CN113634672A

CN113634672A - Bidirectional device for expanding and jointing copper pipes in heat absorption plate core of solar water heater

Info

Publication number: CN113634672A
Application number: CN202110884634.8A
Authority: CN
Inventors: 周崇炎
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-11-12

Abstract

The invention relates to the field of solar water heaters, in particular to a bidirectional device for expanding and jointing a copper pipe in a heat absorption plate core of a solar water heater. The technical problem is as follows: the device for expanding and jointing the copper pipes in the heat absorption plate core of the solar water heater in a bidirectional mode is provided. The technical scheme is as follows: a bidirectional device for expanding and jointing copper pipes in a heat absorption plate core of a solar water heater comprises an expansion unit, an anti-bending unit and the like; expansion units which can expand the simulated metal heat absorption pipe and are tightly attached to the inner wall of the simulated aluminum fin pipe are arranged at the two ends above the fixing frame; the expansion unit is provided with an anti-bending unit which can prevent the simulation metal heat absorption pipe from bending when expanding. The invention realizes that the bidirectional expansion fitting method is adopted, so that the production efficiency is accelerated, the copper pipe can be effectively prevented from being bent under the action of stress, the expansion fitting of the copper pipe is ensured to be tight, the quality of the heat absorbing plate core is ensured, and the service life of the water heater is prolonged.

Description

Bidirectional device for expanding and jointing copper pipes in heat absorption plate core of solar water heater

Technical Field

The invention relates to the field of solar water heaters, in particular to a bidirectional device for expanding and jointing a copper pipe in a heat absorption plate core of a solar water heater.

Background

The prior art provides a production process of a heat absorption plate core of a solar water heater, wherein a copper pipe with a diameter slightly smaller than that of an aluminum fin pipe is required to be expanded and attached to the inner wall of the aluminum fin pipe, in the process, the copper pipe is required to be horizontally fixed inside the aluminum fin pipe, then the copper pipe is expanded and attached to the inner wall of the aluminum fin pipe through an expander, but in the process of expanding and attaching the copper pipe, the copper pipe has certain deformation capacity, and the copper pipe generates certain stress when expanding and attaching, so that the problem that the part of the copper pipe which is not expanded and attached is bent is easy to occur, namely the copper pipe at the bent part cannot be tightly attached to the inner wall of the aluminum fin pipe, thereby prolonging the service life of the water heater, and the prior art adopts unidirectional expansion, the process greatly increases the difficulty of fixing the copper pipe, and is difficult to prevent the copper pipe from being bent due to the stress, the quality of the heat absorption plate core does not reach the standard, so that the quality of the water heater is reduced.

Therefore, the expansion and lamination equipment for the bidirectional copper pipe is provided, and the bidirectional expansion and lamination method is adopted, so that the production efficiency is improved, meanwhile, the copper pipe can be effectively prevented from being bent under the stress action, the expansion and lamination of the copper pipe are ensured to be tight, and the service life of the water heater is prolonged.

Disclosure of Invention

In order to overcome at the in-process of copper pipe expansion laminating, because the copper pipe itself has certain deformability, and the copper pipe can produce certain stress when the expansion laminating, make the copper pipe not expand the problem of laminating the position and taking place to buckle easily, the position copper pipe that takes place to buckle promptly can not closely laminate the inner wall to the aluminium fin pipe, thereby reduce the life of water heater, and what prior art adopted is one-way expansion, this process greatly increased the fixed degree of difficulty of copper pipe, and be difficult to prevent that the copper pipe from buckling because stress takes place, lead to the heat absorption plate core quality not up to standard, thereby make the shortcoming of water heater quality decline, the technical problem: the device for expanding and jointing the copper pipes in the heat absorption plate core of the solar water heater in a bidirectional mode is provided.

The technical scheme is as follows: a bidirectional device for expanding and attaching a copper pipe in a heat absorption plate core of a solar water heater comprises a fixing frame, a first vertical plate, a second vertical plate, a controller, a simulation aluminum fin pipe, a simulation metal heat absorption pipe, a first magnet, a second magnet, an expansion unit and an anti-bending unit; two sides above the fixing frame are fixedly connected with the first vertical plate and the second vertical plate respectively; the first vertical plate is fixedly connected with the controller; a simulated aluminum fin tube is arranged between the first vertical plate and the second vertical plate; a simulated metal heat absorption pipe is arranged in the simulated aluminum fin tube; a first magnet and a second magnet are arranged between the simulated aluminum fin tube and the simulated metal heat absorption tube; expansion units which can expand the simulated metal heat absorption pipe and are tightly attached to the inner wall of the simulated aluminum fin pipe are arranged at the two ends above the fixing frame; the expansion unit is provided with an anti-bending unit which can prevent the simulated metal heat absorption pipe from bending when expanding; the expansion unit is fixedly connected with the fixing frame; a first vertical plate is arranged on the front side of the expansion unit; the lower part of the bending prevention unit is connected with a fixing frame.

Optionally, the clamping and fixing device further comprises a clamping and fixing unit, wherein the clamping and fixing unit comprises a first electric push rod, a second electric push rod, a first arc-shaped clamping block, a third electric push rod, a fourth electric push rod and a second arc-shaped clamping block; the first electric push rod is fixedly connected with the second vertical plate; the first electric push rod is fixedly connected with the first arc-shaped clamping block; the first arc-shaped clamping block is fixedly connected with the second electric push rod; the second electric push rod is fixedly connected with the second vertical plate; a third electric push rod is arranged on the side surface of the first electric push rod; the third electric push rod is fixedly connected with the second vertical plate; the third electric push rod is fixedly connected with the second arc-shaped clamping block; the second arc-shaped clamping block is fixedly connected with the fourth electric push rod; the fourth electric push rod is fixedly connected with the second vertical plate; the first electric push rod, the second electric push rod, the first arc-shaped clamping block, the third electric push rod, the fourth electric push rod and the second arc-shaped clamping block are symmetrically arranged in groups on two sides of the simulated aluminum fin tube respectively; and the other group of the first electric push rod, the second electric push rod, the third electric push rod and the fourth electric push rod are fixedly connected with the first vertical plate.

