JP4208695B2 - Air-oil conversion intensifier - Google Patents

Description

  The present invention relates to an air-oil conversion intensifier that increases air pressure and converts it into oil pressure.

  As a pressure intensifier of this type, one having a structure disclosed in Patent Document 1 (Japanese Utility Model Publication No. 61-14643) has been known for a long time, and the present applicant continues to manufacture and sell it. The structure is shown in FIGS.

  In this conventional air-oil conversion booster, a pneumatic cylinder A and a hydraulic cylinder B having a smaller diameter are directly connected in the axial direction, and a pressure increasing rod D is projected from a piston C sliding in the pneumatic cylinder A. By pushing C with air pressure and pushing the pressure-increasing rod D into the hydraulic cylinder B, the hydraulic pressure increased from the hydraulic cylinder B is output. On the pneumatic cylinder A, an accumulator E through which oil fluid flows between the hydraulic cylinder B is mounted.

  In the case of this air-oil conversion pressure intensifier, the stroke of the piston C becomes the required pressure increasing stroke S by the pressure increasing rod D, so that the total length of the device (the overall external length) is more than twice this stroke S.

  Based on such a structure, when it is desired to double the output by using a pneumatic cylinder as a double piston, a structure as shown in FIG. 3 can be considered. That is, the pneumatic cylinder is a double cylinder structure in which the first pneumatic cylinder A1 and the second pneumatic cylinder A2 are connected in the axial direction, and the hydraulic cylinder B is directly connected to the outer end of the second pneumatic cylinder A2. The pressure increasing rod D protrudes from the first piston C1 that slides in the first pneumatic cylinder A1, and has a length that penetrates the second pneumatic cylinder A2 and enters the hydraulic cylinder B. The second piston C2 that slides in the second pneumatic cylinder A2 is fixed in the middle of the pressure-increasing rod D and is configured to slide integrally with the first piston C1.

However, if this is done, the total length of the device will be longer by the length of the second pneumatic cylinder A2 than in the case of FIG. That is, the total length becomes three times or more the pressure increase required stroke S by the pressure increase rod D.
Japanese Utility Model Publication No. 61-14643

Accordingly, an object of the present invention is to provide a simple air-oil conversion pressure intensifier capable of double the output by using a pneumatic cylinder as a double piston without increasing the overall length of the device.

In the present invention, a main pneumatic cylinder 1 having a main piston 11 slidably mounted therein is directly connected to a hydraulic cylinder 7 having a smaller diameter in the axial direction so that a pressure increasing rod 10 that slides integrally with the main piston 11 is hydraulic. The auxiliary pneumatic cylinder 2 having the hydraulic cylinder 7 incorporated therein is directly connected to the main pneumatic cylinder 1 in the axial direction so as to form a double cylinder structure with the hydraulic cylinder 7. The sub-piston 12 is connected to the main piston 11 by the connecting rod 13 so as to slide integrally with the main piston 11. The sub-pneumatic cylinder 2 is supplied with air pressure at the same time as the main pneumatic cylinder 1, and is sub-pistoned. 12 is propelled in the same direction as the main piston 11, and the thrust obtained by adding the thrust by the sub piston 12 to the thrust by the main piston 11 is applied to the pressure increasing rod 10. The air-oil conversion intensifier that,
The main pneumatic cylinder 1 and the secondary pneumatic cylinder 2 are connected integrally by installing a partition wall 4 in the middle of one cylindrical tube 3 serving as a common body;
The end of the auxiliary pneumatic cylinder 2 is closed by the rod side cover 6, and the main piston 11 and the auxiliary piston 12 are configured such that the main piston 11 does not reach the partition wall 4 even if the auxiliary piston 12 reaches the rod side cover 6. It is characterized by becoming.

The present invention has the following effects.
(1) The sub pneumatic cylinder directly connected to the main pneumatic cylinder incorporates a small-diameter hydraulic cylinder that is also directly connected to the main pneumatic cylinder to form a double cylinder structure with this hydraulic cylinder. Since the thrust obtained by adding the thrust generated by the auxiliary piston of the auxiliary pneumatic cylinder to the thrust generated by the main piston of the main pneumatic cylinder is applied, the hydraulic output can be almost doubled without increasing the overall length of the device.
(2) The main pneumatic cylinder and the sub pneumatic cylinder are connected together by installing a partition wall in the middle of one cylindrical tube that is a common body, so the structure is simple and the manufacture Becomes easier. In addition, the auxiliary piston can be stably slid along the hydraulic cylinder and the auxiliary pneumatic cylinder.
(3) The partition is installed in the middle of one cylindrical tube, which is the main body common to the main and secondary pneumatic cylinders. However, even if the secondary piston reaches the rod side cover, the primary piston Will not reach, so the increased thrust will not be applied to the bulkhead .
(4) Air pressure can be supplied and discharged in the same way as normal pneumatic cylinders.
(5) The hydraulic cylinder can be easily installed in the auxiliary pneumatic cylinder.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  4 is a horizontal sectional view along the axis of the air-oil conversion intensifier of the present embodiment, FIG. 5 is a vertical sectional view, FIG. 4 is a state when the piston is at 0 stroke, and FIG. 5 is a state at the time of full stroke. It is.

  In this air-oil conversion intensifier, a main air pressure cylinder 1 and a sub air pressure cylinder 2 are integrally connected by installing a partition wall 4 in the middle of one cylindrical tube 3 serving as a common main body. The end of the cylinder 1 is closed by a head-side cover 5 and the end of the auxiliary pneumatic cylinder 2 is closed by a rod-side cover 6 so that the appearance is a single pneumatic cylinder. Therefore, the main pneumatic cylinder 1 and the auxiliary pneumatic cylinder 2 have the same inner diameter and outer diameter.

