JP3460083B2 - Intensifier for bulge forming equipment - Google Patents

Description

Detailed Description of the Invention TECHNICAL FIELD OF THE INVENTION

The present invention relates to a pressure booster for a bulge forming device .

[0002]

2. Description of the Related Art As is well known, a bulge forming device has a high pressure.
In addition to oil tanks, hydraulic pumps, electric motors, control valves, actuators, piping, etc., pressure boosters are the main constituent elements required. The hydraulic pressure in the low-pressure and high-capacity intensifier above supplied from the hydraulic unit, is used, when changing the hydraulic pressure in the high pressure and small capacity, high pressure required at elevated圧先during bulge forming by this booster To get.

A pressure booster used in a water jet ultrahigh pressure water generator will be described as a conventional example with reference to FIG. FIG. 8 is a principle diagram of a hydraulic circuit of a water jet ultra-high pressure water generator to which a conventional pressure booster is applied.
This device is configured so that high-pressure water can be jetted from the tip of the nozzle by driving a predetermined hydraulic system.

That is, on the oil unit side in the illustrated example, the oil from the oil tank is sucked up by the hydraulic motor driven by the electric motor and guided into the pressure booster 38 by the directional control valve 39 through a predetermined pipeline. This booster 38
The hydraulic piston drives the plunger in the high-pressure water cylinder to the left and right, and the water from the water supply unit side is calculated according to the ratio of the piston area to the plunger cross-sectional area (pressure increase ratio). ) Is applied to generate high pressure water. In this way, the high-pressure water generated by the pressure booster 38 in a double-acting manner is discharged at high pressure from the tip of the nozzle 43 after removing the pulsation through the accumulator 41. 40
Is a check valve for preventing backflow, and 44 is a detector for detecting the cylinder position.

[0005]

By the way, the conventional pressure booster used in the above water jet ultrahigh pressure water generator has a structure capable of continuous discharge, but is provided with a check valve 40 for preventing backflow. Therefore, the pressurizing medium cannot be returned to the pressure booster 38 side from the pressurizing destination, so that there is a problem that the pressure increases above the predetermined pressure at the pressurizing destination.

Further, conventional pressure boosters other than the above pressure boosters are usually single-acting and composed of a single cylinder. In this case, in order to increase the discharge amount, the capacity of the pressure booster is increased. When the capacity of the booster is increased, the cylinder itself naturally has a large capacity, which increases the weight of the entire booster and raises the manufacturing cost.

The present invention has been made in order to solve the problems of the above-mentioned conventional pressure booster, and its purpose is to reduce the pressure at the pressurizing destination as necessary or to maintain it at a constant pressure. It is an object of the present invention to provide a pressure booster for a bulge forming apparatus, which is provided with means for returning the pressure medium from the pressurization destination to the pressure booster side or the tank side.

[0008]

Then, the bulge of claim 1
The intensifier of the molding equipment is equipped with a double-acting cylinder,
A pressure intensifier of double-acting type bulge forming apparatus a pressurized medium made pressure increasing the pressure can be continuously pressurized, the pipe opening and closing valve to be connected to <br/> each port of intensifier above and disposed, by opening and closing switching operation of the on-off valve, return the pressurized medium from the pressurized圧先
It is characterized in that a pressure reducing flow path is secured so that the pressure at the pressurizing destination can be reduced or maintained at a predetermined pressure.

In the case of a single-acting type pressure booster composed of a single-acting cylinder, in order to increase the discharge amount of the pressurized medium,
There was no choice but to increase the capacity of the booster itself. Therefore, the cylinder is large and heavy, and the cost is high. Further, even in a double-acting type pressure booster configured with a double-acting cylinder, since a check valve for preventing backflow is provided, the pressurizing medium cannot be returned from the pressurizing destination to the booster side, Therefore, it is unavoidable that the pressure rises above a predetermined pressure at the pressurization destination.

Therefore, in the pressure booster of the bulge forming apparatus according to claim 1, a means for returning the pressurizing medium from the pressurization destination to the pressure booster side is added to the double-acting type pressure booster. Thus, it was possible to maintain the pressure at the pressurizing destination at a predetermined pressure as needed. In other words, an on-off valve is provided in each of the pipelines connected to each port of the pressure booster, and the pressure-reducing flow path is secured by the opening / closing operation of these on-off valves. Alternatively, it is easy to keep the pressure constant. Incidentally, the opening and closing switching operation at all times the pressure of the pressurized圧先the on-off valve, is detected, and those that are automatically controlled to allow the switching of the appropriate valve when the detected pressure exceeds a constant pressure, this The automatic control for switching the on-off valve is not limited to the invention of claim 1, and is applied to all of the invention.

