EP3392585A1 - Centrifugal dryer and drying process for crates - Google Patents

Abstract

Drying sling for, via a horizontal conveyor belt (3, 31) in the direction of the spinning station (D) moving trays (Cs, Ci), according to vertical axis rotating centrifugal cage (2) and a vertically movable, acting according to the axis of rotation of the cage rotating lifting table (4 ), wherein within the spin cage (2), coaxial with its axis of rotation, a hold-down consisting of a plunger (5a) and a rotatably mounted counter-pressure plate (5), axially movable (V5) is mounted and the rotation of the blank holder (5) and / or that of the lifting table (4) can be blocked by a brake.

Description

The invention relates to a vertical axis of rotation skimmer for drying individual crates of different dimensions with foldable or rigid sidewalls which are e.g. be used for the transport of fruits and vegetables.

From the EP 1191292 A1 of the same applicant is known a spin with vertical axis of rotation for drying on a pallet stacked crates with hinged side walls. This high-performance centrifuge is only suitable for large car washes and requires an efficient feed and discharge system.

From the EP 1154214 A1 is a sling with vertical axis of rotation for drying stacked crates which all have the same dimensions. This centrifuge is not suitable for drying crates of different dimensions and requires a stacking device at the inlet. The crates are inserted laterally into a laterally openable and lockable cage; These opening and closing chamfers before and after the spin cycle considerably lengthen the production process.

From the JP 2004057909 (A ) is a spin dryer for individual pallets is known, which has a vertical axis rotating sling cage movable jaws for receiving the pallet. The clamping mechanism allows the centering clamping of the pallet which is lifted by means of lifting table vertically from the conveyor belt and pressed against the base plate of the centrifugal cage. The opening and closing of the jaws and accelerating and slowing down the speed of the through Sliding cage weighted suspension cage cause relatively high drying times.

From the JP 2008284413 (A ) is an automatic washing and drying spinner for pallets known. The sling cage rotates about a vertical axis and the individual pallets are lifted by a lifting table of a conveyor belt and pressed against the base plate of the spin cage where the pallet is either held by jaws or locks between immovable attacks. Although the less heavy version without clamping mechanism allows shorter times for the acceleration and deceleration of the centrifugal cage and thus shorter drying times, but the insertion of the pallet, between the fixed stops can often lead to tipping and / or moving the pallet despite Einleitblechen the attacks , which requires a lowering of the pallet and a repetition of the lifting or even a manual intervention.

The invention has as its object to provide a spin dryer of the aforementioned type, which is able to perform effective drying in an extremely short time on individual trays with hinged side walls in the open or closed position and on slopes with fixed side walls, wherein the individually supplied Rising can also have different dimensions.

To solve this problem, the invention proposes a spin dryer which, because of the lightweight construction of the centrifugal cage without clamping and discharge devices, because of the secure support of the risers during lifting from the conveyor towards the cage and the renewed lowering and depositing on the conveyor belt and because of partial temporal superpositions of the movements of the cage and the manipulation organs for the crates, it allows extremely short drying times to achieve. Furthermore, according to the invention, the extremely short drying times are also due to the fact that, because of the extreme acceleration and deceleration times of the centrifugal cage, on the water particles, in addition to the radially acting centrifugal forces, and tangential forces are effective.

The spin dryer according to the invention consists essentially of a rotating about a vertical axis sling cage which is mounted in a frame which is horizontally traversed by at least one conveyor belt with two parallel, spaced belts for the transport of the crates, wherein a waiting station, a spinning station, with catch basin for the Water and with doors for inspection and security, are provided.
In order to accelerate the spin cycle, the wells, which are fed in a known manner, are taken over by the horizontally known, continuously moving, feed conveyor belt by means of a horizontal, intermittent and faster moving conveyor belt to provide a spacing between the taken over tracks and the ascended trays to reach so that a bottom-acting retainer can act which restrains the series of, brought on the feed conveyor belt, crates.

