Tube expanding device for sealing heat exchange tube and tube plate

Abstract

And the heat exchange tube and the tube plate are sealed by the tube expanding device. Relates to the field of heat exchanger production equipment. Comprising a gun-shaped shell, a mounting rod is arranged at the transverse end of the shell, a hydraulic expansion head is rotationally connected to the end of the mounting rod, the operating platform comprises a platen and a sliding plate, and the platen and the sliding plate are connected through a hydraulic rod; a dovetail groove is formed in the top of the table plate, a bearing block is adaptively arranged in the dovetail groove, an insertion hole is formed in the top of the bearing block, and the vertical end of the shell is inserted into the insertion hole; and a universal wheel is arranged at each of the four corners of the bottom of the sliding plate. According to the device, physical exhaustion of operators can be reduced, the butt joint difficulty can be reduced, and the expansion joint efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to the field of heat exchanger manufacturing equipment, specifically to a tube expansion device for sealing heat exchanger tubes and tube sheets. Background Technology

[0002] Currently, there are three main methods for connecting heat exchanger tubes to tube sheets: expansion joint, welding, and a combination of expansion and welding. In addition, there are adhesive expansion joint and threaded joint methods. Expansion joint is widely used due to its simple structure, ease of tube repair, and convenient replacement.

[0003] In existing related technologies, hydraulic tube expanders are generally used to expand heat exchanger tubes to tube sheets. Specifically, operators manually insert the hydraulic expander into the heat exchanger tube, and after expansion, the expander is pulled out and inserted into the next heat exchanger tube, until all heat exchanger tubes are expanded. Since there are a large number of heat exchanger tubes evenly distributed on the tube sheet, the long-term repetitive operation requires a high level of physical strength from the operator, and precise alignment of the hydraulic expander and heat exchanger tube is required each time, resulting in low overall operation efficiency. Utility Model Content

[0004] To overcome the problems of low overall efficiency and high physical requirements of existing tube expansion operation methods, this application provides a tube expansion device for sealing heat exchange tubes and tube sheets.

[0005] This application adopts the following technical solution: a tube expansion device for sealing heat exchange tubes and tube sheets, including a gun-shaped outer shell, a mounting rod at the horizontal end of the outer shell, a hydraulic expansion head screwed to the end of the mounting rod, and an operating platform, the operating platform including a platform plate and a sliding plate, the platform plate and the sliding plate being connected by a hydraulic rod;

[0006] The top of the platform is provided with a dovetail groove, and a support block is adaptedly provided in the dovetail groove. The top of the support block is provided with an insertion hole, and the vertical end of the outer shell is inserted into the insertion hole.

[0007] Each of the four corners of the bottom of the skateboard is equipped with a swivel wheel.

[0008] Optionally, the fixed part of the hydraulic rod is connected to the bottom of the platform, and the movable part of the hydraulic rod is connected to the top of the slide plate.

[0009] Optionally, the dovetail groove extends along the length of the platform and penetrates the platform, and a limiting block is provided at both ends of the dovetail groove, the limiting block being fixed by bolts.

[0010] Optionally, the bottom of the platform is provided with an upper cover, the top of the slide is provided with a lower cover, the outer wall of the lower cover is fitted with the inner wall of the upper cover, and the hydraulic rod is located inside the upper cover and the lower cover.

[0011] Optionally, the horizontal end of the outer shell is hinged with a sleeve, and a marking pen is inserted into the sleeve. When the hydraulic expansion head is inserted into the heat exchange tube, the nose of the marking pen approaches or abuts the tube sheet.

[0012] A spring is provided between the sleeve and the mounting rod, and the spring is used to support the sleeve.

[0013] Optionally, the sleeve is prismatic, one end of the spring is connected to the bottom of the sleeve, and the other end of the spring is connected to the top of the mounting rod;

[0014] A pressure sensor is provided at the top of the mounting rod, and a pressure block is provided at the bottom of the sleeve. When the sleeve is rotated downward, the pressure block covers the top of the pressure sensor. The data collected by the pressure sensor is transmitted to the controller through a signal line. The controller is used to control the expansion state of the hydraulic expansion head.

[0015] Optionally, both the pressure sensor and the pressure block are located inside the spring.

