Back injection type refrigerator foaming injection equipment

Abstract

The application relates to a back material injection type refrigerator foaming injection equipment, and relates to the technical field of refrigerator foaming. The equipment comprises a connecting track, a supporting frame, a sliding assembly, a middle lifting assembly, a conveying pipe, a nozzle piece, an edge lifting assembly, a connecting seat, a driving assembly, an output pipe, a spraying piece and a foaming module. The application can solve the problem that the existing refrigerator foaming injection is mostly carried out from the side or the top of the box body, and a single injection gun head is usually used for fixed-point or one-way injection. For a large-capacity box body, when facing a complex injection cavity, the filling path is too long, the foaming liquid flows unevenly, and the like. Especially when the horizontal area and the narrow longitudinal area are injected, the single injection direction is difficult to consider all corners, and the local area is prone to defects such as lack of foaming, hollowing and the like due to the blocked foaming liquid flow or the early solidification.

Description

Technical Field

[0001] This invention relates to the field of refrigerator foaming technology, and in particular to a back-injection type refrigerator foaming injection device. Background Technology

[0002] Refrigerators use refrigeration technology to create a low-temperature environment for refrigerating and freezing food, keeping it fresh and preventing spoilage. They are essential household appliances in modern families. In the refrigerator manufacturing process, the foaming process is a crucial step. The injection cavity formed between the refrigerator body and the mold usually needs to be filled with polyurethane foam material to provide good thermal insulation performance. In order to ensure the quality of foaming, the foaming liquid needs to be filled into all areas of the injection cavity to avoid gaps or uneven density, which would affect the overall performance and service life of the refrigerator.

[0003] Existing refrigerator foaming devices, such as Chinese Patent Publication No. CN217357770U, describe a foaming structure for a vehicle refrigerator, including a cabinet and a lid. The lid is hinged to the cabinet. Both the cabinet and the lid have foaming areas with foamed material inside. Both the cabinet and the lid have foaming ports that connect to the foaming areas. The foaming ports on the cabinet and / or the lid are located on the bottom surface of the cabinet and / or the lid and face downwards. This structure places the foaming ports on the cabinet and the lid on the bottom surface. During production, the foaming equipment can perform foaming operations on the cabinet and the lid in the same direction. Furthermore, when the cabinet is laid flat and the lid is closed, the foaming ports on the cabinet and the lid can be hidden, keeping the vehicle refrigerator's appearance simple and aesthetically pleasing, and ensuring that the foaming ports are not exposed.

[0004] Most existing refrigerator foaming injection methods involve injecting material from the side or top of the refrigerator body, typically using a single injection nozzle for point-to-point or unidirectional injection. For large-capacity refrigerators, this method often suffers from problems such as excessively long filling paths and uneven flow of foaming liquid when dealing with complex injection cavities (such as the "mountain" shaped cavity formed on the back of the refrigerator). Especially when injecting foam in horizontal areas and narrow vertical areas, a single injection direction is difficult to cover all corners, easily leading to defects such as missing bubbles and hollow areas due to obstructed flow or premature solidification of the foaming liquid. Therefore, there is still room for improvement beyond the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a back-injection type foaming injection device for refrigerators, which aims to improve the efficiency of back-injection foaming in refrigerators.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A back-injection type refrigerator foaming injection device includes: connecting rails supported by a support frame, with sliding components slidably arranged between the connecting rails; a central lifting component located in the middle of the sliding component, with a conveying pipe installed at the lower end of the central lifting component, and a nozzle component with an adjustable spray trajectory slidably fitted onto the outside of the conveying pipe; an edge lifting component located at the edge of the sliding component, with a connecting seat installed at the lower end of the edge lifting component, a driving component located on one side of the connecting seat, the inside of the connecting seat forming a sliding fit connection with the upper end of the output pipe, and a multi-hole structured spraying component slidably fitted onto the outside of the output pipe; and a foaming module mounted on the sliding component, connected to the conveying pipe and the output pipe.

[0007] As a preferred embodiment of the present invention, the sliding assembly includes a sliding frame, which is slidably disposed in a groove opened in the connecting rail. Drive units are symmetrically arranged at the left and right ends of the sliding frame, and the drive units mesh with the racks arranged in the connecting rail.

[0008] As a preferred embodiment of the present invention, the drive unit includes a rotating shaft, which is rotatably disposed between bearing seats. The bearing seats are mounted on the ends of the sliding frame. Drive gears are symmetrically mounted at the front and rear ends of the rotating shaft. The drive gears mesh with the rack. The rotating shaft is controlled to rotate by an electric drive rotating component, which is mounted on the sliding frame.

[0009] As a preferred embodiment of the present invention, a telescopic tube is connected between the liquid inlet at the upper end of the conveying pipe and the foaming module, and alignment ports are symmetrically opened at the lower end of the conveying pipe. Locking units are symmetrically arranged in the middle of the conveying pipe, and the lower end face of the conveying pipe is connected to the sealing plate by pins on the left and right.

[0010] As a preferred embodiment of the present invention, the locking unit includes a fixed seat, which is installed on the side wall of the conveying pipe. The middle part of the fixed seat is horizontally slidably disposed on the sliding column. A snap-fit ​​component is installed at the outer end of the sliding column, and the snap-fit ​​component and the fixed seat are elastically connected.

