Heat exchanger tube expansion device and method

Abstract

The invention provides a heat exchanger tube expanding device and method. The heat exchanger tube expanding device comprises a workbench, a tube expanding pressure applying assembly, a clamping assembly and a tube expanding moving assembly, wherein the tube expanding pressure applying assembly, the clamping assembly and the tube expanding moving assembly are arranged on the workbench. The tube expansion pressure applying assembly comprises a tube expansion head and is used for driving the tube expansion head to be inserted into a heat exchange tube for tube expansion; the clamping assembly is used for clamping and fixing the heat exchanger in the tube expansion process; and the tube expansion moving assembly is used for being matched with the clamping assembly to clamp and fix the heat exchanger, and in the tube expansion process, a self-adaptive moving space for releasing the shrinkage stress of the heat exchange tube can be provided for the heat exchanger. The pipe expansion moving assembly can be matched with the clamping assembly to clamp and fix the heat exchanger, and in the process that the pipe expansion head is inserted into the heat exchange pipe for pipe expansion, a self-adaptive moving space for releasing stress can be provided for the heat exchanger, so that the inner cavity can move in a self-adaptive mode to release shrinkage stress of the expanded heat exchange pipe.

Description

Technical Field

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

[0002] In the field of heat exchanger manufacturing, tube expansion technology is a key process link, mainly used to strengthen the connection tightness between copper tubes and fins. The existing technology usually implements tube expansion by the following steps: fix the product containing multiple copper tubes and fin assemblies in a fixture, and push the expansion head with a diameter slightly larger than the inner diameter of the copper tube along the inside of the copper tube through a pressure mechanism. In this process, the expansion head applies radial extrusion force to the inner wall of the copper tube, forcing the copper tube to undergo plastic deformation to expand the tube diameter, thereby achieving a close fit between the copper tube and the fin.

[0003] However, the prior art has significant technical defects. Specifically, in order to ensure that the ends of multiple copper tubes are flush after expansion, the tailstock of the fixture is usually designed as a rigid fixed structure. During the expansion process, the copper tube is squeezed by the expansion head to produce a natural axial shrinkage trend, but because the tailstock cannot move, the shrinkage of the copper tube cannot be effectively released. This constraint causes the inner cavity end face of the copper tube end connection to be subjected to abnormal tensile stress, which in turn causes plastic deformation problems such as end face depression and distortion. Such deformation will not only weaken the tightness of the connection between the tube end and the adjacent components, but may also reduce the overall structural strength and durability of the heat exchanger, while causing a decrease in product qualification rate and subsequent assembly difficulties, seriously restricting production efficiency and product quality.

[0004] This technical bottleneck has long existed in industry practice, and there is an urgent need for a solution that can overcome the deformation defects caused by existing rigid fixtures. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a heat exchanger tube expansion device and method to solve the problem that the existing rigid clamps cause deformation defects after the heat exchanger tubes are expanded.

[0006] In order to solve the above technical problems, the technical solution used in the present invention is:

[0007] The heat exchanger tube expansion device of the present invention comprises a cavity and a heat exchange tube connected to the cavity, and the device comprises: a workbench and a tube expansion pressure component, a clamping component and a tube expansion moving component arranged on the workbench;

[0008] The tube expansion pressure component includes a tube expansion head, and the tube expansion pressure component is used to drive the tube expansion head to insert into the heat exchange tube to expand the tube;

[0009] The clamping assembly is used to clamp the heat exchanger during the tube expansion process of the tube expansion and pressure application assembly;

[0010] The tube expansion moving assembly is used to cooperate with the clamping assembly to implement the clamping of the heat exchanger, and when the tube expansion head is inserted into the heat exchange tube for tube expansion, it can provide the heat exchanger with an adaptive moving space for releasing the shrinkage stress of the heat exchange tube.

