A hoisting and expanding machine suitable for heat exchange tubes of heat exchangers

Abstract

The application discloses a kind of suitable for heat exchanger heat exchange pipe's expansion machine, including rack, for containing heat exchange pipe's expansion sleeve, expansion rod inserted into expansion sleeve, set on expansion rod and for heat exchange pipe is expanded tube's expansion head, set on the rack and for controlling expansion sleeve clamping heat exchange pipe's clamping drive device, the movable setting on rack and for controlling expansion rod moves along axial expansion tube drive device and the movable setting on rack and for providing support to expansion rod's first guide device and second guide device, expansion tube drive device is between first guide device and second guide device, first guide device and second guide device are set to be switched between retracted state and unfolded state.The application is suitable for heat exchanger heat exchange pipe's expansion machine, adopt the structure of pair of guide plates, can effectively increase the service life of expansion rod and increase the product precision after expansion tube.

Description

Technical Field

[0001] This invention belongs to the technical field of heat exchanger production equipment. Specifically, this invention relates to a suspension expansion machine suitable for heat exchanger tubes. Background Technology

[0002] A heat exchanger mainly consists of heat exchange tubes and fins made of metal. The fins are fitted onto the heat exchange tubes. The heat exchange tubes perform the function of heat exchange, while the fins perform the function of heat dissipation.

[0003] In the production process of heat exchangers, metal heat exchange tubes and the fins fitted onto them need to be tightly combined to ensure good heat transfer and conduction, while also being lightweight and having a long service life. During production, the metal heat exchange tubes need to undergo tube expansion processing to increase their diameter. However, existing tube expansion equipment suffers from design flaws and unreasonable structural design, resulting in low accuracy in expanding the metal heat exchange tubes, low production efficiency, and short lifespan. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a tube expander suitable for heat exchangers, with the aim of improving the expansion accuracy of heat exchangers tubes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a heat exchanger tube expansion machine suitable for heat exchangers, comprising a frame, an expansion sleeve for accommodating the heat exchanger tube, an expansion rod inserted into the expansion sleeve, an expansion head disposed on the expansion rod for expanding the heat exchanger tube, a clamping drive device disposed on the frame for controlling the expansion sleeve to clamp the heat exchanger tube, a tube expansion drive device movably disposed on the frame for controlling the expansion rod to move axially, and a first guide device and a second guide device movably disposed on the frame for providing support to the expansion rod. The tube expansion drive device is located between the first guide device and the second guide device, and the first guide device and the second guide device are configured to switch between a contracted state and an expanded state.

[0006] Multiple expansion rods are provided. The expansion tube driving device includes a sliding seat, a movable plate disposed on the sliding seat, a roller disposed on the sliding seat and in contact with the frame, an expansion tube selection seat disposed on the movable plate, and an expansion tube selection mechanism disposed on the expansion tube selection seat for keeping the expansion rod to be expanded relatively fixed with the expansion tube selection seat. The number of expansion tube selection mechanisms is the same as the number of expansion rods.

[0007] The tube expansion selection mechanism includes a tube expansion selection block disposed inside the tube expansion selection seat for axially limiting the expansion rod to be expanded, and a first actuator for controlling the linear movement of the tube expansion selection block.

[0008] The expansion rod has a limiting groove, and the expansion tube selection block has a protrusion that is embedded in the limiting groove.

[0009] The clamping drive device includes a fixed plate, a fixed tube disposed on the fixed plate, a guide tube disposed inside the fixed tube and sleeved on the expansion sleeve, a connecting rod connected to the fixed plate, and a second actuator connected to the connecting rod and used to control the linear movement of the connecting rod. The second actuator is disposed on the frame.

[0010] Multiple expansion sleeves and multiple guide tubes are provided, with each guide tube fitted onto an expansion sleeve and each expansion sleeve fitted onto an expansion rod.

[0011] The first guiding device includes a first guide plate movably disposed on the frame, the first guide plate having a first guide hole through which the expansion rod passes. The second guiding device includes a second guide plate movably disposed on the frame, the second guide plate having a second guide hole through which the expansion rod passes. Multiple first guide plates and multiple second guide plates are provided, and the number of first guide plates and second guide plates is the same. Each first guide plate is connected to a second guide plate through a guide rod, and the connected first guide plates and second guide plates can move synchronously in a straight line.

