Resin handicraft injection molding device

Abstract

The application discloses a resin handicraft injection molding device, and particularly relates to the technical field of injection molding devices, which comprises a bottom plate, a lower mold arranged at the top of the bottom plate, an upper mold arranged at the top of the lower mold, an injection pipe arranged at the joint of the lower mold and the upper mold, an injection cylinder arranged at the top of the bottom plate, a sleeve arranged on the side of the injection cylinder away from the lower mold through a sealing bearing, a hollow extrusion plug arranged in the injection cylinder and used for extruding raw materials, and a detachable sealing cover arranged on the side of the hollow extrusion plug facing the sleeve. The sleeve is driven to rotate back and forth by the movement of a linear motor, and the hollow extrusion plug is continuously driven to rotate back and forth, so that the hollow extrusion plug always keeps a moving state during the cooling and solidification of the raw materials, the hollow extrusion plug is prevented from being adhered and fixed due to the solidification of the raw materials, and the subsequent injection molding work is prevented from being affected, thereby improving the injection molding efficiency.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and specifically to an injection molding device for resin crafts. Background Technology

[0002] Resin crafts are decorative items made primarily from synthetic resins (such as unsaturated polyester resin and epoxy resin). They can imitate the effects of copper, crystal, marble, etc., or achieve realistic shapes through dyeing, curing, and other treatments. The contents cover artistic ornaments such as figures, animals, and landscapes, combining practicality and aesthetics.

[0003] Resin crafts have complex and diverse shapes, so they often need to be injection molded, such as the resin craft injection casting device disclosed in the prior art with the publication number CN222387454U.

[0004] Unlike ordinary mold casting, injection molding equipment consists of two parts: the mold body and the injection mechanism. The injection mechanism needs to use external force to drive the molten raw material into the mold. Therefore, the feeding port of the mold is connected to the injection mechanism. The raw material in the mold will connect with the injection mechanism through the feeding port. As a result, when the raw material solidifies, the raw material at the feeding port will connect with the internal components of the injection mechanism, affecting subsequent injection work and reducing injection efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a resin craft injection molding device that uses the movement of a linear motor to drive the sleeve to rotate back and forth, thereby driving the hollow extrusion plug to rotate continuously. This ensures that the hollow extrusion plug remains in motion during the cooling and solidification of the raw material, preventing the hollow extrusion plug from sticking and fixing due to the solidification of the raw material, thus avoiding affecting subsequent injection molding work and improving injection molding efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a resin craft injection molding device, comprising a base plate, a lower mold provided at the top of the base plate, an upper mold provided at the top of the lower mold, an injection pipe provided at the joint between the lower mold and the upper mold, the injection pipe being fixedly connected to the lower mold, an injection cylinder provided at the top of the base plate, and a sleeve provided on the side of the injection cylinder away from the lower mold through a sealing bearing;

[0007] The injection molding cylinder is equipped with a hollow extrusion plug for extruding raw materials. The hollow extrusion plug has a detachable sealing cap on the side facing the sleeve. Two guide rods that penetrate the sleeve are fixed on the sealing cap.

[0008] A gear ring is fixedly provided at the outer end of the sleeve, and a linear motor is fixedly provided at the top of the base plate. The linear motor is located at the bottom of the gear ring, and multiple actuating teeth are fixedly provided at the top of the mover of the linear motor. The mover of the linear motor meshes with the gear ring through the actuating teeth.

[0009] Furthermore, a hydraulic cylinder is fixedly provided at the top of the base plate, a connecting plate is fixedly provided at the top of the hydraulic cylinder, the connecting plate is fixedly provided on the outer surface of the upper mold, and an exhaust hole is fixedly provided at the top of the upper mold, the bottom end of the exhaust hole communicating with the internal cavity of the upper mold.

[0010] Furthermore, a heating plate is installed on the inner wall of the hollow extruder, and a return spring is provided between the sealing cap and the sleeve, with both ends of the return spring fixedly connected to the inner wall of the sleeve and the sealing cap, respectively.

[0011] Furthermore, an iron end plate is provided on the side of the sleeve away from the injection molding cylinder, and the ends of the two guide rods away from the injection molding cylinder are fixedly connected to the iron end plate. An electromagnet is installed on the side of the sleeve facing the iron end plate.

