A finned heat exchanger tube expander

Abstract

The present invention provides a finned heat exchanger tube expanding machine, which relates to the field of machining, and includes a fixed base, a rotating base, a positioning table and a workbench. One end of the fixed base is connected with a limiting wall, and a vertical slideway is arranged on the limiting wall. The cross section of the vertical slideway is "T"-shaped. A positioning slider is connected in the vertical slideway, and the positioning slider can move up and down in the vertical slideway. The lower end of the positioning slider is connected with the workbench. Through the positioning slider, the workbench can only move up and down along the vertical slideway. And a hydraulic telescopic cylinder is arranged below the workbench. Compared with the prior art, the beneficial effect of the present invention is that through the cooperation of the rotating base and the hydraulic telescopic cylinder, the rotation of the heat exchanger is realized, so that the same hydraulic tube expanding structure can perform two tube expanding operations on the heat exchanger, and with the cooperation of the protective sleeve, the situation of the base tube deformation or damage occurring during the tube expanding operation can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the field of machining, and particularly to a tube expanding machine for a finned heat exchanger. Background Art

[0002] The material of the base tube is generally an aluminum tube or a copper tube. Fins are rolled on the surface of the copper tube, and the heat exchange surface area of the copper tube is increased through the fins, so as to improve the heat exchange efficiency of the cooler. Based on this, it is required that the fins on the copper tube of the cooler must be tightly combined on the tube wall of the copper tube without loosening. If loosening occurs, there will inevitably be gaps for air circulation, which will in turn affect the heat exchange efficiency. Therefore, the tight combination of the copper tube and the fins of the cooler is achieved by expanding the diameter of the copper tube with a tube expanding machine. A tube expanding machine for a finned heat exchanger with a publication number of CN107999646A is retrieved, which includes a frame, a mold, a sheet arranging device, and a pushing and expanding device; a guide rail is provided on the frame; the mold is arranged parallel to it; the sheet arranging device includes: a traveling mechanism and a fin stacking disc; the traveling mechanism is installed on the guide rail and is located above the mold; the fin stacking disc is arranged on the traveling mechanism; the pushing and expanding device includes: a base tube fixing device and a pushing core driving device; the base tube fixing device is arranged at both ends of the mold, and the pushing core driving device includes a driving motor, a driving chain, a core fixing device, a driving sprocket, and a core; the driving sprockets are respectively arranged in the middle of the frame and at one end away from the mold; the driving motor is connected to the driving sprocket through a speed reducing mechanism; the driving chain is installed on the driving sprocket; the core fixing device includes: a core fixing frame and a core fixing clamp; the core fixing frame is in a gate shape, installed on the guide rail, and fixedly connected to the driving chain; the core fixing clamp is fixed on the core fixing frame.

[0003] However, in the above technology, when performing tube expanding operation on the heat exchanger through the fin stacking disc and the pushing and expanding device, and fixing it by clamping the heat exchanger, it is easy to damage the fins, and the equipment is cumbersome, with low efficiency and high production cost. Summary of the Invention

[0004] The problem to be solved by the present invention is to realize the tube expanding operation on the finned heat exchanger through a simpler structure, and can better prevent the fins of the finned heat exchanger from being damaged due to clamping during the tube expanding operation.

[0005] To achieve the above object, the technical solution adopted by the present invention is a finned heat exchanger tube expanding machine, which includes a fixed base, a rotating base, a positioning table and a workbench. One end of the fixed base is connected with a limiting wall, and a vertical slideway is arranged on the limiting wall. The cross-section of the vertical slideway is "T"-shaped. A positioning slider is connected in the vertical slideway. The positioning slider can move up and down in the vertical slideway. The lower end of the positioning slider is connected with the workbench. Through the positioning slider, the workbench can only move up and down along the vertical slideway. And a hydraulic telescopic cylinder is arranged below the workbench. The hydraulic telescopic cylinder is arranged in the fixed base. The hydraulic telescopic cylinder can drive the workbench to rise or fall. The rotating base and the workbench are both connected with the fixed base. The rotating base is arranged at one end of the fixed base away from the limiting wall. A hydraulic motor is arranged in the rotating base. When the hydraulic motor rotates, it can drive the positioning table to rotate. The rotation angle of the rotating base each time is 180°. And a hydraulic tube expanding structure is arranged on the workbench. Through the hydraulic tube expanding structure, tube expanding operation can be carried out on the finned heat exchanger.

