Injection mold for a terminal block

Abstract

This utility model discloses an injection mold for junction boxes, including a lower injection mold and an upper injection mold. The upper injection mold is snap-fitted onto the upper end of the lower injection mold, and an injection cavity is provided at the top of the lower injection mold. Four detachable lower injection molds for junction boxes are fixedly installed inside the injection cavity, and four upper injection molds for junction boxes are fixedly installed at the bottom of the upper injection mold. This device fixes the lower injection molds for junction boxes within the injection cavity using limiting plates, limiting screw holes, limiting screw grooves, and limiting bolts. When it is necessary to replace the mold with a different specification, only the limiting bolts need to be removed to remove the old mold, and the new mold can be re-fixed with bolts without replacing the entire mold. The corresponding design of the limiting screw holes and limiting screw grooves ensures accurate mold installation and positioning.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold for a junction box. Background Technology

[0002] In the electrical equipment manufacturing industry, junction boxes, as core components for wire connection and protection, are largely produced using injection molds. However, with the increasing demands for efficiency, precision, and cost control in industrial production, traditional junction box injection molds have gradually revealed numerous technical deficiencies, making it difficult to meet the needs of modern production. Specific problems include: Existing junction box injection molds often feature an integrated molding cavity design with the mold plate. When producing junction boxes of different specifications and models, the entire mold plate or even the entire mold set must be replaced. This not only consumes a significant amount of production preparation time but also requires the storage of multiple mold sets, increasing equipment procurement and storage costs. While some detachable molds use bolts for direct fixing, they lack precise limiting structures, making them prone to misalignment during installation. This can lead to misalignment between the upper and lower molds during mold closing, affecting product molding accuracy. Therefore, improvements to existing technologies are necessary. Utility Model Content

[0003] The purpose of this invention is to provide an injection mold for junction boxes to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an injection mold for a junction box, comprising a lower injection mold and an upper injection mold, wherein the upper injection mold is fastened and installed on the upper end of the lower injection mold, and an injection cavity is provided at the top of the lower injection mold; four detachable lower junction box injection molds are fixedly installed inside the injection cavity, and four upper junction box injection molds are fixedly installed at the bottom of the upper injection mold; each lower junction box injection mold has a limiting plate installed on its left and right sides, the limiting plate has a limiting screw hole at its top, and the top of the injection cavity has a limiting screw groove corresponding to the position of the limiting screw hole, and a limiting bolt is screwed into the limiting screw hole and the limiting screw groove.

[0005] As a preferred embodiment of the injection mold for a junction box according to the present invention, the lower injection mold and the upper injection mold are connected by a sealing assembly. The sealing assembly includes a locking post installed at the four corners of the bottom end of the upper injection mold and a locking slot opened at the four corners of the top end of the lower injection mold. The locking post is engaged in the locking slot, and a sealing gasket is installed at the bottom end of the locking post. A sealing cavity is opened inside the locking slot, and the sealing gasket is fitted into the sealing cavity.

[0006] As a preferred embodiment of the present invention, an injection mold for a junction box is provided, wherein the sealing gasket has a filling cavity inside, and an arched elastic plate is provided inside the filling cavity.

[0007] As a preferred embodiment of the injection mold for a junction box according to the present invention, the outer wall of the sealing gasket is provided with a smooth surface, and the smooth surface is fitted to the inner wall of the sealing cavity.

[0008] As a preferred embodiment of the injection mold for a junction box according to the present invention, the bottom end of the limiting bolt is provided with a circular groove, and a bolt rod is vertically installed at the bottom end of the circular groove. The bolt rod is screwed into the limiting screw hole and the limiting screw groove.

[0009] As a preferred embodiment of the injection mold for a junction box according to this utility model, a fixing ring is installed on the upper outer end of the bolt rod, and an annular pressure plate, a spring and an annular rubber sheet are fitted on the circumferential surface of the bolt rod. An extrusion block is installed at the upper edge of the annular rubber sheet, and the outer wall of the limiting bolt is provided with an arc surface, and the surface of the arc surface is provided with anti-slip texture.

