JP2000199501A - Cylinder device with pressure intensifying mechanism operating according to increase in pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate at a high pressure according to an increase in external pressure during operation by low pressure fluid. SOLUTION: A part of a rod passage 12 is closed, and a passage 11 is closed during operation, and a cylinder 2, which is fitted with a piston 1a, which is integrated with a piston rod 14 having a pressure receiving area section 13 for initial operation, has first and second chambers 7 and 8, and a pipeline 5 for operation is communicated to a third chamber 10, which passes through the first chamber 7, passage 11 and rod passage 12 and is communicated to an external load. The second chamber 8 is kept charged with air, and when the supplied oil pressure is a given value or less, a cylinder device is operated at the supplied oil pressure, and when the supplied oil pressure is a given value or more, the cylinder device is operated at a high pressure caused by the projection of the piston rod 14 to the third chamber 10. By incorporating this device, a low pressure hydraulic equipment becomes a high pressure hydraulic equipment which outputs high pressure in a short time when required with ease at low cost. In addition, this device can perform independently with plural required number of passages branched from an operation pipeline and attaching this device to each of them respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a system in which, when the supplied fluid is, for example, oil, it uses low-pressure supplied oil to work when the load is small, and automatically when the load becomes large. A cylinder device that converts and supplies high-pressure oil to work. By incorporating this device into an existing or new low-pressure hydraulic pump facility, it can be used as a high-pressure hydraulic pump facility. Next, when the supply fluid is, for example, air and the working liquid is oil, by using the gas-liquid conversion tank, it is possible to automatically generate a high pressure when the load is small and a low pressure when the load is large. Can be used as a hydraulic cylinder, empty.

In the first, second and third aspects, there is no valve mechanism, and the return of the valve mechanism of the fourth aspect does not require the supply fluid of the switching valve for the cylinder, and can be performed independently. When using encapsulated gas pressure, the device can be used alone. For example, by branching the required number from one main pipe that supplies low-pressure oil and incorporating this device that can output the high pressure required by each branch pipe, each has a small load alone. In some cases, the operation can be performed by automatically supplying a low-pressure oil and then automatically supplying a high-pressure oil when the load becomes large at any given time.

[0003]

2. Description of the Related Art In a conventional cylinder device having a pressure increasing mechanism, a required position is detected by a limit switch of a work (for example, a hydraulic cylinder or the like), an optical sensor or the like, and the position is fixed by a combination of solenoid valves or by a timer. The solenoid valve is operated every time to switch from the low-pressure liquid to the high-pressure liquid to supply the low-pressure liquid and the high-pressure liquid. In the case where the above-mentioned sensor or the like is not used, the structure is such that the low-pressure liquid is switched to the high-pressure liquid at a predetermined position in the final step in the operation using the low-pressure liquid.

As described above, in order to install and use a conventional cylinder device having a pressure increasing mechanism, a limit switch, an optical sensor, a timer, and the like are combined with a solenoid valve. Electrical equipment including instrumentation equipment was required, and equipment costs for such equipment and time for performing equipment work were required. When the position where the high-pressure liquid is required is arbitrarily changed, it is difficult to cope with the above-mentioned sensor. Next, remodeling from the existing low-pressure hydraulic pump equipment to a high-pressure hydraulic pump equipment required a large amount of equipment cost, and required time to perform the equipment work.

[0005] For example, a branch (for example, 10 places) is branched from a main pipe to which low-pressure oil is supplied, and when each load is small, low-pressure oil is required. When high pressure oil is required. Conventionally, as described in "0003", the work must be performed by detecting the position of the work and operating the pressure-intensifying cylinder based on the combination of the sensor and the solenoid valve. This required electrical equipment including instrumentation,
And the cost for such equipment and the time for performing the work were needed.

