EP0291700A1 - Cranked material hoist with a two-direction drive for the hoisted truck - Google Patents

Abstract

The invention relates to an inclined hoist with a truck which is guided on guide rails of the hoist and can be moved to the opposite roof side preferably via a cranked piece arranged in the ridge area of a building. The essence of the invention consists in the fact that a return winch is allocated to the material winch, the hydraulic control being made in such a way that the motor to which pressure fluid is admitted in each case draws the other respective motor with it, which turns off in a throttled manner in the closed circuit. In this arrangement, the circuit is made in such a way that only one spool valve is required. <IMAGE>

Description

The invention relates to an inclined elevator, which has a plurality of guide rails for a cable-drawn carriage guided thereon, with a kink piece arranged between two guide rails in such a way that the guide rails arranged on both sides of the kink piece run on opposite roof sides of a building, the load winch cable from the load winch over one the first guide rail (rail 1) arranged guide roller is guided back to the carriage.

So-called inclined elevators are known, which have guide rails on which a cable-drawn load-carrying means (slide) is guided. This sled is lowered to the floor area, for example there loaded with roof tiles so that it can be moved over the eaves to the area of the roof ridge. To ensure that the guide rails can run as parallel as possible to the roof pitch, inclined elevators of this type are provided with an elbow.

Inclined lifts of the type commonly used in practice are able to bring the material (roof tiles) into the area of the roof ridges. In the relevant industry (roofing trade) there has long been a desire to be able to drive over the roof ridge with an appropriately loaded sled so that the opposite side of the roof can also be loaded - in this case with roof tiles.

Here, however, there is a particular difficulty in guiding the rope. It has therefore already been proposed to guide the load rope coming from the load winch to a deflection roller directly above the roof ridge and to attach the pull point to the sled so that the sled is inevitably pulled over to the other side of the roof, where it then rolls downwards due to its own weight can. When retrieving the sled, the pull point on the sled must be relocated in order to be able to drive over the ridge area under the pulling action of the winch rope. An automatic relocation of the pull point has also been proposed; the known solution has not been able to be implemented in practice, in particular because of the complicated structure and the difficulty of controlled draining to the opposite roof side (DE-OS 20 53 499).

In the form of the above-described proposal is further It has been proposed to manufacture the slide from two mutually telescopic components, each running on its own set of rollers, the two slides changing in their distance from each other when the roof ridge is passed over such that the center of gravity of the slide is moved from one roof side to the other . A special linkage is also required for this, on which the load winch rope engages and with the help of which the carriage's center of gravity should be shifted. This solution too has not been able to prevail in practice due to the complicated structure and the lowering movement which can only be controlled via the brake on the opposite roof side (DE-OS 21 01 256).

Finally, a freight elevator with double-directional propulsion has been proposed, in which a self-contained rope is used which is guided from the load winch motor to the deflection roller at the free end of the first (upper) guide rail and is deflected there. With such a rope guide, there is the difficulty in preventing the inevitable slack rope that forms on the respective unloaded reversing roller. Attempts have already been made to use tensioning rollers or to design the aforementioned reversing rollers as sliding disks (in the manner of known tensioning drives). Such solutions were also unsatisfactory and could not prevail in practice (provisionally granted European patent 01 45 627). The particular problem with respect to the present invention lies in the fact that when the roof ridges are passed over, the pulling winch pulls the load down on the opposite side of the roof, and in addition to this pulling force it must be added that the sled is already trying to on the opposite side of the roof increasing speed to roll down.

The object of the invention is therefore to find a solution in which a controlled transfer of the sled over the ridge to the other side of the roof is possible, in particular at the moment of the sled's transition from one roof side to the other slack rope being avoided, wherein in For example, the speed of the sledge is maintained even when driving downhill on the opposite side of the roof despite considerable loading. Furthermore, the operation should be extremely simple, i.e. there should be no change to the pulling point on the sled, rather the operator should be able to operate the operating lever for opening and lowering in the same way as is known from known inclined lifts (which only drive on one roof side).

Any device on the slide for - possibly automatic - relocation of the pull point should be avoided.

The invention solves the stated problem by the teaching according to claim 1. The return winch additionally arranged hereafter can practically correspond in construction to the usual load winch. The decisive factor is the hydraulic coupling between the load winch motor and the return winch motor in such a way that one of the two motors is pressurized via the pressure oil line (e.g. with 120 bar) while the other motor turns freely in the return line - but throttled in such a way that no slack rope can occur. For example, if you consider that the load winch motor carries the load on one side of the Pulling the roof upwards, the return winch motor, which is throttled in return, will keep the return winch rope taut. Since the load winch motor is extremely stressed, a certain slip in the motor and pump (leakage oil losses) cannot be avoided. After the roof ridges have been exceeded, the load winch motor continues to move in the "downward" direction. In addition, the sled strives to descend increasingly faster due to the weight of the load. This downward movement is slowed down by the throttled circulation of the return winch motor which works as a pump; since at the same time the load winch motor is considerably relieved, it turns faster due to the lack of slippage, so that, as practice has shown, no slack rope is formed in the load winch rope even after the roof is exceeded. As a result, the loaded sledge travels on the opposite side of the roof at a slightly higher speed.