In addition, the bulge forming apparatus according to the first aspect of the present invention is increased.
In the pressure device, one of the cylinders that make up the double-acting type cylinder is constantly increasing in pressure, and the intended purpose (pressure at the pressurizing destination) is simply by switching the open / close of the on-off valve at the stroke end of the piston. The step-down or constant if necessary
The purpose of keeping pressure) can be achieved, the controllability is good, and complicated control is unnecessary. Also, the switching of the on-off valve can be performed by switching between two patterns (open / closed) at the time of switching the piston moving direction according to the moving direction of the piston, which not only simplifies the operation but also the automatic switching of the on-off valve described above. It is easier to control the operation. Furthermore, by adopting a double-acting type in which two cylinders are combined, the low-pressure cylinder portion is integrated into one, and it is possible to achieve a significant compactification and simplification of the mechanism.

According to a second aspect of the present invention, there is provided a booster for a bulge forming apparatus, which comprises a double-acting cylinder or a plurality of single-acting cylinders.
The pressure medium pressure can be increased and the pressure medium can be continuously pressurized.
A <br/> intensifier double-acting type or single-acting coupling type bulge forming device, respectively in correspondence with the check valve disposed in the conduit to be connected to each port of intensifier above, the opening and closing combined by adding the valve, by opening and closing switching operation of the on-off valve, pressurizing the pressure medium to ensure buck passage for returning the pressurized圧先, so that the pressure of a pressurized圧先can be kept to a step-down or a predetermined pressure It is characterized by having done.

In the pressure booster of the bulge molding apparatus according to the second aspect, when it is not necessary to perform the switching operation of the open / close valve (when it is not necessary to return the pressurizing medium from the pressurizing destination), Each check valve can be used as it is for backflow prevention without operating the on-off valve. Especially for double-acting type, pressurization
Operate the on-off valve when it is not necessary to return the pressurized medium from the beginning.
Therefore, the number of times the on-off valve operates can be significantly reduced, and the life of the on-off valve can be improved. Further, for the same reason as the invention of claim 1, the control of the cylinder operation and the operation control of the on-off valve are greatly simplified. Further, in the case of the single-acting type in which two single-acting cylinders are symmetrically provided, only when returning the pressurized medium from the pressurizing destination,
It suffices to operate the open / close valve, and the number of operations of the open / close valve, which is generally low in durability, can be greatly reduced, and the durability of the open / close valve can be improved.

Further, the pressure booster of the bulge forming apparatus according to claim 3 comprises a double-acting cylinder or a plurality of single-acting cylinders,
The pressure medium pressure can be increased and the pressure medium can be continuously pressurized.
A <br/> intensifier double-acting type or single-acting coupling type bulge forming apparatus, the opening and closing valve provided in the conduit located on the high pressure side of the intensifier above, pressure open-off valve the pressurized medium from above by leakage to the tank side, characterized in that to be able to keep the buck or a predetermined pressure the pressure in the pressurized圧先.

In the pressure booster of the bulge molding apparatus according to the third aspect, when the pressure of the pressurizing destination is reduced as necessary, the opening / closing valve is opened to apply the pressure from the pressurizing destination. The medium can be leaked to the tank side to easily reduce the pressure. Moreover, since the on-off valve operates only when the pressure is reduced and this on-off valve is not frequently used, there is an advantage that the valve life can be extended. Further, since only one on-off valve is required and the structure can be simplified, it can be easily applied to an existing bulge forming device with a few modifications and is effective.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific embodiments of the booster of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit configuration diagram of a main part of a booster according to an embodiment of the present invention, which is an example of application to a double-acting type in particular. FIG. 2 is a circuit configuration diagram which is a main part (combination of a check valve and an on-off valve) of a pressure booster according to another embodiment of the present invention, and (a) is an application example to a double-acting type. (B) shows an example of application to a single-acting connection type. FIG. 3 is a circuit configuration diagram showing a main part (combination of an on-off valve and a leak orifice) of a pressure booster according to another embodiment of the present invention. FIG. 3 (a) is an application example to a double-acting type. And (b) shows an example of application to a single-acting connection type. 4 is an operation diagram of the booster of FIG.
(A) shows an operation diagram at the time of boosting, and (b) shows an operation diagram at the time of dropping the voltage. 5A and 5B are operation diagrams of the booster shown in FIG. 2, where FIG. 5A shows an operation diagram at the time of boosting and FIG. 5B shows an operation diagram at the time of reducing the voltage. FIG. 6 shows an embodiment in which the booster shown in FIG. 2 is modified, and (a) shows an operation diagram at the time of boosting,
(B) shows an operation diagram at the time of step-down. Furthermore, FIG.
It is an operation | movement figure of the pressure booster shown to (a), (a) shows the operation | movement figure at the time of pressure | voltage rise, (b) shows the operation | movement figure at the time of pressure | voltage fall.