[0006] Preferably, an internal space is arranged inside the positioning table. One end of the positioning table is provided with an insertion port, and the insertion port is communicated with the internal space. And an auxiliary plate is inserted in the insertion port. The auxiliary plate can be pulled out or inserted into the internal space of the positioning table through the insertion port of the positioning table.

[0007] Preferably, limiting slideways are arranged on the side walls on both sides of the positioning table. A power structure and a lifting rod are arranged in the limiting slideways. Strip-shaped teeth are arranged on the lifting rod. Through the connection between the strip-shaped teeth and the power structure, the power structure can drive the lifting rod to move. And a supporting plate is connected to the lifting rod.

[0008] Preferably, the power structure includes a servo motor, a driving gear, driven gears and a transmission chain. Among them, the servo motor is connected with the driving gear. There are at least two driven gears. And the driving gear and the driven gears are both meshed and connected with the transmission chain.

[0009] Preferably, a limiting arm is arranged on the positioning slider. The limiting arm is parallel to the positioning table. A pushing table is arranged on the limiting arm. The pushing table can move along the length direction of the limiting arm. And a first lead screw motor is arranged on the workbench. The slider of the first lead screw motor is connected with the pushing table. So that the first lead screw motor can drive the pushing table to move.

[0010] Preferably, a transverse slideway is arranged on the pushing table. A second lead screw motor is arranged in the transverse slideway. A plurality of sliders are arranged on the second lead screw motor. Each slider is provided with an electromagnetic clutch. Through the electromagnetic clutch, the combination and separation of the slider and the second lead screw motor are controlled. Thus, the movement of each slider can be controlled separately. A hydraulic tube expanding structure is connected to each slider. The slider can drive the hydraulic tube expanding structure to move along the transverse slideway. And the pushing table can drive the hydraulic tube expanding structure to move along the length direction of the limiting arm.

[0011] Preferably, a telescopic cylinder is further provided at the end of the limiting arm. A protective plate is connected to the telescopic cylinder. A tube expanding slideway and a protective sleeve slideway are arranged on the protective plate. The tube expanding head of the hydraulic tube expanding structure can be inserted into the tube expanding slideway and can move within the tube expanding slideway.

[0012] Preferably, a protective sleeve is arranged in the protective sleeve slideway. The protective sleeve is of a barrel-shaped structure and is arranged in the protective sleeve slideway. The protective sleeve can move along the protective sleeve slideway. After the tube expanding head penetrates through the center position of the bottom wall of the protective sleeve, it enters the protective sleeve. Before performing the tube expanding operation on the fin heat exchanger, the telescopic cylinder drives the protective plate to advance, so that the protective sleeve is sleeved on the tube body of the fin heat exchanger. If the tube plate of the fin heat exchanger is not attached to the side wall of the positioning table, after the protective sleeve is sleeved on the tube body, the protective plate pushes the heat exchanger to move on the positioning table until the tube plate of the heat exchanger is attached to the side wall of the positioning table.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation of the rotating base and the hydraulic telescopic cylinder, the rotation of the heat exchanger is realized, so that the same hydraulic tube expanding structure performs two tube expanding operations on the heat exchanger, and the cooperation with the protective sleeve can effectively prevent the occurrence of the deformation or damage of the base tube during the tube expanding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 is a schematic diagram of the overall structure during the use of the present invention;

[0016] Figure 3 is a schematic diagram of the supporting plate structure of the present invention;

[0017] Figure 4 is a schematic diagram of the overall top view structure of the present invention;

[0018] Figure 5 is a schematic diagram of the overall side view structure of the present invention;

[0019] Figure 6 is a schematic diagram of the internal structure of the positioning table of the present invention;

[0020] Figure 7 is a schematic diagram of the driven gear structure of the present invention;

[0021] Figure 8 is a schematic diagram of the telescopic cylinder during the use of the present invention;

[0022] Figure 9 is a schematic diagram of the side view structure during the use of the present invention;

[0023] Among them, 1 - fixed base, 2 - rotating base, 3 - positioning table, 4 - workbench, 5 - limiting wall, 6 - auxiliary plate, 7 - limiting slideway, 8 - lifting rod, 9 - servo motor, 10 - driving gear, 11 - driven gear, 12 - transmission chain, 13 - supporting plate, 14 - vertical slideway, 15 - positioning slider, 16 - hydraulic telescopic cylinder, 17 - limiting arm, 18 - pushing table, 19 - horizontal slideway, 20 - telescopic cylinder, 21 - protective plate, 22 - expansion tube slideway, 23 - protective sleeve slideway, 24 - protective sleeve. Specific implementation manner

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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; it can be an electrical connection; it can be a hydraulic oil circuit 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 application can be understood according to specific situations.

