JPH0750073Y2 - Hydraulic press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hydraulic press, and more particularly to a hydraulic press in which a booster cylinder and a press cylinder are directly connected.

[Prior art and its problems]

Generally, a hydraulic press is constructed as shown in FIGS.

That is, the hydraulic press shown in FIG.
40 and a hydraulic unit 41 for generating hydraulic pressure are provided separately, and the hydraulic pressure from the hydraulic unit 41 is supplied to the hydraulic cylinder 42 of the hydraulic press main body 40 to raise the press ram 43 of the hydraulic cylinder 42. The press work is performed between the lower heating plate 44 integrally provided on the upper end of the press ram 43 of the hydraulic cylinder 42 and the upper heating plate 46 integrally provided on the press head 45.

The hydraulic press shown in FIG. 6 has a press cylinder 48 for performing a press work and a booster cylinder 49 for sending oil to the press cylinder 48 as separate bodies.

Furthermore, the hydraulic press shown in FIG.
And a booster cylinder 51 are directly connected to each other, and a press ram 52 in the press cylinder 50 is provided with a recess to form an oil chamber 53. When the booster cylinder 51 is operated, the oil chamber 53 of the press ram 52 in the press cylinder 50 is Oil is pressure-fed to the press ram 52 to raise it.

In addition, the hydraulic press shown in FIG.
The press cylinder 55 is directly connected to the press cylinder 55, and an oil chamber 58 is formed in the press cylinder 55 without forming a recess in the press ram 57 unlike the one shown in FIG.
The press ram 57 is raised by pumping oil into the press 58.

However, in the conventional hydraulic cylinder configured as described above, in the case of the hydraulic cylinder shown in FIG. 5, since the hydraulic unit 41 is separate from the hydraulic press body 40,
An installation space for the hydraulic unit 41 is required, which increases the size of the whole and limits the installation place. Moreover, since the hydraulic unit 41 is expensive, the entire hydraulic press is expensive. Further, since a high-pressure type pipe must be used for the pipe between the hydraulic unit 41 and the hydraulic cylinder 42 of the hydraulic press main body 40, the construction cost becomes high.

Further, in the case of the one shown in FIG. 6, a booster cylinder
Since the installation location of 49 is required, the size of the apparatus is increased as a whole, and a high-pressure type pipe must be used for the pipe between the booster cylinder 49 and the press cylinder 48, which increases the construction cost.

In the case of the one shown in FIG. 7, since the booster cylinder 51 and the press cylinder 50 are directly connected to each other, it is possible to downsize the whole, but when used in a sideways or downward direction, the air in the oil chamber 53 is reduced. It is possible to bleed, but if you use it facing upwards, you will not be able to bleed air.

Further, in the case of the one shown in FIG. 8, the air in the oil chamber 58 can be bleeded regardless of the direction in which it is used, but the whole is lengthened in the axial direction, so the application is limited. It had a problem that it was not versatile.

The present invention solves the problems of the conventional ones described above, and makes it possible to easily remove air from the oil chamber and to reduce the size of the whole and to provide a versatile and inexpensive hydraulic press. It is intended to be provided.

[Means for solving problems]

In order to solve the above problems, the present invention provides a booster cylinder body having a cylinder chamber formed therein, and a booster ram slidably provided in the cylinder chamber,
A booster cylinder composed of a piston rod integrally connected to the booster ram, a press cylinder body integrally connected to an upper portion of the booster cylinder and having a cylinder chamber formed therein, and slidably in the cylinder chamber. A press cylinder, which is provided and has a void formed inside and a communication hole that communicates the void with the outside is formed on the upper surface, and a press cylinder integrally connected to an upper portion of the press ram. And a table having a hole formed therein to communicate with the void of the press ram, and an oil chamber is formed between the void of the press ram and the hole of the table via a communication hole on the upper surface of the press ram. Then
The oil chamber is filled with oil, and by the operation of the booster cylinder, the booster ram rises and the piston rod enters the oil chamber to press the oil in the oil chamber, and depending on the amount of entry at that time. It is characterized in that the press ram and the table are raised, and means for connecting a stop valve capable of venting air in the oil chamber is connected to a hole of the table.

[Action]

This invention adopts the above-mentioned means, and when air pressure is introduced into the cylinder chamber of the booster cylinder, the booster ram in the cylinder chamber rises and the piston rod integrally connected to the booster ram moves to the empty space of the press ram of the press cylinder. The oil enters into the oil chamber formed between the place and the hole of the table, and the press ram and the table integrally connected to the upper part of the press ram rise according to the amount of the entry at this time.

In addition, it is possible to easily remove air from the oil chamber through the stop valve provided in the hole of the table.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

1 to 4 show an embodiment of a hydraulic press according to the present invention. FIG. 1 is a schematic diagram showing the whole, FIG. 2 is a circuit diagram of what is shown in FIG. 1, and FIG. FIG. 4 is a schematic sectional view showing the lower limit of the booster ram, and FIG. 4 is a schematic sectional view showing the upper limit of the booster ram.