First, a booster according to an embodiment of the present invention will be described with reference to FIG. This booster 1
Then, the on-off valves 6, 7, 8, 9 (four in total) are provided in the pipelines 2, 3, 4, 5 connected to the respective ports on the left and right of the booster 1. That is, an opening / closing valve 6 is provided for the pipeline 2, an opening / closing valve 7 is provided for the pipeline 3, an opening / closing valve 6 is provided for the pipeline 2, and an opening / closing valve 7 is provided for the pipeline 3. And

The operation of the pressure booster configured as described above will be described with reference to FIGS. 4 (a) and 4 (b). First, when raising the pressure, as shown in FIG. 4 (a), both the on-off valve 6 on the side of the pipeline 2 and the on-off valve 9 on the side of the pipeline 5 are opened to leave the pipelines 2 and 5 in the open state. While securing the flow path f of the high-pressure pressurized medium, the other on-off valves 7 and 8 are closed to close the flow paths by closing the conduits 3 and 4. By selecting the opening / closing switching operation of the on-off valves 6 to 9 in this manner, the pressurized medium (for example, high-pressure water) increased in pressure by the pressure intensifier 1 is passed to the pressurization destination via the flow path f. Sent. Then, the obtained high pressure is used as a pressure source of a pressure destination (pressure source at the time of bulge molding ).

On the other hand, in the case of reducing the pressure, as shown in FIG. 4 (b), the open / close valves 6 and 9 are opened and the open / close valves 7 and 8 are closed to secure the flow path indicated by the dotted line g, The pressurizing medium (high-pressure water in the illustrated example) at the pressurization destination is returned along the flow path g, and the pressure can be reduced.

Next, a circuit configuration which is a main part (a combination of a check valve and an on-off valve) of a pressure booster according to another embodiment of the present invention will be described with reference to FIG. First, (a) of FIG. 2 is an application example in the case of a double-acting type, and as shown in the figure, the pipe lines 2 to 5 connected to the respective ports on the left and right of the booster 1 are connected to the pipe lines 2 to 5. Corresponding to the arranged check valves 10 to 13, on-off valves 14 to 17 (total of 4 pieces) were provided in parallel so as to bypass the check valves 10 to 13, respectively. On the other hand, (b) of FIG. 2 is an example of application to the case of a single-acting connection type, and as shown in the figure, in the booster in this case, the single-acting cylinder 18 and the single-acting cylinder 19 are left and right. The respective ports of these cylinders 18 and 19 are connected to each other by pipe lines while being arranged so that
Check valves 24, 25, 26, 2 for 21, 22, 23
7 are provided. In such a booster, corresponding to the check valves 24, 25, 26 and 27,
On-off valves 28, 29, 30 and 31 are provided in parallel so as to bypass the check valves 24, 25, 26 and 27.

Here, an operation example of the booster shown in FIGS. 2A and 2B will be briefly described with reference to FIG. First, at the time of pressurization, as shown in FIG. 5 (a), all the on-off valves 14, 15, 16 and 17 are closed, and the pressurized medium is passed through the flow path (shown by the dotted line h) including the check valves 10 and 13. To flow. As a result, the pressurizing medium (high pressure water in the illustrated example) whose pressure has been increased by the pressure intensifier 1 is sent to the pressurization destination. On the other hand, when the pressure is reduced, as shown in FIG. 5B, the on-off valves 14 and 17 are opened and the on-off valves 15 and 16 are closed, so that the pressurizing medium to be pressurized includes the on-off valves 14 and 17. It is returned via the flow path (indicated by the dotted line i).

Next, a modified embodiment of the booster shown in FIG. 2 will be described with reference to FIG. FIG. 3A is an operation diagram at the time of boosting, and in the booster shown in FIG.
A circuit configuration is provided in which the on-off valves 14, 15, 16, 17 are provided in the pipelines arranged outside 0, 11, 12, and 13, respectively. It is possible to increase the pressure of low-pressure water (in the case of the example) via the valve and supply it as high-pressure water (in the case of the example) to the pressurizing destination. On the other hand, FIG. 7B is an operation diagram at the time of pressure reduction, in which case the on-off valves 15 and 16 are closed and the on-off valves 14 and 17 are opened to pressurize high pressure water (in the case of the example).
Operates to return via the on-off valves 14 and 17.

