CN110418930B

CN110418930B - Pin baker

Info

Publication number: CN110418930B
Application number: CN201780078212.3A
Authority: CN
Inventors: 乌夫
Original assignee: Foshan Arc Industrial Equipment Manufacturing Co ltd
Current assignee: FOSHAN ARC INDUSTRIAL EQUIPMENT MANUFACTURING Co.,Ltd.
Priority date: 2016-10-18
Filing date: 2017-10-12
Publication date: 2021-02-26
Anticipated expiration: 2037-10-12
Also published as: WO2018073094A1; DE102016119864A1; CN110418930A; DE112017005261A5

Abstract

The invention relates to a pin oven (1) for drying a coating of at least one tubular container (2), comprising at least: an oven interior (3), in which an approximately vertically oriented transport plane (4) is designed, wherein an inlet air chamber (5) is provided upstream of the transport plane (4) and an outlet air chamber (6) is provided downstream of the transport plane (4) within the interior (3); at least one U-shaped channel (7) is designed on the transport plane (4) and leads to the exhaust chamber (6); a conveyor device (8) with a plurality of pins (9), wherein each pin (9) can at least partially protrude into a U-shaped channel (7) and is designed and manufactured in a shape that can accommodate a tubular container (2); -designing and installing a circulation device (10) at least in the interior space (3) of the oven, which can be used for heating a fluid located in the interior space (3) of the oven; at least one first flow-guiding device (11), which is designed and mounted such that it can be used to deflect a fluid in the region of the open side (12) of the U-shaped channel (7).

Description

Pin baker

Technical Field

The present invention relates to a pin oven for drying at least one coating of a tubular article. In particular, the present invention can be used to cure coatings on beverage cans.

Background

In the manufacture of metal cans for products such as carbonated beverages. As is known, beverage cans generally have a cylindrical outer surface and are provided with a coating, such as paint or colour. In order to stabilize the coating, a curing treatment must be performed periodically after coating. A pin oven can be used here, in which the coating can be heated by convection and dried or cured, or even baked.

Pin ovens typically have a chain feeder carrying pins that will travel along a defined (typically multi-loop winding), especially through an internal curved path of the pin oven. Usually the product pots are semi-finished, that is to say have one end open, but have been coated, the pins inserted and guided by a chain conveyor for drying through the inside of the oven. To improve the efficiency and uniformity of convection heating, the product cans inserted into the pins are directed on one side toward the U-shaped channel as they pass through the furnace interior. In this case, the walls of the channels are perforated, which facilitates a relatively uniform gas permeation over the surface of the product tank, in particular over the bottom of the product tank and the outer surface of the tank jacket.

However, when introducing a can container into such a U-shaped channel, it must be taken into account that it should be ensured at all times that a minimum safety distance is maintained between the can container and the channel wall of the U-shaped channel, due to possible deviations in the shape of the can container and/or due to a relatively inaccurate positioning of the can container on the pin. However, this minimum distance easily leads to the fact that, although the gas flow can flow through the perforations of the channel walls, it cannot flow uniformly over the whole, in particular it cannot heat up uniformly. This can be observed in particular in the end region where the tank container remains open, this portion being towards the open side of the U-shaped channel or even beyond the U-shaped channel side walls. This end region preheats more slowly than the rest of the tank vessel, resulting in a longer overall heating time.

Disclosure of Invention

Based on this situation it was an object of the present invention to at least partly solve the described problems with reference to the state of the art. In particular, the pin oven should be usable for drying the coating of at least one tubular container, which is heated most uniformly and dried most uniformly, wherein the residence time of the container in the pin oven should be as short as possible. In addition, the pin baker should satisfy cost-benefit requirements as far as possible, save space, easily transport, save resources or energy. Furthermore, the pin oven should have a higher thermal and/or current-technical efficiency than conventional pin ovens.

