WO2010093338A1

WO2010093338A1 - Sequence cylinder for telescopic crane booms

Info

Publication number: WO2010093338A1
Application number: PCT/TR2010/000028
Authority: WO
Inventors: Kütükcü MEMIş
Original assignee: Hi̇drokon Konya Hi̇droli̇k Maki̇na Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇
Priority date: 2009-02-13
Filing date: 2010-02-03
Publication date: 2010-08-19
Also published as: TR200901075A2

Abstract

Invention is hydraulic cylinder mechanism that extends and returns nested (telescopic) booms which extend and return the load on the crane, in their order. Sequenced boom extension and returning is achieved without using a sequencing valve, by providing new properties to piston (8) and increasing fluid lines. Thus, problems that are faced because of the pressure losses at sequencing valve, are eliminated. Also possibility of overloading on booms due to sequencing problems, is eliminated. During the return of cylinder, hydraulic fluid in fluid lines discharged from the last one to the one before it, so returning process performed under control and in order. Hydraulic fluid passing through one cylinder to another after the previous cylinder is fully loaded or discharged during both extension and return, full extension problems are eliminated and rapid warm up owing to reduced friction surface is prevented. Also, unwanted returns during vertical operations are eliminated by controlling fluid pressure.

Description

SEQUENCE CYLINDER FOR TELESCOPIC CRANE BOOMS

TECHNICAL AREA

Invention is hydraulic cylinder mechanism that extends and returns nested (telescopic) booms which extend and return the load on the crane (winch), in their order.

PREVIOUS TECHNIQUE

Recently, to provide cylinder extension in order, arranging (sequencing) valves are used. These arrangement valves are set to a high pressure level than the previous one, so they lead a sequenced extension. Booms may not extend fully owing to the decrease at pressures of these valves from beginning to end. Yet lifting capacities of every boom are same at manufactured winches. Sequencing is necessary because booms must extend due to undertaken load. Also it returns boom which is proper due to area difference of hydraulic fluid (grease), owing to not-sequencing during the return of booms. This fact reveals that operator of the winch should wait till the booms fully return and extend due to new load, and this causes serious time and work losses. Another problem is broad friction surface due to hydraulic fluids circulation of whole line during extending and returning, which in turn causes rapid warm up and more taper structure of fluid, and it causes leakage as well as lack of providing needed pressure. Extra cooling systems needed to solve the warming problem of hydraulic fluid. This situation increases cost as well as decreases efficiency.

Scratches are observed at cylinder wall surfaces resulting from insufficient bearing (support) between piston and cylinder and deflection of seals that are used with pistons, when extending booms are used. These scratches cause leakage and system become disabled. At 85° - 90° work angles when whole booms are extended and with the load at the edge of hook while there is closed central load holding valve, returning is observed. This event is a danger for work safety.

BRIEF DESCRIPTION OF INVENTION

In the end of studies that we make to eliminate disadvantages of known technique, sequenced boom extension and returning achieved without using sequencing valve , by providing new properties to piston and increasing fluid lines. Thus, problems that are faced because of the pressure losses at sequencing valve, are eliminated. Also possibility of overloading on booms due to sequencing problems, is eliminated. During the return of cylinder, hydraulic fluid in fluid lines discharged from the last one to the one before it, so returning process performed under control and in order. Hydraulic fluid passing through one cylinder to another after the previous cylinder is fully loaded or discharged during both extension and return, and full extension problems are eliminated and rapid warm up is prevented owing to reduced friction surface. Also, unwanted returns during vertical operations are eliminated by controlling fluid pressure.

