Injection mechanism and vertical injection molding machine

Abstract

The application relates to an injection mechanism and a vertical injection molding machine, which comprises an injection plate, an injection cavity, an injection rod and an injection driving source. The injection driving source drives the injection rod to extrude material in the injection cavity, and the material is extruded into a fluid and flows out. A groove is arranged at the output end of the injection driving source, one end of the injection rod is inserted into the groove, an annular movable space is formed between the outer periphery of the injection rod and the inner wall of the groove, the output end of the injection driving source is connected with an adapter plate, a through hole is formed in the adapter plate and used for allowing the injection rod to pass through, a plunger flange connected with the adapter plate is arranged on the outer periphery of the injection rod, a plurality of plunger holes are formed in the plunger flange around the injection rod, and elastic ball head plungers are embedded in each plunger hole. The plurality of elastic ball head plungers jointly clamp the injection rod, so that the injection rod can elastically move and reset in the movable space. The application adopts a stamping feeding mode, the injection rod is floatingly arranged to ensure the accuracy and stability of stamping and the precision during material pressing.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and in particular to an injection mechanism and a vertical injection molding machine. Background Technology

[0002] Injection molding refers to a method where molten material is injected into a mold cavity under high pressure, and then cooled and solidified to obtain a molded product. The basic principle is to utilize the extrudability and plasticity of plastics, injecting molten plastic into a mold under pressure, and then cooling to form the desired plastic part. This method is suitable for the mass production of complex-shaped parts and is one of the important processing methods for injection-molded plastic products. The injection molding process can be roughly divided into the following seven stages: feeding and molten plasticizing, mold closing, mold locking, injection, pressure holding, cooling, and mold opening. Currently, injection molding machines on the market are generally divided into vertical injection molding machines and horizontal injection molding machines according to the injection method and mold locking method. Vertical injection molding machines are widely used by users due to their advantages such as small footprint, convenient feeding, easy molding, high stability, and simple structure. Therefore, many types of vertical injection molding machines have been invented.

[0003] Most existing vertical injection molding machines use a screw-driven material feeding mechanism. For example, Chinese patent CN110103388A, entitled "A Standard Vertical Injection Molding Machine with Three Ejector Pins for Connectors," discloses a standard vertical injection molding machine that uses a screw drive for extrusion feeding. However, the screw drive has a complex structure and high component costs. Furthermore, in actual use, the screw drive requires preheating, resulting in low feeding efficiency. After use, the screw also needs to be cleaned, further affecting its efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the injection mechanism in the prior art is complex and unsuitable, and to provide an injection mechanism and a vertical injection molding machine, which adopts a stamping feeding method to stamp the material cake into a fluid for the injection molding machine. In addition, in order to ensure the accuracy and stability of stamping, the injection head is floating to ensure the precision of the material pressing.

[0005] To solve the above-mentioned technical problems, the present invention provides an injection mechanism, comprising:

[0006] Injection plate;

[0007] An injection cavity, embedded in the injection plate, has a receiving cavity, a guide port and an injection port communicating with the receiving cavity;

[0008] An injection rod is disposed on one side of the injection cavity corresponding to the guide port, and the injection rod can be inserted into the receiving cavity from the guide port;

[0009] An injection drive source is connected to the injection rod. The injection drive source drives the injection rod to enter and exit the receiving cavity and squeezes the material placed in the receiving cavity, squeezing the material into a fluid that flows out from the injection port.

[0010] Wherein: a groove is provided at the output end of the injection drive source, one end of the injection rod is inserted into the groove, and an annular movable space is formed between the outer periphery of the injection rod and the inner wall of the groove. The output end of the injection drive source is connected to an adapter plate, and a through hole is provided on the adapter plate for the injection rod to pass through. A plunger flange connected to the adapter plate is fitted around the outer periphery of the injection rod. A plurality of plunger holes are provided in the plunger flange around the injection rod, and an elastic ball plunger is embedded in each plunger hole. The plurality of elastic ball plungers together clamp the injection rod, so that the injection rod can move elastically within the movable space.

[0011] In one embodiment of the present invention, the injection driving source is fixed on the mounting plate, a plurality of guide rods are provided between the mounting plate and the injection plate, and a guide hole is provided on the adapter plate for the guide rods to pass through. The adapter plate is slidably sleeved on the plurality of guide rods.

[0012] In one embodiment of the present invention, an electronic ruler is further included, one end of which is fixed to the mounting plate and the other end of which is connected to the adapter plate. The electronic ruler is used to detect the movement distance of the adapter plate relative to the mounting plate.

