Air pipe for rotor spinning machine

Abstract

The invention belongs to the technical field of rotor spinning machines, and particularly relates to an air pipe for a rotor spinning machine, the air pipe is arranged on a rack of the rotor spinning machine and used for providing required negative pressure for each spinning station of the rotor spinning machine, the air pipe comprises a plurality of air pipe units with the same structure, and the air pipe units are connected end to end through connecting assemblies. Each air pipe unit is used for positioning an air pipe on the rack through a positioning assembly when the air pipe is mounted; each air pipe unit comprises an air pipe body, a first connecting block and a second connecting block; the connecting assembly comprises a first interface and a second interface; the positioning assembly comprises a first positioning block and a second positioning block; on the premise that the air pipe units form the full-length air pipe through the connecting assemblies, the connecting blocks are integrally arranged on the air pipe body and used for being matched with the single-spindle valve, and the air pipe is rapidly assembled on the rotor spinning machine on the basis that the positioning assemblies are used for providing the positioning effect; the problem that an existing air pipe structure affects the working efficiency when the whole rotor spinning machine is assembled is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of rotor spinning machines, and in particular relates to an air duct for rotor spinning machines. Background Art

[0002] With the rapid development of the spinning industry and the continuous improvement of automation level, various new spinning methods have emerged. Among them, the rotor spinning machine has become the most mature, widely used and most economical spinning form among the new spinning technologies due to its high spinning speed, large package capacity, good spinning adaptability and ability to spin raw materials of various qualities.

[0003] Each spinning station in the rotor spinning machine is equipped with an automatic joint device, and needs to be connected to negative pressure to achieve its automatic joint purpose. The negative pressure required by the existing rotor spinning machine is provided by the negative pressure fans located at the front and rear of the machine, and cooperate with the air duct running through the entire rotor spinning machine. The air duct is a long pipe, and the side wall of the air duct is provided with air outlets corresponding to each spinning station, and the negative pressure is connected to the automatic joint device through the single spindle valve and the corresponding connecting pipe.

[0004] Since one end of the single spindle valve connected to the air duct is a plane, and the side wall of the air duct is an arc surface, when connecting the single spindle valve to the air duct, it is necessary to weld a transition piece to connect the air duct and the single spindle valve in order to provide negative pressure for the automatic joint device, which seriously affects the convenience of the air duct preparation process; in addition, when welding a transition piece for the full-length air duct corresponding to each spinning station, the welding position of the transition piece also needs to be considered to ensure that the assembly tolerance with the single spindle valve is within the allowable range to prevent negative pressure leakage; on this basis, when assembling the air duct and the single spindle valve on the rotor spinning machine, it is also necessary to weld a flat plate on the frame of the rotor spinning machine as a reference in advance. When the single spindle valve and the flat plate are aligned with each other, the single spindle valve is connected to the equipment required for negative pressure in the automatic joint device. The above-mentioned overall operation and installation process causes great difficulties for the staff in the preparation of the air duct and the installation of the negative pressure device, which seriously affects the work efficiency. Summary of the invention

[0005] In view of this, the present invention provides an air duct for a rotor spinning machine, in which the air duct is designed in a split type, and the structure of each air duct unit is the same. Under the premise of connecting the air duct units end to end to form a full-length air duct using a connecting component, a connecting block is integrally arranged on the air duct body of each air duct unit to cooperate with a single spindle valve. Based on the positioning effect provided by the positioning component, the air duct can be quickly assembled on the rotor spinning machine, aiming to solve the problem that the existing air duct structure affects the working efficiency during the assembly of the rotor spinning machine.