The first supplied tray is stopped in a waiting position for the purpose of possibly collecting the dimensions, the model, any defects and / or the open or closed position of the sidewalls. In case of detection of defects, partially opened or closed side walls or dimensions or models which are not intended for slinging, the crate is ejected. In the case of a tray which belongs to the slingable models, without defects and whose side walls are all open or closed, the tray is transported horizontally to the spinning position.

• noch bevor die vom Förderband herangeführte zu schleudernde Steige die Position senkrecht unter dem Schleuderkäfig einnimmt, wird bereits begonnen den Niederhalter abzusenken und wird der Hubtisch aus seiner tiefer liegenden Ausgangsposition nach oben beschleunigt, so dass bei Erreichen der Position senkrecht unter dem Schleuderkäfig seitens der Steige, der Hubtisch und auch der Niederhalter, in gegen Rotation gebremstem Zustand, den Steigenboden erreicht;
• anschließend wird die Steige durch den Hubtisch vom Förderband abgehoben und in den Schleuderkäfig eingeführt, der Steigenboden ist dabei durch die gebremste Gegenplatte des Niederhalters, bzw. durch den gebremsten Hubtisch, in seiner Position auf dem Hubtisch gegen Verdrehen oder/und Kippen gesichert;
• bevor die Steige ihre endgültige Position innerhalb des Schleuderkäfigs erreicht hat, wird die Rotation der Gegendruckplatte des Niederhalters, bzw. des Hubtisches, freigegeben oder hebt der Niederhalter vom Steigenboden ab und der Käfig beginnt sich zu drehen und somit die Steige zu beschleunigen;
• nach Erreichen der endgültigen Position der Steige im Schleuderkäfig und nach Erreichen der maximalen Schleuderdrehzahl und Schleuderzeit wird der Schleuderkäfig gebremst und, noch bevor dieser zum Stillstand kommt, wird der Hubtisch samt Steige und Niederhalter abgesenkt;
• sobald die Steige den inzwischen gestoppten Käfig verlassen hat, wird sie in Richtung Förderband weiter abgesenkt, dabei ist die Gegendruckplatte des Niederhalters, bzw. der Hubtisch, gegen Drehung blockiert, um ein Verdrehen der Steige zu verhindern;
• sobald die Steige das Transportband erreicht hat und der Hubtisch sowie der Niederhalter in Richtung Ausgangsposition bewegt worden sind, wird diese aus der Maschine entfernt, während der Hubtisch und der Niederhalter ihre Ausgangsposition erreichen und die nächste Steige aus der Warteposition herangeführt wird.

In the spinning position, over the conveyor belt, a double rotating centrifugal cage is provided, which consists of a horizontal base plate from which protrude several vertical rungs down. A number of these rungs are arranged according to the dimensions of the crates according to the largest external dimensions of the crate, while a second row of crates Sprouts are arranged within the first sprouts and according to the external dimensions of the bottom of the small crates. This double cage of the slingshot is rotatably mounted on the frame about a vertical axis and is driven by a motor arranged above it via a hollow shaft within which the ram of a hold-down is mounted which axially engages by means of a motor with a pinion which engages in a toothed rack provided on the ram. is pressed; It is an operation of the hold, eg pneumatic, not excluded. At the lower end of the hold-down a rotatably mounted counter-pressure plate is provided which, for example, pneumatic, can be blocked. It is not excluded that the counter-pressure plate is firmly connected to the plunger and the plunger is rotatably mounted and provided with a brake. In a position below the spin cage, vertically below said hold-down, a lift table is provided vertically over an arm from a position below the conveyor to a position within the spin cage, against the base of said cage. This lifting table is freely rotatably mounted on said lifting arm and may possibly be provided with brake.
The spin coating process according to the invention proceeds according to the following process steps:

