WO2021027698A1

WO2021027698A1 - Rotating device

Info

Publication number: WO2021027698A1
Application number: PCT/CN2020/107634
Authority: WO
Inventors: 江艳存; 王贵山
Original assignee: 招远市汇潮新能源科技有限公司
Priority date: 2019-08-14
Filing date: 2020-08-07
Publication date: 2021-02-18
Also published as: CN112391178A

Abstract

Disclosed in the present application is a rotating device, comprising a drum and further comprising a carbon stripping apparatus provided in the drum. As the drum rotates, the carbon stripping apparatus touches carbon generated by surface cracking of a solid organic matter to strip off the carbon. During operation, as the drum rotates, the solid organic matter tumbles and moves in the drum, the solid organic matter is heated to undergo a cracking reaction, carbon is firstly generated on the surface of the solid organic matter, and by means of the rotation of the drum, the carbon stripping apparatus touches the carbon on the surface of the solid organic matter, thereby stripping off the carbon from the surface of the solid organic matter and exposing the part inside the solid organic matter that has not been cracked. The cracking continues, and the carbon generated following cracking continues to be stripped off by the carbon stripping apparatus, thereby preventing the carbon from being wrapped on the surface of the solid organic matter, which would hinder the cracking reaction, speeding up the cracking reaction, and improving the cracking efficiency of the organic matter.

Description

A rotating equipment

This application claims the priority of a Chinese patent filed with the Chinese Patent Office on August 14, 2019, the application number is 201910749199.0, and the invention title is "a kind of rotary device", the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the technical field of mechanical equipment, in particular to a rotary equipment.

Background technique

Rotary equipment usually includes a rotating drum. The material in the drum slides and rolls along the inner wall of the drum as the drum rotates. Taking the cracking of solid organic matter as an example, the drum heats the solid organic matter and cracks the solid organic matter to form Products such as charcoal, pyrolysis gas or pyrolysis oil. In actual use, it is found that the heating and cracking of solid organic matter takes a long time and the cracking efficiency is low.

In summary, how to solve the problem of low efficiency of pyrolysis of solid organic matter has become an urgent problem for those skilled in the art.

Summary of the invention

In view of this, the purpose of the present invention is to provide a rotary device to improve the efficiency of cracking solid organic matter.

To achieve the above objective, the present invention provides the following technical solutions:

A rotary device includes a roller, and also includes a carbon stripping device arranged in the roller. With the rotation of the roller, the carbon stripping device touches the carbon generated by the cracking of the solid organic surface to strip the carbon.

Preferably, in the above-mentioned rotary equipment, the carbon peeling device is a swinging member suspended in the drum and/or a protrusion provided on the inner wall of the drum, and the swinging member and the protrusion are used for Collision with the surface of solid organic matter.

Preferably, in the above-mentioned revolving device, the swinging member is any one or a combination of a chain, a strip, and a rope.

Preferably, in the above-mentioned revolving device, the oscillating member is plural and arranged along the circumferential direction and the axial direction of the drum.

Preferably, in the above-mentioned revolving device, at least one point of the chain and the rope is suspended in the drum.

Preferably, in the above-mentioned turning device, at least one swinging member is hung on one suspension point of the drum.

Preferably, in the above-mentioned rotary device, it further includes one or more sets of spiral bodies arranged in the drum, the spiral bodies spirally extending along the axial direction of the drum, and the side walls of the spiral body are The cylinder wall forms a spiral material channel, and the carbon stripping device is arranged on the wall surface of the spiral material channel.

Preferably, in the above-mentioned rotary equipment, when the carbon stripping device is a swinging piece, it is respectively suspended and fixed on two adjacent swinging pieces on the two side walls of the spiral material channel, one of which is The suspension point of the oscillating member is located at the position where the spiral material channel is close to the inner wall of the drum, and the suspension point of the other oscillating member is located at the position of the spiral material channel away from the inner wall of the drum. The circumferential direction is staggered, and two adjacent oscillating members overlap during the oscillating process.

Preferably, in the above-mentioned turning device, the protrusion is arranged on the wall surface of the spiral material passage.