For this purpose, a pin oven for drying a coating of at least one tubular container is facilitated, the pin oven comprising at least:

an oven interior in which an approximately vertically oriented transport plane is designed, with an inlet air chamber upstream of the transport plane and an outlet air chamber downstream of the transport plane of the interior;

at least one U-shaped channel is designed on the transport plane, and the open side of the U-shaped channel is directed to the exhaust chamber;

-a conveyor with a plurality of pins, wherein each pin can at least partially protrude into a U-shaped channel and is designed and manufactured in a shape capable of accommodating a tubular container;

at least one circulation device, which is at least partially installed in the internal space of the oven and can be used to circulate the fluid inside the oven;

at least one flow guide device, which is designed and mounted for deflecting the fluid in the region of the open side of the U-shaped channel.

The relevant content in the above technical solution is explained as follows:

the pin oven should be operable at a temperature in the range of 100 degrees celsius to 300 degrees celsius, preferably between 150 degrees celsius and 250 degrees celsius. The fluid heated in the pin oven can circulate inside the oven, in particular can move around a horizontally oriented axis. In this case, the fluid heated by the heating means is accelerated by the circulating means during the furnace stroke through which it passes, and then flows through the inlet chamber, the U-shaped channel and the outlet chamber in this order. Where appropriate, it can be designed such that: after passing through the exhaust chamber, the fluid can in particular be returned (in a closed circuit) to the circulation device and/or to the inlet chamber along the heating device.

A preferred embodiment is one in which the tubular container is made at least of metal or of one metal sheet. Preferred embodiments of the tubular container are can-, tube-or sleeve-type metal sheets. A preferred design of the tubular container is open on one side, in particular (only) at the top. In addition, the tubular container is preferably designed with a (pre-) coating based on water or solvent. The spray coating can be carried out as a precoating treatment, for example comprising at least one primer layer, lacquer layer and/or colour layer.

Preferably, the transport plane is oriented approximately vertically, coinciding with the vertical plane or forming an angle of at most 25 °, in particular an angular orientation of 15 ° or 13 °. Particularly preferred embodiments provide that the approximately vertically oriented transport plane forms an angle with the vertical plane in the range from 5 ° to 25 °, in particular between 10 ° and 15 ° or even between 10 ° and 13 °. Preferably, the course of the U-shaped channel in the conveying plane has at least one upper curved portion, at least one lower curved portion and at least one straight portion, the upper curved portion being connected to the lower curved portion by the straight portion. According to an advantageous embodiment, it is proposed that at least one of the U-shaped channels has a channel floor oriented parallel to the transport plane and two channel side walls which face one another and extend beyond the channel floor and in particular extend toward the exhaust chamber. The opposite side of the channel bottom wall of the U-shaped channel is of open design, or the U-shaped channel is provided with an open side. Preferably, the channel side walls of the U-shaped channel are provided with a hole-like structure, in particular using at least one metal sheet provided with perforations. This allows the fluid to pass through the channel walls uniformly. The perforations of the channel walls may be (circular or oval) round holes and/or slots. Particularly preferred embodiments are those in which the channel bottom has notches and/or round holes and the channel side walls have round perforations.

A preferred embodiment provides that the conveying device has at least one chain conveyor. In a particularly preferred embodiment, the conveying device has at least one, in particular circumferentially drivable, conveyor chain, on which a plurality of pins are arranged. The pins can be designed substantially perpendicular to the transport plane at a distance from the conveyor chain. In particular for carrying the tubular container, the (each) pin can contact the inside of the container, in particular the inside of the closed end side of the container.

The circulation device may comprise at least one (drivable) impeller on which a plurality of blades may be designed. A preferred embodiment provides that the circulation device has at least one blower, a (circulation) fan or a compressor. In addition, it is preferred if the circulation device has a housing, in particular an impeller housing. At least one impeller can be provided in the impeller housing. Furthermore, the circulation device should have at least one (inlet flow) nozzle. The (inlet flow) nozzle can be designed upstream of the at least one impeller according to the flow technology. A preferred embodiment is to integrate the (inlet flow) nozzle into the housing or a separate component, which is then fixed by means of a nozzle holder into the circulation device frame inside the furnace. Preferably, the parameters of the circulation device should be such that the fluid can be accelerated to a flow rate of 20 to 40m/s, in particular in the region of the U-shaped channel.

