Nitrogen charging equipment and heat exchanger production line

Abstract

The utility model relates to the field of air conditioner production, in particular to nitrogen charging equipment and a heat exchanger production line, the nitrogen charging equipment comprises a nitrogen charging device, a nitrogen charging butt-joint piece and a nitrogen charging robot, the nitrogen charging butt-joint piece is installed on a nitrogen charging pipeline externally connected with the nitrogen charging device, a butt-joint channel gradually expanding along the direction away from the nitrogen charging pipeline is formed in the nitrogen charging butt-joint piece, and the butt-joint channel is communicated with the nitrogen charging robot. The nitrogen charging robot comprises a nitrogen charging robot body and a nitrogen charging clamp, the nitrogen charging robot is arranged on the side of a nitrogen charging station on the fin conveying line, the nitrogen charging clamp is arranged on the nitrogen charging robot, and the nitrogen charging clamp is configured to be used for clamping the nitrogen charging butt joint piece to be in butt joint with the pipeline piece on the fin stack and charging nitrogen into the pipeline piece. During nitrogen charging, the nitrogen charging robot clamps the nitrogen charging pipeline and is in butt joint with the pipeline piece on the heat exchanger through the butt joint channel, in the butt joint process, the guiding effect is achieved, the butt joint difficulty is reduced, the butt joint sealing effect is improved, the butt joint process is completed through the nitrogen charging robot, the mechanization and automation degree is high, and the labor cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air conditioning equipment technical field, especially, relate to a kind of nitrogen filling equipment and heat exchanger production line. BACKGROUND

[0002] In air conditioning industry, the heat exchanger in air conditioner refers to evaporator and condenser, plays the role of evaporation, heat dissipation and heat exchange, is important component of refrigeration system.

[0003] In the manufacturing process of heat exchanger, worker transfers the fin stack stored in buffer area to pipe-through tooling table with material transfer car to operate, for example, after pipe insertion on fin stack is completed, nitrogen filling is needed to prevent copper pipe inner wall from producing oxide skin under high temperature.

[0004] The existing nitrogen filling process mainly relies on manual insertion of nitrogen filling interface of nitrogen filling device and copper pipe port, and nitrogen filling time also needs to be grasped by manual, which requires high experience of operator, and positioning is difficult when nitrogen filling interface and copper pipe port are connected, gap may exist, which leads to nitrogen leakage, not only causing waste, but also affecting safety of operator. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of nitrogen filling equipment and heat exchanger production line to solve the problems of existing technology, such as manual connection of nitrogen filling interface and copper pipe port before heat exchanger welding, difficult positioning, great dependence on operation experience of operator, and easy nitrogen leakage.

[0006] To achieve the utility model purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, the utility model provides a kind of nitrogen filling equipment, which includes:

[0008] Nitrogen filling device, which is connected with nitrogen filling pipeline;

[0009] Nitrogen filling connector, which is arranged at the end of the nitrogen filling pipeline, and the nitrogen filling connector forms a gradually expanding connecting channel inside;

[0010] Nitrogen filling robot, which includes nitrogen filling robot body and nitrogen filling clamp, the nitrogen filling robot is arranged beside nitrogen filling station of fin conveying line, the nitrogen filling clamp is arranged on the nitrogen filling robot, and the nitrogen filling clamp is configured to clamp nitrogen filling connector and pipeline component on fin stack to connect, and nitrogen gas is filled into the pipeline component.

[0011] In another aspect, the application also provides a kind of heat exchanger production line, which includes support frame, fin conveying line and any of the above-mentioned nitrogen filling equipment, the fin conveying line is arranged on the support frame, and the nitrogen filling room is located directly above the fin conveying line.

[0012] Compared with the prior art, the application has the advantages and positive effects that:

[0013] The nitrogen filling equipment relates to a nitrogen filling device, a nitrogen filling butt joint and a nitrogen filling robot, the nitrogen filling butt joint is installed on the nitrogen filling pipeline connected to the nitrogen filling device, a butt joint channel gradually expanding away from the nitrogen filling pipeline is formed in the nitrogen filling butt joint, the nitrogen filling robot clamps the nitrogen filling pipeline during nitrogen filling, and butt joint with the pipeline piece on the heat exchanger is realized through the butt joint channel.

[0014] Other features and advantages of the present application will become more apparent after reading the specific embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a schematic diagram of the heat exchanger production line according to the embodiment;

[0017] Figure 2 It is a partial structure diagram of the fin storage and retrieval equipment according to the embodiment;

[0018] Figure 3 It is a position diagram of the lifting support plate in the storage state according to the embodiment;

[0019] Figure 4 It is a position diagram of the lifting support plate in the material taking state according to the embodiment;

[0020] Figure 5 It is a structure diagram of the lifting support plate according to the embodiment;

[0021] Figure 6 It is a structure diagram of the offline robot according to the embodiment;

[0022] Figure 7 It is a structure diagram of the offline clamp;

[0023] Figure 8 It is a structure diagram of the second offline clamping piece according to the embodiment;

[0024] Figure 9 It is an enlarged view of A in Figure 8 ;

[0025] Figure 10 Structural diagram of the endplate mounting equipment;

[0026] Figure 11 A diagram showing the conveying status of the finned stack on the short plate mounting equipment;

[0027] Figure 12 This is a schematic diagram showing the position of the lifting component on the end plate mounting equipment.

[0028] Figure 13 Structural diagram of the robot for endplate installation;

[0029] Figure 14 for Figure 13 A diagram showing the connection at point B in the diagram;

[0030] Figure 15 This is a diagram showing the state of the end plate clamp holding the end plate component.

