205results about "Piercing arrangements" patented technology

A spinning station of a spinning machine for producing a thread from a sliver. A thread end is taken up by a take-up device and transferred to a preparation device downstream from a vortex chamber of the spinning device, the thread end is subsequently treated in the preparation device and then transferred to the vortex chamber, a drafting system for supplying a sliver to the vortex chamber is powered up, wherein an exit roller pair of the drafting system is accelerated to a predetermined draw-off speed, and the sliver is spun onto the thread end in the vortex chamber and a draw-off device for drawing off the thread spun in the vortex chamber is powered up and accelerated up to the draw-off speed. The speed of the exit roller pair and / or of the draw-off device increases non-linearly and / or approaches the predetermined draw-off speed non-linearly around the end of powering up.

The invention discloses a ring spinning spun yarn automatic joint self-navigation composite robot and an interactive control method of a cooperative system thereof. Starting from the interactive control method of the ring spinning spun yarn automatic joint robot and the cooperative system thereof and the actual operation condition of each device of a spinning frame, the problem that an air blowing and suction device and a falling device of the spinning frame conflict with AGV operation is solved by utilizing an AGV-driven signal interaction mode. Interaction control of the AGV, the spinning frame air blowing and suction device and the falling device is achieved in a database sharing mode. According to the method, the difference of air blowing and suction motion states of different spinning frames is considered, AGV coping strategies in different motion states are introduced, and therefore the operation safety of the AGV in the roadway of the spinning frames is enhanced.

The invention relates to a full-automatic sliver jointing device and method. The joint device comprises a servo walking mechanism, a robot body, a visual system, a flexible grabbing mechanism and a high-precision joint mechanism. The servo walking mechanism is installed on the machine frame, the robot body is fixedly installed on the servo walking mechanism and moves along with the servo walking mechanism, and the visual system, the flexible grabbing mechanism and the high-precision joint mechanism are installed on the robot body. According to the full-automatic cotton sliver jointing device, unmanned operation of the whole process from broken end detection, positioning, grabbing to jointing is achieved, and the labor cost and the labor intensity are greatly reduced.

The invention relates to the technical field of production of compact spinning yarns, in particular to an automatic joint mechanism for compact spinning yarns, which comprises a base, a connecting chamber is arranged above the base, and traction heads are arranged at two ends of the connecting chamber; the clamping assembly is arranged in the traction head, and a cutting assembly is arranged on one side of the clamping assembly; the wiring assembly is rotationally arranged in the wiring chamber; the yarn cutting device has the beneficial effects that when yarn is broken, conveying is stopped, a fourth motor is started at the moment, the fourth motor drives a second adjusting ring to rotate through a second transmission gear, then multiple sets of clamping blocks get close to one another to clamp the yarn, meanwhile, a cutting knife is driven to cut off the yarn, and after cutting is completed, a first motor is started; through cooperation of a double-end lead screw and a sliding block, the yarn is driven to be inserted into the interior of the yarn connecting chamber, then a cutting knife is reset, then through cooperation of a first automatic telescopic rod and a clamping assembly, the ends of the yarn are conveyed to the position between heating plates, the yarn is heated, and the ends of the yarn are fused.

The utility model relates to a device for finding out a broken yarn joint of a ring bobbin, and the device comprises an air blowing device which is used for providing a positive pressure air source; the mounting plate is positioned on one side of the blowing device; the fixing device comprises a fixing pipe, a first driving assembly and a second driving assembly, the fixing pipe is used for fixing the ring bobbin, the first driving assembly is used for driving the fixing pipe to drive the ring bobbin to rotate, and the second driving assembly is used for driving the fixing pipe to drive the ring bobbin to linearly move, so that the ring bobbin is in a moving state of moving up and down while rotating; the static electricity removing device is used for removing static electricity of yarns on the ring bobbin; the air suction traction device is used for generating negative pressure, the air suction traction device and the air blowing device are arranged on the two sides of the fixing device correspondingly, and the air suction traction device and the air blowing device form directional airflow so that the broken yarn on the ring bobbin in the moving state can be separated from the ring bobbin. The structure is high in automation degree, broken yarn does not need to be manually found, the production efficiency is improved, the labor cost is reduced, and the yarn quality is guaranteed.