[0010] As a preferred embodiment of the injection mold for a junction box according to the present invention, an overflow cavity is provided at the center of the injection cavity, and an overflow port is provided on the side wall of the lower injection mold of the junction box inside the injection cavity, and the overflow port and the overflow cavity are connected.

[0011] As a preferred embodiment of the injection mold for a junction box according to this utility model, a bearing base is installed at the bottom of the lower injection mold, a bearing top seat is installed at the top of the upper injection mold, an injection port is opened at the top of the bearing top seat and the injection port is connected to the upper injection mold of the junction box, a pressure relief port is opened on the side wall of the upper injection mold, and a handle is installed on the other side wall of the upper injection mold.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the setting of the injection mold for the junction box has a reasonable structural design; This device secures the junction box injection mold within the injection cavity using a limiting plate, limiting screw holes, limiting screw grooves, and limiting bolts. When changing to a different mold size, simply remove the limiting bolts to remove the old mold, and then re-secure it with the bolts after replacing it with the new mold; there's no need to replace the entire mold plate. The corresponding design of the limiting screw holes and grooves ensures precise mold installation and positioning, preventing misalignment during mold closing and significantly shortening production preparation time. Simultaneously, the detachable structure reduces the need for stockpiling the entire mold set, lowering equipment procurement and storage costs, and improving mold adaptability and production flexibility. Attached Figure Description

[0013] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention; Figure 2 This is a top-view three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the bolt body of this utility model; Figure 4 This is a schematic diagram of the sealing gasket of this utility model.

[0014] In the diagram: 1. Support base; 2. Lower injection mold; 3. Upper injection mold; 4. Support top seat; 5. Injection port; 6. Injection cavity; 7. Lower injection mold for junction box; 8. Overflow cavity; 9. Overflow port; 10. Limiting plate; 11. Limiting bolt; 111. Circular groove; 112. Annular rubber sheet; 113. Bolt rod; 114. Extrusion block; 115. Annular pressure plate; 116. Fixing ring; 117. Spring; 118. Arc surface; 12. Upper injection mold for junction box; 13. Pressure relief port; 14. Handle; 15. Clamping post; 16. Sealing gasket; 17. Sealing cavity; 18. Clamping slot; 19. Filling cavity; 20. Arched elastic plate; 21. Smooth surface. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: In this technical solution, an injection mold for a junction box includes a lower injection mold 2 and an upper injection mold 3. The upper injection mold 3 is fastened and installed on the upper end of the lower injection mold 2. The top of the lower injection mold 2 is provided with an injection cavity 6. Four detachable lower injection molds 7 for junction boxes are fixedly installed inside the injection cavity 6. Four upper injection molds 12 for junction boxes are fixedly installed at the bottom end of the upper injection mold 3. Limiting plates 10 are installed on the left and right sides of each lower injection mold 7. Limiting screw holes are opened at the top of the limiting plates 10. Limiting screw grooves corresponding to the positions of the limiting screw holes are opened at the top of the injection cavity 6. Limiting bolts 11 are screwed into the limiting screw holes and the limiting screw grooves.