Further, a circuit configuration of a main part (combination of an on-off valve and a leak orifice) of a pressure booster according to another embodiment of the present invention will be described with reference to FIG. First, an example of application to the double-acting type will be described with reference to FIG. As shown in the figure, a check valve 32 disposed in each pipeline connected to each port of the booster 1,
In addition to 33, 34 and 35, a leaking orifice 37 to the tank side is provided in a pipeline branched from the pressurizing side pipeline, and an opening / closing valve 36 is provided in front of this orifice 37.
On the other hand, FIG. 7B shows an application example to the single-acting connection type, in which the single-acting cylinders 18 and 19 are symmetrically positioned.
In addition to the check valves 24 to 27 arranged in the conduit that connects the tank and the check valve 24 to 27, a leak orifice 37 to the tank side is provided in a conduit branched from the pressurizing destination side. An on-off valve 36 was provided on the front side. The leak orifice 37 is not always necessary, but when the leak orifice 37 is provided, if it is a double-acting type,
Regardless of being a single-acting type, it is desirable to select an appropriate diameter in consideration of the step-down speed and the like.

The above-mentioned pressure booster shown in FIG. 3 is substantially the same in both the double-acting type and the single-acting type, so that the operation of both is substantially the same. The operation of the double-acting pipe will be described, and the description thereof will be omitted for the case of the single-acting connection type. That is, at the time of pressurization, as shown in FIG. 7A, the opening / closing valve 36 is closed to allow the pressurized medium to flow in the flow path according to the check valve. on the other hand,
At the time of pressure reduction, as shown in FIG. 7B, the on-off valve 36 is opened to open the pipe line so that the pressurized medium leaks from the orifice 37. In this way, by leaking the pressurized medium from the high pressure side to the tank side, the pressure can be easily reduced. The orifice 37 for leaking the pressurized medium
Although it is necessary to set the diameter of the valve to an appropriate size, the leakage amount can be adjusted depending on the diameter dimension, and therefore the pressure reduction rate can be controlled by selecting the diameter dimension.

The above has been a description of an embodiment of the present invention, the present invention shall in the <br/> stomach limited to the above embodiment.

[0026]

As described above, the bulge forming apparatus according to claim 1 is as described above.
According to intensifier, to pressure intensifier double-acting type, by adding a means for returning to the booster side pressure medium from the pressure圧先, the pressure of a pressurized optionally圧先Achieved to reduce the pressure or keep it at a predetermined pressure. That is, since the on-off valve is arranged in the pipeline connected to each port of the pressure booster and the pressure-reducing flow path can be secured by the switching operation of the on-off valve, the pressure at the pressurization destination is reduced or predetermined. It can be easily maintained at the pressure. In addition, one of the cylinders that make up the double-acting cylinder is constantly increasing in pressure, and simply switching the switching direction of the on-off valve at the stroke end of the cylinder has the intended purpose (decreasing the pressure at the pressurizing destination or reducing it to a predetermined value). Keep on the pressure of
Since the purpose) can be achieved, complicated control is unnecessary. Also, the switching of the open / close valve should be adjusted according to the moving direction of the piston.
It suffices to carry out the pattern when switching the piston movement direction, which is a simple operation. Therefore, it becomes easy to control the automatic switching operation of the on-off valve. In addition, the low-pressure cylinder section is reduced to 1 by using a double-acting type that combines two cylinders.
As a result, it is possible to greatly reduce the size and simplify the mechanism.

Further, according to the pressure booster of the bulge molding apparatus of claim 2, the opening / closing valve is opened when the opening / closing switching operation of the opening / closing valve is not necessary (when it is not necessary to return the pressurized medium from the pressurizing destination). Each check valve can be used as it is to prevent backflow without operating it. Especially in the case of double acting type,
If there is no need to return the pressurized medium from the
Since it does not exist, the number of operations of the on-off valve can be significantly reduced, and the life of the on-off valve can be improved. Further, for the same reason as the invention of claim 1, the control of the cylinder operation and the operation control of the on-off valve are greatly simplified. Furthermore, in the case of the single-acting type, it is sufficient to operate the open / close valve only when returning the pressurizing medium from the pressurization destination, which can greatly reduce the number of times of operation of the open / close valve, which is generally low in durability. The durability of this on-off valve can be improved.