The preferred design of the circulation device should have a frame. At least one impeller is mounted on and/or in the frame. In a preferred embodiment, the circulation device has at least one impeller, which should preferably be mounted in the frame. The frame may extend at least partially into the interior of the oven. Preferably, the frame has at least one (mounting and/or fixing) plate and/or at least one strut. At least the first sheet of the frame is (directly) connected to the (inner) wall of the oven. A particularly preferred embodiment is one in which the first sheet is mounted (directly) on or even inserted into the (inner) wall of the oven. At least one impeller may be secured to the first sheet of material. The second sheet of the frame can be designed and/or mounted inside the oven, in particular parallel to the first sheet. A preferred embodiment provides that the frame has at least two or even at least four struts. The struts may be arranged parallel to each other. Preferably, the support extends from the first sheet material into the interior of the oven. The brace may extend between the first sheet of material and the second sheet of material. In particular, the strut and/or the second plate can be used for fixing the at least one air inlet nozzle. A preferred design is that the air inlet nozzle should be fastened to the top end of the pillar directed towards the interior of the oven. At least one strut is mounted within the impeller housing and/or extends through the impeller housing. The impeller housing may be mounted and/or fixed to the frame of the circulation device. A preferred embodiment provides that the (maximum) distance between the struts of the frame and the circulation device (the radially outermost point or the outer diameter of the at least one impeller) is in the range from 1mm to 100mm, in particular between 15 mm and 75 mm. This smaller distance makes it possible to integrate the spiral housing more advantageously in the circulation device.

The fluid may be a gas or a mixture of gases. Furthermore, the gas or gas mixture may at least partially contain a liquid, such as water. The preferred fluid is air. Alternatively, an inert gas such as nitrogen may be used as the fluid.

At least one flow guide device, which is designed and mounted for deflecting the fluid in the region of the open side of the U-shaped channel. In this relationship, the diversion of the fluid occurs primarily by: at least a portion of the fluid and/or fluid flowing through the U-shaped channel from the side walls of the channel (from the inlet chamber to the outlet chamber) is diverted from one side of the channel, or both sides of the channel, to the central region of the channel. In this case, a preferred option is that the fluid deflection occurs before, during and/or shortly after passing through the open side of the U-shaped channel.

According to an advantageous embodiment, it is proposed to design and install at least one flow guide device and to divert a portion of the flow which faces the open side of the U-shaped channel section, with convergence taking place at the end region (13) of the container (2) into which the pin (9) is inserted, which end region faces the venting chamber (6). The end region of the container facing the venting chamber is in particular the container part region in which the cutting edge and/or the open container port are designed.

According to an advantageous embodiment, a first flow guide device is provided with a plurality of ventilation openings, which are arranged on the return wall of the exhaust chamber. Preferably, the first air guiding device has at least about 100 openings, even at least 200 openings. A further preferred embodiment provides that the openings are circular or oval. The diameter of the openings may (e.g. all openings) be between 0.1mm and 100mm, preferably between 0.1mm and 50 mm or even between 2 mm and 25 mm. In particular, the return wall should be a plate which is installed in the exhaust chamber. A preferred embodiment is that the return wall should be essentially parallel to the transport plane. Preferably, the return wall should be at a distance from the U-shaped channel. A particularly preferred embodiment provides that the distance between the open side of the U-shaped channel and the return wall is in the range from 1 cm to 30 cm, in particular from 2 cm to 30 cm. In addition, at least part of the transport device is designed between the U-shaped channel and the return wall. A preferred embodiment is that the return wall should overlap the (entire) course of the U-shaped channel and/or cover the course.