[0016] Compared with existing technologies, this application uses an operating platform to provide support and position adjustment for the outer shell and hydraulic expansion head, which reduces the physical exertion of operators. Moreover, after expanding several heat exchange tubes in the same row, only the horizontal position of the hydraulic expansion head needs to be adjusted, which reduces the difficulty of connection and effectively improves the expansion efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic perspective view of this application;

[0018] Figure 2 This is a reference diagram showing the explosion state of the operating platform;

[0019] Figure 3 This is a reference diagram showing the state of the platform and the outer casing;

[0020] Figure 4 yes Figure 3 Enlarged structural reference diagram at point A;

[0021] Figure 5 This is a reference diagram showing the usage status of this application;

[0022] In the diagram: 1. Outer shell; 2. Mounting rod; 20. Pressure sensor; 3. Hydraulic expansion head; 4. Operating platform; 41. Table; 411. Dovetail groove; 412. Upper cover; 42. Slide plate; 421. Caster wheel; 422. Lower cover; 43. Hydraulic rod; 44. Bearing block; 440. Insertion hole; 45. Limiting block; 450. Bolt; 5. Sleeve; 51. Marking pen; 52. Spring; 53. Pressure block. Detailed Implementation

[0023] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] As shown in the figure, the tube expansion device for sealing heat exchange tubes and tube sheets includes a gun-shaped outer shell 1. A mounting rod 2 is provided at the horizontal end of the outer shell 1, and a hydraulic expansion head 3 is screwed to the end of the mounting rod 2. It also includes an operating platform 4, which includes a platform 41 and a sliding plate 42. The platform 41 and the sliding plate 42 are connected by a hydraulic rod 43. The fixed part of the hydraulic rod 43 is connected to the bottom of the platform 41, and the movable part of the hydraulic rod 43 is connected to the top of the sliding plate 42. The top of the platform 41 has a dovetail groove 411, within which a support block 44 is fitted. The top of the support block 44 has an insertion hole 440, into which the vertical end of the outer shell 1 is inserted. Furthermore, to improve the fixing effect of the vertical end of the outer shell on the support block 44, a tubular fixing element can be provided on the support block 44. A caster wheel 421 is provided at each of the four corners of the bottom of the sliding plate 42.

[0025] The hydraulic rod 43 extends and retracts, raising and lowering the platform 41, thereby adjusting the height of the hydraulic expansion head 3. Once the hydraulic expansion head 3 is aligned with one of the heat exchange tubes in a row on the tube sheet, the extension / retraction of the hydraulic rod 43 is locked. At this point, simply pushing the sliding plate 42 along the radial direction of the tube sheet allows the hydraulic expansion head 3 to be coaxially aligned with that row of heat exchange tubes. After pushing the sliding plate 42 to align the hydraulic expansion head 3 with a heat exchange tube, pushing the bearing block 44 towards the tube sheet allows the outer casing to guide the hydraulic expansion head 3 into the heat exchange tube. Alternatively, the outer casing can be directly held and pushed, enabling faster insertion of the hydraulic expansion head 3. Once the hydraulic expansion head 3 is inserted, the operator's hands can be removed, significantly saving operator effort. Furthermore, when expanding the next heat exchange tube in the same row, there is no need to adjust the height of the hydraulic expansion head 3, reducing operational difficulty and effectively improving operational efficiency.

[0026] The dovetail groove 411 extends along the length of the platform 41 and penetrates the platform 41. A limiting block 45 is provided at both ends of the dovetail groove 411, and the limiting blocks 45 are fixed by bolts 450. Under the limiting action of the limiting blocks 45, the bearing block 44 cannot slide out of the dovetail groove 411, thus limiting the bearing block 44. Furthermore, the width of the limiting block 45 is less than or equal to the minimum inner diameter of the dovetail groove 411, so that after unscrewing the bolts 450, the limiting block 45 can be quickly removed, facilitating later maintenance.

[0027] The bottom of the platform 41 is provided with an upper cover 412, and the top of the slide plate 42 is provided with a lower cover 422. The outer wall of the lower cover 422 fits against the inner wall of the upper cover 412. The hydraulic rod 43 is located inside the upper cover 412 and the lower cover 422. The upper cover 412 and the lower cover 422 can be pulled together to cover the hydraulic rod 43, preventing external debris from damaging the hydraulic rod 43 and ensuring that the hydraulic rod 43 can be in a reliable working state.

