Mine air duct connecting device

Abstract

The utility model provides a mine air duct connecting device, which belongs to the field of mine ventilation devices and comprises a fixed ring, an adjusting ring and at least one telescopic inner ring, the central axis of each telescopic inner ring is collinear with the central axis of the fixed ring, the fixed ring is positioned on the periphery of each telescopic inner ring, and the adjusting ring is rotatably connected with the fixed ring. Each telescopic inner ring comprises a plurality of movable blocks and a plurality of connecting rods, the movable blocks and the connecting rods are arranged in a circumferential array mode, one end of each connecting rod is connected with one movable block, the other end of each connecting rod penetrates through the fixing ring to be slidably connected with the adjusting ring, and when the adjusting ring rotates clockwise relative to the fixing ring, the adjusting ring is connected with the telescopic inner ring. The distance between the outer side wall of each movable block and the inner side wall of the fixed ring is gradually shortened, and when the adjusting ring rotates anticlockwise relative to the fixed ring, the distance between every two adjacent movable blocks is gradually shortened. The utility model aims to solve the problems that the connection of the air duct is more complicated, time-consuming and labor-consuming, and achieves the technical effect that the quick connection of the mine air duct is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of mine ventilation devices, in particular to a mine air duct connecting device. Background Art

[0002] At present, mine shaft ventilation uses local ventilators for forced ventilation, with soft ducts as the air supply path. With the development of science and technology, the power of local ventilators has become increasingly powerful, and the air supply distance has become increasingly longer. This has increased the workload of connecting ducts, and duct clamps are provided at both ends of the ducts for connection. In the existing technology, the connection method between ducts is to first insert the duct clamp of the first section of the duct into the duct clamp of the second section of the duct; then, use fine iron wire to wrap it; next, wrap the edge of the duct in reverse; finally, use duct glue to stick the joint with strips of cloth. This method is time-consuming and labor-intensive, and the process is complicated, which is not conducive to the rapid connection of ducts in special circumstances under coal mines. Utility Model Content

[0003] The utility model provides a mine air duct connecting device, which is used to solve the problems in the prior art that the connection of the mine air duct is relatively complicated, time-consuming and labor-intensive, and realizes the rapid connection of the mine air duct.

[0004] The utility model provides a mine air duct connecting device, comprising a fixed ring, an adjusting ring and at least one telescopic inner ring, the central axis of each telescopic inner ring is colinear with the central axis of the fixed ring, the fixed ring is located at the outer periphery of each telescopic inner ring, the adjusting ring is rotatably connected to the fixed ring, each telescopic inner ring comprises a plurality of movable blocks and a plurality of connecting rods arranged in a circular array, one end of each connecting rod is connected to a movable block, and the other end of each connecting rod passes through the fixed ring and is slidably connected to the adjusting ring, when the adjusting ring rotates clockwise relative to the fixed ring, the distance between the outer side wall of each movable block and the inner side wall of the fixed ring gradually becomes shorter, and when the adjusting ring rotates counterclockwise relative to the fixed ring, the distance between two adjacent movable blocks gradually becomes closer.

[0005] According to the mine air duct connection device of the utility model, the coordinated arrangement of the fixed ring, the adjusting ring and the telescopic inner ring ensures that when the air duct needs to be connected, it is only necessary to rotate the adjusting ring by hand or with a wrench so that the fixed ring cooperates with the multiple movable blocks of the telescopic inner ring to clamp the air duct, thereby realizing the quick connection of the air duct; in addition, the device has a simple structure and is easy to process and manufacture. The device uses a simple mechanical structure to maintain the stability of the device and is not affected by the level of human operation.

