CN115191626B

CN115191626B - Roasting machine

Info

Publication number: CN115191626B
Application number: CN202210889679.9A
Authority: CN
Inventors: 任博; 包志宇
Original assignee: Ningbo Changrong Brewing Equipment Co ltd
Current assignee: Ningbo Changrong Brewing Equipment Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2024-04-05
Anticipated expiration: 2042-07-27
Also published as: CN115191626A

Abstract

The invention relates to the field of mechanical equipment, in particular to a roasting machine. A roaster, comprising: a furnace; a drum disposed in the furnace chamber and rotatable therein; a screen plate arranged at one side of the rotary drum and separated from the end of the rotary drum by a prescribed gap; and the gap width adjusting mechanisms are distributed at different circumferential positions of the outer edge of the sieve plate and are used for respectively adjusting the width of a specified gap between the outer edge of the sieve plate at different circumferential positions and the end part of the outer periphery of the rotary drum. The gap width adjusting mechanism is a double-thread pair and comprises a first bolt for adjusting the width of a specified gap and a second bolt for locking the position of the sieve plate. The furnace includes first furnace and second furnace, and first furnace sets up in the top of roasting machine, and the second furnace sets up in the bottom of roasting machine. The screen plate of the roasting machine provided by the invention is adjustable, so that the gap between the screen plate and the rotary drum is ensured to be uniform, and the reduction of the scorching rate of materials is facilitated.

Description

Roasting machine

Technical Field

The invention relates to the field of mechanical equipment, in particular to a roasting machine.

Background

In the process steps of producing products such as soy sauce, the material is required to be baked. The baking can evaporate water in the material, expand tissues to be in a state of being easy to crush, and facilitate the subsequent crushing and starter propagation. In addition, the flavor and reducing sugar content can be increased by gelatinizing starch and other substances in the material by baking.

In most roasting processes, a roasting machine is used, and the roasting machine in the prior art generally comprises a hearth and a rotary drum arranged in the hearth, and materials are roasted in the rotary drum. A screen plate is arranged below the rotary drum, and hot air enters the rotary drum through holes on the screen plate. The rotary drum rotates in the baking process, the sieve plate is kept unchanged, and a gap is reserved between the rotary drum and the sieve plate.

However, the scorch rate of the materials in the roasting machine in the prior art is always higher, and the roasting effect of the roasting machine is reduced.

Therefore, how to provide a baker, which can reduce the scorching rate of materials, is a problem to be solved.

Disclosure of Invention

Aiming at the problem that the baking machine in the prior art leads to the increase of the scorching rate of materials, the invention provides a baking machine, which comprises: a furnace; a drum disposed in the furnace chamber and rotatable therein; a screen plate arranged at one side of the rotary drum and separated from the end of the rotary drum by a prescribed gap; and the gap width adjusting mechanisms are distributed at different circumferential positions of the outer edge of the sieve plate and are used for respectively adjusting the width of a specified gap between the outer edge of the sieve plate at different circumferential positions and the end part of the outer periphery of the rotary drum.

The inventors of the present application have first found, after intensive studies, that in the prior art, the screen plate plane is not adjustable, which results in uneven gaps between the screen plate and the drum, and thus uneven roasting of the material in the drum, and thus have made the above-mentioned improvements. According to the technical scheme, when the screen plate is not parallel to the rotating drum, a worker can adjust the gap through the gap width adjusting mechanism, so that the specified gap between the screen plate and the rotating drum is uniform. The uniform gap can promote uniform baking, is beneficial to reducing the scorching rate of materials and improves the safety of the baking machine. In addition, since the prescribed gap is adjustable, the staff can adjust the prescribed gap according to different material types. When smaller materials are adopted, the specified clearance is correspondingly reduced, and when larger materials are adopted, the specified clearance is correspondingly increased, so that the applicability of the baker is improved.

Preferably, the gap width adjusting mechanism is a double thread pair including a first bolt for adjusting the width of the prescribed gap and a second bolt for locking the position of the screen plate.

According to the technical scheme, the first bolt can adjust the specified gap, and the second bolt ensures that the connection of the sieve plate is stable and reliable, so that the gap width adjusting mechanism can adjust the specified gap and simultaneously ensure the stability of the sieve plate.

Preferably, the firebox comprises a first firebox and a second firebox, the first firebox is arranged at the top of the roasting machine, and the second firebox is arranged at the bottom of the roasting machine.

