JP2007144455A - Speed controller for multiple cylinder type press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speed controller for a multiple cylinder type press capable of surely performing the synchronizing and tuning of operating speeds in a plurality of hydraulic cylinders of the same standard, and performing the parallel translation of a press member. <P>SOLUTION: In the speed controller for multiple cylinder type press where a movable hot plate 2 is translated in parallel by a plurality of cylinders 4 to 7 arranged side by side, the respective cylinders 4 to 7 are composed so as to be in both rod forms, further, the pressurized oil feed side and the pressurized oil exhaust side of these cylinders adjoining in the upstream step and downstream step (5A and 4B, 6A and 5B, 7A and 6B) are connected to each other; thus the working speed of the plurality of hydraulic cylinders 4 to 7 is made synchronous, and the movable hot plate 2 can be parallelly translated not only to the pressurizing direction but also to the releasing direction, and also, even if cylinders of the same standard are adopted, the pressure receiving areas on the pressurized oil feed side and the pressurized oil exhaust side between the adjoining cylinders for synchronous operation can easily be equalized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a vulcanizing device for heating and pressing a belt member such as rubber between a frame frame and a movable heat plate, and a plurality of cylinders that simultaneously translate the movable heat plate by a plurality of cylinders arranged in parallel. The present invention relates to a speed adjusting device for a type press.

  Normally, in order to manufacture rubber endless belts, that is, rubber crawlers and belt conveyors, by vulcanization molding, long rectangular unvulcanized products are integrally vulcanized with a flat press and then bonded to both ends. There is a connection vulcanization method to vulcanize, but in the connection vulcanization method, in order to bond and vulcanize the ends, a predetermined bonding margin must be provided, and in order to secure a plus alpha portion of the circumference A long flat press vulcanizer was required, which increased the equipment area and initial capital investment, and also required a vulcanizer for bonding both ends. In addition, since cords such as wires that are reinforcing cores are connected by adhesion of rubber members, the performance of the product is not sufficient.

  Therefore, the feed vulcanization method in which vulcanization is performed every predetermined circumference after installing an unvulcanized rubber belt in which cords such as wires that are reinforcing cores are set in a ring shape from the beginning is highly durable and has a predetermined performance. It is widely adopted as one that can secure What is shown in FIG. 4 is a schematic view of such a feed vulcanizer. The unvulcanized belt member 3 such as a rubber crawler or a belt conveyor is sequentially sent between the upper frame 31A and the movable heating plate 32 in the frame frame 31 and heated and pressed. In such a vulcanizing apparatus, a pressing operation is performed by moving the plurality of, for example, four hydraulic cylinders 34 to 37 along with the movable heating platen 32. However, stable quality is obtained by uniform press vulcanization. For this purpose, the plurality of hydraulic cylinders 34 to 37 need to move the movable heat plate 32 in parallel and simultaneously translate them.

  FIG. 5 shows what is called a countershaft system. In order to translate the movable heating plate 42 arranged in the frame 41 by a plurality of hydraulic cylinders 44 to 47, the forced heating plate 42 installed on the countershaft is forced. Using a synchronous gear. Synchronous gears 49, 49 installed at both ends of the countershaft 50 are meshed with racks 48, 48 suspended from both ends of the movable heat platen 42. With such a configuration, due to the feeding of the racks 48 and 48 that mesh with the synchronous gears 49 and 49 at both ends of the countershaft 50, there is an error in the friction resistance between the hydraulic cylinders 44 to 47 and the oil feed amount from the pump. Even if it occurs, the movable heating platen 42 moves in parallel and a stable pressing operation can be performed. However, this countershaft system is not practical because it requires meshing accuracy between the rack 48 and the synchronous gear 49, and the gear mechanism itself is required to have high strength and is enlarged.

In view of this, the means disclosed in Patent Document 1 below has been proposed as means for synchronizing the movement amounts of a plurality of hydraulic cylinders only by devising the hydraulic circuit without causing enlargement of the apparatus.
Japanese Patent Application Laid-Open No. 7-248005 (see claim 1).