That is, the hydraulic press shown in FIGS. 1 to 4 has the base frame 1
The booster cylinder 3 is provided inside, and the press cylinder 15 is integrally connected to the upper part of the booster cylinder 3.

The booster cylinder 3 includes a cylindrical cylinder tube 6 between a disk-shaped lower flange 7 and a disk-shaped upper flange 5.
A booster cylinder body 4 in which a cylinder chamber 14 is formed by sandwiching them, a disk-shaped booster ram 8 slidably provided in the cylinder chamber 14, and a booster ram 8 integrally connected to a central portion of an upper surface of the booster ram 8. And a piston rod 9 to

The lower flange 7 is provided with an air port 10 for ascending the booster ram which communicates the outer surface and the inner surface thereof, and the upper flange 5 is provided with an air port 11 for descending the booster ram which communicates the outer surface and the inner surface thereof. Provided, in addition,
A hole 12 for inserting the piston rod 9 is formed at the center of the upper flange 5, and an upper portion of the hole 12 is formed as a stepped portion 13 having a diameter larger than the outer diameter of the piston rod 9.

The press cylinder 15 is the booster cylinder body 4
The cylindrical press cylinder body 16 integrally connected to the upper flange 5, the annular packing holder 17 integrally connected to the upper surface of the press cylinder body 16, the inner surface of the press cylinder body 16 and the packing holder. It is slidably provided in a cylinder chamber 19 formed between the lower surface of 17 and a space 20 inside, and the upper portion of the outer peripheral surface is formed to have a smaller diameter than the lower portion. The press ram 18 has a substantially cylindrical shape and a table 22 integrally connected to the upper surface of the press ram 18 and having a hole 25 having a substantially L-shaped cross section formed therein.

The upper surface of the press ram 18 has a void formed inside thereof.
A communication hole 21 that communicates the hole 20 of the table 22 with the hole 25 of the table 22 is formed. The communication hole 21 allows the step portion 13 of the upper flange 5 of the booster cylinder body 4 and the press ram 18 to be formed.
The inner space 20 and the hole 25 of the table 22 are integrally communicated with each other, and the oil chamber 23 is formed between them.

Further, an air chamber 26 is formed between the small diameter portion above the outer peripheral surface of the press ram 18 and the inner surface of the press cylinder body 16, and the outer periphery of the press cylinder body 16 is formed. An air port 24 for lowering the press ram, which communicates with the air chamber 26 from the surface, is provided.

The press head 27 is integrally connected to the base frame 1 via the side plates 2 and 2.

Next, the operation of the above-described one will be described.

In order to operate the hydraulic press configured as described above, as shown in the circuit diagram of FIG. 2, the direction switching valve 32 is connected to the air pressure source 31 via the air filter and the lubricator, and the air pressure source 31 is connected. 31 and air port 24 for descending the press ram
And the direct switching valve 32 and the booster ram raising air port 10 are connected via a regulator 33 and a speed controller 34, and the directional switching valve 32 and the booster ram lowering air port are connected.
Connect with 11 via speed controller 35,
Further, a stop valve 36 is connected to the opening of the hole 25 of the table 22.

Then, the stop valve 36 is opened to fill the oil chamber 23 with oil through the hole 25 in the table 22, and after the filling, the stop valve 36 is used to fill the oil chamber.
The air inside 23 is evacuated, and after the air bleeding is completed, the stop valve 36 is closed again.

Next, the air pressure from the air pressure source 31 is supplied into the cylinder chamber 14 of the booster cylinder 3 via the direction switching valve 32 and the booster ram raising air port 10 of the booster cylinder 3, and the booster ram 8 in the cylinder chamber 14 is moved upward. Push up to.

By this rise of the booster ram 8, the piston rod 9 integrally connected to the booster ram 8 enters into the oil chamber 23 formed between the press ram 18 and the table 22, and pressure is applied to the oil in the oil chamber 23. The press ram 18 and the table 22 integrally connected to the top surface of the press ram 18.
And the press head 27 provided above the table 22 to perform the press work.

In this case, the output acting on the table 22 can be adjusted by adjusting the air pressure supplied into the cylinder chamber 14 of the booster cylinder 3 by adjusting the regulator 33.

Then, in order to lower the table 22 after the pressing work is completed, the direction switching valve 32 is switched and the air pressure source 31 is fed into the cylinder chamber 14 through the air port 11 for lowering the booster ram.
From the booster ram 8 in the cylinder chamber 14
, The piston rod 9 descends accordingly, the pressure applied to the oil in the oil chamber 23 disappears, and the press ram lowering air port 24 of the press cylinder body 16 of the press cylinder 15 is used. To supply air pressure into the air chamber 26 in the press cylinder body 16, thereby pushing down the press ram 18 and
The table 22 integrally connected to the press ram 18 is also pushed down.