According to the technical scheme, the materials to be fried enter the roasting machine from the first hearth, fall into the rotating rotary drum and finally leave the roasting machine from the discharge hole. The hot air enters the roasting machine from the second hearth and enters the rotary drum through the screen plate. Under the action of the hot air pressure, the materials begin to boil in the rotary drum and rotate along with the rotary drum.

Preferably, the first furnace and the second furnace are fixedly connected, and the second furnace is provided with an overhaul port for overhauling the sieve plate.

According to the technical scheme, after the roasting machine works for a period of time, impurities are accumulated on the sieve plate, and the impurities can cause fire in the roasting process, so that the roasting machine needs to be cleaned periodically. The second hearth is provided with an overhaul port, so that operators can overhaul all parts in the hearth conveniently, and maintainability of the roasting machine is improved.

Preferably, a bending part is formed on one side, close to the first hearth, of the second hearth, the bending part comprises a first bending part parallel to the sieve plate and a second bending part extending from the first bending part to the direction perpendicular to the sieve plate, the first bending part is provided with a threaded hole, and the double-thread pair penetrates through the threaded hole to be connected with the sieve plate.

According to the technical scheme, the first bending part is parallel to the screen plate and is provided with the threaded holes, so that after the screen plate and the second hearth are fixed by the double-threaded pair, the screen plate can be kept parallel to the first bending part, the uniform prescribed gap between the screen plate and the rotary drum is facilitated, further, the baking uniformity is promoted, and the scorching rate of materials is reduced.

Preferably, the first hearth is provided with an air outlet, the second hearth is provided with an air inlet, and the roasting machine further comprises: and the sealing structure separates an interlayer space clamped by the periphery of the rotary drum and the inner periphery of the hearth from the air outlet.

The inventors of the present application have first found, after intensive studies, that an increase in the scorching rate is associated with the leakage of material, which is related to pressure, and thus made the above-mentioned improvement. According to the technical scheme, as the baking machine is provided with the sealing structure, the interlayer space clamped by the periphery of the rotary drum and the inner periphery of the hearth is separated from the air outlet, and because hot air passes through the materials and has pressure drop, the wind pressure of the hot air in the rotary drum is smaller than the wind pressure of the hot air in the interlayer space, and the materials are difficult to move from the rotary drum to the interlayer space. Avoiding the material from being stuck and even leaking caused by the hot air carrying the material from the inside of the rotary drum to the outside of the rotary drum, thereby reducing the ignition probability and the burning rate and improving the safety of the baking machine.

Preferably, the sealing structure comprises: the metal ring mounting seat is arranged around the inner periphery of the first furnace chamber; one end of the metal ring is fixed on the metal ring mounting seat, and the other end of the metal ring is abutted against the end part of the rotary drum.

According to the technical scheme, one end of the metal ring is fixedly connected with the metal ring mounting seat, the other end of the metal ring is in butt joint with the rotary drum, so that the friction between the metal ring and the rotary drum can be reduced while the interlayer space is sealed, and the service life of the sealing structure can be prolonged.

Preferably, a gap is formed between the screen plate and the first bending part, and the gap forms a channel structure for communicating the inner space of the second hearth with the interlayer space.

According to the technical scheme, the channel structure for communicating the inner space of the second hearth with the interlayer space is formed between the sieve plate and the first bending part, and after hot air enters the second hearth, the hot air can enter the interlayer space from the channel structure, so that the wind pressure of the hot air in the second hearth is the same as the wind pressure of the interlayer space. And because the wind pressure of the hot air in the rotary drum is smaller than that of the second hearth, the materials are difficult to flow out to the interlayer space along with the hot air from the rotary drum, and the leakage of the materials is avoided. Thereby reducing the scorching rate of the materials and improving the safety of the roasting machine.

Drawings

Fig. 1 is a cross-sectional view of a roaster according to an embodiment of the present invention.

Fig. 2 is a top view of a drum according to an embodiment of the present invention.

Fig. 3 is a top view of a screen deck according to an embodiment of the invention.

Fig. 4 is an enlarged view at a of fig. 1.

Fig. 5 is an enlarged view at B of fig. 1.

Fig. 6 is a cross-sectional view of a toaster according to further embodiments of the present invention.