[0011] Preferably, the tube expansion pressure assembly and the tube expansion moving assembly are spaced apart, and a storage space for accommodating the heat exchanger is provided therebetween; after the heat exchanger is placed in the storage space, the tube expansion pressure assembly and the tube expansion moving assembly are respectively located at both ends of the axial direction of the heat exchange tube, and the clamping assembly is used to clamp the side of the heat exchanger.

[0012] Preferably, the tube expansion moving assembly comprises a tailstock and a tailstock driving mechanism, the tailstock driving mechanism is provided with an output shaft, and the other end of the output shaft is movably connected to one side of the tailstock;

[0013] The other side of the tailstock can abut against the end of the heat exchange tube after the tailstock driving mechanism drives the output shaft to extend, and after the tailstock driving mechanism drives the output shaft to retract, the tailstock has a degree of freedom of movement that is not less than a preset distance.

[0014] Further preferably, the tailstock comprises a main body and a contoured mold body, one side of the contoured mold body is connected to the main body, and the other side is provided with a slot matching the end of the heat exchange tube;

[0015] When the tail seat abuts against the end of the heat exchange tube, the end of the heat exchange tube is inserted into the clamping groove.

[0016] Further preferably, the tailstock drive mechanism comprises a first hydraulic drive cylinder, the first hydraulic drive cylinder is provided with a first output cylinder rod, the other end of the first output cylinder rod is inserted into the tailstock and movably connected with the tailstock, and the first output cylinder rod has a telescopic freedom along its axial direction within the tailstock that is not less than the preset distance;

[0017] The workbench is provided with a first slide rail, the tailstock is slidably connected to the first slide rail, and the first output cylinder rod can drive the tailstock to slide back and forth along the first slide rail.

[0018] More preferably, the tailstock drive mechanism further comprises a second hydraulic drive cylinder, the second hydraulic drive cylinder is provided with a second output cylinder rod, and the second output cylinder rod and the first output cylinder rod are located on the same side of the tailstock;

[0019] The second hydraulic drive cylinder can drive the second output cylinder rod to extend so that the other end of the second output cylinder rod abuts against the side surface of the tailstock.

[0020] Further preferably, the tailstock drive mechanism comprises a servo motor, the servo motor is provided with a servo drive shaft, the other end of the servo drive shaft is inserted into the tailstock and movably connected with the tailstock, and the servo drive shaft has a telescopic freedom along its axial direction within the tailstock that is not less than the preset distance;

[0021] The workbench is provided with a first slide rail, the tailstock is slidably connected to the first slide rail, and the servo drive shaft can drive the tailstock to slide back and forth along the first slide rail;

[0022] And / or, the tailstock is provided with a connecting block facing the output shaft, the connecting block is provided with a through hole, a joint is slidably provided in the through hole, one end of the joint is connected to the other end of the output shaft, the other end of the joint is provided with a convex shoulder along its circumference, the inner wall of the through hole is provided with a clamping portion matching the convex shoulder, and a gap of not less than the preset distance exists between the clamping portion and the convex shoulder;

[0023] The boss can be engaged with the clamping portion after the output shaft is retracted.

[0024] Preferably, the clamping assembly includes a first side pressure cylinder, the first side pressure cylinder and the tube expansion moving assembly are respectively located on the front and rear sides of the storage space, the first side pressure cylinder and the tube expansion pressure assembly are located on the same side of the storage space and are connected to the tube expansion pressure assembly.

[0025] Further preferably, the clamping assembly further includes a second side pressure cylinder and a third side pressure cylinder, the second side pressure cylinder and the third side pressure cylinder are both connected to the workbench and are respectively located on the left and right sides of the storage space.

[0026] Another object of the present invention is to provide a method for expanding a heat exchanger tube, based on the above-mentioned heat exchanger tube expansion device, comprising:

[0027] After placing the heat exchanger to be expanded between the expansion and pressure-applying assembly and the expansion and moving assembly, the heat exchanger is clamped by using the expansion and moving assembly and the clamping assembly;

[0028] The heat exchanger is expanded by using the expansion and pressure assembly. After the expansion head is inserted into the heat exchange tube, the expansion movement assembly is adjusted so that the cavity of the heat exchanger can move in the adaptive movement space.