[0017] Specifically, the lower and upper injection molds are the core load-bearing structures of the mold, made of P20 pre-hardened plastic mold steel. This material has a hardness of HRC28-32, combining high strength with good machinability, and can withstand long-term injection pressure impact. The interlocking structure uses "guide pillars-guide sleeves" for auxiliary positioning to ensure precise alignment of the upper and lower molds and avoid misalignment during mold closing. The injection cavity is the core area for the injection molding of the junction box; its inner wall needs to be polished to reduce plastic flow resistance and ensure a smooth product surface. The lower injection mold for the junction box is designed according to the specifications of the junction box. Designed using 718H mold steel, this junction box is suitable for producing standard junction boxes with dimensions of 120mm×80mm×50mm. The upper and lower injection molds of the junction box form a complete cavity, with integrated gates and cooling channels to ensure uniform plastic filling and rapid cooling. The limiting plate, made of 45# steel and surface hardened (hardness HRC40-45), restricts the lateral displacement of the lower mold and enhances its wear resistance. The limiting screw holes and screw grooves are threaded to achieve longitudinal fixation of the mold, with a thread precision of 6H / 6g to ensure reliable connection. Specific data: The dimensions of the lower injection mold 2 are 800mm×600mm×120mm, and the dimensions of the upper injection mold 3 are 800mm×600mm×100mm. Both edges are rounded (R5mm) to prevent scratches to operators during assembly. Four SKD61 guide pillars, each 25mm in diameter and 100mm in length, are installed at the four corners of the top of the lower injection mold 2. Corresponding guide sleeves are installed on the upper injection mold 3. The fit accuracy between the guide pillars and guide sleeves is H7 / g6, and the surface roughness Ra≤0.8μm. The overall dimensions of the injection cavity 6 are 600mm×400mm×80mm, with a cavity wall thickness of 30mm and an inner wall surface roughness Ra≤0.4μm. A 1° draft angle is provided at the bottom of the cavity for easy production. Product removal; the dimensions of the lower injection mold 7 for each junction box are 140mm×100mm×70mm, the top of the mold is flush with the top of the injection cavity 6, the four molds are arranged in a rectangular array, and the distance between adjacent molds is 50mm; the dimensions of the upper mold 12 match those of the lower mold 7, and the bottom end has a molding structure corresponding to the top cover of the junction box, with an 8mm diameter point gate inside, a cooling water channel diameter of 10mm, and a water channel spacing of 30mm; the dimensions of the limiting plate 10 are 100mm×50mm×15mm, the flatness of the surface in contact with the mold side wall is ≤0.02mm, and the contact gap is ≤0.03mm; the specifications of the limiting screw hole and screw groove are M14×2, the screw hole depth is 30mm, the screw groove depth is 20mm, and the length of the limiting bolt 11 is 55mm; Installation method: The lower injection mold plate 2 is fixed in the T-slot of the injection molding machine's worktable by four M20 countersunk bolts, with a tightening torque of 55-60 N·m; the upper injection mold plate 3 is connected to the moving mold plate of the injection molding machine by locating pins with a diameter of 20 mm and a clearance ≤0.02 mm; the guide column is pressed into the mounting hole of the lower injection mold plate 2 by interference fit (interference 0.01-0.02 mm), and the guide sleeve is fixed in the countersunk hole of the upper injection mold plate 3 by bolts. After installation, the perpendicularity of the guide column axis to the mold plate plane must be ≤0.01 mm / m; two locating pins with a diameter of 12 mm are set at the bottom of the mold, which cooperate with the locating holes at the bottom of the injection cavity 6. The upper mold 12 is fixed to the bottom of the upper injection mold plate 3 by four M16 hexagon socket head cap bolts. The bolt tightening torque is 35-40 N·m. During installation, it needs to be calibrated with a dial indicator to ensure that the alignment error of the upper and lower molds is ≤0.01 mm. The limiting plate 10 is fixed to the inner wall of the injection cavity 6 by two M12 bolts. The positional error between the bolt mounting holes and the limiting plate is ≤0.05 mm. The limiting bolts 11 are passed through the screw holes of the limiting plate 10 and the screw grooves of the injection cavity 6 in sequence and tightened with a torque wrench. The tightening torque is 25-30 N·m. After installation, it is necessary to check whether the mold is loose.

[0018] In some technical solutions, the lower injection mold 2 and the upper injection mold 3 are connected by a sealing assembly. The sealing assembly includes a locking post 15 installed at the four corners of the bottom end of the upper injection mold 3 and a locking slot 18 opened at the four corners of the top end of the lower injection mold 2. The locking post 15 is locked in the locking slot 18. A sealing gasket 16 is installed at the bottom end of the locking post 15. A sealing cavity 17 is opened inside the locking slot 18. The sealing gasket 16 is fitted with the sealing cavity 17.

