Whole chicken smoking and baking machine with multi-stage exhaust gas purification section

Abstract

This invention relates to the field of food smoking and roasting equipment technology, and discloses a whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section. It includes a roasting chamber body with an oven door, a sealing frame disposed outside the oven door opening, a sealing box fixed to the top of the roasting chamber body, and a multi-stage suction filter connected to the sealing box. The sealing box contains a flow-slowing mechanism, a gap control mechanism, a pushing mechanism, a toggle mechanism, and a limiting mechanism. The cone in the flow-slowing mechanism is opposite to the second connecting pipe opening and forms a smoke exhaust gap. When the oven door is opened, the toggle mechanism rotates with the oven door and drives the pushing mechanism to push the push rod, causing the cone to move away from the second connecting pipe opening to increase the smoke exhaust gap, facilitating the entry of smoke into the exhaust path when the door is opened. After the oven door is closed, the cone returns to its original position to reduce the smoke exhaust gap, ensuring sufficient smoke residence time during the closed-door smoking stage.

Description

Technical Field

[0001] This invention belongs to the technical field of food smoking and roasting equipment, and particularly relates to a whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section. Background Technology

[0002] Whole chicken smoking and roasting is usually carried out in a relatively enclosed roasting chamber. The smoke generated by the smoking material comes into contact with the skin of the whole chicken in the chamber, so that the surface of the whole chicken forms a certain smoky color and is covered with smoky aroma. At the same time, the oil fumes, water vapor and residual smoke generated during the roasting process need to be discharged through the smoke exhaust channel and then purified to reduce the direct discharge of smoke into the processing environment.

[0003] During the whole chicken processing, the operator does not always keep the oven door closed. Instead, the operator needs to open the oven door briefly to observe, brush oil, or adjust the placement of the whole chicken, depending on the coloring of the whole chicken, the dryness of the skin, and the position of the heat source. This type of operation usually occurs when the whole chicken is still in the smoking and roasting stage, and there is still high-temperature smoke inside the oven. After the oven door is opened, the smoke near the opening of the oven door will move outward due to the disturbance of the opening door, the rise in temperature difference, and the change in pressure inside and outside the cavity, which can easily form smoke clouds that overflow in front of the operator.

[0004] For whole chicken smoking and roasting equipment with exhaust gas purification section, the role of exhaust gas status is different in different usage scenarios. During the smoking stage with the oven door closed, excessive exhaust gas will cause the smoke to leave the roasting chamber quickly, shortening the contact time between the whole chicken surface and the smoke, which may affect the formation of smoke color and the adhesion of smoke aroma. However, when the door is opened for observation, oiling, or adjustment of the whole chicken position, if the exhaust gas capacity is still set according to the smaller exhaust volume of the closed-door smoking stage, the disturbed smoke at the door opening will not easily enter the exhaust gas channel in time and will easily diffuse outward from the oven door opening.

[0005] In existing whole chicken smoking and roasting equipment, the exhaust port or exhaust channel is mostly set according to a relatively fixed exhaust volume. If the exhaust volume is too small in order to ensure the smoking effect when the door is closed, it is difficult to adapt to the situation where the smoke escapes in a concentrated manner when the door is opened. If the exhaust volume is increased in a long-term manner to reduce the smoke overflow when the door is opened, the smoke residence time during the smoking stage when the door is closed will be insufficient. Therefore, in scenarios where the whole chicken is still in the smoking and roasting process and needs to be opened for a short time for observation, oiling, or position adjustment, the fixed exhaust state is difficult to simultaneously take into account the smoke residence during smoking when the door is closed and the suppression of smoke escape when the door is opened. Summary of the Invention

[0006] The purpose of this invention is to provide a whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section, which solves the technical problem in the prior art that the exhaust smoke extraction intensity is difficult to balance closed-door smoking and coloring with open-door smoke suppression during the whole chicken smoking and roasting process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section includes: a roasting oven body having an oven door; a sealing box fixedly disposed on the top of the roasting oven body; a multi-stage suction filter communicating with the sealing box; and a flow-regulating mechanism disposed within the sealing box. The flow-regulating mechanism includes a sliding plate with a groove, a cone block disposed on the sliding plate, a first connecting pipe communicating with the multi-stage suction filter, and a second connecting pipe communicating with the inner cavity of the roasting oven body. The cone block and the opening of the second connecting pipe are positioned opposite each other. A smoke exhaust gap is formed between the two; the gap control mechanism includes a push rod that is linked to the opening and closing action of the furnace door, and the push rod is connected to the sliding plate; wherein, when the furnace door is closed, the push rod causes the cone block to approach the opening of the second connecting pipe to reduce the smoke exhaust gap; during the opening or closing of the furnace door, the push rod causes the cone block to move away from the opening of the second connecting pipe to increase the smoke exhaust gap, thereby reducing the smoke extraction volume when the door is closed to prolong the smoke residence time, and increasing the smoke extraction volume when the door is open to suppress the escape of smoke.

[0008] According to some embodiments, a sealing frame is also fixedly installed on the oven body. The sealing frame surrounds the outside of the oven door opening of the oven body. The sealing box is fixedly connected to the sealing frame and together with the sealing frame forms a sealing buffer space at the oven door opening. During the opening of the oven door, the sealing buffer space is used to temporarily store and restrict the flue gas escaping from the oven body, so as to reduce the probability of flue gas escaping directly from the oven door opening.

[0009] According to some embodiments, the sealing box is further provided with a toggle mechanism, which includes: a second rotating shaft, which is coaxially arranged with the hinge axis of the furnace door and fixedly connected to the furnace door or the door hinge of the furnace door, so that the second rotating shaft rotates synchronously with the opening and closing action of the furnace door; a sector gear, which is fixedly installed on the second rotating shaft; and a protrusion, which is fixedly installed on the second rotating shaft.