• even before the conveyor belt led to be hurled crate occupies the position vertically below the sling cage, is already begun to lower the hold-down and the lift table from its lower starting position is accelerated upward so that when reaching the position vertically below the sling cage on the part of the crate, the lift table and also the hold-down device, in a state braked against rotation, reaches the rise bottom;
• then the crate is lifted by the lifting table from the conveyor belt and inserted into the skid cage, the tray bottom is secured by the braked counter plate of the blank holder, or by the braked lifting table, in its position on the lifting table against rotation and / or tilting;
• before the crate has reached its final position within the sling cage, the rotation of the counter-pressure plate of the hold-down, or the lifting table, the hold-down releases or lifts off the tray and the cage begins to rotate and thus accelerate the tray;
• after reaching the final position of the crates in the sling cage and after reaching the maximum spin speed and spin time of the sling cage is braked and, before it comes to a standstill, the lift table is lowered together with crate and hold-down;
• as soon as the crate has left the now stopped cage, it is further lowered in the direction of the conveyor belt, while the counter-pressure plate of the blank holder, or the lifting table, blocked against rotation, to prevent twisting of the crate;
• as soon as the tray has reached the conveyor belt and the lifting table and the hold-down have been moved in the direction of the starting position, this is removed from the machine, while the lifting table and the hold-down reach their starting position and the next tray is brought from the waiting position.

Practice has shown that, for the purpose of smooth transfer of the crates from the conveyor belt in the centrifugal cage, the crate must be secured against rotation and / or tilting, this is done according to the invention, as described above, by the downholder with braked counter pressure plate, or by braking the lifting table.
In order to prevent malfunctions even in the case of minor twists or inaccurate positioning of the crates on the route between the conveyor belt and the centrifugal cage, the invention proposes to provide at the passage of the water tub which collects the centrifugal water below the centrifugal cage an elastic or articulated suspension lead-in frame which also facilitates the passage Climbing with inaccurate positioning allows, or ensures their trouble-free insertion into the spin cage. According to the invention, this lead-in frame can also be replaced by individual lead-in segments.

The invention does not exclude that the centrifugal cage is actuated by means of a motor whose shaft is offset from the axis of rotation of the cage, in which case, of course, the vertically movable hold-down is coaxially mounted inside the rotating shaft of the cage.

According to an inventive development, the spin dryer can be equipped with two known conveyor belt pairs which act laterally on the bottom edge by holding it by counterpressure; a first pair is arranged in the area of the waiting position and a second pair in the position of the sling. In this case, the said pairs of conveyor belts allow, as a result of the detection of defects, geometric anomalies or partially opened or closed side walls, the emergence of the crates in the waiting station, by dropping downwards. Advantageously, in this case, the first conveyor belt pair which is provided in the waiting station of a simple type with adaptation to the dimensions of the platform, while the second pair of conveyor belts, which is provided in the spinning station, of the type with adaptation to the dimensions of the riser with adaptation by Pivoting the belts according to substantially vertical axes is always to ensure a regular onward transport from one conveyor belt pair to the next pair of belts, even in the case of climbing with successively different dimensions.
In particular, in the case of conveyor belts pairs which act laterally on the tray there is the advantage that eventually a lift table can be used with larger dimensions, which correspond substantially to the dimensions of the bottom of the larger slopes to the pressure on the crates on that area on the ground during the spin phase to leave where the side walls are provided, without burdening the platform floor too much. In the case of the rotatably mounted hold-down, it is possible to start the rotation of the cage, in particular the phase of acceleration of the rotation, before taking the position of complete insertion of the tray in the spin cage, whereby a noticeable shortening of the drying time is achievable.

The invention will be explained in more detail with reference to two schematically illustrated in the attached drawings, preferred embodiments of the invention slings for drying crates, the drawings meet purely explanatory, non-limiting purpose.

The Fig. 1 is a perspective view of the inventive slingshot with a single internal conveyor belt for the crates, without conveyor belts for the supply and discharge of the crates, without protection and inspection flaps and without drainage and collecting plates for water, with a crate with large dimensions with open, lower Sidewalls in waiting position and in a spinning position, which is between the lift table and hold-down, during the phase of introduction into the spin cage, is held.