[0029] Compared with the prior art, the beneficial effects of the heat exchanger tube expansion device described in the present invention are mainly reflected in:

[0030] The device of the present invention can ensure the radial stability of the heat exchanger during the tube expansion process by arranging the clamping component; by arranging the tube expansion moving component, on the one hand, it can cooperate with the clamping component to clamp the heat exchanger to ensure the axial and radial stability of the heat exchanger when the tube expansion head is inserted into the heat exchange tube; on the other hand, when the tube expansion head is inserted into the heat exchange tube for tube expansion, it can provide the heat exchanger with an adaptive moving space for releasing stress, so that the cavity can adaptively move to release the contraction stress of the heat exchange tube after the tube expansion, thereby avoiding the end face of the cavity connected to the end of the heat exchange tube from being subjected to abnormal tensile stress, which causes plastic deformation problems such as end face depression and distortion, can overcome the deformation defects caused by existing rigid clamps, and improve the product consistency and quality of the heat exchanger after tube expansion.

[0031] Compared with the prior art, the heat exchanger expansion method described in the present invention is based on the above-mentioned heat exchanger expansion device, has the beneficial effects of the above-mentioned heat exchanger expansion device, is simple to operate, and can be repeatedly operated to meet the needs of batch expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other purposes, features and advantages of the present invention will become more clear by more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

[0033] Figure 1 A three-dimensional structure of a heat exchanger expansion device provided in an embodiment of the present invention Figure 1 ;

[0034] Figure 2 for Figure 1 A top view of

[0035] Figure 3 for Figure 1 A front view of

[0036] Figure 4 for Figure 2 A node graph in;

[0037] Figure 5 A three-dimensional structure of a heat exchanger expansion device provided in an embodiment of the present invention Figure 2 ; Description of the drawings:

[0039] Workbench 100;

[0040] The tube expansion pressure assembly 200, the tube expansion head 201, the third hydraulic drive cylinder 202, the third output cylinder rod 203, the second slide rail 204, the mounting seat 205, and the tube expansion rod 206;

[0041] Clamping assembly 300, first side pressure cylinder 301, second side pressure cylinder 302, third side pressure cylinder 303;

[0042] The expansion tube moving assembly 400, the tailstock 410, the main body 401, the contour mold body 402, the slot 403, the connecting block 404, the joint 405, the boss 406, the clamping part 407, the gap 408; the first hydraulic drive cylinder 420, the first output cylinder rod 421; the first slide rail 430; the second hydraulic drive cylinder 440, the second output cylinder rod 441;

[0043] Heat exchanger 500 , cavity 510 , heat exchange tube 520 . DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments cited are not intended to limit the present invention. In the present embodiment, it should be understood that the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0045] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used in the present invention are for illustrative purposes only.

[0046] This embodiment provides a heat exchanger 500 expansion device, such as Figures 1 to 5 As shown, it includes a workbench 100 and a tube expansion pressure assembly 200, a clamping assembly 300 and a tube expansion moving assembly 400 arranged on the workbench 100, and a heat exchanger 500 includes a cavity 510 and a heat exchange tube 520 connected to the cavity 510;

[0047] The tube expansion pressure component 200 includes a tube expansion head 201, and the tube expansion pressure component 200 is used to drive the tube expansion head 201 to insert into the heat exchange tube 520 to expand the tube;

[0048] The clamping assembly 300 is used to clamp the heat exchanger 500 during the tube expansion process of the tube expansion and pressure application assembly 200;

[0049] The tube expansion moving assembly 400 is used to cooperate with the clamping assembly 300 to clamp the heat exchanger 500, and the tube expansion moving assembly 400 can provide the heat exchanger 500 with an adaptive moving space to release the shrinkage stress of the heat exchange tube 520 during the tube expansion process when the tube expansion head 201 is inserted into the heat exchange tube 520.