The pressure cylinder tuning device disclosed in Patent Document 1 will be described with reference to FIG. At least two hydraulic cylinders 102 and 103 are provided, and the rod side pressure receiving area of one hydraulic cylinder 102 and the piston side pressure receiving area of the other hydraulic cylinder 103 are set to be the same. That is, π (d1 / 2) ² −π (d2 / 2) ² = π (d3 / 2) ^2, that is, d1 ² −d2 ² = d3 ² (d1 and d3 are cylinder inner diameters and d2 are rod outer diameters). The relationship is established, and the rod side chamber 122 of one hydraulic cylinder 102 is configured to communicate with the piston side chamber 131 of the other hydraulic cylinder 103. With such a configuration, when the rod 102a of the first hydraulic cylinder 102 has a Δs stroke, the rod 103a of the second hydraulic cylinder 103 also has a Δs stroke in the same manner, so that two hydraulic cylinders like the conventional one can be installed. Used to synchronize and eliminate the need for high-precision diverter valves that divide the pressure oil from the hydraulic pump, and even when different loads are applied to each hydraulic cylinder, each cylinder is reliably tuned and expanded and contracted. It was possible to do.

  However, in such a conventional tuning device, in the unlikely event that the oil in each hydraulic cylinder leaks from a part of the piping, the hydraulic hose connecting each hydraulic cylinder causes aging, or the temperature changes Due to disturbances such as expansion and contraction of hydraulic oil due to the above, there is a possibility that the position synchronization of the cylinder may be gradually changed. For this reason, there is a possibility that specific hydraulic cylinders in the plurality cannot perform sufficient expansion and contraction operations. Moreover, since the conventional example is a single cylinder type, it is necessary to set the rod side pressure receiving area of one hydraulic cylinder 102 and the piston side pressure receiving area of the other hydraulic cylinder 103 to be the same. The specifications of the two hydraulic cylinders 102 and 103 were different (cylinder inner diameter d1 ≠ d3).

  Accordingly, the present invention solves the problems of the conventional hydraulic cylinder tuning device and reliably synchronizes the operating speeds of a plurality of hydraulic cylinders of the same standard by simply adopting a hydraulic circuit having a simple structure. An object of the present invention is to provide a speed adjusting device for a multi-cylinder press capable of parallel movement of a press member.

  For this reason, the present invention is a vulcanizing apparatus that heats and presses a belt member between a frame body and a movable hot platen, and a multi-cylinder type in which the movable hot platen is simultaneously translated by a plurality of juxtaposed cylinders. In the press speed adjusting device, each cylinder is formed in a double rod type, and the pressure oil supply side and the pressure oil discharge side of these cylinders adjacent to the upstream stage and the downstream stage are connected to each other. In the present invention, a first on-off valve is provided in each pipe line connecting each pressure oil discharge side and each pressure oil supply side of the cylinders adjacent to the upstream stage and the downstream stage. A branch point branching from the hydraulic pump is connected between the 1 on-off valve and the pressure oil supply side of each cylinder via a second on-off valve, and the pressure oil on each of the first on-off valve and each cylinder is further connected. Each discharge junction to the hydraulic tank or the like is connected to the discharge side via a second on-off valve. Further, the present invention opens one of the first on-off valve and the second on-off valve and closes the other to move to one of the rods and to move them. By reversing the valve operations of the first and second on-off valves in the vicinity of the final point, the moving operation of each cylinder is performed separately. Means for this.

  According to the present invention, there is provided a vulcanizing device for heating and pressing a belt member between a frame body and a movable heating plate, and a plurality of cylinder types in which the movable heating plate is simultaneously translated by a plurality of juxtaposed cylinders. In the press speed adjusting device, each cylinder is configured in a double rod type, and the pressure oil supply side and the pressure oil discharge side of these cylinders adjacent to the upstream stage and the downstream stage are connected to each other, thereby providing a plurality of hydraulic pressures. Synchronizing the operation speed of the cylinders makes it possible not only to move the movable heating plate in the direction of pressurization but also in the mold release direction reliably and quickly. The pressure receiving areas on the pressure oil supply side and the pressure oil discharge side of the cylinders to be made can be easily made equal. In addition, by installing the movable heating plate at the respective end portions of both rods by the double rod type, it becomes possible to vulcanize the two belt members disposed vertically.