Preferably, in the above-mentioned revolving equipment, it further includes a heating cylinder that is sealed and sheathed on the outer circumference of the drum, and the drum rotates relative to the fixed heating cylinder; the spiral body is provided with a gas communication cavity, so The gas communication cavity is in communication with the heating cylinder, and is used for introducing the heating gas of the heating cylinder into the gas communication cavity, and the outer wall of the spiral body is used for heat transfer with the material in the drum.

Preferably, in the above-mentioned rotating equipment, the spiral body is an annular spiral body, and there is a radial distance between the inner ring of the annular spiral body and the axis of the drum.

Compared with the prior art, the beneficial effects of the present invention are:

In the rotary equipment provided by the present invention, the drum is provided with a carbon stripping device. With the rotation of the drum, the carbon stripping device touches the carbon generated by the surface cracking of the solid organic matter to strip off the carbon on the surface of the solid organic matter. When working, with the rotation of the drum, the solid organic material rolls and moves in the drum, and the solid organic material is heated to undergo a cracking reaction. The first carbon is generated on the surface of the solid organic matter. Through the rotation of the drum, the carbon stripping device and the carbon on the surface of the solid organic matter are generated. Touch to peel off the carbon on the surface of the solid organic matter, exposing the part of the solid organic matter that has not been cracked, and continue the cracking. The carbon generated after the cracking will continue to be stripped off by the carbon stripping device, thus avoiding the carbon from being wrapped on the surface of the solid organic matter. It hinders the cracking reaction, speeds up the cracking reaction, and improves the efficiency of organic matter cracking.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work.

Figure 1 is a schematic cross-sectional view of a rotary device provided by an embodiment of the present invention;

2 is a schematic structural diagram of a cross-section of a second type of rotating equipment provided by an embodiment of the present invention;

Fig. 3 is a schematic front view of a third type of turning device provided by an embodiment of the present invention;

4 is a schematic cross-sectional view of a fourth type of rotation equipment provided by an embodiment of the present invention;

Fig. 5 is a schematic cross-sectional view of a fifth type of rotary equipment provided by an embodiment of the present invention;

6 is a schematic diagram of the axial cross-sectional structure of a sixth type of rotary device provided by an embodiment of the present invention;

Fig. 7 is a schematic view of the axial cross-sectional structure of a seventh type of rotary device provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a bar of a rotary device according to an embodiment of the present invention;

Figure 9 is a schematic diagram of a roller structure of a rotary device provided by an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of a heating cylinder of a rotary device according to an embodiment of the present invention.

Among them, 1 is a roller, 2 is a carbon stripping device, 21 is a swinging member, 211 is a chain, 212 is a bar, 22 is a protrusion, 3 is a spiral body, 4 is a connecting hole, 5 is a spiral material channel, 6 Is the heating cylinder, 61 is the gas inlet and outlet, 62 is the observation port, 63 is the ignition port, and 64 is the waste discharge port.

detailed description

The core of the present invention is to provide a rotary device, which improves the heat transfer efficiency.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Figures 1-7, an embodiment of the present invention provides a rotary device, including a drum 1 and a carbon stripping device 2, wherein the carbon stripping device 2 is provided in the drum 1. As the drum 1 rotates, the carbon stripping device 2 Contact with the carbon generated by the cracking of the solid organic surface in the drum 1 to peel off the carbon.

The applicant of this application found that the reason for the low efficiency of pyrolysis of solid organic matter is that the carbon generated by the surface pyrolysis of solid organic matter has been wrapped on the surface of the solid organic matter, causing the uncracked part of the solid organic matter to not be heated well, thereby affecting The speed of the cracking reaction. When the rotary device in this embodiment is working, as the drum 1 rotates, the solid organic material rolls and moves in the drum 1, and the solid organic material is heated to undergo a cracking reaction. The carbon is first generated on the surface of the solid organic material and passes through the drum 1 Turning, the carbon stripping device 2 touches the carbon on the surface of the solid organic matter, thereby stripping off the carbon on the surface of the solid organic matter, exposing the part of the solid organic matter that has not been cracked, and continuing the cracking, and the carbon generated after the cracking is continued by the carbon stripping device 2 It is stripped off, thereby avoiding the carbon from being wrapped on the surface of the solid organic matter, so that the inside of the solid organic matter is quickly heated, speeding up the cracking reaction, and improving the efficiency of organic cracking.