The Fig. 2 shows a sectional view in side view from the left, in Fig. 1 shown spin, according to a running through the axis of rotation of the centrifugal cage vertical cutting plane.

The Fig. 2a shows the detail of the passage through the water trough with movably suspended Einlenkrahmen for the raised in the direction of the centrifugal cage crates.

The Fig. 3 shows in side view the sling cage together with its motor, the hold-down and the lifting table together with arm and lifting mechanism and with a large crate with unfolded, lower side walls in a spinning position.

The Fig. 4 shows in side view the sling cage together with its motor, the hold-down and the lifting table together with arm and lifting mechanism and with a small crate with unfolded lower side walls in the spinning position.

The Fig. 5 shows in plan view the lifting table together with the lifting mechanism.

The Fig. 6 is a perspective view of the in the Fig. 1 and Fig. 2 shown slingshot with a pair of conveyor belts which acts laterally on the outer edges of the crates in waiting position and a conveyor belt pair which acts laterally on the outer edges of the crates in position vertically under the sling cage.

The Fig. 7 shows in front view of a conveyor belt pair installed in a spinning position which acts laterally on the outer edge of the tray.

The Fig. 8 shows in plan view the in Fig. 7 illustrated conveyor belts pair.

The centrifuge according to the invention for drying the crates Cs, Ci consists essentially of a frame 1 which is traversed by an inner horizontal conveyor belt 3 for the promotion A of the trays Cs, Ci, from a centrifugal cage 2 with a vertical axis of rotation and from lifting / lowering and Retaining members, in particular lifting table 4 and hold-down 5, which act on the platform floor. The crates are fed by known conveyor belts of the spin and discharged at the outlet of this. At the point of transition from the outer feed conveyor belt to the inner conveyor belt 3, a vertically acting 6v retainer 6v is provided. Characterized that the inner conveyor belt 3 runs at a faster rate than that of the outer feed conveyor belt, between the assumed from the conveyor belt 3 and the following, brought on the outer feed conveyor crate, an intermediate distance created in which the retainer 6 6a inserts and thus the zoomed Climb blocked. Within the slings take the crates Cs, Ci a first waiting position B, in which any surveys can be performed and unsuitable for slinging climbing a possible ejection, a detour or a skip can take place. In the Following position D, the crates are thrown in a position lifted from the conveyor belt 3 by a slightly greater amount than the maximum height of the largest skid-capable crate. The raising and lowering of the risers Cs, Ci takes place by the vertical movement V4 of a lifting table 4 which is freely rotatable 4r mounted on an arm which projects from a carriage 4b which runs along vertical guides 4c and is driven by a motor 4m above a belt 4d. The invention does not exclude the drive of said lifting table by means of other mechanisms, such as racks, or the hydraulic or pneumatic drive. In the opposite position to said lifting table 4 is a hold-down, consisting of a pressure plate 5 and a plunger 5a provided with rack 5d, on which a driven by the motor 4m pinion 5e acts. The plunger 5a of the blank holder is vertically displaceable V5 mounted inside the shaft of the motor 2m which drives the centrifugal cage 2. The invention does not exclude the drive of the vertical movement V5 of said plunger 5a by means of various hydraulic or pneumatic actuation, for example. According to the invention, the pressure plate 5 is rotatably mounted at the lower end of the plunger 5a and provided with an example pneumatically controllable, braking device 5g. In this case, the compressed air required for the brake device 5g is supplied from the pressure unit 5f via the hollow plunger 5d of the blank holder.

