Ejection assembly for flanging and back-off of water tank

Abstract

The invention discloses a water tank flanging back-off ejection assembly which comprises a rear mold, a large sliding block, a power assembly of the large sliding block, a plurality of core pulling mechanisms and a plurality of insert pins, the large sliding block is installed on the rear mold in a sliding mode, and the core pulling mechanisms correspond to the insert pins in a one-to-one mode and are evenly distributed in the large sliding block; each group of core pulling mechanism comprises two side pulling rods, a guide rail block, a bottom plate and a sliding key, the bottom plate is fixedly mounted on the rear mold, a lower key groove is formed in the upper surface of the bottom plate, the guide rail block is arranged above the bottom plate, a sliding groove hole penetrating up and down is formed in the guide rail block, and the sliding key is mounted in the sliding groove hole in a sliding manner; the guide rail block is further provided with two guide rails, the rear ends of the two side drawing rods correspondingly slide on the two guide rails respectively, and the front ends of the two side drawing rods can be folded to form a boss column forming cavity. An upper key groove matched with the upper end of the sliding key is further formed in the large sliding block. The device is simple in structure, reasonable in design and capable of effectively completing synchronous forming and demolding of water tank flanging reverse buckling and boss column reverse buckling, boss column breakage is avoided, and the product quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding molds, and in particular to a sink box flanged undercut ejection assembly. Background Art

[0002] With the development of the injection molding mold industry, the use of different injection molds can achieve the molding of diversified products, such as Figure 1 The water tank structure shown in the figure has a flange 01 at the open end of the water tank, and a recessed undercut 02 is set at the flange position. After the water tank is formed, the overall recessed undercut 02 needs to be demoulded through an undercut slider; at the same time, multiple boss columns 03 are fixed in the recess at the flange position, and the core pulling action needs to be completed synchronously. Due to the setting of the boss column 03, the boss column 03 is usually too thick, which easily causes the A side of the product to shrink; and in order to avoid the shrinkage of the A side of the product, the current processing technology has reduced the glue at the root of the boss column 03, such as Figure 2 As shown, the boss column 03 root and the product B surface have undercuts 04, forming an undercut structure, which makes the slider of the overall setting unable to come out. If the undercut demoulding needs to be carried out on both sides, an additional demoulding mechanism must be added, and the existing core-pulling demoulding technology cannot achieve complete demoulding processing at this structure, which will cause the boss column to break and the product to be damaged, affecting the quality of the molded product. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide a sink box flanged undercut ejection assembly.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a sink box flanged undercut ejection assembly, including a rear mold, a large slider and its power assembly, multiple sets of core pulling mechanisms and multiple inlay pins, wherein the rear mold is provided with a product forming cavity, and the large slider is slidably installed on the rear mold and is located beside the product forming cavity; multiple sets of core pulling mechanisms correspond to multiple inlay pins one by one, and the inlay pins are located in the middle of the core pulling mechanisms and are all arranged in the large slider; each set of core pulling mechanisms corresponds to a boss column, and each set of core pulling mechanisms includes two side pull rods, a guide rail block, A base plate, a sliding key and a corresponding key slot, wherein the base plate is fixedly mounted on the rear mold, and a lower key slot is provided on its upper surface; the guide rail block is placed above the base plate, and a sliding slot hole is provided thereon which runs through the upper and lower parts thereof; the sliding key is slidably installed in the sliding slot hole; the upper front end of the guide rail block is symmetrically provided with two guide rails, and the rear ends of the two side pull-out rods are respectively slidably installed on the guide rails, and the front ends of the two side pull-out rods can be matched to form a boss column forming cavity; an upper key slot is also provided in the large slider which is adapted to the upper end of the sliding key.

[0005] Furthermore, the large slider is provided with a plurality of sliding cavities whose number is equal to the above-mentioned core-pulling mechanisms. The longitudinal cross-section of a single sliding cavity is a horizontal L-shape, and a branch block is provided at the front end thereof, which is separated by two sliding rod through holes, and two side pulling rods are respectively slidably installed in the corresponding sliding rod through holes; the branch block and the rear side wall of the sliding cavity are provided with pin mounting holes on the same axis, and the above-mentioned pins are correspondingly installed in the pin mounting holes and fixed on the large slider through the base; an embedded upper keyway is provided on the top surface of the sliding cavity.

[0006] Furthermore, in the mold closing state, the upper keyway is relatively perpendicular to the position of the guide rail block and is located in front of the lower keyway is relatively perpendicular to the position of the guide rail block.