[0031] Figure 16 This is a structural diagram of a heat exchanger;

[0032] Figure 17 This is a structural diagram of an intubation robot;

[0033] Figure 18 This is a structural diagram of the cannulation clamp;

[0034] Figure 19 This is a structural diagram of the transfer fixture;

[0035] Figure 20 Here is a structural diagram of the nitrogen filling equipment;

[0036] Figure 21 This is a structural diagram of an intubation robot;

[0037] Figure 22 Diagram of the pipe clamp structure;

[0038] Figure 23 This is one of the connection diagrams for nitrogen-filled fittings and piping components;

[0039] Figure 24 for Figure 23 CC section view in the middle;

[0040] Figure 25 Diagram 2 showing the connection between the nitrogen-filled fitting and the piping fitting;

[0041] Figure 26 Diagram of elastic component connection;

[0042] Figure label:

[0043] 100. Finned conveyor line; 110. Upstream conveyor line; 111. Roller; 112. Pallet component;

[0044] 120, downstream conveying line; 130, pipe expanding device; 140, pipe drying device; 150, transfer robot; 151, transfer middle beam; 152, transfer driving member; 153, transfer clamping plate;

[0045] 160, pipe bending device; 170, pipe welding device; 180, helium detection device; 190, pipe bending device;

[0046] 200, support frame;

[0047] 300, fin stack; 310, blanking needle; 320, positioning needle; 330, end plate member; 340, pipe member;

[0048] 400, fin storage and taking device; 410, storage and taking support frame; 420, support bottom plate;

[0049] 430, lifting support plate; 431, support convex part; 432, communication hole;

[0050] 440, lifting cylinder; 450, lower line robot; 451, lower line robot body; 4511, lower line robot base; 4512, lower line robot large arm; 4513, lower line robot small arm; 452, lower line clamp; 4521, first lower line clamping member; 4522, second lower line clamping member; 4523, adapter plate; 4524, second positioning clamping plate; 4525, second positioning recess; 4526, guide inclined surface; 4527, second connecting plate; 4528, reinforcing rib;

[0051] 500, end plate mounting device; 510, end plate mounting robot; 511, end plate robot body; 512, connecting middle beam; 513, end plate clamp; 514, pushing member;

[0052] 520, lifting stop member; 521, lifting driving member; 522, stop part; 5221, stop block;

[0053] 530, jacking member;

[0054] 540, centering assembly; 541, centering cross beam; 542, guide section; 543, centering support frame;

[0055] 550, detection member;

[0056] 600, pipe inserting device; 610, pipe inserting robot; 611, pipe inserting robot body; 612, pipe inserting clamp; 613, intermediate connecting part; 614, pipe grasping clamp; 6141, grasping cylinder; 6142, grasping end head; 6144, grasping recess;

[0057] 700, nitrogen filling equipment; 710, nitrogen filling device; 711, nitrogen filling pipeline; 720, nitrogen filling docking piece; 730, nitrogen filling robot; 731, nitrogen filling robot body; 732, nitrogen filling clamp; 733, clamping jaw assembly; 7331, first clamping jaw; 7332, and second clamping jaw; 7333, clamping recess; 740, nitrogen filling room; 750, elastic member;

[0058] 800, controller. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0060] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0061] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0062] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0064] The disclosure below provides many different embodiments or examples for implementing different structures of the application. For the purpose of simplification, the components and arrangements of specific examples are described below. Of course, they are only examples and the purpose is not to limit the application. In addition, the application can repeatedly refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0065] Reference Figure 1 The present application provides a heat exchanger production line, which comprises a support frame 200, a fin conveying line 100, and a plurality of processing equipment arranged along the conveying direction of the fin conveying line 100.

[0066] The fin conveying line 100 is mounted on the support frame 200, and along the conveying direction of the fin conveying line 100, at least a fin access position, an end plate mounting position, a pipe inserting station and a nitrogen filling station are arranged.

[0067] The processing equipment includes fin access equipment 400 corresponding to the fin access position, end plate mounting equipment 500 corresponding to the end plate mounting position, pipe inserting equipment 600 corresponding to the pipe inserting station, and nitrogen filling equipment 700 corresponding to the nitrogen filling station.

[0068] In combination Figure 9 Specifically, the fin conveying line 100 includes an upstream conveying line 110 and a downstream conveying line 120, the upstream conveying line 110 includes a plurality of rollers 111 arranged at intervals along the conveying direction of the upstream conveying line 110, each roller 111 is connected with a motor, and the roller 111 is driven to roll by the motor to realize the conveying of the fin stack 300.

[0069] The downstream conveying line 120 comprises a conveying drive and a conveying belt, the conveying belt is driven to move by the conveying drive, thereby achieving the purpose of conveying the fin stack 300 between various workstations, when the fin stack 300 is conveyed to the corresponding processing workstation, the conveying drive is stopped, and after the processing is completed, the conveying drive is started to continue conveying to the next workstation.

[0070] The fin accessing device 400 is arranged at the end of the fin conveying line 100, and is used to transfer the fin stack 300 formed by the fins processed and formed by the aluminum sheet uncoiler and the punching machine to the fin conveying line 100, and the fin stack 300 passes through each subsequent process to form a heat exchanger or an evaporator.

[0071] The end plate mounting station and the pipe inserting station are arranged on the upstream conveying line 110, and the nitrogen filling station is arranged on the downstream conveying line 120.

[0072] The pipe expanding device 130 and the drying device 140 are further arranged between the upstream conveying line 110 and the downstream conveying line 120, and the fin stack 300 is conveyed between the upstream conveying line 110 and the pipe expanding device 130, between the pipe expanding device 130 and the drying device 140, and between the drying device 140 and the downstream conveying line 120 by the transfer robot 150.

[0073] The pipe bending station, the welding station and the helium filling station are further arranged on the downstream conveying line 120, the pipe bending station is arranged upstream of the nitrogen filling station, and the welding station and the helium filling station are arranged downstream of the nitrogen filling station in sequence along the conveying direction of the downstream conveying line 120.

[0074] Since the downstream conveying line 120 is controlled by the start-stop control of the conveying drive, the arrangement positions of the various stations need to meet that in the stop state, the corresponding processing operation can be performed on each station, and when conveying, the corresponding fin stack 300 is synchronously conveyed to the next processing station.

[0075] Next, the processing devices involved will be described in detail.

[0076] Reference Figures 2-4 The fin accessing device 400 comprises an accessing support 410, a supporting bottom plate 420, a lifting support plate 430 and a offline robot 450, the accessing support 410 is a frame structure as a whole, and a storage position is formed in the accessing support 410, the supporting bottom plate 420 is horizontally arranged on the accessing support 410, and specifically, at the bottom of the storage position formed in the accessing support 410.

[0077] The supporting bottom plate 420 is vertically provided with a blanking pin 310, the bottom of the blanking pin 310 is fixed on the supporting bottom plate 420, and the top of the blanking pin 310 is vertically arranged upward, and is used for blanking and positioning the fin falling into the storage position after processing and forming.

[0078] The length direction of the fin is defined as the first direction, the width direction of the fin is defined as the second direction, and the thickness direction of the fin is defined as the third direction. Along the second direction, a plurality of fin stacks 300 are formed in the storage position, and each group of fin stacks 300 includes a plurality of fins stacked on the blanking needle 310 along the third direction.

[0079] In combination Figure 6 The offline robot 450 is used to transfer each group of fin stacks 300 to the upstream conveying line 110.