[0012] When the first guide device is in the deployed state, two adjacent first guide plates are in a separated state; when the first guide device is in the retracted state, two adjacent first guide plates are in a contacting state; when the second guide device is in the deployed state, two adjacent second guide plates are in a separated state; when the second guide device is in the retracted state, two adjacent second guide plates are in a contacting state.

[0013] The expander suitable for heat exchanger tubes also includes a motor reducer mounted on the frame and a power transmission mechanism connected to the motor reducer and the tube expansion drive device.

[0014] The expansion machine suitable for heat exchanger tubes also includes hangers mounted on the frame, with multiple hangers provided.

[0015] This invention is suitable for the expansion machine of heat exchanger tubes and has the following advantages:

[0016] 1. The tube expansion selection mechanism can select the required expansion rod according to the position of the product expansion tube, reducing unnecessary movement of the expansion rod;

[0017] 2. The structure of paired guide plates can effectively extend the service life of the expansion rod and increase the product accuracy after tube expansion;

[0018] 3. The up and down position can be controlled using an electric hoist or a small overhead crane;

[0019] 4. The frame is welded using standard profiles, which can guide the internal expansion tube drive device and the guide plate to move back and forth, greatly reducing the overall size. Attached Figure Description

[0020] This manual includes the following figures, which illustrate the following:

[0021] Figure 1 This is a schematic diagram of the structure of the expansion machine of the present invention, which is suitable for heat exchanger tubes;

[0022] Figure 2 This is a cross-sectional view of the expansion machine of the present invention suitable for heat exchanger tubes;

[0023] Figure 3 This is another cross-sectional view of the expansion machine of the present invention suitable for heat exchanger tubes;

[0024] Figure 4 This is a cross-sectional view of the clamping drive device;

[0025] Figure 5 This is a schematic diagram of the expansion tube drive device.

[0026] Figure 6 This is a schematic diagram of the expansion tube drive device;

[0027] Figure 7 This is a cross-sectional view of the tube expansion drive device;

[0028] Figure 8 This is a schematic diagram of the second guide device in a retracted state;

[0029] Figure 9 This is a schematic diagram showing the connection between the first guide plate and the second guide plate;

[0030] Figure 10 This is a schematic diagram of the expansion sleeve structure;

[0031] Figure 11 This is a schematic diagram of the arrangement of the first guide plate;

[0032] The components in the diagram are labeled as follows: 1. Expansion sleeve; 2. Guide tube; 3. Fixed tube; 4. Expansion head; 5. Expansion rod; 6. Fixed plate; 7. First guide plate; 8. Connecting rod; 9. Second actuator; 10. Second synchronous pulley; 11. Fixed shaft; 12. Expansion tube selection mechanism; 13. Second guide plate; 14. Moving plate; 15. Sliding seat; 16. Second synchronous belt; 17. Third synchronous pulley; 18. Expansion tube selection seat; 19. Cylinder fixing plate; 20. Roller; 21. First actuator; 22. Expansion tube selection block; 23. Motor reducer; 24. H-shaped profile; 25. First synchronous pulley; 26. Hanger; 27. Tank chain; 28. Operation box; 29. ​​Handrail; 30. Frame; 31. Guide rod. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation.

[0034] like Figures 1 to 11 As shown, the present invention provides a heat exchanger tube expansion machine suitable for heat exchangers, including a frame 30, an expansion sleeve 1 for accommodating the heat exchanger tube, an expansion rod 5 inserted into the expansion sleeve 1, an expansion head 4 disposed on the expansion rod 5 for expanding the heat exchanger tube, a clamping drive device disposed on the frame 30 for controlling the expansion sleeve 1 to clamp the heat exchanger tube, a tube expansion drive device movably disposed on the frame 30 for controlling the expansion rod 5 to move axially, and a first guide device and a second guide device movably disposed on the frame 30 for providing support to the expansion rod 5. The tube expansion drive device is located between the first guide device and the second guide device, and the first guide device and the second guide device are configured to switch between a contracted state and an expanded state.

