CN1427924A - Hydraulic pressure intensifier - Google Patents

Abstract

The invention relates to a hydroelectric pressure intensifier in which the plunger piston (8) and/or the driving spindle (9) of said plunger piston and/or the piston rod (3) of the working piston (2) are driven by electrical means, especially electromotors such as linear motors (11).

Description

Hydraulic Booster

technical background

The invention relates to a hydraulic booster device according to the main claim. In a known type of hydraulic pressure booster (DE-OS 42 23 411), the drive spindle of the plunger generates high pressure via a pneumatic drive piston. Here, this hydraulic booster is directly related to the pneumatic supply, in some cases there is no pneumatic supply, or rather the pneumatic supply is always connected to certain conditions, so the use of the instrument depends on this An air supply.

The invention and its advantages

The hydraulic booster according to the invention with the features of the main claim has the advantage over the prior art that it is not dependent on the supply of compressed air, but instead is supplied by always available energy, ie electric current. On the contrary, like the device mentioned in the above technical background, this device controls the hydraulic system or pneumatic system through the valve, and the valve uses the medium to supply the pressure conversion device, that is, the supply is given by the pressure and the hydraulic transmission oil. energy (DE-OS 26 25 884). Different from the present invention, there is a disadvantage closely related to this energy supply, that is, the hydraulic pressure in this energy supply mode is only used for converting the relatively small driving force of the piston into the high pressure of the hydraulic system inside the pressure conversion device, The working piston has a corresponding driving force. In order to generate the hydraulic high pressure, it is sufficient to generate a small lift force by means of electrical energy. Here it is entirely possible that the driving force generated in the electric tool can also be controlled by means of electrical energy, for example in this way for the generation of a small force at a fast stroke and the insertion of the plunger into the working area, so that A higher pressure is generated in the working area, that is, the electrical energy is converted into a mechanical movement process. This is also an additional advantage of the solution according to the invention.

According to a preferred device according to the invention, the electric motor is used as the driving means, the electric motor can be installed in different ways, and plays a decisive role, at least indirectly for a stroke, that is to drive the spindle, or the plunger, and then the working stroke, the connecting rod linear motion.

According to a preferred arrangement of the invention in this connection, a ball-spindle motor or similar is used as the drive means. In addition to ball spindles and stepped spindles, there are likewise many different embodiments in which the rotational movement of the electric motor can be converted into a linear movement of the drive spindle by means of the arrangement of the spindle wall and the drive means.

According to another device according to the invention, the electric motor is arranged as a linear motor, in which the armature is connected at least indirectly to the plunger or to a drive spindle connected to the plunger and/or to a connecting rod of the working piston, so that through a linear The force first enables fast strokes, and the drive spindle can be used as an armature for a linear motor. For the application of such a linear motor at the connecting rod, after the plunger is inserted into the working chamber, a stored force is given, which is easily dissipated due to its high pressure conversion, here firstly during the fast stroke and return stroke It is possible to make quick adjustments.

According to a further preferred arrangement of the invention, the quick stroke before the working stroke and/or the return stroke after the working stroke is performed at least partially hydraulically.

According to a preferred arrangement of the invention related thereto, there is an annular chamber for hydraulic control inside the cylinder and around the connecting rod and delimited by the power piston. This makes it possible that the hydraulic servo function allows the use of known tools such as servo motors and the like.

According to a preferred arrangement of the invention related thereto, there is a fluid connection between the annular chamber and the storage chamber.

According to the supplementary device of the invention related thereto, the annular piston is arranged axially displaceable around the drive mandrel, along the drive mandrel and the sealing cylinder, from a balancing chamber filled with hydraulic fluid towards the storage piston Delimited and loaded on the side towards the storage piston by a spring determined by the low pressure of the hydraulic system, it is connected by a fluid connection. Thanks to this spring, the balancing chamber 14 acts to equalize the pressure in the storage chamber and the annular chamber, at least during the return stroke.

According to a preferred device of the invention in this connection, there is a fluid connection between the storage chamber and the annular chamber, or rather the balancing chambers are each provided with a control valve, which acts as a non-return valve to block flow from the annular chamber or the annular chamber. The storage chambers flow upward and outflow liquid, and the reverse restricts liquid flow to each chamber.

According to a further preferred arrangement of the invention, the drive spindle or the connecting rod can be driven by a linear motor, as described above.

Further advantages and preferred arrangements of the invention emerge from the following description of the drawings and the claims.

Description of drawings

Two exemplary embodiments of the invention are shown in the drawing and will be described more clearly below.

Figure 1 shows a longitudinal section of a hydroelectric booster, and

Figure 2 shows a simplified diagram of a corresponding embodiment.

Description of the embodiment

In the following two embodiments, all the same components or components with the same function are denoted by the same reference numerals.

The connecting rod 3 is driven by the power piston 2 in the cylinder 1 of the hydraulic booster, and has a hydraulic working chamber 4 . Furthermore, there is a storage chamber 5 , which is connected to the working chamber 4 via a control bore 6 and is delimited by a storage piston 7 . Concentric with the storage piston 7, there is a plunger 8, which is connected to the drive spindle 9. After a certain stroke, the plunger 8 is inserted into the control hole 6, where it is blocked. When the stroke continues, in the working chamber 4 The power piston 2 generates a high pressure proportional to the diameter of the plunger 8. In the first stroke process, that is, in the fast process, the connecting rod 3 falls toward the workpiece, and the power stroke generated by the plunger 8 is used to process the workpiece, such as equipment such as a press.