[0006] In addition, the mine air duct connection device according to the utility model may also have the following additional technical features:

[0007] In some embodiments of the present invention, the adjustment ring includes at least one adjustment ring, and the number of the telescopic inner rings is the same as the number of the adjustment rings;

[0008] A plurality of first adjustment grooves are provided on the inner side wall of each adjustment ring, and a plurality of second adjustment grooves are provided on the surface of each adjustment ring in the form of a circular array. The plurality of first adjustment grooves are connected to the plurality of second adjustment grooves in a one-to-one correspondence, and the distance between each second adjustment groove and the axis of the corresponding adjustment ring gradually increases from one end of the second adjustment groove to the other end of the second adjustment groove. The end of each connecting rod away from the corresponding movable block passes through the first adjustment groove and is slidably connected to the second adjustment groove.

[0009] By adopting the above embodiment, the distance between each second adjustment groove and the axis of the corresponding adjustment ring is gradually increased from one end of the second adjustment groove to the other end of the second adjustment groove, so that when the corresponding adjustment ring is rotated, multiple connecting rods can be driven to move and the corresponding movable blocks can be driven to move along the radial direction of the fixed ring, thereby realizing the rapid connection of the mine air duct.

[0010] In some embodiments of the present invention, a limiting block is further included, and a limiting block is provided on the inner side wall of each second adjustment slot.

[0011] By adopting the above embodiment, the setting of the limit block can resist the connecting rod and prevent the connected air duct from loosening again.

[0012] In some embodiments of the present invention, each connecting rod includes a connecting cross rod and a connecting sliding rod, the connecting sliding rod can be slidably connected to the second adjustment groove, one end of the connecting cross rod is connected to the corresponding movable block, and the other end of the connecting cross rod passes through the first adjustment groove and is connected to the connecting sliding rod, and the connecting sliding rod and the connecting cross rod are perpendicular to each other.

[0013] By adopting the above embodiment, the coordinated arrangement of the connecting cross bar and the connecting slide bar realizes a reliable connection between the movable block and the corresponding second adjustment slot.

[0014] In some embodiments of the present invention, at least one slot is formed on the outer side wall of each movable block.

[0015] By adopting the above embodiment, the provision of the clamping slot enables the iron ring at the end of the air duct to be clamped on the clamping slot when the air duct is connected, thereby ensuring the stability of the air duct connection.

[0016] In some embodiments of the present invention, a first handle is further included, and at least one first handle is connected to the outer side wall of the fixing ring.

[0017] By adopting the above embodiment, the provision of the first handle increases the convenience of adjusting and rotating the adjusting ring relative to the fixing ring.

[0018] In some embodiments of the present invention, a first hole is formed on the first handle.

[0019] By adopting the above embodiment, the provision of the first hole enables the first handle to be used as a hanging point.

[0020] In some embodiments of the present invention, a second handle is further included, and at least one second handle is connected to the outer side wall of the adjustment ring.

[0021] By adopting the above embodiment, the provision of the second handle further increases the convenience of connecting the device to the hair dryer.

[0022] In some embodiments of the present invention, at least one annular groove is formed on the outer side wall of the fixing ring, the number of the adjustment rings is the same as the number of the annular grooves, and the adjustment rings are rotatably connected in the annular grooves in a one-to-one correspondence.

[0023] By adopting the above embodiment, the provision of the annular groove ensures the reliability of the rotatable connection between the adjustment ring and the fixing ring.

[0024] In some embodiments of the present invention, the cross-section of each limiting block is arc-shaped.

[0025] By adopting the above embodiment, the arc-shaped cross-sectional shape of the limit block is set to ensure that when the device needs to be used to connect the air duct, the connecting rod can relatively easily pass through the limit block and abut against the limit block and the inner wall of the second adjustment groove. When the air duct needs to be disassembled, it is also relatively easy to rotate the adjustment ring in the opposite direction, thereby achieving a quick and reliable connection of the air duct and making disassembly more convenient.