[0050] The device of this embodiment can ensure the radial stability of the heat exchanger 500 during the expansion process by providing the clamping component 300; by providing the expansion moving component 400, on the one hand, it can cooperate with the clamping component 300 to clamp the heat exchanger 500 to ensure the axial and radial stability of the heat exchanger 500 when the expansion head 201 is inserted into the heat exchange tube 520; on the other hand, when the expansion head 201 is inserted into the heat exchange tube 520 for expansion, it can provide the heat exchanger 500 with an adaptive moving space for releasing stress, so that the cavity 510 can adaptively move to release the contraction stress of the heat exchange tube 520 after the expansion, thereby avoiding the end face of the cavity 510 connected to the end of the heat exchange tube 520 from being subjected to abnormal tensile stress, which causes plastic deformation problems such as end face depression and distortion, can overcome the deformation defects caused by existing rigid clamps, and improve the product consistency and quality of the heat exchanger 500 after expansion.

[0051] In a preferred embodiment, the tube expansion pressure assembly 200 and the tube expansion moving assembly 400 are arranged at intervals, and a storage space for accommodating the heat exchanger 500 is provided between the two. After the heat exchanger 500 is placed in the storage space, the tube expansion pressure assembly 200 and the tube expansion moving assembly 400 are respectively located at the two ends of the axial direction of the heat exchange tube 520, and the clamping assembly 300 is used to clamp the side of the heat exchanger 500.

[0052] like Figures 1 to 3 As shown, the tube expansion pressure assembly 200 also includes a third hydraulic drive cylinder 202, an expansion rod 206 and a mounting seat 205 thereof. The third hydraulic drive cylinder 202 is provided with a third output lever 203, and the other end of the third output lever 203 is connected to the mounting seat 205. One end of the expansion rod 206 is connected to the mounting seat 205, and the other end is provided with an expansion head 201. A second slide rail 204 is provided at the bottom of the mounting seat 205 and is slidably connected to the second slide rail 204. The third hydraulic drive cylinder 202 and the second slide rail 204 are respectively fixed to the surface of the workbench 100; the third output lever 203 is driven to extend and retract by the third hydraulic drive cylinder 202, so that the mounting seat 205 can be driven to slide back and forth on the second slide rail 204, and the tube is expanded and retracted accordingly.

[0053] Usually, the cavity 510 of the heat exchanger 500 is square, and the heat exchange tube 520 extends from one side of the cavity 510 to the other side, and a tube port is left for the expansion head 201 to enter. In a further preferred embodiment, the clamping assembly 300 includes a first side pressure cylinder 301, and the first side pressure cylinder 301 and the expansion tube moving assembly 400 are respectively located at the front and rear sides of the storage space, and the first side pressure cylinder 301 and the expansion tube pressure assembly 200 are located on the same side of the storage space and connected to the expansion tube pressure assembly 200; this embodiment can clamp the axial direction of the heat exchanger 500 to be expanded through the cooperation of the first side pressure cylinder 301 and the expansion tube moving assembly 400, so as to ensure the stability of the heat exchanger 500 when the expansion head 201 is inserted into the heat exchange tube 520.

[0054] Furthermore, the clamping assembly 300 also includes a second side pressure cylinder 302 and a third side pressure cylinder 303. The second side pressure cylinder 302 and the third side pressure cylinder 303 are both connected to the workbench 100 and are respectively located on the left and right sides of the storage space. Through the cooperation of the second side pressure cylinder 302 and the third side pressure cylinder 303, the radial direction of the heat exchanger 500 to be expanded can be clamped, thereby improving the operating stability and expansion quality of the expansion device during the expansion process.