[0006]

According to the present invention, a low-pressure supply liquid can be supplied when the load is small, and a high-pressure liquid can be supplied at any time when the load is large and a high-pressure liquid is required.
That is, switching from the low-pressure liquid to the high-pressure liquid does not require a limit switch, an optical sensor, a timer, a solenoid valve, and the like.Electrical equipment including the associated instrumentation equipment is unnecessary. The above problem is solved because it can be easily installed and the equipment cost is low, and it can be automatically done at any time when a switch from low pressure liquid to high pressure liquid is required. In addition, by incorporating the apparatus of the present invention into existing low-pressure hydraulic pump equipment, high-pressure hydraulic equipment can be easily, inexpensively and in a short time, and high-pressure oil can be supplied when necessary.

Next, when the present apparatus is attached to each branch pipe branched from the main pipe, as described in "0002", when the load is small, low-pressure supply oil is supplied, and at each arbitrary time. When the load becomes large, high pressure oil can be supplied automatically and work can be performed.
No electrical equipment including instrumentation is required, and since there is no electrical equipment, it can be easily installed in a short time, and the equipment cost is low.

[0008]

First, the supply fluid will be described as oil, and the gas to be enclosed will be described as air, which will be described below. According to the present invention, there is provided a cylinder having a piston fitted therein, a cover block, a first chamber and a second chamber formed by the piston and the partition block, and the first chamber communicates with the operating pipe. The second chamber is constantly pressurized by pressurized air, and the third chamber formed by the partition block and the liquid chamber block has a rod communicating with a passage communicating with the operating pipe. Communicating with the second chamber through the use passage. Before the operation of the device, the piston rod integrated with the piston closes the rod passage connecting the second chamber and the third chamber in a state where the passage communicating with the operating pipe is opened. . Next, at the time of operation, the piston rod closes the rod passage that communicates with the operation pipe, and projects into the third chamber. The air pressure in the second chamber is determined so that the piston operates when the pressure in the operating pipe line becomes equal to or higher than a predetermined pressure.

According to a second aspect of the present invention, the piston is initially operated by an oil pressure supplied from an operating pipe line and by pressurizing a pressure receiving area smaller than a pressure receiving area of the piston fitted to the cylinder. Later, pressure is applied at the pressure receiving area of the piston.

A third aspect of the present invention provides a piston rod integrated with a cover block and a piston described in “0008”.
The purpose is to attract by the magnet block. As a mounting method, the magnet block is integrated with the cover block or the piston or the piston rod, and is attracted to the other party of the attracting. When the pressure obtained by multiplying the pressure of the operating pipe by the pressure receiving area of the piston fitted to the cylinder is smaller than the attraction force of the magnet block, the third chamber is pressurized by the supply oil of the operating pipe.
When the above-mentioned force is larger than the attraction force of the magnet block, the piston rod described in “0008” projects into the third chamber and pressurizes.

According to a fourth aspect, in the structure described in "0008", the following valve mechanism is provided. The operation pipes communicate with the first chamber through two routes through valve bodies that operate differently. One closes the communication between the working line and the first chamber by a force of a spring or an enclosed air pressure or a combination thereof, and the pressure of the working line rises above a predetermined pressure. Then, it has a valve body that operates and opens against the aforementioned force. The other is a valve having a valve body which closes the communication between the first chamber and the operating pipe by the pressure of the operating pipe or the force of a spring, and opens by the pressure of the first chamber. Mechanism.

A fifth aspect of the present invention is directed to the first, second, third, and fourth aspects, wherein the return operation of the piston and the piston rod by the pressure of the second chamber is performed by the force of the spring.

[0013]

According to the first, second, third, fourth and fifth aspects, it is assumed that necessary portions are filled with oil and air is sealed. In the first aspect, oil is supplied from an operating pipe line.
At this time, since the piston fitted to the cylinder is pressurized by the air sealed in the second chamber, it does not operate when the supplied oil pressure is lower than a predetermined pressure. No oil inflow. However, oil flows into the third chamber, and the supplied oil is directly supplied to an external load. Next, when the load increases, the oil pressure increases with the load. When the pressure exceeds a predetermined pressure, the oil pressure in the second chamber and the oil pressure in the third chamber are reduced. In opposition, the piston and the piston rod operate, and oil flows into the first chamber and the piston and the piston rod move. Working conduit and third
The passage communicating with the chamber is closed, and the piston rod projects into the third chamber. Since the third chamber is in a sealed state including the load, a high pressure based on the principle of Pascal is generated in the third chamber,
Can work outside. Next, when the pressure of the operating pipe is set to the atmospheric pressure, the piston and the piston rod move due to the air pressure of the second chamber, and return to the original position before the operation. The passage is in communication, and the oil in communication with the load and the oil in the third chamber flow out to the operating pipe.

