An injection mold

Abstract

This utility model relates to the field of injection mold technology, specifically an injection mold; it includes a base plate, a guide rod disposed on the top of the base plate, a top plate disposed on the top of the guide rod, a cylinder, a lower mold, a preheating mechanism, and an injection port; the cylinder is disposed on the top of the top plate; the lower mold is disposed on the outside of the guide rod; the preheating mechanism is disposed on the outside of the lower mold; and the injection port is disposed on the upper mold. Through the preheating mechanism, hot air blown by a blower enters the preheating pipe, and the rotation of the spiral blades rapidly and evenly distributes the heat to the upper mold. When the preheating temperature is too high, a cooling pipe cools the preheating pipe, thus keeping the preheating temperature of the upper mold within a stable range. This ensures uniform melt flow and allows for relatively consistent cooling and solidification, reducing the extra waiting time required due to uneven cooling caused by temperature differences, thereby improving overall production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold. Background Technology

[0002] Injection molds are tools used to produce plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used to mass-produce certain complex-shaped parts. Specifically, it refers to injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining the molded product after cooling and solidification.

[0003] Chinese Patent CN210758943U discloses an injection mold with easy heat dissipation, including a top plate, a bottom plate, a lower mold, and an upper mold, as well as a base. Two oppositely distributed side plates are installed on the top surface of the base. The injection mold is mounted on the top surface of the base via the bottom plate and is located inside the two side plates. Cooling fans are installed on the opposite surfaces of the two side plates. Inlet pipes and outlet pipes are installed on the two sides of the upper mold, and cooling channels communicating with both the inlet and outlet pipes are formed inside the upper mold. The injection mold of this utility model can cool the mold from both the outside and the inside simultaneously through the cooling fans and cooling channels, resulting in high cooling efficiency and high molding efficiency of plastic parts. After the upper and lower molds are closed, a manual auxiliary stabilizing component is used for further stabilization to prevent the mold from shaking during injection, thereby improving stability and the quality of the plastic parts.

[0004] However, the above-mentioned publicly disclosed solutions have the following shortcomings: existing injection molds cannot be preheated before injection, which makes the injection plastic easy to solidify before molding and affect the injection effect. Utility Model Content

[0005] The purpose of this invention is to address the problem in the prior art that the mold cannot be preheated before injection molding, and to propose an injection mold.

[0006] The technical solution of this utility model: an injection mold, including a base plate, a guide rod disposed on the top of the base plate, and a top plate disposed on the top of the guide rod; further comprising:

[0007] The cylinder is located at the top of the top plate. A push rod is provided at the output end of the cylinder, and an upper mold is provided at the bottom of the push rod. The upper mold and the guide rod are slidably connected. After the cylinder is started, the upper mold is moved on the guide rod through the push rod.

[0008] The lower mold is located on the outside of the guide rod and is used to perform injection molding after closing with the upper mold.

[0009] The preheating mechanism is located on the outside of the lower mold and is used to preheat the lower mold in all directions before injection and stabilize the preheating temperature within a certain range.

[0010] And the injection port, which is located on the upper mold, is divided into two parts: the upper part is inverted cone-shaped and the lower part is thin tube-shaped, so that the plastic can be quickly injected into the cavity formed by the upper mold and the lower mold.

[0011] Preferably, the preheating mechanism includes a preheating component and a stabilizing component;

[0012] The preheating component is located on the outside of the lower mold and is used to preheat the lower mold before injection molding.

[0013] The stabilizing component is installed on the preheating component to control the preheating stability of the preheating component within a certain range.

[0014] Preferably, the preheating assembly includes a heating element, a preheating tube, a motor, and a rotating shaft;

[0015] The preheating tube is located on the outside of the lower mold, the heating tube is located on the outside of the preheating tube, the motor is located on the outside of the preheating tube, the rotating shaft is located at the output end of the motor, the outside of the rotating shaft is provided with spiral blades, there are two motors symmetrically arranged about the preheating tube, and a connecting ring two is provided on the inside of the preheating tube, the inside of the connecting ring two is connected to the outside of the lower mold.

[0016] Preferably, the stabilizing components include a cooling tube, a heat transfer rod, a controller, and a moving rod;

[0017] The cooling tube is located at the top of the preheating tube. A connecting ring is located inside the cooling tube. The heat transfer rod is located inside the cooling tube. The controller is located at the bottom of the heat transfer rod. The moving rod is located on the side of the controller. A sealing plate is located at the top of the moving rod. A sealing plate is located on the outside of the sealing plate. An air inlet is located on the cooling tube. A cold air generator is located on the outside of the cooling tube. The output end of the cold air generator is aligned with the air inlet.