[0007] Furthermore, the distance between the front ends of the two side draw rods is greater than the distance between the rear ends of the two side draw rods.

[0008] Furthermore, the cross-section of the upper half of the guide rail block is T-shaped, and the cross-section of the lower half is rectangular. Both sides of the T-shaped vertical section of the guide rail block and the top surface of the rectangular lower half are respectively provided with upwardly protruding guide rails, and the setting direction of the guide rails is parallel to the forming direction of the inverted bottom end of the boss column; correspondingly, a guide groove adapted to the guide rail is provided on the bottom surface of the rear end of the side pull rod.

[0009] The vertical cross section of the sliding slot in the guide rail block is T-shaped, and correspondingly, the vertical cross section of the sliding key is also T-shaped.

[0010] Furthermore, guide blocks extending outward are fixedly mounted on both sides of the lower end of the guide rail block.

[0011] Furthermore, the sliding key is provided with a long slot hole for the insertion of the needle; the height of the sliding key is greater than the upper and lower thicknesses of the guide rail block, and the top and bottom ends of the sliding key are rounded.

[0012] Furthermore, the cross section of a single side pull-out rod is in a 7-shape, and the end of its transverse rod is provided with a boss column forming half cavity and an inverted forming block at the bottom of the boss column; the transverse rod ends of the two side pull-out rods are aligned to form a boss column forming cavity.

[0013] The front end of the large sliding block is also provided with a corresponding accommodation groove, which is equal to the volume of the transverse rods in the two side draw rods.

[0014] Furthermore, the power assembly of the large slider is a hydraulic cylinder, which is fixedly mounted on the rear mold through a corresponding cylinder base; the outer bottom of the left and right side walls of the large slider are fixedly provided with outwardly protruding guide sliders, which are slidably mounted in the guide groove formed by the guide pressure plate on the rear mold.

[0015] Furthermore, the lower key groove on the upper surface of the bottom plate and the upper key groove in the large sliding block are both rounded and shallow in depth, so as to squeeze the sliding key to move up and down.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure and a reasonable design, and can effectively complete the synchronous molding and demolding of the flange undercut of the sink box and the boss column undercut in the above-mentioned background technology, effectively prevent the shrinkage of the A side of the product, avoid the demolding and stretching breakage of the boss column, ensure the integrity of the product, and improve the product molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the product structure targeted by the present invention;

[0018] Figure 2 for Figure 1 A magnified view of part A;

[0019] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 4 for Figure 3 A top view of the structure in the middle;

[0021] Figure 5 for Figure 4 Cross-sectional view in the BB direction;

[0022] Figure 6 for Figure 3 Right view of the middle structure;

[0023] Figure 7 for Figure 6 Cross-sectional view in CC direction;

[0024] Figure 8 for Figure 7 A magnified view of part D in the middle;

[0025] Fig. 9 It is a structural schematic diagram of the rear mold in the present invention;

[0026] Fig.10 It is a structural schematic diagram of the large slider in the present invention;

[0027] Fig.11 It is a bottom view of the large slider in the present invention;

[0028] Fig.12 It is a structural schematic diagram of the core pulling mechanism in the present invention;

[0029] Fig.13 It is a structural schematic diagram of the guide rail block in the present invention;

[0030] Fig.14It is a structural schematic diagram of the side draw rod in the present invention;

[0031] Fig.15 It is a structural schematic diagram of the bottom plate of the present invention;

[0032] Fig.16 It is a structural schematic diagram of the sliding key in the present invention;

[0033] In the picture: 01, flange, 02, recessed undercut, 03, boss column, 04, reduced glue undercut;

[0034] 1. rear mold, 2. hydraulic cylinder, 3. large slider, 4. guide block, 5. side pull-out rod, 6. bottom plate, 7. sliding key, 8. inlay pin, 9. inlay pin base, 11. product molding cavity, 12. guide pressure plate, 13. bottom plate mounting groove, 14. guide block mounting groove, 21. cylinder base, 22. rod end connector, 31. sliding cavity, 32. branch block, 33. sliding rod through hole, 34. upper keyway, 35. power connection groove, 36. guide slider, 37. guide groove, 41. guide rail, 42. sliding slot hole, 43. guide block, 44. inlay pin through hole, 50. transverse rod, 51. boss column molding half cavity, 52. undercut molding block, 53. guide groove, 61. lower keyway, 71. long slot hole. DETAILED DESCRIPTION