According to the second aspect of the present invention, since the pressure receiving area at the time of the initial operation is smaller than the pressure receiving area of the piston fitted to the cylinder, it operates against the air pressure sealed in the second chamber. In this case, the oil pressure must be increased, whereby the set pressure for operating the piston can be increased. Next, when the initial operation is completed, the piston is pressurized by the oil flowing into the first chamber. As described in “0013”, when the load is small, the work can be performed to the outside by the supply oil, and when the load is large, the work can be performed by the oil at high pressure. Next, to reduce the pressure receiving area for the initial operation, the air pressure in the second chamber is negative with respect to the oil pressure in the first chamber. Is desirable, but when the pressure in the second chamber is low,
The piston operates when the oil pressure in the first chamber is low,
If a high operating pressure of the piston is required, the air pressure in the second chamber must be increased. Thus, by reducing the pressure receiving area at the time of the initial operation, the supply oil pressure can be increased without increasing the air pressure of the second chamber, and the piston is operated by changing the pressure receiving area of the initial operation. Oil pressure can be set.

According to a third aspect of the present invention, the magnet block comprises:
An object of the present invention is to increase the operating pressure of a piston by adsorbing a cover block and a piston or a piston rod.

According to a fourth aspect of the present invention, when the oil pressure in the passage communicating with the operating pipe is low, the oil pressure is equal to or lower than a predetermined pressure. Therefore, the valve mechanism is used for both routes connecting the operating pipe and the first chamber. , The oil does not flow into the first chamber. Next, when the oil pressure in the passage becomes equal to or higher than the predetermined pressure, the valve body of one of the routes operates against the force of the spring or the enclosed air pressure, the valve mechanism is opened, and the oil flows into the first chamber. The piston that flows in and fits into the cylinder operates. As described in “0013”, when the load is small, the work can be performed outside depending on the supply oil, and when the load is large, the work can be performed outside using the high-pressure oil. Next, when the operating pipeline is set to atmospheric pressure, the valve mechanism which has been opened due to the increase in pressure is closed, and the piston and the piston rod move according to the pressure in the second chamber. Is pushed to create pressure, and the valve mechanism, which was previously closed, is opened, and the oil in the first chamber flows out to the working line. Then, the piston and the piston rod return to the original state, and the oil communicating with the load and the oil in the third chamber flow out to the operating pipe.

According to a fifth aspect of the present invention, the piston fitted to the cylinder is operated to return by the force of the spring. This is effective for a small cylinder having a small cylinder diameter and a small piston strobe.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings as an oil supply fluid. FIG. 1 shows an example of the apparatus according to the present invention. In FIG. 1, the operating line 5 and the line 17 communicate with a switching valve 18 for a cylinder.
When oil is supplied to the operation pipe 5, the pipe 17 is used.
Is at atmospheric pressure, and when oil is supplied to the pipeline 17, the operating pipeline 5 is at atmospheric pressure.

A cover block 3, a cylinder 2, a partition block 4, and a piston 1 fitted to the cylinder 2.
, The first chamber 7 and the second chamber 8 are formed, and then the partition block 4 and the liquid chamber block 9 form the third chamber 10.
The first chamber 7 communicates with the operating pipe 5 through the passage 6, the second chamber 8 communicates with the third chamber 10 through the rod passage 12, and the third chamber 10 communicates with the external load through the passage 16. The rod passage 12 is in communication with the passage 11 of the operating pipe 5. The piston rod 14 is integrated with the piston 1 and is fitted into the rod passage 12 with the passage 11 open before the operation, and the second chamber 8 and the third chamber 1
0 is shut off, then air with pressure is sealed in the second chamber 8, and the second pressure is applied to the second chamber 8 so that the piston 1 does not operate when the oil pressure in the first chamber 7 is lower than a predetermined pressure. The air pressure in the chamber 8 is reduced. The above is the state before the operation of the apparatus in FIG. 1 is performed.

