Mobile working machine

• US 20040159101A1
• Filed: 11/17/2003
• Published: 08/19/2004
• Est. Priority Date: 05/22/2001
• Status: Active Grant

• Current Assignee: Lars Bruun
• Original Assignee: Lars Bruun
• Inventors: Bruun, Lars
• Granted Patent: US 6,983,592 B2
• Time in Patent Office: Days
• US Class Current: 60/413
• CPC Class Codes: F15B 1/08 using a gas cushion; Gas charging devices; Indicators or floats therefor
• CPC Class Codes: F15B 21/045 Compensating for variations in viscosity or temperature
• CPC Class Codes: F15B 21/14 Energy-recuperation means
• CPC Class Codes: F15B 2201/205 using gas
• CPC Class Codes: F15B 2201/30 Accumulator separating means
• CPC Class Codes: F15B 2201/51 Pressure detection
• CPC Class Codes: F15B 2201/515 Position detection for separating means

Abstract

The present invention relates to a mobile handling arrangement with hydraulic circuit, forming part of which hydraulic part of which hydraulic circuit (L) is a lifting cylinder (1) arranged in a lifting arrangement (100) made for handling a variable load together with an accumulator arrangement (6) for recovering and reusing the lowered load energy, the hydraulic circuit also comprising a variable hydraulic machine (3) having two ports (10, 11), the said hydraulic machine being capable, by way of a drive unit (D), of delivering full system pressure in two directions of flow to the said ports, one port (11) being connected to the said accumulator arrangement (6) and the other port being connected to the said lifting cylinder (1), characterised in that the hydraulic circuit (L) comprises a temperature sensor (95) in connection with a gaseous phase part (68B) of the said accumulator arrangement (6) and a control and feedback unit (94) in communication with the said temperature sensor (95), by means of which the filling level in the said accumulator arrangement (6) is adjusted as a function of the temperature in the said gaseous phase part (68B).

Claims

1. Mobile handling arrangement with hydraulic circuit, forming part of which hydraulic circuit (L) is a lifting cylinder (1) arranged in a lifting arrangement (100) made for handling a variable load together with an accumulator arrangement (6) for recovering and reusing the lowered load energy, the hydraulic circuit also comprising a variable hydraulic machine (3) having two ports, (10, 11), the said hydraulic machine being capable, by way of a drive unit (D), of delivering full system pressure in two directions of flow to the said ports, one port (11) being connected to the said accumulator arrangement (6) and the other port being connected to the said lifting cylinder (1), characterised in that the hydraulic circuit (L) comprises a temperature sensor (95) in connection with a gaseous phase part (68B) of the said accumulator arrangement (6) and a control and feedback unit (94) in communication with the said temperature sensor (95), by means of which the filling level in the said accumulator arrangement (6) is adjusted as a function of the temperature in the said gaseous phase part (68B).

2. Mobile handing arrangement according to claim 1, characterised in that the said accumulator arrangement (6) comprises at least two vessels (68, 66A), one of the said vessels (66A) being connected solely to the gaseous phase part (68B).

3. Mobile handing arrangement according to claim 2, characterised in that the said further vessel (66A) comprises a standard container for top-up gas, a so-called gas cylinder, the maximum pressure level for the said vessel preferably exceeding 200 bar.

4. Mobile handing arrangement according to claim 2, characterised by a shut-off element (67) in a line between the said two vessels (68, 66A).

5. Mobile handing arrangement according to claim 2, characterised by a connection (64A) in order to permit the connection of a top-up cylinder (69) to the gaseous phase part (68B).

6. Mobile handing arrangement according to claim 1, characterised by at least one pressure sensor (91), which detects the pressure in the said accumulator arrangement (6).

7. Method in a mobile handling arrangement with hydraulic circuit, which hydraulic circuit (L) comprises a lifting cylinder (1) arranged in a lifting arrangement (100) made for handling a variable load together with an accumulator arrangement (6) for recovering and reusing the lowered load energy, the hydraulic circuit also comprising a variable hydraulic machine (3) having two ports, (10, 11), the said hydraulic machine being capable, by way of a drive unit (D), of delivering full system pressure in two directions of flow to the said ports, one port (11) being connected to the said accumulator arrangement (6) and the other port being connected to the said lifting cylinder (1), together with a hydraulic pump (71) for topping up the said accumulator arrangement (6) with oil, characterised in that the temperature in a gaseous phase part (68B) of the accumulator (6) is registered by means of a temperature sensor (95), that the said registered temperature level is processed by a feedback and control unit (94), which actuates the hydraulic pump (71) in order to fill the accumulator (6) with a charging pressure that varies as a function of the registered temperature.

8. Method according to claim 7, characterised in that the pressure inside the gaseous phase part (68B) is registered by means of a pressure sensor (91), and with the accumulator arrangement (6) filled is set by the feedback and control unit (94) so that it is 5-20% greater than the maximum hydraulic pressure of the hydraulic circuit (L).

9. Method according to claim 7, characterised in that at least one further vessel (66A) is arranged in connection with the gaseous phase part (68B) in a main accumulator of the said accumulator arrangement (6)

10. Method according to claim 9, characterised in that the connection between the said gas cylinder (66A) and the said main accumulator (68) is designed with a shut-off element (67), and that the main accumulator (68) is designed with a connection (64A), by way of which a top-up cylinder (69) is connected up and that the said accumulator (6) is topped up with gas from the said gas cylinder (69) by first filling the gaseous part (68B) in the main accumulator (68) with gas from the gas cylinder (69), with the shut-off element (67) closed, and then opening the shut-off element (67) and using the hydraulic pump (71) to force the quantity of gas inside the main accumulator (68) into the said gas cylinder (66A), and repeating the said process in order to obtain the desired quantity of gas inside the accumulator arrangement (6).