Cutting device for improving the flatness of cutting surface of ventilation duct

Abstract

The embodiment of the present application provides a cutting device for improving the flatness of the cut surface of a ventilation duct, and relates to the technical field of ventilation duct processing. The cutting device for improving the flatness of the cut surface of a ventilation duct comprises: a mounting mechanism, a driving mechanism, the driving mechanism being located at the lower end of the mounting mechanism, a clamping transmission mechanism, the clamping transmission mechanism being located inside the mounting mechanism, the driving mechanism being located at the lower end of the clamping transmission mechanism, the driving mechanism driving the clamping transmission mechanism to reciprocate up and down inside the mounting mechanism, and a cutting mechanism, the cutting mechanism being arranged inside the upper end of the mounting mechanism, the clamping transmission mechanism driving the cutting mechanism to move up and down. The synchronous adjustment of the cutting and clamping positions is realized, which can not only reduce the vibration generated during pipe cutting and improve the pipe cutting quality, but also automatically transmit the cut pipe to the outside of the cutting tube, effectively avoiding the deformation of the cut pipe.

Description

Technical Field

[0001] The present application relates to the technical field of ventilation duct processing, and in particular to a cutting device for improving the flatness of a cutting surface of a ventilation duct. Background Art

[0002] Ventilation ducts are pipe systems used to transport air, and the wall thickness of the ventilation duct determines its purpose. Thinner-walled ventilation ducts are suitable for apartments, homes, and offices, etc. These places usually require ventilation to maintain air circulation, but do not need to withstand a lot of wind pressure or weight. In order to install and maintain these duct systems, cutting ventilation ducts is an essential step. The cut duct materials are recycled and used to make small parts or other related assemblies, thereby reducing material waste and improving resource utilization efficiency.

[0003] When the existing cutting device cuts the front end of the ventilation duct, the duct clamp is mostly adjusted to the rear end of the duct and fixes the duct, and the cut part will mostly fall on the surface of the workbench under the action of gravity, which is not convenient for automatic transfer and unloading of the cut duct. At the same time, since the wall of the ventilation duct is relatively thin, the cut duct part may be deformed due to free fall, which is not conducive to the recycling of duct materials.

[0004] When the cutting knife is about to complete the cutting from top to bottom, the connection area at the pipe incision begins to decrease and the connection strength will weaken. Due to the asymmetric force on the remaining uncut part of the pipe, the pipe will vibrate during the cutting process, making the cutting edge uneven or burred, affecting the cutting quality, further affecting the precise assembly of the pipe, and increasing the difficulty of installation. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a cutting device for improving the flatness of the cut surface of the ventilation duct, and the cutting device for improving the flatness of the cut surface of the ventilation duct is started by the first servo motor to rotate clockwise or counterclockwise. Firstly, the synchronous adjustment of the cutting and clamping positions is realized, which can not only reduce the vibration generated during pipe cutting and improve the pipe cutting quality, but also automatically transfer the cut pipe to the outside of the cutting tube, effectively avoiding the deformation of the cut pipe. Secondly, the up and down movement positions of the cutting mechanism and the clamping transmission mechanism can be adjusted by the clockwise rotation of the first servo motor, thereby realizing continuous cutting of multiple positions of the ventilation duct, and the cut pipe is transferred to the outside of the cutting tube through the clamping transmission mechanism, effectively avoiding the cutting. The pipe that comes down will be deformed, which is beneficial to the recycling of pipe materials. Thirdly, the first servo motor can rotate clockwise to make the cutting mechanism and the clamping transmission mechanism move up and down synchronously, so that when the cutting mechanism cuts the pipe, the clamping transmission mechanism can move to the corresponding cutting position of the pipe, ensuring the stability of the pipe during the cutting process, making the cutting edge smooth and not prone to burrs, thereby improving the cutting quality of the pipe. Fourthly, the first servo motor can rotate counterclockwise to make the cutting mechanism start from the inner wall of the pipe to perform circular cutting on the pipe, and more accurately control the force and position of the cutting knife during the cutting process, avoiding excessive pressure to cause unnecessary deformation or damage to the pipe wall, and avoiding damage or influence on the outer surface, thereby protecting the overall structure and appearance of the pipe.

[0006] A cutting device for improving the flatness of a cutting surface of a ventilation duct according to an embodiment of the present application includes:

[0007] The mounting mechanism comprises a cutting cylinder, a positioning seat and a first electric telescopic rod, wherein the positioning seat is fixedly connected to the middle of the inner bottom surface of the cutting cylinder, and the middle of the lower end of the cutting cylinder is fixedly connected to the positioning cylinder;

[0008] A driving mechanism, the driving mechanism is located at the lower end of the mounting mechanism, the driving mechanism comprises an assembly frame, a first servo motor, a rotating ring, a first ratchet, a first connecting circular plate, a first pawl, a second ratchet, a second connecting circular plate and a second pawl, the assembly frame and the first servo motor are both fixedly connected to the lower part of the outer wall of the rear end of the cutting cylinder, the inner wall of the assembly frame is respectively fixedly connected with a plurality of assembly plates, the inner walls of the assembly plates are both fixedly connected with assembly rings, the first ratchet and the second ratchet are respectively arranged at the upper end of the assembly ring, the first ratchet is located at the upper part of the second ratchet, the outer wall of the first ratchet is fixedly connected with the first driving wheel, the outer wall of the second ratchet is fixedly connected with the second driving wheel, the first connecting circular plate and the second connecting circular plate are both fixedly connected to the output end of the first servo motor, the first connecting circular plate is located in the middle of the first ratchet, the second connecting circular plate is located in the middle of the second ratchet, a first pawl is arranged on one side of the upper part of the first connecting circular plate, and a second pawl is arranged on one side of the upper part of the second connecting circular plate;