[0019] Specifically, the sealing component is used to prevent molten plastic from overflowing from the mold gap, improving the injection molding seal, and is suitable for high-pressure injection molding scenarios (injection pressure ≥150MPa); the retaining post and retainer are the positioning structures of the sealing component, made of 304 stainless steel, which is corrosion resistant and has high strength; the sealing gasket is made of heat-resistant silicone (temperature range -40℃ to 200℃), and the sealing cavity and the sealing gasket form an interference fit to enhance the sealing effect; the fit setting ensures that there is no gap between the sealing gasket and the sealing cavity, and the elastic deformation of the sealing gasket fills the tiny gaps; Specific data: The overall height of the sealing assembly is 20mm, and the distance from the edge of the template is 20mm, forming a continuous sealing ring; the retaining post 15 has a diameter of 30mm, a length of 40mm, and a hemispherical top (R15mm); the retaining groove 18 has an inner diameter of 30.5mm, a depth of 40mm, and an inner wall roughness Ra≤1.6μm; the sealing gasket 16 has a diameter of 40mm and a thickness of 10mm; the sealing cavity 17 has an inner diameter of 39mm, a depth of 10mm, and an interference fit of 1mm; the flatness of the mating surface is ≤0.05mm, and the mating area accounts for more than 95% of the total area of ​​the sealing gasket; Installation method: The locking post and the locking slot of the sealing component adopt a modular design and are fixed to the upper and lower templates respectively by bolts. After installation, an airtightness test is required to ensure no leakage. The locking post 15 is pressed into the mounting hole of the upper injection template 3 by interference fit. The locking slot 18 is formed by CNC drilling. After installation, the coaxiality of the locking post and the locking slot must be ≤0.02mm. The sealing gasket 16 is pasted to the bottom end of the locking post 15 with high-strength adhesive (bonding strength ≥5MPa). The sealing cavity 17 is formed by milling. When locking, the sealing gasket must be fully embedded in the sealing cavity. When the mold is closed, the injection molding machine applies a clamping force of 50-60kN to fully compress the sealing gasket in the sealing cavity (compression amount is 20%-30%) to achieve a tight fit.

[0020] In some technical solutions, the sealing gasket 16 has a filling cavity 19 inside, and an arched elastic plate 20 is provided inside the filling cavity 19.

[0021] Specifically, the filling cavity and the arched elastic plate are used to enhance the elastic recovery ability of the gasket and prevent the gasket from failing due to long-term compression.

[0022] Specific data: The filling cavity 19 has a diameter of 25mm and a depth of 8mm; the arched elastic plate 20 is made of 65Mn spring steel, with an arch height of 5mm, a thickness of 1mm, and an elastic deformation range of 0-3mm.

[0023] Installation method: After the arched elastic plate 20 is formed by stamping, it is embedded in the filling cavity 19 of the sealing gasket, and then the sealing gasket is pressed by the mold to make the elastic plate wrap around it, ensuring that there is no loosening.

[0024] In some technical solutions, the outer wall of the sealing gasket 16 is provided with a smooth surface 21, and the smooth surface 21 is fitted to the inner wall of the sealing cavity 17.

[0025] Specifically, the smooth surface is polished to reduce frictional resistance during snap-fitting and to reduce the risk of plastic residue adhesion.

[0026] Specific data: The surface roughness Ra of smooth surface 21 is ≤0.2μm, and the width is 5mm, surrounding the outer wall of the sealing gasket.

[0027] Installation method: The outer wall of the sealing gasket is polished with a diamond grinding wheel to form a smooth surface. During installation, a small amount of silicone-based grease (temperature resistance ≥180℃) is applied to the smooth surface to facilitate the connection between the clamp and the jaw.

