Ice maker evaporator welding jig and method

Abstract

The invention discloses an ice maker evaporator welding jig which comprises a middle template used for positioning the two ends and a bent part of an evaporation copper pipe to be welded, and an upper template and a lower template which are arranged on the upper side and the lower side of the middle template and used for pressing and positioning two ice making templates to be welded correspondingly. A plurality of heat conduction holes evenly distributed along the welding track of an evaporation copper pipe are formed in the upper die plate and the lower die plate, and a plurality of containing grooves and first positioning grooves are further formed in the inner side of the upper die plate and the inner side of the lower die plate and used for containing outwards-protruding protruding strips and V-shaped fins on the ice making die plate to be welded. After the ice maker evaporator body to be welded is positioned through the middle mold plate, the upper mold plate and the lower mold plate, the ice maker evaporator body is subjected to quick and uniform hot melting welding through the uniformly distributed heat conduction holes. The problems of inaccurate positioning in the welding process of the ice-making template and the evaporating pipe and insufficient welding, welding skips and the like after welding are solved, the qualified rate of finished products of the evaporator is effectively improved, and the ice-making effect of the evaporator is ensured.

Description

Technical Field

[0001] This invention relates to the technical field of ice maker evaporators, and specifically to a welding fixture and method for ice maker evaporators. Background Technology

[0002] An ice maker is a refrigeration device that produces ice by passing water through the surface of an evaporator and then cooling it with a refrigerant. The evaporator (such as...) Figure 4 As shown in patents 202121658295.3 and 201711144256.X, the ice-making templates in this application are made of 0.3mm thick stainless steel plates. Each ice-making template has multiple outwardly protruding V-shaped fins, and multiple outwardly protruding strips are formed between adjacent fins. The evaporating copper tube in the middle also has a serpentine curved structure. In order to ensure the cooling effect, the wall thickness of the evaporating copper tube should be as thin as possible. After the composite structure is completed, it is necessary to ensure that the evaporating copper tube passes between adjacent strips. However, when welding the two ice-making templates and the evaporator tube, the thinness of the ice-making templates and the evaporator tube often leads to problems such as the ice-making templates warping or twisting after positioning, and a section of the evaporator tube opening and tilting. This results in inaccurate positioning and uneven pressure among the three components during the final welding process, causing a section of the copper tube to deviate or resulting in localized incomplete welds, missed welds, and weak welds. This leads to a high scrap rate for the evaporator and can also affect the ice-making effect. Summary of the Invention

[0003] In order to solve one or more technical problems existing in the prior art, one of the purposes of this application is to provide a welding fixture for an ice maker evaporator, which can solve the problems of inaccurate positioning of the ice-making template and evaporator tube during the welding process and the occurrence of incomplete welding and missing welding after the welding is completed, effectively improving the finished product qualification rate of the evaporator and ensuring the ice-making effect of the evaporator.

[0004] The second objective of this application is to provide a welding method for ice maker evaporators that enables batch welding in a single operation, thereby improving production efficiency.

[0005] To address the aforementioned technical problems, one of the objectives of this application is achieved through the following technical solution: A welding fixture for an ice maker evaporator includes a middle template for positioning the two ends and bends of the copper evaporator tube to be welded, and an upper template and a lower template disposed on the upper and lower sides of the middle template for pressing and positioning two ice-making templates to be welded. The upper and lower templates are provided with a plurality of heat-conducting holes evenly distributed along the welding trajectory of the copper evaporator tube. The inner sides of the upper and lower templates are also provided with a plurality of receiving grooves and a first positioning groove for receiving the outwardly protruding ribs and V-shaped fins on the ice-making templates to be welded. After the middle template, upper template and lower template are used to position the ice maker evaporator body to be welded, the ice maker evaporator body is rapidly and uniformly hot-melt welded through the evenly distributed heat-conducting holes.