[0011] As a preferred embodiment of the present invention, the nozzle component includes a sliding tube, and the conveying tube and the sliding tube are connected by an inner and outer sliding sleeve. A limit ring is provided at the upper end of the sliding tube, and a snap-fit ​​groove is opened on the upper side wall of the sliding tube. An unlocking component is horizontally slidably arranged in the snap-fit ​​groove, and the position between the conveying tube and the sliding tube is temporarily locked by snapping the snap-fit ​​component into the snap-fit ​​groove. A horizontal spray outlet is opened on the lower side wall of the sliding tube, and the position between the horizontal spray outlet and the alignment port corresponds. An ejection tube is slidably arranged up and down inside the sliding tube.

[0012] As a preferred embodiment of the present invention, the ejector pipe includes a connecting pipe, and a sliding head is installed at the upper end of the connecting pipe. The sliding head is slidably disposed inside the sliding pipe in a sealed manner. A sleeved spring is connected between the sliding head and the sliding pipe. The upper end of the sliding head has a flared structure, and the initial height of the sliding head is higher than the height of the horizontal ejector outlet.

[0013] As a preferred embodiment of the present invention, the drive assembly includes an electric drive rotating component, which is built into the interior of the connecting seat. The output shaft of the electric drive rotating component is equipped with a cam, and the electric drive rotating component is electrically connected to the power supply unit.

[0014] As a preferred embodiment of the present invention, the power supply unit includes a power supply group, and an insulating cavity is provided on one side of the connector. The power supply group, the switch and the electric drive rotating part are electrically connected and housed in the insulating cavity.

[0015] As a preferred embodiment of the present invention, the upper end of the output tube is connected to the foaming module through a flexible tube, a drive spring is connected between the upper end of the output tube and the connecting seat, the lower end of the output tube is radially obliquely cut with a horizontal foaming port, the horizontal foaming port is symmetrically arranged front and back, a vibration ring is annularly installed on the upper end of the output tube, and the vibration ring and the cam are used in a squeezing cooperation.

[0016] As a preferred embodiment of the present invention, the ejector includes an ejector head, which is slidably disposed outside the output pipe. Foaming openings are provided at the front and rear positions and the inner side of the ejector head, and a blocking component is embedded in the foaming opening. A resistance-increasing unit is symmetrically arranged at the lower end of the ejector head, and the position between the connector and the ejector head is temporarily locked by a snap-fit ​​unit.

[0017] As a preferred embodiment of the present invention, the resistance-increasing unit includes a resistance-increasing component, and the lower end of the nozzle is symmetrically provided with built-in grooves. The resistance-increasing component is horizontally slidably arranged in the built-in grooves, and a push-out spring is connected between the resistance-increasing component and the built-in grooves.

[0018] As a preferred embodiment of the present invention, the lower end of the nozzle is provided with an output port corresponding to the position of the horizontal bubble injection port, and the upper end of the nozzle is provided with symmetrical locking grooves on the left and right.

[0019] As a preferred embodiment of the present invention, the snap-fit ​​unit includes a sliding seat, which is installed at the lower end of the connecting seat. The sliding seat is connected to a locking member via an elastic telescopic rod. The locking member is positioned relative to the snap-fit ​​groove. A trigger member is installed at the upper end of the locking member. The trigger member is positioned relative to the switch member. The trigger member and the extrusion roller form an extrusion fit. The extrusion roller is slidably disposed in the sliding seat. The extrusion roller is connected to the upper end of the pressing rod.

[0020] As a preferred embodiment of the present invention, the locking member includes a connecting plate, and a snap-fit ​​plate is symmetrically installed on the inner side of the connecting plate. The snap-fit ​​plate is provided with a pressing groove, which is gradually inclined inward from bottom to top.

[0021] In summary, this application includes the following beneficial technical effects: 1. This application achieves segmented and phased foaming operations through the coordinated operation of a central foaming structure (central lifting assembly, delivery pipe, nozzle) and an edge foaming structure (edge ​​lifting assembly, connecting seat, drive assembly, output pipe, ejector). The nozzle first injects vertical foam into the longitudinal region of the injection chamber, then a secondary descent converts it to horizontal spraying, thus foaming the horizontal region above the injection chamber from the center outwards. Simultaneously, the edge foaming structure injects foam from the outside inwards into the horizontal region, ensuring uniform filling of the horizontal region and effectively avoiding localized gaps and uneven density. Finally, a secondary descent changes the positional relationship between the output pipe and ejector, altering the foaming direction and allowing foaming of the longitudinal regions on both sides. This application, through segmented and multi-directional foaming, ensures overall filling uniformity and improves the overall efficiency of the foaming operation, solving the problem of gaps that easily occur with traditional single-directional foaming. 2. The nozzle component in this application adopts a mechanical linkage structure of delivery pipe and sliding pipe. The locking component is automatically released after being pressed, and the injection direction is changed in conjunction with the sealing plate. The spray trajectory can be automatically adjusted according to the structure of the injection cavity without manual intervention, so as to perform targeted injection of foam in the longitudinal area of ​​the middle section of the injection cavity and the horizontal area on both sides. 3. This application utilizes an edge lifting assembly to drive the output pipe and the ejector to move synchronously, achieving outward-to-inward foam injection in the horizontal region of the injection chamber. This, combined with the central lifting assembly's inward-to-both-side spraying, creates synchronous filling from both inside and out, effectively avoiding excessively long paths and premature solidification of the foaming liquid caused by unilateral filling. The drive assembly employs a mechanical linkage structure of a cam and a vibrating ring. Pressing the lever automatically triggers power supply, driving the output pipe and ejector to perform small-amplitude continuous lifting and lowering, promoting the flow and filling of the foaming liquid within the narrow longitudinal region, significantly reducing the probability of missing bubbles or air pockets in this area. The locking and resistance-increasing units at the ejector enable automatic locking and unlocking. After completing horizontal foam injection, the ejector automatically unlocks and descends, changing the injection direction from horizontal to vertical. Combined with the use of the plug and the foaming port, this achieves integrated control of horizontal and vertical foam injection, simplifying operation and greatly improving the automation level and overall foaming quality of the equipment. Attached Figure Description