Reference numerals: 10 hearth; 101 a first furnace; 102 a second furnace; a 20 drum; a 201 separator; 202 boiling chamber; 203 bevel portions; 30 sieve plates; 301 vent holes; 302 a discharge hole; 40 sealing structure; 401 a metal ring mount; 402 a metal ring; 403 an annular pressure plate; 50 air inlets; 51 air outlet; 52 feed inlet; 53 discharge ports; 60 bending parts; 601 a first fold; 602 a second fold; 61 threaded holes; 70 gap width adjusting mechanism; 701 a first bolt; 702 a second bolt; 703 a nut; 80 a fixing ring; 81 channel structure; 82 define a gap; 83 communicating pipe; 90 interlayer spaces; a height direction; b, a first wind direction; s is circumferential; u wind inlet direction; v, wind outlet direction; p1 is a first wind pressure; p2 second wind pressure; p3, third wind pressure; p4, fourth wind pressure; a first position; a second position; and C a third position.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

This embodiment provides a roaster, and fig. 1 is a cross-sectional view of the roaster provided by the embodiment of the present invention. As shown in fig. 1, the toaster includes a firebox 10, a drum 20 arranged within the firebox 10 and rotatable within the firebox 10, and a screen plate 30.

In this embodiment, the oven chamber 10 includes a first oven chamber 101 disposed at the top of the roaster and a second oven chamber 102 disposed at the bottom of the roaster, the first oven chamber 101 being fixedly connected to the second oven chamber 102. The top portion is referred to as an upper position in the height direction a, and the bottom portion is referred to as a lower position in the height direction a.

The first furnace 101 is provided with an air outlet 51 and a feed inlet 52, and the second furnace 102 is provided with an air inlet 50 and a discharge outlet 53. The materials to be fried enter the baker from the feed inlet 52, and the rotary drum 20 rotates continuously during the process of entering the feed inlet 52. After the material falls into the rotating drum 20, the material is driven by the rotating drum 20 to be in a rotating state, the material rotates to the position of the discharge hole 53, and finally leaves the baker from the discharge hole 53.

During the baking process, hot air enters the second hearth 102 from the air inlet 50 along the air inlet direction u, enters the rotary drum 20 through the screen plate 30, and finally leaves the baking machine from the air outlet 51 along the air outlet direction v. When the materials are in the rotary drum 20, hot air continuously enters the rotary drum 20 through the sieve plate 30, so that the materials are boiled in the rotary drum 20 under the action of the hot air, and the materials are baked. The air inlet 50 is arranged below the roasting machine in the height direction a, and the air outlet 51 is arranged above the roasting machine in the height direction a, so that materials are blown up from bottom to top along the height direction, the materials can fully utilize the inner space of the rotary drum 20, and roasting of the materials in the rotary drum 20 can be more uniform.

In other embodiments of the present invention, the material is not limited to wheat, but may be barley, rice, etc., and is not particularly limited herein.

In other embodiments of the present invention, the furnace 10 is not limited to the manner in which the first furnace 101 and the second furnace 102 are connected in the present embodiment, and the first furnace 101 and the second furnace 102 may be integrated, which is not particularly limited herein.

Further, the screen deck 30 is disposed on a side of the bowl 20 adjacent the second furnace 102, and since the bowl 20 is rotating and the screen deck 30 is stationary, the screen deck 30 is separated from an end of the bowl 20 adjacent the second furnace 102 by a prescribed gap 82 (shown in fig. 5), reducing or even avoiding damage caused by wear between the screen deck 30 and the bowl 20.

Fig. 2 is a plan view of the drum 20 according to the embodiment of the present invention, and as shown in fig. 2, a plurality of partitions 201 are provided between the inner circumference and the outer circumference of the drum 20 to partition the inside of the drum 20 into a plurality of boiling chambers 202. Under the action of the wind pressure of the hot air, the material begins to boil in the boiling chamber 202 and follows the rotation of the drum 20.

Fig. 3 is a top view of a screen panel 30 according to an embodiment of the present invention, as shown in fig. 3, with a plurality of ventilation holes 301 provided in the screen panel 30 such that hot air from the air inlet 50 (shown in fig. 1) enters the second furnace 102 (shown in fig. 1) and then passes through the ventilation holes 301 into the drum 20 (shown in fig. 1). The velocity of the hot air through vent 301 is very fast and can blow up the material in boiling chamber 202 (shown in fig. 2).

The screen plate 30 is further provided with a discharge hole 302, and the position of the discharge hole 302 corresponds to and communicates with the discharge hole 53 (shown in fig. 1). When the material rotates with the drum 20 to the position corresponding to the discharge hole 302, the material falls to the discharge hole 302 under the action of gravity and enters the discharge hole 53 from the discharge hole 302. The vent holes 301 are not arranged in the vicinity of the discharge holes 302, so that the problem that smooth discharge cannot be realized due to the fact that heated wind blows when materials rotate to the discharge holes 302 is avoided.