[0012] Furthermore, the injection molding cylinder is provided with a support base at the bottom end, the support base is detachably provided at the top of the base plate, the injection molding cylinder is provided with a feeding hopper at the top, the feeding hopper is fixedly provided with a feeding pipe with a valve at the bottom end, the feeding pipe is fixedly connected to the injection molding cylinder at the bottom end and communicates with the inside of the injection molding cylinder.

[0013] Furthermore, an end cap is fixedly provided at the end of the injection tube away from the lower mold. The end cap is detachably provided at the end of the injection cylinder facing the lower mold, and the injection tube communicates with the inside of the injection cylinder.

[0014] Furthermore, a cooling cylinder is fitted over the outer end of the injection pipe, and multiple heat sinks are fixedly installed on the outer end of the injection pipe. The heat sinks are located inside the cooling cylinder, and water supply pipes with valves are fixedly installed on both sides of the cooling cylinder. The two water supply pipes are the inlet pipe and the outlet pipe, respectively.

[0015] Furthermore, the top of the upper mold is provided with a detachable exhaust hood, the top of the exhaust hood is inlaid with an exhaust mesh, the inside of the exhaust hood is provided with a movable plate, the outer end of the movable plate is fixedly provided with a sealing ring that contacts the inner wall of the exhaust hood, the movable plate is provided with a micro hole that penetrates the movable plate, the top of the movable plate is fixedly provided with a buffer spring, the top of the buffer spring is fixedly connected to the inner wall of the exhaust hood, and the exhaust hole is located inside the exhaust hood and below the movable plate.

[0016] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0017] 1. The raw material is squeezed by a hollow extrusion plug and injected into the mold. After injection, the linear motor drives the sleeve to rotate back and forth, which in turn drives the hollow extrusion plug to rotate back and forth continuously. This keeps the hollow extrusion plug in motion during the cooling and solidification of the raw material, preventing the hollow extrusion plug from sticking and fixing due to the solidification of the raw material, thus avoiding affecting the subsequent injection molding work and improving the efficiency of injection molding.

[0018] 2. By injecting cooling water into the cooling cylinder and using heat sinks to increase the heat dissipation efficiency of the injection pipe, the raw material inside the injection pipe solidifies and solidifies first. The solidified raw material is stuck in the injection pipe and seals the mold cavity itself. This allows the hollow extrusion plug to be removed from the injection pipe, shortening the contact time between the hollow extrusion plug and the raw material, and avoiding prolonged sealing that could cause the hollow extrusion plug to stick to the end cap. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is an overall structural diagram of the present invention;

[0021] Figure 2 For the present invention Figure 1 Enlarged view of section A in the middle;

[0022] Figure 3 This is a structural diagram of the injection molding cylinder of the present invention;

[0023] Figure 4 This is a cross-sectional view of the injection molding barrel of the present invention;

[0024] Figure 5 This is a diagram of the sleeve structure of the present invention;

[0025] Figure 6 This is a cross-sectional view of the cooling cylinder of the present invention;

[0026] Figure 7 This is a structural diagram of the upper and lower molds of the present invention;

[0027] Figure 8 This is a structural diagram of the internal structure of the exhaust hood of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Base plate; 101. Lower mold; 102. Upper mold; 103. Hydraulic cylinder; 104. Connecting plate; 105. Vent hole; 2. Vent cover; 201. Vent mesh; 202. Moving plate; 203. Micro-hole; 204. Buffer spring; 3. Injection cylinder; 301. Support base; 302. End cap;

[0030] 4. Feeding hopper; 401. Feeding pipe; 5. Cooling cylinder; 6. Sleeve; 601. Gear ring; 602. Electromagnet; 603. Guide rod; 604. Iron end plate; 605. Hollow extrusion plug; 606. Heating plate; 607. Sealing cover; 608. Return spring; 7. Injection pipe; 701. Heat sink; 8. Linear motor; 801. Actuating gear. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] This invention provides, for example Figure 1-8 The resin craft injection molding device shown includes a base plate 1, a lower mold 101 at the top of the base plate 1, an upper mold 102 at the top of the lower mold 101, and an injection pipe 7 at the joint between the lower mold 101 and the upper mold 102, which is fixedly connected to the lower mold 101.

