Segmented pressure maintaining mechanism of industrial control shell injection molding mold

Abstract

The utility model belongs to mould technical field especially relates to a sectional pressure maintaining mechanism of industrial control shell injection moulding forming die. The utility model, including industrial control shell forming lower mould and industrial control shell forming upper mould, be equipped with injection part above industrial control shell forming upper mould, be equipped with center forming insert in industrial control shell forming lower mould, center forming insert front and back two ends are equipped with the end portion auxiliary forming spare that can be along close to or far from center forming insert one end removes. The utility model in the using process, through the independent drive control of end portion auxiliary forming spare, side portion auxiliary forming spare and top auxiliary forming cover plate structure, can set up the pressure maintaining pressure and the pressure maintaining time length respectively to the different structure area such as industrial control shell end portion, side portion, top portion, effectively avoid the local defect caused by traditional integral pressure maintaining, improve product forming quality.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a segmented pressure holding mechanism for injection molding of industrial control housing. Background Technology

[0002] In the field of industrial control equipment manufacturing, industrial control housings, as core protective components, have extremely high requirements for structural strength, dimensional accuracy, and surface integrity. Currently, industrial control housings are mostly manufactured using injection molding. However, traditional injection molds have significant defects in the molding process: because industrial control housings typically contain complex structures such as mesh through-holes, recessed areas, and multiple sets of holes, traditional molds use an integral pressure-holding design, which cannot adjust the pressure and timing of pressure holding according to the molding requirements of different parts of the housing. For the mesh through-hole area at the end of the housing, due to the dense structure and uneven wall thickness, integral pressure holding can easily lead to shrinkage, bubbles, or hole deformation in this area; during molding of the T-shaped mating structure on the side, if the pressure holding is insufficient, problems such as overflow at the parting surface or poor structural fit can easily occur; the top hole molding area, due to concentrated stress, is prone to hole displacement or rough hole walls during integral pressure holding. In addition, traditional demolding components often use a single straight ejector pin design, which can easily cause scratch damage to fragile structures such as mesh through-holes during demolding, further reducing the product yield. To solve the above problems, there is an urgent need for a segmented pressure holding mechanism for industrial control housing injection molding molds that can achieve precise segmented pressure holding for different molding areas of the industrial control housing, while also ensuring efficient and non-destructive demolding.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a U-shaped submarine gate structure for industrial control box housing molds [Application No.: 202420131468.3], including a lower injection mold and an upper injection mold for the industrial control box housing. In this invention, during injection molding, the lower and upper injection molds are brought close together, allowing the lower and upper inserts of the industrial control box housing to abut against each other. Simultaneously, a combined auxiliary molding component and a head auxiliary molding part are used to synchronously shape the side molding space of the normal cavity. Molten material is injected through two injection slots into the cavity, and then enters the side space of the cavity through the U-shaped submarine gate space and the straight gate space. However, this solution still has the drawback of not being able to achieve precise segmented pressure holding for different molding areas of the industrial control box housing during injection molding. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing a segmented pressure-holding mechanism for injection molding dies of industrial control housings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A segmented pressure-holding mechanism for an industrial control housing injection molding die includes a lower mold and an upper mold. An injection molded part is positioned above the upper mold. A central molding insert is located within the lower mold. End auxiliary molding parts, movable along one end of the central molding insert, are located at both ends of the central molding insert. Side auxiliary molding parts, movable along one end of the central molding insert, are located on the side of the central molding insert. A top auxiliary molding cover structure is located at the bottom of the upper mold. When the lower and upper molds are closed, the central molding insert, end auxiliary molding parts, side auxiliary molding parts, and top auxiliary molding cover structure are in close contact. A straight-angled ejector assembly, penetrating through the central molding insert, is located below the lower mold.

[0007] In the above-mentioned segmented pressure holding mechanism for injection molding of industrial control housing, the end auxiliary molding component includes end auxiliary molding slides disposed at the front and rear ends of the central molding insert, and the inner side of the end auxiliary molding slide has an end molding surface.