[0009] The transmission mechanism of the present invention is a transmission mechanism which is arranged inside the mounting mechanism, the driving mechanism is arranged at the lower end of the transmission mechanism of the present invention, the driving mechanism drives the transmission mechanism of the present invention to reciprocate up and down inside the mounting mechanism, the transmission mechanism of the present invention comprises a transmission long tube, a third driving wheel, a reciprocating threaded cylinder, a lower mounting disc, an upper mounting disc, a mounting cover and a reciprocating threaded rod, the transmission long tube is rotatably connected to the inner wall of the positioning cylinder, the upper end of the transmission long tube extends to the inside of the cutting cylinder, a driving ring groove is provided on the outer wall of the transmission long tube near the lower end, the driving ring groove and the outer wall of the first driving wheel are provided with a second transmission belt, the second transmission belt is provided at the upper end of the second driving wheel, the third driving wheel is fixedly connected to the outer wall of the lower end of the transmission long tube, the reciprocating threaded cylinder is provided on the outer wall of the upper end of the transmission long tube, and the lower end of the reciprocating threaded cylinder is provided with a cylindrical threaded sleeve;

[0010] The upper surface of the cylindrical threaded sleeve is fixedly connected with three connecting rods, the lower surface of the lower mounting disc is fixedly connected with the upper surface of the connecting rod, the upper mounting disc is arranged on the upper end of the lower mounting disc, the upper surface of the lower mounting disc and the lower surface of the upper mounting disc are respectively fixedly connected with three second electric telescopic rods, the output ends of the second electric telescopic rods are fixedly connected with an arc mounting plate, the upper surface of the lower mounting disc and the lower surface of the upper mounting disc are respectively fixedly connected with a plurality of guide seats, one side of the arc mounting plate is fixedly connected with a second arc fixing plate, the three mounting covers are fixedly connected to the outer wall of the upper end of the cutting cylinder, the reciprocating threaded rods are rotatably connected to the inner top of the mounting cover, the rod bodies of the reciprocating threaded rods are sleeved with rectangular threaded sleeves, the side of the rectangular threaded sleeves close to the cutting cylinder is fixedly connected with a fixing cover, the end of the fixing cover away from the middle of the cutting cylinder is fixedly connected with a third electric telescopic rod, and the output ends of the third electric telescopic rods are fixedly connected with a third arc fixing plate;

[0011] The cutting mechanism is arranged inside the upper end of the mounting mechanism, the clamping transmission mechanism drives the cutting mechanism to move up and down, and the driving mechanism drives the cutting mechanism to rotate, so as to realize the annular cutting of the ventilation duct.

[0012] According to some embodiments of the present application, three first electric telescopic rods are fixedly connected to the outer wall of the positioning tube, and the output ends of the first electric telescopic rods are fixedly connected to the first arc-shaped fixing plate.

[0013] According to some embodiments of the present application, three limiting grooves are opened on the bottom surface of the positioning seat, the middle part of the lower surface of the first arc-shaped fixing plate is fixedly connected to the limiting plate, the limiting plates slide inside the limiting grooves, and the middle part of the outer wall of the cutting tube is fixedly connected to three supporting legs.

[0014] According to some embodiments of the present application, the first pawl cooperates with the first ratchet, and the second pawl cooperates with the second ratchet.

[0015] According to some embodiments of the present application, a rotating ring is fixedly connected to the upper end of the assembly ring, and rotating grooves are provided on the lower surfaces of the first ratchet and the second ratchet, and the rotating grooves slide on the outer wall of the rotating ring.

[0016] According to some embodiments of the present application, the lower end of the reciprocating threaded rod passes through the mounting cover and is fixedly connected to the first rotating rod, the lower end of the first rotating rod is fixedly connected to the first cylindrical gear, the outer wall of the lower end of the cutting cylinder is fixedly connected to three semi-arc guide plates, the upper ends of the semi-arc guide plates are slidably connected to a gear ring, the inner wall of the gear ring is fixedly connected to a plurality of first teeth, a second rotating rod is provided on one side of the lower end of the cutting cylinder, the upper end of the second rotating rod is fixedly connected to the second cylindrical gear, the first cylindrical gear and the second cylindrical gear are meshed with the first teeth, the lower end of the second rotating rod is fixedly connected to the first driven wheel, and the outer walls of the first driven wheel and the third driving wheel are sleeved with a first transmission belt.

[0017] According to some embodiments of the present application, three sliding rods are provided on the inner bottom of the cutting cylinder, the inner walls of the cylindrical threaded sleeve are respectively fixedly connected with sliding plates, and one side of the sliding plate is slidably connected to the outer wall of the sliding rod.

[0018] According to some embodiments of the present application, the cutting mechanism includes a third rotating rod, a second driven wheel, a connecting ring and a driving ring plate, the third rotating rod is arranged in the middle of the transmission long tube, the outer walls of the upper and lower ends of the third rotating rod are fixedly connected to bearing sleeves, the outer walls of the bearing sleeves are fixedly connected to the inner wall of the transmission long tube, the second driven wheel is fixedly connected to the outer wall of the lower end of the third rotating rod, the outer walls of the second driven wheel and the second driving wheel are sleeved with a third transmission belt, the upper surface of the lower mounting disc and the lower surface of the upper mounting disc are fixedly connected to a connecting ring, the outer walls of the connecting rings are fixedly connected to cylindrical roller bearings, the outer walls of the cylindrical roller bearings are fixedly connected to the driving ring plate, the inner wall of the driving ring plate is fixedly connected to a plurality of second teeth, the outer wall of the upper end of the third rotating rod is fixedly connected to a plurality of third teeth, and the second teeth and the third teeth are meshed with each other.

[0019] According to some embodiments of the present application, one side of the driving ring plate is fixedly connected to a mounting frame, an inner wall of the mounting frame is fixedly connected to a fourth electric telescopic rod, an output end of the fourth electric telescopic rod is fixedly connected to a mounting frame, a second servo motor is provided at the lower portion of one side of the mounting frame, and a cutting blade is fixedly connected to the output end of the second servo motor.

