A smokehouse airflow flow rate regulating nozzle and method of controlling the same

Abstract

The application discloses a smoke oven airflow flow rate adjusting nozzle and a control method thereof. The nozzle comprises a nozzle body, a connecting pipe coaxially arranged with the nozzle body, one end of the connecting pipe fixed in the smoke oven and in communication with a positive pressure cavity of the smoke oven, the other end in communication with a large-diameter end of the nozzle body, a moving base sleeved on the nozzle body, a plurality of connecting rods circumferentially and spacedly arranged around the outer wall of the connecting pipe, one end of each connecting rod hinged to the moving base, a plurality of flow resistance sheets corresponding to the connecting rods, each flow resistance sheet comprising a main body part and a connecting part, the connecting part in a rod shape, one end of the connecting part arranged towards the central axis of the nozzle body and connected to the main body part, the other end of the connecting part passing through a through hole on the connecting pipe and hinged to the other end of the connecting rod, a first rotating shaft fixedly arranged on the connecting part, both ends of the first rotating shaft simultaneously and rotatably connected to the outer wall of the connecting pipe, and a driving mechanism for driving the moving base to move along the axial direction of the nozzle body.

Description

Technical Field

[0001] This invention belongs to the field of airflow velocity regulation technology for smokehouses, and specifically relates to a smokehouse airflow velocity regulation nozzle and its control method. Background Technology

[0002] A smokehouse is a machine used to process smoked foods. During the smoking process, the color and flavor of the smoked food largely depend on the uniformity of the airflow within the smokehouse. Uneven airflow velocity at the nozzle outlet causes a carryover effect between the jets, leading to lower-speed airflow moving towards higher-speed airflow, resulting in uneven heating of the food being processed. Most existing smokehouses suffer from food drying and uneven heating, thus affecting food quality. Summary of the Invention

[0003] One of the objectives of this invention is to provide a smokehouse airflow velocity regulating nozzle, which achieves airflow velocity regulation by rotating the baffle plate axially in the nozzle, thereby enabling stable regulation of the airflow inside the nozzle and saving the space occupied by the velocity regulating device in the nozzle arrangement gap, ensuring the nozzles are tightly arranged.

[0004] Another objective of this invention is to provide a control method for the airflow velocity adjustment nozzle of a smokehouse, which uses fuzzy control to adjust the airflow velocity of the nozzle, thereby quickly achieving uniform airflow velocity in the nozzle within the smokehouse and improving adjustment efficiency.

[0005] The technical solution provided by this invention is as follows:

[0006] A smokehouse airflow velocity regulating nozzle, comprising:

[0007] The nozzle body is a conical cylinder, and the small-diameter end of the nozzle body is the air outlet of the nozzle;

[0008] The connecting pipe is a cylindrical tube and is coaxially arranged with the nozzle body; one end of the connecting pipe is fixed inside the smokehouse and communicates with the positive pressure chamber of the smokehouse, and the other end is communicated with the large-diameter end of the nozzle body.

[0009] A movable base is fitted loosely onto the nozzle body;

[0010] Multiple connecting rods are circumferentially spaced around the outer wall of the connecting tube; one end of each connecting rod is hinged to the movable base.

[0011] Multiple flow-blocking plates are arranged in a one-to-one correspondence with the connecting rod, and there is a gap between adjacent flow-blocking plates; each flow-blocking plate includes a main body and a connecting part, wherein the connecting part is rod-shaped.

[0012] The main body is disposed inside the connecting tube, and the connecting tube has multiple through holes; one end of the connecting part is disposed toward the central axis of the nozzle body and is connected to the main body, and the other end passes through the through hole and is hinged to the other end of the connecting rod.

[0013] A first rotating shaft is fixedly installed on the connecting part. The first rotating shaft is parallel to the port of the connecting pipe and perpendicular to the connecting part. Both ends of the first rotating shaft are rotatably connected to the outer wall of the connecting pipe.

[0014] A drive mechanism for driving the movable base to move axially along the nozzle body;

[0015] When the movable base moves, it pushes the connecting rod to rotate, causing the first rotating shaft to rotate around its own central axis, so that the flow-blocking plate flips along the axial direction of the nozzle body, thereby changing the airflow velocity through the nozzle.