[0035] Specifically, such as Figures 1 to 4As shown, both the frame 30 and the expansion rod 5 have a certain length. The length direction of the frame 30 and the expansion rod 5 is parallel to the first direction, which is horizontal. Multiple expansion rods 5 are provided, and each expansion rod 5 has an expansion head 4 at its end. The expansion head 4 is fixedly connected to the expansion rod 5. The heat exchange tube is a metal tube. The expansion machine can expand at least two heat exchange tubes simultaneously at a time. The expansion rod 5 pushes the expansion head 4 into the end opening of the heat exchange tube, increasing the end diameter of the heat exchange tube. During the expansion operation, the expansion drive device drives the expansion rod 5 to move linearly along the axial direction. The expansion rod 5 drives the expansion head 4 to move synchronously, so that the expansion head 4 is inserted into the inner hole of the heat exchange tube, expanding the heat exchange tube and increasing the diameter of the metal heat exchange tube. During the movement of the expansion rod 5, the first guide device and the second guide device provide support for the expansion rod 5, keeping the expansion rod 5 stable. The expansion rod 5 will not bend or deform due to excessive length, which helps to improve the processing accuracy of the heat exchange tube expansion and makes the heat exchange tube expansion effect better.

[0036] like Figures 1 to 3 , Figures 5 to 7As shown, the tube expansion drive device includes a sliding seat 15, a movable plate 14 disposed on the sliding seat 15, a roller 20 disposed on the sliding seat 15 and in contact with the frame 30, a tube expansion selection seat 18 disposed on the movable plate 14, and a tube expansion selection mechanism 12 disposed on the tube expansion selection seat 18 for keeping the expansion rod 5 to be expanded relatively fixed to the tube expansion selection seat 18. The number of tube expansion selection mechanisms 12 is the same as the number of expansion rods 5. The movable plate 14 is fixedly disposed on the sliding seat 15, and the tube expansion selection seat 18 is fixedly connected to the movable plate 14. The expansion rod 5 passes through the tube expansion selection seat 18, and the tube expansion selection seat 18 has a guide hole for the expansion rod 5 to pass through. When expanding the heat exchange tube, the tube expansion selection mechanism 12 keeps the expansion rod 5 relatively fixed to the tube expansion selection seat 18, realizing the axial fixation of the expansion rod 5 on the tube expansion selection seat 18. The tube expansion drive device can drive the fixed expansion rod 5 to move linearly in a first direction synchronously, which is convenient and simple to operate. Rollers 20 are rotatably mounted on the sliding seat 15. Multiple rollers 20 are arranged in two rows on the sliding seat 15, with their axes parallel to the second direction. The outer surfaces of the rollers 20 contact the guide plane on the frame 30. The main body of the frame 30 is constructed by welding profiles, with H-shaped profiles 24 fixed to both sides within the frame 30 as guide sections. The tube expansion selection mechanism 12 mainly includes a tube expansion selection block 22 located inside the tube expansion selection seat 18 for axially limiting the expansion rod 5 to be expanded, and a first actuator 21 for controlling the linear movement of the tube expansion selection block 22. The expansion tube selection block 22 is movably disposed inside the expansion tube selection seat 18. When the expansion tube selection block 22 moves inside the expansion tube selection seat 18, its direction of movement is perpendicular to the first direction. The direction of movement of the expansion tube selection block 22 within the expansion tube selection seat 18 forms an acute angle with a second direction, which is horizontal and perpendicular to the first direction. The expansion rod 5 has a limiting groove, and the expansion tube selection block 22 has a protrusion that embeds into the limiting groove. The limiting groove is an annular groove extending circumferentially on the outer surface of the expansion rod 5. After the first actuator 21 pushes the expansion tube selection block 22 to move, causing the protrusion on the expansion tube selection block 22 to embed into the limiting groove on the expansion rod 5, the expansion tube selection block 22 can axially limit the expansion rod 5, keeping the expansion rod 5, which is to be expanded, relatively fixed to the expansion tube selection seat 18.