  In addition, a first on-off valve is provided in each pipe line connecting each pressure oil discharge side and each pressure oil supply side between the cylinders adjacent to the upstream stage and the downstream stage, and each of these first on-off valves And a branch point branched from the hydraulic pump via a second on-off valve, and further, the first on-off valve and the pressure oil discharge side of each cylinder, Between the discharge junctions to the hydraulic tank or the like via the second on-off valve between the two, the hydraulic pressure with a simple structure in both the pressurizing direction and the releasing direction of the movable heat disc A hydraulic circuit is configured by combining the cylinder and the on-off valve, and each of the hydraulic cylinders can be moved independently of each other in order to eliminate stroke synchronization deviation caused by hydraulic fluid leakage or the like.

  Further, by opening one of the first on-off valve and the second on-off valve and closing the other, the movement to one of the rods is performed, and the vicinity of the final point of the moving operation When the moving operation of each cylinder is performed separately by reversing the valve operations of the first and second on-off valves, the pressurizing direction and the release direction are combined with appropriate control means. In any case of the mold direction, a synchronous operation at a quadruple speed is possible during the operation of the movable hot platen, and the stroke synchronization deviation caused by hydraulic oil leakage or the like is canceled near the final point. That is, since each hydraulic cylinder performs a pressurizing operation, etc., it is possible to prevent the occurrence of cylinders that are out of synchronization and stop in the middle of the pressurizing operation. And a predetermined applied pressure of each hydraulic cylinder can be obtained.

  Embodiments of a speed adjusting device for a multi-cylinder press according to the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a speed adjusting device for a multi-cylinder press according to the present invention. FIG. 2 is a block diagram of a hydraulic circuit constituting the speed adjusting device, and FIG. 2 shows a multi-cylinder press using the speed adjusting device. FIG. 3 is an overall perspective view showing a second embodiment of the speed adjusting device for a multi-cylinder press according to the present invention. As shown in FIG. 1, the basic configuration of the present invention is a vulcanizing apparatus that heats and presses a belt member between a frame frame 1 and a movable heating platen 2, and a plurality of juxtaposed cylinders 4-7. In the multi-cylinder press speed adjustment device that simultaneously moves the movable hot platen 2 at the same time, the cylinders 4 to 7 are formed in a double rod form, and the pressure between these cylinders adjacent to the upstream stage and the downstream stage is set. The oil supply side and the pressure oil discharge side are connected.

  As shown in FIG. 2, the multi-cylinder press device of the present invention includes a plurality of (four in the illustrated example) hydraulic cylinders 4 to 7 arranged at substantially equal intervals in, for example, a rectangular frame 1. Installed. A movable heating platen 2 heated by an appropriate heat source (such as a heating wire or a heating steam pipe) is installed in the upper part of the frame body 1 so as to be movable in parallel up and down. The hydraulic cylinders 4 to 7 are fixed at the bottoms on the lower frame 1B of the frame 1 and the lower rods 4D to 7D on the lower side are correspondingly drilled on the lower frame 1B. It fits in each retraction hole 12. The upper ends of the first rods 4 </ b> C to 7 </ b> C on the upper side of the hydraulic cylinders 4 to 7 are connected to the lower part of the movable heating platen 2. Therefore, the space formed between the upper frame 1A of the frame frame 1 and the movable heating platen 2 constitutes a vulcanization press portion of the vulcanization belt 3 made of synthetic rubber or rubber.