[0016] Preferably, the airflow velocity regulating nozzle for the smokehouse further includes:

[0017] The housing is fixed to the inner wall of the smokehouse, and the housing is sleeved on the outside of the connecting pipe. The movable base and the connecting rod are both located inside the housing.

[0018] Preferably, the drive mechanism includes:

[0019] Two drive gears are symmetrically arranged on both sides of the movable base;

[0020] The movable base is symmetrically fixed with racks on both sides, and the racks are arranged along the axial direction of the nozzle body; the drive gear and the racks mesh in a one-to-one correspondence.

[0021] Two drive gear shafts are provided, each corresponding to a drive gear. One end of each drive gear shaft is inserted into the housing and fixedly connected to the drive gear coaxially.

[0022] The motor and reduction mechanism are located outside the housing and connected to the other end of the two drive gear shafts for driving the two drive gear shafts to rotate.

[0023] The two drive gear shafts rotate at the same speed but in opposite directions.

[0024] Preferably, the deceleration mechanism includes:

[0025] The first gear is a cylindrical gear, and the first gear is coaxially fixedly connected to the drive shaft of the motor.

[0026] Wherein, the drive shaft of the motor is perpendicular to the drive gear shaft;

[0027] The second gear is a cylindrical gear and meshes with the first gear; the diameter of the second gear is larger than the diameter of the first gear.

[0028] The second gear shaft is coaxially and fixedly connected to the second gear.

[0029] Two third gears, which are bevel gears, are coaxially and fixedly connected to both ends of the second gear shaft;

[0030] The other ends of the two drive gear shafts are respectively coaxially fixedly connected to a fourth gear; the fourth gear is a bevel gear and meshes with the third gear.

[0031] Preferably, multiple bearings are fixedly installed on the inner walls of both sides of the housing, and the drive gear shaft is rotatably supported in the multiple bearings arranged on the same side.

[0032] Preferably, the movable base includes:

[0033] The mounting plate is circular, and the ports of the connecting pipes on the mounting plate are parallel.

[0034] One end of the rack is fixedly connected to the mounting plate;

[0035] Multiple brackets are fixedly installed on one side of the mounting plate and are arranged in a one-to-one correspondence with the connecting rods;

[0036] The second rotating shaft has its two ends fixedly connected to the bracket, and the second rotating shaft is parallel to its corresponding first rotating shaft.

[0037] One end of the connecting rod is sleeved on the second rotating shaft and can rotate around the second rotating shaft.

[0038] Preferably, the main body of the flow-blocking plate consists of an outer frame and a crossbeam;

[0039] The main body is formed by joining the bases of two isosceles triangular frames with equal base lengths; the legs of the two isosceles triangles form the quadrilateral outer frame; and the bases of the isosceles triangles constitute the crossbeam.

[0040] Preferably, the plurality of flow-blocking plates are evenly spaced along the circumference of the connecting pipe.

[0041] A method for controlling the airflow velocity regulating nozzle of a smokehouse, comprising using the aforementioned airflow velocity regulating nozzle and adjusting the airflow velocity of the nozzle through fuzzy control, including:

[0042] Establish a fuzzy control model;

[0043] The airflow velocity at the outlet of each nozzle in the smokehouse is collected according to the sampling period. The nozzle with the highest outlet airflow velocity is determined, and the average airflow velocity at the outlet of all nozzles in the smokehouse is calculated.

[0044] The velocity error of the nozzle is obtained by subtracting the airflow velocity at the nozzle outlet with the highest airflow velocity from the average airflow velocity.

[0045] The flow velocity error is input into the fuzzy control model, and the fuzzy control model outputs the flip angle of the baffle of the nozzle with the largest outlet airflow velocity.

[0046] Preferably, in the initial state, the angle between the baffle and the radial plane of the nozzle is 45°.

[0047] The beneficial effects of this invention are:

[0048] The smokehouse airflow velocity regulating nozzle provided by the present invention achieves airflow velocity regulation of the nozzle by rotating the baffle plate in the nozzle axis, which can realize the smooth regulation of airflow inside the nozzle and save the space occupied by the velocity regulating device in the nozzle arrangement gap, ensuring the tight arrangement of the nozzles.