[0080] The lifting support plate 430 is arranged in parallel above the support bottom plate 420 and is movably connected to the access support 410 along the third direction. The lifting support plate 430 is provided with a through hole 432, and the fin is provided with a penetrating insertion hole. The blanking needle 310 is connected to the corresponding insertion hole through the through hole 432.

[0081] The access support 410 is provided with a lifting cylinder 440, the output end of the lifting cylinder 440 is connected to the lifting support plate 430, and the lifting cylinder 440 is used to drive the lifting support plate 430 to move along the height direction of the access support 410.

[0082] When the lifting support plate 430 moves up and down along the third direction, the blanking needle 310 is fixed, and the insertion hole and the through hole 432 move up and down relative to the blanking needle 310.

[0083] After the fin stack 300 is formed in the storage position, a positioning needle 320 is arranged on the fin stack 300.

[0084] The positioning needle 320 is arranged in the reserved insertion hole, one end of the positioning needle 320 is supported on the lifting support plate 430, and the other end extends above the fin stack 300.

[0085] The position corresponding to the positioning needle 320 on the lifting support plate 430 is not designed with a through hole 432. With the up and down movement of the lifting support plate 430, the positioning needle 320 also moves, and always connects each fin in the same group of fin stacks 300 together.

[0086] The offline robot 450 specifically includes an offline robot body 451 and an offline clamp 452, and the offline clamp 452 is arranged on the offline robot body 451.

[0087] The offline robot body 451 includes an offline robot base 4511, an offline robot large arm 4512, and an offline robot small arm 4513 connected in sequence.

[0088] In addition, the offline robot 450 further comprises a robot motor and a vision camera, wherein the offline robot base 4511 is fixed to the ground by bolts, the robot motor is connected to the offline robot 450 by bolts from the offline robot base 4511, the offline robot base 4511, the offline robot large arm 4512 and the offline robot small arm 4513 are connected by sliding joints, and the vision camera is arranged on the offline clamp 452 and used to acquire position information of the finned pile 300.

[0089] Reference Figures 7-9 The offline clamp 452 comprises a first offline clamping piece 4521 and a second offline clamping piece 4522 arranged symmetrically, and the first offline clamping piece 4521 and the second offline clamping piece 4522 are respectively provided with clamping portions for clamping two ends of the positioning needle 320.

[0090] The offline robot 450 is configured to clamp two ends of the finned pile 300 on the lifting support plate 430 and transfer them to a target position, that is, clamp the finned pile 300 to the upstream conveying line 110.

[0091] Along the length direction of each fin, at least one positioning needle 320 is inserted at each end of the finned pile 300, the bottom of the positioning needle 320 is in contact with the lifting support plate 430, the top of the positioning needle 320 extends to the upper end of the finned pile 300, and the first offline clamping piece 4521 and the second offline clamping piece 4522 are respectively used to clamp the upper end of the positioning needle 320 and the lower end of the positioning needle 320.

[0092] The first offline clamping piece 4521 and the second offline clamping piece 4522 are respectively connected to the end of the offline robot small arm 4513 through clamping power pieces, the first offline clamping piece 4521 comprises two first offline clamping jaws arranged at intervals, the second offline clamping piece 4522 comprises two second offline clamping jaws arranged at intervals, the first offline clamping jaws are used to clamp the upper end of the positioning needle 320, and the second offline clamping jaws are used to clamp the lower end of the positioning needle 320.

[0093] The number of clamping power pieces can be two, and each clamping power piece comprises an output end connected to the first offline clamping jaws and the second offline clamping jaws respectively.

[0094] Alternatively, the number of clamping power pieces is one, and the clamping power piece is provided with two output ends located on both sides of the clamping power piece and connected to the first offline clamping jaws and the second offline clamping jaws respectively.

[0095] The first offline clamping jaws and the second offline clamping jaws are respectively connected to the clamping power pieces through adapter plates 4523, that is, the output ends of the clamping power pieces are connected to the adapter plates 4523, and the first offline clamping jaws and the second offline clamping jaws are respectively connected and fixed to the adapter plates 4523 on the corresponding side.

[0096] The first lower line clamp jaw is formed with a first positioning clamp plate perpendicular to the adapter plate 4523, and the first positioning clamp plate is formed with at least one first positioning recess with an opening facing the second lower line clamp jaw.

[0097] The second lower line clamp jaw is formed with a second positioning clamp plate 4524 perpendicular to the adapter plate 4523, and the second positioning clamp plate 4524 is formed with at least one second positioning recess 4525 with an opening facing the first lower line clamp jaw.

[0098] In the clamped state, the upper end of the positioning needle 320 is inserted into the first positioning recess, and the lower end of the positioning needle 320 is inserted into the second positioning recess 4525.

[0099] The first lower line clamp jaw further comprises a first connecting plate, which is arranged perpendicularly to the first positioning clamp plate, and the first positioning clamp plate is detachably connected to the adapter plate 4523 through the first connecting plate.

[0100] The second lower line clamp jaw further comprises a second connecting plate 4527, which is arranged perpendicularly to the second positioning clamp plate 4524, and the second positioning clamp plate 4524 is detachably connected to the adapter plate 4523 through the second connecting plate 4527.

[0101] The first connecting plate and the first positioning clamp plate are an integral structure, the second connecting plate 4527 and the second positioning clamp plate 4524 are an integral structure, and a reinforcing rib 4528 is arranged between the first connecting plate and the first positioning clamp plate and between the second connecting plate 4527 and the second positioning clamp plate 4524, respectively, to improve the connection strength between the first connecting plate and the first positioning clamp plate and between the second connecting plate 4527 and the second positioning clamp plate 4524.

[0102] The end of the second positioning clamp plate 4524 corresponding to the lower end of the fin stack 300 is formed with a guide slope 4526, which is used to lift the bottommost fin of the fin stack 300 and guide the lower end of the positioning needle 320 into the second positioning recess 4525 during the movement of the second lower line clamp jaw to the bottom of the fin stack 300.

[0103] In order to facilitate the clamping of the second positioning clamp plate 4524, in some embodiments of the present application, the lifting support plate 430 is formed with an upwardly extending support protrusion 431, and the length of the support protrusion 431 along the first direction is less than the length of the fin.

[0104] Each fin stack 300 is supported on the support protrusion 431, and under the action of the support protrusion 431, a clamping gap is formed between the bottom of each fin stack 300 and the lifting support plate 430, and the second lower line clamp 4522 moves from the clamping gap to the bottom of the fin stack 300 to clamp the positioning needle 320.