[0026] In summary, this application has the following beneficial technical effects:

[0027] First, by coordinating the fixed ring, the adjusting ring and the telescopic inner ring, when the air duct needs to be connected, it is only necessary to turn the adjusting ring by hand or with a wrench so that the fixed ring and the multiple movable blocks of the telescopic inner ring cooperate to clamp the air duct, thereby realizing the quick connection of the air duct; in addition, the device has a simple structure and is easy to process and manufacture. The device uses a simple mechanical structure to maintain the stability of the device and is not affected by the level of human operation.

[0028] Second, by setting the distance between each second adjustment groove and the axis of the corresponding adjustment ring to gradually increase from one end of the second adjustment groove to the other end of the second adjustment groove, when the corresponding adjustment ring is rotated, multiple connecting rods can be driven to move and the corresponding movable blocks can be driven to move along the radial direction of the fixed ring, thereby realizing the rapid connection of the mine air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0030] Figure 1 A first perspective view of a mine air duct connection device according to some embodiments of the present invention is schematically shown.

[0031] Figure 2 A second perspective view schematically illustrates a perspective view of a mine air duct connection device according to some embodiments of the present invention.

[0032] Figure 3 A perspective view schematically shows a mine air duct connection device according to some embodiments of the present invention without the first handle and the second handle.

[0033] Figure 4 A three-dimensional diagram schematically shows the connection between the adjustment ring and the telescopic inner ring of the mine air duct connection device according to some embodiments of the present invention.

[0034] Figure 5 A three-dimensional view schematically shows a fixing ring of a mine air duct connection device according to some embodiments of the present invention.

[0035] Figure 6 The figure schematically shows a stereoscopic view of an adjustment ring of a mine air cylinder connection device according to some embodiments of the present invention.

[0036] Figure 7 A perspective view schematically shows a fixing ring of a mine air duct connection device according to some embodiments of the present invention without a first handle.

[0037] Figure 8 A three-dimensional view schematically shows an adjustment ring of a mine air duct connection device according to some embodiments of the present invention.

[0038] Figure 9 A partially enlarged view of an adjustment ring of a mine air duct connection device according to some embodiments of the present utility model is schematically shown.

[0039] Figure 10 A stereoscopic view of a telescopic inner ring of a mine air duct connection device according to some embodiments of the present invention is schematically shown.

[0040] Figure 11 A three-dimensional diagram schematically shows the connection between the movable block and the connecting rod of the mine air duct connecting device according to some embodiments of the present invention.

[0041] Reference numerals:

[0042] 1. Fixed ring, 11. Ring groove, 12. Through hole, 13. First handle, 131. First hole, 2. Adjusting ring, 21. Adjusting ring, 211. First adjusting groove, 212. Second adjusting groove, 213. Limit block, 22. Second handle, 221. Second hole, 3. Telescopic inner ring, 31. Movable block, 311. Slot, 4. Connecting rod, 41. Connecting cross bar, 42. Connecting slide bar. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an", and "" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain", and "have" are inclusive and therefore specify the presence of the stated features, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented rotated 90 degrees or in other orientations and the spatially relative descriptors used herein are interpreted accordingly.

[0047] like Figures 1 to 11 As shown, according to the embodiment of the first aspect of the present utility model, a mine wind duct connection device is proposed, including a fixed ring 1, an adjusting ring 2 and at least one telescopic inner ring 3, the central axis of each telescopic inner ring 3 is collinear with the central axis of the fixed ring 1, the fixed ring 1 is located on the outer periphery of each telescopic inner ring 3, the adjusting ring 2 is rotatably connected to the fixed ring 1, each telescopic inner ring 3 includes a plurality of movable blocks 31 and a plurality of connecting rods 4 arranged in a circular array, one end of each connecting rod 4 is connected to a movable block 31, and the other end of each connecting rod 4 passes through the fixed ring 1 and is slidably connected to the adjusting ring 2. When the adjusting ring 2 rotates clockwise relative to the fixed ring 1, the distance between the outer wall of each movable block 31 and the inner wall of the fixed ring 1 gradually becomes shorter. When the adjusting ring 2 rotates counterclockwise relative to the fixed ring 1, the distance between two adjacent movable blocks 31 gradually becomes closer.