[0022] Figure 1 This is a first structural schematic diagram of the present invention; Figure 2This is a schematic diagram of the second structure of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is the present invention. Figure 3 First partial schematic diagram; Figure 5 This is the present invention. Figure 3 A second partial schematic diagram; Figure 6 This is a schematic diagram of the structure between the output pipe and the ejector of the present invention; Figure 7 This is the present invention. Figure 6 A sectional view; Figure 8 This is a schematic diagram showing the positions of the output tube and the horizontal bubble inlet of the present invention; Figure 9 This is a schematic diagram of the structure between the locking member, the extrusion roller, and the pressing rod of the present invention; Figure 10 This is the present invention. Figure 4 A magnified view of the area at point X; Figure 11 This is the present invention. Figure 5 A magnified view of the area at point Y; Figure 12 This is a schematic diagram showing the position between the refrigerator and the mold.

[0023] Explanation of reference numerals in the attached drawings: 1. Connecting rail; 11. Support frame; 12. Sliding assembly; 121. Sliding frame; 122. Drive unit; 123. Rotating shaft; 124. Bearing seat; 125. Drive gear; 126. Electrically driven rotating component; 2. Central lifting assembly; 21. Conveying pipe; 22. Alignment port; 23. Locking unit; 231. Fixed seat; 232. Sliding column; 233. Snap-fit ​​component; 24. Sealing plate; 3. Nozzle assembly; 31. Sliding pipe; 32. Limiting ring; 33. Snap-fit ​​groove; 34. Unlocking component; 35. Horizontal spray outlet; 36. Spray pipe; 361. Connecting pipe; 362. Sliding head; 363. Sleeve spring; 4. Edge lifting assembly; 41. Connecting seat; 5. Drive Components; 51. Electric drive rotating component; 52. Cam; 53. Power supply unit; 531. Power supply group; 532. Switch; 6. Output pipe; 61. Drive spring; 62. Horizontal injection port; 63. Vibrating ring; 7. Ejector; 71. Ejector head; 72. Foaming port; 73. Blocking component; 74. Resistance increasing unit; 741. Resistance increasing component; 742. Ejection spring; 75. Snap-fit ​​unit; 751. Sliding seat; 752. Elastic telescopic rod; 753. Locking component; 757. Connecting plate; 758. Snap-fit ​​plate; 759. Extrusion groove; 754. Trigger; 755. Extrusion roller; 756. Pressing rod; 77. Locking groove; 76. Output port; 8. Foaming module; 9. Injection chamber; 10. Mold. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 12 This application will be described in further detail.

[0025] This application discloses a back-injection type refrigerator foaming injection device. This application performs foaming operations on the injection cavity 9 (the cavity formed between the refrigerator and the mold 10) through multi-point foaming. During the foaming process, the structure of the gun head at each position is adjusted by a secondary descent, thereby changing the foaming direction and height to address different areas in the injection cavity 9. This ensures that the foaming liquid can uniformly fill the entire injection cavity, avoiding problems such as local filling gaps and uneven density. At the same time, there is no need to adjust the preset position of the gun head according to the back contour of different refrigerators in advance, adapting to the foaming operation needs of different specifications and models of refrigerators, improving the flexibility of foaming and the quality of the foamed product.

[0026] Reference Figures 1 to 5 , Figure 12 As shown, this embodiment discloses a back-injection type refrigerator foaming injection device, including a connecting rail 1, a support frame 11, a sliding assembly 12, a central lifting assembly 2, a conveying pipe 21, a nozzle 3, an edge lifting assembly 4, a connecting seat 41, a drive assembly 5, an output pipe 6, an ejector 7, and a foaming module 8. The connecting rail 1 is supported by the support frame 11. The sliding assembly 12 is slidably arranged between the connecting rails 1. The central lifting assembly 2 is located in the middle of the sliding assembly 12, and a conveying pipe 21 is installed at the lower end of the central lifting assembly 2. The delivery pipe 21 has a nozzle 3 that can change the spray trajectory, which is slidably mounted on its exterior. The edge lifting component 4 is located at the edge of the sliding component 12. The lower end of the edge lifting component 4 is equipped with a connecting seat 41. A drive component 5 is provided on one side of the connecting seat 41. The interior of the connecting seat 41 is slidably connected to the upper end of the output pipe 6. The exterior of the output pipe 6 has a multi-hole structure spray nozzle 7 that is slidably mounted on its exterior. The foaming module 8 is mounted on the sliding component 12 and is connected to the delivery pipe 21 and the output pipe 6.