[0028] In some technical solutions, the bottom end of the limiting bolt 11 is provided with a circular groove 111, and a bolt rod 113 is vertically installed at the bottom end of the circular groove 111. The bolt rod 113 is screwed into the limiting screw hole and the limiting screw groove.

[0029] The circular groove is used to accommodate the bolt head and prevent the bolt from protruding and affecting the mold assembly. The bolt shank is made of 40Cr alloy steel with a strength grade of 8.8.

[0030] Specific data: The diameter of the circular groove 111 is 20mm and the depth is 10mm; the diameter of the bolt rod 113 is 14mm and the length is 45mm, with a thread specification of M14×2.

[0031] Installation method: The bolt rod 113 and the limit bolt body are integrally forged, and the circular groove is machined on a lathe to ensure that the perpendicularity between the bolt rod and the bottom surface of the groove is ≤0.01mm. In some technical solutions, a fixing ring 116 is installed on the upper outer end of the bolt rod 113, and an annular pressure plate 115, a spring 117 and an annular rubber sheet 112 are fitted on the circumferential surface of the bolt rod 113. An extrusion block 114 is installed at the upper edge of the annular rubber sheet 112, and an arc surface 118 is provided on the outer wall of the limiting bolt 11, and the surface of the arc surface 118 is provided with anti-slip texture.

[0032] Specifically, the retaining ring, made of Q235 steel and galvanized for rust prevention, is used to limit the displacement of the spring and the annular pressure plate. The annular pressure plate is made of stainless steel, the spring is a cylindrical helical compression spring, and the annular rubber sheet is made of nitrile rubber (oil-resistant and temperature-resistant). The three components together form a buffer structure. The extrusion block 114 is annular with a triangular cross-section, an inner diameter of 15mm, an outer diameter of 32mm, and a height of 3mm. There are four of them, evenly distributed on the edge of the rubber sheet. The arc surface makes it easy for the operator to grip, and the anti-slip texture enhances friction and prevents slippage during twisting. Specific data: The inner diameter of the fixing ring 116 is 14.5mm, the outer diameter is 25mm, and the thickness is 3mm. It is clearance-fitted with the bolt rod 113; the annular pressure plate 115 has an inner diameter of 15mm, an outer diameter of 30mm, and a thickness of 2mm; the spring 117 has a diameter of 8mm, a free length of 20mm, and a stiffness of 5N / mm; the annular rubber sheet 112 has an inner diameter of 15mm, an outer diameter of 30mm, and a thickness of 5mm; the extrusion block 114 is annular with a triangular cross-section, an inner diameter of 15mm, an outer diameter of 32mm, and a height of 3mm. There are 4 of them, evenly distributed on the edge of the rubber sheet. The overflow chamber 8 has a diameter of 100mm, a depth of 50mm, and a volume of approximately 0.4L. The bottom of the chamber is set with a 5° inclination angle to facilitate the removal of overflow.

[0033] In some technical solutions, an overflow cavity 8 is provided at the center of the injection cavity 6, and an overflow port 9 is provided inside the injection cavity 6 at the side wall of the lower mold 7 for the junction box injection, and the overflow port 9 and the overflow cavity 8 are connected.

[0034] Detailed supplementary explanation: The overflow port is the flow channel for overflowing material and adopts an inverted cone design to prevent overflowing material from flowing back.

[0035] Specific data: Each mold sidewall is provided with 2 overflow ports 9, with an overflow port diameter of 10mm (inlet end) and 8mm (outlet end), and a length of 20mm. The connection position with the overflow cavity 8 is 10mm from the bottom of the cavity.

[0036] Installation method: Overflow port 9 is machined by a drilling machine, with the inlet end tangent to the side wall of the mold to ensure smooth flow of overflow material. Burrs need to be removed after machining.

[0037] In some technical solutions, a support base 1 is installed at the bottom of the injection mold 2, a support top seat 4 is installed at the top of the injection mold 3, an injection port 5 is opened at the top of the support top seat 4, and the injection port 5 is connected to the injection mold 12 of the junction box. A pressure relief port 13 is opened on the side wall of the injection mold 3, and a handle 14 is installed on the other side wall of the injection mold 3.