[0048] In the above embodiment, it should be noted that the cross-sectional shapes of the fixed ring 1, the adjustment ring 2 and the telescopic inner ring 3 are all circular rings, the cross-sectional shape of each movable block 31 is an arc shape, and multiple movable blocks 31 are combined to form a circular telescopic inner ring 3.

[0049] When the number of telescopic inner rings 3 is one, the connecting rod 4 is connected to the center of the corresponding movable block 31. When the two air tubes are connected, the two air tubes are inserted into the gap between the telescopic inner ring 3 and the fixed ring 1, and the ends of the air tubes are in contact with the connecting rod. Then, the adjusting ring 2 is rotated to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the two air tubes are clamped, so that the connection of the two air tubes is completed. At this time, one of the air tubes is located above the connecting rod 4, and the other air tube is located below the connecting rod 4.

[0050] When there are two telescopic inner rings 3, the two telescopic inner rings 3 are spaced apart from each other from top to bottom, and the connecting rod 4 is connected to one side of the corresponding movable block 31. When the two air tubes are connected, one of the tubes is inserted into the gap between one of the telescopic inner rings 3 and the fixed ring 1, and the end of the air tube is in contact with the corresponding connecting rod. The other tube is inserted into the gap between the other telescopic inner ring 3 and the fixed ring 1, and the end of the air tube is in contact with the connecting rod 4. Then, the adjusting ring 2 is rotated to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the two air tubes are clamped, so that the connection of the two air tubes is completed. At this time, the multiple connecting rods of the two telescopic inner rings 3 are in contact with the two side wall edges of the telescopic inner ring 3 that are close to each other.

[0051] When there are multiple telescopic inner rings 3, the multiple telescopic inner rings 3 are spaced apart from top to bottom, and the connecting rod 4 is connected to one side of the corresponding movable block 31. When the two air tubes are connected, one of the tubes is inserted into the gap between the telescopic inner ring 3 at the top and the fixed ring 1, and the end of the air tube is in contact with the corresponding connecting rod 4. The other tube is inserted into the gap between the telescopic inner ring 3 at the bottom and the fixed ring 1, and the end of the air tube is in contact with the connecting rod 4. Then, the adjusting ring 2 is rotated to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the two air tubes are clamped, so that the connection of the two air tubes is completed. At this time, the multiple connecting rods of the two telescopic inner rings 3 are in contact with the two side wall edges of the telescopic inner ring 3 that are close to each other.

[0052] Specifically, a plurality of through holes 12 are provided on the side wall of the fixing ring 1 , and each connecting rod 4 passes through the through hole 12 and is slidably connected to the adjusting ring 2 .

[0053] The technical effect achieved by the above embodiment is: through the coordinated arrangement of the fixed ring 1, the adjusting ring 2 and the telescopic inner ring 3, when the air duct needs to be connected, it is only necessary to rotate the adjusting ring by hand or a wrench so that the fixed ring 1 and the multiple movable blocks 31 of the telescopic inner ring 3 cooperate to clamp the air duct, thereby realizing the quick connection of the air duct; in addition, the device has a simple structure and is easy to process and manufacture. The device uses a simple mechanical structure to maintain the stability of the device and is not affected by the level of human operation.

[0054] Optional, such as Figures 1 to 4 and Figures 6 to 10 As shown, the adjustment ring 2 includes at least one adjustment ring 21, and the number of the telescopic inner rings 3 is the same as the number of the adjustment rings 21;

[0055] A plurality of first adjustment grooves 211 are provided on the inner side wall of each adjustment ring 21, and a plurality of second adjustment grooves 212 are provided on the surface of each adjustment ring 21 in the form of a circular array. The plurality of first adjustment grooves 211 and the plurality of second adjustment grooves 212 are interconnected in a one-to-one correspondence. The distance between each second adjustment groove 212 and the axis of the corresponding adjustment ring 21 gradually increases from one end of the second adjustment groove 212 to the other end of the second adjustment groove 212. The end of each connecting rod 4 away from the corresponding movable block 31 passes through the first adjustment groove 211 and is slidably connected to the second adjustment groove 212.