[0027] Refer to Figures 1 to 9As shown in the figure, a fin heat exchanger tube expanding machine includes a fixed base 1, a rotating base 2, a positioning table 3 and a workbench 4. One end of the fixed base 1 is connected with a limiting wall 5. The fixed base 1 and the limiting wall 5 are in a vertical state. The cross-section of the fixed base 1 and the limiting wall 5 is "L" shaped. And both the rotating base 2 and the workbench 4 are connected with the fixed base 1. The rotating base 2 is arranged at one end of the fixed base 1 away from the limiting wall 5, and the rotating angle of the rotating base 2 each time is 180°. The positioning table 3 is arranged on the rotating base 2. A hydraulic motor is arranged inside the rotating base 2. The output shaft of the hydraulic motor is connected with the positioning table 3, so that the hydraulic motor can drive the positioning table 3 to rotate. And an internal space is arranged inside the positioning table 3. One end of the positioning table 3 is provided with an insertion port, and the insertion port is communicated with the internal space. And an auxiliary plate 6 is inserted into the insertion port. The cross-section of the auxiliary plate 6 is "L" shaped. The auxiliary plate 6 can be drawn out or inserted into the internal space of the positioning table 3 through the insertion port of the positioning table 3. And limiting sliding grooves 7 are arranged on the side walls on both sides of the positioning table 3. Lifting rods 8 are arranged in the limiting sliding grooves 7. Strip-shaped teeth are arranged on the lifting rods 8. And a supporting plate 13 is connected to the lifting rods 8. The lifting rods 8 can move up and down in the limiting sliding grooves 7, so as to drive the supporting plate 13 to move up and down;

[0028] Wherein, a power structure is arranged in the limiting sliding grooves 7. The power structure is composed of a servo motor 9, a driving gear 10, driven gears 11 and a transmission chain 12. Among them, the servo motor 9 is connected with the driving gear 10. There are at least two driven gears 11. And both the driving gear 10 and the driven gears 11 are meshed and connected with the transmission chain 12. The driving gear 10 is arranged at the starting end of the transmission chain 12. The two driven gears 11 are arranged at the middle end and the end of the transmission chain 12. When the servo motor 9 is started, through the cooperation of the driving gear 10 and the transmission chain 12, the driven gears 11 can be controlled to rotate accordingly. And both the driving gear 10 and the driven gears 11 are meshed with the strip-shaped teeth on the lifting rods 8. When the driven gears 11 and the driving gear 10 rotate, the lifting rods 8 can move up and down in the limiting sliding grooves 7, so as to drive the supporting plate 13 to rise or fall. The two ends of the heat exchanger are placed on the supporting plate 13, so that the supporting plate 13 can drive the heat exchanger to rise or fall. And the transmission chain 12 is connected with the auxiliary plate 6. When the driving gear 10 rotates to control the transmission chain 12 to move accordingly, the auxiliary plate 6 will move along with the transmission chain 12, so that the auxiliary plate 6 is drawn out or inserted into the internal space of the positioning table 3. When the power structure controls the lifting rods 8 to rise, the transmission chain 12 will drive the auxiliary plate 6 to be drawn out of the internal space of the positioning table 3. And when the power structure controls the lifting rods 8 to fall, the transmission chain 12 will drive the auxiliary plate 6 to be inserted into the internal space of the positioning table 3. Thus, the auxiliary plate 6 can push and calibrate and position the heat exchanger on the positioning table 3, ensuring that the position and orientation of the heat exchanger on the positioning table 3 are correct.

[0029] A vertical slideway 14 is provided on the limit wall 5. The cross-section of the vertical slideway 14 is "T"-shaped. A positioning slider 15 is connected inside the vertical slideway 14. The positioning slider 15 can move up and down inside the vertical slideway 14. The lower end of the positioning slider 15 is connected to the workbench 4. Through the positioning slider 15, the workbench 4 can only move up and down along the vertical slideway 14. And a hydraulic telescopic cylinder 16 is provided below the workbench 4. The hydraulic telescopic cylinder 16 is arranged inside the fixed base 1. The hydraulic telescopic cylinder 16 can drive the workbench 4 to rise or fall. The movement track of the workbench 4 is limited by the cooperation of the positioning slider 15 and the vertical slideway 14 to prevent the workbench 4 from shifting. When the hydraulic telescopic cylinder 16 drives the workbench 4 to descend to the lowest point, the horizontal height where various components such as the positioning slider 15 on the workbench 4 are located is lower than the horizontal height where the positioning table 3 is located. When the rotating base 2 drives the positioning table 3 to rotate, it is avoided that the positioning table 3 affects the workbench 4.