[0105] In order to avoid interference between the adapter plate 4523 on the second positioning clamp plate 4524 and the support protrusion 431 during clamping, the length of the second connecting plate 4527 is designed to extend downward, so that during clamping of the second positioning clamp plate 4524, the adapter plate 4523 is located above the support protrusion 431, avoiding interference.

[0106] End plate installation device 500

[0107] Reference Figures 10-11 The end plate installation device 500 is adapted to the end plate installation position on the fin conveying line 100.

[0108] The end plate installation device 500 includes an end plate installation robot 510 and a lifting stopper 520. The end plate installation robot 510 is symmetrically arranged on both sides of the fin conveying line 100, and is used to simultaneously install end plate pieces 330 on both ends of the fin stack 300.

[0109] Each end plate installation robot 510 includes an end plate robot body 511, a connecting beam 512, a clamping power element, and two end plate clamps 513. The connecting beam 512 is installed on the short plate robot body, the clamping power element is installed on the connecting beam 512, and the two end plate clamps 513 are arranged on the clamping power element. Under the action of the clamping power element, the two end plate clamps 513 move relative to or towards each other to clamp or release the end plate piece 330.

[0110] The clamping power element is formed with a first telescopic end and a second telescopic end along the length direction of the connecting beam 512, and the two end plate clamps 513 are respectively installed on the first telescopic end and the second telescopic end.

[0111] Alternatively, in other embodiments, the clamping power element corresponds to the end plate clamp 513 one-to-one, and two clamping power elements are symmetrically arranged on the connecting beam 512, and the end plate clamp 513 is installed on the output end of the clamping power element.

[0112] The end plate installation position is formed on the fin conveying line 100, and the stopper 522 is located downstream of the end plate installation position. When the fin stack 300 is conveyed to the end plate installation position along the fin conveying line 100, the stopper 522 rises above the roller 111.

[0113] The lifting stopper 520 is arranged on the fin conveying line 100, and before the fin stack 300 is conveyed to the end plate installation position, the lifting stopper 520 is lifted to stop the fin stack 300.

[0114] The lifting stopper 520 specifically comprises a lifting driving member 521 arranged below the fin conveying line 100 and a stopper 522 installed at the output end of the lifting driving member 521, which is lifted between the corresponding adjacent rollers 111 on the fin conveying line 100 under the action of the lifting driving member 521, and is used for stopping and correcting the fin stacks 300 at the corresponding positions on the fin conveying line 100.

[0115] The stopper 522 comprises two or more than two stop blocks 5221 arranged along the axial direction of the roller 111, both of which are connected with the output end of the lifting driving member 521, and the lifting driving member 521 drives the two stop blocks 5221 to rise at the same time, and when the fin stack 300 is conveyed to the end plate mounting position, the two stop blocks 5221 are lifted above the roller 111 to stop the forward conveying of the fin stack 300.

[0116] When the fin stack 300 is angularly inclined with the roller 111, the stop block 5221 can straighten the fin stack 300 to be parallel to the axial direction of the roller 111, facilitating the installation of the end plate member 330 by the end plate mounting robot.

[0117] The end plate mounting robot 510 forms an end plate clamping position between the two end plate clamps 513, and a pushing member 514 extending towards the end plate clamping position is arranged on the connecting beam 512, which comprises a pushing power member fixed on the connecting beam 512 and a pushing end portion fixed on the output end of the pushing power member.

[0118] The fin conveying line 100 is also provided with a supporting plate member 112, on which the fin stack 300 is placed, and a jacking member 530 is arranged upstream of the lifting stopper 520, which comprises a jacking cylinder and a jacking block, the jacking cylinder is arranged below the end plate mounting position, and the jacking block is installed at the output end of the jacking cylinder, which is lifted between the corresponding rollers 111 under the action of the jacking cylinder, and is used for jacking up the supporting plate conveyed to the jacking block mounting position.

[0119] The conveying direction of the fin conveying line 100 is defined as the X direction, the width direction of the fin conveying line 100 is defined as the Y direction, and the height direction of the fin conveying line 100 is defined as the Z direction, the dimension of the end plate member 330 along the Z direction is the width of the end plate member 330, the dimension of the fin stack 300 along the Z direction is the width of the fin stack 300, the width L1 of the end plate member 330 is greater than the width L2 of the fin stack 300, and the thickness L3 of the supporting plate member 112 satisfies L3>(L1-L2) / 2, so as to avoid interference between the end plate member 330 and the roller 111 when the end plate member 330 is installed on both ends of the fin stack 300.

[0120] A detection member 550 is further arranged upstream of the end plate mounting position, and is specifically arranged on the support frame 200 and located at one side of the roller 111. The detection member 550 is connected with the controller 800, and the controller 800 is signal connected with the lifting driving member 521 and the jacking cylinder. The controller 800 is used for receiving the detection signal of the detection member 550 and controlling the movement of the lifting driving member 521 and the jacking cylinder.

[0121] The controller 800 is the control center of the whole processing line, and is used for controlling the start and stop of the fin conveying line 100, the work of each robot, and the on-off of each device. The control process is prior art and will not be described in detail.

[0122] In other embodiments, the fin conveying line 100 is further provided with a centering assembly 540. The centering assembly 540 includes two centering beams 541 symmetrically arranged on the fin conveying line 100. The centering beams 541 are located downstream of the end plate mounting position, and a centering channel is formed between the centering beams 541 for centering the support plate to the middle position of the fin conveying line 100.

[0123] Each centering beam 541 is provided with a guide section 542 at one end close to the end plate mounting position. A guide channel is formed between the two guide sections 542 and gradually shrinks along the conveying direction of the fin stack 300.

[0124] The centering beams 541 are fixed to the support frame 200 through a centering bracket 543. The height of the centering beams 541 is lower than that of the positioning pins 320 on the fin stack 300.

[0125] After the end plate mounting is completed, the stop block 5221 on the lifting stop 520 is lowered, and the fin stack 300 continues to convey downward along the fin conveying line 100.

[0126] After the end plate members 330 at both ends of the fin stack 300 pass through the guide channel, the fin stack 300 moves to the middle position of the fin conveying line 100 under the action of the guide section 542. This improves the position accuracy of the fin stack 300 during conveying, and facilitates the operation of the subsequent pipe inserting robot 610.

[0127] The opposite sides of the two end plate clamps 513 are respectively provided with a plurality of limiting protrusions. The limiting protrusions between each end plate clamp 513 form a clamping position for limiting the end plate member 330. During clamping, the end of the end plate member 330 is located between the limiting protrusions, and the position of the end plate member 330 is limited to prevent the end plate member 330 from falling off the end plate clamp 513.

