Plastic toy injection molding mold

Abstract

The invention relates to the technical field of injection molds, and discloses a plastic toy injection molding mold which structurally comprises a base, a demolding mechanism, a lower mold base, an upper mold base, a positioning lock catch and a first temperature control pipeline. A forming mold can be quickly positioned and mounted, the mold can be conveniently replaced, an injection mold can be replaced according to production requirements, cavity molds of different shapes can be assembled, the cost is saved, and the machining efficiency is improved; the temperature of the cooling liquid in the two groups of temperature control pipelines is adjusted, so that the temperature of the cooling liquid can be accurately adjusted and controlled according to different wall thicknesses of injection-molded toys, the shrinkage defect occurrence rate of thick-wall toys during production is reduced, and the appearance flatness of the toys is improved.

Description

Technical Field

[0001] This invention belongs to the field of injection molds, and specifically relates to an injection mold for plastic toys. Background Technology

[0002] Plastic toys are non-electric toys made of synthetic resin as the main component and processed through injection molding, blow molding and other processes. They are designed for children to play with. Plastic toys are widely used in the toy industry due to their diverse shapes and low cost. There are many types of these toys, including building blocks, dolls, water toys, teething toys, rattles and so on. Its core production relies on injection molding molds. This process involves injecting heated and molten plastic into the mold cavity under high pressure, and then cooling and solidifying it to obtain the final molded product. In the existing plastic toy injection molding process, most existing molds can only produce a single product. When it is necessary to injection mold products with different structures, it is very inconvenient to change the molding mold, which reduces the efficiency of production. In addition, since the cooling water flows in a single pipe, uneven cooling can cause local depressions, which affects the appearance quality. This application proposes a plastic toy injection molding mold to improve upon the aforementioned defects. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a plastic toy injection molding mold with the functions of quick mold replacement and uniform cooling.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A plastic toy injection molding mold includes a base, a demolding mechanism, a lower mold base, an upper mold base, and an injection port. The lower mold base is mounted on the base, and the interior of the lower mold base is provided with a demolding mechanism that can eject the injection mold. The upper mold base is located directly above the lower mold base, and an injection port is provided at the center of the upper mold base, through which injection molding can be performed on the interior of the mold.

[0005] In one specific implementation scheme, the lower mold base includes a placement cavity, a positioning latch, a molding die, and a locking plate. The placement cavity is opened at the top of the lower mold base. Two sets of positioning latches are installed at the bottom of the placement cavity. A molding die for a plastic toy is movably embedded in the placement cavity. A locking plate is fixed at the bottom of the molding die. The position of the locking plate at the bottom of the molding die corresponds to the position of the positioning latch.

[0006] In one specific implementation, the locking plate is provided with multiple sets of insertion blocks, and the insertion blocks are arranged vertically in pairs on the locking plate, with limit holes provided on each of the insertion blocks.

[0007] In one specific implementation scheme, the positioning lock includes an outer cylinder, a spring, an anti-push-out seat, a locking assembly, and a sliding groove. The bottom of the outer cylinder is connected to the placement cavity. A spring is installed on the inner bottom of the outer cylinder. The other end of the spring is connected to the bottom of the anti-push-out seat. Two sets of locking assemblies are provided directly above the anti-push-out seat. The two sets of locking assemblies are symmetrically arranged and fixed to the outer cylinder. The locking assembly has several sliding grooves, which slide and engage with the anti-push-out seat.

[0008] In one specific implementation, the locking assembly includes an inner cylinder, a return spring, a top ball, and an arc-shaped chamfer. The return spring is installed at the inner center of the inner cylinder, and the other end of the return spring is connected to the inner wall of the locking assembly. The top of the inner cylinder is rotatably fitted with a top ball, and the top of the inner cylinder has an arc-shaped chamfer.

[0009] In one specific implementation, the inner cylinder extends outward under the push-out and reset action of the internal reset spring, and engages with the limiting hole provided on the inserted locking plate. The locking plate is locked in position by the top ball being embedded in the limiting hole.

[0010] In one specific implementation scheme, the lower mold base includes a water inlet, a water outlet, a first temperature control pipe, a temperature sensor, a flow guiding component, and a second temperature control pipe. The lower mold base has a first temperature control pipe inside, with the water inlet and water outlet connected to the pipe. A temperature sensor capable of detecting the temperature of the coolant inside the pipe is installed at one end inside the first temperature control pipe. Several flow guiding components are installed inside the first temperature control pipe, with their ends connected to each other. A second temperature control pipe is provided on one side of the first temperature control pipe.

