A CNC tube expander specifically for condenser heat exchanger tubes

Abstract

This utility model relates to the field of CNC machining technology. It discloses a CNC tube expander specifically for condenser heat exchange tubes, comprising a machining table with a lifting mechanism and an adjusting mechanism. The adjusting mechanism includes an alignment sleeve and a pre-treatment mechanism. An expander head is slidably connected to the alignment sleeve and fixed to a downward expanding mechanism. This utility model, through its adjusting mechanism, can adjust the tube expansion spacing according to specific tube arrangement requirements, improving the versatility of the expander. After spacing adjustment, a locking cylinder presses a locking plate tightly against a friction plate to lock the position of the adjusting frame, preventing the alignment sleeve in the adjusting frame from becoming misaligned during tube expansion and ensuring the expansion effect. Before tube expansion, the pre-treatment mechanism cleans the inner wall of the tube to prevent residual impurities from scratching the inner wall or damaging the expander head.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machining technology, specifically relating to a CNC tube expander for condenser heat exchange tubes. Background Technology

[0002] CNC tube expanders are automated devices used in condenser manufacturing for the precise expansion of heat exchange tubes and tube sheets. Through digital control, they achieve high-precision tube expansion, ensuring a gap-free connection between the heat exchange tubes and tube sheets during later assembly, eliminating the risk of leakage. Simultaneously, mechanical control ensures uniform expansion, avoiding tube wall deformation or cracking caused by traditional manual expansion, effectively improving the processing quality of condenser heat exchange tubes. While existing CNC tube expanders can generally meet daily usage needs, the expansion positions are relatively fixed, making it difficult to adjust the expansion spacing according to specific tube arrangement requirements, thus affecting the machine's versatility. Furthermore, to prevent damage to the inner wall of the tubes before expansion, manual cleaning of the expansion area is required, increasing labor costs. Therefore, designing a dedicated CNC tube expander for condenser heat exchange tubes is essential. Utility Model Content

[0003] The purpose of this utility model is to provide a simple and reasonably designed CNC tube expander for condenser heat exchange tubes in order to solve the above problems.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] A CNC tube expander for condenser heat exchange tubes includes a processing table with a lifting mechanism and an adjusting mechanism. The adjusting mechanism has an alignment sleeve and a pre-treatment mechanism. An expander head is slidably connected to the alignment sleeve and fixed to the lowering expander mechanism.

[0006] As a further optimization of this utility model, the lifting mechanism includes a lifting motor embedded in one side of the processing table, a lifting screw fixedly connected to the output end of the lifting motor, the top end of the lifting screw rotatably connected to an upper support, and a support rod provided on one side of the bottom of the upper support. The support rod is fixed on the processing table, a connecting block is provided on the lifting screw, one side of the connecting block is fixed to the lifting frame, and the lifting frame is slidably connected to the support rod.

[0007] As a further optimization of this utility model, the adjustment mechanism includes an outer support fixed in the lifting frame, a slide rail symmetrically arranged in the outer support, an adjustment block slidably connected on the slide rail, and the adjustment block fixedly sleeved on the alignment sleeve.

[0008] As a further optimization of this utility model, an adjusting frame is fitted onto the alignment sleeve, and a toothed groove on the adjusting frame meshes with a central gear. The central gear is fixedly connected to the output end of a gear motor, and the gear motor is fixedly mounted on a limiting frame. One side of the adjusting frame is slidably connected to the limiting frame. A friction plate is embedded in a groove on the side of the adjusting frame near the limiting frame. Locking cylinders are symmetrically mounted on the limiting frame, and a locking plate is fixedly connected to the output end of the locking cylinder. The locking plate is attached to the friction plate.

