Tea roasting machine

Abstract

The utility model discloses a tea leaf roasting machine, which relates to the technical field of tea leaf processing and comprises an outer cylinder, the outer cylinder is mounted on a rack and is of a cylinder structure with two open ends, and a dust discharge port is formed in the bottom wall of the outer cylinder; the drum screen is of a drum structure with openings in the two ends and is coaxially arranged in the outer drum, and the two ends of the drum screen extend to the outer side of the outer drum; the drum screen is rotationally connected into the outer barrel through a driving assembly, and a cavity is formed between the outer side wall of the drum screen and the inner side wall of the outer barrel. A plurality of heat conduction ribs are arranged on the inner wall of the drum screen in the axial direction of the drum screen. A plurality of guide vane rulers extending towards the interior of the drum screen are fixed to a port of one end of the drum screen. The hot air assembly is located on the outer side of the outer barrel, the hot air outlet end of the hot air assembly is communicated with the cavity, the drum screen and the outer barrel are arranged, tea leaves and tea dust can be separated in the rotating process of the drum screen, the tea dust can be conveniently cleaned through the dust discharging opening, and the hot air assembly and heat conduction ribs in the drum screen are jointly matched, so that the tea leaves are evenly heated, and the tea leaf quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of tea processing technology, and more specifically to a tea drying machine. Background Technology

[0002] In the tea processing industry, drying is a crucial step in tea production, directly affecting the final quality and taste of the tea. Traditional methods of drying tea rely heavily on manual stirring or the use of simple tea-frying machinery. While these methods can meet production needs to some extent, they have many shortcomings.

[0003] First, traditional tea-frying methods often fail to ensure even heating of the tea leaves. Because the tea leaves need to be constantly turned during the frying process to ensure even heating, but manual frying is not only labor-intensive, but also makes it difficult to precisely control the evenness and frequency of frying. This results in uneven heating of the tea leaves during the frying process. Some tea leaves may become burnt due to over-frying, while others may not dry completely due to insufficient heating.

[0004] Secondly, traditional tea-frying methods are relatively inefficient at drying tea. Due to the limited heat exchange efficiency between the heat source and the tea leaves, and the difficulty in precisely controlling the temperature during the frying process, the moisture in the tea leaves evaporates slowly, requiring a longer frying time to achieve the desired drying effect. This not only increases production costs but also extends the tea processing cycle.

[0005] In addition, traditional tea-frying methods also present difficulties in handling tea dust and impurities; during the frying process, the edges of the tea leaves and tender stems are easily broken, producing tea dust. If this tea dust is not cleaned up in time, it will affect the quality of the tea.

[0006] Therefore, how to provide a tea drying machine that can achieve uniform heating of tea leaves, improve drying efficiency, separate tea dust, and effectively improve tea quality is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the present invention provides a tea drying machine, which aims to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A tea drying machine, comprising:

[0010] The outer cylinder is mounted on the frame and is a cylindrical structure with openings at both ends, and a discharge port is provided on its bottom wall.

[0011] A drum screen, wherein the drum screen is a cylindrical structure with openings at both ends and coaxially arranged inside the outer cylinder, and both ends of the drum screen extend to the outside of the outer cylinder; the drum screen is rotatably connected to the inside of the outer cylinder by a drive assembly, and a cavity is formed between its outer side wall and the inner side wall of the outer cylinder; multiple heat-conducting ribs are arranged along the axial direction on the inner wall of the drum screen, and multiple guide vanes extending inward are fixed at one end of the drum screen.

[0012] A hot air assembly is located outside the outer cylinder, and its hot air outlet end is connected to the cavity.

[0013] Through the above technical solution, the present invention provides a tea drying machine. The part of the drum screen located inside the outer cylinder has mesh holes. The arrangement of the drum screen and the outer cylinder can effectively separate tea leaves and tea dust during the rotation of the drum screen. The setting of the dust discharge port facilitates the cleaning of tea dust. Through the joint cooperation of the hot air component and the heat-conducting ribs inside the drum screen, the tea leaves can be heated evenly inside the drum screen, thereby improving work efficiency and tea quality.