[0011] In one specific implementation scheme, the second temperature control pipe has the same structure as the first temperature control pipe and is symmetrically arranged inside the lower mold base. The coolant temperature inside the first temperature control pipe and the second temperature control pipe is different, which can be adjusted according to the thickness of the toy model being injection molded inside the molding die.

[0012] In one specific implementation, the temperature sensor can monitor the temperature of the coolant inside the two sets of temperature-controlled pipes in real time and feed back the cooling data to the external control unit in real time.

[0013] In one specific implementation, the flow guiding assembly includes a main shaft and spiral flow guiding vanes. The main shaft has a plurality of spiral flow guiding vanes arranged in a ring array, and the main shafts of two adjacent sets of the flow guiding assemblies are assembled and connected to each other.

[0014] In one specific implementation, the spiral guide vanes are forced to rotate by a plurality of spiral guide vanes when cooling water passes through, which can transform the laminar flow of cooling water into strong turbulent flow.

[0015] In one specific implementation scheme, the internal structure of the upper mold base is the same as that of the lower mold base, and both have symmetrically arranged water inlet, water outlet, first temperature control pipe, temperature sensor, flow guiding component and second temperature control pipe.

[0016] According to the above-mentioned technical solution, the plastic toy injection molding mold of the present invention has the following beneficial effects: (1) By using a locking plate and a positioning lock to engage the lower mold base and the molding mold, the present invention can quickly position and install the molding mold, and facilitate the replacement of the mold. It can replace the injection mold according to the production needs, assemble cavity molds of different shapes, save costs and improve processing efficiency.

[0017] (2) The present invention provides chamfers on both the inner cylinder and the limiting hole, and the two sets of chamfers are in contact and fit together. By applying an upward pulling force to the forming mold, the top ball can be separated from the limiting hole under the action of the chamfer, thereby achieving the function of quick mold replacement.

[0018] (3) The present invention provides two sets of temperature control pipes inside the lower mold base. By adjusting the temperature of the coolant inside the two sets of temperature control pipes, the temperature of the coolant can be precisely controlled for different wall thicknesses of injection molded toys, thereby reducing the shrinkage defect rate of thick-walled toys during production and improving the appearance flatness of the toys.

[0019] (4) The present invention provides a flow guiding component inside the temperature control pipe. When the cooling water passes through, the spiral guide plate is forced to rotate, which transforms the laminar flow of the cooling water into strong turbulent water. The turbulent water can continuously scour the pipe wall of the temperature control pipe, so that the heat of the pipe wall can be quickly carried away, making the temperature of the mold more uniform, and rapidly cooling the mold inside the molding mold. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a plastic toy injection molding mold in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the lower mold base in an embodiment of this application; Figure 3 This is a schematic diagram of the locking plate in an embodiment of this application; Figure 4This is a schematic diagram of the positioning latch structure in an embodiment of this application; Figure 5 This is an exploded view of the positioning latch in the embodiments of this application; Figure 6 This is a schematic diagram of the locking assembly in an embodiment of this application; Figure 7 This is a schematic diagram of the assembly of the locking plate and the positioning latch in an embodiment of this application; Figure 8 This is a schematic diagram of the internal cross-section of the lower mold base in an embodiment of this application; Figure 9 This is a schematic diagram of the flow guiding component in an embodiment of this application.

[0021] In the diagram: Base-1, Demolding Mechanism-2, Lower Mold Base-3, Upper Mold Base-4, Injection Port-5, Placement Cavity-31, Positioning Lock-32, Molding Mold-33, Locking Plate-34, Insertion Block-341, Limiting Hole-342, Outer Cylinder-321, Spring-322, Anti-ejection Seat-323, Locking Assembly-324, Slide Groove-325, Inner Cylinder-11, Reset Spring-12, Ejector Ball-13, Arc Chamfer-14, Water Inlet-31, Water Outlet-32, First Temperature Control Pipe-33, Temperature Sensor-34, Flow Guide Assembly-35, Second Temperature Control Pipe-36, Main Shaft-351, Spiral Flow Guide Plate-352. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: Please refer to Figures 1-7 The specific embodiments of the present invention are as follows: A plastic toy injection molding mold includes a base 1, a demolding mechanism 2, a lower mold base 3, an upper mold base 4, and an injection port 5. The lower mold base 3 is mounted on the base 1. The lower mold base 3 is equipped with a demolding mechanism 2 inside, which can eject the injection mold. The upper mold base 4 is located directly above the lower mold base 3. The lower mold base 3 and the upper mold base 4 are limited by a column pin, so that the lower mold base 3 and the upper mold base 4 are at the same center. The injection port 5 is opened at the center of the upper mold base 4, through which the mold can be injection molded.