[0006] A duct for a rotor spinning machine is arranged on a frame of the rotor spinning machine and is used to provide the required negative pressure for each spinning station of the rotor spinning machine. The duct includes a plurality of duct units with the same structure, and the plurality of duct units are connected end to end through a connecting assembly. Each duct unit corresponds to each spinning station one by one. On this basis, each duct unit is positioned when the duct is installed on the frame through a positioning assembly, wherein:

[0007] The air duct unit is a tubular structure of a cylinder as a whole, and the air duct unit includes an air duct body, and a first connecting block and a second connecting block are provided on the circumferential side wall of the air duct body, and the first connecting block and the second connecting block are correspondingly provided with a first air outlet and a second air outlet, and the first air outlet and the second air outlet are both connected to the air duct body, on this basis, the first connecting block and the second connecting block are respectively connected with a first single spindle valve and a second single spindle valve, and the air duct unit is connected to the spinning station through the first single spindle valve and the second single spindle valve to provide negative pressure for the spinning station;

[0008] A connecting component, comprising a first interface provided at one end of the air duct body in the air duct unit, and a second interface provided at the other end of the air duct body, wherein the circumferential outer diameter of the first interface is smaller than the circumferential inner diameter of the second interface, and the two air duct units are connected end to end by covering and fitting the second interface of any air duct unit on the circumferential outer wall of the first interface of another air duct unit, on this basis, a plurality of clamping blocks are evenly spaced on the circumferential outer wall of the first interface, and a plurality of L-shaped clamping grooves are provided on the circumferential inner wall of the second interface corresponding to the plurality of the clamping blocks, and the L-shaped clamping grooves are composed of a channel portion and a clamping portion, and when any two air duct units are docked with each other through the first interface and the second interface, the two air duct units are locked and fixed by the cooperation of the clamping blocks and the clamping portion;

[0009] A positioning assembly includes a first positioning block and a second positioning block arranged on the circumferential side wall of the air duct body, and the first positioning block is located on one side of the first interface, and the second positioning block is located on the circumferential outer wall of the second interface. In addition, a side of the first positioning block away from the air duct body is configured as a first positioning surface, and a side of the second positioning block away from the air duct body is configured as a second positioning surface. The first positioning surface and the second positioning surface are both planes and are in the same plane. When the first positioning surface and the second positioning surface are simultaneously in contact with the frame, the positioning assembly plays its positioning role. At this time, the first single spindle valve and the second single spindle valve are aligned with the subsequent negative pressure transmission equipment in the spinning station, and have a structural basis that is interconnected with them.

[0010] Preferably, the entire material of the air duct is PVC.

[0011] Furthermore, in each of the air duct units, two threaded holes are provided on the first connecting block and the second connecting block, and screws are provided on the first single ingot valve and the second single ingot valve corresponding to each threaded hole respectively, and the first single ingot valve and the second single ingot valve are respectively connected to the first connecting block and the second connecting block through the threaded cooperation between the screws and the threaded holes.

[0012] Furthermore, in each of the air duct units, a weight-reducing groove is provided on the first connecting block and the second connecting block, and the weight-reducing groove does not interfere with the threaded hole.

[0013] Preferably, in the positioning assembly, the first positioning block and the second positioning block are also provided with a plurality of weight-reducing grooves.

[0014] Furthermore, the positioning assembly also includes: a first card slot opened on the side wall of the first positioning block away from the first connecting block, and a second card slot opened on the side wall of the second positioning block away from the first connecting block, the first card slot corresponds to the second card slot, and the first card slot and the second card slot are jointly buckled and connected with a U-shaped buckle, when any two air duct units are connected through the connecting assembly, and the buckle is buckled and connected with the first card slot and the second card slot, the end face of the buckle is in the same plane with the first positioning surface and the second positioning surface.

[0015] The beneficial effects of the present invention are:

[0016] In general, the present invention arranges the existing full-length air duct into a segmented type, provides a number of air duct units with the same structure, and each air duct unit corresponds to a spinning station; the air duct units are connected end to end by means of connecting components arranged on the air duct units to form an air duct that provides negative pressure for the entire rotor spinning machine; in addition, a first connecting block and a second connecting block are arranged on the air duct body of each air duct unit, so as to match and connect the air duct with the first single spindle valve and the second single spindle valve before the rotor spinning machine is assembled as a whole, and the assembly tolerance is limited by the positioning component arranged on the air duct body. When the positioning component plays a positioning role, it indicates that the matching connection between the first single spindle valve, the second single spindle valve and the first connecting block and the second connecting block is within the range allowed by the tolerance. At this time, the air duct as a whole can be conveniently installed on the frame of the rotor spinning machine through the positioning component, thereby saving the measurement time of the staff during the assembly of the rotor spinning machine and improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the air duct in the present invention;