The slinging may be performed on climbs Cs, Ci, within two limit dimensions defined by the dimensions and shape of the spin cage 2, which consists of a horizontal base plate 2a rotatably driven by the motor 2m, of which two rows of vertical rungs 2s, 2i protrude downwards, which correspond to the outer dimensions of the bottom of the larger spinnable crates Cs, and the smaller whippable crates Ci.
The spin water is deflected by collecting plates which are mounted laterally on the centrifugal cage 2 and from a ring trough 7 below the centrifugal cage 2, which is provided with a drain 7a and a trough 7b below the inner conveyor belt 3, was added.

According to the invention, below the free passage 7c on the ring trough 7 for the vertical passage of the trays Cs, Ci in the direction of the centrifugal cage 2, an introduction frame 7d suspended by elastic or articulated elements 7e may be provided by which possibly also on the lifting table 4, e.g. slightly twisted or not precisely positioned, climbing easily be introduced into the overhead centrifugal cage. This introduction frame 7d may be a closed frame or consist of a plurality of mutually independently elastically movable sections.

According to an inventive development, the only inner conveyor belt 3 with spaced apart belts by two pairs of known, laterally acting on the outer opposite edges of the bottoms of the trays Cs, Ci conveyor belts 30, 31 are replaced by the ejection eventual by surveys in the waiting station B as defective, as geometrically unsuitable for centrifugation or detected with only partially opened side walls supplied crates. The provided in the waiting area B conveyor belt pair 30 may be of the simpler type which is pivotable in a spread position to let the ejected crate freely vertically down through, which may be guided by means of chute provided below in the direction of reject collection area. The following conveyor belt pair 31 which is arranged after the said conveyor belt pair 30, according to the invention, except the pivotal movement 31c in spreading position on the part of the current 31b bands 31a, together with the running guides 31e together with the drive motors 31m, for the purpose of vertically performing V4 of the lifting table 4, also a horizontal Adjusting movement 31d to make even in the case of notable differences in the dimensions of the bottoms of the risers Cs, Ci, the regular changeover from the first pair of bands 30 to the following pair of bands 31 to allow.

Advantageously, in order to achieve a partial elastic adaptation of the bands of said conveyor belt pairs 30, 31 to the dimensional changes of the bottoms of the traversing crates Cs, Ci, these bands of the type with elastic lobes which project obliquely in the direction of the tray bottoms.

• das Förderband 3 läuft in Richtung A um die Steige Cs in die Position vertikal unter dem Schleuderkäfig 2 zu bringen;
• bevor die Steige Cs obgenannte Position erreicht, beginnt bereits die Absenkung V5 des Niederhalters 5 und auch das Anheben V4 des Hubtisches 4;
• sobald die Steige Cs die genannte Position unter dem Schleuderkäfig erreicht hat und das Transportband 3 gestoppt ist, hat der Hubtisch 4 den Steigenboden von unten erreicht und der Niederhalter 5 wird von oben bis auf Kontakt mit diesem herangeführt, die Gegendruckplatte des Niederhalters, bzw. der Hubtisch, ist dabei gegen Verdrehen blockiert um ein Verdrehen der Steige während des folgenden Abhebens vom Transportband zu verhindern;
• anschließend wird die Steige Cs durch den Hubtisch 4 und gegen den Niederhalter 5 vom Transportband 3 in Richtung Schleuderkäfig 2 abgehoben V4, durch den Einleitrahmen 7d geschleust und in den Käfig 2 eingeführt;
• bevor die Steige Cs die endgültige Position innerhalb des Käfigs 2 erreicht, wird der Niederhalter 5 vom Steigenboden abgehoben, bzw. wird dessen Rotation (bzw. die Rotation des Hubtisches) freigegeben und beginnt bereits die Rotation R des Schleuderkäfigs 2,
• nach Erreichen der endgültigen Position der Steige Cs, Ci im Käfig 2, nach Erreichen der maximalen Schleuderdrehzahl und Schleuderzeit, wird der Käfig 2 gebremst und noch bevor dieser zum Stillstand kommt wird der Niederhalter 5 mit frei drehbarer Gegendruckplatte aktiviert um die Steige, zusammen mit dem nach unten bewegten Hubtisch, teilweise aus den (noch rotierenden) Käfig 2 zu drücken;
• sobald die Steige den inzwischen in Ausfahrposition gestoppten Käfig verlässt, wird sie auf das Förderband 3 abgelegt, dabei ist die Gegendruckplatte des Niederhalters 5, bzw. der Hubtisch 4, gestoppt um ein Verdrehen der Steige zu verhindern;
• sobald die Steige das Transportband 3, 31 erreicht hat und nachdem der Niederhalter und der Hubtisch vom Steigenboden abgehoben, bzw. abgesenkt worden sind, wird diese durch das Transportband 3, 31 aus der Maschine befördert, während der Hubtisch 4 und der Niederhalter 5 ihre Ausgangspositionen erreichen und die nächste Steige für die Schleuderung aus der Warteposition B herangeführt wird.