[0024] Please see Figures 2-3The lower mold base 3 includes a placement cavity 31, positioning latches 32, a molding die 33, and a locking plate 34. The placement cavity 31 is opened at the top of the lower mold base 3. Two sets of positioning latches 32 are installed at the bottom of the placement cavity 31. The two sets of positioning latches 32 are installed diagonally in the placement cavity 31. The molding die 33 of the plastic toy is movably embedded in the placement cavity 31. The bottom of the molding die 33 is fixed with a locking plate 34. The position of the locking plate 34 at the bottom of the molding die 33 corresponds to the position of the positioning latches 32. When the molding die 33 is installed in the placement cavity 31, the locking plate 34 will be inserted into the positioning latches 32 to fix the position of the molding die 33.

[0025] Please see Figures 2-3 The locking plate 34 is provided with multiple sets of insertion blocks 341. Several insertion blocks 341 are vertically distributed in pairs on the locking plate 34 to form two symmetrically spliced ​​"L" shaped structures. Each insertion block 341 has a limiting hole 342. The limiting hole 342 has a tapered chamfer on the side near the positioning latch 32.

[0026] Please see Figures 4-5 The positioning lock 32 includes an outer cylinder 321, a spring 322, an anti-push-out seat 323, a locking assembly 324, and a sliding groove 325. The bottom of the outer cylinder 321 is connected to the placement cavity 31. A spring 322 is installed on the bottom inner side of the outer cylinder 321. The other end of the spring 322 is connected to the bottom of the anti-push-out seat 323. Two sets of locking assemblies 324 are provided directly above the anti-push-out seat 323. The two sets of locking assemblies 324 are symmetrically arranged and fixed to the outer cylinder 321. The locking assembly 324 has several sliding grooves 325, which slide and engage with the anti-push-out seat 323.

[0027] Please see Figure 6 The locking assembly 324 includes an inner cylinder 11, a return spring 12, a top ball 13, and an arc-shaped chamfer 14. The return spring 12 is installed at the inner center of the inner cylinder 11. The other end of the return spring 12 is connected to the inner wall of the locking assembly 324. The top of the inner cylinder 11 is rotatably fitted with the top ball 13. The top of the inner cylinder 11 is provided with an arc-shaped chamfer 14.

[0028] Please see Figures 6-7 Under the push-out reset action of the internal reset spring 12, the inner cylinder 11 extends outward and engages with the limiting hole 342 on the inserted locking plate 34. The locking plate 34 is locked in position by the top bead 13 embedded in the limiting hole 342. At this time, the arc chamfer 14 on the inner cylinder 11 contacts and fits with the conical chamfer on the limiting hole 342. When it is necessary to remove the locking plate 34, an upward pulling force is applied to it. Under the action of the chamfer, the top bead 13 can be separated from the limiting hole 342.

[0029] Please see Figure 5 The initial position of the anti-ejection seat 323 is located at the top of the slide groove 325 due to the upward action of the spring 322. At this time, the anti-ejection seat 323 will limit the position of the inner cylinder 11 inside the locking assembly 324. At the same time, the compression of the return spring 12 will restrict the inner cylinder 11 inside the locking assembly 324. At this time, the top ball 13 is in contact with the anti-ejection seat 323. When the locking plate 34 is inserted into the positioning latch 32, it will contact the anti-ejection seat 323 and push the anti-ejection seat 323 downward until the limiting hole 342 on the locking plate 34 contacts and engages with the top ball 13 and stops.

[0030] Please see Figures 3-7 When it is necessary to install the molding mold 33 inside the placement cavity 31, the two sets of locking plates 34 provided at the bottom of the molding mold 33 correspond to and are inserted into the positioning lock 32 installed in the placement cavity 31. With the help of the limiting hole 342 on the locking plate 34 and the top ball 13 installed on the locking assembly 324, the molding mold 33 can be positioned and installed inside the lower mold base 4.

[0031] Example 2: Please refer to Figures 1-9 The specific embodiments of the present invention are as follows: Please see Figures 1-8 The lower mold base 3 includes a water inlet 31, a water outlet 32, a first temperature control pipe 33, a temperature sensor 34, a flow guiding component 35, and a second temperature control pipe 36. The lower mold base 3 has a first temperature control pipe 33 inside, and the water inlet 31 and the water outlet 32 ​​are connected to the pipe of the first temperature control pipe 33. A temperature sensor 34 capable of detecting the temperature of the coolant inside the pipe is installed at one end inside the first temperature control pipe 33. Several flow guiding components 35 are installed inside the first temperature control pipe 33, and the two ends of the several flow guiding components 35 are connected to each other. The second temperature control pipe 36 is provided on one side of the first temperature control pipe 33.

