Heat exchanger hydraulic pipe expansion equipment and pipe expansion control method thereof

Abstract

The invention belongs to the technical field of heat exchanger tube expansion, and particularly relates to heat exchanger hydraulic tube expansion equipment and a tube expansion control method thereof.The heat exchanger hydraulic tube expansion equipment comprises a vertical frame body, a movable main frame body, a main driving mechanism driving the movable main frame body to reciprocate in the height direction of the vertical frame body, and a movable positioning frame reciprocating along with the movable main frame body; the first driving mechanism is used for driving the movable positioning frame to independently move in a reciprocating mode in the height direction of the vertical frame body of the movable positioning frame, and the upper ends of the pipe expanding assemblies are fixed to the movable main frame body and move in a reciprocating mode along with the movable main frame body. The pipe expansion assembly comprises an internal hard water pipe and an expansion pipe arranged on the hard water pipe in a sleeving mode, a pipe pinching sealing assembly is arranged on the movable positioning frame, water-filled expansion pipe expansion is adopted, the length of the expansion pipe can be controlled, pipe expansion can be conducted on an area needing pipe expansion, damage to a copper pipe can be effectively avoided in the pipe expansion process, and the pipe pinching sealing assembly is arranged on the movable positioning frame. The strength is ensured, and the product quality can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchanger tube expansion, and in particular relates to a heat exchanger hydraulic tube expansion device and a tube expansion control method thereof. Background Art

[0002] In order to ensure good heat transfer between the fins and the tubes of the tube-fin heat exchanger, the tubes need to be expanded. Currently, mechanical expansion is more commonly used, but mechanical expansion has disadvantages.

[0003] 1. The mechanical expansion tube needs to be inserted into the copper tube for expansion, which causes the wall thickness of the copper tube inlet to become thinner. This part needs to be welded with the copper tube of the water inlet and outlet pipes later. Flame welding will cause further damage to the thin-walled copper tube here. This part is more likely to be damaged in later use, affecting product quality and service life;

[0004] 2. If the wall thickness of copper tubes with the same outer diameter is different, resulting in different inner diameters of the copper tubes, the expansion head of the mechanical expansion tube also needs to be adjusted in specifications, so it is necessary to configure expansion heads of various specifications;

[0005] 3. The expansion head of the mechanical expansion tube is subject to wear and tear. The diameter of the expansion head needs to be measured regularly to ensure that the copper tube and the fin can be tightened. Frequent maintenance and replacement are required.

[0006] In addition, another way to expand the tube is water expansion. After the inlet and outlet pipes are welded, high-pressure water is passed through the entire heat exchanger to expand the copper tube. This method will damage the bend on the tail side, because the copper tube will be stretched after bending, the bend is the weakest and there is no fin restraint on the outside, the pressure resistance is poor, and the bend will be deformed if the water pressure is too high. This place is easy to be damaged in later use. If the water pressure is low, the copper tube and the fin cannot be tightly expanded. Summary of the invention

[0007] The present invention provides a heat exchanger hydraulic tube expansion device and a tube expansion control method thereof, which can solve the problems pointed out in the background technology.

[0008] A heat exchanger hydraulic tube expansion device and a tube expansion control method thereof, comprising a vertical frame, a movable main frame, a main driving mechanism for driving the movable main frame to reciprocate along the height direction of the vertical frame, a movable positioning frame that reciprocates with the movable main frame, a first driving mechanism for driving the movable positioning frame to reciprocate independently along the height direction of the vertical frame, and a plurality of tube expansion assemblies;

[0009] The main driving mechanism includes a main driving motor and main screw rods on both sides arranged on the vertical frame body, wherein the main driving motor drives the main screw rods on both sides through the main transmission system, and screw rod sleeves cooperating with the main screw rods on both sides are respectively arranged on both sides of the movable main frame body, and the movable main frame body is driven to slide back and forth by the main screw rods;

