Adjustable air pipe corner connecting piece

Abstract

The utility model provides an adjustable air pipe corner connecting piece which comprises a bevel air pipe and connecting flanges, and the connecting flanges are correspondingly arranged at a vertical opening and a transverse opening of the bevel air pipe respectively. The connecting flange at least comprises an adjustable flange, the adjustable flange comprises an adjusting pipe and a flange plate, the flange plate is coaxially welded to one end of the adjusting pipe, and the other end of the adjusting pipe is connected into an opening of the bevel air pipe in a sleeved mode and can move in the extending direction of the opening of the bevel air pipe. According to the utility model, the adjustable flange is arranged, and the adjusting pipe is allowed to move in the opening of the bevel air pipe, so that not only is the connection problem caused by size errors solved, but also the flexibility and efficiency of field installation are greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of pneumatic conveying of grains, in particular to an adjustable air duct corner connecting piece. Background Technique

[0002] Pneumatic conveying utilizes the energy of air flow to convey granular materials along the air flow direction in a closed pipeline, which is a specific application of fluidization technology. The structure of a pneumatic conveying device is simple and easy to operate. For example, mechanical devices for pneumatically conveying grains such as grain pump trucks and grain suction machines mainly utilize the pipeline layout to convey grains horizontally, obliquely, or vertically. Among them, the air duct is a pipeline system for air conveyance and distribution, generally made of metal, non-metallic thin plates, or other materials. The air duct system is generally very long. To save the workload at the construction site, currently, air duct components of a set length are first fabricated in the factory. After transporting the air duct components to the construction site, the air duct components are then fixedly connected through flanges to form an air duct system. The cross-section of the air duct component is usually a square structure, which is formed by connecting four rectangular air duct plates. During the installation of the rectangular air duct, sometimes it is necessary to change the direction of the pipeline, which requires using a steering connector to connect two rectangular air ducts. However, during the installation of the connector, due to the positioning error during installation, it is easy to cause the flange of the connector to not match the pipeline, affecting the installation efficiency.

[0003] The prior art CN202222936591.6 discloses a reinforced connector for rectangular air duct turning, including a first flange, a second rectangular air duct, and a connector. A reinforcing structure is arranged inside the connector. Second flanges are installed at both ends of the connector. Sealing structures are arranged on both sides of one end of the second flange. Positioning structures are evenly arranged at the top and bottom of one end of the second flange. The positioning structure includes an anti-slip strip, a positioning block, and a positioning groove. The positioning blocks are evenly installed at the top and bottom of one end of the second flange. Although this utility model preliminarily fixes the flange through the cooperation of the positioning block and the positioning groove to achieve positioning, there are still the following problems:

[0004] 1. This utility model uses positioning blocks to position and connect the flange of one end of the connector with the flange of the pipeline. However, due to the existence of installation errors at the other end, it may cause the flange of the connector to not be accurately docked with the flange of the pipeline, and it is necessary to disassemble the installed pipeline to accurately dock, affecting the work efficiency.

[0005] 2. Since the existing ventilation ducts are produced according to the designed dimensions in the design drawings and then installed, during the actual installation of the ventilation ducts, there may be dimensional errors between the actual installation dimensions and the dimensions of the connecting parts. Therefore, it is necessary to cut or patch the pipes on site, which is rather troublesome for actual installation. Especially at the turning points, errors are likely to occur in the vertical or horizontal distances, resulting in the flange plates at both ends of the connecting parts being unable to align and fix with the flange plates of the ducts, thus affecting the construction efficiency. Summary of the Invention

[0006] In view of this, the purpose of the present utility model is to provide an adjustable air duct corner connecting part. By setting adjustable flanges, it allows the adjusting pipe to move within the opening of the angled air duct. This not only solves the connection problem caused by dimensional errors but also greatly improves the flexibility and efficiency of on-site installation.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0008] Provide an adjustable air duct corner connecting part, including: an angled air duct and connecting flanges, and the connecting flanges are respectively arranged at the vertical opening and the horizontal opening of the angled air duct; at least one of the connecting flanges includes an adjustable flange, and the adjustable flange includes an adjusting pipe and a flange plate. The flange plate is coaxially welded to one end of the adjusting pipe, and the other end of the adjusting pipe is sleeved within the opening of the angled air duct and can move along the extending direction of the opening of the angled air duct.