[0008] In the above-mentioned segmented pressure holding mechanism of the injection molding mold for industrial control housing, the end molding surface has mesh-like through-hole molding protrusions and recessed area molding protrusions, which are arranged alternately.

[0009] In the above-mentioned segmented pressure holding mechanism for injection molding of industrial control housing, a first oil cylinder is provided on the lower mold of the industrial control housing, and the piston rod of the first oil cylinder is connected to the end auxiliary molding slide.

[0010] In the above-mentioned segmented pressure holding mechanism for injection molding of industrial control housing, the side auxiliary molding component includes a side slide seat disposed on the side of the central molding insert, and the side slide seat is provided with a side auxiliary molding block.

[0011] In the above-mentioned segmented pressure holding mechanism of the injection molding mold for industrial control housing, the side auxiliary molding block has a T-shaped alignment block on the side away from the side slide, the central molding insert is provided with a T-shaped groove that slides and engages with the T-shaped alignment block, and the lower mold of the industrial control housing is provided with a second oil cylinder, the piston rod of the second oil cylinder being connected to the side slide.

[0012] In the above-mentioned segmented pressure holding mechanism of the injection molding mold for industrial control housing, the top auxiliary molding cover plate structure includes a top molding cover plate disposed at the bottom of the upper mold of the industrial control housing, and the bottom of the top molding cover plate is provided with four hole molding shafts.

[0013] In the above-mentioned segmented pressure holding mechanism of the injection molding mold for industrial control housing, the straight and inclined ejector combined demolding assembly includes an ejector rod connecting slide plate disposed below the lower mold of the industrial control housing. The ejector rod connecting slide plate is provided with several straight ejector rods and two inclined ejector rods.

[0014] In the aforementioned segmented pressure holding mechanism of the injection molding mold for industrial control housing, the outer side of the inclined push rod has an arc-shaped surface, and the arc-shaped surface of the inclined push rod is directly opposite the mesh through hole forming protrusion.

[0015] In the above-mentioned segmented pressure holding mechanism for injection molding of industrial control housing, the injection molded part includes an injection main board and an injection main hole disposed above the upper mold of the industrial control housing.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. During use, this utility model allows for independent drive control of the end auxiliary molding component, side auxiliary molding component, and top auxiliary molding cover plate structure. This enables setting the holding pressure and holding time for different structural areas such as the end, side, and top of the industrial control housing, effectively avoiding local defects caused by traditional overall pressure holding and improving product molding quality.

[0018] 2. The end auxiliary molding part of this utility model features an alternating design of mesh through-hole molding protrusions and recessed area molding protrusions, a T-shaped alignment block and a T-shaped sliding groove sliding fit of the side auxiliary molding part, and hole molding shaft positioning of the top auxiliary molding cover plate structure. These features ensure precise docking of each molding component and guarantee the molding accuracy of the complex structure of the shell.

[0019] 3. The present invention adopts a design that combines straight push rods and angled push rods. The arc-shaped surface of the angled push rod is positioned opposite the protrusion forming the mesh through hole. This design can protect the fragile mesh through hole structure during demolding, prevent scratch damage, and improve the demolding success rate.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a cross-sectional view of the present invention.

[0023] Figure 3 This is a partial structural schematic diagram of the present invention.

[0024] Figure 4 This is a partial structural schematic diagram of another aspect of this utility model.

[0025] Figure 5 This is a partial structural schematic diagram of another aspect of this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the central molded insert.