[0056] In the above optional embodiment, it should be noted that the number of the second adjustment slots 212 is the same as the number of the movable blocks 31 .

[0057] When the number of the adjustment ring 21 is one, the number of the telescopic inner ring 3 is also one. When connecting the two air ducts, both air ducts are inserted into the gap between the telescopic inner ring 3 and the fixed ring 1, and the ends of the air ducts are in contact with the corresponding connecting rods 4. The adjustment ring 21 is rotated to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the two air ducts are clamped, and the connection of the two air ducts is completed.

[0058] When the number of adjustment rings 21 is at least two, the number of telescopic inner rings 3 is also at least two. At this time, there are two ways to connect the two air ducts. Method 1: first insert the upper air duct into the gap between the top telescopic inner ring 3 and the fixed ring 1, and the end of the air duct is in contact with the corresponding connecting rod 4. Rotate the top adjustment ring 21 to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the upper air duct is clamped. Then insert the lower air duct into the gap between the bottom telescopic inner ring 3 and the fixed ring 1, and the end of the air duct is in contact with the corresponding connecting rod 4. Rotate the bottom adjustment ring 21 to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the lower air duct is clamped. The connection of the two air ducts is completed.

[0059] Method 2: Connect the second handle 22 to the side walls of at least two adjustment rings 21, and use the second handle 22 to connect at least two adjustment rings 21 into one. At this time, insert one of the tubes into the gap between the telescopic inner ring 3 and the fixed ring 1 at the top, and the end of the air tube is in contact with the corresponding connecting rod 4. The other tube is inserted into the gap between the telescopic inner ring 3 and the fixed ring 1 at the bottom, and the end of the air tube is in contact with the connecting rod 4. Then, rotate the adjusting ring 2 to drive the multiple movable blocks 31 of the telescopic inner ring 3 to move toward the inner side wall of the fixed ring 1 until the two air tubes are clamped, so that the connection of the two air tubes is completed.

[0060] Each first adjustment slot 211 and each second adjustment slot 212 are both in the shape of an elongated strip, and the bottom surface of the first adjustment slot 211 is a side surface of the corresponding second adjustment slot 212 .

[0061] The beneficial effect of the above-mentioned optional embodiment is: by setting the distance between each second adjustment groove 212 and the axis of the corresponding adjustment ring 21 to gradually increase from one end of the second adjustment groove 212 to the other end of the second adjustment groove 212, when the corresponding adjustment ring 21 is rotated, multiple connecting rods 4 can be driven to move and the corresponding movable blocks 31 can be driven to move along the radial direction of the fixed ring 1, thereby realizing the rapid connection of the mine air duct.

[0062] Optional, such as Figure 6 、 Figure 8 and Figure 9 As shown, a limiting block 213 is further included, and a limiting block 213 is provided on the inner side wall of each second adjustment slot 212 .

[0063] In the above optional embodiment, it should be noted that the limit block 213 is integrally formed with the inner wall of the second adjustment slot 212. When in operation, the limit block 213 blocks the connecting rod 4 to prevent the connected air duct from loosening again.

[0064] The beneficial effect of the above optional embodiment is that the setting of the limit block 213 can resist the connecting rod 4 to prevent the connected air duct from loosening again.