Optionally, the expansion unit comprises a motor, a transmission shaft, a first bevel gear, a second bevel gear, a bidirectional reverse-thread lead screw, a first connecting plate, a first fixing plate, a polished rod, a second fixing plate, a U-shaped connecting plate, a fixing sleeve, a spline shaft, an L-shaped connecting plate, a third magnet, a first elastic expander, a second elastic expander, a third elastic expander, a fifth electric push rod, a sixth electric push rod, a seventh electric push rod, an eighth electric push rod, a ninth electric push rod and a tenth electric push rod; the motor is fixedly connected with the first vertical plate; the motor is fixedly connected with the transmission shaft through an output shaft; the transmission shaft is rotatably connected with the first vertical plate; the transmission shaft is fixedly connected with the first bevel gear; the first bevel gear is meshed with the second bevel gear; the second bevel gear is fixedly connected with the bidirectional reverse-thread screw rod; the bidirectional reverse-thread screw rod is connected with the first connecting plate in a screwing manner; the bidirectional reverse-thread screw rod is rotationally connected with the first fixing plate; the first connecting plate is in sliding connection with the polish rod; the first connecting plate is fixedly connected with the U-shaped connecting plate; the first connecting plate is fixedly connected with the fixed sleeve; the first fixing plate is fixedly connected with the fixing frame; the polish rod is fixedly connected with the second fixing plate; the second fixing plate is fixedly connected with the fixing frame; the U-shaped connecting plate is fixedly connected with the fixed sleeve; the fixed sleeve is fixedly connected with the spline shaft; the spline shaft is connected with an anti-bending unit; three groups of L-shaped connecting plates are arranged on the spline shaft in an annular array; one end of the spline shaft is fixedly connected with a fifth electric push rod, a sixth electric push rod, a seventh electric push rod, an eighth electric push rod, a ninth electric push rod and a tenth electric push rod at the same time; the three groups of L-shaped connecting plates are fixedly connected with the third magnet; the first elastic expander is simultaneously contacted with the second elastic expander and the third elastic expander; the first elastic expander is fixedly connected with the fifth electric push rod and the sixth electric push rod simultaneously; the second elastic expander is in contact with the third elastic expander; the second elastic expander is fixedly connected with the seventh electric push rod and the eighth electric push rod simultaneously; the third elastic expander is fixedly connected with the ninth electric push rod and the tenth electric push rod at the same time; the first connecting plate, the first fixing plate, the second fixing plate, the U-shaped connecting plate, the fixing sleeve, the spline shaft, the third magnet to the tenth electric push rod are symmetrically arranged in a group at two ends of the bidirectional reverse thread screw rod respectively; three groups of L-shaped connecting plates are arranged on the two groups of spline shafts in an annular array.

Optionally, the bending prevention unit comprises a connecting block, a connecting rope, a limiting column, a first pulley, a second pulley, a third pulley, an inner plate, a gap plate, a first expansion plate, a second connecting column, a first sliding sleeve, a first connecting rod, a first spring, a limiting ring, a second sliding sleeve, a second connecting rod, a second spring, a third connecting rod, a third spring, a first connecting column and a third connecting column; the connecting block is fixedly connected with one end of the spline shaft; the connecting block is fixedly connected with the connecting rope; the connecting rope is in sliding connection with the limiting column; the connecting rope is simultaneously in sliding connection with the first pulley, the second pulley and the third pulley; the connecting rope is fixedly connected with the inner plate; the limiting column is fixedly connected with the fixing frame; the first pulley is rotatably connected with the first connecting column; the second pulley is rotatably connected with the third connecting column; the third pulley is rotatably connected with the second connecting column; the inner plate is fixedly connected with the first expansion plate; the first expansion plate is fixedly connected with the gap plate; the first expansion plate is fixedly connected with the first sliding sleeve; the first sliding sleeve is in sliding connection with the spline shaft; the first sliding sleeve is simultaneously in sliding connection with the first connecting rod, the second connecting rod and the third connecting rod; the first sliding sleeve is fixedly connected with the first spring, the second spring and the third spring at the same time; the first connecting rod, the second connecting rod and the third connecting rod are fixedly connected with the limiting ring; the first spring, the second spring and the third spring are fixedly connected with the limiting ring; the limiting ring is fixedly connected with the second sliding sleeve; the second sliding sleeve is in sliding connection with the spline shaft; the connecting ropes, the first connecting column, the third connecting column and the second connecting column are arranged in three groups in an annular array by taking the central point of the first sliding sleeve as a base point; the connecting block, the first sliding sleeve and the third spring are symmetrically provided with one group on each of the two groups of spline shafts; three groups of connecting ropes, first connecting columns, third connecting columns and second connecting columns are arranged on the central points of the two groups of first sliding sleeves in an annular array mode.

Optionally, the two sets of the first elastic expanders, the second elastic expanders and the third elastic expanders are all expanding materials with certain elasticity, and the initial state is a contracted state.

Optionally, the first elastic expander, the second elastic expander and the third elastic expander just can expand the simulated metal heat absorption pipe after being completely expanded, and just can be tightly attached to the inner wall of the simulated aluminum fin pipe.

Optionally, the six groups of connecting ropes are in a relaxed state in the initial state and have certain elasticity.

Optionally, the distance between the inner plate and the gap plate is exactly the same as the gap distance between the simulated aluminum fin tube and the simulated metal heat sink tube.

Optionally, the friction between the first sliding sleeve, the second sliding sleeve and the spline shaft is small, that is, the spline shaft cannot drive the first sliding sleeve and the second sliding sleeve to move through the friction.