The utility model provides a yarn untwisting device which comprises an untwisting pipe, a fixed seat and a base which are sequentially connected, an air inlet hole and an air outlet hole are arranged on the base, and the yarn untwisting device is characterized in that the fixed seat is arranged in a fixed seat shell, the fixed seat shell and the fixed seat shell are tightly connected to form a semicircular or annular air channel, and the semicircular or annular air channel is provided with an air channel through hole I and an air channel through hole II. An inclined through hole is formed in the side wall of one end of the untwisting pipe, the untwisting pipe is connected with the fixing base in a rotating and adjustable mode, and the inclined through hole is communicated with the air path through hole I or the air path through hole II and used for untwisting Z-twist or S-twist yarn. The fixing seat is connected with the base, and the air outlet hole in the base is communicated with the semicircular or annular air channel. Bending points in an air channel of untwisting air flow can be reduced, the air flow in the air channel can run smoothly, the stability of yarn processing and the untwisting effect are guaranteed, the variety adaptability is high, Z-twist yarn and S-twist yarn can share the same device, assembly is easy, and operation and use are convenient.

The invention discloses a high-speed ring spinning yarn blending method and a spinning frame, and belongs to the technical field of spinning yarn blending, and the method comprises the steps of S1 raw material preparation and pretreatment, S2 cotton carding, S3 drawing, S4 roving, S5 spinning, S6 spooling and S7 jointing. The spinning frame comprises a spinning frame body and an inspection robot. Through intelligent twisting control, dynamic adjustment of rotating speed and twist, balance of strength and elongation of different fibers and reduction of layering phenomena, the yarn evenness CV value is reduced by 10%-15%, the tension sensor adjusts roller pressure, arrangement uniformity of blended fibers is remarkably improved, broken ends are detected through the industrial camera to achieve millisecond-level response, the broken end detection accuracy is larger than or equal to 99%, and the production efficiency is greatly improved. Raw material waste is reduced by 30%-40%, the strength of the joint through the inspection robot and the full-automatic joint manipulator reaches more than 90% of that of the grey yarn, and the weak joint problem caused by manual intervention is reduced.

A splicing method of a splicing device on a ring spinning machine with a plurality of spinning stations, from which rovings are brought out from delivery rolls and are converted into yarn and are wound on a tube, in the event of a yarn break, the splicing device produces a splice in which a yarn end is connected to a roving coming out from a delivery roll and the spinning process is continued. Alternatively according to procedure a), a yarn end of the broken yarn is searched for, the found yarn end is detected and is used for splicing to obtain a tube without yarn interruption, or according to procedure b), an auxiliary yarn from a yarn supply is fastened to the tube, then the auxiliary yarn is separated to obtain a yarn end fastened to the tube, and the yarn end is used for splicing to obtain a tube with yarn interruption. Depending on the degree of utilization of the capacity of the splicing device and / or the possible prospect of success of procedure a), it is selected whether a yarn end is provided according to procedure a) or b), assuming that procedure a) takes more time than procedure b.

To provide a yarn winder capable of avoiding accumulation of scrap in a suction duct while reducing energy consumption.SOLUTION: A yarn winder 1 is provided with a winding unit 2 having a first suction device 11, a carriage 3 having second suction devices 27, 28, a first suction duct 41 to which the first suction device 11 is connected, a second suction duct 42 to which the second suction devices 27, 28 are connected, a blower 45 for generating a suction air flow in the first suction duct 41 and the second suction duct 42, a first shutter 51 for opening and closing a first opening 51A of the first suction duct 41, a second shutter 52 for opening and closing a second opening 52A of the second suction duct 42, and a control unit 15 for controlling the opening and closing of the first shutter 51 and the second shutter 52 so that at least one of the start timings of the first opening operation and the second opening operation and the end timings of the first opening operation and the second opening operation deviate from each other.SELECTED DRAWING: Figure 2

The invention provides a spinning machine. The spinning machine includes a spinning device, a yarn storage device, a winding device, a yarn joining device, a suction tube, a second catching device (24), and a moving portion (67). When the yarn (15) is broken, the suction tube captures the yarn (15) on the side of the spinning device and guides the yarn (15) on the side of the spinning device towards the yarn joining device. The second catching device (24) is disposed so as to face the yarn path, and catches the yarn (15) on the opposite package side when the yarn (15) is broken. The acting portion is disposed between the second catching device (24) and the yarn joining device on the yarn path, and separates the yarn (15) on the spinning device side and the yarn (15) on the package side when the yarn (15) is broken. The yarn joining device starts yarn joining while the action unit separates the yarn (15) on the spinning device side and the yarn (15) on the package side.