[0010] The first driving mechanism includes a first driving motor and first screw rods on both sides arranged on the movable main frame, the first driving motor drives the first screw rods on both sides through the second transmission system, and screw rod sleeves cooperating with the first screw rods on both sides are respectively arranged on both sides of the movable positioning frame, and the movable positioning frame is driven to slide reciprocatingly by the first screw rod;

[0011] The upper ends of the plurality of expansion tube assemblies are fixed on the movable main frame to follow its reciprocating motion. The expansion tube assembly includes an internal hard water pipe and an expansion tube sleeved on the hard water pipe. A water hole is provided between the hard water pipe and the expansion tube. The upper end of the hard water pipe is connected to a high-pressure water pipe. The upper and lower ends of the expansion tube are sealed. The plurality of expansion tube assemblies all pass through the movable positioning frame. The movable positioning frame is provided with a pinch tube sealing assembly. The pinch tube sealing assembly is used to seal the expansion tube assembly at this point to prevent the upper expansion tube assembly from being filled with water and expanding the tube.

[0012] The lower end of the movable positioning frame is provided with a plurality of protective sleeves corresponding to the expansion tube assemblies one by one, and the expansion tube assembly passes through the protective sleeve, and the protective sleeve is provided to prevent the expansion of the copper tube inlet of the heat exchanger; the tube pinching sealing assembly includes a plurality of rubber plug sleeves and a second driving mechanism for driving the rubber plug sleeves to rotate, and the movable positioning frame is provided with a plurality of "trumpet-shaped" positioning holes corresponding to the rubber plug sleeves one by one, and the lower end of the rubber plug sleeve is threadedly connected with the "trumpet-shaped" positioning hole, and the expansion tube assembly passes through the rubber plug sleeve and the protective sleeve in turn, and the rubber plug sleeve is driven to rotate by the second driving mechanism. The second driving mechanism comprises a second driving motor arranged on the movable positioning frame, and movable parallel rods arranged in parallel on both sides of the second driving motor, the output end of the second driving motor is connected to the main transmission rod, and the two ends of the main transmission rod are respectively hingedly connected to the movable parallel rods on both sides, and each rubber plug sleeve is connected to a slave transmission rod, and the two ends of the slave transmission rod are respectively hingedly connected to the movable parallel rods on both sides.

[0013] Preferably, the stand body includes a bottom platform, guide rail columns on both sides and a top frame.

[0014] Preferably, the upper end of the hard water pipe is fixedly connected to the movable main frame by bolts, and the upper end of the hard water pipe is provided with a threaded portion cooperating with the bolts, and the bolts are located at the upper end of the movable main frame.

[0015] Preferably, both ends of the expansion tube assembly are sealed and locked by locking nuts, and both ends of the hard water pipe are provided with threaded parts matching with the locking nuts.

[0016] Preferably, a guide is provided at the lower end of the tube expansion assembly to facilitate the passage of the tube expansion assembly into the heat exchanger and to guide it.

[0017] Preferably, the guide member is a conical guide head.

[0018] A tube expansion control method for a tube expansion device, the tube expansion control method comprising: a movable main frame and a movable positioning frame are in an initial position, a heat exchanger is fixed on a bottom platform below, a system setting is performed according to the copper tube length of the heat exchanger, the movable main frame is driven down by a main driving mechanism, the lower end of the tube expansion assembly enters through a copper tube inlet under a guide, and after reaching the set position, the movable main frame stops moving;

[0019] The movable positioning frame is driven to descend by the first driving mechanism, the protective sleeve is completely inserted into the upper end of the copper tube, and the movable positioning frame stops moving;

[0020] The second driving mechanism drives the rubber plug sleeve to rotate, pinching and sealing the expansion tube at this location, thereby preventing the expansion tube assembly at the upper side from being filled with water and expanding the tube;

[0021] Start the high-pressure water pump to pressurize the tube expansion, release the pressure after the tube expansion is completed, and the water is partially discharged from the tube expansion assembly. The second driving mechanism drives the rubber plug sleeve to reverse, the rubber plug sleeve is loosened, and the movable main frame and the movable positioning frame rise to the initial position to carry out the tube expansion operation of the next heat exchanger;

[0022] During the tube expansion process, pressure and water volume control are required.