[0037] In this embodiment, as Figure 2 , Figure 6 and Figure 7As shown, the first actuator 21 is a cylinder. The expansion tube selection block 22 is fixedly connected to the piston rod of the first actuator 21. A cylinder fixing plate 19 is provided on the expansion tube selection seat 18, and the first actuator 21 is mounted on the cylinder fixing plate 19. Five expansion rods 5 are provided in total. One expansion rod 5 is positioned at the center, and the other four expansion rods 5 are arranged in a rectangle with the center rod 5 as the center point of the rectangle. Correspondingly, five expansion tube selection mechanisms 12 are provided. Four rollers 20 are provided on the sliding seat 15. The rollers 20 are bearings and are arranged in a rectangular shape. A tank chain 27 is installed on the inner side of the frame 30 to protect the cylinder connecting pipe. A sensor is installed on the other side inside the frame 30 to sense the position of the expansion tube selection part. Five first actuators 21 are provided, and each first actuator 21 is connected to one expansion tube selection block 22.

[0038] The tube expansion drive device with the above structure has the following advantages:

[0039] Structurally, the side guides utilize standard C-shaped steel welded into the frame, serving as both guides for the bearings and guide plates. This significantly reduces manufacturing costs. Before startup, the selection mechanism can be used to expand each heat exchange tube. The expansion selection mechanism clamps the expansion rod to be expanded, causing it to move linearly along with the sliding seat. This reduces unnecessary movements and increases the service life of the expansion rod.

[0040] During tube expansion, the tube expansion selector 18 drives the expansion rod 5, which is engaged by the expansion rod selector 22, to move linearly. The expansion rod 5 not engaged by the expansion rod selector 22 remains stationary. This links the movement of all expansion rods 5 to the cylinder's action, which is powered by an electrical signal. In actual tube expansion operations, both copper and stainless steel tubes are expanded. The thrust of the tube expander is limited. When expanding copper tubes, all expansion rods 5 may be set to expand simultaneously. However, when expanding stainless steel tubes, only one or two expansion rods 5 may be selected for expansion, depending on the situation. Selective adjustment of the expansion head can also be made to suit the workpiece's process arrangement. This adjustment is achieved through changes in electrical signals, making it relatively convenient.

[0041] like Figure 1 , Figure 2 and Figure 5As shown, the heat exchanger tube expansion machine of the present invention also includes a motor reducer 23 mounted on a frame 30 and a power transmission mechanism connected to the motor reducer 23 and the tube expansion drive device. The motor reducer 23 is fixedly mounted on the frame 30 and is used to generate driving force. The power transmission mechanism includes a first synchronous pulley 25, a second synchronous pulley 10, a third synchronous pulley 17, a first synchronous belt, and a second synchronous belt 16. The first synchronous pulley 25 is fixed on the output shaft of the motor reducer 23. A fixed shaft 11 is fixed on a bearing seat mounted on the frame 30. The axis of the fixed shaft 11 is parallel to the second direction. The second synchronous pulley 10 is coaxially fixedly connected to the fixed shaft 11. The first synchronous belt is sleeved on the first synchronous pulley 25 and the second synchronous pulley 10. The first synchronous pulley 25 rotates the second synchronous pulley 10 through the first synchronous belt. The second synchronous pulley 10 is located above the first synchronous pulley 25. The third synchronous pulley 17 is rotatably mounted on the frame 30. The second synchronous pulley 10 and the third synchronous pulley 17 are located at opposite ends of the length of the frame 30. The second synchronous belt 16 is fitted onto the second synchronous pulley 10 and the third synchronous pulley 17. The second synchronous pulley 10 rotates the third synchronous pulley 17 via the second synchronous belt 16. The sliding seat 15 is fixedly connected to the second synchronous belt 16. The length of the second synchronous belt 16 is parallel to the first direction. The sliding seat 15 is located between the second synchronous pulley 10 and the third synchronous pulley 17. The tube expansion drive device moves linearly between the second synchronous pulley 10 and the third synchronous pulley 17. When the motor reducer 23 is working, it drives the first synchronous pulley 25 to rotate. The first synchronous pulley 25 drives the second synchronous pulley 10 to rotate through the first synchronous belt. The second synchronous pulley 10 drives the third synchronous pulley 17 to rotate through the second synchronous belt 16. At the same time, the second synchronous belt 16 drives the tube expansion drive device to move linearly in the first direction. The power transmission mechanism converts the rotational motion of the motor reducer 23 into the linear motion of the tube expansion drive device.