[0020] The beneficial effects of the present application are as follows: when in use, firstly, the ventilation duct to be cut is placed inside the installation mechanism, and then the driving mechanism is started to rotate clockwise, so that the cutting mechanism and the clamping transmission mechanism can move up and down synchronously, and then when the cutting mechanism cuts the duct, the clamping transmission mechanism can move to the cutting position corresponding to the duct, so that the clamping transmission mechanism can perform staggered clamping and support on the inner wall and the outer wall of the duct cutting position, effectively reducing the vibration generated during duct cutting. When the cutting is completed, the start and stop of the corresponding second electric telescopic rod and the third electric telescopic rod are controlled, and then the transmission long tube is rotated counterclockwise, so that the cut duct can be automatically transmitted to the outside of the cutting barrel, effectively avoiding the deformation of the cut duct, wherein, by starting the first servo motor to rotate clockwise or counterclockwise, firstly, the synchronous adjustment of the cutting and clamping positions is realized, which can not only reduce the vibration generated during duct cutting and improve the duct cutting quality, but also automatically transmit the cut duct to the outside of the cutting barrel, effectively avoiding the deformation of the cut duct. Phenomenon, secondly, the up and down moving positions of the cutting mechanism and the clamping transmission mechanism can be adjusted by rotating the first servo motor clockwise, so as to realize continuous cutting of multiple positions of the ventilation duct, and the cut pipe can be transmitted to the outside of the cutting cylinder through the clamping transmission mechanism, effectively avoiding the deformation of the cut pipe, which is beneficial to the recycling of pipe materials, thirdly, the cutting mechanism and the clamping transmission mechanism can be synchronously moved up and down by rotating the first servo motor clockwise, so that when the cutting mechanism cuts the pipe, the clamping transmission mechanism can move to the corresponding cutting position of the pipe, ensuring the stability of the pipe during the cutting process, making the cutting edge smooth and not prone to burrs, and improving the cutting quality of the pipe, fourthly, the first servo motor can be rotated counterclockwise, so that the cutting mechanism can perform circular cutting on the pipe starting from the inner wall of the pipe, and the force and position of the cutting knife during the cutting process can be more accurately controlled, avoiding excessive pressure from causing unnecessary deformation or damage to the pipe wall, and also avoiding damage or influence on the outer surface, protecting the overall structure and appearance of the pipe.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1is a schematic diagram of the three-dimensional structure of a cutting device for improving the flatness of a cutting surface of a ventilation duct according to an embodiment of the present application;

[0024] Figure 2 is a partial cross-sectional structural schematic diagram of a mounting mechanism according to an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of a three-dimensional structure of a driving mechanism according to an embodiment of the present application;

[0026] Figure 4 is a schematic diagram of the assembly structure of the assembly plate, the assembly ring, the rotating ring, the first ratchet and the rotating groove according to an embodiment of the present application;

[0027] Figure 5 is a partial structural schematic diagram of a clamping transmission mechanism according to an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of the installation structure of the first rotating rod and the installation cover according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of the overall structure of the clamping transmission mechanism according to an embodiment of the present application;

[0030] Figure 8 is a schematic diagram of the assembly structure of the driving mechanism and the clamping transmission mechanism according to an embodiment of the present application;

[0031] Fig. 9 is a schematic diagram of the three-dimensional structure of a cutting mechanism according to an embodiment of the present application;

[0032] Fig.10 is a schematic diagram of a partial cross-sectional structure of a cutting mechanism according to an embodiment of the present application;

[0033] Fig.11 is a schematic diagram of the three-dimensional structure of a driving mechanism, a clamping transmission mechanism and a cutting mechanism according to an embodiment of the present application;

[0034] Fig.12 It is a structural schematic diagram of a cutting device for improving the flatness of the cut surface of a ventilation duct according to an embodiment of the present application, in which a cutting cylinder is removed.

[0035] Icons: 1. Installation mechanism; 101. Cutting cylinder; 102. Positioning seat; 103. Positioning cylinder; 104. First electric telescopic rod; 105. First arc-shaped fixing plate; 106. Limiting groove; 107. Limiting plate; 108. Support leg; 2. Driving mechanism; 201. Assembly frame; 202. First servo motor; 203. Assembly plate; 204. Assembly ring; 205. Rotating ring; 206. First ratchet; 207. Rotating groove; 208. First connecting circular plate; 209. First a ratchet; 210, a second ratchet; 211, a second connecting circular plate; 212, a second ratchet; 213, a first driving wheel; 214, a second driving wheel; 3, a clamping transmission mechanism; 301, a transmission long tube; 302, a driving ring groove; 303, a third driving wheel; 304, a reciprocating threaded cylinder; 305, a cylindrical threaded sleeve; 306, a connecting rod; 307, a lower mounting disc; 308, an upper mounting disc; 309, a second electric telescopic rod; 310, an arc-shaped mounting plate; 311, a guide seat; 312, mounting cover; 313, reciprocating threaded rod; 314, rectangular threaded sleeve; 315, fixed cover; 316, third electric telescopic rod; 317, first rotating rod; 318, first cylindrical gear; 319, semi-arc guide plate; 320, gear ring; 321, first tooth; 322, second rotating rod; 323, second cylindrical gear; 324, first driven wheel; 325, first transmission belt; 326, second transmission belt; 327, second arc fixed plate; 328 , third arc-shaped fixed plate; 329, sliding rod; 330, sliding plate; 4, cutting mechanism; 401, third rotating rod; 402, bearing sleeve; 403, second driven wheel; 404, third transmission belt; 405, connecting ring; 406, cylindrical roller bearing; 407, driving ring plate; 408, second teeth; 409, third teeth; 410, mounting frame; 411, fourth electric telescopic rod; 412, mounting frame; 413, second servo motor; 414, cutting blade. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0037] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] The following describes a cutting device for improving the flatness of a cut surface of a ventilation duct according to an embodiment of the present application with reference to the accompanying drawings.