  Returning to FIG. 1, the hydraulic circuit constituting the speed adjusting device of the multi-cylinder press of the present invention will be described. A movable hot platen 2 indicated by a one-dot chain line in the figure is constituted by a plurality of hydraulic cylinders 4, 5, 6, 7 so that each hydraulic cylinder is synchronously translated in a substantially horizontal state in the vertical direction. Each hydraulic cylinder 4, 5, 6, 7 is composed of a double rod type cylinder of the same standard. For example, one hydraulic cylinder 4 is described. Both rods 4D and 4C extend through the first chamber 4A on the pressure oil supply side and the second chamber 4B on the pressure oil discharge side separated by the piston 4P. . The hydraulic pump P and each first chamber 4A, 5A, 6A, 7A of each hydraulic cylinder 4-7 are connected via a switching valve 8 and branch points S1, S2, S3. Supply-side second on-off valves 10A, 10A are interposed between the branch points S2, S3 and the first chambers 5A, 6A. The second chambers 4B, 5B, and 6B and the first chambers 5A, 6A, and 7A in the next stage are connected via the first on-off valve 9.

  Between the first on-off valve 9 and each of the second chambers 4B, 5B, 6B, the second on-off valves 10B, 10B on the discharge side are interposed, and the oil joins at the junctions S4, S5, S6. It is discharged from the discharge side of the switching valve 8 to a tank (not shown). On the 8A side of the switching valve 8, pressure oil is supplied to the first chambers 4 </ b> A, 5 </ b> A, 6 </ b> A, 7 </ b> A of the hydraulic cylinders 4 to 7 to perform a pressurizing operation for moving the movable heating plate 2 upward. An example of the pressurizing operation in FIG. 1 in which the switching valve 8 is on the 8A side will be described. All the second on-off valves 10A and 10B are closed, and all the first on-off valves 9 are opened. The pressure oil discharged from the hydraulic pump P first expands the first chamber 4A of the first hydraulic cylinder 4. As a result, the piston 4P moves upward in the drawing to reduce the second chamber 4B, and the oil pushed thereby expands the first chamber 5A of the second hydraulic cylinder 5 at the next stage via the first on-off valve 9. Let This is repeated sequentially to expand the first chambers 6A, 7A of the third and fourth hydraulic cylinders 6, 7. These four hydraulic cylinders 4, 5, 6, and 7 have the same specifications such as cylinder cross-sectional area and rod diameter. In the above operation in the hydraulic circuit, the speeds of the rods of the four hydraulic cylinders 4, 5, 6, and 7 are theoretically synchronized.

  Theoretically in the hydraulic circuit configuration more than synchronized, due to oil leakage from each cylinder or a part of the piping, aging expansion of the hydraulic hose connecting each cylinder, expansion and contraction of hydraulic oil due to temperature, etc. There is a risk that the stroke synchronization may be disturbed between the cylinders. Also, in this method, all cylinders operate with a fixed amount of oil compared to an independent hydraulic cylinder circuit, so in the case shown in the figure, an operating speed of 4 × speed can be obtained. The force becomes 1/4. When a synchronization shift occurs in the rods of the hydraulic cylinders 4, 5, 6, and 7 in the pressurizing operation, the second stage to the final stage of the pressurizing operation, for example, about 1 mm near the final point of pressurization by the cylinder. At the position where the oil in the chambers 4B, 5B, 6B, and 7B is pushed out, a means for eliminating the synchronization shift is taken.