[0010] According to some embodiments, the sealing box is further provided with a pushing mechanism, which includes: a first rotating shaft, rotatably installed inside the sealing box, on which a second gear is fixedly installed; a rotating seat, fixedly installed inside the sealing box, on which a second transmission screw is rotatably installed; a first bevel gear, fixedly installed on the second transmission screw, on which a second bevel gear fixedly connected to the first rotating shaft meshes; and a threaded block, slidably connected to the sealing box and threadedly connected to the second transmission screw.

[0011] According to some embodiments, the gap control mechanism further includes: a sealed force transmission tube, fixedly installed on the second connecting tube and slidably connected to the push rod; a first spring, sleeved on the push rod, one end fixedly connected to the sealed force transmission tube and the other end fixedly connected to the push rod; a piston, slidably installed inside the sealed force transmission tube and fixedly connected to the push rod; and an internally threaded tube, slidably installed inside the sealed force transmission tube and connected to the sealed force transmission tube via the second spring.

[0012] According to some embodiments, the sealing box is further provided with an adjustment mechanism, which includes: a drive frame, which is slidably installed inside the sealing box and connected to the sealing box by a third spring; and a row of toothed racks, which are fixedly installed on the drive frame.

[0013] According to some embodiments, the sealing box is further provided with a limiting mechanism, which includes: a positive and negative screw, rotatably mounted on the sealing box, on which a third gear meshing with a row of racks is fixedly mounted; two threaded plates, both threadedly connected to the positive and negative screw and slidably connected to the sealing box; and two fixed tubes, both fixedly mounted on the second connecting tube.

[0014] According to some embodiments, the limiting mechanism further includes: two mounting tubes, which are respectively fixedly mounted on the two threaded plates and slidably connected to the two fixed tubes; and a limiting post, which is slidably mounted on the mounting tube and connected to the mounting tube by a fourth spring.

[0015] According to some embodiments, the flow-slowing mechanism further includes: a transfer box, the bottom end of which is fixedly connected to the second connecting pipe and the top end of which is fixedly connected to the first connecting pipe; a buffer cavity is formed inside the transfer box to allow the flue gas discharged from the second connecting pipe to diffuse and slow down before entering the first connecting pipe; and multiple baffles, which are spaced apart along the axial direction of the first connecting pipe and together with the inner wall of the first connecting pipe to define a baffle channel, so that the flue gas entering the first connecting pipe flows along a tortuous path, thereby extending the flue gas flow path and reducing the impact velocity of the flue gas before entering the multi-stage suction filter.

[0016] According to some embodiments, the gap control mechanism further includes: a first transmission screw threaded inside the internally threaded tube and rotatably connected to the cone block; and a rotating disk fixedly mounted on the first transmission screw.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, when the furnace door is opened, the second rotating shaft drives the sector gear to rotate. The sector gear drives the second gear, the first rotating shaft, the second bevel gear, the first bevel gear, and the second transmission screw to move. This causes the threaded block to push the push rod and piston to move. The pressure inside the sealed transmission tube pushes the internal threaded tube to move the cone block away from the opening of the second connecting pipe. When the door is opened for observation, oiling, or adjustment of the whole chicken position, the exhaust gap increases with the movement of the furnace door. This allows the hot flue gas disturbed by the opening to preferentially enter the exhaust path, reducing the direct escape of flue gas from the furnace door opening. At the same time, after the furnace door is closed, the cone block returns to the small gap position, so that the necessary flue gas residence time can still be retained during the closed-door smoking stage.

[0018] 2. In this invention, the sealing frame is placed outside the oven door opening, and the sealing box and the sealing frame form a sealing buffer space at the oven door opening. After the oven door is opened, the flue gas brought out from the oven body first enters the sealing buffer space, and then is guided to the second connecting pipe under the action of the increased exhaust gap. This restricts the flow range of flue gas when the door is open for observation, oiling, and adjusting the position of the whole chicken, making it less likely to directly diffuse to the area in front of the operator. It also avoids the long-term strong exhaust gas during the closed-door smoking stage due to simply increasing the overall machine suction volume.

[0019] 3. In this invention, when the oven door is opened, the protrusion changes the position of the drive frame. The drive frame drives the rack, the third gear, and the positive and negative screws to move, causing the two threaded plates to move the mounting tube closer to the sliding plate and the limiting post to enter the groove of the sliding plate. When the oven door is opened briefly and then quickly closed, the limiting post only maintains a large exhaust gap during the closing transition phase. Subsequently, it exits the groove as the protrusion resets, allowing the cone to return to a small gap state in time, without continuously drawing away the smoke required for subsequent smoking. When there is no smoked chicken in the oven body, the oven door can stay at the corresponding position of the sealing buffer space, and the limiting post continues to maintain the position of the sliding plate, allowing residual smoke and fumes to be continuously discharged in a relatively enclosed state.

[0020] 4. This invention allows the flue gas discharged from the second connecting pipe to first enter the transfer box for diffusion, and then enter the first connecting pipe equipped with a baffle and flow along a tortuous path. The flue gas slows down and changes direction before entering the multi-stage suction filter. During the turning process, some oil mist, water vapor and fine particles are more likely to come into contact with the pipe wall or baffle, reducing the degree to which the flue gas directly impacts the inlet of the multi-stage suction filter under the open exhaust state. At the same time, the rotating disk and the first transmission screw can change the initial position of the cone block before processing, so that the closed exhaust gap can be pre-adjusted according to the size of the whole chicken, the amount of smoke produced and the ventilation status of the filter. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the whole chicken smoking and roasting machine in this invention; Figure 2 This is a schematic diagram of the mating structure of the sealing frame and the sealing box in this invention; Figure 3 This is a schematic diagram of the internal assembly structure of the sealing box in this invention; Figure 4 This is a schematic diagram of the actuation mechanism in this invention; Figure 5 This is a schematic diagram of the pushing mechanism in this invention; Figure 6 This is a schematic diagram of the cooperation structure between the limiting mechanism and the second connecting pipe in this invention; Figure 7 This is a schematic diagram of the structure of the sliding plate and the cone block in this invention; Figure 8 This is a schematic diagram of the clearance control mechanism in this invention; Figure 9 This is a schematic diagram of the cooperative structure of the mounting tube, the fourth spring, and the limiting post in this invention; Figure 10 This is a schematic diagram of the cooperation structure between the adjustment mechanism, the third gear, and the positive and negative screws in this invention; Figure 11 This is a schematic diagram of the cooperative structure of the first connecting pipe, the partition, the transfer box, and the second connecting pipe in this invention.