[0027] In actual operation, the refrigerator (back facing up) is hoisted to a position directly above the mold 10 using existing transportation equipment, and then lowered to a low position. At this point, an injection cavity 9 is formed between the refrigerator and the mold 10 (this cavity has a "mountain" structure and is the subsequent foaming area). Then, the sliding assembly 12 drives the central lifting assembly 2, nozzle 3, edge lifting assembly 4, ejector 7, and foaming module 8 to move synchronously to a position directly above the refrigerator. Afterward, the central lifting assembly 2 drives the delivery pipe 21 and nozzle 3 to descend, and the foaming module 8 delivers the foaming liquid to the injection cavity 9 through the nozzle 3. In the longitudinal section of the middle segment, after the appropriate amount has been delivered, the delivery pipe 21 is lowered a second time by the middle lifting assembly 2. At this time, the structural adjustment between the delivery pipe 21 and the nozzle 3 ensures that the foaming liquid is sprayed horizontally, thereby injecting foam into the horizontal area of ​​the injection chamber 9. Simultaneously, the output pipe 6 and the nozzle 7 are lowered by the edge lifting assembly 4, and the foaming module 8 delivers the foaming liquid to the horizontal area of ​​the injection chamber 9 through the nozzle 7. At this time, the foaming liquid is delivered from both sides inward and from the middle to both sides, which speeds up the overall foaming speed while ensuring foaming at each position. The foaming liquid fills evenly. After the horizontal area above the injection chamber 9 is filled with foam, the output pipe 6 and the ejector 7 are lowered a second time by the edge lifting component 4. The ejector 7 is then lowered independently after unlocking. At this time, the ejector 7 sprays outwards and inwards. Subsequently, the foaming liquid is injected into the longitudinal areas on both sides of the injection chamber 9 through the ejector 7. At the same time, the energized drive component 5 drives the output pipe 6 and the ejector 7 to rise and fall slightly, improving the uniformity of the foaming liquid filling into the longitudinal areas on both sides of the injection chamber 9 and avoiding insufficient filling in narrow areas. After all areas are filled... After foaming is completed, all components are reset, and the next stage of foaming and curing can be carried out. By injecting foam in sections and stages, and adjusting the direction and position of the foaming in different stages, the foaming liquid can be gradually filled along the contour of the injection cavity. This prevents the foaming liquid from solidifying prematurely and blocking the injection path, thereby reducing foaming defects such as local missing foam and uneven density from the source. At the same time, it is compatible with the injection cavity on the back of refrigerators with different contours and sizes. It does not require readjusting the initial preset parameters of the nozzle for different refrigerator models, which simplifies the equipment debugging process and improves the overall efficiency of the foaming operation.

[0028] Reference Figure 1 As shown, the sliding assembly 12 includes a sliding frame 121, which is slidably disposed in a groove opened in the connecting rail 1. Drive units 122 are symmetrically arranged at the left and right ends of the sliding frame 121, and the drive units 122 mesh with the racks provided in the connecting rail 1.

[0029] Reference Figure 1As shown, the drive unit 122 includes a rotating shaft 123, which is rotatably disposed between bearing seats 124. The bearing seats 124 are mounted on the ends of the sliding frame 121. Drive gears 125 are symmetrically mounted at the front and rear ends of the rotating shaft 123. The drive gears 125 mesh with the rack. The rotating shaft 123 is controlled to rotate by an electric drive rotating component 126, which is mounted on the sliding frame 121.

[0030] In the actual conveying process, the rotating shaft 123 is driven to rotate by the electric drive rotating component 126 of the prior art. The synchronously rotating drive gear 125 meshes with the rack, thereby driving the sliding frame 121 to move horizontally in the slide groove of the connecting track 1.

[0031] Reference Figure 4 As shown, the delivery pipe 21 and nozzle 3 provided in this application can be used to inject foam into the longitudinal region of the middle section and the horizontal regions on both sides of the injection chamber 9 by changing the output trajectory. The specific structure is as follows: the upper liquid inlet of the delivery pipe 21 is connected to the foaming module 8 by a telescopic pipe. The lower end of the delivery pipe 21 is symmetrically provided with alignment ports 22. The middle part of the delivery pipe 21 is symmetrically provided with locking units 23. The lower end face of the delivery pipe 21 is connected to the sealing plate 24 by pins. The opening and closing of the sealing plate 24 can control the spraying situation of the lower part of the delivery pipe 21. When it is open, it is vertical injection. When it is closed, the foaming liquid is sprayed out from the horizontal spray outlet 35.

[0032] Reference Figure 10 As shown, the locking unit 23 includes a fixed seat 231, which is installed on the side wall of the conveying pipe 21. The middle part of the fixed seat 231 is horizontally slidably disposed on the sliding column 232. A snap-fit ​​member 233 is installed on the outer end of the sliding column 232, and the snap-fit ​​member 233 and the fixed seat 231 are elastically connected. The elastic connection plays the role of elastic reset. The upper side of the inner end of the fixed seat 231 is provided with a chamfer structure, and the upper end of the snap-fit ​​member 233 is provided with a chamfer structure. The chamfer structure reduces the difficulty of squeezing.