  The pistons 4P, 5P, 6P, and 7P in the hydraulic cylinders 4, 5, 6, and 7 approach the ceiling of the second chambers 4B, 5B, 6B, and 7B of the cylinders 4, 5, 6, and 7, and the final pressurization is performed. When it becomes about 1 mm near the point, the movable hot plate 2 reaches the final stage of the pressurizing operation. When the stroke sensor 13 detects this, the valve switching control means 14 closes all the first on-off valves 9 and opens all the second on-off valves 10A, 10B. As a result, the hydraulic pressure from the hydraulic pump P passes through the branch points S1, S2, S3 and directly through the supply-side second on-off valve 10A to the first chambers 4A, 5A of the hydraulic cylinders 4, 5, 6, 7 directly. , 6A, 7A. In those cases, the oil pushed out from the second chambers 4B, 5B, 6B, 7B is discharged to the tank via the discharge side second on-off valve 10B and the junctions S4, S5, S6. Thus, a synchronous operation at a quadruple speed is possible in the middle of the operation, and the stroke synchronization deviation due to hydraulic oil leakage or the like is canceled near the final point. That is, since the hydraulic cylinders 4, 5, 6, and 7 perform the pressurizing operation separately, it is possible to prevent a cylinder that is out of synchronization and stops in the middle of the pressurizing operation.

  Next, in order to perform the mold release operation for retracting the movable thermal plate 2 downward, the switching valve 8 is switched to the 8B side so that the junction points S4, S5, S6 become branch points, and the branch points S1, S2, S3. Becomes the confluence. The pressure oil from the pump P is supplied to the second chamber 7B of the fourth hydraulic cylinder 7 to move the piston 7P downward strongly and reliably, and the mold release operation is performed. The oil pushed out from the first chamber 7 </ b> A is supplied to the second chamber 6 </ b> B of the third hydraulic cylinder 6 through the first on-off valve 9. Thereafter, the process is repeated sequentially. When the movable hot platen 2 reaches the vicinity of the final point of the mold release operation, the stroke sensor 13 detects this, and the valve switching control means 14 closes all the first on-off valves 9 and the second on-off valves 10 Since all the hydraulic cylinders 4, 5, 6, and 7 perform the releasing operation separately, it is possible to prevent the cylinders that are out of synchronization and stop in the middle of the releasing operation. That is, the stroke synchronization deviation due to hydraulic fluid leakage or the like is cancelled.

  FIG. 3 is an overall perspective view showing a second embodiment of the speed adjusting device for a multi-cylinder press according to the present invention. The thing of a present Example utilizes a hydraulic cylinder being a double rod type | mold, and arrange | positions the movable heat | fever plate | board 2 to each edge part of both rods, A vulcanization belt member is carried out in two steps up and down. It is configured so that it can be vulcanized under pressure. For example, intermediate portions of a plurality of (four in the illustrated example) hydraulic cylinders 4 to 7 are juxtaposed at substantially equal intervals on a fixed bar 11 provided at approximately the center of the height in the rectangular frame 1. To fix. An upper movable heat platen 2A heated by an appropriate heat source (such as a heating wire or a heating steam pipe) is provided above and below the hydraulic cylinder, and an upper part in the frame frame 1 is provided at a lower part in the frame frame 1. A similar lower movable heating platen 2B is installed so as to be movable in parallel. The upper ends of the first rods 4C to 7C on the upper side in the hydraulic cylinders 4 to 7 are connected to the lower portion of the upper movable heat plate 2A, and the lower ends of the second rods 4D to 7D on the lower side are connected to the lower movable heat plate 2B. Connected to the top. Therefore, the space formed between the upper frame 1A of the frame frame 1 and the upper movable heating platen 2A and between the lower frame 1B and the lower movable heating platen 2B of the frame frame 1 is a vulcanizing belt. 3A and 3B vulcanizing press sections are constructed.

  Thus, when the rods 4C to 7C and 4D to 7D in the hydraulic cylinders 4 to 7 are moved upward, the pressure movable vulcanization operation by the upper movable heat platen 2A is performed and the mold release operation of the lower movable heat platen 2B is performed at the same time. When the rods 4C to 7C and 4D to 7D in the hydraulic cylinders 4 to 7 are moved downward, a pressure vulcanizing operation by the lower movable hot platen 2B is performed, and at the same time, a release operation of the upper movable hot platen 2A is performed. By these operations, the upper vulcanizing belt member 3A and the lower part are respectively provided between the upper frame 1A and the upper movable heating platen 2A in the frame frame 1 and between the lower frame 1B and the lower movable heating platen 2B. Vulcanizing pressure and releasing of the vulcanizing belt member 3B can be performed simultaneously. The structure of the hydraulic cylinders 4 to 7, the hydraulic circuit, and the operation of the hydraulic cylinder are the same as those in FIG.