The operation of the apparatus shown in FIG. 1 will be described. The oil is supplied to the operation pipe 5. When the supplied oil is lower than a predetermined pressure, the piston 1 depends on the air pressure in the second chamber 8. The piston 1 does not operate because the oil does not flow into the first chamber 7 because it does not operate. 3rd room 1
At 0, oil is supplied through a passage 11 and a rod passage 12, and is supplied to an external load through a passage 16. The oil pressure at this time is determined by the pressure of the air filled in the second chamber 8. This is a state where oil is supplied at a low pressure.

Next, when the oil pressure rises with the increase of the load and exceeds a predetermined pressure, the piston 1 operates against the air pressure of the second chamber 8 and the oil pressure of the third chamber 10 to operate. The oil in the pipeline 5 flows into the first chamber 7 through the passage 6 to move the piston 1. The piston rod 14 also moves to close the passage 11, and further projects into the third chamber 10. 3rd room 1
0 is sealed between the load and the oil pressure supplied to the first chamber 7, the pressure receiving area of the piston 1, and the pressure area of the piston rod 14. Generated in the third chamber 10 and supplied to the load. This is a state in which oil is supplied at a high pressure.

Next, the return of the apparatus of FIG. 1 will be described.
The cylinder switching valve 18 is switched to supply the oil to the pipe 17, and the load is returned to the hydraulic cylinder as a hydraulic cylinder and supplied to the operation side.
The third chamber 10 communicates with a load through a passage 16. Second room 8
Is pressurized with air, the piston 1 moves and the oil in the first chamber 7 flows out through the passage 6 and the working pipe 5, and the piston 1 and the piston rod 14 return to their original positions. Then, the passage 11 is opened, and the oil communicating with the third chamber 10 and the load flows into the rod passage 12 and the passage 11.
Then, it flows out through the operating pipe line 5 and the switching valve 18 for the cylinder.

FIG. 2 shows an example of the apparatus according to the present invention. A pressure receiving area 13 for initial operation is provided between the piston 1a and the cover block 3a, and sealing is performed by press-fitting according to the air pressure in the second chamber 8. During operation, the pressure receiving area 13 is pressurized by the pressurization of the first chamber 7 to perform an initial operation, and then pressurized by the pressure receiving area of the piston 1a to move the piston rod 14 to project into the third chamber 10.

FIG. 3 shows an example of the apparatus according to the third aspect of the present invention, in which a magnet block 30 is fixed to a cover block 3b. The piston 1 that has returned due to the air pressure in the second chamber 8 is attracted to the cover block 3b by the magnet block 30. And the first room 7
Increase the oil operating pressure.

FIG. 4 shows an example of the present invention according to claim 4, wherein two routes, each having a valve mechanism, are connected to the cover pipe 3c of FIG. Is provided. One is that the passage 20 communicating with the operating pipe line 5 is firstly connected to the valve chamber 21 and the passage 22 through the valve body 27.
The valve body 27 which communicates with the chamber 7 has a piston portion fitted in the valve piston chamber 25, and pressurizes the valve body 27 by filling air with pressure into the valve piston chamber 25, and pressurizes the valve body 27.
The communication between the valve 20 and the valve chamber 21 is closed when the pressure in the passage 20 exceeds a predetermined pressure.
The air pressure in the piston chamber 25 and the pressure receiving area of the piston portion of the valve body 27 are determined so that the communication between the piston and the valve is opened. The other is that the passage 20 communicates with the first chamber 7 via the valve body 23 and the passage 24 via the valve body 29. The valve body 29 communicates with the valve chamber 23 and the passage 24 via the pressure of the valve chamber 23. Closed and passage 24
, The communication between the valve chamber 23 and the passage 24 is opened.