  A hydraulic cylinder 7 having a much smaller inner diameter and outer diameter than that of the auxiliary pneumatic cylinder 2 is installed with both ends held in the center of the partition wall 4 and the center of the rod side cover 6. 2 and a double cylinder structure. The outer end of the hydraulic cylinder 7 is closed by a bolt-shaped cover 8 fitted therein, and the inner end is opened inside the partition wall 4. The cover 8 is provided with an oil discharge port 9 penetrating inside and outside.

  In the main pneumatic cylinder 1, a disc-shaped main piston 11 having a pressure increasing rod 10 projecting from the center of one surface is slidably fitted, whereas in the sub pneumatic cylinder 2, a cross-section is annular. The sub piston 12 is fitted so as to slide along the outer peripheral surface of the hydraulic cylinder 7 and the inner peripheral surface of the sub pneumatic cylinder 2 (inner peripheral surface of the tube 3). The main piston 11 and the sub piston 12 are connected by two connecting rods 13 and 14 that extend in parallel on both sides of the pressure increasing rod 10 and slidably pass through the partition wall 4, and slide together. . The number of connecting rods 13 and 14 is not limited to two.

  The connecting rod 13 includes a main air cylinder 1 and a sub air cylinder 2, that is, a head side chamber 1 a of the main air cylinder 1 formed on one side of the main piston 11, and a sub air cylinder formed on one side of the sub piston 12. A pneumatic passage 15 communicating with the two head side chambers 2a is provided.

  The pressure increasing rod 10 is inserted into the hydraulic cylinder 7 through a guide hole 16 provided at the center of the partition wall 4 slidably.

  The head side cover 5 supplies and discharges air pressure to the head side chamber 1a of the main pneumatic cylinder 1, and the rod side cover 6 supplies and discharges air pressure to the rod side chamber 2b of the sub pneumatic cylinder 2. A rod-side port 18 is provided for this purpose. The main pneumatic cylinder 1 is provided with an air release hole 19 in the vicinity of the partition wall 4 for releasing the rod side chamber 1b to the atmosphere.

  When air pressure is supplied from the state shown in FIG. 4 to the head side chamber 1a of the main pneumatic cylinder 1 from the state shown in FIG. Since it also flows into the head side chamber 2a of the pneumatic cylinder 2, the main piston 11 and the sub piston 12 simultaneously receive air pressure in the same direction.

As a result, a thrust obtained by adding a thrust by the sub piston 12 to a thrust by the main piston 11 is added to the pressure increasing rod 10, and the pressure increasing rod 10 is a hydraulic cylinder with a thrust combining both the main piston 11 and the sub piston 12. The oil in the hydraulic cylinder 7 is increased and output from the oil discharge port 9. The operation is performed until the stroke end at which the sub piston 12 reaches the rod side cover 6. In FIG. 4, the stroke S between the partition wall 4 and the rod side cover 6 is shorter than the distance between the right end surface of the main piston 11 and the left end surface of the partition wall 4, so that the sub piston 12 reaches the rod side cover 6. However, the main piston 11 does not reach the partition wall 4.

  In order to return the main and sub pistons 11 and 12, air pressure is supplied from the rod side port 18 to the rod side chamber 2 b of the sub air pressure cylinder 2, and a reverse air pressure is applied to the sub piston 12.

It is sectional drawing of a prior art example. It is the front view. It is a general | schematic sectional drawing in the case of making the thing of FIG. 1 into a double piston structure. It is a horizontal sectional view along an axis of an example of the present invention, and a piston is in the state at the time of 0 stroke. Similarly, in a vertical sectional view, it is in a state at the time of a full stroke.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main pneumatic cylinder 1a Head side chamber 1b Rod side chamber 2 Sub pneumatic cylinder 2a Head side chamber 2b Rod side chamber 3 Tube 4 Bulkhead 5 Head side cover 6 Rod side cover 7 Hydraulic cylinder 8 Cover 9 Oil discharge port 10 Booster rod 11 Main piston 12 Sub piston Pistons 13 and 14 Connecting rod 15 Pneumatic passage 16 Guide hole 17 Head side port 18 Rod side port 19 Air release hole

Claims (1)

A hydraulic cylinder (7) having a smaller diameter than the main pneumatic cylinder (1) having the main piston (11) slidably mounted therein is directly connected in the axial direction so as to slide integrally with the main piston (11). The pressure rod (10) is inserted into the hydraulic cylinder (7), and the auxiliary pneumatic cylinder (2) containing the hydraulic cylinder (7) is directly connected to the main pneumatic cylinder (1) in the axial direction, so that the hydraulic cylinder (7) has a double cylinder structure, and in this auxiliary pneumatic cylinder (2), the auxiliary piston (12) is connected to the main piston (11) by the connecting rod (13) and the main piston (11). The auxiliary pneumatic cylinder (2) is slid internally and is supplied with air pressure simultaneously with the main pneumatic cylinder (1) to propel the auxiliary piston (12) in the same direction as the main piston (11). Pressure rod (1 ) In pneumo-hydraulic converter intensifier applying thrust plus thrust by the main piston (further sub-piston thrust by 11) (12) with respect to,
The main pneumatic cylinder (1) and the auxiliary pneumatic cylinder (2) are connected together by installing a partition wall (4) in the middle of one cylindrical tube (3) serving as a common body. Being
The end of the auxiliary pneumatic cylinder (2) is closed by the rod side cover (6), and the main piston (11) and the auxiliary piston (12) are arranged such that the auxiliary piston (12) reaches the rod side cover (6). The air-oil conversion pressure intensifier is characterized in that the main piston (11) does not reach the partition wall (4) .

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