[0032] Please see Figure 8 The second temperature control pipe 36 has the same structure as the first temperature control pipe 33 and is symmetrically arranged inside the lower mold base 3. The coolant temperature inside the first temperature control pipe 33 and the second temperature control pipe 36 is different, which can be adjusted according to the thickness of the toy model being injection molded inside the molding mold 33. When the corresponding toy model is a thick-walled area, the coolant temperature inside the pipe is 15-20°C. When the corresponding toy mold is a thin-walled area, the coolant temperature inside the pipe is 20-25°C. By precisely controlling the temperature of the coolant for different wall thicknesses of the injection molded toy, the shrinkage defect rate of thick-walled toys during production is reduced, thereby improving the appearance flatness of the toy.

[0033] Please see Figure 8Temperature sensor 34 can monitor the temperature of the coolant inside the two sets of temperature control pipes in real time and feed back the cooling data to the external control unit in real time. When the coolant temperature exceeds the initial set temperature, it will send a signal to the control unit to remind the operator to replace the internal coolant.

[0034] Please see Figures 8-9 The flow guiding component 35 includes a main shaft 351 and spiral flow guiding vanes 352. Several spiral flow guiding vanes 352 are arranged in a ring on the main shaft 351. The main shafts 351 of adjacent flow guiding components 35 are assembled and connected to each other.

[0035] Please see Figures 8-9 When cooling water passes through, the spiral guide vanes 352 are forced to rotate by the spiral guide vanes 352, which can transform the laminar flow of cooling water into strong turbulent water. The turbulent water can continuously scour the pipe wall of the temperature control pipe, so that the heat of the pipe wall can be quickly carried away, making the temperature of the mold more uniform, and rapidly cooling the mold inside the molding mold 33.

[0036] Please see Figures 1-9 The internal structure of the upper mold base 4 is the same as that of the lower mold base 3. Both have symmetrically arranged water inlet 31, water outlet 32, first temperature control pipe 33, temperature sensor 34, flow guide component 35 and second temperature control pipe 36, which can cooperate with the lower mold base 3 to uniformly and quickly cool the plastic toy inside the molding die 33.

[0037] Based on the above embodiments, the specific working principle is as follows: When it is necessary to perform injection molding on plastic toys, the two sets of locking plates 34 provided at the bottom of the molding mold 33 correspond to the positioning locks 32 in the placement cavity 31 provided on the lower mold base 3, and are inserted into the positioning locks 32. With the help of the several limiting holes 342 provided on the locking plate 34, they can engage with the top ball 13 installed on the locking assembly 324 to fix the position of the locking plate 34, thereby positioning the molding mold 33 on the lower mold base 4. After the upper mold base 4 and the lower mold base 3 are closed, the plastic toy can be injection molded through the injection port 5. After the injection is completed, the coolant is transported and flowed through the first temperature control pipe 33 and the second temperature control pipe 36 provided inside the upper mold base 3 and the lower mold base 4. The temperature of the coolant is adjusted according to the wall thickness of the produced plastic toy to ensure the flatness of the produced toy. When it is necessary to replace the molding die 33, an upward pulling force is applied to it. Under the action of the chamfer, the installation between the top ball 13 and the limiting hole 342 can be separated, thereby replacing the molding die 33.

[0038] This invention solves the problem that most existing molds can only produce a single product. When it is necessary to injection mold products with different structures, it is very inconvenient to change the molding mold, which reduces the efficiency of production. In addition, since the cooling water flows in a single pipe, uneven cooling can cause local depressions, which affects the appearance quality. This invention, through the combination of the above-mentioned components, enables the lower mold base and the molding mold to be movably engaged via a locking plate and a positioning lock, allowing for quick positioning and installation of the molding mold. It also facilitates mold replacement, allowing for the replacement of injection molds according to production needs and the assembly of cavity molds with different shapes. This saves costs and improves processing efficiency. Furthermore, chamfers are provided on both the inner cylinder and the limiting hole, and the two sets of chamfers are in contact and fit together. By applying an upward pulling force to the molding mold, the chamfers can separate the ejector ball from the limiting hole, thereby achieving the function of quick mold replacement. By utilizing two sets of temperature control pipes inside the lower mold base, the temperature of the coolant inside these pipes can be precisely controlled for different wall thicknesses of injection molded toys. This reduces the shrinkage defect rate of thick-walled toys during production, thereby improving the smoothness of the toy's appearance.

