Tube expansion and clamping mechanism

Abstract

The application discloses a pipe expanding and clamping mechanism, which comprises a fixed frame provided with a plurality of sleeve pipes for abutting metal pipes, one end of the sleeve pipe being provided with a plurality of pipe petals which can be opened or gathered, the plurality of pipe petals being arranged along the circumference of the sleeve pipe and extending along the axial direction of the sleeve pipe, and the plurality of pipe petals jointly forming a channel for accommodating the metal pipe; a movable frame movably arranged on the fixed frame, the movable frame being provided with a clamping pipe corresponding to the outer circumference of the sleeve pipe; and a driving mechanism arranged on the movable frame or the fixed frame and used for driving the movable frame to move relative to the fixed frame, so that the clamping pipe drives the plurality of pipe petals on the sleeve pipe to gather to clamp the metal pipe. The pipe expanding and clamping mechanism with the above structure can not only quickly clamp a plurality of metal pipes, but also can be adjusted according to different pipe diameters of the metal pipes, and is suitable for a wide range of applications.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tube expanding of heat exchangers, and in particular to a tube expanding clamping mechanism. BACKGROUND

[0002] At present, in the production process of heat exchangers, metal tubes often need to be expanded to tightly combine the metal tubes and the fins sleeved thereon. Specifically, the two ends of the metal tube are first fixed, then a ball head expanding rod is inserted into the tube opening of the metal tube to expand the metal tube, and finally the expanding rod is extracted to complete the tube expanding.

[0003] Since the metal tubes of the existing heat exchangers are mostly distributed in multiple rows and columns, and the tube diameters of the metal tubes of each heat exchanger are different, the existing clamping mechanism cannot clamp and fix multiple metal tubes at the same time, and cannot be adjusted according to the different tube diameters of the metal tubes, so the applicability range is low. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a tube expanding clamping mechanism which can not only quickly clamp multiple metal tubes, but also make corresponding adjustments according to different tube diameters of the metal tubes, so the applicability range is wide.

[0005] According to the tube expanding clamping mechanism of the present application, the fixed frame is provided with multiple sleeve pipes for abutting the metal tubes, one end of the sleeve pipe is provided with multiple pipe petals which can be opened or gathered, the multiple pipe petals are arranged along the circumference of the sleeve pipe and extend along the axial direction of the sleeve pipe, and the multiple pipe petals jointly form a channel for accommodating the metal tube. The movable frame is movably arranged on the fixed frame, and the movable frame is provided with a clamping pipe which is correspondingly sleeved on the outer circumference of the sleeve pipe. The driving mechanism is arranged on the movable frame or the fixed frame, and is used for driving the movable frame to move relative to the fixed frame, so that the clamping pipe drives the multiple pipe petals on the sleeve pipe to gather to clamp the metal tube.

[0006] The tube expanding clamping mechanism of the present application has at least the following beneficial effects: in use, multiple metal tubes are first inserted into the corresponding sleeve pipes, so that the multiple pipe petals on each sleeve pipe are forced to open, and then the driving mechanism drives the movable frame to move towards the tube opening side of the sleeve pipe, so that the multiple clamping pipes move along the corresponding sleeve pipes respectively, so that the clamping pipes gradually gather the multiple pipe petals on the corresponding sleeve pipe, thereby achieving the effect of quickly clamping multiple metal tubes. The multiple pipe petals can be opened to different degrees according to the different tube diameters of the metal tubes, so as to form the insertion of the metal tubes with different tube diameters, thereby improving the applicability range of the product.

[0007] In some embodiments of the present application, the sleeve extends along the left-right direction, the fixing frame is provided with a pushing structure, the driving mechanism comprises a linear driving assembly and a moving block in transmission connection with the linear driving assembly, one end of the moving block is connected with the moving frame and can move relative to the moving frame, the other end of the moving block is in active abutment with the pushing structure, and the linear driving assembly is used to drive the moving block to reciprocate along the front-back direction so as to push the moving frame to move along the left-right direction.

[0008] In some embodiments of the present application, the pushing structure is a guide hole, the included angle between the extension direction of the guide hole and the front-back direction is an acute angle, and the moving block is provided with a roller portion which rolls against the hole wall of the guide hole.

[0009] In some embodiments of the present application, the linear driving assembly comprises a motor and a screw rod in transmission connection with the motor, and the moving block is slidably connected with the screw rod through a ball nut.