[0023] Reference numerals: 100, Oven body; 101, Sealing frame; 102, Sealing box; 103, Multi-stage suction filter; 110, Flow control mechanism; 111, Slide plate; 112, Cone block; 113, First connecting pipe; 114, Partition plate; 115, Transfer box; 116, Second connecting pipe; 120, Gap control mechanism; 121, Push rod; 122, First spring; 123, Piston; 124, Second spring; 125, Rotating disk; 126, First transmission screw; 127, Internally threaded pipe; 128, Sealed force transmission pipe; 130, Adjustment mechanism; 131, Drive. Frame; 132, rack and pinion; 133, third spring; 140, pushing mechanism; 141, first bevel gear; 142, threaded block; 143, rotating seat; 144, second transmission screw; 145, first rotating shaft; 146, second gear; 147, second bevel gear; 150, actuating mechanism; 151, second rotating shaft; 152, sector gear; 153, protrusion; 160, limiting mechanism; 161, positive and negative screws; 162, threaded plate; 163, fixing tube; 164, mounting tube; 165, third gear; 166, fourth spring; 167, limiting post. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0027] This invention is described in detail with reference to the accompanying drawings. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not to scale. Furthermore, the accompanying drawings are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0028] Furthermore, it should be noted in the description of this invention that the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example 1: As Figure 1 , Figure 3 , Figure 7 , Figure 8 and Figure 11 As shown, a whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section includes a roasting chamber body 100, which has a door; a sealing box 102 is fixedly installed on the top of the roasting chamber body 100; a multi-stage suction filter 103 is connected to the sealing box 102; the multi-stage suction filter 103 is an existing integrated component, including an air intake unit and a multi-stage filtration unit, the air intake unit is used to provide suction power for the flue gas, and the multi-stage filtration unit is used to sequentially separate oil mist, filter particles, and treat odors in the flue gas; a slowing flow mechanism 110 is installed inside the sealing box 102, the slowing flow mechanism 110 includes a slide plate 111 with a groove, a cone 112 installed on the slide plate 111, and a first stage suction filter 103 connected to the multi-stage suction filter 103. A connecting pipe 113 and a second connecting pipe 116 communicating with the inner cavity of the oven body 100 are provided. A cone block 112 is arranged opposite to the opening of the second connecting pipe 116, forming a smoke exhaust gap between them. The gap control mechanism 120 includes a push rod 121 that is linked to the opening and closing action of the oven door. The push rod 121 is connected to the slide plate 111. When the oven door is closed, the push rod 121 moves the cone block 112 closer to the opening of the second connecting pipe 116 to reduce the smoke exhaust gap. During the opening or closing of the oven door, the push rod 121 moves the cone block 112 away from the opening of the second connecting pipe 116 to increase the smoke exhaust gap. This reduces the smoke extraction volume when the door is closed to prolong the smoke residence time, and increases the smoke extraction volume when the door is open to suppress the escape of smoke.

[0031] During the whole chicken smoking and roasting process, the coloring and aroma of the chicken skin by the smoke are related to the smoke residence time, smoke flow rate, skin humidity, and oven temperature distribution. If the exhaust flow area at the second connecting pipe 116 is consistently large, the suction effect of the multi-stage suction filter 103 will cause the smoke in the roasting oven body 100 to be discharged quickly, shortening the contact time of the smoke components on the surface of the whole chicken, which may result in a lighter smoke color or insufficient aroma. If the exhaust flow area at the second connecting pipe 116 is consistently small, the hot smoke in the roasting oven body 100 will rush out of the oven door opening at the moment the oven door is opened due to the temperature difference and the disturbance caused by the opening, affecting the operating area environment.

[0032] A variable exhaust gap is formed by the cone block 112 and the inlet of the second connecting pipe 116, and the effective flow area is changed by the cone surface entering or exiting the area near the inlet. When the suction pressure difference is similar, the exhaust volume is positively correlated with the effective flow area. When the cone block 112 is close to the second connecting pipe 116, the flue gas needs to bypass the annular gap between the cone block 112 and the inlet, the local resistance increases, and the flue gas in the baking oven body 100 is discharged at a slower speed. When the cone block 112 is far away from the second connecting pipe 116, the annular gap widens, the suction channel of the second connecting pipe 116 to the inner cavity of the baking oven body 100 becomes wider, and the smoke when the oven door is opened can preferentially enter the slow flow mechanism 110 through the second connecting pipe 116, and then enter the multi-stage suction filter 103.

[0033] Example 2: Figure 1 and Figure 2 As shown, based on Embodiment 1, a sealing frame 101 is also fixedly installed on the oven body 100. The sealing frame 101 surrounds the outside of the oven door opening of the oven body 100. The sealing box 102 is fixedly connected to the sealing frame 101 and together with the sealing frame 101 forms a sealing buffer space located at the oven door opening. During the opening of the oven door, the sealing buffer space is used to temporarily store and restrict the flue gas escaping from the oven body 100, so as to reduce the probability of flue gas escaping directly from the oven door opening.