[0042] like Figures 1 to 3 , Figure 8 , Figure 9 and Figure 11As shown, the first guiding device includes a first guide plate 7 movably mounted on the frame 30. The first guide plate 7 has first guide holes through which the expansion rods 5 pass. The number of first guide holes is the same as the number of expansion rods 5. The first guide plate 7 provides support for the expansion rods 5. Each expansion rod 5 passes through a first guide hole, which is a circular hole with a diameter approximately equal to that of the expansion rod 5. Multiple first guide plates 7 are provided, and all first guide plates 7 are arranged sequentially along the length of the frame 30. All first guide plates 7 are located between the clamping drive device and the expansion tube drive device. When the first guiding device is in the unfolded state, each pair of adjacent first guide plates 7 is in a separated state, with a certain distance between each pair of adjacent first guide plates 7. Each first guide plate 7 provides support for the expansion rod 5 at different positions along the length of the expansion rod 5, thereby reducing deformation of the expansion rod 5.

[0043] like Figures 1 to 3 , Figure 8 , Figure 9 and Figure 11 As shown, the second guiding device includes a second guide plate 13 movably mounted on the frame 30. The second guide plate 13 has second guide holes through which the expansion rods 5 pass. The number of second guide holes is the same as the number of expansion rods 5. The second guide plate 13 provides support for the expansion rods 5. Each expansion rod 5 passes through one second guide hole, which is a circular hole with a diameter approximately equal to that of the expansion rod 5. Multiple second guide plates 13 are provided, with the number of first guide plates 7 and second guide plates 13 being the same. All second guide plates 13 are arranged sequentially along the length of the frame 30, and are located between the clamping drive device and the expansion tube drive device. When the second guiding device is in the deployed state, each pair of adjacent second guide plates 13 is separated, with a certain distance between them. Each second guide plate 13 provides support for the expansion rod 5 at different positions along its length, thereby reducing deformation of the expansion rod 5. Each first guide plate 7 is connected to a second guide plate 13 via a guide rod 31, and the connected first guide plates 7 and second guide plates 13 can move linearly synchronously. The length direction of the guide rod 31 is parallel to the first direction. One end of each guide rod 31 is fixedly connected to a first guide plate 7, and the other end is fixedly connected to a second guide plate 13. The first guide plate 7 and the second guide plate 13 have through holes through which the guide rod 31 passes. All guide rods 31 are of the same length. The first guide plate 7 and the second guide plate 13 connected by the shortest guide rod 31 are located on opposite sides of the expansion tube drive device, and the sliding seat 15 is located between the first guide plate 7 and the second guide plate 13.

[0044] As the tube expansion drive device moves linearly toward the position close to the clamping drive device, the expansion rod 5 gradually extends into the inner hole of the heat exchange tube. When the sliding seat 15 contacts the nearest first guide plate 7, it can push the first guide plate 7 to move linearly synchronously. When the first guide plate 7 contacts another adjacent first guide plate 7, the sliding seat 15 simultaneously pushes the two first guide plates 7 to move linearly until the sliding seat 15 can simultaneously push all the first guide plates 7 to move linearly. At this time, the first guide device is in a retracted state, and each pair of adjacent first guide plates 7 is in contact. As each first guide plate 7 is pushed by the sliding seat 15 to move, the first guide device switches from an expanded state to a retracted state. Each first guide plate 7 drives a second guide plate 13 to move linearly synchronously through a guide rod 31, causing each second guide plate 13 to start moving linearly in sequence. The two adjacent second guide plates 13 separate, which is when the second guide device switches from a retracted state to an expanded state.

[0045] Conversely, as the tube expansion drive moves linearly away from the clamping drive, the expansion rod 5 is gradually pulled out of the inner hole of the heat exchange tube. When the sliding seat 15 contacts the nearest second guide plate 13, it can push the second guide plate 13 to move linearly synchronously. When the second guide plate 13 contacts another adjacent second guide plate 13, the sliding seat 15 pushes both second guide plates 13 to move linearly simultaneously until the sliding seat 15 can push all the second guide plates 13 to move linearly simultaneously. At this time, the second guide device is in a retracted state, and each pair of adjacent second guide plates 13 is in contact. During the movement of each second guide plate 13 by being pushed by the sliding seat 15, the second guide device switches from an expanded state to a retracted state. Each second guide plate 13 drives a first guide plate 7 to move linearly synchronously through a guide rod 31, causing each first guide plate 7 to start moving linearly in sequence. The two adjacent first guide plates 7 separate, which is when the first guide device switches from a retracted state to an expanded state.

