JPH0718820U - Vulcanizing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small-sized, lightweight and low-cost vulcanization device that does not require a hydraulic cylinder or the like as a pressurizing means and a highly rigid frame. [Structure] Moving means 10 for intermittently feeding the rubber belt A,
A set of heating plates 20 that can be opened and closed to sandwich the rubber belt A, an opening and closing drive means 30 that opens and closes the heating plates 20,
And a connector 4 for connecting the heating plate 20 and keeping it closed
It consisted of 0 and so on. Movable plate 21.2 of the heating plate 20
3 is provided with an airbag that inflates by introducing compressed air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vulcanizer of a type in which various vulcanizates such as an endless rubber belt are intermittently fed and are sandwiched between heating plates to be vulcanized.

[0002]

[Prior art]

 Vulcanization of rubber products is carried out by applying heat and pressure to unvulcanized molded products for a certain period of time. The heat is applied by installing an electric heating element in the mold containing the molded product, or by passing a high-temperature fluid such as steam, and the pressure is applied to the mold by a pressurizing means such as a hydraulic cylinder. It is added by pressing from. If a device having a certain stroke, such as a hydraulic cylinder, a screw jack, or a toggle press, is used as such a pressurizing means, not only pressurization but also opening / closing operation of a mold required before and after the pressurization can be performed. This is convenient because it can be performed continuously.

[0003]

[Problems to be solved by the device]

A conventional vulcanizing device that applies a force from the outside to a mold or the like by pressurizing means such as a hydraulic cylinder has not always been advantageous in terms of cost. One reason is that the pressurizing means itself requires a considerable cost. For example, when vulcanizing a rubber product, a pressure of about 10 kg / cm ² (about 1 MPa) or more is required for the product, and depending on the area of the product, a force of 10 tons (about 10 ⁵ N) or more is applied to the mold. It is not uncommon to have to apply it, but hydraulic cylinders and other devices that produce that much power are quite large and expensive. Further, in the case of a hydraulic cylinder, it is necessary to additionally install hydraulic equipment such as a pump and a valve, which are hydraulic sources, and a piping system.

Further, in order for the vulcanizer to apply a force to the mold or the like from the outside, a rigid frame having high rigidity is indispensable. Without a frame that has sufficient strength to support a reaction force equal to the total applied pressure and to withstand the bending moment, etc. generated by the reaction force, external force cannot be applied after all. is there. Such a frame is often formed in a U-shape because it is necessary to secure a space for installing a mold or the like, and a large bending moment is apt to be generated inside the frame. A simple and lightweight frame such as when applying force cannot withstand use. Therefore, the frame becomes large and the cost increases, and the vulcanizer may be difficult to handle due to the overall weight and installation space.

An object of the present invention is to provide a small-sized, lightweight and low-cost vulcanizing device that does not require a hydraulic cylinder or the like as a pressurizing means and a highly rigid frame.

[0006]

[Means for Solving the Problems]

 The vulcanizing apparatus of the present invention comprises: a) a moving means for intermittently sending the vulcanizate, b) a set of heating plates that can be opened and closed to sandwich the vulcanizate, and c) the opening and closing of the heating plates. The opening / closing drive means is provided, and d) a connecting tool for connecting the heating plates to keep them closed. Further, as described in claim 2, it is more preferable to provide a fluid-conducting expansion bag on any of the heating plates of b).

[0007]

[Action]

 The vulcanizing apparatus of the present invention vulcanizes the material to be vulcanized as follows. That is, first, the moving means in the above a) feeds the vulcanizate up to the position sandwiched by the heating plates in b). When the material to be vulcanized is a long one such as a rubber belt, it is necessary to repeat partial vulcanization with a heating plate to vulcanize the whole, so the moving means is intermittent, that is, partially. Each time the vulcanization is performed, the material to be vulcanized is sent to shift its position. If the vulcanizate is one that has been completely vulcanized in one go, the heating plate is opened and the vulcanizate to be vulcanized is taken out next to the vulcanization target. The vulcanizate to be vulcanized is intermittently conveyed by this moving means. The heating plate also serves as a mold for molding the vulcanizate or is a member dedicated to vulcanization, and two or more plates form a set, and by opening and closing each plate, the heating plate is covered. The vulcanizate can be sandwiched, and an electric heating means and a passage for high-temperature fluid can be provided to generate the heat required for vulcanization.

