Injection molding ejection mold of coffee machine plastic part

Abstract

The utility model relates to an injection mold, in particular to an injection ejection mold for a plastic part of a coffee machine. Comprising a base, two supporting plates are symmetrically and fixedly arranged on the upper side wall of the base, a lower mold is fixedly arranged on the upper side walls of the two supporting plates, a forming cavity is formed in the upper side wall of the lower mold, and a moving plate is arranged between the two supporting plates. According to the utility model, the turntable is rotated to drive the corresponding locking blocks to horizontally move through the connecting rods, so that after the end parts of the locking blocks are moved out from the interiors of the corresponding locking sleeves, the locking of the locking mechanism on the four limiting sleeves can be simultaneously released, and then a worker takes down the limiting sleeves and the reset springs from the sliding rods in sequence; and then the sliding rod is sleeved with a new reset spring from top to bottom, it is ensured that the lower end of the new reset spring falls to the surface of the movable plate through the circular groove, finally, the limiting sleeve is installed in the installation groove again, replacement of the reset spring can be completed on the premise that the die is not disassembled, and the difficulty of workers for replacing the reset spring is reduced.

Description

An injection ejector mold for a plastic part of a coffee machine Technical Field

[0001] This utility model relates to an injection mold, specifically, to an injection ejector mold for a plastic part of a coffee machine. Background Technology

[0002] Injection molds are widely used in the industrial field. For example, solid rod-shaped plastic support parts inside coffee machines are generally processed and produced using injection molds. During the injection molding process, after the injection molded part cools and solidifies, it needs to be ejected from the molding cavity of the injection mold by an ejection mechanism to facilitate demolding.

[0003] In the existing ejection mechanism design of injection molds, the movable plate is vertically installed on the lower mold base as a key component, and several ejector rods are vertically fixed on its upper side wall. These ejector rods slide through the lower mold body and extend into the molding cavity, forming the actuator of the ejection system. During demolding, the external hydraulic drive unit pushes the movable plate vertically upward through a non-fixed piston rod, thereby driving the ejector rods to eject the injection molded part from the molding cavity to complete the demolding. It is worth noting that the hydraulic actuator and the movable plate adopt a non-rigid connection design. Although this structural feature facilitates the maintenance and repair of the hydraulic system, it also results in the ejection system lacking an automatic reset function.

[0004] To solve the reset problem, existing mold structures are equipped with elastic reset springs. These springs provide the necessary rebound force after the ejector rod pushes the injection part out of the molding cavity, allowing the moving plate and ejector rod to return to their initial positions. However, due to the fatigue characteristics of the material, the spring element will experience elastic decay after cyclic compression, requiring preventative replacement to ensure the reset accuracy of the moving plate and ejector rod. The drawback of the existing structure is that the spring replacement process is cumbersome, requiring workers to simultaneously disassemble the ejector rod assembly and the mold plate fixing structure, resulting in significant disadvantages such as high operational complexity and low maintenance efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an injection ejector mold for plastic parts in coffee machines, so as to solve the problems mentioned in the background art.

[0006] The process of replacing springs in injection molds is cumbersome. Workers need to simultaneously disassemble the ejector pin assembly and the template fixing structure, which has significant drawbacks such as high operational complexity and low maintenance efficiency.

[0007] To address the aforementioned problems, the present invention aims to provide an injection ejector mold for a coffee machine plastic part, comprising a base, two support plates symmetrically fixedly mounted on the upper sidewall of the base, a lower mold fixedly mounted on the upper sidewall of the two support plates, a molding cavity formed in the upper sidewall of the lower mold, a movable plate disposed between the two support plates, and a plurality of ejector rods vertically fixed on the upper sidewall of the movable plate, the upper ends of the ejector rods slidingly penetrating the lower mold and extending into the molding cavity, and four mounting slots symmetrically formed on both sides of the upper sidewall of the lower mold. The bottom of the mounting slot has a circular groove that passes through the lower mold. A sliding rod is vertically fixed on the side wall of the moving plate at a position corresponding to each circular groove. The upper end of the sliding rod passes through the corresponding circular groove and extends into the mounting slot. A limiting sleeve is slidably sleeved on the sliding rod inside the mounting slot. A return spring is sleeved on the sliding rod between the limiting sleeve and the moving plate. The upper end of the return spring is located inside the circular groove, and the return spring pushes the moving plate away from the lower mold. A locking mechanism is provided on the lower mold to fix the limiting sleeve in the corresponding mounting slot.