The oil is supplied to the operation pipe 5. Pipe line 1
7a is the atmospheric pressure. When the oil pressure in the operating pipe line 5 is equal to or lower than the predetermined pressure, the valve body 27 does not operate and the passage 2
The communication between 0 and the valve chamber 21 is kept closed. Since the valve chamber 23 is pressurized, the valve chamber 29 and the passage 2
The communication of No. 4 is closed. For this reason, the oil in the operation pipe 5 does not flow into the first chamber 7 and the passage 11 and the rod passage 1
2, flows into the third chamber 10, and is supplied to the load through the passage 16. Next, when the oil pressure in the operating pipe line 5 becomes equal to or higher than a predetermined pressure, the valve body 27 is operated to open the communication between the passage 20 and the valve chamber 21, and the oil flows into the first chamber 7 and the piston 1 Press. The piston rod 14 moves and the passage 1
1 is closed to protrude into the third chamber 10, and a high pressure is generated in the third chamber 10 according to the Pascal principle and supplied to the load.

For the return of the apparatus, the switching valve 18 for the cylinder is switched, oil is supplied to the pipe 17a, and the operating pipe 5 is brought to the atmospheric pressure. The valve body 27 is a valve piston chamber 2
5 is returned by the enclosed air pressure of
The communication between the second chamber 8 and the first chamber 7 is closed, and oil is supplied to the second chamber 8 and the return operation side (if necessary) of the load to pressurize the piston 1. Body 29
Moves, and the communication between the passage 24 and the valve chamber 23 is opened, the oil in the first chamber 7 flows out to the operating pipe line 5, and the piston 1 and the piston rod 14 return to the original positions shown in FIG. Then, the rod passage 12 and the passage 11 communicate with each other, and the oil that has communicated with the load and the oil in the third chamber 10 flow out to the operating pipe 5. It is also possible to use a part of the load device as the third chamber so that the piston rod 14 projects. Further, the valve mechanism is provided on the cover block 3c, but it is also possible to manufacture and attach each independently.

FIG. 5 shows that the communication between the operating pipe line 5 and the first chamber 7 shown in FIG. 4 is closed by changing the pressure of the valve piston chamber 25 by air and the oil pressure of the valve chamber 23. , Spring 2
6 and 28. The valve body 27a closes the communication between the passage 20 and the valve chamber 21 by the spring 26, and the valve body 27a moves against the spring 26 due to the increase in the pressure of the passage 20, and the communication between the passage 20 and the valve chamber 21 is established. Open
At this time, when the pressure in the passage 20 becomes equal to or higher than the predetermined pressure, the strength of the spring 26 is reduced so that the valve body 27a operates. Next, the valve body 29 closes the communication between the valve chamber 23 and the passage 24 by the spring 28. At this time, the strength of the spring 28 is greater than the sliding resistance of the valve body 29 at atmospheric pressure in the valve chamber 23, and It is desirable to determine the strength of the spring 28 and the pressure receiving area of the valve body 29 so that the communication between the passage 24 and the valve chamber 23 is opened with the lowest possible pressure in the one chamber 7. Next, by applying air pressure to the valve piston chamber 25, the communication between the passage 20 and the valve chamber 21 can be closed by the spring 26 and the air pressure. In the above description, the operating pipe line 5 and the valve chamber 23 are set to the atmospheric pressure. However, it is necessary to consider the pressure because the pressure may be caused by the flow resistance of the oil.

FIG. 6 shows an example in which the valve bodies 27a and 29 of FIG. 5 are replaced with spherical valve bodies 27b and 29a. The operation is similar to that of FIG.
The communication between 0 and the first chamber 7 is open. The communication between the first chamber 7 and the passage 20 is opened by the pressure in the first chamber 7.