[0055] The above-mentioned axial and radial directions refer to the axial and radial directions of the heat exchange tube 520 to be expanded; wherein, the second side pressure cylinder 302 and the third side pressure cylinder 303 are preferably detachably connected to the workbench 100 so as to adjust the storage space according to different sizes of cavities 510. Similarly, the expansion pressure assembly 200 is preferably detachably connected to the workbench 100. When adjusting the position of the expansion pressure assembly 200, the position of the first side pressure cylinder 301 can be adjusted accordingly. The first side pressure cylinder 301 is preferably detachably connected to the expansion pressure assembly 200 for easy disassembly and maintenance.

[0056] In another preferred embodiment, Figure 2 As shown, the expansion tube moving assembly 400 includes a tailstock 410 and a tailstock driving mechanism, the tailstock driving mechanism is provided with an output shaft, and the other end of the output shaft is movably connected to one side of the tailstock 410; the other side of the tailstock 410 can abut against the end of the heat exchange tube 520 after the tailstock driving mechanism drives the output shaft to extend, and after the tailstock driving mechanism drives the output shaft to retract, the tailstock 410 has a degree of freedom of movement that is not less than a preset distance. It should be noted that the movable connection in the embodiment means that after the output shaft and the tailstock 410 are connected, the tailstock 410 can move along the axial direction of the heat exchange tube 520 to be expanded after receiving an external thrust; the preset distance varies depending on the length or contraction amount of the heat exchange tube 520 to be expanded, and the size of the preset distance should at least be able to meet the cavity 510 to fully release the contraction stress of the heat exchange tube 520 after the expansion.

[0057] In a further preferred embodiment, Figure 4As shown, the tailstock 410 is provided with a connecting block 404 facing the output shaft, the connecting block 404 is provided with a through hole, a joint 405 is slidably provided in the through hole, one end of the joint 405 is connected to the other end of the output shaft, the other end of the joint 405 is provided with a shoulder 406 along its circumference, and a clamping portion 407 matching the shoulder 406 is provided on the inner wall of the through hole, and a gap 408 not less than a preset distance is provided between the clamping portion 407 and the shoulder 406; the shoulder 406 can be clamped with the clamping portion 407 after the output shaft retracts. In this embodiment, the gap 408 between the clamping portion 407 and the boss 406 is the movement amount of the tail stock 410 back movement; the clamping mode of the boss 406 and the clamping portion 407 can ensure that the expansion tube is completed, and the tail stock 410 is driven to move back in time by the retraction of the output shaft; wherein, the connecting block 404 is preferably detachably connected to the tail stock 410, and the joint 405 is preferably detachably connected to the output shaft. When installing this embodiment, the connecting block 404 is first sleeved on the outer periphery of the joint 405, and then the joint 405 is sleeved on the end of the output shaft, and finally the connecting block 404 is screwed to the tail stock 410 and the joint 405 is screwed to the output shaft, which is simple and convenient, and also reduces the difficulty and cost of production.

[0058] In another preferred embodiment, Figure 5 As shown, the tailstock 410 includes a main body 401 and a profiling die 402. One side of the profiling die 402 is connected to the main body 401, and the other side is provided with a slot 403 matching the end of the heat exchange tube 520. When the tailstock 410 abuts against the end of the heat exchange tube 520, the end of the heat exchange tube 520 is inserted into the slot 403. Usually, the heat exchange tube 520 is a U-shaped tube, and the tube end close to the tailstock driving mechanism is a curved U-shape. In this embodiment, by providing the slot 403 matching the end of the heat exchange tube 520, the end of the heat exchange tube 520 can be inserted into the slot 403, thereby increasing the abutment area between the tailstock 410 and the heat exchange tube 520, ensuring the stability when the tailstock 410 abuts against the end of the heat exchange tube 520, and improving the quality of the expansion tube. Among them, the main body 401 and the profiling die 402 can be an integrated structure, or a split structure that is more convenient to manufacture.