[0006] Preferably, each of the first positioning grooves is parallel and equidistant, the distance between two adjacent first positioning grooves is less than or equal to the interval between two adjacent V-shaped fins, the width of the first positioning groove is consistent with the maximum width of the welded V-shaped fin, and the V-angle of the V-shaped fin is positioned and corrected by the first positioning groove.

[0007] Preferably, the bottom of the first positioning groove is provided with several elongated first through holes.

[0008] Preferably, the bottom of the heat-conducting hole is provided with a pressure strip whose bottom contacts the ice-making template, and the bottom of the heat-conducting hole forms two symmetrical second through holes through the pressure strip.

[0009] Preferably, the upper template has two handles on its outer side, and the lower template has a support frame at its bottom.

[0010] Preferably, the middle template includes a limiting frame, a limiting hole located within the limiting frame, and limiting molds provided on the upper surfaces of both sides of the limiting frame. The corner of the limiting hole is provided with an outwardly protruding limiting corner. The lower template in the welding state is embedded in the limiting hole and positioned by the limiting corner. The limiting mold is provided with a second positioning groove, and the two ends of the copper tube to be welded and the arc-shaped bend are positioned by the second positioning groove.

[0011] Preferably, the bottom of the lower template is provided with a plurality of outwardly protruding limiting blocks, and the lower template embedded in the limiting hole is stopped by the limiting blocks.

[0012] Preferably, the lower template is provided with a plurality of upwardly protruding pins, and the upper template is provided with pin holes that match the pins.

[0013] Preferably, it also includes several pressing blocks, which are detachably fixed to the upper template, and the ice-making template is limited by the pressing blocks.

[0014] Preferably, both ends of the limiting hole, the upper template, and the lower template are provided with inclined guide surfaces.

[0015] Preferably, the pressing block is detachably disposed on the side of the upper template, and the ice-making template fixed on the upper template is pressed and limited by the pressing block.

[0016] Preferably, the bottom of the limiting frame is provided with several support columns.

[0017] The V-shaped fins and protrusions on the two ice-making templates to be welded are respectively embedded in the first positioning groove and the receiving groove on both sides, and are relatively fixed by the cooperation of the V-shaped fins on the ice-making templates to be welded and the first positioning groove. The second objective of this application is achieved through the following technical solution: A method for welding an evaporator of an ice maker, the method comprising a welding fixture and a regenerating furnace; the steps for welding the evaporator to be welded include: S1. Insert the V-shaped fins on the first ice-making template to be soldered into the bottom along the first positioning groove on the lower template, and apply solder paste to the ice-making template. S2. Align the two ends of the copper tube to be welded and each arc-shaped bend with the second positioning groove on the limiting mold and press it down. S3. Fit the middle template to the outside of the lower template using the limiting frame; S4. Insert the V-shaped fins on the second ice-making template to be soldered into the first positioning groove on the upper template, then press the ice-making template tightly against the upper template using the pressure block, and apply solder paste to the ice-making template. S5. After flipping the upper template, insert the pin hole downwards along the pin axis; S6. Use U-shaped clamps to clamp and fix the outer sides of the upper and lower templates respectively; S7. After the welding fixture is clamped and fixed by the U-shaped clamp, it is picked up by the handle and stacked into the preheated reflow oven. The upper and lower ends of the welding fixture are separated by the support frame and / or the handle to form a heating space so that the solder paste melts evenly.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: First, when welding the ice-making template and the evaporating copper tube, the two ends and the bent parts of the evaporating copper tube are positioned by the middle template, which can ensure the positional accuracy during welding even when the wall thickness of the evaporating copper tube is reduced, and avoid the vertical section of the evaporating copper tube from tilting. Secondly, after the V-shaped fins of the ice-making templates on both sides are stored in the first positioning groove, the first positioning groove can not only position the V-shaped fins to ensure the relative position accuracy of the ice-making template and the upper and lower templates, but also limit the opening shape of the V-shaped fins to avoid the V-shaped fins from opening too large or too small. Third, the heat conduction holes are evenly distributed along the evaporation copper tube. During the heating and welding process, the heat can be transferred to the solder joint quickly and specifically to ensure the strength of the weld and avoid the occurrence of local bulging due to excessive heating of the evaporator. Fourth, each part of the evaporator is positioned and clamped specifically by the middle template and the upper and lower modules. This not only ensures the accuracy of positioning during the welding process, but also ensures the precision of the fit. This avoids problems such as a section of the copper tube deviating from the predetermined trajectory after welding, or localized incomplete welding, missing welding, and weak welding. This effectively reduces the scrap rate of the evaporator and makes it more effective in ice making when applied to ice makers. Attached Figure Description