In a preferred embodiment, at least one first flow guide device is provided with an aeration opening. In this case, the ventilation openings are preferably designed in the return wall located in the exhaust chamber. A further preferred embodiment is one in which the (each) arrangement of vent openings is capable of venting at least a portion of the fluid entering the U-shaped channel. Thus, the fluid flowing out of the U-shaped channel, in particular in the region of the open side of the U-shaped channel, can flow closer and/or closer to the container and/or along the container.

According to an advantageous embodiment, it is proposed that the opening should be designed (substantially) only in the area of the opening in the return wall, which corresponds to the receptacle into which the pin is inserted. Preferably, the open-pored regions are arranged in a plurality of rows along the course of the U-shaped channel. Preferably, the openings are designed according to the course of the U-shaped channels in the return wall. Preferably, the shape of the open area has at least one upper curved portion, at least one lower curved portion and at least one straight portion, the upper curved portion being connected to the lower curved portion by the straight portion. Furthermore, it is preferred that the opening region should have an opening region width which is smaller than or equal to the distance between the side walls of the U-shaped channel. A particularly preferred embodiment provides that the width of the opening area remains substantially constant along the course of the opening area.

According to an advantageous embodiment, it is proposed that the at least one first air guiding device is equipped with at least one first air guiding element which is arranged in the region of the opening side of the U-shaped channel and is connected to the U-shaped channel. Preferably, the first flow-guiding part has a deflection surface which faces laterally towards the channel side wall of the U-shaped channel. Preferably, the at least one first air guiding element is formed by a deflector plate or an air deflector. The first flow guide element preferably extends from one end of the channel side wall (pointing towards the outlet chamber) towards or into the outlet chamber and/or towards the middle of the U-shaped channel. In addition, the first flow guide element preferably extends from one end of the channel side wall (pointing towards the outlet chamber) towards or close to the return wall and towards the middle of the U-shaped channel.

Preferably, the at least one first flow-guiding part can at least partially (but not completely) cover the U-shaped channel, in particular the open side of the U-shaped channel, during design and installation. A particularly preferred embodiment provides that the at least one first flow-guiding part covers at least up to 5% or even at least up to 10% of the cross-sectional area (parallel to the transport plane) of the U-shaped channel, in particular at the open side of the U-shaped channel.

According to an advantageous embodiment, it is proposed that the pin oven further comprises at least:

at least one second flow guide device, which is designed in the intake chamber and can be used to divert the fluid.

Preferably, the at least one second flow guide device is designed and mounted such that it is ensured that the fluid flow generated in particular by the circulation device impeller can be guided to the U-shaped channel. A further preferred embodiment provides that the at least one second flow-guiding device should at least partially surround the circulation system, in particular the impeller of the circulation system.

According to an advantageous embodiment, it is proposed that the at least one second flow-guiding device is a spiral-shaped housing of the circulation system. In particular, the at least one second flow guiding device should be a helical casing of the impeller of the circulation device. A preferred embodiment is to design and/or install a screw (impeller) housing between the oven wall space and the circulation device (inlet) nozzle. Further preferred designs are: the exhaust port of the spiral (impeller) housing, from which fluid or fluid-air flow may be exhausted, is generally vertically upward and/or toward the U-shaped channel. In particular, the circulation device should be arranged below the course of the U-shaped channel.

According to a further advantageous embodiment, it is proposed that the at least one second flow-directing device is provided with at least one second flow-directing element in the region between the circulation device and the U-shaped channel. Preferably, the at least one second air guiding element has at least one, particularly preferably at least two, even at least three deflector plates or air deflectors. A further preferred embodiment provides that the at least one second air guiding element is arranged at a distance from one of the air inlet chambers, even from the inner wall of the oven on each side.

According to an advantageous embodiment, it is proposed that the at least one second flow-guiding element extends parallel to the transport plane, wherein the at least one second flow-guiding element is inclined or curved towards the transport plane. Preferably, the at least one second flow-guiding element is designed at approximately the same height as the course of the U-shaped channel.