[0034] The sealing frame 101 is arranged around the outside of the oven door opening, so that the flue gas released from the oven body 100 during the initial opening of the oven door first enters the sealing buffer space formed by the sealing frame 101 and the sealing box 102. This sealing buffer space is equivalent to a transition cavity set outside the oven door opening. The flow boundary of the flue gas in this area is constrained by the sealing frame 101, and it will not immediately diffuse towards the operator. Instead, it is guided to the upper or internal exhaust path by the suction of the sealing box 102 and the second connecting pipe 116. The sealing box 102 is fixedly connected to the sealing frame 101, so that the sealing buffer space and the sealing box 102 are not separate structures. The flue gas generated when the door is opened can enter the sealing box 102 in a shorter path, and then be treated by the slow flow mechanism 110 and the multi-stage suction filter 103.

[0035] The sealing frame 101 can also serve as an outer barrier during the oven door closing process. When the oven door is briefly opened for observation, oiling, or adjusting the position of the whole chicken, and then re-enters the sealing frame 101, the area around the oven door opening first returns to a relatively enclosed state. The sealing buffer space formed by the sealing frame 101 and the sealing box 102 can accommodate a small amount of residual smoke brought out during the opening process. At this time, the second connecting pipe 116 is still in a state of large smoke exhaust gap, which can guide the smoke in the sealing buffer space into the slow flow mechanism 110 and the multi-stage suction filter 103 before the oven door is completely closed. As the oven door continues to close, the cone block 112 returns to a position close to the opening of the second connecting pipe 116, so that the oven body 100 returns to a state of small gap smoke exhaust, thereby avoiding the continuous extraction of smoke from the oven while the whole chicken is still in the smoking and roasting process.

[0036] In another usage scenario, when there is no smoked chicken left in the oven body 100 and it is necessary to clean the residual smoke, fumes, or hot fumes near the oven body 100, sealing frame 101, and sealing box 102, the oven door can be positioned corresponding to the sealing buffer space formed by the sealing frame 101 and sealing box 102. At this time, the sealing buffer space forms a barrier against the fumes near the oven door opening, and the second connecting pipe 116 maintains a large exhaust gap, allowing the residual fumes to continuously enter the multi-stage suction filter 103 under a relatively sealed state for empty oven odor removal or cleaning of residual fumes.

[0037] Example 3: As Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, based on Embodiments 1 and 2, the sealing box 102 is further provided with a toggle mechanism 150. The toggle mechanism 150 includes a second rotating shaft 151, a sector gear 152, and a protrusion 153. The second rotating shaft 151 is coaxially arranged with the hinge axis of the furnace door and is fixedly connected to the furnace door or the door hinge of the furnace door so that the second rotating shaft 151 rotates synchronously with the opening and closing action of the furnace door. The sector gear 152 is fixedly installed on the second rotating shaft 151, and the protrusion 153 is fixedly installed on the second rotating shaft 151.

[0038] The sealing box 102 is also equipped with a pushing mechanism 140, which includes a first rotating shaft 145, a rotating seat 143, a second transmission screw 144, a first bevel gear 141, a threaded block 142, a second gear 146, and a second bevel gear 147. The first rotating shaft 145 is rotatably mounted inside the sealing box 102, and the second gear 146 is fixedly mounted on the first rotating shaft 145; the rotating seat 143 is fixedly mounted inside the sealing box 102, and the second transmission screw 144 is rotatably mounted on the rotating seat 143; the first bevel gear 141 is fixedly mounted on the second transmission screw 144, and the first bevel gear 141 meshes with the second bevel gear 147, which is fixedly connected to the first rotating shaft 145; the threaded block 142 is slidably connected to the sealing box 102 and threadedly connected to the second transmission screw 144.

[0039] The gap control mechanism 120 also includes a sealed force transmission tube 128, a first spring 122, a piston 123, a second spring 124, and an internally threaded tube 127. The sealed force transmission tube 128 is fixedly installed on the second connecting tube 116 and slidably connected to the push rod 121; the first spring 122 is sleeved on the push rod 121, with one end fixedly connected to the sealed force transmission tube 128 and the other end fixedly connected to the push rod 121; the piston 123 is slidably installed inside the sealed force transmission tube 128 and fixedly connected to the push rod 121; the internally threaded tube 127 is slidably installed inside the sealed force transmission tube 128 and connected to the sealed force transmission tube 128 through the second spring 124.

[0040] When the furnace door is opened, the second rotating shaft 151 rotates synchronously with the furnace door hinge. After the toothed area of ​​the sector gear 152 meshes with the second gear 146, the second gear 146 drives the first rotating shaft 145 to rotate, and the first rotating shaft 145 then drives the second bevel gear 147 to rotate. The second bevel gear 147 meshes with the first bevel gear 141, causing the second transmission screw 144 to rotate on the rotating seat 143. Since the threaded block 142 is slidably connected to the sealing box 102 and threadedly connected to the second transmission screw 144, the rotation of the second transmission screw 144 is converted into the linear movement of the threaded block 142. The threaded block 142 then pushes the push rod 121 to move into the sealed force transmission tube 128.

[0041] The sealed force transmission tube 128 can be filled with liquid for transmitting pressure. When the push rod 121 pushes the piston 123 to move, the piston 123 compresses the liquid in the sealed force transmission tube 128, so that the liquid pressure acts on the internal threaded tube 127. The internal threaded tube 127 slides along the direction of the sealed force transmission tube 128 and drives the cone block 112 and the slide plate 111 to move relative to the opening of the second connecting tube 116 through the first transmission screw 126. The liquid force transmission allows the mechanical thrust of the threaded block 142 on the push rod 121 to be converted into a smoother axial displacement within the sealed force transmission tube 128. The second spring 124 is compressed during the movement of the internal threaded tube 127, and the first spring 122 is compressed when the push rod 121 is pushed. Both provide elastic force for subsequent reset.

[0042] In this way, the flue gas release caused by opening the door and the expansion of the flue gas gap will proceed simultaneously. After the flue gas gap is expanded, the suction flow area at the second connecting pipe 116 increases, and the flue gas in the sealed buffer space can more easily enter the second connecting pipe 116, thereby reducing the spread of smoke from the front of the furnace door opening.