[0019] Figure 1 This is an exploded view of the present invention; Figure 2 This is a combined diagram of the present invention; Figure 3 This is a combined diagram of the lower template and the middle template in this invention; Figure 4 This is a diagram showing the assembly of the evaporator in the ice maker of the present invention; In the diagram: 1. Support frame; 2. Pin; 3. Support column; 4. Limiting block; 5. Lower template; 6. Middle template; 7. Second positioning groove; 8. Pressing block; 9. Upper template; 10. Heat conduction hole; 11. Handle; 12. Directional marker; 13. First through hole; 14. Pin hole; 15. Guide surface; 16. Limiting hole; 17. Limiting corner; 18. Limiting mold; 19. Limiting frame; 20. Pressing strip; 21. Second through hole; 22. Storage groove; 23. First positioning groove; 100. Ice maker evaporator body; 110. Ice making template; 111. V-shaped fins; 112. Raised strip; 120. Evaporation copper tube. Detailed Implementation

[0020] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0023] Example 1: As Figures 1-4As shown, a welding fixture for an ice maker evaporator is used to clamp and fix the evaporator body 100 of the ice maker before welding. The evaporator body 100 includes a serpentine evaporating copper tube 120 and ice-making templates 110 soldered to both sides of the evaporating copper tube 120. This causes the protrusions 112 and V-shaped fins 111 on the ice-making templates 110 to protrude outwards. To improve the ice-making effect, it is necessary to reduce the thickness of the evaporating copper tube 120 and the ice-making templates 110. However, as the thickness of the evaporating copper tube 120 and the ice-making template 110 becomes thinner, the parallelism of the evaporating copper tube 120 is easily unpredictable. After the ice-making template 110 is welded, phenomena such as incomplete welding, missing welding, and local bulging occur. It is difficult to guarantee the relative positional accuracy of the evaporating copper tube 120 and the ice-making template 110 and the firmness of all welding points by using conventional pressing methods. Therefore, the welding fixture described in this application is used to position the evaporator body 100 of the ice maker before welding. The welding fixture includes a middle template 6 for positioning the two ends and the bent portion of the evaporator copper tube 120 to be welded, and an upper template 9 and a lower template 5 on the upper and lower sides of the middle template 6 for pressing and positioning the two ice-making templates 110 to be welded. The upper template 9 and the lower template 5 are provided with a plurality of heat-conducting holes 10 evenly distributed along the welding trajectory of the evaporator copper tube 120. The inner side of the upper template 9 and the lower template 5 is also provided with a plurality of receiving grooves 22 and a first positioning groove 23 for receiving the outwardly protruding ribs 112 and V-shaped fins 111 on the ice-making templates 110 to be welded. After the middle template 6, the upper template 9 and the lower template 5 are used to position the ice maker evaporator body 100 to be welded, the ice maker evaporator body is quickly and evenly hot-melted welded through the evenly distributed heat-conducting holes 10.