[0009] As a further optimization of this utility model, the pretreatment mechanism includes a rotary motor fixedly installed in the alignment sleeve. The output end of the rotary motor is fixedly connected to a telescopic cylinder. The output end of the telescopic cylinder is fixedly connected to a fixed frame. A pushing electric cylinder is fixedly connected in the fixed frame. The pushing electric cylinder is fixedly installed on a first support plate. The output end of the pushing electric cylinder is fixedly connected to a second support plate. A connecting arm is rotatably connected to the second support plate. One end of the connecting arm is hinged to a processing bracket. One end of the processing bracket is rotatably connected to the first support plate, and a cleaning brush is provided at the other end of the processing bracket.

[0010] As a further optimization of this utility model, the downward pressure expansion mechanism includes a first arm fixedly sleeved on the expansion head, a second arm slidably connected to the first arm, the second arm being rotatably connected to the downward pressure column, the downward pressure column being fixedly connected to the output end of the expansion hydraulic cylinder, and the expansion hydraulic cylinder being fixedly mounted on the outer bracket.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model uses a gear motor to drive the central gear to rotate. The central gear and the toothed groove on the adjusting frame can be used to drive the adjusting blocks on both sides to move closer or further apart. After the position is adjusted, the locking cylinder presses the locking plate tightly against the friction plate to lock the position of the adjusting frame. This prevents the alignment sleeve in the adjusting frame from becoming misaligned during the tube expansion process. The tube expansion spacing can be adjusted according to specific tube arrangement requirements, which improves the versatility of the tube expander.

[0013] 2. Before tube expansion, this utility model uses a telescopic cylinder to push the fixing frame to slide outward of the alignment sleeve. After the processing bracket and cleaning brush move out of the alignment sleeve and into the tube to be expanded, the push electric cylinder drives the second support plate to extend. After the second support plate extends, it drives the corresponding six processing brackets to open through six sets of connecting arms, so that the cleaning brush at one end of the processing bracket presses against the inner wall of the tube. Finally, the rotary motor drives the six sets of cleaning brushes to rotate synchronously to clean the inner wall of the tube, avoiding residual impurities from scratching the inner wall of the tube or damaging the tube expansion head. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is an exploded view of part of the structure of this utility model;

[0016] Figure 3 This is a three-dimensional diagram of part of the structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the pre-processing mechanism in this utility model.

[0018] In the diagram: 1. Processing table; 2. Lifting mechanism; 3. Adjusting mechanism; 4. Alignment sleeve; 5. Pre-treatment mechanism; 6. Tube expander head; 7. Downward expansion mechanism; 21. Lifting motor; 22. Lifting screw; 23. Upper support; 24. Support rod; 25. Connecting block; 26. Lifting frame; 30. Locking cylinder; 31. Outer support; 32. Slide rail; 33. Adjusting block; 34. Adjusting frame; 35. Center gear; 36. Gear motor; 37. Limiting frame; 38. Friction plate; 39. Locking piece; 51. Rotary motor; 52. Telescopic cylinder; 53. Fixed frame; 54. Pushing electric cylinder; 55. First support plate; 56. Connecting arm; 57. Second support plate; 58. Processing bracket; 59. Cleaning brush; 71. First support arm; 72. Second support arm; 73. Downward pressure column; 74. Tube expander hydraulic cylinder. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example

[0021] Please see Figures 1-4 A CNC tube expander for condenser heat exchange tubes includes a processing table 1, a lifting mechanism 2 on the processing table 1, and a plate for condenser tube insertion installed on the top of the processing table 1. An adjustment mechanism 3 is installed on the lifting mechanism 2, and an alignment sleeve 4 is installed in the adjustment mechanism 3. The adjustment mechanism 3 can adjust the distance between the alignment sleeves 4. A pre-treatment mechanism 5 is installed in the alignment sleeve 4, and an expander head 6 is slidably connected to the alignment sleeve 4. Before tube expansion, the pre-treatment mechanism 5 cleans the tube expansion part of the tube to prevent residual impurities from scratching the inner wall of the tube or damaging the expander head 6. The expander head 6 is fixed on a pressing expander mechanism 7. During the tube expansion process, the pressing expander mechanism 7 drives the expander head 6 to press down, and the tube expands through the bottom end of the expander head 6, so that one end of the tube expands to fill the hole reserved on the condenser tube insertion plate.