Further, in this embodiment, the carbon stripping device 2 is a swinging member 21 suspended in the drum 1 and/or protrusions 22 provided on the inner wall of the drum 1. The swinging members 21 and the protrusions 22 are used to interact with solid organic matter. Surface collision. As shown in Figure 1, Figure 3-8, the swing member 21 is suspended in the drum 1. The swing member 21 swings in the drum 1 with the rotation of the drum 1, and the swing member 21 rolls with the drum 1 during the swing process. When the solid organic matter collides with the solid organic matter, the oscillating member 21 collides the carbon generated by the surface cracking of the solid organic matter. As shown in Figures 2, 3 and 6, the protrusions 22 are arranged on the inner wall of the drum 1. During the rotation of the drum 1, the solid organic material rolls down along the inner wall of the drum 1. The surface collides, thereby colliding the carbon generated by the surface cracking of solid organic matter. Compared with the natural tumbling process of the solid organic matter in the drum 1, the swinging member 21 and the protrusion 22 greatly increase the probability of collision and shedding of the carbon on the surface of the solid organic matter, thereby improving the efficiency of pyrolysis of the solid organic matter.

Specifically, this embodiment provides a specific swing member 21, which is any one or a combination of chain 211, strip 212, rope, etc., that is, the drum 1 can Only one of chain 211, bar 212, rope, etc. is provided, or any two of chain 211, bar 212, rope, etc. are provided in drum 1, or chain-shaped Objects 211, strips 212, ropes, etc. are all arranged in the drum 1. As shown in Figure 1, Figure 3-7, the chain 211 is a chain structure, as shown in Figure 8, the strip 212 is a long structure; the rope is a metal cable structure, as long as it can be hung in the drum 1. What is necessary is to swing, and the swing member 21 is not limited to the structure listed in this embodiment.

Further, in this embodiment, there are a plurality of oscillating members 21, which are arranged along the circumferential and axial directions of the drum 1, preferably evenly distributed, so that the solid organic matter in the drum 1 exits from the feeding end of the drum 1 Charcoal stripping can be carried out during the entire movement of the material end to further improve the cracking efficiency. In addition, the two adjacent oscillating members 21 can also play the role of rubbing solid organic matter during the oscillating process, which further improves the carbon peeling effect.

In this embodiment, at least one point of the chain 211 and the rope is hung in the drum 1, that is, one or both ends of the chain 211 and the rope or any point or several points thereon are hung on the drum 1. Inside. If the chain 211 and the rope are suspended in the drum 1 at multiple points, in order to ensure the carbon peeling effect, the length of the chain 211 and the rope is increased.

In this embodiment, at least one swing member 21 is hung on a suspension point of the drum 1, that is, one or more swing members 21 are hung at a point in the drum 1. If multiple swing members 21 are hung at a point, a If the swing member 21 is set, the swing range of the swing member 21 at the suspension point is increased, which improves the carbon stripping effect at this position. The setting position of a group of swing members 21 is selected according to the process requirements, or the swing member is determined according to the process requirements 21 suspension density and spacing.

In this embodiment, the protrusions 22 cover the inner wall of the drum 1, and the protrusions 22 protrude into the drum 1. The shape of the protrusions 22 can be cylindrical, cone, triangular, mushroom, etc., as long as it can treat solid organic matter. The carbon on the surface may be peeled off, and it is not limited to the shapes listed in this embodiment.