[0013] In one embodiment of the present invention, the injection rod includes:

[0014] One end of the rod is inserted into the groove of the injection drive source;

[0015] The firing head is detachably mounted at the end of the rod and can be inserted into the receiving cavity;

[0016] A heating element is disposed in the rod body to heat the rod body.

[0017] In one embodiment of the present invention, a thermocouple is also connected to the injection rod.

[0018] To address the aforementioned technical problems, the present invention also provides a vertical injection molding machine, including the aforementioned injection mechanism and a clamping mechanism, wherein: the injection plate serves as the upper template of the clamping mechanism, and the clamping mechanism further includes:

[0019] The lower template is configured correspondingly to the injection plate, forming a mold-locking space between the injection plate and the lower template;

[0020] The mold-locking drive source drives the injection plate and the lower mold plate to move in opposite directions or in the opposite direction to complete the mold-locking and mold-opening actions.

[0021] In one embodiment of the present invention, the mold-locking mechanism further includes:

[0022] The support frame, the lower template is fixed on the support frame, the output end of the mold clamping drive source is connected to the injection plate, and the mold clamping drive source drives the injection plate to move towards or away from the lower template;

[0023] Guide pillars, multiple guide pillars are slidably inserted in the lower template, one end of each guide pillar is connected to the mold-locking drive source, and the other end of each guide pillar is connected to the upper template.

[0024] In one embodiment of the present invention, a heating device and a material detection device are provided on the lower template.

[0025] In one embodiment of the present invention, it further includes: an oil tank and an injection power source and a mold clamping power source disposed on the oil tank.

[0026] In one embodiment of the present invention, a cleaning mechanism is further included, the cleaning mechanism being disposed on one side of the molding space, the cleaning mechanism comprising:

[0027] A transfer stage, which is movable within the mold-locking space;

[0028] Two sets of electric cleaning rollers are mounted on the transfer platform and can move with the transfer platform. The two sets of electric cleaning rollers can respectively perform roller cleaning on the injection plate and the lower template.

[0029] The technical solution of the present invention has the following advantages compared with the prior art:

[0030] The injection mechanism of the present invention changes the screw extrusion feeding method of the existing injection mechanism and adopts a stamping feeding method in which the injection rod and the injection cavity cooperate. The injection rod enters the receiving cavity from the guide port and stamps the material in the receiving cavity, extruding the material into a fluid that flows out from the injection port. Compared with the screw extrusion feeding method of the prior art, this feeding method has a simpler structure, is easier to maintain, and can improve the feeding efficiency.

[0031] In practical use, because the material is distributed in different positions within the accommodating cavity, if a fixed injection rod is used to press at a fixed position, incomplete material pressing will occur, resulting in material waste. Therefore, this invention uses a floating injection rod with a groove at the output end of the injection drive source. One end of the injection rod is inserted into the groove, and the diameter of the groove is larger than the diameter of the injection rod. This creates an annular moving space between the outer circumference of the injection rod and the inner wall of the groove. After the injection rod is inserted into the injection cavity, it can move horizontally in this space under the pressure of the material, ensuring proper material pressing. The accuracy is ensured by fully compressing the material placed in the injection cavity. Simultaneously, to guarantee accurate insertion of the floating injection rod from the guide port, a plunger flange is fitted around the injection rod. Several plunger holes are formed within the plunger flange around the injection rod, and an elastic ball-head plunger is embedded in each plunger hole. When the injection rod is pulled out from the guide port, the multiple elastic ball-head plungers clamp the injection rod, allowing it to move elastically within the movable space and reset when no force is applied. This ensures that the injection rod can accurately insert into the injection cavity from the guide port during each stamping process.

[0032] The vertical injection molding machine of the present invention incorporates the above-mentioned injection mechanism. The injection plate serves as the upper template of the mold-locking mechanism. The injection mechanism, in conjunction with the mold-locking mechanism, completes the actions of mold closing, mold locking, injection, pressure holding, cooling, and mold opening. Attached Figure Description

[0033] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0034] Figure 1 This is a schematic diagram of the overall structure of the injection mechanism of the present invention;

[0035] Figure 2 This is a schematic diagram of the connection between the injection rod and the injection drive source of the present invention;

[0036] Figure 3 This is an exploded structural diagram of the connection between the injection rod and the injection drive source of the present invention;

[0037] Figure 4 This is a schematic diagram of the overall structure of the vertical injection molding machine of the present invention;

[0038] Figure 5 This is a schematic diagram of the mold-locking mechanism of the present invention;

[0039] Figure 6 This is a schematic diagram of the cleaning structure of the present invention.