[0008] As a further improvement to this technical solution, a locking sleeve is horizontally fixed on the side of the limiting sleeve away from the center of the lower mold. The locking mechanism includes a rotating shaft that horizontally penetrates the lower mold and rotates with it. The two ends of the rotating shaft extend to both sides of the lower mold and are provided with fixing components. The fixing components are located in the area between the two locking sleeves.

[0009] As a further improvement to this technical solution, the fixing component includes a turntable coaxially fixed on a rotating shaft. Two inclined connecting rods are centrally hinged symmetrically on the circumferential sidewall of the turntable. The other end of the connecting rod is hinged to a locking block corresponding to the locking sleeve. A guide sleeve horizontally fixed on the lower mold is slidably sleeved on the locking block. When the locking block moves away from the turntable along the guide sleeve, the end of the locking block is inserted into the corresponding locking sleeve.

[0010] As a further improvement to this technical solution, positioning grooves are provided on the side walls corresponding to the lower mold and the fixing component. The fixing component also includes a perforated plate fixed to the circumferential side wall of the turntable. A pin is horizontally slidably arranged inside the perforated plate. When the end of the locking block is inserted into the inside of the locking sleeve, the axis of the pin is on the same straight line as the axis of the positioning groove. When the end of the pin is inserted into the inside of the positioning groove, the pin restricts the turntable from rotating around the axis of rotation.

[0011] As a further improvement to this technical solution, two vertically arranged fitting grooves are symmetrically opened on the inner wall of the mounting groove. Fitting blocks are vertically fixed on both sides of the limiting sleeve at positions corresponding to the fitting grooves. The fitting blocks are slidably arranged in the corresponding fitting grooves. The fitting blocks and fitting grooves cooperate to restrict the horizontal movement of the limiting sleeve in the mounting groove.

[0012] As a further improvement to this technical solution, a through groove is provided in the middle of the lower side wall of the base, and guide posts are provided on both sides of the through groove and vertically fixed to the upper side wall of the base. The upper end of the guide post slides through the moving plate and contacts the lower side wall of the lower mold. The guide post guides the moving plate on the one hand and supports the lower mold on the other.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The injection ejector mold for the plastic parts of this coffee machine allows the corresponding locking blocks to move horizontally via a rotating turntable and connecting rod. After the end of the locking block moves out of the corresponding locking sleeve, the locking mechanism can simultaneously release the four limit sleeves. Then, the worker removes the limit sleeves and return springs from the slide rod. Next, the new return spring is inserted into the slide rod from top to bottom, ensuring that the lower end of the new return spring falls into the moving plate surface through the circular groove. Finally, the limit sleeves are reinstalled into the mounting slot. This allows the return spring to be replaced without disassembling the mold, reducing the difficulty for workers to replace the return spring. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 is one of the cross-sectional views of this utility model;

[0017] Figure 3 is a second sectional view of this utility model;

[0018] Figure 4 is one of the partial structural schematic diagrams of this utility model;

[0019] Figure 5 is an exploded view of this utility model;

[0020] Figure 6 is an enlarged view of the structure at point A in Figure 5 of this utility model;

[0021] Figure 7 is a second partial structural schematic diagram of this utility model;

[0022] Figure 8 is a structural schematic diagram of the locking mechanism of this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Base; 11. Through groove; 12. Guide post;

[0025] 2. Support plate;

[0026] 3. Lower mold; 31. Molding cavity; 32. Mounting groove; 321. Fitting groove; 322. Circular groove; 33. Positioning groove; 34. Guide sleeve;

[0027] 4. Moving plate; 41. Sliding rod; 42. Push rod;

[0028] 5. Limiting sleeve; 51. Locking sleeve; 52. Fitting block;

[0029] 6. Return spring;

[0030] 7. Locking mechanism; 71. Rotating shaft; 72. Turntable; 73. Connecting rod; 74. Locking block; 75. Hole plate; 76. Pin. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] Please refer to Figure 1. The purpose of this embodiment is to provide an injection ejection mold for a coffee machine plastic part, including a base 1. Two support plates 2 are symmetrically fixed on the upper side wall of the base 1. A lower mold 3 is fixed on the upper side wall of the two support plates 2. A molding cavity 31 is opened on the upper side wall of the lower mold 3. The shape of the molding cavity 31 matches the shape of the rod-shaped support part of the coffee machine. When this mold is used in conjunction with an upper mold with a sprue, after the upper mold and the lower mold 3 are closed, the sprue and the interior of the molding cavity 31 form a connected injection channel. At this time, molten plastic is injected into the molding cavity 31 through the sprue. After the material cools and solidifies, the desired rod-shaped support part of the coffee machine is finally formed in the molding cavity 31.