[0045] like Figure 1-Figure 12 As shown, a cutting device for improving the flatness of a cutting surface of a ventilation duct according to an embodiment of the present application includes: a mounting mechanism 1, a driving mechanism 2, a clamping and transmission mechanism 3, and a cutting mechanism 4.

[0046] like Figure 1 As shown, the mounting mechanism 1, the driving mechanism 2, the driving mechanism 2 is located at the lower end of the mounting mechanism 1, the clamping and transmission mechanism 3, the clamping and transmission mechanism 3 is located inside the mounting mechanism 1, the driving mechanism 2 is located at the lower end of the clamping and transmission mechanism 3, the driving mechanism 2 drives the clamping and transmission mechanism 3 to reciprocate up and down inside the mounting mechanism 1, the cutting mechanism 4, the cutting mechanism 4 is arranged inside the upper end of the mounting mechanism 1, the clamping and transmission mechanism 3 drives the cutting mechanism 4 to move up and down, and the driving mechanism 2 drives the cutting mechanism 4 to rotate, so as to realize the annular cutting of the ventilation duct.

[0047] When in use, first put the ventilation duct to be cut into the interior of the installation mechanism 1, and then start the driving mechanism 2 to rotate it clockwise, so that the cutting mechanism 4 and the clamping and transmission mechanism 3 can move up and down synchronously, and then when the cutting mechanism 4 cuts the pipe, the clamping and transmission mechanism 3 can move to the corresponding cutting position of the pipe, so that the clamping and transmission mechanism 3 can perform staggered clamping and support on the inner wall and the outer wall of the pipe cutting position, effectively reducing the vibration generated during pipe cutting. When the cutting is completed, the corresponding second electric telescopic rod 309 and the third electric telescopic rod 316 are controlled to start and stop, and then the transmission long tube 301 is rotated counterclockwise, so that the cut pipe can be automatically transmitted to the outside of the cutting barrel, effectively avoiding the deformation of the cut pipe.

[0048] like Figure 2As shown, the mounting mechanism 1 includes a cutting cylinder 101, a positioning seat 102 and a first electric telescopic rod 104. The positioning seat 102 is fixedly connected to the middle part of the inner bottom surface of the cutting cylinder 101. The outer wall of the positioning cylinder 103 is fixedly connected with three first electric telescopic rods 104. The output ends of the first electric telescopic rods 104 are fixedly connected with first arc-shaped fixing plates 105. The bottom surface of the positioning seat 102 is provided with three limiting grooves 106. The middle part of the lower surface of the first arc-shaped fixing plate 105 is fixedly connected with a limiting plate 107. The limiting plates 107 slide inside the limiting grooves 106. The middle part of the outer wall of the cutting cylinder 101 is fixedly connected with three supporting legs 108. Before cutting the ventilation duct, the ventilation duct is firstly placed into the interior of the cutting cylinder 101. At this time, by starting the first electric telescopic rod 104, the first arc-shaped fixing plate 105 can position the lower part of the ventilation duct, which brings convenience to the next step of cutting the ventilation duct.

[0049] like Figure 3 and Figure 41 , the driving mechanism 2 includes an assembly frame 201, a first servo motor 202, a rotating ring 205, a first ratchet 206, a first connecting circular plate 208, a first pawl 209, a second ratchet 210, a second connecting circular plate 211 and a second pawl 212. The assembly frame 201 and the first servo motor 202 are fixedly connected to the lower part of the outer wall of the rear end of the cutting cylinder 101. The inner wall of the assembly frame 201 is respectively fixedly connected with a plurality of assembly plates 203. The inner walls of the assembly plates 203 are respectively fixedly connected with assembly rings 204. The first ratchet 206 and the second ratchet 210 are respectively arranged at the upper end of the assembly ring 204. The wheel 206 is located at the upper part of the second ratchet 210, the outer wall of the first ratchet 206 is fixedly connected to the first driving wheel 213, the outer wall of the second ratchet 210 is fixedly connected to the second driving wheel 214, the first connecting circular plate 208 and the second connecting circular plate 211 are both fixedly connected to the output end of the first servo motor 202, the first connecting circular plate 208 is located in the middle of the first ratchet 206, the second connecting circular plate 211 is located in the middle of the second ratchet 210, a first pawl 209 is provided on one side of the upper part of the first connecting circular plate 208, a second pawl 212 is provided on one side of the upper part of the second connecting circular plate 211, and the first ratchet 208 is fixedly connected to the output end of the first servo motor 202. The pawl 209 cooperates with the first ratchet 206, and the second pawl 212 cooperates with the second ratchet 210. The upper end of the assembly ring 204 is fixedly connected to the rotating ring 205. The lower surfaces of the first ratchet 206 and the second ratchet 210 are provided with a rotating groove 207. The rotating groove 207 slides on the outer wall of the rotating ring 205. Specifically, when the cutting position and the fixed position of the ventilation duct are adjusted, by starting the first servo motor 202 to rotate clockwise, the first connecting circular plate 208 can drive the first pawl 209 to rotate clockwise inside the first ratchet 206, thereby causing the first driving wheel 213 to drive the first driving wheel 213 to rotate clockwise. The second transmission belt 326 is driven to rotate. At this time, the transmission long tube 301 drives the reciprocating threaded cylinder 304 to rotate under the action of the driving ring groove 302. After the cutting position of the ventilation duct is located, when the cutting pipe needs to be cut, the first servo motor 202 is started to rotate counterclockwise, so that the second connecting circular plate 211 can drive the second pawl 212 to rotate counterclockwise inside the second ratchet wheel 210, and then the second driving wheel 214 can drive the third transmission belt 404 and the second driven wheel 403 to rotate. At this time, the third rotating rod 401 rotates counterclockwise, which further facilitates the cutting work of the ventilation duct.