[0024] Since the evaporation copper tube 120 has a serpentine structure, in order to ensure the relative parallelism and spacing between its vertical sections, the entire fixture includes a middle template 6 for positioning the two ends and the bent parts of the evaporation copper tube 120 to be welded. After positioning these areas by the middle template 6, the parallelism and spacing between each vertical section can be effectively guaranteed, thereby solving the problem of the difficulty in positioning the evaporation copper tube 120 to be welded during the welding process and avoiding the occurrence of local tilting after installation. The entire fixture also includes an upper template 9 and a lower template 5, which respectively press and position the two ice-making templates 110 on the upper and lower sides of the middle template 6. The inner sides of both the upper template 9 and the lower template 5 have several storage grooves 22 and a first positioning groove 23 for accommodating the outwardly protruding ribs 112 and V-shaped fins 111 on the ice-making templates 110 to be welded. The storage grooves 22 and the first positioning grooves 23 on the inner sides of the upper template 9 and the lower template 5 respectively press and position the outwardly protruding ribs 112 and V-shaped fins 111 on the ice-making templates 110 to be welded. After being stored, the entire inner surface of the ice-making template 110 is pressed together by the upper template 9 and the lower template 5, ensuring that the entire ice-making template 110 is in full contact with the evaporating copper tube 120. This prevents localized areas from not being properly pressed due to lack of pressure. Simultaneously, the storage groove 22 and the first positioning groove 23 also provide overall alignment for the positioning of the protrusion 112 and the V-shaped fins 111, ensuring the relative positional accuracy between the ice-making template 110 and the evaporating copper tube 120 and preventing the evaporating copper tube 120 from being misaligned. When passing through the ice-making zone between the two V-shaped fins 111, uneven ice making occurs due to left-right deviation. At the same time, multiple rows of heat-conducting holes 10 are formed on the upper template 9 and lower template 5 by opening holes, which are evenly distributed and arranged along the welding trajectory of the evaporation copper tube 120. After the evaporator body 100 of the ice maker is positioned by the welding fixture, it can be clamped and fixed externally and then placed into the heating equipment for welding. During the welding process in the heating furnace, heat can be quickly and specifically heated on both sides of the ice-making template 110 of the solder paste through the heat-conducting holes 10, thereby completing the welding. During the entire welding process, due to the targeted and comprehensive fixing and limiting by the welding fixture, the misalignment of the welded parts is effectively avoided. It also avoids problems such as cold solder joints, missing solder joints, and weak welds caused by uneven pressure around the welding point, which effectively reduces the scrap rate of the evaporator and avoids local bulging at the welding point due to excessive heating of the evaporator. As a result, the ice-making effect is better when it is applied to the ice maker.

[0025] A further improvement is that each of the first positioning grooves 23 is arranged in parallel and at equal intervals, the distance between two adjacent first positioning grooves 23 is less than or equal to the interval between two adjacent V-shaped fins 111, the width of the first positioning groove 23 is consistent with the maximum width of the welded V-shaped fins 111, and the V-angle of the V-shaped fins 111 is positioned and corrected by the first positioning groove 23.

[0026] Because the V-shaped fins 111 on the ice-making template 110 need to be evenly spaced, the first positioning grooves 23 are parallel and equidistant. Simultaneously, to ensure consistent unfolding angles of the fins after positioning, the width of the first positioning groove 23 is the same as the width of the V-shaped fins 111. Since the V-shaped area has some repositioning and unfolding issues after stamping, the V-shaped angle is slightly larger than the final angle. When positioning using the first positioning groove 23, simply pressing the ice-making template 110 downwards allows the V-shaped fins to be positioned using the first positioning groove 23. The angle is corrected to ensure both the angle of the V-shaped fins 111 and the spacing between them. To ensure the rapid installation and positioning of each V-shaped fin 111, the distance between two adjacent first positioning grooves 23 is slightly less than or equal to the spacing between two adjacent V-shaped fins 111, generally about 1mm smaller than the spacing between two adjacent V-shaped fins 111. By positioning the two outermost V-shaped fins 111, the overall positional accuracy can be guaranteed, and the problem of local non-embedding due to construction errors can be avoided.