[0059] In another preferred embodiment, Figure 2 and Figure 3As shown, the tailstock driving mechanism includes a first hydraulic driving cylinder 420, and the first hydraulic driving cylinder 420 is provided with a first output cylinder rod 421. The other end of the first output cylinder rod 421 is inserted into the tailstock 410 and movably connected with the tailstock 410, and the first output cylinder rod 421 has a telescopic freedom along its axial direction of not less than a preset distance in the tailstock 410, that is, when the tailstock 410 does not move, the first output cylinder rod 421 has a telescopic freedom along its axial direction of not less than a preset distance in the tailstock 410; the workbench 100 is provided with a first slide rail 430, and the tailstock 410 is slidably connected to the first slide rail 430, and the first output cylinder rod 421 can drive the tailstock 410 to slide back and forth along the first slide rail 430.

[0060] In this embodiment, by setting the first slide rail 430, the moving direction of the tailstock 410 can be limited to ensure the directional stability of the tailstock 410. When in use, the first hydraulic drive cylinder 420 drives the first output cylinder rod 421 to extend and push the tailstock 410 toward the heat exchange tube 520 to be expanded and abut against the end of the heat exchange tube 520. After the expansion head 201 is inserted into the heat exchange tube 520, the first output cylinder rod 421 is driven to retract, and the retraction distance is not less than the preset distance. In this way, the tailstock 410 can have a return space not less than the preset distance. After the tailstock 410 is subjected to the thrust stress from the cavity 510 side, it can adaptively move back to meet the need of the cavity 510 to fully release the contraction stress of the heat exchange tube 520. In a specific embodiment, when the axial length of the U-shaped heat exchange tube 520 is in the range of 200mm to 230mm, the required preset distance can be set to about 2mm.

[0061] Since the precision control of the driving process of the hydraulic drive cylinder is not ideal when facing a small distance, in a further preferred embodiment, the tailstock drive mechanism also includes a second hydraulic drive cylinder 440, and the second hydraulic drive cylinder 440 is provided with a second output cylinder rod 441, and the second output cylinder rod 441 and the first output cylinder rod 421 are located on the same side of the tailstock 410; the second hydraulic drive cylinder 440 can drive the second output cylinder rod 441 to extend so that the other end thereof abuts against the side of the tailstock 410. In this embodiment, the first hydraulic drive cylinder 420 can be used to drive the first output cylinder rod 421 to extend and push the tailstock 410 toward the heat exchange tube 520 to be expanded and fit with the end of the heat exchange tube 520. At this time, the first output cylinder rod 421 has a telescopic freedom of not less than a preset distance along its axial direction in the tailstock 410, that is, when the tailstock 410 does not move, the first output cylinder rod 421 can retract into a space not less than a preset distance (or the tailstock 410 has a moving space not less than a preset distance toward the cavity 510); then the second hydraulic drive cylinder 440 drives the second output cylinder rod 441 to extend and push the tailstock 410 toward the cavity 510, and the displacement is not less than a preset distance, which is usually set to the stress release space required by the cavity 510. At this time, the tailstock 410 will push the heat exchanger 500 to be expanded to move slightly at the same time; then, the clamping The assembly 300 clamps the heat exchanger 500 to be expanded, and then the expansion pressure assembly 200 is used to drive the expansion head 201 to insert into the heat exchange tube 520 for expansion. After the expansion head 201 is inserted into the heat exchange tube 520, in this embodiment, the second hydraulic drive cylinder 440 can be controlled to drive the second output cylinder rod 441 to retract about 10 mm after the expansion head 201 is inserted into the heat exchange tube 520. At this time, the tail stock 410 can move back under the push of the cavity 510. Since the aforementioned displacement is not less than the preset distance, the tail stock 410 has a return displacement of not less than the preset distance, thereby meeting the stress release space required by the cavity 510 and avoiding deformation of the cavity 510. After the expansion is completed, the first hydraulic drive cylinder 420, the second hydraulic drive cylinder 440 and the clamping assembly 300 are further controlled to retract to provide an operating space for removing the heat exchanger 500.