According to the pressure intensifier of the bulge forming apparatus of the third aspect, when the pressure is reduced as necessary, the pressurizing medium from the pressurizing destination is leaked to the tank side by opening the switch by opening / closing the opening / closing valve. By doing so, the pressure can be easily lowered. Further, since the on-off valve operates only when the pressure is reduced, there is an advantage that the frequency of use of this valve is reduced and the valve life can be extended. Further, since only one on-off valve is required and the structure can be simplified, the existing bulge forming apparatus can be put into practical use immediately with few modifications and the equipment cost can be kept low.

[Brief description of drawings]

FIG. 1 is a bulge forming apparatus according to an embodiment of the present invention.
A circuit diagram is intensifier of the main part, in particular example of application to a double-acting type.

FIG. 2 is a bulge forming device according to another embodiment of the present invention.
It is a circuit block diagram which is a main part (combination of a check valve and an on-off valve) of a pressure booster of a fixed type, (a) shows an application example to a double-acting type, (b) shows a single-acting type Application example to

FIG. 3 is a bulge forming device according to another embodiment of the present invention.
A circuit diagram of a main part of the intensifier location (combination of on-off valve and a leak orifice), (a) shows an application example to double-acting type, (b) is linked single acting An example of application to types is shown.

4A and 4B are operation diagrams of the booster shown in FIG. 1, in which FIG. 4A shows an operation diagram at the time of boosting, and FIG. 4B shows an operation diagram at the time of dropping the voltage.

5A and 5B are operation diagrams of the booster shown in FIG. 2, in which FIG. 5A shows an operation diagram at the time of boosting, and FIG. 5B shows an operation diagram at the time of dropping the voltage.

6 shows an embodiment in which the booster shown in FIG. 2 is modified, (a) shows an operation diagram at the time of boosting, and (b) shows an operation diagram at the time of dropping.

FIG. 7 is an operation diagram of the booster shown in FIG.
(A) shows an operation diagram at the time of boosting, and (b) shows an operation diagram at the time of dropping the voltage.

FIG. 8 is a principle diagram of an oil hydraulic circuit of a water jet ultrahigh pressure water generator to which a conventional pressure booster is applied.

[Explanation of symbols]

1 Booster 2, 3, 4, 5 pipeline 6, 7, 8, 9 open / close valve 10, 11, 12, 13 Check valve 18, 19 Single acting cylinder 36 open / close valve 37 Leak Orifice

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Anyu 15-15 Minami Futami, Futami-cho, Akashi-shi -1 Kawasaki Yuko Co., Ltd. (56) References: 57-131266 (JP, U) Actual: 61 -9602 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F15B 3/00 B21D 26/02 F15B 11/028

Claims (3)

(57) [Claims] 1. A double-acting cylinder is provided to increase low-pressure medium pressure.
Of double-acting type that can press and continuously pressurize medium
A intensifier bulge forming apparatus, by disposing the opening and closing valves to each duct to be connected to each port of intensifier above, by opening and closing switching operation of the on-off valve, return the pressurized medium from the pressurized圧先 buck A bulge structure characterized by ensuring a flow path so that the pressure at the pressurization destination can be reduced or maintained at a predetermined pressure.
Intensifier of shaped device . 2. A double-acting cylinder or a plurality of single-acting cylinders.
It is possible to increase the pressure of low pressure medium and to continuously pressurize medium.
Bulge of double-acting type or single-acting type that can be pressurized
A pressure intensifier of the molding apparatus, respectively in correspondence with the check valve disposed in the conduit to be connected to each port of intensifier above, combined by adding the on-off valve, by opening and closing switching operation of the on-off valve, A bulge forming apparatus characterized in that a pressure reducing flow path for returning a pressure medium from a pressure destination is secured so that the pressure at the pressure destination can be reduced or maintained at a predetermined pressure.
Intensifier. 3. A double-acting cylinder or a plurality of single-acting cylinders.
It is possible to increase the pressure of low pressure medium and to continuously pressurize medium.
Bulge of double-acting type or single-acting type that can be pressurized
A pressure booster for a molding machine, in which an on-off valve is provided in the pipeline located on the high pressure side of the pressure booster , and this on- off valve is opened to apply pressure
The pressurizing medium al by leakage to the tank side, intensifier bulge forming apparatus according to claim that it has to be able to keep the buck or a predetermined pressure the pressure in the pressurized圧先.