A further preferred embodiment provides that the pin oven has a main drying space and a heating space, which in the connected state form the internal structure of the oven, and that the main drying space has a height of the main drying space of 2 to 3m, in particular between 2 and 2.6 m, even between 2 and 2.55 m. A further preferred embodiment provides that the volume of the interior of the main drying space is 15 to 100m/s, in particular between 20 and 50 cubic meters or even between 20 and 25 cubic meters.

Such a low construction height and/or such a small volume of the drying body space makes it possible, in particular, to shorten the heating time of the container in the pin oven by the fluid guidance of the first and/or second flow guide device. The lower overall height of the drying body space, in particular in combination with a smaller volume of the drying body space, has the particular advantage that: the drying body space can be put into a standard container for transportation. In particular a pin oven, having a capacity of at least 2000 or even at least 2400 containers per minute. In particular, the corresponding standard container has the following internal dimensions: length of the container: 12 m, width of the container: 2.35 m, container height: 2.69 m. Such a standard container is also known as a "40-FuB-HC container".

A preferred embodiment is one having at least one heating device which is designed and arranged to heat the fluid located inside the furnace. A preferred embodiment of the heating device is to have at least one heater which can be operated electrically and/or by means of fossil fuels. In particular, the heating device should have a burner or gas burner that burns inside the furnace.

Furthermore, an exhaust fan can be installed, which is preferably arranged in the exhaust chamber and/or connected to the exhaust chamber, taking into account the flow technology. The exhaust fan may be at least partially mounted inside the oven and/or in the pin oven. Exhaust fans may be used, among other things, to draw fluid from the exhaust chamber. The exhaust fan may form a drying space inside the oven, in particular in the working area of the drying chamber, for example, the exhaust fan may remove fluid from the oven interior, in particular carrying liquid and/or contaminants after the fluid has flowed through the U-shaped channel. In particular, condensates, water, solvents and/or even combustible fluids can be at least partially removed.

Independently of the above-mentioned solutions, in particular for improving thermal and/or current efficiency, a pin furnace with a tubular container for dry coating comprises at least:

a conveyor device with a plurality of pins, wherein each pin is at least partially elevated above a U-shaped channel and is profiled to be able to carry a tubular container;

at least one circulation device which is at least partially mounted inside the furnace and can be used to flow the fluid inside the furnace.

At least one (second) flow-guiding device, which should be arranged in the inlet chamber and can be used for deflecting the fluid.

It should be noted that the designations of "first" and "second" deflectors are specified only to distinguish one from another, and thus the "first" and/or "second" deflectors can be used independently of one another.

The features and advantageous embodiments and details of the pin oven described above can therefore also be applied to the pin oven proposed in the present case and vice versa. In this respect, reference may be made in full to the description of the features made thereon for reference. The invention and the technical environment will be explained in more detail below with reference to the drawings. It should be noted that the invention should not be limited by the illustrated embodiments. In particular, unless explicitly stated otherwise, some of the structures shown in the drawings may be extracted and combined with other components and/or other drawings and/or the description.

Drawings

FIG. 1 is a cross-sectional view of a pin furnace;

FIG. 2 is a spiral housing;

FIG. 3 is a side view of a pin oven;

FIG. 4 is a detailed view of the U-shaped channel;

FIG. 5 is a detailed view of another U-shaped channel;

fig. 6 is a detailed view of the return sidewall.

List of reference numerals: 1. drying the pin; 2. A tubular container; 3. oven interior space; 4. a transport plane; 5. an air intake chamber; 6. An exhaust chamber; 7. a U-shaped channel; 8. a transportation device; 9. a pin; 10. a circulation device; 11. a first flow guide device; 12. an open side; 13. a terminal end; 14. opening a hole; 15. a reflow sidewall; 16. an opening area; 17. a first flow guide member; 18. a second flow guide device; 19. a housing; 20. a second flow guide member; 21. a main body space for drying; 22. heating the space; 23. height of the main body space for drying; 24. a heating device; 25. a pre-drying space; 26. and (4) cooling the area.