[0049] The control method for adjusting the airflow velocity of the nozzle in a smokehouse provided by this invention uses fuzzy control to adjust the airflow velocity of the nozzle, which can quickly achieve uniform airflow velocity in the nozzle of the smokehouse and improve adjustment efficiency. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the nozzle arrangement inside the smokehouse described in this invention.

[0051] Figure 2 This is a schematic diagram of the nozzle body and drive mechanism described in this invention.

[0052] Figure 3 This is a schematic diagram of the overall structure of the nozzle described in this invention.

[0053] Figure 4 This is a schematic diagram of the flow-blocking plate described in this invention.

[0054] Figure 5 This is a schematic diagram of the structure of the movable base described in this invention.

[0055] Figure 6 This is a schematic diagram of the installation method of the motor and reduction mechanism described in this invention.

[0056] Figure 7 This is a flowchart of the control method for the airflow velocity adjustment nozzle of the smokehouse according to the present invention. Detailed Implementation

[0057] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0058] like Figure 1-6 As shown, this invention provides a smokehouse airflow velocity regulating nozzle, which mainly includes: a nozzle body 110, a connecting pipe 120, a movable base 130, a connecting rod 140, a flow-blocking plate 150, and a driving mechanism. The smokehouse 100 and the nozzle are arranged inside the smokehouse as follows... Figure 1 As shown.

[0059] like Figure 2-6 As shown, the nozzle body 110 is a conical cylinder, with its small-diameter end serving as the nozzle's outlet. The connecting pipe 120 is a cylindrical body, coaxially arranged with the nozzle body 110; one end of the connecting pipe 120 is fixed inside the smokehouse 100 and communicates with the positive pressure chamber of the smokehouse 100, while the other end is fixed and communicates with the large-diameter end of the nozzle body 110. The hot airflow in the positive pressure chamber of the smokehouse 100 enters the nozzle body 110 through the connecting pipe 120 and is then ejected.

[0060] The movable base 130 is loosely fitted onto the nozzle body 110. Multiple connecting rods 140 are circumferentially spaced around the outer wall of the connecting pipe 120; one end of each connecting rod 140 is hinged to the movable base 130. Multiple flow-blocking plates 150 are arranged correspondingly to each connecting rod 140, with gaps between adjacent flow-blocking plates 150. Each flow-blocking plate 150 includes a main body 151 and a connecting part 152; the connecting part 152 is rod-shaped. The main body 151 is disposed inside the connecting pipe 120, and multiple through holes 121 are formed in the wall of the connecting pipe 120; one end of the connecting part 152 faces the central axis of the nozzle body 110 and is connected to the main body 151, while the other end of the connecting part 152 passes through the through hole 121 and is hinged to the other end of the connecting rod 140.

[0061] A first rotating shaft 152a is fixedly mounted on the connecting part 152. The first rotating shaft 152a is parallel to the port (plane) of the connecting pipe, that is, parallel to the radial plane of the nozzle, and perpendicular to the connecting part 152. A pair of connecting blocks 122 protruding from the outer wall of the connecting pipe 120 are respectively provided on both sides of each through hole 121. The two ends of the first rotating shaft 152a are rotatably connected to the connecting blocks 122.

[0062] The drive mechanism is used to drive the movable base 130 to move axially along the nozzle body 110. When the movable base 110 moves axially along the nozzle body 110, it pushes the connecting rod 140 to rotate, causing the first rotating shaft 152a to rotate around its own central axis, causing the flow deflector 150 to flip axially along the nozzle body 110, changing the airflow passage area inside the nozzle, thereby changing the airflow velocity through the nozzle.

[0063] like Figure 4 As shown, in a preferred embodiment, the main body 151 of the flow deflector 150 is composed of an outer frame 151a and a crossbeam 151b. The main body 151 is formed by the bases of two isosceles triangular frames with equal base lengths joined together; the legs of the two isosceles triangles form the quadrilateral outer frame 151a, and the bases of the isosceles triangles constitute the crossbeam 151b. The apex of the isosceles triangle closest to the nozzle's central axis is acute, and the apex of the other isosceles triangle is obtuse; one end of the connecting portion 152 is connected to the vertex of the obtuse angle.

[0064] As a further preferred option, multiple baffles 150 are evenly spaced along the circumference of the connecting pipe 120 to ensure the stability of airflow regulation.