[0019] Figure 2 It is a schematic diagram of the specific structure of the air duct unit in the present invention;

[0020] Figure 3 It is a schematic diagram of the specific structure of the connecting component and the positioning component in the present invention;

[0021] Figure 4 It is a schematic diagram of the specific structure of the buckle in the positioning component;

[0022] Figure 5 It is a schematic diagram of the connection structure between the air pipe body and the first single ingot valve and the second single ingot valve in the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The solution provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0026] An air duct for a rotor spinning machine provided by the present invention is arranged on the frame of the rotor spinning machine, and is used to provide the required negative pressure for each spinning station of the rotor spinning machine. It should be noted that: in the prior art, each spinning station is provided with an automatic joint device, and the swing arm suction nozzle and the yarn storage device in the automatic joint device both require negative pressure to realize their functions, and the negative pressure used by the rotor spinning machine is provided by the negative pressure device. According to the prior art, the negative pressure device mainly includes an air duct 1, and the air duct 1 runs through each spinning station of the entire rotor spinning machine, so the air duct 1 is required to provide negative pressure for each spinning station as a whole.

[0027] like Figure 1-2 As shown, the air duct 1 includes a plurality of air duct units 3 with the same structure, and the plurality of air duct units 3 are connected end to end through a connecting component 4, and each air duct unit 3 corresponds one-to-one to each spinning station. On this basis, each air duct unit 3 realizes the positioning of the air duct 1 when it is installed on the frame through a positioning component 5.

[0028] In the present application, the original full-length air duct 1 structure is abandoned, and a number of air duct units 3 are designed to correspond to each spinning station one by one, and the overall material of the air duct 1 is PVC, so that when the same mold is designed, the air duct units 3 can be mass-produced to meet the needs of rotor spinning machines with different numbers of spindles. There is no need to produce air ducts 1 of different lengths according to the number of spinning stations of the rotor spinning machine, which increases the convenience of production and assembly.

[0029] Next, the specific structure and function of the air duct unit 3 will be described in detail. Figure 2 As shown, the air duct unit 3 is a cylindrical tubular structure as a whole, and the air duct unit 3 includes an air duct body 301, and a first connecting block 302 and a second connecting block 303 are provided on the circumferential side wall of the air duct body 301, and a first air outlet 304 and a second air outlet 305 are correspondingly provided on the first connecting block 302 and the second connecting block 303, and the first air outlet 304 and the second air outlet 305 are both connected to the air duct body 301.

[0030] In this embodiment, if Figure 5 As shown, the first connecting block 302 and the second connecting block 303 are respectively connected to the first single spindle valve 6 and the second single spindle valve 7. The air duct unit 3 is connected to the spinning station through the first single spindle valve 6 and the second single spindle valve 7. When the rotor spinning machine provides negative pressure to the spinning station through the negative pressure device, the opening and closing degree of the first single spindle valve 6 and the second single spindle valve 7 is used to control the size of the negative pressure connected to the spinning station. Among them, the first single spindle valve 6 and the second single spindle valve 7 are commonly used components of the rotor spinning machine in the prior art. This application only introduces their usage and does not elaborate on their structure.

[0031] Based on the above embodiments, Figure 2 , Figure 5As shown, the first connecting block 302 and the second connecting block 303 are each provided with two threaded holes 306, and the first single ingot valve 6 and the second single ingot valve 7 are respectively provided with screws corresponding to each threaded hole 306, and the first single ingot valve 6 and the second single ingot valve 7 are respectively connected to the first connecting block 302 and the second connecting block 303 through the threaded cooperation between the screws and the threaded holes 306; in addition, the first connecting block 302 and the second connecting block 303 are each provided with a weight reducing groove 8, and the weight reducing groove 8 and the threaded hole 306 do not interfere with each other.

