JP2517530B2 - Continuous molding vulcanizer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion molding machine for producing a rubber molded article, particularly a rod-like or tubular article, without using a mold and without applying pressure. The present invention relates to an apparatus for continuously vulcanizing and molding under a normal pressure (no pressure) condition by being connected to. [0002] Conventionally, in order to manufacture a rod-shaped or tubular rubber molded product represented by a rubber roll, press molding using a mold or pressure vulcanization molding using a pressure can is performed. there were. For example, when a rubber roll is produced by molding,
As shown in FIG. 9, there are a case (I) in which the shaft (a) is inserted before vulcanization and a case (II) in which the shaft (a) is inserted after vulcanization. In both cases, before the vulcanization by the extruder (b). The materials (e) and (i) are prepared and vulcanized and molded by a vulcanizing can (f) or a vulcanizing press (g). In the case of a vulcanizing press (g), the size is determined using a mold, and in the case of a vulcanizing can (f), the vulcanizing can (f) is protected by putting it in an iron pipe so that the shape is not deformed. )
It is heated and vulcanized. In either case of (I) and (II),
The required pressure is required to prevent the rubber from expanding due to heating. In addition, in both cases (I) and (II), the material is continuously formed by the extruder (B), but the vulcanization step requires a required vulcanization time, which is generally the case. In both cases (f) and (g), a vulcanization time of 10 to 30 minutes is required. For this reason, in these methods, the vulcanization process is inevitably performed in a batch method, which has been a bottleneck for rationalization and labor saving of the subsequent steps (h). Naturally, these methods have various problems such as a limit in cost reduction. Various continuous vulcanizing devices have been developed for extruded products (continuously long products with the same cross section, such as rubber hoses and various profile products such as automobile window frames). As a conventional continuous vulcanizing device, as shown in FIG. 7, a vulcanizing device is arranged in a straight line with the extrusion direction of the extruder, and a rod-shaped or tubular rubber processed product extruded by the extruder (hereinafter referred to as a work piece). W) was vulcanized while being conveyed in the vulcanizing device in the same direction along the extrusion axis, and finally cut into a desired length by a cutting machine. [0007] When a conventional press vulcanization molding method using a press or pressure can is manufactured using a conventional continuous vulcanizing apparatus as shown in FIG. 7, Since the work W being vulcanized contacts the lower conveyor belt or roller in the same state from the beginning to the end, the contact portion is flattened as shown in FIG. However, there is a drawback that the work W is deformed or the surface or irregularity of the belt or roller is attached to the lower contact surface of the work W. Such a deformation not only impairs the appearance of the work W, but in the case of a product in which roundness is particularly required, as shown in FIG. 8B, the outer diameter is ground (cut) or cut. In doing so, the polishing (cutting) cost increases, so much polishing (cutting) time and material waste, as well as the loss of heat energy spent for vulcanizing the material in the extra polishing (cutting) part, etc. There was a problem that occurred. The present invention has been made in order to solve the above-mentioned conventional problems, and the purpose thereof is to omit various equipment such as a duct for hot air circulation in addition to a case for a heater or a fan. Not only to reduce the cost, but also to prevent wasteful dissipation of heating energy to improve the heating efficiency, and to continuously mold the rubber products that can heat the work under uniform temperature conditions. To provide a sulfurizer. The continuous molding and vulcanizing apparatus of the present invention comprises an extruder for extruding and molding a long rod-like or tubular work with a molding die, and heating and vulcanizing the work. In a device comprising a vulcanizing device for vulcanization, a partition is arranged above the work transfer path in the furnace body of the vulcanizing device to form a hot air outlet near one side wall of the furnace body, and A hot air outlet is formed near the side wall, and a heater and a fan are provided above the partition wall to blow hot air toward the work from the hot air outlet and to circulate while ejecting from the hot air outlet. And It is also characterized in that the reflux direction of the hot air is alternately changed to the opposite direction for each of the plurality of heating zones divided along the conveying direction of the work. An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a rubber extruder having a hollow cylinder 1a in which an extrusion screw 1b is rotatably inserted, and a tip portion of the cylinder 1a (near the tip portion of the extrusion screw 1b). Head 1
c is attached, and a molding die 1g is attached to the outlet of the tip. 1d is an extrusion screw 1b
1e is a speed reducer, 1f is a speed reducer, 1f is a hopper which is a rubber supply port, and inside thereof is a feed roller 1h for forcibly and stably feeding the rubber raw material into the extrusion screw 1b. Is rotatably accommodated. A cutting machine 2 cuts a long rubber processed product (hereinafter referred to as a work W) continuously extruded by the rubber extruder 1 into a predetermined length.