[0033] Reference Figure 4 As shown, the nozzle component 3 includes a sliding tube 31. The conveying tube 21 and the sliding tube 31 are connected by an inner and outer sliding sleeve. A limit ring 32 is provided at the upper end of the sliding tube 31. A snap-fit ​​groove 33 is opened on the upper side wall of the sliding tube 31. An unlocking component 34 is horizontally slidably arranged in the snap-fit ​​groove 33. The position between the conveying tube 21 and the sliding tube 31 is temporarily locked by snap-fit ​​component 233 into the snap-fit ​​groove 33. A horizontal spray outlet 35 is opened on the lower side wall of the sliding tube 31. The horizontal spray outlet 35 is positioned corresponding to the alignment port 22. A spray pipe 36 is slidably arranged up and down inside the sliding tube 31.

[0034] Reference Figure 4As shown, the spray pipe 36 includes a connecting pipe 361, and a sliding head 362 is installed at the upper end of the connecting pipe 361. The sliding head 362 is slidably disposed inside the sliding pipe 31 in a sealed manner. A sleeved spring 363 is connected between the sliding head 362 and the sliding pipe 31. The upper end of the sliding head 362 has a flared structure, and the initial height of the sliding head 362 is higher than the height of the horizontal spray outlet 35. The initial height of the spray pipe 36 isolates the horizontal spray outlet 35 from the delivery pipe 21, ensuring that the foaming liquid cannot be sprayed out from the horizontal spray outlet 35 at present.

[0035] In the actual foaming process, the middle lifting assembly 2 of the existing technology drives the temporarily locked delivery pipe 21 and nozzle 3 to descend synchronously until the nozzle 3 enters the injection chamber 9 (at this time, the unlocking part 34 is not squeezed). At this time, the descent stops, and the foaming liquid is delivered to the delivery pipe 21 through the foaming module 8. Then, after passing through the sliding pipe 31, it is sprayed longitudinally from below the spray pipe 36, thereby vertically foaming the longitudinal area of ​​the middle section of the injection chamber 9. After the middle longitudinal area is foamed, the middle lifting assembly 2 drives the delivery pipe 21 and nozzle 3 to descend a second time. After the limiting ring 32 is attached to the upper surface of the back of the refrigerator, the sliding pipe 31 stops descending (but the delivery pipe 21 continues to descend). At this time, the unlocking part 34 is squeezed inward by the edge of the injection hole 13 (the injection hole 13 is opened on the back of the refrigerator). The unlocking part 34 squeezes the locking part 233 to lock it in place. When component 233 is no longer engaged in the engagement groove, the position between the delivery pipe 21 and the nozzle component 3 is unlocked. As the delivery pipe 21 continues to descend, the lower end of the delivery pipe 21 will contact the upper end of the ejection pipe 36. At this time, the sealing plate 24 is squeezed by the upper end of the sliding sleeve 362 and moves towards each other until it closes. Then, the delivery pipe 21 and the ejection pipe 36 descend synchronously until the ejection pipe 36 descends to the lowest position. At this time, the horizontal nozzle 35 is aligned with the alignment port 22, and the foaming direction changes from downward to horizontal. Then, by spraying the foaming liquid from the horizontal nozzle 35, the horizontal area of ​​the injection chamber 9 is foamed from the center to both sides. The foaming liquid can directly fill the corresponding position of the horizontal area without relying on the natural flow diffusion after longitudinal foaming. This shortens the foaming time and avoids the filling gap caused by the premature solidification of the foaming liquid during the flow process, ensuring that the foaming density of the horizontal area is uniform.

[0036] Reference Figure 5 , Figure 11 As shown, the drive assembly 5, output pipe 6, and ejector 7 provided in this application can perform targeted foam injection on both sides of the longitudinal region and both sides of the horizontal region of the injection cavity 9 by changing the output trajectory. The specific structure is as follows: the drive assembly 5 includes an electric drive rotating component 51, which is built into the inside of the connecting seat 41. The output shaft of the electric drive rotating component 51 is equipped with a cam 52, and the electric drive rotating component 51 is electrically connected to the power supply unit 53.

[0037] Reference Figure 11 As shown, the power supply unit 53 includes a power supply group 531. An insulating cavity is provided on one side of the connecting seat 41. The power supply group 531, the switch 532, and the electric drive rotating part 51, which are built into the insulating cavity, are electrically connected.

[0038] Reference Figure 5 , Figure 7 , Figure 8 As shown, the upper end of the output pipe 6 is connected to the foaming module 8 through a flexible pipe. A drive spring 61 is connected between the upper end of the output pipe 6 and the connecting seat 41. The lower end of the output pipe 6 is radially obliquely cut with a horizontal foaming port 62. The horizontal foaming port 62 is arranged symmetrically front and back. A vibration ring 63 is installed in a ring around the upper end of the output pipe 6, and the vibration ring 63 and the cam 52 are used in a squeezing cooperation.