  The embodiment of the present invention has been described above. However, within the scope of the present invention, the shape of a belt member such as a rubber crawler or a belt conveyor to be vulcanized (arrangement of driving protrusions and grounding lugs, etc.) , Type (arrangement of reinforcing cords, etc.), shape of frame frame (if the length of the frame in the vulcanization feed direction is increased to some extent, hydraulic cylinders can also be installed in multiple rows in the length direction) , Type, shape of movable heat plate (shape corresponding to the form of driving protrusions and grounding lugs on the surface of the belt member can be attached to the surface of the movable heat plate), type (heat line or heating as the heat source) (Embedded steam pipe, etc.) and its connection with the rod in the hydraulic cylinder, the shape, type (double rod type) and number of the hydraulic cylinder, as well as the installation form on the frame and fixed frame, on-off valve, switching valve and branch point Na The shape of the junction, the type, the shape of the hydraulic pump, the type, the shape of the stroke sensor, the type and installation location, the shape and type of the valve switching control means, and the switching mode of the on-off valve by the control means (mechanical, electrical It is possible to select any one of fluid shape), and the shape and type of the pipe line connecting between the hydraulic cylinder and each valve, and their connection form can be selected as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a hydraulic circuit constituting a speed adjusting device according to a first embodiment of a speed adjusting device for a multi-cylinder press according to the present invention. FIG. 2 is a schematic view of a multi-cylinder press using the speed adjusting device. It is a whole perspective view which shows 2nd Example of the speed adjustment apparatus of the multiple cylinder type press of this invention. 1 is a schematic view of a general feed vulcanizing apparatus. It is the schematic of the feed vulcanizer which employ | adopted the countershaft system. It is a hydraulic circuit diagram in the conventional tuning apparatus of a hydraulic cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame frame 2 Movable heating board 3 Vulcanization belt member 4-7 Hydraulic cylinder 4A-7A 1st chamber (pressure oil supply side: At the time of pressure vulcanization)
4B-7B second chamber (pressure oil discharge side: during pressure vulcanization)
4P to 7P piston 8 switching valve 9 first on-off valve 10A second on-off valve (pressure oil supply side: during pressure vulcanization)
10B Second on-off valve (pressure oil discharge side: during pressure vulcanization)
13 Stroke sensor 14 Valve switching control means P Hydraulic pump S1 to S3 Branch point (during pressure vulcanization)
S4 to S6 Junction point (at pressure vulcanization)

Claims (3)

In a vulcanizing apparatus that heats and presses a belt member between a frame and a movable heat plate, and a speed adjusting device for a multi-cylinder press that simultaneously translates the movable heat plate by a plurality of juxtaposed cylinders. The speed adjustment of the multi-cylinder press characterized in that each cylinder is configured in a double rod type and the pressure oil supply side and the pressure oil discharge side of these cylinders adjacent to the upstream stage and the downstream stage are connected to each other. apparatus. A first on-off valve is provided in each pipe line connecting each pressure oil discharge side and each pressure oil supply side between the cylinders adjacent to the upstream stage and the downstream stage, and each of these first on-off valves and Each branch point branched from the hydraulic pump is connected to the pressure oil supply side of the cylinder via a second on-off valve, and further between the first on-off valve and the pressure oil discharge side of each cylinder. The multi-cylinder press speed adjusting device according to claim 1, wherein each discharge confluence to the hydraulic tank or the like is connected via a second on-off valve. By opening either one of the first on-off valve and the second on-off valve and closing the other, the movement to any one of the rods is performed and in the vicinity of the final point of the movement operation. The speed adjustment of the multi-cylinder press according to claim 2, wherein each cylinder is moved separately by reversing the valve operations of the first and second on-off valves. apparatus.

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