[0043] Example 4: Figure 3 , Figure 6 , Figure 9 and Figure 10 As shown, based on the aforementioned embodiment, the sealing box 102 is further provided with an adjustment mechanism 130 and a limiting mechanism 160. The adjustment mechanism 130 includes a drive frame 131, a rack and pinion 132, and a third spring 133. The drive frame 131 is slidably installed inside the sealing box 102 and is connected to the sealing box 102 through the third spring 133. A row of rack and pinion 132 is fixedly installed on the drive frame 131. The limiting mechanism 160 includes a positive and negative screw 161, two threaded plates 162, two fixed tubes 163, two mounting tubes 164, a third gear 165, a fourth spring 166, and a limiting post 167. The positive and negative screw 161 is rotatably mounted on the sealing box 102. The third gear 165 is fixedly mounted on the positive and negative screw 161 and meshes with a row of racks 132. The two threaded plates 162 are threadedly connected to the positive and negative screw 161 and slidably connected to the sealing box 102. The two fixed tubes 163 are fixedly mounted on the second connecting tube 116. The two mounting tubes 164 are respectively fixedly mounted on the two threaded plates 162 and slidably connected to the two fixed tubes 163. The limiting post 167 is slidably mounted on the mounting tube 164 and connected to the mounting tube 164 through the fourth spring 166.

[0044] When the furnace door is opened, the second rotating shaft 151 synchronously drives the sector gear 152 and the protrusion 153 to rotate. The sector gear 152, through the pushing mechanism 140, moves the cone block 112 away from the opening of the second connecting pipe 116, while the protrusion 153 changes its contact position with the drive frame 131. Under the elastic force of the third spring 133, the drive frame 131 moves along the guide direction inside the sealing box 102. When the drive frame 131 moves, a row of racks 132 drives the third gear 165 to rotate, and the third gear 165 then drives the positive and negative screws 161 to rotate. Since the threads on both sides of the positive and negative screws 161 are opposite, the two threaded plates 162 approach each other when the positive and negative screws 161 rotate. The two threaded plates 162 respectively drive the two mounting pipes 164 to move along the fixed pipe 163 towards the slide plate 111. Under the elastic force of the fourth spring 166, the limiting post 167 enters the groove of the slide plate 111 or abuts against the edge of the groove of the slide plate 111.

[0045] After the limiting post 167 engages with the groove of the sliding plate 111, the cone block 112 and the sliding plate 111 can be driven to the large gap position by the internal threaded pipe 127 during the door opening phase. When the furnace door transitions from the open state to the closed state, the sector gear 152 first reverses and drives the push mechanism 140 to reset, the threaded block 142 gradually releases the pressure on the push rod 121, and the push rod 121 has a tendency to retract under the action of the first spring 122. The piston 123 then releases the pressure in the sealed force transmission pipe 128, and the internal threaded pipe 127 also has a tendency to reset under the action of the second spring 124. At this time, the engagement between the limiting post 167 and the groove of the sliding plate 111 is used to limit the sliding plate 111 from immediately returning to the small gap position, so that the cone block 112 continues to move away from the opening of the second connecting pipe 116 during the transition phase of the furnace door closing, and the second connecting pipe 116 still maintains a large flue gas flow area.

[0046] The aforementioned delay function serves different purposes depending on the usage scenario. When there is still smoked chicken inside the oven body 100, and the operator only needs to open the door to observe, brush oil, or adjust the position of the whole chicken, the oven door is opened for a short time. After the oven door closes, the protrusion 153 quickly enters the release position along with the second rotating shaft 151, causing the drive frame 131 to move in the opposite direction. The limit post 167 exits the groove of the slide plate 111 along with the mounting tube 164, and the cone block 112 returns to the position near the opening of the second connecting tube 116 along with the internal threaded tube 127. At this time, the limit mechanism 160 only maintains a large exhaust gap during the short transition phase of the oven door opening and closing, which is used to remove the smoke that has been disturbed by the opening of the oven door and the sealing buffer space. After the oven door is closed, it returns to a small exhaust gap and does not continuously remove the smoke used for smoking in the oven body 100.

[0047] When there is no smoked chicken left in the oven body 100, and it is necessary to clean the residual smoke or fumes in the inner cavity of the oven body 100, the sealing frame 101, and the sealing box 102, the oven door can be stopped at the position where it enters the sealing buffer space formed by the sealing frame 101 and the sealing box 102. In this state, the limiting post 167 continues to restrict the slide plate 111 from resetting, keeping the cone block 112 away from the opening of the second connecting pipe 116. The second connecting pipe 116 maintains a large smoke exhaust gap, and the residual smoke continues to enter the second connecting pipe 116 under the constraint of the sealing buffer space, and then is discharged through the transfer box 115, the first connecting pipe 113, and the multi-stage suction filter 103 to complete the odor removal and residual smoke cleaning in the empty oven state.

[0048] As the furnace door continues to approach complete closure, or as the operator pushes the furnace door to close after finishing the empty chamber venting, the protrusion 153 rotates with the second rotating shaft 151 to the position where the limit is released. The protrusion 153 pushes the drive frame 131 to move in the opposite direction against the third spring 133. A row of racks 132 drives the third gear 165 to reverse, and the forward and reverse screws 161 also reverse, causing the two threaded plates 162 to move in opposite directions. The two mounting tubes 164 retract in opposite directions along the fixed tube 163, and the limit post 167 exits from the groove of the sliding plate 111. After the limit post 167 exits, the internal threaded tube 127 resets under the action of the second spring 124, the push rod 121 resets under the action of the first spring 122, the cone 112 approaches the opening of the second connecting tube 116, and the smoke exhaust gap returns to the small gap state required for closed-door venting.