[0033] A hydraulic cylinder 103 is fixedly provided at the top of the base plate 1, and a connecting plate 104 is fixedly provided at the top of the hydraulic cylinder 103. The connecting plate 104 is fixedly provided on the outer surface of the upper mold 102. An exhaust hole 105 is fixedly provided at the top of the upper mold 102, and the bottom end of the exhaust hole 105 communicates with the internal cavity of the upper mold 102.

[0034] Before injection molding, the hydraulic cylinder 103 contracts downwards, causing the upper mold 102 to move downwards, so that the upper mold 102 is engaged with the top of the lower mold 101, and the cavity of the two is closed. Then, the molten raw material is injected into the cavity through the injection pipe 7. As the raw material enters the cavity, the air in the cavity will be continuously discharged out through the vent hole 105. After the cavity is filled with raw material, wait for the raw material to cool and solidify in the cavity. After solidification, the hydraulic cylinder 103 extends, pushing the connecting plate 104 and the upper mold 102 upwards, so that the upper mold 102 separates from the lower mold 101. Then, the solidified resin craft is taken out, thus completing the injection molding.

[0035] During injection molding, air is slowly expelled from the cavity, such as... Figure 1 , 7 As shown in Figure 8, the upper mold 102 is provided with a detachable exhaust hood 2 at its top. An exhaust mesh 201 is embedded at the top of the exhaust hood 2. A movable plate 202 is provided inside the exhaust hood 2. A sealing ring is fixedly provided at the outer end of the movable plate 202 to contact the inner wall of the exhaust hood 2. A micro hole 203 is provided on the movable plate 202 to penetrate the movable plate 202. A buffer spring 204 is fixedly provided at the top of the movable plate 202. The top of the buffer spring 204 is fixedly connected to the inner wall of the exhaust hood 2. An exhaust hole 105 is provided inside the exhaust hood 2 and located below the movable plate 202.

[0036] During the injection molding process, air in the mold cavity is discharged outward through the vent 105 and enters the vent hood 2. The air entering the vent hood 2 pushes the moving plate 202 upward, causing the moving plate 202 to move upward. The buffer spring 204 is thus compressed. However, the air does not stay in the vent hood 2, but is discharged above the moving plate 202 through the micro-holes 203, and then finally discharged through the vent mesh 201. However, the micro-holes 203 are small in size and the venting speed is slow, so it takes a period of time to completely discharge the air. During this period, the area below the moving plate 202 is under high pressure. The pressure acts downward through the vent 105 on the raw material in the mold, keeping the raw material under high pressure for a period of time. The pressure can make the raw material more compact during the cooling process, and the final product will be more durable. As air continues to pass through the micro-holes 203, the air pressure below the moving plate 202 gradually decreases, and the elastic force of the buffer spring 204 pushes the moving plate 202 downward until it returns to its original position.

[0037] The molten raw material is driven to flow and be injected into the cavity between the lower mold 101 and the upper mold 102, such as Figure 3-5 As shown, the bottom plate 1 is provided with an injection cylinder 3 at the top. The side of the injection cylinder 3 away from the lower mold 101 is fitted with a sleeve 6 through a sealed bearing. The injection cylinder 3 is provided with a hollow extrusion plug 605 for extruding raw materials. The side of the hollow extrusion plug 605 facing the sleeve 6 is provided with a detachable sealing cover 607. Two guide rods 603 that penetrate the sleeve 6 are fixed on the sealing cover 607.

[0038] A gear ring 601 is fixedly provided at the outer end of the sleeve 6, and a linear motor 8 is fixedly provided at the top of the base plate 1. The linear motor 8 is located at the bottom of the gear ring 601. A plurality of actuating teeth 801 are fixedly provided at the top of the mover of the linear motor 8. The mover of the linear motor 8 meshes with the gear ring 601 through the actuating teeth 801, and the sleeve 6 is driven to rotate back and forth by the reciprocating motion of the linear motor 8.

[0039] A heating plate 606 is installed on the inner wall of the hollow extrusion plug 605. A return spring 608 is provided between the sealing cover 607 and the sleeve 6. The two ends of the return spring 608 are fixedly connected to the inner wall of the sleeve 6 and the sealing cover 607, respectively.