The invention relates to an automatic splicing device and process for non-twisting filament fibers, a cavity is arranged on a workbench, a splicing part is arranged in the cavity, and the splicing part comprises a tensioning assembly and a processing assembly which are matched with each other; the device further comprises a first erecting assembly and a second erecting assembly, and the first erecting assembly and the second erecting assembly are located on the portions, on the two sides of the cavity, of the surface of the workbench correspondingly. According to the automatic filament fiber splicing device and process, through innovative structural design and automatic control, the synergistic effect of the tensioning assembly and the processing assembly is adopted, staged tensioning driven by the lifting air cylinder is combined, transposition control over the frame body in the first erecting assembly can be achieved, and the splicing efficiency is improved. Accurate control and continuous production of the filament fiber tension force are achieved, the yarn changing shutdown time is shortened from several hours to the second level, and the production efficiency is improved.

A method for producing a yarn having a pattern characterized by a plurality segments that are assembled into a sequence of rows, i.e. clusters. The yarn is preferably knotless. The method splices segments having a different length so that the pattern can be easily arranged with visibly distinct colours.

The invention provides a silk yarn breakage temporary clamping assembly of a chemical fiber two-for-one twister, and relates to the field of chemical fiber equipment, the silk yarn breakage temporary clamping assembly comprises a base, a plurality of two-for-one twisting modules are arranged on the base from bottom to top at equal intervals, each two-for-one twisting module is composed of a base, two rings, two clamping assemblies, two tensioning assemblies, two sleeves and a rotating block, the tensioning assemblies are arranged on the left side of the base, and the clamping assemblies are arranged on the right side of the base. The ring is arranged on the right side of the base. According to the temporary clamping assembly for yarn breakage of the chemical fiber two-for-one twister, the base, the ring and the sleeve are arranged, the multiple clamping assemblies are arranged between the ring and the base in a sliding fit mode, each clamping assembly comprises a driving base, a clamping piece and an electromagnet unit, the electromagnet units are powered on to generate a magnetic field, the two clamping pieces are made to be close to and attached to each other, and the purpose of clamping yarn is achieved. The whole clamping assembly is driven by the motor to rotate, so that the purpose of winding the broken thread ends is achieved, the purpose of collecting the broken thread ends is achieved, and the broken thread is prevented from falling down to be entangled with other thread ends.

The invention relates to a textile machine that can have at least one first vacuum point for producing a thread. The textile machine can have at least one second vacuum point for drawing in the thread. The textile machine can have at least one first vacuum system. This can be designed and arranged to be fluidically connected to the first vacuum point. Alternatively, the first vacuum system can be designed and arranged to be in fluidic connection with the first vacuum point. The textile machine can have at least one second vacuum system. This can be designed and arranged to be fluidically connected to the second vacuum point. Alternatively, the second vacuum system can be designed and arranged to be in fluidic connection with the second vacuum point.In order to make the design of a textile machine more flexible, to further improve the vacuum allocation and to make the vacuum allocation more flexible, it is provided that a connection between the first vacuum system and the second vacuum system is designed in such a way that the connection can be selectively established or interrupted.

The present invention relates to an attending device for a ring spinning machine for producing yarn which comprises a supporting structure in which are arranged means (11) for mounting the attending device (1) on the machine displaceable along at least one row of workstations (2) and for moving it along the row of workstations (2) of the machine, service means (SM) for performing service operations at the workstations (2) of the machine and a power supply system and a control system (CS). At least one non-contact sensor (12) of the profile of the surface of the rotating element is mounted in the supporting structure, wherein the non-contact sensor (12) has a sensing area (SA) which is directed outside the ground plan of the attending device (1) and the non-contact sensor (12) is adapted to transmit the data about the sensed profile or is coupled to means for transmitting the data about the sensed profile or can be coupled to means for transmitting the data about the sensed profile.