[0028] A sleeve 5 is hinged to the horizontal end of the outer casing 1. A marking pen 51 is inserted into the sleeve 5. When the hydraulic expansion head 3 is inserted into the heat exchange tube, the nose of the marking pen 51 approaches or adheres to the tube sheet. A spring 52 is provided between the sleeve 5 and the mounting rod 2 to support the sleeve 5. After the hydraulic expansion head 3 is inserted, the sleeve 5 can be rotated up and down so that the marking pen 51 can draw a mark on the tube sheet to indicate that the heat exchange tube next to the mark has been expanded and to prevent any heat exchange tubes from being missed. Furthermore, the marking pen 51 can also be held and rotated up and down, and during the rotation, the marking pen 51 can be slightly pulled out or inserted into the sleeve 5 to avoid damaging the marking pen 51 during the marking process.

[0029] The sleeve 5 is prismatic in shape. One end of the spring 52 is connected to the bottom of the sleeve 5, and the other end of the spring 52 is connected to the top of the mounting rod 2. The top of the mounting rod 2 is equipped with a pressure sensor 20, and the bottom of the sleeve 5 is equipped with a pressure block 53. When the sleeve 5 rotates downward, the pressure block 53 presses on the top of the pressure sensor 20. The data collected by the pressure sensor 20 is transmitted to the controller through the signal line. The controller is used to control the expansion state of the hydraulic expansion head 3.

[0030] During the process of rotating the sleeve 5 and marking pen 51 and performing the marking operation, the pressure block 53 will press against the pressure sensor 20, thereby causing the pressure value collected by the pressure sensor 20 to change. When this signal is transmitted to the controller, the controller can control the hydraulic expansion head 3 to start working.

[0031] The pressure sensor 20 and the pressure block 53 are both located inside the spring 52. The spring 52 is designed not only to facilitate the reset of the sleeve 5, but also to protect the pressure block 53 and the pressure sensor 20, ensuring that only the pressure block 53 can press on the pressure sensor 20.

[0032] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A tube expansion device for sealing heat exchange tubes and tube sheets, comprising a gun-shaped outer shell (1), wherein a mounting rod (2) is provided at the transverse end of the outer shell (1), and a hydraulic expansion head (3) is screwed to the end of the mounting rod (2), characterized in that, It also includes an operating platform (4), which includes a platform (41) and a slide (42), and the platform (41) and the slide (42) are connected by a hydraulic rod (43); The top of the platform (41) is provided with a dovetail groove (411), and a support block (44) is adapted to be provided in the dovetail groove (411). The top of the support block (44) is provided with an insertion hole (440), and the vertical end of the outer shell (1) is inserted into the insertion hole (440). Each of the four corners of the bottom of the skateboard (42) is provided with a universal wheel (421).

2. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 1, characterized in that, The fixed part of the hydraulic rod (43) is connected to the bottom of the platform (41), and the movable part of the hydraulic rod (43) is connected to the top of the slide plate (42).

3. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 1, characterized in that, The dovetail groove (411) extends along the length of the platform (41) and penetrates the platform (41). Each end of the dovetail groove (411) is provided with a limiting block (45), and the limiting block (45) is fixed by bolts (450).

4. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 2, characterized in that, The bottom of the platform (41) is provided with an upper cover (412), and the top of the slide plate (42) is provided with a lower cover (422). The outer wall of the lower cover (422) is in contact with the inner wall of the upper cover (412), and the hydraulic rod (43) is located inside the upper cover (412) and the lower cover (422).

5. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 1, characterized in that, The outer shell (1) is hinged to a sleeve (5) at its horizontal end. A marker pen (51) is inserted inside the sleeve (5). When the hydraulic expansion head (3) is inserted into the heat exchange tube, the nose of the marker pen (51) approaches or adheres to the tube sheet. A spring (52) is provided between the sleeve (5) and the mounting rod (2), and the spring (52) is used to support the sleeve (5).

6. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 5, characterized in that, The sleeve (5) is prismatic in shape, one end of the spring (52) is connected to the bottom of the sleeve (5), and the other end of the spring (52) is connected to the top of the mounting rod (2); The top of the mounting rod (2) is provided with a pressure sensor (20), and the bottom of the sleeve (5) is provided with a pressure block (53). When the sleeve (5) rotates downward, the pressure block (53) covers the top of the pressure sensor (20). The data collected by the pressure sensor (20) is transmitted to the controller through a signal line. The controller is used to control the expansion state of the hydraulic expansion head (3).

7. The tube expansion device for sealing heat exchange tubes and tube sheets according to claim 6, characterized in that, The pressure sensor (20) and the pressure block (53) are both located inside the spring (52).

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