When the material to be vulcanized (or a portion to be vulcanized) is sent as described above, the opening / closing drive means of c) closes the heating plate. The opening / closing drive means simply opens and closes the heating plate, does not serve as a pressurizing means for applying a force required for vulcanization to the heating plate, and has a low output and is simple and compact.

The pair of heating plates that have been closed together are connected by the connecting device of d) so as to keep the closed heating plate. The connector keeps the heating plate closed while the heating plate heats the material to be vulcanized to proceed the vulcanization. Therefore, although there is no pressurizing means such as the hydraulic cylinder in the conventional vulcanizer, in this vulcanizer, the force based on the vulcanizate (which accompanies the expansion of the vulcanizate itself) or claim 2. In this case, the force due to the expansion bag of the heating plate is supported by this connector, and the force acts on the vulcanizate as a pressure for vulcanization. In addition, the connecting tool connects each sheet directly for one set of heating plates, and has a shape that does not generate bending moment, that is, a simple and lightweight straight line extending in the direction of the force generated during vulcanization. Easily constructed as a tensile member.

When the vulcanization (entire or partial vulcanization of the material to be vulcanized) is completed, the connection of the heating plate by the connecting tool is released, the heating plate is opened by the opening / closing drive means, and the vulcanization is performed from that interval. Take out the sulfide and repeat the above steps. The vulcanizate may be taken out of the heating plate by the moving means in a) (for example, when the vulcanizate is a long one such as a rubber belt), but the function of taking out the vulcanizate is the heating plate itself. It is also good to let them do it.

The vulcanizing apparatus of claim 2 has the following effect. First, in the heating plate, a fluid such as high-pressure steam is put inside the expansion bag to inflate the expansion bag, and the force is applied to the vulcanizate as pressure. Therefore, as long as the heating plate is closed by the connecting tool, the vulcanization pressure can be freely adjusted by changing the pressure of the fluid introduced into the expansion bag, and the vulcanization of the vulcanizate can be performed. It can proceed under ideal pressure. At the above-mentioned stage, by lowering the pressure of the fluid in the expansion bag, it is possible to easily disconnect the heating plate, open and close it, and take out and move the vulcanizate. It goes without saying that the apparatus according to claim 2 also does not require the pressurizing means such as the hydraulic cylinder and the highly rigid frame that supports the reaction force of the pressing force in the conventional apparatus.

[0012]

【Example】

 1 to 4 show a vulcanizing apparatus 1 which is an embodiment of the present invention. The vulcanizer 1 is a vulcanizer that uses an endless rubber belt A as a material to be vulcanized and intermittently feeds it in the longitudinal direction to vulcanize the whole. 1 is a front view showing a state where the heating plate 20 is open in the vulcanizing apparatus 1, FIG. 2 is a front view of a main part of the vulcanization device 1 in a state where the heating plate 20 is closed, and FIG. 4 is a view taken along the line IV-IV in FIG.

As shown in FIG. 1, the vulcanizing apparatus 1 includes a moving means 10 for moving around a rubber belt A, a set of three heating plates 20 and a heating plate 20 that can sandwich the rubber belt A. Opening / closing driving means 30 for opening / closing the heating plate 20, a connecting tool 40 for connecting the heating plate 20 in a closed state, a pressing roller 51 for attaching the rubber belt A to the heating plate 20, and a stand 2 assembled with these members. ing. Below, the configuration of each of these parts will be described first.

The moving means 10 has a pair of rotating rollers 11 and 12, and wraps the rubber belt A and extends it appropriately, and also rotates the driving side roller 11 to feed the rubber belt A in a fixed direction. It is a means that can be done. Two sets of the same moving means 10 (only one set is shown in the figure) are arranged in the vulcanization apparatus 1 so that another rubber belt A can be prepared during vulcanization of one rubber belt A. .