[0065] In this embodiment, the nozzle also includes a housing 160, which is fixed on the inner wall of the smokehouse 100. The housing 160 is sleeved on the outside of the connecting pipe 120, and the movable base 130 and the connecting rod 140 are both located inside the housing 160.

[0066] The driving mechanism includes: a drive gear 210, a drive gear shaft 220, a motor, and a reduction mechanism. Two drive gears 210 are symmetrically arranged on both sides of the movable base 130. Racks 131 are symmetrically fixed on both sides of the movable base 130, and the racks 131 are arranged along the axial direction of the nozzle body 110; the drive gears 210 and racks 131 mesh with each other. Two drive gear shafts 220 are arranged correspondingly to the drive gears 210. One end of each drive gear shaft 220 is inserted into the housing 160 and coaxially fixedly connected to the drive gear 210, while the other end is located outside the housing 160. The motor and reduction mechanism are located outside the housing 160 and are simultaneously connected to the other ends of the two drive gear shafts 220, used to drive the two drive gear shafts 220 to rotate. The two drive gear shafts 220 rotate at the same speed but in opposite directions.

[0067] As a preferred embodiment, the reduction mechanism includes: a first gear 231, a second gear 232, a second gear shaft 233, and a third gear 234.

[0068] The first gear 231 is a cylindrical gear, coaxially fixedly connected to the drive shaft of the motor. The drive shaft of the motor is perpendicular to the drive gear shaft 220. The second gear 232 is a cylindrical gear and meshes with the first gear 231; the diameter of the second gear 232 is larger than the diameter of the first gear 231. The second gear 232 is coaxially fixedly connected to the middle position of the second gear shaft 233. Two third gears 234 are bevel gears, coaxially fixedly connected to both ends of the second gear shaft 233. A fourth gear 235 is coaxially fixedly connected to the other end of each of the two drive gear shafts 220; the fourth gear 235 is a bevel gear and meshes with the third gears 234; the axes of the fourth gear 235 and the third gears 234 are perpendicular. Multiple bearings 236 are fixedly installed on the inner walls of both sides of the housing 160, and the drive gear shaft 220 is rotatably supported in the bearings 236 arranged on the same side. Torque is increased by the larger transmission ratio between the first gear 231 and the second gear 232, and graded transmission and transmission between intersecting shafts are completed by two bevel gears (the third gear 234 and the fourth gear 235). Two transmission mechanisms are symmetrically arranged on both sides of the movable base 130, which can reduce transmission loss and extend service life.

[0069] like Figure 5 As shown, as a further preferred embodiment, the movable base 130 includes: a mounting plate 130a, a bracket 130b, and a second rotating shaft 130c. The mounting plate 130a is annular and coaxially fitted onto the outside of the nozzle body 110, and is parallel to the port of the connecting pipe 120; wherein, one end of the rack 131 is fixedly connected to the mounting plate 130a, and the other end extends toward the small-diameter end of the nozzle. Multiple brackets 130b are fixedly disposed on the top of the mounting plate 131, and are arranged one-to-one with the connecting rod 140. The bracket 130b includes two connecting bodies symmetrically disposed on both sides of the connecting rod 140, and the two ends of the second rotating shaft 130c are respectively fixedly connected to the two connecting bodies of the bracket 130b, and the second rotating shaft 130c is parallel to the corresponding first rotating shaft 152a. wherein, one end of the connecting rod 140 is sleeved on the second rotating shaft 130c and can rotate around the second rotating shaft 130c.

[0070] like Figure 6 As shown, in this embodiment, the motor 240 and the reduction mechanism are both located outside the smokehouse 100. One end of the drive gear shaft 220 passes through the smokehouse wall and the shell 160 of the smokehouse 100 in sequence and is connected to the drive gear 210 inside the shell. A motor mounting base 101 is provided on the outside of the smokehouse 100 for mounting and fixing the motor 240 and the reduction mechanism.

[0071] like Figure 7As shown, the present invention also provides a control method for the airflow velocity adjustment nozzle of a smokehouse, which adjusts the airflow velocity of the nozzle through fuzzy control. The specific process is as follows.