As shown in Figures 4-7, in this embodiment, the rotating equipment further includes one or more sets of spiral bodies 3 arranged in the drum 1. The spiral bodies 3 spirally extend along the axial direction of the drum 1, and the side walls of the spiral body 3 are connected to The cylinder wall of the drum 1 forms a spiral material channel 5, and the carbon stripping device 2 is arranged on the wall surface of the spiral material channel 5. After being arranged in this way, the spiral body 3 can make full use of the space in the drum 1, greatly increase the heat transfer area in the drum 1, and specify the movement path of the solid organic matter. When working, after the material enters the drum 1 from the feeding end of the drum 1, as the drum 1 rotates, the material gradually moves in the spiral material channel 5 from the feeding end of the drum 1 to the discharge end, and the material is rotated by the spiral body 3 drives to move backward automatically. Therefore, the drum 1 can be placed horizontally, and it is not necessary to set the feed end higher than the discharge end obliquely. When the material moves in the spiral material channel 5, the material is always in contact with the side wall of the spiral body 3 and the cylinder wall of the drum 1 for heat transfer, and the running path of the material is prolonged, and the residence time of the material in the drum 1 is increased, so that the material Sufficient heating further improves the heat transfer efficiency and is more conducive to the cracking reaction. At the same time, because the material moves in the spiral material channel 5, the carbon stripping device 2 is installed on the wall of the spiral material channel 5 to make the carbon stripped. The device 2 collides with the solid organic matter more concentratedly, thereby further improving the carbon stripping effect.

As shown in Figures 6 and 7, further, in this embodiment, when the swinging member 21 is suspended on the spiral material channel 5, preferably, it is respectively suspended and fixed on two adjacent side walls of the spiral material channel 5. Among the two oscillating members 21, the suspension point of one oscillating member 21 is located at the position of the spiral material channel 5 close to the inner wall of the drum 1, and the suspension point of the other oscillating member 21 is located at the position of the spiral material channel 5 away from the inner wall of the drum 1, and adjacent The two swing members 21 are staggered in the circumferential direction, and two adjacent swing members 21 overlap during the swing process. In the actual operation process, when the drum 1 rotates to a certain position, the two adjacent oscillating members 21 on the two side walls of the spiral material channel 5 will swing in opposite directions, thereby realizing the intersection of the two oscillating members 21. The overlapping and overlapping oscillating member 21 rubs the solid organic matter sandwiched therein, similar to the rubbing action of two hands, which is more conducive to the peeling of the carbon on the surface of the solid organic matter.

Of course, the oscillating member 21 can also be arranged at any position in the spiral material channel 5, but the kneading effect is not as good as the cases listed in this embodiment.

Similarly, the protrusion 22 can also be arranged at any position on the wall surface of the spiral material channel 5, such as on the bottom surface or side wall of the spiral material channel 5, and can also concentrate the carbon stripping of solid organic matter.

Further, in this embodiment, the rotating equipment further includes a heating cylinder 6 sealed and sleeved on the outer circumference of the drum 1, and the drum 1 rotates relative to the fixed heating cylinder 6; the spiral body 3 is provided with a gas communication cavity, and the gas communication cavity It communicates with the heating cylinder 6 and is used to introduce the heating gas of the heating cylinder 6 into the gas communication cavity. The outer wall of the spiral body 3 is used to transfer heat with the material in the drum 1.

When working, the material enters the drum 1. As the drum 1 rotates, in order to ensure the cracking effect, the drum 1 rotates slowly. The material slides and moves along the drum wall in the drum 1. During this process, the heat in the heating drum 6 passes through the drum 1 The cylinder wall is transferred to the drum 1, and the material contacts the cylinder wall to transfer heat during the sliding process of the drum 1. At the same time, the heating gas of the heating cylinder 6 is introduced into the gas communication cavity, and the material is transferred through the contact between the body wall of the spiral body 3 and the material. Heat, and the heat is radiated into the drum 1 through the body wall of the spiral body 3. Compared with the existing material that only uses the barrel wall of the drum 1 to heat the material, the spiral body 3 provided with a gas communication cavity greatly increases The heat transfer area inside the drum 1 improves the heat transfer efficiency and heat energy utilization rate, is more conducive to the rapid progress of the cracking reaction, and saves the reaction time.