[0050] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the clamping transmission mechanism 3 includes a transmission long tube 301, a third driving wheel 303, a reciprocating threaded cylinder 304, a lower mounting disc 307, an upper mounting disc 308, a mounting cover 312 and a reciprocating threaded rod 313. The middle part of the lower end of the cutting cylinder 101 is fixedly connected with the positioning cylinder 103. The transmission long tube 301 is rotatably connected to the inner wall of the positioning cylinder 103. The upper end of the transmission long tube 301 extends to the inside of the cutting cylinder 101. A driving ring groove 302 is provided on the outer wall of the transmission long tube 301 near the lower end. The driving ring groove 302 and the outer wall of the first driving wheel 213 are sleeved with a second transmission belt 326. The second transmission belt 326 is arranged at the upper end of the second driving wheel 214. The third driving wheel 303 is fixedly connected to the outer wall of the lower end of the transmission long tube 301. The reciprocating threaded cylinder 304 is arranged on the outer wall of the upper end of the transmission long tube 301. The lower end of the reciprocating threaded cylinder 304 is sleeved with a cylindrical threaded sleeve 305.

[0051] The upper surface of the cylindrical threaded sleeve 305 is fixedly connected with three connecting rods 306, the lower surface of the lower mounting disc 307 is fixedly connected to the upper surface of the connecting rod 306, the upper mounting disc 308 is arranged at the upper end of the lower mounting disc 307, the upper surface of the lower mounting disc 307 and the lower surface of the upper mounting disc 308 are respectively fixedly connected with three second electric telescopic rods 309, the output ends of the second electric telescopic rods 309 are fixedly connected with arc-shaped mounting plates 310, the upper surface of the lower mounting disc 307 and the lower surface of the upper mounting disc 308 are respectively fixedly connected with a plurality of guide seats 311, one side of the arc-shaped mounting plate 310 is fixedly connected with a second arc-shaped fixing plate 327, three mounting covers 312 are fixedly connected to the outer wall of the upper end of the cutting cylinder 101, and the reciprocating screw The threaded rods 313 are rotatably connected to the inner top of the mounting cover 312, the rod bodies of the reciprocating threaded rods 313 are sleeved with rectangular threaded sleeves 314, the side of the rectangular threaded sleeves 314 close to the cutting cylinder 101 is fixedly connected to a fixed cover 315, the end of the fixed cover 315 away from the middle of the cutting cylinder 101 is fixedly connected to a third electric telescopic rod 316, the output end of the third electric telescopic rod 316 is fixedly connected to a third arc-shaped fixed plate 328, the lower end of the reciprocating threaded rods 313 passes through the mounting cover 312 and is fixedly connected to a first rotating rod 317, the lower end of the first rotating rod 317 is fixedly connected to a first cylindrical gear 318, the outer wall of the lower end of the cutting cylinder 101 is fixedly connected to three semi-arc guide plates 319, the upper ends of the semi-arc guide plates 319 are slidably connected A gear ring 320 is connected, and a plurality of first teeth 321 are fixedly connected to the inner wall of the gear ring 320. A second rotating rod 322 is provided on one side of the lower end of the cutting cylinder 101. A second cylindrical gear 323 is fixedly connected to the upper end of the second rotating rod 322. The first cylindrical gear 318 and the second cylindrical gear 323 are meshed with the first teeth 321. A first driven wheel 324 is fixedly connected to the lower end of the second rotating rod 322. The outer walls of the first driven wheel 324 and the third driving wheel 303 are sleeved with a first transmission belt 325. Three sliding rods 329 are provided on the inner bottom of the cutting cylinder 101. The inner walls of the cylindrical threaded sleeves 305 are respectively fixedly connected with sliding plates 330. One side of the sliding plates 330 is slidably connected to the outer wall of the sliding rod 329. Specifically, When adjusting the cutting position and the fixing position of the ventilation duct, the driving mechanism 2 is used to rotate the transmission long tube 301 clockwise, and at this time, the reciprocating threaded cylinder 304 drives the cylindrical threaded sleeve 305 to move upward, and at the same time, the cylindrical threaded sleeve 305 drives the connecting rod 306, the lower mounting disc 307, the connecting ring 405, the cylindrical roller bearing 406, the driving ring plate 407 and the upper mounting disc 308 to move upward, and then when the cutting mechanism 4 reaches the specified cutting position, the first servo motor 202 is stopped so that it no longer rotates, and then the second electric telescopic rod 309 is started to make the arc-shaped mounting plate 310 drive the second arc-shaped fixing plate 327 to move slowly toward the inner wall of the ventilation duct until the second arc-shaped fixing plate 327 contacts and clamps the inner wall of the ventilation duct.At the same time, during the rotation of the transmission long tube 301, the third driving wheel 303 will drive the first driven wheel 324 to rotate through the first transmission belt 325. At this time, under the action of the second cylindrical gear 323, the gear ring 320 and the first tooth 321, the first cylindrical gear 318 and the first rotating rod 317 begin to rotate synchronously, and the reciprocating threaded rod 313 drives the rectangular threaded sleeve 314, the fixed cover 315, and the third electric telescopic rod 316 to move upward. At the same time, the rectangular threaded sleeve 314 will move up and down at the same speed as the cylindrical threaded sleeve 305. Then, by starting the third electric telescopic rod 316, the third arc-shaped fixed plate 328 can be clamped on the outer wall of the ventilation duct. At this time, the inner wall and the outer wall of the ventilation duct are staggered by the second arc-shaped fixed plate 327 and the third arc-shaped fixed plate 328, and at the same time, the cutting position of the cutting mechanism 4 is reserved to ensure the normal cutting work of the cutting blade 414. When the cutting blade 414 has finished cutting the ventilation duct, the second electric telescopic rod 309 on the surface of the lower mounting disc 307 is started to return to its original position, and the third electric telescopic rod 316 near the lower end is started to return to its original position. At this time, the cut portion of the ventilation duct is still clamped by the second arc-shaped fixing plate 327 and the third arc-shaped fixing plate 328 on the upper part, and the second arc-shaped fixing plate 327 and the third arc-shaped fixing plate 328 of the ventilation duct body have returned to their original positions. Then, the driving mechanism 2 is used to rotate the transmission long tube 301, and the cut ventilation duct is moved upward, which is convenient for the staff to collect the cut pipes. At the same time, under the rotation of the reciprocating threaded barrel 304 and the reciprocating threaded rod 313, the cylindrical threaded sleeve 305 and the rectangular threaded sleeve 314 will slowly move downward when they rise to the highest point, so as not to affect the clamping of the next ventilation duct and the transmission of the cut material.