Compared with the prior art, the invention has the following advantages:

firstly, in order to overcome the defect that in the process of expanding and attaching the copper pipe, the copper pipe has certain deformation capacity, and the copper pipe generates certain stress when expanding and attaching, so that the copper pipe is easy to bend at the part which is not expanded and attached, namely, the copper pipe at the bent part cannot be tightly attached to the inner wall of the aluminum wing piece pipe, so that the service life of the water heater is shortened, in addition, in the prior art, one-way expansion is adopted, the difficulty of fixing the copper pipe is greatly increased, and the problem that the quality of a heat absorption plate core cannot reach the standard due to the fact that the copper pipe is bent due to stress is difficult to prevent is solved, so that the quality of the water heater is reduced;

secondly, the invention designs a clamping and fixing unit, an expansion unit and an anti-bending unit; before the preparation work, the first magnet and the second magnet are respectively sleeved on two sides of the outer surface of the simulated metal heat absorption pipe by manpower, the first magnet and the second magnet are mutually symmetrical, then the simulated aluminum wing piece pipe is sleeved on the outer surfaces of the first magnet and the second magnet, and two ends of the simulated aluminum wing piece pipe are mutually flush with two ends of the simulated metal heat absorption pipe, after the simulated aluminum wing piece pipe, the simulated metal heat absorption pipe, the first magnet and the second magnet are assembled in the above mode, the simulated aluminum wing piece pipe, the simulated metal heat absorption pipe, the first magnet and the second magnet are placed between the first vertical plate and the second vertical plate, namely, the simulated aluminum wing piece pipe, the simulated metal heat absorption pipe, the first magnet and the second magnet are positioned between the clamping and fixing units, then the simulated aluminum wing piece pipe, the simulated metal heat absorption pipe, the first magnet and the second magnet which are assembled together are fixed by the clamping and fixing units, then the expansion units start to work, the expansion units slowly enter the simulated metal heat absorption pipe from two ends of the inner parts of the expansion units, when the expansion units move to the designated positions inside of the simulated metal heat absorption pipe, in the process, the expansion unit drives the anti-bending unit to move simultaneously, so that the anti-bending unit enters gaps at two ends of the simulated aluminum fin tube and the simulated metal heat absorption tube, then the expansion unit slowly moves from the inside of the simulated metal heat absorption tube to the two ends again, namely moves outwards from the inside of the simulated metal heat absorption tube, and the expansion unit slowly expands the simulated metal heat absorption tube while moving, namely the simulated metal heat absorption tube expands and is tightly attached to the inner wall of the simulated aluminum fin tube, meanwhile, the expansion unit also attracts the first magnet and the second magnet, so that the first magnet and the second magnet are taken out from the gap between the simulated aluminum fin tube and the simulated metal heat absorption tube, the expansion of the simulated metal heat absorption tube is prevented from being influenced by the first magnet and the second magnet, and the anti-bending unit compresses two ends of the simulated metal heat absorption tube simultaneously during the expansion process, in order to prevent the simulated metal heat absorption tube from being bent, and exert appropriate pulling force to it, namely exert the outward pulling force to both ends of the simulated metal heat absorption pipe, thus offset the stress when the simulated metal heat absorption pipe expands, prevent it from buckling, after the simulated metal heat absorption pipe is totally laminated on the pipe inner wall of the simulated aluminum fin, take it away through the manpower at the same time, and take first magnet and second magnet off from expanding the unit at the same time, used in the laminating of the next group, in the whole treatment process, the fixed mount, first riser and second riser can guarantee the apparatus runs stably;

thirdly, the invention realizes that the bidirectional expansion attaching method is adopted, so that the production efficiency is accelerated, simultaneously, the copper pipe can be effectively prevented from being bent due to the stress action, the expansion attaching of the copper pipe is ensured to be tight, the quality of the heat absorbing plate core is ensured, and the service life of the water heater is prolonged.

Drawings

FIG. 1 is a schematic perspective view of a first embodiment of the present invention;

FIG. 2 is a schematic view of a first partial body structure according to the present invention;

FIG. 3 is a front view of the present invention;

FIG. 4 is a schematic perspective view of a clamping and fixing unit according to the present invention;

FIG. 5 is a perspective view of a portion of the clamping and fixing unit of the present invention;

FIG. 6 is a front view of a clamping fixture unit of the present invention;

FIG. 7 is a perspective view of the expansion unit of the present invention;

FIG. 8 is an elevation view of an expansion unit of the present invention;

FIG. 9 is a schematic view of a first partially assembled body structure of the expansion unit of the present invention;

FIG. 10 is a schematic view of a second partially assembled body of the stent of the present invention;

FIG. 11 is a perspective view of a third portion of the expansion element of the present invention;

FIG. 12 is a schematic perspective view of an anti-buckling unit according to the present invention;

FIG. 13 is a schematic view of a first partially separated body structure of the anti-buckling unit of the present invention;

FIG. 14 is a partial front view of the anti-buckling unit of the present invention;

FIG. 15 is a schematic view of a second partially separated body structure of the anti-buckling unit of the present invention;

fig. 16 is a perspective view of a third part of the anti-bending unit of the present invention.

Description of reference numerals: 1_ fixed frame, 2_ first riser, 3_ second riser, 4_ controller, 5_ simulated aluminum fin tube, 6_ simulated metal heat absorption tube, 7_ first magnet, 8_ second magnet, 201_ first electric putter, 202_ second electric putter, 203_ first arc clamp block, 204_ third electric putter, 205_ fourth electric putter, 206_ second arc clamp block, 301_ motor, 302_ transmission shaft, 303_ first bevel gear, 304_ second cone gear, 305_ two-way reverse thread screw, 306_ first connecting plate, 307_ first fixing plate, 308_ polished rod, 309_ second fixing plate, 3010_ U-shaped connecting plate, 3011_ fixed sleeve, 3012_ spline shaft, 3013_ L-shaped connecting plate, 3014_ third magnet, 3015_ first elastic expander, 3016_ second elastic expander, 3017_ third elastic expander, 3018_ fifth electric putter, 3019_ sixth electric putter, 3020_ seventh electric putter, 3021_ eighth electric putter, 3022_ ninth electric putter, 3023_ tenth electric putter, 401_ connecting block, 402_ connecting rope, 403_ limiting post, 404_ first pulley, 405_ second pulley, 406_ third pulley, 407_ inner plate, 408_ gap plate, 409_ first expansion plate, 4010_ second connecting post, 4011_ first sliding sleeve, 4012_ first connecting rod, 4013_ first spring, 4014_ limiting ring, 4015_ second sliding sleeve, 4016_ second connecting rod, 4017_ second spring, 4018_ third connecting rod, 4019_ third spring, 4020_ first connecting post, 4021_ third connecting post.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.