[0046] like Figures 1 to 3 , Figure 8 , Figure 9 and Figure 11 As shown, there are 14 of each of the first guide plate 7 and the second guide plate 13.

[0047] The guide device with the above structure can guide the expansion rod when a long stroke is required for the expansion tube. This is achieved by adding pairs of guide plates, ensuring that the expansion rod moves continuously within the guide holes in the guide plates during linear motion. This reduces deformation of the expansion rod during long-distance movement and significantly increases its service life.

[0048] like Figures 1 to 4 and Figure 10As shown, the clamping drive device and the first synchronous pulley 25 are located at the same end of the frame 30 along its length. The clamping drive device includes a fixed plate 6, a fixed tube 3 disposed on the fixed plate 6, a guide tube 2 disposed inside the fixed tube 3 and sleeved on the expansion sleeve 1, a connecting rod 8 connected to the fixed plate 6, and a second actuator 9 connected to the connecting rod 8 and used to control the connecting rod 8 to move linearly along the first direction. The second actuator 9 is disposed on the frame 30. One end of the connecting rod 8 along its length is connected to the second actuator 9, and the other end of the connecting rod 8 along its length is fixedly connected to the fixed plate 6. The length direction of the connecting rod 8 is parallel to the first direction. The fixed plate 6 is movably disposed on the frame 30. Multiple expansion sleeves 1 and guide tubes 2 are provided. The number of expansion sleeves 1 and guide tubes 2 is the same as the number of expansion rods 5. Each guide tube 2 is sleeved on one expansion sleeve 1, and each expansion sleeve 1 is sleeved on one expansion rod 5. All guide tubes 2 are fixedly connected to the fixed tube 3. One end of the fixed tube 3 is fixedly connected to the fixed plate 6, and the other end of the fixed tube 3 is provided with a through hole for the guide tube 2 to pass through. The guide tube 2 is a cylinder with open ends and a hollow interior. The axis of the guide tube 2 is parallel to the first direction. One end of the guide tube 2 is fixedly connected to the fixed plate 6, and the opening at the other end of the guide tube 2 is provided with a mating surface that contacts the expansion sleeve 1. This mating surface is a conical surface. The expansion sleeve 1 is a cylinder with open ends and a hollow interior. The axis of the expansion sleeve 1 is parallel to the first direction. One end of the expansion sleeve 1 along its length is fixedly connected to the frame 30, and the other end of the expansion sleeve 1 is located outside the guide tube 2. This end of the expansion sleeve 1 is a clamping end used to clamp the heat exchange tube, and the heat exchange tube that needs to be expanded can be inserted into the inner hole of the expansion sleeve 1 from this end of the expansion sleeve 1. The expansion rod 5 extends into the inner hole of the expansion sleeve 1, and the expansion rod 5 can push the expansion head 4 into the inner hole of the heat exchange tube.

[0049] like Figures 1 to 4 and Figure 10As shown, the expansion sleeve 1 is used to clamp the heat exchange tube. The expansion sleeve 1 includes a connecting sleeve and expansion blocks connected to the connecting sleeve. Multiple expansion blocks are provided, and all expansion blocks are evenly distributed circumferentially on the connecting sleeve. The connecting sleeve is located in the inner hole of the guide tube 2. One end of the connecting sleeve is fixedly connected to the frame 30, and the other end of the expansion block is fixedly connected to the connecting sleeve. The expansion block has a certain elasticity and can deflect relative to the connecting sleeve. The expansion block has an arc-shaped structure, and there is a certain gap between adjacent expansion blocks. The end of the expansion block is fixedly connected to the edge of the connecting sleeve. One end of the expansion block is located in the inner hole of the guide tube 2, and the expansion block has a pressure-bearing surface for contacting the mating surface of the guide tube 2. This pressure-bearing surface is a conical surface. After the heat exchange tube to be expanded is manually inserted into the expansion sleeve 1, the second actuator 9 pushes the connecting rod 8 and the fixing plate 6 to move linearly away from the frame 30. The fixing plate 6 drives the fixing tube 3 and the guide tube 2 to move linearly synchronously. When the mating surface of the guide tube 2 contacts the pressure surface of the expansion block, the guide tube 2 pushes all the expansion blocks to deflect relative to the connecting sleeve towards the axis of the connecting sleeve (i.e., the axis of the expansion sleeve 1), so that the expansion blocks contact the heat exchange tube, thereby reducing the inner diameter of the clamping end of the expansion sleeve 1, thus achieving the effect of clamping the heat exchange tube, aligning the heat exchange tube with the expansion head 4, and keeping the heat exchange tube and the expansion head 4 coaxial. After the tube expansion operation is completed, the mating surface of the guide tube 2 separates from the pressure surface of the expansion block. Under the action of its own elasticity, the expansion block deflects relative to the connecting sleeve towards the axis away from the connecting sleeve, thereby increasing the inner diameter of the clamping end of the expansion sleeve 1. The expansion sleeve 1 no longer clamps the heat exchange tube, making it easier to pull out the heat exchange tube.