At this time, the air pressure supplied into the cylinder chamber 14 below the booster ram 8 of the booster cylinder 3 is discharged to the outside from the air port 10 via the direction switching valve 32 as the booster ram 8 descends. Become.

In this way, the press cylinder 15 is operated by the operation of the booster cylinder 3 to perform the press work.

As described above, in the hydraulic press according to the present invention, since it is not necessary to use the hydraulic unit as in the conventional case,
The whole can be downsized, and since it is not necessary to use an expensive hydraulic unit, the cost can be reduced.

Further, the air in the oil chamber 23 of the press cylinder 15 is vented by a stop valve provided at the opening of the hole 25 of the table 22.
36 makes it easy.

[Effect of device]

Since the present invention is configured as described above and the booster cylinder and the press cylinder are directly connected to each other, there is no need to provide a hydraulic unit for feeding oil to the press cylinder as in the conventional case, and therefore the entire size can be reduced. At the same time, an inexpensive hydraulic press can be provided. In addition, by forming an oil chamber between the press ram in the press cylinder and the table and communicating the oil chamber with the outside via a stop valve on the table side, it is easy to supply oil and bleed air from the oil chamber. It has an excellent effect such that it can be done.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the entire hydraulic press according to the present invention, FIG. 2 is a circuit diagram of what is shown in FIG. 1, FIG. 3 is a schematic sectional view showing the lower limit of the booster ram, and FIG. 4 is an upper limit of the booster ram. 5 to 8 show a conventional hydraulic press, FIG. 5 is a schematic view showing a hydraulic press of a type in which a hydraulic press main body and a hydraulic unit are separated, and FIG. 6 is a booster. FIG. 7 is a schematic explanatory view showing a hydraulic press of a type in which a cylinder and a press cylinder are separated, and FIG. 7 shows a hydraulic press of a type in which a booster cylinder and a press cylinder are integrally connected and an oil chamber is provided in a press ram. FIG. 8 is a schematic explanatory view showing a hydraulic press of a type in which a booster cylinder and a press cylinder are integrally connected and an oil chamber is provided in the press cylinder. 1 …… Base frame 2 …… Side plate 3,49,51,56 …… Booster cylinder 4 …… Booster cylinder body 5 …… Upper flange 6 …… Cylinder tube 7 …… Lower flange 8 …… Booster ram 9 …… Piston rod 10 …… Air port for raising the booster ram 11 …… Air port for lowering the booster ram 12, 25 …… Hole 13 …… Step 14, 19 …… Cylinder chamber 15, 48, 50, 55 …… Press cylinder 16 …… Press cylinder body 17 …… Packing holder 18,43,52,57 …… Press ram 20 …… Vacancy 21 …… Communication hole 22 …… Table 23,53,58 …… Oil chamber 24 …… Air port for lowering the press ram 26 …… Air chamber 27, 45 …… Press head 31 …… Air pressure source 32 …… Direction switching valve 33 …… Regulator 34, 35 …… Speed controller 36 …… Stop valve 40 …… Hydraulic press body 41 …… Hydraulic pressure Unit 42 …… hydraulic cylinder 4 4 …… Lower hot plate 46 …… Upper hot plate

Claims (2)

[Scope of utility model registration request] 1. A booster cylinder body (4) having a cylinder chamber (14) formed therein, and the cylinder chamber (14).
A booster cylinder (3) comprising a booster ram (8) slidably provided in the inside, and a piston rod (9) integrally connected to the booster ram (8), and an integral part above the booster cylinder (3) Connected to the press cylinder body (1) in which the cylinder chamber (19) is formed.
6) and a communication hole (s) slidably provided in the cylinder chamber (19), having a void (20) formed therein, and communicating the void (20) with the outside on the upper surface ( A press cylinder (15) consisting of a press ram (18) having a perforated portion (21), an upper part of the press ram (18) integrally connected, and a void (20) inside the press ram (18). A table (22) having a hole (25) communicating therewith, and a space (20) in the press ram (18) and the table (2) through a communication hole (21) in the upper surface of the press ram (18).
An oil chamber (23) is formed between the hole (25) of 2), oil is filled in the oil chamber (23), and the booster ram (8) is raised by the operation of the booster cylinder (3). Then, the piston rod (9) is connected to the oil chamber (23).
And presses the oil in the oil chamber (23), and depending on the amount of entry at that time, the press ram (18)
And a hydraulic press characterized in that the table (22) is raised. 2. The hydraulic press according to claim 1, wherein a stop valve (36) capable of venting air from the oil chamber (23) is connected to the hole (25) of the table (22).