MEANINGS OF FIGURES

Figure 1. Valve is closed, Fixed (stable) valve cross section at Cylinder extending position

Figure 2. Valve is opened, Fixed (stable) valve cross section at Cylinder returning position

Figure 3. Valve is closed, Cylinder is at extending position Figure 4. Valve is opened, Cylinder is at returning position Meanings of part numbers at the figures are as following; 1. Back cap 1.1. Hydraulic fluid entrance of extension section

1.2. Popet type check valve

1.3. Fluid pass (passing) section 2. Cylinder pipe extension section

3. Fluid discharging line at piston back

3.1. Fluid discharge popet valve entrance at piston back

4. Duct (grooves) 5. Pipe rod

5.1. Cylinder exit of returning fluid

6. Rod head

7. Sequenced extension pipe

7.1. Fluid transferring between cylinders for extending 8. Piston

9. Fluid transferring pipe

9.1. Other cylinder exit line for extension fluid

10. Stroke end valve

11. Delimitation arrange screw 12. Drive

13. Cylinder pipe return section

DETAILED DESCRIPTION OF INVENTION

Invention consist of back cap which contain Hydraulic fluid entrance of extension section (1.1), Popet type check valve (1.2), Fluid pass (passing) section (1.3), Cylinder pipe extension section (2), Fluid discharging line at piston back (3) which contain fluid discharge popet valve entrance at piston back (3.1),

Duct (grooves) (4), pipe rod (5) which contain cylinder exit of returning fluid

(5.1), rod head (6), sequenced extension pipe (7) which contain fluid transferring between cylinders for extending (7.1), piston (8), fluid transferring pipe (9) which contain other cylinder exit line for extension fluid (9.1), stroke end valve (10), delimitation arrange screw (11), drive (12), cylinder pipe return section (13). System assembly is initiated with welding of back cap (1) to cylinder pipe. First popet type check valve (1.2) is screwed to upper part of back cap (1). Second popet type check valve (1.2) is assembled as screwed to back cap's down part, countering first popet type check (1.2) valve. Sequenced extension pipe (7) is screwed to center of back cap (1). The Fluid transferring pipe (9) which is used for fluid transferring and extending cylinder, is welded to rod head (6). Fluid discharging line at piston back (3) is welded to rod head (6) and rod head (6) is welded to pipe rod (5). Duct (4) is clothed (worn) by pipe rod (5), this rod group is assembled into cylinder pipe. Duct (4) is mounted to cylinder pipe by screwing. Stroke end valve (10) is assembled over rod head (6) with screws. Piston (8) assembled to pipe rod (5) by screwing and assembly is completed by a setscrew.

System work by providing pressured fluid to sequenced boom extension and return cylinder is started (initiated) with command lever's completing of circuit. Pressured fluid that is sent to system, comes to hydraulic fluid entrance of extension section (1.1) and passes through poppet type check valve (1.2) that is at the bottom part of back cap (1) after couldn't pass through poppet type check valve (1.2) that is at the upper part of back cap (1) owing to mounting directions of poppet type check valves and then passes through fluid transfer section (1.3) and reaches to cylinder. Pressured fluid in the cylinder, pushes piston (8) and extension process begins. Because fluid doen't pass another cylinder till piston (8) finishes its stroke, it extends without any pressure loss. When piston (8) reach the end of the stroke, fluid passes from fluid transferring section (7.1) on sequenced extension pipe to sequenced extension pipe and than extension pressure discharge line on rod head (6) log, and than another cylinder extension section fluid entrance (1.1). This continues till all booms extend.

Hydraulic fluid passes through cylinder exit of returning fluid (5.1) starting from first cylinder to the last cylinder when cylinder returning process initiated from command lever. It stimulate (effect) stroke end valve (10) on the last cylinder when reach the end of the stroke while it fully returns the last cylinder. Opened stroke end valve (10), allows fluid to pass to fluid discharging line at piston back. Thereby, the cylinder that is driven is started to return. It continues till all the cylinders return.

Claims

1. It is the sequenced booms extender and returner cylinder at pliable boom winches and its feature is consisting of back cap (1), fluid discharging line at piston back (3), duct (4), rod head (6), sequenced extension pipe (7), piston (8) and fluid transferring pipe (9).

2. It is the back cap (1) that is mentioned at claim one and features hydraulic fluid entrance of extension section (1.1) and the section of fluid passage (1.3).

3. It is the piston (8) that is mentioned at claim 1 and it features steel structure and an additional bearing beyond sealing equipment.

4. It is the rod head (6) which is mentioned at claim one and it features fluid discharge popet valve entrance at piston back (3.1), cylinder exit of returning fluid (5.1) and other cylinder exit line for extension fluid (9.1).