[0049] Example 5: Figure 1 , Figure 3 and Figure 11 As shown, based on the aforementioned embodiment, the flow-slowing mechanism 110 further includes a transfer box 115 and multiple baffles 114. The bottom end of the transfer box 115 is fixedly connected to the second connecting pipe 116, and the top end of the transfer box 115 is fixedly connected to the first connecting pipe 113. A buffer cavity is formed inside the transfer box 115 to allow the flue gas discharged from the second connecting pipe 116 to diffuse and slow down before entering the first connecting pipe 113. Multiple baffles 114 are spaced apart along the axial direction of the first connecting pipe 113 and together with the inner wall of the first connecting pipe 113, they define a baffle channel so that the flue gas entering the first connecting pipe 113 flows along a tortuous path, thereby extending the flue gas flow path and reducing the impact velocity of the flue gas before entering the multi-stage suction filter 103.

[0050] During the furnace door opening phase, after the cone block 112 moves away from the inlet of the second connecting pipe 116, the exhaust volume at the second connecting pipe 116 increases. If the flue gas directly enters the multi-stage suction filter 103 at high speed from the second connecting pipe 116, the water vapor, grease particles, and fine dust carried in the flue gas are easily concentrated and impact the inlet area of ​​the multi-stage suction filter 103, increasing the local load at the inlet of the multi-stage suction filter 103. The transfer box 115 is located between the second connecting pipe 116 and the first connecting pipe 113, so that the flue gas discharged from the second connecting pipe 116 first enters a larger buffer chamber. The flue gas diffuses within the transfer box 115, and the local flow velocity decreases before entering the first connecting pipe 113.

[0051] The baffles 114 are arranged at intervals along the axial direction of the first connecting pipe 113, and adjacent baffles 114 can be staggered to form a continuously bent flow channel inside the first connecting pipe 113. As the flue gas passes through the baffles 114, its flow direction changes multiple times. Some heavier oil mist particles and condensed water vapor will come into contact with the inner wall of the baffles 114 or the first connecting pipe 113 due to inertia, thereby reducing the flow velocity and impact intensity of the flue gas before entering the multi-stage suction filter 103. This allows for a higher exhaust volume during the open-door stage, while preventing the flue gas from rapidly flushing the multi-stage suction filter 103 in a straight-through manner during the closed-door fumigation stage.

[0052] Example 6: As Figure 7 and Figure 8 As shown, based on the aforementioned embodiment, a first transmission screw 126 is threadedly installed inside the internally threaded tube 127. The first transmission screw 126 is rotatably connected to the cone block 112, and a rotating disk 125 is fixedly installed on the first transmission screw 126. By rotating the rotating disk 125, the first transmission screw 126 can be screwed in or out relative to the internally threaded tube 127, thereby changing the initial position of the cone block 112 relative to the opening of the second connecting pipe 116 when the furnace door is closed.

[0053] Since the whole chicken smoking and roasting process is not under constant load, when the whole chicken is heavy, the skin moisture content is high, or the smoke production of the smoking feed is high, the smoke concentration inside the roasting oven 100 rises rapidly. It is necessary to ensure the smoke residence time while avoiding excessive smoke accumulation inside the oven. When the whole chicken is light, the smoking feed is less, or the multi-stage suction filter 103 is in good condition, if the initial smoke exhaust gap is too large, the smoke may be carried away quickly during the closing stage. The cooperation between the rotating disk 125 and the first drive screw 126 allows the initial closing position of the cone block 112 to be preset. When the first drive screw 126 is screwed out more from the internal threaded tube 127, the initial distance between the cone block 112 and the second connecting tube 116 increases; when the first drive screw 126 is screwed into the internal threaded tube 127 more, the cone block 112 is closer to the opening of the second connecting tube 116, and the smoke exhaust gap decreases.

[0054] Furthermore, this adjustment does not alter the relationship between the second rotating shaft 151, the sector gear 152, the pushing mechanism 140, and the sealed force transmission tube 128. The expansion of the exhaust gap during door opening is still triggered by the opening and closing of the furnace door. The rotating disk 125 only changes the reference position at the start of the door opening action and the closed state. Thus, the equipment can pre-set the smoke exhaust volume when the door is closed according to different processing batches, and then expand the exhaust gap during the door opening stage to avoid excessively strong or weak exhaust during the closed stage due to batch differences.

[0055] The entire workflow of the equipment: Before use, check the status of the baking oven body 100, sealing frame 101, sealing box 102, multi-stage suction filter 103, slow flow mechanism 110, gap control mechanism 120, adjustment mechanism 130, pushing mechanism 140, actuating mechanism 150 and limiting mechanism 160, so that the second connecting pipe 116, transfer box 115, first connecting pipe 113 and multi-stage suction filter 103 are in a smoke exhaust state.

[0056] Based on the weight of the whole chicken, the smoke production of the smoking feed, the moisture content of the whole chicken skin, and the ventilation status of the multi-stage suction filter 103, the rotating disk 125 is rotated. The rotating disk 125 drives the first transmission screw 126 to screw into or out of the internal threaded pipe 127. The first transmission screw 126 drives the cone block 112 to change its initial position relative to the opening of the second connecting pipe 116, so that an initial smoke exhaust gap suitable for closed-door smoking is formed between the cone block 112 and the second connecting pipe 116.

[0057] The whole chicken to be processed is placed inside the oven body 100. The oven door is closed, and the oven door drives the second rotating shaft 151 to the closed position. The sector gear 152, the protrusion 153, the second gear 146, the first rotating shaft 145, the second bevel gear 147, the first bevel gear 141, the second transmission screw 144, and the threaded block 142 are all in the corresponding reset state. The threaded block 142 does not squeeze the push rod 121 or only maintains initial contact.

[0058] During closed-door smoking, the first spring 122 keeps the push rod 121 and piston 123 in the reset position, and the second spring 124 keeps the internal threaded tube 127 in the reset position. The internal threaded tube 127, through the first transmission screw 126, brings the slide plate 111 and cone block 112 close to the opening of the second connecting tube 116. A small exhaust gap is formed at the second connecting tube 116, and the smoke in the oven body 100 is discharged through the second connecting tube 116 at a slower speed, so that the smoke retains the necessary residence time during the closed-door smoking stage.