[0023] The amount of water supplied is calculated as follows:

[0024] The outer diameter D1 and wall thickness δ1 of the copper tube before expansion and the required outer diameter D2 of the copper tube after expansion are three parameters. The density change of the copper tube is ignored. The calculation formula for calculating the wall thickness δ2 of the copper tube after expansion is as follows:

[0025]

[0026] Because they are all numerical calculations, the letter δ2 can be directly used to represent the wall thickness of the copper tube after expansion, and the calculation formula will no longer be converted;

[0027] The water requirement Q for a single copper tube with an expansion length of L is calculated as follows:

[0028]

[0029] Where D2, δ2, L are known values, and C is the volume occupied by the expansion tube and the water supply conduit per unit length;

[0030] Beneficial effects: The present invention provides a heat exchanger hydraulic tube expansion device and a tube expansion control method thereof, which adopts water-filled tube expansion and can control the length of the expanded tube, and can expand the tube in the area where the tube is required to be expanded. During the tube expansion process, damage to the copper tube can be effectively avoided, and its strength can be guaranteed, which can improve product quality. It can also adapt to the expansion of copper tubes of various diameters within a certain range, and daily maintenance is relatively simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention,

[0032] Figure 2 For the present invention Figure 1 The enlarged schematic diagram of point A in the middle.

[0033] Figure 3 For the present invention Figure 1 The enlarged schematic diagram of point B in the middle,

[0034] Figure 4 is a schematic structural diagram of the pinch tube sealing assembly of the present invention,

[0035] Description of reference numerals:

[0036] Numbers in the figure: frame body 1; bottom platform 11; guide rail column 12; top frame 13; movable main frame body 2; main drive motor 31; main screw rod 32; main transmission system 33; movable positioning frame 4; protective sleeve 41; "trumpet-shaped" positioning hole 42; first drive motor 51; first screw rod 52; second transmission system 53; expansion tube assembly 6; hard water pipe 61; expansion tube 62; bolt 63; locking nut 64; guide 65; pinch tube sealing assembly 7; second drive motor 71; movable parallel rod 72; main transmission rod 73; transmission rod 74; rubber plug sleeve 75; heat exchanger 8; copper tube 9; bottom fixing seat 10; limit clip 20; fixing column 30; handwheel assembly 40. DETAILED DESCRIPTION

[0037] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0038] Example:

[0039] like Figure 1-4As shown, a heat exchanger hydraulic tube expansion device and a tube expansion control method thereof provided by an embodiment of the present invention include a vertical frame body 1, a movable main frame body 2, a main driving mechanism driving the movable main frame body 2 to reciprocate along the height direction of the vertical frame body 1, and a movable positioning frame 4 that reciprocates following the movable main frame body 2. The vertical frame body 1 includes a bottom platform 11, guide rail columns 12 on both sides, and a top frame 13. The bottom platform 11 has a certain deadweight and can ensure stability. In order to ensure stability, both ends of the movable main frame body 2 and both ends of the movable positioning frame 4 can be slidably connected to the guide rail columns 12 on both sides, respectively. However, under the action of each screw rod, its sliding stability itself is also guaranteed; the main driving mechanism includes a main driving motor 31 arranged on the frame body 1 and main screw rods 32 on both sides. The upper and lower ends of the main screw rods 32 on both sides are rotatably connected to the guide rail columns 12 on the corresponding sides through bearing assemblies. The main driving motor 31 drives the main screw rods 32 on both sides through the main transmission system 33. The main transmission system 33 can be a synchronous belt drive or a chain drive. The two sides of the movable main frame body 2 are respectively provided with screw rod sleeves that cooperate with the main screw rods 32 on both sides, and the movable main frame body 2 is driven to slide back and forth through the main screw rods 32.