[0040] Explanation of reference numerals in the accompanying drawings: 1. Injection mechanism; 11. Injection plate; 12. Injection cavity; 121. Guide port; 13. Injection rod; 131. Rod body; 132. Injection head; 133. Heating core; 14. Injection drive source; 141. Groove; 15. Adapter plate; 16. Plunger flange; 161. Elastic ball plunger; 17. Thermocouple; 18. Guide rod; 19. Electronic ruler; 2. Mold clamping mechanism; 21. Lower mold plate; 22. Mold clamping drive source; 23. Guide column; 24. Product inspection device; 25. Heating device; 3. Oil tank; 31. Injection power source; 32. Mold clamping power source; 4. Cleaning mechanism; 41. Transfer table; 42. Electric cleaning roller. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0042] Example 1

[0043] Reference Figure 1 As shown, the injection mechanism of the present invention includes: an injection plate 11, an injection cavity 12, an injection rod 13, and an injection drive source 14, wherein: the injection cavity 12 is embedded in the injection plate 11, and the injection cavity 12 has a receiving cavity, a guide port 121 communicating with the receiving cavity, and an injection port. In this embodiment, the material is prepared into a cake shape and placed in the receiving cavity, and the injection rod 13 is positioned on one side of the injection cavity 12 corresponding to the guide port 121, so that the injection rod 13 can be inserted into the receiving cavity from the guide port 121. In the aforementioned accommodating cavity, the injection drive source 14 is connected to the injection rod 13. The injection drive source 14 drives the injection rod 13 in and out of the accommodating cavity and squeezes the material placed in the accommodating cavity, squeezing the material into a fluid that flows out from the injection port. The stamping feeding method using the injection rod 13 and the injection cavity 12 is simpler in structure and easier to maintain than the screw extrusion feeding method of the prior art. It does not require preheating and can improve the feeding efficiency. In addition, it is also convenient to clean the injection cavity 12 after use.

[0044] In practical use, because the material is distributed in different positions within the accommodating cavity, if a fixed injection rod 13 is used to press at a fixed position, incomplete material pressing will occur, resulting in material waste. To solve this problem, refer to... Figure 2 and Figure 3As shown, the present invention employs a floating injection rod 13. A groove 141 is provided at the output end of the injection drive source 14. One end of the injection rod 13 is inserted into the groove 141. The diameter of the groove 141 is set to be larger than the diameter of the injection rod 13. In this way, an annular movable space is formed between the outer periphery of the injection rod 13 and the inner wall of the groove 141. After the injection rod 13 is inserted into the injection cavity 12, it can move in the horizontal direction of the space under the extrusion of the material, ensuring the accuracy of the material pressing and fully extruding the material placed in the injection cavity 12.

[0045] Meanwhile, to ensure that the floating injection rod 13 can be accurately inserted from the guide port 121, an adapter plate 15 is connected to the output end of the injection drive source 14. The adapter plate 15 has a through hole for the injection rod 13 to pass through. A plunger flange 16 connected to the adapter plate 15 is fitted around the injection rod 13. Several plunger holes are opened in the plunger flange 16 around the injection rod 13. An elastic ball plunger 161 is embedded in each plunger hole. When the injection rod 13 is pulled out from the guide port 121, the multiple elastic ball plungers 161 clamp the injection rod 13 together, so that the injection rod 13 can move elastically within the active space and reset when no force is applied, ensuring that the injection rod 13 can be accurately inserted into the injection cavity 12 from the guide port 121 during each stamping process.

[0046] Reference Figure 1 As shown, in this embodiment, the injection drive source 14 is fixed on the mounting plate, and a plurality of guide rods 18 are provided between the mounting plate and the injection plate 11. A guide hole is provided on the adapter plate 15 for the guide rods 18 to pass through. The adapter plate 15 is slidably sleeved on the plurality of guide rods 18. When the injection drive source 14 pushes the adapter plate 15 to move, the adapter plate 15 is supported and limited by the plurality of guide rods 18, ensuring that the adapter plate 15 can only maintain a horizontal posture and move parallel to the vertical direction after being subjected to force. This can limit the movement direction of the injection rod 13 and ensure that the injection rod 13 can be accurately inserted into the injection cavity 12 from the guide port 121.