[0022] The lifting mechanism 2 includes a lifting motor 21 embedded in one side of the processing table 1. The lifting motor 21 is selected according to the actual use. The output end of the lifting motor 21 is fixedly connected to a lifting screw 22. The top end of the lifting screw 22 is rotatably connected to the upper support 23 through a bearing. A support rod 24 is provided on the bottom side of the upper support 23 away from the lifting screw 22. The support rod 24 is fixed on the processing table 1. A connecting block 25 is provided on the lifting screw 22. The connecting block 25 is connected to the lifting screw 22 through an internally embedded ball nut. One side of the connecting block 25 is fixed to the lifting frame 26. The lifting frame 26 is slidably connected to the support rod 24. The lifting motor 21 drives the lifting screw 22 to rotate. With the cooperation of the lifting screw 22 and the connecting block 25, the lifting frame 26 is moved up and down along the support rod 24 to adjust the height position of the alignment sleeve 4 and the expansion head 6.

[0023] The adjusting mechanism 3 includes an outer support 31 fixed in the lifting frame 26. A slide rail 32 is symmetrically arranged in the outer support 31. An adjusting block 33 is slidably connected to the slide rail 32, and the adjusting block 33 is fixedly sleeved on the alignment sleeve 4. The slide rail 32 limits the movement of the adjusting block 33, allowing the left and right symmetrical adjusting blocks 33 to move closer or further apart along the slide rail 32. An adjusting frame 34 is sleeved on the alignment sleeve 4. A toothed groove on the adjusting frame 34 meshes with a central gear 35. The central gear 35 is fixedly connected to the output end of a gear motor 36, and the gear motor 36 is fixedly mounted on a limiting frame 37. The gear motor 36 is selected according to the actual application. One side of the adjusting frame 34 slides... During the rotation of the central gear 35 driven by the gear motor 36 connected to the limit frame 37, the adjustment blocks 33 on both sides can be moved closer or further apart by the cooperation between the central gear 35 and the toothed groove on the adjustment frame 34. A friction plate 38 is embedded in the groove on the side of the adjustment frame 34 near the limit frame 37. A locking cylinder 30 is symmetrically installed on the limit frame 37. A locking piece 39 is fixedly connected to the output end of the locking cylinder 30. The locking piece 39 is attached to the friction plate 38. During the tube expansion, the locking cylinder 30 presses the locking piece 39 tightly onto the friction plate 38 to lock the position of the adjustment frame 34 and prevent the alignment sleeve 4 in the adjustment frame 34 from being misaligned during the tube expansion process.

[0024] The pretreatment mechanism 5 includes a rotary motor 51 fixedly installed in the alignment sleeve 4. The rotary motor 51 is selected according to the actual use. A telescopic cylinder 52 is fixedly connected to the output end of the rotary motor 51. The telescopic cylinder 52 is selected according to the actual use. A fixing frame 53 is fixedly connected to the output end of the telescopic cylinder 52. The fixing frame 53 is slidably connected to the inner wall of the alignment sleeve 4 through a sliding frame connected by bearings, which improves the stability of the structure. A pushing electric cylinder 54 is fixedly connected to the fixing frame 53. The pushing electric cylinder 54 is selected according to the actual use. The pushing electric cylinder 54 is fixedly installed on the first support plate 55. The output end of the pushing electric cylinder 54 is fixedly connected to the second support plate 57. A connecting arm 56 is rotatably connected to the second support plate 57. One end of the connecting arm 56 is hinged. The first support plate 57 is connected to the second support plate 58. One end of the second support plate 58 is rotatably connected to the first support plate 55, and the other end of the second support plate 58 is equipped with a cleaning brush 59. The first support plate 55 and the second support plate 57 are both hexagonal column structures. The telescopic cylinder 52 can push the fixing frame 53 to slide out of the alignment sleeve 4. After the second support plate 58 and the cleaning brush 59 move out of the alignment sleeve 4 and extend into the pipe to be expanded, the push cylinder 54 drives the second support plate 57 to extend. After the second support plate 57 extends, it drives the corresponding six sets of the second support plate 58 to open through the six sets of connecting arms 56, so that the cleaning brush 59 at one end of the second support plate 58 presses against the inner wall of the pipe. Finally, the rotary motor 51 drives the six sets of cleaning brushes 59 to rotate synchronously to clean the inner wall of the pipe and avoid residual impurities from scratching the inner wall of the pipe or damaging the expansion head 6.