[0009] It should be noted that the angled air duct refers to a connecting part that is used to adapt to the complex structural layout of the ventilation ducts, enabling the air duct to change the running direction and allowing the branch ducts in different directions to communicate at the turning point; the vertical opening: refers to the opening of the air duct in the vertical direction; this opening is usually used to connect with the air ducts in the up and down directions. For example, if the turning direction of the angled air duct is from horizontal to vertical, then the vertical opening is the opening in the new direction after the turn. The horizontal opening: refers to the opening of the air duct in the horizontal direction; this opening is usually used to connect with the air ducts in the left and right directions. For example, if the turning direction of the angled air duct is from vertical to horizontal, then the horizontal opening is the opening in the new direction after the turn; in this solution, by setting the adjustable flange, the flange surface of the connecting part can be adjusted in position. By moving the adjusting pipe within the opening of the angled air duct, the relative position between the flange plate and the flange of another air duct can be adjusted, thereby achieving precise docking.

[0010] Preferably, an observation port is provided on one side of the angled air duct, and a door panel is provided outside the observation port. The door panel is covered on the observation port through a locking buckle.

[0011] It should be noted that the observation port is designed to facilitate observation of the internal conditions of the ventilation duct. The door panel is fixed to the observation port by a locking buckle and can be opened or closed manually. This design increases the operational flexibility of the duct system while also providing the ability to quickly open the observation port in an emergency, thereby enhancing safety.

[0012] Preferably, a material separation screen is provided on the observation port, and the material separation screen is detachably arranged on the observation port.

[0013] It should be noted that the setting of the material separation screen can not only prevent the leakage of materials inside the air duct, but also effectively prevent external particles and impurities from entering the air duct system, protect the internal materials from contamination, and ensure the quality of the transported materials; the detachable design makes the material separation screen easy to clean and replace regularly, simplifies the maintenance process and reduces maintenance costs.

[0014] Preferably, a valve assembly is provided on the angled air duct, and the valve assembly includes a driving cylinder, a rotating shaft and a hinge door; the driving cylinder is arranged on the outer wall of the angled air duct, the rotating shaft is passed through the upper end of the angled air duct, and is transmission-connected to the driving cylinder, the end of the hinge door is fixedly connected to the rotating shaft, and the hinge door can be driven to rotate by the rotating shaft to block the ventilation duct of the angled air duct.

[0015] It should be noted that the valve assembly is an important component of the air duct system for controlling airflow. It controls the opening or closing of the airflow in the air duct by adjusting the position of the hinge door, thereby achieving precise control of the air volume; specifically, when the driving cylinder receives the opening or closing signal, it will generate corresponding power to drive the rotating shaft to rotate. The rotation of the rotating shaft drives the hinge door to rotate. When the hinge door rotates to a certain angle, it can completely cover or expose the ventilation duct of the angled air duct, thereby achieving control of the airflow.

[0016] Preferably, the rotating shaft is arranged on the angled air duct through an adjusting device, and the rotating shaft can be arranged to move axially along the adjusting flange through the adjusting device, so that the hinge door can be sealed on the end surface of the adjusting flange.

[0017] It should be noted that the adjusting device allows the rotating shaft to move axially along the adjusting flange, which means that the position of the hinge door can be changed through the adjusting device, thereby changing its distance relative to the end face of the adjusting flange. Through this design, even if the adjusting flange is adjusted and moved, it can be ensured that the hinge door can be tightly sealed on the end face of the adjusting flange to ensure good sealing; the adjusting device can be a simple threaded fastener, a sliding guide rail or other types of mechanical structures to achieve axial movement of the rotating shaft; when the position of the hinge door needs to be adjusted, the operator can adjust the position of the rotating shaft through the adjusting device, so that the hinge door moves accordingly to adapt to the adjustment flanges in different positions.

[0018] Preferably, the adjusting device is a sliding support. Both ends of the rotating shaft are arranged on the angled air duct through the sliding support. Waist-shaped holes are provided on the angled air duct corresponding to the sliding support. The sliding support is arranged in the waist-shaped holes and can move axially along the waist-shaped holes.

[0019] It should be noted that the sliding support cooperates with the waist-shaped holes on the angled air duct to realize the adjustment of the position of the rotating shaft. The movement of the rotating shaft will drive the hinge door fixed thereto to move together, thereby changing the position of the hinge door relative to the end face of the adjusting flange. In this way, even if the position of the adjusting flange is adjusted, it can be ensured that the hinge door can tightly block the end face of the adjusting flange and maintain good sealing performance.