Detailed Description

The invention is further described with reference to the following figures and examples:

in fig. 1 a cross-sectional view of a pin furnace 1 for drying a coating of at least one tubular container (not shown here) is shown. The pin oven 1 has an oven interior 3 approximately perpendicular to the conveying plane 4. The circulation of the fluid in the interior space 3 of the oven is shown by reference to the exemplary arrows in fig. 1. An inlet plenum 5 is provided upstream of the conveying plane 4 of the oven interior 3 and an outlet plenum 6 is provided downstream of the conveying plane 4. A U-shaped channel 7 is designed in the transport plane 4 in the pin kiln 1 and the open side of the U-shaped channel 7 opens into the exhaust chamber 6. furthermore, according to the illustration with reference to fig. 1, the pin kiln 1 has a conveyor device 8 with a large number of pins 9, a circulation device 10 which is arranged at least partially in the kiln interior 3, and a heating device 24 for heating the fluid in the kiln interior 3, which device can be formed, for example, by a gas burner in the kiln interior 3. In fig. 1 it is shown by way of example by means of arrows how the circulating means 10 sucks in the fluid heated by the heating means 24 and moves it inside the oven interior 3 or through the oven interior 3.

As shown in fig. 1, the pin kiln 1 has a main drying space 21 and a heating space 22, which are connected to each other to form a kiln internal space 3 (see the figure). The drying body space 21 shown in fig. 1 has a drying body space height 23.

In fig. 1, at least one second flow-guiding device 18 is shown, which is designed in the inlet chamber 5 and can be used to divert the fluid. The second air guiding device 18 has, for example, four second air guiding elements 20, which are arranged in the region between the circulation device 10 and the U-shaped channel 7. The second air guiding element 20 is formed here by an air deflector, which runs parallel to the transport plane 4 (below the drawing plane) and is deflected toward the transport plane 4.

Fig. 2 shows a spiral-shaped housing 19 of the circulation device 10, which can be used as a second flow-directing device 18 in an alternative or additive manner, as the second flow-directing part 20 shown in fig. 1.

A detailed view of the pin oven 1 is shown in figure 3. The pin kiln 1 shown here is explained by taking as an example the drying main body space 21, the heating space 22, the drying main body space 21 of the upstream pre-drying frame 25 and the drying main body space 21 downstream, and the cooling zone 26 to follow.

Fig. 4 shows a detailed view of the U-shaped channel 7 extends in the transport plane 4 and opens into the exhaust chamber in an open state. The U-shaped channel 7 is connected to the inlet chamber 5 by a perforated, partially ventilated duct wall. Also in reference to fig. 4, the flow state of the fluid is shown by arrows. As shown with reference to fig. 4, the pin 9 of the conveying device 8 (not shown here) extends at least partially into the U-shaped channel 7. In addition, the design and mounting of the pin 9 can accommodate the tubular container 2. The tubular container 2 can be guided through the U-shaped channel 7 by means of a conveying device 8.

In fig. 4, at least one flow guide device 11 is shown, which flow guide device 11 can be designed and mounted for deflecting the fluid in the region of the open side 12 of the U-shaped channel. The arrows shown in fig. 4 indicate that the first flow-guiding means 11 are designed and installed for this purpose such that the gas flow towards the open side 12 of the U-shaped channel 7 converges at the end region 13 of the container 2, into which the pin 9 is inserted, which end region faces the degassing chamber 6. . The first flow-guiding means 11 is designed here with a plurality of ventilation openings 14 which are intended to be arranged in the return wall 15 of the outlet chamber 6, while the air openings 14 are arranged only in the opening regions 16 of the return wall 15, which correspond to the containers 2. The return wall 15 is shown here in a cut view.

Fig. 5 shows a detailed view of the U-shaped channel 7, which is hereby referred to with reference numerals in common and which is hereby incorporated by reference in its entirety. According to the illustration in fig. 5, the first air guiding device 11 has two first air guiding elements 17, which are arranged in the region of the open side 12 of the U-shaped channel 7 and are connected to the U-shaped channel 7. In the present case, the first air guiding element 17 is formed by an air guiding plate. Furthermore, the first flow guiding member 17 should be designed and mounted such that it partly covers the open side 12 of the U-shaped channel 7.