[0032] Therefore, the first connecting block 302 and the second connecting block 303 provided in conjunction with the first single spindle valve 6 and the second single spindle valve 7 make it more convenient to install the single spindle valve on the air duct 1, and the need to additionally set up transition pieces for the coordination between the air duct 1 and each single spindle valve in the existing rotor spinning machine is eliminated, thereby improving the work efficiency of the staff in the coordination and installation of each single spindle valve and the air duct 1; and the setting of the weight reduction groove 8 saves the preparation of raw materials on the basis of meeting the structural requirements.

[0033] For the interconnection of several air duct units 3, the present application provides a corresponding connection component 4 on each air duct unit 3, such as Figure 2-3 As shown, the connecting component 4 includes a first interface 401 arranged at one end of the air duct body 301 in the air duct unit 3, and a second interface 402 arranged at the other end of the air duct body 301, wherein the circumferential outer diameter of the first interface 401 is smaller than the circumferential inner diameter of the second interface 402.

[0034] Based on the above embodiment, the two air duct units 3 are connected end to end by covering the second interface 402 of any air duct unit 3 and fitting it on the circumferential outer wall of the first interface 401 of another air duct unit 3. In addition, a sealing ring is also provided on the circumferential outer wall of the first interface 401, so that when the first interface 401 and the second interface 402 cooperate with each other, several air duct units 3 are sealed at the interconnected interfaces to avoid negative pressure leakage.

[0035] On this basis, if Figure 3As shown, a plurality of snap-in blocks 403 are evenly spaced on the circumferential outer wall of the first interface 401, and a plurality of L-shaped snap-in grooves are provided on the circumferential inner wall of the second interface 402 corresponding to the plurality of snap-in blocks 403, wherein the L-shaped snap-in groove is composed of a channel portion 404 and a snap-in portion 405. When any two air duct units 3 are docked with the second interface 402 through the first interface 401, the two air duct units 3 are locked and fixed by the cooperation between the snap-in blocks 403 and the snap-in portions 405. Specifically, when the two air duct units 3 are docked with the second interface 402 through the first interface 401, the plurality of snap-in blocks 403 simultaneously slide in the plurality of channel portions 404 corresponding to each other until the snap-in blocks 403 slide to the bottom of the channel portion 404, and then one of the air duct units 3 is rotated so that the plurality of snap-in blocks 403 are simultaneously rotated and inserted into the corresponding plurality of snap-in portions 405, thereby completing the locking and fixing between the two air duct units 3.

[0036] Based on the above embodiment, the staff can determine the number of air duct units 3 used according to the actual spindle number model of the rotor spinning machine, and use the connecting component 4 to connect the required air duct units 3 end to end to form the air duct 1, making the setting and installation of the air duct 1 easier.

[0037] In the present technical solution, in addition to making convenient improvements to the structure of the air duct 1 required for the entire rotor spinning machine, the present application also makes specific structural improvements to the operating method for connecting the air duct 1 with each spinning station, that is, a positioning component 5 is set on the air duct body 301.

[0038] like Figure 2-3 As shown, the positioning assembly 5 includes a first positioning block 501 and a second positioning block 502 arranged on the circumferential side wall of the air duct body 301, and the first positioning block 501 is located on one side of the first interface 401, and the second positioning block 502 is located on the circumferential outer wall of the second interface 402. In addition, the side of the first positioning block 501 away from the air duct body 301 is configured as a first positioning surface 503, and the side of the second positioning block 502 away from the air duct body 301 is configured as a second positioning surface 504, and the first positioning surface 503 and the second positioning surface 504 are both planes and are in the same plane.