[0065] Optional, such as Figure 10 and Figure 11 As shown, each connecting rod 4 includes a connecting cross bar 41 and a connecting slide bar 42. The connecting slide bar 42 can be slidably connected to the second adjustment groove 212. One end of the connecting cross bar 41 is connected to the corresponding movable block 31, and the other end of the connecting cross bar 41 passes through the first adjustment groove 211 and is connected to the connecting slide bar 42. The connecting slide bar 42 and the connecting cross bar 41 are perpendicular to each other.

[0066] In the above optional embodiment, it should be noted that the shape formed by the connection between the connecting slide rod 42 and the corresponding connecting cross rod 41 is a "T" shape, and the connecting slide rod 42 is inserted into the second adjustment groove 212 and is slidably connected to the second adjustment groove 212.

[0067] The beneficial effect of the above optional embodiment is that a reliable connection between the movable block 31 and the corresponding second adjustment slot 212 is achieved through the cooperative arrangement of the connecting cross bar 41 and the connecting slide bar 42 .

[0068] Optional, such as Figure 10 and Figure 11 As shown, at least one slot 311 is formed on the outer side wall of each movable block 31 .

[0069] In the above optional embodiment, it should be noted that the cross-sectional shape of the latching slot 311 is semicircular, and the latching slot 311 passes through from one end of the movable block 31 to the other end of the movable block 31 .

[0070] The beneficial effect of the above optional embodiment is that the arrangement of the clamping slot 311 enables the iron ring at the end of the air duct to be clamped on the clamping slot 311 when the air duct is connected, thereby ensuring the stability of the air duct connection.

[0071] Optional, such as Figure 1 、 Figure 2 and Figure 5 As shown, it also includes a first handle 13 , and the outer side wall of the fixing ring 1 is connected to at least one first handle 13 .

[0072] Optional, such as Figure 1 、 Figure 2 and Figure 5 As shown, a first hole 131 is defined in the first handle 13 .

[0073] In the above optional embodiment, it should be noted that the first handle 13 and the fixing ring 1 are connected by screw connection or welding.

[0074] The beneficial effects of the above optional embodiment are: the provision of the first handle 13 increases the convenience of adjusting and rotating the adjusting ring 2 relative to the fixing ring 1. The provision of the first hole 131 enables the first handle 13 to be used as a hanging point.

[0075] Optional, such as Figure 1 、 Figure 2 and Figure 6 As shown, a second handle 22 is further included. At least one second handle 22 is connected to the outer side wall of the adjustment ring 2 .

[0076] In the above optional embodiment, it should be noted that the second handle 22 can be connected to one of the adjustment rings 21, that is, at least one second handle can be separately provided on each adjustment ring 21; in addition, at least two adjustment rings 21 can also be connected through the second handle 22.

[0077] In addition, a second hole 221 is formed on the second handle 22 to further increase the convenience of operation.

[0078] The beneficial effect of the above optional embodiment is that the provision of the second handle 22 further increases the convenience of connecting the device to the hair dryer.

[0079] Optional, such as Figure 1 、 Figure 2 and Figure 7As shown, at least one annular groove 11 is formed on the outer wall of the fixing ring 1 , and the number of the adjustment rings 21 is the same as the number of the annular grooves 11 . The adjustment rings 21 are rotatably connected in the annular grooves 11 in a one-to-one correspondence.

[0080] The beneficial effect of the above optional embodiment is that the provision of the annular groove 11 ensures the reliability of the rotatable connection between the adjustment ring 21 and the fixing ring 1 .

[0081] Optional, such as Figure 6 、 Figure 8 and Figure 9 As shown, the cross-sectional shape of each limiting block 213 is an arc shape.

[0082] In the above optional embodiment, it should be noted that the limiting block 4 and the inner side wall of the corresponding second adjustment groove 212 are formed integrally in the form of an arc transition.