[0062] As another preferred embodiment, the tailstock drive mechanism includes a servo motor (not shown in the figure), the servo motor is provided with a servo drive shaft (not shown in the figure), the other end of the servo drive shaft is inserted into the tailstock 410 and movably connected with the tailstock 410, and the servo drive shaft has a telescopic freedom of not less than a preset distance along its axial direction in the tailstock 410; the workbench 100 is provided with a first slide rail 430, the tailstock 410 is slidably connected with the first slide rail 430, and the servo drive shaft can drive the tailstock 410 to slide back and forth along the first slide rail 430. The working principle and method of this embodiment are the same as those of the embodiment in which only the first hydraulic drive cylinder 420 is provided. Compared with the hydraulic drive method, the servo motor in this embodiment can accurately control the progress of the servo drive shaft, and then can ensure the retraction amount of the servo drive shaft when facing a smaller retraction process, and ensure the required return amount of the tailstock 410.

[0063] In addition, based on the above-mentioned heat exchanger 500 tube expansion device, a heat exchanger 500 tube expansion method is also provided, including:

[0064] After the heat exchanger 500 to be expanded is placed between the expansion and pressure assembly 200 and the expansion moving assembly 400, i.e., the storage space in the above embodiment, the heat exchanger 500 is clamped by the expansion moving assembly 400 and the clamping assembly 300;

[0065] Then, the heat exchanger 500 is expanded by using the expansion pressure assembly 200. After the expansion head 201 is inserted into the heat exchange tube 520, the expansion moving assembly 400 is adjusted so that the cavity 510 of the heat exchanger 500 can move in the adaptive moving space. It should be noted that the expansion moving assembly 400 is usually adjusted after the expansion head 201 is inserted into the port of the heat exchange tube 520 for a certain distance. On the one hand, it is to ensure that the expansion head 201 is stably inserted into the heat exchange tube 520, and on the other hand, it is to wait for the shrinkage stress of the heat exchange tube 520 to reach the moment when the cavity 510 is plastically deformed.

[0066] A tube expansion method for a heat exchanger 500 of the present invention is based on the above-mentioned tube expansion device for the heat exchanger 500, has the beneficial effects of the above-mentioned tube expansion device for the heat exchanger 500, is simple to operate, and can be repeatedly operated to meet the needs of batch tube expansion.

[0067] In this specification, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A heat exchanger tube expansion device, the heat exchanger comprising a cavity and a heat exchange tube connected to the cavity, characterized in that: It comprises a workbench and a tube expansion pressure component, a clamping component and a tube expansion moving component arranged on the workbench; The tube expansion pressure component includes a tube expansion head, and the tube expansion pressure component is used to drive the tube expansion head to insert into the heat exchange tube to expand the tube; The clamping assembly is used to clamp the heat exchanger during the tube expansion process of the tube expansion and pressure application assembly; The tube expansion moving assembly is used to cooperate with the clamping assembly to implement the clamping of the heat exchanger, and when the tube expansion head is inserted into the heat exchange tube for tube expansion, it can provide the heat exchanger with an adaptive moving space for releasing the shrinkage stress of the heat exchange tube.

2. A heat exchanger tube expansion device according to claim 1, characterized in that: The tube expansion pressure assembly and the tube expansion moving assembly are arranged at intervals, and a storage space for accommodating the heat exchanger is arranged between the two. After the heat exchanger is placed in the storage space, the tube expansion pressure assembly and the tube expansion moving assembly are respectively located at the two ends of the axial direction of the heat exchange tube, and the clamping assembly is used to clamp the side of the heat exchanger.