As shown in FIG. 1, the heating plate 20 is a set of three movable plates 21 and 23, which are upper and lower, and a fixed plate 22 fixed to the stand 2 at an intermediate height between them. The rubber belt A is sandwiched between the upper movable plate 21 and the fixed plate 22 and between the fixed plate 22 and the lower movable plate 23, and the vulcanization is applied to each plate 21, 22, 23. An electric heater (not shown) is embedded as a heating element for this purpose. Further, for the purpose of imparting a V-shaped cross section to the rubber belt A during vulcanization, a plurality of V-shaped grooves 22a are provided on the upper and lower surfaces of the fixing plate 22 as shown in FIG. As for the upper and lower movable plates 21 and 23, airbags 21a and 23a are provided on the upper and lower surfaces facing the fixed plate 22. The airbags 21a and 23a are made of rubber and form a bag together with the main bodies of the movable plates 21 and 23, and expand toward the fixed plate 22 when air is introduced into the bag portion. The movable plates 21 and 23 are attached to the lifting tables 35 and 36 of the opening / closing drive means 30 described later, respectively.

The opening / closing drive means 30 is a means for moving the movable plates 21 and 23 of the heating plate 20 up and down to close and open the gap between them and the fixed plate 22, which is configured as shown in FIG. is there. That is, first, the feed screw 32 in which the left screw 32a and the right screw 32b whose spiral directions are opposite to each other are formed near both ends is erected vertically by the stand 2, and this is connected to the reversible motor (with a speed reducer) 31. A left-hand feed nut 33 is fitted to the left-hand thread 32a on the upper side, and the elevating table 35 is connected to this by a spring 35b. On the other hand, a right-handed feed nut 34 is fitted to the right-handed screw 32b on the lower side, and the lifting table 36 is similarly connected via a spring 36b. Further, each of the tables 35 and 36 is provided with a linear guide 35a and 36a so as to be along the vertical rail 37 on the stand 2. When the feed screw 32 is rotated in either direction by the motor 31, the tables 35 and 36 move horizontally in parallel while keeping horizontal, but the action of the right screw 32a and the left screw 32b prevents the movement of the two. The orientation is either towards or away from each other. Since the movable plate 21 is attached to the lower surface of the upper table 35 and the movable plate 23 is attached to the upper surface of the lower table 36 as shown in the figure, the motor 31 is started to open and close the pair of heating plates 20. You can However, since the opening / closing driving means 30 cannot apply a force corresponding to the vulcanizing pressure of the rubber belt A to the heating plate 20, the output of the motor 31 is small and the feeding screw 32 is also small in diameter.

As shown in FIG. 1 or FIG. 3, the connecting tool 40 is provided on the elevating table 35 as a set of four, and when the heating plate 20 is closed by the opening / closing drive means 30, the claw 41 at the tip is moved to the movable plate. As shown in FIG. 2, it is adapted to be hooked on the elevating table 36 under the unit 23. When the claw 41 is hooked in this manner, the connecting tool 40 connects the heating plate 20 including the three plates 21, 22 and 23 in a closed state. Each connecting member 40 is a simple linear rod, but the force that can be received from the heating plate 20 is only a tensile force and there is almost no bending moment. Even if a force of 10 tons is applied, the connector 40 has no strength problem and keeps the heating plate 20 closed. As shown in FIG. 3, a horizontal shaft 42 was connected to the base end of the connector 40, and a drive source 43 such as a motor was connected to the horizontal shaft 42. Therefore, the connector 40 swivels in the vertical plane and is heated by the heating plate 20. Can be automatically connected / disconnected.

As shown in FIGS. 1 and 4, the pressing roller 51 is rotatably provided at the tip of the air cylinders 52 arranged in the upper and lower opposite directions. The rubber belt A can be smoothly attached to the heating plate 20. With the goal. That is, if the rubber belt A is pressed by these rollers 51 when the heating plate 20 is closed, the rubber belt A can be put along the heating plate 20 and pinched in a preferable state without wrinkles. As shown in FIG. 4, guide rods 53 are arranged on both sides of the cylinder 52 to prevent the position of the roller 51 from shifting, and a flexible joint (not shown) including a spring is attached to the rod of the cylinder 52. In this way, the tension of the rubber belt A during vulcanization can be easily adjusted.

In addition, in order to smoothly peel off the rubber belt A after vulcanization from the heating plate 20 (particularly the fixing plate 22), for example, at a position where the pressing roller 51 presses on both sides of the fixing plate 22, for example, A vertically separating type separating means (not shown) or the like may be provided.

In the vulcanizing apparatus 1 configured as described above, the rubber belt A can be vulcanized as follows.

1) An unvulcanized rubber belt A is stretched between the rollers 11 and 12 of the moving means 10 to extend it to a predetermined length, and the moving means 10 together with the vulcanizing apparatus 1 is suitable as shown in FIG. Set it in a cut place.

