peripheral part of the housing and a cooling means in the inner housing part, and as a cooling means in a leaded machine for extruding molten lead from the front end side of the liner (1). A spiral water passage groove (2a) through which cooling water is inserted is formed on either the inner peripheral surface or the outer peripheral surface of the intermediate housing (2 ').

As a heating means, a belt-shaped heater (3) is wound around the outer peripheral surface of the housing body (2, 2A).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiments] The present invention will be described below in detail with reference to embodiments and the accompanying drawings. 1A and 1B show the periphery of a housing which is a main part of a leaded machine according to an embodiment of the present invention. FIG. 1A is a side sectional view (part), and FIG.
Is a lateral sectional view thereof.

Also in the embodiment, a cylindrical liner (1) is connected to the center of a housing body (2) having a substantially annular cross section in the axial direction. Cooling means is provided. That is, a plurality of belt-shaped heaters (3) as heating means are wound around the outer circumference of the housing body over the entire circumference, and a water passage groove (2a) as cooling means is spirally formed on the inner circumference side. They are arranged continuously. Other parts that do not appear in the drawings of the embodiment may be the same as the above-described conventional one.

The liner (1) is formed in a cylindrical shape with a metal selected in consideration of thermal conductivity and wear resistance. Liner
A substantially thick cylindrical housing body (2) is tightly joined to the outer surface of (1). This housing body (2)
A semicircular groove (water passage groove: 2a) extending obliquely in the circumferential direction is continuously formed in advance on the inner periphery, that is, the contact surface, as a cooling means, and has a spiral shape as a whole. Therefore, as shown in the figure, when the cooling water is combined with the liner (1) in close contact with the liner, a water passage through which the cooling water flows at a certain distance from the axis is formed. Both ends of the water passage (water passage groove) are opened radially outward, and a connecting pipe (6) (not shown) is joined thereto.

In the cooling means provided by the water passage groove (2a), the cooling water flows from a heating means (a belt-shaped heater) on the outer peripheral side to a water passage located at a fixed distance from the liner, resulting in a heat distribution in the housing portion. And the occurrence of cracks can be prevented. Further, since it is only necessary to form a groove in the inner peripheral surface of the housing main body, the manufacturing is simplified and the cost of the apparatus is greatly reduced.

A plurality of belt-like heaters (3a, 3b,...) As heating means are closely wound and fixed on the outer peripheral surface of the same housing body (2), and are controlled to be supplied by an external power supply. . Since the curved strip heaters (3) are densely arranged on the outer periphery, the heat distribution in the housing is uniform, cracks can be prevented, and the thermal efficiency is high.

In the central space of the liner (1), a screw (9) is coaxially arranged and rotated so that molten lead is sent upward and extruded from the upper end. By appropriately controlling the calorific value of the strip heater and the flow rate of the cooling water, the state of the molten lead is adjusted while maintaining the temperature of the innermost liner at a desired temperature. The side surface of the housing portion is covered with a heat insulating material (not shown).

In the above embodiment, the water passage groove (2a) is formed on the inner peripheral surface of the housing body (2), but a similar water passage groove may be provided on the liner side. FIG. 2 (a) is a side sectional view (partly) around a housing showing an example of such a configuration.
It is. In the present embodiment, a liner (1
2), a semicircular groove (water passage groove: 1a) extending obliquely in the circumferential direction is continuously formed in a spiral shape as a cooling means on the outer peripheral side surface of ´). A thick-walled cylindrical housing body (2B) is tightly connected to the outer surface of the liner (1 '), and a water passage through which cooling water flows at a fixed distance from the axis is also formed on the tight contact surface. . Therefore, the heat distribution becomes uniform and cracks can be prevented. Processing of the water passage groove (1a) is extremely easy. Band heaters (3a, 3b, ...) are wound around the outermost periphery.

FIG. 2 (b) is a side sectional view (part) of the housing showing an example of a structure capable of replacing a worn liner. In the embodiment shown in the figure, a metal-made intermediate housing (2 ') having a predetermined thickness and a cylindrical shape is first closely attached to the outside of the liner (1), and a metal-made substantially thick cylindrical housing is further provided on the outer peripheral side. It has a three-layer structure in which the main body (2A ') is tightly bonded.

A spiral water passage groove (2a) through which cooling water is inserted is formed on the inner peripheral surface of the intermediate housing (2 '), whereby the liner (1) and the intermediate housing (2') are connected. A water passage as a cooling means as described above is secured in the contact surface portion. Even in this configuration, the heat distribution is uniform and cracks can be prevented. Needless to say, the processing of the water channel (1a) is easy.

Although the above-mentioned members are all made of metal, the material of each member is selected in consideration of the respective coefficient of linear expansion, and the coefficient of linear expansion of the intermediate housing (2 ′) is set to Smaller and larger than the linear expansion coefficient of the housing body (2A ') (linear expansion coefficient; liner> intermediate housing>
By selecting the material as in the case of the housing body, separation (extraction) between the members is prevented from being caused even by thermal stress repeatedly generated during operation of the apparatus.