Examples

A two-way device for expanding and attaching a copper pipe in a heat absorption plate core of a solar water heater is shown in figures 1-3 and comprises a fixing frame 1, a first vertical plate 2, a second vertical plate 3, a controller 4, a simulated aluminum fin pipe 5, a simulated metal heat absorption pipe 6, a first magnet 7, a second magnet 8, an expansion unit and an anti-bending unit; two sides above the fixing frame 1 are fixedly connected with a first vertical plate 2 and a second vertical plate 3 respectively; the first vertical plate 2 is fixedly connected with the controller 4; a simulated aluminum fin tube 5 is arranged between the first vertical plate 2 and the second vertical plate 3; a simulated metal heat absorption tube 6 is arranged in the simulated aluminum fin tube 5; a first magnet 7 and a second magnet 8 are arranged between the simulated aluminum finned tube 5 and the simulated metal heat absorption tube 6; the two ends above the fixed frame 1 are provided with expansion units which can expand the simulated metal heat absorption pipe 6 and tightly attach to the inner wall of the simulated aluminum fin pipe 5; the expansion unit is provided with an anti-bending unit which can prevent the simulated metal heat absorption pipe 6 from bending when expanding; the expansion unit is fixedly connected with the fixed frame 1; a first vertical plate 2 is arranged at the front side of the expansion unit; the lower part of the bending prevention unit is connected with a fixing frame 1.

Before the preparation, a first magnet 7 and a second magnet 8 are respectively sleeved on two sides of the outer surface of a simulated metal heat absorption pipe 6 by manpower, the first magnet 7 and the second magnet 8 are mutually symmetrical, then a simulated aluminum fin pipe 5 is sleeved on the outer surfaces of the first magnet 7 and the second magnet 8, two ends of the simulated aluminum fin pipe 5 are mutually flush with two ends of the simulated metal heat absorption pipe 6, after the simulated aluminum fin pipe 5, the simulated metal heat absorption pipe 6, the first magnet 7 and the second magnet 8 are assembled in the above way, the simulated aluminum fin pipe 5, the simulated metal heat absorption pipe 6, the first magnet 7 and the second magnet 8 are placed between a first vertical plate 2 and a second vertical plate 3, namely, the simulated aluminum fin pipe 5, the simulated metal heat absorption pipe 6, the first magnet 7 and the second magnet 8 which are assembled together are positioned between clamping and fixing units, then the expansion unit starts to work, the expansion unit slowly enters the inside of the simulated metal heat absorption pipe 6 from two ends, when the expansion unit moves to the designated position inside the simulated metal heat absorption pipe 6, in the process, the expansion unit simultaneously drives the anti-bending unit to move, so that the anti-bending unit enters the gaps at the two ends of the simulated aluminum fin pipe 5 and the simulated metal heat absorption pipe 6, then the expansion unit slowly moves from the inside of the simulated metal heat absorption pipe 6 to the two ends, namely moves outwards from the inside of the simulated metal heat absorption pipe 6, and simultaneously, the expansion unit slowly expands the simulated metal heat absorption pipe 6, namely the simulated metal heat absorption pipe 6 expands and is tightly attached to the inner wall of the simulated aluminum fin pipe 5, meanwhile, the expansion unit also attracts the first magnet 7 and the second magnet 8, so that the first magnet 7 and the second magnet 8 are brought out from the gap between the simulated aluminum fin pipe 5 and the simulated metal heat absorption pipe 6 to prevent the expansion of the simulated metal heat absorption pipe 6 from being influenced, when the simulated aluminum finned tube 5 is expanded, in order to prevent the simulated metal heat absorption tube 6 from being bent, the anti-bending unit simultaneously compresses two ends of the simulated metal heat absorption tube 6 and applies proper tension to the simulated metal heat absorption tube, namely, outward tension is applied to two ends of the simulated metal heat absorption tube 6, so that stress generated when the simulated metal heat absorption tube 6 is expanded is offset, and the simulated metal heat absorption tube is prevented from being bent; the invention realizes that the bidirectional expansion fitting method is adopted, so that the production efficiency is accelerated, the copper pipe can be effectively prevented from being bent under the action of stress, the expansion fitting of the copper pipe is ensured to be tight, the quality of the heat absorbing plate core is ensured, and the service life of the water heater is prolonged.

As shown in fig. 4-6, the device further comprises a clamping and fixing unit, wherein the clamping and fixing unit comprises a first electric push rod 201, a second electric push rod 202, a first arc-shaped clamping block 203, a third electric push rod 204, a fourth electric push rod 205 and a second arc-shaped clamping block 206; the first electric push rod 201 is fixedly connected with the second vertical plate 3; the first electric push rod 201 is fixedly connected with the first arc-shaped clamping block 203; the first arc-shaped clamping block 203 is fixedly connected with the second electric push rod 202; the second electric push rod 202 is fixedly connected with the second vertical plate 3; a third electric push rod 204 is arranged on the side surface of the first electric push rod 201; the third electric push rod 204 is fixedly connected with the second vertical plate 3; the third electric push rod 204 is fixedly connected with the second arc-shaped clamping block 206; the second arc-shaped clamping block 206 is fixedly connected with the fourth electric push rod 205; the fourth electric push rod 205 is fixedly connected with the second vertical plate 3; a first electric push rod 201, a second electric push rod 202, a first arc-shaped clamping block 203, a third electric push rod 204, a fourth electric push rod 205 and a second arc-shaped clamping block 206 are symmetrically arranged in groups on two sides of the simulated aluminum fin tube 5; the other group of the first electric push rod 201, the second electric push rod 202, the third electric push rod 204 and the fourth electric push rod 205 are fixedly connected with the first vertical plate 2.

Before the preparation, the first magnet 7 and the second magnet 8 are respectively sleeved on two sides of the outer surface of the simulated metal heat absorption pipe 6 by manpower, the first magnet 7 and the second magnet 8 are mutually symmetrical, then the simulated aluminum finned pipe 5 is sleeved on the outer surfaces of the first magnet 7 and the second magnet 8, two ends of the simulated aluminum finned pipe 5 are mutually flush with two ends of the simulated metal heat absorption pipe 6, after the simulated aluminum finned pipe 5, the simulated metal heat absorption pipe 6, the first magnet 7 and the second magnet 8 are assembled in the above way, the simulated aluminum finned pipe is placed between the first vertical plate 2 and the second vertical plate 3, namely between the two groups of first arc-shaped clamping blocks 203 and the second arc-shaped clamping blocks 206, and then the two groups of first electric push rods 201, the second electric push rods 202, the third electric push rods 204 and the fourth electric push rods 205 drive the two groups of first arc-shaped clamping blocks 203 and the second arc-shaped clamping blocks 206 to mutually approach to each other, the simulated aluminum finned tube 5, the simulated metal heat absorption tube 6, the first magnet 7 and the second magnet 8 which are assembled together are clamped and fixed through two groups of first arc-shaped clamping blocks 203 and second arc-shaped clamping blocks 206; the unit completes the work of fixing the assembled simulated aluminum fin tube 5, the simulated metal heat absorption tube 6, the first magnet 7 and the second magnet 8.