[0050] like Figures 1 to 4 As shown, in this embodiment, the second actuator 9 is a cylinder. Multiple connecting rods 8 and second actuators 9 are provided, and the number of connecting rods 8 and second actuators 9 is the same. Each second actuator 9 is connected to the fixing plate 6 via a connecting rod 8. The expansion sleeve 1 and the guide tube 2 are concentric, and the expansion rod 5 is also concentric within the expansion sleeve 1. The expansion head 4 is fixed to the front end of the expansion rod 5 and is concentric. The outer surface of the expansion head 4 is a bevel and a cylindrical surface, and the front end is wire-cut into a petal shape to facilitate expansion and contraction of its shape.

[0051] like Figure 1 As shown, the heat exchanger tube expansion machine of the present invention also includes a hanger 26 mounted on a frame 30. Multiple hangers 26 are provided, and all hangers 26 are arranged sequentially along the length of the frame 30. The hangers 26 are fixedly connected to the frame 30. A lifting ring is provided at the top of the hanger 26 for the hook of a lifting device to be engaged. The frame 30 can be raised and lowered by controlling the lifting device, such as an electric hoist or a small trolley. Therefore, the vertical position of the expansion machine can be controlled according to the electric hoist or the small trolley, satisfying the tube expansion operation at different positions on the heat exchanger.