[0010] In some embodiments of the present application, the moving frame is provided with two proximity switches which are spaced apart along the front-back direction, and the two proximity switches are used to control the motor so as to limit the moving stroke of the moving block.

[0011] In some embodiments of the present application, at least one set of sliding rails and sliding blocks which slide relative to each other are arranged between the moving block and the moving frame, one of the sliding rails and the sliding blocks is arranged on the moving block, and the other is arranged on the moving frame.

[0012] In some embodiments of the present application, the sleeve is provided with a protrusion which protrudes from the tube wall of the sleeve, the fixing frame is sequentially connected with a limiting plate, a rotation-stopping plate and a mounting plate along the axial direction of the sleeve, the limiting plate is provided with a limiting hole which is used to limit the axial disengagement of the protrusion, the rotation-stopping plate is provided with a clamping hole which is used to limit the radial rotation of the protrusion, and when the protrusion passes through the limiting hole and is built in the clamping hole, the limiting plate and the mounting plate are used to form an anti-disengagement surface which prevents the protrusion from axially disengaging from the clamping hole.

[0013] In some embodiments of the present application, the outer peripheral wall of the protrusion is circumferentially distributed with a first plane and a second plane, the hole wall of the clamping hole has a first positioning plane which cooperates with the first plane, and the hole wall of the limiting plate has a second positioning plane which cooperates with the second plane.

[0014] In some embodiments of the present application, the distance from the second positioning plane to the other side wall of the limiting hole opposite to the second positioning plane is smaller than the distance from the first positioning plane to the other side wall of the clamping hole opposite to the first positioning plane.

[0015] In some embodiments of the present application, a moving plate is arranged between the rotation-stopping plate and the mounting plate, and the moving plate is movable along the length direction of the mounting plate, and the moving plate is provided with a necked hole and an expanded hole which are in communication with each other, the necked hole is used to limit the protruding shaft from being separated from the clamping hole, and the expanded hole is used to form a space for the protruding shaft to rotate, and the necked hole and the expanded hole can be respectively opposite to the clamping hole when the moving plate moves.

[0016] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0018] Figure 1 Structure schematic view of an embodiment of the pipe expanding and clamping mechanism of the present application;

[0019] Figure 2 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 1 Partial enlarged view of A in the embodiment;

[0020] Figure 3 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 1 Partial installation schematic view of the fixing frame and the sleeve in the embodiment;

[0021] Figure 4 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 1 Side view of the embodiment;

[0022] Figure 5 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 3 Structure schematic view of the pipe expanding and clamping mechanism of the present application;

[0023] Figure 6 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 5 Partial exploded view of the pipe expanding and clamping mechanism of the present application;

[0024] Figure 7 Structure schematic view of the pipe expanding and clamping mechanism of the present application; Figure 6 Partial structure schematic view of the limiting plate of the pipe expanding and clamping mechanism of the present application;

[0025] Figure 8 Partial structure schematic view of the rotation-stopping plate of the pipe expanding and clamping mechanism of the present application; Figure 6 Partial structure schematic view of the rotation-stopping plate of the pipe expanding and clamping mechanism of the present application;

[0026] Figure 9 Partial structure schematic view of the moving plate of the pipe expanding and clamping mechanism of the present application; Figure 6 Partial structure schematic view of the moving plate of the pipe expanding and clamping mechanism of the present application;

[0027] Figure 10 Structure schematic view of the sleeve of the pipe expanding and clamping mechanism of the present application; Figure 6 Structure schematic view of the sleeve of the pipe expanding and clamping mechanism of the present application;

[0028] Figure 11 is Figure 10 is a local enlarged view of B in FIG.