As shown in fig. 7 to 11, the expansion unit includes a motor 301, a transmission shaft 302, a first bevel gear 303, a second bevel gear 304, a bidirectional reverse-threaded lead screw 305, a first connecting plate 306, a first fixing plate 307, a polished rod 308, a second fixing plate 309, a U-shaped connecting plate 3010, a fixing sleeve 3011, a spline shaft 3012, an L-shaped connecting plate 3013, a third magnet 3014, a first elastic expander 3015, a second elastic expander 3016, a third elastic expander 3017, a fifth electric push rod 3018, a sixth electric push rod 3019, a seventh electric push rod 3020, an eighth electric push rod 3021, a ninth electric push rod 3022, and a tenth electric push rod 3023; the motor 301 is fixedly connected with the first vertical plate 2; the motor 301 is fixedly connected with the transmission shaft 302 through an output shaft; the transmission shaft 302 is rotatably connected with the first vertical plate 2; the transmission shaft 302 is fixedly connected with a first bevel gear 303; the first bevel gear 303 meshes with the second bevel gear 304; the second bevel gear 304 is fixedly connected with a bidirectional reverse-thread screw rod 305; the bidirectional reverse-thread screw 305 is screwed with the first connecting plate 306; the bidirectional reverse-thread screw 305 is rotatably connected with a first fixing plate 307; the first connecting plate 306 is in sliding connection with the polish rod 308; the first connecting plate 306 is fixedly connected with the U-shaped connecting plate 3010; the first connecting plate 306 is fixedly connected with the fixed sleeve 3011; the first fixing plate 307 is fixedly connected with the fixing frame 1; the polish rod 308 is fixedly connected with a second fixing plate 309; the second fixing plate 309 is fixedly connected with the fixing frame 1; the U-shaped connecting plate 3010 is fixedly connected with the fixed sleeve 3011; the fixed sleeve 3011 is fixedly connected with the spline shaft 3012; the spline shaft 3012 is connected with an anti-bending unit; three groups of L-shaped connecting plates 3013 are arranged in an annular array on the spline shaft 3012; one end of the spline shaft 3012 is fixedly connected to a fifth electric push rod 3018, a sixth electric push rod 3019, a seventh electric push rod 3020, an eighth electric push rod 3021, a ninth electric push rod 3022, and a tenth electric push rod 3023 at the same time; the three groups of L-shaped connecting plates 3013 are fixedly connected with the third magnet 3014; the first elastic expander 3015 is in contact with both the second elastic expander 3016 and the third elastic expander 3017; the first elastic expander 3015 is fixedly connected to the fifth electric push rod 3018 and the sixth electric push rod 3019 at the same time; the second elastic expander 3016 is in contact with the third elastic expander 3017; the second elastic expander 3016 is fixedly connected to the seventh electric push rod 3020 and the eighth electric push rod 3021 at the same time; the third elastic expander 3017 is fixedly connected to the ninth electric push rod 3022 and the tenth electric push rod 3023 at the same time; a first connecting plate 306, a first fixing plate 307, a second fixing plate 309, a U-shaped connecting plate 3010, a fixing sleeve 3011, a spline shaft 3012, and third to tenth electric push rods 3014 to 3023 are symmetrically arranged in groups at two ends of the bidirectional reverse-thread screw rod 305; three groups of L-shaped connecting plates 3013 are arranged on two groups of spline shafts 3012 in an annular array.

After the simulated aluminum finned tube 5, the simulated metal heat absorption tube 6, the first magnet 7 and the second magnet 8 which are assembled together are fixed, the motor 301 starts to work, the motor 301 drives the transmission shaft 302 to rotate through the output shaft, the transmission shaft 302 drives the second bevel gear 304 through the first bevel gear 303, the second bevel gear 304 drives the bidirectional reverse-thread screw 305 to rotate, the bidirectional reverse-thread screw 305 drives the two groups of first connecting plates 306 to slide on the polished rod 308 in a mutually approaching way, namely, the two groups of first connecting plates 306 drive the two groups of fixing sleeves 3011 and the U-shaped connecting plates 3010 to move towards the inside of the simulated metal heat absorption tube 6, namely, the two groups of fixing sleeves 3011 drive the two groups of spline shafts 3012 to move towards the inside of the simulated metal heat absorption tube 6, so as to drive the six groups of L-shaped connecting plates 3013, the two groups of third magnets 3014 to the tenth electric push rods 3023 and the bending prevention units to move towards the inside of the simulated metal heat absorption tube 6 through the two groups of spline shafts 3012, two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 are contacted with each other, that is, they are just moved to the middle position inside the simulated metal heat absorption pipe 6, at this time, two groups of third magnets 3014 are attracted to the first magnets 7 and the second magnets 8, then two groups of fifth electric push rods 3018, sixth electric push rods 3019, seventh electric push rods 3020, eighth electric push rods 3021, ninth electric push rods 3022 and tenth electric push rods 3023 make two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 expand outwards, when two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 are fully expanded, the simulated metal heat absorption pipe 6 is just made to be closely attached to the inner wall of the simulated aluminum finned pipe 5, then the motor 301 is reversed, so as to reverse the two-way reverse thread screw 305, that is, two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 are completely expanded, and the motor 301 is reversed, thus making two groups of first elastic expanders 3015, second elastic expanders 3016 and second elastic expanders 5 and third elastic expanders 3017 be reversed, The second elastic expander 3016 and the third elastic expander 3017 respectively move from the middle position inside the simulated metal heat absorption tube 6 to the two ends thereof, and simultaneously, the two ends of the simulated metal heat absorption tube 6 are compressed and straightened by the anti-bending unit, so that the simulated metal heat absorption tube 6 is not bent when the simulated metal heat absorption tube 6 is slowly attached to the inner wall of the simulated aluminum fin tube 5 by the two groups of first elastic expanders 3015, the second elastic expanders 3016 and the third elastic expanders 3017, and the first magnet 7 and the second magnet 8 are brought out from the gap between the simulated aluminum fin tube 5 and the simulated metal heat absorption tube 6 by the two groups of third magnets 3014, so as to prevent the first magnet 7 and the second magnet 8 from obstructing the expansion and attachment of the simulated metal heat absorption tube 6, and after the two groups of third magnets 3014 move to the two ends of the simulated metal heat absorption tube 6 and contact with the six groups of gap plates 408, the two groups of third magnets 3014 push the six groups of gap plates 408, so that the six groups of gap plates 408 move out of the gap between the simulated aluminum fin tube 5 and the simulated metal heat absorption tube 6, and further ensure that the simulated metal heat absorption tube 6 can be completely attached to the inner wall of the simulated aluminum fin tube 5 and cannot be blocked by the gap plates 408 and other components, and in the whole process, the two groups of first fixing plates 307 and second fixing plates 309 can ensure that the equipment runs stably; the unit completes the expansion fitting of the simulated metal heat absorption tube 6 and assists the operation of the anti-bending unit.