It is composed of a limit switch 2a, a rotary cutting blade 2b, a driving motor 2c and the like. Denoted at 3 is a push-out pusher device which, after being cut by the cutting machine 2, feeds the work W fed axially on the belt 3a in the lateral direction, that is, in the direction perpendicular to the axial direction of the work W. Photoelectric switch 3
b, a flat plate-shaped pusher 3c, a cylinder 3d for operating the pusher 3c, and the like. Reference numeral 4 denotes a feed conveyor, which is a delivery conveyor for sequentially supplying the work W delivered by the delivery pusher device 3 to the subsequent vulcanizing device 5. The vulcanization device 5 includes a roller conveyor 6 that conveys the work W, a tunnel-shaped furnace body 7 that surrounds the roller conveyor 6 and a heating space above the roller conveyor 6, a heating device 9, and the like. In the roller conveyor 6, the drive chain 6a is wound around the sprockets 5a which are rotatably attached to both ends of the main body frame of the vulcanizer 5, and the sprocket 5a shown in FIG.
As is clear from FIG. 4C, a large number of rollers 6b are rotatably arranged side by side on the drive chain 6a, and a sprocket 6c is integrally attached to one side of the roller 6b. Of course, the roller 6b is subjected to an effective surface treatment for preventing the work W from adhering.
The sprocket 6c of the roller 6b has a fixed chain 6d fixed to the rail in the furnace body of the vulcanizer 5 in the B block which occupies most of the stroke of the vulcanizer 5.
Is engaged with. Therefore, as is apparent from FIG. 4B, when the roller 6b is moved in the direction of the arrow by the drive chain 6a, the sprocket 6c is fixed to the fixed chain 6d.
Since it rolls up, the roller 6b moves forward while rotating (spinning) in the direction of the arrow. In block A, which is the first stroke of the vulcanizer 5, the sprocket 6c of the roller 6b engages with the rotating chain 6e arranged on the upper side, as shown in FIGS. 5A and 5B. And the rotating chain 6
Since e is rotationally driven so as to move in the same direction as the drive chain 6a and at a speed faster than this, the roller 6b moves while rotating in the direction of the arrow as in the B block. The rotation state of the roller 6b can be adjusted appropriately by changing the speed of the rotary chain 6e. The block A of the vulcanizer 5 is a work W.
The work W is heated to a high temperature by the far infrared heater 8 or the like for the purpose of quickly raising the temperature to the vulcanization temperature, quickly hardening or softening the outer periphery of the work W, and solidifying the shape. . The B block of the vulcanizer 5 is 300
It is a zone where the work W is vulcanized while being kept at an appropriate temperature by hot air having a low temperature up to about 0 ° C. This B block is divided into a plurality of zones, and the cross section of one zone is shown in FIG. In FIG. 6, a flow path is formed by a partition wall 9a above the heating chamber, and a fin heater 9b and a fan 9c are arranged in the flow path.
Therefore, the air heated by the fin heater 9b is circulated in the direction of the arrow by the fan 9c and moves while rotating on the roller 6b of the roller conveyor 6.
Blow hot air on. In addition, 9d is a temperature sensor,
The temperature of the fin heater 9b is adjusted to control the hot air temperature. An exhaust port 9e is provided on the ceiling of the heating chamber so that harmful gas and the like generated by heating can be exhausted. The circulation direction of the hot air is designed so as to circulate in the opposite direction for each zone, so that the work W as a whole can be vulcanized under uniform temperature conditions. Next, the operation of the apparatus of the above embodiment will be described. First, a rubber material is supplied from the hopper portion 1f of the rubber extruder 1, kneaded and plasticized by the extrusion screw 1b, and the gas and foaming components contained in the rubber are deaerated by passing through the vent zone, A continuous rod-shaped or tubular work W is formed by the die 1c. The formed long work W is sent to the cutting machine 2 arranged in the axial direction. In the cutting machine 2, the limit switch 2a, the rotary encoder, or the like detects that the sent long work W has reached the set cutting position, and immediately operates the cutting blade 2b.
The work W is cut into a predetermined length dimension. The cut work W is directly transferred to the belt 3
It is sent to the payout pusher device 3 by a. When the work W sent to the payout pusher device 3 reaches a predetermined payout device, the photoelectric switch 3b detects this and the cylinder 3d is activated to move the work W laterally by the pusher 3c.
