DD299362A7 - FLUIDKISSENTRAGVORRICHTUNG WITH PRESSURE CONTROL DEVICE - Google Patents

Abstract

The invention relates to a Fluidkissentragvorrichtung with pressure control device, which regulates the Druckverhaeltnisse the Fluidkissentragvorrichtung for optimal horizontal transport of heavy loads. The aim of the invention is the reduction of energy consumption due to the constant maintenance of the fluid pressure and the Druckverhaeltnisse under the support plate, the prevention of periodic leakage, and the prevention of high Anfahrkraefte. This is achieved according to the invention by continuously comparing the pressure states in the control elements control pressure chamber and functional space with one another by means of a pressure control system consisting of adjusting device and comparison and evaluation device via a pressure-dependent deflecting actuator. Horizontal Transport; Pressure control; Fluid pressure; pressure ratio; sliding surface; Constant pressure; Control pressure chamber; Function space; Support plate}

Description

-2- 299 362 Explanation of the essence of the invention

The object of the invention is to develop a Flülkissentragvorrichtung with a pressure control device, the load-dependent ensures a constant maintenance of Fluiddruckee under the support plate and the pressure ratio between the functional space and Steaerdruckraum, wherein the fluid losses occurring due to periodic outflow, i. Energy losses and associated with the dynamic processes in the form of vibrations are to be prevented and avoids the occurrence of high starting forces.

According to the invention the object is achieved in that are constructed on the path-dependent closing inlet valve, the fluid pressure P ₁ in the control pressure chamber and at the same time on the pressure control valve, the fluid pressure Pj in the functional space. The pressure control valve consists of an adjusting device which has a direct connection line to the functional space and from a comparison and evaluation device which is in communication with the control pressure chamber. Control device and comparison and evaluation are connected to each other via an actuator in such a way that valve control rooms arise. In the valve control chambers in each case there is the pressure state of the control pressure or functional space, so that the pressure-dependent deflecting actuator undergoes a deflection corresponding to the respectively prevailing pressure ratio Pi: P ₂ . An optimal sliding state of the fluid carrying device is achieved when the pressure in the functional space P _{2 is} greater than the pressure in the control pressure chamber P ₁ . This control characteristic is realized by eiru> constant a according to the relation P ₂ = P ₁ (1 + β). The constant a is represented by the arrangement of the comparison and evaluation device.

On the other hand, the difference between pressure in the functional space and pressure in the control pressure chamber P ₂ > Pi prevents pressing of the annular piston seal on the sliding surface and thus an increase in the starting forces. The inlet valve closes path-dependent when reaching the required extension height.

If there is no leakage during the sliding phase at the ring piston seal, d. H. So no outflow of fluid closes the Drucku gelventil and the fluid and thus the energy consumption is virtually zero.

When leakage occurs, eg due to bumps, as much pressure medium is fed in, as is required for the optimal sliding state, ie the required pressure P ₂ in the functional space is kept constant regardless of the fluid consumption. In an electrical control, the signal transmission, which signals the pressure conditions, takes place via electrical pressure sensors in the control pressure and function space in connection with the comparison and evaluation device. Through the connection to the adjusting device, the pressure maintenance is controlled in the functional area.

AusführunQSbelsplele The invention will be explained in more detail below in the following embodiments. Fig. 1: Fluidkissentragvorrichtung with pressure control device Fig. 2: vertical section through the fluidic pressure control device 3 shows a vertical section through the pressure control valve with double diaphragm Fig.4: Vertical section through the ürückregelventil with piston valve Fig. 5: vertical section through an electrical pressure control device

I.Beispiel

On the support platform 3 a Fluidkissentragvorrichtung gem. FIG. 1 shows an inlet valve 1 and a pressure regulating valve 2

arranged that they with the annular piston seal 4 as a sealing element a control pressure chamber 5 and a functional space 6 as

Include regulatory organs. During the pressure build-up phase, the pending on the connecting line 7 fluid flow through the inlet valve 1 in the Control pressure chamber 5 and passed over the adjusting device 2b of the pressure control valve 2 in the functional space β. In the fluidic pressure control device according to FIG. 2, the pressure medium flows via the annular channel 13 into the Control pressure chamber 5 until a pressure state ρ 1 has built up. Is the extension height of the ring piston seal 4, conditioned by

the simultaneously occurring pressure build-up in the functional space 6, achieved, the annular channel 13 is closed by the closing cone 10. This is controlled by the tappet 12, which is in contact with the annular piston seal 4 via a spring 11.