As shown in fig. 12 to 16, the anti-bending unit includes a connection block 401, a connection rope 402, a limiting column 403, a first pulley 404, a second pulley 405, a third pulley 406, an inner plate 407, a gap plate 408, a first expansion plate 409, a second connection column 4010, a first sliding sleeve 4011, a first connection rod 4012, a first spring 4013, a limit ring 4014, a second sliding sleeve 4015, a second connection rod 4016, a second spring 4017, a third connection rod 4018, a third spring 4019, a first connection column 4020 and a third connection column 4021; the connecting block 401 is fixedly connected with one end of the spline shaft 3012; the connecting block 401 is fixedly connected with the connecting rope 402; the connecting string 402 is slidably connected to the restraining post 403; the connecting rope 402 is simultaneously in sliding connection with a first pulley 404, a second pulley 405 and a third pulley 406; the connecting rope 402 is fixedly connected with the inner plate 407; the limiting column 403 is fixedly connected with the fixing frame 1; the first pulley 404 is rotatably connected with the first connecting post 4020; the second pulley 405 is rotatably connected with the third connecting column 4021; the third pulley 406 is rotatably connected with the second connecting post 4010; the inner plate 407 is fixedly connected with the first expansion plate 409; the first expansion plate 409 is fixedly connected with the gap plate 408; the first expansion plate 409 is fixedly connected with the first sliding sleeve 4011; the first sliding sleeve 4011 is in sliding connection with the spline shaft 3012; the first sliding sleeve 4011 is simultaneously in sliding connection with the first connecting rod 4012, the second connecting rod 4016 and the third connecting rod 4018; the first sliding sleeve 4011 is fixedly connected with the first spring 4013, the second spring 4017 and the third spring 4019 at the same time; the first connecting rod 4012, the second connecting rod 4016 and the third connecting rod 4018 are fixedly connected with the limiting ring 4014; the first spring 4013, the second spring 4017 and the third spring 4019 are fixedly connected with a limit ring 4014; the limit ring 4014 is fixedly connected with the second sliding sleeve 4015; the second sliding sleeve 4015 is in sliding connection with the spline shaft 3012; the connecting ropes 402, the first connecting columns 4020, the third connecting columns 4021 and the second connecting columns 4010 are arranged in three groups in an annular array by taking the central point of the first sliding sleeve 4011 as a base point; the connecting block 401 and the first sliding sleeve 4011 to the third spring 4019 are symmetrically provided with one group on each of the two groups of spline shafts 3012; three groups of connecting ropes 402, first connecting columns 4020, third connecting columns 4021 and second connecting columns 4010 are arranged on the central points of the two groups of first sliding sleeves 4011 in an annular array.

When the two sets of spline shafts 3012 move towards the inside of the simulated metal heat absorption pipe 6, the two sets of spline shafts 3012 drive the two sets of connecting blocks 401 to move, so that the six sets of connecting ropes 402 move through the two sets of connecting blocks 401, that is, the six sets of connecting ropes 402 slide on the six sets of first pulleys 404, the six sets of second pulleys 405 and the six sets of third pulleys 406, that is, the six sets of first pulleys 404, the six sets of second pulleys 405 and the six sets of third pulleys 406 rotate around the axes of the six sets of first connecting columns 4020, the six sets of third connecting columns 4021 and the six sets of second connecting columns 4010, so as to ensure the stability of the device, and the six sets of connecting ropes 402, while moving, will cause a certain pulling force to the six sets of inner plates 407, so that the six sets of inner plates 407 slowly shrink towards the central points of the two sets of first sliding sleeves 4011, that the six sets of first sliding sleeves 409 compress the six sets of first telescopic plates 409, so that the six sets of gap plates 408 are also slowly shrink towards the central points 4011 through the six sets of first sliding sleeves 409, meanwhile, when the two groups of first connection plates 306 move towards the simulated metal heat absorption tubes 6, the two groups of first connection plates 306 push the two groups of limiting rings 4014 to move, that is, the two groups of limiting rings 4014 drive the two groups of second sliding sleeves 4015, the two groups of first connection rods 4012, the two groups of first springs 4013, the two groups of second connection rods 4016, the two groups of second springs 4017, the two groups of third connection rods 4018 and the two groups of third springs 4019 to move, that is, the two groups of first sliding sleeves 4011 are driven to move, so that the two groups of first sliding sleeves 4011 drive the six groups of inner plates 407, the six groups of gap plates 408, the six groups of first expansion plates 409 and the six groups of simulated metal heat absorption tubes 6 to move, that the six groups of connection ropes 402 are pulled by the six groups of inner plates 407, because the six groups of connection ropes 402 are set to be in a loose state and have certain elasticity, when the two groups of first