[0027] A further improvement is made in that the bottom of the first positioning groove 23 is provided with a plurality of elongated first through holes 13; the bottom of the heat-conducting hole 10 is provided with a pressure strip 20 whose bottom contacts the ice-making template 110, and the bottom of the heat-conducting hole 10 forms two symmetrical second through holes 21 through the pressure strip 20.

[0028] The upper, middle, and lower templates 5 are all made of stainless steel or other metal materials, which extends their service life and prevents melting due to excessively high welding temperatures. Their own weight also ensures complete clamping, preventing localized areas from not being properly clamped. Furthermore, due to the overall weight of the welding fixture, the addition of the elongated first through-hole 13 not only reduces the overall weight but also allows heat to quickly reach the outer side of the V-shaped fins 111. This ensures that the area of ​​the V-shaped fins 111 near the weld point is heated simultaneously, preventing blistering caused by uneven heating after welding due to insufficient temperature of the V-shaped fins 111, and also preventing decreased strength due to temperature differences during cooling. To ensure welding quality, the area of ​​the heat-conducting hole 10 is generally similar to the area of ​​the solder coating and the size of the ice cube in an ice maker. However, because the heated area of ​​such a heat-conducting hole 10 almost covers the entire solder joint, and the area heats up quickly and at high temperatures, local bulging occurs during welding, and cold solder joints frequently appear after welding. To solve this problem, a pressure strip 20 is added to the bottom of the heat-conducting hole 10, with its bottom surface in contact with the ice-making template 110. During welding, the bottom of the heat-conducting hole 10 forms two symmetrical elongated second through holes 21 through the pressure strip 20. The cooperation of the first through hole 13 and the second through hole 21 forms a uniform cycle of holes, pressure strip 20, holes, pressure strip 20, and holes, thereby dividing the heating area at the solder joint into two and simultaneously heating both sides of the solder joint, making the heating of the area uniform and avoiding cold solder joints after welding.

[0029] A further improvement is that the upper template 9 is provided with two handles 11 on its outer side, and the bottom of the lower template 5 is provided with a support frame 1.

[0030] The upper template 9 and lower template 5 are generally made of stainless steel or other metal plates, resulting in a large overall weight, especially making them difficult to remove after welding. Therefore, two handles 11 are added to the outside of the upper template 9, and two support frames 1 are added to the bottom of the lower template 5 for easy removal. The handles 11 and support frames 1 are both made of two long strips of square steel welded together with short support rods. The square steel not only allows the upper template 9 and lower template 5 to be stably suspended on the operating table when installing the ice-making template 110, but also allows them to be stacked during welding, enabling multiple fixtures to be stacked and placed into the heating furnace simultaneously without tipping over. This also makes it easier for operators to remove them.

[0031] Further improvements include, for example Figure 3As shown, the middle template 6 includes a limiting frame 19, a limiting hole 16 located within the limiting frame 19, and a limiting mold 18 provided on the upper surfaces of both sides of the limiting frame 19. The corner of the limiting hole 16 is provided with an outwardly protruding limiting corner 17. The lower template 5 in the welding state is embedded in the limiting hole 16 and positioned by the limiting corner 17. The limiting mold 18 is provided with a second positioning groove 7. The two ends of the copper tube 120 to be welded and the arc-shaped bend are positioned by the second positioning groove 7.