Parallel to this process, the pressure build-up takes place in the functional space 6 via the annular channel 18, channel 21 and line 9 to Value ρ 2 is reached. Are equal pressure conditions in functional and control room 6 and 5 reached, the control gap 19 by

closed the control crevice 14 with sealing seat 20. The arranged on a spring 17 control piston 14 is connected to the plunger 15 on the membrane 24 of the comparison and evaluation device 2 a.

The membrane 24 forms the valve control chambers 22 and 23, wherein the pressure state in the valve control chamber 22 due to the Connecting line 21 and 9 corresponds to the pressure state p2 in the function space 6. In the valve control chamber 23 prevails Pressure state ρ 1 of the control pressure chamber 5 due to the connecting line 8. With changing pressure conditions in Functional space β and thus simultaneously in the valve control chamber 22, there is a deflection of the membrane 24, thus for

open the annular channel 18 and subsequent flow of fluid into the functional space. 6

To set the sliding state, at least one pressure ratio p2 in the functional space 6to ρ 1 in the control pressure chamber 5 of

1: 1 required. In the valve control chambers 22 and 23 thus also prevail pressure ratios ρ 1: p2 = 1: 1, the

Membrane 24 experiences no deflection. In order to achieve a load-dependent increase of the pressure p2 in the functional space β, the control is performed by the Control piston 25 of the comparison and evaluation device 2 a, which the opening force of the diaphragm 24 by means of Guide element 27 is supported. The control gap 19 is opened and via the annular channel 18 as long as pressure medium flows in

the functional space 6 until the pressure equilibrium is signaled via the membrane 24 according to the relationship p2 = p1 (1 + a)

Shape of the decline of the deflection. The adjusting device 26 is closed. Through this automatic pressure control system

a constant a is introduced, and the pressure ratio is governed by the relation ρ 2 = p1 (1 + a).

In this way, too strong pressing of the annular piston seal 4 on the sliding surface 35 and thus an elevated Starting force during the transition from static to sliding friction is prevented, since p2> ρ 1. Regardless of the leakage fluid consumption that can occur between ring piston seal 4 and sliding surface 35, the Working pressure in the function space β depending on the load in this way self-regulating kept constant. If no leakage fluid consumption occurs, the control gap 19 is closed by the control piston 14, and no pressure occurs

unwanted pressure increase.

2.Bolsplel

The Fluidkissentragvorrichtung is carried out according to Example 1, wherein the comparison and evaluation device 2a after Figure 3 consists of a double membrane 3 b with different active surfaces 37 and 38.

3rd example

The Fluidkissentragvorrichtung is carried out according to Example 1, wherein the comparison and evaluation device 2 a of Figure 4 consists of a piston 41 with different active surfaces 37 and 38.

4th example

The Fluidkisäentragvorrichtung is carried out according to Example 1, wherein the electrical pressure control of Figure 5 in such a way that via the pressure transducer 30, the pressure in the control pressure chamber 5 and the pressure transducer 31, the pressure in the functional space β is detected and converted into electrical signals. These are supplied via lines 32 and 33 of the comparison and evaluation device 2a and evaluated electronically. According to the relationship p2 = ρ 1 (1 + a), an electrical signal is generated, which is supplied via the line 34 of the actuator 2 b. In the adjusting device 2 b, the electrical signal is converted into a mechanical manipulated variable, which regulates the fluid flow and thus the pressure p2 in the functional space 6 in accordance with the predetermined pressure ratio, thereby occurring disturbances in the form of leakage fluid are compensated.