That is, the work W is dispensed in a direction perpendicular to the axial direction. The work W delivered by the pusher 3c is sent to the roller conveyor 6 via the feed conveyor 4 and the fifth A
As shown in the figure, it rides between the adjacent rollers 6b. As described above, since the rollers 6b are all rotated in the direction of the arrow, the work W placed on the roller 6b is also rotated in the direction of the arrow due to frictional contact with the roller 6b. In the block A of the vulcanizer 5, the work W is heated by the high-temperature radiant heat from the far-infrared heater 8 while rotating (spinning), and is transferred to the right. In this way, the work W
At the beginning of the vulcanization process, it is once softened by the above-mentioned high temperature heating, but since it is heated while rotating as described above, it can be maintained in a state close to a perfect circle extruded by the roller 6b. However, even if the cross section is distorted such as an ellipse, it is positively corrected and returned to a perfect circle or a state close to this. The work W also moves while rotating in the block B, and is uniformly heated by the circulating hot air whose temperature is controlled to a predetermined temperature as described above. The vulcanization conditions are
It can be freely set by appropriately selecting the heating temperature, the speed of the roller conveyor 6, and the like. The work W is not only heated by the radiant heat or circulating hot air as described above, but also the roller 6b of the roller conveyor 6 has already received a high temperature due to these heats. Since it rolls while making direct contact, it is also heated by receiving heat conduction from the roller 6b. EFFECTS OF THE INVENTION 1) A partition is disposed above the work transfer path in the furnace body of the vulcanizer to form a hot air outlet near one side wall of the furnace body and near the other side wall. A hot air outlet is formed, and a heater and a fan are provided above the partition wall to blow hot air toward the work from the hot air outlet and to circulate while ejecting from the hot air outlet. In addition to the case for heaters and fans, equipment such as hot air circulation ducts can be omitted to reduce costs compared to conventional cases in which a fan, fan, etc. are installed outside, and waste of heating energy The heat dissipation can be prevented and the heating efficiency can be improved. 2) Since the heat reflux direction is alternately and reversely changed for each of the heating zones divided into a plurality of along the workpiece conveying direction, the workpiece is kept at a uniform temperature condition. It can be heated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a side view of the vortex device. FIG. 3 is a left side view of FIG. FIG. 4A is a partially enlarged plan view of a roller conveyor,
(B) is the side view, (C) is sectional drawing which followed CC line of (B). 5A is a side view of a roller conveyor entrance portion, and FIG. 5B is a side view taken along line BB of FIG. FIG. 6 is a cross-sectional view of a vulcanizer. FIG. 7 is a layout view of a conventional device. FIG. 8A is an explanatory view showing a deformed state of the work,
(B) is an explanatory view showing a grinding allowance of the work. FIG. 9 is a process diagram of a conventional batch-type molding and vulcanizing apparatus. [Explanation of Codes] 1 rubber extruder 1a cylinder 1b extrusion screw 1c head 1d motor 1e speed reducer 1f hopper 1g molding die 1h feed roller 2 cutting machine 2a limit switch 2b cutting blade 2c motor 3 payout pusher device 3a belt 3b limit switch 3c Pusher 3d Cylinder 4 Feed conveyor 5 Vulcanizing device 5a Sprocket 6 Roller conveyor 6a Drive chain 6b Roller 6c Sprocket 6d Fixed chain 6e Rotating chain 7 Furnace body 8 Far infrared heater 9 Heating device 9a Partition wall 9b Fin heater 9c Fan 9d Temperature sensor 9e exhaust port

Claims (1)

(57) [Claims] (1) An apparatus comprising: an extruder for extruding and molding a long rod-shaped or tubular work by a molding die; and a vulcanization device for heating and vulcanizing the work. In addition, a partition wall is arranged above the work transfer path in the furnace of the vulcanizer to form a hot air outlet near one side wall of the furnace body and a hot air outlet near the other side wall. A continuous molding vulcanizing apparatus, characterized in that a heater and a fan are provided above the partition wall to blow hot air from the hot air outlet toward the work and to circulate while discharging the hot air from the hot air outlet. (2) The recirculation direction of the hot air is alternately and inversely changed for each zone of the heating zones divided into a plurality along the workpiece conveying direction. The continuous molding vulcanizing apparatus described in 1.