[0029] In the figure: fixed frame 100, sleeve 110, pipe valve 111, protrusion 112, first plane 1121, second plane 1122, annular convex part 113, guide hole 120, moving frame 200, clamping pipe 210, driving mechanism 300, linear drive assembly 310, motor 311, screw rod 312, moving block 320, roller part 321, slide rail 400, slide block 410, proximity switch 500, limiting plate 600, limiting hole 610, second positioning plane 611, rotation-stopping plate 700, clamping hole 710, first positioning plane 711, mounting plate 800, fixed plate 810, moving plate 900, necked hole 910, flared hole 920. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it is understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described that the first, the second is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Referring to Figures 1 to 4 An expanding pipe clamping mechanism, comprising: a fixed frame 100, a moving frame 200 and a driving mechanism 300. Wherein the fixed frame 100 is provided with a plurality of sleeve pipes 110 for abutting the metal pipe, one end of the sleeve pipe 110 is provided with a plurality of pipe petals 111 which can be opened or gathered, the plurality of pipe petals 111 are arranged along the circumference of the sleeve pipe 110 and extend along the axial direction of the sleeve pipe 110, and the plurality of pipe petals 111 collectively form a channel for accommodating the metal pipe; the moving frame 200 is movably arranged on the fixed frame 100, and the moving frame 200 is provided with a clamping pipe 210 which is correspondingly sleeved on the outer circumference of the sleeve pipe 110; the driving mechanism 300 is arranged on the moving frame 200 or the fixed frame 100, and is used to drive the moving frame 200 to move relative to the fixed frame 100, so that the clamping pipe 210 drives the plurality of pipe petals 111 on the sleeve pipe 110 to gather to clamp the metal pipe.

[0035] The expanding pipe clamping mechanism with the above structure, in use, a plurality of metal pipes are first inserted into the corresponding sleeve pipes 110, so that the plurality of pipe petals 111 on each sleeve pipe 110 are forced to open, and then the driving mechanism 300 drives the moving frame 200 to move towards the pipe opening side of the sleeve pipe 110, so that the plurality of clamping pipes 210 respectively move along the corresponding sleeve pipes 110, thereby gradually gathering the plurality of pipe petals 111 on the corresponding sleeve pipe 110 by the clamping pipe 210, and achieving the effect of quickly clamping a plurality of metal pipes. Wherein the plurality of pipe petals 111 can be opened to different degrees according to different pipe diameters of the metal pipe, so as to form the insertion of the metal pipe with different pipe diameters, thereby improving the application range of the product.

[0036] In some embodiments, the pipe petals 111 can be made of elastic material. When the metal pipe is inserted into the sleeve pipe 110, the plurality of pipe petals 111 are forced to open and elastically deformed, so that the pipe petals 111 can generate elastic force acting on the metal pipe, thereby achieving the effect of pre-clamping the metal pipe. It can be understood that the pipe petals 111 can be formed by a plurality of slits distributed circumferentially on the sleeve pipe 110 and extending axially, and a pipe petal 111 is formed between two adjacent slits, so as to facilitate the rapid processing of the pipe petals 111.

[0037] Referring to Figures 1 to 3In some embodiments of the present application, the sleeve 110 extends along the left-right direction, the fixing frame 100 is provided with a pushing structure, and the driving mechanism 300 comprises a linear driving assembly 310 and a moving block 320 in driving connection with the linear driving assembly 310. One end of the moving block 320 is connected with the moving frame 200 and can move relative to the moving frame 200, and the other end of the moving block 320 is in active abutment with the pushing structure. The linear driving assembly 310 is used to drive the moving block 320 to move back and forth along the front-rear direction, so as to push the moving frame 200 to move along the left-right direction.

[0038] Specifically, when the linear driving assembly 310 drives the moving block 320 to move along the front-rear direction, the pushing structure pushes the moving block 320 to generate displacement moving along the left-right direction, so as to drive the moving frame 200 to move along the left-right direction, so that the clamping pipe 210 moves along the axis of the sleeve 110 to gather the plurality of pipe petals 111, thereby achieving the effect of clamping the metal pipe. In some embodiments, the clamping pipe 210 is an elastic pipe, which is beneficial to avoid the insertion of metal pipes of different diameters due to the fixed diameter of the clamping pipe 210, thereby further improving the application range of the product.

[0039] Referring to Figures 1 to 3 In some embodiments of the present application, the pushing structure is a guide hole 120, and the angle between the extension direction of the guide hole 120 and the front-rear direction is an acute angle. The moving block 320 is provided with a roller part 321 which rolls against the hole wall of the guide hole 120.