[0014] Preferably, the above-mentioned tea drying machine further includes an auxiliary stirring assembly, which includes a first drive motor, a rotating shaft, and stirring rods. The first drive motor is mounted on the frame and located at the end of the drum screen away from the guide vane. One end of the rotating shaft is connected to the power output shaft of the first drive motor via a coupling, and the other end extends into the drum screen. Multiple stirring rods are fixed to the outer wall of the rotating shaft. The addition of the stirring assembly further enhances the stirring effect and improves the stirring efficiency and effectiveness.

[0015] Preferably, in the above-mentioned tea drying machine, a bushing rotating seat is rotatably connected to one end of the rotating shaft located inside the drum screen, and a connecting rod is fixed between the outer wall of the bushing rotating seat and the inner wall of the drum screen. This ensures the stability of the rotating shaft, and the connecting rod does not interfere with the guide leaf ruler, thus not affecting the entry and exit of tea leaves.

[0016] Preferably, in the above-mentioned tea drying machine, the rotating shaft is fixed with multiple fan blades on the side wall outside the drum screen. When the rotating shaft rotates, it drives the fan blades to rotate, increasing the airflow inside the drum screen and helping to distribute the hot air evenly. It is necessary to ensure that the force of the wind generated by the rotating fan blades is not strong enough to blow the tea leaves out.

[0017] Preferably, in the above-mentioned tea drying machine, the hot air assembly includes a hot air furnace, an air inlet pipe, and an air volume regulator. The hot air furnace is located outside the outer cylinder, the inlet end of the air inlet pipe is connected to the outlet end of the hot air furnace, and the outlet end of the air inlet pipe passes through the outer cylinder and extends into the outer cylinder to communicate with the cavity. The air volume regulator is installed on the air inlet pipe. This provides effective hot air to the drum screen, accelerating the frying efficiency. Simultaneously, the air volume regulator allows for adjustment of the air volume to meet the hot air requirements at different stages.

[0018] Preferably, the above-mentioned tea drying machine further includes a dehumidification component, which includes a dehumidification fan and a heat exchange box. The dehumidification fan is installed on the top wall of the outer cylinder, and its inlet end extends into the outer cylinder and communicates with the cavity. The heat exchange box is located on the outside of the outer cylinder, and its inlet end is connected to the outlet end of the dehumidification fan through a connecting pipe. Its outlet end is connected to the hot air furnace through a connecting pipe. The dehumidification fan can discharge the moisture in the drum screen, improving the quality of the tea. At the same time, the heat exchange box realizes the recovery of high-temperature moisture and air preheating, improving energy utilization efficiency.

[0019] Preferably, in the above-mentioned tea drying machine, a cover plate is hinged to the discharge port. The opening and closing of the cover plate can be controlled as needed to collect and discharge the tea dust.

[0020] Preferably, in the above-mentioned tea drying machine, a vibration component is installed on the bottom wall of the outer cylinder at the end furthest from the discharge port. The vibration component further enables the rapid discharge of tea dust from the inner wall of the outer cylinder.

[0021] Preferably, in the above-mentioned tea drying machine, a tea dust collection box is arranged below the outer cylinder, and the inlet end of the tea dust collection box corresponds to the outlet.

[0022] Preferably, in the above-mentioned tea drying machine, the drive assembly includes a second drive motor, drive rollers, a transmission shaft, and driven rollers. The second drive motor is mounted on the frame and located at the end of the drum screen away from the guide vane. Two drive rollers are fixed to the frame and are arranged on the same side at both ends of the drum screen. One end of the transmission shaft is connected to the power output shaft of the second drive motor via a coupling, and the other end passes through the two drive rollers in sequence. Two driven rollers are also arranged on the same side at both ends of the drum screen away from the drive rollers. The result is simple and stable, enabling the rotation of the drum screen.