[0040] A first driving mechanism and a plurality of expansion tube assemblies are provided for driving the movable positioning frame 4 to reciprocate independently along the height direction of its upright frame body 1. The first driving mechanism includes a first driving motor 51 and first screw rods 52 on both sides arranged on the movable main frame body 2. The first driving motor 51 drives the first screw rods 52 on both sides through a second transmission system 53. The second transmission system 53 can be a synchronous belt drive or a chain drive. Screw rod sleeves cooperating with the first screw rods 52 on both sides are respectively provided on both sides of the movable positioning frame 4. The movable positioning frame 4 is driven to slide back and forth through the first screw rod 52. The upper end of the first screw rod 52 is connected to the movable main frame body 2 through a bearing assembly.

[0041] The upper ends of several expansion tube assemblies 6 are fixed on the movable main frame 2 and follow its reciprocating motion. The expansion tube assembly 6 includes an internal hard water pipe 61 and an expansion tube 62 sleeved on the hard water pipe 61. Specifically, the upper end of the hard water pipe 61 is fixedly connected to the movable main frame 2 by a bolt 63. The upper end of the hard water pipe 61 is provided with a threaded portion that cooperates with the bolt 63. The bolt 63 is located at the upper end of the movable main frame 2. The hard water pipe 61 can be a hard metal pipe, such as a stainless steel pipe, a galvanized steel pipe, etc. The expansion tube 62 can be a flexible elastic expansion tube, such as a rubber tube, a silicone tube, etc. A water hole is provided between the hard water pipe 61 and the expansion tube 62. The upper end of the hard water pipe 61 is connected to a high-pressure water pipe, which is supplied with water by a high-pressure water pump. The upper and lower ends of the expansion tube 62 are sealed. Specifically, the two ends of the expansion tube assembly 6 are respectively sealed and locked by locking nuts 64, and the two ends of the hard water pipe 61 are respectively provided with threaded portions that cooperate with the locking nuts 64.

[0042] The plurality of expansion tube assemblies 6 all pass through the movable positioning frame 4, and a pinch tube sealing assembly 7 is provided on the movable positioning frame 4. The pinch tube sealing assembly 7 is used to seal the expansion tube assembly 6 at this point to prevent the expansion tube assembly 6 on the upper side from being filled with water and expanding. The pinch tube sealing assembly 7 includes a plurality of rubber plug sleeves 75 and a second driving mechanism for driving the rubber plug sleeves 75 to rotate. The movable positioning frame 4 is provided with a plurality of "trumpet-shaped" positioning holes 42 corresponding to the rubber plug sleeves 75 one by one. The lower end of the rubber plug sleeve 75 is threadedly connected with the "trumpet-shaped" positioning hole 42. The expansion tube assembly 6 passes through the rubber plug sleeve 75 and the protective sleeve 41 in turn, and the rubber plug sleeve 75 is driven to rotate by the second driving mechanism so that the lower end of the rubber plug sleeve 75 is screwed into the "trumpet-shaped" positioning hole 42. The "trumpet-shaped" positioning hole 42 has a conical shape below. After the lower end of the rubber plug sleeve 75 is screwed in, it is squeezed and deformed by the lower end of the "trumpet-shaped" positioning hole 42 to pinch and seal the expansion tube 62 here, so as to prevent the upper expansion tube assembly 6 from being filled with water and expanding the tube. The second driving mechanism includes a second driving motor 71 arranged on the movable positioning frame 4, and movable parallel rods 72 arranged in parallel on both sides of the second driving motor 71. The output end of the second driving motor 71 is connected to the main transmission rod 73, and the two ends of the main transmission rod 73 are respectively hingedly connected to the movable parallel rods 72 on both sides. Each rubber plug sleeve 75 is connected to a slave transmission rod 74, and the two ends of the slave transmission rod 74 are respectively hingedly connected to the movable parallel rods 72 on both sides.