[0040] Specifically, the guide hole 120 is arranged at an acute angle, so that the hole wall of the guide hole 120 forms an inclined surface with a displacement along the left-right direction. When the moving block 320 moves along the front-rear direction in the guide hole 120, the inclined surface can push the moving block 320 to generate displacement moving along the left-right direction, so as to drive the moving frame 200 to move along the left-right direction. When the moving block 320 moves to abut against the inclined surface, the roller part 321 can convert the friction generated between the two into rolling friction, which not only reduces the resistance of the moving block 320, but also improves the smoothness of the movement, and reduces the noise generated by the movement of the moving block 320. In addition, since the slope of the inclined surface is fixed, the moving block 320 can generate equal displacement along the left-right direction in unit time, so that the clamping pipe 210 can be fitted on the outer periphery of the sleeve 110 with a stable feeding amount, thereby facilitating the subsequent accurate adjustment of the displacement of the clamping pipe 210 to adapt to the clamping of metal pipes of different diameters. Of course, it can be understood that the pushing mechanism is a wedge-shaped block arranged on the fixing frame 100, which can also push the moving block 320 to generate displacement moving along the left-right direction.

[0041] Referring to Figure 1 , Figure 2 and Figure 4In some embodiments of the present application, the linear drive assembly 310 comprises a motor 311 and a screw rod 312 in transmission connection with the motor 311, and the moving block 320 is slidingly connected to the screw rod 312 through a ball nut.

[0042] Specifically, the screw rod 312 is used for transmission, which is conducive to regulating the displacement and speed of the moving block 320, so as to facilitate the adjustment of the displacement of the clamping pipe 210 to adapt to the clamping of different metal pipes, and the transmission efficiency and precision of the overall mechanism are high, and the movement is stable. In some embodiments, the fixed frame 100 is spaced apart in the up-down direction and has two push structures, the moving frame 200 is provided with the moving block 320 matched with the push structure, and the linear drive assembly 310 drives the two moving blocks 320 to move synchronously, so that the two moving blocks 320 can generate equal displacement along the left-right direction, thereby pushing the moving frame 200 to move in parallel along the left-right direction, which is conducive to improving the cooperation between the clamping pipe 210 and the sleeve pipe 110. Wherein, the linear drive assembly 310 can use one motor 311 to drive two screw rods 312 to rotate through a worm gear mechanism, so that the moving blocks 320 corresponding arranged on the two screw rods 312 can move synchronously.

[0043] Referring to Figure 2 In some embodiments of the present application, the moving frame 200 is provided with two proximity switches 500 spaced apart along the front-rear direction, and the two proximity switches 500 are used to control the motor 311 to limit the movement stroke of the moving block 320.

[0044] Specifically, the moving block 320 is provided with a metal detection piece which can be detected by the proximity switch 500. When the metal detection piece moves into the sensing area of the proximity switch 500, the proximity switch 500 sends an electrical command to the motor 311, so as to control the motor 311 to be closed to stop the rotation of the screw rod 312, and then stop the movement of the moving block 320, so as to facilitate people to limit the movement stroke of the moving block 320 to ensure that the moving block 320 always abuts against the push structure, and improve the compactness of the mechanism movement.

[0045] Referring to Figure 1 and Figure 2 In some embodiments of the present application, at least one set of sliding rails 400 and sliding blocks 410 are arranged between the moving block 320 and the moving frame 200, the sliding rails 400 extend along the front-rear direction, the sliding rails 400 are connected to the moving block 320, and the sliding blocks 410 are arranged on the moving frame 200. Of course, the sliding rails 400 and the sliding blocks 410 can also be mutually exchanged in the installation position.

[0046] Specifically, the cooperation between the slide rail 400 and the slide block 410 can guide and limit the movement of the moving block 320, thereby avoiding the movement of the moving block 320 from affecting the subsequent cooperation. It can be understood that the guide hole 120 and the moving block 320 are provided with at least two groups, and the two moving blocks 320 are distributed on the same slide rail 400 along the front and back directions. When one of the moving blocks 320 is driven to move by the linear driving assembly 310, the other moving block 320 can move synchronously, so that the two sides of the moving frame 200 can produce equal displacement along the left and right directions under the pushing of the two moving blocks 320, thereby avoiding the movement of the moving frame 200 from being offset along the front and back directions to cause the clamping pipe 210 to be unable to clamp multiple metal pipes at the same time, and being beneficial to improve the stability of the movement of the moving frame 200. In some embodiments, the moving frame 200 and the fixed frame 100 are further provided with mutually cooperating guide rails and sliding grooves, the guide rails are arranged along the left and right directions, thereby guiding and limiting the movement of the moving frame 200 along the left and right directions, and further ensuring the subsequent cooperation between the clamping pipe 210 and the sleeve pipe 110.