[0034] To facilitate the removal of the coffee machine plastic parts from the molding cavity 31, referring to Figure 4, a movable plate 4 is provided between the two support plates 2. Several ejector rods 42 are vertically fixed on the upper side wall of the movable plate 4. The upper ends of the ejector rods 42 slide through the lower mold 3 and extend into the molding cavity 31. During the injection molding process, the upper ends of the ejector rods 42 and the bottom surface of the molding cavity 31 form a continuous surface, so that the ejector rods 42 and the molding cavity 31 combine to form a complete arc surface, effectively preventing the plastic melt from flowing inside the molding cavity 31. Structural defects may occur during movement, ensuring the geometric accuracy of the product. Referring to Figure 2, a through groove 11 is provided in the middle of the lower side wall of the base 1. Guide pins 12 are vertically fixed to the upper side wall of the base 1 on both sides of the through groove 11. The upper end of the guide pin 12 slides through the moving plate 4 and contacts the lower side wall of the lower mold 3. On the one hand, the top of the guide pin 12 contacts the bottom surface of the lower mold 3 to form a support and positioning. On the other hand, it constrains the movement trajectory of the moving plate 4 through sliding cooperation, ensuring that the moving plate 4 can only move in a straight line in the vertical direction.

[0035] When using this mold, a hydraulic cylinder is installed on the lower side wall of the base 1. When it is necessary to remove the plastic part of the coffee machine from the inside of the molding cavity 31, the hydraulic cylinder drives the piston rod to extend, so that the piston rod passes through the through groove 11 and contacts the lower side wall of the moving plate 4. Then the piston rod pushes the moving plate 4 to move upward along the guide post 12. The moving plate 4 drives the ejector rod 42 to move upward synchronously. The upward-moving ejector rod 42 pushes the plastic part of the coffee machine out of the inside of the molding cavity 31, completing the demolding work of the rod-shaped support part of the coffee machine.

[0036] Referring to Figures 3 and 5, four mounting slots 32 are symmetrically provided on both sides of the upper sidewall of the lower mold 3. A circular groove 322 penetrating the lower mold 3 is provided at the bottom of each mounting slot 32. The size of the circular groove 322 is smaller than the size of the mounting slot 32. A sliding rod 41 is vertically fixed at a position corresponding to each circular groove 322 on the upper sidewall of the movable plate 4. The upper end of the sliding rod 41 passes through the corresponding circular groove 322 and extends into the interior of the mounting slot 32. A gap exists between the circumferential sidewall of the sliding rod 41 and the circumferential inner wall of the circular groove 322. A limiting device is provided inside the mounting slot 32, which is slidably fitted onto the sliding rod 41. The limiting sleeve 5 restricts the slide rod 41, allowing it to move only in the vertical direction. A return spring 6 is sleeved on the slide rod 41 between the limiting sleeve 5 and the moving plate 4. The inner diameter of the circular groove 322 is larger than the diameter of the return spring 6. The upper end of the return spring 6 is located inside the circular groove 322, that is, the upper end of the return spring 6 is located in the gap between the slide rod 41 and the circular groove 322. The return spring 6 pushes the moving plate 4 away from the lower mold 3. A locking mechanism 7 is provided on the lower mold 3 to fix the limiting sleeve 5 in the corresponding mounting groove 32.

[0037] During the demolding process, the piston rod of the hydraulic cylinder pushes the moving plate 4 upward, and the moving plate 4 drives the sliding rod 41 to move along the corresponding limiting sleeve 5. The distance between the moving plate 4 and the limiting sleeve 5 shortens, and the return spring 6 is compressed and contracts. After the ejector rod 42 ejects the coffee machine plastic part from the inside of the molding cavity 31, the hydraulic cylinder drives the piston rod to retract, and the return spring 6 rebounds. The rebounding return spring 6 pushes the moving plate 4 and the ejector rod 42 downward to reset, so that the upper end of the ejector rod 42 and the bottom surface of the molding cavity 31 form a continuous surface, so that the ejector rod 42 can perform the next demolding operation of the coffee machine support part.

[0038] When the return spring 6 reaches the end of its service life and needs to be replaced, the operation procedure is as follows: First, release the locking mechanism 7 from fixing the limit sleeve 5, and remove the limit sleeve 5 vertically along the axis of the slide rod 41; then, pull the old return spring 6 axially along the slide rod 41 so that the old return spring 6 passes through the circular groove 322, thereby separating the old return spring 6 from the slide rod 41; when installing the new return spring 6, put the new return spring 6 into the slide rod 41 from top to bottom, ensuring that the lower end of the new return spring 6 falls into the surface of the moving plate 4 through the circular groove 322; finally, reinstall the limit sleeve 5 into the mounting groove 32, and fix the limit sleeve 5 through the locking mechanism 7. The whole process does not require disassembling the core components of the mold such as the base 1, support plate 2, and lower mold 3, reducing the workload of workers.