Fig. 6 shows a detailed view of the return side wall 15, the first flow guiding means 11 being formed by a plurality of ventilation openings 14 in the return wall 15. By referring to fig. 6, it can be seen from a different perspective with reference to fig. 4 that the openings 14 are only provided in the opening area 16 of the return wall 15, which opening area 16 corresponds to the container 2. A side view of the return wall 15 is shown with reference to figure 6.

A pin oven for drying a coating of at least one tubular container is disclosed herein that at least partially solves problems not addressed by the prior art. In particular, the pin oven allows the container to be heated as uniformly as possible and the coating to be dried as uniformly as possible while minimizing the heating time or residence time of the container in the pin oven. Furthermore, the pin ovens can be produced as cost-effective and space-saving as possible, are easy to transport and can be operated in a resource-saving or energy-saving manner. Furthermore, the pin oven should have a higher thermal and/or current-technical efficiency than conventional pin ovens.

Claims

1. A pin baker (1), characterized in that: at least comprises the following steps:

-a furnace interior (3) in which an approximately vertically oriented transport plane (4) is designed, wherein an inlet air chamber (5) is provided upstream of the transport plane (4) and an outlet air chamber (6) is provided downstream of the transport plane (4);

-at least one U-shaped channel (7) is designed on the transport plane (4) with the open side of the U-shaped channel (7) directed towards the exhaust chamber (6);

-a conveyor (8) with a plurality of pins (9), wherein each pin (9) is at least partially insertable into the U-shaped channel (7) and is designed and made in a configuration capable of housing the tubular container (2);

-at least one circulation device (10) at least partly installed in the interior space (3) of the oven and adapted to cause a fluid flow of the interior space (3) of the oven;

-at least a first flow-guiding device (11) mounted in the region of the open side (12) of the U-shaped channel (7);

wherein the first air guiding device (11) converges the air flow towards the open side (12) of the U-shaped channel (7) at an end region (13) of the container (2) into which the pin (9) is inserted, said end region facing the air outlet chamber (6).

2. The pin toaster as claimed in claim 1, wherein: the first flow guide device (11) is a plurality of ventilation openings (14), and the ventilation openings (14) are arranged on a return wall (15) of the exhaust chamber (6).

3. The pin toaster as claimed in claim 2, wherein: the ventilation openings (14) are arranged only in an opening area (16) of the return wall (15), which opening area (16) corresponds to the container (2) on the pin (9).

4. The pin toaster as claimed in claim 1, wherein: the first air guiding device (11) has at least one first air guiding element (17), which first air guiding element (17) is arranged in the region of the open side (12) of the U-shaped channel (7) and is connected to the U-shaped channel (7).

5. The pin toaster as claimed in claim 1, wherein: at least one second flow-guiding device (18) is also included, which second flow-guiding device (18) is provided in the inlet chamber (5) and serves to divert the fluid.

6. A pin toaster according to claim 5, wherein: the at least one second flow-guiding device (18) is a spiral-shaped housing (19) of the circulation device (10).

7. A pin toaster according to claim 5 or 6, wherein: the at least one second flow guiding device (18) is a second flow guiding member (20) arranged between the circulating device (10) and the U-shaped channel (7).

8. The pin toaster as claimed in claim 7, wherein: at least one second flow-guiding element (20) extends parallel to the transport plane (4), wherein the at least one second flow-guiding element (20) is inclined or curved towards the transport plane (4).

9. The pin toaster as claimed in claim 1, wherein: the pin kiln (1) comprises a main drying space (21) and a heating space (22), wherein the main drying space (21) and the heating space (22) form the kiln inner space (3) in a connected state, and the main drying space (21) has a main drying space height (23) of 2-3 m.