In order to achieve that the spinning times, including loading and unloading of the spin cage, are extremely short, the individual working phases run according to the invention in the following sequence:

• the conveyor belt 3 runs in the direction A to bring the tray Cs to the position vertically below the sling cage 2;
• before the tray Cs reaches the above-mentioned position, the lowering V5 of the hold-down 5 and also the lifting V4 of the lift table 4 already begin;
• as soon as the tray Cs has reached said position under the centrifugal cage and the conveyor belt 3 is stopped, the lifting table 4 has reached the bottom of the tray and the blank holder 5 is brought from above to contact it, the counter-pressure plate of the blank holder, or the Lifting table, is blocked against rotation to prevent twisting of the crate during the subsequent lifting of the conveyor belt;
• Subsequently, the tray Cs is lifted by the lifting table 4 and against the hold-down 5 from the conveyor belt 3 in the direction of the centrifugal cage 2 V4, slid through the lead-in frame 7d and inserted into the cage 2;
• before the tray Cs reaches the final position within the cage 2, the hold-down 5 is lifted from the tray bottom, or its rotation is released (or the rotation of the lifting table) and already starts the rotation R of the spin cage 2,
• after reaching the final position of the crates Cs, Ci in the cage 2, after reaching the maximum spin speed and spin time, the cage 2 is braked and even before it comes to a halt, the hold-5 is activated with freely rotatable counter-pressure plate to the crate, together with the lifting table moved downwards, partly to press out of the (still rotating) cage 2;
• as soon as the crate leaves the cage, which has meanwhile been stopped in the extended position, it is deposited on the conveyor belt 3, the counterpressure plate of the hold-down device 5, or the lifting table 4, being stopped in order to prevent the crates from rotating.
• as soon as the crate has reached the conveyor belt 3, 31 and after the hold-down and the lifting table have been raised or lowered from the crate floor, it is conveyed out of the machine by the conveyor belt 3, 31, while the lifting table 4 and the gripper 5 have their starting positions reach and the next tray for the sling from the waiting position B is introduced.

The temporal overlaps of the aforementioned working phases of the individual machine parts acting on the tray, in particular during the acceleration and deceleration phases, make it possible to decisively increase the productivity of the machine.

Claims (10)