[0039] A locking sleeve 51 is horizontally fixed on the side of the limiting sleeve 5 away from the center of the lower mold 3. The structure of the locking mechanism 7 is detailed below. Referring to Figures 6-8, the locking mechanism 7 includes a rotating shaft 71 that horizontally passes through the lower mold 3 and rotates with it. The two ends of the rotating shaft 71 extend to the two sides of the lower mold 3 and are provided with fixing components. The fixing components are located in the area between the two locking sleeves 51. A knob for easy operation is coaxially fixed at both ends of the rotating shaft 71. The rotating shaft 71 can be rotated by rotating the knob. The fixing components include a turntable 72 coaxially fixed on the rotating shaft 71. Two inclined connecting rods 73 are centrally hinged symmetrically on the circumferential side wall of the turntable 72. The other end of the connecting rod 73 is hinged to a locking block 74 corresponding to the locking sleeve 51. A guide sleeve 34 that is horizontally fixed on the lower mold 3 is slidably sleeved on the locking block 74. The guide sleeve 34 restricts the locking block 74 to move only horizontally.

[0040] When the worker rotates the shaft 71, causing the turntable 72 to rotate, the turntable 72 causes one end of the connecting rod 73 to rotate. Since the hinge point between the connecting rod 73 and the turntable 72 moves in a circular motion, and the locking block 74 is restricted by the guide sleeve 34 to only slide horizontally, the tilt angle of the connecting rod 73 changes accordingly. Through geometric constraints, the rotational motion of the turntable 72 is converted into the horizontal linear motion of the locking block 74 until the end of the locking block 74 is inserted into the corresponding locking sleeve 51. During this process, the tilt angle of the connecting rod 73 gradually decreases, eventually approaching a horizontal state. Simultaneously, openings are made on the side walls corresponding to the lower mold 3 and the fixing assembly. The positioning groove 33 is provided. The fixing assembly also includes a perforated plate 75 fixed to the circumferential side wall of the turntable 72. A pin 76 is horizontally slidably arranged inside the perforated plate 75. When the end of the locking block 74 is inserted into the inside of the locking sleeve 51, the pin 76 rotates synchronously with the turntable 72, so that the axis of the pin 76 is on the same straight line as the axis of the positioning groove 33. When the worker inserts the end of the pin 76 into the inside of the positioning groove 33, the pin 76 restricts the turntable 72 from rotating around the axis of the rotating shaft 71, thereby fixing the end of the locking block 74 inside the locking sleeve 51. The limiting sleeve 5 is locked inside the mounting groove 32 by the locking block 74.

[0041] Meanwhile, two vertically arranged fitting grooves 321 are symmetrically opened on the inner wall of the mounting groove 32. Fitting blocks 52 are vertically fixed on both sides of the limiting sleeve 5 at positions corresponding to the fitting grooves 321. When the limiting sleeve 5 is located inside the mounting groove 32, the fitting blocks 52 are slidably arranged in the corresponding fitting grooves 321. The fitting blocks 52 and the fitting grooves 321 cooperate to restrict the position of the limiting sleeve 5 inside the mounting groove 32, thereby ensuring that the position of the locking sleeve 51 corresponds to the position of the locking block 74, so that the locking block 74 can be smoothly inserted into the interior of the corresponding locking sleeve 51, and preventing the limiting sleeve 5 from horizontally shifting and squeezing the slide rod 41 inside during the mold closing process, thereby ensuring the smooth movement of the slide rod 41 inside, and preventing the excessive friction between the slide rod 41 and the limiting sleeve 5 from affecting the reset of the moving plate 4 by the reset spring 6.