[0128] Reference Figures 13-16 Similar to the offline robot body 451, the end plate robot body 511 includes an end plate robot base, an end plate robot large arm, and an end plate robot small arm connected in sequence.

[0129] In addition, the end plate robot also comprises a robot motor and a vision camera, wherein the end plate robot base is fixed to the ground by bolts, the robot motor is connected to the end plate robot base by bolts, the end plate robot base, the end plate robot large arm and the end plate robot small arm are connected through sliding joints, and the vision camera is arranged on the end plate clamp 513 and used to acquire position information of the fin stack 300 and the positioning needle 320.

[0130] The end plate piece 330 is also provided with through holes corresponding to the fins, the end plate piece 330 is inserted into the positioning needle 320 through the corresponding through holes, after the insertion of the end plate piece 330 is completed, the pushing power piece drives the pushing end to push the end plate piece 330 forward, and the two side end plate pieces 330 are pushed to the middle at the same time, in addition to installing the end plate piece 330 in place, eliminating the gap between the fins, so that the fins are connected closely.

[0131] After installation is completed, the fin stack 300 is conveyed downward along the fin conveying line 100 to a pipe inserting station.

[0132] A pipe inserting device 600 is arranged beside the pipe inserting station, the pipe inserting device 600 grabs the pipe piece 340 and inserts the pipe piece 340 into the insertion hole in the fin stack 300.

[0133] Specifically, referring to Figure 17 , Figure 18 , the pipe inserting device 600 comprises a pipe inserting robot 610, the pipe inserting robot 610 comprises a pipe inserting robot body 611 and a pipe inserting clamp 612, the pipe inserting clamp 612 is connected to the pipe inserting robot body 611 and comprises two pipe inserting assemblies arranged at intervals, each pipe inserting assembly comprises a middle connecting portion 613 and at least one pipe grabbing clamp 614 arranged on the middle connecting portion 613, the pipe inserting device 600 grabs the pipe piece 340 through the pipe grabbing clamp 614 and inserts the pipe piece 340 into the fin stack 300 under the driving of the pipe inserting robot body 611.

[0134] In addition, the pipe inserting robot 610 also comprises a robot motor and a vision camera, wherein the pipe inserting robot base is fixed to the ground by bolts, the robot motor is connected to the pipe inserting robot base by bolts, the pipe inserting robot base, the pipe inserting robot large arm and the pipe inserting robot small arm are connected through sliding joints, and the vision camera is arranged on the pipe inserting clamp 612 and used to acquire position information of the fin stack 300 and the insertion hole.

[0135] Each pipe clamp 614 comprises a clamp cylinder 6141 and a clamp head 6142, the clamp cylinder 6141 is formed with a first telescopic end and a second telescopic end, and the clamp head 6142 is provided on the first telescopic end and the second telescopic end respectively, each clamp head 6142 is formed with a clamp recess 6144, and the pipe member 340 is clamped in the clamp position formed by the two clamp recesses 6144.

[0136] The pipe member 340 is in a U-shaped structure, and the two ends of the pipe member 340 are inserted into the corresponding insertion holes of the fin stack 300. In order to improve the stability of clamping the pipe member 340, each pipe insertion clamp 612 comprises two pipe clamps 614 arranged at intervals, and the pipe clamps 614 on each pipe insertion clamp 612 are used to clamp one side of the pipe member 340 for insertion.

[0137] At least two pipe insertion devices 600 are arranged at intervals along the conveying direction of the fin conveying line 100 to improve the insertion efficiency of the pipe member 340.

[0138] In addition to inserting the pipe member 340, the pipe insertion robot 610 can also disassemble the positioning needle 320. For example, but not limited to, after the upstream pipe insertion robot 610 inserts part of the pipe member 340, the fin stack 300 is conveyed to the corresponding position of the downstream pipe insertion robot 610, and the downstream pipe insertion robot 610 disassembles the positioning needle 320 first and then inserts the remaining pipe member.

[0139] When the positioning needle 320 is disassembled, the pipe insertion robot arm of the pipe insertion robot 610 can be rotated by 90 degrees, and only one pipe clamp 614 is used to disassemble a single positioning needle 320.

[0140] The movement of the pipe insertion robot arm is prior art and is not the focus of the design of the present application, and will not be described here.

[0141] After the pipe insertion is completed, the fin stack 300 continues to be conveyed downward to the pipe expanding station, and the pipe member 340 is subjected to pipe expanding operation by the pipe expanding device 130.

[0142] After the pipe expanding is completed, the fin stack 300 is transferred from the fin conveying line 100 to the drying device 140 by the transfer robot 150 for drying operation, and after the drying is completed, the fin stack 300 is continuously transferred to the downstream conveying line 120 by the transfer robot 150.

[0143] Reference Figure 19The transfer robot 150 comprises a transfer robot body and a transfer clamp arranged on the transfer robot body, the transfer clamp comprising a transfer middle beam 151 connected to the transfer robot body, a transfer driving member 152 installed on the transfer middle beam 151, and two transfer clamping plates 153 arranged on the first and second retractable ends of the transfer driving member 152 respectively, the transfer clamping plates 153 being used to clamp the end plate members 330 at both ends of the fin stack 300.

[0144] On the downstream conveying line 120, the fin stack 300 is connected by a pipe bending device 160, specifically, the pipe bending device 160 is a pipe bending robot, which has a structure similar to that of the pipe inserting robot 610, and the pipe bending robot clamps the U-shaped pipe and is inserted into the pipe member 340 on the fin stack 300 through mechanical vision positioning.

[0145] It should be noted that when the heat exchanger is an outdoor heat exchanger, it needs to be bent into an L shape in the last step, so when inserting the pipe, the two fin ends of the bent outdoor heat exchanger have a certain height difference, so the pipe needs to be inserted at a certain angle; for the evaporator, it does not need to be bent, so the two aluminum sheets that make up the evaporator do not have a height difference, and the pipe does not need to be inserted at an angle.

[0146] When the outdoor heat exchanger is inserted into the pipe, the pipe inserting clamp 612 of the pipe inserting robot 610 is automatically inclined at a preset angle by the pipe inserting robot arm, and the pipe is inserted into the pipe member 340.

[0147] After the fin stack 300 is installed with the bent pipe, it is conveyed downward to a nitrogen filling station for nitrogen filling operation.