[0023] Preferably, in the above-mentioned tea drying machine, the open end of the outer cylinder 1 has an annular retaining ring extending towards its central axis. There is no interference between the annular retaining ring and the outer wall of the drum screen, that is, it will not affect the rotation of the drum screen. One end of the transmission shaft is connected to the power output shaft of the second drive motor through a coupling, and the other end passes through the drive roller and the annular retaining ring in sequence, and extends into the cavity, and extends out of the annular retaining ring and the drive roller at the other end of the outer cylinder.

[0024] Preferably, in the above-mentioned tea drying machine, the drive assembly further includes positioning rollers. The number of positioning rollers is four, arranged symmetrically in pairs below the drum screen and abutting against the bottom of the drum screen. This further enhances the stability of the drum screen's rotation and effectively prevents the drum screen from shifting during rotation.

[0025] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a tea drying machine, which has the following beneficial effects:

[0026] 1. The drum screen of this utility model can effectively separate tea leaves from tea dust. Through the rotation of the drum screen and the heat-conducting ribs on the inner wall, the tea leaves tumble continuously inside the drum screen and come into full contact with the hot air provided by the hot air component, so as to achieve rapid and uniform drying of the tea leaves. The air volume regulator in the hot air component can adjust the hot air volume according to the type of tea leaves and the drying requirements, which improves the adaptability and flexibility of the equipment.

[0027] 2. By setting up an auxiliary stirring component, the first drive motor drives the rotating shaft and stirring rod to rotate, which further promotes the tumbling and turning of tea leaves in the drum screen, enhances the drying effect, and avoids local overheating or scorching of the tea leaves.

[0028] 3. This utility model uses a dehumidifying fan to remove the moisture generated during the drying process, and recovers some of the heat energy through a heat exchange box, which is then returned to the hot air furnace for reuse, thereby improving energy utilization efficiency and reducing energy consumption.

[0029] 4. This utility model integrates multiple functions such as frying, stirring, dehumidification, and heat recovery, which greatly improves the efficiency and quality of tea frying and reduces labor costs and labor intensity. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 The attached figure is a structural schematic diagram of the tea drying machine provided by this utility model;

[0032] Figure 2 The attached figure is a structural schematic diagram of the auxiliary stir-frying component provided by this utility model;

[0033] Figure 3 The attached figure is a structural schematic diagram of one end of the guide vane ruler of the drum screen provided by this utility model;

[0034] Figure 4 The attached figure is a structural schematic diagram of one end of the second drive motor of the drum screen provided by this utility model;

[0035] Figure 5 The attached figure is a schematic diagram of the tea drying machine provided by this utility model from another angle.

[0036] in:

[0037] 1-Outer cylinder;

[0038] 11-Discharge outlet; 12-Vibrator;

[0039] 2-Rack;

[0040] 3-Drum screen;

[0041] 31-Heat-conducting rib; 32-Guide blade ruler; 33-Electric heating wire;

[0042] 4-Driver components;

[0043] 41-Second drive motor; 42-Drive roller; 43-Drive shaft; 44-Driven roller; 45-Positioning roller;

[0044] 5-Hot air assembly;

[0045] 51-Hot blast furnace; 52-Air inlet pipe;

[0046] 6-Auxiliary stir-frying component;

[0047] 61-First drive motor; 62-Rotating shaft; 621-Shaft sleeve rotating seat; 622-Connecting rod; 623-Fan blade; 63-Stirring rod;

[0048] 7-Dehumidification Components

[0049] 71-Dehumidification fan; 72-Heat exchange box. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] See appendix Figure 1 This utility model discloses a tea drying machine, comprising:

[0052] Outer cylinder 1 is mounted on frame 2. Outer cylinder 1 is a cylindrical structure with openings at both ends, and a discharge port 11 is provided on its bottom wall.

[0053] The drum screen 3 is a cylindrical structure with openings at both ends and is coaxially arranged inside the outer cylinder 1. Both ends of the drum screen 3 extend to the outside of the outer cylinder 1. The drum screen 3 is rotatably connected to the inside of the outer cylinder 1 through the drive assembly 4, and a cavity is formed between its outer side wall and the inner side wall of the outer cylinder 1. Multiple heat-conducting ribs 31 are arranged along its axial direction on the inner wall of the drum screen 3, and multiple guide vane scales 32 extending into its interior are fixed at one end of the drum screen 3.