[0052] like Fig. 9 , Fig.10 , Fig.11 and Fig.12The cutting mechanism 4 includes a third rotating rod 401, a second driven wheel 403, a connecting ring 405 and a driving ring plate 407. The third rotating rod 401 is arranged in the middle of the transmission long tube 301. The outer walls of the upper and lower ends of the third rotating rod 401 are fixedly connected with bearing sleeves 402. The outer walls of the bearing sleeves 402 are fixedly connected to the inner wall of the transmission long tube 301. The second driven wheel 403 is fixedly connected to the outer wall of the lower end of the third rotating rod 401. The outer walls of the second driven wheel 403 and the second driving wheel 214 are sleeved with a third transmission belt 404. The upper and lower mounting discs 307 are fixedly connected to the outer wall of the lower end of the third rotating rod 401. The surface and the lower surface of the upper mounting disk 308 are fixedly connected with a connecting ring 405, the outer wall of the connecting ring 405 is fixedly connected with a cylindrical roller bearing 406, the outer wall of the cylindrical roller bearing 406 is fixedly connected to the driving ring plate 407, the inner wall of the driving ring plate 407 is fixedly connected with a plurality of second teeth 408, the outer wall of the upper end of the third rotating rod 401 is fixedly connected with a plurality of third teeth 409, the second teeth 408 and the third teeth 409 are meshed with each other, one side of the driving ring plate 407 is fixedly connected with a mounting frame 410, the inner wall of the mounting frame 410 is fixedly connected There is a fourth electric telescopic rod 411, the output end of the fourth electric telescopic rod 411 is fixedly connected to a mounting frame 412, a second servo motor 413 is arranged at the lower part of one side of the mounting frame 412, and a cutting blade 414 is fixedly connected to the output end of the second servo motor 413. Specifically, after the cutting position of the ventilation duct is located, when it is necessary to cut the cutting duct, the third rotating rod 401 can drive the third tooth 409 to rotate by starting the first servo motor 202 to rotate counterclockwise, and at this time, the third tooth 409 will mesh with the second tooth 408, so that the driving The ring plate 407 starts to rotate on the surface of the connecting ring 405 under the action of the cylindrical roller bearing 406, and at the same time, the fourth electric telescopic rod 411 and the second servo motor 413 are started to enable the mounting frame 412 to drive the cutting blade 414 to reach the corresponding cutting depth. At this time, in the process of driving the ring plate 407 to rotate slowly in a circular shape, the cutting blade 414 also starts to rotate slowly, and starts to perform circular cutting on the ventilation duct from the inner wall of the ventilation duct, thereby effectively avoiding damage or influence on the outer surface of the ventilation duct by the cutting blade 414 during cutting, thereby protecting the overall structure and appearance of the duct.Among them, by starting the first servo motor 202 to rotate clockwise or counterclockwise, firstly, the synchronous adjustment of the cutting and clamping positions is realized, which can not only reduce the vibration generated during pipe cutting and improve the pipe cutting quality, but also automatically transmit the cut pipe to the outside of the cutting cylinder 101, effectively avoiding the deformation of the cut pipe. Secondly, the clockwise rotation of the first servo motor 202 can adjust the up and down movement positions of the cutting mechanism 4 and the clamping and transmission mechanism 3, thereby realizing continuous cutting of multiple positions of the ventilation duct, and transmitting the cut pipe to the outside of the cutting cylinder 101 through the clamping and transmission mechanism 3, effectively avoiding the deformation of the cut pipe, which is beneficial to the pipe material. Recycling, thirdly, by rotating the first servo motor 202 clockwise, the cutting mechanism 4 and the clamping and transmission mechanism 3 can be moved up and down synchronously, so that when the cutting mechanism 4 cuts the pipe, the clamping and transmission mechanism 3 can be moved to the corresponding cutting position of the pipe, ensuring the stability of the pipe during the cutting process, making the cutting edge smooth, and not prone to burrs, thereby improving the cutting quality of the pipe. Fourthly, by rotating the first servo motor 202 counterclockwise, the cutting mechanism 4 can perform circular cutting on the pipe starting from the inner wall of the pipe, more accurately controlling the force and position of the cutting knife during the cutting process, avoiding unnecessary deformation or damage to the pipe wall caused by excessive pressure, and avoiding damage or influence on the outer surface, thereby protecting the overall structure and appearance of the pipe.