A joining head (10) adapted for use in a device (100) for joining textile threads and yarns by means of a pressurized fluid, the joining head comprising: a body (11) in which a longitudinally extending splice chamber (12) is formed, the splice chamber (12) being open at opposite ends (12a, 12b) and provided with a longitudinal slot (13) at the top; at least one nozzle (15a, 15b) for introducing a pressurized fluid into the splicing chamber (12); at least one fluid outlet opening (18) formed in the body (11) and extending transversely to a longitudinal median plane (PL) of the joining chamber (12); at least one fluid outlet opening (18) which extends transversely to the longitudinal median plane (PL) of the splicing chamber (12), the outlet opening (18) being asymmetrical with respect to the longitudinal median plane (PL) and freely leading to the outside of the splicing chamber (12) at a single wall thereof, and at least one fluid outlet opening (18) which extends transversely to the longitudinal median plane (PL) of the splicing chamber (12). The pressurized fluid extraction opening (18) comprises a through opening formed in only one of the two walls (19, 20) laterally delimiting the splicing chamber (12), and the through opening has opposite ends respectively free to open into the interior and the exterior of the splicing chamber (12).

The invention discloses a ring spinning spun yarn jointing device and method, the ring spinning spun yarn jointing device comprises a transverse moving assembly and a clamping transmission part, the outer side of the transverse moving assembly is provided with a yarn hooking transmission mechanism assembled by bolts, and the inner side of one end of the yarn hooking transmission mechanism is provided with an extraction transmission part connected with the output end. According to the device, a transverse moving assembly is mainly used for being matched with output operation of an upper lifting adjusting component; after hydraulic oil cylinders distributed in a single group are output and run, a lifting rod, an electric rotating seat, a rear arm, a middle free arm, a swinging rod and a hinging base are subjected to hinge degree-of-freedom transmission, and then a front block, an elastic rod at one end of a rotating base and a yarn hook are used for hooking yarns; and after hooking, the upper clamping transmission component and the sand output assembly are matched to achieve the effect of extracting, carrying and conveying, so that the effect of automatic conveying in the whole process is achieved, the burden of workers can be effectively reduced, and the joint connecting efficiency of equipment is improved.

The invention relates to an automatic wiring unit (2) for a ring spinning machine (1) having an annular track (3), comprising a housing (6), a tower device (4), a control unit (2b) for a wiring assistance module, in which an encoder (8) is arranged in the housing (6) that can be moved on the tower device (4), and a measuring device (9) is mounted on the tower device (4), the method is used for determining the position of an annular track (3) of the ring spinning machine (1).

A yarn splicer device (4) comprising a pair of opposite plates (8,12) which are rotatable with respect to a common drive axis (X-X), the plates (8,12) being spaced apart from each other, along said drive axis (X-X), so as to identify a passage path (14) of a first yarn (16) ending with a first thread (20) and a second yarn (24) ending with a second thread (28), to be mutually spliced, tail tearing means (32), configured to grasp and tear tails (36) of said first and second thread (20,28), so as to obtain tearing points (40) positioned at least partially inside said passage path (14) of the first and second yarn (16,24), wherein said tail tearing means (32) comprise a first pair of counter-rotating rotatable cylinders (44), configured to clamp the tail (36) of said first thread (20) and / or a second pair of counter-rotating rotatable cylinders (48), configured to clamp the tail (36) of said second thread (28).

The invention relates to the technical field of two-for-one twister production, in particular to a two-for-one twister broken yarn detection device and an automatic yarn connection mechanism, the two-for-one twister broken yarn detection device comprises a two-for-one twister rack and a yarn guide mechanism, and the two-for-one twister rack is provided with a pay-off cylinder and a twisting cylinder. Through the arrangement of the yarn guide mechanism, the guide wheel and the tensioning piece can keep tensioning acting force on the yarn when the two-for-one twister is in a normal state, and through the cooperation of the arrangement of the extrusion piece, once the yarn is broken, the yarn breaking condition can be rapidly detected through the tensioning change of the elastic abutting piece; a horizontal shuttle guiding mechanism and a yarn guiding mechanism are combined, a broken yarn clamping assembly is rapidly started, broken yarn is rapidly clamped, and through cooperation of an air injection assembly, surface dust removal of the yarn in the normal state can be achieved, broken yarn sections can be continuously blown, the situation that the yarn ends are curled in a conical barrel is avoided, and the yarn quality is improved. The wire end can be conveniently exposed, and the automatic wiring efficiency is improved.