FIG. 7 shows an embodiment of the present invention according to claim 5 in the apparatus of FIG. 2, in which the return operation of the apparatus is performed by a spring 33 instead of the fluid pressure in the second chamber 8. This is effective when the diameter of the cylinder 2 is small and the stroke of the piston 1a is small. Then, the required number is branched from the main operation pipeline, and the apparatus is attached to each branch, so that the work can be performed independently.

FIG. 8 shows the passage 11a and the passage 6 shown in FIG.
1 shows an example in which the passage 20) is communicated with the operating pipe 34. An object is to make the oil pressure supplied to the passage 6 approximate to the oil pressure in the third chamber 10 and to reduce the change in the oil pressure due to the fluctuation in the flow rate of the oil flowing through the pipe line 5a.

FIGS. 9 and 10 show that when the supply fluid is air, the air pressure is changed to oil pressure using a gas-liquid conversion tank.
This shows an example of supply to the device, in which the operating lines 5b and 5
Between c, gas-liquid conversion tanks 35 and 35 a were provided and communicated with the passage 11. In FIG. 9, oil is put into the gas-liquid conversion tank 35, and air is supplied from the upper portion through the operating pipe 5 b, and the oil in the gas-liquid conversion tank 35 is extruded and supplied to the passage 11. 37 and 38 are baffles for preventing bubbling due to oil air. FIG. 10 shows the gas-liquid conversion tank 35.
A floating piston 39 was provided at a to separate air and oil. There is an advantage that the mounting direction of the gas-liquid conversion tank 35a can be freely changed. Even when the supply fluid is oil, the quality of the oil on the load side and the quality of the supply oil may be different. In this case, the operation can be performed by supplying the oil to the air side of the gas-liquid conversion tank 35a. Even when the fluid is other than oil, the operation can be performed by supplying water, for example.

FIG. 11 shows a gas tank 40 provided outside, which is connected to the second chamber 8 through a pipe 41. In FIGS. 1 and 2, the second chamber 8 is a pressure accumulating chamber in which air is sealed, but the volume of the air is reduced by the movement of the piston 1 due to the pressurization of the first chamber 7. Second room 8 because it is proportional
Pressure rises, the required pressure of the second chamber 8 is determined by the device, and the pressure of the second chamber 8 acts negatively with respect to the pressure of the first chamber 7, so that the pressure is higher than the required pressure of the second chamber 8. In order to suppress the rise, the volume of the second chamber 8 must be increased. In the case of the piston rod 14 having a large stroke, the entire device becomes even larger.
For this reason, a gas tank was provided outside. FIG. 12 shows the third room 1
The example in which the pressure accumulating chamber 43 is provided outside the outer gas tank in place of the external gas tank is shown. These can also be used in claims 3 and 4. There is also a usage method in which oil is filled below the gas tank 40, pressurized by air sealed from above, and pressurized in the second chamber 8 by oil. This prevents air in the second chamber from leaking into the first chamber. This is to prevent it.

FIG. 13 shows a cylinder 46 of the liquid chamber block 9 according to the first, second, third, fourth and fifth aspects of the present invention, in which a piston part of a rod 45 integrated with a piston is fitted. Penetrates the cover block 47. It operates according to the pressure of the third chamber 10a and returns according to the pressure of the fourth chamber 44. Use as a cylinder device which outputs a low output when the load is small and outputs a high output when the load becomes large. It is an example.

FIG. 14 shows an example in which the cylinder devices 49, 50, and 51 of the present invention, which are branched from the main operating conduit 5d and operate independently, are attached. The feature is that, by using the air pressure or the spring enclosed in the second chamber for the return operation of the device, each can automatically load by itself without using external force. Work from low pressure oil to high pressure oil.

The oil is supplied to a punching hydraulic cylinder for making a hole in an iron plate, which will be described in connection with an actual working example. During the movement of the piston before the punching operation, the oil pressure supplied to the hydraulic cylinder is supplied at a low pressure corresponding to the load because the load is small.
This shows a state where the device is supplying oil at a low pressure. Next, when the punching operation starts, the load increases, the oil pressure increases in response to the load, and when the pressure exceeds a specified pressure, the high-pressure oil created inside the device is automatically supplied. The punching operation is completed, and the position of the work on which the punching operation is performed can be arbitrarily changed.