[0083] The beneficial effects of the above optional embodiments are: by setting the cross-sectional shape of the limit block 213 to be an arc shape, when the device needs to be used to connect the hair dryer, the connecting rod 4 can relatively easily pass through the limit block 213 and abut against the limit block 213 and the inner wall of the second adjustment groove 212. When the hair dryer needs to be disassembled, it is relatively easy to rotate the adjustment ring 21 in the opposite direction, thereby achieving a quick and reliable connection of the hair dryer and making disassembly more convenient.

[0084] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A mine air duct connection device, characterized in that: The invention comprises a fixed ring (1), an adjusting ring (2) and at least one telescopic inner ring (3), wherein the central axis of each telescopic inner ring (3) is colinear with the central axis of the fixed ring (1), the fixed ring (1) is located on the outer periphery of each telescopic inner ring (3), the adjusting ring (2) is rotatably connected to the fixed ring (1), and each telescopic inner ring (3) comprises a plurality of movable blocks (31) and a plurality of connecting rods (4) arranged in a circular array, one end of each connecting rod (4) is connected to one movable block (31), and the other end of each connecting rod (4) passes through the fixed ring (1) and is slidably connected to the adjusting ring (2). When the adjusting ring (2) rotates clockwise relative to the fixed ring (1), the distance between the outer wall of each movable block (31) and the inner wall of the fixed ring (1) gradually shortens, and when the adjusting ring (2) rotates counterclockwise relative to the fixed ring (1), the distance between two adjacent movable blocks (31) gradually shortens.

2. The mine air duct connection device according to claim 1, characterized in that: The adjustment ring (2) comprises at least one adjustment ring (21), and the number of the telescopic inner rings (3) is the same as the number of the adjustment rings (21); A plurality of first adjustment grooves (211) are provided on the inner side wall of each adjustment ring (21), and a plurality of second adjustment grooves (212) are provided on the surface of each adjustment ring (21) in the form of a circular array. The plurality of first adjustment grooves (211) and the plurality of second adjustment grooves (212) are connected to each other in a one-to-one correspondence. The distance between each second adjustment groove (212) and the axis of the corresponding adjustment ring (21) gradually increases from one end of the second adjustment groove (212) to the other end of the second adjustment groove (212). The end of each connecting rod (4) away from the corresponding movable block (31) passes through the first adjustment groove (211) and is slidably connected to the second adjustment groove (212).

3. The mine air duct connection device according to claim 2, characterized in that: It also includes a limiting block (213), and the inner side wall of each second adjustment slot (212) is provided with a limiting block (213).

4. The mine air duct connection device according to claim 2, characterized in that: Each of the connecting rods (4) comprises a connecting cross bar (41) and a connecting slide bar (42), wherein the connecting slide bar (42) is slidably connected to the second adjustment slot (212), one end of the connecting cross bar (41) is connected to the corresponding movable block (31), and the other end of the connecting cross bar (41) passes through the first adjustment slot (211) and is connected to the connecting slide bar (42), and the connecting slide bar (42) and the connecting cross bar (41) are perpendicular to each other.

5. The mine air duct connection device according to claim 1, characterized in that: At least one slot (311) is formed on the outer side wall of each movable block (31).

6. The mine air duct connection device according to any one of claims 1 to 5, characterized in that: It also includes a first handle (13), and the outer side wall of the fixing ring (1) is connected to at least one first handle (13).

7. The mine air duct connection device according to claim 6, characterized in that: A first hole (131) is formed on the first handle (13).

8. The mine air duct connection device according to any one of claims 1 to 5, characterized in that: It also includes a second handle (22), and the outer side wall of the adjustment ring (2) is connected to at least one second handle (22).

9. The mine air duct connection device according to claim 2, characterized in that: At least one annular groove (11) is formed on the outer side wall of the fixing ring (1), the number of the adjusting rings (21) is the same as the number of the annular grooves (11), and the adjusting rings (21) are rotatably connected in the annular grooves (11) in a one-to-one correspondence.

10. The mine air duct connection device according to claim 3, characterized in that: The cross-sectional shape of each of the limiting blocks (213) is an arc shape.

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