In the embodiment shown in FIG. 1 the storage piston 7 is fixed coaxially with the plunger 8 on a drive spindle 9 which passes through a linear motor 11 mounted outside the cylinder 1 and fixed to the cylinder. superior. Once the connecting rod 3 has finished its rapid stroke and the plunger 8 is inserted into the control hole 6, the stroke of the plunger 8 is continued by the linear motor, which generates high pressure in the working chamber 4, which in turn advances the connecting rod 3 accordingly. An axially movable annular piston 12 is installed axially on the drive spindle 9, the annular piston is loaded by a spring 13, and a balance chamber 14 is defined on the non-contact surface of the piston and the spring 13, and the other side of the balance chamber passes through the storage piston. 7 Define. This balancing chamber is connected via a conduit 15 not only to the storage chamber 5 but also to the annular chamber 16 formed between the power piston 2 , the cylinder 1 and the connecting rod 3 . A control valve 17 is installed on the conduit section leading to the annular chamber 16 and to the storage chamber 5, which ensures free flow to the storage chamber 5 or to the annular chamber 16, and conversely restricts the flow in the opposite direction By virtue of this, this throttling is adjustable. When flow to these chambers favors a unidirectional return stroke, throttling during fast processes or working strokes of pressure switching devices is shown to be active.

In FIG. 2 an exemplary embodiment is shown only very briefly, but here too the connecting rod 3 can also be actuated via a worm gear 18 , shown only briefly, which is in particular designed as a linear electric motor. Furthermore, in FIG. 2 there is a servomotor 19, an additional accumulator 21 for hydraulic fluid and an asynchronous motor 22, which controls the worm gear 23 of the worm 24, which in turn is connected coaxially with the plunger 8. .

All the features shown in the description, in the patent claims and in the drawings are forms of the invention not only individually but also in any combination therebetween.

legend table

1 cylinder

2 power pistons

3 connecting rod

4 studios

5 storage rooms

6 control holes

7 storage piston

8 plunger

9 drive spindle

10

11 linear motor

12 ring piston

13 springs

14 Balance Room

15 conduit

16 ring chamber

17 control valve

18 Worm gear drive

19 servo motor

20

21 memory

22 electric motor

23 Worm gear drive

24 worm

Claims (10)

1. A hydraulic pressure booster, -In its unit cylinder (1) is installed a working chamber (4) for switching pressure, i.e. low storage pressure for fast process pre-process and return stroke and high working pressure for working stroke, - It has a frontally delimited working chamber (4) and a power piston (2) controllable to the working stroke in the working cylinder (1) by the working pressure, which passes through the cylinder (1) via the connecting rod (3) , - It has a storage chamber (5) mounted in the cylindrical chamber of the cylinder (1) hydraulically connectable to the working chamber (4), from which hydraulic oil flows under storage pressure to the working chamber during rapid processes (4), and flow back to the storage room during the return journey, - it has a plunger (8) with a drive spindle (9) inserted into the working chamber (4) controllable by a high pressure generator after a quick process, and - it has a plunger (8) drive on the opposite face of the working chamber (4) for fast processes, also has a working stroke for generating high working pressures, It is characterized in that, At least the plunger (8) or drive spindle (9) for the working stroke is driven by the electric working tool (11, 18, 22, 23). 2. The hydraulic booster device according to claim 1, characterized in that an electric motor (11, 18, 22) is used as the drive means. 3. A hydraulic booster according to claim 2, characterized in that a ball-spindle motor or similar is used as the electric drive means. 4. Hydraulic booster device according to claim 2, characterized in that the electric motor is constituted by a linear electric motor (11), where the armature is at least indirectly connected to the plunger (8) and/or the power piston (2). Rod (3) links to each other. 5. The hydraulic pressure booster as claimed in claim 1, characterized in that the rapid stroke preceding the working stroke and/or the return stroke after the working stroke are at least partially hydraulically active. 6. Hydraulic booster device according to one of the preceding claims, characterized in that there is a hydraulically controlled hydraulic pressure inside the cylinder (1) and around the connecting rod (3) , especially the annular chamber (16) for the return trip. 7. The hydraulic charging device according to claim 6, characterized in that there is a fluid connection (15) between the annular chamber (16) and the storage chamber (5). 8. Hydraulic booster device according to claim 7, characterized in that around the drive spindle (9) is mounted an axially movable annular piston (12) sealing the drive spindle and the cylinder, which consists of a A balance chamber (14) filled with hydraulic fluid is delimited towards the storage piston (7) and its face connected to the storage piston (7) is loaded by a spring (13) determined by hydraulic low pressure, which is connected by a hydraulic conduit (15) connect. 9. The hydraulic pressure booster according to claim 8 or 9, characterized in that a control valve (17) is installed in the hydraulic connection line between the storage chamber (5) and the ring chamber (16) or the balance chamber (14) , which acts as a one-way valve to close the liquid flowing upward from the annular chamber (16) or the storage chamber (5), and in reverse, it can regulate the liquid flowing to each chamber. 10. The hydraulic booster according to one of claims 4-10, characterized in that the drive spindle (9) or the connecting rod (3) can be driven by a linear electric motor.

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