[0018] Preferably, it also includes a demolding mechanism, which includes a connecting block, a pressing rod, and a demolding assembly;

[0019] The connecting block is located on the side of the upper mold, and the pressing rod is located at the bottom of the connecting block;

[0020] The demolding assembly is located on top of the base plate and is used to remove the workpiece from the mold after it has cooled down from the injection mold.

[0021] Preferably, the demolding assembly includes a demolding rod, a connecting plate, a telescopic rod, and a spring;

[0022] The telescopic rod is located at the top of the base plate, the spring is located on the outside of the telescopic rod, the connecting plate is located at the top of the telescopic rod, and the demolding rod is located at the top of the connecting plate.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] 1. Through the preheating mechanism, hot air blown out by the blower enters the preheating pipe and the heat is quickly and evenly distributed and transferred to the upper mold through the rotation of the spiral blades. When the preheating temperature is too high, the cooling pipe cools the preheating pipe, so that the preheating temperature of the upper mold is within a stable range. This ensures uniform flow of the melt and avoids problems such as insufficient filling and material shortage caused by uneven temperature. It makes the product have a complete appearance and accurate dimensions, and can cool and solidify at a relatively uniform speed, reducing the extra waiting time required due to uneven local cooling caused by temperature differences, thereby improving the overall production efficiency.

[0025] 2. By setting up the demolding mechanism, when the mold is closed, the pressing rod pushes down to squeeze the demolding rod. After the injection molding is completed and the mold is separated, the demolding rod rebounds under the action of the spring, thereby pushing out the finished product. This reduces the time required for manual part removal, including the time for a series of actions such as opening the mold, taking out the product, and closing the mold. It can also avoid damage to the product caused by these human factors and ensure the appearance quality and dimensional accuracy of the product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of the demolding mechanism;

[0028] Figure 3 This is a schematic diagram of the preheating mechanism;

[0029] Figure 4 This is a schematic diagram of the internal structure of the preheating mechanism.

[0030] Reference numerals: 1. Base plate; 2. Guide rod; 3. Top plate; 4. Cylinder; 5. Push rod; 601. Upper mold; 602. Connecting block; 603. Pressing rod; 604. Injection port; 605. Demolding rod; 606. Connecting plate; 607. Telescopic rod; 608. Spring; 701. Preheating pipe; 702. Cooling pipe; 703. Heating pipe; 704. Motor; 705. Rotating shaft; 706. Spiral blade; 707. Heat transfer rod; 708. Controller; 709. Moving rod; 710. Sealing plate; 711. Sealing plate; 712. Cold air generator; 713. Air inlet; 714. Connecting ring one; 715. Connecting ring two; 716. Lower mold. Detailed Implementation

[0031] Example 1

[0032] like Figures 1-4As shown, the present invention proposes an injection mold, which includes a base plate 1, a guide rod 2 disposed on the top of the base plate 1, a top plate 3 disposed on the top of the guide rod 2, a cylinder 4, a lower mold 716, a preheating mechanism, and an injection port 604.

[0033] The cylinder 4 is located on the top of the top plate 3. The output end of the cylinder 4 is equipped with a push rod 5. The bottom of the push rod 5 is equipped with an upper mold 601. The upper mold 601 and the guide rod 2 are slidably connected. After the cylinder 4 is started, the push rod 5 drives the upper mold 601 to move on the guide rod 2.

[0034] The lower mold 716 is located on the outside of the guide rod 2 and is used to perform injection molding after closing with the upper mold 601;

[0035] The preheating mechanism is located on the outside of the lower mold 716 and is used to preheat the lower mold 716 in all directions before injection and stabilize the preheating temperature within a certain range.

[0036] Injection port 604 is provided on the upper mold 601. Injection port 604 is divided into two parts: the upper part is inverted cone shape and the lower part is thin tube shape, so that the injection plastic can quickly enter the cavity formed by the upper mold 601 and the lower mold 716. The inverted cone shape of the upper part of injection port 604 can make the injection plastic quickly enter the cavity formed by the upper mold 601 and the lower mold 716, thereby avoiding heat loss of the injection plastic during the flow process.