[0052] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A lifting expansion machine suitable for heat exchanger tubes, comprising a frame, characterized in that: It also includes an expansion sleeve for accommodating the heat exchange tube, an expansion rod inserted into the expansion sleeve, an expansion head disposed on the expansion rod for expanding the heat exchange tube, a clamping drive device disposed on the frame for controlling the expansion sleeve to clamp the heat exchange tube, a tube expansion drive device movably disposed on the frame for controlling the expansion rod to move axially, and a first guide device and a second guide device movably disposed on the frame for providing support to the expansion rod. The tube expansion drive device is located between the first guide device and the second guide device, and the first guide device and the second guide device are configured to switch between a contracted state and an expanded state. When expanding the heat exchange tube, the tube expansion drive device drives the expansion rod to move linearly along the axial direction. The expansion rod drives the expansion head to move synchronously, so that the expansion head is inserted into the inner hole of the heat exchange tube, thereby expanding the heat exchange tube and increasing the diameter of the metal heat exchange tube. The tube expansion drive device includes a sliding seat, a movable plate disposed on the sliding seat, a roller disposed on the sliding seat and in contact with the frame, a tube expansion selection seat disposed on the movable plate, and a tube expansion selection mechanism disposed on the tube expansion selection seat for keeping the tube expansion rod to be expanded relatively fixed to the tube expansion selection seat. The number of tube expansion selection mechanisms is the same as the number of tube expansion rods. The movable plate is fixedly mounted on the sliding seat, and the tube expansion selection seat is fixedly connected to the movable plate. The expansion rod passes through the tube expansion selection seat, which has a guide hole for the expansion rod to pass through. When expanding the heat exchange tube, the tube expansion selection mechanism keeps the expansion rod and the tube expansion selection seat relatively fixed, thereby achieving axial fixation of the expansion rod on the tube expansion selection seat. The tube expansion drive device can drive the fixed expansion rod to move linearly in the first direction synchronously. The rollers are rotatably mounted on the sliding seat. The rollers are cylindrical and there are multiple rollers. All rollers are arranged in two rows on the sliding seat. The axis of the rollers is parallel to the second direction, and the outer surface of the rollers is in contact with the guide plane on the frame. The tube expansion selection mechanism includes a tube expansion selection block disposed inside the tube expansion selection seat and used to axially limit the expansion rod to be expanded, and a first actuator used to control the linear movement of the tube expansion selection block; the tube expansion selection block is movably disposed inside the tube expansion selection seat, the direction of movement of the tube expansion selection block inside the tube expansion selection seat is perpendicular to the first direction, the direction of movement of the tube expansion selection block inside the tube expansion selection seat has an angle with the second direction and the angle is acute, the second direction is horizontal and perpendicular to the first direction; The expansion rod has a limiting groove, and the expansion tube selection block has a protrusion that is embedded in the limiting groove. The limiting groove is an annular groove that extends along the entire circumference on the outer surface of the expansion rod. After the first actuator pushes the expansion tube selection block to move, so that the protrusion on the expansion tube selection block is embedded in the limiting groove on the expansion rod, the expansion tube selection block can limit the expansion rod in the axial direction, so that the expansion rod to be expanded and the expansion tube selection seat remain relatively fixed. The first guiding device includes a first guide plate movably disposed on the frame, the first guide plate having a first guide hole through which the expansion rod passes; the second guiding device includes a second guide plate movably disposed on the frame, the second guide plate having a second guide hole through which the expansion rod passes; multiple first guide plates and multiple second guide plates are provided, and the number of first guide plates and second guide plates is the same; each first guide plate is connected to a second guide plate via a guide rod, and the connected first guide plate and second guide plate can move synchronously in a straight line. When the first guide device is in the deployed state, two adjacent first guide plates are in a separated state, with a certain distance between each pair of adjacent first guide plates, and each first guide plate provides support to the expansion rod at different positions along the length of the expansion rod; when the first guide device is in the retracted state, two adjacent first guide plates are in contact with each other. When the second guide device is in the deployed state, two adjacent second guide plates are in a separated state, with a certain distance between each pair of adjacent second guide plates, and each second guide plate provides support for the expansion rod at different positions along the length of the expansion rod; when the second guide device is in the retracted state, two adjacent second guide plates are in a contact state.

2. The expansion machine suitable for heat exchanger tubes according to claim 1, characterized in that: The first actuator is a cylinder. The expansion tube selection block is fixedly connected to the piston rod of the first actuator. A cylinder fixing plate is provided on the expansion tube selection seat, and the first actuator is mounted on the cylinder fixing plate.

3. The expansion machine suitable for heat exchanger tubes according to claim 1, characterized in that: There are a total of five expansion rods, one of which is positioned at the center, and the other four expansion rods are arranged in a rectangle with the central expansion rod as the center point of the rectangle. Correspondingly, there are five expansion tube selection mechanisms.

4. The expansion machine suitable for heat exchanger tubes according to any one of claims 1 to 3, characterized in that: The clamping drive device includes a fixed plate, a fixed tube disposed on the fixed plate, a guide tube disposed inside the fixed tube and sleeved on the expansion sleeve, a connecting rod connected to the fixed plate, and a second actuator connected to the connecting rod and used to control the linear movement of the connecting rod. The second actuator is disposed on the frame.

5. The expansion machine suitable for heat exchanger tubes according to claim 4, characterized in that: Multiple expansion sleeves and multiple guide tubes are provided, with each guide tube fitted onto an expansion sleeve and each expansion sleeve fitted onto an expansion rod.

6. The expansion machine suitable for heat exchanger tubes according to any one of claims 1 to 3, characterized in that: One end of each guide rod along its length is fixedly connected to a first guide plate, and the other end of each guide rod along its length is fixedly connected to a second guide plate. The first and second guide plates have through holes through which the guide rods pass.

7. The expansion machine suitable for heat exchanger tubes according to any one of claims 1 to 3, characterized in that: There are 14 of each of the first and second guide plates.

8. The expansion machine suitable for heat exchanger tubes according to any one of claims 1 to 3, characterized in that: It also includes a motor reducer mounted on the frame and a power transmission mechanism connected to the motor reducer and the tube expansion drive device.

9. The expansion machine suitable for heat exchanger tubes according to any one of claims 1 to 3, characterized in that: It also includes hangers mounted on the frame, with multiple hangers provided.

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