[0040] The sleeve 6 is provided with an iron end plate 604 on the side away from the injection cylinder 3. The ends of the two guide rods 603 away from the injection cylinder 3 are fixedly connected to the iron end plate 604. An electromagnet 602 is installed on the side of the sleeve 6 facing the iron end plate 604.

[0041] After the molten raw material flows into the injection cylinder 3, the electromagnet 602 is energized to generate magnetic force. Under the action of magnetic force, the iron end plate 604 approaches the electromagnet 602. The movement of the iron end plate 604 pushes the guide rod 603 to move. The guide rod 603 drives the hollow extrusion plug 605 and the sealing cover 607. The hollow extrusion plug 605 squeezes and pushes the raw material inside the injection cylinder 3 until the hollow extrusion plug 605 contacts the injection tube 7. During the movement of the hollow extrusion plug 605, the return spring 608 is stretched. After the electromagnet 602 is de-energized, the elastic force of the return spring 608 is released, pulling the hollow extrusion plug 605 back to its original position, so that the raw material inside the injection cylinder 3 is completely injected into the mold cavity through the injection tube 7.

[0042] After injection, the linear motor 8 is turned on. The mover of the linear motor 8 reciprocates and rotates the gear ring 601 back and forth under the action of the actuating gear 801, which in turn drives the sleeve 6 to rotate back and forth. The sleeve 6 drives the sealing cap 607 and the hollow extrusion plug 605 to rotate back and forth through the guide rod 603. In this way, the hollow extrusion plug 605 is kept in motion during the process of raw material cooling and solidification, which avoids the hollow extrusion plug 605 from being stuck and fixed due to the solidification of raw material, thus avoiding affecting the subsequent injection molding work and improving the efficiency of injection molding.

[0043] Meanwhile, if adhesion actually exists, the heating plate 606 inside the hollow extrusion plug 605 can be energized to briefly and temporarily heat the adhesion part of the hollow extrusion plug 605, soften the solidified raw material, and separate the hollow extrusion plug 605.

[0044] The injection molding cylinder 3 is provided with a support base 301 at the bottom end. The support base 301 is detachably provided on the top of the base plate 1 to support and fix the injection molding cylinder 3. The injection molding cylinder 3 is provided with a feeding hopper 4 at the top. The feeding hopper 4 is fixedly provided with a feeding pipe 401 with a valve at the bottom end. The bottom end of the feeding pipe 401 is fixedly connected to the injection molding cylinder 3 and communicates with the inside of the injection molding cylinder 3.

[0045] The molten raw material is quantitatively added into the feeding hopper 4 (the amount of raw material depends on the volume of the resin craft to be produced; the actual amount of raw material used is slightly more than the volume required for the resin craft, so as to leave a margin). The raw material added into the feeding hopper 4 flows down into the injection cylinder 3 through the feeding pipe 401. Then the valve on the feeding pipe 401 is closed, and the injection molding work can begin.

[0046] To shorten the contact time between the raw material and the hollow extrusion plug 605, such as Figure 3 , 4 As shown in Figure 6, an end cap 302 is fixedly provided at the end of the injection tube 7 away from the lower mold 101. The end cap 302 is detachably provided at the end of the injection cylinder 3 facing the lower mold 101. The injection tube 7 communicates with the inside of the injection cylinder 3.

[0047] The outer end of the injection pipe 7 is fitted with a cooling cylinder 5. Multiple heat sinks 701 are fixedly installed on the outer end of the injection pipe 7. The heat sinks 701 are located inside the cooling cylinder 5. Water supply pipes with valves are fixed on both sides of the cooling cylinder 5. The two water supply pipes are the inlet pipe and the outlet pipe, respectively.