The invention provides a yarn hook yarn picking device of a ring spinning machine. The yarn hook yarn picking device is used for solving the problems that in the prior art, the structure is complex, a broken yarn end is difficult to find quickly, and an end-broken yarn is difficult to penetrate through a steel wire ring successfully. Comprising a base, a broken yarn end finding assembly, an ingot pulling and yarn combing assembly and a yarn picking module, and the broken yarn end finding assembly comprises an end finding module, a rotating module and a moving module; the yarn picking module comprises a yarn hook parallel to the central axis of the yarn suction pipe and a yarn picking power module for driving the yarn hook to rotate, the rear end of the yarn hook penetrates through and is rotationally arranged on the clamping block, the front end of the yarn hook is provided with a first bent shape, and the front end of the yarn suction pipe is provided with a second bent shape which forms a U-shaped structure with the first bent shape of the front end of the yarn hook; a yarn picking and threading part is formed between the first bent shape of the yarn hook and the second bent shape of the yarn suction pipe, and the yarn picking and threading part is matched with the rotating module and the moving module to be quickly and conveniently connected to a roller in a penetrating mode. The device is compact in structure, can adapt to rapid yarn combing and end finding of bobbins of different specifications, and can also improve the threading success rate.

To reduce the burden on users in setting up textile machinery. [Solution] The textile machinery system 100 comprises a first textile machine 1, a second textile machine 2, and a control device 3. The first textile machine 1 and the second textile machine 2 have winding devices that wind yarn to form packages. The control device 3 is capable of communicating with the first textile machine 1 and the second textile machine 2. The control device 3 includes a first input providing unit F11, a first calculation unit F12, a first output unit F13, a second input providing unit F21, a second calculation unit F22, and a second output unit F23. The input receiving unit receives input of yarn-related information. The calculation unit calculates setting information for yarn splicing and / or yarn generation in the first textile machine 1 and the second textile machine 2, corresponding to the input yarn-related information, based on the input yarn-related information. The output unit outputs the setting information.

The present invention discloses a broken yarn separation and capture device and method for a ring spinning frame, relating to the technical field of automatic jointing of ring spinning frames; the device includes a yarn suction end effector and a driving base, and the yarn suction end effector is installed on the driving base; the yarn suction end effector includes a yarn suction nozzle, a yarn clamping component, a broken yarn monitoring component, a self-cleaning component, a yarn suction pipe and a proximity switch; the yarn suction nozzle is connected to one end of the yarn suction pipe close to the broken yarn bobbin, and the other end of the yarn suction pipe is connected to a negative pressure source; the yarn clamping components are symmetrically connected to the pipe wall of the yarn suction pipe and are located behind the yarn suction nozzle for clamping or releasing the captured broken yarn; the broken yarn monitoring component is connected to the pipe wall of the yarn suction pipe and is located behind the yarn clamping component; the self-cleaning component is connected to the pipe wall of the yarn suction pipe. The present invention realizes the separation and capture of broken yarns at the original broken yarn spindle position after the broken yarn in the ring spinning frame, reduces the complexity of the structure of the automatic jointing device, and improves the stability of broken yarn separation and capture.

The invention belongs to the technical field of spinning, and particularly relates to a conveying mechanism for a loom and a conveying process. The conveying mechanism for the loom comprises a compensation device, and a wire rod penetrates through the compensation device and then is wound on a wind-up roller; the compensation device comprises: a fixed box, which is internally provided with an axially through wire channel; the two compensation assemblies are arranged on the upper surface and the lower surface of the fixing box in a lifting mode respectively and abut against the wire rod; the twisting assembly is arranged in the fixed box in a lifting manner and is linked with the compensation assembly; when a wire rod penetrates through the fixing box, the two compensation assemblies are pressed on the upper surface and the lower surface of the wire rod respectively. After the wire is cut off, the broken end of the wire is pulled back by the compensation assembly and contracted into the fixing box, so that the broken end of the wire is attached to the side wall of the twisting assembly; one compensation assembly moves upwards to drive the twisting assembly to rotate in the winding direction of the wire rod, so that the broken end of the wire rod is twisted, and the broken end of the wire rod is prevented from loosening through the twisting assembly.