[0020] Preferably, the connecting flange includes a fixed flange and an adjusting flange. The fixed flange is arranged at the vertical opening of the angled air duct, and the adjusting flange is adjustably arranged at the horizontal opening of the angled air duct.

[0021] It should be noted that the fixed flange is installed at the vertical opening of the angled air duct, and its position is fixed. It is mainly used for docking with the standard flanges of the upstream or downstream air ducts. The fixed flange ensures the basic stability of the air duct connection and is the basic connection point between the connecting piece and the rest of the air duct system. Different from the fixed flange, the adjusting flange is arranged at the horizontal opening of the angled air duct and has adjustability, which means that it can move along the horizontal opening direction of the angled air duct to adapt to air ducts at different positions or minor dimensional differences that may occur during on-site installation. The combination of the fixed flange and the adjusting flange reduces the dependence on precise on-site measurement and pre-cutting, making the installation process simpler and faster. It not only solves the common dimensional matching problems in the angled connection of air ducts but also improves the convenience of installation and maintenance.

[0022] Preferably, a limiting mechanism is provided at one end of the adjusting pipe sleeved with the angled air duct. The limiting mechanism can prevent the adjusting pipe from disengaging from the opening of the angled air duct.

[0023] It should be noted that the design of the limiting mechanism is to ensure that the adjusting pipe will not accidentally slide out or disengage from the opening of the angled air duct during use. This is a very important safety measure because the accidental movement or detachment of the adjusting pipe may cause the air duct system to lose its airtightness, affect the normal operation of the system, and even pose greater safety hazards. The specific implementation methods of the limiting mechanism can be diversified. For example, it can be a simple snap system. When the adjusting pipe moves to a specific position, the snap automatically locks to prevent further movement. Another possibility is to use threaded fasteners to adjust the position of the adjusting pipe by tightening or loosening, and then tighten it to fix the adjusting pipe after determining the position. It is also possible to use elastic materials or spring-loaded devices. These devices lock the adjusting pipe through elastic force when the adjusting pipe reaches the preset position, and at the same time allow manual unlocking when needed.

[0024] Preferably, the limiting mechanism is a limiting strip, and the limiting strip is detachably arranged around the adjusting pipe on the outer side wall of the adjusting pipe.

[0025] It should be noted that the limiting strip is designed to surround the adjusting pipe, which can ensure that the limiting strip can play a role in all directions, effectively limit the movement range of the adjusting pipe, and prevent it from accidentally coming out in any direction; the limiting strip can adopt simple fastening mechanisms such as screws, snaps or buckles, so that the operator can easily install, adjust or remove the limiting strip without using special tools or spending too much time.

[0026] Advantages of the present utility model:

[0027] The adjustable air duct corner connector provided by the present utility model enables the flange surface of the connector to be adjusted in position within a certain range by setting an adjustable flange. By moving the adjusting pipe within the opening of the angled air duct, the flange of another air duct can be accurately aligned. Even if there are slight deviations between the actual on-site dimensions and the design dimensions, good docking between the flanges can be ensured, avoiding the cumbersome work of on-site cutting or repositioning due to dimensional errors; due to the movable characteristics of the adjustable flange, installers can fine-tune the flange position without completely disassembling the installed pipeline, greatly shortening the installation time and improving work efficiency; at the same time, this design also reduces the potential damage risk caused by repeated disassembly and installation, ensuring the installation quality. Brief Description of the Drawings

[0028] Figure 1 It is a three-dimensional structural schematic diagram of one side of the door panel of an adjustable air duct corner connector according to Embodiment 1 of the present utility model.

[0029] Figure 2 It is a three-dimensional structural schematic diagram of one side of the driving cylinder of an adjustable air duct corner connector according to Embodiment 1 of the present utility model.

[0030] Figure 3 This is a cross-sectional view of an adjustable air duct corner connector according to Embodiment 1 of the present utility model.

[0031] Figure 4 This is a structural schematic diagram of the valve assembly according to Embodiment 1 of the present utility model.

[0032] Figure 5 This is a structural schematic diagram of the angled air duct according to Embodiment 1 of the present utility model.

[0033] Figure 6 This is a structural schematic diagram of the sliding support according to Embodiment 1 of the present utility model.

[0034] Figure 7 This is a structural schematic diagram of the adjusting flange according to Embodiment 1 of the present utility model.

[0035] Figure 8 This is a cross-sectional view of an adjustable air duct corner connector according to Embodiment 2 of the present utility model.