[0027] In the diagram: 1. Lower mold for industrial control housing; 2. Upper mold for industrial control housing; 3. Injection part; 4. Center molding insert; 5. End auxiliary molding part; 6. Side auxiliary molding part; 7. Top auxiliary molding cover plate structure; 8. Straight and inclined ejector assembly for demolding; 9. End auxiliary molding slide; 10. End molding surface; 11. Mesh through hole molding protrusion; 12. Recessed area molding protrusion; 13. First hydraulic cylinder; 14. Side slide; 15. Side auxiliary molding block; 16. T-shaped alignment block; 17. T-shaped slide groove; 18. Second hydraulic cylinder; 19. Top molding cover plate; 20. Hole molding shaft; 21. Ejector rod connecting slide plate; 22. Straight ejector rod; 23. Inclined ejector rod; 24. Injection main plate; 25. Injection main hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1-6 As shown, a segmented pressure-holding mechanism for an industrial control housing injection molding die includes a lower mold 1 and an upper mold 2. An injection molded part 3 is provided above the upper mold 2. A central molding insert 4 is provided inside the lower mold 1. The front and rear ends of the central molding insert 4 are provided with end auxiliary molding parts 5 that can move along one end close to or away from the central molding insert 4. The side of the central molding insert 4 is provided with side auxiliary molding parts 6 that can move along one end close to or away from the central molding insert 4. The bottom of the upper mold 2 is provided with a top auxiliary molding cover structure 7. When the lower mold 1 and the upper mold 2 are closed, the central molding insert 4, the end auxiliary molding parts 5, the side auxiliary molding parts 6, and the top auxiliary molding cover structure 7 are in close contact. A straight and inclined ejector assembly 8 that passes through the central molding insert 4 is provided below the lower mold 1.

[0030] In this embodiment, when the lower mold 1 and the upper mold 2 of the industrial control housing are closed, the central molding insert 4, the end auxiliary molding parts 5, the side auxiliary molding parts 6, and the top auxiliary molding cover structure 7 fit together precisely to form a closed cavity that matches the shape of the industrial control housing. The injection molded part 3 is used to inject molten plastic into the cavity, and the straight and inclined ejector assembly 8 is used to remove the industrial control housing from the cavity after molding. This breaks through the traditional mold design concept of "integral cavity and overall pressure holding" and decomposes the cavity into a combined structure with the central molding insert 4 as the base and the end, side, and top auxiliary molding parts working together. This provides a structural basis for segmented pressure holding and solves the problem that traditional molds cannot accurately hold pressure for complex structural areas.

[0031] Combination Figure 1-6 As shown, the end auxiliary forming component 5 includes end auxiliary forming slides 9 disposed at the front and rear ends of the central forming insert 4. The end auxiliary forming slide 9 has an end forming surface 10 on its inner side. The end forming surface 10 has a mesh through hole forming protrusion 11 and a recessed area forming protrusion 12. The mesh through hole forming protrusion 11 and the recessed area forming protrusion 12 are arranged alternately. The lower mold 1 of the industrial control housing is provided with a first oil cylinder 13. The piston rod of the first oil cylinder 13 is connected to the end auxiliary forming slide 9.

[0032] In this embodiment, the first hydraulic cylinder 13 can drive the end auxiliary molding slide 9 to move in a direction close to or away from the central molding insert 4. When it moves to the designated position, the end molding surface 10 is in contact with the end face of the central molding insert 4. The mesh through hole molding protrusion 11 is used to mold the mesh through hole structure at the end of the industrial control housing, and the recessed area molding protrusion 12 is used to mold the recessed area at the end of the housing. The staggered protrusions and protrusions can ensure that the molten plastic is evenly filled in the cavity, avoiding local accumulation or gaps. By independently controlling the movement of the end auxiliary molding slide 9 through the first hydraulic cylinder 13, the pressure holding pressure of the end area can be adjusted separately according to the molding requirements of the mesh through hole and the recessed area at the end of the housing during the pressure holding stage (adjusted by hydraulic cylinder pressure). This solves the problem of insufficient or excessive pressure holding caused by the complex structure of the end area of ​​the traditional mold, and significantly improves the molding accuracy and integrity of the end structure.