[0032] The middle template 6 mainly consists of a limiting frame 19 and limiting molds 18 located on the upper sides of both ends of the limiting frame 19. The middle of the limiting frame 19 forms a limiting hole 16 for embedding the lower template 5. The limiting mold 18 has a recessed second positioning groove 7. The four corners of the limiting hole 16 are provided with outwardly protruding limiting corners 17. When positioning the evaporating copper tube 120 through the middle template 6, it is only necessary to embed both ends and the bent part of the evaporating copper tube 120 into the second positioning groove 7 to achieve fixation and positioning, avoiding the tilting of the vertical section between the two bent parts. Its bottom can also be positioned by the limiting frame 19, thereby achieving front-back, left-right and downward positioning. When assembling the middle template 6 with the lower template 5, the middle template 6 is aligned with the lower template 5 through the limiting holes 16, so that the four corners of the lower template 5 are aligned and placed downwards along the four limiting corners 17, thereby allowing the limiting frame 19 to fit over the lower template 5. The limiting frame 19 not only presses the ice-making template 110 on both sides of the lower template 5, but also precisely controls the distance between the upper end face of the ice-making template 110 and the lower end face of the evaporation copper tube 120, ensuring that the solder has sufficient thickness after welding and ensuring the firmness of the weld. In order to ensure the fitting accuracy between the middle template 6 and the lower template 5, the lower template 5 is made by cutting it directly from the middle template 6 to form the outline of the lower template 5. The limiting corners 17 are the four apex corners of the lower template 5. The side edges between two adjacent apex corners are enlarged by removing material to form the limiting holes 16. The lower template 5 made by this method improves the utilization rate of raw materials and ensures the precision of the embedding between the two.

[0033] A further improvement is made in that the bottom of the lower template 5 is provided with several outwardly protruding limiting blocks 4, and the lower template 5 embedded in the limiting hole 16 is stopped by the limiting blocks 4.

[0034] Since the lower template 5 is embedded in the middle template 6, in order to ensure the embedding depth, four outwardly protruding limiting blocks 4 are installed at the bottom of the lower template 5. The limiting blocks 4 can not only ensure that the middle template 6 can play a supporting role after being placed on the lower template 5, but also play a limiting role, so that the embedding depth of the lower template 5 can be precisely controlled.

[0035] A further improvement is made in that the lower template 5 is provided with several upwardly protruding pins 2, and the upper template 9 is provided with pin holes 14 that match the pins 2.

[0036] When installing the upper template 9, in order to ensure the positioning accuracy between the upper template 9 and the lower template 5, several upwardly protruding pins 2 are installed on the lower template 5. At the same time, multiple pin holes 14 matching the pins 2 are formed on the upper template 9. When the upper template 9 is upside down for installation, simply align the pin holes 14 with the pins 2 and insert them to ensure the positional accuracy of both.

[0037] A further improvement includes several pressing blocks 8, which are detachably fixed to the upper template 9, and the ice-making template 110 is limited by the pressing blocks 8.

[0038] Because the upper template 9 needs to be flipped over for installation when combined with the lower template 5, the ice-making template 110 may fall off due to its downward orientation after installation. Therefore, at least four L-shaped pressure blocks 8 are installed on the side of the upper template 9. After the ice-making template 110 is installed on the upper template 9, the pressure blocks 8 are fixed to the side of the upper template 9 with screws or other structures, thus limiting the upper end face of the ice-making template 110. This prevents the ice-making template 110 from falling off the upper template 9 after it is flipped over. At the same time, by setting the thickness of the pressure blocks 8, the gap between the upper template 9 and the middle template 6 can also be controlled, ensuring a precise gap after assembly. In addition to controlling the gap through the pressure blocks 8, the gap can also be limited by adding metal blocks to the limiting frame 19.

[0039] Meanwhile, the limiting hole 16, the upper template 9 and the lower template 5 are all provided with inclined guide surfaces 15 at both ends. By increasing the guide surfaces 15, the two sides of the ice-making template 110 can play a guiding role during installation, and there will be no problem of assembly failure due to resistance during the assembly process.

[0040] A further improvement is that the bottom of the limiting frame 19 is provided with several support columns 3; each template is also marked with a direction mark 12.