[0043] The lower end of the movable positioning frame 4 is provided with a plurality of protective sleeves 41 corresponding to the expansion tube assemblies 6 one by one. The expansion tube assembly 6 passes through the protective sleeve 41. The protective sleeve 41 is provided to avoid expansion of the copper tube 9 at the inlet of the heat exchanger. That is, the protective sleeve 41 is provided here to avoid the expansion of the expansion tube 62 here due to water filling and expansion to avoid expansion of the copper tube 9 at the inlet of the heat exchanger.

[0044] In some embodiments, a guide 65 is provided at the lower end of the expansion tube assembly 6 to facilitate the expansion tube assembly 6 to enter the heat exchanger and pass through and be guided. The guide 65 is a conical guide head, which can be a rubber head.

[0045] The working principle or operation mode of the present invention is as follows: the movable main frame 2 and the movable positioning frame 4 are in the initial position, the heat exchanger 8 is fixed on the bottom platform 11 below, and the fixing tool can adopt the fixing tool of the mechanical expansion tube in the prior art, and the fixing tool includes a bottom fixing seat 10, and the bottom fixing seat 10 is provided with a limiting slot hole that matches the bottom of the heat exchanger 8. The bottom fixing seat 10 can be detachably connected to the bottom platform 11 by bolts, so that different bottom fixing seats 10 can be replaced to match different heat exchangers 8. In order to increase stability, a limiting clip 20 is provided on each side of the heat exchanger 8, wherein the two ends of the limiting clip 20 on one side are fixed on the fixing columns 30 on both sides, and one end of the limiting clip 20 on the other side is hingedly connected to the fixing column 30 on one side, and the other side is connected to the fixing column 30 on the other side through the hand wheel assembly 40; The system is set according to the length of the copper tube 9 of the heat exchanger 8. The movable main frame 2 is driven down by the main driving mechanism. The lower end of the expansion tube assembly 6 enters from the inlet of the copper tube 9 under the guidance of the guide 65. After reaching the set position (the guide 65 is at the lower elbow of the heat exchanger), the movable main frame 2 stops moving; then the movable positioning frame 4 is driven down by the first driving mechanism, the protective sleeve 41 completely penetrates into the upper end of the copper tube, the movable positioning frame 4 stops moving, and the second driving mechanism drives the rubber plug sleeve 75 to rotate to pinch and seal the expansion tube 62 here to avoid the upper side expansion tube assembly 6 here from being filled with water, that is, only the side expansion tube assembly 6 here needs to be filled with water, and the expansion tube length can be adjusted by the cooperation of the movable positioning frame 4, the pinching tube sealing assembly 7 and the protective sleeve 41, and the corresponding adjustment and setting are performed according to the actual expansion tube length of the copper tube 9;

[0046] It should be noted that the lowering height setting of the movable main frame 2 and the movable positioning frame 4 can be achieved by setting a plurality of position switches, or by a motor and a program with a control function, and inputting corresponding data such as the length of the heat exchanger 8 and the copper tube 9, and the system controls the movable main frame 2 and the movable positioning frame 4 to automatically move to the corresponding position;

[0047] Start the high-pressure water pump to pressurize and expand the tube. After the expansion is completed, the pressure is released and the water is partially discharged from the expansion assembly 6. The second driving mechanism drives the rubber plug sleeve 75 to reverse, the rubber plug sleeve 75 is loosened, and the movable main frame 2 and the movable positioning frame 4 rise to the initial position to carry out the expansion operation of the next heat exchanger.

[0048] It should be noted that during the tube expansion process, pressure and water volume control are required.