[0039] Reference Figure 5 , Figure 6 As shown, the ejector 7 includes an ejector head 71, which is slidably disposed outside the output pipe 6. Foaming ports 72 are provided at the front and rear positions and on the inner side of the ejector head 71. A blocking component 73 is embedded in each foaming port 72. Resistance-increasing units 74 are symmetrically arranged at the lower end of the ejector head 71. The position between the connecting seat 41 and the ejector head 71 is temporarily locked by a snap-fit ​​unit 75. A horizontal foam injection port 62 forms an angle with the foaming port 72 in the radial direction. The horizontal foam injection port 62 corresponds to the horizontal area of ​​the injection chamber 9. The horizontal foam injection port 62 sprays... The direction of the spray is set to spray horizontally forward and backward at an angle, thereby expanding the foaming area. The direction of the foaming port 72 is front-back and left-right, which corresponds to the longitudinal area. Opening the foaming ports 72 at the front and back positions (removing the blockage 73 from the foaming port 72) and selectively opening the foaming ports 72 at the left and right positions, combined with subsequent small-amplitude lifting, improves the rapid filling of the longitudinal area. The lower end of the spray head 71 has an output port 76 corresponding to the position of the horizontal foaming port 62, and the upper end of the spray head 71 has symmetrical locking grooves 77 on the left and right.

[0040] Reference Figures 5 to 7As shown, the resistance-increasing unit 74 includes a resistance-increasing component 741. The lower end of the nozzle 71 has symmetrically arranged internal grooves. The resistance-increasing component 741 is horizontally slidably disposed in the internal grooves. A push-out spring 742 connects the resistance-increasing component 741 and the internal grooves. The resistance-increasing unit 74 is designed to address the issue of the nozzle 71 re-locking with the connecting seat 41 after subsequent unlocking. The specific steps are as follows: After the nozzle 7 is unlocked from the connecting seat 41, a foam injection operation is performed on the longitudinal area outside the injection chamber 9. At this point, the overall foam injection operation is completed (the nozzle 7 slides between itself and the output tube 6 to reach its maximum length). Subsequently, the edge lifting assembly 4 drives the output tube 6 and nozzle 7 to rise to their maximum length, causing the nozzle 7 to be pulled out of the injection chamber 9. Then, the next set of injection chambers 9 is processed... During foam injection, the long output tube 6 and the ejector 7 are lowered by the edge lifting assembly 4. During the descent, the resistance-increasing component 741 extends outward under the pressure of the push-out spring 742, causing the lower end of the ejector 7 to briefly stop above the injection hole 13. At this time, the output tube 6 continues to descend until the locking component 753 re-engages in the locking groove 77. At this time, the ejector 7 and the connecting seat 41 are re-locked. Subsequently, under the downward pressure, the resistance-increasing component 741 is briefly squeezed back into the internal groove. After the ejector 7 enters the injection chamber 9, the resistance-increasing component 741 springs out again, thus completing the position locking of the ejector 7 and the connecting seat 41. Subsequently, the foaming liquid is sprayed out through the output port 76 in the ejector 7, thereby injecting foam into the horizontal area in the injection chamber 9.

[0041] Reference Figure 11 As shown, the latching unit 75 includes a sliding seat 751, which is installed at the lower end of the connecting seat 41. The sliding seat 751 is connected to the locking member 753 via an elastic telescopic rod 752. The locking member 753 is positioned relative to the latching groove 77. The locking member 753 is latched into the latching groove 77 to lock the position between the ejector 7 and the connecting seat 41. A trigger member 754 is installed at the upper end of the locking member 753. The trigger member 754 is positioned relative to the switch member 532. The trigger member 754 forms a pressing fit with the extrusion roller 755. The extrusion roller 755 is slidably disposed in the sliding seat 751. The extrusion roller 755 is connected to the upper end of the pressing rod 756.

[0042] Reference Figure 9 , Figure 11 As shown, the locking member 753 includes a connecting plate 757, and a snap-fit ​​plate 758 is symmetrically installed on the inner side of the connecting plate 757. The snap-fit ​​plate 758 has a pressing groove 759, which is gradually inclined inward from bottom to top. The snap-fit ​​plate 758 has a chamfered surface on its inner side.