[0036] Figure 9 This is a structural schematic diagram of the adjusting flange according to Embodiment 2 of the present utility model.

[0037] In the figure: 1, angled air duct; 11, vertical opening; 12, horizontal opening; 13, waist-shaped hole; 2, connecting flange; 21, adjusting flange; 211, adjusting pipe; 212, flange plate; 22, fixed flange; 3, observation port; 4, door panel; 5, locking buckle; 6, material separating screen; 7, valve assembly; 71, driving cylinder; 72, rotating shaft; 73, hinged door; 8, limiting mechanism; 81, limiting strip; 9, adjusting device; 91, sliding support.

[0038] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] Embodiment 1

[0041] As Figures 1 - 7As shown in the figure, an adjustable air duct corner connector includes: a folded air duct 1 and a connecting flange 2, and the connecting flange 2 is respectively arranged at the vertical opening 11 and the horizontal opening 12 of the folded air duct 1;

[0042] The connecting flange 2 includes a fixed flange 22 and an adjustable flange 21. The fixed flange 22 is arranged at the vertical opening 11 of the folded air duct 1, and the adjustable flange 21 is adjustably arranged at the horizontal opening 12 of the folded air duct 1. The adjustable flange 21 includes an adjusting pipe 211 and a flange plate 212. The flange plate 212 is coaxially welded to one end of the adjusting pipe 211. The other end of the adjusting pipe 211 is sleeved in the opening of the folded air duct 1 and can move along the extending direction of the opening of the folded air duct 1.

[0043] One side of the folded air duct 1 is provided with an observation port 3, and a door panel 4 is arranged outside the observation port 3. The door panel 4 is covered on the observation port 3 through a locking buckle 5.

[0044] A material separating screen 6 is arranged on the observation port 3, and the material separating screen 6 is detachably arranged on the observation port 3.

[0045] A valve assembly 7 is arranged on the folded air duct 1. The valve assembly 7 includes a driving cylinder 71, a rotating shaft 72 and a hinge door 73. The driving cylinder 71 is arranged on the outer wall of the folded air duct 1. The rotating shaft 72 penetrates through the upper end of the folded air duct 1 and is in transmission connection with the driving cylinder 71. The end of the hinge door 73 is fixedly connected to the rotating shaft 72, and the hinge door 73 can be driven by the rotating shaft 72 to rotate to block the ventilation duct of the folded air duct 1.

[0046] The rotating shaft 72 is arranged on the folded air duct 1 through an adjusting device 9, and the rotating shaft 72 can be moved along the axial direction of the adjustable flange 21 through the adjusting device 9, so that the hinge door 73 can block the end face of the adjustable flange 21.

[0047] The adjusting device 9 is a sliding support 91. Both ends of the rotating shaft 72 are arranged on the folded air duct 1 through the sliding support 91. A kidney-shaped hole 13 is correspondingly arranged on the folded air duct 1 for the sliding support 91. The sliding support 91 is arranged in the kidney-shaped hole 13 and can move along the axial direction of the kidney-shaped hole 13.

[0048] The working principle and usage method of the adjustable air duct corner connector in this embodiment:

[0049] An adjustable air duct corner connector provided in this embodiment enables the connection part of the connector to be adjusted in position within a certain range through the adjustable flange 21. The movement of the adjusting pipe 211 within the opening of the angled air duct 1 can accurately align the flange surface of the adjustable flange 21 with the flange surface of another air duct. Even if there are slight deviations between the actual on-site dimensions and the designed dimensions, it can ensure good docking between the flanges, avoiding the cumbersome work of on-site cutting or repositioning due to dimensional errors. The fixed flange 22 is arranged at the vertical opening 11 of the angled air duct 1 with a fixed position, mainly used for docking with the standard flanges of the upstream or downstream air ducts to ensure the basic stability of the air duct connection; the integration of the valve assembly 7, especially the hinge door 73 controlled by the driving cylinder 71, realizes precise control of the air flow in the air duct, which is particularly beneficial for application scenarios that require precise air volume adjustment, especially when used on the air duct of a grain suction machine, and the air volume adjustment of the grain suction machine is the most critical. The door panel 4 outside the observation port 3 is fixed by the locking buckle 5, can be manually opened and closed, and can observe the conveying situation inside the air duct in real time, increasing the operation flexibility and safety. The sliding support 91 can move within the waist-shaped hole 13, enabling the rotating shaft 72 to move axially, thereby adjusting the position of the hinge door 73 to ensure that it can block the end face of the adjustable flange 21 and provide a good sealing effect.