[0041] The support column 3 makes it easier to pick up the middle template 6 when it is placed on the platform. And the directional markers 12 on each template ensure that the lower template 5, middle template 6 and upper template 9 are assembled in the same direction without being in the opposite direction.

[0042] Example 2: A welding method for an ice maker evaporator, the method comprising a welding fixture and a heating furnace, and the steps of assembling and welding the ice maker evaporator body 100 to be welded using the ice maker evaporator welding fixture including: Step 1: Place the lower template 5 on the operating table, and then insert the V-shaped fins 111 on the first ice-making template 110 to be soldered into the first positioning groove 23 on the lower template 5, so that each V-shaped fin 111 on the ice-making template 110 is embedded in the first positioning groove 23. At the same time, ensure that the V-shaped fins 111 at both ends are located on the outer sides of both ends of the lower template 5, and apply solder paste to the area to be soldered on the ice-making template 110. The second step is to place the middle template 6 onto the lower template 5 with the ice-making template 110, and then align the two ends of the copper tube 120 to be welded and each arc-shaped bend with the second positioning groove 7 on the limiting mold 18 and press it down. The third step is to insert the V-shaped fins 111 on the second ice-making template 110 to be soldered into the first positioning groove 23 on the upper template 9, and then press the ice-making template 110 tightly against the upper template 9 by the pressure block 8, and apply soldering paste to the ice-making template 110. Fourth step: After flipping the upper template 9, align the pin hole 14 with the pin shaft 2 and insert it downwards, so that the upper, middle and lower templates 5 are stacked. Step 5: Use U-shaped clamps to clamp and fix the outer sides of the upper template 9 and the lower template 5 to ensure that they do not separate during movement. The protrusion height of the U-shaped clamps is less than the height of the handle 11 and the support frame 1, so that the entire fixture can be stacked on top of each other during welding without being affected. Step 6: After the welding fixture is clamped and fixed by the U-shaped clamp, it is taken out by the handle 11 and stacked into the preheated reflow oven. When multiple ice maker evaporator bodies 100 need to be welded simultaneously, the upper and lower ends of the welding fixture can be spaced apart by the support frame 1 and / or the handle 11 to form a heating space so that the solder paste melts evenly. After heating is completed, it is taken out for further processing. This method of heating allows the use of a larger reflow oven, and when stacking and heating in the reflow oven, no other layers are needed for support. The welding uniformity of each ice maker evaporator body 100 is higher, and the increase in external ambient temperature is smaller during the welding process.

[0043] The reflow oven can adopt a chain structure, which enables the ice maker evaporator body 100 to be stacked quickly in 1 to 3 layers during welding, and then automatically moved and heated for welding. After the heating and welding are completed, it can flow out directly, resulting in higher welding efficiency. Generally, only 1 to 2 layers are stacked, which can ensure installation efficiency, avoid the problem of not being able to take it out in time after welding, and also avoid the problem of low welding efficiency when only one layer is heated.

[0044] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A welding fixture for an ice maker evaporator, characterized in that: The system includes a middle template (6) for positioning the two ends and the bend of the copper evaporator tube (120) to be welded, and an upper template (9) and a lower template (5) on the upper and lower sides of the middle template (6) for pressing and positioning the two ice-making templates (110) to be welded. The upper template (9) and the lower template (5) are provided with a number of heat-conducting holes (10) evenly distributed along the welding trajectory of the copper evaporator tube (120). The inner side of the upper template (9) and the lower template (5) is also provided with a number of receiving grooves (22) and a first positioning groove (23) for receiving the protruding ribs (112) and V-shaped fins (111) on the ice-making template (110) to be welded. After the middle template (6), the upper template (9) and the lower template (5) are used to position the ice maker evaporator body (100) to be welded, the ice maker evaporator body is quickly and evenly hot-melted welded through the evenly distributed heat-conducting holes (10).