[0053] Specifically, the working principle of the cutting device for improving the flatness of the cutting surface of the ventilation duct is as follows: when adjusting the cutting position and the fixed position of the ventilation duct, the driving mechanism 2 is used to rotate the transmission long tube 301 clockwise, and at this time, the reciprocating threaded cylinder 304 drives the cylindrical threaded sleeve 305 to move upward, and at the same time, the cylindrical threaded sleeve 305 drives the connecting rod 306, the lower mounting disc 307, the connecting ring 405, the cylindrical roller bearing 406, the driving ring plate 407 and the upper mounting disc 308 to move upward, and then when the cutting mechanism 4 reaches the specified cutting position, the first servo motor 202 is stopped so that it no longer rotates, and then the second electric telescopic rod 309 is started to make it The arc-shaped mounting plate 310 drives the second arc-shaped fixing plate 327 to slowly move toward the inner wall of the ventilation duct until the second arc-shaped fixing plate 327 contacts and clamps the inner wall of the ventilation duct. At the same time, during the rotation of the transmission long tube 301, the third driving wheel 303 drives the first driven wheel 324 to rotate through the first transmission belt 325. At this time, under the action of the second cylindrical gear 323, the gear ring 320 and the first tooth 321, the first cylindrical gear 318 and the first rotating rod 317 start to rotate synchronously, and the reciprocating threaded rod 313 drives the rectangular threaded sleeve 314, the fixed cover 315 and the third electric telescopic rod 316 to move upward. At the same time, the rectangular threaded sleeve 314, the fixing cover 315 and the third electric telescopic rod 316 are driven to rotate upward. The threaded sleeve 314 will move up and down at the same speed as the cylindrical threaded sleeve 305, and then by starting the third electric telescopic rod 316, the third arc-shaped fixing plate 328 can clamp the outer wall of the ventilation duct. At this time, the inner wall and the outer wall of the ventilation duct are staggered by the second arc-shaped fixing plate 327 and the third arc-shaped fixing plate 328, and at the same time, the cutting position of the cutting mechanism 4 is reserved to ensure the normal cutting work of the cutting blade 414. When the cutting blade 414 has cut the ventilation duct, the second electric telescopic rod 309 on the surface of the lower mounting disc 307 is started to return to its original position, and the third electric telescopic rod 316 near the lower end is started to return to its original position. The cut part of the ventilation duct is still clamped by the second arc-shaped fixing plate 327 and the third arc-shaped fixing plate 328 on the upper part. The second arc-shaped fixing plate 327 and the third arc-shaped fixing plate 328 of the ventilation duct body have returned to their original positions. The driving mechanism 2 is then used to rotate the transmission long tube 301 and move the cut ventilation duct upward, which makes it convenient for the staff to collect the cut pipes. At the same time, under the rotation of the reciprocating threaded cylinder 304 and the reciprocating threaded rod 313, the cylindrical threaded sleeve 305 and the rectangular threaded sleeve 314 will slowly move downward when they rise to the highest point, thereby not affecting the clamping of the next ventilation duct and the transmission of the cut material.

[0054] It should be noted that the specific models and specifications of the first electric telescopic rod 104, the first servo motor 202, the second electric telescopic rod 309, the third electric telescopic rod 316, the fourth electric telescopic rod 411 and the second servo motor 413 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be repeated in detail.

[0055] The power supply and principle of the first electric telescopic rod 104 , the first servo motor 202 , the second electric telescopic rod 309 , the third electric telescopic rod 316 , the fourth electric telescopic rod 411 and the second servo motor 413 are clear to those skilled in the art and will not be described in detail herein.

[0056] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0057] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cutting device for improving the flatness of the cutting surface of a ventilation duct, characterized in that: include: An installation mechanism (1), the installation mechanism (1) comprising a cutting cylinder (101) and a positioning seat (102), the positioning seat (102) being fixedly connected to the middle portion of the inner bottom surface of the cutting cylinder (101), and the middle portion of the lower end of the cutting cylinder (101) being fixedly connected to a positioning cylinder (103); A driving mechanism (2), the driving mechanism (2) being located at the lower end of the mounting mechanism (1), the driving mechanism (2) comprising an assembly frame (201), a first servo motor (202), a rotating ring (205), a first ratchet (206), a first connecting circular plate (208), a first pawl (209), a second ratchet (210), a second connecting circular plate (211) and a second pawl (212), the assembly frame (201) and the first servo motor (202) being fixedly connected to the lower portion of the rear end outer wall of the cutting cylinder (101), the inner wall of the assembly frame (201) being fixedly connected to a plurality of assembly plates (203), the inner walls of the assembly plates (203) being fixedly connected to assembly rings (204), the first ratchet (206) and the second ratchet (210) being respectively arranged on the inner wall of the assembly frame (201) and the second ratchet (210) being fixedly connected to the inner wall of the assembly plate (203). The first ratchet (206) is located at the upper part of the second ratchet (210); the outer wall of the first ratchet (206) is fixedly connected to the first driving wheel (213); the outer wall of the second ratchet (210) is fixedly connected to the second driving wheel (214); the first connecting circular plate (208) and the second connecting circular plate (211) are both fixedly connected to the output end of the first servo motor (202); the first connecting circular plate (208) is located in the middle of the first ratchet (206); the second connecting circular plate (211) is located in the middle of the second ratchet (210); a first pawl (209) is provided on one side of the upper part of the first connecting circular plate (208); and a second pawl (212) is provided on one side of the upper part of the second connecting circular plate (211); A clamping transmission mechanism (3), wherein the clamping transmission mechanism (3) is located inside the mounting mechanism (1), the driving mechanism (2) is located at the lower end of the clamping transmission mechanism (3), the driving mechanism (2) drives the clamping transmission mechanism (3) to move reciprocatingly up and down inside the mounting mechanism (1), the clamping transmission mechanism (3) comprises a long transmission tube (301), a third driving wheel (303), a reciprocating threaded cylinder (304), a lower mounting disc (307), an upper mounting disc (308), a mounting cover (312) and a reciprocating threaded rod (313), the long transmission tube (301) is rotatably connected to the inner wall of the positioning cylinder (103), the transmission The upper end of the long tube (301) extends to the interior of the cutting tube (101); a driving ring groove (302) is provided on the outer wall of the transmission long tube (301) near the lower end; a second transmission belt (326) is sleeved on the driving ring groove (302) and the outer wall of the first driving wheel (213); the second transmission belt (326) is arranged at the upper end of the second driving wheel (214); the third driving wheel (303) is fixedly connected to the outer wall of the lower end of the transmission long tube (301); the reciprocating threaded tube (304) is arranged on the outer wall of the upper end of the transmission long tube (301); and a cylindrical threaded sleeve (305) is sleeved on the lower end of the reciprocating threaded tube (304); The upper surface of the cylindrical threaded sleeve (305) is fixedly connected to three connecting rods (306); the lower surface of the lower mounting disc (307) is fixedly connected to the upper surface of the connecting rods (306); the upper mounting disc (308) is arranged at the upper end of the lower mounting disc (307); the upper surface of the lower mounting disc (307) and the lower surface of the upper mounting disc (308) are respectively fixedly connected to three second electric telescopic rods (309); the output ends of the second electric telescopic rods (309) are fixedly connected to an arc-shaped mounting plate (310); the upper surface of the lower mounting disc (307) and the lower surface of the upper mounting disc (308) are respectively fixedly connected to a plurality of guide seats (311); the arc-shaped mounting plate One side of each of the plurality of mounting covers (310) is fixedly connected to a second arc-shaped fixing plate (327), the three mounting covers (312) are fixedly connected to the outer wall of the upper end of the cutting cylinder (101), the reciprocating threaded rods (313) are rotatably connected to the inner top of each of the mounting covers (312), the rod bodies of each of the plurality of reciprocating threaded rods (313) are sleeved with a rectangular threaded sleeve (314), the side of each of the rectangular threaded sleeves (314) close to the cutting cylinder (101) is fixedly connected to a fixing cover (315), the end of each of the fixing covers (315) away from the middle of the cutting cylinder (101) is fixedly connected to a third electric telescopic rod (316), and the output end of each of the third electric telescopic rods (316) is fixedly connected to a third arc-shaped fixing plate (328); A cutting mechanism (4), wherein the cutting mechanism (4) is arranged inside the upper end of the mounting mechanism (1), the clamping transmission mechanism (3) drives the cutting mechanism (4) to move up and down, and the driving mechanism (2) drives the cutting mechanism (4) to rotate, thereby achieving annular cutting of the ventilation duct.

2. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: Three first electric telescopic rods (104) are fixedly connected to the outer wall of the positioning cylinder (103), and the output ends of the first electric telescopic rods (104) are fixedly connected to a first arc-shaped fixing plate (105).

3. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 2, characterized in that: The bottom surface of the positioning seat (102) is provided with three limiting grooves (106), the middle portion of the lower surface of the first arc-shaped fixing plate (105) is fixedly connected to a limiting plate (107), the limiting plates (107) slide inside the limiting grooves (106), and the middle portion of the outer wall of the cutting cylinder (101) is fixedly connected to three supporting legs (108).

4. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: The first pawl (209) cooperates with the first ratchet (206), and the second pawl (212) cooperates with the second ratchet (210).

5. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: The upper end of the assembly ring (204) is fixedly connected to a rotating ring (205), and the lower surfaces of the first ratchet (206) and the second ratchet (210) are provided with rotating grooves (207), and the rotating grooves (207) slide on the outer wall of the rotating ring (205).

6. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: The lower ends of the reciprocating threaded rods (313) pass through the mounting cover (312) and are fixedly connected to the first rotating rod (317); the lower ends of the first rotating rods (317) are fixedly connected to the first cylindrical gear (318); the outer walls of the lower ends of the cutting cylinders (101) are fixedly connected to three semi-arc guide plates (319); the upper ends of the semi-arc guide plates (319) are slidably connected to a toothed ring (320); the inner walls of the toothed rings (320) are fixedly connected to a plurality of first teeth (321); A second rotating rod (322) is provided at one side of the lower end of the cutting cylinder (101); a second cylindrical gear (323) is fixedly connected to the upper end of the second rotating rod (322); the first cylindrical gear (318) and the second cylindrical gear (323) are both meshed with the first teeth (321); a first driven wheel (324) is fixedly connected to the lower end of the second rotating rod (322); and a first transmission belt (325) is sleeved on the outer walls of the first driven wheel (324) and the third driving wheel (303).

7. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: The inner bottom of the cutting cylinder (101) is provided with three sliding rods (329), the inner walls of the cylindrical threaded sleeve (305) are respectively fixedly connected with sliding plates (330), and one side of the sliding plates (330) is slidably connected to the outer wall of the sliding rods (329).

8. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 1, characterized in that: The cutting mechanism (4) comprises a third rotating rod (401), a second driven wheel (403), a connecting ring (405) and a driving ring plate (407); the third rotating rod (401) is arranged in the middle of the transmission long tube (301); the outer walls of the upper and lower ends of the third rotating rod (401) are fixedly connected with bearing sleeves (402); the outer walls of the bearing sleeves (402) are fixedly connected with the inner wall of the transmission long tube (301); the second driven wheel (403) is fixedly connected to the outer wall of the lower end of the third rotating rod (401); the outer walls of the second driven wheel (403) and the second driving wheel (214) are sleeved with A third transmission belt (404), the upper surface of the lower mounting disc (307) and the lower surface of the upper mounting disc (308) are both fixedly connected with a connecting ring (405), the outer wall of the connecting ring (405) is fixedly connected with a cylindrical roller bearing (406), the outer wall of the cylindrical roller bearing (406) is fixedly connected to the driving ring plate (407), the inner wall of the driving ring plate (407) is fixedly connected with a plurality of second teeth (408), the outer wall of the upper end of the third rotating rod (401) is fixedly connected with a plurality of third teeth (409), and the second teeth (408) and the third teeth (409) are meshed with each other.

9. The cutting device for improving the flatness of the cutting surface of the ventilation duct according to claim 8, characterized in that: A mounting frame (410) is fixedly connected to one side of the driving ring plate (407), a fourth electric telescopic rod (411) is fixedly connected to the inner wall of the mounting frame (410), an output end of the fourth electric telescopic rod (411) is fixedly connected to a mounting frame (412), a second servo motor (413) is provided at the lower part of one side of the mounting frame (412), and a cutting blade (414) is fixedly connected to the output end of the second servo motor (413).

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