[0042] When replacing the return spring 6 in this mold, the worker rotates the shaft 71, causing the turntable 72 to move horizontally along the connecting rod 73 to the corresponding locking block 74 until the end of the locking block 74 moves out of the corresponding locking sleeve 51, releasing the locking mechanism 7 from locking the limiting sleeve 5. Then, the worker vertically removes the limiting sleeve 5 along the axis of the slide rod 41, and then pulls the old return spring 6 axially along the slide rod 41, so that the old return spring 6 passes through the circular groove 322, separating the old return spring 6 from the slide rod 41. Next, the new return spring 6 is inserted into the slide rod 41 from top to bottom, ensuring that the lower end of the new return spring 6 falls into the surface of the moving plate 4 through the circular groove 322. Finally, the limiting sleeve 5 is reinstalled into the mounting groove 32, and the shaft 71 is rotated in the opposite direction, causing the turntable 72 to drive the corresponding locking block 74 to insert into the inside of the locking sleeve 51 through the connecting rod 73, thus fixing the limiting sleeve 5 back into the mounting groove 32, completing the replacement of the return spring 6.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An injection molding ejector mold for a plastic part of a coffee machine, comprising a base (1), wherein two support plates (2) are symmetrically fixedly disposed on the upper sidewall of the base (1), and a lower mold (3) is fixedly disposed on the upper sidewall of the two support plates (2), wherein a molding cavity (31) is formed on the upper sidewall of the lower mold (3), and a movable plate (4) is disposed between the two support plates (2), wherein a plurality of ejector rods (42) are vertically fixed on the upper sidewall of the movable plate (4), wherein the upper end of the ejector rods (42) slides through the lower mold (3) and extends into the interior of the molding cavity (31), characterized in that: The lower mold (3) has four symmetrical mounting slots (32) on both sides of its upper sidewall. The bottom of the mounting slot (32) has a circular groove (322) that passes through the lower mold (3). The upper sidewall of the moving plate (4) is vertically fixed with a sliding rod (41) at the position corresponding to each circular groove (322). The upper end of the sliding rod (41) passes through the corresponding circular groove (322) and extends into the mounting slot (32). The mounting slot (32) is provided with a limiting sleeve (5) that slides on the sliding rod (41). A return spring (6) is provided between the limiting sleeve (5) and the moving plate (4) that is sleeved on the sliding rod (41). The upper end of the return spring (6) is located inside the circular groove (322), and the return spring (6) pushes the moving plate (4) away from the lower mold (3). The lower mold (3) is provided with a locking mechanism (7), which is used to fix the limiting sleeve (5) in the corresponding mounting slot (32).

2. The injection ejector mold for the plastic parts of the coffee machine according to claim 1, characterized in that: The limiting sleeve (5) is horizontally fixed with a locking sleeve (51) on the side away from the center of the lower mold (3). The locking mechanism (7) includes a rotating shaft (71) that horizontally passes through the lower mold (3) and rotates with it. The two ends of the rotating shaft (71) extend to the two sides of the lower mold (3) and are provided with fixing components. The fixing components are located in the area between the two locking sleeves (51).

3. The injection ejector mold for the plastic parts of the coffee machine according to claim 2, characterized in that: The fixing assembly includes a turntable (72) coaxially fixed on a rotating shaft (71). Two inclined connecting rods (73) are centrally hinged symmetrically on the circumferential sidewall of the turntable (72). The other end of the connecting rod (73) is hinged to a locking block (74) corresponding to the locking sleeve (51). A guide sleeve (34) horizontally fixed on the lower mold (3) is slidably sleeved on the locking block (74). When the locking block (74) moves away from the turntable (72) along the guide sleeve (34), the end of the locking block (74) is inserted into the corresponding locking sleeve (51).

4. The injection-moulding ejection mould for plastic parts of coffee machines according to claim 3, characterized in that: The lower mold (3) and the side wall corresponding to the fixing component are provided with positioning grooves (33). The fixing component also includes a hole plate (75) fixed to the circumferential side wall of the turntable (72). A pin (76) is horizontally slidably arranged inside the hole plate (75). When the end of the locking block (74) is inserted into the inside of the locking sleeve (51), the axis of the pin (76) is on the same straight line as the axis of the positioning groove (33). When the end of the pin (76) is inserted into the inside of the positioning groove (33), the pin (76) restricts the turntable (72) from rotating around the axis of the rotating shaft (71).

5. The injection ejector mold for the plastic parts of the coffee machine according to claim 1, characterized in that: The inner wall of the mounting groove (32) has two vertically arranged fitting grooves (321) symmetrically opened. The two sides of the limiting sleeve (5) are vertically fixed with fitting blocks (52) at positions corresponding to the fitting grooves (321). The fitting blocks (52) are slidably arranged in the corresponding fitting grooves (321).

6. The injection-molding ejection mold for plastic parts of a coffee maker according to claim 1, characterized in that: A through groove (11) is provided in the middle of the lower side wall of the base (1). Guide pins (12) are vertically fixed to the upper side wall of the base (1) on both sides of the through groove (11). The upper end of the guide pin (12) slides through the moving plate (4) and contacts the lower side wall of the lower mold (3).

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