Fig. 4 is an enlarged view of fig. 1 at a, and further, as shown in fig. 4, the toaster further includes a sealing structure 40, the sealing structure 40 separating an interlayer space 90 sandwiched by the outer circumference of the drum 20 and the inner circumference of the first hearth 101 from the air outlet 51. In the present embodiment, the sealing structure 40 includes a metal ring mount 401 and a metal ring 402 provided around the inner periphery of the first furnace 101. One end of the metal ring 402 is fixedly connected to the metal ring mount 401, and the other end abuts against the end of the drum 20. During rotation of the drum 20, friction is generated with the metal ring 402 provided to the metal ring mount 401.

In the process of friction between the metal ring 402 and the rotary drum 20, the metal ring 402 has certain deformability and can be matched with the rotary drum 20 as much as possible, so that the arrangement mode of the metal ring 402 and the rotary drum 20 in abutting connection can reduce friction between the metal ring 402 and the rotary drum 20 while sealing the interlayer space 90, and the service life of the sealing structure 40 is prolonged.

By providing the sealing structure 40, material can be reduced or even prevented from being blown out from the top of the drum 20 (i.e. above the drum 20 in the height direction a) and from the interlayer space 90 into the interlayer space 90 above the height direction a when being baked. The seal 40 also serves to reduce or even prevent material from entering the interlayer space 90 from the bowl 20 and screen deck 30 (shown in fig. 3), as will be described in more detail below.

The metal ring 402 in this embodiment is formed by a 0.1mm 304 stainless steel coil, and has a higher deformability to accommodate the drum 20 than a thicker metal ring 402 due to the thinner thickness of the metal ring 402, so that friction between the metal ring 402 and the drum 20 can be effectively reduced. In addition, the temperature of drum 20 is as high as several hundred degrees celsius during operation of the roaster, and metal ring 402 of 304 stainless steel material is well suited for use in this environment. In other embodiments of the present invention, the metal ring 402 may have other thicknesses, and may be made of other materials, which is not specifically limited herein.

In this embodiment, a beveled portion 203 is also formed around the end of the drum 20 remote from the second furnace 102. The metal ring 402 is abutted against the inclined surface 203 so as not to interfere with the rotation of the drum 20. The inclined surface 203 can further reduce the gap between the drum 20 and the metal ring mount 401, which is advantageous for improving the sealability of the seal structure 40. In addition, the inclined surface part 203 can change the contact between the metal ring 402 and the rotary drum 20 from surface contact to line contact, so that the contact area between the metal ring 402 and the rotary drum 20 is effectively reduced, friction between the metal ring 402 and the rotary drum 20 can be reduced, and the service lives of the metal ring 402 and the rotary drum 20 are prolonged.

In other embodiments of the present invention, the sealing structure 40 is not limited to the metal ring mounting seat 401 and the metal ring 402 in the present embodiment, and may be other structures or arrangements of the sealing structure 40, which are not specifically limited herein.

Further, the metal ring mounting seat 401 further comprises an annular pressing plate 403 which is arranged around the inner periphery of the metal ring mounting seat 401, and the outer periphery of the annular pressing plate 403 and the metal ring mounting seat 401 jointly clamp the metal ring 402. The annular pressing plate 403 and the metal ring mounting seat 401 clamp and fix the metal ring 402 from two sides of the metal ring 402 respectively, so that the metal ring 402 is firmly and stably connected with the metal ring mounting seat 401 in the process of roasting materials by a roasting machine.

Fig. 5 is an enlarged view of fig. 1 at B, and further, as shown in fig. 5, the toaster has a channel structure 81 connecting the inner space of the second hearth 102 with the interlayer space 90, and a bent portion 60 is formed at one side of the second hearth 102 adjacent to the first hearth 101. In the present embodiment, the bent portion 60 includes a first bent portion 601 parallel to the screen plate 30 and a second bent portion 602 extending from the first bent portion 601 in a direction perpendicular to the screen plate 30. A gap is formed between the screen plate 30 and the first bent portion 601, and the gap constitutes a channel structure 81 that communicates between the inner space of the second furnace 102 and the interlayer space 90.

Here, in the baking process, the air pressure of the second furnace 102 is the first air pressure P1, the air pressure between the material and the screen plate 30 is the second air pressure P2, the air pressure above the material is the third air pressure P3, and the air pressure of the interlayer space 90 is the fourth air pressure P4, as described with reference to fig. 1.