[0033] The side auxiliary molding component 6 includes a side slide 14 disposed on the side of the central molding insert 4. The side slide 14 is provided with a side auxiliary molding block 15. The side auxiliary molding block 15 has a T-shaped alignment block 16 on the side away from the side slide 14. The central molding insert 4 is provided with a T-shaped groove 17 that slides with the T-shaped alignment block 16. The lower mold 1 of the industrial control housing is provided with a second hydraulic cylinder 18. The piston rod of the second hydraulic cylinder 18 is connected to the side slide 14.

[0034] In this embodiment, when the second hydraulic cylinder 18 drives the side slide 14 to move, the side auxiliary molding block 15 moves synchronously with the side slide 14, and the T-shaped alignment block 16 slides along the T-shaped groove 17 to ensure that the side auxiliary molding block 15 is precisely aligned with the side of the central molding insert 4, avoiding misalignment. After the side auxiliary molding block 15 and the side of the central molding insert 4 are attached, they together form the molding cavity of the side of the shell, which can be used to form the T-shaped groove or other complex side structure of the side of the shell. The sliding fit structure of the T-shaped alignment block 16 and the T-shaped groove 17 greatly improves the moving accuracy of the side auxiliary molding block 15 and avoids the misalignment of the side structure caused by inaccurate positioning of traditional side molding parts. At the same time, the second hydraulic cylinder 18 can independently control the holding pressure of the side area. For the problems of overflow and loose fit that are prone to occur on the side of the shell, high-quality molding of the side structure is achieved by precise holding pressure.

[0035] The top auxiliary forming cover structure 7 includes a top forming cover 19 disposed at the bottom of the upper mold 2 for forming the industrial control housing, and the bottom of the top forming cover 19 is provided with four hole forming shafts 20.

[0036] In this embodiment, when the upper mold 2 and the lower mold of the industrial control housing are closed, the top forming cover plate 19 is attached to the top of the central forming insert 4, the end auxiliary forming part 5, and the side auxiliary forming part 6 to form a closed cavity at the top of the housing; the four hole forming shafts 20 extend vertically downward to form the four mounting holes at the top of the industrial control housing, ensuring the verticality and positional accuracy of the holes. The top forming and hole forming are integrated into the top auxiliary forming cover plate structure 7, and the top forming cover plate 19 moves with the upper mold. During the pressure holding stage, the pressure holding strength of the top area can be individually controlled by adjusting the closing pressure of the upper mold. This solves the problem of hole displacement or rough hole wall caused by uneven force on the top holes of traditional molds, and realizes the synchronous and precise forming of the top area and the hole structure.

[0037] Combination Figure 1-6 As shown, the straight and inclined ejector combined demolding assembly 8 includes an ejector rod connecting slide plate 21 disposed below the lower mold 1 of the industrial control housing. The ejector rod connecting slide plate 21 is provided with several straight ejector rods 22 and two inclined ejector rods 23. The outer side of the inclined ejector rod 23 has an arc-shaped surface, and the arc-shaped surface of the inclined ejector rod 23 is directly opposite to the mesh through hole forming protrusion 11.

[0038] In this embodiment, during demolding, the ejector rod connecting slide plate 21 drives the straight ejector rod 22 and the inclined ejector rod 23 to move upward synchronously. The straight ejector rod 22 applies force evenly from the bottom of the shell to ensure that the shell is smoothly demolded. The arc-shaped surface of the inclined ejector rod 23 is directly opposite the mesh through-hole forming protrusion 11, which can support the mesh through-hole structure at the end of the shell during demolding, preventing the through-hole from being deformed or scratched due to force. In view of the problem that traditional straight ejector demolding is prone to damaging the mesh through-hole structure, an innovative design is made to have the inclined ejector rod 23 and the mesh through-hole forming protrusion 11 directly opposite each other. The support of the arc-shaped surface achieves demolding without damage. At the same time, combined with the even force of the straight ejector rod 22, the demolding stability and safety are taken into account, further improving the product qualification rate.