Further advantages of the invention are characterized by the subclaims.

Since only one spool for load winch motor and return winch motor is used according to claim 2 (in principle, two spool valves would also be possible), the operation is extremely simplified. The operator actuates the control slide, which is designed as a 4/3-way valve, by means of a single operating lever as if the inclined elevator was only applied to one roof side.

An advantageous embodiment of the line course of the hydraulic circuit is characterized by claim 4, wherein a 4/3-way valve is used as the control slide and with the switching positions a and c alternately both motors can be pressurized or switched to the unpressurized circulation, the unpressurized circulation being throttled by assigning a lowering brake valve on the output side of the motor working as a pump.

It is also advantageous if the brake release cylinders of both motors (load winch motor and return winch motor) are connected to a common brake release line; This has the advantage that when one of the two motors is acted on, both brakes are released simultaneously, so that a breakaway torque on the brakes is prevented.

Claim 9 has an embodiment of a partial feature of claim 1 to the content. As is known, modern inclined elevators in the area of the lower end of the last (lowermost) guide rail have extensions that slide on this guide rail and can be lowered down to approximately the bottom area. This has the advantage that to improve the loading position, the carriage can be lowered to close to the ground. To be able to guarantee this, i.e. In order to be able to drive over the deflection roller of the return rope as far as possible, the return rope is fastened to the end of the slide facing away from the free end of the first guide rail (rail 1) and the deflection roller for the return rope is arranged below the load winch.

While claim 10 protects the arrangement of the return winch according to the invention, claim 11 relates to the course of the load winch rope. The load winch cable is then guided to the end of the carriage facing the load winch and attached there.

Claims 13 and 14 deal with the arrangement of the deflection roller for the return cable below the load winch; since the return rope must be guided from the winch arranged below the guide rails over the deflection roller to the slide running above the guide rail, a deflection roller of extraordinarily large diameter would have to be used; here it is proposed to provide two deflecting rollers of relatively small diameter in a side-by-side arrangement instead.

The particular advantage of the invention is seen in the fact that by assigning only a commercially available winch with appropriate cable routing and further by assigning the hydraulic line routing according to the invention using a control slide common to both motors, extremely simple operation with reliable carriage guidance when moving up and down on both roof sides is achieved.

The invention is explained in more detail below using an exemplary embodiment.

• Fig. 1 eine Seitenansicht eines Schrägaufzuges
• Fig. 2 eine Draufsicht nach Fig. 1
• Fig. 3 in perspektivischer Darstellung die Seilführung
• Fig. 4 den hydraulischen Schaltplan

Show it:

• Fig. 1 is a side view of an inclined elevator
• 2 is a plan view of FIG .. 1
• Fig. 3 is a perspective view of the rope guide
• Fig. 4 shows the hydraulic circuit diagram

In Fig. 1, 1 denotes an inclined elevator, which consists of several guide rails 7, which are supported on a chassis 5 via a cylinder 6 with variable inclination. It can be seen that the telescopic guide rails 7 are supported on a roof side 4 of a building 2. In the area of the roof ridge 3, a buckling piece 10 is provided, which can be adjusted by means of a winch that can be operated from the ground, or can be designed as a rigid buckling piece.

An additional with 7 'designated guide rail lies on the opposite roof side 4'. It can represent the first (upper) telescopic guide rail of the inclined elevator and can be bent by means of a winch that can be operated from the ground; however, it can also be an extension piece that can be attached by hand or pulled out of the second guide rail.

On the guide rails 7, a carriage 8 is guided (see also FIG. 3) which, by means of the load winch 12, over the Load winch rope 11 is movable on the guide rails 7. The carriage is supported with upper rollers 33 on the upper profile of the guide rail 7; In addition, lower rollers, not shown, are provided which secure the carriage 8 against lifting. With 32, the telescopic rail drive for telescoping the individual guide rails 7 is indicated in FIG. 2; the cable guide for the telescopic rail drive was not drawn in for the sake of clarity.

It can be seen that the load winch motor 16 with the load winch 12 is arranged at the lower end of the last (lowermost) guide rail 7. The load winch cable 11 runs from the load winch 12 via rollers (not shown) arranged in the kink 10 on the opposite roof side 4 'to a deflection roller 13 and from there in the direction of arrow 35 via a pulley 28 to the articulation point 36 on the carriage 8. 3 is in the area of the left side of the carriage 8 in the image plane on the axis of the eccentric brake 29.