Documents considered:

DD-PS 209350 (B 65 G, 7/06)

DE-OS 2653243 (B 65 G, 7/06), 1531833/81 e, 1 / 22nd

US-PS 3826329 (B 65 G, 7/06)

Claims (4)

1. Fluidkissentragvorrichtung with pressure control device, wherein a pressure control valve and a path-dependent closing intake valve, a control pressure chamber and a function space are assigned as control elements and the inlet valve is in communication with a ring piston seal, characterized in that the control pressure chamber (5) via the path-dependent closing inlet valve (1) and the functional space (6) via the pressure control valve (2) are arranged druckbeaufschlagbar, wherein the pressure control valve (2) consists of an adjusting device (2b) and a pressure ratio determining comparison and evaluation (2 a), which are mechanically or electrically interconnected, that between functional space (6) and adjusting device (2 b) is a direct fluidic connection (21,9) and that the control pressure chamber (5) and comparison and evaluation device (2a) are fluidly or electrically interconnected. 2. Fluidkissentragvorrichtung with pressure control device according to claim 1, characterized in that the adjusting device (2 b), consisting of a, via a spring element (17) mounted control piston (14) with plunger (15), annular channel (18) and control gap (19) or sealing seat (20), a pressurizable valve control chamber (22) which is connected via channel (21) and line (9) directly to the functional space (6) and that the pressure ratio determining arranged comparison and evaluation device (2a), consisting comprising a diaphragm (24), a piston (25) with piston rod (26) and guide element (27), a pressurizable valve control chamber (23), which via channel (28) and line (8) with the control pressure chamber (5) is fluidically connected, wherein the pressure-dependent deflecting membrane (24) of the comparison and evaluation device (2a) via the plunger (15) with the control piston (25) of the comparison and evaluation device (2 a) is mechanically connected t. 3. Fluidkissentragvorrichtung with pressure control device according to claim 1-2, characterized in that the pressure ratio determining arranged comparison and evaluation device (2 a) consists of a double diaphragm (36) or a piston valve (41! Each with pressure ratio determining effective surfaces (37,38). 4. Fluidkissentrdgvorrichtung with pressure control device according to claim 1, characterized in that the comparison and evaluation device (2 a) via a Druckaufnehmerr (30) with the control pressure chamber (5) and via a pressure transducer (31) with the functional space (6) via the electrical Lines (32,33) is in communication and via the electrical line (34) signal transmitting to the electromechanically regulating actuating device (2 b) is arranged. For this 4 pages drawings Field of application of the invention, The invention relates to a Fluidkissentragvorrichtung with pressure control device, which regulates the pressures and the pressure ratio of the known per se Fluidkissentragvorrichtung for the horizontal transport of heavy loads. Characteristic of the known technical solutions According to DD-PS 209350 a Fh idkissentragvorrichtung with a pressure control device is known, wherein the functional space is bounded below the support platform edge by a sealing ring as Dichtulement and is pressurized via the inlet valve. The control pressure chamber above the sealing element is pressurized by means of a pressure control device until a defined extension height of the sealing element is reached. In this case, the pressure equalization between the functional space and the control pressure chamber takes place via a connecting channel by means of the pressure regulating device. The disadvantage of this solution results from the constant constant supply of pressure medium in the functional space regardless of the amount of leakage IuId, resulting in an increase in pressure in the functional space of the support device. This pressure increase is reduced by periodic outflow on the sealing element. This results in dynamic processes in the form of vibrations and the result is a high fluid consumption. Due to the path-dependent control of the intake valve no such pressure control, which ensures an optimal sliding state of the support device, since this path-dependent and not pressure-dependent, d. H. not load-dependent. Object of the invention The aim of the invention is to develop a Fluidkissentragvorrichtung with a pressure control device, which compared to the known technical solutions has a much lower energy consumption, due to a reduced fluid consumption and to an improvement in the coefficient of friction and dynamic behavior during load feed leads.