[0039] Combination Figure 1-6 As shown, the injection molded part 3 includes an injection main board 24 and an injection main hole 25 disposed above the upper mold 2 for forming the industrial control housing.

[0040] In this embodiment, the injection main board 24 is used to interface with an external injection molding machine. The injection main hole 25 serves as an injection channel for molten plastic, which can uniformly transport the molten plastic into the cavity formed by the central molding insert 4, the end auxiliary molding parts 5, the side auxiliary molding parts 6, and the top auxiliary molding cover plate structure 7, ensuring that the plastic is fully filled. The position design of the injection main hole 25 is adapted to the segmented pressure holding requirements. It can coordinate with the pressure holding action of each auxiliary molding part to adjust the plastic injection rate at different pressure holding stages, avoiding defects caused by untimely plastic replenishment during local pressure holding, and realizing coordinated control of injection and pressure holding.

[0041] The working principle of this utility model is as follows:

[0042] During mold closing, the upper mold 2 for forming the industrial control housing moves downward and aligns with the lower mold 1 for forming the industrial control housing; simultaneously, the first hydraulic cylinder 13 drives the end auxiliary forming slide 9 to move towards the center forming insert 4 until the end forming surface 10 is in contact with the end face of the center forming insert 4, and the mesh through-hole forming protrusion 11 and the recessed area forming protrusion 12 enter the designated forming position; the second hydraulic cylinder 18 drives the side slide 14 to move the side auxiliary forming block 15, and the T-shaped alignment block 16 slides along the T-shaped groove 17, so that the side auxiliary forming block 15 is in contact with the side of the center forming insert 4; Finally, the central molding insert 4, the end auxiliary molding parts 5, the side auxiliary molding parts 6, and the top molding cover plate 19 of the top auxiliary molding cover plate structure 7 together form a closed industrial control shell molding cavity. The external injection molding machine injects molten plastic into the cavity through the injection main hole 25. During the injection process, the injection main hole 25 adjusts the plastic injection rate according to the cavity filling situation to ensure that the molten plastic fully fills all areas such as the mesh through holes, recessed areas, side T-shaped structures, and top holes. After the cavity is filled, the pressure holding stage begins. End pressure holding: the first hydraulic cylinder 13 adjusts the hydraulic pressure. The end auxiliary forming slide 9 is pushed to apply a specified pressure to the center forming insert 4. This maintains the pressure in the end area to address the wall thickness difference between the end mesh through-hole and the recessed area, preventing shrinkage or air bubbles in this area. Side pressure holding: The second hydraulic cylinder 18 adjusts the hydraulic pressure, applying pressure to the side auxiliary forming block 15 via the side slide 14. This ensures a tight fit between the side T-shaped structure and the center forming insert 4, preventing overflow on the side parting surface or loose fit. Top pressure holding: By adjusting the mold closing pressure of the upper mold 2 of the industrial control housing, the top forming cover plate 19 is pushed towards... A holding pressure is applied to the top of the cavity to ensure that the plastic around the top hole forming shaft 20 is fully filled, avoiding hole displacement or rough hole walls. After the holding pressure is completed, the plastic in the cavity enters the cooling stage. After the plastic cools and solidifies to form the industrial control housing, the upper mold 2 of the industrial control housing moves upward to open the mold. Subsequently, the ejector pin connecting slide plate 21 drives the straight ejector pin 22 and the inclined ejector pin 23 to move upward. The straight ejector pin 22 applies force evenly from the bottom of the housing, and the inclined ejector pin 23 supports the mesh through hole structure at the end of the housing through the arc surface. Together, they smoothly remove the industrial control housing from the cavity to complete one injection molding.