[0047] In this embodiment, an electronic ruler 19 is also provided. One end of the electronic ruler 19 is fixed on the mounting plate, and the other end of the electronic ruler 19 is connected to the adapter plate 15. The electronic ruler 19 is used to detect the moving distance of the adapter plate 15 relative to the mounting plate, thereby detecting the moving distance of the injection rod 13. In fact, the length of the injection rod 13 inserted into the injection cavity 12 can be obtained. By setting the threshold of the electronic ruler 19, the moving position of the injection rod 13 can be limited.

[0048] Specifically, in actual use, materials are more easily compressed and melted into a fluid when heated. Therefore, in this embodiment, referring to... Figure 2 and Figure 3 As shown, the injection rod 13 includes a rod body 131, an injection head 132, and a heating core 133. One end of the rod body 131 is inserted into the groove 141 of the injection drive source 14, and the other end is detachably connected to the injection head 132. The injection head 132 can be inserted into the receiving cavity. The heating core 133 is disposed in the rod body 131 to heat the rod body 131 and may transfer the heat to the injection head 132, thereby heating and pressing the material. This allows the material to be pressed in a high-temperature environment, making it easier to form a fluid.

[0049] Specifically, a thermocouple 17 is also connected to the injection rod 13, which can monitor the temperature of the injection rod 13 in real time and feed it back to the heating core 133. The heating core 133 adjusts in real time according to the detected temperature.

[0050] Example 2

[0051] Reference Figure 4 As shown, the present invention also discloses a vertical injection molding machine, characterized in that: it includes the injection mechanism 1 described in the above embodiment 1, and further includes a mold clamping mechanism 2, wherein the injection plate 11 in the above injection mechanism 1 is used as the upper template of the mold clamping mechanism 2 in this embodiment, and the mold clamping mechanism 2 further includes: a lower template 21 and a mold clamping drive source 22, wherein: the lower template 21 is correspondingly arranged with the injection plate 11, and a mold clamping space is formed between the injection plate 11 and the lower template 21, and the mold clamping drive source 22 drives the injection plate 11 and the lower template 21 to move towards or in opposite directions to complete the mold clamping and mold opening actions;

[0052] The vertical injection molding machine of the present invention first places the material to be injected into the clamping mechanism 2. The clamping drive source 22 drives the injection plate 11 and the lower template 21 to move towards each other, completing the mold closing and clamping action, and realizing the clamping and fixing of the material. Then, the injection drive source in the injection mechanism 1 drives the injection rod 13 to be inserted into the injection cavity 12, and the material is squeezed in the injection cavity 12, and the material is squeezed into a fluid and flows out from the injection port to realize the injection action of the material to be injected. After the injection is completed, the clamping mechanism 2 continues to maintain the pressure action, waiting for the injected plastic to cool and solidify. Finally, the clamping drive source 22 drives the injection plate 11 and the lower template 21 to move in opposite directions to realize the mold opening action, thereby completing the entire injection molding action.

[0053] Reference Figure 5As shown, the clamping mechanism 2 further includes a support frame. In this embodiment, the lower template 21 is fixed on the support frame, and the output end of the clamping drive source 22 is connected to the injection plate 11. The clamping drive source 22 drives the injection plate 11 to move closer to or further away from the lower template 21. In other embodiments, the injection plate 11 can also be fixed, and the output end of the clamping drive source 22 can be connected to the lower template 21. The clamping drive source 22 drives the lower template 21 to move closer to or further away from the injection plate 11.

[0054] Specifically, in this embodiment, to enhance the stability of the mold-locking mechanism between the injection plate 11 and the lower mold plate 21, multiple guide posts 23 are provided between the injection plate 11 and the lower mold plate 21. The guide posts 23 slide through the lower mold plate 21, with one end connected to the mold-locking drive source 22 and the other end connected to the injection plate 11. The mold-locking drive source 22 transmits power to the injection plate 11 through the guide posts 23. The guide posts 23 limit the direction of movement of the injection plate 11, thereby ensuring the direction of the force applied during mold-locking and also ensuring the stability of the applied force.

[0055] Specifically, a product detection device 24 is also provided on the lower template 21. The product detection device 24 is a through-beam photoelectric sensor. The mold locking mechanism 2 can only perform the mold locking action when the product detection device 24 detects the material, which can improve the safety of the mold locking mechanism 2 and prevent the occurrence of accidental mold locking.

[0056] Specifically, in this embodiment, when injecting the part into the mold, a certain temperature needs to be maintained in order to ensure the fluidity of the injection molding material. Therefore, a heating device 25 is provided in the lower mold 21.