As shown in fig. 5, after the hot air enters the second furnace 102, the hot air can enter the interlayer space 90 from the channel structure 81 along the first wind direction b, and because the sealing structure 40 is disposed between the first furnace 101 and the drum 20, the first wind pressure P1 of the hot air in the second furnace 102 is the same as the fourth wind pressure P4 of the interlayer space 90, that is, p1=p4.

There is a pressure drop in the hot air through the screen deck 30, so p4=p1 > P2, and in addition, there is a pressure drop in the hot air through the screen deck 30 through the material and the wind pressure of the hot air in the drum 20 is less than the wind pressure in the second furnace 102, so p4=p1 > P2> P3. Under such a pressure relationship, hot air is blown from the interlayer space 90 into the drum 20, and it is difficult for the material to move from the drum 20 to the interlayer space 90 from the predetermined gap 82 in the opposite direction of the first air direction b, thereby preventing the material from leaking.

If the sealing structure 40 is not provided, the interlayer space 90 is in communication with the drum 20, and the fourth wind pressure P4 is the same as the third wind pressure P3, such that p1> p2> p3=p4. In this case, the hot air drives the material to move from the predetermined gap 82 to the interlayer space 90, so that the material is caught in the predetermined gap 82 and even passes through the gap to enter the interlayer space 90. The material stuck in the gap 82 or in the interlayer space 90 can cause the material to bake for a long time and not be discharged out of the baking machine, and the time of normal baking is exceeded, so that the burning rate is increased and even the fire hidden trouble is caused.

The baking machine in this embodiment reduces or even avoids the occurrence of the situation that the material is blocked in the prescribed gap 82 and enters the interlayer space 90 by arranging the sealing structure 40 and the channel structure 81, thereby being beneficial to reducing the burning rate of the material and improving the safety of the baking machine.

Fig. 6 is a cross-sectional view of a baker according to another embodiment of the present invention, as shown in fig. 6, in which the channel structure 81 that communicates the inner space of the second firebox 102 with the interlayer space 90 may also be a communication pipe 83, and the communication pipe 83 is a pipe that communicates the interlayer space 90 with the inner space of the second firebox 102 such that p4=p1, thereby preventing the material from leaking out to the interlayer space 90. The channel structure 81 may be arranged in other ways, which are not particularly limited herein.

Further, as shown in fig. 1 and 5, the toaster further includes a plurality of gap width adjusting mechanisms 70 distributed at different circumferential positions of the outer edge of the screen plate 30 for adjusting the width of a prescribed gap 82 between the outer edge of the screen plate 30 and the end of the outer circumference of the drum 20, respectively, at the different circumferential positions. The circumferential position herein means a plurality of positions distributed along the circumferential direction s at the outer edge of the screen plate 30. In the present embodiment, the circumferential positions are a first position a, a second position B, and a third position C uniformly distributed along the circumferential direction s on the outer edge of the screen plate 30. According to the principle that three points form one surface, the plane can be adjusted by the three points, and in addition, the three points which are uniformly distributed are better in stability, so that the screen plate is stable in the baking process. In other embodiments of the present invention, the circumferential positions are not limited to a uniform distribution, but may be non-uniform, and the positions are not limited to three points, but may be other numbers, which are not specifically limited herein.

A plurality of gap width adjustment mechanisms 70 are provided such that a prescribed gap 82 between the screen deck 30 and the bowl 20 is adjustable. When the screen deck 30 and the bowl 20 are not parallel, a worker can adjust the gap width adjustment mechanism 70 so that the predetermined gap 82 between the screen deck 30 and the bowl 20 is uniform. The uniform gap 82 can promote uniform baking, which is beneficial to reducing the scorching rate of materials and improving the safety of the baking machine.

In addition, since the prescribed gap 82 is adjustable, the worker can adjust the prescribed gap 82 according to the kind of the material. When smaller materials are used, the prescribed gap 82 is correspondingly smaller, and when larger materials are used, the prescribed gap 82 is correspondingly larger, thereby improving the applicability of the roaster.

In the present embodiment, the gap width adjusting mechanism 70 is a double-screw pair, and three sets of double-screw pairs are counted. By adjusting three sets of double screw pairs, i.e. three gap width adjustment mechanisms 70, the plane of the screen deck 30 can be adjusted parallel to the plane of the bowl 20. The three sets of screw thread pairs play a role in adjusting, and meanwhile time and effort consumed by workers for adjusting the specified gap 82 are reduced, so that maintenance and adjustment of subsequent workers are facilitated.