[0039] Based on the above embodiment, when the first positioning surface 503 and the second positioning surface 504 are simultaneously in contact with the frame, the positioning assembly 5 plays its positioning role. At this time, the first single spindle valve 6 and the second single spindle valve 7 are aligned with the subsequent negative pressure transmission equipment in the spinning station, and have a structural basis for interconnection therewith. The subsequent negative pressure transmission equipment here refers to a connecting pipe that plays a role in transmitting negative pressure, and the connecting pipe is connected to the required negative pressure equipment in the automatic joint device, such as a swing arm suction nozzle, a yarn storage device, etc.; specifically, when the air duct 1 is assembled according to the above content and the first single spindle valve 6 and the second single spindle valve 7 are installed in each air duct unit 3, the air duct 1 needs to be assembled on the rotating On the frame of the cup spinning machine, the staff then places the air duct 1 as a whole on the frame, rotates the air duct 1, and makes the first positioning surface 503 and the second positioning surface 504 in the positioning assembly 5 in each air duct unit 3 fit with the frame of the frame at the same time. At this time, the staff can install the first single ingot valve 6 and the second single ingot valve 7 in coordination with the subsequent negative pressure transmission equipment in the spinning station, and the assembly tolerance of the first single ingot valve 6 and the second single ingot valve 7 with it meets the requirements. This process abandons the original assembly process that requires the staff to correspond to each single ingot valve and the transition piece, and each single ingot valve and the flat plate preset on the frame in turn, making the installation process more convenient and improving production efficiency.

[0040] In addition, in the positioning component 5, as Figure 3-4 As shown, a plurality of weight-reducing grooves 8 are also provided on the first positioning block 501 and the second positioning block 502. On the basis of the weight-reducing grooves 8, the positioning assembly 5 also includes a first card slot 505 opened on the side wall of the first positioning block 501 away from the first connecting block 302, and a second card slot 506 opened on the side wall of the second positioning block 502 away from the first connecting block 302. The first card slot 505 corresponds to the second card slot 506, and the first card slot 505 and the second card slot 506 are jointly buckled and connected with a U-shaped buckle 2.

[0041] Based on the above embodiment, when any two air duct units 3 are connected through the connecting component 4, and the buckle 2 is engaged with the first slot 505 and the second slot 506, the end face of the buckle 2 and the first positioning surface 503 and the second positioning surface 504 are in the same plane. The cooperation between the buckle 2 and the first slot 505 and the second slot 506, on the one hand, strengthens the connection effect of the connecting component 4 to avoid relative rotation of the two air duct units 3, and on the other hand, it is convenient for the staff to move the connected and assembled air duct 1 as a whole.