[0035] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", "inside", "outside", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various components in the present invention, and do not specifically mean that any component in the present invention must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as a limitation on the present invention. In the present invention, the side of the large slider pointing to the product molding cavity is the front, and the back side is the back.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0038] like Figures 3 to 8As shown, a sink box flanged and undercut ejection assembly includes a rear mold 1, a large slider 3 and its power assembly, multiple sets of core pulling mechanisms and multiple inlay pins 8, wherein the rear mold 1 is provided with a product molding cavity 11, and a large slider sliding cavity is provided next to the product molding cavity 11, and guide block mounting grooves 14 are respectively provided on the bottom surface of the large slider sliding cavity near the left and right side walls, and a guide pressure plate 12 is fixedly installed in each guide block mounting groove 14 by a countersunk bolt, and a guide slide groove is formed between the guide pressure plate 12 and the bottom surface of the large slider sliding cavity; at the same time, a guide block parallel to the guide pressure plate 12 is fixedly installed on the bottom surface of the large slider sliding cavity on the rear mold 1. The above-mentioned large slider 3 is slidably installed in the large slider sliding cavity, combined with Fig.10 and Fig.11 As shown, the outer bottom of the left and right side walls of the large slider 3 is symmetrically provided with guide sliders 36 protruding outward, which are integrally formed with the large slider 3. The two guide sliders 36 are respectively slidably installed in the above-mentioned guide slots; at the same time, two guide slots 37 are also provided on the bottom surface of the large slider 3, which are adapted to the above-mentioned guide blocks, and the two slide together. The power component of the large slider 3 is a hydraulic cylinder 2, which is fixedly installed to the rear end side of the rear mold 1 through the cylinder base 21, and the end of its piston rod is slidably connected to the power connection slot 35 on the rear end side of the large slider 3 through the rod end connector 22. The large slider 3 is driven to slide on the rear mold 1 by the telescopic action of the piston rod in the hydraulic cylinder 2.

[0039] The above-mentioned multiple sets of core pulling mechanisms correspond to multiple inserting needles 8 one by one, and each inserting needle 8 is located in the middle of each set of core pulling mechanisms, and is arranged in the large slider 3, and then corresponds to each other one by one. Figure 1 The boss column 03 molding position shown in FIG. Each set of core pulling mechanism corresponds to a boss column 03. Figures 12 to 16As shown, each set of core pulling mechanism includes two side pulling rods 5, a guide rail block 4, a base plate 6, a sliding key 7 and a corresponding key slot, wherein the base plate 6 is fixedly installed in the corresponding base plate mounting slot 13 on the rear mold 1 by countersunk bolts, and a lower key slot 61 is provided on its upper surface. The guide rail block 4 is placed above the base plate 6, and its side view is stepped; the cross-section of the upper half of the guide rail block 4 is T-shaped, and the cross-section of the lower half is rectangular. The guide rail block 4 is integrally formed, and a sliding slot hole 42 that runs through the entire upper and lower thickness of the guide rail block 4 is provided at the T-shaped transverse section. The upper end of the sliding slot hole 42 is wide and the lower end is narrow, and its vertical cross-section is T-shaped, forming a specific limit groove; the above-mentioned sliding key 7 is slidably installed in the sliding slot hole 42, and its shape is the same as that of the sliding slot hole 42, and the upper and lower heights of the sliding key 7 are greater than the upper and lower thicknesses of the guide rail block 4; the top surface of the rectangular part of the guide rail block 4, located on both sides of its T-shaped vertical section, is symmetrically fixed with two guide rails 41, and the layout direction of the guide rail 41 is parallel to the undercut direction of the reduced glue undercut 04 on the above-mentioned product. The above-mentioned two side pull-out rods 5 are arranged opposite to each other and horizontally slideably fit on the above-mentioned guide rail 41. The cross-section of each side pull-out rod 5 is in the shape of a "7". The end of the front end transverse rod 50 is provided with a boss column forming half cavity 51 and an inverted forming block 52 at the bottom of the boss column. The ends of the transverse rods 50 in the two opposite side pull-out rods 5 are matched to form a complete boss column forming cavity; the rear end bottom surface of each of the side pull-out rods 5 is provided with a guide groove 53 adapted to the above-mentioned guide rail 41 for sliding fit between the two.