[0047] Referring to Figures 3 to 6 In some embodiments of the present application, the sleeve pipe 110 is provided with a protrusion 112 protruding from the wall thereof, the fixed frame 100 is sequentially connected with a limiting plate 600, a rotation-stopping plate 700 and a mounting plate 800 along the axial direction of the sleeve pipe 110, the limiting plate 600 is provided with a limiting hole 610 for limiting the axial disengagement of the protrusion 112, the rotation-stopping plate 700 is provided with a clamping hole 710 for limiting the radial rotation of the protrusion 112, and when the protrusion 112 passes through the limiting hole 610 and is built in the clamping hole 710, the limiting plate 600 and the mounting plate 800 are used to form an anti-disengagement surface which prevents the protrusion 112 from being axially disengaged from the clamping hole 710.

[0048] Specifically, the hole walls of the limiting holes 610 and the clamping holes 710 are each provided with a positioning portion cooperating with the protrusion 112, the two positioning portions are staggered with each other and can limit the direction in which the protrusion 112 is arranged. When installing the sleeve 110, first, the protrusion 112 is arranged in the limiting hole 610 at a specified angle according to the positioning portion of the limiting hole 610, then the sleeve 110 is rotated according to the positioning portion of the clamping hole 710, so that the protrusion 112 can be arranged in the clamping hole 710 at a specified angle, finally, the limiting plate 600, the rotation-stopping plate 700 and the mounting plate 800 are sequentially fixed to the fixing frame 100 by bolt members, so that the installation and fixing of the sleeve 110 are completed, which is simple and convenient. The limiting plate 600 and the mounting plate 800 form a anti-disengagement surface capable of abutting against the protrusion 112, so as to limit the protrusion 112 from being axially disengaged from the clamping hole 710, and the clamping hole 710 limits the protrusion 112 from rotating radially, so that the protrusion 112 cannot rotate in the clamping hole 710 and disengage from the limiting hole 610. It can be understood that the mounting plate 800 is provided with a through hole opposite to the clamping hole 710, the through hole can be arranged along the axial direction of the sleeve 110, so as to facilitate the expansion treatment of the metal pipe.

[0049] Referring to Figure 6 , Figure 10 and Figure 11 In some embodiments, the fixing frame 100 is provided with a fixing plate 810 opposite to the mounting plate 800, the sleeve 110 is provided with an annular protruding portion 113 protruding from the pipe wall, the fixing plate 810 is provided with a mounting hole matching the diameter of the annular protruding portion 113, and the axes of the limiting holes 610 and the clamping holes 710 are collinear with the axis of the mounting hole. When the sleeve 110 is installed on the fixing plate 810, the limiting plate 600 and the rotation-stopping plate 700, the cooperation between the annular protruding portion 113 and the mounting hole can achieve the effect of positioning and installing the sleeve 110, which is beneficial to avoid the phenomenon of axial deviation of the sleeve 110 during the installation process and affect the subsequent cooperation.

[0050] Referring to Figures 5 to 11 In some embodiments of the present application, the outer peripheral wall of the protrusion 112 is circumferentially provided with a first plane 1121 and a second plane 1122, the hole wall of the clamping hole 710 is provided with a first positioning plane 711 cooperating with the first plane 1121, and the hole wall of the limiting hole 610 is provided with a second positioning plane 611 cooperating with the second plane 1122.

[0051] Specifically, when installing the sleeve 110, first align the second plane 1122 with the second positioning plane 611, so that the protrusion 112 can be inserted into the limiting plate 600 at a specified angle, and then rotate the sleeve 110 to align the first plane 1121 with the first positioning plane 711, so that the protrusion 112 can be inserted into the clamping hole 710 at a specified angle. Wherein, since the first positioning plane 711 and the second positioning plane 611 are staggered with each other, and the first positioning plane 711 cooperates with the first plane 1121, the protrusion 112 cannot be rotated to a position where the second plane 1122 is aligned with the second positioning plane 611 in the clamping hole 710, so that the protrusion 112 cannot be moved out from one side of the limiting hole 610, ensuring that the protrusion 112 is fixed in the clamping hole 710 to complete the fixed installation of the sleeve 110. Of course, it can be understood that the protrusion 112 can also be provided with only one plane, which corresponds to the first positioning plane 711 and the second positioning plane 611 respectively, and can also limit the direction of the protrusion 112 inserted into the clamping hole 710 and the limiting hole 610.