A steel ring threading and splicing device for ring spinning head, belong to ring spinning yarn automatic joint technical field, the present application in order to solve the existing technology in the steel ring threading process steel ring positioning unreliable and other problems. Including steel ring positioning device, steel ring positioning device includes crank, connecting rod, sliding block, air pipe and vacuum suction tube, guide is set on the shell before and after, sliding block and the guide sliding fit, drive rudder and the shell are connected, the one end of crank is connected with the output shaft of drive rudder, the other end of crank is sequentially articulated with sliding block through connecting rod, vacuum suction tube and air pipe are fixed on the left side of sliding block, the front part of air pipe is bent to right upper side, the front part of vacuum suction tube is bent downward, the front end suction hole of vacuum suction tube is located in the right upper side of the front end air hole of air pipe, steel ring positioning device is positioned to steel ring by the combination of suction and blowing, can make steel ring stop in the specified threading area.

The invention discloses an automatic joint robot tension active-disturbance-rejection fast response control device and method, and the device is characterized in that the device comprises a robot, a tension sensing device, a variable tension device and an electric control device, and the electric control device operates an algorithm based on active-disturbance-rejection control. Sensing of weak tension is established through a spring and lever model, and yarn breakage in the spun yarn splicing process can be effectively prevented. The two-section spun yarn tension control device can meet the tension requirements of different stages of spun yarn splicing, and the splicing success rate is increased. The force control performance is improved by adopting an active disturbance rejection control algorithm, and the stability of force tracking is improved by designing instruction filtering and an adaptive gain algorithm. The tension control stability in the automatic jointing process can be effectively improved, and the jointing success rate is increased.

It is disclosed a method of operating a service robot (9) of a ring spinning machine (1), which is displaceable along a row of spinning units (2) of the ring spinning machine (1). Each spinning unit (2) comprises a spindle (8), wherein the service robot (9) can be stopped at a specific spinning unit (2) in order to perform a service operation at the spinning unit (2); The method comprising the steps of storing in a memory (100, 200) different sets (A, B, C) of setting parameters (e, f, g) for the service robot (9), which set-ting parameters (e, f, g) depend on yarn characteristics and characteristics of the ring spinning machine (1); choosing a specific yarn to be produced on the spinning machine(1); and applying one of the sets (A, B, C) of setting parameters (e, f, g) to the service robot (9) according to the chosen yarn to be produced and the ring spinning machine (1) for use during the service operation. The invention as well related to a corresponding ring spinning machine.

The utility model relates to the technical field of pultrusion material production of glass fiber and carbon fiber etc. especially relates to a pneumatic yarn joining device, including pneumatic drive arrangement, still include: axial closed -loop chamber device, including main frame, limit block, the sliding block is arranged between main frame and limit block and slides, the air hole is set up along its axial in main frame, main frame sets up U type groove, the slide hole is set up in limit block, the connecting rod is arranged in the slide hole and slides, the spring is set up in connecting rod sleeve, the slide hole is located and sets up the limit ring, manual back -and -forth device is used for pulling the sliding block to move, the utility model has the following beneficial effect: high degree of automation: can automatically complete the joint of yarn, improves production efficiency, the reliability is strong: adopts pneumatic drive, and the action is stable and reliable, is applicable to the particularity of glass fiber and carbon fiber, simple operation: single hand can pull the trigger of the pull rod and buckle pressure air gun, therefore convenient for the operation of manual control device, simple and easy to use.

The present invention relates to a spinning machine which flexibly performs the capturing of the yarn on the side of the package. The spinning machine is provided with a suction device (29) and a suction nozzle (109). Depending on the main cause of the interruption of the spinning by the spinning device (23), the state at the start of the spinning by the spinning device (23), or the yarn type of the spun yarn (33), the use of which of the suction device (29) and the suction nozzle (109) is changed.

A connection fitting (1), and a dispensing system and a connection device comprising said connection fitting are provided. The connection fitting is adapted to connect a source of compressed air (S) to an air distributor assembly (200) of a device (100) for pneumatically connecting yarns or threads, and comprises a single inlet tube (2) provided at one end with a single inlet interface (20) configured to connect to the source of compressed air, branching at opposite ends into a pair of distribution tubes (3, 4) independent of each other, each distribution tube terminates in a respective outlet opening (30, 40), the outlet openings of the pair of distribution tubes being formed in a common attachment flange (5) configured to be coupled to an air distributor assembly (200) and at least partially overlapping a respective inlet opening (201, 202) of the air distributor assembly. The installation and management cost of the pneumatic connecting device is reduced, the use flexibility is improved, the structure and the construction are simple, and the cost effectiveness is high.