[0072] A fuzzy control model is constructed as the control method for the flow rate regulation system. A wind speed sensor is placed 25 cm directly below the outlet of each nozzle. In one embodiment, there are a total of 8 nozzles (labeled 1-8) and 8 sensors (labeled AH). To avoid false detection problems caused by sensor failure, a self-test function for the sensors needs to be added. The device can only enter the fuzzy controller module after passing the sensor self-test.

[0073] The wind speed sensor detects that the nozzle with the maximum airflow velocity is number x. The airflow velocity v at the outlet of nozzle x is compared. x The average velocity v of the other seven.

[0074] Input error v x -v = e to the airflow velocity regulation system, where e is in m / s. If the detected airflow velocity range at the outlet (the difference between the airflow velocity at the nozzle outlet with the maximum airflow velocity and the airflow velocity at the nozzle outlet with the minimum airflow velocity) is less than or equal to 0.3 m / s, then control is exited. The input discrete universe of discourse is the physical universe, e = [-3, -2, -1, 0, 1, 2, 3]. Table 1 shows the fuzzy set of the input variables.

[0075] Table 1

[0076]

[0077]

[0078] The fuzzy control model outputs the flip angle 'a' of the choke, where 'a' is in degrees (°). The output discrete universe of discourse is the physical domain. The physical domain a = [-15, -12, -9, -6, -3, 0, 3, 6, 9, 12, 15]. Table 2 shows the fuzzy set of the output.

[0079] Table 2

[0080]

[0081] Here, the flip angle 'a' is the flip angle of the baffle relative to its initial angle. Experiments have verified that the baffle can smoothly regulate the airflow speed when it forms an angle of 30° to 55° with the radial plane of the nozzle. Therefore, in this embodiment, the initial angle of the baffle is set to 45°, meaning that in the initial state, the angle between the baffle and the radial plane of the nozzle is 45°. A positive flip angle occurs when the main body of the baffle flips towards the air inlet of the connecting pipe, and a negative flip angle occurs when it flips away from the inlet.

[0082] Fuzzy rule establishment:

[0083] Terminology: PB stands for positive large; PM stands for positive medium; PS stands for positive small; ZO stands for zero; NS stands for negative small; NM stands for negative medium; NB stands for negative large.

[0084] If error e corresponds to rule PB, then the change in the angle of the flow choke corresponds to rule PB.

[0085] If error e corresponds to rule PM, then the change in the angle of the choke plate also corresponds to rule PM.

[0086] If error e corresponds to rule PS, then the change in the angle of the flow choke corresponds to rule PS.

[0087] If error e corresponds to rule ZO, then the change in the angle of the choke plate corresponds to rule ZO.

[0088] If error e corresponds to rule NS, then the change in the angle of the flow choke plate also corresponds to rule NS.

[0089] If error e corresponds to rule NM, then the change in the angle of the choke plate also corresponds to rule NM.

[0090] If error e corresponds to rule NB, then the change in the angle of the choke plate corresponds to rule NB.

[0091] The fuzzy reasoning method adopts the Mamdani direct reasoning method; the inverse fuzzification method adopts the centroid method.

[0092] The drive mechanism adjusts the flip angle of the baffle plate of the nozzle with the maximum airflow velocity based on the output flip angle. Then, it enters the next sampling cycle and performs the next round of adjustment.