[0052] In some embodiments of the present application, in order to enable the limiting plate 600 to form a anti-extraction surface that limits the protrusion 112 from being axially separated from the clamping hole 710, the distance from the second positioning plane 611 to the other side wall of the limiting hole 610 opposite to the second positioning plane 611 is less than the distance from the first positioning plane 711 to the other side wall of the clamping hole 710 opposite to the first positioning plane 711.

[0053] Referring to Figures 4 to 6 and Figure 9 In some embodiments of the present application, the moving plate 900 is clamped between the rotation limiting plate 700 and the mounting plate 800, and the moving plate 900 can reciprocate along the length direction of the mounting plate 800. The moving plate 900 is provided with a necked hole 910 and an expanded hole 920 which are in communication with each other. The necked hole 910 is used to limit the protrusion 112 from being axially separated from the clamping hole 710, and the expanded hole 920 is used to form a space for the protrusion 112 to rotate. When the moving plate 900 moves, the necked hole 910 and the expanded hole 920 can be opposite to the clamping hole 710 respectively.

[0054] Specifically, when the sleeve 110 is placed in the clamping hole 710, the moving plate 900 is moved to align the tapered hole 910 with the clamping hole 710, so that the protrusion 112 cannot pass through the tapered hole 910 and is stopped in the clamping hole 710. When the moving plate 900 is moved to align the flared hole 920 with the clamping hole 710, the protrusion 112 is pushed into the flared hole 920 and the direction of rotation is changed, so that the protrusion 112 can be rotated to a specified angle and removed from the limiting hole 610, completing the disassembly of the single sleeve 110, so as to facilitate the subsequent replacement of the single sleeve 110. It can be understood that the moving plate 900 is connected to the extension rod of the air cylinder or hydraulic cylinder, so that the moving plate 900 can form linear reciprocating movement relative to the moving frame 200, and then the tapered hole 910 and the flared hole 920 can be switched back and forth according to the actual situation. In some embodiments, the diameter of the tapered hole 910 is slightly larger than or equal to the diameter of the sleeve 110, so that the end of the sleeve 110 close to the protrusion 112 can pass through the tapered hole 910, and then the protrusion 112 is limited from being axially separated from the clamping hole 710 by the moving plate 900.

[0055] Referring to Figures 6 to 11 In some embodiments, the clamping hole 710 is a square hole, and the limiting hole 610 is a strip-shaped hole. The width and length of the square hole are greater than the width of the strip-shaped hole. Two first planes 1121 are arranged in parallel, and the distance between the two first planes 1121 is equal to the length and width of the square hole. Two second planes 1122 are arranged in parallel, and the distance between the two second planes 1122 is equal to the width of the strip-shaped hole. The first planes 1121 and the second planes 1122 are perpendicular to each other. When it is necessary to install the sleeve 110, first align the flared hole 920 with the square hole, then align the second planes 1122 with the width direction of the strip-shaped hole, then pass the protrusion 112 through the strip-shaped hole and the square hole in sequence and place it in the flared hole 920, and then rotate the protrusion 112 by 90 degrees to align the first planes 1121 with the width direction of the square hole, so as to insert the protrusion 112 into the square hole. Finally, move the moving plate 900 to a position where the tapered hole 910 aligns with the square hole, so that the protrusion 112 can be clamped in the clamping hole 710 to complete the effect of fixing and installing the sleeve 110. When it is necessary to disassemble the sleeve 110 subsequently, it is not necessary to disassemble the limiting plate 600 and the clamping plate. Only by aligning the flared hole 920 with the square hole, the sleeve can be removed by subsequently rotating the angle of the sleeve 110, which simplifies the steps of installing and disassembling the sleeve 110 and is simple and convenient to operate. In addition, the disassembly of the single sleeve 110 enables people to adjust the layout of the sleeve 110 according to different styles of heat exchangers, further improving the application range of the product.

[0056] Each technical feature of the above-described embodiments can be combined with any other technical feature, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the specification includes all possible combinations.

[0057] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which are defined by the following claims and their equivalents.