[0050] During use, install other air ducts of the grain suction machine, and confirm that all components are intact, including the angled air duct 1, fixed flange 22, adjustable flange 21, door panel 4, partition screen 6, valve assembly 7, etc.; prepare the necessary installation tools, such as wrenches, screwdrivers, etc., and the sealing materials that may be required; align the fixed flange 22 of the connector with the standard flange of the upstream or downstream air duct of the grain suction machine, and use appropriate fasteners (such as bolts and nuts) to preliminarily connect the fixed flange 22 with the standard flange. Then, according to the actual layout and dimensions of the on-site air duct, move the adjusting pipe 211 of the adjustable flange 21 until its flange plate 212 is aligned with the corresponding air duct flange. This process may require multiple fine-tuning until the flange surfaces are fully fitted, and then lock the fixed flange 22 and the adjustable flange 21 through fasteners to complete the installation of the connector. Then, by adjusting the position of the sliding support 91 within the waist-shaped hole 3, the hinge door 73 can be closely fitted with the end face of the adjusting pipe 211 when blocking. After completing the above steps, comprehensively check the sealing performance and firmness of all connection points, test the responsiveness of the valve assembly 7 to ensure that the door panel 4 and the hinge door 73 can be opened and closed freely, and at the same time verify whether the installation of the partition screen 6 is correct. Finally, conduct an overall commissioning of the air duct system to ensure that all components work in coordination.

[0051] Embodiment 2

[0052] As Figure 8 and Figure 9As shown, an adjustable duct corner connector of this embodiment includes: an angled duct 1, a connecting flange 2, wherein the connecting flange 2 includes two adjustable flanges 21, which are respectively arranged at the vertical opening 11 and the horizontal opening 12 of the angled duct 1;

[0053] The adjustable flange 21 includes an adjusting tube 211 and a flange 212. The flange 212 is coaxially welded to one end of the adjusting tube 211. The other end of the adjusting tube 211 is sleeved in the opening of the angled air duct 1 and can move along the extension direction of the opening of the angled air duct 1.

[0054] An observation port 3 is provided on one side of the angled air duct 1 , and a door panel 4 is provided on the outer side of the observation port 3 . The door panel 4 is covered on the observation port 3 by a locking buckle 5 .

[0055] The observation port 3 is provided with a material separation screen 6 , and the material separation screen 6 is detachably arranged on the observation port 3 .

[0056] The angled air duct 1 is provided with a valve assembly 7, and the valve assembly 7 includes a driving cylinder 71, a rotating shaft 72 and a hinge door 73; the driving cylinder 71 is arranged on the outer wall of the angled air duct 1, the rotating shaft 72 is passed through the upper end of the angled air duct 1, and is transmission-connected to the driving cylinder 71, and the end of the hinge door 73 is fixedly connected to the rotating shaft 72, and the hinge door 73 can be driven to rotate by the rotating shaft 72 to block the ventilation duct of the angled air duct 1.

[0057] The rotating shaft 72 is arranged on the angled air duct 1 through the adjusting device 9, and the rotating shaft 72 can be moved axially along the adjusting flange 21 through the adjusting device 9, so that the hinge door 73 can be blocked on the end surface 21 of the adjusting flange.

[0058] The adjusting device 9 is a sliding support 91, and the two ends of the rotating shaft 72 are arranged on the angled air duct 1 through the sliding support 91. The angled air duct 1 is provided with a waist-shaped hole 13 corresponding to the sliding support 91. The sliding support 91 is arranged in the waist-shaped hole 13 and can move axially along the waist-shaped hole 13.

[0059] A limiting mechanism 8 is provided at one end of the regulating tube 211 sleeved with the angled air duct 1 , and the limiting mechanism 8 can prevent the regulating tube 211 from being separated from the opening of the angled air duct 1 .

[0060] The limiting mechanism 8 is a limiting strip 81 , and the limiting strip 81 is detachably disposed around the regulating tube 211 and on the outer side wall of the regulating tube 211 .