[0030] And a limit arm 17 is provided on the positioning slider 15. The limit arm 17 is in a parallel state with the positioning table 3. A pushing platform 18 is provided on the limit arm 17. The pushing platform 18 can move along the length direction of the limit arm 17. And a first lead screw motor is provided on the workbench 4. The slider of the first lead screw motor is connected to the pushing platform 18, so that the first lead screw motor can drive the pushing platform 18 to move. And a horizontal slideway 19 is provided on the pushing platform 18. A second lead screw motor is arranged inside the horizontal slideway 19. A plurality of sliders are provided on the second lead screw motor. Each slider is provided with an electromagnetic clutch. The combination and separation of the slider and the second lead screw motor are controlled through the electromagnetic clutch, so as to realize the individual control of the movement of each slider. A hydraulic tube expanding structure is connected to each slider. The slider can drive the hydraulic tube expanding structure to move along the horizontal slideway 19. And the pushing platform 18 can drive the hydraulic tube expanding structure to move along the length direction of the limit arm 17. The hydraulic tube expanding structure is composed of a tube expanding head, a transmission device and other structures. Thus, the hydraulic tube expanding structure can perform tube expanding operation on the heat exchanger.

[0031] A telescopic cylinder 20 is further provided at the end of the limit arm 17. A protective plate 21 is connected to the telescopic cylinder 20. A tube expanding slideway 22 and a protective sleeve slideway 23 are provided on the protective plate 21. The tube expanding slideway 22 is arranged on the side close to the pushing platform 18. The tube expanding head of the hydraulic tube expanding structure can be inserted into the tube expanding slideway 22 and can move within the tube expanding slideway 22. The protective sleeve slideway 23 is arranged on the side away from the pushing platform 18. A protective sleeve 24 is arranged within the protective sleeve slideway 23. The protective sleeve 24 is of a barrel-shaped structure, and the bottom wall of the protective sleeve 24 is slidably connected to the protective sleeve slideway 23. The protective sleeve 24 can move along the protective sleeve slideway 23. After the tube expanding head penetrates through the central position of the bottom wall of the protective sleeve 24, it enters the protective sleeve 24. Moreover, the diameter of the protective sleeve slideway 23 is larger than that of the tube expanding slideway 22, and the diameter of the protective sleeve 24 is also larger than that of the tube expanding head. When the protective plate 21 drives the protective sleeve 24 to advance, the tube expanding head will not advance therewith. When the pushing platform drives the tube expanding head to advance, the protective sleeve 24 will not advance therewith either.