[0037] The preheating mechanism includes a preheating component and a stabilizing component. The preheating component is located on the outside of the lower mold 716 and is used to preheat the lower mold 716 before injection molding. The stabilizing component is located on the preheating component and is used to stabilize and control the preheating of the preheating component within a certain range. The preheating component includes a heating tube 703, a preheating tube 701, a motor 704, and a rotating shaft 705. The preheating tube 701 is located on the outside of the lower mold 716, the heating tube 703 is located on the outside of the preheating tube 701, the motor 704 is located on the outside of the preheating tube 701, and the rotating shaft 705 is located at the output end of the motor 704. A spiral blade 706 is provided on the outside of the rotating shaft 705. Two motors 704 are symmetrically arranged about the preheating tube 701. A connecting ring 2 715 is provided on the inner side of the preheating tube 701. The inner side of the connecting ring 2 715 is connected to the outer side of the lower mold 716. The connecting ring 2 715 is made of heat-conducting material, and the preheating tube 701 is made of heat-insulating material. The stabilizing assembly includes a cooling pipe 702, a heat transfer rod 707, a controller 708, and a moving rod 709. The cooling pipe 702 is located at the top of the preheating pipe 701, and a connecting ring 714 is located inside the cooling pipe 702. The heat transfer rod 707 is located inside the cooling pipe 702, the controller 708 is located at the bottom of the heat transfer rod 707, and the moving rod 709 is located on the side of the controller 708. A sealing plate 711 is located at the top of the moving rod 709, and a sealing plate 710 is located on the outside of the sealing plate 711. An air inlet 713 is located on the cooling pipe 702, and a cold air generator 712 is located on the outside of the cooling pipe 702. The output end is aligned with the air inlet 713. The blower generates hot air and blows it into the preheating tube 701. The motor 704 drives the rotating shaft 705 to rotate. The rotating shaft 705 drives the spiral blades 706 to rotate. When the spiral blades 706 rotate, they drive the internal hot air to flow rapidly, thus quickly filling the preheating tube 701. When the temperature inside the preheating tube 701 is too high, the temperature is transferred to the controller 708 through the heat transfer rod 707. The controller 708 controls the moving rod 709 to rise. When the moving rod 709 rises, it drives the piston block to disengage from the through slot, thereby delivering the cold air generated by the cold air generator 712 into the preheating tube 701, thereby appropriately reducing the temperature inside the preheating tube 701.

[0038] Example 2

[0039] like Figure 2 As shown, this utility model proposes an injection mold, and compared with Embodiment 1, this embodiment details the structure of the demolding mechanism.

[0040] The demolding mechanism includes a connecting block 602, a pressing rod 603, and a demolding assembly. The connecting block 602 is located on the side of the upper mold 601, and the pressing rod 603 is located at the bottom of the connecting block 602. Multiple connecting blocks 602 are symmetrically arranged about the upper mold 601. The demolding assembly is located on the top of the base plate 1 and is used to remove the workpiece after injection molding and cooling from the mold. The demolding assembly includes a demolding rod 605, a connecting plate 606, a telescopic rod 607, and a spring 608. The telescopic rod 607 is located on the top of the base plate 1, the spring 608 is located on the outside of the telescopic rod 607, the connecting plate 606 is located on the top of the telescopic rod 607, and the demolding rod 605 is located on the top of the connecting plate 606. The demolding rod 605 is slidably connected to the lower mold 716, and when the spring 608 is in its natural state, the demolding rod 605 is located in the cavity of the lower mold 716. Inside, the pressing rod 603 moves downward under the drive of the cylinder 4. During the movement, the pressing rod 603 will press down on the connecting plate 606, thereby driving the demolding rod 605 to move downward. When the upper mold 601 and the lower mold 716 are closed, the top of the demolding rod 605 is just flush with the bottom of the inner wall of the lower mold 716. After the injection molding is completed, the cylinder 4 drives the pressing rod 603 to rise. At this time, the demolding rod 605 rebounds under the action of the spring 608, thereby pushing the finished product out of the mold.