Claims

1. A tube expansion clamping mechanism, characterized in that, include: The fixing frame (100) is provided with multiple sleeves (110) for connecting metal tubes. One end of the sleeve (110) is provided with multiple tube flaps (111) that can be opened or closed. The multiple tube flaps (111) are arranged circumferentially along the sleeve (110) and extend axially along the sleeve (110). The multiple tube flaps (111) together form a channel for accommodating the insertion of the metal tube. A movable frame (200) is movably disposed on the fixed frame (100), and the movable frame (200) is provided with a clamping tube (210) corresponding to the outer periphery of the sleeve (110). A drive mechanism (300) is provided on the movable frame (200) or the fixed frame (100) for driving the movable frame (200) to move relative to the fixed frame (100) so that the clamping tube (210) drives the multiple tube flaps (111) on the sleeve (110) to converge to clamp the metal tube; The sleeve (110) is provided with a protrusion (112) protruding from its wall. The fixing bracket (100) is connected in sequence along the axial direction of the sleeve (110) to a limiting plate (600), an anti-rotation plate (700) and a mounting plate (800). The limiting plate (600) is provided with a limiting hole (610) for limiting the axial disengagement of the protrusion (112). The anti-rotation plate (700) is provided with a snap-fit ​​hole (710) for limiting the radial rotation of the protrusion (112). When the protrusion (112) passes through the limiting hole (610) and is placed inside the snap-fit ​​hole (710), the limiting plate (600) and the mounting plate (800) are used to form an anti-disengagement surface that prevents the protrusion (112) from axially disengaging from the snap-fit ​​hole (710).

2. The tube expansion clamping mechanism according to claim 1, characterized in that: The sleeve (110) extends in the left-right direction. The fixed frame (100) is provided with a pushing structure. The driving mechanism (300) includes a linear drive assembly (310) and a moving block (320) that is connected to the linear drive assembly (310). One end of the moving block (320) is connected to the moving frame (200) and can move relative to the moving frame (200). The other end of the moving block (320) is in movable contact with the pushing structure. The linear drive assembly (310) is used to drive the moving block (320) to reciprocate in the front-back direction to push the moving frame (200) to move in the left-right direction.

3. The tube expansion clamping mechanism according to claim 2, characterized in that: The pushing structure is a guide hole (120), and the angle between the extension direction of the guide hole (120) and the front-back direction is an acute angle. The moving block (320) is provided with a roller part (321) that rolls against the hole wall of the guide hole (120).

4. The tube expansion clamping mechanism according to claim 2, characterized in that: The linear drive assembly (310) includes a motor (311) and a lead screw (312) that is driven by the motor (311), and the moving block (320) is slidably connected to the lead screw (312) by a ball nut.

5. The tube expansion clamping mechanism according to claim 4, characterized in that: The movable frame (200) is provided with two proximity switches (500) spaced apart in the front-rear direction. The two proximity switches (500) are used to control the motor (311) to limit the travel of the movable block (320).

6. The tube expansion clamping mechanism according to claim 2, characterized in that: At least one set of sliding rails (400) and sliders (410) are provided between the movable block (320) and the movable frame (200) to cooperate and slide together. The sliding rails (400) extend in the front-back direction. One of the sliding rails (400) and the sliders (410) is provided on the movable block (320) and the other is provided on the movable frame (200).

7. The tube expansion clamping mechanism according to claim 1, characterized in that: The outer peripheral wall of the protrusion (112) has a first plane (1121) and a second plane (1122) distributed circumferentially. The hole wall of the snap-fit ​​hole (710) has a first positioning plane (711) that cooperates with the first plane (1121). The hole wall of the limiting plate (600) has a second positioning plane (611) that cooperates with the second plane (1122).

8. The tube expansion clamping mechanism according to claim 7, characterized in that: The distance from the second positioning plane (611) to the other side wall of the limiting hole (610) opposite to the second positioning plane (611) is less than the distance from the first positioning plane (711) to the other side wall of the snap-fit ​​hole (710) opposite to the first positioning plane (711).

9. The tube expansion clamping mechanism according to claim 1, characterized in that: A movable plate (900) is sandwiched between the anti-rotation plate (700) and the mounting plate (800). The movable plate (900) can reciprocate along the length of the mounting plate (800). The movable plate (900) is provided with a constricted hole (910) and a flared hole (920) that are interconnected. The constricted hole (910) is used to restrict the protrusion (112) from axially disengaging from the snap-fit ​​hole (710). The flared hole (920) is used to form a space for the protrusion (112) to rotate. When the movable plate (900) moves, the constricted hole (910) and the flared hole (920) can be opposite to the snap-fit ​​hole (710) respectively.

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