A return winch 14 arranged above the load winch 12 with an associated return winch motor 17 serves to drive the return rope 15, which is guided by the return winch 14 to the lower end of the last (lowermost) telescopic section 7. The return rope 15 overflows here a deflection roller 31 designed as a double roller, which is arranged below the load winch 12. The return cable is guided by the deflection roller 31 in the direction of arrow 37 to the carriage 8, passes underneath it and is fastened to the carriage at the fixed point 38 in the end on the right in the image plane of FIG. 3.

In order to be able to travel as far as possible into the floor area with the carriage 8, as shown in FIGS. 1 and 2, extension rails 34 are provided in a known manner. With the arrangement of the deflection roller 31 below the load winch 16 in connection with the fixed point 38 at the upper end of the sled 8 for the return rope 15, it is achieved that the sled 8 can travel directly to the ground via the extension rails 34.

The invention is explained in more detail below with the aid of a hydraulic circuit diagram.

The gear pump designated by 39 conveys the pressure fluid (for example with a pressure of 120 bar) from the tank 22 to the control spools 18, 19 and 20 which are designed as 4/3-way valves and which are combined in a control block 45 .

The control slide 18 serves to act on the hydraulic motor 16 for the load winch 12; the control slide 19 of the application of the motor 32 for the telescopic rail drive (for the retraction and extension of the guide rails 7, 7 ') and the control slide 20 of the application of the cylinder 6 for lifting and lowering the entire telescopic boom.

In the illustrated switching position b of the spool, the gear pump 39 delivers into the tank, i.e. no consumer is charged.

If the control slide 18 is moved into the switching position a, the pressure fluid of the gear pump 39 passes through the line 41 and the check valve 42 and Line 43 via the lowering brake valve 25 to the hydraulic motor 16. Since pressure is simultaneously present in line 27, which acts on the two brake release cylinders 26 of the load winch 12 and the return winch 14, the hydraulic motor 16 can load the winch 12 in the sense of "opening" Drive load.

At the same time, in the switching position a of the control slide 18, the hydraulic motor 17 is connected on the input side via the line 23 to the return line 44 and on the output side via the line 24 in flow through the control slide 18 to the line 21 leading to the return line. When the slide 8 loaded with, for example, roof tiles 9 is pulled up, the hydraulic motor 16 is thus loaded; however, is subject to a certain amount of slip due to the load. The hydraulic motor 17, however, rotates freely in the closed circuit in the return; since the return motor works as a pump, it is dragged along by the load winch motor so that no slack rope is created in the return rope.

When the roof ridge is passed over, the switching position of the control slide 18 is not changed according to the invention. The sled is thus pulled down by the load winch motor 16; at the same time, the load accelerates in the sense of "moving off". Since the load winch motor 16 is still acted upon by the gear pump 39, but on the other hand is relieved of the weight of the load, the slippage caused by the load is eliminated, so that it now turns (limited) faster. The return winch motor, which continues to rotate freely in the return, is limited in its speed by throttling by means of the lowering brake valve, so that the load is released in a controlled manner immediately after the roof ridge is exceeded and the formation of slack rope on the load rope is prevented.

When the control spool 18 is switched to the switching position c, the sequence takes place in the reverse order, i.e. The function of the load winch motor and the return winch motor are essentially the same.

In the switching position c of the control slide 18, the hydraulic fluid supplied by the gear pump 39 via the line 41 and the check valve 42 acts on the line 24 and drives the return winch motor 17 in free passage via the lowering brake valve 25. On the output side, the hydraulic fluid is fed into the return line 44 via the line 23.

The now carried load winch motor 15 turns freely in the return; it is connected on the input side via line 21 and on the output side via lowering brake valve 25 and line 43 while flowing through control spool 18 to line 21 or tank 22.

It goes without saying that the extension of the guide rails (telescoping) in the d. T. known manner is carried out by means of the so-called "carriage zero position"; since the carriage remains at the lower end, the return winch 14 also remains in the rest position. The same applies when retracting the guide rails; here, too, it is not necessary to wind up the return winch 14, since the slide is in its lowest position when retracting. The load winch 12 automatically winds up the load winch rope 11 as a result of the known carriage zero position.