[0032] In use, first raise the supporting plate 13 through the power structure. At this time, the auxiliary plate 6 is withdrawn from the internal space of the positioning table 3, so that the auxiliary plate 6 moves away from the positioning table 3. Then, place the heat exchanger on the supporting plate 13 by a forklift. Then, control the supporting plate 13 to descend through the power structure, so that the heat exchanger falls onto the positioning table 3. At the same time, the auxiliary plate 6 gradually moves closer to the positioning table 3. The auxiliary plate 6 pushes the heat exchanger until the auxiliary plate 6 fits with the positioning table 3, so that the heat exchanger fits with the auxiliary plate 6. Then, control the hydraulic telescopic cylinder 16 to raise the workbench 4 along the vertical slideway 14 on the limiting wall 5. The workbench 4 rises to the height where the heat exchanger is located. Then, control the second lead screw motor and electromagnetic clutch in the horizontal slideway 19 to make the expanding head drive the protective sleeve 24 to move to the position of the corresponding pipe. Subsequently, control the telescopic cylinder 20 to extend, so that the telescopic cylinder 20 drives the protective plate 21 to advance, so that the protective sleeve 24 is sleeved on the pipe body that needs to be expanded. And when the protective plate 21 controls the protective sleeve 24 to advance, if the tube sheet of the heat exchanger is not attached to the side wall of the positioning table 3, then after the protective sleeve 24 is sleeved on the pipe body, the pipe body of the heat exchanger will contact the protective plate 21 in advance, so that the protective plate 21 pushes the heat exchanger to move on the positioning table 3, so that the tube sheet of the heat exchanger fits on the side wall of the positioning table 3, so that the heat exchanger cannot move away from the protective sleeve 24. Then, control the pushing table 18 to advance, so that the pushing table drives the expanding head to advance into the tube body of the heat exchanger to perform the expanding operation. Through the setting of the protective sleeve 24, the diameter of the pipe body can be effectively limited during the expanding operation, avoiding situations such as the pipe body cracking or being damaged. After the expanding operation is completed, control the pushing table 18 and the protective plate 21 to retreat to the initial position, and control the hydraulic telescopic cylinder 16 to reset, so that the workbench 4 descends to the initial position. Then, control the rotating base 2 to rotate and re-perform the above process of the expanding operation, which can more effectively perform the expanding operation on the pipe bodies at both ends of the heat exchanger, and only one set of hydraulic expanding structure is required, reducing costs and having higher efficiency.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fin heat exchanger tube expander, comprising a fixed base, a rotating base, a positioning platform and a workbench, wherein one end of the fixed base is connected to a limiting wall, characterized in that: The limiting wall is provided with a vertical slide, the cross section of the vertical slide is "T"-shaped, a positioning slider is connected in the vertical slide, the positioning slider can move up and down in the vertical slide, the lower end of the positioning slider is connected to the workbench, the workbench can only move up and down along the vertical slide through the positioning slider, and a hydraulic telescopic cylinder is provided under the workbench, the hydraulic telescopic cylinder is provided in the fixed base, the hydraulic telescopic cylinder can drive the workbench to rise or fall, the rotating base and the workbench are both connected to the fixed base, the rotating base is provided at one end of the fixed base away from the limiting wall, a hydraulic motor is provided in the rotating base, the hydraulic motor can drive the positioning platform to rotate when it rotates, the rotating base rotates 180 degrees each time, and a hydraulic expansion tube structure is provided on the workbench, the fin heat exchanger can be expanded by the hydraulic expansion tube structure; The positioning slide block is provided with a limit arm, the limit arm and the positioning platform are in a parallel state, the limit arm is provided with a push platform, the push platform can move along the length direction of the limit arm, and a first screw motor is provided on the workbench, the slider of the first screw motor is connected to the push platform, so that the first screw motor can drive the push platform to move; The push platform is provided with a transverse slideway, a second screw motor is provided in the transverse slideway, a plurality of sliders are provided on the second screw motor, each slider is provided with an electromagnetic clutch, the combination and separation of the slider and the screw motor are controlled by the electromagnetic clutch, so as to realize the individual control of the movement of each slider, a hydraulic expansion tube structure is connected to each slider, the slider can drive the hydraulic expansion tube structure to move along the transverse slideway, and the push platform can drive the hydraulic expansion tube structure to move along the length direction of the limit arm; The end of the limit arm is also provided with a telescopic cylinder, the telescopic cylinder is connected with a protective plate, the protective plate is provided with a tube expansion slideway and a protective sleeve slideway, the tube expansion head of the hydraulic tube expansion structure can be inserted into the tube expansion slideway and can move in the tube expansion slideway; A protective sleeve is arranged in the protective sleeve slideway. The protective sleeve is a barrel-shaped structure and is arranged in the protective sleeve slideway. The protective sleeve can move along the protective sleeve slideway, and the expansion head penetrates the center position of the bottom wall of the protective sleeve and enters the protective sleeve. Before expanding the fin heat exchanger, the telescopic cylinder drives the protective plate to advance so that the protective sleeve is installed on the tube body of the fin heat exchanger. If the tube sheet of the fin heat exchanger is not attached to the side wall of the positioning platform, the protective sleeve is installed behind the tube body, and the protective plate pushes the heat exchanger to move on the positioning platform until the tube sheet of the heat exchanger is attached to the side wall of the positioning platform.

2. The fin heat exchanger tube expander according to claim 1, characterized in that: The positioning platform is provided with an internal space, and one end of the positioning platform is provided with an insertion interface, which is communicated with the internal space, and an auxiliary board is plugged into the insertion interface. The auxiliary board can be pulled out or inserted into the internal space of the positioning platform through the insertion interface of the positioning platform.

3. The fin heat exchanger tube expander according to claim 1, characterized in that: The side walls on both sides of the positioning platform are provided with limited slideways, and a power structure and a lifting rod are arranged in the limited slideways. The lifting rod is provided with bar teeth, which are connected to the power structure through the bar teeth, so that the power structure can drive the lifting rod to move, and the lifting rod is connected to a support plate.

4. The fin heat exchanger tube expander according to claim 3, characterized in that: The power structure comprises a servo motor, a power gear, a driven gear and a transmission chain, wherein the servo motor is connected to the power gear, there are at least two driven gears, and both the power gear and the driven gear are meshed and connected to the transmission chain.

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