Specifically, the gap width adjustment mechanism 70 in the present embodiment includes a first bolt 701 for adjusting the width of the prescribed gap 82 and a second bolt 702 for locking the position of the screen plate 30. The first bending portion 601 is provided with a screw hole 61 matching with the first bolt 701, and the first bolt 701 is connected to the screen plate 30 through the screw hole 61.

The first bolt 701 is engaged with the screw hole 61 provided in the first folded portion 601, and by adjusting the first bolt 701, the inner circumference of the first bolt 701 can be adjusted to be hollow and have an internal thread so that the second bolt 702 can pass through the first bolt 701 and be fixedly engaged with the first bolt 701. The second furnace 102 also includes a retaining ring 80, which is of annular configuration. The fixing ring 80 is fixedly connected with the screen plate 30, and the fixing ring 80 is provided with a through hole matched with the second bolt 702. The second bolt 702 sequentially passes through the fixing ring 80 and the first bolt 701, and then the other end is fixed by the nut 703, so that the first bolt 701 and the fixing ring 80 are locked. The second bolts 702 ensure that the connection of the screen plate 30 is stable and reliable, thereby enabling the gap width adjusting mechanism 70 to adjust the prescribed gap 82 while ensuring the stability of the screen plate 30.

In this embodiment, the fixing ring 80 is connected to the screen plate 30 by a threaded connection, and the threaded connection is a detachable connection mode, so that the subsequent detachment and replacement of the screen plate 30 are facilitated.

In other embodiments of the present invention, the gap width adjusting mechanism 70 may be other structures or arrangements, which are not particularly limited herein. For example, the gap width adjustment mechanism 70 may be implemented by a plurality of support blocks for supporting the screen deck 30, with adjustments to the support blocks, such as replacement of support blocks of different heights.

After a period of operation of the roaster, there is a build up of impurities on the screen deck 30 which may cause a fire during the roasting process and therefore require periodic cleaning. The second furnace 102 is provided with an access opening for overhauling the screen deck 30, and since the screen deck 30 in the present embodiment is installed from bottom to top in the height direction a, it is possible to quickly take out and clean the screen deck 30 from the access opening of the second furnace. This arrangement facilitates the maintenance of the various components within the firebox 10 by personnel and improves the safety and maintainability of the roaster.

Those skilled in the art will appreciate that the specific features of the various embodiments may be adaptively split or combined. Such splitting or combining of specific technical features does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting or combining falls within the protection scope of the present invention. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A roaster, comprising:

the hearth comprises a first hearth and a second hearth, the first hearth is arranged at the top of the roasting machine, and the second hearth is arranged at the bottom of the roasting machine; a bending part is formed on one side, close to the first hearth, of the second hearth, the bending part comprises a first bending part parallel to the sieve plate and a second bending part extending from the first bending part to a direction perpendicular to the sieve plate, and the first bending part is provided with a threaded hole;

a drum disposed in the first furnace chamber and rotatable therein, an interlayer space being formed between an outer periphery of the drum and an inner periphery of the first furnace chamber;

a screen plate arranged on one side of the rotary drum and separated from the end part of the rotary drum by a prescribed gap, wherein a gap is arranged between the screen plate and the first bending part, and the gap forms a channel structure for communicating the inner space of the second hearth with the interlayer space;

a plurality of gap width adjusting mechanisms distributed at different circumferential positions of the screen plate outer edge for respectively adjusting the width of the prescribed gap between the screen plate outer edge at the different circumferential positions and the end of the outer circumference of the drum; the gap width adjusting mechanism is a double-thread pair and comprises a first bolt for adjusting the width of the specified gap and a second bolt for locking the position of the sieve plate, and the double-thread pair penetrates through the threaded hole to be connected with the sieve plate.

2. The roaster as set forth in claim 1 wherein said first firebox is fixedly connected to said second firebox, said second firebox being provided with an access opening for servicing said screen deck.

3. The roaster as set forth in claim 2 wherein said first hearth is provided with an air outlet and said second hearth is provided with an air inlet, said roaster further comprising:

and the sealing structure separates the interlayer space from the air outlet.

4. The roaster as set forth in claim 3 wherein said seal assembly comprises:

the metal ring mounting seat is arranged around the inner periphery of the first furnace chamber;

and one end of the metal ring is fixed on the metal ring mounting seat, and the other end of the metal ring is abutted against the end part of the rotary drum.