Drying sling for, via a horizontal conveyor belt (3, 31) in the direction of the spinning station (D) moving crates (Cs, Ci), with according to the vertical axis rotating centrifugal cage (2) and a vertically movable, acting according to the axis of rotation of the cage rotating lifting table (4 ), characterized in that within the spin cage (2), coaxial with its axis of rotation, a hold-down consisting of a plunger (5a) and a rotatably mounted counter-pressure plate (5), axially movable (V5) is mounted and that the rotation of the blank holder and / or that of the lifting table (4) can be blocked by a brake. A spin extractor according to claim 1, characterized in that the counter-pressure plate (5) of the hold-down is fixedly connected to the lower end of the push rod (5a), that the push rod (5a) of the hold-down is coaxial with the axis of rotation of the spin cage (2) and axially (V5) is movably mounted and that the rotational movement of the plunger can be stopped by a brake. A spin extractor according to claim 1, characterized in that below the centrifugal cage a collecting basin (7) for the centrifugal water is mounted vertically below (2) of the centrifugal cage a passage (7c) for the passage through the lifting table (4) vertically towards the cage ( 2), or conveyor belt (3, 31), moving crates (Cs) that below or within this passage (7c) an introduction frame (7d) or independent inlet segments are suspended by means of elastic or articulated elements (7e). Drying spinner according to claim 1, characterized in that in front of the spinner station (D) a waiting and recognition station (B) is provided in which on the crate (Cs, Ci) surveys geometric and / or chromatic and / or regarding the position of the hinged side walls and / or defects are performed and that the recognized as deficient, non-spinnable crates are ejected in this station. A spin extractor according to claim 1, characterized in that the single transport belt for the further conveying (A) of the trays (Cs, Ci) through the waiting and recognition station (B) and by the spinning station (D), a conveyor belt (3) with two parallel, under spaced, bands or chains is between which the lifting table (4) moves. A spin extractor according to claim 1, characterized in that the fed (A) crates (Cs, Ci) act through two separate groups of conveyor belts (30, 31) of the type which act on the lateral edges of the crate through the waiting and bumping station (B ) and through the spinning station (D), wherein the first group (30) of belts for the waiting and bumping station (B) can perform a sufficiently wide pivotal movement (31c) to eject the discarded trays, by falling down, and at least the second conveyor belt group (31) for the spinning station (D) has a horizontal movement (31d) for adaptation to the irregularities of the lateral edges of the trays of the trays, or to the variable dimensions of the trays of the trailing trays (A ) Climb, can perform. Drying spout according to claim 1, characterized in that the individual conveyor belt (3) or the conveyor belts (30, 31) stacked trays (Cs, Ci) can be fed (A), wherein the stack height does not exceed the maximum internal height of the spin cage (2) , Drying method carried out by means of the spin dryer with the features cited in claims 1 to 7, characterized in that the working phases of the conveyor for the trays (Cs, Ci), the lifting table (4), the blank holder (5) and the centrifugal cage (2) be controlled so that this partially temporal overlays, in particular as regards the acceleration and braking phases, thereby increasing the productivity of the spin dryer. Drying process carried out by means of the spin dryer with the features mentioned in claims 1 to 7, characterized in that the hold-down (5), even before the tray (Cs, Ci) has taken the position under the centrifugal cage (2) begins to lower and Also, the lifting table (4) begins to lift, as soon as the tray by means of conveyor belt (3, 30, 31) has reached the mentioned position to reach the tray bottom, then that the lifting table (5), the tray (Cs, Ci) in lifts the sling cage, wherein the hold-down (5), or the lifting table (4), as long as the tray has not reached the spin cage (2) is blocked against rotation (R), that as soon as the tray penetrates into the spin cage (2), the rotation (R) of the blank holder, or of the lifting table (4) is released and, after further penetration of the tray, the centrifugal cage begins its rotation and accelerates that as a result of reaching the full penetration of the tray i n the spin cage and as a result of reaching the maximum speed for a predetermined spin time, the spin cage (2) is braked while the lift table (4) and also the hold down (5) descend around the tray even before the spin cage is completely stopped, to press out of the cage (2) that as soon as the tray has left the cage (2) and has come to a standstill, it is deposited on the conveyor belt (3, 31), wherein the hold-down device (5) or the lifting table (5) 4) is stopped against rotation and that subsequently, after the lifting table (4) and the hold-down (5) have begun to move in the direction of the starting position, the conveyor belts (3; 31) the crates (Cs, Ci) from the machine during the lift table (4) and the hold (5) reach their starting position. Drying method according to claim 8, characterized in that the brake (5g) of the blank holder (5), or the brake of the lifting table (4) is not actuated as long as the tray (Cs, Ci) is inside the centrifugal cage (2).

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