[0037]

Since the present invention is configured as described above, the following effects can be obtained.

By incorporating the device of the present invention into the existing low-pressure hydraulic pump equipment, a high-pressure hydraulic pump equipment capable of supplying high-pressure oil at any required time is obtained. Next, when assembling, fix the device with bolts and the like, and connect it to the existing piping with a flange such as a commercially available tube or a union, and it is easy and in a short time because no electrical equipment is required. It can be inexpensively installed.

In the newly installed low-pressure hydraulic pump equipment,
By incorporating the device of the present invention, easily, in a short time,
A high-pressure hydraulic system that can supply high-pressure oil at low cost and at any time when necessary.

According to the second aspect, the set pressure of the oil for switching from the low pressure of the apparatus to the high pressure can be increased without increasing the pressure of the sealed air in the second chamber.

The device according to the invention can be operated simply by connecting it to an operating line. For this reason, the required number is branched from one main working line, and only by installing equipment in each, the low-pressure oil is automatically applied when the load is small, and each time the load is large, automatically. Can be supplied with high pressure oil. In addition, if oil is supplied to a plurality of (for example, 10) loads, a large amount of oil is required. If the oil is supplied at a high pressure required by the load, the power of the pump used increases. The temperature rise of the oil is also large, and a large capacity cooler is required. Oil pumps and accessories for high pressure (for example, solenoid valves, pressure control valves, flow control valves, etc.) are lower than those for low pressure. And expensive. By supplying this low pressure oil, the power of the oil pump is small, a small capacity cooler can be used, and the oil pump, cooler and accessories can be used at low cost, and the pump equipment is maintained. The cost is lower.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a cylinder device according to claim 1.

FIG. 2 is a longitudinal sectional view showing an embodiment of the cylinder device according to claim 2;

FIG. 3 is a longitudinal sectional view showing an embodiment of the cylinder device according to claim 3;

FIG. 4 is a longitudinal sectional view showing an embodiment of the cylinder device according to claim 4;

FIG. 5 is a partial longitudinal sectional view showing an embodiment of the cylinder device according to claim 4.

FIG. 6 is a partial longitudinal sectional view showing an embodiment of the cylinder device of claim 4.

FIG. 7 is a partial longitudinal sectional view showing an embodiment of the cylinder device according to claim 5;

FIG. 8 is a partial longitudinal sectional view showing an embodiment of the cylinder device.

FIG. 9 is a partial longitudinal sectional view showing an embodiment in which a gas-liquid conversion tank is attached to a cylinder device.

FIG. 10 is a partial longitudinal sectional view showing an embodiment in which a gas-liquid conversion tank having an induction piston is attached to a cylinder device.

FIG. 11 is a partial longitudinal sectional view showing an embodiment in which a gas tank is attached to a cylinder device.

FIG. 12 is a partial longitudinal sectional view showing an embodiment in which a pressure accumulating chamber is provided outside a third chamber of the cylinder device.

FIG. 13 is a partial longitudinal sectional view showing an embodiment having a piston integrated with a rod in a third chamber of the cylinder device.

FIG. 14 is a flow sheet showing an embodiment in which a cylinder device is attached to each of branches from a main operating pipeline.

[Explanation of symbols]

Reference Signs List 1 piston 2, 46 cylinder 3, 47 cover block 4 partition block 5, 34, operating pipeline 6, 11, 15, 16, 20, 22, 24, 32, 3
6, 48 passage 7 first chamber 8 second chamber 9 liquid chamber block 10 third chamber 12 rod passage 13 pressure receiving area 14 piston rod 17, 41 conduit 18, cylinder switching valve 19, 31, 42 valve 21, 23 valve chamber 25 valve piston chamber 26, 28 spring 27, 29 valve body 30 magnet block 33 spring 35 gas-liquid conversion tank 37, 38 baffle 39 induction piston 40 gas tank 43 pressure accumulation chamber 44 fourth chamber 45 rod integrated with piston 49, 50, 51 cylinder device