[0025] The downward expansion mechanism 7 includes a first arm 71 fixedly sleeved on the expansion head 6, a second arm 72 slidably connected to the first arm 71, and the second arm 72 rotatably connected to the downward pressure column 73. When the adjusting mechanism 3 adjusts the position of the two alignment sleeves 4, the expansion head 6 drives the first arm 71 to slide on the second arm 72, while the second arm 72 rotates around the downward pressure column 73 to avoid interference between the expansion head 6 and the position adjustment of the alignment sleeves 4. The downward pressure column 73 is fixedly connected to the output end of the expansion hydraulic cylinder 74, and the expansion hydraulic cylinder 74 is fixedly mounted on the outer bracket 31. During the expansion process, the output end of the expansion hydraulic cylinder 74 drives the downward pressure column 73 to move downward, and then drives the expansion head 6 to move downward synchronously through the second arm 72 and the first arm 71, pressing the expansion head 6 into one end of the tube fitting. The tube is expanded through the bottom end of the expansion head 6, so that one end of the tube fitting expands and fills the hole reserved on the condenser tube plate, completing the entire expansion process.

[0026] It should be noted that, when using this CNC tube expander for condenser heat exchange tubes, the tube to be expanded is first fixed inside the processing table 1, and then the plate for inserting condenser tubes is fixed on the processing table 1 so that the tube is fitted into the center of the pre-drilled hole in the plate. Then, the gear motor 36 drives the central gear 35 to rotate. The engagement of the central gear 35 with the toothed groove on the adjusting frame 34 can drive the adjusting blocks 33 on both sides to move closer or further apart, so that the left and right alignment sleeves 4 are vertically distributed and suspended above the tube to be expanded. After the position adjustment is completed, the locking cylinder 30 presses the locking plate 39 tightly onto the friction plate 38 to lock the position of the adjusting frame 34, preventing the alignment sleeve 4 in the adjusting frame 34 from becoming misaligned during the tube expansion process. Then, the lifting motor 21 drives the lifting screw 22 to rotate, and the lifting screw 22, in cooperation with the connecting block 25, drives the lifting frame 26 to move up and down along the support rod 24 to adjust the height of the alignment sleeve 4 and the tube expansion head 6. After the alignment sleeve 4 approaches the tube, the telescopic cylinder 52 pushes the fixing frame 53 toward the alignment sleeve 4. After the external sliding of the treatment bracket 58 and cleaning brush 59 is removed from the alignment sleeve 4 and inserted into the pipe to be expanded, the push cylinder 54 drives the second support plate 57 to extend. After the second support plate 57 extends, it drives the corresponding six sets of treatment brackets 58 to open through the six sets of connecting arms 56, so that the cleaning brush 59 at one end of the treatment bracket 58 presses against the inner wall of the pipe. Finally, the rotary motor 51 drives the six sets of cleaning brushes 59 to rotate synchronously to clean the inner wall of the pipe, so as to avoid residual impurities scratching the inner wall of the pipe or damaging the expansion head 6. After cleaning is completed, the rotary motor... 51 stops rotating, and the pusher cylinder 54 drives the second support plate 57 to return to its position, causing the cleaning brush 59 to detach from the inner wall of the pipe fitting. Then, the telescopic cylinder 52 drives the fixing frame 53 to slide into the alignment sleeve 4. Next, the output end of the expansion cylinder 74 drives the lower pressure column 73 to move down, and then drives the expansion head 6 to move down synchronously through the second support arm 72 and the first support arm 71, pressing the expansion head 6 into one end of the pipe fitting. The expansion head 6 expands through the bottom end of the expansion head 6, causing one end of the pipe fitting to expand and fill the pre-reserved hole on the condenser tube plate, completing the entire expansion process.