2) While extending the cylinder 52 and pressing the pressing roller 51 against the rubber belt A, the motor 31 of the opening / closing drive means 30 is activated to move the movable plates 21 and 23 up and down together with the lifting tables 35 and 36, and the fixed plate 22 is fixed. The rubber belt A is sandwiched by closing the heating plate 20 including it.

3) The closed heating plates 20 are connected as shown in FIG. 2 by rotating the connecting tool 40.

4) Energize the heater of the heating plate 20 and send pressurized air to the airbags 21a and 23a to start the vulcanization of the rubber belt A. During the vulcanization, a reaction force mainly based on the air pressure acts on the upper and lower movable plates 21 and 23, and the force is supported by the connector 40. The positions of the movable plates 21 and 23 (tables 35 and 36) when the motor 31 is stopped in 2) above due to the looseness of the connecting tool 40 and the positions during vulcanization do not completely match, Since the difference is absorbed by the springs 35b and 36b shown in FIG. 3, an unreasonable force is not applied between the feed screw 32 and the nuts 33 and 34.

5) When vulcanization of the portion sandwiched by the heating plates 20 is completed after a certain time has passed, the air of the air bags 21a and 23a is deflated and the connection of the heating plates 20 by the connecting tool 40 is released. The opening / closing drive means 30 opens the heating plate 20. The pressing roller 51 is also returned to the original position, and if there is the above-mentioned separating means, it is made to function at this time.

6) The moving means 10 intermittently feeds the rubber belt A in a certain direction by a predetermined distance. This distance should be set so that the portion that enters between the heating plates 20 to be subsequently vulcanized already includes a little vulcanized portion (that is, the vulcanization range slightly overlaps). .

7) When the above 2) to 6) have been carried out a plurality of times to complete the vulcanization of the entire rubber belt A, the rubber belt A is taken out from the vulcanizing apparatus 1 together with the moving means 10. The taken-out rubber belt A is naturally cooled while being rotated.

8) The rubber belt wound around the roller of another moving means during the vulcanization of the rubber belt A is set in the vulcanizing device 1 together with the moving means, and 2) and subsequent steps are repeated.

[0029]

[Effect of device]

 The vulcanizer of the present invention has the following effects. That is, a) A connecting tool, which can be easily configured as a simple and lightweight tensile member, keeps the heating plates closed during vulcanization, and a large hydraulic cylinder or the like as a pressurizing means is also applied. Since a high-rigidity frame that supports the reaction force is not required, the device is small and lightweight, and can be easily configured at low cost.

B) As the opening / closing driving means, a small-sized and low-output simple one that simply opens and closes the heating plate can be used instead of a large cylinder that also serves as a pressurizing means as in the conventional case. Has the same advantages as.

C) The vulcanizing apparatus of claim 2 also has the advantage that the vulcanizing pressure can be adjusted freely and that the vulcanization of the vulcanizate can proceed under ideal pressure. is there.

[Brief description of drawings]

FIG. 1 shows a vulcanizing apparatus 1 according to an embodiment of the present invention,
It is a front view which shows the state which the heating plate 20 opened.

FIG. 2 is a front view showing a main part of the vulcanizing apparatus 1 in a state where a heating plate 20 is closed.

FIG. 3 is a side view of the vulcanizing apparatus 1, which is III-III in FIG.
FIG.

4 is a side view of the vulcanizing apparatus 1 and is a view taken along the line IV-IV in FIG.

[Explanation of symbols]

 1 Vulcanizing Device 10 Moving Means 20 Heating Plates 21a / 23a Airbags (Expansion Bags) 30 Opening / Closing Driving Means 40 Connecting Tools 51 Pressing Rollers A Rubber Belts (Vulcanizates)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B29K 105: 24 B29L 29:00

Claims (2)

[Scope of utility model registration request] 1. A moving means for intermittently feeding a material to be vulcanized, a pair of heating plates that can be opened and closed to sandwich the material to be vulcanized, an opening / closing drive means for opening and closing the heating plate, and heating. A vulcanization device, comprising: a connecting tool for connecting the plates to keep them closed. 2. The vulcanizing apparatus according to claim 1, wherein any one of the heating plates has a fluid introduction type expansion bag.