[0054] Hot air assembly 5 is located outside the outer cylinder 1, and its hot air outlet end is connected to the cavity.

[0055] To further optimize the above technical solution, an auxiliary stir-frying component 6 is also included. The auxiliary stir-frying component 6 includes a first drive motor 61, a rotating shaft 62, and stir-frying rods 63. The first drive motor 61 is mounted on the frame 2 and located at the end of the drum screen 3 away from the guide blade 32. One end of the rotating shaft 62 is connected to the power output shaft of the first drive motor 61 through a coupling, and the other end extends into the inside of the drum screen 3. There are multiple stir-frying rods 63, which are fixed on the outer wall of the rotating shaft 62.

[0056] To further optimize the above technical solution, a bushing rotating seat 621 is rotatably connected to one end of the rotating shaft 62 located inside the drum screen 3, and a connecting rod 622 is fixed between the outer wall of the bushing rotating seat 621 and the inner wall of the drum screen 3.

[0057] To further optimize the above technical solution, multiple fan blades 623 are fixed on the side wall of the rotating shaft 62 located on the outside of the drum screen 3.

[0058] To further optimize the above technical solution, the hot air assembly 5 includes a hot air furnace 51, an air inlet pipe 52, and an air volume regulator; the hot air furnace 51 is mounted on the frame 2 and located outside the outer cylinder 1; the inlet end of the air inlet pipe 52 is connected to the outlet end of the hot air furnace 51; the outlet end of the air inlet pipe 52 passes through the outer cylinder 1 and extends into the outer cylinder 1 to communicate with the cavity; the air volume regulator is mounted on the air inlet pipe 52.

[0059] To further optimize the above technical solution, a conical cover is connected to the port of the air inlet pipe 52 extending into the cavity. The diameter of the end of the conical cover away from the air inlet pipe 52 is larger than the diameter of the end connected to the air inlet pipe 52, so as to facilitate the dispersion of hot air into the drum screen 3.

[0060] To further optimize the above technical solution, a dehumidification component 7 is also included. The dehumidification component 7 includes a dehumidification fan 71 and a heat exchange box 72. The dehumidification fan 71 is installed on the top wall of the outer cylinder 1, and its inlet end extends into the outer cylinder 1 and communicates with the cavity. The heat exchange box 72 is located on the outside of the outer cylinder 1. The inlet end of the heat exchange box 72 is connected to the outlet end of the dehumidification fan 71 through a connecting pipe, and its outlet end is connected to the hot air furnace 51 through a connecting pipe.

[0061] To further optimize the above technical solution, the heat exchange box 72 is used to preheat the high-temperature and humid air entering it, and the preheated air can be discharged into the hot air furnace 51 to realize energy utilization.

[0062] To further optimize the above technical solution, a humidity sensor is installed at the outlet of the dehumidifying fan 71 to monitor the humidity of the discharged moisture in real time. Based on the monitoring results, the speed of the dehumidifying fan or the heating amount of the hot air component 5 is automatically adjusted to control the humidity during the drying process and ensure the stability of the tea drying quality.

[0063] To further optimize the above technical solution, a cover plate (not shown in the figure) is hinged at the discharge outlet 11.

[0064] To further optimize the above technical solution, the cover plate is controlled to open and close by a transmission mechanism. The transmission mechanism can be a cylinder or an electric push rod. The cylinder or electric push rod can be mounted on the frame 2 by a bracket, and the working end of the cylinder or electric push rod is connected to the cover plate. By controlling the retraction of the working end of the cylinder or electric push rod, the opening and closing of the cover plate can be realized.

[0065] To further optimize the above technical solution, a vibrator 12 is installed on the bottom wall of the outer cylinder 1 at the end furthest from the discharge port 11. The structure and working principle of the vibrator 12 are the same as those in the prior art, and will not be described again here.