elastic expanders

3015, 4011, and 4011, and 4011, the combination of the corresponding to which is used for each of the corresponding to which is made of the corresponding to be made of the metal heat absorption tube, In the process that the second elastic expander 3016 and the third elastic expander 3017 move to the designated position inside the simulated metal heat absorption pipe 6, the six groups of connecting ropes 402 are continuously tensioned, so that the six groups of first expansion plates 409 are continuously contracted, when the two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 are about to move to the designated position inside the simulated metal heat absorption pipe 6, the six groups of gap plates 408 are just positioned at the gaps between the simulated aluminum fin pipe 5 and the simulated metal heat absorption pipe 6 and just contact with the two ends of the simulated aluminum fin pipe 5 and the simulated metal heat absorption pipe 6, at this time, the inner plate 407 also just contacts with the inner wall of the simulated metal heat absorption pipe 6, then the two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 continue to move, so that the six groups of gap plates 408 enter the gaps between the two ends of the simulated aluminum fin pipe 5 and the simulated metal heat absorption pipe 6, the six groups of inner plates 407 enter the interior of the two ends of the simulated metal heat absorption pipe 6, then the motor 301 rotates reversely to make the two groups of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 move outwards, i.e. make the two groups of spline shafts 3012 move outwards, and make the six groups of connecting ropes 402 slowly return to a slack state while the two groups of spline shafts 3012 move, so that the six groups of first expansion plates 409 and slowly stretch, i.e. make the six groups of inner plates 407 and gap plates 408 expand outwards, but under the limit of the simulated aluminum fin pipe 5, the six groups of inner plates 407 and gap plates 408 cannot expand outwards, so that the six groups of inner plates 407 and gap plates 408 have an expansion and compression force on the two ends of the simulated metal heat absorption pipe 6 by the tensile force of the six groups of first expansion plates 409, and at the same time, when the two groups 3012 move outwards, the two groups of first sliding sleeves 4011, spline shafts 4011, and spline shafts 4017, The two groups of second sliding sleeves 4015 and the two groups of spline shafts 3012 have smaller friction force, so the two groups of spline shafts 3012 cannot drive the two groups of first sliding sleeves 4011 and the two groups of second sliding sleeves 4015 to move, so that the six groups of inner plates 407 and the gap plates 408 can always generate an expansion force on two ends of the simulated metal heat absorption tube 6, and the six groups of connecting ropes 402 also have an outward pulling force on the six groups of inner plates 407, i.e. pull the inner plates to move away from the simulated metal heat absorption tube 6, but because of the resilience force of the six groups of first expansion plates 409, the six groups of inner plates 407 and the gap plates 408 cannot be pulled by the pulling force, i.e. in the expansion and fitting process of the simulated metal heat absorption tube 6, the six groups of inner plates 407 and the gap plates 408 have a certain expansion force and a certain pulling force on two ends of the simulated metal heat absorption tube 6 at the same time, by the two groups of inner plates 407 and the gap plates 408, when the two groups of third magnets 3014 contact with the six groups of gap plates 408, when the two groups of third magnets 3014 continue to move outwards, the two groups of third magnets 3014 push the six groups of gap plates 408 to move outwards, so that the six groups of inner plates 407 and the gap plates 408 move out of the gap between the simulated aluminum fin tube 5 and the simulated metal heat absorbing tube 6, and the simulated metal heat absorbing tube 6 can be completely attached to the inner wall of the simulated aluminum fin tube 5, and after the expansion force and the tensile force of the six groups of inner plates 407 and the gap plates 408 are lost, a small part of the simulated metal heat absorbing tube 6 which is not expanded and attached does not need to be bent, and as most of the simulated metal heat absorbing tubes 6 which are expanded and attached can generate a fixing effect on the rest part of the simulated metal heat absorbing tubes 6, even if the simulated metal heat absorbing tubes are not bent; this unit performs the task of preventing the dummy metal heat absorbing tube 6 from buckling when expanded.

The two sets of first elastic expanders 3015, second elastic expanders 3016 and third elastic expanders 3017 are all expanding materials with certain elasticity, and the initial state is a contracted state.

So that the two sets of the first elastic expanders 3015, the second elastic expanders 3016 and the third elastic expanders 3017 can expand, thereby expanding the simulated metal heat absorption tube 6.

After the first elastic expander 3015, the second elastic expander 3016 and the third elastic expander 3017 are completely expanded, the simulated metal heat absorption tube 6 can be just expanded, and the simulated metal heat absorption tube is just tightly attached to the inner wall of the simulated aluminum fin tube 5.

So that the simulated metal heat absorption pipe 6 can be tightly attached to the inner wall of the simulated aluminum fin pipe 5.

The six sets of connecting strings 402 are initially in a relaxed state and have some elasticity.

So that the inner plate 407 and the gap plate 408 can slowly contract toward the center point of the first sliding sleeve 4011 until the gap plate 408 just moves into the gap between the simulated aluminum fin tube 5 and the simulated metal heat sink tube 6.

The distance between the inner plate 407 and the gap plate 408 is exactly the same as the gap distance between the simulated aluminum fin tubes 5 and the simulated metal heat sink tubes 6.

The inner plate 407 and the gap plate 408 exert expanding internal tension and pulling force on two ends of the simulated metal heat absorption pipe 6, so that the simulated metal heat absorption pipe 6 is prevented from being bent.

The friction between the first sliding sleeve 4011, the second sliding sleeve 4015 and the spline shaft 3012 is small, that is, the spline shaft 3012 cannot drive the first sliding sleeve 4011 and the second sliding sleeve 4015 to move through friction.

So that the inner plate 407 and the gap plate 408 can be separated from the dummy metal heat absorbing pipe 6 after the expansion and attachment of most of the dummy metal heat absorbing pipes 6 are completed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A bidirectional device for expanding and jointing a copper pipe in a heat absorption plate core of a solar water heater comprises a fixing frame, a first vertical plate, a second vertical plate, a simulated aluminum fin pipe, a simulated metal heat absorption pipe, a first magnet and a second magnet; two sides above the fixing frame are fixedly connected with the first vertical plate and the second vertical plate respectively; a simulated aluminum fin tube is arranged between the first vertical plate and the second vertical plate; a simulated metal heat absorption pipe is arranged in the simulated aluminum fin tube; a first magnet and a second magnet are arranged between the simulated aluminum fin tube and the simulated metal heat absorption tube; it is characterized by also comprising an expansion unit and an anti-bending unit; expansion units which can expand the simulated metal heat absorption pipe and are tightly attached to the inner wall of the simulated aluminum fin pipe are arranged at the two ends above the fixing frame; the expansion unit is provided with an anti-bending unit which can prevent the simulated metal heat absorption pipe from bending when expanding; the expansion unit is fixedly connected with the fixing frame; a first vertical plate is arranged on the front side of the expansion unit; the lower part of the bending prevention unit is connected with a fixing frame.