[0059] During the closed-door smoking process, the smoke enters the second connecting pipe 116 from the oven body 100, then bypasses the smoke exhaust gap between the cone block 112 and the second connecting pipe 116 and enters the transfer box 115. The transfer box 115 diffuses the smoke and then it enters the first connecting pipe 113. Multiple baffles 114 cause the smoke to flow along a tortuous path. Subsequently, the smoke enters the multi-stage suction filter 103 for treatment.

[0060] When it is necessary to open the door to observe the coloring of the whole chicken, brush oil, or adjust the position of the whole chicken, the furnace door is opened, and the furnace door drives the second rotating shaft 151 to rotate synchronously. The second rotating shaft 151 drives the sector gear 152 and the protrusion 153 to rotate. At this time, the sealing frame 101 and the sealing box 102 restrict the smoke near the furnace door opening from escaping, so that the smoke disturbed at the moment of opening the door first enters the sealing buffer space.

[0061] After the sector gear 152 rotates to mesh with the second gear 146, the second gear 146 drives the first rotating shaft 145 to rotate, the first rotating shaft 145 drives the second bevel gear 147 to rotate, the second bevel gear 147 drives the first bevel gear 141 to rotate, the first bevel gear 141 drives the second transmission screw 144 to rotate at the rotating seat 143, and the second transmission screw 144 drives the threaded block 142 to move linearly.

[0062] After the threaded block 142 moves, it pushes the push rod 121. The push rod 121 drives the piston 123 to move inside the sealed force transmission tube 128. The piston 123 squeezes the force transmission medium inside the sealed force transmission tube 128. The force transmission medium pushes the internal threaded tube 127 to move. The internal threaded tube 127 drives the rotating disk 125, the sliding plate 111 and the cone block 112 away from the opening of the second connecting pipe 116 through the first transmission screw 126. The exhaust gap at the second connecting pipe 116 increases, which is used to increase the speed of the flue gas near the furnace door entering the exhaust path at the moment of opening the door for observation, brushing oil or adjusting the position of the whole chicken.

[0063] After the cone block 112 moves away from the second connecting pipe 116, the flue gas brought out at the moment of opening the door enters the second connecting pipe 116 under the restriction of the sealing frame 101 and the sealing box 102, and then passes through the transfer box 115, the first connecting pipe 113, the partition 114 and the multi-stage suction filter 103 in sequence, thereby reducing the direct entry of flue gas into the operating area; this stage corresponds to the opening and closing process of the furnace door, and is not considered as the continuous smoke exhaust state of the closed smoke extraction stage.

[0064] As the furnace door opens, the protrusion 153 rotates with the second rotating shaft 151 and changes its position on the drive frame 131. The drive frame 131 moves under the action of the third spring 133. The drive frame 131 drives the rack 132 to move. The rack 132 drives the third gear 165 to rotate. The third gear 165 drives the positive and negative screws 161 to rotate.

[0065] After the forward and reverse screws 161 rotate, the two threaded plates 162 approach each other, and the two threaded plates 162 respectively drive the two mounting tubes 164 to move along the fixed tube 163. The limiting post 167 in the mounting tube 164 extends towards the slide plate 111 under the action of the fourth spring 166. The limiting post 167 enters the groove of the slide plate 111 or abuts against the edge of the groove, so that the slide plate 111 and the cone block 112 can be temporarily kept away from the second connecting tube 116.

[0066] If the opening of the oven door is only for observation, brushing oil, or short-term adjustment of the chicken's position while the whole chicken is still inside the oven body 100, the operator should quickly close the oven door after completing the operation. When the oven door is closed, the second rotating shaft 151 rotates in the opposite direction, and the sector gear 152 first drives the second gear 146, the first rotating shaft 145, the second bevel gear 147, the first bevel gear 141, and the second transmission screw 144 in the opposite direction, causing the threaded block 142 to retract. The push rod 121 and the piston 123 retract under the action of the first spring 122, the pressure inside the sealed force transmission tube 128 decreases, and the internal threaded tube 127 has a tendency to reset under the action of the second spring 124.

[0067] During the aforementioned rapid return process, the limiting post 167 briefly restricts the slide plate 111 from resetting, allowing the cone block 112 to maintain a large exhaust gap, which is used to remove residual smoke from the vicinity of the sealing frame 101 and sealing box 102 that was disturbed by the door opening; as the oven door continues to close, the protrusion 153 pushes the drive frame 131 to move in the opposite direction, the rack 132 drives the third gear 165 to reverse, the third gear 165 drives the positive and negative screws 161 to reverse, the two threaded plates 162 drive the two mounting tubes 164 to move in opposite directions, the limiting post 167 exits the groove of the slide plate 111, and the cone block 112 returns to the pipe opening near the second connecting pipe 116 along with the internal threaded pipe 127. The oven body 100 returns to the closed-door small-gap exhaust state, and the smoke generated thereafter continues to be used for smoking whole chickens.

[0068] When there is no smoked chicken inside the oven body 100, and it is necessary to clean the residual smoke, fumes or hot fumes near the oven body 100, sealing frame 101 and sealing box 102, the oven door can be stopped at the corresponding position of the sealing buffer space formed by sealing frame 101 and sealing box 102. At this time, the limiting post 167 continues to maintain the position of sliding plate 111, the cone block 112 remains away from the opening of the second connecting pipe 116, and the second connecting pipe 116 maintains a large smoke exhaust gap.

[0069] In the empty oven deodorization state, the residual smoke enters the second connecting pipe 116 under the enclosure of the sealing frame 101 and the sealing box 102, then enters the transfer box 115 to diffuse and slow down, then enters the first connecting pipe 113 and is guided by the partition 114 to form a baffle, and finally enters the multi-stage suction filter 103 for treatment. Since there is no smoked chicken in the oven body 100, the large gap smoke exhaust at this stage is used to clean up residual smoke and odor, and does not involve the impact on the smoking contact time of the whole chicken.