3. A heat exchanger tube expansion device according to claim 1, characterized in that: The tube expansion moving assembly comprises a tailstock and a tailstock driving mechanism, wherein the tailstock driving mechanism is provided with an output shaft, and the other end of the output shaft is movably connected to one side of the tailstock; The other side of the tailstock can abut against the end of the heat exchange tube after the tailstock driving mechanism drives the output shaft to extend, and after the tailstock driving mechanism drives the output shaft to retract, the tailstock has a degree of freedom of movement that is not less than a preset distance.

4. A heat exchanger tube expansion device according to claim 3, characterized in that: The tailstock comprises a main body and a contoured mold body, one side of the contoured mold body is connected to the main body, and the other side is provided with a slot matching the end of the heat exchange tube; When the tail seat abuts against the end of the heat exchange tube, the end of the heat exchange tube is inserted into the clamping groove.

5. A heat exchanger tube expansion device according to claim 3, characterized in that: The tailstock drive mechanism comprises a first hydraulic drive cylinder, the first hydraulic drive cylinder is provided with a first output cylinder rod, the other end of the first output cylinder rod is inserted into the tailstock and movably connected with the tailstock, and the first output cylinder rod has a telescopic freedom along its axial direction within the tailstock that is not less than the preset distance; The workbench is provided with a first slide rail, the tailstock is slidably connected to the first slide rail, and the first output cylinder rod can drive the tailstock to slide back and forth along the first slide rail.

6. A heat exchanger tube expansion device according to claim 5, characterized in that: The tailstock drive mechanism further comprises a second hydraulic drive cylinder, the second hydraulic drive cylinder is provided with a second output cylinder rod, and the second output cylinder rod and the first output cylinder rod are located on the same side of the tailstock; The second hydraulic drive cylinder can drive the second output cylinder rod to extend so that the other end of the second output cylinder rod abuts against the side surface of the tailstock.

7. A heat exchanger tube expansion device according to claim 3, characterized in that: The tailstock drive mechanism comprises a servo motor, the servo motor is provided with a servo drive shaft, the other end of the servo drive shaft is inserted into the tailstock and movably connected with the tailstock, and the servo drive shaft has a telescopic freedom along its axial direction within the tailstock that is not less than the preset distance; The workbench is provided with a first slide rail, the tailstock is slidably connected to the first slide rail, and the servo drive shaft can drive the tailstock to slide back and forth along the first slide rail; And / or, the tailstock is provided with a connecting block facing the output shaft, the connecting block is provided with a through hole, a joint is slidably provided in the through hole, one end of the joint is connected to the other end of the output shaft, the other end of the joint is provided with a convex shoulder along its circumference, the inner wall of the through hole is provided with a clamping portion matching the convex shoulder, and a gap of not less than the preset distance exists between the clamping portion and the convex shoulder; The boss can be engaged with the clamping portion after the output shaft is retracted.

8. A heat exchanger tube expansion device according to claim 2, characterized in that: The clamping assembly includes a first side pressure cylinder, the first side pressure cylinder and the tube expansion moving assembly are respectively located on the front and rear sides of the storage space, the first side pressure cylinder and the tube expansion pressure assembly are located on the same side of the storage space and are connected to the tube expansion pressure assembly.

9. A heat exchanger tube expansion device according to claim 8, characterized in that: The clamping assembly also includes a second side pressure cylinder and a third side pressure cylinder. The second side pressure cylinder and the third side pressure cylinder are both connected to the workbench and are respectively located on the left and right sides of the storage space.

10. A tube expansion method for a heat exchanger, based on a tube expansion device for a heat exchanger according to any one of claims 1 to 9, characterized in that: include: After placing the heat exchanger to be expanded between the expansion and pressure-applying assembly and the expansion and moving assembly, the heat exchanger is clamped by using the expansion and moving assembly and the clamping assembly; The heat exchanger is expanded by using the expansion and pressure assembly. After the expansion head is inserted into the heat exchange tube, the expansion movement assembly is adjusted so that the cavity of the heat exchanger can move in the adaptive movement space.

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