2. The device for expanding and jointing the copper pipe in the heat absorption plate core of the solar water heater in the two-way mode according to claim 1, wherein the expanding unit comprises a motor, a transmission shaft, a first bevel gear, a second bevel gear, a two-way reverse thread screw rod, a first connecting plate, a first fixing plate, a polished rod, a second fixing plate, a U-shaped connecting plate, a fixing sleeve, a spline shaft, an L-shaped connecting plate, a third magnet, a first elastic expander, a second elastic expander, a third elastic expander, a fifth electric push rod, a sixth electric push rod, a seventh electric push rod, an eighth electric push rod, a ninth electric push rod and a tenth electric push rod; the motor is fixedly connected with the first vertical plate; the motor is fixedly connected with the transmission shaft through an output shaft; the transmission shaft is rotatably connected with the first vertical plate; the transmission shaft is fixedly connected with the first bevel gear; the first bevel gear is meshed with the second bevel gear; the second bevel gear is fixedly connected with the bidirectional reverse-thread screw rod; the bidirectional reverse-thread screw rod is connected with the first connecting plate in a screwing manner; the bidirectional reverse-thread screw rod is rotationally connected with the first fixing plate; the first connecting plate is in sliding connection with the polish rod; the first connecting plate is fixedly connected with the U-shaped connecting plate; the first connecting plate is fixedly connected with the fixed sleeve; the first fixing plate is fixedly connected with the fixing frame; the polish rod is fixedly connected with the second fixing plate; the second fixing plate is fixedly connected with the fixing frame; the U-shaped connecting plate is fixedly connected with the fixed sleeve; the fixed sleeve is fixedly connected with the spline shaft; the spline shaft is connected with an anti-bending unit; three groups of L-shaped connecting plates are arranged on the spline shaft in an annular array; one end of the spline shaft is fixedly connected with a fifth electric push rod, a sixth electric push rod, a seventh electric push rod, an eighth electric push rod, a ninth electric push rod and a tenth electric push rod at the same time; the three groups of L-shaped connecting plates are fixedly connected with the third magnet; the first elastic expander is simultaneously contacted with the second elastic expander and the third elastic expander; the first elastic expander is fixedly connected with the fifth electric push rod and the sixth electric push rod simultaneously; the second elastic expander is in contact with the third elastic expander; the second elastic expander is fixedly connected with the seventh electric push rod and the eighth electric push rod simultaneously; the third elastic expander is fixedly connected with the ninth electric push rod and the tenth electric push rod at the same time; the first connecting plate, the first fixing plate, the second fixing plate, the U-shaped connecting plate, the fixing sleeve, the spline shaft, the third magnet to the tenth electric push rod are symmetrically arranged in a group at two ends of the bidirectional reverse thread screw rod respectively; three groups of L-shaped connecting plates are arranged on the two groups of spline shafts in an annular array.

3. The device for expanding and fitting the copper pipe in the heat absorption plate core of the solar water heater in the two-way mode according to claim 2, wherein the anti-bending unit comprises a connecting block, a connecting rope, a limiting column, a first pulley, a second pulley, a third pulley, an inner plate, a gap plate, a first expansion plate, a second connecting column, a first sliding sleeve, a first connecting rod, a first spring, a limiting ring, a second sliding sleeve, a second connecting rod, a second spring, a third connecting rod, a third spring, a first connecting column and a third connecting column; the connecting block is fixedly connected with one end of the spline shaft; the connecting block is fixedly connected with the connecting rope; the connecting rope is in sliding connection with the limiting column; the connecting rope is simultaneously in sliding connection with the first pulley, the second pulley and the third pulley; the connecting rope is fixedly connected with the inner plate; the limiting column is fixedly connected with the fixing frame; the first pulley is rotatably connected with the first connecting column; the second pulley is rotatably connected with the third connecting column; the third pulley is rotatably connected with the second connecting column; the inner plate is fixedly connected with the first expansion plate; the first expansion plate is fixedly connected with the gap plate; the first expansion plate is fixedly connected with the first sliding sleeve; the first sliding sleeve is in sliding connection with the spline shaft; the first sliding sleeve is simultaneously in sliding connection with the first connecting rod, the second connecting rod and the third connecting rod; the first sliding sleeve is fixedly connected with the first spring, the second spring and the third spring at the same time; the first connecting rod, the second connecting rod and the third connecting rod are fixedly connected with the limiting ring; the first spring, the second spring and the third spring are fixedly connected with the limiting ring; the limiting ring is fixedly connected with the second sliding sleeve; the second sliding sleeve is in sliding connection with the spline shaft; the connecting ropes, the first connecting column, the third connecting column and the second connecting column are arranged in three groups in an annular array by taking the central point of the first sliding sleeve as a base point; the connecting block, the first sliding sleeve and the third spring are symmetrically provided with one group on each of the two groups of spline shafts; three groups of connecting ropes, first connecting columns, third connecting columns and second connecting columns are arranged on the central points of the two groups of first sliding sleeves in an annular array mode.

4. The device for expanding and jointing the copper pipe in the heat absorption plate core of the solar water heater in a bidirectional mode according to any one of claims 2 to 3, wherein the two groups of the first elastic expander, the second elastic expander and the third elastic expander are made of expanding materials with certain elasticity, and the initial state of the two groups of the first elastic expander, the second elastic expander and the third elastic expander is a contracted state.

5. The device for expanding and jointing the copper pipe in the heat absorption plate core of the solar water heater in the two-way mode according to claim 2, wherein the first elastic expander, the second elastic expander and the third elastic expander just can expand the simulated metal heat absorption pipe after being completely expanded, and just can be tightly jointed with the inner wall of the simulated aluminum fin pipe.

6. The device for expanding and jointing the copper pipe in the heat absorption plate core of the solar water heater in the bidirectional mode according to claim 3, wherein the six groups of connecting ropes are in a relaxed state in an initial state and have certain elasticity.

7. The apparatus of claim 3, wherein the distance between the inner plate and the gap plate is exactly the same as the gap distance between the simulated aluminum fin tubes and the simulated metal heat absorber tubes.

8. The device for expanding and fitting the copper pipe in the heat absorption plate core of the solar water heater in a bidirectional mode according to claim 3, wherein friction between the first sliding sleeve and the spline shaft is small, namely the spline shaft cannot drive the first sliding sleeve and the second sliding sleeve to move through the friction.