[0041] In summary, when using this utility model, the cylinder 4 is activated, and the cylinder 4 drives the upper mold 601 to move downwards via the push rod 5 until it stops moving when connected to the lower mold 716. During this process, the pressing rod 603 moves downwards under the drive of the cylinder 4. During the movement, the pressing rod 603 will press down on the connecting plate 606, thereby driving the demolding rod 605 to move downwards. Then, the motor 704, controller 708, blower, and cold air generator 712 are activated. The blower generates hot air that blows into the preheating tube 701. The motor 704 drives the rotating shaft 705 to rotate, and the rotating shaft 705 drives the spiral blades 706 to rotate. When the spiral blades 706 rotate, they drive the internal hot air to flow rapidly, thereby quickly filling the preheating tube. Inside 701, when the temperature inside the preheating pipe 701 is too high, the temperature is transferred to the controller 708 through the heat transfer rod 707. The controller 708 controls the moving rod 709 to rise. When the moving rod 709 rises, it drives the piston block to disengage from the through groove, thereby delivering the cold air generated by the cold air generator 712 to the preheating pipe 701, thereby appropriately reducing the temperature inside the preheating pipe 701, so that the preheating temperature of the lower mold 716 is controlled within a certain range. Then, the injection plastic is introduced into the injection port 604 and then enters the cavity generated by mold closing. After injection molding is completed, cooling is performed. After cooling is completed, the cylinder 4 drives the pressing rod 603 to rise. At this time, the demolding rod 605 rebounds under the action of the spring 608, thereby pushing the finished product out of the mold.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An injection mold, comprising a base plate (1), a guide rod (2) disposed on the top of the base plate (1), and a top plate (3) disposed on the top of the guide rod (2); characterized in that, Also includes: Cylinder (4), cylinder (4) is located on the top of top plate (3), and push rod (5) is provided at the output end of cylinder (4). Upper mold (601) is provided at the bottom of push rod (5). Upper mold (601) and guide rod (2) are slidably connected. After cylinder (4) is started, push rod (5) drives upper mold (601) to move on guide rod (2). The lower mold (716) is located on the outside of the guide rod (2) and is used to perform injection molding after closing with the upper mold (601); The preheating mechanism is located on the outside of the lower mold (716) and is used to preheat the lower mold (716) in all directions before injection and stabilize the preheating temperature within a certain range. And injection port (604), which is located on the upper mold (601). The injection port (604) is divided into two parts: the upper part is inverted cone shape and the lower part is thin tube shape, so that the injection plastic can quickly enter the cavity formed by the upper mold (601) and the lower mold (716).

2. The injection mold according to claim 1, characterized in that, The preheating mechanism includes a preheating component and a stabilizing component; The preheating component is located on the outside of the lower mold (716) and is used to preheat the lower mold (716) before injection molding. The stabilizing component is installed on the preheating component to control the preheating stability of the preheating component within a certain range.

3. The injection mold according to claim 2, characterized in that, The preheating assembly includes a heating element (703), a preheating element (701), a motor (704), and a rotating shaft (705); A preheating tube (701) is located on the outside of the lower mold (716), a heating tube (703) is located on the outside of the preheating tube (701), a motor (704) is located on the outside of the preheating tube (701), a rotating shaft (705) is located at the output end of the motor (704), a spiral blade (706) is located on the outside of the rotating shaft (705), two motors (704) are symmetrically arranged about the preheating tube (701), a connecting ring II (715) is located on the inside of the preheating tube (701), and the inside of the connecting ring II (715) is connected to the outside of the lower mold (716).

4. The injection mold according to claim 3, characterized in that, The stabilizing components include a cooling tube (702), a heat transfer rod (707), a controller (708), and a moving rod (709); A cooling tube (702) is located at the top of the preheating tube (701). A connecting ring (714) is located inside the cooling tube (702). A heat transfer rod (707) is located inside the cooling tube (702). A controller (708) is located at the bottom of the heat transfer rod (707). A moving rod (709) is located on the side of the controller (708). A sealing plate (711) is located at the top of the moving rod (709). A sealing plate (710) is located on the outside of the sealing plate (711). An air inlet (713) is located on the cooling tube (702). A cold air generator (712) is located on the outside of the cooling tube (702). The output end of the cold air generator (712) is aligned with the air inlet (713).

5. The injection mold according to claim 1, characterized in that, It also includes a demolding mechanism, which comprises a connecting block (602), a pressing rod (603), and a demolding assembly; The connecting block (602) is located on the side of the upper mold (601), and the pressing rod (603) is located at the bottom of the connecting block (602); The demolding assembly is located on top of the base plate (1) and is used to remove the workpiece after injection molding and cooling from the mold.

6. The injection mold according to claim 5, characterized in that, The demolding assembly includes a demolding rod (605), a connecting plate (606), a telescopic rod (607), and a spring (608); The telescopic rod (607) is located on the top of the base plate (1), the spring (608) is located on the outside of the telescopic rod (607), the connecting plate (606) is located on the top of the telescopic rod (607), and the demolding rod (605) is located on the top of the connecting plate (606).

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