[0027] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A CNC tube expander specifically for condenser heat exchange tubes, comprising a processing table (1), characterized in that: The processing table (1) is provided with a lifting mechanism (2), the lifting mechanism (2) is equipped with an adjustment mechanism (3), the adjustment mechanism (3) is provided with an alignment sleeve (4), and the alignment sleeve (4) is provided with a pre-processing mechanism (5). The alignment sleeve (4) is slidably connected with an expansion head (6), and the expansion head (6) is fixed on the downward expansion mechanism (7).

2. The CNC tube expander for condenser heat exchange tubes according to claim 1, characterized in that: The lifting mechanism (2) includes a lifting motor (21) embedded in one side of the processing table (1). The output end of the lifting motor (21) is fixedly connected to a lifting screw (22). The top end of the lifting screw (22) is rotatably connected to an upper support (23). A support rod (24) is provided on one side of the bottom of the upper support (23). The support rod (24) is fixed on the processing table (1). A connecting block (25) is provided on the lifting screw (22). One side of the connecting block (25) is fixed on a lifting frame (26). The lifting frame (26) is slidably connected to the support rod (24).

3. A CNC tube expander for condenser heat exchange tubes according to claim 2, characterized in that: The adjustment mechanism (3) includes an outer support (31) fixed in the lifting frame (26), and slide rails (32) are symmetrically arranged in the outer support (31). An adjustment block (33) is slidably connected on the slide rail (32), and the adjustment block (33) is fixedly sleeved on the alignment sleeve (4).

4. A CNC tube expander for condenser heat exchange tubes according to claim 3, characterized in that: An adjusting frame (34) is fitted onto the alignment sleeve (4). The toothed groove on the adjusting frame (34) meshes with the central gear (35). The central gear (35) is fixedly connected to the output end of the gear motor (36), and the gear motor (36) is fixedly mounted on the limiting frame (37). One side of the adjusting frame (34) is slidably connected to the limiting frame (37). A friction plate (38) is embedded in a groove on the side of the adjusting frame (34) near the limiting frame (37). A locking cylinder (30) is symmetrically mounted on the limiting frame (37). A locking piece (39) is fixedly connected to the output end of the locking cylinder (30), and the locking piece (39) is attached to the friction plate (38).

5. A CNC tube expander for condenser heat exchange tubes according to claim 4, characterized in that: The pretreatment mechanism (5) includes a rotary motor (51) fixedly installed in the alignment sleeve (4). The output end of the rotary motor (51) is fixedly connected to a telescopic cylinder (52). The output end of the telescopic cylinder (52) is fixedly connected to a fixing frame (53). A pushing electric cylinder (54) is fixedly connected in the fixing frame (53). The pushing electric cylinder (54) is fixedly installed on the first support plate (55). The output end of the pushing electric cylinder (54) is fixedly connected to the second support plate (57). A connecting arm (56) is rotatably connected to the second support plate (57). One end of the connecting arm (56) is hinged to the treatment bracket (58). One end of the treatment bracket (58) is rotatably connected to the first support plate (55). A cleaning brush (59) is provided at the other end of the treatment bracket (58).

6. A CNC tube expander for condenser heat exchange tubes according to claim 1, characterized in that: The downward expansion mechanism (7) includes a first arm (71) fixedly sleeved on the expansion head (6), a second arm (72) slidably connected in the first arm (71), the second arm (72) being rotatably connected to the downward column (73), the downward column (73) being fixedly connected to the output end of the expansion hydraulic cylinder (74), and the expansion hydraulic cylinder (74) being fixedly mounted on the outer bracket (31).

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