[0148] Reference Figures 20-25 The nitrogen filling device 700 comprises a nitrogen filling device 710, a nitrogen filling butt joint 720, and a nitrogen filling robot 730, the nitrogen filling device 710 being provided with a nitrogen filling pipeline 711 outside, the nitrogen filling butt joint 720 being arranged at the end of the nitrogen filling pipeline 711, and the nitrogen filling butt joint 720 being formed with a butt joint channel gradually expanding away from the nitrogen filling pipeline 711.

[0149] The nitrogen filling robot 730 comprises a nitrogen filling robot body 731 and a nitrogen filling clamp 732, the nitrogen filling robot 730 being arranged beside the nitrogen filling station on the fin conveying line 100, the nitrogen filling clamp 732 being arranged on the nitrogen filling robot 730, and the nitrogen filling clamp 732 being configured to clamp the nitrogen filling butt joint 720 and the pipe member 340 on the fin stack 300 to fill nitrogen into the pipe member 340.

[0150] In some embodiments, the nitrogen filling device 710 is arranged in the nitrogen filling room 740, and the nitrogen filling room 740 is provided with a mounting port, and the nitrogen filling pipeline 711 extends from the mounting port to the outside of the nitrogen filling room 740.

[0151] The nitrogen filling room 740 is supported by the legs directly above the nitrogen filling station, the mounting port is arranged on the bottom wall of the nitrogen filling room 740, the nitrogen filling pipeline 711 extends out from directly below the nitrogen filling room 740, and the nitrogen filling connector 720 is connected to the nitrogen filling pipeline 711.

[0152] With reference to the specific embodiments of the present application, Figure 23 , Figure 24 In some embodiments of the present application, the nitrogen filling connector 720 is detachably connected to the nitrogen filling pipeline 711, and the end of the nitrogen filling connector 720 connected to the nitrogen filling pipeline 711 is provided with a connecting end portion, an internal thread is formed on the inner wall of the connecting end portion, and an external thread is formed on the end of the nitrogen filling pipeline 711, and the nitrogen filling pipeline 711 is threadedly connected in the connecting end portion.

[0153] During the nitrogen filling process, the nitrogen filling robot 730 clamps the nitrogen filling pipeline 711 above the nitrogen filling connector 720, and pulls the nitrogen filling pipeline 711 downward to the pipeline piece 340, the pipeline piece 340 is guided into the nitrogen filling pipeline 711 through the nitrogen filling connector 720, and is connected to the nitrogen filling pipeline 711, and then the nitrogen filling device 710 delivers nitrogen into the pipeline piece 340.

[0154] In order to accurately guide the pipeline piece 340 into the nitrogen filling pipeline 711, the minimum inner diameter size of the connecting channel is not greater than the inner diameter size of the nitrogen filling pipeline 711.

[0155] With reference to the specific embodiments of the present application, Figure 25 In other embodiments, the nitrogen filling connector 720 is integrally formed with the nitrogen filling pipeline 711, and the nitrogen filling connector 720 is entirely in the shape of a horn.

[0156] With reference to the specific embodiments of the present application, Figure 26 In other embodiments, in order to automatically reset the nitrogen filling pipeline 711 upward after the nitrogen filling, a resilient member 750 is arranged between the nitrogen filling pipeline 711 and the nitrogen filling room 740, one end of the resilient member 750 is fixed to the inner wall of the nitrogen filling room 740, the other end is connected to the nitrogen filling pipeline 711 arranged in the nitrogen filling room 740, the resilient member 750 is compressed when the nitrogen filling pipeline 711 moves outward to the state of abutting against the pipeline piece 340, and under the restoring force of the resilient member 750, the nitrogen filling pipeline 711 is lifted to reset when the nitrogen filling is completed.

[0157] In other embodiments, an elastic member 750 is arranged between the nitrogen charging pipeline 711 and the nitrogen charging room 740, one end of the elastic member 750 is fixed outside the mounting port, and the other end is connected to the nitrogen charging pipeline 711 outside the nitrogen charging room 740. When the nitrogen charging pipeline 711 moves outward to the state of being connected with the pipeline member 340, the elastic member 750 is stretched, and after the nitrogen charging is completed, the nitrogen charging robot 730 releases the nitrogen charging pipeline 711, and the elastic member 750 drives the nitrogen charging pipeline 711 to move upward and reset under the restoring force of itself.

[0158] In other embodiments, an elastic pipe section is formed on the nitrogen charging pipeline 711, which is used to realize the telescopic extension of the nitrogen charging pipeline 711 relative to the mounting port.

[0159] The elastic pipe section is at least one section of the nitrogen charging pipeline 711, which is elongated in the nitrogen charging state, and is retracted under the elastic force of itself after the nitrogen charging is completed, so as to realize the upward reset of the nitrogen charging connecting member 720.

[0160] The nitrogen charging clamp 732 includes a clamping driving member and a clamping jaw assembly 733 connected with the clamping driving member, the clamping jaw assembly 733 includes symmetrically arranged first clamping jaws 7331 and second clamping jaws 7332, and clamping recesses 7333 are formed on the first clamping jaws 7331 and the second clamping jaws 7332, the size of the clamping recesses 7333 is matched with the outer diameter of the nitrogen charging pipeline 711, and the nitrogen charging pipeline 711 is used to be clamped between the clamping recesses 7333.

[0161] The specific connection of the clamping driving member with the first clamping jaws 7331 and the second clamping jaws 7332 and the realization of the first clamping jaws 7331 and the second clamping jaws 7332 are the prior art, which will not be described here.

[0162] Similarly, the nitrogen charging robot body 731 also includes a nitrogen charging robot body 731 including a nitrogen charging robot 730 base, a nitrogen charging robot 730 large arm and a nitrogen charging robot 730 small arm connected in sequence.

[0163] In addition, the nitrogen charging robot 730 also includes a robot motor and a vision camera, wherein the nitrogen charging robot 730 base is fixed on the ground by bolts, the robot motor is connected to the nitrogen charging robot 730 base by bolts, the nitrogen charging robot 730 base, the nitrogen charging robot 730 large arm and the nitrogen charging robot 730 small arm are connected through sliding joints, and the vision camera is arranged on the nitrogen charging clamp 732 and used to acquire the position information of the fin stack 300 and the positioning needle 320.

[0164] After the nitrogen charging is completed, the fin conveying line 100 drives the fin stack 300 to be conveyed forward to a welding station for welding, and then to a helium detection station for welding state detection.

[0165] When the heat exchanger is an outdoor heat exchanger, after the helium detection is completed, the fin stack 300 needs to be bent by the bending device 190, and finally the heat exchanger is formed.