[0093] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for controlling the airflow velocity adjustment nozzle of a smokehouse, characterized in that, The smokehouse airflow rate regulating nozzles used include: The nozzle body is a conical cylinder, and the small-diameter end of the nozzle body is the air outlet of the nozzle; The connecting pipe is a cylindrical tube and is coaxially arranged with the nozzle body; one end of the connecting pipe is fixed inside the smokehouse and communicates with the positive pressure chamber of the smokehouse, and the other end is communicated with the large-diameter end of the nozzle body. A movable base is fitted loosely onto the nozzle body; Multiple connecting rods are circumferentially spaced around the outer wall of the connecting tube; one end of each connecting rod is hinged to the movable base. Multiple flow-blocking plates are arranged in a one-to-one correspondence with the connecting rod, and there is a gap between adjacent flow-blocking plates; each flow-blocking plate includes a main body and a connecting part, wherein the connecting part is rod-shaped. The main body is disposed inside the connecting tube, and the connecting tube has multiple through holes; one end of the connecting part is disposed toward the central axis of the nozzle body and is connected to the main body, and the other end passes through the through hole and is hinged to the other end of the connecting rod. A first rotating shaft is fixedly installed on the connecting part. The first rotating shaft is parallel to the port of the connecting pipe and perpendicular to the connecting part. Both ends of the first rotating shaft are rotatably connected to the outer wall of the connecting pipe. A drive mechanism for driving the movable base to move axially along the nozzle body; When the movable base moves, it pushes the connecting rod to rotate, causing the first rotating shaft to rotate around its own central axis, so that the flow-blocking plate flips along the axial direction of the nozzle body, changing the airflow velocity through the nozzle. The airflow velocity of the nozzle is adjusted using fuzzy control methods, including: Establish a fuzzy control model; The airflow velocity at the outlet of each nozzle in the smokehouse is collected according to the sampling period. The nozzle with the highest outlet airflow velocity is determined, and the average airflow velocity at the outlet of all nozzles in the smokehouse is calculated. The velocity error of the nozzle is obtained by subtracting the airflow velocity at the nozzle outlet with the highest airflow velocity from the average airflow velocity. The flow velocity error is input into the fuzzy control model, and the fuzzy control model outputs the flip angle of the baffle of the nozzle with the largest outlet airflow velocity.

2. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 1, characterized in that, In the initial state, the angle between the baffle and the radial plane of the nozzle is 45°.

3. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 2, characterized in that, The nozzle also includes: The housing is fixed to the inner wall of the smokehouse, and the housing is sleeved on the outside of the connecting pipe. The movable base and the connecting rod are both located inside the housing.

4. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 3, characterized in that, The drive mechanism includes: Two drive gears are symmetrically arranged on both sides of the movable base; The movable base is symmetrically fixed with racks on both sides, and the racks are arranged along the axial direction of the nozzle body; the drive gear and the racks mesh in a one-to-one correspondence. Two drive gear shafts are provided, each corresponding to a drive gear. One end of each drive gear shaft is inserted into the housing and fixedly connected to the drive gear coaxially. The motor and reduction mechanism are located outside the housing and connected to the other end of the two drive gear shafts for driving the two drive gear shafts to rotate. The two drive gear shafts rotate at the same speed but in opposite directions.

5. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 4, characterized in that, The deceleration mechanism includes: The first gear is a cylindrical gear, and the first gear is coaxially fixedly connected to the drive shaft of the motor. Wherein, the drive shaft of the motor is perpendicular to the drive gear shaft; The second gear is a cylindrical gear and meshes with the first gear; the diameter of the second gear is larger than the diameter of the first gear. The second gear shaft is coaxially and fixedly connected to the second gear. Two third gears, which are bevel gears, are coaxially and fixedly connected to both ends of the second gear shaft; The other ends of the two drive gear shafts are respectively coaxially fixedly connected to a fourth gear; the fourth gear is a bevel gear and meshes with the third gear.

6. The method for controlling the airflow velocity regulating nozzle of a smokehouse according to claim 4 or 5, characterized in that, Multiple bearings are fixedly installed on the inner walls of both sides of the housing, and the drive gear shaft is rotatably supported in the multiple bearings arranged on the same side.

7. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 6, characterized in that, The mobile base includes: The mounting plate is circular, and the ports of the connecting pipes on the mounting plate are parallel. One end of the rack is fixedly connected to the mounting plate; Multiple brackets are fixedly installed on one side of the mounting plate and are arranged in a one-to-one correspondence with the connecting rods; The second rotating shaft has its two ends fixedly connected to the bracket, and the second rotating shaft is parallel to its corresponding first rotating shaft. One end of the connecting rod is sleeved on the second rotating shaft and can rotate around the second rotating shaft.

8. The method for controlling the airflow velocity adjustment nozzle of a smokehouse according to claim 7, characterized in that, The main body of the flow-blocking plate consists of an outer frame and a crossbeam; The main body is formed by joining the bases of two isosceles triangular frames with equal base lengths; the legs of the two isosceles triangles form the quadrilateral outer frame; and the bases of the isosceles triangles constitute the crossbeam.

9. The method for controlling the airflow velocity regulating nozzle of a smokehouse according to claim 8, characterized in that, Multiple flow-blocking plates are evenly spaced along the circumference of the connecting pipe.

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