[0043] During the actual foaming process, the edge lifting assembly 4, using existing technology, drives the connecting seat 41, driving assembly 5, output pipe 6, and spray nozzle 7 to descend synchronously until the spray nozzle 7 penetrates into the injection cavity 9 (at this time, the snap-fit ​​unit 75 is not squeezed). The foaming liquid is then delivered to the output pipe 6 via the foaming module 8. At this point, the horizontal foaming port 62 is aligned with the output port 76, and the foaming liquid in the output pipe 6 is sprayed out from the output port 76, thus performing foaming operations from the outside to the center in the upper horizontal area of ​​the injection cavity 9. This is coordinated with the nozzle 3 spraying horizontally from the center to the outside, allowing the upper horizontal area of ​​the injection cavity 9 to be filled synchronously from the outside to the center. This avoids the problems of excessively long filling paths and premature solidification of foaming liquid caused by unilateral filling, ensuring the uniformity of filling in the entire horizontal area. After the upper horizontal area is filled with foam, the edge lifting assembly 4 continues to drive the connecting seat 41, driving assembly 5, output pipe 6, and spray nozzle 7 to descend a second time until the back surface of the refrigerator is in contact with the lower surface of the sliding seat 751. At this time, the pressing rod 756 is subjected to the refrigerator's... The back is squeezed and completely retracts into the sliding seat 751. The squeeze roller 755 squeezes the snap plate along the inclined structure of the squeeze groove 759, causing the locking member 753 to move outward. At this time, the locking member 753 completely disengages from the snap groove 77, the nozzle 71 is unlocked, and it descends under the impact of gravity and the subsequent foaming liquid, exposing the foaming port 72. At the same time, the trigger member 754 presses the switch member 532, and the power supply group 531 starts to supply power to the electric drive rotating member 51. The electric drive rotating member 51 drives the cam 52 to rotate. The cam 52 continuously squeezes the vibration ring 63. With the reset action of the drive spring 61, it drives the output pipe 6 and the nozzle 71 to make small-amplitude continuous lifting and lowering. The foaming liquid is sprayed out from the opened foaming port 72 to inject foam into the longitudinal areas on both sides of the injection cavity 9. The small-amplitude lifting and lowering of the nozzle 71 can promote the flow and filling of the foaming liquid in the narrow longitudinal area, further reducing the probability of missing foam and blistering in the narrow area, ensuring that all corners of the entire injection cavity are filled in place, and improving the overall foaming quality.

[0044] Working principle: Step 1: Using existing transportation equipment, the refrigerator is hoisted to the top of the mold 10 and then lowered to a low position. At this time, an injection cavity 9 is formed between the refrigerator and the mold 10. The sliding component 12 drives the central lifting component 2, the nozzle component 3, the edge lifting component 4, the ejector component 7, and the foaming module 8 to move synchronously to the top of the refrigerator. Step 2: The temporary locking delivery pipe 21 and nozzle 3 are driven to descend synchronously by the middle lifting component 2 until the nozzle 3 enters the injection chamber 9. At this time, the descent stops, and the foaming liquid is sprayed vertically from below the spray pipe 36 through the foaming module 8, thereby vertically injecting foam into the longitudinal area of ​​the middle section of the injection chamber 9. Step 3: After the middle longitudinal area is filled with foam, the middle lifting component 2 drives the delivery pipe 21 and the nozzle 3 to descend a second time. After the limiting ring 32 is attached to the upper surface of the back of the refrigerator, the sliding pipe 31 stops descending. At this time, the unlocking component 34 is squeezed and moves inward, unlocking the position between the delivery pipe 21 and the nozzle 3. As the delivery pipe 21 continues to descend, the lower end of the delivery pipe 21 is closed by the sealing plate 24, and the horizontal spray outlet 35 is aligned with the alignment port 22. The foaming liquid is sprayed out from the horizontal spray outlet 35 to fill the horizontal area of ​​the injection cavity 9 from the center to both sides. At the same time, the edge lifting component 4 of the prior art drives the connecting seat 41, the driving component 5, the output pipe 6, and the spraying component 7 to descend synchronously until the spraying component 7 penetrates into the injection cavity 9. The foaming module 8 sprays the foaming liquid out from the output port 76 to fill the upper horizontal area of ​​the injection cavity 9 from the outside to the center, so that the upper horizontal area of ​​the injection cavity 9 is filled synchronously from the outside to the inside. Step 4: After the horizontal area above the injection chamber 9 is filled, the edge lifting component 4 continues to drive the connecting seat 41, drive component 5, output pipe 6, and spray nozzle 7 to descend a second time until the back surface of the refrigerator is in contact with the lower surface of the sliding seat 751. At this time, the pressing rod 756 is squeezed by the back of the refrigerator and completely retracts into the sliding seat 751. At this time, the locking component 753 completely exits the locking groove 77. After the spray nozzle 71 is unlocked, it descends to expose the foaming port 72. At the same time, the trigger component 754 presses the switch component 532, and the power supply group 531 starts to supply power to the electric drive rotating component 51. The electric drive rotating component 51 drives the cam 52 to rotate. The cam 52 continuously squeezes the vibration ring 63. With the reset action of the drive spring 61, the output pipe 6 and the spray nozzle 71 are driven to make small-amplitude continuous lifting and lowering. The foaming liquid is sprayed out from the opened foaming port 72 to inject foam into the longitudinal areas on both sides of the injection chamber 9. The small-amplitude lifting and lowering of the spray nozzle 71 can promote the flow and filling of the foaming liquid in the narrow longitudinal area. Step 5: After all areas have been filled with foam, reset all components and proceed to the next stage of foaming and curing.

[0045] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A back-injection type refrigerator foaming injection device, characterized in that, include: The connecting rails are supported by a support frame underneath, and sliding components are slidably installed between the connecting rails; The middle lifting component is located in the middle of the sliding component. A conveying pipe is installed at the lower end of the middle lifting component. A nozzle component that can change the spray trajectory is slidably sleeved on the outside of the conveying pipe. An edge lifting assembly is located at the edge of the sliding assembly. A connecting seat is installed at the lower end of the edge lifting assembly. A drive assembly is installed on one side of the connecting seat. The interior of the connecting seat is slidably connected to the upper end of the output pipe. A multi-hole ejector is slidably sleeved on the exterior of the output pipe. The foaming module is mounted on the sliding assembly and is connected to the delivery pipe and the output pipe.