Reference symbol list

• 1 = inclined elevator
• 2 = building
• 3 = ridge
• 4 = roof side
• 4 ′ = roof side
• 5 = chassis
• 6 = cylinder
• 7 = guide rail
• 7 ′ = guide rail
• 8 = sledge
• 9 = roof tiles
• 10 = buckling
• 11 = winch rope
• 12 = load winch
• 13 = pulley for load winch rope
• 14 = return winch
• 15 = return rope
• 16 = load winch motor
• 17 = return winch motor
• 18 = control spool for load winch motor and return winch motor
• 19 = control spool for rail drive
• 20 = control spool for cylinder
• 21 = return line
• 22 = tank
• 23 = line
• 24 = line
• 25 = lowering brake valve
• 26 = brake release cylinder
• 27 = brake release line
• 28 = pulley
• 29 = eccentric brake
• 30 = axis of the eccentric brake
• 31 = pulley for return winch rope
• 32 = motor for telescopic rail drive
• 33 = top rollers
• 34 = extension rails
• 35 = arrow direction
• 36 = fixed point
• 37 = arrow direction
• 38 = fixed point
• 39 = pump
• 41 = line
• 42 = check valve
• 43 = line
• 44 = return line
• 45 = control block
• a = switch position
• b = switch position
• c = switch position

Claims (14)

1. Inclined elevator (1), which has a plurality of guide rails (7, 7 ') for a guided, rope-drawn carriage (8), with a bent piece (10) arranged between two guide rails (7) in such a way that the bent piece on both sides (10 ) arranged guide rails (7, 7 ') on opposite roof sides (4, 4') of a building (2), the load winch cable (11) from the load winch (12) via a on the first guide rail (7 ') (rail 1 ) disposed deflection roller (13) is fed back to the carriage (8), characterized in that the load winch (12) is assigned a Rückholwinde (14), that the respective free ends of the load winch rope (11) on the one hand and the Rückholseiles (15) on the other hand are connected to the carriage (8) and that the load winch motor (16) and return winch motor (17) are hydraulically connected so that when one motor (16 or 17) is acted upon, the other motor (17 or 16) works as a pump in a closed position Circulation glandular lt turns off. 2. Sloping elevator according to claim 1, characterized in that the load winch motor (16) and the Rückholwindenmotor (17), a common control slide (18) is associated. 3. Sloping elevator according to claim 2, characterized in that the control slide (18) is designed as a 4/3-way valve. 4. Inclined elevator according to claims 1-3, characterized characterized in that when a motor (16 or 17) is acted upon by the control slide (18), the return line (21, 23) assigned to this motor (16 or 17) runs bypassing the control slide (18) to the tank (22), whereby the other motor (17 or 16) rotating in a closed circuit on the input side bypassing the control slide (18) to a line (23, 21) leading to the tank (22) and on the output side via the control slide (18) to one to the tank (22 ) leading line (24, 43) is connected (switch positions a and c). 5. Sloping elevator according to claim 1, characterized in that both the load winch motor (16), a lowering brake valve is assigned (25) as the Rückholwindenmotor (17). 6. Sloping elevator according to claim 5, characterized in that the lowering brake valve is assigned (25) to the working as a pump in a closed circuit load winch motor (16) and Rückholwindenmotor (17) on the output side. 7. Sloping elevator according to claim 1, characterized in that the Bremslüftzylinder (26) of the load winch motor (16) associated with the brake and the Rückholwindenmotor (17) associated with the brake are angschlossen on a common Bremslüftleitung (27). 8. Inclined elevator according to claim 1, characterized by a dimensioning of pump power, absorption volume of the load winch motor and the return winch motor, maximum flow rate of the aforementioned motors assigned throttle device (lowering brake valve) such that the motor driving the departing load has a swallowing volume which is greater than the maximum flow rate of the throttling device (lowering brake valve) assigned to the motor circulating in the closed circuit. 9. Sloping elevator according to the preamble of claim 1, characterized in that the return cable (15) on which the free end of the first guide rail (7 ') (bar 1) is fixed facing end of the carriage (8). 10. Sloping elevator according to claim 1, characterized in that the Rückholwinde (14) is arranged above the load winch (12). 11. Sloping elevator according to claim 1, characterized in that the load winch rope (11) from the load winch (12) via the deflection roller (13) from the free end of the first guide rail (7 ') facing the end (track 1) for the load winch (12) of the carriage (8) is guided and fastened there. 12. Sloping elevator according to claim 1, characterized in that the return cable (15) from the Rückholwinde (14) arranged on one (lower) at the free end of the last (bottom) Fürungsschiene (7) guide roller (31) for the load winch (12) opposite end of the carriage (8) and fixed there. 13. Sloping elevator according to claim 12, characterized in that the (lower) at the free end of the last (bottom) Guide rail (7) arranged deflection roller (31) is designed as a double roller consisting of two adjacent single rollers. 14. Sloping elevator according to Claims 12 and 13, characterized in that the deflection roller (31) is arranged below the load winch (12).

Images