[0038] Specifically, the support base is used to enhance mold stability and distribute injection pressure. It is made of HT300 gray cast iron and has good shock absorption performance. The support top seat is used to connect the moving platen of the injection molding machine and transmit the clamping force. Its material is the same as that of the support base. The injection port is the entrance for molten plastic and adopts a main runner design to match the injection molding machine nozzle. The pressure relief port is used to release residual gas inside the cavity and trace amounts of volatile gas generated during the injection molding process, preventing gas stagnation that could lead to defects such as bubbles and shrinkage cavities in the junction box. It also balances the cavity pressure and protects the mold structure. The handle provides a gripping fulcrum for mold handling, installation, and maintenance. It is made of 304 stainless steel with a brushed surface, combining strength and anti-slip properties, and is corrosion resistant, making it suitable for complex workshop environments.

[0039] Specific data: The dimensions of the support base 1 are 900mm×700mm×50mm, and the weight is approximately 250kg. Four leveling bolts (M24) are installed at the bottom of the base.

[0040] Installation method: The support base 1 is connected to the injection molded lower template 2 by 8 M20 bolts. The bolt tightening torque is 60-65 N·m. After installation, the flatness of the base is ≤0.05 mm / m by adjusting the leveling bolts.

[0041] Working principle: I. Initial State and Mold Closure Preparation When the mold is in the open state, the lower injection mold plate 2 is fixed to the injection molding machine worktable by the support base 1, and the four junction box injection molds 7 are precisely fixed in the injection cavity 6 by the limit plate 10 and the limit bolt 11; the upper injection mold plate 3 is connected to the injection molding machine moving mold plate by the support top seat 4, and the junction box injection mold 12 at its bottom corresponds one-to-one with the lower mold 7. At this time, the operator needs to confirm that the overflow cavity 8 and the overflow port 9 are unobstructed, the filter screen of the pressure relief port 13 is not blocked, and the sealing gasket 16 and the sealing cavity 17 are clean and free of foreign objects.

[0042] After the mold closing procedure is initiated, the injection molding motorized template drives the upper injection mold 3 downwards. The guide post at the top of the lower mold plate precisely positions the upper mold plate against the guide sleeve of the upper mold plate, ensuring a smooth fit between the upper and lower mold plates. Simultaneously, the retaining post 15 at the bottom of the upper mold plate engages with the retaining slot 18 of the lower mold plate. Under the mold closing force, the sealing gasket 16 is compressed and tightly fitted with the sealing cavity 17, creating a sealed environment to prevent plastic overflow during subsequent injection molding.

[0043] II. Injection Filling Stage After the mold is closed, the injection molding machine injects heated and molten plastic (such as PP, ABS, etc.) into the mold under high pressure through the injection port 5 on the support top seat 4. The molten plastic is dispersed along the flow channel in the upper injection mold 12 into the closed cavity composed of four upper and lower molds. During the filling process, the air remaining in the cavity and the gas generated by the volatilization of plastic are discharged through the pressure relief port 13 on the side wall of the upper injection mold plate 3 to avoid bubbles and voids after the junction box is formed.

[0044] Once the cavity is filled, excess molten plastic flows through the overflow port 9 on the side wall of the injection mold 7 into the overflow cavity 8 in the center of the injection cavity 6, ensuring that the cavity is fully filled while avoiding excessive plastic leading to excessive mold pressure.

[0045] III. Cooling and Molding Stage After injection molding is completed, the mold enters the cooling stage. The injection molding machine circulates cooling water through pre-designed cooling channels inside the mold (integrated into the upper and lower molds), using heat exchange to remove the heat from the molten plastic. As the temperature decreases, the plastic gradually solidifies within the closed cavity, forming a junction box blank that conforms to the shape of the cavity. The cooling time is adjusted according to the thickness of the junction box (usually 15-30 seconds) to ensure the blank is completely solidified and has sufficient strength to prevent deformation during demolding.