In this embodiment, the gas communication cavity of the spiral body 3 and the heating cylinder 6 maintain gas communication through a communication hole 4 opened in the cylinder wall of the drum 1. The communicating hole 4 can allow the heating gas in the heating cylinder 6 to enter the gas communicating cavity, and minimize or avoid the solid or liquid material in the heating cylinder entering the gas communicating cavity through the communicating hole 4. Because the heating cylinder is fixedly arranged, the solid Or liquid materials usually stay at the bottom of the heating cylinder and cannot easily enter the communicating hole 4, while the heating gas in the heating cylinder 6 can diffuse and flow through the communicating hole 4 into the gas communicating cavity, thereby further ensuring that the heating gas is in the gas communicating cavity. Better circulation inside for heat transfer.

Of course, this embodiment does not limit the shape, size and number of the communicating holes 4. The communicating holes 4 can be of any shape, such as circular, rectangular, elliptical, quincunx, etc., as long as it facilitates the passage of gas. The size of is determined according to the heating demand. If the heating demand is large, a larger communicating hole 4 can be provided to ensure sufficient circulation of heating gas. On the contrary, a smaller communicating hole 4 can be provided. The number of communicating holes 4 is also set according to the heating demand. The larger the number of communicating holes 4, the smoother the circulation of the heating gas in the gas communication cavity and the faster the heating speed. Otherwise, the slower the heating speed, but at the same time, ensure that Avoid solid and liquid materials in the heating cylinder from entering the gas communication cavity.

As shown in FIG. 9, further, in this embodiment, a plurality of communication holes 4 on the drum 1 are arranged in a spiral direction. If a communicating hole 4 is provided, the heating gas with a certain pressure in the heating cylinder 6 enters the gas communicating cavity through the communicating hole 4. In order to fill the gas communicating cavity with the heating gas, a communicating hole 4 is provided at one end of the spiral body, The heating gas gradually fills the entire cavity from one end of the gas communication cavity. The communication hole 4 is preferably arranged at the end of the gas communication cavity near the discharge end, so that the flow direction of the heating gas is opposite to the direction of material movement to further improve the heat transfer efficiency. If a plurality of communicating holes 4 are provided, the plurality of communicating holes 4 are arranged along the spiral direction of the spiral body. Preferably, the plurality of communicating holes 4 are evenly distributed to further improve the uniformity of gas heat transfer.

Further, in this embodiment, the spiral body 3 is an annular spiral body, and there is a radial distance between the inner ring of the annular spiral body and the axis of the drum 1. With this arrangement, the central part of the annular spiral body forms a hollow area penetrating the axial direction of the drum 1, and the gas generated by cracking in the drum 1 can circulate through the hollow area more smoothly.

Of course, the spiral body 3 may not have a hollow area, and the gas generated by cracking in the drum 1 can also be spirally transported in the spiral material channel 5, but the gas transport path is longer.

As an optimization, in this embodiment, the difference between the outer ring diameter and the inner ring diameter of the toroidal spiral is greater than 5cm, and the difference between the outer ring diameter and the inner ring diameter of the toroidal spiral is determined according to the heating requirements and the gas delivery requirements in the drum 1. . The determination of the difference value needs to ensure the temperature difference between the heating cylinder 6 and the drum 1 so that the material can be fully cracked while avoiding rapid coking.

As an optimization, in this embodiment, the width between the two side walls of the spiral body 3 is 1cm-100cm, and the width determines the size of the gas communication cavity inside the spiral body 3, which in turn determines the heating capacity and the heat dissipation area. Size, and to ensure the convection and turbulence of the hot air flow. More preferably, the width between the two side walls is about 50 cm.

In this embodiment, the pitch of the spiral body 3 is a constant pitch or a variable pitch, and the pitch is greater than 1 cm. The pitch form and pitch size are determined according to the temperature gradient and carbonization requirements of different axial sections in the drum 1.