[0066] To further optimize the above technical solution, the number of vibrators 12 can be two, which are respectively installed on the bottom wall of the outer cylinder 1 and located on both sides of the discharge port 11.

[0067] To further optimize the above technical solution, a tea dust collection box is arranged below the outer cylinder 1. The inlet end of the tea dust collection box corresponds to the outlet 11, and the diameter of its inlet end is larger than the diameter of the outlet 11.

[0068] To further optimize the above technical solution, the drive assembly 4 includes a second drive motor 41, drive rollers 42, a transmission shaft 43, and driven rollers 44. The second drive motor 41 is mounted on the frame 2 and located at the end of the drum screen 3 away from the guide vane 32. The drive rollers 42 are fixed on the frame 2, and there are two of them. The two drive rollers 42 are arranged on the same side at both ends of the drum screen 3. One end of the transmission shaft 43 is connected to the power output shaft of the second drive motor 41 through a coupling, and the other end passes through the two drive rollers 42 in sequence. There are two driven rollers 44, and the two driven rollers 44 are arranged on the same side at both ends of the drum screen 3 away from the drive rollers 42.

[0069] To further optimize the above technical solution, the drive assembly 4 also includes positioning rollers (not shown in the figure). There are four positioning rollers, which are symmetrically arranged in pairs below the drum screen 3 and abut against the bottom of the drum screen 3.

[0070] To further optimize the above technical solution, the drive component 4 is not limited to the structural connection method in this embodiment, but can also use other structural connection methods as long as they can drive the drum screen 3 to rotate.

[0071] To further optimize the above technical solution, the drum screen 3 has a downwardly inclined guide plate installed at one end of the guide blade 32, and a conveyor belt is located below the guide plate to facilitate the removal and transportation of the dried tea leaves to the next process.

[0072] To further optimize the above technical solution, an electric heating wire 33 is also wound around the outer wall of the drum screen 3 to further enhance the heat conduction during the rotation of the drum screen 3.

[0073] To further optimize the above technical solution, a control box is also included. The control terminal of the control box controls the operation of the first drive motor 61, the second drive motor 41, the hot air assembly 5, the dehumidification assembly 7, the electric heating wire 33, the transmission mechanism (cylinder or electric push rod), and the vibrator 12, and can adjust their control parameters (air volume, speed, temperature regulation, etc.) as needed.

[0074] The embodiments of this utility model are as follows:

[0075] The end of the drum screen 3 furthest from the first drive motor 61 is the inlet and outlet. Tea leaves to be dried are placed inside the drum screen 3. The mesh size of the drum screen 3 is smaller than the diameter of the tea leaves. The control box controls the second drive motor 41 to drive the drive roller 42, causing the drum screen 3 to rotate. Heat is supplied to the cavity through the hot air furnace 51. Hot air enters the drum screen 3. During the rotation of the drum screen 3, the heat-conducting ribs 31 inside stir-fry the tea leaves. After the drum screen 3 has rotated for a certain period, the control box can control the first drive motor 61 to drive the rotating shaft 62, which in turn drives the stirring rod 6. The rotation of the drum screen 3 further facilitates the stirring and frying of the tea leaves. At the same time, the fan blades 623 on the rotating shaft 62 increase the airflow inside the drum screen 3, which helps to distribute the hot air evenly. (Of course, the rotating shaft 62 can also be driven to rotate at the same time as the drum screen 3 is driven by the control box, and the rotation time of the rotating shaft 62 can be set.) Based on the monitoring results of the humidity sensor at the outlet end of the dehumidifying fan 71, the speed of the dehumidifying fan 71 or the heating amount of the hot air component 5 is automatically turned on and adjusted in real time to control the humidity during the frying process and ensure the stability of the tea drying quality.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tea drying machine, characterized in that, include: Outer cylinder (1), the outer cylinder (1) is mounted on the frame (2), the outer cylinder (1) is a cylindrical structure with openings at both ends, and an outlet (11) is provided on its bottom wall; A drum screen (3) is a cylindrical structure with openings at both ends and is coaxially arranged inside the outer cylinder (1). Both ends of the drum screen (3) extend to the outside of the outer cylinder (1). The drum screen (3) is rotatably connected to the inside of the outer cylinder (1) by a drive assembly (4), and a cavity is formed between its outer side wall and the inner side wall of the outer cylinder (1). Multiple heat-conducting ribs (31) are arranged on the inner wall of the drum screen (3) along its axial direction. Multiple guide vane rulers (32) extending into its interior are fixed at one end of the drum screen (3). Hot air assembly (5) is located outside the outer cylinder (1) and its hot air outlet end is connected to the cavity.