[0070] After the empty box is vented, continue to push the oven door to close. The second rotating shaft 151 drives the protrusion 153 to enter the release position. The protrusion 153 pushes the drive frame 131 to move in the opposite direction. The drive frame 131 drives the third gear 165 and the positive and negative screws 161 to reverse through the rack 132. The two threaded plates 162 move in opposite directions. The two mounting tubes 164 retract along the fixed tube 163. The limit post 167 compresses the fourth spring 166 and disengages from the groove of the slide plate 111.

[0071] After the limit post 167 disengages, the slide plate 111 is released from its holding state, and the second spring 124 pushes the internal threaded tube 127 to reset. The internal threaded tube 127 drives the cone block 112 and the slide plate 111 to approach the opening of the second connecting tube 116 through the first transmission screw 126. The first spring 122 simultaneously drives the push rod 121 and the piston 123 back to the reset position, and the equipment returns to the closed-door small smoke exhaust gap state, waiting for the next batch of whole chickens to be smoked or the next door to be opened for smoke exhaust operation.

[0072] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0073] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details and do not limit the invention to the specific embodiments described above. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section, characterized in that, include: A baking oven body, the baking oven body having an oven door; A sealing box is fixedly installed on the top of the oven body; A multi-stage suction filter is connected to the sealing box; A flow-slowing mechanism is provided inside the sealing box. The flow-slowing mechanism includes a slide plate with a groove, a cone block provided on the slide plate, a first connecting pipe communicating with the multi-stage suction filter, and a second connecting pipe communicating with the inner cavity of the baking oven body. The cone block and the opening of the second connecting pipe are arranged opposite to each other, and a smoke exhaust gap is formed between them. The gap control mechanism includes a push rod that is linked to the opening and closing action of the furnace door, and the push rod is connected to the sliding plate in a transmission manner; When the furnace door is closed, the push rod moves the cone closer to the opening of the second connecting pipe to reduce the smoke exhaust gap; during the opening or closing of the furnace door, the push rod moves the cone away from the opening of the second connecting pipe to increase the smoke exhaust gap, thereby reducing the smoke extraction volume when the door is closed to prolong the smoke residence time, and increasing the smoke extraction volume when the door is open to suppress the escape of smoke.

2. The whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 1, characterized in that, A sealing frame is also fixedly installed on the oven body. The sealing frame surrounds the outside of the oven door opening of the oven body. The sealing box is fixedly connected to the sealing frame and together with the sealing frame, forms a sealing buffer space at the oven door opening. During the opening of the oven door, the sealing buffer space is used to temporarily store and restrict the flue gas escaping from the oven body, so as to reduce the probability of flue gas escaping directly from the oven door opening.

3. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 1, characterized in that, The sealing box is also equipped with a toggle mechanism, which includes: The second rotating shaft is coaxially arranged with the hinge axis of the furnace door and is fixedly connected to the furnace door or the door hinge of the furnace door so that the second rotating shaft rotates synchronously with the opening and closing action of the furnace door; A sector gear is fixedly mounted on the second rotating shaft; The protrusion is fixedly installed on the second rotating shaft.

4. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 3, characterized in that, The sealing box is also equipped with a pushing mechanism, which includes: The first rotating shaft is rotatably installed inside the sealing box, and a second gear is fixedly installed on it; A rotating seat is fixedly installed inside the sealing box, and a second transmission screw is rotatably mounted on it; A first bevel gear is fixedly mounted on the second transmission screw, and a second bevel gear fixedly connected to the first rotating shaft meshes on it; The threaded block is slidably connected to the sealing box and threadedly connected to the second transmission screw.

5. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 4, characterized in that, The gap control mechanism further includes: A sealed force transmission tube is fixedly installed on the second connecting tube and slidably connected to the push rod; The first spring is sleeved on the push rod, with one end fixedly connected to the sealed force transmission tube and the other end fixedly connected to the push rod; The piston is slidably installed inside the sealed force transmission tube and is fixedly connected to the push rod. An internally threaded tube is slidably installed inside the sealed force transmission tube and connected to the sealed force transmission tube via a second spring.

6. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 3, characterized in that, The sealing box is also equipped with an adjustment mechanism, which includes: The drive frame is slidably installed inside the sealing box and connected to the sealing box via a third spring; A row of racks is fixedly mounted on the drive frame.

7. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 6, characterized in that, The sealing box is also equipped with a limiting mechanism, which includes: The positive and negative screws are rotatably mounted on the sealing box, and a third gear that meshes with a row of racks is fixedly mounted on it; Both threaded plates are threadedly connected to the positive and negative screws and are slidably connected to the sealing box; Both fixed pipes are fixedly installed on the second connecting pipe.

8. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 7, characterized in that, The limiting mechanism further includes: Two mounting tubes are respectively fixedly mounted on the two threaded plates and slidably connected to the two fixed tubes; The limiting post is slidably mounted on the mounting tube and connected to the mounting tube by a fourth spring.

9. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 1, characterized in that, The flow control mechanism also includes: The transfer box is fixedly connected to the second connecting pipe at its bottom end and to the first connecting pipe at its top end; a buffer cavity is formed inside the transfer box to allow the flue gas discharged from the second connecting pipe to diffuse and slow down before entering the first connecting pipe; Multiple baffles are spaced apart along the axial direction of the first connecting pipe and together with the inner wall of the first connecting pipe, they define a baffle channel so that the flue gas entering the first connecting pipe flows along a bend path, thereby extending the flue gas flow path and reducing the impact velocity of the flue gas before entering the multi-stage suction filter.

10. A whole chicken smoking and roasting machine with a multi-stage exhaust gas purification section according to claim 5, characterized in that, The gap control mechanism further includes: The first transmission screw is threaded inside the internally threaded tube and rotatably connected to the cone block. The rotating disk is fixedly mounted on the first transmission screw.

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