[0061] Compared with Example 1:

[0062] An adjustable air duct corner connector provided in this embodiment enables the air duct corner connector to have adjustment capabilities in two directions through the design of the double-adjustable flange 21. It can not only adapt to the size differences of the air ducts connected to it in the horizontal direction but also cope with the changes in the longitudinal dimensions, improving the adaptability and installation efficiency of the connector in complex layouts. The design of the limit mechanism 8 (limit strip 81) ensures the stability of the adjustment pipe 211 during use, preventing it from accidentally sliding out or detaching from the opening of the angled air duct 1. The limit strip 81 is designed to be arranged around the adjustment pipe 211 on the outer side wall of the adjustment pipe 211. The detachable feature ensures the convenience of installation, adjustment, or removal of the limit strip 81, while effectively restricting the movement range of the adjustment pipe 211 and preventing it from accidentally slipping out in any direction, ensuring the sealing and safety of the system. This is particularly important in the configuration of the double-adjustable flange 21 because maintaining the stable position of the adjustment pipe 211 is crucial for the sealing and functionality of the entire air duct system.

[0063] During use, according to the actual layout and dimensions of the on-site air ducts, independently adjust the adjustment pipes 211 of each adjustment flange 21 until the flange plate 212 is completely aligned with the corresponding air duct flange, and then fasten them with fasteners. The limit strip 81 lock can ensure that the adjustment flange 21 will not fall off from the opening during the adjustment process.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present invention, only used to illustrate the technical solutions of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

[0065] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0066] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "setting" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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.

Claims

1. An adjustable duct corner connector, comprising: An angled air duct (1), a connecting flange (2), wherein the connecting flange (2) is respectively arranged at a vertical opening (11) and a horizontal opening (12) of the angled air duct (1); the characteristics are: The connecting flange (2) comprises at least one adjustable flange (21), the adjustable flange (21) comprising an adjusting tube (211) and a flange plate (212), the flange plate (212) being coaxially welded to one end of the adjusting tube (211), the other end of the adjusting tube (211) being sleeved in the opening of the angled air duct (1) and being capable of moving along the extension direction of the opening of the angled air duct (1).

2. The adjustable air duct corner connector according to claim 1, characterized in that: An observation port (3) is provided on one side of the angled air duct (1), a door panel (4) is provided on the outer side of the observation port (3), and the door panel (4) is covered on the observation port (3) by means of a locking buckle (5).

3. The adjustable air duct corner connector according to claim 2, characterized in that: The observation port (3) is provided with a material separation screen (6), and the material separation screen (6) is detachably arranged on the observation port (3).

4. The adjustable air duct corner connector according to claim 1, characterized in that: The angled air duct (1) is provided with a valve assembly (7), and the valve assembly (7) comprises a driving cylinder (71), a rotating shaft (72) and a hinge door (73); the driving cylinder (71) is arranged on the outer wall of the angled air duct (1), the rotating shaft (72) is passed through the upper end of the angled air duct (1) and is transmission-connected to the driving cylinder (71), and the end of the hinge door (73) is fixedly connected to the rotating shaft (72), and the hinge door (73) can be driven to rotate by the rotating shaft (72) to block the ventilation duct of the angled air duct (1).

5. The adjustable air duct corner connector according to claim 4, characterized in that: The rotating shaft (72) is arranged on the angled air duct (1) via an adjusting device (9), and the rotating shaft (72) can be moved axially along the adjusting flange (21) via the adjusting device (9), so that the hinge door (73) can be sealed on the end surface of the adjusting flange (21).

6. The adjustable air duct corner connector according to claim 5, characterized in that: The adjusting device (9) is a sliding support (91), and the two ends of the rotating shaft (72) are arranged on the angled air duct (1) through the sliding supports (91). The angled air duct (1) is provided with a waist-shaped hole (13) corresponding to the sliding support (91). The sliding support (91) is arranged in the waist-shaped hole (13) and can move axially along the waist-shaped hole (13).

7. The adjustable air duct corner connector according to claim 1, characterized in that: The connecting flange (2) comprises a fixed flange (22) and an adjustable flange (21); the fixed flange (22) is arranged at the vertical opening (11) of the angled air duct (1); and the adjustable flange (21) is adjustably arranged at the horizontal opening (12) of the angled air duct (1).

8. The adjustable air duct corner connector according to claim 1, characterized in that: One end of the regulating tube (211) sleeved with the angled air duct (1) is provided with a limiting mechanism (8), and the limiting mechanism (8) can prevent the regulating tube (211) from being separated from the opening of the angled air duct (1).

9. The adjustable air duct corner connector according to claim 8, characterized in that: The limiting mechanism (8) is a limiting strip (81), and the limiting strip (81) is detachably arranged around the regulating tube (211) and on the outer side wall of the regulating tube (211).

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