2. The welding fixture for an ice maker evaporator according to claim 1, characterized in that: Each of the first positioning grooves (23) is arranged in parallel and at equal intervals. The distance between two adjacent first positioning grooves (23) is less than or equal to the interval between two adjacent V-shaped fins (111). The width of the first positioning groove (23) is consistent with the maximum width of the welded V-shaped fin (111). The V-angle of the V-shaped fin (111) is positioned and corrected by the first positioning groove (23).

3. The welding fixture for an ice maker evaporator according to claim 1, characterized in that: The bottom of the first positioning groove (23) is provided with several elongated first through holes (13).

4. The welding fixture for an ice maker evaporator according to claim 1, characterized in that: The bottom of the heat-conducting hole (10) is provided with a pressure strip (20) whose bottom contacts the ice-making template (110), and the bottom of the heat-conducting hole (10) forms two symmetrical second through holes (21) through the pressure strip (20).

5. The welding fixture for an ice maker evaporator according to claim 1, characterized in that: The upper template (9) has two handles (11) on its outer side, and the lower template (5) has a support frame (1) at its bottom.

6. The welding fixture for an ice maker evaporator according to claim 1, characterized in that: The middle template (6) includes a limiting frame (19), a limiting hole (16) located in the limiting frame (19), and a limiting mold (18) provided on the upper surfaces of both sides of the limiting frame (19). The corner of the limiting hole (16) is provided with an outwardly protruding limiting corner (17). The lower template (5) in the welding state is embedded in the limiting hole (16) and positioned by the limiting corner (17). The limiting mold (18) is provided with a second positioning groove (7). The two ends of the copper tube (120) to be welded and the arc-shaped bend are positioned by the second positioning groove (7).

7. The welding fixture for an ice maker evaporator according to claim 6, characterized in that: The bottom of the lower template (5) is provided with several outwardly protruding limiting blocks (4), and the lower template (5) embedded in the limiting hole (16) is stopped by the limiting blocks (4).

8. A welding fixture for an ice maker evaporator according to claim 1, characterized in that: It also includes several pressing blocks (8), which are detachably fixed on the upper template (9), and the ice-making template (110) is limited by the pressing blocks (8).

9. A welding fixture for an ice maker evaporator according to claim 8, characterized in that: The pressure block (8) is detachably disposed on the side of the upper template (9), and the ice-making template (110) fixed on the upper template (9) is pressed and limited by the pressure block (8).

10. A welding method for an ice maker evaporator, characterized in that: The method includes the welding fixture and reflow oven as described in claims 1-9; the steps of welding the evaporator to be welded include: S1. Place the first ice-making template (110) to be soldered onto the lower template (5), so that the V-shaped fins (111) on the ice-making template (110) are embedded into the first positioning groove (23) and pressed tightly, and apply solder paste to the ice-making template (110). S2. The middle template (6) is fitted over the lower template (5) by the limiting frame (19) and stopped by the limiting block (4); S3. Align the two ends and each arc-shaped bend of the copper tube (120) to be welded with the second positioning groove (7) and press it down. S4. Place the second ice-making template (110) to be soldered onto the lower template (5), so that the V-shaped fins (111) on the ice-making template (110) are embedded into the first positioning groove (23) and pressed tightly, and apply solder paste to the ice-making template (110). S5. After clamping the side of the ice-making template (110) by installing the pressure block (8), flip the upper template (9) so that the pin hole (14) is aligned with the pin shaft (2) and inserted downwards. The distance between the installed upper template (9) and the middle template (6) is controlled by the pressure block (8). S6. Use U-shaped clamps to clamp and fix the outer sides of the upper template (9) and the lower template (5) respectively; S7. The welding fixture, which is clamped and fixed by the U-shaped clamp, is taken out by the handle 11 and stacked into the preheated reflow oven. The upper and lower ends of the welding fixture are spaced apart by the support frame 1 and / or the handle 11 to form a heating space so that the solder paste melts evenly.

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