2. The tea drying machine according to claim 1, characterized in that, It also includes an auxiliary stir-frying component (6), which includes a first drive motor (61), a rotating shaft (62), and stir-frying rods (63). The first drive motor (61) is mounted on the frame (2) and located at the end of the drum screen (3) away from the guide vane (32). One end of the rotating shaft (62) is connected to the power output shaft of the first drive motor (61) through a coupling, and the other end extends into the inside of the drum screen (3). There are multiple stir-frying rods (63), and multiple stir-frying rods (63) are fixed on the outer wall of the rotating shaft (62).

3. The tea drying machine according to claim 2, characterized in that, The end of the rotating shaft (62) located inside the drum screen (3) is rotatably connected to a bushing rotating seat (621), and a connecting rod (622) is fixed between the outer wall of the bushing rotating seat (621) and the inner wall of the drum screen (3).

4. A tea drying machine according to claim 1, characterized in that, The hot air assembly (5) includes a hot air furnace (51), an air inlet pipe (52), and an air volume regulator; the hot air furnace (51) is located outside the outer cylinder (1), the inlet end of the air inlet pipe (52) is connected to the outlet end of the hot air furnace (51), the outlet end of the air inlet pipe (52) passes through the outer cylinder (1) and extends into the outer cylinder (1) to communicate with the cavity; the air volume regulator is installed on the air inlet pipe (52).

5. A tea drying machine according to claim 4, characterized in that, It also includes a dehumidification assembly (7), which includes a dehumidification fan (71) and a heat exchange box (72). The dehumidification fan (71) is installed on the top wall of the outer cylinder (1), and its inlet end extends into the outer cylinder (1) and communicates with the cavity. The heat exchange box (72) is located outside the outer cylinder (1). The inlet end of the heat exchange box (72) is connected to the outlet end of the dehumidification fan (71) through a connecting pipe, and its outlet end is connected to the hot air furnace (51) through a connecting pipe.

6. A tea drying machine according to claim 1, characterized in that, A cover plate is hinged at the outlet (11).

7. A tea drying machine according to claim 1, characterized in that, A vibrator (12) is installed on the bottom wall of the outer cylinder (1) at the end away from the discharge port (11).

8. A tea drying machine according to claim 1, characterized in that, A tea dust collection box is arranged below the outer cylinder (1), and the inlet end of the tea dust collection box corresponds to the outlet (11).

9. A tea drying machine according to claim 1, characterized in that, The drive assembly (4) includes a second drive motor (41), drive rollers (42), a transmission shaft (43), and driven rollers (44). The second drive motor (41) is mounted on the frame (2) and located at the end of the drum screen (3) away from the guide vane (32). The drive rollers (42) are fixed on the frame (2), and there are two of them. The two drive rollers (42) are arranged on the same side at both ends of the drum screen (3). One end of the transmission shaft (43) is connected to the power output shaft of the second drive motor (41) through a coupling, and the other end passes through the two drive rollers (42) in sequence. There are two driven rollers (44), and the two driven rollers (44) are arranged on the same side at both ends of the drum screen (3) away from the drive rollers (42).

10. A tea drying machine according to claim 9, characterized in that, The drive assembly (4) also includes positioning rollers, and the number of positioning rollers is four. The four positioning rollers are arranged symmetrically in pairs below the drum screen (3) and abut against the bottom of the drum screen (3).

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