[0049] In the water supply pipeline, water volume and pressure sensors need to be installed. The water supply volume is calculated as follows:

[0050] The outer diameter D1 and wall thickness δ1 of the copper tube 9 before expansion and the required outer diameter D2 of the copper tube 9 after expansion are three parameters. The density change of the copper tube 9 is ignored. The calculation formula for calculating the wall thickness δ2 of the copper tube 9 after expansion is as follows:

[0051]

[0052] Because they are all numerical calculations, the letter δ2 can be directly used to represent the wall thickness of the copper tube after expansion, and the calculation formula will no longer be converted.

[0053] The water requirement Q for expansion of a single copper tube 9 with an expansion length of L is calculated as follows:

[0054]

[0055] Where D2, δ2, L are known values, and C is the volume occupied by the expansion tube 62 and the water supply conduit per unit length;

[0056] Theoretically, the above amount of water can be used to expand the tube. Considering that the water supply pipeline may be damaged and leaking, another judgment parameter pressure is introduced. The judgment logic is that when the water supply reaches the required water volume, the water supply is shut off, and the pressure of the water supply pipeline is within the pressure range and remains stable. The pressure holding time should not be too long to avoid excessive deformation of the copper tube due to unevenness and low tube expansion efficiency.

[0057] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A heat exchanger hydraulic tube expansion device, characterized in that: It comprises a vertical frame (1), a movable main frame (2), a main driving mechanism for driving the movable main frame (2) to reciprocate along the height direction of the vertical frame (1), a movable positioning frame (4) that reciprocates along with the movable main frame (2), a first driving mechanism for driving the movable positioning frame (4) to reciprocate independently along the height direction of the vertical frame (1), and a plurality of expansion tube assemblies (6); The main driving mechanism comprises a main driving motor (31) and main screw rods (32) on both sides arranged on the vertical frame body (1); the main driving motor (31) drives the main screw rods (32) on both sides through a main transmission system (33); screw rod sleeves cooperating with the main screw rods (32) on both sides are respectively arranged on both sides of the movable main frame body (2); the movable main frame body (2) is driven to slide back and forth through the main screw rods (32); The first driving mechanism comprises a first driving motor (51) and first screw rods (52) on both sides, which are arranged on the movable main frame (2); the first driving motor (51) drives the first screw rods (52) on both sides through a second transmission system (53); screw rod sleeves cooperating with the first screw rods (52) on both sides are respectively arranged on both sides of the movable positioning frame (4); the movable positioning frame (4) is driven to slide back and forth through the first screw rod (52); The upper ends of the plurality of expansion tube assemblies (6) are fixed on the movable main frame (2) and follow the reciprocating movement thereof. The expansion tube assembly (6) comprises an internal hard water pipe (61) and an expansion tube (62) sleeved on the hard water pipe (61). A water hole is provided between the hard water pipe (61) and the expansion tube (62). The upper end of the hard water pipe (61) is connected to a high-pressure water pipe. The upper and lower ends of the expansion tube (62) are sealed. The plurality of expansion tube assemblies (6) all pass through the movable positioning frame (4). The movable positioning frame (4) is provided with a pinch tube sealing assembly (7). The pinch tube sealing assembly (7) seals the expansion tube assembly (6) at this location to prevent the upper side expansion tube assembly (6) from being filled with water and expanding. The lower end of the movable positioning frame (4) is provided with a plurality of protective sleeves (41) corresponding to the expansion tube assemblies (6) one by one. The expansion tube assembly (6) passes through the protective sleeve (41). The protective sleeve (41) is provided to prevent expansion of the copper tube inlet of the heat exchanger. The tube pinching sealing assembly (7) includes a plurality of rubber plug sleeves (75) and a second driving mechanism for driving the rubber plug sleeves (75) to rotate. The movable positioning frame (4) is provided with a plurality of "trumpet-shaped" positioning holes (42) corresponding to the rubber plug sleeves (75) one by one. The lower end of the rubber plug sleeve (75) is threadedly connected to the "trumpet-shaped" positioning hole (42). The expansion tube assembly (6) passes through the rubber plug sleeve (75) and the protective sleeve (41) in sequence. The rubber plug sleeve (75) is driven to rotate by the second driving mechanism. The second drive mechanism comprises a second drive motor (71) arranged on the movable positioning frame (4), and movable parallel rods (72) arranged in parallel on both sides of the second drive motor (71); the output end of the second drive motor (71) is connected to a main transmission rod (73), and the two ends of the main transmission rod (73) are respectively hingedly connected to the movable parallel rods (72) on both sides; each rubber plug sleeve (75) is connected to a slave transmission rod (74), and the two ends of the slave transmission rod (74) are respectively hingedly connected to the movable parallel rods (72) on both sides.