[0057] Specifically, in this embodiment, both the injection drive source 14 and the mold clamping drive source 22 are hydraulic drive sources, i.e., oil cylinder drive sources. In this embodiment, an oil tank 3 is also provided to supply oil to the injection drive source 14 and the mold clamping drive source 22. The injection power source 31 and the mold clamping power source 32 on the oil tank 3 supply oil to the injection drive source 14 and the mold clamping drive source 22, respectively.

[0058] Reference Figure 6 As shown, after injection molding is completed, there may be injection molding residue. Therefore, in this example, a cleaning mechanism 4 is also provided. The cleaning mechanism 4 is located on one side of the mold clamping space. The cleaning mechanism 4 includes a transfer table 41 and two sets of electric cleaning rollers 42. The transfer table 41 can drive the electric cleaning rollers 42 to move in the mold clamping space. The two sets of electric cleaning rollers 42 can respectively perform roller cleaning on the injection plate 11 and the lower mold plate 21.

[0059] Specifically, the cleaning mechanism 4 also includes an air blowing assembly, which is configured to blow injection molding residue off the lower template 21.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An injection mechanism, characterized in that, include: Injection plate; An injection cavity, embedded in the injection plate, has a receiving cavity, a guide port and an injection port communicating with the receiving cavity; An injection rod is disposed on one side of the injection cavity corresponding to the guide port, and the injection rod can be inserted into the receiving cavity from the guide port; An injection drive source is connected to the injection rod. The injection drive source drives the injection rod to enter and exit the receiving cavity and squeezes the material placed in the receiving cavity, squeezing the material into a fluid that flows out from the injection port. Wherein: a groove is provided at the output end of the injection drive source, one end of the injection rod is inserted into the groove, and an annular movable space is formed between the outer periphery of the injection rod and the inner wall of the groove. The output end of the injection drive source is connected to an adapter plate, and a through hole is provided on the adapter plate for the injection rod to pass through. A plunger flange connected to the adapter plate is fitted around the outer periphery of the injection rod. A plurality of plunger holes are provided in the plunger flange around the injection rod, and an elastic ball plunger is embedded in each plunger hole. The plurality of elastic ball plungers together clamp the injection rod, so that the injection rod can move elastically and return to its original position within the movable space. The injection rod includes: a rod body, one end of which is inserted into the groove of the injection drive source; a nozzle, detachably disposed at the end of the rod body, the nozzle being able to be inserted into the receiving cavity; a heating core, disposed in the rod body, for heating the rod body; and a thermocouple is also connected to the injection rod. The injection drive source is fixed on the mounting plate, and a plurality of guide rods are provided between the mounting plate and the injection plate. A guide hole is provided on the adapter plate for the guide rods to pass through, and the adapter plate is slidably sleeved on the plurality of guide rods. It also includes an electronic ruler, one end of which is fixed to the mounting plate and the other end of which is connected to the adapter plate. The electronic ruler is used to detect the movement distance of the adapter plate relative to the mounting plate.

2. A vertical injection molding machine, characterized in that: The injection mechanism of claim 1 further includes a mold-locking mechanism, wherein: the injection plate serves as the upper template of the mold-locking mechanism, and the mold-locking mechanism further includes: The lower template is configured correspondingly to the injection plate, forming a mold-locking space between the injection plate and the lower template; The mold-locking drive source drives the injection plate and the lower mold plate to move in opposite directions or in the opposite direction to complete the mold-locking and mold-opening actions.

3. The vertical injection molding machine according to claim 2, characterized in that: The mold-locking mechanism further includes: The support frame, the lower template is fixed on the support frame, the output end of the mold clamping drive source is connected to the injection plate, and the mold clamping drive source drives the injection plate to move towards or away from the lower template; Guide pillars, multiple guide pillars are slidably inserted in the lower template, one end of each guide pillar is connected to the mold-locking drive source, and the other end of each guide pillar is connected to the upper template.

4. The vertical injection molding machine according to claim 2, characterized in that: The lower template is equipped with a heating device and a material detection device.

5. The vertical injection molding machine according to claim 2, characterized in that: Also includes: The oil tank and the injection power source and mold clamping power source mounted on the oil tank.

6. The vertical injection molding machine according to claim 2, characterized in that: Also includes: A cleaning mechanism, disposed on one side of the molding space, comprising: A transfer stage, which is movable within the mold-locking space; Two sets of electric cleaning rollers are mounted on the transfer platform and can move with the transfer platform. The two sets of electric cleaning rollers can respectively perform roller cleaning on the injection plate and the lower template.

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