[0043] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0044] Although this article frequently uses terms such as lower mold for industrial control housing (1), upper mold for industrial control housing (2), injection molded part (3), center molding insert (4), end auxiliary molding part (5), side auxiliary molding part (6), top auxiliary molding cover structure (7), straight and inclined ejector combined demolding assembly (8), end auxiliary molding slide (9), end molding surface (10), mesh through hole molding protrusion (11), recessed area molding protrusion (12), first hydraulic cylinder (13), side slide (14), side auxiliary molding block (15), T-shaped alignment block (16), T-shaped slide groove (17), second hydraulic cylinder (18), top molding cover plate (19), hole molding shaft (20), ejector rod connecting slide plate (21), straight ejector rod (22), inclined ejector rod (23), injection main board (24), injection main hole (25), etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A segmented pressure-holding mechanism for an injection molding die for an industrial control housing, comprising a lower mold (1) and an upper mold (2) for forming the industrial control housing, characterized in that, The upper mold (2) of the industrial control housing is provided with an injection molded part (3), the lower mold (1) of the industrial control housing is provided with a central molding insert (4), the front and rear ends of the central molding insert (4) are provided with end auxiliary molding parts (5) that can move along one end close to or away from the central molding insert (4), the side of the central molding insert (4) is provided with a side auxiliary molding part (6) that can move along one end close to or away from the central molding insert (4), the bottom of the upper mold (2) of the industrial control housing is provided with a top auxiliary molding cover plate structure (7), when the lower mold (1) of the industrial control housing and the upper mold (2) of the industrial control housing are closed, the central molding insert (4), the end auxiliary molding parts (5), the side auxiliary molding parts (6) and the top auxiliary molding cover plate structure (7) are in close contact, and the lower mold (1) of the industrial control housing is provided with a straight and inclined top combined demolding assembly (8) that passes through the central molding insert (4) below the lower mold (1).

2. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 1, characterized in that, The end auxiliary molding component (5) includes end auxiliary molding slides (9) disposed at the front and rear ends of the central molding insert (4), and the inner side of the end auxiliary molding slides (9) has an end molding surface (10).

3. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 2, characterized in that, The end forming surface (10) has a mesh through hole forming protrusion (11) and a recessed area forming protrusion (12), which are arranged alternately.

4. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 3, characterized in that, The lower mold (1) for forming the industrial control housing is provided with a first oil cylinder (13), and the piston rod of the first oil cylinder (13) is connected to the end auxiliary forming slide (9).

5. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 4, characterized in that, The side auxiliary molding component (6) includes a side slide (14) disposed on the side of the central molding insert (4), and the side slide (14) is provided with a side auxiliary molding block (15).

6. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 5, characterized in that, The side auxiliary forming block (15) has a T-shaped alignment block (16) on the side away from the side slide (14). The center forming insert (4) is provided with a T-shaped groove (17) that slides with the T-shaped alignment block (16). The industrial control housing forming lower mold (1) is provided with a second oil cylinder (18), and the piston rod of the second oil cylinder (18) is connected to the side slide (14).

7. The segmented pressure holding mechanism for injection molding of industrial control housings according to any one of claims 1-6, characterized in that, The top auxiliary forming cover structure (7) includes a top forming cover (19) set at the bottom of the upper mold (2) of the industrial control housing forming, and the bottom of the top forming cover (19) is provided with four hole forming shafts (20).

8. The segmented pressure holding mechanism for injection molding of industrial control housings according to any one of claims 3-5, characterized in that, The straight and inclined ejector assembly (8) includes an ejector rod connecting slide plate (21) located below the lower mold (1) of the industrial control housing. The ejector rod connecting slide plate (21) is provided with several straight ejector rods (22) and two inclined ejector rods (23).

9. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 8, characterized in that, The outer side of the inclined push rod (23) has an arc-shaped surface, and the arc-shaped surface of the inclined push rod (23) is directly opposite the mesh through hole forming protrusion (11).

10. The segmented pressure holding mechanism for injection molding of industrial control housings according to claim 1, characterized in that, The injection molded part (3) includes an injection main plate (24) and an injection main hole (25) disposed above the upper mold (2) for forming the industrial control housing.

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