[0040] Corresponding to the core pulling mechanism, the large slider 3 is provided with a plurality of sliding cavities 31 equal to the number of the core pulling mechanisms. Fig.10 and Fig.11 As shown, the longitudinal cross-section of a single sliding cavity 31 is in a horizontal L-shape, and a shunt block 32 integrally formed with the large slider 3 is fixedly provided at the front part of its lateral section. The shunt block 32 divides the front end part into two mutually symmetrical slide rod through holes 33, and the shunt block 32 and the rear side wall of the sliding cavity 31 in the large slider 3 are provided with pin mounting holes located on the same axis; the vertical section space of the sliding cavity 31 is adapted to the above-mentioned guide rail block 4, and its front-to-back width is greater than the front-to-back width of the guide rail block 4; at the same time, an upper key groove 34 is provided on the inner top surface of the sliding cavity 31, and in the mold closing state, the upper key groove 34 is set relative to the vertical position of the guide rail block 4, and is in front of the above-mentioned lower key groove 61 relative to the vertical position of the guide rail block 4, and the vertical spacing between the two is proportional to the undercut depth of the bottom end of the above-mentioned boss column, which is set by data conversion.

[0041] The above-mentioned guide rail block 4 is installed from bottom to top in the vertical section space of the above-mentioned sliding cavity 31, and the cross-sectional area of ​​its bottom end is larger than the left and right width of the sliding cavity 31. The bottom of the left and right side walls are protruding outward with guide blocks 43, so that the guide rail block 4 can slide back and forth in the sliding cavity 31; the above-mentioned two opposite side pull-out rods 5 are slidably inserted into the corresponding sliding rod through holes 33, and the branch block 32 is placed between the two side pull-out rods 5, and its rear end is slidably connected to the guide rail 41 of the guide rail block 4, and the front end spacing of the two side pull-out rods 5 is larger than the rear end spacing of the two side pull-out rods 5; at the same time, the forming block formed by the docking of the front end transverse rods 50 in the two side pull-out rods 5 is accommodated in the front end accommodating groove of the above-mentioned large sliding block 3 to ensure flushness. The guide rail block 4 is also provided with a transversely penetrating pin through hole 44, and correspondingly, the sliding key 7 is provided with a vertical long slot hole 71. The pin 8 passes through the pin mounting hole provided on the large sliding block 3, the pin through hole 44 on the guide rail block 4 and the long slot hole 71 on the sliding key 7 from the rear end of the large sliding block 3, and is placed on the middle axis of the two side pull-out rods 5, and its rear end is fixed to the large sliding block 3 through a pin base 9 and a countersunk bolt.

[0042] According to a further optimized technical solution, the top and bottom ends of the sliding key 7 are both rounded, and the corresponding upper key groove 34 and lower key groove 61 are also rounded and chamfered, with a shallow depth, so as to facilitate the limiting and extrusion exit actions of the sliding key 7.

[0043] The specific working principle is as follows: Figure 5 and Figure 7 As shown, when Figure 1After the product shown in is formed, the front mold is opened relative to the rear mold 1, and then the hydraulic cylinder 2 is activated to drive the large slider 3 to slide backward along the guide pressure plate 12. At this time, the sliding key 7 is also squeezed by the top surface of the large slider 3, and its bottom end is inserted downward into the lower key groove 61 of the bottom plate 6. At this time, the guide rail block 4 is in a locked state; at the same time, the above-mentioned branch block 32 is integrally formed with the large slider 3 and slides backward synchronously. The retreat of the large slider 3 leaves a demolding space between the two adjacent sets of core pulling mechanisms; and because the distance between the rear ends of the two side pull rods 5 is narrow, the retreat of the branch block 32 causes the two side pull rods 5 to gradually separate to both sides along the guide rail 41 on the guide rail block 4, so that the front end of the side pull rod 5 is separated from the glue reduction buckle 04 at the bottom end of the above-mentioned boss column. When the front end of the side draw rod 5 is completely separated from the reduced glue undercut 04 at the bottom of the boss column, the large slider 3 retreats to the upper key groove 34 set thereon, just above the sliding key 7. During the retreat of the large slider 3, the guide block 4 is always squeezed backward by the side draw rod 5, so that the bottom of the sliding key 7 also always has a force to separate backward and upward from the lower key groove 61. At this time, it is released, and the sliding key 7 slides upward into the upper key groove 34. Then the large slider 3 drives the guide block 4 to move backward, and at the same time drives the side draw rod 5 to slide backward, completing the demoulding of the sunken undercut 02 at the undercut flange of the sink box. When closing the mold, the above action can be achieved by performing the opposite action.

[0044] The above technical scheme is described using one group of core pulling mechanisms as an example. Relevant technical features that have not been mentioned or described can be realized by adopting or drawing on the existing technology. A wall space of corresponding space is left at the position where the wall space is left; and the vertical section mentioned above is a section in a direction relatively perpendicular to the front-to-back direction of the mold, and the longitudinal section mentioned is a section in a direction parallel to the front-to-back direction of the mold.