[0042] Specifically, the present invention provides an air duct for a rotor spinning machine, which arranges the existing full-length air duct into a segmented type, so that each air duct unit 3 corresponds to a spinning station, and the overall material of the air duct 1 is PVC, so that when the same mold is designed, the air duct units 3 can be mass-produced to meet the needs of rotor spinning machines with different numbers of spindles, and there is no need to produce air ducts 1 of different lengths according to the number of spinning stations of the rotor spinning machine; in addition, the present application also arranges a first connecting block 302 and a second connecting block 302 integrally connected to the air duct body 301 on the air duct body 301 of the air duct unit 3, which are respectively used to assemble the first single spindle valve 6 and the second single spindle valve 6. The spindle valve 7 abandons the operation of additionally setting up transition pieces for the coordination between the air duct 2 and each single spindle valve in the existing rotor spinning machine, thereby improving the work efficiency of the staff in the coordination installation of each single spindle valve and the air duct 2; on this basis, the present application utilizes the connecting component 4 provided on the air duct unit 3 to connect them end to end, and under the positioning action of the positioning component 5, the staff can conveniently coordinate the first single spindle valve 6 and the second single spindle valve 7 with the subsequent negative pressure transmission equipment in the spinning station for installation, abandoning the original assembly process that requires the staff to correspond to each single spindle valve and the transition piece, and each single spindle valve and the flat plate preset on the frame in turn, making the installation process more convenient and improving production efficiency.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air duct for a rotor spinning machine, which is arranged on a frame of the rotor spinning machine and is used to provide the required negative pressure for each spinning station of the rotor spinning machine, and is characterized in that: The air duct includes a plurality of air duct units with the same structure, and the plurality of air duct units are connected end to end through a connecting assembly, and each air duct unit corresponds to each spinning station one by one. On this basis, each of the air duct units realizes the positioning of the air duct when it is installed on the frame through a positioning assembly, wherein: The air duct unit is a tubular structure of a cylinder as a whole, and the air duct unit includes an air duct body, and a first connecting block and a second connecting block are provided on the circumferential side wall of the air duct body, and the first connecting block and the second connecting block are correspondingly provided with a first air outlet and a second air outlet, and the first air outlet and the second air outlet are both connected to the air duct body, on this basis, the first connecting block and the second connecting block are respectively connected with a first single spindle valve and a second single spindle valve, and the air duct unit is connected to the spinning station through the first single spindle valve and the second single spindle valve to provide negative pressure for the spinning station; A connecting component, comprising a first interface provided at one end of the air duct body in the air duct unit, and a second interface provided at the other end of the air duct body, wherein the circumferential outer diameter of the first interface is smaller than the circumferential inner diameter of the second interface, and the two air duct units are connected end to end by covering and fitting the second interface of any air duct unit on the circumferential outer wall of the first interface of another air duct unit, on this basis, a plurality of clamping blocks are evenly spaced on the circumferential outer wall of the first interface, and a plurality of L-shaped clamping grooves are provided on the circumferential inner wall of the second interface corresponding to the plurality of the clamping blocks, and the L-shaped clamping grooves are composed of a channel portion and a clamping portion, and when any two air duct units are docked with each other through the first interface and the second interface, the two air duct units are locked and fixed by the cooperation of the clamping blocks and the clamping portion; A positioning assembly includes a first positioning block and a second positioning block arranged on the circumferential side wall of the air duct body, and the first positioning block is located on one side of the first interface, and the second positioning block is located on the circumferential outer wall of the second interface. In addition, a side of the first positioning block away from the air duct body is configured as a first positioning surface, and a side of the second positioning block away from the air duct body is configured as a second positioning surface. The first positioning surface and the second positioning surface are both planes and are in the same plane. When the first positioning surface and the second positioning surface are simultaneously in contact with the frame, the positioning assembly plays its positioning role. At this time, the first single spindle valve and the second single spindle valve are aligned with the subsequent negative pressure transmission equipment in the spinning station, and have a structural basis that is interconnected with them.

2. The air duct for a rotor spinning machine according to claim 1, characterized in that: The whole material of the air duct is PVC.

3. The air duct for a rotor spinning machine according to claim 1, characterized in that: In each of the air duct units, two threaded holes are provided on the first connecting block and the second connecting block, and screws are provided on the first single ingot valve and the second single ingot valve corresponding to each threaded hole respectively. Through the threaded cooperation between the screws and the threaded holes, the first single ingot valve and the second single ingot valve are respectively connected to the first connecting block and the second connecting block.

4. The air duct for a rotor spinning machine according to claim 3, characterized in that: In each of the air duct units, a weight-reducing groove is provided on the first connecting block and the second connecting block, and the weight-reducing groove and the threaded hole do not interfere with each other.

5. The air duct for a rotor spinning machine according to claim 1, characterized in that: In each of the air duct units, a sealing ring is sleeved on the circumferential outer wall of the first interface.

6. The air duct for a rotor spinning machine according to claim 1, characterized in that: In the positioning assembly, the first positioning block and the second positioning block are also provided with a plurality of weight-reducing grooves.

7. The air duct for a rotor spinning machine according to claim 6, characterized in that: The positioning assembly also includes: a first slot formed on a side wall of the first positioning block away from the first connecting block, and a second slot formed on a side wall of the second positioning block away from the first connecting block, the first slot corresponds to the second slot, and the first slot and the second slot are jointly buckled and connected with a U-shaped buckle, when any two air duct units are connected through the connecting assembly, and the buckle is buckled and connected with the first slot and the second slot, the end face of the buckle is in the same plane as the first positioning surface and the second positioning surface.

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