2. The back-injection type refrigerator foaming injection device according to claim 1, characterized in that: The sliding assembly includes a sliding frame, which is slidably disposed in a groove opened in the connecting rail. Drive units are symmetrically arranged at the left and right ends of the sliding frame, and the drive units mesh with the racks arranged in the connecting rail. The drive unit includes a rotating shaft, which is rotatably disposed between bearing seats. The bearing seats are mounted on the ends of the sliding frame. Drive gears are symmetrically mounted at the front and rear ends of the rotating shaft. The drive gears mesh with the rack. The rotating shaft is controlled to rotate by an electric drive rotating component, which is mounted on the sliding frame.

3. The back-injection type refrigerator foaming injection device according to claim 1, characterized in that: The upper end of the delivery pipe is connected to the foaming module by a telescopic tube. The lower end of the delivery pipe is symmetrically provided with alignment ports on the left and right. The middle part of the delivery pipe is symmetrically provided with locking units on the left and right. The lower end face of the delivery pipe is connected to the sealing plate on the left and right by pins. The locking unit includes a fixed seat, which is installed on the side wall of the conveying pipe. The middle part of the fixed seat is horizontally slidably disposed on the sliding column. A snap-fit ​​component is installed at the outer end of the sliding column, and the snap-fit ​​component is elastically connected to the fixed seat.

4. The back-injection type refrigerator foaming injection device according to claim 3, characterized in that: The nozzle assembly includes a sliding tube, and the delivery tube and the sliding tube are connected by an inner and outer sliding sleeve. A limit ring is provided at the upper end of the sliding tube, and a snap-fit ​​groove is opened on the upper side wall of the sliding tube. An unlocking element is horizontally slidably arranged in the snap-fit ​​groove, and the position between the delivery tube and the sliding tube is temporarily locked by snapping the snap-fit ​​element into the snap-fit ​​groove. A horizontal spray outlet is opened on the lower side wall of the sliding tube, and the position between the horizontal spray outlet and the alignment port corresponds. An ejection tube is slidably arranged up and down inside the sliding tube.

5. The back-injection type refrigerator foaming injection device according to claim 4, characterized in that: The ejector pipe includes a connecting pipe, and a sliding head is installed at the upper end of the connecting pipe. The sliding head is slidably disposed inside the sliding pipe in a sealed manner. A sleeved spring is connected between the sliding head and the sliding pipe. The upper end of the sliding head has a flared structure, and the initial height of the sliding head is higher than the height of the horizontal ejector nozzle.

6. The back-injection type refrigerator foaming injection device according to claim 1, characterized in that: The drive assembly includes an electric drive rotary component, which is built into the inside of the connector. The output shaft of the electric drive rotary component is equipped with a cam, and the electric drive rotary component is electrically connected to the power supply unit. The power supply unit includes a power supply group, and an insulating cavity is provided on one side of the connector. The power supply group, the switch and the electric drive rotating part are electrically connected and housed in the insulating cavity.

7. A back-injection type refrigerator foaming injection device according to claim 6, characterized in that: The upper end of the output tube is connected to the foaming module through a flexible tube. A drive spring is connected between the upper end of the output tube and the connecting seat. The lower end of the output tube is radially obliquely cut with a horizontal foaming port. The horizontal foaming ports are arranged symmetrically front and back. A vibration ring is installed on the outer side of the upper end of the output tube, and the vibration ring and the cam are used in a squeezing cooperation.

8. The back-injection type refrigerator foaming injection device according to claim 7, characterized in that: The ejector includes an ejector head that is slidably disposed outside the output pipe. Foaming openings are provided at the front and rear positions and on the inner side of the ejector head. A plugging component is embedded in the foaming opening. A resistance-increasing unit is symmetrically arranged at the lower end of the ejector head. The position between the connector and the ejector head is temporarily locked by a snap-fit ​​unit.

9. A back-injection type refrigerator foaming injection device according to claim 8, characterized in that: The resistance-increasing unit includes a resistance-increasing component. The lower end of the nozzle has symmetrically opened internal grooves. The resistance-increasing component is horizontally slidably arranged in the internal groove. A push-out spring connects the resistance-increasing component and the internal groove.

10. A back-injection type refrigerator foaming injection device according to claim 8, characterized in that: The lower end of the nozzle has an output port corresponding to the position of the horizontal bubble injection port, and the upper end of the nozzle has symmetrical locking grooves on the left and right. The snap-fit ​​unit includes a sliding seat, which is installed at the lower end of the connecting seat. The sliding seat is connected to the locking member through an elastic telescopic rod. The locking member is positioned opposite to the snap-fit ​​groove. A trigger member is installed at the upper end of the locking member. The trigger member is positioned opposite to the switch member. The trigger member and the extrusion roller form an extrusion fit. The extrusion roller is slidably arranged in the sliding seat. The extrusion roller is connected to the upper end of the pressing rod. The locking component includes a connecting plate, and snap-fit ​​plates are symmetrically installed on the inner side of the connecting plate. The snap-fit ​​plates are provided with extrusion grooves, which gradually slope inward from bottom to top.

Images