2. A heat exchanger hydraulic tube expansion device according to claim 1, characterized in that: The frame body (1) comprises a bottom platform (11), guide rail columns (12) on both sides and a top frame (13).

3. The heat exchanger hydraulic tube expansion device according to claim 1, characterized in that: The upper end of the hard water pipe (61) is fixedly connected to the movable main frame (2) via a bolt (63); the upper end of the hard water pipe (61) is provided with a threaded portion that cooperates with the bolt (63); and the bolt (63) is located at the upper end of the movable main frame (2).

4. The heat exchanger hydraulic tube expansion device according to claim 1, characterized in that: The two ends of the expansion tube assembly (6) are respectively sealed and locked by locking nuts (64), and the two ends of the hard water pipe (61) are respectively provided with threaded parts that cooperate with the locking nuts (64).

5. A heat exchanger hydraulic tube expansion device according to any one of claims 1 to 4, characterized in that: A guide member (65) is provided at the lower end of the tube expansion assembly (6) to facilitate the passage of the tube expansion assembly (6) into the heat exchanger and to guide it.

6. A heat exchanger hydraulic tube expansion device according to claim 5, characterized in that: The guide member (65) is a conical guide head.

7. A tube expansion control method for a tube expansion device, characterized in that: The tube expansion control method comprises the following steps: the movable main frame (2) and the movable positioning frame (4) are in the initial position, the heat exchanger (8) is fixed on the bottom platform (11) below, the system is set according to the length of the copper tube (9) of the heat exchanger (8), the movable main frame (2) is driven down by the main driving mechanism, the lower end of the tube expansion assembly (6) enters the copper tube (9) inlet under the guidance of the guide (65), and after reaching the set position, the movable main frame (2) stops moving; The movable positioning frame (4) is driven downward by the first driving mechanism, the protective sleeve (41) is completely inserted into the upper end of the copper tube, and the movable positioning frame (4) stops moving; The second driving mechanism drives the rubber plug sleeve (75) to rotate, pinching and sealing the expansion tube (62) at this location, thereby preventing the expansion tube assembly (6) at this location from being filled with water and expanding the tube; The high-pressure water pump is started to pressurize and expand the tube. After the tube expansion is completed, the pressure is released, and the water is partially discharged from the tube expansion assembly (6). The second driving mechanism drives the rubber plug sleeve (75) to reverse, and the rubber plug sleeve (75) is loosened. The movable main frame (2) and the movable positioning frame (4) rise to the initial position, and the tube expansion operation of the next heat exchanger is carried out; During the tube expansion process, pressure and water volume control are required. The amount of water supplied is calculated as follows: The outer diameter D1 and wall thickness δ1 of the copper tube (9) before expansion and the required outer diameter D2 of the copper tube (9) after expansion are three parameters, and the density change of the copper tube (9) is ignored. The calculation formula for calculating the wall thickness δ2 of the copper tube (9) after expansion is as follows: Because they are all numerical calculations, the letter δ2 can be directly used to represent the wall thickness of the copper tube after expansion, and the calculation formula will no longer be converted; The water requirement Q for expansion of a single copper tube (9) with an expansion length of L is calculated as follows: in D 2, δ 2, L is a known value, and C is the volume occupied by the expansion tube (62) and the water supply conduit per unit length.

Images