[0045] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. The sink box flanged and undercut ejector assembly is characterized by: It includes a rear mold, a large slider and its power components, multiple groups of core pulling mechanisms and multiple inlay pins, wherein the rear mold is provided with a product molding cavity, and the large slider is slidably installed on the rear mold and is located beside the product molding cavity; the multiple groups of core pulling mechanisms correspond to the multiple inlay pins one by one, and the inlay pins are located in the middle of the core pulling mechanisms and are all arranged in the large slider; each group of core pulling mechanisms corresponds to a boss column, and each includes two side pull rods, a guide rail block, a bottom plate, a sliding key and a key slot corresponding thereto, wherein the bottom plate is fixedly installed on the rear mold, and a lower key slot is provided on its upper surface, the guide rail block is placed above the bottom plate, and a sliding slot hole penetrating the upper and lower parts thereof is provided thereon, and the sliding key is slidably installed in the sliding slot hole, and the upper front end of the guide rail block is symmetrically provided with two guide rails, and the rear ends of the two side pull rods are respectively slidably installed on the guide rails, and the front ends of the two side pull rods can be matched to form a boss column molding cavity; the large slider is also provided with an upper key slot adapted to the upper end of the sliding key.

2. The sink box flanged undercut ejector assembly according to claim 1, characterized in that: The large slider is provided with a plurality of sliding cavities whose number is equal to the above-mentioned core-pulling mechanisms. The longitudinal cross-section of a single sliding cavity is a horizontal L-shape, and a branch block is provided at its front end, which is separated by two sliding rod through holes, and two side pulling rods are slidably installed in the corresponding sliding rod through holes respectively; the branch block and the rear side wall of the sliding cavity are provided with needle mounting holes on the same axis, and the above-mentioned needles are correspondingly installed in the needle mounting holes and fixed on the large slider through the base; an embedded upper keyway is provided on the top surface of the sliding cavity.

3. The sink box flanged undercut ejector assembly according to claim 2, characterized in that: In the mold closing state, the upper keyway is relatively perpendicular to the position of the guide rail block and is located in front of the lower keyway is relatively perpendicular to the position of the guide rail block.

4. The sink box flanged undercut ejector assembly according to claim 2, characterized in that: The distance between the front ends of the two side draw rods is greater than the distance between the rear ends of the two side draw rods.

5. The sink box flanged undercut ejector assembly according to claim 1, characterized in that: The cross section of the upper half of the guide rail block is T-shaped, and the cross section of the lower half is rectangular. The two sides of the T-shaped vertical section of the guide rail block and the top surface of the lower rectangular section are respectively provided with upwardly protruding guide rails, and the setting direction of the guide rails is parallel to the forming direction of the undercut at the bottom end of the boss column; correspondingly, a guide groove adapted to the guide rail is provided on the bottom surface of the rear end of the side draw rod; The vertical cross section of the sliding slot in the guide rail block is T-shaped, and correspondingly, the vertical cross section of the sliding key is also T-shaped.

6. The sink box flanged undercut ejector assembly according to claim 5, characterized in that: Guide blocks extending outwards are fixedly mounted on both sides of the lower end of the guide rail block.

7. The sink box flanged undercut ejector assembly according to claim 5, characterized in that: The sliding key is provided with a long slot hole for the insertion of the inlay pin; the height of the sliding key is greater than the upper and lower thicknesses of the guide rail block, and the top and bottom ends of the sliding key are both rounded.

8. The sink box flanged undercut ejector assembly according to claim 1, characterized in that: The cross section of a single side pull rod is in the shape of a figure 7, and the end of the transverse rod is provided with a boss column forming half cavity and an undercut forming block at the bottom of the boss column; the ends of the transverse rods of the two side pull rods are aligned to form a boss column forming cavity; The front end of the large sliding block is also provided with a corresponding accommodation groove, which is equal to the volume of the transverse rods in the two side draw rods.

9. The sink box flanged undercut ejector assembly according to claim 1, characterized in that: The power assembly of the large slider is a hydraulic cylinder, which is fixedly mounted on the rear mold through a corresponding cylinder base; the outer bottoms of the left and right side walls of the large slider are fixedly provided with guide sliders protruding outward, which are slidably mounted in the guide grooves formed by the guide pressure plates on the rear mold.

10. The sink box flanged undercut ejector assembly according to claim 7, characterized in that: The lower key groove on the upper surface of the bottom plate and the upper key groove in the large sliding block are both rounded and shallow in depth, and are used to squeeze the sliding key to move up and down.

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