[0039] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A plastic toy injection molding mold, comprising a base (1), a lower mold base (3) located on the base (1), a demolding mechanism (2) installed inside the lower mold base (3), and a mold base (4) located directly above the lower mold base (3), wherein the lower mold base (3) and the upper mold base (4) are limited by a column pin, and an injection port (5) is provided at the center of the upper mold base (4); characterized in that: The lower mold base (3) includes a placement cavity (31) and two sets of positioning latches (32) installed at the bottom of the placement cavity (31). The two sets of positioning latches (32) are installed diagonally in the placement cavity (31). A forming mold (33) is movably embedded in the placement cavity (31). A locking plate (34) is fixed at the bottom of the forming mold (33). The position of the locking plate (34) at the bottom of the forming mold (33) corresponds to the position of the positioning latches (32). The positioning lock (32) includes an outer cylinder (321), a spring (322) located at the bottom of the inner side of the outer cylinder (321), and an anti-push-out seat (323) located at the other end of the spring (322). Two sets of locking components (324) are provided directly above the anti-push-out seat (323). The two sets of locking components (324) are symmetrically arranged and fixed to the outer cylinder (321). Several sliding grooves (325) are provided on the locking components (324). The lower mold base (3) includes a first temperature control pipe (33), an inlet end (31) and an outlet end (32) connected to the first temperature control pipe (33), a temperature sensor (34) installed inside the first temperature control pipe (33), and a plurality of flow guiding components (35) located inside the first temperature control pipe (33). The plurality of flow guiding components (35) are connected to each other at both ends. A second temperature control pipe (36) is provided on one side of the first temperature control pipe (33).

2. The injection mold for a plastic toy according to claim 1, characterized in that: The locking plate (34) is provided with multiple sets of insertion blocks (341). Several of the insertion blocks (341) are vertically distributed in pairs on the locking plate (34) to form two symmetrically spliced ​​"L" shaped structures. Each of the insertion blocks (341) has a limiting hole (342). The limiting hole (342) has a tapered chamfer on the side near the positioning latch (32).

3. The injection mold for a plastic toy according to claim 1, characterized in that: The locking assembly (324) includes an inner cylinder (11), a return spring (12) located at the center of the inner cylinder (11), and a top ball (13) for rotating with the top of the inner cylinder (11). The top of the inner cylinder (11) is provided with an arc-shaped chamfer (14).

4. The injection mold for a plastic toy according to claim 3, characterized in that: Under the push-out reset action of the internal reset spring (12), the inner cylinder (11) will extend outward and engage with the limiting hole (342) on the inserted locking plate (34). At this time, the arc chamfer (14) on the inner cylinder (11) and the conical chamfer on the limiting hole (342) will come into contact and fit together.

5. The injection mold for a plastic toy according to claim 1, characterized in that: The initial position of the anti-ejection seat (323) is located at the top of the slide groove (325) due to the upward action of the spring (322). At this time, the anti-ejection seat (323) will limit the position of the inner cylinder (11) inside the locking assembly (324), and at the same time, the compression return spring (12) will restrict the inner cylinder (11) inside the locking assembly (324). At this time, the top ball (13) is in contact with the anti-ejection seat (323).

6. The injection mold for a plastic toy according to claim 1, characterized in that: The second temperature control pipe (36) has the same structure as the first temperature control pipe (33) and is symmetrically arranged inside the lower mold base (3). The coolant temperature inside the first temperature control pipe (33) and the second temperature control pipe (36) is different. When the corresponding toy model is a thick-walled area, the coolant temperature inside the pipe is 15-20°. When the corresponding toy mold is a thin-walled area, the coolant temperature inside the pipe is 20-25°.

7. The injection mold for a plastic toy according to claim 1, characterized in that: The temperature sensor (34) can monitor the temperature of the coolant inside the two sets of temperature control pipes in real time and feed back the cooling data to the external control unit in real time.

8. The injection mold for a plastic toy according to claim 1, characterized in that: The flow guiding assembly (35) includes a main shaft (351) and spiral flow guiding blades (352). Several spiral flow guiding blades (352) are arranged in a ring on the main shaft (351). The main shafts (351) of two adjacent sets of flow guiding assemblies (35) are assembled and connected to each other.

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