[0046] IV. Mold Opening and Demolding / Part Removal After cooling, the moving injection mold platen drives the upper injection mold platen 3 upward to open the mold, separating the upper and lower molds. The operator uses the handle 14 on the side wall of the upper injection mold platen 3 to adjust the mold position, then loosens the limiting bolt 11 in the injection cavity 6 and removes the limiting plate 10, allowing the solidified junction box blank to be removed from the lower injection mold 7. Finally, the residual plastic in the overflow cavity 8 and debris on the mold surface are cleaned, preparing for the next injection cycle.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An injection mold for a junction box, comprising a lower injection mold (2) and an upper injection mold (3), characterized in that, The upper injection mold (3) is fastened and installed on the upper end of the lower injection mold (2), and the top of the lower injection mold (2) is provided with an injection cavity (6). The injection cavity (6) is fixedly installed with four detachable junction box injection lower molds (7), and the bottom end of the injection upper mold (3) is fixedly installed with four junction box injection upper molds (12). Each of the junction box injection molds (7) has a limit plate (10) installed on both sides. The top of the limit plate (10) has a limit screw hole, and the top of the injection cavity (6) has a limit screw groove corresponding to the position of the limit screw hole. Limit bolts (11) are screwed into the limit screw hole and the limit screw groove.

2. The injection mold for a junction box according to claim 1, characterized in that, The lower injection mold (2) and the upper injection mold (3) are connected by a sealing assembly. The sealing assembly includes a locking post (15) installed at the four corners of the bottom of the upper injection mold (3) and a locking slot (18) opened at the four corners of the top of the lower injection mold (2). The locking post (15) is locked in the locking slot (18). A sealing gasket (16) is installed at the bottom of the locking post (15). A sealing cavity (17) is opened inside the locking slot (18). The sealing gasket (16) is fitted to the sealing cavity (17).

3. The injection mold for a junction box according to claim 2, characterized in that, The sealing gasket (16) has a filling cavity (19) inside, and an arched elastic plate (20) is provided inside the filling cavity (19).

4. The injection mold for a junction box according to claim 3, characterized in that, The outer wall of the sealing gasket (16) is provided with a smooth surface (21), and the smooth surface (21) is fitted to the inner wall of the sealing cavity (17).

5. The injection mold for a junction box according to claim 1, characterized in that, The bottom end of the limiting bolt (11) is provided with a circular groove (111), and a bolt rod (113) is vertically installed at the bottom end of the circular groove (111). The bolt rod (113) is screwed into the limiting screw hole and the limiting screw groove.

6. The injection mold for a junction box according to claim 5, characterized in that, A fixing ring (116) is installed on the upper outer end of the bolt rod (113). An annular pressure plate (115), a spring (117) and an annular rubber sheet (112) are fitted on the circumferential surface of the bolt rod (113). An extrusion block (114) is installed at the upper edge of the annular rubber sheet (112). The outer wall of the limiting bolt (11) is provided with an arc surface (118), and the surface of the arc surface (118) is provided with anti-slip texture.

7. The injection mold for a junction box according to claim 1, characterized in that, An overflow cavity (8) is provided at the center of the injection cavity (6), and an overflow port (9) is provided inside the injection cavity (6) at the side wall of the junction box injection mold (7), and the overflow port (9) and the overflow cavity (8) are connected.

8. The injection mold for a junction box according to claim 1, characterized in that, The bottom end of the injection molding lower template (2) is equipped with a bearing base (1), the top end of the injection molding upper template (3) is equipped with a bearing top seat (4), the top end of the bearing top seat (4) is provided with an injection port (5), and the injection port (5) is connected to the junction box injection upper mold (12). The side wall of the injection molding upper template (3) is provided with a pressure relief port (13), and the other side wall of the injection molding upper template (3) is equipped with a handle (14).

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