[0166] Next, the specific steps of processing the fin stack 300 into a heat exchanger are described as follows:

[0167] First, place the uncoiled aluminum sheet on the uncoiler frame of the aluminum sheet uncoiler, and place the end of the coiled aluminum sheet between the uncoiling rollers. Then start the motor, and the aluminum sheet is uncoiled and connected to the punch press.

[0168] In the punch press, various processes are carried out. The first step is straightening and oiling. After the strip is straightened by the roller group, it enters the oil tank. A pair of roller shafts are provided at the outlet of the oil tank to remove dust and excess oil on the surface of the strip, so that a uniform oil film is formed on the surface of the material, which facilitates lubrication and stamping of the mold.

[0169] The second step is to pull the material. The pulling mechanism is designed integrally with the main machine. The rotation of the punch spindle is connected to the mold through a toothed belt, a toothed wheel shaft, a slide plate, a pull rod, a rocker plate, a pulling shaft, to ensure that the pulling and the main shaft stamping move synchronously. Adjusting the length of the slide plate and the pull rod can accurately set the pitch of the pulling. The third step is to cut and count. The cutting is performed by the upper and lower cutting blades and the cylinder controlled by the non-contact cam controller 800, and the number of actions is recorded. The last step is to drop the material to the designated position.

[0170] After the mold in the punching machine is stamped, the heat exchanger fins are punched out. The length of the fin is between 500mm and 1000mm, the width is between 50mm and 100mm, the thickness is between 0.2mm and 0.5mm, and the fin spacing is between 8mm and 12mm. The size can follow the size of the mold.

[0171] The punching process of the punching machine is prior art, and is not the focus of the design of the present application. In view of the integrity of the technical solution, it is simply described here.

[0172] Insert the positioning needle into the fin stack 300. After inserting the positioning needle 320, the offline robot 450 is started. The offline robot 450 mechanical arm stops at the specified position, clamps the two ends of the positioning needle 320, and then the offline robot large arm 4512 moves the offline robot small arm 4513 and places it on the fin conveying line 100.

[0173] After that, end plate pieces 330 are installed at both ends of fin stack 300, when end plate pieces 330 are installed, the end plate robot large arm drives the end plate robot small arm to clamp the end plate from behind through end plate clamp 513, then the vision camera on the end plate robot takes a photo, the vision camera identifies the position of locating pin 320 and the insertion hole, after being processed by the processor, end plate piece 330 is lifted to the appropriate height and aligned with the side of fin stack 300, end plate piece 330 is inserted into fin stack 300 with locating pin 320, end plate clamp 513 is unloaded, then the end part is slowly pushed out to push end plate piece 330 in.

[0174] For the transportation of the heat exchanger, the existing scheme is to clamp both sides of the heat exchanger, but the holding of the clamping force is not strict during clamping, so the present application clamps the end plates of the heat exchanger, which better ensures the shape of the heat exchanger;

[0175] Fin conveying line 100 transports fin stack 300 to the next process position, the clamp used by pipe insertion robot 610 is consistent with the locating pin 320 robot, first, the robot clamps the pipe piece 340 from the rear raw material area, then the robot clamp moves to the vicinity of both sides of the heat exchanger, the vision camera takes a photo, according to the positioning method and the holding method of the clamping force described above, pipe piece 340 is slowly inserted into the heat exchanger, after the insertion is completed, the clamp is unloaded, and the above process is repeated;

[0176] After the pipe insertion process is completed, pipe insertion robot 610 will pull out locating pin 320 from the heat exchanger, at this time, the inserted pipe piece 340 will replace locating pin 320 to position and constrain the aluminum sheet of the heat exchanger, and also limit the movement in the X-axis direction, the Y-axis direction, rotation around the X-axis, rotation around the Y-axis and rotation around the Z-axis.

[0177] After locating pin 320 is pulled out by pipe insertion robot 610, pipe insertion robot 610 will clamp pipe piece 340 from the raw material area, and the above process will be repeated to insert pipe piece 340 into the insertion hole from which locating pin 320 is pulled out.

[0178] After the pipe insertion is completed, transfer robot 150 transports the heat exchanger to the pipe expansion station to perform the pipe expansion process.

[0179] The pipe expansion machine is a special equipment for tightly fixing the pipe plate of metal pipes, which is widely used in the fields of refrigeration, heat exchanger, boiler, etc. The core principle is to expand the pipe material through mechanical or hydraulic method, so that plastic deformation is generated between the pipe material and the hole wall of the pipe plate, forming an interference fit, so as to ensure the sealing and the connection strength. The present application adopts a hydraulic pipe expansion machine, and the working principle is to inject hydraulic oil into the inside of the pipe material, and uniformly expand the pipe wall through the liquid pressure, so that it is attached to the pipe plate hole, and the pressure value can be accurately controlled. The hydraulic range used by the hydraulic pipe expansion machine this time is 150-250 bar.

[0180] First, the hydraulic head of the expander is inserted into the pipe, and positioned to the pipe plate hole position. Then, start the hydraulic pump, inject high pressure oil into the pipe, and the pipe wall is uniformly expanded to fit the pipe plate hole. After the expansion, the hydraulic expander needs to be depressurized and the hydraulic head is extracted.

[0181] Expansion rate calculation:

[0182] Expansion rate = (D expanded - D expanded) / D expanded x 100%

[0183] Usually controlled at 3%~8%, to avoid over-expansion leading to thinning or rupture of the pipe wall.

[0184] After the expansion process is completed, the transfer robot 150 transfers the fin stack 300 to the drying station for drying.

[0185] The dryer starts to run, and the function of the dryer is to dry the lubricating oil in the heat exchanger. If the lubricating oil is not dried, it may evaporate into the air and cause harm to the human body when used later;

[0186] First, the dryer pre-cleans the heat exchanger with warm water spray, which is to remove the large particles of lubricating oil attached to the surface first, reducing the burden of main degreasing, and then performing main degreasing treatment: 1. Spray degreasing: the spray system uniformly covers the workpiece surface with a pressure of 0.3-0.8 MPa, and the time is 5-15 minutes. 2. Temperature control: the degreasing tank is heated to 50-70℃ (alkaline degreasing). 3. Circulating filtration: the degreasing solution is recycled after removing impurities by filter screen or centrifuge, prolonging the service life;

[0187] After degreasing, multi-stage rinsing is carried out, the first stage of rinsing uses hot water (60-80℃) to rinse the remaining degreasing agent to avoid crystallization. The second rinsing uses normal temperature water to further remove trace residues, ensuring neutral pH value. Then dry treatment is carried out, using hot air drying, 80-120℃ hot air quickly blows dry the parts to prevent water stains.