In this embodiment, belt heaters (3a, 3b,...) Are wound around the outer peripheral surface of the housing body as heating means. In addition, the heating means and the cooling means of the above-described embodiment function independently. Even if only one of them is implemented, each contributes to the uniformization of the heat distribution of the housing part. -Both cooling sources are concentric and a very good uniform heat distribution is obtained, which is more preferable.

[0025]

As described above, according to the present invention, the screw is rotatably disposed in the central space of the cylindrical liner, and the metal-made substantially thick cylindrical housing body is provided on the outer surface of the liner. In a leaded machine which is provided with a heating means on the outer peripheral part of the housing and a cooling means in the housing part on the inner side of the housing and extrudes molten lead from the front end of the liner, the cooling means is connected to the housing body in the liner. A spiral water flow groove through which cooling water is inserted is formed on either the surface or the coupling surface with the liner in the housing body, so that the heat distribution of the housing portion becomes more uniform during operation of the device, and cracks are generated. Generation can be prevented. Also, the device manufacturing cost is reduced.

A screw is rotatably disposed in the central space of the cylindrical liner, and a metal-made, substantially thick-walled cylindrical intermediate housing is closely attached to the outside of the liner. Tightly join the cylindrical housing body,
In a leaded machine having a heating means on the outer peripheral part of the housing and a cooling means in the inner housing part and extruding molten lead from the tip side of the liner, the inner peripheral surface of the intermediate housing or the outer peripheral surface of the intermediate housing may be used as a cooling means. A spiral water passage groove through which the cooling water is inserted may be formed in either one of them, and the effect of preventing cracks due to a uniform heat distribution can be obtained as described above.

A screw is rotatably disposed in the central space of the cylindrical liner, and a substantially thick cylindrical housing body made of metal is tightly connected to the outer surface of the liner. In a leaded machine provided with a heating means and a cooling means in the inner housing portion and extruding molten lead from the tip side of the liner, a configuration in which a belt-shaped heater is wound around the outer peripheral surface of the housing body as the heating means, By doing so, the heat distribution in the housing portion becomes more uniform, and the occurrence of cracks can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a leaded machine according to an embodiment of the present invention.
(a), and a cross-sectional view (b) showing a part thereof.

FIG. 2 is a side sectional view (a) showing a main part of another embodiment of a leaded machine according to the present invention, and a cross sectional view (b) of a main part showing still another embodiment.

FIG. 3 is a side view (a) showing an example of a conventional leaded machine, and a corresponding top view (b).

FIG. 4 is a side sectional view (a) of the leaded machine of FIG. 3 and a side sectional view (b) showing an enlarged main part thereof.

FIG. 5A is a cross-sectional view showing a conventional leaded machine, and FIG.

[Explanation of symbols]

 (1) ... liner, (2, 2A) ... housing body, (2a) ... water passage groove, (2A ') ... housing body, (2') ... intermediate housing, (3) ... strip heater, (9) ... screw.

Claims (4)

[Claims] A screw (9) is rotatably disposed in a central space of a cylindrical liner (1), and a metal-made substantially thick cylindrical housing body (4) is provided on an outer surface of the liner (1). 2) and a heating means on the outer peripheral part of the housing and a cooling means in the housing part on the inner side thereof.
In the leaded machine for extruding molten lead from the tip side of (1), the housing body in the liner (1) is used as a cooling means.
A spiral water passage groove (2a) through which cooling water is inserted is formed on one of the connection surface with the liner (1) and the connection surface with the liner (1) in the housing body (2). Machine to be leaded. 2. A screw (9) is rotatably disposed in a central space of the cylindrical liner (1), and a metal-made thick cylindrical intermediate housing (2) is provided outside the liner (1). ′) In close contact with a metal, substantially thick cylindrical housing body (2
A ′) is tightly bonded, and a heating device is provided on the outer peripheral portion of the housing and a cooling device is provided in the inner housing portion, and the molten lead is extruded from the front end side of the liner (1). A leaded machine characterized in that a spiral water passage groove (2a) through which cooling water is inserted is formed on either the inner peripheral surface or the outer peripheral surface of the intermediate housing (2 '). 3. The housing body (2, 2) as a heating means.
The leaded machine according to claim 1 or 2, wherein a belt-shaped heater (3) is wound around the outer peripheral surface of (A). 4. A screw (9) is rotatably arranged in a central space of the cylindrical liner (1), and a metal-made substantially thick cylindrical housing body (4) is provided on an outer surface of the liner (1). 2) and a heating means on the outer peripheral part of the housing and a cooling means in the housing part on the inner side thereof.
(1) A leaded machine for extruding molten lead from the tip side, wherein a belt-shaped heater (3) is wound around the outer peripheral surface of the housing body (2, 2A) as a heating means, and is arranged. .