Claims (5)

[Claims] A passage (6) communicating with an operating pipe (5) by a cylinder (2) fitted with a piston (1), said piston (1), a cover block (3) and a partition block (4). ), The first chamber (7) and the second chamber (8) are formed, and the third chamber (10) formed by the partition block (4) and the liquid chamber block (9) is the operating pipe. A piston rod (14), which communicates with the second chamber (8) through a rod passage (12) that communicates with a passage (11) that communicates with a passage (5), is integrated with the piston (1), and It has a pressurized area smaller than the pressure receiving area of the piston (1) and closes the rod passage (12) with the passage (11) open before actuation, then closes the passage (11) during actuation. Close and protrude into the third chamber (10), and keep the second chamber (8) A cylinder device with a pressure-intensifying mechanism that operates by increasing pressure, characterized in that it is pressurized by gas. 2. A cylinder (2) fitted with a piston (1a), said piston (1a) and a cover block (3).
a) a first chamber (7) and a second chamber (8) having a passage (6) communicating with the operating pipe (5) by means of the partition block (4). And a third chamber (10) formed by the liquid chamber block (9) is formed by the rod passage (12) communicating with the passage (11) communicating with the operating pipe (5). The piston rod (14) communicating with the chamber (8) is integrated with the piston (1a) and has a pressure area smaller than the pressure area of the piston (1a), which is smaller than the pressure area of the piston (1a). The rod (12) is closed with the passage (11) open before the operation, and the passage (11) is closed and the third passage is closed during operation. Projecting into the chamber (10) and said second
A cylinder device having a pressure-intensifying mechanism that operates according to an increase in pressure, wherein the chamber (8) is constantly pressurized by gas. 3. A cylinder (2) fitted with a piston (1b), said piston (1b) and a cover block (3).
b) a first chamber (7) and a second chamber (8) having a passage (6) communicating with the operating conduit (5) by means of the partition block (4). And a third chamber (10) formed by the liquid chamber block (9) is formed by the rod passage (12) communicating with the passage (11) communicating with the operating pipe (5). In communication with the chamber (8), the piston rod (14) is integral with the piston (1b) and has a pressurized area smaller than the pressure receiving area of the piston (1b) and the passage (11) is open before actuation. Then, the rod passage (12) is closed. At the time of operation, the passage (11) is closed to protrude into the third chamber (10) and return operation is performed by the fluid pressure of the second chamber (8). To the cover block (3b) via the magnet block (30). A cylinder device having a pressure intensifying mechanism operated depending on the increase in pressure. 4. A cylinder (2) fitted with a piston (1), said piston (1) and a cover block (3c).
And a partition block (4) to form a first chamber (7) and a second chamber (8). The first chamber (7) is provided with a passage (20) and a valve chamber (21) in an operation pipe (5). ), A passage (22), and a third chamber formed by the partition block (4) and the liquid chamber block (9), which communicates with the passage (20), the valve chamber (23), and the passage (24). (10) communicates with the second chamber (8) by a rod passage (12) which communicates with a passage (11) which communicates with the operating conduit (5);
The passage (20) depends on the gas pressure of the valve piston chamber (25) or the spring (26) or a combination thereof.
And a valve body (27, 27a) that closes the communication between the valve chamber (21) and the valve body (27, 27a) that opens when the pressure in the passage (20) rises.
8) having a valve element (29) which closes the communication between the valve chamber (23) and the passage (24) and opens according to the pressure in the passage (24). (1) and having a pressurized area smaller than the pressure-receiving area of the piston (1) and before actuation.
The rod passage (12) is closed with 1) open and in operation the passage (11) is closed to project into the third chamber (10) and the fluid pressure in the second chamber (8) A cylinder device with a pressure-intensifying mechanism that operates by returning to pressure and that operates by increasing pressure. 5. The cylinder device according to claim 1, further comprising a spring (33) for returning the piston rod (14) to actuate the piston rod (14).