As shown in Fig. 10, the heating cylinder 6 is optimized. In this embodiment, the heating cylinder 6 is a combustion cylinder, which is used to burn energy to generate hot gas. Specifically, an observation port 62, an ignition port 63, a gas inlet and outlet 61, and a waste outlet 64 are provided on the barrel of the combustion cylinder. The combustion cylinder is used to burn energy materials, such as liquid energy materials, solid energy materials, etc. The heated gas generated enters the gas communication cavity through the communication hole 4 on the cylinder wall of the drum 1, and the remaining waste after combustion passes through the waste outlet 64 Discharge the combustion tube. The gas inlet and outlet 61 are used to discharge the gas in the combustion cylinder and to enter the outside gas. The ignition port 63 is used to ignite the energy substance in the combustion cylinder. The observation port 62 is used to observe the combustion situation in the combustion cylinder.

Of course, in addition to using a combustion cylinder for the heating cylinder 6, an electric heating device can also be provided in the heating cylinder 6 to heat the gas in the heating cylinder 6, and the heated gas enters the gas communication cavity. Or the heating cylinder 6 is in communication with an external hot gas source for passing hot gas into the heating cylinder 6. As long as it can be realized that the gas in the heating cylinder 6 is heating gas and can be passed into the gas communication cavity for heat transfer, it is not limited to the heating cylinder form listed in the embodiment of the present application.

In addition to heating the drum 1 through the heating drum 6, for the drum 1 that does not use a gas communication cavity, a heating device, such as an electric heating device, can also be directly arranged outside the drum 1.

The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A rotary equipment, comprising a roller (1), characterized in that it also includes a carbon stripping device (2) arranged in the roller (1), and with the rotation of the roller (1), the carbon stripping device (2) It comes into contact with the carbon generated by the surface cracking of solid organic matter to peel off the carbon.
The rotary equipment according to claim 1, characterized in that the carbon stripping device (2) is a swinging member (21) suspended in the drum (1) and/or arranged on the drum (1) The protrusion (22) of the inner wall, the swing member (21) and the protrusion (22) are used to collide with the surface of the solid organic matter.
The rotary device according to claim 2, wherein the swing member (21) is any one or a combination of a chain (211), a strip (212), and a rope.
The revolving equipment according to claim 2, characterized in that the oscillating member (21) is multiple and arranged along the circumferential and axial directions of the drum (1).
The rotary device according to claim 3, characterized in that at least one point of the chain (211) and the rope (212) is suspended in the drum (1).
The rotating equipment according to claim 3, characterized in that at least one swing member (21) is hung on a suspension point of the drum (1).
The rotating equipment according to any one of claims 1-6, further comprising one or more sets of spiral bodies (3) arranged in the drum (1), and the spiral bodies (3) extend along the The roller (1) extends spirally in the axial direction, the side wall of the spiral body (3) and the cylinder wall of the roller (1) form a spiral material channel (5), and the carbon stripping device (2) is arranged on the spiral The wall of the material channel (5).
The rotary equipment according to claim 7, wherein when the carbon stripping device (2) is a swinging member (21), the phases respectively suspended and fixed on the two side walls of the spiral material channel (5) Among the two adjacent swinging parts (21), one of the swinging parts (21) has a suspension point at a position where the spiral material channel (5) is close to the inner wall of the drum (1), and the other swinging part The suspension point of (21) is located at the position of the spiral material channel (5) away from the inner wall of the drum (1), and the two adjacent swing members (21) are staggered in the circumferential direction, and the two adjacent ones The swing member (21) overlaps during the swing process.
The rotary device according to claim 7, characterized in that the protrusions (22) are arranged on the wall surface of the spiral material channel (5).
The rotary equipment according to claim 7, characterized in that it further comprises a heating cylinder (6) which is sealed and sleeved on the outer circumference of the drum (1), and the drum (1) is relatively fixedly arranged with the heating cylinder (6). 6) Rotation; the spiral body (3) is provided with a gas communication cavity, and the gas communication cavity is in communication with the heating cylinder (6) for introducing the heating gas of the heating cylinder (6) into the gas In the communicating cavity, the outer wall of the spiral body (3) is used for heat transfer with the material in the drum (1).
The rotary device according to claim 7, characterized in that the spiral body (3) is an annular spiral body, and there is a radial distance between the inner ring of the annular spiral body and the axis of the drum (1).