[0188] After the drying process is completed, the fin stack 300 is sent out from the tail end of the drying machine with the fin conveying line 100, and at this time another transfer robot 150 completes the offline process of the fin stack 300 according to the above process.

[0189] The next process is to insert the elbow, and there is a difference between the outdoor heat exchanger and the indoor heat exchanger. For the outdoor heat exchanger, it needs to be bent in the last step, so in the elbow insertion process, there is a certain height difference between the aluminum sheets that make up the heat exchanger, so the elbow needs to be inserted at an angle; for the indoor heat exchanger, it does not need to be bent, so there is no height difference.

[0190] The robot for inserting the elbow pipe is the same as the pipe inserting robot 610, and the positioning method and the holding of the clamping force are consistent with the above description. When the elbow pipe is inserted, the robot clamp is set to a certain inclination because of the height difference, and the inclination is related to the height difference of the heat exchanger.

[0191] After the above process is completed, the next step is to fill nitrogen in the heat exchanger. The main purpose of the nitrogen filling in the previous step is to prevent the inner wall of the pipe fitting 340 from generating oxide scale at high temperature. Nitrogen is very stable in chemical properties, which can isolate the pipe fitting 340 from oxygen, thereby preventing the pipe fitting 340 from oxidizing during the welding process to generate oxides.

[0192] The vision camera on the nitrogen filling robot 730 takes a photo of the fin stack 300 to determine the position of the pipe fitting 340 that needs to be filled with nitrogen. Then, the nitrogen filling clamp 732 clamps the nitrogen filling pipe 711, which is pulled down. The nitrogen filling pipe 711 is connected to the pipe fitting 340. The nitrogen filling pipe 711 is telescopic, and the nitrogen filling butt joint 720 is aligned with the pipe fitting 340. Then, the nitrogen filling is performed. After the nitrogen filling is completed, the nitrogen filling clamp 732 takes out the clamped nitrogen filling pipe 711 from the pipe fitting 340.

[0193] The heat exchanger continues to be transported to the automatic welding device 170 by the conveying belt. During the above-mentioned pipe inserting process, the pipe has self-contained solder. Only 3-5 seconds of welding is required at the automatic welding device 170 to melt the solder. The temperature control range is 180°-250° under the control of the automatic welding device 170 control cabinet.

[0194] After the welding is completed, the next process of helium detection is performed. Before the helium detection, the protective gas nitrogen filled in the previous process is first extracted, and then helium is injected. This process is consistent with the above-mentioned nitrogen filling process.

[0195] Helium is an inert gas commonly used for detection. Because the helium molecule is small, it can easily pass through narrow gaps. A helium mass spectrometer is provided in the helium detection room to monitor the change in helium concentration in the surrounding environment, and a sensor is provided to accurately locate the leakage point.

[0196] After the helium detection, the outdoor heat exchanger still needs to be bent. The bending machine drives the fin stack 300 to rotate by 90° to bend the heat exchanger into an L shape. Thus, the heat exchanger production process is completed.

[0197] As long as possible, the various aspects and features described and illustrated in the specification can be applied individually, and these individual aspects can be the subject of a divisional application.

[0198] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0199] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A nitrogen-filling device, characterized in that, include: Nitrogen purging device, with an external nitrogen purging pipeline; A nitrogen-filling connector is disposed at the end of the nitrogen-filling pipeline, and a connecting channel that gradually widens away from the nitrogen-filling pipeline is formed inside the nitrogen-filling connector. A nitrogen-filling robot includes a nitrogen-filling robot body and a nitrogen-filling fixture. The nitrogen-filling robot is set next to the nitrogen-filling station on the fin conveyor line. The nitrogen-filling fixture is set on the nitrogen-filling robot and is configured to clamp the nitrogen-filling docking part and dock it with the pipeline part on the fin stack to fill the pipeline part with nitrogen gas.

2. The nitrogen filling equipment according to claim 1, characterized in that, The nitrogen filling connector is detachably connected to the nitrogen filling pipeline. One end of the nitrogen filling connector connected to the nitrogen filling pipeline is provided with a connecting end. An internal thread is formed on the inner wall of the connecting end. An external thread is formed at the end of the nitrogen filling pipeline. The nitrogen filling pipeline is threadedly connected to the connecting end.

3. The nitrogen filling device according to claim 1, characterized in that, The nitrogen filling connector is integrally formed with the nitrogen filling pipeline, and the nitrogen filling connector is generally horn-shaped.

4. The nitrogen filling device according to claim 1, characterized in that, The minimum inner diameter of the docking channel is not greater than the inner diameter of the nitrogen-filling pipeline.

5. The nitrogen filling device according to claim 1, characterized in that, The nitrogen filling device is installed inside the nitrogen filling chamber, which has an installation port, and the nitrogen filling pipeline extends from the installation port to the outside of the nitrogen filling chamber.

6. The nitrogen filling device according to claim 5, characterized in that, An elastic element is provided between the nitrogen filling pipeline and the nitrogen filling chamber. One end of the elastic element is fixed to the inner wall of the nitrogen filling chamber, and the other end is connected to the nitrogen filling pipeline located inside the nitrogen filling chamber. When the nitrogen filling pipeline moves outward to the state of docking with the pipeline component, the elastic element is compressed.

7. The nitrogen filling device according to claim 5, characterized in that, An elastic element is provided between the nitrogen filling pipeline and the nitrogen filling chamber. One end of the elastic element is fixed to the outside of the installation port, and the other end is connected to the nitrogen filling pipeline located outside the nitrogen filling chamber. When the nitrogen filling pipeline moves outward to the state of docking with the pipeline component, the elastic element is stretched.

8. The nitrogen filling equipment according to claim 5, characterized in that, The nitrogen filling pipeline has an elastic section to allow it to expand and contract relative to the installation port.

9. The nitrogen filling device according to claim 1, characterized in that, The nitrogen filling clamp includes a clamping drive and a jaw assembly connected to the clamping drive. The jaw assembly includes a first jaw and a second jaw arranged symmetrically. Both the first jaw and the second jaw have clamping recesses. The size of the clamping recesses is adapted to the outer diameter of the nitrogen filling pipeline. The nitrogen filling pipeline is used to clamp between the clamping recesses.

10. A heat exchanger production line, characterized in that, The device includes a support frame, a fin conveyor line, and the nitrogen filling equipment as described in any one of claims 1-5, wherein the fin conveyor line is disposed on the support frame and the nitrogen filling chamber is located directly above the fin conveyor line.

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