[0048] After the raw material is injected into the mold, cooling water is injected into the cooling cylinder 5 through the water inlet pipe. The cooling water is then discharged through the water outlet pipe, keeping the water inside the cooling cylinder 5 at a low temperature. This allows the water inside the cooling cylinder 5 to cool the injection pipe 7 and the raw material inside. The heat sink 701 at the outer end of the injection pipe 7 increases the heat dissipation area and improves heat dissipation efficiency. This shortens the cooling time of the raw material inside the injection pipe 7, allowing it to solidify quickly. Once solidified, the raw material is held in the injection pipe 7, eliminating the need for the hollow extrusion plug 605 to seal the injection pipe. At point 7, the hollow extrusion plug 605 can be removed from the injection tube 7, shortening the contact time between the hollow extrusion plug 605 and the raw material, and avoiding prolonged sealing that would cause the hollow extrusion plug 605 to stick to the end cap 302. The injection tube 7 is not completely covered by the cooling cylinder 5. A part of the end of the injection tube 7 near the injection cylinder 3 is not covered by the cooling cylinder 5, so this part cools slower. When most of the raw material inside the injection tube 7 solidifies under the cooling effect of the cooling cylinder 5, this part has not yet solidified and has not stuck to the hollow extrusion plug 605, so it does not affect the removal of the hollow extrusion plug 605.

[0049] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A resin craft injection molding device, comprising a base plate (1), a lower mold (101) at the top of the base plate (1), an upper mold (102) at the top of the lower mold (101), and an injection pipe (7) at the joint between the lower mold (101) and the upper mold (102), characterized in that: The bottom plate (1) is provided with an injection cylinder (3) at the top, and the side of the injection cylinder (3) away from the lower mold (101) is fitted with a sleeve (6) through a sealed bearing. The injection cylinder (3) is provided with a hollow extrusion plug (605) for extruding raw materials. The hollow extrusion plug (605) is provided with a sealing cap (607) on the side facing the sleeve (6). Two guide rods (603) that penetrate the sleeve (6) are fixed on the sealing cap (607). The outer end of the sleeve (6) is fixedly provided with a toothed ring (601), the top end of the base plate (1) is fixedly provided with a linear motor (8), the top end of the mover of the linear motor (8) is fixedly provided with a plurality of actuating teeth (801), and the mover of the linear motor (8) meshes with the toothed ring (601) through the actuating teeth (801). A hydraulic cylinder (103) is fixedly provided at the top of the base plate (1), and a connecting plate (104) is fixedly provided at the top of the hydraulic cylinder (103). The connecting plate (104) is fixedly provided on the outer surface of the upper mold (102). An exhaust hole (105) is fixedly provided at the top of the upper mold (102). The bottom end of the exhaust hole (105) communicates with the internal cavity of the upper mold (102). The upper mold (102) is provided with an exhaust hood (2) at the top. An exhaust mesh (201) is embedded at the top of the exhaust hood (2). A movable plate (202) is provided inside the exhaust hood (2). A micro hole (203) is opened on the movable plate (202) to penetrate the movable plate (202). A buffer spring (204) is fixedly provided at the top of the movable plate (202). The top of the buffer spring (204) is fixedly connected to the inner wall of the exhaust hood (2).

2. The resin craft injection molding device according to claim 1, characterized in that: A heating plate (606) is installed on the inner wall of the hollow extrusion plug (605), and a return spring (608) is provided between the sealing cover (607) and the sleeve (6).

3. The resin craft injection molding device according to claim 2, characterized in that: The sleeve (6) is provided with an iron end plate (604) on the side away from the injection cylinder (3). The ends of the two guide rods (603) away from the injection cylinder (3) are fixedly connected to the iron end plate (604). An electromagnet (602) is installed on the side of the sleeve (6) facing the iron end plate (604).

4. The resin craft injection molding device according to claim 1, characterized in that: The bottom end of the injection cylinder (3) is provided with a support seat (301), the support seat (301) is located at the top of the base plate (1), the top of the injection cylinder (3) is provided with a feeding hopper (4), the bottom end of the feeding hopper (4) is fixedly provided with a feeding pipe (401) with a valve, and the bottom end of the feeding pipe (401) is fixedly connected to the injection cylinder (3).

5. The resin craft injection molding device according to claim 1, characterized in that: An end cap (302) is fixedly provided at one end of the injection tube (7) away from the lower mold (101). The end cap (302) is located at one end of the injection cylinder (3) facing the lower mold (101).

6. The resin craft injection molding device according to claim 5, characterized in that: The injection pipe (7) is fitted with a cooling cylinder (5) at its outer end. Multiple heat sinks (701) are fixedly provided at the outer end of the injection pipe (7). Water pipes with valves are fixedly provided on both sides of the cooling cylinder (5).

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